Passive Location Table Update Solutions Discussion
Explore proposed solutions for updating Passive Location LCI Table in IEEE 802.11 standards, addressing challenges in maintaining accurate location data for passive clients in wireless networks. Learn about the importance of timely LCI updates and the impact on passive ranging measurements.
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Doc.: IEEE 802.11-19-1893-00-00az Nov. 2019 ISTA LCI Table Updating for Passive Location Date: 2019-11-07 Name Feng Jiang Affiliations Address Intel Phone Email 3600 Juliette Ln, Santa Clara, CA 95054 feng1.jiang@intel.com Qinghua Li Dibakar Das Jonathan Segev Intel Intel Intel qinghua.li@intel.com dibakar.das@intel.com jonathan.segev@intel.com Feng Jiang, et al, Intel Corporation Submission
Doc.: IEEE 802.11-19-1893-00-00az Background Nov. 2019 In the CR to support AoD in passive location [1], the following spec text is added for Passive Location LCI table element in Primus RSTA Broadcast LMR: The ISTA LCI Report subfield is present if the ISTA has never transmitted it before or its content has changed and it is periodically present otherwise However, in the spec there is no definition for how the ISTA updates the LCI table with RSTA if its content has changed In this presentation possible solutions are discussed [1] IEEE 802.11-19/0677r3 Proposed resolution to LB#240 CID 2302 on AoD for passive ranging Feng Jiang, et al, Intel Corporation Submission
Doc.: IEEE 802.11-19-1893-00-00az Discussions Nov. 2019 In current spec, if an ISTA supports passive location, the ISTA s LCI table is only included in IFTMR frame during negotiation The LCI Report contains the Antenna Placement and Calibration subelement if the ISTA further supports AoD in passive location In passive location measurement sequence, RSTA periodically broadcast the ISTA s LCI table in the Primus Broadcast LMR frame When Passive Location LCI Table Countdown equals 0, the LCI table is included in the current availability window In the passive ranging session, the ISTA s LCI table may change ISTA may be mobile, and location information is dynamic ISTA may switch Tx antennas and antenna placement info is changed ISTA shall update the new LCI with RSTA to guarantee the passive client always use up-to-date LCI for passive location Feng Jiang, et al, Intel Corporation Submission
Doc.: IEEE 802.11-19-1893-00-00az Nov. 2019 Proposed Solution 1 If ISTA s LCI table is changed, ISTA shall send FTM request frame to RSTA with new LCI table before the next passive location measurement sequence. Or the ISTA shall not join the following passive location measurement sequences before it sends FTM request with LCI to RSTA After RSTA receives ISTA s FTM request with LCI report, the RSTA shall include the LCI report in the Primus Broadcast LMR in the immediate following passive ranging measurement sequence Passive Location LCI Table Countdown value can be reset Feng Jiang, et al, Intel Corporation Submission
Doc.: IEEE 802.11-19-1893-00-00az Nov. 2019 Proposed Solution 2 If ISTA s LCI table has changed, the ISTA shall send FTM request frame to RSTA to terminate the passive ranging session with RSTA With Triger field set to 0 The ISTA may send a new IFTMR frame to RSTA to re-negotiate a new passive ranging session The IFTMR frame includes the ISTA s new LCI report Feng Jiang, et al, Intel Corporation Submission
Doc.: IEEE 802.11-19-1893-00-00az Straw Poll Nov. 2019 To enable ISTA s LCI update with RSTA in passive location, which option do you support? Option 1: ISTA sends FTM request to update LCI with RSTA Option 2: ISTA sends FTM request to terminate current passive location session and re-negotiate with RSTA using new LCI Y: N: Abstain: Feng Jiang, et al, Intel Corporation Submission
