WSN基于网络编码的无线传感器网络Qos传输机制研究
可以利用网络编码技术打破传统路由中节点只负责接受丶转发信息的模式，让节点在转发信息前对信息进行编码，以编码的信息来转发，接收端再解码接收到的信息，类似于电报的模式。网络编码能够显著提高网络吞吐量，使网络负载均衡，减少网络延时，降低能耗，提高网络容错性与鲁棒性，保证信息的安全。网络编码技术十分适合WSN的特点。
本文研究无线网络编码的随机线性网络编码。主要是其中的容错机制。接收端能够利用合适的编码有限域空间，恢复出产生丢失的原始数据，提高了数据传输的可靠性。本文利用一种基于网络编码的多径路由协议，采用逐跳方式建立多路径，采用最短路径优先选择下一跳节点，最后利用网络编码的容错性优势在源节点和中间节点编码，在汇聚节点解码从而得到数据。
通过仿真实验得证，网络编码的传感器网络减少了传输冗余数据，容错性和可靠性很高，同时也能降低节点能耗。
关键词 WSN 传输质量 多径路由协议 网络编码技术
毕业论文设计说明书外文摘要
Title MMSPEED:Multipath Multi-SPEED Protocol for Qos Guarantee of
Reliability and Timeliness in Wireless Sensor Networks
Abstract
In this paper, we present a novel packet delivery mechanism called Multi-Path and Multi-SPEED Routing Protocol(MMSPEED) for probabilistic QoS guarantee in wireless sensor networks. The QoS provisioning is performed in two quality domains,
namely, timeliness and reliability. Multiple QoS levels are provided in the timeliness domain by guaranteeing multiple packet delivery speed options. In the reliability domain, various reliability requirements are supported by probabilistic multipath forwarding. These mechanisms for QoS provisioning are realized in a localized way without global network information by employing localized geographic packet forwarding augmented with dynamic compensation, which compensates for local decision inaccuracies as a packet travels towards its destination. This way, MMSPEED can guarantee end-to-end requirements in a localized way, which is desirable for scalability and adaptability to large scale dynamic sensor networks. Simulation results show that MMSPEED provides QoS differentiation in both reliability and timeliness domains and, as a result, significantly improves the effective capacity of a sensor network in terms of number of flows that meet both reliability and timeliness requirements up to 50 percent (12 flows versus 18 flows).
Keywords System design simulations sensor networks service differentiation Qos Real-time reliability localized routing protocol
目 次
1.引言1
1.1WSN概述.1
1.1.1WSN的体系结构.1
1.1.2WSN的协议.2
1.2WSN的特点.3
1.3无线传感器中的差错控制.4
2.网络编码的概念.7
2.1网络编码原理7
2.2网络编码的应用7
2.3随机线性网络编码9
3.应用网络编码和多径路由的传感器网络分析.12
3.1无网络编码多径路由网络模型.12
3.2基于网络编码的多径路由网络模型 13
4.仿真模拟. .14
5.结论 . 18
6.致谢 . 19
7.附录. 20
参考文献. .24
1 引言
由于科学技术的进步，我们的生活已经离不开计算机网络和电子信息技术。这之中，传感器技术，分布式信息处理科技，网络编码技术更先进的这一发展趋势。其中，WSN（WSN）的增长率十分明显。目前，WSN已经在社会上的各种领域里得到了运用。近期有调查指出，WSN还将会以更快的速度增长。无线传感器网是一种分布式网络，它的末梢可以与外界进行传感互动，同时无线网络的通信方式使得WSN的设置十分灵活，并且可以与网络进行有线或无线连接。