Handover mechanisms in next generation heterogeneous wireless ...

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DYNAMIC NEIGHBOUR TRUST INFORMATION RETRIEVAL FOR GLOBAL ROAMING 4.7 Conclusion In this chapter, a network trust information retrieval scheme for global seamless roaming is presented. To the best of the author’ knowledge, it is the first of its kind that addresses the seamless roaming problem in a multi-operator environment. The proposed scheme makes use of a mobile user’ mobility and handover process to exchange network trust information between neighbouring networks without any direct communication. In this way, a network can build up its neighbour network trust pattern. As a result, a mobile user would no longer need to carry network trust information for roaming with it all the time, e.g. resorting to a locally cached network identifier list. The network trust information related to neighbouring networks can be dynamically provided by the serving network. To evaluate the performance of the proposed scheme, a series of simulations have been conducted. The simulation results show that the proposed trust information retrieval scheme can function in a cost-effective manner, generating an additional signalling overhead of 3.7% on networks compared with the standard handover signalling cost. Moreover, it was shown that one mobile user per network would be sufficient to establish a complete network trust pattern in most cases when the proposed scheme is widely deployed in networks. For real deployment, this makes sure that its implementation would not be a burden for networks in operation. It was found that the time needed for constructing neighbour trust pattern can be speeded up by increasing the number of mobile users involved. - 80 -
Chapter 5 TRUST ASSISTED HANDOVER ALGORITHM FOR 5.1 Introduction RELIABLE HANDOVER Homogeneous wireless networks generally employ a centralised handover approach [31, 81, 82], e.g. Network-Controlled Handover (NCHO), in which network-end components make handover decisions. However, in Next Generation (NG) Heterogeneous Wireless Networks, it is widely envisioned that the decentralised Mobile-Controlled Handover (MCHO) would be a better choice [31, 81]. In recent years, there have seen a number of papers [82-85] investigating how handover decisions should be made in heterogeneous wireless networks. It is commonly proposed [83-85] that multiple handover metrics, such as Received Signal Strength (RSS) [86], service type, and bandwidth, shall be considered in the handover decision process so as to be “always best connected” [34]. The notion of “always best connected” means that a mobile user is always connected through the best available device and access technology at all times [34]. At present, handover decision processes tend to adopt a cost-based approach, which employs multiple handover metrics for the sake of Quality of Service (QoS). The current approaches have been specifically designed to address the heterogeneity challenges of handover [13] arising from the interworking of multitechnology networks. However, in NG Wireless Networks, disparate network domains may belong to multiple network operators, and rely on their roaming agreements to collaborate between each other [87]. Roaming agreements are subject to changes with time, and this can subsequently affect trust relationships between the interconnected networks. - 81 -
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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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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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