JP2848273B2 - Satellite communication system - Google Patents
Satellite communication systemInfo
- Publication number
- JP2848273B2 JP2848273B2 JP7154887A JP15488795A JP2848273B2 JP 2848273 B2 JP2848273 B2 JP 2848273B2 JP 7154887 A JP7154887 A JP 7154887A JP 15488795 A JP15488795 A JP 15488795A JP 2848273 B2 JP2848273 B2 JP 2848273B2
- Authority
- JP
- Japan
- Prior art keywords
- dama
- power supply
- line
- voltage
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
- Radio Relay Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、複数の子局と親局と衛
星から構成し、割合要求多元接続方式で割り当てられた
送受一対の周波数で任意の子局同士が衛星を介して通信
を行う衛星通信方式において、特に子局の異常終了を親
局が認識する手段を有する衛星通信方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of slave stations, a master station, and a satellite, and allows arbitrary slave stations to communicate with each other via a satellite at a pair of transmission / reception frequencies assigned by a ratio request multiple access system. Particularly, the present invention relates to a satellite communication system having means for recognizing abnormal termination of a slave station by a master station.
【０００２】[0002]
【従来の技術】従来より、衛星通信方式において、一つ
の音声チャネルに対して一つのキャリア（搬送波）を割
り当てるＳＣＰＣ（Ｓｉｎｇｌｅ Ｃｈａｎｎｅｌ Ｐ
ｅｒＣａｒｒｉｅｒ）通信方式が用いられており、さら
に周波数の有効利用を目的として、割合要求多元接続
（Ｄｅｍａｎｄ Ａｓｓｉｇｎｍｅｎｔ Ｍｕｌｔｉｐ
ｌｅ Ａｃｃｅｓｓ、以下、ＤＡＭＡと記す。）方式に
よる運用が行われてきた。2. Description of the Related Art Conventionally, in a satellite communication system, an SCPC (Single Channel P) for allocating one carrier (carrier) to one voice channel.
erCarrier) communication system, and for the purpose of effective use of the frequency, demand demand multiple access (Demand Assignment Multiple Access).
le Access, hereinafter referred to as DAMA. ) The system has been operated.
【０００３】ＤＡＭＡ方式は、多数のＳＣＰＣ用無線チ
ャンネルの周波数管理を行う親局が、一定数のチャネル
を各地球局（子局）に共通にプールしておき、呼が発生
する度に共通プール中の空きチャンネル中の送受一対の
周波数を割り当て、子局からの終話通知を受けて割り当
てを解放して空きチャンネルに戻すという回線方式であ
る。通常用いられるＤＡＭＡ方式では、親局は回線の制
御のみを行い、割り当てられた回線の使用状態の監視は
行わない。以下、図２の従来のＤＡＭＡ方式を用いる衛
星通信システムの構成図をもちいて説明する。In the DAMA system, a master station that manages the frequency of a large number of radio channels for SCPC pools a certain number of channels in common for each earth station (slave station), and every time a call occurs, a common pool is created. This is a line system in which a pair of transmission / reception frequencies in an empty channel is allocated, and upon receiving a call termination notification from a slave station, the allocation is released and the channel is returned to an empty channel. In the commonly used DAMA system, the master station controls only the line and does not monitor the use state of the allocated line. Hereinafter, a description will be given with reference to a configuration diagram of a satellite communication system using the conventional DAMA system shown in FIG.
【０００４】図２において、同一構成の複数の子局６の
中の任意の対向する２局のＤＡＭＡ処理部１，２は、そ
れぞれ、電話機やファクシミリ等の加入者端末１０，２
０を備え、ＤＡＭＡ方式で回線割り当て制御を行う親局
３と衛星４を介して接続される。衛星回線は通話用回線
５０と制御用回線（ＣＳＣチャンネル）５１とからな
る。例えば、ＤＡＭＡ処理部１と同２間の通話路の接続
は次の手順で行われる。なお、図２のＤＡＭＡ処理部
１，２の構成は、本ＤＡＭＡ機能に関する部分のみ記載
されており、高周波回路、音声信号伝送路等は省略され
ている。In FIG. 2, DAMA processing units 1 and 2 of two opposing stations out of a plurality of slave stations 6 having the same configuration are respectively connected to subscriber terminals 10 and 2 such as telephones and facsimile machines.
