JP2004247919A - Method for establishing synchronous automatic link - Google Patents

Method for establishing synchronous automatic link Download PDF

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JP2004247919A
JP2004247919A JP2003035042A JP2003035042A JP2004247919A JP 2004247919 A JP2004247919 A JP 2004247919A JP 2003035042 A JP2003035042 A JP 2003035042A JP 2003035042 A JP2003035042 A JP 2003035042A JP 2004247919 A JP2004247919 A JP 2004247919A
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Prior art keywords
station
line
synchronization
control station
link
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JP3747245B2 (en
Inventor
Hideyuki Domon
英之 土門
Takafumi Nojima
孝文 野嶌
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Japan Steel Works Ltd
Technical Research and Development Institute of Japan Defence Agency
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Japan Steel Works Ltd
Technical Research and Development Institute of Japan Defence Agency
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Abstract

<P>PROBLEM TO BE SOLVED: To simultaneously establish a synchronous and a line links with a plurality of subsidiary stations and to speed up re-establishment of the line link. <P>SOLUTION: By performing procedures of scan reception (I) and transmission reception synchronous establishment (II) first, synchronization of the respective subsidiary stations (A to C) with a control station is established. The control station performs frequency selection (IV) on the basis of a result of line quality evaluation (III) and forms a circuit connection by using the selected frequency (V). Even after line disconnection (VII), the synchronization of the respective subsidiary stations (A to C) with the control station is maintained. At the time of link re-establishment (VIII), as it is allowed to start with the line quality evaluation (III), quick line re-establishment is possible. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、統制局に対する各従属局の同期を確立した上で、統制局と各従属局との間の回線リンクを確立する同期型自動リンク確立（ＡＬＥ）方法に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
従来における同期型ＡＬＥでは、統制局に対する従属局の同期及び回線リンクの確立を、従属局毎に個別に実行するようにしていた。従って、従属局がｎ局あるなら統制局は同期型ＡＬＥに係る各手順を最低ｎ回繰り返さねばならなかった。また、一旦回線リンクを切断してしまうと、統制局に対する各従属局の同期状態が非同期状態に復原してしまうため、回線リンクを再び確立するときにも同期確立動作を実行せねばならなかった。この場合も、統制局は、従属局個数に応じた回数だけ同期型ＡＬＥに係る手順を繰り返さねばならない。
【０００３】
本発明は、このような問題点を解決することを課題としてなされたものであり、複数の従属局に対して一括的に同期及び回線リンクを確立でき、かつそれらを再確立する際には一部の手順を省略できるようにすることによって、同期・リンク（再）確立所要時間を短縮することを、その目的の一つとしている。
【０００４】
【課題を解決するための手段】
この様な目的を達成するために、本発明に係る同期型ＡＬＥ方法は、（１）初期的には相互に非同期である複数の従属局に対し、複数の回線を順繰りに用いて統制局から信号を送信し、その信号を基準として統制局に対する各従属局の同期を確立する第１の手順と、（２）各従属局が統制局に同期している状態を保ちつつ、上記複数の回線の中からいずれかを統制局から各従属局に対して指定し、各従属局が指定された回線に接続することにより、各従属局と統制局との間の回線リンクを確立する第２の手順と、（３）回線リンクが切断された後も各従属局が統制局に対する同期を保持し又は同期タイミングに関する情報を保持し、回線リンクが切断された後にいずれかの回線による回線リンクを再確立する際には当該同期を引き続き保持し又は当該保持している情報を利用して同期を確立する第３の手順とを有することを特徴とする。
