Patent ID: 7496083

Claim:
A mobility management node comprising: mobility management means for correlating a home address in a home network of a mobile node with a care-of (c/o) address in a network where the mobile node is located after movement; binding storing means for storing the home address and the c/o address of the mobile node correlated with each other by the mobility management means; transition detecting means for monitoring transition of the c/o address stored in the binding storing means, and for detecting a prefix of the c/o address before the transition and a prefix of the c/o address after the transition; transition history storing means for storing a transition frequency of the c/o address in correlation with the prefix of the c/o address before the transition and the prefix of the c/o address after the transition detected by the transition detecting means; paging area forming means for extracting predetermined combinations of the prefix of the c/o address before the transition with the prefix of the c/o address after the transition, stored by the transition history storing means, and for generating paging area information by a set of said prefixes included in the extracted combinations; and paging area notifying means for notifying the mobile node of the paging area information generated by the paging area forming means.