Abstract: A base station apparatus is provided, by which a downlink transmission power (transmission output) can be properly set and frequent handovers of a mobile station (user equipment) can be prevented to occur. The base station apparatus is installed in a small-cell base station communicating with a mobile station in a mobile communication network, and provided with measurement means of measuring a time interval between a timing of receiving a handover request from a macro-cell base station when a mobile station performs a hand-in from a macro cell to a small cell and a timing of receiving information showing a failure of handover from the macro cell to the small cell, from the macro-cell base station, in sate that the small-cell base station is located in the macro cell or neighboring the macro cell and control means of controlling so as to decrease a setting of downlink transmission power based on the time interval measured by the measurement means.

Abstract: A base station apparatus is provided, by which a new base station (cell) can be surely added in a neighboring-cell list even when a maximum value is set for the number of base stations (cells) capable being registered in the neighboring-cell list. The base station apparatus is installed in a base station communicating with a mobile station in a mobile communication network. The base station apparatus comprises memory means of memorizing a list of peripheral base stations located at a periphery of the own base station, list-update means of adding a new peripheral base station in the list when finding the peripheral base station, and delete means of deleting at least one peripheral base station registered at an early timing in the list when the number of peripheral base stations registered in the list reaches to a predetermined maximum value that is set in advance.

Abstract: A base station apparatus of small-cell base station is provided, by which interference from a small-cell in downlink signals of macro cell can be suppressed without lowering a power of downlink signals from the small-cell base station more than necessary, in state that a macro-cell base station is located neighboring the small cell of small-cell base station. The base station apparatus comprises transmission-power control means of controlling a down link transmission power of downlink in a range between a maximum power and a minimum power which are set in advance, and information acquisition means of acquiring information on electrical field intensity of a transmission signal transmitted from the macro-cell base station located at a periphery of the own base station.

Abstract: A base station apparatus capable of ensuring a sufficiently large coverage of a small cell while reducing a power of downlink signals from a small-cell base station so as to be equal to or smaller than an allowable maximum power is provided. The base station apparatus of the small-cell base station comprises measurement means of measuring an interference level from a macro cell located in a periphery of the own base station and transmission-power control means of controlling a downlink transmission power based on a measurement result of the interference level from the macro cell.

Abstract: Provided are a wireless base station apparatus and communication control method whereby a peripheral terminal device immediately hands over to a base station apparatus when said base station apparatus is activated. In response to timer values and the number of terminal units within a coverage area, a controller (504) of an MeNB (500) selects a dormant mode, activation mode or stationary mode for the base station itself and notifies an uplink received signal determiner (505) and transmission power determiner (506) of the selected mode information. In activation mode, the uplink received signal determiner (505) sets the timing for initial connection signals more frequently than dormant mode. In activation mode, the transmission power determiner (506) determines the increase in downlink transmission power over time and notifies the downlink transmission signal processor (507) of the transmission power.

Abstract: Provided are a server device, a base station device, and an identification number establishment method, with which it is possible to avoid CRS interference between neighboring base stations, to improve downstream throughput, and to prevent a UE from erroneous cell selection. When a location information receiving unit (101) of an OAM (100) receives location information of a new eNB, a resource index establishment unit (104) selects a resource index (vshift) other than a resource index (vshift) which is used in an eNB which is neighboring to the new eNB. A cell ID computation unit (105) computes a cell ID from the selected resource index (vshift), and the computed cell ID is transmitted from a cell ID transmission unit (106) to the new eNB.

Abstract: Provided is a network management device capable of suppressing interference of a preamble between cells while securing a predetermined resource. An FGW (500) as the device is a network management device for managing a plurality of base station devices each of which perform communication with communication terminal devices by the SC-FDMA method, wherein the FGW (500) is provided with a parameter determination unit (530) for determining parameters related to an uplink preamble with respect to at least one among the plurality of base station devices, and a parameter notification unit (540) for sending notifications of the determined parameters to the base station devices for which the parameters have been determined; wherein the parameter determination unit (530) determines the parameters so that transmitted sequences of the preamble do not overlap between at least two of the plurality of base station devices.

