JP4103614B2

JP4103614B2 - Abnormal disconnection cause analysis system, method, abnormal disconnect call investigation device and program in mobile communication

Info

Publication number: JP4103614B2
Application number: JP2003032342A
Authority: JP
Inventors: 佳明大塚
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 2003-02-10
Filing date: 2003-02-10
Publication date: 2008-06-18
Anticipated expiration: 2023-02-10
Also published as: JP2004242259A

Description

【０００１】
【発明の属する技術分野】
本発明は、移動通信における異常切断原因解析システム，方法，異常切断呼調査装置およびプログラムに関し、特に携帯電話機，ＰＨＳ（Ｐersonal Ｈandyphone Ｓystem）等の携帯移動端末と基地局との間の無線回線確立後に何らかの理由により無線回線を確立できなくなって切断した場合や、発信時，着信時，無線回線切替時において無線回線の確立不可により通信確立に至る接続途中で呼を切断した場合を対象とした、移動通信における異常切断原因解析システム，方法，異常切断呼調査装置およびプログラムに関する。
【０００２】
【従来の技術】
近年、携帯電話機等の携帯移動端末の普及により移動通信が広く利用されている。移動通信においては電波を使用して無線回線を確立するため、有線回線を利用した通信に比較すると、携帯移動端末と基地局との間の無線回線が確立できず接続できなかったり、接続後の通信中であっても無線回線の確立ができなくなり回線断にて呼切断となる可能性が非常に大きい。そのため、移動通信における無線回線の確立ができない状況をいかに少なくし回線接続品質を高く維持するかが重要となってきている。
【０００３】
なお、移動通信システムにおいて、相手との通信中に無線回線の確立ができなくなり回線断になる例は、例えば、特開平１０−１９０８４１号公報（特許文献１）や特開２０００−１８４４４３号公報（特許文献２）に記載されている。これらの公報においては、携帯移動端末と基地局の間の電波受信強度の低下により無線回線の確立ができなくなった場合に、無線回線を切断する一方、相手端末から音声メッセージを受け付けて蓄積し、次に無線回線の確立がされたときに、蓄積された音声メッージを携帯移動端末に送信することが記載されている。
【０００４】
また、従来、例えば携帯移動端末と基地局の間の無線回線断が発生した場合には、保守担当者が発生した無線基地局のサービスエリア内の電界強度の測定をしたり、サービスエリア内を実際に移動しながら通話試験を行う等の調査により、無線回線切断時の携帯移動端末の場所や原因を推定するということが一般的に行われている。
【０００５】
【特許文献１】
特開平１０−１９０８４１号公報（段落[００１１]〜[００１２]、図１）
【特許文献２】
特開２０００−１８４４４３号公報（段落[００１７]〜[００１８]、図２）
【０００６】
【発明が解決しようとする課題】
しかし、上述した特許文献１または特許文献２に記載の発明においては、電波受信強度の低下により無線回線が切断されることの記載はあるものの、切断原因の究明そのものに関する記載は無く、切断原因の迅速かつ精度の高い解析により無線回線接続品質の向上を図るという点については考えられていない。
【０００７】
また、保守担当者による電界強度の測定や通話試験による実地調査により、無線回線断時の場所や原因を推定する従来の方法においては、調査のために時間と工数を膨大に費やさなければならず、通信事業者の負担が非常に大きいという問題がある。また、無線回線断が発生した無線基地局により発生場所が該当無線基地局のサービスエリア内ということは分かるものの、サービスエリア内の具体的な発生場所の特定や発生状況の特定は保守担当者の推定に委ねられるため、切断原因の正確な解明が難しいという問題もある。
【０００８】
本発明は、以上の問題を解決する、移動通信における異常切断原因解析システム，方法，異常切断呼調査装置およびプログラムを提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明の第１の移動通信における異常切断原因解析システムは、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えた移動通信における異常切断原因解析システムであって、
前記携帯移動機と前記基地局間の無線回線が異常切断されたときに、前記移動通信交換機から前記保守情報管理装置を介して前記異常切断呼調査装置に異常切断呼情報を送信する手段と、前記異常切断呼調査装置が前記異常切断呼情報に含まれる切断理由によりアンケート調査の要否を判断する手段と、アンケート調査が必要な切断理由であった場合に、前記異常切断呼調査装置がアンケート調査依頼メールを前記携帯移動機に送信する手段と、前記携帯移動機が前記アンケート調査依頼メールに記載されたアクセス先である前記異常切断呼調査装置にアクセスする手段と、アクセスされた前記異常切断呼調査装置がアンケート帳票画面情報を前記携帯移動機に送信する手段と、ユーザが前記携帯移動機の画面上でアンケート回答内容を入力し送信する手段と、アンケート回答を受信した前記異常切断呼調査装置が、アンケート回答内容に基づいて異常切断の発生場所の特定と原因の解析とを行う手段とを有する。
【００１０】
本発明の第２の移動通信における異常切断原因解析システムは、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えた移動通信における異常切断原因解析システムであって、
前記保守情報管理装置が前記移動通信交換機から定期的に送信される無線回線の使用状況を示すトラヒック情報と、各基地局における干渉波情報と、無線回線毎の電界強度情報とを受信し蓄積する手段と、前記携帯移動機と前記基地局間の無線回線が異常切断されたときに、前記移動通信交換機から前記保守情報管理装置を介して前記異常切断呼調査装置に異常切断呼情報を送信する手段と、前記異常切断呼調査装置が前記異常切断呼情報に含まれる切断理由によりアンケート調査の要否を判断する手段と、アンケート調査が必要な切断理由であった場合に、前記異常切断呼調査装置がアンケート調査依頼メールを前記携帯移動機に送信する手段と、前記携帯移動機が前記アンケート調査依頼メールに記載されたアクセス先である前記異常切断呼調査装置にアクセスする手段と、アクセスされた前記異常切断呼調査装置がアンケート帳票画面情報を前記携帯移動機に送信する手段と、ユーザが前記携帯移動機の画面上でアンケート回答内容を入力し送信する手段と、アンケート回答を受信した前記異常切断呼調査装置が、アンケート回答内容に基づいて異常切断の発生場所の特定を行う手段と、前記異常切断呼調査装置が、アンケート回答内容および前記保守情報管理装置に蓄積されたトラヒック情報，干渉波情報，電界強度情報を参照して切断原因の解析を行う手段とを有する。
【００１１】
本発明の第３の移動通信における異常切断原因解析システムは、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えた移動通信における異常切断原因解析システムであって、
前記携帯移動機と前記基地局間の無線回線が異常切断される度に、前記移動通信交換機から前記保守情報管理装置を介して前記異常切断呼調査装置に異常切断呼情報を送信する手段と、前記異常切断呼調査装置が受信した異常切断呼情報を蓄積する手段と、前記異常切断呼調査装置が一定時間毎に過去の一定時間に蓄積された異常切断呼情報を対象として、前記異常切断呼情報に含まれる切断理由および予め設定された付加条件によりアンケート調査の要否を判断する手段と、アンケート調査が必要と判断された場合に、前記異常切断呼調査装置がアンケート調査依頼メールを該当携帯移動機に送信する手段と、前記携帯移動機が前記アンケート調査依頼メールに記載されたアクセス先である前記異常切断呼調査装置にアクセスする手段と、アクセスされた前記異常切断呼調査装置がアンケート帳票画面情報を前記携帯移動機に送信する手段と、ユーザが前記携帯移動機の画面上でアンケート回答内容を入力し送信する手段と、アンケート回答を受信した前記異常切断呼調査装置が、アンケート回答内容に基づいて異常切断の発生場所の特定と原因の解析とを行う手段とを有する。
【００１２】
本発明の第４の移動通信における異常切断原因解析システムは、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えた移動通信における異常切断原因解析システムであって、
前記保守情報管理装置が前記移動通信交換機から定期的に送信される無線回線の使用状況を示すトラヒック情報と、各基地局における干渉波情報と、無線回線毎の電界強度情報とを受信し蓄積する手段と、前記携帯移動機と前記基地局間の無線回線が異常切断される度に、前記移動通信交換機から前記保守情報管理装置を介して前記異常切断呼調査装置に異常切断呼情報を送信する手段と、前記異常切断呼調査装置が受信した異常切断呼情報を蓄積する手段と、前記異常切断呼調査装置が一定時間毎に過去の一定時間に蓄積された異常切断呼情報を対象として、前記異常切断呼情報に含まれる切断理由および予め設定された付加条件によりアンケート調査の要否を判断する手段と、アンケート調査が必要と判断された場合に、前記異常切断呼調査装置がアンケート調査依頼メールを該当携帯移動機に送信する手段と、前記携帯移動機が前記アンケート調査依頼メールに記載されたアクセス先である前記異常切断呼調査装置にアクセスする手段と、アクセスされた前記異常切断呼調査装置がアンケート帳票画面情報を前記携帯移動機に送信する手段と、ユーザが前記携帯移動機の画面上でアンケート回答内容を入力し送信する手段と、アンケート回答を受信した前記異常切断呼調査装置が、アンケート回答内容に基づいて異常切断の発生場所の特定を行う手段と、前記異常切断呼調査装置が、アンケート回答内容および前記保守情報管理装置に蓄積されたトラヒック情報，干渉波情報，電界強度情報を参照して切断原因の解析を行う手段とを有する。
【００１３】
本発明の第５の移動通信における異常切断原因解析システムは、本発明の第３または第４のの移動通信における異常切断原因解析システムにおいて、前記付加条件は、切断した無線回線番号に偏りがあること、切断した時刻に偏りがあること、無線回線切断回数がある時間内に予め設定されたしきい値を越えていること、通信の相手方に偏りがあること、特定の携帯移動機の無線回線切断回数がある時間内に予め設定されたしきい値を越えていることを含み、いずれか一つの条件または複数の条件の組合せが適用されることを特徴とする。
【００１４】
本発明の第６の移動通信における異常切断原因解析システムは、本発明の第１〜第５のいずれかの移動通信における異常切断原因解析システムにおいて、前記異常切断呼情報は、無線回線切断理由、切断した無線回線番号、切断した日時、切断したときの通信の相手方加入者番号、異常切断となった携帯移動機の移動機管理番号、移動機加入者番号、移動機メールアドレスを含むことを特徴とする。
【００１５】
本発明の第７の移動通信における異常切断原因解析システムは、本発明の第１〜第６のいずれかの移動通信における異常切断原因解析システムにおいて、前記アンケート回答内容は、切断したときの場所、屋内か屋外か、移動中だったか停止中だったか、移動手段の少なくともいずれかひとつを含むことを特徴とする。
【００１６】
本発明の第８の移動通信における異常切断原因解析システムは、本発明の第１〜第７のいずれかの移動通信における異常切断原因解析システムにおいて、前記アンケート帳票はユーザ毎に生成され、切断日時および切断が発生した基地局のカバーするエリアの地域名を予め記載して前記携帯移動機に送信することを特徴とする。
【００１７】
本発明の第９の移動通信における異常切断原因解析システムは、本発明の第１〜第８のいずれかの移動通信における異常切断原因解析システムにおいて、前記携帯移動機と前記基地局間の無線回線の異常切断は、発信側ユーザまたは着信側ユーザが通信終了により自発的に呼を終了した場合以外の原因による無線回線の切断であり、通信中に切断された場合、前記携帯移動機から発信した際に無線回線が確立できず通信確立に至る接続途中で切断された場合、前記携帯移動機に着信があった際に無線回線が確立できず接続途中で切断された場合、無線回線の切り替えを行う際に無線回線が確立できず切断された場合、を含むことを特徴とする。
【００１８】
本発明の第１の異常切断呼調査装置は、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えたシステムにおける異常切断呼調査装置であって、
前記移動通信交換機から前記保守情報管理装置を介して送られる異常切断呼情報を受信する手段と、受信した異常切断呼情報に含まれる切断理由によりアンケート調査の要否を判断する手段と、アンケート調査が必要な切断理由であった場合に、アンケート調査依頼メールを前記携帯移動機に送信する手段と、前記携帯移動機からのアクセス時にアンケート帳票画面情報を前記携帯移動機に送信する手段と、前記携帯移動機から送られたアンケート回答内容を受信する手段と、アンケート回答内容に基づいて異常切断の発生場所の特定と原因の解析とを行う手段とを有する。
【００１９】
本発明の第２の異常切断呼調査装置は、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えたシステムにおける異常切断呼調査装置であって、
前記移動通信交換機から前記保守情報管理装置を介して送られる異常切断呼情報を受信する手段と、受信した異常切断呼情報に含まれる切断理由によりアンケート調査の要否を判断する手段と、アンケート調査が必要な切断理由であった場合に、アンケート調査依頼メールを前記携帯移動機に送信する手段と、前記携帯移動機からのアクセス時にアンケート帳票画面情報を前記携帯移動機に送信する手段と、前記携帯移動機から送られたアンケート回答内容を受信する手段と、アンケート回答内容に基づいて異常切断の発生場所の特定を行う手段と、アンケート回答内容および前記保守情報管理装置に蓄積されたトラヒック情報，干渉波情報，電界強度情報を参照して切断原因の解析を行う手段とを有する。
【００２０】
本発明の第３の異常切断呼調査装置は、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えたシステムにおける異常切断呼調査装置であって、
前記移動通信交換機から前記保守情報管理装置を介して送られる異常切断呼情報を受信し蓄積する手段と、一定時間毎に過去の一定時間に蓄積された異常切断呼情報を対象として、前記異常切断呼情報に含まれる切断理由および予め設定された付加条件によりアンケート調査の要否を判断する手段と、アンケート調査が必要と判断された場合に、アンケート調査依頼メールを該当携帯移動機に送信する手段と、前記携帯移動機からのアクセス時にアンケート帳票画面情報を前記携帯移動機に送信する手段と、前記携帯移動機から送られたアンケート回答内容を受信する手段と、アンケート回答内容に基づいて異常切断の発生場所の特定と原因の解析とを行う手段とを有する。
【００２１】
本発明の第４の異常切断呼調査装置は、携帯移動機と、前記携帯移動機と無線回線で接続される基地局と、移動通信交換機と、前記移動通信交換機と接続されている保守情報管理装置と、前記保守情報管理装置と接続されている異常切断呼調査装置と、前記移動通信交換機と前記異常切断呼調査装置とが接続されたインターネットとを備えたシステムにおける異常切断呼調査装置であって、
前記移動通信交換機から前記保守情報管理装置を介して送られる異常切断呼情報を受信し蓄積する手段と、一定時間毎に過去の一定時間に蓄積された異常切断呼情報を対象として、前記異常切断呼情報に含まれる切断理由および予め設定された付加条件によりアンケート調査の要否を判断する手段と、アンケート調査が必要と判断された場合に、アンケート調査依頼メールを該当携帯移動機に送信する手段と、前記携帯移動機からのアクセス時にアンケート帳票画面情報を前記携帯移動機に送信する手段と、前記携帯移動機から送られたアンケート回答内容を受信する手段と、アンケート回答内容に基づいて異常切断の発生場所の特定を行う手段と、アンケート回答内容および前記保守情報管理装置に蓄積されたトラヒック情報，干渉波情報，電界強度情報を参照して切断原因の解析を行う手段とを有する。
【００２２】
本発明の第５の異常切断呼調査装置は、本発明の第３または第４の異常切断呼調査装置において、前記付加条件は、切断した無線回線番号に偏りがあること、切断した時刻に偏りがあること、無線回線切断回数がある時間内に予め設定されたしきい値を越えていること、通信の相手方に偏りがあること、特定の携帯移動機の無線回線切断回数がある時間内に予め設定されたしきい値を越えていることを含み、いずれか一つの条件または複数の条件の組合せが適用されることを特徴とする。
【００２３】
本発明の第６の異常切断呼調査装置は、本発明の第１〜第５のいずれかの異常切断呼調査装置において、前記異常切断呼情報は、無線回線切断理由、切断した無線回線番号、切断した日時、切断したときの通信の相手方加入者番号、異常切断となった携帯移動機の移動機管理番号、移動機加入者番号、移動機メールアドレスを含むことを特徴とする。
【００２４】
本発明の第７の異常切断呼調査装置は、本発明の第１〜第６のいずれかの異常切断呼調査装置において、前記アンケート回答内容は、切断したときの場所、屋内か屋外か、移動中だったか停止中だったか、移動手段の少なくともいずれかひとつを含むことを特徴とする。
【００２５】
本発明の第８の異常切断呼調査装置は、本発明の第１〜第７のいずれかの異常切断呼調査装置において、前記アンケート帳票はユーザ毎に生成され、切断日時および切断が発生した基地局のカバーするエリアの地域名を予め記載して前記携帯移動機に送信することを特徴とする。
【００２６】
本発明の第１の異常切断原因解析方法は、携帯移動機と基地局間の無線回線の異常切断原因を解析する異常切断原因解析方法であって、異常切断発生時に異常切断呼情報を移動通信交換機から異常切断呼調査装置に送信し、前記異常切断呼調査装置は前記異常切断呼情報に含まれる切断理由により原因解析調査の要否を決定し、調査が必要な場合に前記携帯移動機にアンケート調査を依頼し、受信したアンケート回答内容により異常切断原因の解析を行うことを特徴とする。
【００２７】
本発明の第２の異常切断原因解析方法は、携帯移動機と基地局間の無線回線の異常切断原因を解析する異常切断原因解析方法であって、異常切断発生時に異常切断呼情報を移動通信交換機から異常切断呼調査装置に送信し、前記異常切断呼調査装置は前記異常切断呼情報に含まれる切断理由により原因解析調査の要否を決定し、調査が必要な場合に前記携帯移動機にアンケート調査を依頼し、受信したアンケート回答内容および外部の保守情報管理装置から取得した各基地局のトラヒック情報，干渉波情報，電界強度情報を参照して異常切断原因の解析を行うことを特徴とする。
【００２８】
本発明の第３の異常切断原因解析方法は、携帯移動機と基地局間の無線回線の異常切断原因を解析する異常切断原因解析方法であって、異常切断が発生する度に異常切断呼情報を移動通信交換機から異常切断呼調査装置に送信し、前記異常切断呼調査装置は前記異常切断呼情報を蓄積し、一定時間毎に過去の一定時間に蓄積された異常切断呼情報を対象として、前記異常切断呼情報に含まれる切断理由および予め設定された付加条件により原因解析調査の要否を決定し、調査が必要な場合に前記携帯移動機にアンケート調査を依頼し、受信したアンケート回答内容により異常切断原因の解析を行うことを特徴とする。
【００２９】
本発明の第４の異常切断原因解析方法は、携帯移動機と基地局間の無線回線の異常切断原因を解析する異常切断原因解析方法であって、異常切断が発生する度に異常切断呼情報を移動通信交換機から異常切断呼調査装置に送信し、前記異常切断呼調査装置は前記異常切断呼情報を蓄積し、一定時間毎に過去の一定時間に蓄積された異常切断呼情報を対象として、前記異常切断呼情報に含まれる切断理由および予め設定された付加条件により原因解析調査の要否を決定し、調査が必要な場合に前記携帯移動機にアンケート調査を依頼し、受信したアンケート回答内容および外部の保守情報管理装置から取得した各基地局のトラヒック情報，干渉波情報，電界強度情報を参照して異常切断原因の解析を行うことを特徴とする。
【００３０】
本発明のプログラムは、本発明の第１〜第８のいずれかの異常切断呼調査装置としてコンピュータを機能させる。
【００３１】
【発明の実施の形態】
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。
【００３２】
図１は、本発明の一実施の形態の構成を示す図であり、携帯移動機１０と、基地局２０と、移動通信交換機３０と、保守情報管理装置４０と、異常切断呼調査装置５０と、インターネット６０とを備えている。携帯移動機１０と基地局２０とは無線回線にて通信を確立しており、移動通信交換機３０を介して相手方と通信している。移動通信交換機３０はインターネット６０と接続されている。また、移動通信交換機３０と保守情報管理装置４０が接続されており、さらに保守情報管理装置４０と異常切断呼調査装置５０が接続されている。異常切断呼調査装置５０はインターネット６０にも接続されている。
【００３３】
携帯移動機１０は、携帯電話機，ＰＨＳ等の携帯移動端末であり、メールを送受信する機能と、インターネット６０と接続しＷＥＢ情報を送受信できるブラウザ機能とを備えている。
【００３４】
基地局２０は、携帯移動機１０と無線回線を確立するための機能と、無線回線を確立した後に無線回線を維持する機能と、無線回線を切断する機能と、無線回線を切断する際の切断理由を判断する機能と、無線回線を切断した際に切断理由／切断した無線回線番号／切断した日時／切断したときの通信の相手方加入者番号（電話番号）を移動通信交換機３０へ通知する機能と、無線回線の使用率等の回線使用状況を示すトラヒック情報／通信中の無線回線の電界よりも強い干渉波を受けている場合の干渉波情報／通信中の無線回線毎の電界強度情報を常時測定して移動通信交換機３０へ通知する機能とを備えている。なお、トラヒック情報／通信中の無線回線毎の電界強度情報については、定期的に移動通信交換機３０に通知するようにしてもよいし常時通知するようにしてもよい。干渉波情報については、定期的に通知するようにしてもよいし発生時点で通知するようにしてもよい。また、トラヒック情報／干渉波情報／電界強度情報は測定日時と対応付けられて通知される。
【００３５】
移動通信交換機３０は、携帯移動機１０と基地局２０が無線回線を確立した後に通信を確立する機能と、通信を維持する機能と、通信を切断する機能と、通信を切断する際の切断理由を判断する機能と、携帯移動機１０の位置を管理する機能と、携帯移動機１０を呼び出す機能と、無線回線の異常切断時に基地局２０から通知された無線回線切断理由／切断した無線回線番号／切断した日時／切断したときの通信の相手方加入者番号と移動通信交換機３０自身が記憶している携帯移動機１０の移動機管理番号（移動機固有の識別子）／移動機加入者番号（電話番号）／移動機メールアドレスとを異常切断呼情報として保守情報管理装置４０へ通知する機能と、基地局２０から定期的に送信されるトラヒック情報／干渉波情報／通信中の無線回線毎の電界強度情報を保守情報管理装置４０へ通知する機能と、インターネットを介して送られてきた携帯移動機１０へのメールを携帯移動機１０へ着信させる機能と、携帯移動機１０とインターネット６０を接続する回線を確立する機能とを備えている。
【００３６】
保守情報管理装置４０は、サーバ等の情報処理装置であり、図示しない記憶部に格納されたプログラムにより動作を制御される制御部４１と、異常切断呼情報記憶部４２と、トラヒック情報記憶部４３と、干渉波情報記憶部４４と、電界強度情報記憶部４５とを備えている。
【００３７】
制御部４１は、移動通信交換機３０から通知された異常切断呼における異常切断呼情報（無線回線切断理由／切断した無線回線番号／切断した日時／切断したときの通信の相手方加入者番号／異常切断となった携帯移動機１０の移動機管理番号／移動機加入者番号／移動機メールアドレス）を異常切断呼情報記憶部４２に記憶させるとともに、異常切断呼調査装置５０に転送する機能と、基地局２０から移動通信交換機３０を介して通知されたトラヒック情報／干渉波情報／通信中の無線回線毎の電界強度情報を、トラヒック情報記憶部４３，干渉波情報記憶部４４，電界強度情報記憶部４５にそれぞれ記憶させる機能と、異常切断呼調査装置５０からトラヒック情報／干渉波情報／電界強度情報の参照要求があったときにこれら情報を送信する機能とを備えている。
【００３８】
異常切断呼情報記憶部４２には、異常切断発生の度に移動通信交換機３０から通知される異常切断呼情報（無線回線切断理由／切断した無線回線番号／切断した日時／切断したときの通信の相手方加入者番号／異常切断となった携帯移動機１０の移動機管理番号／移動機加入者番号／移動機メールアドレス）が格納されている。
【００３９】
トラヒック情報記憶部４３には、移動通信交換機３０を介して通知された各基地局２０の無線回線の使用率等の回線使用状況を示すトラヒック情報が、測定日時とともに格納されている。このトラヒック情報を基に、異常切断呼調査装置５０が指定日時における各基地局２０の無線回線の輻輳状態の判別を行う。
【００４０】
干渉波情報記憶部４４には、移動通信交換機３０を介して通知された各基地局２０の通信中の無線回線の電界よりも強い干渉波情報（干渉波レベルや発生日時）が格納されている。この干渉波情報を基に、異常切断呼調査装置５０が指定日時における各基地局２０の干渉波の有無の判別を行う。
【００４１】
電界強度情報記憶部４５には、移動通信交換機３０を介して通知された各基地局２０の通信中の無線回線毎の電界強度情報が、測定日時とともに格納されている。この電界強度情報を基に、異常切断呼調査装置５０が指定無線回線および指定日時における電界強度の変化を判別する。
【００４２】
異常切断呼調査装置５０は、サーバ等の情報処理装置であり、図示しない記憶部に格納されたプログラムにより動作を制御される制御部５１と、異常切断呼情報記憶部５２と、基地局別地域名記憶部５３と、アンケート帳票・回答記憶部５４と、異常切断呼原因解析結果記憶部５５とを備えている。
