LTE-A中繼系統(tǒng)中資源分配和吞吐量的研究
發(fā)布時間：2018-08-25 07:20
【摘要】：移動通信行業(yè)是世界范圍內用戶數量增長最快的行業(yè),移動通信系統(tǒng)經過了2G、3G和4G的演進,即將迎來更快、更密、更智能的5G時代。在這不斷演進的過程中,緊緊跟隨的是移動通信技術的不斷提升和更新,其中就包括一項非常重要的技術——LTE-A標準引入的中繼技術。要滿足人們隨時隨地的上網需求,中繼是不可或缺的。中繼是一種具有低成本、易部署、改善覆蓋、提高容量等特點的無線通訊設備。但是中繼的加入對原有的蜂窩直傳用戶產生了干擾,破壞了蜂窩系統(tǒng)的公平性。為了解決此問題,現存的大部分方案都是直接讓中繼用戶使用的資源塊與蜂窩直傳用戶使用的資源塊正交,這些方案雖然能夠避免干擾的產生,但是帶來了頻譜效率低下的缺陷。在保證直傳用戶和中繼用戶QoS需求的基礎之上,為了增加頻譜效率,提高系統(tǒng)吞吐量,并且保障蜂窩系統(tǒng)具有好的公平性,本文提出了兩種基于PF調度的新資源分配方案:NPF和NRA。第一種NPF資源分配方案,基本思想是將回程鏈路和接入鏈路捆綁為一個虛擬用戶,直傳鏈路作為一個虛擬用戶。首先在一個調度幀內,所有虛擬用戶采用PF調度進行資源分配,保證蜂窩系統(tǒng)具有好的公平性;然后再進一步給回程鏈路和接入鏈路分別在兩個時隙內分配資源,使得整個系統(tǒng)吞吐量最大。第二種NRA資源分配方案,基本思想是中繼用戶接入鏈路使用的資源塊和蜂窩系統(tǒng)直傳用戶使用的資源塊非正交共享。首先在第二時隙,給每一條中繼用戶接入鏈路選出最佳的直傳用戶來共享資源塊,保證蜂窩系統(tǒng)公平性破壞最小;然后在第一時隙,先給回程鏈路分配資源塊,再將剩余的資源塊分配給直傳鏈路,使得整個系統(tǒng)吞吐量最大。仿真結果表明:與傳統(tǒng)的PF調度中繼方案相比,這兩種方案都減小了中繼用戶對原有直傳用戶的干擾,改善了整個蜂窩系統(tǒng)的公平性及吞吐量,增加了頻譜效率。
[Abstract]:The mobile communication industry is the fastest growing industry in the world. With the evolution of 3G and 4G, the mobile communication system is approaching a faster, denser and more intelligent 5G era. In the process of continuous evolution, it is closely followed by the continuous upgrading and updating of mobile communication technology, including a very important technology, the relay technology introduced by LTE-A standard. To meet the needs of people anytime, anywhere online, relay is indispensable. Relay is a low-cost, easy-to-deploy, improved coverage, increased capacity and other characteristics of wireless communication equipment. However, the addition of relay interferes with the original cellular direct transmission users and destroys the fairness of cellular systems. In order to solve this problem, most of the existing schemes are directly orthogonal between the resource blocks used by relay users and those used by cellular direct users, although these schemes can avoid interference. But it brings about the defect of inefficient spectrum. In order to increase spectrum efficiency, improve system throughput and ensure good fairness of cellular system, two new resource allocation schemes based on PF scheduling, namely: NPF and NRA., are proposed in this paper, on the basis of guaranteeing the QoS requirements of direct users and relay users. The basic idea of the first NPF resource allocation scheme is to bind the backhaul link and the access link into a virtual user and the direct link as a virtual user. First of all, in a scheduling frame, all virtual users allocate resources using PF scheduling to ensure that the cellular system has good fairness. Then, the backhaul link and the access link are allocated resources in two time slots respectively. Make the whole system throughput maximum. The basic idea of the second NRA resource allocation scheme is that the resource block used by the relay user access link and the resource block used by the direct transmission user in the cellular system are not orthogonal shared. First, in the second time slot, the best direct users are selected for each relay user access link to share the resource block, so as to ensure the minimum damage to the fairness of the cellular system; then, in the first time slot, the return link is first allocated a resource block. Then the remaining resource blocks are allocated to the direct link to maximize the throughput of the whole system. The simulation results show that compared with the traditional PF scheduling relay scheme, both schemes reduce the interference of relay users to the original direct users, improve the fairness and throughput of the whole cellular system, and increase the spectral efficiency.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5
本文編號：2202152
[Abstract]:The mobile communication industry is the fastest growing industry in the world. With the evolution of 3G and 4G, the mobile communication system is approaching a faster, denser and more intelligent 5G era. In the process of continuous evolution, it is closely followed by the continuous upgrading and updating of mobile communication technology, including a very important technology, the relay technology introduced by LTE-A standard. To meet the needs of people anytime, anywhere online, relay is indispensable. Relay is a low-cost, easy-to-deploy, improved coverage, increased capacity and other characteristics of wireless communication equipment. However, the addition of relay interferes with the original cellular direct transmission users and destroys the fairness of cellular systems. In order to solve this problem, most of the existing schemes are directly orthogonal between the resource blocks used by relay users and those used by cellular direct users, although these schemes can avoid interference. But it brings about the defect of inefficient spectrum. In order to increase spectrum efficiency, improve system throughput and ensure good fairness of cellular system, two new resource allocation schemes based on PF scheduling, namely: NPF and NRA., are proposed in this paper, on the basis of guaranteeing the QoS requirements of direct users and relay users. The basic idea of the first NPF resource allocation scheme is to bind the backhaul link and the access link into a virtual user and the direct link as a virtual user. First of all, in a scheduling frame, all virtual users allocate resources using PF scheduling to ensure that the cellular system has good fairness. Then, the backhaul link and the access link are allocated resources in two time slots respectively. Make the whole system throughput maximum. The basic idea of the second NRA resource allocation scheme is that the resource block used by the relay user access link and the resource block used by the direct transmission user in the cellular system are not orthogonal shared. First, in the second time slot, the best direct users are selected for each relay user access link to share the resource block, so as to ensure the minimum damage to the fairness of the cellular system; then, in the first time slot, the return link is first allocated a resource block. Then the remaining resource blocks are allocated to the direct link to maximize the throughput of the whole system. The simulation results show that compared with the traditional PF scheduling relay scheme, both schemes reduce the interference of relay users to the original direct users, improve the fairness and throughput of the whole cellular system, and increase the spectral efficiency.
【學位授予單位】：南京郵電大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.5
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