JP2001320763A - Controlling method and system of call-waiting function in phs, and phs terminal with call-waiting function - Google Patents
Controlling method and system of call-waiting function in phs, and phs terminal with call-waiting functionInfo
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- JP2001320763A JP2001320763A JP2000134376A JP2000134376A JP2001320763A JP 2001320763 A JP2001320763 A JP 2001320763A JP 2000134376 A JP2000134376 A JP 2000134376A JP 2000134376 A JP2000134376 A JP 2000134376A JP 2001320763 A JP2001320763 A JP 2001320763A
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- Japan
- Prior art keywords
- information channel
- base station
- addition request
- call
- phs
- 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.)
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- Mobile Radio Communication Systems (AREA)
- Telephonic Communication Services (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＰＨＳ（簡易型携
帯電話：Personal Handy-phone System）におけるキャ
ッチホン機能を提供するＰＨＳにおけるキャッチホン機
能制御方法およびシステムならびにキャッチホン機能付
ＰＨＳ端末に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PHS (Personal Handy-phone System) for providing a call waiting function in a PHS (Personal Handy-phone System) and a PHS terminal with a call waiting function.
【０００２】[0002]
【従来の技術】従来、通話中に別の相手から電話がかか
ってくると、交換機から信号音によって通知し、通話者
がフックスイッチを押すことによって現在の通話相手を
保留にしたまま、後からかけてきた相手に応答でき、も
う一度フックスイッチを押すことによって元の通話相手
に切り替えるキャッチホンサービスがある。このキャッ
チホンサービスは、フッキングごとに通話相手を切り替
える装置を加入者線と交換機の間に挿入することによっ
て実現している。2. Description of the Related Art Conventionally, when a call is received from another party during a telephone call, a notification is made by a signal tone from an exchange, and the caller presses a hook switch to hold the current party on hold, and thereafter, There is a call waiting service that can answer the caller and switch to the original caller by pressing the hook switch again. This call waiting service is realized by inserting a device for switching the call partner for each hooking between the subscriber line and the exchange.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ＰＨＳ
でキャッチホンサービスの実現を考えた場合、ＰＨＳ端
末だけでなく基地局側に対しても大幅な変更が必要とな
る。SUMMARY OF THE INVENTION However, PHS
Considering the implementation of the call waiting service, a significant change is required not only for the PHS terminal but also for the base station.
【０００４】そこで本発明は、上記従来の問題点を解消
すべく、６４ｋｂｉｔ／ｓ非制限情報伝達サービスに着
目し、その制御シーケンスを用いいることにより、容易
にＰＨＳにおけるキャッチホン機能を実現する、ＰＨＳ
におけるキャッチホン機能制御方法およびシステムなら
びにキャッチホン機能付ＰＨＳ端末を提供することを目
的とする。In view of the above, the present invention focuses on a 64 kbit / s unrestricted information transmission service to solve the above-mentioned conventional problems, and easily realizes a call waiting function in a PHS by using a control sequence thereof.
It is an object of the present invention to provide a method and system for controlling a call waiting function in a telephone and a PHS terminal with call waiting function.
【０００５】[0005]
【課題を解決するための手段】上述の課題を解決するた
め、本発明は、６４ｋｂｉｔ／ｓ非制限情報伝達サービ
ス対応のＰＨＳにおいて、基地局にて、第１情報チャネ
ルにて通話状態にあるＰＨＳ端末に対し着信があった場
合、空いている通信用スロットの有無を確認するステッ
プと、空いている通信用スロット有りの場合、前記ＰＨ
Ｓ端末に情報チャネル追加要求指示を通知するステップ
と、前記ＰＨＳ端末にて、前記基地局から前記情報チャ
ネル追加要求指示を受けて、着信のあったことをユーザ
に通知するステップと、前記ユーザの操作により、前記
基地局に情報チャネル追加要求を通知するステップと、
前記基地局にて、前記ＰＨＳ端末から前記情報チャネル
追加要求を受けて、前記ＰＨＳ端末との間で第２情報チ
ャネルの確立を行うステップと、前記ＰＨＳ端末にて、
前記第２情報チャネルの確立後、その第２情報チャネル
を通話状態とすると共に、前記第１情報チャネルを保留
状態とするステップとを含むことを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a PHS which supports a 64 kbit / s unrestricted information transmission service and has a PHS in a call state on a first information channel at a base station. Confirming the presence or absence of a vacant communication slot when there is an incoming call to the terminal;
Notifying the S terminal of an information channel addition request instruction; receiving, by the PHS terminal, the information channel addition request instruction from the base station, notifying the user that there is an incoming call; Notifying the base station of an information channel addition request by an operation;
The base station receives the information channel addition request from the PHS terminal, and establishes a second information channel with the PHS terminal;
After the establishment of the second information channel, setting the second information channel to a talk state and setting the first information channel to a hold state.
