JP3668062B2

JP3668062B2 - Wireless data communication method and wireless data communication system

Info

Publication number: JP3668062B2
Application number: JP23749499A
Authority: JP
Inventors: 友義大野; 竜治山本; 英生松木; 裕幸大塚
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 1999-08-24
Filing date: 1999-08-24
Publication date: 2005-07-06
Anticipated expiration: 2019-08-24
Also published as: JP2001061187A

Description

【０００１】
【発明の属する技術分野】
本発明は、複数の無線ゾーンでサービスエリアを構成する移動通信方式において無線回線の伝送速度の高速化および低速化に応じてダイナミックに無線基地局とデジタル交換機を接続する有線回線の伝送速度を可変にする無線データ通信方法および無線データ通信システムに関する。
【０００２】
【従来の技術】
従来のＰＨＳのデータ通信システムにおいては、一旦、３２kbit/sまたは６４kbit/sのデータ通信が開始された後は、データ伝送速度を変えることはできない。これは、ＰＨＳの有線回線部分にＩＳＤＮを利用しているため、現状のＩＳＤＮでは、通信中の伝送速度の変更ができないためである。
【０００３】
ＰＨＳの無線区間にプロトコルを規定している第二世代コードレス電話システム標準規格（RCR STD-28 3.2版平成11年２月２日改定社団法人電波産業会）において、有線回線は、６４kbit/sの伝送速度を維持したまま、無線回線の伝送速度を可変にするスロット可変型６４kbit/sデータ通信方法が規定されている。しかし、本方法では、無線区間は、３２kbit/sから６４kbit/sへ伝送速度の高速化が行われたり、６４kbit/sから３２kbit/sへ伝送速度の低速化が行われたりするが、有線区間は、一旦データ通信が開始された後は、上述したように、ＰＨＳの有線回線部分にＩＳＤＮを利用しているため、通信中の伝送速度の変更は行っていない。
【０００４】
【発明が解決しようとする課題】
現在の移動通信システムにおいてのデータ通信は、ＷＷＷアクセス、電子メール受信等、インターネット等に接続されるものが大半である。このようなデータ通信において、データは、バースト的に発生し、常時、確立した無線回線または有線回線の伝送路上をデータが送受信されている訳ではない。例えば、ＷＷＷアクセスにおいて、ユーザは、Ｗｅｂブラウザで情報を閲覧している時、伝送路は、確立しているが伝送路上で実際のデータは送受信されていない。このような状況では、伝送路の伝送速度の低速化、例えばＰＨＳのデータ通信の例では、６４kbit/sのデータ伝送速度の無線回線が確立している場合は、３２kbit/sのデータ伝送速度の無線回線に切り替えたり、ユーザ端末のＰＣへミドルウエア的なものを搭載し、無線回線を解放しても、上位アプリケーションに対して解放を通知せず、擬似的な接続環境を提供し、ネットワーク側の装置との協調制御により、無線回線、有線回線の伝送路を一時解放（伝送速度０kbit/sに等価）したりしないと、無線回線、有線回線の伝送路の利用効率が低下する問題がある。特に、ＰＨＳのデータ通信においては、無線回線のＴＤＭＡの１スロットの伝送速度が３２kbit/sであるため、６４kbit/sのデータ通信を行うためには、ＴＤＭＡスロットが２つ必要になり、高速なデータ伝送速度（例えば、６４kbit/s）を持った無線回線は、低速なデータ伝送速度（例えば、３２kbit/s）を持った無線回線に比べ、無線資源が多く必要になり、上述のように、データの送受信が行われていない状態で、高速な伝送速度を持った無線回線を保持することは、特に、無線資源の利用効率の著しい低下をもたらす問題が生じる。しかしながら、現状のＰＨＳシステムは、ＩＳＤＮを有線網として利用しているため、通信中に無線回線および有線回線の両方に対し、６４kbit/sのデータ伝送速度を３２kbit/sのデータ伝送速度の伝送路へ切り替えることはできない。
【０００５】
無線回線は、多数の移動局で共用しているため、特にＰＨＳのように、１基地局あたりの無線スロット数が３〜７と小さいシステムでは、通信中に接続先の無線基地局を切り替えるハンドオーバー時に、ハンドオーバー先の無線基地局の無線回線に空きスロットが無い場合、強制的に呼が切断されたりする場合がある。
【０００６】
例えば、無線スロットを２つ使用し、６４kbit/sのデータ通信をしている場合、ハンドオーバーが発生し、ハンドオーバー先の無線基地局の空きスロットが１つであった場合、６４kbit/sのデータ通信が維持できない。そこで、このような問題を解決するために、現在のＰＨＳの無線区間にプロトコルを規定している第二世代コードレス電話システム標準規格では、有線区間の伝送路のデータ伝送速度は、６４kbit/sにしたまま、無線スロットを２スロットから１スロットへ低減（伝送速度が６４kbit/sから３２kbit/sへ変化）し、データ通信を継続するスロット可変型６４kbit/sデータ通信方法が規定されている。しかしながら、この場合でも、無線区間の伝送路が３２kbit/sであるのに対して、有線区間の伝送路は、６４kbit/sの伝送速度を維持したままであるので、有線回線の利用効率が低下してしまうという問題点がある。
【０００７】
本発明は、上記に鑑みてなされたもので、その目的とするところは、無線回線の伝送路の伝送速度の変化に対応して有線回線の伝送路の伝送速度を変化することにより無線データ伝送を行う無線回線と有線回線の伝送路の利用効率を向上させる無線データ通信方法および無線データ通信システムを提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明の第１の特徴は、移動局と無線基地局の間では無線回線を介し、無線基地局とネットワークの間では有線回線を介してデータ伝送を行う無線データ通信システムにおいて、無線回線および有線回線の両伝送路の伝送速度を可変とし、一方の伝送速度の変化に対応して他方の伝送速度も変化することができることを要旨とする。
【０００９】
本発明の第１の特徴によると、無線回線および有線回線の両伝送路の伝送速度を可変とし、一方の伝送速度の変化に対応して他方の伝送速度も変化することができるため、無線回線および有線回線の両伝送路の伝送速度を最適化することができ、伝送路の利用効率を向上することができる。
【００１０】
本発明の第２の特徴は、無線基地局と移動局の間で無線回線を介し、更に無線基地局に接続されている基地局側信号処理装置とデジタル網内のデジタル交換機に接続されている網側信号処理装置が有線回線を介して接続され、双方向のデータ通信が行われ、網側信号処理装置はダイヤルアップルータ装置を介してルータ装置に接続され、該ルータ装置は専用線を介してＩＰ網に接続されている別のルータ装置に接続される無線データ通信システムにおいて、前記移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、前記移動局から前記無線基地局に対して無線回線の伝送速度の高速化要求が行われた時、当該移動局と当該無線基地局との間の無線回線の伝送路の数を増大し、伝送速度の高速化を行うとともに、当該無線基地局は、有線回線の制御線を介して基地局側信号処理装置に伝送速度の高速化要求信号を送出し、当該基地局側信号処理装置は、前記網側信号処理装置に有線回線の伝送速度の高速化要求を行う制御信号を送出し、当該制御信号を受信した前記網側信号処理装置が有線回線の伝送速度の高速化が可能である場合、当該網側信号処理装置は、伝送速度の高速化が可能であることを示す制御信号を前記基地局側信号処理装置に送出し、当該基地局側信号処理装置は、前記無線基地局に前記制御線を介して伝送速度の高速化が可能であることを示す制御信号を送出し、当該無線基地局と前記網側信号処理装置間の有線回線の伝送速度の高速化を行うことを要旨とする。
【００１１】
本発明の第２の特徴によると、移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、移動局から無線基地局に対して無線回線の伝送速度の高速化要求が行われた時、移動局と無線基地局との間の無線回線の伝送路の数を増大し、伝送速度の高速化を行い、無線基地局は基地局側信号処理装置に伝送速度の高速化要求信号を送出し、基地局側信号処理装置は網側信号処理装置に有線回線の伝送速度の高速化要求を行う制御信号を送出し、該制御信号を受信した網側信号処理装置が有線回線の伝送速度の高速化が可能である場合、網側信号処理装置は伝送速度の高速化が可能であることを示す制御信号を基地局側信号処理装置に送出し、基地局側信号処理装置は無線基地局に伝送速度の高速化が可能であることを示す制御信号を送出し、無線基地局と網側信号処理装置間の有線回線の伝送速度の高速化を行うため、無線回線の伝送路の伝送速度の高速化に対応して有線回線の伝送路の伝送速度を高速化して最適化でき、有線回線の利用効率を向上することができる。
【００１２】
