JPH07177551A - Voice information transmission and reception method in radio selective calling - Google Patents

Voice information transmission and reception method in radio selective calling

Info

Publication number
JPH07177551A
JPH07177551A JP5321605A JP32160593A JPH07177551A JP H07177551 A JPH07177551 A JP H07177551A JP 5321605 A JP5321605 A JP 5321605A JP 32160593 A JP32160593 A JP 32160593A JP H07177551 A JPH07177551 A JP H07177551A
Authority
JP
Japan
Prior art keywords
voice information
call
information
carrier
base station
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
JP5321605A
Other languages
Japanese (ja)
Inventor
Yoshinori Hirokawa
美紀 廣川
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 Communication Systems Ltd
Original Assignee
NEC Communication Systems Ltd
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 Communication Systems Ltd filed Critical NEC Communication Systems Ltd
Priority to JP5321605A priority Critical patent/JPH07177551A/en
Publication of JPH07177551A publication Critical patent/JPH07177551A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the reduction in the system capacity for the radio selective calling service by using a carrier whose frequency is different from that of a carrier used for transmission of a call signal so as to send voice information whose information quantity is huge. CONSTITUTION:When transmission of voice information is required fo a pager terminal equipment 4, a call controller 2 connects a line from a telephone terminal 1 to a voice storage device 5 and sends an announcement and stores voice information from the telephone terminal 1. When identification information representing presence/absence of voice information to the pager terminal equipment 4 indicates the presence of the voice information, the call controller 2 adds frequency information representing a frequency for a carrier f2 different from a frequency of a carrier f1 used in common for a call for the transmission of voice information to a call signal and sends the resulting call signal to a base station equipment 4. The base station equipment 3 sends the call signal to the pager terminal equipment 4 by using the carrier f1, the call controller 2 sends the voice information to the base station equipment 3, and the base station equipment 3 sends the voice information to the pager terminal equipment 4 by using the carrier f2.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は無線選択呼出方法に関
し、特に発信者の音声情報をページャー端末に対して伝
送する音声情報送受信方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective calling method, and more particularly to a voice information transmitting / receiving method for transmitting voice information of a caller to a pager terminal.

【0002】[0002]

【従来の技術】従来の無線選択呼出における音声情報送
受信方法について図面を参照して説明する。図2(a)
は従来の音声情報送受信方法を適用する無線選択呼出シ
ステムの一例を示すブロック図であり、図2(b)は
(a)における動作を示す図であり、図2(c)は
(a)における送信する搬送波の使用例を示す図であ
る。
2. Description of the Related Art A conventional voice information transmission / reception method in radio selective calling will be described with reference to the drawings. Figure 2 (a)
2 is a block diagram showing an example of a radio selective calling system to which a conventional voice information transmitting / receiving method is applied, FIG. 2 (b) is a diagram showing an operation in (a), and FIG. 2 (c) is in (a). It is a figure which shows the usage example of the carrier wave to transmit.

【0003】図2(a)に示す無線選択呼出システム
は、発信側の電話端末1から送信されるダイヤル情報を
公衆網の交換機を介して受信分析しページャー端末の呼
出制御を行う呼出制御装置12と、電話端末1から音声
情報の送信があるとき呼出制御装置12の指示によりこ
の音声情報を蓄積する音声蓄積装置15と、呼出制御装
置12から送られるページャー端末を呼出するための呼
出信号とメッセージを音声で伝達するための音声情報と
を受信して符号化し搬送波f1 を用いて送信する基地局
装置13と、これらの符号化された呼出信号と音声信号
とを受信して復号化するページャー端末14とを備え
る。呼出制御装置12は通常、中央基地局に設けられ、
基地局装置13は広いサービスエリアをカバーするため
複数の周辺基地局に設けられる。本図では、複数の基地
局装置のうちの一つが示されている。
The wireless selective calling system shown in FIG. 2A receives and analyzes dial information transmitted from the telephone terminal 1 on the calling side through a switch of the public network, and controls the calling of the pager terminal 12. A voice accumulating device 15 for accumulating the voice information according to an instruction from the call control device 12 when the telephone terminal 1 transmits voice information, and a call signal and a message for calling the pager terminal sent from the call control device 12. Base station device 13 which receives and encodes voice information for transmitting by voice and transmits using carrier wave f 1 , and a pager which receives and decodes the coded call signal and voice signal. And a terminal 14. The call control device 12 is usually provided in a central base station,
The base station device 13 is provided in a plurality of peripheral base stations to cover a wide service area. In this figure, one of a plurality of base station devices is shown.

