METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL BY DEVICE-TO-DEVICE TERMINAL IN WIRELESS COMMUNICATION SYSTEM

• US 20170086176A1
• Filed: 05/18/2015
• Published: 03/23/2017
• Est. Priority Date: 05/16/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Inkwon
• Granted Patent: US 10,257,817 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04Q 2213/13215 Code checking, CRC
• CPC Class Codes: H04W 56/002 Mutual synchronization
• 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
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

One embodiment of the present invention is a method for a device-to-device (D2D) terminal to transmit and receive a signal in a wireless communication system, the method comprising: receiving downlink control information (DCI) comprising resource allocation information; checking the cyclic redundancy check (CRC) of the DCI by using a D2D radio network temporary identifier (RNTI); and, if there is no error in the result of the CRC check, performing D2D communication on resources denoted in the resource allocation information, wherein if the TPC field of the DCI is a pre-set value, a downlink signal is received from a base station on resources denoted in the resource allocation information.

Claims

1. A method for a D2D (Device to Device) user equipment to transceive a signal in a wireless communication system, the method comprising:

receiving DCI (Downlink control information) including resource allocation information;

making a CRC (Cyclic redundancy check) on the DCI using a D2D RNTI (Radio Network Temporary Identifier);

performing D2D communication on a resource indicated in the resource allocation information if a result of the CRC is errorless, wherein a downlink signal is received from a base station on the resource indicated in the resource allocation information if a TPC field value of the DC1 is a preset value.

2. The method of claim 1, wherein the CRC using the D2D RNTI is performed only if a subframe having the DCI received therein is included in a subframe set.

3. The method of claim 1, wherein if the CRC result is errorless and the TPC field value is the preset value, a D2D synchronization signal is regarded as not transmitted.

4. The method of claim 1, wherein if the CRC result is errorless and the TPC field value is the preset value, the resource indicated in the resource allocation information does not overlap with a resource indicated if the CRC result is errorless but the TPC field value is not the preset value.

5. The method of claim 1, wherein if the CRC result is errorless and the TPC field value is the preset value, the user equipment assumes that D2DSS (D2D synchronization signal), SA (scheduling assignment) and PD2DSCH (Physical D2D synchronization channel) are not transmitted.

6. The method of claim 1, wherein if the CRC result is errorless and the TPC field value is the preset value, the user equipment regards a large-scale feature as the same as a synchronization signal transmitted from the base station when receiving the downlink signal from the base station on the resource indicated in the resource allocation information.

7. The method of claim 1, wherein the resource indicated in the resource allocation information exists on an uplink frequency band.

8. In a D2D (Device to Device) user equipment device in a wireless communication system, a user equipment device comprising:

a receiver module; and

a processor,

wherein the processor is configured to receives DCI (Downlink control information) including resource allocation information, make a CRC (Cyclic redundancy check) on the DCI using a D2D RNTI (Radio Network Temporary Identifier), and if a result of the CRC is errorless, perform D2D communication on a resource indicated in the resource allocation information,

wherein if a TPC field value of the DCI is a preset value, a downlink signal is received from a base station on the resource indicated in the resource allocation information.

9. The user equipment device of claim 8, wherein the CRC using the D2D RNTI is performed only if a subframe having the DCI received therein is included in a subframe set.

10. The user equipment device of claim 8, wherein if the CRC result is errorless and the TPC field value is the preset value, a D2D synchronization signal is regarded as not transmitted.

11. The user equipment device of claim 8, wherein if the CRC result is errorless and the TPC field value is the preset value, the resource indicated in the resource allocation information does not overlap with a resource indicated if the CRC result is errorless but the TPC field value is not the preset value.

12. The user equipment device of claim 8, wherein if the CRC result is errorless and the TPC field value is the preset value, the user equipment assumes that D2DSS (D2D synchronization signal), SA (scheduling assignment) and PD2DSCH (Physical D2D synchronization channel) are not transmitted.

13. The user equipment device of claim 8, wherein if the CRC result is errorless and the TPC field value is the preset value, when receiving the downlink signal from the base station on the resource indicated in the resource allocation information, the user equipment regards a large-scale feature as the same as a synchronization signal transmitted from the base station.

14. The user equipment device of claim 8, wherein the resource indicated in the resource allocation information exists on an uplink frequency band.