Positional proportional fairness scheduling based on spectrum aggregation in cognitive radio

In cognitive radio system, it is still a problem that resources scheduling is unfairness if secondary users (SUs) locate at the disadvantage position around the base station when spectrum aggregation technology is involved to support high speed data transmission. A positional proportional fairness scheduling is advised based on spectrum aggregation to solve this problem. This paper focuses on the relation between spectrum aggregation and unfairness of SUs caused by disadvantage position. Bandwidth fairness can be improved as much as possible after considering positional parameters and the remaining data queue length of SUs. Simulation results show that the proposed scheduling takes advantage of bandwidth fairness comparing the scheduling without positional parameters. Meanwhile it presents that the proposed scheduling has lower bandwidth jitter to make sure of fairness among SUs and high efficiency of system.