Physical shared channel transmission to acknowledgement delay optimization
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive data in a downlink transmission from a base station. After the UE successfully processes the data, the UE may select a transmit time interval (TTI) in which to send an acknowledgement (ACK) of the data to the base station. In some examples, the UE may select the TTI based on a delay that is a function of the processing abilities of the UE. Additionally or alternatively, the UE may select the TTI based on a delay that is a function of the transmission parameters of the downlink transmission. After selecting the TTI, the UE may send the ACK to the base station in the selected TTI.
1. A method for wireless communication, comprising:
identifying, by a user equipment (UE), a capability of the UE to process transmissions, wherein the capability is associated with a quantity of symbols for the UE to process the transmissions;
transmitting, to a base station, an indication of the UE's capability to process transmissions;
receiving a first physical channel transmission from the base station in a first transmission time interval (TTI); and
communicating a second physical channel transmission with the base station in a second TTI, wherein the second TTI is determined based on the first TTI and the indicated capability of the UE to process transmissions.
2. The method of claim 1 , wherein the first physical channel transmission comprises a physical downlink shared channel (PDSCH) transmission and communicating the second physical channel transmission comprises transmitting an acknowledgement (ACK) message for the PDSCH transmission.
3. The method of claim 2 , wherein the indication of the UE's capability to process transmissions indicates that the UE is able to transmit the ACK message with a transmission delay that is smaller than a default transmission delay for transmitting ACK messages.
4. The method of claim 2 , wherein the indication of the UE's capability to process transmissions comprises a maximum ACK delay value supported by the UE.
5. The method of claim 1 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises receiving a physical downlink shared channel (PDSCH) transmission.
6. The method of claim 1 , wherein the indication of the UE's capability to process transmissions indicates a processing capability of the UE associated with one or more transport block sizes, a processing capability of the UE associated with a number of transmission layers, a processing capability of the UE associated with one or more transmission modes, or a combination thereof.
7. The method of claim 1 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises transmitting a physical uplink shared channel (PUSCH) transmission.
8. The method of claim 7 , wherein the indication of the UE's capability to process transmissions indicates a capability of the UE to encode the PUSCH transmission.
9. The method of claim 1 , further comprising:
determining a change in the UE's capability to process transmissions; and
transmitting, to the base station, a second indication of the UE's capability to process transmissions, the second indication reflecting the change in the UE's capability to process transmissions.
10. The method of claim 1 , wherein the UE comprises a Narrowband Internet of Things (NB-IoT) device.
11. An apparatus for wireless communication, comprising:
means for identifying, by a user equipment (UE), a capability of the UE to process transmissions, wherein the capability is associated with a quantity of symbols for the UE to process the transmissions;
means for transmitting, to a base station, an indication of the UE's capability to process transmissions;
means for receiving a first physical channel transmission from the base station in a first transmission time interval (TTI); and
means for communicating a second physical channel transmission with the base station in a second TTI, wherein the second TTI is determined based on the first TTI and the indicated capability of the UE to process transmissions.
12. The apparatus of claim 11 , wherein the first physical channel transmission comprises a physical downlink shared channel (PDSCH) transmission and communicating the second physical channel transmission comprises transmitting an acknowledgement (ACK) message for the PDSCH transmission.
13. The apparatus of claim 12 , wherein the indication of the UE's capability to process transmissions indicates that the UE is able to transmit the ACK message with a transmission delay that is smaller than a default transmission delay for transmitting ACK messages.
14. The apparatus of claim 12 , wherein the indication of the UE's capability to process transmissions comprises a maximum ACK delay value supported by the UE.
15. The apparatus of claim 11 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises receiving a physical downlink shared channel (PDSCH) transmission.
16. The apparatus of claim 11 , wherein the indication of the UE's capability to process transmissions indicates a processing capability of the UE associated with one or more transport block sizes, a processing capability of the UE associated with a number of transmission layers, a processing capability of the UE associated with one or more transmission modes, or a combination thereof.
17. The apparatus of claim 11 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises transmitting a physical uplink shared channel (PUSCH) transmission.
18. The apparatus of claim 17 , wherein the indication of the UE's capability to process transmissions indicates a capability of the UE to encode the PUSCH transmission.
19. The apparatus of claim 11 , further comprising:
means for determining a change in the UE's capability to process transmissions; and
means for transmitting, to the base station, a second indication of the UE's capability to process transmissions, the second indication reflecting the change in the UE's capability to process transmissions.
