JP2004260465A

JP2004260465A - Wireless communication system, wireless communication terminal, central management server, and communication path setting method

Info

Publication number: JP2004260465A
Application number: JP2003048006A
Authority: JP
Inventors: Tomohiro Nakagawa; 智尋中川; Masaru Ota; 賢太田; Takashi Yoshikawa; 貴吉川; Masaharu Kurakake; 正治倉掛
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2003-02-25
Filing date: 2003-02-25
Publication date: 2004-09-16

Abstract

【課題】経路を設定するための経路情報の量を削減し、通信帯域と電力の浪費を防止する。また、経路を設定する際に端末の残余電力を考慮し、残余電力の多い端末を優先的に中継する経路を構築する。
【解決手段】無線通信システムＭ１は、集中管理サーバ１および複数の無線通信端末２Ａ〜２Ｇを備えている。集中管理サーバ１には、無線通信端末２から隣接端末情報および残余電力情報が送信される。集中管理サーバ１は、隣接端末情報および残余電力情報に基づいて、通信経路を計算する。算出された通信経路は、複数の無線通信端末２Ａ〜２Ｇに次々と転送され、それぞれの無線通信端末２Ａ〜２Ｇに記録される。
【選択図】図１An object of the present invention is to reduce the amount of route information for setting a route and prevent waste of communication bandwidth and power. In addition, when setting the route, the remaining power of the terminal is taken into consideration, and a route for relaying the terminal having higher remaining power preferentially is constructed.
A wireless communication system includes a centralized management server and a plurality of wireless communication terminals. Adjacent terminal information and residual power information are transmitted from the wireless communication terminal 2 to the central management server 1. The central management server 1 calculates a communication path based on the adjacent terminal information and the remaining power information. The calculated communication path is sequentially transferred to the plurality of wireless communication terminals 2A to 2G, and is recorded in each of the wireless communication terminals 2A to 2G.
[Selection diagram] Fig. 1

