JP3613384B2 - Wireless communication system, wireless channel allocation method, and wireless relay device - Google Patents

Wireless communication system, wireless channel allocation method, and wireless relay device Download PDF

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JP3613384B2
JP3613384B2 JP22946199A JP22946199A JP3613384B2 JP 3613384 B2 JP3613384 B2 JP 3613384B2 JP 22946199 A JP22946199 A JP 22946199A JP 22946199 A JP22946199 A JP 22946199A JP 3613384 B2 JP3613384 B2 JP 3613384B2
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radio
base station
terminal
communication channel
wireless
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JP2001053673A (en
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隆之 石黒
修 中村
順進 有川
友義 大野
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NTT Docomo Inc
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【０００１】
【発明の属する技術分野】
本発明は、無線通信システム、無線チャネル割当方法及び無線中継装置に係り、特に、無線基地局と無線端末と無線中継装置とから構成され、無線端末と無線基地局との間で無線中継装置を介することによって通信を行う無線通信システム、無線チャネル割当方法及び無線中継装置に関する。
【０００２】
【従来の技術】
図１は、従来の無線通信システムの構成例を示すものである。無線端末１０と、無線端末１０と無線チャネルで接続される無線中継装置２０と、無線中継装置２０と無線チャネルで接続される無線基地局３０とで構成される。無線基地局３０は、他の無線基地局又はＰＳＴＮ（Ｐｕｂｌｉｃ Ｓｗｉｔｃｈｅｄ Ｔｅｌｅｐｈｏｎｅ Ｎｅｔｗｏｒｋ： 公衆電話網）、ＩＳＤＮ（Ｉｎｔｅｇｒａｔｅｄ Ｓｅｒｖｉｃｅｓ Ｄｉｇｉｔａｌ Ｎｅｔｗｏｒｋ ：統合サービスディジタル通信網）、インターネット等の交換局、ルータ等に接続されている。
【０００３】
この従来の無線通信システムでの無線チャネル割当方法のシーケンスを図６を用いて説明する。図６は、ＰＨＳ（Ｐｅｒｓｏｎａｌ Ｈａｎｄｙ−ｐｈｏｎｅ Ｓｙｓｔｅｍ）を用いて６４ｋ無線通信を行う場合を示している。
無線端末１０は、発信時に無線端末側の第１の通信チャネル（以下、「端末側第１ＴＣＨ」という。）の割当のためのＬＣＨ（リンクチャネル）確立要求信号を無線中継装置２０に送信する（１０１）。
【０００４】
無線中継装置２０は、無線端末１０からの端末側第１ＴＣＨの割当のためのＬＣＨ確立要求信号を受信すると、無線基地局３０に対して無線基地局側の第１の通信チャネル（以下、「基地局側第１ＴＣＨ」という。）の割当のためにＬＣＨ確立要求信号を送信する（１０２）。
無線基地局３０は、無線中継装置２０からＬＣＨ確立要求信号を受信すると、無線基地局３０で使用していない通信チャネルを無線中継装置２０に対して基地局側第１ＴＣＨとして割り当て、割り当てたチャネル（以下、「割当チャネル」という。）をＬＣＨ割当信号によって無線中継装置２０に通知する（１０３）。
【０００５】
無線中継装置２０は、無線基地局３０から割り当てられた基地局側第１ＴＣＨが使用可能であれば、基地局側第１ＴＣＨにおいて、無線基地局３０との通信チャネルを確立する（１０４）。
そして、基地局側第１ＴＣＨ以外の通信チャネルを端末側第１ＴＣＨとして無線端末１０に割り当て、無線端末１０にＬＣＨ割当信号によって通知する（１０５）。
【０００６】
無線端末１０は、無線中継装置２０からＬＣＨ割当信号を受信すると、端末側第１ＴＣＨにおいて、無線中継装置２０との通信チャネルを確立する（１０６）。
そして、無線中継装置２０に無線端末１０側の第２の通信チャネル（以下、「端末側第２ＴＣＨ」という。）の割当を要求するためにＴＣＨ追加要求信号を無線中継装置２０に送信する（１０７）。
【０００７】
無線中継装置２０は、無線端末１０からのＴＣＨ追加要求信号を受信すると、無線基地局３０に対して無線基地局側の第２の通信チャネル（以下、「基地局側第２ＴＣＨ」という。）の割当のためにＴＣＨ追加要求信号を送信する（１０８）。
無線基地局３０は、無線中継装置２０からＴＣＨ追加要求信号を受信すると、無線基地局３０で使用していない通信チャネルを無線中継装置２０に対して基地局側第２ＴＣＨとして割り当て、ＴＣＨ追加割当信号によって無線中継装置２０に通知する（１０９）。
【０００８】
無線中継装置２０は、無線基地局３０から割り当てられた基地局側第２ＴＣＨが使用可能であれば、基地局側第２ＴＣＨにおいて、無線基地局３０との通信チャネルを確立する（１１０）。
そして、基地局側第２ＴＣＨ以外の通信チャネルを端末側第２ＴＣＨとして無線端末１０に割り当て、無線端末１０にＴＣＨ追加割当信号によって通知する（１１１）。
【０００９】
無線端末１０は、無線中継装置２０からＴＣＨ追加割当信号を受信すると、端末側第２ＴＣＨにおいて、無線中継装置２０との通信チャネルを確立する（１１２）。
上記に示す手順により、各無線端末１０は、無線中継装置２０を介して無線基地局３０と通信チャネルを確立する（１１３）。
【００１０】
従来の無線チャネル割当方法においては、無線基地局３０及び無線中継装置２０が任意の空き通信チャネルを割り当てる。無線基地局３０は、無線中継装置２０が無線端末１０に割り当てた端末側第１ＴＣＨの割当チャネルを知ることができないので、無線中継装置２０が無線端末１０に割り当てた端末側第１ＴＣＨと無線基地局３０が割り当てた基地局側第２ＴＣＨとが同一となる場合がある。
【００１１】
この場合、無線中継装置２０は、無線基地局３０に再度基地局側第２ＴＣＨの割当を要求するが、無線基地局３０が先に割り当てた基地局側第２ＴＣＨ以外の通信チャネルを割り当てることができなければ、無線端末１０と無線基地局３０の間において複数の通信チャネルを確立することができない。
また、現在のＰＨＳの無線端末１０においては、無線端末１０の送受信機の性能から、端末側第１ＴＣＨと端末側第２ＴＣＨで割り当てることができない通信チャネルの組合せが存在する。例えば、多くのＰＨＳの無線端末１０では、ＴＤＭＡ（Ｔｉｍｅ Ｄｉｖｉｓｉｏｎ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ：時分割多元接続）における第１スロットと第４スロットとを同時に使用して通信することはできない。
【００１２】
無線中継装置２０が、端末側第１ＴＣＨと端末側第２ＴＣＨで割り当てることができない通信チャネルを割り当てると、無線端末１０と無線基地局３０の間において通信チャネルを確立することができない。これにより、無線端末１０の呼損率を大きくなるという問題がある。
【００１３】
【発明が解決しようとする課題】
従来の無線チャネル割当方法では、通信チャネルの割当方法によっては、無線端末１０と無線基地局３０との間で通信チャネルの確立が不可能になる通信チャネルの組合せが発生し、無線端末１０の呼損率増大の原因となっている。
