JP3061335B2 - Communication control method - Google Patents
Communication control methodInfo
- Publication number
- JP3061335B2 JP3061335B2 JP2657593A JP2657593A JP3061335B2 JP 3061335 B2 JP3061335 B2 JP 3061335B2 JP 2657593 A JP2657593 A JP 2657593A JP 2657593 A JP2657593 A JP 2657593A JP 3061335 B2 JP3061335 B2 JP 3061335B2
- Authority
- JP
- Japan
- Prior art keywords
- communication
- terminals
- conversion
- exchange
- code conversion
- 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.)
- Expired - Lifetime
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- Mobile Radio Communication Systems (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、音声信号をコーディ
ックにより符号変換し、データをアダプタにより符号変
換して送受信する二つの端末が、複数の交換機を介して
通信中に、音声通信からファクシミリ通信のように通信
モードの変更が可能であり、かつ異なる符号化方式を用
いる端末の混在を許す通信網における通信制御方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to facsimile communication from voice communication while two terminals for transcoding a voice signal by a codec, transcoding data by an adapter, and transmitting / receiving data via a plurality of exchanges. The present invention relates to a communication control method in a communication network in which a communication mode can be changed as described above and terminals using different coding schemes can be mixed.
【０００２】[0002]
【従来の技術】従来の通信制御方法を用いたディジタル
移動無線通信網を図２に示す。いま移動無線端末１１は
無線通話回線１２、無線制御回線１３を介して交換局１
４と通信可能な状態にあり、移動無線端末１５は無線通
話回線１６、無線制御回線１７を介して、移動無線端末
１８は無線通話回線１９、無線制御回線２１を介してそ
れぞれ交換局２２と通信可能な状態にあるものとする。2. Description of the Related Art FIG. 2 shows a digital mobile radio communication network using a conventional communication control method. Now, the mobile radio terminal 11 is connected to the exchange 1 via the radio communication line 12 and the radio control line 13.
4, the mobile radio terminal 15 communicates with the switching center 22 via the radio communication line 16 and the radio control line 17, and the mobile radio terminal 18 communicates with the exchange 22 via the radio communication line 19 and the radio control line 21, respectively. It is assumed that it is possible.
【０００３】無線端末１１は音声符号化方式Ａで音声信
号を無線符号音声信号に変換し、またその逆の処理を行
うコーディック２３ａと、データ符号化方式Ｂでデータ
信号を無線符号化データ信号に変換し、またその逆の処
理を行うアダプタ２４ｂとを備え、無線端末１５は符号
化方式Ａのコーディック２５ａと符号化方式Ｂのアダプ
タ２６ｂとを備え、無線端末１８は符号化方式Ｃのコー
ディック２７ｃと、符号化方式Ｄのアダプタ２８ｄとを
備えている。A wireless terminal 11 converts a speech signal into a radio-coded speech signal using a speech coding scheme A, and performs a reverse process on the codec 23a, and converts a data signal into a radio-coded data signal using a data coding scheme B. The wireless terminal 15 includes an encoding system A codec 25a and an encoding system B adapter 26b, and the wireless terminal 18 includes an encoding system C codec 27c. And an encoding system D adapter 28d.
【０００４】交換局１４には、音声符号化方式Ａの無線
符号化音声信号を有線符号化音声信号へ変換し、またそ
の逆の処理を行うコーディック２９ａと、データ符号化
方式Ｂの無線符号化データ信号を有線符号化データ信号
へ変換し、またその逆の処理を行うアダプタ３１ｂと、
音声符号化方式Ｃの無線符号化音声信号を有線符号化音
声信号に変換し、またその逆の処理を行うコーディック
３２ｃと、データ符号化方式Ｄの無線符号化データ信号
を有線符号化データ信号へ変換し、またその逆の処理を
行うアダプタ３３ｄとがそれぞれ複数設けられている。
同様に交換局２２には、無線符号化信号と有線符号化信
号との相互変換を行う符号化方式Ａのコーディック３４
ａ、符号化方式Ｂのアダプタ３５ｂ、符号化方式Ｃのコ
ーディック３６ｃ、符号化方式Ｄのアダプタ３７ｄがそ
れぞれ複数設けられている。The exchange 14 has a codec 29a for converting a radio coded voice signal of the voice coding system A into a wire coded voice signal and performing the reverse process, and a radio coding system of the data coding system B. An adapter 31b for converting the data signal into a wired encoded data signal and performing the reverse process;
A codec 32c that converts a wirelessly encoded audio signal of the audio encoding system C into a wired encoded audio signal and performs the reverse process, and converts the wirelessly encoded data signal of the data encoding system D into a wired encoded data signal. A plurality of adapters 33d for converting and performing the reverse process are provided.
