JP4207278B2

JP4207278B2 - Communication method and communication system

Info

Publication number: JP4207278B2
Application number: JP00764999A
Authority: JP
Inventors: 康男吉村; 聡伊藤
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1999-01-14
Filing date: 1999-01-14
Publication date: 2009-01-14
Anticipated expiration: 2019-01-14
Also published as: JP2000209299A

Description

【０００１】
【発明の属する技術分野】
本発明は、送信装置と受信装置とで通信を行うときに識別符号を用いて通信相手を確認しデータ信号の送受信を行うもので識別符号を含む接続信号を送信装置から繰り返し送信する通信方法に関し、通信相手でない受信装置で識別符号が異なることを判断するまでの時間を短くするものである。
【０００２】
例えば、間欠受信待ち受け時に識別符号が異なることを判断するまでの時間を短くして受信装置の電池寿命を延ばしたり、複数の通信チャネルから一つの通信チャネルを利用して通信するときに識別符号が異なることを判断するまでの時間を短くして受信装置での通信チャネル切換えの周期を短くするものである。
【０００３】
【従来の技術】
送信装置と受信装置とで通信を行うときに識別符号を用いて通信相手を判断しデータ信号の送受信を行うもので識別符号を含む接続信号を送信装置から繰り返し送信する通信方法に関し従来例として特開平１０−１９８８８１号公報を説明する。
【０００４】
図７に通信電文フォーマットを示す。通信電文は大きく分けて次の３つから構成される。
【０００５】
１つめは標準規格で定められ必ず送信しなければならない部分で、図７中のビット同期信号５１、フレーム同期信号５２、無線機呼出名称５３がこれにあたる（但し、本発明では関係しない）。
【０００６】
２つめは本発明でいうところの接続信号の繰り返し送信部であり識別符号を含む。図７中のシステム起動信号５４がこれにあたり短縮型・呼出名称５７が本発明でいうところの部分識別符号である。この短縮型・呼出名称の他に短いビット同期信号５５とシステム識別符号５６とを合わせた１単位が接続信号にあたる。
【０００７】
３つめは本発明でいうところのデータ信号であり、図７中の相手局・限定情報（この中に相手局・無線呼出名称が含まれ短縮型・呼出名称はこの一部分である）５８、制御情報（データ）５９がこれにあたる。
【０００８】
この特開平１０−１９８８８１号公報では識別符号が１２桁でそのうちの下４桁を部分識別符号として接続信号に含め送信する。これにより識別符号が長いときに発生する以下の不都合を解決するものである。識別符号が長いと接続信号１回の送信時間が長くなり、通信相手でない受信装置で識別符号が異なることを判断するまでの時間が長くなる。また接続信号の繰り返し送信時間は受信装置が受信するのに必要な時間（この図では間欠キャリアセンス間隔）程度にして送信時間を短くすることが望ましいが、識別符号が長いと接続信号１回の送信時間が長くなり間欠キャリアセンス間隔よりも長くなることが発生しうる。
【０００９】
これらに対して接続信号に部分識別符号を用いることで識別符号が長くても受信すべきかどうかの判断時間を短縮し、接続信号の送信時間を必要以上に長くさせないことが可能である。
【００１０】
【発明が解決しようとする課題】
以上のように、送信装置は通信相手を識別する識別符号の一部分を抽出した部分識別符号を含む接続信号を受信装置が受信するのに必要な時間以上連続して繰り返し送出したのちにデータ信号を送信し、一方、受信装置は、送信装置からの接続信号を受信し、接続信号内の部分識別符号が受信装置が備える識別符号の一部分であることを確認したときにデータ信号の受信処理を行う。
【００１１】
特開平１０−１９８８８１号公報の例で言えば、接続信号内の部分識別符号でまず下４桁の確認を行い、部分識別符号が一致した場合は引き続きデータ信号内の識別符号で残りの上位８桁の確認を行って通信相手を判断する。
【００１２】
接続信号に部分識別符号を用いることで識別符号が長くても受信すべきかどうかの判断時間を短縮し、接続信号の送信時間を必要以上に長くさせないことが可能である。しかしながら、ある条件で部分識別符号の効果が発揮できないことがある。
【００１３】
識別符号の下４桁がたまたま自身の識別符号（受信装置が備える識別符号）と同じで残りの上位８桁が異なる受信装置が存在した場合を図８で説明する。この確率は、各受信装置の通信エリア内に識別符号の異なる受信装置が１００台とすると１／１００である。
【００１４】
送信装置から出力される通信電文フォーマット（１）には部分識別符号は（２）のように下位４桁が繰り返される。これを受信する受信装置は、これが自身の識別符号であれば（３）のようにデータ信号の最後まで受信し、自身のものと似た識別符号である場合には（４）のようにデータ信号の途中まで受信し識別符号１２桁を比較したところで受信中断する。すなわち、自身の識別符号に似た識別符号を持つ受信装置が存在すると受信装置は接続信号を受信した時点ではこの二つを識別できずデータ信号の途中まで受信することになる。これは接続信号の繰り返し送信時間が長いほど次のような課題が顕著になる。
【００１５】
特開平１０−１９８８８１号公報のように間欠受信待ち受けを行う場合、受信した信号が自身宛て通信でなければ受信を中断して受信回路の消費電流を抑えるよう動作する。通常、電池寿命をのばすため間欠キャリアセンスの時間間隔を長くし接続信号の繰り返し送信時間を長くする。したがって、自身の識別符号に似た識別符号が存在すると受信装置は接続信号の途中で受信中断することができず送信時間の長い接続信号を最後まで受信することになり電池寿命が縮む。
【００１６】
また多チャネル受信待ち受けを行う送信装置・受信装置で課題が生じる。多チャネル受信待ち受けとは、受信装置は複数ある通信チャネル（Ｎ個）を順次切換えて接続信号を探索して受信待ち受けを行い、接続信号内の識別符号と自身の識別符号とが一致しないときに受信を中断し通信チャネルを切換えて接続信号の探索を行うものである。送信装置から送信する通信電文フォーマットは図８と同じで、複数ある通信チャネル（Ｎ個）の中から１つの通信チャネルを選択し接続信号をＮ回以上繰り返し送出してからデータ信号を送信する。
【００１７】
このとき、自身の識別符号に似た識別符号が存在すると受信装置は接続信号の途中で受信中断することができず送信時間の長い接続信号を最後まで受信する。その結果、通信チャネルを切換えて別の接続信号の探索を行うことが遅れる。このあいだに通信すべき相手からの送信信号があればそれを受信することはできない。
【００１８】
本発明の目的は、自身の識別符号に似た識別符号が存在しても部分識別符号の効果を発揮させることである。
【００１９】
【課題を解決するための手段】
本発明は上記課題を解決するために、送信装置と受信装置とで通信を行うときに、送信装置は、通信相手を識別する識別符号の一部分を抽出した部分識別符号を含む接続信号を受信装置が受信するのに必要な時間以上連続して繰り返し送出したのちに識別符号を含むデータ信号を送信し、受信装置は、送信装置からの接続信号を受信し接続信号内の部分識別符号と受信装置の備える識別符号の一部分とが一致することを確認したときにデータ信号の受信処理を行い、送信装置は、接続信号を繰り返す毎に部分識別符号の抽出部分を変更するものである。そして、送信装置は接続信号中にその接続信号の送信回数値と部分識別符号とを含めて送信し、受信装置は接続信号内の送信回数値を用いて部分識別符号と受信装置の備える識別符号の一部分とが一致することを確認するものである。
