JPS63215230A - Radio channel switching method - Google Patents
Radio channel switching methodInfo
- Publication number
- JPS63215230A JPS63215230A JP62049514A JP4951487A JPS63215230A JP S63215230 A JPS63215230 A JP S63215230A JP 62049514 A JP62049514 A JP 62049514A JP 4951487 A JP4951487 A JP 4951487A JP S63215230 A JPS63215230 A JP S63215230A
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- Prior art keywords
- channel
- radio
- wireless
- base station
- communication channel
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- 238000000034 method Methods 0.000 title claims description 10
- 238000004891 communication Methods 0.000 claims abstract description 45
- 238000010295 mobile communication Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 abstract description 17
- 238000010079 rubber tapping Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は無線通信のサービスエリア全体を複数の小無線
ゾーンに分割すると共に各小無線ゾーンに対して複数の
周波数を割り当て、該周波数を用いて移動機と前記小無
線ゾーンに各々配設された無線基地局間で通話を行なう
移動通信の無線チャンネル切換方法に関するものである
。Detailed Description of the Invention (a) Industrial Application Field The present invention divides the entire wireless communication service area into a plurality of small wireless zones, allocates a plurality of frequencies to each small wireless zone, and divides the frequency. The present invention relates to a wireless channel switching method for mobile communications in which a mobile device and wireless base stations installed in each of the small wireless zones communicate using the present invention.
（ロ）従来の技術
従来、自動車電話のような移動通信では、例えは昭和６
０年２月１０日社団法人電子通信学会より発行された「
自動車電話」に記載されているように電波の有効利用を
計るために、無線通信のサービスエリア全体を複数の小
無線ゾーンに分割する「小ゾーン構成」を採用している
。斯様にして、同一周波数の無線チャンネルを地理的に
慝れた場所で繰９返えし使用することも可能にし、また
一つの無線チャンネルを多数の移動機によシ時間的に多
重可能にしている。このため、発瀦呼に応じて移動機の
存在する小熱線ゾーン金検出した上で、無線チャンネル
を割り当て、複数の小無線ゾーン全移動しながら、通話
を行なう移動機に対しては、通話中の無線チャンネルを
切換える必要が生じる。(b) Conventional technology Traditionally, in mobile communications such as car telephones,
Published by the Institute of Electronics and Communication Engineers on February 10th,
In order to make effective use of radio waves, as described in ``Car Telephones'', a ``small zone configuration'' is adopted in which the entire wireless communication service area is divided into multiple small wireless zones. In this way, it is possible to use the same frequency radio channel repeatedly in geographically isolated locations, and it is also possible to temporally multiplex one radio channel to a large number of mobile devices. ing. Therefore, in response to an outgoing call, the mobile device detects the small hot wire zone in which the mobile device is located, and then assigns a wireless channel to the mobile device that makes a call while moving through multiple small wireless zones. It becomes necessary to switch the wireless channel.
斯る無線チャンネルの切換について、第２図を参照し１
説明する。Regarding such wireless channel switching, please refer to Figure 2.
explain.
第２図において、小無線ゾーンＣＢ）で通話をしていた
移動機（１：が小無線ゾーン（０）の方向に移動すると
、移動機［１１からの通話チャンネルの受信レベルを常
時監視している無線基地局（２）内の通話チャンネル受
信機は、受信レベルが規定値以下に低下したことで移動
機（１）が自ゾーンから外へ移動しつつあることを知る
。In Figure 2, when the mobile device (1:) that was talking in the small wireless zone (CB) moves toward the small wireless zone (0), the reception level of the communication channel from the mobile device [11] is constantly monitored. The communication channel receiver in the wireless base station (2) that is currently located knows that the mobile device (1) is moving out of its own zone because the reception level has fallen below a specified value.
無線基地局（２）はその通話チャンネルのレベル劣化を
無線回線制御局（３）に通知し、無線回線制御局（３）
はこれに基づいて小無線ゾーンの）及びその周辺の小無
線ゾーンの無線基地局に対して、その通話チャンネルの
受信レベルの監視を行なうする指示する。各無線基地局
は、制御用及び通話用受信機のほかに、通話中チャンネ
ル切換のための受信レベルの監視を行うＳ／Ｎ監視用受
信機を有しており、前者の受信周波数が固定であるのに
対して、後者は外部からの指令により自動車電話システ
ム内の任意の１チヤンネルに切シ換えられるようになさ
れている。The radio base station (2) notifies the radio network control station (3) of the level deterioration of the communication channel, and the radio network control station (3)
Based on this, the radio base stations in the small radio zone) and the surrounding small radio zones are instructed to monitor the reception level of the communication channel. In addition to control and telephone receivers, each radio base station has an S/N monitoring receiver that monitors the reception level for channel switching during a telephone call.The reception frequency of the former is fixed. On the other hand, the latter can be switched to any one channel within the car telephone system by an external command.
