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| Number | Title | Issue Date |
| 8098639 | System and method for managing communication channel assignments for different types of communication units in a communication system System and method for efficiently managing communication channel assignments within talkgroups having dual mode communication units capable of operating on a first communication channel type and on a second communication channel type, and single mode communication u... | 01/17/2012 |
| 7986692 | System and method for transmitting call information in a communication system with long link delays A system and method for transmitting call information in a communication system having sites with long link delays. Upon a call being initiated within the communication system, a zone controller determines the participating sites that are to be involved in the call ... | 07/26/2011 |
| 7983681 | System and method for enhancing interoperability between mobile communication system components using different audio encoding formats A system and method for improving the interoperability of communication system components using multiple audio encoding formats within a single talkgroup is provided. The system includes at least two base site repeaters, each of which may be configured to receive an... | 07/19/2011 |
| 7970426 | Method of assigning provisional identification to a subscriber unit and group The present disclosure provides an efficient and effective method for allocating provisional PUIDs and PGIDs to subscriber units and groups during a failure, such that when the communication system recovers, there is a decrease in or elimination of the number of dro... | 06/28/2011 |
| 6999465 | Methods for reliably sending IP multicast packets to multiple endpoints of a local area network Methods are disclosed for determining a link Op from among a plurality of host devices on a LAN, for exchanging control messages between a communication server and one or more sites having a link Op and a listening Op and for the link Op and/or listening Op to detec... | 02/14/2006 |
| 6920114 | Method of call control for console sites monitoring critical talkgroups in a packet-based communication system A method of call control in a packet-based communication system having consoles, distributed among one or more console sites, that are adapted to monitor talkgroup calls. The console sites are served by console site links having a limited available bandwidth. Upon r... | 07/19/2005 |
| 6785254 | Wireless communication system incorporating multicast addressing and method for use A Packet Network for use in association with a wireless communication system employs packet distribution and call set-up methods optimized to select from a plurality of network routing devices, a single node (i.e., Rendezvous Point (VP) or.multicast core) as a funct... | 08/31/2004 |
| 6647020 | Methods for implementing a talkgroup call in a multicast IP network Systems and methods for implementing dispatch calls using IP multicasting protocols are disclosed. The methods include utilizing a payload multicast group address for distributing payload, and utilizing a control multicast group address for distributing c... | 11/11/2003 |
| 6298058 | Methods for implementing a talkgroup call with competing sources in a multicast IP network Methods for implementing talkgroup calls in an IP multicast network among competing sources, including console dispatch takeover of an active call from a subscriber, subscriber unit attempted takeover of an active call from a console, and operation of com... | 10/02/2001 |
| 6157843 | Method for pre-establishing communications in a wireless communication network without the use of a multicast server Network access delays are minimized by using affiliation messages to pre-establish communications in a wireless communication network (100). A controller (102), upon receiving an affiliation message from a first site (104), establishes connections between... | 12/05/2000 |
| 5450405 | Method for establishing and maintaining communication processing information for a group call When a group communication group call is initiated in a multi-site communication system, the communication processing information for that particular communication group call must be established. The communication processing information is formatted by a ... | 09/12/1995 |
| 5381403 | Method for establishing and maintaining system configuration information In a communication system network that includes a central controller that is operably coupled to a processing multiplexer switch, system configuration information may be transferred between the central controller and the processing multiplexer by establis... | 01/10/1995 |
| 5341498 | Database management system having first and second databases for automatically modifying storage structure of second database when storage structure of first database is modified An operator MUX interface (OMI) (102) includes a data base manager (203) that manages at least two data bases. The first comprises a substantially non-temporary data base, and the second comprises a substantially temporary data base. The latter includes i... | 08/23/1994 |
| 5287542 | Method to expand an audience in a communication system network A central controller of a communication system network may more efficiently expand an audience of a communication in the following manner. When a communication unit of a first communication group within a first communication system transmits a request for... | 02/15/1994 |
| 5274630 | Communication system network that includes a method for maintaining a system data database In a communication system network that includes a processing multiplexer and a plurality of communication systems, wherein each of the communication systems includes a plurality of signal sources, a plurality of signal destinations, and a processing inter... | 12/28/1993 |
| 5233605 | Method for assuring fidelity of a summing process In a digital summing process that sums non-linear digital signals by converting them to linear signals, computing their two's complement, summing the two's complements together and converting the resultant into a non-linear resultant, the fidelity of the ... | 08/03/1993 |
| 5228038 | Communication system network that includes a BIM status update method In a communication system network that includes a processing multiplexer, a plurality of communication units, and a plurality of communication systems, each of the plurality of communication systems includes a base interface modules for interfacing the co... | 07/13/1993 |
| 5224094 | Communication system network that includes full duplex conference calling During an existing communication between a first communication unit and at least a second communication unit, any communication unit in the existing communication may add another communication unit to the communication. This may be accomplished by initiat... | 06/29/1993 |
| 5210746 | Communication system network having communication system fallback operation In a communication system network that comprises a plurality of communication systems and a processing multiplexer, each of the plurality of communication systems is equipped with fallback operation circuitry. The fallback operation circuitry enables a co... | 05/11/1993 |
| 5204862 | TDM slot muting method and apparatus In a communications system network that comprises a plurality of communication systems and a processing multiplexer, a method and apparatus for selectively muting particular signal sources of a communication system is disclosed. In each communication syst... | 04/20/1993 |
| 5093829 | Communication system network The present invention discloses a communication system network that comprises a plurality of communication systems and a processing multiplexer. The communication systems, which may be either conventional communication systems and/or trunked communication... | 03/03/1992 |
| 5070499 | Communication system interface module for use within a communication system network In a communication system network that comprises a plurality of communication systems and a processing multiplexer, the processing multiplexer comprises a processing module, a buffer module, a multiplexer module, and a buffer address module. The buffer mo... | 12/03/1991 |
| 4961070 | Radio console with CRT display A radio console having a CRT display that allows channel control windows (CCWs) to be moved about a work area or from a summary list to a work area and back again. The CCWs may be of various sizes, and the display provides helpful indications of suitable ... | 10/02/1990 |
| 4570261 | Distributed fault isolation and recovery system and method There is disclosed a system and a method for isolating faults and recovering a distributed system of the type including a plurality of modules to optimized operation. At least some of the modules are active fault recovery modules and include fault detecti... | 02/11/1986 |
| 4514703 | Automatic level control system An automatic level control system is described for use with a voice processor which generates an AGC control signal to vary the gain applied to an audio input signal. The system includes a dynamically adjusting peak detector for detecting noise peaks and ... | 04/30/1985 |