0, which is connected via a satellite 4 to a master station 3 which performs line assignment control in the DAMA system. The satellite line includes a communication line 50 and a control line (CSC channel) 51. For example, connection of a communication path between the DAMA processing units 1 and 2 is performed in the following procedure. Note that the configuration of the DAMA processing units 1 and 2 in FIG. 2 shows only a part related to the present DAMA function, and a high-frequency circuit, an audio signal transmission path, and the like are omitted.
【０００５】ＤＡＭＡ処理部１において、通話検出回路
１４にて端末１０のオフフックが検出されると、制御部
１７は同調回路１８の周波数を制御用回線５１の周波数
にセットし、変復調器１９からＤＡＭＡ処理部２との接
続を内容とする接続要求を制御用回線５１に送出させ
る。In the DAMA processing unit 1, when the off-hook of the terminal 10 is detected by the call detection circuit 14, the control unit 17 sets the frequency of the tuning circuit 18 to the frequency of the control line 51, A connection request containing the connection with the processing unit 2 is transmitted to the control line 51.
【０００６】親局３では、同調回路３５は制御用回線５
１の周波数にセットされているので、制御用回線５１に
送出されたＤＡＭＡ処理部１からの接続要求は変復調器
３３で復調され制御部３１に伝えられる。制御部３１
は、ＤＡＭＡ処理部１とＤＡＭＡ処理部２が使用する回
線（本図に示めされる通話用回線５０）を決定する。In the master station 3, the tuning circuit 35 is connected to the control line 5
Since the frequency is set to 1, the connection request from the DAMA processing unit 1 transmitted to the control line 51 is demodulated by the modem 33 and transmitted to the control unit 31. Control unit 31
Determines the line (the communication line 50 shown in the figure) used by the DAMA processing unit 1 and the DAMA processing unit 2.
【０００７】その後、通話用回線５０で使用する送受一
対の周波数を割り当て、ＤＡＭＡ処理部１と同２を通話
用回線５０での送受信に移行させること等を内容とする
親局制御信号６０を形成し、それを変復調器３３から制
御用回線５１に送出させる。[0007] Thereafter, a pair of transmitting and receiving frequencies to be used on the communication line 50 is allocated, and a master station control signal 60 is formed which includes the transition of the DAMA processing units 1 and 2 to transmission and reception on the communication line 50. Then, it is transmitted from the modem 33 to the control line 51.
【０００８】ＤＡＭＡ処理部１と同２では、制御用回線
５１に送出された親局制御信号６０がそれぞれ変復調器
１９，２９で復調され制御部１７，２７に入力する。制
御部１７，２７は親局制御信号６０の内容に従って同調
回路１８，２８の周波数を所定の送受信周波数に設定す
る。これにより、呼接続が行われ、両子局間での通信が
開始される。In the DAMA processing unit 1 and the DAMA processing unit 2, the master station control signal 60 transmitted to the control line 51 is demodulated by the modems 19 and 29, respectively, and is input to the control units 17 and 27. The control units 17 and 27 set the frequencies of the tuning circuits 18 and 28 to predetermined transmission / reception frequencies according to the contents of the master station control signal 60. As a result, a call connection is made, and communication between the slave stations is started.
【０００９】この結果、子局間で通話が開始されると、
親局３は、ＤＡＭＡ処理部１と同２が使用する通話用回
線５０から切り離される。従って、親局３は、ＤＡＭＡ
処理部１と同２が使用する通話用回線５０が未だ使用中
であるか、正常であるか等の監視を直接行うことができ
ない。As a result, when a call is started between slave stations,
The master station 3 is disconnected from the communication line 50 used by the DAMA processing units 1 and 2. Therefore, the master station 3
It is not possible to directly monitor whether the communication line 50 used by the processing units 1 and 2 is still in use or normal.
【００１０】そこで、各子局において、通話継続の有無
を通話検出回路１６，２６にて監視し、通話が終了する
と制御部１７，２７は、同調回路１８，２８の周波数を
制御用回線１５の周波数にセットし、正常終了を内容と
する子局制御信号６１を親局３に送る。これにより親局
３は、割り当てられた送受一対の周波数を解消し回線を
プールに戻す。Therefore, in each of the slave stations, the presence / absence of speech continuity is monitored by the speech detection circuits 16 and 26, and when the speech is terminated, the control units 17 and 27 adjust the frequency of the tuning circuits 18 and 28 to the frequency of the control line 15. The frequency is set, and a slave station control signal 61 having the content of normal termination is sent to the master station 3. As a result, the master station 3 cancels the assigned pair of transmission and reception frequencies and returns the line to the pool.
