QoS-Guarantee Algorithms for Multi-hop Wireless Mesh Networks

Visiting researcher: Mr Yu Chen (UCL)
Host researcher: Prof. Yang Yang (WiCO)
Duration: 2 months

Biography of the visiting researcher

Yu Chen received the BEng degree in Electronic Science and Technology from Beijing University of Posts and Telecommunications (BUPT), Beijing, P.R.China, and the MSc degree in Telecommunications from University College London, London, UK, in 2006 and 2007, respectively. Sponsored by the EU-FP7 project -- Cooperating Objects Network of Excellence (CONET), Yu Chen is currently a Research Assistant in University College London and pursuing his PhD Degree in the field of Communications and Information Systems. His general research interests include wireless mesh networks and beyond 3G mobile communication systems, Wireless Sensor Networks and Cooperating Objects Networks.

Background and Motivation

In recent years, wireless mesh network (WMN) technologies have been actively researched and developed as key solutions to improve the performance and services of WPANs, WLANs and WMANs for a wide variety of applications, such as voice, data and video, in personal, local, campus and metropolitan areas. The consensus in the wireless multi-hop environments is that it greatly facilitates network deployment, improves network robustness, and increases capacity and coverage of networks. The above advantages and applications of WMNs have motivated standards bodies to standardise WMN technologies (e.g. IEEE 802.11s, IEEE 802.16j and IMT-Advanced are new standard drafts which are supporting the wireless mesh networks architecture).
Unlike second generation networks, which only support voice traffic, the third generation networks (e.g. UMTS) have been using QoS classification to support different applications. Their successive networks are aimed at providing QoS guarantees to various applications ranging over video telephony, multi-media streaming and Internet gaming. Thus, the success in the deployment of such networks will critically depend upon how efficiently the wireless networks can support traffic flows with QoS guarantees. The observation of the cruciality for supporting delay sensitive real-time applications motivates us to develop a novel analytical model and a set of practical algorithms to effectively analyse, predict and guarantee end-to-end delay performance for real-time applications in multi-hop WMNs.

Research Activities

  1. We fully investigated the access probability and connectivity probability in multi-hop vehicular networks, which are determined by the densities and radio coverage of BSs and vehicles, as well as the maximum number of hops and wireless channel models. The paper is still under preparation, but will be submitted soon.
  2. We used two hardware instruments, namely National Instruments (NI) PXI, C8 Channel Emulator and a software (Labview) to build a real testbed and analyse the real data.


  1. One technical report.
  2.  One joint publications: Wuxiong Zhang, Yu Chen, Yang Yang, Xiangyang Wang, Yu Zhang, Xuemin Hong and Guoqiang Mao, "Multi-hop Access Probability and Connectivity Probability in Infrastructure-based Vehicular Networks", under preparation;
  3. One patent applications: A real testbed to test the end-to-end delay performance in Wireless Multi-hop Environments. Under construction.
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