【００４３】
制御部５１は、保守情報管理装置４０から転送されてくる異常切断呼情報を受信し異常切断呼情報記憶部５２に記憶させる機能と、異常切断呼情報から携帯移動機１０のユーザへのアンケート調査が必要かどうかを判断する機能と、ユーザへのアンケート調査が必要と判断したときに、ユーザ宛てにアンケート調査依頼メールを生成しインターネット６０経由で送信する機能と、ユーザからのアンケート調査に関するアクセスを受け付ける機能と、ユーザからのアンケート調査に関するアクセスに対して異常切断呼情報に基づきユーザが容易に回答できるようなアンケート帳票を送出する機能と、ユーザからのアンケート帳票の回答を受け付ける機能と、アンケート回答内容を解析し異常切断呼の場所を特定する機能と、アンケート回答内容を解析し異常切断呼の原因を推定する機能と、ユーザへのアンケート回答協力のお礼と異常切断対策実施報告のメールを生成しインターネット６０経由で送信する機能とを備えている。
【００４４】
異常切断呼情報記憶部５２には、保守情報管理装置４０から転送された異常切断呼情報が格納されている。基地局別地域名記憶部５３には、各基地局がカバーするエリアの地域名（例えば、住所等）が無線回線番号に対応して予め登録されている。または各基地局が設置されている地域名を登録するようにしてもよい。なお、無線回線番号は該当基地局番号を含んで構成されており、無線回線番号から基地局を特定することは可能である。アンケート帳票・回答記憶部５４には、制御部５１によりユーザ対応のアンケート帳票とアンケート回答内容がユーザ毎のＵＲＬ（Ｕniform Ｒesource Ｌocator）に対応して格納される。異常切断呼原因解析結果記憶部５５には、アンケート回答内容に基づいて制御部５１が解析した異常切断の推定原因や、別途保守担当者により実施された対策，報告対象のユーザのメールアドレスが格納される。
【００４５】
次に、本発明の一実施の形態の動作について図１〜図４を参照して説明する。
【００４６】
図２は、本発明の一実施の形態の動作を示すフローチャートであり、携帯移動機１０と基地局２０および移動通信交換機３０が既に通信を確立している状態で、携帯移動機１０と基地局２０間の無線回線が何らかの理由により異常切断された場合における動作を示している。
【００４７】
ここで、異常切断とは、発信側ユーザまたは着信側ユーザが通信終了後に自発的に呼を終了した場合以外の原因による回線の切断のことであり、本発明においては携帯移動機１０と基地局２０の間の無線回線の切断を対象にしている。例えば、携帯移動機１０と基地局２０との間の無線回線確立後に何らかの理由により無線回線を確立できなくなって切断した場合や、発信時，着信時，無線回線切替時において無線回線の確立不可により通信確立に至る接続途中で呼を切断した場合を含んでいる。
【００４８】
図３はユーザへのアンケート調査依頼メールの一例を示す図であり、図４はユーザ対応のアンケート帳票の一例を示す図である。
【００４９】
図２を参照すると、携帯移動機１０と基地局２０および移動通信交換機３０が既に通信を確立している状態（ステップＡ１）において、基地局２０が携帯移動機１０と基地局２０間の無線回線の異常切断を検出すると（ステップＡ２）、基地局２０から無線回線切断理由／切断した無線回線番号／切断した日時／切断したときの通信の相手方加入者番号が移動通信交換機３０に送られ、これらを受信した移動通信交換機３０は自身が記憶している該当携帯移動機１０の移動機管理番号（移動機固有の識別子）／移動機加入者番号（電話番号）／移動機メールアドレスとともに異常切断呼情報として保守情報管理装置４０に転送する（ステップＡ３）。すなわち、異常切断呼情報には、基地局２０から移動通信交換機３０に通知された無線回線切断理由／切断した無線回線番号／切断した時間／切断したときの通信の相手方加入者番号と、移動通信交換機３０自身が記憶している携帯移動機１０の移動機管理番号／移動機加入者番号／移動機メールアドレスとが含まれている。
【００５０】
保守情報管理装置４０の制御部４１は、受信した異常切断呼情報を異常切断呼情報記憶部４２に記録し（ステップＡ４）、さらに異常切断呼情報を異常切断呼調査装置５０に転送する（ステップＡ５）。
【００５１】
異常切断呼調査装置５０の制御部５１は、転送されてきた異常切断呼情報を異常切断呼情報記憶部５２に記録し（ステップＡ６）、異常切断呼情報の内容からアンケート調査が必要か不要かを判断する（ステップＡ７）。
【００５２】
ここで、ステップＡ７におけるアンケート調査の要否判断を制御部５１がどの様に行うかについて説明する。制御部５１は、まず異常切断呼情報に含まれる無線回線切断理由を参照し、無線回線切断理由が調査の必要な理由かどうかを判断する。無線回線切断理由とは、例えば、基地局２０から携帯移動機１０に送信した各種要求信号に対して応答が返ってこない（タイムアウト）とか、基地局２０から携帯移動機１０に送信した各種要求信号に対して正常な応答信号として期待される信号以外の信号が返ってきた（異常シーケンス）等である。携帯移動端末と基地局の間の電界強度の低下により無線回線の確立ができなくなった場合は、上記タイムアウトの切断理由となる。なお、タイムアウトの場合はアンケート調査が必要と判断され、異常シーケンスの場合はアンケート調査は不要と判断される。
【００５３】
ステップＡ７におけるアンケート調査の要否判断の結果、アンケート調査が不要となった場合は、その異常切断呼に対する調査は終了するが、アンケート調査が必要となった場合、異常切断呼調査装置５０の制御部５１はユーザ対応のアンケート帳票を生成して、生成したアンケート帳票をＵＲＬに対応付けてアンケート帳票・回答記憶部５４に格納する。このＵＲＬはユーザ毎のアンケート帳票にリンクするものであり、制御部５１が生成する（ステップＡ８）。
【００５４】
ここで、ステップＡ８におけるアンケート帳票について説明する。図４は、ユーザ対応のアンケート帳票の一例を示す図であり、アンケート内容として何が記載されているかを示している。記載内容には、まず携帯移動機加入者番号（電話番号）、異常切断呼が発生した日時（年月日、時刻）があり、これらについては制御部５１が異常切断呼情報から取得して記載する。次に、異常切断が発生した場所の大まかな地名や住所あるいは建物名等（図４では、東京都港区六本木）を予め記載しておく。ここで記載する地名や住所あるいは建物名は、基地局２０が設置されている地名や住所あるいは建物名と、異常切断呼情報に含まれる無線回線番号とをリンク付けしたものが基地局別地域名記憶部５３に予め登録されているため、制御部５１が無線回線番号を基に基地局別地域名記憶部５３から取得して、アンケート帳票に記載する。地名，住所，建物名等が予め記載されていることで、ユーザがどの通話の件を回答すればよいかを特定し易くすることが期待できる。ユーザに回答してもらう内容としては、回線が切れたときの場所（住所、交差点名、店名、地名、ビル名、イベント会場名、スポット名等）と、切れたときの状況（屋内か屋外か、移動中だったか、停止中だったか、移動手段は、電車、車、自転車、徒歩のどれなのか、電車だとしたら地下鉄、ＪＲ、私鉄なのか、車だとしたら一般道か高速道か等）であり、選択肢を回答して欲しいレベルまで詳細に設定し、さらに選択した中にも選択肢を展開させることにより、異常切断が発生した状況を詳細に把握できることが期待できる。以上のアンケート帳票は、図示しない記憶部に格納されている定型の帳票を基に、制御部５１が携帯移動機加入者番号（電話番号）、異常切断呼が発生した日時（年月日、時刻）、異常切断が発生した場所の大まかな地名や住所あるいは建物名等をユーザ対応に追加して生成する。
【００５５】
次に、制御部５１は、異常切断呼調査のためのアンケート調査依頼メールを生成し、異常切断が発生した携帯移動機１０に対してインターネット６０経由で送信する。このとき、メールアドレスは、移動通信交換機２から転送されてくる異常切断呼情報から取得する。（ステップＡ９）。
【００５６】
ここで、ステップＡ９におけるアンケート調査依頼メールについて説明する。図３は、このアンケート調査依頼メールの一例を示す図であり、メール内容として何が記載されているかを示している。記載内容は、携帯移動機加入者番号（電話番号）、異常切断呼が発生した日時（年月日、時刻）、アンケートの目的、アンケート回答のためのアクセス先（ＵＲＬ）、発信者名が例として書かれている。異常切断呼の発生した年月日、時刻とアンケート目的は、異常切断呼に関して正確な解答を得るためには重要事項である。以上のアンケート調査依頼メールは、図示しない記憶部に格納されている定型の帳票を基に、制御部５１が携帯移動機加入者番号（電話番号）、異常切断呼が発生した日時（年月日、時刻）、ＵＲＬをユーザ対応に追加して生成する。このとき、携帯移動機加入者番号（電話番号）、異常切断呼が発生した日時（年月日、時刻）については異常切断呼情報から取得し、ＵＲＬについてはステップＡ８で付したものを記載する。
【００５７】
次に、異常切断呼調査装置５０からのメールを携帯移動機１０へ着信させるため、移動通信交換機２および基地局２０は携帯移動機１０を呼び出し、応答してきた携帯移動機１０へアンケート調査依頼メールを送出する（ステップＡ１０）。
【００５８】
携帯移動機１０はアンケート調査依頼メールを受信し（ステップＡ１１）、ユーザはそのメールに記載してあるアクセス先（ＵＲＬ）にアクセスする（ステップＡ１２）。アクセス先は異常切断呼調査装置５０のサーバとなっており、アクセスを受信（ステップＡ１３）した異常切断呼調査装置５０の制御部５１は、アクセスされたＵＲＬに対応したアンケート帳票をアンケート帳票・回答記憶部５４から取得して携帯移動機１０に送出する（ステップＡ１４）。アンケート帳票を受信（ステップＡ１５）した携帯移動機１０のユーザは、アンケート帳票に記入し（ステップＡ１６）、記入されたアンケート帳票を異常切断呼調査装置５０に送出する（ステップＡ１７）。
【００５９】
回答が入力されたアンケート帳票を受信した異常切断呼調査装置５０の制御部５１は、アンケート帳票・回答記憶部５４に回答が入力されたアンケート帳票を格納し（ステップＡ１８）、アンケート帳票の回答内容を解析して（ステップＡ１９）、異常切断場所の特定および異常切断原因の推定を行う（ステップＡ２０）。
【００６０】
ここで、ステップＡ１９，Ａ２０において、異常切断調査装置５０の制御部５１がアンケート帳票回答からどの様に異常切断の発生場所を特定するのか、どの様に異常切断の原因を推定するのかの方法例を説明する。アンケート帳票にはユーザに異常切断が発生した場所を特定するための地名や住所あるいは建物名などを入力できるようにしているため、その文字を認識することにより場所を特定することが可能となる。また、異常切断が発生した原因については、発生した場所から弱電界であるかどうかがまず推測可能となる。例えば、図４に示される切断状況の回答内容において、屋内や、屋外でも地下鉄で移動中の場合等は弱電界が原因と考えられる。また、切断場所，状況からの原因推定とは別に、制御部５１はトラヒック状態や干渉波の影響、または移動によるフェージングでの一時的な弱電界の可能性についても調査を行う。これらトラヒック情報，干渉波情報，電界強度情報は、保守情報管理装置４０のトラヒック情報記憶部４３，干渉波情報記憶部４４，電界強度情報記憶部４５にそれぞれ格納されているため、制御部５１は保守情報管理装置４０にアクセスしこれらの情報を取得する。トラヒック情報については、制御部５１は異常切断呼情報の無線回線番号と切断日時を基にトラヒック情報記憶部４３を検索し、切断日時近辺における切断された無線回線の使用率等の輻輳状況を取得し、切断原因がトラヒック輻輳によるものかを判断する。また、干渉波については、制御部５１は基地局番号と切断日時を基に干渉波情報記憶部４４を検索し、該当基地局で切断日時近辺に無線回線の通信中の電界よりも強い干渉波を受けているかの情報を取得し、切断原因が干渉波によるものかを判断する。基地局番号については、基地局別地域名記憶部５３の説明の中で記載したように、無線回線番号は該当基地局番号を含んで構成されており、無線回線番号から基地局番号を取得することになる。また、電界強度情報については、制御部５１は異常切断呼情報の無線回線番号と切断日時を基に電界強度情報記憶部４５を検索し、切断日時近辺における切断された無線回線の電界強度を取得し、切断原因が弱電界によるものかを判断する。このように、異常切断が発生した場所、異常切断が発生したときの状況、異常切断が発生した時間帯でのそのエリアのトラフィック状況、干渉波の有無、電界強度等の情報を考慮し、複合的に原因を判断している。
【００６１】
ステップＡ２０で制御部５１による異常切断の場所特定および原因推定ができたら、制御部５１は異常切断呼原因解析結果記憶部５５に異常切断の推定原因や、該当ユーザのメールアドレスを登録する（ステップＡ２１）。このとき、異常切断呼情報記憶部５２の異常切断呼情報と、アンケート帳票・回答記憶部５４の異常切断呼毎のアンケート帳票と、異常切断呼原因解析結果記憶部５５の異常切断呼毎の解析結果情報においては、同じ管理案件には同じ管理番号を付してそれぞれ登録することでそれぞれの情報を関連付けて参照することが可能となる。
【００６２】
次に、保守担当者は図示しない保守担当者端末から異常切断呼調査装置５０にアクセスし、異常切断呼原因解析結果記憶部５５を参照して、必要であれば切断場所での調査を実施し、基地局２０および移動通信交換機３０に対して推定された原因への対策を実施するとともに、対策内容を異常切断呼原因解析結果記憶部５５に登録する（ステップＡ２２）。なお、保守担当者端末から異常切断呼調査装置５０にアクセスする代わりに、制御部５１が異常切断の推定原因や該当ユーザのメールアドレスを異常切断呼原因解析結果記憶部５５に登録するとともに、図示しないプリンタ等に印字出力させるようにしてもよい。
【００６３】
異常対策が実施された後、保守担当者は対策されたエリアで異常切断が発生しアンケート調査に協力していただいたユーザに対して、アンケート回答のお礼とアンケート回答結果をシステムに反映したことを報告するメールを送信する（ステップＡ２３）。メールを受け取る（ステップＡ２４）ことで、ユーザは次回のアンケート調査にも回答する動機づけになり、アンケート回答が多く集まれば集まるほどネットワーク品質の向上が期待できる。
【００６４】
なお、以上説明した本発明の一実施の形態においては、携帯移動機１０と基地局２０および移動通信交換機３０が既に通信を確立している状態で、携帯移動機１０と基地局２０間の無線回線が何らかの理由により異常切断された場合を例に説明したが、本発明はこれに限定されるものではない。これ以外の無線回線異常切断の場合、例えば、携帯移動機１０が発信した際に無線回線が確立できず通信確立に至る接続途中で異常切断となった場合や、携帯移動機１０に着信があった際に無線回線が確立できず接続途中で異常切断となった場合、携帯移動機１０と基地局２０および移動通信交換機３０が無線回線切り替えを行う際に無線回線が確立できず異常切断となった場合の、いずれの場合においても本発明が適用されることは明らかである。そして、これらの異常切断の場合にも、上記一実施の形態と同様に異常切断呼情報が保守情報管理装置４０に送信される。このとき、携帯移動機１０への着信時における異常切断の場合は、異常切断呼情報の相手方加入者番号は基地局２０から移動通信交換機３０に送られるのではなく、移動通信交換機３０で付加される点が異なる。
【００６５】
また、ステップＡ７におけるアンケート調査要否の判断において、無線回線切断理由だけで調査の要否を決定するのではなく、調査対象の切断理由に対してさらに付加条件を設定し、その付加条件にも合った場合に、アンケート調査要と判断するようにしてもよい。付加条件としては、例えば、切断した無線回線番号に偏りがあったとき、切断した時刻に偏りがあったとき、無線回線切断回数がある時間内に予め設定されたしきい値を越えたとき、通信の相手方に偏りがあったとき、特定の携帯移動機１０の無線回線切断回数がある時間内に予め設定されたしきい値を越えたとき等が考えられ、これらのいずれか一つの条件または複数の条件の組合せで判断する。なお、偏りとは、例えば特定の無線回線に切断が集中しているとか、ある時刻に切断が多いとか、特定の相手方と通信中に切断が多いとかいうことであり、一定時間内におけるこれらの具体的なしきい値については予め定めておくものとする。これらの付加条件については予め異常切断呼調査装置５０内部に設定しておく。そして、異常切断呼調査装置５０の制御部５１が異常切断呼情報を異常切断呼情報記憶部５２に蓄積しておき、一定時間毎に異常切断呼情報の付加条件対応部分を検索して条件に適合しているかどうかを判別する。例えば、切断した無線回線番号に偏りがあるか否か／切断した時刻に偏りがあるか否か／無線回線切断回数がある時間内に予め設定されたしきい値を越えたか否かについては、異常切断呼情報の無線回線番号と切断日時、通信の相手方に偏りがあるか否かについては、異常切断呼情報の相手方加入者番号、特定の携帯移動機１０の無線回線切断回数がある時間内に予め設定されたしきい値を越えたか否かについては、異常切断呼情報の移動機管理番号と切断日時、を参照して判断する。従って、切断理由だけによってアンケート調査要否を判断する場合は、切断が発生する度に一件ずつ調査要否の判断を行うが、以上の付加条件を付加してアンケート調査要否を判断する場合は、一定時間毎に過去の一定時間に蓄積された異常切断呼情報をまとめて判断する点が異なる。
【００６６】
【発明の効果】
本発明は、移動通信における異常切断発生時に携帯移動機に対して異常切断発生場所および発生状況のアンケート調査を行い、ユーザからの回答を解析することにより自動的に切断の発生場所と原因を把握することを可能にしたため、保守担当者による実地調査を削減できるとともに、迅速な原因究明が可能になるという効果がある。
【００６７】
また、切断時にユーザから具体的な発生場所や発生状況を直接入手しているため、切断原因の究明がより正確に行えるという効果がある。
【図面の簡単な説明】
【図１】本発明の一実施の形態の構成を示す図である。
【図２】本発明の一実施の形態の動作を示すフローチャートである。
【図３】ユーザへのアンケート調査依頼メールの一例を示す図である。
【図４】ユーザ対応のアンケート帳票の一例を示す図である。
【符号の説明】
１０携帯移動機
２０基地局
３０移動通信交換機
４０保守情報管理装置
４１制御部
４２異常切断呼情報記憶部
４３トラヒック情報記憶部
４４干渉波情報記憶部
４５電界強度情報記憶部
５０異常切断呼調査装置
５１制御部
５２異常切断呼情報記憶部
５３基地局別地域名記憶部
５４アンケート帳票・回答記憶部
５５異常切断呼原因解析結果記憶部
６０インターネット[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormal disconnection cause analysis system, method, abnormal disconnection call investigation device and program in mobile communication, and in particular after establishment of a radio link between a mobile mobile terminal such as a mobile phone or PHS (Personal Handyphone System) and a base station. Moves when the wireless line cannot be established for some reason and is disconnected, or when the call is disconnected during connection until the establishment of communication due to the inability to establish a wireless line when making a call, receiving a call, or switching the wireless line The present invention relates to an abnormal disconnect cause analysis system, method, abnormal disconnect call investigation device and program in communication.
[0002]
[Prior art]
In recent years, mobile communication has been widely used due to the spread of portable mobile terminals such as mobile phones. In mobile communications, radio lines are established using radio waves. Therefore, compared to communications using wired lines, wireless lines between mobile mobile terminals and base stations cannot be established or connected. Even during communication, there is a great possibility that a wireless line cannot be established and the call is disconnected when the line is disconnected. For this reason, it has become important to reduce the number of situations in which wireless communication cannot be established in mobile communication and maintain high line connection quality.
[0003]
In the mobile communication system, examples of the case where the wireless line cannot be established during communication with the other party and the line is disconnected are disclosed in, for example, Japanese Patent Laid-Open Nos. 10-190841 and 2000-184443 ( Patent Document 2). In these gazettes, when the radio line cannot be established due to a decrease in radio wave reception strength between the mobile mobile terminal and the base station, the radio line is disconnected, while receiving and storing voice messages from the other terminal, Next, it is described that when a wireless line is established, the stored voice message is transmitted to the portable mobile terminal.
[0004]
Also, conventionally, for example, when a radio link between a mobile mobile terminal and a base station occurs, the maintenance person measures the electric field strength in the service area of the radio base station, It is common practice to estimate the location and cause of a portable mobile terminal at the time of disconnection of a wireless line by conducting a telephone test while actually moving.
[0005]
[Patent Document 1]
JP-A-10-190841 (paragraphs [0011] to [0012], FIG. 1)
[Patent Document 2]
JP 2000-184443 (paragraphs [0017] to [0018], FIG. 2)
[0006]
[Problems to be solved by the invention]
However, in the invention described in Patent Document 1 or Patent Document 2 described above, although there is a description that the wireless line is disconnected due to a decrease in radio wave reception strength, there is no description regarding the investigation of the cause of the disconnection itself, It is not considered that wireless connection quality is improved by quick and accurate analysis.
[0007]
