关键词: 成员载波,LTE,广义随机Petri,掉线率,吞吐量

Abstract: 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.Howe-ver,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.

Key words: Component carrier,LTE,GSPN,Drop probability,Throughput