靜止軌道衛(wèi)星系統(tǒng)媒體接入控制協(xié)議研究
發(fā)布時(shí)間：2018-10-04 19:18
【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)鍵問題。因此,對(duì)寬帶衛(wèi)星網(wǎng)絡(luò)接入控制方式的研究是寬帶衛(wèi)星網(wǎng)絡(luò)技術(shù)的重要研究課題。對(duì)于寬帶地球同步軌道(GEO)衛(wèi)星網(wǎng)絡(luò),較大的傳輸時(shí)延使得在保障衛(wèi)星信道利用率的同時(shí),減小業(yè)務(wù)的端-端時(shí)延成為寬帶GEO衛(wèi)星網(wǎng)絡(luò)接入控制方式研究的重點(diǎn)。本文系統(tǒng)性的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)的多址接入?yún)f(xié)議CFDAMA-RPA,并對(duì)該算法進(jìn)行了改進(jìn),旨在降低端到端時(shí)延,提高信道利用率。本文主要工作有:(1)在基于混合自由/按需分配的多址接入?yún)f(xié)議CFDAMA系列算法中,各個(gè)算法均有其不同的優(yōu)缺點(diǎn),其中采用輪詢預(yù)約方式的CFDAMA-RR算法能滿足較好的特性,但是輪詢預(yù)約周期相對(duì)過長(zhǎng)。而采用隨機(jī)預(yù)約方式的CFDAMA-RA算法在負(fù)載較高時(shí)由于碰撞加劇,造成端到端時(shí)延增大。采用捎帶預(yù)約方式的CFDAMA-PB算法在負(fù)載較高時(shí),信道資源被已經(jīng)接入信道的終端壟斷,使得有新的接入請(qǐng)求的終端無(wú)法及時(shí)接入信道預(yù)約資源,造成分組積壓,端到端時(shí)延急劇增大。本文將隨機(jī)、輪詢和捎帶三種預(yù)約方式進(jìn)行了結(jié)合,優(yōu)劣互補(bǔ),在低、中、高負(fù)載情況下均實(shí)現(xiàn)了較好的特性。(2)在將隨機(jī)、輪詢和捎帶三種預(yù)約方式進(jìn)行結(jié)合的過程中,針對(duì)有突發(fā)特性的ON-OFF業(yè)務(wù),為了使處于OFF期的業(yè)務(wù)終端能盡快接入信道進(jìn)行資源預(yù)約,本文所提算法中由衛(wèi)星對(duì)處于OFF期的業(yè)務(wù)終端安排隨機(jī)預(yù)約,并記錄了預(yù)約安排次序。由于隨機(jī)預(yù)約存在碰撞,在發(fā)生碰撞后需要進(jìn)行退避重發(fā),為了避免已經(jīng)發(fā)生碰撞的終端在退避重發(fā)過程中發(fā)生二次碰撞,衛(wèi)星對(duì)首次發(fā)生碰撞的地面終端安排進(jìn)行輪詢預(yù)約,使其能盡快接入信道進(jìn)行后續(xù)的預(yù)約。另外,在對(duì)處于OFF期的業(yè)務(wù)終端安排隨機(jī)預(yù)約的過程中,本文對(duì)安排方案進(jìn)行了優(yōu)化,將靜態(tài)分配方式改為動(dòng)態(tài)分配方式,從而降低了碰撞概率,提升了算法性能。最后,通過對(duì)CFDAMA-RPA算法進(jìn)行opnet計(jì)算機(jī)仿真手段建模實(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-RPA能夠?qū)崿F(xiàn)比CFDAMA-RA、CFDAMA-PB、CFDAMA-RR以及其它CFDAMA系列算法更優(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 user's quality of service is the key problem in the research of multiple access and bandwidth allocation strategy. Therefore, the research of broadband satellite network access control is an important research topic of broadband satellite network technology. For broadband geosynchronous orbit (GEO) satellite networks, the large transmission delay makes reducing the end-to-end delay of services while ensuring satellite channel utilization to be the focus of research on broadband GEO satellite network access control. In this paper, the existing multiple access and bandwidth allocation strategies are systematically studied, and an improved multiple access protocol (CFDAMA-RPA,) based on bandwidth on-demand allocation is proposed to reduce end-to-end delay. Improve channel utilization. The main work of this paper is as follows: (1) in the CFDAMA series of multiple access protocols based on hybrid free / on-demand allocation, each algorithm has its own advantages and disadvantages, among which the CFDAMA-RR algorithm based on polling reservation can meet the better characteristics. But the polling reservation cycle is relatively long. The random reservation CFDAMA-RA algorithm increases the end-to-end delay due to the increase of collision when the load is high. When the load of CFDAMA-PB algorithm with piggyback reservation is high, the channel resource is monopolized by the terminal that has already accessed the channel, which makes the terminal with new access request unable to access the channel reservation resource in time, resulting in the packet backlog. End-to-end delay increases dramatically. In this paper, we combine random, polling and piggyback reservation methods, the advantages and disadvantages complement each other, and achieve better characteristics under low, medium and high load. (2) in the process of combining random, polling and piggyback reservation methods, For ON-OFF services with burst characteristics, in order to enable the service terminals in the OFF period to access the channel as soon as possible to make resource reservation, the proposed algorithm arranges the random reservation for the service terminals in the OFF period, and records the reservation scheduling order. Because there is a collision in random reservation, it is necessary to carry out Backoff retransmission after the collision. In order to avoid the secondary collision of the terminal that has already collided in the process of avoiding the retransmission, the satellite makes an appointment to the ground terminal where the collision occurs for the first time. Enable it to access the channel as soon as possible for subsequent