JPS59200537A - Mobile communication equipment - Google Patents

Mobile communication equipment

Info

Publication number
JPS59200537A
JPS59200537A JP58072922A JP7292283A JPS59200537A JP S59200537 A JPS59200537 A JP S59200537A JP 58072922 A JP58072922 A JP 58072922A JP 7292283 A JP7292283 A JP 7292283A JP S59200537 A JPS59200537 A JP S59200537A
Authority
JP
Japan
Prior art keywords
clock
microprocessor
frequency
signal
state
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
Application number
JP58072922A
Other languages
Japanese (ja)
Inventor
Toshihiko Yumoto
湯本　敏彦
Katsumi Kobayashi
勝美 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP58072922A priority Critical patent/JPS59200537A/en
Publication of JPS59200537A publication Critical patent/JPS59200537A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • 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

Abstract

PURPOSE:To reduce the power consumption of a control part by supplying a high-frequency or low-frequency clock to a micro-processor according to whether the amount of processing carried out by the microprocessor within a specific time is large or small. CONSTITUTION:The microprocessor muPC7 of the control part for mobile communication is supplied with a clock signal 17 obtained by dividing the frequency of a clock from a clock generating circuit 5 by a variable frequency dividing circuit 16, and the frequency division rate of the circuit 16 is set by a control signal 18 outputted from an input and output circuit 11. The control part 15 supplies the low-frequency clock fb to the muPC7 in a stand-by state because the number of processes of the muPC7 is small. The muPC7 enters a connection control state at the time 19 when a mobile communication subscriber detects the off- hook state of a telephone set terminal 3, and the amount of processing is large, so a clock fa is supplied to the muPC7 as a substitute. The amount of processing becomes small at the point 20 when telephone service is started, and the clock fb is supplied; and the control state is entered at the point 2 of on-hook signal detection, to supply the clock fa, and the clock fb is supplied at the point 22 of the completion of on-hook operation.

Description

【発明の詳細な説明】 本発明は制御部にマイクロプロセッサが用いられ１通話
路接続制御もしくは着呼信号と発呼信号および終話信号
の監視制御が上記マイクロプロセッサに供給されるクロ
ック信号に同期して実行される移動通信機に関するもの
である。以下に従来例について説明する。DETAILED DESCRIPTION OF THE INVENTION The present invention uses a microprocessor in the control unit, and controls connection of one call path or monitors control of an incoming call signal, a calling signal, and a call termination signal in synchronization with a clock signal supplied to the microprocessor. The present invention relates to a mobile communication device that is executed as a mobile communication device. A conventional example will be explained below.

従来の自動車電話移動通信機および携帯電′ｔｉ移動通
信機に代表される移動通信機（以下これらを移動通信機
という）の一般的構成を第１図に示す。FIG. 1 shows the general configuration of a mobile communication device (hereinafter referred to as a mobile communication device) typified by a conventional car phone mobile communication device and a portable cell phone mobile communication device.

従来の移動通信機は制御部ｌと無線部λと電話機端末３
から構成されている。制御部ｌは移動通信機と基地局弘
との間の通話路接続の制御を行う。A conventional mobile communication device has a control unit l, a radio unit λ, and a telephone terminal 3.
It consists of The control unit 1 controls the communication path connection between the mobile communication device and the base station Hiroshi.

無線部コは基地局≠との間で無線チャネルを通して信号
の送受信を行う。The radio unit sends and receives signals to and from the base station via a radio channel.

制御部ｌはクロック発生回路ｊ％クロ々り信号６、マイ
クロプロセッサ７、プログラムメモリｒ。The control unit l includes a clock generation circuit j, a % clock signal 6, a microprocessor 7, and a program memory r.