また、本発明の第３の特徴は、無線基地局と移動局の間で無線回線を介し、更に無線基地局に接続されている基地局側信号処理装置とデジタル網内のデジタル交換機に接続されている網側信号処理装置が有線回線を介して接続され、双方向のデータ通信が行われ、網側信号処理装置はダイヤルアップルータ装置を介してルータ装置に接続され、該ルータ装置は専用線を介してＩＰ網に接続されている別のルータ装置に接続される無線データ通信システムにおいて、前記移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、前記移動局から前記無線基地局に対して無線回線の伝送速度の低速化要求が行われた時、当該移動局と当該無線基地局との間の無線回線の伝送路の数を低減し、伝送速度の低速化を行うとともに、当該無線基地局は、有線回線の制御線を介して基地局側信号処理装置に伝送速度の低速化要求信号を送出し、当該基地局側信号処理装置は、前記網側信号処理装置に有線回線の伝送速度の低速化要求を行う制御信号を送出し、当該制御信号を受信した前記網側信号処理装置は、有線回線の伝送速度の低速化を示す制御信号を前記基地局側信号処理装置に送出し、当該基地局側信号処理装置は、前記無線基地局に前記制御線を介して伝送速度の低速化が可能であることを示す制御信号を送出し、当該無線基地局と前記網側信号処理装置間の有線回線の伝送速度の低速化を行うことを要旨とする。
【００１３】
本発明の第３の特徴によると、移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、移動局から無線基地局に対して無線回線の伝送速度の低速化要求が行われた時、移動局と無線基地局との間の無線回線の伝送路の数を低減し、伝送速度の低速化を行い、無線基地局は基地局側信号処理装置に伝送速度の低速化要求信号を送出し、該基地局側信号処理装置は網側信号処理装置に有線回線の伝送速度の低速化要求を行う制御信号を送出し、該制御信号を受信した網側信号処理装置は有線回線の伝送速度の低速化を示す制御信号を基地局側信号処理装置に送出し、基地局側信号処理装置は無線基地局に伝送速度の低速化が可能であることを示す制御信号を送出し、無線基地局と網側信号処理装置間の有線回線の伝送速度の低速化を行うため、無線回線の伝送路の伝送速度の低速化に対応して有線回線の伝送路の伝送速度を低速化して最適化でき、有線回線の利用効率を向上することができる。
【００１４】
更に、本発明の第４の特徴は、無線基地局と無線回線を介して接続される移動局、無線基地局に接続されている基地局側信号処理装置、該基地局側信号処理装置に有線回線を介して接続されるデジタル網内のデジタル交換機に接続されている網側信号処理装置、インターネットなどに接続されているＩＰ網、前記網側信号処理装置にダイヤルアップルータ装置を介して接続されているルータ装置、および該ルータ装置に専用線を介して接続されるＩＰ網に接続されている別のルータ装置を有する無線データ通信システムにおいて、前記移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、前記移動局から前記無線基地局に対して無線回線の伝送速度の高速化要求が行われた時に、当該移動局と当該無線基地局との間の無線回線の伝送路の数を増大し、伝送速度の高速化を行うとともに、当該無線基地局は、有線回線の制御線を介して基地局側信号処理装置に伝送速度の高速化要求信号を送出し、当該基地局側信号処理装置は、前記網側信号処理装置に有線回線の伝送速度の高速化要求を行う制御信号を送出し、当該制御信号を受信した前記網側信号処理装置が有線回線の伝送速度の高速化が可能である場合、当該網側信号処理装置は、伝送速度の高速化が可能であることを示す制御信号を前記基地局側信号処理装置に送出し、当該基地局側信号処理装置は、前記無線基地局に前記制御線を介して伝送速度の高速化が可能であることを示す制御信号を送出し、当該無線基地局と前記網側信号処理装置間の有線回線の伝送速度の高速化を行うように構成されていることを要旨とする。
【００１５】
本発明の第４の特徴によると、移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、移動局から無線基地局に対して無線回線の伝送速度の高速化要求が行われた時、移動局と無線基地局との間の無線回線の伝送路の数を増大し、伝送速度の高速化を行い、無線基地局は基地局側信号処理装置に伝送速度の高速化要求信号を送出し、基地局側信号処理装置は網側信号処理装置に有線回線の伝送速度の高速化要求を行う制御信号を送出し、該制御信号を受信した網側信号処理装置が有線回線の伝送速度の高速化が可能である場合、網側信号処理装置は伝送速度の高速化が可能であることを示す制御信号を基地局側信号処理装置に送出し、基地局側信号処理装置は無線基地局に伝送速度の高速化が可能であることを示す制御信号を送出し、無線基地局と網側信号処理装置間の有線回線の伝送速度の高速化を行うため、無線回線の伝送路の伝送速度の高速化に対応して有線回線の伝送路の伝送速度を高速化して最適化でき、有線回線の利用効率を向上することができる。
【００１６】
本発明の第５の特徴は、無線基地局と無線回線を介して接続される移動局、無線基地局に接続されている基地局側信号処理装置、該基地局側信号処理装置に有線回線を介して接続されるデジタル網内のデジタル交換機に接続されている網側信号処理装置、インターネットなどに接続されているＩＰ網、前記網側信号処理装置にダイヤルアップルータ装置を介して接続されているルータ装置、および該ルータ装置に専用線を介して接続されるＩＰ網に接続されている別のルータ装置を有する無線データ通信システムにおいて、前記移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、前記移動局から前記無線基地局に対して無線回線の伝送速度の低速化要求が行われた時に、当該移動局と当該無線基地局との間の無線回線の伝送路の数を低減し、伝送速度の低速化を行うとともに、当該無線基地局は、有線回線の制御線を介して基地局側信号処理装置に伝送速度の低速化要求信号を送出し、当該基地局側信号処理装置は、前記網側信号処理装置に有線回線の伝送速度の低速化要求を行う制御信号を送出し、当該制御信号を受信した前記網側信号処理装置は、有線回線の伝送速度の低速化を示す制御信号を前記基地局側信号処理装置に送出し、当該基地局側信号処理装置は、前記無線基地局に前記制御線を介して伝送速度の低速化が可能であることを示す制御信号を送出し、当該無線基地局と前記網側信号処理装置間の有線回線の伝送速度の低速化を行うように構成されていることを要旨とする。
【００１７】
本発明の第５の特徴によると、移動局がＩＰ網に無線基地局、基地局側信号処理装置および網側信号処理装置を介してデータの送受信を行っている状態において、移動局から無線基地局に対して無線回線の伝送速度の低速化要求が行われた時、移動局と無線基地局との間の無線回線の伝送路の数を低減し、伝送速度の低速化を行い、無線基地局は基地局側信号処理装置に伝送速度の低速化要求信号を送出し、該基地局側信号処理装置は網側信号処理装置に有線回線の伝送速度の低速化要求を行う制御信号を送出し、該制御信号を受信した網側信号処理装置は有線回線の伝送速度の低速化を示す制御信号を基地局側信号処理装置に送出し、基地局側信号処理装置は無線基地局に伝送速度の低速化が可能であることを示す制御信号を送出し、無線基地局と網側信号処理装置間の有線回線の伝送速度の低速化を行うため、無線回線の伝送路の伝送速度の低速化に対応して有線回線の伝送路の伝送速度を低速化して最適化でき、有線回線の利用効率を向上することができる。
【００１８】
【発明の実施の形態】
以下、図面を用いて本発明の実施の形態を説明する。図１は、本発明の一実施形態に係る無線データ通信システムの構成を示す図である。同図に示す無線データ通信システムにおいては、データ通信端末１は、データ通信装置２を介して移動局３に接続され、移動局３からは無線回線を介して無線基地局４に接続されるように構成される。
【００１９】
また、無線基地局４からは、基地局側信号処理装置５、網側信号処理装置６、ダイヤルアップルータ装置９、ルータ装置１０、専用線１２、ルータ装置１１を介してＩＰ網１３に接続されている。また、ＩＰ網以外に接続される音声呼、Ｅｎｄ−Ｅｎｄで接続されるデータ通信呼の接続を可能とするために網側信号処理装置６からデジタル交換機７を介してデジタル網８へ接続される。
【００２０】
なお、上記構成において、データ通信端末１、データ通信装置２、および移動局３は、本発明の無線装置を構成するものであるが、この構成においてはデータ通信端末１内にデータ通信装置２が内蔵されていてもよいし、また、データ通信端末１、データ通信装置２および移動局３をすべて一装置としてまとめた一体型の無線装置を構成するものであってもよい。更に、データ通信端末１に移動局３の機能を内蔵し、例えばＰＤＡのような携帯情報端末のように構成してもよいものである。
【００２１】
また、無線基地局４は、基地局側信号処理装置５の機能を内蔵した構造でもよい。同様に、網側信号処理装置６も、ダイヤルアップルータ装置９の機能を内蔵し、網側信号処理装置６とルータ装置１０を直接接続できるような構成でもよいし、更には、ルータ装置１０の機能を内蔵し、網側信号処理装置を専用線に直接接続できる構成でもよい。
【００２２】
