Joint delay-aware opportunistic scheduling algorithm with reduced feedback to exploit multiuser diversity

The paper deals with a modified version of opportunistic scheduling algorithm that exploits multiuser diversity. It incorporates the proportional fairness scheduling policy with the first-in-first-out (FIFO) policy to obtain a hybrid policy that works well when the channel state information of each mobile user is not necessarily known. In the paper, it is proposed that the channel state information of a mobile user be transmitted to the base station only when its quality is above some threshold value; thus minimising the feedback load. It differs from previous papers in that the algorithm resorts to FIFO policy in case of feedback outages. Yet the numerical results suggest that the system capacity is depreciated only by little as compared to the proportional fairness scheme, while there is a considerable improvement in the performance delay. The additional complexity of implementation is negligible.