JP3599032B2 - Wireless communication system, wireless communication method, and wireless station - Google Patents

Wireless communication system, wireless communication method, and wireless station Download PDF

Info

Publication number
JP3599032B2
JP3599032B2 JP2002043120A JP2002043120A JP3599032B2 JP 3599032 B2 JP3599032 B2 JP 3599032B2 JP 2002043120 A JP2002043120 A JP 2002043120A JP 2002043120 A JP2002043120 A JP 2002043120A JP 3599032 B2 JP3599032 B2 JP 3599032B2
Authority
JP
Japan
Prior art keywords
station
wireless
channel
notification packet
master station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002043120A
Other languages
Japanese (ja)
Other versions
JP2002325273A (en
Inventor
晃平 水野
栄亮 工藤
博人 須田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2002043120A priority Critical patent/JP3599032B2/en
Publication of JP2002325273A publication Critical patent/JP2002325273A/en
Application granted granted Critical
Publication of JP3599032B2 publication Critical patent/JP3599032B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Description

【0001】
【発明の属する技術分野】
本発明は、複数の無線局間で構成されるマルチホップ無線通信ネットワークにおける無線通信システムに関する。
【0002】
【従来の技術】
無線LANや移動通信システムなどの無線パケット伝送方法において、自律分散型のアクセス方式として、CSMA/CA(Carrier Sense Multiple Access with Collision Avoidance)方式がある。この方式では、データパケットを送信する前に一定時間送信予定のチャネルが空いているかどうかを確認するため、パケットの衝突を低減することが可能となる。上記の方法は、ANSI/IEEE Std802.11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specificationに記されている通り、IEEE802.11標準規格のMACプロトコルとして採用されている。
【0003】
【発明が解決しようとする課題】
しかしながら、自律分散型であるCSMA/CA方式をマルチホップ無線通信ネットワークに適用すると、各々のリンクにおいて競合が発生し、再送しなければならないので、エンドエンド間において大きな遅延ゆらぎが生じる。また途中のリンクで他の無線局により無線チャネルが使用されている場合、無線チャネルが空くまで送信することができないため、遅延が増加しスループットが劣化する。
【0004】
一方集中制御型のアクセス方式であるPolling方式または集中制御型のアクセス方式と自律分散型のアクセス方式を時間的に分割して適用するアクセス方式であるPolling/CSMA方式は親局が子局の送信を管理するため、パケットの衝突が起こらず遅延・遅延ゆらぎが低減しスループットが向上し、QoS(Quality of Service)の保証が可能となる。しかし、マルチホップ無線ネットワークでは単一の親局で全ての無線局を管理できないため、従来のPolling方式及びPolling/CSMA方式をマルチホップ無線ネットワークに適用することができないという問題点がある。
【0005】
本発明は上記問題点を改善するもので、その目的はマルチホップ無線通信ネットワークにおいて、低遅延、低遅延ゆらぎ、高スループット、高いQoSの保証を実現するパケット伝送のための無線通信システムを提供することにある。
【0006】
【課題を解決するための手段】
上記目的を達成するための本発明の特徴は複数の無線局を有し、各無線局はパケット無線通信のための複数の無線通信手段を有し、各無線局はパケット無線通信のための複数の無線チャネルを用いる無線通信システムにおいて、各無線局は自局内の通信手段間で信号を中継する手段を有し、各無線局は、各無線チャネル毎に、適応的に、送信権を管轄し自局の制御に従って信号を伝送する親局、又は、親局の制御に従って信号を伝送する子局として動作する手段を有し各無線局は他の無線局と1つ以上の無線局を介して通信する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継する無線通信システムにある。
【0007】
また、上記目的を達成するための本発明の特徴は、複数の無線局を有し、各無線局はパケット無線通信のための複数の無線通信手段を有し、各無線局はパケット無線通信のための複数の無線チャネルを用いる無線通信システムにおいて、各無線局は、自局内の通信手段間で信号を中継する手段を有し、各無線局は、各無線チャネル毎に、適応的に、送信権を管轄し自局の制御に従って信号を伝送する親局、又は、親局の制御に従って信号を伝送する子局として動作する手段を有し、さらに自律分散アクセスで動作する手段を有し、各 無線局は他の無線局と1つ以上の無線局を介して通信する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継する無線通信システムにもある。
【0008】
好ましくは、無線局があるチャネルで集中制御アクセスの親局として動作するとき、該親局は集中制御アクセスの開始を示す「開始通知パケット」を送信し、該開始通知パケットは当該親局のアドレスと、当該親局に属する全ての子局のアドレスと、各子局が該開始通知パケットに応答して「通信要求パケット」を親局に送信するまでの時間をふくみ、前記開始通知パケットを受信した各子局は開始通知パケットで指定された時刻に「通知要求パケット」を前記親局に送信する。
【0009】
好ましくは、あるチャネルで集中制御アクセスの親局と子局の関係で動作している無線局が、集中制御アクセスを終了するとき、親局は集中制御アクセスの終了を示す「終了通知パケット」を送信し、該終了通知パケットは集中制御アクセスの終了時刻と次の開始通知パケットが送信されるまでの時間と、該終了通知パケットを受信した子局が該終了通知パケットを他の子局に向けて中継すべきか否かの情報をふくみ、終了通知パケットを受信した子局は該終了通知パケットで通知された終了時刻に前記「終了通知パケット」を親局に送信する。
【0010】
好ましくは、各無線局はチャネル毎に一定時間のキャリアセンスを行い、親局からの開始通知パケットを受信したときは、当該チャネルにおいて前記親局に従属する子局として動作し、親局からの開始通知パケットを受信せず子局からの通信要求パケットを受信したときは、当該チャネルにおいて前記親局による集中制御アクセスが行われている間は送信を禁止する送信禁止局として動作し、その後親局又は子局から終了通知パケットを受信したときは、該終了通知パケットに記載される次の開始通知パケットの時刻までの間自律分散アクセスにより送信を行うこともでき、親局からの開始通知パケットを受信せず、かつ前記通信要求パケットを受信しないときは、当該チャネルで集中制御アクセスの親局として動作する。
【0011】
好ましくは、第1の無線局が親局からの開始通知パケットを受信せず、かつ、前記通信要求パケットを受信しないときは、他のチャネルで当該無線局に接続している第2の無線局を選択し、前記第1の無線局は当該チャネルで親局として動作し前記第2の無線局は当該親局に従属する子局として動作するか、又は前記第2の無線局が親局として動作し前記第1の無線局が当該親局に従属する子局として動作する。
【0012】
本発明の特徴は、更に、複数の無線局によって構成される無線ネットワークにおける無線局装置において、各無線局装置は無線通信のための複数のチャネルを有し、各無線局装置は集中制御アクセスにおける送信権を管轄する親局、親局に管理される子局、又は送信禁止局として動作可能であり、他の無線局間の通信を中継する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継する無線局装置にある。
【0013】
本発明の特徴は、更に、複数の無線局によって構成される無線ネットワークにおける無線局装置において、各無線局装置は無線通信のための複数のチャネルを有し、各無線局装置は集中制御アクセスにおける送信権を管轄する親局、親局に管理される子局、又は送信禁止局として動作可能であり、さらに自律分散アクセルで動作可能であり、他の無線局間の通信を中継する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継する無線局装置にある。
【0014】
【発明の実施の形態】
図1は、本発明におけるパケット中継のためのチャネル構成図である。なお、無線局間の経路を決定する方法はAODV方式(Adhoc On-demand Distance Vector)として公知である。
【0015】
チャネルaからチャネルdまでの4つの無線チャネルを用いて送信局である無線局1から無線局2、無線局3…、無線局6の順番に中継して宛先局である無線局7まで伝送する場合を示す。各無線局はチャネル毎に集中制御アクセスにおける親局、子局又は送信禁止局である。図1に示すように無線局1は無線局2と通信を行なう際に、無線局1と無線局2の間に親局と子局の関係にあるチャネルcまたはチャネルdを用いて集中制御型のアクセス方式により通信を行なう。チャネルcでは無線局1が子局で無線局2が親局であり、一方、チャネルdでは無線局1が親局で無線局2が子局である。同様に無線局2は無線局3と通信を行なう際に、無線局2と無線局3の間に親局と子局の関係にあるチャネルbまたはチャネルcを用いて集中制御型のアクセス方式により通信を行なう。以下同様に無線局7まで、親局と子局の関係にあるチャネルを用いて通信を行なう。結局、無線局1から無線局7まで集中制御型のアクセス方式により通信を行なうことが可能となり、無線局1と無線局7の間でQoSを保証することが可能となる。
【0016】
上記実施例は全てのリンクで集中制御アクセスが行われる実施例である。いくつかのリンクでは、親局と子局の関係のない自律分散アクセスにより通信を行ってもよい。
【0017】
次に集中制御アクセスの例を図2A及び図2Bにより説明する。この実施例では親局21のサービスエリア61の範囲内に子局22,23,24がある。
【0018】
無線局21は、自局が親局として動作しているチャネルにおいて、無線局21に従属している子局(無線局22、無線局23及び無線局24)に対し集中制御の周期の開始を示す開始通知パケット101を送信する。開始通知パケット101には、無線局21、無線局22、無線局23及び無線局24のアドレス及び各子局が通信要求パケットを送信するべき時刻が記されている。
【0019】
無線局22は無線局21から開始通知パケット101を受信すると、無線局21に対し通信要求パケット201を送信する。次に無線局23が無線局21に対し通信要求パケット202を送信する。次に無線局24が無線局21に対し通信要求パケット203を送信する。
【0020】
無線局21は全ての通信要求パケットを受信完了する時間が経過した後、まず無線局22に対しPOLLパケット301を送信する。POLLパケットは公知のポーリング方式におけるPOLLパケットと同じで親局アドレスと子局アドレスをふくむ。POLLパケット301に応答して無線局22は無線局21にデータパケット401を送信し、無線局21はデータパケット401に対する確認ACK及び無線局23に対するPOLL(ACK+POLL)パケット501を送信する。これに応答して無線局23はデータパケット402を送信する。全ての無線局に対しPOLLパケットを送信終了すると、無線局21は集中制御の終了とデータパケット403に対する確認応答を示す終了通知パケット601を無線局22、無線局23及び無線局24に対して送信する。終了通知パケット601には集中制御アクセスの終了時刻と、次に無線局21が次の開始通知パケットを送信するまでの時間、及び終了通知パケットを他の子局に中継するか否かの制御情報が記されており、上記時間が経過するまで子局は自律分散制御により通信を行なうことが可能とする。
【0021】
上記実施例において、親局がPollingを開始する前に子局の通信要求パケットを受信するため、親局はその情報に従ってPollingを行なうことが可能である。また終了通知パケットを無線局21の電波の届かない円61の外側にある無線局に中継することが可能となる。
【0022】
次に図3A及び図3Bにより、終了通知パケットを親局のサービスエリアの外にまで中継するシーケンスを説明する。図3Bにおいて、無線局31は親局で、そのサービスエリアは円71で示され、その中に子局32,33,34があるものとする。
【0023】
無線局31は自局が親局として動作しているチャネルにおいて、無線局31から送信される信号を受信可能な円71の内側にある無線局32、無線局33及び無線局34に対し集中制御アクセスにより通信を行なっているものとする。集中制御アクセス(111,311,411,511,412,512,413)は図2Aの実施例と同じである。無線局31は無線局32、無線局33及び無線局34に対する集中制御アクセス(Polling)を終了すると終了通知パケット611を無線局32、無線局33及び無線局34に対し送信する。
【0024】
終了通知パケット611には無線局31、無線局32、無線局33及び無線局34のアドレス及び終了通知パケットを他の子局に中継させる制御情報が記されている。無線局32は無線局31から終了通知パケット611を受信すると終了通知パケット612を無線局32から送信される信号を受信可能な円72内に送信する。同様に無線局33及び無線局34も終了通知パケット613及び614を円73及び円74内に送信する。従って、終了通知パケットを無線局31のサービスエリア円71の外側にある無線局に送信することが可能となる。
【0025】
中継された終了通知パケット612,613,614は親局31でも受信することができる。
【0026】
なお、図3Bの円72,73,74の内部でかつ円71の外部の無線局は親局31からの信号を受信できないが、子局32,33又は34からの信号を受信することができる。これらの無線局は、親局31が集中制御アクセスを行っているときは、送信禁止局となり、親局31による集中制御アクセスが終了して子局(32,33又は34)から終了通知パケットを受信すると、当該子局との間で自律分散アクセスにより通信することができる。
【0027】
次に図4A及び図4Bにより、親局41のエリア83の範囲内に子局42,43があるときに、前記エリア83の範囲内の新規局44を親局41の子局として登録するシーケンスを説明する。
【0028】
無線局41は自局が親局として動作している無線チャネルにおいて、無線局42及び無線局43に対し集中制御アクセスにより通信を行なっているものとする。ここで無線局41から送信される信号を受信可能な円81の内にある無線局44が電源をONとして、無線局41が親局として動作しているチャネルにおいて新たに通信を開始するとする。
【0029】
親局41による子局42,43に対する集中制御アクセス(121,221,222,321,421,521,422,621)は図2A、または図3Aのシーケンスと同じである。
【0030】
新規無線局44は一定時間キャリアセンスを行い、無線局41から開始通知パケット121を受信した場合、無線局41(親局)に対し登録要求パケット721を送信する。登録要求パケットは自局のアドレスと、中継局があるときは中継局のアドレス、及び親局のアドレスをふくむ。この登録要求パケット721を送信する時刻はランダム時間後でも構わないしあらかじめ親局41により指定された時刻でも構わない。無線局41は無線局44から登録要求パケット721を受信すると、無線局44を自局の子局として動作することが可能である場合、無線局44に対し登録確認パケット821を送信する。登録確認パケットは、自局のアドレスと、中継局があるときは中継局のアドレス及び親局のアドレスをふくむ。無線局44は無線局41から登録確認パケット821を受信すると、これ以降当該チャネルにおいて無線局41の子局として動作する。以上により親局から送信される信号を受信可能な新規無線局を親局に登録することが可能となる。
【0031】
次に図5A及び図5Bにより、親局51のエリア91の範囲内に子局52と53があるとき、親局51のエリア91の範囲外にある新規局54を親局51に登録するシーケンスを説明する。
【0032】
無線局51から送信される信号を受信可能な円91の外にあり、無線局53から送信される信号を受信可能な円93の中にある無線局54が、無線局51が親局として動作している上記チャネルにおいて無線局54が電源をONとして新たに通信を開始するとする。
【0033】
親局51による子局52,53に対する集中制御は図2A、図3A、図4Aの場合と同じである。新規無線局54は一定時間キャリアセンスを行ない、無線局51から開始通知パケット131を受信せず無線局53から通信要求パケット232を受信した場合、無線局53に対し登録要求パケット731をランダム時間後に送信する。無線局53は無線局54から登録要求パケット731を受信した場合、送信可能な場合に無線局54に対し登録確認パケット831を送信する。
【0034】