Similarly, the exchange 22 has a coding system A codec 34 for performing mutual conversion between a wireless coded signal and a wired coded signal.
a, a plurality of adapters 35b of the encoding system B, a codec 36c of the encoding system C, and a plurality of adapters 37d of the encoding system D are provided.
【０００５】交換局１４の制御回路３８はセレクタ３９
を制御して無線回線と、コーディック２９ａ，３２ｃ、
アダプタ３１ｂ，３３ｄ、無変換路４１の何れかとの接
続、また交換局２２との回線４２の設定、その回線４２
とコーディック２９ａ，３２ｃ、アダプタ３１ｂ，３３
ｄ、無変換路４１の何れかとの接続制御、その他の交換
接続に必要な制御を行う。交換局１４の符号化方式判定
回路４３は、この交換局１４に無線回線を通じて接続さ
れた端末が用いる符号化方式を判定する。交換局２２に
も同様のセレクタ４４、無変換路４５、制御回路４６及
び符号化方式判定回路４７が設けられている。The control circuit 38 of the exchange 14 has a selector 39
To control the wireless line and the codecs 29a, 32c,
Connection with any one of the adapters 31b and 33d and the non-conversion path 41, setting of a line 42 with the exchange 22,
And codecs 29a and 32c, adapters 31b and 33
d. Control of connection to any one of the non-conversion paths 41 and other control necessary for exchange connection. The coding system determination circuit 43 of the exchange 14 determines an encoding system used by a terminal connected to the exchange 14 via a wireless line. The switching center 22 is also provided with a similar selector 44, non-conversion path 45, control circuit 46, and coding scheme determination circuit 47.
【０００６】いま、無線端末１１から無線端末１５への
通信要求が無線制御回線１３を通じて交換局１４へあっ
た場合、交換局１４の制御回路３８はその発信端末１
１、着信端末１５の各在圏エリア、各端末が受けている
サービス、使用符号化方式などを知るため、図に示して
いないホームメモリをアクセスする。その結果得られた
発信端末１１の音声符号化方式を符号化方式判定回路４
３で判定し、セレクタ３９を制御してその判定した符号
化方式の空きコーディックに無線端末１１との無線通話
回線１２を持続して、呼出音を無線端末１１へ送出す
る。また得られた着信端末１５に関する情報に基づき、
交換局２２への回線４２を設定して、その通話要求を交
換局２２へ通知し、この際に前記ホームメモリからの情
報により両端末１１、１５の符号化方式が同一であるこ
とを知り、このことも通知する。交換局２２は無線端末
１５を呼出す。無線端末１５からの応答があると、交換
局２２はセレクタ４４を制御して空きの無変換路４５に
無線通話回線１６を接続し、その接続通知を交換局１４
へ行い、交換局１４はその通知を受けてセレクタ４４を
制御して無線通話回線１２を空きの無変換路４１に接続
する。これにより、音声又はデータの符号無変換通信を
端末１１、１５間で行わせる。Now, when a communication request from the radio terminal 11 to the radio terminal 15 is sent to the exchange 14 via the radio control line 13, the control circuit 38 of the exchange 14 sends the call to the originating terminal 1
1. The home memory (not shown) is accessed in order to know each service area of the receiving terminal 15, the service received by each terminal, the encoding method used, and the like. The obtained voice coding scheme of the transmitting terminal 11 is determined by the coding scheme determination circuit 4.
3 and the selector 39 is controlled to maintain the wireless communication line 12 with the wireless terminal 11 in a vacant codec of the determined coding system and to transmit a ringing tone to the wireless terminal 11. Also, based on the obtained information on the receiving terminal 15,
A line 42 to the exchange 22 is set up and the call request is notified to the exchange 22. At this time, it is known from the information from the home memory that the coding schemes of both terminals 11 and 15 are the same, This is also notified. The exchange 22 calls the wireless terminal 15. When receiving a response from the wireless terminal 15, the exchange 22 controls the selector 44 to connect the wireless communication line 16 to the vacant non-conversion path 45, and transmits the connection notification to the exchange 14
The exchange 14 receives the notification and controls the selector 44 to connect the wireless communication line 12 to the vacant non-conversion path 41. As a result, codeless communication of voice or data is performed between the terminals 11 and 15.
