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`
`U8006374080132
`
`United States Patent
`
`(12)
`(10) Patent N0.:
`US 6,374,080 B2
`
`Uchida
`(45) Date of Patent:
`Apr. 16, 2002
`
`(S4) MOBILE COMMUNICATION SYS’I‘EM
`
`(75)
`
`Inventor: Yosliinori Uehida, Tokyo (JP)
`
`JP
`.Il’
`JP
`JP
`
`59-6642
`21—13006]
`6338349
`Tut—75344
`
`lt1984
`5,!1993
`1251994
`8.31995
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`(-1) APPI- “0" "937545103
`(22
`Filed:
`Jan. 5, 2001
`
`OTHER PUBLICMIONS
`Radiocommunication Stud)r Groups, Doc. 4—QSFTEMI’i
`3(I(Rev.])—E,
`Inter. Telecommunications Union, Jan. 13,
`.
`.
`1997’ m" 1‘25‘
`I-lase, Yoshihtro, et al., "A Novel Broadbaan Access Net—
`work Using Stratospheric Wireless Communication Flat-
`forms”, ’l‘eehnieal Report of once, ss‘1'97—93, Sep. 1997.
`PP- 754%). 'l‘okyo. Japan-
`
`Related U.S. Application Data
`
`* oiled by examiner
`
`‘
`:3”an Examiner-Tracy If:ng
`(74) Anni-mil) Agent, or Ftrm—Rothwcll, Flgg, Ernst &
`“'3”ka
`(5?)
`
`ABSTRACT
`‘
`_
`_
`_
`In cases where a radio communication 15 performed between
`a ground radio base station and a subscriber station, when a
`delay time J passes after the transmission of a radio wave
`from the ground radio base station to a stratospheric plat-
`form base station, another radio wave relating to the saint:
`information as that indicated by the radio wave is transmit—
`led from the ground radio base station to the subscriber
`station. ‘t'hereforc, in the subscriber station, a phase of the
`radio wave directly transmitted from the ground radio base
`station is synchronized with a phase of the radio wave
`.P If
`h,
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`'ransmn“. For“ ‘J 13’0"“ “‘30 “'5‘ 51311?“
`rout:
`"
`stratospheric platform base station. Accordingly.
`the sub—
`scribcr station can change over from one radio Wave, of
`which the strength is weakened, to another radio wave.
`
`15 Claims, 10 Drawing Sheets
`
`
`
`(63) Continuation of application No. PC‘I‘i’Il’LJ‘JrTBZ‘ifi, tiled on
`Jun. 17. 1999.
`Int. C1,?
`
`(51)
`
`H0413 7:185; Hth Tim;
`1-1040 7720
`45313.1; 455,602; 4553616;
`(52) U.S. Cl.
`455E426. 45.3552. 455F448. 4553-440. “will
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`’ ‘
`‘
`References Cited
`U.S. PATENT DOCUMENTS
`
`(‘58) Field
`‘
`
`(56)
`
`455i'13.l
`I.inquistelal.
`8.!1993
`5,239,671 A “
`455420
`$1999 Nitta ct al.
`5,950,127f A *
`
`455E552
`“mm Murata
`6‘181952 m a:
`455i432 x
`6',25r;,4tn Bl
`* moot Chambers
`FOREIGN PATENT DOCUMENTS
`
`JP
`
`58—131842
`
`8f1983
`
`
`
`STR ATOS N [E R
`
`
`
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`MOBlLL‘,
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`10
`
`PETITIONERS 1064-0001
`
`|PR2016-OO75
`
`PETITIONERS 1064-0001
`IPR2016-00758
`
`

`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 1 0f 10
`
`US 6,374,080 B2
`
`FIG.1
`
`STRATOSPHERIC PLATFORM
`
`ll
`
`10
`
`
`
`PETITIONERS 1064-0002
`
`|PR2016—OO75
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`MOBILE
`SWITCHING
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`CENTER
`
`
`
`PETITIONERS 1064-0002
`IPR2016-00758
`
`

