JPH01177223A - Movable radio communication equipment - Google Patents
Movable radio communication equipmentInfo
- Publication number
- JPH01177223A JPH01177223A JP63000498A JP49888A JPH01177223A JP H01177223 A JPH01177223 A JP H01177223A JP 63000498 A JP63000498 A JP 63000498A JP 49888 A JP49888 A JP 49888A JP H01177223 A JPH01177223 A JP H01177223A
- Authority
- JP
- Japan
- Prior art keywords
- channel
- base station
- electric field
- field strength
- output
- 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.)
- Pending
Links
- 238000004891 communication Methods 0.000 title claims abstract description 46
- 230000005684 electric field Effects 0.000 claims abstract description 51
- 238000005259 measurement Methods 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000001747 exhibiting effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は複数の基地局のサービスエリア間を移動する際
に、常に良好な通信を行うことが出来るようにした移動
用の無線通信装置に関するものである。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is a mobile device that can always maintain good communication when moving between service areas of multiple base stations. The present invention relates to a wireless communication device.
（従来の技術）
例えば、自動車や船舶、鉄道等のような移動体において
、手軽に情報を交換できるようにした無線通信装置は近
年広く実用に供されている。ところで、無線通信装置に
も種々のものがあるが、その中で、移動無線電話のよう
に相手を特定して、その特定の相手と基地局を介して通
信できるようにした移動無線通信装置（以下、端末装置
と称する）は端末装置が移動体の移動に伴って移動する
ことから、これをカバーするべく複数の基地局を点在さ
せ、移動体は通信を行う時点で最も強い電界強度を示す
基地局のチャネルに自己のチャネルをセットしてその基
地局と通信を行うようにしていた。しかし、移動体での
通信においては、ある基地局のサービスエリアから他の
基地局のサービスエリアへの移動と言った具合に移動体
の移動に伴って最も強い電界強度を示す基地局は時々刻
々と変化することになる。そのため、移動体の移動によ
り現在アクセス中の基地局とその後も最良の状態での通
信を維持すると言ったことは非常に困難である。(Prior Art) For example, wireless communication devices that allow information to be easily exchanged in moving bodies such as automobiles, ships, and railways have been widely put into practical use in recent years. By the way, there are various types of wireless communication devices, and among them, mobile wireless communication devices (such as mobile wireless telephones) that can specify the other party and communicate with that specific party via a base station. Since the terminal device (hereinafter referred to as a terminal device) moves with the movement of the mobile object, multiple base stations are scattered to cover this, and the mobile object receives the strongest electric field strength at the time of communication. The user set their own channel to the channel of the indicated base station and communicated with that base station. However, in mobile communication, the base station exhibiting the strongest electric field strength changes from time to time as the mobile moves, such as when moving from the service area of one base station to the service area of another base station. This will change. Therefore, it is extremely difficult to maintain communication in the best condition with the base station currently being accessed due to movement of the mobile object.
（発明が解決しようとする問題点）
このように、移動無線電話のように相手を特定して、そ
の特定の相手と基地局を介して通信できるようにした移
動無線通信においては、端末装置が移動体の移動に伴っ
て移動することから、これをカバーするべく複数の基地
局を点在させ、移動体は通信を行う時点で最も強い電界
強度を示す基地局のチャネルに自己のチャネルをセット
して以後、その基地局のサービスエリア内ではその基地
局を介して通信を行うようにしている。しかし、移動体
での通信においては、ある基地局のサービスエリアから
他の基地局のサービスエリアへの移動と言った具合に移
動体の移動に伴って最も強い電界強度を示す基地局は時
々刻々と変化することになり、基地局毎のサービスエリ
アを外れない限り、その局を介して通信を行う方式では
現在アクセス中の基地局とその後も最良の状態での通信
を維持すると言ったことは非常に困難である。(Problems to be Solved by the Invention) As described above, in mobile radio communications, such as mobile radio telephones, in which a party can be specified and communication can be made with that specific party via a base station, the terminal device is Since mobile objects move as they move, multiple base stations are scattered to cover them, and mobile objects set their own channel to the channel of the base station that shows the strongest electric field strength at the time of communication. After that, communication is performed via that base station within the service area of that base station. However, in mobile communication, the base station exhibiting the strongest electric field strength changes from time to time as the mobile moves, such as when moving from the service area of one base station to the service area of another base station. As long as you do not go out of the service area of each base station, the method of communicating via that station will maintain communication in the best condition with the base station you are currently accessing. Very difficult.
