JPH07177081A - Moving body communication system and its terminal equipment - Google Patents

Moving body communication system and its terminal equipment

Info

Publication number
JPH07177081A
JPH07177081A JP5318206A JP31820693A JPH07177081A JP H07177081 A JPH07177081 A JP H07177081A JP 5318206 A JP5318206 A JP 5318206A JP 31820693 A JP31820693 A JP 31820693A JP H07177081 A JPH07177081 A JP H07177081A
Authority
JP
Japan
Prior art keywords
data
base station
circuit
terminal device
control circuit
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.)
Granted
Application number
JP5318206A
Other languages
Japanese (ja)
Other versions
JP2616673B2 (en
Inventor
Tsukasa Yamaguchi
司 山口
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP5318206A priority Critical patent/JP2616673B2/en
Publication of JPH07177081A publication Critical patent/JPH07177081A/en
Application granted granted Critical
Publication of JP2616673B2 publication Critical patent/JP2616673B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Monitoring And Testing Of Transmission In General (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

PURPOSE:To accurately perform the fault processing by depressing a service abnormality switch to temporarily hold the connection control data conducted just before and referring to this data. CONSTITUTION:If service abnormality is discriminated during communication and a service abnormality switch 4 is depressed, a control circuit 8 temporarily stores call processing data related data related to the abnormal communication call in a memory circuit 6. When normal communication is possible, a fault information transmission circuit 7 automatically transmits a signal to a data base device 19 of a centralized operation maintenance center 20 and reads out related data from the circuit and transmits it through a radio transmitter-receiver 9. This data are received by a radio transmitter-receiver 12 in a base station 2 and is transmitted from a radio base station control circuit 13 to a data reception circuit 14 of an exchange 3 for moving body communication. A central processing unit 16 reads related data from the circuit 14 and transmits it from a data transmission circuit 15 to a data reception circuit 17. An index number 18 is added to this data, and it is recorded in the device 19, and fault trace analysis, statistical processing of fault contents, etc., are performed based on this data.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、移動体通信システムに
おける通信サービス異常呼の障害分析に利用する。本発
明は、異常呼発生時に正確な情報に基づいて障害処理を
行うことができる移動体通信システムに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for failure analysis of abnormal communication service calls in a mobile communication system. The present invention relates to a mobile communication system capable of performing failure processing based on accurate information when an abnormal call occurs.

【0002】[0002]

【従来の技術】従来の方式では、加入者からの通信サー
ビス異常に関する苦情は移動体通信システムオペレータ
に電話により口答で通知されていたため、その断片的か
つ不十分な情報を基に移動体通信システムの試験装置か
ら該当する加入者端末への発信および着信試験を行い、
正常性の確認や障害の切り分けを行っていた。
2. Description of the Related Art In the conventional system, since a complaint from a subscriber regarding a communication service abnormality has been verbally notified to a mobile communication system operator by telephone, the mobile communication system is based on the fragmented and insufficient information. Performs outgoing and incoming call tests from the test equipment of to the applicable subscriber terminal,
The normality was confirmed and the failure was isolated.

【0003】[0003]

【発明が解決しようとする課題】このような従来の方式
では、異常に関する苦情が技術の専門家でない加入者か
らの限られた断片的な障害情報であるために、障害分析
を行うのに必要とされる重要な情報を入手するのが困難
であった。
In such a conventional method, it is necessary to perform the failure analysis because the complaint about the abnormality is the limited fragmented failure information from the subscriber who is not a technical expert. It was difficult to obtain important information that was said to be.

【0004】本発明はこのような問題を解決するもの
で、異常通信呼に関する呼処理関連データを集中運用保
守センタに記録しておき、加入者から異常時のサービス
要求を受けたときに、その記録内容を参照して正確な情
報により障害処理を行うことができる移動体通信システ
ムを提供することを目的とする。
The present invention solves such a problem. Call processing related data relating to an abnormal communication call is recorded in a centralized operation and maintenance center, and when a service request at the time of an abnormality is received from a subscriber, the data is stored. It is an object of the present invention to provide a mobile communication system capable of performing failure processing by referring to recorded contents and using accurate information.