Description

【０００１】
【発明の属する技術分野】
本発明は、無線通信システム、特に、無線中継型通信システムである自律分散型無線ネットワーク、およびこれに用いる無線通信端末、集中管理サーバ、および通信経路設定方法に関する。
【０００２】
【従来の技術】
無線通信端末が集合することによって形成される無線中継型通信には、自律分散型無線ネットワーク（以下「アドホックネットワーク」という）がある。このアドホックネットワークでは、データが転送される経路があらかじめ設定されていない方式が採用されているので、ネットワーク内全体にデータを転送するための通信帯域と端末の電力の消費量が多くなる傾向にある。これらの通信帯域や電力の消費量を削減するには、転送する無線通信端末（中継端末）の経路制御が重要となる。
【０００３】
このアドホックネットワークにおける経路制御として、従来、たとえば特開２０００−２５２９９２号公報に開示されているものがある。この公報に開示されたアドホックネットワークでは、使用できなくなった通信ルートの柱係数を生存期間として規定し、それにマージンを加えたブロードキャスト送信される範囲を、ルート再構築を行う対象となる端末の周辺までに限定するようにしている。このため、無駄な制御パケットのブロードキャスト送信によるトラフィックを減少させるようにしている。
【０００４】
【特許文献１】
特開２０００−２５２９９２号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、上記特許文献１に開示された中継端末の決定方法では、個々の端末が保持する経路情報を隣接する端末へ次々と転送することで経路情報を相互に伝達する点に変わりはない。したがって、発信元の端末数とネットワークを構成する端末数の乗数に比例した膨大な量の経路情報が発信されるので、通信帯域および端末の消費電力を浪費する問題は依然として残るものであった。
【０００６】
そこで、本発明の課題は、経路を設定するための経路情報の量を削減し、通信帯域と電力の浪費を防止し、さらには、経路を設定する際に端末の残余電力を考慮し、残余電力の多い端末を優先的に中継する経路を構築することにある。
【０００７】
【課題を解決するための手段】
上記課題を解決した本発明に係る無線通信システムは、データの送受信機能および中継機能をそれぞれ備える複数の無線通信端末の間で、無線リンクを介してデータの無線通信が可能とされた自律分散型の無線通信システムにおいて、複数の無線通信端末のうちの少なくとも一つと無線通信可能な集中管理サーバが設けられ、各無線通信端末が、無線リンクを介して隣接する端末を記録する隣接端末記録部と、データの転送先を示す経路情報を記録する経路情報記録部と、をそれぞれ有し、集中管理サーバが、無線通信端末から送信された隣接端末の情報を蓄積する接続形態記憶部と、各隣接端末の接続形態に基づいて通信経路を計算する経路情報計算部と、を有する、ものである。
【０００８】
本発明に係る無線通信システムでは、無線通信端末と通信可能な集中管理サーバを設け、この集中管理サーバに、各無線通信端末から得た隣接端末情報を蓄積する接続形態記録部と、蓄積された接続形態から通信経路を計算する経路情報計算部とを備えている。この経路情報計算部において、各無線通信端末の隣接端末に基づいて通信経路を計算することにより、経路を設定するための経路情報の量を削減し、通信帯域と電力の浪費を防止することができる。
【０００９】
ここで、無線通信端末が、無線通信端末の残余電力を監視する残余電力監視部をさらに有し、集中管理サーバが、無線通信端末から通知された残余電力を記録する残余電力記録部をさらに有するとともに、集中管理サーバにおける経路情報計算部は、各無線通信端末の接続形態および無線通信端末の残余電力に基づいて通信経路を計算する態様とするのが好適である。
【００１０】
本発明では、集中管理サーバにおいて、残余電力をも考慮して通信経路を算出している。このため、残余電力の少ない無線通信端末を避けるなどする通信経路とすることができるので、確実な通信経路を確保することができる。
【００１１】
また、上記の無線通信システムに用いる無線通信端末は、請求項１に記載の無線通信システムに用いられる無線通信端末であって、集中管理サーバまたは無線通信端末が発信する隣接端末を把握するための制御情報を転送し、制御情報に基づいて把握した隣接する集中管理サーバまたは無線通信端末を、隣接端末記録部に記録するものである。
【００１２】
また、残余電力を監視する残余電力監視部をさらに有し、残余電力監視部で監視する残余電力を集中管理サーバに通知する態様とすることができる。
【００１３】
さらに、集中管理サーバから発信された転送先を示す経路情報を無線通信端末で順次転送し、経路情報を経路情報記録部に記録する態様とすることもできる。
【００１４】
これらの態様の無線通信端末を本発明の無線通信システムに用いることができる。
【００１５】
また、上記の無線通信システムに用いられる集中管理サーバは、無線通信端末から収集した隣接端末の情報に基づいて無線通信端末の接続形態を計算し、算出された接続形態の情報を接続形態記録部に記録するものである。
【００１６】
ここで、接続形態記録部に記録された無線通信システムの接続形態に基づいて、経路情報計算部においてデータの転送先を示す経路情報を計算し、算出された経路情報を無線通信端末に通知する態様とするのが好適である。
【００１７】
さらに、無線通信端末から収集した隣接端末の情報に基づいて前記無線通信端末の接続形態を計算し、算出された前記接続形態の情報を接続形態記録部に記録し、前記無線通信端末から通知された残余電力を各無線通信端末毎に残余電力記録部に記録する態様とすることもできる。
【００１８】
このとき、接続形態記録部に記録された無線通信システムの接続形態および残余電力記録部に記録された無線通信端末の残余電力に基づいて、経路情報計算部においてデータの転送先を示す経路情報を計算し、算出された経路情報を無線通信端末に通知する態様とするのが好適である。
【００１９】
これらの集中管理サーバを上記無線通信システムに用いることができる。
【００２０】
他方、上記課題を解決した本発明に係る通信経路設定方法は、データの送受信機能および中継機能をそれぞれ備える複数の無線通信端末の間で、無線リンクを介してデータの無線通信が可能とされた自律分散型の無線通信システムにおける無線リンクの経路を設定する通信経路設定方法であって、無線通信システムには、複数の無線通信端末のうちの少なくとも一つと無線通信可能な集中管理サーバが設けられており、無線通信端末が隣接する集中管理サーバまたは無線通信端末を隣接端末記録部に記録する隣接端末記録ステップと、無線通信端末が隣接端末記録部に記録された隣接端末情報を集中管理サーバに通知する隣接端末通知ステップと、集中管理サーバが無線通信端末から通知された隣接端末の情報に基づいて、各無線通信端末の接続形態を計算し、接続形態記録部に記録する接続形態計算ステップと、集中管理サーバの経路情報計算部において、接続形態記録部に記録された各無線通信端末の接続形態に基づいて、無線通信端末への無線通信の経路情報を計算する経路計算ステップと、集中管理サーバが経路情報計算部において計算した経路情報を無線通信端末へと通知する経路情報通知ステップと、を含むことを特徴とする。
【００２１】
さらに、隣接端末通知ステップにおいて、無線通信端末が隣接端末の情報とともに残余電力記録部に記録された各無線通信端末の残余電力を集中管理サーバに通知し、経路計算ステップにおいて、各無線通信端末の接続形態と、各部船通信端末の余剰電力に基づいて、経路情報を計算する態様とするのが好適である。
【００２２】
【発明の実施の形態】
以下、本発明の実施の形態を、図面を参照しながら具体的に説明する。
【００２３】
図１は、本発明の第１の実施形態に係る無線通信システムの構成図である。図１に示すように、本実施形態に係る無線通信システムＭ１は、アドホックネットワークを構成する通信システムであり、集中管理サーバ１と、複数、本実施形態では７つの無線通信端末２Ａ〜２Ｇによって構成され、各集中管理サーバ１と各無線通信端末２Ａ〜２Ｇとは無線通信が可能とされている。なお、本実施形態では、説明の便宜上、無線通信端末を７つとしているが、多数の無線通信端末間で無線通信システムを構築することも、もちろん可能である。
【００２４】
各無線通信端末２Ａ〜２Ｇのうち、第１無線通信端末２Ａおよび第２無線通信端末２Ｂは、集中管理サーバ１と直接無線通信が可能とされており、他の無線通信端末２Ｃ〜２Ｇは、自分以外の無線通信端末２Ａ〜２Ｇ等を介して集中管理サーバ１と無線通信が可能とされている。たとえば、第３無線通信端末２Ｃは、第１無線通信端末２Ａまたは第２無線通信端末２Ｂを介して集中管理サーバ１と無線通信が可能とされ、第７無線通信端末２Ｇは、第４無線通信端末２Ｄおよび第２無線通信端末２Ｂ等を介して集中管理サーバ１と無線通信可能とされている。したがって、各無線通信端末２Ａ〜２Ｇは、制御情報やデータの送受信を行うほか、制御情報やデータの中継端末としても機能する。
【００２５】
次に、本実施形態に係る無線通信システムにおける集中管理サーバ１について説明する。図２は、本実施形態に係る集中管理サーバのブロック構成図である。図２に示すように、本実施形態に係る集中管理サーバ１は、無線通信部１１を備えている。無線通信部１１は、無線通信端末２Ａ、２Ｂとの間におけるデータの送受信を行う機能を有しており、無線通信端末２Ａ，２Ｂから送信されたデータを受信し、または自ら作成したデータを無線通信端末２Ａ，２Ｂに送信する。この無線通信部１１は、中央処理部１２に接続されており、中央処理部１２の指令に基づいて、無線通信端末２Ａ、２Ｂ等との無線通信を行う。
【００２６】
中央処理部１２には、無線通信部１１のほか、経路情報計算部１３、接続形態記録部１４、および残余電力記録部１５が接続されている。
【００２７】
経路情報計算部１３では、接続形態記録部１４および残余電力記録部１５に記録された接続形態および各無線通信端末２Ａ〜２Ｇの残余電力などの情報に基づいて、無線通信端末２Ａ〜２Ｇを中継する通信経路を計算する。
【００２８】
また、接続形態記録部１４には、無線通信端末２Ａ〜２Ｇから送信された各無線通信端末２Ａ〜２Ｇにおける隣接端末が接続形態情報として記録される。さらに残余電力記録部１５には、各無線通信端末２Ａ〜２Ｇから送信された残余電力情報が記録される。接続形態記録部１４および残余電力記録部１５は、記憶している接続形態情報および残余電力情報を、経路情報計算部１３にそれぞれ出力している。
【００２９】
続いて、本実施形態に係る無線通信端末の構成について説明する。本実施形態に係る無線通信端末２Ａ〜２Ｇは、いずれも同一の構成を有している。図３は、本実施形態に係る無線通信端末の構成を示すブロック構成図である。図３に示すように、本実施形態に係る無線通信端末２は、無線通信部２１を備えている。無線通信部２１は、集中管理サーバ１や自分以外の無線通信端末２Ａ〜２Ｇとの間におけるデータの送受信を行う機能を有しており、集中管理サーバ１や自分以外の無線通信端末２Ａ〜２Ｇから送信されたデータを受信し、または自ら作成したデータを集中管理サーバ１や自分以外の無線通信端末２Ａ〜２Ｇに送信する。さらに、無線通信部２１は、中央処理部２２に接続されており、中央処理部２２の指令に基づいて、集中管理サーバ１や無線通信端末２Ａ〜２Ｇのうち、自分以外の無線通信端末との無線通信を行う。
【００３０】
中央処理部２２には、無線通信部２１のほか、隣接端末記録部２３、経路情報記録部２４、および残余電力監視部２５が接続されている。
【００３１】
隣接端末記録部２３は、無線通信端末２，２間で定期的あるいは不定期的に転送される制御情報あるいはデータを監視することにより、無線通信端末２Ａ〜２Ｇのうち、無線リンクＬを介して隣接する端末が無線通信端末２Ａ〜２Ｇのうちのどの無線通信端末であるかまたは集中管理サーバ１であるかを記録する。
【００３２】
たとえば、図１に示す例では、第１無線通信端末２Ａの隣接端末は集中管理サーバ１および第３無線通信端末２Ｃであり、第２無線通信端末２Ｂの隣接端末は、集中管理サーバ１、第３無線通信端末２Ｃ、第４無線通信端末２Ｄ、および第５無線通信端末２Ｅである。また、隣接端末は、データの送信元である無線通信端末２Ａ〜２Ｇのいずれかの無線通信端末または集中管理サーバ１であるので、データの送信元を特定することにより、隣接端末の把握を行うことができる。また、無線通信端末２は、記録された隣接端末情報を集中管理サーバ１に直接的または間接的に通知している。
【００３３】
経路情報記録部２４は、集中管理サーバ１から通知された通信経路情報を記録している。無線通信端末２は、この通信経路情報に基づいて制御情報やデータの転送先を決定している。
【００３４】
残余電力監視部２５は、図示しない自らの蓄電器に残余する電力を監視している。また、無線通信端末２では、無線通信部２１を介して、残余電力監視部２５で監視している残余電力情報を集中管理サーバ１に直接的または間接的に通知している。
【００３５】
次に、本実施形態に係る無線通信システムの動作および無線通信システムにおける通信経路の設定方法について説明する。図４は、本実施形態に係る無線通信システムにおける通信経路の計算の手順を示すフローである。図４に示すように、無線通信端末２の隣接端末記録部２３は、自分の隣接端末が無線通信端末２Ａ〜２Ｇのうちのどの無線通信端末であるかまたは集中管理サーバ１であるかの情報を集中管理サーバ１に直接的または間接的に通知する。集中管理サーバ１では、送信された隣接端末情報を無線通信部１１で受信し、接続形態記録部１４に出力する（Ｓ１）。接続形態記録部１４では、出力された隣接端末情報を蓄積する。
【００３６】
ところで、集中管理サーバ１では、隣接端末情報の通知を依頼する制御情報を各無線情報端末２Ａ〜２Ｇに直接的または間接的に随時送信している。この制御情報は、無線通信端末２Ａ〜２Ｇを介して順次各無線通信端末２Ａ〜２Ｇに転送されるが、制御情報の転送は隣接端末から行われている。したがって、この制御情報を転送する際に、各無線通信端末２Ａ〜２Ｇは、各々の隣接端末情報を取得することができ、その隣接端末情報を隣接端末記録部２３に記録しておく。
【００３７】
また、隣接端末記録部２３において、制御情報の転送回数に上限を設定しておき、転送回数を制御情報内に記録しながらその上限値に達するまで隣接情報を転送する。こうして、各無線通信端末２Ａ〜２Ｇにおける隣接端末情報を取得することができる。各無線通信端末２Ａ〜２Ｇでは、制御情報を転送する際の逆の順番で各無線通信端末２Ａ〜２Ｇが隣接端末記録部２３の情報を周囲の無線通信端末２Ａ〜２Ｇに発信する。以後、隣接端末情報は、制御情報を転送する際の逆の順番で集中管理サーバ１に送信される。
【００３８】
一方、無線通信端末２Ａ〜２Ｇにおける残余電力監視部２５では、それぞれの無線通信端末２Ａ〜２Ｇにおける蓄電器の残余電力をそれぞれ監視している。各無線通信端末２Ａ〜２Ｇは、監視している残余電力情報を集中管理サーバ１に直接的または間接的に通知している。残余電力情報は、たとえば隣接端末情報を集中管理サーバ１に送信する際に、同時に送信する態様とすることができる。集中管理サーバ１では、受信した各無線通信端末２Ａ〜２Ｇにおける残余電力情報を残余電力記録部１５に出力している（Ｓ２）。残余電力記録部１５は、出力された各無線通信端末２Ａ〜２Ｇのそれぞれの残余電力情報を記録する。
【００３９】
