Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 5247698 | Use of an audit message sent to mobile stations to confirm the location thereof A mobile communications system includes at least one subscriber; a home exchange for the at least one subscriber; at least two exchanges, which may include the home exchange, that may be accessed by the at least one subscriber; and means for ensuring that... | 09/21/1993 |
| 5230082 | Method and apparatus for enhancing signalling reliability in a cellular mobile radio telephone system A method and apparatus for achieving reliable transmission of signalling messages in a cellular system in which the frequency plan, frequency/time slot allocation plan, code channel allocation plan, or dynamic/adaptive channel allocation rule of the syste... | 07/20/1993 |
| 5222247 | Method for maximizing channel selection in a communication system A communication system (100) has at least one base site (204) which includes a plurality of transceivers (110A-C) operating on a plurality of communication channels for communicating to at least one of a plurality of communicators (108). The at least one ... | 06/22/1993 |
| 5218630 | Method for channel utilization in extended spectrum communication systems A base station allocates radio channels to radio telephone handsets in a second generation cordless telephone (CT2) communication systems by scanning each channel in a first band, and scanning each channel in a second band to measure an RSS level for each... | 06/08/1993 |
| 5212831 | Method and apparatus for autonomous adaptive frequency assignment in TDMA portable radio systems To assign and coordinate radio frequencies at the fixed ports (30, 40, 50, 70) of a frequency-reusing radio communications system (5), most existing methods require pre-engineering or impose high complexity in system controller and port hardware. A simple... | 05/18/1993 |
| 5206882 | System for and method of creating and assigning address codes in a cellular spread spectrum system A system and method for developing and assigning address codes in a radiotelephone communication system using spread spectrum modulation techniques based upon an analysis of signal strength and without reference to a geographic pattern.... | 04/27/1993 |
| 5203012 | Method and apparatus for optimum channel assignment A method and apparatus for choosing the most optimum communication channel in a system (100) having a plurality of communication channels provides for reduced interference and increased system capacity. By establishing a set of threshold levels and compar... | 04/13/1993 |
| 5193091 | TDM communication system for a wide area site and a plurality of local sites A time division multiplexed system is disclosed in which communication messages among a wide area site and a plurality of substantially scattered local sites are communicated on a radio frequency channel which is divided into a plurality of time slots, wh... | 03/09/1993 |
| 5159596 | Mobile communication system A mobile communication system based on a time division communication system comprising: mobile radio units for transmitting and receiving time-compressed and segmented signals by a radio channel allocated to time slots; radio base stations to which a comm... | 10/27/1992 |
| 5140695 | Channel assignment system in mobile communication system In a mobile communication system between a mobile station and a telephone network through a base station which assigns a communication channel so that it satisfies required communication quality or D/U ratio, said base station comprises a moving speed det... | 08/18/1992 |
| 5128981 | Radio communication system and a portable wireless terminal This invention proposes a radio communication system including a plurality of radio terminals, a relay apparatus (including a plurality of base stations and an exchange station) connected to each radio terminal so that the radio terminals can interchange ... | 07/07/1992 |
| 5124985 | Radiocommunication system using time-division digital frames A radiocommunication system comprising a base station and a plurality of terminal stations. The base station includes a transmitting section for arranging a plurality of digital frames on a time-division basis, assigning a channel number to each digital f... | 06/23/1992 |
| 5123111 | Cellular radiotelephone system, a method of protecting the data base of a visitor location register against saturation In a cellular radiotelephone system, the data base of a visitor location register is protected from saturation by releasing n-tuplets from the data base corresponding to those temporary mobile identity words corresponding to mobiles which announced their ... | 06/16/1992 |
| 5111534 | Method for assigning telecommunications channels in a cellular telephone system A method of assigning frequencies in a cellular telephone system in which a first group of the available frequencies is assigned to a first cell, and then distinct groups are assigned to adjacent cells, leaving at least one distinct group of frequencies f... | 05/05/1992 |
| 5093924 | Channel assigning method in a mobile communication system According to a channel assigning method for use in a mobile communication system, a base station selects, in response to a communication connection request, a communication radio channel having an interference wave reception level which is obtained by a m... | 03/03/1992 |
| 5093925 | Three dimensional cellular communication system with coordinate offset and frequency reuse A three dimensional cellular communication system comprising a plurality of cells arranged in a multi-level environment to reduce interference and improve frequency reuse in both horizontal and vertical directions by offsetting cells stacked on different ... | 03/03/1992 |
| 5081704 | Method of arranging radio control channels in mobile communications According to a method of arranging radio control channels in mobile communications, for covering a service area with a plurality of radio zones and causing base and mobile stations to exchange signals through the control channels, a broadcasting informati... | 01/14/1992 |
| 5014342 | Communication system employing a nine channel pattern allocation to eliminate interference In a communication system having a plurality of base stations for communication with mobile terminals, each station is allocated one of nine communication channels. The allocation is arranged such that adjacent channels are spaced further apart than non-a... | 05/07/1991 |
| 4977589 | Signalling and control protocol for a communication system A signalling and control protocol is provided wherein each subscriber unit (106) operating within a communication system (100) must transmit a request (200, 200' or 200") to communicate to a central station. If a communication channel is available, the ce... | 12/11/1990 |
| 4972506 | Method of transmitting data information in a mobile, cellular radio communication system Method of transmitting data information in a mobile, cellular, radio communication system operating according to the TDMA principle. Within certain large cells (C2) in the system the number of calls in progress is less than the number of slots (CH1, CH2 .... | 11/20/1990 |