【０００６】以上の構成によって、基地局側（６４ｋｂ
ｉｔ／ｓ非制限情報伝達サービス対応）にハード的な変
更無く、簡単な機能追加で、容易にＰＨＳにおけるキャ
ッチホン機能を実現できる。With the above configuration, the base station side (64 kb)
It is possible to easily realize the call waiting function in the PHS by adding a simple function without hardware change to the it / s unrestricted information transmission service.
【０００７】[0007]
【発明の実施の形態】次に、本発明の実施の形態につい
て図面を参照して説明する。Next, embodiments of the present invention will be described with reference to the drawings.
【０００８】図１は本実施の形態の概略構成を示し、Ｐ
ＨＳ端末１と基地局（６４ｋｂｉｔ／ｓ非制限情報伝達
サービス対応）２とを含み、基地局２は電話網に接続さ
れている。ＰＨＳ端末１は無線部１１、制御部１２、表
示部１３、操作部１４を有し、基地局２は制御部２１、
無線部２２を有する。ＰＨＳ端末１の無線部１１と基地
局２の無線部２２とは、ＴＤＭＡ／ＴＤＤ(Time Divisi
on Multiple Access/Time Division Duplex)方式によ
り、１つの無線周波数をチャネル分割により８つに分割
し、上りと下りを１つの周波数で無線通信を行う。この
８つのチャネルのうち、上り用と下り用にそれぞれ制御
チャネルを１チャネルづつ使用し、残りの６チャネルで
基地局とＰＨＳ端末とが通信を行う。１つの通話チャネ
ルで３２ｋｂｉｔ／ｓのデータ通信を行うことができ、
この通話チャネルを２つ使用することで６４ｋｂｉｔ／
ｓのデータ通信を実現する。FIG. 1 shows a schematic configuration of the present embodiment.
An HS terminal 1 and a base station (corresponding to a 64 kbit / s unrestricted information transmission service) 2 are included, and the base station 2 is connected to a telephone network. The PHS terminal 1 has a radio unit 11, a control unit 12, a display unit 13, and an operation unit 14, and the base station 2 has a control unit 21,
It has a wireless unit 22. The radio unit 11 of the PHS terminal 1 and the radio unit 22 of the base station 2 communicate with each other by TDMA / TDD (Time Divisi
According to the Multiple Access / Time Division Duplex method, one radio frequency is divided into eight by channel division, and radio communication is performed using one frequency for uplink and downlink. Of the eight channels, one control channel is used for each of uplink and downlink, and the base station and the PHS terminal communicate with each other using the remaining six channels. 32 kbit / s data communication can be performed on one communication channel,
By using two communication channels, 64 kbit /
s data communication is realized.
【０００９】第１ＴＣＨ（情報チャネル：Traffic Chan
nel）にて通話状態にあるＰＨＳ端末１に対して着信が
あった場合、基地局２は制御部２１により空いている通
信用スロット（情報チャネル）の有無を確認する。空い
ている通信用スロット有りの場合、ＰＨＳ端末１に対し
無線部２２からＴＣＨ追加要求指示を通知する。ＰＨＳ
端末１の無線部１１でＴＣＨ追加要求指示を受けると制
御部１２は表示部１３にて光、音、振動等で第２の着信
があったことをユーザに知らせる。ユーザが第２の着信
を受ける場合、操作部１４でボタン押下等の操作を行う
ことにより、無線部１１からＴＣＨ追加要求を通知す
る。The first TCH (information channel: Traffic Chan)
nel), when there is an incoming call to the PHS terminal 1 which is in a call state, the base station 2 uses the control unit 21 to check whether there is a free communication slot (information channel). If there is a vacant communication slot, the wireless unit 22 notifies the PHS terminal 1 of a TCH addition request instruction. PHS
When the wireless unit 11 of the terminal 1 receives the TCH addition request instruction, the control unit 12 notifies the user of the second incoming call on the display unit 13 by light, sound, vibration, or the like. When the user receives the second incoming call, the operation unit 14 performs an operation such as pressing a button, thereby notifying the wireless unit 11 of a TCH addition request.
