Patent ID: 7356018

Claim:
A communication system, comprising: a master station communication device; and a plurality of slave station communication devices, each slave station communication device is assigned a unique associated identification (AID) to correspond to a unique bit order sequence number in a bit map information component of a transmission request, wherein the master station communication device transmits the transmission request simultaneously to all the slave station communication devices, the transmission request including: the bit map information component containing identification information identifying one or more of the slave station communication devices that are authorized to transmit information wherein authorization of each particular slave station communication device occurs when a â€œ1â€ bit is in the bit order sequence number of the bit map information component corresponding to the AID of that particular slave station communication device; and an authorized transmission time information component containing time information indicating duration of time when each authorized slave station communication device is to transmit the information, wherein a unique waiting period is determined for each authorized slave station communication device by counting the number of â€œ1â€ bits in the bit map information component located before the unique bit order sequence number corresponding the AID of each authorized slave station communication device, wherein each authorized slave station communication device transmits information after each corresponding unique waiting period to the master station communication device based on the transmission request transmitted therefrom, and all of the slave station communication devices enter a sleep mode after receiving the transmission request except during the time for which each authorized slave station communication devices are authorized to transmit the information.