本文關(guān)鍵詞： LTE MAC 調(diào)度算法 HARQ 信道質(zhì)量指示　出處：《北京交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：為了提高移動(dòng)通信業(yè)務(wù)的質(zhì)量,以適應(yīng)快速增長(zhǎng)的用戶數(shù)據(jù)量需求,也為了應(yīng)對(duì)來(lái)自WiMax、Wi-Fi等無(wú)線寬帶接入技術(shù)的挑戰(zhàn),2004年底3GPP開始了LTE(Long Term Evolution,長(zhǎng)期演進(jìn))的標(biāo)準(zhǔn)化進(jìn)程來(lái)更完善地使3G技術(shù)平滑過渡到4G技術(shù)。頻譜帶寬是無(wú)線通信系統(tǒng)中最珍貴的資源。一種無(wú)線調(diào)度算法的高效性主要表現(xiàn)在可以讓錯(cuò)誤鏈路上的無(wú)效數(shù)據(jù)傳輸最小化,盡量減少頻譜資源的浪費(fèi),從而實(shí)現(xiàn)系統(tǒng)吞吐量的最大化。LTE提高了業(yè)務(wù)的服務(wù)質(zhì)量和峰值速率,而其采用的HARQ(Hybrid Automatic Repeat Request,混合自動(dòng)請(qǐng)求重傳)就是一種可以有效確保高服務(wù)質(zhì)量和高數(shù)據(jù)速率傳輸?shù)年P(guān)鍵技術(shù)。 論文首先概括了移動(dòng)通信系統(tǒng)簡(jiǎn)史和3GPP LTE相關(guān)的網(wǎng)絡(luò)架構(gòu)、性能指標(biāo)與關(guān)鍵技術(shù)。簡(jiǎn)要介紹了調(diào)度算法與HARQ的研究現(xiàn)狀以及本論文的主要研究?jī)?nèi)容和組織結(jié)構(gòu)。同時(shí)對(duì)LTE MAC (Medium Access Control,媒體接入控制)子系統(tǒng)的模塊功能進(jìn)行了介紹,尤其對(duì)上下行調(diào)度功能模塊和上下行HARQ功能模塊進(jìn)行了詳細(xì)的描述。 其次,詳細(xì)介紹了用于非實(shí)時(shí)數(shù)據(jù)業(yè)務(wù)和實(shí)時(shí)數(shù)據(jù)業(yè)務(wù)的經(jīng)典調(diào)度算法。并在比例公平調(diào)度算法的基礎(chǔ)上提出了實(shí)時(shí)與非實(shí)時(shí)業(yè)務(wù)混合的綜合調(diào)度算法,該算法在用戶優(yōu)先級(jí)的表達(dá)式中加入了時(shí)延影響因子。不僅能最大化系統(tǒng)吞吐量,還保證了服務(wù)業(yè)務(wù)的多樣性。通過系統(tǒng)仿真,與比例公平調(diào)度算法在系統(tǒng)吞吐量、丟包率、數(shù)據(jù)速率公平性以及包超時(shí)延門限的公平性方面進(jìn)行性能的比較,驗(yàn)證了該綜合調(diào)度算法的有效性和實(shí)用性。 最后,論文描述了協(xié)議中TDD系統(tǒng)HARQ ACK反饋方案及空口質(zhì)量指標(biāo)CQI(Channel Quality Indicator,信道質(zhì)量指示)的相關(guān)知識(shí),進(jìn)而提出了一種基于UE空口質(zhì)量的HARQ ACK/NACK復(fù)用反饋判決算法。該算法是基于HARQ ACK/NACK復(fù)用模式,是在4個(gè)下行鏈路子幀對(duì)應(yīng)一個(gè)上行鏈路子幀,反饋結(jié)果存在二義性的情況時(shí)提出的。該算法基于UE空口質(zhì)量進(jìn)行判決,提高了判斷的可靠性,并且減小了數(shù)據(jù)誤判的次數(shù),提高了系統(tǒng)資源的利用率。文中給出了該算法思想及其步驟。通過仿真與目前反饋方案進(jìn)行比較,驗(yàn)證了該判決算法的有效性。
[Abstract]:In order to improve the quality of mobile communication services and adapt to the rapid growth of user data demand, In order to meet the challenge of wireless broadband access technology such as WiMax Wi-Fi, 3GPP started the standardization process of LTE(Long Term evolution in late 2004 to improve the smooth transition of 3G technology to 4G technology. Spectrum bandwidth is a wireless communication system. The efficiency of a wireless scheduling algorithm can be achieved by minimizing invalid data transmission on an error link. The waste of spectrum resources is minimized to maximize system throughput. LTE improves service quality and peak rate. HARQ(Hybrid Automatic Repeat request (hybrid automatic request retransmission) is a key technology which can effectively ensure high quality of service and high data rate transmission. Firstly, the brief history of mobile communication system and the network architecture related to 3GPP LTE are summarized. This paper briefly introduces the research status of scheduling algorithm and HARQ, as well as the main research content and organization structure of this paper. At the same time, the module functions of LTE MAC medium Access Control (Media access Control) subsystem are introduced. In particular, the uplink and downlink scheduling function modules and uplink and downlink HARQ function modules are described in detail. Secondly, the classical scheduling algorithms for non-real-time data services and real-time data services are introduced in detail, and a hybrid scheduling algorithm for real-time and non-real-time services is proposed on the basis of proportional fair scheduling algorithm. The algorithm not only maximizes system throughput, but also ensures diversity of service services. Through system simulation, proportional fair scheduling algorithm is applied to system throughput and packet loss rate. Data rate fairness and packet timeout delay threshold fairness are compared to verify the effectiveness and practicability of the proposed algorithm. Finally, this paper describes the HARQ ACK feedback scheme of TDD system and the channel quality indicator (CQI(Channel Quality indicator). Furthermore, a feedback decision algorithm for HARQ ACK/NACK multiplexing based on UE quality is proposed. The algorithm is based on HARQ ACK/NACK multiplexing mode and corresponds to one uplink sub-frame in four downlink subframes. When the feedback result is ambiguous, the algorithm is based on the quality of UE void, which improves the reliability of the judgment and reduces the number of data misjudgment. The idea and steps of the algorithm are given. The validity of the decision algorithm is verified by comparing the simulation with the current feedback scheme.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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