【摘要】：伴隨著新一輪信息革命掀起的科技高潮,無線自組織網(wǎng)絡(luò)作為一種新型無線網(wǎng)絡(luò)通信技術(shù)自此得到了快速的發(fā)展,在軍事、醫(yī)療、工業(yè)等各個(gè)領(lǐng)域都有著廣泛的應(yīng)用前景。由于無線自組織網(wǎng)絡(luò)僅僅是近十年興起的無線網(wǎng)絡(luò)技術(shù),它存在一些較為明顯的不足之處,尤其是在傳統(tǒng)單路徑傳輸條件下,更容易出現(xiàn)網(wǎng)路故障,如網(wǎng)絡(luò)吞吐量較低、傳輸時(shí)延較大、網(wǎng)絡(luò)資源利用率低下、一旦鏈路出現(xiàn)故障就需要重新建立路由等問題。本文研究的NTN (Node-to-Node)橫聯(lián)遠(yuǎn)距離無線移動(dòng)自組織網(wǎng)絡(luò)是一種動(dòng)態(tài)拓?fù)涞膶?duì)等網(wǎng)絡(luò),其終端設(shè)備能在遠(yuǎn)距離下進(jìn)行無線通信,它是一組帶有無線收發(fā)裝置的移動(dòng)節(jié)點(diǎn)組成的一個(gè)多跳的臨時(shí)性的自治系統(tǒng)。在該網(wǎng)絡(luò)拓?fù)渲?兩個(gè)不能直接通信的移動(dòng)節(jié)點(diǎn)可以借助其它節(jié)點(diǎn)進(jìn)行分組轉(zhuǎn)發(fā),以實(shí)現(xiàn)多信道多頻點(diǎn)的數(shù)據(jù)通信。與其它移動(dòng)通信網(wǎng)絡(luò)相比,它不需要固定基站支持,具有網(wǎng)絡(luò)易部署、廣覆蓋、自組性、多跳、分布式的無線信道等特點(diǎn),主要用于協(xié)同移動(dòng)通信、無線接入系統(tǒng)、應(yīng)急通信。與無線自組織網(wǎng)絡(luò)一樣,NTN網(wǎng)絡(luò)的節(jié)點(diǎn)之間是通過多跳數(shù)據(jù)轉(zhuǎn)發(fā)機(jī)制進(jìn)行數(shù)據(jù)交換,需要路由協(xié)議進(jìn)行轉(zhuǎn)發(fā)決策,且無線信道的不規(guī)則性變化,節(jié)點(diǎn)的移動(dòng)、加入、退出等也會(huì)引起網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)的動(dòng)態(tài)變化。NTN網(wǎng)絡(luò)轉(zhuǎn)發(fā)系統(tǒng)的作用就是在這種環(huán)境下,監(jiān)控網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)變化,交互路由信息,產(chǎn)生、維護(hù)和選擇路由,并根據(jù)選擇的路由轉(zhuǎn)發(fā)數(shù)據(jù),提供網(wǎng)絡(luò)的連通性。本文通過分析NTN網(wǎng)絡(luò)與傳統(tǒng)的無線網(wǎng)絡(luò),指出存在的優(yōu)勢(shì)及不足之處,并且在當(dāng)前無線自組網(wǎng)路由協(xié)議的理想要求上,比較路由協(xié)議的常規(guī)問題來分析轉(zhuǎn)發(fā)系統(tǒng)設(shè)計(jì)方案的特點(diǎn),并從六個(gè)方面研究轉(zhuǎn)發(fā)系統(tǒng)。結(jié)果表明,每個(gè)節(jié)點(diǎn)維護(hù)一張包含下一跳節(jié)點(diǎn)信息的路由表,能實(shí)現(xiàn)全網(wǎng)拓?fù)浜投䦟愚D(zhuǎn)發(fā)表的學(xué)習(xí)、最短路徑的計(jì)算、拓?fù)淙キh(huán)功能,同時(shí)實(shí)現(xiàn)業(yè)務(wù)報(bào)文在空口、LAN口、協(xié)議棧間的路由選擇及管理功能,支持有線無線鏈路相互切換(兩條鏈路同時(shí)存在時(shí),業(yè)務(wù)數(shù)據(jù)優(yōu)先走有線鏈路),最終NTN網(wǎng)絡(luò)節(jié)點(diǎn)能在橫聯(lián)、遠(yuǎn)距離、無線、移動(dòng)、自組織的條件下進(jìn)行組網(wǎng)寬帶通信。
[Abstract]:With the new wave of information revolution, wireless ad hoc network, as a new wireless network communication technology, has been rapidly developed since then, and has wide application prospects in military, medical, industrial and other fields. Since wireless ad hoc network is only a wireless network technology rising in recent ten years, it has some obvious shortcomings, especially in the traditional single-path transmission conditions, it is more prone to network failures, such as low network throughput. The transmission delay is large and the network resource utilization is low. Once the link fails, the routing needs to be re-established. The NTN (Node-to-Node) long distance wireless mobile ad hoc network studied in this paper is a kind of dynamic topology peer-to-peer network, and its terminal equipment can carry out wireless communication at a long distance. It is a multi-hop temporary autonomous system composed of mobile nodes with wireless transceiver. In this network topology, two mobile nodes which can not communicate directly can transmit packets with the help of other nodes to realize multi-channel and multi-frequency data communication. Compared with other mobile communication networks, it does not need fixed base station support, and has the characteristics of easy network deployment, wide coverage, self-organizing, multi-hop, distributed wireless channels, etc. It is mainly used for cooperative mobile communication, wireless access system and emergency communication. Like wireless ad hoc networks, the nodes of NTN network exchange data through multi-hop data forwarding mechanism, which requires routing protocol to make forwarding decisions, and the irregular change of wireless channel, the movement of nodes, and the addition of nodes. The function of NTN network forwarding system is to monitor the change of network topology, exchange routing information, generate, maintain and select routing in this environment. The network connectivity is provided according to the selected routing and forwarding data. By analyzing the NTN network and the traditional wireless network, this paper points out the advantages and disadvantages, and the ideal requirements of the current Ad Hoc routing protocol. This paper compares the general problems of routing protocols to analyze the characteristics of the design scheme of forwarding system, and studies the forwarding system from six aspects. The results show that each node maintains a routing table containing the next hop node information, which can realize the learning of the whole network topology and layer 2 forwarding table, the calculation of the shortest path, the function of topology de-loop, and the realization of the service message in the empty port and the LAN port. Protocol stack routing and management functions, support wired wireless links to switch (when two links exist at the same time, the service data priority to the wired link), the ultimate NTN network nodes in horizontal connection, long-distance, wireless, mobile, Self-organized broadband communication is carried out under the condition of self-organization.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.5
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本文編號(hào)：2411082