OFDMA系统随机服务模型及呼叫接纳控制策略的研究

Research on Stochastic Model and Call Admission Control Strategy of Adaptive OFDMA System

该文在分析OFDMA系统容量的基础上,提出了适用于自适应OFDMA系统的随机服务模型,即M|M|m|n马尔可夫排队模型,根据这个模型,我们提出了基于系统吞吐量和用户QoS要求的呼叫接纳控制策略。理论分析和仿真结果表明,当系统中只有FTP业务时,M|M|m|n模型与自适应OFDMA系统的随机服务特征非常相似,应用这个模型对系统的阻塞概率和文件的服务时间进行定量分析,其结果与实际系统的性能基本吻合。

Based on the analysis of OFDMA system capacity, a stochastic model, M｜M｜m｜n Markov queue model, is proposed. According to the model, the call admission control strategy is presented, where .the number of call connections into the network is limited by the system throughput and user＇s QoS requirements. The results demonstrate that the M｜M｜m｜n model is suitable to adaptive OFDMA system supporting for FTP service, and the curves of blocking probability verse arrival rate and average service time verse arrival rate achieved by it coincide with that provided by the simulating results.