JPH09163428A - Processing method when base station is in busy state for radio communication system - Google Patents

Processing method when base station is in busy state for radio communication system

Info

Publication number
JPH09163428A
JPH09163428A JP34583995A JP34583995A JPH09163428A JP H09163428 A JPH09163428 A JP H09163428A JP 34583995 A JP34583995 A JP 34583995A JP 34583995 A JP34583995 A JP 34583995A JP H09163428 A JPH09163428 A JP H09163428A
Authority
JP
Japan
Prior art keywords
base station
mobile terminal
busy state
call
busy
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
JP34583995A
Other languages
Japanese (ja)
Other versions
JP3398790B2 (en
Inventor
Takanobu Kamo
孝修 加茂
Takako Ono
貴子 大野
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.)
Kyocera Corp
Original Assignee
Kyocera 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 Kyocera Corp filed Critical Kyocera Corp
Priority to JP34583995A priority Critical patent/JP3398790B2/en
Publication of JPH09163428A publication Critical patent/JPH09163428A/en
Application granted granted Critical
Publication of JP3398790B2 publication Critical patent/JP3398790B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To improve the rate of call origination by performing communication while switching a busy base station to another linkable base station by searching other base stations by a mobile terminal when the base station is in a busy state. SOLUTION: In this processing method for radio communication system provided with plural base stations 1 and 2 connected to a telephone line and connected through a radio control channel to a mobile terminal 3 at all times, when the base station 1 or 2 is in the busy state, a link establishment refuse signal is early transmitted from the base station 1 or 2 corresponding to a call originated from the mobile terminal 3. The mobile terminal 3 received with the link establishment refuse signal searches the control channel of the other base station 2 or 1 and establishes a link channel.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明は、移動端末からの発
呼の際、基地局がビジー状態時は移動端末で制御チャネ
ルをサーチして他の基地局に切り替えてリンクチャネル
を確立することができる無線通信システムにおける基地
局ビジー状態時の処理方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention allows a mobile terminal to search for a control channel and switch to another base station to establish a link channel when a call is made from a mobile terminal and the base station is busy. The present invention relates to a processing method when a base station is busy in a wireless communication system that can be used.

【0002】[0002]

【従来の技術】図3はPHS基地局の構成例を示す図で
ある。従来よりPHS基地局1及び移動端末3の通信処
理システムは階層構造で構成されている。レイヤ1(第
1階層部)は主にハードウエアで構成され、通信路を設
定する通話設定部1−5からなり、アンテナ(図では省
略)を介して移動端末3と電波で信号の送受信を行なう
ようになっている。
2. Description of the Related Art FIG. 3 is a diagram showing a configuration example of a PHS base station. Conventionally, the communication processing system of the PHS base station 1 and the mobile terminal 3 has a hierarchical structure. Layer 1 (first layer section) is mainly composed of hardware, and comprises a call setting section 1-5 for setting a communication path, and transmits / receives a signal to / from the mobile terminal 3 by radio waves via an antenna (not shown). I am supposed to do it.

【0003】また、レイヤ2(第2階層部)はソフトウ
エアによる無線管理部1−4からなり、プロトコル処理
等のリンク制御を行なうようになっている。また、レイ
ヤ3(第3階層部)はメッセージレベルの管理を行なう
PBS管理部1−2で、回線制御部1−1、付加サービ
ス制御部1−3及び無線管理部1−4の管理を行なうよ
うになっている。各レイヤはそれぞれCPUを有しデー
タの処理を行なっている。
Further, the layer 2 (second layer portion) is composed of a radio management portion 1-4 by software, and is adapted to perform link control such as protocol processing. A layer 3 (third layer part) is a PBS management part 1-2 that manages a message level, and manages the line control part 1-1, the supplementary service control part 1-3 and the wireless management part 1-4. It is like this. Each layer has a CPU and processes data.

