... above. Because of the restriction of the radio medium (e.g., ra-dio range), both standards must contain functions for the management andmaintenance of the radio network that far exceed the normal ... itself. If the radio channel is Idlefor a longer period of time, the HCS provider notifies the MAC sublayeraccordingly through HC Free Indication. The CAC sublayer thereby indicatesthat the ... fol-lowing access cycle on the radio channel.If the MAC sublayer has HCSDUs available for transmission, it must, assoon as it receives the HC Unitdata Indication message, immediately createan HC Unitdata...