Performance improvement in low latency handoff scheme in mobile IP communication system

Abstract

Performance of two low latency handoff schemes in mobile Internet protocol (Mobile IP), pre-registration handoff and post-registration handoff are evaluated in terms of packet loss by means of Network Simulation (NS). We describe several handoff implementations over wireless access based on the IEEE 802.11 standard on an NS simulation.We compare the system performance of pre-registration handoff and post-registration handoff with the original regional registration mobile IP with respect to packet loss. To reduce the packet loss in both schemes, the buffer is needed to implement at each base station and the overlapping area of each base station is considered.We, moreover, study the influence of the signaling cost over the anchor Foreign Agent (aFA) for post-registration handoff and over the Gateway Foreign Agent (GFA) for pre-registration handoff when both schemes have been implemented with the regional registration mobile IP. The group of FAs under the aFA or under the GFA has been selected in order to consume the minimal network resource.Post-registration handoff scheme, however, may lead to excessive signaling cost to an aFA where numerous FAs establish the bi-directional edge tunnel (BET) with it. Therefore, a method to determine the optimal number of FAs performing BET with the aFA in post-registration handoff is proposed. It is based on an analytical model by minimizing the total location update, packet delivery and processing BET costs. We investigate the total signaling cost at the aFA in the post-registration handoff by the proposed analytical model and NS simulation.