示に基づいてＳ／Ｎ監視用受信機の受信チャンネルをそ
の通話チャンネルに切シ換えて移動機からの電波の受信
レベルを測定し、その結果を無線回線制御局（３）に報
告する。Based on the indication, the reception channel of the S/N monitoring receiver is switched to the communication channel, the reception level of the radio wave from the mobile device is measured, and the result is reported to the radio network control station (3).
各無線基地局＋２＋ｔ２ｉ＋２＋からのレベル報告を受
けた無線回線制御局（３）は、最も受信レベルの高かっ
た小無線ゾーンを移動機１１１の移行先ゾーンと判断す
る。このゾーンが元のゾーンである場合には、移動機＋
１１がゾーンを移行したというよりは、一時的にレベル
が低下しその後回復したと判断し、以下の通話中チャン
ネル切換の動作は行わない。The radio network control station (3) that receives the level reports from each radio base station +2+t2i+2+ determines the small radio zone with the highest reception level as the destination zone for the mobile device 111. If this zone is the original zone, the mobile +
11 has changed zones, but rather that the level has temporarily decreased and then recovered, and the following channel switching operation during a call is not performed.
元のゾーン以外の場合には、通話中チャンネル切換とし
て、最高レベルの小無線ゾーン（０）の空き通話チャン
ネル′Ｊｋ１つ選択しＪ自動車電話交換局（４）Ｋ対し
て、無線回線制御局（３）との間の回線を通話中のＢゾ
ーンのチャンネルからＯゾーンのこのチャンネルに切換
えるよう依頼する。In the case of a zone other than the original zone, select one free call channel 'Jk of the highest level small wireless zone (0) as a channel change during a call, and send it to the J mobile telephone exchange (4) K to the wireless line control station ( 3) Request that the line between them be switched from the channel in the B zone where the call is being made to this channel in the O zone.
交換局（４）は新しい通話チャンネルについて、無線基
地局（２１との間で有線導通試験を実施する。そして、
試験結果が良好であれば、元の無線基地局の通話チャン
ネルを通して新しい通話チャンネルに切り換えるよう、
通話中チャンネル切換信号を送出する。The exchange (4) conducts a wired continuity test with the wireless base station (21) regarding the new communication channel.
If the test result is good, the system will switch to the new communication channel through the original radio base station communication channel.
Sends a channel switching signal during a call.
移動機ｆｉｌはこの切換信号に従って新しい通話チャン
ネルに切り換え、新しい無線ゾーン（０）の無線基地局
（２【との間で新しい通話チャンネルについて無線導通
試験を実施する。そして、試験結果が良好であれば、自
動車電話交換局（４）は通話路をＢゾーン内の旧チャン
ネルからＯゾーン内の新チャンネルへと切り換えて通話
を継続させる。The mobile device fil switches to a new communication channel according to this switching signal, and performs a radio continuity test on the new communication channel with the wireless base station (2) in the new wireless zone (0). For example, the mobile telephone exchange (4) switches the call path from the old channel in the B zone to the new channel in the O zone to continue the call.
斯様にして通話中チャンネル切換動作は達成される。尚
、第２図において、（５）は中継線交換局、（６）ハ加
入者線交換局、【７１は一般加入者電話である。In this way, the mid-call channel switching operation is accomplished. In FIG. 2, (5) is a trunk line exchange, (6) C is a subscriber line exchange, and 71 is a general subscriber telephone.
（ハ）発明が解決しようとする問題点
上記自動車電話システムでは、通話チャンネルの切換は
小無線ゾーン間の移動時にのみ行なわれるため、同一ゾ
ーンにて通話を行う際、同一周波数帯を有する受信機に
てその通話内容を簡単に盗聴されてしまうという問題が
ある。(c) Problems to be Solved by the Invention In the above-mentioned car phone system, switching of call channels is performed only when moving between small wireless zones. There is a problem that the contents of the call can be easily intercepted.
