JP2004328164A - Wireless communication system and wireless relaying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system and a wireless relaying apparatus capable of relaying information without extending a time depending on a position of a transmitter when the transmitter transmits the information to a receiver in the case of unidirectional transmission. <P>SOLUTION: Each relaying apparatus is provided with a storage means for storing unique relaying apparatus numbers of relaying apparatuses and mutual communication available relational table. Each relaying apparatus is classified into a class depending on the number of relaying times on the basis of a relaying apparatus number of a base point relaying apparatus whose number of relaying times is minimum and the mutual communication available relational table in the case of relaying information from the transmitter. Further, the priority is assigned to each relaying apparatus so that a higher priority is placed onto the relaying apparatus located closer to the transmitter within the same class on the basis of the relaying apparatus number. Moreover, each relaying apparatus transfers the information from the transmitter according to the priority in its own class after all the relaying apparatuses in other class adjacent to the transmitter with respect to its own class transfer the information from the transmitter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００４１】
例えば、中継器３１は中継器３２〜３４と相互通信可能であり、中継器３２は中継器３１，３４，３５と相互通信可能であり、その他中継器については、（表１）の通りである。
【００４２】
また、第１実施形態の各中継器は、送信器からのフレームを中継する場合に、送信器からのフレームの最小中継回数が最小となる基点の中継器の中継器番号および相互通信可能関係テーブルを基に、送信器からの最小中継回数で決まる階層に区分される一方、同一階層内では中継器番号を基に、各階層間では送信器側の階層ほどより上位となるように、優先順位が割り当てられることを第１の特徴とする。
【００４３】
ここで、階層の区分については、例えば、送信器１１の場合、最小中継回数が１回となる中継器３１が第１階層に区分され、最小中継回数が２回となる中継器３２〜３４が第２階層に区分され、最小中継回数が３回となる中継器３５〜３７が第３階層に区分される。これに対して、送信器１２の場合、最小中継回数が１回となる中継器３５が第１階層に区分され、最小中継回数が２回となる中継器３２，３４，３７が第２階層に区分され、最小中継回数が３回となる中継器３１，３３．３６が第３階層に区分される。
【００４４】
優先順位の割当てについては、例えば、送信器１１の場合、第１階層の中継器３１、第２階層の中継器３２〜３４、第３階層の中継器３５〜３７の順番に優先順位が低くなるように、そして複数の中継器を含む第２階層および第３階層においては、中継器番号が大きいほど優先順位が低くなるように、各中継器に優先順位が割り当てられる。この場合、中継器に付した符号を中継器番号とすると、優先順位は、中継器３１、中継器３２、中継器３３、中継器３４、中継器３５、中継器３６、中継器３７の順番に低くなる。この場合、中継器３１〜３７には、それぞれ優先順位“１”〜“７”が割り当てられるとする。
【００４５】
これに対し、送信器１２の場合、第１階層の中継器３５、第２階層の中継器３２，３４，３７、第３階層の中継器３１，３３，３６の順番に優先順位が低くなるように、そして複数の中継器を含む第２階層および第３階層においては、中継器番号が大きいほど優先順位が低くなるように、各中継器に優先順位が割り当てられる。この場合、優先順位は、中継器３５、中継器３２、中継器３４、中継器３７、中継器３１、中継器３３、中継器３６の順番に低くなる。
【００４６】
なお、上記送信器１１，１２の場合において、優先順位は、中継器番号が小さいほど優先順位が低くなるようにしてもよい。
【００４７】
さらに、第１実施形態の各中継器は、互いに隣接する両階層のうち、最小中継回数の少ない上位側の階層内における一の中継器から送信されたフレームが、中継回数の多い下位側の階層内における各中継器により受信されるように配置され、自己の階層に対して送信器側に隣接する他の階層内における全中継器が、送信器からの情報を転送した後に、自己の階層内における優先順位に従って送信器からの情報を転送することを第２の特徴としている。
【００４８】
この場合、中継器に割り当てられた優先順位を「ＰＮｍ」とし、更新前のフレーム内における中継器番号から特定される優先順位を「ＰＮｆ」としたとき、
（ＰＮｍ−ＰＮｆ−１）×Ｔｆ
の式を用いた演算で得られる時間後にフレームが転送される。ただし、Ｔｆは１フレーム分相当の転送時間である。
【００４９】
次に、第１実施形態の特徴となる動作について説明する。図２に示すように、期間Ｔ１で送信器１１から送信されたフレームは、第１階層の中継器３１により受信され、期間Ｔ２で即座に転送される。ここで、中継器３１によるフレームの転送タイミングは、上式の括弧内の第１項が（１−０−１）により“０”となるので、期間Ｔ２で即座となる。
【００５０】
期間Ｔ２で転送されたフレームは、第２階層の中継器３２〜３４により受信されるので、期間Ｔ３で即座に優先順位“２”の中継器３２により転送され、１フレーム分相当の転送時間後の期間Ｔ４で優先順位“３”の中継器３３により転送され、２フレーム分相当の転送時間後の期間Ｔ５で優先順位“４”の中継器３４により転送される。ここで、中継器３２による転送タイミングは、第１項が（２−１−１）により“０”となるので即座となる。中継器３３による転送タイミングは、第１項が（３−１−１）により“１”となるので、１フレーム分相当の転送時間後となる。中継器３４による転送タイミングは、第１項が（４−１−１）により“２”となるので、２フレーム分相当の転送時間後となる。
【００５１】
期間Ｔ３で転送されたフレームは、中継器３１，３４，３５により受信されるが、中継器３１，３４により破棄されるので、実質的に第３階層の中継器３５により受信されることになる。この場合、中継器３５は、第２階層における全中継器がフレームを送信していないので、転送を保留し、第１項が（５−２−１）により“２”となるので、期間Ｔ４から２フレーム分相当の転送時間後の期間Ｔ６でフレームを転送する。
【００５２】
期間Ｔ４で転送されたフレームは、中継器３１，３４，３６により受信されるが、中継器３１，３４により破棄されるので、実質的に第３階層の中継器３６により受信されることになる。この場合も、中継器３６は、転送を保留し、第１項が（６−３−１）により“２”となるので、期間Ｔ５から２フレーム分相当の転送時間後の期間Ｔ７でフレームを転送する。
【００５３】
期間Ｔ５で転送されたフレームは、中継器３１〜３３，３５〜３７により受信されるが、中継器３１〜３３，３５，３６により破棄されるので、実質的に第３階層の中継器３７により受信されることになる。この場合は、第２階層における全中継器がフレームを送信したことになるので、第３階層の各中継器により受信されたフレームが、それぞれの優先順位に従って転送されることになる。中継器３７は、第１項が（７−４−１）により“２”となるので、期間Ｔ６から２フレーム分相当の転送時間後の期間Ｔ８でフレームを転送する。
【００５４】
期間Ｔ６で転送されたフレームは、中継器３２，３４，３７により受信されるが、全て破棄される。
【００５５】
期間Ｔ７で転送されたフレームは、中継器３３，３４，３７および受信器２１により受信されるが、中継器３３，３４，３７により破棄され、実質的に受信器２１により受信されることになる。
【００５６】
期間Ｔ８で転送されたフレームは、中継器３４〜３６および受信器２１により受信されるが、全て破棄される。
【００５７】
以上により、送信器１１から受信器２１への単方向にデータが、中継器を経由して転送されることになる。
【００５８】
上記の動作説明は、送信器１１の場合であったが、送信器１２の場合も上記と同様に、送信器１２から受信器２１への単方向にデータが、中継器を経由して転送されることになる。
【００５９】
すなわち、第１期間で送信器１２から送信されたフレームは、第１階層の中継器３５により受信され、第２期間で即座に転送される。
【００６０】
第２期間で転送されたフレームは、第２階層の中継器３２，３４，３７により受信されるので、第３期間で即座に中継器３２により転送され、１フレーム分相当の転送時間後の第４期間で中継器３４により転送され、２フレーム分相当の転送時間後の第５期間で中継器３７により転送される。
【００６１】
第３期間で転送されたフレームは、中継器３１，３４により受信されるが、中継器３４により破棄されるので、実質的に第３階層の中継器３１により受信されることになる。
【００６２】
第４期間で転送されたフレームは、中継器３１〜３３，３５〜３７により受信されるが、中継器３１，３２，３５，３７により破棄されるので、実質的に第３階層の中継器３３，３６により受信されることになる。
【００６３】
第５期間で転送されたフレームは、中継器３４〜３６および受信器２１により受信されるが、中継器３４〜３６により破棄されるので、実質的に受信器２１により受信されることになる。この後も、同様な中継処理が行われる。
【００６４】
以上のように、第１実施形態によれば、単向送信の場合に、送信器から受信器にフレームを送るとき、送信器の位置によって時間を長くすることなく、中継することが可能となる。
【００６５】
（第２実施形態）
図３は本発明による第２実施形態の無線通信システムの動作説明図である。
【００６６】
第２実施形態の無線通信システムは、送信器１１（１２）と、受信器２１とを第１実施形態の無線通信システムと同様に備えているほか、第１実施形態の無線通信システムと相違する各中継器を備えている。
【００６７】