`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 2 0f 10
`
`US 6,374,080 B2
`
`FIG.2
`
`GROUND RADIO BASE STATION
`
`2]
`
`FOR—HAPS
`INFORMATION
`PROCESSING UNIT
`
`
`
`UNIT MOBILE SWITCHING
`
`FOR-MS
`
`INFORMATION
`PROCESSING UNIT
`
`I DELAY
`
`CONTROL
`
`CENTER
`
`PETITIONERS 1064-000
`
`|PR2016—OO75
`
`PETITIONERS 1064-0003
`IPR2016-00758
`
`

`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 3 0f 10
`
`US 6,374,080 B2
`
`“MET
`
`FIG.3
`
`HIGH-SPEED TD-CDMA
`FOR PCS #21322
`
`#22 MEDIUM
`AA SPEED TDMA #25
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`DATA #244”
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`FOR PCS #21-2A
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`HIGH-SPEED 'I‘D-CDMA
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`#22
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`
`TD—CDMA TIME SLOT
`HIGIISPEED DATA
`TRANSFER TIME DIVIDED FOR LOW-SPEED
`CDMA 'I‘lME SLOT
`DA'I‘A AND AUDIO
`
`TIME SLOT FOR
`'i‘I)-CDMA
`CELLULAR
`
`FREQUENCY F
`
`(ASYMMETRIC DISPLAY FOR UPIDOWN-LINK OF TDD, NOTES: *#33 IS TOMA}
`
`PETITIONERS 1064-000
`
`|PR2016—OO75
`
`PETITIONERS 1064-0004
`IPR2016-00758
`
`

`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 4 0f 10
`
`US 6,374,080 B2
`
`FIG.4
`
`ONE FRAME LENGTH = 10 ms
`
`RADIO WAVE RADIATED FROM
`DIRECTIONAL ANTENNA 4 OF BS3
`
`A
`
`RADIO WAVE RECEIVED IN
`DIRECTIONAL ANTENNA 8 OF HAPS7
`
`13
`
`F
`
`G
`
`
`
`RADIO WAVE RECEIVED 1N
`ANTENNA 11 0F M810
`
`H
`
`RADIO WAVE RECEIVED IN
`ANTENNA 11 OF MSlO
`
`C
`
`D
`
`RADIO WAVE RADIATED FROM
`DIRECTIONAL ANTENNA 5 OF 1383
`
`E
`
`TIME T
`
`PETITIONERS 1064-000
`
`|PR2016—OO75
`
`PETITIONERS 1064-0005
`IPR2016-00758
`
`

`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 5 0f 10
`
`US 6,374,080 B2
`
`32
`
`FIGS
`
`FIRST TIME SLOT
`DETECTOR
`
`INFORMATION
`DETECTOR
`
`35
`
`
` 38
` 36
`DETECTOR 37
`
`DELAY TIME
`MEASURING UNIT
`
`SECOND TIME
`SLOT DETECTOR
`
`INFORMATION
`DETECTOR
`
`N-TH TIME SLOT
`
`INFORMATION
`DETECTOR
`
`
`
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`TIME
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`F112
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`F113
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`F114
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`FREQUENCY AXIS
`
`PETITIONERS 1064-000
`
`|PR2016—OO75
`
`PETITIONERS 1064-0006
`IPR2016-00758
`
`

`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 6 0f 10
`
`US 6,374,080 B2
`
`FIG.7
`
`
`
`STRATOSPHERIC PLATFORM
`
`40
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`[0
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`10
`
`PETITIONERS 1064-0007
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`|PR2016—OO75
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`PETITIONERS 1064-0007
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`IPR2016-00758
`
`
`

`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 8 0f 10
`
`US 6,374,080 B2
`
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`PETITIONERS 1064-0009
`IPR2016-00758
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`

`US. Patent
`
`Apr. 16, 2002
`
`Sheet 10 0f 10
`
`US 6,374,080 B2
`
`TIME T
`
`FIG.11
`
`HIGH-SPEED TD-CDMA
`
`#22
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`
`PETITIONERS 1064-0011
`
`|PR2016—OO75
`
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`PETITIONERS 1064-0011
`IPR2016-00758
`
`