すなわち、この場合、端末装置が現在通信中の基地局の
サービスエリアの周辺側に近付くにつれＳ／Ｎが悪く−
、雑音が多くなり、現在通信中の基地局のサービスエリ
アと隣接基地局のサービスエリアとがオーバラップする
地域では廻りの地形や建物の状態等により今まで通信中
の基地局より、隣接基地局の方が電界強度が高く通信が
良好となることも多い。That is, in this case, as the terminal device approaches the periphery of the service area of the base station with which it is currently communicating, the S/N deteriorates.
In areas where there is a lot of noise and the service area of the currently communicating base station overlaps with the service area of an adjacent base station, the neighboring base station In many cases, the electric field strength is higher and communication is better.
このように通信開始時での電界強度の最も強い基地局に
アクセスするので、移動に伴い電界強度が弱くなっても
通信状態の悪いまま通信を行わざる得ない−という欠点
があった。In this way, since the base station with the strongest electric field strength at the time of communication initiation is accessed, there is a drawback that even if the electric field strength weakens as the user moves, the communication cannot be helped but continues in poor communication conditions.
そこで、この発明の目的とするところは、常に電界強度
の最も強い基地局とアクセスでき、最良の状態で通信を
行うことができるようにしたチャネル自動選択可能な移
動用の無線通信装置を提供することにある。Therefore, an object of the present invention is to provide a mobile wireless communication device capable of automatically selecting a channel, which can always access the base station with the strongest electric field strength and communicate in the best condition. There is a particular thing.
（問題点を解決するための手段）
上記目的を達成するため、本発明は次のように構成する
。すなわち、複数の基地局を点在して配置し、各基地局
は隣接する基地局と異なるチャネルが割当てられるとと
もに、移動無線通信装置はこれら各チャネル用の送受信
手段を有し各基地局のサービスエリア内ではその基地局
に割当てられたチャネルを利用して基地局と無線通信を
行うようにした無線通信システムにおいて、各基地局の
チャネル出力を順次受信して電界強度出力出力を得る電
界強度測定用受信手段と、この電界強度測定用受信手段
の測定出力と前記送受信手段の受信信号の電界強度出力
とを比較し電界強度測定用受信手段の測定出力が送受信
手段の受信信号の電界強度出力を上回ると切換出力を発
生する比較手段と、常時前記電界強度測定用受信手段の
受信チャネルを順に切換えるべく測定チャネル切換指令
を出力するとともに前記比較手段より切換出力を受ける
とその時の電界強度測定用受信手段の受信チャネルに前
記送受信手段の送受信チャネルを切換えるチャネル制御
手段とを具備して構成する。(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, a plurality of base stations are arranged in a scattered manner, and each base station is assigned a different channel from that of the adjacent base station, and the mobile radio communication device has a transmitting/receiving means for each of these channels, and the service of each base station is assigned to the mobile radio communication device. In a wireless communication system that performs wireless communication with a base station using the channel assigned to that base station within an area, field strength measurement is performed to obtain the field strength output by sequentially receiving the channel output of each base station. and compares the measured output of the receiving means for field strength measurement with the electric field strength output of the received signal of the transmitting/receiving means, and the measured output of the receiving means for measuring field strength is equal to the field strength output of the received signal of the transmitting/receiving means. a comparison means that generates a switching output when the signal exceeds the threshold; and a comparison means that always outputs a measurement channel switching command to sequentially switch the reception channels of the reception means for field strength measurement, and when receiving a switching output from the comparison means, the reception means for field strength measurement at that time. and channel control means for switching the transmission/reception channel of the transmitting/receiving means.
