A communication system for communicating on a network that includes communication
devices performs communications in a connected mode or a non-connected mode. For
at least one of the communication devices, to effect a transmission in the connected
mode, the system performs an information operation during which an item of information
representing a passband necessary for the transmission in the connected mode is
broadcast on the network. The system performs a passband allocation operation to
allocate the passband for connected-mode transmissions, based on the item of information.
A second allocation operation is performed to allocate, for non-connected-mode
transmissions, all or part of the passband not allocated for the connected-mode
transmissions. The system adjusts the allocated passband to avoid congestion on
the network.
