Fast route recovery methods for cellular IP access network

Cellular IP is a protocol for supporting micromobility of mobile hosts in a wireless access network. Cellular IP uses host-based-routing scheme to manage locations of mobile hosts. However, the traffic toward mobile 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 route recovery method toward the mobile hosts. In this paper we propose basic frameworks for updating each mobile host's location information in case of link failures. We propose fast route recovery methods in three different aspects, "route recovery using paging", "network initiated route recovery", and "mobile initiated route recovery". We performed a simulation to compare three methods based on route recovery time, packet loss during route 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.