JP3709105B2

JP3709105B2 - Other channel communication quality estimation system using measurement channel and its communication quality estimation method

Info

Publication number: JP3709105B2
Application number: JP20990799A
Authority: JP
Inventors: 慎一森; 哲朗今井
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 1999-07-23
Filing date: 1999-07-23
Publication date: 2005-10-19
Anticipated expiration: 2019-07-23
Also published as: JP2001036462A

Description

【０００１】
【発明の属する技術分野】
本発明は、測定用チャンネルを用いた他チャンネル通信品質推定システムおよびその通信品質推定方法に関し、特にＣＤＭＡ（ＣｏｄｅＤｉｖｉｓｉｏｎＭｕｌｔｉｐｌｅＡｃｃｅｓｓ；符号分割多重アクセス）方式等の拡散信号を用いたセルラー移動通信システムにおけるサービスエリア内の通信品質を評価するシステムおよび方法に関する。
【０００２】
【従来の技術】
割り当てられた帯域を複数のチャンネルに分割し、夫々のチャンネルを用いて通信を行う従来型の移動通信システムにおいては、通信品質を決定する要因は受信電力の低下に伴う熱雑音と、空間的に同一および隣接チャネルを再使用することに起因する同一および隣接チャンネルの干渉雑音である。従って、サービスエリア内の通信品質を評価するには、現用に共されている基地局から送信されるチャンネルの受信電力を測定し、センターにおいてサービスエリア内の受信電力分布、およびＤＵ比（希望波受信電力対干渉波受信電力比）の分布を評価すればよい。
【０００３】
【発明が解決しようとする課題】
しかしながら、今後の移動通信方式として最有力視されているＣＤＭＡ方式におけるサービスエリア内の通信品質の評価は上述の従来方式のそれとは事態が異なっている。
【０００４】
まず、ＣＤＭＡ方式では割り当てられた帯域を複数の通信用帯域に再分割することなく、すべての通信で共有している。それぞれの通信は異なる符号を用いて行われており、使用する符号の種類によりチャンネルを区別している。したがって、通信品質を決定する要因の一つである干渉雑音は自地点に到来する自通信波以外の通信波によるものとなる。
【０００５】
また、ＣＤＭＡ方式では各通信チャンネルにおいて送信電力制御が必須であり、送信電力はトラヒック量に応じて変動する。例えば、トラヒック量が増えれば、干渉雑音が増加することとなり、送信側は受信側の品質が規定値を満たすように、自分の能力の範囲内で送信電力を増加させる。
【０００６】
また、ＣＤＭＡ方式では各サービス毎に送信条件（送信電力、伝送レート、チップレート、等）の異なるチャンネルが割り当てられるため、通信品質は各サービス毎に異なる。
【０００７】
このように、ＣＤＭＡ方式においては、通信品質の評価を行うとすると、各サービス、各チャンネル毎にトラヒックの時間変動を考慮しつつ、実測を行う必要があり、非効率である。
【０００８】
本発明は、上述の点に鑑みてなされたもので、その目的は、ＣＤＭＡ方式等の拡散信号を用いた移動通信方式のサービスエリア内において、特定の測定用チャンネルを用いて測定を行うことで、効率よく他チャンネルの通信品質を評価できるようにすることにある。
【０００９】
【課題を解決するための手段】
上記目的を達成するため、請求項１の発明は、ＣＤＭＡ等の拡散信号を用いた移動通信システムのサービスエリア内において所定の測定コースを走行しながら無線基地局から送信される特定の測定用チャンネルを用いて該サービスエリア内の受信電力、干渉電力、パスプロファイルを少なくとも含む受信特性を実測する移動測定手段と、該移動測定手段で得られた実測データと通信品質を推定するための所定の演算式を用いて送信電力、伝送レート、チップレートのいずれかを少なくとも含む送信条件が前記測定用チャンネルと異なる他チャンネルのＳＩＲ（受信電力対干渉電力比），ＢＥＲ（ビット誤り率）のいずれかを少なくとも含む通信品質を推定する通信品質推定手段とを有することを特徴とする。
【００１０】
ここで、前記移動測定手段は前記測定用チャンネルの受信特性および下り干渉電力を測定し、前記通信品質推定手段は該移動測定手段で取得した該受信特性および該下り干渉電力の実測データを用いて送信条件が前記測定用チャンネルと異なる下りチャンネルの通信品質を推定することを特徴とすることができる。
【００１１】
また、前記通信品質推定手段は、前記移動測定手段で取得した前記測定用チャンネルの受信特性と前記サービスエリア内の各無線基地局で測定した上り干渉総電力の実測データを用いて送信条件が前記測定用チャンネルと異なる上りチャンネルの通信品質を推定することを特徴とすることができる。
【００１２】
また、前記通信品質推定手段は、前記移動測定手段で取得した前記測定用チャンネルの受信特性と下り干渉電力、前記サービスエリア内の各無線基地局で測定した上り干渉総電力の実測データに加えて、基地局データ、トラヒックデータ、地形・建物データの各データベースを用いて前記測定コース外の受信特性を推定し、該推定結果を用いて前記測定用チャンネルと異なる他チャンネルの通信品質を推定することを特徴とすることができる。
【００１３】
また、前記通信品質推定手段は、前記測定コース上では前記実測データ、その他の地点では各種前記データベースと前記演算式から計算した推定データを用いて、前記測定コースの内外、トラヒック分布の形状を問わず前記サービスエリア全体における各前記他チャンネルについて通信品質を推定することを特徴とすることができる。
【００１４】
また、前記通信品質推定手段は、前記実測データから前記測定用チャンネルの通信品質の評価を行い、該評価結果と前記基地局データを用いて、前記測定コース上の前記他チャンネルの通信品質を推定し、前記評価結果と前記基地局データおよび前記トラヒックデータ、前記地形・建物データを用いてあるトラヒック分布を仮定したときの前記サービスエリア全体における各前記他チャンネルの通信品質を推定することを特徴とすることができる。
【００１５】
また、前記実測データは前記測定用チャンネルについての受信電力、下り干渉電力、パスプロファイル、上り干渉総電力、測定用チャンネル送信電力を含み、前記基地局データは各基地局の位置、アンテナ指向性、送信電力、送信レート、チップレートのいずれかを少なくとも含み、トラヒックデータは実測トラヒック、推定トラヒックを含み、前記地形・建物データは標高、土地利用、建物高のいずれかを少なくとも含み、前記他チャンネル推定データはパスプロファイル推定データ、下り受信電力推定データ、上り受信電力推定データ、下り干渉電力推定データ、上り干渉電力推定データを含み、前記通信品質はＳＩＲ，所要送信電力、ＢＥＲを含むことを特徴とすることができる。
【００１６】
また、前記通信品質推定手段は、前記測定コース内の他チャンネル下りＳＩＲの推定に際し、前記実測データの下り干渉電力、前記基地局データの送信条件である測定用チャンネル伝送レート、他チャンネル伝送レートを用いて他チャンネル下り干渉電力を算出し、前記実測データのパスプロファイルと前記基地局データの送信条件である測定用チャンネル送信電力、他チャンネル下り送信電力を用いて他チャンネル下りパスプロファイルを算出し、該他チャンネル下りパスプロファイルを総計することで他チャンネル下り受信電力を得、前記他チャンネル下り干渉電力と前記他チャンネル下り受信電力の比をとることで他チャンネル下りＳＩＲを推定することを特徴とすることができる。
【００１７】
また、前記通信品質推定手段は、前記測定コース内の他チャンネル上りＳＩＲの推定に際し、前記実測データの上り干渉総電力、前記基地局データの送信条件であるチップレート、他チャンネル伝送レートを用いて他チャンネル上り干渉電力を算出し、前記実測データのパスプロファイルと前記基地局データの送信条件である測定用チャンネル送信電力、他チャンネル上り送信電力を用いて他チャンネル上りパスプロファイルを算出し、該他チャンネル上りパスプロファイルを総計することで他チャンネル上り受信電力を得、前記他チャンネル上り干渉電力と前記他チャンネル上り受信電力の比をとることで他チャンネル上りＳＩＲを推定することを特徴とすることができる。
【００１８】