第２実施形態の各中継器は、第１実施形態の第１の特徴に代えて、送信器からのフレームを中継する場合に、送信器からのフレームの最小中継回数が最小となる基点の中継器の中継器番号および相互通信可能関係テーブルを基に、送信器からの中継回数で決まる階層に区分される一方、基点の中継器を含む最小中継回数の最も少ない階層に隣接する階層から、最小中継回数の最も多い階層にかけて、基点の中継器からそれら各階層毎に一の中継器を経て形成されそれら各階層を貫く複数の中継経路においては、一の中継経路と別の中継経路とが互いに上位下位の関係となるように、各階層間では中継器番号を基に、優先順位が割り当てられることを第１の特徴とする。
【００６８】
ここで、図１の例の構成でも第２実施形態の第１の特徴を満足するので、図１を兼用して、より具体的に説明する。送信器１１の場合、基点の中継器３１から複数の中継経路が各階層を貫くように形成されるが、それら複数の中継経路のうち、第１の中継経路は中継器３２，２５により形成され、第２の中継経路は中継器３４，３７により形成され、第３の中継経路は中継器３３，３６により形成される。そして、優先順位“１”〜“７”は、それぞれ中継器３１，３２，３５，３４，３７，３６，３３に割り当てられるとする。なお、これに限らず、優先順位“１”〜“７”は、各中継経路の上位側にある中継器の中継器番号を基に、中継器３１，３２，３５，３３，３６，３４，３７に割り当てられるようにしてもよい。
【００６９】
これに対して、送信器１２の場合、優先順位“１”〜“７”は、それぞれ中継器３５，３２，３１，３４，３３，３６，３７に割り当てられるとする。なお、これに限らず、優先順位“１”〜“７”は、各中継経路の上位側にある中継器の中継器番号を基に、中継器３５，３２，３１，３４，３３，３７，３６に割り当てられるようにしてもよい。
【００７０】
上記構成の無線通信システムでは、図３に示すように、期間Ｔ１で送信器１１から送信されたフレームは、第１階層の中継器３１により受信され、期間Ｔ２で即座に転送される。ここで、中継器３１によるフレームの転送タイミングは、上式の第１項が（１−０−１）により“０”となるので、期間Ｔ２で即座となる。
【００７１】
期間Ｔ２で転送されたフレームは、第２階層の中継器３２〜３４により受信され、期間Ｔ３で即座に中継器３２により転送され、２フレーム分相当の転送時間後の期間Ｔ５で中継器３４により転送され、５フレーム分相当の転送時間後の期間Ｔ８で中継器３３により転送される。ここで、中継器３２による転送タイミングは、第１項が（２−１−１）により“０”となるので即座となる。中継器３４による転送タイミングは、第１項が（４−１−１）により“２”となるので、期間Ｔ３から２フレーム分相当の転送時間後の期間Ｔ５となる。中継器３３による転送タイミングは、第１項が（７−１−１）により“５”となるので、期間Ｔ３から５フレーム分相当の転送時間後の期間Ｔ８となる。
【００７２】
期間Ｔ３で転送されたフレームは、中継器３１，３４，３５により受信されるが、中継器３１，３４により破棄されるので、実質的に第３階層の中継器３５により受信されることになる。この場合、中継器３５は、第１項が（３−２−１）により“０”となるので、期間Ｔ４で即座にフレームを転送する。
【００７３】
期間Ｔ４で転送されたフレームは、中継器３２，３４，３７により受信されるが、中継器３２，３４により破棄されるので、実質的に第３階層の中継器３７により受信されることになる。この場合、中継器３７は、第１項が（５−３−１）により“１”となるので、期間Ｔ５から１フレーム分相当の転送時間後の期間Ｔ６にフレームを転送する。
【００７４】
期間Ｔ５で転送されたフレームは、中継器３１〜３３，３５〜３７により受信されるが、中継器３１〜３３，３５，３７により破棄されるので、実質的に第３階層の中継器３６により受信されることになる。この場合、中継器３６は、第１項が（６−４−１）により“１”となるので、期間Ｔ６から１フレーム分相当の転送時間後の期間Ｔ７にフレームを転送する。
【００７５】
期間Ｔ６で転送されたフレームは、中継器３４〜３６および受信器２１により受信されるが、中継器３４〜３６により破棄されるので、実質的に受信器２１により受信されることになる。
【００７６】
期間Ｔ７で転送されたフレームは、中継器３３，３４，３７および受信器２１により受信されるが、全て破棄される。
【００７７】
期間Ｔ８で転送されたフレームは、中継器３１，３４，３６により受信されるが、全て破棄される。
【００７８】
以上により、送信器１１から受信器２１への単方向にデータが、中継器を経由して転送されることになる。また、送信器１２の場合も上記と同様に、送信器１２から受信器２１への単方向にデータが、中継器を経由して転送されることになる。
【００７９】
すなわち、第１期間で送信器１２から送信されたフレームは、第１階層の中継器３５により受信され、第２期間で即座に転送される。
【００８０】
第２期間で転送されたフレームは、第２階層の中継器３２，３４，３７により受信され、第３期間で即座に中継器３２により転送され、２フレーム分相当の転送時間後の第５期間で中継器３４により転送され、５フレーム分相当の転送時間後の第８期間で中継器３７により転送される。
【００８１】
第３期間で転送されたフレームは、中継器３１，３４，３５により受信されるが、中継器３４，３５により破棄されるので、実質的に第３階層の中継器３１により受信されることになる。この場合、中継器３１は、第１項が（３−２−１）により“０”となるので、第４期間で即座にフレームを転送する。
【００８２】
第４期間で転送されたフレームは、中継器３２〜３４により受信されるが、中継器３２，３４により破棄されるので、実質的に第３階層の中継器３３により受信されることになる。この場合、中継器３３は、第１項が（５−３−１）により“１”となるので、第５期間から１フレーム分相当の転送時間後の第６期間にフレームを転送する。
【００８３】
第５期間で転送されたフレームは、中継器３１〜３３，３５〜３７により受信されるが、中継器３１〜３３，３５，３７により破棄されるので、実質的に第３階層の中継器３６により受信されることになる。この場合、中継器３６は、第１項が（６−４−１）により“１”となるので、第６期間から１フレーム分相当の転送時間後の第７期間にフレームを転送する。
【００８４】
第６期間で転送されたフレームは、中継器３１，３４，３６により受信されるが、全て破棄される。
【００８５】
第７期間で転送されたフレームは、中継器３３，３４，３７および受信器２１により受信されるが、中継器３３，３４，３７により破棄されるので、実質的に受信器２１により受信されることになる。
【００８６】
第８期間で転送されたフレームは、中継器３４，３５，３６および受信器２１により受信されるが、全て破棄される。
【００８７】
以上のことから、第２実施形態でも、単向送信の場合に、送信器から受信器にフレームを送るとき、送信器の位置によって時間を長くすることなく、中継することが可能となる。
【００８８】
（第３実施形態）
図４は本発明による第３実施形態の無線通信システムで用いられるフレームの構成図である。
【００８９】
第３実施形態の無線通信システムは、第１または第２実施形態の無線通信システムとの相違点として、図１３に示した構成のフレームに代えて、図４に示す構成のフレームを用いることを特徴とする。
【００９０】
すなわち、第３実施形態の各中継器は、送信器からのフレームを最初に受信した場合には、送信器からの情報を、当該中継器が送信器からのフレームを最初に受信したことを示す基点情報とともに他の中継器に向けて転送することを第１の特徴とする。具体的には、第１または第２実施形態と同様の送信器からのフレーム内の情報を、図４に示す基点情報としての第１中継器番号とともに、第３実施形態のフレームとして転送するのである。
【００９１】
また、第３実施形態の各中継器は、送信器からの情報を基点情報とともに受信した場合には、基点情報および相互通信可能関係テーブルを基に、送信器からの最小中継回数を求め、この最小中継回数で決まる階層に自己を区分する一方、第１または第２実施形態と同様にして優先順位を自己に割り当て、送信器からの情報を転送するときにその情報を上記基点情報とともに転送する。
【００９２】
ここで、送信器は、フレーム内の中継器番号を“０”に初期設定すると既に説明したが、第１中継器番号をも“０”に初期設定する。そして、送信器からのフレームを最初に受信した中継器のみが、そのフレーム内の“０”に初期設定された第１中継器番号を、自己の記憶手段に記憶されている中継器番号に書き換えることができ、その他の中継器に対しては第１中継器番号の書換えが禁止される。また、各中継器は、受信したフレーム内の識別符号およびフレーム番号とともに第１中継器番号を記憶し、識別符号およびフレーム番号を、従来と同様に受信済みのフレームを破棄するために利用し、第１中継器番号を、第３実施形態の特徴として送信器からの最小中継回数を求める場合に利用する。その他は第１または第２実施形態で説明した通りである。
【００９３】
（第４実施形態）
図５は本発明による第４実施形態の無線通信システムで用いられるフレームの構成図である。
【００９４】
第４実施形態の無線通信システムは、第１または第２実施形態の無線通信システムとの相違点として、図１３に示した構成のフレームに代えて、図５に示す構成のフレームを用いることを特徴とする。
【００９５】
すなわち、第４実施形態では、送信器は、データを、プリアンブルと、ユニークワードと、識別符号と、フレーム番号と、例えば“０”に初期設定された中継器数とともに送信するように構成される。
【００９６】
各中継器は、送信器からのフレームを最初に受信した場合には、送信器からのフレームの最小中継回数が最小となる基点の中継器となる自己の中継器番号および相互通信可能関係テーブルを基に、各中継器について最小中継回数を求め、これらの最小中継回数で決まる各階層に各中継器をそれぞれ区分する一方、第１または第２実施形態と同様にして各中継器に優先順位を割り当て、送信器からのフレーム内の情報を、各中継器の中継器番号およびこれら中継器番号にそれぞれ対応付けた優先順位とともに他の各中継器に向けて転送するのである。より具体的には、送信器からのフレームを最初に受信した中継器は、同フレーム内の中継器番号を自己の中継器番号に書き換え、同フレーム内の中継器数を“１”増分し、そして、上記優先順位の順番に中継器の中継器番号を格納した第１〜第ｎ中継器番号を付加することにより、同フレームの更新をし、この更新後のフレームを転送する。つまり、優先順位“１”の当該中継器の中継器番号が第１中継器番号に格納され、優先順位“２”の中継器の中継器番号が第２中継器番号に格納され、同様にして優先順位“３”以降の中継器の中継器番号が第３中継器番号以降に格納される。
【００９７】
また、第４実施形態の各中継器は、送信器からの情報を各中継器番号および各優先順位とともに受信した場合には、送信器からのフレームを転送するときに、その情報を各中継器番号および各優先順位とともに転送する。より具体的には、送信器からのフレーム内の中継器番号を自己の中継器番号に書き換え、同フレーム内の中継器数を“１”増分することにより、送信器からのフレームの更新がなされ、この更新後のフレームが転送される。
【００９８】
次に、上記構成の無線通信システムの動作について、図１，図２を兼用しながら説明する。
【００９９】
例えば、送信器１１の場合、送信器１１は、期間Ｔ１で、送信するべきデータを、プリアンブルと、ユニークワードと、識別符号と、フレーム番号と、“０”に初期設定された中継器数とともにフレームとして送信する。
【０１００】
期間Ｔ１で送信されたフレームは、中継器３１により受信される。中継器３１は、同フレーム内の中継器数が“０”であることから、各中継器に対する最小中継回数を求め、各中継器をこの最小中継回数で決まる階層に区分するとともに、各中継器の中継器番号を基に各中継器に優先順位を割り当てる。この場合、第１実施形態と同様に、当該中継器３１が第１階層に区分され、中継器３２〜３４が第２階層に区分され、中継器３５〜３７が第３階層に区分される。そして、優先順位は、中継器３１、中継器３２、中継器３３、中継器３４、中継器３５、中継器３６、中継器３７の順番に低くなるように、各中継器に割り当てられる。
