Signal transmission/reception method and apparatus of D2D terminal

• US 9,820,285 B2
• Filed: 08/06/2015
• Issued: 11/14/2017
• Est. Priority Date: 08/06/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Xue, Peng, Ryu, Hyunseok, Park, Seunghoon, Choi, Sangwon
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): Bokhari, Syed M
• Application Number:
  US14/820,429
• Publication Number:
  US 20160044652A1
• Time in Patent Office: 831 Days
• Field of Search: 370329, 370311, 370350, 370254
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: H04W 76/28 Discontinuous transmission [DTX]; Discontinuous reception [DRX]
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A terminal includes a transceiver configured to transmit or receive signals, and a controller configured to determine whether a current subframe is a subframe in which the terminal has to monitor a PDCCH, in response to the current subframe not being the subframe, determine whether a discovery pool for the terminal exists, and when the discovery pool for the terminal exists, operate a D2D discovery operation in the current subframe.

Claims

1. A method for operating a terminal in a wireless communication system, the method comprising:

receiving information on a discovery pool and information on at least one subframe to monitor a physical downlink control channel (PDCCH);

determining whether to monitor the PDCCH in a current subframe based on the information on the at least one subframe to monitor the PDCCH in a discontinuous reception (DRX) mode;

determining whether the current subframe is included in the discovery pool for a device to device (D2D) operation based on the information on the discovery pool, if the current subframe is not a subframe to monitor the PDCCH; and

performing switching to the D2D operation, if the current subframe is included in the discovery pool.

2. The method of claim 1, further comprising:

monitoring the PDCCH if the current subframe is the subframe to monitor the PDCCH.

3. The method of claim 1, wherein the information on the at least one subframe to monitor the PDCCH comprises paging occasion information and information on the DRX mode.

4. The method of claim 1, further comprising:

identifying a system frame number (SFN) of the current subframe and whether the DRX mode is applied in the current subframe.

5. The method of claim 1, further comprising:

determining whether a resource for transmitting a device-to-device (D2D) synchronization signal and the discovery pool are overlapped, and

determining whether a transmission of the D2D synchronization signal is triggered, if the resource for transmitting the D2D synchronization signal and the discovery pool are overlapped.

6. The method of claim 1, wherein the information on the discovery pool comprises offset information of a serving cell and neighbor cells and information on a period of the discovery pool.

7. The method of claim 5, further comprising:

transmitting, if the transmission of the D2D synchronization signal is triggered, the D2D synchronization signal.

8. The method of claim 7, further comprising:

transmitting D2D data to another terminal, if the transmission of the D2D synchronization signal is not triggered.

9. The method of claim 7, further comprising:

receiving at least one of D2D data and a D2D synchronization signal from another terminal, if the transmission of the D2D synchronization signal is not triggered.

10. A terminal in a wireless communication system, comprising:

a transceiver configured to transmit or receive signals to from at least one of a base station and another terminal; and

a controller configured to control to;

receive information on a discovery pool and information on at least one subframe to monitor a physical downlink control channel (PDCCH);

determine whether to monitor the PDCCH in a current subframe based on the information on the at least one subframe to monitor the PDCCH in a discontinuous reception (DRX) mode,

determine whether the current subframe is included in the discovery pool for a device to device (D2D) operation based on the information on the discovery pool, if the current subframe is not a subframe to monitor the PDCCH, and

perform switching to the D2D operation, if the current subframe is included in the discovery pool.

11. The terminal of claim 10, wherein the controller is further configured to control the transceiver to monitor the PDCCH if the current subframe is the subframe to monitor the PDCCH.

12. The terminal of claim 10, wherein the information on the at least one subframe to monitor the PDCCH comprises paging occasion information and information on the DRX mode.

13. The terminal of claim 10, wherein the controller is further configured to identify a system frame number (SFN) of the current subframe and whether the DRX mode is applied in the current subframe.

14. The terminal of claim 10, wherein the controller is further configured to determine whether a resource for transmitting a device-to-device (D2D) synchronization signal and the discovery pool are overlapped, and

determining whether a transmission of the D2D synchronization signal is triggered, if the resource for transmitting the D2D synchronization signal and the discovery pool are overlapped.

15. The terminal of claim 10, wherein the information on the discovery pool comprises offset information of a serving cell and neighbor cells and information on a period of the discovery pool.

16. The terminal of claim 14, wherein the controller is further configured to control the transceiver to transmit, if the transmission of the D2D synchronization signal is triggered, the D2D synchronization signal.

17. The terminal of claim 16, wherein the controller is further configured to control the transceiver to transmit D2D data to another terminal, if the transmission of the D2D synchronization signal is not triggered.

18. The terminal of claim 16, wherein the controller is further configured to control the transceiver to receive at least one of D2D data and a D2D synchronization signal from another terminal, if the transmission of the D2D synchronization signal is not triggered.