LTE-Advanced中CoMP-JP技術(shù)研究及應(yīng)用
發(fā)布時間：2019-03-07 15:56
【摘要】：為了改善小區(qū)邊緣用戶的通信性能,CoMP(Coordinated Multiple Points Transmission/Reception)技術(shù)應(yīng)運而生。CoMP分為聯(lián)合處理和協(xié)作調(diào)度/波束成形。本文主要關(guān)注CoMP聯(lián)合處理技術(shù)。CoMP-JP技術(shù)可以有效地提高小區(qū)邊緣用戶的通信質(zhì)量,促進了小區(qū)內(nèi)用戶通信的公平性。但是協(xié)作的基站之間需要相互交換信息,增加了額外的消耗,優(yōu)缺點并存。論文研究了CoMP-JP(Joint Processing)技術(shù)中的協(xié)作區(qū)域與非協(xié)作區(qū)域的劃分問題以及基于能效的多點協(xié)作傳輸問題,并將研究的內(nèi)容應(yīng)用到高速鐵路移動通信和異構(gòu)網(wǎng)絡(luò)移動通信這兩種實際的通信場景之中。論文研究內(nèi)容如下:1、研究了小區(qū)線性排列時CoMP-JP技術(shù)中的協(xié)作區(qū)域與非協(xié)作區(qū)域的劃分問題�？紤]三個小區(qū)線性排列,定義了一個以協(xié)作區(qū)域劃分半徑為變量的效用函數(shù)來綜合評價CoMP-JP技術(shù)的優(yōu)缺點,得到了CoMP-JP的效用函數(shù)的優(yōu)化模型。分別考慮小區(qū)用戶均勻分布、高斯分布兩種情形,分析效用函數(shù)與協(xié)作區(qū)域劃分半徑的關(guān)系,證明了最優(yōu)解的存在,并提出了一種迭代算法,尋找此最優(yōu)解。最后數(shù)值結(jié)果驗證了效用函數(shù)與協(xié)作區(qū)域劃分半徑的關(guān)系,通過數(shù)值結(jié)果可以看出當用戶在小區(qū)內(nèi)的分布為高斯分布時,劃分半徑的單位變化對CoMP性能函數(shù)的影響比均勻分布的影響更大。2、研究了基于能效的CoMP-JP技術(shù)的優(yōu)化問題。考慮一個多用戶小區(qū)周圍有多個小區(qū)基站可以參與協(xié)作通信,建立了CoMP-JP的能效優(yōu)化問題。首先分析了不采用CoM-JP技術(shù)時系統(tǒng)的能效與相鄰基站的個數(shù)成反比例關(guān)系。然后,研究了采用CoMP聯(lián)合傳輸技術(shù)時系統(tǒng)的能效,通過優(yōu)化問題簡化,分析了系統(tǒng)的能效與協(xié)作基站數(shù)目關(guān)系,并分別提出了尋找最優(yōu)協(xié)作基站數(shù)目和最優(yōu)劃分半徑的算法。仿真結(jié)果表明若協(xié)作基站的數(shù)目過小或過大,系統(tǒng)的能效不高;同時最優(yōu)協(xié)作基站的數(shù)目與協(xié)作區(qū)域半徑有一定關(guān)系。3、研究了CoMP-JP技術(shù)在高鐵移動通信中的一種應(yīng)用方案。在高鐵移動通信中,往往存在著越區(qū)切換和多普勒頻移問題嚴重影響了用戶通信的性能。首先建立了CoMP的效用函數(shù)與相鄰小區(qū)最大重疊距離之間的優(yōu)化模型。通過理論分析可知,此最大重疊距離存在最優(yōu)值,使得在高鐵通信中采用CoMP聯(lián)合處理時系統(tǒng)的整體性能最優(yōu),提出了一種尋找這種最大重疊距離的算法。另外,還提出了一種高速鐵路通信中采用CoMP-JP技術(shù)時的多普勒頻移估計算法。仿真結(jié)果表明利用CoMP-JP技術(shù)方案有效提升系統(tǒng)的高鐵通信中的小區(qū)的容量,降低了誤碼率。4、研究了CoMP-JP技術(shù)在異構(gòu)網(wǎng)絡(luò)移動通信中的一種應(yīng)用方案。在異構(gòu)網(wǎng)絡(luò)通信中,往往存在許多種不同類型的基站,這些基站的發(fā)送功率各不相同�？紤]了一個宏基站與若干個Pico基站共處于同一個小區(qū)之中,宏基站和Pico基站為微微小區(qū)內(nèi)的用戶共同傳輸數(shù)據(jù)�；谏厦嬗嘘P(guān)能效的理論研究,建立了系統(tǒng)的能效與Pico基站個數(shù)的關(guān)系的優(yōu)化模型。仿真結(jié)果表明,當Pico基站的數(shù)目小于一個門限值時,系統(tǒng)的能效隨著Pico基站數(shù)目的增多而逐漸增大,當Pico基站的數(shù)目超過某一個門限值時,系統(tǒng)的能效隨著Pico基站數(shù)目的增多而逐漸降低。通過優(yōu)化各種協(xié)作基站的數(shù)目,可以提升異構(gòu)網(wǎng)絡(luò)的能效。
[Abstract]:In order to improve the communication performance of cell edge users, the coordinated multiple points transmission/ reception (CoMP) technology has come into being. CoMP is divided into joint processing and cooperative scheduling/ beam forming. This paper focuses on the joint processing technology of CoMP. The CoMP-JP technique can effectively improve the communication quality of the cell edge user and promote the fairness of user communication in the cell. But there is a need for exchanging information between the cooperating base stations, increasing the additional consumption, and the advantages and disadvantages. In this paper, the division of cooperative and non-cooperative areas in the technology of CoMP-JP (Joint Processing) and the problem of multi-point cooperative transmission based on energy efficiency are studied, and the content of the research is applied to the two practical communication scenarios of high-speed railway mobile communication and heterogeneous network mobile communication. The research contents of this paper are as follows:1. The problem of the division of the cooperative region and the non-cooperative region in the CoMP-JP technology in the linear arrangement of the cells is studied. Considering the linear arrangement of the three cells, the advantages and disadvantages of the CoMP-JP technology are comprehensively evaluated by using the utility function of the division radius of the cooperative region as a variable, and the optimization model of the utility function of the CoMP-JP is obtained. In this paper, the relationship between the utility function and the partition radius of the cooperative area is analyzed, the existence of the optimal solution is proved, and an iterative algorithm is proposed to find the optimal solution. The numerical results show that when the distribution of the user in the cell is Gaussian, the influence of the unit change of the division radius on the function of the CoMP performance is more than that of the uniform distribution. The optimization of CoMP-JP