Abstract: The present invention relates to an idea in which, for example, an operation for limiting a function of a communication terminal apparatus such as a mobile telephone terminal or the like functions preferably by using a wireless communication. In the present invention, a communication system which includes a communication terminal apparatus and a wireless key apparatus and in which a wireless communication is possible is constituted by a predetermined wireless communication system which at least includes a first communication mode for attempting a wireless connection in a first period in order to carry out a wireless communication between the communication terminal apparatus and the wireless key apparatus and a second communication mode for carrying out a wireless communication between the communication terminal apparatus and the wireless key apparatus in a second period longer than that of the connection mode in case of the wireless connected state.

Abstract: A portable terminal monitors a signal level of a short-range wireless signal from a wireless communication apparatus. If the signal level drops so low that a state of connection for short-range wireless communications cannot be maintained between the two apparatuses, use of predetermined functions of the portable terminal is limited. A short-range wireless communication facility of the portable terminal and the wireless communication apparatus move into a particular operation mode if communications do not occur therebetween at least for a predetermined time period. In monitoring the signal level of the wireless signal from the wireless communication apparatus in the particular operation mode, the portable terminal reduces a response speed at which to detect a signal level change.

Abstract: A head set apparatus capable of a wireless communication by a predetermined wireless communication system, wherein the predetermined wireless communication system includes at least a first communication mode which enables a data transfer with a partner apparatus to be communicated and a second communication mode for carrying out a wireless communication with the partner apparatus with a period shorter than that of the communication in the first communication mode while the wireless connected state remains; and the head set apparatus includes communication means for carrying out a wireless communication by the predetermined wireless communication system and control means for making the head set function as a head set when the communication state in the communication means is in the first communication mode and for making the head set function as a wireless key for security when the communication state is in the second communication.

Abstract: In a case when a mode relating to a function limitation of the communication terminal apparatus or a notification mode relating to that function limitation is set in response to the communication state between the communication terminal apparatus 10 and the wireless key apparatus 50, the communication terminal apparatus and the wireless key apparatus include judgment means for judging or presuming the wireless communication state or the wireless communication distance in the communication circuit, the communication terminal apparatus and the wireless key apparatus are wireless-connected, and in a case when a communication state for carrying out a wireless communication intermittently is set in each communication circuit and there is judgment or presumption of a predetermined state in the judgment means in a state in which the wireless connection is maintained, the mode setting relating to the function limitation or the notification mode setting relating to the function limitation is to be changed.

Abstract: According to the present invention makes, even if two of mobile communication terminal apparatuses such as a wireless key apparatus and a mobile telephone terminal apparatus or the like are utilized in various possessing states, it is made possible to maintain a stable distance detection accuracy. In a communication apparatus in which A distance to a connection partner terminal is detected according to a certain parameter and in a case when the distance exceeds a predetermined value, a function limitation or notification to a user is carried out, it is identified that the two of the mobile communication terminals lie in a predetermined appropriate distance according to a manual or automatic method and the proper distance identification information and further receiving state and transmission power at that time if they are necessary are communicated mutually and a parameter used for a distance detection is adjusted.

Abstract: In a communication where a retransmission is attained based on a Hybrid-ARQ (Automatic repeat ReQuest) system, retransmission having no gain is reduced, and improvement of the transmission efficiency is intended. A mode determining unit 111 of a base station carries out calculation to obtain a received signal quality difference information indicative of a difference between a received signal quality at the current stage and that of a past stage at a terminal, and supplies to a control unit 112. The control unit 112 controls a power setting unit 113 based on the received signal quality difference information supplied from the mode determining unit 111, and thus a transmission power of a signal transmitted from an adaptive coding and modulation unit 13 can be controlled. The present invention can be applied to a base station of a portable telephone communication network, for example.

