Distribution and utilization of antenna information for location determination operations

Patent metadata

Field	Value
Publication number	US-2016255604-A1
Application number	US-201514836530-A
Country	US
Kind code	A1
Filing date	Aug 26, 2015
Priority date	Feb 27, 2015
Publication date	Sep 1, 2016
Grant date	—

Abstract

Disclosed are implementations, including a method, performed at a processor-based mobile device, that includes receiving at the mobile device antenna information for a wireless node, including a transmitter gain for the wireless node in at least one message transmitted to the mobile device. The at least one message includes, a beacon frame message, a fine timing measurement (FTM) protocol-based message, and/or an assistance data message transmitted from a remote central repository. The method also includes deriving an estimate of a receiver gain for a receiver of the mobile device based, at least in part, on the transmitter gain for the wireless node, and adjusting one or more signal strength values determined for signals received from the wireless node based on the estimate of the receiver gain of the receiver of the mobile device derived based, at least in part, on the transmitter gain for the wireless node.

First claim

What is claimed is:

1 . A method comprising, at a processor-based mobile device:
receiving at the mobile device antenna information for a wireless node, including a transmitter gain for the wireless node, in at least one message transmitted to the mobile device, the at least one message including: a beacon frame message configured according to IEEE 802.11 standard transmitted from the wireless node, a fine timing measurement (FTM) protocol-based message, an assistance data message transmitted from a remote central repository of information, or any combination thereof; deriving an estimate of a receiver gain for a receiver of the mobile device based, at least in part, on the transmitter gain for the wireless node; and adjusting one or more signal strength values determined for signals received from the wireless node based on the estimate of the receiver gain of the receiver of the mobile device derived based, at least in part, on the transmitter gain for the wireless node.

2 . The method of claim 1 , further comprising:
determining received signal strength indication (RSSI) values for the signals received from the wireless node; wherein adjusting the one or more signal strength values comprises adjusting the RSSI values based on the estimate of the receiver gain derived based, at least in part, on the transmitter gain for the wireless node.

3 . The method of claim 1 , wherein the antenna information received further includes transmission power for the wireless node, and wherein deriving the estimate of the receiver gain for the receiver of the mobile device comprises:
deriving the estimate of the receiver gain for the receiver of the mobile device based, at least in part, on the transmitter gain and the transmission power for the wireless node, according to:
Mobile_ R x— Gain=RSSI measured −(AP_Tx_Power+AP_Tx_Gain)

where RSSI measured is an RSSI value measured at the mobile device for one of the signals transmitted by the wireless node, AP_T x— Power is the transmission power of the wireless node, and AP_T x— Gain is the transmitter gain for the wireless node.

4 . The method of claim 1 , further comprising:
determining distance to the wireless node based on the adjusted one or more signal strength values.

5 . The method of claim 1 , further comprising:
identifying a location estimate in a heatmap based on the adjusted one or more signal strength values.

6 . The method of claim 1 , further comprising:
generating a heatmap based, at least in part, on the adjusted one or more signal strength values.

7 . A mobile device comprising:
at least one transceiver to communicate with one or more remote devices; memory; and one or more processors coupled to the memory and the at least one transceiver; the mobile device configured to:
receive antenna information for a wireless node, including a transmitter gain for the wireless node, in at least one message transmitted to the mobile device, the at least one message including: a beacon frame message configured according to IEEE 802.11 standard transmitted from the wireless node, a fine timing measurement (FTM) protocol-based message, an assistance data message transmitted from a remote central repository of information, or any combination thereof;
derive an estimate of a receiver gain for a receiver of the mobile device based, at least in part, on the transmitter gain for the wireless node; and
adjust one or more signal strength values determined for signals received from the wireless node based on the estimate of the receiver gain of the receiver of the mobile device derived based, at least in part, on the transmitter gain for the wireless node.

8 . The mobile device of claim 7 , wherein the mobile device is further configured to:
determine received signal strength indication (RSSI) values for the signals received from the wireless node; wherein the mobile device configured to adjust the one or more signal strength values is configured to adjust the RSSI values based on the estimate of the receiver gain derived based, at least in part, on the transmitter gain for the wireless node.

9 . The mobile device of claim 7 , wherein the antenna information received further includes transmission power for the wireless node, and wherein the mobile device configured to derive the estimate of the receiver gain for the receiver of the mobile device is configured to:
derive the estimate of the receiver gain for the receiver of the mobile device based, at least in part, on the transmitter gain and the transmission power for the wireless node, according to:
Mobile_ R x— Gain=RSSI measured −(AP_Tx_Power+AP_Tx_Gain)

where RSSI measured is an RSSI value measured at the mobile device for one of the signals transmitted by the wireless node, AP_T x— Power is the transmission power of the wireless node, and AP_T x— Gain is the transmitter gain for the wireless node.

10 . The mobile device of claim 7 , wherein the mobile device is further configured to:
determine distance to the wireless node based on the adjusted one or more signal strength values.

11 . The mobile device of claim 7 , wherein the mobile device is further configured to:
identify a location estimate in a heatmap based on the adjusted one or more signal strength values.

12 . The mobile device of claim 7 , wherein the mobile device is further configured to:
generate a heatmap based, at least in part, on the adjusted one or more signal strength values.

13 . A mobile device comprising:
means for receiving antenna information for a wireless node, including a transmitter gain for the wireless node, in at least one message transmitted to the mobile device, the at least one message including: a beacon frame message configured according to IEEE 802.11 standard transmitted from the wireless node, a fine timing measurement (FTM) protocol-based message, an assistance data message transmitted from a remote central repository of information, or any combination thereof; means for deriving an estimate of a receiver gain for a receiver of the mobile device based, at least in part, on the transmitter gain for the wireless node; and means for adjusting one or more signal strength values determined for signals received from the wireless node based on the estimate of the receiver gain of the receiver of the mobile device derived based, at least in part, on the transmitter gain for the wireless node.

14 . The mobile device of claim 13 , further comprising:
means for determining received signal strength indication (RSSI) values for the signals received from the wireless node; wherein the means for adjusting the one or more signal strength values comprises means for adjusting the RSSI values based on the estimate of the receiver gain derived based, at least in part, on the transmitter gain for the wireless node.

15 . The mobile device of claim 13 , wherein the antenna information received further includes transmission power for the wireless node, and wherein the means for deriving the estimate of the receiver gain for the receiver of the mobile device comprises:
means for deriving the estimate of the receiver gain for the receiver of the mobile device based, at least in part, on the transmitter gain and the transmission power for the wireless node, according to:
Mobile_ R x— Gain=RSSI measured −(AP_Tx_Power+AP_Tx_Gain)

where RSSI measured is an RSSI value measured at the mobile device for one of the signals transmitted by the wireless node, AP_T x— Power is the transmission power of the wireless node, and AP_T x— Gain is the transmitter gain for the wireless node.

Assignees

• Qualcomm Inc

Inventors

• Venkatraman Sai Pradeep
• Marri Sridhar Subash
• Das Saumitra Mohan
• Aldana Carlos Horacio

Classifications

• H04W88/08

  Access point devices · CPC title

• H04W64/003 Primary

  locating network equipment · CPC title

• G01S5/02524

  Creating or updating the radio-map · CPC title

• H04W24/08

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

• G01S5/0236 Primary

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