【００１１】また、各子局間では、通話期間中、制御部
１７，２７が音声帯域外発信器１５，２５を制御して所
定時間間隔で音声帯域外信号６３，６４を発生させる。
これは、所定の周期のバースト信号であり、通話中の回
線５０を介して相手子局に送られる。各子局では、それ
ぞれこのバースト信号を音声帯域外信号受信器１６，２
６で受信処理して制御部１７，２７に送り、正常にバー
スト信号が受信されたかどうかを確認する。Also, between the slave stations, during the call period, the control units 17 and 27 control the out-of-band transmitters 15 and 25 to generate out-of-band signals 63 and 64 at predetermined time intervals.
This is a burst signal of a predetermined cycle, which is sent to the partner station via the line 50 during a call. Each of the slave stations transmits the burst signal to the out-of-voice signal receivers 16 and 2 respectively.
In step 6, the signal is received and sent to the control units 17 and 27 to check whether the burst signal has been normally received.
【００１２】つまり両子局は、通話期間中、バースト信
号を送受信し、回線の状態を監視する。そして、バース
ト信号の送受信に異常が発生すると、両子局では制御部
１７，２７が回線接続の不良を認知し、同調回路１８，
２８の周波数を制御回線５１の周波数にセットし、異常
終了を内容とする子局制御信号６１を親局３に送る。こ
れにより親局３は、割り当てられた送受一対の周波数を
解消し回線をプールに戻す。That is, the two slave stations transmit and receive burst signals during the call period and monitor the state of the line. Then, when an error occurs in the transmission and reception of the burst signal, the control units 17 and 27 in both the slave stations recognize the failure of the line connection, and
The frequency of 28 is set to the frequency of the control line 51, and the slave station control signal 61 containing the abnormal end is sent to the master station 3. As a result, the master station 3 cancels the assigned pair of transmission and reception frequencies and returns the line to the pool.
【００１３】以上のように、親局３は割り当てられた子
局の回線の状態を直接監視する事はできず、間接的に監
視できるに過ぎない。この従来のＤＡＭＡ動作に関して
は、例えば特公昭５３−１４４２０８号公報や特開昭６
０−３３７４６号公報に詳細の記載がある。As described above, the master station 3 cannot directly monitor the state of the line of the assigned slave station, but can only monitor it indirectly. Regarding this conventional DAMA operation, for example, Japanese Patent Publication No. 53-144208 and
No. 0-33746 has a detailed description.
【００１４】[0014]
【発明が解決しようとする課題】以上説明したＤＡＭＡ
方式を用いた衛星通信方式では、次のような問題があ
る。SUMMARY OF THE INVENTION The above-described DAMA
The satellite communication system using the system has the following problems.
【００１５】すなわち、本方式で子局は電池電源で動作
している通話中に両者の電池電源がともに消耗し正常な
送受信動作を行えなくなった場合に、子局から親局に異
常終了を通知する手段を持っていない。そのため親局は
子局間の呼接続の異常終了を認識できず、割り当てられ
た回線を共通プールに戻すことができない問題を有して
おり、さらに、通話に対して回線使用料を取っている場
合には超過課金を起こしてしまうという問題がある。In other words, in this system, the slave station notifies the master station of abnormal termination when both battery power sources are exhausted during a call operating on the battery power source and normal transmission / reception cannot be performed. Have no means to do so. Therefore, the master station cannot recognize the abnormal termination of the call connection between the slave stations, has a problem that the assigned line cannot be returned to the common pool, and has a line usage fee for the call. In such a case, there is a problem that an overcharge is caused.
【００１６】本発明の目的は、ＤＡＭＡを用いる衛星通
信方式において、子局の電源低下による送受信動作の異
常が発生する以前に確実に、親局に対し異常終了の通知
をなし得る衛星通信方式を提供することにある。It is an object of the present invention to provide a satellite communication system using DAMA, which can surely notify a master station of an abnormal termination before a transmission / reception operation error occurs due to a power failure of a slave station. To provide.
