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`

`GREGOR HARTMANN
`JAPANESE-ENGLISH TRANSLATION
`157 OAK STREET
`RIDGEWOOD, NEW JERSEY 07450-2508
`Voice; 201-220-6785 emgil; g.b3rtm9nn@9tt.net
`
`TRANSLATION from Japanese to English
`
`C E R T I F I C A TE OF T R A N S L A T I ON A C C U R A CY
`
`This day personally appeared before me Gregor Hartmann, who after being duly sworn
`deposes and states;
`
`that he is a translator of the Japanese and English languages, a professional provider of
`translations, accredited by the American Translators Association (Alexandria, VA) for
`Japanese to English translation;
`
`that he is thoroughly familiar with these languages and has carefully made and verified
`the attached translation from the original document in the Japanese language, to wit:
`
`JP2-145030A (Sugita)
`Mobile Object Communication System
`
`and that the attached translation is a true and correct English version of the original to
`the best of his knowledge and belief.
`
`Sworn to before me
`
`this date:
`
`Gregor Hartmann, Translator
`
`OFFICIAL SEAL
`GIUSEPPINA PALACIO
`NOTART PUBLIC - STATE OF NEW JERSh
`My Commission Expires Aug. 23, 2017
`
`Kyocera PX 1024_6
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`

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`
`
`
`
`
`(19) Japan Patent Office (JP)
`
`
`(12) Laid-open Patent Application Gazette (A)
`
`(11) Laid-open Patent Application No. H2-145030
`(43) Date of Laid-open Publication: June 4, 1990
`
`Agency Control No.
` 7608-5K
` 6945-5K
` 6945-5K
`
`ID Code
` N
` 311 T
` L
`
`(51) Int. Cl. 5
` H 04 B 7/26
` H 04 Q 9/00
` 9/14
`
`
`Examination: Not Requested Yet No. of Claims: 1 (Total 5 pages)
`
`
`(54) Title of Invention: Mobile Object Communication System
`
`(21) Application No.: Patent Application S63-299932
`
`(22) Filing Date: November 28, 1988
`(72)
`Inventor: Takehiro SUGITA, c/o Sony Corp., 6-7-35 Kitashinagawa, Shinagawa-ku,
`Tokyo
`(71) Applicant: Sony Corp., 6-7-35 Kitashinagawa, Shinagawa-ku, Tokyo
`(74) Agent: Hidemori MATSUKUMA, Patent Agent
`
`
`
`
`SPECIFICATION
`
`TITLE OF INVENTION:
`
`Mobile Object Communication System
`
`WHAT IS CLAIMED IS:
`
`A mobile object communication system in which a message, transmitted from a
`communication center at a predetermined time interval, is received at the mobile object side,
`wherein:
`
`time information is inserted in said message at said communication center at a
`predetermined time and transmitted, and
`
`a clock at said mobile object side is calibrated using this time information, and a
`reception means at said mobile object side is made active during the predetermined time band in
`which the message to be received at the mobile object side is next transmitted.
`
`DETAILED DESCRIPTION OF THE INVENTION
`Industrial Field of Application
`
`The present invention pertains to a mobile object communication system.
`
`Summary of the Invention
`
`The present invention is a mobile object communication system in which a message,
`transmitted from a communication center at a predetermined time interval, is received at the
`mobile object side, wherein a clock at the mobile object side is calibrated using time information
`
`
`
`1
`
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`inserted in the message at a predetermined time at the communication center, and the receiver at
`the mobile object side is made inactive until the predetermined time band when the message to
`be received next at the mobile object side is transmitted, thereby reducing power consumption at
`the mobile object side.
`
`Prior Art
`
`Hitherto, a wireless communication system connecting a base station and a plurality of
`mobile stations via a geostationary artificial satellite has been configured or proposed.
`
`In this sort of wireless communication system, as shown in FIG. 4, for example, a
`downlink circuit from a base station CS to a plurality of mobile stations M11 through Mmn is
`configured via a satellite STd, and an uplink circuit from the mobile stations M11 through Mmn to
`the base station CS is configured via a satellite STu. The frequencies used by the uplink circuit
`and the downlink circuit are respectively 1.6 GHz and 4 GHz, for example. A user HQ such as a
`transportation company, for example, and the base station CS are connected by a separate
`communication circuit L.
`
`
`Problems the Invention Is to Solve
`
`Incidentally, in a communication system of the type described above, information from
`the base station CS to the plurality of mobile stations M11 through Mmn is sequentially
`transmitted, so each individual mobile station does not always have to be standing by in
`reception state. Accordingly, one could contemplate reducing power consumption by having
`stations at the mobile object side intermittently be in the reception state, according to the
`respective clocks (timers), only during a predetermined time band when a self-addressed
`designated message is transmitted. In particular, if a mobile station is mounted in an automobile
`and the engine thereof is halted, this conserved electricity is effective in reducing the load on the
`battery.
`
`However, the environmental conditions in which a mobile station operates are harsh, and
`extend across the temperature range from -40° to +70°C, for example, and it is possible for a
`timer to deviate by one minute or more in one day. If this situation is not addressed, the deviation
`for each day accumulates, and the intermittent reception period according to the timer and the
`transmission period for the designated message become partially out of sync, and it may not be
`possible to completely receive the designated message.
`
`Also, if the mobile station operator calibrates the timer to the correct time immediately
`before use, timer deviation can be eliminated, but this is a rather troublesome task, and there
`remains the problem of losing reliability due to negligence or error.
`
`In light of such issues, the object of the present invention is to provide a mobile object
`communication system that reliably performs intermittent reception in a predetermined period
`and reduces power consumption at the mobile object side.
`
`Means for Solving the Problems
`
`The present invention is a mobile object communication system in which a message,
`transmitted from a communication center at a predetermined time interval, is received at the
`mobile object side, wherein time information is inserted in the message at the communication
`center at a predetermined time and transmitted, and a clock at the mobile object side is calibrated
`using this time information, and a reception means at the mobile object side is made active
`
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`2
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`Kyocera PX 1024_8
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`

