A Dual Mode Buffer for Reliable Multicast in Mobile IP Networks
Jinsuk Baek, Eun Jung Lee · 2006
In mobile IP networks, a local mobility agent is extended to assist reliable multicast for mobile nodes. Each agent keeps in its buffer all packets that are likely to be requested by any of its mobile nodes. They can provide reliable service by performing a retransmission for the requested packet from its mobile nodes. When a mobile node moves to another subnet, transmission errors tend to happen in bursts, because the two subnets have differential transmission delays from the sender. We propose a new scalable buffer management scheme taking into account this fact. Under our scheme, mobile nodes do not acknowledge for every correctly received packet to their local mobility agent; instead, they send infrequent feedbacks to their agent. The feedback schedule of each mobile node is adaptive to their transmission error patterns. The mobility agents can also perform adaptive packet discarding based on the feedbacks. Key words: Mobile IP, Multicast, Mobility agent, Buffer, Retransmission