【0004】レイヤ2(第2階層部)の無線管理部1−
4は上位レイヤのPBS管理部1−2と通信する通信タ
スク1−4−1、下位レイヤの通路設定部1−5と通信
する通信タスク1−4−3、制御チャネル(CCH)を
制御する制御チャネルタスク1−4−2及びその他のタ
スクを有し、発呼(制御チャネル)してきた移動端末3
にリンクチャネル割当て処理(通信チャネルの割当処
理)等を行なうようになっている。
Radio management section 1 of layer 2 (second layer section)
Reference numeral 4 controls a communication task 1-4-1 that communicates with the PBS management unit 1-2 of the upper layer, a communication task 1-4-3 that communicates with the path setting unit 1-5 of the lower layer, and a control channel (CCH). A mobile terminal 3 having a control channel task 1-4-2 and other tasks and making a call (control channel)
Link channel allocation processing (communication channel allocation processing) and the like are performed.

【0005】また、レイヤ2(第2階層部)の無線管理
部1−4は移動端末3との通信量(トラフィック)が多
くなり処理不能の状態になればビジー信号を発信し、相
手の移動端末3に知らせて送信を一時停止させ、滞った
通信を処理することによりビジー制御を行なっている。
In addition, the radio management section 1-4 of the layer 2 (second layer section) sends a busy signal when the communication volume (traffic) with the mobile terminal 3 becomes large and the processing cannot be performed, and the other party moves. Busy control is performed by notifying the terminal 3 to temporarily stop the transmission and process the delayed communication.

【0006】レイヤ2(第2階層部)の無線管理部1−
4には複数のバッファを設け、受信データを蓄積して処
理しているが、常時、バッファの使用状況を監視してバ
ッファの残り数が設定値以下になると通信相手(移動端
末3)にビジー信号を送り、相手の通信を一時停止させ
て滞った通信データを処理し、使用可能なバッファの数
が復活してくると通信相手(移動端末3)にビジー回復
信号を送り、前記送信一時停止を解除し通信を開始す
る。以上の方法で通信ビジー制御を行なっている。
Radio management unit 1 of layer 2 (second layer)
4 has a plurality of buffers to store and process the received data. However, the usage status of the buffers is constantly monitored, and when the remaining number of buffers falls below the set value, the communication partner (mobile terminal 3) is busy. A signal is sent, communication of the other party is temporarily stopped to process the communication data that has been stagnant, and when the number of available buffers is restored, a busy recovery signal is sent to the other party of communication (mobile terminal 3) and the transmission is temporarily stopped. Cancel and start communication. Communication busy control is performed by the above method.

【0007】図4は従来のPHS基地局のビジー状態時
における制御方法を示す図である。移動端末3がPHS
基地局1のサービスエリア内から発呼する場合を図3及
び図4に基づいて説明する。移動端末3は通常、時刻t
1で電源を投入され、時刻t2で制御チャネルをサーチ
し、PHS基地局1の下り制御チャネル情報を受信して
いる状態にある。
FIG. 4 is a diagram showing a control method when the conventional PHS base station is in a busy state. Mobile terminal 3 is PHS
A case of making a call from within the service area of the base station 1 will be described with reference to FIGS. 3 and 4. The mobile terminal 3 is normally at time t
1, the power is turned on, the control channel is searched at time t2, and the downlink control channel information of the PHS base station 1 is being received.

【0008】時刻t4に移動端末3から発呼すると、リ
ンクチャネル確立要求がPHS基地局1へ送信され、P
HS基地局1ではビジー状態でなければ制御チャネルタ
スク1−4−2でリンクチャネル割当てを行ない、通話
設定部1−5を介して移動端末3へ通知し通話が開始さ
れる。ビジー状態の場合はリンクチャネル割当てができ
ず信号(リンク割当ての通知)が移動端末3へ返らな
い。
When a call is made from the mobile terminal 3 at time t4, a link channel establishment request is transmitted to the PHS base station 1 and P
If the HS base station 1 is not busy, the control channel task 1-4-2 allocates the link channel, notifies the mobile terminal 3 via the call setting unit 1-5, and the call is started. In the busy state, the link channel cannot be assigned and the signal (notice of link assignment) is not returned to the mobile terminal 3.

