Frequency division multiplexing for mixed numerology
A base station may utilize frequency division multiplexing (FDM) techniques to signal synchronization signal (SS) blocks and downlink transmissions (e.g., data/control transmissions). The base station may configure a configuration for a bandwidth part (BWP) of a carrier for downlink transmissions. The BWP configuration may include a transmission attribute (e.g., a subcarrier spacing (SCS)) for downlink transmissions within the BWP. The base station may transmit a grant for a downlink transmission to a user equipment (UE). In some cases, the downlink transmission may be scheduled for a set of resources that overlap in time with a SS block for the carrier. The base station may transmit downlink transmissions within the BWP using transmission attributes configured for the BWP and/or using SS block transmission attributes, depending on capabilities of the UE, on whether the time resources of the downlink transmission that are FDMed with the SS block, etc.
1. A method for wireless communication at a user equipment (UE), comprising:
receiving a synchronization signal block for a carrier, the synchronization signal block associated with synchronization signal block transmission attributes comprising a first subcarrier spacing (SCS);
identifying one or more bandwidth part (BWP) transmission attributes for transmissions within a BWP of the carrier, the one or more BWP transmission attributes comprising a second SCS;
determining whether a transmission over the BWP of the carrier is frequency division multiplexed with the synchronization signal block based at least in part on the first SCS and the second SCS, wherein the transmission is frequency division multiplexed if the first SCS is the same as the second SCS and the transmission is not frequency division multiplexed if the first SCS is different than the second SCS; and
receiving the transmission over the BWP of the carrier based at least in part on determining whether the transmission is frequency division multiplexed with the synchronization signal block.
2. The method of claim 1 , wherein the transmission comprises a downlink control channel transmission.
3. The method of claim 1 , wherein the transmission comprises a downlink shared channel transmission.
4. The method of claim 1 , wherein the synchronization signal block transmission attributes comprise a beam identifier of the synchronization signal block.
5. The method of claim 1 , wherein the one or more BWP transmission attributes comprise a transmission beam direction or a reception beam direction.
6. The method of claim 1 , wherein the one or more BWP transmission attributes are identified based at least in part on a signal received from the carrier.
7. The method of claim 1 , wherein the first SCS is 120 kHz or 240 kHz.
8. The method of claim 1 , wherein the second SCS is 120 kHz.
9. The method of claim 1 , wherein the transmission comprises a downlink control information transmission.
10. The method of claim 1 , wherein the transmission is associated with remaining minimum system information.
11. The method of claim 1 , wherein the transmission is time division multiplexed with the synchronization signal block if the first SCS is different than the second SCS.
12. The method of claim 1 , further comprising:
determining that a second transmission over the BWP of the carrier is frequency division multiplexed with the synchronization signal block based at least in part on the first SCS being different than the second SCS;
receiving the second transmission over the BWP of the carrier based at least in part on determining that the second transmission is frequency division multiplexed with synchronization signal block.
13. The method of claim 12 , wherein the second transmission comprises a downlink shared channel transmission.
14. The method of claim 12 , wherein the second transmission is associated with remaining minimum system information.
15. The method of claim 12 , wherein a guard band in the frequency domain is included between the second transmission and the synchronization signal block.
16. An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive a synchronization signal block for a carrier, the synchronization signal block associated with synchronization signal block transmission attributes comprising a first subcarrier spacing (SCS);
identify one or more bandwidth part (BWP) transmission attributes for transmissions within a BWP of the carrier, the one or more BWP transmission attributes comprising a second SCS;
determine whether a transmission over the BWP of the carrier is frequency division multiplexed with the synchronization signal block based at least in part on the first SCS and the second SCS, wherein the transmission is frequency division multiplexed if the first SCS is the same as the second SCS and the transmission is not frequency division multiplexed if the first SCS is different than the second SCS; and
receive the transmission over the BWP of the carrier based at least in part on determining whether the transmission is frequency division multiplexed with the synchronization signal block.
17. The apparatus of claim 16 , wherein the transmission comprises a downlink control channel transmission or comprises a downlink shared channel transmission.
18. The apparatus of claim 16 , wherein the synchronization signal block transmission attributes comprise a beam identifier of the synchronization signal block.
19. The apparatus of claim 16 , wherein the one or more BWP transmission attributes comprise a transmission beam direction or a reception beam direction.
20. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to:
receive a synchronization signal block for a carrier, the synchronization signal block associated with synchronization signal block transmission attributes comprising a first subcarrier spacing (SCS);
identify one or more bandwidth part (BWP) transmission attributes for transmissions within a BWP of the carrier, the one or more BWP transmission attributes comprising a second SCS;
determine whether a transmission over the BWP of the carrier is frequency division multiplexed with the synchronization signal block based at least in part on the first SCS and the second SCS, wherein the transmission is frequency division multiplexed if the first SCS is the same as the second SCS and the transmission is not frequency division multiplexed if the first SCS is different than the second SCS; and
receive the transmission over the BWP of the carrier based at least in part on determining whether the transmission is frequency division multiplexed with the synchronization signal block.