Abstract: A method and apparatus is disclosed by which, in communication wherein a pilot channel for a pilot signal and an estimation object channel have different bandwidths, the channel quality of the estimation object channel can be estimated accurately based on the pilot signal. A despreading section separates data of the object channel and the pilot signal of the pilot channel. A channel estimation section determines a channel estimation value based on the pilot signal. A pilot channel quality estimation section produces signal and noise levels of the pilot channel based on the channel estimation value and the pilot signal. A low frequency noise component estimation section produces a low frequency component of pilot signal noise. A data channel quality conversion section determines the data channel quality based on the outputs of the pilot channel quality estimation section and the low frequency noise component estimation section.

Abstract: Disclosed is a wireless communication system wherein frame data is encoded with an outer code and then divided into predetermined number of blocks which are encoded with an inner code into transmission data which a receiver receives by wireless In the receiver, a decoder decodes the received transmission data in accordance with the inner code, a retransmission order determining unit determines whether or not to perform a retransmission order in units of blocks based on the likelihood information (decoded soft-decision value). At this time, the retransmission order determining unit inhibits the retransmission order for the block if the number of inner-code errors in a frame consisting of predetermined number of blocks stays within a limit of what the outer code can correct at a decoder and determines that a retransmission is necessary if the number of inner-code errors in the frame exceeds the limit.

Abstract: The mobile communication terminal of the present invention comprises an amplitude regulator 3 regulating the amplitudes of signals of the DPDCH, DPCCH, and HS-DPCCH, a transmission-power controller 17 controlling the power-distribution ratio for the adjustment of transmission power of the individual transmission channels, and a priority-channel selector 18 choosing a priority channel from among the individual transmission channels. If the total transmission power of the individual transmission channels is going to exceed the maximum transmission power, the transmission-power controller 17 determines the power-distribution ratio among the individual transmission channels by adjusting the transmission power of the priority transmission channel to a power level demanded by a base station on the one hand and adjusting the transmission power of the non-priority channel so as to confine the total transmission power to the maximum transmission power on the other hand.

Abstract: A channel monitor detects execution data quantities of first and second receiving circuits 3 and 4 which process audio and other line switching data or packet data transmitted from a plurality of base stations. Antenna weight values calculated by an antenna weight calculator 10 and supplied to the receiving circuits 3 and 4 are variably controlled on the basis of the execution data quantities of the receiving circuits. Consequently, it becomes possible to optimize the antenna weight values used for processing the data in the receiving circuits 3 and 4, hence improving the reception quality of a terminal device.

Abstract: In the mobile terminal, the reception quality estimating unit measures a reception quality, and at least one of the data buffer monitoring unit and the transmission power monitoring unit measures a data transmission capability. Based on the measured reception quality and data transmission capability, the terminal determines a transmission mode to be used, and reports it to the base station. The base station determines the transmission mode to be practically used in accordance with the reported transmission mode, and notifies it to the mobile terminal. The base station transmits data according to the determined transmission mode, and the mobile terminal receives data according to the notified transmission mode. Thereby, the radio communication system determines the transmission mode in consideration for not only the reception quality, but also the deficiency in the data transmission capability of the terminal.

Abstract: Radio resources are saved, and power consumption is reduced. A base station 101 carries out training for obtaining correlation information that correlates the reception quality of a packet channel transmitted from a terminal 102 and the transmission power of an associated channel, and based on the correlation information, uses the transmission power of the associated channel to obtain a predicted value of the reception quality of the packet channel, and controls the transmission of data through the packet channel based on that predicted value. In addition, the base station 101 transmits through the associated channel transmission control information for controlling the transmission of the reception quality of the packet channel by the terminal 102. The terminal 102 controls the transmission of the reception quality of the packet channel based on the transmission control information included in the data of the associated channel transmitted from the base station 101.

Abstract: Radio resources are saved. The base station 101 determines a possibility of transmitting data to the terminal 102, and transmits the indicator indicating the possibility of transmitting the data to the terminal 102. The terminal 102 generates a mode request message for determining a coding rate and a modulation system at the base station 101, and sets a transmission frequency of the mode request message based on the indicator transmitted from the base station 101. Accordingly, the mode request message is transmitted from the terminal 102 to the base station 101 at the determined transmission frequency.

