TIA-EIA-IS 801 - 1999

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TIA/EIA

INTERIM STANDARD

Position Determination Service

Standard for Dual ModeSpread Spectrum Systems

TIA/EIA/IS-801

NOVEMBER 1999

TELECOMMUNICATIONS INDUSTRY ASSOCIATION

Representing the telecommunications industry in

association with the Electronic Industries Alliance

T I A / E I A / I S - 8 0 1

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NOTICE

TIA/EIA Engineering Standards and Publications are designed to serve the public interest through eliminating

misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of

products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for

his particular need. Existence of such Standards and Publications shall not in any respect preclude any

member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such

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Standards and Publications are adopted by TIA/EIA in accordance with the American National Standards

Institute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner,

nor does it assume any obligation whatever to parties adopting the Standard or Publication.

TIA/EIA INTERIM STANDARDS

TIA/EIA Interim Standards contain information deemed to be of technical value to the industry, and are

published at the request of the originating Committee without necessarily following the rigorous public review

and resolution of comments which is a procedural part of the development of a TIA/EIA Standard.

TIA/EIA Interim Standards should be reviewed on an annual basis by the formulating Committee and a

decision made on whether to proceed to develop a TIA/EIA Standard on this subject. TIA/EIA Interim

Standards must be cancelled by the Committee and removed from the TIA/EIA Standards Catalog before the

end of their third year of existence.

Publication of this TIA/EIA Interim Standard for trial use and comment has been approved by the

Telecommunications Industry Association. Distribution of this TIA/EIA Interim Standard for comment shall

not continue beyond 36 months from the date of publication. It is expected that following this 36 month

period, this TIA/EIA Interim Standard, revised as necessary, will be submitted to the American National

Standards Institute for approval as an American National Standard. Suggestions for revision should be

directed to: Standards & Technology Department, Telecommunications Industry Association, 2500 WilsonBoulevard, Arlington, VA 22201.

(From Project No. 4535, formulated under the cognizance of the TIA TR-45.5 Subcommittee on Spread

Spectrum Digital Technology.)

Published by

©TELECOMMUNICATIONS INDUSTRY ASSOCIATION 1999

Standards & Technology Department

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Arlington, VA 22201

PRICE: Please refer to current Catalog of

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CONTENTS

1 GENERAL ......................................................................................................................... 1-1

1.1 Terms ......................................................................................................................... 1-1

2 MESSAGE TRANSPORT PROTOCOL ................................................................................ 2-1

2.1 Analog Transport Protocol .......................................................................................... 2-1

2.2 CDMA Transport Protocol........................................................................................... 2-1

2.2.1 Session Tags ........................................................................................................ 2-1

3 MOBILE STATION PROCEDURES .................................................................................... 3-1

3.1 Analog Mobile Station Procedures .............................................................................. 3-1

3.2 CDMA Mobile Station Procedures...............................................................................3-1

3.2.1 Position Determination Data Message Processing ................................................ 3-1

3.2.1.1 Overview ........................................................................................................ 3-1

3.2.1.2 Requirements................................................................................................. 3-2

3.2.2 Point-to-point Procedures .................................................................................... 3-5

3.2.2.1 Control Channel Procedure............................................................................ 3-5

3.2.2.1.1 Mobile Position Message Termination...................................................... 3-5

3.2.2.1.1.1 Base Station Request Elements Received ..........................................3-5

3.2.2.1.1.2 Base Station Response Elements Received........................................ 3-9

3.2.2.1.2 Mobile Position Message Origination ....................................................... 3-9

3.2.2.1.2.1 Position Determination Data Message Transmission Requirements .. 3-9

3.2.2.1.2.2 Unsolicited Response Elements....................................................... 3-10

3.2.2.1.2.3 Request Elements ............................................................................ 3-10

3.2.2.2 Authentication Procedures........................................................................... 3-10

3.2.2.3 Traffic Channel Procedure ........................................................................... 3-11

3.2.2.3.1 Message Encryption............................................................................... 3-11

3.2.2.3.2 Negotiation for the Position Determination Service Option .................... 3-11

3.2.2.3.2.1 Procedures Using Service Negotiation..............................................3-11

3.2.2.3.3 Mobile Position Message Termination....................................................3-13

3.2.2.3.3.1 Base Station Request Elements Received ........................................ 3-13

3.2.2.3.3.2 Base Station Response Elements Received...................................... 3-17

3.2.2.3.4 Traffic Channel Setup............................................................................ 3-17

3.2.2.3.5 Mobile Position Message Origination in the Conversation Substate.......3-18

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CONTENTS

3.2.2.3.5.1 Position Determination Data Message Transmission Requirements 3-18



3.2.3 Broadcast Procedures ........................................................................................ 3-18

3.2.4 Reverse Link Message Format ............................................................................ 3-18

3.2.4.1 Request Element Parameters Record ...........................................................3-23

3.2.4.2 Response Element Parameters Record......................................................... 3-27

4 BASE STATION PROCEDURES ........................................................................................ 4-1

4.1 Analog Base Station Procedures................................................................................. 4-1

4.2 CDMA Base Station Procedures ................................................................................. 4-1

4.2.1 Position Determination Data Message Processing ................................................ 4-1

4.2.1.1 Overview ........................................................................................................ 4-1

4.2.1.2 Requirements................................................................................................. 4-2

4.2.2 Point-to-point Procedures .................................................................................... 4-4

4.2.2.1 Control Channel Procedure............................................................................ 4-4


4.2.2.1.1.1 Mobile Station Request Elements Received........................................ 4-4

4.2.2.1.1.2 Mobile Station Response Elements Received ..................................... 4-7

4.2.2.1.2 Mobile Position Message Termination...................................................... 4-7

4.2.2.1.2.1 Position Determination Data Message Transmission Requirements .. 4-7

4.2.2.1.2.2 Unsolicited Response Elements......................................................... 4-8

4.2.2.1.2.3 Request Elements .............................................................................. 4-8

4.2.2.2 Authentication Procedures............................................................................. 4-8

4.2.2.3 Traffic Channel Procedure .............................................................................4-8

4.2.2.3.1 Message Encryption................................................................................. 4-8

4.2.2.3.2 Negotiation for the Position Determination Service Option ......................4-8

4.2.2.3.2.1 Procedures Using Service Negotiation................................................4-9


4.2.2.3.3.1 Mobile Station Request Elements Received......................................4-10

4.2.2.3.3.2 Mobile Station Response Elements Received ...................................4-12

4.2.2.3.4 Traffic Channel Setup............................................................................ 4-12

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CONTENTS

4.2.2.3.5 Mobile Station Message Termination in the Conversation Substate ......4-12

4.2.2.3.5.1 Position Determination Data Message Transmission Requirements 4-12



4.2.3 Broadcast Procedures ........................................................................................ 4-13

4.2.4 Forward Link Message Format ........................................................................... 4-13

4.2.4.1 Request Element Parameters Record ...........................................................4-18

4.2.4.2 Response Element Parameters Record......................................................... 4-22

Annex A - TIMERS...............................................................................................................A-1

Annex B – REQUEST/RESPONSE ELEMENT TYPES ..........................................................B-1

Annex C – EXAMPLE POSITION DETERMINATION DATA MESSAGE..................................C-1

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TABLES

Table 3.2.1.2-1. Response Elements Sent in Response to Received Request Elements.....3-4

Table 3.2.2.3.2.1-1. Valid Service Configuration Attributes for Service Option 35..........3-12

Table 3.2.2.3.2.1-2. Valid Service Configuration Attributes for Service Option 36..........3-12

Table 3.2.4-1. Reverse Link Messages ............................................................................3-19

Table 3.2.4-2. Request Element Type .............................................................................3-22

Table 3.2.4-3. Response Element Type...........................................................................3-23

Table 3.2.4.2-1. Reject Reason .......................................................................................3-28

Table 3.2.4.2-2. Pilot Phase Capability...........................................................................3-29

Table 3.2.4.2-3. Mapping Table for GPS Acquisition Capability......................................3-29

Table 3.2.4.2-4. Mapping Table for Position Calculation Capability ...............................3-30

Table 3.2.4.2-5. Inverse of Weighting Factor Representation..........................................3-32

Table 3.2.4.2-6. Time Reference Source .........................................................................3-34

Table 3.2.4.2-7. Multipath Indicator...............................................................................3-36

Table 3.2.4.2-8. Pseudorange RMS Error Representation...............................................3-36

Table 3.2.4.2-9. RMS Error in Pilot Phase Measurement Representation.......................3-42

Table 3.2.4.2-10. Position Uncertainty ...........................................................................3-46

Table 4.2.1.2-1. Response Elements Sent in Response to Received Request Elements.....4-3

Table 4.2.4-1. Forward Link Messages ...........................................................................4-14

Table 4.2.4-2. Request Element Type .............................................................................4-17

Table 4.2.4-3. Response Element Type...........................................................................4-18

Table 4.2.4.2-1. Reject Reason .......................................................................................4-23

Table 4.2.4.2-2. Autonomous Location Determination Capability in the Base Station ...4-25

Table 4.2.4.2-3. Reference PN.........................................................................................4-27

Table 4.2.4.2-4. DOPPLER_WIN Parameter Format........................................................4-28

Table 4.2.4.2-5. Code Phase Search Window Parameter Format ....................................4-29

Table 4.2.4.2-6. Position Uncertainty .............................................................................4-54

Table A-1. Time Limits..................................................................................................... A-1

Table B-1. MS Requests and BS Responses .................................................................... B-1

Table B-2. MS Responses and BS Requests .................................................................... B-1

Table C-1. Bit Field of the Position Determination Data Message.................................... C-1

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FOREWORD

(This foreword is not part of this standard)

This Standard was prepared by Telecommunications Industry Association Subcommittee

TR45.5, Spread Spectrum Digital Technology - Mobile and Personal Communicat ions

Standards .

This standard is an adjunct standard to TIA/EIA-95-B, Mobile Station-Base Station

Compatibi l i ty Standard for Dual-Mode Spread Spectrum Systems or TIA/EIA/IS-2000-5,

Upper Lay er (Lay er 3) Signal ing Standa rd for cdm a20 00 Spread Spectrum Sys tems . This

standard defines a set of signaling messages between the mobile station and base station to

provide a position determination service.

This standard consists of the following sections:

1. General. This section defines the terms and numeric indications used in this document.

2 . Mes sage Transpo rt Proto col . This section defines the transport protocol used between

the mobile station and base station.

3. Mobile Station Procedures. This section describes the procedures used by the mobile

station to process messages received from the base station and to send messages to the

base station. This section also specifies the message formats for messages sent from the

mobile station to the base station.

4. Base Station Procedures. This section describes the procedures used by the base

station to process messages received from the mobile station and to send messages to the

mobile station. This section also specifies the message formats for messages sent from the

base station to the mobile station.

Ann ex A. This section provides values from various timers used in the standard.

Annex B. This section provides the summary tables of the request/response element

types.

Annex C. This section provides an example of the Posit ion Determin at ion Da ta Message .

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NOTES

1.

For purposes of this standard, “shall” and “shall not” identify requirements to be

followed strictly to conform to the standard, and from which no deviation is

permitted. “Should” and “should not” indicate that one of several possibilities is

recommended as particularly suitable, without mentioning or excluding others; that

a certain course of action is preferred, but not necessarily required; or (in negative

form) that a certain possibility or course of action is discouraged, but not

prohibited. “May” and “may not” indicate a course of action permissible within the

limits of this standard. “Can” and “cannot” are used for statements of possibility

and capability, whether material, physical or causal.

2. The terms “location” and “position” are used interchangeably throughout this

document. In this respect the definition of the term differs from the historic use of

location in wireless systems to identify the mobile’s current serving system.

3. Those wishing to deploy systems in the United States should also take notice of the

requirement to be compliant with Federal Communications Commission (FCC)

Rulings on 911 Emergency Services.

4. “Base station” refers to the functions performed on the land side, which are typically

distributed among a Base Station Transceiver (BTS), a Base Station Controller

(BSC), a Mobile Switching Center (MSC), Mobile Positioning Center (MPC), Position

Determination Entity (PDE) and any Inter-Working Function (IWF) required for

network connection. These elements are grouped together, because there is no need

to distinguish them in an air interface standard. See TSB-100 Wir eless Reference

Model and Enha nced Wireless 9-1-1 Phase 2 (to be released, currently PN-3890).

5. Footnotes appear at various points in this specification to elaborate and to further

clarify items discussed in the body of the specification.

6. Unless indicated otherwise, this document presents numbers in decimal form.

Binary numbers are distinguished in the text by the use of single quotation marks.

7. The following operators define mathematical operations:

× indicates multiplication.

x indicates the largest integer less than or equal to x: 1.1 = 1, 1.0 = 1.

x indicates the smallest integer greater or equal to x: 1.1 = 2, 2.0 = 2.

|x| indicates the absolute value of x: |-17|=17, |17|=17.

⊕ indicates exclusive OR (modulo-2 addition).

min (x, y) indicates the minimum of x and y.

max (x, y) indicates the maximum of x and y.

x mod y indicates the remainder after dividing x by y: x mod y = x - (y × x/y ).

8. References in this document are to TIA/EIA-95-B. This standard is equally

applicable to TIA/EIA/IS-2000. Except where explicit references are made to

TIA/EIA/IS-2000, the reference to TIA/EIA-95-B can be converted directly to

TIA/EIA/IS-2000 usage.

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9. Wherever this document refers to CDMA System time in frames, it is taken to mean

an integer value t such that: t = s/0.02, where s represents System Time in

seconds.

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REFERENCES

The following standards contain provisions which, through reference in this text, constitute

provisions of this standard. At the time of publication, the editions indicated were valid.

All standards are subject to revision, and parties to agreements based on this standard are

encouraged to investigate the possibility of applying the most recent editions of the

standards indicated below. ANSI and TIA maintain registers of currently valid national

standards published by them.

1.

TIA/EIA-95-B, Mobile Stat ion-Base Stat ion Compatibi l i ty Standard for Dual-Mode

Spread Spectrum Sy stems , March 1999.

2.

TIA/EIA/TSB58-B, Adm inistr at ion of Parameter Value Assignments for TIA/ EIA

Spread Spectrum Standard s , August 1999.

3. ICD-GPS-200C, Navsta r GPS Space Segment / Navigat ion User Interfaces , September

1997.

4.

DMA TR 8350.2, Defense Mapping Agency Publicat ion , September 30, 1987.

5. Enh an ced Wireless 9-1-1 Phase 2 . TR45.2 AHES. To be released. (Currently

PN-3890).

6. Beyond Enhanced Wireless 9-1-1 Phase 2 . TR45.2 AHES. To be released.

(Currently PN-4288).

7. Geo-Location Support on the Analog Air Interface . TR45.1.1.1. To be released.

(Currently PN-4662).

8.

TSB-100, Wireless Netw ork Reference Model , July 1998.

9.

TIA/EIA/IS-2000-1, Introduct ion to cdma2000 Standards for Spread Spectrum

System , July 1999.

10.

TIA/EIA/IS-2000-2, Medium Access Control (MAC) Stand ard s for cdma2 00 0 Spread

Spectrum Systems , July 1999.

11.

TIA/EIA/IS-2000-3, Signal ing Link Access Control (LAC) Standard for cdma2000

Spread Spectrum Sy stems , July 1999.

12. TIA/EIA/IS-2000-4, Upper Layer (Layer 3) Signal in g Stan da rd for cdma2 00 0 Spread


13. TIA/EIA/IS-2000-5, Upper Layer (Layer 3) Signal in g Stan da rd for cdma2 00 0 Spread


14. TIA/EIA/IS-2000-6, Analog Signal ing Standard for cdma2000 Spread Spectrum

Systems , July 1999.

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1 GENERAL

1 .1 Terms

2 D Fix. A two-dimensional (latitude and longitude) position determination process.

3D Fix. A three-dimensional (latitude, longitude and height) position determination

process.

Advanced Forward Link Trilateration (AFLT). A geolocation technique that utilizes the

mobile station’s measured time of arrival of radio signals from the base stations (and,

possibly, other terrestrial measurements).

AFLT. See Advanced Forward Link Trilateration.

Almanac. See GPS Almanac.

Alpha. See Alpha, Beta Parameters.

Alpha, Beta Parameters.Ionospheric parameters which allow the “L1 only” user to utilize

the ionospheric mode for computation of ionospheric delay are contained in page 18 of

subframe 4 of GPS navigation data.

Angle of Axis for Position Uncertainty. Position uncertainty is represented as a 1-σ (one

standard deviation) ellipse. This angle is the angle of one of the ellipse’s axes with respect

to True North.

Assistance Data. The assistance data provided by the base station to the mobile station

for various purposes (e.g., acquisition, location calculation or sensitivity improvement).

Authent icat ion. A procedure used by a base station to validate a mobile station’s identity.

Autonomous Mobile Station. A mobile station that is capable of detecting a navigation

signal without any help from the base station. The mobile station may be capable of

autonomously calculating its own position.

Autonomous Base Stat ion. A base station capable of determining the location of the

mobile station without requiring any cooperation from the mobile station.

Azimuth. An angle that specifies a direction in the horizontal plane, expressed in degrees

measured clockwise from True North.

Base Stat ion. The base station includes the transceiver equipment, Mobile Switching

Center (MSC), Mobile Positioning Center (MPC), Position Determination Entity (PDE) and

any Inter-Working Function (IWF) required for network connection.

Base Station Almanac. The location and reference time correction for a collection of base

stations in the immediate neighborhood of the mobile station (the size of the immediate

neighborhood is a service provider option).

Beta. See Alpha, Beta Parameters.

C/ A Code. Coarse/Acquisition code used for spectral spreading of the GPS signal.

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C/ A Code Chip. The interval defined by the chipping (spreading) rate of the GPS C/A code.

Stated as a time interval, one chip equals approximately 977.5 ns; as a distance it is

approximately 293.0 m.

C/ N0. The ratio of carrier signal power (C) to the power spectral density of background

noise (N0).

CDMA System Time. All base station digital transmissions are referenced to a common

CDMA system-wide time scale that uses the Global Positioning System (GPS) time scale,

which is traceable to and synchronous with Universal Coordinated Time (UTC). GPS and

UTC differ by an integer number of seconds, specifically the number of leap second

corrections added to UTC since January 6, 1980. The start of CDMA System Time is

January 6, 1980 00:00:00 UTC, which coincides with the start of GPS time. (See

TIA/EIA/95-B Section 1.2).

Clock Bias. The difference between the GPS System Time and the local time in the mobile

station.

Clock Drift. The rate of change of the clock bias.

Code Phase. At a given time, the code phase is the fraction of the code period that has

elapsed since the latest code boundary.

Code Phase Search Window. The expected range of possible code phase values.

DGPS. Differential GPS.

Doppler nth

Order. The nth

order moment specifying a satellite’s observed Doppler.

Doppler Se arch Window. The expected range of possible Doppler values.

ECEF. “Earth-Centered-Earth-Fixed”. A frame of reference for specifying positions that is

centered in the center of the Earth and rotates with it.

Elevation Angle. The angle between a (GPS) satellite and the horizon, expressed in

degrees.

Ephemeris. The ephemeris data embedded in the GPS signal. The precise (high accuracy)

orbital parameters of one GPS satellite, as transmitted by that satellite in GPS subframes 1,

2, and 3. The ephemeris also includes satellite clock correction.

Extended Base Station Almanac. The location and reference time correction for a

collection of base stations in the extended neighborhood of the mobile station (the size of

the extended neighborhood is a service provider option).

Fix. The process of performing position computation.

Frame. See GPS Navigation Message Frame.

Geolocation. The process of determining a geographic location.

GPS. Global Positioning System.

GPS Almanac. The almanac data embedded in the GPS signal. The almanac data are a

reduced-precision subset of the clock and ephemeris parameters for all satellites, as

transmitted by every satellite in GPS subframes 4 and 5.

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GPS Navigation Message Frame. A GPS navigation message frame contains five

subframes. Subframes 1 through 3 contain ephemeris information, subframes 4 and 5

contain message and almanac information.

GPS Navigation Message Subframe. One of the five GPS subframes of the GPS navigation

message. Subframe is 300-bits long.

GPS Navigation Message Superframe. A GPS navigation message superframe consists of

25 frames and has a duration of 12.5 minutes.

ICD. Interface Control Document.

IWF. InterWorking Function. A network entity enabling interactions between network

elements, such as interactions between an MSC and a landline function. The IWF usually

performs protocol conversions as its primary function.

Legacy Terminal. A mobile station that is not compliant with the messages defined in

this document.

Location. The terms “location” and “position” are used interchangeably throughout this

document. In this respect, the definition of the term differs from the historic use of location

in wireless systems to identify the mobile’s current serving system. See Position.

LSB. Least Significant Bit.

MPC. Mobile Positioning Center: The network entity that serves as the point of interface of

the wireless network for the exchange of geographic position information.

Mobile Station (MS). A station that communicates with the base station.

Mobile Station Originated Message. A message originating from a mobile station.

Mobile S tation Terminate d Message. A message received by a mobile station.

Mobile Switching Center (MSC). A configuration of equipment that provides cellular

radio-telephone service. Also called the Mobile Telephone Switching Office (MTSO).

ms. Millisecond (10-3 second).

MS. See Mobile Station.

MSB. Most Significant Bit.

MSC. See Mobile Switching Center.

Navigation Message Bits . The message bits (50 bits per second) transmitted by GPS

satellites, containing the satellite clock, ephemeris, almanac and other parameters.

ns . Nanosecond (10-9

second).

PDE. See Position Determination Entity.

PN Offset. The PN offset measured in units of 64 PN chips of a pilot, relative to the zero-

offset pilot PN sequence.

Posit ion. The geographic position of the mobile station expressed in latitude and

longitude.

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Posit ion Determination Entity (PDE). A network entity which manages the position or

geographic location determination of the mobile station.

ppb. Parts per billion.

Pseudodoppler. The measured Doppler frequency shift in the signal received from the GPS

satellite. Since the satellite and receiver clock drifts are included, it is referred to as

pseudodoppler.

Pseudorange. The measured range (in GPS chip) from the observed satellite to the GPS

receiver antenna. Since the satellite and receiver clock biases are included, it is referred to

as pseudorange.

Push. An unsolicited response.

