WO2015183199A1 - Method of joining co-located bss - Google Patents

Method of joining co-located bss Download PDF

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Publication number
WO2015183199A1
WO2015183199A1 PCT/SG2015/050128 SG2015050128W WO2015183199A1 WO 2015183199 A1 WO2015183199 A1 WO 2015183199A1 SG 2015050128 W SG2015050128 W SG 2015050128W WO 2015183199 A1 WO2015183199 A1 WO 2015183199A1
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WO
WIPO (PCT)
Prior art keywords
bss
ftm
bsss
information
wireless device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SG2015/050128
Other languages
French (fr)
Inventor
Gabor Bajko
Chao-chun WANG
Chih-Shi Yee
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MediaTek Singapore Pte Ltd
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MediaTek Singapore Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MediaTek Singapore Pte Ltd filed Critical MediaTek Singapore Pte Ltd
Priority to EP15799296.7A priority Critical patent/EP3138332B1/en
Priority to US15/313,953 priority patent/US10375623B2/en
Publication of WO2015183199A1 publication Critical patent/WO2015183199A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the disclosed embodiments relate generally to local wireless area network (WLAN) communications, and, more particularly, to direct finding and positioning in wireless local area networks (WLANs) .
  • WLAN wireless local area network
  • IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specification for implementing wireless local area network (WLAN) communication, in the unlicensed (2.4, 5, and 60 GHz) frequency bands.
  • MAC media access control
  • PHY physical layer
  • IEEE 802.11 plays an important role in the growing
  • the key applicable technology is that of ranging using time-of-flight (TOF) ranging measurements defined in IEEE 802. llv. Once the distance between devices is measured, the information can be used to determine device location.
  • TOF time-of-flight
  • FTM Fine Timing Measurement
  • TOF time-of- flight
  • RTD Round Trip Delay
  • timing measurements i.e., timestamps corresponding to the departure time and arrival time of the FTM frames
  • the station To calculate a station position, the station performs ranging measurements with multiple access points (APs) via FTM frame exchange and obtains AP' s positions. FTM positioning requires the initiating station to exchange FTM frames with multiple responding APs for TOF
  • APs access points
  • the station needs to exchange FTM frames with four or more APs in order to determine its absolute location.
  • BSSs Basic Service Sets
  • SSIDs station Identifiers
  • STAs would identify co-located BSSs and avoid doing FTM with co-located BSSs.
  • the STA should consider whether co-located BSSs of different capability can provide different level of location information, such as security, accuracy, etc, and whether there are more than one set of location information with respect to the same AP with different accuracy through different BSSs.
  • One of the conventional method is using multiple BSSID (mBSSID) to signal in beacons which BSSIDs are co- located.
  • mBSSID multiple BSSID
  • the MAC addresses for the co-located BSSs have to be contiguous, otherwise the feature cannot be used.
  • co-located BSSs may be administered by
  • a STA is associated with one of the BSSs which does not advertise FTM support, it may need to go off the channel to do FTM with the BSS that indicates the support for it.
  • this method does not allow the BSSs to provide FTM with different resolutions, add-on features, etc. Moreover, if the BSSs belong to different operators, it would be hard to agree which one to advertise FTM support.
  • a first wireless device obtains basic service set (BSS) information of a plurality of BSSs.
  • BSS basic service set
  • the wireless device then sends a fine time measurement (FTM) frame containing the BSS information to a second wireless device .
  • FTM fine time measurement
  • the BSS information is co-located BSS information.
  • the FTM frame is an unicast frame .
  • the second wireless device wirelessly joins to one of the plurality of BSS according to the BSS information.
  • Figure 1 illustrates the geometry of AP positions.
  • Figure 2 illustrates a frame in accordance with one novel aspect.
  • the co-located BSSs can advertise freely and independently about the FTM support that each BSS has. Therefore, a first wireless device such as the access points (APs) in each of the BSS, can receive the co-located BSS information. The AP can then send FTM frames that includes mBBSID or MAC addresses of the co-located BSSs, such as the frame shown in Fig. 2.
  • the FTM frame 200 includes the BSSID 201 of co- located BSS#1 until the BSSID 202 of co-located BSS#n.
  • the present embodiment does not overload the beacon, and the FTM frame can indicate a list of BSSIDs as it is unicast. Therefore, when a second wireless device, such as a station (STA) , receives the FTM frame that
  • the STA can select one of the BSSs to join and to perform FTM function.
  • the FTM frame can contain
  • This embodiment does not require coordination between the co- located BSSs. It only needs the MAC addresses information of co-located BSSs. And the BSSs can learn this
  • an indication can be added to the beacon to show that this BSS is co-located with other BSSs.
  • the beacon provides the capability for a STA to obtain the list of co-located BSSs' MAC addresses when the STA
  • ANQP Access Network Query Protocol
  • this embodiment does not require coordination between the co-located BSSs. It only needs the MAC addresses information of co-located BSSs. And this information can be learned or shared from each other.
  • an indication can be added to the beacon to show that this BSS is co-located with other BSSs.
  • the beacon provides the capability for a STA to obtain the list of co-located BSSs' MAC addresses when the STA
  • the STA can send a FTM Request Frame including one bit that is used to request the list of BBSIDs of the co-located BSSs. So an AP provides a FTM Frame to contain the list of co-located BSSIDs when requested in the FTM Request Frame.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method for a multiple BSSID environment in a wireless location area network (WLAN) is proposed. A first wireless device obtains basic service set (BSS) information of a plurality of BSSs. The first wireless device then sends a fine time measurement (FTM) frame containing the BSS information to a second wireless device. The second wireless device joins at least one of the BSS according to the BSS information.