Abstract: A receiving apparatus eliminating the need for performing at all times a function provided for a mode (64QAM) that is most susceptible to deterioration in accuracy in adaptive modulation communication. In a spread spectrum communication system according to the present invention, a control unit (104) reads a demodulating method from a control signal specifying the demodulating method (QPSK, 16-QAM, or 64-QAM), and on the basis of the read demodulating method, the control unit controls a sampling rate of an A/D conversion unit (111) and a despreading unit (102), a number of pilot symbols used by a propagation path estimating unit (106), and a number of pilot symbols despread by the despreading unit (102). Thereby, when the demodulating method is other than 64-QAM, the sampling rate and the like adjusted to QPSK or 16-QAM can be set, and thus the function provided for 64-QAM does not need to be performed at all times.

Abstract: A communication system to which can be applied site diversity. In this site diversity, different transmitting stations are not synchronized with one another, and signals from plural transmitting stations are received simultaneously. The timing shift produced when signals from plural transmitting stations are received simultaneously is received by a receiving side (S101). When the timing shift has exceeded the allowable range, the communication with the transmitting station is transiently halted (S102 to S106) and, after adjusting the timing on the transmitting side, communication is re-started (S107 to S112) so that the signal reception timings from different base stations will be within an allowable range at all times.

Abstract: The present invention relates to an information processing apparatus and a communication apparatus for accurately recognizing at the base station the current receiving quality of the mobile terminals for improving the throughput of the base station. A mobile terminal 61 determines its own receiving quality based on the signal received from the base station 62 for generating the receiving quality message indicating the receiving quality and generates the power control information requesting the transmission power of the base station 62. The receiving quality message is transmitted at a frame rate and power control information is transmitted at the slot rate to the base station 62. Based on both the receiving quality message and power control information, the base station 62 estimates the current receiving quality of the mobile terminal 61 and adaptive modulation and coding is performed based on the estimated value. The present invention may be applied to cellular phones and base stations.

Abstract: A method and a system for controlling transmission power which recover a target SIR calculated on a terminal station side from a state where it has become excessively large to a state where the target SIR is normal as quickly as possible are provided.

Abstract: A hand-off mobile communication system dispensing execution of complex processes at both base station and terminal side, and reducing interference originated when monitoring a neighboring base station. A radio communication terminal is provided comprising a receiver unit using a transmission suspending period generated as a result of the reception of compressed data frames, and yet, based on such function for measuring actual intensity of data signal from neighboring base stations using different frequencies and also, based on the measured result, controls a transmitting and/or receiving means to switch a base station transmitting and/or receiving actual data. Also, there is provide a CPU detecting that the radio terminal remains in a non-mobile condition and then transmits the data signal indicating this condition to a switched base station.

Abstract: A transmission power controller includes a transmission amplifier located in a first station and having an adjustable gain. The transmission amplifier controls the power transmitted from the first station to a second station in accordance with a power control information signal transmitted from the second station. The transmission power controller comprises a power control information extracting circuit, and up/down decision circuit, and a filter interposed between the up/down decision circuit and the transmission amplifier. The filter extracts low frequency band components from sequential output signals of the up/down decision circuit, generates command signals, and applies the command signals to the transmission amplifier to control the gain of the transmission amplifier.

Abstract: For full performance of the function of the closed-loop type transmitting antenna diversity for a radiocommunication, a radiocommunication system includes a radiocommunication terminal 10 and a base station 200. The radio terminal 10 is provided with an operation unit 17 to supply or select a request for application of the closed-loop type transmitting antenna diversity to the radiocommunication and a CPU 16 which sends to the base station 200 the diversity application request, when supplied as input by operating the operation unit 17, via an antenna 11. The base station 200 will make a radiocommunication with the closed-loop type transmitting antenna diversity being applied to the radiocommunication based on the received diversity application request from the radio terminal 10.