Mechanism for transmission and reception of demodulation reference signal

An apparatus comprising processing circuitry, wherein the processing circuitry is configured to:

• receive a downlink signal from a control resource set (CORESET), wherein a demodulation reference signal (DMRS) sequence has been mapped, according to a frequency-first mapping, onto resource elements occurring in one or more physical resource blocks (PRBs) and one or more Orthogonal Frequency Division Multiplexing (OFDM) symbols of the CORESET, wherein the DMRS sequence is based on a pseudo-noise (PN) sequence, wherein an initialization of the PN sequence is a function at least of a parameter for the CORESET and one or more indices corresponding respectively to the one or more OFDM symbols;
• and
• recover the DMRS sequence from the downlink signal.