JP2003115793A - Cdma radio base station equipment - Google Patents

Cdma radio base station equipment

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Publication number
JP2003115793A
JP2003115793A JP2001309817A JP2001309817A JP2003115793A JP 2003115793 A JP2003115793 A JP 2003115793A JP 2001309817 A JP2001309817 A JP 2001309817A JP 2001309817 A JP2001309817 A JP 2001309817A JP 2003115793 A JP2003115793 A JP 2003115793A
Authority
JP
Japan
Prior art keywords
unit
signal
transmission
reception
transmitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001309817A
Other languages
Japanese (ja)
Other versions
JP2003115793A5 (en
Inventor
Toru Sasayama
徹 笹山
Original Assignee
Hitachi Kokusai Electric Inc
株式会社日立国際電気
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Kokusai Electric Inc, 株式会社日立国際電気 filed Critical Hitachi Kokusai Electric Inc
Priority to JP2001309817A priority Critical patent/JP2003115793A/en
Publication of JP2003115793A publication Critical patent/JP2003115793A/en
Publication of JP2003115793A5 publication Critical patent/JP2003115793A5/ja
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a CDMA base station equipment with which the cost and size of the station can be reduced by eliminating the need for a large scale compensation circuit for removing intermodulation distortion incident to 2 carrier signal being inputted to a transmitting/amplifying section, and eliminating a distributor and a combiner for operating two transmitting/amplifying sections in parallel. SOLUTION: In the CDMA base station equipment for transmitting/receiving a plurality of RF signal, each of a plurality of transmitting/amplifying sections is arranged and connected with each of a plurality of frequency converting sections thus amplifying only one of the plurality of RF signals. Output from each of the plurality of transmitting/amplifying sections is arranged and distributed to the plurality of frequency converting sections.

