密集小区干扰管理技术研究

发布时间：2018-03-23 00:38

本文选题：无线网络　切入点：4G　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着无线终端设备的大量普及,无线通信成为近年来通信信息领域应用最广、发展最快的一种通信方式。由于用户对更高的数据速率和更好的服务质量的强烈需求,各大运营商旨在寻求探索更高速率传输体制以及系统或网络的性能持续改进来提升用户体验。因此,移动通信发展迅速,从1G到5G的发展历程可以看出,宽带、快速、高效的通信系统越来越受到用户的青睐。然而,由于无线电波的传输特性,制约无线通信系统性能提升的主要因素为干扰问题,因此,需要对无线网络中存在的干扰问题进行深入研究,并提出可行的解决方案。研究近年来提升无线网络性能的各种方法,可以归纳出提升无线网络性能的解决方案主要分为两个方向,其一是采用新型技术手段,不断改进无线网络容量的上限,进一步提升密集小区用户通信质量;其二是采用新型的业务模型或者不同的假设条件,从理论上推导无线网络容量可达的边界值。本文主要是结合新型技术手段,设计具体的提升无线网络性能的解决方案。通过有效利用物理层的新型技术手段,本文给出了蜂窝小区边缘用户通信质量的进一步改善以及密集小区干扰管理技术的进一步研究。针对蜂窝小区边缘用户的性能改善问题,本文采用新型通信技术(D2D直传通信技术),针对不同小区的边缘用户以及同小区内的边缘用户通信质量的改善问题,分别提出了不同的解决方案。对于处于不同小区边缘的用户,通过利用以及扩展X2接口标准信令协议,设计了不同小区D2D通信协议,旨在解决蜂窝通信存在的传输和等待时间长,数据传输速率低,网络覆盖率低的问题。对于同小区内的边缘用户而言,通过利用D2D中继技术,选择具备D2D功能的用户设备作为中继,继而辅助同小区内D2D用户设备进行直传通信。由于利用中继方式进行辅助D2D通信,因此避免了路径损耗过大,故用户设备发射信号时可以降低发送功率,减小用户设备能耗,改善系统整体性能。针对小区之间的干扰问题,采用串行干扰避免技术,给出详细的无线网络链路调度的解决方案。通过利用并发链路之间干扰的可用部分,设计干扰联合调度机制,让更多的用户站点并发传输,充分的利用信道资源进而提升无线网络性能。仿真结果表明,文中所提出的图模型可以正确的建模基于串行干扰避免技术的链路调度问题,提出的贪婪算法具有较低的运算复杂度,可以快速求出调度集合。因此,当采用合理的调度机制时,利用串行干扰避免技术可以很好地改善网络性能,有效提高系统吞吐量。
[Abstract]:With the popularity of wireless terminal devices, wireless communication has become the most widely used and fastest growing communication mode in the field of communication information in recent years. Because of the strong demand of users for higher data rate and better quality of service, The major operators seek to explore higher rate transmission systems and continuous improvements in system or network performance to enhance the user experience. Therefore, mobile communication is developing rapidly, from 1G to 5G development can be seen, broadband, fast, Efficient communication systems are becoming more and more popular among users. However, because of the transmission characteristics of radio waves, interference is the main factor that restricts the performance improvement of wireless communication systems. It is necessary to deeply study the interference problem in wireless network, and put forward feasible solutions, and study various methods to improve the performance of wireless network in recent years. It can be concluded that the solution to improve the performance of wireless network can be divided into two directions. One is to improve the upper limit of wireless network capacity by adopting new technical means to further improve the communication quality of users in dense residential areas. The other is to deduce the boundary value of wireless network capacity by using new service model or different hypothetical conditions. To design specific solutions to improve the performance of wireless networks. Through the effective use of the physical layer of new technical means, In this paper, the further improvement of the communication quality of the edge users and the further research of the interference management technology of the dense cell are given. In this paper, a new communication technology, D2D direct communication technology, is used to solve the problem of improving the communication quality of edge users in different cells and the edge users in the same cell. By using and extending the standard signaling protocol of X2 interface, the paper designs D2D communication protocol in different cell, which aims to solve the problem of long transmission and waiting time and low data transmission rate in cellular communication. The problem of low network coverage. For the edge users in the same cell, by using D2D relay technology, the user equipment with D2D function is selected as relay. As a result of using relay mode to assist D2D communication, the path loss is avoided, so the transmission power can be reduced and the energy consumption of user equipment can be reduced when transmitting signals. To improve the overall performance of the system, the serial interference avoidance technology is adopted to solve the problem of intercellular interference, and a detailed solution for wireless network link scheduling is presented. The joint scheduling mechanism of interference is designed to allow more user stations to transmit simultaneously and to make full use of channel resources to improve the performance of wireless network. The simulation results show that, The graph model presented in this paper can correctly model the link scheduling problem based on serial interference avoidance technology. The proposed greedy algorithm has lower computational complexity and can quickly find the scheduling set. When reasonable scheduling mechanism is adopted, the network performance can be improved and the system throughput can be effectively improved by using serial interference avoidance technology.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5;TN972

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