`

`US 6,374,080 B2
`
`1
`MOBILE COMMUNICATION SYSTEM
`
`CROSS-REFERENCE TO THE RE! ATED
`APPLICATION
`
`
`
`This application is a continuation of International Appli—
`cation No. PCIYJP993'03239, whose International filing date
`is Jun. 17, 1999, the disclosures of which Application are
`incorporated by reference herein. The present application
`has not been published in English.
`
`BACKGROUND OF TIIE INVENTION
`
`1. Field of the Invention
`
`The present invention relates to a mobile communication
`system in which radio communication is performed between
`a ground radio base station and a subscriber station (for
`example, a fixed radio station, a semi—fixed radio station, a
`mobile station, a portable radio station and so on) by using
`a Time Division Multiple Access (TOMA) method, a Code
`Division Multiple Amesszime Division Duplex (CDMN
`TDD) method or a Time Divided CDMA method.
`2. Description of Related Art
`In a mobile communication system, communication of
`information is, for example, performed between a mobile
`station such as a mobile on-vehicle communication appara-
`tus or a mobile portable communication apparatus and a
`ground radio base station through a radio channel.
`A technique, in which a satellite is added to the mobile
`communication system to make the satellite function as a
`relay repeater, has been disclosed in the patent gazette:
`Publication of the Japanese Application No. H7-75344 of
`1995, the Published Unexamined Japanese Patent Applica-
`tion No. $58-13l842 of 1983, the Published Unexamined
`Japanese Patent Application No. 859-6642 of 1984 and the
`Published Unexamined Japanese Patent Application No.
`145430001 of 1993.
`
`10
`
`15
`
`so
`
`35
`
`However, the satellite functions only as a relay repeater,
`but the satellite has no function for adjusting the phase of a
`radio wave transmitted and received.
`
`4!)
`
`Because the conventional mobile communication system
`has the above described configuration, a satellite can be used
`as a relay repeater. However, because the satellite has no
`function for adjusting a phase of radio wave, a phase shift
`between a radio wave directly transmitted from a ground
`radio base station and a radio wave transmitted from the
`ground radio base station through the satellite is generated in
`a subscriber station. Therefore, even though a power of one
`of the radio waves is weakened, there is a problem that it is
`dillicult to hand over the other radio wave to the subscriber
`station.
`
`45
`
`50
`
`SUMMARY OF THE INVEN'I'ION
`
`invention is provided to solve the above _
`The present
`problems, and has an object of providing a mobile commu-
`nication system which can be used in cases where the radio
`waves are received in a subscriber station. At the same time,
`the present invention allows while changing over from either
`one of a radio wave directly transmitted from a ground radio
`base station and a radio wave transmitted from the ground
`radio base station through a satellite (a stratospheric plat-
`form base station) to the other in response to conditions of
`the radio waves.
`
`60
`
`In a mobile communication system according to the
`present invention, when a prescribed delay time passes alter
`the transmission of a radio wave to a stratospheric platform
`
`65
`
`2
`base station, another radio wave relating to the same infor-
`mation as that indicated by the radio wave is transmitted to
`a subscriber station.
`
`Therefore. a phase of a radio wave directly transmitted
`from a ground radio base station can be synchronized with
`a phase of a radio wave transmitted from the ground radio
`base station through the stratospheric platform base station.
`Accordingly, when one of the radio waves becomes
`weakened, it is possible to hand over the other radio wave
`to the subscriber station.
`
`In a mobile communication system according to the
`present invention, the subscriber station compares a phase of
`the radio wave transmitted from the ground radio base
`station with a phase of the radio wave transmitted from the
`stratospheric platform base station, the subscriber station
`transmits phase dilIerence information,
`the ground radio
`base station receives the phase dilTerence information from
`the subscriber station, and the ground radio base station
`adjusts the prescribed delay time.
`Therefore,
`the phase synchronization can be precisely
`performed, and communication turbulence in a hand-over
`operation can be suppressed.
`In a mobile communication system according to the
`present invention, the subscriber station has a plurality of
`phase detectors for respectively detecting phase difference
`information and transmits the pieces of phase difference
`information to a plurality of ground radio base stations.
`Therefore, even though the subscriber station moves to a
`zone of an adjacent ground radio base station during the
`communication, communication turbulence can be sup—
`pressed.
`In a mobile communication system according to the
`present invention, the subscriber station transmits the phase
`difference information in which one symbol
`length is a
`minimum unit.
`
`Therefore, the phase synchronization can be performed
`more minutely.
`In a mobile communication system according to the
`present invention, the subscriber station transmits the phase
`difference information in which one chip rate length is a
`minimum unit.
`
`Therefore, the phase synchronization can be performed
`mom minutely.
`In a mobile communication system according to the
`present invention, the ground radio base station compares a
`phase of the radio wave transmitted from the stratospheric
`platform base station with a phase of the radio wave trans-
`mitted to the subscriber station and adjusts the prescribed
`delay time according to a comparison result.
`Therefore,
`the phasr: synchronization can be precisely
`performed, and communication turbulence in a hand—over
`operation can be suppressed.
`Also, the phase synchronization can be performed more
`minutely.
`In a mobile communication system according to the
`present invention, the ground radio base station adjusts the
`prescribed delay time according to the comparison result in
`which one symbol length is a minimum unit.
`Therefore, the phase synchronization can be performed
`more minutely.
`In a mobile communication system according to the
`present invention, the ground radio base station adjusts the
`prescribed delay time according to the comparison result in
`which one chip rate length is a minimum unit.
`
`PETITIONERS 1064-0012
`
`|PR2016-OO75
`
`PETITIONERS 1064-0012
`IPR2016-00758
`
`

