Abstract: In a mobile communication system, a mobile station notifies a first base station of a first holding period when a first mode, in which the mobile station performs wireless communication with one of the first base station and a second base station, is set, and notifies the first base station of a second holding period which is longer than the first holding period when a second mode, in which the mobile station performs wireless communication with the first base station and does not performs wireless communication with the second base station, is set. The first base station discards connection information when the notified holding period has elapsed after the mobile station is unable to perform the wireless communication with the first base station.

Abstract: A mobile communication apparatus can perform data communication by the use of a first radio access network and a second radio access network. When a receiving section detects during time for which a processor is in a suspend state that the mobile communication apparatus moves out of a coverage area of the first radio access network, the receiving section releases the suspend state of the processor. When the suspend state of the processor is released as a result of detecting that the mobile communication apparatus moves out of the coverage area of the first radio access network, the control section establishes a connection to the second radio access network by the use of the processor.

Abstract: In a mobile communication apparatus capable of performing data communication by use of a first wireless access network and a second wireless access network, a receiver processes signals received from the first wireless access network and the second wireless access network, and a controller includes a processor, and establishes a connection to the second wireless access network and stops processing of signals received from the first wireless access network when the processor transitions to a suspend state after data communication using the first wireless access network is performed.

Abstract: A wireless communication unit is configured to perform data communication using a first wireless access network and data communication using a second wireless access network having a larger coverage area than a coverage area of the first wireless access network. A control unit is configured to perform a handover from the first wireless access network to the second wireless access network after the data communication using the first wireless access network is finished, and subsequently cause a mobile communication apparatus to enter into standby mode.

Abstract: When a first base station serving a mobile communication terminal in a standby mode, a first neighbor list is acquired from the first base station and stored in a memory. If the serving base station is changed in a standby mode from the first base station to a second base station, a second neighbor list is acquired from the second base station. When the second base station is serving the mobile communication terminal in a standby mode, the communication quality between the mobile communication terminal and each second peripheral base station listed in the acquired second neighbor list, and between the terminal and each first peripheral base station listed in the stored first neighbor list. Based on the measurement results, a peripheral base station that satisfies a preset condition is selected as a hand-off destination candidate.

Abstract: The terminal apparatus comprises first cell detecting means for receiving radio signals of the first radio scheme by using various kinds of PN offsets and for detecting receiving levels of the respective cells, and second cell detecting means for receiving radio signals of the second radio scheme by using the PN offsets based on a result of the detection of the first cell detecting means and for detecting receiving levels of the respective cells.

Abstract: A radio communication system in which information of a unit length is constituted with a plurality of frames as a set and the information is transmitted/received between a base station and a mobile station. A control section of the base station decides, during a telephone communications, performed between the base station and the mobile station, when an instruction to switch the frequency to a second frequency is received from an upper order network via a transmission/reception section, a time interval for the telephone communication using the second frequency so as not to stride over a boundary of frame sets adjacent to each other.

Abstract: Control unit controls sender-receiver unit to execute cell search. As a result, if control unit attempts location registration via base station and the use is rejected, control unit stores identification information of the network to which the base station belongs in inhibit network list storage area, stores identification information of a carrier frequency used for communications with the base station in inhibit frequency list storage area, and detects a cell capable of carrying out communications on the basis of the identification information stored in the storage areas.

Abstract: A control unit controls a 1x RAKE receiving unit to intermittently receive a paging signal transmitted from a first base station in a first cycle, in the first cycle. The control unit also controls a 1xEV-DO RAKE receiving unit to intermittently receive a paging signal transmitted from a second base station in a second cycle, in a cycle which is a multiple of natural number n of the second cycle.

Abstract: If a control unit detects that it is located outside the service area, searching for a base station on the basis of information stored in a first list storage area is conducted with a certain cycle by a first searching means and searching for a base station on the basis of information stored in a second list storage area is conducted in a gradually extended cycle, in accordance with the number of times Cs of searching for the base station, by a second searching means.

Abstract: The terminal apparatus comprises first cell detecting means for receiving radio signals of the first radio scheme by using various kinds of PN offsets and for detecting receiving levels of the respective cells, and second cell detecting means for receiving radio signals of the second radio scheme by using the PN offsets based on a result of the detection of the first cell detecting means and for detecting receiving levels of the respective cells.

