Uplink transmission (UL Tx) preparation time
Certain aspects of the present disclosure provide techniques for uplink scheduling for communication on an uplink from a user equipment (UE) to a base station (BS). The uplink scheduling is based on uplink transmission (UL Tx) switching time and/or uplink data preparation time of the UE. The uplink data preparation time is calculated based on the UL Tx switching time. For example, a UE can report to a BS at least one of an indication of a UL Tx switching time and an uplink data preparation time of the UE. In return, the UE can receive an indication of uplink scheduling from the BS, which the UE can use to communicate with the BS.
1. A method for wireless communication by a user equipment (UE), the method comprising:
reporting, to a network node, a first indication of uplink transmission (UL Tx) switching time of the UE for a first communication frequency and an uplink data preparation time, wherein the UL Tx switching time is a time for the UE to switch between transmitting on different frequency bands, and wherein the uplink data preparation time is an amount of time between an end of a downlink reception and a start of an uplink transmission by the UE;
reporting a second indication of UL Tx switching time for a second communication frequency, the second indication of UL Tx switching time being different than the first indication of UL Tx switching time;
receiving an indication of uplink scheduling from the network node for the first communication frequency or the second communication frequency based on the reporting; and
communicating with the network node based on the uplink scheduling.
2. The method of claim 1 , wherein the UL Tx switching time comprises a number of symbols.
3. The method of claim 1 , wherein the UL Tx switching time comprises a time value.
4. The method of claim 1 , wherein the UL Tx switching time is based on a subcarrier spacing (SCS) used by the UE for uplink transmission to the network node.
5. The method of claim 1 , wherein the reported first indication of UL Tx switching time comprises an index from a plurality of indices, each index in the plurality of indices mapping a value of the index to a corresponding time value.
6. The method of claim 1 , wherein:
a first value is based on a processing capability of the UE, a delay of cross carrier scheduling of the UE, a subcarrier spacing (SCS) used by the UE, and an uplink channel structure of an uplink channel used by the UE to transmit to the network node;
a second value is based on a bandwidth part (BWP) switching time of the UE;
a third value is a sum of the first value and the UL Tx switching time; and
the uplink data preparation time of the UE is calculated based on a maximum of the second value and the third value.
7. The method of claim 1 , wherein the reporting comprises reporting the first indication of UL Tx switching time for a plurality of frequency bands.
8. A method for wireless communication by a network node, the method comprising:
receiving, from a user equipment (UE), a report of a first indication of uplink transmission (UL Tx) switching time of the UE for a first communication frequency and an uplink data preparation time of the UE, wherein the UL Tx switching time is a time for the UE to switch between transmitting on different frequency bands, and wherein the uplink data preparation time is an amount of time between an end of a downlink reception and a start of an uplink transmission by the UE;
receiving a report of a second indication of UL Tx switching time for a second communication frequency, the second indication of UL Tx switching time being different than the first indication of UL Tx switching time;
determining uplink scheduling for the UE for the first communication frequency or the second communication frequency based on the report;
transmitting an indication of the uplink scheduling to the UE; and
communicating with the UE based on the uplink scheduling.
9. The method of claim 8 , wherein the UL Tx switching time comprises a number of symbols.
10. The method of claim 8 , wherein the UL Tx switching time comprises a time value.
11. The method of claim 8 , wherein the UL Tx switching time is based on a subcarrier spacing (SCS) used by the UE for uplink transmission to the network node.
12. The method of claim 8 , wherein the reported first indication of UL Tx switching time comprises an index from a plurality of indices, each index in the plurality of indices mapping a value of the index to a corresponding time value.
13. The method of claim 8 , wherein:
a first value is based on a processing capability of the UE, a delay of cross carrier scheduling of the UE, a subcarrier spacing (SCS) used by the UE, and an uplink channel structure of an uplink channel used by the UE to transmit to the network node;
a second value is based on a bandwidth part (BWP) switching time of the UE; a third value is a sum of the first value and the UL Tx switching time; and
the uplink data preparation time of the UE is calculated based on a maximum of the second value and the third value.
14. The method of claim 8 , wherein the report comprises a report of the first indication of UL Tx switching time for a plurality of frequency bands.
