A Comprehensive Survey of RAN Architectures Toward 5G Mobile Communication System
A Comprehensive Survey of RAN Architectures Toward 5G Mobile Communication System
复制标题
DOI：
10.1109/access.2019.2919657
复制
发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Schotten, Hans D.
中科院分区：
文献类型：
--
作者：
Habibi, Mohammad Asif;Nasimi, Meysam;Schotten, Hans D.
第五代（5G）移动的通信系统旨在提供具有增强的服务质量（QoS）的无处不在的移动的服务。它还有望为各种垂直行业应用（如汽车、公共交通、医疗保健、能源、公共安全、农业、娱乐、制造业等）提供新的用例。预计用户密度、流量和数据速率将迅速增加。这就要求在未来十年内为满足移动的用户和垂直行业的需求提供新的解决方案。在各种可用选项中，重新设计网络架构-更具体地说，重建无线电接入网络（RAN）似乎是一个有吸引力的选择。在本文中，我们对面向5G的各种RAN架构进行了全面而全面的调查，即云RAN，异构云RAN，虚拟化云RAN和雾RAN。我们从不同的角度，如能源消耗，运营支出，资源分配，频谱效率，系统架构和网络性能进行比较。此外，我们还回顾了5G系统的关键使能技术，如多接入边缘计算，网络功能虚拟化，软件定义网络和网络切片;以及一些关键的无线电接入技术（RAT），如毫米波，大规模多输入多输出，设备到设备通信和大规模机器类型通信。最后，我们讨论了5G RAN和5G RAT的主要研究挑战，并确定了未来研究的几个可能方向。
The fifth generation (5G) of mobile communication system aims to deliver a ubiquitous mobile service with enhanced quality of service (QoS). It is also expected to enable new use-cases for various vertical industrial applications-such as automobiles, public transportation, medical care, energy, public safety, agriculture, entertainment, manufacturing, and so on. Rapid increases are predicted to occur in user density, traffic volume, and data rate. This calls for novel solutions to the requirements of both mobile users and vertical industries in the next decade. Among various available options, one that appears attractive is to redesign the network architecture-more specifically, to reconstruct the radio access network (RAN). In this paper, we present an inclusive and comprehensive survey on various RAN architectures toward 5G, namely cloud-RAN, heterogeneous cloud-RAN, virtualized cloud-RAN, and fog-RAN. We compare them from various perspectives, such as energy consumption, operations expenditure, resource allocation, spectrum efficiency, system architecture, and network performance. Moreover, we review the key enabling technologies for 5G systems, such as multi-access edge computing, network function virtualization, software-defined networking, and network slicing; and some crucial radio access technologies (RATs), such as millimeter wave, massive multi-input multi-output, device-to-device communication, and massive machinetype communication. Last but not least, we discuss the major research challenges in 5G RAN and 5G RATs and identify several possible directions of future research.