A device for medium access control in a node of a wireless communication network with time-shared medium includes a slot allocation module configured to allocate a timeslot for transmission from the node to a destination node over the time-shared medium; a validation module configured to validate a data packet before transmission to the destination node based on a latency requirement for the data packet, and an expected latency for the data packet based on the position in time of the timeslot, resulting in an approved data packet or a disapproved data packet; a scheduling module configured to schedule an approved data packet in the timeslot for transmission to the destination node.