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 . 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 dynamically scheduled for transmission by the UE;
receive a second grant for a second uplink transmission dynamically scheduled for transmission by the UE;
determine that the first uplink transmission and the second uplink transmission are scheduled so as to trigger activation of a dynamic scheduling rule that is based at least in part on a first priority of the first uplink transmission being greater than a second priority of the second uplink transmission, the dynamic scheduling rule further based on whether the first uplink transmission overlaps with the second uplink transmission, wherein the dynamic scheduling rule indicates that the UE is permitted to disregard a grant dynamically scheduling a low priority uplink transmission that overlaps with a previously dynamically scheduled high priority uplink transmission; and
transmit the first uplink transmission based at least in part on the dynamic scheduling rule.
2 . The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to:
identify that the UE has data to be included in the first uplink transmission, wherein the first uplink transmission is transmitted based at least in part on the UE having data to be included in the first uplink transmission.
3 . The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to:
discard the received second grant based at least in part on the dynamic scheduling rule, wherein the first uplink transmission is transmitted based at least in part on the discarding.
4 . The apparatus of claim 1 , wherein the first uplink transmission comprises a high priority scheduling request or a high priority uplink configured grant transmission.
5 . The apparatus of claim 1 , wherein the dynamic scheduling rule is based at least in part on the first uplink transmission and the second uplink transmission being overlapping.
6 . The apparatus of claim 1 , wherein the first uplink transmission comprises a hybrid automatic repeat request acknowledgment transmission that is to be transmitted in response to a semi-persistently scheduled physical downlink shared channel transmission.
7 . The apparatus of claim 1 , wherein the first uplink transmission comprises a semi-persistent channel state information transmission.
8 . 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 dynamically scheduled for transmission by a user equipment (UE);
identify a dynamic scheduling rule based at least in part on a first priority of the first uplink transmission being greater than a second priority of a second uplink transmission to be scheduled by a second grant, wherein the dynamic scheduling rule indicates that the UE is permitted to disregard a grant dynamically scheduling a low priority uplink transmission that overlaps with a previously dynamically scheduled high priority uplink transmission; and
transmit the second grant in accordance with the dynamic scheduling rule.
9 . The apparatus of claim 8 , wherein the instructions are further executable by the processor to cause the apparatus to:
receive the first uplink transmission based at least in part on the transmitted first grant.
10 . The apparatus of claim 8 , wherein the dynamic scheduling rule further relates to whether the second uplink transmission is scheduled to overlap with the first uplink transmission.
11 . The apparatus of claim 8 , wherein the first uplink transmission comprises a hybrid automatic repeat request acknowledgment transmission that is to be transmitted in response to a semi-persistently scheduled physical downlink shared channel transmission or a semi-persistent channel state information transmission.