基于道路测试大数据的TD-LTE影子邻区优化方法

Optimization of TD-LTE shadow neighbor cells based on big data of road test

CSFB作为LTE语音解决方案之一,已被众多终端厂商采纳。受其回落机制的影响,网络中存在一类超远覆盖且电平很强的2G影子邻区,虽现网未配置邻区但能让终端成功回落,并在回落后引起语音业务的质差甚至掉话。指出了影子邻区的存在,提出了一种基于道路测试大数据的TD-LTE影子邻区优化方法,挖掘出杭州移动现网中存在的影子邻区,并通过天馈调整和频点调整进行优化。实验结果表明,本文提出的方法切实有效,并值得推广。

CSFB has been adopted by many terminal manufacturers as one of the LTE voice solution. Restricted by CSFB mechanism, there exists one kind of GSM neighbor cell which is referred as shadow neighbor cell. Even without neighbor relations configured, shadow neighbor could lead UE（user equipment）to fall back successfully due to itsultra-long coverage and strong Rx level, and that would probably causes problems like dropped calls. Based on large data of road test and network of China Mobile Hangzhou Branch, the existence of shadow neighbor cell was pointed out, an optimization method of TD-LTE shadow neighbor cell was proposed, the hidden shadow neighbor cells were dug out, and they were eliminated by adjustments of antenna and frequency. Experimental results show that the method proposedis practical, effective and also worthy promotion.