SUBNET CONNECTION SWITCH COMMUNICATION SYSTEM

摘要

A system for preventing an increase of load of data processings due to a concentration of large amounts of data and network congestions that may occur when a great number of terminals switch connections of subnets at the same time. In this system, the communicational ranges of gates (FG13a, FG13b) constituting mutually different subnets are overlapped with each other such that either of the two gates can be connected within the overlapped range. On the side of a mobile body, a large number of terminals in the mobile body (mobile nodes VMN21) are grouped. When the mobile body exits in the overlapped range, the connections are switched from the subnet of one gate (FG) to that of the other gate with a time shift for each group (43). In particular, a VLAN (45) is formed for each group, and in each of the VLANs, a path switching (a connection shift) is performed, whereby shifting of subnets for connection can be easily performed for each group.