Device to device communication method and apparatus

1. A method of a user equipment (UE) for device to device (D2D) communication, the method comprising:

receiving, via a system information block, resource configuration information broadcasted by a base station, the resource configuration information comprising first information indicating D2D transmission resources for D2D discovery and second information indicating D2D reception resources for D2D discovery;

transmitting a D2D discovery signal on the D2D transmission resources indicated in the first information; and

monitoring the D2D transmission resources indicated by the first information and the D2D reception resources indicated by the second information to receive at least one D2D discovery signal transmitted by another D2D UE on a same frequency as allocated by the serving cell to the UE,

wherein the D2D transmission resources indicated by the first information are commonly used by UEs in the serving cell,

wherein the D2D transmission resources are used for transmitting the D2D discovery signal by the UE in an idle state, and

wherein the receiving and the monitoring is performed by the UE in the idle state.

2. The method of claim 1 , wherein the D2D reception resources comprise the D2D transmission resources indicated by the first information and D2D transmission resources configured in each detected neighbor cell.

3. The method of claim 1 , wherein the D2D transmission resources comprise first D2D transmission resources commonly used in the serving cell and neighboring cells and second D2D transmission resources being specific to the serving cell.

4. A method of a base station for supporting a device to device (D2D) communication method, the method comprising:

generating resource configuration information comprising first information indicating D2D transmission resources for D2D discovery and second information indicating D2D reception resources for D2D discovery; and

broadcasting, via a system information block, the resource configuration information in a serving cell,

wherein the D2D transmission resources indicated by the first information are used for transmitting a D2D discovery signal by a user equipment (UE) in an idle state in the serving cell, and the D2D reception resources are used for receiving at least one D2D discovery signal transmitted by the UE in the serving cell and another D2D UE on a same frequency as allocated by the serving cell to the UE,

wherein the D2D transmission resources indicated by the first information are commonly used by UEs in the serving cell, and

wherein the resource configuration information is broadcasted to the UE in the idle state and the D2D transmission resources and the D2D reception resources included in the resource configuration information are to be monitored by the UE in the idle state.

5. An apparatus of a user equipment (UE) for device to device (D2D) communication, the apparatus comprising:

a transceiver configured to:

receive, via a system information block, resource configuration information broadcasted by a base station, the resource configuration information comprising first information indicating D2D transmission resources for D2D discovery and second information indicating D2D reception resources for D2D discovery,

transmit a D2D discovery signal on the D2D transmission resources indicated in the first information, and

monitor the D2D transmission resources indicated by the first information and the D2D reception resources indicated by the second information to receive at least one D2D discovery signal transmitted by another D2D UE on a same frequency as allocated by the serving cell to the UE; and

a controller configured to determine the D2D transmission resources and the D2D reception resources based on the resource configuration information,

wherein the D2D transmission resources indicated by the first information are commonly used by UEs in the serving cell,

wherein the D2D transmission resources are used for transmitting the D2D discovery signal by the UE in an idle state, and

wherein the receiving and the monitoring is performed by the UE in the idle state.

6. The apparatus of claim 5 , wherein the D2D reception resources comprise the D2D transmission resources indicated by the first information and D2D transmission resources configured in each detected neighbor cell.

7. The apparatus of claim 5 , wherein the D2D transmission resources comprise first D2D transmission resources commonly used in the serving cell and neighboring cells and second D2D transmission resources being specific to the serving cell.

8. An apparatus of a base station for supporting device to device (D2D) communication, the apparatus comprising:

a controller configured to generate resource configuration information comprising first information indicating D2D transmission resources for D2D discovery and second information indicating D2D reception resources for D2D discovery; and

a transceiver configured to broadcast, via a system information block, the resource configuration information in a serving cell,

wherein the D2D transmission resources indicated by the first information are used for transmitting a D2D discovery signal by a user equipment (UE) in an idle state in the serving cell,

wherein the D2D reception resources are used for receiving at least one D2D discovery signal transmitted by the UE in the serving cell and another D2D UE on a same frequency as allocated by the serving cell to UE,

wherein the D2D transmission resources indicated by the first information are commonly used by UEs in the serving cell, and

wherein the resource configuration information is broadcasted to the UE in the idle state and the D2D transmission resources and the D2D reception resources included in the resource configuration information are to be monitored by the UE in the idle state.