QoS Pre-Configure Mechanism on DiffServ Mobile IPv6 Networks

Next-generation wireless/mobile networks will be IP-based cellular networks integrating Internet with the existing cellular networks and Mobile IPv6 seems to be the proper next-generation wireless protocol. Mobile IPv6 is proposed to remain a device reachable even though the device roams away from one network to another. But Mobile IPv6 networks can only provide best-effort services and most studies show that current protocols, in general, fall short from satisfying the performance requirements for real-time applications such as VoIP applications especially when the networks are busy. That is, real-time applications need other mechanisms to guarantee the Quality of Services. This paper contributes a method called QoS Pre-Configure Mechanism to provide QoS on Mobile IPv6 Networks. This mechanism processes Authentication, Authorization, Accounting (AAA) and QoS parameters auto-contribution during the session initiation process by extending the Session Initial Protocol. Furthermore, roaming users can keep QoS guaranteed communications after attaching to foreign networks in the mechanism. We implemented the Voice over Mobile IPv6 software named NIC-Phone which supported QoS Pre-Configure Mechanism, and ran it on a Mobile IPv6 test-bed with DiffServ support. The experiments showed that the VoIP application worked well and gained speech quality on mobile IPv6 networks even when the mobile device was roaming. Be keen on the delay, jitter and lost-rate of the reality application, the results of experiments showed that our mechanism could provide high performance, especially when the networks were busy.