【００１０】基地局２は無線部２２でＴＣＨ追加要求を
受けるとＰＨＳ端末１との間で第２ＴＣＨの確立を行
う。第２ＴＣＨが確立後、第１ＴＣＨは保留状態とし、
第２ＴＣＨを通話状態とする。通話状態とするＴＣＨの
切り替え、及び、ＴＣＨの切断はＰＨＳ端末１の操作部
１４にてボタン押下等の操作で行う。When the base station 2 receives the TCH addition request in the radio section 22, it establishes the second TCH with the PHS terminal 1. After the second TCH is established, the first TCH is put on hold,
The second TCH is set to a call state. Switching of the TCH to be in the talking state and disconnection of the TCH are performed by an operation such as pressing a button on the operation unit 14 of the PHS terminal 1.
【００１１】次に、図２に示すフローチャートを参照し
て、本実施の形態の動作について詳細に説明する。第１
ＴＣＨにて通話状態にあるＰＨＳ端末１に対し着信があ
った場合（Ｓ１，Ｓ２）、基地局２は制御部２１により
空いている通信用スロットの有無を確認する（Ｓ３）。
空いている通信用スロット有りの場合、ＰＨＳ端末１に
対し第１ＴＣＨのＳＡＣＣＨ（低速付随制御チャネル）
を用いて無線部２２からＴＣＨ追加要求指示を通知する
（Ｓ４）。Next, the operation of this embodiment will be described in detail with reference to the flowchart shown in FIG. First
When there is an incoming call to the PHS terminal 1 that is in a talking state by the TCH (S1, S2), the base station 2 checks the presence or absence of an empty communication slot by the control unit 21 (S3).
If there is an empty communication slot, the first TCH SACCH (low-speed associated control channel) for the PHS terminal 1
Then, a TCH addition request instruction is notified from the wireless unit 22 by using (step S4).
【００１２】図３は通信用物理スロットのフォーマット
を示す。ＡＣＣＨはＴＣＨ（情報チャネル）に付随した
双方向チャネルであり、呼接続に必要な制御情報および
ユーザパケットデータ転送を行う。ＴＣＨに常時付随し
たＡＣＣＨをＳＡＣＣＨ(slow associated control cha
nnel)、一時的にＴＣＨをスチールして高速のデータ転
送を行うチャネルをＦＡＣＣＨ(fast associated contr
ol channel)とする。このＴＣＨに常時付随したＳＡＣ
ＣＨの情報フィールドを用いて、基地局２からＰＨＳ端
末１に対しＴＣＨ追加要求指示を通知し、ＰＨＳ端末１
から基地局２に対しＴＣＨ追加要求を通知する。FIG. 3 shows a format of a communication physical slot. The ACCH is a bidirectional channel attached to the TCH (information channel), and performs control information necessary for call connection and user packet data transfer. The ACCH that is always associated with the TCH is defined as a SACCH (slow associated control cha).
nnel) and a channel for fast data transfer by temporarily stealing the TCH is called a FACCH (fast associated contr.
ol channel). SAC always attached to this TCH
Using the information field of the CH, the base station 2 notifies the PHS terminal 1 of a TCH addition request instruction, and the PHS terminal 1
Notifies the base station 2 of a TCH addition request.
