【摘要】：蜂窩系統(tǒng)中的D2D通信能夠提高小區(qū)容量、降低終端用戶和基站的能量損耗、提高系統(tǒng)的頻譜利用率、減輕蜂窩基站的負(fù)擔(dān),能夠在一定程度上緩解頻譜資源短缺的問題。然而,D2D用戶通過復(fù)用蜂窩網(wǎng)絡(luò)的頻譜資源來傳輸數(shù)據(jù),不可避免地會造成蜂窩用戶與D2D用戶之間的干擾。因此,如何協(xié)調(diào)好蜂窩用戶與D2D用戶之間的資源以減少干擾是蜂窩異構(gòu)網(wǎng)絡(luò)的關(guān)鍵問題之一。本文主要研究了蜂窩網(wǎng)絡(luò)系統(tǒng)中D2D通信的資源分配問題,分析了干擾產(chǎn)生的原因,同時(shí)提出干擾管理算法。具體內(nèi)容如下:(1)為了提高用戶選擇D2D通信模式的概率,需要對D2D用戶的發(fā)送功率進(jìn)行優(yōu)化,以保證可靠的D2D傳輸以及蜂窩用戶的鏈路質(zhì)量。本文提出了一種基于D2D用戶功率優(yōu)化的通信模式選擇方法,該方法根據(jù)D2D用戶和蜂窩用戶與基站之間的距離比值分析用戶采用D2D通信模式的條件,并通過優(yōu)化用戶的發(fā)送功率提高用戶選擇D2D通信模式的概率。仿真結(jié)果驗(yàn)證了用戶采用D2D模式通信的條件,通過功率優(yōu)化提高了用戶選擇D2D通信模式的概率。(2)提出了一種基于QoS的信道分配和功率控制算法。該算法首先根據(jù)D2D用戶的最小SINR要求,得到D2D用戶的候選蜂窩用戶集;然后,在用戶的QoS和發(fā)送功率受限條件下,構(gòu)建了最大化D2D用戶容量的目標(biāo)函數(shù)。最后采用拉格朗日乘子法求解蜂窩用戶和D2D用戶的最優(yōu)發(fā)送功率,根據(jù)最優(yōu)功率計(jì)算D2D用戶容量并將信道分配給容量值最大的D2D用戶。然而該算法的復(fù)雜度較大,于是又提出了一種分階段信道分配和功率控制的次優(yōu)化算法。仿真結(jié)果表明,本文算法能夠提高D2D用戶容量,次優(yōu)化算法具有近似最優(yōu)化算法性能的同時(shí)也大大地降低了復(fù)雜度。(3)提出了一種基于能效的子載波分配和功率控制算法。在保證用戶的QoS以及D2D用戶最大發(fā)送功率約束條件下,最大化不同通信模式的D2D用戶的能量效率。假設(shè)D2D用戶能夠選擇采用模式A(直接通信)或模式B(經(jīng)中繼轉(zhuǎn)發(fā)通信)進(jìn)行通信。根據(jù)D2D用戶及被其復(fù)用子載波的活躍蜂窩用戶的中斷概率與預(yù)設(shè)門限的關(guān)系,為D2D用戶選擇不同的通信模式,采用匈牙利算法為D2D用戶分配子載波,采用二分算法優(yōu)化D2D用戶的發(fā)送功率。仿真結(jié)果表明,該算法在D2D用戶容量與能量效率方面的性能更優(yōu)。
[Abstract]:D2D communication in cellular system can improve the cell capacity, reduce the energy loss of end users and base stations, improve the spectrum efficiency of the system, reduce the burden of cellular base stations, and alleviate the shortage of spectrum resources to a certain extent. However, D2D users transmit data by multiplexing spectrum resources of cellular networks, which inevitably results in interference between cellular users and D2D users. Therefore, how to coordinate the resources between cellular users and D2D users to reduce interference is one of the key problems in cellular heterogeneous networks. In this paper, the resource allocation problem of D2D communication in cellular network system is studied, the reason of interference is analyzed, and an interference management algorithm is proposed. The main contents are as follows: (1) in order to improve the probability of users choosing D2D communication mode, it is necessary to optimize the transmission power of D2D users to ensure reliable D2D transmission and the link quality of cellular users. A communication mode selection method based on D2D user power optimization is proposed in this paper. According to the distance ratio between D2D user and cellular user and base station, the condition of D2D communication mode is analyzed. The probability of selecting D2D communication mode is improved by optimizing the transmission power of the user. The simulation results verify the communication conditions of users using D2D mode and improve the probability of users choosing D2D communication modes through power optimization. (2) A channel allocation and power control algorithm based on QoS is proposed. Firstly, according to the minimum SINR requirement of D2D users, the candidate cellular user set of D2D users is obtained, and then the objective function to maximize the capacity of D2D users is constructed under the condition of the user's QoS and transmission power constraints. Finally, the Lagrange multiplier method is used to solve the optimal transmission power of the cellular and D2D users. The D2D user capacity is calculated according to the optimal power and the channel is assigned to the D2D user with the largest capacity. However, the complexity of the algorithm is high, so a sub-optimization algorithm for channel allocation and power control is proposed. The simulation results show that the proposed algorithm can improve the D2D user capacity, and the sub-optimization algorithm has the performance of approximate optimization and greatly reduces the complexity. (3) A subcarrier allocation and power control algorithm based on energy efficiency is proposed. In order to maximize the energy efficiency of D2D users with different communication modes, the QoS of users and the maximum transmit power constraints of D2D users are guaranteed. Suppose D2D users can choose mode A (direct communication) or mode B (relay forward communication) to communicate. According to the relation between interrupt probability and preset threshold of D2D users and active cellular users multiplexed by them, different communication modes are selected for D2D users, and Hungarian algorithm is used to assign subcarriers to D2D users. The binary algorithm is used to optimize the transmission power of D2D users. Simulation results show that the proposed algorithm has better performance in D2D user capacity and energy efficiency.
【學(xué)位授予單位】：南京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 TANG Rui;ZHAO Jihong;QU Hua;;Joint Optimization of Channel Allocation,Link Assignment and Power Control for Device-to-Device Communication Underlaying Cellular Network[J];中國通信;2015年12期

2 王俊義;鞏志帥;符杰林;陳小徽;林基明;;D2D通信技術(shù)綜述[J];桂林電子科技大學(xué)學(xué)報(bào);2014年02期

3 童曉濤;楊謙;;WCDMA無線網(wǎng)絡(luò)規(guī)劃方法[J];電信工程技術(shù)與標(biāo)準(zhǔn)化;2009年12期

相關(guān)博士學(xué)位論文 前1條

1 程鵬;基于凸優(yōu)化理論的無線網(wǎng)絡(luò)跨層資源分配研究[D];浙江大學(xué);2008年

，

本文編號：2207909