【００２０】
上記発明によれば、接続信号を繰り返す毎に部分識別符号の抽出部分が変わるので、自身の識別符号に似た識別符号が存在しても受信装置は接続信号を繰り返し受信する途中で識別でき受信を中断することができる。そして、受信装置は送信回数値によって部分識別符号の抽出位置がわかるので接続信号の途中から受信しても確実に識別符号を比較することができる。
【００２１】
【発明の実施の形態】
本発明は各請求項記載の形態で実施することができるものである。
【００２２】
すなわち、請求項１記載の発明のように、送信装置は接続信号を繰り返す毎に部分識別符号の抽出部分を変更するものである。そして、接続信号を繰り返す毎に部分識別符号の抽出部分が変わるので、自身の識別符号に似た識別符号が存在しても受信装置は接続信号を繰り返し受信する途中で識別でき受信を中断することができる。
【００２４】
そして、送信装置は接続信号中にその接続信号の送信回数値と部分識別符号とを含めて送信し、受信装置は接続信号内の送信回数値を利用して部分識別符号と受信装置の備える識別符号の一部分とが一致することを確認するものである。そして、受信装置は送信回数値によって部分識別符号の抽出位置がわかるので接続信号の途中から受信しても確実に識別符号を比較することができる。
【００２５】
また、請求項２記載の発明のように、送信装置は接続信号に部分識別符号の抽出位置を示す位置特定符号を併せて送信し、受信装置は接続信号内の位置特定符号を利用して部分識別符号と受信装置の備える識別符号の一部分とが一致することを確認するものである。そして、受信装置は位置特定符号によって部分識別符号の抽出位置がわかるので送信装置が抽出位置を自在に変更しても受信装置は確実に識別符号を比較することができる。
【００２６】
そして、請求項３記載の発明のように、送信装置は接続信号を繰り返し送信しながら部分識別符号の抽出部分を変更するときに接続信号を最初から最後まで受信すると識別符号全体を少なくとも含むように抽出するものである。そして、繰り返し送信する接続信号を受信する途中で識別符号全体がわかるので、自身の識別符号に似た識別符号が存在しても受信装置は接続信号を繰り返し受信する途中で確実に識別でき受信を中断することができる。
【００２８】
また、請求項４記載の発明のように、送信装置は接続信号を繰り返し送信しながら部分識別符号の抽出部分をランダムに変更するものである。そして、部分識別符号の抽出部分をランダムに変更するので受信装置は接続信号を受信する途中で特定の識別符号の受信中断が常に遅れるということをなくすことができる。
【００３１】
【実施例】
以下、本発明の実施例について図面を用いて説明する。
【００３２】
（実施例1）
図１に本発明の実施例１に関わる無線送受信装置の構成を示すブロック図である。相手の無線送受信装置と通信するため、アンテナ１を介して相手の無線送受信装置からの無線信号２を受信し接続信号やデータ信号など受信電文に復調する受信手段３、その受信手段３の電源オン・オフや受信周波数などを制御する受信回路制御手段４、送信電文を変調してアンテナ１を介して相手の無線送受信装置に無線信号２を送信する送信手段５、その送信手段５の電源オン・オフや送信周波数などを制御する送信回路制御手段６、受信手段３からの受信電文を解読して受信処理するとともに送信手段５に送信電文を渡すなど通信全体を制御する例えばマイコンからなる通信制御手段７から構成される。
【００３３】
また、通信相手を識別するために各無線送受信装置にユニークな識別符号を用い、初期設定時にその無線送受信装置自身の識別符号と通信相手の識別符号とを識別符号記憶手段８に記憶する。この識別符号記憶手段８から識別符号を読み出し、送信時は送信電文中に受信者を識別する符号として通信相手の識別符号を挿入する。受信時は受信電文中の受信者識別符号が自身の識別符号と一致している電文のみを解読する。必要に応じて、さらに送信電文中に送信者を識別する符号として自身の識別符号を挿入し、受信者は受信電文中の送信者識別符号が自身の識別符号と一致していることを確認してもよい。
【００３４】
図１において、識別符号抽出手段９が送信電文中に挿入する通信相手の識別符号を抽出し、識別符号比較手段１０が受信電文中の受信者識別符号と自身の識別符号とを比較して挿入されていることを確認する。
【００３５】
図１の無線送受信装置間で通信される電文フォーマットを図２に示す。通信電文は大きく分けて次の２つから構成される。
【００３６】
１つめは接続信号の繰り返し送信部であり、１つの接続信号はビット同期信号２０、フレーム同期信号２１、制御コード２２と部分識別符号２３とからなる。受信者はビット同期信号２０を受信して送信者との同期を取り、フレーム同期信号２１を受信して制御コード２２の先頭を知る。制御コード２２には接続信号の送信回数値３０を含む。部分識別符号２３は受信者の識別符号１２桁のうちの４桁値とする。
【００３７】
２つめはデータ信号であり、制御コード２４と識別符号２５と伝送情報２６とからなる。識別信号２５を受信して通信相手を確認し伝送情報２６を受信する。制御コード２４にはこの制御コード自身がデータ信号の一部であることを示す情報を含む。識別符号２５は受信者の識別符号１２桁全てである。伝送情報２６は送信者から受信者に伝送したい情報である。
【００３８】
本実施例はここで図２中（１）や（２）のように接続信号を繰り返す毎に部分識別符号２３の抽出部分を変更する。（１）の方法１では接続信号の１回目に識別符号２４の上位４桁を、２回目に中位４桁を、３回目に下位４桁を含める。４回目からは再び、上位４桁、中位４桁、下位４桁とする。受信者は予めこの順序を、つまり接続信号の１回目に識別符号２４の上位４桁を、２回目に中位４桁を、３回目に下位４桁を含めることを知っており制御コード２２中の送信回数値３０によって受信した部分識別符号２３の抽出位置がわかる。したがって自身の識別符号に似た識別符号が存在しても受信者は接続信号を繰り返し受信する途中で識別でき受信を中断することができる。
【００３９】
これを図３で説明する。送信者から出力される通信電文フォーマット（１）には部分識別符号は（２）のように下位４桁２７、中位４桁２８、上位４桁２９が繰り返される。これを受信する受信装置は、これが自身の識別符号であれば（３）のようにデータ信号の最後まで受信する。識別符号の下４桁がたまたま自身の識別符号（受信者が備える識別符号）と同じで残りの上位８桁が異なる受信者が存在した場合（４）のように接続信号を２回受信した時点で受信中断できる。従来は図８のように自身の識別符号に似た識別符号を持つ受信装置が存在すると受信装置は接続信号だけではこの二つを識別できずデータ信号の途中まで受信していた。
【００４０】
図２では送信回数値を制御コードに含めて送信するので接続信号の途中から受信しても確実に識別符号を比較することができる。送信回数値がなければ接続信号の最初から受信することが絶対条件となる。なお、送信回数値の代わりに繰り返し送信する接続信号個々にユニークな値であれば同様の効果が得られる。
【００４１】
また、送信者は接続信号を繰り返し送信しながら部分識別符号の抽出部分を変更するときに接続信号を最初から最後まで受信すると識別符号全体を少なくとも含むように抽出する。図２では接続信号を多くとも３回受信すれば識別符号１２桁がわかる。したがって、受信者は繰り返し送信する接続信号を受信する途中で識別符号全体がわかるので、自身の識別符号に似た識別符号が存在しても受信装置は接続信号を繰り返し受信する途中で、３回で受信すれば確実に識別でき受信を中断することができる。
【００４２】
