Handover mechanisms in next generation heterogeneous wireless ...

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TRUST ASSISTED HANDOVER ALGORITHM FOR RELIABLE HANDOVER Figure 5.3 Trust-assisted handover algorithm flow chart Trust coefficient � n is intended to make the candidate networks having weak trust relationship to home network less desirable in regards for network selection. Next, the derivation of the trust coefficient function is explained for the NTC model of Figure 4.3. h n represents the Trust Association Hop (TAH) count between a visited network and a mobile’s home network. Intuitively, as the TAH count h n grows, � n is expected to decrease so that the handover cost of switching to network n is increased according to (Equation 5.5). Generally, a handover algorithm should be encouraged to select those networks “close” to a mobile’s home network (measured by trust relationship) in most cases. So, the values of � n for low hop count should be closer to 1 such that the handover costs f n of the networks closer to the MH’s home network still - 92 - fn
TRUST ASSISTED HANDOVER ALGORITHM FOR RELIABLE HANDOVER remain low. This will make those networks having close trust relationship with the MH’s home network remain competitive in network selection. As soon as h n reaches a predefined TAH threshold, � n should drop rapidly to zero and thus exclude network n as a candidate for handover. This is justified by the fact that too many third parties involving in intermediating AAA messages may become inefficiency and weaken the reliability of handover. The predefined TAH threshold is denoted as Effective TAH Scope (ETS, H eff ). The ETS indicates how network trust relationship may have an impact on handover related AAA. Based on the above analysis, it was found that the reciprocal of inverse tangent function can provide the logic for the trust coefficient function. Figure 5.4 shows the curves of the proposed trust coefficient function, compared with a reciprocal of an exponential function. Figure 5.4 Trust coefficient function (with H � 6) The trust coefficient function is represented as follows: 5.6) H effective 1 � n � hn e Effective scope of TAH � �hn�H�� gradient of the curve at P �� n � d � � � arctan eff (Equation � 2 - 93 - (3) gradient of the curve at Q eff
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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 53 and 54: SECURITY FOR HANDOVER ACROSS HETERO
Page 69 and 70: DYNAMIC NEIGHBOUR TRUST INFORMATION
Page 93 and 94: Chapter 5 TRUST ASSISTED HANDOVER A
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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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