Fast Route Recovery Methods for Cellular IP Access Network

Abstract

Cellular IP is a protocol for supporting micromobility of hosts in a wireless access network. Cellular IP uses host-based-routing scheme to manage locations of hosts. However, the traffic toward hosts is stopped in case of link failures between cellular IP nodes. For this reliability problem, basic cellular IP uses beacon packets called gateway broadcast packet, which are sent between long periods of time. Cellular IP does not provide any specific recovery method toward the hosts. In this paper we propose basic frameworks for updating each host's location information in case of link failures. We propose fast recovery methods in three different aspects, route recovery using paging, network initiated recovery, and mobile initiated recovery. We performed a simulation to compare three methods based on recovery time, packet loss during recovery and control packet overhead metrics. Although the second method is the fastest, nodes require some intelligence. The first and last methods are simple, but they depend on the protocol's timer values.