Mobility Protocols and Handover Optimization: Design, Evaluation and Application

Chapter 8Optimizations for Simultaneous Mobility

In this chapter, we analyze the problem due to nonreceipt of binding updates that results when two mobile nodes move simultaneously, and propose optimization techniques that increase the probability of successful handover in the simultaneous-mobility scenario. These optimization techniques could be applied to mobility protocols in several layers—network layer mobility protocols such as MIPv6 (Johnson et al., 2004) and MIP-LR (Jain et al., 1999), and application layer mobility protocols such as SIP-based mobility (Schulzrinne and Wedlund, 2000a).

8.1 Summary of Key Contributions and Indicative Results

Without a thorough analysis of the simultaneous mobility problem that arises from nonreceipt of binding updates when two hosts move when they are in communication with each other, it is difficult to predict the parameters that affect the simultaneous mobility problem and to propose solutions to mitigate the problems. Prior to the present study, there was no comprehensive study that analyzed the simultaneous mobility problem, nor was there any existing solution to mitigate the problems in an infrastructure-based mobility environment.

Here, we analyze the simultaneous mobility problem and develop an analytical framework to study the effect of the interhandoff rate of the mobiles and the binding update latency on the probability of occurrence of the simultaneous mobility problem. We have proposed timer-based retransmission, forwarding, ...