| 4965850 | System for and method of assigning frequencies in a communications system with no central control of frequency allocation A system for and method of assigning frequencies in a mobile telephone communication system wherein there is no central control of frequency channel allocations and wherein such assignment is made by real time signal comparisons without reference to geogr... | 10/23/1990 |
| 4955050 | System configuration of wireless PBX and communication method therefor A system configuration of wireless PBX (Private Branch Exchange) and communication method therefor with high user facility. In the system configuration of wireless PBX and communication method therefor, a specified telephone number is assigned to each por... | 09/04/1990 |
| 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 |
| 4887265 | Packet-switched cellular telephone system A unique packet-switched cellular telephone system includes a cellular switch (140) and base sites (110) for providing packet-switched data services to cellular data telephones (102). Cellular switch (140) includes packet access points (152, 153) coupled ... | 12/12/1989 |
| 4882751 | Secure trunked communications system A trunked communications system that accommodates encrypted secure communications. The system uses both non-encrypted message detectors and encrypted message detectors to assure that the trunked central control unit receives the signals it must receive in... | 11/21/1989 |
| 4866710 | Reuse groups for scan monitoring in digital cellular systems An improved TDMA radiotelephone cellular communication system employs an improved cell site scan monitoring technique. The technique includes monitoring radiotelephone calls, and tracking and recording their signal qualities. The records are used to maint... | 09/12/1989 |
| 4866788 | Process for controlling retransmission of messages from transmitting stations belonging to a cellular system A process for controlling retransmission of messages from transmitting stations belonging to a cellular system. The stations transmit messages to a fixed base station, e.g. for requesting the allocation of a dedicated channel for the communication. These ... | 09/12/1989 |
| 4850033 | Method of and control arrangement for selecting a control channel by a mobile radio station In prior cellular radio transmission systems a base radio station (BS) periodically transmits references identifying control channels associated with such base radio station, references identifying control channels of adjoining base stations, and referenc... | 07/18/1989 |
| 4827499 | Call control of a distributed processing communications switching system A method and apparatus for controlling calls in in a distributed processing communications switching system. A call is assigned to any one of a plurality of call control processors. The assigned processor thereafter directs the establishment of communicat... | 05/02/1989 |
| 4775999 | Registration of radiotelephones in networked cellular radiotelephone systems Adjacent cellular systems (101-103) are interconnected to form a network providing telephone coverage to mobiles located throughout their combined coverage areas (111-113). Each networked cellular system (101-103) includes base sites (412, 414, 416) locat... | 10/04/1988 |
| 4775998 | Cellular radiotelephone system having colocated base sites A cellular radiotelephone system (101) includes a control terminal (420) coupled by in trunks and out trunks to the telephone central office (110) and by data and voice lines to base sites (411-416) in corresponding cells (401-406) for providing telephone... | 10/04/1988 |
| 4771448 | Private cellular system A cellular mobile radio communication (e.g. telephone) system (hereinafter referred to as a private cellular system, PCS) that does not have the constraint of being a well defined, pre-planned system. The present invention differs from previous systems la... | 09/13/1988 |
| 4763322 | Digital radio transmission system with variable duration of the time slots in the time-division multiplex frame A cellular digital radio transmission system wherein messages are transmitted from a base station to a plurality of mobile stations assigned to it by time-division multiplexing of time slots in respective TDM time frames, each mobile station being assigne... | 08/09/1988 |
| 4754453 | Digital radio transmission system with a connection-accompanying organization channel in the time-division multiplex frame Method of digital radio transmission between a base station and a plurality of mobile stations. A time division multiplexed signal frame is generated, including a plurality of time slots which repeat each frame interval. A beginning number of the time slo... | 06/28/1988 |
| 4751725 | VOX remote unit control in a cellular system A cellular radiotelephone system providing service to remote units having a voice operated transmitter (VOX) is disclosed. If the regularly scheduled periodic signal quality measurements made by fixed site equipment indicate that the remote unit signal ha... | 06/14/1988 |
| 4736453 | Method and apparatus for making frequency channel assignment in a cellular or non-cellular radiotelephone communications system A system and method for assigning mobile units to selected channels in a cellular or non-cellular wherein the system includes means for comparing the control signals between each pair of mobiles and a base and means for evaluating said control signals by ... | 04/05/1988 |
| 4712229 | Multiple access radio telephone system selectively operating on full-duplex and half-duplex modes A multiple access radio telephone system is connected to a telecommunication switching system and serves a group of N remote stations through M two-way radio channels (where M is smaller than N). The remote stations have corresponding subscriber line term... | 12/08/1987 |
| 4697260 | Method of and arrangement for transmitting messages in a digital radio transmission system A method and apparatus for use in a digital radio transmission system comprising stationary radio stations arranged in a cellular network and to which are assigned a plurality of mobile radio stations. Transmission of digital messages from a stationary ra... | 09/29/1987 |
| 4686671 | Cellular communication system operable with transmission pathfault A communication system with fixed stations (FS), mobile stations (MS), and control stations (LS) is disclosed in which the control stations are interconnected by transmission paths and have additional, closed transmission paths connected to them. In the t... | 08/11/1987 |
| 4672657 | Multichannel telephone system A multi-channel RF telephone system that utilizes a dedicated channel status monitor to develop a list of available communications channels, and a common channel transceiver to transmit this list to the telephones. The telephones select a channel to use f... | 06/09/1987 |
