Handover mechanisms in next generation heterogeneous wireless ...

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DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING a m verifies AT_MAC MH FAAA nPOA EAP Request/Identity FAAA oPOA AAA Brokers HAAA C mf EAP Response/Identity Diameter/ Cmf C fb EAP Response/Identity EAP Request/AKA-Reauth Cmf EAP Response/AKA-Reauth Cmf EAP Request/AKA-Notification C mf Diameter/ EAP Request/AKA-Reauth C fb C fb Diameter/EAP AKA-Notification w NTC C fb - 60 - Diameter/ EAP Response/Identity ah Cbh recognizes Diameter/ reauth ID EAP Request/AKA-Reauth Cbh Diameter/ EAP Response/AKA-Reauth Diameter/ EAP Response/AKA-Reauth Diameter/NTC Notification C ob C bh verifies AT_MAC Diameter/EAP and counter AKA-Notification w NTC Diameter/NTC Notification Cbh Figure 4.2 EAP-AKA re-authentication in a handover To abstract such a mutual relation between two networks, a new term called Network Trust Correlation (NTC) is introduced. The NTC refers to the explicit TR between a mobile’s home network and its visited network, which is required for roaming. From a mobile user’s perspective, one network appears to be a service domain of another network if their NTC is present. The NTC reflects network trust relationship and can be built through a roaming agreement between the two networks. Therefore, the NTC is subject to changes of roaming agreements to some extent. The re-authentication process of Figure 4.2 demonstrates that the absence of the NTC between the target network and the mobile’s home network would be a preliminary indicator for the handover failure in a roaming scenario. When a mobile user is in roaming, the required NTC may have an impact on handover performance. Therefore, it becomes necessary to have a quantitative NTC model for studying the NTC’s impact on roaming. In its simplest form, the NTC can be modelled as an on/off switch, which indicates the existence of an explicit TR. In this section, a more intelligent approach is presented. The proposed NTC model is based on the roaming broker network as shown in Figure 4.3. The third-party entities such as AAA brokers involved in intermediating ah
DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING AAA services are considered. It is assumed that AAA services intermediated by too many third parties may be less reliable. An applicable approach of modelling the NTC is to have the NTC correlated to the number of Trust Association Hops (TAH) on the AAA path between two networks. For example, the AAA path from the visited network to the MH’s home network covers two TAHs as illustrated in Figure 4.3. The TAH count would be the right parameter to show how a network is trust- associated with another. Figure 4.3 A network trust correlation model Therefore, the NTC between any pair of networks can be quantified as: NTC � h(i) (Equation 4.1) where h means the number of trust association hops and i represents the distance between two networks. 4.3 Trust Information Retrieval and Distribution Using the trust association hop based NTC model, the NTC between two networks can be promptly quantified when the authentication messages are exchanged. Because authentication is required in every handover attempt, the proposed scheme makes use of handover authentication process to obtain the NTC data between a pair of networks. Basically, the NTC data retrieval can be performed every time a mobile user attaches to a visited network in a handover. Because the authentication request passes through the visited network, e.g. the oPOA as shown in Figure 4.4, and would be processed at the HAAA, both the visited network and the HAAA have the knowledge of their NTC data. The NTC data retrieval is conducted during the handover. The distribution of a - 61 -
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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
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
Page 69 and 70: DYNAMIC NEIGHBOUR TRUST INFORMATION
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Page 93 and 94: Chapter 5 TRUST ASSISTED HANDOVER A
Page 95 and 96: 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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