そこで、音声信号を一定の法則にてスクランブルして送
出し、受信機側でこれを元の音声に戻すことにより秘話
性を高めるようにしたものが提案されているが、斯る秘
話装置は高価であり、システム全体の価格を向上させて
しまうという問題がある。Therefore, a method has been proposed in which the audio signal is scrambled according to a certain rule and sent out, and then returned to the original audio on the receiver side to improve the privacy of the conversation.However, such a privacy device is expensive. Therefore, there is a problem that the price of the entire system increases.
に）問題点を解決するための手段
上記の問題点に鑑み、本発明は無線通信のサービスエリ
ア全体を複数の小無線ゾーンに分割すると共に各小無線
ゾーンに対して複数の周波数を割り当て、該周波数を用
いて移動機と前記小無線ゾーンに各々配設された無線基
地局間で通話を行なう移動通信の無線チャンネル切換方
法であって、移動機と無線基地局間の通話で使用する無
線チャンネルの周波数を一定時間毎に切換えるようにし
た無線チャンネル切換方法を提供するものである。B) Means for Solving the Problems In view of the above problems, the present invention divides the entire wireless communication service area into a plurality of small wireless zones, allocates a plurality of frequencies to each small wireless zone, and divides the entire wireless communication service area into a plurality of small wireless zones. A wireless channel switching method for mobile communications that uses frequencies to conduct calls between a mobile device and a wireless base station installed in each of the small wireless zones, the wireless channel used for calls between the mobile device and the wireless base station. The present invention provides a wireless channel switching method in which the frequency of the radio channel is switched at regular intervals.
（ホ）作 用
本発明に依れば、同一無線ゾーン内の通話であっても、
一定時間毎に使用無線チャンネルの周波数を切換えるこ
とにより、ＷＪ３者にて通話内容を継続して盗聴されな
いようにした。(E) Effect According to the present invention, even if calls are within the same wireless zone,
By switching the frequency of the radio channel used at regular intervals, the contents of the call were not continuously eavesdropped on by the three WJ parties.
（へ）実施例
第１図は本発明の一実施例を示す図であり、第２図と同
一部分には同一符号を付すと共にその説明を省略する。(f) Embodiment FIG. 1 is a diagram showing an embodiment of the present invention, and the same parts as in FIG. 2 are given the same reference numerals, and their explanation will be omitted.
先ず、移動機（１１からの発呼動作について説明する。First, the calling operation from the mobile device (11) will be explained.
移動加入者がオフフックすると、移動機本体が該オフフ
ックを検出して電話機に対して発信音を送出する。然る
後、加入者のダイヤル毎にダイヤル数字が２進符号で移
動体本体に伝送され、ここで一時記憶される。When a mobile subscriber goes off-hook, the mobile station detects the off-hook and sends a dial tone to the telephone. Thereafter, each time a subscriber dials, the dialed digits are transmitted in binary code to the mobile body, where they are temporarily stored.
こｎと同時に移動機（１）から発信制御チャンネルで発
呼信号を送出する。各無線基地局＋２ｏ２１（ｆ＋では
、この発呼信号を受信して無線回線制御局（３）に中継
し、無線回線制御局（３）では発呼信号に付加された受
信レベルを比較することにより、移動機＋１＋からの信
号を最も高いレベルで受信した無線基地局（２）を移動
機の在圏無線ゾーンと判断する。この無線ゾーンの通話
チャンネルの内、使用されていないチャンネルを１つ選
択して、そのチャンネル番号を無線基地局（２）を介し
て移動機［１１に指定する。無線基地局（２）はチャン
ネル指定信号を発信制御チャンネルで移動機に送出する
。移動機（１）はこれに応答して指定された通話チャン
ネルに切換える。At the same time, the mobile device (1) sends out a calling signal on the calling control channel. Each radio base station +2o21 (f+ receives this calling signal and relays it to the radio network control station (3), and the radio network control station (3) compares the reception level added to the calling signal. , determines that the wireless base station (2) that received the signal from the mobile device +1+ at the highest level is the wireless zone where the mobile device is located.Selects one channel that is not in use among the communication channels in this wireless zone. and designates the channel number to the mobile device [11] via the radio base station (2).The radio base station (2) sends a channel designation signal to the mobile device on the transmission control channel.Mobile device (1) responds to this by switching to the designated communication channel.
無線基地局（２）は、移動機（１）が指定した通話チャ
ンネルに正しく切換えられたかを確認するために、指定
した通話チャンネルで移動機（１１に対して下シ無線導
通試験信号を送出する。The radio base station (2) sends a radio continuity test signal to the mobile device (11) on the specified communication channel in order to confirm whether the mobile device (1) has correctly switched to the specified communication channel. .
