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| Number | Title | Issue Date |
| 5383221 | Mobile station unit and channel switching method In a mobile radio system including at least one mobile station unit and a plurality of base station units, the mobile station unit communicates with a base station through time-division multiplexed control and communication channels. The mobile station un... | 01/17/1995 |
| 5363376 | Method and apparatus for synchronizing timing among radio ports in wireless communications systems In a TDM/TDMA digital radio communications system, time synchronization between fixed ports is achieved by adjusting the timing of a first port in response to the average timing difference between the timing of that first port and the timing measured by t... | 11/08/1994 |
| 5363369 | System for inter packet community communication A system for delivering packetized data in a network comprising a plurality of packet switch communities, wherein each of the packet switch communities has a plurality of endpoints connected to a common packet switch and having a unique address, and where... | 11/08/1994 |
| 5361395 | Gain control circuit A gain control circuit in which a switch is provided in series with a capacitor in a time constant circuit so that, under control of a controller, the switch is closed in its own signal reception and opened in an idle time other than the signal reception ... | 11/01/1994 |
| 5355367 | One cell re-use pattern for communication system sites Within a communication system having a plurality of communication system sites, each communication system site has a one cell re-use pattern of a limited number of communication resources. Communication units within the communication system utilize a redu... | 10/11/1994 |
| 5327576 | Handoff of a mobile station between half rate and full rate channels In a cellular mobile telephone system of the type having TDMA channels, a plurality of mobile station operate at either a full rate or a half rate. If the mobile stations are operating on the periphery of a cell they are assigned to full rate channels. If... | 07/05/1994 |
| 5327574 | Mobile communication system A mobile communication system comprises a switching station, base stations to constitute respective zones, and mobile stations moving in a service zone formed by the communication zones. Plural base stations exist in one communication zone, and one specif... | 07/05/1994 |
| 5319795 | Cellular mobile communications system using frequencies commonly shared by neighboring cells for handoff operations In a cellular mobile communication system, each base station is allocated common frequencies shared with other base stations in addition to unique frequencies. One of the unique frequencies is assigned by a base station to a mobile terminal in response to... | 06/07/1994 |
| 5317623 | Method of handover and route diversity in mobile radio communication A method of handover and route diversity in a mobile radio communication which is less time consuming and capable of improving the frequency spectrum utilization efficiency and securing the high quality of service regardless of the moving speed of the mob... | 05/31/1994 |
| 5311571 | Method and apparatus for performing inbound calling in a wireless communication system having fixed communication units coupled to a telephone system by a telephone line shared in common A wireless communication system includes a portable communication unit (PCU) (120) and a plurality of fixed communication units (FCUs) (102) covering a plurality of radio coverage areas (108, 110, 112). The FCUs are coupled to a telephone system (114) by ... | 05/10/1994 |
| 5309503 | Dynamic channel assignment in a communication system A communication system dynamically assigns channels to a subscriber unit so as to, inter alia, mitigate the effects of co-channel interference in the system. The communication system has a plurality of base-stations receiving the transmission of a subscri... | 05/03/1994 |
| 5303289 | Communication transfer in a cellular radiotelephone system During the handoff of a mobile unit (225) between a serving or source base-site (200) and a selected target base-site, (205 or 210) the target base-site (205 or 210) is directed to tune to and monitor the mobile unit's in progress call on a serving base-s... | 04/12/1994 |
| 5303287 | Integrated personal/cellular communications system architecture An integrated PCN/DCN system architecture has a switching center, coupled to a public switched telephone network (PSTN), which selectively transfers signals between the PSTN and a digital cellular network (DCN) or a personal communications network (PCN) w... | 04/12/1994 |
| 5301356 | Prioritization between handoff and new call requests in a cellular communications system A method and system for ensuring that handoff requests take priority over new cell requests to engage voice channels assigned to a particular target cell are provided. A certain number of channels are reserved for handoff requests. However, if no channels... | 04/05/1994 |
| 5293380 | Frame synchronization system among multiple radio base stations for TDMA digital mobile communications system A TDMA digital mobile communications system prevents TDMA frame synchronization from being asynchronous among radio base stations when a communication held by a mobile station is handed over from one service area to another. A control station sends a rese... | 03/08/1994 |
| 5293423 | Synchronizing method in a mobile radio system A synchronizing method in a mobile radio system which operates with Time Division Multiple Access (TDMA) but which lacks global time reference for all base stations and mobiles in the system. The inventive method is intended for ciphered transmission of d... | 03/08/1994 |
| 5291544 | Method of transferring, between two switching exchanges for mobile services, the handling of an active connection with a mobile terminal When a mobile telephone being served by a cellular mobile radio domain served by a first switching exchange equipped for mobile radio communication through base stations for the respective calls moves over to another mobile radio domain similarly served b... | 03/01/1994 |
| 5289525 | Handover method for radiotelephone networks A handover method for a cellular radiotelephone networks in which, a call having been set up with a mobile via a first transceiver of a first cell, the handover consists in handing over to a second transceiver of a second cell and in switching in the mobi... | 02/22/1994 |
| 5287544 | Method of channel assignment by matching channel interference with channel link loss A method is offered of achieving a desired C/I ratio within a cellular system, at reduced transmitter power levels, by measuring a signal loss on a downlink between a base site transmitter (31) and mobile receiver (20) and calculating an uplink signal mag... | 02/15/1994 |
| 5276907 | Method and apparatus for dynamic distribution of a communication channel load in a cellular radio communication system A method and apparatus is provided for dynamic distribution of a communication channel load in a sectorized cellular radio communication system. The channel load is distributed by narrowing a first sector antenna beamwidth of an overloaded sector of a cel... | 01/04/1994 |