Abstract: Provided are a server device, a base station device, and an identification number establishment method, with which it is possible to avoid CRS interference between neighboring base stations, to improve downstream throughput, and to prevent a UE from erroneous cell selection. When a location information receiving unit (101) of an OAM (100) receives location information of a new eNB, a resource index establishment unit (104) selects a resource index (vshift) other than a resource index (vshift) which is used in an eNB which is neighboring to the new eNB. A cell ID computation unit (105) computes a cell ID from the selected resource index (vshift), and the computed cell ID is transmitted from a cell ID transmission unit (106) to the new eNB.

Abstract: The small cell base station (100) is provided with: a parameter setting unit (111) that obtains a first parameter and sets the first parameter as a parameter of the small cell base station, said first parameter for instructing the terminal device regarding the transmission timing of the reference signal; a measurement unit (105) for measuring interference power in an received signal according to the timing which is specified by the parameter set by the parameter setting unit (111); a detection unit (113) for detecting a terminal device to be connected to the peripheral base station on the basis of the interference power which is measured by the measurement unit (105); and an interference limiting unit (114) for limiting interference to the terminal device which is detected by the detection unit (113).

Abstract: Provided is a compact base station apparatus (HeNB) whereby frame timing can precisely be synchronized between HeNB and MeNB, thereby suppressing the interference in an upstream channel. In HeNB (100), which forms a cell smaller than a cell formed by MeNB, frame timing detecting unit (111) detects, based on a sync signal received from MeNB, the frame timing of MeNB; a control unit (116) uses the frame timing of MeNB to set the frame timing of a downstream channel in HeNB (100); a transmission RF unit (118) transmits, in accordance with the frame timing of the downstream channel in HeNB (100), a preamble to MeNB; and a TA command extracting unit (114) acquires, from a response signal responsive to the preamble, information indicating a difference in frame timing between MeNB and HeNB (100).

Abstract: Provided are a wireless base station apparatus and communication control method whereby a peripheral terminal device immediately hands over to a base station apparatus when said base station apparatus is activated. In response to timer values and the number of terminal units within a coverage area, a controller (504) of an MeNB (500) selects a dormant mode, activation mode or stationary mode for the base station itself and notifies an uplink received signal determiner (505) and transmission power determiner (506) of the selected mode information. In activation mode, the uplink received signal determiner (505) sets the timing for initial connection signals more frequently than dormant mode. In activation mode, the transmission power determiner (506) determines the increase in downlink transmission power over time and notifies the downlink transmission signal processor (507) of the transmission power.

Abstract: Provided are a server apparatus and an interference control method, wherein interference between cells is inhibited, and a drop in throughput of the entire network is also inhibited. An ABS configuration determining unit (203) of an OMC (200) is provided with an ABS configuration table that is defined such that the frequency with which downstream transmission is stopped is decreased as the number of HeNBs decreases, and the frequency with which downstream transmission is stopped is increased as the number of HeNBs increases. The ABS configuration determining unit (203) obtains the number of HeNBs within an MeNB area, obtains an ABS configuration corresponding to the obtained number of HeNBs from the ABS configuration table, and determines to apply the configuration to the MeNB.

Abstract: The present invention provides a base station device capable of improving the throughput of a whole network by minimizing interference between respective base stations. In a communication system including a plurality of base stations, which transmit a signal by using any of a plurality of different ABS patterns which are sub frame ABS patterns represented by the combination of a transmission sub frame for transmitting a signal and a non-transmission sub frame for suspending the transmission of the signal, a determining unit (104), on the basis of the presence or absence of the interference between an HeNB (100) and other base stations except for the HeNB (100), determines the ABS pattern used by the HeNB (100) from among the plurality of ABS patterns, and a transmitting unit (105) transmits a signal to a terminal connected to the HeNB (100); in accordance with the determined ABS pattern.

Abstract: A monitoring device (200) manages the installation position of a moveable small-sized base station (100), A message analysis unit (202) acquires, from the small-sized base station (100) being managed, peripheral cell information which shows small-sized base stations present in the periphery of the small-sized base station (100) being managed. A database management unit (204) divides map information into a plurality of areas, and stores database information which has established whether or not each of the small-sized base stations (100) can he installed in each area service continuation determination unit (205) permits the installation of the small-sized base station (100) being managed, if the installation position for the small-sized base station (100) being managed, as determined from the acquired peripheral cell information, is an area wherein the installation of the small-sized base station (100) being managed is permitted, as established in the database information.

