Performance Evaluation of Distributed Scheduling for Downlink Coherent Joint Transmission

Coordinated multi-point transmission (CoMP) has been regarded as one of the key LTE-A technologies. Various CoMP schemes has been extensively investigated,and coherent joint transmission scheme (CJT) has been demonstrated to extract the largest CoMP gains in both cell average performance and cell edge performance. In CJT scheme, multiple coordinated cells constitute a supper cell adopting centralized multi-user scheduling and resource allocation. However, with CoMP cluster size increasing, traditional CJT scheme faces multiple severe challenges, such as the unacceptable computational complexity and more strict latency requirements. In this paper, Distributed scheduling scheme is proposed for downlink CJT to alleviate the computational complexity and other system strict requirements. The complexity of the proposed scheme is analyzed. Comprehensive performance evaluations of the proposed scheme are performed by system level simulations in various transmission scenarios. Taking the performance of single cell as the baseline, the proposed scheme can achieve over 35% cell average gain and over 32% cell edge gain with low complexity.