`

`US 6,374,080 B2
`
`4
`Therefore, a large number of pieces of high-speed data
`and pieces of low-speed data can be simultaneously trans-
`ferred.
`
`BRIEF DESCRlPTION OF THE DRAWINGS
`
`
`
`3
`Therefore, the phase synchronization can be performed
`more minutely.
`In a mobile communication system according to the
`present
`invention,
`the stratospheric platform base station
`receives the radio wave transmitted from the ground radio
`base station, measures a frame length of the radio wave.
`1 is a constitutional diagram showing a mobile
`FIG.
`compares the frame length with a standard frame length and
`communication system according to a first embodiment of
`adjusts a delay time extending from the reception of the
`the present invention;
`radio wave to the transferring of the radio wave according to
`FIG. 2 is a constitutional diagram showing a main portion
`.
`.
`a comparison result.
`Of a ground radm base 51mm“ 3;
`Therefore, even though the stratospheric platform base
`FIG. 3 is an explanatory diagram showing an example of
`station is moved by an air flow, phase synchronization can
`a time slot structure for a person communication system
`be performed,
`(PCS) aflqflccllPl§F SYSIcm accordingmihc TDMA “13th
`In a mobile communication system according to the
`present
`invention,
`the stratospheric platform base station 15 and lb“ Time DWld‘id CDMA memo“;
`receives the radio wave transmitted from the ground radio
`FIG. 4 is an explanatory diagram showing a delay time in
`base station, measures a multi-frame length of the radio
`information transfer of a down link which connect stations;
`wave: compares 1h“ muni'fi'amc length Will] a mandard
`FIG. 5 isaconstitutional diagram showingamain portion
`mUIIi'framc lenglh and 301111513 3 dclay lime “lending from
`ofa subscriber station 10 ofa mobile communication system
`‘hc'rcccl‘lion 0f the radio Wave it) [he 1"3331b"ng Of 111‘} 30 according to a second embodiment of the presont invention;
`will“ wave accordmg m a companson [milk
`FIG. 6 is an explanatory diagram showing a phase syn—
`Therefore, even though the stratospheric platform base
`chronmmm of a time 5101;
`:lauon lb moved by 'm a“ now’ phdse Synthmmimm Mm
`FIG. 7 is a constitutional diagram showing a mobile
`_
`e performed.
`-.
`-
`.
`.
`. ..
`-
`-
`.
`.
`.
`.
`communication system according to a fourth embodiment of
`In a mobile communication system according to the 35 [he
`regent inventiow
`.
`.
`.
`_
`.
`present
`invention,
`the stratospheric platform base station
`,1) ,
`i
`.
`’
`receives the radio wave transmitted from the ground radio
`“0‘ 8 LS an exPlanamfy magmm Erhowmg a “lam pom?“
`base station, measures a super-frame length of the radio
`or a Strilosljhcm planar”! pass Hanan 7 01 a. mOb'lc
`wave, compares the supepfmmc length with a standard
`communication system according to a fifth embodiment of
`super—frame length and adjusts a delay time extending from 3“ Ihc prcmnt_lnvcnum;_
`_
`y
`I
`_
`the reception of the radio wave to the transferring of the
`FIG
`'5_ a consmumnal _dlagram _5h0wmg 3_ mom“:
`radio wave according to a comparison msulL
`communication system according to a sixth embodiment of
`Therefore, even though the stratospheric platform base
`lhe Present lnvcnuon;
`station is moved by an air flow, phase synchronization can
`FIG. 10 is an explanatory diagram showing a main portion
