JP3715197B2 - Power saving mode transition method and restart method for wireless communication system - Google Patents

Power saving mode transition method and restart method for wireless communication system Download PDF

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JP3715197B2
JP3715197B2 JP2000353359A JP2000353359A JP3715197B2 JP 3715197 B2 JP3715197 B2 JP 3715197B2 JP 2000353359 A JP2000353359 A JP 2000353359A JP 2000353359 A JP2000353359 A JP 2000353359A JP 3715197 B2 JP3715197 B2 JP 3715197B2
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station
base station
power saving
saving mode
reception operation
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JP2002158609A (en
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裕史 矢村
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

PROBLEM TO BE SOLVED: To obtain a power-saving mode transit method and a restart method for a wireless communication system, with which the energy of the entire system can be saved. SOLUTION: A base station 1 transmits a power-saving mode transition instructions to terminal stations 2, the terminal stations 2, receiving the instruction, shift to intermittent reception after transmitting the state of the own stations and confirmation of the shift instruction to the base station, the base station 1 receiving the state of the terminal stations and the transition instruction confirmation intermittently transmits notice information with the timing of the intermittent reception of the terminal stations 2, and shifts to the intermittent reception for accepting a system restart request from the terminal stations.

Description

【０００１】
【発明の属する技術分野】
この発明はＴＤＭＡ（時分割多元接続方式）無線通信システムにおける省電力化に係り、特に無線通信システムの省電力モード移行方法および再起動方法に関するものである。
【０００２】
【従来の技術】
従来のＴＤＭＡ無線通信システムでは、基地局は常時連続送受信を行っている。また、移動局の消費電力低減を図る方法としては、例えば特開平７−２２９９８号公報に記載されているように、移動局が基地局からの報知情報を連続受信せずに、スーパーフレーム間隔で間欠受信する等の方法が提案されている。
【０００３】
図９は従来のＴＤＭＡ無線通信システムの構成を示す構成図である。
図において、１は基地局、２は移動局である。基地局１は、下り制御チャネルを使って常時移動局２に対して制御情報を連続送信している。また、移動局２からの発呼要求を受け付けるため、基地局１は常に連続受信状態におかれている。移動局２は、少なくとも基地局１からの呼出信号、すなわち、ページングが送信されるタイミングにだけ受信動作を行い、その他の時間は非受信状態におかれるようになっている。したがって、このような間欠受信を行うことにより、移動局２は受信機部分の消費電力低減を図っている。
【０００４】
図１０は、上述の移動局２の間欠受信を説明するための下り制御チャネルのフレーム構成例を示す。基地局１は、制御チャネルを使用してフレーム毎に制御情報を送信する。制御情報には、報知情報ＢＣＣＨ、ページングＰＣＨ、その他様々なものが含まれている。この下り制御チャネルの構成は、フレーム毎に送信される制御スロットを順に並べたもので、スーパーフレームで一つの制御情報を構成している。移動局２は、少なくともページングＰＣＨを受信できればよく、省電力状態にあるときにスーパーフレームの先頭で受信機部の電源をオンにして受信動作を開始し、ページングＰＣＨの終了時に電源をオフにして再び省電力状態に戻る電源制御方法を行っている。
【０００５】
【発明が解決しようとする課題】
従来のＴＤＭＡ無線通信システムの省電力モード移行方法は、以上のように構成されているが、基地局１は連続送受信状態におかれるようになっていた。これは、携帯電話のような民需用システムにおいては当然の条件として有効である。しかし公共の業務用や防災行政用システム等では、時間帯等によっては回線使用率が下がるため、常にシステムを定常状態で稼動しておく必要はない。また、基地局や中継局は、大電力で送信するため、常時連続送信を行うことは効率が悪い。特に、災害時等におけるバッテリー使用においては、バッテリーの急激な消耗を招くなどの課題があった。
【０００６】
この発明は上記のような課題を解決するためになされたもので、システム全体の省エネルギー化を図ることができる無線通信システムの省電力モード移行方法および再起動方法を得ることを目的とする。
【０００７】
【課題を解決しようとする手段】
この発明に係る無線通信システムの省電力モード移行方法は、基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、基地局が複数の端末局に対して省電力モード移行指示を送信し、この省電力モード移行指示を受信した端末局が自局状態および移行指示確認を基地局に送信した後間欠受信動作に移り、端末局の自局状態および移行指示確認を受信した基地局が報知情報の連続送信を端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠受信動作に移るようにしたものである。
【０００８】
この発明に係る無線通信システムの省電力モード移行方法は、省電力モードにあることを端末局が認識できるパラメータを基地局から間欠送信される報知情報に含めて送信し、端末局が報知情報を受信したときからでも省電力モードの間欠受信動作に移れるようにしたものである。
【０００９】
この発明に係る無線通信システムの再起動方法は、基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、基地局が複数の端末局に対して省電力モード移行指示を送信し、この省電力モード移行指示を受信した端末局が自局状態および移行指示確認を基地局に送信した後間欠受信動作に移り、端末局の自局状態および移行指示確認を受信した基地局が報知情報の連続送信を端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠送受信動作に移って省電力モードを形成し、基地局が複数の端末局に対して所定の期間にシステム再起動指示を端末局の間欠受信動作のタイミングに合わせて送信して連続送受信動作に戻り、端末局が間欠受信動作時にシステム再起動指示を受信して連続受信動作に戻るようにしたものである。
