WO2009148164A1 - 移動通信方法及び無線基地局 - Google Patents
移動通信方法及び無線基地局 Download PDFInfo
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- WO2009148164A1 WO2009148164A1 PCT/JP2009/060386 JP2009060386W WO2009148164A1 WO 2009148164 A1 WO2009148164 A1 WO 2009148164A1 JP 2009060386 W JP2009060386 W JP 2009060386W WO 2009148164 A1 WO2009148164 A1 WO 2009148164A1
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- radio base
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- power level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/32—TPC of broadcast or control channels
- H04W52/325—Power control of control or pilot channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/225—Calculation of statistics, e.g. average, variance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
- H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/246—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter calculated in said terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present invention relates to a mobile communication method in which each radio base station transmits a common control signal to the entire cover area, and a radio base station configured to transmit the common control signal to the entire cover area.
- a service area (cover area) and traffic are set before the construction of a radio base station for public communication in order to meet a service quality requirement in a communication start request from a mobile station that occurs irregularly.
- Predict and design the wireless communication parameters such as the installation position and configuration of the public communication radio base station and the transmission power level of the downlink common control signal on the desktop by means of simulation or the like, and after the construction of the public communication radio base station Therefore, complicated cell / system design / evaluation work is required to regularly check and maintain the service area, communication quality, and system capacity.
- the home radio base station measures the reception power level of the common control signal transmitted by the neighboring radio base stations, and based on the reception power level, transmits the common control signal in its own station.
- a method for reducing the operation required for the above-described cell system design / evaluation by automatically adjusting the power level is known.
- the second home radio base station that is adjacent to the first home radio base station and is installed later than the first home radio base station receives the reception power of the common control signal transmitted by the first home radio base station.
- the cover area becomes narrower than that of the first home radio base station, and there is a problem that unfairness of the cover area occurs between the home radio base stations.
- the present invention has been made in view of the above-described problems, and provides a mobile communication method and a radio base station that can adjust the cover area fairly between adjacent home radio base stations. Objective.
- a first feature of the present invention is a mobile communication method in which each radio base station transmits a common control signal to the entire cover area, and the first radio base station is a peripheral radio.
- the first radio base station and the neighboring radio base stations detect the common period for a predetermined period when detecting a state in which no mobile station is under control.
- the transmission of the control signal may be stopped.
- the first radio base station determines the transmission power of the common control signal based on an average value of the measured reception power level of the common control signal in a predetermined measurement period. You may adjust the level.
- the first radio base station is transmitted by the neighboring radio base station using at least one of a predetermined frequency, timing, and code.
- a common control signal may be identified.
- the first radio base station decreases the transmission power level of the common control signal when the average value falls below a first threshold, and the average value May exceed the second threshold, the transmission power level of the common control signal may be increased.
- a second feature of the present invention is a radio base station, which is configured to transmit a common control signal to the entire cover area, and is a common base station transmitted by neighboring radio base stations.
- a measurement unit configured to measure the received power level of the control signal, and configured to adjust the transmission power level of the common control signal based on the measured received power level of the common control signal
- the adjusting unit is configured to reduce the transmission power level of the common control signal when detecting a state in which there is no mobile station located under the adjusting unit. To do.
- the adjustment unit may be configured to stop transmission of the common control signal for a predetermined period when detecting a state in which there is no mobile station being served by the adjustment unit. Good.
- the adjustment unit is configured to adjust the transmission power level of the common control signal based on an average value of the measured reception power level of the common control signal in a predetermined measurement period. It may be.
- the measurement unit identifies the common control signal transmitted by the peripheral radio base station using at least one of a predetermined frequency, timing, and code. It may be configured.
- the adjustment unit decreases the transmission power level of the common control signal, and the average value exceeds a second threshold.
- the transmission power level of the common control signal may be increased.
- FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
- FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating an example of the reception power level of the common control signal received by the radio base station according to the first embodiment of the present invention.
