JPH0612883B2 - Control channel switching system - Google Patents
Control channel switching systemInfo
- Publication number
- JPH0612883B2 JPH0612883B2 JP60201769A JP20176985A JPH0612883B2 JP H0612883 B2 JPH0612883 B2 JP H0612883B2 JP 60201769 A JP60201769 A JP 60201769A JP 20176985 A JP20176985 A JP 20176985A JP H0612883 B2 JPH0612883 B2 JP H0612883B2
- Authority
- JP
- Japan
- Prior art keywords
- control channel
- threshold
- satellite
- channel
- zone
- 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
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
- Radio Relay Systems (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、マルチビーム移動体衛星通信方式におい
て、複数のアンテナ素子を切替えて衛星追尾を行なう移
動局が電源投入時、あるいはゾーン移行時にその移動局
が在圏するゾーンの制御チャネルで待ち受けとなるよう
な制御チャネル切替方式に関するものである。The present invention relates to a multi-beam mobile satellite communication system in which a mobile station that switches a plurality of antenna elements to perform satellite tracking is turned on at the time of power-on or zone transition. The present invention relates to a control channel switching system in which a mobile station waits on a control channel of a zone in which it is located.
（従来の技術） 従来、このような制御チャネル切替は自動車電話方式等
で行われているが、自動車電話では移動局アンテナは無
指向性アンテナを用いているため、チャネル切替は受信
機のローカル周波数を順次切替えていくだけである。(Prior Art) Conventionally, such control channel switching is performed by a car telephone system or the like, but since a mobile station antenna uses an omnidirectional antenna in a car telephone, channel switching is performed by a local frequency of a receiver. It is only to switch sequentially.
（発明が解決しようとする問題点） しかしながら、上述の自動車電話方式はアンテナ追尾の
必要な衛星を用いたシステムにそのまま適用することが
できなかった。したがってアンテナ素子の切替を含めた
制御チャネル切替方式とする必要がある。(Problems to be Solved by the Invention) However, the above-described car telephone system could not be applied as it is to a system using a satellite that requires antenna tracking. Therefore, it is necessary to adopt a control channel switching system that includes switching of antenna elements.
（問題点を解決するための手段） 本発明の特徴は、複数のアンテナ素子の切替によりアン
テナの指向特性を制御して衛星追尾を行なう移動局との
間で、ビーム毎に異なる周波数の制御チャネルをもつ通
信衛星を介して通信を行なうマルチビーム移動体衛星通
信方法において、移動局が電源を投入したとき又はゾー
ンを移行したときは、あるひとつのゾーンの周波数の制
御チャネルを受信し、アンテナ素子を切替えたときの各
素子の受信レベルの最大値が第１のしき値(S1)以上のと
きは、そのときの素子を通信チャネルに接続すると共に
衛星追尾を開始し、さらに回線品質がサービスエリア入
圏を規定する第２のしきい値(S2)以上であれば、その制
御チャネルで待受けとなり、回線品質がS2未満、又は前
記受信レベルの最大値がS1未満のときは、他のゾーンの
周波数の制御チャネルに切替えて前述の手順を繰り返し
てS2以上の回線品質の制御チャネルで待ち受け、待ち受
け中に回線品質がサービスエリア圏外を規定する第３の
しきい値(S3)未満となったときは、その制御チャネルを
保持したままアンテナ素子を切替えて前記手順を繰返し
てS3以上の回線品質で待受け可能とする制御チャネル切
替方式にある。(Means for Solving Problems) A feature of the present invention is that a control channel having a different frequency for each beam is used between a mobile station for controlling satellite directional characteristics by switching a plurality of antenna elements to perform satellite tracking. In a multi-beam mobile satellite communication method in which communication is performed via a communication satellite having an antenna, when the mobile station is turned on or the zone is shifted, a control channel having a frequency of a certain zone is received and an antenna element is used. When the maximum reception level of each element when switching is over the first threshold value (S 1 ), the element at that time is connected to the communication channel and satellite tracking is started, and the line quality is serviced. If the second threshold value (S 2 ) that defines the area coverage area or more, the control channel is in standby, and the line quality is less than S 2 or the maximum reception level is less than S 1. , A third threshold value (S) that switches to a control channel of the frequency of another zone and repeats the above-mentioned procedure to wait on a control channel with a line quality of S 2 or higher When it is less than 3 ), there is a control channel switching system in which the antenna element is switched while the control channel is held and the above procedure is repeated to enable standby with a line quality of S 3 or higher.
