JP2004289663A - Satellite connection line relocation control method - Google Patents

Satellite connection line relocation control method Download PDF

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JP2004289663A
JP2004289663A JP2003081262A JP2003081262A JP2004289663A JP 2004289663 A JP2004289663 A JP 2004289663A JP 2003081262 A JP2003081262 A JP 2003081262A JP 2003081262 A JP2003081262 A JP 2003081262A JP 2004289663 A JP2004289663 A JP 2004289663A
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band
procedure
bandwidth
frequency
communication line
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JP3982758B2 (en
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Satoshi Yamazaki
諭 山崎
Tomohiro Kida
智裕 喜田
Masanori Torii
正法 鳥居
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a stable system to complete rapid relocation of frequencies by minimizing the number of moving communication lines. <P>SOLUTION: A vacant band is searched for from a high band side, a communication line 16 whose bandwidth corresponds to the searched vacant band 12 is searched from a lower band side to move to the vacant band 12, and the vacant bands are filled. In cases where no communication line corresponding to the vacant band 12 is found, the communication line with narrower bandwidth than the vacant band 12 is searched to move to a higher band side within the vacant band 12. By repeating these processes, the vacant band 12 is progressively filled to perform the relocation of the frequencies. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、ＳＣＰＣ―ＦＤＭＡ方式の衛星回線ＤＡＭＡシステムにおいて、親局が通信回線に対して周波数を再配置する衛星回線の再配置制御方法に関する。
【０００２】
【従来の技術】
通信衛星を介して形成した無線通信路により、地上局間、又は、通信衛星と地上局間、又は通信衛星同士を結んだ通信が行われている。このような通信では、ほとんどの場合、異なる周波数帯からなる複数の通信回線が用いられ、親局（大抵は地上局であるが衛星に親局があっても良い）、は複数の回線を持ち、その使用状況に応じて、回線を子局との通信確立の都度、割り振り、通信終了時に開放する。このような方式は要求時回線割当方式（ＤＡＭＡ方式，Ｄｅｍａｎｄ Ａｓｓｉｇｎｍｅｎｔ Ｍｕｌｔｉｐｌｅ Ａｃｃｅｓｓ）と呼ばれており、例えば、特許文献１に開示されている。
【０００３】
各帯域の通信回線は、周波数が異なるので、当然、その特性に差がある。従ってそれぞれの特性を生かすように割り当てることや、あるいは、効率の良い回線はなるべく空回線とならないようにするために、使用している効率の良くない回線の使用を中止して効率の良い回線を割り当てることは極めて重要である。このような回線割り当てに付いては特許文献２に開示されている。
このように、一旦割り当ててある帯域を変更することを周波数再配置という。なお、以下の説明において、周波数再配置によって、ある帯域を異なる帯域に割り当てることを帯域の移動、又は単に移動と言う。
【０００４】
【特許文献１】
特開２００１−２８５６３号公報
【特許文献２】
特開平８−９４６４号公報
【０００５】
【発明が解決しようとする課題】
従来の周波数の再配置方法では、空き帯域より低い周波数帯域側の通信回線を全て移動するため、周波数の再配置に時間がかかり、多くの処理を必要とするため、非効率的でシステムの安定性にも問題があるという課題があった。
【０００６】
この発明は上記のような問題点を解消するためになされたもので、移動する通信回線を最小限にすることにより、迅速に周波数の再配置を完了し、安定したシステムを提供することを目的とする。
【０００７】
【課題を解決するための手段】
本願発明の衛星回線の再配置制御方法は、衛星を介して親局と子局間で、複数の無線通信回線を設定可能な周波数幅を有する周波数帯域に前記無線通信回線を親局が割り当てることにより通信を行う要求時回線割当（ＤＡＭＡ）方式の衛星回線において、
前記周波数帯域の、一方の周波数端から他方の周波数端へと空き帯域を検索し、空き帯域があれば、この空き帯域の帯域幅を調べる第１手順、
前記空き帯域の帯域幅と一致する帯域幅を有する通信回線を、前記周波数帯域の前記他方の周波数端から前記空き帯域の周波数まで検索する第２手順、
前記帯域幅が一致した通信回線を前記空き帯域へと移動する第３手順、
前記第１手順から前記第３手順に至る一連の手順を、前記第１手順において前記空き帯域が検索できなくなるまで繰り返す繰り返し手順とを含むものである。
【０００８】
【発明の実施の形態】
本発明の説明を行う前に、まず、周波数再配置の基本的な動作について説明する。図１６は横軸に周波数をとった周波数帯域配分図である。仮に、今、親局により、図１６ａ）に示すように、８１、８３、８４，８６，８７の通信回線が割り当てられていたとする。点線で示した８２と８５は空き帯域である。親局は、より高い周波数帯域を割り当てたいと思う場合には、空き帯域８２，８５を埋めるために、空き帯域８２より低い周波数帯域側（このことを低帯域側とも言う）にある通信回線８３，８４，８６，８７を、順次、自帯域に隣接する高い周波数側（このことを高帯域側とも言う）に空きがあるかないかを判定し、空きがあれば高い周波数帯域側へ詰めるという動作を、全ての帯域について、順次行ない、どの帯域についても高い周波数側に空きがないという状態になるまで繰り返し実行する。
【０００９】
即ち、まずａ）図からｂ）図のように帯域８２と通信回線８３とを入れ替える、次にｂ）図からｃ）図のように通信回線８４と帯域８２とを入れ替える。次にｃ）図からｄ）図のように通信回線８６と帯域８２、８５を入れ替える。次にｄ）図からｅ）図のように通信回線８７と帯域８５、８２とを入れ替える。これによつて、最終的には、図１６ｅ）に示すように再配置され、低い周波数端に空き帯域８５，８２が設けられる。このように何段階もの切り替えを必要とするので再配置に時間がかかる。
【００１０】
実施の形態１．
以下、この発明の実施の形態１の周波数再配置制御方法を、図１及び図２について説明する。実施の形態１は、空き帯域の周波数よりも低い周波数に、空き帯域と帯域幅が一致する通信回線が存在する場合の周波数の再配置方法を説明するものである。図１において横軸は周波数であり、図１ａ）は周波数再配置前、図１ｂ）は周波数再配置後である。図ａ）で、通信回線１１，１３，１４，１５，１６が割り当てられ、空き帯域１２が生じている。空き帯域１２と通信回線１６は同様の帯域幅を持っているとする。