Referenc e Bit Boun dary. A boundary between two 20-ms GPS bit intervals chosen as the

reference point for code phases.

Sensi t iv i ty . The minimum level (dBm) of received GPS signal at mobile station that allows

the determination of the geolocation of the mobile station.

Subframe. See GPS Navigation Message Subframe.

Superframe. See GPS Navigation Message Superframe.

SV. Space Vehicle; a way of referring to one of the GPS satellites; note SV will often be

used in this context as part of a message name, so the message is associated with a

satellite.

PRN Num ber. The GPS PRN signal number as defined in ICD-GPS-200C, table 3-I.

Time of Arrival. The time occurrence, as measured at the mobile station antenna

connector, of the earliest arriving usable multipath component of the signal.

Unsol ic i ted Response . A response element that is issued in the absence of the

corresponding request element.

Weighting Factor. Weighting factor is a weight applied to the GPS measurement as part of

a Weighted Least Squares Filter (WLSF) implementation of the navigation algorithm used by

the Mobile Station to compute its position.

WGS-84. World Geodetic System - 1984.

WGS-84 reference ellipsoid. Worldwide datum reference system defining the surface of

the Earth (note: Supersedes WGS-72), i.e., the standard physical model of the Earth used

for GPS applications. Ellipsoid reference models are location specific and may be obtained

from Defense Mapping Agency publication DMA TR 8350.2 (September 30, 1987).

WLSF. Weighted Least Squares Filter navigation algorithm.

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2 MESSAGE TRANSPORT PROTOCOL

Posit ion Determina t ion Data Messages (see 3 and 4) can be sent over the CDMA Traffic

Channel or the CDMA Control Channel. Posit ion Determin at ion Da ta Messages are sent

using a Layer-2 protocol that provides reliable delivery and duplicate detection.

2 .1 Analog Transport Protocol

The analog transport protocol is defined in [7].

2 .2

CDMA Transport Protocol

The message defined in 3.2.4 and 4.2.4 shall be sent in the CHARi fields of Data Burst

Messages (see 6.7.1.3.2.3, 6.7.2.3.2.4, 7.7.2.3.2.9 and 7.7.3.3.2.4 of TIA/EIA-95-B). The

BURST_TYPE field of Data B urst Messages carrying Posit ion Determin at ion Da ta Messa ges

shall be set to ‘000101’ (as assigned in TSB58-B). The MSG_NUMBER and NUM_MSGS

fields shall be set to 1 and the NUM_FIELDS fields shall be set to the number of octets in

the Posit ion Determin at ion Data Message. Data Burst Messages carrying Position

Determinat ion Data Message shall be sent as messages requiring Layer-2 acknowledgement

(see 6.6.4.1.3.1 and 7.6.4.1.3.1 of TIA/EIA-95-B).

2.2.1 Session Tags

The first CHARi field of each Data Burst Message of BURST_TYPE ‘000101’ is intended to

identify groups of Posit ion Determ inat ion Data Messages that are related to one another.

The purpose is to assist the network in routing the data to the proper destination.

Two Posit ion Determin at ion Da ta Messages are defined to be related, and the elements or

parts of elements they contain are defined to be related if any of the following is true.

•

One Posit ion Determina t ion Data Message contains a request element and the other

Posit ion Determin at ion Da ta Message contains the associated response element or

part of the associated response element.

• One Posit ion Determin at ion Data Message contains part of a response element and

the other Posit ion Determina t ion Data Message contains another part of the same

response element.1

• The sending entity (mobile station or base station) of a Posit ion Determinat ion Da ta

Message had previously received or previously sent another Position Determination

Data Message , and the two Posit ion Determin at ion Data Message s contain elements

that are related. The criteria for determining if a relation exists are defined by the

sending entity in an implementation-dependent fashion.

The structure of the first CHARi field is detailed in 3.2.4 and 4.2.4. It includes a session

tag (SESS_TAG) and three flags. Procedures for assigning a value to SESS_TAG are also

detailed in 3.2.4 and 4.2.4.

1 This definition covers unsolicited responses that are divided into several parts in different

messages.

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All request elements, response elements, and parts of response elements that are related

should, if possible, be included in the same Posit ion Determin at ion Da ta Messa ge. A

Posit ion Determinat ion Data Message shall only include request elements, response

elements, or parts of response elements that are mutually related.

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3 MOBILE STATION PROCEDURES

3 .1 Analog Mobile Station Procedures

The analog mobile station procedures are defined in [7].

3 .2 CDMA Mobile S tatio n Proc edures

3.2.1

Position Determination Data Message Processing

3.2.1.1

Overview

The Posit ion Determina t ion Data Message sent by the mobile station is comprised of request

elements and response elements, as specified below.

Request elements sent by mobile station:

• Request BS Capabilities

•

Request GPS Acquisition Assistance

•

Request GPS Location Assistance

•

Request GPS Sensitivity Assistance

• Request Base Station Almanac

• Request GPS Almanac

•

Request GPS Ephemeris

• Request GPS Navigation Message Bits

• Request Location Response

• Request GPS Almanac Correction

Response elements sent by mobile station:

• Reject

• Provide MS Information

• Provide Autonomous Measurement Weighting Factors

• Provide Pseudorange Measurement

• Provide Pilot Phase Measurement

•

Provide Location Response

• Provide Time Offset Measurement

• Provide Cancellation Acknowledgement

The Posit ion Determina t ion Data Message received by the mobile station is also comprised of

request elements and response elements, as specified below.

Request elements received by mobile station:

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• Request MS Information

• Request Autonomous Measurement Weighting Factors

• Request Pseudorange Measurement

• Request Pilot Phase Measurement

•

Request Location Response

• Request Time Offset Measurement

• Request Cancellation

Response elements received by mobile station:

•

Reject

• Provide BS Capabilities

• Provide GPS Acquisition Assistance

•

Provide GPS Location Assistance – Spherical Coordinates

• Provide GPS Location Assistance – Cartesian Coordinates

• Provide GPS Sensitivity Assistance

• Provide Base Station Almanac

•

Provide GPS Almanac

• Provide GPS Ephemeris

• Provide GPS Navigation Message Bits

•


•

Provide GPS Almanac Correction

Response elements sent by the mobile station may be generated in response to request

elements received by the mobile station or they may be generated as unsolicited response

elements. Every request element includes a REQ_TYPE (request element type) field that

uniquely identifies the request element (See Table 3.2.4-2). Every response element

includes a RESP_TYPE (response element type) field that uniquely identifies the response

element (See Table 3.2.4-3). Multiple response elements may be associated with a single

request element. Unsolicited response elements are sent with the UNSOL_RESP flag set to

‘1’ (see 3.2.4).

3.2.1.2 Requirements

Each Posit ion Determina t ion Data M essage shall contain at least one request element, or at

least one part of a response element, or both. No more than one request element of a

specific REQ_TYPE shall be included in a Posit ion Determina t ion Data Message . Each

request element shall be fully contained in a Posit ion Determina t ion Data Message . Some

response elements may be divided into parts (see 3.2.4.2). Each response element part

shall be fully contained in a Posit ion Determinat ion Data Message . All Position

Determina t ion Data Messages shall be no larger than 200 bytes.

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If the mobile station sends a response element in response to a received request element, it

shall comply with Table 3.2.1.2-1. A “Reject” shall not be sent as a response element to a

“Request MS Information” request element. A “Reject” shall not be sent as a response

element to a “Request Cancellation” request element.

If one or more response elements from the mobile station can be useful to the base station

in responding to a request from the mobile station, the mobile station should include all or

part of each response element and the request element in the same Posit ion Determinat ion

Data Message .

Upon receiving a Posit ion Determ inat ion Da ta Message , the mobile station should examine

the received response elements prior to processing the request elements.2

2 Consider, for example, the case in which a base station asks a mobile station for a

location fix while, at the same time, providing acquisition assistance that is needed to

achieve the fix. In that case, the base station would issue a Posit ion Determin at ion Da ta

Message containing both the request for a location fix (Request Location Response

message) and an unsolicited response with the acquisition assistance (Provide GPS

Acquisition Assistance message). Sending a message with both the request and response

avoids the additional exchange of messages that would otherwise occur if the mobile station

had to issue a request for acquisition assistance and wait for the response. However, for

this example to work correctly, the mobile station must be aware that the acquisition

assistance is available when it processes the request for a fix; hence, the recommendation

that response elements should be “examined” prior to processing the request elements.

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Table 3 .2 .1 .2 -1 . Response Eleme nts Sen t in Response to Received Request Elemen ts

Reques t e lem e n t re ce ive d Pos s ible res pon s e e lem en ts

Request MS Information Provide MS Information

Reject Request Autonomous Measurement

Weighting Factors Provide Autonomous Measurement

Weighting Factors

Reject Request Pseudorange Measurement

Provide Pseudorange Measurement

Reject Request Pilot Phase Measurement

Provide Pilot Phase Measurement

Reject Request Location Response


Reject Request Time Offset Measurement

Provide Time Offset Measurement

Request Cancellation Provide Cancellation

Acknowledgement

No more than one request element shall be outstanding at any given time for each

REQ_TYPE. If an additional request element is received while there is an outstanding

request element of the same type, the additional request element shall be discarded. A

received request element is considered outstanding until all of the corresponding response

elements or a “Reject” have been sent or until a “Request Cancellation” for the request

element has been received. The mobile station should wait T 9 (see ANNEX A) seconds for a

response or a “Reject” to a sent request element; after T 9 seconds the request element

should no longer be considered outstanding. Unsolicited response elements shall have the

UNSOL_RESP flag set to ‘1’. If the mobile station while in the Mobile Stat ion Idle State

performs an idle handoff (see section 6.6.2.1.4 of TIA/EIA-95B) to a base station with

different SID/NID, it shall discard all of the outstanding request elements. If the mobile

station switches from an analog system to a CDMA system or switches from a CDMA

system to an analog system, the mobile station shall discard all of the outstanding request

elements. If the mobile station, while in the Mobile Stat ion Conversat ion Substate of Mobile

Stat ion Control on the Traff ic Chan nel State, performs a handoff (see section 6.6.6.2.9 of

TIA/EIA-95B) to an analog system, the mobile station shall discard all of the outstanding

request elements.

If a “Reject” constitutes the response element, its REJ_REQ_TYPE shall be set to the

REQ_TYPE of the corresponding request element.

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3.2.2 Point-to-point Procedures

This section defines the procedures for the processing of mobile-terminated Position

Determina t ion Data Messages that are addressed to individual mobile stations and for the

processing of all mobile-originated Posit ion Determ inat ion Data Messages .

3.2.2.1

Control Channel Procedure

3.2.2.1.1 Mobile Position Message Termination

A mobile station supporting Position Determination shall accept and shall process Data

Burst Messages received while the mobile station is monitoring the CDMA Paging Channel

(see 7.7.2.3.2.9 of TIA/EIA-95-B) that are addressed to the mobile station. Processing of

TIA/EIA-95-B Layer-2 fields shall be in accordance with TIA/EIA-95-B. Data Burst

Messages used to transport Position Determination request and response elements shall

always be acknowledged (Layer 2) and the in-order delivery over the air interface shall be

guaranteed by the transmitting entities: Mobile station and base station.

The mobile station shall process all Data Burst Messages addressed to the mobile station

on the Paging Channel and having the BURST_TYPE field set to ‘000101’ (as assigned in

TSB58-B). The mobile station shall discard the message without further processing if one

or more of the following is true:

• MSG_NUMBER field is set to a value other than 1.

• NUM_MSGS field is set to a value other than 1.

• NUM_FIELDS field is set to zero.

Otherwise, the mobile station shall process the Position Determination Data contained in

the CHARi fields of the received Data Burst Message (see 7.7.2.3.2.9 of TIA/EIA-95-B), as

described below.

3.2.2.1.1.1 Base Station Request Elements Received

If the mobile station does not support the requested capability, the mobile station shall

respond with a “Reject” response element with the appropriate reject reason (see Table

3.2.4.2-1), unless the base station request element is “Request MS Information” or “Request

Cancellation” (these request elements cannot be rejected); otherwise, the mobile station

shall include the appropriate response elements in the response Position Determination

Data (see 3.2.4) as described below. The response Position Determination Data shall reside

in the CHARi field of the response Data Bur st Message (see 6.7.1.3.2.3 of TIA/EIA-95-B).3

•

Request MS Information: The mobile station shall include the “Provide MS

Information” response element in the response Position Determination Data. The

response Posit ion Determin at ion Data Message shall be sent within 750 ms of the

reception of the “Request MS Information”.

3 The parameters discussed in this subsection are defined in 4.2.4.1.

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• Request Autonomous Measurement Weight ing Factors: The mobile station shall

include the “Provide Autonomous Measurement Weighting Factors” response

element in the response Position Determination Data. The PREF_RESP_QUAL

indicator provided in the “Request Location Response” shall also apply to the

“Request Autonomous Measurement Weighting Factors” request element.

•

Request Pseud orange Meas urement: The mobile station shall send one or more

“Provide Pseudorange Measurement” response elements, according to that which is

specified by NUM_FIXES (Number of Fixes) and T_BETW_FIXES (Time between

Fixes) included in the “Request Pseudorange Measurement”. The mobile station

shall include the “Provide Pseudorange Measurement” response element in one or

more response Posit ion Determin at ion Data Messages , according to the number of

parts into which the response element is divided. The mobile station should use the

mobile station time reference as defined in TIA/EIA-95 as the time reference used to

perform the pseudorange measurements.4 If the mobile station is unable to use the

mobile station time reference, as defined in TIA/EIA-95, to measure the

pseudoranges, then the mobile station shall use an alternate time reference to

perform the pseudorange measurements. The mobile station shall set the

TIME_REF_SRC field in the “Provide Pseudorange Measurement” response element

to the appropriate value to indicate the source of the time reference used to perform

the pseudorange measurements. The mobile station shall set the periodic rate of

measurement collection equal to the value of T_BETW_FIXES.

If PREF_RESP_QUAL is set to ‘000’, the “Provide Pseudorange Measurement”

response element shall be sent within T 1 seconds of the time corresponding

to the beginning of the measurement collection period; if PREF_RESP_QUAL

is set to ‘001’, the “Provide Pseudorange Measurement” response element

shall be sent within T 2 seconds of the time corresponding to the beginning of

the measurement collection period; if PREF_RESP_QUAL is set to ‘010’, the

“Provide Pseudorange Measurement” response element shall be sent within

T 3 seconds of the time corresponding to the beginning of the measurement

collection period; if PREF_RESP_QUAL is set to ‘011’, the “Provide

Pseudorange Measurement” response element shall be sent within T 4

seconds of the time corresponding to the beginning of the measurement










4 The time reference used to perform the pseudorange measurements should be initialized

from the mobile station time reference as defined in TIA/EIA-95.

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collection period.

If OFFSET_REQ is set to ‘1’, the “Provide Pseudorange Measurement”

response element shall include REF_PN and MOB_SYS_T_OFFSET;

otherwise the “Provide Pseudorange Measurement” response element should

not include REF_PN and MOB_SYS_T_OFFSET.

• Request Pilot Phase Measurement: The mobile station shall send one or more

“Provide Pilot Phase Measurement” response elements, according to that which is


Fixes) included in the “Request Pilot Phase Measurement”. The mobile station shall

include the “Provide Pilot Phase Measurement” response element in one or more

response Posit ion Determin at ion Da ta Messages according to the number of parts

into which the response element is divided. The mobile station shall set the periodic

rate of measurement collection equal to the value of T_BETW_FIXES.

If PREF_RESP_QUAL is set to ‘000’, the “Provide Pilot Phase Measurement”



is set to ‘001’, the “Provide Pilot Phase Measurement” response element shall

be sent within T 2 seconds of the time corresponding to the beginning of the

measurement collection period; if PREF_RESP_QUAL is set to ‘010’, the

“Provide Pilot Phase Measurement” response element shall be sent within T 3


collection period; if PREF_RESP_QUAL is set to ‘011’, the “Provide Pilot

Phase Measurement” response element shall be sent within T 4 seconds of the

time corresponding to the beginning of the measurement collection period; if

PREF_RESP_QUAL is set to ‘100’, the “Provide Pilot Phase Measurement”










time corresponding to the beginning of the measurement collection period.

If DESI_PIL_PH_RES is set to ‘1’, the "Provide Pilot Phase Measurement”

response element shall5 be of at least 1/8 of TIA/EIA-95 PN chip resolution ;

5 If the mobile station rejects the request with 1/8 chip resolution, it may send an

unsolicited response (see 3.2.1.1) with 1 chip resolution.

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otherwise, the “Provide Pilot Phase Measurement” response element shall be

of at least 1 TIA/EIA-95 PN chip resolution.

If OFFSET_REQ is set to ‘1’, the “Provide Pilot Phase Measurement” response

element shall include MOB_SYS_T_OFFSET; otherwise the “Provide Pilot

Phase Measurement” response element should not include

MOB_SYS_T_OFFSET.

• Request Location Response : The mobile station shall send one or more “Provide

Location Response” response elements, according to that which is specified by

NUM_FIXES (Number of Fixes) and T_BETW_FIXES (Time between Fixes) included

in the “Request Location Response”. The mobile station shall include the “Provide

Location Response” response element in one or more response Position

Determinat ion Data Messages according to the number of parts into which the

response element is divided. The mobile station shall set the periodic rate of


If PREF_RESP_QUAL is set to ‘000’, the “Provide Location Response”



is set to ‘001’, the “Provide Location Response” response element shall be

sent within T 2 seconds of the time corresponding to the beginning of the


“Provide Location Response” response element shall be sent within T 3


collection period; if PREF_RESP_QUAL is set to ‘011’, the “Provide Location

Response” response element shall be sent within T 4 seconds of the time

corresponding to the beginning of the measurement collection period; if

PREF_RESP_QUAL is set to ‘100’, the “Provide Location Response” response

element shall be sent within T 5 seconds of the time corresponding to the

beginning of the measurement collection period; if PREF_RESP_QUAL is set

to ‘101’, the “Provide Location Response” response element shall be sent

within T 6 seconds of the time corresponding to the beginning of the






corresponding to the beginning of the measurement collection period.

If HEIGHT_REQ is set to ‘1’, the “Provide Location Response” response

element should include height information; otherwise, the “Provide Location

Response” response element should not include height information.

If CLK_COR_GPS_REQ is set to ‘1’, the “Provide Location Response” response

element should include clock correction for GPS time; otherwise, the “Provide

Location Response” response element should not include clock correction for

GPS time.

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If VELOCITY_REQ is set to ‘1’, the “Provide Location Response” response

element should include velocity information; otherwise, the “Provide Location

Response” response element should not include velocity information.

• Request Time Offset Measu rement: The mobile station shall include a “Provide Time

Offset Measurement” response element in the response Position Determination

Data. If USE_TIME is set to ‘1’, the “Provide Time Offset Measurement” response

element shall include the offset information determined to be valid at the

ACTION_TIME. If USE_TIME is set to ‘0’, the “Provide Time Offset Measurement”

response element shall include the offset information determined to be valid at the

time the “Request Time Offset Measurement” is received by the mobile station. If

USE_TIME is set to ‘1’, the “Provide Time Offset Measurement” response element

shall be sent within 750 ms of ACTION_TIME. If USE_TIME is set to ‘0’, the “Provide

Time Offset Measurement” response element shall be sent within 750 ms of the

reception of the “Request Time Offset Measurement” request element.

• Request Cancellation : The mobile station shall cancel the outstanding request

element indicated by CANCEL_TYPE. The mobile station shall include a “Provide

Cancellation Acknowledgement” response element in the Posit ion Determin at ion Da ta

Message to indicate the successful cancellation of the outstanding request element.

If the mobile station has no outstanding request element of the type indicated by

CANCEL_TYPE, it shall set the NO_OUT_REQ flag in the “Provide Cancellation

Acknowledgment” response element. The “Provide Cancellation Acknowledgement”

response element shall be sent within 750 ms of the reception of the “Request

Cancellation” request element.

3.2.2.1.1.2 Base Station Response Elements Received

The mobile station should process and should make use of base station response elements.

Upon receiving a Posit ion Determin at ion Da ta Message , the mobile station should examine

the received response elements prior to processing the request elements.

If the mobile station receives “Provide GPS Almanac Correction” response element, the

mobile station shall process the response element as follows.

• If DELTA_XYZ_INCL is ‘0’, the mobile station shall set the values of DELTA_X,

DELTA_Y, DELTA_Z, DELTA_X_1ST, DELTA_Y_1ST and DELTA_Z_1ST to 0.

• If DELTA_CLOCK_INCL is ‘0’, the mobile station shall set the values of

DELTA_CLOCK and DELTA_CLOCK_1ST to 0.

3.2.2.1.2

Mobile Position Message Origination

3.2.2.1.2.1 Position Determination Data Message Transmission Requirements

Mobile stations supporting Position Determination shall support the Mobile Stat ion Message

Tran smission Operat ion , as defined in 6.6.2.6 of TIA/EIA-95-B.

When the mobile station is in the TIA/EIA-95-B Mobile Stat ion Idle State and needs to send

one (or more) Posit ion Determin at ion Da ta M essage(s) , the mobile station shall determine

whether the Posit ion Determin at ion Da ta Message(s) is (are) suitable for transmission on the

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Access Channel6. As part of this determination, the mobile station shall determine whether

the length of the Position Determin ati on Data Messa ge(s) is such that the message(s) can be

sent on the Access Channel. If the Posit ion Determin at ion Data Message(s) is (are) not

suitable for the Access Channel, the mobile station shall send the Posit ion Determi nat ion

Data Message(s) on the CDMA Traffic Channel, following the procedures defined in 3.2.2.3.

If the Position Determination Data Message(s) is (are) suitable to be sent on the Access

Channel, the mobile station may form one (or more) Data B urst Messa ge(s) (see 6.7.1.3.2.3

of TIA/EIA-95-B), setting BURST_TYPE to ‘000101’, and send it (them) on the Access

Channel, following the procedure specified in 6.6.2.6 and 6.6.3 of TIA/EIA-95-B. The

mobile station shall set NUM_FIELDS field to the number of octets in the Position

Determinat ion Data Message (see 3.2.4). The mobile station address fields shall be set

using the address parameter stored in the mobile station. The authentication fields shall

be set, as described in 3.2.2.2, using the authentication parameter stored in the mobile

station. The Data Bu rst Message contains the Position Determination Data in the CHARi

fields (see 6.7.1.3.2.3 of TIA/EIA-95-B). The mobile station shall wait for an appropriate

response from the base station in accordance with the mobile station request elements.

