Abstract: A digital system is provided with an interface circuit for interconnecting two modules in different clock domains. The interface circuit can selectively respond to a request signal from a remote source and immediately de-assert a ready signal in response to either a rising edge or a falling edge of the request signal asynchronously to a local clock signal. When an internal circuit connected to the interface circuit has completed a requested operation, the interface circuit asserts the ready signal. The ready signal is de-asserted and asserted in a glitchless manner so that the remote module can respond to the ready signal asynchronously to a remote clock signal.

Abstract: A method is disclosed for determining whether to transmit from a first unit to a second unit, where the transmission is one of a first type and a second type. In the method, a signal from the second unit is received at the first unit, and the strength of the signal as received at the first unit is measured. A determination is made of whether the transmission is of the first type or the second type, and a first threshold is selected if the transmission is of the first type, or else a second threshold is selected if the transmission is of the second type. The measured signal strength is then compared to the selected threshold, and the transmission proceeds only if the measured signal strength exceeds the selected threshold.

Abstract: In a mobile radio communication system including mobile stations; radio base stations which communicate with the mobile stations via connections on radio waves; base station controllers for controlling radio base stations thereunder; and mobile services switch centers, an upstream selection process section, which is provided to the base station controller for executing a selection process, operates in two operation modes (“normal mode” and “through mode”) with respect to each mobile station.

Abstract: An automatic simulcast correction method (300) for a selective call receiver (100) includes the steps of measuring a received signal (304) for a received signal strength indication measurement and then determining if a protocol indicates a simulcast signal (310). If the received signal strength indication measurement is above a predefined threshold and the protocol indicates the simulcast signal, then the selective call receiver is optimized for simulcast delay spread distortion (312). If the received signal strength indication measurement is below a predefined threshold or the protocol does not indicate the simulcast signal, then the selective call receiver is optimized for static sensitivity (314).

Abstract: A method for establishing a communication link between a telecommunications network and a mobile station via a local station connected to said telecommunications network and a short range radio channel between said local station and said mobile station comprises a step in which at least one property of said radio channel is negotiated between said local station and said mobile station, a step in which said mobile station enters a power saving mode, a step in which said mobile station enters an active mode, and a step in which said local station links said mobile station to said telecommunications network via said radio channel using said at least one negotiated property. A local station and a mobile station have corresponding features. The invention is especially adapted for portable telephone and data transmission devices.

Abstract: A method for operating a mobile satellite telecommunications system has steps of (a) providing a user terminal that is operable to simultaneously receive a communication signal from a gateway via a plurality of satellites; and, (b) at the gateway, selectively transmitting the communication to one satellite or a plurality of satellites each having a coverage area that includes a current location of the user terminal. The step of selectively transmitting includes a step of considering a plurality of factors, including a current reception state of the user terminal, a current state of satellite power of at least one of the plurality of satellites, and a predicted required state of satellite power of the at least one satellite. The current reception state of the user terminal is indicated by a received signal quality indicator, which in the preferred embodiment is expressed as the Frame Error Rate (FER).

Abstract: A transmitter/receiver combination system and a transmission signal canceling method for use in a wireless communication system using a single common antenna are provided. The system includes a circulator for receiving an original transmission signal from the transmitter, transmitting the received transmission signal to an antenna without a signal loss, and transmitting a reception signal received from the antenna to other ends without a signal loss, and a transmission signal canceller for dividing the transmission signal input in an attenuated form as much as a predetermined magnitude via the circulator together with the reception signal into two paths, producing two is phase inverted transmission signals with the same magnitude and delay time as those of the original transmission signal, and recombining the produced two transmission signals with each other, to thereby canceling the transmission signal and transmitting only the reception signal to the receiver.

Abstract: A receiver in a code-division-multiple-access network includes a forward detector, a first feedback detector, a set of second feedback detectors, a slicer and an arithmetic logic unit for detecting each one of the multiple transmitted signals. The forward detector has an input connected to receive the sum of the multiple transmitted signals. The arithmetic logic has an input connected to an output of the forward detector. The slicer has an input connected to an output of the arithmetic logic unit. The first feedback detector has an input connected to an output of the slicer and an output is connected to the input of the arithmetic logic unit. Each of the second feedback detectors has an input connected to the output of a slicer for each of the other slicers and an output is connected to the input of the arithmetic logic unit. The output of the slicer provides the detected signal, for each transmitter.

Abstract: In a radio communication system, efficient information provision services obtained, where various information is provided to mobile communication terminal devices separately from call services, update information on information to be provided is transmitted from a base station unit, and a mobile communication terminal device receives the update information and then receives the desired information upon confirming that the desired information has been updated. Consequently, due to the ability to easily determine whether or not the information to be provided has been updated, the mobile communication terminal device need not receive all the information or connect to an information service center, but can efficiently use the information provision services.

Abstract: Each communication unit (112A through 112F) and talkgroup in a communication system (100) is assigned a priority at each site (106, 108, and 110) in the system. As communication units (112A through 112F) request resources, contention among requesters at a site is resolved by the priority of requesters at the site. System-wide resources are allocated equitably based on the geographical location of the communication unit using site-based priority.

