METHOD AND APPARATUS FOR TRANSRECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20160157287A1
• Filed: 07/14/2014
• Published: 06/02/2016
• Est. Priority Date: 07/12/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chae, Hyukjin, Lee, Seungmin, Kim, Hakseong, Seo, Hanbyul
• Granted Patent: US 10,039,140 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

One embodiment of the present invention relates to a method for device-to-device transreceiving a signal by a first device in a wireless communication system, wherein the method for transreceiving a signal comprises the steps of: receiving from a second device a discovery signal; determining the number of antenna ports associated with the transmission of the discovery signal; and decoding the discovery signal based on the number of antenna ports, wherein an initial value of a sequence constituting the DMRS is determined by a parameter related to a cell ID, and the value of the parameter related to the cell ID is selected from a range of values differing from values available to a physical cell ID and a virtual cell ID.

Claims

1. A method for transmitting and receiving a device-to-device (D2D) signal by a first device in a wireless communication system, the method comprising:

receiving a discovery signal from a second device;

determining a number of antenna ports related to transmission of the discovery signal; and

decoding the discovery signal based on the number of antenna ports,

wherein an initial value of a sequence constituting a Demodulation Reference Signal (DMRS) is determined by a parameter related to a cell ID,

wherein a value of the parameter related to the cell ID is selected from a range which is different from a range of a physical cell ID and a range of virtual cell ID.

2. The method according to claim 1, wherein the number of antenna ports is indicated through one of a sequence shift pattern related to the initial value of the sequence constituting the DMRS associated with the discovery signal and a predetermined resource region associated with the discovery signal.

3. The method according to claim 2, wherein, when the number of antenna ports is indicated through the predetermined resource region associated with the discovery signal, a bit sequence mapped to the number of antenna ports is transmitted through the predetermined resource region.

4. The method according to claim 3, wherein the predetermined resource region is adjacent to a resource region for transmission of the DMRS associated with the discovery signal.

5. The method according to claim 3, wherein Single Input Single Output (SISO) is constantly used in transmitting the bit sequence.

6. The method according to claim 1, wherein the parameter related to the cell ID has the same value in one cluster.

7. The method according to claim 1, wherein, when the number of antenna ports is greater than or equal to 2, the sequence shift pattern is set to 0.

8. The method according to claim 1, wherein, when the number of antenna ports is greater than or equal to 2, an offset of a preset value is added to the sequence shift pattern.

9. The method according to claim 1, wherein, when the number of antenna ports is greater than or equal to 2, the first device assumes that the same precoding is used in a unit of a preset number of subframes in receiving the discovery signal.

10. The method according to claim 9, wherein the first device assumes that frequency hopping is not applied to transmission of the discovery signal.

11. The method according to claim 9, wherein, when frequency hopping is applied to transmission of the discovery signal, the first device assumes that the preset number is 1.

12. A first device for performing device-to-device (D2D) communication in a wireless communication system, the first device comprising:

a reception module; and

a processor,

wherein the processor is configured to receive a discovery signal from a second device, determine a number of antenna ports related to transmission of the discovery signal, and decode the discovery signal based on the number of antenna ports,

wherein the number of antenna ports is indicated through one of a sequence shift pattern related to an initial value of a sequence constituting a Demodulation Reference Signal (DMRS) associated with the discovery signal and a predetermined resource region associated with the discovery signal.