Device to Device通信冲突问题研究
发布时间：2019-05-16 20:41
【摘要】：随着智能终端用户的持续增长,多媒体服务的需求急剧增加,有限的频谱资源和人们日益增长的多媒体需求已经成为移动通信中的主要矛盾。D2D (Device to Device)通信作为近期无线领域研究的一个热门话题,得到了许多设备厂商和运营商的广泛关注。它可以实现短距离高速率通信,提高资源利用率,且工作在许可频段,可以提供稳定可靠高质的服务。因此,D2D通信是一种极具潜力的高容量、低成本的局域技术。 相对于集中式D2D通信系统,分布式D2D通信系统具有灵活性高、信令交互少、频谱利用率高等特点。近期,高通公司提出的FLQ (FlashLinQ)方案，，是典型的分布式D2D通信系统,也是较为成熟的D2D通信方案。与其他D2D通信系统相比,FLQ可以提供更广的发现范围和更高的数据传输速率。在分布式D2D通信系统中,资源选择冲突问题不仅严重影响网络的吞吐量、容量,增加数据传输时延,而且会降低用户体验。因此,是否能够及时的避免冲突或解决冲突,成为衡量D2D通信系统设计方案好坏的重要标准之一。 本文基于FLQ系统,对分布式D2D通信资源选择冲突问题进行研究。首先介绍了D2D通信的发展背景及研究现状,并分析了分布式D2D通信的实现原理,对FLQ系统的设计进行整体阐述。从FLQ系统的方案可以看出,发现和数据传输阶段均存在资源选择冲突问题。然后,本文介绍了无线通信中MAC (Media Access Control)层常用的随机接入协议,并从基于协议和基于信号处理两方面归纳总结了MAC层冲突解决算法,分析了各个算法的优点及不足。 本文重点分析了FLQ系统中发现阶段和数据传输阶段的冲突问题解决方法。研究表明数据传输阶段中Rx/Tx-Yielding机制存在过度服从的问题,针对此现象,本文提出一种改进方案,通过控制发送DPS (Direct power Signal)概率,解决过度服从的问题。本文搭建了仿真平台,对Rx/Tx-Yielding机制以及改进方案进行仿真。首先给出了仿真参数,并通过对系统数据传输速率和中断概率的仿真,得出Rx/Tx-Yielding机制的最佳SIR (Signal to Interference Ratio)门限,然后从平均链路传输对数、数据传输速率和公平性三个方面对两种方案进行对比。仿真结果表明,改进方案在平均链路传输对数和数据传输速率两方面均优于原方案,可以有效减轻过度服从问题。
[Abstract]:With the continuous growth of intelligent end-users, the demand for multimedia services has increased dramatically. Limited spectrum resources and increasing multimedia demand have become the main contradiction in mobile communication. D2D (Device to Device) communication has become a hot topic in the field of wireless research in the near future. It has been widely concerned by many equipment manufacturers and operators. It can realize short distance and high speed communication, improve the utilization of resources, and work in the licensed frequency band, and can provide stable, reliable and high quality service. Therefore, D 2 D communication is a potential local technology with high capacity and low cost. Compared with centralized D2D communication system, distributed D2D communication system has the characteristics of high flexibility, less signaling interaction, high spectrum efficiency and so on. Recently, the FLQ (FlashLinQ) scheme proposed by Qualcomm Company is not only a typical distributed D2D communication system, but also a more mature D2D communication scheme. Compared with other D2D communication systems, FLQ can provide a wider discovery range and higher data transmission rate. In distributed D2D communication system, the problem of resource selection conflict not only seriously affects the throughput and capacity of the network, but also increases the data transmission delay, but also reduces the user experience. Therefore, whether the conflict can be avoided or resolved in time has become one of the important standards to measure the design scheme of D2D communication system. In this paper, based on FLQ system, the conflict problem of distributed D 2 D communication resource selection is studied. Firstly, the development background and research status of D2D communication are introduced, the realization principle of distributed D2D communication is analyzed, and the design of FLQ system is described as a whole. From the scheme of FLQ system, it can be seen that there is a conflict of resource selection in both discovery and data transmission stages. Then, this paper introduces the random access protocols commonly used in MAC (Media Access Control) layer in wireless communication, summarizes the MAC layer conflict resolution algorithms from two aspects: protocol based and signal processing, and analyzes the advantages and disadvantages of each algorithm. This paper focuses on the conflict solution between discovery stage and data transmission stage in FLQ system. The research shows that there is the problem of excessive obedience in Rx/Tx-Yielding mechanism in the stage of data transmission. In view of this phenomenon, this paper proposes an improved scheme to solve the problem of excessive obedience by controlling the probability of sending DPS (Direct power Signal). In this paper, a simulation platform is built to simulate the Rx/Tx-Yielding mechanism and the improved scheme. Firstly, the simulation parameters are given, and the optimal SIR (Signal to Interference Ratio) threshold of Rx/Tx-Yielding mechanism is obtained by simulating the data transmission rate and outage probability of the system, and then the logarithm of transmission from the average link is obtained. The data transmission rate and fairness are compared between the two schemes. The simulation results show that the improved scheme is superior to the original scheme in both average link transmission logarithm and data transmission rate, and can effectively reduce the problem of excessive obedience.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92