【００１３】次に、ＰＨＳ端末１の無線部１１でＴＣＨ
追加要求指示を受けると制御部１２は表示部１３にて
光、音、振動等で第２の着信があったことをユーザに知
らせる（Ｓ５）。ユーザが第２の着信を受ける場合、操
作部１４でボタン押下等の操作を行うことにより（Ｓ
７）、無線部１１から第１ＴＣＨのＳＡＣＣＨを用いて
ＴＣＨ追加要求を通知する（Ｓ８）。基地局２は無線部
２２でＴＣＨ追加要求を受けるとＰＨＳ端末１との間で
第２ＴＣＨの確立を行う（Ｓ９）。ここまでの手順はＲ
ＣＲ ＳＴＤ−２８の６４ｋｂｉｔ／ｓ非制限情報伝達
サービスの通信中第２ＴＣＨ追加（ＣＳ指示付き）制御
シーケンスによるものである。Next, the radio unit 11 of the PHS terminal 1
When receiving the addition request instruction, the control unit 12 notifies the user of the second incoming call on the display unit 13 by light, sound, vibration, or the like (S5). When the user receives the second incoming call, by performing an operation such as pressing a button on the operation unit 14 (S
7), the radio unit 11 notifies a TCH addition request using the SACCH of the first TCH (S8). Upon receiving the TCH addition request in the radio unit 22, the base station 2 establishes the second TCH with the PHS terminal 1 (S9). The procedure up to this point is R
This is due to a control sequence for adding a second TCH (with CS indication) during communication of the 64 kbit / s unrestricted information transmission service of CR STD-28.
【００１４】第２ＴＣＨが確立後、第２ＴＣＨを通話状
態とし、第１ＴＣＨは保留状態とし（Ｓ１０）、以降ユ
ーザによる操作部１４でのボタン押下等の操作により、
通話状態とするＴＣＨの切り替えを行う（Ｓ１２，Ｓ１
５）。After the second TCH is established, the second TCH is put into a talk state, the first TCH is put on hold (S10), and thereafter, when the user operates the operation unit 14 by pressing a button or the like,
Switching of TCH to be in a call state is performed (S12, S1)
5).
【００１５】図４は、本発明における通信用物理スロッ
トの通話／保留切り替えの様子を示す。ＴＤＭＡ／ＴＤ
Ｄ方式による上り用と下り用のそれぞれ３つの通信用物
理スロットのうち、基地局２から第１ＴＣＨに対応する
下りのＴ＃１を用いて送信し、ＰＨＳ端末１ではＲ＃１
として受信する。ＰＨＳ端末１からは第１ＴＣＨに対応
する上りのＴ＃１を用いて送信し、基地局２ではＲ＃１
として受信する。他からの着信があった場合、Ｔ＃３お
よびＲ＃３を第２ＴＣＨに対応させ、通信を確立する。
そして第１ＴＣＨに対応するＲ＃１およびＴ＃１と、第
２ＴＣＨに対応するＲ＃３およびＴ＃３とを切り替え、
一方を通話、他方を保留とする。FIG. 4 shows how the communication physical slot is switched between talk and hold in the present invention. TDMA / TD
Of the three communication physical slots for uplink and downlink according to the D scheme, transmission is performed from the base station 2 using the downlink T # 1 corresponding to the first TCH.
As received. The PHS terminal 1 transmits using uplink T # 1 corresponding to the first TCH, and the base station 2 transmits R # 1
As received. When there is an incoming call from another, T # 3 and R # 3 are made to correspond to the second TCH, and communication is established.
Then, R # 1 and T # 1 corresponding to the first TCH and R # 3 and T # 3 corresponding to the second TCH are switched,
One is on call and the other is on hold.
【００１６】また、通話状態にあるＴＣＨの切断につい
ても操作部１４でのボタン押下等の操作で行う（Ｓ１
６，Ｓ１７）。The disconnection of the TCH in a call state is also performed by an operation such as pressing a button on the operation unit 14 (S1).
6, S17).
【００１７】[0017]
【発明の効果】以上説明したように、本発明は、基地局
側（６４ｋｂｉｔ／ｓ非制限情報伝達サービス対応）に
ハード的な変更無く、情報チャネルに常時付随したＳＡ
ＣＣＨの情報フィールドを用いて、基地局からＰＨＳ端
末に対し情報チャネル追加要求指示を通知し、ＰＨＳ端
末から基地局に対し情報チャネル追加要求を通知し、さ
らにＰＨＳ端末に通信用物理スロット切り替え機能を持
たせることにより、容易にＰＨＳにおけるキャッチホン
機能を実現できる。As described above, according to the present invention, the base station side (corresponding to the 64 kbit / s unrestricted information transmission service) does not have any hardware change and the SA always attached to the information channel.
