JP2830374B2 - Mobile communication system - Google Patents
Mobile communication systemInfo
- Publication number
- JP2830374B2 JP2830374B2 JP2129812A JP12981290A JP2830374B2 JP 2830374 B2 JP2830374 B2 JP 2830374B2 JP 2129812 A JP2129812 A JP 2129812A JP 12981290 A JP12981290 A JP 12981290A JP 2830374 B2 JP2830374 B2 JP 2830374B2
- Authority
- JP
- Japan
- Prior art keywords
- control channel
- channel
- station
- transceiver
- control
- 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
Landscapes
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は専用チャネル制御方式でありマルチチャネル
アクセス方式による移動通信システムに関する。Description: TECHNICAL FIELD The present invention relates to a mobile communication system using a dedicated channel control method and a multi-channel access method.
従来、この種の移動通信システムは、制御チャネルの
割当てをシステム開発時点に固定し、基地局と端末局と
の間で複数の通信チャネルを共用して行う通信を制御チ
ャネルによって制御していた。Conventionally, in this type of mobile communication system, the assignment of a control channel is fixed at the time of system development, and communication performed by sharing a plurality of communication channels between a base station and a terminal station is controlled by the control channel.
〔発明が解決しようとする課題〕 上述した従来の移動通信システムは、制御チャネルを
予め固定的に割当てているために、初期の需要予測が外
れると制御チャネルの不足や過剰が生じたり、周波数妨
害によりその制御チャネルが使えなくなった時に代行の
制御チャネルを自由に設定できない欠点がある。[Problems to be Solved by the Invention] In the above-mentioned conventional mobile communication system, control channels are fixedly allocated in advance, so that if the initial demand forecast is deviated, shortage or excess of control channels may occur, or frequency interference may occur. Therefore, there is a disadvantage that a substitute control channel cannot be freely set when the control channel cannot be used.
本発明の移動通信システムは、送受信周波数がそれぞ
れあらかじめ定められている複数の無線チャネルを通信
チャネル及び制御チャネルに用いる移動通信システムに
おいて、前記無線チャネルを変えることなく前記通話チ
ャネル及び前記制御チャネルのいずれにも設定でき前記
制御チャネルとして設定されたとき前記制御チャネルで
あることを示す信号を周期的に送出する複数の第１の送
受信機を備えた基地局と、前記無線チャネルのいずれに
も同調可能な第２の送受信機、前回開局中の前記制御チ
ャネルの前記無線チャネルごとの捕捉回数の分布を示す
データを記憶する書替え可能な不揮発性メモリ、及び、
この不揮発性メモリの記憶内容と前記第２の送受信機の
受信入力電界と前記第２の送受信機の受信信号中の前記
制御チャネルであることを示す前記信号とから前記第２
の送受信機を制御して前記制御チャネルを走査捕捉し今
回開局後の前記制御チャネルの前記無線チャネルごとの
捕捉回数を計数し計数結果により前記不揮発性メモリの
記憶内容を閉局時に更新する制御部を備えた端末局とを
具備している。The mobile communication system according to the present invention is a mobile communication system using a plurality of radio channels each having a predetermined transmission / reception frequency as a communication channel and a control channel, wherein any one of the communication channel and the control channel is used without changing the radio channel. A base station including a plurality of first transceivers that periodically transmits a signal indicating the control channel when the control channel is set as the control channel; and tunable to any of the radio channels. A second transceiver, a rewritable non-volatile memory that stores data indicating a distribution of the number of acquisitions of the control channel for each radio channel that has been previously opened, and
From the contents stored in the nonvolatile memory, the received input electric field of the second transceiver, and the signal indicating the control channel in the received signal of the second transceiver, the second
A control unit that scans and captures the control channel by controlling the transceiver, counts the number of captures of the control channel for each wireless channel after the current channel is opened, and updates the storage content of the non-volatile memory when the station is closed according to the counting result. Equipped terminal station.
次に、本発明について図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示すブロック図である。 FIG. 1 is a block diagram showing one embodiment of the present invention.
