Handover mechanisms in next generation heterogeneous wireless ...

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DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING the experiment. These values were particularly selected because of the impact of the size of a region on the number of mobile users required for the NTC distribution as shown in Figure 4.13. Figure 4.14 shows that the NTC PCT for the region is cut down when the number of mobile users increases. The effect of adding more mobile users for facilitating the NTC distribution is the most prominent when the number of mobile users per cell is above the minimum number needed. It is observed the NTC PCT when the mobile users were having different MCRTs. Generally, mobile users with high MCRT require less time to get the NTC data distributed. This means that the mobility pattern of a mobile user plays a role in determining the NTC PCT. However, the role of the MCRT in determining the NTC PCT tends to be less important when the number of mobile users per cell increases to a certain extent, e.g. 2 for the region of 10 rings, and 3.2 for the region of 6 rings as shown in Figure 4.15. Figure 4.15 Number of mobile users per cell vs. regional NTC pattern construction time Next, the experiment moves on to evaluate the accuracy of the PSMN in the NTC distribution. As discussed early, mobile users in a dormant state can be chosen to participate in the NTC distribution. However, under the PSMN, Equation 4.7 has to be - 78 -
DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING satisfied to make sure that the neighbouring relationship is correctly obtained. That means that the NTC update interval is restrained by a threshold, which is jointly determined by a user’s mobility pattern and the extent of the radio overlap. The skip of a particular cell during the NTC update may result in non-adjacent cells being derived as being neighboured. The NTC exchange error rate represents the ratio of the NTC exchanges wrongly conducted to the total NTC exchanges expected for the topology. Figure 4.16 shows that the maximum allowable NUI varies as the MCRT changes. Generally, the NTC exchange error rate increases when the NTC update interval is widen. According to the simulation results, the maximum allowable NUI is 4 mins for MCRT=10mins, 14 mins for MCRT=30mins, and 32 mins for MCRT=50mins. The results suggest that the NUI should be adjusted according to the mobility pattern of the NTC participants in the PSMN. Figure 4.16 NTC update interval vs. NTC exchange error rate - 79 -
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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
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
Page 123 and 124: Chapter 6 PROXY BASED AUTHENTICATIO
Page 125 and 126: PROXY BASED AUTHENTICATION LOCALISA
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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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