図２中（２）の方法２では接続信号の１回目に識別符号２５の下位４桁を、２回目に中位４桁を、３回目に上位４桁を含める。受信者は予め接続信号の１回目に識別符号２５の下位４桁を、２回目に中位４桁を、３回目に上位４桁を含めることを知っており制御コード２２中の送信回数値によって受信した部分識別符号２３の抽出位置がわかる。したがって自身の識別符号に似た識別符号が存在しても受信者は接続信号を繰り返し受信する途中で識別でき受信を中断することができる。
【００４３】
このように送信装置は接続信号を繰り返し送信しながら部分識別符号の抽出部分を識別符号の上位部分から下位部分へ移動させる、または下位部分から上位部分へ移動させる。これで自身の識別符号に似た識別符号が存在しても系統的に識別することができる。例えば識別符号の上位４桁がシステム分類、下位８桁が端末分類を示すとする。複数システムが多数混在する場合には（１）の方法１のように上位部分から下位部分へ移動させ、システムを識別してから端末を識別する方法が有効である。また複数端末が多数混在する場合には（２）の方法２のように下位部分から上位部分へ移動させ、端末を識別してからシステムを識別する方法が有効である。
【００４４】
複数システム・複数端末が多数混在する場合には（１）の方法１と（２）の方法２とを組み合わせる。接続信号の１〜３回目は（１）の方法１を、接続信号の４〜６回目は（２）の方法２というようにする。
【００４５】
あるいはまた、接続信号３回毎に切り替えるのが複雑であれば、データ信号を送信する度に部分識別符号の抽出部分を予め定めた順序で変更する。例えば、今回の送信は（１）の方法１で送信し、次回の送信は（２）の方法２で送信する。これで通信を行う度に部分識別符号の抽出部分の変更パターンが変わるので、受信者は接続信号を受信する途中で特定の識別符号の受信中断が常に遅れるということをなくすことができる。
【００４６】
これらにより、識別符号１２桁のうち下位４桁が異なる識別符号が存在したとき（１）の方法１では接続信号を３回受信するまで判断できないが（２）の方法２では接続信号を１回受信すると判断できる。接続信号３回毎あるいは送信毎に（１）の方法１と（２）の方法２とを切り替えるので平均して接続信号を２回受信して判断できると見積もることができる。
【００４７】
以上の部分識別符号制御は図１の通信制御手段７、識別符号抽出手段９、位置特定符号検知手段１１、部分識別符号比較手段１２で行う。送信時、識別符号抽出手段９は通信相手の識別符号から部分識別符号を抽出して送信電文に挿入する。送信回数値は通信制御手段７で計数して送信電文に部分識別符号とともに含める。一方で受信時、位置特定符号検出手段１１は受信した接続信号中の制御コードから送信回数値を判定し部分識別符号比較手段１２に出力する。この送信回数値を利用して部分識別符号比較手段１２は受信した接続信号中の部分識別符号と自身の識別符号とを比較する。
【００４８】
（実施例２）
以上の方法は送信者と受信者との双方で部分識別符号の抽出位置について予め知っていることが必要である。したがって抽出位置について複雑な変更パターンには適さない。次に送信者が抽出位置を自在に変更しても受信者が確実に識別符号を判断することができる方法を説明する。
【００４９】
図４に無線送受信装置間で通信される電文フォーマットを示す。図２と同様に通信電文は大きく分けて２つから構成される。そのうち接続信号内の制御コード２２に位置特定符号３１を含める。
【００５０】
位置特定符号３１は部分識別符号の抽出位置を示すもので、これにより部分識別符号４桁が識別符号１２桁のどの部分かを示す。図３中の（１）の方法１〜（３）の方法３では部分識別符号の１桁目が識別符号の何桁目にあたるかを位置特定符号とした。受信者は位置特定符号３１によって部分識別符号の抽出位置がわかるので送信者が抽出位置を自在に変更しても受信者は確実に識別符号を比較することができる。
【００５１】
図４では（１）の方法１や（２）の方法２のように実施例１と同様のことが可能な他、（３）の方法３のように部分識別符号をランダムに変えることが可能である。複数システム・複数端末が多数混在する場合に（１）の方法１と（２）の方法２とを組み合わせ方法があるが（３）の方法３でも同様の効果が期待できる。部分識別符号の抽出部分をランダムに変更するので受信者は接続信号を受信する途中で特定の識別符号の受信中断が常に遅れるということをなくすことができる。乱数を発生させるので、部分識別符号を上位部分から下位部分に変更させるといった変更手順をプログラムすることが不要である。
【００５２】
また図４の（４）の方法４のように、位置特定符号３１の定義を表１のように「ID1」=上位４桁、「ID2」＝中位４桁、「ID3」＝下位４桁等と定義しても同様の効果が得られる。
【００５３】
【表１】

【００５４】
（実施例３）
次に図５に基づいて間欠受信待ち受けにおける通信方法を説明する。
【００５５】
受信者は、一定時間Ｔ１おきに断続して接続信号を探索して受信する間欠受信待ち受けを行い、接続信号内の部分識別符号と受信者の備える識別符号の一部分とが一致しないときに次のＴ１後まで接続信号の探索を中断し、送信者は、接続信号をＴ１時間以上繰り返し送出してからデータ信号を送信する。
【００５６】
（１）に送信者Ａの動作を、（２）、（３）に送信者Ａと通信すべき受信者Ｂの動作を、（４）、（５）に送信者Ａと通信不要な受信者Ｃの動作を示す。
【００５７】
送信者Ａから（１）のように接続信号の繰り返し部とデータ信号とからなる送信信号を送信する。
【００５８】
受信者Ｂ、Ｃは（２）、（５）の受信待ち受け周期Ｔ１時間毎に受信回路の電源をオンしてＴ２時間のあいだ接続信号を受信待ち受けする。自身宛ての信号がなければ次の待ち受け周期まで受信回路の電源をオフして受信回路の消費電流を抑えるよう動作する。したがって電池寿命をのばすため間欠周期Ｔ１を長くしＴ２を短くする。また接続信号の繰り返し送信時間をＴ１よりも長くする。
【００５９】
受信者Ｂは（３）のように接続信号を受信し識別符号の一致を確認しながらデータ信号の終了まで受信（受信完了）し受信回路の電源をオフする。
【００６０】
本発明では接続信号を繰り返す毎に部分識別符号の抽出部分を変えるので、受信者Ｃは（５ａ）のように接続信号を何回か受信する途中で識別符号の不一致を判断し受信回路の電源をオフする（受信中断）。従来は自身の識別符号に似た識別符号が存在すると（５ｂ）のようにデータ信号の途中まで識別符号の不一致を判断できず受信回路の電源をオフするタイミングが遅かった。
【００６１】
以上のように、本発明では接続信号内の部分識別符号と自身の識別符号の一部分とが似ていても一致しないことを判断する時間が長くならず間欠受信待ち受け時の消費電力が減って電池寿命を延ばすことができる。
【００６２】
（実施例４）
次に図６に基づいて多チャネル受信待ち受けにおける通信方法を説明する。
【００６３】
受信者は、複数ある（Ｎ個）通信チャネルを順次切換えて接続信号を探索して受信する多チャネル受信待ち受けを行い、接続信号内の部分識別符号と受信者の備える識別符号の一部分とが一致しないときに受信を中断し通信チャネルを切換えて接続信号の探索を行い、送信者は、複数（Ｎ個）の通信チャネルの中から１つの通信チャネルを選択し接続信号をＮ回以上繰り返し送出してからデータ信号を送信する。
【００６４】
（１）、（２）に送信者ＡとＢの動作を、（３）に送信者Ｂと通信すべき受信者Ｃの動作を示す。
【００６５】
送信者ＡとＢとからほぼ同時に送信信号が送信する。ここで送信者Ａは１チャネルで、送信者Ｂは２チャネルで送信する。
【００６６】
受信者Ｃは１チャネルと２チャネルとを交互に接続信号の受信待ち受けをする。自身宛ての信号がなければ受信を中断し通信チャネルを切換えて別の接続信号の探索を行う。
【００６７】
