Method and system for controlling communication network and router used in the network

摘要

The present invention provides a communication network comprising a host network, a plurality of base stations, at least a mobile host capable of establishing links to the base stations, and a hierarchy-network of plural routers which are improved in transferring performances for ensuring continuous operations with a reduced load without packet loss.

主权项

1. A communication hierarchy network system providing multi-point connection, the system comprising:
plural sets of routers, each of the sets of routers including plural routers, wherein each of the plural routers in each of the sets of routers has a same routing information to transmit a packet, and is connected to each of the plural routers in another of the sets of routers at a higher hierarchical level and connected to each of the plural routers in further said sets of routers at a lower hierarchical level, each of the plural routers in each of the sets of routers at a hierarchical level comprising, a transmitter configured to transmit information including a flag for selecting one of the plural routers as a communication route router at each hierarchical level to each of the plural routers in the sets of routers at a lower hierarchical level, and to periodically transmit an effectiveness indicating message to each of the plural routers in one of the sets of routers at a higher hierarchical level, and a controller configured to select the respective own router as the communication route router when receiving information with the flag ON from each of the plural routers in the sets of routers at a higher hierarchical level, wherein when the effectiveness indicating message is not transmitted from the communication route router at a lower hierarchical level in a predetermined time, said transmitter transmits the information with the flag ON to another of the plural routers at the lower hierarchical level to reselect the communication router router, and wherein a mobile node position recording message is transmitted to each of the plural routers in one of the sets of routers from one of the plural routers in one of the sets of routers at a lower hierarchical level, and wherein only the one of the plural routers selected as the communication route router retransmits the mobile node position recording message to each of the plural routers in one of the sets of routers at a higher hierarchical level.