Base station selection for positioning/localization based on an indication of capacity

Patent metadata

Field	Value
Publication number	US-2016337792-A1
Application number	US-201514709208-A
Country	US
Kind code	A1
Filing date	May 11, 2015
Priority date	May 11, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

Systems, apparatus and methods for selecting a base station or a set of base stations for RTT measurements, or other interactive radio localization technique, to determine a position fix of a device are presented. The method imposes a processing load on only inactive or less active base stations. Busy or busier base stations are not used in the interactive radio localization technique. By imposing a processing load on only less active base stations, transmitting devices may be under loaded and encounter a more uniform processing delay, and thus provide a more accurate measurement resulting in a more accurate position fix.

First claim

What is claimed is:

1 . A method for use in a device having an interactive radio localization capability, the method comprising:
transmitting a request message, to a transmitting device having a complementary interactive radio localization capability, based, at least in part, on an indication of operative capacity corresponding to the complementary interactive radio localization capability of the transmitting device; and receiving a response message, transmitted by the transmitting device in response to the request message.

2 . The method of claim 1 , further comprising receiving a message, from the transmitting device the message comprising the indication of operative capacity.

3 . The method of claim 1 , further comprising determining the indication of operative capacity.

4 . The method of claim 1 , wherein the request message comprises a round-trip time (RTT) ACK request and the response message comprises an RTT ACK response.

5 . The method of claim 1 , wherein the indication of operative capacity indicates at least one of:
an enable/disable interactive radio localization flag; an enable/disable burst flag; a count of request-response pairs per burst; a frequency of bursts; or an interactive radio localization schedule.

6 . The method of claim 1 , wherein the indication of operative capacity indicates at least one of:
a count of devices connected to the transmitting device; a count of devices in a coverage area of the transmitting device; or both.

7 . The method of claim 1 , further comprising:
measuring an overall delay based on a time between transmitting the request message and receiving the response message; determining a round-trip signal traveling time based on the overall delay; and computing a position fix of the device based, at least in part, on the round-trip signal traveling time.

8 . The method of claim 7 , further comprising:
sorting transmitting devices in a list based on the indication of operative capacity for each of the transmitting devices, wherein the transmitting devices comprises the transmitting device, and wherein the indication of operative capacity for each of the transmitting devices comprises the indication of operative capacity; wherein computing the position fix of the device comprises computing the position fix of the device based on the list and ignoring a second transmitting device, wherein the second transmitting device is busy.

9 . The method of claim 7 , wherein computing the position fix of the device comprises computing the position fix of the device based on an interactive radio localization technique with the transmitting device and a non-interactive radio localization technique with a second transmitting device.

10 . The method of claim 9 , wherein the interactive radio localization technique comprises a round-trip time (RTT) technique and the non-interactive radio localization technique comprises a received signal strength indicator (RSSI) technique.

11 . The method of claim 1 , wherein the device comprises a mobile device and the transmitting device comprises a base station.

12 . A device having an interactive radio localization capability, the device comprising:
a receiver; a transmitter; and a processor coupled to the receiver and the transmitter and configured to:
initiate transmission of a request message via the transmitter and to a transmitting device having a complementary interactive radio localization capability, based, at least in part, on an indication of operative capacity corresponding to the complementary interactive radio localization capability of the transmitting device; and
obtain a response message via the receiver and transmitted by the transmitting device in response to the request message.

13 . The device of claim 12 , wherein the processor is further configured to obtain a message via the receiver and from the transmitting device the message comprising the indication of operative capacity.

14 . The device of claim 12 , wherein the processor is further configured to determine the indication of operative capacity.

15 . The device of claim 12 , wherein the request message comprises a round-trip time (RTT) ACK request and the response message comprises an RTT ACK response.

16 . The device of claim 12 , wherein the indication of operative capacity indicates at least one of:
an enable/disable interactive radio localization flag; an enable/disable burst flag; a count of request-response pairs per burst; a frequency of bursts; or an interactive radio localization schedule.

17 . The device of claim 12 , wherein the processor is further configured to:
measure an overall delay based on a time between transmitting the request message and receiving the response message; determine a round-trip signal traveling time based on the overall delay; sort transmitting devices in a list based on the indication of operative capacity for each of the transmitting devices, wherein the transmitting devices comprises the transmitting device, and wherein the indication of operative capacity comprises the indication of operative capacity; and compute a position fix of the device based, at least in part, on the round-trip signal traveling time and ignoring a second transmitting device, wherein the second transmitting device is busy.

18 . The device of claim 12 , wherein the device comprises a mobile device and the transmitting device comprises a base station.

19 . A device having an interactive radio localization capability, the device comprising:
means for transmitting a request message, to a transmitting device having a complementary interactive radio localization capability, based, at least in part, on an indication of operative capacity corresponding to the complementary interactive radio localization capability of the transmitting device; and means for receiving a response message, transmitted by the transmitting device in response to the request message.

20 . The device of claim 19 , further comprising means for receiving a message, from the transmitting device the message comprising the indication of operative capacity.

21 . The device of claim 19 , further comprising means for determining the indication of operative capacity.

22 . The device of claim 19 , wherein the request message comprises a round-trip time (RTT) ACK request and the response message comprises an RTT ACK response.

23 . The device of claim 19 , wherein the indication of operative capacity indicates at least one of:
an enable/disable interactive radio localization flag; an enable/disable burst flag; a count of request-response pairs per burst; a frequency of bursts; or an interactive radio localization schedule.

24 . The device of claim 19 , further comprising:
means for measuring an overall delay based on a time between transmitting the request message and receiving the response message; means for determining a round-trip signal traveling time based on the overall delay; means for sorting transmitting devices in a list based on the indication of operative capacity for each of the transmitting devices, wherein the transmitting devices comprises the transmitting device, and wherein the indication of operative capacity for each of the transmitting devices comprises the indication of operative capacity; and means for computing a position fix of the device based, at least in part, on the round-trip signal traveling time a

Assignees

• Qualcomm Inc

Inventors

• Bhavsar Vrajesh
• Chen Yin
• Das Saumitra Mohan

Classifications

• H04W4/023 Primary

  using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds · CPC title

• H04L43/0864

  Round trip delays · CPC title

• G01S5/14

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

• H04W48/18

  Selecting a network or a communication service · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title