Handover mechanisms in next generation heterogeneous wireless ...

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SECURITY FOR HANDOVER ACROSS HETEROGENEOUS WIRELESS NETWORKS 3.3 Security for Efficient Handover Across Heterogeneous Networks The emergence of new access technologies has led to a variety of authentication solutions. As wireless networks are evolving towards an integrated architecture, the demand for the standardised security solutions in support of efficient handover across heterogeneous wireless technologies has increased. Current AAA solutions for wireless networks are proposed for individual wireless network, but lack a generic approach for the interworking of heterogeneous wireless networks [51]. Therefore, they need to be extended to build more general AAA services to facilitate seamless handover when heterogeneous systems are involved. 3.3.1 Generic AAA Architecture In a heterogeneous environment with multiple network domains belonging to different operators, each administrative domain may have an AAA server for managing its own subscribers. To enable interoperability between those heterogeneous domains, their network operators need to cooperate with each other as discussed in Sec. 3.1. A more advanced form of network interoperability - seamless handover, requires that a change of serving network operator that often results in a new trust relationship to be established (see Sec. 3.1) can be kept transparent to mobile users. Therefore, a generic AAA architecture that supports efficient AAA services across heterogeneous networks of different operators becomes the key to the success of an all-IP-based heterogeneous wireless infrastructure. Figure 3.5 shows a Mobile Host (MH) roaming case, in which the MH roams to disparate networks belonging to different operators. It is assumed that at least one AAA server resides in each network for providing AAA related services. When the MH hands over to a foreign network, its authentication process involves the Foreign AAA server (FAAA) on that network. The MH must be authenticated by the corresponding FAAA to verify its access privileges established through its Home AAA server (HAAA). The FAAA may communicate with the MH’s HAAA for authorisation policies. When the FAAA and the HAAA belong to different operators, a trust relationship between the two entities must be present for interoperability. This is referred to as an explicit mutual - 44 -
SECURITY FOR HANDOVER ACROSS HETEROGENEOUS WIRELESS NETWORKS trust relationship between two trusted parties [52]. Such a trust relationship can be established through shared security keys or dedicated communication channels. Maintaining trust relationships between different AAA servers for seamless roaming presents additional security requirements. Figure 3.5 A mobile host roaming case in a heterogeneous multi-operator environment To enable roaming capability for its subscribers, a network operator must establish roaming agreements with other network operators. The most straightforward approach is to have a pairwise agreement with each network operator. However, this approach 2 leads to O ( N ) overhead when N operators are involved in the interoperation. To reduce the number of roaming agreements required, an AAA proxy network is introduced. The AAA proxy network consists of a number of interconnected AAA proxies that hold security associations between each other and may exchange AAA messages for authentication of roaming mobile users. In a roaming case, an AAA message exchange between the FAAA of a visited network and the HAAA may pass through one or more AAA relay hops. With an AAA proxy network, instead of peering with every operator, each operator establishes a roaming agreement with one AAA proxy on the AAA proxy network, which acts as the third-party trust broker. This can - 45 -
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Handover Mechanisms in Next Generat
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ACKNOWLEDGMENT First of all, I woul
Page 5 and 6: TABLE OF CONTENTS 4.4.2 Power Save
Page 7 and 8: LIST OF FIGURES LIST OF FIGURES Fig
Page 9 and 10: LIST OF FIGURES Figure 7.2 A generi
Page 11 and 12: ABSTRACT New access technologies su
Page 13 and 14: Chapter 1 INTRODUCTION New access t
Page 15 and 16: 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
Page 25 and 26: HANDOVER MANAGEMENT horizontally. H
Page 27 and 28: HANDOVER MANAGEMENT The objective o
Page 29 and 30: HANDOVER MANAGEMENT air interface,
Page 31 and 32: HANDOVER MANAGEMENT proposed archit
Page 33 and 34: HANDOVER MANAGEMENT Access point (A
Page 35 and 36: HANDOVER MANAGEMENT users. Moreover
Page 37 and 38: HANDOVER MANAGEMENT For IEEE 802.11
Page 39 and 40: HANDOVER MANAGEMENT The two schemes
Page 41 and 42: HANDOVER MANAGEMENT When a MH is mo
Page 43 and 44: 3.1 Introduction Chapter 3 HANDOVER
Page 45 and 46: SECURITY FOR HANDOVER ACROSS HETERO
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Page 69 and 70: DYNAMIC NEIGHBOUR TRUST INFORMATION
Page 93 and 94: Chapter 5 TRUST ASSISTED HANDOVER A
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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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