Jan 2007

Vijay Patel, Andrew Corporation

Slide 1

doc.: IEEE 802.11-07/0051r0

Submission

Location Reference for Emergency Services in WLAN Domain

Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.

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Date: 2007-01-11

Name Company Address Phone email Vijay Patel Andrew

Corporation 19700 Janelia Farm Blvd, Ashburn, VA 20147

(703) 726-5693

Vijay.patel@andrew.com

Authors:

Jan 2007

Vijay Patel, Andrew Corporation

Slide 2

doc.: IEEE 802.11-07/0051r0

Submission

AbstractThe Public Safety community, globally, is gearing up to take advantage of the IP proliferation to upgrade their network

systems, wire-line and wireless, in order to provide next generation of Emergency Services (ES). In this regard, NENA has developed and published VoIP-based (interim) i2 architecture for deployment of next generation of emergency services in North America.

In parallel, the FCC is working to create appropriate regulation in support of ES for newer wireless technologies such as WiMAX.

Location (positioning of an end-user) is fundamental to facilitating ES in fixed as well as mobile networks. And, as a byproduct, location also enables the network to provide many commercial Location Based Services (LBS).

The current 802.11k draft (D5.0) does specify the Location Configuration Information (LCI) Report and its format, in line with that standardized by IETF/Geopriv in IETF RFC 3825; however, this facilitates only conveyance of location information (lat-long-altitude). On the other hand, the i2 approach dictates the STA to acquire authentic location information from the LIS (Location Information Server) in the access network, and it also requires that the network, in addition, facilitate conveyance of location parameters that enable the LIS to calculate and determine the most relevant location of the STA/end-user.

Thus, the purpose of this presentation is to show the need to add location referencing aspects in support of the i2 approach by incorporation of mechanisms so that the LIS can retrieve necessary network parameters and end-user associated data for determination of location.

Jan 2007

Vijay Patel, Andrew Corporation

Slide 3

doc.: IEEE 802.11-07/0051r0

Submission

Background Information

• Subsequent to FCC E-911 mandate for Emergency Services (ES) deployment in existing cellular networks, similar rules are in works at the Commission for other newer wireless systems (such as WiMAX).

• Stakeholders in public safety applications foresee the advantages of and are preparing to deploy the Next Generation (NextGen) of IP-based ES networks.

• The National Emergency Number Association (NENA) has, in December 2005, published its (interim) i2 architecture standard for IP-based ES deployment in North America.

• Location or positioning of the end-user (SOS caller) is a core requirement for most emergency services.

Jan 2007

Vijay Patel, Andrew Corporation

Slide 4

doc.: IEEE 802.11-07/0051r0

Submission

Families of Location-Based Services (LBS)

• Emergency Services such as: SOS caller location, ES vehicle/personnel tracking and dispatch, real-time route-guidance and navigation in ES vehicles, etc.

• Intelligent Transportation Systems (ITS) services such as: commercial vehicle tracking, route-guidance & navigation, traffic management, en-route driver assistance

• Other LBS: such as yellow pages, locating people, maps and determination of destinations

• Network Management: for example, long-term and near-term people/vehicle mobility trends, real-time network configuration, congestion control, etc.

Jan 2007

Vijay Patel, Andrew Corporation

Slide 5

doc.: IEEE 802.11-07/0051r0

Submission

NENA defined (i2) migratory architecture

Note boundaries of responsibility!

