LTE系统中提高TCP性能的资源调度算法研究

Resource Scheduling Algorithm to Improve TCP Performance in 3GPP LTE System

LTE可以提供真正无处不在基于IP的移动宽带业务,但随着承载网的IP化,网络拥塞、丢包、抖动、延时等质量问题将影响到LTE业务层的QoS质量.作为LTE无线资源管理的核心,研究并设计一个良好的资源调度算法是提高数据业务的性能和终端用户的体验是一个亟待解决的重要任务.本文通过借鉴LTE对VoIP数据分组的半持续调度算法的思想,提出了一种LTE的无线资源调度的改进方案.方案将TCP确认包映射到具有更高优先级的空闲逻辑信道,从而降低了ACK包在无线信道中发生丢弃和拥塞的概率,避免了TCP拥塞控制机制的频繁开启.仿真结果表明,本文提出的TCP确认包映射转换方案在RTT时延、吞吐量等方面均有一定的提升,具有一定的稳定性和性能优势.

The Lone Term Evolution of UMTS can provide ubiquitous mobile broadband services with all IP architecture,but the QoS of LTE system is seriously affected by the network congestion,packet loss,jitter,latency and other quality problems in all IP network.It is valuable to research and design a efficient resource scheduling algorithm to improve the performance of data services and end-user experience.By drawing on the semi-continuous scheduling algorithm for the VoIP data packets,we present a improvement on radio resource scheduling algorithm.By map the TCP ACK packets to a higher priority logical channel to reducing the ACK packets discarded and congestion probability in the wireless channels,program avoid frequently open of TCP congestion control mechanisms.Simulation shows that the proposed program can enhance the RTT packet delay,throughput,etc.