（作用） この発明によれば制御チャネルを切替えたとき、必ずア
ンテナ素子を切替えてすべての素子の受信レベルを比較
することにより、在圏ゾーンの制御チャネルを確実に受
信することができる。また、各素子の比較は短時間で検
出できる受信レベルで行ない、かつ、ここでしきい値S1
を設定してこれをクリアした場合のみ、通信系に接続
し、回線品質により在圏ゾーンの制御チャネルかどうか
を判定しているため、電源投入から制御チャネル受信ま
での時間を短縮でき、かつ正確な切替動作が可能であ
る。(Operation) According to the present invention, when the control channel is switched, the antenna element is always switched and the reception levels of all the elements are compared, so that the control channel of the located zone can be reliably received. In addition, the comparison of each element is performed at the reception level that can be detected in a short time, and the threshold S 1
Only when this is set and cleared, it is connected to the communication system and the line quality is used to determine whether the control channel is in the zone in which it is located.Therefore, the time from power-on to control channel reception can be shortened and accurate. A simple switching operation is possible.
（実施例） 図１にこの発明で対象としているマルチビーム移動体通
信方式の概念図を、図２にこの発明を実施する移動局の
構成例を示す。図３には制御チャネル切替方式のフロー
チャートを示す。以下、このフローチャートに従って説
明する。移動局の電源を投入したとき、どのゾーンに在
圏しているかは移動局では判断できないため、とりあえ
ずある周波数の制御チャネルを受信する。アンテナ切替
制御部でアンテナ素子を切替えて各素子による受信レベ
ルを検出系受信部及び受信レベル検出部で検出し、かつ
比較をして最大値を調べ、それがしきい値S1以上であれ
ばそのアンテナ素子を通信系に接続する。最大値がS1に
満たないときにはゾーンが異なると判断してすぐに制御
チャネルを切替えて同様な手順を繰り返す。アンテナ素
子を通信系に接続した後、通信系受信部及び復調部で受
信した受信データにもとづいて、回線品質検出部で回線
品質の検出を行い、ゾーンの在圏しきい値S2と比較し、
S2以上であればその制御チャネルが在圏ゾーンのもので
あると判断して待受け状態に入る。S2未満であればやは
りそのゾーンに在圏していないと判断して再び制御チャ
ネルを切替えて同様な手段を繰り返す。すべての制御チ
ャネルを切替えてなおかつS2以上の回線品質が得られな
い場合はサービスエリア外と判断する。待受け中には常
時回線品質を検出し、圏外しきい値S3を下回ったときに
は移動体の揺れ等により最適なアンテナ素子が代った可
能性もあるから、まずその制御チャンネルのまま最適ア
ンテナ素子の検索のルーチンヘもどり前記と同じ手順を
繰返す。しきい値S1，S2，S3はS2＞S3＞S1のように設定
するため、ゾーンの移行ではなく、たとえばアンテナ追
尾のミスで回線品質がS3を下回った場合にはアンテナ素
子切替えにより回線品質はS2以上となり、すみやかに待
ち受け状態にもどる。ゾーンの移行によって回線品質が
S3を下回った場合にはアンテナ素子切替によっても回線
品質はS2以上にならず、制御チャネルの切替を行って新
たなゾーンの制御チャネルで待受けになる。(Embodiment) FIG. 1 is a conceptual diagram of a multi-beam mobile communication system targeted by the present invention, and FIG. 2 shows a configuration example of a mobile station for carrying out the present invention. FIG. 3 shows a flowchart of the control channel switching system. Hereinafter, description will be given according to this flowchart. When the power of the mobile station is turned on, the mobile station cannot determine which zone it is in, so it receives a control channel of a certain frequency for the time being. The antenna switching control unit switches the antenna elements to detect the reception level by each element in the detection system reception unit and the reception level detection unit, and compares and checks the maximum value, and if it is the threshold value S 1 or more. The antenna element is connected to the communication system. When the maximum value is less than S 1 , it is determined that the zones are different, the control channel is switched immediately, and the same procedure is repeated. After connecting the antenna elements to the communication system, based on the data received by the communication system receiver and demodulation unit performs detection of channel quality in the channel quality detecting unit, as compared to the serving threshold S 2 zones ,
If S 2 or more, it is determined that the control channel belongs to the visited zone and the standby state is entered. If it is less than S 2 , it is determined that the vehicle is not in that zone and the control channel is switched again, and the same procedure is repeated. If all control channels are switched and the line quality of S 2 or higher is not obtained, it is judged to be out of the service area. The line quality is always detected during stand-by, and when it falls below the out-of-range threshold S 3 , there is a possibility that the optimum antenna element has replaced due to the shaking of the moving body, so first of all, the optimum antenna element remains on that control channel. Return to the search routine of and repeat the same procedure as above. The thresholds S 1 , S 2 , and S 3 are set as S 2 > S 3 > S 1 , so if the line quality falls below S 3 due to an antenna tracking error, for example, instead of zone transition. By switching the antenna elements, the line quality becomes S 2 or higher, and the standby state is immediately restored. Line quality is improved by zone migration
If it falls below S 3 , the line quality will not exceed S 2 even if the antenna element is switched, and the control channel will be switched to standby on the control channel of the new zone.
