DATA TRANSMISSION SYSTEM AND ITS BASE STATION AND SATELLITE

摘要

PROBLEM TO BE SOLVED: To provide a data transmission system whose polling efficiency is enhanced. SOLUTION: A base station of a mobile phone network has a control unit that generates a series of data packets to be sent to all mobile phones through a common downlink. Each data packet has a header including a 1st selection phone identification flag, polls the phones identified by the flag and allows the phones to return to the base station through a common channel. The header also includes a 2nd selection phone identification flag and an identification ID and a time slot, polls the phones identified by the flag and allows the mobile phones to return to the base station through a common channel thereby attaining to poll at least two phones. The control unit polls each phone twice for each polling cycle, one polling includes the identification ID of a 2nd standby uplink channel and a time slot with respect to the channel and the other polling does not include them.