1-Ora000006 Cdma2000 Signaling Procedure(Bss) Issue3.1

8/11/2019 1-Ora000006 Cdma2000 Signaling Procedure(Bss) Issue3.1

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Wireless Curriculum Development Section

ISSUE

ORA000006: CDMA2000 Signaling

(BSS)

3.1


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Course Contents

Chapter 1 System Interfaces

Chapter 2 MS Registration

Chapter 3 Voice Call Setup

Chapter 4 Handoff Procedure

Chapter 5 Data Connection Setup


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A Simple CDMA 1X BSS Network

PSTNMSC

PDSN

Abis A10/A11

A1/A2

A3/A7

BSC

PCF

A8/A9Um

CDMA2000 1XBSS

MS

MS

BTS

BTS

BTS

BTS

BTS

BTS

BSC


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Description of Interfaces

Um interface carries all signaling & services between MS

and BTS over radio links.

Abis interface carries signaling & services between BTS

and BSC.

A1 interface carries call control signaling between MSCand BSC.

A2 interface provides 64kbit/s PCM speech channels

between MSC and BSC.

A3 interface has two functions: Signaling and traffic. A3signaling is used to control and allocate the transmission

channels for user traffic.


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Description of Interfaces

A7 interface carries signaling between source BSC

and target BSC.

A8 interface carries user traffic between BSC and

PCF.

A9 interface carries signaling between BSC and PCF.

A10 interface carries user traffic between PCF and

PDSN.

A11 interface caries signaling between PCF and

PDSN.


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Course Contents







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MS Registration

When MS is power on, it needs to register in

mobile service area. For call permissions, it

needs to provides its authentication,

location and other call related parameters to

NSS.

It also needs to provide the information likeprotocol version and other characteristics to

the BSS.


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Registration Procedure

MSCBSMS

Location Updating Request

Location Updating Accept

Registration Message

Registration Accepted Order

ACH

PCH


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Course Contents







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Voice Call Origination

MS BTS BSCOrigination Msg

Abis-ACH Msg Transfer(ORM)

Abis-PCH Msg Transfer(Base Ack)Base Ack OrderAbis-BTS Setup

Abis-Connect

Abis-Connect Ack

Abis-BTS Setup Ack

Abis-is-2000 FCH Fwd(Null data)

Null Traffic Data

Abis-PCH Msg Transfer(ECAM)ECAM

Traffic Channel PreambleAbis-is-2000 FCH Rvs(Preamble)

Abis-is-2000 FCH Fwd(Base Ack)Base Ack Order

Idle TCH DataAbis-is-2000 FCH Rvs(Idle Data)

MS Ack OrderAbis-is-2000 FCH Rvs(Ms Ack)

Abis-is-2000 FCH Fwd(Ser Connect)Service Connect Msg

Service Connect CompleteAbis-is-2000 FCH Rvs(Ser Conn Comp)

CM Service Request

Assignment Complete

MSC

Assignment Request

ACH

PCH

TCH

PCH

TCH

TCHTCH

TCH

TCH

TCH


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Base Ack Order

MS BTS BSC

Abis-PCH Msg Transfer(Base Ack)

MSC

ACH

PCH

GPM

Abis-PCH Msg Transfer(GPM)

Paging ResponseAbis-ACH Msg Transfer(PRM)

Paging Request

PCH

CM Service Request

Assignment Request

TCH Establishment Procedure

Assignment Complete

Connect

Call Initialization by MSC


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Call Release (MS Initiated

MS

BTS

BSC

Release OrderAbis-IS-2000 FCH Rvs (Release Order)

Abis-BTS Release

Abis-Remove

Abis-Remove Ack

Abis-BTS Release Ack

Clear Request

MSC

Clear CommandAbis-IS-2000 FCH Fwd(Release Order)

Release Order

Clear Complete

TCH

TCH


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Call Release (Far-end Initiated)

Abis-BTS Release Request

MS BTS BSC

Release Order Abis-IS-2000 FCH Rvs(Release Order)

Abis-BTS Release

Abis-Remove

Abis-Remove Ack


MSC


Release Order

Clear Complete

Clear Request

TCH

TCH


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Call Release ProcedureInitiated By BSC

MS BTS BSC

Release OrderAbis-IS-2000 FCH Rvs(Release Order)

Abis-BTS Release

Abis-Remove

Abis-Remove Ack


MSC


Release Order

Clear Complete

Clear Request

TCH

TCH


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Call Release (Far-end Initiated)

MS BTS BSC

Release OrderAbis-IS-2000 FCH Rvs(Release Order)

Abis-BTS Release

Abis-Remove

Abis-Remove Ack


MSC


Release Order

Clear Complete

TCH

TCH


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Course Contents







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Handoff Types

Hard handoff

MS terminates its communication with the original BTS before settingup communication with the new BTS. In such handoff, break-before-

make technique is used.

Soft handoff

During handoff MS establish connections with both original and

target BTSs. In this way MS maintains communication with two or

three sectors of different cells simultaneously.

Softer handoff

It is also similar to the Soft handoff, the only difference is it takes

place between different sectors of the same BTS within the same

frequency. In addition, the softer handoff adopts coherent combination

for signals of different branches to achieve higher signal gain than the

selective combination used in ordinary soft handoff.

