Modulation and coding scheme capability for high band wireless communication
Aspects presented herein may enable a UE to limit MCS and/or K1 offset used for communicating with a base station to a threshold based at least in part on an SCS used for the communication. In one aspect, a UE limit at least one of an MCS to being less than or equal to an MCS threshold or a K1 offset to being greater than or equal to a K1 offset threshold based on a subcarrier spacing selected for communication with a base station, the K1 offset being a number of slots between receiving DL data and transmitting ACK/NACK feedback. The UE communicate with the base station based at least on one of the MCS being less than or equal to the MCS threshold or the K1 offset being greater than or equal to the K1 offset threshold.
1. An apparatus of wireless communication at a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory and configured to:
limit a modulation and coding scheme (MCS) for a communication with a base station to less than or equal to 16-quadrature amplitude modulation (16-QAM) when a communication frequency for the communication is above 52.6 GHz and a subcarrier spacing selected for the communication is 120 KHz or below;
transmit, to the base station, a capability message indicating a maximum MCS that the UE can support is the 16-QAM when the communication is above the 52.6 GHz and the subcarrier spacing selected for the communication is the 120 KHz or below; and
communicate with the base station using the MCS that is less than or equal to the 16-QAM when the communication is above the 52.6 GHz and the subcarrier spacing selected for the communication is the 120 KHz or below.
2. The apparatus of claim 1 , wherein the at least one processor and the memory are further configured to:
measure inter-carrier interference (ICI) when communicating with the base station, wherein limitation of the MCS to less than or equal to the 16-QAM is further based on the ICI being greater than an ICI threshold.
3. The apparatus of claim 1 , wherein the capability message further indicates an overhead parameter associated with the MCS.
4. The apparatus of claim 3 , wherein the at least one processor and the memory are further configured to:
select the overhead parameter based on a phase tracking reference signal (PT-RS) density.
5. The apparatus of claim 3 , wherein the at least one processor and the memory are further configured to:
select the overhead parameter based on a used MCS.
6. The apparatus of claim 3 , wherein the at least one processor and the memory are further configured to:
select the overhead parameter based on a physical resource block (PRB) allocation associated with the communication.
7. The apparatus of claim 1 , wherein the at least one processor and the memory are further configured to:
receive, from the base station, scheduling for the communication, the scheduling being based on the capability message.
8. A method of wireless communication of at user equipment (UE), comprising:
limiting a modulation and coding scheme (MCS) for a communication with a base station to less than or equal to 16-quadrature amplitude modulation (16-QAM) when a communication frequency for the communication is above 52.6 GHz and a subcarrier spacing selected for the communication is 120 KHz or below;
transmitting, to the base station, a capability message indicating a maximum MCS that the UE can support is the 16-QAM when the communication is above the 52.6 GHz and the subcarrier spacing selected for the communication is the 120 KHz or below; and
communicating with the base station using the MCS that is less than or equal to the 16-QAM when the communication is above the 52.6 GHz and the subcarrier spacing selected for the communication is the 120 KHz or below.
9. The method of claim 8 , further comprising measuring inter-carrier interference (ICI) when communicating with the base station, wherein limitation of the MCS to less than or equal to the 16-QAM is further based on the ICI being greater than an ICI threshold.
10. The method of claim 8 , wherein the capability message further indicates an overhead parameter associated with the MCS.
11. The method of claim 10 , further comprising:
selecting the overhead parameter based on a phase tracking reference signal (PT-RS) density.
12. The method of claim 10 , further comprising:
selecting the overhead parameter based on a used MCS.
13. The method of claim 10 , further comprising:
selecting the overhead parameter based on a physical resource block (PRB) allocation associated with the communication.
14. The method of claim 8 , further comprising:
receiving, from the base station, scheduling for the communication, the scheduling being based on the capability message.
15. An apparatus for wireless communication at a base station, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive, from a user equipment (UE), a capability message indicating a maximum modulation and coding scheme (MCS) that the UE can support is 16-quadrature amplitude modulation (16-QAM) when communicating above 52.6 GHz and a subcarrier spacing selected for the communication is 120 KHz or below; and
communicate with the UE using an MCS being that is less than or equal to the 16-QAM when the communication is above the 52.6 GHZ and the subcarrier spacing selected for the communication is the 120 KHz or below.
16. The apparatus of claim 15 , wherein the capability message further indicates an overhead parameter associated with the maximum MCS.
17. The apparatus of claim 16 , wherein the at least one processor and the memory are further configured to select a size for a transport block (TB) for communicating with the UE based on the overhead parameter, wherein the communication with the UE is based on the size for the TB.
18. The apparatus of claim 16 , wherein the at least one processor and the memory are further configured to transmit phase tracking reference signal (PT-RS) to the UE, the overhead parameter being based on a PT-RS density of the PT-RS.
19. The apparatus of claim 16 , wherein the at least one processor and the memory are further configured to transmit, to the UE, scheduling for the communication, the scheduling being based on the received capability message.
20. A method of wireless communication at a base station, comprising:
receiving, from a user equipment (UE), a capability message indicating a maximum modulation and coding scheme (MCS) that the UE can support is 16-quadrature amplitude modulation (16-QAM) when communicating above 52.6 GHz and a subcarrier spacing selected for the communication is 120 KHz or below; and
communicating with the UE using an MCS that is less than or equal to the 16-QAM when the communication is above the 52.6 GHz and the subcarrier spacing selected for the communication is the 120 KHz or below.
21. The method of claim 20 , wherein the capability message further indicates an overhead parameter associated with the maximum MCS.
22. The method of claim 21 , further comprising selecting a size for a transport block (TB) for communicating with the UE based on the overhead parameter, wherein the communication with the UE is based on the size for the TB.
23. The method of claim 21 , further comprising transmitting phase tracking reference signal (PT-RS) to the UE, the overhead parameter being based on a PT-RS density of the PT-RS.
24. The method of claim 21 , further comprising transmitting, to the UE, scheduling for the communication, the scheduling being based on the received capability message.