ここで受信者Ｃは（３）のように１チャネルで先に送信者Ａからの接続信号を受信する。本発明では接続信号を繰り返す毎に部分識別符号の抽出部分を変えるので、接続信号を何回か受信する途中で識別符号の不一致を判断し受信周波数を２チャネルに切り替える（受信中断）。すると送信者Ｂからの接続信号を受信し識別符号の一致を確認しながらデータ信号の終了まで受信（受信完了）できる。
【００６８】
なお、従来は自身の識別符号に似た識別符号が存在すると（４）のように送信者Ａからの送信信号をデータ信号の途中まで識別符号の不一致を判断できず、受信周波数を切り替えるタイミングが遅くて送信者Ｂからの接続信号を受信できなかった。
【００６９】
以上のように、本実施例では接続信号内の部分識別符号と自身の識別符号の一部分とが似ていても一致しないことを判断する時間が長くならず通信チャネルを切換える周期が早くなって通信相手からの送信信号の受信を確実にすることができる。
【００７０】
なお、受信者がＮチャネルを切換ながら多チャネル受信待ち受けを行うとき、１回の送信で確実に受信するために接続信号をＮ回以上繰り返す。
【００７１】
なお、実施例では識別符号として受信者を指定する受信者識別符号で説明したが、送信者を指定する送信者識別符号に部分識別符号を用いてもよい。あるいは送信者と受信者とに共通の識別符号であってもよい。また識別符号を１２桁、部分識別符号を４桁として説明したがこれに限るものではない。識別符号の桁数が多いほど、また部分識別符号の桁数が少ないほど効果がある。
【００７２】
【発明の効果】
以上の説明から明らかなように本発明の通信方法によれば、通信相手でない受信装置で識別符号が異なることを判断するまでの時間を短くすることが可能となる。
【００７４】
従来は自身のものと似た識別符号では通信相手でない受信装置で識別符号が異なることを判断するまでの時間が長くなることがあったが、このときでも部分識別符号の効果を発揮させることができる。
【００７６】
接続信号を繰り返す毎に部分識別符号の抽出部分が変わるので、自身の識別符号に似た識別符号が存在しても受信装置は接続信号を繰り返し受信する途中で識別でき受信を中断することができる。
【００７８】
受信装置は送信回数値によって部分識別符号の抽出位置がわかるので接続信号の途中から受信しても確実に識別符号を比較することができる。
【００７９】
受信装置は位置特定符号によって部分識別符号の抽出位置がわかるので送信装置が抽出位置を自在に変更しても受信装置は確実に識別符号を比較することができる。
【００８０】
繰り返し送信する接続信号を受信する途中で識別符号全体がわかるので、自身の識別符号に似た識別符号が存在しても受信装置は接続信号を繰り返し受信する途中で確実に識別でき受信を中断することができる。
【００８２】
部分識別符号の抽出部分をランダムに変更するので受信装置は接続信号を受信する途中で特定の識別符号の受信中断が常に遅れるということをなくすことができる。
【図面の簡単な説明】
【図１】本発明の実施例１の通信方法における無線送受信装置のブロック図
【図２】同装置における通信電文フォーマットを示す図
【図３】同装置における送信者と受信者の動作を説明する図
【図４】本発明の実施例２の通信方法における通信電文フォーマットを示す図
【図５】本発明の実施例３の通信方法における送信者と受信者の動作を説明する図
【図６】本発明の実施例４の通信方法における送信者と受信者の動作を説明する図
【図７】従来の通信方法における通信電文フォーマットを示す図
【図８】同方法の送信者と受信者の動作を説明する図
【符号の説明】
１無線アンテナ
２無線信号
３受信手段
４受信回路制御手段
５送信手段
６送信回路制御手段
７通信制御手段
８識別符号記憶手段
９識別符号抽出手段
１０識別符号比較手段
１１位置特定符号検知手段
１２部分識別符号比較手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication method for repeatedly transmitting a connection signal including an identification code from a transmission device by performing communication between a transmission device and a reception device by using an identification code to confirm a communication partner and transmitting / receiving a data signal. This shortens the time until it is determined that the identification code is different in the receiving device that is not the communication partner.
[0002]
For example, it shortens the time until it is determined that the identification code is different when waiting for intermittent reception to extend the battery life of the receiving device, or the identification code is used when communicating from a plurality of communication channels using one communication channel. By shortening the time until it is determined that the two are different, the cycle of switching the communication channel in the receiving apparatus is shortened.
[0003]
[Prior art]
A communication method for repeatedly transmitting a connection signal including an identification code from a transmission device by using a identification code to determine a communication partner and transmitting / receiving a data signal when communicating between a transmission device and a reception device. Kaihei 10-198881 will be described.
[0004]
FIG. 7 shows a communication message format. A communication message is roughly divided into the following three.
[0005]
The first is a portion determined by the standard and must be transmitted, and corresponds to the bit synchronization signal 51, the frame synchronization signal 52, and the radio call name 53 in FIG. 7 (however, this is not relevant in the present invention).
