Patent ID: 6069929
Filing Date: 2000-05-30
Classification: H04W,Y02D

Abstract:
A wireless communication system, comprising:at least one wireless communication terminal; andat least one transmission apparatus for transmitting a wireless signal containing a preamble portion and a non-preamble portion, to said at least one wireless communication terminal;said transmission apparatus comprises turn-off signal transmission means for transmitting, as a part of the non-preamble portion, a turn-off signal representing a bit sequence containing no pattern coinciding with a predetermined frame synchronization pattern;said at least one wireless communication terminal comprises:receiving means for receiving a wireless signal as a received wireless signal, and regenerating a bit sequence represented by the non-preamble portion of the received wireless signal,frame synchronization pattern detection means for trying to detect said predetermined frame synchronization pattern in the bit sequence represented by the non-preamble portion of the received signal, andsleep mode control means for changing an operation mode of the wireless communication terminal from a working mode to a sleep mode to reduce power consumption of the wireless communication terminal when the frame synchronization pattern detection means fails to detect the frame synchronization pattern in the bit sequence represented by the non-preamble portion of the received signal, in the working mode operation.