本文選題：異構蜂窩網絡　切入點：蜂窩直通通信　出處：《電子科技大學》2017年博士論文　論文類型：學位論文

【摘要】：為了應對移動互聯業(yè)務的爆發(fā)式增長,同時為用戶提供無縫式網絡覆蓋,第三代伙伴合作計劃組織在LTE-Aadvance標準中提出了異構蜂窩網絡技術,通過在傳統(tǒng)宏蜂窩小區(qū)中重疊布置低功率小型基站來提升系統(tǒng)的整體性能。與傳統(tǒng)同構蜂窩網絡相比,異構蜂窩網絡能夠有效改善系統(tǒng)的頻譜效率和覆蓋范圍。一方面,小小區(qū)通過與宏小區(qū)共享傳輸頻段,增加了頻譜空間使用率,從而提高了系統(tǒng)的頻譜效率。另一方面,小型基站一般被布置在宏基站信號較弱的區(qū)域或者通信熱點區(qū)域,因而能有效改善宏小區(qū)的無線覆蓋,為用戶提供泛在的接入服務。隨著對異構蜂窩網絡研究的不斷深入,如何進一步提高系統(tǒng)容量、擴大網絡覆蓋、降低能量消耗成為異構蜂窩網絡研究中所需要面對的新問題�？紤]到蜂窩直通(Device-to-Device,D2D)通信和全雙工通信技術在提升傳輸頻譜效率和能量效率上的優(yōu)勢,將D2D通信和全雙工通信技術引入異構蜂窩網絡,構建高頻譜效率、高能量效率的無線傳輸系統(tǒng)已成為當前的研究熱點。然而D2D通信和全雙工通信的引入也會給異構蜂窩網絡的資源分配帶來挑戰(zhàn)。因此,本文致力于基于D2D和全雙工通信的異構蜂窩網絡資源分配研究,通過解決用戶接入、發(fā)射功率控制、傳輸頻段選擇以及信令開銷等問題,來提升系統(tǒng)的頻譜效率和能量效率。主要研究內容有下面四個部分:(1)基于單D2D中繼的異構蜂窩用戶接入;(2)基于多D2D中繼的異構蜂窩用戶接入;(3)正交頻譜共享下全雙工通信的異構蜂窩網絡資源分配;(4)非正交頻譜共享下全雙工通信的異構蜂窩網絡資源分配。第一部分針對單D2D中繼的場景,研究了異構蜂窩用戶聯合接入控制與資源分配問題,提出了一種基于跨層設計的用戶接入算法來優(yōu)化系統(tǒng)上行傳輸頻譜效率和能量效率。該算法分為接入點選擇、發(fā)射功率控制和傳輸模式切換三個步驟。每一步都簡單易行,并且能夠得到相關優(yōu)化問題最優(yōu)解的閉合表達式。仿真結果表明所提出的算法大大能提升小區(qū)邊緣用戶上行傳輸的性能,同時還顯示在面向頻譜效率和能量效率的傳輸中,基于D2D中繼的傳輸模式比直傳模式能給用戶帶來更多的性能增益。此外,仿真結果還展示了所提出算法在頻譜效率和能量效率上的折中關系。第二部分研究了多D2D中繼場景下的異構蜂窩用戶接入問題。由于D2D中繼和小型基站的分布具有隨機性,系統(tǒng)中信道狀態(tài)的測量會引起大量的信令開銷。當D2D中繼數目較多時,這種信令開銷變得更加可觀。因此,在多D2D中繼場景下,如何設計高效用戶接入算法來降低信令開銷值得進一步研究。為了解決這個問題,本文提出了基于位置信息的用戶接入算法來平衡信令開銷與用戶傳輸性能之間的關系。該算法首先從理論上分析最優(yōu)中繼節(jié)點的位置,然后根據D2D中繼與最優(yōu)中繼位置之間的相對關系來進行中繼節(jié)點的選擇。最后根據選定的中繼節(jié)點來確定最優(yōu)的發(fā)射功率與傳輸模式。仿真結果證明所提出的算法在提升異構蜂窩用戶上行傳輸能量效率的同時,還能有效降低系統(tǒng)的計算開銷與信令開銷。第三部分研究了正交頻譜共享場景下全雙工通信的異構蜂窩網絡資源分配問題。綜合考慮基站和用戶的發(fā)射功率限制,以最大化小小區(qū)容量為目標,構建了聯合上下行用戶子載波分配和發(fā)射功率控制的優(yōu)化問題,并采用拉格朗日對偶的理論將該問題分解為一個原始優(yōu)化問題和一個對偶優(yōu)化問題。由于原始優(yōu)化問題具有非凸結構,因而可以采用凸凹過程(Concave-Convex Procedure,CCCP)把該問題轉化為一系列凸問題進行求解。通過共軛次梯度法,對偶優(yōu)化問題可以得到有效解決。通過理論分析和仿真驗證驗證,基于拉格朗日對偶分解的資源分配算法能以較低的運算代價提升的系統(tǒng)容量。第四部分研究了非正交頻譜共享場景下全雙工通信的異構蜂窩網絡資源分配問題。與正交頻譜共享場景不同,在非正交頻譜共享場景下,小小區(qū)和宏小區(qū)之間存在跨層干擾,因此在優(yōu)化小小區(qū)容量的同時還需要限制其對宏小區(qū)的跨層干擾。此外,由于小型基站的位置具有隨機性,宏基站可能無法準確獲得跨層干擾的準確信息。因此,本文考慮了信道測量誤差的影響,并根據魯棒優(yōu)化理論構建了聯合上下行用戶子載波分配和發(fā)射功率控制的優(yōu)化問題。與正交頻譜共享的場景類似,利用拉格朗日對偶分解,該優(yōu)化問題被等效化簡為一個原始優(yōu)化問題和一個對偶優(yōu)化問題。對于非凸原始優(yōu)化問題,采用CCCP順序求解。而對于具有凸結構的對偶問題,則采用共軛次梯度法進行求解。仿真結果證明了所提出算法的有效性,同時還分析了不同誤差模型對算法性能的影響。
[Abstract]:In order to cope with the explosive growth of mobile Internet business, and to provide users with seamless network coverage, third generation partnership project organization proposed heterogeneous cellular network technology in the LTE-Aadvance standard, through the arrangement of low power small base overlap in traditional macrocellular to enhance the overall performance of the system. Compared with the traditional homogeneous heterogeneous cellular network the cellular network can effectively improve the system spectrum efficiency and coverage. On the one hand, a small community by sharing the transmission band and the macro cell, increase the spectrum usage rate of space, so as to improve the spectrum efficiency of the system. On the other hand, the small base station is generally arranged in the Acer station area or weak signal communication hotspots, wireless coverage it can effectively improve the macro cell, provide access to services in the pan for users. With the study of heterogeneous cellular network deeply, how to To