- FIG. 4 is a sequence diagram showing operations of the mobile communication system according to the first embodiment of the present invention.
- FIG. 5 is a diagram illustrating a change in the coverage area of each radio base station in the mobile communication system according to the first embodiment of the present invention.
- the mobile communication system includes a network device 100, a security device SGW (Security Gateway) 400, and radio base stations 200 and 201.
- SGW Security Gateway
- the radio base stations 200 and 201 are accommodated in the network device 100.
- the network device 100 assigns radio communication parameters used for radio communication between the radio base stations 200 and 201 and the mobile station 300 to the radio base stations 200 and 201, and the radio communication parameters. Or is configured to manage.
- the function of the network device 100 is provided in the radio network controller RNC.
- the radio base stations 200 and 201 are home radio base stations under the control of a user (owner of the radio base stations 200 and 201) who subscribes to a communication service provided by a mobile communication carrier.
- the radio base stations 200 and 201 are installed in a LAN (Local Area Network) managed by the above-described user, and are connected to the network on the mobile communication carrier network via the network of the FTTH or ADSL access carrier. It is configured to be connected to the device 100.
- LAN Local Area Network
- the SGW 400 is installed on the boundary line of the mobile communication carrier network.
- the SGW 400 is a gateway device for protecting the mobile communication carrier network from unauthorized access from other networks, and is configured to pass only access authorized by the authentication procedure to the mobile communication carrier network. Yes.
- radio base stations 200 and 201 Since the functions of the radio base stations 200 and 201 are basically the same, the function of the radio base station 200 will be described below as a representative.
- the radio base station 200 includes a mobile station state management unit 11, a common control signal reception unit 12, and a common control signal transmission unit 13.
- the mobile station state management unit 11 is configured to manage whether or not there is a mobile station in communication in a cell under the radio base station 200 or whether or not there is a standby mobile station. Has been.
- the mobile node may be configured to confirm with a higher-order node whether or not there is a mobile station performing location registration for a subordinate cell (femto cell).
- the mobile station state management unit 11 may be configured to supplement whether or not there is a standby mobile station by supplementing the location registration area signal transmitted by each mobile station.
- the common control signal receiving unit 12 is configured to receive the common control signal transmitted by the peripheral radio base station and measure the received power level of the common control signal.
- the common control signal receiving unit 12 may be configured to calculate an average value of the measured received power level of the common control signal in a predetermined measurement period T.
- the common control signal receiving unit 12 is configured to identify the common control signal transmitted by the peripheral radio base station using at least one of a predetermined frequency, timing, and code. Yes.
- the common control signal transmission unit 13 is configured to transmit a common control signal to the entire cover area (cell).
- the common control signal transmission unit 13 receives the reception power level of the common control signal measured by the common control signal reception unit 12 (or an average value of the reception power level of the common control signal in a predetermined measurement period T). Is configured to adjust the transmission power level of the common control signal.
- the common control signal transmission unit 13 is configured to decrease the transmission power level of the common control signal when the average value of the reception power level of the common control signal in the predetermined measurement period T is lower than the first threshold. Has been.
- the common control signal transmission unit 13 refers to the mobile station state management unit 11 and detects the common control signal when it detects a state in which there is no mobile station (communication or standby mobile station) under its control. It is configured to reduce the transmission power level of the signal.
- the common control signal transmission unit 13 is configured to stop the transmission of the common control signal when the mobile station state management unit 11 is referred to and a state in which there is no subordinate mobile station is detected. ing.
- FIG. 4 the operation of the mobile communication system according to the first embodiment of the present invention, specifically, the coverage area adjacent to the coverage area of radio base station 200 during operation of radio base station 200 is shown. An operation for adjusting the cover areas of the radio base stations 200 and 201 when the radio base station 201 is newly installed will be described.
- step S1000 the newly installed radio base station 201 attempts to receive the common control signal channel transmitted by the neighboring radio base stations.