[0006]
The second is a connection signal repetitive transmission unit as referred to in the present invention, and includes an identification code. The system activation signal 54 in FIG. 7 corresponds to this, and the shortened type / call name 57 is a partial identification code in the present invention. In addition to the shortened type / call name, one unit including the short bit synchronization signal 55 and the system identification code 56 corresponds to the connection signal.
[0007]
The third is a data signal as referred to in the present invention. The other station / restriction information in FIG. 7 (the other station / radio call name is included in this and the abbreviated type / call name is a part of this) 58, control Information (data) 59 corresponds to this.
[0008]
In this Japanese Patent Laid-Open No. 10-198881, the identification code is 12 digits, and the last 4 digits are included in the connection signal as a partial identification code for transmission. This solves the following inconvenience that occurs when the identification code is long. If the identification code is long, the transmission time for one connection signal becomes long, and the time until it is determined that the identification code is different in the receiving apparatus that is not the communication partner becomes long. In addition, it is desirable to shorten the transmission time by setting the repetitive transmission time of the connection signal to the time required for reception by the receiving device (in this figure, the intermittent carrier sense interval). It may occur that the transmission time becomes longer and becomes longer than the intermittent carrier sense interval.
[0009]
On the other hand, by using a partial identification code for the connection signal, it is possible to reduce the time for determining whether or not to receive even if the identification code is long, and not to make the transmission time of the connection signal longer than necessary.
[0010]
[Problems to be solved by the invention]
As described above, the transmission apparatus repeatedly transmits a data signal after continuously transmitting a connection signal including a partial identification code obtained by extracting a part of an identification code for identifying a communication partner for a time required for the reception apparatus to receive the data signal. On the other hand, the reception device receives the connection signal from the transmission device, and performs a data signal reception process when it is confirmed that the partial identification code in the connection signal is a part of the identification code included in the reception device. .
[0011]
In the example of Japanese Patent Application Laid-Open No. 10-198881, first, the last four digits are checked with the partial identification code in the connection signal, and if the partial identification codes match, the remaining upper 8 bits are continued with the identification code in the data signal. Check the digit to determine the communication partner.
[0012]
By using a partial identification code for the connection signal, it is possible to reduce the time for determining whether or not to receive even if the identification code is long, and not to make the connection signal transmission time longer than necessary. However, the effect of the partial identification code may not be exhibited under certain conditions.
[0013]
A case will be described with reference to FIG. 8 where the last four digits of the identification code happen to be the same as its own identification code (identification code included in the receiving device) and the remaining upper 8 digits are different. This probability is 1/100 when there are 100 receiving devices with different identification codes in the communication area of each receiving device.
[0014]
In the communication message format (1) output from the transmission device, the lower four digits are repeated as shown in (2) for the partial identification code. If this is an identification code of its own, the receiving apparatus receives it until the end of the data signal as in (3), and if it is an identification code similar to its own, the data as in (4) Reception is interrupted when the signal is received halfway and compared with 12 digits of the identification code. That is, if there is a receiving device having an identification code similar to its own identification code, the receiving device cannot identify the two at the time of receiving the connection signal, and receives the data signal halfway. The longer the connection signal repetition transmission time, the more prominent the following problem.
[0015]
When waiting for intermittent reception as disclosed in Japanese Patent Laid-Open No. 10-198881, if the received signal is not addressed to itself, the reception is interrupted and the current consumption of the receiving circuit is suppressed. Usually, in order to extend battery life, the time interval of intermittent carrier sense is lengthened and the repeated transmission time of the connection signal is lengthened. Therefore, if there is an identification code similar to its own identification code, the receiving device cannot interrupt the reception in the middle of the connection signal, and receives the connection signal having a long transmission time until the end, so that the battery life is shortened.
[0016]
In addition, a problem arises in a transmission device / reception device that waits for multi-channel reception. Multi-channel reception standby means that the receiving apparatus sequentially switches a plurality of communication channels (N) and searches for a connection signal to wait for reception, and when the identification code in the connection signal does not match the identification code of itself. The reception signal is interrupted and the communication channel is switched to search for a connection signal. The communication message format transmitted from the transmission device is the same as that shown in FIG. 8. One communication channel is selected from a plurality of communication channels (N), and a connection signal is repeatedly transmitted N times or more before transmitting a data signal.
[0017]
At this time, if there is an identification code similar to its own identification code, the receiving apparatus cannot interrupt the reception in the middle of the connection signal and receives the connection signal having a long transmission time to the end. As a result, it is delayed to search for another connection signal by switching the communication channel. During this time, if there is a transmission signal from the other party to communicate with, it cannot be received.
[0018]
An object of the present invention is to exert the effect of a partial identification code even when an identification code similar to its own identification code exists.
[0019]
[Means for Solving the Problems]
  In order to solve the above-described problems, the present invention provides a receiving apparatus that receives a connection signal including a partial identification code obtained by extracting a part of an identification code for identifying a communication partner when communication is performed between a transmitting apparatus and a receiving apparatus. The data signal including the identification code is transmitted after being repeatedly transmitted continuously over the time necessary for reception, and the reception device receives the connection signal from the transmission device and receives the partial identification code in the connection signal and the reception device. When it is confirmed that a part of the identification code included in the data matches, the data signal reception process is performed.changeIs.Then, the transmission device transmits the connection signal including the connection signal transmission count value and the partial identification code, and the reception device uses the transmission count value in the connection signal to transmit the partial identification code and the identification code of the reception device. It confirms that a part of is consistent.
[0020]
  According to the above-described invention, the extracted part of the partial identification code changes each time the connection signal is repeated. Therefore, even if an identification code similar to its own identification code exists, the receiving apparatus can identify and receive it while it repeatedly receives the connection signal. Can be interrupted.And since the receiving device knows the extraction position of the partial identification code from the value of the number of transmissions, it can reliably compare the identification code even if it is received from the middle of the connection signal.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be carried out in the forms described in the claims.
[0022]
  That is, as in the first aspect of the invention, the transmission device extracts the partial identification code each time the connection signal is repeated.ChangeIs. And, each time the connection signal is repeated, the extracted part of the partial identification code changes, so that even if an identification code similar to its own identification code exists, the receiving device can identify it in the middle of repeatedly receiving the connection signal and interrupt reception. Can do.
[0024]
  And sendThe apparatus transmits the connection signal including the transmission frequency value and the partial identification code of the connection signal, and the reception apparatus uses the transmission frequency value in the connection signal to transmit the partial identification code and a part of the identification code included in the reception apparatus. Is to confirm that they match. And since the receiving device knows the extraction position of the partial identification code from the value of the number of transmissions, it can reliably compare the identification code even if it is received from the middle of the connection signal.
[0025]
  Claims2As described in the invention, the transmitting device transmits a connection signal together with a position specifying code indicating the extraction position of the partial identification code, and the receiving device uses the position specifying code in the connection signal to transmit the partial identification code and the receiving device. It confirms that a part of the identification code with Since the receiving device can know the extraction position of the partial identification code by the position specifying code, the receiving device can reliably compare the identification codes even if the transmission device freely changes the extraction position.