Abstract: A control unit controls a 1× RAKE receiving unit to intermittently receive a paging signal transmitted from a first base station in a first cycle, in the first cycle. The control unit also controls a 1× EV-DO RAKE receiving unit to intermittently receive a paging signal transmitted from a second base station in a second cycle, in a cycle which is a multiple of natural number n of the second cycle.

Abstract: A control unit detects a system timing from a Sync message received from a 1x base station, controls a 1x RAKE receiving unit, a 1x spreading unit, a 1xEV-DO RAKE receiving unit, and a 1xEV-DO spreading unit on the basis of detected system timing, and controls a transmit-receive timing with the 1x base station and a transmit-receive timing with the 1xEV-DO base station.

Abstract: Transmission timing of the control signal is controlled such that each transmission timing differs between at least adjacent base stations. Thus, the mobile station can reproduce the control signal using only a predetermined spreading signal for the base station which transmits the control single. Therefore the time for reproducing process of the control signal can be reduced.

Abstract: When a first base station serving a mobile communication terminal in a standby mode, a first neighbor list is acquired from the first base station and stored in a memory. If the serving base station is changed in a standby mode from the first base station to a second base station, a second neighbor list is acquired from the second base station. When the second base station is serving the mobile communication terminal in a standby mode, the communication quality between the mobile communication terminal and each second peripheral base station listed in the acquired second neighbor list, and between the terminal and each first peripheral base station listed in the stored first neighbor list. Based on the measurement results, a peripheral base station that satisfies a preset condition is selected as a hand-off destination candidate.

Abstract: A multiplier multiplies a baseband signal with a scramble code generated by a CPICH scramble code generator and an integrator integrates the result of the multiplication. A symbol selection control unit controls the integrator such that the integrator integrates each of two successive slots in which combinations of the symbols transmitted from two antennas of a base station are the same, in accordance with the information about the synchronous positions of the slots and frames. The result of the integration is delayed by a 1-symbol delay unit and then a code of a complex component is inverted by a complex conjugate unit. A multiplier multiplies the outputs of the integrator and complex conjugate unit, which are shaped in a complex number, to obtain an amount of phase rotation between the successive symbols, i.e. a frequency error.

Abstract: A radio communication system is disclosed in which information of a unit length is constituted with a plurality of frames as a set and the information is transmitted/received between a base station and a mobile station. A control section of the base station decides, during a telephone communication is performed between the base station and the mobile station, when an instruction to switch the frequency to a second frequency is received from an upper order network via a transmission/reception section, a time interval for the telephone communication using the second frequency so as not to stride over a boundary of frame sets adjacent to each other.

Abstract: There is disclosed a spread spectrum wireless communications device capable of conducting a pilot search for a frequency different from the traffic-channel frequency used in a conversation while suppressing deterioration of voice quality. One frame is selected from every 5 frames such that the selected frames are not adjacent to each other. The reception frequency (searched frequency) is switched from frequency f1 used for communication to other frequency f2 during the period of any one of the selected frames. During the periods (e.g., N1-1, N1-2, and N1-3) of plural ones (e.g., 3 frames) of the frames in which f2 is being received, neighboring sets are searched for phases continuously.

Abstract: There is disclosed a spread spectrum wireless communications device capable of conducting a pilot search for a frequency different from the traffic-channel frequency used in a conversation while suppressing deterioration of voice quality. One frame is selected from every 5 frames such that the selected frames are not adjacent to each other. The reception frequency (searched frequency) is switched from frequency f1 used for communication to other frequency f2 during the period of any one of the selected frames. During the periods (e.g., N1-1, N1-2, and N1-3) of plural ones (e.g., 3 frames) of the frames in which f2 is being received, neighboring sets are searched for phases continuously.

Abstract: A multiplier multiplies a baseband signal with a scramble code generated by a CPICH scramble code generator and an integrator integrates the result of the multiplication. A symbol selection control unit controls the integrator such that the integrator integrates each of two successive slots in which combinations of the symbols transmitted from two antennas of a base station are the same, in accordance with the information about the synchronous positions of the slots and frames. The result of the integration is delayed by a 1-symbol delay unit and then a code of a complex component is inverted by a complex conjugate unit. A multiplier multiplies the outputs of the integrator and complex conjugate unit, which are shaped in a complex number, to obtain an amount of phase rotation between the successive symbols, i.e. a frequency error.