`
`(I 9) Japan Patent Office (JP)
`
`(l 1) Japanese Unexamined Patent
`Application Publication Number
`
`(12) Japanese Unexamined Patent
`
`Application Publication (A)
`Identification codes
`.lPO filenumberi
`7608-SK
`103 A
`
`(51) Int. Cl?
`H 04 B 7/26
`
`H2-213237
`
`(43) Publication date: 24 Aug 1990
`
`(54) Title of the invention
`
`MESSAGE TRANSMISSION SYSTEM
`
`Request of examination: None Number of claims: I
`
`(Total of 5 pages)
`
`(72) Inventor
`
`(72) Inventor
`
`(2l) Application No.: JP H1-32879 A
`(22) Date of Application: I4 Feb 1989
`Akifumi Akiyama
`
`Fumiaki Ishino
`
`(72) Inventor
`
`Hidco Sckiguchi
`
`(71) Applicant
`(74) Agent
`
`NTT Corp.
`Keiichi Yamamoto, patent attomey
`
`Specification
`I. Title ofthc Invention
`2. Claims
`
`1
`
`A message transmission system comprising a
`mobile terminal, a wireless base station, and a control
`station, using one-way wireless communication lines
`that transmit data from the control station to the
`mobile terminal via the wireless base station, wherein
`the data transmitted from the control station is
`divided into a plurality of frames, a mobile terminal
`number, a data number, and a frame number are
`attached to each frame before being transmitted, and
`transmitted frames are held by the control station for a
`fixed amount of time,
`the mobile terminal checks whether or not the
`frames were able to be received without error, and, ifa
`frame with an error is identified, stores the data
`number and the frame number thereof, and visibly
`displays the data number and the frame number in the
`mobile terminal,
`a mobile terminal owner electrically or
`acoustically couples the mobile terminal to a general
`telephone network to transmit to the control station the
`mobile terminal number, the data number, and the
`number ofthc frame where the error occurred,
`the control terminal retransmits only the mobile
`terminal number, the data number, and the en'or frame
`number, and
`
`% NTT Corp. l-1-6 Uchisaiwai—cho, Chiyoda-ku.
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`% NTT Corp.
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`
`l—l-6 Uchisaiwai—cho, Chiyoda-ku,
`
`'~/o NTT Corp. 1-1-6 Uchisaiwai—cho, Chiyoda-ku.
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`
`the mobile terminal visibly displays the data of the
`frames which were initially correctly received and of
`the retransmitted frame in frame number order.
`3. Detailed Description ofthe Invention
`(Industrial Field of Use)
`The present invention relates to a one-way
`mobile wireless data communication system such as a
`display—type beeper, wherein data is retransmitted
`when received data is incorrect.
`(Prior Art)
`Conventionally, in one-way mobile wireless data
`communication systems, advanced error correction
`functionality has been added to signals or identical
`signals have been transmitted multiple times to
`improve signal reliability. However, these methods
`involve transmitting data that is several times the
`length of the actually required data length even when
`there are no problems in the wireless communication
`line, wasting valuable wireless bandwidth. The waste
`is particularly egregious when transmitting identical
`signals multiple times in cases where long pieces of
`data are transmitted, such as with display-type
`beepers. Moreover, mobile communication sometimes
`involves moving to locations with extremely poor
`wireless communication line transmission quality,
`such as inside elevators or tunnels, normally
`necessitating multiple transmissions even when an
`advanced error correction symbol is used.
`(Problem to be Solved by the Invention)
`
`1
`
`GOOGLE 1004
`
`
`
`The present invention has as an object to provide
`a message transmission system that eliminates the
`waste of retransmission.
`
`(Means for Solving the Problem)
`A feature ofthe present invention for attaining
`this object is a message transmission system
`comprising a mobile terminal, a wireless base station,
`and a control station, using one-way wireless
`communication lines that transmit data from the
`control station to the mobile terminal via the wireless
`base station, wherein the data transmitted from the
`control station is divided into a plurality of frames, a
`mobile terminal number, a data number, and a frame
`number are attached to each frame before being
`transmitted, and transmitted frames are held by the
`control station for a fixed amount oftime, the mobile
`terminal checks whether or not the frames were able to
`be received without error. and, ifa frame with an error
`is identified, stores the data number and the frame
`number thereof, and visibly displays the data number
`and the frame number in the mobile terminal, a mobile
`terminal holder electrically or acoustically couples the
`mobile tenninal to a general telephone network to
`transmit to the control station the mobile terminal
`number, the data number, and the number ofthe frame
`where the error occurred, the control terminal
`retransmits only the mobile terminal number, the data
`number, and the error frame number, and the mobile
`terminal visibly displays the data ofthe frames which
`were initially correctly received and ofthe
`retransmitted frame in frame number order.
