COMMUNICATION SYSTEM, RADIO COMMUNICATION APPARATUS, SERVER, AND DATA COMMUNICATION METHOD FOR RADIO COMMUNICATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To increase user's physically feeling speed without lowering the transmission efficiency as much as possible even if a radio wave signal propagating status fluctuates in the middle of downloading or uploading huge data.

SOLUTION: A control circuit 1a judges whether a radio wave signal receiving status tends to recover or to get adverse, sets a data size for one packet by setting a TCP/IP parameter relating to a maximum segment length and a window size on the basis of the judged result and requests communications in the relevant data size to a proxy server 5. When the request is accepted in the proxy server 5, communications are performed in the set packet data size between the proxy server 5 and a car navigation device 1.

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