Uplink channel design for slot-based transmission time interval (TTI)
Certain aspects of the present disclosure provide techniques that may be used to help enable low latency communications between a user equipment (UE) and a base station (BS) using quick uplink channels that enable a reduced transmission time interval (TTI). An example method generally includes identifying a plurality of slots in a subframe, receiving a resource configuration for an uplink channel, wherein the resource configuration is associated with a first slot of the plurality of slots, determining a resource for transmitting the uplink channel in a second slot of the plurality of slots, wherein the resource is determined based on the resource configuration associated with the first slot of the plurality of slots, and transmitting the uplink channel in the second slot using the determined resource.
1. A method for wireless communications by a user equipment (UE), comprising:
using a first set of power control parameters for transmitting a first type of channel using a first transmission time interval (TTI) duration;
using a second set of power control parameters for transmitting a second type of channel using a second TTI duration;
detecting that the UE is scheduled to transmit, within a same subframe, the first type of channel having the first transmission time interval (TTI) duration spanning at least two slots of the subframe and the second type of channel having the second transmission time interval (TTI) duration spanning a single slot of the subframe; and
deciding, based on one or more conditions, whether to transmit the first type of channel, the second type of channel, or both, within the subframe.
2. The method of claim 1 , wherein the first set of power control parameters and second set of power control parameters implement the same closed loop power control parameters.
3. The method of claim 2 , wherein the first set of power control parameters includes a first set of open loop power control parameters and the second set of power control parameters includes a second set of open loop power control parameters.
4. The method of claim 1 , wherein the first set of power control parameters include a first set of closed loop power control parameters and the second set of power control parameters include a second set of closed loop power control parameters.
5. The method of claim 4 , wherein an open loop power control parameter associated with the second set of power control parameters comprises an adjustment from an open loop power control parameter associated with the first set of power control parameters.
6. The method of claim 1 , wherein the first type of channel comprises a physical uplink control channel (PUCCH) and the second type of channel comprises a quick physical uplink shared channel (QPUSCH).
7. The method of claim 6 , wherein the first type of channel is transmitted in a first slot of the subframe and the first and second types of channels are transmitted in a second slot of the subframe.
8. The method of claim 6 , wherein the first type of channel is transmitted in a first slot of the subframe, and the second type of channel, but not the first type of channel, is transmitted in a second slot of the subframe.
9. The method of claim 8 , wherein the second type of channel includes uplink control information (UCI) originally intended to be transmitted on the first type of channel.
10. The method of claim 9 , wherein at least part of the UCI is dropped.
11. An apparatus, comprising:
a processor configured to:
use a first set of power control parameters for transmitting a first type of channel using a first transmission time interval (TTI) duration,
use a second set of power control parameters for transmitting a second type of channel using a second TTI duration,
detect that the UE is scheduled to transmit, within a same subframe, the first type of channel having the first transmission time interval (TTI) duration spanning at least two slots of the subframe and the second type of channel having the second transmission time interval (TTI) duration spanning a single slot of the subframe, and
decide, based on one or more conditions, whether to transmit the first type of channel, the second type of channel, or both, within the subframe; and
a memory coupled to the processor.
12. The apparatus of claim 11 , wherein the first set of power control parameters and second set of power control parameters implement the same closed loop power control parameters.
13. The apparatus of claim 12 , wherein the first set of power control parameters includes a first set of open loop power control parameters and the second set of power control parameters includes a second set of open loop power control parameters.
14. The apparatus of claim 11 , wherein the first set of power control parameters include a first set of closed loop power control parameters and the second set of power control parameters include a second set of closed loop power control parameters.
15. The apparatus of claim 14 , wherein an open loop power control parameter associated with the second set of power control parameters comprises an adjustment from an open loop power control parameter associated with the first set of power control parameters.
16. The apparatus of claim 15 , wherein the first type of channel is transmitted in a first slot of the subframe and the first and second types of channels are transmitted in a second slot of the subframe.
17. The apparatus of claim 15 , wherein the first type of channel is transmitted in a first slot of the subframe, and the second type of channel, but not the first type of channel, is transmitted in a second slot of the subframe.
18. The apparatus of claim 17 , wherein the second type of channel includes uplink control information (UCI) originally intended to be transmitted on the first type of channel.
19. The apparatus of claim 18 , wherein at least part of the UCI is dropped.
20. The apparatus of claim 11 , wherein the first type of channel comprises a physical uplink control channel (PUCCH) and the second type of channel comprises a quick physical uplink shared channel (QPUSCH).
21. An apparatus for wireless communications, comprising:
means for using a first set of power control parameters for transmitting a first type of channel using a first transmission time interval (TTI) duration;
means for using a second set of power control parameters for transmitting a second type of channel using a second TTI duration;
means for detecting that the UE is scheduled to transmit, within a same subframe, the first type of channel having the first transmission time interval (TTI) duration spanning at least two slots of the subframe and the second type of channel having the second transmission time interval (TTI) duration spanning a single slot of the subframe; and
means for deciding, based on one or more conditions, whether to transmit the first type of channel, the second type of channel, or both, within the subframe.
22. The apparatus of claim 21 , wherein the first set of power control parameters and second set of power control parameters implement the same closed loop power control parameters.
23. The apparatus of claim 21 , wherein the first type of channel comprises a physical uplink control channel (PUCCH) and the second type of channel comprises a quick physical uplink shared channel (QPUSCH).
24. A non-transitory computer-readable medium having instructions stored thereon which, when executed by a processor, performs a method for wireless communications by a user equipment, the method comprising:
using a first set of power control parameters for transmitting a first type of channel using a first transmission time interval (TTI) duration;
using a second set of power control parameters for transmitting a second type of channel using a second TTI duration;
detecting that the UE is scheduled to transmit, within a same subframe, the first type of channel having the first transmission time interval (TTI) duration spanning at least two slots of the subframe and the second type of channel having the second transmission time interval (TTI) duration spanning a single slot of the subframe; and
deciding, based on one or more conditions, whether to transmit the first type of channel, the second type of channel, or both, within the subframe.