TIME-DIVISION DUPLEXING

A technique, including: controlling a radio transceiver to make and receive transmissions according to a radio frame structure that includes consecutive time frames of a predefined duration, wherein each time frame includes a plurality of consecutive sub-frames of a predefined duration, and each sub-frame includes a plurality of sets of time resources, and wherein the plurality of sets of time resources of a sub-frame includes: a first set useable for transmissions in a first direction; a second set useable for transmissions in a second, opposite direction; and a third set that is switchable between transmissions in the first direction and transmissions in the second direction, independently of the first and second sets of time resources in the same sub-frame and independently of other sub-frames in the same radio frame.