Patent ID: 7394824

Claim:
A packet communication system having a parent station and a plurality of child stations connected only to the parent station, the parent station comprising: a first timer configured to monitor a first period, which is a response detection period in the parent station; a transmission allocation device configured to allocate to a first child station a first transmission permission right to transmit a first packet to the parent station, the first transmission permission right set in a permission racket including a transmission permission identifier of the first child station and said permission packet is transmitted to the first child without first polling the first child station; and the transmission allocation device configured to sequentially allocate to a second child station, without first polling the second child station, a second transmission permission right to transmit a second packet to the parent station at the end of the first period, in the case that reception of the first packet from the first child station is not started during the first period, wherein the parent station distinguishes a child station from which a transmission is received based on a corresponding transmission permission right which was allocated during a time period in which the transmission was received.