本文關(guān)鍵詞：衛(wèi)星網(wǎng)絡(luò)的擁塞控制策略研究　出處：《北京郵電大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 衛(wèi)星通信 擁塞控制 主動(dòng)隊(duì)列管理 鏈路誤碼率 隨機(jī)流模型 網(wǎng)絡(luò)優(yōu)化工程工具

【摘要】：隨著人們不斷增長(zhǎng)的多媒體通信需求和日益增大的帶寬需要,下一代全球信息網(wǎng)絡(luò)必將向新一代Internet,新一代移動(dòng)通信網(wǎng)以及下一代衛(wèi)星通信網(wǎng)的異構(gòu)結(jié)合的方向發(fā)展,而衛(wèi)星網(wǎng)絡(luò)也將在全球互聯(lián)網(wǎng)中扮演更加重要的角色。帶寬的發(fā)展對(duì)衛(wèi)星網(wǎng)絡(luò)的服務(wù)質(zhì)量(Quality of Service, QoS)提出了新的要求,保證信息在衛(wèi)星網(wǎng)絡(luò)中傳輸?shù)母咝浴⒎�(wěn)定性、可靠性成為重中之重。因此,進(jìn)行衛(wèi)星網(wǎng)絡(luò)擁塞控制研究具有十分重要的意義。 論文在研究擁塞控制原理的基礎(chǔ)上,主要從衛(wèi)星網(wǎng)絡(luò)的主要特點(diǎn)出發(fā),對(duì)衛(wèi)星網(wǎng)絡(luò)中的擁塞控制策略進(jìn)行了深入的研究,論文主要的研究工作為： (1)在研究傳統(tǒng)TCP擁塞控制算法在衛(wèi)星網(wǎng)絡(luò)上的不適用性和分析衛(wèi)星網(wǎng)絡(luò)中經(jīng)典TCP擁塞控制算法的優(yōu)劣的基礎(chǔ)上,提出了針對(duì)衛(wèi)星網(wǎng)絡(luò)的基于帶寬估計(jì)的窗口恢復(fù)改進(jìn)TCP擁塞控制算法TCP-BRE。算法通過(guò)可用帶寬估計(jì)提高了窗口增大速度,通過(guò)引入窗口加速因子加快丟包后的窗口恢復(fù)速度,同時(shí)增加了丟包檢測(cè)機(jī)制來(lái)區(qū)分丟包原因,減小誤碼對(duì)TCP性能的影響,仿真研究了算法的吞吐量性能。研究結(jié)果表明,TCP-BRE在衛(wèi)星網(wǎng)絡(luò)傳輸條件下與Reno相比,能夠更快的傳輸小數(shù)據(jù)量短流,并有效提高了穩(wěn)態(tài)吞吐量,在誤碼條件下吞吐量仍能保持在很高的水平。TCP-BRE算法有效提高了衛(wèi)星網(wǎng)絡(luò)的資源利用效率。 (2)在分析經(jīng)典主動(dòng)隊(duì)列管理的算法并指出這些算法在衛(wèi)星網(wǎng)絡(luò)中的不適用性的基礎(chǔ)上,提出了一種基于鏈路誤碼率的自適應(yīng)隨機(jī)指數(shù)標(biāo)記算法EAREM。該算法在星載路由系統(tǒng)中,基于REM算法,結(jié)合衛(wèi)星鏈路誤碼率高的特點(diǎn),在價(jià)格中增加了誤碼率項(xiàng)并改進(jìn)了REM參數(shù)自適應(yīng)的方式。算法通過(guò)價(jià)格機(jī)制降低了誤碼率較高的輸入流的占用帶寬,從而降低了整個(gè)網(wǎng)絡(luò)因誤碼造成的丟包,仿真研究了算法的隊(duì)列長(zhǎng)度穩(wěn)定性和丟包率等性能。研究結(jié)果表明：EAREM在衛(wèi)星高誤碼率網(wǎng)絡(luò)中比AREM、REM算法有更低的丟包率,同時(shí)保證了隊(duì)列長(zhǎng)度的穩(wěn)定性,提高了響應(yīng)速度。EAREM算法還能夠根據(jù)不同輸入流所經(jīng)鏈路的誤碼率情況,完成帶寬的合理分配。在誤碼率突變情況下,算法也有較好的適應(yīng)性。 (3)在分析針對(duì)緩存門(mén)限優(yōu)化的隨機(jī)流模型(SFM)原理基礎(chǔ)上,提出了一種基于隨機(jī)實(shí)驗(yàn)法的SFM動(dòng)態(tài)緩存門(mén)限優(yōu)化算法。算法首先提出基于輸入反饋的星載路由器隨機(jī)流模型,在此模型上構(gòu)建平衡丟包、時(shí)延性能的代價(jià)函數(shù),并考慮星載路由處理能力采用隨機(jī)試驗(yàn)法來(lái)實(shí)現(xiàn)緩存門(mén)限值的動(dòng)態(tài)優(yōu)化。仿真研究了算法的緩存門(mén)限值收斂性能。研究結(jié)果表明所提的基于隨機(jī)試驗(yàn)法的SFM動(dòng)態(tài)緩存門(mén)限優(yōu)化算法收斂性能較好,在不同門(mén)限初值情況下能達(dá)到較快的收斂,且算法復(fù)雜度低,易于在星載路由器上部署。論文還深入探究了平衡系數(shù)、反饋因子、業(yè)務(wù)流速比例等關(guān)鍵參數(shù)對(duì)收斂曲線的影響。
[Abstract]:With the increasing demand for multimedia communication and increasing bandwidth, the next generation of global information network will become a new generation of Internet. The new generation mobile communication network and the next generation satellite communication network are developing in the direction of heterogeneous combination. Satellite network will also play a more important role in the global Internet. The development of bandwidth will improve the quality of service of satellite network. QoS) puts forward new requirements to ensure the high efficiency, stability and reliability of the transmission of information in satellite networks. Therefore, it is of great significance to study the congestion control of satellite networks. Based on the research of congestion control principle and the main characteristics of satellite network, this paper makes a deep research on the congestion control strategy in satellite network. The main research work of this paper is as follows: 1) on the basis of studying the inapplicability of traditional TCP congestion control algorithm in