【0009】移動端末3は1.2秒後の時刻t6に再度
発呼し、リンクチャネル確立要求を再送信する。PHS
基地局1がビジー状態であれば規定回数(図では時刻t
6,t7,t8の3回)繰返し、なお、ビジー状態であ
れば時刻t9で発呼終了処理が行なわれる。
The mobile terminal 3 again makes a call at time t6, which is 1.2 seconds later, and retransmits the link channel establishment request. PHS
If the base station 1 is busy, a specified number of times (time t
(6, t7, t8 three times), and if the busy state, the call ending process is performed at time t9.

【0010】[0010]

【発明が解決しようとする課題】しかしながら、上述し
たように移動端末3がリンクチャネル確立要求を再送中
にPHS基地局1でビジー状態が回復されると通話可能
だが、ビジー状態を回復できなければ移動端末3は通話
できない。ユーザは移動端末3に通話可能な状態を示す
LCD表示が点灯されていて、更に、電波強度もハイレ
ベルにもかかわらず何故通話できないのかわからないと
いう問題があった。
However, as mentioned above, when the PHS base station 1 recovers the busy state while the mobile terminal 3 is retransmitting the link channel establishment request, it is possible to talk, but if the busy state cannot be recovered. The mobile terminal 3 cannot make a call. There is a problem that the user does not know why the mobile terminal 3 cannot make a call even though the LCD display indicating the callable state is lit and the radio wave intensity is high.

【0011】また、移動端末3がトラフィックの多いエ
リア(通信量の多いエリア)で発呼したときは他のPH
S基地局が近辺にある可能性があるが、従来の制御方法
では他のPHS基地局へ切り替えて通信することはでき
ないという問題があった。
When the mobile terminal 3 makes a call in an area with a large amount of traffic (area with a large amount of communication), another PH
There is a possibility that the S base station is in the vicinity, but there is a problem that the conventional control method cannot switch to another PHS base station for communication.

【0012】本発明は上述の点に鑑みてなされたもの
で、上記問題点を除去するために、無線基地局がビジー
状態時、移動端末は他の無線基地局をサーチして交信可
能な無線基地局に切り替え通信することにより発呼率を
向上させる無線通信システムにおける基地局ビジー状態
時の制御方法を提供することを目的とする。
The present invention has been made in view of the above points, and in order to eliminate the above-mentioned problems, when the radio base station is in a busy state, the mobile terminal searches for another radio base station to perform radio communication. An object of the present invention is to provide a control method when a base station is in a busy state in a wireless communication system in which a calling rate is improved by switching and communicating with a base station.

【0013】[0013]

【課題を解決するための手段】上記課題を解決するため
本願請求項1に記載の発明は、電話回線に接続された複
数の基地局を具備し、常時無線の制御チャネルを介して
移動端末と接続されている無線通信システムにおける基
地局ビジー状態時の処理方法であって、図1に示すよう
に、基地局がビジー状態の時、該基地局は前記移動端末
からの発呼に対してリンク確立拒否信号を発信し、該リ
ンク確立拒否信号を受信した移動端末は他の基地局の制
御チャネルをサーチしリンクチャネルを確立することを
特徴とする。
In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is provided with a plurality of base stations connected to a telephone line, and a mobile terminal and a mobile terminal are always connected via a wireless control channel. A method of processing when a base station is busy in a connected wireless communication system, wherein the base station is linked to a call from the mobile terminal when the base station is busy as shown in FIG. The mobile terminal which transmits the establishment refusal signal and receives the link establishment refusal signal searches the control channel of another base station and establishes the link channel.

【0014】また、請求項2に記載の発明は、請求項1
に記載の無線通信システムにおける基地局ビジー状態時
の処理方法において、基地局は通信処理を行う上位から
下位の複数のレイヤを有し、基地局がビジー状態の時、
移動端末から発呼に対し下位側のレイヤに通知をするこ
となくリンク確立拒否信号を発信することを特徴とす
る。
The invention described in claim 2 is the same as claim 1
In the processing method when the base station is in a busy state in the wireless communication system described in, the base station has a plurality of layers from the upper to the lower to perform communication processing, when the base station is busy,
It is characterized in that a link establishment refusal signal is transmitted from the mobile terminal to the call origination without notifying the lower layer.

