A Cross-Layer Partner-Assisted Handoff Scheme for Hierarchical Mobile IPv6 in IEEE 802.16e Systems

• Main Authors: Kun-Lin Wu, 吳昆霖
• Other Authors: Yuh-Shyan Chen
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/99741974113626945520

碩士 === 國立中正大學 === 資訊工程所 === 95 === Mobility management, which supports seamless handoff and locality, is a key issue in the next generation wireless communication networks. Users get mobility capability and move around different kinds of subnets. Various enhanced wireless technologies, are proposed to support many kinds of internet services for mobile users. A new wireless technology, called WiMAX, has been specified in the IEEE 802.16e standard document, which provides higher bandwidth and larger coverage area than the IEEE 802.11 networks. In wireless IP network, Mobile IPv6 (MIPv6) provides the binding update message to update the mobile user’s IP information for supporting layer 3 mobility. Hierarchical Mobile IPv6 (HMIPv6) is proposed by employing a hierarchical network structure to reduce handoff latency of binding update procedures. However, HMIPv6 suffers large handoff delay and packet lost in macro mobility for mobile users. This thesis presents a cross-layer partner-assisted handoff mechanism based on HMIPv6, termed PHMIPv6 protocol. The PHMIPv6 protocol is a cross-layer, layer-2 and layer-3, approach. The partner station (PS), which is a new component with relay ability and adopted by our protocol, is an static mobile station (MS). With the aid of the PSs, care-of address (CoA) can be pre-acquired and DAD operation can be pre-executed by the PS before the MS initials the layer 2 handoff. The simulation results show that PHMIPv6 protocol actually achieves the performance improvements in the handoff delay time, the packet loss rate, and the handoff delay jitter.