ALI

ALI

Local

National

PAM

CAMAIP ISUP

CallServe

r

LIS

VPC – VoIP Position CentreLIS – Location Identification Server

SelectivSelective Routere Router

VPC E2+

ESGW

VSPISP

Global ESZboundary data

Call HandlingCall routing and location delivery

Location determination

Geodetic &Civil loc,n

locn

call

Civic addrMSAG validation

VDB

ERDB

Emergency network

911

Jan 2007

Vijay Patel, Andrew Corporation

Slide 6

doc.: IEEE 802.11-07/0051r0

Submission

PSAP1

VPCPSAP2PSAP1ESZ1

ESZ2ESRN = XESN = YES-Nums = n1, n2, n3…ELT = s1, s2, s3…

ESZ3

ESZ4

ESZ5

ESZ6

ERDB Call

Server

ESGW

SelectiveRouter

ALI

1

2

3

4

56

7

8

9

10

11

12

1a

LIS

CallbackNumLO|LK

LO request

LO

LO identified with applicable ESZ

ESRNESNES-NumsELT…

ESRNESQK

ESRNESQK

ESQK

ESQK

ESQK

ESQKLocationCallbackNum

ES-NumsELT etc…

LocationCallbackNum

ES-NumsELT etc…

ESGW chosen based on ESRN

SR chosen on ESRN and trunk selection rules specified by SR operator

PSAP route selected based on ESQK from SRDB

VPC selected based on ESQK

911LOsig

Call setup, routing and query routing

V0

V1

V2

V3

V4E2

Jan 2007

Vijay Patel, Andrew Corporation

Slide 7

doc.: IEEE 802.11-07/0051r0

Submission

LIS and IEEE802.11 WLAN• Today, WLAN is 802.11; and, IEEE802.11 is a matured standard• 802.11 WLANs are at the smallest location granularity under the wider (interworking)

wireless network expanse.• Some WLAN location applications at BSS/ESS level, include: locating needed

personnel (such as doctors) in a hospital environment, or experts (technicians or managers) in a factory or office setting.

• However, the current IEEE802.11k. D5.0 draft standard facilitates only the delivery of actual location data per the Location Configuration Information (LCI) Report mechanism.

• The NENA i2 architecture requires a Location Information Server (LIS), from which the STA, via IP, will acquire location:

– Using an application protocol that works above the IP layer (application layer)– LIS will also be used to authenticate the E-911 caller location– Depending on the network characteristics, a LIS will cover a few BSS/ESS as well as portions of

fixed and wide-area wireless access networks– LIS will also have capability to manage location measurement, compute location from raw data,

and provide updated location for mobile users.• Thus, location parameter conveyance is also required to be supported, in addition, so

as to enable the LIS function fully and as intended.• This same (LIS) approach is being adopted by IETF/Geopriv/ECRIT fora as well.• The LIS functionality is also being carried over in its totality to NENA’s i3 (end-to-end

IP) architecture that is under development.

Jan 2007

Vijay Patel, Andrew Corporation

Slide 8

doc.: IEEE 802.11-07/0051r0

Submission

802.11 WG Support for i2 Archr

• Location determination process and parameters will vary with access network technology (e.g., for WiMAX vs. DSL); however, global consistency for location acquisition method is required.

• Therefore, a generic mechanism in 802.11k specs is desired to facilitate delivery of certain information to LIS that would aid in determination of required location, such as:

– Some measurement data --- e.g., received signal strength and timing measurement data for the client STA that will enable LIS to select location method appropriate to the access network

– Certain network parameters that correlate with the MAC address and/or IP address of the client device (an STA, or an AP); IP address correlation at LIS eventually is always required

– Data necessary for the LIS to authenticate location associated with an STA (or AP) --- such as channel information

– Mobility condition of an STA, for obtaining location updates.• WG help is also requested in identification of PHY & MAC parameters

that may be useful for location determination and its refinement.

Jan 2007

Vijay Patel, Andrew Corporation

Slide 9

doc.: IEEE 802.11-07/0051r0

Submission

In Conclusion, We request• A generic mechanism– e.g. Location Parameter Conveyance Report, be

established in the 802.11k specs that will support LIS to obtain end-user (by MAC address) specific network parameters and other information.

• Support from 802.11 WG help to identify radio link parameters that would aid location determination and refinement.

• IEEE802.11 WG be the first to produce enabler location specs for ES and LBS.

• Naturally, then, the location related specification (messages and structure, information exchange, storage, and process-segments) would be ‘primitives’ that could be carried over to larger-sized networks such as WiMAX and cellular.

• Such an approach will facilitate global consistency for end-user devices in that:

– Location information acquisition is in the same manner, irrespective of the type of access network the dev ice is attached to, and

– Location acquisition is independent of the access network technology.

Jan 2007

Vijay Patel, Andrew Corporation

Slide 10

doc.: IEEE 802.11-07/0051r0

Submission

References

• Interim VoIP Architecture for Enhanced 9-1-1 Services (i2), NENA 08-001, Issue 1, December 06, 2005