また、前記通信品質推定手段は、全サービスエリアにおける他チャンネル下りＳＩＲの推定に際し、下りチャンネル毎に送信電力を設定し、該設定した送信電力と前記基地局データ、前記地形・建物データを用いて前記測定コース外の推定パスプロファイルを得、また、該設定した送信電力と前記実測データのパスプロファイルと前記基地局データの送信条件である測定用チャンネルの送信電力を用いて前記測定コース内の推定パスプロファイルを得、該測定コース外の推定パスプロファイルと該測定コース内の推定パスプロファイルとから任意の地点のパスプロファイルを得、任意の地点の推定パスプロファイルの総和から各チャンネル下り受信電力を得、該下り受信電力の総和と前記基地局データの送信条件であるチップレート、他チャンネル伝送レートを用いて各チャンネル下り干渉電力を算出し、該各チャンネル下り干渉電力と前記各チャンネル下り受信電力の比をとることで各チャンネル下りＳＩＲを推定することを特徴とすることができる。
【００１９】
また、前記通信品質推定手段は、全サービスエリアにおける他チャンネル上りＳＩＲの推定に際し、上りチャンネル毎に送信電力を設定し、該設定した送信電力と前記基地局データ、前記地形・建物データを用いて前記測定コース外の推定パスプロファイルを得、また、該設定した送信電力と前記実測データのパスプロファイルと前記基地局データの送信条件である測定用チャンネルの送信電力を用いて前記測定コース内の推定パスプロファイルを得、該測定コース外の推定パスプロファイルと該測定コース内の推定パスプロファイルとから任意の地点のパスプロファイルを得、任意の地点の推定パスプロファイルの総和から各チャンネル上り受信電力を得、前記上り受信電力の総和と前記基地局データの送信条件であるチップレート、他チャンネル伝送レートを用いて各チャンネル上り干渉電力を算出し、該各チャンネル上り干渉電力と前記各チャンネル上り受信電力の比をとることで各チャンネル上りＳＩＲを推定することを特徴とすることができる。
【００２０】
また、前記通信品質推定手段は、各チャンネルにおける所要送信電力を推定するに際し、チャンネル毎に所要ＳＩＲ値を設定し、チャンネル毎に送信電力の初期値を設定し、全サービスエリアにおける他チャンネル品質推定を行った後、チャンネル毎に全チャンネルのＳＩＲが前記所要ＳＩＲ値を満たすか否かを判定し、これが肯定判定となるまでチャンネル毎に送信電力を更新することで各チャンネルにおける所要送信電力を推定することを特徴とすることができる。
【００２１】
また、前記通信品質推定手段は、各チャンネルのＳＩＲ、各チャンネルのパスプロファイルおよび前記基地局データの送信条件を用いて各チャンネルにおけるＢＥＲを算出することを特徴とすることができる。
【００２２】
上記目的を達成するため、請求項１４の発明は、ＣＤＭＡ等の拡散信号を用いた移動通信システムのサービスエリア内において所定の測定コースを走行しながら無線基地局から送信される特定の測定用チャンネルを用いて該サービスエリア内の受信電力、干渉電力、パスプロファイルを少なくとも含む受信特性を実測する移動測定ステップと、該移動測定ステップで得られた実測データと通信品質を推定するための所定の演算式を用いて送信電力、伝送レート、チップレートのいずれかを少なくとも含む送信条件が前記測定用チャンネルと異なる他チャンネルのＳＩＲ（受信電力対干渉電力比），ＢＥＲ（ビット誤り率）のいずれかを少なくとも含む通信品質を推定する通信品質推定ステップとを有することを特徴とする。
【００２３】
（作用）
本発明では、上記構成により、ＣＤＭＡ方式等の拡散信号を用いた移動通信方式のサービスエリア内において、無線基地局から送信される特定の測定用チャンネルの移動測定車における受信特性と下り干渉電力、各基地局で測定した上り干渉総電力データとを用いて、測定用チャンネルの通信品質評価を行う。この通信品質評価結果に対し、送信特性により違いを考慮して、他チャネルの通信評価を行う。
【００２４】
このように、本発明では、測定用チャンネルを実測して得た実測データや、各基地局で測定した上り干渉総電力を用いて他チャンネルの通信品質を推定するので、実測するチャンネルは測定用チャンネル一つのみで、他チャンネルについても測定コース上における通信品質評価が可能となる。また、シミュレーションを行うことで、任意のトラヒック等の条件下においても、全サービスエリアについて各チャンネルの通信品質推定を行うことができることから、測定用チャンネルのみの測定、記録および蓄積を行えばよく、さらにチャンネル毎の走行測定の必要もなくなることから、効率的で経済的な通信品質評価が可能となる。
【００２５】
【発明の実施の形態】
以下、図面を参照して本発明の実施形態を詳細に説明する。
【００２６】
図１は、本発明の一実施形態における測定用チャンネルを用いた他チャンネル通信品質測定システムの概念的構成を示す。本測定システムは、所定の測定コース上の測定用チャンネルを移動測定車に搭載した装置により実測し、この実測値をもとに測定コース内の他チャンネル品質測定と全サービスエリアにおける他チャンネル品質推定を行う。
【００２７】
図１に示すように、所定の測定コース１を走行する移動測定車２の測定機器（図示しない）において、基地局３から送信される特定の片方向チャンネルを測定用チャンネル４として実測し、取得したデータを実測データ５として記録媒体上に記録する。これらの実測データ５をセンタに持ち帰り、センタ内の実測データベース６に蓄積する。この実測データベース６を初めとして、他のシステムにより作成される基地局データベース７、トラヒックデータベース８、地形・建物データベース９の各データベースを用いて、コンピュータユニット（センタ側品質推定装置）１０により“測定コース内の他チャンネル品質推定”と“全サービスエリアにおける他チャンネル品質推定”を行う。
【００２８】
図２は図１の機能を達成するのに用いられるハードウエアの構成例を示す。ここで、２１は基地局３から送信される測定用チャンネル４を受信する移動測定車搭載の受信機、２２は受信機２１の受信信号から所望の実測データ５を得る移動測定車搭載の計測装置であり、実測データ５は記憶装置２３を介して記憶媒体２４に記録される。
【００２９】
センタに持ち帰られた記憶媒体２４の実測データ５は、センタ内のドライバ２５を介して読取られ、センタ側品質推定装置（コンピュータユニット）１０を通じて実測データベース６に蓄積される。２６は実測データベース６を初めとして、基地局データベース７、トラヒックデータベース８、地形・建物データベース９の各データベースを格納するＤＲＡＭ等の記憶装置である。２７は上記“測定コース内の他チャンネル品質推定”と“全サービスエリアにおける他チャンネル品質推定”を行うための演算処理手順を記録したＲＯＭ等の記憶装置である。２８、２９は品質推定結果を出力するためのモニタとプリンタである。
【００３０】
図３の（Ａ）は測定コース１内の他チャンネル品質推定の概念を示している。基地局３から送信される片方向の測定用チャンネル４を移動測定車２にて測定した結果が実測データである。本発明の推定では、この実測データ５から、送信電力や伝送レートが異なる他チャンネル３１で同じ測定コース１上において通信を行った場合の通信品質を推定する。図３の（Ｂ）に、使用するデータの種類と、推定により得ることのできる結果データの関係を示している。
【００３１】
すなわち、実測データ５としては、受信電力、下り干渉電力、パスプロファイル、上り干渉総電力、測定チャネル送信電力がある。この実測データ５と基地局データベース７から得られる基地局データ推定条件とを用いて他チャンネル推定データを各地点のデータ毎に算出する。基地局データ推定条件としては、送信電力、伝送レート、チップレートがある。他チャンネル推定データとしては、パスプロファイル、下り受信電力、下り干渉電力、上り受信電力、上り干渉電力がある。この他チャンネル推定データから測定コース内の他チャンネル品質推定を行うが、この他チャンネル品質推定には、下りＳＩＲ、下り所要送信電力、下りＢＥＲ（ビット誤り率）、上りＳＩＲ、上り所要送信電力、上りＢＥＲがある。
【００３２】
図４の（Ａ）は全サービスエリアにおける他チャンネル品質推定の概念を示している。推定エリア内で実測を行ったコースに相当する場所には、実測データのパスプロファイルを割り当て、それ以外の場所については、後述の推定式に基地局、地形・建物の各データを適用することで推定したパスプロファイルを割り当てる。これらのパスプロファイルは、図４の（Ｂ）に示すように、各チャンネル毎にその送信電力を考慮したものを割り当てている。本発明の推定では、サービスエリア内にトラヒックデータにより与えられるトラヒックが存在するときに、各通信チャンネルが実測または推定により得られたパスプロファイルで通信を行った場合の通信品質を推定する。図４の（Ｂ）には、使用するデータの種類と、推定により得ることのできるデータの関係を示している。トラフィックデータには実測トラフィックと推定トラフィックがあるが、図１のトラフィックデータベース８から得られる。
【００３３】
図５は測定コース１内の他チャンネル品質推定と全サービスエリアにおける他チャンネル品質推定を行う際のデータの流れをまとめて示す。
【００３４】
次に、演算式を用いて、本発明の他チャンネル品質推定の処理内容をさらに詳細に説明する。
【００３５】
測定コースの他チャンネル品質推定（下りＳＩＲ）の手順を図６に示す。
【００３６】
【外１】