[0026]
  And claims3As described in the invention, the transmission device extracts the identification signal so as to include at least the entire identification code when receiving the connection signal from the beginning to the end when changing the extraction portion of the partial identification code while repeatedly transmitting the connection signal. . Since the entire identification code is known in the middle of receiving the connection signal to be repeatedly transmitted, the receiving apparatus can reliably identify and receive the reception in the middle of repeatedly receiving the connection signal even if an identification code similar to its own identification code exists. Can be interrupted.
[0028]
  Claims4As in the described invention, the transmission device randomly changes the extraction part of the partial identification code while repeatedly transmitting the connection signal. And since the extraction part of a partial identification code is changed at random, the receiving apparatus can eliminate that the reception interruption of a specific identification code is always delayed in the middle of receiving a connection signal.
[0031]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0032]
(Example 1)
FIG. 1 is a block diagram illustrating a configuration of a wireless transmission / reception apparatus according to Embodiment 1 of the present invention. In order to communicate with the other party's wireless transmission / reception apparatus, the receiving means 3 that receives the radio signal 2 from the other party's wireless transmission / reception apparatus via the antenna 1 and demodulates it into a received message such as a connection signal or a data signal; Receiving circuit control means 4 for controlling off, reception frequency, etc., transmitting means 5 for modulating a transmission telegram and transmitting a radio signal 2 to the other radio transmitting / receiving apparatus via the antenna 1, power on of the transmitting means 5 Transmission circuit control means 6 for controlling off, transmission frequency, etc., and receiving communication from the receiving means 3 for decoding and receiving processing and passing the transmission message to the transmission means 5 for controlling the entire communication, for example, communication control means comprising a microcomputer 7 is composed.
[0033]
Further, a unique identification code is used for each wireless transmission / reception device to identify a communication partner, and the identification code of the wireless transmission / reception device itself and the identification code of the communication partner are stored in the identification code storage means 8 at the time of initial setting. The identification code is read from this identification code storage means 8, and at the time of transmission, the identification code of the communication partner is inserted as a code for identifying the receiver in the transmission message. At the time of reception, only a message in which the receiver identification code in the received message matches its own identification code is decoded. If necessary, insert the identification code of the sender as a code to identify the sender in the transmitted message, and the receiver confirms that the sender identification code in the received message matches the identification code of the sender. May be.
[0034]
In FIG. 1, the identification code extraction means 9 extracts the identification code of the communication partner to be inserted into the transmission message, and the identification code comparison means 10 compares the recipient identification code in the reception message with its own identification code and inserts it. Make sure that it is.
[0035]
The message format communicated between the wireless transmission / reception apparatuses in FIG. 1 is shown in FIG. The communication message is roughly divided into the following two.
[0036]
The first is a connection signal repetitive transmission unit, and one connection signal includes a bit synchronization signal 20, a frame synchronization signal 21, a control code 22, and a partial identification code 23. The receiver receives the bit synchronization signal 20 to synchronize with the transmitter, receives the frame synchronization signal 21, and knows the head of the control code 22. The control code 22 includes a connection signal transmission count value 30. The partial identification code 23 is a 4-digit value out of 12 digits of the identification code of the receiver.
[0037]
The second is a data signal, which comprises a control code 24, an identification code 25, and transmission information 26. The identification signal 25 is received, the communication partner is confirmed, and transmission information 26 is received. The control code 24 includes information indicating that the control code itself is a part of the data signal. The identification code 25 is all 12 digits of the identification code of the recipient. Transmission information 26 is information to be transmitted from the sender to the receiver.
[0038]
In this embodiment, the extraction part of the partial identification code 23 is changed every time the connection signal is repeated as shown in FIG. 2 (1) and (2). In method 1 of (1), the upper 4 digits of the identification code 24 are included in the first connection signal, the middle 4 digits in the second time, and the lower 4 digits in the third time. From the 4th time, the upper 4 digits, the middle 4 digits, and the lower 4 digits again. The receiver knows in advance this order, that is, to include the upper 4 digits of the identification code 24 at the first time of the connection signal, the middle 4 digits at the second time, and the lower 4 digits at the third time. The extraction position of the received partial identification code 23 is known by the transmission number value 30 of. Accordingly, even if an identification code similar to its own identification code exists, the receiver can identify the receiver in the middle of repeatedly receiving the connection signal, and can interrupt reception.
[0039]
This will be described with reference to FIG. In the communication message format (1) output from the sender, the partial identification code is repeated with the lower 4 digits 27, the middle 4 digits 28, and the upper 4 digits 29 as shown in (2). If this is its own identification code, the receiving apparatus that receives it receives it to the end of the data signal as in (3). When the last 4 digits of the identification code happens to be the same as the identification code of the receiver (identification code provided by the receiver) and the remaining upper 8 digits are different, and when the connection signal is received twice as in (4) You can suspend reception. Conventionally, when there is a receiving device having an identification code similar to its own identification code as shown in FIG. 8, the receiving device cannot identify the two by the connection signal alone, and has received part of the data signal.
[0040]
In FIG. 2, since the transmission count value is included in the control code and transmitted, the identification codes can be reliably compared even if received from the middle of the connection signal. If there is no transmission count value, it is an absolute condition to receive from the beginning of the connection signal. The same effect can be obtained if each connection signal repeatedly transmitted instead of the transmission count value is unique.
[0041]
Further, when the transmission signal is transmitted repeatedly from the beginning to the end when changing the extraction part of the partial identification code while repeatedly transmitting the connection signal, the sender extracts at least the entire identification code. In FIG. 2, if the connection signal is received at most three times, the identification code of 12 digits can be known. Therefore, since the receiver can see the entire identification code in the middle of receiving the connection signal to be repeatedly transmitted, even if there is an identification code similar to its own identification code, the receiving device repeatedly receives the connection signal three times. If it is received, it can be reliably identified and the reception can be interrupted.
[0042]
In method 2 of (2) in FIG. 2, the lower 4 digits of the identification code 25 are included in the first connection signal, the middle 4 digits in the second time, and the upper 4 digits in the third time. The receiver knows in advance that the lower 4 digits of the identification code 25 are included in the first connection signal, the middle 4 digits in the second time, and the upper 4 digits in the third time. The extraction position of the received partial identification code 23 is known. Accordingly, even if an identification code similar to its own identification code exists, the receiver can identify the receiver in the middle of repeatedly receiving the connection signal, and can interrupt reception.
[0043]
In this way, the transmission apparatus moves the extraction part of the partial identification code from the upper part to the lower part of the identification code, or moves from the lower part to the upper part while repeatedly transmitting the connection signal. Thus, even if an identification code similar to its own identification code exists, it can be systematically identified. For example, it is assumed that the upper 4 digits of the identification code indicate the system classification and the lower 8 digits indicate the terminal classification. When a plurality of systems coexist, it is effective to move from the upper part to the lower part as in method 1 of (1) and identify the terminal after identifying the system. When a plurality of terminals coexist, it is effective to move from the lower part to the upper part and identify the system after identifying the terminal as in method 2 of (2).
