Fine timing measurement positioning and improvements in wireless local area networks

Patent metadata

Field	Value
Publication number	US-9769626-B2
Application number	US-201514739115-A
Country	US
Kind code	B2
Filing date	Jun 15, 2015
Priority date	Jun 16, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A method of indoor positioning using Fine Timing Measurement (FTM) avoiding co-located access point (AP) is proposed. In a wireless local area network, an AP obtains neighboring AP location information and determines a list of co-located BSSIDs. In a first option, an STA first selects an AP and query for AP location and co-located BSSID information using ANQP (Access Network Query Protocol). In a second option, the STA first selects an AP and initiates FTM protocol with the selected AP and thereby obtaining AP location and co-located BSSID information. Upon obtaining the AP location and the co-located BSSID list, the STA can initiates FTM protocol with additional non-co-located BSSs for determining an accurate STA location.

First claim

What is claimed is:

1. A method comprising:
selecting a first access point (AP) by a station for performing fine timing measurement (FTM) positioning in an indoor wireless local area network;
obtaining a list of co-located Basic Service Set IDs (BSSIDs) of the first AP;
exchanging FTM frames by the station with the first AP; and
exchanging FTM frames by the station with a plurality of APs, wherein the plurality of APs are configured with BSSIDs excluded from the list of co-located BSSIDs of the first AP such that each of the plurality of APs and the first AP are not co-located with each other, wherein the list of co-located BSSIDs of the first AP refers to co-located APs that are geographically close to the first AP substantially.

2. The method of claim 1 , wherein a first BSS is co-located with a second BSS when the first BSS and the second BSS are configured on the same physical device, are configured with the same location as neighboring BSSs, or are geographically close to each other substantially.

3. The method of claim 1 , wherein the station selects the first AP based on a beacon frame broadcasted by the first AP, and wherein the beacon frame indicates capability of providing the list of co-located BSSIDs.

4. The method of claim 1 , wherein the station obtains the list of co-located BSSIDs of the first AP via Access Network Query Protocol (ANQP).

5. The method of claim 1 , wherein the station obtains the list of co-located BSSIDs via the FTM frame exchange with the first AP.

6. The method of claim 5 , wherein the station sends an FTM request frame comprising an explicit request for the list of co-located BSSIDs.

7. The method of claim 5 , wherein the station receives an FTM response frame comprising the list of co-located BSSIDs.

8. A wireless station, comprising:
a control and configuration module that selects a first access point (AP) for performing fine timing measurement (FTM) positioning in an indoor wireless local area network;
a receiver that receives a list of co-located Basic Service Set IDs (BSSIDs) of the first AP; and
an FTM module that exchanges FTM frames with the first AP, wherein the FTM module also exchanges FTM frames with a plurality of APs, and wherein the plurality of APs are configured with BSSIDs excluded from the list of co-located BSSIDs of the first AP such that each of the plurality of APs and the first AP are not co-located with each other, wherein the list of co-located BSSIDs of the first AP refers to co-located APs that are geographically close to the first AP substantially.

9. The station of claim 8 , wherein a first BSS is co-located with a second BSS when the first BSS and the second BSS are configured on the same physical device, are configured with the same location as a neighboring BSS, or are geographically close to each other substantially.

10. The station of claim 8 , wherein the station selects the first AP based on a beacon frame broadcasted by the first AP, and wherein the beacon frame indicates capability of providing the list of co-located BSSIDs.

11. The station of claim 8 , wherein the station obtains the list of co-located BSSIDs of the first AP via Access Network Query Protocol (ANQP).

12. The station of claim 8 , wherein the station obtains the list of co-located BSSIDs via the FTM frame exchange with the first AP.

13. The station of claim 12 , wherein the station sends an FTM request frame comprising an explicit request for the list of co-located BSSIDs.

14. The station of claim 12 , wherein the station receives an FTM response frame comprising the list of co-located BSSIDs.

15. A method comprising:
receiving, by an access point (AP), location information of neighboring APs in a wireless local area network;
determining a list of co-located Basic Service Set IDs (BSSIDs) of the AP based on the location information, wherein the list of co-located BSSIDs of the AP indicates that corresponding neighbor APs and the first AP are not co-located with each other;
transmitting the list of co-located BSSIDs of the AP to a non-AP station for performing fine timing measurement (FTM) positioning, wherein the list of co-located BSSIDs of the AP refers to the corresponding neighbor APs that are geographically close to the AP substantially; and
exchanging FTM frames with the station.

16. The method of claim 15 , wherein a first BSS is co-located with a second BSS when the first BSS and the second BSS are configured on the same physical device, are configured with the same location as neighboring BSSs, or are geographically close to each other substantially.

17. The method of claim 15 , wherein the AP broadcasts a beacon frame that indicates capability of providing the list of co-located BSSIDs.

18. The method of claim 15 , wherein the AP sends the list of co-located BSSIDs via Access Network Query Protocol (ANQP).

19. The method of claim 15 , wherein the AP sends the list of co-located BSSIDs via the FTM frame exchange with the station, wherein the AP receives an FTM request frame comprising an explicit request for the list of co-located BSSIDs.

20. The method of claim 15 , wherein the AP receives location information of the neighboring APs by exchanging Neighbor Report (NR) elements, by querying for location using access network query protocol (ANQP), or by requesting an FTM action frame with location from the neighboring APs.

Assignees

• Mediatek Singapore Pte Ltd

Inventors

• Bajko Gabor
• Wang Chao-Chun

Classifications

• G01S2201/02

  Indoor positioning, e.g. in covered car-parks, mining facilities, warehouses · CPC title

• G01S5/14

  Determining absolute distances from a plurality of spaced points of known location · CPC title

• G01S5/0236

  Assistance data, e.g. base station almanac · CPC title

• H04W64/00 Primary

  Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management · CPC title

• G01S13/878

  Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector (G01S13/874 takes precedence) · CPC title