On the Performance of Enhanced Hierarchical Mobile IPv6

This paper defines a multi-hierarchical architecture of Mobile Anchor Points (MAP) in a micro mobility network to enhance the performance of Hierarchical Mobile IPv protocol. By deploying this multi-hierarchical architecture of MAPs the latency of IP handoffs is reduced significantly so that the traffic performance during handoffs can be improved. For this purpose a new multi-Binding Update signalling packet is developed to accelerate the handoff process using a new registration mechanism, with which the MAP can forward the multi-Binding Update message to the next hierarchical MAP level. The acknowledgement message for the multi-Binding Update message will be sent by the last MAP or the Home Agent. Moreover, a modified function for processing the data packets destined to mobile nodes is introduced in MAPs so that the packet overhead can still keep small by avoiding multi-tunnelling that can be resulted from the multi-hierarchy of MAPs without this modification. The investigated proposal is implemented in NS2 and the improvements of the traffic performance are verified by the simulation results.