According to a first aspect of embodiments herein, the object is achieved by a method performed by a first communication device. The method is for sending one or more control signals to a second communication device. The first communication device and the second communication device operate in a wireless communications network. The first communication device determines, during a first period, that a transmission medium is available for sending the one or more control signals to the second communication device. The first communication device then sends, to the second communication device, the one or more control signals along with a discovery signal, via the transmission medium. The discovery signal and the one or more control signals are sent without data after the first period. The first period is shorter than a second period for determining that the transmission medium is available for sending the data.

According to a second aspect of embodiments herein, the object is achieved by the first communication device configured to send one or more control signals to the second communication device. The first communication device and the second communication device are configured to operate in the wireless communications network. The first communication device is configured to determine, during the first period, that the transmission medium is available for sending the one or more control signals to the second communication device. The first communication device is further configured to send, to the second communication device, the one or more control signals along with the discovery signal, via the transmission medium. The discovery signal and the one or more control signals are configured to be sent without data after the first period. The first period is shorter than the second period configured for determining that the transmission medium is available for sending the data.