appointments. In addition, in the process of arranging the random reservation for the service terminal in the OFF period, this paper optimizes the arrangement scheme, changing the static assignment mode to the dynamic one, thus reducing the collision probability and improving the performance of the algorithm. Finally, the CFDAMA-RPA algorithm is modeled and compared by opnet computer simulation. The results show that CFDAMA-RPA can achieve better average end-to-end delay / throughput performance and better fair access performance than CFDAMA-RA,CFDAMA-PB,CFDAMA-RR and other CFDAMA algorithms under the Pareto ON-OFF source model with high burst characteristics.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN927.2
本文編號(hào)：2251557
[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 user's quality of service is the key problem in the research of multiple access and bandwidth allocation strategy. Therefore, the research of broadband satellite network access control is an important research topic of broadband satellite network technology. For broadband geosynchronous orbit (GEO) satellite networks, the large transmission delay makes reducing the end-to-end delay of services while ensuring satellite channel utilization to be the focus of research on broadband GEO satellite network access control. In this paper, the existing multiple access and bandwidth allocation strategies are systematically studied, and an improved multiple access protocol (CFDAMA-RPA,) based on bandwidth on-demand allocation is proposed to reduce end-to-end delay. Improve channel utilization. The main work of this paper is as follows: (1) in the CFDAMA series of multiple access protocols based on hybrid free / on-demand allocation, each algorithm has its own advantages and disadvantages, among which the CFDAMA-RR algorithm based on polling reservation can meet the better characteristics. But the polling reservation cycle is relatively long. The random reservation CFDAMA-RA algorithm increases the end-to-end delay due to the increase of collision when the load is high. When the load of CFDAMA-PB algorithm with piggyback reservation is high, the channel resource is monopolized by the terminal that has already accessed the channel, which makes the terminal with new access request unable to access the channel reservation resource in time, resulting in the packet backlog. End-to-end delay increases dramatically. In this paper, we combine random, polling and piggyback reservation methods, the advantages and disadvantages complement each other, and achieve better characteristics under low, medium and high load. (2) in the process of combining random, polling and piggyback reservation methods, For ON-OFF services with burst characteristics, in order to enable the service terminals in the OFF period to access the channel as soon as possible to make resource reservation, the proposed algorithm arranges the random reservation for the service terminals in the OFF period, and records the reservation scheduling order. Because there is a collision in random reservation, it is necessary to carry out Backoff retransmission after the collision. In order to avoid the secondary collision of the terminal that has already collided in the process of avoiding the retransmission, the satellite makes an appointment to the ground terminal where the collision occurs for the first time. Enable it to access the channel as soon as possible for subsequent appointments. In addition, in the process of arranging the random reservation for the service terminal in the OFF period, this paper optimizes the arrangement scheme, changing the static assignment mode to the dynamic one, thus reducing the collision probability and improving the performance of the algorithm. Finally, the CFDAMA-RPA algorithm is modeled and compared by opnet computer simulation. The results show that CFDAMA-RPA can achieve better average end-to-end delay / throughput performance and better fair access performance than CFDAMA-RA,CFDAMA-PB,CFDAMA-RR and other CFDAMA algorithms under the Pareto ON-OFF source model with high burst characteristics.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN927.2
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，本文編號(hào)：2251557
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