关键词: 长期演进, 无线链路控制, 媒体接入控制, 重传, 复用, 调度

Abstract: In Long Term Evolution（LTE） system, the retransmission Protocol Data Unit（PDU）of Radio Link Control（RLC） layer can be only re-segmented but not concatenated. The total size indicated by Medium Access Control（MAC） layer might be greater than RLC PDU to be retransmitted, which results in a waste of resources. Based on the above, a new multiplexing scheme is proposed. In this new scheme, after obtaining the resource size a service needs, the remaining resources will be reallocated to other services. The proposed remaining resources reallocation scheme gives priority to other retransmission services, while the real-time service with the highest priority follows. Some simulations have been done based on multiplexing and scheduling algorithms, which show that the new scheme effectively improves resources utilization, highly increases the throughputs of real-time service with high priority and significantly reduces packet loss rate.

Key words: Long Term Evolution（LTE）, Radio Link Control（RLC）, Medium Access Control（MAC）, retransmission, multiplexing, scheduling