本発明は、このような課題を解決するもので、無線端末と無線基地局との間で通信チャネルの確立が不可能になる通信チャネルの組合せを回避し、呼損率を減少させることができる無線通信システム、無線チャネル割当方法及び無線中継装置を提供することを目的とする。
【００１４】
【課題を解決するための手段】
請求項１に記載された発明は、無線基地局３０と無線端末１０と無線中継装置２０とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う際の無線チャネル割当方法において、前記無線中継装置は、前記無線基地局から割り当てられる通信チャネルと制御チャネルに基づいて無線端末に割り当てる通信チャネルを決定するステップと、前記無線基地局から割り当てられる通信チャネルが前記無線端末と前記無線中継装置との間で使用している通信チャネルと同じである場合、又は、前記無線端末に割り当てようとする通信チャネルの組合せが、前記無線端末が通信チャネルを確立することができない組合せになる場合に、前記無線基地局に対して通信チャネルの再割当を要求するステップとを含むことを特徴とする。
【００１５】
請求項２に記載された発明は、無線基地局３０と無線端末１０と無線中継装置２０とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う際の無線チャネル割当方法において、前記無線端末と前記無線基地局間で複数の通信チャネルの接続を行う際に、前記無線中継器装置は、
（１）前記無線端末から呼接続の要求を受けた場合、前記無線基地局に対し１つの通信チャネルを要求し、前記無線基地局から１つの無線チャネルを割り当てられる第一のステップと、
（２）前記無線基地局から割り当てられた通信チャネルと制御チャネルから前記無線端末に割り当てる１つの通信チャネルを決定し、該通信チャネルを前記無線端末に割り当てる第二のステップと、
（３）前記無線端末に対して全ての通信チャネルを割り当てるまで前記第一のステップと前記第二のステップを繰り返す第三のステップと、
（４）前記第三のステップを処理する過程において、前記無線基地局から割り当てられる１つの通信チャネルが先に前記無線端末へ割り当てた通信チャネルに等しい、又は、前記無線端末に割り当てようとする通信チャネルの組み合わせでは前記無線端末と通信不可能であると判断し、その場合、前記無線基地局に対し通信チャネルの割り当てを再要求する第四のステップ
とを備え、前記無線中継装置は、前記無線端末に対し通信可能な全ての通信チャネルを割り当てることで通信チャネルの割当処理を終了することを特徴とする。
【００１６】
請求項３に記載された発明は、請求項２に記載の無線チャネル割当方法において、前記無線中継装置が１つ目の通信チャネルを前記無線基地局から割り当てられた際に、割り当てられた通信チャネルが先に定めた通信チャネルに等しければ、前記無線基地局に対して通信チャネルの再要求を行うステップを含むことを特徴とする。
【００１７】
請求項４に記載された発明は、無線基地局と無線端末と無線中継装置とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う無線通信システムにおいて、前記無線中継装置は、前記無線基地局から割り当てられる通信チャネルと制御チャネルに基づいて前記無線端末に割り当てる通信チャネルを決定する手段と、前記無線基地局から割り当てられる通信チャネルが前記無線端末と前記無線中継装置との間で使用している通信チャネルと同じである場合、又は、前記無線端末に割り当てる通信チャネルの組合せが、前記無線端末が通信チャネルを確立することができない組合せになる場合に、前記無線基地局に対して通信チャネルの再割当を要求する手段とを含むことを特徴とする。
【００１８】
請求項５に記載された発明は、無線基地局と無線端末と無線中継装置とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う無線通信システムにおける無線中継装置において、前記無線中継器装置は、
（１）前記無線端末から呼接続の要求を受けた場合、前記無線基地局に対し１つの通信チャネルを要求し、前記無線基地局から１つの無線チャネルを割り当てられる第一の処理を実行する手段と、
（２）前記無線基地局から割り当てられた通信チャネルと制御チャネルから前記無線端末に割り当てる１つの通信チャネルを決定し、該通信チャネルを前記無線端末に割り当てる第二の処理を実行する手段と、
（３）前記無線端末に対して全ての通信チャネルを割り当てるまで前記第一の処理と前記第二の処理を繰り返す第三の処理を実行する手段と、
（４）前記第三の処理を実行する過程において、前記無線基地局から割り当てられる１つの通信チャネルが先に前記無線端末へ割り当てた通信チャネルに等しい、又は、前記無線端末に割り当てようとする通信チャネルの組み合わせでは前記無線端末と通信不可能であると判断し、その場合、前記無線基地局に対し通信チャネルの割り当てを再要求する手段
とを備え、前記無線中継装置は、前記無線端末に対し通信可能な全ての通信チャネルを割り当てることで通信チャネルの割当処理を終了することを特徴とする。
【００１９】
【発明の実施の形態】
本発明の実施の形態を図１を参照して説明する。
本発明が適用される無線通信システムの構成例は、従来例で示したものと同じである。無線端末１０と、無線端末１０と無線チャネルで接続される無線中継装置２０と、無線中継装置２０と無線チャネルで接続される無線基地局３０とで構成される。
【００２０】
ここにおいて、無線中継装置２０は、無線基地局３０から割り当てられる通信チャネルと制御チャネルとの割当チャネルから無線端末１０に割り当てる通信チャネルを決定する手段を備え、無線基地局３０から割り当てられる通信チャネルが無線端末１０と無線中継装置２０との間で使用している通信チャネルと同じである場合、又は、無線端末１０に割り当てる通信チャネルの組合せが、無線端末１０が通信チャネルを確立することができない組合せになる場合に、無線基地局３０に対して通信チャネルの再割当を要求する手段を含むことを特徴とする。
【００２１】
次に本実施の形態の動作を図面を参照して説明する。
このような構成の無線通信システムでの発信のシーケンスを図２に示す。図２のシーケンスは、ＰＨＳを例にとって示している。図２には、通信チャネルの内容も示し、シーケンスに従って通信チャネルが割り当てられる。
ＰＨＳでは、無線チャネル構成はＴＤＭＡであり、１つの無線端末１０及び無線中継装置２０が使用可能である。無線チャネルは４つあり、この無線チャネルを第１スロット、第２スロット、第３スロット、第４スロットと呼ぶ。
【００２２】
無線基地局３０と無線中継装置２０とで無線通信を行うためには、無線基地局３０と無線中継装置２０とが同じ通信チャネルを使用する必要がある。同様に、無線中継装置２０と無線端末１０とで無線通信を行うためには、無線中継装置２０と無線端末１０とが同じ通信チャネルを使用する必要がある。
無線中継装置２０では、無線基地局３０との通信チャネルと無線端末１０との通信チャネルは別の通信チャネルにする必要がある。例えば、無線基地局３０と無線中継装置２０とで使用する通信チャネルが、第２スロット、第３スロットであるならば、無線中継装置２０と無線端末１０とで使用する通信チャネルは、第１スロット、第４スロットとする必要がある。
【００２３】
また、数字符号１は、無線端末１０から無線中継装置２０、又は無線中継装置２０から無線基地局３０に送信されるＬＣＨ確立要求信号を、符号２は無線基地局３０から無線中継装置２０、又は無線中継装置２０から無線端末１０に送信されるＬＣＨ割当信号を、符号３は無線端末１０から無線中継装置２０、又は無線中継装置２０から無線基地局３０に送信されるＴＣＨ追加要求信号を、符号４は無線基地局３０から無線中継装置２０、又は無線中継装置２０から無線端末１０に送信されるＴＣＨ追加割当信号を、符号５は無線端末１０から無線中継装置２０、又は無線中継装置２０から無線基地局３０に送信されるＬＣＨ確立再要求信号、符号６は、無線端末１０から無線中継装置２０、又は無線中継装置２０から無線基地局３０に送信されるＴＣＨ追加再要求信号を示している。
【００２４】
