ON-VEHICLE RADIO COMMUNICATION UNIT, FACILITY-SIDE RADIO COMMUNICATION DEVICE, AND VEHICLE-HIGHWAY COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To reduce occurrence of trouble to retransmission control in a vehicle-highway communication system, wherein uplink (vehicle-to-highway) transmission and downlink (highway-to-vehicle) transmission do not always correspond to each other on one-to-one basis.;SOLUTION: A DSRC on-vehicle device discards transmission data for retransmission and quits the retransmission (270) even when it holds the transmission data for retransmission (260) in the case where a downlink communication slot is allocated to the device (210) and no uplink communication slot is allocated to the device (250).;COPYRIGHT: (C)2009,JPO&INPIT