Vietnam Allocates Three Frequency Bands for Railway Mobile Communications

Vietnam’s Ministry of Science and Technology has issued a frequency plan for railway mobile communications, allocating the 874.4–880 MHz, 919.4–925 MHz and 1900–1910 MHz bands for railway control, dispatching and train safety. The regulations take effect on December 24, 2026.

Illustration of the frequency plan for railway mobile communications.（VietVance）

The 874.4–880 MHz band is designated for uplink transmission and the 919.4–925 MHz band for downlink transmission. Both use frequency division duplexing, with a bandwidth of 5.6 MHz each. The 1900–1910 MHz band uses time division duplexing and is allocated as a single 10 MHz block.

To reduce harmful interference between railway communications and other radio systems, the regulations require licensed frequency users to agree on frequency use and technical measures where coverage areas overlap or adjoin, railway lines cross or run in parallel, or stations are shared. Coordination must begin during network planning and design and continue through construction and operation. It may cover coverage areas, base station locations and transmission power, antenna configurations, and channel allocation.

For the 1900–1910 MHz band, licensees in an adjacent public mobile communications band must proactively take technical measures to guard against potential interference from railway communications transmitters. Users of related bands, including 918.4–923 MHz, 890–915 MHz and 935–960 MHz, must also coordinate with railway communications operators to prevent and resolve harmful interference. When the new regulations take effect, provisions of a 2008 frequency plan concerning the two lower bands will be repealed.

Source: VietVance