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Dr. Paul Mitchell MEng, PhD, PGCAP, MIET, Senior MIEEE, FHEA

Lecturer & Chair, Board of Studies

Email: pdm106@ohm.york.ac.uk
Tel: +44 (0)1904 32 2415
Fax: +44 (0)1904 32 2335
Research Area: Communications Group

Research Interests

Resource management; Medium access control; Wireless sensor networks; Satellite systems; Cognitive radio; Traffic modelling; Queuing theory

Funded Projects

Energy-efficient medium access control for wireless sensor networks realised through aerial platforms (Principal Investigator of this £193K grant funded by the EPSRC)

Wireless sensor networks represent a rapidly emerging research topic, driven by their potential to extend communications capability beyond the reach of conventional networks for the purpose of monitoring physical conditions in remote and inaccessible locations. Important applications include disaster prevention and environmental monitoring. One of the main limitations of current devices is battery life, since sensor nodes will often be required to operate for a long period of time without external intervention or access to an alternative power source. Energy-efficient operation is therefore of paramount importance.

The medium access control protocol determines the means by which nodes access the shared radio communications medium, and has a major impact on overall energy consumption. The necessity of nodes to self-organise, coordinate transmission/reception, and relay data in a distributed fashion presents particular challenges in achieving energy-efficient operation.

The aim of this research project is to develop more energy-efficient means by which information can be transferred through a sensor network by radio. The potential of an aerial platform (either a plane, balloon, or airship at high altitude) to alleviate the communications burden placed on energy-constrained nodes is to be explored, through centralised coordination of the network or by serving as the direct recipient of sensed data. Such a novel approach is vital to bring about the necessary improvements in energy-efficiency for successful long-term operation in the presence of energy-constrained devices.

Cognitive routing for tactical ad hoc communications (Co-Investigator of this £296K grant funded by the MOD)

