Method and equipment for establishing device to device connection through dedicated discovery signal

A user equipment, comprising a calculating device, and a storage device for storing program code that when executed by the calculating device causes the calculating device to enable:

• a sending unit configured to send a dedicated discovery signal;
• a receiving unit configured to receive a response message, wherein the response message is sent by a second user equipment that has detected the dedicated discovery signal;
• a connection establishment unit configured to establish a device-to-device connection with the second user equipment after receiving the response message;
• and
• a communication unit configured to communicate with a network side through the device-to-device connection and a cellular communication link between the second user equipment and the network side;
• wherein the dedicated discovery signal is a signal occupying one or more than one resource element, and has specific sending time and/or frequency location, and wherein the dedicated discovery signal is a data block carrying a synchronization signal or preamble, and the data block has an appointed modulation and coding scheme.

A wireless communication method, comprising:

• a second user equipment detecting a dedicated discovery signal sent by a first user equipment;
• the second user equipment sending a response message of the dedicated discovery signal to the first user equipment;
• the second user equipment establishing a device-to-device connection with the first user equipment;
• and
• the second user equipment relaying communication data from the first user equipment to a network side through the device-to-device connection and a cellular communication link between the second user equipment and the network side;
• wherein the dedicated discovery signal is a signal occupying one or more than one resource element, and has a specific sending time and/or frequency location, wherein the dedicated discovery signal is a data block carrying a synchronization signal or a preamble, and the data block has an appointed modulation and coding scheme.