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Dr Qi Wang PhD

Research Student

Brief biographical information

Qi.Wang@uws.ac.uk

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Mobility support architectures for next-generation wireless networks

With the convergence of the wireless networks and the Internet and the booming demand for multimedia applications, the next-generation (beyond the third generation, or B3G) wireless systems are expected to be all IP-based and provide real-time and non-real-time mobile services anywhere and anytime. Powerful and efficient mobility support is thus the key enabler to fulfil such an attractive vision by supporting various mobility scenarios. This thesis contributes to this interesting while challenging topic. After a literature review on mobility support architectures and protocols, the thesis starts presenting our contributions with a generic multi-layer mobility support framework, which provides a general approach to meet the challenges of handling comprehensive mobility issues. The cross-layer design methodology is introduced to coordinate the protocol layers for optimised system design. Particularly, a flexible and efficient cross-layer signalling scheme is proposed for interlayer interactions. The proposed generic framework is then narrowed down with several fundamental building blocks identified to be focused on as follows. As widely adopted, we assume that the IP-based access networks are organised into administrative domains, which are inter-connected through a global IP-based wired core network. For a mobile user who roams from one domain to another, macro (inter-domain) mobility management should be in place for global location tracking and effective handoff support for both real-time and non-real-lime applications. Mobile IP (MIP) and the Session Initiation Protocol (SIP) are being adopted as the two dominant standard-based macro-mobility architectures, each of which has mobility entities and messages in its own right. The work explores the joint optimisations and interactions of MIP and SIP when utilising the complementary power of both protocols. Two distinctive integrated MIP-SIP architectures are designed and evaluated, compared with their hybrid alternatives and other approaches. The overall analytical and simulation results shown significant performance improvements in terms of cost-efficiency, among other metrics. Subsequently, for the micro (intra-domain) mobility scenario where a mobile user moves across IP subnets within a domain, a micro mobility management architecture is needed to support fast handoffs and constrain signalling messaging loads incurred by intra-domain movements within the domain. The Hierarchical MIPv6 (HMIPv6) and the Fast Handovers for MIPv6 (FMIPv6) protocols are selected to fulfil the design requirements. The work proposes enhancements to these protocols and combines them in an optimised way. resulting in notably improved performances in contrast to a number of alternative approaches.

Dr Qi Wang

Director of studies: Dr Mosa Ali Abu-Rgheff
Other supervisors: Dr Zaki Ahmed

Journal papers

Mobility Management Architectures based on Joint Mobile IP and SIP Protocols
Wang Q, Abu-Rgheff MA
Journal of IEEE Wireless Communications, Volume 13, Issue 6, pp. 68 - 76, 2006
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Signalling Analysis of Cost-Efficient Mobility Support by Integrating Mobile IP and SIP in All IP Wireless Networks
Wang Q, Abu-Rgheff MA
International Journal of Communication Systems, Volume 19, Issue 2, pp. 225-247, 2006
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Next-Generation Mobility Support
Wang Q, Abu-Rgheff MA
IEE Communications Engineer, Volume 1, Issue 1, pp16-19, 2003
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3 Journal papers

Conference papers

IPv6-Based Architecture for Fast and Cost-Effective Micro-Mobility Management
Wang Q, Abu-Rgheff MA
6th IEE International Conference on 3G and Beyond, London, UK, 7-9 Nov. 2005, ISBN: 0 86341 572 5, pp101-105, 2005
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Design and Evaluation of an Integrated Mobile IP and SIP Framework for Advanced Handoff Management
Wang Q, Abu-Rgheff MA, Akram A
Proc. IEEE International Conference on Communications, Paris, France, Volume: 7, pp3921- 3925, ISBN: 0-7803-8533-0, 2004
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Interacting Mobile IP and SIP for Efficient Mobility Support in All IP Wireless Networks
Wang Q, Abu-Rgheff MA
Fifth IEE International Conference on 3G Mobile Communication Technologies (3G 2004) The Premier Technical Conference for 3G and Beyond, London, UK, 18-20 Oct. 2004, ISBN: 0 86341 388 9, pp664–668, 2004
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Cross-Layer Signalling for Next-Generation Wireless Systems
Wang Q, Abu-Rgheff MA
Proc. IEEE Wireless Communications and Networking Conference, Volume: 2, pp1084-1089 vol.2, ISBN: 0-7803-7700-1, New Orleans, LA, USA,, 2003
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A Multi-Layer Mobility Management Architecture Using Cross-Layer Signalling Interactions
Wang Q, Abu-Rgheff MA
5th European Personal Mobile Communications Conference, Glasgow, UK, 22-25 April, ISBN: 0 85296 753 5 , pp237–241 , 2003
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Integrated Mobile IP and SIP Approach for Advanced Location Management
Wang Q, Abu-Rgheff MA
Fourth International Conference on 3G Mobile Communication Technologies, London, UK, pp205-209, ISBN: 0 85296 756 X, 2003
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Towards a Complete Solution to Mobility Management for Next-Generation Wireless System
Wang Q, Abu-Rgheff MA
Proceedings of University College London Communications Symposium 2002 (LCS'02), London, UK, Sep 2002, pp. 281-284., 2002
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7 Conference papers

10 publication(s) - all categories.