Methods for efficient signaling in V2X communications

Patent metadata

Field	Value
Publication number	US-11522664-B2
Application number	US-202017067109-A
Country	US
Kind code	B2
Filing date	Oct 9, 2020
Priority date	Aug 24, 2016
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A transmitting UE schedules radio frequency resources for use in a data transmission. The transmitting UE determines the transmission bandwidth, subject to certain restrictions, such as allowed DFT sizes for the UE for a data transmission. The determination may be performed through autonomous resource selection operations and/or may be performed using information received through signaling received from the network node as part of a scheduling grant. The UE further determines the ALLOCATED BANDWIDTH. The ALLOCATED BANDWIDTH can be determined based on the TRANSMISSION BANDWIDTH, which has been determined, using a defined rule. Furthermore, the UE generates and transmits toward a receiving UE a scheduling assignment (SA) that indicates the number or the set of subchannels that are within, and conform to, the ALLOCATED BANDWIDTH which was determined. The UE can then perform the data transmission using the SA indicated number or set of subchannels.

First claim

The invention claimed is:

1. A method by a transmitting user equipment (UE) for controlling radio resources used for a data transmission, the method comprising:
determining an allocated bandwidth;
determining a transmission bandwidth for the data transmission based on a supported Discrete Fourier Transform size; and
transmitting, towards a receiving UE, a scheduling assignment that is based on the transmission bandwidth and indicates a number of subchannels within the allocated bandwidth or a set of subchannels within the allocated bandwidth,
wherein determining the allocated bandwidth is performed before determining the transmission bandwidth.

2. The method of claim 1 , wherein the supported Discrete Fourier Transform sizes are products of powers of 2, 3, 5.

3. The method of claim 1 , wherein:
determining the allocated bandwidth comprises a network node signalling the allocated bandwidth to the transmitting UE.

4. The method of claim 1 , wherein:
determining the transmission bandwidth comprises determining the transmission bandwidth as a largest number of resource blocks for a Discrete Fourier Transform size allowed for the UE such that the allocated bandwidth is greater than or equal to the transmission bandwidth.

5. A transmitting user equipment (UE) for controlling radio resources used for a data transmission, the UE is configured to perform:
determining an allocated bandwidth;
determining a transmission bandwidth for the data transmission based on a supported Discrete Fourier Transform size; and
transmitting towards a receiving UE a scheduling assignment that is based on the transmission bandwidth and indicates a number of subchannels within the allocated bandwidth or a set of subchannels within the allocated bandwidth,
wherein determining the allocated bandwidth is performed before determining the transmission bandwidth.

6. The transmitting UE of claim 5 , wherein the supported Discrete Fourier Transform sizes are products of powers of 2, 3, 5.

7. The transmitting UE of claim 5 , wherein in determining the allocated bandwidth, the transmitting UE is configured to perform determining the allocated bandwidth from a network node signalling the allocated bandwidth to the transmitting UE.

8. The transmitting UE of claim 5 , wherein in determining the transmission bandwidth, the transmitting UE is configured to perform determining the transmission bandwidth as a largest number of resource blocks for a Discrete Fourier Transform size allowed for the transmitting UE such that the allocated bandwidth is greater than or equal to the transmission bandwidth.

9. A method by a receiving user equipment (UE) for receiving a data transmission using radio resources, the method comprising:
determining an allocated bandwidth for the data transmission based on control signaling that is received by the receiving UE;
determining a transmission bandwidth associated with the allocated bandwidth based on a rule that is used by a transmitting UE and based on a supported Discrete Fourier Transform size; and
decoding a signal from the data transmission based on the transmission bandwidth,
wherein determining the allocated bandwidth is performed before determining the transmission bandwidth.

10. The method of claim 6 , wherein determining the allocated bandwidth for the data transmission comprises determining the allocated bandwidth based on a decoding content of a scheduling assignment that is received from a transmitting UE and which indicates a number of subchannels within the allocated bandwidth or a set of subchannels within the allocated bandwidth.

11. The method of claim 6 , wherein determining the allocated bandwidth comprises determining the allocated bandwidth before determining the transmission bandwidth.

12. The method of claim 6 , wherein determining the transmission bandwidth comprises determining a largest number of resource blocks for a supported Discrete Fourier Transform size such that the allocated bandwidth is greater than or equal to the transmission bandwidth.

13. The method of claim 12 , wherein the supported Discrete Fourier Transform sizes are products of powers of 2, 3, 5.

14. The method of claim 6 , wherein the decoding uses the transmission bandwidth to constrain what radio frequency resources are searched for the signal that is to be decoded.

15. A receiving user equipment (UE) for receiving a data transmission using radio resources, the receiving UE configured to perform:
determining an allocated bandwidth for the data transmission based on control signaling that is received by the receiving UE;
determining a transmission bandwidth associated with the allocated bandwidth based on a rule that is used by a transmitting UE and based on a supported Discrete Fourier Transform size; and
decoding a signal from the data transmission based on the transmission bandwidth,
wherein determining the allocated bandwidth is performed before determining the transmission bandwidth.

16. The receiving UE of claim 15 , wherein in determining the allocated bandwidth for the data transmission, the receiving UE is configured to perform determining the allocated bandwidth based on a decoding content of a scheduling assignment that is received from a transmitting UE and which indicates a number of subchannels within the allocated bandwidth or a set of subchannels within the allocated bandwidth.

17. The receiving UE of claim 15 , wherein in determining the allocated bandwidth, the receiving UE is further configured to perform determining the allocated bandwidth before determining the transmission bandwidth.

18. The receiving UE of claim 15 , wherein determining the transmission bandwidth comprises determining a largest number of resource blocks for a supported Discrete Fourier Transform size such that the allocated bandwidth is greater than or equal to the transmission bandwidth.

19. The receiving UE of claim 18 , wherein the supported Discrete Fourier Transform sizes are products of powers of 2, 3, 5.

20. The receiving UE of claim 15 , wherein the decoding uses the transmission bandwidth to constrain what radio frequency resources are searched for the signal that is to be decoded.

21. A computer program comprising a non-transitory computer readable medium having instructions to be executed by at least one processor of a user equipment (UE) for controlling radio resources used for a data transmission, whereby execution of the program code causes the UE to perform a method according to claim 1 .

22. A computer program comprising a non-transitory computer readable medium having instructions to be executed by at least one processor of a user equipment (UE) for receiving a data transmission using radio resources, whereby execution of the program code causes the UE to perform a method according to claim 9 .

23. The transmitting UE of claim 5 , wherein the transmitting UE comprises a vehicle.

24. The receiving UE of claim 15 , wherein the receiving UE comprises a vehicle.

Assignees

• Ericsson Telefon Ab L M

Inventors

• Sorrentino Stefano
• Blasco Serrano Ricardo
• Do Hieu

Classifications

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04L5/0037

  Inter-user or inter-terminal allocation · CPC title

• H04L5/0044

  Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH · CPC title

• H04W4/70

  Services for machine-to-machine communication [M2M] or machine type communication [MTC] · CPC title