Current Student Projects

Previous Student Projects

Teaching Activities

Administrative Roles

Latest 30 Publications

• T. Jiang, D. Grace, P.D. Mitchell,, Efficient Exploration in Reinforcement Learning Based Cognitive Radio Spectrum Sharing, accepted by IET Communications (COM-2010-0258.R1), 2011March, 2011
• T. Wang, R. C. de Lamare, P. D. Mitchell, Low-complexity set-membership channel estimation for cooperative wireless sensor networks, IEEE Transactions on Vehicular Technology, 2011
• H. Li, D. Grace, P. D. Mitchell, Cognitive radio multiple access control for unlicensed and open spectrum with reduced spectrum sensing requirements, WUN COGCOM Workshop at the IEEE International Symposium on Wireless Communication Systems (ISWCS), York, UK, September, 2010
• J. Harbin, P. D. Mitchell, D. A. J. Pearce, Wireless sensor network wormhole avoidance using reputation-based routing, IEEE International Symposium on Wireless Communication Systems (ISWCS), York, UK, September, 2010
• J. Qiu, P. D. Mitchell, D. Grace, Receiver based interference protection for MAC protocols in WSNs, IEEE International Symposium on Wireless Communication Systems (ISWCS), York, UK, September, 2010
• T. Wang, R. C. de Lamare, P. D. Mitchell, BEACON channel estimation for cooperative wireless sensor networks based on data selection, IEEE International Symposium on Wireless Communication Systems (ISWCS), York, UK, September, 2010
• R. Jin, D. Grace, P. D. Mitchell, Cognitive radio for UWC spectrum sharing and power allocation, WUN COGCOM Workshop at the IEEE International Symposium on Wireless Communication Systems (ISWCS), York, UK, September, 2010
• H. Li, D. Grace, P. D. Mitchell, Throughput analysis of non-persistent CSMA combined with TDMA and its implication for cognitive radio, IET Communications, 4(11):1356-1363, July, 2010
• B. Han, D. Grace, P. D. Mitchell, Cognitive greedy-backhaul routing metric exploiting cross-layer design for wireless ad hoc and mesh networks, CROWNCOM, Cannes, France, June, 2010
• J. Qiu, P. D. Mitchell, D. Grace, Traffic-oriented scheduling algorithm for aerial platform based routing and MAC for WSNs, International Wireless Communications & Mobile Computing Conference (IWCMC), Caen, France, June, 2010
• H. Li, D. Grace, P. D. Mitchell, Collision reduction in cognitive radio using multichannel 1-persistant CSMA combined with reinforcement learning, CROWNCOM, Cannes, France, June, 2010
• D. Grace, K. Katzis, D.A.J. Pearce, P.D. Mitchell, Low-Latency MAC-Layer Handoff for a High Altitude Platform delivering Broadband Communications, URSI Radio Science Bulletin - HAPs Special Issue, June, 2010
• T. Wang, R. C. de Lamare, P. D. Mitchell, Low-complexity channel estimation for cooperative wireless sensor networks based on data selection, IEEE Vehicular Technology Conference (VTC), Taipei, Taiwan, May, 2010
• P. D. Mitchell, J. Qiu, H. Li, D. Grace, Use of aerial platforms for energy efficient medium access control in wireless sensor networks, Computer Communications, 33(4):500-512, March, 2010
• B. Han, D. Grace, P. D. Mitchell, Using bottleneck-aware routing to improve end-to-end bottleneck capacity for heterogeneous ad hoc networks, Karlsruhe Workshop on Software Radios (WSR), Karlsruhe, Germany, March, 2010
• T. Jiang, D. Grace, P. D. Mitchell, Improvement of pre-partitioning on reinforcement learning based spectrum sharing, IET International Communication Conference on Wireless Mobile & Computing (CCWMC), 299-302, Shanghai, China, December, 2009
• J. Harbin, P. D. Mitchell, and D. A. J Pearce, Wireless sensor network wormhole avoidance using disturbance-based routing schemes, IEEE International Symposium on Wireless Communication Systems (ISWCS), Siena, Italy, September, 2009
• H. Li and P. D. Mitchell, Full interference model in wireless sensor network simulation, IEEE International Symposium on Wireless Communication Systems (ISWCS), Siena, Italy, September, 2009
• D. Grace, J. Chen, T. Jiang, P.D. Mitchell, Using Cognitive Radio to Deliver ‘Green’ Communications, CROWNCOM'09, Hannover, Germany, June, 2009
• Y. Liu, D. Grace, P. D. Mitchell, Exploiting platform diversity for GoS improvement for users with different high altitude platform availability, IEEE Transactions on Wireless Communications, 8(1):196-203, January, 2009
• P. Likitthanasate, D. Grace, P.D. Mitchell, Performance of Game-based Spectrum Assignment for a Mixed HAP and Multi-terrestrial Base Station System, HAPCOS Workshop 2008, October, 2008
• J. Chen, D. Grace, P. D. Mitchell, System performance enhancement using path gain ratio for cognitive radio systems with diverse transmission ranges, IET Seminar on Cognitive Radio and Software Defined Radios: Technologies and Techniques, London, UK, September, 2008
• P. Likitthanasate, D. Grace, P. D. Mitchell, Performance of a spectrum sharing game with path gain ratio based cost parameter, IET Seminar on Cognitive Radio and Software Defined Radios: Technologies and Techniques, London, UK, September, 2008
• H. Li and P. D. Mitchell, Reservation packet medium access control for wireless sensor networks, IEEE Personal, Indoor and Mobile Radio Communications Conference (PIMRC), Cannes, France, September, 2008
• Y. Liu, D. Grace, P.D. Mitchell, Comparison of CINR-based Cognitive Radio Schemes for Multiple High Altitude Platforms, 2008 International Workshop on Cognitive Networks and Communications (COGCOM2008) in conjunction with CHINACOM'08, Hangzhou, China, August, 2008
• P. Likitthanasate, D. Grace, P.D. Mitchell, Spectrum Etiquettes for Terrestrial and High-Altitude Platform-based Cognitive Radio Systems, IET Communications - Special Issue on Cognitive Spectrum Access, 2(6):846-855, July, 2008
• H. Li, P. D. Mitchell, Feasibility of signal propagation from wireless sensor networks to aerial platforms, Postgraduate Symposium on The Convergence of Telecommunications, Networking and Broadcasting (PGNET), Liverpool, UK, June, 2008
• P. Likitthanasate, D. Grace, P. D. Mitchell, Controlling interaction in mixed high altitude platform and terrestrial cognitive radio systems through modulation level restriction, Nicosia, Cyprus, April, 2008
• J. Chen, D. Grace, P. D. Mitchell, Improving system performance in cognitive radio based wireless systems by using path gain ratio, Karlsruhe Workshop on Software Radios (WSR), Karlsruhe, Germany, March, 2008
• P. Likitthanasate, D. Grace, P. D. Mitchell, Interaction in cognitive radio based systems, Karlsruhe Workshop on Software Radios (WSR), Karlsruhe, Germany, March, 2008
• D. Grace, P. D. Mitchell, T. Clarke, A. G. Burr, D. A. J. Pearce, Cognitive routing for tactical ad hoc communications, Karlsruhe Workshop on Software Radios (WSR), Karlsruhe, Germany, March, 2008

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