In addition, in the conventional method of estimating the location and cause of the radio line disconnection by measuring the electric field strength by the maintenance staff or conducting a field test using a telephone call test, much time and man-hours must be spent for the investigation. There is a problem that the burden on the telecommunications carrier is very large. In addition, although the location of occurrence is known to be within the service area of the corresponding radio base station by the radio base station where the radio link has been disconnected, the specific location of occurrence within the service area and the status of occurrence are identified by the maintenance personnel. Since it is left to estimation, there is also a problem that it is difficult to accurately elucidate the cause of cutting.
[0008]
It is an object of the present invention to provide an abnormal disconnect cause analysis system and method, an abnormal disconnect call investigation device, and a program for mobile communication that solve the above problems.
[0009]
[Means for Solving the Problems]
An abnormal disconnection cause analysis system in a first mobile communication according to the present invention is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, and the mobile communication switch. Causes of abnormal disconnection in mobile communication comprising a maintenance information management device, an abnormal disconnect call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected An analysis system,
Means for transmitting abnormally disconnected call information from the mobile communication switch to the abnormally disconnected call investigation device via the maintenance information management device when a radio link between the portable mobile device and the base station is abnormally disconnected; Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the abnormal disconnection call information, and when the abnormal disconnection call survey device is a reason for disconnection requiring a questionnaire survey, Means for transmitting a survey request mail to the portable mobile device; means for accessing the abnormal disconnect call investigation device as an access destination described in the questionnaire survey request mail by the portable mobile device; and the abnormal disconnection accessed. A means for transmitting a questionnaire form screen information to the portable mobile device by a call investigation device, and a user inputting a questionnaire response content on the screen of the portable mobile device Means for transmitting, the abnormal disconnection call survey apparatus that has received a questionnaire answer, and means for performing an analysis of a specific and causes of occurrence location of abnormal disconnection based on a questionnaire answer content.
[0010]
An abnormal disconnection cause analysis system in a second mobile communication according to the present invention is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, and the mobile communication switch. Causes of abnormal disconnection in mobile communication comprising a maintenance information management device, an abnormal disconnect call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected An analysis system,
The maintenance information management device receives and accumulates traffic information indicating the usage status of a radio channel periodically transmitted from the mobile communication switch, interference wave information in each base station, and field strength information for each radio channel. And when the radio link between the portable mobile device and the base station is abnormally disconnected, the mobile communication exchange transmits abnormally disconnected call information to the abnormally disconnected call investigation device via the maintenance information management device. Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the abnormal disconnect call information, and the abnormal disconnect call survey when the survey is a disconnect reason requiring the survey Means for transmitting a questionnaire survey request mail to the portable mobile device; and the abnormal disconnection wherein the portable mobile device is the access destination described in the questionnaire request email Means for accessing the call investigation device; means for the accessed abnormally disconnected call investigation device to send questionnaire form screen information to the portable mobile device; and the user inputs the contents of the questionnaire response on the screen of the portable mobile device. Means for transmitting, means for identifying the abnormal disconnection call investigation device receiving the questionnaire response, identifying the location of occurrence of abnormal disconnection based on the content of the questionnaire response, and means for identifying the location of the abnormal disconnection call and the maintenance Means for analyzing a cause of disconnection with reference to traffic information, interference wave information, and electric field strength information stored in the information management device.
[0011]
An abnormal disconnection cause analysis system in a third mobile communication according to the present invention is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, and the mobile communication switch. Causes of abnormal disconnection in mobile communication comprising a maintenance information management device, an abnormal disconnect call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected An analysis system,
Means for transmitting abnormally disconnected call information from the mobile communication switch to the abnormally disconnected call investigation device via the maintenance information management device every time a radio link between the portable mobile device and the base station is abnormally disconnected; Means for accumulating abnormally disconnected call information received by the abnormally disconnected call investigating device; Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the information and preset additional conditions, and when it is determined that a questionnaire survey is necessary, the abnormal disconnect call survey device sends a questionnaire survey request mail Means for transmitting to a mobile device; means for accessing the abnormally disconnected call investigation device, which is the access destination described in the questionnaire request email, by the portable mobile device; The accessed abnormal disconnected call investigation device transmits means for transmitting questionnaire form screen information to the portable mobile device, means for the user to input and send questionnaire response contents on the screen of the portable mobile device, and receives the questionnaire response The abnormal disconnect call investigation device has means for identifying the location of the abnormal disconnect and analyzing the cause based on the contents of the questionnaire response.
[0012]
According to a fourth aspect of the present invention, there is provided an abnormal disconnection cause analysis system connected to a portable mobile device, a base station connected to the portable mobile device via a radio line, a mobile communication switch, and the mobile communication switch. Causes of abnormal disconnection in mobile communication comprising a maintenance information management device, an abnormal disconnect call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected An analysis system,
The maintenance information management device receives and accumulates traffic information indicating the usage status of a radio channel periodically transmitted from the mobile communication switch, interference wave information in each base station, and field strength information for each radio channel. Each time the radio link between the mobile station and the base station is abnormally disconnected, the mobile communication switch sends the abnormally disconnected call information to the abnormally disconnected call investigation device via the maintenance information management device. Means for storing abnormally disconnected call information received by the abnormally disconnected call investigation device, and for abnormally disconnected call information accumulated by the abnormally disconnected call investigating device for a certain period of time in the past. Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the abnormally disconnected call information and preset additional conditions, and when it is determined that a questionnaire survey is necessary, the abnormally disconnected call Means for transmitting a questionnaire survey request mail to the corresponding portable mobile device, and means for accessing the abnormal disconnect call investigation device that is the access destination described in the questionnaire survey request mail. The abnormal disconnect call investigation device transmits a questionnaire form screen information to the portable mobile device, a means for a user to input and send a questionnaire response content on the screen of the portable mobile device, and the questionnaire response received The abnormal disconnection call investigation device identifies the location of occurrence of abnormal disconnection based on the questionnaire response content, and the abnormal disconnection call investigation device includes the questionnaire response content and the traffic information stored in the maintenance information management device, interference Means for analyzing the cause of cutting with reference to wave information and electric field strength information.
[0013]
An abnormal disconnection cause analysis system in a fifth mobile communication of the present invention is the abnormal disconnection cause analysis system in the third or fourth mobile communication of the present invention, wherein the additional condition is biased in a disconnected wireless line number That there is a bias in the disconnection time, that the number of disconnections of the radio line has exceeded a preset threshold within a certain time, that there is a bias in the other party of communication, and that the radio channel of a specific portable mobile device Cutting Times One of the conditions or a combination of a plurality of conditions is applied, including exceeding a preset threshold value within a certain period of time.
[0014]
The abnormal disconnection cause analysis system in the sixth mobile communication of the present invention is the abnormal disconnection cause analysis system in any of the first to fifth mobile communications of the present invention, wherein the abnormal disconnect call information includes a reason for disconnecting a radio line, Includes disconnected wireless line number, date and time of disconnection, communication partner number for communication when disconnected, mobile device management number of mobile device that has been abnormally disconnected, mobile device subscriber number, mobile device mail address And
[0015]
The abnormal disconnection cause analysis system in the seventh mobile communication of the present invention is the abnormal disconnection cause analysis system in any of the first to sixth mobile communication of the present invention, wherein the contents of the questionnaire response are the location when disconnected, indoor Or Outdoor Or ,During the move It was Stopping It was ,transportation At least one of It is characterized by including.
[0016]
According to an eighth aspect of the present invention, there is provided an abnormal disconnection cause analysis system in an abnormal disconnection cause analysis system in any one of the first to seventh mobile communications according to the present invention, wherein the questionnaire form is generated for each user. And the area name of the area covered by the base station where the disconnection occurred is described in advance and transmitted to the portable mobile device.