Description

【発明の詳細な説明】 【0001】 【発明の属する技術分野】本発明は、符号分割多元接続
方式(以下CDMAと略称する)の移動通信システムに
おける無線基地局装置に関する。 【0002】 【従来の技術】従来のCDMA無線基地局装置の構成を
図3に示す。RF信号の送受信を行うアンテナ部101
と、送信RF信号及び受信RF信号を増幅する送受信増
幅部102と、ベースバンド信号を送信RF信号に変換
し送受信増幅部102からの受信RF信号をベースバン
ド信号に変換する周波数変換部103と、ベースバンド
信号処理を行うベースバンド部104と、無線ネットワ
ーク制御装置(RNC:Radio Network Controller)1
06との制御信号の送受信を行い無線回線管理などを行
う無線基地局制御部107と、ベースバンド部104と
有線伝送路108とのデータの変換などを行う有線伝送
路インターフェイス部105とを有する。 【0003】この基地局装置のうち、アンテナ部101
と送受信増幅部102と周波数変換部103に関して図
4に構成の1例を示す。RF信号の送受信を行うアンテ
ナ部201,202と、送受信それぞれのRF信号のア
ンテナ部201,202との結合と帶域制限をすデュプ
レクサ部203及びフィルタ部204と、送信信号を増
幅する送信増幅部205,206と、受信RF信号を増
幅する受信増幅部207,208と、送受信信号の周波
数変換を行う周波数変換部209,210と、信号の分
配及び合成を行う分配合成部211,212,213,
214,215を有する。この例では、使用する無線キ
ャリア数を2とし、周波数変換部209,210でそれ
ぞれ周波数F1と周波数F2に対応して周波数変換を行
っている。 【0004】次にこの動作を説明する。始めに、受信信
号の流れを説明する。受信系は2本のアンテナ201,
202を用いたダイバーシチ合成を行うために2系統持
っており、それぞれのアンテナからデュプレクサ20
3,受信フィルタ204により帶域制限をかけてから受
信増幅部207,208によって増幅され、それぞれ分
配器214,215により分配されて周波数変換部20
9,210に入力される。 【0005】次に、送信信号の流れを説明する。周波数
F1用及び周波数F2用のベースバンド信号はそれぞれ
周波数変換部209,周波数変換部210により無線周
波数に変換された後、合成部213により合成されて送
信増幅部205,206に送られる。この場合の送信増
幅部205,206は冗長構成をとっており2台の増幅
部を並列に動作させている。すなわち、分配器212で
分配された後送信増幅部205と、送信増幅部206と
により増幅され、合成器211により合成される。この
構成の場合、送信増幅部205,206のどちらかが故
障してもゲインが低下するだけでシステムダウンにはな
らない。合成された信号はデュプレクサ203により帶
域制限された後アンテナ201から送出される。 【0006】 【発明が解決しようとする課題】この従来構成において
は、送信増幅部205,206には2つのキャリア信号
が同時に入力されるため、相互変調歪みが発生し、この
歪み成分を除去するための大がかりな歪み補償回路を必
要とし、コスト高や装置サイズ及び消費電力の増大につ
ながっていた。また、送信増幅部を冗長構成とするため
に2台並列運転としているため、分配器及び合成器が必
要となり、これらもコスト高や装置サイズの増大につな
がっていた。 【0007】本発明の目的は、従来技術の問題点であっ
た送信増幅部に2キャリアの信号が入力されるために生
じる相互変調歪みを除去するための大がかりな歪み補償
回路を必要とせず、送信増幅部を2台並列運転するため
の分配器及び合成器を排除し、コストや装置サイズの低
減をはかれるCDMA無線基地局装置を提供することに
ある。 【0008】 【課題を解決するための手段】この課題を解決するため
に、本発明によるCDMA無線基地局装置は、複数のR
F信号を送受信するCDMA無線基地局装置であって、
RF信号の送受信を行うアンテナ部と、送信RF信号及
び受信RF信号を増幅する送受信増幅部と、ベースバン
ド信号を前記送信RF信号に変換し前記増幅された受信
RF信号をベースバンド信号に変換する周波数変換部
と、ベースバンド信号処理を行うベースバンド部と、移
動通信制御局との制御信号の送受信を行い無線回線管理
などを行う無線基地局制御部と、前記ベースバンド部と
有線伝送路とのデータの変換を行う有線伝送路インター
フェイス部とを備え、前記アンテナ部と前記送受信増幅
部と前記周波数変換部とは、前記複数のRF信号を送受
信するためにおのおの複数個が配置され、前記複数個の
送受信増幅部の各送信部増幅部は、前記複数個の周波数
変換部の各周波数変換部毎に個別に配置接続されて前記
複数のRF信号のうちの対応する一つのRF信号のみを
増幅させる構成とされ、前記送受信増幅部の各受信部増
幅部の増幅出力は、前記複数個の前記周波数変換部に分
配供給される構成とされている。 【0009】 【発明の実施の形態】本発明の構成例を図1に示す。R
F信号の送受信を行うアンテナ部101と、送信RF信
号を増幅する送信増幅部102aと、受信RF信号を増
幅する受信増幅部102bと、ベースバンド信号をRF
信号に変換する周波数変換部103aと、受信増幅部1
02bからのRF信号をベースバンド信号に変換する周
波数変換部103bと、ベースバンド信号処理を行うベ
ースバンド部104と、無線ネットワーク制御装置(R
NC)106との制御信号の送受信を行い、無線回線管
理などを行う無線基地局制御部107と、ベースバンド
部104と有線伝送路108とのデータの変換などを行
う有線伝送路インターフェイス部105とを有する。 【0010】本発明は、従来2キャリアの信号を合成し
た信号を増幅していた送信増幅部102を周波数変換部
103a,103b毎に増幅させる構成としたことを特
徴とする。 【0011】次にアンテナ部と送受信増幅部と周波数変
換部に関して図2に構成の一例を示す。RF信号の送受
信を行うアンテナ部201,202と、送受信それぞれ
のRF信号に帶域制限をかけるデュプレクサ部203,
401と、送信信号を増幅する送信増幅部205,20
6と、受信信号を増幅する受信増幅部207,208
と、送受信信号の周波数変換を行う周波数変換部20
9,210と、信号の分配を行う分配部214,215
を有する。従来技術と比較して、送信増幅部が各周波数
変換部及びデュプレクサと直接に接続されている。 【0012】次にこの動作を説明する。受信信号の流れ
は図4に示した従来技術と同様である。次に送信信号の
流れを説明する。周波数F1用のベースバンド信号は周
波数変換部209により無線周波数に変換された後、送
信増幅部205に送られる。この送信増幅部205によ
り増幅された信号はデュプレクサ203により帶域制限
された後アンテナ201から送出される。周波数F2の
場合には、周波数変換部210により無線周波数に変換
された後、送信増幅部206に送られる。この送信増幅
部206により増幅された信号はデュプレクサ401に
より帶域制限された後アンテナ202から送出される。 【0013】このような構成とすることで、各送信増幅
部205,206には1キャリア分の信号だけが入力さ
れることになり、相互変調歪みが発生せず大規模な歪み
補償回路を軽減することができ、コスト,装置サイズ及
び消費電力の低減が可能になる。また、従来の歪み補償
回路を用いた場合、同一のコスト及びサイズでより大電
力を出力することが可能になり高効率化が可能となる。
また、従来構成において冗長構成として送信増幅部を並
列運転させるために用いた分配合成器が不要となり、コ
ストや装置サイズの低減が可能となる。この分配合成器
の損失も無くなることから低消費電力にも貢献すること
ができる。冗長構成については、送信増幅部の片側(例
えば205)が故障した場合、対応する周波数変換部
(209)の送信側も使用できなくなるため収容チャネ
ル数は減少するが、もう一方(206)は出力低下も無
しで動作させることができるため、サービスエリアを確
保することができ、従来技術以上の効果を期待すること
ができる。 【0014】ここで説明した例では、1セル1セクタ方
式での実施例であるが、セクタ毎に本発明を適用するこ
とで1セル多セクタの基地局においても適用可能であ
る。この場合セクタ毎に従来技術と本発明を使い分けて
も良い。 【0015】 【発明の効果】以上詳細に説明したように、本発明によ
れば、送信増幅部には1キャリア分の信号だけが入力さ
れることになり、相互変調歪みが発生せず大規模な補償
回路を軽減することができ、コスト,装置サイズ及び消
費電力の低減が可能になる。また、従来の歪み補償回路
を用いた場合、同一のコスト及びサイズでより大電力を
出力することが可能になり高効率化が可能となる。ま
た、従来構成において冗長構成として増幅部を並列運転
させるために用いた分配合成器が不要となり、コストや
装置サイズの軽減が可能となる。この分配合成器の損失
も無くなることから低消費電力にも貢献することができ
る。冗長構成については、送信増幅部の片側が故障した
場合、対応する周波数変換部の送信側も使用できなくな
るため収容チャネル数は減少するが、もう一方は出力低
下も無しで動作できるためサービスエリアを確保でき、
従来技術以上の効果を期待することが可能である。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio base station apparatus in a code division multiple access (hereinafter abbreviated as CDMA) mobile communication system. FIG. 3 shows a configuration of a conventional CDMA radio base station apparatus. Antenna unit 101 for transmitting and receiving RF signals
A transmission / reception amplification unit 102 that amplifies a transmission RF signal and a reception RF signal, a frequency conversion unit 103 that converts a baseband signal into a transmission RF signal, and converts a reception RF signal from the transmission / reception amplification unit 102 into a baseband signal, Baseband section 104 for performing baseband signal processing and radio network controller (RNC: Radio Network Controller) 1
A wireless base station control unit 107 performs transmission and reception of control signals to and from the base station 06 to perform wireless line management and the like, and a wired transmission line interface unit 105 that performs data conversion between the baseband unit 104 and the wired transmission line 108. In this base station apparatus, an antenna unit 101
FIG. 4 shows an example of the configuration of the transmission / reception amplification unit 102 and the frequency conversion unit 103. Antenna units 201 and 202 for transmitting and receiving RF signals, a duplexer unit 203 and a filter unit 204 for coupling the RF signals to the antenna units 201 and 202 for transmission and reception and band limiting, and a transmission amplifying unit for amplifying the transmission signal 205, 206; reception amplifiers 207, 208 for amplifying a received RF signal; frequency converters 209, 210 for frequency conversion of transmission / reception signals; and distribution / synthesis units 211, 212, 213 for distribution and synthesis of signals.
