METHOD AND APPARATUS FOR CONDUCTING DEVICE-TO-DEVICE COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM

• US 20160183219A1
• Filed: 08/08/2014
• Published: 06/23/2016
• Est. Priority Date: 08/09/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Myoungseob, KIM, Hakseong, SEO, Hanbyul
• Granted Patent: US 10,172,115 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 52/38 TPC being performed in particular situations
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

A method for performing Device-to-Device (D2D) communication in a wireless communication system according to the present invention, the method according to the present invention comprises transmitting, by a D2D transmitting UE, a first message requesting allocation of radio resources to be used for D2D communication to an eNB; receiving, by the D2D transmitting UE, a second message including radio resource allocation information from the eNB; and transmitting, by the D2D transmitting UE, data through a radio resource area allocated by the second message, wherein the data are transmitted to the eNB and at least one D2D receiving UE.

Claims

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

transmitting, by a D2D transmitting UE, a first message requesting allocation of radio resources to be used for D2D communication to an eNB;

receiving, by the D2D transmitting UE, a second message including radio resource allocation information from the eNB; and

transmitting, by the D2D transmitting UE, data through a radio resource area allocated by the second message,

wherein the data are transmitted to the eNB and at least one D2D receiving UE.

2. The method of claim 1, wherein the data are transmitted to the eNB repeatedly by a predetermined number of times.

3. The method of claim 1, further comprising receiving, by the D2D transmitting UE, a response related to the data transmission from the eNB.

4. The method of claim 1, wherein, if the data transmission fails, the data are re-transmitted to the at least one D2D receiving UE from the eNB.

5. The method of claim 1, wherein the D2D transmitting UE and part of the at least one D2D receiving UE form a group, and the D2D transmitting UE receives a response related to the uplink data transmission from a D2D receiving UE included in the group.

6. The method of claim 1, wherein the allocated radio resource area includes a D2D link signal transmission interval and a Guard Interval (GI),

wherein the GI is a time interval for switching from a transmission mode to a reception mode or vice versa.

7. The method of claim 6, wherein the GI is disposed at either of the front and rear part of the D2D link signal transmission interval.

8. The method of claim 7, wherein the GI is part of a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol interval or an SC-FDMA 1 symbol.

9. The method of claim 1, wherein the D2D transmitting UE and the at least one D2D receiving UE are in an idle state.

16. The method of claim 1, further comprising relaying, by the D2D transmitting UE, the second message to a specific D2D UE if the specific D2D UE among the at least one D2D receiving UE is located outside the network coverage supported by the eNB.

10. A method for performing D2D communication in a wireless communication system, the method comprising:

transmitting, by a D2D transmitting UE, a first message requesting allocation of radio resources to be used for D2D communication to a cluster head UE;

receiving, by the D2D transmitting UE, a second message including radio resource allocation information from the cluster head UE; and

transmitting, by the D2D transmitting UE, data through a radio resource area allocated by the second message,

wherein the data are transmitted to the cluster head UE and at least one D2D receiving UE; and

wherein the D2D transmitting UE, the cluster head UE, and the at least one D2D receiving UE form a cluster.

11. The method of claim 10, wherein a second message transmitted from the cluster head UE is monitored by the at least one D2D receiving UE.

12. The method of claim 11, wherein the radio resource allocation information includes timing information related to signal transmission and/or signal reception of each D2D UE.

13. The method of claim 12, wherein the timing information is a period or an offset.

14. The method of claim 10, wherein the cluster size is changed according to a cell loading factor, and

if the cell loading factor is larger than a threshold, the cluster size becomes small whereas the cluster size becomes large if the cell loading factor is smaller than the threshold.

15. The method of claim 14, wherein, if the cluster size becomes small, transmission power of D2D UEs within the cluster is set to a low value

whereas transmission power of D2D UEs within the cluster is set to a high value if the cluster size becomes large.

17. A D2D transmitting UE for performing D2D communication in a wireless communication system, the D2D transmitting UE comprising:

a communication unit configured to communicate with the outside in a wireless or a wired manner; and

a processor functionally connected to the communication unit, wherein the processor is configured

to transmit a first message requesting allocation of radio resources to be used for D2D communication to an eNB;

to receive a second message including radio resource allocation information from the eNB; and

to transmit data through a radio resource area allocated by the second message,

wherein the data are transmitted to the eNB and at least one D2D receiving UE.

18. The D2D transmitting UE of claim 17, wherein the processor is configured to relay the second message to a specific D2D UE if the specific D2D UE among the at least one D2D receiving UE is located outside the network coverage supported by the eNB.

19. A D2D transmitting UE for performing D2D communication in a wireless communication system, the D2D transmitting UE comprising:

a communication unit configured to communicate with the outside in a wireless or a wired manner; and

a processor functionally connected to the communication unit, wherein the processor is configured

to transmit a first message requesting allocation of radio resources to be used for D2D communication to a cluster head UE;

to receive a second message including radio resource allocation information from the cluster head UE; and

to transmit data through a radio resource area allocated by the second message,

wherein the data are transmitted to the cluster head UE and at least one D2D receiving UE; and

wherein the D2D transmitting UE, the cluster head UE, and the at least one D2D receiving UE form a cluster.