【0005】交換システム内に障害情報を保持し、後か
らそれを読出して障害分析を行うとの思想は、例えば、
特開昭61−194961号公報、特開平2−1436
58号公報などにあり、その分析を行う装置としては特
開昭61−145667号公報にあるが、いずれも移動
通信の端末装置に障害データを保持しそれを読出して分
析するとの思想のものではない。
The idea of holding fault information in the switching system and reading it out later for fault analysis is, for example,
JP-A-61-194961 and JP-A-2-1436
No. 58, etc., and an apparatus for performing the analysis is disclosed in Japanese Patent Application Laid-Open No. 61-145667, but none of them is based on the idea of holding fault data in a mobile communication terminal device and reading the fault data for analysis. Absent.

【0006】[0006]

【課題を解決するための手段】本発明の第一は、通信を
行う毎に基地局との間で接続応答プロトコルを実行し無
線回線を設定する制御回路と、その基地局との間に双方
向の通信を行う無線送受信機とを備えた端末装置におい
て、操作により押下されるサービス異常スイッチと、デ
ータセーブ・メモリ回路とを備え、前記制御回路は、そ
のサービス異常スイッチが押下されたときにはその直前
に実行された接続制御に係るデータを前記データセーブ
・メモリ回路に一時保持させる制御手段を備えたことを
特徴とする。
The first aspect of the present invention is to provide a control circuit for executing a connection response protocol with a base station and setting up a wireless line each time communication is performed, and a control circuit between the control circuit and the base station. In a terminal device including a wireless transceiver that performs bidirectional communication, a service abnormality switch that is pressed by an operation and a data save memory circuit are provided, and the control circuit is configured to operate when the service abnormality switch is pressed. The data saving memory circuit is provided with control means for temporarily holding the data relating to the connection control executed immediately before.

【0007】前記制御回路には、基地局から到来する制
御信号にしたがって前記データセーブ・メモリ回路に保
持されたデータを前記無線送受信機からその基地局に送
信する制御手段と、前記異常スイッチが押下された後に
基地局に対して自動的に接続を実行し異常スイッチが押
下された旨の情報をその基地局に伝達する手段とを備え
ることが望ましい。
In the control circuit, control means for transmitting the data held in the data save memory circuit from the wireless transceiver to the base station according to a control signal coming from the base station, and the abnormal switch is depressed. It is desirable to provide a means for automatically connecting to the base station after the operation and transmitting information indicating that the abnormal switch has been pressed to the base station.

【0008】本発明の第二は、前記端末装置と通信を行
う基地局とを備え、その基地局は移動体通信用交換機を
介して集中運用保守センタに接続され、その集中運用保
守センタには障害データを保持するためのデータベース
装置を備え、前記基地局には、無線回線を介して前記端
末装置の前記データセーブ・メモリ回路に保持されたデ
ータを読出してそのデータベースに転送させる無線基地
局制御回路を備えたことを特徴とする。
A second aspect of the present invention is provided with a base station that communicates with the terminal device, the base station being connected to a centralized operation and maintenance center via a mobile communication exchange, and the centralized operation and maintenance center being connected to the centralized operation and maintenance center. Radio base station control including a database device for holding fault data, wherein the base station reads data held in the data save memory circuit of the terminal device via a radio line and transfers the data to the database It is characterized by having a circuit.

【0009】前記接続制御に係るデータは、発進番号、
着信番号、時刻情報、サービス種別、異常発生イベント
種別、内部エラー種別、無線チャネル番号、使用無線基
地局番号、および使用回線番号であることが望ましい。
The data relating to the connection control includes a start number,
It is desirable that the incoming call number, time information, service type, abnormality occurrence event type, internal error type, wireless channel number, used wireless base station number, and used line number.

