本文選題：D2D + 用戶發(fā)現(xiàn)�。� 參考：《南京郵電大學(xué)》2016年碩士論文

【摘要】：隨著移動業(yè)務(wù)的爆炸性增長,傳統(tǒng)蜂窩網(wǎng)絡(luò)面臨著巨大挑戰(zhàn),如頻譜資源稀缺、基站超負載工作以及通信鏈路擁擠等,極大限制了未來網(wǎng)絡(luò)的發(fā)展。由此,允許終端之間通過復(fù)用小區(qū)資源直接進行通信的D2D(Device-to-Device)技術(shù)運用而生。作為下一代無線通信研究的關(guān)鍵技術(shù)之一,D2D通信在減輕蜂窩網(wǎng)絡(luò)負擔(dān)、提升能量效率、擴大通信范圍以及提高傳輸速率等方面具有巨大優(yōu)勢。此外,手持移動通信設(shè)備的用戶會自發(fā)形成相對穩(wěn)定、具有一定復(fù)雜網(wǎng)絡(luò)規(guī)律的移動社交網(wǎng)絡(luò)模型。因此,本文將社交網(wǎng)絡(luò)與D2D通信有機結(jié)合,考慮用戶之間的網(wǎng)絡(luò)拓撲,從社交網(wǎng)絡(luò)的角度研究D2D通信技術(shù)。所完成的工作包括如下內(nèi)容:(1)對比分析了D2D通信中幾種關(guān)鍵技術(shù)的特點,總結(jié)D2D通信與傳統(tǒng)蜂窩通信、傳統(tǒng)近距離點對點通信相比存在的優(yōu)劣勢。同時,簡要介紹了本文所用到的網(wǎng)絡(luò)理論及其數(shù)學(xué)表達,并闡述社交網(wǎng)絡(luò)的特點,為后文的理論研究奠定基礎(chǔ)。(2)研究基于社交關(guān)系的D2D用戶發(fā)現(xiàn)技術(shù)。作為D2D通信建立的第一步,其旨在有效發(fā)現(xiàn)潛在的鄰居用戶。現(xiàn)有的用戶發(fā)現(xiàn)策略存在發(fā)現(xiàn)速度慢、不安全等局限性。針對此問題,本文研究了基于社交關(guān)系的按需用戶發(fā)現(xiàn)策略。根據(jù)用戶請求和緩存文件的分布特性以及基站反饋更新的用戶社交關(guān)系來發(fā)現(xiàn)鄰居用戶集。此外,本文還考慮了用戶在系統(tǒng)中的信譽來避免惡意、攻擊節(jié)點的破壞行為。理論分析及仿真結(jié)果表明,該策略可以更有效地發(fā)現(xiàn)鄰居用戶,提升D2D鏈路建立的安全性。(3)研究基于社交網(wǎng)絡(luò)的D2D文件共享機制�，F(xiàn)有的D2D文件共享研究存在未充分考慮用戶的社交狀態(tài)、系統(tǒng)共享文件單一、忽略用戶信任度等問題。針對此問題,本文分析蜂窩網(wǎng)協(xié)助下基于社交網(wǎng)絡(luò)的文件共享機制。該機制根據(jù)用戶的需求,將用戶劃分為若干臨時小組,在組內(nèi)充分考慮用戶的社交狀態(tài)、信任度以及用戶節(jié)點間的效用函數(shù)來選取D2D通信或者蜂窩通信模式,目標文件優(yōu)先選擇D2D通信模式共享。此外,為了避免用戶的自我干擾,D2D用戶在同一時間僅能處理(接收或發(fā)送)一個請求,為了解決此問題,本文采用多輪循環(huán)策略。理論研究和仿真結(jié)果表明,選擇社交網(wǎng)絡(luò)中具有最大社交度的用戶作為中央用戶共享文件,可大大降低傳輸時延、減輕基站負載、優(yōu)化蜂窩通信系統(tǒng)的整體性能。本文研究工作在解決無線資源日趨緊缺的瓶頸問題以及確保文件傳輸?shù)陌踩苑矫婢哂惺种匾睦碚撘饬x和實用價值。
[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.
【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】：2016
【分類號】：TN929.5;TP393.09

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