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`during the predetermined time band in which the message to be received at the mobile object
`side is next transmitted.
`
`Operation
`
`According to the present invention, the receiver is made inactive at times other than the
`predetermined time band when a message to be received at the mobile object side is transmitted,
`thereby reducing power consumption at the mobile object side.
`
`Embodiment
`
`Below, one embodiment of a mobile object communication system in accordance with
`the present invention shall be described while referring to FIG. 1 through FIG. 3.
`
`FIG. 1 shows the configuration of the main parts of one embodiment of the present
`invention.
`
`In FIG. 1, (11) is a receiver, and includes a demodulator (12); it is supplied with a 4 GHz
`reception signal induced in an antenna (13). Also, power at about 12V and 0.5A, for example, is
`supplied from a battery (1) via a switch (14).
`
`(20) is a computer serving as a communication terminal device; it is supplied with the
`demodulated output of the receiver (11). The computer (20) is provided with a designated
`message extraction circuit (21), a clock calibration message extraction circuit (22), and a clock
`(23); a self-addressed designated message and a clock calibration message are respectively
`extracted by the two extraction circuits (21) and (22). A control signal is supplied to the clock
`(23) on the basis of the calibration message from the extraction circuit (22), and the switch (14)
`is opened or closed according to the clock (23).
`
`Various functions of the computer (20) are controlled and messages from the mobile
`station to the communication center CS (see FIG. 4) are inputted using a keyboard (24). These
`messages are displayed at the screen of the display (25) in the same manner as the received
`designated message.
`
`Furthermore, the computer (20) is always connected to the battery (1).
`
`A message from the communication terminal (20) is supplied to the modulator (32) of a
`transmitter (31), and transmitted from an antenna (33) in a predetermined format. The transmitter
`(31) is connected to the battery (1) via a switch (34); this switch (34) is closed only when
`transmitting.
`
`Next, the intermittent receiving action of the FIG. 1 embodiment shall be described while
`referring to FIG. 2 and FIG. 3.
`
`In this embodiment, in order to transmit data reliably, a transmission control procedure
`(protocol) is used that conforms to an international-standard high level data link control
`procedure (High level Data Link Control procedure) that is suitable for high-speed circuits.
`
`HDLC is capable of transmitting bit-unit optional patterns; if there is no response to a
`transmission-unit frame, continuously sending a plurality thereof is postponed.
`
`As shown in FIG. 3, before and after a frame there is a specific 8-bit flag which becomes
`"7E" in hexadecimal notation. A CRC-type 16-bit frame check sequence (Frame Check
`Sequence) is provided at the end of a frame for error control. In this embodiment, the amount of
`data in a message is variable. A single packet, from flag to FCS, can be a maximum of 127 bytes
`(1016 bits), and is transmitted at a rate of 1200 bps.
`
`The address of the mobile station to receive the message is provided after the flag. This
`address can be expanded to 16 bits, as shown in FIG. 3A, for the individual mobile stations.
`
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`3
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`Kyocera PX 1024_9
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`

