【０００１】[0001]
【産業上の利用分野】本発明は、構内無線通信システム
など１台の親局が複数台の子局と無線通信を行う無線通
信システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system in which one master station wirelessly communicates with a plurality of slave stations such as a local wireless communication system.
【０００２】[0002]
【従来の技術】この種の無線通信システムは、図６に示
すように、送信要求のある子局が任意のタイミングで親
局に対して通信要求信号を送信し、これに対して親局か
ら子局に接続応答を送信し、子局はこの応答が得られる
と親局とデータ通信を行う、いわゆるコンテンション方
式で無線通信を行うか、あるいは図７に示すように、親
局が送信するポーリング信号を基準として各子局に均等
に割当てられたタイムスロットに従って子局が一定の順
序で送信を行い、親局からは任意のタイミングで子局に
返信される、いわゆるポーリング方式で無線通信を行う
か、いずれかの方式で無線通信を行うものであった。2. Description of the Related Art In a wireless communication system of this type, a slave station having a transmission request transmits a communication request signal to a master station at an arbitrary timing as shown in FIG. The connection response is transmitted to the slave station, and when the response is obtained, the slave station performs data communication with the master station, that is, wireless communication by a so-called contention method, or the master station transmits as shown in FIG. Wireless communication by a so-called polling method, in which the slave stations transmit in a fixed order according to the time slots evenly assigned to each slave station based on the polling signal, and the master station replies to the slave stations at arbitrary timing. Either, or wireless communication is performed by either method.
【０００３】[0003]
【発明が解決しようとする課題】しかしながらコンテン
ション方式で無線通信を行うものでは、子局の数が増加
したり、送信要求頻度が増加すると、子局同士の送信が
衝突し通信のスループットが低下する問題があった。ま
たポーリング方式で無線通信を行うものでは、子局の数
が増加するとタイムスロットの順番が到来するまでの待
ち時間が長くなりやはり通信のスループットが低下する
問題があった。However, in the wireless communication by the contention method, if the number of slave stations increases or the frequency of transmission requests increases, the transmission between slave stations collides with each other and the communication throughput decreases. There was a problem to do. Further, in the wireless communication using the polling method, there is a problem that when the number of slave stations increases, the waiting time until the arrival of the time slot becomes long and the communication throughput also decreases.
【０００４】そこで本発明は、子局同士の送信衝突が頻
繁に発生する状態になるとポーリング方式で無線通信を
行い、子局同士の送信衝突が頻繁に発生する虞がないと
きにはコンテンション方式で無線通信を行うことによ
り、スループットの向上を図ることができる無線通信シ
ステムを提供しようとするものである。Therefore, according to the present invention, wireless communication is performed by the polling method when transmission collisions between the slave stations occur frequently, and wireless communication is performed by the contention method when there is no risk of frequent transmission collisions among the slave stations. An object of the present invention is to provide a wireless communication system capable of improving throughput by performing communication.
【０００５】[0005]
【課題を解決するための手段】請求項１対応の発明は、
親局と複数の子局からなる無線通信システムにおいて、
親局は、ある子局から送信要求があるとその子局に応答
を行ってからその子局とデータを送受信するコンテンシ
ョン方式で通信を行っている状態で複数の子局からの送
信要求の衝突回数をカウントする手段と、単位時間当り
の衝突回数が予め設定された規定値を越えると各子局に
対してプロトコル変更指示を送信してポーリング方式の
通信に切替える手段と、各子局にタイムスロット情報を
含むポーリング信号を送信し各子局がタイムスロットに
基づいてデータを順次送信するポーリング方式で通信を
行っている状態でタイムスロットに子局からのデータ受
信がない無効スロット数をカウントする手段と、単位時
間当りの無効スロット数が予め設定された規定値を越え
ると各子局に対してプロトコル変更指示を送信してコン
テンション方式の通信に切替える手段を設けたものであ
る。The invention according to claim 1 is
In a wireless communication system consisting of a master station and multiple slave stations,
When a master station receives a transmission request from a certain slave station, the master station responds to that slave station and then transmits and receives data to and from that slave station. Means for counting the number of collisions, a means for transmitting a protocol change instruction to each slave station and switching to polling communication when the number of collisions per unit time exceeds a preset specified value, and a time slot for each slave station. A means for counting the number of invalid slots in which no data is received from a slave station in a time slot while communicating by a polling method in which a polling signal including information is transmitted and each slave station sequentially transmits data based on a time slot When the number of invalid slots per unit time exceeds a preset specified value, a protocol change instruction is sent to each slave station and the contention system It is provided with a means for switching the signal.
