Patent ID: 7710921

Claim:
A transmitted packet replenishing method, comprising in a mobile IP network: storing a packet transmitted by a mobile node in a storage device in the mobile node; managing replenishment information indicating how far in the past the packet is to be retransmitted to in the mobile node; transmitting a packet stored in the storage device according to the replenishment information when the mobile node detects occurrence of a handover; transmitting a packet retransmission stopping request to the mobile node to stop retransmitting a packet when it is recognized in a transmitting apparatus that a packet retransmitting process by the mobile node is not necessary; and stopping retransmission of a packet when receiving the packet retransmission stopping request; wherein a loss of a packet caused by the handover is replenished by retrieving a packet transmitted in the past from the storage device and retransmitting the packet transmitted in the past, and the replenishment information defines how far in the past the packet is to be retransmitted.