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A QoS Estimation-Based Scheduler for Real-Time Traffic in IEEE 802.11e Mobile Ad hoc Networks

机译:IEEE 802.11e移动自组织网络中基于QoS估计的实时流量调度器

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摘要

For mobile ad hoc networks, the IEEE 802.lie standard specifi cation provides Quality of Service (QoS) facility support in the MAC layer by Enhanced Distribution Channel Access (EDCA), which provides differentiated and distributed access to the wireless medium with four access categories (AC). It works efficiently for constant bit rate (CBR) types of traffic; however, for the case of variable bit rate (VBR) types of traffic, it shows poor performance due to the static nature of computing the number of packets and the time required to transmit these packets. In this paper, we present an EDCA scheduling algorithm that allocates transmission opportunities (TXOP) for fluctuating VBR traffic depending on their queue length estimations for mobile ad hoc networks. We classify the channel state as good or bad based on the channel error conditions. Then the scheduler determines the mean application data rate and estimates the TXOP for the next interval on the same Traffic Stream (TS). By simulation results, we show that the proposed scheduling scheme achieves good throughput and fairness with reduced delay for the VBR traffic class.
机译:对于移动自组织网络,IEEE 802.lie标准规范通过增强型分布信道访问(EDCA)在MAC层中提供服务质量(QoS)设施支持,该功能可通过四个访问类别为无线介质提供差异化​​和分布式访问(AC)。它可以有效地处理恒定比特率(CBR)类型的流量。但是,对于可变比特率(VBR)类型的业务,由于计算数据包数量和传输这些数据包所需的时间是静态的,因此它表现出较差的性能。在本文中,我们提出了一种EDCA调度算法,该算法根据移动ad hoc网络的队列长度估计,为波动的VBR流量分配传输机会(TXOP)。我们根据通道错误情况将通道状态分为好还是坏。然后,调度程序确定平均应用数据速率,并估计同一业务流(TS)上下一个间隔的TXOP。通过仿真结果,我们表明所提出的调度方案为VBR业务类别实现了良好的吞吐量和公平性,并减少了延迟。

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