Call Admission Control (CAC) is one of the key traffic management mechanisms that must be deployed in order to meet the strict requirements for dependability imposed on the services provided by modern wireless network...Call Admission Control (CAC) is one of the key traffic management mechanisms that must be deployed in order to meet the strict requirements for dependability imposed on the services provided by modern wireless networks. In this paper, we develop an executable top-down hierarchical Colored Petri Net (CPN) model for multi-traffic CAC in Orthogonal Frequency Division Multiple Access (OFDMA) system. By theoretic analysis and CPN simulation, it is demonstrated that the CPN model is isomorphic to Markov Chain (MC) assuming that each data stream follows Poisson distribution and the corresponding arrival time interval is an exponential random variable, and it breaks through MC's explicit limitation, which includes MC's memoryless property and proneness to state space explosion in evaluating CAC process. Moreover, we present four CAC schemes based on CPN model taking into account call-level and packet-level Quality of Service (QoS). The simulation results show that CPN offers significant advantages over MC in modeling CAC strategies and evaluating their performance with less computational complexity in addition to its flexibility and adaptability to different scenarios.展开更多
基于多载波信道容量最大化需求以及多业务混合传输的特性与质量要求,提出一种综合考虑保证媒体业务的QoS(quality of service)和最大化传输效率的BCMEP(best channel for most emergent packet)算法.该算法根据多载波系统各个子载波的...基于多载波信道容量最大化需求以及多业务混合传输的特性与质量要求,提出一种综合考虑保证媒体业务的QoS(quality of service)和最大化传输效率的BCMEP(best channel for most emergent packet)算法.该算法根据多载波系统各个子载波的信噪比水平和性能需求,结合链路层中业务包时延特性以及发送与接收窗口信息,对发送窗口中各个业务包按照BCMEP算法进行调度,从而达到兼顾媒体业务传输质量和最大化传输效率的目的.仿真结果表明,相比单纯注水算法和AMC(adaptive modulation and coding)算法,BCMEP算法在最大化系统吞吐量的同时,还能保障媒体业务QoS.展开更多
基金Supported by the National Natural Science Foundation of China (No. 61271421)the Education Department of Henan Province (No. 2011GGJS-002 and No. 12A510023)
文摘Call Admission Control (CAC) is one of the key traffic management mechanisms that must be deployed in order to meet the strict requirements for dependability imposed on the services provided by modern wireless networks. In this paper, we develop an executable top-down hierarchical Colored Petri Net (CPN) model for multi-traffic CAC in Orthogonal Frequency Division Multiple Access (OFDMA) system. By theoretic analysis and CPN simulation, it is demonstrated that the CPN model is isomorphic to Markov Chain (MC) assuming that each data stream follows Poisson distribution and the corresponding arrival time interval is an exponential random variable, and it breaks through MC's explicit limitation, which includes MC's memoryless property and proneness to state space explosion in evaluating CAC process. Moreover, we present four CAC schemes based on CPN model taking into account call-level and packet-level Quality of Service (QoS). The simulation results show that CPN offers significant advantages over MC in modeling CAC strategies and evaluating their performance with less computational complexity in addition to its flexibility and adaptability to different scenarios.
文摘基于多载波信道容量最大化需求以及多业务混合传输的特性与质量要求,提出一种综合考虑保证媒体业务的QoS(quality of service)和最大化传输效率的BCMEP(best channel for most emergent packet)算法.该算法根据多载波系统各个子载波的信噪比水平和性能需求,结合链路层中业务包时延特性以及发送与接收窗口信息,对发送窗口中各个业务包按照BCMEP算法进行调度,从而达到兼顾媒体业务传输质量和最大化传输效率的目的.仿真结果表明,相比单纯注水算法和AMC(adaptive modulation and coding)算法,BCMEP算法在最大化系统吞吐量的同时,还能保障媒体业务QoS.