- step S1001 the radio base station 201 receives the common control signal transmitted by the radio base station 200.
- step S1002 the radio base station 201 sets the transmission power level of the common control signal transmitted by the own station based on the reception power level of the common control signal of the radio base station 200.
- the relationship between the cover area of the radio base station 200 and the cover area of the radio base station 201 is as shown in FIG. 5A, and the cover area of the radio base station 201 is transmitted by the radio base station 200. Since the received power level of the common control signal is adjusted so as not to interfere with the radio base station 200, the cover area is relatively narrow compared to the cover area of the radio base station 200.
- the radio base station 201 since the radio base station 201 does not receive interference from the radio base station 200, it is not necessary to reduce the coverage area of the own base station.
- the radio base station 200 When the radio base station 200 detects in step S1003 that the mobile station is not located in the subordinate cell, the radio base station 200 stops transmitting the common control signal in step S1004.
- step S1005 when it is detected that the average value of the received power level in the measurement section T is small (see FIG. 3) and the average value of the received power level is below the first threshold value, in step S1006, the radio base station 201 decreases the transmission power level of the common control signal transmitted by the local station.
- the radio base station 201 detects that the average value of the received power level is lower than the first threshold, the radio base station 201 detects that the interference has decreased, and thus reduces the transmission power level.
- step S1007 similarly to the radio base station 201, the reception power level of the common control signal transmitted by the neighboring radio base station 201 And the transmission power level of the common control signal of the own station is determined based on the average value of the received power levels.
- the wireless base station 201 detects that the average value of the received power level exceeds the first threshold, it means that the interference has increased, and thus increases the transmission power level.
- the radio base station 200 since the transmission power level of the common control signal of the radio base station 201 is higher than before the transmission of the common control signal of the radio base station 200 is turned off, the radio base station 200 When it is detected that the reception power level of the transmitted common control signal exceeds the third threshold value, the transmission power level of the common control signal of the radio base station 200 is decreased in step S1008.
- the relationship between the cover area of the radio base station 200 and the cover area of the radio base station 201 is as shown in FIG. 5B, and the transmission power level of the common control signal of the radio base station 200 and the radio base station
- the difference from the transmission power level of the common control channel 201 is smaller than that in the case of FIG. 5A, and the area adjustment is performed more fairly between the radio base station 200 and the radio base station 201. become.
- the area variation converges in a situation where the cover area of the radio base station 200 and the cover area of the radio base station 201 are substantially equal.
- each of the transmission power levels of the common control signal can be autonomously adjusted according to the reception power level of the common control signal transmitted by the peripheral radio base station.
- the radio base station when there is no mobile station located in the subordinate cell, by reducing the transmission of the common control signal, between the radio base station 200 and the radio base station 201, more The cover area can be adjusted fairly.
- the W-CDMA mobile communication system has been described as an example.
- the present invention is not limited to such a mobile communication system.
- the LTE (Long Term Evolution) system is used.
- the present invention can also be applied to other mobile communication systems.
- each radio base station autonomously adjusts the transmission power level of the common control signal based on the reception power level of the common control signal transmitted by the neighboring radio base stations.
- the same operation can be performed regardless of the network configuration such as the W-CDMA system and the LTE system.
- the mobile communication system according to the present embodiment is an LTE mobile communication system
- at least a part of the functions of the network device 100 described above is provided in each of the radio base stations 200 and 201 or the switching center MME. It may be.
- the mobile communication system according to the present embodiment is an LTE mobile communication system and the aggregation device HNB-GW that accommodates the radio base stations 200 and 201 is provided, the network device described above is used. At least a part of the functions of 100 may be provided in the aggregation device HNB-GW.
- the mobile communication system according to the present embodiment is a W-CDMA mobile communication system and the aggregation device HNB-GW that accommodates the radio base stations 200 and 201 is provided, At least a part of the functions of the network device 100 may be provided in the aggregation device HNB-GW.