【0004】以下に図2(a)〜(c)を参照して動作
を説明する。
The operation will be described below with reference to FIGS.

【0005】発信側の電話端末1のダイヤルにより公衆
網の交換機(図示せず)が呼出制御装置12との間に回
線を設定する。呼出制御装置12でダイヤル受信後、音
声情報があるときには、呼出制御装置12の指示に従
い、音声情報が音声蓄積装置15に蓄積される。音声情
報の蓄積が終了すると、呼出制御装置12は、図2
(b)に示すように、基地局装置13に対して呼出信号
と音声情報とを送信する。基地局装置13は、搬送波f
1 ,例えば280MHz帯を使って呼出信号を送信して
ページャー端末14を呼出し、図2(c)に示すように
続けて同じ搬送波f1を使って音声情報を送る。ページ
ャー端末14は呼出信号を受けると、ベル音等により被
呼者に知らせ、続けて送られてくる音声情報を復号化し
て出力する。
An exchange (not shown) in the public network sets up a line with the call control unit 12 by dialing the telephone terminal 1 on the calling side. After the dialing is received by the call control device 12, when there is voice information, the voice information is stored in the voice storage device 15 according to the instruction of the call control device 12. When the accumulation of the voice information is completed, the call control device 12 is activated as shown in FIG.
As shown in (b), a call signal and voice information are transmitted to the base station device 13. The base station device 13 uses the carrier wave f
1 , the pager terminal 14 is called by transmitting a calling signal using, for example, the 280 MHz band, and voice information is continuously sent using the same carrier wave f 1 as shown in FIG. 2 (c). When the pager terminal 14 receives the calling signal, the pager terminal 14 notifies the called party by a bell sound or the like, and decodes and outputs the voice information continuously sent.

【0006】[0006]

【発明が解決しようとする課題】従来の音声情報送受信
方法では、呼出信号と音声情報とを共通の搬送波で送っ
ているので、この方法によると、音声情報量が膨大なた
め一回線当たりの回線占有時間が大きくなってしまい、
加入者数が限られてしまい、大容量のページングサービ
スが構築できないという問題点があった。
In the conventional voice information transmitting / receiving method, the ringing signal and the voice information are transmitted by a common carrier wave. Therefore, according to this method, the amount of voice information is enormous, and thus the line per line is large. Occupied time becomes large,
There is a problem that the number of subscribers is limited and a large capacity paging service cannot be constructed.

【0007】本発明の目的は、無線選択呼出サービスの
システム容量の低下を防ぐとともに、発呼者のメッセー
ジを音声情報としてページャー端末に直接送出するボイ
スメールサービスを実現することが可能な無線選択呼出
における音声情報送受信方法を提供することにある。
An object of the present invention is to prevent a decrease in the system capacity of the radio selective call service and to realize a voice selective service capable of directly transmitting a message of a caller as voice information to a pager terminal. To provide a method for transmitting and receiving voice information in.