データ通信端末１は、具体的には、モバイルパソコンを表し、小型で携帯可能なパーソナルコンピュータである。データ通信装置２とダイヤルアップルータ装置９との間では、無線回線での通信品質の劣化が発生しても、両装置に実装されているデータ伝送プロトコルにより高品質にデータ伝送ができる。例えば、データ伝送プロトコルとしては、平成９年４月にＰＨＳインターネットアクセスフォーラムで標準化されたＰＩＡＦＳ（PHS Internet Access Forum Standard；ピアフ）などがある。
【００２３】
次に、図２を用いて呼接続シーケンスを説明する。以下、ここで対象にする無線システムは、ＰＨＳの例で説明する。今、移動局３から音声発信をすることを考える。音声通信のため、データ通信端末１およびデータ通信装置２は、ここでは使用しない。ユーザは移動局３の操作部から通信相手の番号を入力し、通話開始ボタンを押下する。移動局３から無線基地局４へ無線回線の確立要求処理を開始し、移動局３と無線基地局４の間で図２で示すように無線回線を確立する。無線回線の確立後、移動局３から呼設定信号を送出する。本信号は呼接続するための信号であり、本信号には、通信相手の番号だけでなく、呼の種別を表す情報が含まれている。移動局３から送出された呼設定信号を受信した無線基地局４は、移動局３へ呼設定受付信号を送出するとともに、基地局側信号処理装置５へ上記と同様に呼の種別を表す情報（ここでは音声）が含まれている呼設定信号を送出する。同様な手順で、基地局側信号処理装置５は網側信号処理装置６へ呼設定信号を送出する。網側信号処理装置６は、基地局側信号処理装置５へ返送するとともに、受信した呼設定信号から呼の種別を表す情報を取り出す。ここでは、呼の種別は音声であるので、網側信号処理装置６は、ダイヤルアップルータ装置９ではなく、デジタル交換機７へ呼設定信号を送出する。更に、呼設定信号は、デジタル網８を介して、移動局３の通信相手端末へ送られる。デジタル網８を介して接続されている移動局３の通信相手端末に着信して呼び出されると、当該通信相手端末から呼出信号が送出され、当該通信相手端末が応答すると応答信号が送出される。これらの信号は、デジタル網８、デジタル交換機７、網側信号処理装置６、基地局側信号処理装置５、無線基地局４を介して、移動局３へ送られ、Ｅｎｄ−Ｅｎｄで伝送路が開通し、通信が図２に示すように開始される。
【００２４】
以上は、音声通信の例であったが、次にデータ通信の例について図３を用いて呼接続シーケンスを説明する。ここでのデータ通信は、電子メール送受信、ＷＷＷアクセスに代表されるインターネットアクセスのようなＩＰ通信網へ接続するデータ通信を考える。企業のデータベース装置へ直接アクセスしたり、企業のファイルサーバへ直接アクセスするようなＥｎｄ−Ｅｎｄのデータ通信ではない。
【００２５】
このようなＥｎｄ−Ｅｎｄのデータ通信に関しては、後述する。
【００２６】
今、データ通信端末１からＩＰ網へ接続するデータ通信の発信を行うことを考える。上記音声通信のような通信相手の端末番号に相当するＩＰ網へ接続する着信番号をここでは、仮に１６６とする。ユーザはデータ通信端末１からデータ通信開始のコマンド等を入力し、データ通信の開始処理を行う。データ通信端末１から送出される呼接続要求信号は、図３に示すように、データ通信装置２を介して、移動局３へ送られる。当該呼接続要求信号には、着信番号の情報（ここでは１６６）と呼の種別を表す情報（ここでは、データ）が設定されている。移動局３から無線基地局４へ無線回線の確立要求処理を開始し、移動局３と無線基地局４の間で無線回線を図３のように確立する。無線回線の確立後、移動局３から着信番号の情報と呼の種別を表す情報をデータに設定し、呼設定信号を送出する。
【００２７】
移動局３から送出された呼設定信号を受信した無線基地局４は、移動局３へ呼設定受付信号を送出するとともに、基地局側信号処理装置５へ上記と同様に着信番号の情報（ここでは１６６）と呼の種別を表す情報（ここではデータ）が含まれている呼設定信号を送出する。同様な手順で、基地局側信号処理装置５は網側信号処理装置６へ呼設定信号を送出する。網側信号処理装置６は、呼設定受付信号を基地局側信号処理装置５へ返送するとともに、受信した呼設定信号から着信番号の情報と呼の種別を表す情報を取り出す。ここでは、着信番号は１６６、呼の種別はデータとなる。網側信号処理装置６は、着信番号が１６６であり、呼の種別がデータであるのを確認するとデジタル交換機７ではなく、ダイヤルアップルータ装置９へ呼設定信号を送出する。ここで、呼の種別がデータであっても、着信番号が１６６でなかった場合は、ＩＰ網へのデータ通信ではなく、Ｅｎｄ−Ｅｎｄのデータ通信であるので、その場合は、音声の処理と同じように、網側信号処理装置６は、ダイヤルアップルータ装置９ではなく、デジタル交換機７へ呼設定信号を送出する。この場合の呼接続シーケンスは、音声の呼接続と同様になる。以下、ＩＰ網への接続のシーケンスの説明を続ける。
【００２８】
呼設定信号を受信したダイヤルアップルータ装置９は、呼設定受付信号を送出し、更に応答信号を送出する。これらの信号は、網側信号処理装置６、基地局側信号処理装置５、無線基地局４を介して移動局３へ送られ、更に移動局３は、データ通信装置２を介して、データ通信端末１へ呼接続完了信号を送出し、データ通信端末１とＩＰ網１３は、移動局３、無線基地局４、基地局側信号処理装置５、網側信号処理装置６、ダイヤルアップルータ装置９、専用線１２を介して接続されているルータ装置１０とルータ装置１１を介して伝送路が開通し、通信が図３に示すように開始される。
【００２９】
以上述べたように、移動局側から送信される呼設定信号を受信した網側信号処理装置６は、当該呼設定信号の呼の種別と着信番号から判断し、デジタル交換機７側へ接続するかまたはダイヤルアップルータ装置９側へ接続するかという呼を振り分ける機能を有している。
【００３０】
更に、ＩＰ網１３へ接続されるデータ通信が行われる場合の無線回線確立を図４を用いて詳しく説明する。今、６４kbit/sの通信を行う場合を考える。移動局３は、無線基地局４に対して制御チャネル上でＬＣＨ（ＬｉｎｋＣｈａｎｎｅｌ：リンクチャネル）確立要求信号を送出する。当該無線基地局４は、通信品質を満足する無線チャネルの検索を行い、通信品質を満足する無線チャネルを前記移動局３に対してＬＣＨ割当信号で割り当てる。この時点で１スロットの無線回線の伝送路が確立する。ＰＨＳの場合、１スロットの伝送速度は、３２kbit/sであるため、６４kbit/sの伝送速度を実現するためには、無線回線の伝送路を２つ用いなければならない。そのため、もう１スロットの割当を無線基地局４からしてもらうために、前記移動局３は、無線基地局４へＴｃｈ（ＴｒａｆｆｉｃＣｈａｎｎｅｌ：通信チャネル）追加要求信号を送出する。１スロット目と同様に当該無線基地局４は、通信品質を満足する無線チャネルの検索を行い、通信品質を満足する無線チャネルを前記移動局３へＴｃｈ追加割当信号で割り当てる。このようにして、２つの伝送路を持った６４kbit/sの伝送速度の無線回線を移動局３と無線基地局４の間で確立することができる。その後は、図３に示したように、有線回線において、６４kbit/sの伝送路を確立する。
【００３１】
ここで、本発明の特徴となることは、有線回線の伝送路が、基地局側信号処理装置５と網側信号処理装置６の間で、無線回線と同様に、３２kbit/sの単位で伝送路が分割されていることである。その概念を図５に示す。ＰＨＳの場合、無線回線は、スロット単位に伝送路が分割され、スロット単位に無線回線の伝送路である無線チャネルが管理されている。図４のシーケンスを用いて、上述したように、１スロット毎に、無線回線の伝送路の割り当てを行い、例えば、６４kbit/sの伝送路の割り当てを行う場合には、無線基地局は、移動局に対して２スロットの割り当てを行う。
【００３２】
従来の無線回線の伝送路と有線回線の伝送路の関係を図６に示す。図６に示すように、図５との違いは、有線回線の伝送路が、図６の場合は、６４kbit/sであるのに対し、図５の場合は、３２kbit/sの単位で分割されている。図５のように、無線回線の伝送路と有線回線の伝送路を１対１に対応させる。このようにすることで、有線回線の伝送路の伝送速度と無線回線の伝送路の伝送速度が同一になるため、有線回線の利用効率を高めることが可能になる。以下、その事を詳しく述べる。
【００３３】
今、６４kbit/sのデータ通信が行われている状態で、移動局の移動に伴い、無線ゾーン間のハンドオーバーが起動されたことを考える。ハンドオーバー先の無線基地局において、割り当てられる無線回線のスロットが１つしか存在しなかった場合、従来のスロット可変型６４kbit/sデータ通信方法では、図７に示すような伝送路の状態になり、無線回線の伝送路の伝送速度が３２kbit/sであっても、有線回線の伝送路の伝送速度は６４kbit/sのままであり、有線回線の利用効率が低下する。この場合、有線回線の伝送路には、３２kbit/sは、無線回線の伝送路から受信されたユーザの有意なデータが転送されるが、残りの３２kbit/sには、意味のないデータ、例えば、オール（Ａｌｌ）１のようなＤｕｍｍｙデータが設定される。有線回線の伝送路の伝送速度が変えられないのは、ＰＨＳの有線網がＩＳＤＮをベースにしており、ＩＳＤＮ網では、通信中の伝送速度が変えられないからである。本発明の方法では、図８に示すように、基地局側信号処理装置５と網側信号処理装置６の間で、有線回線の伝送路が無線回線の伝送路と同じ３２kbit/sの単位になっているために、有線回線の利用効率が向上可能である。