この場合には新規無線局54は送信禁止局として登録される。これ以降無線局53は無線局51から終了通知パケット632を受信すると、無線局54に対し上記終了通知パケット633を中継する。終了通知パケット633には、当該チャネルにおいて無線局51が次の開始通知パケットを送信するまでの時間が記されている。無線局54は無線局53から終了通知パケット633を受信すると、終了通知パケット633に記されている次の開始通知パケットまでの時間において自律分散方式で通信を行なうことが可能となる。以上のとおり、親局から送信される信号を受信不可能であり、かつ子局から送信される信号を受信可能な新規無線局の送信を禁止し、親局による集中制御が終了すると上記新規無線局は親局の集中制御の終了を、子局の送信を通じて把握し、次の集中制御が開始されるまでの間自律分散方式を用いて通信を行なうことが可能となる。
【0035】
図6は、本発明における無線チャネルの配置例である。前述したシーケンスを行うことにより、図6のように各無線局に無線チャネルが配置される。図6のように各無線局に無線チャネルが配置されると、図1のように送信局から宛先局まで集中制御型のアクセス方式または、集中制御型のアクセス方式と自律分散型のアクセス方式を時間的に分割して適用するアクセス方式により通信を行なうことが可能となりQoSの保証が実現できる。
【0036】
図7は集中制御アクセスに参加していない新規の無線局が集中制御アクセスに親局又は子局として登録するときの動作の流れ図を示す。
【0037】
新規の無線局が登録しようとする無線局が複数あるとき、どの無線局に登録するかの選択は次の基準Aのいずれか又は組合せによる。
【0038】
基準A
(A1)有線ネットワークと接続するゲートウェイまでのホップ数の最も少ない無線局の順に選択する。
(A2)新規の無線局における受信電力が大きな無線局の順に選択する。
(A3)干渉量が小さな無線局の順に選択する。
(A4)既に接続している無線局の数が少ない無線局の順に選択する。
(A5)所要C/I(Carrier to Interference Ratio)を下回らないまで加えることができる干渉量の大きい順に選択する。
【0039】
登録相手の無線局が親局でないとき、新規無線局と登録相手局のいずれを親局とするかの選択は次の基準Bのいずれか又は組合せによる。
【0040】
基準B
(B1)新規の無線局を親局とする。
(B2)登録相手の無線局を親局とする。
(B3)移動無線局のときは電池容量の多い方の無線局を親局とする。
(B4)使用しているチャネル数が少ない方の無線局を親局とする。
(B5)干渉量の少ない方の無線局を親局とする。
【0041】
図7において、新規に登録しようとする無線局は全ての周波数チャネルにおいて一定時間キャリアセンスを行う(F1)。キャリアセンスを行った結果、開始通知パケット、送信要求パケット及び終了通知パケットの受信信号レベルが閾値を越えている場合、周波数チャネル及び接続無線局テーブルに書き込む。このテーブルには、当該チャネルにおける当該無線局からの受信電力レベル、当該チャネルにおける他の無線局からの干渉電力レベル、当該無線局が当該チャネルにおいて周波数を管理している親局として動作しているか、親局ではない子局として動作しているかが書き込まれる。これにより隣接に親局があるか否かが検出される(F3)。複数の親局が検出されたときは(F5)、前記基準Aによりひとつの親局を選択する(F7)。
【0042】
次に、選択された親局のチャネルで、当該新規無線局が子局として動作可能か否かを、例えば干渉量が許容値以下であるか否かを測定することにより判定する(F9,F15)。子局として動作可能なときは、子局として登録して(F11,F17)、登録フローを終了する(F19)。
【0043】
F9で子局としての動作が不可能と判定されたときは、全ての親局の検索が未了のときは(F13)、F9,F11の動作をくり返し、子局として登録可能な親局が検出されれば、その親局に子局として登録する。
【0044】
なお、新規登録局の近傍に複数の親局が存在して、全ての親局にそれぞれのチャネルでの登録を希望するときは、F11で子局として登録した後に終了(F19)する代りに、F13に進んでF9,F11により別の親局に対する登録を試みる。
【0045】
F1のキャリアセンスで近傍に親局が検出されないとき、F15で子局としての動作が不可能と判定されたとき、及び、F13で全ての親局を検索しても子局として登録できないときは、F21に進み、近傍の無線局とその空きチャネルを検索する。この検索は通信要求パケット又は終了通知パケットを検出することにより行う。ここで複数の無線局が検出されたときは前記基準Aによりひとつの無線局を選択する。
【0046】
F21で近傍の無線局と空きチャネルが検出されたときは、その空きチャネルを使用して通信可能か否かを、例えば干渉量の測定により判定する(F23)。F23で通信可能と判定されたときは、F29に進み、新規無線局が親局となるか子局となるかを前記基準Bにより決定し、F17で登録を行う。
【0047】
F23で通信不可能と判定されたときは、別の無線局とチャネルでの通信が可能か否かを判定する(F23,F25)。全ての無線局とチャネルで通信不可能なときは登録失敗となる(F27)。
【0048】
【発明の効果】
複数の無線局が存在するマルチホップ無線パケット通信ネットワークにおいて自律分散型のアクセス方式を用いた場合、遅延、遅延ゆらぎ及びスループットが劣化し、QoSを保証することができないが、本発明によれば集中制御型アクセス方式または集中制御型アクセス方式と自律分散型アクセス方式を時間的に分割して適用するアクセス方式を、複数チャネルを用いてマルチホップ無線パケット通信に適用することにより、集中制御を行なう親局をチャネル毎に決定することが可能となり、遅延や遅延ゆらぎを低減しスループットを向上させ、QoSを保証することが可能になる。
【図面の簡単な説明】
【図1】本発明におけるパケット中継のためのチャネル構成図である。
【図2A】本発明における第1のパケット処理シーケンス例である。
【図2B】図2Aに対応する送受信無線局の配置例である。
【図3A】本発明における第2のパケット処理シーケンス例である。
【図3B】図3Aに対応する送受信無線局の配置例である。
【図4A】本発明における第3のパケット処理シーケンス例である。
【図4B】図4Aに対応する送受信無線局の配置例である。
【図5A】本発明における第4のパケット処理シーケンス例である。
【図5B】図5Aに対応する送受信無線局の配置例である。
【図6】本発明における無線チャネルの配置例である。
【図7】新規無線局をネットワークに登録する動作のフローを示す。
【符号の説明】
a〜d 無線チャネル
11〜54 無線局
61〜93 電波の届く範囲
101〜131 開始通知パケット
201〜232 通信要求パケット
301〜331 POLLパケット
401〜432 データパケット
501〜531 ACK+POLLパケット
601〜633 終了通知パケット
711〜731 登録要求パケット
811〜831 登録確認パケット
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless communication system in a multi-hop wireless communication network configured between a plurality of wireless stations.
[0002]
[Prior art]
In a wireless packet transmission method such as a wireless LAN and a mobile communication system, there is a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) method as an autonomous distributed access method. In this method, it is possible to reduce the collision of packets because it is checked whether or not a channel scheduled to be transmitted for a certain time is free before transmitting a data packet. The above method is adopted as a MAC protocol of the IEEE802.11 standard as described in the ANSI / IEEE Std802.11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specification.
[0003]
[Problems to be solved by the invention]
However, if the autonomous distributed CSMA / CA scheme is applied to a multi-hop wireless communication network, contention occurs on each link and retransmission must be performed, resulting in large delay fluctuation between end and end. Also, when a wireless channel is used by another wireless station on an intermediate link, transmission cannot be performed until the wireless channel becomes free, so that delay increases and throughput deteriorates.
[0004]
On the other hand, in the Polling / CSMA method, which is an access method in which the centralized control type access method or the centralized control type access method and the autonomous decentralized access method are divided in time and applied, the master station transmits a slave station. Therefore, packet collision does not occur, delay and delay fluctuation are reduced, throughput is improved, and QoS (Quality of Service) can be guaranteed. However, in a multi-hop wireless network, since a single master station cannot manage all the wireless stations, there is a problem that the conventional Polling scheme and Polling / CSMA scheme cannot be applied to the multi-hop wireless network.
[0005]
The present invention has been made to solve the above problems, and an object of the present invention is to provide a wireless communication system for packet transmission that realizes low delay, low delay fluctuation, high throughput, and high QoS guarantee in a multi-hop wireless communication network. It is in.
[0006]
[Means for Solving the Problems]
Feature of the present invention for achieving the above object includes a plurality of radio stations, each radio station has a plurality of wireless communication means for packet radio communication, a plurality for each radio station packet radio communication In a wireless communication system using wireless channels , each wireless station has means for relaying a signal between communication means in the wireless station , and each wireless station adaptively controls a transmission right for each wireless channel. the master station for transmitting a signal according to the control of its own station, or includes means for operating as a slave station which transmits a signal under control of the master station, each radio station other radio station and one or more radio stations When communicating via a wireless channel, there is a wireless communication system that relays signals by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel .
[0007]
Further, a feature of the present invention for achieving the above object is to have a plurality of wireless stations, each wireless station having a plurality of wireless communication means for packet wireless communication, and each wireless station to perform packet wireless communication. In a wireless communication system using a plurality of wireless channels, each wireless station has means for relaying a signal between communication means in the own station, and each wireless station adaptively transmits signals for each wireless channel. A master station that controls a right and transmits a signal under the control of the own station, or has a unit that operates as a slave station that transmits a signal under the control of the master station, and further has a unit that operates with autonomous decentralized access, When a wireless station communicates with another wireless station via one or more wireless stations, the wireless station relays a signal by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel. There are also in wireless communication systems.
[0008]
Preferably, when the wireless station operates as a master station of the centralized control access on a certain channel, the master station transmits a “start notification packet” indicating the start of the centralized control access, and the start notification packet includes an address of the master station. Receiving the start notification packet, including the addresses of all the slave stations belonging to the master station, and the time until each slave station transmits a “communication request packet” to the master station in response to the start notification packet. Each of the slave stations transmits a "notification request packet" to the master station at the time designated by the start notification packet.