【0010】[0010]

【作用】サービス異常があり加入者がサービス異常スイ
ッチを押下すると、制御回路がその異常通信呼に関する
発信番号、着信番号、時刻情報、サービス種別、異常発
生イベント種別、内部エラー種別、無線チャネル番号、
使用無線基地番号、および使用回線番号からなる呼処理
関連データをメモリ回路に一時記憶する。通信が正常に
行われる状態になったときに、障害情報送信回路がメモ
リ回路に記憶した前記呼処理関連データを読み出し基地
局に送信する。基地局はこの呼処理関連データを移動体
通信用交換機を介して集中運用保守センタに中継する。
集中運用保守センタでは送信された呼処理関連データを
データベース装置が記録し、障害トレース分析、試験方
法の決定、試験パラメータの設定、および障害内容の統
計処理を行う。
When there is a service abnormality and the subscriber depresses the service abnormality switch, the control circuit causes the calling number, called number, time information, service type, abnormality occurrence event type, internal error type, wireless channel number,
The call processing related data including the used wireless base number and the used line number is temporarily stored in the memory circuit. When the communication is normally performed, the fault information transmitting circuit reads the call processing related data stored in the memory circuit and transmits it to the base station. The base station relays this call processing-related data to the centralized operation and maintenance center via the mobile communication exchange.
At the centralized operation and maintenance center, the database device records the transmitted call processing-related data, and performs failure trace analysis, test method determination, test parameter setting, and failure content statistical processing.

【0011】これにより、通信サービス異常に関する正
確な情報を得ることができ、障害内容の統計的処理を正
確に行うことができる。
As a result, it is possible to obtain accurate information regarding the abnormality in the communication service, and it is possible to accurately perform the statistical processing of the failure content.

【0012】[0012]

【実施例】次に、本発明実施例を図面に基づいて説明す
る。図1は本発明実施例の構成を示すブロック図、図2
は本発明実施例における呼処理関連データの構成を示す
図である。
Embodiments of the present invention will now be described with reference to the drawings. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG.
FIG. 3 is a diagram showing a structure of call processing related data in the embodiment of the present invention.

【0013】本発明実施例に係わる移動体通信システム
は、端末装置1と通信を行う基地局2とを備え、基地局
2は移動体通信用交換機3を介して集中運用保守センタ
20に接続され、その集中運用保守センタ20には障害
データを保持するためのデータベース装置19を備え、
基地局2には、無線送受信機12と、無線回線を介して
端末装置1のデータをセーブするメモリ回路6に保持さ
れたデータを読出してデータベース装置19に転送させ
る無線基地局制御回路13とを備える。
The mobile communication system according to the embodiment of the present invention comprises a terminal device 1 and a base station 2 for communication, and the base station 2 is connected to a centralized operation and maintenance center 20 via a mobile communication exchange 3. The centralized operation and maintenance center 20 is provided with a database device 19 for holding fault data,
The base station 2 is provided with a wireless transceiver 12 and a wireless base station control circuit 13 for reading the data held in the memory circuit 6 for saving the data of the terminal device 1 via a wireless line and transferring the data to the database device 19. Prepare

【0014】また、端末装置1は、通信を行う毎に基地
局2との間で接続応答プロトコルを実行し無線回線を設
定する制御回路8と、基地局2との間に双方向の通信を
行う無線送受信機9とを備え、本発明の特徴として、操
作により押下されるサービス異常スイッチ4と、データ
をセーブするメモリ回路6とメモリ回路6からの障害情
報を無線送受信機9を介して送信する障害情報送信回路
7とを備え、制御回路8は、サービス異常スイッチ4が
押下されたときにはその直前に実行された接続制御に係
るデータをメモリ回路6に一時保持させる制御手段を備
える。
Further, the terminal device 1 performs bidirectional communication between the base station 2 and the control circuit 8 which executes a connection response protocol with the base station 2 every time communication is performed and sets a wireless line. The wireless transmitter / receiver 9 for performing the operation is provided, and the features of the present invention include a service abnormality switch 4 pressed by an operation, a memory circuit 6 for saving data, and fault information from the memory circuit 6 transmitted via the wireless transmitter / receiver 9. The failure information transmission circuit 7 is provided, and the control circuit 8 is provided with a control means for temporarily holding in the memory circuit 6 the data relating to the connection control executed immediately before the service abnormality switch 4 is pressed.