【００３７】
【数１】

【００３８】
で求められる（ステップ６１）。
【００３９】
【外２】

【００４０】
【数２】

【００４１】
で与えられる（ステップ６２）。
【００４２】
【外３】

【００４３】
【数３】

【００４４】
で与えられる（ステップ６３）。
【００４５】
【外４】

【００４６】
【数４】

【００４７】
で求められる（ステップ６４）。
【００４８】
測定コースの他チャンネル品質推定（上りＳＩＲ）の手順を図７に示す。
【００４９】
【外５】

【００５０】
【数５】

【００５１】
で示すことができる（ステップ７１）。
【００５２】
【外６】

【００５３】
【数６】

【００５４】
で与えられる（ステップ７２）。
【００５５】
【外７】

【００５６】
【数７】

【００５７】
である（ステップ７３）。
【００５８】
【外８】

【００５９】
【数８】

【００６０】
となる（ステップ７４）。
【００６１】
次に、測定コースの内外を問わず、サービスエリア全域において、実測データから他チャンネルの通信品質の推定を行う方法について述べる。特に、ここでは、測定コース内においては実測データのパスプロファイルを用い、また測定コース外では以下に述べる推定式によるパスプロファイルを用いて、通信品質を推定する方法について説明する。
【００６２】
全サービスエリアにおける他チャンネル品質推定（下りＳＩＲ）の手順を図８に示す。
【００６３】
【外９】

【００６４】
【数９】

【００６５】
【外１０】

【００６６】
【数１０】

【００６７】
【外１１】

【００６８】
【数１１】

【００６９】
で与えられる（ステップ８４）。
【００７０】
【外１２】

【００７１】
【数１２】

【００７２】
として求められる（ステップ８５）。
【００７３】
全サービスエリアにおける他チャンネル品質推定（上りＳＩＲ）の手順を図９に示す。
【００７４】
【外１３】

【００７５】
【数１３】

【００７６】
【外１４】

【００７７】
【数１４】

【００７８】
を得る（ステップ９３）。
【００７９】
【外１５】

【００８０】
【数１５】

【００８１】
で与えられる（ステップ９４）。
【００８２】
【外１６】

【００８３】
【数１６】

【００８４】
で得ることができる（ステップ９５）。
【００８５】
上述の図８および図９では、各チャンネル毎に送信電力を設定した際の通信品質（ＳＩＲ）の計算方法を示した。これとは逆に、所望の通信品質（ＳＩＲ）を設定し、その時の所要送信電力を求める場合には、図１０に示すアルゴリズムを用いた繰返し演算を行えばよい。
【００８６】
これを説明すると、まず、各チャンネル毎に所要（所望）のＳＩＲ値を設定する（ステップ１０１）。
次に、各チャネル毎に送信電力の初期値を設定する（ステップ１０２）。
【００８７】
続いて、全サービスエリアにおける他チャンネル品質推定（上り）、または全サービスエリアにおける他チャンネル品質推定（下り）を行う（ステップ１０３）。次に、各チャンネル毎にＳＩＲを判定し、全チャンネルのＳＩＲが所要値を満たすか否かを判定し（ステップ１０４）、満たさない場合は各チャンネル毎に送信電力を更新して（ステップ１０５）、ステップ１０３に戻り、ステップ１０４が肯定判定となるまで、この送信電力の更新処理を繰り返す。
【００８８】
全チャンネルのＳＩＲが所要値を満たした場合は、各チャンネルの所要送信電力が求まる（ステップ１０６）。
【００８９】
【外１７】