When the mobile station is in the TIA/EIA-95-B System Access State , the mobile station

shall wait until it exits the Syst em Access Stat e. If the mobile station enters the Mobile

Station Idle State, the mobile station shall follow the procedures specified in the above

paragraph. If the mobile station enters the Mobile Stat ion Control on Traff ic Cha nnel State ,

the mobile station shall follow the procedures defined in 3.2.2.3. If the mobile station

enters an analog mode task, the mobile station shall follow the procedures for a mobile

station in analog mode (see 3.1).

Posit ion Determinat ion Data Messages sent on the Access Channel always require a

TIA/EIA-95-B Layer-2 acknowledgement and the in-order delivery over the air interface

shall be guaranteed by the mobile station.

3.2.2.1.2.2 Unsolicited Response Elements

Reserved

3.2.2.1.2.3

Request Elements

Reserved

3.2.2.2 Authentication Procedures

When sending a Data Bu rst Message on the Access Channel, the mobile station shall use

the authentication procedures defined in 6.3.12 of TIA/EIA-95-B. The authentication

parameter shall consist of six 4-bit digits, encoded according to TIA/EIA-95-B Table

6.7.1.3.2.4-4. The digits shall be generated from the first three CHARi fields of the Data

Burst Message .

6 The criteria for suitability are implementation dependent.

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The sequence of digits in the authentication parameter shall be used to compute the

authentication fields of the Data Bur st Message in accordance with 6.3.12.1.8 of TIA/EIA-

95-B.

3.2.2.3 Traffic Channel Procedure

3.2.2.3.1

Message Encryption

To enhance the security of the position determination session and to protect sensitive

subscriber location information, Posit ion Determinat ion Data Messages on the Traffic

Channel should be encrypted as deemed appropriate. Encryption of the Forward and

Reverse CDMA Traffic Channel messages is defined in 6.3.12.2 of TIA/EIA-95-B and Annex

A of TIA/EIA-95-B.

3.2.2.3.2 Negotiation for the Position Determination Service Option

Negotiation for the Position Determination Service Option is only required when no other

service option is connected.

The Position Determination Service Option described by this standard shall use service

option number 35 and is called Service Option 35 when using Multiplex Option 1. The

Position Determination Service Option shall use service option number 36 and is called

Service Option 36 when using Multiplex Option 2.

The mobile station shall negotiate for Service Option 35 using service negotiation (see

3.2.2.3.2.1).

The mobile station shall negotiate for Service Option 36 using service negotiation (see

3.2.2.3.2.1).

3.2.2.3.2.1 Procedures Using Service Negotiation

The mobile station shall perform service negotiation for Service Option 35 or Service Option

36 as described in TIA/EIA-95-B. The negotiated service configuration shall include only

valid attributes for the negotiated service option consistent with those specified in Table

3.2.2.3.2.1-1 and Table 3.2.2.3.2.1-2.

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Table 3 .2.2 .3.2 .1-1. Valid Service Configuration Attributes for Service Option 3 5

S e rv ic e Co n fig ura ti on At t ribu t e Valid S e le c t io n s

Forward Multiplex Option Multiplex Option 1

Reverse Multiplex Option Multiplex Option 1

Forward Transmission Rates Rate Set 1 with all four rates enabled

Reverse Transmission Rates Rate Set 1 with all four rates enabled

Forward Traffic Type None. This service option does not use nor

generate any forward traffic other than signaling.

Reverse Traffic Type None. This service option does not use nor

generate any reverse traffic other than signaling.

Table 3 .2.2 .3.2 .1-2. Valid Service Configuration Attributes for Service Option 3 6

S e rv ic e Co n fig ura ti on At t ribu t e Valid S e le c t io n s

Forward Multiplex Option Multiplex Option 2

Reverse Multiplex Option Multiplex Option 2

Forward Transmission Rates Rate Set 2 with all four rates enabled

Reverse Transmission Rates Rate Set 2 with all four rates enabled

Forward Traffic Type None. This service option does not use nor

generate any forward traffic other than signaling.

Reverse Traffic Type None. This service option does not use nor

generate any reverse traffic other than signaling.

If the mobile station accepts a service configuration, as specified in a Service Connect

Message , that includes a service option connection using Service Option 35 or Service

Option 36, then the service option connection shall become part of the current service

configuration at the action time associated with the Service Connect Message . Service

Option 35 or Service Option 36 is considered to be connected when the current service

configuration includes a service option connection for it.

If Service Option 35 or Service Option 36 is connected when the mobile station enters the

Wait in g for Mobile Stat ion Answ er Subs tate , or Service Option 35 or Service Option 36

becomes connected while the mobile station is in the Wait in g for Mobile Stat ion Answ er

Substate , the mobile station shall send a Connect Order to the base station as a message

requiring acknowledgment without waiting for the user to explicitly command the call to be

answered. The mobile station shall enter the Conversat ion Substate.

The mobile station shall not send a Service Option Control Message for Service Option 35 or

Service Option 36. The mobile station shall send a Mobile Station Reject Ord er (ORDQ =

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‘00000001’, unspecified reason), if it receives a Service Option Contr ol Message for Service

Option 35 or Service Option 36 from the base station.


A mobile station supporting Position Determination shall accept and shall process Data

Burst Messages received on the CDMA Forward Traffic Channel (see 7.7.2.3.2.9 of

TIA/EIA-95-B). Processing of TIA/EIA-95-B Layer-2 fields shall be in accordance with

TIA/EIA-95-B. Data Burst Messages used to transport Position Determination request and

response elements shall always be acknowledged (Layer 2) and the in-order delivery over

the air interface shall be guaranteed by the transmitting entities: Mobile station and base

station.

The mobile station shall process all Data Burst Messages addressed to the mobile station

on the Forward Traffic Channel and having the BURST_TYPE field set to ‘000101’ (as

assigned in TSB58-B). The mobile station shall discard the message without further

processing if one or more of the following is true:

•

MSG_NUMBER field is set to a value other than 1.



Otherwise, the mobile station shall process the Position Determination Data contained in

the CHARi fields of the received Data Bu rst Message (see 7.7.3.3.2.4 of TIA/EIA-95-B), as

described below.

3.2.2.3.3.1 Base Station Request Elements Received

If the mobile station is unable to respond with the requested information, the mobile

station shall respond with a “Reject” response element with the appropriate reject reason,

unless the base station request element is “Request MS Information” or “Request

Cancellation” (these request elements cannot be rejected); otherwise, the mobile station

shall include the appropriate response elements in the response Position Determination

Data (see 3.2.4) as described below. The response Position Determination Data shall reside

in the CHARi fields of the response Data Bu rst Message (see 6.7.2.3.2.4 of TIA/EIA-95-B).7

• Request MS Information: The mobile station shall include the “Provide MS

Information” response element in the response Position Determination Data. The

response Posit ion Determin at ion Data Message shall be sent within 750 ms of the

reception of the “Request MS Information”.

•

Request Autonomous Measurement Weight ing Factors: The mobile station shall

include the “Provide Autonomous Measurement Weighting Factors” response

element in the response Position Determination Data. The PREF_RESP_QUAL

indicator provided in the “Request Location Response” shall also apply to the

“Request Autonomous Measurement Weighting Factors” request element.


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• Request Pseud orange Meas urement: The mobile station shall send one or more

“Provide Pseudorange Measurement” response elements, according to that which is


Fixes) included in the “Request Pseudorange Measurement”. The mobile station

shall include the “Provide Pseudorange Measurement” response element in one or

more response Posit ion Determin at ion Data Messages according to the number of

parts into which the response element is divided. The mobile station should use the

mobile station time reference as defined in TIA/EIA-95 as the time reference used to

perform the pseudorange measurements.8 If the mobile station is unable to use the

mobile station time reference as defined in TIA/EIA-95 to measure the

pseudoranges, then the mobile station shall use an alternate time reference to

perform the pseudorange measurements. The mobile station shall set the

TIME_REF_SRC field in the “Provide Pseudorange Measurement” response element

to the appropriate value to indicate the source of the time reference used to perform

the pseudorange measurements. The mobile station shall set the periodic rate of


If PREF_RESP_QUAL is set to ‘000’, the “Provide Pseudorange Measurement”



is set to ‘001’, the “Provide Pseudorange Measurement” response element

shall be sent within T 2 seconds of the time corresponding to the beginning of

the measurement collection period; if PREF_RESP_QUAL is set to ‘010’, the

“Provide Pseudorange Measurement” response element shall be sent within

T 3 seconds of the time corresponding to the beginning of the measurement
















collection period.

8 The time reference used to perform the pseudorange measurements should be initialized

from the mobile station time reference as defined in TIA/EIA-95.

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If OFFSET_REQ is set to ‘1’, the “Provide Pseudorange Measurement”

response element shall include REF_PN and MOB_SYS_T_OFFSET;

otherwise the “Provide Pseudorange Measurement” response element should

not include REF_PN and MOB_SYS_T_OFFSET.

• Request Pilot Phase Measurement: The mobile station shall send one or more

“Provide Pilot Phase Measurement” response elements, according to that which is


Fixes) included in the “Request Pilot Phase Measurement”. The mobile station shall

include the “Provide Pilot Phase Measurement” response element in one or more

response Posit ion Determin at ion Da ta Messages according to the number of parts

into which the response element is divided. The mobile station shall set the periodic

rate of measurement collection equal to the value of T_BETW_FIXES.

If PREF_RESP_QUAL is set to ‘000’, the “Provide Pilot Phase Measurement”










time corresponding to the beginning of the measurement collection period; if

PREF_RESP_QUAL is set to ‘100’, the “Provide Pilot Phase Measurement”










time corresponding to the beginning of the measurement collection period.

If DESI_PIL_PH_RES is set to ‘1’, the “Provide Pilot Phase Measurement”

response element shall9 be of at least 1/8 of TIA/EIA-95 PN chip resolution ;

otherwise, the “Provide Pilot Phase Measurement” response element shall be

of at least 1 TIA/EIA-95 PN chip resolution.

If OFFSET_REQ is set to ‘1’, the “Provide Pilot Phase Measurement” response

element shall include MOB_SYS_T_OFFSET; otherwise the “Provide Pilot

9 If the mobile station rejects the request with 1/8 chip resolution, it may send an

unsolicited response (see 3.2.1.1) with 1 chip resolution.

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Phase Measurement” response element should not include

MOB_SYS_T_OFFSET.

• Request Location Response : The mobile station shall send one or more “Provide

Location Response” response elements, according to that which is specified by

NUM_FIXES (Number of Fixes) and T_BETW_FIXES (Time between Fixes) included

in the “Request Location Response”. The mobile station shall include the “Provide

Location Response” response element in one or more response Position

Determinat ion Data Messages according to the number of parts into which the

response element is divided. The mobile station shall set the periodic rate of


If PREF_RESP_QUAL is set to ‘000’, the “Provide Location Response”



is set to ‘001’, the “Provide Location Response” response element shall be

sent within T 2 seconds of the time corresponding to the beginning of the






corresponding to the beginning of the measurement collection period; if

PREF_RESP_QUAL is set to ‘100’, the “Provide Location Response” response

element shall be sent within T 5 seconds of the time corresponding to the

beginning of the measurement collection period; if PREF_RESP_QUAL is set

to ‘101’, the “Provide Location Response” response element shall be sent

within T 6 seconds of the time corresponding to the beginning of the






corresponding to the beginning of the measurement collection period.



Response” response element should not include height information.


element should include clock correction for GPS time; otherwise, the “Provide

Location Response” response element should not include clock correction for

GPS time.




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• Request Time Offset Measu rement: The mobile station shall include a “Provide Time

Offset Measurement” response element in the response Position Determination

Data. If USE_TIME is set to ‘1’, the “Provide Time Offset Measurement” response

element shall include the offset information determined to be valid at the

ACTION_TIME. If USE_TIME is set to ‘0’, the “Provide Time Offset Measurement”

response element shall include the offset information determined to be valid at the

time the “Request Time Offset Measurement” is received by the mobile station. If

USE_TIME is set to ‘1’, the “Provide Time Offset Measurement” response element

shall be sent within 750 ms of ACTION_TIME. If USE_TIME is set to ‘0’, the “Provide

Time Offset Measurement” response element shall be sent within 750 ms of the

reception of the “Request Time Offset Measurement” request element.

• Request Cancellation : The mobile station shall cancel the outstanding request

element indicated by CANCEL_TYPE. The mobile station shall include a “Provide

Cancellation Acknowledgement” response element in the Posit ion Determin at ion Da ta

Message to indicate the successful cancellation of the outstanding request element.

If the mobile station has no outstanding request element of the type indicated by

CANCEL_TYPE, it shall set the NO_OUT_REQ flag in the “Provide Cancellation

Acknowledgment” response element. The “Provide Cancellation Acknowledgement”

response element shall be sent within 750 ms of the reception of the “Request

Cancellation” request element.

3.2.2.3.3.2

Base Station Response Elements Received

The mobile station should process and should make use of base station response elements.

Upon receiving a Posit ion Determin at ion Da ta Message , the mobile station should examine

the received response elements prior to processing the request elements.

If the mobile station receives “Provide GPS Almanac Correction” response element, the

mobile station shall process the response element as follows.

• If DELTA_XYZ_INCL is ‘0’, the mobile station shall set the values of DELTA_X,

DELTA_Y, DELTA_Z, DELTA_X_1ST, DELTA_Y_1ST and DELTA_Z_1ST to 0.

• If DELTA_CLOCK_INCL is ‘0’, the mobile station shall set the values of

DELTA_CLOCK and DELTA_CLOCK_1ST to 0.

3.2.2.3.4 Traffic Channel Setup

When a mobile station in the TIA/EIA-95-B Mobile Station Idle State intends to send

Posit ion Determina t ion Data Message on a Traffic Channel, the following procedures apply:

•

The mobile station shall send an Originat ion Message (see 6.7.1.3.2.4 of

TIA/EIA-95-B) containing no dialed digits and requesting Service Option 35 or

Service Option 36. The base station should complete an authentication Unique

Challenge-Response Procedure (see 6.3.12.1.5 of TIA/EIA-95-B) immediately after

assigning the traffic channel. The Unique Challenge-Response Procedure should be

completed successfully before the Posit ion Determina t ion Data Messages are sent to

the mobile station, and before the mobile-originated Posit ion Determin at ion Da ta

Messages are forwarded to other network entities.

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• Call processing following the transmission of the Originat ion Message shall follow

the procedures defined in 6.6 of TIA/EIA-95-B. When the mobile station enters the

Conversat ion Substate, the mobile station may send the Posit ion Determin at ion Da ta

Messages in accordance with the procedures defined in the next section.

3.2.2.3.5

Mobile Position Message Origination in the Conversation Substate


When the mobile station is in the TIA/EIA-95-B Mobile Stat ion Conversat ion Subs tate and

needs to send one (or more) Posit ion Determina t ion Da ta Message(s) , the mobile station shall

form one (or more) Data Burst Message(s) (see 6.7.2.3.2.4 of TIA/EIA-95-B), setting

BURST_TYPE to ‘000101’ and send the Data Burst Message(s) on the Reverse Traffic

Channel. The mobile station shall set the MSG_NUMBER and NUM_MSGS fields to 1, and

shall set NUM_FIELDS field to the number of octets in the Posit ion Determina t ion Data

Message (see 3.2.4). The Data Bu rst Message contains the Position Determination Data in

the CHARi fields (see 6.7.2.3.2.4 of TIA/EIA-95-B). The mobile station shall set the

ACK_REQ Layer-2 field to ‘1’. If the only connected service option is Service Option 35 or

Service Option 36, the mobile station should enter the Release Substate with a mobile

station release indication (see 6.6.4.5 of TIA/EIA/95-B) when Posit ion Determin at ion Da ta

Messages have not been received or have not been sent during a period of time which is

implementation-dependent. If any service option in addition to Service Option 35 or Service

Option 36 is connected, the mobile station shall remain in the Conversation Substate, and

the mobile station should initiate Service Negotiation to drop Service Option 35 or Service

Option 36 when Posit ion Determina t ion Data Messages have not been received or have not

been sent during a period of time which is implementation-dependent. If the user needs to

initiate a call and Service Option 35 or 36 is the only service option connected, then the

mobile station should release the call for Service Option 35 or 36 if needed to connect the

user call.

3.2.2.3.5.2

Unsolicited Response Elements

Reserved

3.2.2.3.5.3 Request Elements

Reserved

3.2.3 Broadcast Procedures

Reserved

3.2.4 Reverse Link Message Format

The reverse link Posit ion Determina t ion Da ta Messages are summarized in Table 3.2.4-1.

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Table 3.2 .4-1. Reverse Link Mes sages

Mes s age Nam e PD_MSG_TYPE

Posit ion Determinat ion Data

Message

‘00000000’

Reserved for future standardization ‘00000001’ through

‘10111111’

Available for manufacturer-specific


Message definition as specified in

TSB-58

‘11000000’ through

‘11111110’

Reserved ‘11111111’

The Position Determinat ion Data Message from mobile station to base station has the

following variable length format:

Fie ld Le n gth (bit s )

SESS_START 1

SESS_END 1

SESS_SOURCE 1

SESS_TAG 5

PD_MSG_TYPE (‘00000000’) 8NUM_REQUESTS 4

NUM_RESPONSES 4

The mobile station shall include NUM_REQUESTS

occurrences of the following record:

RESERVED 4

REQ_TYPE 4

REQ_PAR_LEN 8

REQ_PAR_RECORD 8 × REQ_PAR_LEN

The mobile station shall include NUM_RESPONSES


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RESERVED 3

UNSOL_RESP 1

RESP_TYPE 4

RESP_PAR_LEN 8

RESP_PAR_RECORD 8 × RESP_PAR_LEN

SESS_START – Start-of-session indicator.

If the mobile station has previously sent or received a

Posit ion Determinat ion Data Message related to this

Posit ion Determinat ion Data Message (as defined in

2.2.1) it shall set this field to ‘0’; otherwise, it shall set

this field to ‘1’.

SESS_END – End-of-session indicator.

If the mobile station does not expect to receive or send

any more Posit ion Determina t ion Data Messages related

to this Posit ion Determina t ion Data Message (as defined

in 2.2.1) the mobile station shall set this field to ‘1’;

otherwise, it shall set this field to ‘0’. The criteria for

setting this field are implementation dependent.

SESS_SOURCE – Session-source indicator.10

If SESS_START is set to ‘1’ the mobile station shall set

this field to ‘1’; otherwise it shall set this field to the

same value as the SESS_SOURCE field that appeared

in a previously-received or previously-sent Position

Determina t ion Data Message that was related to this


2.2.1).

10 This field indicates which side (mobile station or base station) initiated this session.

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SESS_TAG – Session tag.

If SESS_START is set to ‘0’ the mobile station shall set

this field to the same value as the SESS_TAG field that

appeared in a previously-received or previously-sent

Posit ion Determin at ion Da ta Messa ge that was related


in 2.2.1); otherwise, the mobile station shall set this

field to one more (modulo 32) than the value it

assigned to this field in the latest Position

Determinat ion Data Message that it sent with

SESS_START set to ‘1’. If no such latest Position

Determina t ion Data Message exists, the mobile station

shall set this field to ‘00000’. The definition of “latest”

is implementation dependent.

PD_MSG_TYPE – Posit ion Determin at ion Da ta Message type.

The mobile station shall set this field to ‘00000000’.

NUM_REQUESTS – Number of request element parameter records.

The mobile station shall set this field to the number of

request element parameters records included in the

message.

NUM_RESPONSES – Number of response element parameter records.


response element parameters records included in the

message.

RESERVED – Reserved bits.


REQ_TYPE – Request element type.

The mobile station shall set this field to the value

shown in Table 3.2.4-2.

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Table 3.2 .4-2. Request Eleme nt Type

Des cript io n REQ_TYPE

(binary)

Reserved ‘0000’

Request BS Capabilities ‘0010’

Request GPS Acquisition Assistance ‘0100’

Request GPS Location Assistance ‘0110’

Reserved ‘0111’

Request GPS Sensitivity Assistance ‘0101’

Request Base Station Almanac ‘0011’

Request GPS Almanac ‘1000’

Request GPS Ephemeris ‘1001’

Request GPS Navigation Message Bits ‘1010’

Request Location Response ‘0001’

Request GPS Almanac Correction ‘1011’

All other REQ_TYPE values are reserved.

REQ_PAR_LEN – Request element parameters length.


octets included in the REQ_PAR_RECORD field.

REQ_PAR_RECORD – Request element parameters record.

The mobile station shall set this record as described in

3.2.4.1.


The mobile station shall set these bits to ‘000’.

UNSOL_RESP – Unsolicited response indicator.

If the response element is an unsolicited response

element, the mobile station shall set this field to ‘1’;

otherwise the mobile station shall set this field to ‘0’.

RESP_TYPE – Response element type.


shown in Table 3.2.4-3.

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Table 3.2 .4-3. Respons e Elem en t Type

Des c ript ion RESP_TYPE

(binary)

Reject ‘0000’

Provide MS Information ‘0010’

Provide Autonomous Measurement Weighting Factors ‘0011’

Provide Pseudorange Measurement ‘0100’

Provide Pilot Phase Measurement ‘0101’

Provide Location Response ‘0001’

Provide Time Offset Measurement ‘0110’

Provide Cancellation Acknowledgement ‘0111’

All other RESP_TYPE values are reserved.

RESP_PAR_LEN – Response element parameters length.

The mobile station shall set RESP_PAR_LEN to the

number of octets included in the response element.

RESP_PAR_RECORD – Response element parameters record.

The mobile station shall set this record as described in

3.2.4.2.

3.2.4.1 Request Element Parameters Record

The mobile station shall set REQ_PAR_RECORD as described below 11.