【００１０】
この発明に係る無線通信システムの再起動方法は、基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、基地局が複数の端末局に対して省電力モード移行指示を送信し、この省電力モード移行指示を受信した端末局が自局状態および移行指示確認を基地局に送信した後間欠受信動作に移り、端末局の自局状態および移行指示確認を受信した基地局が報知情報の連続送信を端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠送受信動作に移って省電力モードを形成し、複数の端末局のいずれか１局が、基地局の間欠受信動作のタイミングに合わせて発呼のためのシステム再起動要求を基地局に対して送信し、このシステム再起動要求を受信した基地局が間欠受信動作中のすべての端末局に対してシステム再起動指示を所定の期間内にかつ端末局の間欠受信動作のタイミングに合わせて送信して連続送受信動作に戻り、システム再起動指示を受信した端末局が連続受信動作に戻るようにしたものである。
【００１４】
【発明の実施の形態】
以下、この発明の実施の一形態を説明する。
実施の形態１．
図１はこの発明の実施の形態１に係る無線通信システムの構成を示すもので、基地局および複数の移動局で構成される移動系ＴＤＭＡ無線通信システムにおける省電力モード移行方法とシステム再起動方法を説明する。
【００１５】
図において、１は基地局、２は移動局（端末局）である。１１は基地局１から各移動局２への下り制御チャネルを示し、２１は移動局２から基地局１への上り制御チャネルを示す。定常運用時の基地局１は、下り制御チャネル１１を利用して移動局２に報知情報ＣＣＨをフレーム毎に送信する連続送信を行う。移動局２は上り制御チャネル２１を利用して基地局１に対して発呼要求信号すなわち発信無線状態報告を送信する。
【００１６】
先ず、図２は省電力モード移行時の接続シーケンスを示すもので、これにより省電力モード移行の動作について説明する。
図において、連続送受信を行う定常状態におかれていた基地局１から移動局２に対して省電力モード移行指示を下り制御チャネル１１を利用して送信する。移動局２は、この省電力モード移行指示を受信すると、直ちに自局状態および移行指示確認を基地局１に送信し、省電力モードに移行して間欠受信動作に切り換わり、基地局１から間欠送信される報知情報ＣＣＨを受信するためのＣＣＨサーチを開始する。ここで、各移動局２からの移行指示確認を受信できるように、基地局１は省電力モード移行指示を送信し続けるが、移動局２からの移行指示確認をすべて受信できなくても、自局のタイマーによるタイムアウトで所定の期間が過ぎると省電力モードに移行する。
【００１７】
基地局１は、省電力モードの状態において、報知情報ＣＣＨを下り制御チャネル１１で間欠送信する。これにより、基地局１は大電力で連続送信し続ける必要がなくなるため、消費電力を大幅に低減し、緊急時のバッテリー駆動効率を上げることができる。
【００１８】
また、省電力モードにある基地局１は、移動局２からのシステム再起動要求ＵＷ１を受け付けるＵＷ１サーチのために間欠受信を行う。このシステム再起動要求ＵＷ１は、移動局２が通信を再開したい場合に、基地局１に対してシステム全体を定常状態に戻すよう要求するために送信されるもので、特定パターンで構成された連続信号である。
従来の基地局では、常時発呼を受け付けるものとして連続受信を行っていたが、実施の形態１では、システム全体を意図的に省電力状態にするため、連続受信を行う必要はない。前述の間欠送信に加え、このように間欠受信を行うことで、基地局１の消費電力のさらなる低減を図ることができる。
【００１９】
一方、移動局２は、基地局１の報知情報ＣＣＨの間欠送信タイミングに合わせて、間欠受信すなわちＣＣＨサーチを行うだけで、その他の時間は受信動作を停止しており、消費電力を節減する。
ここで、基地局１から間欠送信される報知情報ＣＣＨには、システムが省電力モードにあることを移動局２が認識できるためのパラメータが含まれる。したがって、システムが省電力モードに入った際に受信状態の不都合や電源を切っていたために、移動局２の中に省電力モード移行指示を受信できなかったものがあった場合、後でこの報知情報ＣＣＨを受信することにより省電力モードへと移行するよう動作するようにしている。
【００２０】
図３に、移動局２の要求によりシステム全体が省電力モードから定常状態に戻る動作の接続シーケンスを示す。
図において、移動局２のいずれか１局が通信を行うために、先ず基地局１に対してシステム再起動要求ＵＷ１を、基地局１の間欠受信動作のタイミングに合わせて送信する。基地局１は、このシステム再起動要求ＵＷ１を受信すると、下り制御チャネル１１を利用してすべての移動局２に対してＣＣＨサーチのタイミングでシステム再起動指示を送信する。各移動局２はシステム再起動指示を受信すると直ちに連続受信の定常状態に戻る。また、回線障害などでシステム再起動指示を受信できない移動局２がある場合には、自局のタイマーによるタイムアウトによって定常状態に戻る。なお、定常状態に戻った基地局の報知情報に、定常状態であることを知らせるパラメータが含まれている。次に基地局１は、自局のタイマーのタイムアウトでシステム再起動指示の送信を停止し、連続送受信の定常状態に戻る。その後、基地局１は報知情報ＣＣＨの連続送信を開始し、最初にシステム再起動要求ＵＷ１を送った移動局２は発呼要求信号すなわち発信無線状態報告を送信し、通信を再開する。
【００２１】
図４に、基地局１の指示によりシステム全体が省電力モードから定常状態に戻る動作の接続シーケンスを示す。
図において、基地局１はすべての移動局２に対して間欠送信時にシステム再起動指示の送信を行い、各移動局２はこのシステム再起動指示をＣＣＨサーチで受信し、前述と同様の復帰動作を行う。すなわち、各移動局２はシステム再起動指示を受信すると直ちに連続受信の定常状態に戻る。次に基地局１は、自局のタイマーのタイムアウトでシステム再起動指示の送信を停止し連続送受信の定常状態に戻る。その後、基地局１は報知情報ＣＣＨの連続送信を開始し、通信を再開する状態となる。
【００２２】
以上のように、この実施の形態１によれば、基地局１は、省電力モード時に報知情報ＣＣＨを間欠送信する以外には送信を停止させているので、大電力の連続送信が不要となり消費電力を大幅に低減し、緊急時のバッテリー駆動効率を上げることができる効果が得られる。また、基地局１は、省電力モード時の受信動作においても、システム再起動要求ＵＷ１を受け付けるための間欠受信動作以外には受信動作を停止させているので、省電力化をさらに図れる効果が得られる。一方、移動局２においても、報知情報ＣＣＨの間欠送信に対してタイミングを合わせた間欠受信動作以外には送受信動作を行わないようにして省電力化を図れる効果がある。したがって、基地局１と移動局２を併せた無線通信システム全体において、多大な電力削減を可能にする効果が得られる。
また、実施の形態１によれば、システムが省電力モードから復帰するために基地局１からの指示による場合と任意の移動局２からの要求による場合のいずれでも不都合なく再起動が行えるので、無線通信システム全体の省電力化に伴う再起動方法として最適なものを提供する効果が得られる。
さらに、システムが省電力モードに入ったときに、基地局１から間欠送信される報知情報ＣＣＨに、システムが省電力モードにあることを認識できるパラメータを含めているので、省電力モード移行指示を受信できなかった移動局２があったとしても、その報知情報ＣＣＨを受信したときから省電力モードに切り換わることができ、省電力化の動作をより確実なものにする効果がある。
【００２３】
実施の形態２．
図５において、この発明の実施の形態２に係る無線通信システムのを示すもので、親局、中継局および複数の子局または戸別受信機で構成される固定系ＴＤＭＡ無線通信システムにおける省電力モード移行方法とシステムの再起動方法について説明する。
【００２４】
