In a radio communication system wherein a plurality of radio stations
perform data exchange by radio communication, each of the radio stations
has a function of outputting data to another radio station in the radio
communication system, a function of receiving data from another radio
station, and a function of relaying data in response to a request from
another radio station. When the radio station outputs data to a specific
target radio station but there is no acknowledgment from the target radio
station, the radio station outputs relay requests to many unspecified
radio stations. The radio stations, which have received the relay
requests, relay and output the data simultaneously to the target radio
station. Further, when the target radio station, which has received the
data relayed by the many unspecified relay stations, acknowledges the
receipt of the data, it selects an optimum radio station for relaying the
data from the reception level status of radio packets which have been
simultaneously transmitted from the many unspecified radio stations, and
outputs acknowledgment data to the selected radio station.
