移动网络基于分组的Cloud-RAN前传中的同步挑战

Aleksandra Checko, Anders Christian Juul, H. Christiansen, M. Berger
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引用次数: 22

摘要

在本文中,我们着眼于重用现有的基于分组的网络(例如以太网),以可能降低前传云无线接入网(C-RAN)网络的部署成本和基带单元(BBU)资源的成本。这种解决方案的挑战在于,它要求移动流量(直到现在都是通过同步协议传输的)在不丢失同步的情况下遍历异步以太网。我们分析了移动网络的同步需求,并概述了在传统移动网络中满足这些需求的解决方案。然后,我们详细阐述了基于分组的前传带来的挑战。我们分析了可能对频率和相位误差的贡献。我们验证了使用IEEE 1588v2(也称为精确时间协议(PTP))提供精确相位和频率同步的可行性。该研究是基于在OPNET modeler中进行的仿真。因此,我们弥合了以太网和移动网络领域之间的差距,创建了一个全面的体系结构分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synchronization challenges in packet-based Cloud-RAN fronthaul for mobile networks
In this paper, we look at reusing existing packet-based network (e.g. Ethernet) to possibly decrease deployment costs of fronthaul Cloud Radio Access Network (C-RAN) network and cost of Baseband Unit (BBU) resources. The challenge of this solution is that it requires mobile traffic (until now transmitted over synchronous protocols) to traverse the asynchronous Ethernet without losing synchronization. We analyze synchronization requirements of mobile networks and present an overview of solutions that fulfill them in traditional mobile networks. Then we elaborate on challenges that packet-based fronthaul imposes. We analyze possible contributions to frequency and phase error. We verify the feasibility of using the IEEE 1588v2 also know as Precision Time Protocol (PTP) for providing accurate phase and frequency synchronization. The study is based on simulations made in OPNET modeler. Thereby we bridge the gap between Ethernet and mobile network domains creating a comprehensive architectural analysis.
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