【００１７】本発明の衛星通信方式は、デマンドアサイ
ンタント（ＤＡＭＡ）方式で親局に予め記憶された複数
の無線回線の中から割り当てられた送受信一対の周波数
からなる衛星回線により子局どおしで通信を行う衛星通
信方式において、前記子局は、複数の端末ごとに独立し
て前記親局と前記ＤＡＭＡ用の制御信号もしくは通信を
行う相手の子局との通信信号とを伝送する複数のＤＡＭ
Ａ処理手段と、前記子局へ入力する電源電圧が所定の電
圧以下となった場合に前記複数のＤＡＭＡ処理手段の中
で通信に使われていないＤＡＭＡ処理手段を選択し、前
記ＤＡＭＡ処理手段が全て使用中の場合に強制的に使用
を中止して前記電源電圧の低下の情報を送出する共通制
御手段と、前記選択されたＤＡＭＡ処理手段を用いて前
記親局へ子局の異常電圧情報を通知する通知手段とを有
し、前記親局は、前記通知手段を制御回線で受けた後、
所定の時間で前記子局に割り当てられた送受一対の周波
数を前記予め記憶された複数の無線回線に戻す制御手段
とを有する。The satellite communication system of the present invention uses a demand assignable (DAMA) system to connect slave stations to each other by using a satellite line consisting of a pair of transmitting and receiving frequencies assigned from a plurality of wireless lines pre-stored in the master station. In the satellite communication method of performing communication in the above, the slave station independently transmits the master station and the control signal for the DAMA or a communication signal between the slave station of the communication partner and a plurality of terminals for each of a plurality of terminals. DAM
A processing means, and selecting a DAMA processing means which is not used for communication among the plurality of DAMA processing means when a power supply voltage inputted to the slave station falls below a predetermined voltage.
Forced use when all DAMA processing means are in use
Having a common control means for canceling the power supply voltage and sending the information of the power supply voltage drop, and a notifying means for notifying the master station of the abnormal voltage information of the slave station using the selected DAMA processing means, The master station, after receiving the notification means on the control line,
Control means for returning a pair of transmission / reception frequencies assigned to the slave station to the plurality of pre-stored radio lines at a predetermined time.
【００１８】[0018]
【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１９】図１は本発明の一実施例に係わる小型地球
局を備える衛星通信方式を示した図である。FIG. 1 is a diagram showing a satellite communication system having a small earth station according to one embodiment of the present invention.
【００２０】なお、図２に示した従来の衛星通信方式と
同一構成部には同一符号を符してある。The same components as those of the conventional satellite communication system shown in FIG. 2 are denoted by the same reference numerals.
【００２１】図１において、複数の同一構成の子局６０
の中の任意の２局のＤＡＭＡ処理部１００と同２００と
親局３，衛星４とから構成されている。本図における子
局６０は、電源は図示していないが、電池電源でも作動
する可搬形の小型地球局である。ここで、ＤＡＭＡ処理
部１００の構成は、図２で示されたＤＡＭＡ処理部１を
複数（Ｎ個）有して、複数のチャンネルを送受信でき、
さらに共通部として、入力印加電圧監視部１０１、警報
音発振部１０４、アラームランプ１０３及び共通制御部
１０２とを具備する。In FIG. 1, a plurality of slave stations 60 having the same configuration are provided.
Are composed of two arbitrary DAMA processing units 100 and 200, a master station 3, and a satellite 4. Although a power source is not shown in the figure, the slave station 60 is a portable small earth station that operates on battery power. Here, the configuration of the DAMA processing unit 100 has a plurality (N) of the DAMA processing units 1 shown in FIG. 2 and can transmit and receive a plurality of channels.
Further, the common unit includes an input applied voltage monitoring unit 101, an alarm sound oscillation unit 104, an alarm lamp 103, and a common control unit 102.
【００２２】また、共通制御部１０２は、ＤＡＭＡ処理
部１−１から１−Ｎ内の制御部１７−１から１７−Ｎ
（但し、図１においては省略されている）とそれぞれ接
続されて、制御信号が送受信されている。同様に、ＤＡ
ＭＡ処理部２００についても、ＤＡＭＡ処理部２−１〜
２−Ｎを具備して複数の無線信号の送受信を可能とし、
また共通部として入力印加電圧監視部２０１，警報音発
振部２０４，アラームランプ２０３，共通制御部２０２
を有している。The common control unit 102 controls the control units 17-1 to 17-N in the DAMA processing units 1-1 to 1-N.