214, 215. In this example, the number of wireless carriers to be used is set to 2, and the frequency conversion units 209 and 210 perform frequency conversion corresponding to the frequencies F1 and F2, respectively. Next, this operation will be described. First, the flow of the received signal will be described. The receiving system has two antennas 201,
In order to perform diversity combining using the antenna 202, two systems are provided.
3. After the band is limited by the reception filter 204, the signal is amplified by the reception amplifiers 207 and 208, and is distributed by the distributors 214 and 215, respectively.
9, 210. Next, the flow of a transmission signal will be described. The baseband signals for the frequency F1 and the frequency F2 are converted into radio frequencies by the frequency conversion unit 209 and the frequency conversion unit 210, respectively, then synthesized by the synthesis unit 213, and sent to the transmission amplification units 205 and 206. In this case, the transmission amplifiers 205 and 206 have a redundant configuration, and operate two amplifiers in parallel. That is, the signal is distributed by the distributor 212, amplified by the transmission amplifier 205 and the transmission amplifier 206, and combined by the combiner 211. In the case of this configuration, even if one of the transmission amplifiers 205 and 206 fails, only the gain is reduced and the system does not go down. The combined signal is transmitted from the antenna 201 after band limitation by the duplexer 203. In this conventional configuration, two carrier signals are simultaneously input to the transmission amplifiers 205 and 206, so that intermodulation distortion occurs, and this distortion component is removed. Therefore, a large-scale distortion compensating circuit is required, leading to an increase in cost, an increase in device size, and an increase in power consumption. In addition, since two transmission amplifiers are operated in parallel in order to have a redundant configuration, a distributor and a combiner are required, which also leads to an increase in cost and an increase in device size. An object of the present invention is to eliminate the need for a large-scale distortion compensating circuit for removing intermodulation distortion caused by input of a two-carrier signal to a transmission amplifier, which is a problem of the prior art. An object of the present invention is to provide a CDMA radio base station apparatus which eliminates a distributor and a combiner for operating two transmission amplifiers in parallel and reduces cost and apparatus size. [0008] In order to solve this problem, a CDMA radio base station apparatus according to the present invention comprises a plurality of R
A CDMA radio base station apparatus for transmitting and receiving an F signal,
An antenna unit for transmitting and receiving an RF signal; a transmission and reception amplifying unit for amplifying a transmission RF signal and a reception RF signal; and converting a baseband signal to the transmission RF signal and converting the amplified reception RF signal to a baseband signal. A frequency conversion unit, a baseband unit that performs baseband signal processing, a radio base station control unit that performs transmission and reception of control signals with a mobile communication control station and performs radio line management and the like, and the baseband unit and a wired transmission path. A wired transmission line interface unit that performs data conversion, wherein the antenna unit, the transmission / reception amplification unit, and the frequency conversion unit are each provided with a plurality of units for transmitting and receiving the plurality of RF signals. The transmitting / receiving amplifying sections of the transmitting / receiving amplifying sections are individually arranged and connected for each of the frequency converting sections of the plurality of frequency converting sections, and receive the plurality of RF signal packets. The corresponding is a configuration in which only the amplification one RF signal, amplifies the output of the receiver amplifier of the transceiver amplifying unit is configured to be distributed to the frequency converter of the plurality. FIG. 1 shows a configuration example of the present invention. R
An antenna unit 101 for transmitting and receiving an F signal; a transmission amplification unit 102a for amplifying a transmission RF signal; a reception amplification unit 102b for amplifying a reception RF signal;
A frequency conversion unit 103a for converting the signal into a signal;
02b, a frequency conversion unit 103b that converts the RF signal from the baseband signal into a baseband signal, a baseband unit 104 that performs baseband signal processing, and a radio network controller (R
(NC) 106 for transmitting and receiving control signals to and from the base station control unit 107 for performing radio line management and the like; a wired transmission line interface unit 105 for performing data conversion between the baseband unit 104 and the wired transmission line 108; Having. The present invention is characterized in that the transmission amplifying unit 102, which conventionally amplifies a signal obtained by combining two carrier signals, is amplified for each of the frequency conversion units 103a and 103b. FIG. 2 shows an example of the configuration of the antenna unit, the transmission / reception amplification unit, and the frequency conversion unit. Antenna units 201 and 202 for transmitting and receiving RF signals, and duplexer units 203 and 202 for band-limiting each RF signal for transmission and reception.
