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Details of Grant 

EPSRC Reference: EP/K005111/1
Title: Radio Resource Allocation for Multi User Spectrum Sharing with Parameter Uncertainty
Principal Investigator: Navaie, Dr K
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department: Electronic and Electrical Engineering
Organisation: University of Leeds
Scheme: First Grant - Revised 2009
Starts: 30 June 2013 Ends: 30 June 2015 Value (£): 99,973
EPSRC Research Topic Classifications:
Networks & Distributed Systems RF & Microwave Technology
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:
Panel DatePanel NameOutcome
18 Jul 2012 EPSRC ICT Responsive Mode - July 2012 Announced
Summary on Grant Application Form
Spectrum sharing (SpS) technology has continued to develop since its introduction as an alternative spectrum management policy by the US's Federal Communication Commission (FCC) in 2002. Radio resource allocation (RRA) is a crucial function in SpS technology which allocates the available radio spectrum to the secondary users and adjusts the transmission parameters such as secondary user transmit power and rate in an efficient way so that the system performance is maximised. RRM is implemented in the secondary network and needs to address the following significant technical challenges. Input parameters to RRA algorithms include spectrum availability and channel gains. Spectrum availability is evaluated using a spectrum sensing mechanism with a certain level of accuracy. The required channel gains are also evaluated using signal processing techniques with a given level of estimation errors. One of the main challenges is that in most cases there is either no or very limited signalling between the primary and secondary networks. This makes parameter estimation a very complicated task with a limited level of accuracy, particularly for those parameters which needed to be measured/estimated in the primary network. Uncertain parameters may result in either decreasing the efficiency, or infeasibility of an RRA algorithm that is designed assuming perfect parameters. It is also required to address efficient and adaptive radio resource allocation among multiple secondary users. Other challenges include distributed implementations as well as developing analytical methods for performance evaluations of RRA algorithms. Performance analysis of RRA function sheds light on the fundamental performance bounds such as maximum achievable spectrum utilization, scaling property regarding the number of secondary users as well as other system trade-offs. Addressing these challenges is required for efficient adoption of SpS technology in full scale commercial wireless communication systems.

The applicant's proposal aims at the theoretical investigation of the impact of parameter uncertainty on the efficiency of the radio resource allocation in multi user secondary service spectrum sharing systems. This proposal also includes development of novel RRA techniques based on the theoretical investigations that differs from many conventional studies, in that practical concerns including robustness to uncertain input parameters, minimizing the level of inter and intra system signalling overhead and impact of multiple secondary service users are also taken into consideration.

The overall aims of this research proposal are: i) to develop an analytical framework which incorporates physical and higher layer functionalities into the system model in a multi secondary user environment and is able to model the impact of uncertainty in the parameters on the network performance, ii) to develop practical RRA algorithms based on this analytical framework to manage the impact of parameter uncertainty, and iii) to obtain fundamental performance limits for the multiple secondary service with uncertain parameters. The applicant's ultimate goal is to make SpS technology available to general public.

Key Findings
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Organisation Website: http://www.leeds.ac.uk