WO2010122738A1 - Cellular communication system, base station of system, and method of controlling power of system - Google Patents
Cellular communication system, base station of system, and method of controlling power of system Download PDFInfo
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- WO2010122738A1 WO2010122738A1 PCT/JP2010/002695 JP2010002695W WO2010122738A1 WO 2010122738 A1 WO2010122738 A1 WO 2010122738A1 JP 2010002695 W JP2010002695 W JP 2010002695W WO 2010122738 A1 WO2010122738 A1 WO 2010122738A1
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- base station
- mobile device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [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]
Definitions
- the present invention relates to a cellular communication system in which a plurality of base stations having cells are provided and a mobile device communicates with a base station in each cell, and in particular, an adjacent base station when a femtocell base station is used. And improvement of interference with mobile equipment.
- a femtocell having a very small range of cells with a radius of several tens of meters has attracted attention.
- a base station having a cell with a radius of several hundred m to several tens of km is provided, and a mobile station communicates with a base station in each cell to construct a macro cell network.
- a macro cell network in a building, an underground shopping center, a tunnel, and the like, there are places where radio wave intensity becomes weak and communication is impossible.
- the femtocell base station has the same function as a normal base station, and can easily secure a communication area of a very small cell. For this reason, if a femtocell base station is installed in a place where communication is impossible in a macrocell network, a communication area can be easily secured (for example, Patent Document 1). In addition, communication volume increases in overpopulated areas and business districts. Even in such a case, a femtocell base station can be arranged to cope with an increase in communication volume.
- Patent Document 1 describes that a base station measures the reception level of a reference signal from a base station in an adjacent cell, obtains a propagation loss value based on this, and performs transmission power control. .
- Patent Document 1 a reception level of a reference signal from a base station of an adjacent cell is measured, a propagation loss value is obtained based on this, and transmission power control is performed. Improve interference problems. However, when a femtocell base station is provided, not only signal interference between base stations but also interference between adjacent cells and mobile devices may occur.
- an object of the present invention is to provide a cellular communication system that can improve interference between a neighboring cell and a mobile device, a base station of the system, and a power control method of the system.
- the present invention provides a cell in which a mobile device is located in a cellular communication system in which a plurality of base stations having cells are provided and the mobile device communicates with a base station in each cell.
- the base station adjacent to the base station has a means for transmitting a reference signal and broadcast information including the transmission level of the reference signal, and the base station of the cell where the mobile station is located transmits from the adjacent base station.
- the reception level of the received reference signal and the reception of broadcast information including the transmission level of the reference signal calculate the propagation loss value based on these, determine the maximum allowable transmission power of the mobile station, and move
- a communication system characterized by comprising means for notifying a mobile station, and the mobile station has means for controlling transmission power in accordance with the notified maximum allowable transmission power.
- the present invention also provides a receiving means for receiving a reference signal from an adjacent base station, broadcast information including the transmission level of the reference signal, and a measuring means for measuring the reception level of the reference signal transmitted from the adjacent base station.
- Mobile unit maximum allowable transmission power determining means for calculating a propagation loss value from a reception level of the reference signal and a transmission level obtained by decoding received broadcast information and determining a maximum allowable transmission power of the mobile device
- a base station for a cellular communication system characterized by comprising: means for notifying a mobile device of the maximum allowable transmission power.
- the base station of the cell where the mobile station is located measures the reception level of the reference signal from the adjacent base station, receives the broadcast information including the transmission level of the reference signal, and performs these operations.
- the propagation loss value is calculated based on this, the maximum allowable transmission power of the mobile device is determined based on this propagation loss value, and the mobile device is notified, and the mobile device determines the transmission power according to the notified maximum allowable transmission power. I try to control it. Thereby, interference from a mobile device to an adjacent base station can be suppressed.
- FIG. 1 shows an outline of the first embodiment of the present invention.
- a base station (apparatus) 11 is a femto base station having a very small range cell 10 with a radius of about several tens of meters, for example.
- the mobile device 22 is located in the cell 10 of the base station 11.
- the base station 21 is a base station (apparatus) adjacent to the base station 11.