次に、図２のフローチャートについて動作を説明する。周波数再配置処理を開始（Ｓａ１）すると、まず利用可能な帯域の、高い周波数端から低い周波数端に向けて、空き帯域の有無を検索し（Ｓａ２）、最初に空き帯域１２を発見する。このとき同時に空き帯域１２の帯域幅を調べる（Ｓａ３）、（ステップＳａ２，Ｓａ３を第１手順と言う）。次に、発見した空き帯域１２より低い周波数側に通信回線があれば（Ｓａ４のＹ）、低い周波数端から開始して、空き帯域１２までの間について、空き帯域１２と帯域幅が一致する通信回線を検索する（Ｓａ６、第２手順）。通信回線１６は空き帯域１２と帯域幅が一致する（Ｓａ７）ので、通信回線１６を空き帯域１２に移動して空き帯域を埋める（Ｓａ８、第３手順）。
そして再び第１手順から同じ手順を繰り返し、空き帯域が見つからなくなるまで繰り返す（繰り返し手順）。
図１の方法による場合、通信回線１回線（１６）のみを移動することにより、空き帯域１２を埋めることができるので、移動する通信回線数が少なく、再配置に時間をとられると言うことがない。
【００１１】
実施の形態２．
本実施の形態では、実施の形態１の図２のフローチャートのステップＳａ７において、空き帯域１２と帯域幅が一致する通信回線が見つからなかった場合の処置について説明する。図３は空き帯域の低帯域側に空き帯域と帯域幅が一致する通信回線は存在しないが、空き帯域より帯域幅が小さな通信回線は存在する場合の周波数の再配置を示した図である。図３において、初め通信回線２１，２３，２４，２５が割り当てられ、空き帯域２２、２６が存在する。空き帯域２２は通信回線２４と２５の合計分の帯域幅を持つと仮定する。
【００１２】
次に、図４のフローチャートについて動作を説明する。ステップＳａ１からＳａ８は実施の形態１の図２と同じであるので、説明は簡略に行う。利用可能な帯域の高い周波数端から空き帯域を検索し（Ｓａ２）、空き帯域２２を発見する（Ｓａ３）。発見した空き帯域２２より低い周波数側から、空き帯域２２と帯域幅が一致する通信回線を検索する（Ｓａ６）が、帯域幅が一致する通信回線は存在しない（Ｓａ７、Ｎ）ので、次に空き帯域２２より帯域幅が小さな通信回線を、空き帯域２２より低い周波数側について、低い周波数端から検索開始する（Ｓａ９、第４手順）。通信回線２５が見つかる。通信回線２５は空き帯域２２より帯域幅が小さい（Ｓａ１０）ので、空き帯域２２の中の高い周波数端に寄せて移動させる（Ｓａ１１、第５手順）。これによつて空き帯域２２の残り部分は空き帯域２６となって残る。
【００１３】
その後、再び高い周波数端から空き帯域を検索して（Ｓａ２）、空き帯域２６を発見し、またその帯域幅を調べる（Ｓａ３、第１手順）。空き帯域２６の低帯域側から２６と帯域幅が一致する通信回線を検索する（Ｓａ６、第２手順）。通信回線２４は空き帯域２６と帯域幅が一致する（Ｓａ７）ので、通信回線２４を空き帯域２６へ移動することにより、空き帯域を埋める（Ｓａ８、第３手順）。ここで説明した第１手順から第３手順の動作は実施の形態１のものと同じである。
本実施の形態の方法によれば、移動する通信回線と空き帯域の間に位置する通信回線を移動させることなく、空き帯域の周波数よりも低い周波数側の複数の通信回線を移動するだけで空き帯域を埋めていくことにより、再配置処理を行うことができるので、移動させる通信回線の数を少なくすることが出来る。
【００１４】
実施の形態３．
実施の形態１、２のいずれも実施できない場合、即ち、空き帯域の周波数よりも低い周波数側に、空き帯域と帯域幅が一致する通信回線が見つけられず、また、空き帯域より帯域幅が小さい通信回線も存在しない場合の周波数の再配置方法を図５により説明する。図５ａ）において、最初、通信回線３１，３３，３５，３６が割り当てられていて、空き帯域３２、３４が存在する。通信回線３６は空き帯域３２と３４の合計分の帯域幅を持つとする。
次に、図６のフローチャートについて動作を説明する。利用可能な帯域の高い周波数端から、低い周波数端へと空き帯域を検索（Ｓａ２）し、空き帯域３２を発見し、その帯域幅を調べる（Ｓａ３）。次に、低い周波数端から空き帯域３２と帯域幅が一致する通信回線を検索する（Ｓａ６）が、一致する通信回線は存在しない（Ｓａ７、Ｎ）ので、次に低い周波数端から空き帯域３２より帯域幅が小さな通信回線を検索する（Ｓａ９）。空き帯域３２より小さい通信回線も存在しない（Ｓａ１０、Ｎ）ときは、空き帯域３２の低い周波数側に隣接する通信回線３３を、空き帯域３２の中の高い周波数側に寄せて移動する（Ｓａ１２、第６手順）。これによって空き帯域３２と３４とが一体となって空き帯域３７が形成される。
【００１５】
その後、実施の形態１又は実施の形態２の手順を実行する。例えば、再び高い周波数端から空き帯域を検索し（Ｓａ２）、空き帯域３７を発見し、その帯域幅を測定する（Ｓａ３）。空き帯域３７にたいして、低い周波数端から、帯域幅が空き帯域３７の幅と一致する通信回線を検索する（Ｓａ６）。通信回線３６は空き帯域３７と帯域幅が一致する（Ｓａ７）ので、通信回線３６を空き帯域３７へ移動する（Ｓａ８）ことにより、空き帯域を埋める。
本実施の形態の方法によれば、空き帯域に隣接する低帯域側の通信回線を、空き帯域の高帯域側に移動することにより、より大きな空き帯域を作り出しているので、その後に実施の形態１又は２の方法を実行できるようになる。
【００１６】
実施の形態４．
実施の形態１〜３では、空き帯域の周波数より低い側の通信回線を、高い側へ移動する実施形態について説明した。勿論、通信回線の移動は高い周波数の側から低い周波数側へ移動することも可能である。このような実施の形態について以下に説明する。
図７は空き帯域の高帯域側に、空き帯域と帯域幅が一致する通信回線が存在する場合の周波数の再配置を示した図である。図４において、通信回線４１，４２，４３，４４，４６が割り当てられ、空き帯域４５が存在する。空き帯域４５と通信回線４１および４２は同様の帯域幅を持つとする。
【００１７】
次に、図８のフローチャートについて動作を説明する。再配置処理を開始する（Ｓｂ１）と、まず、利用可能な周波数帯域において、低帯域側から空き帯域を検索し（Ｓｂ２）、空き帯域４５を発見するとともにその帯域幅を調べる（Ｓｂ３）（ステップＳｂ２，Ｓｂ３は第７手順と言う）。次に、空き帯域４５と帯域幅が一致する通信回線を空き帯域４５の高帯域側から検索する。検索は高い周波数端から行う（Ｓｂ６、第８手順）。通信中の回線４１は空き帯域４５と帯域幅が一致する（Ｓｂ７）ので、通信回線４１を空き帯域４５に移動して（Ｓｂ８、第９手順）空き帯域を埋める。
通信回線１回線（４１）のみを移動することにより、空き帯域４５を埋めることができるので、移動する通信回線数が少なく、再配置に時間をとられると言うことがない。
【００１８】
実施の形態５．
高帯域の通信回線を、低帯域の空き帯域に移動する再配置であって、実施の形態４が実施できない場合について説明する。図９は空き帯域の高帯域側に空き帯域と帯域幅が一致する通信回線は存在しないが、空き帯域より帯域幅が小さな通信回線は存在する場合の周波数の再配置を示した図である。図９において、通信回線５１，５２，５３，５５が割り当てられ、空き帯域５４が存在する。空き帯域５４は通信回線５１と５２の合計分の帯域幅を持つとする。
次に、図１０のフローチャートについて動作を説明する。利用可能な帯域において、低帯域側から空き帯域を検索し（Ｓｂ２）、空き帯域５４を発見する（Ｓｂ３）。高帯域側から空き帯域５４と帯域幅が一致する通信回線を検索する（Ｓｂ６）が、帯域幅が一致する通信回線は存在しない（Ｓｂ７）ので、次に空き帯域５４より帯域幅が小さな通信回線を、高い周波数端から空き帯域５４までの間で検索する（Ｓｂ９、第１０手順）。通信回線５１は空き帯域５４より帯域幅が小さい（Ｓｂ１０）ので、空き帯域５４の低帯域側に移動する（Ｓｂ１１、第１１手順）。この結果、図９のｂ）図のように空き帯域５６が生じる。
そして実施の形態４を実行出来るようになる。即ち、再び低帯域側から空き帯域を検索し（Ｓｂ２）、空き帯域５６を発見する（Ｓｂ３）。空き帯域５６に対して、高帯域側から５６と帯域幅が一致する通信回線を検索する（Ｓｂ６）。通信回線５２は空き帯域５６と帯域幅が一致する（Ｓｂ７）ので、通信回線５２を空き帯域５６へ移動する（Ｓｂ８）ことにより、空き帯域を埋める。
【００１９】
実施の形態６．
実施の形態４、５のいずれも実施できない場合、即ち、空き帯域の高帯域側に空き帯域と帯域幅が一致する通信回線がない、また、空き帯域より帯域幅が小さい通信回線も存在しない場合の周波数の再配置方法を図１１により説明する。
図１１は空き帯域の高帯域側に空き帯域と帯域幅が一致、または空き帯域より帯域幅が小さい通信回線が存在しない場合の周波数の再配置を示した図である。
図１１において、通信回線６１、６２，６４，６６が割り当てられ、空き帯域６３，６５がある。通信回線６１は空き帯域６３と６５の合計分の帯域幅を持つとする。
【００２０】