【００９０】
（他の実施の形態）
なお、本発明の目的は、前述した実施の形態の機能を実現するソフトウエアのプログラムコードを記録した記録媒体（記憶媒体）を、システムあるいは装置に供給し、そのシステムあるいは装置のコンピュータ（またはＣＰＵやＭＰＵ）が記録媒体に格納されたプログラムコードを読み出し、実行することによっても、達成されることは言うまでもない。この場合、記録媒体から読み出されたプログラムコード自体が前述した実施の形態の機能を実現することになり、そのプログラムコードを記録した記録媒体は本発明を構成することになる。そのプログラムコードを記録し、またテーブル等の変数データを記録する記録媒体としては、例えばフロッピディスク、ハードディスク、光ディスク、ＩＣ−ＲＯＭなどを用いことができる。
【００９１】
【発明の効果】
以上説明したように、本発明によれば、測定用チャンネルの各種実測結果を用いて他チャンネルの通信品質を推定するようにしたので、実測するチャンネルは無線エリア構成単位毎に一つのみで、任意の地点、トラヒック分布、チャンネル種別について、実測しない他の通信チャンネルの通信品質評価をセンタにおいて行うことが可能となる。従って、サービスエリア評価に要する労力を大幅に削減できる。
【００９２】
また、本発明によれば、その実測結果をエリア全体の評価に反映させることで、全ての種類のサービスについて高精度なエリア評価が可能となる。
【００９３】
さらに、本発明によれば、測定用システムは測定用チャンネルのみの測定、記録、蓄積を行えばよく、また、チャンネル毎の走行測定の必要もなくなることから、サービスエリアの実測評価の効率と経済性を飛躍的に向上させることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態における測定用チャンネルを用いた他チャンネル通信品質測定システムの構成を示す概念図である。
【図２】図１の機能を達成するのに用いられるハードウエアの構成例を示すブロック図である。
【図３】本発明の一実施形態における測定コース内の他チャンネル品質推定の概念を示す説明図である。
【図４】本発明の一実施形態の全サービスエリアにおける他チャンネル品質推定の概念を示す説明図である。
【図５】本発明の一実施形態の測定コース内の他チャンネル品質推定と全サービスエリアにおける他チャンネル品質推定を行う際のデータの流れとデータの相互関係をまとめて示すブロック図である。
【図６】本発明の一実施形態における測定コース内の他チャンネル品質推定（下りＳＩＲ）の演算処理手順を示すフローチャートである。
【図７】本発明の一実施形態における測定コース内の他チャンネル品質推定（上りＳＩＲ）の演算処理手順を示すフローチャートである。
【図８】本発明の一実施形態の全サービスエリアにおける他チャンネル品質推定（下りＳＩＲ）の演算処理手順を示すフローチャートである。
【図９】本発明の一実施形態の全サービスエリアにおける他チャンネル品質推定（上りＳＩＲ）の演算処理手順を示すフローチャートである。
【図１０】本発明の一実施形態の各チャンネルにおける所要送信電力を求める処理手順を示すフローチャートである。
【図１１】本発明の一実施形態の各チャンネルにおけるＢＥＲを求める方法を示すブロック図である。
【符号の説明】
１測定コース
２移動測定車
３基地局
４測定用チャンネル
５実測データ
６実測データベース
７基地局データベース
８トラヒックデータベース
９地形・建物データベース
１０センタ側品質推定装置（コンピュータユニット）
２１移動測定車側受信機
２２計測装置
２３記憶装置
２４記憶媒体
２５ドライバ
２６各種データデータベース格納用ＤＲＡＭ等の記憶装置
２７プログラム格納用ＲＯＭ等の記憶装置
２８モニタ
２９プリンタ
３１他チャンネル
３２上り、下りの通信品質
５１測定コース内の他チャンネル品質推定ブロック
５２全サービスエリアにおける他チャンネル品質推定ブロック
５６実測データ
５７基地局データ
５８トラヒックデータ
５９地形・建物データ
１１１ＢＥＲ推定モジュール（シミュレーションプログラム）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to another channel communication quality estimation system using a measurement channel and a communication quality estimation method thereof, and more particularly to a cellular mobile communication system using a spread signal such as a CDMA (Code Division Multiple Access) system. The present invention relates to a system and method for evaluating communication quality in a service area.
[0002]
[Prior art]
In a conventional mobile communication system that divides the allocated band into a plurality of channels and performs communication using each channel, the factors that determine the communication quality are the thermal noise accompanying the decrease in received power, and the spatial Interference noise of the same and adjacent channels due to reuse of the same and adjacent channels. Therefore, in order to evaluate the communication quality in the service area, the received power of the channel transmitted from the base station shared with the current service is measured, and the received power distribution in the service area and the DU ratio (desired signal) at the center. The distribution of received power to interference wave received power ratio) may be evaluated.
[0003]
[Problems to be solved by the invention]
However, the evaluation of the communication quality in the service area in the CDMA system, which is regarded as the most promising mobile communication system in the future, is different from that in the conventional system described above.
[0004]
First, in the CDMA system, the allocated band is shared by all communications without being subdivided into a plurality of communication bands. Each communication is performed using different codes, and the channels are distinguished by the type of codes used. Therefore, interference noise, which is one of the factors that determine communication quality, is caused by communication waves other than the own communication wave arriving at the local point.
[0005]
In the CDMA system, transmission power control is essential in each communication channel, and the transmission power varies according to the traffic volume. For example, if the amount of traffic increases, interference noise increases, and the transmission side increases the transmission power within the range of its own ability so that the quality on the reception side satisfies a specified value.
[0006]
In the CDMA system, channels having different transmission conditions (transmission power, transmission rate, chip rate, etc.) are assigned for each service, so that the communication quality differs for each service.
[0007]
As described above, in the CDMA system, if the communication quality is evaluated, it is necessary to perform the actual measurement in consideration of the traffic time variation for each service and each channel, which is inefficient.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to perform measurement using a specific measurement channel in a mobile communication system service area using a spread signal such as a CDMA system. In other words, the communication quality of other channels can be evaluated efficiently.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is a specific measurement channel transmitted from a radio base station while traveling on a predetermined measurement course in a service area of a mobile communication system using a spread signal such as CDMA. Mobile measurement means for actually measuring reception characteristics including at least received power, interference power, and path profile in the service area, and predetermined calculation for estimating measured data and communication quality obtained by the mobile measurement means Using a formula, one of SIR (reception power to interference power ratio) and BER (bit error rate) of another channel whose transmission condition including at least one of transmission power, transmission rate, and chip rate is different from the measurement channel. Communication quality estimating means for estimating communication quality including at least the communication quality.
[0010]
Here, the mobile measurement means measures reception characteristics and downlink interference power of the measurement channel, and the communication quality estimation means uses the reception characteristics and measured data of the downlink interference power acquired by the movement measurement means. The communication quality of a downlink channel whose transmission condition is different from that of the measurement channel can be estimated.
[0011]
Further, the communication quality estimation means uses the reception characteristics of the measurement channel acquired by the mobile measurement means and the measured data of uplink interference total power measured at each radio base station in the service area, so that the transmission condition is The communication quality of the uplink channel different from the measurement channel can be estimated.
[0012]
Further, the communication quality estimation means includes, in addition to the measured data of the reception characteristics and downlink interference power of the measurement channel acquired by the mobile measurement means, and the uplink interference total power measured at each radio base station in the service area. , Estimating reception characteristics outside the measurement course using base station data, traffic data, and terrain / building data databases, and estimating communication quality of other channels different from the measurement channel using the estimation results Can be characterized.
[0013]
In addition, the communication quality estimation means uses the actual measurement data on the measurement course and the estimation data calculated from the various databases and the calculation formulas at other points to determine the shape of the traffic distribution inside and outside the measurement course. First, it is possible to estimate communication quality for each of the other channels in the entire service area.
[0014]
Further, the communication quality estimation means evaluates the communication quality of the measurement channel from the actual measurement data, and estimates the communication quality of the other channel on the measurement course using the evaluation result and the base station data. And estimating the communication quality of each of the other channels in the entire service area when a traffic distribution is assumed using the evaluation result, the base station data, the traffic data, and the terrain / building data. can do.
[0015]
The actual measurement data includes received power, downlink interference power, path profile, total uplink interference power, and measurement channel transmission power for the measurement channel, and the base station data includes the position of each base station, antenna directivity, At least one of transmission power, transmission rate, and chip rate, traffic data includes measured traffic and estimated traffic, and the terrain / building data includes at least one of altitude, land use, and building height, and the other channel estimation The data includes path profile estimation data, downlink reception power estimation data, uplink reception power estimation data, downlink interference power estimation data, and uplink interference power estimation data, and the communication quality includes SIR, required transmission power, and BER. can do.
[0016]
Further, the communication quality estimating means, when estimating the downlink SIR of another channel in the measurement course, calculates the downlink interference power of the measured data, the measurement channel transmission rate and the other channel transmission rate which are the transmission conditions of the base station data. Calculate other channel downlink interference power using the measured data path profile and the measurement channel transmission power that is the transmission condition of the base station data, calculate the other channel downlink path profile using the other channel downlink transmission power, The other channel downlink path profile is obtained by summing the other channel downlink path profile, and the other channel downlink SIR is estimated by taking the ratio of the other channel downlink interference power and the other channel downlink received power. be able to.
