JP2004328344A

JP2004328344A - Radio base station system, radio base station device and radio transmission/reception part for use in the same, and its remote antenna signal transmission control method

Info

Publication number: JP2004328344A
Application number: JP2003119737A
Authority: JP
Inventors: Hiroaki Oba; 弘明大庭
Original assignee: NEC Saitama Ltd
Current assignee: NEC Saitama Ltd
Priority date: 2003-04-24
Filing date: 2003-04-24
Publication date: 2004-11-18
Anticipated expiration: 2023-04-24
Also published as: JP3766397B2

Abstract

<P>PROBLEM TO BE SOLVED: To allow a service form to be flexibly changed by realizing a change of a cell configuration corresponding to an antenna which accords with the service form without changing hardware. <P>SOLUTION: A radio base station device and individual radio transmission and reception parts having remote antennas 22 are cascaded by optical fibers, and frame data (a transmission multiplex signal and a reception multiplex signal) obtained by time division multiplexing of a control signal for designating a radio transmission and reception part and a plurality of baseband signals corresponding to radio transmission/reception signal carriers to/from mobile terminal devices is transmitted and received. The radio base station device designates a carrier to be used by a corresponding radio transmission and reception part by using the control signal. Each radio transmission and reception part sends the transmission multiplex signal inputted from the preceding stage to the following stage, extracts carrier data addressed to itself and transmits it from the antenna as a radio signal. The radio transmission and reception part inserts the radio signal received by the antenna to the reception multiplex signal inputted from the following stage as carrier data from itself and sends it to the preceding stage. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、遠隔地に設けられたアンテナによる移動端末装置との間の無線信号の送受信を制御する無線基地局装置と、デジタル信号を伝送する光伝送路（光ファイバ）により無線基地局装置から順次縦列に接続され、アンテナを通して送受信する無線信号の無線基地局装置との通信を行う無線送受信部と、それらを備える無線基地局システムと、その遠隔アンテナ信号伝送制御方法とに関する。
【０００２】
【従来の技術】
従来、複数の無線アンテナが遠方にある無線基地局システムにおいては、無線基地局装置と無線アンテナ間を同軸ケーブルで接続し、アナログ無線信号を送受信していた。この方式の場合、信号ロスが大きく長距離伝送に向かなかった（例えば、特許文献１参照）。
【０００３】
そこで、無線基地局装置と無線アンテナ間を光伝送路（光ファイバ）で接続し、アナログ無線信号を光信号に変換し、伝送する方式も用いられてきた。この方式の場合でも、複数の無線アンテナと接続するためにはアナログ分配器が必要なため、分配ロスが大きく長距離伝送に向かなかった。また、アナログ無線信号のため、光信号のダイナミックレンジに制約があるため、ダイナミックレンジの確保が困難であった。このため、無線信号をデジタル化して光ファイバで伝送するシステムが提案されている（例えば、特許文献２参照）。
【０００４】
【特許文献１】
特開平６−９８０４６号公報（第１−２頁、図１，５，７）
【特許文献２】
特表平８−５１０８７８号公報（第３６，８２，８７頁、図２，４２，４７）
【０００５】
【発明が解決しようとする課題】
上述した従来の、１つの無線基地局から複数の遠隔アンテナに対し信号の送受信を行うシステム（特許文献１及び２記載技術）では、すべてのアンテナが同一のチャネル（キャリア、無線周波数）に対応してセルを構成しており、アンテナ間で異なるキャリアを使用することにより、サービス形態に応じたセル構成の変更を臨機応変に行うことができなかった。
【０００６】
本発明の目的は、１つの無線基地局装置に対し複数の無線アンテナが遠方にある無線基地局システムにおいて、無線基地局装置及び各アンテナ間の信号伝送を光伝送路（光ファイバ）によるデジタル伝送を行う利点を確保しながら、サービス形態に応じたアンテナ対応のセル構成の変更をハード変更なしで実現し、サービス形態を臨機応変に変更可能とした無線基地局システム、及びそれに用いる無線基地局装置と無線送受信部と、その遠隔アンテナの信号伝送制御方法を提供することにある。
【０００７】
【課題を解決するための手段】
本発明の請求項１に係る無線基地局システムは、遠隔地に設けられたアンテナによる移動端末装置との間の無線信号の送受信を制御する無線基地局装置と、各々が前記アンテナを有し、デジタル信号を伝送する光伝送路により前記無線基地局装置から順次縦列に接続され、前記アンテナを通して送受信する無線信号の前記無線基地局装置との通信を行う複数の無線送受信部とを備える無線基地局システムにおいて、前記光伝送路で送受信する信号として、フレームの同期をとるための同期コードと、複数のキャリア各々の無線信号の振幅データを示す複数のベースバンド信号と、前記各無線送受信部に対する制御情報を示す制御信号とをフレーム単位で時分割多重した送信多重信号及び受信多重信号とし、前記基地局装置が、前記各無線送受信部に割り当てられた無線送受信部識別番号及び前記各キャリアに割り当てられたキャリア識別番号を使用して前記各無線送受信部に対する動作指示及びキャリア割当て指示を示す前記制御信号と、前記各キャリアの送信信号に対応するベースバンド信号とを前記光伝送路への送信多重信号に挿入するとともに、前記各キャリアの受信信号に対応するベースバンド信号を前記光伝送路からの受信多重信号から抽出する手段を有し、前記各無線送受信部が、自無線送受信部にあらかじめ割り当てられた前記無線送受信部識別番号に基づいて前記光伝送路からの送信多重信号から自装置宛の前記制御信号を抽出し自装置に割り当てられたキャリア識別番号を認識し、該当キャリア識別番号に基づいて、前記光伝送路からの送信多重信号から対応するキャリアの送信信号であるベースバンド信号を抽出するとともに、対応するキャリアの受信信号であるベースバンド信号を前記光伝送路への受信多重信号に挿入する手段を有する。
【０００８】
本発明の請求項２に係る無線基地局装置は、請求項１に係る無線基地局システムに用いられる無線基地局装置において、上位制御装置とのインタフェースを司る上位インタフェース部と、自無線基地局装置全体の制御を行う制御部と、移動端末装置との送受信信号を処理するベースバンド信号処理部とを備え、前記ベースバンド信号処理部が、移動端末装置への送信データから送信ベースバンド信号を生成する送信ベースバンド信号処理手段と、前記無線送受信部からの受信制御信号を入力とし、各無線送受信部の各種設定応答や状態監視応答を処理し、対応する送信制御信号を生成する制御手段と、前記送信ベースバンド信号処理手段から出力された送信ベースバンド信号と前記制御手段から出力された送信制御信号とを入力とし、多重する合成手段と、合成された送信多重信号を入力とし、パラレルデータをシリアルデータに変換するシリアライザ手段と、シリアルデータに変換された送信多重信号を入力とし、電気信号を光信号に変換し前記光伝送路へ出力する電気／光変換手段と、前記光伝送路から受信した受信多重信号を入力とし、光信号を電気信号に変換する光／電気変換手段と、電気信号に変換された受信多重信号を入力とし、シリアルデータをパラレルデータに変換するデシリアライザ手段と、パラレルデータに変換された受信多重信号を入力とし、リタイミングを行うリタイミング手段と、リタイミングされた受信多重信号を入力とし、受信ベースバンド信号と受信制御信号を分離し、前記受信制御信号を前記制御手段へ出力する分離手段と、前記分離手段で分離された受信ベースバンド信号を入力とし、移動端末装置からの受信データを復元する受信ベースバンド処理手段とを有する。
【０００９】
本発明の請求項３に係る無線基地局装置は、請求項２に係る無線基地局装置において、前記受信ベースバンド信号処理手段は、誤り訂正復号、フレーム化、データ復調、逆拡散処理を行い、複数の無線送受信部の振幅データが合成されて入力された場合は、最小桁ビット位置から合成された振幅分のビットを削除する構成を有する。
【００１０】
本発明の請求項４に係る無線送受信部は、請求項１に係る無線基地局システムに用いられる無線基地局装置において、第１の光伝送路を通して前記無線基地局装置あるいは前段の無線送受信部から入力された送信多重信号を自無線送受信部内部へ入力させるか否かを選択するための第１の光スイッチ手段と、前記第１の光スイッチ手段から出力された送信多重信号を入力とし、光信号を電気信号に変換する第１の光／電気変換手段と、電気信号に変換された送信多重信号を入力とし、シリアルデータをパラレルデータに変換する第１のデシリアライザ手段と、パラレルデータに変換された送信多重信号を入力とし、リタイミングを行う第１のリタイミング手段と、リタイミングされた送信多重信号を入力とし、送信ベースバンド信号と受信制御信号を分離する第１の分離手段と、分離された送信多重信号の一方を入力とし、パラレルデータをシリアルデータに変換する第１のシリアライザ手段と、シリアルデータに変換された送信多重信号を入力とし、電気信号を光信号に変換し出力する第１の電気／光変換手段と、前記第１の電気／光変換手段から出力された送信多重信号及び前記第１の光伝送路から入力された送信多重信号のいずれか一方を第２の光伝送路を通して後段の無線送受信部へ選択出力させるための第２の光スイッチ手段と、前記第１の分離手段で分離された送信多重信号の他方を入力とし、送信制御信号及び送信ベースバンド信号に分離する第２の分離手段と、分離された送信制御信号を入力とし各種設定や状態要求を行うとともに、各種設定応答や状態報告応答の受信制御信号を生成する制御手段と、前記第２の分離手段で分離された送信ベースバンド信号を入力とし、送信無線信号を生成する送信無線処理手段と、前記送信無線処理手段から出力された送信無線信号を入力とし外部へ電波信号として出力するとともに、外部から電波信号として入力された受信無線信号を出力するアンテナ部と、前記アンテナ部から出力された受信無線信号を入力とし、受信ベースバンド信号を生成する受信無線処理手段と、前記受信無線処理手段から出力された受信ベースバンド信号と前記制御手段から出力された受信制御信号とを入力とし、受信多重信号として多重する第１の合成手段と、前記第２の光伝送路を通して後段の無線送受信部から入力された受信多重信号を自無線送受信部内部へ入力させるか否かを選択するための第３の光スイッチ手段と、前記第３の光スイッチ手段から出力された受信多重信号を入力とし、光信号を電気信号に変換する第２の光／電気変換手段と、電気信号に変換された受信多重信号を入力とし、シリアルデータをパラレルデータに変換する第２のデシリアライザ手段と、パラレルデータに変換された受信多重信号を入力とし、リタイミングを行う第２のリタイミング手段と、前記第１の合成手段から出力された受信多重信号と前記第２のリタイミング手段から出力された受信多重信号とを入力とし、多重する第２の合成手段と、多重された受信多重信号を入力とし、パラレルデータをシリアルデータに変換する第２のシリアライザ手段と、シリアルデータに変換された受信多重信号を入力とし、電気信号を光信号に変換し出力する第２の電気／光変換手段と、前記第２の電気／光変換手段から出力された受信多重信号及び前記第２の光伝送路から入力された受信多重信号のいずれか一方を前記第１の光伝送路を通して前記無線基地局装置あるいは前段の無線送受信部へ選択出力させるための第４の光スイッチ手段とを有する。
【００１１】
本発明の請求項５に係る無線送受信部は、請求項４に係る無線送受信部において、前記第１から第４の光スイッチ手段のみで光スイッチ部を構成し、通常時と故障時とで前記光スイッチ部の各光スイッチ手段を切り替え、故障時に、前記光スイッチ部以外は故障した無線送受信部を経由させないで、無線基地局装置及び他の無線送受信部に接続させる構成を有する。
【００１２】
本発明の請求項６に係る無線送受信部は、請求項４に係る無線送受信部において、前記第１のデシリアライザ手段が入力シリアルデータから抽出したクロックを基準クロックとすることにより、前記無線基地局装置と周波数同期させる構成を有する。
【００１３】