[0017]
A ninth aspect of the abnormal disconnection cause analysis system in mobile communication of the present invention is the abnormal disconnection cause analysis system in any one of the first to eighth mobile communications of the present invention, wherein the wireless line between the portable mobile device and the base station The abnormal disconnection is a disconnection of the wireless line due to a cause other than when the calling user or the receiving user voluntarily ends the call due to the end of the communication. If the wireless line cannot be established and is disconnected during connection until the communication is established, the wireless line cannot be established when an incoming call is received to the portable mobile device. When performing, it is characterized by including a case where the wireless line cannot be established and is disconnected.
[0018]
A first abnormal disconnect call investigation device according to the present invention includes a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, and a maintenance information management connected to the mobile communication switch. An abnormally disconnected call investigation device in a system comprising an apparatus, an abnormally disconnected call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormally disconnected call investigation device are connected. And
Means for receiving abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device; means for determining whether or not a questionnaire is necessary based on the reason for disconnection included in the received abnormally disconnected call information; Means for sending a questionnaire survey request email to the portable mobile device, means for sending questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, and It has means for receiving the contents of the questionnaire response sent from the portable mobile device, and means for identifying the location of occurrence of abnormal disconnection and analyzing the cause based on the contents of the questionnaire response.
[0019]
A second abnormal call disconnection investigation device according to the present invention includes a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, and maintenance information management connected to the mobile communication switch. An abnormally disconnected call investigation device in a system comprising an apparatus, an abnormally disconnected call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormally disconnected call investigation device are connected. And
Means for receiving abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device; means for determining whether or not a questionnaire is necessary based on the reason for disconnection included in the received abnormally disconnected call information; Means for sending a questionnaire survey request email to the portable mobile device, means for sending questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, and Means for receiving the contents of the questionnaire response sent from the portable mobile device, means for identifying the location where the abnormal disconnection occurred based on the contents of the questionnaire response, the contents of the questionnaire response and the traffic information stored in the maintenance information management device, Means for analyzing the cause of cutting with reference to interference wave information and electric field strength information.
[0020]
A third abnormal disconnect call investigation device according to the present invention includes a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, and a maintenance information management connected to the mobile communication switch. An abnormally disconnected call investigation device in a system comprising an apparatus, an abnormally disconnected call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormally disconnected call investigation device are connected. And
The means for receiving and storing abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device, and the abnormally disconnected call information stored for a certain period of time in the past for a certain period of time A means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the call information and preset additional conditions, and a means for transmitting a questionnaire survey request mail to the corresponding portable mobile device when a questionnaire survey is determined to be necessary Means for transmitting questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, means for receiving the questionnaire response content sent from the portable mobile device, and abnormal disconnection based on the questionnaire response content Means for identifying the occurrence location and analyzing the cause.
[0021]
A fourth abnormal disconnect call investigation device according to the present invention includes a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, and maintenance information management connected to the mobile communication switch. An abnormally disconnected call investigation device in a system comprising an apparatus, an abnormally disconnected call investigation device connected to the maintenance information management device, and the Internet to which the mobile communication switch and the abnormally disconnected call investigation device are connected. And
The means for receiving and storing abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device, and the abnormally disconnected call information stored for a certain period of time in the past for a certain period of time A means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the call information and preset additional conditions, and a means for transmitting a questionnaire survey request mail to the corresponding portable mobile device when a questionnaire survey is determined to be necessary Means for transmitting questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, means for receiving the questionnaire response content sent from the portable mobile device, and abnormal disconnection based on the questionnaire response content For identifying the location where the problem occurred, questionnaire response contents, traffic information and interference wave information stored in the maintenance information management device And means for analyzing cutting cause by referring to field strength information.
[0022]
According to a fifth abnormal disconnection call investigation device of the present invention, in the third or fourth abnormal disconnection call investigation device of the present invention, the additional condition is that the disconnected wireless line number is biased and the time of disconnection is biased. That the number of times the wireless line is disconnected exceeds a preset threshold within a certain period of time, the communication partner is biased, and the wireless line of a specific portable mobile device is disconnected Times One of the conditions or a combination of a plurality of conditions is applied, including exceeding a preset threshold value within a certain period of time.
[0023]
The sixth abnormal disconnect call investigation device of the present invention is the abnormal disconnect call investigation device of any one of the first to fifth of the present invention, wherein the abnormal disconnect call information includes a wireless line disconnect reason, a disconnected wireless line number, It includes the date and time of disconnection, the other party subscriber number of communication at the time of disconnection, the mobile unit management number of the mobile mobile unit that has been abnormally disconnected, the mobile unit subscriber number, and the mobile unit mail address.
[0024]
A seventh abnormally disconnected call investigation device according to the present invention is the abnormally disconnected call investigation device according to any one of the first to sixth aspects of the present invention, wherein the contents of the questionnaire response are: Or Outdoor Or ,During the move It was Stopping It was ,transportation At least one of It is characterized by including.
[0025]
The eighth abnormal disconnect call investigation device of the present invention is the abnormal disconnect call investigation device according to any one of the first to seventh of the present invention, wherein the questionnaire form is generated for each user, the disconnection date and time and the disconnection base An area name of an area covered by the station is described in advance and transmitted to the portable mobile device.
[0026]
The first abnormal disconnect cause analysis method of the present invention is an abnormal disconnect cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a portable mobile device and a base station. Transmitted from the exchange to the abnormal disconnect call investigation device, the abnormal disconnect call investigation device determines whether or not a cause analysis investigation is necessary according to the reason for disconnection included in the abnormal disconnect call information, and if the investigation is necessary, the portable mobile device A questionnaire survey is requested, and the cause of abnormal disconnection is analyzed according to the contents of the received questionnaire response.
[0027]
A second abnormal disconnection cause analysis method of the present invention is an abnormal disconnect cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a portable mobile device and a base station. Transmitted from the exchange to the abnormal disconnect call investigation device, the abnormal disconnect call investigation device determines whether or not a cause analysis investigation is necessary according to the reason for disconnection included in the abnormal disconnect call information, and if the investigation is necessary, the portable mobile device It is characterized by requesting a questionnaire survey and analyzing the cause of abnormal disconnection by referring to the contents of the questionnaire responses received and the traffic information, interference wave information, and electric field strength information of each base station acquired from an external maintenance information management device To do.
[0028]
The third abnormal disconnection cause analysis method of the present invention is an abnormal disconnection cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a mobile mobile device and a base station. Is transmitted from the mobile communication switch to the abnormal disconnect call investigation device, the abnormal disconnect call investigation device accumulates the abnormal disconnect call information, and targets abnormal disconnect call information stored in the past fixed time every fixed time, The reason for disconnection included in the abnormal disconnect call information and the necessity condition investigation investigation are determined based on preset additional conditions, and when the investigation is necessary, the portable mobile device is requested to conduct a questionnaire investigation, and the received questionnaire response content It is characterized by analyzing the cause of abnormal cutting.
[0029]
