Autonomous resource selection for multiple transmissions in device-to-device communications

• US 10,631,271 B2
• Filed: 08/17/2017
• Issued: 04/21/2020
• 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
• Primary Examiner(s): Nawaz, Asad M
• Assistant Examiner(s): Ali, Syed
• Application Number:
  US15/680,014
• Publication Number:
  US 20180063816A1
• Time in Patent Office: 978 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, wherein the D2D transmission comprises a sidelink transmission between two D2D user equipment (UE) devices, and wherein the set of available resources comprises primary sidelink shared channel (PSSCH) resources;

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

selecting a subset of the set of available resources from the candidate set of resources for transmitting a second transmission of the D2D transmission, wherein the subset of the set of available resources comprises one or more resources occurring within a predetermined time window around a first time associated with the first resource for transmitting the first transmission;

determining the subset of the set of available resources is empty;

skipping selecting a second resource within the subset of the set of available resources for transmitting the second transmission based at least in part on determining that the subset of the set of available resources is empty;

transmitting the first transmission using the first resource; and

skipping transmitting the second transmission using the second resource based at least in part on determining that the subset of the set of available resources is empty.

2. The method of claim 1, wherein the selecting the subset of the set of available resources from the candidate set of 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 selecting the subset of the set of available resources further comprises:

identifying the first time associated with the first resource for transmitting the first transmission;

identifying the predetermined time window around the first time; and

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

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

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

7. The method of claim 3, further comprising:

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.

8. The method of claim 7, 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.

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

10. 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.

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

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

means for selecting a subset of the set of available resources from the candidate set of resources for transmitting a second transmission of the D2D transmission, wherein the subset of the set of available resources comprises one or more resources occurring within a predetermined time window around a first time associated with the first resource for transmitting the first transmission;

means for determining the subset of the set of available resources is empty;

means for skipping selecting a second resource within the subset of the set of available resources for transmitting the second transmission based at least in part on determining that the subset of the set of available resources is empty;

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

means for skipping transmitting the second transmission using the second resource based at least in part on determining that the subset of the set of available resources is empty.

12. The apparatus of claim 11, 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.

13. The apparatus of claim 12, further comprising:

means for identifying the first time associated with the first resource for transmitting the first transmission;

means for identifying the predetermined time window around the first time associated with the first resource; and

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

14. 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, wherein the D2D transmission comprises a sidelink transmission between two D2D user equipment (UE) devices, and wherein the set of available resources comprises primary sidelink shared channel (PSSCH) resources;

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

select a subset of the set of available resources from the candidate set of resources for transmitting a second transmission of the D2D transmission, wherein the subset of the set of available resources comprises one or more resources occurring within a predetermined time window around a first time associated with the first resource for transmitting the first transmission;

determine the subset of the set of available resources is empty;

skip selecting a second resource within the subset of the set of available resources for transmitting the second transmission based at least in part on determining that the subset of the set of available resources is empty;

transmit the first transmission using the first resource; and

skip transmitting the second transmission using the second resource based at least in part on determining that the subset of the set of available resources is empty.

15. The apparatus of claim 14, 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.

16. The apparatus of claim 15, wherein the instructions are further executable to:

identify the first time associated with the first resource for transmitting the first transmission;

identify the predetermined time window around the first time associated with the first resource; and

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

17. The apparatus of claim 16, wherein the predetermined time window is configured by a base station.

18. The apparatus of claim 16, wherein the predetermined time window comprises a fixed time window.

19. The apparatus of claim 16, wherein the instructions are further executable by the processor to:

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.

20. The apparatus of claim 19, 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.

21. The apparatus of claim 14, wherein the first resource is selected randomly from the candidate set of resources.

22. The apparatus of claim 14, 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.

23. 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, wherein the D2D transmission comprises a sidelink transmission between two D2D user equipment (UE) devices, and wherein the set of available resources comprises primary sidelink shared channel (PSSCH) resources;

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

select a subset of the set of available resources from the candidate set of resources for transmitting a second transmission of the D2D transmission, wherein the subset of the set of available resources comprises one or more resources occurring within a predetermined time window around a first time associated with the first resource for transmitting the first transmission;

determine the subset of the set of available resources is empty;

skip selecting a second resource within the subset of the set of available resources for transmitting the second transmission based at least in part on determining that the subset of the set of available resources is empty;

transmit the first transmission using the first resource; and

skip transmitting the second transmission using the second resource based at least in part on determining that the subset of the set of available resources is empty.

24. The non-transitory computer-readable medium of claim 23, 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.

25. The non-transitory computer-readable medium of claim 24, wherein the instructions are further executable to:

identify the first time associated with the first resource for transmitting the first transmission;

identify the predetermined time window around the first time associated with the first resource; and

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