本発明の請求項７に係る無線送受信部は、請求項４に係る無線送受信部において、前記第１の分離手段は、前記第１のシリアライザ手段及び前記第２の分離手段双方に、同じデータを出力させることにより、他の無線送受信部も同じデータを抽出できるようにする構成を有する。
【００１４】
本発明の請求項８に係る無線送受信部は、請求項４に係る無線送受信部において、前記第２の合成手段は、自無線送受信部と他の無線送受信部各々の同期コードのタイミング位置を一致させ、受信制御信号及び受信ベースバンド信号の位置を認識し多重する構成を有する。
【００１５】
本発明の請求項９に係る無線送受信部は、請求項４に係る無線送受信部において、前記第２の合成手段は、同じキャリアを複数の無線送受信部で受信させるセル構成の場合、受信ベースバンド信号の振幅を加算させる構成を有する。
【００１６】
本発明の請求項１０に係る無線送受信部は、請求項９に係る無線送受信部において、前記加算の方法として、各無線送受信部の振幅がすべて同じ振幅レベルのところで加算させる構成を有する。
【００１７】
本発明の請求項１１に係る遠隔アンテナ信号伝送制御方法は、遠隔地に設けられたアンテナによる移動端末装置との間の無線信号の送受信を制御する無線基地局装置と、各々が前記アンテナを有し、デジタル信号を伝送する光伝送路により前記無線基地局装置から順次縦列に接続され、前記アンテナを通して送受信する無線信号の前記無線基地局装置との通信を行う複数の無線送受信部とを備える無線基地局システムにおける遠隔アンテナ信号伝送制御方法において、前記光伝送路で送受信する信号として、フレームの同期をとるための同期コードと、複数のキャリア各々の無線信号の振幅データを示す複数のベースバンド信号と、前記各無線送受信部に対する制御情報を示す制御信号とをフレーム単位で時分割多重した送信多重信号及び受信多重信号とし、前記基地局装置で、前記各無線送受信部に割り当てられた無線送受信部識別番号及び前記各キャリアに割り当てられたキャリア識別番号を使用して前記各無線送受信部に対する動作指示及びキャリア割当て指示を示す前記制御信号と、前記各キャリアの送信信号に対応するベースバンド信号とを前記光伝送路への送信多重信号に挿入し、前記各無線送受信部で、自無線送受信部にあらかじめ割り当てられた前記無線送受信部識別番号に基づいて前記光伝送路からの送信多重信号から自装置宛の前記制御信号を抽出し自装置に割り当てられたキャリア識別番号を認識し、該当キャリア識別番号に基づいて、前記光伝送路からの送信多重信号から対応するキャリアの送信信号であるベースバンド信号を抽出するとともに、対応するキャリアの受信信号であるベースバンド信号を前記光伝送路への受信多重信号に挿入し、前記基地局装置で、前記各キャリアの受信信号に対応するベースバンド信号を前記光伝送路からの受信多重信号から抽出する工程を有する。
【００１８】
【発明の実施の形態】
まず、本発明の概要を説明する。本発明は、複数の送受信アンテナが遠方にある無線基地局システムにおいて、無線基地局装置と各送受信アンテナ間の伝送信号をデジタル信号とし、送信側で複数の送受信アンテナのデジタル信号を多重し、受信側で複数の送受信アンテナのデジタル信号を分離することにより、無線基地局装置から１つの光伝送路（光ファイバ）の入出力端子で複数の送受信アンテナに接続でき、且つ、デジタル信号をベースバンド信号と制御信号から構成し、セル構成に応じて無線基地局装置と各送受信アンテナ間のデジタル信号の関係を割り当てることにより、サービス形態に応じたセル構成の変更をハード変更なしで実現可能としている。また、無線基地局装置と送受信アンテナ間をデジタル信号にて伝送させるため、電力ロスがなく、電力制御においても高ダイナミックレンジが可能である。
【００１９】
次に、本発明の実施の形態について図面を参照して詳細に説明する。
【００２０】
図１は本発明の無線基地局システムの一実施の形態を示すシステム構成図であり、Ｗ−ＣＤＭＡ（Ｗｉｄｅｂａｎｄ−ＣｏｄｅＤｉｖｉｓｉｏｎＭｕｌｔｉｐｌｅＡｃｃｅｓｓ：広帯域符号分割多元接続）方式の移動通信システムに適用した例を示す。図１において、本例の無線基地局システムは、図示していない上位の制御装置と接続され、その制御を受ける無線基地局装置１０１と、この無線基地局装置１０１に光伝送路により縦列接続され、それぞれ移動機（移動端末装置）と割り当てられたキャリア（無線搬送波）対応の無線周波数信号による無線送受信を行うアンテナを含む複数（図示は４台）の無線送受信部１０２〜１０５とを有している。つまり、無線基地局装置１０１は第１の無線送受信部１０２と入出力各１本の光ファイバにより接続される。第１の無線送受信部１０２は第２の無線送受信部１０３と入出力各１本の光ファイバにより接続される。第２の無線送受信部１０３は第３の無線送受信部１０４と入出力各１本の光ファイバにより接続される。第３の無線送受信部１０４は第４の無線送受信部１０５と入出力各１本の光ファイバにより接続される。
【００２１】
無線基地局装置１０１は、詳細な図示は省略するが、上位の制御装置（例えば、無線ネットワーク制御装置）とのインタフェースを司り移動機に対するユーザ信号及び制御信号の送受信を行う上位インタフェース手段と、上位インタフェース手段と接続され、移動機に対するユーザ信号（ベースバンド信号）の誤り訂正符号／復号、フレーム化、データ変調／復調、拡散／逆拡散を行うベースバンド信号処理手段と、ベースバンド信号処理手段と無線送受信部１０２〜１０５とのインタフェースを司りベースバンド信号の送受信を行う装置間インタフェース手段と、これら上位インタフェース手段、ベースバンド信号処理手段、及び装置間インタフェース手段を制御する制御手段とを備えている。
【００２２】
各無線送受信部１０２〜１０５は、無線基地局装置１０１や隣接する他の無線送受信部とのインタフェースを司り、ベースバンド信号の送受信を行う装置間インタフェース手段と、ベースバンド信号／無線周波数信号の相互変換を行いアンテナ対応に形成されるセル内に位置する移動機との無線インタフェースを司る無線処理手段と、これら装置間インタフェース手段、及び無線処理手段を制御する制御手段とを備えている。
【００２３】
無線基地局システム（無線基地局装置１０１）の上位の制御装置は、さらにその上位装置であるコアネットワークの交換機と接続され、他の制御装置、配下の複数の無線基地局システム、及び複数の移動機とともに移動通信システムを構成する。コアネットワークには、ユーザ端末を収容した他のネットワークも接続可能であり、ユーザ端末及び移動機間、あるいは移動機相互間の通信を可能としている。
【００２４】
図２は、無線基地局装置１０１の詳細なブロック構成例を示す図であり、本発明に関係する部分のみを示している。
【００２５】
図２において本例の無線基地局装置１０１は、送信ベースバンド信号を生成し出力する送信ベースバンド信号処理部１と、送信制御信号を生成し出力し、且つ、受信制御信号を入力し、制御信号を処理する制御部（ＣＰＵ）２と、送信ベースバンド信号処理部１から出力された送信ベースバンド信号及びＣＰＵ２から出力された送信制御信号を入力し、これらを合成して送信多重信号として出力する合成部３と、合成部３から出力された送信多重信号を入力し、パラレルデータをシリアルデータに変換して出力するシリアライザ部４と、シリアライザ部４から出力された送信多重信号を入力し、電気信号を光信号に変換し光伝送路（ファイバ）を通して無線送受信部１０２に出力する電気／光変換部５と、光伝送路（ファイバ）を通して無線送受信部１０２から出力された受信多重信号を入力し、光信号を電気信号に変換して出力する光／電気変換部６と、光／電気変換部６から出力された受信多重信号を入力し、シリアルデータをパラレルデータに変換して出力するデシリアライザ部７と、デシリアライザ部７から出力された受信多重信号を入力し、リタイミングさせ出力するリタイミング部８と、リタイミング部８から出力された受信多重信号を入力し、ＣＰＵ２へ受信制御信号を出力し、且つ、受信ベースバンド信号を出力する分離部９と、分離部９から出力された受信ベースバンド信号を入力し、受信ベースバンド信号を処理する受信ベースバンド信号処理部１０とを有している。
【００２６】
図３は、無線送受信部１０２の詳細なブロック構成例を示す図である。なお、他の無線送受信部１０３〜１０５も同様の構成である。
【００２７】
図３において本例の無線送受信部１０２は、光伝送路（ファイバ）を通して無線基地局装置１０１から出力された送信多重信号を入力し、選択して出力する光スイッチ部１１のスイッチ（第１のスイッチ）３１と、スイッチ３１から出力された一方の送信多重信号を入力し、光信号を電気信号に変換して出力する光／電気変換部（第１の光／電気変換部）１２と、光／電気変換部１２から出力された送信多重信号を入力し、シリアルデータをパラレルデータに変換して出力するデシリアライザ部（第１のデシリアライザ部）１３と、デシリアライザ部１３から出力された送信多重信号を入力し、リタイミングさせて出力するリタイミング部（第１のリタイミング部）１４と、リタイミング部１４から出力された送信多重信号を入力し、２つに分離して出力する分離部（第１の分離部）１５と、分離部１５から出力された一方の送信多重信号を入力し、パラレルデータをシリアルデータに変換して出力するシリアライザ部（第１のシリアライザ部）１６と、シリアライザ部１６から出力された送信多重信号を入力し、電気信号を光信号に変換して出力する電気／光変換部（第１の電気／光変換部）１７と、電気／光変換部１７から出力された送信多重信号及びスイッチ３１から出力された他方の送信多重信号を入力し、次段（後段）の無線送受信部１０３に選択出力する光スイッチ部１１のスイッチ（第２のスイッチ）３２と、分離部１５から出力された他方の送信多重信号を入力し、送信制御信号と送信ベースバンド信号を分離出力する分離部（第２の分離部）１８と、分離部１８から出力された送信制御信号を入力し、制御信号を処理し、且つ、受信制御信号を生成し出力する制御部（ＣＰＵ）１９と、分離部１８から出力された送信ベースバンド信号を入力し、送信無線信号を生成して出力する送信無線処理部２０と、第１のポート（入出力端）に入力された送信無線処理部２０からの送信無線信号を第２のポートに出力しアンテナ部２２へ送るとともに、第２のポートに入力されたアンテナ部２２からの受信無線信号を第３のポートに出力し受信無線処理部２３へ送るサーキュレータ部２１と、サーキュレータ部２１から出力された送信無線信号を入力し、外部（移動機）へ電波信号として放射し、且つ、外部から入射された電波信号を受信し受信無線信号としてサーキュレータ部２１へ出力するアンテナ部２２と、アンテナ部２２から出力された受信無線信号をサーキュレータ部２１を通して入力し、受信ベースバンド信号を出力する受信無線処理部２３と、受信無線処理部２３から出力された受信ベースバンド信号及びＣＰＵ１９から出力された受信制御信号を入力し、多重して受信多重信号を出力する合成部（第１の合成部）２４と、次段の無線送受信部１０３から出力された受信多重信号を入力し、選択して出力する光スイッチ部１１のスイッチ（第３のスイッチ）３３と、スイッチ３３から出力された一方の受信多重信号を入力し、光信号を電気信号に変換して出力する光／電気変換部（第２の光／電気変換部）２６と、光／電気変換部２６から出力された受信多重信号を入力し、シリアルデータをパラレルデータに変換して出力するデシリアライザ部（第２のデシリアライザ部）２７と、デシリアライザ部２７から出力された受信多重信号を入力し、リタイミングさせて出力するリタイミング部（第２のリタイミング部）２８と、合成部２４から出力された受信多重信号及びリタイミング部２８から出力された受信多重信号を入力し、多重して出力する合成部（第２の合成部）２５と、合成部２５から出力された受信多重信号を入力し、パラレルデータをシリアルデータに変換して出力するシリアライザ部（第２のシリアライザ部）２９と、シリアライザ部２９から出力された受信多重信号を入力し、電気信号を光信号に変換して出力する電気／光変換部（第２の電気／光変換部）３０と、電気／光変換部３０から出力された受信多重信号及びスイッチ３３から出力された他方の受信多重信号を入力し、無線基地局装置１０１に選択出力する光スイッチ部１１のスイッチ（第４のスイッチ）３４とを有している。
【００２８】
上述したように、他の無線送受信部１０３、１０４、及び１０５の構成も無線送受信部１０２と同様の構成であり、光スイッチ部１１に接続される前段側及び後段側の各外部機器の名称（無線基地局装置１０１及び無線送受信部１０３）を、適宜、無線送受信部１０２及び１０４、あるいは無線送受信部１０３及び１０５や、無線送受信部１０４に読み替えればよい（ただし、最終段の無線送受信部１０５は、前段の無線送受信部１０４としか接続されない）。
【００２９】
次に本発明の実施の形態の動作についてさらに詳細に説明する。ここでは、移動通信システムで使用されているＷ−ＣＤＭＡ方式の無線基地局装置（チップレート３．８４Ｍｂｐｓ）で、且つ４つの送受信アンテナが遠方にある装置構成を例に説明する。また、無線基地局装置と各無線送受信部間及び無線送受信部と他の無線送受信部間は、長距離伝送に適した光ファイバを使用し、伝送レート１．２５Ｇｂｐｓ付近にてシリアル伝送させる場合を例に説明する。
【００３０】
まず、図２及び図３を用いて、送信信号の流れについて説明する。
【００３１】
図２に示す送信ベースバンド信号処理部１で生成された４キャリア分の送信ベースバンド信号は、合成部３にそれぞれ出力される。また、ＣＰＵ２から無線送受信部１０２〜１０５の各種設定や状態監視をおこなう送信制御信号を合成部３に出力する。
【００３２】
合成部３では、４キャリア分の送信ベースバンド信号と送信制御信号の多重を行う。多重は、図４に示すように、１単位をフレームとし、フレームの先頭に同期コード（２バイト）を付加する。同期コードは、送信ベースバンド信号の各キャリア（８バイト）と送信制御信号（６バイト）のデータ位置を検出するために使用される。また、同期コードの次の時間には送信制御信号を付加する。このとき、送信ベースバンド信号は振幅データのため、連続送信が必要であることと、送信制御信号は送信ベースバンド信号と比較し、データ量が少ないため、１フレームに１キャリア分もしくは複数フレームで１キャリア分の送信制御信号を付加することにより、できるだけ送信ベースバンド信号の帯域を確保する。
【００３３】
送信制御信号には、表１に示すように、各無線送受信部１０２〜１０５を区別するためにあらかじめ割り当てられた無線送受信部識別番号である号番ビット（ｂｉｔ）と、表２に示すように、各キャリア１〜４（その組み合わせを含む）を区別するためにあらかじめ割り当てられたキャリア識別番号である識別ビット（ｂｉｔ）を付加する。
【００３４】
【表１】