データメモ入出力人出方回路１０．パスライン／／から
構成されている。以Ｆに移動通信機の動作を状態遷移図
によって説明する。移動通信機の状態は動作の種類によ
って５第２図に示すように待受状態１２と接続制御状態
１３と通話中状態ｌ≠の３種類の状態に大別される。Data memo input/output circuit 10. It consists of a pass line //. Below, the operation of the mobile communication device will be explained using a state transition diagram. The state of a mobile communication device is roughly divided into three states depending on the type of operation: a standby state 12, a connection control state 13, and a busy state l≠, as shown in FIG.

移動通信機は通常の場合、電話機端末３におけるオフフ
ック信号もしくは基地局≠かも移動通信機すなわち自局
への着呼信号を検出するまでの期間は待受状態１２にあ
り、上記オフフック信号もしくは着呼信号の有無を監視
する。待受状態１２においてオフフック信号もしくは着
呼信号を検知した場合、移動通信機は基地局ｊとの間の
通話路を設定するために接続制御状ｄ　／　３に移行し
、基地局≠との間で通話路設定に必要なデータ信号の送
受信を行い、通話路を設定する。前記通話路の設定が完
了した後は通話中状ｅ４／≠に移行する。In normal cases, the mobile communication device is in the standby state 12 until it detects an off-hook signal at the telephone terminal 3 or an incoming call signal to the base station. Monitor the presence or absence of a signal. When an off-hook signal or an incoming call signal is detected in standby state 12, the mobile communication device shifts to connection control state d/3 in order to set up a communication path with base station j, and establishes a connection between base station ≠ The communication route is set by transmitting and receiving the data signals necessary for setting up the communication route. After the setting of the communication path is completed, the state shifts to a communication busy state e4/≠.

電話機端末３におけるオンフック信号もしくは基地局≠
からの終話信号もしくは通話路切替信号を検出するまで
の期間は前記通話中状態にあり、前記オンフック信号も
しくは終話信号もしくは通話路切替信号の有無を監視す
る。On-hook signal or base station at telephone terminal 3≠
The telephone is in the busy state until it detects a call-end signal or a call-path switching signal, and monitors the presence or absence of the on-hook signal, call-off signal, or call-path switching signal.

前記オンフック信号もしくは終話信号を検知した場合、
接続制御状態／　３に移行し、基地局≠との間で終話に
必要なデータ信号の送受信を行い、終話動作を完了した
後、待受状態１２に移行する。When the on-hook signal or end-of-call signal is detected,
Transitioning to connection control state /3, transmitting and receiving data signals necessary for terminating a call with the base station≠, and completing the call terminating operation, transitioning to standby state 12.

一方、前記通話中状態において通話路切替信号を検出し
た場合、接続制御状態１３に移行し、通話路設定を行う
。前記通話路設定動作が完了後、再び前記通話中状態に
移行する。On the other hand, if a call path switching signal is detected in the busy state, the state shifts to connection control state 13 and a call path is set. After the call path setting operation is completed, the state returns to the busy state.

また、前記通話中状態において電波か中断し、通話が不
可能になった場合は待受状態１２に移行する。Further, if the radio waves are interrupted during the call-in-progress state and the call becomes impossible, the state shifts to the standby state 12.

前記待受状態１２と接続制御状態１３と通話中状態ｌ≠
の３種類の状態のうち、接続制御状態においては基地局
≠との間で１デ一タ信号の送信および受信を同時に行う
必要があるため、前記マイクロプロセッサ７には処理の
高速性すなわち高周波数のクロックの供給が要求される
。一方、待受状態および通話中状態においてはデータ信
号の受信のみが必要であり、接続制御状態に比べてマイ
クロプロセッサ７には処理の島速性は要求されない、す
なわち低周波数のクロックの供給によって処理が可能で
ある。The standby state 12, the connection control state 13, and the busy state l≠
Among the three types of states, in the connection control state it is necessary to simultaneously transmit and receive one data signal from the base station≠, so the microprocessor 7 has high processing speed, that is, high frequency clock supply is required. On the other hand, in the standby state and the busy state, only data signal reception is required, and compared to the connection control state, the microprocessor 7 is not required to perform processing at high speed. is possible.