図において、３は親局、４は中継局、５は子局である。３１は親局３から中継局４への下り制御チャネル、４１は中継局４から子局５への下り制御チャネル、４２は中継局４から親局３への上り制御チャネル、５１は子局５から中継局４への上り制御チャネルを示す。
定常運用時の親局３は、中継局４を介して下り制御チャネル３１，４１を利用して、すべての子局５に報知情報ＣＣＨを送信する。また子局５は中継局４を介して上り制御チャネル５１，４２を利用し、親局３に発呼要求信号すなわち発信無線状態報告を送信するようになっている。
【００２５】
図６は省電力モード移行時の接続シーケンスを示すもので、これにより省電力モード移行動作について説明する。
図において、定常状態で動作していた親局３は、下り制御チャネル３１，４１を利用して中継局４および子局５に対して省電力モード移行指示を送信する。子局５は、この省電力モード移行指示を受信すると直ちに自局状態および移行指示確認を中継局４を介して親局３に送信し、省電力モードに移行する。中継局４は、各子局５からの移行指示確認を親局３に送信した後、省電力モードに移行する。また、中継局４は、すべての子局５からの移行指示を受信できなくても、親局３に対して自局状態並びに移行指示確認を送信した後、自局のタイマーのタイムアウトにより省電力モードに移行する。親局３は、中継局４からの移行指示確認を受信するまで、省電力モード移行指示を送信し続け、中継局４からの移行指示確認を受信した後、省電力モードに移行する。
【００２６】
親局３は、省電力モードの状態において、報知情報ＣＣＨの送信を停止する。また、中継局４からのシステム再起動指示ＵＷ２を受け付けるＵＷ２サーチを行うために間欠受信動作に移る。ここで、システム再起動指示ＵＷ２は、システム全体を定常状態に戻すために親局３および子局（戸別受信機）５に対して送信するもので、特定パターンで構成された連続信号である。
【００２７】
中継局４は、省電力モードの状態において送信を停止する。また、子局５または親局３からのシステム再起動要求ＵＷ１を受け付けるＵＷ１サーチを行うために間欠受信動作に移る。このシステム再起動要求ＵＷ１は、子局５または親局３が通信を再開するために、システム全体を定常状態に戻すよう中継局４に対して要求するものであり、特定パターンで構成された連続信号である。
【００２８】
子局５は、省電力モードの状態において、中継局４からのシステム再起動指示ＵＷ２を受け付けるＵＷ２サーチを行うために間欠受信動作に移る。また、親局３からの報知情報ＣＣＨがある一定時間受信されなければ、子局５は自局のタイマーのタイムアウトにより省電力モードに移行するように動作する。
【００２９】
図７に、子局の要求によりシステム全体が省電力モードから定常状態に戻る動作の接続シーケンスを示す。
図において、いずれかの子局５が通信を行うために、まず中継局４に対して、中継局４の間欠受信動作のタイミングに合わせてシステム再起動要求ＵＷ１を送信する。中継局４はこのシステム再起動要求ＵＷ１を受信すると、親局３およびすべての子局５に対して、これらの間欠受信動作すなわちＵＷ２サーチのタイミングに合わせてシステム再起動指示ＵＷ２を送信する。親局３はシステム再起動指示ＵＷ２を受信すると、直ちに定常状態に戻り、報知情報ＣＣＨの連続送信を開始する。また、子局５はシステム再起動指示ＵＷ２を受信すると直ちに定常状態に戻り、報知情報ＣＣＨの連続受信を行う。中継局４は、自局のタイマーによるタイムアウトでシステム再起動指示ＵＷ２の送信を停止して定常状態に戻り、親局３からの報知情報ＣＣＨを中継して子局５に送信する。その後、最初にシステム再起動要求ＵＷ１を送信した子局５は、発呼要求信号すなわち発信無線状態報告を送信し、通信を再開する。
【００３０】
図８に、親局の指示によりシステム全体が省電力モードから定常状態に戻る動作の接続シーケンスを示す。
図において、親局３は中継局４に対して、システム再起動要求ＵＷ１を中継局４のＵＷ１サーチのタイミングに合わせて送信を行う。中継局４はこのシステム再起動要求ＵＷ１を受信後、前述と同様の動作を行う。すなわち、親局３およびすべての子局５に対して、システム再起動指示ＵＷ２を間欠受信のタイミングに合わせて送信する。親局３はシステム再起動指示ＵＷ２を受信すると、直ちに定常状態に戻り、報知情報ＣＣＨの連続送信を開始する。子局５はシステム再起動指示ＵＷ２を受信すると直ちに定常状態に戻り、報知情報ＣＣＨの連続受信を行う。中継局４は、自局のタイマーによるタイムアウトでシステム再起動指示ＵＷ２の送信を停止して定常状態に戻り、親局３からの報知情報ＣＣＨを中継して子局５に連続送信する。
【００３１】
実施の形態２によれば、親局３は、省電力モード時に送信を停止しているので、大電力の連続送信が不要となり消費電力を大幅に低減し、緊急時のバッテリー駆動効率を上げることができる効果が得られる。また、親局３は、省電力モード時の受信においても、中継局４からのシステム再起動指示ＵＷ２を受け付けるための間欠受信動作以外には受信動作を停止させているので、省電力化をさらに図れる効果が得られる。一方、中継局４は、親局３および子局５から発せられるシステム再起動要求ＵＷ１を受け付けるための間欠受信動作以外には送受信動作を行わないようにして省電力化を図る効果が得られる。また、子局５は、中継局４からのシステム再起動指示ＵＷ２を受け付けるための間欠受信動作以外には送受信動作を停止させて省電力化を図ることができる効果が得られる。したがって、親局３、中継局４および子局５を併せた無線通信システム全体において多大な電力削減を可能とする効果が得られる。
また、実施の形態２によれば、システムが省電力モードから復帰するために親局３からの要求による場合と任意の子局５からの要求による場合のいずれにおいても、中継局５を含めて不都合なく再起動が行えるので、無線通信システム全体の省電力化の再起動方法として最適なものを提供する効果が得られる。
【００３２】
【発明の効果】
以上のように、この発明によれば、基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、基地局が複数の端末局に対して省電力モード移行指示を送信し、この省電力モード移行指示を受信した端末局が自局状態および移行指示確認を基地局に送信した後間欠受信動作に移り、端末局の自局状態および移行指示確認を受信した基地局が報知情報の連続送信を端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠受信動作に移るように構成したので、基地局は、省電力モード時に報知情報を間欠送信する以外には送信を停止させて大電力の連続送信を不要とし、システム再起動要求を受け付けるための間欠受信動作以外には受信動作を停止させて
省電力化を図り、緊急時のバッテリー駆動効率を上げることができる効果がある。
また、端末局においても、基地局からの報知情報の間欠送信に対してタイミングを合わせた間欠受信動作以外には受信動作を行わないようにして省電力化を図る効果がある。したがって、基地局と端末局を併せた無線通信システム全体において、多大な電力削減を可能にする効果がある。
【００３３】
この発明によれば、省電力モードにあることを端末局が認識できるパラメータを基地局から間欠送信される報知情報に含めて送信し、端末局が報知情報を受信したときからでも省電力モードの間欠受信動作に移れるように構成したので、省電力モード移行指示を受信できなかった端末局があったとしても、その後に報知情報を受信したときから省電力モードに切り換わることができ、省電力化移行の動作をより確実なものにする効果がある。
【００３４】
この発明によれば、基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、基地局が複数の端末局に対して省電力モード移行指示を送信し、この省電力モード移行指示を受信した端末局が自局状態および移行指示確認を基地局に送信した後間欠受信動作に移り、端末局の自局状態および移行指示確認を受信した基地局が報知情報の連続送信を端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠送受信動作に移って省電力モードを形成し、基地局が複数の端末局に対して所定の期間にシステム再起動指示を端末局の間欠受信動作のタイミングに合わせて送信して連続送受信動作に戻り、端末局が間欠受信動作時にシステム再起動指示を受信して連続受信動作に戻るように構成したので、基地局からの指示により不都合なくシステムが省電力モードから復帰するための再起動が行え、無線通信システム全体の省電力化に伴う再起動方法として最適なものを提供できる効果がある。
