Abstract: A base station which uses either one of a plurality of component carriers individually or uses an aggregate carrier which is an aggregate of the above-mentioned plurality of component carriers to carry out radio communications with a mobile terminal corresponding to the above-mentioned component carrier and also carry out radio communications with a mobile terminal corresponding to the above-mentioned aggregate carrier is provided. The base station notifies a bandwidth of an aggregate carrier which is an aggregate of all of the above-mentioned component carriers, as a bandwidth which the above-mentioned base station uses, to the mobile terminal corresponding to the above-mentioned aggregate carrier. As a result, while an improvement in the transmission rate is provided according to the aggregate carrier, the base station can also support an operation of a mobile terminal corresponding to a component carrier.

Abstract: There is a problem that when a closed subscriber group (CSG) cell (1303) available to subscribers is installed in a macro cell area (1301), communication cannot be performed due to the interference between a macro cell (1302) and the CSG cell (1303) in an area (1304) thereof.

Abstract: In a communication system including a specified subscriber cell which allows a specific mobile terminal to use the specified subscriber cell, and an unspecified user cell which an unspecified mobile terminal can use, in which each mobile terminal receives cell identification information assigned to each communication cell and makes a cell selection, identification information for identifying the CSG cell operating in an open access mode is included in the cell identification information.

Abstract: A closed subscriber group (CSG) cell is a cell that allows use of subscribers. In order to receive the service by the CSG cell, a CSG-ID is required to be notified to a user equipment, which cannot be obtained in a situation outside the reach of radio waves from a non-CSG cell. In a mobile communication system including base stations respectively provided to a CSG cell and a non-CSG cell in which access is made to the CSG cell with the use of a CSG-ID issued in a case where use of the CSG cell is allowed, the base station provided in the CSG cell refers to the notified identification information of a user equipment and then transmits a tracking area update request from the user equipment to a core network, and the core network determines whether the user equipment is allowed to use the CSG cell and, in the case where the use is allowed, transmits a signal for allowing assignment of radio resources to the user equipment and the CSG-ID. The user equipment accesses the CSG cell with the use of the CSG-ID.

Abstract: Since OFDM (Orthogonal Frequency Division Multiplexing), which is a downlink access scheme used for an LTE (Long Term Evolution) communication system, is weak at interference, it is preferable that the number of base stations for transmitting the same E-MBMS (Evolved Multimedia Broadcast Multicast Service) data be not excessive. Thus, the mobile terminal performs: processing of obtaining measurement quality values by measuring reception quality of each base station; processing of deciding on whether the measurement quality value of a serving base station exceeds a certain receiving level; processing of adding measurement quality values of other base stations to the measurement quality value of the serving base station until the sum exceeds the certain receiving level; and processing of notifying the serving base station of the serving base station and other base stations as candidates for an active set for E-MBMS.

Abstract: Since OFDM (Orthogonal Frequency Division Multiplexing), which is a downlink access scheme used for an LTE (Long Term Evolution) communication system, is weak at interference, it is preferable that the number of base stations for transmitting the same E-MBMS (Evolved Multimedia Broadcast Multicast Service) data be not excessive. Thus, the mobile terminal performs: processing of obtaining measurement quality values by measuring reception quality of each base station; processing of deciding on whether the measurement quality value of a serving base station exceeds a certain receiving level; processing of adding measurement quality values of other base stations to the measurement quality value of the serving base station until the sum exceeds the certain receiving level; and processing of notifying the serving base station of the serving base station and other base stations as candidates for an active set for E-MBMS.

Abstract: Frequencies are allocated in a wireless network, wherein the network includes a set of macrocells and a set of femtocells, and wherein each macrocell includes a base station (BS) and each femtocell includes a femtocell base station. A frequency spectrum is assigned to the network. The frequency spectrum is partitioned into bands of frequencies. The bands of frequencies are allocated to the set of BS for communicating with user equipments (UE) in the set of macro cells, and guard bands of frequencies, within which no data are transmitted between the UE and the macro cell BS. The guard bands are assigned to the set of femtocell base station for communicating with UE in the set of femtocells.

Abstract: A communication system has three types of cells including, in addition to an MBMS dedicated cell, a unicast cell to and from which a mobile terminal can transmit and receive individual communication data, and a unicast/MBMS-mixed cell which can provide both a service provided by the unicast cell and a service provided by the MBMS dedicated cell. While receiving the broadcast type data transmitted from the MBMS dedicated cell, the mobile terminal makes a notification of an MBMS receiving state via the unicast cell or the unicast/MBMS-mixed cell to transmit information for identifying the MBMS dedicated cell, and the communication system transmits a paging signal to the mobile terminal currently receiving the broadcast type data transmitted from the MBMS dedicated cell on the basis of a tracking area (Tracking Area) in which the mobile terminal is tracked, the tracking area being determined on the basis of the information transmitted.

Abstract: A mobile terminal monitors a candidate set (Candidate Set) of L1/L2 control information. However, when a base station carries out signaling of a candidate set to each of all mobile terminals, the load on the base station from the viewpoint of radio resources becomes large. Furthermore, the amount of processing in performing a blind detection of each mobile terminal also increases. Therefore, the base station carries out a process of performing grouping of the above-mentioned mobile terminal which is a destination of transmission of the above-mentioned L1/L2 control signal, a process of allocating an L1/L2 control signal to be transmitted to a predetermined mobile terminal to the control channel elements included in a group to which the predetermined mobile terminal is belonging on the basis of attribution information about the mobile terminal.

