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首页> 外文期刊>International journal of mobile computing and multimedia communications >Quality of Service Analysis and Queuing Performance Modeling of Orthogonal Frequency Division Multiple Access Based IEEE 802.16/WiMAX System
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Quality of Service Analysis and Queuing Performance Modeling of Orthogonal Frequency Division Multiple Access Based IEEE 802.16/WiMAX System

机译：基于正交频分多址IEEE 802.16 / WiMAX系统的服务质量分析和排队性能建模

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摘要

The authors present a problem of queuing theoretic performance modeling and analysis oj Orthogonal Frequency Division Multiple Access (OFDMA) under broadband wireless networks. They consider a single-cell WiMAX environment in which the base station allocates sub channels to the subscriber stations in its coverage area. The sub channels allocated to a subscriber station are shared by multiple connections at that subscriber station. To ensure the Quality of Service (QoS) performances, a Connection Admission Control (CAC) mechanism is considered at a subscriber station. A queuing analytical framework for these admission control mechanisms is presented considering OFDMA-based transmission at the physical layer and based on the queuing model; both the connection-level and packet-level performances are studied and compared with their analogues in the case without CAC. The connection arrival is modeled by a Poisson process and the packet arrival for a connection by a Markov Modulated Poisson Process (MMPP). Several performance measures, namely connection blocking probability, average number of ongoing connections, average queue length, packet droppingprobability, queue throughput and average packet delay, are then derived and quantified.
机译：作者提出了在宽带无线网络下对正交频分多址（OFDMA）进行理论性能建模和分析排队的问题。他们考虑了单小区WiMAX环境，在该环境中，基站将子信道分配给其覆盖区域中的用户站。分配给用户站的子信道由该用户站上的多个连接共享。为了确保服务质量（QoS）的性能，在用户站上考虑了连接许可控制（CAC）机制。针对这些准入控制机制，提出了一种排队分析框架，该框架考虑了在物理层基于OFDMA的传输并基于排队模型。在没有CAC的情况下，研究了连接级和数据包级的性能，并将其与类似物进行了比较。通过泊松过程对连接到达进行建模，并通过马尔可夫调制泊松过程（MMPP）对连接的分组到达进行建模。然后，导出并量化了几种性能度量，即连接阻塞概率，正在进行的连接的平均数量，平均队列长度，数据包丢弃概率，队列吞吐量和平均数据包延迟。

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