基地局１〜３は小ゾーン方式でサービスエリアを構成
する分散基地局であり、それぞれゾーンａ〜ｃを電波的
にカバーしている。端末局４〜６は本実施例のサービス
エリア内、すなわち、ゾーンａ〜ｃ内を自由に移動する
多くの端末局の内のいくつかである。ゾーンａでは基地
局１に使用するチャネルとしてCH1,11,21,31,41,51,61,
71,81の計9CHが割り当てられており、この内の１つのチ
ャネルが制御チャネルとして動作し、他のチャネルが通
信チャネルとして動作するようになっている。同様に、
ゾーンｂではCH2,12,…82を使用し、ゾーンＣではCH3,1
3,…83を使用する。これらの制御チャネルと通信チャネ
ルの使い分けは運用センタ７より制御する。なお、各チ
ャネルのCH番号をＮとすると、基地局送信周波数ｆ＝f0
＋0.0125N［MHz］である。The base stations 1 to 3 are distributed base stations forming a service area in a small zone system, and cover the zones a to c in radio waves. The terminal stations 4 to 6 are some of the many terminal stations that freely move within the service area of the present embodiment, that is, the zones a to c. In the zone a, the channels used for the base station 1 are CH1, 11, 21, 31, 41, 51, 61,
A total of 9 channels of 71 and 81 are allocated, one of which operates as a control channel and the other operates as a communication channel. Similarly,
.. 82 are used in zone b, and CH3,1 is used in zone C.
Use 3, ... 83. The use of these control channels and communication channels is controlled by the operation center 7. When the CH number of each channel is N, the base station transmission frequency f = f 0
+0.0125 N [MHz].
端末局の発呼動作例を説明すると、今、端末局４が電
源投入されると、後述する制御チャネル捕捉方法で基地
局１の送信する制御チャネルを捕捉する。捕捉した制御
チャネルにより所定の発呼処理を行い、通信チャネルの
１つを用いて基地局１と接続し、交換局８を介して要求
した加入者電話９と接続し必要な通信を行う。An example of a calling operation of the terminal station will be described. When the power of the terminal station 4 is turned on, a control channel transmitted by the base station 1 is captured by a control channel capturing method described later. Predetermined call processing is performed by the captured control channel, connected to the base station 1 using one of the communication channels, and connected to the requested subscriber telephone 9 via the exchange 8 to perform necessary communication.
第２図は基地局１のブロック図である。 FIG. 2 is a block diagram of the base station 1.
運用センタ７からの各チャネルの動作モード指示は無
線制御部17を介して各送信機15及び各受信機16に対して
行われる。これにより１つのチャネルが制御チャネルと
して動作し、他のチャネルが通信チャネルとして動作す
る。各送信機15の出力は送信共用器13にて合成され送信
アンテナ11より送信される。一方、受信アンテナ12より
受信された信号は受信分配器14により各受信機16に分配
される。基地局2,3も送信機及び受信機チャネル番号が
異ることを除いては基地局１と同じ構成である。The operation mode instruction of each channel from the operation center 7 is issued to each transmitter 15 and each receiver 16 via the wireless control unit 17. Thereby, one channel operates as a control channel, and the other channel operates as a communication channel. The outputs of the transmitters 15 are combined by the transmission duplexer 13 and transmitted from the transmission antenna 11. On the other hand, the signal received from the receiving antenna 12 is distributed to each receiver 16 by the reception distributor 14. Base stations 2 and 3 have the same configuration as base station 1 except that the transmitter and receiver channel numbers are different.
第３図は端末局４のブロック図である。他の端末局も
構成はすべて同じである。FIG. 3 is a block diagram of the terminal station 4. All other terminal stations have the same configuration.
アンテナ41より受信された信号はアンテナ共用器42を
介して受信部44に入り、ここで復調され、制御部46及び
通話制御部47を経てスピーカ49に供給される。又、送信
機43は制御部46より発する制御信号及びマイクロホン4
8,通話制御部47からの変調信号をアンテナ共用器42を経
てアンテナ41より送信する。The signal received from the antenna 41 enters the receiving unit 44 via the antenna duplexer 42, where it is demodulated and supplied to the speaker 49 via the control unit 46 and the call control unit 47. Further, the transmitter 43 is provided with a control signal generated by the control unit 46 and the microphone 4.
8, The modulated signal from the call control unit 47 is transmitted from the antenna 41 via the antenna duplexer 42.
又、制御部46は受信部44からの入力電界情報と復調信
号から制御信号の検出を行い、内部に持つ統計処理部46
1で後述のような統計処理を実行し、後記する制御チャ
ネル捕捉動作を行う。Further, the control unit 46 detects a control signal from the input electric field information and the demodulated signal from the receiving unit 44, and has an internal statistical processing unit 46.
In step 1, a statistical process as described later is executed, and a control channel capturing operation described later is performed.
第４図に基地局１〜３の送信する制御チャネルのフォ
ーマットを示す。FIG. 4 shows the format of the control channel transmitted by the base stations 1 to 3.