ここで、集中管理サーバ１においては、接続形態記録部１４に隣接端末情報が蓄積され、残余電力記録部１５に残余電力情報が記録されている。これらの隣接端末情報および残余電力情報は、それぞれ接続形態記録部１４および残余電力記録部１５から経路情報計算部１３に出力される（Ｓ３，Ｓ４）。経路情報計算部１３では、これらの隣接端末情報および残余電力情報に基づいて通信経路を計算する。通信経路の計算を行う際には、隣接端末情報および残余電力情報が利用されるが、隣接端末情報のみから計算することができ、あるいは隣接端末情報および残余電力情報から計算することができる。具体的には、まず隣接端末情報に基づいて、各無線情報端末２Ａ〜２Ｇに情報を送信するための最短経路を提供する通信経路を計算する。この最短経路を提供する通信経路である最短通信経路を通信経路とすることができる。また、残余電力情報を用いる場合には、各無線通信端末２Ａ〜２Ｇにおける残余電力情報を参照し、たとえば残余電力が所定のしきい値を下回るほどに減少している無線通信端末があったとする。この場合には、残余電力が乏しい無線通信端末への無線通信リンクを経路の候補から排除し、最短通信経路を通信経路とすることができる。
【００４０】
このようにして、経路情報計算部１３で通信経路を計算したら、算出された通信経路を無線通信部１１に出力する。集中管理サーバ１は、無線通信部１１を介して算出した通信経路を各無線通信端末２Ａ〜２Ｇに直接的または間接的に出力する。集中管理サーバ１からは、まず隣接端末である第１，第２無線通信端末２Ａ，２Ｂに通信経路情報が通知される。第１，第２無線通信端末２Ａ，２Ｂでは、通知された通信経路情報を無線通信部２１で受信し、無線通信部２１から経路情報記録部２４に出力し（Ｓ５）、経路情報記録部２４に記録する。無線通信端末２Ａ，２Ｂでは、経路情報記録部２４に記録された通信経路情報に基づいて、情報やデータを転送する端末を決定する。
【００４１】
また、第１，第２無線通信端末２Ａ，２Ｂでは、無線通信部２１から経路情報記録部２４に通信経路情報を出力する一方、経路情報記録部２４に記録された通信経路情報に基づいて、通知された通信経路情報を次の隣接端末となる第３〜第５無線通信端末２Ｃ〜２Ｅ等に転送する。通信経路情報が転送された無線通信端末２Ｃ〜２Ｅでは、第１，第２無線通信端末２Ａ，２Ｂと同様に、通信経路情報を無線通信部２１から経路情報記録部２４に出力し、経路情報記録部２４に記録する。それとともに、経路情報記録部２４に記録された経路情報に基づいて、隣接端末となる第６，第７無線通信端末２Ｆ，２Ｇに通信経路情報をさらに転送する。
【００４２】
このようにして、各無線通信端末２Ａ〜２Ｇに対して、集中管理サーバ１で計算された通信経路を通知し、各無線通信端末２Ａ〜２Ｇでは、それぞれ通信経路情報を経路情報記録部２４に記録することができる。そして、各無線通信端末２Ａ〜２Ｇでは、経路情報記録部２４に記録された通信経路情報に基づいて、制御情報やデータを通信することができる。なお、さらに、多くの無線通信端末が無線通信システムを構築している場合でも、同様の手順によって通信経路情報を次々と各無線通信端末に転送することができる。
【００４３】
このように、本実施形態に係る無線通信システムにおいては、各無線通信端末２Ａ〜２Ｇにおける隣接端末を集中管理サーバ１で把握し、各無線通信端末２Ａ〜２Ｇの隣接端末に基づいて、集中管理サーバ１において通信経路を算出している。各無線通信端末２Ａ〜２Ｇには、算出された通信経路のみを送信・転送すればよいので、各無線通信端末２Ａ〜２Ｇ間を転送する経路情報の量を大幅に削減することができる。その結果、通信帯域および電力の浪費を防止することができる。また、集中管理サーバ１は、各無線通信端末２Ａ〜２Ｇの残余電力を把握しており、この残余電力をも考慮して通信経路を算出している。したがって、残余電力の多い無線通信端末を優先して通信経路を構築することができ、確実な無線通信を行うことができる。
【００４４】
本発明の第２の実施形態について説明する。図５は、本発明の第２の実施形態に係る無線通信システムの構成図である。図５に示すように、本実施形態に係る無線通信システムＭ２は、上記第１の実施形態と同様、集中管理サーバ１と、７つの無線通信端末２Ａ〜２Ｇを有している。これに加えて、本実施形態に係る無線通信システムＭ２は、蓄電器などの電源を有さない無線通信端末（以下「受動的無線通信端末」という）３Ａ〜３Ｃを有している。受動的無線通信端末３Ａ〜３Ｃは、いずれも同様の構成をなしており、送信機能を有していない。このため、能動的な無線通信を行うことができず、受動的な無線通信しか行うことができない態様とされている。
【００４５】
第１受動的無線通信端末３Ａは、無線リンクＬを介して第１無線通信端末２Ａと直接通信可能とされており、第２，第３受動的無線通信端末３Ｂ，３Ｃは、第７無線通信端末２Ｇと直接通信可能とされている。このため、第１受動的無線通信端末３Ａは、第１無線通信端末２Ａを介して、集中管理サーバ１および他の無線通信端末２Ｂ〜２Ｇと通信可能とされている。また、第２，第３受動的無線通信端末３Ｂ，３Ｃは、第７無線通信端末２Ｇを介して、集中管理サーバ１および他の無線通信端末２Ａ〜２Ｆと通信可能とされている。
【００４６】
かかる構成を有する本実施形態に係る無線通信システムＭ２においては、受動的無線通信端末３Ａ〜３Ｃは、いずれも第１無線通信端末２Ａまたは第７無線通信端末２Ｇと、送信機能を有する無線通信端末と直接的に通信可能とされている。このため、受動的無線通信端末３Ａ〜３Ｃを中継端末として機能させることがないので、無線通信システムＭ２内で制御情報やデータなどを確実に送信・転送することができる。
【００４７】
以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態に限定されるものではない。たとえば、上記実施形態では、集中管理サーバを１つのみ設けているが、集中管理サーバを複数設けることもできる。また、複数の集中管理サーバを設ける際に、集中管理サーバ同士を有線または無線で通信可能とする態様とすることもできる。
【００４８】
【発明の効果】
以上の説明のとおり、本発明によれば、経路を設定するための経路情報の量を削減し、通信帯域と電力の浪費を防止することができる。また、経路を設定する際に端末の残余電力を考慮し、残余電力の多い端末を優先的に中継する経路を構築することができる。したがって、利用可能な電力に制限がある無線通信端末の電源の寿命を伸ばすことができる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態に係る無線通信システムの構成図である。
【図２】第１の実施形態に係る集中管理サーバのブロック構成図である。
【図３】第１の実施形態に係る無線通信端末の構成を示すブロック構成図である。
【図４】集中型経路計算の手順を示すフローである。
【図５】第２の実施形態に係る無線通信システムの構成図である。
【符号の説明】
１…集中管理サーバ、２，２Ａ〜２Ｇ…無線通信端末、３Ａ〜３Ｃ…受動的無線通信端末、１１…無線通信部、１２…中央処理部、１３…経路情報計算部、１４…接続形態記録部、１５…残余電力記録部、２１…無線通信部、２２…中央処理部、２３…隣接端末記録部、２４…経路情報記録部、２５…残余電力監視部、Ｌ…無線リンク、Ｍ１，Ｍ２…無線通信システム。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless communication system, and more particularly, to an autonomous distributed wireless network which is a wireless relay communication system, and a wireless communication terminal, a centralized management server, and a communication path setting method used therein.
[0002]
[Prior art]
A wireless relay type communication formed by a collection of wireless communication terminals includes an autonomous distributed wireless network (hereinafter, referred to as an “ad hoc network”). In this ad hoc network, a method in which a data transfer route is not set in advance is adopted, so that a communication band for transferring data throughout the network and power consumption of terminals tend to increase. . In order to reduce these communication bands and power consumption, it is important to control the path of the wireless communication terminal (relay terminal) that transfers the data.
[0003]
As a route control in this ad hoc network, there is a conventional route control disclosed in, for example, JP-A-2000-252992. In the ad hoc network disclosed in this publication, the pillar coefficient of a communication route that has become unusable is defined as a lifetime, and the broadcast transmission range with a margin added to the vicinity of the terminal to be subjected to route reconstruction is defined. To be limited. For this reason, the traffic due to the useless broadcast of the control packet is reduced.
[0004]
[Patent Document 1]
JP 2000-252992 A
[Problems to be solved by the invention]
However, in the method of determining a relay terminal disclosed in Patent Document 1, there is no change in that the path information held by each terminal is transferred to adjacent terminals one after another, thereby mutually transmitting the path information. Therefore, an enormous amount of route information is transmitted in proportion to the multiplier of the number of source terminals and the number of terminals constituting the network, and the problem of wasting communication bandwidth and power consumption of the terminals still remains.
[0006]
Therefore, an object of the present invention is to reduce the amount of route information for setting a route, prevent waste of communication bandwidth and power, and further consider the remaining power of a terminal when setting a route, An object of the present invention is to construct a route for relaying a terminal having a large power with priority.
[0007]
[Means for Solving the Problems]
A wireless communication system according to the present invention that has solved the above-mentioned problems has an autonomous distributed type in which wireless communication of data is enabled via a wireless link between a plurality of wireless communication terminals each having a data transmitting / receiving function and a relay function. In the wireless communication system, a central management server capable of wirelessly communicating with at least one of the plurality of wireless communication terminals is provided, and each wireless communication terminal has an adjacent terminal recording unit that records an adjacent terminal via a wireless link. A route information recording unit that records route information indicating a data transfer destination, and a centralized management server stores a connection mode storage unit that stores information on adjacent terminals transmitted from the wireless communication terminal; And a route information calculation unit that calculates a communication route based on the connection form of the terminal.
[0008]
In the wireless communication system according to the present invention, a centralized management server capable of communicating with the wireless communication terminal is provided, and in the centralized management server, a connection mode recording unit that stores adjacent terminal information obtained from each wireless communication terminal, A route information calculation unit for calculating a communication route from the connection form. In this route information calculation unit, by calculating a communication route based on a terminal adjacent to each wireless communication terminal, it is possible to reduce the amount of route information for setting a route and prevent waste of communication bandwidth and power. it can.
