YD/T 4553-2023
5G multi-mode digital indoor distribution system testing method (English Version)

Standard No.

YD/T 4553-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

Professional Standard - Post and Telecommunication  CN  /  YD

Latest

YD/T 4553-2023

Introduction

Standard framework and technological evolution

As an important part of the 5G multi-mode digital indoor distribution series of standards, this standard forms a technical continuation with the existing LTE standard (YD/T 3636-2020) and 5G single-mode standard. The main evolution features include:

Technical dimensions	LTE standard requirements	New requirements for 5G multi-mode
Operating frequency band	1.8-2.6GHz	Extended to the full Sub-6GHz band
Bandwidth support	Maximum 20MHz	Support 100MHz carrier aggregation
MIMO configuration	4T4R	Upgrade to 64T64R Massive MIMO

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Analysis of core test items

1. Networking capability test

Key indicator requirements for the wireless radio frequency unit:

• POE power supply distance ≥100m (CAT6A network cable)
• Optical composite cable power supply distance ≥200m
• Baseband unit supports multi-cell configuration (A1-M specification supports at least 3 NR cells)

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2. Baseband function verification

Typical test case: Multi-antenna technology verification

When using a vector signal analyzer to test MU-MIMO performance, the following must be met:

EVM indicator	NR: ≤3.5% (256QAM)
ACLR	LTE: ≥45dBc (20MHz bandwidth)

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Key points of environmental adaptability test

Performance requirements of wireless RF unit in extreme environments:

Test type	Temperature condition	Voltage fluctuation
Low temperature test	-5℃	DC-57V/AC176V
High temperature test	55℃	DC-40V/AC264V

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Implementation Suggestions

1. Test instrument selection: Prioritize the use of protocol testers that support NR/LTE dual-mode analysis
2. Energy saving function verification: It is recommended to test the power saving efficiency of deep sleep mode under idle load
3. Multi-mode interference test: The NR and LTE carriers need to be turned on simultaneously for cross-interference detection

YD/T 4553-2023 Referenced Document

• GB 4943.1-2011 Information technology equipment.Safety.Part 1:General requirements
• YD/T 3636-2020 Baseband feed digital distribution system equipment test method
• YD/T 3924-2021 TD-LTE digital cellular mobile communication network base station equipment testing method (Phase 4)
• YD/T 3926-2021 LTE FDD digital cellular mobile communication network base station equipment testing method (Phase 4)

YD/T 4553-2023 history

• 2023 YD/T 4553-2023 5G multi-mode digital indoor distribution system testing method

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