`be performed,
`35 of the stratospheric platform base station 7 of a mobile
`In a mobfie wmmunicalion syslcm according 10 the
`communication system according to the sixth embodiment
`present
`invention,
`the stratospheric platform base station
`or [he Prat-3‘3“l mWnllD“ and
`adjusts a delay time for each of radio waves transmitted from
`FIG. 11 is an explanatory diagram showing an example of
`a plurality of ground radio base stations in cases where link
`a time slot structure for a person communication system
`channels are set between the stratospheric platform base 4” (PCS) and acellular system according to the TDMA method
`station and the plurality of ground radio base stations.
`and the Time Divided CDMA method.
`Therefore, even though one link channel is disconnected
`by an accident or natural conditions, a lack of information
`can be preventch
`In a mobile communication system according to the
`present
`invention,
`the stratospheric platform base station
`receives a plurality of radio waves transmitted from a
`EMBODIMENTI
`plurality of ground radio base stations,
`the stratospheric
`FIG‘ 1 is a constitutional diagram showing a mobile
`platform base station selects one of the radio waves, and the 50
`communication system according to a first embodiment of
`Stratospheric Platform has“: Stain" "395ch “1'3 Schema
`the present invention. In FIG. 1, 1 indicates a public switch—
`rad“) wave ‘0 [he “mum” 513m"-
`irig telephone network (PSTN). 2 indicates a mobile switch-
`'mcmfomi the 1'“din Wave received under superior 00H“
`cgnler, wirewonneclcd
`{he l’S‘l‘N 1‘ for C(xmrglljng
`diliUl‘lS can bf: transferred 10 the subscriber SIaIIOB.
`In a mobile communication system according to the 55 a ground radio base station 3. 3 indicates the ground radio
`present invention, 'I'DMA signals and time divided CDMA
`base station (BS), arranged on the ground, for performing a
`signals are included in time slots composing a frame to
`two-way communication of information with astratospheric
`construct the information to be transmitted.
`platform base station 7 and performing a two-way commu-
`Therefore. a large number of pieces of high-speed data
`nication of information with a subscriber station 10. 4
`and pieces of low—speed data can be simultaneously trans— 50 indicates a directional antenna for performing a radio com-
`ferred.
`munication with the stratospheric platform base station 7. 5
`In a mobile communication syslem according [0 this
`indicates an antenna for performinga radio communication
`present invention, one or more TDMA signals and one or
`With “10 SUbSCl‘ibCl‘ Slfllion 10-
`more time divided CIJMA signals are included in time slots,
`6 indicates a straIOSpbcn'c platform which is halted at an
`which are successively transferred along a time axis and are 65 elevation of about 20 km from the ground (automatically
`selected from a plurality of time slots composing a frame, to
`halted at a prescribed position while using a power of
`construct the information to be transmitted.
`propellers against a wind which is a low-density air flow)
`
`in
`
`4‘
`l
`
`DETAH':FTD DESCERIPTION 9F Til—IE
`[’REHLRRED bMBUDIMbNTb
`The invention will now be described with reference to the
`accompanying drawings.
`
`PETITIONERS 1064-001
`
`|PR2016-OO75
`
`PETITIONERS 1064-0013
`IPR2016-00758
`
`

