LTE-Advanced中继系统中的VoIP业务系统性能研究

Performance Analysis of the VoIP Service in the LTE-Advanced Relaying Networks

对基于中继传输的LTE-Advanced下行系统中的数据包传输机制进行了分析,并提出基于最大时延优先调度准则(MLWDF,modified largest weighted delay first)的分布式中继系统Voice overInternet Protocol(VoIP)业务调度方案。基于LTE-Advanced时分复用(TDD,time division duplexing)系统搭建系统级仿真平台,并且分别考虑每扇区部署不同数量的中继站及设定不同的下行链路控制信道数(PDCCH,physical downlink control cHannel)对VoIP性能的影响。仿真结果表明,提出的VoIP调度方案能够很好的应用于分布式中继系统中的VoIP业务传输,相比较无中继系统,中继系统中用户的VoIP数据包时延性能得到明显改善,VoIP容量得到了很大的提升。

The performance of the Voice over Internet Protocol（VoIP） service in the third generation（3G） long-term evolution（LTE）-Advanced relaying networks is researched.Based on the Modified Largest Weighted Delay First（MLWDF） scheduling criterion,an optimized VoIP scheduling algorithm is proposed.To analyze the performance of the algorithm,a Time Division Duplexing（TDD） system simulation platform is constructed.In the simulations,different number settings of Physical Downlink Control Channel（PDCCH） and relay nodes deployment are taken into account.The system simulation results show that by deploying multihop relays,the packet delay of cell edge users can be dramatically decreased.Moreover,the VoIP capacity of the system can also be increased obviously.