【0015】さらに、制御回路8には、基地局2から到
来する制御信号にしたがってメモリ回路6に保持された
データを無線送受信機9からその基地局2に送信する制
御手段と、サービス異常スイッチ4が押下された後に基
地局2に対して自動的に接続を実行し、サービス異常ス
イッチ4が押下された旨の情報を基地局2に伝達する手
段とを備える。
Further, the control circuit 8 has control means for transmitting the data held in the memory circuit 6 from the radio transceiver 9 to the base station 2 according to the control signal coming from the base station 2, and the service abnormality switch 4. And means for automatically connecting to the base station 2 after pressing, and transmitting information to the effect that the service abnormality switch 4 has been pressed to the base station 2.

【0016】また、前記異常呼に関する呼処理関連デー
タは図2に示すように、発信番号、着信番号、時刻情
報、サービス種別、異常発生イベント種別、内部エラー
種別、無線チャネル番号、使用無線基地局番号、および
使用回線番号により構成される。
As shown in FIG. 2, the call processing related data relating to the abnormal call includes the calling number, the called number, the time information, the service type, the abnormal event type, the internal error type, the wireless channel number, and the wireless base station used. It consists of the number and the line number used.

【0017】次に、このように構成された本発明実施例
の動作について説明する。
Next, the operation of the embodiment of the present invention thus constructed will be described.

【0018】加入者により通信中にサービス異常と判断
され、サービス異常スイッチ4が押下されると、制御回
路8がその異常通信呼に関する発信番号5−1、着信番
号5−2、時刻情報5−3、サービス種別5−4、異常
発生イベント種別5−5、内部エラー種別5−6、無線
チャネル番号5−7、使用無線基地局番号5−8、およ
び使用回線番号5−9からなる呼処理関連データ5をメ
モリ回路6に一時記憶する。正常通信が可能な状態にな
ったときに、障害情報送信回路7が集中運用保守センタ
20のデータベース装置19に自動発信し、呼処理関連
データ5をメモリ回路6から読み出し無線送受信機9を
介して送信する。
When the subscriber judges that there is a service abnormality during communication and the service abnormality switch 4 is pressed, the control circuit 8 causes the caller number 5-1, the callee number 5-2 and the time information 5-for the abnormal communication call. 3, service type 5-4, abnormality occurrence event type 5-5, internal error type 5-6, wireless channel number 5-7, used wireless base station number 5-8, and used line number 5-9 The related data 5 is temporarily stored in the memory circuit 6. When the normal communication becomes possible, the fault information transmission circuit 7 automatically transmits to the database device 19 of the centralized operation and maintenance center 20, the call processing related data 5 is read from the memory circuit 6, and the radio transceiver 9 is used. Send.

【0019】送信された呼処理関連データ5は基地局2
の無線送受信機12に受信され、無線基地局制御回路1
3から移動体通信用交換機3のデータ受信回路14に送
信される。移動体通信用交換機3の中央処理装置16は
データ受信回路14から呼処理関連データ5を読み取り
データ送信回路15から集中運用保守センタ20のデー
タ受信回路17に送信する。データ受信回路17は呼処
理関連データ5にインデックス番号18を付加してデー
タベース装置19に記録し管理する。データベース装置
19では呼処理関連データをベースとして障害トレース
分析、試験方法の決定、試験パラメータの設定、および
障害内容の統計処理を行う。
The transmitted call processing related data 5 is the base station 2
Received by the wireless transceiver 12 of the wireless base station control circuit 1
3 to the data receiving circuit 14 of the mobile communication switching system 3. The central processing unit 16 of the mobile communication exchange 3 reads the call processing related data 5 from the data receiving circuit 14 and transmits it from the data transmitting circuit 15 to the data receiving circuit 17 of the centralized operation and maintenance center 20. The data receiving circuit 17 adds the index number 18 to the call processing related data 5 and records it in the database device 19 for management. The database device 19 performs failure trace analysis, test method determination, test parameter setting, and failure content statistical processing based on call processing related data.