[0009]
Here, the wireless communication terminal further includes a remaining power monitoring unit that monitors the remaining power of the wireless communication terminal, and the central management server further includes a remaining power recording unit that records the remaining power notified from the wireless communication terminal. In addition, it is preferable that the path information calculation unit in the central management server calculates the communication path based on the connection form of each wireless communication terminal and the remaining power of the wireless communication terminal.
[0010]
According to the present invention, the communication route is calculated in the centralized management server in consideration of the remaining power. For this reason, a communication path that avoids wireless communication terminals with low residual power can be used, so that a reliable communication path can be secured.
[0011]
Further, the wireless communication terminal used in the wireless communication system is a wireless communication terminal used in the wireless communication system according to claim 1, wherein the centralized management server or the wireless communication terminal uses a wireless communication terminal for identifying an adjacent terminal. The control information is transferred, and the adjacent centralized management server or wireless communication terminal grasped based on the control information is recorded in the adjacent terminal recording unit.
[0012]
Further, it is possible to further include a remaining power monitoring unit that monitors the remaining power, and notify the centralized management server of the remaining power monitored by the remaining power monitoring unit.
[0013]
Further, the route information indicating the transfer destination transmitted from the central management server may be sequentially transferred by the wireless communication terminal, and the route information may be recorded in the route information recording unit.
[0014]
The wireless communication terminal of these aspects can be used for the wireless communication system of the present invention.
[0015]
The central management server used in the above wireless communication system calculates a connection mode of the wireless communication terminal based on information of the adjacent terminal collected from the wireless communication terminal, and stores the information of the calculated connection mode in a connection mode recording unit. Is to be recorded.
[0016]
Here, based on the connection form of the wireless communication system recorded in the connection form recording unit, the path information calculation unit calculates path information indicating a data transfer destination, and notifies the calculated path information to the wireless communication terminal. It is preferable to use an embodiment.
[0017]
Further, the connection mode of the wireless communication terminal is calculated based on the information of the adjacent terminal collected from the wireless communication terminal, and the information of the calculated connection mode is recorded in the connection mode recording unit, and is notified from the wireless communication terminal. The remaining power may be recorded in the remaining power recording unit for each wireless communication terminal.
[0018]
At this time, based on the connection configuration of the wireless communication system recorded in the connection configuration recording unit and the remaining power of the wireless communication terminal recorded in the remaining power recording unit, the path information indicating the data transfer destination in the path information calculation unit is changed. It is preferable that the route information is calculated and the calculated route information is notified to the wireless communication terminal.
[0019]
These central management servers can be used in the wireless communication system.
[0020]
On the other hand, the communication path setting method according to the present invention that has solved the above-described problem enables wireless communication of data via a wireless link between a plurality of wireless communication terminals each having a data transmission / reception function and a relay function. A communication path setting method for setting a path of a wireless link in an autonomous distributed wireless communication system, wherein the wireless communication system is provided with a central management server capable of wireless communication with at least one of a plurality of wireless communication terminals. An adjacent terminal recording step in which the wireless communication terminal records the adjacent centralized management server or the wireless communication terminal in the adjacent terminal recording unit, and the wireless communication terminal transmits the adjacent terminal information recorded in the adjacent terminal recording unit to the centralized management server. The adjacent terminal notifying step of notifying, and the central management server, based on the information of the adjacent terminal notified from the wireless communication terminal, A connection mode calculation step of calculating a connection mode and recording the connection mode in a connection mode recording unit; and a path information calculation unit of the central management server, which performs wireless communication based on the connection mode of each wireless communication terminal recorded in the connection mode recording unit. A route calculating step of calculating route information of wireless communication to the terminal; and a route information notifying step of notifying the wireless communication terminal of the route information calculated by the central management server in the route information calculating unit. .
[0021]
Further, in the adjacent terminal notification step, the wireless communication terminal notifies the central management server of the remaining power of each wireless communication terminal recorded in the remaining power recording unit together with the information of the adjacent terminal, and in the route calculation step, It is preferable that the route information is calculated based on the connection form and the surplus power of each ship communication terminal.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0023]