The fourth abnormal disconnection cause analysis method of the present invention is an abnormal disconnection cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a mobile mobile device and a base station, and abnormal disconnection call information every time an abnormal disconnection occurs. Is transmitted from the mobile communication switch to the abnormal disconnect call investigation device, the abnormal disconnect call investigation device accumulates the abnormal disconnect call information, and targets abnormal disconnect call information stored in the past fixed time every fixed time, The reason for disconnection included in the abnormal disconnect call information and the necessity condition investigation investigation are determined based on preset additional conditions, and when the investigation is necessary, the portable mobile device is requested to conduct a questionnaire investigation, and the received questionnaire response content In addition, the cause of abnormal disconnection is analyzed with reference to traffic information, interference wave information, and electric field strength information of each base station acquired from an external maintenance information management device.
[0030]
The program of the present invention causes a computer to function as any one of the first to eighth abnormal disconnect call investigation devices of the present invention.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings.
[0032]
FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, in which a portable mobile device 10, a base station 20, a mobile communication switch 30, a maintenance information management device 40, an abnormally disconnected call investigation device 50, And the Internet 60. The mobile mobile device 10 and the base station 20 establish communication via a wireless line, and communicate with the other party via the mobile communication switch 30. The mobile communication switch 30 is connected to the Internet 60. Further, the mobile communication switch 30 and the maintenance information management device 40 are connected, and the maintenance information management device 40 and the abnormal disconnect call investigation device 50 are further connected. The abnormal call disconnection investigation device 50 is also connected to the Internet 60.
[0033]
The portable mobile device 10 is a portable mobile terminal such as a cellular phone or PHS, and has a function of transmitting / receiving mail and a browser function of connecting to the Internet 60 and transmitting / receiving WEB information.
[0034]
The base station 20 has a function for establishing a wireless line with the portable mobile device 10, a function for maintaining a wireless line after establishing the wireless line, a function for disconnecting the wireless line, and a disconnection when disconnecting the wireless line A function for determining the reason and a function for notifying the mobile communication switch 30 of the reason for disconnection / disconnected wireless line number / disconnected date / time / disconnected subscriber number (telephone number) when disconnected Traffic information indicating the channel usage status such as the usage rate of the radio channel / interference wave information when receiving an interference wave stronger than the electric field of the radio channel in communication / field strength information for each radio channel in communication And a function of constantly measuring and notifying the mobile communication switching system 30. The traffic information / electric field strength information for each wireless line in communication may be periodically notified to the mobile communication switch 30 or may be constantly notified. The interference wave information may be notified periodically or at the time of occurrence. Further, the traffic information / interference wave information / field strength information is notified in association with the measurement date.
[0035]
The mobile communication switch 30 includes a function for establishing communication after the portable mobile station 10 and the base station 20 establish a wireless line, a function for maintaining communication, a function for disconnecting communication, and a reason for disconnection when disconnecting communication. , A function for managing the position of the portable mobile device 10, a function for calling the portable mobile device 10, a reason for disconnecting the wireless channel notified from the base station 20 when the wireless channel is abnormally disconnected / a disconnected wireless channel number / Date and time of disconnection / other party subscriber number of communication at the time of disconnection and mobile station management number (identifier unique to mobile station) of mobile mobile station 10 stored in mobile communication switch 30 itself / mobile station subscriber number (telephone) Number) / mobile device mail address as abnormally disconnected call information to the maintenance information management device 40, traffic information / interference wave information periodically transmitted from the base station 20 / wireless times during communication A function for notifying the maintenance information management device 40 of the electric field strength information for each, a function for receiving an e-mail to the portable mobile device 10 sent via the Internet, and a portable mobile device 10 and the Internet 60 And a function of establishing a line for connecting.
[0036]
The maintenance information management device 40 is an information processing device such as a server, and the operation is controlled by a program stored in a storage unit (not shown), an abnormally disconnected call information storage unit 42, and a traffic information storage unit 43. And an interference wave information storage unit 44 and an electric field strength information storage unit 45.
[0037]
The control unit 41 sends the abnormally disconnected call information (radio line disconnect reason / disconnected wireless line number / disconnected date / time / disconnected partner number of communication at disconnection / abnormal disconnection) notified from the mobile communication switch 30. The mobile mobile device 10 mobile device management number / mobile device subscriber number / mobile device mail address) stored in the abnormal call disconnect information storage unit 42 and transferred to the abnormal call disconnect investigation device 50; Traffic information / interference wave information / field strength information for each wireless channel being communicated notified from the station 20 via the mobile communication switching system 30, traffic information storage unit 43, interference wave information storage unit 44, field strength information storage unit 45 and the information stored in the abnormal disconnection call investigation device 50 when there is a request for reference to traffic information / interference wave information / field strength information. It has a function and that.
[0038]
The abnormally disconnected call information storage unit 42 stores abnormally disconnected call information (radio line disconnection reason / disconnected wireless line number / disconnected date / time / communication at disconnection) notified from the mobile communication switching system 30 every time an abnormal disconnection occurs. The other party subscriber number / the mobile device management number / mobile device subscriber number / mobile device mail address of the portable mobile device 10 that has been abnormally disconnected is stored.
[0039]
In the traffic information storage unit 43, traffic information indicating the channel usage status such as the usage rate of the radio channel of each base station 20 notified through the mobile communication switch 30 is stored together with the measurement date and time. Based on this traffic information, the abnormal call disconnection investigation device 50 determines the congestion state of the radio line of each base station 20 at the designated date and time.
[0040]
The interference wave information storage unit 44 stores interference wave information (interference wave level and generation date / time) stronger than the electric field of the radio channel in communication of each base station 20 notified via the mobile communication switch 30. . Based on the interference wave information, the abnormal call disconnection investigation device 50 determines whether or not there is an interference wave of each base station 20 at the designated date and time.
[0041]
The field strength information storage unit 45 stores the field strength information for each wireless channel in communication with each base station 20 notified via the mobile communication switch 30 together with the measurement date and time. Based on this electric field strength information, the abnormal call disconnection investigation device 50 determines the change in the electric field strength at the designated wireless line and at the designated date and time.
[0042]
The abnormally disconnected call investigation device 50 is an information processing device such as a server. The control unit 51, the operation of which is controlled by a program stored in a storage unit (not shown), the abnormally disconnected call information storage unit 52, and the area for each base station A name storage unit 53, a questionnaire form / answer storage unit 54, and an abnormal disconnect call cause analysis result storage unit 55 are provided.
[0043]
The control unit 51 receives the abnormally disconnected call information transferred from the maintenance information management device 40 and stores the abnormally disconnected call information in the abnormally disconnected call information storage unit 52, and a questionnaire survey from the abnormally disconnected call information to the user of the portable mobile device 10. A function for determining whether or not a survey is necessary, a function for generating a survey request mail to the user and transmitting it via the Internet 60 when it is determined that a survey for the user is necessary, and an access related to a survey from the user A function to receive, a function to send a questionnaire form that can be easily answered by the user based on abnormal disconnect call information, and a function to receive a questionnaire form answer from the user, and a questionnaire answer Function to analyze the contents and identify the location of abnormally disconnected calls, and questionnaire response contents And the ability to estimate the cause of the analysis abnormally disconnected the call, to generate the e-mail of thanks and abnormal cutting measures implemented reporting of survey responses cooperation to the user and a function to transmit over the Internet 60.
[0044]
The abnormally disconnected call information storage unit 52 stores the abnormally disconnected call information transferred from the maintenance information management device 40. In the area name storage unit 53 for each base station, the area name (for example, address) of the area covered by each base station is registered in advance corresponding to the wireless line number. Alternatively, the area name where each base station is installed may be registered. The radio channel number includes the corresponding base station number, and the base station can be specified from the radio channel number. In the questionnaire form / answer storage part 54, the control part 51 stores the questionnaire form corresponding to the user and the contents of the questionnaire answer corresponding to the URL (Uniform Resource Locator) for each user. The abnormal disconnection call cause analysis result storage unit 55 stores the cause of the abnormal disconnection analyzed by the control unit 51 based on the contents of the questionnaire response, the countermeasures taken separately by the maintenance staff, and the email address of the report target user. Is done.
