Techniques for intra-user equipment and inter-user equipment cancelation of overlapping communications
Methods, systems, and devices for wireless communications are described. Wireless communications systems may employ one or more scheduling constraints to support efficient utilization of techniques for intra-device handling of overlapping scheduled uplink transmissions (e.g., intra-device dynamic resource cancelation and multiplexing) as well as inter-device handling of overlapping scheduled uplink transmissions (e.g., inter-device dynamic resource cancelation and multiplexing). Scheduling constraints may define how a device may apply intra-device and inter-device multiplexing and cancelation rules for various scenarios. For example, a device may apply intra-UE cancelation rules before inter-device cancelation rules. In some examples, later-received grants or uplink preemption indications (ULPIs) may not change a device's previously established decision to drop an uplink transmission. As another example, a device may not expect to receive a grant for an uplink transmission that would arise in subsequent cancelation of that uplink transmission due to a previously-received grant or previously-received ULPI.
1 . A method for wireless communication at a user equipment (UE), comprising:
receiving a first grant for a first uplink transmission scheduled for transmission by the UE;
identifying that the first uplink transmission at least partially overlaps with a second uplink transmission also scheduled for transmission by the UE;
determining to drop the second uplink transmission based at least in part on a first scheduling constraint, wherein the first scheduling constraint is that the first uplink transmission has a first priority that is greater than a second priority of the second uplink transmission;
transmitting uplink data transmissions in accordance with a second scheduling constraint, wherein the second scheduling constraint relates to an additional uplink transmission scheduled by an additional grant, the additional uplink transmission scheduled to at least partially overlap with the first uplink transmission;
receiving the additional grant; and
ignoring the received additional grant based at least in part on the second scheduling constraint until overlapping between the first uplink transmission and the second uplink transmission is resolved, wherein the second uplink transmission is dropped based at least in part on the ignoring.
2 . The method of claim 1 , further comprising:
receiving the additional grant for the additional uplink transmission scheduled for transmission by the UE; and
determining to drop the first uplink transmission based at least in part on the additional uplink transmission at least partially overlapping with the first uplink transmission, wherein the second uplink transmission and the additional uplink transmission are non-overlapping.
3 . The method of claim 2 , wherein transmitting the uplink data transmissions in accordance with the second scheduling constraint comprises:
piggybacking at least a portion of the first uplink transmission on to the additional uplink transmission based at least in part on the determination to drop the first uplink transmission; and
transmitting the additional uplink transmission and the piggybacked portion of the first uplink transmission, wherein the determination to drop the second uplink transmission is maintained based at least in part on the second scheduling constraint.
4 . The method of claim 1 , wherein the first uplink transmission comprises a high priority uplink control channel transmission or a high priority uplink shared channel transmission.
5 . The method of claim 1 , wherein the second uplink transmission comprises a low priority uplink control channel transmission, a low priority uplink shared channel transmission, or a sounding reference signal transmission.
6 . The method of claim 1 , wherein the additional uplink transmission comprises an additional high priority uplink transmission.
7 . A method for wireless communication at a user equipment (UE), comprising:
identifying that a first uplink transmission scheduled for transmission by the UE at least partially overlaps with a second uplink transmission scheduled for transmission by the UE, wherein the first uplink transmission is of a first priority that is greater than a second priority of the second uplink transmission;
receiving control signaling comprising an uplink cancelation indication associated with the first uplink transmission; and
applying the uplink cancelation indication after resolving overlapping between the first uplink transmission and the second uplink transmission.
8 . The method of claim 7 , wherein resolving overlapping between the first uplink transmission and the second uplink transmission comprises canceling the second uplink transmission based at least in part on the first priority of the first uplink transmission being greater than the second priority of the second uplink transmission.
9 . An apparatus for wireless communication at a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
receive a first grant for a first uplink transmission scheduled for transmission by the UE;
identify that the first uplink transmission at least partially overlaps with a second uplink transmission also scheduled for transmission by the UE;
determine to drop the second uplink transmission based at least in part on a first scheduling constraint, wherein the first scheduling constraint is that the first uplink transmission has a first priority that is greater than a second priority of the second uplink transmission;
transmit uplink data transmissions in accordance with a second scheduling constraint, wherein the second scheduling constraint relates to an additional uplink transmission scheduled by an additional grant, the additional uplink transmission scheduled to at least partially overlap with the first uplink transmission;
receive the additional grant; and
ignore the received additional grant based at least in part on the second scheduling constraint until overlapping between the first uplink transmission and the second uplink transmission is resolved, wherein the second uplink transmission is dropped based at least in part on the ignoring.
10 . The apparatus of claim 9 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive the additional grant for the additional uplink transmission scheduled for transmission by the UE; and
determine to drop the first uplink transmission based at least in part on the additional uplink transmission at least partially overlapping with the first uplink transmission, wherein the second uplink transmission and the additional uplink transmission are non-overlapping.
11 . The apparatus of claim 10 , wherein the instructions to transmit the uplink data transmissions in accordance with the second scheduling constraint are executable by the processor to cause the apparatus to:
piggyback at least a portion of the first uplink transmission on to the additional uplink transmission based at least in part on the determination to drop the first uplink transmission; and
transmit the additional uplink transmission and the piggybacked portion of the first uplink transmission, wherein the determination to drop the second uplink transmission is maintained based at least in part on the second scheduling constraint.
12 . The apparatus of claim 9 , wherein the first uplink transmission comprises a high priority uplink control channel transmission or a high priority uplink shared channel transmission.
13 . The apparatus of claim 9 , wherein the second uplink transmission comprises a low priority uplink control channel transmission, a low priority uplink shared channel transmission, or a sounding reference signal transmission.
14 . The apparatus of claim 9 , wherein the additional uplink transmission comprises an additional high priority uplink transmission.
15 . An apparatus for wireless communication at a base station, comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
transmit a first grant for a first uplink transmission scheduled for transmission by a user equipment (UE);
identify that the first uplink transmission at least partially overlaps with a second uplink transmission also scheduled for transmission by the UE;
determine the second uplink transmission will be dropped by the UE based at least in part on a first scheduling constraint, wherein the first scheduling constraint is that the first uplink transmission has a first priority that is greater than a second priority of the second uplink transmission;
transmit an additional grant in accordance with a second scheduling constraint, wherein the second scheduling constraint relates to an additional uplink transmission scheduled by the additional grant, the additional uplink transmission scheduled to at least partially overlap with the first uplink transmission; and
determine the transmitted additional grant will be ignored by the UE and that the second uplink transmission is dropped based at least in part on the second scheduling constraint until overlapping between the first uplink transmission and the second uplink transmission is resolved.
16 . The apparatus of claim 15 , wherein the instructions are further executable by the processor to cause the apparatus to:
determine the first uplink transmission will be dropped by the UE based at least in part on transmitting the additional grant; and
receive the additional uplink transmission and a piggybacked portion of the first uplink transmission.
17 . The apparatus of claim 15 , wherein the first uplink transmission comprises a high priority uplink control channel transmission or a high priority uplink shared channel transmission, wherein the second uplink transmission comprises a low priority uplink control channel transmission, a low priority uplink shared channel transmission, or a sounding reference signal transmission, and wherein the additional uplink transmission comprises an additional high priority uplink transmission.