Wireless communication system, terminal, message sending method, and program for allowing terminal to execute the method
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United States of America Patent
Stats
-
Nov 27, 2012
Grant Date -
May 22, 2008
app pub date -
Jan 18, 2008
filing date -
Mar 6, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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