The invention relates to a device (10) for a cellular communications network (1000), wherein said device (10) includes at least a processor (12), a memory (14) and a transceiver (16) and is configurable to: determine (300) a parameter (P) which characterizes a relative velocity (v_rel) of said device (10) with respect to a base station (110) of said cellular communications network (1000), and to modify (302) a timing of at least one uplink transmission (ul) from said device (10) to said base station (110) depending on said parameter (P).