On November 6, 2026, the Ministry of Science and Technology (MST) of Vietnam issued the "Notice on the Planning of the 874.4–880 MHz, 919.4–925 MHz, and 1900–1910 MHz Frequency Band Planning for the Vietnam Railway Mobile Communication System" (No. 67/2026/TT-BKHCN). This notice is a mandatory spectrum regulation formulated under the "Radio Frequency Law" and repeals the 900 MHz band clause in Decision No. 25/2008/QĐ-BTTTT. Production, import, operation, and frequency usage of railway-specific wireless equipment in Vietnam must be declared according to the new frequency band requirements; public terrestrial mobile networks are not eligible.

The main requirements are as follows:

• 900 MHz band: FDD, uplink 874.4–880, downlink 919.4–925 MHz, each 5.6 MHz;
• 1900 MHz band: 1900–1910 MHz, TDD (3GPP n101);
• Coordination obligations: overlapping coverage, parallel line crossing, and sharing stations must negotiate boundary field strength and antenna parameters;
• Neighbor Frequency Avoidance: 1920–1980 MHz public network side improves reception selectivity; 918.4–923 MHz license holders have mutual coordination obligations

Click this link to view the original text of MST Notice No. 67/2026/TT-BKHCN.