FIG. 1 is a configuration diagram of the wireless communication system according to the first embodiment of the present invention. As shown in FIG. 1, a wireless communication system M1 according to the present embodiment is a communication system configuring an ad hoc network, and includes a centralized management server 1 and a plurality of, in this embodiment, seven wireless communication terminals 2A to 2G. The centralized management server 1 and each of the wireless communication terminals 2A to 2G can perform wireless communication. In this embodiment, for convenience of explanation, the number of wireless communication terminals is seven, but it is of course possible to construct a wireless communication system between many wireless communication terminals.
[0024]
Among the wireless communication terminals 2A to 2G, the first wireless communication terminal 2A and the second wireless communication terminal 2B can directly wirelessly communicate with the central management server 1, and the other wireless communication terminals 2C to 2G Wireless communication with the central management server 1 is possible via wireless communication terminals 2A to 2G other than the user. For example, the third wireless communication terminal 2C can wirelessly communicate with the centralized management server 1 via the first wireless communication terminal 2A or the second wireless communication terminal 2B, and the seventh wireless communication terminal 2G can communicate with the fourth wireless communication terminal 2G. It is possible to wirelessly communicate with the central management server 1 via the terminal 2D, the second wireless communication terminal 2B, and the like. Therefore, each of the wireless communication terminals 2A to 2G transmits and receives control information and data, and also functions as a relay terminal for control information and data.
[0025]
Next, the centralized management server 1 in the wireless communication system according to the present embodiment will be described. FIG. 2 is a block configuration diagram of the centralized management server according to the present embodiment. As shown in FIG. 2, the centralized management server 1 according to the present embodiment includes a wireless communication unit 11. The wireless communication unit 11 has a function of transmitting and receiving data to and from the wireless communication terminals 2A and 2B, receives data transmitted from the wireless communication terminals 2A and 2B, or wirelessly transmits data created by itself. It transmits to communication terminals 2A and 2B. The wireless communication unit 11 is connected to the central processing unit 12 and performs wireless communication with the wireless communication terminals 2A, 2B and the like based on a command from the central processing unit 12.
[0026]
In addition to the wireless communication unit 11, a route information calculation unit 13, a connection mode recording unit 14, and a remaining power recording unit 15 are connected to the central processing unit 12.
[0027]
The route information calculation unit 13 relays the wireless communication terminals 2A to 2G based on information such as the connection configuration recorded in the connection configuration recording unit 14 and the remaining power recording unit 15 and the residual power of each of the wireless communication terminals 2A to 2G. Calculate the communication path to be performed.
[0028]
In the connection form recording unit 14, adjacent terminals of the wireless communication terminals 2A to 2G transmitted from the wireless communication terminals 2A to 2G are recorded as connection form information. Further, the remaining power recording unit 15 records the remaining power information transmitted from each of the wireless communication terminals 2A to 2G. The connection form recording unit 14 and the remaining power recording unit 15 output the stored connection form information and the remaining power information to the route information calculation unit 13, respectively.
[0029]
Subsequently, a configuration of the wireless communication terminal according to the present embodiment will be described. The wireless communication terminals 2A to 2G according to the present embodiment all have the same configuration. FIG. 3 is a block diagram showing a configuration of the wireless communication terminal according to the present embodiment. As shown in FIG. 3, the wireless communication terminal 2 according to the present embodiment includes a wireless communication unit 21. The wireless communication unit 21 has a function of transmitting and receiving data to and from the centralized management server 1 and the wireless communication terminals 2A to 2G other than itself. , Or transmits data created by itself to the central management server 1 and the wireless communication terminals 2A to 2G other than itself. Further, the wireless communication unit 21 is connected to the central processing unit 22 and, based on a command from the central processing unit 22, communicates with the central management server 1 and the wireless communication terminals other than the wireless communication terminals 2A to 2G. Perform wireless communication.
[0030]
The central processing unit 22 is connected to an adjacent terminal recording unit 23, a route information recording unit 24, and a remaining power monitoring unit 25 in addition to the wireless communication unit 21.
[0031]
The adjacent terminal recording unit 23 monitors the control information or data transferred between the wireless communication terminals 2 and 2 regularly or irregularly, and thereby, via the wireless link L among the wireless communication terminals 2A to 2G. It records which of the wireless communication terminals 2A to 2G the adjacent terminal is or the central management server 1.
[0032]
For example, in the example shown in FIG. 1, the adjacent terminals of the first wireless communication terminal 2A are the central management server 1 and the third wireless communication terminal 2C, and the adjacent terminals of the second wireless communication terminal 2B are the central management server 1, The third wireless communication terminal 2C, the fourth wireless communication terminal 2D, and the fifth wireless communication terminal 2E. In addition, since the adjacent terminal is any one of the wireless communication terminals 2A to 2G or the central management server 1 that is the data transmission source, the adjacent terminal is identified by specifying the data transmission source. be able to. Further, the wireless communication terminal 2 notifies the central management server 1 of the recorded neighboring terminal information directly or indirectly.
[0033]
The route information recording unit 24 records the communication route information notified from the central management server 1. The wireless communication terminal 2 determines a transfer destination of control information and data based on the communication path information.
[0034]
