JP2953738B2 - Demand assignment method - Google Patents
Demand assignment methodInfo
- Publication number
- JP2953738B2 JP2953738B2 JP9304790A JP9304790A JP2953738B2 JP 2953738 B2 JP2953738 B2 JP 2953738B2 JP 9304790 A JP9304790 A JP 9304790A JP 9304790 A JP9304790 A JP 9304790A JP 2953738 B2 JP2953738 B2 JP 2953738B2
- Authority
- JP
- Japan
- Prior art keywords
- line
- call
- station
- central control
- control unit
- 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 - Lifetime
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Description
【発明の詳細な説明】 [発明の目的] (産業上の利用分野) この発明は、衛星通信や地上マイクロ波通信のよう
に、複数の従局が回線を介して通信を行い、集中制御局
が発呼局から送られてくる呼に応じて空き回線を割り当
てるデマンドアサインメント方式に関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) In the present invention, a plurality of slave stations communicate via a line, such as satellite communication and terrestrial microwave communication, and a central control station The present invention relates to a demand assignment system for allocating a free line according to a call sent from a calling station.
(従来の技術) このデマンドアサインメント方式の従来例としては、
特開昭62−1331号公報に示された方式が知られている。
この従来のデマンドアサインメント方式では、回線がす
べて閉塞されている状態においても発生した呼を受け付
けて保留し、回線の1つが空き次第に保留となっている
呼に当該回線を割り当てていた。(Prior art) As a conventional example of this demand assignment method,
A system disclosed in Japanese Patent Application Laid-Open No. 62-1331 is known.
In this conventional demand assignment method, a call that has occurred is accepted and held even when all lines are blocked, and the line is assigned to a call that is on hold as soon as one of the lines becomes free.
(発明が解決しようとする課題) しかしながら、かかる手法では、保留時間が長くなる
と、発呼者は保留状態であることを忘れて端末から離れ
てしまうケースが生じ、この場合には回線が割り当てら
れても発呼者がいない状態、つまり、被呼者側からみる
と無限電話等がかかることになり、無駄な回線割り当て
がなされることになった。(Problems to be Solved by the Invention) However, in such a method, when the hold time is long, a case occurs in which the caller forgets that the call is on hold and leaves the terminal. In this case, the line is allocated. However, when there is no caller, that is, when viewed from the called party side, an infinite telephone call is made, and useless line allocation is performed.
また、保留状態の呼が複数である場合でも、時間的に
早く発生した呼から優先的に回線を割り当てていたた
め、緊急性が高い個が後回しにされるという問題点が生
じていた。Further, even when there are a plurality of calls in a hold state, a line that is generated earlier in time is preferentially assigned to a line, so that a problem with a higher urgency is postponed.
本発明は上記のような従来のデマンドアサインメント
方式の問題点を解決せんとしてなされたもので、その第
1の目的は、無駄な回線割り当てが生じることないデマ
ンドアサインメント方式を提供することであり、第2の
目的は、緊急性の高い呼に先に回線を割り当てることの
できるデマンドアサインメント方式を提供することであ
る。SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional demand assignment system as described above, and a first object of the present invention is to provide a demand assignment system that does not cause useless line assignment. A second object of the present invention is to provide a demand assignment system that can assign a line to a call having a high urgency first.
[発明の構成] (課題を解決するための手段) 本発明では、第1に、複数の従局が回線を介して通信
を行い、集中制御局が発呼局から送られてくる呼に応じ
て空き回線を割り当てるデマンドアサインメント方式に
おいて、回線がすべて閉塞されている状態において発生
した呼を受け付けて保留し、回線の1つが空くと前記保
留としてある呼に対して回線割り当ての要・不要の確認
を行って、割り当てを要とした呼にのみ回線を割り当て
るようにした。[Constitution of the Invention] (Means for Solving the Problems) In the present invention, first, a plurality of slave stations communicate via a line, and a central control station responds to a call sent from a calling station. In the demand assignment method for allocating a free line, a call generated while all the lines are blocked is accepted and held, and when one of the lines becomes free, the necessity / unnecessity of the line allocation is confirmed for the held call. To assign lines only to calls that need to be assigned.