なお、受信レベルのしきい値(S1)の検出時間を回線品質
のしきい値(S2)の検出時間より短くして、電源投入又は
ゾーン移行から待受け状態に至る時間を短縮することが
できる。The detection time of the reception level threshold (S 1 ) can be made shorter than the detection time of the line quality threshold (S 2 ) to shorten the time from power-on or zone transition to the standby state. it can.
（発明の効果） 以上説明したように本方式によればゾーン数が多く制御
チャネルが多いシステムにおいても移動局の電源を投入
してから待ち受け状態になるまでの時間が短くでき、ま
たブロッキング等により一時的にアンテナ追尾が不能に
なった場合でもすみやかに復旧できる利点を有する。(Effects of the Invention) As described above, according to this method, even in a system with a large number of zones and a large number of control channels, it is possible to shorten the time from turning on the power of the mobile station to the standby state, and by blocking or the like Even if the antenna tracking is temporarily disabled, it has an advantage that it can be quickly recovered.
図１は本発明を適用する移動体通信方式の概念図、図２
は本発明による移動局の構成例、図３は本発明の動作フ
ローチャートである。FIG. 1 is a conceptual diagram of a mobile communication system to which the present invention is applied, and FIG.
Is a configuration example of a mobile station according to the present invention, and FIG. 3 is an operation flowchart of the present invention.
Claims (2)
の指向特性を制御して衛星追尾を行なう移動局との間
で、ビーム毎に異なる周波数の制御チャネルをもつ通信
衛星を介して通信を行なうマルチビーム移動体衛星通信
方式において、 移動局が電源を投入したとき又はゾーンを移行したとき
は、あるひとつのゾーンの周波数の制御チャネルを受信
し、アンテナ素子を切替えたときの各素子の受信レベル
の最大値が第１のしきい値(S1)以上のときは、そのとき
の素子を通信チャネルに接続すると共に衛星追尾を開始
し、 さらに回線品質がサービスエリア入圏を規定する第２の
しきい値(S2)以上であれば、その制御チャネルで待受け
となり、 回線品質がS2未満、又は前記受信レベルの最大値がS1未
満のときは、他のゾーンの周波数の制御チャネルに切替
えて前述の手順を繰り返してS2以上の回線品質の制御チ
ャネルで待受け、 待受け中に回線品質がサービスエリア圏外を規定する第
３のしきい値(S3)未満となったときは、その制御チャネ
ルを保持したままアンテナ素子を切替えて前記手順を繰
り返してS3以上の回線品質で待受け可能とすることを特
徴とする、制御チャネル切替方式。Claim: What is claimed is: 1. A multi-communication system for communicating with a mobile station for controlling satellite directional characteristics by switching a plurality of antenna elements to perform satellite tracking via a communication satellite having a control channel of a different frequency for each beam. In the beam mobile satellite communication system, when the power of the mobile station is turned on or when the zone is changed, the control channel of the frequency of a certain zone is received and the reception level of each element when the antenna element is switched When the maximum value is greater than or equal to the first threshold (S 1 ), the element at that time is connected to the communication channel and satellite tracking is started, and the line quality determines the second threshold that defines the service area entry. if threshold (S 2) or more, and waiting in its control channel, than channel quality S 2, or the when the maximum value of the reception level is less than S 1, control tea frequencies other zones Switch to Le Repeat the previous steps waiting in S 2 or more channel quality of the control channel, when the channel quality becomes a third threshold (S 3) below to define the service area out of service during the waiting is A control channel switching system, characterized in that the antenna element is switched while holding the control channel and the above procedure is repeated to enable standby with a line quality of S 3 or higher.
線品質のしきい値(S2)の検出時間より短くして、電源投
入又はゾーン移行から待受け状態に至る時間を短縮する
ことを特徴とする特許請求の範囲第１項記載の制御チャ
ネル切替方式。2. The detection time of the reception level threshold (S 1 ) is made shorter than the detection time of the line quality threshold (S 2 ) to shorten the time from power-on or zone transition to the standby state. The control channel switching system according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60201769A JPH0612883B2 (en) | 1985-09-13 | 1985-09-13 | Control channel switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60201769A JPH0612883B2 (en) | 1985-09-13 | 1985-09-13 | Control channel switching system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6262627A JPS6262627A (en) | 1987-03-19 |
| JPH0612883B2 true JPH0612883B2 (en) | 1994-02-16 |
Family
ID=16446631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60201769A Expired - Lifetime JPH0612883B2 (en) | 1985-09-13 | 1985-09-13 | Control channel switching system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0612883B2 (en) |
-
1985
- 1985-09-13 JP JP60201769A patent/JPH0612883B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6262627A (en) | 1987-03-19 |
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