【0015】[0015]

【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて詳細に説明する。図1は本発明に係るPHS
基地局のビジー状態時における制御方法を示す図であ
る。なお、本発明のPHS基地局の構成は図3と略同一
であるのでその説明は省略する。本発明のPHS基地局
のビジー状態時における制御方法を図1及び図3に従っ
て説明する。
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a PHS according to the present invention.
It is a figure which shows the control method at the time of a busy state of a base station. The configuration of the PHS base station of the present invention is substantially the same as that of FIG. 3, and therefore its explanation is omitted. A control method when the PHS base station of the present invention is in a busy state will be described with reference to FIGS. 1 and 3.

【0016】移動端末3は通常、時刻t1で電源を投入
され、時刻t2で制御チャネルをサーチし、PHS基地
局1の下り制御チャネル情報を受信している状態にあ
る。
The mobile terminal 3 is normally powered on at time t1, searches for a control channel at time t2, and is in a state of receiving downlink control channel information of the PHS base station 1.

【0017】図2に示すように、サービスエリア1aと
サービスエリア2aの共通エリアではPHS基地局2の
下り制御チャネル情報も受信できる状態にあるが、どち
らか一方(図ではPHS基地局1)の下り制御チャネル
情報を受信している。
As shown in FIG. 2, in the common area of the service area 1a and the service area 2a, the downlink control channel information of the PHS base station 2 can be received, but only one of them (the PHS base station 1 in the figure) is received. Downlink control channel information is received.

【0018】時刻t4に移動端末3から発呼すると、リ
ンクチャネル確立要求がPHS基地局1へ送信され、P
HS基地局1がビジー状態であれば下位レイヤである制
御チャネルタスク1−4−2はリンクチャネル割当てが
できず、リンクチャネル割当て拒否の信号を移動端末3
へ早急に返す(詳細後述)。移動端末3は時刻t6に発
呼できないことを確認し、時刻t7に他局(PHS基地
局2)の下り制御チャネルをサーチする。
When a call is made from the mobile terminal 3 at time t4, a link channel establishment request is transmitted to the PHS base station 1 and P
If the HS base station 1 is in a busy state, the control channel task 1-4-2, which is a lower layer, cannot perform link channel allocation, and sends a signal of link channel allocation refusal to the mobile terminal 3
Immediately return to (details described later). The mobile terminal 3 confirms that it cannot make a call at time t6, and searches for a downlink control channel of another station (PHS base station 2) at time t7.

【0019】移動端末3がサービスエリア2a内にあれ
ば(図2参照)、PHS基地局2の下り制御チャネルを
時刻t8に受信し、リンクチャネル確立要求をPHS基
地局2に送信する。PHS基地局2ではビジー状態でな
ければ時刻t9に該リンクチャネル確立要求を受け、リ
ンクチャネル割当てを行ない返信する。続いて、同期バ
ースト及び通話バースト信号を送受信し、データリンク
接続を行ない発呼シーケンス実行後通話が開始される。
When the mobile terminal 3 is within the service area 2a (see FIG. 2), the downlink control channel of the PHS base station 2 is received at time t8 and a link channel establishment request is transmitted to the PHS base station 2. If the PHS base station 2 is not in the busy state, it receives the link channel establishment request at time t9, allocates the link channel, and returns it. Then, a synchronous burst and a call burst signal are transmitted and received, a data link is connected, a call sequence is executed, and a call is started.

【0020】PHS基地局1(またはPHS基地局2)
はビジー状態に陥ると以下の処理を行なう。下り制御チ
ャネルの送信制御を行なう制御チャネルタスク1−4−
2はビジー状態を他のタスクから受け取り、ビジー状態
であることを記憶する。このビジー状態のPHS基地局
1(またはPHS基地局2)に対して移動端末3が発呼
すると、制御チャネルタスク1−4−2はリンクチャネ
ル確立要求を受信する。
PHS base station 1 (or PHS base station 2)
Performs the following processing when it falls into a busy state. Control channel task 1-4 for controlling transmission of downlink control channel
2 receives the busy status from another task and stores that it is busy. When the mobile terminal 3 makes a call to the busy PHS base station 1 (or PHS base station 2), the control channel task 1-4-2 receives the link channel establishment request.

