JPH0473646B2 - - Google Patents
Info
- Publication number
- JPH0473646B2 JPH0473646B2 JP59093220A JP9322084A JPH0473646B2 JP H0473646 B2 JPH0473646 B2 JP H0473646B2 JP 59093220 A JP59093220 A JP 59093220A JP 9322084 A JP9322084 A JP 9322084A JP H0473646 B2 JPH0473646 B2 JP H0473646B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- base station
- antenna
- mobile
- 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
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 230000005684 electric field Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2621—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using frequency division multiple access [FDMA]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】
本発明は、サービス圏内における基地局を介し
た他の移動局との通信の他に、サービス圏外にお
ける他の移動局との直接通信をも、一台の装置で
行なえるようにした移動無線通信装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention enables not only communication with other mobile stations within the service area via a base station, but also direct communication with other mobile stations outside the service area with a single device. The present invention relates to a mobile radio communication device configured to have a mobile radio communication device.
内航船舶通信方式においては、第１図に示すよ
うに、基地局１のサービス圏内Ａにいる移動局１
１，１２と基地局１との間の無線通信は、移動局
１１，１２側からの基地局１への送信を周波数fT
でおこない、基地局１からの受信を周波数fRで行
なう（複信通信）ように定められていて、サービ
ス圏内Ａにいる移動局１１と移動局１２との相互
間の無線通信は、基地局１を介して行なうことが
できる。このためサービス圏内Ａにおいては、移
動局１１，１２には、第２図に示すように周波数
fTで送信を行なう送信機２１と、周波数fRで受信
を行なう受信機２２と、アンテナ共用器２３及び
アンテナ２４からなる無線装置を備えておれば充
分である。 In the domestic vessel communication system, as shown in FIG.
Wireless communication between mobile stations 1 and 12 and base station 1 involves transmission from mobile stations 11 and 12 to base station 1 at frequency f T
The wireless communication between mobile station 11 and mobile station 12 within service area A is determined to be carried out at frequency fR and reception from base station 1 is performed at frequency fR (duplex communication). This can be done via 1. Therefore, within the service area A, the mobile stations 11 and 12 have different frequencies as shown in FIG.
It is sufficient to have a radio device consisting of a transmitter 21 that transmits at fT , a receiver 22 that receives at frequency fR , an antenna duplexer 23, and an antenna 24.
しかし、基地局１のサービス圏内Ａは、通話品
質の確保できる半径50〜100Kmまでの範囲である。
従つて第１図に示すように、サービス圏外Ｂにい
る移動局３１，３２には基地局１による通話サー
ビスが付加となり、基地局１を介した移動局３１
と移動局３２との相互間の通信はできない。 However, the service area A of the base station 1 is within a radius of 50 to 100 km within which call quality can be ensured.
Therefore, as shown in FIG. 1, the mobile stations 31 and 32 located outside the service area B are provided with a call service provided by the base station 1, and the mobile stations 31 and 32 located outside the service area
Communication between the mobile station 32 and the mobile station 32 is not possible.
このため、例えば、船団を組んで行動する船の
移動局の場合には、サービス圏外Ｂでは相互の連
絡ができずに不便であり、このため第２図に示し
た無線装置の他に、直接他の移動局と通信を行な
うための他の周波数帯の無線機を使用するしか方
法がなかつた。しかし、このように直接移動局相
互に通信するために新たな他の周波数帯の無線機
をさらに一台増設することは、周波数の有効利
用、設備投資の面から好ましくなかつた。 For this reason, for example, in the case of mobile stations on ships operating in a convoy, it is inconvenient that they cannot communicate with each other outside the service area B. The only option was to use radio equipment in other frequency bands to communicate with other mobile stations. However, it is not desirable from the standpoint of effective use of frequencies and capital investment to add another new radio device using a different frequency band in order to directly communicate with each other in this manner.
本発明はこの問題を解決するためになされたも
ので、サービス圏内Ａにおける基地局を介した他
の移動局との通信と、サービス圏外Ｂにおける他
の移動局との直接通信との双方を、一台の装置で
行なえるようにした移動無線通信装置を提供する
ことを目的としている。 The present invention was made to solve this problem, and allows communication with other mobile stations via a base station within the service area A and direct communication with other mobile stations outside the service area B. It is an object of the present invention to provide a mobile radio communication device that can perform communication with a single device.