【０１０１】
この後、中継器３１は、送信器１１からのフレーム内の中継器番号を自己の中継器番号に書き換え、同フレーム内の中継器数を“１”増分し、そして、上記優先順位の順番に中継器の中継器番号を格納した第１〜第ｎ中継器番号を付加することにより、同フレームの更新をし、この更新後のフレームを期間Ｔ２で即座に転送する。この場合、第ｎ中継器番号は第７中継器番号となり、第１〜第７中継器番号に、それぞれ中継器３１〜３７の中継器番号が格納される。
【０１０２】
期間Ｔ２で送信されたフレームは、中継器３２〜３４により受信される。中継器３２は、同フレーム内の第１〜第７中継器番号のうち、自己の中継器番号が含まれている第２中継器番号を検索し、自己に第２位の優先順位が割り当てられていることを検出し、第１項が（２−１−１）により“０”になるので、期間Ｔ３で即座に同フレームを更新後のフレームにて転送する。
【０１０３】
中継器３３は、同フレーム内の第１〜第７中継器番号のうち、自己の中継器番号が含まれている第３中継器番号を検索し、自己に第３位の優先順位が割り当てられていることを検出し、第１項が（３−１−１）により“１”になるので、期間Ｔ２から１フレーム分相当の転送時間後の期間Ｔ４で同フレームを転送する。
【０１０４】
中継器３４は、同フレーム内の第１〜第７中継器番号のうち、自己の中継器番号が含まれている第４中継器番号を検索し、自己に第４位の優先順位が割り当てられていることを検出し、第１項が（４−１−１）により“２”になるので、期間Ｔ２から２フレーム分相当の転送時間後の期間Ｔ５で同フレームを転送する。
【０１０５】
期間Ｔ３で送信されたフレームは、中継器３１，３４，３５により受信されるが、中継器３１，３４により破棄されるので、実質的に第３階層の中継器３５により受信されることになる。この場合、中継器３５は、第１項が（５−２−１）により“２”となるので、期間Ｔ４から２フレーム分相当の転送時間後の期間Ｔ６でフレームを転送する。
【０１０６】
これ以降も同様な動作となり、第１実施形態と同様に、送信器１１から受信器２１への単方向にデータが、中継器を経由して転送されることになる。
【０１０７】
（第５実施形態）
図６〜図８は本発明による第５実施形態の無線通信システムによる相互通信可能関係テーブルの作成動作説明図、図９〜図１１は同作成動作時に使用されるフレームの構成図である。
【０１０８】
第５実施形態の無線通信システムは、第１から第４実施形態のいずれかの無線通信システムとの相違点として、各中継器が、設置時に同報通信を行うことにより、相互通信可能関係の情報をやり取りしながら、相互通信可能関係テーブルを作成して記憶保持することを特徴とする。
【０１０９】
次に、図１を兼用して、第５実施形態の特徴となる動作について説明する。中継器３１を設置して電源を投入すると、中継器３１は、図６に示すように、所定の通信シーケンスに従って、相互通信可能関係の情報を得るべく、図９に示す同報フレームを送信して同報通信を行う。この場合、他の中継器がまだ設置されていないのでタイムアウトになり、中継器３１により、次の（表２）の相互通信可能関係テーブルが作成され、記憶保持される。
【０１１０】
【表２】

【０１１１】
この後、中継器３２を設置して電源を投入すると、中継器３２は、図７に示すように、所定の通信シーケンスに従って、相互通信可能関係の情報を得るべく、同報通信を行う。この場合、中継器３１が応答するので、中継器３１，３２により、次の（表３）の相互通信可能関係テーブルが作成され、記憶保持される。
【０１１２】
【表３】

【０１１３】
ここで、図７において、中継器３２が電源投入後に同報フレームを送信する。これを受信した中継器３１は、乱数により決定される待ち時間後に、図１０の宛先指定フレームにより、宛先中継器番号を中継器３２の中継器番号にした（中継器３２を指定した）リンク要求フレームを送信する。これを受信した中継器３２は、宛先指定フレームにより中継器３１を指定したリンク応答フレームを送信する。これを受信した中継器３１は、（表２）の相互通信可能関係テーブルを中継器３２に転送する。これを受信した中継器３２は、自局と中継器３１との相互通信可能関係を追加して（表３）の相互通信可能関係テーブルを作成し、これを記憶保持する。この後、他に中継器が存在しないのでタイムアウトになり、中継器３２は、（表３）の相互通信可能関係テーブルを中継器３１に送信する。中継器３１は、（表２）の相互通信可能関係テーブルに代えて（表３）の相互通信可能関係テーブルを記憶保持する。
【０１１４】
この後、中継器３３を設置して電源を投入すると、中継器３３は、図８に示すように、所定の通信シーケンスに従って、相互通信可能関係の情報を得るべく、同報通信を行う。この場合、中継器３１〜３３により、次の（表４）の相互通信可能関係テーブルが作成され、記憶保持される。
【０１１５】
【表４】

【０１１６】
ここで、図８において、中継器３３が電源投入後に同報フレームを送信する。これを受信した中継器３１は、乱数により決定される待ち時間後に、宛先指定フレームにより中継器３３を指定したリンク要求フレームを送信する。これを受信した中継器３３は、宛先指定フレームにより中継器３１を指定したリンク応答フレームを送信する。これを受信した中継器３１は、（表３）の相互通信可能関係テーブルを中継器３３に送信する。これを受信した中継器３３は、自局と中継器３１との相互通信可能関係を追加して（表４）の相互通信可能関係テーブルを作成し、これを記憶保持する。この後、他に（直接）相互通信可能な中継器が存在しないのでタイムアウトになり、中継器３３は、（表４）の相互通信可能関係テーブルを中継器３１に送信する。中継器３１は、そのテーブルを受信すると（表３）の相互通信可能関係テーブルに代えて記憶保持する。
【０１１７】
この後、中継器３３は、（表４）の相互通信可能関係テーブルから、相互通信可能でない中継器を検索し、中継器３２を発見するので、図１１の中継経路指定フレームにより、宛先中継器番号で中継器３２を指定するとともに、その中継器３２までの中継器を、中継器台数および第１〜第ｎ中継器番号で指定することにより、相互通信可能な中継器３１を経由して中継器３２に（表４）の相互通信可能関係テーブルを送信する。この場合、中継器台数には“１”が格納され、第ｎ中継器番号が第１中継器番号となり、これに中継器３１の中継器番号が格納されることになる。
【０１１８】
（表４）の相互通信可能関係テーブルを受信した中継器３１は、中継器台数および第１〜第ｎ中継器番号を見て、同フレームを中継器３２に転送し、同フレームにより（表４）の相互通信可能関係テーブルを受信した中継器３２がそれを記憶保持する。
【０１１９】
このようにして中継器３４〜３７を順次設置していけば、各中継器が（表１）の相互通信可能関係テーブルを記憶保持することになる。
【０１２０】
（第６実施形態）
本発明による第６実施形態の無線通信システムは、第１から第５実施形態のいずれかの無線通信システムとの相違点として、各中継器が、相互通信可能関係テーブルを常時更新することを特徴とする。
【０１２１】
例えば、図３において、中継器３２が、期間Ｔ３でフレームを転送した後に、自己と同じ階層で自己よりも優先順位が低く相互通信可能関係にある中継器３４から、期間Ｔ５でフレームを受信しなかった場合、中継器３２は、中継器３４に対する受信不可カウントを“１”増分し、受信不可カウント値が所定値以上であれば、受信不可カウントをリセットし、中継器３２，３４間の相互通信可能関係を可から不可に訂正することにより、自己の相互通信可能関係テーブルの更新を行う。この後、中継器３２は、上記更新後の相互通信可能関係テーブルを、同報フレームにより送信する。これにより、同報フレームを受信した各中継器が、自己の相互通信可能関係テーブルに代えて上記更新後の相互通信可能関係テーブルを記憶保持する。
【０１２２】
この後、中継器３２が、期間Ｔ３でフレームを転送した後に、自己と同じ階層で自己よりも優先順位が低く相互通信可能関係にある中継器３４から、期間Ｔ５でフレームを受信した場合、中継器３２は、中継器３４に対する受信可カウントを“１”増分し、受信可カウント値が所定値以上であれば、受信可カウントをリセットし、中継器３２，３４間の相互通信可能関係を不可から可に訂正することにより、自己の相互通信可能関係テーブルの更新を行う。この後、中継器３２は、上記更新後の相互通信可能関係テーブルを、同報フレームにより送信する。これにより、同報フレームを受信した各中継器が、自己の相互通信可能関係テーブルに代えて上記更新後の相互通信可能関係テーブルを記憶保持する。
【０１２３】
このように、各中継器が、相互通信可能関係テーブルを常時更新するようにすれば、適切な伝送経路で送信器から受信器への単方にデータを送信することができる。
【０１２４】
【発明の効果】
以上のことから明らかなように、請求項１、２記載の発明によれば、単向送信の場合に、送信器から受信器への情報を送るとき、送信器の位置によって時間を長くすることなく、中継することが可能となる。
【０１２５】
請求項３、４記載の発明によれば、自動的に、各中継器を各階層に区分することができるとともに、各中継器に優先順位を割り当てることができる。
【０１２６】
請求項５、６記載の発明によれば、自動的に、相互通信可能関係を示す情報を各中継器に記憶保持させることができる。
【０１２７】
請求項７記載の発明によれば、本発明の無線中継器を使用することにより、単向送信の場合に、送信器から受信器への情報を送るとき、送信器の位置によって時間を長くすることなく、中継することが可能となる。
【図面の簡単な説明】
【図１】本発明による第１実施形態の無線通信システムの構成図である。
【図２】同無線通信システムの動作説明図である。
【図３】本発明による第２実施形態の無線通信システムの動作説明図である。
【図４】本発明による第３実施形態の無線通信システムで用いられるフレームの構成図である。
【図５】本発明による第４実施形態の無線通信システムで用いられるフレームの構成図である。
【図６】本発明による第５実施形態の無線通信システムによる相互通信可能関係テーブルの作成動作説明図である。
【図７】同相互通信可能関係テーブルの作成動作説明図である。
【図８】同相互通信可能関係テーブルの作成動作説明図である。
【図９】同作成動作時に使用されるフレームの構成図である。
【図１０】同作成動作時に使用されるフレームの構成図である。
【図１１】同作成動作時に使用されるフレームの構成図ある。
【図１２】従来の単向送信式の無線通信システムの構成図である。
【図１３】同無線通信システムで用いられるフレームの構成図である。
【図１４】同無線通信システムの動作説明図である。
【図１５】同無線通信システムの課題の説明図である。
【図１６】同無線通信システムの課題の説明図である。
【符号の説明】
１１，１２ 送信器
２１ 受信器
３１〜３７ 中継器[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless communication system including a transmitter for wireless transmission, a receiver for wireless reception, and a plurality of repeaters for wireless transmission and reception for transferring information transmitted from the transmitter to the receiver. It relates to a repeater.
