n100 (900 MHz)

Also known as "RMR 900", this band has been specifically allocated for Rail Mobile Radio communications. As part of the European Union's Future Railway Mobile Communications System (FRMCS), it is designed to replace the ageing GSM-R network, offering more reliable and faster connections for railway systems. The band uses an FDDFDD: A communication technology that uses separate frequency bands for transmitting and receiving operations. This technique enables simultaneous bi-directional communication by allocating one frequency band for upstream (transmission from the user equipment to the base station) and another distinct… configuration with uplink frequencies ranging from 874.4 to 880 MHz and downlink frequencies from 919.4 to 925 MHz. The n100 band was standardised in 3GPP Release 17.6 in June 2022.