無線基地局３０は、無線中継装置２０に対して制御チャネルで制御信号（以下、「基地局側ＬＣＣＨ」という。）を送信している。また、無線中継装置２０も無線端末１０に対してＬＣＣＨを送信している。ここで、無線基地局３０と無線中継装置２０との間の制御チャネル（以下、「基地局側制御チャネル」という。）の割当チャネルを第１スロット、無線中継装置２０と無線端末１０との間の制御チャネル（以下、「端末側制御チャネル」という。）の割当チャネルを第４スロットとする。
【００２５】
無線端末１０は、発信時に無線端末１０側の第１の通信チャネル（以下、「端末側第１ＴＣＨ」という。）の割当のためのＬＣＨ確立要求信号１を制御チャネルによって無線中継装置２０に送信する。
無線中継装置２０は、無線端末１０からの端末側第１ＴＣＨの割当のためのＬＣＨ確立要求信号１を受信すると、無線基地局３０に対して無線基地局側の第１の通信チャネル（以下、「基地局側第１ＴＣＨ」という。）の割当のためにＬＣＨ確立要求信号１を制御チャネルによって送信する。
【００２６】
無線基地局３０は、無線中継装置２０からＬＣＨ確立要求信号１を受信すると、無線基地局３０で使用していない通信チャネルを無線中継装置２０に対して基地局側第１ＴＣＨとして割り当て、ＬＣＨ割当信号２によって無線中継装置２０に通知する。ＬＣＨ割当信号２には無線基地局３０と無線中継装置２０との間の割当チャネルの情報が含まれている。
【００２７】
基地局側第１ＴＣＨの割当チャネルの決定方法としては、無線基地局３０で使用していない無線チャネルを割り当てるものとする。ここで、無線基地局３０は基地局側第１ＴＣＨを第４スロットに割り当てたものとする。
無線中継装置２０は、無線基地局３０から送信されたＬＣＨ割当信号２を受信する。基地局側第１ＴＣＨが、無線端末１０に組み合わせて割り当てられない第１スロット又は第４スロットを割り当てられたならば、これらのスロットはできれば最後に割り当てたいので、無線中継装置２０は、無線基地局３０に対してＬＣＨ確立再要求信号５を送信する。無線基地局３０は、無線中継装置２０からＬＣＨ確立再要求信号５を受信すると、先に送信した基地局側第１ＴＣＨで割り当てた通信チャネル以外に割り当てられる通信チャネルがあれば、その通信チャネルを基地局側第１ＴＣＨに割り当て、無線中継装置２０にＬＣＨ割当信号２を送信する。
【００２８】
ここで、無線基地局３０は、基地局側第１ＴＣＨを第３スロットに割り当てたとする。無線中継装置２０は、無線基地局３０から送信されたＬＣＨ割当信号２を受信する。
ＬＣＨ割当信号２を受信したときの通信チャネルの割当制御は、図３に示すフローチャートに沿って行われる。
【００２９】
割り当てられた通信チャネルが第１スロット又は第４スロットにあり（Ｓ１０２）、かつ、制御チャネルが第１スロット又は第４スロットにあり（Ｓ１０３）、かつ、制御チャネルと割り当てられた通信チャネルが異なるスロットである場合（Ｓ１０４）、ＬＣＨ確立再要求信号５を送信して（Ｓ１０５）、ＬＣＨ割当信号２を受信することを繰り返す。
【００３０】
その他の場合、無線中継装置２０は、無線基地局３０から割り当てられた基地局側第１ＴＣＨのスロットを調べ、他に干渉波が存在せず、通信可能であれば、無線中継装置２０と無線基地局３０との基地局側第１ＴＣＨの同期を確立する（Ｓ１０６）。無線中継装置２０は、基地局側第１ＴＣＨの同期が確立すると、無線端末１０と無線中継装置２０との間の端末側第１ＴＣＨの割当チャネルを決定する。割当チャネルは、基地局側第１ＴＣＨの割当チャネルと基地局側制御チャネルの割当チャネルから決定する。
【００３１】
例として、テーブルによって端末側第１ＴＣＨの割当チャネルを決定するとしたときのテーブルの例を図４に示す。例えば、基地局側第１ＴＣＨが第３スロットに割り当てられ、基地局側制御チャネルが第１スロットに割り当てられているのならば、端末側第１ＴＣＨは図４を参照することにより、第２スロットに割り当てられる。無線中継装置２０は、端末側第１ＴＣＨの割当チャネル（ここでは第２スロットとする）を無線端末１０にＬＣＨ割当信号２で送信する。無線端末１０は、ＬＣＨ割当信号２を受信すると、端末側第１ＴＣＨで割り当てられた割当チャネルが使用可能かどうか調べ、使用可能であれば、端末側第１ＴＣＨで無線中継装置２０と同期の確立を行う。
【００３２】
そして、無線端末１０は、端末側第２ＴＣＨの割当を要求するために無線中継装置２０に対して、ＴＣＨ追加要求信号３を送信する。無線中継装置２０は、無線端末１０から送信されたＴＣＨ追加要求信号３を受信すると、無線基地局３０に対してＴＣＨ追加要求信号３を送信する。無線基地局３０は、無線中継装置２０から送信されたＴＣＨ追加割当信号３を受信すると、使用可能である割当チャネルをＴＣＨ追加割当信号４によって無線中継装置２０に送信する。ここで、基地局側第２ＴＣＨの割当チャネルを第２スロットとする。無線中継装置２０はＴＣＨ追加割当信号４を受信し、無線基地局３０からＴＣＨ追加割当信号４によって割り当てられた基地局側第２ＴＣＨの割当チャネルが端末側第１ＴＣＨの割当チャネルに等しければ、無線基地局３０にＴＣＨ追加再要求信号６を無線基地局３０に送信する。
【００３３】
また、ＰＨＳの無線端末１０の多くは、特定の通信チャネルの組み合わせでは無線通信が不可能である。具体的には、端末側第１ＴＣＨと端末側第２ＴＣＨに割り当てられた割当チャネルの組み合わせが第１スロットと第４スロットとなる場合、無線端末１０は、無線通信が不可能になる。そこで、無線中継装置２０は端末側第１ＴＣＨと端末側第２ＴＣＨとの割当スロットの組み合わせが、第１スロット、第４スロットとなる場合、無線基地局３０にＴＣＨ追加再要求信号６を送信する。
【００３４】
無線基地局３０は、ＴＣＨ追加再要求信号６を受信すると、先に基地局側第２ＴＣＨとして割り当てた割当チャネル以外の通信チャネルを割り当て、ＴＣＨ追加割当信号４によって無線中継装置２０に送信する。先に基地局側第２ＴＣＨとして割り当てた割当チャネル以外の通信チャネルを割り当てられなければ、先に基地局側第２ＴＣＨとして割り当てた割当チャネルをＴＣＨ追加割当信号４によって無線中継装置２０に送信する。ここで、無線基地局３０は、基地局側第２ＴＣＨとして第４スロットを割り当てたとする。
【００３５】
無線中継装置２０は、ＴＣＨ追加割当信号４を受信すると、割当チャネルが使用可能かどうか調べ、使用可能であれば、基地局側第２ＴＣＨの同期を確立する。ここで第４スロットは端末側の制御チャネルであるが、端末側ＬＣＣＨを停止して基地局側第２ＴＣＨの同期を確立する。
そして、端末側第２ＴＣＨの通信チャネルを割り当てる端末側第２ＴＣＨに割り当てる割当チャネルは、基地局側第１ＴＣＨ、基地局側第２ＴＣＨ、端末側第１ＴＣＨで割り当てられた割当チャネル以外とする基地局側第１ＴＣＨの割当チャネルが第３スロット、端末側第１ＴＣＨの割当チャネルが第２スロット、基地局側第２ＴＣＨの割当チャネルが第４スロットとすると、端末側第２ＴＣＨの割当チャネルは第１スロットとなる。無線中継装置２０は、端末側第２ＴＣＨの割当チャネルをＴＣＨ追加割当信号４で無線端末１０に送信する。
【００３６】
無線端末１０は、ＴＣＨ追加割当信号４を受信すると、割当チャネルが使用可能かどうか調べ、使用可能であれば、端末側側第２ＴＣＨの同期を確立する。
図５は、本発明を用いた場合の呼接続確率のシミュレーションの結果を、従来例の場合と比較して示す図である。シミュレーションの諸元は、無線基地局３０では、制御チャネル１つと通信チャネル３つ使用可能であり、空き通信チャネルは２つ、又は３つである。
【００３７】
本発明によれば、図５に示されるように、空き通信チャネルが２つの場合で、呼接続確率を約３０％改善できる。
【００３８】
【発明の効果】
以上の通り、本発明は、無線基地局と無線中継装置との間で割り当てられた１つ目の通信チャネルを選択し、この割り当てられた１つ目の通信チャネル及び無線基地局から送信される制御チャネルから無線端末に割り当てる通信チャネルを決定することにより、無線基地局から割り当てられた２つ目の通信チャネルが無線端末に割り当てた１つ目の通信チャネルに等しくなることを防ぎ、呼損率を低減させることができる。また、特定の通信チャネルの組合せでは通信不可能となる無線端末に対して、その特定の組合せの通信チャネルを割り当てることを防ぐことが可能となり、呼損率を低減させることができる。
