A method of transmitting data in a network, said network comprising a first transceiving station and a further transceiving station, said method comprising transmitting data in a sequence of frames, and for each frame of the sequence: selecting (S408, S416) a frame structure of a frame from a predetermined plurality of frame structures, wherein each of the plurality of frame structures comprises a synchronisation portion including one or more synchronisation slots for transmitting synchronisation data and one or more further portions (206, 208, 210) including one or more further slots for transferring further data between the first transceiving station and the further transceiving station, the further data being different from said synchronisation data, the number of said synchronisation slots and/or said further slots varying between the predetermined plurality of frame structures; and transmitting data from said first transceiving station to said further transceiving station according to the selected frame structure, characterised in that said method comprises determining an amount of said further data to be transferred between the first transceiving station and the further transceiving station within said one or more further portions of said frame; and said selecting (S408, S416) comprises: selecting a number of said further slots, based on the determined amount of said further data, whereby to select a frame structure from the predetermined plurality of frame structures, such that the frame structure and number of synchronisation slots vary dynamically between different frames of the sequence in dependence on the determined amount of further data for each respective frame. selecting (S408, S416) a frame structure of a frame from a predetermined plurality of frame structures, wherein each of the plurality of frame structures comprises a synchronisation portion including one or more synchronisation slots for transmitting synchronisation data and one or more further portions (206, 208, 210) including one or more further slots for transferring further data between the first transceiving station and the further transceiving station, the further data being different from said synchronisation data, the number of said synchronisation slots and/or said further slots varying between the predetermined plurality of frame structures; and transmitting data from said first transceiving station to said further transceiving station according to the selected frame structure, characterised in that said method comprises determining an amount of said further data to be transferred between the first transceiving station and the further transceiving station within said one or more further portions of said frame; and said selecting (S408, S416) comprises: selecting a number of said further slots, based on the determined amount of said further data, whereby to select a frame structure from the predetermined plurality of frame structures, such that the frame structure and number of synchronisation slots vary dynamically between different frames of the sequence in dependence on the determined amount of further data for each respective frame. selecting a number of said further slots, based on the determined amount of said further data, whereby to select a frame structure from the predetermined plurality of frame structures, such that the frame structure and number of synchronisation slots vary dynamically between different frames of the sequence in dependence on the determined amount of further data for each respective frame.