また、本発明では第2に、複数の従局が回線を介して
通信を行い、集中制御局が発呼局から送られてくる呼に
応じて空き回線を割り当てるデマンドアサインメント方
式において、回線がすべて閉塞されている上体において
も発生した個を受け付けて保留し、回線の1つが空くと
呼の優先順位に基づいて回線の割り当てを行うようにし
た。Second, in the present invention, in a demand assignment system in which a plurality of slave stations communicate via a line and a central control station allocates an empty line according to a call sent from a calling station, all the lines are used. Even in the closed upper body, the number of occurrences is accepted and held, and when one of the lines becomes free, the line is assigned based on the priority of the call.
(作用) 上記第1の発明の構成によると回線の1つが空くと保
留としてある呼に対して回線割り当ての要・不要の確認
を行って割り当てを要とした呼にのみ回線を割り当てる
ため、保留中に発呼者が端末から離れてしまったような
呼に回線が割り当てられることがなく、効率よく回線の
割り当てが行われることになる。(Operation) According to the configuration of the first aspect of the present invention, if one of the lines becomes free, it is determined whether or not a line is to be held and whether or not the line is allocated is determined, and the line is allocated only to the call that needs to be allocated. The line is not allocated to a call in which the caller has left the terminal during the call, and the line is efficiently allocated.
また、第2の発明の構成によると、回線の1つが空く
と保留してある呼のうち予め定められている優先順位の
高い呼から回線が割り当てられることになり、緊急性の
高い呼が発生時が後であるため回線の割り当てが遅れる
という不具合をなくすことができる。Further, according to the configuration of the second invention, when one of the lines becomes free, the line is allocated from a call having a predetermined higher priority order among the held calls, and a call having a high urgency occurs. Since the time is later, the problem that the line assignment is delayed can be eliminated.
(実施例) 以下、図面を参照して本発明の一実施例を説明する。Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
第2図は本発明の一実施例に係るデマンドアサインメ
ント方式を採用した衛星通信システムのブロック図であ
る。同図において、A〜Zは地上局を示し、1は集中制
御局を示している。地上局A〜Z間及び集中制御局1間
は衛星2による回線によって接続されている。地上局A
〜Zは同一の構成であって、送受信部201、回線制御部2
02、通信制御部203、地上局制御部204を備える。地上局
A〜Zは地上交換機3を介して端末4に接続されてい
る。集中制御局1は地上局A〜Zと同様な機能を有し、
図示せぬ地上交換機を介して端末に接続されるが、それ
以外に、地上局A〜Zに対し回線の割り当てを行う。集
中制御局1は送受信部101、回線制御部102、集中制御部
104、通信制御部103を備える。送受信部101,201はアン
テナを介して電波の送受信を衛星2との間で行う。回線
制御部102,202は端末の信号を多重化・分離し、集中制
御部104または地上局制御部204により指示された所定の
回線への信号の挿入、抜き取りを行う。通信制御部104,
204は地上交換機3から送られる信号を回線制御部102,2
02または集中制御部104(地上局制御部204)へ振り分け
る。集中制御部104、地上局制御部204は呼制御信号を回
線制御部102,202、通信制御部103,203から受け取る。こ
の通信システムで呼制御信号が送受される回線は予め確
保されている。FIG. 2 is a block diagram of a satellite communication system employing a demand assignment system according to one embodiment of the present invention. In the figure, A to Z indicate ground stations, and 1 indicates a central control station. The ground stations A to Z and the central control station 1 are connected by a line using a satellite 2. Ground station A
ZZ have the same configuration, the transmission / reception unit 201, the line control unit 2
02, including a communication control unit 203 and a ground station control unit 204. The ground stations A to Z are connected to the terminal 4 via the ground exchange 3. The central control station 1 has the same functions as the ground stations A to Z,
The terminal is connected to a terminal via a ground exchange (not shown). In addition, a line is allocated to the ground stations A to Z. The central control station 1 includes a transmitting / receiving unit 101, a line control unit 102, a central control unit.
