Beacon for locating and tracking wireless terminals

Details Beacon for locating and tracking wireless terminals Beacon for locating and tracking wireless terminals

2005-06-14

2005-06-14

Trost, William (Department: 2683)

Telecommunications

Radiotelephone system

Emergency or alarm communication

C455S404200, C455S456500, C455S456100, C342S357490, C342S357490, C342S357490, C340S988000, C340S991000, C340S993000

Reexamination Certificate

active

06907238

ABSTRACT:
A method and apparatus to facilitate the locating and tracking of a wireless terminal, which may be advantageously used for E-911 service. The terminal may be directed to transmit a beacon for certain events, such as in connection with a 911 call. The beacon has a specific format known by the wireless network, and may be periodically or continuously transmitted. The beacon may be transmitted using various schemes. In a first scheme, the terminal transmits the beacon only when directed to do so by a designated network entity (e.g., the PSAP). In a second scheme, the terminal transmits the beacon in conjunction with the 911 call, and is thereafter directed to terminate the beacon transmission by the designated network entity. The beacon allows the terminal to be accurately located even if it has moved or is physically located in an enclosed or “not-so-obvious” location.

REFERENCES:
patent: 5929777 (1999-07-01), Reynolds
patent: 6314281 (2001-11-01), Chao et al.
patent: 6362778 (2002-03-01), Neher
patent: 6363247 (2002-03-01), Gum
patent: 6477363 (2002-11-01), Ayoub et al.
patent: 2001/0034223 (2001-10-01), Rieser et al.
patent: 2001/0051514 (2001-12-01), Lindholm
patent: 2002/0072378 (2002-06-01), Gaal

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