Abstract: In a transmission power control method, a base station apparatus and a communication terminal, transmission between the transmission side and the reception side can be preformed with an optimum transmission power.

Abstract: Radio communication is performed between a base station and a mobile communication apparatus including a speech signal processing unit, a codec unit, a radio unit, a power supply control unit and a main control unit. An intermittent reception ratio between a period of calls from the base station to the mobile communication apparatus and a period of intermittent reception effected by associated periodic supply of the operating power from the battery is set in an intermittent reception ratio setting unit implemented by a processor in a main control unit and a mode flag in a memory, in accordance with extended information items contained in announcement information from the base station. The intermittent reception ratio may alternatively be set by a terminal device connected to the mobile communication apparatus via a connection unit.

Abstract: A DSRC car-mounted equipment which automatically drives a receiver circuit only when it is necessary to suppress the consumption of an electric power. A DSRC car-mounted equipment comprises a receiver circuit 3 driven upon being supplied with an electric power from a battery 6A, a receiver circuit drive means 4 for driving said receiver circuit, and a drive condition judging means 10 for judging the drive conditions of said receiver circuit drive means, wherein said drive condition judging means includes vibration data detecting means 12, 15 for detecting the vibration data B, F of said vehicle, and vibration data judging means 14, 17 for comparing the vibration data of said vehicle with reference values Cb, Cf, and wherein when said vibration data satisfy predetermined conditions for said reference values, judgement signals Da, Df for driving said receiver circuit are output to said receiver circuit drive means.

Abstract: A system which dynamically adjusts the power of signals transmitted from a wireless base station over global channels to minimize spillover to other communication cells monitors the total transmit power of the base station and dynamically adjusts the global channel transmit power as a function of the total transmit power of the base station as measured at the base station.

Abstract: A system for directly comparing on a service quality basis a plurality of wireless network services includes a vehicle containing a plurality of phones for different wireless networks and a fixed location for receiving calls from or transmitting calls to the vehicle. A call is initiated at the vehicle or fixed location, and a series of preselected messages are alternately transmitted between the vehicle and the fixed end through each of the networks with each message being quality graded with voice recognition software or data comparison techniques so that quality grades for each network are provided which can be combined and compared in various ways. The vehicle also includes a global positioning satellite system so that the vehicle location and speed can be tagged to each transmitted message to compare the relative quality of the networks within specific portions of the geographical area covered by the vehicle.

Abstract: A manner by which to effectuate closed-loop power control in a two-way communication system. A switched-current, exponential DAC (digital-to-analog converter) is utilized to generate a reference signal responsive to detection of successive power control bits received by the communication device. The reference signal is step-wise exponentially related to previous values, thereby to cause a step-wise increase, or decrease, in the value of the reference signal. The reference signal is utilized to effectuate an increase or decrease in the power levels of signals generated by the communication device.

Abstract: A method for managing forward link power control within a code-division multiple access mobile telephone communication network is disclosed. A mobile telephone communication network constantly monitors for a frame erasure reported by a mobile telephone. In response to the detection of a frame erasure, the mobile telephone's digital gain assigned to the mobile telephone by the mobile telephone communication network is increased by a step-up value to close the forward link. This step-up value may be different each time depending on the speed and position of the mobile telephone. Afterwards, the digital gain is continuously reduced in an exponential manner until another frame erasure is reported.

Abstract: A method and a circuit for detecting transmission of a radio frequency (RF) signal and generating control signals to regulate the operation of a RF converter remotely located from a corresponding transmitter are disclosed. The method comprises the following steps: (a) sensing the direction of a RF signal flowing in an RF transmission line, at a location proximate of the RF converter; (b) generating a low-power RF signal in response to the sensed direction; and (c) transforming the low-power RF signal into a control signal to regulate the operation of the RF converter.

Abstract: For informing a user of a pager terminal for receiving message information attributed with a serial message number of the serial message numbers of missing message information, the pager terminal having a missing massage indicator comprises, a message status memory (17) prepared with a message reception table having a reception confirmation flag area and a reception failure flag area for each of possible serial message numbers. A logic `1` flag is set in the reception confirmation flag area corresponding to the serial message number N of the message lastly stored. When a message having a message number M is newly received, the numbers M and N are compared. When M.noteq.N+1, logic `1` flags are set in all the reception failure flag areas corresponding to the serial message numbers from N+1 to M-1 for indicating the reception failure of these messages.