[0002]
[Prior art]
FIG. 12 is a configuration diagram of a conventional one-way transmission wireless communication system, FIG. 13 is a configuration diagram of a frame used in the wireless communication system, and FIG. 14 is an operation explanatory diagram of the wireless communication system.
[0003]
The wireless communication system shown in FIG. 12 includes a transmitter 11, a receiver 21, and a plurality of repeaters 31PA and 32PA, and unidirectionally transmits data from the transmitter 11 to the receiver 21 and transmits the data to the repeaters 31PA and 31PA. This is a digital wireless communication system for transmitting by wireless communication using a frame as shown in FIG. 13 via 32PA.
[0004]
The transmitter 11 includes wireless transmission means for transmitting data by wireless communication using the frame, and storage means for storing an identification code assigned to the transmitter 11 in advance, and stores data to be transmitted in the frame. What to send. That is, the transmitter 11 converts the data into a preamble for bit synchronization, a unique word for frame synchronization, an identification code of the transmitter 11, a frame number of a cyclic (modulo) type assigned to the frame, for example, " It is configured to transmit with the relay number initialized to 0 ”.
[0005]
The receiver 21 stores wireless receiving means for receiving data by wireless communication using the frame, and stores, for example, an identification code of the transmitter 11 registered in advance at the time of installation, and a frame number and an identification code in a previously received frame. Storage means for receiving data from the transmitter 11. That is, when the receiver 21 receives the frame by the wireless receiving unit, the receiver 21 compares the identification code in the frame with the identification code stored in the storage unit, and when a comparison result that matches both is obtained, If the frame number in the same frame is older than the frame number of the next frame to be received, which is obtained from the previously received frame number stored in the storage means, discard the currently received frame; otherwise, The frame received this time is configured to be received as addressed to the receiver 21.
[0006]
The repeater 31PA indicates a wireless transmitting / receiving means for transferring data by wireless communication using the frame, and indicates, for example, an identification code of the transmitter 11 registered in advance at the time of installation, and a priority order of transfer timing assigned to the repeater 31PA in advance. A storage unit for storing a relay number (here, for example, “1”), a frame number in a previously received frame, an identification code, and the like is provided, and transfers data from the transmitter 11.
[0007]
Similarly, the repeater 32PA is provided with a wireless transmission / reception means for transferring data by wireless communication using the frame, for example, an identification code of the transmitter 11 registered in advance at the time of installation, and the priority assigned to the repeater 32PA in advance. And a storage unit for storing the relay number (“2”) shown therein, a frame number in a previously received frame, an identification code, and the like, for transferring data from the transmitter 11.
[0008]
When each of the repeaters receives the frame by the wireless transmission / reception unit, the relay unit compares the identification code in the frame with the identification code stored in the storage unit, and when a comparison result that matches both is obtained, If the frame number in the same frame is older than the frame number of the next frame to be received, which is obtained from the previously received frame number stored in the storage means, discard the currently received frame; otherwise, By replacing the relay number in the frame received this time with its own relay number stored in the storage unit, the relay number is updated, and the updated frame is transmitted from the wireless transmission / reception unit. Is done. As described above, by discarding the already received frame using the frame number, it is possible to prevent the same frame from being repeatedly relayed between the repeaters.
[0009]
Each repeater uses the relay number for the transfer timing of the frame to be transferred. That is, when each relay receives the frame from the transmitter 11, the relay number (“Nm”) stored in the storage unit is changed to the relay number (“Nf”) in the frame before the update. If it is larger, the frame is transferred after waiting for the time obtained by the calculation using the following equation.
[0010]
(Nm-Nf-1) × Tf
Here, Tf is a transfer time corresponding to one frame.
[0011]
On the other hand, if Nm is smaller than Nf, the value of the first term in the parentheses in the above equation becomes negative, so that the processing with the calculation result set to “0” is executed. For example, when the repeater 31PA directly receives the frame from the transmitter 11, the value of the first term becomes “0” according to (1-0-1), so that the updated frame is immediately transferred. On the other hand, when the repeater 32PA receives the frame from the transmitter 11 from the repeater 31PA, the value of the first term becomes “0” by (2-1-1), so that the updated value is immediately updated. On the other hand, when the frame is transferred and the frame is directly received from the transmitter 11, the value of the first term becomes “1” according to (2-0-1). Transfer the updated frame.
[0012]
In the wireless communication system configured as described above, since the transfer operation as shown in FIG. 14 is performed, it is possible to prevent the same frame from being repeatedly relayed, and to prevent simultaneous transmission of each repeater. It is possible to prevent collision of radio signals.
[0013]
In the example of FIG. 14, since the frame transmitted from the transmitter 11 in the period T1 is received by each of the repeaters 31PA and 32PA, the frame is immediately transferred by the repeater 31PA in the period T2 and one frame is transmitted. The transfer is performed by the repeater 32PA in a period T3 after a considerable transfer time. Here, the transfer timing by the repeater 31PA is after the reception of the frame transmitted from the transmitter 11 in the period T1 (period T2) because the value of the first term becomes “0” due to (1-0-1). Will be instant. Since the value of the first term is “1” due to (2-0-1), the transfer timing by the repeater 32PA is a period T3 after a transfer time equivalent to one frame from the period T2.
[0014]
The frame transferred in the period T2 is received only by the repeater 32PA because the transmitter 11 does not have the wireless receiving means, but the frame number in the frame is directly received by the repeater 32PA in the period T1. Since the frame number is the same as the frame number in the frame from the transmitted transmitter 11 and is older, it is discarded by the repeater 32PA.
[0015]
The frame transferred in the period T3 is received by each of the repeater 31PA and the receiver 21, and the frame number in the frame is the frame from the transmitter 11 directly received by the repeater 31PA in the period T1. Since it is the same as the frame number and the old one, it is discarded by the repeater 31PA. On the other hand, in the receiver 21, since the identification code that matches the identification code stored in the storage unit is included in the frame transferred in the period T3, the data in this frame is received. Become.
[0016]
In this way, the data is sent from the transmitter 11 to the receiver 21 in one direction by the repeaters 31PA and 32PA over the frame transfer time for the repeaters. In the examples of FIGS. 12 and 14, two repeaters are provided. However, it goes without saying that a configuration in which three or more repeaters are provided functions similarly.
[0017]
Japanese Patent Laid-Open Publication No. Hei 8-97821 (Patent Literature 1) discloses that if it is determined that direct communication cannot be performed, a relay station that passes through to reach a destination station is checked and an address of the relay station is included in a user data frame. A wireless data communication system that transmits information with information on the order in which the data is transmitted is disclosed.
[0018]
[Patent Document 1]
JP-A-8-97821
[0019]
[Problems to be solved by the invention]
However, the conventional wireless communication system shown in FIG. 12 has a problem that the time for relaying data in one direction from the transmitter 11 to the receiver 21 increases depending on the position of the transmitter 11.
[0020]
FIGS. 15 and 16 are explanatory diagrams of the above problem. As shown in FIG. 15, when the transfer is performed in the order of the repeater 32PA and the repeater 31PA, the transfer time of the frame becomes longer as shown in FIG.
[0021]
In FIG. 16, since the frame transmitted from the transmitter 11 in the period T1 has been received by the repeater 32PA, the value of the first term becomes “1” by (2-0-1). Is transferred by the repeater 32PA in a period T3 after a transfer time (“hold time” in the figure) equivalent to one frame from the data transfer.
[0022]
Since the frame transferred in the period T3 is received by the repeater 31PA, Nm is smaller than Nf, that is, since the value of the first term becomes negative by (1-2-1), the frame is immediately transmitted in the period T4. Is transferred by the repeater 31PA.
[0023]
The frame transferred in the period T4 is received by each of the repeater 32PA and the receiver 21. In the repeater 32PA, the frame number in the frame is changed to the frame directly received from the transmitter 11 in the period T1. It is the same as the frame number in and is discarded because it is old. On the other hand, in the receiver 21, since the identification code that matches the identification code stored in the storage means is included in the frame transferred in the period T4, the data in the frame is stored in the receiver shown in FIG. In this case, the data is received over a longer transfer time than the hold time.
