LTE-Advanced中CoMP-JP技术研究及应用
发布时间：2019-03-07 15:56
【摘要】：为了改善小区边缘用户的通信性能,CoMP(Coordinated Multiple Points Transmission/Reception)技术应运而生。CoMP分为联合处理和协作调度/波束成形。本文主要关注CoMP联合处理技术。CoMP-JP技术可以有效地提高小区边缘用户的通信质量,促进了小区内用户通信的公平性。但是协作的基站之间需要相互交换信息,增加了额外的消耗,优缺点并存。论文研究了CoMP-JP(Joint Processing)技术中的协作区域与非协作区域的划分问题以及基于能效的多点协作传输问题,并将研究的内容应用到高速铁路移动通信和异构网络移动通信这两种实际的通信场景之中。论文研究内容如下:1、研究了小区线性排列时CoMP-JP技术中的协作区域与非协作区域的划分问题。考虑三个小区线性排列,定义了一个以协作区域划分半径为变量的效用函数来综合评价CoMP-JP技术的优缺点,得到了CoMP-JP的效用函数的优化模型。分别考虑小区用户均匀分布、高斯分布两种情形,分析效用函数与协作区域划分半径的关系,证明了最优解的存在,并提出了一种迭代算法,寻找此最优解。最后数值结果验证了效用函数与协作区域划分半径的关系,通过数值结果可以看出当用户在小区内的分布为高斯分布时,划分半径的单位变化对CoMP性能函数的影响比均匀分布的影响更大。2、研究了基于能效的CoMP-JP技术的优化问题。考虑一个多用户小区周围有多个小区基站可以参与协作通信,建立了CoMP-JP的能效优化问题。首先分析了不采用CoM-JP技术时系统的能效与相邻基站的个数成反比例关系。然后,研究了采用CoMP联合传输技术时系统的能效,通过优化问题简化,分析了系统的能效与协作基站数目关系,并分别提出了寻找最优协作基站数目和最优划分半径的算法。仿真结果表明若协作基站的数目过小或过大,系统的能效不高;同时最优协作基站的数目与协作区域半径有一定关系。3、研究了CoMP-JP技术在高铁移动通信中的一种应用方案。在高铁移动通信中,往往存在着越区切换和多普勒频移问题严重影响了用户通信的性能。首先建立了CoMP的效用函数与相邻小区最大重叠距离之间的优化模型。通过理论分析可知,此最大重叠距离存在最优值,使得在高铁通信中采用CoMP联合处理时系统的整体性能最优,提出了一种寻找这种最大重叠距离的算法。另外,还提出了一种高速铁路通信中采用CoMP-JP技术时的多普勒频移估计算法。仿真结果表明利用CoMP-JP技术方案有效提升系统的高铁通信中的小区的容量,降低了误码率。4、研究了CoMP-JP技术在异构网络移动通信中的一种应用方案。在异构网络通信中,往往存在许多种不同类型的基站,这些基站的发送功率各不相同。考虑了一个宏基站与若干个Pico基站共处于同一个小区之中,宏基站和Pico基站为微微小区内的用户共同传输数据。基于上面有关能效的理论研究,建立了系统的能效与Pico基站个数的关系的优化模型。仿真结果表明,当Pico基站的数目小于一个门限值时,系统的能效随着Pico基站数目的增多而逐渐增大,当Pico基站的数目超过某一个门限值时,系统的能效随着Pico基站数目的增多而逐渐降低。通过优化各种协作基站的数目,可以提升异构网络的能效。
[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.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：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.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN929.5
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