【００３９】
また、本発明によれば、無線端末が無線基地局との通信チャネルを確立するための通信チャネルの割当を効率的に行うことによって、呼損率を減少させることができる。
【図面の簡単な説明】
【図１】無線通信システムの構成例を示す図である。
【図２】実施の形態を説明するためシーケンス図である。
【図３】通信チャネルの割当制御を示すフローチャートである。
【図４】端末側第１ＴＣＨの割当チャネルを決定するテーブルの例である。
【図５】呼接続確率のシミュレーションの結果を示す図である。
【図６】無線通信システムでの無線チャネル割当方法のシーケンス図である。
【符号の説明】
１０ 無線端末
２０ 無線中継装置
３０ 無線基地局[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio communication system, a radio channel assignment method, and a radio relay device, and more particularly, includes a radio base station, a radio terminal, and a radio relay device, and the radio relay device is arranged between the radio terminal and the radio base station. The present invention relates to a wireless communication system, a wireless channel assignment method, and a wireless relay apparatus that perform communication by way of communication.
[0002]
[Prior art]
FIG. 1 shows a configuration example of a conventional wireless communication system. The wireless terminal 10 includes a wireless relay device 20 connected to the wireless terminal 10 via a wireless channel, and a wireless base station 30 connected to the wireless relay device 20 via a wireless channel. The radio base station 30 is connected to other radio base stations or PSTN (Public Switched Telephone Network), ISDN (Integrated Services Digital Network), an exchange station such as the Internet, a router, and the like. Yes.
[0003]
A sequence of a radio channel assignment method in this conventional radio communication system will be described with reference to FIG. FIG. 6 shows a case where 64k wireless communication is performed using a PHS (Personal Handy-phone System).
The wireless terminal 10 transmits an LCH (link channel) establishment request signal for allocation of a first communication channel on the wireless terminal side (hereinafter referred to as “terminal-side first TCH”) to the wireless relay device 20 at the time of transmission ( 101).
[0004]
When receiving the LCH establishment request signal for allocation of the terminal-side first TCH from the radio terminal 10, the radio relay apparatus 20 transmits to the radio base station 30 a first communication channel on the radio base station side (hereinafter referred to as “base”). An LCH establishment request signal is transmitted for the allocation of the “station side first TCH” (102).
When receiving the LCH establishment request signal from the radio relay device 20, the radio base station 30 assigns a communication channel not used by the radio base station 30 to the radio relay device 20 as the first TCH on the base station side, and assigns the assigned channel ( (Hereinafter referred to as “allocation channel”) is notified to the radio relay apparatus 20 by the LCH allocation signal (103).
[0005]
If the base station side first TCH allocated from the radio base station 30 is usable, the radio relay apparatus 20 establishes a communication channel with the radio base station 30 in the base station side first TCH (104).
Then, communication channels other than the base station side first TCH are allocated to the radio terminal 10 as the terminal side first TCH, and notified to the radio terminal 10 by an LCH allocation signal (105).
[0006]
When receiving the LCH allocation signal from the radio relay apparatus 20, the radio terminal 10 establishes a communication channel with the radio relay apparatus 20 in the terminal-side first TCH (106).