[0024]
Further, in addition to the above arrangement, in the arrangement example shown in FIG. 12, when the frame from the transmitter 11 is directly received only by the repeater 32PA, the value of the first term is “2-0−1”. Since it becomes 1 ", the frame from the transmitter 11 is transferred by the repeater 32PA after a transfer time corresponding to one frame. Such a delay is longer when the number of repeaters is large and the closer the transmitter 11 is to the side of the receiver 21.
[0025]
In order to solve such a problem, an optimal repeater may be selected by a routing algorithm so that a transmission path is optimized. For example, according to the wireless data communication technology of Patent Document 1, it is possible to simply and quickly expand the range in which wireless communication is possible.
[0026]
However, in the above wireless data communication technology, the source station and each of the other stations check whether or not there is a station indicated by the destination address of the frame by searching within the own zone by broadcasting, and determine the station that has received the broadcasting frame. However, if it is a search target, it is necessary to detect the topology information by a broadcast chain in the zone, such as returning the information of the relay station to the transmission source, so that the receiver 21 having no return means is included. It cannot be applied to the one-way transmission wireless communication system.
[0027]
The present invention has been made in view of the above circumstances, and in the case of unidirectional transmission, when transmitting information from a transmitter to a receiver, it is possible to relay without increasing the time depending on the position of the transmitter. An object of the present invention is to provide a wireless communication system and a wireless repeater that can be used.
[0028]
[Means for Solving the Problems]
According to an aspect of the present invention, there is provided a wireless communication apparatus comprising: a transmitter for wireless transmission; and a receiver for wireless reception, and transfers information transmitted from the transmitter to the receiver. A wireless communication system including a plurality of repeaters for transmission and reception, wherein each of the plurality of repeaters stores unique repeater identification information and information indicating a direct mutual communicable relationship between the repeaters. Means, when relaying information from the transmitter, based on the repeater identification information of the base repeater and the information indicating the mutual communicable relationship where the number of relays of the information from the transmitter is minimized. , While being divided into layers determined by the number of relays from the transmitter, based on the repeater identification information within the same layer, the priority is higher among the layers such that the layer closer to the transmitter is higher. Assigned and self All relays in another layer adjacent to the transmitter side with respect to a layer transfer information from the transmitter according to the priority in its own layer after transferring information from the transmitter. It is characterized by.
[0029]
The invention according to claim 2 includes a transmitter for wireless transmission and a receiver for wireless reception, and a plurality of repeaters for wireless transmission and reception for transferring information transmitted from the transmitter to the receiver. A wireless communication system, wherein each of the plurality of repeaters includes storage means for storing unique repeater identification information and information indicating a direct mutual communicable relationship between the repeaters; When relaying information from the transmitter, based on the repeater identification information of the base repeater and the information indicating the mutual communicable relationship where the number of relays of information from the transmitter is minimized, the relay from the transmitter is performed. While being divided into layers determined by the number of times, from the layer adjacent to the layer with the lowest number of relays including the repeater at the base point to the layer with the highest number of relays, one from each of the layers from the repeater at the base point Repeater In a plurality of relay routes formed and passing through each hierarchy, priority is set based on repeater identification information between the hierarchies so that one relay route and another relay route have a higher-order and lower-order relationship with each other. , And transfers information from the transmitter in accordance with the priority order in its own relay path.
[0030]
According to a third aspect of the present invention, in the wireless communication system according to the first or second aspect, each of the plurality of repeaters receives information from the transmitter when information from the transmitter is first received. Is transferred to each of the other repeaters together with the base information indicating that the repeater is the base repeater, and when the information from the transmitter is received together with the base information, the base information is And, based on the information indicating the mutual communication possible relationship, the number of relays from the transmitter is determined, while dividing itself into a hierarchy determined by the number of relays, while assigning the priority to itself, the information from the transmitter Is transferred together with the base information.
[0031]
The invention according to claim 4 is the wireless communication system according to claim 1 or 2, wherein each of the plurality of repeaters receives the information from the transmitter for the first time, and The number of relays is determined for each of the plurality of repeaters based on the own repeater identification information and the information indicating the mutual communication possible relationship, and the plurality of repeaters are classified into respective layers determined by the number of relays. On the other hand, assigning the priority to each of the plurality of repeaters, the information from the transmitter, repeater identification information of the plurality of repeaters and a plurality of priorities respectively associated with these repeater identification information When the information from the transmitter is received together with the plurality of repeater identification information and the plurality of priorities, the information from the transmitter is transferred. When, characterized by transferring the information together with the plurality of repeater identification information and the plurality of priority.
[0032]
According to a fifth aspect of the present invention, in the wireless communication system according to any one of the first to fourth aspects, each of the plurality of repeaters exchanges information of an intercommunicable relationship by performing broadcast communication. Meanwhile, information indicating the mutual communicable relationship is created and stored in the storage unit.
[0033]
According to a sixth aspect of the present invention, in the wireless communication system according to any one of the first to fourth aspects, each of the plurality of repeaters is directly interconnected with itself obtained from information indicating the mutual communicable relationship. If information from the transmitter to be received is not received from another repeater having a communicable relationship, the mutual communicable relationship between the repeater and itself is disabled by disabling the mutual communicable relationship. The information indicating the communicable relationship is updated, and when information from the transmitter is received from another repeater, the mutual communicable relationship between the repeater and itself is enabled to enable the mutual communication. It is characterized in that information indicating a possible relationship is updated.
[0034]
The invention according to claim 7 is a wireless repeater as the repeater in the wireless communication system according to any one of claims 1 to 6.
[0035]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
FIG. 1 is a configuration diagram of a wireless communication system according to a first embodiment of the present invention, and FIG. 2 is an operation explanatory diagram of the wireless communication system.
[0036]
As shown in FIG. 1, the (digital) wireless communication system according to the first embodiment includes a transmitter 11 (12) and a receiver 21 similarly to the conventional wireless communication system shown in FIG. As a different point from the conventional wireless communication system, a plurality of repeaters 31 to 37 for transferring information transmitted from the transmitter 11 (12) to the receiver 21 are provided. However, in the first embodiment, instead of the “relay number” in FIG. 13, a frame including a “relay number” is used, and the repeater number is initialized to “0” by the transmitter, for example. .
[0037]
Each of the repeaters of the first embodiment includes a wireless transmission / reception unit that transfers data by wireless communication using the frame, an identification code of a transmitter registered in advance, a unique repeater number, an intercommunicable relation table, Storage means for storing a frame number, an identification code, and the like in the received frame, for transferring the frame from the transmitter.
[0038]
More specifically, each repeater compares the identification code in the frame received by the wireless transmission / reception unit with the identification code stored in the storage unit, and when a comparison result that matches both is obtained, If the frame number in the same frame is older than the frame number of the next frame to be received, which is obtained from the previously received frame number stored in the storage means, discard the currently received frame; otherwise, By replacing the repeater number in the frame received this time with its own repeater number stored in the storage means, the repeater number is updated, and the updated frame is transmitted from the wireless transmitting / receiving means. .
[0039]
Further, as shown in the following (Table 1), the mutual communicable relation table includes a direct mutual communicable relation between the repeaters indicated by solid lines in FIG. 1 as data.
[0040]
[Table 1]

[0041]
For example, the repeater 31 can communicate with the repeaters 32-34, the repeater 32 can communicate with the repeaters 31, 34, and 35, and the other repeaters are as shown in (Table 1). .
[0042]
Also, when relaying a frame from a transmitter, each relay of the first embodiment has a relay number and a mutual communicatable relationship table of a base relay that minimizes the minimum number of relays of the frame from the transmitter. Is divided into layers determined by the minimum number of relays from the transmitter, while in the same layer, based on the repeater number, priorities are set so that the layer closer to the transmitter is higher in each layer. Is assigned as a first feature.
[0043]
Here, regarding the division of the hierarchy, for example, in the case of the transmitter 11, the repeater 31 having the minimum number of relays of one is classified into the first layer, and the repeaters 32-34 having the minimum number of relays of two are classified into the first layer. Repeaters 35 to 37, which are divided into the second layer and whose minimum number of relays is three, are divided into the third layer. On the other hand, in the case of the transmitter 12, the repeater 35 having the minimum number of relays of one is divided into the first layer, and the repeaters 32, 34, and 37 having the minimum number of relays of two are included in the second layer. The repeaters 31, 33.36, which are classified and whose minimum number of relays is three, are classified into the third hierarchy.
[0044]
Regarding the assignment of the priority, for example, in the case of the transmitter 11, the priority is lower in the order of the first layer repeater 31, the second layer repeaters 32-34, and the third layer repeaters 35-37. As described above, in the second and third layers including a plurality of repeaters, the priority is assigned to each repeater such that the larger the repeater number, the lower the priority. In this case, assuming that the code assigned to the repeater is the repeater number, the priority order is repeater 31, repeater 32, repeater 33, repeater 34, repeater 35, repeater 36, and repeater 37 in this order. Lower. In this case, it is assumed that the repeaters 31 to 37 are assigned priority levels “1” to “7”, respectively.
[0045]
On the other hand, in the case of the transmitter 12, the priority is lowered in the order of the first layer repeater 35, the second layer repeaters 32, 34, 37, and the third layer repeaters 31, 33, 36. In the second and third layers including a plurality of repeaters, a priority is assigned to each repeater such that the larger the repeater number, the lower the priority. In this case, the priority becomes lower in the order of the repeater 35, the repeater 32, the repeater 34, the repeater 37, the repeater 31, the repeater 33, and the repeater 36.
[0046]
In the case of the transmitters 11 and 12, the priority may be set such that the lower the repeater number, the lower the priority.
[0047]
Further, each repeater of the first embodiment is configured such that a frame transmitted from one repeater in an upper layer having a smaller minimum number of relays among two layers adjacent to each other is a lower layer having a larger number of relays. Are arranged to be received by each of the repeaters in the same hierarchy, and all the repeaters in the other hierarchy adjacent to the transmitter side with respect to the own hierarchy transfer information from the transmitter, and then receive the information from the own hierarchy. The second feature is that information from the transmitter is transferred in accordance with the priority order in.