【0008】[0008]

【課題を解決するための手段】本発明の無線選択呼出に
おける音声情報送受信方法は、無線選択呼出におけるペ
ージャー端末の呼出制御を行う呼出制御装置で呼出信号
の送出の際に、前記ページャー端末への音声情報の有無
を示す識別情報およびこの音声情報が存在する場合には
呼出しに共通的に使用される第1の搬送波と異なる第2
の搬送波の周波数を示す周波数情報を前記呼出信号に付
加し周辺の基地局に送出し、前記識別情報および前記周
波数情報が付加された呼出信号を前記第1の搬送波を用
いて前記基地局からページャー端末へ送信し、ページャ
ー端末で、受信した前記呼出信号が自端末への呼出であ
るか否かを確認し、自端末への呼出で且つ前記識別情報
が音声の存在を示すときには、ページャー端末の受信周
波数を前記周波数情報に基づき指定された前記第2の搬
送波に合わせて待機し、この第2の搬送波を用いて送信
される音声情報を受信する。
According to the method for transmitting and receiving voice information in a radio selective call according to the present invention, when a call signal is transmitted to a pager terminal by a call control device which controls the call of the pager terminal in the radio selective call. Identification information indicating the presence / absence of voice information and, if this voice information exists, a second carrier different from the first carrier commonly used for calling.
Frequency information indicating the frequency of the carrier wave of the carrier is added to the call signal and transmitted to the surrounding base stations, and the call signal added with the identification information and the frequency information is used from the base station to the pager using the first carrier wave. When the pager terminal transmits to the terminal and confirms whether the received call signal is a call to the own terminal, and when the call to the own terminal and the identification information indicates the presence of voice, the pager terminal The reception frequency is set to the second carrier designated based on the frequency information, and the unit waits, and the voice information transmitted using the second carrier is received.

【0009】[0009]

【実施例】次に、本発明について図面を参照して説明す
る。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

【0010】図1(a)は本発明の一実施例の音声情報
送受信方法を適用する無線選択呼出システムを示すブロ
ック図であり、図1(b)は(a)における動作を示す
図であり、図1(c)は(a)における送信する搬送波
の使用例を示す図である。
FIG. 1 (a) is a block diagram showing a radio selective calling system to which the voice information transmitting / receiving method of one embodiment of the present invention is applied, and FIG. 1 (b) is a diagram showing the operation in (a). FIG. 1C is a diagram showing an example of using the carrier wave to be transmitted in FIG.

【0011】図1(a)に示す無線選択呼出システム
は、発信側の電話端末1から送信されるダイヤル情報を
図示しない公衆網の交換機を介して受信分析しページャ
ー端末の呼出制御を行う呼出制御装置2と、電話端末1
から音声情報の送信があるとき呼出制御装置2の指示に
よりこの音声情報を蓄積する音声蓄積装置5と、呼出制
御装置2から送られるページャー端末を呼出すための呼
出信号とメッセージを音声で伝達するための音声情報と
を受信して符号化し搬送波f1 ,f2 を用いて送信する
基地局装置3と、これらの符号化された呼出信号と音声
信号を受信して復号化するページャー端末4とを備え
る。基地局装置3は、呼出信号を送信する搬送波f1
音声情報を送信する搬送波f2 とに対し異なる周波数帯
を選択する機能と、送信する音声情報の有無を示す情報
および音声情報が有るときにはこれを送信するための周
波数情報を呼出信号内に含める機能と、搬送波f2 で音
声情報を送信する機能とを備えている。呼出制御装置2
は通常、中央基地局に設けられ、基地局装置3は複数の
周辺基地局に設けられるが本図では、複数の基地局装置
のうちの一つが示されている。
The wireless selective calling system shown in FIG. 1A is a call control for receiving and analyzing dial information transmitted from a telephone terminal 1 on the calling side through a switch of a public network (not shown) to control call of a pager terminal. Device 2 and telephone terminal 1
For transmitting voice information from the call control device 2 when the voice information is transmitted from the call control device 2 and a call signal and a message for calling the pager terminal sent from the call control device 2 by voice. the base station apparatus 3 to be transmitted by using the received and encoded carrier f 1, f 2 and the audio information, and a pager terminal 4 to decrypt it receives these encoded call signal and a voice signal Prepare The base station device 3 has a function of selecting different frequency bands for the carrier wave f 1 for transmitting a calling signal and the carrier wave f 2 for transmitting voice information, and when there is information indicating the presence or absence of voice information to be transmitted and voice information. It has a function of including frequency information for transmitting this in the calling signal and a function of transmitting voice information by the carrier wave f 2 . Call control device 2
Is usually provided in the central base station, and the base station device 3 is provided in a plurality of peripheral base stations, but in this figure, one of the plurality of base station devices is shown.

