METHOD FOR ALLOWING BASE STATION TO SUPPORT DEVICE-TO-DEVICE (D2D) COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM, AND METHOD FOR ALLOWING D2D DEVICE TO EFFICIENTLY TRANSMIT D2D COMMUNICATION REQUEST SIGNAL

• US 20140286284A1
• Filed: 10/24/2012
• Published: 09/25/2014
• Est. Priority Date: 10/24/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lim, Dongguk, Cho, Hangyu
• Granted Patent: US 10,034,317 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/003 Arrangements for allocating sub-channels of the transmission path
• CPC Class Codes: H04W 72/121 for groups of terminals or users
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

Method for supporting device-to-device (D2D) communication by a base station includes: receiving first signals for requesting D2D communication from a plurality of first D2D devices; identifying number of D2D devices which have requested the D2D communication based upon the first signals; allocating resources for transmitting a second signal for requesting D2D communication between the D2D devices based upon number of the plurality of first D2D devices which have been identified; and transmitting information on the allocated resources to the plurality of first D2D devices, wherein the resource allocation can be performed to distinguish combinations of an index of a D2D device, which transmits the second signal, and an index of a D2D device, which receives the second signal, from each other with respect to at least one of time, frequency, code, and space domains with respect to the plurality of first D2D devices.

Claims

1. A method for supporting device-to-device (D2D) communication by a base station (BS) in a wireless communication system, the method comprising:

receiving first signals for requesting D2D communication from a plurality of first D2D devices;

obtaining number of first D2D devices requesting D2D communication based upon the first signals;

allocating resources for transmitting a second signal for requesting D2D communication between D2D devices based upon the obtained number of first D2D devices; and

transmitting information on the allocated resources to the plurality of first D2D devices which have transmitted the first signals,

wherein the resources are allocated such that the resources are discriminated by combinations of an index of a D2D device which transmits the second signal and an index of a D2D device which receives the second signal in at least one of time, frequency, code, and spatial domains, with respect to the plurality of first D2D devices which have transmitted the first signals.

2. The method according to claim 1, wherein the information on the allocated resources includes at least one of information on the obtained number of first D2D devices and information on a mapping rule with respect to identifiers of the plurality of first D2D devices which have transmitted the first signals and the number of first D2D devices.

3. The method according to claim 1, further comprising:

transmitting information on a transmission interval in which the first signals are transmitted to the plurality of first D2D devices,

wherein the first signals are received in a first transmission interval included in the information on the transmission interval.

4. The method according to claim 3, further comprising:

receiving the first signals from a plurality of second D2D devices in a second transmission interval;

obtaining the number of the plurality of second D2D devices based upon the first signals received in the second transmission interval; and

reallocating resources for transmitting the second signal based upon the obtained number of the second D2D devices.

5. The method according to claim 1, further comprising:

grouping the plurality of first D2D devices into a plurality of groups,

wherein the resources for transmitting the second signal are allocated per group on the basis of the detected number of the first D2D devices, and information on the allocated resources is transmitted to each group.

6. The method according to claim 5, wherein the resources allocated per group are discriminated in at least one of time, frequency, code and spatial domains, or the resources are allocated such that the resources are discriminated for combinations of an index of a D2D device which transmits the second signal and an index of a D2D device which receives the second signal in at least one of time, frequency, code, and spatial domains.

7. The method according to claim 4, further comprising:

transmitting information on number of groups obtained by grouping the plurality of first D2D devices.

8. The method according to claim 1, wherein the information on the allocated resources is transmitted through a broadcast channel or a control channel.

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

transmitting a first signal for requesting D2D communication to a BS;

receiving, from the BS, information on resources allocated to transmit a second signal for requesting D2D communication between D2D devices; and

transmitting the second signal to at least another D2D device through the allocated resources,

wherein the resources are allocated based upon number of D2D devices for requesting D2D communication based on the first signal,

wherein the resources are allocated such that the resources are discriminated for combinations of an index of the D2D device which transmits the first signal and an index of the at least one D2D device which receives the second signal in at least one of time, frequency, code, and spatial domains, with respect to the plurality of first D2D devices which have transmitted the first signals.

10. The method according to claim 9, wherein the index of the D2D device which transmits the first signal and the index of the at least one D2D device which receives the second signal correspond to one of a station identifier (STID), a cell-radio network temporary identifier (C-RNTI), a D2D dedicated ID, a peer discovery ID set through peer discovery and a D2D logical number allocated by a BS.

11. The method according to claim 9, wherein the combinations of the index of the D2D device which transmits the first signal and the index of the at least one D2D device which receives the second signal are allocated and discriminated on a symbol basis in the time domain and a subcarrier or carrier basis in the frequency domain.

12. A base station (BS) of supporting D2D communication in a wireless communication system, the BS comprising:

a receiver configured to receive first signals requesting D2D communication from a plurality of first D2D devices;

a processor configured to obtain number of first D2D devices requesting D2D communication based upon the first signals and to allocate resources for transmitting a second signal requesting D2D communication between D2D devices baed upon the obtained number of first D2D devices; and

a transmitter configured to transmit information on the allocated resources to the plurality of first D2D devices which have transmitted the first signals,

wherein resource allocation by the processor is performed such that the resources are discriminated for combinations of an index of a D2D device which transmits the second signal and an index of a D2D device which receives the second signal in at least one of time, frequency, code, and spatial domains, with respect to the plurality of first D2D devices which have transmitted the first signals.

13. A device-to-to device (D2D) device for transmitting a signal in a wireless communication system, the D2D device comprising:

a transmitter configured to transmit a first signal for requesting D2D communication to a BS;

a receiver configured to receive, from the BS, information on resources allocated to transmit a second signal for requesting D2D communication between D2D devices; and

a processor configured to control the D2D device to transmit the second signal to at least another D2D device through the allocated resources,

wherein the resources are allocated based upon the number of D2D devices for requesting D2D communication according to the first signal,

wherein the resources are allocated such that the resources are discriminated for combinations of an index of the D2D device which transmits the first signal and an index of the at least one D2D device which receives the second signal in at least one of time, frequency, code, and spatial domains, with respect to the plurality of first D2D devices which have transmitted the first signals.