AUTONOMOUS RESOURCE SELECTION FOR MULTIPLE TRANSMISSIONS IN DEVICE-TO-DEVICE COMMUNICATIONS

• US 20180063816A1
• Filed: 08/17/2017
• Published: 03/01/2018
• Est. Priority Date: 08/25/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gulati, Kapil, Baghel, Sudhir Kumar, Patil, Shailesh, Nguyen, Tien Viet, Wu, Zhibin
• Granted Patent: US 10,631,271 B2
• Time in Patent Office: Days
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

A user equipment (UE) may communicate with one or more other UEs using multiple transmissions in a device-to-device (D2D) communications deployment. A number of UEs may be configured with D2D resources, and a transmitting UE may identify available D2D resources from the configured resources. The transmitting UE may identify a resource for a first transmission of a D2D transmission from the available D2D resources, and may identify a second resource for a second transmission of the D2D transmission. The second transmission may be a blind HARQ transmission that may be transmitted to enhance the likelihood that one or more receiving UEs successfully receive the transmission. In some examples, the second resource may be identified based on other available resources within an predetermined time window around the first transmission.

Claims

1. A method for wireless communication, comprising:

identifying a candidate set of resources within a set of available resources for transmitting a device-to-device (D2D) transmission;

selecting a first resource within the candidate set of resources for transmitting a first transmission of the D2D transmission;

determining a subset of the set of available resources for transmitting a second transmission of the D2D transmission;

selecting a second resource within the subset of the set of available resources for transmitting the second transmission;

transmitting the first transmission using the first resource; and

transmitting the second transmission using the second resource.

2. The method of claim 1, wherein the determining the subset of the set of available resources comprises:

determining remaining resources of the candidate set of resources based at least in part on removing the first resource from the candidate set of resources.

3. The method of claim 2, wherein the determining the subset of the set of available resources further comprises:

identifying a first time for transmitting the first transmission;

identifying a time window around the first time; and

determining the subset of the set of available resources as remaining resources within the time window.

4. The method of claim 3, wherein the selecting the second resource comprises randomly selecting the second resource from the subset of the set of available resources.

5. The method of claim 3, wherein the time window is configured by a base station.

6. The method of claim 3, wherein the time window comprises a predetermined fixed time window.

7. The method of claim 3, further comprising:

determining that the subset of the set of available resources for transmitting the second transmission is empty; and

skipping the selecting the second resource and transmitting the second transmission.

8. The method of claim 3, further comprising:

determining that the subset of the set of available resources for transmitting the second transmission is empty; and

modifying the candidate set of resources to include additional resources of the set of available resources such that the subset of the set of available resources is non-empty.

9. The method of claim 8, wherein the candidate set of resources is identified as resources of the set of available resources having a received energy that is below a threshold value, and wherein the modifying comprises increasing the threshold value until the subset of the set of available resources is non-empty.

10. The method of claim 1, wherein the first resource is selected randomly from the candidate set of resources.

11. The method of claim 1, wherein the D2D transmission comprises a sidelink transmission between two D2D user equipment (UE) devices, and wherein the set of available resources are primary sidelink shared channel (PSSCH) resources.

12. The method of claim 1, wherein the set of available resources comprises a subset of a configured set resources available for D2D transmissions, and is identified based at least in part on one or more scheduling assignments (SAs) associated with one or more D2D transmitters.

13. An apparatus for wireless communication, comprising:

means for identifying a candidate set of resources within a set of available resources for transmitting a device-to-device (D2D) transmission;

means for selecting a first resource within the candidate set of resources for transmitting a first transmission of the D2D transmission;

means for determining a subset of the set of available resources for transmitting a second transmission of the D2D transmission;

means for selecting a second resource within the subset of the set of available resources for transmitting the second transmission;

means for transmitting the first transmission using the first resource; and

means for transmitting the second transmission using the second resource.

14. The apparatus of claim 13, further comprising:

means for determining remaining resources of the candidate set of resources based at least in part on removing the first resource from the candidate set of resources.

15. The apparatus of claim 14, further comprising:

means for identifying a first time for transmitting the first transmission;

means for identifying a time window around the first time; and

means for determining the subset of the set of available resources as remaining resources within the time window.

16. An apparatus for wireless communication, in a system comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to;

identify a candidate set of resources within a set of available resources for transmitting a device-to-device (D2D) transmission;

select a first resource within the candidate set of resources for transmitting a first transmission of the D2D transmission;

determine a subset of the set of available resources for transmitting a second transmission of the D2D transmission;

select a second resource within the subset of the set of available resources for transmitting the second transmission;

transmit the first transmission using the first resource; and

transmit the second transmission using the second resource.

17. The apparatus of claim 16, wherein the instructions are further executable to:

determine remaining resources of the candidate set of resources based at least in part on removing the first resource from the candidate set of resources.

18. The apparatus of claim 17, wherein the instructions are further executable to:

identify a first time for transmitting the first transmission;

identify a time window around the first time; and

determine the subset of the set of available resources as remaining resources within the time window.

19. The apparatus of claim 18, wherein the instructions are further executable to:

randomly select the second resource from the subset of the set of available resources.

20. The apparatus of claim 18, wherein the time window is configured by a base station.

21. The apparatus of claim 18, wherein the time window comprises a predetermined fixed time window.

22. The apparatus of claim 18, wherein the instructions are further executable by the processor to:

determine that the subset of the set of available resources for transmitting the second transmission is empty; and

skip the selecting the second resource and transmitting the second transmission.

23. The apparatus of claim 18, wherein the instructions are further executable by the processor to:

determine that the subset of the set of available resources for transmitting the second transmission is empty; and

modify the candidate set of resources to include additional resources of the set of available resources such that the subset of the set of available resources is non-empty.

24. The apparatus of claim 23, wherein the candidate set of resources is identified as resources of the set of available resources having a received energy that is below a threshold value, and wherein the instructions are further executable by the processor to:

increase the threshold value until the subset of the set of available resources is non-empty.

25. The apparatus of claim 16, wherein the first resource is selected randomly from the candidate set of resources.

26. The apparatus of claim 16, wherein the D2D transmission comprises a sidelink transmission between two D2D user equipment (UE) devices, and wherein the set of available resources are primary sidelink shared channel (PSSCH) resources.

27. The apparatus of claim 16, wherein the set of available resources comprises a subset of a configured set resources available for D2D transmissions, and is identified based at least in part on one or more scheduling assignments (SAs) associated with one or more D2D transmitters.

28. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:

identify a candidate set of resources within a set of available resources for transmitting a device-to-device (D2D) transmission;

select a first resource within the candidate set of resources for transmitting a first transmission of the D2D transmission;

determine a subset of the set of available resources for transmitting a second transmission of the D2D transmission;

select a second resource within the subset of the set of available resources for transmitting the second transmission;

transmit the first transmission using the first resource; and

transmit the second transmission using the second resource.

29. The non-transitory computer-readable medium of claim 28, wherein the instructions are further executable to:

determining remaining resources of the candidate set of resources based at least in part on removing the first resource from the candidate set of resources.

30. The non-transitory computer-readable medium of claim 29, wherein the instructions are further executable to:

identify a first time for transmitting the first transmission;

identify a time window around the first time; and

determine the subset of the set of available resources as remaining resources within the time window.