【００３５】
【表２】

【００３６】
なお、各無線送受信部１０２〜１０５には、あらかじめＤＩＰＳＷ（ｄｕａｌｉｎｌｉｎｅｐａｃｋａｇｅｓｗｉｔｃｈ）等により、自分の号番を設定しておく。
【００３７】
また、送信制御信号の次の時間にはキャリア１、キャリア２、キャリア３、キャリア４の送信ベースバンド信号をそれぞれ付加する。送信ベースバンド信号は、送信ダイバーシチ有の場合、０系／１系からなり、それぞれＩ／Ｑの振幅データ情報で構成されているため、ダイナミックレンジや電力制御精度を確保するために、通常それぞれ２バイト（ｂｙｔｅ）程度のバイト数が必要になる。すなわち１キャリアあたり８ｂｙｔｅの情報が必要である。
【００３８】
また、振幅データは連続送信させる必要があることと、光ファイバの伝送は通常、８Ｂ／１０Ｂエンコード／デコードにより、８／１０ｂｉｔに変換して、１０ｂｉｔのシリアル伝送を行うことから、光ファイバ伝送上の４キャリアに必要とされる送信ベースバンド信号の伝送レートは、『（３．８４×１０^６）Ｍｂｐｓ×８ｂｙｔｅ×４キャリア×１０ｂｉｔ＝１．２２８８Ｇｂｐｓ』となる。
【００３９】
ここで、伝送レート１．２５Ｇｂｐｓ付近の光／電気、電気／光変換部は一般的に安価であるために、１．２５Ｇｂｐｓ付近にてシリアル伝送させることを考えると、同期コード及び送信制御信号に割り当てられる帯域は、『１．２５Ｇｂｐｓ−１．２２８８Ｇｂｐｓ＝２１２Ｍｂｐｓ』となる。
【００４０】
よって、実際に送信するレートは、図４に示すように送信ベースバンド信号の４キャリア分の１振幅データ（３．８４Ｍｂｐｓ）を１グループとし、例えば同期コード２ｂｙｔｅと、送信制御信号６ｂｙｔｅと、送信ベースバンド信号を１６グループを１フレームとして伝送させると、１フレームあたりのｂｙｔｅ数が、『２（同期コード）＋６（送信制御信号）＋１６×３２（送信ベースバンド信号）＝５２０ｂｙｔｅ』となる。１．２５Ｇｂｐｓで伝送させると考えると、１秒間に『１．２５Ｇｂｐｓ／５２０ｂｙｔｅ＝２４０３８４６．１５４フレーム』送ることになるが、商は整数である方が効率よく伝送ができ、且つ１．２２８８Ｇｂｐｓと最小公倍数をもつレートを選択すると、『５２０ｂｙｔｅ×２４０００００フレーム＝１．２４８Ｇｂｐｓ』とすることにより、送信ベースバンド信号を連続送信させながら、１．２５Ｇｂｐｓ付近での伝送が可能となる。
【００４１】
次に、合成部３を出力した送信多重信号は、シリアライザ部４に入力され、シリアルデータに変換される。シリアルデータに変換された送信多重信号は、電気／光変換部５に入力され、電気信号から光信号に変換される。光信号に変換された送信多重信号は、光ファイバを経由して図３に示す無線送受信部１０２に出力される。
【００４２】
無線送受信部１０２では、無線基地局装置１０１からの送信多重信号は、光スイッチ部１１のスイッチ３１に入力される。スイッチ３１は、図５に示すように、通常時（故障検出信号がＨ（高）レベル）は、光／電気変換部１２側に接続されているため、送信多重信号は光／電気変換部１２に出力される。
【００４３】
また、無線送受信部１０２が故障時は、図６に示すように、無線基地局装置１０１を出力した送信多重信号を無線送受信部１０２の光スイッチ部１１を経由したのみで、無線送受信部１０３以降に出力できるようにスイッチ３１とスイッチ３２とを接続し、動作させ、他の無線送受信部１０３〜１０５に影響を与えないようにする。同時に、スイッチ３３とスイッチ３４とを切り替えて相互に接続し、動作させ、他の無線送受信部１０３〜１０５からの信号（受信多重信号）が光スイッチ部１１を経由したのみで、無線基地局装置１０１へ出力できるようにする。
【００４４】
無線送受信部１０２が故障した場合に各スイッチ３１〜３４を切り替えるには、光スイッチ部１１に供給する故障検出信号をＨレベルからＬ（低）レベルに切り替えることにより、各スイッチ３１〜３４の接続先を切り替える構成とすればよい。なお、この故障検出信号は、図示していない故障検出手段により生成される。
【００４５】
次に、通常時の動作説明を続ける。送信多重信号は、光／電気変換部１２に入力され、光信号から電気信号に変換される。電気信号に変換された送信多重信号は、デシリアライザ部１３に入力され、パラレルデータに変換される。また、通常のデシリアライザは送信側のシリアルデータに同期したＣＬＫ（クロック）を抽出できるため、このＣＬＫを無線送受信部１０２の基準ＣＬＫとすることにより、無線基地局装置１０１と無線送受信部１０２は周波数同期を取ることができる。
【００４６】
パラレルデータに変換された送信多重信号は、リタイミング部１４に入力される。リタイミング部１４は、無線基地局装置１０１基準ＣＬＫから無線送受信部１０２基準ＣＬＫに変換することにより、後段においてジッタを除去したＣＬＫで動作させることができ、また、無線送受信部１０２内の設計をしやすくするために挿入されている。
【００４７】
次に、送信多重信号は、分離部１５に入力される。このとき、分離部１５は、送信多重信号を一方はシリアライザ部１６に出力させ、他方は分離部１８に出力させるが、同じデータを双方に出力させることにより、他の無線送受信部１０３〜１０５でも無線送受信部１０２と同じデータを抽出できるようにしておく。
【００４８】
シリアライザ部１６に入力された一方の送信多重信号は、シリアルデータに変換され、電気／光変換部１７に入力される。電気／光変換部１７に入力された送信多重信号は、光信号に変換され、光スイッチ部１１のスイッチ３２に入力される。スイッチ３２は、図５に示すように通常時は、無線送受信部１０３に接続されているため、無線送受信部１０３に出力される。
【００４９】
また、図６に示すように無線送受信部１０２が故障時は、無線基地局装置１０１を出力した送信多重信号を直接、無線送受信部１０３以降に出力できるようにスイッチ３１とスイッチ３２を接続して動作させることにより、電気／光変換部１７を経由した送信多重信号はどこにも出力されない。
【００５０】
次に、分離部１５から出力された送信多重信号の他方は分離部１８に入力される。分離部１８は、送信制御信号と送信ベースバンド信号を分離するが、このとき無線送受信部１０２宛の信号のみ抽出する。抽出方法は、同期コードの位置から、送信制御信号及び送信ベースバンド信号の位置を認識し、送信制御信号の場合は、表１に示すような送信制御信号内に号番ｂｉｔを割り当ててあるので、自分のＤＩＰＳＷの設定と号番ｂｉｔが一致した送信制御信号を抽出可能となる。
【００５１】
また、送信ベースバンド信号の場合は、送信ベースバンド信号内に号番ｂｉｔを割り当てると帯域が広がるため、無駄な帯域を使用しないために、装置立ち上げ時に、あらかじめ号番ｂｉｔと識別ｂｉｔの関係を送信制御信号で送信するとにより、自無線送受信部宛の送信ベースバンド信号が同期コードから何バイト目を抽出すればよいか判断でき、抽出可能となる。
【００５２】
表３は、各無線送受信部１０２〜１０５のキャリア割り当てを、それぞれキャリア１（識別ビット０００）、キャリア２（識別ビット００１）、キャリア３（識別ビット０１１）、キャリア４（識別ビット１００）に割り当てた場合の例である。また、図７は、そのときのセル構成である。このときは１つの無線送受信部につき最大１キャリアの送信が可能である。
【００５３】
【表３】

【００５４】
また、表４に示すように無線送受信部１０２〜１０５のすべてをキャリア１（識別ビット０００）に割り当てることも可能である。図８は、そのときのセル構成である。このとき、１つの無線送受信部につき最大１キャリアの送信が可能である。なお、各無線送受信部１０２〜１０５にすべてのキャリア１〜４（識別ビット１１１）を割り当てることも可能である。このときは、１つの無線送受信部につき最大４キャリアの送信が可能となる。
【００５５】
【表４】

【００５６】
このように制御させることにより、ＣＰＵ１９では自無線送受信部宛の送信制御信号のみを処理し、また、送信無線処理部２０以降は、自無線送受信部宛の送信ベースバンド信号のみ処理することができる。
【００５７】
次に、送信無線処理部２０に入力された送信ベースバンド信号は、デジタル／アナログ変換され、周波数変換され、送信無線信号としてサーキュレータ部２１に出力される。サーキュレータ部２１に入力された送信無線信号は、アンテナ部２２に出力される。この送信無線信号は、受信無線処理部２３には出力しないようにしておく。
【００５８】
アンテナ部２２に入力された送信無線信号は、対応するキャリアの電波信号として外部へ出力され、移動機（端末装置）へ送信される。
【００５９】
なお、後段の無線送受信部１０３及び１０４の動作も、それぞれ前段の無線送受信部１０２及び１０３から出力された送信多重信号を入力として、無線送受信部１０２と同様の動作をする。また、最終段の無線送受信部１０５の動作は、無線送受信部１０４から出力された送信多重信号を入力として、送信多重信号をどこにも出力しない以外は、無線送受信部１０２と同様の動作をする。
【００６０】
次に、図２及び図３を用いて、受信信号の流れについて説明する。
【００６１】
外部の移動機（端末装置）から送信された対応するキャリアの電波信号（受信無線信号）は、図３に示すアンテナ部２２に入力される。アンテナ部２２に入力された受信無線信号は、サーキュレータ部２１に出力される。サーキュレータ部２１に入力された受信無線信号は、受信無線処理部２３に出力される。この受信無線信号は、送信無線処理部２０には出力しないようにしておく。
【００６２】
受信無線処理部２３に入力された受信無線信号は、周波数変換され、アナログ／デジタル変換され、受信ベースバンド信号として、合成部２４に出力される。
【００６３】
また、ＣＰＵ１９から無線基地局装置１０１への各種の設定応答や状態監視応答を行う受信制御信号を合成部２４に出力する。
【００６４】
合成部２４では、受信制御信号と、受信ベースバンド信号の多重を行う。多重方法は送信信号と同様に、図４に示すように、１単位をフレームとし、フレームの先頭に同期コードを付加する。同期コードは、受信ベースバンド信号の各キャリアと、受信制御信号のデータ位置を検出するために使用される。また、同期コードの次の時間には受信制御信号を付加する。このとき、受信ベースバンド信号は振幅データのために、連続送信が必要であることと、受信制御信号は受信ベースバンド信号と比較し、データ量が少ないため、１フレームに１キャリア分もしくは複数フレームで１キャリア分の受信制御信号を付加することにより、できるだけ受信ベースバンド信号の帯域を確保する。また、受信制御信号には、表１に示すように無線送受信部１０２〜１０５を区別する号番ｂｉｔと、表２に示すように各キャリアを区別する識別ｂｉｔを付加する。
【００６５】
また、受信制御信号の次の時間にはキャリア１、キャリア２、キャリア３、キャリア４の受信ベースバンド信号が割り当てられている。受信ベースバンド信号は、通常受信ダイバーシチ有であり、０系／１系からなり、それぞれＩ／Ｑの振幅データ情報で構成されているため、受信側は送信側と異なりダイナミックレンジはさほど必要とされず、通常それぞれ１バイト程度のバイト数が必要になる。
【００６６】
しかし、表３に示すように各無線送受信部１０２〜１０５がすべて異なるキャリアであればよいが、表４に示すように各無線送受信部１０２〜１０５がすべて同じキャリアの場合は、振幅を加算させる必要がある。よって、２バイトを割り当てる。すなわち送信側と同様に１キャリアあたり１６バイトの情報が必要である。
【００６７】
また、振幅データは連続送信させる必要があることと、光ファイバでの伝送は通常８Ｂ／１０Ｂエンコード／デコードにより、８／１０ｂｉｔに変換して、１０ｂｉｔのシリアル伝送を行うことから、光ファイバ伝送上の４キャリアに必要とされる受信ベースバンド信号の伝送レートは、『（３．８４×１０^６）Ｍｂｐｓ×８ｂｙｔｅ×４キャリア×１０ｂｉｔ＝１．２２８８Ｇｂｐｓ』となる。
【００６８】
ここで、伝送レート１．２５Ｇｂｐｓ付近にてシリアル伝送させることを考えると、同期コード及び受信制御信号に割り当てられる帯域は、『２．２５Ｇｂｐｓ−１．２２８８Ｇｂｐｓ＝２１２Ｍｂｐｓ』となる。よって、図４に示すように受信ベースバンド信号の４キャリア分の１振幅データ（３．８４Ｍｂｐｓ）を１グループとすると、例えば同期コード２バイトと、受信制御信号６バイトと、受信ベースバンド信号を１６グループを１フレームとして伝送させると、送信ベースバンド信号と同様に、受信ベースバンド信号を連続送信させながら、１．２５Ｇｂｐｓ付近での伝送が可能となる。
【００６９】
次に、合成部２４を出力した受信多重信号は、合成部２５に入力される。また、次段の無線送受信部１０３から出力された受信多重信号は、光スイッチ部１１のスイッチ３３に入力される。スイッチ３３は、図５に示すように通常時は光／電気変換部２６に接続されているため、光／電気変換部２６に出力される。
【００７０】
また、図６示すように無線送受信部１０２が故障時は、無線送受信部１０３を出力した受信多重信号を無線送受信部１０２の光スイッチ部１１を経由したのみで、無線基地局装置１０１に出力できるようにスイッチ３３とスイッチ３４とを接続し、動作させ、他の無線送受信部１０３〜１０５に影響を与えないようにする。
【００７１】
次に、通常時、受信多重信号は、光／電気変換部２６に入力され、光信号から電気信号に変換される。電気信号に変換された受信多重信号は、デシリアライザ部２７に入力され、パラレルデータに変換される。パラレルデータに変換された受信多重信号は、リタイミング部２８に出力される。
【００７２】
リタイミング部２８は、無線送受信部１０３の基準のＣＬＫ（クロック）から無線送受信部１０２基準のＣＬＫに変換することにより、無線送受信部１０２内の設計をしやすくするために挿入されている。
【００７３】
合成部２５では、無線送受信部１０２内で多重された受信多重信号と、後段の無線受信部１０３〜１０５で多重された受信多重信号の多重を行う。多重方法は、無線受信部１０３及び１０４及び１０５で多重された受信多重信号の同期コードの位置（フレームタイミング）をずらし、無線送受信部１０２内で多重された受信多重信号と一致させる。その後、受信制御信号は他の無線送受信部１０３〜１０５の受信制御信号と輻輳しないようにＣＰＵ１９で制御しながら、制御信号の時間に受信制御信号を挿入する。
【００７４】
また、受信ベースバンド信号は、表３に示すように各無線送受信部１０２〜１０５がすべて異なるキャリアの場合は、同期コードの位置から各キャリア毎に割り当てられた時間に受信ベースバンド信号を挿入する。図７は、そのときのセル構成である。このときは１つの無線送受信部につき最大１キャリアの受信が可能である。
【００７５】
また、表４に示すように各無線送受信部１０２〜１０５がすべて同じキャリアの場合は、振幅を加算させる。加算の方法は、各無線送受信部の振幅がすべて同じ振幅レベルのところで加算させる。すなわち、仮に各無線送受信部の振幅が８ｂｉｔとし、無線送受信部１０２へ入力される無線送受信部１０３及び１０４及び１０５の合成振幅が１０ｂｉｔの場合は、ＬＳＢ（一番小さい振幅ｂｉｔ桁）の位置を合わせて加算させればよい。
【００７６】
その後、各キャリア毎に割り当てられた時間に受信ベースバンド信号を挿入する。また、図８は、そのときのセル構成である。このとき、１つの無線送受信部につき最大１キャリアの受信が可能である。なお、各無線送受信部１０２〜１０５にすべてのキャリア１〜４（識別ビット１１１）を割り当てたときは、１つの無線送受信部につき最大４キャリアの受信が可能となる。
【００７７】
次に、合成部２５を出力した受信多重信号は、シリアライザ部２９に入力される。シリアライザ部２９に入力された受信多重信号は、シリアルデータに変換され、電気／光変換部３０に入力される。電気／光変換部３０に入力された受信多重信号は、光信号に変換され、光スイッチ部１１のスイッチ３４に入力される。
【００７８】
スイッチ３４は、図５に示すように通常時は、無線基地局装置１０１に接続されているため、無線基地局装置１０１に出力される。また、図６に示すように無線送受信部１０２が故障時は、無線送受信部１０３から出力された受信多重信号を直接、無線基地局装置１０１に出力できるようスイッチ３３とスイッチ３４を接続して動作させることにより、電気／光変換部３０を出力した受信多重信号はどこにも出力されない。
【００７９】
無線送受信部１０２を出力した受信多重信号は、図２に示す無線基地局装置１０１の光／電気変換部６に入力される。受信多重信号は、光／電気変換部６に入力され、光信号から電気信号に変換される。電気信号に変換された受信多重信号は、デシリアライザ部７に入力され、パラレルデータに変換される。パラレルデータに変換された受信多重信号は、リタイミング部８に出力される。
【００８０】
リタイミング部８は、無線送受信部１０２の基準のＣＬＫ（クロック）から無線基地局装置１０１の基準のＣＬＫに変換することにより、無線基地局装置１０１内の設計をしやすくするために挿入されている。次に、受信多重信号は、分離部９に出力される。
【００８１】
分離部９は、受信制御信号と受信ベースバンド信号を分離するが、同期コードの位置から、受信制御信号と受信ベースバンド信号の位置を認識し、受信制御信号の場合は、表１に示すように送信側で、受信制御信号内に号番ｂｉｔを挿入しているため、どの受信制御信号がどの無線送受信部のものか判断できる。送信ベースバンド信号の場合は、図４に示すようにあらかじめ伝送フォーマットを決めておくことにより、どのキャリアの受信ベースバンド信号か判断できる。よって、分離部９は、受信制御信号をＣＰＵ２に出力し、受信ベースバンド信号をそれぞれ受信ベースバンド信号処理部１０に出力できる。
【００８２】
受信ベースバンド信号処理部１０は、誤り訂正復号、フレーム化、データ復調、逆拡散処理を行うが、図８のように無線送受信部１０２〜１０５がすべて同じキャリアの場合は、加算した振幅ｂｉｔをｂｉｔ制限する。例えば、無線送受信部１０２及び１０３及び１０４及び１０５の合成振幅が１１ｂｉｔの場合は、合成前の振幅が８ｂｉｔであれば、ＬＳＢ（一番小さい振幅ｂｉｔ）から３ｂｉｔを削除し、８ｂｉｔとすれば、表４のようなセル構成と同じように扱うことが可能となる。尚、ｂｉｔ削除しても４つの無線送受信部を１つのセルとして考えるのなら、合成振幅は８ｂｉｔあればよい。
【００８３】
また、無線送受信部１０３及び１０４の動作も、それぞれ無線送受信部１０４、１０５から出力された受信多重信号を入力として、無線送受信部１０２と同様の動作をする。また、最終段の無線送受信部１０５の動作は、入力する受信多重信号がないだけで、無線送受信部１０２と同様の動作をする。
【００８４】
なお、光ファイバに関して、通常、シングルモードとマルチモードがあるが、シングルモードの方が高伝送レートや長距離伝送に適している。また、シングルモードで送受信用の信号が１本ずつ組み込まれた光ファイバを使用することにより、性能及び価格の面から有利となる。
【００８５】
次に、本発明の他の実施の形態について図面を参照して詳細に説明する。
【００８６】
この実施の形態例として、図９に示すように、無線送受信部１０２及び１０３でキャリア１及び２を送信し、無線送受信部１０４及び１０５からキャリア３及び４を送受信してもよい。その場合、表５に示すように、号番ｂｉｔと識別ｂｉｔを割り当てる。
【００８７】
【表５】

