【摘要】：地面因特網(wǎng)規(guī)模的空前繁榮推動(dòng)了下一代網(wǎng)絡(luò)(Next Generation Network)的迅猛發(fā)展，形成了集合陸、海、空、天的空天地一體化信息網(wǎng)絡(luò)。作為地面網(wǎng)絡(luò)的旁路網(wǎng)絡(luò)，寬帶衛(wèi)星互聯(lián)網(wǎng)緩解地面互聯(lián)網(wǎng)的壓力的同時(shí)，又面臨著一系列亟待解決的困難。如寬帶衛(wèi)星互聯(lián)網(wǎng)以TCP/IP為承載方式和信息傳輸平臺(tái)，使得對(duì)其原本適用于地面的網(wǎng)絡(luò)協(xié)議的實(shí)用性有了新的要求；而地面-衛(wèi)星的混合網(wǎng)絡(luò)本身的復(fù)雜性以及對(duì)互融網(wǎng)絡(luò)資源的分配也有較大的難度等問(wèn)題使得對(duì)衛(wèi)星互聯(lián)網(wǎng)服務(wù)質(zhì)量(QoS，Quality of Service)保障的討論成為一項(xiàng)必要且重要的研究課題。 著眼于寬帶衛(wèi)星互聯(lián)網(wǎng)QoS的要求，本論文從衛(wèi)星節(jié)點(diǎn)接收和轉(zhuǎn)發(fā)分組數(shù)據(jù)的角度，分別論證星間骨干網(wǎng)中自相似業(yè)務(wù)量通過(guò)一次跳變?cè)谀康男l(wèi)星節(jié)點(diǎn)處匯聚的流量的自相似特性，以及衛(wèi)星作為傳輸數(shù)據(jù)的中間節(jié)點(diǎn)轉(zhuǎn)發(fā)數(shù)據(jù)的自相似特性。另外，還探討了地面-衛(wèi)星混合網(wǎng)絡(luò)中從地面信關(guān)站轉(zhuǎn)發(fā)到衛(wèi)星鏈路上的流量數(shù)據(jù)的自相似性；并通過(guò)建立ON/OFF源的自相似業(yè)務(wù)流量模型以及Pareto/M/1/C的排隊(duì)模型來(lái)實(shí)驗(yàn)證明衛(wèi)星通信系統(tǒng)中傳輸?shù)臄?shù)據(jù)具有自相似性。最后，論證了衛(wèi)星網(wǎng)絡(luò)中業(yè)務(wù)的自相似程度的增加能導(dǎo)致更高的系統(tǒng)丟包率和系統(tǒng)所需帶寬，從而使通信系統(tǒng)的性能惡化，降低QoS。 由于衛(wèi)星通信系統(tǒng)上的流量不可獲取，因此通過(guò)對(duì)衛(wèi)星通信系統(tǒng)中數(shù)據(jù)傳輸模型的分析，采用適當(dāng)?shù)牡孛婢W(wǎng)絡(luò)自相似流量作為參考來(lái)建立基于小波的ARIMA預(yù)測(cè)模型。在理論指導(dǎo)下通過(guò)Matlab仿真實(shí)驗(yàn)，選取基礎(chǔ)小波sym小波對(duì)非平穩(wěn)、周期變換且具有長(zhǎng)相關(guān)性的網(wǎng)絡(luò)流進(jìn)行三層小波分解，從而使自相似網(wǎng)絡(luò)流量平穩(wěn)化且使其自相似程度得以降低。針對(duì)本論文提出的預(yù)測(cè)模型，選取預(yù)測(cè)樣本數(shù)目為100，預(yù)測(cè)步長(zhǎng)為5，預(yù)測(cè)樣本數(shù)與預(yù)測(cè)數(shù)的比為20:1的預(yù)測(cè)模型對(duì)小波分解后的數(shù)據(jù)進(jìn)行預(yù)測(cè)能夠達(dá)到最好的預(yù)測(cè)效果，其預(yù)測(cè)均方根誤差為0.1773。 本系統(tǒng)的預(yù)測(cè)結(jié)果用于提供衛(wèi)星星上調(diào)度的隊(duì)列信息、為衛(wèi)星互聯(lián)網(wǎng)的跨層調(diào)度以及帶寬分配等提供可靠的參照數(shù)據(jù)，從而為實(shí)現(xiàn)網(wǎng)絡(luò)擁塞的緩解、優(yōu)化資源分配奠定了基礎(chǔ)，進(jìn)而改善衛(wèi)星網(wǎng)絡(luò)性能，，提高衛(wèi)星網(wǎng)絡(luò)傳輸?shù)姆⻊?wù)質(zhì)量。
[Abstract]:The unprecedented prosperity of the terrestrial Internet promotes the rapid development of the next generation network (Next Generation Network), and forms an integrated information network of land, sea, air and sky. As a bypass network of terrestrial network, broadband satellite Internet is facing a series of difficulties to be solved while relieving the pressure of terrestrial Internet. For example, the broadband satellite Internet takes TCP/IP as the bearing mode and the information transmission platform, which makes the practicability of the network protocol which originally applied to the ground has new requirements. However, the complexity of the ground-satellite hybrid network and the difficulty of resource allocation in the intermingled network make it possible to improve the quality of service (QoS,) of the satellite Internet. The discussion of Quality of Service) guarantee has become a necessary and important research topic. Focusing on the requirements of broadband satellite Internet QoS, this paper from the point of view of receiving and forwarding packet data from satellite nodes, The self-similar characteristics of self-similar traffic converging at the destination satellite node by a single jump and the self-similar characteristics of the satellite transmitting data as the intermediate node of the transmission data are discussed respectively in the inter-satellite backbone network. In addition, the self-similarity of traffic data transmitted from ground to satellite link in ground-satellite hybrid network is discussed. The self-similar traffic model of ON/OFF source and the queuing model of Pareto/M/1/C are established to prove that the data transmitted in satellite communication system has self-similarity. Finally, it is demonstrated that the increase of service self-similarity in satellite network can lead to higher packet loss rate and bandwidth required by the system, thus worsening the performance of the communication system and reducing the QoS.. Because the traffic on the satellite communication system is not available, the ARIMA prediction model based on wavelet is established by analyzing the data transmission model in the satellite communication system and using the proper self-similar traffic of the ground network as the reference. Under the guidance of theory, through Matlab simulation experiment, the basic wavelet sym wavelet is selected to decompose the non-stationary, periodic and long-correlation network flow with three-layer wavelet decomposition. Thus the self-similar network traffic is stabilized and its self-similarity degree is reduced. According to the prediction model proposed in this paper, the prediction model with the number of prediction samples is 100, the prediction step is 5, and the ratio of prediction sample number to prediction number is 20:1, the best prediction effect can be achieved by the prediction model after wavelet decomposition. The root mean square error of prediction is 0.1773. The prediction results of this system are used to provide the queue information of satellite on-board scheduling, and to provide reliable reference data for the cross-layer scheduling and bandwidth allocation of satellite Internet, thus laying a foundation for the alleviation of network congestion and the optimization of resource allocation. Furthermore, the performance of satellite network is improved and the service quality of satellite network transmission is improved.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN927.2

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