RADIO COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To simplify the communication protocol of a system where outgoing channel transmission speed is higher than the incoming channel one and also to improve communication efficiency. SOLUTION: The radio communication system is provided with a narrow band base station 3 providing a bi-directional radio channel, a wide band base station 4 providing an outgoing wide band radio channel with data transmission speed being higher than the bi-directional radio channel which is provided by the narrow band base station 3 and a radio terminal 20 executing radio communication with the base stations 3 and 4. The wide band base station 4 is provided with a timer 9 clocking a prescribed response waiting time after a packet is transmitted to the radio terminal 20 and a radio interface 8 re-transmitting the packet in any one of the cases when the timer 9 becomes time-out or when a REJECT message (NACK) from the radio terminal 20 is received. The radio terminal 20 is provided with the timer 33 clocking the prescribed response waiting time after the packet is transmitted to the narrow band base station 3 through the use of the bi-directional narrow band radio channel and a control part 34 re-transmitting the packet only when the timer 33 becomes time-out.