Method and apparatus for device-to-device direct communication

1. A direct communication method by a device in a device-to-device (D2D) direct communication, the method comprising:

setting at least one frame among a plurality of frames included in a superframe to a frame type 0 which is sectionized into a synchronization region for performing a synchronization procedure, a discovery region for discovering devices, a peering region for a connection, and a data region for scheduling of resources and data transmission;

setting remaining frames among the plurality of frames to a frame type 1 which is sectionized into the synchronization region and the data region;

transmitting or receiving signals in the synchronization region, the discovery region, the peering, and the data region;

determining a channel state by interference sensing in at least one region among the discovery region, the peering region, and the data region; and

using a resource of an interval in which the channel state is idle.

2. The method of claim 1 , wherein the frame that is set to the frame type 0 is a frame that is located at head of the superframe.

3. The method of claim 1 , wherein the synchronization region is located at head of each of the frames.

4. The method of claim 1 , wherein transmitting or receiving signals includes repeatedly transmitting a synchronization signal in the synchronization region.

5. The method of claim 1 , further comprising:

transmitting a blocking signal for preventing intrusion of different kinds of terminals in the interval in which the resource is used.

6. The method of claim 5 , wherein transmitting the blocking signal includes transmitting the blocking signal through at least one subcarrier.

7. The method of claim 5 , wherein the discovery region includes a plurality of resource unit groups and a plurality of interference sensing intervals for performing the interference sensing, each of the resource unit groups including a plurality of resource units, and following a corresponding one of the interference sensing intervals.

8. The method of claim 5 , wherein the peering region includes a peering request/response interval for establishing a peering identity (PID) and a PID broadcast interval for broadcasting the PID,

wherein the peering request/response includes a plurality of first resource unit groups and a plurality of first interference sensing intervals for performing the interference sensing, each of the first resource unit groups including a plurality of resource units, and following a corresponding one of the first interference sensing intervals, and

wherein the PID broadcast interval includes a second resource unit group including a plurality of resource unit and a second interference sensing interval for performing the interference sensing and followed by the second resource unit group.

9. The method of claim 5 , wherein the data region includes a scheduling interval for scheduling of resources and a data interval for transmission of data bursts,

wherein the scheduling includes a resource unit group including a plurality of resource units and an interference sensing interval for performing the interference sensing and followed by the resource unit group,

the data interval includes a plurality of data burst intervals and a plurality of feedback intervals respectively corresponding to the data burst intervals,

a number of the data burst intervals and a length of each of the data burst intervals are varied according to a result of the scheduling.

10. A direct communication apparatus by a device in a device-to-device (D2D) direct communication, the method comprising:

setting a superframe; and

transmitting or receiving signals in the superframe,

wherein the superframe includes a plurality of frames,

wherein the plurality of frames include a frame type 0 and a frame type 1 ,

wherein the frame type 0 is sectionized into a synchronization region for performing a synchronization procedure, a discovery region for discovering devices, a peering region for a connection, and a data region for scheduling of resources and data transmission,

wherein the frame type 1 is sectionized into the synchronization region and the data region,

wherein at least one region among the discovery region, the peering region and the data region includes:

a first interval for determining a channel state by interference sensing; and

a second interval following the first interval and including a plurality of resource units, and

wherein transmitting or receiving signals includes:

using a resource of the second interval when it is determined in the first interval that the channel state is idle; and

transmitting a blocking signal for preventing intrusion of different kinds of terminals in the second interval in which the resource is used.

11. The method of claim 10 , wherein a frame that is located at head of the superframe is the frame type 0 , and remaining frames are the frame type 1 .

12. The method of claim 10 , wherein the synchronization region is located at head of each of the frames.

13. A direct communication apparatus in a device-to-device (D2D) direct communication, the apparatus comprising:

a frame generator configured to set a superframe; and

a transceiver configured to transmit or receive signals in the superframe,

wherein the superframe includes a plurality of frames,

wherein the plurality of frames include a frame type 0 and a frame type 1 ,

wherein the frame type 0 is sectionized into a synchronization region for performing a synchronization procedure, a discovery region for discovering devices, a peering region for a connection, and a data region for scheduling of resources and data transmission,

wherein the frame type 1 is sectionized into the synchronization region and the data region, and

wherein at least one region among the discovery region, the peering region and the data region includes:

a first interval for determining a channel state by interference sensing; and

a second interval following the first interval and including a plurality of resource units, and

wherein the transceiver uses a resource of the second interval when it is determined in the first interval that the channel state is idle, and transmits a blocking signal for preventing intrusion of different kinds of terminals in the second interval in which the resource is used.

14. The apparatus of claim 13 , wherein a frame that is located at head of the superframe is the frame type 0 , and remaining frames are the frame type 1 .

15. The apparatus of claim 13 , wherein the synchronization region is located at head of each of the frames.