【００３４】
以上、ハンドオーバーの時の例を述べたが、通信中にユーザの伝送するデータ量が変化した場合について述べる。３２kbit/sのデータ通信中に、データ量が増加し、伝送速度を高速化する場合について図９を用いて説明する。ユーザのデータ量が増加したため、移動局３は、無線回線の伝送速度の高速化を行うために、無線基地局４へＴｃｈ追加要求の信号を送出する。データ量を測定する手段は、データ通信端末１またはデータ通信装置２において、ある一定間隔で、データ線のデータの通過量を測定することで簡易に実現できる。Ｔｃｈ追加要求の信号を受信した無線基地局４は、無線回線としての所要品質を満足する空き無線スロットを検索し、所要品質を満足する無線スロットが存在する場合、当該無線スロットを移動局３へ割り当て、無線回線の伝送路の数を増加することで、伝送速度の高速化を実現する。無線基地局４は、空き無線スロットの検索を行うと同時に、有線回線の制御線を介して、基地局側信号処理装置５に対して伝送速度高速化要求信号を送出する。基地局側信号処理装置５は、網側信号処理装置６に対して、伝送速度高速化要求信号を送出する。本信号を受信した網側信号処理装置６は、有線回線の伝送速度の高速化が可能であるかどうか確認し、伝送速度の高速化が可能である場合には、基地局側信号処理装置５に対して伝送速度高速化完了信号を返信する。ここで言う有線回線の伝送速度の高速化とは、図８の有線回線の伝送路の伝送速度を３２kbit/sから、図５に示すように６４kbit/sにすることである。
【００３５】
更に伝送路を増加させることにより、更に高速なデータ通信が実現できる。従来のＰＨＳのデータ通信方法では、デジタル交換機７の機能の制限で６４kbit/sの通信が最大速度であったが、本方式では、デジタル交換機７の手前で伝送路を分岐してしまうため、交換機の機能の制約を受けないデータ通信が可能となる。
【００３６】
以上の説明は、ユーザ側からの要求による伝送速度の高速化であったが、網側信号処理装置６からの要求も可能である。
【００３７】
また、図９のシーケンスにおいて、伝送速度高速化要求信号は、網側信号処理装置６で終端されているが、終端せずにダイヤルアップルータ装置９まで透過させるようなシステム構成も可能である。ここでは、ダイヤルアップルータ装置９は既存の商用品を用いる例を考えており、網側信号処理装置６とダイヤルアップルータ装置９間は、ＩＳＤＮのインタフェースである。そのため、基地局側信号処理装置５と網側信号処理装置６間は、ダイナミックに有線回線の伝送速度が変化するが、網側信号処理装置６とダイヤルアップルータ装置９間は、６４kbit/sの伝送速度のままである。ダイヤルアップルータ装置９には、３２kbit/sのデータ通信においては、６４kbit/sのデータより３２kbit/sの有意データを取り出す機能が具備されており、その識別は、インチャネル信号により可能である。具体的には、ＰＨＳのデータ通信プロトコルのＰＩＡＦＳの機能で提供される。また、網側信号処理装置６とダイヤルアップルータ装置９間は、６４kbit/sの伝送速度のままであるので、有線回線の有効利用にならないように思われるが、本発明の主たる特徴は、デジタル交換機７と無線基地局４の間の有線回線の有効利用を目的としているので、本有線回線から分岐しているローカルな伝送路としての有線回線は、問題とならない。
【００３８】
逆に、６４kbit/sのデータ通信中に、データ量が減少し、伝送速度を低速化する場合について図１０を用いて説明する。ユーザのデータ量が低下したため、移動局３は、無線回線の伝送速度の低速化を行うために、無線基地局４へ無線チャネル切断完了の信号を送出する。この時点で、移動局３と無線基地局４間の無線回線の無線スロットは解放され、２スロットから１スロットになり、無線回線の伝送路の数が減少することで、伝送速度の低速化を実現する。無線基地局４は、無線スロットを解放すると同時に、有線回線の制御線を介して基地局側信号処理装置５に対して伝送速度低速化要求信号を送出する。基地局側信号処理装置５は、網側信号処理装置６に対して、伝送速度低速化要求信号を送出する。本信号を受信した網側信号処理装置６は、基地局側信号処理装置５と網側信号処理装置６間の伝送速度の低速化の処理を行い、基地局側信号処理装置５に対して伝送速度低速化完了信号を返信する。ここで言う有線回線の伝送速度の低速化とは、図５の有線回線の伝送路の伝送速度を６４kbit/sから、図８に示すように３２kbit/sにすることである。この場合も、網側信号処理装置６から伝送速度の低速化も可能である。
【００３９】
更に、３２kbit/sのデータ通信中に、データ量が減少した場合は、無線回線の無線スロットを１から０にし、事実上、無線回線を解放し、それに合わせて、有線回線の伝送路も解放する。その場合、データ通信端末１のミドルウエアまたはデータ通信装置２において、無線回線が解放されても、上位レイヤに対して、回線切断を通知しない仕組みを入れ、更にダイヤルアップルータ装置９または網側信号処理装置６において有線回線が解放されても、上位レイヤに対して、回線切断を通知しない仕組みを入れることができれば、データの送受信が行われないときに、無線回線および有線回線を解放することができるので、回線利用効率の向上が期待できる。
【００４０】
ルータ装置１０，１１、専用線１２は、ダイヤルアップルータ装置９で終端したデータ通信のＩＰパケットをＩＰ網１３へ接続するためのものである。データ通信呼数が少ない場合は、図１１のように、網側信号処理装置６からＩＳＤＮ等のデジタル回線１５でダイヤルアップルータ装置１４へ接続する形態も考えられる。図１の構成は、ＩＰ網１３への接続には、ルータ装置、専用線を用いてＩＰパケットを伝送しているが、その場合は、図１１と異なり、ＩＰパケットの多重化効果があるため、トラヒックが高い場合は、図１の方が図１１の構成よりも回線利用効率が高くなる利点がある。
【００４１】
【発明の効果】
以上説明したように、本発明によれば、無線回線の伝送路の伝送速度の高速化および低速化に対応して有線回線の伝送路の伝送速度を高速化および低速化して、無線回線および有線回線の伝送路の伝送速度を最適化することができるので、伝送路の利用効率を向上することができ、これによりシステム全体の収容加入者数の増大および呼の接続率の向上を図ることができ、経済的なネットワークを構築することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る無線データ通信システムの構成を示す図である。
【図２】図１の実施形態の無線データ通信システムにおける音声呼の接続シーケンスを示す図である。
【図３】図１の実施形態の無線データ通信システムにおけるデータ通信呼の接続シーケンスを示す図である。
【図４】図１の実施形態の無線データ通信システムにおける６４kbit/sデータ通信呼の接続シーケンスを示す図である。
【図５】図１の実施形態の無線データ通信システムにおいて６４kbit/sデータ通信における無線回線の伝送路と有線回線の伝送路の関係を示す図である。
【図６】従来の無線データ通信システムにおいて６４kbit/sデータ通信における無線回線の伝送路と有線回線の伝送路の関係を示す図である。
【図７】従来の無線データ通信システムにおいて３２kbit/sデータ通信における無線回線の伝送路と有線回線の伝送路の関係を示す図である。
【図８】図１の実施形態の無線データ通信システムにおいて３２kbit/sデータ通信における無線回線の伝送路と有線回線の伝送路の関係を示す図である。
【図９】図１の実施形態の無線データ通信システムにおいて３２kbit/sから６４kbit/sへデータ通信速度が高速化する時のシーケンスを示す図である。
【図１０】図１の実施形態の無線データ通信システムにおいて６４kbit/sから３２kbit/sへデータ通信速度が低速化する時のシーケンスを示す図である。
【図１１】本発明の他の実施形態に係る無線データ通信システムの構成を示す図である。
【符号の説明】
１データ通信端末
２データ通信装置
３移動局
４無線基地局
５基地局側信号処理装置
６網側信号処理装置
７デジタル交換機
８デジタル網
９，１４ダイヤルアップルータ装置
１０，１１ルータ装置
１２専用線
１３ＩＰ網
１５デジタル回線[0001]
BACKGROUND OF THE INVENTION
The present invention dynamically changes the transmission speed of a wired line connecting a wireless base station and a digital switch according to the increase or decrease of the transmission speed of a wireless line in a mobile communication system in which a service area is configured by a plurality of wireless zones. The present invention relates to a wireless data communication method and a wireless data communication system.