- the mobile communication system according to the present embodiment is a W-CDMA mobile communication system
- at least part of the functions of the network device 100 described above may be provided in the exchange MSC / SGSN.
- the operations of the radio base stations 200 and 201 and the network device 100 described above may be implemented by hardware, may be implemented by software modules executed by a processor, or may be implemented by a combination of both. Also good.
- the software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM).
- RAM Random Access Memory
- flash memory ROM (Read Only Memory)
- EPROM Erasable Programmable ROM
- EEPROM Electrically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM.
- it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
- Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Further, such a storage medium and a processor may be provided in the ASIC. Such an ASIC may be provided in the radio base stations 200 and 201 and the network device 100. Further, the storage medium and the processor may be provided in the radio base stations 200 and 201 and the network device 100 as discrete components.
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Abstract
Description
図1乃至図3を参照して、本発明の第1の実施形態に係る移動通信システムの構成について説明する。
図4を参照して、本発明の第1の実施形態に係る移動通信システムの動作、具体的には、無線基地局200の運用中に、無線基地局200のカバーエリアと隣接するカバーエリアを有する無線基地局201が新たに設置された場合の無線基地局200及び201のカバーエリアを調整する動作について説明する。
本発明の第1の実施形態に係る移動通信システムによれば、周辺無線基地局によって送信された共通制御信号の受信電力レベルによって共通制御信号の送信電力レベルと自律的に調整することができる各無線基地局において、配下のセルに在圏する移動局が存在しない状態になった場合に、共通制御信号の送信を減少させることによって、無線基地局200と無線基地局201との間で、より公平にカバーエリアを調整することができる。
上述の実施形態では、W-CDMA方式の移動通信システムを例に挙げて説明されているが、本発明は、かかる移動通信システムに限定されるものではなく、例えば、LTE(Long Term Evolution)方式の移動通信システムにも適用可能である。
Claims (10)
- 各無線基地局が、カバーエリア全体に対して共通制御信号を送信する移動通信方法であって、
第1無線基地局が、周辺無線基地局によって送信された共通制御信号の受信電力レベルを測定する工程Aと、
前記第1無線基地局が、測定した前記共通制御信号の受信電力レベルに基づいて、前記共通制御信号の送信電力レベルを調整する工程Bと、
前記第1無線基地局及び前記周辺無線基地局が、配下に在圏する移動局が存在しない状態を検知した場合に、前記共通制御信号の送信電力レベルを減少させる工程Cとを有することを特徴とする移動通信方法。 - 前記工程Cにおいて、前記第1無線基地局及び前記周辺無線基地局は、配下に在圏する移動局が存在しない状態を検知した場合に、所定期間、前記共通制御信号の送信を停止することを特徴とする請求項1に記載の移動通信方法。
- 前記工程Bにおいて、前記第1無線基地局は、測定した前記共通制御信号の受信電力レベルの所定測定期間における平均値に基づいて、前記共通制御信号の送信電力レベルを調整することを特徴とする請求項1に記載の移動通信方法。
- 前記工程Aにおいて、前記第1無線基地局は、予め決められている周波数、タイミング、コードの少なくても1つを用いて、前記周辺無線基地局によって送信された共通制御信号を同定することを特徴とする請求項1に記載の移動通信方法。
- 前記工程Bにおいて、前記第1無線基地局は、前記平均値が第1閾値を下回った場合に、前記共通制御信号の送信電力レベルを減少させ、該平均値が第2閾値を上回った場合に、該共通制御信号の送信電力レベルを増加させることを特徴とする請求項3に記載の移動通信方法。
- カバーエリア全体に対して共通制御信号を送信するように構成されている無線基地局であって、
周辺無線基地局によって送信された共通制御信号の受信電力レベルを測定するように構成されている測定部と、
測定した前記共通制御信号の受信電力レベルに基づいて、前記共通制御信号の送信電力レベルを調整するように構成されている調整部とを具備し、
