Resource Allocation for Spectrum Underlay in Cognitive Radio Networks
A resource allocation framework is presented for spectrum underlay in cognitive wireless networks. The authors consider both interference constraints for primary users and Quality of Service (QoS) constraints for secondary users. Specifically, interference from secondary users to primary users is constrained to be below a tolerable limit. Also, Signal to Interference plus Noise Ratio (SINR) of each secondary user is maintained higher than a desired level for QoS insurance. They propose admission control algorithms to be used during high network load conditions which are performed jointly with power control so that QoS requirements of all admitted secondary users are satisfied while keeping the interference to primary users below the tolerable limit.