Techniques and apparatuses for autonomous resource selection for vehicle-to-everything (v2x) transmissions

Patent metadata

Field	Value
Publication number	US-2019104525-A1
Application number	US-201715850539-A
Country	US
Kind code	A1
Filing date	Dec 21, 2017
Priority date	Oct 2, 2017
Publication date	Apr 4, 2019
Grant date	—

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, 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 transmitting the V2X transmission based at least in part on the one or more parameters.

2 . The method of claim 1 , wherein the one or more parameters 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 the one or more parameters 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 the one or more parameters 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 the one or more parameters 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 the one or more parameters 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 the one or more parameters are determined based at least in part on a velocity of the UE.

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

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

10 . The method of claim 1 , wherein the one or more parameters are determined to maximize a range of the V2X transmission subject to the limit on the number of RBs.

11 . The method of claim 1 , wherein the one or more parameters 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 the one or more parameters are determined based at least in part on a default MCS associated with the UE or a default combination of parameters 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 an MCS, a number of TBs, a number of RBs per TB, and a retransmission configuration for the V2X transmission; and determining the one or more parameters based at least in part on comparing the plurality of resource block requirements to the limit on the number of RBs.

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 communication 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 one or more parameters 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 has changed.

17 . The method of claim 1 , wherein the one or more parameters include the retransmission configuration, wherein the retransmission configuration enables retransmission of the V2X transmission; and
wherein determining the one or more parameters comprises selecting a lowest MCS value that satisfies the limit on the number of RBs with retransmission enabled.

18 . The method of claim 1 , wherein the one or more parameters include the retransmission configuration, wherein the retransmission configuration disables retransmission of the V2X transmission; and
wherein determining the one or more parameters comprises selecting a lowest MCS value that satisfies the limit on the number of RBs with retransmission disabled.

19 . The method of claim 1 , wherein the one or more parameters include the retransmission configuration; and
wherein the method further comprises: determining a first set of parameters that includes a first MCS that satisfies the limit on the number of RBs with the retransmission configuration configured to enable retransmission of the V2X transmission; determining a second set of parameters that includes a second MCS that satisfies the limit on the number of RBs with the retransmission configuration configured to disable retransmission of the V2X transmission; estimating a first range for the V2X transmission using the first set of parameters; estimating a second range for the V2X transmission using the second set of parameters; and wherein determining the one or more parameters for the V2X transmission comprises selecting one of the first set of parameters or the second set of parameters based at least in part on comparing the first range and the second range.

20 . A user equipment (UE) for wireless communication, comprising:
memory; and one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
determine 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;
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
transmit the V2X transmission based at least in part on the one or more parameters.

21 . The UE of claim 20 , wherein the one or more parameters are determined based at least in part on one or more of:
a dynamic factor associated with the UE or a wireless network via which the V2X transmission is transmitted, a network traffic demand associated with one or more applications of the UE, the congestion level of the sidelink channel, a carrier f

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

• H04W4/40 Primary

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

• H04W72/51

  based on terminal or device properties · CPC title

• H04L1/0003

  by switching between different modulation schemes · CPC title

• H04W4/44

  for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H] · CPC title