DAS:GSPN成员载波动态自适应调度策略  

DAS:Generalized Stochastic Petri Nets Approach to Component Carrier Dynamic Adaptive Scheduling

作　　者：贾玉栋[1] 陈昕[1] 向旭东[2] 

机构地区：[1]北京信息科技大学计算机学院,北京100101 [2]北京科技大学计算机与通信工程学院,北京100083

出　　处：《计算机科学》2016年第11期111-116,共6页Computer Science

基　　金：国家自然科学基金(61370065;6150200);国家科技支撑计划(2015BAK12B03-03)资助

摘　　要：随着移动业务需求的多样化,有限的无线频谱资源已无法满足用户对高质量、高效率和高带宽的数据业务的需求。在现有的低频载波环境下,引入高频载波可以有效扩大系统容量。在同一小区部署多个成员载波的过程中,成员载波调度策略是其中的关键问题之一,直接影响LTE用户的服务质量(Qulity of Service,QoS)和无线资源的利用率。针对蜂窝网络中成员载波的调度策略问题,采用广义随机Petri网(Generalized Stochastic Petri Nets,GSPN)方法建立了多成员载波系统模型,同时在分析用户业务类型和成员载波特性的基础上,提出了一种动态自适应调度策略(Dynamic Adaptive Scheduling,DAS)。通过TimeNets仿真工具,对系统中成员载波选择、用户排队机制和资源块(Resource Block,RB)分配等要素构建仿真环境。仿真实验结果表明:一方面,动态自适应调度策略(Dynamic Adaptive Scheduling,DAS)的掉线率低于基于服务类型的调度策略(Based-Service Scheduling,BSS)和最短队列优先调度策略(Shortest Queue priority Scheduling,SQP);另一方面,在相同的到达率的前提下,在到达率较低时,其吞吐量逼近于基于服务类型的调度策略BSS;在到达率较高时,逼近于最短队列优先调度策略SQP。As users＇ demand for mobile services shows diversity trend,the demand of limited wireless spectrum resource has been unable to meet the demand of high-quality,high-efficiency and high-bandwidth data services.By introducing the high frequency carrier in the low frequency carrier environment,it will improve the system capacity.However,with multiple component carriers deploying in a cellular,how to design an effective scheduling strategy becomes one of the key issues in improving the quality of service requirements and making radio resource more efficient for LTE users.In light of the component carriers scheduling problem,we built the multiple component carriers systems by Generalized stochastic Petri nets.Meanwhile,based on the analysis of the types of users＇ services and characteristics of component carriers,a dynamic adaptive scheduling（DAS）strategy was proposed.Through the use of TimeNets simulation tool,an emulation environment which includes component carrier selection,LTE users queue mechanism and resource block allocation was set up.The simulation result shows that compared with the based-service scheduling（BSS）strategy and the shortest queue priority scheduling（SQP）strategy,the drop probability of DAS strategy is lower.Besides,in terms of throughput,DAS strategy is close to BSS strategy when arrival rate is low and close to SQP strategy when arrival rate is high.

关 键 词：成员载波 LTE 广义随机Petri 掉线率 吞吐量 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]