An apparatus for use in a UE includes processing circuitry coupled to a memory. To configure the UE for high-speed train (HST) communications in a 5G-NR network, the processing circuitry is to decode configuration signaling received from an RRH operating as a gNB. The configuration signaling indicating an upcoming configuration transmission of network assistance information from the RRH. The network assistance information received from the RRH is decoded. TRS-based processing is performed to track a frequency offset (FO) associated with a downlink data transmission from the RRH. The TRS-based processing using a single-shot FO estimation based on a FO instruction in the network assistance information received from the RRH. The downlink data transmission is demodulated based on applying a local oscillator (LO) adjustment using the FO.