【０００７】一方、無線端末１１から無線端末１８への
通信要求が無線制御回線１２を通じて交換局１４へあっ
た場合は交換局１４では同様の処理を行うが、無線端末
１１、１８が使用する符号化方式が互いに異なってお
り、交換局１４から交換局２２へ端末１８の符号化方式
も通知される。交換局２２が無線端末１８を呼出し、端
末１８から応答を受けると交換局２２は制御回路４６に
よりセレクタ４４を制御して空きのコーディック３６ａ
（又はアダプタ３７ｄ）と、無線通話回線１９とを接続
し、その接続通知を受けた交換局１４はコーディック２
９ａと無線通話回線１２とを接続した状態として（又は
空きアダプタ３１ｂと無線通話回線１２とを接続して）
無線端末１１、１８間は二度の音声（又はデータ）の符
号変換を経て通信を行う。On the other hand, when a communication request from the wireless terminal 11 to the wireless terminal 18 is sent to the exchange 14 via the wireless control line 12, the same processing is performed in the exchange 14, but the codes used by the wireless terminals 11 and 18 are used. The coding schemes are different from each other, and the exchange 14 also notifies the switching office 22 of the coding scheme of the terminal 18. When the exchange 22 calls the wireless terminal 18 and receives a response from the terminal 18, the exchange 22 controls the selector 44 by the control circuit 46 to control the empty codec 36a.
(Or the adapter 37d) and the wireless communication line 19, and the exchange 14 receiving the connection notice
9a and the wireless communication line 12 are connected (or the empty adapter 31b is connected to the wireless communication line 12).
Communication is performed between the wireless terminals 11 and 18 through code conversion of voice (or data) twice.
【０００８】[0008]
【発明が解決しようとする課題】上述した従来の通信制
御方法において、二つの無線端末間での通信中に、通信
モード変更、つまり音声通信中からファクシミリ通信や
パソコン通信などのデータ通信への変更、あるいはその
逆の変更を行う要求が無線端末から交換局へあった場
合、前記発信要求時の処理と同様にホームメモリをアク
セスして各端末の符号化方式を知ることを行っていると
処理に時間がかかり、通話中であるためそのように時間
がかかることは好ましくない、また固定端末との通信も
あり、従って交換局１４、２２で移動端末、固定端末の
何れと通信中かの判定をすることなく、制御回路３８、
４６はそれぞれセレクタ３９、４４を制御して対応した
アダプタ（又はコーディック）にその無線回線をそれぞ
れ接続するように制御して、それぞれ無線端末１１、１
５に通信モード変更応答信号を無線制御回線１３、１７
を介してそれぞれ返送する。In the above-described conventional communication control method, the communication mode is changed during communication between two wireless terminals, that is, a change from voice communication to data communication such as facsimile communication or personal computer communication. If the request to make a change is made from the wireless terminal to the exchange, the processing is performed when the home memory is accessed to know the encoding method of each terminal as in the processing at the time of the transmission request. It is not preferable to take such a long time because a call is in progress, and there is also communication with a fixed terminal. Therefore, the exchanges 14 and 22 determine whether communication is being performed with a mobile terminal or a fixed terminal. Control circuit 38,
46 controls the selectors 39 and 44, respectively, to control the wireless lines to be connected to the corresponding adapters (or codecs), respectively.
5, the communication mode change response signal is sent to the radio control lines 13 and 17
Return each via.
【０００９】よって、無線端末からの通信モードの変更
要求があるまで両無線端末１１、１５間で符号無変換で
の通信が行われていた場合でも、通信モードの変更要求
後は各交換局１４、２２内でそれぞれアダプタ（又はコ
ーディック）による符号変更が行われる通信となる。こ
のように二度の符号化変換を行うことにより接続遅延と
符号化歪みによる通信品質の劣化とが生じるという欠点
があった。Therefore, even if the communication without code conversion is performed between the two wireless terminals 11 and 15 until the request for changing the communication mode is made from the wireless terminal, each switching station 14 is switched after the request for changing the communication mode. , 22 in which the code is changed by the adapter (or codec). There is a drawback that performing the coding conversion twice in this manner results in deterioration of communication quality due to connection delay and coding distortion.