【0012】上述した構成において、発信側の電話端末
1のダイヤルにより公衆網の交換機(図示せず)が呼出
制御装置2との間に回線を設定する。呼出制御装置2で
ダイヤル受信後、音声情報があるときには、呼出制御装
置2の指示に従い音声情報が音声蓄積装置5に蓄積され
る。音声情報の蓄積が終了すると、呼出制御装置2は図
1(b)に示すように、基地局装置3に対して呼出信号
と音声情報とを送信する。基地局装置3は搬送波f1
例えば280MHz帯を使って呼出信号を送信してペー
ジャー端末4を呼出し、図1(c)に示すように、続け
て搬送波f2 ,例えば280MHz帯以外で使用可能な
周波数を使って音声情報を送る。ページャー端末4は呼
出信号を受けると、ベル音等により被呼者に知らせ、続
けて送られてくる音声情報を復号化して出力する。
In the above-mentioned structure, a switch (not shown) in the public network establishes a line with the call control device 2 by dialing the calling side telephone terminal 1. After the dialing is received by the call control device 2, when there is voice information, the voice information is stored in the voice storage device 5 according to the instruction of the call control device 2. When the accumulation of voice information is completed, the call control device 2 transmits a call signal and voice information to the base station device 3, as shown in FIG. The base station device 3 uses the carrier wave f 1 ,
For example, a call signal is transmitted using the 280 MHz band to call the pager terminal 4, and as shown in FIG. 1C, the voice information is continuously transmitted using the carrier wave f 2 , for example, a frequency that is usable outside the 280 MHz band. . When the pager terminal 4 receives the call signal, the pager terminal 4 notifies the called party with a bell sound or the like, and decodes and outputs the voice information continuously sent.

【0013】搬送波f1 ,f2 は別々のアンテナから送
信されるように図示してあるが、これは理解を容易にす
るために示したもので実際は同一のアンテナから発射さ
れる。
Although the carriers f 1 and f 2 are shown as being transmitted from separate antennas, this is shown for ease of understanding and they are actually emitted from the same antenna.

【0014】次に、図1(a)〜(c)を参照して動作
について説明する。
Next, the operation will be described with reference to FIGS. 1 (a) to 1 (c).

【0015】電話端末1の加入者が発呼し、呼出しを希
望するページャー端末4の呼出番号をダイヤルする。呼
出制御装置2は、ページャー端末4に対して音声情報の
送信が必要な場合は電話端末1からの回線を音声蓄積装
置5に接続した後、音声蓄積装置5が電話端末1に対し
て「伝言をお送り下さい。」というアナウンスを送出し
て電話端末1から送られてくる音声情報を蓄積する。音
声情報の蓄積が終了すると、呼出制御に移行する。
The subscriber of the telephone terminal 1 makes a call and dials the calling number of the pager terminal 4 which desires to call. When it is necessary to send voice information to the pager terminal 4, the call control device 2 connects the line from the telephone terminal 1 to the voice storage device 5, and then the voice storage device 5 sends a message to the telephone terminal 1. Please send the announcement. ”And accumulate the voice information sent from the telephone terminal 1. When the accumulation of the voice information is completed, the call control is started.

【0016】まず呼出制御装置2は、ページャー端末4
への音声情報の有無を示す識別情報およびこの音声情報
が存在する場合にはこの音声情報送信のため呼出しに共
通的に使用される搬送波f1 と異なる搬送波f2 の周波
数を示す周波数情報を呼出信号に付加し、基地局装置3
に送出する。基地局装置3は、この識別情報および周波
数情報が付加された呼出信号を搬送波f1 を用いてペー
ジャー端末4へ送信する。次に、呼出制御装置2は基地
局装置3へ音声情報を送り、基地局装置3はこの音声情
報を搬送波f2 を使ってページャー端末4へ送信する。
First, the call control device 2 includes a pager terminal 4
Identification information indicating the presence or absence of voice information to the user, and when this voice information exists, the frequency information indicating the frequency of the carrier f 2 different from the carrier f 1 commonly used for calling to transmit this voice information is called. Base station device 3 added to the signal
Send to. The base station device 3 transmits the calling signal to which the identification information and the frequency information are added to the pager terminal 4 using the carrier wave f 1 . Next, the call control device 2 sends voice information to the base station device 3, and the base station device 3 transmits this voice information to the pager terminal 4 using the carrier wave f 2 .