401, transmission amplification units 205 and 20 for amplifying transmission signals
6 and reception amplification units 207 and 208 for amplifying the reception signal
And a frequency conversion unit 20 for performing frequency conversion of transmission and reception signals
9, 210, and distribution units 214, 215 for distributing signals
Having. Compared with the prior art, the transmission amplification unit is directly connected to each frequency conversion unit and the duplexer. Next, this operation will be described. The flow of the received signal is the same as in the prior art shown in FIG. Next, the flow of a transmission signal will be described. The baseband signal for the frequency F1 is converted to a radio frequency by the frequency conversion unit 209, and then sent to the transmission amplification unit 205. The signal amplified by the transmission amplification unit 205 is band-limited by the duplexer 203 and then transmitted from the antenna 201. In the case of the frequency F2, the frequency is converted to a radio frequency by the frequency conversion unit 210 and then transmitted to the transmission amplification unit 206. The signal amplified by the transmission amplifier 206 is band-limited by the duplexer 401 and then transmitted from the antenna 202. With such a configuration, only one carrier signal is input to each of the transmission amplifiers 205 and 206, so that no intermodulation distortion occurs and a large-scale distortion compensation circuit is reduced. And cost, device size, and power consumption can be reduced. In addition, when the conventional distortion compensation circuit is used, it is possible to output higher power at the same cost and size, and to achieve higher efficiency.
Further, in the conventional configuration, as a redundant configuration, a distributor / synthesizer used for operating the transmission amplifiers in parallel is not required, so that cost and device size can be reduced. Since the loss of the divider / combiner is also eliminated, it is possible to contribute to low power consumption. Regarding the redundant configuration, if one side (for example, 205) of the transmission amplification unit fails, the transmission side of the corresponding frequency conversion unit (209) cannot be used, so that the number of accommodated channels decreases, but the other (206) outputs Since the operation can be performed without lowering, a service area can be secured, and an effect higher than that of the related art can be expected. In the example described here, the embodiment is based on the one-cell one-sector system. However, by applying the present invention to each sector, the present invention can be applied to a one-cell multi-sector base station. In this case, the prior art and the present invention may be selectively used for each sector. As described above in detail, according to the present invention, only a signal for one carrier is input to the transmission amplifying unit, and no large amount of intermodulation distortion occurs. The number of compensating circuits can be reduced, and the cost, device size, and power consumption can be reduced. In addition, when the conventional distortion compensation circuit is used, it is possible to output higher power at the same cost and size, and to achieve higher efficiency. In addition, in the conventional configuration, a distributor / synthesizer used for operating the amplifiers in parallel as a redundant configuration is not required, and the cost and the size of the device can be reduced. Since the loss of the divider / combiner is also eliminated, it is possible to contribute to low power consumption. Regarding the redundant configuration, if one side of the transmission amplifying unit fails, the transmitting side of the corresponding frequency conversion unit cannot be used, so the number of accommodated channels is reduced. Can be secured,
It is possible to expect the effect more than the prior art.
【図面の簡単な説明】 【図1】本発明装置の構成例を示すブロック図である。 【図2】本発明装置における無線部の構成例を示すブロ
ック図である。 【図3】従来技術の構成例を示すブロック図である。 【図4】従来技術における無線部の構成例を示すブロッ
ク図である。 【符号の説明】 101 アンテナ 102 送受信増幅部 102a 送信増幅部 102b 受信増幅部 103 周波数変換部 103a,103b 周波数変換部 104 ベースバンド部 105 有線伝送路インターフェース 106 無線ネットワーク制御装置 107 無線基地局制御部 108 有線伝送路 201,202 アンテナ 203,401 デュプレクサ部 204 フィルタ部 205,206 送信増幅部 207,208 受信増幅部 209,210 周波数変換部 211,212,213,214,215 分配合成部
(合成器,分配器)
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration example of a device of the present invention. FIG. 2 is a block diagram illustrating a configuration example of a wireless unit in the device of the present invention. FIG. 3 is a block diagram showing a configuration example of a conventional technique. FIG. 4 is a block diagram illustrating a configuration example of a wireless unit in the related art. DESCRIPTION OF SYMBOLS 101 Antenna 102 Transmission / reception amplification unit 102a Transmission amplification unit 102b Reception amplification unit 103 Frequency conversion units 103a and 103b Frequency conversion unit 104 Baseband unit 105 Wired transmission path interface 106 Wireless network control unit 107 Radio base station control unit 108 Wired transmission lines 201, 202 Antenna 203, 401 Duplexer unit 204 Filter unit 205, 206 Transmission amplifying unit 207, 208 Reception amplifying unit 209, 210 Frequency conversion units 211, 212, 213, 214, 215 Distribution combining unit (combiner, distribution vessel)