Abstract: The object of the invention is a method and an arrangement for separating signals operating in the same channel. In the solution according to the invention, the signals to be transmitted are conditioned so that the receiver at the other end of the transmission route is able to separate an effective signal from an interference signal. The invention can be applied in the TDMA systems used in data communication cellular networks.

Abstract: A method for reducing the dynamic range required of an automatic gain control (AGC) circuit in a remote transceiver in 2-way communication between local and remote transceivers. By repeatedly transmitting a signal with successively increasing power from one transceiver until a response is received from the other transceiver, the dynamic range and hence complexity of the receiving circuit may be greatly reduced. The operating power of the remote transmitter can then be adjusted according to the level used by the local transmitter, thereby promoting the efficent use of the remote's power supply.

Abstract: A signal 101 from a transmitting station includes: an address 102 specific to a message receiving apparatus; a specific message 103 that is an advance notice indicating receipt of a large-volume message; and a message main body 105. The message receiving apparatus includes: a receiving section 11 that outputs a data string by demodulating the signal 101; a decoder 13 that subjects the data string to an error correcting process, converts the corrected data string into a message, and makes an address collation; an analyzer 14 that analyzes the message and outputs a control signal to a total control section 16 if the analyzed message is a specific message; a buffer 15 that stores a message main body; and the total control section 16 that stops a peripheral device section 17 in accordance with signals obtained from the decoder and the analyzer and controls display by sending a message in the buffer 15 to the peripheral device section 17.

Abstract: Power control apparatus and an associated method for a transmitting station operable in a TDMA communication system. The transmitting station includes transmitter branches for communicating communication signal bursts during selected time slots. Communication signal bursts transmitted upon adjacent time slots partially overlap so that a receiving station is able to extract information from a communication signal burst transmitted upon an adjacent time slot.

Abstract: A communication system having a radio master and a radio slave for communicating a communication signal and a control signal via a common channel is constructed by a receiver to receive a communication signal, a transmitter to transmit a control signal, and a limiter to limit an output of the signal received by the receiver for a period of time corresponding to a transmission of the control signal and a reception of a predetermined signal by the receiver. The limiter has a key to request the transmission of the control signal and limits the output of the reception signal in accordance with the key operation. The generation of an uncomfortable sound which is caused by a communication of the control signal can be prevented.

Abstract: An amplifier system (100) for transmitting wideband multicarrier communication signals in a satellite communication system uses wideband envelope elimination and restoration amplifiers (200). The system upconverts channelized IF signals to provide a wideband multicarrier RF output signal between 20 and 30 GHz having a bandwidth between 100 and 200 MHz.

Abstract: A method and apparatus for passband communication using direct conversion avoids 1/f and DC-offset noises by shaping the spectrum of the signal so that it has little energy near zero frequency. After the receiver frequency down-converts the signal to baseband, it filters frequencies in the neighborhood of zero prior to demodulation. Since the spectrum of the signal was shaped by a coder prior to transmission so that it has little energy content near zero frequency, the filtering at the receiver eliminates 1/f and DC-offset noise without reducing significantly the energy of the desired information signal. After the noise has been filtered, the receiver demodulates and decodes the signal to recover the information signal. The coding can be based upon broadening of the amplitude range or the frequency range to create the required spectrum shaping.

Abstract: A radio communications system such as a radio local area network including a base station and mobile stations. The radio communications system includes an intermittent power-on type mobile station for shifting automatically to a power-on state synchronously with a received timing of a beacon signal, with a fixed period of time after the beacon signal has been received being a data receive-ready period; and a base station for emanating a beacon signal to the intermittent power-on type mobile station and communicating with the intermittent power-on type mobile station by radio while the intermittent power-on type mobile station is controlled. The base station preferentially transmits data to a normal mobile station in a normally power-on state when the data to be transmitted to the intermittent power-on type mobile station exists during the data receive-ready period of the intermittent power-on type mobile station. The radio communications system can realize improved throughput and power-saving.