【００３５】
この発明によれば、基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、基地局が複数の端末局に対して省電力モード移行指示を送信し、この省電力モード移行指示を受信した端末局が自局状態および移行指示確認を基地局に送信した後間欠受信動作に移り、端末局の自局状態および移行指示確認を受信した基地局が報知情報の連続送信を端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠送受信動作に移って省電力モードを形成し、複数の端末局のいずれか１局が、基地局の間欠受信動作のタイミングに合わせて発呼のためのシステム再起動要求を基地局に対して送信し、このシステム再起動要求を受信した基地局が間欠受信動作中のすべての端末局に対してシステム再起動指示を所定の期間内にかつ端末局の間欠受信動作のタイミングに合わせて送信して連続受信動作に戻り、システム再起動指示を受信した端末局が連続送受信動作に戻るように構成したので、端末局からの要求により不都合なくシステムが省電力モードから復帰するための再起動が行え、無線通信システム全体の省電力化に伴う再起動方法として最適なものを提供できる効果がある。
【図面の簡単な説明】
【図１】 この発明の実施の形態１に係る無線通信システムを示す構成図である。
【図２】 実施の形態１における省電力モード移行時の接続シーケンスを示す説明図である。
【図３】 実施の形態１におけるシステム再起動時の接続シーケンスを示す説明図である。
【図４】 実施の形態１におけるシステム再起動時の接続シーケンスを示す説明図である。
【図５】 この発明の実施の形態２における無線通信システムを示す構成図である。
【図６】 実施の形態２における省電力モード移行時の接続シーケンスを示す説明図である。
【図７】 実施の形態２におけるシステム再起動時の接続シーケンスを示す説明図である。
【図８】 実施の形態２におけるシステム再起動時の接続シーケンスを示す説明図である。
【図９】 従来のＴＤＭＡ無線通信システムを示す構成図である。
【図１０】 従来のＴＤＭＡ無線通信システムの制御チャネルを示す説明
図である。
【符号の説明】
１ 基地局、２ 移動局（端末局）、３ 親局、４ 中継局、５ 子局、１１，３１，４１ 下り制御チャネル、２１，４２，５１ 上り制御チャネル。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to power saving in a TDMA (Time Division Multiple Access) wireless communication system, and more particularly to a power saving mode transition method and a restart method in a wireless communication system.
[0002]
[Prior art]
In the conventional TDMA wireless communication system, the base station always performs continuous transmission / reception. As a method for reducing the power consumption of the mobile station, for example, as described in Japanese Patent Laid-Open No. 7-22998, the mobile station does not continuously receive broadcast information from the base station, but at superframe intervals. Methods such as intermittent reception have been proposed.
[0003]
FIG. 9 is a configuration diagram showing a configuration of a conventional TDMA wireless communication system.
In the figure, 1 is a base station and 2 is a mobile station. The base station 1 continuously transmits control information to the mobile station 2 constantly using the downlink control channel. Further, in order to accept a call request from the mobile station 2, the base station 1 is always in a continuous reception state. The mobile station 2 performs a reception operation only at least when a call signal from the base station 1, that is, paging is transmitted, and is placed in a non-reception state at other times. Therefore, by performing such intermittent reception, the mobile station 2 attempts to reduce the power consumption of the receiver portion.
[0004]
FIG. 10 shows a frame configuration example of the downlink control channel for explaining the intermittent reception of the mobile station 2 described above. The base station 1 transmits control information for each frame using the control channel. The control information includes broadcast information BCCH, paging PCH, and various other information. The configuration of this downlink control channel is such that control slots transmitted for each frame are arranged in order, and one control information is composed of a super frame. The mobile station 2 only needs to be able to receive at least the paging PCH. When the mobile station 2 is in the power saving state, the mobile station 2 starts the reception operation by turning on the power of the receiver unit at the beginning of the superframe, A power control method for returning to the power saving state is performed again.