- a mobile device 22 located in the cell 10 communicates with the base station 11.
- the signal from the mobile device 22 may reach the cell of the adjacent base station 21 and cause signal interference.
- the base station 11 measures the reception level of the reference signal from the adjacent base station 21 and receives the transmission level notification information, and based on these, the adjacent base station 21 A propagation loss value between the station 21 and the base station 11 is measured. Then, the base station 11 determines the maximum allowable transmission power of the mobile device 22 based on the measured propagation loss value and notifies the mobile device 22 of it. The mobile device 22 receives the maximum allowable transmission power value transmitted from the base station 11 and controls the transmission power. Thereby, signal interference between the mobile station 22 and the adjacent base station 21 can be prevented.
- the base station 11 when the base station 11 is a femtocell base station, the range of the cell 10 is very narrow. Therefore, it can be estimated that the propagation loss value between the adjacent base station 21 and the base station 11 is substantially equal to the propagation loss value between the adjacent base station 21 and the mobile device 22.
- the maximum allowable transmission power of the mobile device 22 can be determined based on the propagation loss value between the adjacent base station 21 and the base station 11 measured on the base station 11 side.
- FIG. 2 shows the configuration of the base station 11 in the first embodiment of the present invention.
- the base station 11 includes a downlink signal receiving unit 12 for receiving a downlink signal of an adjacent base station 21, a propagation loss measuring unit 13 for measuring a propagation loss value of the downlink signal, and a base station 11 includes a mobile device maximum transmission power determination unit 14 that determines the maximum allowable transmission power of the mobile device 22 located in the cell 10 and a base station function unit 15 that manages a base station function of cellular mobile communication.
- the adjacent base station 21 transmits a reference signal. Also, the adjacent base station 21 transmits broadcast information including the transmission level of the reference signal.
- the downlink signal receiving unit 12 of the base station 11 receives the downlink reference signal transmitted by the adjacent base station 21, measures the reception level of the signal, and receives the broadcast information transmitted by the base station 21.
- the transmission level of the reference signal is decoded from the notification signal and notified to the propagation loss measuring unit 13.
- the antenna 17 has an antenna gain equivalent to that of the mobile device 22.
- the propagation loss measuring unit 13 is configured to determine whether the adjacent base station is based on the measured value of the reception level of the reference signal from the adjacent base station 21 received by the downlink signal receiving unit 12 and the transmission level of the reference signal decoded from the broadcast information. The propagation loss from the station 21 to the base station 11 is measured, and the measured value of the propagation loss is notified to the mobile device maximum transmission power determination unit 14.
- the mobile device maximum transmission power determining unit 14 determines the mobile device 22 based on the measured value of the propagation loss received from the propagation loss measuring unit 13 and the allowable interference level to the adjacent base station 21 set in the base station 11. The maximum allowable transmission power of is determined.
- the permissible interference level to adjacent base stations 21 may be received from adjacent base stations 21 via a backhaul (between base stations or a relay network connecting the base stations and the core network).
- the determined maximum allowable transmission power of the mobile device 22 is notified to the base station function unit 15.
- the base station function unit 15 includes a function necessary for a base station for cellular mobile communication, and communicates with the mobile device 22 via the antenna 16.
- the base station function unit 15 has a function of notifying the mobile device 22 of the maximum allowable transmission power of the mobile device determined by the mobile device maximum transmission power determining unit 14 using notification information.
- Other functions are the same as those of known base stations.
- the reception level of the reference signal transmitted from the adjacent base station 21 measured by the downlink signal receiving unit 12 is R (dBm), and the reference decoded from the broadcast signal of the adjacent base station 21 is used.
- the propagation loss between the base station 11 and the adjacent base station 21 and the propagation between the mobile station 22 and the adjacent base station 21 are as follows. Losses can be considered equivalent.
- the base station function unit 15 notifies the mobile device 22 of “Pb ⁇ Pmax” (Pb is an upper limit power) as broadcast information so that the maximum allowable transmission power is set to Pmax.
- Pb is an upper limit power
- other factors that determine the upper limit power Pb are not described.