104, a communication control unit 103 is provided. The transmission / reception units 101 and 201 transmit / receive radio waves to / from the satellite 2 via an antenna. The line controllers 102 and 202 multiplex and demultiplex the terminal signals, and insert and extract signals into and from predetermined lines designated by the centralized controller 104 or the ground station controller 204. Communication control unit 104,
Reference numeral 204 denotes a signal sent from the terrestrial exchange 3 to the line control units 102 and 2
02 or the central control unit 104 (the ground station control unit 204). The central control unit 104 and the ground station control unit 204 receive call control signals from the line control units 102 and 202 and the communication control units 103 and 203. In this communication system, a line through which a call control signal is transmitted and received is reserved in advance.
集中制御局1が回線の割り当てを行うことは述べた
が、実際には集中制御部104が第3図に示される構成を
有しており、ここが回線の割り当てを行う。即ち、中央
制御装置7、記憶部5、入出力装置6がバス8を介して
接続されている。中央制御装置7はコンピュータの構成
であって、自らが有している主メモリ内のプログラム及
びデータに基づき回線の割り当て制御を行う。入出力装
置6は例えば、キーボードや表示器を備え、呼の優先順
を示すデータの入力等に行いられる。記憶部5は中央制
御装置7が用いるメモリであって、主メモリの一部であ
ってもよい。記憶部5には、回線空塞状態テーブル51、
待キューテーブル52、呼優先順テーブル53が備えられて
いる。回線空塞テーブル51では「1」が塞で、「0」が
空であることを示し、回線ナンバ1,2では回線が全て塞
がっていることを示す。待キューテーブル52には、回線
の空きを待っている呼の端末識別情報(地上局のアルフ
ァベットと3桁の数字で表示)が格納されている。呼優
先順テーブル53には、優先順が定められた呼の端末識別
情報が優先順に格納されており、ここにない端末識別情
報の呼は従来通り、発生順に待キューテーブル52に並べ
られる。なお、優先順位の付された端末は、例えば、災
害連絡用端末等のものである。また、呼優先順テーブル
53の「同報No2、緊急No1」は通信の内容によって優先順
が異なることを示し、この内容による順位は端末識別情
報による場合より下位である。Although it has been described that the central control station 1 allocates lines, the central control unit 104 actually has the configuration shown in FIG. 3, and this performs line allocation. That is, the central control device 7, the storage unit 5, and the input / output device 6 are connected via the bus 8. The central control unit 7 has a computer configuration and controls line allocation based on programs and data in a main memory of the central control unit 7. The input / output device 6 includes, for example, a keyboard and a display, and is used for inputting data indicating the priority order of calls. The storage unit 5 is a memory used by the central control device 7, and may be a part of the main memory. The storage unit 5 has a line idle / busy state table 51,
A waiting queue table 52 and a call priority order table 53 are provided. In the line idle / busy table 51, “1” indicates that the line is closed, and “0” indicates that the line is empty, and line numbers 1 and 2 indicate that all lines are closed. The waiting queue table 52 stores the terminal identification information (displayed by the alphabet of the ground station and the three-digit number) of the call waiting for an available line. The call priority order table 53 stores the terminal identification information of the call for which the priority order is determined, and the calls of the terminal identification information not present here are arranged in the waiting queue table 52 in the order of occurrence as in the related art. The terminal with the priority is, for example, a terminal for disaster communication. Also, call priority order table
53 "Broadcast No. 2 and emergency No. 1" indicates that the priority order differs depending on the content of the communication, and the order based on this content is lower than that based on the terminal identification information.
