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首页> 外文期刊>IEEE Transactions on Parallel and Distributed Systems >Differentiation, QoS guarantee, and optimization for real-time traffic over one-hop ad hoc networks
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Differentiation, QoS guarantee, and optimization for real-time traffic over one-hop ad hoc networks

机译：一站式Ad hoc网络上的实时流量的区分，QoS保证和优化

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摘要

Nodes having a self-centrically broadcasting nature of communication form a wireless ad hoc network. Many issues are involved to provide quality of service (QoS) for ad hoc networks, including routing, medium access, resource reservation, mobility management, etc. Previous work mostly focuses on QoS routing with an assumption that the medium access control (MAC) layer can support QoS very well. However, contention-based MAC protocols are adopted in most ad hoc networks since there is no centralized control. QoS support in contention-based MAC layer is a very challenging issue. Carefully designed distributed medium access techniques must be used as foundations for most ad hoc networks. In this paper, we study and enhance distributed medium access techniques for real-time transmissions in the IEEE 802.11 single-hop ad hoc wireless networks. In the IEEE 802.11 MAC, error control adopts positive acknowledgement and retransmission to improve transmission reliability in the wireless medium (WM). However, for real-time multimedia traffic with sensitive delay requirements, retransmitted frames may be too late to be useful due to the fact that the delay of competing the WM is unpredictable. In this paper, we address several MAC issues and QoS issues for delay-sensitive real-time traffic. First, a priority scheme is proposed to differentiate the delay sensitive real-time traffic from the best-effort traffic. In the proposed priority scheme, retransmission is not used for the real-time traffic, and a smaller backoff window size is adopted. Second, we propose several schemes to guarantee QoS requirements. The first scheme is to guarantee frame-dropping probability for the real-time traffic. The second scheme is to guarantee throughput and delay. The last scheme is to guarantee throughput, delay, and frame-dropping probability simultaneously. Finally, we propose adaptive window backoff schemes to optimize throughput with and without QoS constraints.
机译：具有自中心广播的通信性质的节点形成无线自组织网络。为自组织网络提供服务质量（QoS）涉及许多问题，包括路由，介质访问，资源预留，移动性管理等。以前的工作主要集中在QoS路由上，并假设介质访问控制（MAC）层可以很好地支持QoS。但是，由于没有集中控制，因此在大多数自组织网络中都采用了基于竞争的MAC协议。基于竞争的MAC层中的QoS支持是一个非常具有挑战性的问题。精心设计的分布式媒体访问技术必须用作大多数自组织网络的基础。在本文中，我们研究和增强了用于IEEE 802.11单跳自组织无线网络中实时传输的分布式媒体访问技术。在IEEE 802.11 MAC中，错误控制采用肯定确认和重传，以提高无线介质（WM）中的传输可靠性。但是，对于具有敏感延迟要求的实时多媒体流量，由于竞争WM的延迟是不可预测的，因此重传的帧可能为时已晚，无法使用。在本文中，我们针对延迟敏感的实时流量解决了几个MAC问题和QoS问题。首先，提出了一种优先方案，以区分延迟敏感的实时流量和尽力而为流量。在提出的优先级方案中，重传不用于实时流量，而是采用较小的退避窗口大小。其次，我们提出了几种方案来保证QoS要求。第一种方案是保证实时流量的丢帧概率。第二种方案是保证吞吐量和延迟。最后一种方案是同时保证吞吐量，延迟和丢帧概率。最后，我们提出了自适应窗口退避方案来优化有和没有QoS约束的吞吐量。

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