Handover mechanisms in next generation heterogeneous wireless ...

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CONCLUSIONS AND FUTURE RESEARCH WORK conducted on the impact of network corruption at an access network applying the PBAL. It was proved that overhearing radio link and the disclosure of encrypted fast authentication ticket contents would not be a serious problem, because the related risk is limited to receiving the above mentioned replay attacks. In summary, the proposed PBAL provides an effective and secure mechanism of localising authentication at a third-party proxy in a handover without compromising security features in a multi-operator environment. 8.1.4 Multi-Interface Mobile Model for Media Independent Handover In Chapter 8, a multi-interface mobile terminal model for media independent handover was proposed. The proposed model was designed for facilitating seamless handover across heterogeneous wireless networks from the perspective of a mobile terminal. It is based on the idea of “Multi-Interface Alternatively Used”. In the proposed multiinterface architecture, a Handover Management Module (HMM) was presented which includes four subsystem modules: Policy Manager (PM), Handover Decision Trigger (HDT), Network Selector (NT) and POA Candidate Cache (PCC). The proposed architecture uses a cross-layer design approach, and is compatible with IEEE 802.21 Media Independent Handover (MIH) standard. Based on the proposed multi-interface architecture, a dual-interface 802.11 prototype had been implemented in ns-2. A Handover Manager was developed to simulate the HMM functions for the mobile terminal. The simulation in ns-2 proved that the proposed model can support common upper layer protocols such as TCP, UDP and Mobile IPv4. The cross-layer trigger mechanism applied greatly reduced handover delay, and made handover delay independent of heterogeneities of access network technologies. A smooth transition of non real time traffic being carried on TCP can be expected in a handover when such a cross-layer trigger mechanism is applied. - 160 -
CONCLUSIONS AND FUTURE RESEARCH WORK 8.2 Future Research Work The future wireless systems are expected to be based on heterogeneous wireless networks that are interconnected for providing ubiquitous high bandwidth services. Some of the future research directions that are related to handover across heterogeneous wireless networks belonging to multiple network operators are listed and briefly discussed below: � Decentralised-AAA security framework for the NG heterogeneous wireless networks: In this thesis work, it is assumed that the current security framework which was originally designed for homogeneous cellular networks will remain for the interworking of heterogeneous wireless networks in the future. The current security framework relies on a centralised AAA server for identity verification in a handover. However, heterogeneous wireless systems may rely on different security mechanisms and their network operators may execute different security policies. When a mobile user authenticates to these heterogeneous wireless networks in a handover, a centralised AAA server based security framework may become the bottleneck for provisioning IP-based multimedia services. Therefore, an alternative approach “a decentralised-AAA security framework” may be an effective add-on for the interworking of heterogeneous wireless systems. The decentralised-AAA security framework moves the primary AAA mechanism of a network to a group of networks to facilitate network collaboration. Future work can investigate this new security approach that is expected to bring many benefits to delay sensitive multimedia services in a handover. The decentralised-AAA security approach should be combined with the centralised-AAA security framework in the NG heterogeneous wireless networks. � QoS mechanisms for handover across heterogeneous wireless networks: The thesis assumed that “always best connected” [34] was the objective of performing a handover. However, maximising QoS in a handover can not always guarantee smooth transfer of data transmission in a handover across heterogeneous wireless networks. The smooth transfer of data transmission is characterised by the QoS provided by the source and target systems, which is expected to be nearly equal. - 161 -
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Handover Mechanisms in Next Generat
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ACKNOWLEDGMENT First of all, I woul
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TABLE OF CONTENTS 4.4.2 Power Save
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LIST OF FIGURES LIST OF FIGURES Fig
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LIST OF FIGURES Figure 7.2 A generi
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ABSTRACT New access technologies su
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Chapter 1 INTRODUCTION New access t
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INTRODUCTION becomes available. Han
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INTRODUCTION The above multipliciti
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INTRODUCTION network trust pattern
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INTRODUCTION 1.3 Related Publicatio
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INTRODUCTION TECHNICAL REPORTS XIII
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HANDOVER MANAGEMENT horizontally. H
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HANDOVER MANAGEMENT The objective o
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HANDOVER MANAGEMENT air interface,
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HANDOVER MANAGEMENT proposed archit
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HANDOVER MANAGEMENT Access point (A
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HANDOVER MANAGEMENT users. Moreover
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HANDOVER MANAGEMENT For IEEE 802.11
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HANDOVER MANAGEMENT The two schemes
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HANDOVER MANAGEMENT When a MH is mo
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3.1 Introduction Chapter 3 HANDOVER
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SECURITY FOR HANDOVER ACROSS HETERO
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DYNAMIC NEIGHBOUR TRUST INFORMATION
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Chapter 5 TRUST ASSISTED HANDOVER A
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TRUST ASSISTED HANDOVER ALGORITHM F
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Page 181 and 182: REFERENCES [12] C. Politis, T. Oda,
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