Claims (1)

  1. 【特許請求の範囲】 【請求項1】 複数のRF信号を送受信するCDMA無
    線基地局装置であって、 RF信号の送受信を行うアンテナ部と、送信RF信号及
    び受信RF信号を増幅する送受信増幅部と、ベースバン
    ド信号を前記送信RF信号に変換し前記増幅された受信
    RF信号をベースバンド信号に変換する周波数変換部
    と、ベースバンド信号処理を行うベースバンド部と、移
    動通信制御局との制御信号の送受信を行い無線回線管理
    などを行う無線基地局制御部と、前記ベースバンド部と
    有線伝送路とのデータの変換を行う有線伝送路インター
    フェイス部とを備え、 前記アンテナ部と前記送受信増幅部と前記周波数変換部
    とは、前記複数のRF信号を送受信するためにおのおの
    複数個が配置され、 前記複数個の送受信増幅部の各送信部増幅部は、前記複
    数個の周波数変換部の各周波数変換部毎に個別に配置接
    続されて前記複数のRF信号のうちの対応する一つのR
    F信号のみを増幅させる構成とされ、 前記送受信増幅部の各受信部増幅部の増幅出力は、前記
    複数個の前記周波数変換部に分配供給される構成とされ
    たことを特徴とするCDMA無線基地局装置。
    Claims 1. A CDMA radio base station apparatus for transmitting and receiving a plurality of RF signals, comprising: an antenna unit for transmitting and receiving RF signals; and a transmitting and receiving amplifying unit for amplifying a transmitted RF signal and a received RF signal. A frequency conversion unit for converting a baseband signal into the transmission RF signal and converting the amplified reception RF signal into a baseband signal, a baseband unit for performing baseband signal processing, and control of a mobile communication control station. A wireless base station control unit that performs signal transmission and reception and performs wireless line management, and a wired transmission line interface unit that converts data between the baseband unit and the wired transmission line; the antenna unit and the transmission / reception amplification unit And a plurality of the frequency converters, each of which is arranged to transmit and receive the plurality of RF signals, wherein each of the plurality of transmission / reception amplifiers has The corresponding one of R of said plurality of said plurality of RF signals is disposed connected individually for each frequency conversion unit of the frequency converter
    A CDMA radio base station, wherein only the F signal is amplified, and the amplified output of each receiving amplifier of the transmission / reception amplifier is distributed and supplied to the plurality of frequency converters. Station equipment.
JP2001309817A 2001-10-05 2001-10-05 Cdma radio base station equipment Pending JP2003115793A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001309817A JP2003115793A (en) 2001-10-05 2001-10-05 Cdma radio base station equipment

