Signalling method for establishing trunked communication

摘要: A trunked communication signalling method is provided by a unifying protocol in which subscribers request channels using only their individual IDs encoded into single ISWs. The central decodes the call request, extracts requesting subscriber's ID, cross referenced to determine talk-group affiliation(s). If affiliation(s) are not known, commands subscriber transmit its affiliation dual ISW signalling. In another aspect of present invention, each automatically informs change affiliation, thereby providing continual updates. this way, many thousand afforded access system, and control channel traffic congestion minimized.