【０００５】
このように、本発明においては、第１の手順において複数の従属局に関し統制局との同期及び回線リンクがほぼ一斉に確立されるため、各従属局毎に統制局との同期及び回線リンクを確立する手法に比べ、同期及び回線リンクを確立するのに要する合計の時間が短縮される。更に、回線リンクが保持された後も、各従属局が、統制局に対する同期を保持している（又は同期タイミングに関する情報を保持している）。従って、回線リンクを一旦解放した後、いずれかの回線による回線リンクを確立するに当たって、同期確立のための第１の手順から始める必要はなく、回線リンク確立のための第２の手順（好ましくは回線品質評価及び回線選択の手順を含む）から始めることができる。そのため、回線リンクの再確立を短時間で実行可能である。
【０００６】
【発明の実施の形態】
以下、本発明の好適な実施の形態に関し図面に基づき説明する。
【０００７】
図１に、本発明に係る通信システムにおける局の一例構成を示す。この図に示す局は、従属局（或いは統制局の無線インタフェース部分）として用いられるものであり、制御器およびデータ端末（以下「端末」と略称）１０と無線機１２との間にＡＬＥモデム１４及びデータモデム１６を設けた構成を有している。端末１０は使用者等から与えられる情報をデータとしてデータモデム１６に供給し、データモデム１６はこれを所定の変調方式（例えばＦＳＫ）に従い変調して無線機１２に供給し、無線機１２は変調後の信号を他の局へと無線送信する。無線機１２は、他の局からの信号を無線受信しデータモデム１６に供給し、データモデム１６はこの信号を所定の変調方式に従い復調してデータとして端末１０に供給し、端末１０はこのデータに基づき使用者等に対し情報を出力・供給する。また、図１に示した局では、統制局・従属局間の同期・回線リンクを確立するため、データモデム１６とは別にＡＬＥモデム１４を設けている。端末１０は、使用者からの要求や所定時間の到来・経過等、所定のイベントの発生に応じてＡＬＥモデム１４を動作させ、ＡＬＥモデム１４及び無線機１２を用いてスキャン受信等を実行する。なお、図中の１８は無線機１２のアンテナであり、他の局との通信に使用される。
【０００８】
統制局・従属局間の同期・回線リンクを確立するための手順の一例を、図２に示す。この図に示す例では、同期・回線リンクの確立に使用できる回線を周波数ｆ１〜ｆ３の３通り、準備してある。システムを構成する全ての局は、初期的には非同期の状態で、それぞれスキャン受信を実行している（Ｉ）。スキャン受信とは、図示される如く、各回線における信号の有無を回線毎に順繰りに調べるための受信動作であり、“非同期”とは各従属局が受信している周波数が瞬時的に見て一般に一致していないことをさす。
【０００９】
この状態から各従属局を統制局に同期させる際には、統制局が、各回線を順繰りに使用して同期確立のための所定の信号を送信する（ＩＩ）。各回線におけるその信号の送信時間は、１回線分のスキャン受信に要する時間に比べ長く設定しておく。各従属局は、状態Ｉに引き続いてスキャン受信を継続しているため、かかる設定の下では、統制局からの信号の送信が全回線を一巡する間に、全ての従属局が統制局からの信号を受信できる。即ち、各従属局は、状態ＩＩが終了するまでには、統制局からの信号に同期しそれを聴取できる同期状態となる。統制局としては信号送信を一巡させるのみでよいため、そのために要する時間は、従属局毎に同期を確立した場合に比べ短くなる。
【００１０】
統制局からの信号の送信が全回線を一巡した時点、即ち統制局に対する各従属局の同期が確立された時点で、統制局は、各回線を順繰りに用いて、回線品質評価のための送受信を実行する（ＩＩＩ）。即ち、まず、統制局は周波数ｆ１の回線を用いて各従属局に対し信号を送信し、各従属局はこの信号を受信しその結果を従属局Ａ、Ｂ、Ｃの順で順繰りに統制局に返信する。この通信を、周波数を変え全回線について順繰りに実行することで、統制局は、全回線の品質を回線毎かつ従属局毎に知ることができる。統制局は、この様にして取得した回線品質に関する情報に基づき、もっとも多くの従属局との（良質な）通信を確保できる回線を選び（図では周波数ｆ３の回線）（ＩＶ）、その回線を使用する旨を各従属局に知らせ各従属局から順繰りに応答を受け取る（Ｖ）。これによって統制局・従属局間の回線リンクが確立され、その回線を使用した通信が開始される（ＶＩ）。
【００１１】
通信が終わると回線リンクが切断される（ＶＩＩ）。図示されている例では、使用している回線を介して統制局から所定の信号を送信しそれに対する各従属局の応答を統制局が順繰りに受け取ることにより回線が解放される。この後、統制局及び各従属局は、スキャン受信状態に移るものの、状態Ｉとは異なり、統制局に対する各従属局の同期は保たれている。即ち、各従属局が、統制局に対する同期を引き続き保持しており（又は同期タイミングに関する情報を記憶しており）、そのためスキャン受信状態とは言っても非同期でのスキャン受信とはならない。従って、この状態から再度回線リンクを確立する際には、状態ＩＩに係る手順即ち同期確立手順を省略して直ちに状態ＩＩＩに係る手順即ち回線品質評価手順に移行できる（ＶＩＩＩ）。そのため、回線リンクの再確立に要する時間は短くなる。
【００１２】
【発明の効果】
以上説明したように、本発明に係る同期型自動リンク確立方法によれば、複数の従属局に対して一括的に同期及び回線リンクを確立でき、かつそれらを再確立する際には一部の手順を省略できるようにすることによって、同期・リンク（再）確立所要時間を短縮可能な効果がある。
【図面の簡単な説明】
【図１】本発明の一実施の形態における各局の一例構成を示すブロック図である。
【図２】本実施の形態における同期型ＡＬＥ（自動リンク確立）の流れを示すタイミングチャートである。
【符号の説明】
１０ 端末
１２ 無線機
１４ ＡＬＥモデム
１６ データモデム
１８ アンテナ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a synchronous automatic link establishment (ALE) method for establishing a line link between a control station and each dependent station after establishing synchronization of each dependent station with a control station.
