Patent ID: 7738430
Filing Date: 2010-06-15
Classification: H04W

Abstract:
1. A base station for use in a mobile communication system in which communication is performed by a slotted-ALOHA method, wherein a predetermined offset time is set between downstream communication frames from the base station to a mobile station and upstream communication frames from the mobile station to the base station, the base station comprising: transmission permission signal transmitting means of transmitting, through a predetermined frame in the downstream communication frames, a transmission permission signal for permitting transmission of one frame of data when one of the upstream communication frames is available; receiving means of receiving one frame of data transmitted from the mobile station through one of the upstream communications frames corresponding to the predetermined frame; and continuous transmission permission signal transmitting means of determining whether or not continuous transmission of subsequent two or more frames of data should be permitted if the subsequent frames of data exists subsequently to the received one frame of data, and transmitting through the downstream communication frame a continuous transmission permission signal for permission of the continuous transmission when the continuous transmission is permitted, wherein the upstream communication frames from the mobile station to the base station are delayed from the downstream communication frames from the base station to the mobile station by a predetermined time period longer than one frame, and wherein the transmission permission signal is transmitted through the frame in the downstream communication frames corresponding to the first frame in the upstream communication frames if the first frame in the upstream communication frames is available.