Abstract: A technology is disclosed that provides a handover preprocessing system and the like, the handover preprocessing system capable of eliminating waste of resources used as a result of notification being reissued of a CSG cell for which access is not granted.

Abstract: A communication terminal includes: a notification information acquiring section which acquires notification information containing information related to all frequencies allocated to cells provided by a base station that provides access-restricted cells; a frequency information storing section which stores cell information containing information contained in the notification information; a frequency selecting section which selects one arbitrary frequency from a plurality of frequencies provided by an access-restricted base station to be accessible in a past when detecting that the communication terminal approximates to a cell of the access-restricted base station to be accessible in the past, based on the notification information and the cell information; and a transmitting section which transmits the proximity indication message containing the frequency selected by the frequency selecting section, to the base station that provides the currently connected cell.

Abstract: A terminal device (1) is provided with: a trigger judging section (6) judging whether an event trigger for performing handover from a macrocell to a CSG cell has occurred or not; a first measurement result reporting section (7) transmitting a first measurement result report which includes the PCI of a CSG cell for which an event trigger has occurred, to an eNB; a CGI detecting section (9) detecting the CGI of the CSG cell for which the event trigger has occurred, on the basis of measurement setting information transmitted from the eNB; and a second measurement result reporting section (10) transmitting a second measurement result report which includes the detected CGI, to the eNB. When event triggers have continuously occurred, a report transmission controlling section (13) controls transmission of the measurement result reports on the basis of the reception qualities of the CSG cells to reduce the frequency of transmission of the measurement result reports.

Abstract: A technology is disclosed that provides a handover destination specification system and the like capable of reducing signaling load and shortening handover processing time. According to the technology, the handover destination specification system is configured by: a mobile terminal that measures a reception quality of each cell indicating an accessible range formed by a plurality of base stations capable of being connection targets of the mobile terminal, and when the measured reception quality satisfies a predetermined condition, transmits to a connection base station, a first message including identification information of the cell that satisfies the predetermined condition and information on the reception quality of the cell; and the connection base station that transmits to the mobile terminal, a second message including information for detecting unique global identification information of the cell of which the reception quality has been measured, based on the first message.

Abstract: A wireless communication system comprises an MME (70) which generates a white list in which CSG cells being accessible by a UE (10) are enumerated, an HeNB gateway (50) which decides based on the white list whether or not access is possible, and a home base station (30) (80) of the CSG cell. The UE (10) comprises a manual selection executing unit which accepts manual selection of a CSG cell, and requests the Mobility Management Entity to add the CSG cell to the white list; and a measurement report message generating unit which generates the Measurement report message attached with information indicating that the white list is being updated, if the CSG cell which has been accepted by manual selection is comprised in CSG cells to be included in the Measurement report message, and the selected CSG cell is not included in the white list stored in a white list storing unit.

Abstract: In a user equipment (UE)(100), a handover from a macro cell base station (eNB)(200) to a CSG cell base station (HeNB)(300) is controlled based on a result of comparison between reception quality from the eNB (200) and reception quality from the HeNB (300) located in a macro cell. The UE (100) comprises: a reception quality measurement unit (104) for measuring the reception quality of the eNB (200) and the reception quality of the HeNB (300); an offsetting unit (106) for offsetting the reception quality of the HeNB (300) with an offset value that makes the reception quality of the HeNB (300) relatively higher than the reception quality of the eNB (200); and an offset value correcting unit (105) for correcting the offset value according to the reception quality of the eNB (200). A user equipment is thereby provided in which handover control can be performed with an appropriate offset value that takes into consideration interference in the uplink from the user equipment to the base station.

Abstract: Provided are a base station device and a mobile station device, which can lighten a cell-search processing. The base station device (100) includes a frame constitution unit (130) for forming a frame, in which a pilot symbol multiplied by a base station scrambling code assigned to that device and a plurality of sequences contained in the corresponding sequence set is arranged in at least the head or tail, and a radio transmission unit (155) for sending the formed frame. On the receiving side of the frame, the frame timing can be detected from the position of a pilot symbol contained in that frame. Since the base station scrambling code and the sequence set containing the sequences are made to correspond to each other, candidates can be narrowed to at most the base station scrambling codes of the number of the combinations of the sequences contained in the sequence set, by detecting the sequences multiplied by the pilot symbol, so that the cell search processing can be lightened.

