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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 5862483 | Mobility management method for delivering calls in a microcellular network In a method of providing cellular telephone service to a mobile telephone located in an off-load cellular telephone system adjacent to a main cellular telephone system, the mobile telephone is registered with the off-load cellular telephone system upon th... | 01/19/1999 |
| 5857154 | Multiprotocol mobile telephone network having high tier and low tier systems A multiprotocol radio communications network that includes a first plurality of stationary transceivers for handling low-tier traffic and a second plurality of stationary transceivers for handling high-tier traffic. The stationary transceivers communicate... | 01/05/1999 |
| 5850609 | Method for locating a cellular radiocommunication mobile station, and equipment for implementing the method At least one fixed beacon is associated with a user of a mobile station and emits, with a range (r) substantially smaller than the characteristic dimension (R) of a cell, a radio signal specific to said user. When the mobile station detects the radio sign... | 12/15/1998 |
| 5842129 | Portable radio telephone equipment used for CMTS/MCS in common A portable radio telephone equipment in which both the frequency and equipment can be used in common to CMTS and MCS so that the efficiency for use both for the frequency and equipment can be improved. This equipment monitors the control channel number of... | 11/24/1998 |
| 5839070 | System and method for hyperband cell interoperability in a cellular telecommunications network A system for providing seamless interoperability for a multi-hyperband capable mobile station roaming between cells within a cellular telecommunications network having a mobile switching center and a plurality of base stations that transmit and receive ra... | 11/17/1998 |
| 5835849 | Cellular mobile radio system comprising sub-cells A cellular mobile radio systems includes fixed stations and mobile stations, a radio cell being subdivided into sub-cells and each sub-cell being assigned its own allocation of radio channels. The values of radio parameters of the fixed stations are measu... | 11/10/1998 |
| 5832381 | Location updating in a cellular radio network A cellular radio network, subscriber equipment for the cellular radio network, and a method for carrying out a location updating in the cellular radio network, in which in the cellular radio network, or at least in part of it, several coincident logical l... | 11/03/1998 |
| 5822697 | Hybrid cellular radio communication system A hybrid cellular mobile communication system is disclosed that contains a first layer having a plurality of radio communication micro-cells, and a second layer of radio communication cells of a larger size which, in operation, overlay the micro-cells. Th... | 10/13/1998 |
| 5809422 | Distributed microcellular communications system A distributed microcellular communication system comprised of a plurality of subcells arranged within one or more conventional cells. The distributed microcellular communications system includes one or more remote site stations, each of which transmits an... | 09/15/1998 |
| 5805993 | Cell level change control device for cellular mobile radio networks with more than one level of cell A cell level change control device for cellular mobile radio networks with more than one level of cells includes means for comparing the value of a parameter representative of the speed of a mobile station with a threshold in order to decide if it is nece... | 09/08/1998 |
| 5787348 | Method of measuring speed of a mobile unit and a receiver for use in a wireless communication system A method of measuring speed of a mobile unit for use in a wireless communication system 20. The method includes the steps of receiving a radio frequency (RF) signal from the mobile unit 202, measuring signal quality of the RF signal to produce a received ... | 07/28/1998 |
| 5745852 | Land-line supported private base station operable in a cellular system A private base station supports the registering of multiple mobile stations and provides a personalized call delivery feature for each registered mobile station. Each mobile station registers separately with the base station when within communication rang... | 04/28/1998 |
| 5722072 | Handover based on measured time of signals received from neighboring cells A method for determining a handover for a mobile station in a multicellular communication system including the steps of measuring received signal parameters received from a serving cell and a plurality of neighboring cells, comparing received signal param... | 02/24/1998 |
| 5711005 | Method for implementing a personal access communication system in a high mobility environment A method for increasing the high mobility capacity of a personal access communications system (PACS) includes provides high and low tier channel links to service high and low speed subscriber units, respectively. The subscriber units determine their relat... | 01/20/1998 |
| 5642405 | Cellular communications system with centralized base stations and distributed antenna units A microcellular communications network includes a plurality of base station units and corresponding antenna units. Each includes either conventional transmitters and receivers or all digital transmitter and receiver equipment, and interface circuitry to a... | 06/24/1997 |
| 5640677 | Best server selection in layered cellular radio system A multi-level layered cellular radio architecture serves mobile subscriber stations moving within the system. Best server selection is performed for the mobile stations by assigning within each cell a preference value to each other one of the cells with w... | 06/17/1997 |
| 5627881 | Off-load-cellular system for off-loading cellular service from a main cellular system to increase cellular service capacity An off-load cellular system controls cellular service between a main cellular system and the off-load cellular system and provides off-load cellular service to a mobile telephone. The off-load cellular system includes a receiver circuit, monitoring and re... | 05/06/1997 |
| 5623535 | Operations of cellular communications systems based on mobility and teletraffic statistics collected by mobile units Each mobile unit in a cellular communications system accumulates at least one mobility or communications traffic (teletraffic) statistic representative of "typical" operation of the mobile unit within the cellular communications system. The mobile units p... | 04/22/1997 |
| 5594782 | Multiple mode personal wireless communications system A multiple mode, personal, wireless communications system exists within a radiotelephone network serving general customers and provides additional services to a select group of customers. The system uses handsets (32) which automatically switch between a ... | 01/14/1997 |