本文编号：2478545
[Abstract]:With the continuous growth of intelligent end-users, the demand for multimedia services has increased dramatically. Limited spectrum resources and increasing multimedia demand have become the main contradiction in mobile communication. D2D (Device to Device) communication has become a hot topic in the field of wireless research in the near future. It has been widely concerned by many equipment manufacturers and operators. It can realize short distance and high speed communication, improve the utilization of resources, and work in the licensed frequency band, and can provide stable, reliable and high quality service. Therefore, D 2 D communication is a potential local technology with high capacity and low cost. Compared with centralized D2D communication system, distributed D2D communication system has the characteristics of high flexibility, less signaling interaction, high spectrum efficiency and so on. Recently, the FLQ (FlashLinQ) scheme proposed by Qualcomm Company is not only a typical distributed D2D communication system, but also a more mature D2D communication scheme. Compared with other D2D communication systems, FLQ can provide a wider discovery range and higher data transmission rate. In distributed D2D communication system, the problem of resource selection conflict not only seriously affects the throughput and capacity of the network, but also increases the data transmission delay, but also reduces the user experience. Therefore, whether the conflict can be avoided or resolved in time has become one of the important standards to measure the design scheme of D2D communication system. In this paper, based on FLQ system, the conflict problem of distributed D 2 D communication resource selection is studied. Firstly, the development background and research status of D2D communication are introduced, the realization principle of distributed D2D communication is analyzed, and the design of FLQ system is described as a whole. From the scheme of FLQ system, it can be seen that there is a conflict of resource selection in both discovery and data transmission stages. Then, this paper introduces the random access protocols commonly used in MAC (Media Access Control) layer in wireless communication, summarizes the MAC layer conflict resolution algorithms from two aspects: protocol based and signal processing, and analyzes the advantages and disadvantages of each algorithm. This paper focuses on the conflict solution between discovery stage and data transmission stage in FLQ system. The research shows that there is the problem of excessive obedience in Rx/Tx-Yielding mechanism in the stage of data transmission. In view of this phenomenon, this paper proposes an improved scheme to solve the problem of excessive obedience by controlling the probability of sending DPS (Direct power Signal). In this paper, a simulation platform is built to simulate the Rx/Tx-Yielding mechanism and the improved scheme. Firstly, the simulation parameters are given, and the optimal SIR (Signal to Interference Ratio) threshold of Rx/Tx-Yielding mechanism is obtained by simulating the data transmission rate and outage probability of the system, and then the logarithm of transmission from the average link is obtained. The data transmission rate and fairness are compared between the two schemes. The simulation results show that the improved scheme is superior to the original scheme in both average link transmission logarithm and data transmission rate, and can effectively reduce the problem of excessive obedience.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92
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