[0009]
Preferably, when a radio station operating in a relationship between a master station and a slave station for centralized control access on a certain channel ends the centralized control access, the master station sends an “end notification packet” indicating the end of the centralized control access. The end notification packet transmits the end time of the centralized control access, the time until the next start notification packet is transmitted, and the slave station receiving the end notification packet directs the end notification packet to another slave station. The slave station receiving the end notification packet transmits the "end notification packet" to the master station at the end time notified by the end notification packet .
[0010]
Preferably, each radio station performs carrier sense for a certain period of time for each channel, and when receiving a start notification packet from the master station, operates as a slave station subordinate to the master station in the channel, and When a communication request packet from a slave station is received without receiving a start notification packet, the mobile station operates as a transmission prohibition station that prohibits transmission while the central station performs centralized control access on the channel, and thereafter, operates as a transmission prohibition station. When an end notification packet is received from a station or a slave station, transmission can be performed by autonomous decentralized access until the time of the next start notification packet described in the end notification packet, and a start notification packet from the master station can be transmitted. When the communication control packet is not received and the communication request packet is not received, the mobile station operates as a master station of the centralized control access on the channel.
[0011]
Preferably, when the first wireless station does not receive the start notification packet from the master station and does not receive the communication request packet, the second wireless station connected to the wireless station via another channel The first radio station operates as a master station on the channel and the second radio station operates as a slave station subordinate to the master station, or the second radio station operates as a master station on the channel. Operate and the first wireless station operates as a slave station subordinate to the master station.
[0012]
The feature of the present invention is further provided in a wireless station device in a wireless network constituted by a plurality of wireless stations, wherein each wireless station device has a plurality of channels for wireless communication, and each wireless station device has It can operate as a master station having jurisdiction over the transmission right, a slave station managed by the master station, or a transmission prohibition station. When relaying communication between other wireless stations, the master station is determined for each wireless channel. And a relay station for relaying signals by centralized control access using a communication channel between the mobile station and the slave station .
[0013]
The feature of the present invention is further provided in a wireless station device in a wireless network constituted by a plurality of wireless stations, wherein each wireless station device has a plurality of channels for wireless communication, and each wireless station device has It can operate as a master station that controls the transmission right, a slave station managed by the master station, or a transmission prohibition station, and can also operate with an autonomous distributed accelerator, and when relaying communication between other wireless stations, And a radio station device that relays a signal by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a diagram showing a channel configuration for packet relay in the present invention. Note that a method of determining a route between wireless stations is known as an AODV method (Adhoc On-demand Distance Vector).
[0015]
Using four wireless channels from channel a to channel d, the wireless station 1 as a transmitting station is relayed in the order of wireless station 2, wireless station 3,..., Wireless station 6 and transmitted to wireless station 7 as a destination station. Show the case. Each radio station is a master station, a slave station, or a transmission prohibition station in centralized control access for each channel. As shown in FIG. 1, the wireless station 1 communicates with the wireless station 2 by using a channel c or a channel d having a relationship between a master station and a slave station between the wireless station 1 and the wireless station 2 for centralized control. Communication is performed by the access method of In channel c, wireless station 1 is a slave station and wireless station 2 is a master station, while in channel d, wireless station 1 is a master station and wireless station 2 is a slave station. Similarly, when communicating with the wireless station 3, the wireless station 2 uses a channel b or channel c between the wireless station 2 and the wireless station 3, which has a relationship between the master station and the slave station, according to a centralized control access method. Perform communication. Hereinafter, similarly, communication is performed up to the wireless station 7 using a channel having a relationship between the master station and the slave station. As a result, communication from the wireless station 1 to the wireless station 7 can be performed by the centralized control access method, and QoS between the wireless station 1 and the wireless station 7 can be guaranteed.
[0016]
The above embodiment is an embodiment in which centralized control access is performed on all links. In some links, communication may be performed by autonomous decentralized access having no relation between the master station and the slave stations.
[0017]
Next, an example of centralized control access will be described with reference to FIGS. 2A and 2B. In this embodiment, there are slave stations 22, 23, and 24 within the service area 61 of the master station 21.
[0018]
The wireless station 21 starts the central control cycle for the slave stations (the wireless station 22, the wireless station 23, and the wireless station 24) subordinate to the wireless station 21 on the channel in which the wireless station 21 is operating as the master station. The start notification packet 101 is transmitted. The start notification packet 101 describes the addresses of the wireless stations 21, 22, 22, and 24 and the time at which each slave station should transmit a communication request packet.
[0019]
Upon receiving the start notification packet 101 from the wireless station 21, the wireless station 22 transmits a communication request packet 201 to the wireless station 21. Next, the wireless station 23 transmits a communication request packet 202 to the wireless station 21. Next, the wireless station 24 transmits a communication request packet 203 to the wireless station 21.
[0020]
The wireless station 21 transmits a POLL packet 301 to the wireless station 22 after a lapse of time to complete reception of all communication request packets. The POLL packet is the same as the POLL packet in the known polling method, and includes a master station address and a slave station address. In response to the POLL packet 301, the wireless station 22 transmits a data packet 401 to the wireless station 21, and the wireless station 21 transmits a confirmation ACK for the data packet 401 and a POLL (ACK + POLL) packet 501 for the wireless station 23. In response, the wireless station 23 transmits a data packet 402. When the transmission of the POLL packet to all the radio stations is completed, the radio station 21 transmits an end notification packet 601 indicating the end of the centralized control and an acknowledgment to the data packet 403 to the radio stations 22, 23 and 24. I do. The end notification packet 601 includes the end time of the centralized control access, the time until the next wireless station 21 transmits the next start notification packet, and control information indicating whether or not to relay the end notification packet to another slave station. The slave station can perform communication by autonomous decentralized control until the above time elapses.