【００１０】この発明は、端末間での通信中に通信モー
ドを変更しても両端末間で同一符号化方式を用いた場合
は、網内を符号無変換で信号転送する通信を実現する通
信制御方法を提供することを目的とする。[0010] The present invention is a communication for realizing communication for transferring a signal without code conversion in a network when the same encoding method is used between both terminals even if the communication mode is changed during communication between the terminals. It is an object to provide a control method.
【００１１】[0011]
【課題を解決するための手段】この発明によれば、交換
局は端末間の通信開始の際に、その通信の信号転送形態
が二度の符号変化を行う符号変換転送形態か、符号変換
を行わない符号無変換転送形態かを記憶しておき、端末
間の通信中に、その何れかの端末から交換局に通信モー
ドの変更要求があると、その交換局はその通信の開始時
に先に記憶した信号転送形態を調べ、それが符号無変換
転送形態の場合は符号無変換信号転送を行い、符号変換
転送形態の場合は符号変換信号転送を行って、変更要求
された通信モードで端末間の通信を可能とする。According to the present invention, at the time of starting communication between terminals, the switching center determines whether the signal transfer form of the communication is a code conversion transfer form in which code changes twice or a code conversion. It stores the code-non-conversion transfer mode that is not performed, and if any of the terminals requests a change of the communication mode during the communication between the terminals, the exchange will start the communication at the start of the communication. The stored signal transfer mode is checked, and if it is the code-untransferred transfer mode, the code-unconverted signal transfer is performed. If the code-transfer-transfer mode is used, the code-translated signal transfer is performed. Communication.
【００１２】この場合、各端末はそのコーディックの符
号変換方式とアダプタの符号変換方式は予め決められた
組合せに限られている。In this case, each terminal is limited to a predetermined combination of the codec code conversion method and the adapter code conversion method.
【００１３】[0013]
【実施例】図１にこの発明を適用したディジタル移動通
信網を示し、図２と対応する部分に同一符号を付けてあ
る。無線端末間で新たに、通信を開始する場合の接続処
理は従来と同様であるが、この発明においては端末間の
通信が新たに確立した時点に、その通信の信号転送形態
が二度の符号変換を行う、つまり交換局でコーディック
又はアダプタを利用する符号変換転送形態か、符号変換
を行わない、つまりコーディックもアダプタを使用しな
い（無変換路を利用する）符号無変換転送形態かを交換
局１４、２２の信号転送形態記憶回路５１，５２に通信
単位で記憶する。FIG. 1 shows a digital mobile communication network to which the present invention is applied, and portions corresponding to those in FIG. 2 are denoted by the same reference numerals. The connection process when a new communication is started between wireless terminals is the same as the conventional one. However, in the present invention, when the communication between the terminals is newly established, the signal transfer form of the communication is twice a code. The exchange station performs conversion, that is, a code conversion / transfer mode in which a codec or an adapter is used in the exchange, or code conversion is not performed, that is, a codeless conversion / transfer mode in which a codec does not use an adapter (uses a non-conversion path) The signals are stored in the signal transfer mode storage circuits 51 and 52 in communication units 14 and 22, respectively.
【００１４】無線端末間の通信中にその無線端末が交換
局に通信モードの変更を要求すると、交換局は信号転送
形態記憶回路５１，５２に記憶されているその通信の信
号転送形態を読出し、それが符号変換転送形態の場合な
らば従来と同様に処理する。つまり、無線端末１１と無
線端末１８とが例えば音声通信中に、データ通信への変
更要求を一方の無線端末１１（又は１８）が交換局１４
（又は２２）へ行うと、この両端末間の通信は符号変換
転送形態であることがそれぞれ記憶回路５１，５２に記
憶されてあり、従って、無線端末１１，１８の符号化方
式を調べ、この例では符号化方式Ａと対をなす符号化方
式Ｂの空きのアダプタ３１ｂ、３５ｂにそれまで使用中
のコーディック２９ａ，３４ａを切替え接続して、二度
の符号化変換を行うデータ通信に切替える。When the wireless terminal requests the exchange to change the communication mode during communication between the wireless terminals, the exchange reads the signal transfer mode of the communication stored in the signal transfer mode storage circuits 51 and 52, and If this is the case of the code conversion transfer mode, processing is performed in the same manner as in the prior art. That is, while the wireless terminal 11 and the wireless terminal 18 are performing voice communication, for example, one of the wireless terminals 11 (or 18) issues a request to change to data communication.
