1. Location Capability Negotiation
Month Year
doc.: IEEE yy/xxxxr0
November 2006
Location Capability Negotiation
Authors:
Date:
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Donghee Shim, et al
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
November 2006
Abstract
This presentation provides a mechanism for the STA and the Network to negotiate location capability to position the STA.
No change on currently defined architectures and frames for location services support is required.
No specific location determination mechanism is defined or required.
At the end of the presentation, there will be a motion to determine next steps.
Donghee Shim, et al
John Doe, Some Company

3. Current Location Proposal
November 2006
Current Location Proposal
Presence Configuration Procedure
Periodic exchange of frames for the purpose of collecting the necessary data to determine location by setting Presence Parameter information in Beacon, Probe Response or Presence Configuration Request
A STA periodically transmits Presence Request frame
AP collects data to position the STA
Establishing a location service that periodically provides location estimation by setting Presence Parameter information in Beacon, Probe Response or Presence Configuration Request
(1) AP periodically transmits Presence Response frame to provide location data to the STA
Presence Request Procedure
Advertise STA its Presence
Request STA its own location to the AP
Request AP location
Provide data to AP for the purpose of locating the STA
Presence Response Procedure
The Presence Response frame, Beacon and Probe Response frames provide presence reporting parameters to the STA by AP
A Presence Response frame may be sent to provide location information to a STA or exchange frames for location calculating purposes
Donghee Shim, et al

4. Current Location Proposal – cont’
November 2006
Current Location Proposal – cont’
Based on the normative texts in v draft, following can be deduced
STA-assisted positioning is supported such that AP collects measurement data provided by the STA and calculates the location of STA
Network-assisted positioning can be also supported such that STA can calculate its location based on measurement of time of arrival, however, it is not explicitly specified (timing measurement in the Probe Response message implicitly implies this capability)
STA-based positioning seems to be not supported
Various positioning technologies have been considered and would be considered, however, there is no specific handshake to negotiate the location capabilities of the STA and the Network to position the STA
Determining the positioning method before exchanging positioning related frames would be better
Donghee Shim, et al

5. November 2006
Thoughts
There is no exact way of negotiation of positioning method between the STA and the AP
Currently, STA-assisted positioning and STA-based positioning are supported
However, there is no capability to indicate the capability of STA such as STA-assisted positioning supported, STA-based positioning supported, or both supported or preferred one (sometimes the STA can indicate STA-assisted positioning preferred or STA-based positioning preferred) or autonomous mode (e.g. autonomous GPS)
Addition of capability parameters in location service parameters in the Presence Configuration Request frame can be considered
Addition of location service parameters including capability parameters in the Presence Configuration Response can be considered to indicate positioning method desired by the AP
Donghee Shim, et al

6. Location Capability Negotiation
November 2006
Location Capability Negotiation
STA can indicate its location capability AP
STA
Presence Configuration Request (…, Location Capability Parameters Element, …)
STA capabilities is included in Location Capability Parameters Element
Donghee Shim, et al

7. Location Capability Negotiation (cont’)
November 2006
Location Capability Negotiation (cont’)
AP can indicate its location capability AP
STA
Presence Configuration Response (…, Location Capability Parameters Element, …)
AP capabilities is included in Location Capability Parameters Element
Donghee Shim, et al

8. Location Capability Parameters Element
November 2006
Location Capability Parameters Element
Identifier
Field Name 1
STA based only 2
STA assisted only 3
STA based preferred 4
STA assisted preferred 5
STA based and STA assisted 6
Autonomous GPS
Reserved
255
Vendor Specific
Donghee Shim, et al

9. Proposal : Location Capability
November 2006
Proposal : Location Capability
Negotiation of Location Capability of STA and AP
Provides available positioning capability of the STA and the AP to each other
With Location Capability Parameters Element in Presence Configuration Request and Presence Configuration Response
Upon receiving the STA’s location capabilities, the AP can indicate the determined positioning method to be used
Donghee Shim, et al

10. November 2006
Motion
Move to have authors draft normative text for potential inclusion into TGv draft
Moved:
Seconded:
Donghee Shim, et al