METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN D2D NETWORK

• US 20160014812A1
• Filed: 07/10/2015
• Published: 01/14/2016
• Est. Priority Date: 07/11/2014
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: PARK, Ok-Sun, KIM, Ji Hyung, BANG, Seung Chan, LEE, Moon-Sik
• Application Number:
  US14/796,603
• Publication Number:
  US 20160014812A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0033 each allocating device acting autonomously, i.e. without negotiation with other allocating devices
• 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 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

A method of sending control information including selecting an available physical resource block (PRB) in a control subframe included in a D2D frame and sending the control information using the available PRB, and a terminal for realizing the method, are provided.

Claims

1. A method of transmitting control information by a terminal performing device-to-device (D2D) communication, the method comprising:

selecting an available physical resource block (PRB) in a control subframe included in a D2D frame; and

sending the control information using the available PRB.

2. The method of claim 1, wherein selecting the PRB comprises:

randomly selecting a first PRB in the control subframe; and

determining whether the first PRB is the available PRB based on a reference signal (RS) received in the first PRB.

3. The method of claim 2, wherein determining whether the first PRB is the available PRB comprises:

determining whether a signal has been detected in the first PRB based on an RS sequence and the received RS; and

determining the first PRB to be the available PRB if it is determined that a signal has not been detected in the first PRB.

4. The method of claim 3, further comprising:

randomly selecting a second PRB in a control subframe next to the control subframe if it is determined that a signal has been detected in the first PRB; and

determining whether the second PRB is the available PRB based on an RS received in the second PRB.

5. The method of claim 3, wherein determining whether a signal has been detected in the first PRB comprises:

calculating a decision metric based on a correlation between the RS sequence and the received RS; and

determining that a signal has been detected in the first PRB if the decision metric is equal to or greater than a threshold value and determining that a signal has not been detected in the first PRB if the decision metric is smaller than a threshold value.

6. The method of claim 5, wherein the decision metric is a ratio between a maximum value of the correlation and a normalized average value of the correlation.

7. The method of claim 1, wherein the control subframe is repeated at an interval of a scheduling allocation (SA) period in the D2D frame.

8. The method of claim 1, further comprising sensing the available PRB using a predetermined sensing period as a period.

9. The method of claim 1, further comprising sensing the available PRB in a control subframe included in a predetermined sensing period.

10. The method of claim 1, wherein a size of the available PRB is 2.

11. A terminal performing device-to-device (D2D) communication, comprising:

at least one processor;

a memory; and

a radio frequency (RF) unit,

wherein the at least one processor selects an available physical resource block (PRB) in a control subframe included in a D2D frame and sends the control information using the available PRB by executing at least one program stored in the memory.

12. The terminal of claim 11, wherein when selecting the PRB, the at least one processor randomly selects a first PRB in the control subframe and determines whether the first PRB is the available PRB based on a reference signal (RS) received in the first PRB.

13. The terminal of claim 12, wherein when determining whether the first PRB is the available PRB, the at least one processor determines whether a signal has been detected in the first PRB based on an RS sequence and the received RS and determines the first PRB to be the available PRB if it is determined that a signal has not been detected in the first PRB.

14. The terminal of claim 13, wherein the at least one processor randomly selects a second PRB in a control subframe next to the control subframe if it is determined that a signal has been detected in the first PRB and determines whether the second PRB is the available PRB based on an RS received in the second PRB by executing the at least one program.

15. The terminal of claim 13, wherein when determining whether a signal has been detected in the first PRB, the at least one processor calculates a decision metric based on a correlation between the RS sequence and the received RS, and determines that a signal has been detected in the first PRB if the decision metric is equal to or greater than a threshold value and determines that a signal has not been detected in the first PRB if the decision metric is smaller than a threshold value.

16. The terminal of claim 15, wherein the decision metric is a ratio between a maximum value of the correlation and a normalized average value of the correlation.

17. The terminal of claim 11, wherein the control subframe is repeated at an interval of a scheduling allocation (SA) period in the D2D frame.

18. The terminal of claim 11, wherein the at least one processor senses the available PRB using a predetermined sensing period as a period by executing the at least one program.

19. The terminal of claim 11, wherein the at least one processor senses the available PRB in a control subframe included in a predetermined sensing period by executing the at least one program.

20. The terminal of claim 11, wherein a size of the available PRB is 2.