NOTE: Softer handoff is not possible between two different frequency

carriers


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Hard Handoff Procedure (Intra BSC)

MS MSCBSS_DBSS_S

Candidate Frequency Search Request

Candidate Frequency Search Response

Candidate Frequency Search Control

Candidate Frequency Search Report

Pilot Measurement Report

Base Ack Order

Null Forward Traffic Frame

Handoff Direction MessageReverse Traffic Channel Frames or Traffic Channel Preamble

TCH

TCH

TCH

TCH

TCH

TCH

TCH

Handoff Completion Message

BS ACK Order

TCH

TCH

TCH

TCHHandoff complete


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Hard HandoffInter BSC

Target BSSMS MSC

Handoff Required

Null Forward Traffic Channel Frames

Handoff CommandHandoff Direction Msg

MS Ack Order

Reverse Traffic Channel Frames or Traffic Channel Preamble

BS Ack Order

Clear Command

Clear Complete

Handoff complete

Handoff Request

Handoff Request Ack

Handoff Commenced

Handoff Completion Message

Source BSS

Candidate Frequency Search Request

Candidate Frequency Search Response

Candidate Frequency Search Control

Candidate Frequency Search Report

Pilot Measurement Report

Base Ack Order

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH


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Soft Handoff ( Intra BSC

MS BSCBTS_DPilot Measurement Report

Abis-IS-2000 FCH Rvs(Pilot Strength)

Abis-BTS Setup

Abis-Connect

Abis-Connect Ack

Abis-BTS Setup Ack

Abis-IS-2000 FCH Fwd(Forward Frame)

Forward Traffic Frame

Abis-IS-2000 FCH Fwd(EHDM)

MS Ack Order

Extended Handoff Direction Msg

Abis-IS-2000 FCH Rvs(MS Ack)

Handoff Completion MsgAbis-IS-2000 FCH Rvs(HCM)

Abis-IS-2000 FCH Fwd(Base Ack)Base Ack Order

Base Ack Order

BTS_S

Abis-IS-2000 FCH Fwd(Base Ack)


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Softer Handoff

Sector_S BSCPilot Strength Measurement


Abis-BTS Setup

Abis-Connect

Abis-Connect Ack

Abis-BTS Setup Ack

Abis-IS-2000 FCH Fwd(EHDM)Extended Handoff Direction Msg

MS Ack OrderAbis-IS-2000 FCH Rvs(Ms Ack)



Base Ack OrderAbis-IS-2000 FCH Fwd(Base Ack)

MS Sector_D

During softer handoff, no resource is allocated at the Abis interface.


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Soft Handoff TerminationIntra BSC

MS BTS_D BSCBTS_RPilot Measurement Report


Abis-IS-2000 FCH Fwd(EHDM)Handoff Direction Message

Base Ack OrderAbis-IS-2000 FCH Fwd(Base Ack)

MS Ack OrderAbis-IS-2000 FCH Rvs(MS Ack)



Abis-BTS ReleaseAbis-Remove

Abis-Remove Ack



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Softer Handoff Termination

Sec_D BSC

Abis-IS-2000 FCH Fwd(EHDM)Handoff Direction Msg

Pilot Measurement Report Abis-IS-2000 FCH Rvs(Pilot Strength)



MS Sec_R

MS Ack OrderAbis-IS-2000 FCH Rvs(Ms Ack)


Abis-BTS Release

Abis-Remove

Abis-Remove Ack



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Course Contents







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Mobile Packet data service states

An MS be in one of the 3 states during datatransmission:

Active: In this state, physical traffic channel exists

between MS and BTS, and both sides may transmitdata.

Dormant: In this state, no physical traffic channel

exists between MS and BTS. But the PPP

connection between MS and PDSN is maintained.

NULL: In this state, neither physical connection nor

PPP link is existed.


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State Transitions

Active State DormantState

Null State

Set up Um AbisA8

Release Um

Abis

A8


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Null to Active Initiated By MS

BSMSOrigination

BS ACK Order

MSC

CM Service Request

A9-Setup-A8

Assignment Request

PCF PDSN

Assignment Complete

Transmitting packet data

Establishing PPP connection Mobile IP Registration

A9-Connect-A8

ECAM

TCH Preamble

BS Ack Order

MS Ack Order

Service Connect Msg

Service Connect Cmp MsgA11 Registration

Request (Life time)

A11 Registration

Reply (Life time)


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Active to Dormant Initiated By BSC

MS PDSNBS MSC PCF

Active / PPP connected

Dormant / PPP connected

A9-Release-A8

A9-Release-A8 Complete

Clear Request

Clear Command

Clear Complete

TCH

Release

Procedure


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Dormant to ActiveInitiated By PDSN)

MS PDSNBS MSC PCF

Assignment Complete

Paging ResponsePage Response Msg

Assignment RequestBS Ack Order

Active Packet Data Session

Packet Data Traffic

BS Service Request

BS Service Response

Paging RequestPaging Msg

Dormant PPP connection is maintained

TCH Establishment

Procedure

A9-BS Service Response

A9-BS Service Request

A9-Setup-A8

A9-Connect-A8


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Active to NULL Initiated By MS

MS PDSNBS MSC PCF

Clear Complete

Release OrderClear Request

A9-Release-A8


Null State

Clear Command

Active / PPP connected

ReleaseOrder

A11-Registration-Request

A11-Registration-Reply


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Active to NULL Initiated By PSDN

A9-Disconnect-A8

BSMS MSC

Clear Request

Clear Command

PCF PDSN

A9-Release-A8

Clear Complete


Release Order

Release Order

A11-Registration-Update

A11-Registration-Ack

A11-Registration-Request

A11-Registration-Reply


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Active to NULL Initiated By MSC

BSMS MSC PCF PDSN

Clear Command

Release Order

Release Order

A9-Release-A8

A11 Registration Request

Clear Complete


A11 Registration Reply


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Documents

1-Ora000006 Cdma2000 Signaling Procedure(Bss) Issue3.1