（作 用）
このような構成において、複数の基地局が点在配置され
ており、各基地局は隣接する基地局と異なるチャネルが
割当てられるとともに、移動無線通信装置は各基地局の
サービスエリア内ではその基地局に割当てられたチャネ
ルを利用して基地局と無線通信を行う。通信開始時にお
いてはその地点において電界強度の最も強い基地局のチ
ャネルを用いて通信を行う。そして、通信を開始すると
チャネル制御手段は電界強度測定用受信手段の受信チャ
ネルを順次切換えるように制御し、これによって、電界
強度測定用受信手段は各基地局のチャネル出力を順次受
信して電界強度測定出力を得る。この電界強度測定出力
は比較手段に与えられ、比較手段はこの電界強度測定用
受信手段の測定出力と前記送受信手段の受信信号の電界
強度出力とを比較する。そして、電界強度測定用受信手
段の測定出力が送受信手段の受信信号の電界強度出力を
上回ると切換出力を発生する。比較手段からのこの切換
出力はチャネル制御手段に送られ、チャネル制御手段は
この切換出力を受けるとその時の電界強度測定用受信手
段の受信チャネルに前記送受信手段の送受信チャネルを
切換える。これにより、送受信手段は現在層も電界強度
の強いチャネルに切換えられて通信を続けることになる
。(Function) In such a configuration, multiple base stations are scattered, each base station is assigned a different channel from the adjacent base station, and mobile radio communication equipment is located within the service area of each base station. Then, wireless communication is performed with the base station using the channel assigned to that base station. At the start of communication, communication is performed using the channel of the base station with the strongest electric field strength at that point. Then, when communication is started, the channel control means controls the reception channel of the field strength measurement reception means to be switched sequentially, so that the field strength measurement reception means sequentially receives the channel output of each base station and Obtain measurement output. This electric field strength measurement output is given to a comparison means, and the comparison means compares the measurement output of this electric field strength measurement receiving means with the electric field strength output of the received signal of the transmitting/receiving means. Then, when the measurement output of the receiving means for field strength measurement exceeds the field strength output of the received signal of the transmitting/receiving means, a switching output is generated. This switching output from the comparison means is sent to the channel control means, and upon receiving this switching output, the channel control means switches the transmitting/receiving channel of the transmitting/receiving means to the receiving channel of the receiving means for measuring electric field strength at that time. As a result, the transmitting/receiving means is switched to a channel with a strong electric field strength in the current layer and continues communication.
このように、各チャネルの電界強度を監視するための受
信手段を設けて常に各チャネルの受信電界強度を測定し
、実際に送受信に供しているチャネルの受信電界強度と
比較して受信電波の電界強度が最も強いチャネルに送受
信チャネルを切換えるようにしたものであり、常に受信
電波の電界強度が最も高いチャネルを利用して通信する
ことが出来るので、現在通信中の基地局のサービスエリ
アと隣接基地局のサービスエリアとがオーバラップする
地域等のように廻りの地形や建物の状態等により今まで
通信中の基地局より、隣接基地局の方が電界強度が高く
通信が良好となるような場合においては直ちに、その良
好な方のチャネルの基地局に切換えて通信できるように
なる。In this way, a receiving means is provided to monitor the electric field strength of each channel, and the received electric field strength of each channel is constantly measured and compared with the received electric field strength of the channel actually used for transmission and reception. This system switches the transmitting and receiving channels to the channel with the strongest field strength, and since it is possible to always communicate using the channel with the highest field strength of the received radio waves, the service area of the base station currently communicating and the adjacent base In cases such as areas where the service area of a station overlaps, the field strength of the adjacent base station is higher than that of the base station currently communicating, resulting in better communication due to the surrounding topography, building conditions, etc. , you can immediately switch to the base station with the better channel and communicate.
従って、この発明によれば、常に電界強度の最も強い基
地局とアクセスでき、最良の状態で通信を行うことがで
きるようになる。Therefore, according to the present invention, it is possible to always access the base station with the strongest electric field strength and to perform communication under the best conditions.
（実施例）
以下、本発明の一実施例について第１図乃至第３図を参
照して説明する。(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.
第１図は本装置の構成を示すブロック図であり、図中Ａ
ＮＴはアンテナ、１は送受信機である。FIG. 1 is a block diagram showing the configuration of this device.
NT is an antenna, and 1 is a transceiver.
