METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CONTROL INFORMATION FOR DEVICE TO DEVICE (D2D) COMMUNICATION IN A WIRELESS COMMUNICATIONS SYSTEM

• US 20150049694A1
• Filed: 02/28/2013
• Published: 02/19/2015
• Est. Priority Date: 03/06/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHO, Heejeong, CHUNG, Jaehoon, CHOI, Hyeyoung
• Granted Patent: US 9,883,496 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers

Abstract

According to an embodiment of the present invention, a method for a first terminal to receive control information from a second terminal for device to device communication includes the steps of: receiving downlink control information (DCI) format containing a link indicator; and obtaining selectively one of downlink allocation information and uplink permission information contained in the DCI format according to the link indicator, wherein the downlink allocation information indicates a resource region for receiving data from the second terminal, and the uplink permission information indicates a resource region for transmitting data to the second terminal.

Claims

1. A method for receiving control information for device-to-device (D2D) communication with a second user equipment (UE) by a first UE in a wireless communication system, the method comprising:

receiving a downlink control information (DCI) format comprising a link indicator; and

selectively acquiring any one of downlink allocation information and uplink grant information, included in the DCI format, according to the link indicator,

wherein the downlink allocation information indicates a resource region in which data is received from the second UE, and the uplink grant information indicates a resource region for transmitting data to the second UE.

2. The method according to claim 1, wherein the DCI format is scrambled with a parameter shared by the first UE and the second UE.

3. The method according to claim 2, wherein the parameter is a link identifier of the first UE and the second UE.

4. The method according to claim 1, wherein the DCI format is scrambled with a UE-specific parameter.

5. The method according to claim 1, wherein:

when the first UE acquires the uplink grant information, data is transmitted to the second UE in a k^th subframe from a subframe, in which the DCI format is received, according to the uplink grant information; and

when the first UE acquires the downlink grant information, data is received from the second UE in a q^th subframe from a subframe, in which the DCI format is received, according to the downlink grant information.

6. The method according to claim 1, wherein k and q depend on an index of a subframe in which the DCI format is received.

7. The method according to claim 1, wherein the DCI format is received from a coordination station.

8. A first user equipment (UE) apparatus for performing device-to-device (D2D) communication with a second UE in a wireless communication system, the UE apparatus comprising:

a reception module; and

a processor,

wherein;

the processor receives a downlink control information (DCI) format comprising a link indicator and selectively acquires any one of downlink allocation information and uplink grant information, included in the DCI format, according to the link indicator; and

the downlink allocation information indicates a resource region in which data is received from the second UE, and the uplink grant information indicates a resource region for transmitting data to the second UE.

9. The UE apparatus according to claim 8, wherein the DCI format is scrambled with a parameter shared by the first UE and the second UE.

10. The UE apparatus according to claim 9, wherein the parameter is a link identifier of the first UE and the second UE.

11. The UE apparatus according to claim 8, wherein the DCI format is scrambled with a UE-specific parameter.

12. The UE apparatus according to claim 8, wherein:

when the first UE acquires the uplink grant information, data is transmitted to the second UE in a k^th subframe from a subframe, in which the DCI format is received, according to the uplink grant information; and

when the first UE acquires the downlink grant information, data is received from the second UE in a q^th subframe from a subframe, in which the DCI format is received, according to the downlink grant information.

13. The UE apparatus according to claim 8, wherein k and q depend on an index of a subframe in which the DCI format is received.

14. The UE apparatus according to claim 8, wherein the DCI format is received from a coordination station.