[0017]
Further, the communication quality estimation means uses the total uplink interference power of the actually measured data, the chip rate as the transmission condition of the base station data, and the other channel transmission rate when estimating the other channel uplink SIR in the measurement course. The other channel uplink interference power is calculated, the other channel uplink path profile is calculated using the measured data path profile, the measurement channel transmission power which is the transmission condition of the base station data, and the other channel uplink transmission power. The other channel uplink received power is obtained by totaling the channel uplink path profile, and the other channel uplink SIR is estimated by taking the ratio of the other channel uplink interference power and the other channel uplink received power. it can.
[0018]
Further, the communication quality estimation means sets transmission power for each downlink channel when estimating the downlink SIR of other channels in all service areas, and uses the set transmission power, the base station data, and the terrain / building data. An estimated path profile outside the measurement course is obtained, and estimation within the measurement course is performed using the set transmission power, the path profile of the measured data, and the transmission power of the measurement channel which is the transmission condition of the base station data. A path profile is obtained, a path profile at an arbitrary point is obtained from an estimated path profile outside the measurement course and an estimated path profile within the measurement course, and each channel's downlink received power is obtained from the sum of the estimated path profiles at any point. , The sum of the downlink received power, the chip rate as the transmission condition of the base station data, Calculating each channel downlink interference power using the channel transmission rate, it can be characterized by estimating each channel downlink SIR by taking the ratio of the the respective channel downlink interference power per channel downlink received power.
[0019]
Further, the communication quality estimation means sets transmission power for each uplink channel when estimating the uplink SIR of other channels in all service areas, and uses the set transmission power, the base station data, and the terrain / building data. An estimated path profile outside the measurement course is obtained, and estimation within the measurement course is performed using the set transmission power, the path profile of the measured data, and the transmission power of the measurement channel which is the transmission condition of the base station data. Obtain a path profile, obtain a path profile at an arbitrary point from the estimated path profile outside the measurement course and an estimated path profile within the measurement course, and obtain the uplink received power for each channel from the sum of the estimated path profiles at any point. , The sum of the uplink received power, the chip rate that is the transmission condition of the base station data, Calculating each channel uplink interference power using the tunnel transmission rate, it can be characterized by estimating each channel uplink SIR by taking the ratio of the respective channel uplink interference power and said each channel uplink received power.
[0020]
Further, the communication quality estimating means, when estimating the required transmission power in each channel, set the required SIR value for each channel, sets the initial value of the transmission power for each channel, the other channel quality estimation in all service areas after, it is determined whether the SIR of all channels meet the required SIR value for each channel, which estimates the required transmission power in each channel by updating the transmission power for each channel until affirmative It can be characterized by.
[0021]
Further, the communication quality estimation means may calculate the BER in each channel using the SIR of each channel, the path profile of each channel, and the transmission condition of the base station data.
[0022]
In order to achieve the above object, the invention of claim 14 is a specific measurement channel transmitted from a radio base station while traveling on a predetermined measurement course in a service area of a mobile communication system using a spread signal such as CDMA. A mobile measurement step for actually measuring reception characteristics including at least the received power, interference power, and path profile in the service area, and a predetermined calculation for estimating the measured data and communication quality obtained in the mobile measurement step. Using a formula, one of SIR (reception power to interference power ratio) and BER (bit error rate) of another channel whose transmission condition including at least one of transmission power, transmission rate, and chip rate is different from the measurement channel. A communication quality estimation step for estimating communication quality including at least the communication quality.
[0023]
(Function)
In the present invention, with the above configuration, within the mobile communication system service area using a spread signal such as the CDMA system, reception characteristics and downlink interference power in a mobile measurement vehicle of a specific measurement channel transmitted from a radio base station, The communication quality of the measurement channel is evaluated using the total uplink interference power data measured at each base station. For this communication quality evaluation result, communication evaluation of other channels is performed in consideration of differences depending on transmission characteristics.
[0024]
In this way, in the present invention, since the communication quality of other channels is estimated using actual measurement data obtained by actually measuring the measurement channel and the total uplink interference power measured at each base station, the actually measured channel is used for measurement. Communication quality evaluation on the measurement course is possible for only one channel and other channels. In addition, by performing simulation, it is possible to estimate the communication quality of each channel for all service areas even under conditions of arbitrary traffic, etc., so it is only necessary to measure, record and accumulate only the measurement channel, Furthermore, since there is no need to measure travel for each channel, it is possible to evaluate communication quality efficiently and economically.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0026]
FIG. 1 shows a conceptual configuration of another channel communication quality measurement system using a measurement channel in one embodiment of the present invention. In this measurement system, measurement channels on a predetermined measurement course are measured by a device mounted on a mobile measurement vehicle, and other channel quality measurements in the measurement course and other channel quality estimations in all service areas are performed based on the measured values. I do.
[0027]
As shown in FIG. 1, a measurement device (not shown) of a mobile measurement vehicle 2 traveling on a predetermined measurement course 1 measures and acquires a specific one-way channel transmitted from the base station 3 as a measurement channel 4. The recorded data is recorded as a measured data 5 on a recording medium. These measured data 5 are taken back to the center and stored in the measured database 6 in the center. Using this actual measurement database 6, a base station database 7, a traffic database 8, and a terrain / building database 9 created by another system, a computer unit (center-side quality estimation device) 10 performs a “measurement course”. "Other channel quality estimation" and "Other channel quality estimation in all service areas".
[0028]
FIG. 2 shows an example of the hardware configuration used to achieve the functions of FIG. Here, 21 is a receiver mounted on a mobile measurement vehicle that receives the measurement channel 4 transmitted from the base station 3, and 22 is a measurement device mounted on the mobile measurement vehicle that obtains desired actual measurement data 5 from the received signal of the receiver 21. The actual measurement data 5 is recorded in the storage medium 24 via the storage device 23.
[0029]
The actual measurement data 5 of the storage medium 24 brought back to the center is read through the driver 25 in the center and accumulated in the actual measurement database 6 through the center-side quality estimation device (computer unit) 10. Reference numeral 26 denotes a storage device such as a DRAM which stores the base station database 7, the traffic database 8, and the terrain / building database 9 as well as the actual measurement database 6. Reference numeral 27 denotes a storage device such as a ROM in which calculation processing procedures for performing the above-described “estimation of other channel quality in the measurement course” and “estimation of other channel quality in all service areas” are recorded.