Abstract: A radio selective call receiver includes a synchronous data detector for detecting synchronous data for each unit of a series of a predetermined number of data formed by dividing the transmitted signal into a plurality of parts. A time counter performs time setting and produces time information. A time information comparator compares the synchronous data from the synchronous data detector with the time information from the time counter to calculate an error, and the time counter is corrected on the basis of the error output of the time information comparator. A display displays a time correction interval menu comprising a plurality of different time intervals, and switches enable the selection of a specific time interval, after the expiration of which the time information of the time counter is corrected on a regular basis. This arrangement enables a selection of one of the plurality of different time intervals, to change the time interval after which the time information of the time counter is corrected.

Abstract: A radio telephone for use in wireless telecommunication has a transmitter/receiver unit (4), a control unit (5), a first antenna (1), the properties of which are optimized for use in stand-by mode, and a second antenna (2), the properties of which are optimized for use during ongoing calls, said second antenna being electrically engageable and disengageable with the transmitter/receiver unit. The radio telephone further has an antenna switch (3), which is arranged to operatively connect the transmitter/receiver unit (4) to either the first antenna (1) or the second antenna (2), said antenna switch supplying the control unit (5) with control signals (7) in response to at least the electrical engagement status of the second antenna. The control unit prevents ingoing as well as outgoing calls from being established, as long as the second antenna according to said control signals is indicated to be electrically disengaged.

Abstract: A method and apparatus of providing active entertainment for persons waiting for service in which such persons are provided with an electronic pager assembly for notifying when service is available includes an electronically controllable pager assembly having a controllable screen display which is programmed with information likely to be desirable to a person holding the pager. A set of instructions enabling a person to access the information programmed in the pager assembly is printed on the assembly. The pager notification capability functions regardless of whether the information display is or is not active.

Abstract: A cell-site base station apparatus comprises an array of diversity antennas for receiving multipath components of a mobile-transmitted signal. Receivers, connected to the antennas, produce strength indication signals and demodulated signals. For transmission of a control signal from the cell-site to a mobile station, a variable gain transmitter is coupled to one of the antennas and the control signal is sent at a first power level. When a connection is established for the mobile station, the strength indication signals from the receivers are examined to detect a highest strength value and one of the antennas is selected at which the multipath component of the highest strength value is arriving. The transmitter is then switched to the selected antenna for transmitting traffic signals and the gain of the transmitter is set to a second power level lower than the first power level to compensate for the transmit diversity gain of the selected antenna.

Abstract: Provided is an information transmitting apparatus for transmitting information to an external receiving apparatus by means of a radio wave comprising: a control information attaching device for attaching control information representing a control processing method on the receiving apparatus side of the information to the information to be transmitted; and a transmitting device for transmitting information to which the control information is attached. Further provided is an information receiving apparatus for receiving and displaying transmitted information comprising: a receiving device for receiving the transmitted information; a display device for displaying the received information; and information processing device operating, when control information representing a control processing method of the received information is attached to the received information, to execute information processing corresponding to the control information.

Abstract: A method and system for predistorting a signal before transmission of the signal to compensate for nonlinearities introduced when the signal is transmitted to a receiver. A signal received on a first frequency is evaluated at a receiver to determine whether the received signal includes nonlinearities without comparing the received signal to the original signal or a pilot tone. The nonlinearity data that result from the evaluation are transmitted back to the originator of the signal on a second frequency where the nonlinearity data are used to predistort signals before transmission therefrom. Communication of the nonlinearity data between transmitter and receiver at each site is through a reverse channel which is further controlled by a serial line.

Abstract: A facsimile communication control method is provided for a mobile communication system whereby a sending-side facsimile device capable of sending and receiving facsimile signals does not discontinue a telephone call despite completion of facsimile communication, and a receiving-side facsimile device capable of sending and receiving facsimile signals discontinues a telephone call upon completion of facsimile communication.

Abstract: A mobile radio unit receives a time division multiplexed signal and detects the received signal strength of the time division multiplexed signal. An automatic gain control circuit automatically gain controls the degree of amplification of the received signal based on an amplification coefficient controlled by a control circuit and an detection result of a detection circuit, where the amplification coefficient showing follow-up ability of automatic gain control to the received signal strength is variable.

