Unlicensed frequency band with licensed frequency band timing

A transmitting device comprising:

• a transmitter;
• a receiver;
• and
• a controller, wherein
• the transmitter is configured to transmit first signals within a licensed frequency band using a timing structure comprising frames, subframes and timeslots,
• the transmitter is configured to transmit second signals within an unlicensed frequency band using the timing structure,
• the receiver is configured to monitor the unlicensed frequency band,
• the controller is configured to determine, at least partially based on the monitoring, whether the unlicensed frequency band is in use, and
• the transmitter is configured to transmit the second signals within the unlicensed frequency band only if the unlicensed frequency band is determined to not be in use.

A control apparatus configured to control a transmitting device, configured to:

• transmit first signals within a licensed frequency band using a timing structure comprising frames, subframes and timeslots,
• transmit second signals within an unlicensed frequency band using the timing structure,
• monitor the unlicensed frequency band,
• determine, at least partially based on the monitoring, whether the unlicensed frequency band is in use, and
• transmit the second signals within the unlicensed frequency band only if the unlicensed frequency band is determined to not be in use.