[0021]
In the above embodiment, since the master station receives the communication request packet of the slave station before starting the polling, the master station can perform the polling according to the information. In addition, it is possible to relay the end notification packet to a wireless station outside the circle 61 where the radio wave of the wireless station 21 does not reach.
[0022]
Next, referring to FIGS. 3A and 3B, a sequence for relaying the end notification packet to outside the service area of the master station will be described. In FIG. 3B, it is assumed that the wireless station 31 is a master station, and its service area is indicated by a circle 71, in which slave stations 32, 33, and 34 are located.
[0023]
The wireless station 31 performs centralized control on the wireless stations 32, 33, and 34 inside a circle 71 capable of receiving a signal transmitted from the wireless station 31 in a channel in which the wireless station 31 operates as a master station. It is assumed that communication is performed by access. Centralized control access (111, 311, 411, 511, 412, 512, 413) is the same as in the embodiment of FIG. 2A. When the radio station 31 ends the centralized control access (Polling) to the radio station 32, the radio station 33, and the radio station 34, the radio station 31 transmits an end notification packet 611 to the radio station 32, the radio station 33, and the radio station 34.
[0024]
The end notification packet 611 describes the addresses of the wireless stations 31, 32, 33 and 34 and control information for relaying the end notification packet to another slave station. Upon receiving the end notification packet 611 from the wireless station 31, the wireless station 32 transmits the end notification packet 612 within a circle 72 capable of receiving a signal transmitted from the wireless station 32. Similarly, the wireless stations 33 and 34 also transmit end notification packets 613 and 614 within the circles 73 and 74. Therefore, it is possible to transmit the end notification packet to a wireless station outside the service area circle 71 of the wireless station 31.
[0025]
The relayed end notification packets 612, 613, and 614 can also be received by the master station 31.
[0026]
Note that the radio stations inside circles 72, 73, and 74 and outside circle 71 in FIG. 3B cannot receive signals from master station 31, but can receive signals from slave stations 32, 33, or. . When the master station 31 is performing centralized control access, these wireless stations become transmission prohibited stations, and the centralized control access by the master station 31 ends, and a termination notification packet is sent from the slave station (32, 33 or 34). Upon reception, communication can be performed with the slave station by autonomous decentralized access.
[0027]
Next, referring to FIGS. 4A and 4B, when there are slave stations 42 and 43 within the area 83 of the master station 41, a sequence for registering the new station 44 within the area 83 as a slave station of the master station 41. Will be described.
[0028]
It is assumed that the wireless station 41 communicates with the wireless station 42 and the wireless station 43 by centralized control access on the wireless channel in which the wireless station 41 operates as a master station. Here, it is assumed that the wireless station 44 in the circle 81 capable of receiving the signal transmitted from the wireless station 41 turns on the power and newly starts communication on the channel in which the wireless station 41 operates as the master station.
[0029]
The centralized control access (121, 221, 222, 321, 421, 521, 422, 621) by the master station 41 to the slave stations 42 and 43 is the same as the sequence shown in FIG. 2A or 3A.
[0030]
The new wireless station 44 performs carrier sense for a certain period of time, and when receiving the start notification packet 121 from the wireless station 41, transmits a registration request packet 721 to the wireless station 41 (master station). The registration request packet includes the address of the own station, the address of the relay station if there is a relay station, and the address of the master station. The time at which the registration request packet 721 is transmitted may be a time after a random time or a time specified by the master station 41 in advance. Upon receiving the registration request packet 721 from the wireless station 44, the wireless station 41 transmits a registration confirmation packet 821 to the wireless station 44 if the wireless station 44 can operate as a slave station of the wireless station 44. The registration confirmation packet includes the address of the own station, the address of the relay station if there is a relay station, and the address of the master station. Upon receiving the registration confirmation packet 821 from the wireless station 41, the wireless station 44 thereafter operates as a slave station of the wireless station 41 on the channel. As described above, it is possible to register a new wireless station capable of receiving a signal transmitted from the master station in the master station.
[0031]
Next, referring to FIGS. 5A and 5B, when the slave stations 52 and 53 are within the area 91 of the master station 51, a sequence for registering the new station 54 outside the area 91 of the master station 51 with the master station 51. Will be described.
[0032]
The wireless station 54 outside the circle 91 capable of receiving the signal transmitted from the wireless station 51 and in the circle 93 capable of receiving the signal transmitted from the wireless station 53 operates the wireless station 51 as a master station It is assumed that the wireless station 54 turns on the power and starts a new communication in the above-mentioned channel.
[0033]
The centralized control by the master station 51 on the slave stations 52 and 53 is the same as in FIGS. 2A, 3A and 4A. The new wireless station 54 performs the carrier sense for a certain period of time, and when the communication request packet 232 is received from the wireless station 53 without receiving the start notification packet 131 from the wireless station 51, the registration request packet 731 is sent to the wireless station 53 after a random time. Send. When receiving the registration request packet 731 from the wireless station 54, the wireless station 53 transmits a registration confirmation packet 831 to the wireless station 54 when transmission is possible.
[0034]
In this case, the new wireless station 54 is registered as a transmission prohibited station. Thereafter, when receiving the end notification packet 632 from the wireless station 51, the wireless station 53 relays the end notification packet 633 to the wireless station 54. The end notification packet 633 describes the time until the wireless station 51 transmits the next start notification packet in the channel. Upon receiving the end notification packet 633 from the wireless station 53, the wireless station 54 can perform communication by the autonomous decentralized method until the next start notification packet described in the end notification packet 633. As described above, the transmission of a new radio station that cannot receive a signal transmitted from a master station and that can receive a signal transmitted from a slave station is prohibited, and when the centralized control by the master station ends, the new radio station is terminated. Can recognize the end of the centralized control of the master station through transmission of the slave station, and can perform communication using the autonomous decentralized method until the next centralized control is started.
