摘要:
Transmission of transmission packets from communication terminals (20) is executed with a probability based on the total number of communication terminals (20) present within a communication area (NA). It is thus possible to determine when to transmit with simple computation, and promptly transmit information. Since when to transmit can be determined with simple computation, when to transmit can promptly be determined according to continuously changing traffic conditions and the throughput of the communication system can be maintained at a high level when the communication terminals (20) are mounted on vehicles.