LTE系统上行链路质量提升的方法研究

随着VoLTE业务的商用以及4G用户大规模增加,4G网络不仅承担数据业务,还承担着语音业务,这对上行链路质量提出了更高的要求。在网络结构和无线环境日趋复杂的情况下,LTE链路质量在很大程度上制约着LTE网络性能的发挥,LTE网络受干扰、覆盖或容量受限程度直接影响了通话质量、上传下载速率、业务时延等用户的实际感知,还会引起无法接通、掉话、切换失败等一系列问题事件。本文利用功率余量值PH表征LTE上行链路质量,通过挖掘并调整上行性能参数来快速的提升上行链路质量。结合上海核心城区低功率余量TOP小区的实际情况,探究上海低PHR小区占比高的主要原因,提出一套区别于传统优化方式的参数优化方案以实现低PHR小区占比降低,达到上行链路质量提升的目的。通过试点验证可知,目前核心城区上行低PHR问题小区占比已由3.94%降至1.48%。

Research on Methods of Uplink Quality Improvement in LTE System

With the commercialization of VoLTE services and the large scale increase of 4G users, 4G networks not only undertake data services but also voice services, which puts forward higher requirements for uplink quality. With the increasing complexity of network structure and wireless environment, LTE link quality restricts the performance of LTE network to a great extent. The degree of interference, coverage, or capacity limitation of the LTE network directly affects the actual perception of users such as call quality, upload and download rates, and time delay, and also causes a series of problems such as failure to connect, drop calls and handover failure. In this paper, the power margin value PH is used to characterize the uplink quality of LTE, and the uplink performance parameters are mined and adjusted to quickly improve the uplink quality. Combined with the practical problems of top cells with low power margin in Shanghai"s core urban area, this paper explores the main reasons for the high proportion of low PHR cells in Shanghai, and proposes a set of parameter optimization scheme different from the traditional optimization method, so as to reduce the proportion of low PHR cells and improve the uplink quality. Through pilot verification, it can be seen that the proportion of cells with low PHR problems in the core urban area has been reduced from 3.94% to 1.48%.