[0035]
FIG. 6 is an example of arrangement of wireless channels according to the present invention. By performing the above-described sequence, a wireless channel is allocated to each wireless station as shown in FIG. When a wireless channel is allocated to each wireless station as shown in FIG. 6, a centralized control type access method from the transmitting station to the destination station as shown in FIG. Communication can be performed by an access method that is applied in a time-divided manner, and QoS can be guaranteed.
[0036]
FIG. 7 shows a flowchart of the operation when a new wireless station not participating in the centralized control access registers as a master station or a slave station in the centralized control access.
[0037]
When there are a plurality of radio stations to be registered by a new radio station, the selection of which radio station to register depends on one or a combination of the following criteria A.
[0038]
Standard A
(A1) The wireless stations having the smallest number of hops to the gateway connected to the wired network are selected in order.
(A2) New wireless stations are selected in descending order of received power.
(A3) The wireless stations with the smaller interference amount are selected in order.
(A4) The wireless stations that are already connected are selected in the order of the number of wireless stations having the smallest number.
(A5) The interference is selected in descending order of the amount of interference that can be added until the required C / I (Carrier to Interference Ratio) does not fall below.
[0039]
When the wireless station to be registered is not the master station, the selection of the new wireless station or the registered partner station as the master station depends on one or a combination of the following criteria B.
[0040]
Standard B
(B1) A new wireless station is set as a master station.
(B2) The wireless station to be registered is the master station.
(B3) In the case of a mobile radio station, the radio station with the larger battery capacity is the master station.
(B4) The wireless station with the smaller number of channels used is the master station.
(B5) The wireless station with the smaller amount of interference is the master station.
[0041]
In FIG. 7, a wireless station to be newly registered performs carrier sensing on all frequency channels for a fixed time (F1). If the received signal levels of the start notification packet, the transmission request packet, and the end notification packet exceed the threshold value as a result of performing the carrier sense, the information is written into the frequency channel and the connected wireless station table. In this table, the received power level from the radio station on the channel, the interference power level from other radio stations on the channel, and whether the radio station is operating as a master station managing the frequency on the channel Is written as whether it is operating as a slave station that is not the master station. As a result, it is detected whether or not there is a master station in the vicinity (F3). When a plurality of master stations are detected (F5), one master station is selected based on the criterion A (F7).
[0042]
Next, it is determined whether or not the new wireless station can operate as a slave station on the channel of the selected master station, for example, by measuring whether or not the amount of interference is equal to or less than an allowable value (F9, F15). ). If it can operate as a slave station, it is registered as a slave station (F11, F17), and the registration flow ends (F19).
[0043]
If it is determined in F9 that the operation as a slave station is impossible, if the search for all master stations is not completed (F13), the operations of F9 and F11 are repeated, and the master station that can be registered as a slave station is If it is detected, it is registered as a slave station with the master station.
[0044]
When there are a plurality of master stations in the vicinity of the new registration station and all the master stations wish to register on each channel, instead of registering as a slave station in F11 and ending (F19), Proceed to F13 and try to register to another master station by F9 and F11.
[0045]
When a master station is not detected in the vicinity by F1 carrier sense, when it is determined that operation as a slave station is impossible in F15, and when it is not possible to register as a slave station even when searching for all master stations in F13 , F21 to search for nearby wireless stations and their available channels. This search is performed by detecting a communication request packet or an end notification packet. Here, when a plurality of wireless stations are detected, one wireless station is selected based on the criterion A.
[0046]
When a nearby wireless station and a vacant channel are detected in F21, it is determined whether communication is possible using the vacant channel by, for example, measuring the amount of interference (F23). If it is determined in F23 that communication is possible, the process proceeds to F29, where it is determined whether the new wireless station is to be a master station or a slave station based on the reference B, and registration is performed in F17.
[0047]
If it is determined in F23 that communication is not possible, it is determined whether communication with another wireless station through a channel is possible (F23, F25). If communication is not possible with all wireless stations and channels, registration fails (F27).
[0048]
【The invention's effect】
When an autonomous decentralized access method is used in a multi-hop wireless packet communication network in which a plurality of wireless stations exist, delay, delay fluctuation and throughput deteriorate, and QoS cannot be guaranteed. A parent system that performs centralized control by applying a controlled access method or an access method in which a centralized control access method and an autonomous decentralized access method are applied in a time-divided manner to multi-hop wireless packet communication using a plurality of channels. The station can be determined for each channel, and the delay and delay fluctuation can be reduced, the throughput can be improved, and the QoS can be guaranteed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a channel for packet relay in the present invention.
FIG. 2A is a first packet processing sequence example in the present invention.
FIG. 2B is an example of arrangement of transmitting and receiving radio stations corresponding to FIG. 2A.
FIG. 3A is an example of a second packet processing sequence in the present invention.
FIG. 3B is an example of the arrangement of transmitting and receiving radio stations corresponding to FIG. 3A.
FIG. 4A is a third packet processing sequence example in the present invention.
FIG. 4B is an example of the arrangement of transmitting and receiving radio stations corresponding to FIG. 4A.
FIG. 5A is a fourth packet processing sequence example in the present invention.
FIG. 5B is an example of arrangement of transmitting and receiving radio stations corresponding to FIG. 5A.
FIG. 6 is an arrangement example of a wireless channel according to the present invention.
FIG. 7 shows a flow of an operation for registering a new wireless station in a network.
[Explanation of symbols]
a to d wireless channel 11 to 54 wireless station 61 to 93 range of radio wave 101 to 131 start notification packet 201 to 232 communication request packet 301 to 331 POLL packet 401 to 432 data packet 501 to 531 ACK + POLL packet 601 to 633 end notification packet 711-731 Registration request packet 811-831 Registration confirmation packet

