Method and apparatus for NR-DMRS sequence design

A base station (BS) for controlling reference signal in a wireless communication system, the BS comprising:

• a processor configured to:
• determine resources to be used for a demodulation reference signal (DMRS) of a physical broadcasting channel (PBCH),
• generate a pseudo-noise (PN) sequence based on an initial condition c_B given by:
• c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I_ID,4),
• where I_ID is a physical cell identification (ID) and I_IT is timing information included in a DMRS sequence, and
• map the PN sequence to the resources to be used for the DMRS of the PBCH;
• and
• a transceiver operably connected to the processor, the transceiver configured to transmit, to a user equipment (UE), the DMRS of the PBCH over a downlink channel.

A method of a user equipment (UE) for controlling reference signal in a wireless communication system, the method comprising:

• receiving, from a base station (B S), a demodulation reference signal (DMRS) of a physical broadcasting channel (PBCH) over a downlink channel;
• and
• determining resources to be used for the DMRS of the PBCH, wherein a pseudo-noise (PN) sequence that is mapped to the resources to be used for the DMRS of the PBCH is generated by a base station (BS), and wherein the PN sequence is generated based on an initial condition c_B given by:
• c_B=2{circumflex over ( )}11*(I_t+1)*(└I_ID/4┘+1)+2{circumflex over ( )}6*(I_t+1)+mod(I_ID,4),
• where I_ID is a physical cell identification (ID) and I_IT is timing information included in a DMRS sequence.