移動機＋１１はこれを検出して、上シ無線導通試験信号
を通話チャンネルで送出する。Mobile device +11 detects this and sends out an upper radio continuity test signal through the communication channel.
上り無線導通試験信号が受信された段階ではじめて、無
線回線制御局（３）は自動車電話交換局（４）に対して
発呼信号を送出する。尚、この発呼信号は、移動機番号
と指定通話チャンネルの識別番号とから構成されている
。Only when the uplink radio continuity test signal is received, the radio line control station (3) sends a call signal to the mobile telephone exchange (4). Incidentally, this calling signal is composed of a mobile device number and an identification number of a designated communication channel.
自動車電話交換局（４）は移動機番号からその加入者の
ホームメモリ局を割シ出し、その加入者データにアクセ
スして、接続してよい加入者であるか否かをチェックし
、接続可である場合には、自動車電話交換局〜無線基地
局の通話チャンネルについて有線導通試験を行う。The mobile telephone exchange (4) determines the subscriber's home memory station from the mobile device number, accesses the subscriber data, checks whether the subscriber is allowed to connect, and confirms whether the connection is possible. If so, conduct a wired continuity test on the communication channel between the mobile telephone exchange and the wireless base station.
導通試験が良好であれば、自動車電話交換局（４）から
移動機（１１までの通話路が正しく設定されたことにな
る。そこで無線基地局（２）から移動機ｉｌｌに対して
、通話チャンネルでダイヤル信号送出指令を送る。If the continuity test is good, it means that the communication path from the mobile telephone exchange (4) to the mobile device (11) has been set correctly.Then, the communication channel is set from the wireless base station (2) to the mobile device (ill). Sends a dial signal sending command.
移動機ｔｉ＋はこれに応答してそれまで一時記憶してあ
ったダイヤル数字を送出し、無線基地局（２）及び無線
回線制御局（３）はこれを自動車電話交換局（４）まで
中継する。In response to this, the mobile device ti+ sends out the dialed digits that had been temporarily stored, and the radio base station (2) and radio line control station (3) relay this to the mobile telephone exchange (4). .
そして、自動車電話交換局（４）はダイヤル数字に基づ
いて固定網等への接続を行う。The mobile telephone exchange (4) then connects to a fixed network or the like based on the dialed digits.
斯る固定網への接続の後、発呼先固定加入者がオフフッ
クすると、該オフフックを直流信号の変化として検出す
る固定加入者側交換機よシ通ｕ語開設信号が自動車電話
交換局（４）へ送出され、通話が可能となる。After connection to such a fixed network, when the called fixed subscriber goes off-hook, the fixed subscriber side exchange detects the off-hook as a change in the DC signal and transmits the U language opening signal to the mobile telephone exchange (4). , and you can make a call.
同時に、自動車電話交換局（４）は前記通話路開設信号
に基づきタイマー回路（８）を作動させ、時間Ｔ（Ｔは
数十秒）の計時を開始する。At the same time, the mobile telephone exchange (4) activates the timer circuit (8) based on the communication path opening signal, and starts counting the time T (T is several tens of seconds).
そして、タイマー回路（８）にて時間Ｔが計時されると
、自動車電話交換局（４）は、小無線ゾーンの空き通話
チャンネルを１つ選択した後、該通話チャンネルについ
て無線基地局（２）との間で有線導通試験を実施し、そ
の結果が良好であれば、現在使用中の通話チャンネル（
／２）ｉ−通して新しい通話チャンネルＣｆＳ ）に切
換えるよう、通話中チャンネル切換信号を送出する。移
動機はこれに応答して新しい通話チャンネルに切換え、
この２Ｉ！！砧チヤンネルにおいて無線基地局との間で
無線導通試′験を実施する。そして、その結果が良好で
あれば、新しい通話チャンネルに通話路を切換えて、通
話を継続させる〔第１図（ａ）（ｂ）参照〕。Then, when the timer circuit (8) measures the time T, the mobile telephone exchange (4) selects one free call channel in the small wireless zone, and then sends the call channel to the wireless base station (2). Conduct a wired continuity test with the current call channel (
/2) Send a busy channel switching signal to switch to a new conversation channel (CfS) through i-. In response, the mobile device switches to a new call channel,
This 2I! ! A wireless continuity test will be conducted with the wireless base station on the Kinuta channel. If the result is good, the communication path is switched to a new communication channel and the communication is continued [see FIGS. 1(a) and 1(b)].