(However, it is omitted in FIG. 1), and control signals are transmitted and received. Similarly, DA
As for the MA processing unit 200, the DAMA processing units 2-1 to 2-1
2-N to enable transmission and reception of a plurality of radio signals,
Also, as common parts, an input applied voltage monitoring part 201, an alarm sound oscillating part 204, an alarm lamp 203, a common control part 202
have.
【００２３】両子局の入力印加電圧監視部１０１，２０
１は、電池電源より供給される電圧のレベルを監視し、
規定電圧以下に低下すると、電圧レベル低下信号をそれ
ぞれ共通制御部１０２，２０２に送出する。共通制御部
１０２，２０２は、入力印加電圧監視部１０１，２０１
より電圧レベル低下信号を受けた場合、それぞれ警報音
発振部１０４，２０４に警報音を出力させ、アラームラ
ンプ１０３，２０３を点灯させる。これにより、当該小
型地球局の運用者は電源電圧の低下を知ることができ
る。Input applied voltage monitoring units 101 and 20 of both slave stations
1 monitors the level of the voltage supplied from the battery power supply,
When the voltage drops below the specified voltage, a voltage level reduction signal is sent to the common control units 102 and 202, respectively. The common control units 102 and 202 include the input applied voltage monitoring units 101 and 201
When the voltage level lowering signal is received, the alarm sounds are output to the alarm sound oscillators 104 and 204, and the alarm lamps 103 and 203 are turned on. Thereby, the operator of the small earth station can know the drop of the power supply voltage.
【００２４】また、共通制御部１０２，２０２は、上記
動作と併わせて本小型地球局（子局）に用意されている
複数の音声回線の中で、現在使用されていない回線を検
知する。この時、本未使用状態の回線例えば、ＤＡＭＡ
処理部１００内のＤＡＭＡ処理部１−１で扱われる回線
の同調回路１８−１は、その周波数は制御回線５１にセ
ットされている。よって、共通制御部１０２は制御部１
７−１を介して、本子局の入力印加電圧が低下し、まも
なく正常運用ができなくなることを、親局３へ制御回線
５１により通知する。In addition to the above operations, the common control units 102 and 202 detect a line which is not currently used among a plurality of voice lines prepared in the small earth station (slave station). At this time, this unused line, for example, DAMA
The frequency of the tuning circuit 18-1 of the line handled by the DAMA processing unit 1-1 in the processing unit 100 is set to the control line 51. Therefore, the common control unit 102 controls the control unit 1
Via the control line 51, the master station 3 is notified via the control line 51 that the input applied voltage of the main station drops and the normal operation will soon be impossible.
【００２５】通知を受けた親局３は、その制御部３１
が、当該ＤＡＭＡ処理部１００が入力印加電圧低下を検
出してから、正常動作不良に至るまでに十分な時間（Ｔ
１）、当該ＤＡＭＡ処理部１００の運用状況を監視し、
Ｔ１を経過しても、まだ、当該子局で音声回線の運用が
認められたときには、当該ＤＡＭＡ処理部１００が、異
常終了したものと見なし、割り当てていた送受一対の周
波数を解消し回線をプールに戻す。The master station 3 that has received the notification sends a message to the control unit 31
However, after the DAMA processing unit 100 detects the drop in the input applied voltage, a sufficient time (T
1), monitor the operation status of the DAMA processing unit 100,
If the operation of the voice line is still permitted in the slave station even after the passage of T1, the DAMA processing unit 100 regards the abnormal termination, cancels the assigned pair of transmission / reception frequencies, and pools the line. Return to
【００２６】ここで、当該子局に用意されている音声回
線がすべて使用中の場合は、共通制御部１０２，２０２
が、その中の任意の１音声回線に対して、制御部１７−
１，２７−１を介して、通話の強制切断を行い、同調回
路１８−１，２８−１を制御回線５１に設定して、親局
３へ入力印加電圧の低下を通知する。上記、任意の１音
声回線は子局の運用状況により、あらかじめ共通制御部
１０２，２０２に記憶させておく。Here, if all the audio lines prepared for the slave station are in use, the common control units 102 and 202
However, the control unit 17-
Via 1 and 27-1, the call is forcibly disconnected, the tuning circuits 18-1 and 28-1 are set on the control line 51, and the master station 3 is notified of the drop in the input applied voltage. The arbitrary one voice line is stored in advance in the common control units 102 and 202 according to the operation status of the slave station.
