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| Number | Title | Issue Date |
| 5553315 | Method of maintaining access authorization using a bulletin board communication resource A bulletin board coordinates the service authorization for other communication systems. Service authorizations are periodically updated, with authorized communication units returning to the bulletin board at pre-scheduled times to receive the updates that... | 09/03/1996 |
| 5459761 | Intelligent repeater for trunked communications An intelligent repeater (101) is used to control trunked communications at a trunked communication site in a trunked communications system. The intelligent repeator (101) transceives and signal processes radio frequency signals. The intelligent repeater (... | 10/17/1995 |
| 5420574 | Channel allocation mechanism A channel allocation mechanism especially useful in a trunked communication system that can accommodate both voice and data signals, and that operates in true trunked manner to efficiently utilize spectral resources.... | 05/30/1995 |
| 5410632 | Variable hangover time in a voice activity detector Variable hangover time is provided for a speech coder (105). Voice activity within a speech message is detected (209) using a voice activity detector (VAD) (107), and a signal-to-noise ratio is calculated. A variable hangover time is calculated (215) and ... | 04/25/1995 |
| 5404403 | Key management in encryption systems A key management system for encryption keys removes the effect of secure communications loss during a rekey period in a secure communications system. Use of key indexes to partition encryption keys into usable subgroups such that during a rekey period, co... | 04/04/1995 |
| 5319796 | Communication system that avoids co-channel interference Co-channel user (129) interference on trunked radio communication systems cannot be compensated for in the same way as conventional radio systems because the communication unit does not know what frequency it will be assigned to until it begins transmitti... | 06/07/1994 |
| 5293644 | Secondary ID usage in a subfleet call A communications system provides subfleet calls for both voice and data communications using a secondary identification (301, 303, 305, 307, 309) incorporating a plurality of subfleets in a hierarchical arrangement. A message including the secondary ident... | 03/08/1994 |
| 5293639 | Reduction of power consumption in a portable communication unit Power consumption in a portable communication unit (101) is reduced by first transmitting at a first time, a message (701) at a first transmit power level to a repeater (103) on a first communication channel. At a second time the message (701) is repeated... | 03/08/1994 |
| 5287387 | Low splatter peak-to-average signal reduction In order to maintain low-splatter in a peak-to-average reduction for a linear communication system, a method of windowed-clipping is used. When a sample of input signal is determined to be above a predetermined threshold, a signal peak is found and an att... | 02/15/1994 |
| 5272724 | Wideband signal synchronization In order to synchronize wideband signals in time while reducing the necessary amount of processing, a number of narrowband signals (203, 205, 207, and 209) are modulated (503) on their own frequency sub-carriers, such that the summation of these modulated... | 12/21/1993 |
| 5263177 | Modified simulcast communication system In simulcast systems, overlapping coverage areas (111, 113, 115, and 117) of base sites (101, 103, 105, and 107) result in distortion of the received signal to any communication unit (121 and 125) within the overlapping area. This distortion occurs becaus... | 11/16/1993 |
| 5222248 | Call hand-off with user selectable site switching In a trunked communication system with at least two communication sites, a call hand-off mid-call may occur when a mobile radio (109) moves from the coverage area of one site to the coverage area of another site. This second site may not have any communic... | 06/22/1993 |
| 5164986 | Formation of rekey messages in a communication system Formation and sending of rekeying messages (305, 415, 515, and 605) in an encrypted communication system with over-the-channel rekeying of communication units is performed by a KMC, key management controller (101). The KMC (101) forms messages to provide ... | 11/17/1992 |
| 5134652 | Communication console station with priority queuing A communication console station links a plurality of communication resources (101, 103, and 105) for use by an operator. Incoming calls are placed in an incoming-call queue (207), calls on hold are placed in a holding queue (209), and all available commun... | 07/28/1992 |