【０００６】請求項２対応の発明は、請求項１におい
て、親局は、ポーリング方式の通信において送信要求頻
度の高い子局から順に多くのタイムスロットを与えるタ
イムスロット情報を含むポーリング信号を各子局に送信
するものである。In the invention according to claim 2, in the claim 1, the master station transmits a polling signal including time slot information which gives a large number of time slots in order from a slave station having a high transmission request frequency in polling communication. It is to be sent to the station.
【０００７】請求項３対応の発明は、請求項１又は２に
おいて、親局は、受信電界強度が規定値以上のときに受
信誤りビット数が予め設定された値をオーバしていると
衝突発生を判定するものである。In the invention according to claim 3, in the claim 1 or 2, the master station causes a collision when the number of reception error bits exceeds a preset value when the reception electric field strength is equal to or more than a specified value. Is determined.
【０００８】[0008]
【作用】このような構成の本発明においては、親局が複
数の子局に対してコンテンション方式で無線通信を行っ
ている状態で子局同士の送信衝突が頻繁に発生するよう
になると、親局は各子局にプロトコル変更指示を送信し
てポーリング方式の通信に切替える。また親局が複数の
子局に対してポーリング方式で通信を行っている状態で
タイムスロットに子局からのデータ受信がない無効スロ
ットが頻繁に発生するようになると、親局は各子局にプ
ロトコル変更指示を送信してコンテンション方式の通信
に切替える。また親局は、ポーリング方式の通信におい
て送信要求頻度の高い子局から順に多くのタイムスロッ
トを与える。さらに親局は、受信電界強度が規定値以上
のときに受信誤りビット数が予め設定された値をオーバ
していると衝突発生を判定する。In the present invention having such a structure, when the master station is performing radio communication with a plurality of slave stations by the contention system, transmission collisions between slave stations frequently occur, The master station sends a protocol change instruction to each slave station and switches to polling communication. Also, when a master station is communicating with multiple slave stations in a polling method and an invalid slot frequently occurs in which no data is received from the slave station in the time slot, the master station will be assigned to each slave station. It sends a protocol change instruction and switches to contention communication. Also, the master station gives many time slots in order from the slave station having the highest transmission request frequency in polling communication. Furthermore, the master station determines that a collision has occurred if the number of reception error bits exceeds a preset value when the received electric field strength is equal to or higher than a specified value.
【０００９】[0009]
【実施例】以下、本発明の実施例を図面を参照して説明
する。図１に示すように、親局１に対して第１、第２、
第３の子局２，３，４を配置して無線通信システムを形
成している。Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the first, second, and
The third slave stations 2, 3 and 4 are arranged to form a wireless communication system.
【００１０】前記親局１は前記各子局２〜４とコンテン
ション方式で無線通信を行っている状態では各子局２〜
４からの送信要求の衝突が発生するとその発生回数をカ
ウントするようになっている。（衝突回数カウント手
段）In the state where the master station 1 is wirelessly communicating with the slave stations 2 to 4 by the contention method, the slave stations 2 to 2 are connected.
When a collision of transmission requests from 4 occurs, the number of occurrences is counted. (Collision count counting means)
【００１１】そして単位時間当りの衝突回数が予め設定
された規定値を越えると前記親局１は各子局２〜４に対
してプロトコル変更指示Ｑ1 を送信してポーリング方式
の通信に切替えるようになっている。（ポーリング方式
への切替手段）When the number of collisions per unit time exceeds a preset specified value, the master station 1 sends a protocol change instruction Q1 to each slave station 2 to 4 to switch to polling communication. Is becoming (Switching method to polling method)
【００１２】例えば図２に示すように、第１の子局２か
ら親局１に送信要求が送信され、それに対して親局１か
ら第１の子局２に接続応答を送信して親局１と第１の子
局２とでデータ通信が行われ、その後第２の子局３から
の送信要求と第３の子局４からの送信要求が衝突した
り、第１の子局２からの送信要求と第２の子局３からの
送信要求が衝突したりなど送信要求の衝突が頻繁に発生
し、前記親局１のカウントする単位時間当りの衝突回数
が予め設定された規定値を越えると、親局１は各子局２
〜４に対してプロトコル変更指示Ｑ1 を送信する。そし
て親局１は各子局２〜４に対してポーリング信号Ｐを送
信する。For example, as shown in FIG. 2, a transmission request is transmitted from the first slave station 2 to the master station 1, and in response thereto, a connection response is transmitted from the master station 1 to the first slave station 2 and the master station is transmitted. 1 and the first slave station 2 perform data communication, and then the transmission request from the second slave station 3 and the transmission request from the third slave station 4 collide with each other, or from the first slave station 2 Of the transmission request from the second slave station 3 or the transmission requests from the second slave station 3 frequently collide, and the number of collisions per unit time counted by the master station 1 is set to a predetermined value. When crossing over, the parent station 1 becomes each child station 2
To protocol change instruction Q1. Then, the master station 1 transmits a polling signal P to each of the slave stations 2-4.