The remaining power monitoring unit 25 monitors the power remaining in its own battery (not shown). In the wireless communication terminal 2, the remaining power information monitored by the remaining power monitoring unit 25 is directly or indirectly notified to the central management server 1 via the wireless communication unit 21.
[0035]
Next, an operation of the wireless communication system according to the present embodiment and a method of setting a communication path in the wireless communication system will be described. FIG. 4 is a flowchart illustrating a procedure of calculating a communication path in the wireless communication system according to the present embodiment. As illustrated in FIG. 4, the adjacent terminal recording unit 23 of the wireless communication terminal 2 stores information indicating which of the wireless communication terminals 2 </ b> A to 2 </ b> G is the adjacent communication terminal or the central management server 1. To the central management server 1 directly or indirectly. In the centralized management server 1, the transmitted adjacent terminal information is received by the wireless communication unit 11, and is output to the connection form recording unit 14 (S1). The connection mode recording unit 14 stores the output adjacent terminal information.
[0036]
Meanwhile, the central management server 1 transmits control information requesting notification of adjacent terminal information directly or indirectly to each of the wireless information terminals 2A to 2G as needed. This control information is sequentially transferred to each of the wireless communication terminals 2A to 2G via the wireless communication terminals 2A to 2G, and the transfer of the control information is performed from an adjacent terminal. Therefore, when transferring this control information, each of the wireless communication terminals 2A to 2G can acquire the respective adjacent terminal information, and records the adjacent terminal information in the adjacent terminal recording unit 23.
[0037]
In the adjacent terminal recording unit 23, an upper limit is set for the number of times of transfer of the control information, and the adjacent information is transferred while reaching the upper limit while recording the number of times of transfer in the control information. Thus, the adjacent terminal information in each of the wireless communication terminals 2A to 2G can be obtained. In each of the wireless communication terminals 2A to 2G, the wireless communication terminals 2A to 2G transmit the information of the adjacent terminal recording unit 23 to the surrounding wireless communication terminals 2A to 2G in the reverse order of transferring the control information. Thereafter, the adjacent terminal information is transmitted to the central management server 1 in the reverse order of transferring the control information.
[0038]
On the other hand, the remaining power monitoring unit 25 in each of the wireless communication terminals 2A to 2G monitors the remaining power of the battery in each of the wireless communication terminals 2A to 2G. Each of the wireless communication terminals 2A to 2G notifies the centralized management server 1 of the monitored remaining power information directly or indirectly. The residual power information may be transmitted simultaneously when, for example, transmitting the adjacent terminal information to the central management server 1. The central management server 1 outputs the received remaining power information of each of the wireless communication terminals 2A to 2G to the remaining power recording unit 15 (S2). The remaining power recording unit 15 records the output remaining power information of each of the wireless communication terminals 2A to 2G.
[0039]
Here, in the central management server 1, adjacent terminal information is accumulated in the connection form recording unit 14, and residual power information is recorded in the residual power recording unit 15. The adjacent terminal information and the remaining power information are output from the connection mode recording unit 14 and the remaining power recording unit 15 to the route information calculation unit 13 (S3, S4). The route information calculation unit 13 calculates a communication route based on the adjacent terminal information and the remaining power information. When calculating the communication path, the adjacent terminal information and the remaining power information are used, but the calculation can be performed only from the adjacent terminal information or can be calculated from the adjacent terminal information and the remaining power information. Specifically, first, based on the adjacent terminal information, a communication path that provides the shortest path for transmitting information to each of the wireless information terminals 2A to 2G is calculated. The shortest communication path that is the communication path that provides the shortest path can be set as the communication path. When the remaining power information is used, the remaining power information in each of the wireless communication terminals 2 </ b> A to 2 </ b> G is referred to, and for example, it is assumed that there is a wireless communication terminal in which the remaining power decreases so as to fall below a predetermined threshold. . In this case, a wireless communication link to a wireless communication terminal with low remaining power can be excluded from the route candidates, and the shortest communication route can be used as the communication route.
[0040]
When the communication path is calculated by the path information calculation unit 13 in this way, the calculated communication path is output to the wireless communication unit 11. The central management server 1 outputs the communication path calculated via the wireless communication unit 11 to each of the wireless communication terminals 2A to 2G directly or indirectly. First, the central management server 1 notifies communication route information to the first and second wireless communication terminals 2A and 2B, which are adjacent terminals. In the first and second wireless communication terminals 2A and 2B, the notified communication route information is received by the wireless communication unit 21, and is output from the wireless communication unit 21 to the route information recording unit 24 (S5). To record. The wireless communication terminals 2A and 2B determine a terminal to which information and data are to be transferred based on the communication route information recorded in the route information recording unit 24.
[0041]
