Abstract: A method and apparatus improves the accuracy of a wireless location finding system based on the use of multipath signal signatures. A location finding apparatus measures an array covariance matrix R of a signal. The covariance matrix is compared to a database of signatures comprising calibrated signal subspaces. The comparison is based on calculating the projection of R onto each calibrated subspace. From these calculations a set of likely locations is then determined.

Abstract: A wireless communications system and method of operating the same for reducing fraud, the system including a home carrier for providing wireless services to a subscriber within a predetermined area, and an HLR memory associated with the home carrier for storing home locator records for each subscriber. The home locator record defines the level of service to be provided to the subscriber, and is initially configured to prohibit call termination when the subscriber is outside of the home carrier area. Fraud is reduced in the system by initially prohibiting call termination through the HLR record, and then only permitting call termination if the subscriber has paid in advance for wireless services. If so, then the system temporarily reconfigures the HLR record to permit call termination. When the call ends or the pre-paid amount is depleted, the system resets the HLR to again prohibit call termination.

Abstract: A mobile terminal registration system is provided for a mobile communication system having a plurality of base stations making respective radio zones and a mobile terminal that moves in the radio zone and registers its location to the base stations. The mobile terminal comprises a location registration section for detecting reception levels of signals from the base stations, calculating a difference of the largest reception level and the second reception level and registering the mobile terminal location to a base station that transmits the largest reception level signal if the difference is larger than a threshold value.

Abstract: A distributed wireless call processing system includes a plurality of mobile transceiver units each having the capability to simultaneous receive, reprocess and retransmit a plurality of calls to form a plurality of call paths within the network formed by the units. Within each mobile transceiver unit, a multilevel audit buffer is maintained which is used to store identification and power level data in accordance with a vector ring diagram. The first level of each mobile transceiver unit stores data relating to directly reachable transceiver units. Successive levels of each transceiver's audit buffer store data which has been downloaded upon request from the audit buffers of other transceiver units. The multilevel audit buffering provides for establishment of call vectoring paths between a seeking transceiver unit and a desired transceiver unit.

Abstract: A wireless communication device and method which includes the introduction of a auxiliary receiver or transceiver which is included in a base station or mobile terminal in addition to a transceiver used to communicate between devices. The auxiliary receiver or transceiver serves to monitor conditions on available communication channels other than the channel currently being utilized for communication between devices.

Abstract: A comparator (5) compares a detected voltage obtained by detecting an output power of a nonlinear amplifier (2) with a reference voltage to generate a control voltage for the nonlinear amplifier (2). The control voltage is converted into such a control voltage as to cancel the nonlinearity of the nonlinear amplifier (2) by a nonlinearity compensating circuit (7) and is supplied to the nonlinear amplifier (2). The nonlinear compensating circuit (7) is comprised of a diode (71) and a resistor (72).

Abstract: A method and apparatus for location finding in a wireless communication system uses multipath signals in order to accurately determine a transmitter's location. Direct path and multipath signals from a mobile transmitter [74] arrive at an antenna array [80, 82, 84] of a base station receiver [76]. The base station determines signal signature from a subspace of an array covariance matrix. The signature is compared to a database of calibrated signal signatures and corresponding locations, and a location whose calibrated signature best matches the measured signature is selected as the most likely transmitter location. The database of calibrated signal signatures and corresponding locations is generated by a calibration procedure in which a phone [74] transmits location data derived from a GPS receiver [88] and GPS satellites [90, 92, 94] to the base station [76] which records the location information together with the signal signature of the transmitter [74].

Abstract: An improved home location register (HLR) that includes a switch capability mediation module for implementing switch capability mediation between different mobile switching centers (MSCs). According to the invention, when one MSC (home MSC of a receiving party) attempts to communicate with another MSC (serving MSC) via the HLR serving the home MSC, the mediation module determines whether the two MSCs are provided by different vendors and whether they implement different capabilities, based on the MPCM (MSC ID Point Code Map) file records of both the originating and serving MSCs. The MPCM files store MSCs' network configuration information.

Abstract: A coaxial repeater of the present invention includes a connector having an L shaped metal piece 1 and an insulating casing 2. The connector is mounted in an introducing hole 3a-1 provided in a casing 3. A connecting portion 8a of an amplifier portion 8 is electrically connected to one of protrusions of the connector and a center conductor 4a-1 of an adapter 4-1 is fitted in and electrically connected to the other protrusion of the connector. The introducing hole 3a-1 becomes a space 3g-1 when the adapter 4a-1 and the amplifier portion 8 are mounted. The space 3g-1 is shielded from a receiving space 3b of the casing 3. With the coaxial repeater constructed as mentioned above, it is possible to improve electrical characteristics of a device operating in a high frequency band, facilitate the maintenance thereof, reduce the number of parts thereof and reduce the cost of parts.

Abstract: A method for call establishment in a cellular radio system including a mobile services switching center and a private branch exchange connected thereto, and a visitor location register for storing subscriber data on subscribers located within the service area of the mobile services switching center. To optimize call establishment, when the private branch exchange receives a connection establishment request from a subscriber located within its service area, the private branch exchange checks whether the private branch exchange is the home private branch exchange of the subscriber that sent the connection establishment request. If the private branch exchange is the home private branch exchange of the subscriber, the private branch exchange performs independently authentication, activation of ciphering procedures and assignment of a temporary subscriber identity and only thereafter sends a connection establishment request to the mobile services switching center.

Abstract: In this approach to implementing a wireless communication system, in band translator components are located in the center of remote cells which would normally contain a base transceiver system (BTS). Selective diversity processing is implemented in the translators by providing for at least two spatially separated receive antennas and two receive path circuits in the up link direction. A diversity circuit is time synchronized to the downlink signal to provide for proper detection and selection of the appropriate signal to be forwarded to a centralized BTS. As a result, a separate diversity path need not be maintained for the remainder of each backhaul link, and radio frequency components such as a second upconverter, synthesizer and power amplifier associated with the range extender can be eliminated.