Claims (12)

複数の無線局を有し、
各無線局はパケット無線通信のための複数の無線通信手段を有し、
各無線局はパケット無線通信のための複数の無線チャネルを用いる無線通信システムにおいて、
各無線局は、自局内の通信手段間で信号を中継する手段を有し、
無線局は、各無線チャネル毎に、適応的に、送信権を管轄し自局の制御に従って信号を伝送する親局、又は、親局の制御に従って信号を伝送する子局として動作する手段を有し
各無線局は他の無線局と1つ以上の無線局を介して通信する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継することを特徴とする無線通信システム。
Has multiple radio stations,
Each wireless station has a plurality of wireless communication means for packet wireless communication,
In a wireless communication system using a plurality of wireless channels for packet wireless communication ,
Each wireless station has a means for relaying a signal between communication means in its own station,
Each radio station for each radio channel, adaptively, the master station for transmitting a signal according to the control of jurisdiction and the local station transmission rights, or the means for operating as a slave station which transmits a signal under control of the master station Has ,
When each wireless station communicates with another wireless station via one or more wireless stations, the signal is relayed by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel. A wireless communication system, comprising:
複数の無線局を有し、
各無線局はパケット無線通信のための複数の無線通信手段を有し、
各無線局はパケット無線通信のための複数の無線チャネルを用いる無線通信システムにおいて、
各無線局は、自局内の通信手段間で信号を中継する手段を有し、
各無線局は、各無線チャネル毎に、適応的に、送信権を管轄し自局の制御に従って信号を伝送する親局、又は、親局の制御に従って信号を伝送する子局として動作する手段を有し、
さらに自律分散アクセスで動作する手段を有し、
各無線局は他の無線局と1つ以上の無線局を介して通信する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継することを特徴とする無線通信システム。
Has multiple radio stations,
Each wireless station has a plurality of wireless communication means for packet wireless communication,
In a wireless communication system using a plurality of wireless channels for packet wireless communication,
Each wireless station has a means for relaying a signal between communication means in its own station,
Each radio station adaptively controls a transmission right for each radio channel and transmits a signal under the control of its own station, or a means that operates as a slave station that transmits a signal under the control of the master station. Have
Furthermore, it has means for operating with autonomous decentralized access,
When each wireless station communicates with another wireless station via one or more wireless stations, the signal is relayed by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel. A wireless communication system, comprising:
無線局があるチャネルで集中制御アクセスの親局として動作するとき、該親局は集中制御アクセスの開始を示す「開始通知パケット」を送信し、該開始通知パケットは当該親局のアドレスと、当該親局に属する全ての子局のアドレスと、各子局が該開始通知パケットに応答して「通信要求パケット」を親局に送信するまでの時間をふくみ、前記開始通知パケットを受信した各子局は開始通知パケットで指定された時刻に「通知要求パケット」を前記親局に送信する、請求項1に記載の無線通信システム。When a wireless station operates as a master station for centralized control access on a certain channel, the master station transmits a “start notification packet” indicating the start of centralized control access, and the start notification packet includes the address of the master station and the Include the addresses of all slave stations belonging to the master station and the time required for each slave station to transmit a “communication request packet” to the master station in response to the start notification packet. The wireless communication system according to claim 1, wherein the station transmits a "notification request packet" to the master station at a time designated by a start notification packet. あるチャネルで集中制御アクセスの親局と子局の関係で動作している無線局が、集中制御アクセスを終了するとき、親局は集中制御アクセスの終了を示す「終了通知パケット」を送信し、該終了通知パケットは集中制御アクセスの終了時刻と次の開始通知パケットが送信されるまでの時間と、該終了通知パケットを受信した子局が該終了通知パケットを他の子局に向けて中継すべきか否かの情報をふくみ、終了通知パケットを受信した子局は該終了通知パケットで通知された終了時刻に前記「終了通知パケット」を親局に送信する請求項3記載の無線通信システム。When a radio station operating in a relationship between a master station and a slave station of centralized control access on a certain channel ends the centralized control access, the master station transmits an “end notification packet” indicating the end of the centralized control access, The end notification packet includes the end time of the centralized control access, the time until the next start notification packet is transmitted, and the slave station receiving the end notification packet should relay the end notification packet to another slave station. 4. The wireless communication system according to claim 3, wherein the slave station receiving the end notification packet includes information on whether or not the slave station transmits the "end notification packet" to the master station at the end time notified by the end notification packet. 各無線局はチャネル毎に一定時間のキャリアセンスを行い、
親局からの開始通知パケットを受信したときは、当該チャネルにおいて前記親局に従属する子局として動作し、
親局からの開始通知パケットを受信せず子局からの通信要求パケットを受信したときは、当該チャネルにおいて前記親局による集中制御アクセスが行われている間は送信を禁止する送信禁止局として動作し、その後親局又は子局から終了通知パケットを受信したときは、該終了通知パケットに記載される次の開始通知パケットの時刻までの間自律分散アクセスにより送信を行うこともでき
親局からの開始通知パケットを受信せず、かつ前記通信要求パケットを受信しないときは、当該チャネルで集中制御アクセスの親局として動作する、請求項1記載の無線通信システム。
Each radio station performs carrier sense for a certain time for each channel,
When receiving a start notification packet from the master station, it operates as a slave station subordinate to the master station in the channel,
When a communication request packet is received from a slave station without receiving a start notification packet from the master station, the station operates as a transmission prohibition station that prohibits transmission while the central station performs centralized control access on the channel. Then, when an end notification packet is received from the master station or a slave station, transmission can be performed by autonomous decentralized access until the time of the next start notification packet described in the end notification packet,
The wireless communication system according to claim 1, wherein the wireless communication system operates as a master station for centralized control access on the channel when the start notification packet from the master station is not received and the communication request packet is not received.
複数の無線局によって構成される無線ネットワークにおける無線局装置において、In a wireless station device in a wireless network configured by a plurality of wireless stations,
各無線局装置は無線通信のための複数のチャネルを有し、  Each wireless station device has a plurality of channels for wireless communication,
各無線局装置は集中制御アクセスにおける送信権を管轄する親局、親局に管理される子局、又は送信禁止局として動作可能であり、  Each wireless station device can operate as a master station having control over the transmission right in the centralized control access, a slave station managed by the master station, or a transmission prohibition station,
他の無線局間の通信を中継する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継することを特徴とする無線局装置。  When relaying communication between other wireless stations, the wireless station apparatus relays signals by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel.
複数の無線局によって構成される無線ネットワークにおける無線局装置において、
各無線局装置は無線通信のための複数のチャネルを有し、
各無線局装置は集中制御アクセスにおける送信権を管轄する親局、親局に管理される子局、又は送信禁止局として動作可能であり、さらに自律分散アクセスで動作可能であり、
他の無線局間の通信を中継する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継することを特徴とする無線局装置。