- the mobile device 22 performs transmission power control with the upper limit power Pb as an upper limit, it is possible to suppress interference with adjacent cells.
- the reception level measurement of the reference signal from the adjacent base station 21 and the reception of the broadcast information including the transmission level of the reference signal are performed.
- a propagation loss value is calculated, and based on this propagation loss value, the maximum allowable transmission power of the mobile device 22 in the cell 10 is determined and notified to the mobile device 22. Thereby, interference from the mobile device 22 to an adjacent cell can be suppressed.
- the base station of the cell where the mobile station is located measures the reception level of the reference signal from the adjacent base station, receives the broadcast information including the transmission level of the reference signal, and performs these operations. Based on this propagation loss value, the maximum allowable transmission power of the mobile device is determined and notified to the mobile device, and the mobile device controls the transmission power according to the notified maximum allowable transmission power. Therefore, interference from the mobile device to the adjacent base station can be suppressed.
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Abstract
Description
本発明は、セルを有する複数の基地局を設け、移動機が各セル内の基地局と通信を行うセルラー方式の通信システムに関するもので、特に、フェムトセル基地局を用いた場合の隣接基地局と移動機との干渉の改善に関する。
本願は、２００９年４月２３日に出願された特願２００９－１０４９１２号に基づき優先権を主張し、その内容をここに援用する。
The present invention relates to a cellular communication system in which a plurality of base stations having cells are provided and a mobile device communicates with a base station in each cell, and in particular, an adjacent base station when a femtocell base station is used. And improvement of interference with mobile equipment.
This application claims priority based on Japanese Patent Application No. 2009-104912 filed on Apr. 23, 2009, the contents of which are incorporated herein by reference.
近年、半径数十ｍ程度のきわめて小さな範囲のセルを有するフェムトセル（femtocell）が注目されている。すなわち、現状のセルラー通信システムでは、半径数百ｍ～十数ｋｍのセルを有する基地局を設けて、移動機が各セル内の基地局と通信を行うようにして、マクロセル・ネットワークを構築している。しかしながら、このようなマクロセル・ネットワークでは、ビルの中、地下街、トンネル等では、電波強度が微弱となり、通信不能になる場所が生じてくる。 In recent years, a femtocell having a very small range of cells with a radius of several tens of meters has attracted attention. In other words, in the current cellular communication system, a base station having a cell with a radius of several hundred m to several tens of km is provided, and a mobile station communicates with a base station in each cell to construct a macro cell network. ing. However, in such a macro cell network, in a building, an underground shopping center, a tunnel, and the like, there are places where radio wave intensity becomes weak and communication is impossible.
フェムトセル基地局は、通常の基地局と同様の機能を有し、きわめて小さなセルの通信エリアを簡単に確保できる。このため、マクロセル・ネットワークでは通信不能になる場所に、フェムトセル基地局を設置すれば、通信エリアを容易に確保できる（例えば特許文献１）。また、人口過密地域や、ビジネス街では、通信量が増大する。このような場合にも、フェムトセル基地局を配置して、通信量の増大に対処できる。 The femtocell base station has the same function as a normal base station, and can easily secure a communication area of a very small cell. For this reason, if a femtocell base station is installed in a place where communication is impossible in a macrocell network, a communication area can be easily secured (for example, Patent Document 1). In addition, communication volume increases in overpopulated areas and business districts. Even in such a case, a femtocell base station can be arranged to cope with an increase in communication volume.
このように、フェムトセルは、通信エリアの確保と通信量の増大に容易に対応できる。ところが、フェムトセル基地局が設置されると、セル間での干渉の問題が生じてくる可能性がある。そこで、例えば特許文献１には、基地局では、隣接セルの基地局からの基準信号の受信レベルを測定し、これを基に伝搬損失値を求め、送信電力制御を行うことが記載されている。 Thus, the femtocell can easily cope with securing a communication area and increasing the amount of communication. However, when a femtocell base station is installed, there may be a problem of interference between cells. Thus, for example, Patent Document 1 describes that a base station measures the reception level of a reference signal from a base station in an adjacent cell, obtains a propagation loss value based on this, and performs transmission power control. .