Description

METHOD OF JOINING CO -LOCATED BSS
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Number 62/003,238 entitled "FTM and co-located BSSs," filed on May 27, 2014, the subject matter of which is incorporated herein by reference .
TECHNICAL FIELD
[0002] The disclosed embodiments relate generally to local wireless area network (WLAN) communications, and, more particularly, to direct finding and positioning in wireless local area networks (WLANs) .
BACKGROUND
[0003] IEEE 802.11 is a set of media access control (MAC) and physical layer (PHY) specification for implementing wireless local area network (WLAN) communication, in the unlicensed (2.4, 5, and 60 GHz) frequency bands. The standards and amendments provide the basis for wireless network products using the IEEE 802.11 frequency bands. IEEE 802.11 plays an important role in the growing
application of Indoor/Outdoor Location. The key applicable technology is that of ranging using time-of-flight (TOF) ranging measurements defined in IEEE 802. llv. Once the distance between devices is measured, the information can be used to determine device location.
[0004] In IEEE 802.11-REVmc, Fine Timing Measurement (FTM) protocol is proposed for Indoor Location. Based on FTM, an initiating station exchanges FTM frames during an FTM session with a responding station to measure the time-of- flight (TOF) or the Round Trip Delay (RTD/2) . The
initiating station then computes its range to the
responding station after receiving timing measurements (i.e., timestamps corresponding to the departure time and arrival time of the FTM frames) from the responding
station. To calculate a station position, the station performs ranging measurements with multiple access points (APs) via FTM frame exchange and obtains AP' s positions. FTM positioning requires the initiating station to exchange FTM frames with multiple responding APs for TOF
measurements in order to determine its absolute location. For 3D positioning, the station needs to exchange FTM frames with four or more APs in order to determine its absolute location.
[0005] However, for managed/controlled environments like airports, enterprise, or department stores, it is common to have many Basic Service Sets (BSSs) or Service Set
Identifiers (SSIDs) at close locations, i.e. co-located, as shown in Fig. 1. Therefore, it is no benefit for a station (STA) to initiate FTMs with co-located BSSs, because the STA will get the same location and round trip time (RTT). The APs might as well get overloaded with the FTMs.
Ideally, STAs would identify co-located BSSs and avoid doing FTM with co-located BSSs. The STA should consider whether co-located BSSs of different capability can provide different level of location information, such as security, accuracy, etc, and whether there are more than one set of location information with respect to the same AP with different accuracy through different BSSs.
[ 0006 ] One of the conventional method is using multiple BSSID (mBSSID) to signal in beacons which BSSIDs are co- located. The MAC addresses for the co-located BSSs have to be contiguous, otherwise the feature cannot be used.
However, the co-located BSSs may be administered by
different entities, thus it is not possible to perform coordination between the co-located BSSs .
[0007 ] Another known method is when multiple BSSs are co- located, only one of the BSSs can advertise FTM capability. But this method requires co-ordination between the BSSs.
If a STA is associated with one of the BSSs which does not advertise FTM support, it may need to go off the channel to do FTM with the BSS that indicates the support for it.
Besides, this method does not allow the BSSs to provide FTM with different resolutions, add-on features, etc. Moreover, if the BSSs belong to different operators, it would be hard to agree which one to advertise FTM support.
[ 0008 ] Hence, there's a need for a solution for simplified FTM advertising.
SUMMARY
[ 0009 ] It is therefore a object of the present invention to provide a method for a multiple BSSID environment. In this method, a first wireless device obtains basic service set (BSS) information of a plurality of BSSs. The first
wireless device then sends a fine time measurement (FTM) frame containing the BSS information to a second wireless device . [0010] In one embodiment, the BSS information is co-located BSS information.
[0011] In another embodiment, the FTM frame is an unicast frame .
[0012] In yet another embodiment, the second wireless device wirelessly joins to one of the plurality of BSS according to the BSS information.
[0013] Other embodiments and advantages are described in the detailed description below. This summary does not purport to define the invention. The invention is defined by the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 illustrates the geometry of AP positions.
[0015] Figure 2 illustrates a frame in accordance with one novel aspect.
DETAILED DESCRIPTION
[0016] Reference will now be made in detail to some
embodiments of the invention, examples of which are
illustrated in the accompanying drawings.
[0017] According to an embodiment of the present invention, the co-located BSSs can advertise freely and independently about the FTM support that each BSS has. Therefore, a first wireless device such as the access points (APs) in each of the BSS, can receive the co-located BSS information. The AP can then send FTM frames that includes mBBSID or MAC addresses of the co-located BSSs, such as the frame shown in Fig. 2. The FTM frame 200 includes the BSSID 201 of co- located BSS#1 until the BSSID 202 of co-located BSS#n.
[0018] Compared to sending mBSSID in beacon that used in prior arts, the present embodiment does not overload the beacon, and the FTM frame can indicate a list of BSSIDs as it is unicast. Therefore, when a second wireless device, such as a station (STA) , receives the FTM frame that
contains the mBBSID or MAC addresses of the co-located BSSs, the STA can select one of the BSSs to join and to perform FTM function.
[0019] In another example, the FTM frame can contain
multiple mBSSID elements instead of a list of BSSIDs. This embodiment does not require coordination between the co- located BSSs. It only needs the MAC addresses information of co-located BSSs. And the BSSs can learn this
information from each other.
[0020] According to another embodiment of the present invention, an indication can be added to the beacon to show that this BSS is co-located with other BSSs. The
indication may be only one bit in size. In other words, the beacon provides the capability for a STA to obtain the list of co-located BSSs' MAC addresses when the STA
receives such beacons from different BSSs. According to an embodiment of the present invention, a new Access Network Query Protocol (ANQP) element can be defined to ask the BSS about the MAC addresses of the co-located BSSs. Therefore, the STA can do FTM with only one BSSID from the list
received. Similarly, this embodiment does not require coordination between the co-located BSSs. It only needs the MAC addresses information of co-located BSSs. And this information can be learned or shared from each other.
[0021] According to yet another embodiment of the present invention, an indication can be added to the beacon to show that this BSS is co-located with other BSSs. The
indication may be only one bit in size. In other words, the beacon provides the capability for a STA to obtain the list of co-located BSSs' MAC addresses when the STA
receives such beacons from different BSSs. According to an embodiment of the present invention, the STA can send a FTM Request Frame including one bit that is used to request the list of BBSIDs of the co-located BSSs. So an AP provides a FTM Frame to contain the list of co-located BSSIDs when requested in the FTM Request Frame.
[0022 ] Although the present invention has been described in connection with certain specific embodiments for
instructional purposes, the present invention is not limited thereto. Accordingly, various modifications, adaptations, and combinations of various features of the described embodiments can be practiced without departing from the scope of the invention as set forth in the claims.