In a wireless station device in a wireless network configured by a plurality of wireless stations,
Each wireless station device has a plurality of channels for wireless communication,
The master station each wireless station apparatus that has jurisdiction over the transmission right in centralized control access, the slave station that is managed in the master station, or may operate as a transmission inhibited station, Ri operable der still autonomous distributed access,
When relaying communication between other wireless stations , a wireless station apparatus relays a signal by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel .
複数の無線局を有し、
各無線局はパケット無線通信のための複数の無線通信手段を有し、
各無線局はパケット無線通信のための複数の無線チャネルを用いる無線通信方法において、
各無線局は、自局内の通信手段間で信号を中継する手段を有し、
無線局は、各無線チャネル毎に、適応的に、送信権を管轄し自局の制御に従って信号を伝送する親局、又は、親局の制御に従って信号を伝送する子局として動作する手段を有し
各無線局は他の無線局と1つ以上の無線局を介して通信する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継することを特徴とする無線通信方法。
Has multiple radio stations,
Each wireless station has a plurality of wireless communication means for packet wireless communication,
Each wireless station is a wireless communication method using a plurality of wireless channels for packet wireless communication ,
Each wireless station has a means for relaying a signal between communication means in its own station,
Each radio station for each radio channel, adaptively, the master station for transmitting a signal according to the control of jurisdiction and the local station transmission rights, or the means for operating as a slave station which transmits a signal under control of the master station Has ,
When each wireless station communicates with another wireless station via one or more wireless stations, the signal is relayed by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel. A wireless communication method.
複数の無線局を有し、
各無線局はパケット無線通信のための複数の無線通信手段を有し、
各無線局はパケット無線通信のための複数の無線チャネルを用いる無線通信方法において、
各無線局は、自局内の通信手段間で信号を中継する手段を有し、
各無線局は、各無線チャネル毎に、適応的に、送信権を管轄し自局の制御に従って信号を伝送する親局、又は、親局の制御に従って信号を伝送する子局として動作する手段を有し、
さらに自律分散アクセスで動作する手段を有し、
各無線局は他の無線局と1つ以上の無線局を介して通信する際には、無線チャネル毎に定められた親局と子局間の通信チャネルを用いた集中制御アクセスにより信号を中継することを特徴とする無線通信方法。
Has multiple radio stations,
Each wireless station has a plurality of wireless communication means for packet wireless communication,
Each wireless station is a wireless communication method using a plurality of wireless channels for packet wireless communication,
Each wireless station has a means for relaying a signal between communication means in its own station,
Each radio station adaptively controls a transmission right for each radio channel and transmits a signal under the control of its own station, or a means that operates as a slave station that transmits a signal under the control of the master station. Have
Furthermore, it has means for operating with autonomous decentralized access,
When each wireless station communicates with another wireless station via one or more wireless stations, the signal is relayed by centralized control access using a communication channel between a master station and a slave station defined for each wireless channel. A wireless communication method.
無線局があるチャネルで集中制御アクセスの親局として動作するとき、該親局は集中制御アクセスの開始を示す「開始通知パケット」を送信し、該開始通知パケットは当該親局のアドレスと、当該親局に属する全ての子局のアドレスと、各子局が該開始通知パケットに応答して「通信要求パケット」を親局に送信するまでの時間をふくみ、前記開始通知パケットを受信した各子局は開始通知パケットで指定された時刻に「通知要求パケット」を前記親局に送信する、請求項8に記載の無線通信方法。When a wireless station operates as a master station for centralized control access on a certain channel, the master station transmits a “start notification packet” indicating the start of centralized control access, and the start notification packet includes the address of the master station and the Include the addresses of all slave stations belonging to the master station and the time required for each slave station to transmit a “communication request packet” to the master station in response to the start notification packet. The wireless communication method according to claim 8, wherein the station transmits a "notification request packet" to the master station at a time designated by a start notification packet. あるチャネルで集中制御アクセスの親局と子局の関係で動作している無線局が、集中制御アクセスを終了するとき、親局は集中制御アクセスの終了を示す「終了通知パケット」を送信し、該終了通知パケットは集中制御アクセスの終了時刻と次の開始通知パケットが送信されるまでの時間と、該終了通知パケットを受信した子局が該終了通知パケットを他の子局に向けて中継すべきか否かの情報をふくみ、終了通知パケットを受信した子局は該終了通知パケットで通知された終了時刻に前記「終了通知パケット」を親局に送信する請求項10記載の無線通信方法。When a radio station operating in a relationship between a master station and a slave station of centralized control access on a certain channel ends the centralized control access, the master station transmits an “end notification packet” indicating the end of the centralized control access, The end notification packet includes the end time of the centralized control access, the time until the next start notification packet is transmitted, and the slave station receiving the end notification packet should relay the end notification packet to another slave station. The wireless communication method according to claim 10, wherein the slave station receiving the end notification packet, including information on whether or not the mobile station transmits the "end notification packet" to the master station at the end time notified by the end notification packet. 各無線局はチャネル毎に一定時間のキャリアセンスを行い、
親局からの開始通知パケットを受信したときは、当該チャネルにおいて前記親局に従属する子局として動作し、
親局からの開始通知パケットを受信せず子局からの通信要求パケットを受信したときは、当該チャネルにおいて前記親局による集中制御アクセスが行われている間は送信を禁止する送信禁止局として動作し、その後親局又は子局から終了通知パケットを受信したときは、該終了通知パケットに記載される次の開始通知パケットの時刻までの間自律分散アクセスにより送信を行うこともでき、
親局からの開始通知パケットを受信せず、かつ前記通信要求パケットを受信しないときは、当該チャネルで集中制御アクセスの親局として動作する、請求項8記載の無線通信方法。
Each radio station performs carrier sense for a certain time for each channel,
When receiving a start notification packet from the master station, it operates as a slave station subordinate to the master station in the channel,
When a communication request packet is received from a slave station without receiving a start notification packet from the master station, the station operates as a transmission prohibition station that prohibits transmission while the central station performs centralized control access on the channel. Then, when an end notification packet is received from the master station or a slave station, transmission can be performed by autonomous decentralized access until the time of the next start notification packet described in the end notification packet ,
9. The wireless communication method according to claim 8, wherein when not receiving a start notification packet from a master station and not receiving the communication request packet, the wireless communication apparatus operates as a master station for centralized control access on the channel.
JP2002043120A 2001-02-21 2002-02-20 Wireless communication system, wireless communication method, and wireless station Expired - Fee Related JP3599032B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002043120A JP3599032B2 (en) 2001-02-21 2002-02-20 Wireless communication system, wireless communication method, and wireless station