【００１３】これにより各子局２〜４は自局に割当てら
れたタイムスロット内での送信権を得る。これにより各
子局２〜４はタイムスロットに従って親局１に対してデ
ータ通信を行う。こうして衝突が頻繁に発生するときに
はポーリング通信を行うことにより確実なデータ通信が
でき通信効率を向上できる。As a result, each of the slave stations 2 to 4 obtains the transmission right within the time slot assigned to itself. As a result, the slave stations 2 to 4 perform data communication with the master station 1 according to the time slot. In this way, when collisions frequently occur, reliable data communication can be performed and communication efficiency can be improved by performing polling communication.
【００１４】前記親局１は各子局２〜４からの送信要求
の衝突を例えば図３に示す処理によって判定するように
なっている。すなわち各子局２〜４からの受信データを
チェックし、誤りビット数、すなわちエラー率を計算し
そのエラー率が規定値をオーバしているか否かを判断す
る。そしてエラー率が規定値をオーバしていると続いて
受信信号強度をチェックする。これは受信信号の強度が
低下したために発生したエラーなのか衝突のためのエラ
ーなのかを調べるためである。そして受信信号強度が予
め設定された規定値以上であれば衝突のためのエラーと
判定して衝突回数をカウントする。The master station 1 is adapted to judge the collision of transmission requests from the slave stations 2 to 4 by the processing shown in FIG. 3, for example. That is, the received data from each of the slave stations 2 to 4 is checked, the number of error bits, that is, the error rate is calculated, and it is determined whether or not the error rate exceeds a specified value. Then, if the error rate exceeds the specified value, the received signal strength is subsequently checked. This is to check whether it is an error caused by a decrease in the strength of the received signal or an error due to collision. If the received signal strength is equal to or higher than a preset specified value, it is determined that the error is due to a collision and the number of collisions is counted.
【００１５】前記親局１が各子局２〜４とポーリング方
式でデータの送受信を行う場合に、図４に示すように親
局１から各子局２〜４へのポーリング信号Ｐに、ビット
同期信号やフレーム同期信号と共にタイムスロット割当
てデータを乗せ、タイムスロット割当てデータとして例
えば第１の子局２のＩＤ（識別）コードとスロットＳ1
及びＳ3 、第２の子局３のＩＤコードとスロットＳ2 、
第３の子局４のＩＤコードとスロットＳ4 を入れておけ
ば、ポーリング信号Ｐにより第１の子局２との通信を行
った後第２の子局３との通信を行い、続いて再度第１の
子局２との通信を行った後第３の子局４との通信を行う
ことになる。従って第１の子局２に送信要求頻度の高い
子局を当てればより効率のよい無線通信ができる。When the master station 1 transmits / receives data to / from each slave station 2 to 4 by the polling method, a bit is added to the polling signal P from the master station 1 to each slave station 2 to 4 as shown in FIG. The time slot allocation data is added together with the synchronization signal and the frame synchronization signal, and as the time slot allocation data, for example, the ID (identification) code of the first slave station 2 and the slot S1.
, S3, the ID code of the second slave station 3 and the slot S2,
If the ID code of the third slave station 4 and the slot S4 are inserted, communication with the first slave station 2 is performed by the polling signal P, then communication with the second slave station 3 is performed, and then again. After communicating with the first slave station 2, communication with the third slave station 4 is performed. Therefore, if a slave station having a high transmission request frequency is applied to the first slave station 2, more efficient wireless communication can be performed.
【００１６】また親局１と各子局２〜４がポーリング方
式で無線通信を行っている状態では親局１は各子局２〜
４に与えたタイムスロットにおいて子局からのデータ受
信がない無効スロットが発生するとその無効スロット数
をカウントするようになっている。（無効スロット数カ
ウント手段）When the master station 1 and each of the slave stations 2 to 4 are performing wireless communication by the polling method, the master station 1 has each of the slave stations 2 to 2.
