DEPARTMENT OF ELECTRONIC & ELECTRICAL ENGINEERING

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My research spans across both wired and wireless networks. My research interests include content-centric networks, quality of service (QoS) and service differentiation, resource management (e.g. for satellite networks and wireless mesh networks), cross-layer design (including interaction of protocols at different layers), traffic engineering and network optimisation.

My PhD is in the area of QoS and service differentiation in the context of satellite networks. The thesis investigated the issue of achieving relative service differentiation over bandwidth on demand satellite networks (e.g. DVB-RCS networks). The proportional differentiated services  model is advocated. A complete QoS framework is developed. Separate mechanisms are proposed for the differentiation of three main QoS metrics, namely packet queuing delay, TCP throughput and packet loss rate. A time priority scheduler is implemented to achieve proportional delay differentiation. An implicit cross-layer integrated solution has been developed to achieve TCP throughput differentiation. A fixed point approximation method for multi service class scenario is formulated, enabling analytical approximations for differentiated TCP performance. For packet loss differentiation, a profile-based probabilistic dropper is proposed. Each mechanism provides a separate "tuning knob" for the network provider in configuring the level of service differentiation provided to the users. An alternative approach for relative service differentiation utilising congestion pricing has also been explored in which a feasibility study has been undertaken for both geostationary and non-geostationary satellite systems.

The research projects that I am / was involved in are: -

  • EU ICT FP7 Content Mediator Architecture for Content-aware Networks (COMET)
  • EU IST FP7 Autonomic Internet (AUTOI)
  • Enabling Secure Information Infrastructure (ESII) - funded by UK Ministry of Defence (MoD)
  • EU IST FP6 End-to-End QoS through Integrated Management of Content, Networks and Terminals - Phase II (ENTHRONE-2)
  • EU NoE FP6 Satellite Communications Network of Excellence (SatNEx) I & II.
 
 
 

Last modified 04/02/2010 23:10