Repetition-based uplink for low latency communications in a new radio wireless communication system

1. A method of wireless communication, comprising:

receiving, by a user equipment (UE), a configuration message indicating a capability for repetition-based uplink communications with a network entity, the configuration message including one or more configuration parameters indicating at least a duration for transmissions on an uplink communication channel and an uplink shortened Transmission Time Interval (sTTI) pattern for the transmissions on the uplink communication channel, wherein the configuration message is included within either a Radio Resource Control (RRC) message or a Medium Access Control (MAC) Control Element (CE);

receiving, by the UE, an activation message for the repetition-based uplink communications from the network entity, the activation message including one or more transmission parameters indicating at least the duration for the transmissions on the uplink communication channel and the sTTI pattern for the transmissions on the uplink communication channel, wherein the repetition-based uplink communications correspond to multiple transmissions of a data packet on the uplink communication channel corresponding to the uplink sTTI pattern, and wherein the activation message is included within either a Medium Access Control (MAC) Control Element (CE) or a Downlink Control Information (DCI) message; and

performing, by the UE, repetitive transmissions on the uplink communication channel for the duration indicated by the one or more transmission parameters in the activation message, the repetitive transmissions being configured based on the uplink sTTI pattern.

2. The method of claim 1 , wherein the activation message is included within a grant message, and wherein the activation message includes an indication for a number of repetitive transmissions to perform.

3. The method of claim 2 , wherein the grant corresponds to a grant for a shortened Physical Uplink Shared Channel (sPUSCH).

4. The method of claim 1 , wherein performing the repetitive transmissions further comprises performing the repetitive transmissions on a plurality of uplink sTTIs located in two or more subframes.

5. The method of claim 4 , wherein performing the repetitive transmissions on the plurality of uplink sTTIs located in the two or more subframes further comprises maintaining a phase continuity parameter across one or more subframes for the duration indicated by the one or more transmission parameters in the activation message.

6. The method of claim 4 , wherein performing the repetitive transmissions on the plurality of uplink sTTIs located in the two or more subframes further comprises transmitting a Demodulation Reference Signal (DMRS) within each of one or more subframes for the duration indicated by the one or more transmission parameters in the activation message.

7. The method of claim 1 , wherein performing the repetitive transmissions further comprises transmitting a Sounding Reference Signal (SRS) over a last symbol of a subframe.

8. The method of claim 1 , wherein the uplink sTTI pattern for the transmissions on the uplink communication channel corresponds to a fixed uplink sTTI pattern configured for each starting sTTI and the duration for transmissions on the uplink communication channel.

9. An apparatus for wireless communications, comprising:

a memory; and

a processor in communication with the memory, wherein the processor is configured to:

receive, by a user equipment (UE), a configuration message indicating a capability for repetition-based uplink communications with a network entity, the configuration message including one or more configuration parameters indicating at least a duration for transmissions on an uplink communication channel and an uplink shortened Transmission Time Interval (sTTI) pattern for the transmissions on the uplink communication channel, wherein the configuration message is included within either a Radio Resource Control (RRC) message or a Medium Access Control (MAC) Control Element (CE);

receive an activation message for the repetition-based uplink communications from the network entity, the activation message including one or more transmission parameters indicating at least the duration for the transmissions on the uplink communication channel and the sTTI pattern for the transmissions on the uplink communication channel, wherein the repetition-based uplink communications correspond to multiple transmissions of a data packet on the uplink communication channel corresponding to the uplink sTTI pattern, and wherein the activation message is included within either a Medium Access Control (MAC) Control Element (CE) or a Downlink Control Information (DCI) message; and

perform, by the UE, repetitive transmissions on the uplink communication channel for the duration indicated by the one or more transmission parameters in the activation message, the repetitive transmissions being configured based on the uplink sTTI pattern.

10. The apparatus of claim 9 , wherein the activation message is included within a grant message, and wherein the activation message includes an indication for a number of repetitive transmissions to perform.

11. The apparatus of claim 10 , wherein the grant corresponds to a grant for a shortened Physical Uplink Shared Channel (sPUSCH).

12. The apparatus of claim 9 , wherein the processor configured to perform the repetitive transmissions is further configured to perform the repetitive transmissions on a plurality of uplink sTTIs located in two or more subframes.

13. The apparatus of claim 12 , wherein the processor configured to perform the repetitive transmissions on the plurality of uplink sTTIs located in the two or more subframes is further configured to maintain a phase continuity parameter across one or more subframes for the duration indicated by the one or more transmission parameters in the activation message.

14. The apparatus of claim 12 , wherein the processor configured to perform the repetitive transmissions on the plurality of uplink sTTIs located in the two or more subframes is further configured to transmit a Demodulation Reference Signal (DMRS) within each of one or more subframes for the duration indicated by the one or more transmission parameters in the activation message.

15. The apparatus of claim 9 , wherein the processor configured to perform the repetitive transmissions is further configured to transmit a Sounding Reference Signal (SRS) over a last symbol of a subframe.

16. The apparatus of claim 9 , wherein the uplink sTTI pattern for the transmissions on the uplink communication channel corresponds to a fixed uplink sTTI pattern configured for each starting sTTI and the duration for transmissions on the uplink communication channel.

17. An apparatus for wireless communications, comprising:

means for receiving, by a user equipment (UE), a configuration message indicating a capability for repetition-based uplink communications with a network entity, the configuration message including one or more configuration parameters indicating at least a duration for transmissions on an uplink communication channel and an uplink shortened Transmission Time Interval (sTTI) pattern for the transmissions on the uplink communication channel, wherein the configuration message is included within either a Radio Resource Control (RRC) message or a Medium Access Control (MAC) Control Element (CE);

means for receiving, by the UE, an activation message for repetition-based uplink communications from the network entity, the activation message including one or more transmission parameters indicating at least the duration for the transmissions on the uplink communication channel and the sTTI pattern for the transmissions on the uplink communication channel, wherein the repetition-based uplink communications correspond to multiple transmissions of a data packet on the uplink communication channel corresponding to the uplink sTTI pattern, and wherein the activation message is included within either a Medium Access Control (MAC) Control Element (CE) or a Downlink Control Information (DCI) message; and

means for performing, by the UE, repetitive transmissions on the uplink communication channel for the duration indicated by the one or more transmission parameters in the activation message, the repetitive transmissions being configured based on the uplink sTTI pattern.

18. A non-transitory computer-readable medium storing computer code executable by a processor for wireless communications, comprising:

code for receiving, by a user equipment (UE), a configuration message indicating a capability for repetition-based uplink communications with a network entity, the configuration message including one or more configuration parameters indicating at least a duration for transmissions on an uplink communication channel and an uplink shortened Transmission Time Interval (sTTI) pattern for the transmissions on the uplink communication channel, wherein the configuration message is included within either a Radio Resource Control (RRC) message or a Medium Access Control (MAC) Control Element (CE);

code for receiving, by the UE, an activation message for repetition-based uplink communications from the network entity, the activation message including one or more transmission parameters indicating at least the duration for transmissions on an uplink communication channel and the sTTI pattern for the transmissions on the uplink communication channel, wherein the repetition-based uplink communications correspond to multiple transmissions of a data packet on the uplink communication channel corresponding to the uplink sTTI pattern, and wherein the activation message is included within either a Medium Access Control (MAC) Control Element (CE) or a Downlink Control Information (DCI) message; and

code for performing, by the UE, repetitive transmissions on the uplink communication channel for the duration indicated by the one or more transmission parameters in the activation message, the repetitive transmissions being configured based on the uplink sTTI pattern.