Abstract: In a communications system including a base station capable of altering a frequency bandwidth which is used for transmitting broadcast data for providing point-to-multipoint broadcasting communications service and which is used for transmitting individual communications data for providing point-to-point individual communications service, and a mobile terminal capable of altering a receivable bandwidth which is used for receiving at least the broadcast data and the individual communications data transmitted from the base station, decision processing of making a decision as to whether the mobile terminal can receive reception-desired content it desires to receive among contents provided by the broadcasting communications service is executed in accordance with a frequency occupying bandwidth used for transmitting the reception-desired content. Thus, the mobile terminal becomes able to make a decision as to whether it can receive particular E-MBMS content considering its own UE position.

Abstract: In accordance with the present invention, in a case of using persistent scheduling, when detecting a transition from a talk state to a silent state, resources to be allocated during a silent state are allocated to a channel exclusive for silent period, and the resources which have been allocated to a mobile terminal during the talk spurt are released. Therefore, the useless allocation of resources can be reduced, and the throughput of the system can be improved.

Abstract: In a communications system which complies with LTE including a base station 2 which transmits data by using an OFDM (Orthogonal Frequency Division Multiplexing) method as a downlink access method, and a mobile terminal 3, in a case in which an uplink scheduling request signal SR is transmitted by using an S-RACH when an Ack/Nack signal is being transmitted by using an Ack/Nack exclusive channel, the transmission of the Ack/Nack signal is stopped while the uplink scheduling request signal SR is transmitted.

Abstract: A mobile terminal judges whether or not the mobile terminal is able to make a transition to a DTX period during Active, and, when judging that the mobile terminal is able to make a transition to a DTX period during Active, notifies a base station to that effect. If the base station judges that the mobile terminal is able to make a transition to a DRX period during Active when triggered by the notification from the mobile terminal, the base station temporarily stops supply of electric power to the data transmission processing units and the data reception processing units of the mobile terminal.

Abstract: Since OFDM (Orthogonal Frequency Division Multiplexing), which is a downlink access scheme used for an LTE (Long Term Evolution) communication system, is weak at interference, it is preferable that the number of base stations for transmitting the same E-MBMS (Evolved Multimedia Broadcast Multicast Service) data be not excessive. Thus, the mobile terminal performs: processing of obtaining measurement quality values by measuring reception quality of each base station; processing of deciding on whether the measurement quality value of a serving base station exceeds a certain receiving level; processing of adding measurement quality values of other base stations to the measurement quality value of the serving base station until the sum exceeds the certain receiving level; and processing of notifying the serving base station of the serving base station and other base stations as candidates for an active set for E-MBMS.

Abstract: A printed board 10 is provided with two ground layers 3a, 3b. These ground layers 3a, 3b are electrically insulated inside the printed board. By connecting circuits with different characteristics (low frequency and high frequency, for example) with the different ground layers 3a, 3b, interference of these circuits caused due to a common ground can be minimized.

Abstract: A quadrature modulation circuit includes a low pass filter which operates by a time division process for the in-phase channel and quadrature-phase channel, and reduces address requirements data using amplitude symmetry of the wave form and/or using symmetry wave form on the time axis. The capacity of the ROM is reduced by half or more and the configuration of the quadrature modulation circuit is simplified.

Abstract: A decoding circuit receives signals encoded in differential logical conversion, and decodes the received signals into original signals. During the decoding, a predetermined data bit position included in the original signals is detected in the received signal, and also the predetermined data is forcedly set to the bit position of the decoded signal, thereby bit error propagation is suppressed up to the position of the known data.

Abstract: An automatic output power controller controls signals output by an amplifier amplifying a modulated wave with its envelope varying due to the modulation so that the mean power becomes constant. An equi-output point extraction circuit extracts timing of the output power of the amplifier becoming a constant value from a base band signal or the like, and supplies the timing to a sample-and-hold circuit. The sample-and-hold circuit samples and holds the output power. Difference between the sample-and-hold value and the reference value is supplied to an output power adjusting circuit, and the output power adjusting circuit controls signals output by the amplifier in accordance with the difference so that the mean power becomes constant.

Abstract: In a radio-frequency power amplifier device, having a radio-frequency power amplifier for an input RF signal, part of the output signal of the amplifier is extracted, and the extracted voltage is compared with a reference voltage to apply a negative feedback to the gain control terminal of the power amplifier, thereby to stabilize the output power. The output power value is switched in accordance with a power level control signal. A variable attenuator or a variable-coupling-coefficient coupling means provided in front of the detector circuit switches the attenuation or the coupling coefficient depending on the power level, such that the magnitude of the input to the detector circuit is maintained at a constant level. The detector circuit therefore operates at the same operating point regardless of the switching of the power level, and the dynamic range required of the detector circuit may be narrow. The temperature variation of the output power at the time of low power output is small.

Abstract: A demodulated data recognition and decision device is disclosed in which an input signal such as an intermediate frequency signal or the like is demodulated and digital data corresponding to a demodulated base band signal is recovered. This device is characterized in that a sample clock rate having n-times the bit rate of the digital data is applied to perform a sampling operation wherein a decision of the binary value at the plurality of points in the base band signal is carried out to obtain a decision under majority rule. The value decided under majority rule and then applied as the demodulated digital data is substantially free of errors which might occur from jitters in the base band signal and other sources of noise.