２は送信情報や受信情報の処理を行うデータ処理部、３
は送受信チャネルの切換え制御を行うチャネル制御部、
４はチャネル制御部３からの切換え制御出力によって順
次チャネルが切換えられ、各基地局のチャネルに送り出
されている空線信号を受信してその電界強度を測定する
電界強度測定用の受信機である。５はこの受信機４の出
力する電界強度と送受信ｔｌｌによる受信された電波の
電界強度を比較する比較部であり、６は送受信機１の受
信信号を復調してデータ処理部２に与え、また、データ
処理部２からのデータを変調して送受信機１に与える変
復調器である。前記チャネル制御部３は送受信機１の受
信信号の電界強度が受信Ｒ４の受信信号の電界強度より
低い時、その受信機４の受信しているチャネルを送受信
機１が選択するよう送受信機１にチャネル選択指令を与
え、また、データ処理部２より与えられる基地局からの
受信チャネル指定データに応じて送受信機１が選択する
チャネルを指令制御する機能を有する。2 is a data processing unit that processes transmitted information and received information; 3
is a channel control unit that controls switching of transmitting and receiving channels;
Reference numeral 4 denotes a receiver for measuring electric field strength, which receives the empty line signal sent to the channel of each base station and measures the electric field strength, the channels being sequentially switched by the switching control output from the channel control unit 3. . Reference numeral 5 denotes a comparison unit that compares the electric field strength output from the receiver 4 and the electric field strength of the radio waves received by the transmitting/receiving TLL, and 6 demodulates the received signal of the transmitter/receiver 1 and supplies it to the data processing unit 2. , a modulator/demodulator that modulates data from the data processing section 2 and provides it to the transceiver 1. The channel control unit 3 causes the transceiver 1 to select the channel on which the receiver 4 is receiving when the electric field strength of the received signal of the transceiver 1 is lower than the electric field strength of the received signal of the receiver R4. It has a function of giving a channel selection command and commanding and controlling a channel to be selected by the transceiver 1 in accordance with reception channel designation data from a base station given by the data processing unit 2.
このような構成の本装置の作用を説明する。The operation of this device having such a configuration will be explained.
本装置が例えば第２図に示すような基地局ａ−ｇのサー
ビスエリアに対して実線Ｍのような移動経路を辿って移
動したとする。第３図は第２図における移動経路上のＡ
点からＢ点への移動中に端末装置が受信した各チャネル
の電波の電界強度をグラフ化したものである。この場合
、電界強度は距離に反比例するものとして省略しである
。Assume that the present device moves along a moving route shown by a solid line M, for example, with respect to the service area of base stations a to g as shown in FIG. Figure 3 shows A on the movement route in Figure 2.
This is a graph of the electric field strength of radio waves of each channel received by the terminal device while moving from point to point B. In this case, the electric field strength is omitted as it is inversely proportional to the distance.
今、端末装置は第２図の０点に位置しているものとする
。電源を立ち上げるとこの時点では電界強度の最も強い
基地局である基地局Ｑにアクセスできるようになる。こ
れは本装置の場合、受信ｎ４がチャネル制御部３の制御
のもとに各チャネルに順次切換えられながらその時々の
チャネルの空線信号を受信しており、送受信機１の受信
信号の電界強度が受信ｔｆ１４の受信信号の電界強度よ
り低いと比較部５の出力によりチャネル制御部３はその
時の受信ｔ１４の受信チャネルを選択するように送受信
Ｒ１をチャネル切換えすることによる。Assume that the terminal device is now located at point 0 in FIG. When the power is turned on, base station Q, which is the base station with the strongest electric field strength, can be accessed at this point. In the case of this device, the receiver n4 is sequentially switched to each channel under the control of the channel control unit 3 and receives the idle signal of the channel at that time, and the electric field strength of the received signal of the transceiver 1 is is lower than the electric field strength of the reception signal of reception tf14, the channel control unit 3 switches the transmission/reception R1 channel based on the output of the comparator 5 to select the reception channel of the reception t14 at that time.
一方、基地局Ｑからは隣接する６つの基地局ａ〜ｆのチ
ャネル番号（送信周波数）情報が常に送信されているの
で、その情報をデータ処理部２で処理して周辺基地局の
チャネル情報としてチャネル制御部３に送る。これによ
りチャネル制御部３は順次これら基地局ａ〜ｆのチャネ
ルを順次監視すべく、繰返して選択切換するように受信
様４のチャネルを切換える。On the other hand, since base station Q always transmits channel number (transmission frequency) information of six adjacent base stations a to f, this information is processed by data processing unit 2 and used as channel information of surrounding base stations. It is sent to the channel control section 3. As a result, the channel control unit 3 repeatedly switches the channel of the receiver 4 in order to sequentially monitor the channels of these base stations a to f.
