Telecommunications apparatuses and methods

Circuitry for a base station for use in a mobile telecommunications system, the system comprising the base station and a terminal operable to communicate with the base station via a wireless interface, the wireless interface having a first frequency band and a second frequency band, wherein the first frequency band is different from the second frequency band and wherein the circuitry comprises a controller and a transceiver configured to operate together to:

• determine that, at a time t, an acknowledgment signal is to be transmitted by the base station to the terminal in the second frequency band;
• and
• transmit, upon determination that at the time t a downlink signal is to be transmitted to the terminal in the first frequency band, a multiplexed signal by multiplexing the acknowledgment signal with the downlink signal and transmitting the multiplexed signal in the first frequency band.

A method of operating a base station in a mobile telecommunications system, the system comprising the base station and a terminal operable to communicate with the base station via a wireless interface, the wireless interface having a first frequency band and a second frequency band, wherein the first frequency band is different from the second frequency band and the method comprises:

• determining that, at a time t, an acknowledgment signal is to be transmitted by the base station to the terminal in the second frequency band;
• and
• transmitting, upon determination that at the time t a downlink signal is to be transmitted to the terminal in the first frequency band, a multiplexed signal by multiplexing the acknowledgment signal with the downlink signal and transmitting the multiplexed signal in the first frequency band.