Abstract: Provided is a semiconductor device with a reference voltage circuit including an enhancement type transistor having P-type polycrystalline silicon as a first gate electrode, and a depletion type transistor having N-type polycrystalline silicon as a second gate electrode, in which the enhancement type transistor has an impermeable film that is locally provided to cover the first gate electrode via an interlayer insulating film disposed on the first gate electrode, and a nitride film that has an opening portion which is provided larger than the first gate electrode and smaller than the impermeable film, and is provided to cover a periphery of the impermeable film, and the depletion type transistor has a nitride film that is directly provided on an interlayer insulating film disposed on the second gate electrode and covers the depletion type transistor without a gap.

Abstract: A radio base station which receives a first and a second communication channel from a radio communications device comprises a control circuit for detecting the reception quality of the first communication channel, conducting an inner-loop power control for controlling transmission power of the first communication channel from the radio communications device based on the reception quality and an inner-loop power control target value, and adding a power control offset to the inner-loop power control target value before starting a communication through the second communication channel.

Abstract: An active set control method for handover operation in a CDMA communications system in which propagation conditions of an uplink channel and a downlink channel for an access link of cell are different, provides that when a cell is deleted from the active set based on a request of a base station which has detected a degraded signal of the uplink channel, a predetermined period of time is to be counted for inhibiting addition of the same cell in the active set based on a request of a mobile terminal which has detected a satisfied signal of the downlink channel, thereby preventing the deletion and addition of the cell in the active set from successive operations in a short time.

Abstract: Disclosed is a wireless communication system in which a mobile station transmits a plurality of reference signals upon placing the reference signals in temporally spaced-apart relation in at least one of information transmission units wirelessly transmitted in conformity with a hopping period, and a base station receives an information transmission unit that has been transmitted from the mobile station and, if this information transmission unit is one that includes a plurality of the reference signals, obtains a phase fluctuation from the plurality of reference signals and obtains a frequency deviation from the phase fluctuation.

Abstract: Base stations (100-1 to 100-3) communicate with terminals (102-1 to 102-2), divides a used frequency into a plurality of frequency blocks, and assigns the divided frequency block to terminal (102-1 to 102-2), in which a position at which terminal (102-1 to 102-2) exists is determined, and if it is determined that terminal (102-1 to 102-2) exists at the edge of cell (101-1 to 101-3), the assigned frequency block is set as a cell edge frequency block that is to be dynamically assigned at the edge of cell (101-1 to 101-3). In addition, if the cell edge frequency block has already been assigned to another terminal, this cell edge frequency block is assigned to terminal (102-1 to 102-2).

Abstract: The present invention provides a radio network system including a mobile station that leads in determining whether handover can be executed or not, wherein the handover is for switching a handover origin radio base station to a handover destination radio base station, wherein the handover destination radio base station reserves resources required for the handover based on a handover request from the mobile station and information on the mobile station required for the handover, and establishes a user plane path for transferring user information between itself and the handover origin node B.

Abstract: Disclosed is a mobile terminal transmission scheduling method for a mobile communication system. In each cell of this system, adjustment regions are provided externally adjacent to a soft-hand-over region. A mobile terminal (MT), upon entering this adjustment region, transmits an adjustment region scheduling request to a radio network controller (RNC) via a base station (BS) to which the MT currently belongs. The RNC transmits a scheduling adjustment start request to this BS. Upon receiving this request, this BS moves to an adjustment scheduling operating state and adjusts a scheduling control signal internally generated in the BS. The MT, upon exiting this adjustment region, transmits an adjustment region scheduling release request to the RNC via a BS to which the MT currently belongs. The RNC transmits a scheduling adjustment end request to this BS. Upon receiving this end request, this BS returns to a normal scheduling operating state.

Abstract: Disclosed is a mobile terminal transmission scheduling method for use in a base station within a mobile communication network. This method is executed in the following process. A base station acquires position information and a speed of a mobile terminal. When the base station judges that the mobile terminal is within the cell and outside the specified region and also judges that the speed is large, the base station outputs a scheduling adjustment indication signal. The base station normally transmits to a mobile terminal a scheduling control signal as it is that is generated within the basestation. Further, when the scheduling adjustment indication signal is generated, the base station transmits to the mobile terminal an additional scheduling control signal for instructing the mobile terminal to change its transmission rate.

Abstract: An active set control method for handover operation in a CDMA communications system in which propagation conditions of an uplink channel and a downlink channel for an access link of cell are different, provides that when a cell is deleted from the active set based on a request of a base station which has detected a degraded signal of the uplink channel, a predetermined period of time is to be counted for inhibiting addition of the same cell in the active set based on a request of a mobile terminal which has detected a satisfied signal of the downlink channel, thereby preventing the deletion and addition of the cell in the active set from successive operations in a short time.

Abstract: Each base station measures the reception states of an uplink high-speed signal from mobile terminals and periodically reports the measurement results to a radio network controller (RNC). The RNC determines cells that are to be deleted from an active set based on the reception states (for example, the reception SIR) that are reported from each base station. The RNC transmits to one base station and mobile terminal a radio line release request for releasing the radio line of the uplink high-speed signal that has been set to a cell that has been determined as a cell to be deleted from the active set. The base station and mobile terminal that have received the radio line release request from the RNC each release the radio line, whereby the cells of other base stations are eliminated from the active set.

