發(fā)布時(shí)間：2018-12-16 12:57

【摘要】：低功耗有損網(wǎng)絡(luò)(Low-Power and Lossy Networks, LLN)中的路由器一般在處理能力、存儲(chǔ)器和能量(電池功率)上受到限制。它們之間的互連具有高丟失率、低數(shù)據(jù)速率和不穩(wěn)定的特點(diǎn)。信息傳播是低功耗有損網(wǎng)絡(luò)的重要內(nèi)容，而發(fā)布/訂閱系統(tǒng)是一種使分布式系統(tǒng)中的各參與者，能以發(fā)布/訂閱的方式進(jìn)行交互的中間件系統(tǒng)，符合分散控制、動(dòng)態(tài)性、自治性和松耦合等特點(diǎn)，可以為低功耗有損網(wǎng)絡(luò)提供良好的通信與交互平臺(tái)。論文研究面向低功耗有損網(wǎng)絡(luò)的發(fā)布訂閱技術(shù)。 本文選取一種典型低功耗有損網(wǎng)絡(luò)協(xié)議——6LoWPAN協(xié)議進(jìn)行了介紹，在此基礎(chǔ)上，對(duì)RPL（Routing Protocol for LLN）路由協(xié)議進(jìn)行了介紹，而后，以實(shí)例的方式介紹了RPL路由協(xié)議如何采用3種控制消息進(jìn)行拓?fù)浣Y(jié)構(gòu)、向上路由和向下路由的建立。同時(shí)，對(duì)發(fā)布訂閱系統(tǒng)的背景、主要特點(diǎn)和類型進(jìn)行了闡述，其中，以內(nèi)容為基礎(chǔ)的發(fā)布訂閱系統(tǒng)中的內(nèi)容其屬性值可表達(dá)的含義多，類型多等特性，以內(nèi)容為基礎(chǔ)發(fā)布訂閱系統(tǒng)會(huì)成為構(gòu)建異步、大規(guī)模、分布式應(yīng)用系統(tǒng)的最受歡迎基礎(chǔ)設(shè)施之一。本文把發(fā)布訂閱的方式加入到低功耗有損網(wǎng)絡(luò)中，并將二者進(jìn)行有效的融合，從而形成一種新的通信范型，結(jié)合的目的是解決低功耗有損網(wǎng)絡(luò)傳輸數(shù)據(jù)時(shí)的高丟失率、低的數(shù)據(jù)速率和不穩(wěn)定的問題。 最后，本文在NS3仿真平臺(tái)上，對(duì)面向低功耗有損網(wǎng)絡(luò)的發(fā)布訂閱系統(tǒng)進(jìn)行了建模與仿真。本文在不同鄰節(jié)點(diǎn)距離、不同的最大傳輸速率和數(shù)據(jù)傳輸功率的條件下對(duì)這種新的通信模型的數(shù)據(jù)傳輸距離、速度和重發(fā)次數(shù)三項(xiàng)性能指標(biāo)進(jìn)行了仿真。仿真結(jié)果表明面向LLN的發(fā)布訂閱系統(tǒng)得到了實(shí)現(xiàn)，明顯提高了LLN的數(shù)據(jù)傳輸性能。進(jìn)一步表明利用發(fā)布訂閱系統(tǒng)中節(jié)點(diǎn)具有的數(shù)據(jù)緩存、發(fā)布interest和接收data的功能，，有效地解決了低功耗有損網(wǎng)絡(luò)中鏈路容易受損影響數(shù)據(jù)傳輸?shù)膯栴}，降低了數(shù)據(jù)丟失率，提高了數(shù)據(jù)的傳輸速率和穩(wěn)定性。
[Abstract]:In low power lossy networks (Low-Power and Lossy Networks, LLN), routers are generally limited in processing power, memory and energy (battery power). The interconnection between them is characterized by high loss rate, low data rate and instability. Information dissemination is an important content of low-power lossy networks, and publish / subscribe system is a middleware system that enables all participants in distributed systems to interact with each other in a publish / subscribe manner, which is decentralized and dynamic. Autonomy and loose coupling can provide a good communication and interactive platform for low power lossy networks. This paper studies publish and subscribe technology for low power lossy networks. This paper introduces a typical low-power lossy network protocol, 6LoWPAN protocol, and then introduces the RPL (Routing Protocol for LLN) routing protocol. This paper introduces how RPL routing protocol adopts three kinds of control messages to construct topology, up route and down route. At the same time, the background, main characteristics and types of publish / subscribe system are expounded. Content-based publish-subscribe systems will become one of the most popular infrastructures for building asynchronous, large-scale, distributed applications. In this paper, the publish / subscribe mode is added to the low power lossy network, and the two are effectively combined to form a new communication paradigm. The purpose of the combination is to solve the high loss rate of data transmission in the low power lossy network. Low data rate and unstable problems. Finally, this paper models and simulates the publish / subscribe system for low power loss lossy network on NS3 simulation platform. In this paper, the data transmission distance, speed and retransmission times of this new communication model are simulated under the conditions of different neighbor node distance, different maximum transmission rate and data transmission power. The simulation results show that the publish / subscribe system for LLN is implemented and the data transmission performance of LLN is improved obviously. It is further shown that using the functions of data cache, publishing interest and receiving data of nodes in publish / subscribe system can effectively solve the problem that the link is vulnerable to damage in low-power lossy network and reduce the rate of data loss. The data transmission rate and stability are improved.
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.04

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