尚、無線基地局（２）が複数の移動機１１１１１ｒと無
線通話路全開設している場合には、成る移動機の通話チ
ャンネル−を上述の方法にて切換えた後、他の移動機の
通話チャンネルを前記移動機の通話チャンネルに切換え
るようにすれば良い。If the wireless base station (2) has established all wireless communication channels with multiple mobile devices 11111r, after switching the communication channels of the mobile devices using the method described above, The channel may be switched to the communication channel of the mobile device.
次に、移動機（１）への着呼動作について説明する。Next, the operation of receiving a call to the mobile device (1) will be explained.
固定加入者がオフフックし、移動機の在圏していると思
われる地域番号及び移動加入者番号をダイヤルすると、
固定網交換局は地域番号に基づいて該当する自動車電話
交換局（４）まで接続する。When a fixed subscriber goes off-hook and dials the area number and mobile subscriber number where the mobile device is believed to be located,
The fixed network exchange connects to the corresponding mobile telephone exchange (4) based on the area code.
自動車電話交換局（４）は該当制御ゾーンを制御してい
る無線回線制御局（３）に対して着呼信号を送出し、無
線回線制御局（３）はこれに応答して配下の全無線基地
局を介して着信制御チャンネルで着呼信号を送出し、−
斉呼出しを行う。呼ばれた移動機は着呼応答信号を着信
制御チャンネルで送出し、−斉呼出しに答える。The mobile telephone exchange (4) sends an incoming call signal to the radio line control station (3) controlling the corresponding control zone, and the radio line control station (3) responds to this by calling all radio stations under its control. Send an incoming call signal on the incoming control channel via the base station, -
Make a simultaneous call. The called mobile station sends an incoming call response signal on the incoming call control channel and answers the general paging.
無線基地局（２＋＋２１＋２１は発呼の時と同様に受信
レベルの情報を付加してこｎを無線回線制御局（３）に
中継し、無線回線制御局（３）は受信レベルを比較する
ことにより移動機の在圏無線ゾーンを知り、そのゾーン
の空き通話チャンネルを一つ選択する。The radio base station (2++21+21) adds reception level information in the same way as when making a call and relays this to the radio network control station (3), and the radio network control station (3) moves by comparing the reception levels. Know the wireless zone in which the machine is located and select one of the free call channels in that zone.
無線回線制御局（３）ｆ′ｉ、交換局（４）にこの空き
通話チャンネルを通知し、交換局（４）はこの通話チャ
ンネルについて無線基地局までの有線導通試験を行い、
回線が正しく設定されていることを確認する。The wireless line control station (3) f'i notifies the switching center (4) of this vacant communication channel, and the switching center (4) conducts a wired continuity test on this communication channel to the wireless base station.
Verify that the line is configured correctly.
導通試験が良好のとき、無線回線制御局（３）から無線
基地局（２）ヲ介して着信制御チャンネルで移動機（１
）に対する通話チャンネルの指定をし、移動機のチャン
ネルをこれに切り換えさせる。同時に、無線基地局から
移動機までの無線導通試験を行う。When the continuity test is good, the mobile device (1
), and have the mobile device switch the channel to this channel. At the same time, a wireless continuity test from the wireless base station to the mobile device will be performed.
無線導通試験が良好であると、無線基地局（２）から移
動機ｆｉｌに対して通話チャンネルで、呼出し信号送出
指令を送出し、この指令を受けた移動機本体は呼出し信
号を発生させ、自動車電話機に送出する。If the radio continuity test is good, the wireless base station (2) sends a paging signal transmission command to the mobile device fil through the communication channel, and the mobile device receiving this command generates a paging signal and calls the mobile device fil. Send to phone.
また、無線回線制御局（３）は自動車電話交換局（４）
に対して無線導通試験確認全報告し、こｎ′ｆ：受けて
交換局（４）は発呼側加入者に対して、着呼側加入者を
呼び出し中であることを示す呼出し音を送出する。In addition, the radio line control station (3) is the car telephone exchange (4)
The exchange (4) then sends a full report of the radio continuity test confirmation to the calling subscriber and sends a ring tone to the calling subscriber indicating that the called subscriber is being called. do.
自動車電話加入者が応答し、オフフック状態になると、
移動機は応答信号を基地局に送出する。When the car phone subscriber answers and goes off-hook,
The mobile device sends a response signal to the base station.
