Direct communication method between terminals in wireless communication system, and apparatus therefor

Patent metadata

Field	Value
Publication number	US-10764902-B2
Application number	US-201615758719-A
Country	US
Kind code	B2
Filing date	Sep 12, 2016
Priority date	Sep 15, 2015
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

A method for performing, by a first terminal, D2D communication in a wireless communication system, according to an embodiment of the present invention, the method comprising: receiving, from a second terminal, control information including information on future resources of the second terminal allocated to be used for transmission of the second terminal; and performing D2D transmission in consideration of the future resources of the second terminal, wherein the first terminal does not perform the D2D transmission in a resource in which a receipt power of the future resources of the second terminal is greater than a specific threshold.

First claim

What is claimed is:

1. A method for performing D2D (device-to-device) communication, by a first user equipment UE, in a wireless communication system, the method comprising:
selecting, from a predetermined resource pool, candidate resources for transmission of a D2D signal configured with a first priority;
obtaining, from a second UE, information on a reserved resource scheduled to be used for transmission of data by the second UE and information on a second priority related to the data,
determining whether to exclude the reserved resource from the candidate resources based on a specific threshold; and
performing transmission of the D2D signal based on the determination,
wherein the reserved resource is excluded from the candidate resources based on a detection of a reception strength greater than or equal to the specific threshold value in the reserved resource,
wherein the reception strength is a reception power of a demodulation reference signal (DM-RS) directly measured in the reserved resource of the second UE, and
wherein the specific threshold, which is a reference value for determining whether to exclude the reserved resource, is predetermined based on the first priority and the second priority.

2. The method of claim 1 , wherein the specific threshold is received by higher layer signaling of a base station.

3. The method of claim 1 , wherein the candidate resources include the reserved resource when the reception power of the reserved resource is less than the specific threshold.

4. The method of claim 1 , wherein the reserved resource is excluded from the candidate resources when the reserved resource has a reception power greater than the specific threshold value and when a number of the determined transmission resources is greater than a specific value.

5. The method of claim 1 , wherein the second priority is different from the first priority.

6. A first user equipment (UE) performing D2D (device-to-device) communication in a wireless communication system, the first UE comprising:
an RF (radio frequency) unit including a transceiver; and
a processor,
wherein the processor configured to:
select, from a predetermined resource pool, candidate resources for transmission of a D2D signal configured with a first priority,
control the RF unit to obtain, from a second UE, information on a reserved resource scheduled to be used for transmission of data by the second UE and information on a second priority related to the data,
determine whether to exclude the reserved resource from the candidate resources based on a specific threshold,
control the RF unit to perform transmission of the D2D signal based on the determination
wherein the reserved resource is excluded from the candidate resources based on a detection of a reception strength greater than or equal to the specific threshold value in the reserved resource,
wherein the reception strength is a reception power of a demodulation reference signal (DM-RS) directly measured in the reserved resource of the second UE, and
wherein the specific threshold, which is a reference value for determining whether to exclude the reserved resource, is predetermined based on the first priority and the second priority.

7. The first UE of claim 6 , wherein the specific threshold is received by higher layer signaling of a base station.

8. The first UE of claim 6 , wherein the candidate resources include the reserved resource when the reception power of the reserved resource is less than the specific threshold.

9. The first UE of claim 6 , wherein the reserved resource is excluded from the candidate resources when the reserved resource has a reception power greater than the specific threshold value and when a number of the determined transmission resources is greater than a specific value.

10. The first UE of claim 6 , wherein the second priority is different from the first priority.

Assignees

• Lg Electronics Inc

Inventors

• Seo Hanbyul

Classifications

• H04W72/569 Primary

  of the traffic information · CPC title

• H04W72/53 Primary

  based on regulatory allocation policies · CPC title

• H04W4/70

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

• H04W28/26

  Resource reservation · CPC title

• H04W74/0808

  using carrier sensing, e.g. carrier sense multiple access [CSMA] · CPC title