Signal Transmission Method, Signal Transmission Control Method, User Equipment, and Base Station

A signal transmission control method, comprising:

• sending, by a base station, sounding reference signal (SRS) configuration information to a user equipment (UE) using radio resource control (RRC) signaling or physical downlink control signaling (DCI) to enable the UE to send an SRS based on the SRS configuration information;
• and
• receiving, by the base station, the SRS based on the SRS configuration information from the UE.

A user equipment (UE), comprising:

• a processor, configured to perform channel detection;
• and
• a transmitter coupled to the processor and configured to send uplink data when a result of the channel detection comprises that a channel is available, the uplink data comprising one or more subframes, at least one subframe comprising a sounding reference signal (SRS), and the SRS being located at a start location of the at least one subframe.

-18. (canceled)