Abstract: A method for automatically revising (405) a scan list (201-203) in a wireless communication unit (103-106) employs the provision of a scan list that includes talk group identifiers (202) and reception-priority levels (203) associated the talk groups (202). A wireless message (114) that includes a first talk group identifier (116) and a corresponding reception-priority level (117) instructs the receiving communication untis to revise their scan lists to include the first talk group identifier (116) and the corresponding reception-priority level (117).

Abstract: A method is employed by a central controller of a radio communications system, which method provides for sustaining a predetermined level of communication service. The system includes a plurality of voice channels which are allocated among a plurality of subscribers (108-112) using a first control channel (102). In a preferred embodiment, at least one of the voice channels (104, 106) is also control-capable. The method includes evaluating (502) a current loading condition, and comparing (504) this loading condition with an upper loading threshold. Where appropriate, the controller assigns (506) one of the control-capable voice channels as a temporary control channel.