【００２７】[0027]
【発明の効果】以上説明したように、本発明の衛星通信
方式によれば、運用者が入力電圧低下を認識しているに
もかかわらず、通話を継続し、子局の異常動作状態に至
り、さらに、予備の電池電源による子局の再起動を行わ
ない場合でも、確実にＴ１後に親局３は、本子局に割り
当てていた周波数を解消することが可能となり、周波数
の有効利用を実現できる。As described above, according to the satellite communication system of the present invention, even if the operator recognizes that the input voltage has dropped, the call is continued and the slave station is brought into an abnormal operation state. Further, even when the slave station is not restarted by the spare battery power source, the master station 3 can surely cancel the frequency allocated to the slave station after T1, and can realize effective use of the frequency. .
【図１】本発明の一実施例に係わる小型地球局を備える
衛星通信方式の構成図である。FIG. 1 is a configuration diagram of a satellite communication system including a small earth station according to an embodiment of the present invention.
【図２】従来例の小型地球局を備える衛星通信方式の構
成図である。FIG. 2 is a configuration diagram of a satellite communication system including a conventional small earth station.
各構成要素を下記に示す。 １ ＤＡＭＡ処理部 ２ ＤＡＭＡ処理部 ３ 親局 ４ 衛星 ６ 子局 １０ 加入者端末 １４，２４ 通話検出回路 １５，２５ 音声帯域外信号発振器 １６，２６ 音声帯域外信号受信器 １７，２７ 制御部 １８，２８ 同調回路 １９，２９ 変復調器 ３１ 制御部 ３２ 音声帯域外信号発振器 ３３ 変復調器 ３４ 音声帯域外信号受信器 ３５ 同調回路 ５０ 通話用回線 ５１ 制御回線 ６０ 子局 １００，２００ ＤＡＭＡ処理部 １０１，２０１ 入力印加電圧監視部 １０２，２０２ 共通制御部 １０３，２０３ アラームランプ １０４，２０４ 警報音発振部 Each component is shown below. 1 DAMA processing unit 2 DAMA processing unit 3 master station 4 satellite 6 slave station 10 subscriber terminal 14, 24 call detection circuit 15, 25 out-of-band signal oscillator 16, 26 out-of-band signal receiver 17, 27 control unit 18, 28 Tuning circuit 19, 29 Modulator / demodulator 31 Control unit 32 Out-of-band signal oscillator 33 Modulator / demodulator 34 Out-of-band signal receiver 35 Tuning circuit 50 Communication line 51 Control line 60 Slave station 100, 200 DAMA processing unit 101, 201 Input Applied voltage monitoring unit 102, 202 Common control unit 103, 203 Alarm lamp 104, 204 Alarm sound oscillating unit
Claims (4)
式で親局に予め記憶された複数の無線回線の中から割り
当てられた送受信一対の周波数からなる衛星回線により
子局どおしで通信を行う衛星通信方式において、前記子
局は、複数の端末ごとに独立して前記親局と前記ＤＡＭ
Ａ用の制御信号もしくは通信を行う相手の子局との通信
信号とを伝送する複数のＤＡＭＡ処理手段と、前記子局
へ入力する電源電圧が所定の電圧以下となった場合に前
記複数のＤＡＭＡ処理手段の中で通信に使われていない
ＤＡＭＡ処理手段を選択し、前記ＤＡＭＡ処理手段が全
て使用中の場合に強制的に使用を中止して前記電源電圧
の低下の情報を送出する共通制御手段と、前記選択され
たＤＡＭＡ処理手段を用いて前記親局へ子局の異常電圧
情報を通知する通知手段とを有し、前記親局は、前記通
知手段を制御回線で受けた後、所定の時間で前記子局に
割り当てられた送受一対の周波数を前記予め記憶された
複数の無線回線に戻す制御手段とを有することを特徴と
する衛星通信方式。1. A satellite communication system in which communication is performed between slave stations by a demand assignable (DAMA) method using a satellite line having a pair of transmitting and receiving frequencies assigned from a plurality of wireless lines pre-stored in a master station. In the system, the slave station is independent of the master station and the DAM for each of a plurality of terminals.
