Methods, systems, and devices for modifying reference signal parameters to improve channel estimation in mobile communication technology are described. An example method for wireless communication includes transmitting, by a first communication node to a second communication node, a reference signal, at least one parameter of the reference signal having been modified based on a Downlink Control Information (DCI) format message or a Medium Access Control (MAC) message, and the at least one parameter comprising one or more of a number of orthogonal frequency division multiplexing (OFDM) symbols in the reference signal, a number of OFDM symbols in the reference signal in a frequency-domain range, a time-domain position of a first symbol of the reference signal, and a number of repeated transmissions of the reference signal.