METHOD OF MAINTAINING QUEUED CALL REQUESTS DURING REPLACEMENT OF CONTROL CHANNEL FREQUENCY
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2002-May-07
A wireless, trunked communication systems, as illustrated in Figure 1, consists of a communication controller, an Operations and Maintenance Center (OMC) or Man Machine Interface (MMI), a num- ber of base stations connected to the communica- tion controller via a Local Area Network (LAN), and a number of mobile subscriber units, such as radios or cellular telephones. Each of the base sta- tions provide a plurality of communication chan- nels. One of the base stations provides a control chan- nel and several traffic channels, while the remaining base stations provide trafhc channels only. Mobile radio system access and control occurs over the con- trol channel. The control channel carries most of the control-related messages in the system includ- ing, but not limited to: origination requests, chan- nel assignments, power control, time alignment, sys- tem configuration, and system resource availability. The communication controller will respond to call requests received over the control channel with either a channel assigned message assigning the requesting subscriber unit a channel for communication, or with a request queued message to the requesting mobile subscriber, queueing the request pending resource availability.