Techniques for sharing transmission power during handover in wireless communications
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for cancelling transmissions during handover operations. In one aspect, a user equipment (UE) can cancel at least a portion of a first uplink transmission where the first uplink transmission overlaps with a second uplink transmission scheduled by a target cell in a dual active protocol stack (DAPS)-based handover (HO). In another aspect, a network can receive, from the UE, a capability indicating whether cancelling uplink transmission from a source cell in DAPS-based HO is supported, and the network can schedule an uplink transmission for the UE during the DAPS-based HO to the target cell based on the capability.
1. An apparatus for wireless communication, comprising:
a memory configured to store instructions; and
one or more processors configured to execute the instructions and cause the apparatus to:
output for transmission, to a source cell, a capability indicating whether cancelling uplink transmission to the source cell in dual active protocol stack (DAPS)-based handover (HO) is supported;
obtain, from the source cell, an uplink grant scheduling a first uplink transmission during the DAPS-based HO; and
if the first uplink transmission overlaps with a second uplink transmission scheduled by a target cell, cancel at least a portion of the first uplink transmission.
2. The apparatus of claim 1 , wherein the first uplink transmission and the second uplink transmission are in overlapping time resources.
3. The apparatus of claim 1 , wherein the one or more processors further cause the apparatus to cancel at least the portion of the first uplink transmission based on a cancellation timeline.
4. The apparatus of claim 1 , wherein the one or more processors further cause the apparatus to, if the first uplink transmission overlaps with the second uplink transmission scheduled by the target cell and where the capability indicates that cancelling uplink transmission to the source cell in DAPS-based HO is supported, output the second uplink transmission for transmission to the target cell.
5. The apparatus of claim 1 , wherein the one or more processors further cause the apparatus to cancel at least the portion of the first uplink transmission where the apparatus does not indicate a second capability for power sharing.
6. The apparatus of claim 1 , wherein the one or more processors further cause the apparatus to cancel at least the portion of the first uplink transmission where the apparatus does not receive an indication of power sharing.
7. The apparatus of claim 1 , wherein the one or more processors further cause the apparatus to, if the first uplink transmission overlaps with the second uplink transmission scheduled by the target cell and where the capability indicates that cancelling uplink transmission to the source cell in DAPS-based HO is not supported, indicate, to at least the source cell, a configuration error.
8. The apparatus of claim 7 , wherein the one or more processors further cause the apparatus to indicate the configuration error where the apparatus does not indicate a second capability for power sharing.
9. The apparatus of claim 7 , wherein the one or more processors further cause the apparatus to indicate the configuration error where the apparatus does not receive an indication of power sharing.
10. The apparatus of claim 1 , wherein the capability indicates, per band combination for inter-frequency DAPS-based HO, whether cancelling uplink transmission to the source cell is supported.
11. The apparatus of claim 1 , further comprising a transceiver that is configured to at least one of transmit the capability or receive the uplink grant, wherein the apparatus is configured as a user equipment (UE).
12. An apparatus for wireless communication, comprising:
a memory configured to store instructions; and
one or more processors configured to execute the instructions and cause the apparatus to:
obtain, from a user equipment (UE), a capability indicating whether cancelling uplink transmission from a source cell in dual active protocol stack (DAPS)-based handover (HO) is supported; and
if the capability indicates that cancelling uplink transmission from the source cell in DAPS-based HO is supported, scheduling, for the UE, an uplink transmission during a DAPS-based HO to a target cell.
13. The apparatus of claim 12 , wherein the one or more processors are further configured to, where the capability indicates that cancelling uplink transmission from the source cell in DAPS-based HO is not supported, refrain from scheduling, for the UE, the uplink transmission where the uplink transmission overlaps with a second uplink transmission scheduled by a target cell for the UE during the DAPS-based HO.
14. The apparatus of claim 13 , wherein the uplink transmission and the second uplink transmission are in overlapping time resources.
15. The apparatus of claim 13 , wherein the one or more processors further cause the apparatus to refrain from scheduling the uplink transmission where the UE transmits a second capability for power sharing.
16. The apparatus of claim 13 , wherein the one or more processors further cause the apparatus to refrain from scheduling the uplink transmission where the apparatus transmits, to the UE, an indication of power sharing.
17. The apparatus of claim 12 , wherein the capability indicates, per band combination for inter-frequency DAPS-based HO, whether cancelling uplink transmission to the source cell is supported.
18. The apparatus of claim 12 , further comprising a transceiver that is configured to receive the capability, wherein the apparatus is configured as a base station.
19. A method for wireless communications at an apparatus of a user equipment (UE), comprising:
outputting for transmission to a source cell, a capability indicating whether cancelling uplink transmission to the source cell in dual active protocol stack (DAPS)-based handover (HO) is supported;
obtaining, from the source cell, an uplink grant scheduling a first uplink transmission during the DAPS-based HO; and
if the first uplink transmission overlaps with a second uplink transmission scheduled by a target cell, cancelling at least a portion of the first uplink transmission.
20. The method of claim 19 , wherein the first uplink transmission and the second uplink transmission are in overlapping time resources.
21. The method of claim 19 , wherein cancelling at least the portion of the first uplink transmission is based on a cancellation timeline.
22. The method of claim 19 , where the first uplink transmission overlaps with the second uplink transmission scheduled by the target cell and where the capability indicates that cancelling uplink transmission to the source cell in DAPS-based HO is supported, outputting the second uplink transmission for transmission to the target cell.
23. The method of claim 19 , wherein cancelling at least the portion of the first uplink transmission is performed where the UE does not indicate a second capability for power sharing.
24. The method of claim 19 , wherein cancelling at least the portion of the first uplink transmission is performed where the UE does not receive an indication of power sharing.
25. The method of claim 19 further comprising, where the first uplink transmission overlaps with the second uplink transmission scheduled by the target cell and where the capability indicates that cancelling uplink transmission to the source cell in DAPS-based HO is not supported, indicating, to at least the source cell, a configuration error.
26. The method of claim 25 , wherein indicating the configuration error is performed where the UE does not indicate a second capability for power sharing.
27. The method of claim 25 , wherein indicating the configuration error is performed where the UE does not receive an indication of power sharing.
28. The method of claim 19 , wherein the capability indicates, per band combination for inter-frequency DAPS-based HO, whether cancelling uplink transmission to the source cell is supported.
29. A method for wireless communications at an apparatus of a network, comprising:
obtaining, from a user equipment (UE), a capability indicating whether cancelling uplink transmission from a source cell in dual active protocol stack (DAPS)-based handover (HO) is supported; and
if the capability indicates that cancelling uplink transmission from the source cell in DAPS-based HO is supported, scheduling, for the UE, an uplink transmission during a DAPS-based HO to a target cell.
30. The method of claim 29 , wherein the capability indicates, per band combination for inter-frequency DAPS-based HO, whether cancelling uplink transmission to the source cell is supported.