【0020】[0020]

【発明の効果】以上説明したように本発明によれば、移
動体通信システムにおける通信サービス異常時に、移動
体端末からの操作入力により、異常に関する正確な情報
を得ることができ、自動的に、障害トレース分析、その
試験方法の決定、および試験パラメータの設定を行うこ
とができ、その障害内容の統計的処理を正確に行うこと
ができる効果がある。
As described above, according to the present invention, when a communication service is abnormal in a mobile communication system, it is possible to obtain accurate information about the abnormality by an operation input from a mobile terminal, and automatically. Fault trace analysis, determination of the test method, and setting of test parameters can be performed, and the statistical processing of the fault content can be performed accurately.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明実施例の構成を示すブロック図。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

【図2】本発明実施例における呼処理関連データの構成
を示す図。
FIG. 2 is a diagram showing a structure of call processing related data in the embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 端末装置 2 基地局 3 移動体通信用交換機 4 サービス異常スイッチ 5 呼処理関連データ 5−1 発信番号 5−2 着信番号 5−3 時刻情報 5−4 サービス種別 5−5 異常発生イベント種別 5−6 内部エラー種別 5−7 無線チャネル番号 5−8 使用無線基地局番号 5−9 使用回線番号 6 メモリ回路 7 障害情報送信回路 8 制御回路 9、12 無線送受信機 13 無線基地局制御回路 14、17 データ受信回路 15 データ送信回路 16 中央処理装置 18 インデックス番号 19 データベース装置 20 集中運用保守センタ 1 Terminal Device 2 Base Station 3 Mobile Communication Switch 4 Service Abnormality Switch 5 Call Processing Related Data 5-1 Calling Number 5-2 Called Number 5-3 Time Information 5-4 Service Type 5-5 Error Occurrence Event Type 5- 6 Internal error type 5-7 Radio channel number 5-8 Used radio base station number 5-9 Used line number 6 Memory circuit 7 Fault information transmission circuit 8 Control circuit 9, 12 Radio transceiver 13 Radio base station control circuit 14, 17 Data receiving circuit 15 Data transmitting circuit 16 Central processing unit 18 Index number 19 Database device 20 Centralized operation and maintenance center

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H04Q 7/34 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication H04Q 7/34