Reference numerals

28 and 29 denote a monitor and a printer for outputting a quality estimation result.
[0030]
FIG. 3A shows the concept of other channel quality estimation in the measurement course 1. The result of measuring the one-way measurement channel 4 transmitted from the base station 3 with the mobile measurement vehicle 2 is the actual measurement data. In the estimation of the present invention, the communication quality when communication is performed on the same measurement course 1 in the other channel 31 having different transmission power and transmission rate is estimated from the actual measurement data 5. FIG. 3B shows the relationship between the type of data to be used and the result data that can be obtained by estimation.
[0031]
That is, the measured data 5 includes received power, downlink interference power, path profile, total uplink interference power, and measurement channel transmission power. Using this measured data 5 and the base station data estimation condition obtained from the base station database 7, other channel estimation data is calculated for each point of data. Base station data estimation conditions include transmission power, transmission rate, and chip rate. Other channel estimation data includes a path profile, downlink reception power, downlink interference power, uplink reception power, and uplink interference power. The other channel quality estimation in the measurement course is performed from the other channel estimation data. The other channel quality estimation includes downlink SIR, downlink required transmission power, downlink BER (bit error rate), uplink SIR, uplink required transmission power, There is an upstream BER.
[0032]
FIG. 4A shows the concept of other channel quality estimation in all service areas. Assign the path profile of the measured data to the place corresponding to the course that was actually measured in the estimated area, and apply the base station, terrain and building data to the estimation formula described later for other places. Assign the estimated path profile. As shown in FIG. 4B, these path profiles are assigned for each channel in consideration of the transmission power. In the estimation of the present invention, when there is traffic given by traffic data in the service area, the communication quality when each communication channel performs communication with the path profile obtained by actual measurement or estimation is estimated. FIG. 4B shows the relationship between the type of data to be used and data that can be obtained by estimation. The traffic data includes measured traffic and estimated traffic, which are obtained from the traffic database 8 of FIG.
[0033]
FIG. 5 collectively shows the flow of data when performing other channel quality estimation in the measurement course 1 and other channel quality estimation in all service areas.
[0034]
Next, the processing contents of other channel quality estimation according to the present invention will be described in more detail using arithmetic expressions.
[0035]
FIG. 6 shows the procedure of other channel quality estimation (downlink SIR) in the measurement course.
[0036]
[Outside 1]

[0037]
[Expression 1]

[0038]
(Step 61).
[0039]
[Outside 2]

[0040]
[Expression 2]

[0041]
(Step 62).
[0042]
[Outside 3]

[0043]
[Equation 3]

[0044]
(Step 63).
[0045]
[Outside 4]

[0046]
[Expression 4]

[0047]
(Step 64).
[0048]
FIG. 7 shows the procedure of other channel quality estimation (upstream SIR) in the measurement course.
[0049]
[Outside 5]

[0050]
[Equation 5]

[0051]
(Step 71).
[0052]
[Outside 6]

[0053]
[Formula 6]

[0054]
(Step 72).
[0055]
[Outside 7]

[0056]
[Expression 7]

[0057]
(Step 73).
[0058]
[Outside 8]

[0059]
[Equation 8]

[0060]
(Step 74).
[0061]
Next, a method for estimating the communication quality of other channels from the measured data in the entire service area regardless of the inside or outside of the measurement course will be described. In particular, here, a method of estimating communication quality using a path profile of actually measured data within a measurement course and using a path profile based on an estimation formula described below outside the measurement course will be described.
[0062]
FIG. 8 shows the procedure of other channel quality estimation (downlink SIR) in all service areas.
[0063]
[Outside 9]

[0064]
[Equation 9]

[0065]
[Outside 10]

[0066]
[Expression 10]

[0067]
[Outside 11]

[0068]
[Expression 11]

[0069]
(Step 84).
[0070]
[Outside 12]

[0071]
[Expression 12]

[0072]
(Step 85).
[0073]
FIG. 9 shows the procedure of other channel quality estimation (uplink SIR) in all service areas.
[0074]
[Outside 13]

[0075]
[Formula 13]

[0076]
[Outside 14]

[0077]
[Expression 14]

[0078]
Is obtained (step 93).
[0079]
[Outside 15]

[0080]
[Expression 15]

[0081]
(Step 94).
[0082]
[Outside 16]

[0083]
[Expression 16]

[0084]
(Step 95).
[0085]
8 and 9 described above show the calculation method of communication quality (SIR) when transmission power is set for each channel. On the contrary, when a desired communication quality (SIR) is set and the required transmission power at that time is obtained, it is sufficient to perform an iterative operation using the algorithm shown in FIG.
[0086]
To explain this, first, a required (desired) SIR value is set for each channel (step 101).
Next, an initial value of transmission power is set for each channel (step 102).
[0087]
Subsequently, other channel quality estimation (uplink) in all service areas or other channel quality estimation (downlink) in all service areas is performed (step 103). Next, the SIR is determined for each channel, and it is determined whether or not the SIR of all channels satisfies the required value (step 104). If not, the transmission power is updated for each channel (step 105). Returning to step 103, the transmission power updating process is repeated until step 104 is positively determined.
[0088]
If the SIRs of all channels satisfy the required value, the required transmission power for each channel is obtained (step 106).
[0089]
[Outside 17]

[0090]
(Other embodiments)
An object of the present invention is to supply a recording medium (storage medium) on which a program code of software for realizing the functions of the above-described embodiments is recorded to a system or apparatus, and the computer (or CPU) of the system or apparatus Needless to say, this can also be achieved by reading and executing the program code stored in the recording medium. In this case, the program code itself read from the recording medium realizes the functions of the above-described embodiment, and the recording medium on which the program code is recorded constitutes the present invention. As a recording medium for recording the program code and recording variable data such as a table, for example, a floppy disk, a hard disk, an optical disk, an IC-ROM, or the like can be used.
[0091]
【The invention's effect】
As described above, according to the present invention, since the communication quality of the other channel is estimated using various measurement results of the measurement channel, only one channel is actually measured for each radio area configuration unit. With respect to an arbitrary point, traffic distribution, and channel type, it is possible to perform communication quality evaluation of other communication channels that are not actually measured at the center. Therefore, the labor required for service area evaluation can be greatly reduced.
[0092]
Further, according to the present invention, by reflecting the actual measurement result on the evaluation of the entire area, it is possible to perform highly accurate area evaluation for all types of services.
[0093]
Furthermore, according to the present invention, the measurement system only needs to measure, record, and store only the measurement channel, and there is no need for the travel measurement for each channel. The sex can be improved dramatically.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing a configuration of another channel communication quality measurement system using a measurement channel in an embodiment of the present invention.
FIG. 2 is a block diagram showing an example of the configuration of hardware used to achieve the functions shown in FIG.
FIG. 3 is an explanatory diagram showing a concept of other channel quality estimation in a measurement course according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a concept of other channel quality estimation in all service areas according to an embodiment of the present invention.
FIG. 5 is a block diagram collectively showing the data flow and the interrelation between data when performing other channel quality estimation in the measurement course and other channel quality estimation in all service areas according to an embodiment of the present invention.
FIG. 6 is a flowchart showing a calculation processing procedure of other channel quality estimation (downlink SIR) in the measurement course in the embodiment of the present invention.
FIG. 7 is a flowchart showing a calculation processing procedure of other channel quality estimation (uplink SIR) in the measurement course in the embodiment of the present invention.
FIG. 8 is a flowchart showing a calculation processing procedure of other channel quality estimation (downlink SIR) in all service areas according to the embodiment of the present invention.
FIG. 9 is a flowchart showing a calculation processing procedure of other channel quality estimation (uplink SIR) in all service areas according to the embodiment of the present invention.
FIG. 10 is a flowchart showing a processing procedure for obtaining required transmission power in each channel according to the embodiment of the present invention.
FIG. 11 is a block diagram illustrating a method for obtaining a BER in each channel according to an embodiment of the present invention.
[Explanation of symbols]
1 Measurement Course 2 Mobile Measurement Vehicle 3 Base Station 4 Measurement Channel 5 Actual Measurement Data 6 Actual Measurement Database 7 Base Station Database 8 Traffic Database 9 Topographic / Building Database 10 Center-side Quality Estimator (Computer Unit)
21 Mobile measuring vehicle side receiver 22 Measuring device 23 Storage device 24 Storage medium 25 Driver 26 Storage device such as DRAM for storing various data databases 27 Storage device such as ROM for storing program 28 Monitor 29 Printer 31 Other channel 32 Up and down Communication quality 51 Other channel quality estimation block 52 in the measurement course 52 Other channel quality estimation block 56 in all service areas Actual measurement data 57 Base station data 58 Traffic data 59 Terrain / building data 111 BER estimation module (simulation program)