(Or 22), it is stored in the storage circuits 51 and 52 that the communication between the two terminals is a code conversion transfer mode, and therefore, the coding method of the wireless terminals 11 and 18 is checked. In the example, the codecs 29a and 34a which have been used up to that time are switched and connected to the empty adapters 31b and 35b of the encoding system B which forms a pair with the encoding system A, and the communication is switched to the data communication in which the encoding conversion is performed twice.
【００１５】しかし通信モードの変更要求時に、その通
信中の信号転送形態が符号無変換転送形態であることが
記憶回路５１，５２から読出されると、つまり、例えば
無線端末１１と１５との音声通信中にデータ通信への変
更要求があると、この場合は前述したように音声通信は
交換局１４，２２で無変換路４１，４５を通じる符号無
変換信号転送が行われており、変更要求により記憶回路
５１，５２からその通信が符号無変換転送形態であるこ
とが読出され、この場合は交換局１４，１５はそれまで
の無変換路４１，４５を通じる信号転送をそのまま保持
しておいて、応答信号を無線制御回線１３，１７をそれ
ぞれ介して無線端末１１，１８へ送信する。これにより
データ通信に切替えられ、そのデータ通信は符号変換を
伴わない信号転送となる。よって符号変換が行われず、
それだけ信号遅延がなく、かつ信号品質もよいものとな
る。However, when the communication mode change request is read from the storage circuits 51 and 52 that the signal transfer mode during the communication is the code-unconverted transfer mode, that is, for example, the voice of the wireless terminals 11 and 15 is transmitted. If there is a request to change to data communication during communication, in this case, as described above, in the voice communication, the exchanges 14 and 22 perform code-unconverted signal transfer through the non-conversion paths 41 and 45, and Reads from the storage circuits 51 and 52 that the communication is in the codeless conversion transfer mode. In this case, the exchanges 14 and 15 hold the signal transfer through the non-conversion paths 41 and 45 as they are. Then, a response signal is transmitted to the wireless terminals 11 and 18 via the wireless control lines 13 and 17, respectively. As a result, the communication is switched to the data communication, and the data communication is signal transfer without code conversion. Therefore, no code conversion is performed,
Therefore, there is no signal delay and the signal quality is good.
【００１６】上述では、この発明方法の一例として移動
無線通信網に適用した場合をとりあげて説明を行ったが
この発明方法は有線マルチメディア通信システム等にお
いても適用できる。In the above description, a case where the present invention is applied to a mobile radio communication network has been described as an example. However, the present invention can also be applied to a wired multimedia communication system or the like.
【００１７】[0017]
【発明の効果】以上述べたようにこの発明によれば、同
一符号化方式を用いる端末間での通信時に、通信モード
を変更しても符号無変換で信号が転送され、よって接続
遅延・符号化歪みによる通信品質の劣化を防ぐことが可
能であり、しかも通信モードの変更を迅速に行うことが
できる。また、符号無変換による信号転送をする場合は
交換局内の符号化装置（コーディック、アダプタ）を使
用ぜずに通信を提供出来るため、交換局内の符号化装置
の有効利用を図ることが可能となる。As described above, according to the present invention, at the time of communication between terminals using the same coding method, signals are transferred without code conversion even if the communication mode is changed. It is possible to prevent the communication quality from deteriorating due to the distortion and to quickly change the communication mode. In addition, when signal transfer is performed without code conversion, communication can be provided without using an encoding device (codec, adapter) in the exchange, so that the encoding device in the exchange can be effectively used. .
【図１】この発明を適用したディジタル移動無線網の一
例を示すブロック図。FIG. 1 is a block diagram showing an example of a digital mobile radio network to which the present invention is applied.