[0048]
In this case, when the priority assigned to the repeater is “PNm” and the priority specified from the repeater number in the frame before update is “PNf”,
(PNm-PNf-1) × Tf
The frame is transferred after the time obtained by the calculation using the equation. Here, Tf is a transfer time corresponding to one frame.
[0049]
Next, an operation that is a feature of the first embodiment will be described. As shown in FIG. 2, the frame transmitted from the transmitter 11 in the period T1 is received by the first-layer repeater 31, and is immediately transferred in the period T2. Here, the transfer timing of the frame by the repeater 31 is immediate in the period T2 because the first term in the parentheses in the above equation is "0" by (1-0-1).
[0050]
Since the frames transferred in the period T2 are received by the second-layer repeaters 32-34, they are immediately transferred by the repeater 32 of priority "2" in the period T3, and after a transfer time equivalent to one frame. Is transferred by the repeater 33 having the priority "3" in the period T4, and is transferred by the repeater 34 having the priority "4" in the period T5 after a transfer time equivalent to two frames. Here, the transfer timing by the repeater 32 is immediate because the first term is “0” by (2-1-1). The transfer timing by the repeater 33 is after the transfer time corresponding to one frame since the first term becomes “1” according to (3-1-1). The transfer timing by the repeater 34 is after the transfer time corresponding to two frames since the first term is “2” according to (4-1-1).
[0051]
The frame transferred in the period T3 is received by the repeaters 31, 34, and 35, but is discarded by the repeaters 31, 34, so that the frame is substantially received by the third-layer repeater 35. . In this case, the repeater 35 suspends the transfer because all the repeaters in the second hierarchy have not transmitted the frame, and the first term becomes “2” according to (5-2-1). The frame is transferred in a period T6 after a transfer time equivalent to two frames from.
[0052]
The frame transferred in the period T4 is received by the repeaters 31, 34, and 36, but is discarded by the repeaters 31, 34, so that the frame is substantially received by the third-layer repeater 36. . Also in this case, the repeater 36 suspends the transfer, and the first term becomes “2” according to (6-3-1). Therefore, the repeater 36 transfers the frame in the period T7 after the transfer time corresponding to two frames from the period T5. Forward.
[0053]
The frame transferred in the period T5 is received by the repeaters 31 to 33, 35 to 37, but is discarded by the repeaters 31 to 33, 35, and 36. Will be received. In this case, since all the relays in the second layer have transmitted the frame, the frames received by the relays in the third layer are transferred according to their priorities. Since the first term is “2” due to (7-4-1), the repeater 37 transfers the frame in a period T8 after a transfer time equivalent to two frames from the period T6.
[0054]
The frames transferred in the period T6 are received by the repeaters 32, 34, and 37, but are all discarded.
[0055]
The frame transferred in the period T7 is received by the repeaters 33, 34 and 37 and the receiver 21, but is discarded by the repeaters 33, 34 and 37 and is substantially received by the receiver 21. .
[0056]
The frames transferred in the period T8 are received by the repeaters 34 to 36 and the receiver 21, but are all discarded.
[0057]
As described above, data is unidirectionally transferred from the transmitter 11 to the receiver 21 via the repeater.
[0058]
The above description of the operation is for the transmitter 11, but in the case of the transmitter 12, data is transferred in one direction from the transmitter 12 to the receiver 21 via the repeater. Will be.
[0059]
That is, the frame transmitted from the transmitter 12 in the first period is received by the first-layer repeater 35, and is immediately transferred in the second period.
[0060]
Since the frames transferred in the second period are received by the repeaters 32, 34, and 37 in the second hierarchy, they are immediately transferred by the repeater 32 in the third period, and are transferred after the transfer time equivalent to one frame. The data is transferred by the repeater 34 in four periods, and transferred by the repeater 37 in a fifth period after a transfer time equivalent to two frames.
[0061]
The frame transferred in the third period is received by the repeaters 31 and 34, but is discarded by the repeater 34, so that the frame is substantially received by the third-layer repeater 31.
[0062]
The frame transferred in the fourth period is received by the repeaters 31 to 33, 35 to 37, but is discarded by the repeaters 31, 32, 35, and 37. , 36.
[0063]
The frame transferred in the fifth period is received by the repeaters 34 to 36 and the receiver 21, but is discarded by the repeaters 34 to 36, so that the frame is substantially received by the receiver 21. Thereafter, the same relay processing is performed.
[0064]
As described above, according to the first embodiment, in the case of unidirectional transmission, when transmitting a frame from a transmitter to a receiver, relaying can be performed without lengthening the time depending on the position of the transmitter. .
[0065]
(2nd Embodiment)
FIG. 3 is a diagram illustrating the operation of the wireless communication system according to the second embodiment of the present invention.
[0066]
The wireless communication system according to the second embodiment includes a transmitter 11 (12) and a receiver 21 similarly to the wireless communication system according to the first embodiment, and is different from the wireless communication system according to the first embodiment. Each repeater is provided.
[0067]
Instead of the first feature of the first embodiment, each repeater of the second embodiment, when relaying a frame from a transmitter, relays a base point that minimizes the minimum number of relays of the frame from the transmitter. Based on the repeater number of the transmitter and the intercommunication relation table, the layer is divided into layers determined by the number of relays from the transmitter. In a plurality of relay routes that are formed from the base repeater through one repeater for each hierarchy and pass through each hierarchy to the hierarchy having the largest number of relays, one relay route and another relay route are mutually connected. A first feature is that priorities are assigned based on the repeater numbers between the layers so as to have a higher-order relationship.
[0068]
Here, since the configuration of the example of FIG. 1 also satisfies the first feature of the second embodiment, a more specific description will be given by also using FIG. In the case of the transmitter 11, a plurality of relay routes are formed from the base repeater 31 so as to pass through each layer. Among the plurality of relay routes, a first relay route is formed by the repeaters 32 and 25. , The second relay path is formed by the repeaters 34 and 37, and the third relay path is formed by the repeaters 33 and 36. Then, it is assumed that the priorities “1” to “7” are assigned to the repeaters 31, 32, 35, 34, 37, 36, and 33, respectively. Not limited to this, the priorities “1” to “7” may be assigned to the repeaters 31, 32, 35, 33, 36, 34, 34 based on the repeater numbers of the repeaters on the upper side of each relay route. 37 may be assigned.
[0069]
On the other hand, in the case of the transmitter 12, it is assumed that the priorities “1” to “7” are assigned to the repeaters 35, 32, 31, 34, 33, 36, and 37, respectively. Not limited to this, the priorities “1” to “7” may be assigned to the repeaters 35, 32, 31, 34, 33, 37, 37 based on the repeater numbers of the repeaters on the upper side of each relay route. 36 may be assigned.
[0070]
In the wireless communication system having the above configuration, as shown in FIG. 3, the frame transmitted from the transmitter 11 in the period T1 is received by the first-layer repeater 31, and is immediately transferred in the period T2. Here, the transfer timing of the frame by the repeater 31 is immediate in the period T2 since the first term of the above equation is "0" by (1-0-1).
[0071]
The frame transferred in the period T2 is received by the repeaters 32 to 34 of the second hierarchy, is immediately transferred by the repeater 32 in the period T3, and is transferred by the repeater 34 in the period T5 after a transfer time equivalent to two frames. The transfer is performed by the repeater 33 in a period T8 after a transfer time equivalent to five frames. Here, the transfer timing by the repeater 32 is immediate because the first term is “0” by (2-1-1). Since the first term is “2” due to (4-1-1), the transfer timing by the repeater 34 is a period T5 after a transfer time equivalent to two frames from the period T3. The transfer timing by the repeater 33 is the period T8 after the transfer time corresponding to five frames from the period T3 since the first term is “5” according to (7-1-1).
[0072]
The frame transferred in the period T3 is received by the repeaters 31, 34, and 35, but is discarded by the repeaters 31, 34, so that the frame is substantially received by the third-layer repeater 35. . In this case, the repeater 35 immediately transfers the frame in the period T4 because the first term becomes “0” according to (3-2-1).
[0073]
The frame transferred in the period T4 is received by the repeaters 32, 34, and 37, but is discarded by the repeaters 32 and 34, so that it is substantially received by the third-layer repeater 37. . In this case, since the first term becomes “1” according to (5-3-1), the relay device 37 transfers the frame during a period T6 after a transfer time corresponding to one frame from the period T5.
[0074]
The frame transferred in the period T5 is received by the repeaters 31 to 33, 35 to 37, but is discarded by the repeaters 31 to 33, 35, 37. Will be received. In this case, since the first term becomes “1” due to (6-4-1), the repeater 36 transfers the frame during a period T7 which is a transfer time equivalent to one frame from the period T6.
[0075]
The frame transferred in the period T6 is received by the repeaters 34 to 36 and the receiver 21, but is discarded by the repeaters 34 to 36, so that the frame is substantially received by the receiver 21.
[0076]
The frames transferred in the period T7 are received by the repeaters 33, 34, 37 and the receiver 21, but are all discarded.
[0077]
The frames transferred in the period T8 are received by the repeaters 31, 34, and 36, but are all discarded.
[0078]
As described above, data is unidirectionally transferred from the transmitter 11 to the receiver 21 via the repeater. Similarly, in the case of the transmitter 12, data is unidirectionally transferred from the transmitter 12 to the receiver 21 via the repeater.
[0079]
That is, the frame transmitted from the transmitter 12 in the first period is received by the first-layer repeater 35, and is immediately transferred in the second period.
[0080]
The frame transferred in the second period is received by the repeaters 32, 34, and 37 in the second hierarchy, immediately transferred by the repeater 32 in the third period, and is transferred in the fifth period after a transfer time equivalent to two frames. , And transferred by the repeater 37 in an eighth period after a transfer time equivalent to five frames.
[0081]
The frame transferred in the third period is received by the repeaters 31, 34 and 35, but is discarded by the repeaters 34 and 35, so that the frame is substantially received by the third-layer repeater 31. Become. In this case, the repeater 31 transfers the frame immediately in the fourth period because the first term becomes “0” according to (3-2-1).