【0017】ページャー端末4では、通常、受信機の周
波数を共通の搬送波f1 に合わせてあり、基地局装置3
からの送信を待っている。ページャー端末4では、基地
局装置3からの呼出信号を受信すると、まずこの呼出信
号によりページャー端末4自身に対するものかどうか確
認する。自端末に対するものだったら、更に音声情報が
有るかどうか識別情報によって確認し、音声情報が有り
の場合は、受信機の周波数を呼出信号内に含まれている
周波数情報による搬送波f2 に合わせて待機し、続けて
送られてくる音声情報を受信し蓄積する。音声情報の受
信が終了すると、ページャー端末4はベル音や振動など
で、ユーザーに音声情報を受信したことを知らせる。ペ
ージャー端末4のユーザーは、例えば音声出力ボタン等
で指示することにより、(あるいは蓄積完了後直ちに)
蓄積された音声情報をページャー端末4のスピーカから
聞くことが出来る。
In the pager terminal 4, the frequency of the receiver is usually adjusted to the common carrier wave f 1 , and the base station device 3
Waiting to be sent from. When the pager terminal 4 receives the calling signal from the base station device 3, first of all, the pager terminal 4 confirms whether or not the calling signal is for the pager terminal 4 itself. If it is for its own terminal, it is confirmed by the identification information whether or not there is voice information. If there is voice information, the frequency of the receiver is adjusted to the carrier wave f 2 based on the frequency information included in the calling signal. It waits and receives and stores the audio information that is sent continuously. When the reception of the voice information is completed, the pager terminal 4 informs the user that the voice information has been received by a bell sound or a vibration. The user of the pager terminal 4 can, for example, give an instruction using a voice output button or the like (or immediately after the accumulation is completed).
The accumulated voice information can be heard from the speaker of the pager terminal 4.

【0018】本実施例では呼出信号および音声情報の符
号化は基地局装置側で行う場合を説明したが、これらの
符号化を中央基地局側で行う構成としてもよい。
Although the call signal and the voice information are coded on the side of the base station apparatus in this embodiment, the coding may be performed on the side of the central base station.

【0019】[0019]

【発明の効果】以上説明したように本発明によれば、情
報量が膨大になる音声情報を呼出信号送信用に使用され
る搬送波とは別の周波数の搬送波を使い、呼出信号のた
めに共通に使われる搬送波の情報量を最小限に抑えるこ
とにより、呼出に使用している搬送波の一回線当たりの
占有時間を小さく抑えられ、大容量のページングシステ
ムの構築が可能となる。またメッセージを音声情報とし
て送信することにより、電話の掛けられない場所にいる
相手に対しても発呼者の用件を音声で伝達することがで
きる。
As described above, according to the present invention, the voice information, which has an enormous amount of information, uses a carrier having a frequency different from that of the carrier used for transmitting the calling signal, and is common for the calling signal. By minimizing the amount of information of the carrier wave used for, the occupied time per line of the carrier wave used for calling can be kept small and a large capacity paging system can be constructed. Further, by transmitting the message as voice information, the caller's requirement can be transmitted by voice to the other party in the place where the call cannot be made.

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

【図1】(a)は本発明の一実施例の音声情報送受信方
法を適用する無線選択呼出システムを示すブロック図で
ある。(b)は(a)における動作を示す図である。
(c)は(a)における送信する搬送波の使用例を示す
図である。
FIG. 1A is a block diagram showing a radio selective calling system to which a voice information transmitting / receiving method according to an embodiment of the present invention is applied. (B) is a figure which shows the operation | movement in (a).
(C) is a figure which shows the usage example of the carrier wave to transmit in (a).

