Handover mechanisms in next generation heterogeneous wireless ...

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TRUST ASSISTED HANDOVER ALGORITHM FOR RELIABLE HANDOVER Address Configuration (AC): Address configuration delay ( t AC ) is incurred when a mobile user obtains a topologically correct address for local access from visited networks. t AC depends on the specific mobile IP implementation and the type of Care- of-Address (CoA) [21] to be used. D t NS tMD t AC tNR � � � - 96 - � � � ( h n �1) �tTAH � � tTAH Figure 5.5 An Analysis of delay in WLAN�UMTS handover Network Registration (NR): Network registration delay ( t NR ) is the period of time taken on establishing a mobility mapping between a mobile user’s CoA and its home address plus the delay on the AAA processing delay. Mobile user to nPOA Agent Router (AR) Round Trip Time (RTT) ( � ), nPOA AR to foreign AAA server FAAA RTT (� ), FAAA to FAAA RTT ( t TAH ), and FAAA to home AAA server HAAA RTT ( � ), and AAA processing at HAAA ( t AAA ) may combine to contribute to t NR . It is reasonable to assume that the signalling delay between AR and local AAA server can be neglected ( � � 0 ) due to much less signalling cost for internal communications compared with external ones. The MH-AR RTT largely depends on accessing technologies, and thus it may result in different values for WLAN ( � WLAN ) and UMTS ( � UMTS ). Based on the above analysis, the network registration delay function can be represented as follows: �
TRUST ASSISTED HANDOVER ALGORITHM FOR RELIABLE HANDOVER t � � � � � ( h �1) �t � t (Equation 5.8) NR n TAH AAA In the roaming AAA architecture, HAAA and FAAA are actually similar entities with common AAA functions and implementations, but play different roles for a particular mobile user. They exchange their roles for different roaming users. For this reason, the same AAA signalling delays between a FAAA and an AAA proxy, and between an AAA proxy and a HAAA can be expected in the AAA broker network [8]. Equation 5.8 can thus be simplified: t � � � h �t � t (Equation 5.9) NR n TAH AAA Based on the above analysis and Equation 5.9, handover delay incurred in each handover attempt is derived as follows: D j � t � t MD MD � t NS � t � � � t AC AC � t NR, j � � � h n, j � t TAH � t - 97 - AAA (j =1, 2 …) where j means the jth handover attempt. Thus, for Case A (lack of trust association) described in Figure 5.2, the trust relationship verification by the HAAA can be done locally at the visited network by the FAAA. The incurred delay for all the related operations is represented as t auth . The handover delay function for the “no trust association” scenario is given below: m D � tMD �� ( tAC � � � tauth) (j =1, 2 …m) (Equation 5.10) j For Case B (authentication failure) shown in Figure 5.2, the following handover delay function applies: m D � tMD � � �� ( tAC � � � hn, j �tTAH � tAAA) j Because the handover decision computing time � is rather small compared to the total signalling delay, it is omitted in this analysis.
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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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Page 57 and 58: SECURITY FOR HANDOVER ACROSS HETERO
Page 69 and 70: DYNAMIC NEIGHBOUR TRUST INFORMATION
Page 93 and 94: Chapter 5 TRUST ASSISTED HANDOVER A
Page 95 and 96: TRUST ASSISTED HANDOVER ALGORITHM F
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Page 123 and 124: Chapter 6 PROXY BASED AUTHENTICATIO
Page 125 and 126: PROXY BASED AUTHENTICATION LOCALISA
Page 147 and 148: MULTI-INTERFACE MOBILE MODEL FOR ME
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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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