以下、図面に基づいて本発明の一実施例を説明
する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.
第３図は、移動局に備える本発明の一実施例に
よる移動無線通信装置の構成を示すブロツク図で
ある。 FIG. 3 is a block diagram showing the configuration of a mobile radio communication device according to an embodiment of the present invention provided in a mobile station.
同図において、４１は、周波数fTで送信を行な
う送信機、４２は周波数fRで受信を行なう受信
機、４３はアンテナ共用器、４４はアンテナであ
つて、これらは第２図に示したものと同一であ
る。 In the figure, 41 is a transmitter that transmits at frequency f T , 42 is a receiver that receives at frequency f R , 43 is an antenna duplexer, and 44 is an antenna, which are shown in FIG. It is the same as the thing.
４５は、受信機４２の基地局１からの受信信号
強度が所定値（サービス圏内Ａにおける基地局１
からの受信レベルの最低値）を下回ると検知信号
を出力する検知回路である。 45 indicates that the reception signal strength of the receiver 42 from the base station 1 is a predetermined value (base station 1 in service area A).
This is a detection circuit that outputs a detection signal when the reception level from the
４６はこの検知回路４５からの検知信号を受け
ると切換信号を出力する切換制御回路である。 46 is a switching control circuit which outputs a switching signal upon receiving the detection signal from the detection circuit 45.
４７は、送信を行なう場合及びこの切換制御回
路４６からの切換信号が出力されていない場合は
接点ａ−a′に接続されていて、切換信号を受ける
と接点ａ−a′から接点ｂ−b′へ切換えられる切換
スイツチである。 47 is connected to the contacts a-a' when transmitting and when the switching signal from the switching control circuit 46 is not output, and when it receives the switching signal, it is connected from the contacts a-a' to the contacts b-b. This is a changeover switch that can be switched to .
４８はアンテナ４４から入力した信号の周波数
fTをfRに変換する周波数変換器である。 48 is the frequency of the signal input from the antenna 44
This is a frequency converter that converts f T to f R.
次に上記実施例の動作を説明する。 Next, the operation of the above embodiment will be explained.
移動局がサービス圏内Ａにいるときは、基地局
１からの電波を受けた受信機４２の受信レベルが
所定値以上であるから、切換スイツチはａ−a′側
に接続されている。この状態は第２図と同一であ
るから、送信周波数fT、受信周波数fRによる複信
通信を行なう。即ち、送信機４１から周波数fTで
基地局１へ送信を行ない、受信機４２で基地局１
からの周波数fRを受信することができ、サービス
圏内Ａの２つの移動局１１，１２は基地局１を介
して通信できる。 When the mobile station is within the service area A, the reception level of the receiver 42 receiving radio waves from the base station 1 is above a predetermined value, so the changeover switch is connected to the a-a' side. Since this state is the same as in FIG. 2, duplex communication is performed using the transmission frequency f T and the reception frequency f R. That is, the transmitter 41 transmits to the base station 1 at the frequency fT , and the receiver 42 transmits to the base station 1.
The two mobile stations 11 and 12 within the service area A can communicate via the base station 1.
移動局がサービス圏外Ｂに出ると、基地局１か
らの電波の電界強度が低下するから、受信機４２
の受信レベルは所定値を下回る。検知回路４５は
これを検知して検知信号を出力する。切換制御回
路４６はこれを受けて切換スイツチ４７をｂ−
b′側に切換える。 When the mobile station goes outside the service area B, the field strength of the radio waves from the base station 1 decreases, so the receiver 42
The reception level of is below a predetermined value. The detection circuit 45 detects this and outputs a detection signal. In response to this, the switching control circuit 46 switches the switching switch 47 to b-
Switch to b′ side.
この状態においてサービス圏外Ｂにいる他の移
動局からの周波数fTの送信があると、アンテナ４
４で受波され、周波数変換器４８で周波数fTはfR
に変換され、受信機４２で受信される。送信時は
切換スイツチ４７がａ−a′側に切換えられて、送
信機４１によつて周波数fTで送信を行なう。 In this state, if there is a transmission on the frequency f T from another mobile station outside the service area B, the antenna 4
4, and the frequency f T is changed to f R by the frequency converter 48.
and received by the receiver 42. At the time of transmission, the changeover switch 47 is switched to the a-a' side, and the transmitter 41 transmits at the frequency fT .