【0021】リンクチャネル確立要求を受信した制御チ
ャネルタスク1−4−2はビジー状態なのでビジー状態
を早期に復旧するため上位レイヤ3のPBS管理部1−
2に対してリンクチャネルの割当てを要求せずにリンク
チャネルの割当て拒否(発呼拒否)の信号を通信タスク
1−4−3、通路設定部1−5を介して移動端末3に早
急に送信する。移動端末3は時刻t6にリンクチャネル
を割当て拒否を受信すると、このPHS基地局に対して
発呼は不可能と認識して、時刻t7に他のPHS基地局
の下り制御チャネルをサーチし、受信できればリンクチ
ャネル確立要求を送信する。
Since the control channel task 1-4-2 which has received the link channel establishment request is in the busy state, the PBS management unit 1 of the upper layer 3 1-to recover the busy state early.
2, a link channel allocation refusal signal (call refusal) is sent to the mobile terminal 3 immediately via the communication task 1-4-3 and the path setting unit 1-5 without requesting the link channel allocation to the mobile terminal 2. To do. When the mobile terminal 3 receives the refusal to allocate the link channel at the time t6, it recognizes that the PHS base station cannot make a call, and searches for a downlink control channel of another PHS base station at the time t7 to receive it. If possible, send a link channel establishment request.

【0022】上述したように、本実施例によれば移動端
末3は発呼時にPHS基地局がビジー状態であれば意図
的に他のPHS基地局へ切り替えて発呼を行なうことに
なる。通常、通信量の多い地区ではPHS基地局が密集
して設置される場合が多く、サービスエリアが重なり合
っている場所では本発明の制御方法で処理を行なうこと
により、移動端末3の発呼を行なうことができる。
As described above, according to the present embodiment, the mobile terminal 3 intentionally switches to another PHS base station to make a call if the PHS base station is busy at the time of calling. Usually, PHS base stations are often installed densely in an area with a large amount of communication, and in a place where service areas overlap, processing is performed by the control method of the present invention to call the mobile terminal 3. be able to.

【0023】なお、上記実施の形態においては、PHS
システムにおける基地局ビシー状態時の処理方法を例に
説明したが、本発明の基地局ビシー状態時の処理方法は
これに限定されるものではなく、無線通信システムにお
ける無線基地局ビジー状態時の処理に利用できることは
当然である。
In the above embodiment, PHS is used.
Although the processing method in the base station busy state in the system has been described as an example, the processing method in the base station busy state of the present invention is not limited to this, and the processing in the wireless base station busy state in the wireless communication system It is natural that it can be used for.

【0024】[0024]

【発明の効果】以上説明したように、本発明によれば下
記のような優れた効果が得られる。 (1)移動端末は発呼時に無線基地局がビジー状態であ
れば意図的に他の無線基地局へ切り替えて発呼を行なう
が、通常、通信量の多い地区では無線基地局が密集して
設置される場合が多く、サービスエリアが重なり合って
いる場所ではこのような制御方法で処理を行なうことに
より、移動端末の発呼率を向上させることができるとい
う優れた効果が得られる。
As described above, according to the present invention, the following excellent effects can be obtained. (1) A mobile terminal intentionally switches to another radio base station to make a call if the radio base station is busy at the time of calling, but in a high communication area, the radio base stations are usually crowded. In many cases where the service areas are installed, by performing the processing with such a control method in a place where the service areas overlap, the excellent effect that the calling rate of the mobile terminal can be improved is obtained.

【0025】(2)また、従来のビジー状態を回復せ
ず、移動端末に通話可能な状態を示すLCD表示が点灯
されていて、更に、電波強度もハイレベルにもかかわら
ず何故通話できないのかわからないという問題も少なく
なる。
(2) In addition, the conventional busy state is not recovered, the LCD display indicating that the mobile terminal is in a callable state is lit, and it is unknown why the call cannot be made even though the radio field intensity is high. The problem is reduced.

