本文選題：集中分布式 + SIP協(xié)議�。� 參考：《電子科技大學》2014年碩士論文

【摘要】：會議在人類政治、經(jīng)濟、文化及軍事活動起著舉足輕重的作用,隨著社會的發(fā)展,會議成為人與人之間越來越重要的信息交流方式,而電話會議以其經(jīng)濟、便捷、高效等優(yōu)點被廣泛的使用。在實際使用過程中,參加電話會議的成員往往具有局部集中廣域分布特點,本文將這種網(wǎng)絡簡稱為集中分布式網(wǎng)絡。常用的端用戶混合模式和集中混合模式有各自的缺點:端用戶混合模式對終端能力要求較高,網(wǎng)絡中語音數(shù)據(jù)冗余,帶寬使用效率低,容易引起局部網(wǎng)絡擁塞;集中混合模式對服務器性能要求較高,不能避免局部網(wǎng)絡擁塞,帶寬使用效率不高。這兩種模式不能適應集中分布式網(wǎng)絡的特點。另外,當前對參會人數(shù)要求也越來越多,端用戶混合模式和集中混合模式受到混音器性能的限制逐漸不能滿足要求。本文在深入研究了集中分布式網(wǎng)絡特點、SIP協(xié)議、H.248/megaco協(xié)議以及混合模型的基礎上,設計和實現(xiàn)了一種基于SIP的分級混合的電話會議系統(tǒng)。本文的主要研究內(nèi)容和所做的工作主要包含以下幾個方面:1)研究SIP協(xié)議標準,通過對SIP協(xié)議擴展,實現(xiàn)了分級電話會議創(chuàng)建、管理以及關(guān)閉功能的信令控制;2)研究實現(xiàn)了H.248/megaco協(xié)議在分級電話會議系統(tǒng)中的媒體控制機制,實現(xiàn)了分級電話會議系統(tǒng)媒體和信令分離,業(yè)務和媒體分離,使系統(tǒng)具有很強的靈活性和易擴展性;3)研究對比現(xiàn)有電話會議混合模型特點,提出并實現(xiàn)了適合分級電話會議系統(tǒng)的分級混合模型,分擔了混和器處理負荷,避免傳輸重復的媒體數(shù)據(jù),提高了帶寬使用效率;4)對分級電話會議系統(tǒng)進行了主要的功能、性能測試,對項目所完成的結(jié)果進行了評估,驗證了系統(tǒng)的有效性和優(yōu)越性。
[Abstract]:The conference plays an important role in the political, economic, cultural and military activities of human beings. With the development of the society, the conference has become an increasingly important means of information exchange between people, and the teleconference is economical and convenient. The advantages of high efficiency are widely used. In the process of practical use, the members participating in teleconference often have the characteristic of local centralized wide area distribution. In this paper, this kind of network is referred to as centralized distributed network. The common end-user mixed mode and centralized mixed mode have their own disadvantages: the end-user mixed mode requires high terminal capability, the voice data in the network is redundant, the bandwidth is low, and the local network congestion is easy to be caused; The centralized hybrid mode requires high server performance, can not avoid the local network congestion, bandwidth use efficiency is not high. These two models can not adapt to the characteristics of centralized distributed networks. In addition, there are more and more demands on the number of attendees, and the performance of mixers can not meet the requirements of end-user mixing mode and centralized mixing mode. Based on the in-depth study of the SIP protocol H.248 / megaco protocol and the hybrid model, a hierarchical hybrid teleconferencing system based on SIP is designed and implemented in this paper. The main research content and work of this paper mainly include the following several aspects: 1) study the standard of SIP protocol. By extending the SIP protocol, we realize the establishment of hierarchical teleconference. The media control mechanism of H.248/megaco protocol in hierarchical teleconferencing system is studied and realized. The separation of media and signaling, service and media separation are realized in hierarchical teleconference system. So that the system has strong flexibility and extensibility. (3) comparing the characteristics of the existing teleconference hybrid model, a hierarchical hybrid model suitable for the hierarchical teleconference system is proposed and implemented, which shares the processing load of the mixer. Avoiding the transmission of duplicate media data and improving the bandwidth efficiency. The main functions and performance tests of the hierarchical teleconferencing system are carried out. The results of the project are evaluated and the effectiveness and superiority of the system are verified.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN916.6

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本文編號：1888595