| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize data transmission reception to a mobile terminal moving among pluralities of sub-networks with a simple configuration. SOLUTION: The packet routing device 1 is provided with INF cards 4a-4c and IP encapsulation/decapsulation sections 3a 3c corresponding to sub networks 5a-5c. Then the IP encapsulation/decapsulation sections 3a-3c are connected to an IP routing section 2 having the similar function to that of an existing IP router. Then the IP encapsulation/decapsulation sections 3a-3c encapsulate the IP packet received respectively from the I/F cards 4a-4c and transfer the result to any of the IP encapsulation/decapsulation sections 3a-3c via the IP routing section 2. The IP encapsulation/decapsulation sections 3a-3c receiving the encapsulated IP packet decapsulate the IP packet and transfer the result to corresponding to sub networks 5a 5c.</p> |