次に、図１２のフローチャートについて動作を説明する。利用可能な帯域において、低帯域側から空き帯域を検索し（Ｓｂ２）、空き帯域６５を発見する（Ｓｂ３）。高帯域側から空き帯域６５と帯域幅が一致する通信回線を検索する（Ｓｂ６）が、帯域幅が一致する通信回線は存在しない（Ｓｂ７）ので、次に空き帯域６５より帯域幅が小さな通信回線を高帯域側から検索する（Ｓｂ９）。空き帯域６５より帯域幅が小さい通信回線も存在しない（Ｓｂ１０）ので、空き帯域６５に隣接する高帯域側の通信回線６４を、空き帯域６５の中の低い周波数側に寄せて移動する（Ｓｂ１２、第１２手順）。これにより空き帯域６３と６５とが一体化され空き帯域６７となる。こうして実施の形態４が実施できるようになる。
即ち、再び低帯域側から空き帯域を検索し（Ｓｂ２）、空き帯域６７を発見する（Ｓｂ３）。空き帯域６７に対して、高帯域側から帯域幅が一致する通信回線を検索する（Ｓｂ６）。通信回線６１は空き帯域６７と帯域幅が一致する（Ｓｂ７）ので、通信回線６１を空き帯域６７へ移動する（Ｓｂ８）ことにより、空き帯域を埋める。
【００２１】
実施の形態７．
実施の形態１〜６では、使用中の通信回線全てを移動の対象としている。しかし、移動させるときには短時間ではあるが見かけ上、通信速度の低下を招くなどの影響があるので、通信回線によっては通信途中で回線を移動したくない用途に使用されている場合もある。そこで、本実施の形態では、通信回線を移動の対象とする帯域（第１帯域と言う）と、移動の対象としない帯域（第２帯域と言う）に分けた場合の、周波数の再配置方法について説明する。
図１３において、通信回線７１，７２，７４，７５，７６，７７，７８が割り当てられ、空き帯域７３がある。空き帯域７３は通信回線７７と７８の合計分の帯域幅をもつとする。また線Ａは説明のための補助線である。
【００２２】
次に、動作について説明する。利用可能な帯域について、Ａより低帯域側の通信回線７７，７８を移動対象の通信回線とし、Ａより高帯域側の帯域の通信回線７１，７２，７４，７５，７６は移動しない回線とする。これを帯域分離手順という。この決定は前述のように使用目的などによって決定する。
周波数の高い側から空き帯域の検索を開始し、空き帯域７３を発見したとき、例えば実施の形態１では７３より低い側の通信回線を、順次、調べることになるが、本実施の形態では、移動対象である通信回線７７と７８のみを調べる。ここでは対象７７と７８の幅が７３の幅と一致するので、回線移動対象の通信回線７７及び７８を空き回線７３へ移動することによって、空き回線を埋める。
本実施の形態の方法では、再配置処理の対象となる帯域と、そうでない帯域とが最初から定めてあるので、移動対象となる通信回線が明確になり、移動対象を調べる時間が短縮され、また、余分な移動を減らすことができる。
【００２３】
実施の形態８．
実施の形態１〜３は低帯域から高帯域への移動、実施の形態４〜６は高帯域から低帯域へ移動するものについて説明した。空き帯域を低い周波数側に設けるか、高い周波数側に設けるかは、例えば、そのとき、いずれの周波数側の通信が効率がよいか（気象条件や電離層の状態により影響を受ける）などにより決定すればよいのであるが、どちらであっても通信効率には大差がないという場合に、再配置そのものを効率よく行うためにどちら方向の移動を行うかを決定する方法について説明する。
図１４は周波数の再配置を行う上で、通信回線の合計帯域幅を算出し、高帯域側及び低帯域側のどちら側に通信回線を移動するかを決定する方法を説明する図である。図１４において、Ｂを現在割り当てられている通信回線の合計帯域幅、Ｌ１〜Ｌ４は低帯域側の周波数端から周波数幅Ｂの中に含まれる通信回線、Ｈ１〜Ｈ８は高帯域側の周波数端から周波数幅Ｂに含まれる通信回線とする。
【００２４】
図１４の例では、Ｌ１〜Ｌ４、Ｈ１〜Ｈ８は、いずれも間に空き帯域を含んでいるから、周波数の幅Ｂの中に全通信回線が含まれると言うことはない。そして、高帯域側の幅Ｂに含まれる通信回線数をＮ１個，低帯域側の幅Ｂに含まれる通信回線数をＮ２個とする。この場合Ｎ１，Ｎ２は、それぞれ通信回線の密度を表しているということができる。
理解を助けるため、図１５のフローチャートについて動作を説明する。再配置処理を開始する（Ｓｃ１）と、利用可能な帯域について、通信回線の合計帯域幅Ｂを算出する （Ｓｃ２）。高帯域側から通信回線の合計帯域幅Ｂに含まれる通信回線Ｈ１〜Ｈ８の回線数（Ｎ１）及び、低帯域側から通信回線の合計帯域幅Ｂに含まれる通信回線ｌ１〜ｌ４の回線数（Ｎ２）を算出する（Ｓｃ３、第１３手順）。例えばＮ１＞Ｎ２となるとすると、高帯域側が密度が高いと言うことであるから、移動数を減らす為に再配置後の通信回線の移動先の帯域を高帯域側として、再配置処理を行う。
高帯域側と低帯域側とを比較して、通信回線が多く存在する方を再配置の移動先帯域とすることにより、移動する通信回線数を減らすことができる。
【００２５】
なお、実施の形態１と４において、第１手順と第７手順で、波数帯域の高い方の周波数端から、低い方の周波数端へと空き帯域を検索すると言うことは、一方の周波数端から他方の周波数端へと検索すると言うことも出来る。この表現をした場合、第２手順と第８手順で同じ帯域幅の通信回線を検索するのは周波数の前記他方の端から開始することとなる。
【００２６】
【発明の効果】
以上に説明したように、本発明の衛星回線の再配置制御方法によれば、通信回線１回線のみを移動することにより、空き帯域を埋めることができるので、移動させる通信回線の数を少なくすることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１による衛星回線の周波数再配置を示す図である。
【図２】図１の動作を説明するフローチャートである。
【図３】本発明の実施の形態２による衛星回線の周波数再配置を示す図である。
【図４】図３の動作を説明するフローチャートである。
【図５】本発明の実施の形態３による衛星回線の周波数再配置を示す図である。
【図６】図５の動作を説明するフローチャートである。
【図７】本発明の実施の形態４による衛星回線の周波数再配置を示す図である。
【図８】図７の動作を説明するフローチャートである。
【図９】本発明の実施の形態５による衛星回線の周波数再配置を示す図である。
【図１０】図９の動作を説明するフローチャートである。
【図１１】本発明の実施の形態６による衛星回線の周波数再配置を示す図である。
【図１２】図１１の動作を説明するフローチャートである。
【図１３】本発明の実施の形態７による衛星回線の周波数再配置を示す図である。
【図１４】本発明の実施の形態８による、周波数の再配置の移動先帯域を選択する方法を示す図である。
【図１５】図１４の周波数の再配置後の使用帯域を選択する方法を示すフローチャートである。
【図１６】衛星回線の周波数再配置を説明するための説明図である。
【符号の説明】
１２、２２、２５、３２、３４ 空き帯域、 １６ 移動させる通信回線、
４５、５４、６３，６５ 空き帯域、
Ｓａ２，Ｓａ３ 第１手順、 Ｓａ６ 第２手順、 Ｓａ８ 第３手順、
Ｓａ９ 第４手順、 Ｓａ１１ 第５手順、 Ｓａ１２ 第６手順、
Ｓｂ２，Ｓｂ３ 第７手順、 Ｓｂ６ 第８手順、
Ｓｂ８ 第９手順、 Ｓｂ９ 第１０手順、
Ｓｂ１１ 第１１手順、 Ｓｂ１２ 第１２手順。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a satellite link relocation control method in which a master station relocates frequencies to a communication link in a satellite link DAMA system of the SCPC-FDMA system.
[0002]
[Prior art]
Communication between ground stations, between communication satellites and ground stations, or between communication satellites is performed by wireless communication paths formed via communication satellites. In such communication, in most cases, a plurality of communication lines having different frequency bands are used, and a master station (usually a ground station but a satellite may have a master station) has a plurality of lines. In accordance with the state of use, the line is allocated each time communication is established with the slave station, and released at the end of communication. Such a scheme is called a demand-time channel allocation scheme (DAMA scheme, Demand Assignment Multiple Access), and is disclosed in, for example, Patent Document 1.
