Method for performing discovery step and device therefor

• US 9,918,350 B2
• Filed: 08/04/2014
• Issued: 03/13/2018
• Est. Priority Date: 08/02/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hakseong, Kim, Byounghoon
• Primary Examiner(s): Kassim, Khaled
• Assistant Examiner(s): Yang, Zhaohui
• Application Number:
  US14/909,653
• Publication Number:
  US 20160192423A1
• Time in Patent Office: 1,317 Days
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 4/08 User group management
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

The present invention relates to a wireless communication system. Particularly, the present invention relates to a method and device by which a terminal performs a discovery step for D2D communication in a wireless communication system, the method comprising the steps of: receiving a first discovery signal (DS) including identification information of a target terminal from a member terminal of a first terminal group; checking whether the target terminal belongs to the first terminal group; and transmitting a second DS corresponding to the first DS, wherein if the target terminal belongs to the first terminal group, the second DS is transmitted to member terminals within the first terminal group, and if the target terminal does not belong to the first terminal group, the second DS is transmitted to a specific terminal within a second group different from the first group.

Claims

1. A method of performing a discovery procedure for Device-to-Device (D2D) communication by a device in a wireless communication system, the method comprising:

receiving a first Discovery Signal (DS) including identification information of a target user equipment from a member user equipment of a first user equipment group;

verifying whether or not the target user equipment belongs to the first user equipment group; and

transmitting a second DS corresponding to the first DS,

wherein, when the target user equipment belongs to the first user equipment group, the second DS is transmitted to member user equipments within the first user equipment group using a shared resource which is Spatial Division Multiplexing (SDM) multiplexed by members of the first user equipment group,

wherein, when the target user equipment does not belong to the first user equipment group, the second DS is transmitted to a specific user equipment within a second group that is different from the first group using a dedicated resource that is not shared by members of the first user equipment group, and

wherein the shared resource and the dedicated resource are multiplexed by using a Frequency Division Multiplexing (FDM) method.

2. The method of claim 1, wherein, when the target user equipment belongs to the first user equipment group, the second DS is transmitted by using a first transmission power,

wherein, when the target user equipment does not belong to the first user equipment group, the second DS is transmitted by using a second transmission power, and

wherein the first transmission power is lower than the second transmission power.

3. The method of claim 1, wherein the second DS includes a plurality of first DSs.

4. A device for performing a discovery procedure for Device-to-Device (D2D) communication in a wireless communication system, the device comprising:

a Radio Frequency (RF) unit; and

a processor,

wherein the processor is configured to;

receive a first Discovery Signal (DS) including identification information of a target user equipment from a member user equipment of a first user equipment group, to

verify whether or not the target user equipment belongs to the first user equipment group, and

transmit a second DS corresponding to the first DS,

wherein, when the target user equipment belongs to the first user equipment group, the second DS is transmitted to member user equipments within the first user equipment group using a shared resource which is Spatial Division Multiplexing (SDM) multiplexed by members of the first user equipment group,

wherein, when the target user equipment does not belong to the first user equipment group, the second DS is transmitted to a specific user equipment within a second group that is different from the first group using a dedicated resource that is not shared by members of the first user equipment group, and

wherein the shared resource and the dedicated resource are multiplexed by using a Frequency Division Multiplexing (FDM) method.

5. The device of claim 4, wherein, when the target user equipment belongs to the first user equipment group, the second DS is transmitted by using a first transmission power,

wherein, when the target user equipment does not belong to the first user equipment group, the second DS is transmitted by using a second transmission power, and

wherein the first transmission power is lower than the second transmission power.

6. The device of claim 4, wherein the second DS includes a plurality of first DSs.