Method and apparatus for acquiring control information in wireless communication system

1. A method of obtaining control information by a D2D (device-to-device) user equipment in a wireless communication system, the method comprising:

determining a resource region in which the control information is transmitted based on a D2D occupied bandwidth;

and

obtaining the control information in the determined resource region,

wherein determining the resource region in which the control information is transmitted comprises:

determining a number of resource blocks (RBs) in which the control information is transmitted based on the D2D occupied bandwidth;

determining a number of resource elements (REs) in which the control information is transmitted in an RB based on the D2D occupied bandwidth;

determining a position of an RB in which the control information is transmitted based on the D2D occupied bandwidth; and

determining a position of the RE in which the control information is transmitted in the RB based on the D2D occupied bandwidth,

wherein the position of the RB in which the control information is transmitted is repeated within the D2D occupied bandwidth from a specific RB position at a specific interval,

wherein the specific RB position corresponds to a first quotient obtained by dividing a number of RBs configuring the D2D occupied bandwidth by the transmitted, and

wherein the specific interval corresponds to a second quotient obtained by dividing the number of RBs configuring the D2D occupied bandwidth by twice the determined number of RBs in which the control information is transmitted.

2. The method claim 1 , wherein the position of the RB in which the control information is transmitted is determined based on the number of RBs configuring the D2D occupied bandwidth and the determined number of RBs in which the control information is transmitted.

3. The method of claim 2 , wherein the position of the RB in which the control information is transmitted is further determined based on the following equation:

Y

i

=

⌊

M

N

⌋

⁢

i

+

⌊

M

2

⁢

N

⌋

wherein M corresponds to the number of RBs configuring the D2D occupied bandwidth,

wherein N corresponds to the determined number of RBs in which the control information is transmitted, and

wherein i=0, . . . , N−1.

4. The method of claim 1 , wherein the position of the RE in which the control information is transmitted is determined based on the determined number of REs in which the control information is transmitted.

5. The method of claim 4 , wherein the position of the RE in which the control information is transmitted is further determined in advance in an RB of an RE set corresponding to the determined number of REs in which the control information is transmitted.

6. The method of claim 5 , wherein the position of the RE in which the control information is transmitted is further determined by a combination of at least two RE sets if there is no RE set corresponding to the determined number of REs in which the control information is transmitted.

7. The method of claim 6 , wherein the determined position of the RE in which the control information is transmitted does not overlap in the at least two or more RE sets.

8. The method of claim 1 , wherein the D2D occupied bandwidth is signaled by a base station or a cluster head user equipment.

9. A D2D (device-to-device) user equipment (UE) in a wireless communication system, the UE comprising:

a reception module configured to receive information; and

a processor configured to:

determine a resource region in which control information is transmitted; and

obtain the control information in the determined resource region based on a D2D occupied bandwidth,

wherein determining the resource region in which the control information is transmitted comprises:

determining a number of resource blocks (RBs) in which the control information is transmitted based on the D2D occupied bandwidth;

determining a number of resource elements (REs) in which the control information is transmitted in an RB based on the D2D occupied bandwidth;

determining a position of an RB in which the control information is transmitted based on the D2D occupied bandwidth; and

determining a position of the RE in which the control information is transmitted in the RB based on the D2D occupied bandwidth,

wherein the position of the RB in which the control information is transmitted is repeated within the D2D occupied bandwidth from a specific RB position at a specific interval,

wherein the specific RB position corresponds to a first quotient obtained by dividing a number of RBs configuring the D2D occupied bandwidth by the determined number of RBs in which the control information is transmitted, and

wherein the specific interval corresponds to a second quotient obtained by dividing the number of RBs configuring the D2D occupied bandwidth by twice the determined number of RBs in which the control information is transmitted.

10. The method claim 9 , wherein the position of the RB in which the control information is transmitted is determined based on the number of RBs configuring the D2D occupied bandwidth and the determined number of RBs in which the control information is transmitted.

11. The UE of claim 10 , wherein the position of the RB in which the control information is transmitted is further determined based on the following equation:

Y

i

=

⌊

M

N

⌋

⁢

i

+

⌊

M

2

⁢

N

⌋

wherein M corresponds to the determined number of RBs configuring the D2D occupied bandwidth,

wherein N corresponds to the number of RBs in which the control information is transmitted, and

wherein i=0, . . . , N−1.

12. The UE of claim 9 , wherein the position of the RE in which the control information is transmitted is determined based on the determined number of REs in which the control information is transmitted.

13. The UE of claim 12 , wherein the position of the RE in which the control information is transmitted is further determined in advance in an RB of an RE set corresponding to the determined number of REs in which the control information is transmitted.

14. The UE of claim 13 , wherein the position of the RE in which the control information is transmitted is further determined by a combination of at least two RE sets if there is no RE set corresponding to the determined number of REs in which the control information is transmitted.

15. The UE of claim 14 , wherein the determined position of the RE in which the control information is transmitted does not overlap in the at least two RE sets.

16. The UE of claim 9 , wherein the D2D occupied bandwidth is signaled by a base station or a cluster head user equipment.