Patent ID: 7545779
Filing Date: 2009-06-09
Classification: H04W

Abstract:
1. A mobile communication system in which a base station and mobile stations perform communication by a slotted-ALOHA method, the system being characterized in that a predetermined offset time is set between downstream communication frames from the base station to each mobile station and upstream communication frames from the mobile station to the base station; the base station transmits a transmission permission signal for permitting transmission of one frame of data when a particular one of the upstream communication frames is available, determines whether or not continuous transmission of subsequent data over a plurality of frames should be permitted if the subsequent data exists subsequently to the one frame of data received through the particular frame from one of the mobile stations, and transmits a continuous transmission permission signal for permission of the continuous transmission when the continuous transmission is permitted; and if each mobile station has data to be transmitted, it transmits one frame of data in response to the transmission permission signal from the base station, and transmits the subsequent data through a plurality of consecutive frames in the upstream communication frames when receiving the continuous transmission permission signal with respect to the transmitted one frame of data.