Using the information field of the CCH, the base station notifies the PHS terminal of an information channel addition request instruction, the PHS terminal notifies the base station of an information channel addition request, and further provides the PHS terminal with a communication physical slot switching function. With this, the call waiting function in the PHS can be easily realized.
【図１】本発明に係る実施の形態の概略構成図である。FIG. 1 is a schematic configuration diagram of an embodiment according to the present invention.
【図２】本発明に係る実施の形態のフローチャートであ
る。FIG. 2 is a flowchart of an embodiment according to the present invention.
【図３】通信用物理スロットのフォーマットを示す図で
ある。FIG. 3 is a diagram showing a format of a communication physical slot.
【図４】本発明における通信用物理スロットの通話／保
留切り替えを示すタイムチャートである。FIG. 4 is a time chart showing a call / hold switch of a communication physical slot according to the present invention.
１ ＰＨＳ端末 ２ 基地局 1 PHS terminal 2 Base station
Claims (6)
対応のＰＨＳにおいて、 基地局にて、第１情報チャネルにて通話状態にあるＰＨ
Ｓ端末に対し着信があった場合、空いている通信用スロ
ットの有無を確認するステップと、 空いている通信用スロット有りの場合、前記ＰＨＳ端末
に情報チャネル追加要求指示を通知するステップと、 前記ＰＨＳ端末にて、前記基地局から前記情報チャネル
追加要求指示を受けて、着信のあったことをユーザに通
知するステップと、 前記ユーザの操作により、前記基地局に情報チャネル追
加要求を通知するステップと、 前記基地局にて、前記ＰＨＳ端末から前記情報チャネル
追加要求を受けて、前記ＰＨＳ端末との間で第２情報チ
ャネルの確立を行うステップと、 前記ＰＨＳ端末にて、前記第２情報チャネルの確立後、
その第２情報チャネルを通話状態とすると共に、前記第
１情報チャネルを保留状態とするステップとを含むこと
を特徴とするＰＨＳにおけるキャッチホン（登録商標）
機能制御方法。1. A PHS compatible with a 64 kbit / s unrestricted information transmission service, comprising: a base station which is in a call state on a first information channel;
When there is an incoming call to the S terminal, a step of confirming the presence or absence of a vacant communication slot; and, if there is a vacant communication slot, a step of notifying the PHS terminal of an information channel addition request instruction, A step of, at the PHS terminal, receiving the information channel addition request instruction from the base station and notifying a user that there is an incoming call; and a step of notifying the base station of the information channel addition request by the operation of the user. At the base station, receiving the information channel addition request from the PHS terminal, and establishing a second information channel with the PHS terminal; and at the PHS terminal, the second information channel After the establishment of
Placing the second information channel in a call state and placing the first information channel in a hold state.
Function control method.
記第１情報チャネルのＳＡＣＣＨ（低速付随制御チャネ
ル）を用いて前記情報チャネル追加要求指示を通知し、 前記ＰＨＳ端末から前記基地局に対し、前記第１情報チ
ャネルのＳＡＣＣＨを用いて前記情報チャネル追加要求
を通知することを特徴とするＰＨＳにおけるキャッチホ
ン機能制御方法。2. The base station notifies the PHS terminal of the information channel addition request instruction using the SACCH (low-speed associated control channel) of the first information channel. And notifying the information channel addition request using the SACCH of the first information channel.
