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  本文關(guān)鍵詞：LTE-A數(shù)字中繼隨機接入的研究　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 中繼節(jié)點 隨機接入 直接接入方案 前導(dǎo)碼分配方案 二進制指數(shù)退避算法

【摘要】：作為第四代移動通信系統(tǒng),LTE-A提出了中繼傳輸關(guān)鍵技術(shù),不但優(yōu)化了城市熱點區(qū)域,而且擴展了盲區(qū)、地鐵和農(nóng)村的小區(qū)覆蓋范圍。不論中繼接入基站還是用戶接入中繼,都必須先進行隨機接入過程,所以提高隨機接入的性能能夠提高無線通信系統(tǒng)的整體性能。本文首先介紹了中繼隨機接入研究的背景知識和基本概念,接著詳細(xì)分析了MAC層隨機接入的處理過程。針對LTE-A系統(tǒng)內(nèi)中繼的MAC層隨機接入處理過程不全面,接入時延大,碰撞率高等問題設(shè)計了MAC層功能架構(gòu)和三種MAC層隨機接入的算法機制,具體工作如下:1.為了提高中繼隨機接入的性能,本文在3GPP協(xié)議的基礎(chǔ)上設(shè)計了RN的MAC層隨機接入功能架構(gòu)和處理過程,包括中繼作為用戶的上行接入和中繼作為基站對接入處理的功能架構(gòu)。2.針對RN接入施主基站的現(xiàn)有方案,即RN必須執(zhí)行兩次隨機接入過程才能正式接入基站。本文提出了針對中繼的直接隨機接入過程,不但降低了中繼的接入時延,而且提高了中繼的接入概率。3.針對系統(tǒng)過載的情況,提出了基于重傳的前導(dǎo)碼分配方案,將新生成用戶和重傳用戶使用的前導(dǎo)碼分成兩組,以提高重傳用戶的接入概率,降低用戶的平均接入次數(shù)。4.針對現(xiàn)有的GB退避算法存在未考慮用戶公平性的問題,本文提出了NGB算法。該算法考慮了用戶的接入次數(shù),提高了用戶間的公平性。本文設(shè)計了RN的MAC層隨機接入功能架構(gòu),提出了三種MAC層隨機接入的算法機制,并進行了C++仿真和性能分析。
[Abstract]:As a 4th generation mobile communication system, LTE-A puts forward the key technology of relay transmission, which not only optimizes urban hot spots, but also expands blind areas. Whether the relay access base station or the user access relay, must first carry on the random access process. Therefore, improving the performance of random access can improve the overall performance of wireless communication systems. Firstly, this paper introduces the background knowledge and basic concepts of relay random access research. Then the processing process of random access in MAC layer is analyzed in detail. The random access process of MAC layer in LTE-A system is not comprehensive and the access delay is large. In order to improve the performance of relay random access, the functional architecture of MAC layer and three algorithms for random access in MAC layer are designed for the problem of high collision rate. The specific work is as follows: 1. Based on the 3GPP protocol, this paper designs the RN MAC layer random access function architecture and processing process. It includes the uplink access of the relay as the user and the functional architecture of the relay as the base station access processing. 2. The existing scheme for the RN access donor base station. That is, RN must perform two random access processes to formally access the base station. This paper proposes a direct random access process for relay, which not only reduces the relay access delay. Moreover, the access probability of relay is improved. 3. In view of the overload of the system, a preamble allocation scheme based on retransmission is proposed. The preamble codes used by the new generation user and the retransmission user are divided into two groups. In order to improve the access probability of retransmission users and reduce the average access times of users. 4. Aiming at the existing GB Backoff algorithm, there is a problem that the fairness of users is not considered. In this paper, NGB algorithm is proposed, which considers the number of users' access and improves the fairness between users. This paper designs the MAC layer random access function architecture of RN. Three algorithms for random access in MAC layer are proposed, and C simulation and performance analysis are carried out.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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本文編號：1404852