基地局Ｑとの通信が開始されると、この通信により得ら
れる基地局０のチャネルの受信電界強度は、順次チャネ
ル切換される受信ｔ１４のその時々のチャネルにおける
電界強度とともに比較部５にて比較される。そして、送
受信ｔ１１の受信信号の電界強度が受信′ａ４の受信信
号の電界強度より低いと比較部５は出力を発生し、この
出力によりチャネル制御部３はその時の受信機４の受信
チャネルを選択するように送受信機１をチャネル切換え
する。When communication with base station Q is started, the receiving electric field strength of the channel of base station 0 obtained through this communication is compared in comparison unit 5 with the electric field strength of the channel of reception t14, which is sequentially switched. be done. Then, when the electric field strength of the received signal of transmission/reception t11 is lower than the electric field strength of the received signal of reception 'a4, the comparator 5 generates an output, and this output causes the channel control unit 3 to select the reception channel of the receiver 4 at that time. Change the channel of the transceiver 1 so that
この結果、Ｂ点に向けて移動するにつれ、基地局Ｑから
の電界強度は弱くなり、次第に基地局ｄの電界強度が強
（なるので、Ｄ点を通過した時点あたりで比較部５に入
力され／る電界強度は送受信機１から入力βより受信機
４から得られる基地局ｄからの入力αの方が強くなる。As a result, as you move towards point B, the electric field strength from base station Q becomes weaker, and the electric field strength of base station d gradually becomes stronger (so that the electric field strength is input to comparison unit 5 around the time when you pass point D). The field strength of the input α from the base station d obtained from the receiver 4 is stronger than that of the input β from the transceiver 1.
比較部５はβ〈αの情報をチャネル制御部３に与えるの
で、チャネル制御部３はこの時点でチャネル制御部３が
選択している受信（１４のチャネルと同一チャネルを選
択させるように送受信機１のチャネルを切換える。Since the comparator 5 gives the information of β<α to the channel controller 3, the channel controller 3 changes the transmitter/receiver so that it selects the same channel as the reception channel (14) selected by the channel controller 3 at this point. Switch channel 1.
このように常に各チャネルの送信電波の電界強度を監視
して電界強度の最も強いチャネルを調べ、そのチャネル
に送受信機のチャネルを切換えるようにしたものである
から、送受信機１の受信電波は移動体のＡ点からＢ点へ
の移動とともに第３図にＳで示すように電界強度の最も
強い基地局のチャネルを利用するように選択切換えされ
るので、常に最良の状態で基地局と通信することが可能
になる。In this way, the field strength of the transmitted radio waves of each channel is constantly monitored, the channel with the strongest field strength is determined, and the channel of the transceiver is switched to that channel, so the radio waves received by the transceiver 1 are moved. As the body moves from point A to point B, selection is switched to use the channel of the base station with the strongest electric field strength, as shown by S in Figure 3, so communication with the base station is always in the best condition. becomes possible.
以上、詳述したように本装置は、常に電界強度の最も強
い基地局とアクセスでき、最良の状態で通信を行うこと
ができるようになるので、端末装置の受信状態は、通信
周波数の異なった各基地局のサービスエリア間を移動し
ても常に良好な受信状態を保つことが出来るようになり
、特にサービスエリアの狭いシステムや移動体のスピー
ドが速い割にサービスエリアが狭いといったシステムで
は通信品位を従来に比べ飛躍的に改善できるようになる
。As detailed above, this device can always access the base station with the strongest electric field strength and communicate in the best condition, so the receiving condition of the terminal device will vary depending on the communication frequency. It is now possible to always maintain good reception even when moving between the service areas of each base station, and communication quality is particularly high in systems with narrow service areas or systems where the service area is narrow considering the speed of the mobile device. can be dramatically improved compared to conventional methods.
尚、本発明は上記し且つ図面に示す実施例に限定するこ
となくその要旨を変更しない範囲内で適宜変形して実流
し得ることは勿論である。It goes without saying that the present invention is not limited to the embodiments described above and shown in the drawings, but can be suitably modified and put into practice without changing the gist thereof.