自動車電話変換局は斯る応答信号に基づいてタイマー回
路（８）の計時動作を開始させ、そして時間Ｔｉ計時す
ると、発呼動作時と同様に通話チャンネルを切換える。The car telephone conversion station starts the timer circuit (8) to measure time based on the response signal, and when the time Ti has been counted, the communication channel is switched in the same manner as in the calling operation.
尚、本実施例では通話路開設信号若しくは応答信号にて
タイマー回路全作動させるようにしたが、タイマー回路
を常時動作させ、所定時間毎に出力さｎる計時信号にて
通話チャンネルを切換制御するようにしても良い。その
場合、発呼若しくは着呼動作中には通話チャンネル切換
制御を無効にする方が好ましい。In this embodiment, the timer circuit is fully activated by the call path establishment signal or the response signal, but the timer circuit is operated at all times, and the call channel is switched and controlled by the clock signal output at predetermined intervals. You can do it like this. In that case, it is preferable to disable the call channel switching control during the call originating or incoming call operation.
（ト）発明の効果
本発明に依れば、無線通信のサービスエリア全体を複数
の小無線ゾーンに分割すると共に各小無線ゾーンに対し
て複数の周波数を割り当て、該周波数を用いて移動機と
前記小無線ゾーンに各々配設された無線基地局間で通話
を行なう移動通信の無線チャンネル切換方法でありて、
移動体と無線基地局間の通話で使用する無線チャンネル
の周波数を一定時間毎に切換えるようにしたので、格別
な秘話装置を用いることなく、通話の秘匿性を向上させ
ることが出来る。(G) Effects of the Invention According to the present invention, the entire wireless communication service area is divided into a plurality of small radio zones, and a plurality of frequencies are assigned to each small radio zone, and the frequencies are used to communicate with mobile devices. A wireless channel switching method for mobile communication in which a call is made between wireless base stations arranged in each of the small wireless zones, the method comprising:
Since the frequency of the radio channel used in the call between the mobile body and the radio base station is switched at regular intervals, the confidentiality of the call can be improved without using a special privacy device.
第１図（ａ）（ｂ）は本発明の説明に供する図、第２図
は従来例の説明に供する図である。
ｔｔ＋１ｉｌ−秒＠ｍ、 ＩＺ＋１；ｄｌｌＺｌ−
ＩＦｉ’ｌｉ＃Ｍｊ＠句、（３）・・・無線回線制御局
、 （４）・・・自動車電話交換局。FIGS. 1(a) and 1(b) are diagrams for explaining the present invention, and FIG. 2 is a diagram for explaining a conventional example. tt+1il-sec@m, IZ+1;dllZl-
IFi'li#Mj@phrase, (3)...Radio line control station, (4)...Car telephone exchange.
Claims (1)
ーンに分割すると共に各小無線ゾーンに対して複数の周
波数を割り当て、該周波数を用いて移動機と前記小無線
ゾーンに各々配設された無線基地局間で通話を行なう移
動通信の無線チャンネル切換方法であって、移動体と無
線基地局間の通話で使用する無線チャンネルの周波数を
一定時間毎に切換えることを特徴とする無線チャンネル
切換方法。(1) The entire wireless communication service area is divided into a plurality of small wireless zones, and a plurality of frequencies are assigned to each small wireless zone, and each of the mobile terminals and the small wireless zone are allocated using the frequencies. A wireless channel switching method for mobile communications in which calls are made between wireless base stations, the method comprising switching the frequency of a wireless channel used in calls between a mobile object and a wireless base station at regular intervals. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62049514A JPS63215230A (en) | 1987-03-04 | 1987-03-04 | Radio channel switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62049514A JPS63215230A (en) | 1987-03-04 | 1987-03-04 | Radio channel switching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63215230A true JPS63215230A (en) | 1988-09-07 |
Family
ID=12833238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62049514A Pending JPS63215230A (en) | 1987-03-04 | 1987-03-04 | Radio channel switching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63215230A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04192821A (en) * | 1990-11-27 | 1992-07-13 | Nec Corp | Privacy communication system by switching radio channel |
| JPH04260990A (en) * | 1991-01-25 | 1992-09-16 | Mitsubishi Electric Corp | Contactless ic card |
-
1987
- 1987-03-04 JP JP62049514A patent/JPS63215230A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04192821A (en) * | 1990-11-27 | 1992-07-13 | Nec Corp | Privacy communication system by switching radio channel |
| JPH04260990A (en) * | 1991-01-25 | 1992-09-16 | Mitsubishi Electric Corp | Contactless ic card |
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