Patent•
Communication system message authentication
26 Mar 1991-
TL;DR: In this paper, the authentication of system status OSWs in a trunked communication system is provided by first verifying (411) that a received system ID (313) matches a pre-programmed system ID before the information in the status OSW is programmed into a communication unit.
Abstract: Authentication of system status OSWs in a trunked communication system is provided by first verifying (411) that a received system ID (313) matches a pre-programmed system ID A system status OSW must then be matched twice before the information in the system status OSW is programmed into a communication unit (115), thus limiting the possibility of false decoding of system status OSWs
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Patent•
07 Jan 1996
TL;DR: In this article, a method for seamlessly transmitting application specific messages over cellular radio system control channels and switches, for use in wireless gaming and wagering, including the steps of: transmitting application-specific messaging bits, configured to appear as origination data packets having from eight to thirty-two digit fields, utilizing control channels, remote feature control request features, and IS-41 protocols.
Abstract: A method for seamlessly transmitting application specific messages over cellular radio system control channels and switches, for use in wireless gaming and wagering, including the steps of: transmitting application specific messaging bits, configured to appear as origination data packets having from eight to thirty-two digit fields, utilizing control channels, remote feature control request features, and IS-41 protocols. The messaging bits are transmitted over cellular control channels, for example, an AMPS, D-AMPS and TACS FSK modulated reverse control channel (RECC) 10 Kbps 48 word BCH hamming coded control channel. The messaging bits are then applied to communicate with, identify, monitor, and locate the application specific system, such as a wagering game, board game or other application specific system, thereby allowing for an integrated application specific two-way communications system. The application specific system may comprise card games, board games, video games, wagering games, and the like.
501 citations
Patent•
03 Apr 1996
TL;DR: In this article, a method and apparatus for wireless communication on an existing wireless communication network comprising taking existing data and manipulating the data to create manipulated data is presented, which is then translated into an application specific message.
Abstract: A method and apparatus for wireless communication on an existing wireless communication network comprising taking existing data and manipulating the data to create manipulated data. The manipulated data is then translated into an application specific message. The application specific message is applied to control and communicate with an application specific apparatus, whereby wireless communication on the existing wireless communication network is provided without causing any disruption, system overloading, or limitation on normal system communication activity.
369 citations
Patent•
17 Oct 1995
TL;DR: In this paper, a method and apparatus of transmitting subject status information, such as the status and location of a parolee or individual under house arrest, to a central monitoring station (CMS) operated by a parole staff or correctional facility is presented.
Abstract: A method and apparatus of transmitting subject status information, such as the status and location of a parolee or individual under house arrest, to a central monitoring station (CMS) operated by, for example, a parole staff or correctional facility. The subject status information is transmitted by a band or collar attached to, for example, the leg or wrist of the subject. A cellular radio communicator receives, encodes and transmits the subject status information over the control channel of a cellular radio communications network as control signals, bypassing the voice channels, to a mobile switching center (MSC) of the cellular radio communications network. The MSC decodes and forwards the subject status information over the public switched telephone network (PSTN) to the CMS. Optionally, the CMS may send a command to the communicator over the same data paths, i.e., the PSTN to the MSC, then over the control channel, formatted as a control signal, to the cellular radio communications network communicator. The communicator may integrate a paging receiver, or a satellite receiver, or other wireless receiver for receiving commands out of band, i.e., by way of communication networks other than the cellular radio communications network. The method and apparatus may also be utilized to track to position of more than one subject relative to other subjects or objects.
321 citations
Patent•
25 Jan 1996
TL;DR: In this paper, a method for seamlessly transmitting application specific messages over cellular radio system control channels and switches, including the steps of: transmitting application-specific messaging bits, configured to appear as origination data packets having from eight to thirty-two digit fields, utilizing control channels, remote feature control request features, and IS-41 protocols, is presented.
Abstract: A method for seamlessly transmitting application specific messages over cellular radio system control channels and switches, including the steps of: transmitting application specific messaging bits, configured to appear as origination data packets having from eight to thirty-two digit fields, utilizing control channels, remote feature control request features, and IS-41 protocols. The messaging bits are transmitted over cellular control channels, for example, an AMPS, D-AMPS and TACS FSK modulated reverse control channel (RECC) 10 Kbps 48 word BCH hamming coded control channel. The messaging bits are then applied to communicate with, identify, monitor, and locate the application specific system, thereby allowing for an integrated application specific two-way communications system. The application specific system may comprise a two-way paging system, a motor vehicle location status system, a motor personal location status system, a home arrest status system, a security system, a utility meter reading status and the like.
164 citations
Patent•
08 Jun 1993
TL;DR: In this paper, a transmitter identification system was proposed to determine if cellular phones in a cellular phone system are authorized as distinguished from cloned phones, operated by fraudulent users, that are unauthorized.
