Handover mechanisms in next generation heterogeneous wireless ...

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CONCLUSIONS AND FUTURE RESEARCH WORK reliable handover in a multi-operator environment. In this way, the THOA makes the support on dealing with the multiplicities of network operators an integral part of the mobile’s handover algorithm. The THOA provides flexibility for a network operator to define its own handover policies and exert control on handover of its subscribers. A system analysis framework was proposed for the performance evaluation of the THOA algorithm. The framework covers four parts: Movement Detection, Network Selection, Address Configuration and Network Registration, all of which contribute to handover delay. The proposed analysis framework was applied to a network model that was created for simulating a multi-operator heterogeneous wireless environment. The proposed multi-operator heterogeneous network model can mock up an interworking of UMTS and WLAN networks, and the variations of their network conditions using a Markov chain based transition probability matrix. Furthermore, two new parameters “Trust Density” and “Load Balance Factor” (LBF) were presented for the first time for the THOA related performance analysis. Their mathematical definitions were given. The simulation results showed that the proposed THOA can effectively reduce unnecessary handover attempts. This made a reduction of up to 35% in handover delay compared with other handover approaches. The results for the LBF proved that the THOA can provide a mechanism of having network load evenly distributed among available networks by adjusting its THOA Effective TAH Scope (ETS). More simulations on handover delay suggested that the THOA can work well with the finegrained AAA policies implemented by networks. In addition, through the simulations, the thesis elaborated how the THOA can be tuned to meet the performance requirements in various trust density scenarios. The simulations on QoS showed that the probable degradation of QoS from applying the THOA can be compensated by its own mechanism. Maintaining QoS in a handover would make the THOA very attractive to the deployment of real wireless networks. - 158 -
CONCLUSIONS AND FUTURE RESEARCH WORK 8.1.3 Proxy Based Authentication Localisation Scheme In Chapter 6, a Proxy Based Authentication Localisation (PBAL) scheme was proposed to provide fast authentication in a handover taking place between two networks without a trust relation. This is achieved by localising authentication in a handover at a proposed entity called Fast AAA Proxy (FAP). The FAP acts as a third-party entity for processing AAA requests coming from the networks associated with it. A trust association model based on pairwise keys shared between network entities was proposed. The proposed trust association model allows a large number of heterogeneous wireless networks to be interconnected in a loosely coupled manner through a few FAPs. The thesis presented a fast authentication ticket generation and encryption mechanism. With this mechanism, a mobile’s home AAA server proactively produces the security credentials that can be used by the mobile user later for its fast authentication in a handover. The PBAL provides a mutual authentication mechanism, through which both a mobile user and its visited network’s associated FAP can perform identity verification mutually in a handover. This proposed authentication mechanism is further protected by a session wide Local Authentication Key (LAK) that is derived from the trust association between the mobile user and its home AAA server. To minimise the risk of using a compromised session key, a session key renewal method was proposed in the PBAL. This session key renewal method allows both the mobile user and its visited network to initialise session key renewal. The thesis adopted an analytical approach to evaluate the security of the proposed PBAL scheme. The analysis on mutual authentication showed that a mobile user is able to verify whether a FAP is an authorised agent representing its home AAA server. The mobile user authenticates to the FAP by showing its knowledge of the LAK that can be computed using the correct preshared key applied between the mobile user and its home AAA server. The PBAL scheme demonstrated strong security against the replay attacks in the form of an adversary impersonating a mobile user. Moreover, the PBAL provides sufficient protection against the replay attacks, in which an adversary tries to fool a mobile user by impersonating an access network. This is done by using the LAK for the FAP verification, which is transitive and session related. Further security analysis was - 159 -
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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 175 and 176: ABBREVIATIONS 3G 3rd Generation Wir
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Page 181 and 182: REFERENCES [12] C. Politis, T. Oda,
Page 183 and 184: REFERENCES [37] Wi-Fi Alliance, "Wi
Page 185 and 186: REFERENCES presented at IEEE Intern
Page 187 and 188: REFERENCES [90] R. Verdone and A. Z
Page 189: REFERENCES [116] K. E. Malki and H.
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