TD-SCDMA系统导频污染分析

在TD-SCDMA系统中,由于PCCPCH作用的导频污染会导致很多网络问题,如呼叫接通率低、掉话率上升及高BLER等,也会由于干扰的增加导致系统容量的下降,所以在TD-SCDMA系统的网络规划和网络优化中需要重点考虑导频污染的影响。介绍了TD-SCDMA系统中存在导频污染的判断标准,分析了TD-SCDMA系统的导频污染产生的原因及其对网络造成的影响,根据试验网的实际优化工作,由实例验证了针对导频污染的优化方法。

Pilot Pollution Analysis of Time Division-Synchronous CDMA System

In Time Division-Synchronous CDMA systems,pilot pollution because of PCCPCH(Primary Common Control Physical Channel)effect may lead to many network problems,such as low call completion rate,higher call drop rate and high Block Error Ratio,etc.In addition,due to the increase of interference,system capacity will drop off.So,the effect of pilot pollution needs to be considered as a key issue in the network planning and optimization process of Time Division-Synchronous CDMA system.The estimation criterion for pilot pollution existing in Time Division-Synchronous CDMA system is introduced firstly.And then the reasons for pilot pollution and its influence to TD-SCDMA network are analyzed.The optimization methods of pilot pollution are verified by practical example based on actual optimization work.