This document discloses a solution for carrying out radio resource reservation in a framed wireless network. A network node is synchronized to a frame structure of the wireless network, wherein the frame structure comprises a continuous flow of consecutive frames, wherein at least one frame comprises a downlink part and an uplink part, and wherein lengths of the downlink part and the uplink part in each frame are adjustable. A radio resource for use in data transmission between two network nodes is reserved through a radio resource reservation request-response procedure between the network nodes.