特許文献１に示されているように、隣接セルの基地局からの基準信号の受信レベルを測定し、これを基に伝搬損失値を求め、送信電力制御を行うことで、基地局間での干渉の問題を改善できる。しかしながら、フェムトセル基地局を設けた場合には、基地局間での信号の干渉のみならず、隣接セルと移動機との干渉が生じる可能性がある。 As shown in Patent Document 1, a reception level of a reference signal from a base station of an adjacent cell is measured, a propagation loss value is obtained based on this, and transmission power control is performed. Improve interference problems. However, when a femtocell base station is provided, not only signal interference between base stations but also interference between adjacent cells and mobile devices may occur.
上述の課題を鑑み、本発明は、隣接セルと移動機との干渉を改善できるセルラー方式の通信システム、該システムの基地局、及び該システムの電力制御方法を提供することを目的とする。 In view of the above problems, an object of the present invention is to provide a cellular communication system that can improve interference between a neighboring cell and a mobile device, a base station of the system, and a power control method of the system.
上述の課題を解決するために、本発明は、セルを有する複数の基地局を設け、移動機が各セル内の基地局と通信を行うセルラー方式の通信システムにおいて、移動機が在圏するセルの基地局に隣接する基地局は、基準信号と、当該基準信号の送信レベルを含む報知情報を送信する手段を有し、移動機が在圏するセルの基地局は、隣接する基地局から送信される基準信号の受信レベルの測定と、当該基準信号の送信レベルを含む報知情報の受信とを行い、これらを基に伝搬損失値を算出し、移動機の最大許容送信電力を決定して移動機に通知する手段を有し、移動機は、通知された最大許容送信電力に応じて、送信電力を制御する手段を有することを特徴とする通信システムを提供する。 In order to solve the above-described problem, the present invention provides a cell in which a mobile device is located in a cellular communication system in which a plurality of base stations having cells are provided and the mobile device communicates with a base station in each cell. The base station adjacent to the base station has a means for transmitting a reference signal and broadcast information including the transmission level of the reference signal, and the base station of the cell where the mobile station is located transmits from the adjacent base station. The reception level of the received reference signal and the reception of broadcast information including the transmission level of the reference signal, calculate the propagation loss value based on these, determine the maximum allowable transmission power of the mobile station, and move There is provided a communication system characterized by comprising means for notifying a mobile station, and the mobile station has means for controlling transmission power in accordance with the notified maximum allowable transmission power.
本発明はまた、隣接する基地局からの基準信号と、当該基準信号の送信レベルを含む報知情報を受信する受信手段と、隣接する基地局から送信される基準信号の受信レベルを測定する測定手段と、該基準信号の受信レベルと、受信した報知情報を復号して得られた送信レベルとから伝搬損失値を算出し、移動機の最大許容送信電力を決定する移動機最大許容送信電力決定手段と、該最大許容送信電力を移動機に通知する手段とを備えることを特徴とするセルラー方式の通信システムの基地局を提供する。 The present invention also provides a receiving means for receiving a reference signal from an adjacent base station, broadcast information including the transmission level of the reference signal, and a measuring means for measuring the reception level of the reference signal transmitted from the adjacent base station. Mobile unit maximum allowable transmission power determining means for calculating a propagation loss value from a reception level of the reference signal and a transmission level obtained by decoding received broadcast information and determining a maximum allowable transmission power of the mobile device And a base station for a cellular communication system, characterized by comprising: means for notifying a mobile device of the maximum allowable transmission power.
本発明によれば、移動機が在圏するセルの基地局は、隣接する基地局からの基準信号の受信レベル測定と、当該基準信号の送信レベルを含む報知情報の受信とを行い、これらを基に伝搬損失値を算出し、この伝搬損失値により、移動機の最大許容送信電力を決定し、移動機に通知し、移動機は、通知された最大許容送信電力に応じて、送信電力を制御するようにしている。これにより、移動機から隣接する基地局への干渉を抑制することができる。 According to the present invention, the base station of the cell where the mobile station is located measures the reception level of the reference signal from the adjacent base station, receives the broadcast information including the transmission level of the reference signal, and performs these operations. The propagation loss value is calculated based on this, the maximum allowable transmission power of the mobile device is determined based on this propagation loss value, and the mobile device is notified, and the mobile device determines the transmission power according to the notified maximum allowable transmission power. I try to control it. Thereby, interference from a mobile device to an adjacent base station can be suppressed.
