【作者】 张健；

【导师】 谌云莉；

【作者基本信息】 北京工业大学 ， 软件工程（专业学位）， 2014， 硕士

【摘要】 随着各类无线通信技术的不断发展，可以灵活用于接入Internet的无线网络技术越来越多地受到重视，并出现在人们的生活中。目前占据市场主体的是一种从局域网发展而来的单跳无线接入技术。由于单跳传输技术自身存在如传输距离有限、倚仗中心节点等缺陷，为了更好地满足人们对大范围、高带宽无线接入的需要，无线Mesh网络也在不断地发展和完善。无线Mesh网络提供多跳的接入方式，不仅提高了无线网络的覆盖范围，还增加了部署的灵活性，从而降低了网络部署、维护的难度，并能提供相对较高的带宽。目前的无线Mesh网络还处于广泛的研究阶段，各种新技术、新需求被不断引入并不断完善。无线传输技术是为人们传输数据的需求而服务的。在信息量日益增大的网络中，人们对视频传输速度和传输质量都提出了更高的要求。传输视频要求高带宽、低延时等较严格的QoS，这对各类无线传输技术都提出了挑战。本文针对采用802.11e协议的无线Mesh网络进行传输视频这一特定业务场景，研究了多跳节点间的拥塞控制机制、无线Mesh网络边缘节点的拥塞控制以及视频传输跨层队列分配机制等问题，提出了带优先级区分的拥塞控制机制、依据中继节点缓存大小计算RRP数值以及一种更加适应网络变化的视频传输动态队列分配机制。最后，本文对以上所提出的改进机制进行了仿真实验。实验结果表明，通过本文提出的改进机制可以有效提高无线Mesh网络的多媒体信息传输能力。更多还原

【Abstract】 With the continuous development of various types of wireless communicationtechnologies, there is more and more attention to flexible wireless network technologyfor access to the Internet, which becomes part of people’s lives. Currently a local areanetwork evolved from single-hop wireless access technology occupies the mainmarket. Because of the single-hop transmission limitations, such as the short of thetransmission distance, relying on the central node, etc., wireless Mesh network hasbeen constantly developing and improving to better meet people’s needs forlarge-scale, high-bandwidth wireless access.Wireless Mesh Networks provide multi-hop access, which not only improves thecoverage of a wireless network, but also increases the flexibility of deployment,reduces network deployment and maintenance of hegemony, and improves therelatively high bandwidth. Wireless Mesh Network is currently still in the stage ofextensive research. New technologies are constantly introduced and continue to beimproved to meet the new requirements.Wireless technology aims to provide service for data transmission. With theincreasing amount of information in the network, the quality of service such as higherbandwidth and lower delay, becomes more and more important, which presentschallenges to wireless transmission technology. In this paper, we adopted the802.11eprotocol based Wireless Mesh Networks for transmission of video in these particularscenarios, studied congestion control mechanism for multi-hop nodes, congestioncontrol for edge nodes, and cross-layer queue allocation mechanism for videotransmission in wireless Mesh network and proposed mechanism to improve theperformance of IEEE802.11e protocol in WMN for video transmission. Finally, wehave done extensive simulations and the results show that our proposed mechanismscan effectively improve the performance of multimedia transmission in wireless meshnetwork.更多还原