このようにサービス圏外Ｂでは切換スイツチ４
７は自動的にｂ−b′側に切換えられるから、サー
ビス圏外Ｂにいるある移動局（例えば３１）が基
地局１への送信に用いるのと同じ送信周波数fTで
送信すれば、他の移動局（例えば３２）では自動
的に基地局１からの受信に用いるのと同じ受信周
波数fRに変換されて受信されるから、移動局相互
の直接通信ができる。従つてサービス圏内Ａでは
送信周波数fT、受信周波数fRによる複信通信を行
ない、サービス圏外Ｂでは送信周波数及び受信周
波数がfTの単信通信を行なえばよい。 In this way, when B is outside the service area, selector switch 4
7 is automatically switched to the b-b' side, so if a certain mobile station (for example, 31) outside the service area B transmits at the same transmission frequency f T used for transmission to base station 1, other mobile stations The mobile station (for example, 32) automatically converts the signal to the same reception frequency f R used for reception from the base station 1 and receives it, so that direct communication between the mobile stations is possible. Therefore, in the service area A, duplex communication is performed using the transmission frequency f T and the reception frequency f R , and in the outside service area B, simplex communication is performed with the transmission frequency and the reception frequency f T .
本発明は上記のように構成されているので、
(1) サービス圏内Ａでの基地局１を介した他の移
動局との通信と、サービス圏外Ｂにおける他の
移動局との直接通信との双方を一台の装置で行
なうことができる。 Since the present invention is configured as described above, (1) communication with other mobile stations via base station 1 in service area A and direct communication with other mobile stations in outside service area B; Both can be done with one device.
(2) 従来装置に簡単な付加回路を設けるだけでよ
いので経済的である。(2) It is economical because it is only necessary to provide a simple additional circuit to the conventional device.
(3) 特に、小型船舶ではアンテナ設置のスペー
ス、別の装置設置のスペースが少ないため有益
である。(3) This is especially useful on small ships, since there is less space for installing antennas and other equipment.
(4) 主サービスシステムの持つ機能（例えば秘話
回路）等がそのまま利用できる。(4) The functions of the main service system (for example, secret communication circuit) can be used as is.
(5) サービス圏外Ｂでの直接通話を追加しても使
用周波数を増加しなくてよいので電波の有効利
用が図られる。(5) Even if direct calls are added outside the service area B, there is no need to increase the frequency used, so radio waves can be used effectively.
第１図は移動局の通信方式を示す説明図、第２
図は従来の移動無線装置を示すブロツク図、第３
図は本発明の一実施例を示すブロツク図である。
１……基地局、Ａ……サービス圏内、Ｂ……サ
ービス圏外、１１，１２……移動局、３１，３２
……移動局、４１……送信機、４２……受信機、
４３……アンテナ共用器、４４……アンテナ、４
５……検知回路、４６……切換制御回路、４７…
…切換スイツチ、４８……周波数変換器。
Figure 1 is an explanatory diagram showing the mobile station communication method, Figure 2
Figure 3 is a block diagram showing a conventional mobile radio device.
The figure is a block diagram showing one embodiment of the present invention. 1... Base station, A... Within service area, B... Out of service area, 11, 12... Mobile station, 31, 32
...Mobile station, 41...Transmitter, 42...Receiver,
43...Antenna duplexer, 44...Antenna, 4
5...Detection circuit, 46...Switching control circuit, 47...
...Selector switch, 48...Frequency converter.