If REQ_TYPE in Position Determin at ion Data Message is equal to ‘0010’, or if REQ_TYPE is

equal to ‘0101’, or if REQ_TYPE is equal to ‘1000’, the mobile station shall not include this

record. If REQ_TYPE in Position Determinat ion Data Message is equal to ‘0001’, or if

REQ_TYPE is equal to ‘0011’, or if REQ_TYPE is equal to ‘0100’, or if REQ_TYPE is equal to

‘0110’, or if REQ_TYPE is equal to ‘1001’, or if REQ_TYPE is equal to ‘1010’, or if REQ_TYPE

is equal to ‘1011’, the mobile station shall include the record REQ_PAR_RECORD and set

its fields as described below.

If REQ_TYPE is equal to ‘0100’ (Request GPS Acquisition Assistance), REQ_PAR_RECORD

shall include the following record:

11 A request element includes any parameters that directly specify the structure or contents

of the expected response. It does not include parameters that convey information about the

"state" (or status) of the mobile, or values of parameters stored in the mobile. If such

parameters are needed in support of the request, they can be conveyed in an unsolicited

response. (Note: "state" does not refer to the IS-95 state of the mobile; rather, it refers, in

general, to the internal status of the mobile).

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DOPP _REQ 1

ADD_DOPP_REQ 1

CODE_PH_PAR_REQ 1

AZ_EL_REQ 1

RESERVED 4

DOPP _REQ – Doppler (0th order) term requested.

If Doppler (0th order) terms are requested, the mobile

station shall set this field to ‘1’; otherwise the mobile

station shall set this field to ‘0’.

ADD_DOPP_REQ – Additional Doppler terms requested.

If the Doppler (0th order) terms, the Doppler High-

Order terms and the Doppler search window terms are

requested, the mobile station shall set this field to ‘1’;


CODE_PH_PAR_REQ – Code phase parameters requested.

If the code phase parameters are requested, the mobile



AZ_EL_REQ – Azimuth and elevation angle requested.

If azimuth and elevation angle are requested, the

mobile station shall set this field to ‘1’; otherwise the

mobile station shall set this field to ‘0’.



If REQ_TYPE is equal to ‘0110’ (Request GPS Location Assistance), REQ_PAR_RECORD



COORD_TYPE 1

RESERVED 7

COORD_TYPE – Coordinate type requested.

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If Cartesian coordinates are requested, the mobile

station shall set this field to ‘0’. If spherical

coordinates are requested, the mobile station shall set




If REQ_TYPE is equal to ‘0011’ (Request Base Station Almanac), REQ_PAR_RECORD shall

include the following record:


EXT_BS_ALM 1

RESERVED 7

EXT_BS_ALM – Extended base station almanac requested.

If the extended base station almanac is requested, the

mobile station shall set this field to ‘1’. If the base

station almanac is requested, the mobile station shall

set this field to ‘0’.



If REQ_TYPE is equal to ‘1001’ (Request GPS Ephemeris), REQ_PAR_RECORD shall include

the following record:


AB_PAR_REQ 1

RESERVED 7

AB_PAR_REQ – Alpha/Beta parameters requested.

If Alpha/Beta parameters are requested, the mobile





If REQ_TYPE is equal to ‘1010’ (Request GPS Navigation Message Bits), REQ_PAR_RECORD


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SUBF_4_5_REQ 1

RESERVED 7

SUBF_4_5_REQ – Subframes 4 and 5 requested.

If subframes 4 and 5 are requested, the mobile station

shall set this field to ‘1’; otherwise the mobile station

shall set this field to ‘0’.



If REQ_TYPE is equal to ‘0001’ (Request Location Response), REQ_PAR_RECORD shall



HEIGHT_REQ 1

CLK_COR_GPS_REQ 1

VELOCITY_REQ 1

RESERVED 5

HEIGHT_REQ – Height information requested.

If height information is requested, the mobile station



CLK_COR_GPS_REQ – Clock correction for GPS time requested.

If clock correction for GPS time is requested, the

mobile station shall set this field to ‘1’; otherwise the

mobile station shall set this field to ‘0’.

VELOCITY_REQ – Velocity information requested.

If velocity information is requested, the mobile station





If REQ_TYPE is equal to ‘1011’ (Request GPS Almanac Correction), REQ_PAR_RECORD


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Fie ld Len gth (bit s )

TOA 8

WEEK_NUM 8

TOA – Time of almanac.

The mobile station shall set this field to the time of

applicability of the almanac for which the correction is

requested, in units of 4096 s, in the range from 0 to

602,112 s.

WEEK_NUM – GPS week number.

The mobile station shall set this field to the 8 least

significant bits of the GPS week number of the

almanac for which the correction is requested. The

range for this field is from 0 to 255.

3.2.4.2 Response Element Parameters Record

The mobile station shall set RESP_PAR_RECORD as described below.

If RESP_TYPE in Position Determinat ion Data Message is equal to ‘0000’ (Reject),

RESP_PAR_RECORD shall include the following record:


REJ_REQ_TYPE 4

REJ_REASON 3

RESERVED 1

REJ_REQ_TYPE – Reject request type.

The mobile station shall set this field to the value of

the REQ_TYPE corresponding to the request element it

rejects. See Table 4.2.4-2.

REJ_REASON – Reject reason.


shown in Table 3.2.4.2-1.

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Table 3.2 .4.2 -1. Reject Reason

Reason for rejectionREJ_REASON

(binary)

Capability not supported by the mobile station ‘000’

Capability normally supported by the mobile

station but temporarily not available or not

enabled12

‘001’

All other REJ_REASON values are reserved.



If RESP_TYPE is equal to ‘0010’ (Provide MS Information), RESP_PAR_RECORD shall

include the following variable-length record:


MS_LS_REV 6

MS_MODE 4

PILOT_PH_CAP 6

GPS_ACQ_CAP 12

LOC_CALC_CAP 12

MS_LS_REV – The mobile station location standard revision number.


MS_MODE – The digital mode indicator.


PILOT_PH_CAP – Pilot phase capability.



12 For example, the position determination feature may be disabled by the user.

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Table 3.2 .4.2 -2. Pi lot Phase Capabil i ty

PILOT_PH

(binary)

IS-95 Pilot Phase Capability

‘000000’ Full Chip Measurement Capability

‘000001’ Half Chip Measurement Capability

‘000010’ Quarter Chip Measurement Capability

‘000011’ Eighth Chip Measurement Capability

‘000100’ One Sixteenth Chip Measurement Capability

All other PILOT_PH values are reserved.

GPS_ACQ_CAP – GPS acquisition capability.

GPS_ACQ_CAP consists of 12 bits, each of the LSB’s

represents one GPS acquisition capability. The

mapping of the bits is listed in Table 3.2.4.2-3. If a

GPS acquisition capability is supported, the mobile

station shall set the corresponding bit in

GPS_ACQ_CAP to ‘1’; otherwise the mobile station

shall set the corresponding bit to ‘0’. Bits 8-12 shall

be set to ‘00000’.

Table 3.2 .4 .2 -3. Mapping Table for GPS Acquis ition Capability

Corresponding Bi t in GPS_ACQ_CAP GPS Acquis i t ion Capabi li ty

Bit 1 (LSB) GPS Acquisition Assistance

Bit 2 GPS Sensitivity Assistance

Bit 3 GPS Almanac

Bit 4 GPS Ephemeris

Bit 5 GPS Navigation Message Bits

Bit 6 GPS Almanac Correction

Bit 7 GPS Autonomous Acquisition Capable

Bits 8 – 12 Reserved

LOC_CALC_CAP – Position calculation capability.

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LOC_CALC_CAP consists of 12 bits, each of the LSB’s

represents one position calculation capability. The

mapping of the bits is listed in Table 3.2.4.2-4. If a

position calculation capability is supported, the mobile

station shall set the corresponding bit in

LOC_CALC_CAP to ‘1’; otherwise the mobile station

shall set the corresponding bit to ‘0’. Bits 9-11 shall

be set to ‘000’.

Table 3.2 .4 .2 -4. Mapping Table for Pos ition Calculation Capability

Corres ponding Bit in LOC_ACQ_CAP Posit ion Calculation Capabili ty

Bit 1 (LSB) Location Calculation Capable using

Location Assistance – Spherical

Bit 2 Location Calculation Capable using

Location Assistance – Cartesian

Bit 3 Advanced Forward Link Trilateration

(AFLT) Location Calculation Capable

Bit 4 Location Calculation Capable using GPS

Almanac Assistance


Ephemeris Assistance


Almanac Correction

Bit 7 Autonomous Location Calculation CapableBit 8 Hybrid GPS and AFLT Location

Calculation Capable

Bit 9 –11 Reserved

Bits 12 (MSB) Pre-programmed Location

If RESP_TYPE is equal to ‘0011’ (Provide Autonomous Measurement Weighting Factors),

RESP_PAR_RECORD shall include the following variable length record:

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TIME_REF_CDMA 14

DGPS 1

NUM_SV 4

GPS_WEIGHT 4

The mobile station shall include NUM_SV occurrences of the

following fields:

SV_PRN_NUM 6

INV_WEIGHT_FA 6

RESERVED 0 - 7 (as needed)

TIME_REF_CDMA – CDMA system time at the time the solution is valid.

The mobile station shall set this field to (t/50 mod

16384), where t is the CDMA system time in frames, as

defined in 1.2 of TIA/EIA-95-B, at the time the

solution is valid. This is the time at which the values

of the parameters reported in this response element

parameter record are valid.

DGPS – DGPS flag.

If differential GPS is used, the mobile station shall set

this field to ‘1’; otherwise the mobile station shall set


NUM_SV – Number of GPS satellites in solution.


GPS satellites used to compute the solution, in the

range from 1 to 16, where the binary value of the field

conveys the number of satellites minus one.

GPS_WEIGHT – Ratio of GPS weight to total weight.

The mobile station shall set this field to the ratio of

GPS weight to total weight (GPS weight and pilot phase

weight) used to compute the solution, in the range

from 0 to 1, with a resolution of 1/15.

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SV_PRN_NUM – Satellite PRN number.


the PRN signal number for which the measured data is

valid. It is represented as an unsigned value in the


conveys the satellite PRN number minus one.

INV_WEIGHT_FA – Inverse of weighting factor.

The mobile station shall set this field to the inverse of

the weighting factor used for the satellite, in the range

from 0.5 m to 112 m. A “floating-point” representation

is used where the 3 most significant bits constitute the

exponent and the 3 least significant bits constitute the

mantissa as specified in Table 3.2.4.2-5.

Table 3 .2.4 .2-5. Inverse of Weightin g Factor Represen tation

Ex po n en t , X Man t is s a, YIndex value, i

= Y + 8 × X

Floating-Point

value, f i

Inverse Weighting

Fact or value, (m )

‘000’ ‘000’ 0 0.5 σ < 0.5

‘000’ ‘001’ 1 0.5625 0.5 ≤ σ < 0.5625

X Y 2 ≤ i ≤ 61 0.5×(1 + Y /8)×2X

f i- 1 ≤ σ < f

i

‘111’ ‘110’ 62 112 104 ≤ σ < 112

‘111’ ‘111’ 63 Not Applicable 112 ≤ σ


The mobile station shall add reserved bits as needed in

order to make the length of the response element

parameters record equal to an integer number of

octets. The mobile station shall set these bits to ‘0’.

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If RESP_TYPE is equal to ‘0100’ (Provide Pseudorange Measurement), RESP_PAR_RECORD

shall include the following variable length record:


PART_NUM 3

TOTAL_PARTS 3

NUM_PS_RANGES_P 6

TIME_REF 24

TIME_REF_SRC 2

OFFSET_INCL 1

REF_PN 0 or 9

MOB_SYS_T_OFFSET 0 or 14

The mobile station shall include NUM_PS_RANGES_P

occurrences of the following fields:

SV_PRN_NUM 6

SV_CNO 6

PS_DOPPLER 16

SV_CODE_PH_WH 10

SV_CODE_PH_FR 10

MUL_PATH_IND 3

PS_RANGE_RMS_ER 6


PART_NUM – The part number.

The mobile station shall set this field to specify the

part number of the Pseudorange Measurement data, in

the range from 1 to TOTAL_PARTS.

TOTAL_PARTS – The total number of parts.


total number of parts that the Pseudorange

Measurement data is divided into, in the range from 1

to 8.

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NUM_PS_RANGES_P – Number of pseudoranges in this part.


pseudoranges included in this part of the response

element, in the range from 1 to 64, where the binary

value of the field conveys the number of satellites

minus one.

TIME_REF – The time of validity of the parameters reported in this

response element.

The mobile station shall set this field to

(t mod 14,400,000), where t is the time of validity in

units of 1 ms, based on the time reference specified by

TIME_REF_SRC (see Table 3.2.4.2-6). This is the time

at which the values of the parameters reported in this

response element parameter record are valid.

TIME_REF_SRC – Time reference source.

The mobile station shall set this field according to

Table 3.2.4.2-6.

Table 3 .2.4 .2-6. Time Reference Source

Time reference s ourceTIME_REF_SRC

(binary)

Mobile station time reference as defined in 6.1.5.1 of

TIA/EIA-95-B

‘00’

GPS time reference ‘01’

Other time reference ‘10’

Reserved ‘11’

OFFSET_INCL – Offset Included.

If the response element includes REF_PN and

MOB_SYS_T_OFFSET fields, then the mobile station



REF_PN – Time reference PN sequence offset.

If the OFFSET_INCL field is set to ‘1’, then the mobile

station shall set this field to the PN sequence offset of

the pilot used by the mobile station to derive its time

reference, relative to the zero offset pilot PN sequence

in units of 64 PN chips; otherwise the mobile station

shall not include this field.

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MOB_SYS_T_OFFSET– Mobile station system time offset.


station shall set this field to the two’s complement

value of the offset between mobile station time

reference and time of occurrence of Reference PN, in

units of 1/16 TIA/EIA-95-B chips13, in the range from

-512 to +511.9375 TIA/EIA-95-B chips; otherwise the

mobile station shall not include this field. The sign of

this quantity shall be positive if the reference PN

occurs earlier than the mobile station time reference;

otherwise it shall be negative.

SV_PRN_NUM – Satellite PRN number.






SV_CNO – Satellite C/N0.


the satellite C/N0, as referenced to the antenna

connector 14, in units of 1 dB-Hz, in the range from 0 to

63 dB-Hz.

PS_DOPPLER – Pseudodoppler.

The mobile station shall set this field to the two’s

complement value of the measured satellite

pseudodoppler, in units of 0.2 Hz, in the range from

-6,553.6 Hz to +6,553.6 Hz.

SV_CODE_PH_WH – Satellite code phase – whole chips.

The mobile station shall set this field to the satellite

code phase measured as a number of GPS chips, in

units of 1 GPS chips, in the range from 0 to 1022

chips.

13 This field supports a maximum resolution of 1/16

th of a TIA/EIA-95-B chip. However,

mobile stations not capable of 1/16th chip measurement resolution are also supported by

this standard (See Table 3.2.4.2-2). Measurements made at lower resolutions are reported

in this field using 1/16th chip resolution.

14 If an active antenna is employed (i.e., one with a built-in amplifier and/or filter), then

C/N0 should be referenced to the antenna port prior to any amplifier or filter.

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SV_CODE_PH_FR – Satellite code phase – fractional chips.

The mobile station shall set this field to the residual

satellite code phase, in units of 1/210

of GPS chips, in

the range from 0 to (210

-1)/210

GPS chips.

MUL_PATH_IND – Multipath indicator.



Table 3.2 .4.2 -7 . Multipath Indicator

DescriptionTh res h o ld MUL_PATH_IND

(binary)

Not measured Not specified ‘000’

Low MP Error ≤ 5 m ‘001’

Medium 5 m < MP Error ≤ 43 m ‘010’

High MP Error > 43 m ‘011’

All other MUL_PATH_IND values are reserved.

PS_RANGE_RMS_ER – Pseudorange RMS error.

The mobile station shall set this field to the

pseudorange RMS error used for the satellite, in the

range from 0.5 m to 112 m. A “floating-point”

representation is used where the 3 most significant

bits constitute the exponent and the 3 least significant

bits constitute the mantissa as specified in Table

3.2.4.2-8.

Table 3 .2.4 .2-8. Pseudorange RMS Error Represent ation

Ex po n en t , X Man t is s a, YIndex value, i

= Y + 8 ×X

Floating-Point

value, f i

Pseudorange value,

P (m )

‘000’ ‘000’ 0 0.5 P < 0.5

‘000’ ‘001’ 1 0.5625 0.5 ≤ P < 0.5625

X Y 2 ≤ i ≤ 61 0.5×(1 + Y /8)×2X f i- 1 ≤ P < f

i

‘111’ ‘110’ 62 112 104 ≤ P < 112

‘111’ ‘111’ 63 Not Applicable 112 ≤ P

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If RESP_TYPE is equal to ‘0101’ (Provide Pilot Phase Measurement), RESP_PAR_RECORD

shall include the following variable length record:


TIME_REF_MS 24

OFFSET_INCL 1

MOB_SYS_T_OFFSET 0 or 14

REF_PN 9

PILOT_STRENGTH 6

BAND_CLASS 5

CDMA_FREQ 11

BASE_ID 16

SID 15

NID 16

PART_NUM 3

TOTAL_PARTS 3

NUM_PILOTS_P 6

The mobile station shall include NUM_PILOTS_P occurrences

of the following two-field record:

PILOT_PN_PHASE 19

RMS_ERR_PHASE 6

ADD_PILOTS_INCL 1

ADD_BAND_CLASS 0 or 5

ADD_CDMA_FREQ 0 or 11

NUM_ADD_PILOTS_P 0 or 6

If ADD_PILOT_INCL is set to ‘1’, the mobile station shall

include NUM_ADD_PILOTS_P occurrences of the following

two-field record:

ADD_PILOT_PN_PH 19

ADD_RMS_ERR_PH 6


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TIME_REF_MS – The time of validity of the parameters reported in this

response element.



units of 1 ms, based on mobile station time reference

as defined in 6.1.5.1 of TIA/EIA-95-B. This is the time



OFFSET_INCL – Offset Included.

If the response element includes MOB_SYS_T_OFFSET

field, then the mobile station shall set this field to ‘1’;


MOB_SYS_T_OFFSET – Mobile station system time offset. See 6.1.5.1 of

TIA/EIA-95-B.



value of the offset between mobile station time

reference and time of occurrence of Reference PN, in

units of 1/16 TIA/EIA-95-B chips, in the range from

-512 to +511.9375 TIA/EIA-95-B chips; otherwise the

mobile station shall not include this field. The sign of

this quantity shall be positive if the reference PN

occurs earlier than the mobile station time reference;



The mobile station shall set this field to the PN

sequence offset of the pilot used by the mobile station

to derive its time reference, relative to the zero offset

pilot PN sequence in units of 64 PN chips.

PILOT_STRENGTH – Pilot strength.

This parameter conveys the Ec/Io of this pilot (as

specified in 6.6.6.2.2 of TIA/EIA-95-B), in the units of

0.5 dB, in the range from 0 to –31.5 dB. The mobile

station shall set this field to

-2 × 10 log10 PS,

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where PS is the strength of the pilot used by the

mobile station to derive its time reference (see 6.1.5.1

of TIA/EIA-95-B), measured as specified in 6.6.6.2.2 of

TIA/EIA-95-B. If this value (-2 × 10 log10 PS) is less

than 0, the mobile station shall set this field to

‘000000’. If this value is greater than 63, the mobile


BAND_CLASS – Band class.

The mobile station shall set this field to the CDMA

band class of the pilots that are reported in this

response element, as specified in TSB58-B.

CDMA_FREQ – Frequency assignment.

The mobile station shall set this field to the CDMA

Channel number, in the specified CDMA band class, of

the pilots that are reported in this response element,

as specified in 6.1.1.1 of TIA/EIA-95-B.

BASE_ID – Base Station Identification.

If the mobile station is on the Paging Channel, the

mobile station shall set this field to the base station

identification number obtained from the Paging

Channel that the mobile station is demodulating;

otherwise, the mobile station shall set this field to the

base station identification number obtained from the

Paging Channel that the mobile station last

demodulated.

SID – System Identification.


mobile station shall set this field to the system




system identification number obtained from the Paging

Channel that the mobile station last demodulated.

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NID – Network Identification.


mobile station shall set this field to the network




network identification number obtained from the

Paging Channel that the mobile station last

demodulated.



part number of the Pilot Phase Measurement data, in




total number of parts that the Pilot Phase

Measurement data is divided into, in the range from 1

to 8.

NUM_PILOTS_P – Number of pilots in this part.


pilots to be reported in this part of the response

element (not including additional pilots, as defined by

NUM_ADD_PILOTS_P).

The mobile station shall include NUM_PILOTS_P occurrences of the following pair of fields

for each pilot in the Active Set, and for each pilot in the Candidate or Neighbor Set whose

pilot strength is greater than T_DROP15, other than the pilot identified by the REF_PN field.

PILOT_PN_PHASE – Pilot measured phase.

The mobile station shall set this field to the phase of

the pilot PN sequence relative to the zero offset pilot PN

sequence of this pilot, in units of 1/16 TIA/EIA-95 PN

chips, in the range from 0 to 32,767.875 chips. The

pilot arrival time shall be the time of occurrence, as

measured at the mobile station antenna connector, of

the earliest arriving usable multipath component of

the pilot. See 6.6.6.2.4 of TIA/EIA-95-B.

15 T_DROP is defined in TIA/EIA-95-B.

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RMS_ERR_PHASE – RMS error in phase measurement. This field

represents the mobile station’s best estimate of the

standard deviation of PILOT_PN_PHASE.

The mobile station shall set this field to a value in the

range from 1 m to 224 m. A “floating-point”

representation is used where the 3 most significant

bits constitute the exponent and the 3 least significant

bits constitute the mantissa as specified in Table

3.2.4.2-9.

Table 3 .2.4 .2-9. RMS Error in Pi lot Phase Measu rem ent Represe ntation

Ex po n en t , X Man t is s a, YInde x value, i

= Y + 8 ×X

Floating-Point

value, f i

RMS Error in Pilo t

Phase Measurement

Value, (m)

‘000’ ‘000’ 0 1 σ < 1‘000’ ‘001’ 1 1.125 1 ≤ σ < 1.125

X Y 2 ≤ i ≤ 61 (1 + Y /8)×2X

f i- 1 ≤ σ < f

i

‘111’ ‘110’ 62 224 208 ≤ σ < 224

‘111’ ‘111’ 63 Not Applicable 224 ≤ σ

ADD_PILOTS_INCL – Additional pilots included.