以下、本発明の実施の形態について図面を参照しながら説明する。本発明は、フェムトセル基地局を含むセルラー方式の通信システムに適用できる。
図１は、本発明の第１の実施形態の概要を示すものである。図１において、基地局（装置）１１は、例えば半径数十ｍ程度のきわめて小さな範囲のセル１０を有するフェムト基地局である。
移動機２２は、基地局１１のセル１０内に位置している。
基地局２１は、基地局１１に隣接する基地局（装置）である。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention can be applied to a cellular communication system including a femtocell base station.
FIG. 1 shows an outline of the first embodiment of the present invention. In FIG. 1, a base station (apparatus) 11 is a femto base station having a very
The
The
セル１０内に在圏する移動機２２は、基地局１１と通信を行っている。
ここで、移動機２２の送信電力が大きいと、移動機２２からの信号が隣接する基地局２１のセルに届き、信号の干渉を生じさせる可能性がある。
A
Here, if the transmission power of the
そこで、本発明の第１の実施形態では、基地局１１は、隣接する基地局２１からの基準信号の受信レベルの測定と送信レベル報知情報の受信とを行い、これらを基に、隣接する基地局２１と基地局１１との間の伝搬損失値を測定している。そして、基地局１１は、測定した伝搬損失値に基づいて移動機２２の最大許容送信電力を決定し、移動機２２に通知している。
移動機２２は、基地局１１から送られてきた最大許容送信電力値を受信して、送信電力を制御している。これにより、移動機２２と隣接する基地局２１との信号の干渉が防止できる。
Therefore, in the first embodiment of the present invention, the
The
すなわち、基地局１１がフェムトセル基地局の場合には、セル１０の範囲は非常に狭い。よって、隣接する基地局２１と基地局１１との間の伝搬損失値は、隣接する基地局２１と移動機２２との間の伝搬損失値と略々等しいと推定できる。
このことから、基地局１１側で測定した隣接する基地局２１と基地局１１との間の伝搬損失値に基づいて、移動機２２の最大許容送信電力を決定できる。
That is, when the
Thus, the maximum allowable transmission power of the
図２は、本発明の第１の実施形態における基地局１１の構成を示すものである。
図２に示すように、基地局１１は、隣接する基地局２１の下り信号を受信するための下り信号受信部１２と、下り信号の伝搬損失値を測定する伝搬損失測定部１３と、基地局１１のセル１０に在圏する移動機２２の最大許容送信電力を決定する移動機最大送信電力決定部１４と、セルラー方式の移動体通信の基地局機能を司る基地局機能部１５からなる。
FIG. 2 shows the configuration of the
As shown in FIG. 2, the
隣接する基地局２１は、基準信号を送信している。また、隣接する基地局２１は、当該基準信号の送信レベルを含む報知情報を送信している。
基地局１１の下り信号受信部１２は、隣接する基地局２１が送信した下りの基準信号を受信し、当該信号の受信レベルを測定し、また、当該基地局２１が送信した報知情報を受信し、この報知信号から当該基準信号の送信レベルを復号し、伝搬損失測定部１３に対して通知する。
アンテナ１７は、移動機２２と同等のアンテナゲインを持っている。
The
The downlink
The
伝搬損失測定部１３は、下り信号受信部１２で受信した隣接する基地局２１からの基準信号の受信レベルの測定値と、報知情報から復号した当該基準信号の送信レベルを基に、隣接する基地局２１から自基地局１１までの伝搬損失を測定し、この伝搬損失の測定値を移動機最大送信電力決定部１４に対して通知する。
The propagation
移動機最大送信電力決定部１４は、伝搬損失測定部１３から受けた伝搬損失の測定値と、基地局１１に設定された、隣接する基地局２１への干渉許容レベルを基に、移動機２２の最大許容送信電力を決定する。
隣接する基地局２１への干渉許容レベルは、バックホール（基地局間や基地局とコアネットワークを接続する中継用ネットワーク）などを介して、隣接する基地局２１から受信しても良い。
決定した移動機２２の最大許容送信電力は、基地局機能部１５に対して通知される。
The mobile device maximum transmission
The permissible interference level to
The determined maximum allowable transmission power of the
基地局機能部１５は、セルラー方式の移動体通信の基地局に必要な機能を備えており、アンテナ１６を介して、移動機２２と通信を行う。
基地局機能部１５は、移動機最大送信電力決定部１４にて決定した、移動機の最大許容送信電力を報知情報にて、移動機２２に通知する機能を有する。その他の機能については、既知の基地局の機能と同等である。