[0003]
Since the communication line of each band has a different frequency, there is naturally a difference in its characteristics. Therefore, in order to allocate to make use of the characteristics of each, or to prevent the efficient lines from becoming idle lines as much as possible, stop using the inefficient lines that are being used and replace the efficient lines. Assigning is extremely important. Such a line assignment is disclosed in Patent Document 2.
Changing the band once allocated in this way is called frequency rearrangement. In the following description, allocating a certain band to a different band by frequency rearrangement is referred to as band movement or simply movement.
[0004]
[Patent Document 1]
JP 2001-28563 A [Patent Document 2]
Japanese Patent Application Laid-Open No. Hei 8-9464
[Problems to be solved by the invention]
In the conventional frequency rearrangement method, all communication lines on the frequency band lower than the vacant band are moved, so it takes time to rearrange the frequency and requires a lot of processing. There was a problem that there was also a problem in sex.
[0006]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a stable system by quickly relocating frequencies by minimizing the number of moving communication lines. And
[0007]
[Means for Solving the Problems]
The satellite line relocation control method according to the present invention is characterized in that the master station assigns the wireless communication line to a frequency band having a frequency width capable of setting a plurality of wireless communication lines between a master station and a slave station via a satellite. In a satellite circuit of the line assignment on demand (DAMA) system for communication by
A first procedure of searching for an empty band from one frequency end to the other frequency end of the frequency band, and if there is an empty band, examining the bandwidth of this empty band;
A second step of searching for a communication line having a bandwidth that matches the bandwidth of the vacant band, from the other frequency end of the frequency band to the frequency of the vacant band,
A third procedure of moving the communication line with the matched bandwidth to the free bandwidth,
And a repetition procedure of repeating a series of procedures from the first procedure to the third procedure until the empty band cannot be searched in the first procedure.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Before describing the present invention, first, a basic operation of frequency relocation will be described. FIG. 16 is a frequency band distribution diagram in which the horizontal axis represents frequency. It is assumed that communication lines 81, 83, 84, 86, and 87 have been allocated by the master station as shown in FIG. Reference numerals 82 and 85 indicated by dotted lines indicate empty bands. When the master station wants to assign a higher frequency band, the communication line 83 on the lower frequency band side (this is also called the lower band side) than the empty band 82 in order to fill the empty bands 82 and 85. , 84, 86, and 87 are sequentially determined to determine whether there is a vacancy on the higher frequency side adjacent to the own band (this is also referred to as the higher band side), and if there is a vacancy, the operation is shifted to the higher frequency band side. Is sequentially performed for all the bands, and is repeatedly executed until there is no free space on the high frequency side for any band.