Claims (1)
るための送信機と、予め決められた周波数fR（fR
≠fT）の無線信号を受信するための受信機と、無
線信号送受用のアンテナと、前記送信機の送信信
号を前記アンテナ側へ出力し、前記アンテナ側で
受信される信号を前記受信機に入力するアンテナ
共用器とを有し、 基地局から送信される周波数fRの無線信号を前
記受信機で受信し、基地局に対して前記送信機か
ら周波数fTの無線信号を送信する移動局の移動無
線通信装置において、 該移動局の位置が前記基地局のサービス圏内に
あるか否かを、前記受信機で受信した前記基地局
からの周波数fRの無線信号の受信信号強度の大き
さによつて検知する検知手段と、 周波数fTの信号を周波数fRの信号に変換する周
波数コンバータと、 前記検知手段によつて、該移動局が前記基地局
のサービス圏内にあると検知された場合には、前
記アンテナと前記アンテナ共用器との間を直結し
て、前記基地局に対して周波数fTと周波数fRの無
線信号による復信通信を可能にし、該移動局が前
記基地局のサービス圏外にあると検知された場合
には、受信時のみ前記アンテナと前記アンテナ共
用器との間に前記周波数コンバータを介在させ
て、前記基地局のサービス圏外にある他の移動局
に対して周波数fTの無線信号による単信通信を可
能にする切換器とを備えたことを特徴とする移動
無線通信装置。 ２ 前記検知手段は、該移動局が前記基地局のサ
ービス圏外に位置していることを、周波数fRの無
線信号を受信したときの受信信号のＳ／Ｎ値又は
電界強度が所定値以下になつたときに検知するこ
とを特徴とする特許請求の範囲第１項記載の移動
無線通信装置。[Claims] 1. A transmitter for transmitting a radio signal with a predetermined frequency f T and a transmitter with a predetermined frequency f R (f R
≠ f T ), a receiver for receiving a wireless signal, an antenna for transmitting and receiving a wireless signal, outputting a transmission signal from the transmitter to the antenna side, and transmitting a signal received by the antenna side to the receiver. an antenna duplexer input to the base station, the receiver receives a radio signal with a frequency f R transmitted from a base station, and the transmitter transmits a radio signal with a frequency f T to the base station. In a mobile radio communication device of a station, whether or not the location of the mobile station is within the service area of the base station is determined based on the received signal strength of a radio signal of frequency f R from the base station received by the receiver. a frequency converter that converts a signal with a frequency f T into a signal with a frequency f R; and a frequency converter that converts a signal with a frequency f T into a signal with a frequency f R; In this case, the antenna and the antenna duplexer are directly connected to enable repeat communication with the base station using radio signals of frequencies f T and f R , and the mobile station is connected to the base station. If it is detected that the mobile station is outside the service area of the base station, the frequency converter is interposed between the antenna and the antenna duplexer only during reception, and the frequency converter is inserted between the antenna and the antenna duplexer to transmit signals to other mobile stations outside the service area of the base station. 1. A mobile radio communication device comprising: a switching device that enables simplex communication using a radio signal of frequency fT . 2 The detection means detects that the mobile station is located outside the service area of the base station by detecting that the S/N value or electric field strength of the received signal when receiving the radio signal of frequency f R is below a predetermined value. 2. The mobile radio communication device according to claim 1, wherein the mobile radio communication device detects when the mobile radio communication device becomes tired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59093220A JPS60236332A (en) | 1984-05-09 | 1984-05-09 | Mobile radio communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59093220A JPS60236332A (en) | 1984-05-09 | 1984-05-09 | Mobile radio communication equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60236332A JPS60236332A (en) | 1985-11-25 |
| JPH0473646B2 true JPH0473646B2 (en) | 1992-11-24 |
Family
ID=14076472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59093220A Granted JPS60236332A (en) | 1984-05-09 | 1984-05-09 | Mobile radio communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60236332A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2730553B2 (en) * | 1988-08-29 | 1998-03-25 | 富士通株式会社 | Simplex wireless transceiver |
| JP2001095043A (en) * | 1999-09-20 | 2001-04-06 | Fujitsu General Ltd | Radio communicattion system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390811A (en) * | 1977-01-21 | 1978-08-10 | Saibanetsuto Kougiyou Kk | Simplex and duplex more pll synthesizer |
| JPS5620341A (en) * | 1979-07-30 | 1981-02-25 | Nippon Telegr & Teleph Corp <Ntt> | Terminal equipment for car telephone with electric field intensity display |
-
1984
- 1984-05-09 JP JP59093220A patent/JPS60236332A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5390811A (en) * | 1977-01-21 | 1978-08-10 | Saibanetsuto Kougiyou Kk | Simplex and duplex more pll synthesizer |
| JPS5620341A (en) * | 1979-07-30 | 1981-02-25 | Nippon Telegr & Teleph Corp <Ntt> | Terminal equipment for car telephone with electric field intensity display |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60236332A (en) | 1985-11-25 |
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