[0082]
The frame transferred in the fourth period is received by the repeaters 32 to 34, but is discarded by the repeaters 32 and 34, so that the frame is substantially received by the third-layer repeater 33. In this case, since the first term becomes “1” according to (5-3-1), the repeater 33 transfers the frame in the sixth period after a transfer time corresponding to one frame from the fifth period.
[0083]
The frame transferred in the fifth period is received by the repeaters 31 to 33, 35 to 37, but is discarded by the repeaters 31 to 33, 35, 37. Will be received. In this case, since the first term becomes “1” according to (6-4-1), the repeater 36 transfers the frame in the seventh period after a transfer time corresponding to one frame from the sixth period.
[0084]
The frames transferred in the sixth period are received by the repeaters 31, 34 and 36, but are all discarded.
[0085]
The frame transferred in the seventh period is received by the repeaters 33, 34, 37 and the receiver 21, but is discarded by the repeaters 33, 34, 37, and thus is substantially received by the receiver 21. Will be.
[0086]
The frames transferred in the eighth period are received by the repeaters 34, 35, 36 and the receiver 21, but are all discarded.
[0087]
As described above, also in the second embodiment, in the case of one-way transmission, when transmitting a frame from a transmitter to a receiver, relaying can be performed without increasing the time depending on the position of the transmitter.
[0088]
(Third embodiment)
FIG. 4 is a configuration diagram of a frame used in the wireless communication system of the third embodiment according to the present invention.
[0089]
The wireless communication system according to the third embodiment differs from the wireless communication system according to the first or second embodiment in that a frame having the configuration shown in FIG. 4 is used instead of the frame having the configuration shown in FIG. Features.
[0090]
That is, each relay of the third embodiment, when receiving a frame from the transmitter first, indicates information from the transmitter, indicating that the relay has received the frame from the transmitter first. The first feature is that the data is transferred to another repeater together with the base point information. Specifically, the information in the frame from the transmitter similar to the first or second embodiment is transferred as the frame of the third embodiment together with the first repeater number as the base point information shown in FIG. is there.
[0091]
In addition, when each of the repeaters of the third embodiment receives the information from the transmitter together with the base point information, the repeater obtains the minimum number of relays from the transmitter based on the base point information and the intercommunicable relation table. While self is divided into layers determined by the minimum number of relays, priority is assigned to itself in the same manner as in the first or second embodiment, and when information from a transmitter is transferred, the information is transferred together with the base point information. .
[0092]
Here, as described above, the transmitter initializes the repeater number in the frame to “0”, but also initializes the first repeater number to “0”. Then, only the repeater that has received the frame from the transmitter first rewrites the first repeater number initially set to “0” in the frame with the repeater number stored in its own storage means. The rewriting of the first repeater number is prohibited for other repeaters. Also, each repeater stores the first repeater number together with the identification code and the frame number in the received frame, and uses the identification code and the frame number to discard the received frame as in the related art. The first repeater number is used when determining the minimum number of relays from the transmitter as a feature of the third embodiment. Others are as described in the first or second embodiment.
[0093]
(Fourth embodiment)
FIG. 5 is a configuration diagram of a frame used in the wireless communication system according to the fourth embodiment of the present invention.
[0094]
The wireless communication system according to the fourth embodiment differs from the wireless communication system according to the first or second embodiment in that a frame having the configuration shown in FIG. 5 is used instead of the frame having the configuration shown in FIG. Features.
[0095]
That is, in the fourth embodiment, the transmitter is configured to transmit data together with the preamble, the unique word, the identification code, the frame number, and the number of repeaters initialized to, for example, “0”. .
[0096]
When a repeater receives a frame from a transmitter for the first time, each repeater transmits its own repeater number and intercommunication relationship table as a base repeater with the minimum number of relays of a frame from the transmitter. On the basis of this, the minimum number of relays is obtained for each repeater, and each of the repeaters is classified into each layer determined by the minimum number of relays, while the priority is given to each repeater in the same manner as in the first or second embodiment. The information in the frame from the allocation and the transmitter is transferred to each of the other repeaters together with the repeater number of each repeater and the priority order respectively associated with these repeater numbers. More specifically, the repeater that first receives the frame from the transmitter rewrites the repeater number in the frame with its own repeater number, increments the number of repeaters in the frame by “1”, Then, the same frame is updated by adding the first to n-th repeater numbers storing the repeater numbers of the repeaters in the order of the priority order, and the updated frame is transferred. That is, the repeater number of the repeater having the priority "1" is stored in the first repeater number, and the repeater number of the repeater having the priority "2" is stored in the second repeater number. The repeater numbers of the repeaters whose priority is “3” or later are stored after the third repeater number.
[0097]
Also, when each relay of the fourth embodiment receives information from the transmitter together with each relay number and each priority, when transferring a frame from the transmitter, each relay transmits the information to each relay. Forward with number and each priority. More specifically, the frame from the transmitter is updated by rewriting the repeater number in the frame from the transmitter to its own repeater number and incrementing the number of repeaters in the frame by “1”. , The updated frame is transferred.
[0098]
Next, the operation of the wireless communication system having the above configuration will be described with reference to FIGS.
[0099]
For example, in the case of the transmitter 11, the transmitter 11 transmits data to be transmitted in the period T1, together with a preamble, a unique word, an identification code, a frame number, and the number of repeaters initially set to “0”. Transmit as a frame.
[0100]
The frame transmitted in the period T1 is received by the repeater 31. Since the number of repeaters in the same frame is “0”, the repeater 31 calculates the minimum number of relays for each relay, divides each repeater into a hierarchy determined by the minimum number of relays, and Priority is assigned to each repeater based on the repeater number. In this case, as in the first embodiment, the repeater 31 is divided into a first hierarchy, the repeaters 32-34 are divided into a second hierarchy, and the repeaters 35-37 are divided into a third hierarchy. Then, the priorities are assigned to the respective repeaters such that the repeater 31, the repeater 32, the repeater 33, the repeater 34, the repeater 35, the repeater 36, and the repeater 37 become lower in this order.
[0101]
Thereafter, the repeater 31 rewrites the repeater number in the frame from the transmitter 11 to its own repeater number, increments the number of repeaters in the frame by “1”, and repeats in the order of the priority. By adding the first to n-th repeater numbers storing the repeater numbers of the repeaters, the same frame is updated, and the updated frame is immediately transferred in the period T2. In this case, the n-th repeater number becomes the seventh repeater number, and the repeater numbers of the repeaters 31 to 37 are stored in the first to seventh repeater numbers, respectively.
[0102]
The frame transmitted in the period T2 is received by the repeaters 32-34. The repeater 32 searches for a second repeater number including its own repeater number among the first to seventh repeater numbers in the same frame, and is assigned a second priority to itself. Is detected, and the first term becomes “0” according to (2-1-1), so that the same frame is immediately transferred in the updated frame in the period T3.
[0103]
The repeater 33 searches for a third repeater number including its own repeater number among the first to seventh repeater numbers in the same frame, and is assigned a third priority to itself. Since the first term is set to “1” by (3-1-1), the same frame is transferred in a period T4 after a transfer time corresponding to one frame from the period T2.
[0104]
The repeater 34 searches for a fourth repeater number including its own repeater number among the first to seventh repeater numbers in the same frame, and is assigned a fourth priority to itself. Is detected, and the first term is set to “2” by (4-1-1). Therefore, the same frame is transferred in a period T5 after a transfer time corresponding to two frames from the period T2.
[0105]
The frame transmitted in the period T3 is received by the repeaters 31, 34 and 35, but is discarded by the repeaters 31 and 34, so that the frame is substantially received by the third-layer repeater 35. . In this case, since the first term is “2” according to (5-2-1), the repeater 35 transfers the frame in a period T6 after a transfer time corresponding to two frames from the period T4.
[0106]
Thereafter, the same operation is performed, and data is transferred in one direction from the transmitter 11 to the receiver 21 via the repeater, as in the first embodiment.
[0107]
(Fifth embodiment)
6 to 8 are explanatory diagrams of an operation for creating an intercommunication relation table in the wireless communication system according to the fifth embodiment of the present invention, and FIGS. 9 to 11 are configuration diagrams of frames used in the creating operation.
[0108]
The wireless communication system according to the fifth embodiment is different from the wireless communication system according to any of the first to fourth embodiments in that each repeater performs broadcast communication at the time of installation, thereby establishing an intercommunicable relationship. It is characterized in that an intercommunicable relation table is created and stored while exchanging information.
[0109]
Next, an operation that is a feature of the fifth embodiment will be described with reference to FIG. When the repeater 31 is installed and turned on, the repeater 31 transmits a broadcast frame shown in FIG. 9 according to a predetermined communication sequence in order to obtain information on a mutual communicable relationship, as shown in FIG. Broadcast. In this case, the timeout occurs because no other repeater is installed yet, and the repeater 31 creates and stores the next intercommunicatable relationship table (Table 2).
[0110]
[Table 2]

[0111]
Thereafter, when the repeater 32 is installed and the power is turned on, the repeater 32 performs broadcast communication in accordance with a predetermined communication sequence in order to obtain information on a mutual communicable relationship, as shown in FIG. In this case, since the repeater 31 responds, the following intercommunicatable relation table (Table 3) is created and stored by the repeaters 31 and 32.
[0112]
[Table 3]

[0113]
Here, in FIG. 7, the repeater 32 transmits a broadcast frame after the power is turned on. The repeater 31 that has received the link request changes the destination repeater number to the repeater number of the repeater 32 (designates the repeater 32) by the destination designation frame of FIG. 10 after the waiting time determined by the random number. Send a frame. The repeater 32 that has received this transmits a link response frame in which the repeater 31 is designated by the destination designation frame. The repeater 31 that has received this transfers the intercommunication relation table of (Table 2) to the repeater 32. Receiving this, the repeater 32 adds a mutual communicable relationship between its own station and the repeater 31 to create a mutual communicable relationship table (Table 3), and stores and stores this table. Thereafter, since there is no other repeater, a timeout occurs, and the repeater 32 transmits the intercommunicatable relationship table of (Table 3) to the repeater 31. The transponder 31 stores and holds the intercommunicatable relationship table of (Table 3) instead of the intercommunicatable relationship table of (Table 2).