In the first and second wireless communication terminals 2A and 2B, the communication path information is output from the wireless communication unit 21 to the path information recording unit 24, and based on the communication path information recorded in the path information recording unit 24, The notified communication path information is transferred to the third to fifth wireless communication terminals 2C to 2E serving as the next adjacent terminals. In the wireless communication terminals 2C to 2E to which the communication path information has been transferred, similarly to the first and second wireless communication terminals 2A and 2B, the communication path information is output from the wireless communication unit 21 to the path information recording unit 24, and the path information is output. The information is recorded in the recording unit 24. At the same time, based on the route information recorded in the route information recording unit 24, the communication route information is further transferred to the sixth and seventh wireless communication terminals 2F and 2G serving as adjacent terminals.
[0042]
In this way, the communication path calculated by the central management server 1 is notified to each of the wireless communication terminals 2A to 2G, and each of the wireless communication terminals 2A to 2G stores the communication path information in the path information recording unit 24. Can be recorded. Then, each of the wireless communication terminals 2A to 2G can communicate control information and data based on the communication route information recorded in the route information recording unit 24. In addition, even when many wireless communication terminals construct a wireless communication system, communication path information can be transferred to each wireless communication terminal one after another by the same procedure.
[0043]
As described above, in the wireless communication system according to the present embodiment, the centralized management server 1 grasps the adjacent terminals of the wireless communication terminals 2A to 2G, and performs centralized management based on the adjacent terminals of the wireless communication terminals 2A to 2G. The server 1 calculates a communication path. Since only the calculated communication path needs to be transmitted and transferred to each of the wireless communication terminals 2A to 2G, the amount of path information transferred between each of the wireless communication terminals 2A to 2G can be significantly reduced. As a result, waste of the communication band and power can be prevented. The centralized management server 1 also knows the remaining power of each of the wireless communication terminals 2A to 2G, and calculates the communication path in consideration of the remaining power. Therefore, a communication path can be constructed by giving priority to a wireless communication terminal having a large remaining power, and reliable wireless communication can be performed.
[0044]
A second embodiment of the present invention will be described. FIG. 5 is a configuration diagram of the wireless communication system according to the second embodiment of the present invention. As illustrated in FIG. 5, the wireless communication system M2 according to the present embodiment includes a centralized management server 1 and seven wireless communication terminals 2A to 2G, as in the first embodiment. In addition, the wireless communication system M2 according to the present embodiment includes wireless communication terminals (hereinafter, referred to as “passive wireless communication terminals”) 3A to 3C that do not have a power supply such as a battery. Each of the passive wireless communication terminals 3A to 3C has the same configuration and does not have a transmission function. Therefore, active wireless communication cannot be performed, and only passive wireless communication can be performed.
[0045]
The first passive wireless communication terminal 3A can directly communicate with the first wireless communication terminal 2A via the wireless link L, and the second and third passive wireless communication terminals 3B and 3C perform the seventh wireless communication. Direct communication with the terminal 2G is possible. Therefore, the first passive wireless communication terminal 3A can communicate with the central management server 1 and the other wireless communication terminals 2B to 2G via the first wireless communication terminal 2A. The second and third passive wireless communication terminals 3B and 3C can communicate with the central management server 1 and the other wireless communication terminals 2A to 2F via the seventh wireless communication terminal 2G.
[0046]
In the wireless communication system M2 according to the present embodiment having such a configuration, each of the passive wireless communication terminals 3A to 3C is different from the first wireless communication terminal 2A or the seventh wireless communication terminal 2G and a wireless communication terminal having a transmission function. It is possible to communicate directly with. Therefore, since the passive wireless communication terminals 3A to 3C do not function as relay terminals, control information, data, and the like can be reliably transmitted and transferred in the wireless communication system M2.
[0047]
As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to the above embodiments. For example, in the above embodiment, only one central management server is provided, but a plurality of central management servers may be provided. When a plurality of centralized management servers are provided, the centralized management servers may be able to communicate with each other by wire or wirelessly.
[0048]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the amount of route information for setting a route and prevent communication bandwidth and power from being wasted. In addition, it is possible to construct a route that preferentially relays a terminal having a large residual power by considering the residual power of the terminal when setting the route. Therefore, it is possible to extend the life of the power supply of the wireless communication terminal having a limited available power.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a wireless communication system according to a first embodiment of the present invention.
FIG. 2 is a block diagram of a centralized management server according to the first embodiment.
FIG. 3 is a block diagram showing a configuration of the wireless communication terminal according to the first embodiment.
FIG. 4 is a flowchart showing a procedure of a centralized route calculation.
FIG. 5 is a configuration diagram of a wireless communication system according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Central management server, 2, 2A-2G ... Wireless communication terminal, 3A-3C ... Passive wireless communication terminal, 11 ... Wireless communication part, 12 ... Central processing part, 13 ... Route information calculation part, 14 ... Connection form record Unit, 15: remaining power recording unit, 21: wireless communication unit, 22: central processing unit, 23: adjacent terminal recording unit, 24: path information recording unit, 25: remaining power monitoring unit, L: wireless link, M1, M2 ... wireless communication system.

