TD-LTE网络上行CoMP方案研究与外场试验

Research and Field Trial of Uplink Coordinated Multipoint Processing in TD-LTE Network

TD-LTE采用同频组网，使得小区间干扰成为限制网络容量提升的主要瓶颈之一。TD-LTE规模试验的测试数据表明，终端有超过70％的概率会同时检测到多个小区的信号。多小区协作（CoMP）技术通过相邻多个小区对信号进行联合处理，可有效降低小区间干扰。介绍了几种上行CoMP的实现方案及仿真性能，并重点介绍在TD-LTE试验网络中开展上行CoMP外场试验的情况。测试结果表明，通过上行CoMP可将小区边缘用户上行吞吐率提升50％-100％，显著改善了用户体验。

TD-LTE is deployed in the same frequency band to improve spectral usage, which also makes the inter-cell interference （ICI） become one of the main bottlenecks of the network capacity. The test results of the large scale TD-LTE field trial demonstrate more than 70% UE could detect signals from multiple cells. The coordinated multi-point processing （CoMP） technology adopts several cell to jointly transmit/receive signals for UE, which could effectively reduce ICI. Several kinds of uplink CoMP scheme were studied. Especially, the field trial of the uplink CoMP in the realistic TD-LTE network was introduced. The test results show that the cell-edge UE could achieve 50%~100% throughput gain via the uplink CoMP technology, which significantly imoroves the user experience.