Claims

Received power, interference power in the service area using a specific measurement channel transmitted from a radio base station while traveling on a predetermined measurement course in a service area of a mobile communication system using spread signals such as CDMA , Movement measuring means for actually measuring reception characteristics including at least a path profile;
Other channels in which transmission conditions including at least one of transmission power, transmission rate, and chip rate are different from those for measurement using actual measurement data obtained by the mobile measurement means and a predetermined arithmetic expression for estimating communication quality Communication quality estimation means for estimating communication quality including at least one of SIR (reception power to interference power ratio) and BER (bit error rate) of the other channel communication quality using the measurement channel Estimation system.

The mobile measurement means measures reception characteristics and downlink interference power of the measurement channel, and the communication quality estimation means uses the reception characteristics and measured data of the downlink interference power acquired by the mobile measurement means to determine transmission conditions. 2. The other channel communication quality estimation system using a measurement channel according to claim 1, wherein communication quality of a downlink channel different from the measurement channel is estimated.

The communication quality estimator uses the reception characteristics of the measurement channel acquired by the mobile measurement unit and the measured data of uplink interference total power measured at each radio base station in the service area to determine whether the transmission condition is for the measurement 3. The other channel communication quality estimation system using a measurement channel according to claim 1, wherein the communication quality of an uplink channel different from the channel is estimated.

The communication quality estimation means includes the reception characteristics and downlink interference power of the measurement channel acquired by the mobile measurement means, actual measurement data of uplink interference total power measured at each radio base station in the service area, The reception characteristics outside the measurement course are estimated using each database of station data, traffic data, and terrain / building data, and the communication quality of another channel different from the measurement channel is estimated using the estimation result. An other channel communication quality estimation system using the measurement channel according to any one of claims 1 to 3.

The communication quality estimation means uses the actual measurement data on the measurement course, and estimation data calculated from various databases and the calculation formulas at other points, regardless of the shape of the traffic distribution inside or outside the measurement course. 5. The other channel communication quality estimation system using a measurement channel according to claim 4, wherein communication quality is estimated for each of the other channels in the entire service area.

The communication quality estimation means evaluates the communication quality of the measurement channel from the actual measurement data, and uses the evaluation result and the base station data to estimate the communication quality of the other channel on the measurement course, The communication quality of each other channel in the entire service area is estimated when a traffic distribution is assumed using the evaluation result, the base station data, the traffic data, and the terrain / building data. Item 5. Other channel communication quality estimation system using the measurement channel according to item 4.

The actual measurement data includes reception power, downlink interference power, path profile, total uplink interference power, and measurement channel transmission power for the measurement channel, and the base station data includes the position of each base station, antenna directivity, and transmission power. At least one of a transmission rate and a chip rate, the traffic data includes measured traffic and estimated traffic, and the terrain / building data includes at least one of altitude, land use, and building height, and the other channel estimation data includes The communication quality includes SIR, required transmission power, and BER, including path profile estimation data, downlink reception power estimation data, uplink reception power estimation data, downlink interference power estimation data, and uplink interference power estimation data. Item 6. Other channel communication quality estimation system using the measurement channel according to item 4. Beam.

The communication quality estimation means uses the downlink interference power of the measured data, the measurement channel transmission rate that is the transmission condition of the base station data, and the other channel transmission rate when estimating the other channel downlink SIR in the measurement course. The other channel downlink interference power is calculated, and the other channel downlink path profile is calculated using the measured data path profile, the measurement channel transmission power which is the transmission condition of the base station data, and the other channel downlink transmission power. The other channel downlink SIR is estimated by obtaining another channel downlink received power by totaling the channel downlink path profile and taking a ratio between the other channel downlink interference power and the other channel downlink received power. Other channel communication quality estimation system using the measurement channel described in 4 Temu.

The communication quality estimation means, when estimating the uplink SIR of other channels in the measurement course, uses the total uplink interference power of the measured data, the chip rate which is the transmission condition of the base station data, and the other channel transmission rate. An uplink interference power is calculated, an other channel uplink path profile is calculated using a path profile of the actual measurement data, a measurement channel transmission power that is a transmission condition of the base station data, and another channel uplink transmission power, and the other channel uplink power is calculated. The other channel uplink SIR is estimated by obtaining the other channel uplink received power by summing up the path profiles and taking the ratio of the other channel uplink interference power and the other channel uplink received power. Other channel communication quality estimation system using the measurement channel according to claim 8 .

The communication quality estimation means sets the transmission power for each downlink channel when estimating the downlink SIR of other channels in all service areas, and performs the measurement using the set transmission power, the base station data, and the terrain / building data. An estimated path profile outside the course is obtained, and the estimated path profile in the measurement course is determined using the set transmission power, the measured data path profile, and the transmission power of the measurement channel which is the transmission condition of the base station data. Obtaining a path profile at an arbitrary point from the estimated path profile outside the measurement course and the estimated path profile within the measurement course, obtaining the downlink received power of each channel from the sum of the estimated path profiles at any point, and The sum of downlink received power, the chip rate that is the transmission condition of the base station data, and other channels 9. Each channel downlink SIR is estimated by calculating each channel downlink interference power using a transmission rate and taking a ratio between each channel downlink interference power and each channel downlink reception power. , 9. Other channel communication quality estimation system using the measurement channel according to any one of the above.

The communication quality estimation means sets the transmission power for each uplink channel when estimating the uplink SIR of other channels in all service areas, and uses the set transmission power, the base station data, and the terrain / building data to perform the measurement. An estimated path profile outside the course is obtained, and the estimated path profile in the measurement course is determined using the set transmission power, the measured data path profile, and the transmission power of the measurement channel which is the transmission condition of the base station data. Obtaining a path profile at an arbitrary point from the estimated path profile outside the measurement course and the estimated path profile within the measurement course, and obtaining each channel uplink received power from the sum of the estimated path profiles at any point, The sum of the uplink received power, the chip rate that is the transmission condition of the base station data, and other channels 9. Each channel uplink SIR is estimated by calculating each channel uplink interference power using a transmission rate and taking a ratio between each channel uplink interference power and each channel uplink reception power. , 9, 10 Other channel communication quality estimation system using the measurement channel according to any one of the above.