Abstract: A transmitter identification system to determine if cellular phones in a cellular phone system are authorized as distinguished from cloned phones, operated by fraudulent users, that are unauthorized. Components used in the manufacture of cellular phones vary slightly from one phone to anther so that, when the phones are used, the transmitter signals from each phone have different external signal traits. For each cellular phone call, the transmitter signal is received and characterized using a received set of features resulting from the external signal traits. The received set of features is compared with previously stored sets of Features in a database to determine if the call is authorized or unauthorized and, if unauthorized, the call is stopped and access to the fraudulent user is denied.
138 citations
References
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Patent•
16 Sep 1987TL;DR: In this article, the authors propose a registration procedure to prevent frequent re-registrations when the mobile station repeatedly crosses the boundary between two service areas, and when it registers with a new base station and hence a new service area it retains its registration with at least one service area with which it is already registered.
Abstract: A mobile radio tarnsmission system comprises a plurality of base stations (BS) with corresponding service areas (SA) which together cover a geographical area through which mobile stations (M) can roam. Each base station is connected to a central station (CS) by means of a respective two-way communication link (CL). In order that it can be contacted without all the base stations having to put out a call, each mobile station registers in known manner with the base station in whose service area it is situated, and this is recorded by the control station. When it roams into a new service area this process is repeated. However, in order to preclude frequent re-registrations when the mobile station repeatedly crosses the boundary between two service areas, when it registers with a new base station and hence a new service area it retains its registration with at least one service area with which it is already registered, thereby creating its own customized enlarged registration area. Thus the transmission overhead created by the registration procedure is reduced.
141 citations
Patent•
19 Jun 1987TL;DR: In this article, a trunked communication signalling protocol is provided by a unifying signalling protocol in which subscribers request communication channels using only their individual IDs encoded into a single ISW, and the central decodes the call request, extracts the requesting subscriber's individual ID, which is cross referenced to determine the subscriber's talk-group affiliation(s).
Abstract: A trunked communication signalling method is provided by a unifying signalling protocol in which subscribers request communication channels using only their individual IDs encoded into a single ISWs. The central decodes the call request, extracts the requesting subscriber's individual ID, which is cross referenced to determine the subscriber's talk-group affiliation(s). If the requesting subscriber's affiliation(s) are not known, the central commands the subscriber to transmit its affiliation using dual ISW signalling. In another aspect of the present invention, each subscriber automatically informs the central of a change in talk-group affiliation, thereby providing continual affiliation updates. In this way, many thousand subscribers are afforded access to a single trunked system, and control channel traffic congestion is minimized.
85 citations
Patent•
02 Jan 1987TL;DR: In this paper, a programmable controller uses instructions in a non-volatile reprogrammable memory to decode and process the signals, and to output the information contained in the signals in a useable form.
Abstract: A communication receiver which can decode signals transmitted by radio frequency propagation. A programmable controller (36) uses instructions in a non-volatile reprogrammable memory (46) to decode and process the signals, and to output the information contained in the signals in a useable form. The controller also responds to predetermined signals by decoding and processing information for new decoding and operating instructions, and stores the data in a temporary memory (48). Logic circuitry responds to subsequent predetermined signals to enable selective reprogramming of the non-volatile reprogrammable memory by data stored in the temporary memory to alter the decoding characteristics of the receiver.
71 citations
Patent•
26 Nov 1986TL;DR: In this paper, a method and apparatus for coordinating the transfer of communications control from one independent radio communications system to another is disclosed, where a remote unit which communicates data messages is associated with a home system which has a plurality of fixed sites and overlapping radio coverage areas.
Abstract: A method and apparatus for coordinating the transfer of communications control from one independent radio communications system to another is disclosed. A remote unit which communicates data messages is associated with a home system which has a plurality of fixed sites and overlapping radio coverage areas. As the remote unit travels away from its home system, communications may be maintained by providing radio coverage from an independent roam system. The last message received by the home and roam systems from the remote unit has the associated radio signal strength and time of reception stored at each system. When a current message is transmitted by the remote unit and both the home and the roam system receive the message, the roam system time stamps the message and calculates the signal strength associated with the current message. If the amount of time elapsed between the last and the current message exceeds a predetermined amount of time or if the signal strength exceeds a predetermined threshold, the roam system requests transfer of control of the processing of the current message from the home system. When the home system receives this request, it calculates the difference in signal strength between the signal strength of the current message as received by the roam system and the signal strength of the current message as received by the home system. If the difference exceeds a predetermined amount, the request of the roam system to further process the message is granted.
71 citations
Patent•
05 Nov 1985TL;DR: In this article, a dispatch trunked radio system (100) which provides for individual subscriber to subscriber communication as well as other enhanced trunking features is presented. But the system is not compatible with prior ''single-word'' subscriber units.
Abstract: A dispatch trunked radio system (100) which provides for individual subscriber to subscriber communication as well other enhanced trunking features. An expanded ''dual-word'' signalling protocol (Fig. 4) provides an improvement over prior ''single word'' signalling protocols (Fig. 2) by increasing the versatility of commands which may be communicated between the components of the trunked radio system (100). The ''dual-word'' signalling protocol (Fig. 4) of the present invention remains compatible with prior ''single-word'' subscriber units.
55 citations