【摘要】：獨(dú)立模式的免許可頻段的長期演進(jìn)(Standalone Long-Term Evaluation in Unlicensed band,SALTE-U)系統(tǒng)是緩解許可頻段資源稀缺和移動(dòng)數(shù)據(jù)流量激增矛盾的主流解決方案之一。然而,SALTE-U系統(tǒng)與無線局域網(wǎng)(Wireless Local Area Networks,WLAN)在免許可頻段上競爭時(shí)頻資源,使得其信道時(shí)間上非連續(xù)、單次占用時(shí)長有限且再次信道占用時(shí)刻無法預(yù)知,造成用戶的資源時(shí)域位置失效、隨機(jī)接入的交互過程頻繁出錯(cuò)、用戶積累引發(fā)的沖突加劇、隨機(jī)接入沖突解決能力和上行數(shù)據(jù)傳輸能力之間難以兼顧。本學(xué)位論文研究SALTE-U系統(tǒng)中的資源定位、隨機(jī)接入和數(shù)據(jù)傳輸,設(shè)計(jì)可操作的方案和協(xié)議,給出沖突控制方法和資源分配優(yōu)化方法,進(jìn)行性能分析。針對(duì)SALTE-U系統(tǒng)的資源定位失效問題,研究面向信道非連續(xù)和時(shí)間不確定條件下的資源定位方法。我們提出有效信道和有效幀號(hào)的概念,以排除信道的時(shí)間不確定性帶來的影響。我們?cè)O(shè)計(jì)有效幀號(hào)的生成方法和更新規(guī)則,給出有效幀號(hào)的搭載位置和解析方法,推導(dǎo)關(guān)于有效幀號(hào)的資源定位表達(dá)式,以保證計(jì)算得到的資源時(shí)域位置始終落在信道占用時(shí)段中且子幀類別始終正確。我們給出資源定位的性能指標(biāo)和統(tǒng)計(jì)公式,并驗(yàn)證所提方案的有效性。針對(duì)SALTE-U系統(tǒng)隨機(jī)接入沖突嚴(yán)重和信道非連續(xù)條件下現(xiàn)有隨機(jī)接入?yún)f(xié)議不可用的難題,研究新的隨機(jī)接入?yún)f(xié)議和沖突控制方法。我們?cè)O(shè)計(jì)一種基于有效信道和有效窗長的隨機(jī)接入?yún)f(xié)議,避免因本系統(tǒng)的信道資源特點(diǎn)導(dǎo)致交互過程難以完成和用戶長期滯留在隨機(jī)接入過程,以提高系統(tǒng)性能和信道利用率。我們提出重傳概率指數(shù)衰減的沖突控制方法,以緩解因信道斷續(xù)造成的用戶在非信道占用期間大量積累而在信道占用期間同時(shí)發(fā)起隨機(jī)接入過程導(dǎo)致的劇烈的用戶沖突。定義接入率、重選率和平均時(shí)延這三個(gè)性能指標(biāo),用于衡量隨機(jī)接入的性能。進(jìn)行性能分析,推導(dǎo)得到上述性能指標(biāo)的表達(dá)式。進(jìn)而驗(yàn)證所提隨機(jī)接入?yún)f(xié)議和沖突控制方法的有效性。針對(duì)SALTE-U系統(tǒng)的隨機(jī)接入沖突解決能力和上行數(shù)據(jù)傳輸能力之間的矛盾,研究最優(yōu)隨機(jī)接入信道(Random Access Channel,RACH)數(shù)目配置方法。以隨機(jī)接入成功概率和平均接入時(shí)延為約束,建立使可供數(shù)據(jù)傳輸?shù)纳闲泄蚕硇诺罃?shù)目最大的優(yōu)化問題。提出聯(lián)合到達(dá)率估計(jì)和最大似然估計(jì)的用戶數(shù)預(yù)測方法,得到關(guān)于當(dāng)前用戶數(shù)的解析式。提出最優(yōu)RACH數(shù)目的求取算法,用于求解優(yōu)化問題得到最優(yōu)的RACH數(shù)目,從而實(shí)現(xiàn)沖突解決能力和上行數(shù)據(jù)傳輸能力之間的平衡。
[Abstract]:Long-Term Evolution (Standalone Long-Term Evaluation in Unlicensed band,SALTE-U) system with independent mode is one of the main solutions to alleviate the contradiction between resource scarcity and mobile data traffic surge in licensed frequency band. However, the SALTE-U system competes with the wireless LAN (Wireless Local Area Networks,WLAN) in the free frequency band, which makes the channel time discontinuous, the time of single occupation is limited and the time of channel occupation is unpredictable, which results in the time domain position of the user's resources being invalid. The interactive process of random access frequently goes wrong and the conflicts caused by user accumulation are aggravated. It is difficult to balance the conflict resolution ability of random access and the ability of uplink data transmission. This thesis studies the resource location, random access and data transmission in SALTE-U system, designs operable schemes and protocols, gives conflict control methods and resource allocation optimization methods, and analyzes the performance. In order to solve the problem of resource location failure in SALTE-U system, the resource location method under the condition of channel discontinuity and time uncertainty is studied. We propose the concepts of effective channel and effective frame number to eliminate the influence of channel time uncertainty. We design the generation method and update rule of the effective frame number, give the carrying position and analytical method of the effective frame number, and deduce the expression of resource location about the effective frame number. In order to ensure that the calculated time domain position of the resource always falls in the channel occupation period and the subframe category is always correct. The performance index and statistical formula of resource location are given, and the validity of the proposed scheme is verified. A new random access protocol and conflict control method are proposed to solve the problem that the random access protocol is not available under the condition of serious random access conflict and discontinuous channel in SALTE-U system. In order to improve system performance and channel utilization, we design a random access protocol based on effective channel and effective window length, which can avoid the difficulty to complete the interaction process and the long stay of users in the random access process due to the channel resource characteristics of the system. We propose a collision control method based on exponential attenuation of retransmission probability in order to mitigate the severe user conflicts caused by the excessive accumulation of users during the non-channel occupancy period and the simultaneous initiation of random access process during the channel occupancy period. Three performance indexes, namely, access rate, reselection rate and average delay, are defined to measure the performance of random access. The performance analysis is carried out and the expression of the above performance index is derived. Furthermore, the effectiveness of the proposed random access protocol and conflict control method is verified. Aiming at the contradiction between random access conflict resolution and uplink data transmission in SALTE-U system, the optimal random access channel (Random Access Channel,RACH) number allocation method is studied. With the constraints of random access success probability and average access delay, an optimization problem is proposed to maximize the number of shared uplink channels available for data transmission. A method for predicting the number of users based on joint arrival rate estimation and maximum likelihood estimation is proposed, and an analytical formula for the current number of users is obtained. An algorithm for finding the optimal number of RACH is proposed, which is used to solve the optimization problem to obtain the optimal number of RACH, so as to achieve the balance between the conflict resolution capability and the uplink data transmission capability.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5

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