The base
The base
次に、本発明の第１の実施形態の動作について説明する。
図２を参照すると、下り信号受信部１２が測定した、隣接する基地局２１から送信された基準信号の受信レベルをＲ（ｄＢｍ）とし、また、隣接する基地局２１の報知信号から復号した基準信号の送信レベルをＲ０（ｄＢｍ）とすると、伝搬損失測定部１３では、伝搬損失の測定値を、ＰＬ＝Ｒ０－Ｒ（ｄＢｍ）のように決定する。
Next, the operation of the first embodiment of the present invention will be described.
Referring to FIG. 2, the reception level of the reference signal transmitted from the
上述のように、フェムトセルのような微小なセル半径を持つセルでは、基地局１１と隣接する基地局２１との間の伝搬損失と、移動機２２と隣接する基地局２１との間の伝搬損失は同等であると見なすことができる。
As described above, in a cell having a small cell radius such as a femto cell, the propagation loss between the
移動機最大送信電力決定部１４では、手動で設定された、または、バックホールを介して隣接セルから受信した、隣接する基地局２１への干渉許容レベルをＩ（ｄＢｍ）とすると、自セルに在圏する移動機２２の最大許容送信電力として、Ｐｍａｘ＝Ｉ＋ＰＬ（ｄＢｍ）を決定し、基地局機能部１５に対して通知する。
In the mobile station maximum transmission
基地局機能部１５では、移動機２２に対し、最大許容送信電力をこのＰｍａｘとするように、報知情報として「Ｐｂ≦Ｐｍａｘ」（Ｐｂは上限電力）を移動機２２に通知する。なお、ここでは、上限電力Ｐｂを決める他の要因については述べない。
移動機２２が、この上限電力Ｐｂを上限として送信電力制御を行うことによって、隣接するセルに対する干渉を抑制することが可能となる。
The base
When the
上述のように、本発明の第１の実施形態では、隣接する基地局２１からの基準信号の受信レベル測定と、当該基準信号の送信レベルを含む報知情報の受信とを行い、これらを基に伝搬損失値を算出し、この伝搬損失値により、セル１０内の移動機２２の最大許容送信電力を決定し、移動機２２に通知するようにしている。これにより、移動機２２から隣接するセルへの干渉を抑制することができる。
As described above, in the first embodiment of the present invention, the reception level measurement of the reference signal from the
本発明は、上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内で様々な変形や応用が可能である。 The present invention is not limited to the above-described embodiment, and various modifications and applications are possible without departing from the spirit of the present invention.
本発明によれば、移動機が在圏するセルの基地局は、隣接する基地局からの基準信号の受信レベル測定と、当該基準信号の送信レベルを含む報知情報の受信とを行い、これらを基に伝搬損失値を算出し、この伝搬損失値により、移動機の最大許容送信電力を決定して移動機に通知し、移動機は、通知された最大許容送信電力に応じて送信電力を制御するので、移動機から隣接する基地局への干渉を抑制することができる。 According to the present invention, the base station of the cell where the mobile station is located measures the reception level of the reference signal from the adjacent base station, receives the broadcast information including the transmission level of the reference signal, and performs these operations. Based on this propagation loss value, the maximum allowable transmission power of the mobile device is determined and notified to the mobile device, and the mobile device controls the transmission power according to the notified maximum allowable transmission power. Therefore, interference from the mobile device to the adjacent base station can be suppressed.