[0045]
Next, the operation of the embodiment of the present invention will be described with reference to FIGS.
[0046]
FIG. 2 is a flowchart showing the operation of the embodiment of the present invention. In the state in which the portable mobile device 10, the base station 20, and the mobile communication switch 30 have already established communication, the portable mobile device 10 and the base station The operation when the radio link between 20 is abnormally disconnected for some reason is shown.
[0047]
Here, abnormal disconnection is disconnection of the line due to a cause other than when the calling user or the receiving user voluntarily ends the call after the communication ends, and in the present invention, the mobile mobile device 10 and the base station It is intended for disconnection between 20 wireless lines. For example, after establishment of a wireless line between the portable mobile device 10 and the base station 20, the wireless line cannot be established for some reason and is disconnected, or due to the inability to establish a wireless line when making a call, receiving a call, or switching the wireless line This includes the case where the call is disconnected during the connection leading to the establishment of communication.
[0048]
FIG. 3 is a diagram showing an example of a questionnaire survey request mail to the user, and FIG. 4 is a diagram showing an example of a questionnaire report corresponding to the user.
[0049]
Referring to FIG. 2, in a state where the mobile mobile device 10, the base station 20, and the mobile communication switch 30 have already established communication (step A <b> 1), the base station 20 communicates with the wireless channel between the mobile mobile device 10 and the base station 20. When the abnormal disconnection is detected (step A2), the base station 20 sends the reason for disconnecting the wireless line / the disconnected wireless line number / the date and time of the disconnected / subscriber's subscriber number for the communication when disconnected, to the mobile communication switch 30. The mobile communication switching unit 30 that has received the mobile unit 10 stores an abnormally disconnected call together with the mobile unit management number (identifier unique to the mobile unit) / mobile unit subscriber number (telephone number) / mobile unit mail address stored in the mobile unit 10 itself. Information is transferred to the maintenance information management device 40 (step A3). That is, the abnormally disconnected call information includes the reason for disconnecting the wireless line notified from the base station 20 to the mobile communication switch 30, the disconnected wireless line number, the disconnected time, the partner number for communication when disconnected, and the mobile communication. The mobile station management number / mobile station subscriber number / mobile station mail address of the portable mobile station 10 stored in the exchange 30 itself is included.
[0050]
The control unit 41 of the maintenance information management device 40 records the received abnormally disconnected call information in the abnormally disconnected call information storage unit 42 (step A4), and further transfers the abnormally disconnected call information to the abnormally disconnected call investigation device 50 (step). A5).
[0051]
The control unit 51 of the abnormally disconnected call investigation device 50 records the transferred abnormally disconnected call information in the abnormally disconnected call information storage unit 52 (step A6), and whether or not a questionnaire survey is necessary from the content of the abnormally disconnected call information. Is determined (step A7).
[0052]
Here, how the control unit 51 determines whether or not the questionnaire survey is necessary in step A7 will be described. First, the control unit 51 refers to the reason for disconnecting the wireless line included in the abnormally disconnected call information, and determines whether the reason for disconnecting the wireless line is a reason for investigation. The reason for disconnecting the wireless line is, for example, that no response is returned to the various request signals transmitted from the base station 20 to the portable mobile device 10 (timeout), or various request signals transmitted from the base station 20 to the portable mobile device 10. For example, a signal other than a signal expected as a normal response signal is returned (abnormal sequence). If the wireless line cannot be established due to a decrease in electric field strength between the portable mobile terminal and the base station, this is the reason for disconnecting the timeout. In the case of timeout, it is determined that a questionnaire survey is necessary, and in the case of an abnormal sequence, it is determined that the questionnaire survey is unnecessary.
[0053]
As a result of determining whether or not the questionnaire survey is necessary in step A7, when the questionnaire survey is unnecessary, the survey for the abnormally disconnected call ends. However, when the questionnaire survey is necessary, the control of the abnormally disconnected call survey device 50 is performed. The unit 51 generates a questionnaire form corresponding to the user, and stores the generated questionnaire form in the questionnaire form / answer storage unit 54 in association with the URL. This URL is linked to the questionnaire form for each user, and is generated by the control unit 51 (step A8).
[0054]
Here, the questionnaire form in step A8 will be described. FIG. 4 is a view showing an example of a questionnaire form corresponding to the user, and shows what is written as the contents of the questionnaire. The description includes the mobile mobile subscriber number (telephone number) and the date and time (year / month / day / time) when the abnormally disconnected call occurred. These are acquired by the control unit 51 from the abnormally disconnected call information. To do. Next, a rough place name, address, building name or the like (in FIG. 4, Roppongi, Tokyo) is described in advance. The place name, address, or building name described here is a name obtained by linking the place name, address, or building name where the base station 20 is installed with the wireless line number included in the abnormally disconnected call information. Since it is registered in the storage unit 53 in advance, the control unit 51 acquires it from the area name storage unit 53 for each base station based on the wireless line number and writes it in the questionnaire form. Since the place name, address, building name, and the like are described in advance, it can be expected that the user can easily specify which call should be answered. The contents to be answered by the user include the location when the line is disconnected (address, intersection name, store name, place name, building name, event venue name, spot name, etc.) and the situation when the line is disconnected (indoor or outdoor) , Whether it was moving, was stopped, whether it was a train, car, bicycle, walking, subway, JR, private railway if it was a train, whether it was a car or a highway It can be expected that the situation where the abnormal disconnection has occurred can be grasped in detail by setting the options to the level at which the options are desired to be answered in detail and further expanding the options within the selection. The above questionnaire forms are based on a standard form stored in a storage unit (not shown), and the control unit 51 has a mobile phone subscriber number (telephone number) and the date and time (year / month / day, time) when the abnormal disconnect call occurred. ), A rough place name, address or building name of the place where the abnormal disconnection occurs is added to the user and generated.
[0055]
Next, the control unit 51 generates a questionnaire survey request mail for investigating abnormally disconnected calls, and transmits it via the Internet 60 to the portable mobile device 10 where the abnormal disconnection has occurred. At this time, the e-mail address is acquired from the abnormally disconnected call information transferred from the mobile communication switch 2. (Step A9).
[0056]
Here, the questionnaire survey request mail in step A9 will be described. FIG. 3 is a diagram showing an example of this questionnaire survey request mail, and shows what is written as the mail contents. Examples of the contents include mobile phone subscriber number (telephone number), date and time (year / month / day, time) when abnormal disconnect call occurred, purpose of questionnaire, access destination (URL) for answering questionnaire, and caller name It is written as. The date and time when the abnormally disconnected call occurred and the purpose of the questionnaire are important for obtaining an accurate answer regarding the abnormally disconnected call. The above questionnaire survey request e-mail is based on a standard form stored in a storage unit (not shown), and the control unit 51 has a mobile phone subscriber number (telephone number) and the date and time (year / month / day) when the abnormal disconnect call occurred. , Time) and URL are added and generated for each user. At this time, the mobile phone subscriber number (telephone number) and the date and time (year / month / day, time) when the abnormally disconnected call is obtained are obtained from the abnormally disconnected call information, and the URL attached in step A8 is described. .
[0057]
Next, in order to receive the mail from the abnormal call disconnection investigation device 50 to the portable mobile device 10, the mobile communication switch 2 and the base station 20 call the portable mobile device 10 and send the questionnaire survey request mail to the portable mobile device 10 that has responded. Is sent out (step A10).
[0058]
The portable mobile device 10 receives the questionnaire survey request mail (step A11), and the user accesses the access destination (URL) described in the mail (step A12). The access destination is the server of the abnormally disconnected call investigation device 50, and the control unit 51 of the abnormally disconnected call investigation device 50 that has received the access (step A13) displays the questionnaire form corresponding to the accessed URL as the questionnaire form / answer Obtained from the storage unit 54 and sent to the portable mobile device 10 (step A14). The user of the portable mobile device 10 that has received the questionnaire form (step A15) fills in the questionnaire form (step A16), and sends the filled-out questionnaire form to the abnormal disconnect call investigation device 50 (step A17).
[0059]
The control unit 51 of the abnormal disconnection call investigation device 50 that has received the questionnaire form in which the answer has been entered stores the questionnaire form in which the answer has been entered in the questionnaire form / answer storage unit 54 (step A18), and the contents of the answer in the questionnaire form Is analyzed (step A19), and the location of the abnormal cutting is specified and the cause of the abnormal cutting is estimated (step A20).
[0060]