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 通信を行う毎に基地局との間で接続応答
プロトコルを実行し無線回線を設定する制御回路と、そ
の基地局との間に双方向の通信を行う無線送受信機とを
備えた端末装置において、 操作により押下されるサービス異常スイッチと、データ
セーブ・メモリ回路とを備え、 前記制御回路は、そのサービス異常スイッチが押下され
たときにはその直前に実行された接続制御に係るデータ
を前記データセーブ・メモリ回路に一時保持させる制御
手段を備えたことを特徴とする端末装置。
1. A control circuit for executing a connection response protocol with a base station to establish a wireless line each time communication is performed, and a wireless transceiver for bidirectional communication with the base station. The terminal device includes a service abnormality switch that is pressed by an operation and a data save memory circuit, and when the service abnormality switch is pressed, the control circuit stores data relating to the connection control executed immediately before. A terminal device comprising a control means for temporarily holding the data save memory circuit.
【請求項2】 前記制御回路には、基地局から到来する
制御信号にしたがって前記データセーブ・メモリ回路に
保持されたデータを前記無線送受信機からその基地局に
送信する制御手段を備えた請求項1記載の端末装置。
2. The control circuit comprises control means for transmitting the data held in the data save memory circuit from the wireless transceiver to the base station according to a control signal coming from the base station. 1. The terminal device according to 1.
【請求項3】 前記制御回路には、前記異常スイッチが
押下された後に基地局に対して自動的に接続を実行し異
常スイッチが押下された旨の情報をその基地局に伝達す
る手段を備えた請求項2記載の端末装置。
3. The control circuit comprises means for automatically connecting to a base station after the abnormal switch is pressed and transmitting information indicating that the abnormal switch has been pressed to the base station. The terminal device according to claim 2.
【請求項4】 請求項1ないし3のいずれかに記載の端
末装置と通信を行う基地局とを備え、その基地局は移動
体通信用交換機を介して集中運用保守センタに接続さ
れ、その集中運用保守センタには障害データを保持する
ためのデータベース装置を備え、 前記基地局には、無線回線を介して前記端末装置の前記
データセーブ・メモリ回路に保持されたデータを読出し
てそのデータベースに転送させる無線基地局制御回路を
備えたことを特徴とする移動体通信システム。
4. A base station that communicates with the terminal device according to claim 1, the base station being connected to a centralized operation and maintenance center via a mobile communication switch, and the centralized operation and maintenance center. The operation and maintenance center is provided with a database device for holding fault data, and the base station reads the data held in the data save memory circuit of the terminal device via a wireless line and transfers it to the database. A mobile communication system comprising a radio base station control circuit for controlling the mobile communication system.
【請求項5】 前記接続制御に係るデータは、発信番
号、着信番号、時刻情報、サービス種別、異常発生イベ
ント種別、内部エラー種別、無線チャネル番号、使用無
線基地局番号、および使用回線番号である請求項4記載
の移動体通信システム。
5. The connection control data includes a calling number, a called number, time information, a service type, an abnormal event type, an internal error type, a wireless channel number, a used wireless base station number, and a used line number. The mobile communication system according to claim 4.
JP5318206A 1993-12-17 1993-12-17 Mobile communication system Expired - Lifetime JP2616673B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5318206A JP2616673B2 (en) 1993-12-17 1993-12-17 Mobile communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5318206A JP2616673B2 (en) 1993-12-17 1993-12-17 Mobile communication system

Publications (2)

Publication Number Publication Date
JPH07177081A true JPH07177081A (en) 1995-07-14
JP2616673B2 JP2616673B2 (en) 1997-06-04

Family

ID=18096623

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5318206A Expired - Lifetime JP2616673B2 (en) 1993-12-17 1993-12-17 Mobile communication system

Country Status (1)

Country Link
JP (1) JP2616673B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100789898B1 (en) * 2001-12-27 2007-12-28 에스케이 텔레콤주식회사 Method for sending interference information of mobile phone in mobile communication system
US7988210B2 (en) 2006-10-20 2011-08-02 Kubota Corporation Cabin door device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS543401A (en) * 1977-06-10 1979-01-11 Hitachi Denshi Ltd State monitor system for mobile station
JPH04319992A (en) * 1991-04-19 1992-11-10 Pioneer Electron Corp Long-distance monitor control device for mobile body
JPH04345215A (en) * 1991-05-23 1992-12-01 Mitsubishi Electric Corp Mobile body communication distributted processing system
JPH05328505A (en) * 1992-05-19 1993-12-10 Hitachi Ltd Train monitoring apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS543401A (en) * 1977-06-10 1979-01-11 Hitachi Denshi Ltd State monitor system for mobile station
JPH04319992A (en) * 1991-04-19 1992-11-10 Pioneer Electron Corp Long-distance monitor control device for mobile body
JPH04345215A (en) * 1991-05-23 1992-12-01 Mitsubishi Electric Corp Mobile body communication distributted processing system
JPH05328505A (en) * 1992-05-19 1993-12-10 Hitachi Ltd Train monitoring apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100789898B1 (en) * 2001-12-27 2007-12-28 에스케이 텔레콤주식회사 Method for sending interference information of mobile phone in mobile communication system
US7988210B2 (en) 2006-10-20 2011-08-02 Kubota Corporation Cabin door device

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