Information exchange method and apparatus for D2D communication

A device operating in a mobile communication system, the device comprising:

• at least one processor configured to:
• transmit a device to device (D2D) request signal to a base station, wherein the D2D request includes at least one of device information, paired neighbor device information, pairing connection information, pairing resource information, and device buffer size,
• receive information associated with a discovery signal and information associated with a pairing signal from the base station, wherein the information associated with the discovery signal and the information associated with the pairing signal includes an identification of a resource region to use when transmitting or receiving the discovery signal and the pairing signal based on the D2D request,
• determine a resource to receive the pairing signal for the device,
• transmit the discovery signal including information related to the determined resource to receive the pairing signal within a first period,
• receive, from a neighbor device that received the discovery signal, the pairing signal within a second period using a resource determined based on the information related to the determined resource to receive the pairing signal for the device, and
• control the device to communicate a data signal with the paired neighbor device during a third period,
• wherein the resource for transmitting the pairing signal for the device is selected based on at least one signal received by the neighbor device during the first period.

A signal transmission/reception method of a base station in a mobile communication system, the method comprising:

• receiving, by the base station, a device to device (D2D) request signal from a device, wherein the D2D request includes at least one of device information, paired neighbor device information, pairing connection information, pairing resource information, and device buffer size;
• and
• transmitting, from the base station to the device, information associated with a discovery signal and information associated with a pairing signal, wherein the information associated with the discovery signal and the information associated with the pairing signal includes an identification of a resource region to use when transmitting or receiving the discovery signal and the pairing signal based on the D2D request,
• wherein the device is configured to:
• determine a resource to receive a pairing signal for the device based on the information associated with the pairing signal,
• transmit the discovery signal including information related to the determined resource to receive the pairing signal for the device within a first period using the information associated with the discovery signal, and
• receive the pairing signal for the device from a neighbor device that received the discovery signal, the pairing signal for the device received within a second period using a resource determined based on the information related to the determined resource to receive the pairing signal for the device, and
• wherein the resource for transmitting the pairing signal for e device is selected based on at least one signal received by the neighbor device during the first period.

A base station of a mobile communication system, the base station comprising:

• at least one processor configured to:
• receive, from the device, a device to device (D2D) request signal, wherein the D2D request includes at least one of device information, paired neighbor device information, pairing connection information, pairing resource information, and device buffer size;
• and
• transmit to the device information associated with a discovery signal and information associated with a pairing signal, wherein the information associated with the discovery signal and the information associated with the pairing signal includes an identification of a resource region to use when transmitting or receiving the discovery signal and the pairing signal based on the D2D request,
• wherein the device is configured to:
• determine a resource to receive a pairing signal for the device based on the information associated with the pairing signal,
• transmit the discovery signal including information related to the determined resource to receive the pairing signal for the device within a first period using the information associated with the discovery signal, and
• receive the pairing signal for the device from a neighbor device that received the discovery signal, the pairing signal for the device received within a second period using a resource determined based on the information related to the determined resource to receive the pairing signal for the device, and
• wherein the resource for transmitting the pairing signal for e device is selected based on at least one signal received by the neighbor device during the first period.