[0005]
[Problems to be solved by the invention]
The conventional power saving mode transition method of the TDMA wireless communication system is configured as described above, but the base station 1 is in a continuous transmission / reception state. This is effective as a matter of course in a civilian system such as a mobile phone. However, in public business and disaster prevention administrative systems, etc., the line usage rate decreases depending on the time of day, so it is not always necessary to operate the system in a steady state. Also, since base stations and relay stations transmit with high power, it is inefficient to perform continuous transmission at all times. In particular, when the battery is used at the time of a disaster or the like, there is a problem that the battery is rapidly consumed.
[0006]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a power saving mode transition method and a restart method of a wireless communication system that can save energy in the entire system.
[0007]
[Means to solve the problem]
According to the wireless communication system transition method of the present invention, in a TDMA wireless communication system including a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations. The terminal station that has received this power saving mode transition instruction transmits its own station state and transition instruction confirmation to the base station, and then proceeds to an intermittent reception operation, and the base station that has received the terminal station's own station state and transition instruction confirmation broadcasts The continuous transmission of information is switched to the intermittent transmission operation that coincides with the timing of the intermittent reception operation of the terminal station, and the operation is shifted to the intermittent reception operation.
[0008]
A method for shifting to a power saving mode of a wireless communication system according to the present invention includes a parameter that allows a terminal station to recognize that it is in a power saving mode included in broadcast information intermittently transmitted from a base station, and the terminal station transmits broadcast information. Even after reception, the operation can be shifted to the intermittent reception operation in the power saving mode.
[0009]
In the TDMA wireless communication system including a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations. The terminal station that has received the power saving mode transition instruction transmits its own station state and transition instruction confirmation to the base station, and then proceeds to an intermittent reception operation. Switch the continuous transmission to the intermittent transmission operation that matches the timing of the intermittent reception operation of the terminal station and move to the intermittent transmission / reception operation to form the power saving mode, and the base station restarts the system for a plurality of terminal stations within a predetermined period Sends the instruction in accordance with the timing of the intermittent reception operation of the terminal station and returns to the continuous transmission / reception operation. When the terminal station receives the system restart instruction during the intermittent reception operation, It is that to return to.
[0010]
In the TDMA wireless communication system including a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations. The terminal station that has received the power saving mode transition instruction transmits its own station state and transition instruction confirmation to the base station, and then proceeds to an intermittent reception operation. Switching the continuous transmission to the intermittent transmission operation that matches the timing of the intermittent reception operation of the terminal station and moving to the intermittent transmission / reception operation to form a power saving mode, and any one of the plurality of terminal stations can perform the intermittent reception operation of the base station. A system restart request for outgoing calls is transmitted to the base station in accordance with the timing of the base station, and all terminals in which the base station that has received the system restart request is performing an intermittent reception operation The system restart instruction is transmitted within a predetermined period and in accordance with the timing of the intermittent reception operation of the terminal station to return to the continuous transmission / reception operation, and the terminal station receiving the system restart instruction returns to the continuous reception operation. It is a thing.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 shows a configuration of a radio communication system according to Embodiment 1 of the present invention. A power saving mode transition method and a system restart method in a mobile TDMA radio communication system composed of a base station and a plurality of mobile stations. Will be explained.
[0015]
In the figure, 1 is a base station and 2 is a mobile station (terminal station). 11 indicates a downlink control channel from the base station 1 to each mobile station 2, and 21 indicates an uplink control channel from the mobile station 2 to the base station 1. The base station 1 at the time of regular operation performs continuous transmission using the downlink control channel 11 to transmit the broadcast information CCH to the mobile station 2 for each frame. The mobile station 2 transmits a call request signal, that is, a transmission radio status report to the base station 1 using the uplink control channel 21.
[0016]
First, FIG. 2 shows a connection sequence at the time of shifting to the power saving mode, and the operation of shifting to the power saving mode will be described.
In the figure, a power saving mode shift instruction is transmitted from the base station 1 which has been in a steady state where continuous transmission / reception is performed, to the mobile station 2 using the downlink control channel 11. When the mobile station 2 receives this power saving mode transition instruction, it immediately transmits its own station state and transition instruction confirmation to the base station 1, shifts to the power saving mode and switches to the intermittent reception operation. A CCH search for receiving broadcast information CCH to be transmitted is started. Here, the base station 1 continues to transmit the power saving mode transition instruction so that the transition instruction confirmation from each mobile station 2 can be received. When a predetermined period elapses due to the time-out by the station timer, the mode shifts to the power saving mode.
[0017]
The base station 1 intermittently transmits the broadcast information CCH through the downlink control channel 11 in the power saving mode. As a result, the base station 1 does not need to continuously transmit with high power, so that power consumption can be greatly reduced and battery drive efficiency in an emergency can be increased.
[0018]
In addition, the base station 1 in the power saving mode performs intermittent reception for UW1 search for accepting the system restart request UW1 from the mobile station 2. The system restart request UW1 is transmitted to request the base station 1 to return the entire system to a steady state when the mobile station 2 wants to resume communication. Signal.
In the conventional base station, continuous reception is performed as a continuous reception of calls. However, in Embodiment 1, it is not necessary to perform continuous reception because the entire system is intentionally put into a power saving state. In addition to the above-described intermittent transmission, by performing intermittent reception in this way, the power consumption of the base station 1 can be further reduced.
[0019]
On the other hand, the mobile station 2 only performs intermittent reception, that is, CCH search, in synchronization with the intermittent transmission timing of the broadcast information CCH of the base station 1, and stops the reception operation at other times, thus saving power consumption.
Here, the broadcast information CCH intermittently transmitted from the base station 1 includes a parameter for allowing the mobile station 2 to recognize that the system is in the power saving mode. Therefore, when there is a mobile station 2 that cannot receive the power saving mode transition instruction due to the inconvenience of the reception state or the power being turned off when the system enters the power saving mode, this notification is made later. By receiving the information CCH, an operation is made to shift to the power saving mode.
[0020]
FIG. 3 shows a connection sequence of an operation in which the entire system returns from the power saving mode to the steady state in response to a request from the mobile station 2.