Abstract: When a second mobile machine requests the communication of priority data with a base station while a first mobile machine conducts the communication of non-priority data with the base station, the base station transmits wait information to the first mobile machine by using a down link control channel to control the first mobile machine to the waiting state and allocates the down link control channel to the second mobile machine to control the second mobile machine to conduct the communication of the priority data. When the communication of the priority data with the second mobile machine is completed, the base station transmits communication resumption information to the waiting first mobile machine by using the down link control channel to resume the communication of the non-priority data.

Abstract: A dealer-locator service is provided to mobile telephones (40) in a mobile telecommunications system (FIG. 1). When a mobile telephone initiates a call to the dealer-locator service, a mobile telephone switching office (MTSO 41) identifies the one of a plurality of base stations (20-23) through which the call is made. A dealer-locator service apparatus (43-45) then uses this base-station identification, rather than the telephone number of the calling mobile telephone, to look up in a dealer-locator database (300-301) the one of a plurality of business locations (30-33, 50-52) of the dealer that is in the vicinity of the identified base station, and hence in the vicinity of the calling mobile telephone. The apparatus then reports the address of the one business location to the caller, and optionally also causes the MTSO to connect the call to a telephone number of the one business location.

Abstract: In order to to enable an operator to control the subscriber's long distance carrier usage in a telecommunications network, a new subscriber-specific parameter, a locking parameter, is added to the subscriber data by the operator, in addition to a preferred long distance carrier access code. The locking parameter defines whether said subscriber is allowed to select the long distance carrier for the call or not. The locking parameter is checked each time the subscriber dials the long distance carrier access code during an originating call setup. In an embodiment of the invention, if the locking parameter indicates the subscriber is not allowed to select the long distance carrier, the call setup will be always terminated, preferably after making an announcement for informing the subscriber of the cause of the termination.

Abstract: In a TDMA or CDMA cellular telephone network including a plurality of registration areas, and in instances of mobile station cell re-selection between a cell located in a first registration area and a cell located in a second registration area, the mobile station processes control or pilot channel signal strength measurements in view of both a conventional reselection hysteresis and an additional registration hysteresis. Reselection is performed by the mobile station when the control or pilot channel signal strength measured with respect to the second registration area cell exceeds the control or pilot channel signal strength measured with respect to the first registration area cell by the sum total of both the reselection hysteresis and the registration hysteresis.

Abstract: A mobile subscriber is able to request an outgoing call setup without dialing a Numbering Plan Area (NPA) number. A mobile subscriber specifies a particular NPA number to be used with all subsequently dialed local calls. The user specified NPA number is encapsulated into an Unstructured Supplementary Service Data (USSD) message and transported over to the associated home location register (home HLR). Whenever the mobile station performs a location update, or stores a new NPA number, the home HLR copies the stored NPA number to the serving mobile switching center (MSC). Subsequently, whenever the mobile station originates an outgoing call setup with only a local directory number, the MSC retrieves the copied NPA number and generates a complete B-number by concatenating the retrieved NPA number with the subscriber dialed local directory number. The generated B-number is then utilized to properly process the outgoing call setup.

Abstract: An analog cellular voice telephone system and subscriber stations associated therewith are controlled to conserve power and to provide alternate service carriers. Acquisition of all of the service carriers is facilitated through the use of system identification numbers (SIDs) associated with each service carrier. A roaming subscriber will tune to a cellular digital packet data (CDPD) frequency to obtain a list of service carriers operating within that geographical area. Based upon a comparison with a preferred SID list stored in the subscriber station, an available service carrier will be selected by the subscriber station, and registration with the selected service carrier will take place. Usually, analog voice communication is suspended until the selection process takes place.

Abstract: A network interface terminates communication between a disconnecting party (i.e., requesting a disconnect from the network interface) and a disconnected party in communication with the disconnecting party. The disconnecting and disconnected parties are connected to first and second networks, respectively. When receiving a disconnect request from the disconnecting party, the network interface initiates communication termination for the disconnecting party. If there is no buffered data to be transmitted to the disconnected party, the interface begins communication termination for the disconnected party. Otherwise, the interface transmits the buffered data to the disconnected party and then initiates communication termination for the disconnected party.

Abstract: There is provided a method and an arrangement for flexible coexistence of several radio communication systems on a common radio frequency band. The radio frequency band has a larger bandwidth than the communication frequency band of the several radio communication systems. Prior to the start of a radio communication, the radio frequency band is scanned by a radio transceiver unit of a system for the detection of the presence of interference. The transceiver units are arranged to establish communication over any idle part of the radio frequency band comprising or covering the communication frequency band, thereby avoiding the need for frequency or channel planning. The invention can be used in Personal Communication Systems (PCS) or Cordless Terminal Mobility (CTM) services and Radio in the Local Loop (RLL) applications.

Abstract: A radio communication analyzer tests the signal characteristics of a carrier, as a target signal to be tested, which has undergone quadrature modulation using a digital data signal output from a radio unit to be tested. A quadrature demodulation section performs quadrature demodulation of the target signal and outputs a baseband signal. A storage section stores the waveform data of the baseband signal. A clock synchronous detection section detects clock synchronization information contained in the target signal based on the waveform data. A demodulation section sequentially reads out the waveform data and obtains demodulated digital data in accordance with the clock synchronization information. A burst synchronous detection section generates burst synchronization information representing a burst start position of the target signal on the basis of the demodulated digital data or the waveform data.