If this part of the response element includes additional

pilots belonging to a different CDMA channel number

or to a different CDMA band class, the mobile station



ADD_BAND_CLASS – Additional band class.

If ADD_PILOTS_INCL is set to ‘1’, the mobile station

shall set this field to the CDMA band class of the

additional pilots that are reported in this part of the

response element, as specified in TSB58-B; otherwise

the mobile station shall not include this field.

ADD_CDMA_FREQ – Additional frequency assignment.


shall set this field to the CDMA channel number, in

the specified CDMA band class, of the additional pilots

that are reported in the response element, as specified

in 6.1.1.1 of TIA/EIA-95-B; otherwise the mobile

station shall not include this field.

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NUM_ADD_PILOTS_P – Number of additional pilots in this part.


shall set this field to the number of additional pilots to

be reported in this part of the response element;

otherwise the mobile station shall not include this

field.

The mobile station shall include NUM_ADD_PILOTS_P occurrences of the following pair of

fields for pilots whose pilot strength is greater than T_DROP.

ADD_PILOT_PN_PH – Additional pilot measured phase.

The mobile station shall set this field to the phase of

the pilot PN sequence relative to the zero offset pilot PN

sequence of this pilot, in units of 1/16 TIA/EIA-95 PN

chips, in the range from 0 to 32,767.875 chips. The

pilot arrival time shall be the time of occurrence, as

measured at the mobile station antenna connector, of

the earliest arriving usable multipath component of

the pilot. See 6.6.6.2.4 of TIA/EIA-95-B.

ADD_RMS_ERR_PH – Additional pilot RMS error in phase measurement.

This field represents the mobile station’s best estimate

of the standard deviation of ADD_PILOT_PN_PH.

The mobile station shall set this field to a value

according to Table 3.2.4.2-9.






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If RESP_TYPE is equal to ‘0001’ (Provide Location Response), RESP_PAR_RECORD shall

include the following variable length record:


TIME_REF_CDMA 14

LAT 25

LONG 26

LOC_UNCRTNTY_ANG 4

LOC_UNCRTNTY_A 5

LOC_UNCRTNTY_P 5

FIX_TYPE 1

VELOCITY_INCL 1

VELOCITY_HOR 0 or 9HEADING 0 or 10

VELOCITY_VER 0 or 8

CLOCK_INCL 1

CLOCK_BIAS 0 or 18

CLOCK_DRIFT 0 or 16

HEIGHT_INCL 1

HEIGHT 0 or 14

LOC_UNCRTNTY_V 0 or 5



The mobile station shall set this field to (t/50 mod






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LAT – Latitude.


complement value of the latitude, in units of 180/225

degrees, in the range from -90 degrees to +90×(1-2-24

)

degrees, referenced to the WGS-84 reference ellipsoid,

counting positive angles north of the equator and

negative angles south of the equator,

LONG – Longitude.


complement value of the longitude, in units of 360/226

degrees, in the range from -180 degrees to

+180×(1-2-25

) degrees, referenced to the WGS-84

reference ellipsoid, counting positive angles east of the

Greenwich meridian and negative angles west of the

Greenwich meridian.

LOC_UNCRTNTY_ANG– Angle of axis with respect to True North for position

uncertainty.

The mobile station shall set this field to the angle of

axis for position uncertainty, in units of 5.625 degrees,

in the range from 0 to 84.375 degrees, where 0 degrees

is True North and the angle increases toward the East.

LOC_UNCRTNTY_A – Standard deviation of axis along angle specified for

position uncertainty.

The mobile station shall set this field to represent the

standard deviation of axis along angle specified for

position uncertainty as specified in Table 3.2.4.2-10.

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Table 3 .2.4 .2-10 . Posit ion Unc ertainty

LOC_UNCRTNTY S t an d ard De v ia ti on fo r Po s it io n Un c e rt ai n t y (m e t e rs )

‘00000’ 0.5

‘00001’ 0.75

‘00010’ 1

‘00011’ 1.5

‘00100’ 2

‘00101’ 3

‘00110’ 4

‘00111’ 6

‘01000’ 8

‘01001’ 12

‘01010’ 16

‘01011’ 24

‘01100’ 32

‘01101’ 48

‘01110’ 64

‘01111’ 96

‘10000’ 128

‘10001’ 192

‘10010’ 256

‘10011’ 384

‘10100’ 512

‘10101’ 768

‘10110’ 1,024

‘10111’ 1,536

‘11000’ 2,048

‘11001’ 3,072

‘11010’ 4,096

‘11011’ 6,144

‘11100’ 8,192

‘11101’ 12,288

‘11110’ >12,288

‘11111’ Not computable

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LOC_UNCRTNTY_P – Standard deviation of axis perpendicular to angle

specified for position uncertainty.

The mobile station shall set this field to represent the

Standard Deviation of Axis Perpendicular to Angle

Specified for Position Uncertainty as specified in Table

3.2.4.2-10.

FIX_TYPE – Fix type.

The mobile station shall set this field to ‘0’ for 2D fix

and to ‘1’ for 3D fix.

VELOCITY_INCL – Velocity information included.

If velocity information is included in this response

element, the mobile station shall set this field to ‘1’. If

velocity information16 is not included in this response

element, the mobile station shall set this field to ‘0’.

VELOCITY_HOR – Horizontal velocity magnitude.

If VELOCITY_INCL is set to ‘1’, the mobile station shall

set this field to the horizontal velocity, in units of 0.25

m/s, in the range from 0 to 127.75 m/s; otherwise the

mobile station shall not include this field.

Note that this field is not included for cases in which

the measurement technique does not permit

calculation of value.

HEADING – Heading.

If VELOCITY_INCL is set to ‘1’, the mobile station shall

set this field to Heading, in units of 360/210 degrees, in

the range from 0 to 360×(1-2-10

) degrees; otherwise the

mobile station shall not include this field, where 0

degrees is True North and the angle increases toward

the East.




16 Velocity information includes the horizontal and vertical components of velocity, as well

as heading.

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VELOCITY_VER – Vertical velocity.

If VELOCITY_INCL and FIX_TYPE are set to ‘1’, the

mobile station shall set this field to the two’s

complement value of Vertical Velocity, in units of 0.5

m/s, in the range from -64 m/s to +63.5 m/s;


field.




CLOCK_INCL – Clock information included.

If clock information is included in this response

element, the mobile station shall set this field to ‘1’. If

clock information is not included in this response

element, the mobile station shall set this field to ‘0’.

CLOCK_BIAS – Clock bias.

If CLOCK_INCL is set to ‘1’, the mobile station shall set

this field to the clock bias in units of 1 ns, in the range

from -13,000 ns to +249,143 ns; otherwise the mobile

station shall not include this field. This parameter is

computed as true GPS time minus mobile station time

reference as defined in TIA/EIA-95.

Note that as part of a GPS fix, the computation yields

an estimate of the discrepancy between the time

specified by the local clock and true GPS time. This

parameter reports the discrepancy. The main cause of

this discrepancy is going to be the propagation delay

from the base station to the MS, which is always

positive. Accordingly, the range allowed for this

parameter is not symmetric.

CLOCK_DRIFT – Clock drift.

If CLOCK_INCL is set to ‘1’, the mobile station shall set

this field to the two’s complement value of the rate of

change of clock bias in units of ppb (ns/s), in the

range from -32768 ppb (ns/s) to +32767 ppb (ns/s);


field.

HEIGHT_INCL – Height information included.

If height information is included in this response

element, the mobile station shall set this field to ‘1’;

otherwise, the mobile station shall set this field to ‘0’.

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HEIGHT – Height.

If HEIGHT_INCL is set to ‘1’, the mobile station shall

set this field to the height above the WGS-84 reference

ellipsoid, in units of 1 meter, in the range from -500 m

to 15833 m; otherwise it shall not include this field.

LOC_UNCRTNTY_V – Standard deviation of vertical error for position

uncertainty.

If HEIGHT_INCL is set to ‘1’, the mobile station shall

include this field and set this field to represent the

Standard Deviation Vertical Error for Position

Uncertainty as specified in Table 3.2.4.2-10; otherwise

the mobile station shall not include this field.









If RESP_TYPE is equal to ‘0110’ (Provide Time Offset Measurement), RESP_PAR_RECORD



TIME_REF_MS 24

REF_PN 9

MOB_SYS_T_OFFSET 14

RESERVED 1

TIME_REF_MS – The time of validity of the parameters reported in this

response element.



units of 1 ms, based on mobile station time reference

as defined in 6.1.5.1 of TIA/EIA-95-B. This is the time



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The mobile station shall set this field to the PN

sequence offset of the pilot used by the mobile station

to derive its time reference, relative to the zero offset

pilot PN sequence in units of 64 PN chips.

MOB_SYS_T_OFFSET– Mobile station system time offset.


complement value of the offset between mobile station

time reference and time of occurrence of Reference PN,

in units of 1/16 TIA/EIA-95 chips, in the range from

-512 to +511.9375 TIA/EIA-95 chips. The sign of this

quantity shall be positive if the reference PN occurs

earlier than the mobile station time reference;




If RESP_TYPE is equal to ‘0111’ (Provide Cancellation Acknowledgement),



CANCEL_TYPE_ACK 4

NO_OUT_REQ 1

RESERVED 3

CANCEL_TYPE_ACK – Cancellation type.


CANCEL_TYPE included in the corresponding request

element (“Request Cancellation”).

NO_OUT_REQ – No outstanding request element.

If there is no outstanding request element of the type

indicated by CANCEL_TYPE_ACK, the mobile station





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4 BASE STATION PROCEDURES

4 .1 Analog Base S tation Proce dures

The analog base station procedures are defined in [7].

4 .2 CDMA Base S tatio n Proce dures

4.2.1

Position Determination Data Message Processing

4.2.1.1

Overview

The Posit ion Determina t ion Data Message sent by the base station is comprised of request

elements and response elements, as specified below.

Request elements sent by base station:

• Request MS Information

•

Request Autonomous Measurement Weighting Factors

•

Request Pseudorange Measurement

•

Request Pilot Phase Measurement


• Request Time Offset Measurement

•

Request Cancellation

Response elements sent by base station:

• Reject

• Provide BS Capabilities

• Provide GPS Acquisition Assistance

• Provide GPS Location Assistance – Spherical Coordinates

• Provide GPS Location Assistance – Cartesian Coordinates

• Provide GPS Sensitivity Assistance

• Provide Base Station Almanac

• Provide GPS Almanac

•

Provide GPS Ephemeris

• Provide GPS Navigation Message Bits

• Provide Location Response

•


The Posit ion Determina t ion Data Message received by the base station is also comprised of

request elements and response elements, as specified below.

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Request elements received by base station:

• Request BS Capabilities

• Request GPS Acquisition Assistance

• Request GPS Location Assistance

•

Request GPS Sensitivity Assistance

• Request Base Station Almanac

• Request GPS Almanac

• Request GPS Ephemeris

•

Request GPS Navigation Message Bits


• Request GPS Almanac Correction

Response elements received by base station:

• Reject

• Provide MS Information

• Provide Autonomous Measurement Weighting Factors

•

Provide Pseudorange Measurement

• Provide Pilot Phase Measurement

• Provide Location Response

•

Provide Time Offset Measurement

•

Provide Cancellation Acknowledgement

Response elements sent by the base station may be generated in response to request

elements received by the base station or they may be generated as unsolicited response

elements. Every request element includes a REQ_TYPE (request element type) field that

uniquely identifies the request element (See Table 4.2.4-2). Every response element

includes a RESP_TYPE (response element type) field that uniquely identifies the response

element (See Table 4.2.4-3). Multiple response elements may be associated with a single

request element. Unsolicited response elements are sent with the UNSOL_RESP flag set to

‘1’ (see 4.2.4).

4.2.1.2 Requirements

Each Posit ion Determina t ion Data M essage shall contain at least one request element, or at

least one part of a response element, or both. No more than one request element of a

specific REQ_TYPE shall be included in a Posit ion Determina t ion Data Message . Each

request element shall be fully contained in a Posit ion Determina t ion Data Message . Some

response elements may be divided in parts (see 4.2.4.2). Each response element part shall

be fully contained in a Posit ion Determina t ion Data Message .

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If the base station sends a response element in response to a received request element, it

shall comply with Table 4.2.1.2-1. A “Reject” shall not be sent as a response element to a

“Request BS Capabilities” request element.

If one or more response elements from the base station can be useful to the mobile station

in responding to a request from the base station, the base station should include all or part

of each response element and the request element in the same Posit ion Determinat ion Data

Message .

Upon receiving a Posit ion Determin at ion Da ta Message , the base station should examine the

received response elements prior to processing the request elements.

Table 4 .2 .1 .2 -1 . Response Elem ents Sen t in Response to Received Request Elemen ts

Reques t e lem e n t re ce ive d Pos s ible res pon s e e lem en ts

Request BS Capabilities Provide BS Capabilities

Reject Request GPS Acquisition Assistance

Provide GPS Acquisition Assistance

Reject

Provide GPS Location Assistance –

Spherical Coordinates And

Provide GPS Acquisition AssistanceRequest GPS Location Assistance

Provide GPS Location Assistance –

Cartesian Coordinates And

Provide GPS Acquisition Assistance

Reject Request GPS Sensitivity Assistance

Provide GPS Sensitivity Assistance

Reject Request Base Station Almanac

Provide Base Station Almanac

Reject Request GPS Almanac

Provide GPS Almanac

Reject Request GPS Ephemeris

Provide GPS Ephemeris

Reject Request GPS Navigation Message BitsProvide GPS Navigation Message Bits

Reject Request Location Response


Reject Request GPS Almanac Correction


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No more than one request element shall be outstanding at any given time for each

REQ_TYPE. If an additional request element is received while there is an outstanding

request element of the same type, the additional request element shall be discarded. A

received (or sent) request element is considered outstanding until all of the corresponding

response elements or a “Reject” for the request element have been sent (or received).

Unsolicited response elements shall have the UNSOL_RESP flag set to ‘1’.

If a “Reject” constitutes the sent response element, its REJ_REQ_TYPE shall be set to the

REQ_TYPE of the corresponding request element.

4.2.2 Point-to-point Procedures

This section defines the procedures for the processing of mobile-terminated Position

Determina t ion Data Messages that are addressed to individual mobile stations and for the

processing of all mobile-originated Posit ion Determ inat ion Data Messages .

4.2.2.1

Control Channel Procedure

4.2.2.1.1 Mobile Position Message Origination

A base station supporting Position Determination shall accept and shall process Data Burst

Messages received on the CDMA Access Channel (see 6.7.1.3.2.3 of TIA/EIA-95-B). The

processing of TIA/EIA-95-B Layer-2 fields shall be in accordance with TIA/EIA-95-B. Data

Burst Messages used to transport Position Determination request and response elements

shall always be acknowledged (Layer 2) and the in-order delivery over the air interface shall

be guaranteed by the transmitting entities: Mobile station and base station.

The base station shall process all Data Burst Messages received on the Access Channel and

having the BURST_TYPE field set to ‘000101’.

The base station shall discard the message without further processing if one or more of the

following is true:



•

NUM_FIELDS field is set to zero.

Otherwise, the base station shall process the Position Determination Data contained in the

CHARi fields of the received Data Burst Message (see 6.7.1.3.2.3 of TIA/EIA-95-B), as

described below.

4.2.2.1.1.1 Mobile Station Request Elements Received

If the base station does not support the requested capability, the base station shall respond

with a “Reject” response element with the appropriate reject reason, unless the mobile

station request element is “Request BS Capabilities”; otherwise, the base station shall

include the appropriate response elements in the response Position Determination Data

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(see 4.2.4) as described below. The response Position Determination Data shall reside in

the CHARi fields of the response Data B urst Message (see 7.7.2.3.2.9 of TIA/EIA-95-B).17

• Request BS Capabil i ty: The base station shall respond with the “Provide BS

Capabilities” response element.

•

Request GPS Acquisit ion Assistance: The base station shall respond with the

“Provide GPS Acquisition Assistance” response element.

If DOPP_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance” response

element shall include the Doppler 0th order term and ADD_DOPP_INCL flag;

otherwise, the “Provide GPS Acquisition Assistance” response element should

not include the Doppler 0th order term and ADD_DOPP_INCL flag.

If ADD_DOPP_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance”

response element shall include the high-order Doppler and the Doppler

search window terms; otherwise, the “Provide GPS Acquisition Assistance”

response element should not include the high-order Doppler and the Doppler

search window terms.

If CODE_PH_PAR_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance”

response element shall include the code phase parameters; otherwise, the

“Provide GPS Acquisition Assistance” response element should not include

the code phase parameters.

If AZ_EL_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance” response

element shall include the azimuth and elevation angles; otherwise, the


the azimuth and elevation angles.

• Request GPS Location As sist an ce: The base station shall respond with the “Provide

GPS Location Assistance – Spherical Coordinates” or with the “Provide GPS Location

Assistance – Cartesian Coordinates” response element. If COORD_TYPE is set to ‘1’,

the base station shall provide the “Provide GPS Location Assistance – Spherical

Coordinates” response element; otherwise, the base station shall provide the

“Provide GPS Location Assistance – Cartesian Coordinates” response element. The

base station shall also send the “Provide GPS Acquisition Assistance” response

element in the same Posit ion Determin at ion Data Message that contains the “Provide

GPS Location Assistance – Spherical Coordinates” response element or the “Provide

GPS Location Assistance – Cartesian Coordinates” response element. The value of

NUM_SV_P in each part of the “Provide GPS Location Assistance – Spherical

Coordinates” response element or the “Provide GPS Location Assistance – Cartesian

Coordinates” response element shall be the same as the value of NUM_SV_P in the

part of the “Provide GPS Acquisition Assistance” response element that appears in

the same Posit ion Determinat ion Data Message . The “Provide GPS Location

Assistance – Spherical Coordinates” response element or the “Provide GPS Location

Assistance – Cartesian Coordinates” response element shall have the satellite


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related fields repeated in the same SV_PRN_NUM order as contained in the “Provide

GPS Acquisition Assistance” response element.

• Request GPS Sensitivit y Ass ista nce: The base station shall respond with a “Provide

GPS Sensitivity Assistance” response element in one or more response Position

Determinat ion Data Messages , according to the number of parts into which the

response element is divided.

• Request Base Stat ion Almana c : The base station shall respond with a “Provide Base

Station Almanac” response element in one or more response Posit ion Determin at ion

Data Messages , according to the number of parts into which the response element

is divided. If EXT_BS_ALM is set to ‘1’, the “Provide Base Station Almanac”

response element shall include the extended base station almanac; otherwise, the

“Provide Base Station Almanac” response element shall include the basic base

station almanac.

• Request GPS Alm anac: The base station shall respond with a “Provide GPS Almanac”

response element in one or more response Posit ion Determin at ion Da ta Messages ,

according to the number of parts into which the response element is divided.

• Request GPS Ephemeris: The base station shall respond with a “Provide GPS

Ephemeris” response element in one or more response Posit ion Determ inat ion Data

Messages , according to the number of parts into which the response element is

divided. If AB_PAR_REQ is set to ‘1’, the “Provide GPS Ephemeris” response element

shall include the Alpha and Beta parameters; otherwise, the “Provide GPS

Ephemeris” response element should not include the Alpha and Beta parameters.

• Request GPS Navigation Message Bits: The base station shall respond with a

“Provide GPS Navigation Message Bits” response element in one or more response

Posit ion Determin at ion Da ta Messages , according to the number of parts into which

the response element is divided. If SUBF_4_5_REQ is set to ‘1’, the “Provide GPS

Navigation Message Bits” response element shall include the subframes 4 and 5;

otherwise, the “Provide GPS Navigation Message Bits” response element shall not

include the subframes 4 and 5.

• Request Location Response : The base station shall respond with the “Provide

Location Response“ response element.

If HEIGHT_REQ is set to ‘1’, the Location response element should include

height information; otherwise, the “Provide Location Response” response

element should not include height information.


element should include clock correction for mobile station time; otherwise,

the “Provide Location Response” response element should not include clock

correction for mobile station time.




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• Request GPS Alm an ac Correction: The base station shall respond with a “Provide

GPS Almanac Correction” response element in one or more response Position



4.2.2.1.1.2

Mobile Station Response Elements Received

The base station should process and should make use of the mobile station response

elements. Upon receiving a Posit ion Determina t ion Data Message , the base station should

examine the received response elements prior to processing the request elements.



The requirements of this section apply when Posit ion Determinat ion Data Messages

addressed to individual mobile stations are to be sent by the base station andthe

destination mobile station is not on a Traffic Channel.

When the base station has to send one (or more) Posit ion Determina t ion Data Message(s) ,

and the addressed mobile station is not on a Traffic Channel, the base station shall

determine whether the Posit ion Determin at ion Data Message(s) is (are) suitable to be sent on

the Paging Channel.18 If the Posit ion Determina t ion Da ta Message(s) is (are) suitable, the

base station may form one (or more) Paging Channel Data B urst Messa ge(s) (see 7.7.2.3.2.9

of TIA/EIA-95-B), setting BURST_TYPE to ‘000101’. The base station shall set the

MSG_NUMBER and NUM_MSGS fields to 1, and shall set the NUM_FIELDS field to the

number of characters in the Posit ion Determin at ion Da ta Message(s) (as appropriate).

When a Posit ion Determina t ion Data Message is to be sent on the Paging Channel, the base

station shall send the message following the procedures specified in 7.6.2 of TIA/EIA-95-B.

The base station may send the Posit ion Determina t ion Data Message throughout the area

where the mobile is registered. Alternatively, the base station may page the mobile station

to determine which Paging Channel to use to communicate with the mobile; the base

station may use Service Option 35 or 36 in the Page Record; then, the base station may

send the Posit ion Determina t ion Data Message on the Paging Channel corresponding to the

Access Channel on which the mobile station responded. The base station may then send a

Release Ord er to the mobile station.

If the Posit ion Determin at ion Da ta Message(s) is (are) unsuitable for transmission on the

Paging Channel19, the base station shall send the Posit ion Determinat ion Data Message(s) on

the CDMA Traffic Channel, following the procedures defined in 4.2.2.3.