[0009]
That is, first, the band 82 and the communication line 83 are exchanged as shown in FIGS. A) to b), and then the communication line 84 and the band 82 are exchanged as shown in FIGS. B) to c). Next, the communication line 86 and the bands 82 and 85 are exchanged as shown in FIGS. Next, the communication line 87 and the bands 85 and 82 are exchanged as shown in FIGS. As a result, rearrangement is finally performed as shown in FIG. 16e), and empty bands 85 and 82 are provided at the lower frequency end. As described above, a number of stages of switching are required, so that the rearrangement takes time.
[0010]
Embodiment 1 FIG.
Hereinafter, a frequency relocation control method according to Embodiment 1 of the present invention will be described with reference to FIGS. Embodiment 1 describes a method of rearranging frequencies when there is a communication line having the same bandwidth as the vacant band at a frequency lower than the frequency of the vacant band. In FIG. 1, the abscissa represents the frequency. FIG. 1 a) shows the frequency before the reallocation, and FIG. 1 b) shows the frequency after the reallocation. In FIG. 1A, communication lines 11, 13, 14, 15, and 16 are allocated, and an empty band 12 is generated. It is assumed that the vacant band 12 and the communication line 16 have the same bandwidth.
Next, the operation will be described with reference to the flowchart of FIG. When the frequency rearrangement process is started (Sa1), first, an available band is searched for an available band from a high frequency end to a low frequency end (Sa2), and an empty band 12 is found first. At this time, the bandwidth of the vacant band 12 is checked simultaneously (Sa3) (Steps Sa2 and Sa3 are referred to as a first procedure). Next, if there is a communication line on the lower frequency side than the discovered free band 12 (Y of Sa4), communication starting from the lower frequency end and having a bandwidth equal to the free band 12 up to the free band 12 is performed. A line is searched (Sa6, second procedure). Since the communication line 16 has the same bandwidth as the vacant band 12 (Sa7), the communication line 16 is moved to the vacant band 12 to fill the vacant band (Sa8, third procedure).
Then, the same procedure is repeated from the first procedure again until no vacant band is found (repeated procedure).
In the case of the method of FIG. 1, by moving only one communication line (16), the vacant band 12 can be filled, so that the number of moving communication lines is small and time is required for relocation. Absent.
[0011]
Embodiment 2 FIG.
In the present embodiment, a description will be given of a process in a case where no communication line whose bandwidth matches the free band 12 is found in step Sa7 of the flowchart in FIG. 2 of the first embodiment. FIG. 3 is a diagram showing the rearrangement of frequencies when there is no communication line having the same bandwidth as the free band on the low band side of the free band, but there is a communication line having a smaller bandwidth than the free band. In FIG. 3, communication lines 21, 23, 24, and 25 are initially allocated, and free bands 22 and 26 exist. It is assumed that the free band 22 has a bandwidth corresponding to the sum of the communication lines 24 and 25.
[0012]
Next, the operation will be described with reference to the flowchart of FIG. Steps Sa1 to Sa8 are the same as those in FIG. 2 of the first embodiment, so that the description will be simplified. An empty band is searched from the frequency end of the usable band (Sa2), and an empty band 22 is found (Sa3). From the frequency side lower than the found free band 22, a search is made for a communication line whose bandwidth matches the free band 22 (Sa6), but there is no communication line whose bandwidth matches (Sa7, N). A search for a communication line having a smaller bandwidth than the band 22 is started from the lower frequency end on the lower frequency side than the vacant band 22 (Sa9, fourth procedure). Communication line 25 is found. Since the bandwidth of the communication line 25 is smaller than that of the vacant band 22 (Sa10), the communication line 25 is moved to a higher frequency end in the vacant band 22 (Sa11, fifth procedure). As a result, the remaining portion of the vacant band 22 remains as the vacant band 26.
[0013]
Thereafter, an empty band is searched again from the high frequency end (Sa2), and the empty band 26 is found, and its bandwidth is checked (Sa3, first procedure). A communication line whose bandwidth matches that of the free band 26 is searched from the low band side of the free band 26 (Sa6, second procedure). Since the communication line 24 has the same bandwidth as the vacant band 26 (Sa7), the vacant band is filled by moving the communication line 24 to the vacant band 26 (Sa8, third procedure). The operations in the first to third procedures described here are the same as those in the first embodiment.
According to the method of the present embodiment, the communication line located between the moving communication line and the vacant band is not moved, and the vacant state is obtained only by moving a plurality of communication lines on the frequency side lower than the vacant band frequency. By burying the band, the rearrangement process can be performed, so that the number of communication lines to be moved can be reduced.
[0014]
Embodiment 3 FIG.
When neither of Embodiments 1 and 2 can be implemented, that is, no communication line whose bandwidth matches the bandwidth is found on the frequency side lower than the frequency of the free bandwidth, and the bandwidth is smaller than the free bandwidth. A method for rearranging frequencies when there is no communication line will be described with reference to FIG. In FIG. 5A), communication lines 31, 33, 35 and 36 are initially allocated, and free bands 32 and 34 exist. It is assumed that the communication line 36 has a bandwidth corresponding to the sum of the free bands 32 and 34.
Next, the operation will be described with reference to the flowchart of FIG. An empty band is searched from the high frequency end of the usable band to the low frequency end (Sa2), the empty band 32 is found, and its bandwidth is examined (Sa3). Next, a search is made for a communication line whose bandwidth matches the vacant band 32 from the lower frequency end (Sa6), but there is no communication line that matches (Sa7, N). A communication line with a small bandwidth is searched (Sa9). When there is no communication line smaller than the vacant band 32 (Sa10, N), the communication line 33 adjacent to the lower frequency side of the vacant band 32 is moved toward the higher frequency side of the vacant band 32 (Sa12, Sa12). Sixth procedure). As a result, the vacant bands 32 and 34 are integrated to form the vacant band 37.
[0015]
After that, the procedure of the first embodiment or the second embodiment is executed. For example, an empty band is searched again from the high frequency end (Sa2), an empty band 37 is found, and the bandwidth is measured (Sa3). A communication line whose bandwidth matches the width of the vacant band 37 is searched from the lower frequency end of the vacant band 37 (Sa6). Since the communication line 36 has the same bandwidth as the vacant band 37 (Sa7), the vacant band is filled by moving the communication line 36 to the vacant band 37 (Sa8).
According to the method of the present embodiment, a larger vacant band is created by moving the communication line on the lower band side adjacent to the vacant band to the higher band side of the vacant band. The first or second method can be performed.
[0016]
Embodiment 4 FIG.
Embodiments 1 to 3 have described the embodiments in which the communication line on the lower side than the frequency of the free band is moved to the higher side. Of course, it is also possible to move the communication line from a higher frequency side to a lower frequency side. Such an embodiment will be described below.
FIG. 7 is a diagram showing the rearrangement of frequencies when there is a communication line having the same bandwidth as the free band on the high band side of the free band. In FIG. 4, communication lines 41, 42, 43, 44, 46 are allocated, and an empty band 45 exists. It is assumed that the vacant band 45 and the communication lines 41 and 42 have the same bandwidth.
