Directional shadow registration for efficient mobility management

We propose DSR (directional shadow registration) that a new approach for seamless VoIP services. The core of DSR is to reduce the interdomain handoff delay and disruption time in VoIP service in mobile/wireless environments and is to prevent unnecessary traffic by shadow registration at neighboring cells wit a high probability of handoff DSR is established security association (SA) between the MN and AAA server (AAAF) in neighboring domain before the actual handoff occurs. To meet this end, DSR includes technique and algorithm for organizing DSRR (DSR Region) that reduces disruption and unnecessary traffic. We are introduced a cell division scheme and decided minimal DSRR. DSRR can sensed the optimal time for handoff through regional cell division and applied direction vector (DV) obtained through directional cell sectoring. By adopting the concept of DS, message exchange between nodes within the intradomain can be processed in interdomain environment. In addition, traffic that occurs at every handoff happened twice in DSR compared to n (the number of neighboring cells) times in previous researches.