GEO卫星LTE跨层资源调度算法
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摘要
地球同步轨道(GEO)卫星通信系统具有通信时延长的特点,适用于GEO卫星长期演进(LTE)通信的资源调度算法非常重要。为提升星上资源分配的高效性,基于可变最大加权时延优先(M-LWDF)算法,提出了一种综合考虑媒体接入控制(MAC)层参数和应用层参数的跨层调度算法。该算法在MAC层从数学角度推导,提出权重更大的时延判决因子及在应用层根据业务优先级不同引入Q因子。仿真结果表明,与M-LWDF算法相比,不同业务情况下,跨层资源调度算法减小了通信时延,提高了系统吞吐量,但公平性能略有下降并增加了复杂度。
Considering the characteristic of long transmission delay in Geosynchronous Orbit(GEO) satellite communication system, it is very important to put forward an applicable resource scheduling algorithm for GEO satellite Long Term Evolution(LTE) system. Based on the Modified Largest Weighted Delay First(M-LWDF) algorithm, a cross-layer scheduling algorithm is proposed with the comprehensive consideration of parameters in the Media Access Control(MAC) layer and application layer for enhancing the efficiency of resources allocation. Specifically, a greater weight delay factor is put forward from the point of mathematical deduction in the MAC layer, in addition to introducing Q factor into the application layer according to service priorities. Comparing with M-LWDF algorithm, the simulation results show that the cross-layer based resource scheduling algorithm can reduce transmission delay and improve the throughput for different traffics, whereas fair performance decreases slightly and the complexity increases.
Considering the characteristic of long transmission delay in Geosynchronous Orbit(GEO) satellite communication system, it is very important to put forward an applicable resource scheduling algorithm for GEO satellite Long Term Evolution(LTE) system. Based on the Modified Largest Weighted Delay First(M-LWDF) algorithm, a cross-layer scheduling algorithm is proposed with the comprehensive consideration of parameters in the Media Access Control(MAC) layer and application layer for enhancing the efficiency of resources allocation. Specifically, a greater weight delay factor is put forward from the point of mathematical deduction in the MAC layer, in addition to introducing Q factor into the application layer according to service priorities. Comparing with M-LWDF algorithm, the simulation results show that the cross-layer based resource scheduling algorithm can reduce transmission delay and improve the throughput for different traffics, whereas fair performance decreases slightly and the complexity increases.
引文
[1]陈坤汕,王大鸣,徐尧.面向LTE的静止轨道卫星通信系统随机接入方式[J].太赫兹科学与电子信息学报,2013,11(5):707-711.(CHEN Kunshan,WANG Daming,XU Yao.Random access method for GEO satellite communication system oriented LTE[J].Journal of Terahertz Science and Electronic Information Technology,2013,11(5):707-711.)
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[8]张馨月.卫星通信系统跨层资源管理技术研究[D].哈尔滨:哈尔滨工业大学,2014.(ZHANG Xinyue.Research on resource management of cross-layer design technology over satellite system[D].Harbin,China:Harbin Institute of Technology,2014.)
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[10]姚丹,崔维嘉,季仲梅.基于QCI优先级的分组调度算法[J].计算机工程,2011,37(9):141-143.(YAO Dan,CUI Weijia,JI Zhongmei.A QCI-based priority algorithm of packet scheduling[J].Computer Engineering,2011,37(9):141-143.)
[2]费长江,吴纯青,赵宝康,等.一种卫星移动通信语音业务半持续调度机制[J].湖南大学学报:自然科学版,2015,42(8):108-115.(FEI Changjiang,WU Chunqing,ZHAO Baokang,et al.A semi-persistent scheduling mechanism for voice service in satellite mobile communication[J].Journal of Hunan University:Natural Sciences Edition,2015,42(8):108-115.)
[3]FEI C J,ZHAO B K,WU C Q,et al.Towards efficient radio resource scheduling in LTE-based satellite mobile communication system[C]//2015 IEEE Conference on Computer Communications Workshops.Hong Kong,China:IEEE,2015:167-172.
[4]AIYETORO G,GIAMBENE G,TAKAWIRA F.A new packet scheduling algorithm in satellite LTE networks[C]//AFRICON,2013.Pointe-Aux-Piments,Mauritius:IEEE,2013:1-6.
[5]AMEIGEIRAS P,WIGARD J,MOGENSEN P.Performance of the M-LWDF scheduling algorithm for streaming services in HSDPA[C]//IEEE 60th Vehicular Technology Conference,2004.Los Angeles,CA,USA:IEEE,2004:999-1003.
[6]AIYETORO G,TAKAWIRA F.A cross-layer based packet scheduling scheme for multimedia traffic in satellite LTE networks[C]//2014 6th International Conference on New Technologies,Mobility and Security.Dubai:IEEE,2014:1-6.
[7]杨俊蓉,樊自甫.基于时延和速率效用函数的LTE无线资源调度算法研究[J].数字通信,2011,38(2):57-60.(YANG Junrong,FAN Zifu.Based on the utility function of delay and rate for LTE resource scheduling algorithms[J].Digital Communication,2011,38(2):57-60.)
[8]张馨月.卫星通信系统跨层资源管理技术研究[D].哈尔滨:哈尔滨工业大学,2014.(ZHANG Xinyue.Research on resource management of cross-layer design technology over satellite system[D].Harbin,China:Harbin Institute of Technology,2014.)
[9]赵立群.LTE中基于业务分类的调度算法[D].哈尔滨:哈尔滨工业大学,2012.(ZHAO Liqun.Scheduling algorithm based on differentiated service in LTE[D].Harbin,China:Harbin Institute of Technology,2012.)
[10]姚丹,崔维嘉,季仲梅.基于QCI优先级的分组调度算法[J].计算机工程,2011,37(9):141-143.(YAO Dan,CUI Weijia,JI Zhongmei.A QCI-based priority algorithm of packet scheduling[J].Computer Engineering,2011,37(9):141-143.)
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