[0002]
[Prior art]
In the conventional PHS data communication system, once the 32 kbit / s or 64 kbit / s data communication is started, the data transmission rate cannot be changed. This is because the current ISDN cannot change the transmission speed during communication because the ISDN is used for the wired line portion of the PHS.
[0003]
In the second generation cordless telephone system standard (RCR STD-28 3.2 edition revised on February 2, 1999, Radio Industry Association), which defines the protocol for the PHS wireless section, the wired line is 64 kbit / s. A slot variable type 64 kbit / s data communication method is defined that allows the transmission rate of a wireless line to be varied while maintaining the transmission rate. However, in this method, the transmission speed of the wireless section is increased from 32 kbit / s to 64 kbit / s, or the transmission speed is decreased from 64 kbit / s to 32 kbit / s. Once the data communication is started, as described above, since the ISDN is used for the wired line portion of the PHS, the transmission speed during communication is not changed.
[0004]
[Problems to be solved by the invention]
Most of the data communication in the current mobile communication system is connected to the Internet, such as WWW access, e-mail reception, and the like. In such data communication, data is generated in bursts, and data is not always transmitted / received over a transmission path of an established wireless line or wired line. For example, in WWW access, when a user is browsing information on a Web browser, a transmission path is established, but actual data is not transmitted or received on the transmission path. In such a situation, the transmission speed of the transmission path is reduced, for example, in the case of PHS data communication, if a wireless line having a data transmission speed of 64 kbit / s is established, the data transmission speed of 32 kbit / s is reduced. Switching to a wireless line or installing middleware on the PC of a user terminal, providing a pseudo connection environment without notifying the upper application even if the wireless line is released, and the network side If the wireless and wired transmission paths are not temporarily released (equivalent to a transmission speed of 0 kbit / s) by cooperative control with the above devices, the utilization efficiency of the wireless and wired transmission paths will be reduced. . In particular, in the PHS data communication, since the transmission speed of one TDMA slot of a wireless line is 32 kbit / s, two TDMA slots are required to perform 64 kbit / s data communication. A wireless line having a data transmission rate (for example, 64 kbit / s) requires more wireless resources than a wireless line having a low data transmission rate (for example, 32 kbit / s). Maintaining a wireless line having a high transmission rate in a state where data is not being transmitted / received causes a problem that particularly causes a significant decrease in utilization efficiency of wireless resources. However, since the current PHS system uses ISDN as a wired network, a data transmission rate of 64 kbit / s is changed to a data transmission rate of 32 kbit / s for both a wireless line and a wired line during communication. You cannot switch to.
[0005]
Since a wireless line is shared by many mobile stations, especially in a system with a small number of wireless slots of 3 to 7 per base station, such as PHS, a hand for switching a connection-destination wireless base station during communication. If there is no empty slot in the radio channel of the handover destination radio base station at the time of over, the call may be forcibly disconnected.
[0006]
For example, if two radio slots are used and data communication of 64 kbit / s is performed, a handover occurs, and if there is one empty slot of the handover destination radio base station, 64 kbit / s Data communication cannot be maintained. Therefore, in order to solve such a problem, in the second generation cordless telephone system standard defining the protocol in the current PHS radio section, the data transmission speed of the transmission path in the wired section is set to 64 kbit / s. Thus, a slot variable type 64 kbit / s data communication method is defined in which the radio slot is reduced from 2 slots to 1 slot (transmission speed is changed from 64 kbit / s to 32 kbit / s) and data communication is continued. However, even in this case, the transmission path in the wireless section is 32 kbit / s, whereas the transmission path in the wired section still maintains the transmission speed of 64 kbit / s, so the utilization efficiency of the wired line is reduced. There is a problem that it will.
[0007]
The present invention has been made in view of the above, and an object of the present invention is to transmit wireless data by changing the transmission speed of the transmission line of the wired line in response to the change of the transmission speed of the transmission line of the wireless line. It is an object of the present invention to provide a wireless data communication method and a wireless data communication system that improve the utilization efficiency of a transmission line between a wireless line and a wired line.
[0008]
[Means for Solving the Problems]
To achieve the above objective, First feature of the present invention In a wireless data communication system that performs data transmission between a mobile station and a wireless base station via a wireless line, and between the wireless base station and a network via a wired line, transmission on both the transmission line of the wireless line and the wired line The gist is that the speed can be made variable, and the other transmission speed can be changed corresponding to the change of one transmission speed.
[0009]
According to a first aspect of the invention, Since the transmission speed of both the transmission line of the wireless line and the wired line can be made variable, and the transmission speed of the other line can be changed corresponding to the change of one transmission speed, the transmission speed of both the transmission line of the wireless line and the wired line can be changed. And the utilization efficiency of the transmission line can be improved.
[0010]
Second feature of the present invention The network side signal processing device connected to the base station side signal processing device connected to the wireless base station and the digital exchange in the digital network via a wireless line between the wireless base station and the mobile station is wired. Connected via a line, bi-directional data communication is performed, the network signal processing device is connected to the router device via a dial-up router device, and the router device is connected to the IP network via a dedicated line In a wireless data communication system connected to another router device, the mobile station transmits / receives data to / from the IP network via the wireless base station, the base station side signal processing device, and the network side signal processing device. , When a request to increase the transmission speed of the radio channel is made from the mobile station to the radio base station, the number of radio channel transmission paths between the mobile station and the radio base station is increased, Transmission speed The base station side signal processing apparatus sends out a speed increase request signal to the base station side signal processing apparatus via a wired control line, and the base station side signal processing apparatus When a control signal for requesting an increase in the transmission speed of the wired line is sent to the signal processing apparatus and the network side signal processing apparatus that has received the control signal can increase the transmission speed of the wired line, The side signal processing device sends a control signal indicating that the transmission speed can be increased to the base station side signal processing device, and the base station side signal processing device connects the control line to the radio base station. The gist is to transmit a control signal indicating that the transmission speed can be increased via the wireless base station and to increase the transmission speed of the wired line between the wireless base station and the network side signal processing device.
[0011]
According to a second aspect of the invention, In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, the transmission rate of the radio line from the mobile station to the radio base station When a request for speeding up is made, the number of wireless channel transmission paths between the mobile station and the wireless base station is increased, the transmission speed is increased, and the wireless base station transmits to the base station side signal processing device. The base station side signal processing device sends a control signal for requesting the high speed transmission of the wired line to the network side signal processing device, and receives the control signal. When the device can increase the transmission speed of the wired line, the network side signal processing device sends a control signal indicating that the transmission rate can be increased to the base station side signal processing device, and the base station side The signal processor can increase the transmission speed to the radio base station. Sends a control signal indicating that there is a wire line between the wireless base station and the network side signal processor to increase the transmission speed of the wired line. The transmission speed of the transmission line can be increased and optimized, and the utilization efficiency of the wired line can be improved.
[0012]
Also, Third feature of the present invention The network side signal processing device connected to the base station side signal processing device connected to the wireless base station and the digital exchange in the digital network via a wireless line between the wireless base station and the mobile station is wired. Connected via a line, bi-directional data communication is performed, the network signal processing device is connected to the router device via a dial-up router device, and the router device is connected to the IP network via a dedicated line In a wireless data communication system connected to another router device, the mobile station transmits / receives data to / from the IP network via the wireless base station, the base station side signal processing device, and the network side signal processing device. , When a request to reduce the transmission speed of the radio channel is made from the mobile station to the radio base station, the number of radio channel transmission paths between the mobile station and the radio base station is reduced, Transmission speed The base station side signal processing apparatus sends out a transmission speed reduction request signal to the base station side signal processing apparatus via the control line of the wired line. The network-side signal processing device that sends a control signal for requesting a reduction in the transmission speed of the wired line to the signal processing device, and receives the control signal, the control signal indicating the reduction in the transmission speed of the wired line is sent to the base The base station side signal processing apparatus sends a control signal indicating that the transmission speed can be reduced to the radio base station via the control line, and transmits the control signal to the radio base station. The gist is to reduce the transmission speed of a wired line between a station and the network side signal processing device.
[0013]
According to a third aspect of the invention, In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, the transmission rate of the radio line from the mobile station to the radio base station When a request for speed reduction is made, the number of transmission lines on the wireless link between the mobile station and the wireless base station is reduced, the transmission speed is reduced, and the wireless base station transmits to the base station side signal processor. The base station side signal processing apparatus sends a control signal for requesting a reduction in the transmission speed of the wired line to the network side signal processing apparatus and receives the control signal. The processing device sends a control signal indicating a decrease in the transmission speed of the wired line to the base station-side signal processing device, and the base station-side signal processing device controls the wireless base station to indicate that the transmission rate can be decreased. Sends the signal between the wireless base station and the network side signal processor Since the transmission speed of the wire line is reduced, the transmission speed of the wired line can be optimized by reducing the transmission speed of the wired line in response to the reduction of the transmission speed of the wireless line, improving the utilization efficiency of the wired line. can do.