Claims

Between a plurality of wireless communication terminals each having a data transmission / reception function and a relay function, in an autonomous distributed wireless communication system in which wireless communication of data is enabled via a wireless link,
A central management server capable of wireless communication with at least one of the plurality of wireless communication terminals is provided,
Each of the wireless communication terminals has an adjacent terminal recording unit that records an adjacent terminal via the wireless link, and a path information recording unit that records path information indicating a data transfer destination,
The central management server has a connection mode storage unit that stores information on adjacent terminals transmitted from a wireless communication terminal, and a path information calculation unit that calculates a communication path based on the connection mode of each of the adjacent terminals.
A wireless communication system, comprising:

The wireless communication terminal further has a remaining power monitoring unit that monitors the remaining power of the wireless communication terminal,
The central management server further includes a remaining power recording unit that records the remaining power notified from the wireless communication terminal,
The wireless communication system according to claim 1, wherein the route information calculation unit in the central management server calculates a communication route based on a connection mode of each wireless communication terminal and a remaining power of the wireless communication terminal.

A wireless communication terminal used in the wireless communication system according to claim 1,
Transfer control information for grasping the adjacent terminal transmitted by the central management server or the wireless communication terminal,
A wireless communication terminal that records an adjacent centralized management server or wireless communication terminal grasped based on the control information in the adjacent terminal recording unit.

Further comprising a remaining power monitoring unit for monitoring the remaining power,
The wireless communication terminal according to claim 3, wherein the remaining power monitored by the remaining power monitoring unit is notified to a central management server.

The route information indicating the transfer destination transmitted from the central management server is sequentially transferred by the wireless communication terminal,
The wireless communication terminal according to claim 3, wherein the route information is recorded in a route information recording unit.

A central management server used for the wireless communication system according to claim 1,
Calculating the connection form of the wireless communication terminal based on information of the adjacent terminal collected from the wireless communication terminal,
A centralized management server that records the calculated information of the connection mode in a connection mode recording unit.

Based on the connection form of the wireless communication system recorded in the connection form recording unit, in the path information calculation unit to calculate the route information indicating the data transfer destination,
The centralized management server according to claim 6, wherein the calculated route information is notified to the wireless communication terminal.

A centralized management server used in the wireless communication system according to claim 2,
Calculating the connection form of the wireless communication terminal based on information of the adjacent terminal collected from the wireless communication terminal,
Record the calculated connection form information in the connection form recording unit,
A centralized management server that records a residual power notified from the wireless communication terminal in a residual power recording unit for each wireless communication terminal.

Based on the connection form of the wireless communication system recorded in the connection form recording unit and the remaining power of the wireless communication terminal recorded in the remaining power recording unit, the path information indicating the transfer destination of data in the path information calculation unit. Calculate,
The centralized management server according to claim 8, wherein the calculated route information is notified to the wireless communication terminal.

Communication for setting a path of the wireless link in a distributed autonomous wireless communication system in which wireless communication of data is enabled via a wireless link between a plurality of wireless communication terminals each having a data transmission / reception function and a relay function A route setting method,
The wireless communication system is provided with a central management server capable of wireless communication with at least one of the plurality of wireless communication terminals,
An adjacent terminal recording step of recording the centralized management server or the wireless communication terminal adjacent to the wireless communication terminal in an adjacent terminal recording unit,
An adjacent terminal notification step in which the wireless communication terminal notifies the central management server of adjacent terminal information recorded in an adjacent terminal recording unit,
The connection management step of calculating the connection mode of each wireless communication terminal based on the information of the adjacent terminal notified by the central management server from the wireless communication terminal, and recording the connection mode in the connection mode recording unit,
In the route information calculation unit of the central management server, a route calculation step of calculating route information of wireless communication to the wireless communication terminal based on a connection mode of each wireless communication terminal recorded in a connection mode recording unit;
A route information notification step of notifying the wireless communication terminal of the route information calculated by the central management server in the route information calculation unit;
A communication path setting method comprising:

In the adjacent terminal notification step, the wireless communication terminal notifies the central management server of the remaining power of each wireless communication terminal recorded in the remaining power recording unit together with information of the adjacent terminal,
The communication route setting method according to claim 10, wherein in the route calculation step, the route information is calculated based on a connection form of each of the wireless communication terminals and surplus power of each of the ship communication terminals.