Simultaneous reception of vehicle-to-everything (V2X) messages over multiple channels in multi-channel V2X networks

Patent metadata

Field	Value
Publication number	US-10491312-B1
Application number	US-201816122869-A
Country	US
Kind code	B1
Filing date	Sep 5, 2018
Priority date	Sep 5, 2018
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

The disclosure describes embodiments for reducing interference for wireless vehicular messages. In some embodiments, a method includes detecting a presence of an interference signal on a channel of a Vehicle-to-Everything (V2X) radio which obscures payload data that is included in a V2X message received via the channel. The method includes determining a source of the interference signal present on the channel. The method includes canceling out the interference signal from the V2X message using a cancellation sequence selected based on the source to generate a modified version of the V2X message including the payload data which is substantially unobscured by the interference signal. The method includes providing the modified version of the V2X message to a vehicle component so that the vehicle component provides its functionality based on the payload data and not the interference signal.

First claim

What is claimed is:

1. A method comprising:
detecting a presence of an interference signal on a channel of a Vehicle-to-Everything (V2X) radio which obscures payload data that is included in a V2X message received via the channel;
determining that a source of the interference signal present on the channel is both on-board the V2X radio and off-board the V2X radio and that a type of the interference signal is combination interference;
canceling out the interference signal from the V2X message to generate a modified version of the V2X message including the payload data which is substantially unobscured by the interference signal by:
applying a self-interference cancellation technique to cancel out any self-interference from the V2X message;
applying an adjacent-channel interference cancellation technique to cancel out any adjacent channel interference from the V2X message; and
determining an execution order to cancel out the self-interference and the adjacent channel interference from the V2X message based on one or more order determination factors; and

providing the modified version of the V2X message to a vehicle component so that the vehicle component provides its functionality based on the payload data and not the interference signal.

2. The method of claim 1 , wherein the combination interference includes a combination of self-interference and adjacent channel interference.

3. The method of claim 2 , wherein applying the self-interference cancellation technique includes:
reducing or cancelling a self-interference waveform caused by the V2X message.

4. The method of claim 2 , wherein applying the self-interference cancellation technique includes:
measuring a receiver signal on a receiver of a vehicle;
de-modulating a self signal on a transmission channel from the receiver signal, wherein the self signal causes the self-interference on the channel of the V2X message;
re-modulating and de-equalizing the self signal to obtain an estimate of the self-interference;
updating the receiver signal by removing the estimate of the self-interference from the receiver signal; and
de-modulating the updated receiver signal.

5. The method of claim 2 , wherein applying the adjacent channel interference includes:
selecting an adjacent channel for decoding based on channel selection rules.

6. The method of claim 2 , wherein applying the adjacent channel interference includes:
measuring a receiver signal on a receiver of a vehicle;
selecting an adjacent channel for decoding to reduce interference from the V2X message;
decoding the receiver signal;
identifying a protocol; and
re-modulating the decoded receiver signal using the protocol.

7. The method of claim 6 , wherein decoding the receiver signal includes using a first protocol, a second protocol, or an nth protocol and identifying the protocol includes identifying the first protocol, the second protocol, or the nth protocol based on decoding the receiver signal.

8. The method of claim 1 , wherein
when the execution order indicates to cancel out the self-interference prior to the adjacent channel interference, applying the self-interference cancellation technique to cancel out the self-interference from the V2X message to generate a first intermediate version of the V2X message, and applying the adjacent-channel interface cancellation technique to cancel out the adjacent channel interference from the first intermediate version of the V2X message to generate the modified version of the V2X message; and
when the execution order indicates to cancel out the adjacent channel interference prior to the self-interference, applying the adjacent-channel interface cancellation technique to cancel out the adjacent channel interference from the V2X message to generate a second intermediate version of the V2X message, and applying the self-interference cancellation technique to cancel out the self-interference from the second intermediate version of the V2X message to generate the modified version of the V2X message.

9. The method of claim 8 , wherein the one or more order determination factors include at least one of a strength of the self-interference, a strength of the adjacent channel interference, and a source of a maximal interference from the self-interference and the adjacent channel interference.

10. The method of claim 1 , further comprising:
analyzing interference cancellation performance associated with the V2X message;
providing feedback data based on an analysis result of the interference cancellation performance; and
updating the canceling out of the interference signal based on the feedback data.

11. A system comprising:
a processor communicatively coupled to a Vehicle-to-Everything (V2X) radio and a non-transitory memory, wherein the V2X radio is operable to receive a V2X message on a channel of the V2X radio and the non-transitory memory stores computer code that is operable, when executed by the processor, to cause the processor to:
detect a presence of an interference signal on the channel of the V2X radio which obscures payload data that is included in the V2X message received via the channel;
determine that a source of the interference signal present on the channel is both on-board the V2X radio and off-board the V2X radio and that a type of the interference signal is combination interference;
cancel out the interference signal from the V2X message to generate a modified version of the V2X message including the payload data which is substantially unobscured by the interference signal by:
applying a self-interference cancellation technique to cancel out any self-interference from the V2X message;
applying an adjacent-channel interference cancellation technique to cancel out any adjacent channel interference from the V2X message; and
determining an execution order to cancel out the self-interference and the adjacent channel interference from the V2X message based on one or more order determination factors; and

provide the modified version of the V2X message to a vehicle component so that the vehicle component provides its functionality based on the payload data and not the interference signal.

12. The system of claim 11 , wherein combination interference includes a combination of self-interference and adjacent channel interference.

13. The system of claim 12 , wherein applying the self-interference cancellation technique includes:
reducing or cancelling a self-interference waveform caused by the V2X message.

14. The system of claim 12 , wherein applying the self-interference cancellation technique includes:
measuring a receiver signal on a receiver of a vehicle;
de-modulating a self signal on a transmission channel from the receiver signal, wherein the self signal causes the self-interference on the channel of the V2X message;
re-modulating and de-equalizing the self signal to obtain an estimate of the self-interference;
updating the receiver signal by removing the estimate of the self-interference from the receiver signal; and
de-modulating the updated receiver signal.

15. The system of claim 12 , wherein applying the adjacent channel interference includes:
selecting an adjacent channel for decoding based on channel selection rules.

16. A computer program product embodied on a non-transitory computer readable medium comprising instructions that, when executed by a processor, causes the processor to perform operations comprising:
detecting a presence of an interference signal on a channel of a Vehicle-to-Everything (V2X) radio which obscures payload data that is included in a V2X message received

Assignees

• Toyota Motor Co Ltd

Inventors

• Shimizu Takayuki
• Doi Yoshiharu
• Altintas Onur
• Melen Roger
• Lu Hongsheng
• Bansal Gaurav
• Kenney John

Classifications

• H04W4/40

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

• H04B2001/1045

  Adjacent-channel interference · CPC title

• H04B1/525

  with means for reducing leakage of transmitter signal into the receiver · CPC title

• H04B1/3822

  specially adapted for use in vehicles (H04B1/3827 takes precedence) · CPC title

• H04B15/00 Primary

  Suppression or limitation of noise or interference (by means associated with receiver H04B1/10) · CPC title