【００８８】
上述した実施の形態例と同様に送信側では、無線基地局装置１０１から送信された送信多重信号を無線送受信部１０２は入力とし、同期コードの位置から、送信制御信号及び送信ベースバンド信号の位置を認識し、送信制御信号の場合は、自無線送受信部宛の号番ｂｉｔ（００）のみの送信制御信号を抽出し、キャリア１及び２の送信ベースバンド信号を抽出する。
【００８９】
また、無線送受信部１０３は、同期コードの位置から、送信制御信号及び送信ベースバンド信号の位置を認識し、送信制御信号の場合は、自無線送受信部宛の号番ｂｉｔ（０１）のみの制御信号を抽出し、キャリア１及び２の送信ベースバンド信号を抽出する。
【００９０】
また、無線送受信部１０４は、同期コードの位置から、送信制御信号及び送信ベースバンド信号の位置を認識し、送信制御信号の場合は、自無線送受信部宛の号番ｂｉｔ（１０）のみの制御信号を抽出し、キャリア３及び４の送信ベースバンド信号を抽出する。
【００９１】
また、無線送受信部１０５は、同期コードの位置から、送信制御信号及び送信ベースバンド信号の位置を認識し、送信制御信号の場合は、自無線送受信部宛の号番ｂｉｔ（１１）のみの制御信号を抽出し、キャリア３及び４の送信ベースバンド信号を抽出する。
【００９２】
また、上述した実施の形態例と同様に受信側では、無線送受信部１０５は、フレームの先頭に同期コードを付加し、自分の号番ｂｉｔ（１１）を付加し受信制御信号の時間に送信する。また、受信ベースバンド信号は、キャリア３及び４の振幅データをキャリア３及び４に割り当てられた時間に付加し送信する。
【００９３】
また、無線送受信部１０４は、無線受信部１０５で多重された受信多重信号の同期コードの位置（フレームタイミング）をずらし、無線送受信部１０４内で多重された受信多重信号と一致させる。その後、受信制御信号は無線送受信部１０５の受信制御信号と輻輳しないようにＣＰＵ１９で制御しながら制御信号の時間に自分の号番ｂｉｔ（１０）を付加し、受信制御信号の時間に送信する。また、受信ベースバンド信号は、無線送受信部１０５と同様のキャリア３及び４が割り当てられているので、各キャリアの振幅データを加算させた後にキャリア３及び４に割り当てられた時間に付加し送信する。
【００９４】
また、無線送受信部１０３は、無線受信部１０４で多重された受信多重信号の同期コードの位置（フレームタイミング）をずらし、無線送受信部１０３内で多重された受信多重信号と一致させる。その後、受信制御信号は無線送受信部１０４及び１０５の受信制御信号と輻輳しないようにＣＰＵ１９で制御しながら制御信号の時間に自分の号番ｂｉｔ（０１）を付加し、受信制御信号の時間に送信する。また、受信ベースバンド信号は、キャリア１及び２の振幅データをキャリア１及び２に割り当てられた時間に付加し送信する。
【００９５】
また、無線送受信部１０２は、無線受信部１０３で多重された受信多重信号の同期コードの位置（フレームタイミング）をずらし、無線送受信部１０２内で多重された受信多重信号と一致させる。その後、受信制御信号は無線送受信部１０３及び１０４及び１０５の受信制御信号と輻輳しないようにＣＰＵ１９で制御しながら制御信号の時間に自分の号番ｂｉｔ（００）を付加し、受信制御信号の時間に送信する。また、受信ベースバンド信号は、無線送受信部１０３と同様のキャリア１及び２が割り当てられているので、各キャリアの振幅データを加算させた後にキャリア１及び２に割り当てられた時間に付加し送信する。
【００９６】
また、無線基地局装置１０１の分離部９は、同期コードの位置から、受信制御信号と受信ベースバンド信号の位置を認識し、受信制御信号は、号番ｂｉｔにより、各無線送受信部１０２〜１０５を区別する。また、受信ベースバンド信号は、キャリア毎に分離し、受信ベースバンド信号処理部１０に送信する。
【００９７】
次に、受信ベースバンド信号処理部１０では、加算した振幅ｂｉｔをｂｉｔ制限する。各キャリア１及び２及び３及び４は、それぞれ２つの無線送受信部の振幅の合成である。例えば、合成振幅が９ｂｉｔの場合は、合成前の振幅が８ｂｉｔであれば、ＬＳＢ（一番小さい振幅ｂｉｔ）のみ削除し、８ｂｉｔとすればよい。
【００９８】
なお、図２において、４キャリア分の送信ベースバンド信号の多重は、送信ベースバンド信号処理部１で多重してもよい。同様に、４キャリア分の受信ベースバンド信号の分離は、受信ベースバンド信号処理部１０で分離してもよい。
【００９９】
また、送信ダイバーシチ無しの場合は、８キャリア分の送信出力が可能である。
【０１００】
また、図４の伝送フォーマットは送受信で異なるフォーマットでもよい。
【０１０１】
また、伝送路を１．２４８Ｇｂｐｓ以上とすれば、さらに複数の無線送受信部との接続することが可能であり、さらに複数のキャリアも送受信可能となる
以上説明したように本発明の実施の形態によれば、以下に記載するような効果を奏する。まず、一つの無線基地局装置から、複数の無線送受信部間を入出力各１本の光ファイバで縦列に接続し、無線基地局装置と各無線送受信部間をベースバンド信号と制御信号を時分割で多重し、同期コードの位置により分離可能としたデジタル信号で伝送させているので、無線基地局装置と各無線送受信部をそれぞれ個別に接続する必要がなく、かつ伝送レートを有効に使用できるので、配線数を少なく、かつ配線距離を短くでき、設置工事が簡易にできるようになる。これにより、信号ロスやダイナミックレンジの制約のないシステムを低コストで供給できる。さらに、サービス形態に応じたセル構成の変更がハード変更なしで実現可能なため、基地局設置先のサービス形態にフレキシビリティに対応でき、また、音声呼量の多い時間帯には各無線送受信部で異なるキャリアで送信し、データ通信など移動端末装置に向けて、同報配信の呼量の多い時間帯には各無線送受信部で同じキャリアを送信させることも可能である。
【０１０２】
【発明の効果】
本発明によれば、無線基地局装置及び各アンテナ間の信号伝送を光伝送路（光ファイバ）によるデジタル伝送を行う利点を確保しながら、サービス形態に応じたアンテナ対応のセル構成の変更をハード変更なしで実現し、サービス形態を臨機応変に変更可能とすることができる。
【図面の簡単な説明】
【図１】本発明の無線基地局システムの一実施の形態を示すシステム構成図である。
【図２】図１に示す無線基地局装置の詳細なブロック構成例を示す図である。
【図３】図１に示す無線送受信部の詳細なブロック構成例を示す図である。
【図４】光ファイバの伝送信号のフレームフォーマット例を示す図である。
【図５】通常時の光スイッチ部の接続状態を示す図である。
【図６】故障時の光スイッチ部の接続状態を示す図である。
【図７】各無線送受信部に異なるキャリアを割り当てた場合のサービス形態（セル構成）の一例を示す図である。
【図８】各無線送受信部に同じキャリアを割り当てた場合のサービス形態（セル構成）の一例を示す図である。
【図９】複数の無線送受信部の組みごとに同じ複数のキャリアを複数組み分、割り当てた場合のサービス形態（セル構成）の一例を示す図である。
【符号の説明】
１送信ベースバンド信号処理部
２制御部（ＣＰＵ）
３合成部
４シリアライザ部
５電気／光変換部
６光／電気変換部
７デシリアライザ部
８リタイミング部
９分離部
１０受信ベースバンド信号処理部
１１光スイッチ部
１２，２６光／電気変換部
１３，２７デシリアライザ部
１４，２８リタイミング部
１５，１８分離部
１６，２９シリアライザ部
１７，３０電気／光変換部
１９制御部（ＣＰＵ）
２０送信無線処理部
２２アンテナ部
２３受信無線処理部
２４，２５合成部
３１，３２，３３，３４スイッチ
１０１無線基地局装置
１０２，１０３，１０４，１０５無線送受信部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a radio base station apparatus for controlling transmission and reception of a radio signal to and from a mobile terminal apparatus by an antenna provided at a remote location, and an optical transmission path (optical fiber) for transmitting a digital signal from the radio base station apparatus. The present invention relates to a wireless transmission / reception unit that is sequentially connected in cascade and communicates with a wireless base station apparatus for wireless signals transmitted and received through an antenna, a wireless base station system including them, and a remote antenna signal transmission control method.
[0002]
[Prior art]
Conventionally, in a wireless base station system in which a plurality of wireless antennas are distant, a wireless base station device and a wireless antenna are connected by a coaxial cable to transmit and receive analog wireless signals. In the case of this method, the signal loss is large and it is not suitable for long-distance transmission (for example, see Patent Document 1).
[0003]
Therefore, a method has been used in which a wireless base station apparatus and a wireless antenna are connected by an optical transmission line (optical fiber), and an analog wireless signal is converted into an optical signal and transmitted. Even in the case of this method, since an analog distributor is required to connect to a plurality of wireless antennas, the distribution loss is large and it is not suitable for long-distance transmission. In addition, since the dynamic range of the optical signal is limited due to the analog wireless signal, it is difficult to secure the dynamic range. For this reason, a system has been proposed in which a wireless signal is digitized and transmitted through an optical fiber (for example, see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-6-98046 (page 1-2, FIGS. 1, 5, 7)
[Patent Document 2]
JP-T-8-510878 (pages 36, 82, 87, FIGS. 2, 42, 47)
[0005]
[Problems to be solved by the invention]
In the above-described conventional system for transmitting and receiving signals from one wireless base station to a plurality of remote antennas (the technologies described in Patent Documents 1 and 2), all antennas correspond to the same channel (carrier, radio frequency). The use of different carriers between antennas makes it impossible to flexibly change the cell configuration according to the service mode.
[0006]
An object of the present invention is to provide a wireless base station system in which a plurality of wireless antennas are distant from one wireless base station apparatus, and perform signal transmission between the wireless base station apparatus and each antenna by digital transmission using an optical transmission line (optical fiber). Base station system that realizes a change in the cell configuration corresponding to the antenna according to the service mode without changing the hardware while securing the advantage of performing the service, and enables the service mode to be changed flexibly, and a radio base station apparatus used therefor And a wireless transmission / reception unit, and a signal transmission control method of the remote antenna.
[0007]
[Means for Solving the Problems]
A wireless base station system according to claim 1 of the present invention, a wireless base station device that controls transmission and reception of a wireless signal to and from a mobile terminal device using an antenna provided at a remote location, each having the antenna, A radio base station comprising: a plurality of radio transmission / reception units sequentially connected in tandem from the radio base station device by an optical transmission path for transmitting digital signals and communicating with the radio base station device for radio signals transmitted / received through the antenna In the system, as signals to be transmitted and received on the optical transmission line, a synchronization code for synchronizing frames, a plurality of baseband signals indicating amplitude data of radio signals of a plurality of carriers, and control of each of the radio transmission / reception units. A control signal indicating information is time-division multiplexed on a frame basis into a transmission multiplex signal and a reception multiplex signal, and the base station apparatus transmits and receives the radio transmission and reception signals. A control signal indicating an operation instruction and a carrier assignment instruction for each of the wireless transmission / reception units using a wireless transmission / reception unit identification number assigned to the unit and a carrier identification number assigned to each carrier; and a transmission signal for each carrier. Means for inserting a baseband signal corresponding to the carrier signal into the transmission multiplexed signal to the optical transmission line, and extracting a baseband signal corresponding to the reception signal of each carrier from the reception multiplexed signal from the optical transmission line. Each of the wireless transmitting / receiving units extracts the control signal addressed to the own device from the transmission multiplexed signal from the optical transmission path based on the wireless transmitting / receiving unit identification number pre-assigned to the own wireless transmitting / receiving unit, and sends the control signal to the own device. Recognize the assigned carrier identification number and, based on the corresponding carrier identification number, respond to the transmission multiplex signal from the optical transmission line. Extracts the baseband signal is a transmission signal of the carrier comprises means for inserting a base band signal is a received signal of the corresponding carrier to the received multiplexed signal to the optical transmission line.
[0008]
A radio base station apparatus according to a second aspect of the present invention is the radio base station apparatus used in the radio base station system according to the first aspect, wherein a higher-level interface unit that manages an interface with a higher-level control apparatus; A control unit that performs overall control; and a baseband signal processing unit that processes a transmission / reception signal with the mobile terminal device, wherein the baseband signal processing unit generates a transmission baseband signal from transmission data to the mobile terminal device A transmission baseband signal processing unit, and a reception unit that receives a reception control signal from the wireless transmission and reception unit, processes various setting responses and status monitoring responses of each wireless transmission and reception unit, and generates a corresponding transmission control signal. The transmission baseband signal output from the transmission baseband signal processing means and the transmission control signal output from the control means are input and multiplexed. A synthesizing unit, a serializer unit that receives the synthesized transmission multiplex signal as input, and converts the parallel data into serial data, and a transmission multiplex signal that is converted into serial data as input, converts an electric signal into an optical signal, and transmits the optical signal. An optical-to-optical converter for outputting to a path, an optical-to-electrical converter for receiving a multiplexed signal received from the optical transmission line and converting an optical signal to an electric signal, Deserializer means for converting serial data into parallel data as input, receiving multiplexed signal converted to parallel data as input, retiming means for performing retiming, and receiving remultiplexed received multiplexed signal as input. Separating means for separating a band signal and a reception control signal and outputting the reception control signal to the control means; As input received baseband signal, and a reception baseband processing means for restoring the received data from the mobile terminal device.
[0009]
The radio base station apparatus according to claim 3 of the present invention is the radio base station apparatus according to claim 2, wherein the reception baseband signal processing means performs error correction decoding, framing, data demodulation, and despreading processing, When the amplitude data of a plurality of wireless transmission / reception units are combined and input, bits having the combined amplitude are deleted from the least significant bit position.
[0010]
According to a fourth aspect of the present invention, in the wireless base station device used in the wireless base station system according to the first aspect, the wireless transmission / reception unit is configured to receive a signal from the wireless base station device or a preceding wireless transmission / reception unit through a first optical transmission line. A first optical switch for selecting whether or not to input the input transmission multiplex signal into the own radio transmission / reception unit; and a transmission multiplex signal output from the first optical switch means, First optical / electrical conversion means for converting a signal into an electric signal, first deserializer means for receiving the transmission multiplexed signal converted into the electric signal and converting serial data into parallel data, and converting the signal into parallel data First retiming means for inputting the transmitted multiplexed signal and performing retiming, and inputting the retimed transmission multiplexed signal and receiving the transmission baseband signal and receiving control signal; A first separating unit for separating a signal, one of the separated transmission multiplexed signals as input, a first serializer for converting parallel data into serial data, and a transmission multiplexed signal converted to serial data as input A first electrical / optical converter for converting an electrical signal into an optical signal and outputting the same; a transmission multiplex signal output from the first electrical / optical converter and a transmission input from the first optical transmission line. A second optical switch for selectively outputting any one of the multiplexed signals to a downstream wireless transmission / reception unit through a second optical transmission line; and an input of the other of the transmission multiplexed signals separated by the first demultiplexing unit. A second separating unit that separates a transmission control signal and a transmission baseband signal, performs various settings and status requests by using the separated transmission control signals as inputs, and performs various setting responses and status report responses. A control unit for generating a reception control signal, a transmission radio processing unit for receiving the transmission baseband signal separated by the second separation unit and generating a transmission radio signal, and a transmission output from the transmission radio processing unit An antenna unit which receives a radio signal and outputs it as a radio signal to the outside, and outputs a reception radio signal input as a radio signal from the outside; and a reception baseband signal which receives the reception radio signal output from the antenna unit as an input. Receiving radio processing means for generating a reception baseband signal output from the reception radio processing means and a reception control signal output from the control means, and a first combining means for multiplexing as a reception multiplex signal; Selecting whether to input the reception multiplexed signal input from the subsequent wireless transmission / reception unit through the second optical transmission line into the own wireless transmission / reception unit. Third optical switch means for selecting, a second optical / electrical conversion means for receiving the multiplexed signal output from the third optical switch means, and converting the optical signal into an electric signal, A second deserializer for inputting the received multiplexed signal converted to the input and converting the serial data to parallel data, and a second retiming means for inputting the received multiplexed signal converted to the parallel data and performing retiming; Receiving the multiplexed signal output from the first synthesizing means and the multiplexed signal output from the second retiming means as inputs, multiplexing the second multiplexed signal, and multiplexing the multiplexed received multiplexed signal. Second serializer means for converting parallel data into serial data as input, and receiving multiplexed signal converted into serial data as input and converting electrical signals into optical signals A second electrical / optical converter for outputting, and one of the received multiplexed signal output from the second electrical / optical converter and the received multiplexed signal input from the second optical transmission line, And a fourth optical switch means for selectively outputting to the wireless base station apparatus or the preceding wireless transmission / reception unit through one optical transmission line.
[0011]
The wireless transmitting / receiving unit according to claim 5 of the present invention is the wireless transmitting / receiving unit according to claim 4, wherein the first to fourth optical switch means alone constitute an optical switch unit, and the optical switch unit operates during normal operation and during failure. The optical switch unit of the optical switch unit is switched so that, in the event of a failure, other than the optical switch unit is connected to the wireless base station apparatus and other wireless transceiver units without passing through the failed wireless transceiver unit.
