本文關鍵詞： D2D 資源分配 效用 圖著色 功率控制　出處：《電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：智能手機、平板電腦等移動終端已經(jīng)成為當今人們的生活必備,移動用戶數(shù)據(jù)業(yè)務需求快速增大,但移動網(wǎng)絡能夠使用的帶寬資源是有限的。要解決業(yè)務增長與資源受限的矛盾,就要不斷發(fā)掘新的移動通信技術。其中一種有效的辦法是在蜂窩網(wǎng)絡中引入D2D(Device-to-Device)通信技術,即在地里位置上距離較近的移動設備可以直接進行通信,而不用遵循傳統(tǒng)“設備-基站-設備”的通信模式。本論文主要研究在蜂窩網(wǎng)中應用D2D通信技術,提出一種基于圖著色的D2D正交資源分配機制:蜂窩網(wǎng)絡分配一個資源池給D2D通信,與原有蜂窩通信相互正交。資源池被分為若干子帶資源,通常子帶數(shù)小于D2D對數(shù),多個D2D對可以復用同一子帶資源,應用圖論中的圖著色理論完成D2D對之間的相互復用。基于圖著色的結果,本文提出了一種基于效用的資源分配方法,子帶資源大小與使用每一種顏色的D2D對數(shù)成正比,即復用同一種顏色的D2D對數(shù)越多,分配的資源就越多。考慮到D2D通信的重要特點之一就是通信距離短、節(jié)省終端電池消耗,經(jīng)過資源分配以后,對D2D對進行功率控制。在本文提出的正交資源分配機制下,依據(jù)構圖方法不同,有三種可能的實現(xiàn)方案:基于接收功率方案:基站預先設定一個接收功率門限值Pr xG。兩個D2D對映射到圖G上的點之間的鄰接性通過如下過程判斷:D2Di發(fā)送探測信號,若D2Dj接收到的探測信號功率大于Pr xG,則基站認為當前D2Di對D2Dj干擾較大,圖G中代表D2Di和D2Dj的兩點鄰接;反之,D2Di與D2Dj不鄰接。基于SIR方案:基本思想是預先設定一個SIR門限值SIRG,首先假定所有D2D對都復用相同的資源。對于任意一個D2Di,依照其余D2D對用戶對D2Di的干擾從強到弱的順序不斷剔除干擾項,直到()SIRSIR i3G為止,所有剔除項所對應的D2D對與D2Di互干擾較強,在圖G中連通�；谛в梅桨�:基于效用構圖方案是一種遍歷方案,可用最大顏色數(shù)為N,實際使用顏色數(shù)可以是從1到N,一共有N種可能。然后,每一次遍歷循環(huán)都進行構圖、著色和資源分配,并計算和效用。遍歷N種可能的構圖著色方案,找出使得系統(tǒng)和效用最大的一種方案。上述三種方案經(jīng)過Matlab仿真,綜合SINR、功效比以及算法復雜度性能分析得出結論:基于接收功率方案是最佳正交資源分配方案。最后為了驗證本文提出的正交資源分配機制的有效性,給出一種復用模式方案,并通過仿真性能、信令開銷等方面綜合對比得出結論:本文提出的基于圖著色的D2D正交資源分配機制在頻譜利用率、系統(tǒng)能效、通信質(zhì)量、信令開銷以及引入D2D通信對蜂窩系統(tǒng)的影響等方面性能良好。
[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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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本文編號：1463603