従来の８！ｔｊＪ通信機においては、マイクロプロセッ
サ７に供給するクロック信号乙の周波数は最も処理の高
速性が要求される前記接続制御状態における処理動作条
件を満たすべく高周波数に設定されており、しかも移動
通信機の前記全ての状態に対して常に同一周波数に設定
されていた。Conventional 8! In the tjj communication device, the frequency of the clock signal B supplied to the microprocessor 7 is set to a high frequency in order to satisfy the processing operation conditions in the connection control state where the highest processing speed is required. The same frequency was always set for all the above states.

従って、前記マイクロプロセッサが０Ｍ０Ｓプロセスで
製造されているような場合、マイクロプロセッサの消費
電力はクロック周波数に比例する性質を有するため、低
周波数のクロックの供給によって十分に処理が用能な前
記待受状態１２および通話中状態ｌ≠においては無駄な
電力が消費され、その結果、携帯電話移動通信機のよう
に電池を電源としている移動通信機の場合、使用可能な
時間が減少するという欠点があった。Therefore, when the microprocessor is manufactured using the 0MOS process, the power consumption of the microprocessor is proportional to the clock frequency. In state 12 and in the busy state l≠, power is wasted, and as a result, in the case of a mobile communication device that uses a battery as a power source, such as a mobile phone mobile communication device, there is a drawback that the usable time is reduced. Ta.

本発明はこれらの欠点を除去するためにマイクロプロセ
ッサで一定時間内に実行されるプログラム処理量が多い
状態においては前記マイクロプロセッサに高周波数のク
ロックを供給し、プロゲラ−６− ム処理蓋が少ない状態においては低周波数のクロックを
供給するような構成としたことを特徴とし、その目的は
プログラム処理量が少ない状態における制御部の消費電
力を低減することにある。以下に本発明の実施例につい
て説明する。In order to eliminate these drawbacks, the present invention supplies a high frequency clock to the microprocessor when the amount of program processing executed by the microprocessor within a certain period of time is large, thereby reducing program processing time. It is characterized by a configuration in which a low-frequency clock is supplied during the state, and its purpose is to reduce the power consumption of the control unit when the amount of program processing is small. Examples of the present invention will be described below.

第３図に本発明の実施例である制御部ｉｓを用いた移動
通信機の構成を示す。マイクロプロセッサ７へはクロッ
ク信号６を分周回路１６によって分周したクロック信号
１７が供給される。可変分周回１１／７の分周比はマイ
クロプロセッサ７によって入出力回路１１から出力され
る制御信号ｌざによって設定される。FIG. 3 shows the configuration of a mobile communication device using a control unit is, which is an embodiment of the present invention. A clock signal 17 obtained by dividing the clock signal 6 by a frequency dividing circuit 16 is supplied to the microprocessor 7 . The frequency division ratio of the variable frequency divider 11/7 is set by the microprocessor 7 using a control signal lZ output from the input/output circuit 11.

クロック周波数をλ段階に切替える場合の様子を第参図
に示す。横軸は時刻であり、縦軸はクロック周波数であ
る。ｌりはオフフックあるいは着呼信号？検出した時点
、２０は通話路接続が完了して通話が開始された時点、
２１は通話が終了した時点、２２は終話動作が終了した
時点である。The situation when switching the clock frequency to λ stages is shown in Figure 3. The horizontal axis is time, and the vertical axis is clock frequency. Is it off-hook or an incoming call signal? At the time of detection, 20 is the time when the call path connection is completed and the call is started;
21 is the time point when the call ends, and 22 is the time point when the call end operation is ended.