Claims

CLAIMS What is claimed is:
1. A method comprising:
obtaining by a first wireless device a plurality of basic service set (BSS) information;
sending by the first wireless device a fine time measurement (FTM) frame to a second wireless device;
wherein the FTM frame contains the BSS information.
2. The method of claim 1, wherein BSS information are co- located BSS information.
3. The method of claim 1, wherein the FTM frame is an unicast frame.
4. The method of claim 1, further comprising
the second wireless device joining at least one of the plurality of BSS according to the BSS information in the FTM frame.
5. The method of claim 1, wherein the BSS information comprise MAC addresses of a plurality of co-located BSS.
6. The method of claim 1, wherein the BSS information comprise multiple BSSID of a plurality of co-located BSS.
PCT/SG2015/050128 2014-05-27 2015-05-27 Method of joining co-located bss Ceased WO2015183199A1 (en)

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US15/313,953 US10375623B2 (en) 2014-05-27 2015-05-27 Method of joining co-located BSS

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US201462003238P 2014-05-27 2014-05-27
US62/003,238 2014-05-27

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CN114585071A (en) * 2015-12-09 2022-06-03 韦勒斯标准与技术协会公司 Wireless communication method and wireless communication terminal using multiple basic service identifier sets
US12150105B2 (en) 2016-03-04 2024-11-19 Wilus Institute Of Standards And Technology Inc. Wireless communication method and wireless communication terminal in basic service set overlapping with another basic service set

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CN114585071A (en) * 2015-12-09 2022-06-03 韦勒斯标准与技术协会公司 Wireless communication method and wireless communication terminal using multiple basic service identifier sets
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Also Published As

Publication number Publication date
EP3138332A1 (en) 2017-03-08
US20170195943A1 (en) 2017-07-06
EP3138332B1 (en) 2020-09-09
US10375623B2 (en) 2019-08-06
EP3138332A4 (en) 2017-12-13

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