further improve the system capacity, expanding network coverage and reduce energy consumption has become a new problem to study heterogeneous cellular networks. Considering the direct cellular (Device-to-Device, D2D) and full duplex communication communication technology to enhance transmission spectrum efficiency and energy efficiency advantages, the technology of D2D communication and full duplex communication into heterogeneous cellular network construction, high spectral efficiency, high energy efficiency of wireless transmission system has become a research hotspot. However, the introduction of D2D communication and full duplex communication will also bring challenges to the resource allocation for heterogeneous cellular networks. Therefore, this paper is devoted to the study of cyber source heterogeneous cellular distribution of D2D and full duplex communication based on the solution to the user access control, transmission power, transmission frequency selection and signaling overhead and other issues, to enhance the spectral efficiency and the energy efficiency of the system. The main research contents The following four parts: (1) heterogeneous cellular D2D relay based on single user access; (2) heterogeneous cellular users access D2D based on relay; (3) sharing cyber source heterogeneous cellular distribution under the full duplex orthogonal frequency spectrum; (4) sharing cyber source heterogeneous cellular distribution under the full duplex communication of non the first part of the scene. The orthogonal spectrum for single D2D relay, to study the heterogeneous cellular users joint access control and resource allocation problem, proposes an access algorithm based on cross layer design to optimize the system uplink transmission spectrum efficiency and energy efficiency. The choice for the access point of the algorithm, transmission power control and transmission mode switching three steps. Each step is simple and feasible, and can obtain a closed expression optimization problem. Simulation results show that the proposed algorithm can greatly improve the cell edge user uplink transmission, the same Also shown in the transmission for spectrum efficiency and energy efficiency, based on the transmission mode of D2D relay than direct mode can bring more performance gain to users. In addition, the simulation results also show the proposed tradeoff algorithm in spectrum efficiency and energy efficiency. The second part studies the problem of heterogeneous cellular user access multi D2D relay. Due to the distribution of D2D relay and small base station is random, the channel state measurement system will cause a large amount of signaling overhead. When the D2D relay number is large, the signaling overhead becomes more considerable. Because of this, the D2D relay, how to design a more efficient algorithm to reduce user access the signaling overhead is worth further study. In order to solve this problem, this paper proposes the user access algorithm based on location information to balance the relationship between the signaling overhead and transmission performance of the user. Firstly, analysis of the optimal relay node position in theory, and then to the relay node