18 The criteria for suitability are implementation dependent.

19For example, the choice to use the Paging Channel or a Forward Traffic Channel, when

multiple Posit ion Determinat ion Data Messages are waiting to be transmitted, is

implementation dependent.

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The base station shall set the ACK_REQ Layer-2 field to ‘1’. The base station shall

guarantee the in-order delivery of Posit ion Determina t ion Data Messages .

4.2.2.1.2.2 Unsolicited Response Elements

If “Provide GPS Acquisition Assistance” is sent as an unsolicited response element, the base

station shall set CODE_PH_PAR_INCL to ‘1’ and it shall include REFERENCE_PN,

SV_CODE_PH, SV_CODE_PH_INT, GPS_BIT_NUM and SV_CODE_PH_WIN.

If “Provide GPS Location Assistance – Spherical Coordinates” or the “Provide GPS Location

Assistance – Cartesian Coordinates” is sent as an unsolicited response element, the base

station shall also send “Provide GPS Acquisition Assistance” response element in the same

Posit ion Determina t ion Data Message . The value of NUM_SV_P in each part of the “Provide

GPS Location Assistance – Spherical Coordinates” response element or the “Provide GPS

Location Assistance – Cartesian Coordinates” response element shall be the same as the

value of NUM_SV_P in the part of the “Provide GPS Acquisition Assistance” response

element that appears in the same Posit ion Determina t ion Data Message . The “Provide GPS

Location Assistance – Spherical Coordinates” response element or the “Provide GPS

Location Assistance – Cartesian Coordinates” response element shall have the satellite

related fields repeated in the same SV_PRN_NUM order as contained in the “Provide GPS

Acquisition Assistance” response element.


A “Request Autonomous Measurement Weighting Factors” shall not be issued unless a

“Request Location Response” is issued in the same Posit ion Determina t ion Data Message .

4.2.2.2 Authentication Procedures

If the mobile station includes authentication information when sending an activation

origination, the base station should process the authentication data as required in 7.3.1 of

TIA/EIA-95-B. During the position determination session, the base station should invoke

signaling message encryption whenever available, as appropriate.

4.2.2.3

Traffic Channel Procedure

4.2.2.3.1

Message Encryption

To enhance the security of the position determination session and to protect sensitive

subscriber location information, the base station should enable message encryption as

appropriate (see 7.3.2 of TIA/EIA-95-B). Encryption of the Forward and Reverse CDMA

Traffic Channel messages is defined in Annex A of TIA/EIA-95-B.

4.2.2.3.2

Negotiation for the Position Determination Service Option

Negotiation for the Position Determination Service Option is only required when no other

service option is connected.

The Position Determination Service Option described by this standard shall use service

option number 35 and is called Service Option 35 when using Multiplex Option 1. The

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Position Determination Service Option shall use service option number 36 and is called

Service Option 36 when using Multiplex Option 2.

The base station shall negotiate for Service Option 35 using service negotiation (see

4.2.2.3.2.1).

The base station shall negotiate for Service Option 36 using service negotiation (see

4.2.2.3.2.1).

4.2.2.3.2.1 Procedures Using Service Negotiation

The base station shall perform service negotiation for Service Option 35 or Service Option

36 as described in TIA/EIA-95-B. The negotiated service configuration shall include only

valid attributes for the negotiated service option consistent with those specified in Tables

3.2.3.1.2-1 and 3.2.3.1.2-2.

If the base station establishes a service configuration, as specified in a Service Connect

Message , that includes a service option connection using Service Option 35 or Service

Option 36, then the service option connection shall become part of the current service

configuration at the action time associated with the Service Connect Message . Service

Option 35 or Service Option 36 is considered to be connected when the current service

configuration includes a service option connection for it.

The base station shall not send a Service Option Contr ol Message for Service Option 35 or

Service Option 36.

4.2.2.3.3 Mobile Position Message Origination

For mobile-originated calls with no dialed digits in the Originat ion Message , the base station

should complete an authentication Unique Challenge-Response Procedure (see 6.3.12.1.5

of TIA/EIA-95-B) immediately after assigning the traffic channel. The Unique Challenge-

Response Procedure should be completed successfully before Posit ion Determin at ion Data

Messages are sent to the mobile station and before any mobile-originated Position

Determina t ion Data Messages are forwarded to other network entities.

A base station supporting Position Determination shall accept and shall process Data Burst

Messages received on the CDMA Reverse Traffic Channel (see 6.7.2.3.2.4 of TIA/EIA-95-B).

Processing of TIA/EIA-95-B Layer-2 fields shall be in accordance with TIA/EIA-95-B. Data

Burst Messages used to transport Position Determination request and response elements

shall always be acknowledged (Layer 2) and the in-order delivery over the air interface shall

be guaranteed by the transmitting entities: Mobile station and base station.

The base station shall process all Data Burst Messages received on the Reverse Traffic

Channel and having the BURST_TYPE field set to ‘000101’ (as assigned in TSB58-B). The

base station shall discard the message without further processing, if one or more of the

following is true:




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Otherwise, the base station shall process the Position Determination Data contained in the

CHARi fields of the received Data Bur st Message (see 6.7.2.3.2.4 of TIA/EIA-95-B), as

described in the next section.

If the only connected service option is Service Option 35 or Service Option 36, the base

station should release the traffic channel when no Posit ion Determin at ion Da ta Messa ges

have been received or have been sent during a period of time which is implementation-

dependent.

4.2.2.3.3.1 Mobile Station Request Elements Received

If the base station does not support the requested capability, the base station shall respond

with a “Reject” response element with the appropriate reject reason, unless the mobile

station request element is “Request BS Capabilities”; otherwise, the base station shall

include the appropriate response elements in the response Position Determination Data

(see 4.2.4) as described below. The response Position Determination Data shall reside in

the CHARi fields of the response Data Burst Message (see 7.7.3.3.2.4 of TIA/EIA-95-B).20

•

Request BS Capabil i ty: The base station shall respond with the “Provide BS

Capabilities” response element.

• Request GPS Acquisit ion Assistance: The base station shall respond with the

“Provide GPS Acquisition Assistance” response element.

If DOPP_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance” response

element shall include the Doppler 0th order term and ADD_DOPP_INCL flag;

otherwise, the “Provide GPS Acquisition Assistance” response element should

not include the Doppler 0th order term and ADD_DOPP_INCL flag.

If ADD_DOPP_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance”

response element shall include the high-order Doppler and Doppler search

window terms; otherwise, the “Provide GPS Acquisition Assistance” response

element should not include the high-order Doppler and Doppler search

window terms.

If CODE_PH_PAR_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance”

response element shall include the code phase parameters; otherwise, the


the code phase parameters.

If AZ_EL_REQ is set to ‘1’, the “Provide GPS Acquisition Assistance” response

element shall include the azimuth and elevation angles; otherwise, the


the azimuth and elevation angles.

• Request GPS Location As sist an ce: The base station shall respond with the “Provide

GPS Location Assistance – Spherical Coordinates” or with the “Provide GPS Location

Assistance – Cartesian Coordinates” response elements. If COORD_TYPE is set to


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‘1’, the base station shall provide the “Provide GPS Location Assistance – Spherical

Coordinates” response element; otherwise, the base station shall provide the

“Provide GPS Location Assistance – Cartesian Coordinates” response element. The

base station shall also send the “Provide GPS Acquisition Assistance” response

element in the same Posit ion Determin at ion Data Message that contains the “Provide

GPS Location Assistance – Spherical Coordinates” response element or the “Provide

GPS Location Assistance – Cartesian Coordinates” response element. The value of

NUM_SV_P in each part of the “Provide GPS Location Assistance – Spherical

Coordinates” response element or the “Provide GPS Location Assistance – Cartesian

Coordinates” response element shall be the same as the value of NUM_SV_P in the

part of the “Provide GPS Acquisition Assistance” response element that appears in

the same Posit ion Determinat ion Data Message . The “Provide GPS Location

Assistance – Spherical Coordinates” response element or the “Provide GPS Location

Assistance – Cartesian Coordinates” response element shall have the satellite

related fields repeated in the same SV_PRN_NUM order as contained in the “Provide

GPS Acquisition Assistance” response element.

•

Request GPS Sensitivit y Ass ista nce: The base station shall respond with a “Provide

GPS Sensitivity Assistance” response element in one or more response Position



• Request Base Stat ion Almana c : The base station shall respond with a “Provide Base

Station Almanac” response element in one or more response Posit ion Determin at ion

Data Messages , according to the number of parts into which the response element

is divided. If EXT_BS_ALM is set to ‘1’, the “Provide Base Station Almanac”

response element shall include the extended base station almanac; otherwise, the

“Provide Base Station Almanac” response element shall include the basic base

station almanac

• Request GPS Alm anac: The base station shall respond with a “Provide GPS Almanac”

response element in one or more response Posit ion Determin at ion Da ta Messages ,

according to the number of parts into which the response element is divided.

• Request GPS Ephemeris: The base station shall respond with a “Provide GPS

Ephemeris” response element in one or more response Posit ion Determina t ion Data

Messages , according to the number of parts into which the response element is

divided. If AB_PAR_REQ is set to ‘1’, the “Provide GPS Ephemeris” response element

shall include the Alpha and Beta parameters; otherwise, the “Provide GPS

Ephemeris” response element should not include the Alpha and Beta parameters.

•

Request GPS Navigation Message Bits: The base station shall respond with a

“Provide GPS Navigation Message Bits” response element in one or more response

Posit ion Determin at ion Da ta Messages , according to the number of parts into which

the response element is divided. If SUBF_4_5_REQ is set to ‘1’, the “Provide GPS

Navigation Message Bits” response element shall include the subframes 4 and 5;

otherwise, the “Provide GPS Navigation Message Bits” response element shall not

include the subframes 4 and 5.

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• Request Location Response : The base station shall respond with the “Provide

Location Response” response element.



Response” response element should not include height information


element should include clock correction for mobile station time; otherwise,

the “Provide Location Response” response element should not include clock

correction for mobile station time.




• Request GPS Alm anac Correction: The base station shall respond with a “Provide

GPS Almanac Correction” response element in one or more response Position



4.2.2.3.3.2 Mobile Station Response Elements Received

The base station should process and should make use of the mobile station response

elements. Upon receiving a Posit ion Determina t ion Data Message , the base station should

examine the received response elements prior to processing the request elements.

4.2.2.3.4 Traffic Channel Setup

When a base station is to send Position Determination data on a Traffic Channel, and the

addressed mobile station is not on a Traffic Channel, the following procedures apply.

The mobile station address shall be used for messages sent over the paging channel. The

base station shall page the mobile station and establish a Traffic Channel using the

procedures defined in 7.6 of TIA/EIA-95-B. The base station shall request Service Option

35 or Service Option 36.

When the base station enters the Conversat ion Substate, the base station may send the

Posit ion Determinat ion Data Messages in accordance with the procedures defined in

4.2.2.3.5.

4.2.2.3.5 Mobile Station Message Termination in the Conversation Substate

4.2.2.3.5.1

Position Determination Data Message Transmission Requirements

The requirements of this section shall be followed when the addressed mobile station is in

the TIA/EIA-95-B Conversat ion Substa te of the Mobile Stat ion Control on the Traff ic Cha nnel

State .

The base station shall form one (or more) Data B urst Message(s) (see 7.7.3.3.2.4 of TIA/EIA-

95-B), setting BURST_TYPE to ‘000101’ and send the message(s) on the Forward Traffic

Channel. The base station shall set the MSG_NUMBER and NUM_MSGS fields to 1 and

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shall set the NUM_FIELDS field to the number of octets in the Posit ion Determinat ion Data

message (see 4.2.4). The base station shall set the ACK_REQ Layer-2 field to ‘1’.

If the only connected service option is Service Option 35 or Service Option 36, the base

station should release the traffic channel when Posit ion Determin at ion Da ta Messages have

not been received or have not been sent during a period of time which is implementation-

dependent. If any service option in addition to Service Option 35 or Service Option 36 is

connected, the base station should initiate Service Negotiation to drop Service Option 35 or

Service Option 36 when Posit ion Determina t ion Da ta Messages have not been received or

have not been sent during a period of time which is implementation-dependent. After

sending a Posit ion Determina t ion Data Message , the base station should delay the traffic

channel release for a period of time sufficient to allow the mobile station to return any

requested acknowledgments.

4.2.2.3.5.2

Unsolicited Response Elements

If “Provide GPS Acquisition Assistance” is sent as an unsolicited response element, the base

station shall set CODE_PH_PAR_INCL to ‘1’ and it shall include REFERENCE_PN,

SV_CODE_PH, SV_CODE_PH_INT, GPS_BIT_NUM and SV_CODE_PH_WIN.

If “Provide GPS Location Assistance – Spherical Coordinates” or the “Provide GPS Location

Assistance – Cartesian Coordinates” is sent as an unsolicited response element, the base

station shall also send “Provide GPS Acquisition Assistance” response element in the same

Posit ion Determina t ion Data Message . The value of NUM_SV_P in each part of the “Provide

GPS Location Assistance – Spherical Coordinates” response element or the “Provide GPS

Location Assistance – Cartesian Coordinates” response element shall be the same as the

value of NUM_SV_P in the part of the “Provide GPS Acquisition Assistance” response

element that appears in the same Posit ion Determina t ion Data Message . The “Provide GPS

Location Assistance – Spherical Coordinates” response element or the “Provide GPS

Location Assistance – Cartesian Coordinates” response element shall have the satellite

related fields repeated in the same SV_PRN_NUM order as contained in the “Provide GPS

Acquisition Assistance” response element.


A “Request Autonomous Measurement Weighting Factors” shall not be issued unless a

“Request Location Response” is issued in the same Posit ion Determina t ion Data Message .

4.2.3

Broadcast Procedures

Reserved

4.2.4 Forward Link Message Format

The forward link Posit ion Determina t ion Data Messages are summarized in Table 4.2.4-1.

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Table 4 .2 .4 -1. Forward Link Mes sage s

Mes s age Nam e PD_MSG_TYPE


Message

‘00000000’

Reserved for future standardization ‘00000001’ through

‘10111111’

Available for manufacturer-specific


Message definition as specified in

TSB-58

‘11000000’ through

‘11111110’

Reserved ‘11111111’

The Posit ion Determina t ion Data Message from base station to mobile station has the

following variable length message format:


SESS_START 1

SESS_END 1

SESS_SOURCE 1

SESS_TAG 5

PD_MSG_TYPE (‘00000000’) 8

NUM_REQUESTS 4

NUM_RESPONSES 4

The base station shall include NUM_REQUESTS occurrences

of the following record:

RESERVED 4

REQ_TYPE 4

REQ_PAR_LEN 8

REQ_PAR_RECORD 8×REQ_PAR_LEN

The base station shall include NUM_RESPONSES


RESERVED 3

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UNSOL_RESP 1

RESP_TYPE 4

RESP_PAR_LEN 8

RESP_PAR_RECORD 8 × RESP_PAR_LEN

SESS_START – Start-of-session indicator.

If the base station has previously sent or received a

Posit ion Determinat ion Data Message related to this


2.2.1) it shall set this field to ‘0’; otherwise, it shall set


SESS_END – End-of-session indicator.

If the base station does not expect to receive or send

any more Posit ion Determina t ion Data Messages related


in 2.2.1) the base station shall set this field to ‘1’;

otherwise, it shall set this field to ‘0’. The criteria for

setting this field are implementation dependent.

SESS_SOURCE – Session-source indicator.21

If SESS_START is set to ‘1’ the base station shall set

this field to ‘0’; otherwise it shall set this field to the

same value as the SESS_SOURCE field that appeared

in a previously-received or previously-sent Position

Determina t ion Data Message that was related to this


2.2.1).

21 This field indicates which side (mobile station or base station) initiated this session.

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SESS_TAG – Session tag.

If SESS_START is set to ‘0’ the base station shall set

this field to the same value as the SESS_TAG field that

appeared in a previously-received or previously-sent

Posit ion Determin at ion Da ta Messa ge that was related


in 2.2.1); otherwise, the base station shall set this field

to one more (modulo 32) than the value it assigned to

this field in the latest Posit ion Determinat ion Data

Message that it sent with SESS_START set to ‘1’. If no

such latest Posit ion Determinat ion Data Message

exists, the base station shall set this field to ‘00000’.

The definition of “latest” is implementation dependent.

PD_MSG_TYPE – Posit ion Determin at ion Da ta Message type.

The base station shall set this field to ‘00000000’.

NUM_REQUESTS – Number of request element parameter records.

The base station shall set this field to the number of

request element parameters record included in the

message.

NUM_RESPONSES – Number of response element parameter records.


response element parameters record included in the

message.



REQ_TYPE – Request element type.

The base station shall set this field to the value shown

in Table 4.2.4-2.

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Table 4.2 .4-2. Request Eleme nt Type

DescriptionREQ_TYPE

(binary)

Reserved ‘0000’

Request MS Information ‘0010’

Request Autonomous Measurement Weighting Factors ‘0011’

Request Pseudorange Measurement ‘0100’

Request Pilot Phase Measurement ‘0101’

Request Location Response ‘0001’

Request Time Offset Measurement ‘0110’

Request Cancellation ‘0111’

All other REQ_TYPE values are reserved.

REQ_PAR_LEN – Request element parameters length.


octets included in the REQ_PAR_RECORD field.

REQ_PAR_RECORD – Request element parameters record.

The base station shall set this record as described in

4.2.4.1.


The base station shall set these bits to ‘000’.

UNSOL_RESP – Unsolicited response indicator.

The base station shall set this field to ‘1’ if the

response element is an unsolicited response element;

otherwise the base station shall set this field to ‘0’.

RESP_TYPE – Response element type.


in Table 4.2.4-3.

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Table 4.2 .4-3. Respons e Elem ent Type

DescriptionRESP_TYPE

(binary)

Reject ‘0000’

Provide BS Capabilities ‘0010’

Provide GPS Acquisition Assistance ‘0100’

Provide GPS Location Assistance – Spherical Coordinates ‘0110’

Provide GPS Location Assistance – Cartesian Coordinates ‘0111’

Provide GPS Sensitivity Assistance ‘0101’

Provide Base Station Almanac ‘0011’

Provide GPS Almanac ‘1000’

Provide GPS Ephemeris ‘1001’

Provide GPS Navigation Message Bits ‘1010’

Provide Location Response ‘0001’

Provide GPS Almanac Correction ‘1011’

All other RESP_TYPE values are reserved.

RESP_PAR_LEN – Response element parameters length.

The base station shall set RESP_PAR_LEN to the

number of octets included in the RESP_PAR_RECORD

field.

RESP_PAR_RECORD – Response element parameters record.

The base station shall set this record as described in

4.2.4.2.

4.2.4.1 Request Element Parameters Record

If REQ_TYPE in Position Determin at ion Data Message is equal to ‘0010’, or if REQ_TYPE is

equal to ‘0011’, the base station shall not include this record. If REQ_TYPE is equal to

‘0001’, or if REQ_TYPE is equal to ‘0100’, or if REQ_TYPE is equal to ‘0101’, or if REQ_TYPE

is equal to ‘0110’, or if REQ_TYPE is equal to ‘0111’, the base station shall include the

record REQ_PAR_RECORD and set its fields as described below.

If REQ_TYPE in Posit ion Determinat ion Data Message is equal to ‘0100’ (Request

Pseudorange Measurement), REQ_PAR_RECORD shall include the following fields:

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PREF_RESP_QUAL 3

NUM_FIXES 8

T_BETW_FIXES 8

OFFSET_REQ 1

RESERVED 4

PREF_RESP_QUAL – Preferred response quality.

The base station shall set this according to 3.2.2.1.1.1

and 3.2.2.3.3.1.

NUM_FIXES – Number of fixes.

The base station shall set this field to the requested

number of fixes, in the range from 1 to 255.

T_BETW_FIXES – Time between fixes.


seconds between fixes, in the range from 0 to 255.

OFFSET_REQ – Offset requested.

If REF_PN and MOB_SYS_T_OFFSET are requested,

the base station shall set this field to ‘1’; otherwise the

base station shall set this field to ‘0’.



If REQ_TYPE is equal to ‘0101’ (Request Pilot Phase Measurement), REQ_PAR_RECORD

shall include the following fields:


PREF_RESP_QUAL 3

NUM_FIXES 8

T_BETW_FIXES 8

OFFSET_REQ 1

DESI_PIL_PH_RES 1

RESERVED 3


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The base station shall set this field according to

3.2.2.1.1.1 and 3.2.2.3.3.1.







OFFSET_REQ – Offset requested.

If MOB_SYS_T_OFFSET is requested, the base station

shall set this field to ‘1’; otherwise the base station


DESI_PIL_PH_RES – Desired pilot phase resolution.

If at least one TIA/EIA-95 PN chip pilot phase

resolution is requested, the base station shall set this

field to ‘0’. If at least 1/8 TIA/EIA-95 PN chip pilot

phase resolution is requested, the base station shall

set this field to ‘1’.



If REQ_TYPE is equal to ‘0001’ (Request Location Response), REQ_PAR_RECORD shall

include the following fields:


PREF_RESP_QUAL 3

NUM_FIXES 8

T_BETW_FIXES 8

HEIGHT_REQ 1

CLK_COR_GPS_REQ 1

VELOCITY_REQ 1

RESERVED 2


The base station shall set this field according to

3.2.2.1.1.1 and 3.2.2.3.3.1.

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HEIGHT_REQ – Height information requested.

If the height information is requested, the base station



CLK_COR_GPS_REQ – Clock correction for GPS time requested.

If the clock correction for GPS time is requested, the

base station shall set this field to ‘1’; otherwise the


VELOCITY_REQ – Velocity information requested.

If velocity information is requested, the base station





If REQ_TYPE is equal to ‘0110’ (Request Time Offset Measurement), REQ_PAR_RECORD

shall include the following fields:


USE_TIME 1

ACTION_TIME 0 or 6

RESERVED 7 or 1 (as needed)

USE_TIME – Use action time indicator.

This field indicates whether an ACTION_TIME is

specified in this request element.

If an ACTION_TIME is specified in this message, the

base station shall set this field to ‘1’; otherwise, the


ACTION_TIME – Action time.