The communication quality estimating means, when estimating the required transmission power in each channel, set the required SIR value for each channel, it sets the initial value of the transmission power for each channel, perform other channel quality estimation in all service areas After that, for each channel, it is determined whether the SIRs of all the channels satisfy the required SIR value, and the required transmission power in each channel is estimated by updating the transmission power for each channel until this is affirmative. The other channel communication quality estimation system using the measurement channel according to claim 4.

5. The measurement channel according to claim 4, wherein the communication quality estimation unit calculates a BER in each channel using an SIR of each channel, a path profile of each channel, and a transmission condition of the base station data. The other channel communication quality estimation system used.

Received power, interference power in the service area using a specific measurement channel transmitted from a radio base station while traveling on a predetermined measurement course in a service area of a mobile communication system using spread signals such as CDMA , A movement measurement step for actually measuring reception characteristics including at least a path profile;
Other channels in which transmission conditions including at least one of transmission power, transmission rate, and chip rate are different from the measurement channel using the actual measurement data obtained in the movement measurement step and a predetermined arithmetic expression for estimating communication quality Communication quality estimation step for estimating communication quality including at least one of SIR (reception power to interference power ratio) and BER (bit error rate) of the other channel communication quality using the measurement channel Estimation method.

In the mobile measurement step, the reception characteristics and downlink interference power of the measurement channel are measured, and in the communication quality estimation step, the transmission conditions are determined using the reception characteristics and the measured data of the downlink interference power acquired in the mobile measurement step. 15. The method for estimating communication quality of other channels using a measurement channel according to claim 14, wherein communication quality of a downlink channel different from the measurement channel is estimated.

In the communication quality estimation step, the transmission condition is determined for the measurement using the reception characteristics of the measurement channel acquired in the mobile measurement step and the measured data of the total uplink interference power measured in each radio base station in the service area. 16. The other channel communication quality estimation method using a measurement channel according to claim 14 or 15, wherein the communication quality of an uplink channel different from the channel is estimated.

In the communication quality estimation step, in addition to the reception characteristics and downlink interference power of the measurement channel acquired in the mobile measurement step, actual measurement data of uplink interference total power measured at each radio base station in the service area, The reception characteristics outside the measurement course are estimated using each database of station data, traffic data, and terrain / building data, and the communication quality of another channel different from the measurement channel is estimated using the estimation result. An other channel communication quality estimation method using the measurement channel according to any one of claims 14 to 16.

In the communication quality estimation step, the actual measurement data on the measurement course, and the estimation data calculated from the various databases and the calculation formulas at other points are used regardless of the shape of the traffic distribution inside and outside the measurement course. The communication quality estimation method using a measurement channel according to claim 17, wherein communication quality is estimated for each of the other channels in the entire service area.

In the communication quality estimation step, the communication quality of the measurement channel is evaluated from the actual measurement data, and using the evaluation result and the base station data, the communication quality of the other channel on the measurement course is estimated, The communication quality of each other channel in the entire service area is estimated when a traffic distribution is assumed using the evaluation result, the base station data, the traffic data, and the terrain / building data. Item 18. Another channel communication quality estimation method using the measurement channel according to Item 17.

The actual measurement data includes reception power, downlink interference power, path profile, total uplink interference power, and measurement channel transmission power for the measurement channel, and the base station data includes the position of each base station, antenna directivity, and transmission power. At least one of a transmission rate and a chip rate, the traffic data includes measured traffic and estimated traffic, and the topography / building data includes at least one of altitude, land use, and building height, and the other channel estimation data includes The communication quality includes SIR, required transmission power, and BER, including path profile estimation data, downlink reception power estimation data, uplink reception power estimation data, downlink interference power estimation data, and uplink interference power estimation data. Item 18. Other channel communication quality estimation method using measurement channel according to item 17 .

In the communication quality estimation step, when estimating the downlink SIR of other channels in the measurement course, the downlink interference power of the measured data, the measurement channel transmission rate that is the transmission condition of the base station data, and the other channel transmission rate are used. The other channel downlink interference power is calculated, and the other channel downlink path profile is calculated using the measured data path profile, the measurement channel transmission power which is the transmission condition of the base station data, and the other channel downlink transmission power. The other channel downlink SIR is estimated by obtaining another channel downlink received power by totaling the channel downlink path profile and taking a ratio between the other channel downlink interference power and the other channel downlink received power. Other channel communication products using the measurement channel described in 17 Estimation method.

In the communication quality estimation step, when estimating the uplink SIR of other channels in the measurement course, the total interference power of the actually measured data, the chip rate that is the transmission condition of the base station data, and the other channel transmission rate are used. An uplink interference power is calculated, an other channel uplink path profile is calculated using a path profile of the actual measurement data, a measurement channel transmission power that is a transmission condition of the base station data, and another channel uplink transmission power, and the other channel uplink power is calculated. 18. The other channel uplink SIR is estimated by obtaining the other channel uplink received power by summing up the path profiles and taking the ratio of the other channel uplink interference power and the other channel uplink received power. Communication quality of other channels using the measurement channel described in 21 Constant method.

In the communication quality estimation step, when estimating the downlink SIR of other channels in all service areas, transmission power is set for each downlink channel , and the measurement is performed using the set transmission power, the base station data, and the topography / building data. An estimated path profile outside the course is obtained, and the estimated path profile in the measurement course is determined using the set transmission power, the measured data path profile, and the transmission power of the measurement channel which is the transmission condition of the base station data. Obtaining a path profile at an arbitrary point from the estimated path profile outside the measurement course and the estimated path profile within the measurement course, obtaining the downlink received power of each channel from the sum of the estimated path profiles at any point, and The sum of downlink received power, the chip rate that is the transmission condition of the base station data, 18. The channel downlink interference power is calculated using a channel transmission rate, and each channel downlink SIR is estimated by taking a ratio between each channel downlink interference power and each channel downlink received power. 23. Another channel communication quality estimation method using the measurement channel according to any one of 21 and 22.

In the communication quality estimation step, when estimating the uplink SIR of other channels in all service areas, transmission power is set for each uplink channel , and the measurement is performed using the set transmission power, the base station data, and the topography / building data. An estimated path profile outside the course is obtained, and the estimated path profile in the measurement course is determined using the set transmission power, the measured data path profile, and the transmission power of the measurement channel which is the transmission condition of the base station data. Obtaining a path profile at an arbitrary point from the estimated path profile outside the measurement course and the estimated path profile within the measurement course, and obtaining each channel uplink received power from the sum of the estimated path profiles at any point, The sum of the uplink received power, the chip rate that is the transmission condition of the base station data, 18. Each channel uplink SIR is estimated by calculating each channel uplink interference power using a channel transmission rate and taking a ratio of each channel uplink interference power and each channel uplink received power. 24. Another channel communication quality estimation method using the measurement channel according to any one of 21, 22, and 23.

In the communication quality estimation step, when estimating the required transmission power in each channel, set the required SIR value for each channel, it sets the initial value of the transmission power for each channel, perform other channel quality estimation in all service areas After that, for each channel, it is determined whether the SIRs of all the channels satisfy the required SIR value, and the required transmission power in each channel is estimated by updating the transmission power for each channel until this is affirmative. The other channel communication quality estimation method using the measurement channel according to claim 17.

18. The measurement channel according to claim 17, wherein, in the communication quality estimation step, a BER in each channel is calculated using an SIR of each channel, a path profile of each channel, and a transmission condition of the base station data. The other channel communication quality estimation method used.