[0012]
A wireless transmitting / receiving unit according to a sixth aspect of the present invention is the wireless transmitting / receiving unit according to the fourth aspect, wherein a clock extracted from the input serial data by the first deserializer means is used as a reference clock, so that the wireless base station apparatus Frequency synchronization.
[0013]
A wireless transmitting / receiving unit according to claim 7 of the present invention is the wireless transmitting / receiving unit according to claim 4, wherein the first separating unit transmits the same data to both the first serializer unit and the second separating unit. By outputting the data, the other wireless transmission / reception units have a configuration in which the same data can be extracted.
[0014]
In a wireless transmission / reception unit according to claim 8 of the present invention, in the wireless transmission / reception unit according to claim 4, the second synthesizing unit matches the timing position of the synchronization code between the own wireless transmission / reception unit and each of the other wireless transmission / reception units. In this case, the position of the reception control signal and the position of the reception baseband signal are recognized and multiplexed.
[0015]
According to a ninth aspect of the present invention, in the wireless transmission / reception unit according to the fourth aspect, the second combining unit is configured to receive the same carrier by a plurality of wireless transmission / reception units. It has a configuration for adding signal amplitudes.
[0016]
A wireless transmitting / receiving unit according to a tenth aspect of the present invention is the wireless transmitting / receiving unit according to the ninth aspect, wherein the adding method has a configuration in which the amplitudes of the wireless transmitting / receiving units are all added at the same amplitude level.
[0017]
According to a remote antenna signal transmission control method according to claim 11 of the present invention, a wireless base station apparatus for controlling transmission and reception of a wireless signal to and from a mobile terminal apparatus using an antenna provided at a remote location, and each of the wireless base station apparatuses includes the antenna. And a plurality of wireless transmission / reception units that are sequentially connected in tandem from the wireless base station device by an optical transmission path for transmitting digital signals and perform communication with the wireless base station device for wireless signals transmitted / received through the antenna. In the remote antenna signal transmission control method in the base station system, as a signal transmitted and received on the optical transmission line, a synchronization code for synchronizing a frame and a plurality of baseband signals indicating amplitude data of radio signals of a plurality of carriers. A transmission multiplexed signal obtained by time-division multiplexing a control signal indicating control information for An operation instruction and a carrier assignment for each of the radio transmission / reception units using a radio transmission / reception unit identification number assigned to each of the radio transmission / reception units and a carrier identification number assigned to each of the carriers in the base station apparatus as a multiplexed signal. The control signal indicating the instruction and the baseband signal corresponding to the transmission signal of each carrier are inserted into the transmission multiplexed signal to the optical transmission line, and each of the radio transmission / reception units is assigned in advance to its own radio transmission / reception unit. The control signal addressed to the own device is extracted from the transmission multiplexed signal from the optical transmission line based on the wireless transmitting / receiving unit identification number, and the carrier identification number assigned to the own device is recognized, based on the corresponding carrier identification number. Extracting a baseband signal which is a transmission signal of a corresponding carrier from the transmission multiplexed signal from the optical transmission line, and A baseband signal, which is a received signal of a carrier, is inserted into a received multiplex signal to the optical transmission line, and the base station apparatus multiplexes a baseband signal corresponding to the received signal of each carrier from the optical transmission line. Extracting from the signal.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
First, the outline of the present invention will be described. The present invention relates to a radio base station system in which a plurality of transmitting and receiving antennas are distant, a transmission signal between the radio base station apparatus and each of the transmitting and receiving antennas is converted into a digital signal, By separating the digital signals of a plurality of transmitting and receiving antennas on the side, the wireless base station apparatus can be connected to the plurality of transmitting and receiving antennas at the input / output terminal of one optical transmission line (optical fiber), and the digital signal is converted to a baseband signal. And a control signal, and by assigning a digital signal relationship between the radio base station apparatus and each transmitting / receiving antenna according to the cell configuration, it is possible to change the cell configuration according to the service mode without changing the hardware. Further, since a digital signal is transmitted between the wireless base station device and the transmitting / receiving antenna, there is no power loss, and a high dynamic range is possible in power control.
[0019]
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0020]
FIG. 1 is a system configuration diagram showing an embodiment of a radio base station system according to the present invention, and shows an example in which the present invention is applied to a W-CDMA (Wideband-Code Division Multiple Access) -based mobile communication system. Show. In FIG. 1, the wireless base station system of the present example is connected to a higher-level control device (not shown), and is cascaded to the wireless base station device 101 under the control thereof by an optical transmission line. And a plurality of (four in the figure) wireless transmitting and receiving units 102 to 105 each including an antenna for performing wireless transmission and reception using a radio frequency signal corresponding to a carrier (radio carrier) allocated to each mobile device (mobile terminal device). I have. That is, the wireless base station apparatus 101 is connected to the first wireless transmission / reception unit 102 by one optical fiber for each input and output. The first wireless transmission / reception unit 102 is connected to the second wireless transmission / reception unit 103 by one input / output optical fiber. The second wireless transmission / reception unit 103 is connected to the third wireless transmission / reception unit 104 by one input / output optical fiber. The third wireless transmission / reception unit 104 is connected to the fourth wireless transmission / reception unit 105 via one input / output optical fiber.
[0021]
Although not shown in detail, the radio base station apparatus 101 controls an interface with a higher-level control device (for example, a radio network control device) and transmits and receives a user signal and a control signal to and from a mobile device. Baseband signal processing means connected to the interface means for performing error correction coding / decoding, framing, data modulation / demodulation, and spreading / despreading of a user signal (baseband signal) for the mobile station; The apparatus includes an inter-device interface unit that controls an interface with the wireless transmission / reception units 102 to 105 and transmits and receives a baseband signal, and a control unit that controls the upper interface unit, the baseband signal processing unit, and the inter-device interface unit. .
[0022]
Each of the wireless transmission / reception units 102 to 105 manages an interface with the wireless base station device 101 or another adjacent wireless transmission / reception unit, and inter-device interface means for transmitting / receiving a baseband signal, and a baseband / radio frequency signal transmission / reception unit. The wireless communication device includes a wireless processing unit that performs a conversion and performs a wireless interface with a mobile device located in a cell formed corresponding to an antenna, an inter-device interface unit, and a control unit that controls the wireless processing unit.
[0023]
The higher-level control device of the radio base station system (radio base station device 101) is further connected to an exchange of the core network, which is the higher-level device, and controls another control device, a plurality of subordinate radio base station systems, and a plurality of mobile units. And a mobile communication system. Other networks accommodating user terminals can also be connected to the core network, enabling communication between the user terminals and mobile devices or between mobile devices.
[0024]
FIG. 2 is a diagram showing an example of a detailed block configuration of the wireless base station device 101, and shows only parts related to the present invention.
[0025]
In FIG. 2, a radio base station apparatus 101 of the present example generates a transmission baseband signal and outputs a transmission baseband signal, and generates and outputs a transmission control signal, and inputs a reception control signal and controls A control unit (CPU) 2 for processing signals, a transmission baseband signal output from the transmission baseband signal processing unit 1 and a transmission control signal output from the CPU 2 are input, and these are combined and output as a transmission multiplex signal. A serializing section 4 for inputting the transmission multiplex signal output from the synthesizing section 3, converting parallel data into serial data and outputting the serial data, and a transmission multiplex signal output from the serializer section 4; An electric / optical conversion unit 5 that converts an electric signal into an optical signal and outputs it to the wireless transmitting / receiving unit 102 through an optical transmission line (fiber); An optical-to-electrical converter 6 that receives the multiplexed signal output from the receiver 102, converts the optical signal into an electric signal, and outputs the multiplexed signal, and receives the multiplexed signal that is output from the optical / electrical converter 6, A deserializer unit 7 that converts serial data into parallel data and outputs the received data, a retiming unit 8 that receives and retimers a received multiplexed signal output from the deserializer unit 7, and receives a signal that is output from the retiming unit 8. A demultiplexing unit that inputs a multiplexed signal, outputs a reception control signal to the CPU 2 and outputs a reception baseband signal, and receives a reception baseband signal output from the separation unit 9 and processes the reception baseband signal And a receiving baseband signal processing unit 10.
[0026]
FIG. 3 is a diagram illustrating a detailed block configuration example of the wireless transmission / reception unit 102. The other wireless transmission / reception units 103 to 105 have the same configuration.
[0027]
In FIG. 3, the wireless transmission / reception unit 102 of the present example receives a transmission multiplexed signal output from the wireless base station device 101 through an optical transmission line (fiber), and selects and outputs the switch (first switch) of the optical switch unit 11. Switch) 31, an optical / electrical conversion unit (first optical / electrical conversion unit) 12 that receives one of the transmission multiplexed signals output from the switch 31, converts an optical signal into an electric signal, and outputs the electric signal. A deserializer unit (first deserializer unit) 13 that receives the transmission multiplex signal output from the electric conversion unit 12 and converts serial data into parallel data, and outputs the transmission multiplex signal output from the deserializer unit 13. A re-timing unit (first re-timing unit) 14 for inputting, re-timing and outputting, and a transmission multiplexed signal output from the re-timing unit 14, A separation unit (first separation unit) 15 for separating and outputting, and a serializer unit (first serializer) for receiving one of the transmission multiplexed signals output from the separation unit 15 and converting parallel data into serial data and outputting the serial data ) 16, an electrical / optical converter (first electrical / optical converter) 17 that receives the transmission multiplexed signal output from the serializer 16, converts the electrical signal into an optical signal, and outputs the optical signal. The switch (second switch) of the optical switch unit 11 that receives the transmission multiplexed signal output from the optical conversion unit 17 and the other transmission multiplexed signal output from the switch 31 and selectively outputs it to the next (later) wireless transmission / reception unit 103 ) 32, a demultiplexing unit (second demultiplexing unit) 18 that receives the other transmission multiplexed signal output from the demultiplexing unit 15 and demultiplexes and outputs a transmission control signal and a transmission baseband signal. A control unit (CPU) 19 for inputting the transmission control signal output from the control unit, processing the control signal, and generating and outputting the reception control signal, and the transmission baseband signal output from the separation unit 18; A transmission radio processing unit 20 for generating and outputting a transmission radio signal, and a transmission radio signal from the transmission radio processing unit 20 input to a first port (input / output end) is output to a second port, and an antenna unit 22 And a circulator unit 21 that outputs a reception radio signal from the antenna unit 22 input to the second port to the third port and transmits the reception radio signal to the reception radio processing unit 23, and a transmission radio signal output from the circulator unit 21 An antenna unit 22 which receives the radio wave signal from the outside and radiates the radio wave signal to the outside (mobile device), and receives the radio wave signal input from the outside and outputs it to the circulator unit 21 as a reception radio signal; The reception radio signal output from the antenna unit 22 is input through the circulator unit 21 and the reception radio processing unit 23 outputs a reception baseband signal; the reception baseband signal output from the reception radio processing unit 23 and the reception radio signal output from the CPU 19. (First combining unit) 24 that receives and multiplexes the received reception control signal and outputs the received multiplexed signal, and receives and selects the received multiplexed signal output from the next-stage wireless transmission / reception unit 103. A switch (third switch) 33 of the optical switch unit 11 for output, and one of the received multiplexed signals output from the switch 33 are input, and an optical / electrical conversion unit (first / second) that converts an optical signal into an electric signal and outputs the electric signal. And a deserializer that receives the multiplexed signal output from the optical / electrical converter 26, converts serial data into parallel data, and outputs the parallel data. A second deserializer unit 27, a retiming unit (second retiming unit) 28 that receives the received multiplexed signal output from the deserializer unit 27, performs retiming, and outputs the multiplexed signal. A combining unit (second combining unit) 25 that receives the output multiplexed signal and the received multiplexed signal output from the retiming unit 28, multiplexes and outputs the multiplexed signal, and a received multiplexed signal output from the combining unit 25. A serializer unit (second serializer unit) 29 for inputting and converting parallel data into serial data and outputting the received multiplexed signal output from the serializer unit 29, converting an electric signal to an optical signal and outputting Electrical / optical converter (second electrical / optical converter) 30 and the reception multiplexed signal output from the electrical / optical converter 30 and the other reception output from the switch 33 Enter the heavy signal, and a switch (fourth switch) 34 of the optical switch 11 for selectively outputting the radio base station apparatus 101.
[0028]
As described above, the configuration of the other wireless transmission /

