Wireless communication system, terminal, message sending...

Details Wireless communication system, terminal, message sending... Wireless communication system, terminal, message sending...

2008-03-11

2008-03-11

Ramakrishnaiah, Melur (Department: 2614)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S422100, C455S456100, C455S404200

Reexamination Certificate

active

10792798

ABSTRACT:
Upon receiving a beacon, a terminal B sends a RTS control message to a terminal A before sending a registration request message to the terminal A. Upon receiving the RTS control message, the terminal A sends a CTS control message. The terminal B measures the time from when the RTS control message is sent to when the CTS control message is received so as to calculate the distance with the terminal A. If the distance with the terminal A is within a predetermined distance X1, the terminal B sends a registration request message to the terminal A. Similarly, the terminal A measures the distance with the terminal B, and sends a registration request acknowledgement message to the terminal B when the distance with the terminal B is within a predetermined distance X2.

REFERENCES:
patent: 6189098 (2001-02-01), Kaliski, Jr.
patent: 2002/0155845 (2002-10-01), Martorana
patent: 11-146452 (1999-05-01), None
U.S. Appl. No. 10/784,271, filed Feb. 24, 2004, Suzuki et al.
U.S. Appl. No. 10/792,798, filed Mar. 5, 2004, Saito et al.
U.S. Appl. No. 10/508,137, filed Sep. 17, 2004, Suzuki.
U.S. Appl. No. 11/742,989, filed May 1, 2007, Suzuki et al.

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