Method and apparatus for generating connection identifier for device-to-device communication

A method for generating a Connection Identifier (CID) for Device-to-Device (D2D) communication, the method comprising:

• receiving a request signal for requesting direct communication between a transmitting device and a receiving device from the transmitting device on a resource unit of a first resource index determined based on at least one of a device ID of the transmitting device and a device ID of the receiving device during a predetermined first period;
• receiving information about at least one used CID being used by at least one surrounding device from the surrounding device during a second period following the first period;
• receiving generation information including at least one CID available by the transmitting device from the transmitting device on a resource unit of a second resource index being identical to the first resource index during a third period following the second period;
• and
• selecting at least one CID to be used for D2D communication between the transmitting device and the receiving device based on the generation information.

A transmitting device for generating a Connection Identifier (CID) for Device-to-Device (D2D) communication, the transmitting device comprising:

• a controller for determining a first resource index for transmitting a request signal for requesting direct communication between a transmitting device and a receiving device, and a second resource index being identical to the first resource index, based on at least one of a device ID of the transmitting device and a device ID of the receiving device;
• a transmitter for transmitting the request signal on a resource unit of the first resource index during a predetermined first period;
• and
• a receiver for receiving information about at least one used CID being used by at least one surrounding device from the surrounding device during a second period following the first period,
• wherein the controller controls the transmitter to transmit generation information including at least one available CID acquired during the second period, on a resource unit of the second resource index during a third period following the second period, and determines at least one CID to be used for D2D communication between the transmitting device and the receiving device based on the generation information.

A receiving device for generating a Connection Identifier (CID) for Device-to-Device (D2D) communication, the receiving device comprising:

• a controller for determining a first resource index for receiving a request signal for requesting direct communication between a transmitting device and a receiving device and a second resource index being identical to the first resource index, based on at least one of a device ID of the transmitting device and a device ID of the receiving device;
• a receiver for receiving the request signal from the transmitting device on a resource unit of the first resource index during a predetermined first period, receiving information about at least one used CID being used by at least one surrounding device from the surrounding device during a second period following the first period, and receiving generation information including at least one CID available by the transmitting device from the transmitting device on a resource unit of the second resource index during a third period following the second period;
• and
• a transmitter,
• wherein the controller selects at least one CID to be used for D2D communication between the transmitting device and the receiving device, based on the generation information.