[0114]
Thereafter, when the repeater 33 is installed and the power is turned on, the repeater 33 performs broadcast communication in accordance with a predetermined communication sequence in order to obtain information on a mutual communicable relationship, as shown in FIG. In this case, the following mutual communication possible table (Table 4) is created and stored and held by the repeaters 31 to 33.
[0115]
[Table 4]

[0116]
Here, in FIG. 8, the repeater 33 transmits a broadcast frame after the power is turned on. Upon receiving this, the repeater 31 transmits a link request frame designating the repeater 33 by the destination designation frame after a waiting time determined by the random number. Upon receiving this, the relay device 33 transmits a link response frame specifying the relay device 31 by the destination specifying frame. The relay 31 that has received this transmits the intercommunication relation table of (Table 3) to the relay 33. Receiving this, the repeater 33 adds the mutual communicable relationship between the local station and the repeater 31 to create the mutual communicable relationship table of (Table 4), and stores and stores this table. Thereafter, since there is no other repeater capable of (direct) mutual communication, a timeout occurs, and the relay 33 transmits the mutual communication possible relationship table of (Table 4) to the relay 31. Upon receiving the table, the repeater 31 stores and retains the table in place of the mutual communication possible relation table shown in (Table 3).
[0117]
Thereafter, the repeater 33 searches the intercommunicable relation table of (Table 4) for a repeater that cannot communicate with each other, and finds the repeater 32. Therefore, the repeater 33 uses the relay path designation frame of FIG. By designating the repeater 32 by the number and specifying the repeaters up to the repeater 32 by the number of repeaters and the first to n-th repeater numbers, the repeaters can be relayed via the repeater 31 which can communicate with each other. The intercommunication relation table of (Table 4) is transmitted to the device 32. In this case, “1” is stored in the number of repeaters, the n-th repeater number becomes the first repeater number, and the repeater number of the repeater 31 is stored in this.
[0118]
The repeater 31 that has received the intercommunication relation table of (Table 4) looks at the number of repeaters and the first to n-th repeater numbers, transfers the same frame to the repeater 32, and uses the same frame as shown in (Table 4). The transponder 32 that has received the intercommunication relation table described in (1) stores and retains the table.
[0119]
If the repeaters 34 to 37 are sequentially installed in this manner, each repeater stores and holds the mutual communicable relationship table of (Table 1).
[0120]
(Sixth embodiment)
The wireless communication system of the sixth embodiment according to the present invention is characterized in that each repeater constantly updates an intercommunication relationship table as a difference from any of the wireless communication systems of the first to fifth embodiments. And
[0121]
For example, in FIG. 3, after the relay 32 transfers the frame in the period T3, the relay 32 receives the frame in the period T5 from the relay 34 having a lower priority than the self and having an intercommunicable relationship with the same hierarchy as the own. If not, the repeater 32 increments the unreceivable count for the repeater 34 by “1”. If the unreceivable count value is equal to or greater than a predetermined value, the repeater 32 resets the unreceivable count, and By correcting the communicable relationship from “OK” to “Unable”, the own communicable relationship table is updated. Thereafter, the repeater 32 transmits the updated intercommunication relation table in a broadcast frame. As a result, each repeater that has received the broadcast frame stores and holds the updated intercommunication relation table in place of its own intercommunication relation table.
[0122]
Thereafter, after the relay 32 transmits the frame in the period T3, if the relay 32 receives a frame in the period T5 from the relay 34 having a lower priority than the self and having an intercommunicable relationship with the same hierarchy as the own, The receiver 32 increments the receive enable count for the repeater 34 by "1", and resets the receive enable count if the receive enable count value is equal to or greater than a predetermined value, thereby disabling the mutual communicable relationship between the repeaters 32 and 34. The table is updated to "OK" to update its own mutual communication possible relation table. Thereafter, the repeater 32 transmits the updated intercommunication relation table in a broadcast frame. As a result, each repeater that has received the broadcast frame stores and holds the updated intercommunication relation table in place of its own intercommunication relation table.
[0123]
As described above, if each repeater constantly updates the intercommunication relation table, data can be transmitted from the transmitter to the receiver by an appropriate transmission path.
[0124]
【The invention's effect】
As is apparent from the above, according to the first and second aspects of the present invention, in the case of unidirectional transmission, when information is transmitted from the transmitter to the receiver, the time is lengthened depending on the position of the transmitter. And can be relayed.
[0125]
According to the third and fourth aspects of the present invention, each repeater can be automatically divided into each layer and a priority can be assigned to each repeater.
[0126]
According to the fifth and sixth aspects of the present invention, it is possible to automatically store and hold information indicating the mutual communicable relationship in each repeater.
[0127]
According to the seventh aspect of the present invention, by using the wireless repeater of the present invention, when transmitting information from the transmitter to the receiver in the case of one-way transmission, the time is extended depending on the position of the transmitter. It is possible to relay without the need.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a wireless communication system according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of an operation of the wireless communication system.
FIG. 3 is an explanatory diagram illustrating an operation of a wireless communication system according to a second embodiment of the present invention.
FIG. 4 is a configuration diagram of a frame used in a wireless communication system according to a third embodiment of the present invention.
FIG. 5 is a configuration diagram of a frame used in a wireless communication system according to a fourth embodiment of the present invention.
FIG. 6 is an explanatory diagram of an operation of creating a mutual communicable relation table in a wireless communication system according to a fifth embodiment of the present invention.
FIG. 7 is an explanatory diagram of an operation of creating the mutual communication possible relation table.
FIG. 8 is an explanatory diagram of an operation of creating the mutual communication possible relation table.
FIG. 9 is a configuration diagram of a frame used in the creation operation.
FIG. 10 is a configuration diagram of a frame used in the creation operation.
FIG. 11 is a configuration diagram of a frame used in the creation operation.
FIG. 12 is a configuration diagram of a conventional one-way transmission wireless communication system.
FIG. 13 is a configuration diagram of a frame used in the wireless communication system.
FIG. 14 is an explanatory diagram of the operation of the wireless communication system.
FIG. 15 is an explanatory diagram of a problem of the wireless communication system.
FIG. 16 is an explanatory diagram of a problem of the wireless communication system.
[Explanation of symbols]
11,12 transmitter
21 Receiver
31-37 repeater

Claims (7)

A wireless communication system including a transmitter for wireless transmission and a receiver for wireless reception, and including a plurality of relays for wireless transmission and reception for transferring information transmitted from the transmitter to the receiver,
Each of the plurality of repeaters,
Storage means for storing unique repeater identification information and information indicating a direct mutual communicable relationship between the repeaters,
When relaying information from the transmitter, based on the repeater identification information of the base repeater and the information indicating the mutual communicable relationship, the number of relays of information from the transmitter is minimized, the transmitter While being divided into layers determined by the number of relays from, on the basis of repeater identification information in the same layer, priority is assigned between layers, so that the higher the layer on the transmitter side is higher,
All the repeaters in another layer adjacent to the transmitter side with respect to the own layer transfer information from the transmitter according to the priority in the own layer after transferring information from the transmitter. A wireless communication system, comprising: A wireless communication system including a transmitter for wireless transmission and a receiver for wireless reception, and including a plurality of relays for wireless transmission and reception for transferring information transmitted from the transmitter to the receiver,
Each of the plurality of repeaters,
Storage means for storing unique repeater identification information and information indicating a direct mutual communicable relationship between the repeaters,
When relaying information from the transmitter, based on the repeater identification information of the base repeater and the information indicating the mutual communicable relationship, the number of relays of information from the transmitter is minimized, the transmitter From the layer adjacent to the layer having the lowest number of relays, including the repeater at the base point, to the layer having the highest number of relays. In a plurality of relay paths formed through one repeater and passing through each layer, repeater identification information is provided between layers so that one relay path and another relay path have a higher-order and lower-order relationship with each other. Is assigned a priority based on
A wireless communication system for transferring information from the transmitter according to a priority order in a relay route of the wireless communication system. Each of the plurality of repeaters,
If the information from the transmitter is received first, the information from the transmitter is transferred to each of the other repeaters together with base information indicating that the repeater is the base repeater. ,
When the information from the transmitter is received together with the base point information, the number of relays from the transmitter is determined based on the base point information and the information indicating the intercommunicable relationship, and the layer determined by the number of relays The wireless communication system according to claim 1 or 2, wherein, while dividing the self, the priority is assigned to the self, and when transferring information from the transmitter, the information is transferred together with the base point information. Each of the plurality of repeaters,
If the information from the transmitter is received first, based on the own repeater identification information and the information indicating the mutual communicable relationship that is the base repeater, relaying is performed for each of the plurality of repeaters. Determine the number of times, while dividing the plurality of repeaters into each layer determined by the number of relays, while assigning the priority to each of the plurality of repeaters, information from the transmitter, the plurality of relays Transfer to each other repeater with the repeater identification information of the device and a plurality of priorities respectively associated with these repeater identification information,
If information from the transmitter is received with the plurality of repeater identification information and the plurality of priorities, when transferring information from the transmitter, the information is transmitted to the plurality of repeater identification information and The wireless communication system according to claim 1, wherein the transmission is performed with the plurality of priorities. Each of the plurality of repeaters, by performing broadcast communication, while exchanging information on the mutual communicable relationship, creates information indicating the mutual communicable relationship, and stores the information in the storage unit. The wireless communication system according to any one of claims 1 to 4, wherein: Each of the plurality of repeaters,
From other repeaters that have a direct intercommunication possible relationship with the self obtained from the information indicating the intercommunication possible relationship, if information from the transmitter to be received is not received, the relay Update the information indicating the mutual communication possible relationship by disabling the mutual communication possible relationship between the device and the self,
When information from the transmitter is received from another repeater, the information indicating the mutual communicable relationship is updated by allowing the mutual communicable relationship between itself and the repeater. The wireless communication system according to any one of claims 1 to 4, wherein: A wireless repeater as the repeater in the wireless communication system according to claim 1.

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