杜杨+杨奥林+朱革

【摘 要】TD-LTE由于网络架构、工作频段等原因，更容易在相邻站点之间出现重叠覆盖区域。为了改善TD-LTE网络中小区重叠覆盖对网络造成的影响，首先介绍了重叠覆盖的判断思路，接着给出了一种小区重叠覆盖优化方法，该方法是通过联合优化小区重叠覆盖区域信号干扰水平和信号接收强度来减少重叠覆盖。通过测试分析得知，该方法可以有效提高吞吐量和降低小区重叠覆盖程度，具有一定的可行性和推广性

TD-LTE由于网络架构、工作频段等原因，更容易在相邻站点之间出现重叠覆盖区域。为了改善TD-LTE网络中小区重叠覆盖对网络造成的影响，首先介绍了重叠覆盖的判断思路，接着给出了一种小区重叠覆盖优化方法，该方法是通过联合优化小区重叠覆盖区域信号干扰水平和信号接收强度来减少重叠覆盖。通过测试分析得知，该方法可以有效提高吞吐量和降低小区重叠覆盖程度，具有一定的可行性和推广性。

【关键词】TD-LTE 重叠覆盖 吞吐量 SINR RSRP

Investigation on the Cell Overlapping Coverage Optimization

in TD-LTE Networks

[Abstract]In view of the network architecture and the frequency， the overlapping coverage area is apt to appear between adjacent cells in TD-LTE networks. In order to mitigate the impact of the overlapping coverage area on TD-LTE networks， the judgment method of the overlapping coverage was introduced. An optimization method of the overlapping coverage was presented， which can reduce the overlapping coverage by jointly optimizing the interference plus noise ratio （SINR） and the reference signal receiving power （RSRP） in the overlapping coverage area. Tests demonstrate that the method can effectively improve the throughput， reduce the overlapping coverage and have the moderate validity and feasibility.

[Key words]TD-LTE overlapping coverage throughput SINR RSRP

1 引言

TD-LTE[1]作為第四代移动通信国际标准，采用同频组网方式，在增加频谱利用率的同时，也增加了小区边缘用户受干扰的几率。由于TD-LTE具有干扰敏感性，将会对小区边缘吞吐量、覆盖等造成影响。文献[2]介绍了重叠覆盖的概念，对于某个采样点，监听到的邻区信号强度与其主服务小区RSRP相差在6 dB，同时个数（包含服务小区）大于3的时候，即存在重叠覆盖。TD-LTE在网络建设初期多采用与TD-SCDMA共站址的模式，TD-SCDMA的工作频段和特点导致了即使TD-SCDMA基站结构布局合理，也不等于TD-LTE结构就完全合理的问题。……