In the figure, in order for any one of the mobile stations 2 to perform communication, first, a system restart request UW1 is transmitted to the base station 1 in accordance with the timing of the intermittent reception operation of the base station 1. Upon receiving this system restart request UW1, the base station 1 transmits a system restart instruction to all mobile stations 2 using the downlink control channel 11 at the timing of CCH search. Each mobile station 2 returns to the steady state of continuous reception as soon as it receives a system restart instruction. When there is a mobile station 2 that cannot receive a system restart instruction due to a line failure or the like, the mobile station 2 returns to a steady state due to a time-out by the timer of the own station. Note that the notification information of the base station that has returned to the steady state includes a parameter that informs that it is in the steady state. Next, the base station 1 stops the transmission of the system restart instruction due to the timeout of its own timer, and returns to the steady state of continuous transmission / reception. Thereafter, the base station 1 starts continuous transmission of the broadcast information CCH, and the mobile station 2 that first sent the system restart request UW1 transmits a call request signal, that is, a transmission radio state report, and resumes communication.
[0021]
FIG. 4 shows a connection sequence of operations in which the entire system returns from the power saving mode to the steady state according to an instruction from the base station 1.
In the figure, base station 1 transmits a system restart instruction to all mobile stations 2 during intermittent transmission, and each mobile station 2 receives this system restart instruction through a CCH search, and performs a return operation similar to that described above. I do. That is, each mobile station 2 returns to the steady state of continuous reception as soon as it receives a system restart instruction. Next, the base station 1 stops the transmission of the system restart instruction due to the timeout of its own timer and returns to the steady state of continuous transmission / reception. Thereafter, the base station 1 starts continuous transmission of the broadcast information CCH and resumes communication.
[0022]
As described above, according to the first embodiment, the base station 1 stops transmission other than intermittently transmitting the broadcast information CCH in the power saving mode, so that high power continuous transmission is unnecessary and consumed. The power can be greatly reduced, and the battery drive efficiency in an emergency can be increased. Further, since the base station 1 stops the reception operation other than the intermittent reception operation for receiving the system restart request UW1 even in the reception operation in the power saving mode, an effect of further saving power can be obtained. It is done. On the other hand, the mobile station 2 also has an effect of saving power by not performing the transmission / reception operation other than the intermittent reception operation in which the timing is matched with the intermittent transmission of the broadcast information CCH. Therefore, in the whole radio communication system that combines the base station 1 and the mobile station 2, an effect of enabling a great power reduction is obtained.
Further, according to the first embodiment, the system can be restarted without any inconvenience in either the case of an instruction from the base station 1 or the case of a request from an arbitrary mobile station 2 in order to return from the power saving mode. An effect of providing an optimum restart method associated with power saving of the entire wireless communication system can be obtained.
Further, when the system enters the power saving mode, the broadcast information CCH intermittently transmitted from the base station 1 includes a parameter that can recognize that the system is in the power saving mode. Even if there is a mobile station 2 that could not be received, it is possible to switch to the power saving mode from the time when the broadcast information CCH is received, and there is an effect of making the power saving operation more reliable.
[0023]
Embodiment 2. FIG.
FIG. 5 shows a radio communication system according to Embodiment 2 of the present invention, which is a power saving mode in a fixed TDMA radio communication system including a master station, a relay station, and a plurality of slave stations or individual receivers. The migration method and system restart method will be described.
[0024]
In the figure, 3 is a master station, 4 is a relay station, and 5 is a slave station. 31 is a downlink control channel from the master station 3 to the relay station 4, 41 is a downlink control channel from the relay station 4 to the slave station 5, 42 is an uplink control channel from the relay station 4 to the master station 3, and 51 is the slave station 5 The uplink control channel from the relay station 4 to the relay station 4 is shown.
The master station 3 during normal operation transmits broadcast information CCH to all the slave stations 5 using the downlink control channels 31 and 41 via the relay station 4. The slave station 5 uses the uplink control channels 51 and 42 via the relay station 4 to transmit a call request signal, that is, a transmission radio status report to the master station 3.
[0025]
FIG. 6 shows a connection sequence at the time of shifting to the power saving mode, and the operation for shifting to the power saving mode will be described.
In the figure, the master station 3 operating in a steady state transmits a power saving mode transition instruction to the relay station 4 and the slave station 5 using the downlink control channels 31 and 41. Upon receiving this power saving mode transition instruction, the slave station 5 transmits its own station state and transition instruction confirmation to the parent station 3 via the relay station 4 and shifts to the power saving mode. The relay station 4 transmits the transition instruction confirmation from each slave station 5 to the master station 3 and then shifts to the power saving mode. Further, even if the relay station 4 cannot receive the transition instruction from all the slave stations 5, the relay station 4 transmits the own station state and the transition instruction confirmation to the master station 3, and then saves power by the timeout of its own timer. Enter mode. The master station 3 continues to transmit the power saving mode transition instruction until it receives the transition instruction confirmation from the relay station 4, and shifts to the power saving mode after receiving the transition instruction confirmation from the relay station 4.
[0026]
The master station 3 stops transmission of the broadcast information CCH in the power saving mode. Further, in order to perform a UW2 search for receiving a system restart instruction UW2 from the relay station 4, the operation proceeds to an intermittent reception operation. Here, the system restart instruction UW2 is transmitted to the master station 3 and the slave station (door-to-door receiver) 5 in order to return the entire system to a steady state, and is a continuous signal composed of a specific pattern.
[0027]
The relay station 4 stops transmission in the power saving mode. Further, in order to perform a UW1 search for accepting a system restart request UW1 from the slave station 5 or the master station 3, the operation shifts to an intermittent reception operation. This system restart request UW1 is a request for the relay station 4 to return the entire system to a steady state in order for the slave station 5 or the master station 3 to resume communication, and is a continuous pattern configured in a specific pattern. Signal.
[0028]
In the state of the power saving mode, the slave station 5 shifts to an intermittent reception operation in order to perform a UW2 search for receiving a system restart instruction UW2 from the relay station 4. If the broadcast information CCH from the master station 3 is not received for a certain period of time, the slave station 5 operates so as to shift to the power saving mode due to a timeout of its own timer.
[0029]
FIG. 7 shows a connection sequence of an operation in which the entire system returns from the power saving mode to the steady state in response to a request from the slave station.