[0017]
Next, the operation will be described with reference to the flowchart of FIG. When the rearrangement process is started (Sb1), first, in an available frequency band, a free band is searched from the low band side (Sb2), and a free band 45 is found and its bandwidth is checked (Sb3) (step) Sb2 and Sb3 are referred to as a seventh procedure). Next, a communication line whose bandwidth matches the vacant band 45 is searched from the higher band side of the vacant band 45. The search is performed from the higher frequency end (Sb6, eighth procedure). Since the communication line 41 has the same bandwidth as the vacant band 45 (Sb7), the communication line 41 is moved to the vacant band 45 (Sb8, ninth procedure) to fill the vacant band.
By moving only one communication line (41), the vacant band 45 can be filled, so that the number of moving communication lines is small, and it does not take much time to relocate.
[0018]
Embodiment 5 FIG.
A case will be described in which relocation is performed to move a high-bandwidth communication line to a low-bandwidth free band, and the fourth embodiment cannot be implemented. FIG. 9 is a diagram showing the rearrangement of frequencies when there is no communication line having the same bandwidth as the free band on the high band side of the free band, but there is a communication line having a smaller bandwidth than the free band. In FIG. 9, communication lines 51, 52, 53 and 55 are allocated, and an empty band 54 exists. It is assumed that the vacant band 54 has a bandwidth corresponding to the sum of the communication lines 51 and 52.
Next, the operation will be described with reference to the flowchart of FIG. The available bandwidth is searched for from the low bandwidth side (Sb2), and the available bandwidth 54 is found (Sb3). From the high band side, a communication line whose bandwidth matches that of the vacant band 54 is searched (Sb6), but there is no communication line whose bandwidth matches (Sb7). From the high frequency end to the empty band 54 (Sb9, tenth procedure). Since the communication line 51 has a smaller bandwidth than the vacant band 54 (Sb10), it moves to the lower band side of the vacant band 54 (Sb11, eleventh procedure). As a result, an empty band 56 is generated as shown in FIG.
Then, the fourth embodiment can be executed. That is, the free band is searched again from the low band side (Sb2), and the free band 56 is found (Sb3). With respect to the vacant band 56, a communication line having the same bandwidth as that of the vacant band 56 is searched (Sb6). Since the communication line 52 has the same bandwidth as the vacant band 56 (Sb7), the vacant band is filled by moving the communication line 52 to the vacant band 56 (Sb8).
[0019]
Embodiment 6 FIG.
When neither of Embodiments 4 and 5 can be performed, that is, when there is no communication line having the same bandwidth as the free band on the high band side of the free band, and there is no communication line having a bandwidth smaller than the free band. The method of rearranging the frequencies of the above will be described with reference to FIG.
FIG. 11 is a diagram showing the rearrangement of frequencies when there is no communication band whose bandwidth is equal to or higher than the free band on the higher band side of the free band, or where there is no communication line having a smaller bandwidth than the free band.
In FIG. 11, communication lines 61, 62, 64 and 66 are allocated, and free bands 63 and 65 are provided. It is assumed that the communication line 61 has a bandwidth corresponding to the sum of the vacant bands 63 and 65.
[0020]
Next, the operation will be described with reference to the flowchart of FIG. In the available band, a free band is searched from the low band side (Sb2), and a free band 65 is found (Sb3). From the high band side, a communication line having the same bandwidth as the vacant band 65 is searched (Sb6), but there is no communication line having the same bandwidth (Sb7). From the high band side (Sb9). Since there is no communication line whose bandwidth is smaller than the free band 65 (Sb10), the communication line 64 on the high band side adjacent to the free band 65 is moved to the lower frequency side of the free band 65 (Sb12, Twelfth procedure). As a result, the vacant bands 63 and 65 are integrated to form the vacant band 67. Thus, the fourth embodiment can be implemented.
That is, the free band is searched again from the low band side (Sb2), and the free band 67 is found (Sb3). With respect to the vacant band 67, a communication line whose bandwidth matches from the high band side is searched (Sb6). Since the communication line 61 has the same bandwidth as the free band 67 (Sb7), the free band is filled by moving the communication line 61 to the free band 67 (Sb8).
[0021]
Embodiment 7 FIG.
In the first to sixth embodiments, all communication lines in use are to be moved. However, when moving the communication line, although it takes a short time, the communication speed is apparently reduced, so that the communication line may be used for applications in which it is not desired to move the line during communication. Therefore, in the present embodiment, a frequency rearrangement method in a case where a communication line is divided into a band to be moved (referred to as a first band) and a band not to be moved (referred to as a second band). Will be described.
In FIG. 13, communication lines 71, 72, 74, 75, 76, 77, 78 are allocated, and there is a free band 73. The vacant band 73 has a bandwidth corresponding to the sum of the communication lines 77 and 78. Line A is an auxiliary line for explanation.
[0022]
Next, the operation will be described. Regarding available bands, communication lines 77, 78 on the lower band side than A are communication lines to be moved, and communication lines 71, 72, 74, 75, 76 on the higher band side than A are lines that do not move. . This is called a band separation procedure. This determination is determined according to the purpose of use as described above.
When the search for the free band is started from the higher frequency side and the free band 73 is found, for example, in the first embodiment, the communication lines on the lower side than 73 are sequentially examined, but in the present embodiment, Only the communication lines 77 and 78 to be moved are checked. Here, since the widths of the objects 77 and 78 match the widths of the lines 73, the communication lines 77 and 78 to be moved are moved to the empty lines 73 to fill the empty lines.
In the method of the present embodiment, the band to be rearranged and the band not to be rearranged are determined from the beginning, so that the communication line to be moved is clear, and the time to check the moved object is reduced, Also, extra movement can be reduced.
[0023]
Embodiment 8 FIG.
The first to third embodiments have described the movement from the low band to the high band, and the fourth to sixth embodiments have described the movement from the high band to the low band. Whether the vacant band is provided on the lower frequency side or on the higher frequency side is determined, for example, by which frequency side communication is more efficient (affected by weather conditions and ionospheric conditions). A method of determining which direction to move in order to efficiently perform the reallocation itself in the case where there is no significant difference in communication efficiency in any case will be described.
FIG. 14 is a diagram for explaining a method of calculating the total bandwidth of the communication line and determining which side of the high-band side or the low-band side to move the communication line in performing the frequency reallocation. In FIG. 14, B is the total bandwidth of the communication line currently assigned, L1 to L4 are the communication lines included in the frequency band B from the lower frequency end, and H1 to H8 are the higher frequency end. To a communication line included in the frequency width B.
[0024]
In the example of FIG. 14, since L1 to L4 and H1 to H8 each include an empty band, it is not necessarily said that all communication lines are included in the frequency width B. The number of communication lines included in the width B on the high band side is N1 and the number of communication lines included in the width B on the low band side is N2. In this case, it can be said that N1 and N2 each represent the density of the communication line.