対応のＰＨＳにおいて、 基地局は、第１情報チャネルにて通話状態にあるＰＨＳ
端末に対し着信があった場合、空いている通信用スロッ
トの有無を確認する手段と、 空いている通信用スロット有りの場合、前記ＰＨＳ端末
に情報チャネル追加要求指示を通知する手段と、 前記ＰＨＳ端末から情報チャネル追加要求を受けて、前
記ＰＨＳ端末との間で第２情報チャネルの確立を行う手
段とを有し、 前記ＰＨＳ端末は、前記基地局から前記情報チャネル追
加要求指示を受けて、着信のあったことをユーザに通知
する手段と、 前記ユーザの操作により、前記基地局に前記情報チャネ
ル追加要求を通知する手段と、 前記第２情報チャネルの確立後、その第２情報チャネル
を通話状態とすると共に、前記第１情報チャネルを保留
状態とする手段とを有することを特徴とするＰＨＳにお
けるキャッチホン機能制御システム。3. A PHS compatible with a 64 kbit / s unrestricted information transmission service, wherein the base station is in a call state on the first information channel.
A means for confirming the presence or absence of a vacant communication slot when an incoming call is received by the terminal; a means for notifying the PHS terminal of an information channel addition request instruction when there is a vacant communication slot; Receiving an information channel addition request from a terminal, and establishing a second information channel with the PHS terminal. The PHS terminal receives the information channel addition request instruction from the base station, Means for notifying a user that there is an incoming call; means for notifying the base station of the information channel addition request by the operation of the user; and, after establishing the second information channel, a call on the second information channel. And a means for setting the first information channel to a hold state, and a call waiting function control system in the PHS.
情報チャネルのＳＡＣＣＨ（低速付随制御チャネル）を
用いて前記情報チャネル追加要求指示を通知し、 前記ＰＨＳ端末は、前記基地局に対し前記第１情報チャ
ネルのＳＡＣＣＨを用いて情報チャネル追加要求を通知
することを特徴とする請求項３に記載のＰＨＳにおける
キャッチホン機能制御システム。4. The base station according to claim 1, wherein
The PHS terminal notifies the base station of the information channel addition request using the SACCH of the first information channel, and notifies the information channel addition request instruction using the SACCH (slow associated control channel) of the information channel. The call waiting function control system in a PHS according to claim 3, wherein
対応のＰＨＳにおいて、 第１情報チャネルにて通話状態のときに着信があった場
合、基地局から情報チャネル追加要求指示を受けて、着
信のあったことをユーザに通知する手段と、 前記ユーザの操作により、前記基地局に前記情報チャネ
ル追加要求を通知する手段と、 前記基地局との間で第２情報チャネルの確立後、その第
２情報チャネルを通話状態とすると共に、前記第１情報
チャネルを保留状態とする手段とを有することを特徴と
するキャッチホン機能付ＰＨＳ端末。5. In a PHS compatible with a 64 kbit / s unrestricted information transmission service, when an incoming call is received during a call on the first information channel, an information channel addition request instruction is received from the base station, and the incoming call is not received. Means for notifying a user that the information channel addition request has been sent to the base station by an operation of the user; and, after establishing a second information channel with the base station, the second information Means for setting a channel to a call state and setting the first information channel to a hold state.
ＡＣＣＨ（低速付随制御チャネル）を用いて前記情報チ
ャネル追加要求指示を受け、 前記基地局に対し前記第１情報チャネルのＳＡＣＣＨを
用いて情報チャネル追加要求を通知することを特徴とす
る請求項５に記載のキャッチホン機能付ＰＨＳ端末。6. The base station transmits S of the first information channel.
The information channel addition request indication is received using an ACCH (low-speed associated control channel), and the information channel addition request is notified to the base station using the SACCH of the first information channel. A PHS terminal with a call waiting function as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000134376A JP3667596B2 (en) | 2000-05-08 | 2000-05-08 | Catchphone function control method and system in PHS, and PHS terminal with catchphone function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000134376A JP3667596B2 (en) | 2000-05-08 | 2000-05-08 | Catchphone function control method and system in PHS, and PHS terminal with catchphone function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001320763A true JP2001320763A (en) | 2001-11-16 |
| JP3667596B2 JP3667596B2 (en) | 2005-07-06 |
Family
ID=18642664
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000134376A Expired - Fee Related JP3667596B2 (en) | 2000-05-08 | 2000-05-08 | Catchphone function control method and system in PHS, and PHS terminal with catchphone function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3667596B2 (en) |
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- 2000-05-08 JP JP2000134376A patent/JP3667596B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP3667596B2 (en) | 2005-07-06 |
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