Then, a TCH addition request signal is transmitted to the radio relay apparatus 20 in order to request the radio relay apparatus 20 to allocate a second communication channel on the radio terminal 10 side (hereinafter referred to as “terminal side second TCH”) (107 ).
[0007]
When receiving the TCH addition request signal from the radio terminal 10, the radio relay apparatus 20 transmits a second communication channel on the radio base station side to the radio base station 30 (hereinafter referred to as “base station side second TCH”). A TCH addition request signal is transmitted for assignment (108).
When receiving the TCH addition request signal from the radio relay apparatus 20, the radio base station 30 allocates a communication channel not used by the radio base station 30 to the radio relay apparatus 20 as the second TCH on the base station side, and adds a TCH addition assignment signal. To notify the wireless relay device 20 (109).
[0008]
If the base station side second TCH allocated from the radio base station 30 is usable, the radio relay apparatus 20 establishes a communication channel with the radio base station 30 in the base station side second TCH (110).
Then, communication channels other than the base station side second TCH are allocated to the radio terminal 10 as the terminal side second TCH, and notified to the radio terminal 10 by a TCH additional allocation signal (111).
[0009]
When receiving the TCH additional allocation signal from the radio relay apparatus 20, the radio terminal 10 establishes a communication channel with the radio relay apparatus 20 in the terminal-side second TCH (112).
Through the procedure described above, each wireless terminal 10 establishes a communication channel with the wireless base station 30 via the wireless relay device 20 (113).
[0010]
In the conventional radio channel allocation method, the radio base station 30 and the radio relay apparatus 20 allocate an arbitrary free communication channel. Since the radio base station 30 cannot know the allocation channel of the terminal-side first TCH assigned to the radio terminal 10 by the radio relay device 20, the radio base station 30 and the terminal-side first TCH assigned to the radio terminal 10 by the radio relay device 20 The base station side second TCH assigned by 30 may be the same.
[0011]
In this case, the radio relay apparatus 20 requests the radio base station 30 to allocate the second base station side second TCH again, but can allocate a communication channel other than the base station side second TCH allocated by the radio base station 30 first. Otherwise, a plurality of communication channels cannot be established between the wireless terminal 10 and the wireless base station 30.
In addition, in the current PHS radio terminal 10, there are combinations of communication channels that cannot be assigned by the terminal-side first TCH and the terminal-side second TCH due to the performance of the transceiver of the radio terminal 10. For example, many PHS wireless terminals 10 cannot communicate using the first slot and the fourth slot in TDMA (Time Division Multiple Access) at the same time.
[0012]
If the radio relay apparatus 20 assigns a communication channel that cannot be assigned by the terminal-side first TCH and the terminal-side second TCH, a communication channel cannot be established between the radio terminal 10 and the radio base station 30. As a result, there is a problem that the call loss rate of the wireless terminal 10 is increased.
[0013]
[Problems to be solved by the invention]
In the conventional radio channel allocation method, depending on the communication channel allocation method, a combination of communication channels that makes it impossible to establish a communication channel between the radio terminal 10 and the radio base station 30 occurs. This is the cause of the increase.
The present invention solves such a problem, and avoids a combination of communication channels that makes it impossible to establish a communication channel between a radio terminal and a radio base station, and can reduce a call loss rate. An object is to provide a system, a radio channel assignment method, and a radio relay apparatus.
[0014]
[Means for Solving the Problems]
The invention described in claim 1 includes a radio base station 30, a radio terminal 10, and a radio relay device 20, and a radio when the radio terminal and the radio base station communicate via the radio relay device. In the channel allocation method, the radio relay apparatus determines a communication channel to be allocated to a radio terminal based on a communication channel and a control channel allocated from the radio base station, and the communication channel allocated from the radio base station is the radio channel. If the same communication channel is used between the terminal and the wireless relay device, or the combination of communication channels to be assigned to the wireless terminal cannot be established by the wireless terminal Requesting the radio base station to reallocate a communication channel in the case of combination. .
[0015]
The invention described in claim 2 includes a radio base station 30, a radio terminal 10, and a radio relay device 20, and the radio when the radio terminal and the radio base station communicate via the radio relay device. In the channel allocation method, when connecting a plurality of communication channels between the wireless terminal and the wireless base station, the wireless repeater device is:
(1) When receiving a call connection request from the wireless terminal, a first step of requesting one communication channel from the wireless base station and assigning one wireless channel from the wireless base station;
(2) a second step of determining one communication channel to be allocated to the radio terminal from the communication channel and control channel allocated from the radio base station, and allocating the communication channel to the radio terminal;
(3) a third step that repeats the first step and the second step until all communication channels are assigned to the wireless terminal;
(4) In the process of processing the third step, one communication channel allocated from the radio base station is equal to a communication channel allocated to the radio terminal first, or communication to be allocated to the radio terminal Determining that communication with the wireless terminal is impossible with a combination of channels, and in this case, a fourth step of re-requesting the wireless base station to allocate a communication channel, and the wireless relay device includes the wireless terminal The communication channel assignment process is terminated by assigning all communication channels that can be communicated to the terminal.
[0016]
According to a third aspect of the present invention, in the radio channel allocation method according to the second aspect, when the radio relay apparatus allocates a first communication channel from the radio base station, the allocated communication channel Is equal to the previously determined communication channel, the method includes a step of re-requesting the communication channel to the radio base station.
[0017]
The invention described in claim 4 includes a radio base station, a radio terminal, and a radio relay device, wherein the radio terminal and the radio base station communicate with each other via the radio relay device. The radio relay apparatus determines a communication channel to be allocated to the radio terminal based on a communication channel and a control channel allocated from the radio base station, and the communication channel allocated from the radio base station is the radio terminal and the radio relay. When the same communication channel is used with a device, or when the combination of communication channels assigned to the wireless terminal is a combination in which the wireless terminal cannot establish a communication channel, the wireless And means for requesting the base station to reallocate the communication channel.
[0018]
According to a fifth aspect of the present invention, there is provided a radio relay in a radio communication system comprising a radio base station, a radio terminal, and a radio relay device, wherein the radio terminal and the radio base station communicate via the radio relay device. In the device, the wireless repeater device is:
(1) Means for requesting one communication channel from the radio base station when receiving a call connection request from the radio terminal, and executing a first process in which one radio channel is allocated from the radio base station When,
(2) means for determining a communication channel to be allocated to the radio terminal from the communication channel and control channel allocated from the radio base station, and executing a second process of allocating the communication channel to the radio terminal;
(3) means for executing a third process that repeats the first process and the second process until all communication channels are allocated to the wireless terminal;
(4) In the process of executing the third processing, one communication channel allocated from the radio base station is equal to a communication channel allocated to the radio terminal first, or communication to be allocated to the radio terminal It is determined that communication with the wireless terminal is impossible with a combination of channels, and in that case, the wireless base station comprises means for re-requesting communication channel assignment to the wireless base station, and the wireless relay device The communication channel assignment process is terminated by assigning all communicable communication channels.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG.