The operation will be described with reference to the flowchart of FIG. 15 to facilitate understanding. When the rearrangement process is started (Sc1), the total bandwidth B of the communication line is calculated for the available band (Sc2). The number (N1) of communication lines H1 to H8 included in the total bandwidth B of the communication lines from the high band side, and the number of communication lines 11 to 14 included in the total bandwidth B of the communication lines from the low band side ( N2) is calculated (Sc3, thirteenth procedure). For example, if N1> N2, the higher band side has a higher density, so that the rearrangement processing is performed with the band of the destination of the communication line after the rearrangement set as the higher band side in order to reduce the number of moves.
By comparing the high band side and the low band side with the one having more communication lines as the relocation destination band, the number of moving communication lines can be reduced.
[0025]
In Embodiments 1 and 4, in the first and seventh procedures, searching for an empty band from the higher frequency end of the wavenumber band to the lower frequency end means that one of the frequency ends is searched for. It can be said that the search is performed to the other frequency end. In this case, searching for a communication line having the same bandwidth in the second and eighth procedures starts from the other end of the frequency.
[0026]
【The invention's effect】
As described above, according to the satellite line relocation control method of the present invention, the vacant band can be filled by moving only one communication line, so that the number of moved communication lines is reduced. be able to.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating frequency relocation of a satellite link according to Embodiment 1 of the present invention.
FIG. 2 is a flowchart illustrating the operation of FIG.
FIG. 3 is a diagram illustrating frequency relocation of a satellite link according to a second embodiment of the present invention.
FIG. 4 is a flowchart illustrating the operation of FIG. 3;
FIG. 5 is a diagram showing frequency relocation of a satellite link according to a third embodiment of the present invention.
FIG. 6 is a flowchart illustrating the operation of FIG.
FIG. 7 is a diagram showing frequency relocation of a satellite link according to a fourth embodiment of the present invention.
FIG. 8 is a flowchart illustrating the operation of FIG. 7;
FIG. 9 is a diagram showing frequency relocation of a satellite link according to a fifth embodiment of the present invention.
FIG. 10 is a flowchart illustrating the operation of FIG. 9;
FIG. 11 is a diagram illustrating frequency relocation of a satellite link according to Embodiment 6 of the present invention.
FIG. 12 is a flowchart illustrating the operation of FIG.
FIG. 13 is a diagram illustrating frequency relocation of a satellite link according to Embodiment 7 of the present invention.
FIG. 14 is a diagram illustrating a method of selecting a destination band for frequency relocation according to Embodiment 8 of the present invention.
FIG. 15 is a flowchart illustrating a method of selecting a used band after rearrangement of the frequencies in FIG. 14;
FIG. 16 is an explanatory diagram for explaining frequency relocation of a satellite link.
[Explanation of symbols]
12, 22, 25, 32, 34 available bandwidth, 16 communication lines to be moved,
45, 54, 63, 65 free bandwidth,
Sa2, Sa3 first procedure, Sa6 second procedure, Sa8 third procedure,
Sa9 fourth procedure, Sa11 fifth procedure, Sa12 sixth procedure,
Sb2, Sb3 seventh procedure, Sb6 eighth procedure,
Sb8 ninth procedure, Sb9 tenth procedure,
Sb11 eleventh procedure, Sb12 twelfth procedure.

Claims (9)

衛星を介して親局と子局間で、複数の無線通信回線を設定可能な周波数幅を有する周波数帯域に前記無線通信回線を親局が割り当てることにより通信を行う要求時回線割当（ＤＡＭＡ）方式の衛星回線において、
前記周波数帯域の、一方の周波数端から他方の周波数端へと空き帯域を検索し、空き帯域があれば、この空き帯域の帯域幅を調べる第１手順、
前記空き帯域の帯域幅と一致する帯域幅を有する通信回線を、前記周波数帯域の前記他方の周波数端から前記空き帯域の周波数まで検索する第２手順、
前記帯域幅が一致した通信回線を前記空き帯域へと移動する第３手順、
前記第１手順から前記第３手順に至る一連の手順を、前記第１手順において前記空き帯域が検索できなくなるまで繰り返す繰り返し手順とを含むことを特徴とする衛星回線の再配置制御方法。A demand line assignment (DAMA) system in which a master station allocates a plurality of wireless communication lines to a frequency band having a frequency width capable of setting a plurality of wireless communication lines between the master station and the slave station via a satellite to perform communication. In the satellite line of
A first procedure of searching for an empty band from one frequency end to the other frequency end of the frequency band, and if there is an empty band, examining the bandwidth of this empty band;
A second step of searching for a communication line having a bandwidth that matches the bandwidth of the vacant band from the other frequency end of the frequency band to the frequency of the vacant band;
A third procedure for moving the communication line with the matched bandwidth to the free bandwidth,
A repetition procedure for repeating a series of procedures from the first procedure to the third procedure until the empty band cannot be searched in the first procedure. 衛星を介して親局と子局間で、複数の無線通信回線を設定可能な周波数幅を有する周波数帯域に前記無線通信回線を親局が割り当てることにより通信を行う要求時回線割当（ＤＡＭＡ）方式の衛星回線において、
前記周波数帯域の、高い周波数端から低い周波数端へと空き帯域を検索し、空き帯域があれば、この空き帯域の帯域幅を調べる第１手順、
前記空き帯域の帯域幅と帯域幅が一致する通信回線を、前記周波数帯域の低い周波数端から前記空き帯域の周波数まで検索する第２手順、
前記帯域幅が一致した通信回線を前記空き帯域へと移動する第３手順、
前記第１手順から前記第３手順に至る一連の手順を、前記第１手順において前記空き帯域が検索できなくなるまで繰り返す繰り返し手順とを含むことを特徴とする衛星回線の再配置制御方法。A demand line assignment (DAMA) system in which a master station allocates a plurality of wireless communication lines to a frequency band having a frequency width capable of setting a plurality of wireless communication lines between the master station and the slave station via a satellite to perform communication. In the satellite line of
A first procedure of searching for an empty band from a higher frequency end to a lower frequency end of the frequency band and, if there is an empty band, examining the bandwidth of the empty band;
A second step of searching for a communication line whose bandwidth matches the bandwidth of the vacant band, from a low frequency end of the frequency band to a frequency of the vacant band,
A third procedure of moving the communication line with the matched bandwidth to the free bandwidth,
