Radio Resource Management in Cognitive Radio Networks

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Cognitive radio is a new concept, which is introduced to solve the spectrum scarcity issue in wireless communications by allowing the share of licensed spectrum with unlicensed users. For cognitive radio based wireless networks, the provisioning of both efficient spectrum utilization and stable services is critical and technically challenging. The proposed research will address this issue through achieving dynamic spectrum allocation between licensed and unlicensed users under the consideration of practical limitations on hardware, spectrum mobility, multihop transmission, and wireless channels. In particular, the proposed research will develop (i) distributed resource allocation algorithms for improved spectrum utilization and quality of service provisioning; (ii) robust resource management mechanisms to combat the potential spectrum sensing errors; (iii) distributed call admission control methods to guarantee the quality of service satisfaction to both new and existing calls; (iv) mathematical models for capacity analysis at both packet and call levels; and (v) effective spectrum handoff methods for smooth and seamless information dissemination among unlicensed users.