reception units

103, 104, and 105 is the same as the configuration of the wireless transmission / reception unit 102, and the names of the external devices on the upstream and downstream sides connected to the optical switch unit 11 ( The radio base station apparatus 101 and the radio transmission / reception unit 103 may be appropriately replaced with the radio transmission /

reception units

102 and 104, the radio transmission /

reception units

103 and 105, and the radio transmission / reception unit 104 (however, the last-stage radio transmission / reception unit 105). Is connected only to the wireless transmission / reception unit 104 in the preceding stage).
[0029]
Next, the operation of the embodiment of the present invention will be described in more detail. Here, a W-CDMA wireless base station apparatus (chip rate of 3.84 Mbps) used in a mobile communication system and an apparatus configuration in which four transmitting and receiving antennas are located far away will be described as an example. In addition, an optical fiber suitable for long-distance transmission is used between the radio base station apparatus and each radio transmission / reception section and between the radio transmission / reception section and another radio transmission / reception section, and serial transmission is performed at a transmission rate of around 1.25 Gbps. An example will be described.
[0030]
First, the flow of a transmission signal will be described with reference to FIGS.
[0031]
The transmission baseband signals for four carriers generated by the transmission baseband signal processing unit 1 shown in FIG. Further, the CPU 2 outputs a transmission control signal for performing various settings and status monitoring of the wireless transmission / reception units 102 to 105 to the synthesis unit 3.
[0032]
The combining unit 3 multiplexes the transmission baseband signal and the transmission control signal for four carriers. In multiplexing, as shown in FIG. 4, one unit is a frame, and a synchronization code (2 bytes) is added to the beginning of the frame. The synchronization code is used to detect the data position of each carrier (8 bytes) of the transmission baseband signal and the data position of the transmission control signal (6 bytes). Also, a transmission control signal is added at the time following the synchronization code. At this time, since the transmission baseband signal is amplitude data, continuous transmission is necessary, and the transmission control signal has a smaller data amount than the transmission baseband signal. By adding a transmission control signal for one carrier, the band of the transmission baseband signal is secured as much as possible.
[0033]
As shown in Table 1, the transmission control signal includes a number bit (bit), which is a radio transmission / reception unit identification number assigned in advance to distinguish each of the radio transmission / reception units 102 to 105, as shown in Table 2. , An identification bit (bit) which is a carrier identification number assigned in advance to distinguish each of the carriers 1 to 4 (including a combination thereof).
[0034]
[Table 1]

[0035]
[Table 2]

[0036]
Each of the wireless transmission / reception units 102 to 105 has its own number set in advance by a DIPSW (dualinline package switch) or the like.
[0037]
Further, the transmission baseband signals of carrier 1, carrier 2, carrier 3, and carrier 4 are added at the time following the transmission control signal. In the case of transmission diversity, the transmission baseband signal is composed of the 0-system / 1-system and is composed of I / Q amplitude data information. Approximately bytes are required. That is, 8 bytes of information are required per carrier.
[0038]
In addition, since amplitude data must be transmitted continuously and optical fiber transmission is usually performed by 8B / 10B encoding / decoding to 8/10 bits and 10-bit serial transmission is performed, the The transmission rate of the transmission baseband signal required for the four carriers is “(3.84 × 10 ⁶ ) Mbps × 8 bytes × 4 carriers × 10 bits = 1.2288 Gbps ”.
[0039]
Here, since the optical / electrical / electrical / optical conversion unit near the transmission rate of 1.25 Gbps is generally inexpensive, considering serial transmission near 1.25 Gbps, the synchronization code and the transmission control signal are The allocated band is “1.25 Gbps−1.2288 Gbps = 212 Mbps”.
[0040]
Therefore, as shown in FIG. 4, the actual transmission rate is one amplitude data (3.84 Mbps) for four carriers of the transmission baseband signal as one group, for example, a synchronization code of 2 bytes, a transmission control signal of 6 bytes, and a transmission control signal of 6 bytes. When 16 groups of baseband signals are transmitted as one frame, the number of bytes per frame is “2 (synchronization code) +6 (transmission control signal) + 16 × 32 (transmission baseband signal) = 520 bytes”. Assuming that transmission is performed at 1.25 Gbps, “1.25 Gbps / 520 bytes = 240384846.154 frames” will be transmitted in one second. When a rate having a common multiple is selected, by setting “520 bytes × 2400000 frames = 1.248 Gbps”, transmission near 1.25 Gbps becomes possible while continuously transmitting a transmission baseband signal.
[0041]
Next, the transmission multiplex signal output from the combining unit 3 is input to the serializer unit 4 and converted into serial data. The transmission multiplex signal converted into the serial data is input to the electrical / optical converter 5 and is converted from an electrical signal to an optical signal. The transmission multiplex signal converted into the optical signal is output to the wireless transmission / reception unit 102 shown in FIG. 3 via the optical fiber.
[0042]
In the wireless transmission / reception unit 102, a transmission multiplex signal from the wireless base station device 101 is input to the switch 31 of the optical switch unit 11. As shown in FIG. 5, the switch 31 is connected to the optical / electrical converter 12 during normal times (when the failure detection signal is at the H (high) level). Is output to
[0043]
Further, when the wireless transmission / reception unit 102 fails, as shown in FIG. 6, the transmission multiplexed signal output from the wireless base station apparatus 101 only passes through the optical switch unit 11 of the wireless transmission / reception unit 102, and the wireless transmission / reception unit 103 The switch 31 and the switch 32 are connected and operated so that the signals can be output to the wireless communication units 103 to 105 so as not to affect the other wireless transmission / reception units 103 to 105. At the same time, the switch 33 and the switch 34 are switched and connected to each other and operated, and the signals (received multiplexed signals) from the other wireless transmission / reception units 103 to 105 only pass through the optical switch unit 11 and the radio base station apparatus 101 to be output.
[0044]
To switch the switches 31 to 34 when the wireless transmission / reception unit 102 fails, the failure detection signal supplied to the optical switch unit 11 is switched from H level to L (low) level to connect the switches 31 to 34. What is necessary is just to make the structure which switches a point. The failure detection signal is generated by a failure detection unit (not shown).
[0045]
Next, the description of the normal operation will be continued. The transmission multiplex signal is input to the optical / electrical conversion unit 12, and is converted from an optical signal to an electric signal. The transmission multiplex signal converted into the electric signal is input to the deserializer unit 13 and converted into parallel data. Also, since a normal deserializer can extract a CLK (clock) synchronized with serial data on the transmission side, by using this CLK as a reference CLK of the radio transmission / reception unit 102, the radio base station apparatus 101 and the radio transmission / reception unit 102 Can be synchronized.
[0046]
The transmission multiplex signal converted into the parallel data is input to the retiming unit 14. The retiming unit 14 can operate with the CLK from which the jitter has been removed in the subsequent stage by converting the reference CLK of the wireless base station apparatus 101 to the reference CLK of the wireless transmission / reception unit 102. Inserted to make it easier.
[0047]
Next, the transmission multiplex signal is input to the separation unit 15. At this time, the demultiplexing unit 15 outputs one of the transmission multiplexed signals to the serializer unit 16 and the other to the demultiplexing unit 18. By outputting the same data to both, the other radio transmitting and receiving units 103 to 105 also output the multiplexed signal. The same data as that of the wireless transmission / reception unit 102 can be extracted.
[0048]
One of the transmission multiplex signals input to the serializer unit 16 is converted into serial data and input to the electrical / optical converter 17. The transmission multiplex signal input to the electrical / optical conversion unit 17 is converted into an optical signal and input to the switch 32 of the optical switch unit 11. The switch 32 is normally connected to the wireless transmitting / receiving unit 103 as shown in FIG.
[0049]
Also, as shown in FIG. 6, when the wireless transmitting / receiving section 102 fails, the switch 31 and the switch 32 are connected so that the transmission multiplexed signal output from the wireless base station apparatus 101 can be directly output to the wireless transmitting / receiving section 103 and thereafter. By operating, the multiplex signal transmitted via the electrical / optical converter 17 is not output anywhere.
[0050]
Next, the other of the transmission multiplexed signals output from the demultiplexer 15 is input to the demultiplexer 18. The separation unit 18 separates the transmission control signal and the transmission baseband signal, but extracts only the signal addressed to the wireless transmission / reception unit 102 at this time. In the extraction method, the position of the transmission control signal and the position of the transmission baseband signal are recognized from the position of the synchronization code. In the case of the transmission control signal, the number bit is allocated in the transmission control signal as shown in Table 1. Then, it becomes possible to extract the transmission control signal in which the setting of its own DIPSW and the number bit match.
[0051]
Also, in the case of a transmission baseband signal, if a number bit is allocated in the transmission baseband signal, the band will be widened. Therefore, in order to avoid useless bandwidth, the relationship between the number bit and the identification bit must be set in advance when starting up the device. Is transmitted by the transmission control signal, it is possible to determine the byte number to be extracted from the synchronization code of the transmission baseband signal addressed to the own wireless transmission / reception unit, and the extraction is possible.
[0052]
Table 3 shows that the carrier assignment of each of the wireless transmission / reception units 102 to 105 is assigned to carrier 1 (identification bit 000), carrier 2 (identification bit 001), carrier 3 (identification bit 011), and carrier 4 (identification bit 100), respectively. This is an example of a case where FIG. 7 shows the cell configuration at that time. In this case, a maximum of one carrier can be transmitted by one radio transmitting / receiving unit.
[0053]
[Table 3]

[0054]
Further, as shown in Table 4, all of the wireless transmission / reception units 102 to 105 can be assigned to carrier 1 (identification bit 000). FIG. 8 shows the cell configuration at that time. At this time, a maximum of one carrier can be transmitted by one radio transmitting / receiving unit. In addition, all the carriers 1 to 4 (identification bits 111) can be allocated to each of the wireless transmission / reception units 102 to 105. In this case, transmission of up to four carriers is possible for one radio transmitting / receiving unit.
[0055]
[Table 4]