[0014]
Furthermore, Fourth feature of the present invention A mobile station connected to a radio base station via a radio line, a base station side signal processing device connected to the radio base station, and a digital network connected to the base station side signal processing device via a wired line Network-side signal processing device connected to a digital switch in the network, an IP network connected to the Internet, a router device connected to the network-side signal processing device via a dial-up router device, and the router device In a wireless data communication system having another router device connected to an IP network connected via a dedicated line to the mobile station, the mobile station adds a wireless base station, a base station side signal processing device and a network side signal processing to the IP network. In a state where data is transmitted / received via a device, when the mobile station requests the radio base station to increase the transmission speed of the radio channel, the mobile station Increase the number of wireless channel transmission paths to and from the wireless base station, increase the transmission speed, and transmit the wireless base station to the signal processing device on the base station side via the wired control line The base station side signal processing device sends out a control signal for requesting an increase in the transmission speed of the wired line to the network side signal processing device and receives the control signal. When the network-side signal processing device can increase the transmission speed of the wired line, the network-side signal processing device sends a control signal indicating that the transmission speed can be increased to the base station-side signal processing device. The base station side signal processing apparatus sends a control signal indicating that transmission speed can be increased to the radio base station via the control line, and the radio base station and the network side Increased transmission speed of wired lines between signal processors It is summarized as that is configured to perform.
[0015]
According to a fourth aspect of the invention, In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, the transmission rate of the radio line from the mobile station to the radio base station When a request for speeding up is made, the number of wireless channel transmission paths between the mobile station and the wireless base station is increased, the transmission speed is increased, and the wireless base station transmits to the base station side signal processing device. The base station side signal processing device sends a control signal for requesting the high speed transmission of the wired line to the network side signal processing device, and receives the control signal. When the device can increase the transmission speed of the wired line, the network side signal processing device sends a control signal indicating that the transmission rate can be increased to the base station side signal processing device, and the base station side The signal processor can increase the transmission speed to the radio base station. Sends a control signal indicating that there is a wire line between the wireless base station and the network side signal processor to increase the transmission speed of the wired line. The transmission speed of the transmission line can be increased and optimized, and the utilization efficiency of the wired line can be improved.
[0016]
Fifth feature of the present invention A mobile station connected to a radio base station via a radio line, a base station side signal processing device connected to the radio base station, and a digital network connected to the base station side signal processing device via a wired line Network-side signal processing device connected to a digital switch in the network, an IP network connected to the Internet, a router device connected to the network-side signal processing device via a dial-up router device, and the router device In a wireless data communication system having another router device connected to an IP network connected via a dedicated line to the mobile station, the mobile station adds a wireless base station, a base station side signal processing device and a network side signal processing to the IP network. In a state where data is transmitted / received via a device, when the mobile station requests the wireless base station to reduce the transmission speed of the wireless line, the mobile station The number of wireless channel transmission paths with the wireless base station is reduced, the transmission speed is reduced, and the wireless base station transmits to the signal processing device on the base station side via the wired control line. The base station side signal processing device sends a control signal for requesting a reduction in the transmission speed of the wired line to the network side signal processing device, and the control signal is received. The network side signal processing device sends a control signal indicating a reduction in the transmission speed of the wired line to the base station side signal processing device, and the base station side signal processing device passes the control line to the radio base station. Sending a control signal indicating that the transmission speed can be reduced, and reducing the transmission speed of the wired line between the wireless base station and the network side signal processing device. The gist.
[0017]
According to a fifth aspect of the invention, In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, the transmission rate of the radio line from the mobile station to the radio base station When a request for speed reduction is made, the number of transmission lines on the wireless link between the mobile station and the wireless base station is reduced, the transmission speed is reduced, and the wireless base station transmits to the base station side signal processor. The base station side signal processing apparatus sends a control signal for requesting a reduction in the transmission speed of the wired line to the network side signal processing apparatus and receives the control signal. The processing device sends a control signal indicating a decrease in the transmission speed of the wired line to the base station-side signal processing device, and the base station-side signal processing device controls the wireless base station to indicate that the transmission rate can be decreased. Sends the signal between the wireless base station and the network side signal processor Since the transmission speed of the wire line is reduced, the transmission speed of the wired line can be optimized by reducing the transmission speed of the wired line in response to the reduction of the transmission speed of the wireless line, improving the utilization efficiency of the wired line. can do.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a wireless data communication system according to an embodiment of the present invention. In the wireless data communication system shown in the figure, the data communication terminal 1 is connected to the mobile station 3 via the data communication device 2 and is connected to the wireless base station 4 via the wireless line from the mobile station 3. Configured.
[0019]
Further, the radio base station 4 is connected to the IP network 13 through the base station side signal processing device 5, the network side signal processing device 6, the dial-up router device 9, the router device 10, the dedicated line 12, and the router device 11. ing. Further, in order to enable connection of a voice call connected to other than the IP network and a data communication call connected by End-End, the network side signal processing device 6 is connected to the digital network 8 via the digital exchange 7. .
[0020]
In the above configuration, the data communication terminal 1, the data communication device 2, and the mobile station 3 constitute the radio device of the present invention. In this configuration, the data communication device 2 is included in the data communication terminal 1. It may be built-in, or may constitute an integrated wireless device in which the data communication terminal 1, the data communication device 2, and the mobile station 3 are all combined as one device. Further, the function of the mobile station 3 is built in the data communication terminal 1 and may be configured as a portable information terminal such as a PDA.
[0021]
Further, the radio base station 4 may have a structure in which the function of the base station side signal processing device 5 is incorporated. Similarly, the network-side signal processing device 6 may also be configured so that the network-side signal processing device 6 and the router device 10 can be directly connected by incorporating the function of the dial-up router device 9. A configuration in which the function is built in and the network side signal processing device can be directly connected to the dedicated line may be employed.
[0022]
The data communication terminal 1 specifically represents a mobile personal computer, and is a small and portable personal computer. Between the data communication device 2 and the dial-up router device 9, even if the communication quality deteriorates over the wireless line, data transmission can be performed with high quality by the data transmission protocol installed in both devices. For example, as a data transmission protocol, there is PIAFS (PHS Internet Access Forum Standard; Piaf) standardized by the PHS Internet Access Forum in April 1997.
[0023]
Next, the call connection sequence will be described with reference to FIG. Hereinafter, the wireless system targeted here will be described using an example of PHS. Now, consider making a voice call from the mobile station 3. For voice communication, the data communication terminal 1 and the data communication apparatus 2 are not used here. The user inputs the communication partner number from the operation unit of the mobile station 3 and presses the call start button. A process for requesting establishment of a radio channel from the mobile station 3 to the radio base station 4 is started, and a radio channel is established between the mobile station 3 and the radio base station 4 as shown in FIG. After establishing the wireless line, the mobile station 3 sends a call setting signal. This signal is a signal for call connection, and this signal includes not only the communication partner number but also information indicating the type of call. The radio base station 4 that has received the call setup signal sent from the mobile station 3 sends a call setup acceptance signal to the mobile station 3 and also represents information indicating the call type to the base station side signal processing device 5 as described above. A call setting signal including (voice here) is transmitted. The base station side signal processing device 5 sends a call setting signal to the network side signal processing device 6 in the same procedure. The network-side signal processing device 6 returns to the base station-side signal processing device 5 and extracts information indicating the call type from the received call setting signal. Here, since the call type is voice, the network side signal processing device 6 sends a call setting signal to the digital exchange 7 instead of the dial-up router device 9. Further, the call setting signal is sent to the communication partner terminal of the mobile station 3 via the digital network 8. When the communication partner terminal of the mobile station 3 connected via the digital network 8 is received and called, a call signal is transmitted from the communication partner terminal, and a response signal is transmitted when the communication partner terminal responds. These signals are sent to the mobile station 3 via the digital network 8, the digital switch 7, the network side signal processing device 6, the base station side signal processing device 5, and the radio base station 4, and the transmission path is End-End. Opening and communication is started as shown in FIG.
[0024]
The above is an example of voice communication. Next, a call connection sequence will be described with reference to FIG. 3 for an example of data communication. The data communication here considers data communication connected to an IP communication network such as Internet access represented by e-mail transmission / reception and WWW access. It is not End-End data communication that directly accesses a corporate database device or directly accesses a corporate file server.
[0025]
Such end-end data communication will be described later.
[0026]
Now, consider the transmission of data communication connected from the data communication terminal 1 to the IP network. Here, the incoming number connected to the IP network corresponding to the terminal number of the communication partner such as the voice communication is assumed to be 166 here. The user inputs a data communication start command or the like from the data communication terminal 1 and performs data communication start processing. The call connection request signal sent from the data communication terminal 1 is sent to the mobile station 3 via the data communication device 2 as shown in FIG. In the call connection request signal, information on the incoming call number (here, 166) and information indicating the type of call (here, data) are set. A process for requesting establishment of a radio channel from the mobile station 3 to the radio base station 4 is started, and a radio channel is established between the mobile station 3 and the radio base station 4 as shown in FIG. After establishing the wireless line, the mobile station 3 sets information on the incoming call number and information indicating the call type in the data, and sends a call setting signal.