`The present invention divides data transmitted to
`a mobile terminal into aplurality of frames, adds a
`mobile terminal number, a data number, and a frame
`number to each frame before transmission, and
`displays the data number and the frame number of an
`incorrect frame in the mobile terminal, and a mobile
`terminal owner transmits the data number and the
`
`frame number of this incorrect frame over a general
`telephone line to a control station. The control station
`holds downlink data for a fixed amount oftime and
`then retransmits only the data numbers and the frame
`numbers ofthe incorrect frames to the mobile
`
`terminal. Furthermore, ifa configuration is used in
`which the mobile terminal transmits numbers which
`
`must be transmitted to the control station, being a
`control station access number, the mobile terminal
`number, the incorrect data number, and the frame
`‘number, from the mobile terminal to a general
`telephone network automatically via acoustic coupling
`or electromagnetic coupling, transmission ofthese
`numbers to the control station becomes very easy.
`
`JP H2—213237 (2)
`
`4
`
`In this manner, when the wireless communication
`line quality is good, data is only sent once from the
`control station, and when retransmitting, only
`incorrect frames are retransmitted, which is very
`advantageous in terms of efficient use of wireless
`frequencies.
`(Embodiments)
`FIG.
`I
`is one embodiment ofthe present
`invention, in which 101 is a mobile terminal, 102 is a
`base station, 103 is a control station, 104 and 105 are
`exchanges in a general telephone network, 106 is
`memory, 107 is a data terminal, and 108 is a
`telephone.
`FIG. 2 shows a frame format ofa signal that the
`control station 103 transmits to the mobile station 101
`
`from the base station 102. 201 is a synchronization
`signal, 202 is a mobile terminal number, 203 is a data
`number, 204 is a frame number, 205 is data, and 206 is
`an error correction detection code.
`
`FIG. 3 is a clock diagram of the mobile terminal,
`in which 301 is a wireless section, 302 is a control
`section, 303 is memory, 304 is a display section, 305
`is a PB signal generation section, 306 is a speaker, and
`307 is keys.
`FIG. 4 is a control flow in the mobile terminal. A
`user wishing to transmit data to the mobile station 101
`first dials an access number to the control station 103
`
`from the data terminal 107 using a general telephone
`line. The exchange 105 extends a communication line
`to the exchange 104 and is connected to the control
`station 103. A reception tone is transmitted to the data
`terminal 107 from the control station 103, and a
`mobile terminal number that is to be called and data
`
`are transmitted from the data terminal 107. Having
`received these, the control station 103 looks at the
`length of the received data and ifit is larger than an
`amount the control station 103 can transmit at one
`time, the control station 103 divides the received data
`into a plurality ofinstances of data and transmits this
`over a wireless communication line. FIG. 2 shows a
`transmission frame format. Each frame comprises the
`synchronization signal 201 for establishing frame
`synchronization and bit synchronization, the mobile
`terminal number 202 from which data is to be
`received, the data number 203 that is to be sent, a
`frame number 204 ofthe divided data, the divided data
`205, and an error correction detection code 206. The
`control station outputs these data and stores the data
`that has been transmitted, the mobile terminal number,
`the data number, the frame number, and the
`transmitted data in the memory 106. The transmission
`data is sent from the base station 102 to the mobile
`station 101 over the wireless communication line. In
`the mobile station 101, the wireless section 301 in
`
`50
`
`2
`
`
`
`FIG. 3 performs reception and demodulation (400
`in FIG. 4), and the control section 302 corrects any
`errors
`
`i
`
`using the error correction detection code 206
`(402). If it is found that there are no errors, the data
`number 203, the frame number 204, and the data 205 ‘
`are stored in the memory 303 (404). lfthere are errors,
`a symbol is attached indicating that there is an error.
`and this is similarly stored in the memory 303, Once
`all the frames in one data number have been received,
`the control section 302 emits a ring tone (408) as
`needed, and displays the data to the display section
`304 (410). Whether all the frames have been received
`or not can easily be established by including a number
`indicating an order of frames and how many frames
`have been transmitted in the frame number. If there
`
`are any frames that contain errors in the display data.
