Logo TU Ilmenau




"Minimizing Mobile IP Handoff Latency", 2nd International Working Conference on Performance modelling and Evaluation of Heterogeneous Networks (HET-NETs'04), Ilkley, West Yorkshire, U.K., July 26 - 28, 2004.

Dr.-Ing. Ali Diab
Prof. Dr.-Ing. habil. Andreas Mitschele-Thiel
Date of publication
Handoff latencies affect the service quality of real-time applications of mobile users. With Mobile IP (MIP), the handoff
latency highly depends on the distance, i.e. delay, between Home Agent (HA) and Foreign Agent (FA). Hierarchical
MIP (HMIP) minimizes handoff latencies but depends on additional network elements introduced on the path between
HA and FA. The need for additional network elements contradicts with the principles of the Internet and impedes the
wide use of HMIP in a world-wide network.
In the paper, we propose an alternative to HMIP to reduce handoff latencies, which does not need additional network
elements beyond the FA and HA already known from MIP. The proposal is based on a new technique that uses local
authentication with the new FA independent of the re-authentication with the HA. With our approach some functions
previously implemented by the HA are additional supported by the FA. Thus, the MN can quickly resume the
transmission in up- and downlink after an handoff. We describe the modified MIP protocol and provide a simple
performance analysis comparing the handoff delay of MIP, HMIP and our approach. The comparison shows that the
performance of our proposal is comparable to the performance of HMIP.