Abstract: There is provided a multi-carrier communication method capable of preventing lowering of a throughput of another mobile device accompanying allocation of a sub-carrier for a new mobile station device. This multi-carrier communication method can acquire reception quality information for one of the sub-carriers already allocated in an MS (150a) from a BS (100a) and for one of the sub-carriers which can be allocated in the MS (150a) from the BS (100b). According to the reception quality information, a release sub-carrier is selected from the sub-carriers already allocated and a new-allocation sub-carrier is selected from the sub-carriers which can be allocated. The new-allocation sub-carrier has a frequency different from the already-allocated sub-carriers excluding the release sub-carrier. The BS (100a) is instructed to release the selected release sub-carrier and the BS (100b) is instructed to allocate the selected new-allocation sub-carrier in the MS (150a).

Abstract: A mobile terminal (10) is used in a network comprising a wide area cell and small cells included in the wide area cell. The mobile terminal (10) comprises: a basic communication functionality (12) for receiving offset information used for cell selection and offset correction information for correcting the offset information to increase ease of connection with a micro BS set by a user, both information being broadcasted from a macro base station; a inclination setting section (14) for accepting a setting for a priority home base station with which a user desires to preferentially establish a connection among a plurality of small cells; a offset information correction processing section (18) for correcting the offset information with the offset correction information when the priority home base station is detected; and a cell selection section (24) for performing cell selection based on reception quality with the added offset information.

Abstract: A mobile station device which can correctly search for another cell quickly in a communication system using the OFCDM method. A blank subcarrier correlation calculating section (502) calculates the correlation between the blank subcarriers of the CPICH symbols adjacent to the cell signal of this mobile station device. A correlation-between-adjacent-symbols calculating section (503) calculates correlation between adjacent symbols in the frequency direction. A correlation value comparing section (505) compares the correlation values inputted from the correlation-between-adjacent-symbols calculating section (503) and detects the boundary between adjacent symbols having the maximum correlation value as a frame timing of the another cell.

Abstract: When a handover request for performing a handover of a terminal (70) from a macro cell C1 to a CSG cell C2 is received from an SeNB 10 (S8), a base station (TeNB) (40) of the CSG cell C2 transmits a handover response in accordance with a handover enabled/disabled state (S12). The handover response includes an identifier of the terminal (70) in the CSG cell C2. Upon receiving the response, the SeNB (10) notifies the identifier to the terminal (70) (S14). The TeNB (40) repeatedly transmits a dedicated signal containing a handover command via a dedicated channel set using the identifier at an interval shorter than a gap period (S18). Accordingly, whether or not access is permitted can be judged promptly and a smooth handover can be realized.

Abstract: There is provided a multi-carrier communication method capable of preventing lowering of a throughput of another mobile device accompanying allocation of a sub-carrier for a new mobile station device. This multi-carrier communication method can acquire reception quality information for one of the sub-carriers already allocated in an MS (150a) from a BS (100a) and for one of the sub-carriers which can be allocated in the MS (150a) from the BS (100b). According to the reception quality information, a release sub-carrier is selected from the sub-carriers already allocated and a new-allocation sub-carrier is selected from the sub-carriers which can be allocated. The new-allocation sub-carrier has a frequency different from the already-allocated sub-carriers excluding the release sub-carrier. The BS (100a) is instructed to release the selected release sub-carrier and the BS (100b) is instructed to allocate the selected new-allocation sub-carrier in the MS (150a).

Abstract: It is possible to provide a novel pilot transmission method which can calculate an accurate channel estimation value, a MIMO transmission device using the pilot transmission method, and a MIMO reception device which communicates with the MIMO transmission device. The MIMO transmission device (100) includes phase adjustment units (130-1, 130-2) which are controlled by a pilot transmission control unit (170) to multiply parallel pilot signals by a phase adjustment coefficient group so as to adjust the pilot signal transmission timing. The pilot transmission control unit (170) differentiates the order of the transmitting antennas in accordance with the pilot transmission timing between an even-number subcarrier group and an odd-number subcarrier group. At a reception side, a path not influenced by the inter-path interference is extracted for each of the combinations of the transmitting antennas and the subcarrier groups.