本実施例では制御チャネルは連続送信されており、フ
レーム同期信号（FS）Ｆが一定間隔でくり返されてお
り、これにより各端末局は後述する制御チャネル捕捉に
おいて制御チャネルか通信チャネルか見分けることが可
能となる。データ部Ｄは回線制御用の各種データが配置
されている。In this embodiment, the control channel is continuously transmitted, and the frame synchronization signal (FS) F is repeated at regular intervals, whereby each terminal station can distinguish between the control channel and the communication channel in the control channel acquisition described later. Becomes possible. In the data section D, various data for line control are arranged.
次に、各端末局の制御チャネル捕捉動作を第５図，第
６図を用いて説明する。Next, the control channel capturing operation of each terminal station will be described with reference to FIGS.
端末局は電源が投入されると、不揮発性メモリ462に
記憶されている第５図に示すようなイメージのチャネル
別の制御チャネル捕捉回数（又は確率）分布より回数
（又は確率）が高い方から複数の制御チャネル候補の第
１群を選ぶ（第６図,S1）。次に、第１群の各チャネル
の入力電圧測定と信号内容により制御チャネルかどうか
の確認を行ない、制御チャネルで且つ入力電圧が通常サ
ービスエリア内で規定している規定値以上で最も高いチ
ャネルを使用する制御チャネルとして捕捉し、圏内モー
ドを設定して通常の運用動作に入る（S2,S3）。閉局操
作が行われると（S4）、開局中に種々の手順により捕捉
した制御チャネルの捕捉回数を計数し、過去の累積デー
タと合わせて統計処理をし、不揮発性メモリ462の制御
チャネル捕捉回数（又は確率）分布を更新し（S5）、電
源断とする。When the terminal station is turned on, the number (or probability) is higher than the number (or probability) of the control channel acquisition frequency (or probability) distribution for each channel of the image stored in the nonvolatile memory 462 as shown in FIG. A first group of a plurality of control channel candidates is selected (FIG. 6, S1). Next, whether the control channel is a control channel is checked by measuring the input voltage of each channel of the first group and the signal content, and the control channel and the channel whose input voltage is higher than a specified value usually specified in the service area are determined. It captures as the control channel to be used, sets the area mode, and enters normal operation (S2, S3). When the station closing operation is performed (S4), the number of acquisitions of the control channel acquired by various procedures during the opening of the station is counted, statistical processing is performed together with the past accumulated data, and the number of acquisitions of the control channel in the nonvolatile memory 462 ( Or (probability) distribution is updated (S5), and power is turned off.
ステップS2で規定値以上の電界の制御チャネルがな
く、制御チャネルが捕捉できなかった場合は、制御チャ
ネル捕捉回数（又は確率）分布から捕捉履歴のあるチャ
ネルを全て第２群とし（S6）、その中から前記と同様に
して制御チャネルを捕捉する（S7,S37）。If there is no control channel of the electric field equal to or greater than the specified value in step S2 and the control channel cannot be captured, all channels having a capture history from the control channel capture count (or probability) distribution are set as a second group (S6). From the inside, the control channel is captured in the same manner as above (S7, S37).
さらにそれでも捕捉できなかった場合は、前記の第１
群及び第２群の中から受信可能な制御チャネルを捕捉す
る（S8,S31）。If still not captured, the first
A receivable control channel is captured from the group and the second group (S8, S31).
さらに捕捉できなかった場合は、残ったチャネルの中
から制御チャネルで且つ前記同様の規定値以上の制御チ
ャネルを捕捉する（S9,S3）。Further, when the control channel cannot be captured, the control channel is captured from among the remaining channels as a control channel having a value equal to or greater than the specified value (S9, S3).
さらに、捕捉できなかった場合は、上記の残ったチャ
ネルの中から受信可能な制御チャネルを捕捉する（S10,
S3）。Further, if the control channel could not be captured, a receivable control channel is captured from the remaining channels (S10,
S3).
それでも捕捉できなかった場合は、圏外モードを設定
して（S11）再度制御チャネルの捕捉動作をくり返す。If it is still not possible to capture, the out-of-service mode is set (S11), and the control channel capturing operation is repeated again.
以上説明したように本発明は、基地局においては制御
チャネルの割当てを任意に設定できるようにし、端末局
においては制御チャネルの走査に学習機能を持たせるこ
とにより、システムのチャネル計画において予め制御チ
ャネルを固定的に定めておく必要がなく柔軟性のあるチ
ャネル計画を立てられる効果がある。As described above, the present invention allows a base station to arbitrarily set the assignment of a control channel, and a terminal station having a learning function for scanning a control channel. Is not required to be fixed, and a flexible channel plan can be created.