`the fact that there is an error is also displayed. For the
`error display, several methods are conceivable,
`including displaying everything including the
`incorrect data, and causing the frames with incorrect
`data to blink, indicating through writing or the like
`that there are incorrect frames without displaying the
`data, and so on. The mobile terminal owner sees these
`displays and if he or she desires to receive correct
`data, he or she goes to a nearby telephone 108 as in
`FIG. 1, and ifthe telephone is a PB telephone, the
`mobile terminal owner picks up the handset and
`checks for a dial tone, and then places the speaker
`section 306 ofthe mobile terminal 101 against a
`mouthpiece ofthe telephone and presses a connection
`key ofthe keys 307 (416). The control section 302
`reads a connection telephone number to the control
`station 103 in FIG. 1 from the memory 303, drives the
`PB signal generation section 305, and transmits the
`telephone number as a dial signal through the speaker
`306 (418). The exchange 105 receives this signal, and
`causes the control station 103 to receive it via the
`
`exchange 104. The control station 103 responds to the
`call and transmits a talkie or a second dial tone. Upon
`hearing this, the mobile terminal owner presses the
`data transmission key in the keys 307 (420), upon
`which the control section 302 reads the data number,
`the flame number, and its own mobile terminal
`number for the data that is experiencing the error from
`the memory 303, drives the PB signal generation
`section 305, and transmits the data through the speaker
`306 (422). Ifthere are a plurality of frames with
`errors, a plurality of frame numbers are transmitted. If
`the frame number(s) could not be received, then
`naturally the missing frame number(s) are transmitted.
`Upon receiving this signal, the control station 103
`searches the content of the memory 106 on the basis of
`the mobile terminal number. the data number, and the
`
`—203——
`
`JP I-I2-213237 (3)
`
`frame number that have been received, and then
`retransmits the incorrect frame to the mobile terminal
`101 via the base station 102 and the wireless
`communication line. The mobile terminal 101 secs
`from the data number that this data is a retransmission
`
`of previously received data, and stores the newly
`received data in a memory area for already-stored data
`numbers. If there are frames with errors after error
`
`correction and detection, the display indicates that
`there are errors, as during the first reception, and
`requests retransmission again through the telephone if
`needed. Ifit is seen that all the frames were able to be
`received without errors after error correction, then this
`is displayed to the display section 304 to notify the
`mobile terminal owner.
`
`Ifthe telephone 108 is not 21 PB telephone, the
`mobile terminal 101 is connected to the mouthpiece of
`the telephone 108, then no connection can be
`established with the control station 103 even ifthe
`connection key ofthe keys 307 is pressed and the PB
`signal is transmitted through the speaker 306. In this
`case, the mobile terminal owner must manually dial
`the connection number for the control station 103 from
`the dial ofthe telephone 108 and connect to the
`control station 103 using a DP signal. Next, the mobile
`terminal owner hears the talkie or the second dial tone
`from the control station and connects the mobile
`
`terminal 101 to the mouthpiece of the telephone 108
`and presses a data transmission key ofthe keys 307, at
`which the control section 302 the frame number with
`
`the error can be extracted from the memory 303 and
`transmitted together with the data number, the mobile
`terminal number, and the PB signal through the
`speaker 306. In this manner, the dialing is done
`manually at first, but there is no need to input the data
`number and so on manually, so data entry is extremely
`simple. FIG. 4 shows a control flow ofthe mobile
`terminal.
`
`In the above description, a method was described
`in which a mobile terminal owner acoustically couples
`[1 mobile terminal to a telephone and automatically
`transmits a data number, frame number, and a mobile
`terminal number with an error, but it is also possible to
`provide a special terminal to the telephone and
`transmit the data electromagnetically, instead of using
`acoustic coupling. Moreover, it is also naturally
`possible to display the mobile terminal number, the
`data number, and the incorrect frame number to the
`terminal for the mobile terminal owner to enter
`manually through a PB telephone, instead of automatic
`transmission.
`
`3
`
`
`
`JP H2-213237 (4)
`
`8
`
`simply by operating keys on the mobile terminal. This
`provides the effect of making it possible to make a
`retransmission request using an extremely simple
`operation. Moreover, by transmitting only the mobile
`terminal number and all the frames, the reliability of
`the system can be improved even more.
`l. Brief Description of the Drawings
`FIG. 1
`is one embodiment ofthe present invention.
`FIG. 2 is a frame format of a signal that is transmitted
`to a mobile terminal lO1 from a base station 102 by a
`control station 103.
`
`FIG. 3 is a block diagram ofa mobile terminal.
`FIG. 4 is a control flow ofthe mobile terminal
`
`15
`
`20
`
`describing operation ofthe present invention.