Abstract: There is provided a multi-carrier communication method capable of preventing lowering of a throughput of another mobile device accompanying allocation of a sub-carrier for a new mobile station device. This multi-carrier communication method can acquire reception quality information for one of the sub-carriers already allocated in an MS (150a) from a BS (100a) and for one of the sub-carriers which can be allocated in the MS (150a) from the BS (100b). According to the reception quality information, a release sub-carrier is selected from the sub-carriers already allocated and a new-allocation sub-carrier is selected from the sub-carriers which can be allocated. The new-allocation sub-carrier has a frequency different from the already-allocated sub-carriers excluding the release sub-carrier. The BS (100a) is instructed to release the selected release sub-carrier and the BS (100b) is instructed to allocate the selected new-allocation sub-carrier in the MS (150a).

Abstract: A base station device and a mobile station device both enabling improvement of the reception quality of transmission data at a mobile station by preventing a sequence for establishing synchronism and the transmission data from interfering with each other. In the base station device (100), a frame creating section (120) creates a frame in such a way that the transmission data and the sequence used for identifying the frame timing and the code group to which the base station scrambling code belongs are so arranged that they are not superposed on one the other at the same symbol specified by the sub-carrier and time, and an RF transmitting section (150) transmits the frame.

Abstract: It is possible to provide a radio communication base station device, a radio communication terminal device, and a radio communication method which reduce a signaling load and perform flexible gap allocation. A target gap length generation unit (120) uses gap parameter configuration information acquired from a gap parameter generation unit (110) to subtract a gap offset from a maximum permissible gap length so as to calculate a minimum gap length. Moreover, when a new gap offset is reported from a network, a target gap length generation unit (120) re-calculates the minimum gap length according to the maximum permissible gap length which can be used.

Abstract: A scalable bandwidth system wherein even when various terminals having different bandwidth capabilities are existent in a cell, the unbalance of traffic in the maximum bandwidth can be reduced. Terminals (200) transmit their respective bandwidth capability information. A base station (100) assigns, based on the bandwidth capability information and identification signals transmitted from the terminals (200), communication bands to the respective terminals, and transmits, by use of a shared channel, information of the communication bands assigned to the terminals. In this way, the base station (100) can assign the bands to the terminals with the bandwidth capabilities of the respective terminals in the cell taken into account, whereby the unbalance of traffic in the maximum bandwidth can be reduced.

Abstract: There are provided a base station device and a mobile station device for increasing the speed of cell search by introducing identification of TTI timing into the cell search. In the base station device (100), a frame configuration unit (120) forms a frame by arranging a TTI synchronization sequence (SCH1 sequence) used for identifying the frame timing and a TTI synchronization sequence (SCH2 sequence) used for identifying the TTI timing in such a manner that they are not superimposed on the same symbol specified by the frequency and the time. A radio transmission unit (145) sends the frame. The frame configuration unit (120) arranges the frame synchronization sequence at a predetermined position from the frame starting symbol and the TTI synchronization sequence at a predetermined position from the TTI starting symbol. The mobile station device (200) receiving the frame detects the TTI timing by using the TTI synchronization sequence.

Abstract: A scalable bandwidth system wherein even if a terminal does not know the breakdowns of the services in all of the bandwidths, it can perform a correlation processing of synchronous channels (SCH). A base station repetitively transmits a synchronous channel, by unit of the shortest bandwidth (e.g., 1.25 MHz) of a plurality of bandwidths served by the system, over the whole band of the longest bandwidth (e.g., 5 MHz). The terminal calculates the correlation between a synchronous channel sequence signal of the unit of the shortest bandwidth held in advance and the repetitively transmitted synchronous channel, and determines, as a frame timing, a timing at which the maximum correlation value is obtained.

Abstract: There are provided a base station device transmitting a frame capable of performing cell search without being affected by arrangement of a pilot channel and a mobile station device performing cell search by using the frame. In the base station device (100), a frame formation unit (120) forms a frame by arranging a P-SCH sequence used for synchronization of a frame timing on some symbols of multi-carrier symbols at a predetermined position from the frame head in the frequency direction and arranging an S-SCH sequence corresponding to a base station scrambling code so that it is not overlapped on some of the multi-carrier symbols at a predetermined position from the frame head with the same symbol as the frame synchronization sequence. The frame is received by the mobile station device (200) and the S-SCH is demodulated. Thus, it is possible to directly identify the base station scrambling code without using a pilot channel.