クロック信号の高い方の周波数をｆａ　、　　低い方の
周波数をｆｂとする。第２図で説明したように、−６− 加入者がオフフックするθ・自局への着呼信号を愛情す
るまでは、制御部は待ち受は状態にあり、マイクロプロ
セッサでは処理量が少ないためクロック周波数を　ｆｂ
とする。オフフックを検出すれば、発呼の接続制御が行
われる。したがってマイクロプロセッサは接続制御状態
に移行する。ここでは処理値が多いため、クロック周波
数をｆａとする。Let the higher frequency of the clock signal be fa, and the lower frequency be fb. As explained in Figure 2, -6- Until the subscriber goes off-hook and receives an incoming call signal to his own station, the control unit is in the standby state, and the microprocessor has a small amount of processing. Set the clock frequency to fb
shall be. If off-hook is detected, call connection control is performed. The microprocessor therefore transitions to the connection control state. Since there are many processing values here, the clock frequency is set to fa.

接続制御が終了し、通話が開始されると通話中状態とな
り、処理量が少ないためクロック周波数をｆｂとする。When the connection control is completed and the call is started, the call is in a busy state, and the clock frequency is set to fb because the amount of processing is small.

オンフックあるいは終結信号を検出すると接続制御状態
に移行し終話動作を行うためにクロック周波数をｆａと
する。終話動作が完了すると待受状態に移行するためク
ロック周波数をｆｂとする。When an on-hook or termination signal is detected, the connection control state is entered and the clock frequency is set to fa in order to perform a call termination operation. When the call termination operation is completed, the clock frequency is set to fb in order to shift to the standby state.

クロック周波数の切替えは前記した如くマイクロプロセ
ッサによって可変分周回路の分周比を変更することで実
現される。従って第５図に示すように、状態の変化を検
出した後、クロック周波数が切替わるまでにクロックに
同期したプログラムの実行による時間遅れが生じること
になる。第５図においてＴａはクロック周波数ｆａから
ｆｂに切替わる場合の前記時間遅れであり、Ｐｂはクロ
ック周波数ｆｂからｆａに切替わる場合の時間遅れであ
る。クロック周波数の切替を支障なく行うためには時間
遅れｌ’ｂが一定の許容時間内に収まるように分周比ｆ
ｂ／ｆａを制限する心安がある。しかし、通常の移動通
信機の場合、状態の変化に許容される時間が数ｍｓ程度
に対し、マイクロプロセッサのクロック周期が数μＳ以
下であり、実用上は前記時間遅れは問題とならない。As described above, the switching of the clock frequency is realized by changing the frequency division ratio of the variable frequency divider circuit using the microprocessor. Therefore, as shown in FIG. 5, after a change in state is detected, there is a time delay due to execution of a program synchronized with the clock until the clock frequency is switched. In FIG. 5, Ta is the time delay when switching from clock frequency fa to fb, and Pb is the time delay when switching from clock frequency fb to fa. In order to switch the clock frequency without any problems, the frequency division ratio f must be set so that the time delay l'b falls within a certain allowable time.
There is peace of mind in limiting b/fa. However, in the case of a normal mobile communication device, the time allowed for a state change is about several milliseconds, whereas the clock cycle of a microprocessor is several microseconds or less, so the above-mentioned time delay does not pose a problem in practice.

本発明の効果を具体的に示すために、クロック周波数を
ｆａに固定した場合にマイクロプロセッサで消費される
電力をＰとし、クロック周波数を／ 切替える場合のクロック周波数ｆａが供給される時間率
をａ、クロック周波数ｆｂが供給される時間率をｂとす
ると、このときの消費電力Ｐｓは０ＭＯ８のマイクロプ
ロセッサの場合Ｐｓ＝（Ｐ・ａ＋Ｐ−ｂ４１ｙ’ｆａ）
となる。例えばｆｂ／ｆａ＝−ｆ、ａ＝−１ｂ−−とし
た１０　　　　　　　　１０ 場合Ｐｓ−，ｏ・Ｐとなり、マイクロプロセッサの消費
電力は従来の方式に比べ約半分に低減できる。To specifically demonstrate the effects of the present invention, let P be the power consumed by the microprocessor when the clock frequency is fixed to fa, and let a be the time rate at which the clock frequency fa is supplied when the clock frequency is switched. , if the time rate at which the clock frequency fb is supplied is b, the power consumption Ps at this time is Ps=(P・a+P−b41y'fa) for a 0MO8 microprocessor.
becomes. For example, in the case of 10 10 where fb/fa=-f and a=-1b--, Ps-, o.P, and the power consumption of the microprocessor can be reduced to about half compared to the conventional system.

