LTE系统中一种低丢包率的实时业务调度算法

吴宣利, 韩杏玲, 赵婉君

(哈尔滨工业大学 电子与信息工程学院,150001 哈尔滨)



摘要:

为提高LTE系统中实时业务调度算法的系统丢包率性能,且针对时延优先调度(Delay prioritized scheduler,DPS)算法随着用户数目的增多丢包率性能急剧变差、系统吞吐量也较低等问题,本文在DPS算法基础上,提出一种综合考虑用户时延信息和实时下行信道状态信息的改进算法．通过引入信道状态信息,可以有效提高系统吞吐量;通过引入用户时延信息,可以保证用户之间的公平性．仿真结果表明,该算法在保证实时业务服务质量的前提下,取得了系统吞吐量和公平性之间的良好折中,同时可以获得更低的丢包率性能．

关键词:  LTE  服务质量  丢包率  改进的时延优先调度算法

DOI：10.11918/j.issn.0367-6234.2015.03.004

分类号:TN929.5

基金项目:国家重点基础研究发展计划(2013CB329003); 国家自然科学基金(61301100);国家科技重大专项基金(2013ZX03001024-003).



A low packet loss rate scheduling algorithm for real-time traffics in LTE system

WU Xuanli, HAN Xingling, ZHAO Wanjun

(School of Electronics and Information Engineering, Harbin Institute of Technology, 150001 Harbin, China)

Abstract:

In LTE system, in order to improve system Packet Loss Rate (PLR) performance of scheduling algorithm for real-time traffics and solve the problem that the performance of Delay Prioritized Scheduler (DPS) algorithm will degrade in terms of higher PLR and lower system throughput with the increase of user number, we propose a DPS based scheduling algorithm which considers packet delay and instantaneous downlink channel condition of each user. System throughput can be improved by the utilization of channel conditions for different users, and user fairness can be guaranteed due to the information of different user delay. Simulation results show that the proposed algorithm can be used to achieve the tradeoff between system throughput and user fairness, and reduce PLR significantly under the Quality of Service (QoS) constraints of real-time traffics.

Key words:  LTE  quality of service  packet loss rate  modified delay prioritized scheduler