SIGNAL TRANSMISSION/RECEPTION METHOD AND APPARATUS THEREFOR

• US 20150173048A1
• Filed: 04/04/2013
• Published: 06/18/2015
• Est. Priority Date: 06/20/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Daewon, Seo, Hanbyul
• Granted Patent: US 9,516,638 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 72/566 of the information or information source or recipient

Abstract

The present invention relates to a radio communication system which supports device-to-device (D2D) communication. More particularly, the present invention relates to a method for transmitting a D2D semi-persistent scheduled (SPS) signal in a radio communication system which supports D2D communication, and an apparatus therefor, the method comprising the steps of: receiving priority information of a D2D SPS signal from a base station; determining whether to send the D2D SPS signal or a signal intended for the base station, on the basis of the priority information, in a case where there is a clash, in a particular sub-frame, between the transmission of the D2D SPS signal and the signal intended for the base station; and transmitting the D2D SPS signal to a second terminal if the priority information of the D2D SPS signal has a higher priority than the signal intended for the base station.

Claims

1. A method of transmitting a device-to-device (D2D) semi-persistent scheduled (SPS) signal by a first user equipment in a wireless communication system supporting a D2D communication, comprising:

receiving priority information of the D2D SPS signal from a base station;

when a transmission of the D2D SPS signal and a transmission of a signal to the base station are collided with each other in a specific subframe, determining whether the D2D SPS signal is transmitted or the signal to the base station is transmitted based on the priority information; and

when the priority information of the D2D SPS signal indicates a priority higher than a priority of the signal to the base station, transmitting the D2D SPS signal to a second user equipment.

2. The method of claim 1, wherein the priority information of the D2D signal is received via a first field indicating a modulation and coding scheme among uplink grant downlink control information (DCI) for transmission of the D2D SPS signal.

3. The method of claim 2, wherein at least one bit of the first field indicates the priority information, and remaining bits of the first field are associated with the modulation and coding scheme.

4. The method of claim 2, wherein the uplink grant DCI information further comprises transmit power control information, and an initial transmit power of the D2D SPS signal is adjusted as much as a value indicated by the transmit power control information.

5. The method of claim 1, wherein the D2D SPS signal is transmitted using an initial transmit power predetermined according to the priority information.

6. The method of claim 1, wherein the D2D SPS signal is transmitted using a modulation and coding scheme predetermined according to the priority information.

7. The method of claim 1, wherein the priority information of the D2D signal is received via a field indicating acknowledgement (ACK)/negative acknowledgement (NACK) of a control channel that carries downlink ACK/NACK information.

8. The method of claim 1, wherein the D2D SPS signal is transmitted in accordance with an uplink hybrid automatic retransmission request (HARQ) retransmission period.

9. A user equipment transmitting a device-to-device (D2D) semi-persistent scheduled (SPS) signal in a wireless communication system supporting a D2D communication, comprising:

a radio frequency (RF) module; and

a processor, the processor configured to;

receive priority information of the D2D SPS signal from a base station via the RF module,

when a transmission of the D2D SPS signal and a transmission of a signal to the base station are collided with each other in a specific subframe, determine whether the D2D SPS signal is transmitted or the signal to the base station is transmitted based on the priority information,

when the priority information of the D2D SPS signal indicates a priority higher than a priority of the signal to the base station, transmit the D2D SPS signal to a second user equipment via the RF module.

10. The user equipment of claim 9, wherein the priority information of the D2D signal is received via a first field indicating a modulation and coding scheme among uplink grant downlink control information (DCI) for transmission of the D2D SPS signal.

11. The user equipment of claim 10, wherein at least one bit of the first field indicates the priority information, and remaining bits of the first field are associated with the modulation and coding scheme.

12. The user equipment of claim 10, wherein the uplink grant DCI information further comprises transmit power control information, and an initial transmit power of the D2D SPS signal is adjusted as much as a value indicated by the transmit power control information.

13. The user equipment of claim 9, wherein the D2D SPS signal is transmitted using an initial transmit power predetermined according to the priority information.

14. The user equipment of claim 9, wherein the D2D SPS signal is transmitted using a modulation and coding scheme predetermined according to the priority information.

15. The user equipment of claim 9, wherein the priority information of the D2D signal is received via a field indicating acknowledgement (ACK)/negative acknowledgement (NACK) of a control channel that carries downlink ACK/NACK information.

16. The user equipment of claim 9, wherein the D2D SPS signal is transmitted in accordance with an uplink hybrid automatic retransmission request (HARQ) retransmission period.