This invention relates to a management device, a communication
system, a vehicle, a method, and a procedure. The management device manages multiple communication devices in a communication
system that communicate according to a predetermined
beacon cycle. The management device includes a processor. The processor obtains transmission
data information (i.e., transmission
data information) from each of the multiple communication devices, including the amount of data to be transmitted and transmission priority related to the data to be transmitted in the next
beacon cycle. Based on the obtained transmission
data information, the processor determines the amount of data allowed to be transmitted by each of the multiple communication devices in the next
beacon cycle and notifies the multiple communication devices of the determined transmission data amount in the current beacon cycle.