以上説明したように本発明によればマイクロプロセッサ
におけるプログラム実行処理量の少ない待受状態におい
てはマイクロプロセッサへの供給クロック周波数を低（
するため、０Ｍ０Ｓプロセスのように消費電力が供給ク
ロック周波数に比例して増大するようなプロセスで製造
されたマイクロプロセッサが制御部に設置され、且つ電
源の投入されている時間の大部分が待受状態であるよう
な移動通信機について消費電力を大幅に低減できる利点
がある。As explained above, according to the present invention, the clock frequency supplied to the microprocessor is reduced (
Therefore, a microprocessor manufactured using a process such as the 0M0S process in which power consumption increases in proportion to the supplied clock frequency is installed in the control unit, and most of the time when the power is on is in standby mode. This has the advantage that power consumption can be significantly reduced for mobile communication devices such as those in

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の移動通信機の構成、第２図は移動通信機
の状態遷移図、第３図は本発明の実施例である移動通信
機、第≠図および第５図は状態とクロック周波数の関係
を示した図である。 ｌ・・・制御部、コ・・・無線部、３・・・電話機端末
、≠・・・基地局、！・・・クロック発生回路、ｔ・・
・クロック信号、７・・・マイクロプロセッサ、ざ・・
・プログラムメモリ、り・・・データメモリ、１０・・
・入出力回路、−９− ｉｉ・・・パスライン、１２・・・待受状態、１３・・
・接続制御状態、ｌ弘・・・通話中状態、／、ｆ・・・
制御部、ｔＡ・・・分周回路％１７・・・クロック信号
、Ｉｆ・・・制＠僅号、ｌり・・・オフフックまたは着
呼信号検出時点、２０・・・接続制御完了時点、２１・
・・通話終了時点、２２・・・終話動作完了時点。 指定代理人 −ＩＯ− ｇｉＪｌ　　図 腑３図Fig. 1 shows the configuration of a conventional mobile communication device, Fig. 2 shows a state transition diagram of the mobile communication device, Fig. 3 shows a mobile communication device which is an embodiment of the present invention, and Figs. FIG. 3 is a diagram showing the relationship between frequencies. l...Control unit, K...Radio unit, 3...Telephone terminal, ≠...Base station,! ...Clock generation circuit, t...
・Clock signal, 7... microprocessor, za...
・Program memory, data memory, 10...
・Input/output circuit, -9- ii...Pass line, 12...Standby state, 13...
・Connection control status, lhiro...talking status, /, f...
Control unit, tA... Frequency divider circuit %17... Clock signal, If... Control @ small number, lli... Time of off-hook or incoming call signal detection, 20... Time of completion of connection control, 21・
. . . At the end of the call, 22 . . . At the end of the call end operation. Designated Agent -IO- giJl Diagram 3

Claims (1)