When an invalid slot in which no data is received from the slave station occurs in the time slot given to No. 4, the number of invalid slots is counted. (Invalid slot number counting means)
【００１７】そして単位時間当りの無効スロット数が予
め設定された規定値を越えると親局１は各子局２〜４に
対してプロトコル変更指示Ｑ2 を送信してコンテンショ
ン方式の通信に切替えるようになっている。（コンテン
ション方式への切替手段）When the number of invalid slots per unit time exceeds a preset specified value, the master station 1 sends a protocol change instruction Q2 to each slave station 2 to 4 to switch to contention communication. It has become. (Switching method to contention method)
【００１８】図５に示すように、親局１と各子局２〜４
がポーリング方式で無線通信を行っている状態で各子局
２〜４からの送信がない無効スロットが頻繁に発生する
と、親局１のカウントする単位時間当りの無効スロット
の発生回数が予め設定された規定値を越えるようにな
る。これにより親局１は各子局２〜４に対してプロトコ
ル変更指示Ｑ2 を送信し、以降通信方式はコンテンショ
ン通信に切換わる。As shown in FIG. 5, the master station 1 and each of the slave stations 2-4.
When wireless slots are used for wireless communication in the polling method and an invalid slot with no transmission from each slave station 2 to 4 frequently occurs, the number of invalid slot occurrences per unit time counted by the master station 1 is set in advance. The specified value will be exceeded. As a result, the master station 1 transmits the protocol change instruction Q2 to each of the slave stations 2 to 4, and thereafter the communication system is switched to contention communication.
【００１９】こうして各子局２〜４からの送信が頻繁に
発生しない状態ではコンテンション通信により送信要求
のある子局が任意に親局に対して送信要求信号を送信し
て親局１との間でデータ通信ができるようになる。従っ
て通信効率を向上できる。In this way, in the state where the transmission from each of the slave stations 2 to 4 does not occur frequently, the slave station having the transmission request by contention communication arbitrarily transmits a transmission request signal to the master station to communicate with the master station 1. Data can be communicated between them. Therefore, communication efficiency can be improved.
【００２０】このように各子局２〜４の状態に応じて通
信方式をコンテンション方式とポーリング方式とに切替
えて通信効率の向上を図っているので、スループットを
向上できる。As described above, the communication system is switched between the contention system and the polling system according to the states of the respective slave stations 2 to 4 to improve the communication efficiency, so that the throughput can be improved.
【００２１】[0021]
【発明の効果】以上詳述したように本発明によれば、子
局同士の送信衝突が頻繁に発生する状態になるとポーリ
ング方式で無線通信を行い、子局同士の送信衝突が頻繁
に発生する虞がないときにはコンテンション方式で無線
通信を行うことにより、スループットの向上を図ること
ができる無線通信システムを提供できるものである。As described in detail above, according to the present invention, when a collision of transmission between slave stations occurs frequently, wireless communication is performed by a polling method, and a collision of transmission between slave stations frequently occurs. It is possible to provide a wireless communication system capable of improving throughput by performing wireless communication by the contention method when there is no fear.
【図１】本発明の実施例を示すブロック図。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】同実施例における親局のコンテンション通信か
らポーリング通信へのプロトコロ変更制御を示す図。FIG. 2 is a diagram showing a protocol change control from contention communication to polling communication of a master station in the embodiment.
【図３】同実施例における親局の衝突判定処理を示す流
れ図。FIG. 3 is a flowchart showing a collision determination process of a master station in the embodiment.
【図４】同実施例におけるポーリング通信制御の一例を
示す図。FIG. 4 is a diagram showing an example of polling communication control in the embodiment.
【図５】同実施例における親局のポーリング通信からコ
ンテンション通信へのプロトコロ変更制御を示す図。FIG. 5 is a diagram showing a protocol change control from polling communication of the master station to contention communication in the embodiment.
【図６】従来の通信制御方式を示す図。FIG. 6 is a diagram showing a conventional communication control method.
【図７】従来の通信制御方式を示す図。FIG. 7 is a diagram showing a conventional communication control method.
１…親局、２〜４…子局。 1 ... Parent station, 2-4 ... Child station.
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|---|---|---|---|
| JP20442791AJPH0548610A (en) | 1991-08-14 | 1991-08-14 | Radio communication system |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20442791AJPH0548610A (en) | 1991-08-14 | 1991-08-14 | Radio communication system |
| Publication Number | Publication Date |
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| JPH0548610Atrue JPH0548610A (en) | 1993-02-26 |
| Application Number | Title | Priority Date | Filing Date |
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| JP20442791APendingJPH0548610A (en) | 1991-08-14 | 1991-08-14 | Radio communication system |
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