Patent ID: 8233437
Filing Date: 2012-07-31
Classification: H04L,H04W

Abstract:
1. A mobile IP communication system comprising: a plurality of mobile IP communication apparatuses in an access service network and comprising proxy mobile IP client functioning units, foreign agent functioning units, and DHCP proxy functioning units, the DHCP proxy functioning units having a common IP address, wherein the DHCP proxy functioning unit of a first mobile IP communication apparatus connected with a mobile station before movement includes a unit that reports information about the mobile station to a second mobile IP communication apparatus connected with the mobile station after movement, the DHCP proxy functioning unit of the second mobile IP communication apparatus includes a unit that acquires from the first mobile IP communication apparatus, information about the mobile station and a unit that receives an update message addressed to the common IP address and sent from the mobile station, executes an IP address update process based on the information about the mobile station, and reports an update result to the proxy mobile IP client functioning unit and the foreign agent functioning unit in the second mobile IP communication apparatus, wherein the DHCP proxy functioning unit of the second mobile IP communication apparatus includes a unit that receives an update message addressed to the common IP address sent from a mobile station without information notification and transfers the update message to the first mobile IP communication apparatus, and the DHCP proxy functioning unit of the first mobile IP communication apparatus includes a unit that receives the update message sent from the second mobile IP communication apparatus, executes an IP address update process, and reports the update result to the proxy mobile IP client functioning unit and the foreign agent functioning unit in the first mobile IP communication apparatus.