one time or may activate a plurality of user equipments at one time in a case that a plurality of user equipments are activated at one time the plurality of user equipments correspond to different bit positions from each other in the low layer signaling such as the pdcch signaling according to the embodiment of the invention the number of times that the sounding reference signal being transmitted when the user equipment is activated is preset which may be one time or may be a plurality of times according to the embodiment of the invention the user equipment automatically stops transmitting the sounding reference signal when the number of times that the sounding reference signal being transmitted when the user equipment is activated reaches a preset number that is deactivation of the sounding reference signal needs no additional signaling according to the embodiment of the invention when the user equipment is activated to transmit the sounding reference signal the user equipment may employ various resources to transmit the sounding reference signal as shown in fig3 and 4 fig3 is a schematic diagram illustrating a subframe for transmitting an uplink sounding reference signal according to an embodiment of the invention and fig4 is a schematic diagram illustrating an another subframe for transmitting an uplink sounding reference signal according to the embodiment of the invention in fig3 the user equipment transmits the sounding reference signal by employing at least one of the last symbol in a subframe for transmitting the sounding reference signal periodically in the prior art the third symbol in the subframe for transmitting a demodulation reference signal in the prior art and the tenth symbol in the subframe for transmitting the demodulation reference signal in the prior art alternatively in fig4 the user equipment transmits the sounding.