Handover mechanisms in next generation heterogeneous wireless ...

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Chapter 4 DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING 4.1 Problem Definition As discussed in Chapter 3, the maturity of new access technologies such as IEEE 802.11 (also known as Wi-Fi) and their widespread deployment would see a large number of small independent Wi-Fi operators co-existing with the cellular network operators. High speed Wi-Fi services can be provided with small radio coverage. Cellular technologies such as Universal Mobile Telecommunications System (UMTS) can provide wide radio coverage, but allow limited data rates. The growing demands for ubiquitous access are encouraging both independent Wi-Fi operators and big cellular operators to collaborate to enable seamless roaming across their heterogeneous wireless networks so as to maximise returns on investment. Two interconnected networks belonging to different operators must satisfy three prerequisites to enable seamless roaming between each other. First, an appropriate interworking architecture must be in place to integrate heterogeneous network resources. An interworking architecture provides a “hard” platform for network integration [66]. This is underpinned by interworking signalling, mobility protocols and so forth. Second, a mobile’s Quality of Service (QoS) during a handover needs to be optimised through some “soft” mechanisms, such as network selection, handover triggering and performance optimisation. QoS awareness ensures that handover operations can be kept transparent to upper layer applications. A number of papers [4, 13, 67, 68] have addressed the first two prerequisites discussed in this paragraph. - 56 -
DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING The third prerequisite on trust relationship requires that a mobile user’s home network must have a trust relation with the mobile’s visited network. This is usually available by enabling a roaming agreement between the two operators. A mobile user can roam to a visited network that has a roaming agreement with its home network due to security considerations. The co-existence and collaboration of a large number of operators inevitably result in complicated network trust relationships that are subject to changes in the roaming agreements over time. In order to access resources of global operators, a mobile user would have to deal with new trust-related challenges during global roaming. Research issues related to trust relationship for seamless roaming are being addressed. Shin et al. [52] suggested that three kinds of trust relationship are essential for secured access in a roaming scenario: 1) The explicit Trust Relationship (TR) between a mobile user and its home network that is established through service subscription; 2) The explicit TR between a visited network and the mobile’s home network, which can be set up by roaming agreements between the two network operators; 3) The implicit TR between the mobile user and its visited network, which is transitive and derived from the two explicit TRs. These relationships are shown in the Figure 4.1 below. Figure 4.1 Trust relationships in a multi-operator environment - 57 -
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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
Page 17 and 18: INTRODUCTION The above multipliciti
Page 19 and 20: INTRODUCTION network trust pattern
Page 21 and 22: INTRODUCTION 1.3 Related Publicatio
Page 23 and 24: INTRODUCTION TECHNICAL REPORTS XIII
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Page 27 and 28: HANDOVER MANAGEMENT The objective o
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Page 37 and 38: HANDOVER MANAGEMENT For IEEE 802.11
Page 39 and 40: HANDOVER MANAGEMENT The two schemes
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Page 43 and 44: 3.1 Introduction Chapter 3 HANDOVER
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Page 71 and 72: DYNAMIC NEIGHBOUR TRUST INFORMATION
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TRUST ASSISTED HANDOVER ALGORITHM F
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TRUST ASSISTED HANDOVER ALGORITHM F
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Chapter 6 PROXY BASED AUTHENTICATIO
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PROXY BASED AUTHENTICATION LOCALISA
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MULTI-INTERFACE MOBILE MODEL FOR ME
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CONCLUSIONS AND FUTURE RESEARCH WOR
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ABBREVIATIONS 3G 3rd Generation Wir
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ABBREVIATIONS LS Location Server MH
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ABBREVIATIONS THOA Trust Assisted H
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REFERENCES [12] C. Politis, T. Oda,
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REFERENCES [37] Wi-Fi Alliance, "Wi
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REFERENCES presented at IEEE Intern
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REFERENCES [90] R. Verdone and A. Z
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REFERENCES [116] K. E. Malki and H.
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