A reactive learning mechanism for multihoming MN on PMIPv6

For a multihoming Mobile Node (MN), more resource is consumed because of multiple copies of every packet being forwarded to an MN according to the basic Proxy Mobile IPv6 (PMIPv6) specification. Therefore, network congestion and some security issues can't be avoided. To tackle the issues, this paper presents a reactive learning mechanism that a Local Mobility Anchor (LMA) initiates a learning procedure of IP addresses of interfaces when it firstly forwards a packet to a registered ¿pending¿ interface. The statuses of Binding Cache Entry (BCE) are set for ¿active¿ from ¿pending¿ after the Home Network Prefixes (HNPs) at BCEs have been updated with the learned IP addresses respectively. For achieving an IP address, minimum required messages and extension of messages are defined and detailed message sequence charts are elaborated in the mechanism. The mechanism is applicable to all current access technologies and possesses well expansibility. It does not change the BCE's matching principle of PMIPv6 and abides by the network prefix match. Moreover the mechanism can suite the alternation of IP address.