Abstract: A time-synchronous communication system comprises: fixed stations having distance measuring/time reference synchronization and maintaining unit, receiving/processing unit, transmitting/processing unit, and communication data processing management unit; mobile stations having distance measuring/time reference synchronization and maintaining unit, transmitting/processing unit, receiving/processing unit, and communication data processing management unit; and relay stations having distance measuring radio wave transmitting/processing unit, time reference synchronization and maintaining unit, and radio wave relay unit for relaying transmission radio waves from the fixed stations and the mobile station.

Abstract: A digitally trunked radio repeater system provides substantial improvements in timeliness and reliability. The mobile radio transceivers transmit channel requests on the control channel at 9600 bps. The mobile transceiver switches to a working channel in response to an assignment message received on the control channel. Message and transmission trunking capabilities are both present so as to maximize working channel usage without compromising channel access for high priority communications. Radios select between message and transmission trunking based on over-the-air signaling. During transmission trunking, called and calling receivers return to the control channel after each transmission (and called transceivers may be inhibited from transmitting) but grant higher priority to calls from the other transceivers being communicated with to ensure continuity over an entire conversation.

Abstract: A system and method for monitoring and managing the loading conditions in a CDMA wireless communication system. The system comprises a load monitoring device such as a CDMA mobile station connected to a data logging and processing device such as a diagnostic monitor. The monitoring device is placed within the service area of a base station. The monitoring device periodically initiates a call, is assigned to a traffic channel normally, and logs a power control parameter such as mobile station transmit power or the number of closed-loop power control commands received per unit time. From this information, the load monitoring device can infer the real-time traffic loading conditions of the base station. If the loading of the system exceeds a predetermined threshold, an alarm may be sent to the system management center in order to take some action to limit additional loading on the base station.

Abstract: A measuring unit which is not easily accessible often has a power source which supplies power to the elements for the measuring operation, more particularly, the conversion of an analog measured signal into digital measured data, and for storage thereof, as required. These measured data of a measuring unit are transmitted to a base station without any contact being made the moment this base station is brought into the neighborhood of the measuring unit and transmits a signal. For a minimum load on the power source power from the power source is not supplied to the transmitter for the transmission of measured data from the measuring unit to the base station. Instead, a signal transmitted by the base station provides transmission power. In the measuring unit this signal provides a voltage for feeding the transmitter.

Abstract: Real-time, multi-purpose advisories that inform users of roadways on upcoming situations, require frequent gathering and interpreting of information gleaned from road systems, and then feedingback information by means of repeated, spoken descriptives pertinent to each driver's location and heading. A system that provides all this, plus supports interactive communications between specific vehicles and a control center for purposes of describing roadway incidents, for the dispatch of emergency services; to request aid if stranded; to request destination directions; to receive destination-specific alternate-route advisories; etc., is described by the invention. Communication system simplification, essential to system practicality, is realized by time compressed, digitized spoken messages that flow thru single frequency, unidirectional repeaters, each message representing about 30 seconds of spoken descriptive advisory compressed into less than one second.

Abstract: A conventional billboard for displaying a visual message is combined with a communication system for enabling a message related to the message displayed by the billboard to be transmitted from the billboard to passengers of automotive vehicles driving by said billboard. The communication system includes a transmitter located at the billboard and connected to an external telephone line. A telephone unit, disposed at a remote business office, supplies the related message over the telephone line to the transmitter. Receivers, located in individual automotive vehicles, receive the transmitted message. The transmitter includes a recorder for recording the related message received from the telephone unit and a control unit for controlling recording and playback of that message.

Abstract: A receiving apparatus having an ID number memory unit to which any one of the different ID numbers of command signals received from a plurality of transmitters can be referred, wherein the signal received from one of the transmitters and temporarily stored in a buffer memory is compared one by one with ID numbers in the ID number memory unit before being fed into a central processing unit and wherein there is provided a timer T which is set when the received ID number has been identified by the ID number memory unit and used for inhibiting the next ID number from being referred thereto for a predetermined period of time.

Abstract: In a mobile communications system wherein the transmission form changes in the course of the signal, high quality transmission of change information relating to the transmission form is obtained. To achieve this, information giving advance notice of a change is transmitted prior to transmitting the change information relating to the transmission form. Even if a situation arises in which transmitted information has not been conveyed without error at a scheduled change time that was notified in advance, it is possible to resolve this situation by referring to the information giving advance notice of the change. This enables faulty paging and other defects resulting from erroneous changes of transmission form to be reduced.

