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| Number | Title | Issue Date |
| 5276442 | Dynamic address allocation within RF trunking multisite switch A multisite network switch for a series of RF digital trunked radio transceivers and dispatcher consoles. The switch establishes audio communications between different sites and various dispatcher consoles. The multisite switch has a distributed architect... | 01/04/1994 |
| 5245612 | Spread packet communication system A satellite packet communication system comprising a central station and VSAT stations. The central station generates chip-rate clock pulses and transmits a series of data on timeslots of a frame to a satellite transponder, and a plurality of terminal sta... | 09/14/1993 |
| 5239673 | Scheduling methods for efficient frequency reuse in a multi-cell wireless network served by a wired local area network A method includes a first step of receiving a message from a wired network (1) with at least one header station (12). The message is a message type that authorizes a header station or header stations to transmit on a wireless network. A second step of the... | 08/24/1993 |
| 5206881 | Wireless local area network In a wireless local area network in which data packets are spread spectrum encoded, method and apparatus are provided for determining phase values that synchronize noise codes at network stations with received data packets. A synchronizing packet is first... | 04/27/1993 |
| 5175866 | Fail-soft architecture for public trunking system A site architecture for a trunked radio frequency communications system provides better fault tolerance capabilities than are available from architectures including redundant hardware. During normal system operations, a primary site controller performs mo... | 12/29/1992 |
| 5170394 | Host network communication with transparent connection devices A packet switched network has a system for providing an end-to-end connection for a communication or data transfer session between a host processor and a transparent connection device, which may be an unattended device, both utilizing a 3270 protocol. A t... | 12/08/1992 |
| 5161154 | Communication system having a varied communication resource grant channel usage requirement A communication system (100) that varies the channel usage requirements of its communication resource assignment grant signals to accommodate the varying needs of communication units themselves as well as accommodating current loading conditions on an ass... | 11/03/1992 |
| 5157709 | Radio communications system adaptively assigning channels using power levels of idle channels In a mobile radio communications system comprising a control station and base stations, each base station is capable of sensing power levels of signals received on idle channels. In response to a polling signal periodically sent from the control station, ... | 10/20/1992 |
| 5153878 | Radio data communications system with diverse signaling capability Method and apparatus are disclosed for accommodating diverse signalling methods and protocols within a single, unified Radio Data Communications system without interference. In this way, improvements and new products may be integrated within a pre-establi... | 10/06/1992 |
| 5121387 | Link utilization control mechanism for demand assignment satellite communications network A link utilization control mechanism for a demand assignment satellite communication network employs a modified point-to-point communications protocol (X.25) in order to simulate point-to-point communication ports and thereby interface what is effectively... | 06/09/1992 |
| 5103448 | Simultaneous ringing control in the time division duplex telecommunications system A telecommunications sytem comprises a plurality of distributed base stations each operatively coupled to a public switched telecommunications network and being adapted to cooperate with one or more of a plurality of portable cordless telephone units by w... | 04/07/1992 |
| 5070536 | Mobile radio data communication system and method In an exemplary embodiment, a test signal is sent by a base station at a suitable point in a communications protocol. According to the evaluation of the test signal transmission, a relatively high data rate or a lower more conservative data rate is select... | 12/03/1991 |
| 5046066 | Wireless local area network A local area network permits wireless transfer of digitized data among data processing machines in the interior of a building. The network includes a base station which may commonly be associated with shared network resources such as a host computer, prin... | 09/03/1991 |
| 5025486 | Wireless communication system with parallel polling A system which can provide short-range wireless data communication between a base station and a portable low-power module. Each portable module has an identification field by which it can be addressed separately. The identification field (which is 64 bits... | 06/18/1991 |
| 5003534 | Link utilization control mechanism for demand assignment satellite communications network A link utilization control mechanism for a demand assignment satellite communication network employs a modified point-to-point communications protocol (X.25) in order to simulate point-to-point communication ports and thereby interface what is effectively... | 03/26/1991 |
