Patent ID: 8107453

Claim:
A mobile communication control method for allowing continuous and efficient communication when a mobile node having a plurality of interfaces respectively corresponding to a plurality of different communication networks and performing communication over respective areas of the plurality of different communication networks via the respectively corresponding plurality of interfaces performs communication with a correspondent node via a first access router configuring a subnet of a predetermined communication network among the plurality of different communication networks and, as a result of a handover by the mobile node, performs communication with the correspondent node via a second access router configuring another subnet of the predetermined communication network, the mobile communication control method comprising the steps of: transmitting a sustain request message, by the mobile node, to an access router via any of the plurality of interfaces, the access router holding communication environment information related to an environment of communication performed via the first access router and configured to expire after an elapse of a predetermined amount of time, the sustain request message stopping the communication environment information from expiring after the elapse of the predetermined amount of time; resetting, by the access router that has received the sustain request message, the predetermined amount of time until expiration based on the sustain request message; and establishing, by the second access router, a communication environment for communication by the mobile node performed via the second access router based on the communication environment information sustained by the sustain request message.