Location system for wireless local area network (WLAN) using RSSI and time difference of arrival (TDOA) processing
First Claim
1. A wireless local area network, comprising:
- a plurality of access point stations that receive and transmit communications signals within the wireless local area network, wherein a first set of said access point stations comprise WiFi compliant access point stations that measure signal strength and determine the received signal strength indication (RSSI) and a second set of said access point stations are operable in accordance with a time of arrival (TOA) real time location standard (RTLS);
a dual mode mobile station within the wireless local area network and operative for multimode communications with both said WiFi and RTLS compliant access point stations; and
a location processor operatively connected with each of said access point stations and operative for processing the RSSI from said first set of access point stations and creating a RSSI locate map and processing communication signals from the second set of access point stations and determining which signals are first-to-arrive signals to locate the mobile station and update the RSSI locate map to locate any non-dual mode WiFi devices.
10 Assignments
0 Petitions
Accused Products
Abstract
A wireless local area network includes a plurality of access point stations that receive and transmit communications signals within the wireless local area network. A first set of access point stations are WiFi compliant and measure signal strength and determine the received signal strength indication (RSSI). A second set of access point stations are operable in accordance with the time of arrival (TOA) real time location standard (RTLS). A dual mode mobile station is operative for multimode communication with both the WiFi and RTLS compliant access point stations. A location processor is operatively connected with each of the access point stations and processes the RSSI and creates a RSSI locate map and processes communication signals from the second set of access point stations and determines which signals are first-to-arrive signals to locate the mobile station and update the RSSI locate map and locate any non-dual mode WiFi devices.
-
Citations
24 Claims
-
1. A wireless local area network, comprising:
-
a plurality of access point stations that receive and transmit communications signals within the wireless local area network, wherein a first set of said access point stations comprise WiFi compliant access point stations that measure signal strength and determine the received signal strength indication (RSSI) and a second set of said access point stations are operable in accordance with a time of arrival (TOA) real time location standard (RTLS); a dual mode mobile station within the wireless local area network and operative for multimode communications with both said WiFi and RTLS compliant access point stations; and a location processor operatively connected with each of said access point stations and operative for processing the RSSI from said first set of access point stations and creating a RSSI locate map and processing communication signals from the second set of access point stations and determining which signals are first-to-arrive signals to locate the mobile station and update the RSSI locate map to locate any non-dual mode WiFi devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A system for locating an object within a monitored environment, comprising:
-
a dual mode tag transceiver associated with the object, said dual mode tag transceiver operative for transmitting RF communications signals; a plurality of receivers within the monitored environment for receiving RF communications signals from the dual mode tag transceiver, wherein a first set of said receivers comprise WiFi compliant receivers that measure signal strength and determine the received signal strength indication (RSSI) and a second set of said receivers are operable in accordance with a time of arrival (TOA) real time location standard (RTLS); and a location processor operatively connected with each of said receivers and operative to process the RSSI from said first set of receivers and create a RSSI locate map and process communication signals from the second set of receivers and determine which signals are first-to-arrive signals to locate the dual mode tag transceiver and associated object and update the RSSI locate map to locate any non-dual mode WiFi devices. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. A method of locating a dual mode mobile station within a wireless local area network, comprising:
-
transmitting wireless communications signals from a dual mode mobile station to a plurality of access point stations that comprise WiFi compliant access point stations that measure signal strength and determine the received signal strength indication (RSSI) and a second set of access point stations operable in accordance with a time of arrival (TOA) real time location standard (RTLS); processing the RSSI from the first set of access point base stations; creating a RSSI locate map; processing communications signals from the second set of access point stations to determine which signals are first-to-arrive signals for locating the dual mode mobile station; and updating the RSSI locate map to locate any non-dual mode WiFi devices. - View Dependent Claims (21, 22, 23, 24)
-
Specification