Handover mechanisms in next generation heterogeneous wireless ...

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DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING Figure 4.1 illustrates a multi-operator environment, in which multiple heterogeneous networks belonging to different network operators are interconnected through an AAA broker network. The AAA broker network is responsible for intermediating Authentication, Authorisation and Accounting (AAA) messages [53]. Current research has mostly focused on quick establishment of implicit TR so as to reduce handover delay using a variety of fast authentication mechanisms [69-71]. All these solutions are based on the assumption that an explicit TR between a mobile’s home network and its selected network already exists, and does not need verification during a handover. This assumption is reasonable only when a small number of network operators are available for network selection, and their trust relationships information can be easily made available to a mobile user. The mobile user can hold a network identifier list to assist it with network selection, as defined by 3GPP’s specification on system interworking [72]. However, such a solution lacks the scalability of supporting a large number of operators, and the flexibility of reacting to changes to network trust relationships. The current multi-operator support is largely provided as an add-on rather than an integral part of roaming solution to be effective. As a result, a mobile user’s unawareness of the second explicit TR may lead to unnecessary handover attempts and affect handover performance in a multi-operator environment [73]. A mobile user requires additional network trust information in a handover to support global roaming. In this chapter, a dynamic trust information retrieval scheme is proposed that overcomes the above mentioned problem. The proposed scheme called Dynamic Neighbour Trust Information Retrieval can provide a mobile user with ample network trust information about surrounding Points of Attachment (POA). 4.2 Network Trust Correlation The basic idea behind the proposed scheme is as follows. The network trust relation between two networks can be validated when a mobile subscriber of a network successfully handover to another network. In a handover, the AAA server on the mobile’s home network communicates with both the old POA (oPOA) and the new POA (nPOA) for AAA related services. The home AAA server can thus be used as an intermediate for exchanging information. Taking advantage of the home AAA server, - 58 -
DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING the information about the implicit TRs of the two neighbouring networks with a mobile user can be exchanged. This is applicable even when there is no direct trust association between the two neighbouring networks. By analysing handover history of a large number of mobile users, a network can dynamically obtain rich network trust information of its neighbours. In a peer-to-peer direct roaming, one network can be directly interconnected with another network via an interworking gateway [20]. Alternatively, a roaming broker network [53] can be utilised for assisting roaming, which supports collaboration between two networks being enabled through roaming agreements. In this chapter, it is assumed that the roaming broker network is to be used for global roaming. Every time a mobile user attaches to a POA, it has to establish an implicit TR with the visited POA. This can be done by getting the mobile user authenticated to its home network. A roaming broker network is used for intermediating AAA messages when the two networks are indirectly interconnected. Figure 4.1 illustrates how an implicit TR between a Mobile Host (MH) and a visited POA can be established using an efficient re-authentication method during a handover. The fast re-authentication has been specified in the Extensible Authentication Protocol Method for the 3rd Generation Authentication and Key Agreement (EAP-AKA) [74], and applied in 3GPP’s specification [75]. The MH sends an EAP/Identity to the new POA (nPOA) to request attachment. The nPOA forwards this identity to the MH’s home AAA server (HAAA). The HAAA will respond to a recognised identity by providing a set of security credentials as a challenge to the MH. The HAAA and MH exchange their security credentials and verify each other’s identity in a set of round trips. During this process, better known as mutual authentication, the visited network (e.g. nPOA) plays an important role as shown in Figure 4.1. In summary, a mutual relation between a visited network and a mobile’s home network must exist if the mobile wants roam to the visited network. - 59 -
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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
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
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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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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