在蜂窝网中应用D2D通信技术研究

发布时间：2018-01-25 20:12

本文关键词： D2D 资源分配效用图着色功率控制　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：智能手机、平板电脑等移动终端已经成为当今人们的生活必备,移动用户数据业务需求快速增大,但移动网络能够使用的带宽资源是有限的。要解决业务增长与资源受限的矛盾,就要不断发掘新的移动通信技术。其中一种有效的办法是在蜂窝网络中引入D2D(Device-to-Device)通信技术,即在地里位置上距离较近的移动设备可以直接进行通信,而不用遵循传统“设备-基站-设备”的通信模式。本论文主要研究在蜂窝网中应用D2D通信技术,提出一种基于图着色的D2D正交资源分配机制:蜂窝网络分配一个资源池给D2D通信,与原有蜂窝通信相互正交。资源池被分为若干子带资源,通常子带数小于D2D对数,多个D2D对可以复用同一子带资源,应用图论中的图着色理论完成D2D对之间的相互复用。基于图着色的结果,本文提出了一种基于效用的资源分配方法,子带资源大小与使用每一种颜色的D2D对数成正比,即复用同一种颜色的D2D对数越多,分配的资源就越多。考虑到D2D通信的重要特点之一就是通信距离短、节省终端电池消耗,经过资源分配以后,对D2D对进行功率控制。在本文提出的正交资源分配机制下,依据构图方法不同,有三种可能的实现方案:基于接收功率方案:基站预先设定一个接收功率门限值Pr xG。两个D2D对映射到图G上的点之间的邻接性通过如下过程判断:D2Di发送探测信号,若D2Dj接收到的探测信号功率大于Pr xG,则基站认为当前D2Di对D2Dj干扰较大,图G中代表D2Di和D2Dj的两点邻接;反之,D2Di与D2Dj不邻接。基于SIR方案:基本思想是预先设定一个SIR门限值SIRG,首先假定所有D2D对都复用相同的资源。对于任意一个D2Di,依照其余D2D对用户对D2Di的干扰从强到弱的顺序不断剔除干扰项,直到()SIRSIR i3G为止,所有剔除项所对应的D2D对与D2Di互干扰较强,在图G中连通。基于效用方案:基于效用构图方案是一种遍历方案,可用最大颜色数为N,实际使用颜色数可以是从1到N,一共有N种可能。然后,每一次遍历循环都进行构图、着色和资源分配,并计算和效用。遍历N种可能的构图着色方案,找出使得系统和效用最大的一种方案。上述三种方案经过Matlab仿真,综合SINR、功效比以及算法复杂度性能分析得出结论:基于接收功率方案是最佳正交资源分配方案。最后为了验证本文提出的正交资源分配机制的有效性,给出一种复用模式方案,并通过仿真性能、信令开销等方面综合对比得出结论:本文提出的基于图着色的D2D正交资源分配机制在频谱利用率、系统能效、通信质量、信令开销以及引入D2D通信对蜂窝系统的影响等方面性能良好。
[Abstract]:Mobile terminals, such as smart phones and tablets, have become an essential part of people's lives, and the demand for mobile users' data services is increasing rapidly. However, the bandwidth resources that mobile networks can use are limited. The contradiction between service growth and resource constraints should be solved. New mobile communication technologies are to be discovered. One of the effective methods is to introduce D2DX Device-to-DeviceCommunication technology into cellular networks. That is, mobile devices which are close to the ground can communicate directly without following the traditional communication mode of "Equipment-Base-Equipments". This paper mainly studies the application of D2D communication technology in cellular networks. A D2D orthogonal resource allocation mechanism based on graph coloring is proposed. The cellular network allocates a resource pool to D2D communication, which is orthogonal to the original cellular communication. The resource pool is divided into several sub-band resources. Usually, the number of subbands is less than the logarithm of D2D. Multiple D2D pairs can reuse the same subband resource. The graph coloring theory in graph theory is applied to accomplish the mutual reuse of D2D pairs. The results of graph coloring are based on the results of graph coloring. A resource allocation method based on utility is proposed in this paper. The resource size of subband is directly proportional to the D2D logarithm of each color, that is, the more D2D logarithms of the same color are reused. Considering that one of the important characteristics of D2D communication is short communication distance, saving terminal battery consumption, after resource allocation. Under the orthogonal resource allocation mechanism proposed in this paper, the power control of D2D pair is different according to the composition method. There are three possible implementations: based on the received power scheme: the base station presets a received power threshold pr xG. The adjacency of two D2D pairs to the points mapped to the graph G is determined by the following process:. D2Di sends a probe signal. If the power of the detected signal received by D2Dj is greater than that of pr xG, then the base station thinks that the current D2Dj is more interfered with D2Dj, and the two points adjacent to D2Di and D2Dj are represented in figure G. On the contrary, D2Di and D2Dj are not adjacent. Based on SIR scheme: the basic idea is to set a SIR threshold SIRG in advance. It is assumed that all D2D pairs are reused with the same resources. For any D2Dis, interference with D2Di by the user is continuously removed from strong to weak order according to the rest of D2D interference to D2Di. Up to SIRSIR I 3G, the D2D pairs corresponding to all the knockout terms have strong interference with D2Di. Utility based scheme: Utility based composition scheme is a traversal scheme, the maximum number of colors available is N, and the actual number of colors can be from 1 to N. there are N possibilities. Each ergodic cycle performs composition coloring and resource allocation calculation and utility. It traverses N possible composition coloring schemes. Find out a scheme that makes the system and utility the most effective. The above three schemes are simulated by Matlab and integrated with SINR. The efficiency ratio and complexity performance of the algorithm are analyzed. The conclusion is that the received power scheme is the best orthogonal resource allocation scheme. Finally, to verify the effectiveness of the orthogonal resource allocation mechanism proposed in this paper. A scheme of multiplexing mode is presented and compared with simulation performance and signaling overhead. The conclusions are as follows: the proposed D2D orthogonal resource allocation mechanism based on graph coloring is efficient in spectrum efficiency and system energy efficiency. Communication quality, signaling overhead and the effect of D2D communication on cellular systems are good.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

【共引文献】