中央制御装置7は主メモリに格納されている第4図に
示されるフローチャートのプログラムに基づいて回線割
り当て制御を行う。例えば、第2図の端末4が所定のダ
イヤル信号を送出すると、これが、地上交換機3を介し
て地上局A〜Zへ到り、通信制御部203から地上局制御
部204へ与えられる。そこで、地上局制御部204が、発呼
局端末、被呼局端末の識別情報及び通信種別(同報等)
を含んだ回線割り当て要求信号を回線制御部202へ送出
すると、これが衛星2を介して集中制御局1へ到り、集
中制御部104が受け取る。即ち、第3図の中央制御装置
7が受け取ることになる。従って、第4図の回線要求を
監視していた中央制御部7はステップ401でYESへ分岐
し、回線空塞テーブル51を参照し、空き回線があるか否
かを調べる(402)。空き回線がある場合には当該の回
線に割り当てを示す回線割り当て信号を識別情報に基づ
き対応の発呼・被呼地上局へ与える(403)。この地上
局の地上局制御局204は回線制御部202、通信制御部203
を制御して割り当てられた回線によって地上交換機3間
を接続し、地上交換機3による被呼端末4の呼出し及び
通話開始、終話を可能とする。終話時には、地上局制御
部204が該当回線が空いた旨を集中制御部104へ通知す
る。The central controller 7 controls the line allocation based on the program of the flowchart shown in FIG. 4 stored in the main memory. For example, when the terminal 4 shown in FIG. 2 transmits a predetermined dial signal, the signal reaches the ground stations A to Z via the ground exchange 3, and is given from the communication control unit 203 to the ground station control unit 204. Therefore, the ground station control unit 204 determines the identification information and the communication type (broadcast etc.) of the calling station terminal and the called station terminal.
Is sent to the line control unit 202, the signal reaches the central control station 1 via the satellite 2, and is received by the central control unit 104. That is, it is received by the central control device 7 in FIG. Therefore, the central control unit 7, which has been monitoring the line request in FIG. 4, branches to YES in step 401 and refers to the line idle / busy table 51 to check whether there is an empty line (402). If there is a free line, a line assignment signal indicating the assignment to the line is given to the corresponding calling / called ground station based on the identification information (403). The ground station control station 204 of the ground station includes a line control unit 202, a communication control unit 203
Is controlled to connect the terrestrial exchanges 3 to each other, thereby enabling the terrestrial exchange 3 to call the called terminal 4, start and end the call. At the end of the call, the ground station control unit 204 notifies the central control unit 104 that the corresponding line is free.
一方、ステップ402で空きがないことが検出される
と、その旨を示すリンクビジィー信号が呼制御信号の回
線を介して当該の地上局A〜Z、地上交換機3へ与えら
れ地上交換機3は発呼端末を保留(例えば、音声トラン
スを制御して保留中を示す音楽やアナウンスを聞かせ
る)とする(404)。中央制御装置7は保留とした呼の
端末識別情報及び通信種別に基づき呼優先順テーブル53
をサーチし、優先の呼かを調べる(405)。ここで優先
の呼であれば、待キューテーブル52の対応する位置に当
該待キューを配置し(406)、優先の呼でなければ、待
キューの最終に配置する(407)。そして、空き回線の
発生待ちを行う(408)。空き回線が発生すると、被呼
端末4へ回線要求の確認のメッセージまたは信号を送る
ように該当地上局へ確認の指示を与える(409)。この
信号は回線要求と逆の経路で与えられる。そこで地上局
は発呼端末4の属する地上交換機3に対し確認のメッセ
ージを発呼端末へ送出させ、発呼端末からの応答(例え
ば、回線要求時と同じダイヤル入力等)を求めさせ、応
答の有無を調べさせる(410)。ここで、発呼端末から
応答があると、地上交換機3は応答の旨を地上局へ通知
する。地上局はこれを受けて集中制御局1へ応答の通知
を行う。そこで、中央制御装置7は該当回線の割り当て
通知を該当地上局へ送出し、更に、対応する待キューを
待キューテーブル52において削除するとともに、他の待
キューの順位を1づつ上昇させる(411)。一方、応答
がなければ、該当待キューを待キューテーブル52におい
て削減し、他の待キューの順位を1つづつ上昇させて
(412)エンドとなる。On the other hand, when it is detected in step 402 that there is no free space, a link busy signal indicating this is given to the ground stations A to Z and the ground exchange 3 via the line of the call control signal, and the ground exchange 3 makes a call. The terminal is put on hold (for example, an audio transformer is controlled to listen to music or an announcement indicating that the terminal is on hold) (404). The central control unit 7 makes a call priority order table 53 based on the terminal identification information and the communication type of the held call.
