發(fā)布時(shí)間：2018-03-06 14:11

  本文選題：異構(gòu)蜂窩網(wǎng)絡(luò)　切入點(diǎn)：蜂窩直通通信　出處：《電子科技大學(xué)》2017年博士論文　論文類(lèi)型：學(xué)位論文

【摘要】：為了應(yīng)對(duì)移動(dòng)互聯(lián)業(yè)務(wù)的爆發(fā)式增長(zhǎng),同時(shí)為用戶(hù)提供無(wú)縫式網(wǎng)絡(luò)覆蓋,第三代伙伴合作計(jì)劃組織在LTE-Aadvance標(biāo)準(zhǔn)中提出了異構(gòu)蜂窩網(wǎng)絡(luò)技術(shù),通過(guò)在傳統(tǒng)宏蜂窩小區(qū)中重疊布置低功率小型基站來(lái)提升系統(tǒng)的整體性能。與傳統(tǒng)同構(gòu)蜂窩網(wǎng)絡(luò)相比,異構(gòu)蜂窩網(wǎng)絡(luò)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(guò)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(hào)較弱的區(qū)域或者通信熱點(diǎn)區(qū)域,因而能有效改善宏小區(qū)的無(wú)線覆蓋,為用戶(hù)提供泛在的接入服務(wù)。隨著對(duì)異構(gòu)蜂窩網(wǎng)絡(luò)研究的不斷深入,如何進(jìn)一步提高系統(tǒng)容量、擴(kuò)大網(wǎng)絡(luò)覆蓋、降低能量消耗成為異構(gòu)蜂窩網(wǎng)絡(luò)研究中所需要面對(duì)的新問(wèn)題�？紤]到蜂窩直通(Device-to-Device,D2D)通信和全雙工通信技術(shù)在提升傳輸頻譜效率和能量效率上的優(yōu)勢(shì),將D2D通信和全雙工通信技術(shù)引入異構(gòu)蜂窩網(wǎng)絡(luò),構(gòu)建高頻譜效率、高能量效率的無(wú)線傳輸系統(tǒng)已成為當(dāng)前的研究熱點(diǎn)。然而D2D通信和全雙工通信的引入也會(huì)給異構(gòu)蜂窩網(wǎng)絡(luò)的資源分配帶來(lái)挑戰(zhàn)。因此,本文致力于基于D2D和全雙工通信的異構(gòu)蜂窩網(wǎng)絡(luò)資源分配研究,通過(guò)解決用戶(hù)接入、發(fā)射功率控制、傳輸頻段選擇以及信令開(kāi)銷(xiāo)等問(wèn)題,來(lái)提升系統(tǒng)的頻譜效率和能量效率。主要研究?jī)?nèi)容有下面四個(gè)部分:(1)基于單D2D中繼的異構(gòu)蜂窩用戶(hù)接入;(2)基于多D2D中繼的異構(gòu)蜂窩用戶(hù)接入;(3)正交頻譜共享下全雙工通信的異構(gòu)蜂窩網(wǎng)絡(luò)資源分配;(4)非正交頻譜共享下全雙工通信的異構(gòu)蜂窩網(wǎng)絡(luò)資源分配。第一部分針對(duì)單D2D中繼的場(chǎng)景,研究了異構(gòu)蜂窩用戶(hù)聯(lián)合接入控制與資源分配問(wèn)題,提出了一種基于跨層設(shè)計(jì)的用戶(hù)接入算法來(lái)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(diǎn)選擇、發(fā)射功率控制和傳輸模式切換三個(gè)步驟。每一步都簡(jiǎn)單易行,并且能夠得到相關(guān)優(yōu)化問(wèn)題最優(yōu)解的閉合表達(dá)式。仿真結(jié)果表明所提出的算法大大能提升小區(qū)邊緣用戶(hù)上行傳輸?shù)男阅?同時(shí)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(hù)帶來(lái)更多的性能增益。此外,仿真結(jié)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(guān)系。第二部分研究了多D2D中繼場(chǎng)景下的異構(gòu)蜂窩用戶(hù)接入問(wèn)題。