基于接入概率的LTE小区重选优化算法分析

摘要

In 3G network, AC (Access Class) check is performed by UEs before initiating a RRC connection. In some cells with low access probability, UEs may try many times to access the serving cell due to low access probability which results in higher connection failure and longer access delay. Therefore, we propose a better algorithm based on access probability to optimize former cell reselection R criteria, so that the UEs in serving cell with low access probability shall be more likely to reselect a cell with higher access probability. The proposed methods are analyzed in a simplified model and computer simulation is used to evaluate the performance. Then, we use the access probability to evaluate the proper hysteresis parameter setting.%在3G网络中,UE(用户设备)在建立RRC(无线资源控制)连接之前会进行接入等级检查.在一些具有低接入概率的小区中,UE可能会由于低接入概率而尝试多次接入服务小区,从而导致较高的失败连接次数和更长的接入延迟.提出一种基于接入概率的小区重选优化算法对于小区重选R准则算法进行优化,进而使处于服务小区内低接入概率的UE更容易重选到高接入概率的邻小区,并通过建模和仿真分析了算法的性能;结合接入概率对小区重选中的相关参数进行了分析,提出合适的参数设置.