RS (reference signal) sequence generation and mapping and precoder assignment for NR (new radio)
Systems, methods, and circuitries are disclosed for determining Precoding Resource Block Groups (PRGs). In one example, a processor of a base station (BS) is configured to determine a plurality of PRGs that includes a number N consecutive Physical Resource Blocks (PRBs) over which a same precoder assignment is used, starting from a reference PRB. The plurality PRGs include a first boundary PRG, a second boundary PRG, and one or more other PRGs. The first boundary PRG is located at an upper boundary of a bandwidth part. The first boundary PRG comprises fewer than N PRBs when the upper boundary of the bandwidth part is not aligned with a PRG boundary. The second boundary PRG comprises fewer than N PRBs when a lower boundary of the bandwidth part is not aligned with a PRG boundary. A downlink data channel is transmitted to a UE in accordance with the precoder assignments.
1. 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 the 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 of the first boundary PRG 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 of the second boundary PRG; and
transmit a downlink data channel to a user equipment (UE) in accordance with the precoder assignments.
2. The baseband processor of claim 1 , wherein the reference PRB is a center resource block of a synchronization signal (SS) block.
3. The baseband processor of claim 1 , further configured to determine the reference PRB based at least in part on a configured offset.
4. The baseband processor of claim 1 , wherein the reference PRB is a cell-specific reference PRB.
5. The baseband processor of claim 1 , wherein the reference PRB is a UE-specific reference PRB.
6. The baseband processor of claim 1 , wherein the reference PRB is determined based on a resource allocation of the UE.
7. The baseband processor of claim 6 , wherein the reference PRB is a center resource block of the resource allocation of the UE.
8. The baseband processor of claim 6 , wherein the reference PRB is a lowest resource block of the resource allocation of the UE.
9. The baseband processor of claim 6 , wherein the reference PRB is a highest resource block of the resource allocation of the UE.
10. The baseband processor of claim 6 , wherein the resource allocation comprises all PRBs scheduled for the UE in a slot.
11. The baseband processor of claim 6 , wherein the resource allocation comprises a configured bandwidth part for the UE.
12. A method for a base station (BS), comprising:
determining 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,
determining the precoder assignment for each PRG of the plurality of PRGs;
wherein the plurality of 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 of the first boundary PRG 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 of the second boundary PRG; and
transmitting a downlink data channel to a user equipment (UE) in accordance with the precoder assignments.
13. The method of claim 12 , wherein the reference PRB is a center resource block of a synchronization signal (SS) block.
14. The method of claim 12 , further comprising determining the reference PRB based at least in part on a configured offset.
15. The method of claim 12 , wherein the reference PRB is a cell-specific reference PRB.
16. The method of claim 12 , wherein the reference PRB is a UE-specific reference PRB.
17. The method of claim 12 , wherein the reference PRB is determined based on a resource allocation of the UE.
18. The method of claim 17 , wherein the reference PRB is a center resource block of the resource allocation of the UE.
19. The method of claim 17 , wherein the reference PRB is a lowest resource block of the resource allocation of the UE.
20. The method of claim 17 , wherein the reference PRB is a highest resource block of the resource allocation of the UE.
21. The method of claim 17 , wherein the resource allocation comprises all PRBs scheduled for the UE in a slot.
22. The method of claim 17 , wherein the resource allocation comprises a configured bandwidth part for the UE.