Rs (reference signal) sequence generation and mapping and precoder assignment for nr (new radio)

A baseband processor of a base station (BS), configured to:

• determine a plurality of Precoding Resource Block Groups (PRGs), wherein each PRG comprises a number N of consecutive Physical Resource Blocks (PRBs) over which a same precoder assignment is used, starting from a reference PRB,
• determine a precoder assignment for each PRG of the plurality of PRGs;
• wherein the plurality PRGs comprise a first boundary PRG, a second boundary PRG, and one or more other PRGs, wherein the first boundary PRG is located at an upper boundary of a bandwidth part, wherein the bandwidth part comprises M PRBs, wherein M is a positive integer greater than N, wherein the first boundary PRG comprises fewer than N PRBs when the upper boundary of the bandwidth part is not aligned with a PRG boundary and wherein the second boundary PRG comprises fewer than N PRBs when a lower boundary of the bandwidth part is not aligned with a PRG boundary;
• and
• transmit a downlink data channel to a user equipment (UE) in accordance with the precoder assignments.