Research on access control strategy for a CR-RSMA network

An access control strategy was designed for the cognitive radio-inspired rate splitting multiple access (CR-RSMA) network with multiple secondary users. This strategy aimed to enable more secondary users to access the primary user′s frequency band while ensuring that the primary user achieved the same outage performance as orthogonal multiple access (OMA) and satisfying the quality of service (QoS) requirements for communications of secondary users. The sum throughput of secondary users were maximized on this basis. Considering the QoS constraints of secondary users, the strategy jointly optimized the secondary users′ transmit power allocation factor and the set of accessible secondary users, and derived the closed-form expression of the optimal power allocation factor. Then, the maximum communication rate and minimum communication time of secondary users were obtained. Building upon this, the greedy search algorithm was employed to determine the final set of accessed secondary users. Finally, the strategy optimized time resources to maximize the sum throughput of all admitted secondary users. Simulation results demonstrate that the proposed strategy outperforms the cognitive radio-inspired non-orthogonal multiple access (CR-NOMA) network in terms of the number of accessible users and throughput.