【図2】(a)は従来の音声情報送受信方法を適用する
無線選択呼出システムの一例を示すブロック図である。
(b)は(a)における動作を示す図である。(c)は
(a)における送信する搬送波の使用例を示す図であ
る。
FIG. 2A is a block diagram showing an example of a radio selective calling system to which a conventional voice information transmitting / receiving method is applied.
(B) is a figure which shows the operation | movement in (a). (C) is a figure which shows the usage example of the carrier wave to transmit in (a).

【符号の説明】[Explanation of symbols]

1 電話端末 2 呼出制御装置 3 基地局装置 4 ページャー端末 5 音声蓄積装置 1 Telephone Terminal 2 Call Control Device 3 Base Station Device 4 Pager Terminal 5 Voice Storage Device

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 無線選択呼出におけるページャー端末の
呼出制御を行う呼出制御装置で呼出信号の送出の際に、
前記ページャー端末への音声情報の有無を示す識別情報
およびこの音声情報が存在する場合には呼出しに共通的
に使用される第1の搬送波と異なる第2の搬送波の周波
数を示す周波数情報を前記呼出信号に付加し周辺の基地
局に送出し、前記識別情報および前記周波数情報が付加
された呼出信号を前記第1の搬送波を用いて前記基地局
からページャー端末へ送信し、ページャー端末で、受信
した前記呼出信号が自端末への呼出であるか否かを確認
し、自端末への呼出で且つ前記識別情報が音声の存在を
示すときには、ページャー端末の受信周波数を前記周波
数情報に基づき指定された前記第2の搬送波に合わせて
待機し、この第2の搬送波を用いて送信される音声情報
を受信することを特徴とする無線選択呼出における音声
情報送受信方法。
1. A calling control device for controlling calling of a pager terminal in wireless selective calling, when sending a calling signal,
Identification information indicating the presence or absence of voice information to the pager terminal and, if this voice information is present, frequency information indicating a frequency of a second carrier different from the first carrier commonly used for calling is called. The signal is added to a signal and transmitted to a peripheral base station, and the call signal to which the identification information and the frequency information are added is transmitted from the base station to the pager terminal using the first carrier wave and received by the pager terminal. It is confirmed whether the call signal is a call to the own terminal, and when the call is to the own terminal and the identification information indicates the presence of voice, the reception frequency of the pager terminal is designated based on the frequency information. A method for transmitting and receiving voice information in radio selective calling, comprising: waiting for the second carrier wave and receiving voice information transmitted using the second carrier wave.
JP5321605A 1993-12-21 1993-12-21 Voice information transmission and reception method in radio selective calling Pending JPH07177551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5321605A JPH07177551A (en) 1993-12-21 1993-12-21 Voice information transmission and reception method in radio selective calling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5321605A JPH07177551A (en) 1993-12-21 1993-12-21 Voice information transmission and reception method in radio selective calling

Publications (1)

Publication Number Publication Date
JPH07177551A true JPH07177551A (en) 1995-07-14

Family

ID=18134399

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5321605A Pending JPH07177551A (en) 1993-12-21 1993-12-21 Voice information transmission and reception method in radio selective calling

Country Status (1)

Country Link
JP (1) JPH07177551A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007096409A (en) * 2005-09-27 2007-04-12 Hitachi Kokusai Electric Inc Wireless communication system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61224699A (en) * 1985-03-29 1986-10-06 Nec Corp Paging exchange system
JPH03198440A (en) * 1989-12-27 1991-08-29 Casio Comput Co Ltd Paging receiver with message receiving function

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61224699A (en) * 1985-03-29 1986-10-06 Nec Corp Paging exchange system
JPH03198440A (en) * 1989-12-27 1991-08-29 Casio Comput Co Ltd Paging receiver with message receiving function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007096409A (en) * 2005-09-27 2007-04-12 Hitachi Kokusai Electric Inc Wireless communication system

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