Title:
トランシーバの近接度推定に基づく通信信号伝送の制御
Document Type and Number:
Japanese Patent JP2009521178
Kind Code:
A
Abstract:
Radio transceivers 5 in a communication system periodically broadcast signal pulses 6 to enable a radio transceiver 5 to determine their proximity. Each radio transceiver 5 has a clock 16 for maintaining a time synchronised by a synchronisation means 17 via the Global Positioning System (GPS). Each radio transceiver 5 transmits a signal pulse 6 at the same point in the synchronised time. A signal detector 19 detects the start of a signal pulse 6 received from the closest radio transceiver 5 and a proximity estimator 20 estimates the proximity of the closest radio transceiver 5 by determining the difference between the point in the synchronised time at which the signal pulses 6 are broadcast and the point in the synchronised time at which the start of a signal pulse 6 received from another radio transceiver 5 is detected. A controller 21 compares the estimated proximity to a threshold and, if the proximity estimate is less than a given threshold, it prevents a transmission means 7 of the radio transceiver 5 from transmitting a communication signal.
Inventors:
Thayers Anthony Dee
Application Number:
JP2008546799A
Publication Date:
May 28, 2009
Filing Date:
December 19, 2006
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H04W74/08; H04B7/15; H04W8/00; H04W56/00; H04W84/18; H04W88/02
Attorney, Agent or Firm:
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
Yoshiyuki Yagabe
Akihiko Miyazaki
Fueda Shusen
Yoshiyuki Yagabe