| 5276730 | Access method for distributed dynamic channel allocation in microcells A method of providing local autonomous control of channel allocation of a cellular telecommunications network. In one prior art method, which can be identified as the timid method, a channel is selected for use by an incoming user if it is not being used ... | 01/04/1994 |
| 5257401 | Method of maintaining an established connection in a mobile radio system comprising both analog and digital radio channels The invention relates to a method in a mobile radio system having both digital and analog radio channels. An object of the invention is that a connection established on a digital radio channel often shall be possible to maintain even when the time dispers... | 10/26/1993 |
| 5257402 | Method for effecting handoff in a multi-site communication system A method of effecting handoff of a communicating communication unit from a first communication resource to a second communication resource. After determining that a handoff from the first communication resource to the second communication resource should ... | 10/26/1993 |
| 5243598 | Microcell system in digital cellular A cellular telephone system is described of the type wherein a plurality of contiguous cells, each having a different assigned set of transmission frequency channels, are arranged with handoff control for maintaining continuous communication with mobile t... | 09/07/1993 |
| 5243653 | Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system throughout a hand-off In a wireless communication system comprising a plurality of fixed communication units (FCUs) (102) and portable communication units (PCUs) (120), each comprising an encryption synchronization counter (ESC) (314, 414), the PCU and FCU having a digital tra... | 09/07/1993 |
| 5241685 | Load sharing control for a mobile cellular radio system In a mobile cellular radio system, load balancing is achieved by moving dynamically the borders between any two cells such that an overloaded cell becomes smaller and the neighboring cell larger. This is achieved by lowering the entering signal strength t... | 08/31/1993 |
| 5241686 | Regulation of traffic load of fixed stations in a cellular radio communication network The process aims to constantly optimize the distribution of the radio-electric load on a radio communication cellular network between fixed relays. This is equivalent to increasing or reducing the surface of network cell when the traffic in the cell decre... | 08/31/1993 |
| 5239682 | Inter-cell call hand-over in radio communication systems with dynamic channel allocation The call hand-over technique of this invention is characterized by the use of channel information from both the target base station and subscriber terminal in determining which radio traffic channel will be used to hand over a call in progress from a serv... | 08/24/1993 |
| 5239676 | Intra-cell call hand-over in radio communication systems with dynamic channel allocation The intra-cell call hand-over technique of this invention is characterized by the use of channel information from both base station and subscriber terminal in determining a standby radio traffic channel upon which to hand over a call. Communication betwee... | 08/24/1993 |
| 5239675 | Reduced noise interference during handoff A radiotelephone system reduces noise interference during handoff by muting the audio path of a receiver employed in a target base-station (135). After receive a handoff request message, a target base-station (135) mutes the target audio path and determin... | 08/24/1993 |
| 5231632 | Radio communication equipment for a mobile station and traffic channel hand-off method using the same In radio communication equipment for use in a mobile station, provision is made for selectively applying either one of the oscillation outputs of first and second local oscillators to a transmitting part and a receiving part by first and second RF switche... | 07/27/1993 |
| 5218715 | Multi-donor booster operation and system A system and method for handing back a movable transceiver to a different cell site from the original cell site includes circuitry for sensing signals from the movable transceiver which are transmitted on a modified frequency as well as circuitry for tran... | 06/08/1993 |
| 5210787 | Subscriber interrogation point In a cellular radio communications network a plurality of mobile switching centers have data access to a subscriber interrogation point which maintains a database identifying the home exchange of a plurality of mobile stations, the home exchanges of which... | 05/11/1993 |
| 5195090 | Wireless access telephone-to-telephone network interface architecture A wireless-access communications system, such as a CDMA cellular radio-telephone system (FIG. 2), comprises a packet-switched communications network (202, 207, 201) that interconnects cells (base stations; 202) with each other and with the public telephon... | 03/16/1993 |
| 5193109 | Zoned microcell with sector scanning for cellular telephone system A zoned microcell system with sector scanning for cellular telephone systems has a plurality of contiguous cells, each having a different assigned set of transmission frequency channels, arranged with handoff means for maintaining continuous communication... | 03/09/1993 |
| 5187470 | Paging system with local channel lists A page receiver is provided a list of alternative paging channels to which it can tune if the paging channel presently being received becomes unreliable. This list, and other lists used by paging receivers in the other geographical areas, are disseminated... | 02/16/1993 |
| 5182753 | Method of transmitting signaling messages in a mobile radio communication system In a mobile radio communications system, critical signaling messages, e.g., handoff messages, transmitted on a fast associated control channel and/or a slow associated control channel belonging to a digital traffic channel, are more heavily data protected... | 01/26/1993 |
| 5175758 | Cellular telephone system integrated with paging network A telephone system with which a connection between two subscribers can be established, at least one of them being a mobile subscriber. The system includes a paging network composed of one or several extensive paging ranges, each of them having a paging tr... | 12/29/1992 |
| 5170485 | Hand-off algorithm for elongated radiotelephone cells The hand-off process of the present invention minimizes the number of hand-offs in radiotelephone system using smaller, elongated cells that may provide radiotelephone coverage in an urban environment along streets. While in the idle mode, the process of ... | 12/08/1992 |
| 5161249 | Sectored voice channels with rear lobe protection An improved method of initiating handoffs between sectors so as to reduce sectored voice channel interference is disclosed. The sectors that are adjacent and to the rear of the sector that is serving the mobile unit are scanned for signal quality. A hando... | 11/03/1992 |