Abstract: The pair of radio communication apparatuses of this invention on a transmitter side and a receiver side conduct data transmission and receiving through radio communication by a space diversity method where a plurality of antennas are switched therebetween, wherein the radio communication apparatus on the transmitter side includes a transmission circuit for conducting data transmission and a transmitting antenna switch circuit for selecting a transmitting antenna among a plurality of transmitting antennas for transmitting radio waves and connecting the selected transmitting antenna to the transmission circuit, and the radio communication apparatus on the receiver side includes a receiving circuit for conducting data receiving and a receiving antenna switch circuit for selecting a receiving antenna among a plurality of receiving antennas on the receiver side the radio waves and connecting the selected receiving antenna to the receiving circuit.

Abstract: A transmission power control unit 14 receives from transceivers 11, 12 and 13 transmission power control signals which are sent by mobile terminals and contain information on the extent to which the transmission power level is to be raised or lowered, and calculates information on the level of transmission power at which transmission should take place on each channel, i.e. transmission power control signals P1, P2, . . . , PN. It further calculates the sum of the transmission power control signals P1, P2, . . . , PN, checks whether or not that sum surpasses a prescribed value and, if it does, corrects the transmission power control signals P1, P2, . . . , PN. The transmission power control unit 14 controls the transmission power levels of the transceivers 11, 12 and 13 according to the corrected values.

Abstract: A base station-based communications system provides radio communication with battery-operated, portable radios, each radio including predetermined radio operating parameters corresponding to particular radio operating conditions. Each portable radio determines for itself one or more current radio operating condition(s), and based thereon, adjusts one or more radio operating parameters.

Abstract: A method for reducing the dynamic range required of a receiver circuit in a remote transceiver in 2-way communication between local and remote transceivers. By repeatedly transmitting a signal with successively increasing power from one transceiver until a response is received from the other transceiver, the dynamic range and hence complexity of the receiving circuit may be greatly reduced. The operating power of the remote transmitter can then be adjusted according to the level used by the local transmitter, thereby promoting the efficent use of the remote's power supply.

Abstract: A communications system includes apparatus for generating a succession of time message signals, a central station having a transmitter for transmitting the time message signals, at least a first receiver for receiving the time message signals and timer circuits for determining the real time of receipt of each time message signal. Each time message signal is representative of the real time of receipt, by the first receiver, of a preceding time message. The first receiver includes a clock for providing the first receiver with an internal time signal. The clock is reset upon receipt of a first time message signal and is advanced, upon receipt of a subsequent time message signal, by the real time indicated by the subsequent time message signal.

Abstract: The present invention provides a device (200, 300), system (400, 500) and method for real-time streaming of a multimedia file stored in a remote server over a packet network to a multimedia client connected to the same network via a low-speed access link such as an analog telephone line. The invention operates to provide significantly improved QoS with respect to both quality and delay.

Abstract: A communication unit (100) for operation in a communication system (600). The communication system (600) includes a plurality of communication units (100) and a control resource (300). The communication unit (100) includes a transmitter (118) for transmitting a signal to the control resource (300) requesting programming information using a bootstrap mode of operation. The communication unit (100) also includes a receiver (106) for receiving programming information sent by the control resource (300). The communication unit (100) further includes a controller (112) coupled to the transmitter (118) and the receiver (106) for programming the communication unit (100) using the received programming information prior to receiving authorization for using the communication unit.

Abstract: Status changes made on first pager (130 and 530) are wirelessly communicated to an infrastructure (110 and 510) which communicates the status changes to other pagers (150 and 550) so that the other pagers make corresponding status changes. Thus, a user's status changes made on one pager are automatically made on the user's other pagers. Status changes include changes to received messages, alarm times, alert thresholds, and key word alerts.

Abstract: A base station-based communications system provides radio communication with battery-operated, portable radios, each radio including predetermined radio operating parameters corresponding to particular radio operating conditions. Each portable radio determines for itself one or more current radio operating condition(s), and based thereon, adjusts one or more radio operating parameters.

