【摘要】：可見(jiàn)光通信因?yàn)榫哂刑峁┱彰�、頻譜免許可、綠色環(huán)保、安全性高等優(yōu)點(diǎn),成為近年來(lái)無(wú)線通信領(lǐng)域的研究熱點(diǎn)之一。本文主要研究室內(nèi)可見(jiàn)光通信場(chǎng)景下的媒體接入控制(MAC)層協(xié)議,主要工作如下:一、針對(duì)下行鏈路為多LED覆蓋方案,上行鏈路為傳統(tǒng)無(wú)線或紅外光方案的室內(nèi)可見(jiàn)光通信系統(tǒng),提出了將無(wú)線通信場(chǎng)景下的接入?yún)f(xié)議應(yīng)用于此室內(nèi)可見(jiàn)光通信場(chǎng)景下的調(diào)整方案,并改進(jìn)了接入方案中的退避算法。由于在多LED場(chǎng)景下,用戶終端不能相互偵聽(tīng),為了能夠使協(xié)調(diào)器掌握用戶終端的相對(duì)位置,因此在傳統(tǒng)無(wú)線的RTS/CTS模式基礎(chǔ)上,增加了一次RTS/CTS過(guò)程。推導(dǎo)了用戶接入碰撞概率和系統(tǒng)歸一化吞吐量的數(shù)學(xué)表達(dá)式。此外還針對(duì)接入方案中的退避算法,結(jié)合緩慢減小競(jìng)爭(zhēng)窗口方案和快速解決碰撞方案的優(yōu)點(diǎn),提出了改善用戶接入公平性的改進(jìn)方案。二、提出了一種改進(jìn)的自適應(yīng)保障時(shí)隙分配方案。結(jié)合不均勻的保障時(shí)隙分配方案和共享的保障時(shí)隙分配方案的優(yōu)點(diǎn),提出了改進(jìn)的自適應(yīng)保障時(shí)隙分配方案。改進(jìn)方案融合了前兩種方案,且用戶周期性的反饋到達(dá)速率,從而使得協(xié)調(diào)器能夠盡快調(diào)整保障時(shí)隙分配,避免由于用戶到達(dá)速率的迅速下降引起的保障時(shí)隙帶寬利用率的驟降。三、提出了可見(jiàn)光通信場(chǎng)景下的用戶接入和保障時(shí)隙分配優(yōu)先級(jí)實(shí)現(xiàn)方案。用戶接入優(yōu)先級(jí)方案的基本思路:高優(yōu)先級(jí)用戶設(shè)置較小的初始競(jìng)爭(zhēng)窗口和較小的最大退避階數(shù),而低優(yōu)先級(jí)用戶設(shè)置較大的初始競(jìng)爭(zhēng)窗口和較大的最大退避階數(shù)。與低優(yōu)先級(jí)用戶相比,高優(yōu)先級(jí)用戶更容易接入系統(tǒng)。此外還推導(dǎo)了優(yōu)先級(jí)接入的用戶接入碰撞概率和系統(tǒng)歸一化吞吐量的數(shù)學(xué)表達(dá)式。保障時(shí)隙分配的優(yōu)先級(jí)實(shí)現(xiàn)方案的思路:各個(gè)優(yōu)先級(jí)用戶可使用的保障時(shí)隙數(shù)目不定,與用戶申請(qǐng)保障時(shí)隙的到達(dá)速率有關(guān);高優(yōu)先級(jí)用戶可使用的保障時(shí)隙數(shù)目較多,相應(yīng)的保障時(shí)隙申請(qǐng)阻塞率較低;低優(yōu)先級(jí)用戶可使用的保障時(shí)隙數(shù)目較少,相應(yīng)的保障時(shí)隙申請(qǐng)阻塞率較高。四、對(duì)比分析了可見(jiàn)光通信場(chǎng)景下硬切換和軟切換性能差異。在介紹硬切換和軟切換方案的區(qū)別的基礎(chǔ)上,運(yùn)用排隊(duì)論方法,推導(dǎo)了兩種切換方案的新呼叫阻塞率和切換呼叫丟棄率這兩個(gè)性能指標(biāo)的數(shù)學(xué)表達(dá)式。
[Abstract]:The visible light communication has become one of the research hotspots in wireless communication field in recent years because of its advantages of providing lighting, spectrum exemption, environmental protection, high security and so on. This paper mainly studies the (MAC) layer protocol of media access control in indoor visible light communication scene. The main work is as follows: first, for indoor visible light communication system with multiple LED coverage scheme in downlink and traditional wireless or infrared light scheme in uplink, In this paper, the access protocol in wireless communication scenario is applied to the adjustment scheme of the indoor visible light communication scenario, and the Backoff algorithm in the access scheme is improved. Because the user terminal can not listen to each other in the multi-LED scenario, in order to enable the coordinator to grasp the relative position of the user terminal, a RTS/CTS process is added based on the traditional wireless RTS/CTS mode. The mathematical expressions of user access collision probability and system normalized throughput are derived. In addition, aiming at the Backoff algorithm in the access scheme, combining the advantages of the slow reduction of competitive window scheme and the fast collision resolution scheme, an improved scheme to improve the fairness of user access is proposed. Secondly, an improved adaptive guaranteed slot allocation scheme is proposed. An improved adaptive guaranteed slot allocation scheme is proposed by combining the advantages of uneven guaranteed slot allocation scheme and shared guaranteed slot allocation scheme. The improved scheme combines the first two schemes and the periodic feedback arrival rate of the user, which enables the coordinator to adjust the guaranteed slot allocation as soon as possible. To avoid the sudden drop of bandwidth utilization of guaranteed slot caused by the rapid decline of user arrival rate. Thirdly, the scheme of user access and time slot allocation priority in visible light communication is proposed. The basic idea of user access priority scheme is that high priority users set smaller initial contention window and smaller maximum Backoff order, while lower priority users set larger initial competition window and larger maximum Backoff order. High priority users have easier access to the system than low priority users. In addition, the mathematical expressions of user access collision probability and system normalized throughput for priority access are derived. The idea of the priority implementation scheme for guaranteeing slot allocation: the number of guaranteed slots available for each priority user is variable, which is related to the rate of arrival of the guaranteed slot, and the number of guaranteed slots that can be used by high-priority users is higher. The corresponding guaranteed slot request blocking rate is lower, and the low priority user can use less secure time slot number, and the corresponding guaranteed slot request blocking rate is higher. Fourthly, the performance differences between hard handoff and soft handoff in visible light communication scene are compared and analyzed. On the basis of introducing the differences between hard handoff and soft handoff schemes, the mathematical expressions of the new call blocking rate and the handoff call dropping rate of the two handoff schemes are derived by using the queuing theory method.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.1

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