according to the relative relationship between the D2D and the optimal relay relay location choice. According to the selected relay node to determine the optimal transmit power and transmission mode. The simulation results prove that the proposed algorithm also enhance cellular user uplink transmission energy efficiency heterogeneous, can effectively reduce the computational overhead and the signaling overhead of the system. The third part studies the orthogonal spectrum of full duplex communication in heterogeneous cellular cyber source allocation problem sharing scenarios. Considering the transmission power of the base station and user constraints, to maximize the small cell capacity as the goal, constructing the downlink user Zi Zaibo distribution and transmission power control the optimization problem, and using Lagrange duality theory decomposes the problem into an optimization problem and one of the original I optimization problem. Because the original optimization problem is non convex and concave structure, can be used to process (Concave-Convex Procedure CCCP) the problem is transformed into a series of convex problem is solved by the conjugate gradient method. Second, the dual optimization problem can be solved effectively. Through theoretical analysis and simulation verification, system capacity and resource allocation algorithm Lagrange dual decomposition at low computational cost. Based on the improvement of the fourth part of the non orthogonal frequency full duplex communication of heterogeneous cellular cyber source allocation problem sharing scenarios. Sharing and orthogonal spectrum of different scenes, sharing in the non orthogonal spectrum scenario, existing cross layer interference between the macrocell and so on. Optimization of small cell capacity also need to limit the macro cell cross layer interference. In addition, due to the small base station location is random, the macro base station Can not accurately obtain accurate information of cross layer interference. Therefore, considering the effect of channel measurement error, and according to the theories of robust optimization is constructed combined with the user downlink subcarrier allocation and power control optimization problem. The orthogonal spectrum sharing and scene similar, using Lagrange dual decomposition, the optimization problem is equivalent Jane is one of the original optimization problem and a dual optimization problem for non convex optimization problems. The original, using CCCP order solution. For the dual problem with convex structure, the conjugate gradient method is used to solve the problem. The simulation results prove the effectiveness of the proposed algorithm, and the effect of different errors on the performance of the algorithm model the analysis.

【學位授予單位】：電子科技大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TN929.5

【相似文獻】

相關期刊論文 前10條

1 沈建苗;無線LAN:蜂窩網絡的終結者?[J];互聯網周刊;2001年29期

2 馬忠建,方旭明,傲丹;虛擬蜂窩網技術的研究與發(fā)展[J];數據通信;2004年06期

3 劉濤;戎蒙恬;史宏逵;;中繼蜂窩網絡中小區(qū)間和小區(qū)內的資源分割[J];信息安全與通信保密;2007年03期

4 ;MIMO[J];電子質量;2008年09期

5 李卓暉;龍芳;黃進永;;計算機輔助蜂窩網性能與可靠性優(yōu)化設計[J];廣東通信技術;2010年05期

6 李云;朱雪;廖超;;蜂窩網絡中能效最大的最優(yōu)中繼位置研究[J];重慶郵電大學學報(自然科學版);2014年01期

7 倪銳;周武e，

本文編號：1575169