Methods and apparatus for device-to-device communications system

A method for device-to-device (D2D) communication, the method comprising:

• receiving, by a user equipment (UE) information regarding one or more resource pools configured by a base station for device-to-device D2D communication, the information received via a radio resource control (RRC) message including a system information block for D2D communication in a broadcast control channel (BCCH);
• transmitting, by the UE to the base station, a message for indication of D2D communication, wherein the message includes information on a frequency on which the UE is interested for the D2D communication and a priority of the D2D communication;
• transmitting, by the UE to the base station, a request for one or multiple D2D communication resources for D2D communication and transmitting a buffer status report for D2D communication, wherein the UE is configured to transmit D2D messages, and wherein the request for one or more D2D communication resources is transmitted using a random access procedure;
• and
• receiving, by the UE from the base station, D2D resource allocation information determined based on the buffer status report.

A user equipment (UE) configured for device-to-device (D2D) communication, the UE comprising:

• a transceiver;
• and
• at least one processor configured to control the transceiver to:
• receive, from a base station, information regarding configuration by the base station of one or more resource pools for D2D communication, the information received via a radio resource control (RRC) message including a system information block for D2D communication in a broadcast control channel (BCCH),
• transmit, to the base station, a message for indication of D2D communication, wherein the message includes information on a frequency on which the UE is interested for the D2D communication and a priority of the D2D communication,
• transmit, to the base station, a request for one or more D2D communication resources for D2D communication and a buffer status report for D2D communication, wherein the UE is configured to transmit D2D messages, and wherein the request for one or multiple D2D communication resources is transmitted using a random access procedure, and
• receive D2D resource allocation information determined based on the buffer status report.

A base station configured for device-to-device (D2D) communication, the base station comprising:

• a transceiver;
• and
• at least one processor configured to:
• configure one or more resource pools for device-to-device D2D communication, control the transceiver to:
• transmit information regarding the configured one or more resource pools for D2D communication to a plurality of user equipments (UEs) including a first UE, the information transmitted via a radio resource control (RRC) message including a system information block for D2D communication in a broadcast control channel (BCCH),
• receive, from the first UE, a message for indication of D2D communication, wherein the message includes information on a frequency on which the first UE is interested for the D2D communication and a priority of the D2D communication,
• receive, from the first UE, a request for one or more D2D communication resources for D2D communication and receive a buffer status report for D2D communication, wherein the first UE is configured to transmit D2D messages, wherein the request for one or more D2D communication resources is received using a random access procedure, and
• determine one or multiple resources for D2D communication for the first UE based on the buffer status report, and
• control the transceiver to transmit D2D resource allocation information to the first UE.