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无线多媒体传感器网络QoS路由优化算法研究
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摘要
无线多媒体传感器网络是由很多具有无线通信能力的节点组成的自组织、多跳网络,网络中的节点具有采集多媒体信息的功能,比如可以采集图像、视频、音频等多媒体信息。而多媒体信息在无线多媒体传感器网络传输一般都需要网络提供一定服务质量(QoS)保证,其中多媒体信息流的路由选择问题是无线多媒体传感器网络服务质量的一个关键问题,它担负着将流媒体数据在一定的约束条件下正确地从源节点传送到目的节点的任务。
     目前对于无线多媒体传感器的路由技术主要有两方面的研究,一方面是研究源节点和目的节点之间的路由发现机制,另一方面是研究流媒体和路由之间的优化传输问题。本文结合无线多媒体传感器网络的实际应用,对无线多媒体传感器网络QoS路由的优化问题进行了探讨。本文的主要工作包括:
     1.多路径路由是使无线多媒体传感器网络具有QoS保证的有效方法,在分布式的无线多媒体传感器网络中,节点之间如何协作而且能够快速地发现从源节点到目标节点之间的多条路径是目前的一个研究热点问题。本文根据路径质量、节点能量以及节点度等参数对路径性能的不同影响,定义了节点收益模型,然后,基于此模型,提出了针对单源节点和单目标节点的无线多媒体传感器网络的多路径QoS路由算法。
     2.结合视频流分级编码的特殊QoS要求以及无线多媒体传感器网络中多路径的特点,提出了一种基于非合作博弈论的多路径分配优化算法。文章首先根据多路径传输视频流的特点提出了一种应用于无线多媒体传感器网络的多路径分配博弈模型,然后证明了该模型存在纳什均衡。在此基础上,提出了一种基于纳什均衡的无线多媒体传感器网络多路径分配优化算法。
     3.由于单sink网络中存在着难以解决的sink节点失效问题,因此,多sink节点无线多媒体传感器网络应运而生。如何建立源节点和多sink节点之间的优化路由对无线多媒体传感器网络具有十分重要的意义。本文将无线多媒体传感器网络抽象成由多个sink节点激发的颜色引力场组成的合力场,数据传输至sink节点的过程抽象为某种颜色sink节点对相同颜色数据的吸引力作用,文章首先依据场理论对无线多媒体传感器网络的颜色场强、颜色场电势、颜色场梯度等物理量进行建模。然后,基于此模型提出了一种针对单sink节点和多sink节点无线多媒体传感器网络的多路径QoS路由优化算法。
     4.在多源节点和多目标节点的无线多媒体传感器网络中,源节点和目标节点之间的路由十分复杂。高效而公平的无线多媒体传感器网络能够使每个源节点都至少和一个目标节点建立数据传输通道。本文将多源节点和多目标节点的路由分配优化问题用图论中的匹配方法进行建模,提出了多源节点和多目标节点最小权匹配算法。仿真表明算法可以在兼顾网络的公平性的同时,又能够降低网络的能量消耗,最终延长了网络的生命期。
     全文的工作围绕无线多媒体传感器网络QoS路由优化问题展开,针对具有不同数量源节点和目标节点的无线多媒体传感器网络提出了具有针对性的QoS路由优化算法,并通过仿真实验的方法验证了算法的有效性。
Wireless multimedia sensor networks are wireless self-organizing and multi-hopnetwork systems which collects the multimedia information such as image, video andaudio via sensor nodes. As the wireless multimedia sensor networks deliver real-timeimages, audio, video and other multimedia information, the transmission ofmultimedia information need to be guaranteed with a certain quality of service (QoS).The critical issue of the QoS guarantee is the selecting of streaming routing, whichholds the task to correctly transmit the stream media data from the source node todestination node under certain constraints.
     Currently, route optimization technology has two main aspects of research: one isthe study on the discovery mechanism of routes between source node and destinationnode, the other is the optimization transmission of the streaming media and routinginformation.
     In this paper, we study the optimization QoS routing problem for wirelessmultimedia sensor networks according to the practical application of wirelessmultimedia sensor networks. The main contributions of this thesis are follows:
     1. Multi-path routing is an effective method to guarantee QoS in wirelessmultimedia sensor networks. In distributed wireless multimedia sensor networks, toensure nodes collaborate and find multiple paths quickly between the source node anddestination node is a hot research topic. According to the different effects of pathquality, the energy of nodes and the node degree towards the path performance, wedefine the node return model. Based on this model, a multi-path QoS routingalgorithm for single source node and single destination node wireless multimediasensor networks is proposed.
     2. Combined the special QoS requirements of video streaming scalable codingwith the characteristics of multi-path in wireless multimedia sensor network, thispaper proposes a multi-path allocation optimization algorithm based on thenon-cooperative game theory. Based on the characteristics of multi-path transmissionvideo stream, we bring forward a multi-path allocation game model for wirelessmultimedia sensor networks, and prove Nash equilibrium of the model. Finally, amulti-path allocation optimization algorithm is proposed.
     3. Because of the unsolvable problem on sink node failure in the single-sinknetwork, multi-sink node Wireless multimedia sensor network are proposed recently. However, it is of great significance to set up the optimization routing for wirelessmultimedia sensor networks with single source node and multiple sink nodes. Viaabstracting wireless multimedia sensor networks into the color gravitational fieldwhich is stimulated by more sink nodes and the process of data transmission to thesink node into the attractive role of some kind of color sink node to the data of thesame color, this paper set up a model based on field theory for wireless multimediasensor networks, the color field strength, color field potential, color field gradient andother physical quantity. On this basis, a multi-path QoS routing algorithm for singlesource node and multi-sink node wireless multimedia sensor networks are proposed.
     4. Considering the source node's data transmission efficiency and fairness inwireless multimedia sensor networks for multi-source node and destination node,every source node has at least one target node to match with. A minimum weightmatching algorithm between multi-source node and multi-destination node wasproposed by building a model using matching method in graph theory to solve themulti-source node and sink node routing allocation problem. The simulation resultsshow that the algorithm can guarantee the fairness of the network, reduce networkenergy consumption and prolong the network life cycle. The whole work of this paperstarted with the wireless multimedia sensor networks QoS routing optimizationproblem. Several QoS route optimization algorithm for different applications wasproposed. By taking simulation experiments, the effectiveness of the algorithm isverified.
引文
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