Signal transmission method and apparatus

A signal transmission method, comprising:

• receiving, by using a first uplink carrier, a first signal sent by an access node, and parsing the first signal according to at least one protocol layer of a fourth protocol stack and a third protocol stack;
• or
• generating a third signal according to the at least one protocol layer of the fourth protocol stack and the third protocol stack, and sending the third signal to the access node by using a first downlink carrier;
• wherein
• the fourth protocol stack is used to implement communication between a base station and a user equipment on a user equipment side, the third protocol stack is used to implement communication between devices, and the third protocol stack is connected to the at least one protocol layer of the fourth protocol stack.

A signal transmission apparatus, comprising:

• a processor, configured to:
• according to at least one protocol layer of a first protocol stack for implementing communication between a base station and a user equipment on a base station side and a second protocol stack for implementing communication between devices, generate a first signal or parse a third signal received by a receiving unit;
• a sending unit, configured to send, by using a first uplink carrier, the first signal generated by the processor to a receive end;
• or
• a receiving unit, configured to receive, by using a first downlink carrier, the third signal sent by the receive end;
• wherein
• the second protocol stack is connected to the at least one protocol layer of the first protocol stack.

A signal transmission apparatus, comprising:

• a processor, configured to:
• according to at least one protocol layer of a fourth protocol stack for implementing communication between a base station and a user equipment on a user equipment side and a third protocol stack for implementing communication between devices, parse a first signal received by a receiving unit or generate a third signal;
• a receiving unit, configured to receive, by using a first uplink carrier, the first signal sent by an access node;
• or
• a sending unit, configured to send, by using a first downlink carrier, the third signal generated by the processor to the access node;
• wherein
• the third protocol stack is connected to the at least one protocol layer of the fourth protocol stack.