Abstract: The invention involves a method of transmitting a control signal that is synchronized in time with a radio program signal. The control signal may be used, for example, in a receiver to restore dynamic range reduction that occurred at the transmitter. The method includes the steps of forming a first supplemented signal by inserting the control signal and a first time-reference signal into a data stream of a radio data signal such as an RDS signal. A second supplemented signal is formed by adding a second time-reference signal to the radio program signal. The first and second time-reference signals are correlated in time. The first and second supplemented signals are transmitted.

Abstract: Transmission power of a wireless terminal for transmitting a signal representing information of a particular information class to a base station capable of receiving signals for a plurality of information classes is determined based on a probability measure indicating received signal outage durations that would likely occur over a time interval. Moreover, the transmission power is determined to achieve probable signal outage durations according to the measure that are tolerable for the particular information class to be transmitted. The probability measure is further based on an enhanced characterization of a variation and mean of the detected signal interference magnitude over a time interval.

Abstract: A communication apparatus comprising a detector for detecting a standard DTMF signal when a clock of a predetermined frequency is supplied, an operating unit for executing an operation such as display or communication according to a detection output of the detector to which a clock other than the predetermined frequency was supplied, and a supply unit for supplying the clock other than the predetermined frequency to the detector.

Abstract: A fuzzy-logic spread-spectrum adaptive power control system comprising a base station and a plurality of remote units. The base station receives a spread-spectrum signal, and samples the despread spread-spectrum signal at a peak correlation time of the data channel, and at a non-peak correlation time of the data channel. This in turn generates a signal level and a noise level, respectively. A signal-to-noise ratio calculator generates a signal-to-noise ratio from the signal level and the noise level. A fuzzy-logic controller compares the signal-to-noise ratio to a set of predetermined thresholds, and using a state machine, generates a control signal which is thereby transmitted to the remote unit, indicating the amount by which to increase or decrease transmitted power. Each remote unit demodulates the control signal, and a transmitter controller adjusts a power level of the remote-unit spread-spectrum transmitter.

Abstract: In known processes for controlling a receiver-side appliance, data concerning the identification signal of a program being received are derived automatically from the identification signal transmitted together with the program. The aim of the invention is to allow a program received after the program currently being received to be programmed in a receiver-side appliance without having to input manually individual essential data of the identification signal. According to the present invention, a first identification signal received when a receiver-side control device is activated and a predetermined number of subsequent, different identification signals are counted together and stored automatically in the data contained in the identification signals concerning the identification signal received when the predetermined number is reached and/or the previously received identification signal and the first identification signal.

Abstract: The present invention comprises a method for compressing a plurality of voice signals within a voice communication resource (see FIG. 6) having a given bandwidth within a voice communication system (100). The method comprises the steps of subchanneling the voice communication resource into a plurality of subchannels (441, 442, 443), placing a pair of the plurality of voice signals (401, 402) on a subchannel (441); modulating the pair of the plurality of voice signals (401, 402) about a pilot signal (581) within the subchannel (441) using single sideband modulation; and compressing the time of each of the voice signals (401, 402) within the plurality of subchannels (441, 442, 443), wherein these step provide a compressed voice signal.

Abstract: A radio system, including a fixed radio network having base stations and mobile radio stations. Each mobile station with no ongoing call normally monitors messages transmitted by a base station on a control channel in order to enable a fast call set-up. The user may select for a mobile station a normal operating mode, in which messages on the control channel are monitored continuously, as well as an alternative operating mode, in which the mobile station may stop monitoring the control channel at suitable moments for a time of absence known by the radio network, during which time the radio network does not try to send messages to the mobile station.

Abstract: A system and method of displaying incoming pager messages on a receiver using infrared signals. The paging device includes a receiver for receiving paging signals including paged information. The output signal from the receiver is supplied to a baseband processor where it is converted into a digital signal, under the control of a processor. If the thus digitized signal is determined to be the selecting signal for the particular paging receiver, the digital signal is then preferably sent directly to a protocol translator, where it is converted into a signal having an infrared protocol. After processing in the protocol translator, the signal is then sent to a transmitter and transmitted as an infrared signal. The infrared signal is then received in a light-receiving element in a receiver where it is thereafter decoded by a protocol decoder in accordance with instructions contained in a memory connected thereto to retrieve the paging signal or paged message.