n101 (1900 MHz)

The "RMR 1900" band operates in a TDDTDD: A wireless communication technique that uses a single frequency band for both transmitting and receiving operations but separates these operations in time. In a TDD system, upstream (transmission from user equipment to base station) and downstream (transmission from base station to user equipment)… configuration from 1900 to 1910 MHz. It is another element of the EU's Future Railway Mobile Communications System (FRMCS) initiative, intended to upgrade the current GSM-R system with superior capabilities to better serve railway communications. The n101 band was introduced in the 3GPP Release 17.5 in April 2022.