Here, in steps A19 and A20, an example of how the control unit 51 of the abnormal cutting investigation device 50 identifies the location of the abnormal cutting from the answer to the questionnaire report and how to estimate the cause of the abnormal cutting Will be explained. Since a place name, an address, a building name, or the like for specifying a place where an abnormal disconnection has occurred can be input to the questionnaire form, the place can be specified by recognizing the characters. In addition, as to the cause of the abnormal cutting, it can be first estimated whether the electric field is a weak electric field from the place where the abnormal cutting occurred. For example, in the answer contents of the cutting situation shown in FIG. 4, it is considered that the weak electric field is the cause when the user is moving indoors or outdoors by subway. In addition to the cause estimation from the cutting location and situation, the control unit 51 also investigates the possibility of a temporary weak electric field due to the influence of traffic state or interference wave, or fading due to movement. Since these traffic information, interference wave information, and electric field strength information are respectively stored in the traffic information storage unit 43, the interference wave information storage unit 44, and the electric field strength information storage unit 45 of the maintenance information management device 40, the control unit 51 The maintenance information management device 40 is accessed to acquire such information. For traffic information, the control unit 51 searches the traffic information storage unit 43 based on the radio line number of the abnormally disconnected call information and the disconnection date and time, and acquires the congestion status such as the usage rate of the disconnected radio line near the disconnection date and time. It is then determined whether the cause of the disconnection is due to traffic congestion. As for the interference wave, the control unit 51 searches the interference wave information storage unit 44 based on the base station number and the cutting date and time, and the interference wave stronger than the electric field in communication on the wireless line near the cutting date and time at the base station. To determine whether the cause of the disconnection is due to an interference wave. As for the base station number, as described in the explanation of the area name storage unit 53 for each base station, the radio channel number includes the corresponding base station number, and the base station number is obtained from the radio channel number. It will be. As for the field strength information, the control unit 51 searches the field strength information storage unit 45 based on the wireless line number of the abnormally disconnected call information and the disconnection date and time, and acquires the electric field strength of the disconnected radio line near the disconnection date and time. Then, it is determined whether the cause of cutting is due to a weak electric field. In this way, considering the location of the abnormal disconnection, the situation when the abnormal disconnection occurred, the traffic status of the area in the time zone when the abnormal disconnection occurred, the presence of interference waves, the electric field strength, etc. The cause is determined.
[0061]
When the location of abnormal disconnection and the cause estimation by the control unit 51 are completed in step A20, the control unit 51 registers the cause of abnormal disconnection and the mail address of the user in the abnormal disconnect call cause analysis result storage unit 55 (step S20). A21). At this time, abnormally disconnected call information in the abnormally disconnected call information storage unit 52, a questionnaire form for each abnormally disconnected call in the questionnaire form / answer storage unit 54, and an analysis for each abnormally disconnected call in the abnormally disconnected call cause analysis result storage unit 55 In the result information, it is possible to refer to each piece of information in association with each other by registering the same management case with the same management number.
[0062]
Next, the maintenance person accesses the abnormal disconnect call investigation device 50 from a maintenance person terminal (not shown), refers to the abnormal disconnect call cause analysis result storage unit 55, and conducts an investigation at the disconnection place if necessary. Then, the countermeasure for the cause estimated for the base station 20 and the mobile communication switch 30 is implemented, and the contents of the countermeasure are registered in the abnormal disconnect call cause analysis result storage unit 55 (step A22). Instead of accessing the abnormal disconnect call investigation device 50 from the maintenance staff terminal, the control unit 51 registers the estimated cause of abnormal disconnection and the mail address of the user in the abnormal disconnect call cause analysis result storage unit 55, as shown in FIG. You may make it print out to the printer etc. which do not.
[0063]
After the countermeasures were taken, the maintenance staff reflected that the system responded to the questionnaire response and the questionnaire response results for users who had an abnormal disconnection in the area where the countermeasure was taken and cooperated in the survey. A report mail is transmitted (step A23). By receiving the mail (step A24), the user is motivated to answer the next questionnaire survey, and the more questionnaire answers are collected, the better the network quality can be expected.
[0064]
In the embodiment of the present invention described above, the wireless communication between the portable mobile device 10 and the base station 20 in a state where the portable mobile device 10, the base station 20, and the mobile communication switch 30 have already established communication. Although the case where the line is abnormally disconnected for some reason has been described as an example, the present invention is not limited to this. In the case of other abnormal disconnection of the wireless line, for example, when the mobile mobile device 10 makes a call, the wireless line cannot be established and an abnormal disconnection occurs during the connection leading to the establishment of communication, or the mobile mobile device 10 receives an incoming call. If a wireless line cannot be established and an abnormal disconnection occurs during connection, the mobile line 10, the base station 20, and the mobile communication switching unit 30 are unable to establish a wireless line and switch abnormally. Obviously, the present invention is applicable to any case. Even in the case of these abnormal disconnections, the abnormal disconnect call information is transmitted to the maintenance information management device 40 as in the above-described embodiment. At this time, in the case of abnormal disconnection at the time of incoming call to the portable mobile device 10, the partner subscriber number of the abnormally disconnected call information is not sent from the base station 20 to the mobile communication switch 30, but is added by the mobile communication switch 30. Is different.
[0065]
In addition, in the determination of whether or not the questionnaire survey is necessary in step A7, an additional condition is set for the reason for disconnection of the survey target, instead of deciding whether or not the survey is necessary based only on the reason for disconnecting the wireless line. If they match, it may be determined that a questionnaire survey is necessary. As an additional condition, for example, when there is a bias in the disconnected wireless line number, when there is a bias in the disconnected time, when a predetermined threshold is exceeded within a certain time, When there is a bias in the other party of communication, the wireless line disconnection of a specific portable mobile device 10 Times A case where a preset threshold value is exceeded within a certain period of time can be considered, and a determination is made based on any one of these conditions or a combination of a plurality of conditions. Note that the bias means that, for example, disconnection is concentrated on a specific wireless line, disconnection is frequent at a certain time, or disconnection is frequent during communication with a specific partner, and these specifics within a certain period of time. A typical threshold value is determined in advance. These additional conditions are set in advance within the abnormal disconnect call investigation device 50. Then, the control unit 51 of the abnormally disconnected call investigation device 50 stores the abnormally disconnected call information in the abnormally disconnected call information storage unit 52, and searches for an additional condition corresponding part of the abnormally disconnected call information every predetermined time. Determine if it is compatible. For example, whether the disconnected wireless line number is biased / Off Whether there is a bias in the disconnected time / whether the number of times of disconnection of the radio line has exceeded a preset threshold value within a certain time, the radio line number of the abnormally disconnected call information, the date and time of disconnection, and the communication partner As for whether or not there is a bias, the other party subscriber number of the abnormally disconnected call information, the wireless line disconnection of the specific mobile mobile device 10 Times Whether or not a preset threshold value has been exceeded within a certain period of time is determined with reference to the mobile station management number and disconnection date / time of the abnormal disconnect call information. Therefore, when judging whether or not a questionnaire survey is necessary based only on the reason for disconnection, each time a disconnection occurs, the survey necessity is determined one by one, but when the above additional conditions are added to determine whether a questionnaire survey is necessary or not Is different from the above in that abnormally disconnected call information accumulated during a certain past time is collectively judged every certain time.
[0066]
【The invention's effect】
The present invention conducts a questionnaire survey of the location and status of abnormal disconnection for portable mobile devices when abnormal disconnection occurs in mobile communications, and automatically understands the location and cause of disconnection by analyzing the responses from the user. As a result, it is possible to reduce the on-site investigation by the maintenance staff and to quickly find the cause.
[0067]
Further, since the specific location and situation of occurrence are directly obtained from the user at the time of cutting, there is an effect that the cause of the cutting can be investigated more accurately.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.
FIG. 3 is a diagram showing an example of a questionnaire survey request mail to a user.
FIG. 4 is a diagram showing an example of a questionnaire form corresponding to a user.
[Explanation of symbols]
10 Mobile mobile devices
20 base stations
30 Mobile communication switch
40 Maintenance information management device
41 Control unit
42 Abnormally disconnected call information storage unit
43 Traffic information storage
44 Interference wave information storage unit
45 Electric field strength information storage unit
50 Abnormal disconnection call investigation device
51 Control unit
52 Abnormally disconnected call information storage unit
53 Area name storage by base station
54 Questionnaire Form / Answer
55 Abnormal disconnect call cause analysis result storage unit
60 Internet

