Call priority override in a land mobile radio system

• US 5,627,876 A
• Filed: 06/10/1994
• Issued: 05/06/1997
• Est. Priority Date: 06/10/1994
• Status: Expired due to Term

• Current Assignee: Uniden America Corporation (Cornwall Capital Management LP)
• Original Assignee: Uniden America Corporation (Cornwall Capital Management LP)
• Inventors: Moon, Billy G.
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): TROST IV, WILLIAM GEORGE
• Application Number:
  US08/257,809
• Time in Patent Office: 1,061 Days
• Field of Search: 379/60, 379/265, 379/63, 379/59, 379/58, 455/58.1, 455/33.1, 455/54.1, 455/34.1, 455/34.2
• US Class Current: 370/341
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

A land mobile radio communication system has a plurality of cell sites, each of which typically has a plurality of repeaters. The over-the-air radio communications between the cell site repeaters and the mobile radios in the system include both a voice component and a data component. The data component is carried as low-frequency subaudible information. Communication channels are provided between the radio users at each site as well as between users at different sites and between mobile radio users and the public telephone network. Within a cell site, the transmitted and received communications are digitized and passed through serial buses in a time multiplex fashion. The digitized voice is transferred between time slots to provide the required switching function. The system includes operational software to provide direct inward dial telephone number recognition, automatic voice prompts for a user entering a new cell, call priority override, fraud control for radio fleets and a dynamic control channel.

Claims

1. A method for call priority override in a land mobile radio system in which a cell has a group of repeaters, controlled by a controller, and wherein users may place transmission trunked or conversation trunked calls and repeaters are given a system priority for conversation trunked calls, the method comprising the steps of:

receiving at a cell, from a user'"'"'s radio, a call request specifying a number for establishing a conversation trunked call;

examining a data structure, by the controller, using said received number to determine a matching corresponding priority;

assigning said determined corresponding priority to override said predetermined priority for said selected user'"'"'s radio if said matching corresponding priority is determined, and

assigning one of said repeaters to said selected user'"'"'s radio to carry said conversation trunked call if said assigned corresponding priority is at least equal to said system priority for conversation trunked calls.

2. A method for call priority override in a land mobile radio system in which a cell has a group of repeaters, controlled by a controller, and wherein users may place transmission trunked or conversation trunked calls and each user has a predetermined priority, and the group of repeaters are given a system priority for conversation trunked calls, the method comprising the steps of:

receiving at a cell, from a user'"'"'s radio, a call request specifying a number for establishing a conversation trunked call;

examining a data structure, by the controller, using said received number to determine a matching corresponding priority;

assigning said determined corresponding priority to override said predetermined priority for said selected user'"'"'s radio if said matching corresponding priority is determined, and

assigning one of said repeaters to said user'"'"'s radio to carry said conversation trunked call if said assigned corresponding priority is at least equal to, or higher than, said system priority for conversation trunked calls.