本文選題：寬帶衛(wèi)星通信 + 多址接入�。� 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：寬帶衛(wèi)星網(wǎng)絡(luò)作為地面網(wǎng)絡(luò)的補(bǔ)充和延伸，是未來(lái)空天地一體化網(wǎng)絡(luò)系統(tǒng)的重要組成部分。然而衛(wèi)星通信的帶寬是有限的，如何在有限資源下提高信道利用率并滿足用戶業(yè)務(wù)服務(wù)質(zhì)量是多址接入與帶寬分配策略研究的關(guān)鍵問(wèn)題。目前一些傳統(tǒng)的多址接入與帶寬分配策略能夠?qū)B續(xù)數(shù)據(jù)流業(yè)務(wù)和語(yǔ)音業(yè)務(wù)實(shí)現(xiàn)較高信道利用率和較低端到端時(shí)延，但是針對(duì)具有較強(qiáng)突發(fā)性多媒體業(yè)務(wù)和多樣化業(yè)務(wù)需求，這些技術(shù)已不能勝任。 本文系統(tǒng)研究了已有多址接入與帶寬分配策略，在基于帶寬按需分配的寬帶衛(wèi)星網(wǎng)絡(luò)下提出了一種改進(jìn)的信道接入?yún)f(xié)議CFDAMA-FP，，并同時(shí)改進(jìn)了其中的帶寬分配算法，旨在提高信道利用率和業(yè)務(wù)服務(wù)質(zhì)量，適應(yīng)業(yè)務(wù)突發(fā)特性。本文主要工作有： （1）基于混合按需/自由分配的多址接入?yún)f(xié)議CFDAMA采用自由分配時(shí)隙有效降低了平均傳輸時(shí)延，但隨著信道負(fù)載增大，自由分配時(shí)隙減少而預(yù)約次數(shù)增多造成網(wǎng)絡(luò)性能下降。針對(duì)這個(gè)問(wèn)題，提出具有快速反應(yīng)機(jī)制的多址接入?yún)f(xié)議。該協(xié)議改進(jìn)隨機(jī)接入算法，降低了接入碰撞概率；然后，繼承基于突發(fā)目標(biāo)的接入思想，采用在得到資源分配后周期發(fā)送帶寬需求更新信息的方式，代替反復(fù)申請(qǐng)資源的預(yù)約方式，能有效降低平均接入時(shí)延；最后，本文建立了接入端到端時(shí)延計(jì)算模型，證明了該協(xié)議能夠減少接入時(shí)延和平均傳輸時(shí)延； （2）在帶寬按需分配策略中，帶寬申請(qǐng)到分配的時(shí)延過(guò)長(zhǎng)造成資源浪費(fèi)，傳統(tǒng)分配方式采用預(yù)測(cè)業(yè)務(wù)策略來(lái)合理利用這段時(shí)延，但是由于業(yè)務(wù)高突發(fā)性，預(yù)測(cè)值和實(shí)際業(yè)務(wù)很難達(dá)到一致，本文提出基于預(yù)約的帶寬請(qǐng)求分配算法。首先，采用基于最大Lyapunov指數(shù)的混沌時(shí)間序列信源預(yù)測(cè)算法，該算法對(duì)高突發(fā)性信源具有較好預(yù)測(cè)性；然后，利用實(shí)際分配結(jié)果反饋控制預(yù)約申請(qǐng)，優(yōu)化帶寬分配結(jié)果，有效維持了用戶隊(duì)列穩(wěn)定性，降低了業(yè)務(wù)時(shí)延抖動(dòng)；最后，為了滿足不同等級(jí)業(yè)務(wù)性能需要，將業(yè)務(wù)要求作為優(yōu)先級(jí)排序分配依據(jù)，提高了業(yè)務(wù)性能和用戶接入公平性； 最后，通過(guò)對(duì)CFDAMA-FP進(jìn)行建模實(shí)現(xiàn)和對(duì)比仿真，結(jié)果表明在具有高突發(fā)特性的Pareto ON-OFF信源模型下，CFDAMA-FP能夠在高突發(fā)信源和用戶數(shù)目較大的條件下提供比CFDAMA-PA和CFDAMA-PB更優(yōu)的平均端到端時(shí)延/吞吐量性能和更好的用戶接入公平性能。
[Abstract]:As a supplement and extension of terrestrial network, broadband satellite network is an important part of future integrated space and earth network system. However, the bandwidth of satellite communication is limited. How to improve the channel utilization and satisfy the quality of service (QoS) is the key problem in the research of multiple access and bandwidth allocation strategy. At present, some traditional multiple access and bandwidth allocation strategies can achieve higher channel utilization and lower end-to-end delay for continuous data flow services and voice services, but for the demand of strong burst multimedia services and diversified services, some traditional multiple access and bandwidth allocation strategies can achieve higher channel utilization and lower end-to-end delay for continuous data flow services and voice services. These techniques are no longer up to the mark. In this paper, the existing multiple access and bandwidth allocation strategies are systematically studied. An improved channel access protocol, CFDAMA-FPFP, is proposed for broadband satellite networks based on bandwidth allocation on demand, and the bandwidth allocation algorithm is also improved. The purpose of this paper is to improve channel utilization and quality of service (QoS) and adapt to service burst characteristics. The main work of this paper is as follows: 1) CFDAMA, a hybrid on-demand / free allocation multiple access protocol, effectively reduces the average transmission delay by free allocation of time slots. However, with the increase of channel load, the number of free allocated slots decreases and the number of reservations increases, which results in network performance degradation. To solve this problem, a fast response multiple access protocol is proposed. The protocol improves the random access algorithm and reduces the access collision probability. Then, it inherits the access idea based on the burst target and transmits the bandwidth requirement update information in the period after the resource allocation. Instead of the reservation mode of repeatedly requesting resources, the average access delay can be reduced effectively. Finally, the end-to-end delay calculation model is established, which proves that the protocol can reduce the access delay and average transmission delay. 2) in the bandwidth allocation strategy, the delay of bandwidth allocation is too long, which results in waste of resources. The traditional allocation method uses the predictive service strategy to make use of the delay reasonably, but because of the high traffic burst, the traditional allocation method uses the predictive service strategy to make use of the delay reasonably. It is difficult to match the predicted value with the actual traffic. In this paper, a bandwidth request allocation algorithm based on reservation is proposed. First of all, chaotic time series source prediction algorithm based on maximum Lyapunov exponent is adopted, which has good predictability for high burst source, and then the bandwidth allocation result is optimized by feedback control of reservation application based on actual allocation result. It can effectively maintain the stability of the user queue and reduce the delay jitter. Finally, in order to meet the performance needs of different traffic levels, the traffic requirements are taken as the priority allocation basis, which improves the service performance and user access fairness. Finally, through modeling and simulation of CFDAMA-FP, The results show that CFDAMA-FP can provide better average end-to-end delay / throughput performance and better fair access performance than CFDAMA-PA and CFDAMA-PB in the case of high burst source and large number of users under the Pareto ON-OFF source model with high burst characteristics.
【學(xué)位授予單位】：重慶大學(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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