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

【図1】本発明に係るPHS基地局のビジー状態時にお
ける制御方法を示す図である。
FIG. 1 is a diagram showing a control method in a busy state of a PHS base station according to the present invention.

【図2】複数のPHS基地局のサービスエリアと移動端
末の位置関係を示す図である。
FIG. 2 is a diagram showing a positional relationship between service areas of a plurality of PHS base stations and mobile terminals.

【図3】PHS基地局の構成例を示す図である。FIG. 3 is a diagram showing a configuration example of a PHS base station.

【図4】従来のPHS基地局のビジー状態時における制
御方法を示す図である。
FIG. 4 is a diagram showing a control method when a conventional PHS base station is in a busy state.

【符号の説明】[Explanation of symbols]

1 PHS基地局 1−1 回線制御部 1−2 PBS管理部 1−3 付加サービス制御部 1−4−1 通信タスク 1−4−2 制御チャネルタスク 1−4−3 通信タスク 1−5 通話設定部 2 PHS基地局部 3 移動端末 1 PHS base station 1-1 Line control unit 1-2 PBS management unit 1-3 Supplementary service control unit 1-4-1 Communication task 1-4-2 Control channel task 1-4-3 Communication task 1-5 Call setting Part 2 PHS base station Part 3 Mobile terminal

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 電話回線に接続された複数の基地局を具
備し、常時無線の制御チャネルを介して移動端末と接続
されている無線通信システムにおける基地局ビジー状態
時の処理方法であって、 前記基地局がビジー状態の時、該基地局は前記移動端末
からの発呼に対してリンク確立拒否信号を発信し、該リ
ンク確立拒否信号を受信した前記移動端末は他の基地局
の制御チャネルをサーチしリンクチャネルを確立するこ
とを特徴とする無線通信システムにおける基地局ビジー
状態時の処理方法。
1. A method of processing when a base station is in a busy state in a wireless communication system, which comprises a plurality of base stations connected to a telephone line and is always connected to a mobile terminal through a wireless control channel, When the base station is in a busy state, the base station transmits a link establishment refusal signal in response to a call from the mobile terminal, and the mobile terminal receiving the link establishment refusal signal controls the control channel of another base station. Is established and a link channel is established, the processing method when the base station is in a busy state in a wireless communication system.
【請求項2】 前記基地局は通信処理を行なう上位から
下位の複数のレイヤを有し、基地局がビジー状態の時、
移動端末からの発呼に対し下位側のレイヤが上位のレイ
ヤに通知をすることなく前記リンク確立拒否信号を発信
することを特徴とする請求項1に記載の無線通信システ
ムにおける基地局ビジー状態時の処理方法。
2. The base station has a plurality of layers from upper to lower for performing communication processing, and when the base station is in a busy state,
2. The base station busy state in the wireless communication system according to claim 1, wherein the lower layer transmits the link establishment refusal signal in response to a call from the mobile terminal without notifying the upper layer. Processing method.
JP34583995A 1995-12-08 1995-12-08 Processing method when base station is busy in wireless communication system Expired - Fee Related JP3398790B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34583995A JP3398790B2 (en) 1995-12-08 1995-12-08 Processing method when base station is busy in wireless communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34583995A JP3398790B2 (en) 1995-12-08 1995-12-08 Processing method when base station is busy in wireless communication system

Publications (2)

Publication Number Publication Date
JPH09163428A true JPH09163428A (en) 1997-06-20
JP3398790B2 JP3398790B2 (en) 2003-04-21

Family

ID=18379338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34583995A Expired - Fee Related JP3398790B2 (en) 1995-12-08 1995-12-08 Processing method when base station is busy in wireless communication system

Country Status (1)

Country Link
JP (1) JP3398790B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012016042A (en) * 2011-08-23 2012-01-19 Fujitsu Ltd Data transmission device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012016042A (en) * 2011-08-23 2012-01-19 Fujitsu Ltd Data transmission device

Also Published As

Publication number Publication date
JP3398790B2 (en) 2003-04-21

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