RFID Frequency 918-923 MHz in Vietnam: Compliance & Technical Recommendations

The compliant RFID frequency for fixed asset inventory in Vietnam is specifically regulated in Circular 08/2021/TT-BTTTT of the Ministry of Information and Communications. Accordingly, UHF RFID equipment must operate in the 918.4–923 MHz band with a maximum transmit power of 500 mW ERP. This article analyzes the regulations in detail, their impact on device selection, and technical recommendations for effective deployment in factory and warehouse environments in Vietnam.

Table of Contents

• What is the compliant RFID frequency and why is it important for asset inventory?
• What are the specific regulations for the 918.4–923 MHz band under Circular 08/2021/TT-BTTTT?
• Summary table: Comparison of RFID frequency regulations between Vietnam, the US, and Europe
• How do frequency regulations affect the selection of RFID readers and tags?
• Technical recommendations to avoid interference and optimize read performance in factories?
• Common mistakes when deploying RFID asset inventory in Vietnam
• Standard process for deploying an RFID asset inventory system
• Is investing in an RFID asset inventory system expensive?
• Frequently Asked Questions

#What is the compliant RFID frequency and why is it important for asset inventory?

The compliant RFID frequency is the radio frequency band in which RFID equipment is legally allowed to operate in a country. In Vietnam, the 918.4–923 MHz band is designated for UHF RFID applications under Circular 08/2021/TT-BTTTT. Adhering to the compliant frequency ensures stable operation, avoids interference with other systems, and is legally recognized.

For businesses deploying fixed asset inventory, choosing the correct compliant RFID frequency is not just a legal matter but also directly affects read performance. Non-compliant imported equipment may operate on incorrect frequencies, causing interference or being interfered with by other devices in the area, leading to low read rates and inaccurate data.

This regulation applies to both fixed readers, handheld readers, and UHF RFID tags. Businesses need to check the supplier's certificate of conformity before investing, especially when importing equipment from the US market (902–928 MHz band) or Europe (865–868 MHz band) — these bands are not fully compatible with Vietnamese regulations.

#What are the specific regulations for the 918.4–923 MHz band under Circular 08/2021/TT-BTTTT?

What are the specific regulations for the 918.4–923 MHz band under Circular 08/2021/TT-BTTTT?

Circular 08/2021/TT-BTTTT, issued on June 25, 2021, stipulates that the 918.4–923 MHz band is used for UHF RFID equipment in Vietnam, with a maximum transmit power of 500 mW ERP. This is the primary legal basis for the import, circulation, and use of RFID equipment in the country.

According to Article 4 of Circular 08/2021/TT-BTTTT, RFID equipment operating in the 918.4–923 MHz band must meet the following technical conditions:

• Maximum effective radiated power (ERP): 500 mW
• Occupied bandwidth: not exceeding 200 kHz per channel
• Modulation method: FHSS (Frequency Hopping Spread Spectrum) or DSSS (Direct Sequence Spread Spectrum)
• Equipment must have a certificate of conformity under QCVN 55:2021/BTTTT

Compared to international standards, the Vietnamese band (918.4–923 MHz) is closer to the US FCC standard (902–928 MHz) than the European ETSI standard (865–868 MHz). However, the main difference lies in the power limit — the US allows up to 4 W EIRP (≈ 2.4 W ERP), while Vietnam limits to 500 mW ERP. This directly affects the maximum read range of the system.

#Summary table: Comparison of RFID frequency regulations between Vietnam, the US, and Europe

The comparison table below helps businesses clearly visualize the differences between common UHF RFID frequency standards worldwide, thereby selecting equipment suitable for the Vietnamese market.

Parameter	Vietnam	US (FCC)	Europe (ETSI)
Operating frequency band	918.4 – 923 MHz	902 – 928 MHz	865 – 868 MHz
Maximum power	500 mW ERP	4 W EIRP (~2.4 W ERP)	2 W ERP
Maximum read range	3 – 7 meters	8 – 15 meters	5 – 10 meters
Legal basis	Circular 08/2021/TT-BTTTT	FCC Part 15.247	ETSI EN 302 208
Modulation method	FHSS / DSSS	FHSS	LBT (Listen Before Talk)

When importing RFID equipment, businesses should require the supplier to confirm that the equipment is compatible with the Vietnamese frequency band. Many high-end reader models from Zebra, Impinj currently support multi-region configuration, allowing switching between FCC and Vietnamese standards via software. However, incorrect configuration can lead to regulatory violations and cause interference to other systems.

#How do frequency regulations affect the selection of RFID readers and tags?

How do frequency regulations affect the selection of RFID readers and tags?

The 918.4–923 MHz frequency regulation directly affects the selection of RFID readers and UHF tags. Businesses need to choose equipment with Vietnamese conformity certification, ensuring compatibility with the frequency band and transmit power as regulated for stable and legal operation.

Regarding RFID readers, popular product lines in Vietnam include:

• Fixed readers: Zebra FX9600, Impinj Speedway R420 — support multi-region configuration, allowing switching to the Vietnamese band
• Handheld readers: Zebra MC3390R, Chainway P80 — designed for factory and warehouse environments
• Desktop readers: Suitable for inventory points and asset handover

Regarding UHF RFID tags, note the following:

• UHF-10 RFID Tag, UHF Pallet RFID Tag — suitable for large assets and goods pallets
• VP-T902 metal-mount RFID tag — specially designed for metal assets (machinery, production equipment)
• VP-RT208 active RFID tag — for high-value assets requiring real-time location tracking

When selecting, businesses should request the supplier to provide a Certificate of Conformity under QCVN 5