[0044]
When a plurality of systems and a plurality of terminals coexist, the method 1 of (1) and the method 2 of (2) are combined. The first to third connection signals are referred to as method 1 in (1), and the fourth to sixth connection signals are referred to as method 2 in (2).
[0045]
Alternatively, if it is complicated to switch every three connection signals, the extraction part of the partial identification code is changed in a predetermined order every time a data signal is transmitted. For example, the current transmission is transmitted by the method 1 of (1), and the next transmission is transmitted by the method 2 of (2). Since the change pattern of the part for extracting the partial identification code changes each time communication is performed, the receiver can be prevented from always delaying the reception of the specific identification code in the middle of receiving the connection signal.
[0046]
As a result, when there is an identification code in which the lower 4 digits are different among the 12 digits of the identification code, the method 1 of (1) cannot be judged until the connection signal is received three times, but the method 2 of (2) does not determine the connection signal once. It can be determined that it will be received. Since the method 1 of (1) and the method 2 of (2) are switched every three connection signals or every transmission, it can be estimated that the connection signal can be received and judged on average.
[0047]
The above partial identification code control is performed by the communication control means 7, the identification code extraction means 9, the position identification code detection means 11, and the partial identification code comparison means 12 shown in FIG. At the time of transmission, the identification code extraction means 9 extracts a partial identification code from the identification code of the communication partner and inserts it in the transmission message. The transmission count value is counted by the communication control means 7 and included in the transmission message together with the partial identification code. On the other hand, at the time of reception, the position identification code detection means 11 determines a transmission count value from the control code in the received connection signal and outputs it to the partial identification code comparison means 12. Using this transmission count value, the partial identification code comparison means 12 compares the partial identification code in the received connection signal with its own identification code.
[0048]
(Example 2)
In the above method, it is necessary that both the sender and the receiver know in advance the extraction position of the partial identification code. Therefore, the extraction position is not suitable for a complicated change pattern. Next, a method for allowing the receiver to reliably determine the identification code even when the sender freely changes the extraction position will be described.
[0049]
FIG. 4 shows a message format communicated between wireless transmission / reception devices. Similar to FIG. 2, the communication telegram is roughly divided into two. Among them, the position specifying code 31 is included in the control code 22 in the connection signal.
[0050]
The position specifying code 31 indicates the extraction position of the partial identification code, and thereby indicates which part of the 12-digit identification code is the 4-digit partial identification code. In method 1 of (1) to method 3 of (3) in FIG. 3, the position identification code is the number of digits of the identification code corresponding to the first digit of the partial identification code. Since the receiver can know the extraction position of the partial identification code by the position specifying code 31, even if the sender freely changes the extraction position, the receiver can reliably compare the identification codes.
[0051]
In FIG. 4, in addition to the same method as in the first embodiment as in method 1 of (1) and method 2 of (2), the partial identification code can be changed randomly as in method 3 of (3). It is. When there are a large number of a plurality of systems and a plurality of terminals, there is a method of combining the method 1 of (1) and the method 2 of (2), but the same effect can be expected with the method 3 of (3). Since the extracted part of the partial identification code is randomly changed, the receiver can eliminate the fact that the reception interruption of the specific identification code is always delayed while receiving the connection signal. Since random numbers are generated, it is not necessary to program a change procedure for changing the partial identification code from the upper part to the lower part.
[0052]
Also, as in method 4 of FIG. 4 (4), the position identification code 31 is defined as “ID1” = upper 4 digits, “ID2” = middle 4 digits, and “ID3” = lower 4 digits as shown in Table 1. The same effect can be obtained even if defined as.
[0053]
[Table 1]

[0054]
(Example 3)
Next, a communication method in standby for intermittent reception will be described based on FIG.
[0055]
The receiver performs intermittent reception waiting to search for and receive a connection signal intermittently every fixed time T1, and when the partial identification code in the connection signal does not match a part of the identification code provided by the receiver, The search for the connection signal is interrupted until after T1, and the sender repeatedly transmits the connection signal for T1 time or more and then transmits the data signal.
[0056]
(1) shows the action of the sender A, (2) and (3) shows the action of the receiver B who should communicate with the sender A, and (4) and (5) show the receiver who does not need to communicate with the sender A. The operation of C is shown.
[0057]
As shown in (1), the transmitter A transmits a transmission signal composed of a connection signal repeater and a data signal.
[0058]
The receivers B and C turn on the power of the receiving circuit every reception waiting period T1 time of (2) and (5) and wait for reception of a connection signal for T2 hours. If there is no signal addressed to itself, the power supply of the receiving circuit is turned off until the next standby period, and the current consumption of the receiving circuit is suppressed. Therefore, in order to extend the battery life, the intermittent period T1 is lengthened and T2 is shortened. The repetition transmission time of the connection signal is made longer than T1.
[0059]
The receiver B receives the connection signal as shown in (3), receives it until the end of the data signal while confirming the coincidence of the identification codes (reception is completed), and turns off the power of the receiving circuit.
[0060]
In the present invention, the extraction part of the partial identification code is changed every time the connection signal is repeated. Therefore, the receiver C determines the mismatch of the identification code while receiving the connection signal several times as shown in (5a), and the power supply of the receiving circuit. Is turned off (reception is interrupted). Conventionally, when an identification code similar to its own identification code exists, it is not possible to determine the mismatch of the identification code until the middle of the data signal as shown in (5b), and the timing to turn off the power of the receiving circuit is late.
[0061]
As described above, according to the present invention, even if the partial identification code in the connection signal is similar to a part of its own identification code, it does not take a long time to determine that the partial identification code does not match, and the power consumption during standby reception is reduced. Life can be extended.
[0062]
(Example 4)
Next, a communication method in multi-channel reception standby will be described with reference to FIG.
[0063]
The receiver sequentially waits for multi-channel reception to search and receive a connection signal by sequentially switching a plurality of (N) communication channels, and the partial identification code in the connection signal matches a part of the identification code provided by the receiver. If not, the reception is interrupted, the communication channel is switched and the connection signal is searched, and the sender selects one communication channel from a plurality (N) of communication channels and repeatedly transmits the connection signal N times or more. Then send the data signal.
[0064]
The operations of the senders A and B are shown in (1) and (2), and the operation of the receiver C to be communicated with the sender B is shown in (3).
[0065]
Transmission signals are transmitted almost simultaneously from the senders A and B. Here, the transmitter A transmits with one channel and the transmitter B transmits with two channels.
[0066]
The receiver C waits for reception of a connection signal alternately for the first channel and the second channel. If there is no signal addressed to itself, reception is interrupted and the communication channel is switched to search for another connection signal.
[0067]
Here, the receiver C receives the connection signal from the transmitter A first in one channel as shown in (3). In the present invention, the extracted part of the partial identification code is changed every time the connection signal is repeated. Therefore, in the middle of receiving the connection signal several times, the identification code mismatch is determined and the reception frequency is switched to two channels (reception interruption). Then, the connection signal from the sender B can be received and received (reception completion) until the end of the data signal while confirming the coincidence of the identification codes.
