Cost-Reduced Inter-MAP Binding Update Scheme in Robust Hierarchical Mobile IPv6

In a wireless network, handover latency is very important in supporting user mobility with the required quality of service (QoS). The Hierarchical Mobile IPv6 (HMIPv6) approach is one such scheme which reduces the high handover latency that arises when mobile nodes perform frequent handover in Mobile IPv6 wireless networks. Although HMIPv6 reduces handoff latency, failures in the mobility anchor point (MAP) results in severe disruption or total disconnection that can seriously affect user satisfaction in ongoing sessions between the mobile node (MN) and its correspondent nodes (CNs). In [3], an Robust Hierarchical Mobile IPv6 (RH-MIPv6) scheme is presented which enhances the HMIPv6 method by providing a fault-tolerant mobile service using two different MAPs (Primary and Secondary). It shows that the RH-MIPv6 scheme can achieve approximately 60% faster recovery times compared with the standard HMIPv6 approach. However, if MNs perform frequent handover in RH-MIPv6, these changes incur a high communication overhead which is configured by two local binding update units (LBUs) as to two MAPs. A new cost-reduced binding update scheme is proposed to reduce this communication overhead. Our proposed scheme improves the total handover latency up to 19.6% compared with IRH-MIPv6 for Inter-MAP handover.