以上、詳述したようにこの発明によれば、常に電界強度
の最も強い基地局とアクセスでき、最良の状態で通信で
きるようにした移動無線通信装置を提供出来る。As described in detail above, according to the present invention, it is possible to provide a mobile radio communication device that can always access the base station with the strongest electric field strength and communicate in the best condition.
第１図は本発明の一実施例を示すブロック図、第２図は
各基地局とそのサービスエリア及び移動体の通過経路の
例を示す図、第３図は第２図における移動経路上のＡ点
からＢ点への移動中に端末装置が受信する各チャネルの
電波の電界強度を示季
す図でる。
１・・・送受信機、２・・・データ処理部、３・・・チ
ャネル制御部、４・・・電界強度測定用受信機、５・・
・比較部、６・・・変復調器、ＡＮＴ・・・アンテナ。FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing each base station, its service area, and an example of a moving route of a mobile object, and FIG. 3 is a diagram showing an example of the moving route in FIG. 2. It is a diagram showing the electric field strength of radio waves of each channel received by the terminal device while moving from point A to point B. DESCRIPTION OF SYMBOLS 1... Transmitter/receiver, 2... Data processing section, 3... Channel control section, 4... Receiver for electric field strength measurement, 5...
- Comparison section, 6...modulator/demodulator, ANT...antenna.
Claims (1)
基地局と異なるチャネルが割当てられるとともに、移動
無線通信装置はこれら各チャネル用の送受信手段を有し
各基地局のサービスエリア内ではその基地局に割当てら
れたチャネルを利用して基地局と無線通信を行うように
した無線通信システムにおいて、各基地局のチャネル出
力を順次受信して電界強度測定出力を得る電界強度測定
用受信手段と、この電界強度測定用受信手段の測定出力
と前記送受信手段の受信信号の電界強度出力とを比較し
電界強度測定用受信手段の測定出力が送受信手段の受信
信号の電界強度出力を上回ると切換出力を発生する比較
手段と、常時前記電界強度測定用受信手段の受信チャネ
ルを順に切換えるべく測定チャネル切換指令を出力する
とともに前記比較手段より切換出力を受けるとその時の
電界強度測定用受信手段の受信チャネルに前記送受信手
段の送受信チャネルを切換えるチャネル制御手段とを具
備してなる移動無線通信装置。A plurality of base stations are arranged in a scattered manner, and each base station is assigned a different channel from the adjacent base station, and the mobile radio communication device has a transmitting/receiving means for each of these channels, and within the service area of each base station. In a wireless communication system that performs wireless communication with a base station using a channel assigned to that base station, there is a receiver for field strength measurement that sequentially receives the channel output of each base station and obtains a field strength measurement output. comparing the measured output of the receiving means for field strength measurement with the field strength output of the received signal of the transmitting/receiving means, and if the measured output of the receiving means for field strength measurement exceeds the field strength output of the received signal of the transmitting/receiving means; Comparing means for generating a switching output, and always outputting a measurement channel switching command to sequentially switch the reception channels of the receiving means for measuring electric field strength, and when receiving a switching output from the comparing means, the receiving means for measuring electric field strength at that time. A mobile radio communication device comprising channel control means for switching the transmission and reception channel of the transmission and reception means to a reception channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63000498A JPH01177223A (en) | 1988-01-05 | 1988-01-05 | Movable radio communication equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63000498A JPH01177223A (en) | 1988-01-05 | 1988-01-05 | Movable radio communication equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01177223A true JPH01177223A (en) | 1989-07-13 |
Family
ID=11475422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63000498A Pending JPH01177223A (en) | 1988-01-05 | 1988-01-05 | Movable radio communication equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01177223A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100330905A1 (en) * | 2009-06-30 | 2010-12-30 | Casio Computer Co., Ltd. | Wireless communication apparatus and wireless communication method for detecting electric field intensity of wireless channel |
-
1988
- 1988-01-05 JP JP63000498A patent/JPH01177223A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100330905A1 (en) * | 2009-06-30 | 2010-12-30 | Casio Computer Co., Ltd. | Wireless communication apparatus and wireless communication method for detecting electric field intensity of wireless channel |
| US8818286B2 (en) * | 2009-06-30 | 2014-08-26 | Casio Computer Co., Ltd. | Wireless communication apparatus and wireless communication method for detecting electric field intensity of wireless channel |
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