前記調整部は、配下に在圏する移動局が存在しない状態を検知した場合に、前記共通制御信号の送信電力レベルを減少させるように構成されていることを特徴とする無線基地局。 - 前記調整部は、配下に在圏する移動局が存在しない状態を検知した場合に、所定期間、前記共通制御信号の送信を停止するように構成されていることを特徴とする請求項6に記載の無線基地局。
- 前記調整部は、測定した前記共通制御信号の受信電力レベルの所定測定期間における平均値に基づいて、前記共通制御信号の送信電力レベルを調整あおばするように構成されていることを特徴とする請求項6に記載の無線基地局。
- 前記測定部は、予め決められている周波数、タイミング、コードの少なくても1つを用いて、前記周辺無線基地局によって送信された共通制御信号を同定するように構成されていることを特徴とする請求項6に記載の無線基地局。
- 前記調整部は、前記平均値が第1閾値を下回った場合に、前記共通制御信号の送信電力レベルを減少させ、該平均値が第2閾値を上回った場合に、該共通制御信号の送信電力レベルを増加させるように構成されていることを特徴とする請求項8に記載の無線基地局。
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US12/996,508 US8655397B2 (en) | 2008-06-06 | 2009-06-05 | Method of mobile communication for a radio base station |
EP09758431.2A EP2285153A4 (en) | 2008-06-06 | 2009-06-05 | MOBILE COMMUNICATION METHOD AND RADIO BASE STATION |
CN200980121209.0A CN102057710B (zh) | 2008-06-06 | 2009-06-05 | 移动通信方法以及无线基站 |
JP2010515945A JP5174160B2 (ja) | 2008-06-06 | 2009-06-05 | 移動通信方法及び無線基地局 |
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WO2011039958A1 (ja) * | 2009-10-02 | 2011-04-07 | 日本電気株式会社 | 移動通信システム、及びその制御方法、無線基地局装置 |
WO2011101998A1 (en) * | 2010-02-17 | 2011-08-25 | Telefonaktiebolaget L M Ericsson (Publ) | Femto base station, energy-saving coordination node, wireless communication system and computer program |
US9185645B2 (en) | 2009-02-09 | 2015-11-10 | Nec Corporation | Mobile communication system, method of controlling the same, and radio base station apparatus |
WO2016088878A1 (ja) * | 2014-12-04 | 2016-06-09 | ソフトバンク株式会社 | 基地局装置 |
JP2016111715A (ja) * | 2016-01-06 | 2016-06-20 | ソフトバンク株式会社 | 基地局装置 |
EP2579652A4 (en) * | 2010-06-07 | 2017-05-17 | NTT DoCoMo, Inc. | Mobile communication system, base stations and mobile communication method |
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US8792851B2 (en) | 2010-02-17 | 2014-07-29 | Telefonaktiebolaget L M Ericsson (Publ) | Femto base station, energy-saving coordination node, wireless communication system and computer program |
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WO2016088878A1 (ja) * | 2014-12-04 | 2016-06-09 | ソフトバンク株式会社 | 基地局装置 |
US10098130B2 (en) | 2014-12-04 | 2018-10-09 | Softbank Corp. | Base station apparatus for controlling downlink transmission power of a small-cell base station |
JP2016111715A (ja) * | 2016-01-06 | 2016-06-20 | ソフトバンク株式会社 | 基地局装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2009148164A1 (ja) | 2011-11-04 |
EP2285153A4 (en) | 2014-05-28 |
US8655397B2 (en) | 2014-02-18 |
CN102057710B (zh) | 2014-05-28 |
CN102057710A (zh) | 2011-05-11 |
JP5174160B2 (ja) | 2013-04-03 |
EP2285153A1 (en) | 2011-02-16 |
US20110124366A1 (en) | 2011-05-26 |
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