Abstract: A small-sized base station for which the installation location can be restricted to an appropriate range and can be appropriately managed. A small-sized base station (100) is moveable. A utilities subscriber ID acquisition unit (102) acquires, from the outside, the subscriber ID of utilities in the installation location of the small-sized base station (100). A message generation unit (103) generates a request message containing the subscriber ID, inputted from the utilities subscriber ID acquisition unit (102), and identification information identifying the small-sized base station (100), then sends the generated request message to a monitoring device (200), and requests permission for the installation of the small-sized base station (100) in the installation location. A service management function unit (106) initiates service if the monitoring unit (200) has permitted installation, in response to the sent request message.

Abstract: Provided is a network management device capable of suppressing interference of a preamble between cells while securing a predetermined resource. An FGW (500) as the device is a network management device for managing a plurality of base station devices each of which perform communication with communication terminal devices by the SC-FDMA method, wherein the FGW (500) is provided with a parameter determination unit (530) for determining parameters related to an uplink preamble with respect to at least one among the plurality of base station devices, and a parameter notification unit (540) for sending notifications of the determined parameters to the base station devices for which the parameters have been determined; wherein the parameter determination unit (530) determines the parameters so that transmitted sequences of the preamble do not overlap between at least two of the plurality of base station devices.

Abstract: Frequency hopping is appropriately applied even to a communication format involving a small number of minimum hopping units in one transmission unit according to various conditions, thereby enhancing receiving performance. When frequency hopping is applied to a communication format along which transmission is performed on a per-subframe basis, the subframe including a first slot and a second slot, intra-subframe frequency hopping (Intra-FH) is not applied to first transmission according to the number of retransmission operations, and transmission data of two slots are mapped to the same frequency band. Frequency hopping (Inter/Intra-FH) including inter-subframe frequency hopping and intra-subframe frequency hopping in combination is applied solely to a retransmission symbol used for retransmission (first retransmission and subsequent retransmission), and the transmission data are mapped to different frequency bands on a per-slot basis.

Abstract: Provided is a compact base station apparatus (HeNB) whereby frame timing can precisely be synchronized between HeNB and MeNB, thereby suppressing the interference in an upstream channel. In HeNB (100), which forms a cell smaller than a cell formed by MeNB, frame timing detecting unit (111) detects, based on a sync signal received from MeNB, the frame timing of MeNB; a control unit (116) uses the frame timing of MeNB to set the frame timing of a downstream channel in HeNB (100); a transmission RF unit (118) transmits, in accordance with the frame timing of the downstream channel in HeNB (100), a preamble to MeNB; and a TA command extracting unit (114) acquires, from a response signal responsive to the preamble, information indicating a difference in frame timing between MeNB and HeNB (100).

Abstract: A terminal device free of interference between an RACH and a PUSCH or the like even when a base station device with a large coverage is installed. In the device, a configuration number extraction unit (103) extracts a configuration number from a BCH received by a BCH reception unit (102). A control unit (104) determines the corresponding RACH format (the necessity of repetition, the CP length TCP, the second preamble length TPRE2, and the GT length TGT) according to the configuration number, notifies a repetition unit (109) of the result of the judgment of necessity of repetition, notifies the repetition unit (109) of the second preamble length TPRE2, notifies a CP addition unit (110) of the CP length TCP, and notifies a GT addition unit (112) of the GT length TGT. When the repetition unit (109) receives the notification of performing the repetition, it performs the repetition according to the second preamble length received from a TPRE2 determination section (154).

Abstract: A transmitter which is capable of producing an SSB signal having a sharp spectrum cut. The transmitter generates the SSB signal using an FFT circuit (103) which Fourier-transforms a transmission symbol, a zero insertion circuit (104) which zeros the component of either the USB component signal or the LSB component signal outputted from the FFT circuit (103), an IFFT circuit (105) which inverse-Fourier-transforms the output from the zero insertion circuit (104), and a parallel-serial conversion circuit (106) which parallel-serial-converts the output from the IFFT circuit (105).