| 4989204 | High throughput communication method and system for a digital mobile station when crossing a zone boundary during a session In a digital radio communications system, a mobile station in the service zone of a first base station transmits a reconnect request packet to a second base station when leaving the service zone of the first and entering the service zone of the second dur... | 01/29/1991 |
| 4945355 | System for cooperatively reassigning duties in a multiple controller environment A radio communication system having the capability of providing acknowledgement messages to incoming messages while compensating for failed components that have the duty of acknowledging messages or redistributing the acknowledgment duties evenly among th... | 07/31/1990 |
| 4940974 | Multiterminal communication system and method In an exemplary communications system a multiplicity of mobile terminals are to share a communications link with a primary processor. The primary processor may transmit a multiterminal polling signal defining a series of successive response time slots whi... | 07/10/1990 |
| 4930118 | Frame-interval fault detection in a demand assignment TDMA communication system In a demand assignment TDMA communication system, a central station transmits a frame sync and a polling signal at periodic intervals to terminal stations to elicit a response therefrom. Each terminal station transmits a test signal in response to recepti... | 05/29/1990 |
| 4928096 | Paging terminal apparatus with message storage and retransmission capability and method therefor Apparatus and method is disclosed for storing and subsequently transmitting later messages for system pagers with acknowledge back capability that nevertheless fail to acknowledge back in the first instance. Addresses are retransmitted for pagers initiall... | 05/22/1990 |
| 4924457 | Concentrator system with polling-response means for detecting failures to stop tariff charges on locally established intraoffice calls In a radio concentrator system, a master station and a terminal station cooperate with each other to establish connections between remote subscriber terminals and a public switched network through radio message channels. An intraoffice call is set up betw... | 05/08/1990 |
| 4910794 | Mobile radio data communication system and method In an exemplary embodiment, a test pattern is sent by a base station at a suitable point in a communications protocol. According to the evaluation of the test pattern transmission, a relatively high data rate or a lower more conservative data rate is sele... | 03/20/1990 |
| 4903262 | Hardware interface and protocol for a mobile radio transceiver A system and method for communicating control signals between a digital mobile transceiver, a digital control head, and a mobile data terminal over a common serial peripheral bus uses a message protocol and architecture which is efficient and yet provides... | 02/20/1990 |
| 4882730 | TDMA communication system having common time slots for system maintenance A deman assignment TDMA communication system includes first and second time division multiplexed (TDM) transmitting channels for establishing a broadcast channel from the central station to the terminal stations and a pair of first and second TDM receivin... | 11/21/1989 |
| 4809268 | Multipoint data communication with a supervisory system for detecting a malfunctioning remote station A random access multipoint data communication system comprises a central station and a plurality of remote stations. A multiple access channel is established from the remote stations to the central station and a broadcast channel is established from the c... | 02/28/1989 |
| 4789983 | Wireless network for wideband indoor communications The present invention relates to a wideband communication network using wireless radio transmissions either on a stand-alone basis or to supplement a hard-wired network. The exemplary network comprises (a) a plurality of transceivers associated with separ... | 12/06/1988 |
| 4672608 | Multiple access communications system A method by which substations in a multiple access communication system, such as a mobile radio system, may access the base station. Access is determined by the base station in accordance with any of a plurality of operating modes during successive messag... | 06/09/1987 |
| 4466001 | Polling system for multiple terminal units A semi-duplex communication system provides high channel efficiency by having the base station transmit a reference signal which each terminal uses as a sync signal. Each unit having data to send to the base responds with a very brief signal such as a bur... | 08/14/1984 |
| 4251865 | Polling system for a duplex communications link Channel efficiency in a communications link between a controller and multiple portable units is increased by polling the active units and a set number of inactive units in a sequence where a "poll" consists of sending the binary coded address of the porta... | 02/17/1981 |
| 4071711 | Telephone subscriber distribution system This invention relates to a multi-point information distribution system useful for telephone service, data connecting systems and other applications which permits a central station to service a plurality of outlying stations, through transmission media su... | 01/31/1978 |