[0056]
By performing such control, the CPU 19 can process only the transmission control signal addressed to the own wireless transmission / reception unit, and the transmission wireless processing unit 20 and thereafter can process only the transmission baseband signal addressed to the own wireless transmission / reception unit. .
[0057]
Next, the transmission baseband signal input to the transmission radio processing unit 20 is subjected to digital / analog conversion, frequency conversion, and output to the circulator unit 21 as a transmission radio signal. The transmission radio signal input to the circulator unit 21 is output to the antenna unit 22. This transmission radio signal is not output to the reception radio processing unit 23.
[0058]
The transmission radio signal input to the antenna unit 22 is output to the outside as a radio signal of a corresponding carrier, and transmitted to a mobile device (terminal device).
[0059]
Note that the operations of the wireless transmission /

reception units

103 and 104 at the subsequent stage perform the same operations as those of the wireless transmission / reception unit 102 with the transmission multiplexed signals output from the wireless transmission /

reception units

102 and 103 at the preceding stage as inputs. The operation of the wireless transmission / reception section 105 in the final stage is the same as that of the wireless transmission / reception section 102 except that the transmission multiplexed signal output from the wireless transmission / reception section 104 is input and the transmission multiplexed signal is not output anywhere.
[0060]
Next, the flow of a received signal will be described with reference to FIGS.
[0061]
The radio signal (received radio signal) of the corresponding carrier transmitted from the external mobile device (terminal device) is input to the antenna unit 22 shown in FIG. The received wireless signal input to the antenna unit 22 is output to the circulator unit 21. The received wireless signal input to circulator section 21 is output to received wireless processing section 23. The reception radio signal is not output to the transmission radio processing unit 20.
[0062]
The reception radio signal input to the reception radio processing unit 23 is subjected to frequency conversion, analog / digital conversion, and output to the synthesis unit 24 as a reception baseband signal.
[0063]
Further, the CPU 19 outputs to the synthesizing unit 24 a reception control signal for performing various setting responses and status monitoring responses to the wireless base station device 101.
[0064]
The combining unit 24 multiplexes the reception control signal and the reception baseband signal. In the multiplexing method, as in the case of the transmission signal, as shown in FIG. 4, one unit is a frame, and a synchronization code is added to the beginning of the frame. The synchronization code is used to detect each carrier of the reception baseband signal and the data position of the reception control signal. Also, a reception control signal is added at the time following the synchronization code. At this time, since the received baseband signal is amplitude data, continuous transmission is necessary, and the reception control signal is smaller in data amount than the received baseband signal. By adding a reception control signal for one carrier, the band of the reception baseband signal is secured as much as possible. In addition, the reception control signal includes a number bit for distinguishing the wireless transmission / reception units 102 to 105 as shown in Table 1 and an identification bit for distinguishing each carrier as shown in Table 2.
[0065]
In addition, the reception baseband signals of carrier 1, carrier 2, carrier 3, and carrier 4 are allocated to the time following the reception control signal. The reception baseband signal usually has reception diversity, is composed of the 0 system / 1 system, and is composed of I / Q amplitude data information. Therefore, unlike the transmission side, the reception side requires a large dynamic range. In general, each requires about 1 byte.
[0066]
However, as shown in Table 3, the radio transmission / reception units 102 to 105 may be all different carriers, but if the radio transmission / reception units 102 to 105 are all the same carrier as shown in Table 4, the amplitudes are added. There is a need. Therefore, 2 bytes are allocated. That is, 16 bytes of information per carrier are required as in the transmitting side.
[0067]
In addition, since amplitude data must be transmitted continuously, and transmission through an optical fiber is usually converted into 8/10 bits by 8B / 10B encoding / decoding, and serial transmission of 10 bits is performed, transmission over optical fibers is difficult. The transmission rate of the received baseband signal required for the four carriers is “(3.84 × 10 ⁶ ) Mbps × 8 bytes × 4 carriers × 10 bits = 1.2288 Gbps ”.
[0068]
Here, considering serial transmission near the transmission rate of 1.25 Gbps, the band allocated to the synchronization code and the reception control signal is “2.25 Gbps−1.2288 Gbps = 212 Mbps”. Therefore, as shown in FIG. 4, when one amplitude data (3.84 Mbps) for four carriers of the reception baseband signal is taken as one group, for example, a synchronization code of 2 bytes, a reception control signal of 6 bytes, and a reception baseband signal are transmitted. When 16 groups are transmitted as one frame, transmission at around 1.25 Gbps becomes possible while continuously transmitting the reception baseband signal, similarly to the transmission baseband signal.
[0069]
Next, the received multiplex signal output from the combining unit 24 is input to the combining unit 25. Further, the reception multiplex signal output from the next-stage wireless transmission / reception unit 103 is input to the switch 33 of the optical switch unit 11. Since the switch 33 is normally connected to the optical / electrical converter 26 as shown in FIG. 5, it is output to the optical / electrical converter 26.
[0070]
Also, as shown in FIG. 6, when the wireless transmission / reception unit 102 fails, the reception multiplexed signal output from the wireless transmission / reception unit 103 can be output to the wireless base station apparatus 101 only through the optical switch unit 11 of the wireless transmission / reception unit 102. The

switches

33 and 34 are connected and operated as described above so that the other wireless transmission / reception units 103 to 105 are not affected.
[0071]
Next, at normal times, the reception multiplex signal is input to the optical / electrical conversion unit 26, and is converted from the optical signal to the electric signal. The received multiplex signal converted into an electric signal is input to the deserializer unit 27 and converted into parallel data. The received multiplex signal converted into parallel data is output to the retiming unit 28.
[0072]
The retiming unit 28 is inserted to convert the reference CLK (clock) of the wireless transmission / reception unit 103 to the reference CLK of the wireless transmission / reception unit 102, thereby facilitating the design in the wireless transmission / reception unit 102.
[0073]
The combining unit 25 multiplexes the reception multiplexed signal multiplexed in the radio transmission / reception unit 102 and the reception multiplexed signal multiplexed in the subsequent radio reception units 103 to 105. The multiplexing method shifts the position (frame timing) of the synchronization code of the reception multiplexed signal multiplexed by the

radio reception units

103, 104, and 105 so as to match the reception multiplexed signal multiplexed in the radio transmission / reception unit 102. Thereafter, the CPU 19 controls the reception control signal so as not to congest with the reception control signals of the other wireless transmission / reception units 103 to 105, and inserts the reception control signal at the time of the control signal.
[0074]
Also, as shown in Table 3, when the radio transmission / reception units 102 to 105 are all different carriers, the reception baseband signal is inserted at a time allocated to each carrier from the position of the synchronization code. . FIG. 7 shows the cell configuration at that time. In this case, a maximum of one carrier can be received by one wireless transmission / reception unit.
[0075]
Further, as shown in Table 4, when all of the wireless transmission / reception units 102 to 105 are the same carrier, the amplitude is added. As for the addition method, the addition is performed when the amplitudes of the wireless transmission / reception units are all the same. That is, if the amplitude of each wireless transmitting / receiving unit is 8 bits and the combined amplitude of the wireless transmitting / receiving

units

103, 104, and 105 input to the wireless transmitting / receiving unit 102 is 10 bits, the position of the LSB (the smallest amplitude bit digit) is set. What is necessary is just to add together.
[0076]
After that, the received baseband signal is inserted at the time allocated to each carrier. FIG. 8 shows the cell configuration at that time. At this time, a maximum of one carrier can be received by one wireless transmission / reception unit. When all of the carriers 1 to 4 (identification bits 111) are assigned to each of the wireless transmitting / receiving units 102 to 105, a maximum of 4 carriers can be received by one wireless transmitting / receiving unit.
[0077]
Next, the received multiplex signal output from the combining unit 25 is input to the serializer unit 29. The received multiplex signal input to the serializer unit 29 is converted into serial data and input to the electrical / optical converter 30. The received multiplex signal input to the electrical / optical conversion unit 30 is converted into an optical signal and input to the switch 34 of the optical switch unit 11.
[0078]
Since the switch 34 is normally connected to the radio base station apparatus 101 as shown in FIG. 5, it is output to the radio base station apparatus 101. Also, as shown in FIG. 6, when the wireless transmitting / receiving unit 102 fails, the switch 33 and the switch 34 are connected so that the received multiplexed signal output from the wireless transmitting / receiving unit 103 can be directly output to the wireless base station apparatus 101. By doing so, the received multiplexed signal output from the electrical / optical converter 30 is not output anywhere.
[0079]
The received multiplex signal output from the wireless transmission / reception unit 102 is input to the optical / electrical conversion unit 6 of the wireless base station device 101 shown in FIG. The received multiplex signal is input to the optical / electrical conversion unit 6, and is converted from an optical signal to an electric signal. The received multiplex signal converted into an electric signal is input to the deserializer unit 7 and converted into parallel data. The received multiplex signal converted into parallel data is output to the retiming unit 8.
[0080]
The retiming unit 8 is inserted to convert the reference CLK (clock) of the radio transmission / reception unit 102 to the reference CLK of the radio base station apparatus 101, thereby facilitating design in the radio base station apparatus 101. I have. Next, the reception multiplex signal is output to the separation unit 9.
[0081]
The separation unit 9 separates the reception control signal and the reception baseband signal. The separation unit 9 recognizes the positions of the reception control signal and the reception baseband signal from the position of the synchronization code. Since the transmission side inserts the number bit in the reception control signal, it is possible to determine which reception control signal belongs to which wireless transmission / reception unit. In the case of a transmission baseband signal, by determining a transmission format in advance as shown in FIG. 4, it is possible to determine which carrier is the reception baseband signal. Therefore, the separation unit 9 can output the reception control signal to the CPU 2 and output the reception baseband signals to the reception baseband signal processing unit 10, respectively.
[0082]
The reception baseband signal processing unit 10 performs error correction decoding, framing, data demodulation, and despreading processing. If all the wireless transmission and reception units 102 to 105 are the same carrier as shown in FIG. Bit limit. For example, when the combined amplitude of the wireless transmission /

reception units

102 and 103 and 104 and 105 is 11 bits, if the amplitude before the combination is 8 bits, 3 bits are deleted from the LSB (smallest amplitude bit), and if the combined amplitude is 8 bits, It can be handled in the same manner as the cell configuration as shown in Table 4. If the four wireless transmission / reception units are considered as one cell even if the bits are deleted, the combined amplitude may be 8 bits.
[0083]
Also, the operations of the wireless transmission /

reception units

103 and 104 are the same as the operations of the wireless transmission / reception unit 102 with the reception multiplexed signals output from the wireless transmission /

reception units

104 and 105 as inputs. The operation of the wireless transmission / reception unit 105 in the final stage is the same as the operation of the wireless transmission / reception unit 102, except that there is no incoming multiplex signal.
[0084]
It should be noted that the optical fiber generally has a single mode and a multimode, but the single mode is more suitable for a high transmission rate and a long distance transmission. In addition, using an optical fiber in which signals for transmission and reception are incorporated one by one in a single mode is advantageous in terms of performance and cost.
[0085]
Next, another embodiment of the present invention will be described in detail with reference to the drawings.
[0086]
In this embodiment, as shown in FIG. 9,

carriers

1 and 2 may be transmitted by

radio transceivers

102 and 103, and carriers 3 and 4 may be transmitted and received by

radio transceivers

104 and 105. In this case, as shown in Table 5, a number bit and an identification bit are assigned.
[0087]
[Table 5]

[0088]
On the transmission side, as in the above-described embodiment, the transmission / reception multiplexed signal transmitted from the radio base station apparatus 101 is input to the radio transmission / reception unit 102, and the position of the transmission control signal and the position of the transmission baseband signal are determined based on the position of the synchronization code. In the case of the transmission control signal, the transmission control signal of only the number bit (00) addressed to the own radio transmission / reception unit is extracted, and the transmission baseband signals of

carriers

1 and 2 are extracted.
[0089]
Further, the wireless transmitting / receiving section 103 recognizes the positions of the transmission control signal and the transmission baseband signal from the position of the synchronization code, and in the case of the transmission control signal, controls only the number bit (01) addressed to the own wireless transmitting / receiving section. A signal is extracted, and transmission baseband signals of

carriers

1 and 2 are extracted.
[0090]
Further, the wireless transmitting / receiving section 104 recognizes the positions of the transmission control signal and the transmission baseband signal from the position of the synchronization code, and in the case of the transmission control signal, controls only the number bit (10) addressed to the own wireless transmitting / receiving section. A signal is extracted, and transmission baseband signals of carriers 3 and 4 are extracted.
[0091]
Further, the wireless transmitting / receiving section 105 recognizes the positions of the transmission control signal and the transmission baseband signal from the position of the synchronization code, and in the case of the transmission control signal, controls only the number bit (11) addressed to the own wireless transmitting / receiving section. A signal is extracted, and transmission baseband signals of carriers 3 and 4 are extracted.
[0092]
On the receiving side, as in the above-described embodiment, the wireless transmitting / receiving section 105 adds a synchronization code to the beginning of the frame, adds its own number bit (11), and transmits the frame at the time of the reception control signal. . Also, the reception baseband signal is transmitted by adding the amplitude data of the carriers 3 and 4 to the time allocated to the carriers 3 and 4.
[0093]
In addition, the wireless transmitting / receiving section 104 shifts the position (frame timing) of the synchronization code of the received multiplexed signal multiplexed by the wireless receiving section 105 to match the received multiplexed signal multiplexed in the wireless transmitting / receiving section 104. Thereafter, the reception control signal is controlled by the CPU 19 so as not to be congested with the reception control signal of the wireless transmission / reception unit 105, while adding its own number bit (10) to the time of the control signal and transmitting it at the time of the reception control signal. Also, since the received baseband signal is assigned to carriers 3 and 4 similar to that of the wireless transmission / reception unit 105, the amplitude data of each carrier is added, and then added to the time assigned to carriers 3 and 4, and then transmitted. .
[0094]
Further, the wireless transmitting / receiving section 103 shifts the position (frame timing) of the synchronization code of the received multiplexed signal multiplexed by the wireless receiving section 104 so as to match the received multiplexed signal multiplexed in the wireless transmitting / receiving section 103. Thereafter, the reception control signal is controlled by the CPU 19 so as not to be congested with the reception control signals of the radio transmission /

reception units

104 and 105, while adding its own number bit (01) to the time of the control signal and transmitting at the time of the reception control signal. I do. Also, the reception baseband signal is transmitted by adding the amplitude data of the