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001044874 2001-02-21
JP2001-44874 2001-02-21
JP2002043120A JP3599032B2 (en) 2001-02-21 2002-02-20 Wireless communication system, wireless communication method, and wireless station

Publications (2)

Publication Number Publication Date
JP2002325273A JP2002325273A (en) 2002-11-08
JP3599032B2 true JP3599032B2 (en) 2004-12-08

Family

ID=26609802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002043120A Expired - Fee Related JP3599032B2 (en) 2001-02-21 2002-02-20 Wireless communication system, wireless communication method, and wireless station

Country Status (1)

Country Link
JP (1) JP3599032B2 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004254048A (en) * 2003-02-19 2004-09-09 Nippon Telegr & Teleph Corp <Ntt> Method for constructing multihop radio network
EP1833197B1 (en) * 2004-12-21 2011-09-07 Panasonic Corporation Power management method of wireless nodes
JP4635773B2 (en) * 2005-08-03 2011-02-23 日本電気株式会社 Wireless multi-hop network, communication terminal apparatus, channel reservation method used therefor, and program thereof
JP4871696B2 (en) 2006-10-27 2012-02-08 キヤノン株式会社 COMMUNICATION PARAMETER SETTING METHOD, COMMUNICATION DEVICE, COMMUNICATION DEVICE CONTROL METHOD, PROGRAM
JP4888431B2 (en) * 2007-03-26 2012-02-29 株式会社富士通ゼネラル Radio communication system and relay method in radio communication system
JP2011109412A (en) * 2009-11-17 2011-06-02 Mitsubishi Electric Corp Node device, ad hoc network system, and method of participating in network
EP2432257B1 (en) * 2010-07-02 2014-01-22 Panasonic Corporation Communication apparatus
CN103098518B (en) * 2010-09-09 2016-04-27 松下电器产业株式会社 Wireless communication system
JP5591197B2 (en) * 2011-09-08 2014-09-17 キヤノン株式会社 Communication device for executing communication parameter setting procedure, communication device control method, and program
US9232539B2 (en) 2012-02-20 2016-01-05 Mitsubishi Electric Corporation Communication system, communication terminal, and communication method
US9722688B2 (en) 2013-03-08 2017-08-01 Hitachi, Ltd. Wireless transport system
JP5858966B2 (en) * 2013-09-24 2016-02-10 キヤノン株式会社 Communication device for executing communication parameter setting procedure, communication device control method, and program

Also Published As

Publication number Publication date
JP2002325273A (en) 2002-11-08

Similar Documents

Publication Publication Date Title
US6934554B2 (en) Radio communication system
JP4959842B2 (en) Method for communicating in a wireless network including a plurality of nodes
US6928061B1 (en) Transmission-scheduling coordination among collocated internet radios
US8300626B2 (en) Path shortening in a wireless mesh network
US8331311B2 (en) Distributed channel hopping method in wireless ad-hoc network
US8243699B2 (en) Multi-channel MAC method for WLAN devices with a single radio interface and system for implementing the same
US7190686B1 (en) Self configuring high throughput medium access control for wireless networks
JP4783788B2 (en) Method and system for releasing unused reserved time, and wireless device
CN114208388A (en) Multi-link communication for wireless networks
JP2009530902A (en) Distributed wireless media access control protocol for ad hoc networks
TWI472257B (en) Communication system, communication terminal and communication method
JP2007266697A (en) Wireless communication method, wireless communication apparatus, and wireless communication program
US20070081485A1 (en) Method,station and computer programme for accessing radio resources in and ad-hoc radio communication system
Marina et al. RBRP: A robust broadcast reservation protocol for mobile ad hoc networks
JP2008511242A (en) Wireless network device and channel moving method using the same
JP3599032B2 (en) Wireless communication system, wireless communication method, and wireless station
JP2010524360A (en) Frequency scanning to form a communication network
WO2007008174A1 (en) Method and system of wireless communication between devices
JP3925425B2 (en) Wireless multi-hop network configuration method
JP2007510372A (en) Method and apparatus for route discovery in a communication system
US20050169221A1 (en) Decentralized bandwidth reservation mechanism for wireless networks
KR20050080847A (en) Wireless communication method
JP6526852B2 (en) Simultaneous transmit and receive operation in WLAN
KR101152932B1 (en) Wireless channel coexistence system using active channel reservation in wlan and wpan and method thereof
JP5213862B2 (en) Wireless network

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040308

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040323

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20040519

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20040824

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20040906

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080924

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080924

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090924

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090924

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100924

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100924

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110924

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120924

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130924

Year of fee payment: 9

LAPS Cancellation because of no payment of annual fees