In the era of wireless communication, mobility management is one of the most significant issues to be resolved. Current IP-level mobility protocols such as Mobile IPv6 or Proxy Mobile IPv6 (PMIPv6) have difficulties meeting the stringent handover processing’s requirements. Besides, when there are many candidate networks, i.e., multiple destination networks, can be selected, a proper selection of Mobile Node’s destination network can improve the handover performance. In order to reduce the limitation within heterogeneous networks, the IEEE 802.21 Media Independent Handover Services (MIH) was developed. MIH enables the optimization of handover between heterogeneous networks. In this thesis, A Forward/Backward Fast Media Independent Handover Control Scheme for Proxy Mobile IPv6 (FFMIH-PMIPv6/BFMIH-PMIPv6) is proposed to integrate the robustness of MIH services and a proper selection of MN’s destination to improve the handover performance over PMIPv6 environment. Moreover, the current fast handover schemes mainly deal with the situation of one MN instead of multiple MNs. In the wireless network, it may exist a situation in which a group of MNs move from the same previous network to the next network. For example, a group of people are walking from the street to the same department store. In this scenario, multiple MNs start the handover preparation procedures and generate many duplicated control messages to handover from the same previous network to the same destination network. It makes the handover performance be worse to process so many handovers at the same time if there is no sophisticated processing scheme. In this thesis, a group-based fast media independent handover control scheme for PMIPv6 (GBFMIH-PMIP6) is proposed to resolve the aforementioned problem. In the proposed GBFMIH-PMIP6-PMIP6 control scheme, one MN initiates a handover preparation and other neighboring MNs, which want to do handover around the same time, can be collected as the same group of MN by the previous access point. Through the use of the shared invocation of the handover preparation procedure, (1) the handover preparation delay and handover processing delay can be reduced, (2) bandwidth consumption can be reduced and (3) the contention of wireless channel for multiple MNs can be improved due to the use of fewer control messages. As a result, the handover performance can be improved.

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