Accessibility statement

Robust Cognitive Radio Based Bandwidth Assignment for Heterogeneous Wireless Networks

Many cognitive radio schemes being developed today rely on spectrum etiquettes to maintain quality of service for their users, and to control impact on primary users. The purpose of this project is to develop Cognitive Radio (CR) techniques that will deliver increased robustness to interference without the need to wholly rely on spectrum etiquettes to control interference. This activity will develop suitable reactive ‘move if interfered’ assignment strategies.

The project will take ideas from frequency hopping spread spectrum and IEEE802.22 (that uses CR and is currently being standardised). While actively in communication, continuous proactive monitoring of spectrum will be performed, possibly using a second receiver, and will determine the most suitable channels to rapidly jump to if subject to excessive interference on the current assignments. This will also be linked with opportunistic scheduling and suitable buffering to better exploit fluctuations in the amount of bandwidth available, and to maintain apparent connectivity. These strategies will be applied to mixed wireless network architectures, incorporating high altitude platform, ad hoc and cellular terrestrial nodes.

A mixture of simulation and analysis will be used to assess performance, and it is expected that game theory and Markov analysis will be particularly important analytical tools. This work will integrate closely with other activities within the Group.

Key objectives

  • To assess the suitability of ‘move if interfered’ strategies for the wideband frequency environment, including an impact on stability of such schemes
  • To compare performance with more conventional spectrum etiquette based approaches
  • To understand the impact on standardisation activities underway that incorporate CR (IEEE 802.22, IEEE 802.16h, IEEE SSC41)
  • To evaluate the benefits of incorporating opportunistic scheduling with such techniques

Outputs

  • "Move if interfered" CR strategies
  • Effect of opportunistic scheduling
  • Simulations and analysis showing likely performance with different communications architectures, and impact on other (including primary) users
  • Contributions to conference and journal papers.

Members

  • Hai Bin Li
  • David Grace
  • Paul Mitchell

Dates

  • October 2007 to
    September 2011

Research