【摘要】：互聯(lián)網(wǎng)、云計算等網(wǎng)絡技術(shù)極大地豐富了人們的生活,成為很多人必不可少的日常需求。大規(guī)模集成電路的發(fā)展使得手持移動終端強大到能夠承載各種網(wǎng)絡應用�；ヂ�(lián)網(wǎng)也從面向個人電腦往面向移動終端發(fā)展,由此而生的“移動互聯(lián)網(wǎng)”成為當下的熱潮。作為移動互聯(lián)網(wǎng)的主要網(wǎng)絡載體,蜂窩網(wǎng)承載的數(shù)據(jù)已從傳統(tǒng)的語音和文本等簡單格式,發(fā)展為視頻、語音和文本等多種類型的復雜多媒體格式。這對于蜂窩網(wǎng)絡的設計是極大的挑戰(zhàn)。用戶對于無線通信帶寬需求的不斷增長和蜂窩網(wǎng)絡有限的無線資源供應成為主要的矛盾。如何提高有限頻譜的利用率是蜂窩網(wǎng)絡演進的重要方向。提高頻譜的空間復用是近幾年來峰窩網(wǎng)絡研究的重點。其中,D2D通信(Device-to-Device communication)技術(shù)利用通信嘆方的近距離特性,通過復用無線資源的方式提高了頻譜的空間復用,成為近年來研究的熱點。 本文首先研究了D2D通信在同構(gòu)網(wǎng)絡下的干擾協(xié)調(diào)問題。雖然D2D通信復用蜂窩用戶的無線資源必然會對蜂窩用戶造成同頻干擾,但由于D2D通信雙方之間的距離較近,所需要的發(fā)送功率相對較低,因此,合理地分配D2D用戶的復用資源并控制其發(fā)送功率可以在保證一定的用戶服務質(zhì)量(Quality of Service,QoS)的條件下提高頻譜效率。針對同構(gòu)網(wǎng)絡下的D2D干擾協(xié)調(diào)問題,本文首先提出了一種基于部分位置信息的功率控制和信道分配方法。我們以中斷概率來表征用戶QoS,在D2D用戶周圍規(guī)劃出一個干擾受限區(qū)域。系統(tǒng)為D2D用戶分配干擾受限區(qū)域外的蜂窩用戶的信道,使得用戶中斷概率低于門限。所提的方法對信息需求少,僅需用戶距離基站的一維距離信息,計算復雜度低。其次,我們對上述思想進行進一步改進,并將改進后的思想應用到多小區(qū)蜂窩網(wǎng)絡下的D2D干擾協(xié)調(diào),提出了可接入?yún)^(qū)和可復用區(qū)的概念,為多小區(qū)下的D2D通信提供了一種信息需求少、復雜度低的功率控制和信道分配策略來協(xié)調(diào)干擾。 其次,本文研究了D2D通信在異構(gòu)蜂窩網(wǎng)絡下的資源優(yōu)化問題。異構(gòu)網(wǎng)絡指宏蜂窩與小蜂窩共存的蜂窩網(wǎng)絡。小蜂窩技術(shù)是另一項利用用戶的近距離特性實現(xiàn)無線資源空間復用的技術(shù)。低功率的小型蜂窩接入點或者叫小基站可以被用戶或者運營商部署在熱點或者宏基站覆蓋盲區(qū),形成小范圍的蜂窩網(wǎng)絡為用戶提供接入服務。小蜂窩技術(shù)是另一項蜂窩網(wǎng)絡研究的熱點,未來的網(wǎng)絡架構(gòu)也很可能成為宏蜂窩與小蜂窩異構(gòu)網(wǎng)絡。在這樣的背景下,我們考慮D2D通信在異構(gòu)網(wǎng)絡中的資源優(yōu)化問題。首先,我們研究了D2D通信在異構(gòu)網(wǎng)絡下的模式選擇問題。我們提出了兩種新的D2D通信模式,因此在異構(gòu)網(wǎng)絡中D2D通信具有五種可選模式,分別為復用宏蜂窩信道模式、復用小蜂窩信道模式、專用模式、宏蜂窩模式和小蜂窩模式。同時,我們對基于系統(tǒng)能量效率的模式選擇問題進行建模分析。其次,我們考慮了D2D通信作為中繼技術(shù)的資源優(yōu)化問題。D2D通信實現(xiàn)了蜂窩終端間的直連通信,因此未來的蜂窩終端可以作為中繼,幫助小蜂窩覆蓋范圍外的用戶接入到小基站。對于處于宏蜂窩邊緣而距離小基站較近但又不在其覆蓋范圍內(nèi)的用戶來講,D2D中繼可以有效提高用戶體驗。我們以QoS保障條件下的用戶功耗最低為資源優(yōu)化目標,設計了聯(lián)合的中繼選擇、功率控制、接入模式選擇和信道分配算法。
[Abstract]:Internet, cloud computing and other network technologies have greatly enriched people's lives and become an indispensable daily needs of many people. The development of large-scale integrated circuits makes handheld mobile terminals powerful enough to carry a variety of network applications. As the main network carrier of mobile internet, the data carried by cellular network has developed from traditional simple formats such as voice and text to various complex multimedia formats such as video, voice and text. This is a great challenge to the design of cellular network. How to improve the utilization of the limited spectrum is an important direction for the evolution of cellular networks. How to improve the spatial reuse of the spectrum is the focus of peak-to-nest network research in recent years. Among them, D2D (Device-to-Device Communication) technology utilizes the proximity of the communication sigh. Range property, which improves spatial multiplexing of spectrum by multiplexing wireless resources, has become a research hotspot in recent years.
In this paper, the interference coordination problem of D2D communication in homogeneous networks is studied. Although the wireless resources of multiplexed cellular users in D2D communication will inevitably cause the same frequency interference to cellular users, the transmission power of D2D communication is relatively low because of the close distance between the two sides. Therefore, the multiplexed resources of D2D users are reasonably allocated and controlled. The transmission power can improve the spectrum efficiency under the condition of guaranteeing a certain quality of service (QoS). Aiming at the problem of D2D interference coordination in isomorphic networks, a power control and channel allocation method based on partial location information is proposed in this paper. The proposed method requires less information and requires only one-dimensional distance information from the base station. The computational complexity of the proposed method is low. Secondly, we further improve the above idea and propose a new method. The improved idea is applied to D2D interference coordination in multi-cell cellular networks. The concepts of accessible area and reusable area are proposed, which provide a power control and channel allocation strategy with less information requirement and low complexity for D2D communication in multi-cell networks to coordinate interference.
Secondly, this paper studies the resource optimization problem of D2D communication in heterogeneous cellular networks. Heterogeneous networks refer to cellular networks in which macro cells and small cells coexist. In this context, we consider that D2D communication is in heterogeneous networks. Small cell technology is another hot topic of cellular network research, and the future network architecture may also become a heterogeneous network of macro cell and small cell. Firstly, we study the mode selection problem of D2D communication in heterogeneous networks. We propose two new D2D communication modes. Therefore, there are five alternative modes for D2D communication in heterogeneous networks, namely, multiplexing Macro-cellular channel mode, multiplexing small cellular channel mode, dedicated mode, Macro-cellular mode and small cell mode. Secondly, we consider the resource optimization problem of D2D communication as a relay technology. D2D communication implements direct communication between cellular terminals, so future cellular terminals can be used as relays to help users outside the small cellular coverage area. Access to small base stations. D2D relay can effectively improve user experience for users who are near the edge of the macro cell but not within the coverage of the small base station. Allocation algorithm.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN92

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本文編號：2235551