Dynamic QoS Aware Route Optimization for Networks with Mobility Agents

To minimize the large handover delays associated with Mobile IPv6 numerous micro-mobility protocols were proposed. In this paper, we consider the Mobility Agent (MA) based family of micro-mobility protocols such as Hierarchical Mobile IPv6 and Proxy Mobile IPv6 and focus on the issue of the bottlenecks that MAs can lead up to under high network load. We propose a Dynamic QoS aware Route Optimization with the aim of reducing the bottlenecks around MAs. We exploit the fact that not all classes of IP traffic require low handover latency support; for example, P2P traffic, web browsing, etc. do not require high QoS and are delay tolerant. Hence, such traffic classes can be forced to establish a direct connection with the CN and the routing policies at edge routers can ensure these traffic classes bypass the MA. The number of traffic classes that are to bypass the MA increases dynamically according to the congestion of the network. Results show that by implementing the dynamic route optimization the network utilization increases and the average packet delay in the network are reduced.