A repetition procedure for repeating a series of procedures from the first procedure to the third procedure until the empty band cannot be searched in the first procedure. 前記第２手順において、帯域幅が一致する通信回線が検索出来なかったとき、
前記空き帯域の帯域幅より小さい帯域幅を有する通信回線を、前記周波数帯域の低い周波数端から前記空き帯域の周波数まで検索する第４の手順、
前記帯域幅がより小さい通信回線を、前記空き帯域の中の高周波数端へ移動する第５の手順を含むことを特徴とする請求項２に記載の衛星回線の再配置制御方法。In the second procedure, when a communication line having the same bandwidth cannot be searched,
A fourth procedure for searching for a communication line having a bandwidth smaller than the bandwidth of the vacant band from a low frequency end of the frequency band to a frequency of the vacant band,
The method according to claim 2, further comprising a fifth step of moving the communication line having the smaller bandwidth to a high frequency end in the free band. 前記第４手順において、前記空き帯域の帯域幅より小さな帯域幅を有する通信回線が検索できなかったとき、
前記空き帯域の低周波数側に隣接する通信回線を、前記空き帯域の中の高い周波数端へ移動する第６手順を含むことを特徴とする請求項３に記載の衛星回線の再配置制御方法。In the fourth procedure, when a communication line having a bandwidth smaller than the bandwidth of the free bandwidth cannot be searched,
The method according to claim 3, further comprising a sixth step of moving a communication line adjacent to a lower frequency side of the vacant band to a higher frequency end of the vacant band. 衛星を介して親局と子局間で、複数の無線通信回線を設定可能な周波数幅を有する周波数帯域に、前記無線通信回線を親局が割り当てることにより通信を行う要求時回線割当（ＤＡＭＡ）方式の衛星回線において、
前記周波数帯域の、低い周波数端から高い周波数端へと空き帯域を検索し、空き帯域があれば、この空き帯域の帯域幅を調べる第７手順、
前記空き帯域の帯域幅と一致する帯域幅を有する通信回線を、前記周波数帯域の高い周波数端から前記空き帯域の周波数まで検索する第８手順、
前記帯域幅が一致した通信回線を前記空き帯域へと移動する第９手順、
前記第７手順から前記第９手順に至る一連の手順を、前記第７手順において前記空き帯域が検索できなくなるまで繰り返す繰り返し手順とを含むことを特徴とする衛星回線の再配置制御方法。On demand channel assignment (DAMA) for performing communication by assigning the wireless communication line to the master station and a slave station via a satellite by assigning the wireless communication line to a frequency band having a frequency width capable of setting a plurality of wireless communication lines. System satellite links,
A seventh procedure of searching for an empty band from a lower frequency end to a higher frequency end of the frequency band, and if there is an empty band, examining the bandwidth of this empty band;
An eighth procedure of searching for a communication line having a bandwidth that matches the bandwidth of the vacant band from a high frequency end of the frequency band to a frequency of the vacant band,
A ninth procedure for moving the communication line with the matched bandwidth to the free bandwidth,
A repetition procedure for repeating a series of procedures from the seventh procedure to the ninth procedure until the empty band cannot be searched in the seventh procedure. 前記第８手順において、帯域幅が一致する通信回線が検索出来なかったとき、
前記空き帯域の帯域幅より小さい帯域幅を有する通信回線を、高い周波数端から前記空き帯域の周波数まで検索する第１０の手順、
前記帯域幅がより小さい通信回線を前記空き帯域の中の低周波数端へ移動する第１１の手順を含むことを特徴とする請求項５に記載の衛星回線の再配置制御方法。In the eighth procedure, when a communication line having the same bandwidth cannot be searched,
A tenth procedure for searching for a communication line having a bandwidth smaller than the bandwidth of the vacant band from a high frequency end to a frequency of the vacant band,
The method according to claim 5, further comprising an eleventh step of moving the communication line having the smaller bandwidth to a lower frequency end in the vacant band. 前記第１０手順において、帯域幅が前記空き帯域の帯域幅より小さな通信回線が検索できなかったとき、
前記空き帯域の高周波数側に隣接する通信回線を、前記空き帯域の中の低い周波数端へ移動する第１２手順を含むことを特徴とする請求項６に記載の衛星回線の再配置制御方法。In the tenth procedure, when a communication line whose bandwidth is smaller than the bandwidth of the vacant band cannot be searched,
7. The method according to claim 6, further comprising a twelfth step of moving a communication line adjacent to the high frequency side of the vacant band to a lower frequency end of the vacant band. 前記周波数帯域を、周波数再配置の対象とする第１帯域と、周波数再配置の対象としない第２帯域に分離する帯域分離手順を含み、
前記第１手順又は前記第７手順は、前記第１帯域内において実行し、
前記第２手順又は前記第４手順又は前記第８手順又は前記第１０手順は前記第２帯域内において実行することを特徴とする請求項１、２、３、５、６のいずれか一項に記載の衛星回線の再配置制御方法。A band separation procedure for separating the frequency band into a first band to be subjected to frequency rearrangement and a second band not to be subjected to frequency rearrangement;
Performing the first procedure or the seventh procedure in the first band;
The method according to any one of claims 1, 2, 3, 5, and 6, wherein the second procedure, the fourth procedure, the eighth procedure, or the tenth procedure is performed in the second band. The relocation control method of the satellite line described in the above. 割り当てている通信回線の合計帯域幅Ｗを算出する第１１手順、
前記周波数帯域の高い周波数端から周波数幅Ｗの帯域Ｈにおける通信回線密度と、低い周波数端から周波数幅Ｗの帯域Ｌにおける通信回線密度とを測定する第１３手順を含み、
前記第１手順または前記第７手順は、前記帯域Ｈ，Ｌの内、前記通信回線密度の高い方の帯域において実行し、前記第２手順、又は第４手順、又は第８手順、又は第１０手順は前記通信回線密度の低い方の帯域において実行することにより、移動させる通信回線の数を低減するようにしたことを特徴とする請求項１、２，３，５，６のいずれか一項に記載の衛星回線の再配置制御方法。An eleventh procedure for calculating the total bandwidth W of the allocated communication lines,
A thirteenth step of measuring a communication line density in a band H having a frequency width W from a high frequency end of the frequency band and a communication line density in a band L having a frequency width W from the low frequency end;
The first procedure or the seventh procedure is executed in the higher bandwidth of the communication line density among the bandwidths H and L, and the second procedure, the fourth procedure, the eighth procedure, or the tenth procedure is executed. The method according to any one of claims 1, 2, 3, 5, and 6, wherein the number of communication lines to be moved is reduced by executing the procedure in the band having the lower communication line density. 3. A method for controlling the rearrangement of a satellite line according to item 1.
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
JP2006245958A (en) * 2005-03-02 2006-09-14 Ntt Docomo Inc Transmission apparatus and transmission control method
JP2008252609A (en) * 2007-03-30 2008-10-16 Mitsubishi Electric Corp Satellite communication method, slave station, and master station

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006245958A (en) * 2005-03-02 2006-09-14 Ntt Docomo Inc Transmission apparatus and transmission control method
JP4526977B2 (en) * 2005-03-02 2010-08-18 株式会社エヌ・ティ・ティ・ドコモ Transmitter and transmission control method
JP2008252609A (en) * 2007-03-30 2008-10-16 Mitsubishi Electric Corp Satellite communication method, slave station, and master station

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