一种基于QoS的星座通信系统跨层资源分配算法
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摘要
针对目前星座通信系统星地链路资源分配不灵活、缺乏有效服务质量(QoS)保障机制等问题,提出一种基于QoS的星座通信系统跨层资源分配算法.利用自适应编码调制(ACM)技术,通过定义用户信道质量评估算法、可调公平性调度算法、业务QoS分类调度算法及用户业务分配权重函数,为终端用户指定工作频率、时隙、编码方式、调制方式等物理层工作参数,实现根据业务QoS保障要求灵活分配物理层信道资源,达到提高系统资源利用率与满足业务QoS保障需求的平衡.仿真实例验证该算法可以实现星座通信系统根据业务QoS和用户信道质量对星地链路资源的合理分配和调度.
In viewof the problem that the satellite-ground link resource allocation is not flexible,and the effective Qo S( quality of service) guarantee mechanism is lacking,a cross layer resource allocation algorithm for constellation communication system is proposed on the basis of Qo S. By using adaptive encoding modulation( ACM) technology, and defining user channel quality assessment algorithm, adjustable fairness scheduling algorithm, Qo S business classification scheduling algorithm and user service allocation weight function,the terminal user can be specified physical layer parameters such as working frequency,time slot,coding mode,modulation mode,and etc. The allocation of physical layer channel resources could be realized flexibly according to the Qo S security requirements,and the balance could be reached between enhancing the system utilization rate and meeting the Qo S security requirements. The simulation results showthat the proposed algorithm can achieve the reasonable scheduling of satellite-ground link resources based on the business Qo S and user channel quality.
In viewof the problem that the satellite-ground link resource allocation is not flexible,and the effective Qo S( quality of service) guarantee mechanism is lacking,a cross layer resource allocation algorithm for constellation communication system is proposed on the basis of Qo S. By using adaptive encoding modulation( ACM) technology, and defining user channel quality assessment algorithm, adjustable fairness scheduling algorithm, Qo S business classification scheduling algorithm and user service allocation weight function,the terminal user can be specified physical layer parameters such as working frequency,time slot,coding mode,modulation mode,and etc. The allocation of physical layer channel resources could be realized flexibly according to the Qo S security requirements,and the balance could be reached between enhancing the system utilization rate and meeting the Qo S security requirements. The simulation results showthat the proposed algorithm can achieve the reasonable scheduling of satellite-ground link resources based on the business Qo S and user channel quality.
引文
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[2]左青云,陈鸣,赵广松,等.基于Open Flow的SDN技术研究[J].软件学报,2013,24(5):1078-1097.(Zuo Qing-yun,Chen Ming,Zhao Guang-song,et al.Research on Open Flow based SDN technologies[J].Journal of Software,2013,24(5):1078-1097.)
[3]Rossi T,Sanctis M D,Cianca E,et al.Future space-based communications infrastructures based on high throughput satellites and software defined networking[C]//IEEE International Symposium on Systems Engineering.Rome,2015:29-30.
[4]Bertaux L,Medjiah S,Berthou P,et al.Software defined networking and virtualization for broadband satellite networks[J].IEEE Communications Magazine,2015,53(3):54-60.
[5]Bao J,Zhao B,Yu W,et al.Open SAN:a software-defined satellite network architecture[J].Acm Sigcomm Computer Communication Review,2014,44(4):347-348.
[6]Ojo J S,Rotimi O C.Diurnal and seasonal variations of rain rate and rain attenuation on Ku-band satellite systems in a tropical region:asynthetic storm techniques approach[J].Journal of Computer&Communications,2015,3(4):1-10.
[7]Kang D B,Kyu P M,Chang D I,et al.A design and performance evaluation for DVB-S2 ACM using rain attenuation data of COMS(communication,ocean and meteorological satellite)(JC-SAT 2011)[J].Technical Report of Ieice Sat,2011,111:23-28.
[8]Vieira F,Castro M A V,Granados G S.A tunable-fairness crosslayer scheduler for DVB-S2[J].International Journal of Satellite Communications&Networking,2006,24(5):437-450.
[9]Park M K,Kang D B,Oh D G.Two-step scheduling scheme to support fairness and Qo S in DVB-S2 system[J].Ksii Transactions on Internet&Information Systems,2015,9(11):4419-4435.