【特許請求の範囲】[Claims] 制御部がマイクロプロセッサと、マイクロプロセッサに
クロック信号を供給する回路と、マイクロプロセッサの
プログラムを蓄積するメモリと、入出力回路とを含み、
通話路接続制御もしくは着呼信号と発呼信号および終話
信号の監視制御が上記クロック信号に同期した上記マイ
クロプロセッサのプログラムによって実行される移動通
信機において、プログラムの実行処理量が多い上記通話
路接続状態においては高周波数のクロック信号をマイク
ロプロセッサに供給し、プログラムの実行処理量が少な
い上記監視制御状態においては低周波数のクロック信号
をマイクロプロセッサに供給するように構成された制御
部を具備することを特徴とする移動通信機。The control unit includes a microprocessor, a circuit that supplies a clock signal to the microprocessor, a memory that stores a program for the microprocessor, and an input/output circuit,
In a mobile communication device in which call path connection control or monitoring control of an incoming call signal, a calling signal, and a call termination signal is executed by a program of the microprocessor synchronized with the clock signal, the above call path has a large program execution processing amount. The control section is configured to supply a high frequency clock signal to the microprocessor in a connected state, and to supply a low frequency clock signal to the microprocessor in the supervisory control state where the amount of program execution is small. A mobile communication device characterized by:
JP58072922A 1983-04-27 1983-04-27 Mobile communication equipment Pending JPS59200537A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58072922A JPS59200537A (en) 1983-04-27 1983-04-27 Mobile communication equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58072922A JPS59200537A (en) 1983-04-27 1983-04-27 Mobile communication equipment

Publications (1)

Publication Number Publication Date
JPS59200537A true JPS59200537A (en) 1984-11-13

Family

ID=13503324

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58072922A Pending JPS59200537A (en) 1983-04-27 1983-04-27 Mobile communication equipment

Country Status (1)

Country Link
JP (1) JPS59200537A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315260A2 (en) * 1987-11-02 1989-05-10 Koninklijke Philips Electronics N.V. Cellular telephone apparatus
EP0343528A2 (en) * 1988-05-21 1989-11-29 Fujitsu Limited Mobile telephone terminal
EP0351230A2 (en) * 1988-07-15 1990-01-17 Nec Corporation Radio communication apparatus having an improved signal to noise ratio
JPH0323725A (en) * 1989-06-20 1991-01-31 Matsushita Electric Ind Co Ltd Mobile radio communication equipment
FR2659812A1 (en) * 1990-03-16 1991-09-20 Matra Communication TIME MULTIPLEXING RADIO COMMUNICATION DEVICE.
EP0499440A2 (en) * 1991-02-12 1992-08-19 Nokia Mobile Phones Ltd. A circuit arrangement for a mobile telephone
WO2000031887A1 (en) * 1998-11-19 2000-06-02 Mitsubishi Denki Kabushiki Kaisha Mobile communication terminal

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315260A2 (en) * 1987-11-02 1989-05-10 Koninklijke Philips Electronics N.V. Cellular telephone apparatus
EP0343528A2 (en) * 1988-05-21 1989-11-29 Fujitsu Limited Mobile telephone terminal
EP0351230A2 (en) * 1988-07-15 1990-01-17 Nec Corporation Radio communication apparatus having an improved signal to noise ratio
JPH0226131A (en) * 1988-07-15 1990-01-29 Nec Corp Small-sized digital radio receiver
JPH0744477B2 (en) * 1988-07-15 1995-05-15 日本電気株式会社 Small digital radio receiver
JPH0323725A (en) * 1989-06-20 1991-01-31 Matsushita Electric Ind Co Ltd Mobile radio communication equipment
FR2659812A1 (en) * 1990-03-16 1991-09-20 Matra Communication TIME MULTIPLEXING RADIO COMMUNICATION DEVICE.
EP0499440A2 (en) * 1991-02-12 1992-08-19 Nokia Mobile Phones Ltd. A circuit arrangement for a mobile telephone
WO2000031887A1 (en) * 1998-11-19 2000-06-02 Mitsubishi Denki Kabushiki Kaisha Mobile communication terminal
US6148215A (en) * 1998-11-19 2000-11-14 Mitsubishi Denki Kabushiki Kaisha Mobile communication terminal

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