Techniques and apparatuses for autonomous resource selection for vehicle-to-everything (V2X) transmissions

Patent metadata

Field	Value
Publication number	US-10791558-B2
Application number	US-201715850539-A
Country	US
Kind code	B2
Filing date	Dec 21, 2017
Priority date	Oct 2, 2017
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine a limit on a number of resource blocks (RBs) permitted to be used for a vehicle-to-everything (V2X) transmission by the UE; may determine, based at least in part on the limit, one or more parameters for the V2X transmission, wherein the one or more parameters include at least one of a modulation and coding scheme (MCS) for the V2X transmission, a number of transport blocks (TBs) for the V2X transmission, a number of RBs per TB for the V2X transmission, or a retransmission configuration for the V2X transmission; and may transmit the V2X transmission based at least in part on the one or more parameters. Numerous other aspects are provided.

First claim

What is claimed is:

1. A method of wireless communication performed by a user equipment (UE), comprising:
determining a limit on a number of resource blocks (RBs) permitted to be used for a vehicle-to-everything (V2X) transmission by the UE, wherein the limit is determined based at least in part on a congestion level of a sidelink channel via which the V2X transmission is to be transmitted;
determining, based at least in part on the limit, a combination of parameters for the V2X transmission, wherein the combination of parameters for the V2X transmission includes a modulation and coding scheme (MCS) for the V2X transmission and includes at least one of a number of transport blocks (TBs) for the V2X transmission, a number of RBs per TB for the V2X transmission, or a retransmission configuration for the V2X transmission,
wherein determining the combination of parameters for the V2X transmission comprises:
testing an initial combination of parameters for the V2X transmission to determine if the initial combination of parameters for the V2X transmission satisfies the limit on the number of RBs permitted to be used for the V2X transmission by the UE,
when the initial combination of parameters for the V2X transmission does not satisfy the limit on the number of RBs permitted to be used for the V2X transmission by the UE, testing a different combination of parameters for the V2X transmission,
the different combination of parameters for the V2X transmission having at least one of a different retransmission configuration than the initial combination, a smaller number of TBs than the initial combination, or a smaller number of RBs per TB than the initial combination, and

selecting the different combination of parameters for the V2X transmission as the combination of parameters for the V2X transmission when the different combination of parameters for the V2X transmission satisfies the limit on the number of RBs permitted to be used for the V2X transmission by the UE; and

transmitting the V2X transmission based at least in part on the combination of parameters for the V2X transmission.

2. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on one or more dynamic factors associated with the UE or a wireless network via which the V2X transmission is transmitted.

3. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a network traffic demand associated with one or more applications of the UE.

4. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a congestion level associated with a wireless network via which the V2X transmission is to be transmitted.

5. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a carrier frequency on which the V2X transmission is to be transmitted.

6. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a priority of the V2X transmission compared to a priority of at least one other V2X transmission.

7. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a velocity of the UE.

8. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a topography of a location of the UE.

9. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a location of the UE.

10. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined to maximize a range of the V2X transmission subject to the limit on the number of RBs permitted to be used for the V2X transmission by the UE.

11. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on at least one of:
a number of bits of the V2X transmission,
a deadline for transmission of the V2X transmission,
a semi-persistent scheduling period associated with the V2X transmission, or
some combination thereof.

12. The method of claim 1 , wherein one or more parameters, included in the combination of parameters for the V2X transmission, are determined based at least in part on a default MCS associated with the UE or a default combination of parameters for the V2X transmission associated with the UE.

13. The method of claim 1 , further comprising:
determining a plurality of resource block requirements corresponding to a plurality of combinations of parameters; and
determining the combination of parameters for the V2X transmission based at least in part on comparing the plurality of resource block requirements to the limit on the number of RBs permitted to be used for the V2X transmission by the UE.

14. The method of claim 13 , wherein a resource block requirement, of the plurality of resource block requirements, indicates a number of resource blocks required to transmit the V2X transmission using a particular combination of an MCS, a number of TBs, a number of RBs, and a retransmission configuration.

15. The method of claim 1 , wherein determining the combination of parameters for the V2X transmission comprises:
determining that a first MCS, selected by the UE, exceeds a peak MCS permitted to be used by the UE;
determining a second MCS based at least in part on determining that the first MCS exceeds the peak MCS;
determining that the second MCS does not exceed the peak MCS; and
wherein transmitting the V2X transmission comprises transmitting the V2X transmission using the second MCS based at least in part on determining that the second MCS does not exceed the peak MCS.

16. The method of claim 15 , wherein the second MCS is determined after waiting a threshold amount of time or determining that a condition associated with the limit on the number of RBs permitted to be used for the V2X transmission by the UE has changed.

17. The method of claim 1 , wherein the combination of parameters for the V2X transmission include the retransmission configuration, wherein the retransmission configuration enables retransmission of the V2X transmission; and
wherein determining the combination of parameters for the V2X transmission comprises selecting the lowest MCS value that satisfies the limit on the number of RBs permitted to be used for the V2X transmission by the UE with retransmission enabled.

18. The method of claim 1 , wherein the combination of parameters for the V2X transmission include the retransmission configuration, wherein the retransmission configuration disables retransmission of the V2X transmission; and
wherein determining the combination of parameters for the V2X transmission comprises selecting the lowest MCS value that satisfies the limit on the number of RBs permitted to be used for the V2X transmission by the UE with retransmission disabled.

19. The method of claim 1 , wherein the combination of parameters for the V2X transmiss

Assignees

• Qualcomm Inc

Inventors

• Santhanam Arvind
• Hoover Scott
• Mu Yunsong
• Wang Yuanbo
• Xiao Gang
• Liu Haiqin
• Rao Subramanya
• Tani Taoufik
• Lu Feng

Classifications

• H04W72/52 Primary

  based on load · CPC title

• H04W72/51

  based on terminal or device properties · CPC title

• H04W4/40 Primary

  for vehicles, e.g. vehicle-to-pedestrians [V2P] · CPC title

• H04W92/18

  between terminal devices · CPC title

• H04W4/02

  Services making use of location information · CPC title