Is searched to see if it is a priority call (405). Here, if the call is a priority call, the waiting queue is arranged at a corresponding position in the waiting queue table 52 (406). If the call is not a priority call, the waiting queue is arranged at the end of the waiting queue (407). Then, it waits for the occurrence of an idle line (408). When an idle line is generated, a confirmation instruction is given to the corresponding ground station to send a message or signal for confirming the line request to the called terminal 4 (409). This signal is given in the reverse route to the line request. Then, the ground station causes the ground exchange 3 to which the calling terminal 4 belongs to send a confirmation message to the calling terminal, ask for a response from the calling terminal (for example, the same dial input as when requesting a line, etc.), and The presence or absence is checked (410). Here, when there is a response from the calling terminal, the ground exchange 3 notifies the ground station of the response. The ground station receives this and notifies the central control station 1 of a response. Therefore, the central control unit 7 sends a notification of the assignment of the line to the corresponding ground station, deletes the corresponding waiting queue in the waiting queue table 52, and raises the order of the other waiting queues by one (411). . On the other hand, if there is no response, the corresponding waiting queue is reduced in the waiting queue table 52, and the ranks of the other waiting queues are raised one by one (412), and the process ends.
なお、端末4には、通信種別の指定キーが備えられ、
ダイヤル入力及び指定キーの操作によって、被呼端末識
別情報、通信種別情報が送られる。発呼局端末情報は地
上交換機3から送られる。The terminal 4 is provided with a communication type designation key.
Called terminal identification information and communication type information are transmitted by dial input and operation of the designation key. The calling station terminal information is sent from the ground exchange 3.
このような構成の衛星通信システムで、地上局A,Bか
ら優先順のない呼と優先順がある呼とが発生した場合を
第1図によって説明する。時刻t1において、地上局Aか
ら回線要求信号が集中制御局1へ送られる。この被呼局
はZであるとする。しかし、回線の空きがないためリン
クビジィー信号が集中制御局1から地上局Aへ送出され
るとともに発呼端末が保留とされる。次に、時刻t2にお
いて地上局Bから被呼地上局Yとして緊急通信の種別を
有する回線要求信号が出力される。このときも、空き回
線がないため、リンクビジィー信号が地上局Bへ返さ
れ、保留となる。この呼は、時刻t1で発生した呼より優
先度が高いため、先に待キューとして並べられる。時刻
t3になって空き回線が生じたため、集中制御局1は確認
を求める信号を地上局B(優先度の高い方)へ送出す
る。ここで、中央制御装置7はΔTのタイムオーバーカ
ウントに入るが、ΔTを経過する前の時刻t4において応
答があったため、集中制御局1は発呼地上局Bと被呼地
上局Yとに回線を割り当てる。FIG. 1 illustrates a case where a call having no priority and a call having a priority occur from the ground stations A and B in the satellite communication system having such a configuration. At time t 1 , a line request signal is sent from the ground station A to the central control station 1. This called station is assumed to be Z. However, since there is no available line, a link busy signal is sent from the central control station 1 to the ground station A, and the calling terminal is put on hold. Next, the line request signal having a type of emergency communications from the ground station B as the called terrestrial stations Y at time t 2 are output. Also at this time, since there is no free line, a link busy signal is returned to the ground station B, and the signal is put on hold. This call has a higher priority than the call generated at time t 1, are arranged above as waiting queues. Times of Day
Since no free line occurs turned t 3, the centralized control station 1 sends a signal asking for confirmation to the ground station B (higher priority). Line Here, the central controller 7 enters the time-over count of [Delta] T, for a response at time t 4 before the expiration of [Delta] T, the centralized control station 1 to the calling ground station B and the called ground station Y Assign.