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If the USE_TIME field is set to ‘1’, the base station

shall set this field to the System Time, in units of 80

ms (modulo 64), at which the offset measurement is to

take effect. If the USE_TIME field is set to ‘0’ the base



The base station shall add reserved bits as needed in

order to make the length of the request element


octets. The base station shall set these bits to ‘0’.

If REQ_TYPE is equal to ‘0111’ (Request Cancellation), REQ_PAR_RECORD shall include

the following fields:


CANCEL_TYPE 4

RESERVED 4

CANCEL_TYPE – Cancellation type.

The base station shall set this field to the type of

request element to be cancelled, according to Table

4.4.1.1-1.



4.2.4.2 Response Element Parameters Record

The base station shall set RESP_PAR_RECORD as described below.

If RESP_TYPE in Posit ion Determinat ion Data Message is equal to ‘0000’ (Reject),



REJ_REQ_TYPE 4REJ_REASON 3

RESERVED 1

REJ_REQ_TYPE – Reject request type.

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The base station shall set this field to the value of the

REQ_TYPE corresponding to the request element it

rejects. See 3.2.4.

REJ_REASON – Reject reason.


in Table 4.2.4.2-1.

Table 4.2 .4.2 -1. Reject Reason

Reason for rejectionREJ_REASON

(binary)

Capability not supported by the base station ‘000’

Capability normally supported by the base station but

temporarily not available or not enabled

‘001’

All other REJ_REASON values are reserved.



If RESP_TYPE is equal to ‘0010’ (Provide BS Capabilities), RESP_PAR_RECORD shall

include the following fields:


BS_LS_REV 6

GPSC_ID 1

AFLTC_ID 1

APDC_ID 8

BS_LS_REV – The base station location standard revision number.


GPSC_ID – GPS capability indicator.

If the base station can do all of the following:

• provide the “GPS Assist” response elements

(“Provide GPS Acquisition Assistance”; “Provide

GPS Location Assistance – Spherical Coordinates”;

“Provide GPS Location Assistance – Cartesian

Coordinates”; “Provide GPS Sensitivity Assistance”;

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“Provide GPS Almanac”; “Provide GPS Ephemeris”;

“Provide GPS Navigation Message Bits”), and

• determine the position of the mobile station based

on information provided by the mobile station

through the GPS response elements (“Provide

Autonomous Measurement Weighting Factors”;

“Provide Pseudorange Measurement”), and

• accept a “Provide Location Response” response

element from the mobile station with autonomous

positioning technology,

then the base station shall set this field to ‘1’;


AFLTC_ID – Advanced forward link trilateration capability

indicator.


• provide the “Provide Base Station Almanac”

response element, and

• determine the position of the mobile station based

on information provided by the mobile station

through the “Provide Pilot Phase Measurement”

response element, and

• accept a “Provide Location Response” response



then the base station shall set this field to ‘1’;


APDC_ID – Autonomous position determination capability

indicator.


• determine the position of the mobile station

autonomously (i.e., without mobile station

involvement), and

•

accept a “Provide Location Response” response



then the base station shall set this field to a value

other than ‘00000000’ according to Table 4.2.4.2-2;

otherwise the base station shall set this field to

‘00000000’.

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Table 4.2 .4.2 -2. Auton omo us Location Dete rminat ion Capabil ity in the Base Station

APDC_ID Loc at ion Dete rm in at ion Capabilit y

‘00000000’No Autonomous Location Determination

Capability

‘00000001’ – ‘11111111’ Autonomous Location Technology Identifier

If RESP_TYPE is equal to ‘0100’ (Provide GPS Acquisition Assistance), RESP_PAR_RECORD



NUM_SV 4

TIME_OF_APP 8

DOPP_INCL 1

ADD_DOPP_INCL 0 or 1

CODE_PH_PAR_INCL 1

REFERENCE_PN 0 or 10

AZ_EL_INCL 1

The base station shall include NUM_SV occurrences of the

following fields:

SV_PRN_NUM 6DOPPLER0 0 or 12

DOPPLER1 0 or 7

DOPPLER_WIN 0 or 3

SV_CODE_PH 0 or 10

SV_CODE_PH_INT 0 or 5

GPS_BIT_NUM 0 or 2

SV_CODE_PH_WIN 0 or 5

AZIMUTH 0 or 5

ELEVATION 0 or 3


NUM_SV – Number of GPS satellites.

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repeated data fields for all applicable satellites, in the



TIME_OF_APP – The CDMA system time reference for the GPS

Acquisition Assist information.

The base station shall set this field to the CDMA

system time reference, in units of 1.28 s, in the range

from 0 to 318.72 s.

DOPP_INCL – Doppler (0th order) term included.

If DOPPLER0 is included in this response element, the

base station shall set this field to ‘1’; otherwise the


ADD_DOPP_INCL – Additional Doppler information included.

If DOPP_INCL is set to ‘1’, the base station shall

include this field and, if DOPPLER1 and

DOPPLER_WIN are included in this response element,

it shall set ADD_DOPP_INCL to ‘1’; if DOPPLER1 and

DOPPLER_WIN are not included in this response

element, it shall set ADD_DOPP_INCL to ‘0’. If

DOPP_INCL is set to ‘0’, the base station shall not

include this field.

CODE_PH_PAR_INCL – Code phase information included.

If code phase information is included in this response

element, the base station shall set this field to ‘1’. If

code phase information is not included in this

response element, the base station shall set this field

to ‘0’.

REFERENCE_PN – Reference PN.

If CODE_PH_PAR_INCL is set to ‘1’, the base station

shall include this field and set the most significant bit

of this field to ‘0’ and the 9 least significant bits of this

field to the PN sequence offset of the pilot used as time

reference by the base station for the SV_CODE_PH

information included in this element, relative to the

zero offset pilot PN sequence in units of 64 PN chips.

If the SV_CODE_PH information included in this

element does not use any pilot PN sequence as its

reference, then the base station shall set this field to

‘1000000000’. See Table 4.2.4.2-3. If

CODE_PH_PAR_INCL is set to ‘0’, the base station


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Table 4.2 .4.2 -3 . Referen ce PN

REFERENCE_PN

(binary)

PN se quence offse t value

‘0xxxxxxxxx’ ‘xxxxxxxxx’

‘1000000000’ No Pilot PN sequence used as reference

All other REFERENCE_PN values are reserved.

AZ_EL_INCL – Azimuth and elevation angle included.

If azimuth and elevation angle are included in this

response element, the base station shall set this field

to ‘1’. If azimuth and elevation angle are not included

in this response element, the base station shall set


SV_PRN_NUM – The satellite PRN number.






DOPPLER0 – The 0th order Doppler.

If DOPP_INCL is set to ‘1’, the base station shall set

this field to the two’s complement value of the 0th order

Doppler, in units of 2.5 Hz, in the range from -5120 Hz

to +5117.5 Hz; otherwise the base station shall not

include this field.

Note: Generally, this value is obtained from a

specification of the associated parameter that has a

larger number of bits of resolution. These values shall

be obtained by simple truncation without round-off.

DOPPLER1 – The 1st order Doppler.

If ADD_DOPP_INCL is included and set to ‘1’, the base


value of the 1st order Doppler, in units of 1/64 Hz/s, in

the range from -1 Hz/s to +63/64 Hz/s; otherwise the

base station shall not include this field.

DOPPLER_WIN – The Doppler search window.

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If ADD_DOPP_INCL is included and ADD_DOPP_INCL

is set to ‘1’, the base station shall set this field to

represent the Doppler search window as specified in

Table 4.2.4.2-4; otherwise the base station shall not

include this field.

Table 4.2 .4 .2 -4. DOPPLER_WIN Parame te r Form at

DOPPLER_WIN Do pple r S earc h Win dow

‘000’ 200 Hz

‘001’ 100 Hz

‘010’ 50 Hz

‘011’ 25 Hz

‘100’ 12.5 Hz

All other values of DOPPLER_WIN are reserved.

SV_CODE_PH – The GPS code phase.

If CODE_PH_PAR_ INCL is set to ‘1’, the base station

shall include this field and set this field to the code

phase in GPS chip, in the range from 0 to 1022 GPS

chips; otherwise, the base station shall not include

this field.

SV_CODE_PH_INT – The integer number of code periods that have elapsed

since the latest GPS bit boundary.


shall set this field to number of the code periods that

have elapsed since the latest GPS bit boundary, in

units of C/A code period, in the range from 0 to 19;

otherwise the base station shall not include this field.

GPS_BIT_NUM – The two least significant bits of the bit number (within

the GPS frame) being currently transmitted.


shall set this field to represent the two least significant

bits of the bit number being received at TIME_OF_APP

in the range from 0 to 3; otherwise the base station


SV_CODE_PH_WIN – The total code phase window.


shall set this field to represent the two sided code

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phase search window as specified in Table 4.2.4.2-5;


Table 4 .2.4 .2-5. Code Phase Se arch Window Parame ter Format

SV_CODE_PH_WIN Code Phase Search Window

(GPS c hips )

‘00000’ 1023

‘00001’ 1

00010’ 2

‘00011’ 3

‘00100’ 4

‘00101’ 5‘00110’ 6

‘00111’ 8

‘01000’ 10

‘01001’ 12

‘01010’ 14

‘01011’ 18

‘01100’ 22

‘01101’ 26

‘01110’ 30

‘01111’ 38

‘10000’ 46

‘10001’ 54

‘10010’ 62

‘10011’ 78

‘10100’ 94

‘10101’ 110

‘10110’ 126

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‘10111’ 158

‘11000’ 190

‘11001’ 222

‘11010’ 254‘11011’ 318

‘11100’ 382

‘11101’ 446

‘11110’ 512

‘11111’ 640

AZIMUTH – Azimuth of the GPS satellite.

If AZ_EL_ INCL is set to ‘1’, the base station shall set

this field to the azimuth, in units of 11.25 degrees, in

the range from 0 to 348.75 degrees; otherwise the base






ELEVATION – Elevation angle of the GPS satellite.

If AZ_EL_ INCL is set to ‘1’, the base station shall set

this field to the elevation angle, in units of 11.25

degrees, in the range from 0 to 78.75 degrees;











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If RESP_TYPE is equal to ‘0110’ (Provide GPS Location Assistance – Spherical Coordinates),



LAT_REF 20

LONG_REF 20

HEIGHT_REF 7

NUM_DLY 3

NUM_SV 4

The base station shall include NUM_DLY occurrences of the

following fields:

PILOT_PN 9

DLY_ONEWAY 11


following fields:

DOPPLER0_LSB 4

SV_CODE_PH_FR 10

AZIMUTH_LSB 11

ELEVATION_LSB 11


LAT_REF – Reference latitude.

The base station shall set this field to the two’s

complement value of the latitude, in units of 180/220


)

degrees, referenced to the WGS-84 reference ellipsoid,

counting positive angles north of the equator and

negative angles south of the equator.

LONG_REF – Reference longitude.


complement value of the longitude, in units of 360/220


+180×(1-2-19

) degrees, referenced to the WGS-84

reference ellipsoid, counting positive angles east of the

Greenwich meridian and negative angles west of the

Greenwich meridian.

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HEIGHT_REF – Reference height.

The base station shall set this field to the reference

height , in units of 40 m, in the range from -400 m to

+4680 m.

Note that the reference height is defined as the height

above the WGS-84 reference ellipsoid.

NUM_DLY – Number of delays.


repeated data fields for all applicable PN offsets, in the

range from 0 to 7.





conveys the number of satellites minus one .

PILOT_PN – Pilot PN sequence offset index.

The base station shall set this field to the pilot PN

sequence offset for the base station, in units of 64

TIA/EIA-95 PN chips.

DLY_ONEWAY – One way delay.

The base station shall set this field to the one way

delay, in units of 1/16 TIA/EIA-95 PN chips, in the

range from 0 to 127.9375 chips.

DOPPLER0_LSB – The LSB’s of the 0th order term Doppler. This field is a

resolution extension of DOPPLER0 in a “Provide GPS

Acquisition Assistance” response element. When

appended to the bit representation DOPPLER0 in a

“Provide GPS Acquisition Assistance” response element

included in the same Posit ion Determinat ion Data

Message , it provides higher-resolution version of the

0th order term Doppler.

The base station shall set this field to the LSB’s of the

0th order Doppler, in units of 2.5/2

4 Hz, in the range

from 0 to 2.5×(1-2-4) Hz.

SV_CODE_PH_FR – The fractional chip of code phase. This field is a

resolution extension of SV_CODE_PH in “Provide GPS


appended to the chip representation SV_CODE_PH in

“Provide GPS Acquisition Assistance” response

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element, it provides higher-resolution version of the

code phase.

The base station shall set this field to the fractional

chip of code phase, in units of 2 -10 GPS chips, in the

range from 0 to (1- 2-10

) chips.

AZIMUTH_LSB – The LSB’s of the azimuth. This field is a resolution

extension of AZIMUTH in a “Provide GPS Acquisition

Assistance” response element. When appended to the

bit representation AZIMUTH in a “Provide GPS

Acquisition Assistance” response element included in

the same Posit ion Determinat ion Data Message , it

provides higher-resolution version of the azimuth.


azimuth, in units of 11.25/211 degrees, in the range

from 0 to 11.25×(1-2-11

) degrees.

ELEVATION_LSB – The LSB’s of the elevation angle. This field is a

resolution extension of ELEVATION in a “Provide GPS


appended to the bit representation ELEVATION in a

“Provide GPS Acquisition Assistance” response element

included in the same Posit ion Determinat ion Data

Message , it provides higher-resolution version of the

elevation angle.


elevation angle, in units of 11.25/211 degrees, in the

range from 0 to 11.25×(1-2-11) degrees.






If RESP_TYPE is equal to ‘0111’ (Provide GPS Location Assistance – Cartesian Coordinates),



NUM_DLY 3

NUM_SV 4

The base station shall include NUM_DLY occurrences of the

following fields:

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PILOT_PN 9

DLY_ONEWAY 11


following fields:

DOPPLER0_LSB 4

SV_COOR_X 27

SV_COOR_Y 27

SV_COOR_Z 27


NUM_DLY – Number of delays.


repeated data fields for all applicable PN offsets, in the

range from 0 to 7.








sequence offset for the base station, in units of 64

TIA/EIA-95 PN chips.

DLY_ONEWAY – One way delay.

The base station shall set this field to the One way

delay, in units of 1/16 TIA/EIA-95 PN chips, in the

range from 0 to 127.9375 chips.

DOPPLER0_LSB – This field is a resolution extension of DOPPLER0 in a

“Provide GPS Acquisition Assistance” response

element. When appended to the bit representation

DOPPLER0 in a “Provide GPS Acquisition Assistance”

response element included in the same Position

Determinat ion Data Message , it provides higher-

resolution version of the 0th order term Doppler.


0th order Doppler, in units of 2.5/24 Hz, in the range

from 0 to 2.5×(1-2-4) Hz.

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SV_COOR_X – The X coordinate of the satellite in ECEF format.


complement of the X coordinate of the satellite, in

units of 0.4125 m, in the range from -0.4125×226 m to

0.4125×(226 - 1) m.

SV_COOR_Y – The Y coordinate of the satellite in ECEF format.


complement of the Y coordinate of the satellite, in


0.4125×(226 - 1) m.

SV_COOR_Z – The Z coordinate of the satellite in ECEF format.


complement of the Z coordinate of the satellite, in


0.4125×(226

- 1) m.






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If RESP_TYPE is equal to ‘0101’ (Provide GPS Sensitivity Assistance), RESP_PAR_RECORD



REF_BIT_NUM 11

NUM_DR_P 4

DR_SIZE 8

PART_NUM 3

TOTAL_PARTS 3

The base station shall include NUM_DR_P occurrences of the

following record of (NUM_SV_DR+2) fields:

NAV_MSG_BITS 2 × DR_SIZE

NUM_SV_DR 4

The base station shall include NUM_SV_DR occurrences of

the following field:

SV_PRN_NUM 6


REF_BIT_NUM – The reference bit number.

This parameter conveys the position of a particular bit

in the 1500-bit GPS frame to be called the “reference

bit”, which is the last bit of the first half of the

NAV_MSG_BITS field. The base station shall set this

field to the position of the reference bit in the range

from 0 to 1499.

NUM_DR_P – Number of data records in this part.

The base station shall set this field to specify the

number of repeated records in this part of the

response element, in the range from 0 to 15.

DR_SIZE – Data record size.

The base station shall set this field to specify the data

record size in 2-bit units, in the range from 0 to 510

bits.

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The base station shall set this field to specify the part

number of the GPS Sensitivity Assistance data, in the

range from 1 to TOTAL_PARTS.


The base station shall set this field to specify the total

number of parts that the GPS Sensitivity Assistance

data is divided into, in the range from 1 to 8.

NAV_MSG_BITS – Navigation message bits.


Navigation message bits.

NUM_SV_DR – Number of GPS satellites in this data record.


repeated data fields for all applicable satellites in this

data record, in the range from 1 to 16, where the

binary value of the field conveys the number of

satellites minus one.












If RESP_TYPE is equal to ‘0011’ (Provide Base Station Almanac), RESP_PAR_RECORD shall


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REF_PN 9

TIME_CRRCTION_REF 9

LAT_REF 23

LONG_REF 24

HEIGHT_REF 10

PART_NUM 3

TOTAL_PARTS 3

NUM_PILOTS_P 9

The base station shall include NUM_PILOTS_P occurrences of

the following six-field record:

PILOT_PN 9

TIME_CORRECTION 9

LOC_SAME_AS_PREV 1

DELTA_LAT 0 or 16

DELTA_LONG 0 or 16

HEIGHT 0 or 10


REF_PN – Pilot PN sequence offset of the reference base station.


sequence offset of the pilot transmitted by the

reference base station with respect to which locations

of other base stations are reported, relative to the zero

offset pilot PN sequence in units of 64 PN chips.

TIME_CRRCTION_REF– Reference time correction.


complement value of the reference time correction of

the base station transmitting pilot REF_PN in units of

1/16 TIA/EIA-95 PN chips, in the range from -16 to

+15.9375 chips.

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LAT_REF – Reference latitude.

The base station shall set this field to the latitude of the

base station antenna transmitting pilot REF_PN,

referenced to the WGS-84 reference ellipsoid, in units

of 0.125” (arc seconds), expressed as a two’s complement

signed number with positive numbers signifying north

latitudes. The base station shall set this field to a value

in the range from –324000” to 324000” inclusive

(corresponding to the range from -90° to +90°).

LONG_REF – Reference longitude.

The base station shall set this field to the longitude of the

base station antenna transmitting pilot REF_PN,

referenced to the WGS-84 reference ellipsoid, in units

of 0.125” (arc seconds), expressed as a two’s complement

signed number with positive numbers signifying east

longitudes. The base station shall set this field to a value

in the range from –648000” to 648000” inclusive

(corresponding to the range from -180° to +180°).

HEIGHT_REF – Reference height.

The base station shall set this field to the height, above

the WGS-84 reference ellipsoid, of the base station

antenna transmitting pilot REF_PN, in units of 4 m, in

the range from 0 to 4092 m.



number of the Base Station Almanac data, in the

range from 1 to TOTAL_PARTS.



number of parts that the Base Station Almanac data is

divided into, in the range from 1 to 8.

NUM_PILOTS_P – Number of pilots in this part.


pilots to be reported in this part of the response

element, in the range from 0 to 511.



sequence offset of the pilot transmitted by the base

station whose location is being reported, relative to the

zero offset pilot PN sequence in units of 64 PN chips.

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TIME_ CORRECTION – The (GPS) reference time correction for Pilot PILOT_PN.


complement value of the reference time correction of

the base station antenna transmitting pilot PILOT_PN,

in units of 1/16 TIA/EIA-95 PN chips, expressed as a

two’s complement signed number in the range from

-16 to +15.9375 chips.

LOC_SAME_AS_PREV– Location same as the previous.

If the location of the base station antenna transmitting

this pilot PN is the same as the location of the previous

base station antenna, the base station shall set this

field to ‘1’; otherwise, the base station shall set this

field to ‘0’.

DELTA_LAT – The difference in the latitude of this base station

antenna and the latitude of the reference base station

antenna.

If LOC_SAME_AS_PREV is set to ‘0’, the base station shall

set this field to the difference in the latitude of the base

station antenna transmitting pilot PILOT_PN and the

latitude of the reference base station antenna (latitude

of base station antenna transmitting pilot PILOT_PN

minus latitude of reference base station antenna) with

both latitudes referenced to the WGS-84 reference

ellipsoid, in units of 0.125 s, expressed as a two’s

complement signed number in the range from -1024 s

to +1023.875 s; otherwise, the base station shall omit

this field.

DELTA_LONG – The difference in the longitude of this base station

antenna and the longitude of the primary base station

antenna.

If LOC_SAME_AS_PREV is set to ‘0’, the base station shall

set this field to the difference in the longitude of the

base station antenna transmitting PILOT_PN and the

longitude of the reference base station antenna

(longitude of base station antenna transmitting pilot

PILOT_PN minus longitude of reference base station

antenna) with both longitudes referenced to the

WGS-84 reference ellipsoid, in units of 0.125 s,

expressed as a two’s complement signed number in the

range from -1024 s to +1023.875 s; otherwise, the base

station shall omit this field.

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HEIGHT – The height of the base station antenna.

The base station shall set this field to the height, above

the WGS-84 reference ellipsoid, of the base station

antenna transmitting pilot PILOT_PN, in units of 4 m,

in the range form 0 to 4092 m.






If RESP_TYPE is equal to ‘1000’ (Provide GPS Almanac), RESP_PAR_RECORD shall include

the following record:


NUM_SV_P 6

WEEK_NUM 8

TOA 8

PART_NUM 5

TOTAL_PARTS 5

The base station shall include NUM_SV_P occurrences of the

following ten-field record:

SV_PRN_NUM 5

DELTA_INCLINATION 16

MO 24

ECCENTRICITY 16

A_SQRT 24

OMEGA_0 24

OMEGA 24

OMEGADOT 16

AF1 11

AF0 11


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NUM_SV_P – Number of satellites in this part.


number of repeated records for all applicable satellites

in this part of response element, in the range from 1 to

64, where the binary value of the field conveys the

number of satellites minus one.

WEEK_NUM – The GPS week number of the almanac.

