Patent ID: 7417956

Claim:
A wireless communication system comprising: a mobile terminal; a base station apparatus operable to communicate via a wireless communication line with the mobile terminal; a data relay apparatus operable to communicate with the base station; and a server apparatus, wherein one of said mobile terminal, said base station apparatus, said data relay apparatus and said server apparatus includes: a transmitting unit operable to transmit transmission data and to receive acknowledgement data corresponding to said transmission data through a communication line; a monitoring unit operable to monitor said transmission data and said acknowledgement data; a determining unit operable to determine a retransmission timeout period based on a monitored result by said monitoring unit in a certain period; said transmitting unit is operable to retransmit said transmission data when said acknowledgement data is not received within said retransmission timeout period, wherein said monitoring unit is operable to monitor a round trip time and a data size (Dmin, Dmax, Dsize) of said transmission data, the round trip time being a time difference between a transmission time of the transmission data and a reception time of the acknowledgment data.