Method of and apparatus for transmitting data based on channel state in device-to-device communication

Patent metadata

Field	Value
Publication number	US-12426108-B2
Application number	US-202318545598-A
Country	US
Kind code	B2
Filing date	Dec 19, 2023
Priority date	Feb 27, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A method of performing device-to-device (D2D) communication by a first device includes obtaining at least one measurement value corresponding to a relative velocity between the first device and a second device; adjusting at least one transmission parameter based on the at least one measurement value; providing the adjusted at least one transmission parameter to the second device; and transmitting data to the second device based on the adjusted at least one transmission parameter.

First claim

What is claimed is:

1. A first device configured to perform device-to-device (D2D) communication with a second device by:
transmitting a plurality of reference signals based on frequency hopping in a wideband to the second device;
receiving channel state information from the second device;
determining a plurality of transmission parameters based on the channel state information;
transmitting the plurality of transmission parameters to the second device; and
transmitting data based on the plurality of transmission parameters to the second device,
wherein the first device is further configured to:
obtain at least one measurement value corresponding to a relative velocity between the first device and the second device; and
adjust at least one transmission parameter among the plurality of transmission parameters,
wherein the channel state information is generated, by the second device, based on interpolation or extrapolation of an N number of reference signals recently received among the plurality of reference signals.

2. The first device of claim 1 , configured to obtain the at least one measurement value from the channel state information.

3. The first device of claim 2 , wherein the at least one measurement value comprises a value corresponding to a Doppler shift that is measured based on the plurality of reference signals in the second device.

4. The first device of claim 1 , configured to obtain the at least one measurement value by:
obtaining a velocity of the second device from the channel state information; and
generating the at least one measurement value based on a velocity of the first device and the velocity of the second device.

5. The first device of claim 1 , configured to:
adjust the at least one transmission parameter to correspond to a first data rate based on the at least one measurement value corresponding to a negative relative velocity between the first device and the second device; and
adjust the at least one transmission parameter to correspond to a second data rate based on the at least one measurement value corresponding to a positive relative velocity between the first device and the second device, and
wherein the first data rate is greater than the second data rate.

6. The first device of claim 5 , configured to:
adjust the at least one transmission parameter to correspond to the first data rate by increasing a modulation and coding scheme (MCS) index; and
adjust the at least one transmission parameter to correspond to the second data rate by decreasing the MCS index.

7. The first device of claim 1 , further configured to:
receive an acknowledgement corresponding to the transmitting of the data, from the second device; and
measure an error rate based on the acknowledgement,
wherein the first device is configured to adjust the at least one transmission parameter when the error rate is less than a first threshold value or is greater than a second threshold value.

8. A second device configured to perform device-to-device (D2D) communication with a first device by:
receiving a plurality of reference signals based on frequency hopping in a wideband from the first device;
generating channel state information based on interpolation or extrapolation of an N number of reference signals recently received among the plurality of reference signals;
transmitting the channel state information to the first device;
receiving a plurality of transmission parameters and data from the first device;
processing the data based on the plurality of transmission parameters,
wherein the plurality of transmission parameters includes at least one transmission parameter adjusted by the first device based on a relative velocity between the first device and the second device.

9. The second device of claim 8 , configured to generate the channel state information including at least one measurement value corresponding to the relative velocity.

10. The second device of claim 9 , configured to:
measure a Doppler shift based on the plurality of reference signals; and
generate the at least one measurement value based on the Doppler shift.

11. The second device of claim 9 , configured to:
measure a variation of received power based on the plurality of reference signals; and
generate the at least one measurement value based on the variation of received power.

12. The second device of claim 8 , wherein the plurality of reference signals comprises at least one of a synchronization signal, a tracking reference signal (TRS), a phase tracking reference signal (PT-RS), a demodulation reference signal (DMRS), and a channel state information reference signal (CSI-RS).

13. The second device of claim 8 , configured to generate the channel state information including a velocity of the second device.

14. A first device configured to perform device-to-device (D2D) communication with a second device, configured to:
obtain at least one measurement value corresponding to a relative velocity between the first device and the second device;
adjust at least one transmission parameter based on the at least one measurement value;
transmit a plurality of transmission parameters including the at least one transmission parameter to the second device; and
transmit data to the second device based on the plurality of transmission parameters,
wherein the first device is further configured to operate in a first mode or a second mode,
wherein, in the first mode, the first device is configured to:
receive a plurality of first reference signals from the second device;
estimate a channel state based on the plurality of first reference signals; and
determine the plurality of transmission parameters based on the channel state; and

wherein, in the second mode, the first device is configured to:
transmit at least one second reference signal to the second device;
receive channel state information from the second device corresponding to the at least one second reference signal; and
determine the plurality of transmission parameters based on the channel state information,
wherein the plurality of first reference signals are transmitted based on antenna switching between a transmitting antenna port and a receiving antenna port by the second device.

15. The first device of claim 14 , wherein, in the second mode, the first device is configured to obtain the at least one measurement value from the channel state information.

16. The first device of claim 15 , wherein the at least one measurement value comprises a value corresponding to a Doppler shift that is measured based on the at least one second reference signal in the second device.

17. The first device of claim 14 , configured to obtain the at least one measurement value by:
obtaining a velocity of the second device, measured in the second device, from the channel state information; and
generating the at least one measurement value based on a velocity of the first device and the velocity of the second device.

18. The first device of claim 14 , configured to:
adjust the at least one transmission parameter to correspond to a first data rate based on the at least one measurement value corresponding to a negative relative velocity between the first device and the second device; and
adjust the at least one transmission parameter to correspond to a second data rate based on the at least one measurement value corresponding to a positive relative velocity between the first device and the second device, and
wherein the first data rate is greater than the second data rate.

1

Assignees

• Samsung Electronics Co Ltd

Inventors

• Yum Kunil
• Kwon Yangsoo
• Park Jungmin
• Lee Junho

Classifications

• H04W64/006

  with additional information processing, e.g. for direction or speed determination · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W72/51

  based on terminal or device properties · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04L1/0003

  by switching between different modulation schemes · CPC title