`

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`Also, a special global address like the one shown in FIG. 3B, for example, is used for all of the
`mobile stations in the system.
`
`In this embodiment, a clock calibration message is transmitted to all mobile stations using
`this global address every hour on the hour, for example. Then, each mobile station calibrates its
`clock based on this calibration message, as shown in FIG. 2, and intermittently receives its self-
`addressed designated message in a reliable manner.
`
`In the initial state of intermittent reception, the switch (14), which supplies power to the
`receiver (11) of the mobile station, is off.
`
`First, it is determined if clock matching has been completed (step ). If matching has
`been completed, the timing for turning on the switch (14) is calculated based on the clock (23)'s
`current time and the predetermined transmission start time of the calibration message or the
`designated message (step ). In this state, [the mobile station] waits until the time to receive the
`calibration message or the designated message (steps , ). If matching has not been
`completed, the clock matching of step , to be described later, is executed, and then the flow
`returns to step .
`
`In step , when the clock (23) reaches the time to receive the calibration message (for
`example, one minute before every hour on the hour), the clock matching of step  is executed.
`
`Specifically, the switch (14) is turned on (step <11>), the receiver (11) is activated, the
`calibration message is received (step <12>), and the clock (23) is calibrated on the basis of this
`message (step <13>). Then the switch (14) is turned off (step <14>), and the flow returns to step
` again.
`
`In step , when the clock (23) reaches the time to receive the designated message (for
`example, one minute before the predetermined transmission starts), the switch (14) is turned on
`(step ), the receiver (11) is activated, the designated message is received (step ), and when
`receiving the designated message ends, the switch (14) is turned off (step ), and the flow
`returns to step .
`
`Subsequently, the same actions are repeated.
`
`In this example, the calibration message is transmitted only once per hour, for example,
`so the resulting increase in the transmitted information amount can be ignored, which is suitable
`for cases in which the circuit capacity is small.
`
`Effect of the Invention
`
`As described in detail above, according to the present invention, the clock at the mobile
`object side is calibrated using time information inserted at a predetermined time in a message
`transmitted at a predetermined time interval from the communication center, and the receiver at
`the mobile object side is made inactive until the predetermined time band when the next message
`to be received at the mobile object side is transmitted, thereby providing a mobile object
`communication system in which power consumption at the mobile object side is reduced.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is a block diagram showing the configuration of the main parts of one embodiment
`of a mobile object communication system in accordance with the present invention. FIG. 2 is a
`flowchart showing the intermittent reception action of the main parts of one embodiment of the
`present invention. FIG. 3 is a conceptual diagram showing the configuration of information
`transmitted in one embodiment of the present invention. FIG. 4 is a conceptual diagram for
`describing the present invention.
`
`
`
`4
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`Kyocera PX 1024_10
`
`

`

`
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`(1) is a battery, (11) is a receiver, (14) is a switch, (20) is a communication terminal
`
`(computer), (21) is a designated message extraction circuit, (22) is a clock calibration message
`extraction circuit, (23) is a clock, CS is a communication center, and M11 through Mmn are
`mobile objects.
`
`Agent: Tadashi ITO
` ʺ Hidemori MATSUKUMA
`
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`Kyocera PX 1024_11
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`Kyocera PX 1024_12
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