A plurality of DAMA processing means for transmitting a control signal for A or a communication signal with a slave station of a communication partner, and the plurality of DAMA processing means when a power supply voltage input to the slave station becomes equal to or lower than a predetermined voltage. A DAMA processing unit not used for communication is selected from the processing units, and the DAMA processing unit
If the power supply voltage is
Common control means for transmitting information on the decrease in the power supply, and notifying means for notifying the abnormal voltage information of the slave station to the master station by using the selected DAMA processing means. Control means for returning a pair of transmission / reception frequencies assigned to the slave station to the plurality of pre-stored radio lines at a predetermined time after receiving the data over the control line.
力して所定の電圧との比較を行う入力印加電圧監視部
と、前記電源電圧の低下に対して警報音を発生する警報
音発生部と、前記電源電圧の低下に対して点灯するアラ
ームランプと、前記入力印加電圧監視部の出力を受け未
使用な前記ＤＡＭＡ処理手段に対して前記電源低下の情
報を送出するとともに、前記入力印加電圧監視部と前記
警報音発生部とを制御する共通制御部とから構成される
ことを特徴とする請求項１記載の衛星通信方式。2. An input voltage monitoring section for inputting the power supply voltage and comparing the input voltage with a predetermined voltage, and an alarm sound generation section for generating an alarm sound when the power supply voltage drops. An alarm lamp that lights up when the power supply voltage drops, sends the power supply drop information to the unused DAMA processing means that receives an output of the input applied voltage monitoring unit, and outputs the input applied voltage. 2. The satellite communication system according to claim 1, comprising a common control unit for controlling a monitoring unit and said alarm sound generation unit.
れた加入者端末の加入者ラインの開閉を検出する通話検
出回路と、前記通話検出回路の検出信号を受けて前記親
局と前記制御回線で送受信可能な様に変復調器の周波数
制御を行い、前記ＤＡＭＡ動作に必要な情報を伝送する
制御部と、前記制御部から周波数を制御され変復調器の
送受信周波数を可変する同調回路と、前記子局どおしの
通信の場合に、所定のバースト信号を音声帯域外に送出
する音声帯域外信号発振器と、前記所定のバースト信号
を受信する音声帯域外信号受信器とを有することを特徴
とする請求項１記載の衛星通信方式。3. The DAMA processing means includes: a call detecting circuit for detecting opening / closing of a subscriber line of an externally connected subscriber terminal; and a master station and the control line receiving a detection signal of the call detecting circuit. A control unit for controlling the frequency of the modulator / demodulator so that transmission / reception is possible and transmitting information necessary for the DAMA operation; a tuning circuit for controlling the frequency by the control unit to vary the transmission / reception frequency of the modem; In the case of communication between stations, an out-of-band signal oscillator for transmitting a predetermined burst signal out of a voice band, and an out-of-band signal receiver for receiving the predetermined burst signal are provided. The satellite communication system according to claim 1.
作できることを特徴とする請求項１または２記載の衛星
通信方式。4. The satellite communication system according to claim 1, wherein the slave station can operate using an input power supply using a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7154887A JP2848273B2 (en) | 1995-06-21 | 1995-06-21 | Satellite communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7154887A JP2848273B2 (en) | 1995-06-21 | 1995-06-21 | Satellite communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH098723A JPH098723A (en) | 1997-01-10 |
| JP2848273B2 true JP2848273B2 (en) | 1999-01-20 |
Family
ID=15594137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7154887A Expired - Fee Related JP2848273B2 (en) | 1995-06-21 | 1995-06-21 | Satellite communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2848273B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7409394B2 (en) * | 2019-12-13 | 2024-01-09 | 日本電信電話株式会社 | Satellite communication system, master station equipment and line connection method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2595603B2 (en) * | 1988-01-11 | 1997-04-02 | 日本電気株式会社 | Request allocation multiple access control method |
| JPH05206911A (en) * | 1992-01-24 | 1993-08-13 | Nec Corp | Small earth station |
-
1995
- 1995-06-21 JP JP7154887A patent/JP2848273B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH098723A (en) | 1997-01-10 |
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