In the figure, in order for any of the slave stations 5 to perform communication, first, a system restart request UW1 is transmitted to the relay station 4 in accordance with the timing of the intermittent reception operation of the relay station 4. When the relay station 4 receives the system restart request UW1, the relay station 4 transmits a system restart instruction UW2 to the master station 3 and all the slave stations 5 in accordance with the timing of these intermittent reception operations, that is, UW2 search. Upon receiving the system restart instruction UW2, the master station 3 immediately returns to the steady state and starts continuous transmission of the broadcast information CCH. Further, the slave station 5 immediately returns to the steady state upon receiving the system restart instruction UW2, and continuously receives the broadcast information CCH. The relay station 4 stops transmission of the system restart instruction UW2 due to a timeout by the timer of its own station, returns to the steady state, relays the notification information CCH from the master station 3, and transmits it to the slave station 5. Thereafter, the slave station 5 that first transmitted the system restart request UW1 transmits a call request signal, that is, a transmission radio state report, and resumes communication.
[0030]
FIG. 8 shows a connection sequence of an operation in which the entire system returns from the power saving mode to the steady state in accordance with an instruction from the master station.
In the figure, the master station 3 transmits a system restart request UW1 to the relay station 4 in accordance with the UW1 search timing of the relay station 4. The relay station 4 performs the same operation as described above after receiving this system restart request UW1. That is, the system restart instruction UW2 is transmitted to the master station 3 and all the slave stations 5 in accordance with the intermittent reception timing. Upon receiving the system restart instruction UW2, the master station 3 immediately returns to the steady state and starts continuous transmission of the broadcast information CCH. When the slave station 5 receives the system restart instruction UW2, it immediately returns to the steady state and continuously receives the broadcast information CCH. The relay station 4 stops transmission of the system restart instruction UW2 due to time-out by the timer of its own station, returns to the steady state, relays the notification information CCH from the master station 3, and continuously transmits it to the slave station 5.
[0031]
According to the second embodiment, since the master station 3 stops transmission in the power saving mode, continuous transmission of high power is unnecessary, greatly reducing power consumption and increasing battery drive efficiency in an emergency. The effect that can be obtained. In addition, the master station 3 stops the reception operation other than the intermittent reception operation for receiving the system restart instruction UW2 from the relay station 4 even in the reception in the power saving mode. An advantageous effect can be obtained. On the other hand, the relay station 4 can save power by performing no transmission / reception operation other than the intermittent reception operation for receiving the system restart request UW1 issued from the master station 3 and the slave station 5. In addition, the slave station 5 can save power by stopping the transmission / reception operation other than the intermittent reception operation for receiving the system restart instruction UW2 from the relay station 4. Therefore, it is possible to obtain an effect that enables significant power reduction in the entire wireless communication system including the master station 3, the relay station 4, and the slave station 5.
Further, according to the second embodiment, the relay station 5 is included both in the case of a request from the master station 3 and the request from an arbitrary slave station 5 in order to return the system from the power saving mode. Since restarting can be performed without any inconvenience, an effect of providing an optimum restarting method for power saving of the entire wireless communication system can be obtained.
[0032]
【The invention's effect】
As described above, according to the present invention, in a TDMA wireless communication system including a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations, and this power saving The terminal station that has received the mode transition instruction transmits its own station state and transition instruction confirmation to the base station, and then proceeds to an intermittent reception operation. The base station that has received the terminal station's own station state and transition instruction confirmation continuously transmits broadcast information. Is switched to the intermittent transmission operation that coincides with the timing of the intermittent reception operation of the terminal station and the operation is shifted to the intermittent reception operation. Therefore, the base station stops transmission other than intermittent transmission of the broadcast information in the power saving mode. In addition to discontinuous reception for receiving system restart requests, continuous power transmission is not required and power saving is achieved by stopping the reception to save battery power in an emergency. There is an effect that can raise rates.
In addition, the terminal station also has an effect of saving power by not performing the reception operation other than the intermittent reception operation that is synchronized with the intermittent transmission of the broadcast information from the base station. Therefore, there is an effect of enabling a great power reduction in the entire wireless communication system including the base station and the terminal station.
[0033]
According to the present invention, the parameter that allows the terminal station to recognize that it is in the power saving mode is included in the broadcast information intermittently transmitted from the base station and transmitted, and even when the terminal station receives the broadcast information, Even if there is a terminal station that could not receive the power saving mode transition instruction, it can be switched to the power saving mode from the time when the broadcast information is received afterwards. This has the effect of making the transition operation more reliable.
[0034]
According to the present invention, in a TDMA wireless communication system including a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations and receives the power saving mode transition instruction. The terminal station that has transmitted its own station status and transition instruction confirmation to the base station, and then proceeds to an intermittent reception operation, and the base station that has received the terminal station's own station status and transition instruction confirmation transmits the broadcast information continuously. Switch to intermittent transmission operation that coincides with the timing of reception operation and move to intermittent transmission / reception operation to form a power saving mode, and the base station receives a system restart instruction to multiple terminal stations for a predetermined period of time. Because it was configured to transmit to the operation timing and return to continuous transmission and reception operation, the terminal station received a system restart instruction during intermittent reception operation and returned to continuous reception operation. Restart for without inconvenience system by an instruction from the ground station returns from the power saving mode is performed, an effect that can provide an optimum restart method as due to power saving of the entire radio communication system.
[0035]
According to the present invention, in a TDMA wireless communication system including a base station and a plurality of terminal stations, the base station transmits a power saving mode transition instruction to the plurality of terminal stations and receives the power saving mode transition instruction. The terminal station that has transmitted its own station status and transition instruction confirmation to the base station, and then proceeds to an intermittent reception operation, and the base station that has received the terminal station's own station status and transition instruction confirmation transmits the broadcast information continuously. Switching to an intermittent transmission operation that matches the timing of the reception operation and moving to the intermittent transmission / reception operation to form a power saving mode, and any one of the plurality of terminal stations makes a call in accordance with the timing of the intermittent reception operation of the base station A system restart request for the base station is transmitted to the base station, and the base station that has received this system restart request instructs the system restart to all the terminal stations that are performing the intermittent reception operation. Since the terminal station that has received the system restart instruction is returned to the continuous transmission / reception operation by transmitting within the predetermined period and in accordance with the timing of the intermittent reception operation of the terminal station and returning to the continuous reception operation, Therefore, the system can be restarted to return from the power saving mode without any inconvenience, and there is an effect that an optimal restart method can be provided as the power saving of the entire wireless communication system.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a radio communication system according to Embodiment 1 of the present invention.
