Data-Apart Hybrid Centralized Scheduling in Coordinated Multi-Point System with Non-ideal Backhaul Link

Abstract

Coordinated Multi-Point (CoMP) transmission is a promising technique to improve the coverage of high data rates, the cell-edge throughput in cellular networks, in which centralized CoMP can obtain global optimal cooperation when CU can gather CoMP information (including CSI) and send scheduling decisions without delay. However, due to the imperfect channel characteristic, there is CSI latency during the cooperation, which will decrease the CoMP gain. In this paper, we propose a modified centralized CoMP scheme called DAHCS (Data-Apart Hybrid Centralized Scheduling), in which user data process is set apart from CU and a hybrid structure scheduling is adopted to schedule CoMP UEs intensively and non CoMP UEs locally. Simulation results show that the proposed DAHCS CoMP outperforms the traditional method when a lower capacity/higher latency backhaul link is considered.