Abstract: A synchronization establishing and tracking circuit for a CDMA base station is composed of a first spreading code generator, a first correlator, a second spreading code generator, a second correlator, and a phase determining circuit. The first spreading code generator generates a first spreading code sequence. The first correlator calculates first correlation between the first spreading code sequence and a first quasi-coherent signal corresponding to a first received signal received by the CDMA base station. The second spreading code generator generates a second spreading code sequence. The second correlator calculates second correlation between the second spreading code sequence and a second quasi-coherent signal corresponding to a second received signal received by the CDMA base station. The phase determining circuit determines a first phase of the first spreading code sequence based on an added quasi-coherent signal to which the first and second quasi-coherent signals are added.

Abstract: A radio base station which receives a first and a second communication channel from a radio communications device comprises a control circuit for detecting the reception quality of the first communication channel, conducting an inner-loop power control for controlling transmission power of the first communication channel from the radio communications device based on the reception quality and an inner-loop power control target value, and adding a power control offset to the inner-loop power control target value before starting a communication through the second communication channel.

Abstract: A mobile broadcast communication system of the present invention includes a broadcast communication station configured to send, in response to a request from a mobile terminal, audio, video or similar broadcast communication data. At this instant, whether or not the receipt quality of the mobile terminal is higher than a reference value is determined. The transmission of the broadcast communication data is effected by assigning a single spread code to a single channel, so that the data can be sent even to a plurality of mobile stations via a single channel at high speed.

Abstract: A mobile broadcast communication system of the present invention includes a broadcast communication station configured to send, in response to a request from a mobile terminal, audio, video or similar broadcast communication data. At this instant, whether or not the receipt quality of the mobile terminal is higher than a reference value is determined. The transmission of the broadcast communication data is effected by assigning a single spread code to a single channel, so that the data can be sent even to a plurality of mobile stations via a single channel at high speed.

Abstract: A synchronization establishing and tracking circuit for a CDMA base station is composed of a first spreading code generator, a first correlator, a second spreading code generator, a second correlator, and a phase determining circuit. The first spreading code generator generates a first spreading code sequence. The first correlator calculates first correlation between the first spreading code sequence and a first quasi-coherent signal corresponding to a first received signal received by the CDMA base station. The second spreading code generator generates a second spreading code sequence. The second correlator calculates second correlation between the second spreading code sequence and a second quasi-coherent signal corresponding to a second received signal received by the CDMA base station. The phase determining circuit determines a first phase of the first spreading code sequence based on an added quasi-coherent signal to which the first and second quasi-coherent signals are added.

Abstract: A mobile communication termination controlling method for controlling each of a plurality of mobile stations to which a call is transmitted from a public telephone network connected to a base station, the mobile stations being connected to the base station with a radio circuit is disclosed, that comprises the steps of (a) registering a termination difficulty state to each of the mobile stations when it is predicted that the mobile station will not stably transmit and receive a radio wave, (b) causing a mobile station that has been registered in the termination difficulty state at step (a) and that has a call transmitted from the public telephone network to enter a termination difficulty mode, (c) determining whether or not termination control information has been unsuccessfully exchanged between the mobile station in the termination difficulty mode and the base station, (d) repeating a termination control of the unsuccessfully exchanged termination control information that has been determined at step (c) a pr

Abstract: In phase modulation of the quadrature signals of a multi-valued digital signal, when the signal state transition is .pi. [rad], the spectrum of a nonlinear amplifier extends beyond the transmission bandwidth, and the conversion distortion becomes conspicuous. A phase modulation apparatus includes a phase shifter (11) which receives a multi-valued digital signal, converts the digital signal into two quadrature signals such that a period for which the self phase shift amount of the digital signal on an orthogonal coordinate system becomes .pi./2 [rad] at the time of state transition of the digital signal is always obtained, and outputs the quadrature signals, a bandwidth limiting filter (12) which band-limits the outputs from the phase shifter (11), and a phase modulator (13) for phase-modulating the output from the bandwidth limiting filter (12). Since the state transition is .pi.

Abstract: At step S21, a residual amount judging section of abattery residual amount display circuit measures a battery voltage. If a mode transition is detected at step S22, the process returns to step S21 without executing the subsequent steps. If it is judged at step S23 that the operation mode is a reception-waiting mode, the process goes to step S24, where the battery amount judging section judges a battery residual amount by comparing the detected battery voltage with threshold values. If the operation mode is judged to be a transmission mode, the battery residual amount judging section determines a voltage drop during a transmission at step S25, and converts the voltage drop into a battery voltage of a reception waiting mode at step S26 by subtracting the voltage drop from a batter voltage obtained in a reception waiting mode immediately before the mode transition.

Abstract: A radio communication terminal station, includes a demodulator for receiving a digital modulation signal and generating a reproduction carrier wave and a reproduction clock signal, an oscillator having a frequency control function, an automatic frequency controller for controlling the frequency of an oscillation signal of the oscillator with reference to the reproduction carrier wave, a frequency divider for dividing the frequency of an output signal of the oscillator and outputting a reception clock signal and a transmission clock signal, a phase comparator for comparing the phase of the reception clock signal that is the output signal of the frequency divider with the phase of the reproduction clock signal and outputting a phase difference signal, and a frequency dividing controller for controlling the frequency dividing ratio of the frequency divider corresponding to the phase difference signal.

Abstract: A transmitter apparatus for a mobile satellite communication terminal comprises a Nyquist filter having input to it two series of orthogonal data and equalizing them for a waveform, an envelope equalizer equalizing the output of the filter so that the distance of an envelope (locus) on an orthogonal axis is always constant from the origin, a phase modulator receiving the output signals from the envelope equalizer and phase-modulating them, and a power amplifier receiving the output of the phase modulator, and power-amplifying it at a high-frequency band. Thus, it becomes possible to eliminate the effects of AM-PM conversion distortion in the power amplifier.