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1、A MAC Protocol to Support QoS for Multimedia Traffic Transmission over Ad Hoc NetworksMAC协议为多媒体业务传输支持QoS的Ad Hoc网络多 ABSTRACT 摘要 Multimedia communication over wireless networks has become the driving technology for many important applications, experiencing dramatic market growth and promising revoluti
2、onary experiences in personal communication, gaming, entertainment, military, security, environment monitoring, and more. 在无线网络上的多媒体通信已经成为许多重要的应用驱动技术，经历巨大的市场增长 ， 而个人通信，游戏，娱乐，军事，平安，环境监测前途的革命经验，等等。 The advances in wireless communications and growth of real-time applications have necessitated the devel
3、opment of wireless networks that can support high Quality of Service QoS. 在无线通信和增长的进展实时应用 ， 因此有必要对无线网络的开展 ， 能够支持高效劳质量QoS。 In this paper, we introduce a reservation based, asynchronous MAC protocol called Multi-rate Multi-hop MAC Protocol MMMP for multi-hop Ad hoc networks that provides QoS guarantee
4、s for multimedia traffic. MMMP achieves this by providing service differentiation for multi-rate real-time traffic both real time constant bit rate traffic and real time variable bit rate traffic and guaranteeing a bounded end-to-end delay for the same while still catering to the throughput requirem
5、ents of non real time traffic. 本文介绍了一种基于保存，MAC协议称为异步多速率多跳的MAC协议MMMP的多跳Ad hoc网络 ， 提供多媒体通信效劳质量的保证。MMMP实现多提供这种效劳的差异，率实时交通包括实时交通恒定比特率 ， 实时可变比特率流量，并保证有界端到端的延迟 ， 而同一目的仍然照顾到非实时交通吞吐量的要求。 In addition, it administers bandwidth preservation via a feature called Smart Drop and implements efficient bandwidth usa
6、ge through a mechanism called Release Bandwidth. 此外，它通过一个管理功能 ， 所谓带宽保存智能降，并实现高效的带宽利用率通过一个机制 ， 称为发布带宽。 Simulation results on the QualNet simulator indicate that MMMP outperforms IEEE 802.11 on all performance metrics and can efficiently handle a large range of traffic intensity. 在QualNet仿真模拟结果说明，MMMP
7、优于所有性能指标的IEEE 802.11和可有效地处理交通强度大范围。 It also outperforms other similar state of the art MAC protocols. 它也优于其他的艺术的MAC协议类似的状态。 Categories and Subject Descriptors 分类和主题描述 mmunication Networks: Network Architecture and Design wireless communications. 网络体系结构与设计-无线通信。 General Terms 一般条款 Algorithms, Perform
8、ance, Design. 算法，性能，设计。 Keywords 关键词 QoS, Ad hoc networks, multimedia traffic. 效劳质量，Ad hoc网络，多媒体通信。 1. INTRODUCTION 引言 In a multi-hop wireless Ad hoc network, the changing network topology, the severely power constrained environment and the intrinsically unreliable transmission medium poses several
9、problems that prohibit provisioning for a high QoS. 在一个多跳无线Ad hoc网络，网络拓扑结构的变化，严重制约权力的环境和内在的不可靠的传输介质构成禁止的高效劳质量保障的几个问题。 Moreover, the absence of a centralized coordinator rules out the use of IEEE 802.11 Point Coordination Function PCF mode of operation. 此外，一出使用的IEEE 802.11点协调功能PCF的运作模式 ， 集中协调员规那么的情况下
10、。 Existing asynchronous MAC layer support for multimedia traffic includes protocols like Enhanced Distributed Coordination Function EDCF 1, IEEE 802.11e, Black Burst 2 and Modified Multiple Access Collision Avoidance with Piggyback Reservation MMACA/PR 3. 现有的异步对多媒体通信的MAC层支持包括像增强型分布式协调功能增强型分布式协调协议1，I
11、EEE 802.11e标准，黑场2和改进的多址接入冲突防止与背驮式预约MMACA /公关3。 We rule out the use of synchronous schemes because the overhead required for time synchronization amongst the nodes renders these schemes quite impractical. 我们排除同步方案 ， 因为这是开销时间节点之间呈现相当不切实际的这些方案同步所需。 In this paper we propose a reservation based asynchron
12、ous MAC protocol, especially for multimedia traffic, over a multi hop Ad Hoc network. 本文提出了一种基于异步保存MAC协议，特别是对多媒体传输，多跳Ad Hoc网络。 Our protocol provides QoS for real time traffic flows and delivers bounded end-to-end delay for such traffic without starving the non real time datagram packets. 我们的协议提供了QoS
13、的实时流量 ， 并提供范围内的终端到年底这种交通不挨饿的非实时数据报数据包延迟。 Our protocol employs the RTS-CTS Request-To-Send Clear-To-Send mechanism to reserve transmission slots for only for the first packet of a real-time flow. 我们采用了即时战略协议，中旅请按单发送-明确对发送机制 ， 储藏传输插槽 ， 只为实时流首报文。 The RTS-CTS mechanism allows neighbouring nodes who hear
14、 these transmissions to update their “Reservation Table so that they refrain from transmitting when another transmission is ongoing. 垃圾转运站壳聚糖机制使邻近的节点 ， 谁听到这些传输 ， 更新他们的“预约表，以便他们不发送的传输时 ， 另一个正在进行。 In addition, we ensure flow priority and thus Service Differentiation by allowing the RTS packets of a re
15、al time flow with higher priority to attain the channel with higher probability than another competing lower priority real time flow. 此外，我们保证流量的优先次序因此差异化效劳，允许具有更高的优先级实时数据包流量的RTS到达更高的概率比其他渠道竞争的低优先级的实时流动。 We use a Distributed Priority Scheduling DPS 5 algorithm to achieve this. 我们使用一个分布式优先级调度存5算法实现这一目
16、标。 We also ensure bandwidth conservation by “dropping packets that are “meaningless to the network via our “Smart Drop feature. 我们还确保“下降的数据包 ， 是“毫无意义通过我们的“智能拖放功能来保护网络带宽。 We incorporate efficient bandwidth usage by “borrowing unused available bandwidth from an existing flow and “giving it to a new flow which is in need of bandwidth. 我们将“借未使用的可用带宽 ， 带宽使用效率从现有的流通和“给到一个新的流动 ， 在需要的带宽。 We refer