| 5579374 | Independent cell system of forward and reverse links A radio communication system includes: a plurality of forward base stations each forming a macrocell; a plurality of reverse base station each forming a microcell in the associated macrocell; and a mobile communication control office connected between the... | 11/26/1996 |
| 5574775 | Universal wireless radiotelephone system A universal wireless radiotelephone communication apparatus is operative in both a first radiotelephone communication system including a first base station having a wide area of coverage, transmitting radiotelephone signals at a first band of frequencies ... | 11/12/1996 |
| 5574971 | Mobile communication method and system for optimal selection of radio zone A mobile communication system is divided into a plurality of large zones, with each large zone being served by a large service area base station. The large zone is further divided into a plurality of small zones, each served by a respective one of a plura... | 11/12/1996 |
| 5557657 | Handoff between overlay and underlay cells A mechanism for handing off between an overlay cell (48) and an underlay cell (50). The underlay cell (50) is smaller than and has a common area with the overlay cell. A threshold level (RSSI-THP) is established which corresponds to the sum of a nominal t... | 09/17/1996 |
| 5551060 | Structure of cells within a mobile communication system A re-use partition of cells in a mobile communication system has an outer cell (30) and an inner cell (20) which is provided in the outer cell (30). An interval of cells using the same channel or the same frequency in the inner cells is shorter than an in... | 08/27/1996 |
| 5548806 | Mobile communication system having a cell structure constituted by integrating macro cells and micro cells A mobile communication system has a cell structure constituted by integrating macro cells and micro cells, and at least one mobile station. The cell structure is made to cover a service area by a plurality of the micro cells each having a predetermined si... | 08/20/1996 |
| 5533099 | Multi-mode radio telephone A radio telephone (200) is operable in a cordless telephone system or in a cellular telephone system, in each of which reception and transmission occur in time slots. A microprocessor (210) of the telephone has an additional control entity (212) which pre... | 07/02/1996 |
| 5530910 | Handover method in mobile communications system The handover method disclosed relates to a mobile communication system in which, based on the number of handovers in mobile units, the size of the radio zone to be assigned to a mobile unit is selected. The mobile switching center measures the number of h... | 06/25/1996 |
| 5521961 | Mobility management method for delivering calls in a microcellular network In a method of providing cellular telephone service to a mobile telephone located in an off-load cellular telephone system adjacent to a main cellular telephone system, the mobile telephone is registered with the off-load cellular telephone system upon th... | 05/28/1996 |
| 5513380 | Mobile speed dependent handover techniques in hierarchical mobile radio networks In A speed-dependent hand over procedure for hierarchic cell structures, a check is carried out given a mobile station traveling into A radio coverage domain of a micro cell to see whether the radio coverage of the mobile station with respect to the micro... | 04/30/1996 |
| 5499386 | Best server selection in layered cellular radio system A multi-level layered cellular radio architecture serves mobile subscriber stations moving within the system. Best server selection is performed for the mobile stations by assigning within each cell a preference value to each other one of the cells with w... | 03/12/1996 |
| 5491834 | Mobile radio handover initiation determination An intelligent mobile radio unit is served by one of a network of macrocells and microcells. The unit is arranged to monitor, for example, the signal strength or bit error ratio of signals transmitted from each of a set of candidate base stations of cells... | 02/13/1996 |
| 5487174 | Methods in a cellular mobile radio communication system The invention relates to methods for handling a bidirectional connection involving a mobile station in a cellular mobile radio communication system having adjacent cells of substantially different sizes, wherein the mobile station estimates the strength o... | 01/23/1996 |
| 5457810 | Mobile speed sensitive hand over method in hierarchial cell structures In a speed-dependent hand over method for hierarchic cell structures, a finding is made to whether mobile stations have traversed a radio coverage domain of a micro cell within a time interval. When the mobile stations are still in the radio coverage doma... | 10/10/1995 |
| 5396645 | System and method for determining whether to assign a macrocell or microcell communication frequency to a mobile communication terminal A system and method are provided for determining whether to assign a macrocell communication frequency or a microcell communication frequency to a particular mobile communication terminal for a particular communication interval of a communication session.... | 03/07/1995 |
| 5392453 | Method of effecting handover in a mobile multilayer cellular radio system A method of effecting handover in a mobile telephone system comprising fixed base stations and mobile stations. The system includes several layers of radio cells, where a cell in a given layer covers several cells in a nearest underlying or subordinate la... | 02/21/1995 |
| 5379446 | Cellular radio with microcellular/macrocellular handoff A cellular radio system comprises a plurality of basic stations each having a radio transceiver serving a cell of the system. A mobile station of the invention has a radio transceiver for communicating with one or other of the base stations, as well as lo... | 01/03/1995 |
| 5353332 | Method and apparatus for communication control in a radiotelephone system In a radiotelephone system, the control channel of each cell can be configured to broadcast absolute information about its cell and relative information about other cells including the characteristic of the cell. Further, the location of other control cha... | 10/04/1994 |
| 5345499 | Method for increasing two tier macrocell/microcell subscriber capacity in a cellular system A method for enabling the service of mobilies by a microcell, in a two tier cellular system, involves identifying a microcell coverage area and offsetting microcell signal strength for a time sufficient to allow a fast moving vehicle, desiring service and... | 09/06/1994 |
| 5278991 | Handover techniques In a cellular radio system having a two layer cell structure comprised by macrocells (1) overlaying microcells (2), handover occurs only via the macrocell layer. Thus when the quality of a call handled by a microcell (2) deteriorates below predetermined c... | 01/11/1994 |
| 5265263 | Handover techniques In a cellular radio system including a plurality of cells (e.g. cell sectors or micro cells) (4, 5, 8, 9, 10, 11) each normally using a respective channel for interference reduction purposes, a number of the cells are arranged in groups (6) and in the eve... | 11/23/1993 |