１０ セル１１ 基地局
１２ 下り信号受信部
１３ 伝搬損失測定部
１４ 移動機最大送信電力決定部
１５ 基地局機能部
１６ アンテナ
１７ アンテナ
２１ 隣接する基地局
２２ 移動機
10
Claims (4)
移動機が在圏するセルの基地局に隣接する基地局は、基準信号と、当該基準信号の送信レベルを含む報知情報を送信する手段を有し、
前記移動機が在圏するセルの基地局は、前記隣接する基地局から送信される基準信号の受信レベルの測定と、前記報知情報の受信とを行い、これらを基に伝搬損失値を算出し、前記移動機の最大許容送信電力を決定して前記移動機に通知する手段を有し、
前記移動機は、前記通知された最大許容送信電力に応じて、送信電力を制御する手段を有する
ことを特徴とする通信システム。 In a cellular communication system in which a plurality of base stations having cells are provided and a mobile device communicates with a base station in each cell,
The base station adjacent to the base station of the cell where the mobile station is located has means for transmitting the reference signal and broadcast information including the transmission level of the reference signal,
The base station of the cell where the mobile station is located measures the reception level of the reference signal transmitted from the adjacent base station and receives the broadcast information, and calculates the propagation loss value based on these measurements. A means for determining the maximum allowable transmission power of the mobile device and notifying the mobile device;
The mobile device has means for controlling transmission power according to the notified maximum allowable transmission power.
前記隣接する基地局から送信される基準信号の受信レベルを測定する測定手段と、
前記基準信号の受信レベルと、前記受信した報知情報を復号して得られた送信レベルとから伝搬損失値を算出し、前記移動機の最大許容送信電力を決定する移動機最大許容送信電力決定手段と、
前記最大許容送信電力を前記移動機に通知する手段と
を備えることを特徴とするセルラー方式の通信システムの基地局。 Receiving means for receiving a reference signal from an adjacent base station and broadcast information including a transmission level of the reference signal;
Measuring means for measuring a reception level of a reference signal transmitted from the adjacent base station;
A mobile device maximum allowable transmission power determining means for calculating a propagation loss value from the reception level of the reference signal and the transmission level obtained by decoding the received broadcast information and determining the maximum allowable transmission power of the mobile device When,
Means for notifying the mobile station of the maximum allowable transmission power. A base station of a cellular communication system.
移動機が在圏するセルの基地局に隣接する基地局は、基準信号と、当該基準信号の送信レベルを含む報知情報を送信し、
前記移動機が在圏するセルの基地局は、前記隣接する基地局から送信される基準信号の受信レベルの測定と、前記報知情報の受信とを行い、これらを基に伝搬損失値を算出し、前記移動機の最大許容送信電力を決定して前記移動機に通知し、
前記移動機は、前記通知された最大許容送信電力に応じて、送信電力を制御する
ことを特徴とするセルラー方式の通信システムの電力制御方法。 In a power control method for a cellular communication system in which a plurality of base stations having cells are provided and a mobile device communicates with a base station in each cell,
The base station adjacent to the base station of the cell where the mobile station is located transmits a reference signal and broadcast information including the transmission level of the reference signal,
The base station of the cell where the mobile station is located measures the reception level of the reference signal transmitted from the adjacent base station and receives the broadcast information, and calculates the propagation loss value based on these measurements. Determining the maximum allowable transmission power of the mobile device and notifying the mobile device;
The mobile device controls transmission power according to the notified maximum allowable transmission power. A power control method for a cellular communication system.
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| WO2008093100A2 (en) * | 2007-02-02 | 2008-08-07 | Ubiquisys Limited | A method and base station to control access point transmit power |
| WO2010061626A1 (en) * | 2008-11-28 | 2010-06-03 | パナソニック株式会社 | Radio communication base station device and transmission power control method |
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| WO2008093100A2 (en) * | 2007-02-02 | 2008-08-07 | Ubiquisys Limited | A method and base station to control access point transmit power |
| WO2010061626A1 (en) * | 2008-11-28 | 2010-06-03 | パナソニック株式会社 | Radio communication base station device and transmission power control method |
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