Mobile communication network system, foreign agent router, address server and packet delivery method employed therein
AssigneeNEC Corporation
InventorHideaki Tani
Life of this patent
Estimating the term…
Abstract
A mobile communication network system is capable of achieving both of route optimizing function and demand for privacy protection. An address server determines network addresses to be assigned for a plurality of variable IP subnetworks and use period of the network addresses, and distributes network addresses to routers having foreign agent function in the variable IP subnetworks. When use period of the assigned network address expires, new network address of own router is at first assigned. Addition of the subnetwork having new network address is notified to respective routers of the fixed IP subnetworks using IP route control means.
Claims18
A mobile communication network system consisted of a plurality of subnetworks and applicable of mobile internet protocol, comprising:
- means for randomly varying addresses of said subnetworks;
- first announcement means provided in said plurality of subnetworks for announcing currently assigned addresses of respective own subnetworks to terminals included in own subnetworks;
- and
- second announcement means provided in said plurality of subnetworks for announcing currently assigned addresses of respective own subnetworks to adjacent routers,
- in said subnetwork, an address before variation and an address after variation being redundantly held until delivery of packets using the address before variation is completed.
A foreign agent router arranged in each of subnetworks consisting of a mobile communication network system applicable of mobile internet protocol, comprising:
- first announcement means for announcing currently assigned address of own subnetwork to terminals included in own subnetwork;
- and
- second announcement means for announcing currently assigned address of own subnetwork to adjacent router,
- an address before variation and an address after variation being redundantly held until delivery of packets using the address before variation is completed.
An address server connected to any one of a plurality of fixed internet protocol subnetworks in a mobile communication network system consisted of a plurality of fixed internet protocol subnetworks and a plurality of variable internet protocol networks and applicable of mobile internet protocol, comprising:
- distributing means for randomly varying and distributing network addresses of said plurality of variable internet protocol subnetworks so that network addresses before variation and network addresses after variation being redundantly held until delivery of packets using the address before variation is completed.
A packet delivery method in a mobile communication network system consisted of a plurality of subnetworks and applicable of mobile internet protocol, comprising:
- step of randomly varying addresses of said subnetworks;
- step of announcing currently assigned addresses of respective own subnetworks to terminals included in own subnetworks;
- and
- step of announcing currently assigned addresses of respective own subnetworks to adjacent routers,
- in said subnetwork, an address before variation and an address after variation being redundantly held until delivery of packets using the address before variation is completed.
Dependencies are inferred from the claim text.