一方、時刻t5において更に空き回線が生じたため地上
局Aへ確認を求める信号が出力されたが、発呼端末から
応答がなく、ΔTのタイムオーバーとなったため、回線
が割り当てられなかったことを示す。On the other hand, the signal requesting confirmation to the ground station A for further idle line occurs at time t 5 is output, no response from the calling terminal, due to a time over the [Delta] T, indicating that the line has been assigned .
[発明の効果] 以上説明したように、保留状態から確認を行って回線
を割り当てるため無駄な割り当てがなく、効率がよい。
また、優先順に基づき割り当てを行うため、緊急な呼に
対する回線の割り当てが後回しにされることなく、適切
な回線の割り当てを行い得る。[Effects of the Invention] As described above, since the line is allocated after confirming from the hold state, there is no wasteful allocation and the efficiency is high.
In addition, since the assignment is performed based on the priority order, an appropriate line can be assigned without delaying the assignment of the line for the emergency call.
第1図は本発明による回線割り当て動作を示すタイムチ
ャート、第2図は本発明を採用した衛星通信システムの
ブロック図、第3図は第2図の要部ブロック図、第4図
は本発明による回線割り当て動作を示すフローチャート
である。 1……集中制御局、2……衛星 3A〜3Z……地上交換機 6……入出力装置 7……中央制御装置 101,201……送受信部 102,202……回線制御部 103,203……通信制御部 104……集中制御部 204……地上局制御部 A〜Z……地上局FIG. 1 is a time chart showing a channel assignment operation according to the present invention, FIG. 2 is a block diagram of a satellite communication system adopting the present invention, FIG. 3 is a block diagram of a main part of FIG. 2, and FIG. Is a flow chart showing a line assignment operation according to FIG. 1 ...... central control station, 2 ...... satellite 3 A to 3 Z ...... terrestrial exchange 6 ...... output device 7 ...... central controller 101, 201 ...... transceiver 102, 202 ...... line control unit 103 and 203 ...... communication control unit 104 ...... Central control unit 204 ...... Ground station control units A to Z ...... Ground station
Claims (2)
中制御局が発呼局が送られてくる呼に応じて空き回線を
割り当てるデマンドアサインメント方式において、回線
がすべて閉塞されている状態において発生した呼を受け
付けて保留し、回線の1つが空くと前記保留としてある
呼に対して回線割り当ての要・不要の確認を行って、割
り当てを要とした呼にのみ回線を割り当てることを特徴
とするデマンドアサインメント方式。In a demand assignment system in which a plurality of slave stations communicate via a line and a central control station allocates an empty line in response to a call sent from a calling station, all lines are blocked. A call generated in this state is accepted and put on hold, and when one of the lines becomes free, it is checked whether or not the call on hold is necessary / unnecessary to assign a line, and the line is assigned only to the call that needs to be assigned. Characteristic demand assignment method.
中制御局が発呼局から送られてくる呼に応じて空き回線
を割り当てるデマンドアサインメント方式において、回
線がすべて閉塞されている状態においても発生した呼を
受け付けて保留し、回線の1つが空くと呼の優先順位に
基づいて回線の割り当てを行うことを特徴とするデマン
ドアサインメント方式。2. A demand assignment system in which a plurality of slave stations communicate via a line and a central control station allocates an idle line in response to a call sent from a calling station, and all lines are blocked. A demand assignment method characterized in that a generated call is received and held even in a state, and when one of the lines becomes free, a line is allocated based on the priority of the call.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9304790A JP2953738B2 (en) | 1990-04-10 | 1990-04-10 | Demand assignment method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9304790A JP2953738B2 (en) | 1990-04-10 | 1990-04-10 | Demand assignment method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03292016A JPH03292016A (en) | 1991-12-24 |
JP2953738B2 true JP2953738B2 (en) | 1999-09-27 |
Family
ID=14071595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9304790A Expired - Lifetime JP2953738B2 (en) | 1990-04-10 | 1990-04-10 | Demand assignment method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2953738B2 (en) |
-
1990
- 1990-04-10 JP JP9304790A patent/JP2953738B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH03292016A (en) | 1991-12-24 |
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