A configuration example of a wireless communication system to which the present invention is applied is the same as that shown in the conventional example. The wireless terminal 10 includes a wireless relay device 20 connected to the wireless terminal 10 via a wireless channel, and a wireless base station 30 connected to the wireless relay device 20 via a wireless channel.
[0020]
Here, the radio relay apparatus 20 includes means for determining a communication channel to be allocated to the radio terminal 10 from an allocation channel of a communication channel and a control channel allocated from the radio base station 30, and the communication channel allocated from the radio base station 30 is When the communication channel used between the wireless terminal 10 and the wireless relay device 20 is the same, or the combination of communication channels assigned to the wireless terminal 10 cannot be established by the wireless terminal 10 In this case, the radio base station 30 includes means for requesting reassignment of the communication channel.
[0021]
Next, the operation of the present embodiment will be described with reference to the drawings.
FIG. 2 shows a transmission sequence in the wireless communication system having such a configuration. The sequence in FIG. 2 is shown by taking PHS as an example. FIG. 2 also shows the contents of the communication channel, and the communication channel is assigned according to the sequence.
In PHS, the radio channel configuration is TDMA, and one radio terminal 10 and radio relay apparatus 20 can be used. There are four radio channels, and these radio channels are called a first slot, a second slot, a third slot, and a fourth slot.
[0022]
In order to perform radio communication between the radio base station 30 and the radio relay apparatus 20, it is necessary for the radio base station 30 and the radio relay apparatus 20 to use the same communication channel. Similarly, in order to perform wireless communication between the wireless relay device 20 and the wireless terminal 10, it is necessary for the wireless relay device 20 and the wireless terminal 10 to use the same communication channel.
In the radio relay device 20, the communication channel with the radio base station 30 and the communication channel with the radio terminal 10 need to be different communication channels. For example, if the communication channel used by the radio base station 30 and the radio relay device 20 is the second slot and the third slot, the communication channel used by the radio relay device 20 and the radio terminal 10 is the first slot. The fourth slot is required.
[0023]
Further, numeral 1 is an LCH establishment request signal transmitted from the radio terminal 10 to the radio relay apparatus 20 or from the radio relay apparatus 20 to the radio base station 30, and numeral 2 is a radio relay apparatus 20 from the radio base station 30. Reference numeral 3 denotes an LCH allocation signal transmitted from the radio relay apparatus 20 to the radio terminal 10, and reference numeral 3 denotes an TCH addition request signal transmitted from the radio terminal 10 to the radio relay apparatus 20 or from the radio relay apparatus 20 to the radio base station 30. Reference numeral 4 denotes a TCH additional allocation signal transmitted from the radio base station 30 to the radio relay apparatus 20 or from the radio relay apparatus 20 to the radio terminal 10, and reference numeral 5 denotes a radio signal from the radio terminal 10 to the radio relay apparatus 20 or the radio relay apparatus 20. LCH establishment re-request signal transmitted to the base station 30, symbol 6 is transmitted from the wireless terminal 10 to the wireless relay device 20 or from the wireless relay device 20 to the wireless base station 30. Shows a TCH additional re-request signal.
[0024]
The radio base station 30 transmits a control signal (hereinafter referred to as “base station side LCCH”) to the radio relay apparatus 20 using a control channel. Further, the radio relay device 20 also transmits the LCCH to the radio terminal 10. Here, a control channel between the radio base station 30 and the radio relay apparatus 20 (hereinafter referred to as “base station side control channel”) is assigned to the first slot, and the radio relay apparatus 20 and the radio terminal 10 are allocated. The assigned channel of the control channel (hereinafter referred to as “terminal-side control channel”) is the fourth slot.
[0025]
The wireless terminal 10 transmits an LCH establishment request signal 1 for allocation of a first communication channel on the wireless terminal 10 side (hereinafter referred to as “terminal-side first TCH”) to the wireless relay device 20 through a control channel at the time of transmission. .
When the radio relay apparatus 20 receives the LCH establishment request signal 1 for allocation of the terminal-side first TCH from the radio terminal 10, the radio relay apparatus 20 transmits to the radio base station 30 a first communication channel on the radio base station side (hereinafter, “ LCH establishment request signal 1 is transmitted through the control channel for allocation of the first base station side TCH.
[0026]
When the radio base station 30 receives the LCH establishment request signal 1 from the radio relay apparatus 20, the radio base station 30 allocates a communication channel that is not used by the radio base station 30 to the radio relay apparatus 20 as the first TCH on the base station side. 2 to notify the wireless relay device 20. The LCH allocation signal 2 includes information on the allocation channel between the radio base station 30 and the radio relay apparatus 20.
[0027]
As a method for determining the allocation channel of the first TCH on the base station side, radio channels that are not used by the radio base station 30 are allocated. Here, it is assumed that the radio base station 30 has assigned the base station side first TCH to the fourth slot.
The radio relay device 20 receives the LCH assignment signal 2 transmitted from the radio base station 30. If the first TCH on the base station side is assigned the first slot or the fourth slot that is not assigned in combination with the radio terminal 10, these slots should be assigned last if possible. LCH establishment re-request signal 5 is transmitted to 30. When the radio base station 30 receives the LCH establishment re-request signal 5 from the radio relay apparatus 20, if there is a communication channel assigned other than the communication channel assigned in the first base station side TCH transmitted earlier, the radio base station 30 sets the communication channel to the base station. The LCH allocation signal 2 is transmitted to the radio relay apparatus 20 by being allocated to the station side first TCH.
[0028]
Here, it is assumed that the radio base station 30 assigns the base station side first TCH to the third slot. The radio relay device 20 receives the LCH assignment signal 2 transmitted from the radio base station 30.
Communication channel assignment control when the LCH assignment signal 2 is received is performed according to the flowchart shown in FIG.
[0029]
The assigned communication channel is in the first slot or the fourth slot (S102), the control channel is in the first slot or the fourth slot (S103), and the assigned communication channel is different from the control channel. (S104), the LCH establishment re-request signal 5 is transmitted (S105), and the reception of the LCH allocation signal 2 is repeated.
[0030]
In other cases, the radio relay apparatus 20 checks the slot of the base station side first TCH allocated from the radio base station 30, and if there is no other interference wave and communication is possible, the radio relay apparatus 20 and the radio base station The base station side first TCH is synchronized with the station 30 (S106). When the synchronization of the base station side first TCH is established, the radio relay apparatus 20 determines an allocation channel of the terminal side first TCH between the radio terminal 10 and the radio relay apparatus 20. The allocation channel is determined from the allocation channel of the base station side first TCH and the allocation channel of the base station side control channel.