The base station shall set this field to the 8 least


almanac22 from which parameters in this message are

obtained. The range for this field is from 0 to 255.

TOA – The reference time of the almanac.


reference time of the almanac22 from which parameters

in this message are obtained, in units of 4096 s, in the

range from 0 to 602,112 s.



number of the Almanac data, in the range from 1 to

TOTAL_PARTS.



number of parts that the Almanac data is divided into,

in the range from 1 to 32.







DELTA_INCLINATION– Correction to inclination.

The base station shall set this field to the value

contained in the associated parameter of the specified

GPS almanac22

.

22 This parameter is as defined in ICD200

(http://www.navcen.uscg.mil/gps/geninfo/gpsdocuments/icd200/default.htm).

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M0 – Mean anomaly at reference time.



GPS almanac22

.

ECCENTRICITY – Eccentricity.



GPS almanac22

.

A_SQRT – Square root of the semi-major axis.



GPS almanac22

.

OMEGA_0 – Longitude of ascending node of orbit plane at weekly

epoch.



GPS almanac22

.

OMEGA – Argument of perigee.



GPS almanac22

.

OMEGADOT – Rate of right ascension.



GPS almanac22

.

AF1 – Apparent satellite clock correction af1.



GPS almanac22

.




GPS almanac22

.






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If RESP_TYPE is equal to ‘1001’ (Provide GPS Ephemeris), RESP_PAR_RECORD shall



NUM_SV_P 4

PART_NUM 5

TOTAL_PARTS 5

AB_PAR_INCL 1

ALPHA_0 0 or 8

ALPHA_1 0 or 8

ALPHA_2 0 or 8

ALPHA_3 0 or 8

BETA_0 0 or 8

BETA _1 0 or 8

BETA _2 0 or 8

BETA _3 0 or 8


following twenty-two-field record:

SV_PRN_NUM 5

IODE 8

C_RS 16

DELTA_N 16

M0 32

C_UC 16

ECCENTRICITY 32

C_US 16

A_SQRT 32

TOE 16

C_IC 16

OMEGA_0 32

C_IS 16

ANGLE_INCLINATION 32

C_RC 16

OMEGA 32

OMEGADOT 24

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IDOT 14

TOC 16

AF2 8

AF1 16

AF0 22




number of repeated records for all applicable satellites

in this part of the response element, in the range from

1 to 16, where the binary value of the field conveys the

number of satellites minus one.



number of the Ephemeris data, in the range from 1 to

TOTAL_PARTS.



number of parts that the Ephemeris data is divided

into, in the range from 1 to 32.

AB_PAR_INCL – Inclusion of the alpha and beta parameters.

The base station shall set this field to ‘1’ if the alpha

and beta parameters are included in the response

element; otherwise the base station shall set this field

to ‘0’.

ALPHA_0 – Ionospheric correction parameter α0.

If AB_PAR_INCL is set to ‘1’, the base station shall set

this field to the value contained in the associated

parameter of the specified GPS ephemeris23; otherwise

the base station shall not include this field.

23 This parameter is as defined in ICD200

(http://www.navcen.uscg.mil/gps/geninfo/gpsdocuments/icd200/default.htm).

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BETA_0 – Ionospheric correction parameter β0.








parameter of the specified GPS ephemeris23

; otherwise
















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IODE – Issue of data.



GPS ephemeris23.

C_RS – Amplitude of the sine harmonic correction term to the

orbit radius.



GPS ephemeris23.

DELTA_N – Mean motion difference from the computed value.



GPS ephemeris23.

M0 – Mean anomaly at the reference time.



GPS ephemeris23.

C_UC – Amplitude of the cosine harmonic correction term to

the argument of latitude.



GPS ephemeris23.

ECCENTRICITY – Eccentricity.



GPS ephemeris23.

C_US – Amplitude of the sine harmonic correction term to the

argument of latitude.



GPS ephemeris23.

A_SQRT – Square root of the semi-major axis.



GPS ephemeris23.

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TOE – ephemeris reference time.



GPS ephemeris23.

C_IC – Amplitude of the cosine harmonic correction term to

the angle of inclination.



GPS ephemeris23.

OMEGA_0 – Longitude of ascending node of orbit plane at weekly

epoch.



GPS ephemeris23.

C_IS – Amplitude of the sine harmonic correction term to the

angle of inclination.



GPS ephemeris23.

ANGLE_INCLINATION– Inclination angle at the reference time.



GPS ephemeris23.

C_RC – Amplitude of the cosine harmonic correction term to

the orbit radius.



GPS ephemeris23.

OMEGA – Argument of perigee.



GPS ephemeris23.

OMEGADOT – Rate of right ascension.



GPS ephemeris23.

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IDOT – Rate of inclination angle.



GPS ephemeris23.

TOC – Clock data reference time.



GPS ephemeris23.




GPS ephemeris23.




GPS ephemeris23.




GPS ephemeris23.






If RESP_TYPE is equal to ‘1010’ (Provide GPS Navigation Message Bits),



NUM_SV_P 6

PART_NUM 5

TOTAL_PARTS 5

SUBF_4_5_INCL 1

SUBF_4_5 0 or 15000


following two-field record:

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SV_PRN_NUM 6

SUB_1_2_3 900




repeated records for all applicable satellites in this part

of the response element, in the range from 1 to 64,

where the binary value of the field conveys the number

of satellites minus one.



number of the GPS Navigation Message Bits data, in




number of parts that the GPS Navigation Message Bits

data is divided into, in the range from 1 to 32.

SUBF_4_5_INCL – Inclusion of the additional parameters indicator.

The base station shall set this field to ‘1’ if the

subframes 4 and 5 are included in the response

element; otherwise the base station shall set this field

to ‘0’.

SUBF_4_5 – GPS subframes 4 and 5.

If SUBF_4_5_INCL is set to ‘1’, the base station shall

set this field to the contents of GPS navigation

message subframes 4 and 5; otherwise the base


Note that the data shall be current as of the time of

transmission; time-dependent fields shall be

represented as they will occur in the next whole frame

(for subframes 1, 2 and 3) or in the next whole

superframe (for subframes 4 and 5) from the time the

request is received by the base station.




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SUBF_1_2_3 – The subframes 1, 2 and 3.

The base station shall set this field to the contents of

GPS navigation message subframes 1, 2 and 3

transmitted by the satellite specified in the previous

field.

Note that the data shall be current as of the time of

transmission; time-dependent fields shall be

represented as they will occur in the next whole frame

(for subframes 1, 2 and 3) or in the next whole

superframe (for subframes 4 and 5) from the time the

request is received by the base station.






If RESP_TYPE is equal to ‘0001’ (Provide Location Response), RESP_PAR_RECORD shall


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TIME_REF_CDMA 14

LAT 25

LONG 26

LOC_UNCRTNTY_ANG 4

LOC_UNCRTNTY_A 5

LOC_UNCRTNTY_P 5

FIX_TYPE 1

VELOCITY_INCL 1

VELOCITY_HOR 0 or 9

HEADING 0 or 10

VELOCITY_VER 0 or 8

CLOCK_INCL 1

CLOCK_BIAS 0 or 18

CLOCK_DRIFT 0 or 16

HEIGHT_INCL 1

HEIGHT 0 or 14

LOC_UNCRTNTY_V 0 or 5



The base station shall set this field to (t/50 mod






LAT – Latitude.


complement value of the latitude, referenced to the

WGS-84 reference ellipsoid, in units of 180/225


)

degrees, counting positive angles north of the equator

and negative angles south of the equator.

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LONG – Longitude.


complement value of the longitude, referenced to the

WGS-84 reference ellipsoid, in units of 360/226


+180×(1-2-25) degrees, counting positive angles east of

the Greenwich meridian and negative angles west of

the Greenwich meridian.

LOC_UNCRTNTY_ANG– Angle of axis with respect to True North for position

uncertainty.

The base station shall set this field to the angle of axis

for position uncertainty, in units of 5.625 degrees, in

the range from 0 to 84.375 degrees, where 0 degrees is

True North and the angle increases toward the East.

LOC_UNCRTNTY_A – Standard deviation of axis along angle specified for

position uncertainty.

The base station shall set this field to represent the

standard deviation of axis along angle specified for

position uncertainty as specified in Table 4.2.4.2-6.

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Table 4 .2.4 .2-6. Posit ion Unc ertainty

LOC_UNCRTNTY Stan dard Deviat ion for

Posit ion Uncertainty

(meters)

‘00000’ 0.5

‘00001’ 0.75

‘00010’ 1

‘00011’ 1.5

‘00100’ 2

‘00101’ 3

‘00110’ 4

‘00111’ 6

‘01000’ 8

‘01001’ 12

‘01010’ 16

‘01011’ 24

‘01100’ 32

‘01101’ 48

‘01110’ 64

‘01111’ 96

‘10000’ 128

‘10001’ 192

‘10010’ 256

‘10011’ 384

‘10100’ 512

‘10101’ 768

‘10110’ 1,024‘10111’ 1,536

‘11000’ 2,048

‘11001’ 3,072

‘11010’ 4,096

‘11011’ 6,144

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‘11100’ 8,192

‘11101’ 12,288

‘11110’ >12,288

‘11111’ Not computableLOC_UNCRTNTY_P – Standard deviation of axis perpendicular to angle

specified for position uncertainty.

The base station shall set this field to represent the

Standard Deviation of Axis Perpendicular to Angle

Specified for Position Uncertainty as specified in Table

4.2.4.2-6.

FIX_TYPE – Fix type.

The base station shall set this field to ‘0’ for 2D fix and

to ‘1’ for 3D fix.

VELOCITY_INCL – Velocity information included.

If velocity information is included in this response


velocity information is not included in this response

element, the base station shall set this field to ‘0’.

VELOCITY_HOR – Horizontal velocity magnitude.

If VELOCITY_INCL is set to ‘1’, the base station shall

set this field to the horizontal velocity, in units of 0.25

m/s, in the range from 0 to 127.75 m/s; otherwise the

base station shall not include this field.




HEADING – Heading.

If VELOCITY_INCL is set to ‘1’, the base station shall

set this field to Heading, in units of 360/210 degrees, in

the range from 0 to 360×(1-2-10

) degrees; otherwise the

base station shall not include this field, where 0

degrees is True North and the angle increases toward

the East.




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VELOCITY_VER – Vertical velocity.

If VELOCITY_INCL and FIX_TYPE are set to ‘1’, the

base station shall set this field to the two’s

complement value of Vertical Velocity, in units of 0.5

m/s, in the range from -64 m/s to +63.5 m/s;





CLOCK_INCL – Clock information included.

If clock information is included in this response


clock information is not included in this response

element, the base station shall set this field to ‘0’.

CLOCK_BIAS – Clock bias.

If CLOCK_INCL is set to ‘1’, the base station shall set

this field to the clock bias in ns, in the range from

-13,000 ns to +249,143 ns; otherwise the base station

shall not include this field. This parameter is

computed as true GPS time minus mobile station time

reference as defined in TIA/EIA-95.

Note that as part of a GPS fix, the computation yields

an estimate of the discrepancy between the time

specified by the local clock and true GPS time. This

parameter reports the discrepancy. The main cause of

this discrepancy is going to be the propagation delay

from the base station to the MS, which is always

positive. Accordingly, the range allowed for this

parameter is not symmetric.

CLOCK_DRIFT – Clock drift.

If CLOCK_INCL is set to ‘1’, the base station shall set

this field to the two’s complement value of the rate of

change of clock bias in units of ppb (ns/s), in the

range from -32768 ppb (ns/s) to +32767 ppb (ns/s);


HEIGHT_INCL – Height information included.

If height information is included in this response


HEIGHT is not included in this response element, the


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HEIGHT – Height.

If HEIGHT_INCL is set to ‘1’, the base station shall set

this field to the height, above WGS-84 reference

ellipsoid, in units of 1 meter, in the range from -500 m

to 15833 m; otherwise it shall not include this field.

LOC_UNCRTNTY_V – Standard deviation of vertical error for position

uncertainty.

If HEIGHT_INCL is set to ‘1’, the base station shall

include this field and set this field to represent the

Standard Deviation Vertical Error for Position

Uncertainty as specified in Table 4.2.4.2-6; otherwise










If RESP_TYPE is equal to ‘1011’ (Provide GPS Almanac Correction), RESP_PAR_RECORD



NUM_SV_P 4

REF_TIME 8

TOA 8

WEEK_NUM 8

PART_NUM 5

TOT_PARTS 5


following fields:

SV_PRN_NUM 5

DELTA_XYZ_INCL 1

DELTA_X 0 or 15

DELTA_Y 0 or 15

DELTA_Z 0 or 15

DELTA_X_1ST

0 or 7

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DELTA_Y_1ST

0 or 7

DELTA_Z_1ST

0 or 7

DELTA_CLOCK_INCL 1

DELTA_CLOCK 0 or 17

DELTA_CLOCK_1ST 0 or 8


NUM_SV_P – Number of satellites in the part.


satellites in this part of the response element, in the



REF_TIME – The time of validity of the parameters reported in this

response element.

The base station shall set this field to the time of

validity of these almanac corrections.

The base station shall set this field to (t/1280 mod

250), where t is the GPS time of validity of the

corrections in units of 1 ms.

TOA – Time of almanac.


reference time of the almanac from which parameters

in this message are obtained, in units of 4096 s, in the

range from 0 to 602,112 s.

WEEK_NUM – GPS week number.

The base station shall set this field to the 8 least


almanac for which the almanac corrections are

provided. The range for this field is from 0 to 255.

PART_NUM – Part number.


the current part in the response element, in the range

from 1 to 32.

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TOT_PARTS – Total parts.

The base station shall set this field to the total number

of parts that constitute the response element, in the

range from 1 to 32.







DELTA_XYZ_INCL – Correction for XYZ included.

The base station shall set this field to ‘1’ if delta XYZ

information is included in the message; otherwise it

shall set this field to ‘0’.24

DELTA_X – Correction for X coordinate.

If DELTA_XYZ_INCL is set to ‘1’ the base station shall

include DELTA_X and set this field to the two’s

complement value of the 0th order position correction X

term, in units of 0.5 m, in the range from -8192 m to

+8191.5 m; otherwise the base station shall not

include this field24.

DELTA_Y – Correction for Y coordinate.


include DELTA_Y and set this field to the two’s

complement value of the 0th order position correction Y




DELTA_Z – Correction for Z coordinate.


include DELTA_Z and set this field to the two’s

complement value of the 0th order position correction Z




24 See 3.2.2.1.1.2 and 3.2.2.3.3.2

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DELTA_X_1ST – 1st order correction for X coordinate.


include DELTA_X_1ST and set this field to the two’s

complement value of the 1st order position correction X

term, in units of 2.5 cm/s, in the range from -160

cm/s to +157.5 cm/s; otherwise the base station shall

not include this field.

DELTA_Y_1ST – 1st order correction for Y coordinate.


include DELTA_Y_1ST and set this field to the two’s

complement value of the 1st order position correction Y




DELTA_Z_1ST – 1

st

order correction for Z coordinate.


include DELTA_Z_1ST and set this field to the two’s

complement value of the 1st order position correction Z




DELTA_CLOCK_INCL – Correction for clock included.

The base station shall set this field to ‘1’ if delta clock

information is included in the message; otherwise it


DELTA_CLOCK – Correction for clock.

If DELTA_CLOCK_INCL is set to ‘1’ the base station

shall include DELTA_CLOCK and set this field to the

two’s complement value of the delta clock 0th order, in

units of 1 ns, in the range from -65536 ns to

65535 ns; otherwise the base station shall not include

this field.

DELTA_CLOCK_1ST – 1st order correction for clock.

If DELTA_CLOCK_INCL is set to ‘1’ the base station

shall include DELTA_CLOCK_1ST and set this field to

the two’s complement value of the delta clock 1st order,

in units of 0.1 ppb, in the range from -12.8 ppb to

+12.7 ppb; otherwise the base station shall not include

this field.

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Ann ex A - TIMERS

The following table provides values for time limits given in the text.

Table A-1. Time Lim its

Time

LimitDe s cript ion Value Refe re n c es

T 1 Time limit for preferred quality of “Provide Pseudorange

Measurement”, “Provide Pilot Phase Measurement” and

“Provide Location Response” response elements when

PREF_RESP_QUAL = ‘000’

2 s 3.2.2.1.1.1

3.2.2.3.3.1





4 s 3.2.2.1.1.1

3.2.2.3.3.1





8 s 3.2.2.1.1.1

3.2.2.3.3.1





16 s 3.2.2.1.1.1

3.2.2.3.3.1



“Provide Location Response” response elements whenPREF_RESP_QUAL = ‘100’

32 s 3.2.2.1.1.1

3.2.2.3.3.1





64 s 3.2.2.1.1.1

3.2.2.3.3.1





128 s 3.2.2.1.1.1

3.2.2.3.3.1





256 s 3.2.2.1.1.1

3.2.2.3.3.1

T 9 The time limit for the mobile station to wait for a response

or a “Reject” to a sent request element

35 s 3.2.1.2

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Ann ex B – REQUEST/ RESPONSE ELEMENT TYPES

Table B-1 . MS Request s and BS Respons es

Code REQUEST Elem ents s ent by MS Co de RESPONSE Elem ents s ent by BS

0000 Reserved 0000 Reject

0001 Request Location Response 0001 Provide Location Response

0010 Request BS Capabilities 0010 Provide BS Capabilities

0011 Request Base Station Almanac 0011 Provide Base Station Almanac

0100 Request GPS Acquisition Assistance 0100 Provide GPS Acquisition Assistance

0101 Request GPS Sensitivity Assistance 0101 Provide GPS Sensitivity Assistance

0110 Request GPS Location Assistance 0110 Provide GPS Location Assistance –

Spherical Coordinate

0111 Reserved 0111 Provide GPS Location Assistance –

Cartesian Coordinate

1000 Request GPS Almanac 1000 Provide GPS Almanac

1001 Request GPS Ephemeris 1001 Provide GPS Ephemeris

1010 Request GPS Navigation Message Bits 1010 Provide GPS Navigation Message Bits

1011 Request GPS Almanac Correction 1011 Provide GPS Almanac Correction

See Table 3.2.4-2. Request Element Type and Table 4.2.4-3. Response Element Type.

Table B-2 . MS Respon ses and BS Requests

Code RESPONSE Ele men ts sen t by MS Co de REQUEST Elem en ts sen t by BS

0000 Reject 0000 Reserved

0001 Provide Location Response 0001 Request Location Response

0010 Provide MS Information 0010 Request MS Information

0011 Provide Autonomous Measurement

Weighting Factor

0011 Request Autonomous Measurement

Weighting Factor

0100 Provide Pseudorange Measurement 0100 Request Pseudorange Measurement

0101 Provide Pilot Phase Measurement 0101 Request Pilot Phase Measurement

0110 Provide Time Offset Measurement 0110 Request Time Offset Measurement

0111 Provide Cancellation Acknowledgement 0111 Request Cancellation

See Table 3.2.4-3. Response Element Type and Table 4.2.4-2. Request Element Type.

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C-1

Ann ex C – EXAMPLE POSITION DETERMINATION DATA MESS AGE

The following is an example of a mobile station originated Posit ion Determin at ion Data

Message . The example merely serves as an aid in understanding the format specified in the

body of the document. The example accommodates two mobile station requests, along with

a mobile station response (to a previous base station request to the mobile). The example

shows how the individual records (and fields) (i.e. REQ_TYPEs, REQ_PAR_RECORDs, etc.)

are built from the most significant bit (MSB) to the least significant bit (LSB), the length of

the individual records, and the ordering of the individual records within the final Position

Determina t ion Data Message . Finally, the entire bit string for the Posit ion Determin at ion

Data Message is constructed.

The Mobile requests the following information from the base station:

• GPS Acquisition Assistance

• GPS Almanac Correction

The mobile is also responding to a base station request for “Provide MS Information”

response element.

Individual fields of the Posit ion Determina t ion Data Message are listed in Table C-1. The

message begins with the PD_MSG_TYPE record and ends with a RESERVED record.

Table C-1 . Bit Field of the Pos it ion Dete rm ination Data Mess age

FIELD TYPE MSB → LSB COMMENTS

SESS_START 0 Not the first message of a session

SESS_END 1 The last message of a session

SESS_SOURCE 0 Base station originated the session

SESS_TAG 01100 Tag of the session

PD_MSG_TYPE 00000000 From Table 3.2.4-1

NUM_REQUESTS 0010 Making 2 requests

NUM_RESPONSES 0001 Making 1 response

REQ_TYPE 00000100 Request GPS Acquisition Assistance

REQ_PAR_LEN 00000001 indicates one octet in following

REQ_PAR_RECORD

REQ_PAR_RECORD 11110000 Requests DOPP_REQ, ADD_DOPP_REQ,

CODE_PH_PAR_REQ, AZ_EL_REQ + 4

RESERVED bits

REQ_TYPE 00001011 Request GPS Almanac Correction

REQ_PAR_LEN 00000010 Two octets in following REQ_PAR_RECORD

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REQ_PAR_RECORD

TOA 10010011 Requested reference Time Of Almanac =

602112 s

WEEK_NUM 10101010 Requested WEEK_NUM = 170

UNSOL_RESP 0000 Reserved bits + including a response to an

earlier BSS request with the above requests

RESP_TYPE 0100 Provide MS Information

RESP_PAR_LEN 00000110 six octets in following REQ_PAR_RECORD

RESP_PAR_RECORD

MS_LS_LEV 000000 by definition

MS_MODE 0000 by definition

PILOT_PH_CAP 000000 set to indicate Full Chip Measurement Capability (Table 3.2.4.2-2)

GPS_ACQ_CAP 000000100001 set to indicate GPS Acquisition Assistance

and GPS Almanac Correction Capability

(Table 3.2.4.2-3)

LOC_CALC_CAP 000010100101 set to indicate Location Assistance-

Spherical, AFLT, GPS Almanac Correction,

Hybrid Position Calculation Capability

(Table 3.2.4.2-4)

Therefore the entire Posit ion Determina t ion Data Message consists of 16 octets or 128 bits

as follows:

MSB and beginning of message

↓

00000000001000010000010000000001111100000000

10110000001001011001001110101010000001000000

0110000000000000000000100001000010100101

↑

LSB end of message

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