Admission control algorithm of multi-service cellular relay system

This paper investigated the admission control problem in multi-service cellular relay system with orthogonal frequency division multiplexing access (OFDMA). Subjected to a hard constraint on the quality-of-service (QoS) requirements and the capability of relay, the admission problem could be described as the problem of maximizing the amount of subcarriers saved by relaying transmission. With further consideration of the user´s selection of relays and the competence among users, several new algorithms were proposed. Meanwhile, the application in multi-service scenario was taken into account, and the effect caused by the ratio of services with different transmission rate requirements was studied. Simulation results verify that the presented algorithms can obtain more admitted users, less block probability and more saved subcarriers, thus effectively enhancing the system capacity and resource utilization.