[0027]
The radio base station 4 that has received the call setting signal transmitted from the mobile station 3 transmits a call setting acceptance signal to the mobile station 3 and also receives information on the incoming call number (here) to the base station side signal processing device 5. 166) and a call setting signal including information (here, data) indicating the call type is transmitted. The base station side signal processing device 5 sends a call setting signal to the network side signal processing device 6 in the same procedure. The network side signal processing device 6 returns a call setting acceptance signal to the base station side signal processing device 5 and extracts information on the incoming call number and information indicating the call type from the received call setting signal. Here, the incoming call number is 166, and the call type is data. When the network-side signal processing device 6 confirms that the incoming call number is 166 and the call type is data, the network-side signal processing device 6 sends a call setting signal to the dial-up router device 9 instead of the digital exchange 7. Here, even if the call type is data, if the incoming call number is not 166, it is not data communication to the IP network but end-end data communication. Similarly, the network side signal processing device 6 sends a call setting signal to the digital exchange 7 instead of the dial-up router device 9. The call connection sequence in this case is the same as the voice call connection. Hereinafter, the description of the sequence of connection to the IP network will be continued.
[0028]
The dial-up router device 9 that has received the call setting signal transmits a call setting acceptance signal and further transmits a response signal. These signals are sent to the mobile station 3 via the network side signal processing device 6, the base station side signal processing device 5, and the radio base station 4, and the mobile station 3 further performs data communication via the data communication device 2. A call connection completion signal is transmitted to the terminal 1, and the data communication terminal 1 and the IP network 13 are connected to the mobile station 3, the radio base station 4, the base station side signal processing device 5, the network side signal processing device 6, and the dial-up router device 9. Then, the transmission path is opened via the router device 10 and the router device 11 connected via the dedicated line 12, and communication is started as shown in FIG.
[0029]
As described above, the network-side signal processing device 6 that has received the call setting signal transmitted from the mobile station side determines from the call type and the incoming call number of the call setting signal and connects to the digital exchange 7 side. Alternatively, it has a function of distributing a call to connect to the dial-up router device 9 side.
[0030]
Further, the establishment of a wireless line when data communication connected to the IP network 13 is performed will be described in detail with reference to FIG. Consider a case where 64 kbit / s communication is performed. The mobile station 3 transmits an LCH (Link Channel) establishment request signal on the control channel to the radio base station 4. The radio base station 4 searches for a radio channel satisfying the communication quality, and allocates a radio channel satisfying the communication quality to the mobile station 3 using an LCH allocation signal. At this point, a one-slot wireless channel transmission path is established. In the case of PHS, since the transmission speed of one slot is 32 kbit / s, in order to realize a transmission speed of 64 kbit / s, two transmission lines of a wireless line must be used. Therefore, the mobile station 3 transmits a Tch (Traffic Channel) addition request signal to the radio base station 4 in order to have the radio base station 4 allocate another slot. Similar to the first slot, the radio base station 4 searches for radio channels satisfying the communication quality, and allocates radio channels satisfying the communication quality to the mobile station 3 using the Tch additional allocation signal. In this way, a radio channel having a transmission speed of 64 kbit / s having two transmission paths can be established between the mobile station 3 and the radio base station 4. Thereafter, as shown in FIG. 3, a 64 kbit / s transmission path is established in the wired line.
[0031]
Here, the feature of the present invention is that the transmission line of the wired line is transmitted between the base station side signal processing device 5 and the network side signal processing device 6 in the unit of 32 kbit / s, like the wireless line. The road is divided. The concept is shown in FIG. In the case of PHS, a transmission line of a wireless line is divided in slot units, and a wireless channel that is a transmission line of the wireless line is managed in slot units. As described above, using the sequence of FIG. 4, as described above, radio channel transmission paths are allocated for each slot. For example, when a 64 kbit / s transmission path is allocated, the radio base station moves 2 slots are allocated to the station.
[0032]
FIG. 6 shows the relationship between a conventional wireless line transmission line and a wired line transmission line. As shown in FIG. 6, the difference with FIG. 5 is that the transmission line of the wired line is 64 kbit / s in the case of FIG. 6, whereas in FIG. 5, it is divided in units of 32 kbit / s. ing. As shown in FIG. 5, the transmission line of the wireless line and the transmission line of the wired line are made to correspond one-to-one. By doing so, the transmission speed of the wired line and the transmission speed of the wireless line become the same, so that the utilization efficiency of the wired line can be increased. This will be described in detail below.
[0033]
Now, it is considered that handover between radio zones is activated in accordance with movement of a mobile station in a state where data communication of 64 kbit / s is being performed. In the handover destination radio base station, if there is only one slot for the assigned radio channel, the conventional slot variable type 64 kbit / s data communication method results in a transmission path state as shown in FIG. Even if the transmission speed of the transmission line of the wireless line is 32 kbit / s, the transmission speed of the transmission line of the wired line remains 64 kbit / s, and the utilization efficiency of the wired line is reduced. In this case, significant data of the user received from the transmission line of the wireless line is transferred to the transmission line of the wired line at 32 kbit / s, but meaningless data such as, for example, the remaining 32 kbit / s, for example, Dummy data such as All 1 is set. The reason why the transmission speed of the wired transmission line cannot be changed is that the PHS wired network is based on ISDN, and the transmission speed during communication cannot be changed in the ISDN network. In the method of the present invention, as shown in FIG. 8, between the base station side signal processing device 5 and the network side signal processing device 6, the transmission line of the wired line is set to the same unit of 32 kbit / s as the transmission line of the wireless line. Therefore, the use efficiency of the wired line can be improved.
[0034]
The example at the time of handover has been described above, but the case where the amount of data transmitted by the user changes during communication will be described. A case where the amount of data increases and the transmission speed is increased during 32 kbit / s data communication will be described with reference to FIG. Since the amount of user data has increased, the mobile station 3 sends a Tch addition request signal to the radio base station 4 in order to increase the transmission speed of the radio channel. The means for measuring the amount of data can be easily realized by measuring the amount of data passing through the data line at a certain interval in the data communication terminal 1 or the data communication device 2. The radio base station 4 that has received the Tch addition request signal searches for a free radio slot that satisfies the required quality of the radio channel, and if there is a radio slot that satisfies the required quality, the radio slot is transferred to the mobile station 3. The transmission speed is increased by increasing the number of allocation and transmission lines of the radio line. The radio base station 4 searches for an empty radio slot and simultaneously transmits a transmission speed acceleration request signal to the base station side signal processing device 5 through a wired control line. The base station side signal processing device 5 sends a transmission speed acceleration request signal to the network side signal processing device 6. The network-side signal processing device 6 that has received this signal confirms whether the transmission speed of the wired line can be increased. If the transmission speed can be increased, the base-station-side signal processing device 5 In response to the transmission speed acceleration completion signal. The increase in the transmission speed of the wired line here means that the transmission speed of the transmission path of the wired line in FIG. 8 is changed from 32 kbit / s to 64 kbit / s as shown in FIG.
[0035]
Further, by increasing the number of transmission lines, higher-speed data communication can be realized. In the conventional PHS data communication method, the communication speed of 64 kbit / s is the maximum speed due to the limitation of the function of the digital switch 7. However, in this method, the transmission path is branched before the digital switch 7, so the switch Data communication that is not restricted by the functions of
[0036]
Although the above explanation has been made to increase the transmission speed in response to a request from the user side, a request from the network side signal processing device 6 is also possible.
[0037]
In the sequence of FIG. 9, the transmission speed acceleration request signal is terminated at the network-side signal processing device 6, but a system configuration that allows transmission to the dial-up router device 9 without termination is also possible. Here, an example in which an existing commercial product is used as the dial-up router device 9 is considered, and an ISDN interface is provided between the network-side signal processing device 6 and the dial-up router device 9. Therefore, the transmission speed of the wired line dynamically changes between the base station side signal processing device 5 and the network side signal processing device 6, but between the network side signal processing device 6 and the dial-up router device 9 is 64 kbit / s. The transmission speed remains unchanged. The dial-up router device 9 has a function of extracting 32 kbit / s significant data from 64 kbit / s data in 32 kbit / s data communication, and the identification is possible by an in-channel signal. Specifically, it is provided by the PIAFS function of the PHS data communication protocol. Further, since the transmission speed between the network side signal processing device 6 and the dial-up router device 9 remains at 64 kbit / s, it seems that the wired line is not effectively used. Since the purpose is to use the wired line between the exchange 7 and the radio base station 4 effectively, the wired line as a local transmission line branched from the wired line is not a problem.