由于D2D中繼和小型基站的分布具有隨機(jī)性,系統(tǒng)中信道狀態(tài)的測(cè)量會(huì)引起大量的信令開(kāi)銷(xiāo)。當(dāng)D2D中繼數(shù)目較多時(shí),這種信令開(kāi)銷(xiāo)變得更加可觀。因此,在多D2D中繼場(chǎng)景下,如何設(shè)計(jì)高效用戶(hù)接入算法來(lái)降低信令開(kāi)銷(xiāo)值得進(jìn)一步研究。為了解決這個(gè)問(wèn)題,本文提出了基于位置信息的用戶(hù)接入算法來(lái)平衡信令開(kāi)銷(xiāo)與用戶(hù)傳輸性能之間的關(guān)系。該算法首先從理論上分析最優(yōu)中繼節(jié)點(diǎn)的位置,然后根據(jù)D2D中繼與最優(yōu)中繼位置之間的相對(duì)關(guān)系來(lái)進(jìn)行中繼節(jié)點(diǎn)的選擇。最后根據(jù)選定的中繼節(jié)點(diǎn)來(lái)確定最優(yōu)的發(fā)射功率與傳輸模式。仿真結(jié)果證明所提出的算法在提升異構(gòu)蜂窩用戶(hù)上行傳輸能量效率的同時(shí),還能有效降低系統(tǒng)的計(jì)算開(kāi)銷(xiāo)與信令開(kāi)銷(xiāo)。第三部分研究了正交頻譜共享場(chǎng)景下全雙工通信的異構(gòu)蜂窩網(wǎng)絡(luò)資源分配問(wèn)題。綜合考慮基站和用戶(hù)的發(fā)射功率限制,以最大化小小區(qū)容量為目標(biāo),構(gòu)建了聯(lián)合上下行用戶(hù)子載波分配和發(fā)射功率控制的優(yōu)化問(wèn)題,并采用拉格朗日對(duì)偶的理論將該問(wèn)題分解為一個(gè)原始優(yōu)化問(wèn)題和一個(gè)對(duì)偶優(yōu)化問(wèn)題。由于原始優(yōu)化問(wèn)題具有非凸結(jié)構(gòu),因而可以采用凸凹過(guò)程(Concave-Convex Procedure,CCCP)把該問(wèn)題轉(zhuǎn)化為一系列凸問(wèn)題進(jìn)行求解。通過(guò)共軛次梯度法,對(duì)偶優(yōu)化問(wèn)題可以得到有效解決。通過(guò)理論分析和仿真驗(yàn)證驗(yàn)證,基于拉格朗日對(duì)偶分解的資源分配算法能以較低的運(yùn)算代價(jià)提升的系統(tǒng)容量。第四部分研究了非正交頻譜共享場(chǎng)景下全雙工通信的異構(gòu)蜂窩網(wǎng)絡(luò)資源分配問(wèn)題。與正交頻譜共享場(chǎng)景不同,在非正交頻譜共享場(chǎng)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(shí)還需要限制其對(duì)宏小區(qū)的跨層干擾。此外,由于小型基站的位置具有隨機(jī)性,宏基站可能無(wú)法準(zhǔn)確獲得跨層干擾的準(zhǔn)確信息。因此,本文考慮了信道測(cè)量誤差的影響,并根據(jù)魯棒優(yōu)化理論構(gòu)建了聯(lián)合上下行用戶(hù)子載波分配和發(fā)射功率控制的優(yōu)化問(wèn)題。與正交頻譜共享的場(chǎng)景類(lèi)似,利用拉格朗日對(duì)偶分解,該優(yōu)化問(wèn)題被等效化簡(jiǎn)為一個(gè)原始優(yōu)化問(wèn)題和一個(gè)對(duì)偶優(yōu)化問(wèn)題。對(duì)于非凸原始優(yōu)化問(wèn)題,采用CCCP順序求解。而對(duì)于具有凸結(jié)構(gòu)的對(duì)偶問(wèn)題,則采用共軛次梯度法進(jìn)行求解。仿真結(jié)果證明了所提出算法的有效性,同時(shí)還分析了不同誤差模型對(duì)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(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.5

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本文編號(hào)：1575169