Method for transmitting discovery message in wireless communication system and device therefor

• US 10,305,650 B2
• Filed: 11/03/2014
• Issued: 05/28/2019
• Est. Priority Date: 11/01/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation), Seoul National University R&DB Foundation (Seoul National University)
• Original Assignee: LG Electronics, Inc. (LG Corporation), Seoul National University R&DB Foundation (Seoul National University)
• Inventors: Kim, Hakseong, Seong, Seonik, Lee, Kwangbok
• Primary Examiner(s): Chen, Peter
• Application Number:
  US15/022,114
• Publication Number:
  US 20160294519A1
• Time in Patent Office: 1,667 Days
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• 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 5/008 once only, on installation
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A method for transmitting a discovery message in a wireless communication system supporting device-to-device (D2D) direct communication, the method performed by the device, includes: receiving discovery resource region information including multiple discovery resource partitions from a base station; determining one discovery resource partition among multiple discovery resource partitions by using discovery search information previously shared with specific D2D terminals; determining a discovery resource for transmitting a discovery message among discovery resources in the determined discovery resource partition through a predetermined resource selecting method; and transmitting the discovery message through the determined discovery resource.

Claims

1. A method, performed by a terminal, for transmitting a discovery message in a wireless communication system supporting Device-to-Device (D2D) direct communication, the method comprising:

receiving, from a base station, resource configuration information including a plurality of resource sets configured for transmitting the discovery message;

selecting a resource set from among the plurality of resource sets based on discovery search information, wherein the discovery search information is shared among specific terminals, including the terminal;

selecting at least one resource from among a plurality of resources included in the selected resource set, based on a pre-configured resource selecting scheme; and

transmitting the discovery message through the selected at least one resource,

wherein a transmission power of the discovery message is configured based on the following equation;

P_restricted=min(Z·

P_open,P_max)

wherein min(x,y) is a minimum value between x and y, P_restricted is a transmission power of the discovery message in a restricted discovery procedure, P_open is a transmission power of the discovery message in an open discovery procedure, P_max is a maximum transmission power of the terminal for transmitting the discovery message, and Z is received power information or interference information,

wherein the received power information includes a ratio between a minimum received power of the plurality of resource sets and a minimum received power of the selected resource set, and

wherein the interference information includes a ratio between an average interference of the plurality of resource sets and the selected resource set.

2. The method of claim 1, wherein selecting the resource set among the plurality of resource sets using the discovery search information comprises:

performing a hash function using the discovery search information; and

selecting the resource set using at least one resulting value of the hash function.

3. The method of claim 1, wherein the pre-configured resource selecting scheme is a greedy selection or a random selection.

4. The method of claim 1, wherein the discovery search information includes at least one of a terminal ID and an encryption key.

5. The method of claim 1, wherein the plurality of resource sets are used in the restricted discovery procedure.

6. A terminal for transmitting a discovery message in a wireless communication system supporting Device-to-Device (D2D) direct communication, the terminal comprising:

a transmitter and a receiver; and

a processor, operatively coupled to the transmitter and the receiver, wherein the processor is configured to;

control the receiver to receive, from a base station, resource configuration information including a plurality of resource sets configured for transmitting the discovery message;

select a resource set from among the plurality of resource sets based on discovery search information, wherein the discovery search information is shared among specific terminals including the terminal;

select at least one resource from among a plurality of resources included in the selected resource set, based on a pre-configured resource selecting scheme; and

control the transmitter to transmit the discovery message through the selected at least one resource,

wherein a transmission power of the discovery message is configured based on the following equation;

P_restricted=min(Z·

P_open,P_max)

wherein min(x,y) is a minimum value between x and y, P_restricted is a transmission power of the discovery message in a restricted discovery procedure, P_open is a transmission power of the discovery message in an open discovery procedure, P_max is a maximum transmission power of the terminal for transmitting the discovery message, and Z is received power information or interference information,

wherein the received power information includes a ratio between a minimum received power of the plurality of resource sets and a minimum received power of the selected resource set, and

wherein the interference information includes a ratio between an average interference of the plurality of resource sets and the selected resource set.

7. The terminal of claim 6, wherein the processor is further configured to:

perform a hash function using the discovery search information; and

select the resource set using at least one resulting value of the hash function.