20. The apparatus of claim 11 , wherein the UE comprises a Narrowband Internet of Things (NB-IoT) device or an Machine Type communication (MTC) device.
21. An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
identify, by a user equipment (UE), a capability of the UE to process transmissions, wherein the capability is associated with a quantity of symbols for the UE to process the transmissions;
transmit, to a base station, an indication of the UE's capability to process transmissions;
receive a first physical channel transmission from the base station in a first transmission time interval (TTI); and
communicate a second physical channel transmission with the base station in a second TTI, wherein the second TTI is determined based on the first TTI and the indicated capability of the UE to process transmissions.
22. The apparatus of claim 21 , wherein the first physical channel transmission comprises a physical downlink shared channel (PDSCH) transmission and communicating the second physical channel transmission comprises transmitting an acknowledgement (ACK) message for the PDSCH transmission.
23. The apparatus of claim 22 , wherein the indication of the UE's capability to process transmissions indicates that the UE is able to transmit the ACK message with a transmission delay that is smaller than a default transmission delay for transmitting ACK messages.
24. The apparatus of claim 22 , wherein the indication of the UE's capability to process transmissions comprises a maximum ACK delay value supported by the UE.
25. The apparatus of claim 21 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises receiving a physical downlink shared channel (PDSCH) transmission.
26. The apparatus of claim 21 , wherein the indication of the UE's capability to process transmissions indicates a processing capability of the UE associated with one or more transport block sizes, a processing capability of the UE associated with a number of transmission layers, a processing capability of the UE associated with one or more transmission modes, or a combination thereof.
27. The apparatus of claim 21 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises transmitting a physical uplink shared channel (PUSCH) transmission.
28. The apparatus of claim 27 , wherein the indication of the UE's capability to process transmissions indicates a capability of the UE to encode the PUSCH transmission.
29. The apparatus of claim 21 , wherein the instructions are further executable by the processor to:
determine a change in the UE's capability to process transmissions; and
transmit, to the base station, a second indication of the UE's capability to process transmissions, the second indication reflecting the change in the UE's capability to process transmissions.
30. The apparatus of claim 21 , wherein the UE comprises a Narrowband Internet of Things (NB-IoT) device or a Machine Type communication (MTC) device.
31. A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:
identify, by a user equipment (UE), a capability of the UE to process transmissions, wherein the capability is associated with a quantity of symbols for the UE to process the transmissions;
transmit, to a base station, an indication of the UE's capability to process transmissions;
receive a first physical channel transmission from the base station in a first transmission time interval (TTI); and
communicate a second physical channel transmission with the base station in a second TTI, wherein the second TTI is determined based on the first TTI and the indicated capability of the UE to process transmissions.
32. The non-transitory computer readable medium of claim 31 , wherein the first physical channel transmission comprises a physical downlink shared channel (PDSCH) transmission and communicating the second physical channel transmission comprises transmitting an acknowledgement (ACK) message for the PDSCH transmission.
33. The non-transitory computer readable medium of claim 32 , wherein the indication of the UE's capability to process transmissions indicates that the UE is able to transmit the ACK message with a transmission delay that is smaller than a default transmission delay for transmitting ACK messages.
34. The non-transitory computer readable medium of claim 32 , wherein the indication of the UE's capability to process transmissions comprises a maximum ACK delay value supported by the UE.
35. The non-transitory computer readable medium of claim 31 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises receiving a physical downlink shared channel (PDSCH) transmission.
36. The non-transitory computer readable medium of claim 31 , wherein the indication of the UE's capability to process transmissions indicates a processing capability of the UE associated with one or more transport block sizes, a processing capability of the UE associated with a number of transmission layers, a processing capability of the UE associated with one or more transmission modes, or a combination thereof.
37. The non-transitory computer readable medium of claim 31 , wherein the first physical channel transmission comprises a physical downlink control channel (PDCCH) transmission and communicating the second physical channel transmission comprises transmitting a physical uplink shared channel (PUSCH) transmission.
38. The non-transitory computer readable medium of claim 37 , wherein the indication of the UE's capability to process transmissions indicates a capability of the UE to encode the PUSCH transmission.
39. The non-transitory computer readable medium of claim 31 , wherein the instructions are further executable by the processor to:
determine a change in the UE's capability to process transmissions; and
transmit, to the base station, a second indication of the UE's capability to process transmissions, the second indication reflecting the change in the UE's capability to process transmissions.
40. The non-transitory computer readable medium of claim 31 , wherein the UE comprises a Narrowband Internet of Things (NB-IoT) device or a Machine Type communication (MTC) device.