[0068]
Conventionally, when there is an identification code similar to its own identification code, the transmission signal from the sender A cannot be judged until the middle of the data signal as shown in (4), and the timing for switching the reception frequency cannot be determined. It was too late to receive the connection signal from sender B.
[0069]
As described above, in this embodiment, even if the partial identification code in the connection signal and a part of its own identification code are similar, it does not take a long time to judge that they do not match, and the communication channel switching cycle becomes faster. The reception of the transmission signal from the other party can be ensured.
[0070]
When the receiver waits for multi-channel reception while switching the N channel, the connection signal is repeated N times or more in order to receive it reliably in one transmission.
[0071]
In the embodiment, the receiver identification code designating the receiver as the identification code has been described. However, a partial identification code may be used as the sender identification code designating the sender. Alternatively, it may be an identification code common to the sender and the receiver. Although the identification code is 12 digits and the partial identification code is 4 digits, the present invention is not limited to this. The larger the number of digits of the identification code and the smaller the number of digits of the partial identification code, the more effective.
[0072]
【The invention's effect】
As is clear from the above description, according to the communication method of the present invention, it is possible to shorten the time until it is determined that the identification code is different in the receiving apparatus that is not the communication partner.
[0074]
Conventionally, an identification code similar to that of itself may take a long time until it is determined that the identification code is different in a receiving apparatus that is not a communication partner, but even at this time, the effect of the partial identification code can be exhibited. it can.
[0076]
  Connection signalSince the extracted part of the partial identification code changes each time the signal is repeated, even if there is an identification code similar to its own identification code, the receiving apparatus can identify it during the repeated reception of the connection signal and can interrupt reception.
[0078]
  ReceiverSince the extraction position of the partial identification code is known from the transmission number value, the identification codes can be reliably compared even when received from the middle of the connection signal.
[0079]
  ReceiverSince the extraction position of the partial identification code is known by the position specifying code, the receiving apparatus can reliably compare the identification codes even if the transmission apparatus freely changes the extraction position.
[0080]
  repetitionSince the entire identification code is known in the middle of receiving the connection signal to be transmitted, even if there is an identification code similar to its own identification code, the receiving device can reliably identify in the middle of repeatedly receiving the connection signal and interrupt reception. Can do.
[0082]
  Partial knowledgeSince the extraction part of another code is changed at random, the receiving apparatus can eliminate the fact that the reception interruption of the specific identification code is always delayed during the reception of the connection signal.
[Brief description of the drawings]
FIG. 1 is a block diagram of a wireless transmission / reception apparatus in a communication method according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a communication message format in the same device
FIG. 3 is a diagram for explaining operations of a sender and a receiver in the apparatus
FIG. 4 is a diagram showing a communication message format in the communication method according to the second embodiment of the present invention.
FIG. 5 is a diagram for explaining operations of a sender and a receiver in the communication method according to the third embodiment of the present invention.
FIG. 6 is a diagram for explaining operations of a sender and a receiver in the communication method according to the fourth embodiment of the present invention.
FIG. 7 is a diagram showing a communication message format in a conventional communication method.
FIG. 8 is a diagram for explaining the operations of a sender and a receiver in the same method
[Explanation of symbols]
1 Wireless antenna
2 Radio signal
3 Receiving means
4 Receiving circuit control means
5 Transmission means
6 Transmission circuit control means
7 Communication control means
8 Identification code storage means
9 Identification code extraction means
10 Identification code comparison means
11 Position specific code detection means
12 Partial identification code comparison means

Claims

In a communication method in which communication is performed between a transmission device and a reception device,
The transmitting device repeatedly transmits a connection signal including a partial identification code obtained by extracting a part of an identification code for identifying a communication partner for a time necessary for the receiving device to receive the signal repeatedly, and then transmits the identification code. Send data signal containing,
The reception device receives a connection signal from the transmission device, performs a data signal reception process when confirming that a partial identification code in the connection signal matches a part of an identification code provided in the reception device,
In the communication method, wherein the transmission device changes a portion for extracting the partial identification code from the identification code each time the connection signal is repeated.
The transmitting device transmits the connection signal repeatedly transmitted including the connection signal transmission number value and the partial identification code, and the receiving device uses the transmission number value in the received connection signal. A communication method for confirming that the partial identification code and a part of the identification code included in the receiving device match.

In a communication method in which communication is performed between a transmission device and a reception device,
The transmitting device repeatedly transmits a connection signal including a partial identification code obtained by extracting a part of an identification code for identifying a communication partner for a time necessary for the receiving device to receive the signal repeatedly, and then transmits the identification code. Send data signal containing,
The reception device receives a connection signal from the transmission device, performs a data signal reception process when confirming that a partial identification code in the connection signal matches a part of an identification code provided in the reception device,
In the communication method, wherein the transmission device changes a portion for extracting the partial identification code from the identification code each time the connection signal is repeated.
The transmitting device transmits the connection signal repeatedly transmitted including the partial identification code and a position specifying code indicating a position of the extracted part, and the receiving device specifies the position specifying in the received connection signal. A communication method for confirming that the partial identification code and a part of the identification code included in the receiving device match using a code.

The transmission apparatus, when changing the part from which the partial identification code is extracted while repeatedly transmitting the connection signal, extracts the connection signal so as to include at least the entire identification code when received from the beginning to the end. The communication method according to claim 1 or 2, wherein the communication method is characterized.

The communication method according to claim 1, wherein the transmission device randomly changes a portion from which the partial identification code is extracted while repeatedly transmitting the connection signal.

In a communication system that performs communication between a transmission device and a reception device,
The transmitting device repeatedly transmits a connection signal including a partial identification code obtained by extracting a part of an identification code for identifying a communication partner for a time necessary for the receiving device to receive the signal repeatedly, and then transmits the identification code. Send data signal containing,
The reception device receives a connection signal from the transmission device, performs a data signal reception process when confirming that a partial identification code in the connection signal matches a part of an identification code provided in the reception device,
In the communication system, wherein the transmission device changes a part for extracting the partial identification code from the identification code each time the connection signal is repeated.
The transmitting device transmits the connection signal repeatedly transmitted including the connection signal transmission number value and the partial identification code, and the receiving device uses the transmission number value in the received connection signal. A communication system for confirming that the partial identification code and a part of the identification code included in the receiving device match.

In a communication system that performs communication between a transmission device and a reception device,
The transmitting device repeatedly transmits a connection signal including a partial identification code obtained by extracting a part of an identification code for identifying a communication partner for a time necessary for the receiving device to receive the signal repeatedly, and then transmits the identification code. Send data signal containing,
The reception device receives a connection signal from the transmission device, performs a data signal reception process when confirming that a partial identification code in the connection signal matches a part of an identification code provided in the reception device,
In the communication system, wherein the transmission device changes a part for extracting the partial identification code from the identification code each time the connection signal is repeated.
The transmitting device transmits the connection signal repeatedly transmitted including the partial identification code and a position specifying code indicating a position of the extracted part, and the receiving device specifies the position specifying in the received connection signal. A communication system that uses a code to confirm that the partial identification code and a part of the identification code included in the receiving device match.