Handover mechanisms in next generation heterogeneous wireless ...

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TRUST ASSISTED HANDOVER ALGORITHM FOR RELIABLE HANDOVER 5.7 Conclusion Current known handover approaches such as the MHOA, which were designed for dealing with the network heterogeneities can not deal with the coexistence of multiple network operators. Other solutions such as network-controlled and mobile-controlled operator lists specified by IETF have been proposed to address this deficiency, but only as an add-on to network selection [72]. Unfortunately, they are unable to effectively support the changes of network trust relationship between networks. Current handover solutions have to rely on other mechanisms that appear as an add-on to support AAA in a handover rather than forming an integral part of their handover algorithms. The trust-assisted handover algorithm is presented to address this problem, since it is anticipated that it would become common as more and more independent operators are involved in interworking. The proposed THOA algorithm provides an efficient and flexible approach to deal with complex network trust relationship during a mobile’s handover decision making. At the mobile terminal, the network trust information about neighbours that is sent by the serving network is fed into the mobile’s handover decision algorithm. Either the mobile user or its home network operator can set handover policies to adjust the THOA ETS, and thus influence handover AAA delay. The simulation results showed that the THOA can provide a more reliable handover, and result in a 35% reduction in handover delay compared with the MHOA. By tuning the THOA ETS, it was shown that traffic can be evenly distributed among the POAs. It was shown that the implementation of the THOA would not compromise QoS, which is a very important consideration in deploying real wireless networks. - 110 -
Chapter 6 PROXY BASED AUTHENTICATION LOCALISATION 6.1 Introduction SCHEME FOR HANDOVER In Next Generation Networks, a number of heterogeneous and distributed wireless networks are expected to converge and have a common all-IP network architecture [6] These technologies could range from Wireless Local Area Network (WLAN) such as IEEE 802.11, to the third generation (3G) cellular networks such as Universal Mobile Telecommunications System (UMTS). These heterogeneous wireless networks are expected to co-exist as overlay networks and enable ubiquitous data services and provide very high data rates in strategic locations [4]. The interworking of different wireless systems and the demand for ubiquitous services present enormous challenges to network security [13, 52]. The trust model for wireless network is identified by three mutual trust relations between network entities [52]: two explicit trust relations between a Mobile Host (MH) and its home network, and between the home network and the Access Network (AN), in addition to one implicit trust relation between the MH and the AN as shown in Figure 6.1. The implicit trust relation between the MH and the AN is often dynamically established during the handover attachment to the AN. The MH and the AN must verify each other during the handover to make sure that both hold a trust relation to MH’s home network. Such identity verification in a handover, better known as mutual authentication, often needs the involvement of the home network. - 111 -
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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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DYNAMIC NEIGHBOUR TRUST INFORMATION
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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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