Method and system for proxy mobile IP (internet protocol) inter-domain node communication

The invention discloses a method and a system for proxy mobile IP (internet protocol) inter-domain node communication. The system for proxy mobile IP (internet protocol) inter-domain node communication comprises a route optimization proxy mobile IP (PMIP) domain and/or a traditional proxy mobile IP (PMIP) domain. The route optimization proxy mobile IP (PMIP) domain and/or the traditional proxy mobile IP (PMIP) domain comprise mobile nodes, mobile access gateways and local mobile anchors. The route optimization proxy mobile IP (PMIP) domain further comprises one or more communicated gateways which are used for realizing data interaction among PMIP domains. Solutions are provided for implementation of communication among route optimization proxy mobile IP (PMIP) domains and among route optimization proxy mobile IP (PMIP) domains and traditional proxy mobile IP (PMIP) domains.