發(fā)布時(shí)間：2018-01-19 06:06

  本文關(guān)鍵詞： 多Agent流媒體 擁塞控制 TCP-Reno TCP-Vegas JADE　出處：《青島科技大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：Internet的迅猛發(fā)展和普及為流媒體業(yè)務(wù)發(fā)展提供了強(qiáng)大的市場(chǎng)動(dòng)力。流媒體技術(shù)廣泛用于多媒體新聞發(fā)布、網(wǎng)絡(luò)廣告、在線直播、電子商務(wù)、遠(yuǎn)程教育、實(shí)時(shí)視頻會(huì)議等互聯(lián)網(wǎng)信息服務(wù)的方方面面。它結(jié)束了傳統(tǒng)Internet只能顯示文字和圖片的時(shí)代,開創(chuàng)了集聲音、視頻、文字及圖像于一體的新紀(jì)元。 流媒體傳輸技術(shù)由于自身傳輸時(shí)延敏感性,半可靠性,傳輸速率的平穩(wěn)性等特點(diǎn),在實(shí)際使用中通常采用UDP/IP協(xié)議進(jìn)行傳輸。但UDP缺乏擁塞控制機(jī)制,擁塞發(fā)生時(shí)它不會(huì)降低數(shù)據(jù)發(fā)送速率,這樣會(huì)引發(fā)兩種情況:其一, UDP占用的資源將遠(yuǎn)高于TCP流等響應(yīng)流所占用的資源,造成了嚴(yán)重不公平性;其二,它將導(dǎo)致?lián)砣�情況的進(jìn)一步惡化,甚至引發(fā)擁塞崩潰,嚴(yán)重影響流媒體服務(wù)質(zhì)量。因此,必須對(duì)流媒體傳輸引入擁塞控制機(jī)制。傳統(tǒng)擁塞控制算法是通過丟棄數(shù)據(jù)包后,使發(fā)送端通過收到大于等于三個(gè)重復(fù)的ACK或者重傳計(jì)時(shí)器超時(shí)的方式隱式的判斷擁塞的發(fā)生。本文將利用Agent技術(shù)實(shí)現(xiàn)擁塞的檢測(cè)、控制和管理,并提出一種改進(jìn)的擁塞控制算法Vegas-A+。當(dāng)擁塞發(fā)生時(shí),檢測(cè)擁塞Agent將實(shí)時(shí)監(jiān)測(cè)網(wǎng)絡(luò)并報(bào)告擁塞的發(fā)生,并由控制擁塞Agent根據(jù)網(wǎng)絡(luò)擁塞情況選擇合適的擁塞控制算法來緩解或消除擁塞。利用Agent之間的協(xié)作,降低丟包率,提高網(wǎng)絡(luò)的利用率。 Agent是一個(gè)具有自適應(yīng)性和智能性的軟件實(shí)體,能代表用戶或者其它程序,以主動(dòng)服務(wù)的方式完成一項(xiàng)任務(wù)。它具備自主性、反應(yīng)性、社會(huì)性、主動(dòng)性和適應(yīng)性等。本文提出用檢測(cè)Agent來完成報(bào)告擁塞發(fā)生的功能;控制Agent來完成減輕或消除擁塞的功能;黃頁(yè)Agent來實(shí)現(xiàn)Agent服務(wù)公布、服務(wù)查詢和服務(wù)訂閱的功能。各個(gè)Agent之間相互協(xié)作形成一個(gè)多Agent系統(tǒng)為網(wǎng)絡(luò)提供服務(wù)。在對(duì)Agent功能的分析和設(shè)計(jì)基礎(chǔ)之上,利用JADE開發(fā)平臺(tái)開發(fā)多Agent系統(tǒng)使之實(shí)現(xiàn)擁塞控制功能。
[Abstract]:The rapid development and popularization of Internet provides a strong market momentum for the development of streaming media business. Streaming media technology is widely used in multimedia news release, online advertising, online broadcast, electronic commerce, distance education, real-time video conferencing and other aspects of Internet information services. It is over the traditional Internet can only display text and pictures of the era. A set of voice, video, text and image in the new era of development.
Streaming media transmission technology because of its transmission delay sensitive, half reliability, transmission rate stationarity characteristics, in the actual use of the UDP/IP protocol is usually used for transmission. But the lack of UDP congestion control mechanism, it does not reduce the data transmission rate of congestion occurs, it will lead to two kinds of situations: first, UDP occupation the resources will be much higher than the TCP stream flow response resources, causing serious unfairness; secondly, it will lead to further deterioration of the situation of congestion, and even lead to congestion collapse, seriously affecting the quality of streaming media service. Therefore, must introduce the congestion control mechanism for streaming media transmission. The traditional congestion control algorithm is by discarding packets after the sender received by greater than or equal to three repeat ACK retransmission timer timeout or congestion judgment way implicit occurred. This paper will use Agent technology to realize congestion The detection, control and management, and put forward an improved congestion control algorithm Vegas-A+. when congestion occurs, Agent will be real-time monitoring of network congestion detection and report the occurrence of congestion, and the congestion control of Agent network congestion according to appropriate congestion control algorithm to alleviate or eliminate congestion. The collaboration between Agent, reduce the packet loss rate and improve network utilization.
Agent is an adaptive and intelligent software entity can, on behalf of the user or other programs to accomplish a task by the way of initiative service. It has autonomy, reactivity, sociality, initiative and adaptability. This paper proposes the use of Agent to complete the inspection report the congestion control Agent function; to reduce or eliminate the congestion function; Agent pages to achieve Agent service publication, service query and service subscription function. Each Agent cooperate with each other to form a multi Agent system to provide services to the network. On the basis of the analysis and design of Agent function based on the development platform of JADE multi Agent system development to achieve congestion the control function.

【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TP393.06

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