Method for transmitting D2D discovery message performed by terminal in wireless communication system, and terminal using said method

• US 10,237,814 B2
• Filed: 11/06/2015
• Issued: 03/19/2019
• Est. Priority Date: 11/06/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jung, Sunghoon, Seo, Hanbyul
• Primary Examiner(s): Pezzlo, John
• Application Number:
  US15/524,433
• Publication Number:
  US 20180288685A1
• Time in Patent Office: 1,229 Days
• Field of Search: 370252, 370254, 370278, 370329, 370386
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

Provided are a method for transmitting a device-to device (D2D) discovery message performed by a terminal in a wireless communication system, and a terminal using said method. The method determines individual range classes for a plurality of D2D discovery resource pools; selects a D2D discovery resource pool having a higher ranger class when it is not possible to find a D2D resource pool having the same range class as the range class of the D2D discovery message from the plurality of D2D discovery resource pools; and transmits the D2D discovery message using the selected D2D discovery resource pool.

Claims

1. A method for transmitting a device-to-device (D2D) discovery message using a user equipment (UE) in a wireless communication system, the method comprising:

determining a range class for each of a plurality of D2D discovery resource pools;

selecting a D2D discovery resource pool having a range class longer than the range class of the D2D discovery message if determination that a D2D discovery resource pool having the same range class as a range class of a D2D discovery message is absent among the plurality of D2D discovery resource pools; and

transmitting the D2D discovery message using the selected D2D discovery resource pool.

2. The method of claim 1, further comprising receiving an index for each of the plurality of D2D discovery resource pools.

3. The method of claim 2, wherein the index indicates a range in which a corresponding D2D discovery resource pool is available.

4. The method of claim 3, further comprising setting a transmission power parameter for each of the plurality of D2D discovery resource pools.

5. The method of claim 2, wherein transmitting the D2D discovery message using the selected D2D discovery resource pool comprises:

selecting, by the UE, a second transmission power parameter other than a first transmission power parameter, wherein the first parameter is set for the selected D2D discovery resource pool by the network; and

transmitting the D2D discovery message based on the second transmission power parameter.

6. The method of claim 5, wherein the first parameter is determined based on a range class of the D2D discovery resource pool, wherein the second parameter is selected by the UE to limit a transmission power determined based on the first parameter.

7. The method according to claim 1, wherein the range classes for the plurality of D2D discovery resource pools include a long range, a medium range, and a short range.

8. The method according to claim 1, wherein the range class for the D2D discovery message includes one of a long range, a medium range, and a short range.

9. A user equipment (UE), the UE comprising:

a radio frequency (RF) unit configured to transmit and receive a radio signal; and

a processor coupled to the RF unit, wherein the processor is configured to;

determine a range class for each of a plurality of D2D discovery resource pools;

select a D2D discovery resource pool having a range class longer than the range class of the D2D discovery message if determination that a D2D discovery resource pool having the same range class as a range class of a D2D discovery message is absent among the plurality of D2D discovery resource pools; and

transmit the D2D discovery message using the selected D2D discovery resource pool.