Publications (2)

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JP2003115793A true JP2003115793A (en) 2003-04-18
JP2003115793A5 JP2003115793A5 (en) 2005-06-23

Family

ID=19128898

Family Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009014146A1 (en) 2007-07-24 2009-01-29 Ntt Docomo, Inc. Wireless base station apparatus
US8213992B2 (en) 2007-07-24 2012-07-03 Ntt Docomo, Inc. Radio base station apparatus
WO2014087956A1 (en) 2012-12-07 2014-06-12 日本電気株式会社 Transmission device and radio signal transmission method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009014146A1 (en) 2007-07-24 2009-01-29 Ntt Docomo, Inc. Wireless base station apparatus
EP2178218A1 (en) * 2007-07-24 2010-04-21 NTT DoCoMo, Inc. Wireless base station apparatus
US8213992B2 (en) 2007-07-24 2012-07-03 Ntt Docomo, Inc. Radio base station apparatus
EP2178218A4 (en) * 2007-07-24 2012-12-12 Ntt Docomo Inc Wireless base station apparatus
US8428651B2 (en) 2007-07-24 2013-04-23 Ntt Docomo, Inc. Radio base station apparatus
WO2014087956A1 (en) 2012-12-07 2014-06-12 日本電気株式会社 Transmission device and radio signal transmission method
US9787389B2 (en) 2012-12-07 2017-10-10 Nec Corporation Transmission device and radio signal transmission method

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