[0002]
Problems to be solved by the prior art and the invention
In the conventional synchronous ALE, synchronization of a dependent station with respect to a control station and establishment of a circuit link are individually performed for each dependent station. Therefore, if there are n dependent stations, the control station has to repeat each procedure related to the synchronous ALE at least n times. In addition, once the line link is disconnected, the synchronization state of each dependent station with respect to the control station is restored to the asynchronous state. Therefore, when the line link is re-established, the synchronization establishing operation must be performed. . In this case as well, the control station must repeat the procedure related to the synchronous ALE a number of times corresponding to the number of the dependent stations.
[0003]
SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and can establish synchronization and a circuit link for a plurality of subordinate stations collectively. It is an object of the present invention to reduce the time required for establishing a synchronization / link (re) establishment by making it possible to omit the procedure of the section.
[0004]
[Means for Solving the Problems]
In order to achieve such an object, the synchronous ALE method according to the present invention provides: (1) a plurality of subordinate stations which are initially asynchronous with each other by using a plurality of lines sequentially from the control station to the control station; A first procedure for transmitting a signal and establishing the synchronization of each dependent station with the control station based on the signal; and (2) maintaining the state in which each dependent station is synchronized with the control station while maintaining A second link that establishes a line link between each dependent station and the control station by designating one of the following from the control station to each dependent station and connecting each dependent station to the specified line. Procedures and (3) Even after the line link is disconnected, each dependent station retains synchronization with the control station or retains information on the synchronization timing, and re-establishes the line link by any one of the lines after the line link is disconnected. When establishing, keep the synchronization It is characterized by a third step for establishing synchronization by using the information that the holding.
[0005]
As described above, in the present invention, in the first procedure, the synchronization with the control station and the line link are established almost all at once with respect to the plurality of dependent stations, so that the synchronization and the line link with the control station are established for each dependent station. The total time required to establish a synchronization and line link is reduced as compared to the establishing method. Further, even after the line link is held, each dependent station holds synchronization with the control station (or holds information on synchronization timing). Therefore, once the line link is released, it is not necessary to start with the first procedure for establishing synchronization when establishing a line link by any of the lines, and it is not necessary to start with the second procedure for establishing the line link (preferably, (Including procedures for line quality evaluation and line selection). Therefore, re-establishment of the line link can be executed in a short time.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 shows an example configuration of a station in the communication system according to the present invention. The station shown in FIG. 1 is used as a dependent station (or a radio interface part of a control station), and an ALE modem 14 is provided between a controller and a data terminal (hereinafter abbreviated as “terminal”) 10 and a radio 12. And a data modem 16. The terminal 10 supplies information given by a user or the like as data to the data modem 16, which modulates the data according to a predetermined modulation method (for example, FSK) and supplies the data to the radio 12. The latter signal is wirelessly transmitted to another station. The radio device 12 receives a signal from another station by radio, and supplies it to the data modem 16. The data modem 16 demodulates this signal according to a predetermined modulation method and supplies it to the terminal 10 as data. The information is output and supplied to the user based on the information. In the station shown in FIG. 1, an ALE modem 14 is provided separately from the data modem 16 in order to establish a synchronization / line link between the control station and the dependent stations. The terminal 10 operates the ALE modem 14 in response to occurrence of a predetermined event such as a request from a user or arrival / elapse of a predetermined time, and executes scan reception and the like using the ALE modem 14 and the wireless device 12. Note that reference numeral 18 in the figure denotes an antenna of the wireless device 12, which is used for communication with another station.
[0008]
FIG. 2 shows an example of a procedure for establishing a synchronization / line link between the control station and the dependent stations. In the example shown in this drawing, three lines of frequencies f1 to f3 that can be used for establishing a synchronization / line link are prepared. All stations constituting the system are initially performing scan reception in an asynchronous state (I). Scan reception is a reception operation for sequentially checking the presence or absence of a signal on each line as shown in the figure, and "asynchronous" means that the frequency being received by each subordinate station is instantaneously determined. Generally refers to a disagreement.
[0009]
When synchronizing each dependent station with the control station from this state, the control station transmits a predetermined signal for establishing synchronization using each line in turn (II). The transmission time of the signal on each line is set longer than the time required for scan reception for one line. Since each dependent station continues scanning reception following the state I, under such a setting, all signal transmissions from the control station make all the dependent stations while the signal transmission from the control station makes a full circuit. Can receive signals. That is, each dependent station is in a synchronized state in which it can synchronize with and listen to the signal from the controlling station before the end of state II. Since the control station only needs to make a single round of signal transmission, the time required for that becomes shorter than when synchronization is established for each subordinate station.