[0031]
As an example, FIG. 4 shows an example of a table when the allocation channel of the terminal-side first TCH is determined by the table. For example, if the base station side first TCH is assigned to the third slot and the base station side control channel is assigned to the first slot, the terminal side first TCH is assigned to the second slot by referring to FIG. Assigned. The radio relay apparatus 20 transmits the terminal-side first TCH allocation channel (here, the second slot) to the radio terminal 10 using the LCH allocation signal 2. Upon receiving the LCH allocation signal 2, the radio terminal 10 checks whether the allocation channel allocated by the terminal-side first TCH can be used, and if it can be used, establishes synchronization with the radio relay apparatus 20 by using the terminal-side first TCH. Do.
[0032]
Then, the radio terminal 10 transmits a TCH addition request signal 3 to the radio relay apparatus 20 in order to request allocation of the terminal-side second TCH. When receiving the TCH addition request signal 3 transmitted from the radio terminal 10, the radio relay device 20 transmits the TCH addition request signal 3 to the radio base station 30. When receiving the TCH additional allocation signal 3 transmitted from the radio relay apparatus 20, the radio base station 30 transmits an available allocation channel to the radio relay apparatus 20 using the TCH additional allocation signal 4. Here, the allocation channel of the base station side second TCH is defined as the second slot. The radio relay apparatus 20 receives the TCH additional allocation signal 4, and if the allocation channel of the base station side second TCH allocated by the TCH additional allocation signal 4 from the radio base station 30 is equal to the allocation channel of the terminal side first TCH, the radio base station 30 A TCH addition re-request signal 6 is transmitted to the radio base station 30 to the station 30.
[0033]
In addition, many of the PHS wireless terminals 10 cannot perform wireless communication with a combination of specific communication channels. Specifically, when the combination of assigned channels assigned to the terminal-side first TCH and the terminal-side second TCH is the first slot and the fourth slot, the radio terminal 10 cannot perform radio communication. Therefore, when the combination of the allocation slots of the terminal-side first TCH and the terminal-side second TCH is the first slot and the fourth slot, the radio relay apparatus 20 transmits the TCH addition re-request signal 6 to the radio base station 30.
[0034]
When receiving the TCH addition re-request signal 6, the radio base station 30 assigns a communication channel other than the assignment channel previously assigned as the base station side second TCH, and transmits the communication channel to the radio relay apparatus 20 using the TCH addition assignment signal 4. If a communication channel other than the allocation channel previously allocated as the base station side second TCH cannot be allocated, the allocation channel previously allocated as the base station side second TCH is transmitted to the radio relay apparatus 20 by the TCH additional allocation signal 4. Here, it is assumed that the radio base station 30 allocates the fourth slot as the base station side second TCH.
[0035]
When receiving the TCH additional allocation signal 4, the radio relay apparatus 20 checks whether the allocation channel is usable, and if it is usable, establishes synchronization of the base station side second TCH. Here, the fourth slot is a control channel on the terminal side, but the terminal side LCCH is stopped to establish synchronization with the base station side second TCH.
Then, the allocation channel to be allocated to the terminal-side second TCH to which the communication channel of the terminal-side second TCH is allocated is other than the allocation channel allocated to the base station-side first TCH, the base station-side second TCH, and the terminal-side first TCH. If the allocation channel of 1TCH is the third slot, the allocation channel of the first TCH on the terminal side is the second slot, and the allocation channel of the second TCH on the base station side is the fourth slot, the allocation channel of the terminal side second TCH is the first slot. The radio relay apparatus 20 transmits the allocation channel of the terminal-side second TCH to the radio terminal 10 using the TCH additional allocation signal 4.
[0036]
When the radio terminal 10 receives the TCH additional allocation signal 4, the radio terminal 10 checks whether or not the allocation channel can be used, and if so, establishes synchronization of the terminal-side second TCH.
FIG. 5 is a diagram showing the simulation result of the call connection probability when the present invention is used in comparison with the conventional example. As for the specifications of the simulation, in the radio base station 30, one control channel and three communication channels can be used, and there are two or three free communication channels.
[0037]
According to the present invention, as shown in FIG. 5, the call connection probability can be improved by about 30% when there are two free communication channels.
[0038]
【The invention's effect】
As described above, the present invention selects the first communication channel assigned between the radio base station and the radio relay device, and transmits from the assigned first communication channel and the radio base station. By determining the communication channel assigned to the wireless terminal from the control channel, the second communication channel assigned by the wireless base station is prevented from being equal to the first communication channel assigned to the wireless terminal, and the call loss rate is reduced. Can be made. In addition, it is possible to prevent a wireless terminal that cannot communicate with a specific combination of communication channels from being assigned with a specific combination of communication channels, thereby reducing the call loss rate.
[0039]
Further, according to the present invention, the call loss rate can be reduced by efficiently allocating communication channels for the wireless terminal to establish a communication channel with the wireless base station.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system.
FIG. 2 is a sequence diagram for explaining the embodiment;
FIG. 3 is a flowchart showing communication channel assignment control;
FIG. 4 is an example of a table for determining an allocation channel of a terminal-side first TCH.
FIG. 5 is a diagram illustrating a simulation result of call connection probability.
FIG. 6 is a sequence diagram of a radio channel assignment method in a radio communication system.