Claims

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect cause analysis system in mobile communication comprising an abnormal disconnect call investigation device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
Means for transmitting abnormally disconnected call information from the mobile communication switch to the abnormally disconnected call investigation device via the maintenance information management device when a radio link between the portable mobile device and the base station is abnormally disconnected; Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the abnormal disconnection call information, and when the abnormal disconnection call survey device is a reason for disconnection requiring a questionnaire survey, Means for transmitting a survey request mail to the portable mobile device; means for accessing the abnormal disconnect call investigation device as an access destination described in the questionnaire survey request mail by the portable mobile device; and the abnormal disconnection accessed. A means for transmitting a questionnaire form screen information to the portable mobile device by a call investigation device, and a user inputting a questionnaire response content on the screen of the portable mobile device In mobile communication, characterized in that the means for transmitting and the abnormal disconnection call investigation device that has received the questionnaire response have means for identifying the location of the abnormal disconnection and analyzing the cause based on the contents of the questionnaire response Abnormal cutting cause analysis system.

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect cause analysis system in mobile communication comprising an abnormal disconnect call investigation device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
The maintenance information management device receives and accumulates traffic information indicating the usage status of a radio channel periodically transmitted from the mobile communication switch, interference wave information in each base station, and field strength information for each radio channel. And when the radio link between the portable mobile device and the base station is abnormally disconnected, the mobile communication exchange transmits abnormally disconnected call information to the abnormally disconnected call investigation device via the maintenance information management device. Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the abnormal disconnect call information, and the abnormal disconnect call survey when the survey is a disconnect reason requiring the survey Means for transmitting a questionnaire survey request mail to the portable mobile device; and the abnormal disconnection wherein the portable mobile device is the access destination described in the questionnaire request email Means for accessing the call investigation device; means for the accessed abnormally disconnected call investigation device to send questionnaire form screen information to the portable mobile device; and the user inputs the contents of the questionnaire response on the screen of the portable mobile device. Means for transmitting, means for identifying the abnormal disconnection call investigation device receiving the questionnaire response, identifying the location of occurrence of abnormal disconnection based on the content of the questionnaire response, and means for identifying the location of the abnormal disconnection call and the maintenance An abnormal disconnection cause analysis system in mobile communication, comprising means for analyzing a cause of disconnection with reference to traffic information, interference wave information, and electric field strength information stored in an information management device.

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect cause analysis system in mobile communication comprising an abnormal disconnect call investigation device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
Means for transmitting abnormally disconnected call information from the mobile communication switch to the abnormally disconnected call investigation device via the maintenance information management device every time a radio link between the portable mobile device and the base station is abnormally disconnected; Means for accumulating abnormally disconnected call information received by the abnormally disconnected call investigating device; Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the information and preset additional conditions, and when it is determined that a questionnaire survey is necessary, the abnormal disconnect call survey device sends a questionnaire survey request mail Means for transmitting to a mobile device; means for accessing the abnormally disconnected call investigation device, which is the access destination described in the questionnaire request email, by the portable mobile device; The accessed abnormal disconnected call investigation device transmits means for transmitting questionnaire form screen information to the portable mobile device, means for the user to input and send questionnaire response contents on the screen of the portable mobile device, and receives the questionnaire response An abnormal disconnect cause analysis system in mobile communication, wherein the abnormal disconnect call investigation device has means for identifying the location of occurrence of an abnormal disconnect and analyzing the cause based on the contents of a questionnaire response.

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect cause analysis system in mobile communication comprising an abnormal disconnect call investigation device, and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
The maintenance information management device receives and accumulates traffic information indicating the usage status of a radio channel periodically transmitted from the mobile communication switch, interference wave information in each base station, and field strength information for each radio channel. Each time the radio link between the mobile station and the base station is abnormally disconnected, the mobile communication switch sends the abnormally disconnected call information to the abnormally disconnected call investigation device via the maintenance information management device. Means for storing abnormally disconnected call information received by the abnormally disconnected call investigation device, and for abnormally disconnected call information accumulated by the abnormally disconnected call investigating device for a certain period of time in the past. Means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the abnormally disconnected call information and preset additional conditions, and when it is determined that a questionnaire survey is necessary, the abnormally disconnected call Means for transmitting a questionnaire survey request mail to the corresponding portable mobile device, and means for accessing the abnormal disconnect call investigation device that is the access destination described in the questionnaire survey request mail. The abnormal disconnect call investigation device transmits a questionnaire form screen information to the portable mobile device, a means for a user to input and send a questionnaire response content on the screen of the portable mobile device, and the questionnaire response received The abnormal disconnection call investigation device identifies the location of occurrence of abnormal disconnection based on the questionnaire response content, and the abnormal disconnection call investigation device includes the questionnaire response content and the traffic information stored in the maintenance information management device, interference Means for analyzing the cause of disconnection with reference to wave information and electric field strength information. Always disconnect cause analysis system.

The additional conditions include that the disconnected wireless line number is biased, that the disconnected time is biased, that the wireless channel disconnection frequency exceeds a preset threshold within a certain time, and that the other party of communication Any one condition or a combination of multiple conditions is applied, including that there is a bias in that the number of radio link disconnections of a specific mobile mobile device exceeds a preset threshold value within a certain period of time. 5. The abnormal disconnection cause analysis system in mobile communication according to claim 3 or 4.

The abnormally disconnected call information includes the reason for disconnecting the wireless line, the disconnected wireless line number, the date and time of disconnection, the other party's subscriber number for communication at the time of disconnection, the mobile station management number of the mobile station that has been abnormally disconnected, and the mobile station subscription 6. The abnormal disconnect cause analysis system in mobile communication according to claim 1, further comprising a personal identification number and a mobile device mail address.

The questionnaire responses contents, the location of a cutaway, or indoor or outdoor, or was stopped what was moving, any one of the preceding claims, characterized in that it comprises at least one of the moving means Abnormal disconnection cause analysis system in mobile communication as described.

8. The questionnaire form is generated for each user, and the cutting date and time and the area name of the area covered by the base station where the cutting occurred are described in advance and transmitted to the portable mobile device. An abnormal disconnection cause analysis system in mobile communication according to claim 1.

The abnormal disconnection of the wireless line between the portable mobile device and the base station is a disconnection of the wireless line due to a cause other than when the calling user or the terminating user spontaneously ends the call due to the end of the communication, If disconnected, the wireless line cannot be established when calling from the portable mobile device, and if the connection is broken during the connection leading to establishment of communication, the wireless line cannot be established when the portable mobile device receives an incoming call. The abnormal disconnection in mobile communication according to any one of claims 1 to 8, including a case in which the wireless line cannot be established when the wireless line is switched when it is disconnected halfway, and is disconnected. Cause analysis system.

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect call investigation device in a system comprising an abnormal disconnect call investigation device and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
Means for receiving abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device; means for determining whether or not a questionnaire is necessary based on the reason for disconnection included in the received abnormally disconnected call information; Means for sending a questionnaire survey request email to the portable mobile device, means for sending questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, and An abnormal disconnect call investigation device comprising: means for receiving a questionnaire response content sent from a portable mobile device; and means for identifying the cause of abnormal disconnect and analyzing the cause based on the content of the questionnaire response .

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect call investigation device in a system comprising an abnormal disconnect call investigation device and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
Means for receiving abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device; means for determining whether or not a questionnaire is necessary based on the reason for disconnection included in the received abnormally disconnected call information; Means for sending a questionnaire survey request email to the portable mobile device, means for sending questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, and Means for receiving the contents of the questionnaire response sent from the portable mobile device, means for identifying the location where the abnormal disconnection occurred based on the contents of the questionnaire response, the contents of the questionnaire response and the traffic information stored in the maintenance information management device, An abnormal disconnect call investigation device characterized by having means for analyzing cause of disconnection by referring to interference wave information and electric field strength information .

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect call investigation device in a system comprising an abnormal disconnect call investigation device and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
The means for receiving and storing abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device, and the abnormally disconnected call information stored for a certain period of time in the past for a certain period of time A means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the call information and preset additional conditions, and a means for transmitting a questionnaire survey request mail to the corresponding portable mobile device when a questionnaire survey is determined to be necessary Means for transmitting questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, means for receiving the questionnaire response content sent from the portable mobile device, and abnormal disconnection based on the questionnaire response content An abnormal disconnect call investigation device characterized by comprising means for identifying the location of occurrence and analyzing the cause.

It is connected to a portable mobile device, a base station connected to the portable mobile device via a wireless line, a mobile communication switch, a maintenance information management device connected to the mobile communication switch, and the maintenance information management device An abnormal disconnect call investigation device in a system comprising an abnormal disconnect call investigation device and the Internet to which the mobile communication switch and the abnormal disconnect call investigation device are connected,
The means for receiving and storing abnormally disconnected call information sent from the mobile communication switch via the maintenance information management device, and the abnormally disconnected call information stored for a certain period of time in the past for a certain period of time A means for determining whether or not a questionnaire survey is necessary based on the reason for disconnection included in the call information and preset additional conditions, and a means for transmitting a questionnaire survey request mail to the corresponding portable mobile device when a questionnaire survey is determined to be necessary Means for transmitting questionnaire form screen information to the portable mobile device when accessed from the portable mobile device, means for receiving the questionnaire response content sent from the portable mobile device, and abnormal disconnection based on the questionnaire response content For identifying the location where the problem occurred, questionnaire response contents, traffic information and interference wave information stored in the maintenance information management device Abnormal disconnection call survey apparatus characterized by having a means for analyzing cut cause by referring to field strength information.

The additional conditions include that the disconnected wireless line number is biased, that the disconnected time is biased, that the wireless channel disconnection frequency exceeds a preset threshold within a certain time, and that the other party of communication Any one condition or a combination of multiple conditions is applied, including that there is a bias in that the number of radio link disconnections of a specific mobile mobile device exceeds a preset threshold value within a certain period of time. 14. The abnormal disconnect call investigation device according to claim 12 or 13.

The abnormally disconnected call information includes the reason for disconnecting the wireless line, the disconnected wireless line number, the date and time of disconnection, the other party's subscriber number for communication at the time of disconnection, the mobile station management number of the mobile station that has been abnormally disconnected, and the mobile station subscription The abnormal disconnect call investigation device according to any one of claims 10 to 14, further comprising a person number and a mobile device mail address.

The questionnaire responses contents, the location of a cutaway, or indoor or outdoor, or was stopped what was moving any one of claims 10 to 15, characterized in that it comprises at least one of the moving means The abnormal disconnect call investigation device described.

The questionnaire form is generated for each user, and the cutting date and time and the area name of the area covered by the base station where the cutting occurred are described in advance and transmitted to the portable mobile device. The abnormal disconnect call investigation device according to claim 1.

An abnormal disconnect cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a portable mobile device and a base station, wherein abnormal disconnect call information is transmitted from a mobile communication switch to an abnormal disconnect call investigation device when an abnormal disconnection occurs, and the abnormal The disconnect call investigation device determines whether or not a cause analysis investigation is necessary depending on the reason for disconnection included in the abnormal disconnect call information, and requests an investigation to the portable mobile device when an investigation is necessary. An abnormal cutting cause analysis method characterized by analyzing a cutting cause.

An abnormal disconnect cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a portable mobile device and a base station, wherein abnormal disconnect call information is transmitted from a mobile communication switch to an abnormal disconnect call investigation device when an abnormal disconnection occurs, and the abnormal The disconnect call investigation device determines whether or not a cause analysis investigation is necessary depending on the reason for disconnection included in the abnormal disconnect call information, requests a questionnaire survey to the portable mobile device when an investigation is necessary, and the received questionnaire response contents and external The cause of abnormal disconnection is analyzed by referring to the traffic information, interference wave information, and electric field strength information of each base station acquired from the maintenance information management apparatus of the above.

An abnormal disconnect cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a portable mobile device and a base station, and transmitting abnormal disconnect call information from the mobile communication switch to the abnormal disconnect call investigation device every time an abnormal disconnection occurs. The abnormal disconnect call investigation device accumulates the abnormal disconnect call information and sets the reason for disconnection included in the abnormal disconnect call information and the preset value for the abnormal disconnect call information stored in the past predetermined time every predetermined time. Whether the cause analysis investigation is necessary or not is determined according to the added conditions, and when the investigation is necessary, the portable mobile device is requested to conduct a questionnaire investigation, and the cause of the abnormal disconnection is analyzed based on the received questionnaire response content. Abnormal disconnection cause analysis method.

An abnormal disconnect cause analysis method for analyzing the cause of abnormal disconnection of a radio link between a portable mobile device and a base station, and transmitting abnormal disconnect call information from the mobile communication switch to the abnormal disconnect call investigation device every time an abnormal disconnection occurs. The abnormal disconnect call investigation device accumulates the abnormal disconnect call information and sets the reason for disconnection included in the abnormal disconnect call information and the preset value for the abnormal disconnect call information stored in the past predetermined time every predetermined time. Each base station that determines whether or not cause analysis investigation is necessary according to the added conditions, requests a questionnaire investigation to the portable mobile device when the investigation is necessary, and obtains the contents of the received questionnaire response and the external maintenance information management device The cause of abnormal disconnection is analyzed by referring to the traffic information, interference wave information, and electric field strength information.

A program for causing a computer to function as the abnormal disconnect call investigation device according to any one of claims 10 to 17.