本文選題：LTE + 通信模式選擇��； 參考：《電子科技大學(xué)》2016年碩士論文

【摘要】：隨著智能手機(jī)的普及,業(yè)務(wù)數(shù)據(jù)量也有了爆炸式的增長(zhǎng),對(duì)現(xiàn)有的LTE通信網(wǎng)絡(luò)提出了新的要求。另一方面,基于地理位置等類型的新型服務(wù)逐漸興起。新的業(yè)務(wù)類型,如車輛間通信也逐漸開始部署。為了應(yīng)對(duì)這些新的趨勢(shì),LTE R12版本也開始考慮在LTE蜂窩網(wǎng)中引入D2D直連通信解決方案,借此來為用戶設(shè)備提供較高的數(shù)據(jù)傳輸速率、低時(shí)延、較低的能量消耗。然而,要進(jìn)行D2D直連通信,相應(yīng)的資源分配與通信模式選擇是亟待解決的關(guān)鍵問題。本文提出了一種新的通信模式選擇方法以及一種新的D2D資源分配方法,并在NS3仿真平臺(tái)上對(duì)D2D直連通信系統(tǒng)仿真模型進(jìn)行了設(shè)計(jì)與實(shí)現(xiàn)。本文所提出的模式選擇方法綜合考慮了D2D直連通信鏈路的信道質(zhì)量以及蜂窩移動(dòng)通信資源和D2D直連通信資源的使用情況等因素,以求將有限的通信資源盡可能的分配給信道質(zhì)量較高的直連通信鏈路,進(jìn)而最大化系統(tǒng)的數(shù)據(jù)傳輸速率與頻譜利用率。在本文所提出的D2D資源分配方法中,原有的LTE蜂窩通信與新加入的D2D直連通信之間不進(jìn)行資源復(fù)用。LTE系統(tǒng)為D2D直連通信預(yù)留一部分資源,來供D2D直連通信使用,這些資源與LTE通信資源相互正交,因此D2D直連通信與蜂窩通信之間不存在干擾。本文所提的D2D資源分配方法,允許D2D直連通信鏈路間進(jìn)行資源復(fù)用。在進(jìn)行資源分配時(shí),以最大化頻譜效率為標(biāo)準(zhǔn),針對(duì)新的D2D直連通信鏈路,首先考慮復(fù)用已被分配的資源,如果無法復(fù)用已被分配的資源,再對(duì)其分配新的資源。另外,本論文所提的資源分配方法,允許一個(gè)UE同時(shí)存在多條D2D直連通信鏈路,且允許D2D直連通信與蜂窩通信同時(shí)存在。除此之外,本文基于NS3仿真平臺(tái)的LTE模塊,對(duì)D2D直連通信系統(tǒng)仿真模型進(jìn)行了設(shè)計(jì)與實(shí)現(xiàn)。在本文實(shí)現(xiàn)的D2D直連通信系統(tǒng)仿真模型基礎(chǔ)之上,對(duì)本文所提出的D2D模式選擇方法和資源分配方法進(jìn)行了仿真,仿真結(jié)果展示了不同參數(shù)配置下的小區(qū)通信性能。仿真結(jié)果表明,在LTE蜂窩網(wǎng)中加入D2D直連通信能夠有效的提升小區(qū)的頻譜效率及吞吐量,與現(xiàn)有的通信模式選擇方法及D2D資源分配方法相比,本文所提出的算法具有更好的性能。
[Abstract]:With the popularity of smart phones, the amount of business data has explosive growth, which puts forward new requirements for the existing LTE communication network. On the other hand, new types of services, such as geographical location, are emerging. New business types, such as inter-vehicle communications, are also gradually being deployed. In order to cope with these new trends, LTE R12 has also begun to consider introducing D2D direct communication solutions to LTE cellular networks to provide higher data transmission rate, lower delay and lower energy consumption for user devices. However, for D2D direct communication, resource allocation and communication mode selection are the key problems to be solved. In this paper, a new communication mode selection method and a new D2D resource allocation method are proposed, and the simulation model of D2D direct communication system is designed and implemented on NS3 simulation platform. The proposed mode selection method takes into account the channel quality of D2D direct communication link and the usage of cellular mobile communication resources and D2D direct link communication resources. In order to maximize the data transmission rate and spectral efficiency of the system, the limited communication resources can be allocated to the channel quality direct communication link as much as possible. In the D2D resource allocation method proposed in this paper, there is no resource reuse between the original LTE cellular communication and the newly added D2D direct communication. The LTE system reserves some resources for D2D direct communication to be used for D2D direct communication. These resources are orthogonal to LTE communication resources, so there is no interference between D2D direct communication and cellular communication. The D2D resource allocation method proposed in this paper allows for resource reuse between D2D direct communication links. For the new D2D direct communication link, in order to maximize spectrum efficiency in resource allocation, the first consideration is to reuse the allocated resources. If the allocated resources cannot be reused, new resources are allocated to the D2D direct communication link. In addition, the resource allocation method proposed in this paper allows one UE to have multiple D2D direct communication links at the same time, and allows D2D direct communication to exist simultaneously with cellular communication. In addition, the simulation model of D2D direct communication system is designed and implemented based on LTE module of NS3 simulation platform. Based on the D2D direct communication system simulation model implemented in this paper, the D2D mode selection method and resource allocation method proposed in this paper are simulated. The simulation results show the cell communication performance under different configuration parameters. The simulation results show that adding D2D direct communication to LTE cellular network can effectively improve the cell spectrum efficiency and throughput, compared with the existing communication mode selection methods and D2D resource allocation methods. The proposed algorithm has better performance.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.5

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