[0038]
On the contrary, the case where the data amount decreases during the 64 kbit / s data communication and the transmission speed is reduced will be described with reference to FIG. Since the user data amount has decreased, the mobile station 3 sends a radio channel disconnection completion signal to the radio base station 4 in order to reduce the transmission speed of the radio channel. At this time, the radio slot of the radio channel between the mobile station 3 and the radio base station 4 is released, and the slot is changed from 2 slots to 1 slot, and the number of radio channel transmission paths is reduced, thereby reducing the transmission speed. Realize. The radio base station 4 releases the radio slot and simultaneously transmits a transmission speed reduction request signal to the base station side signal processing device 5 through the control line of the wired line. The base station side signal processing device 5 sends a transmission speed reduction request signal to the network side signal processing device 6. The network-side signal processing device 6 that has received this signal performs processing for reducing the transmission speed between the base station-side signal processing device 5 and the network-side signal processing device 6, and transmits it to the base station-side signal processing device 5. A speed reduction completion signal is returned. Here, the reduction in the transmission speed of the wired line means that the transmission speed of the transmission line of the wired line in FIG. 5 is changed from 64 kbit / s to 32 kbit / s as shown in FIG. Also in this case, it is possible to reduce the transmission speed from the network side signal processing device 6.
[0039]
Furthermore, if the amount of data decreases during 32 kbit / s data communication, the wireless slot of the wireless line is changed from 1 to 0, effectively releasing the wireless line, and the transmission line of the wired line is also released accordingly. To do. In that case, in the middleware of the data communication terminal 1 or the data communication device 2, even if the wireless line is released, a mechanism is provided that does not notify the upper layer of line disconnection, and the dial-up router device 9 or the network side signal Even if the wired line is released in the processing device 6, the wireless line and the wired line can be released when data transmission / reception is not performed if a mechanism that does not notify the upper layer of the line disconnection can be inserted. As a result, improvement in line utilization efficiency can be expected.
[0040]
The router devices 10 and 11 and the dedicated line 12 are used to connect the data communication IP packet terminated at the dial-up router device 9 to the IP network 13. When the number of data communication calls is small, as shown in FIG. 11, a form in which the network side signal processing device 6 is connected to the dial-up router device 14 through the digital line 15 such as ISDN is also conceivable. In the configuration of FIG. 1, IP packets are transmitted using a router device and a dedicated line for connection to the IP network 13, but in this case, unlike FIG. 11, there is an IP packet multiplexing effect. When the traffic is high, FIG. 1 has the advantage of higher line utilization efficiency than the configuration of FIG.
[0041]
【The invention's effect】
As described above, according to the present invention, the transmission speed of the transmission line of the wired line is increased and decreased in response to the increase and decrease of the transmission speed of the transmission line of the wireless line, so Since the transmission speed of the line transmission line can be optimized, the use efficiency of the transmission line can be improved, thereby increasing the number of subscribers accommodated in the entire system and improving the call connection rate. And an economical network can be constructed.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a wireless data communication system according to an embodiment of the present invention.
FIG. 2 is a diagram showing a voice call connection sequence in the wireless data communication system of the embodiment of FIG. 1;
3 is a diagram showing a data communication call connection sequence in the wireless data communication system of the embodiment of FIG. 1; FIG.
4 is a diagram showing a connection sequence of a 64 kbit / s data communication call in the wireless data communication system of the embodiment of FIG. 1. FIG.
5 is a diagram showing a relationship between a wireless line transmission line and a wired line transmission line in 64 kbit / s data communication in the wireless data communication system according to the embodiment of FIG. 1; FIG.
FIG. 6 is a diagram illustrating a relationship between a transmission line of a wireless line and a transmission line of a wired line in 64 kbit / s data communication in a conventional wireless data communication system.
FIG. 7 is a diagram showing a relationship between a transmission line of a wireless line and a transmission line of a wired line in 32 kbit / s data communication in a conventional wireless data communication system.
8 is a diagram showing a relationship between a wireless line transmission line and a wired line transmission line in 32 kbit / s data communication in the wireless data communication system according to the embodiment of FIG. 1;
9 is a diagram showing a sequence when the data communication speed is increased from 32 kbit / s to 64 kbit / s in the wireless data communication system of the embodiment of FIG. 1; FIG.
10 is a diagram showing a sequence when the data communication speed is reduced from 64 kbit / s to 32 kbit / s in the wireless data communication system of the embodiment of FIG. 1; FIG.
FIG. 11 is a diagram showing a configuration of a wireless data communication system according to another embodiment of the present invention.
[Explanation of symbols]
1 Data communication terminal
2 Data communication equipment
3 Mobile stations
4 radio base stations
5 Base station side signal processor
6 Network side signal processor
7 Digital switch
8 Digital network
9,14 Dial-up router device
10,11 router device
12 Private line
13 IP network
15 Digital line

Claims

The base station side signal processing device connected to the radio base station and the network side signal processing device connected to the digital exchange in the digital network via the radio line between the radio base station and the mobile station are connected to the wired line. The network side signal processing device is connected to the router device via a dial-up router device, and the router device is connected to the IP network via a dedicated line. In the wireless data communication system connected to the router device of
In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, a radio channel is connected from the mobile station to the radio base station. When a request to increase the transmission speed is made, the number of wireless channel transmission paths between the mobile station and the wireless base station is increased, and the transmission speed is increased.
The wireless base station sends a transmission speed increase request signal to the base station side signal processing device via a wired line control line, and the base station side signal processing device sends a wired line to the network side signal processing device. Send a control signal to request a higher transmission speed of
When the network-side signal processing device that has received the control signal can increase the transmission speed of the wired line, the network-side signal processing device receives a control signal indicating that the transmission speed can be increased. Sending to the base station side signal processing device, the base station side signal processing device sends a control signal indicating that the transmission speed can be increased to the radio base station via the control line,
A wireless data communication method, comprising: increasing a transmission speed of a wired line between the wireless base station and the network-side signal processing device.

The base station side signal processing device connected to the radio base station and the network side signal processing device connected to the digital exchange in the digital network via the radio line between the radio base station and the mobile station are connected to the wired line. The network side signal processing device is connected to the router device via a dial-up router device, and the router device is connected to the IP network via a dedicated line. In the wireless data communication system connected to the router device of
In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, a radio channel is connected from the mobile station to the radio base station. When a transmission speed reduction request is made, the number of wireless channel transmission paths between the mobile station and the wireless base station is reduced, and the transmission speed is reduced.
The wireless base station sends a transmission speed reduction request signal to the base station side signal processing device via the wired line control line, and the base station side signal processing device sends a wired line to the network side signal processing device. Send a control signal to request a reduction in the transmission speed of
The network-side signal processing device that has received the control signal sends a control signal indicating a reduction in the transmission speed of the wired line to the base station-side signal processing device, and the base station-side signal processing device Sending a control signal indicating that the transmission speed can be reduced to the station via the control line,
A wireless data communication method comprising: reducing a transmission speed of a wired line between the wireless base station and the network side signal processing device.

A mobile station connected to a wireless base station via a wireless line, a base station side signal processing device connected to the wireless base station, and a digital network connected to the base station side signal processing device via a wired line A network-side signal processing device connected to a digital exchange, an IP network connected to the Internet, a router device connected to the network-side signal processing device via a dial-up router device, and a dedicated router device In a wireless data communication system having another router device connected to an IP network connected via a line,
In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, a radio channel is connected from the mobile station to the radio base station. When a request to increase the transmission speed is made, the number of wireless channel transmission paths between the mobile station and the wireless base station is increased, and the transmission speed is increased.
The wireless base station sends a transmission speed increase request signal to the base station side signal processing device via a wired line control line, and the base station side signal processing device sends a wired line to the network side signal processing device. Send a control signal to request a higher transmission speed of
When the network-side signal processing device that has received the control signal can increase the transmission speed of the wired line, the network-side signal processing device receives a control signal indicating that the transmission speed can be increased. Sending to the base station side signal processing device, the base station side signal processing device sends a control signal indicating that the transmission speed can be increased to the radio base station via the control line,
A wireless data communication system configured to increase the transmission speed of a wired line between the wireless base station and the network-side signal processing device.

A mobile station connected to a wireless base station via a wireless line, a base station side signal processing device connected to the wireless base station, and a digital network connected to the base station side signal processing device via a wired line A network-side signal processing device connected to a digital exchange, an IP network connected to the Internet, a router device connected to the network-side signal processing device via a dial-up router device, and a dedicated router device In a wireless data communication system having another router device connected to an IP network connected via a line,
In a state where the mobile station is transmitting / receiving data to / from the IP network via the radio base station, the base station side signal processing device, and the network side signal processing device, a radio channel is connected from the mobile station to the radio base station. When a transmission speed reduction request is made, the number of wireless channel transmission paths between the mobile station and the wireless base station is reduced, and the transmission speed is reduced.
The wireless base station sends a transmission speed reduction request signal to the base station side signal processing device via the wired line control line, and the base station side signal processing device sends a wired line to the network side signal processing device. Send a control signal to request a reduction in the transmission speed of
The network-side signal processing device that has received the control signal sends a control signal indicating a reduction in the transmission speed of the wired line to the base station-side signal processing device, and the base station-side signal processing device Sending a control signal indicating that the transmission speed can be reduced to the station via the control line,
A wireless data communication system configured to reduce the transmission speed of a wired line between the wireless base station and the network-side signal processing device.