Method of receiving signal based on signal quality in device to device (D2D) communication

Patent metadata

Field	Value
Publication number	US-10028223-B2
Application number	US-201514812728-A
Country	US
Kind code	B2
Filing date	Jul 29, 2015
Priority date	Jul 29, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

One disclosure of the present specification provides a method of receiving a signal based on signal quality in a device to device (D2D) communication. The method may include: receiving a signal from the other terminal; measuring signal quality for each of a plurality of physical resource block (PRB) regions included in a frequency region in which the signal can be received; choosing a candidate PRB region for which demodulation is performed among the plurality of PRB regions on the basis of the measured signal quality; and performing demodulation on the candidate PRB region.

First claim

What is claimed is:

1. A method of receiving a signal by a terminal for performing a device-to-device (D2D) communication, the method comprising:
measuring signal quality over a plurality of physical resource block (PRB) regions;
choosing a candidate PRB region for which demodulation is performed among the plurality of PRB regions based on the measured signal quality; and
performing demodulation only on a signal for the chosen candidate PRB region based on the measured signal quality,
wherein the signal is a discovery signal or a scheduling assignment (SA) signal received from another terminal, and
wherein measuring the signal quality comprises:
marking a PRB region as the candidate PRB region if the signal quality is greater than or equal to a threshold; and
determining that the discovery signal or the SA signal does not exist in the PRB region if the signal quality is less than the threshold.

2. The method of claim 1 , wherein the demodulation is performed only on the signal for the chosen candidate PRB region based on single carrier frequency division multiple access (SC-FDMA).

3. The method of claim 1 , further comprising performing fast Fourier transform (FFT) on the signal for the chosen candidate PRB region.

4. The method of claim 1 , wherein the signal quality over the plurality of PRB regions is measured based on a signal strength of the signal for each of the plurality of PRB regions, a least square (LS) channel estimation scheme, or a signal strength of an estimated channel.

5. A terminal for performing a device-to-device (D2D) communication, the terminal comprising:
a radio frequency (RF) unit configured to communicate with another terminal; and
a processor configured to:
measure signal quality over a plurality of physical resource block (PRB) regions,
choose a candidate PRB region for which demodulation is performed among the plurality of PRB regions based on the measured signal quality, and
perform demodulation only on a signal for the chosen candidate PRB region based on the measured signal quality,

wherein the signal is a discovery signal or a scheduling assignment (SA) signal received from the another terminal, and
wherein the processor is further configured to:
mark a PRB region as the candidate PRB region if the signal quality is greater than or equal to a threshold, and
determine that the discovery signal or the SA signal does not exist in the PRB region if the signal quality is less than the threshold.

6. The terminal of claim 5 , wherein the processor performs demodulation only on the signal for the chosen candidate PRB region based on single carrier frequency division multiple access (SC-FDMA).

7. The terminal of claim 5 , wherein the processor performs fast Fourier transform (FFT) on the signal for the chosen candidate PRB region.

8. The terminal of claim 5 , wherein the processor measures the signal quality over the plurality of PRB regions based on a signal strength of the signal for each of the plurality of PRB regions, a least square (LS) channel estimation scheme, or a signal strength of an estimated channel.

Assignees

• Lg Electronics Inc

Inventors

• Woo Kyungsoo
• Park Changhwan
• Yoon Sukhyon

Classifications

• H04W72/54

  based on quality criteria · CPC title

• H04W4/70

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

• H04L43/16

  Threshold monitoring · CPC title

• H04W52/0245 Primary

  according to signal strength · CPC title

• H04W92/18

  between terminal devices · CPC title