An Approach of End-to-End DiffServ/MPLS QoS Context Transfer in HMIPv6 Net

This paper proposes a solution which combines DiffServ with M-MPLS to provide a scalable and efficient QoS guarantees in the future 4G mobile communication networks. The end-to-end differentiated services are obtained by concatenation of per-domain services and SLS between adjacent domains along the path that the traffic crosses in going from source to destination. The COPS-SLS protocol is used as a signaling mechanism to achieve end-to-end inter-domain SLS dynamic negotiation for DiffServ in mobile environments. Using the context transfer to reestablish DiffServ/MPLS context can avoid reinitiating COPS-SLS signaling from scratch, and the end-to-end DiffServ/MPLS context only transfers to the newly added LMQAs along new path after the MN performs handover. The LSP modification capabilities of MPLS-TE signaling are used to perform fast restoration also. Hence the scheme can minimize the handover service disruption, and enable real-time session to promptly get the same forwarding process during the MN performs handover. The simulation results show that the scheme has better performance, such as smaller delay and delay jitter and packet loss ratio, and better throughput, than other schemes