FIG. 2 is an explanatory diagram showing a connection sequence when shifting to a power saving mode in the first embodiment.
FIG. 3 is an explanatory diagram showing a connection sequence at the time of system restart in the first embodiment.
4 is an explanatory diagram showing a connection sequence at the time of system restart in the first embodiment. FIG.
FIG. 5 is a configuration diagram showing a radio communication system according to a second embodiment of the present invention.
FIG. 6 is an explanatory diagram showing a connection sequence when shifting to a power saving mode in the second embodiment.
FIG. 7 is an explanatory diagram showing a connection sequence at the time of system restart in the second embodiment.
FIG. 8 is an explanatory diagram showing a connection sequence at the time of system restart in the second embodiment.
FIG. 9 is a block diagram showing a conventional TDMA wireless communication system.
FIG. 10 is an explanatory diagram showing a control channel of a conventional TDMA wireless communication system.
[Explanation of symbols]
1 base station, 2 mobile station (terminal station), 3 master station, 4 relay station, 5 slave stations, 11, 31, 41 downlink control channel, 21, 42, 51 uplink control channel.

Claims (4)

基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、
前記基地局が複数の前記端末局に対して省電力モード移行指示を送信し、
この省電力モード移行指示を受信した前記端末局が自局状態および移行指示確認を前記基地局に送信した後間欠受信動作に移り、
前記端末局の自局状態および移行指示確認を受信した前記基地局が報知情報の連続送信を前記端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠受信動作に移ることを特徴とする無線通信システムの省電力モード移行方法。In a TDMA wireless communication system composed of a base station and a plurality of terminal stations,
The base station transmits a power saving mode transition instruction to a plurality of the terminal stations,
After the terminal station that has received this power saving mode transition instruction transmits its own station state and transition instruction confirmation to the base station, it proceeds to an intermittent reception operation,
The base station that has received the terminal station's own station status and transition instruction confirmation switches the continuous transmission of broadcast information to an intermittent transmission operation that coincides with the timing of the intermittent reception operation of the terminal station and moves to an intermittent reception operation. A method for shifting to a power saving mode of a wireless communication system. 省電力モードにあることを端末局が認識できるパラメータを基地局から間欠送信される報知情報に含めて送信し、前記端末局が前記報知情報を受信したときからでも省電力モードの間欠受信動作に移れるようにしたことを特徴とする請求項１記載の無線通信システムの省電力モード移行方法。  A parameter that allows the terminal station to recognize that it is in the power saving mode is included in the broadcast information that is intermittently transmitted from the base station, and the intermittent reception operation in the power saving mode is performed even when the terminal station receives the broadcast information. The method of shifting to a power saving mode of a wireless communication system according to claim 1, wherein the shift is possible. 基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、
前記基地局が複数の前記端末局に対して省電力モード移行指示を送信し、
この省電力モード移行指示を受信した前記端末局が自局状態および移行指示確認を前記基地局に送信した後間欠受信動作に移り、
前記端末局の自局状態および移行指示確認を受信した前記基地局が報知情報の連続送信を前記端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠送受信動作に移って省電力モードを形成し、
前記基地局が複数の前記端末局に対して所定の期間にシステム再起動指示を前記端末局の間欠受信動作のタイミングに合わせて送信して連続送受信動作に戻り、
前記端末局が間欠受信動作時に前記システム再起動指示を受信して連続受信動作に戻ることを特徴とする無線通信システムの再起動方法。In a TDMA wireless communication system composed of a base station and a plurality of terminal stations,
The base station transmits a power saving mode transition instruction to a plurality of the terminal stations,
After the terminal station that has received this power saving mode transition instruction transmits its own station state and transition instruction confirmation to the base station, it proceeds to an intermittent reception operation,
The base station that has received the terminal station's own station status and transition instruction confirmation switches the continuous transmission of broadcast information to an intermittent transmission operation that matches the timing of the intermittent reception operation of the terminal station, and moves to an intermittent transmission / reception operation to save power Forming mode,
The base station transmits a system restart instruction to the plurality of terminal stations in a predetermined period according to the timing of the intermittent reception operation of the terminal station, and returns to the continuous transmission / reception operation,
A method of restarting a wireless communication system, wherein the terminal station receives the system restart instruction during an intermittent reception operation and returns to a continuous reception operation. 基地局および複数の端末局から構成されるＴＤＭＡ無線通信システムにおいて、
前記基地局が複数の前記端末局に対して省電力モード移行指示を送信し、
この省電力モード移行指示を受信した前記端末局が自局状態および移行指示確認を前記基地局に送信した後間欠受信動作に移り、
前記端末局の自局状態および移行指示確認を受信した前記基地局が報知情報の連続送信を前記端末局の間欠受信動作のタイミングと一致する間欠送信動作に切り換えると共に間欠送受信動作に移って省電力モードを形成し、
複数の前記端末局のいずれか１局が、前記基地局の間欠受信動作のタイミングに合わせて発呼のためのシステム再起動要求を前記基地局に対して送信し、
このシステム再起動要求を受信した前記基地局が間欠受信動作中のすべての前記端末局に対してシステム再起動指示を所定の期間内にかつ前記端末局の間欠受信動作のタイミングに合わせて送信して連続送受信動作に戻り、
前記システム再起動指示を受信した前記端末局が連続受信動作に戻ることを特徴とする無線通信システムの再起動方法。In a TDMA wireless communication system composed of a base station and a plurality of terminal stations,
The base station transmits a power saving mode transition instruction to a plurality of the terminal stations,
After the terminal station that has received this power saving mode transition instruction transmits its own station state and transition instruction confirmation to the base station, it proceeds to an intermittent reception operation,
The base station that has received the terminal station's own station status and transition instruction confirmation switches the continuous transmission of broadcast information to an intermittent transmission operation that matches the timing of the intermittent reception operation of the terminal station, and moves to an intermittent transmission / reception operation to save power Forming mode,
Any one of the plurality of terminal stations transmits a system restart request for calling to the base station in accordance with the timing of the intermittent reception operation of the base station,
The base station that has received the system restart request transmits a system restart instruction within a predetermined period to all the terminal stations that are performing the intermittent reception operation in accordance with the timing of the intermittent reception operation of the terminal station. To return to continuous transmission and reception,
The wireless communication system restarting method, wherein the terminal station that has received the system restart instruction returns to a continuous reception operation.
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