Abstract: A method and system for providing selective interference mitigation (or nulling) in an adaptive array system. A communication device, typically employing an adaptive array, determines an indication of signal reception quality for a first remote user terminal in communication with the communication device. The communication device provides a first mode of operation wherein a first amount of nulling with respect to at least one interfering source is generated by the communication device. In addition, the communication device provides a second mode of operation characterized by generating a second amount of nulling with respect to the at least one interfering source, wherein the second amount of nulling is relatively greater than the first amount of nulling. Based on the relative signal reception quality indication, the communication device selects one of the first and second modes of operation.

Abstract: The present invention reduces the degradation in performance of one or more radio signals that are co-transmitted with a first radio signal from the same transmitting antenna in the same frequency channel and received by the same antenna due to multipath or other shared interference, where the one or more radio signals can be separated from the first radio signal.

Abstract: In a wireless network containing battery powered stations, one station is designated as a control point (CP). Each of the remaining stations has two operating modes: an active mode in which it receives and transmits messages, and an inactive or sleep mode which incurs reduced power consumption. The Control Point periodically transmits a beacon signal, and each station switches to its active mode to receive at least some of these beacon signals. A beacon signal may indicate that data is available for transmission to a particular station (from another station), in which case that particular station then broadcasts a message to indicate that it is awake and can receive messages.

Abstract: There is disclosed an apparatus for interconnecting a plurality of communications mediums, including voice frequency and broadband frequency to a subscriber communications system at the subscriber's premises. The apparatus comprises: 1) a controller for coupling and de-coupling communications mediums comprising at least one public service telephone network (PSTN) line and at least one non-public service telephone network (non-PSTN) line, to a communication system within the subscriber's premises; 2) lightning protection for controller interfaces; 3) a detector circuit for detecting power loss in the non-public service telephone network connection and 4) fail-over (re-connecting to an alternate circuit) devices connected to a public service telephone network line; and 5) a test circuit for monitoring the condition of a backup power supply for the apparatus.

Abstract: The present invention discloses a system and a method for providing information to a communication device in response to a request for such service received from the communication device. The request may be in the form of a digits request trigger or short message service (SMS) origination message that is initiate from a wireless telephone. The digits request trigger and SMS origination request may be initiated when a user selects a menu option or it may be initiated using a microbrowser. The digits request trigger or SMS origination message is sent from the communication device to a wireless web information services gateway. The gateway retrieves the requested information from one or more sources. The gateway then forwards the retrieved information to the user via an SMS message or via a microbrowser message. The information may be formatted according to a preselected configuration that is stored in a user service information profile.

Abstract: The invention expedites the delivery of a call originating in a circuit-switched network to a mobile terminal camped on a packet-switched network. Information representing the location of the mobile terminal in the packet-switched network is provided to the circuit switched network. A call setup with the mobile terminal is initiated with reference to the previously received location information, frequently more expeditiously and using less resources. Location-based services are also provided by the circuit-switched network with access to such mobile terminal location information.

Abstract: A cellular telephone system, including a cellular telephone transceiver unit, an ear piece which receives the voice vibrations of a user, and a wireless linkage operatively connecting the ear piece to the cellular telephone transceiver unit, allows a user to be in a hands-free mode when using a cellular telephone. The cellular telephone transceiver unit includes a personal digital assistant and a pager with a vibration module. The ear piece generally uses a bone sensor along with an air sensor placed in the external auditory canal of the user to detect the voice vibrations of the user. Further, a speaker is included in the ear piece to allow the user to hear incoming data from the cellular telephone transceiver. The wireless linkage uses low power radio frequency waves to send and receive signals between the ear piece and the cellular telephone transceiver unit. Both the ear piece and the cellular telephone transceiver unit require power which is supplied by batteries.

Abstract: A wireless communication device including a radio frequency (RF) circuit, a ZIF transceiver and a baseband processor. The ZIF transceiver includes an RF mixer circuit that converts the RF signal to a baseband input signal, a summing junction that subtracts a DC offset from the baseband input signal to provide an adjusted baseband input signal, and a baseband amplifier that receives the adjusted baseband input signal and that asserts an amplified input signal based on a gain adjust signal. The baseband processor includes gain control logic, DC control logic and a gain interface. The gain control logic receives the amplified input signal, estimates input signal power and asserts the gain adjust signal in an attempt to keep the input signal power at a target power level. The DC control logic estimates an amount of DC in the amplified input signal and provides the DC offset in an attempt to reduce DC in the amplified input signal.

Abstract: A telephone switching system and method for switching CENTREX (CTX) calls between CTX subscribers, is provided in which the CTX subscribers comprise mobile subscribers and wired subscribers. A message interface for the transmission of CTX-specific information is established between the mobile switching center allocated to the mobile subscribers and the fixed network switching center allocated to the wired CTX subscribers, and the control of the mobile switching center is supplemented by a control part for the CTX-specific mobile call processing.

Abstract: A device provided in a mobile phone for notifying the user of the receiving of a call signal, includes a vibrator having a rotor mounted in the body of the mobile phone to make a vibration tangibly sensed by the user when the call signal is received by the mobile phone, a battery pack detachably attached to the body to supply power to the mobile phone, and a protrusion formed on the outer surface of the battery pack at the weight center of the mobile phone. Thus, the mobile phone placed on a surface is rotated about the protrusion upon receiving the call signal.