technology based on energy efficiency is studied. Considering that a plurality of cell base stations around a multi-user cell can participate in the cooperative communication, the energy efficiency optimization problem of the CoMP-JP is established. First, the relationship between the energy efficiency of the system and the number of adjacent base stations in the absence of the CoM-JP technique is analyzed. Then, the energy efficiency of the system when using the joint transmission technique of CoMP is studied, the relationship between the energy efficiency of the system and the number of cooperative base stations is analyzed through the optimization of the problem, and an algorithm for finding the optimal number of cooperative base stations and the optimal division radius is presented. The simulation results show that if the number of the cooperative base stations is too small or too large, the energy efficiency of the system is not high, and the number of the optimal cooperative base stations has a certain relation with the radius of the cooperative area. In the high-speed railway mobile communication, the problem of hand-off and Doppler frequency shift often has a serious influence on the performance of the user's communication. First, the optimal model between the utility function of CoMP and the maximum overlap distance of adjacent cells is established. It is known from the theoretical analysis that the maximum overlap distance is the best value, so that the overall performance of the system is optimal when the CoMP joint processing is adopted in the high-speed rail communication, and an algorithm for finding the maximum overlap distance is proposed. In addition, a Doppler frequency shift estimation algorithm is proposed in the high-speed railway communication using the CoMP-JP technique. The simulation results show that the capacity of the cell in the high-speed rail communication of the system is effectively improved by using the CoMP-JP technology, and the bit error rate is reduced. In heterogeneous network communication, there are many different types of base stations, and the transmission power of these base stations is different. Considering that a macro base station and a number of Pico base stations are in the same cell, the macro base station and the Pico base station transmit data together with the users in the picocell. Based on the above theoretical research on energy efficiency, the optimal model of the relationship between the energy efficiency of the system and the number of Pico base stations is established. The simulation results show that when the number of Pico base stations is less than one threshold, the energy efficiency of the system gradually increases with the number of Pico base stations, and when the number of the Pico base stations exceeds a certain threshold, the energy efficiency of the system gradually decreases with the number of the Pico base stations. By optimizing the number of various cooperating base stations, the energy efficiency of the heterogeneous network can be improved.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN929.5
[Abstract]:In order to improve the communication performance of cell edge users, the coordinated multiple points transmission/ reception (CoMP) technology has come into being. CoMP is divided into joint processing and cooperative scheduling/ beam forming. This paper focuses on the joint processing technology of CoMP. The CoMP-JP technique can effectively improve the communication quality of the cell edge user and promote the fairness of user communication in the cell. But there is a need for exchanging information between the cooperating base stations, increasing the additional consumption, and the advantages and disadvantages. In this paper, the division of cooperative and non-cooperative areas in the technology of CoMP-JP (Joint Processing) and the problem of multi-point cooperative transmission based on energy efficiency are studied, and the content of the research is applied to the two practical communication scenarios of high-speed railway mobile communication and heterogeneous network mobile communication. The research contents of this