【図２】従来の通信制御方法を利用するディジタル移動
無線網を示すブロック図。FIG. 2 is a block diagram showing a digital mobile radio network using a conventional communication control method.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０４Ｑ 7/38 (56)参考文献 特開 平５−63833（ＪＰ，Ａ) 特開 平６−6295（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04M 3/00 H04M 3/16 - 3/20 H04M 3/38 - 3/40 H04M 7/00 - 7/16 H04B 7/24 - 7/26 H04Q 7/00 - 7/38 ──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. 7 Identification symbol FI H04Q 7/38 (56) References JP-A-5-63833 (JP, A) JP-A-6-6295 (JP, A) ( 58) Field surveyed (Int.Cl. 7 , DB name) H04M 3/00 H04M 3/16-3/20 H04M 3/38-3/40 H04M 7/00-7/16 H04B 7/24-7 / 26 H04Q 7/00-7/38
Claims (1)
ータ符号変換を行うアダプタを有する複数の端末と、複
数種類の符号化方式のコーディック及びアダプタの複数
及び端末との情報を送受する制御回路を有する複数の交
換局を備え、端末と交換局とが通話回線及び制御回線で
接続された通信網において、 交換局は端末から他の端末への通信要求があると、これ
ら両端末の使用する符号化方式を調べ、これら符号化方
式が同一の場合は両端末間で符号無変換の通信を行い、 両端末の使用する符号化方式が異なる場合は交換局内及
び交換局間で一旦別の符号に変換して両端末間では二度
の符号変換による通信を行う通信制御方法において、 交換局は端末間の通信開始の際に、その通信の信号転送
形態が二度の符号変換を行う符号変換転送形態か、符号
変換を行わない符号無変換転送形態かを記憶しておき、 上記端末間の通信中に、その何れかの端末から交換局に
音声通信からデータ通信への変更あるいはその逆の変更
要求があると、その交換局はその通信の開始時に先に記
憶した信号転送形態を調べ、 それが符号無変換転送形
態の場合は符号無変換信号転送を行い、 上記符号変換転送形態の場合は符号変換信号転送を行っ
て、 上記変更要求された音声通信又はデータ通信で端末間の
通信を可能とすることを特徴とする通信制御方法。1. A plurality of terminals having a codec for performing speech code conversion and an adapter for performing data code conversion, and a plurality of terminals having a control circuit for transmitting and receiving information of a plurality of codecs and adapters of a plurality of types of coding systems and terminals. In a communication network in which a terminal and an exchange are connected by a communication line and a control line, when a communication request from the terminal to another terminal is made, the exchange uses an encoding method used by both terminals. the examined, these if encoding is identical to communicate unsigned conversion between both terminals, if the coding method used by the two terminals are different once converted into another code between switching center and the switching center In a communication control method in which communication is performed twice by code conversion between both terminals, when the communication between the terminals is started, the signal transfer form of the communication is a code conversion transfer form in which the code conversion is performed twice. Or the code-non-conversion transfer mode in which code conversion is not performed, and during communication between the terminals, any one of the terminals transmits to the exchange.
When there is a request to change from voice communication to data communication or vice versa , the exchange checks the previously stored signal transfer mode at the start of the communication, and if it is a codeless conversion transfer mode, performs a codeless conversion. A communication control method comprising: performing signal transfer; and performing code conversion signal transfer in the case of the code conversion transfer mode, to enable communication between terminals by the voice communication or data communication requested to be changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2657593A JP3061335B2 (en) | 1993-02-16 | 1993-02-16 | Communication control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2657593A JP3061335B2 (en) | 1993-02-16 | 1993-02-16 | Communication control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06244933A JPH06244933A (en) | 1994-09-02 |
| JP3061335B2 true JP3061335B2 (en) | 2000-07-10 |
Family
ID=12197356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2657593A Expired - Lifetime JP3061335B2 (en) | 1993-02-16 | 1993-02-16 | Communication control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3061335B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1155716A (en) | 1997-07-31 | 1999-02-26 | Nec Corp | Codec through system |
| JP3109594B2 (en) | 1998-08-18 | 2000-11-20 | 日本電気株式会社 | Mobile communication system and mobile terminal connection method |
| JP3701492B2 (en) | 1999-02-19 | 2005-09-28 | 富士通株式会社 | Gateway device |
-
1993
- 1993-02-16 JP JP2657593A patent/JP3061335B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06244933A (en) | 1994-09-02 |
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