第１図は本発明の一実施例を示すブロック図、第２図は
第１図における基地局１のブロック図、第３図は同じく
端末局４のブロック図、第４図は第１の実施例における
基地局の送信する制御チャネルのフォーマットを示す
図、第５図は第４図における不揮発性メモリ462の記憶
内容を説明するための図、第６図は第１図の実施例にお
ける端末局の制御チャネル捕捉のフローチャートであ
る。 １〜３……基地局、４〜６……端末局、７……運用セン
タ、８……交換局、９……加入者電話、15……送信機、
16……受信機、17……無線制御部、43……送信部、44…
…受信部、45……シンセサイザ、46……制御部、461…
…統計処理部、462……不揮発性メモリ。FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram of a base station 1 in FIG. 1, FIG. 3 is a block diagram of a terminal station 4 in the same manner, and FIG. FIG. 5 is a diagram showing a format of a control channel transmitted by the base station in the example, FIG. 5 is a diagram for explaining the storage contents of the nonvolatile memory 462 in FIG. 4, and FIG. 6 is a terminal station in the embodiment of FIG. 6 is a flowchart of control channel acquisition of FIG. 1-3 base station, 4-6 terminal station, 7 operation center, 8 switching station, 9 subscriber telephone, 15 transmitter,
16: Receiver, 17: Wireless controller, 43: Transmitter, 44 ...
... Receiver, 45 ... Synthesizer, 46 ... Controller, 461 ...
Statistic processing unit 462 Non-volatile memory
Claims (1)
れている複数の無線チャネルを通信チャネル及び制御チ
ャネルに用いる移動通信システムにおいて、前記無線チ
ャネルを変えることなく前記通話チャネル及び前記制御
チャネルのいずれにも設定でき前記制御チャネルとして
設定されたとき前記制御チャネルであることを示す信号
を周期的に送出する複数の第１の送受信機を備えた基地
局と、前記無線チャネルのいずれにも同調可能な第２の
送受信機、前回開局中の前記制御チャネルの前記無線チ
ャネルごとの捕捉回数の分布を示すデータを記憶する書
替え可能な不揮発性メモリ、及び、この不揮発性メモリ
の記憶内容と前記第２の送受信機の受信入力電界と前記
第２の送受信機の受信信号中の前記制御チャネルである
ことを示す前記信号とから前記第２の送受信機を制御し
て前記制御チャネルを走査捕捉し今回開局後の前記制御
チャネルの前記無線チャネルごとの捕捉回数を計数し計
数結果により前記不揮発性メモリの記憶内容を閉局時に
更新する制御部を備えた端末局とを具備することを特徴
とする移動通信システム。1. A mobile communication system in which a plurality of radio channels whose transmission and reception frequencies are respectively predetermined are used as a communication channel and a control channel, are set to both the communication channel and the control channel without changing the radio channel. A base station having a plurality of first transceivers for periodically transmitting a signal indicating the control channel when set as the control channel; and a second station tunable to any of the radio channels. Transceiver, a rewritable nonvolatile memory for storing data indicating a distribution of the number of acquisitions of the control channel for each of the radio channels that was previously opened, a storage content of the nonvolatile memory, and the second transceiver And the signal indicating the control channel in the received signal of the second transceiver. And controlling the second transceiver to scan and capture the control channel, count the number of captures of the control channel for each wireless channel after the current channel is opened, and store the contents of the nonvolatile memory according to the counting result when the station is closed. A mobile communication system comprising: a terminal station having a control unit for updating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2129812A JP2830374B2 (en) | 1990-05-18 | 1990-05-18 | Mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2129812A JP2830374B2 (en) | 1990-05-18 | 1990-05-18 | Mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0425230A JPH0425230A (en) | 1992-01-29 |
| JP2830374B2 true JP2830374B2 (en) | 1998-12-02 |
Family
ID=15018834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2129812A Expired - Fee Related JP2830374B2 (en) | 1990-05-18 | 1990-05-18 | Mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2830374B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4609900B2 (en) * | 2007-09-14 | 2011-01-12 | キャタピラー エス エー アール エル | Work lever mounting body flip-up device for work machines |
-
1990
- 1990-05-18 JP JP2129812A patent/JP2830374B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0425230A (en) | 1992-01-29 |
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