carriers

1 and 2 to the time allocated to the

carriers

1 and 2.
[0095]
Further, the wireless transmission / reception section 102 shifts the position (frame timing) of the synchronization code of the reception multiplexed signal multiplexed by the wireless reception section 103 to match the reception multiplexed signal multiplexed in the wireless transmission / reception section 102. Thereafter, the reception control signal is controlled by the CPU 19 so as not to be congested with the reception control signals of the radio transmission /

reception units

103, 104, and 105, while adding its own number bit (00) to the time of the control signal. Send to Also, since the received baseband signal is assigned to

carriers

1 and 2 similar to that of the radio transmission / reception unit 103, the amplitude data of each carrier is added and then added to the time assigned to

carriers

1 and 2, and then transmitted. .
[0096]
Also, the separating unit 9 of the wireless base station apparatus 101 recognizes the position of the reception control signal and the position of the reception baseband signal from the position of the synchronization code. To distinguish. Further, the reception baseband signal is separated for each carrier and transmitted to the reception baseband signal processing unit 10.
[0097]
Next, the reception baseband signal processing unit 10 limits the added amplitude bit to bits. Each of the

carriers

1 and 2 and 3 and 4 is a combination of the amplitudes of two radio transmitting and receiving units. For example, when the synthesized amplitude is 9 bits, if the amplitude before the synthesis is 8 bits, only the LSB (smallest amplitude bit) may be deleted and set to 8 bits.
[0098]
In FIG. 2, transmission baseband signals for four carriers may be multiplexed by the transmission baseband signal processing unit 1. Similarly, the reception baseband signal for four carriers may be separated by the reception baseband signal processing unit 10.
[0099]
In addition, when there is no transmission diversity, transmission output for eight carriers is possible.
[0100]
Further, the transmission format in FIG. 4 may be different for transmission and reception.
[0101]
Further, if the transmission path is set to 1.248 Gbps or more, it is possible to connect to a plurality of wireless transmission / reception units and to transmit / receive a plurality of carriers.
As described above, according to the embodiment of the present invention, the following effects can be obtained. First, from one radio base station apparatus, a plurality of radio transmission / reception units are connected in tandem with one input / output optical fiber, and a baseband signal and a control signal are transmitted between the radio base station apparatus and each radio transmission / reception unit. Since the signals are multiplexed by division and transmitted by digital signals that can be separated by the position of the synchronization code, there is no need to individually connect the wireless base station apparatus and each wireless transmitting / receiving unit, and the transmission rate can be used effectively. Therefore, the number of wirings can be reduced, the wiring distance can be shortened, and the installation work can be simplified. As a result, a system free from signal loss and restrictions on dynamic range can be supplied at low cost. Further, since the cell configuration can be changed according to the service mode without changing the hardware, it is possible to flexibly cope with the service mode at the base station installation location. It is also possible to transmit the same carrier to the mobile terminal device such as data communication in a time zone where the traffic volume of the broadcast distribution is large in each wireless transmission / reception unit.
[0102]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the change of the cell structure corresponding to an antenna according to a service form is hardened, ensuring the advantage of performing digital transmission of the signal transmission between a wireless base station apparatus and each antenna by an optical transmission line (optical fiber). This can be realized without any change, and the service form can be changed flexibly.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing one embodiment of a wireless base station system of the present invention.
FIG. 2 is a diagram illustrating a detailed block configuration example of the wireless base station device illustrated in FIG. 1;
FIG. 3 is a diagram illustrating a detailed block configuration example of a wireless transmission / reception unit illustrated in FIG. 1;
FIG. 4 is a diagram illustrating an example of a frame format of a transmission signal of an optical fiber.
FIG. 5 is a diagram illustrating a connection state of an optical switch unit in a normal state.
FIG. 6 is a diagram illustrating a connection state of an optical switch unit at the time of failure.
FIG. 7 is a diagram illustrating an example of a service mode (cell configuration) when a different carrier is allocated to each wireless transmission / reception unit.
FIG. 8 is a diagram illustrating an example of a service mode (cell configuration) when the same carrier is allocated to each wireless transmission / reception unit.
FIG. 9 is a diagram illustrating an example of a service mode (cell configuration) when a plurality of sets of the same plurality of carriers are allocated to each set of a plurality of wireless transmission / reception units.
[Explanation of symbols]
1 Transmission baseband signal processing unit
2 Control unit (CPU)
3 Composition section
4 Serializer section
5 Electric / optical converter
6 Optical / electrical conversion unit
7 Deserializer section
8 Retiming section
9 Separation unit
10 Reception baseband signal processing unit
11 Optical switch
12,26 Optical / electrical conversion unit
13,27 Deserializer
14,28 Retiming section
15, 18 Separation unit
16,29 Serializer section
17,30 Electric / optical converter
19 Control unit (CPU)
20 Transmission radio processing unit
22 Antenna
23 Reception wireless processing unit
24,25 synthesis unit
31, 32, 33, 34 switch
101 wireless base station device
102, 103, 104, 105 Wireless transceiver

Claims

A wireless base station device for controlling transmission and reception of a wireless signal to and from a mobile terminal device by an antenna provided at a remote location, and the wireless base station device each having the antenna and an optical transmission path for transmitting a digital signal And a plurality of wireless transmission / reception units that are sequentially connected in tandem and communicate with the wireless base station device of a wireless signal to be transmitted / received through the antenna.
As a signal transmitted and received on the optical transmission line, a synchronization code for synchronizing a frame, a plurality of baseband signals indicating amplitude data of a radio signal of each of a plurality of carriers, and control information for each of the radio transmission / reception units are shown. A control signal and a transmission multiplex signal and a reception multiplex signal obtained by time-division multiplexing in frame units,
The base station apparatus indicates an operation instruction and a carrier allocation instruction for each of the wireless transmission / reception units using a wireless transmission / reception unit identification number assigned to each of the wireless transmission / reception units and a carrier identification number assigned to each of the carriers. A control signal and a baseband signal corresponding to the transmission signal of each carrier are inserted into the transmission multiplexed signal to the optical transmission line, and a baseband signal corresponding to the reception signal of each carrier is transmitted from the optical transmission line. Means for extracting from the received multiplex signal of
Each of the wireless transceivers extracts the control signal addressed to itself from a transmission multiplexed signal from the optical transmission path based on the wireless transceiver identification number assigned to the wireless transceiver in advance, and is assigned to the wireless transceiver. The baseband signal, which is a transmission signal of the corresponding carrier, from the transmission multiplexed signal from the optical transmission path, based on the corresponding carrier identification number, and a received signal of the corresponding carrier. A radio base station system comprising means for inserting a baseband signal into a multiplex signal received by the optical transmission line.

A wireless base station device used in the wireless base station system according to claim 1,
An upper interface unit that controls an interface with the upper control device, a control unit that controls the entire wireless base station device, and a baseband signal processing unit that processes a transmission / reception signal with the mobile terminal device,
The baseband signal processing unit, a transmission baseband signal processing unit for generating a transmission baseband signal from transmission data to a mobile terminal device, and a reception control signal from the radio transmission / reception unit as inputs, A control unit that processes a setting response or a state monitoring response and generates a corresponding transmission control signal, and a transmission baseband signal output from the transmission baseband signal processing unit and a transmission control signal output from the control unit. Input and multiplexing means; a combined transmission multiplex signal as input; serializer means to convert parallel data into serial data; and a transmission multiplex signal converted into serial data as input, and an electric signal into an optical signal. An electrical / optical converter for converting and outputting the signal to the optical transmission line; and a receiving multiplexed signal received from the optical transmission line as an input; An optical / electrical converting means for converting to an electric signal, a receiving multiplex signal converted to an electric signal as input, a deserializer means for converting serial data to parallel data, and a receiving multiplex signal converted to parallel data as input, Retiming means for performing retiming; separating means for receiving a retimed reception multiplexed signal as input, separating a reception baseband signal and a reception control signal, and outputting the reception control signal to the control means; And a receiving baseband processing unit for receiving the received baseband signal separated in step (1) and restoring the received data from the mobile terminal device.

The receiving baseband signal processing means performs error correction decoding, framing, data demodulation, and despreading processing, and when amplitude data of a plurality of wireless transmission / reception units are synthesized and input, are synthesized from the least significant bit position. 3. The radio base station apparatus according to claim 2, wherein bits corresponding to the amplitude are deleted.

A wireless transmitting / receiving unit used in the wireless base station system according to claim 1,
First optical switch means for selecting whether to input a transmission multiplexed signal input from the wireless base station apparatus or the preceding wireless transmission / reception unit through the first optical transmission path into the own wireless transmission / reception unit, A first multiplexed signal output from the first optical switch means as an input, a first optical / electrical conversion means for converting an optical signal into an electric signal, and a transmission multiplexed signal converted into an electric signal as an input; A first deserializer for converting data into parallel data, a transmission multiplex signal converted to parallel data as input, a first retiming unit for performing retiming, and a retimed transmission multiplex signal as input, First separating means for separating a transmission baseband signal and a reception control signal, and one of the separated transmission multiplexed signals as input, and converting parallel data into serial data A first serializer for converting the input signal, a first electrical / optical converter for receiving the transmission multiplex signal converted to the serial data, converting the electrical signal to an optical signal, and outputting the optical signal; and the first electrical / optical converter. A second light for selectively outputting either the transmission multiplexed signal output from the means or the transmission multiplexed signal input from the first optical transmission line to a downstream wireless transmission / reception unit through the second optical transmission line. Switch means, the other of the transmission multiplexed signals demultiplexed by the first demultiplexing means as an input, a second demultiplexing means for demultiplexing into a transmission control signal and a transmission baseband signal, and a demultiplexed transmission control signal as an input A control unit for performing various settings and status requests, generating a reception control signal for various settings responses and status report responses, and a transmission baseband signal separated by the second separation unit as input, Transmission radio processing means for generating a signal, an antenna unit for receiving the transmission radio signal output from the transmission radio processing means as input, outputting the radio signal to the outside, and outputting the reception radio signal input as a radio signal from the outside Receiving radio signal output from the antenna unit, receiving radio processing means for generating a reception baseband signal, reception baseband signal output from the reception radio processing means, and output from the control means A first combining unit that receives a reception control signal and multiplexes the received multiplexed signal as a reception multiplexed signal; and inputs a reception multiplexed signal input from a downstream wireless transmission / reception unit through the second optical transmission line into the own wireless transmission / reception unit. A third optical switch for selecting whether or not the signal is received, and a received multiplexed signal output from the third optical switch, and an optical signal A second optical-to-electrical converter for converting an electric signal, a second deserializer for receiving a received multiplexed signal converted to an electric signal and converting serial data to parallel data, and a receiving device converted to parallel data A second retiming means for receiving a multiplexed signal and performing retiming, a received multiplexed signal output from the first synthesizing means and a received multiplexed signal output from the second retiming means. Second synthesizing means for multiplexing, a multiplexed reception multiplexed signal as input, a second serializer means for converting parallel data into serial data, and a reception multiplexed signal converted to serial data as input, A second electrical / optical converter for converting the optical signal into an optical signal, and outputting the received multiplexed signal and the second optical signal output from the second electrical / optical converter. And a fourth optical switch means for selectively outputting any one of the reception multiplexed signals inputted from the path to the radio base station apparatus or the preceding radio transmission / reception unit through the first optical transmission path. Wireless transmitting and receiving unit.

An optical switch unit is constituted only by the first to fourth optical switch units, and each optical switch unit of the optical switch unit is switched between a normal state and a failure. The wireless transmitting / receiving unit according to claim 4, wherein the wireless transmitting / receiving unit is connected to the wireless base station device and another wireless transmitting / receiving unit without passing through the transmitting / receiving unit.

5. The radio transmission / reception unit according to claim 4, wherein the first deserializer means synchronizes the frequency with the radio base station apparatus by using a clock extracted from the input serial data as a reference clock.

The first separation unit outputs the same data to both the first serializer unit and the second separation unit so that another wireless transmission / reception unit can extract the same data. The wireless transmission / reception unit according to claim 4, wherein

The second synthesizing unit matches the timing positions of the synchronization codes of the own radio transmission / reception unit and each of the other radio transmission / reception units, and recognizes and multiplexes the positions of a reception control signal and a reception baseband signal, and multiplexes the signals. Item 5. The wireless transmission / reception unit according to Item 4.

The wireless transmitting / receiving unit according to claim 4, wherein the second combining unit adds the amplitude of a received baseband signal in a cell configuration in which the same carrier is received by a plurality of wireless transmitting / receiving units.

10. The wireless transmission / reception unit according to claim 9, wherein the addition is performed at a point where the amplitudes of the respective wireless transmission / reception units are all at the same amplitude level.

A wireless base station device for controlling transmission and reception of a wireless signal to and from a mobile terminal device by an antenna provided at a remote location, and the wireless base station device each having the antenna and an optical transmission path for transmitting a digital signal A signal transmission control method of a remote antenna in a wireless base station system including a plurality of wireless transmitting and receiving units that communicates with the wireless base station apparatus of wireless signals transmitted and received through the antenna and are sequentially connected in tandem,
As a signal transmitted and received on the optical transmission line, a synchronization code for synchronizing a frame, a plurality of baseband signals indicating amplitude data of a radio signal of each of a plurality of carriers, and control information for each of the radio transmission / reception units are shown. A control signal and a transmission multiplex signal and a reception multiplex signal obtained by time-division multiplexing in frame units,
In the base station device, the operation instruction and the carrier assignment instruction for each of the wireless transmission and reception units using the wireless transmission and reception unit identification number assigned to each of the wireless transmission and reception units and the carrier identification number assigned to each of the carriers. A control signal and a baseband signal corresponding to the transmission signal of each carrier are inserted into a transmission multiplexed signal to the optical transmission line,
In each of the wireless transmitting and receiving units, the control signal addressed to the own device is extracted from the transmission multiplexed signal from the optical transmission line based on the wireless transmitting and receiving unit identification number pre-assigned to the own wireless transmitting and receiving unit and assigned to the own device. The baseband signal, which is a transmission signal of the corresponding carrier, from the transmission multiplexed signal from the optical transmission path, based on the corresponding carrier identification number, and a received signal of the corresponding carrier. Inserting a baseband signal into the received multiplex signal to the optical transmission line,
A remote antenna signal transmission control method, wherein the base station device extracts a baseband signal corresponding to a received signal of each carrier from a multiplexed signal received from the optical transmission line.