基于社交网络的D2D通信技术研究

发布时间：2018-06-12 15:47

本文选题：D2D + 用户发现　；参考：《南京邮电大学》2016年硕士论文

【摘要】：随着移动业务的爆炸性增长,传统蜂窝网络面临着巨大挑战,如频谱资源稀缺、基站超负载工作以及通信链路拥挤等,极大限制了未来网络的发展。由此,允许终端之间通过复用小区资源直接进行通信的D2D(Device-to-Device)技术运用而生。作为下一代无线通信研究的关键技术之一,D2D通信在减轻蜂窝网络负担、提升能量效率、扩大通信范围以及提高传输速率等方面具有巨大优势。此外,手持移动通信设备的用户会自发形成相对稳定、具有一定复杂网络规律的移动社交网络模型。因此,本文将社交网络与D2D通信有机结合,考虑用户之间的网络拓扑,从社交网络的角度研究D2D通信技术。所完成的工作包括如下内容:(1)对比分析了D2D通信中几种关键技术的特点,总结D2D通信与传统蜂窝通信、传统近距离点对点通信相比存在的优劣势。同时,简要介绍了本文所用到的网络理论及其数学表达,并阐述社交网络的特点,为后文的理论研究奠定基础。(2)研究基于社交关系的D2D用户发现技术。作为D2D通信建立的第一步,其旨在有效发现潜在的邻居用户。现有的用户发现策略存在发现速度慢、不安全等局限性。针对此问题,本文研究了基于社交关系的按需用户发现策略。根据用户请求和缓存文件的分布特性以及基站反馈更新的用户社交关系来发现邻居用户集。此外,本文还考虑了用户在系统中的信誉来避免恶意、攻击节点的破坏行为。理论分析及仿真结果表明,该策略可以更有效地发现邻居用户,提升D2D链路建立的安全性。(3)研究基于社交网络的D2D文件共享机制。现有的D2D文件共享研究存在未充分考虑用户的社交状态、系统共享文件单一、忽略用户信任度等问题。针对此问题,本文分析蜂窝网协助下基于社交网络的文件共享机制。该机制根据用户的需求,将用户划分为若干临时小组,在组内充分考虑用户的社交状态、信任度以及用户节点间的效用函数来选取D2D通信或者蜂窝通信模式,目标文件优先选择D2D通信模式共享。此外,为了避免用户的自我干扰,D2D用户在同一时间仅能处理(接收或发送)一个请求,为了解决此问题,本文采用多轮循环策略。理论研究和仿真结果表明,选择社交网络中具有最大社交度的用户作为中央用户共享文件,可大大降低传输时延、减轻基站负载、优化蜂窝通信系统的整体性能。本文研究工作在解决无线资源日趋紧缺的瓶颈问题以及确保文件传输的安全性方面具有十分重要的理论意义和实用价值。
[Abstract]:With the explosive growth of mobile services, traditional cellular networks are facing enormous challenges, such as the scarcity of spectrum resources, the overload of base stations and the congestion of communication links, which greatly limits the development of future networks. As a result, D 2 D D D / V / D / D / D / D / D / D / D / D / D / V / V / D / D / D / D / D / D / D / As one of the key technologies in the next generation wireless communication, D2D communication has great advantages in reducing the burden of cellular network, improving energy efficiency, expanding the communication range and increasing the transmission rate. In addition, users of handheld mobile communication devices will spontaneously form a relatively stable mobile social network model with some complex network rules. Therefore, this paper combines social network with D2D communication, considers the network topology between users, and studies D2D communication technology from the point of view of social network. The work is as follows: (1) the characteristics of several key technologies in D2D communication are compared and analyzed, and the advantages and disadvantages of D2D communication compared with traditional cellular communication, traditional point-to-point communication are summarized. At the same time, the network theory and its mathematical expression used in this paper are briefly introduced, and the characteristics of social network are expounded, which will lay the foundation for the theoretical study of D2D user discovery technology based on social relations. As the first step in the establishment of D2D communication, it aims to effectively identify potential neighbor users. The existing user discovery strategy has some limitations, such as slow discovery speed, unsafe and so on. To solve this problem, this paper studies the on-demand user discovery strategy based on social relations. According to the distribution characteristics of user request and cache file and the updated user social relation of base station, the neighbor user set is discovered. In addition, the reputation of the user in the system is considered to avoid malice and attack the node. Theoretical analysis and simulation results show that the proposed strategy can find neighbor users more effectively, and improve the security of D2D link establishment.) the mechanism of D2D file sharing based on social network is studied. The existing D2D file sharing research does not fully consider the social status of users, the system sharing files single, ignoring user trust, and so on. In order to solve this problem, this paper analyzes the file sharing mechanism based on social network with the help of cellular network. According to the needs of users, the mechanism divides users into temporary groups, and considers the user's social status, trust degree and utility function between user nodes in order to select D2D communication or cellular communication mode. Target files are preferred to be shared in D-2 D communication mode. In addition, in order to avoid user self-interference, D2D users can only process (receive or send) one request at the same time. In order to solve this problem, a multi-round loop strategy is adopted in this paper. The theoretical research and simulation results show that selecting the users with the largest degree of social networking as the shared file of the central user can greatly reduce the transmission delay, reduce the load of the base station, and optimize the overall performance of the cellular communication system. The research work in this paper is of great theoretical significance and practical value in solving the bottleneck problem of increasing shortage of wireless resources and ensuring the security of file transmission.
【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;TP393.09

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