标题: | LTE高密度小细胞网路使用多点协调传输技术之下行资源配置 Resource Allocation with CoMP Support for Downlink Transmissions in the LTE Small Cell Ultra Dense Network |
作者: | 陈艺文 赵禧绿 Chen, Yi-Wen Chao, His-Lu 网路工程研究所 |
关键字: | 多点协调;资源配置;长期演进;CoMP;Resource Allocation;LTE |
公开日期: | 2016 |
摘要: | LTE为3GPP制订的标准,是目前4G网路最具前景的科技之一,其目标为提供高速资料传输、弹性频宽使用、减少传输延迟时间、以及支援高速移动传输等技术性服务。为了达成此目的,LTE在下行系统和上行系统分别使用OFDMA与SC-FDMA的编码技术,使它能突破传统无线网路技术上的限制,晋升为4G网路的一员。 多点协调是被3GPP视为ㄧ个很重要的技术,尤其是对于位在边界的用户,这项技术能够有效的提升这些用户的吞吐量以及可靠信,多点协调技术主要可以分为两个项目,分别为Joint Transmission (JT)以及Coordinated Scheduling/Beamforming (CS/CB) ,在JT模式下合作的基地台可以同时服务一个相同的使用者,而在CS/CB模式中,每个基地台除了能服务原本自己下面的使用者外,还能服务合作群中的使用者。由于多点排程下的排程是相当的复杂,为了降低计算复杂度,我们进而提出启发式的演算法,尝试去逼近问题的最佳解。并且在模拟中也会根没有使用多点协调技术来做比较,来看出使用这项技术的好处。 Long Term Evolution (LTE), one of most promising technology for 4G mobile networks, is the latest standard of 3rd Generation Partnership Project (3GPP). The goal of LTE is to provide high data rate transmission, flexible frequency usage, smaller latency, and supportable transmission in high mobility. To achieve this, LTE employs the modulation technique by OFDMA in downlink and SC-FDMA in uplink, breaking the technical limitations of traditional wireless, and makes itself be the one of members of 4G mobile networks. Coordinated Multi-Point (CoMP) transmission and reception is one of the most promising technologies introduced in 3GPP standard. Expecially targeting the User Equipments (UEs) in the cell edge region, CoMP technology improves the edge throughput and reliabilityy in two ways: Joint Transmission (JT) and Coordinated Scheduling/Beamforming (CS/CB). With JT mode, the cooperating eNBs jointly serve a specific UE. With CS/CB mode, each eNB provides a service to the UE in the cooperating eNB group. Since the optimization problem of resource allocation in CoMP scheduling is NP-hard, we proposes an algorithm which allocates the frequency band to each UE and could operate in JT, CS/CB mode. We evaluate the proposed formulation and heuristic algorithms by conducting simulation. The performance of the proposed algorithm is comparatively evaluated along with that of other schemes such as non-coordination schemes. |
URI: | http://etd.lib.nctu.edu.tw/cdrfb3/record/nctu/#GT070256531 http://hdl.handle.net/11536/141951 |
显示于类别: | Thesis |