[Explanation of symbols]
10 wireless terminal 20 wireless relay device 30 wireless base station

Claims (5)

無線基地局と無線端末と無線中継装置とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う際の無線チャネル割当方法において、
前記無線中継装置は、前記無線基地局から割り当てられた前記無線基地局と前記無線中継装置間の通信チャネルと制御チャネルに基づいて無線端末に割り当てる通信チャネルを決定するステップと、
前記無線基地局から割り当てられる通信チャネルが前記無線端末と前記無線中継装置との間で使用している通信チャネルと同じである場合、又は、前記無線端末に割り当てようとする通信チャネルの組合せが、前記無線端末が通信チャネルを確立することができない組合せになる場合に、前記無線基地局に対して通信チャネルの再割当を要求するステップとを含むことを特徴とする無線チャネル割当方法。In a radio channel allocation method when a radio base station, a radio terminal, and a radio relay device are provided, and the radio terminal and the radio base station communicate via the radio relay device,
The radio relay apparatus determines a communication channel to be allocated to a radio terminal based on a communication channel and a control channel between the radio base station and the radio relay apparatus allocated from the radio base station ;
When the communication channel allocated from the radio base station is the same as the communication channel used between the radio terminal and the radio relay device, or a combination of communication channels to be allocated to the radio terminal, Requesting the radio base station to reallocate the communication channel when the wireless terminal has a combination that cannot establish a communication channel. 無線基地局と無線端末と無線中継装置とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う際の無線チャネル割当方法において、
前記無線端末と前記無線基地局間で複数の通信チャネルの接続を行う際に、
前記無線中継器装置は、
（１）前記無線端末から呼接続の要求を受けた場合、前記無線基地局に対し前記無線基地局と前記無線中継装置間の１つの通信チャネルを要求し、前記無線基地局から１つの無線チャネルを割り当てられる第一のステップと、
（２）前記無線基地局から割り当てられた通信チャネルと制御チャネルから前記無線端末に割り当てる１つの通信チャネルを決定し、該通信チャネルを前記無線端末に割り当てる第二のステップと、
（３）前記無線端末に対して全ての通信チャネルを割り当てるまで前記第一のステップと前記第二のステップを繰り返す第三のステップと、
（４）前記第三のステップを処理する過程において、前記無線基地局から割り当てられる１つの通信チャネルが先に前記無線端末へ割り当てた通信チャネルに等しい、又は、前記無線端末に割り当てようとする通信チャネルの組み合わせでは前記無線端末と通信不可能であると判断し、その場合、前記無線基地局に対し通信チャネルの割り当てを再要求する第四のステップとを備え、
前記無線中継装置は、前記無線端末に対し通信可能な全ての通信チャネルを割り当てることで通信チャネルの割当処理を終了することを特徴とする無線チャネル割当方法。In a radio channel allocation method when a radio base station, a radio terminal, and a radio relay device are provided, and the radio terminal and the radio base station communicate via the radio relay device,
When connecting a plurality of communication channels between the wireless terminal and the wireless base station,
The wireless repeater device is
(1) When a call connection request is received from the radio terminal, the radio base station is requested for one communication channel between the radio base station and the radio relay device, and one radio channel is transmitted from the radio base station. The first step to be assigned,
(2) a second step of determining one communication channel to be allocated to the radio terminal from the communication channel and control channel allocated from the radio base station, and allocating the communication channel to the radio terminal;
(3) a third step that repeats the first step and the second step until all communication channels are allocated to the wireless terminal;
(4) In the process of processing the third step, one communication channel allocated from the radio base station is equal to a communication channel allocated to the radio terminal first, or communication to be allocated to the radio terminal It is determined that communication with the wireless terminal is impossible in a combination of channels, and in this case, a fourth step of re-requesting allocation of a communication channel to the wireless base station includes:
The radio relay apparatus ends a communication channel allocation process by allocating all communication channels communicable to the radio terminal. 請求項２に記載の無線チャネル割当方法において、
前記無線中継装置が１つ目の通信チャネルを前記無線基地局から割り当てられた際に、割り当てられた通信チャネルによれば、前記無線端末へ割り当てる通信チャネルが予め定めた通信チャネルに等しくなるような場合は、前記無線基地局に対して通信チャネルの再要求を行うステップを含むことを特徴とする無線チャネル割当方法。The radio channel allocation method according to claim 2,
When the radio relay device is assigned a first communication channel from the radio base station, according to the allocated communication channel, equal to the communication channel the communication channels is determined in advance to allocate to the wireless terminal Kunar In such a case , a radio channel assignment method comprising a step of re-requesting a communication channel to the radio base station. 無線基地局と無線端末と無線中継装置とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う無線通信システムにおいて、
前記無線中継装置は、
前記無線基地局から割り当てられた前記無線基地局と前記無線中継装置間の通信チャネルと制御チャネルに基づいて前記無線端末に割り当てる通信チャネルを決定する手段と、
前記無線基地局から割り当てられた前記無線基地局と前記無線中継装置間の通信チャネルが前記無線端末と前記無線中継装置との間で使用している通信チャネルと同じである場合、又は、前記無線端末に割り当てる通信チャネルの組合せが、前記無線端末が通信チャネルを確立することができない組合せになる場合に、前記無線基地局に対して通信チャネルの再割当を要求する手段とを含む
ことを特徴とする無線通信システム。In a wireless communication system comprising a wireless base station, a wireless terminal, and a wireless relay device, wherein the wireless terminal and the wireless base station communicate via the wireless relay device,
The wireless relay device is
Means for determining a communication channel to be allocated to the radio terminal based on a communication channel and a control channel between the radio base station and the radio relay apparatus allocated from the radio base station;
When the communication channel between the radio base station and the radio relay apparatus allocated from the radio base station is the same as the communication channel used between the radio terminal and the radio relay apparatus, or the radio Means for requesting the radio base station to reallocate the communication channel when the combination of communication channels to be allocated to the terminal is a combination in which the radio terminal cannot establish a communication channel. Wireless communication system. 無線基地局と無線端末と無線中継装置とを備え、前記無線端末と前記無線基地局とが前記無線中継装置を介して通信を行う無線通信システムにおける無線中継装置において、
前記無線中継器装置は、
（１）前記無線端末から呼接続の要求を受けた場合、前記無線基地局に対し前記無線基地局と前記無線中継装置間の１つの通信チャネルを要求し、前記無線基地局から１つの無線チャネルを割り当てられる第一の処理を実行する手段と、
（２）前記無線基地局から割り当てられた通信チャネルと制御チャネルから前記無線端末に割り当てる１つの通信チャネルを決定し、該通信チャネルを前記無線端末に割り当てる第二の処理を実行する手段と、
（３）前記無線端末に対して全ての通信チャネルを割り当てるまで前記第一の処理と前記第二の処理を繰り返す第三の処理を実行する手段と、
（４）前記第三の処理を実行する過程において、前記無線基地局から割り当てられる１つの通信チャネルが先に前記無線端末へ割り当てた通信チャネルに等しい、又は、前記無線端末に割り当てようとする通信チャネルの組み合わせでは前記無線端末と通信不可能であると判断し、その場合、前記無線基地局に対し通信チャネルの割り当てを再要求する手段とを備え、
前記無線中継装置は、前記無線端末に対し通信可能な全ての通信チャネルを割り当てることで通信チャネルの割当処理を終了することを特徴とする無線中継装置。In a radio relay apparatus in a radio communication system, comprising a radio base station, a radio terminal, and a radio relay apparatus, wherein the radio terminal and the radio base station communicate via the radio relay apparatus,
The wireless repeater device is
(1) When a call connection request is received from the radio terminal, the radio base station is requested for one communication channel between the radio base station and the radio relay device, and one radio channel is transmitted from the radio base station. Means for executing a first process assigned to
(2) means for determining a communication channel to be allocated to the radio terminal from the communication channel and control channel allocated from the radio base station, and executing a second process of allocating the communication channel to the radio terminal;
(3) means for executing a third process that repeats the first process and the second process until all communication channels are allocated to the wireless terminal;
(4) In the process of executing the third processing, one communication channel allocated from the radio base station is equal to a communication channel allocated to the radio terminal first, or communication to be allocated to the radio terminal It is determined that communication with the wireless terminal is impossible in a combination of channels, and in that case, comprises means for re-requesting allocation of a communication channel to the wireless base station,
The wireless relay device ends communication channel assignment processing by assigning all communication channels that can be communicated to the wireless terminal.
JP22946199A 1999-08-13 1999-08-13 Wireless communication system, wireless channel allocation method, and wireless relay device Expired - Fee Related JP3613384B2 (en)

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