paper are as follows:1. The problem of the division of the cooperative region and the non-cooperative region in the CoMP-JP technology in the linear arrangement of the cells is studied. Considering the linear arrangement of the three cells, the advantages and disadvantages of the CoMP-JP technology are comprehensively evaluated by using the utility function of the division radius of the cooperative region as a variable, and the optimization model of the utility function of the CoMP-JP is obtained. In this paper, the relationship between the utility function and the partition radius of the cooperative area is analyzed, the existence of the optimal solution is proved, and an iterative algorithm is proposed to find the optimal solution. The numerical results show that when the distribution of the user in the cell is Gaussian, the influence of the unit change of the division radius on the function of the CoMP performance is more than that of the uniform distribution. The optimization of CoMP-JP technology based on energy efficiency is studied. Considering that a plurality of cell base stations around a multi-user cell can participate in the cooperative communication, the energy efficiency optimization problem of the CoMP-JP is established. First, the relationship between the energy efficiency of the system and the number of adjacent base stations in the absence of the CoM-JP technique is analyzed. Then, the energy efficiency of the system when using the joint transmission technique of CoMP is studied, the relationship between the energy efficiency of the system and the number of cooperative base stations is analyzed through the optimization of the problem, and an algorithm for finding the optimal number of cooperative base stations and the optimal division radius is presented. The simulation results show that if the number of the cooperative base stations is too small or too large, the energy efficiency of the system is not high, and the number of the optimal cooperative base stations has a certain relation with the radius of the cooperative area. In the high-speed railway mobile communication, the problem of hand-off and Doppler frequency shift often has a serious influence on the performance of the user's communication. First, the optimal model between the utility function of CoMP and the maximum overlap distance of adjacent cells is established. It is known from the theoretical analysis that the maximum overlap distance is the best value, so that the overall performance of the system is optimal when the CoMP joint processing is adopted in the high-speed rail communication, and an algorithm for finding the maximum overlap distance is proposed. In addition, a Doppler frequency shift estimation algorithm is proposed in the high-speed railway communication using the CoMP-JP technique. The simulation results show that the capacity of the cell in the high-speed rail communication of the system is effectively improved by using the CoMP-JP technology, and the bit error rate is reduced. In heterogeneous network communication, there are many different types of base stations, and the transmission power of these base stations is different. Considering that a macro base station and a number of Pico base stations are in the same cell, the macro base station and the Pico base station transmit data together with the users in the picocell. Based on the above theoretical research on energy efficiency, the optimal model of the relationship between the energy efficiency of the system and the number of Pico base stations is established. The simulation results show that when the number of Pico base stations is less than one threshold, the energy efficiency of the system gradually increases with the number of Pico base stations, and when the number of the Pico base stations exceeds a certain threshold, the energy efficiency of the system gradually decreases with the number of the Pico base stations. By optimizing the number of various cooperating base stations, the energy efficiency of the heterogeneous network can be improved.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TN929.5
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