PDSCH PROCESSING IN PRESENCE OF DOWNLINK PREEMPTION INDICATION

• US 20190320454A1
• Filed: 03/19/2019
• Published: 10/17/2019
• Est. Priority Date: 04/12/2018
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: LI, Chih Ping, CHEN, Wanshi
• Granted Patent: US 11,076,418 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/1273 of downlink data flows

Abstract

Certain aspects of the present disclosure provide techniques for physical downlink shared channel (PDSCH) processing in presence of downlink preemption indication (DLPI). A method for wireless communication by a base station (BS) includes determining a feedback timing indicator associated with a PDSCH transmission to a user equipment (UE) in a first slot. The determination is based on a first number of slots from the first slot until transmission of a DLPI to the UE in a second slot and a second number slots for a minimum processing time associated with the UE. The method includes sending downlink control information (DCI) to the UE scheduling the PDSCH transmission to the UE in the first slot. The DCI includes the feedback timing indicator. The UE determines how to process the PDSCH based on the feedback timing indicator.

Claims

1. A method for wireless communications by a user equipment (UE), comprising:

receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH) transmission in a first slot, the DCI including a feedback timing indicator associated with the PDSCH transmission;

receiving the PDSCH transmission in the first slot;

determining how to process the PDSCH transmission based on the feedback timing indicator; and

processing the PDSCH transmission based on the determination.

2. The method of claim 1, wherein the determination is based on a first number of slots from the first slot until a second slot in which a downlink preemption indication (DLPI) is transmitted and a second number of slots for a minimum processing time associated with the UE.

3. The method of claim 2, wherein determining how to process the PDSCH transmission comprises processing the PDSCH transmission, after receiving the PDSCH transmission in the first slot, without accounting for the DLPI when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

4. The method of claim 2, wherein determining how to process the PDSCH transmission comprises declaring an error case when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

5. The method of claim 2, wherein determining how to process the PDSCH transmission comprises processing the PDSCH transmission with accounting for the DLPI when the feedback timing indicator is equal to larger than a sum of the first number of slots and the second number of slots.

6. The method of claim 2, wherein the minimum processing time associated with the UE comprises a number of slots for the UE to decode the PDSCH transmission and prepare hybrid automatic repeat request (HARD) feedback for the PDSCH transmission.

7. The method of claim 2, further comprising determining the second slot in which the DLPI is transmitted based on a periodicity associated with the DLPI.

8. The method of claim 2, wherein the DLPI indicates PDSCH resources in at least one of:

the first slot or the first number of slots that are preempted by another PDSCH transmission.

9. The method of claim 8, wherein:

the PDSCH transmission comprises an enhanced mobile broadband (eMBB) PDSCH transmission; and

the another PDSCH transmission comprises an ultra-reliable low-latency communication (URLLC) PDSCH transmission.

10. The method of claim 1, wherein the feedback timing indicator indicates a number of slots after the scheduled PDSCH transmission for the UE to send hybrid automatic repeat request (HARD) feedback for the scheduled PDSCH transmission.

11. An apparatus for wireless communications, comprising:

at least one processor configured to;

receive downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH) transmission in a first slot, the DCI including a feedback timing indicator associated with the PDSCH transmission;

receive the PDSCH transmission in the first slot;

determine how to process the PDSCH transmission based on the feedback timing indicator; and

process the PDSCH transmission based on the determination; and

a memory coupled with the at least one processor.

12. The apparatus of claim 11, wherein the at least one processor is configured to determine how to process the PDSCH transmission based on a first number of slots from the first slot until a second slot in which a downlink preemption indication (DLPI) is transmitted and a second number of slots for a minimum processing time associated with the apparatus.

13. The apparatus of claim 12, wherein the at least one processor is configured to determine how to process the PDSCH transmission by processing the PDSCH transmission, after receiving the PDSCH transmission in the first slot, without accounting for the DLPI when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

14. The apparatus of claim 12, wherein the at least one processor is configured to determine how to process the PDSCH transmission by declaring an error case when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

15. The apparatus of claim 12, wherein the at least one processor is configured to determine how to process the PDSCH transmission comprises processing the PDSCH transmission with accounting for the DLPI when the feedback timing indicator is equal to larger than a sum of the first number of slots and the second number of slots.

16. The apparatus of claim 12, wherein the minimum processing time associated with the apparatus comprises a number of slots for the apparatus to decode the PDSCH transmission and prepare hybrid automatic repeat request (HARD) feedback for the PDSCH transmission.

17. The apparatus of claim 12, wherein the at least one processor is configured to determine the second slot in which the DLPI is transmitted based on a periodicity associated with the DLPI.

18. The apparatus of claim 12, wherein the DLPI indicates PDSCH resources in at least one of:

the first slot or the first number of slots that are preempted by another PDSCH transmission.

19. The apparatus of claim 18, wherein:

the PDSCH transmission comprises an enhanced mobile broadband (eMBB) PDSCH transmission; and

the another PDSCH transmission comprises an ultra-reliable low-latency communication (URLLC) PDSCH transmission.

20. The apparatus of claim 11, wherein the feedback timing indicator indicates a number of slots after the scheduled PDSCH transmission for the apparatus to send hybrid automatic repeat request (HARD) feedback for the scheduled PDSCH transmission.

21. An apparatus for wireless communications, comprising:

means for receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH) transmission in a first slot, the DCI including a feedback timing indicator associated with the PDSCH transmission;

means for receiving the PDSCH transmission in the first slot;

means for determining how to process the PDSCH transmission based on the feedback timing indicator; and

means for processing the PDSCH transmission based on the determination.

22. The apparatus of claim 21, wherein the determination is based on a first number of slots from the first slot until a second slot in which a downlink preemption indication (DLPI) is transmitted and a second number of slots for a minimum processing time associated with the apparatus.

23. The apparatus of claim 22, wherein determining how to process the PDSCH transmission comprises processing the PDSCH transmission, after receiving the PDSCH transmission in the first slot, without accounting for the DLPI when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

24. The apparatus of claim 22, wherein determining how to process the PDSCH transmission comprises declaring an error case when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

25. The apparatus of claim 22, wherein determining how to process the PDSCH transmission comprises processing the PDSCH transmission with accounting for the DLPI when the feedback timing indicator is equal to larger than a sum of the first number of slots and the second number of slots.

26. A computer readable medium having computer executable code stored thereon for wireless communications, comprising:

code for receiving downlink control information (DCI) scheduling a physical downlink shared channel (PDSCH) transmission in a first slot, the DCI including a feedback timing indicator associated with the PDSCH transmission;

code for receiving the PDSCH transmission in the first slot;

code for determining how to process the PDSCH transmission based on the feedback timing indicator; and

code for processing the PDSCH transmission based on the determination.

27. The computer readable medium of claim 26, wherein the determination is based on a first number of slots from the first slot until a second slot in which a downlink preemption indication (DLPI) is transmitted and a second number of slots for a minimum processing time associated with the apparatus.

28. The computer readable medium of claim 27, wherein determining how to process the PDSCH transmission comprises processing the PDSCH transmission, after receiving the PDSCH transmission in the first slot, without accounting for the DLPI when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

29. The computer readable medium of claim 27, wherein determining how to process the PDSCH transmission comprises declaring an error case when the feedback timing indicator is smaller than a sum of the first number of slots and the second number of slots.

30. The computer readable medium of claim 27, wherein determining how to process the PDSCH transmission comprises processing the PDSCH transmission with accounting for the DLPI when the feedback timing indicator is equal to larger than a sum of the first number of slots and the second number of slots.