[0010]
At a point in time when the signal transmission from the control station has made a complete circuit, that is, when synchronization of each dependent station with the control station has been established, the control station uses each line in turn to transmit and receive signals for evaluating line quality. (III). That is, first, the control station transmits a signal to each subordinate station using the line of the frequency f1, and each subordinate station receives this signal and transmits the result to the control station in order of the subordinate stations A, B, and C. Reply to By performing this communication repeatedly for all the lines while changing the frequency, the control station can know the quality of all the lines for each line and each subordinate station. The control station selects a line that can secure the (high-quality) communication with the most subordinate stations based on the information on the line quality acquired in this manner (in the figure, the line of the frequency f3) (IV), and selects the line. Each slave station is informed of the use, and a response is sequentially received from each slave station (V). As a result, a line link between the control station and the dependent station is established, and communication using the line is started (VI).
[0011]
When the communication ends, the line link is disconnected (VII). In the illustrated example, the line is released by transmitting a predetermined signal from the control station via the line being used, and receiving the response of each dependent station in response to the control station in turn. Thereafter, the control station and each dependent station move to the scan reception state, but, unlike state I, the synchronization of each dependent station with the control station is maintained. That is, each dependent station keeps synchronizing with the control station (or stores information on the synchronization timing), and therefore, scanning reception is not asynchronous even in the scan reception state. Therefore, when the line link is to be re-established from this state, the procedure relating to the state II, that is, the synchronization establishing procedure can be omitted, and the procedure immediately proceeds to the procedure relating to the state III, ie, the line quality evaluation procedure (VIII). Therefore, the time required to re-establish the line link is reduced.
[0012]
【The invention's effect】
As described above, according to the synchronous automatic link establishment method according to the present invention, synchronization and a circuit link can be collectively established for a plurality of subordinate stations, and when reestablishing them, some By making it possible to omit the procedure, there is an effect that the time required for establishing synchronization / link (re) estination can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an example configuration of each station according to an embodiment of the present invention.
FIG. 2 is a timing chart showing a flow of a synchronous ALE (automatic link establishment) in the present embodiment.
[Explanation of symbols]
10 Terminal 12 Radio 14 ALE Modem 16 Data Modem 18 Antenna

Claims (1)

初期的には相互に非同期である複数の従属局に対し、複数の回線を順繰りに用いて統制局から信号を送信し、その信号を基準として統制局に対する各従属局の同期を確立する第１の手順と、
各従属局が統制局に同期している状態を保ちつつ、上記複数の回線の中からいずれかを統制局から各従属局に対して指定し、各従属局が指定された回線に接続することにより、各従属局と統制局との間の回線リンクを確立する第２の手順と、
回線リンクが切断された後も各従属局が統制局に対する同期を保持し又は同期タイミングに関する情報を保持し、回線リンクが切断された後にいずれかの回線による回線リンクを再確立する際には、当該同期を引き続き保持し又は当該保持している情報を利用して同期を確立する第３の手順とを有することを特徴とする同期型自動リンク確立方法。Initially, a signal is transmitted from a control station to a plurality of dependent stations which are initially asynchronous with each other by using a plurality of lines in sequence, and a first signal for establishing synchronization of each dependent station with the control station based on the signal. Steps and
While keeping each slave station synchronized with the control station, specify any one of the plurality of lines from the control station to each slave station, and connect each slave station to the specified line. A second procedure for establishing a circuit link between each dependent station and the controlling station,
When each dependent station holds synchronization with the control station or holds information on synchronization timing even after the line link is disconnected, and when the line link is re-established by any line after the line link is disconnected, A third procedure for continuously maintaining the synchronization or establishing the synchronization using the stored information.
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JP2010532970A (en) * 2007-07-06 2010-10-14 クゥアルコム・インコーポレイテッド Method and apparatus for supporting multiple timing synchronizations corresponding to different communication peers
JP2010541307A (en) * 2007-09-14 2010-12-24 ソニー エリクソン モバイル コミュニケーションズ， エービー Automatic reconnection of previously lost connections in frequency hopping communication systems
US8385316B2 (en) 2007-07-06 2013-02-26 Qualcomm Incorporated Methods and apparatus related to peer to peer communications timing structure
US8601156B2 (en) 2007-07-06 2013-12-03 Qualcomm Incorporated Methods and apparatus related to peer discovery and/or paging in peer to peer wireless communications
US8599823B2 (en) 2007-07-06 2013-12-03 Qualcomm Incorporated Communications methods and apparatus related to synchronization with respect to a peer to peer timing structure
JP2017225076A (en) * 2016-06-17 2017-12-21 Ｎｅｃネットワーク・センサ株式会社 Communication device, communication system, channel determination method, and channel determination program

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