System and Method of Passive and Active Scanning of WLAN-Enabled Access Points to Estimate Position of a WLAN Positioning Device
First Claim
1. A device for estimating the position of itself in response to gathering wireless signal information from WLAN access points (APs), said device comprising:
- a WLAN radio module for receiving WLAN signals transmitted by WLAN APs in range of said device;
scan logic to cause the WLAN radio module to scan for WLAN signals transmitted by WLAN APs in range of said device, wherein the scan logic stops the scanning after detecting a sufficient number of WLAN APs to locate the device;
extraction logic for extracting information from received WLAN signals to identify the WLAN APs; and
logic to cooperate with a WLAN-based positioning system to estimate the position of the device based at least in part on the extracted information identifying the WLAN APs in the range of said device.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems and methods of passive and active scanning of WLAN-enabled access points to estimate position of a WLAN positioning device. A device estimates the position of itself. The device includes a WLAN radio module for receiving WLAN signals, extraction logic for extracting information from said received WLAN signals to identify the WLAN APs, and logic to cooperate with a WLAN-based positioning system. The WLAN radio module includes a phase for active scanning of WLAN APs in range of said device and a phase of passive scanning of WLAN APs in range of said device, and the passive scanning phase scans only a pre-determined and selected subset of WLAN channels. Under certain embodiments, the WLAN radio module includes a passive scanning phase that simultaneously scans multiple WLAN channels.
9 Citations
10 Claims
-
1. A device for estimating the position of itself in response to gathering wireless signal information from WLAN access points (APs), said device comprising:
-
a WLAN radio module for receiving WLAN signals transmitted by WLAN APs in range of said device; scan logic to cause the WLAN radio module to scan for WLAN signals transmitted by WLAN APs in range of said device, wherein the scan logic stops the scanning after detecting a sufficient number of WLAN APs to locate the device; extraction logic for extracting information from received WLAN signals to identify the WLAN APs; and logic to cooperate with a WLAN-based positioning system to estimate the position of the device based at least in part on the extracted information identifying the WLAN APs in the range of said device. - View Dependent Claims (2, 3, 4)
-
-
5. A device for estimating the position of itself in response to gathering wireless signal information from WLAN access points (APs), said device comprising:
-
a WLAN radio module for receiving WLAN signals transmitted by WLAN APs in range of said device, wherein the WLAN APs are capable of transmitting on a set of WLAN channels; scan logic to cause the WLAN radio module to scan for WLAN signals transmitted by WLAN APs in range of said device, wherein the scan logic conducts the scanning based on how commonly a WLAN channel is used in at least one selected geographical region; extraction logic for extracting information from received WLAN signals to identify the WLAN APs; and logic to cooperate with a WLAN-based positioning system to estimate the position of the device based at least in part on the extracted information identifying the WLAN APs in the range of said device. - View Dependent Claims (6, 7, 8, 9, 10)
-
Specification