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Timing and Synchronization for 5G Open RAN Networks

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Timing and Synchronization for 5G Open RAN Networks hero

Learn about timing and synchronization considerations for 5G Open RAN Networks to deliver the full range of enhanced capabilities available with 5G New Radio.

It is impossible to ignore the current waves in the telecoms industry caused by the emergence of Open RAN. An ever-increasing number of major telecoms operators and vendors are moving to support the splitting of (previously integrated) network solutions and platforms into interoperable Whitebox hardware, middleware/Operating Systems, and software or virtual network functions (VNFs).

The Radio Access Network (RAN) can particularly benefit as a result, as network operators will choose optimized hardware and software solutions from a range of incumbent and new vendors to meet the specific needs of their network.

Despite these advantages, guaranteeing performance and managing complexity are inherent challenges of this new approach. In practice, the responsibility for validating and deploying systems will fall on network operators themselves – either directly, or through partnerships with Systems Integrators (SI).

The need for timing and synchronization

It should be noted that as Open RAN networks are intended to deliver the full range of enhanced capabilities available with 5G New Radio, the fundamental need for the network to deliver highly accurate synchronization (using Precision Time Protocol and Synchronous Ethernet) remains.

Often network operators require network equipment to meet strict timing requirements, such as ITU-T G.8273.2 Class-C specifications, with each device delivering nanoseconds level timing performance.

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Open RAN Synchronization Requirements

The combination of these specific timing requirements and the additional complexity of multi-vendor environments means it is critical to be able to identify and validate all aspects of network timing performance.

Synchronization plane (S-plane) has been identified as a key aspect of O-RAN specifications, with requirements defined in the working groups for Fronthaul, Open Interfaces and Transport.

引述

The additional complexity of multi-vendor environments means it is critical to be able to identify and validate all aspects of network timing performance.

The devil is in the details

When it comes to validating network timing performance, “the devil is in the details," with synchronization a foundational element, affecting multiple functions distributed throughout the network as well as having a direct impact on radio performance.

O-RAN is used by 3GPP for radio specifications, and ITU-T and IEEE for ‘transport’ standards: in all cases this includes definition of synchronization requirements.

Open RAN is made possible through standardized open network interfaces, defined in 3GPP (radio specifications), O-RAN Alliance, ITU-T and IEEE (transport standards) among others.

All in all, it is vital to take a holistic view of the specifics of S-plane, as identified in the multiple areas of O-RAN specifications, as well as the fundamental timing requirements defined in ITU-T, which provide the building blocks and help determine how the S-plane requirements of ITU-T, O-RAN and 3GPP interact. These specifications must be considered when creating a comprehensive plan for testing synchronization performance of devices and systems, in a way that reflects related complexity.

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Testing an Open Distributed Unit (O-DU) for Open Fronthaul Conditions

Stay tuned for additional insights around the timing and synchronization considerations for 5G Open RAN Networks.

Learn more about solving the timing challenges of 5G右箭头图标

Guest contributor: Adam Paterson, Head of Product Management, Calnex Solutions

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Stephen Douglas
Stephen Douglas

思博伦市场战略总监

Stephen现就职于思博伦的战略部门,负责协助定义技术方向、新型创新解决方案和市场领先的颠覆技术。Stephen在电信领域拥有近20年的从业经验,一直从事最尖端的下一代技术方面的工作,并且曾经该行业中多家服务商、新兴企业和一线OEM厂商中任职,助力这些企业推进各项创新和变革。Stephen是联网技术的忠实倡导者,并且一直在努力挑战、化解和突破阻碍创新和商业成功的各种藩篱。