Discovery method and apparatus for device to device communication in cellular mobile communication system

1. A discovery method performed by a discovery apparatus, the discovery method comprising:

transmitting, to a server, a service information request message requesting information associated with a service provided by one or more terminals;

obtaining, from the server, managing information associated with the one or more terminals providing the service using a device-to-device (D2D) communication scheme over a mobile communication network, wherein information associated with the service is provided by the one or more terminals;

selecting a service of interest based on the information associated with the service;

receiving, from a base station, information associated with a discovery radio resource allocated to a terminal providing the service of interest; and

discovering the terminal providing the service of interest based on the information associated with the discovery radio resource;

wherein the service information request message includes information associated with an identification (ID) of the base station and a category of the service of interest.

2. The discovery method of claim 1 , wherein the information associated with the service corresponds to information associated with a service corresponding to the category of the service of interest among services provided through the base station corresponding to the ID of the base station.

3. The discovery method of claim 1 , wherein the obtaining is performed when a client for D2D communication included in the discovery apparatus is executed or when a request for obtaining the information associated with the service is input from a user.

4. The discovery method of claim 1 , further comprising:

before the receiving,

transmitting a discovery information request message in a form of a non-access stratum (NAS) message to the base station, the discovery information request message requesting the information associated with the radio resource allocated to the terminal providing the service of interest.

5. The discovery method of claim 4 , wherein the discovery information request message includes information associated with an ID of the service of interest and a category of the service of interest received from the server.

6. The discovery method of claim 5 , wherein the discovery information request message is transmitted from the base station to a mobility management entity (MME) managing a radio bearer for D2D communication between the terminals providing the service using the D2D communication scheme, and

the MME requests the base station to provide the discovery apparatus with the information associated with the radio resource allocated to the terminal providing the service of interest, and the base station transmits, to the discovery apparatus, the information associated with the radio resource allocated to the terminal providing the service corresponding to the ID of the corresponding service of interest.

7. The discovery method of claim 6 , wherein the information associated with the radio resource is received, in a case in which the discovery apparatus performs a handover from the base station to other base station, by the MME transmitting, to other base station, the information associated with the category of the service of interest included in the discovery information request message received from the base station, and by the base station transmitting, to the discovery apparatus, the information associated with the radio resource allocated to the terminal providing the service corresponding to the category of the service of interest.

8. The discovery method of claim 1 , wherein the discovering comprises discovering the terminal providing the service of interest by measuring proximity with the terminal providing the service of interest based on the information associated with the radio resource.

9. A discovery apparatus comprising:

an obtaining unit to obtain, from a server managing information associated with one or more terminals providing a service using a device-to-device (D2D) communication scheme over a mobile communication network, information associated with a service provided by the terminals;

a selection unit to select a service of interest based on the information associated with the service;

a discovery unit to discover a terminal providing the service of interest based on information associated with a discovery radio resource allocated to the terminal providing the service of interest received from a base station; and

a transmission unit to transmit, to the server, a service information request message requesting information associated with the service provided by the terminals;

wherein the service information request message includes information associated with an identification (ID) of the base station and a category of the service of interest, and the information associated with the service corresponds to information associated with a service corresponding to the category of the service of interest among services provided through the base station corresponding to the ID of the base station.

10. The discovery apparatus of claim 9 , wherein the obtaining unit obtains the information associated with the service when a client for D2D communication included in the discovery apparatus is executed or when a request for obtaining the information associated with the service is input from a user.

11. The discovery apparatus of claim 9 , wherein the transmission unit transmits, to the base station, a discovery information request message in a form of a non-access stratum (NAS) message, the discovery information request message requesting the information associated with the radio resource allocated to the terminal providing the service of interest.

12. The discovery apparatus of claim 11 , wherein the discovery information request message includes information associated with an ID of the service of interest and a category of the service of interest received from the server.

13. The discovery apparatus of claim 12 , wherein the discovery information request message is transmitted from the base station to a mobility management entity (MME) managing a radio bearer for D2D communication between the terminals providing the service using the D2D communication scheme, and

the MME transmits the information associated with the service of interest to the base station, and the base station transmits, to the discovery apparatus, the information associated with the radio resource allocated to the terminal providing the service of interest based on the ID of the service of interest.

14. The discovery apparatus of claim 13 , wherein the information associated with the radio resource is received, in a case in which the discovery apparatus performs a handover from the base station to other base station, by the MME transmitting, to other base station, the information associated with the category of the service of interest included in the discovery information request message received from the base station, and by other base station transmitting, to the discovery apparatus, the information associated with the radio resource allocated to the terminal providing the service corresponding to the category of the service of interest based on the information associated with the category of the service of the interest.

15. The discovery apparatus of claim 9 , wherein the discovery unit discovers the terminal providing the service of interest by measuring proximity with the terminal providing the service of interest based on the information associated with the radio resource.