`l0l
`mobile terminal, 102
`base station,
`l03
`control station, 104, 105
`exchanges in a
`general telephone network,
`106
`memory, 107
`data terminal,
`lO8
`telephone, 201
`synchronization signal,
`202
`mobile terminal number, 203
`data signal,
`204
`frame number, 205
`data
`206
`error correction detection code, 303
`memory,
`
`304
`section,
`306
`
`display section, 305
`
`PB signal generation
`
`speaker, 307
`
`key.
`
`Patent Applicant
`NTT Corp.
`Patent Application Agent
`Keiichi Yamamoto, patent attorney
`
`With this system, ifthe transmission frame is
`divided into several pieces, all of the frames included
`in the mobile terminal number, the data number, and
`the frame number are transmitted several times, and
`therefore ifany ofthose are received by the mobile
`terminal the data is transmitted to the mobile terminal,
`making it possible to know how many frames were not
`delivered and making it easy to perform a
`retransmission request. llowever, ifthe transmission
`data is a single fi'ame or there are only a few frames,
`the mobile terminal number and so on are transmitted
`once or only a few times, and ifthere are errors
`therein, it would be impossible even to know that data
`was transmitted to the mobile terminal, making it
`impossible to request retransmission. To avoid this, a
`method is conceivable in which only the mobile
`terminal number, the data number, and all the frames
`are transmitted multiple times at first, as with existing
`beepers. Thus ifthe wireless communication line is
`good, waste does arise because ofthe multiple
`transmissions, but in general these numbers and digits
`are shorter than the data that is transmitted, and
`therefore the usage efficiency ofthe wireless
`communication line drops almost not at all, even if
`transmission is repeated several times.
`(Effects ofthe Invention)
`As discussed above, with the present invention, in
`a communication system in which there is a one-
`way wireless communication line, such as with a
`beeper provided with a display, ordinarily
`communication can be performed without multiple
`data transmissions, which is extremely desirable in
`terms of efficient usage of wireless communication
`lines. incorrect frame numbers are transmitted over a
`telephone line, but retransmitted data from a control
`station uses wireless communication lines, meaning no
`new receiver is needed for the mobile terminal,
`allowing economical retransmission. Moreover, when
`a frame number that has an error is transmitted to the
`
`control station using a general telephone line, the
`mobile terminal is coupled with a telephone using
`acoustic coupling or the like, allowing transmission of
`incorrect frame numbers and the like using a PE signal
`
`4
`
`
`
`.
`
`.
`
`101:MobileTerminal
`
`JP H2—213237 (5)
`
`105
`{
`
`at
`
`: Data terminal
`
`Base
`
`Control
`
`I-'°8:Telephonc
`8
`
`Embodiment ofthe present invention
`
`201 zsync Signal
`263: Dina Signal
`
`'
`
`206 Error correction
`detection code
`
`:Mobile terminal
`number
`
`j
`mdgrramc number
`
`Signal frame format
`
`FIG. 2
`
`Display section
`
`PB signal
`jgeneration section
`
`Block diagram of mobile terminal
`
`FIG. 3
`
`5
`
`
`
`JP H2-213237 (5)
`
`Receive mobile terminal 110., data
`
`-1
`~ -
`~
`- - ».
`.
`Error correction, detection
`
`Store in memory
`
`Error framesi;
`
`I‘
`
` w
`
`.
`.m0n-ri‘ection key pressed? 5,
`
`>
`
`(ForPBtlhone‘)
`
`Send connection no. using PB signal
`
`'
`
`414
`
`(For DP telephone)
`
`Data transmission key pressed?
`
`'
`
`Transmit error data number, frame number,
`mobile terminal number, etc., using PB signal
`
`Operation flow ofmobile terminal
`
`6
`
`
`
`PARK
`
`IP TRANSLATIONS
`
`Certification
`
`Park lP Translations
`
`TRAN$LATOR'S DECLARATION:
`
`1, Marc Adler, hereby declare:
`
`That I possess advanced knowledge of the Japanese and English languages.
`The attached Japanese into English translation of Japanese Unexamined Patent
`Application Publication H2-213237 (“Akiyama") has been translated by me and
`to the best of my knowledge and belief, it is a true and accurate translation of
`the publication.
`
`All statements made of my own knowledge are true and all statements made
`on information and belief are believed to be true.
`I further declare that these
`
`statements were made with the knowledge that willful false statements and the
`like so made are punishable by fine or imprisonment, or both, under Section
`1001 of the Title 18 of the United States Code and that such willful false
`statements may jeopardize the validity of this proceeding.
`
`Dated:
`
`12/15" /Z/Oz
`
`By:
`
`Marc Adler
`
`Project Number: PKC_1604__016
`
`15 W. 37*“ Street 8'“ Floor
`New York, NY 10018
`212.581.8870
`ParklP.com
`
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