| 摘要 |
PROBLEM TO BE SOLVED: To provide a hand-over method that allows a portable telephone to conduct efficient transmission of data. SOLUTION: Upon the receipt of a beacon signal sent from a base station agent BA, a terminal agent MA mounted on a portable telephone 10 makes a request for agent information to the base station agent BA and stores the agent information sent from the base station agent BA, in response to the request. In the case of conducting hand-over method, when a channel is selected in a data link layer, the terminal agent MA uses the agent information stored in advance, to switch IP connection in a network layer, following the channel switching.
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