Route optimization for Proxy Mobile IPv6 in IMS network

Localized mobility protocols are designed to address many of the drawbacks such as additional signaling and over-the-air tunnel overhead associated with global mobility protocols like Mobile IPv4 and Mobile IPv6. Proxy Mobile IPv6 is one such network controlled localized protocol defined in the IETF Although Proxy Mobile IPv6 can resolve longer binding update and tunnel overhead related issues when a mobile node's movement is confined to a specific domain, some of the handoff-related functions and data paths between two communicating nodes still need to be optimized. The data path reduction between the communicating nodes helps to reduce one way packet delay when both nodes are under the same localized domain and the local mobility anchor point is away. The process of reducing the data path is often referred to as route optimization. Route optimization helps to reduce the delay due to media delivery that is critical for real-time application. We propose several route optimization techniques that can be applied to Proxy Mobile IPv6 to improve the efficiency of media delivery for both intra- and inter-domain movements. We select one of these proposed route optimization mechanisms and then describe the implementation details and analyze the experimental results.