15. A user equipment (UE) configured for wireless communications, comprising:
a memory comprising computer-executable instructions; and
one or more processors configured to execute the computer-executable instructions and cause the UE to:
report, to a network node, a first indication of uplink transmission (UL Tx) switching time of the UE for a first communication frequency and an uplink data preparation time, wherein the UL Tx switching time is a time for the UE to switch between transmitting on different frequency bands, and wherein the uplink data preparation time is an amount of time between an end of a downlink reception and a start of an uplink transmission by the UE;
report a second indication of UL Tx switching time for a second communication frequency, the second indication of UL Tx switching time being different than the first indication of UL Tx switching time;
receive an indication of uplink scheduling from the network node for the first communication frequency or the second communication frequency based on the reporting; and
communicate with the network node based on the uplink scheduling.
16. The UE of claim 15 , wherein the UL Tx switching time comprises a number of symbols.
17. The UE of claim 15 , wherein the UL Tx switching time comprises a time value.
18. The UE of claim 15 , wherein the UL Tx switching time is based on a subcarrier spacing (SCS) used by the UE for uplink transmission to the network node.
19. The UE of claim 15 , wherein the reported first indication of UL Tx switching time comprises an index from a plurality of indices, each index in the plurality of indices mapping a value of the index to a corresponding time value.
20. The UE of claim 15 , wherein:
a first value is based on a processing capability of the UE, a delay of cross carrier scheduling of the UE, a subcarrier spacing (SCS) used by the UE, and an uplink channel structure of an uplink channel used by the UE to transmit to the network node;
a second value is based on a bandwidth part (BWP) switching time of the UE; a third value is a sum of the first value and the UL Tx switching time; and
the uplink data preparation time of the UE is calculated based on a maximum of the second value and the third value.
21. A network node configured for wireless communications, comprising:
a memory comprising computer-executable instructions; and
one or more processors configured to execute the computer-executable instructions and cause the network node to:
receive, from a user equipment (UE), a report of a first indication of uplink transmission (UL Tx) switching time of the UE for a first communication frequency and an uplink data preparation time, wherein the UL Tx switching time is a time for the UE to switch between transmitting on different frequency bands, and wherein the uplink data preparation time is an amount of time between an end of a downlink reception and a start of an uplink transmission by the UE;
receive a report of a second indication of UL Tx switching time for a second communication frequency, the second indication of UL Tx switching time being different than the first indication of UL Tx switching time;
determine uplink scheduling for the UE for the first communication frequency or the second communication frequency based on the report;
transmit an indication of the uplink scheduling to the UE; and
communicate with the UE based on the uplink scheduling.
22. The network node of claim 21 , wherein the UL Tx switching time comprises a number of symbols.
23. The network node of claim 21 , wherein the UL Tx switching time comprises a time value.
24. The network node of claim 21 , wherein the UL Tx switching time is based on a subcarrier spacing (SCS) used by the UE for uplink transmission to the network node.
25. The network node of claim 21 , wherein the reported first indication of UL Tx switching time comprises an index from a plurality of indices, each index in the plurality of indices mapping a value of the index to a corresponding time value.
26. The network node of claim 21 , wherein:
a first value is based on a processing capability of the UE, a delay of cross carrier scheduling of the UE, a subcarrier spacing (SCS) used by the UE, and an uplink channel structure of an uplink channel used by the UE to transmit to the network node;
a second value is based on a bandwidth part (BWP) switching time of the UE;
a third value is a sum of the first value and the UL Tx switching time; and
the uplink data preparation time of the UE is calculated based on a maximum of the second value and the third value.
27. A non-transitory computer readable medium storing instructions that, when executed by a processor of a user equipment (UE), cause the UE to:
report, to a network node, a first indication of uplink transmission (UL Tx) switching time of the UE for a first communication frequency and an uplink data preparation time, wherein the UL Tx switching time is a time for the UE to switch between transmitting on different frequency bands, and wherein the uplink data preparation time is an amount of time between an end of a downlink reception and a start of an uplink transmission by the UE;
report a second indication of UL Tx switching time for a second communication frequency, the second indication of UL Tx switching time being different than the first indication of UL Tx switching time;
receive an indication of uplink scheduling from the network node for the first communication frequency or the second communication frequency based on the reporting; and
communicate with the network node based on the uplink scheduling.