satellite network and analyzing the advantages and disadvantages of classical TCP congestion control algorithm in satellite network. An improved TCP congestion control algorithm, TCP-BRE, for satellite networks based on bandwidth estimation is proposed. The algorithm improves the speed of window growth through the estimation of available bandwidth. The window acceleration factor is introduced to accelerate the window recovery speed after packet loss and the packet loss detection mechanism is added to distinguish the cause of packet loss and to reduce the impact of error codes on TCP performance. The simulation results show that TCP-BRE can transmit small data short stream faster than Reno in satellite network. The steady-state throughput is improved effectively, and the throughput can be maintained at a high level. TCP-BRE algorithm can effectively improve the resource utilization efficiency of satellite networks. On the basis of analyzing the classical active queue management algorithms and pointing out the inapplicability of these algorithms in satellite networks. An adaptive random exponential marking algorithm based on link error rate (LBER) is proposed, which is based on REM algorithm and high BER in satellite link routing system. The BER item is added to the price and the adaptive mode of REM parameters is improved. The algorithm reduces the bandwidth of the input stream with high BER through the price mechanism. In order to reduce the packet loss caused by error code, the performance of queue length stability and packet loss rate of the algorithm is studied by simulation. The results show that the performance of AREM in the satellite high bit error rate network is better than that of the AREM. The REM algorithm has lower packet loss rate, at the same time ensures the stability of queue length, and improves the response speed. EAREM algorithm can also be based on different input streams through the link error rate. In the case of BER mutation, the algorithm also has good adaptability. 3) based on the analysis of the stochastic flow model (SFM) for buffer threshold optimization. This paper presents a dynamic buffer threshold optimization algorithm for SFM based on random experiment. Firstly, a random flow model of spaceborne router based on input feedback is proposed and balanced packet loss is constructed on the model. The cost function of delay performance. Considering the spaceborne routing processing ability, the random test method is used to realize the dynamic optimization of the buffer threshold. The convergence performance of the buffer threshold of the algorithm is studied by simulation. The results show that the proposed SFM based on the stochastic test method is based on the proposed algorithm. Dynamic buffer threshold optimization algorithm has good convergence performance. In the case of different threshold initial value can achieve faster convergence, and the algorithm complexity is low, easy to deploy on the spaceborne router. The paper also deeply explore the balance coefficient, feedback factor. The influence of the key parameters, such as the ratio of service velocity, on the convergence curve.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN927.2

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