`

`US 6,374,080 B2
`
`5
`and has a total length of about 200 m. The stratospheric
`platform 6 is made of a balloon on which a base station is
`mounted. 7 indicates the stratospheric platform base station
`(HAPS), set on the stratospheric platform 6, for performing
`a two—way communication of information with the ground
`radio base station 3 and performing a two»way communi—
`cation of information with the subscriber station 10. 8
`indicates a directional antenna for performing a radio
`communication with the ground radio base station 3. 9
`indicates an antenna for performing a rad io-commu nication
`with the subscriber station 10.
`10 indicates the subscriber station (MS) such as a fixed
`radio station, a semi-fixed radio station, a mobile station or
`a portable radio station. The subscriber station It] performs
`a two—way communication of information with the ground
`radio base station 3 and performs a two-way communication
`ofinformation with the stratospheric platform base station 7.
`11
`indicates an antenna for performing a
`radio-
`communication with the ground radio base station 3 or the
`stratospheric platform base station 7.
`FIG. 2 is a constitutional diagram showing a main portion
`of the ground radio base station 3. In FIG. 2, 21 indicates a
`for—HASP information processing unit for receiving infor—
`mation transmitted from the mobile switching center 2 and
`performing a prescribed processing to transmit the informa-
`tion to the stratospheric platform base station 7. 22 indicates
`a transmitter for convening the information output from the
`for-HASP information processing unit 21 into radio wave
`and outputting the radio wave. 23 indicates a lime setting
`unit for setting a delay time of the information 24 indicates
`a for-MS information processing unit for receiving the same
`information as that received in the for—HASP information
`processing unit 21 and performing a prescribed processing
`to transmit the information to the subscriber station 10. 25
`
`indicates a delay control unit for holding the information
`output from the for-MS information processing unit 24 by
`the delay time set in the time setting unit 23. 26 indicates a
`transmitter for convening the information output from the
`delay control unit 25 into radio wave and outputting the
`radio wave.
`
`It)
`
`15
`
`3o
`
`35
`
`4!)
`
`
`
`6
`according to the TDMA method and the Time Divided
`CDMA method.
`
`Contents shown in FIG. 3 are briefly desaribed. #21-0A to
`#21-5A, #21-08 and #21-1B indicate time divided (TDMA
`time slots for the person communication system (PCS)
`high-speed data transfer in first and second frames.
`#22—0A to #22—5A, #22—0B and #22~1B indicate time
`divided CDMA time slots for the PCS low-speed data
`transfer in the first and second frames.
`#23-1A to #23-5A and #23438 indicate TDMA time slots
`for the PCS low-speed data transfer in the first and second
`frames. #24-IIIA to #24-4A and #24-18 indicate TDMA time
`slots for the PCS middle—speed data transfer in the first and
`second frames.
`#26-1A to #26~5A and #26418 indicate 'I‘DMA time slots
`for the PCS high—speed data transfer in the first and second
`frames.
`#ZS-GA to #ZS-SA. #25-08 and #25-18 indicate TDMA
`time slots for the cellular low-speed data transfer in the first
`and second frames. #27-0A to #27-4A and #27-18 indicate
`time divided C DMA time slots for the cellular high-speed
`data communication in the first and secoan frames.
`
`FIG. 3 shows Uvaink and Down-Link of Time Division
`Duplex {TDD},
`the Up—Link corresponds to time slots
`expressed by R103 and R113 along a time axis, and Down-
`Link corresponds to time slots expressed by TI“ to Tim
`and TZLM to T2M along the time axis.
`Here, the time slots Rim, and R1 1,, of the Up-IJnk and the
`time slots TIM to T15m of the Down-Link compose one
`frame, and the time slots T2m to T2“ belong to a next
`frame. That is, FIG. 3 shows one frame and V: of a following
`frame.
`
`First, when information is transferred to the ground radio
`base station 3 from a station on the other end through the
`PSTN l and the mobile switching center 2, the information
`is converted into radio wave and is transmitted from the
`directional antenna 4 ofthe ground radio base station 3 to the
`stratospheric platform base station 7. Also, in the ground
`radio base station 3, the same information as the information
`is converted into radio wave and is transmitted from the
`antenna 5 to the subscriber station 10.
`
`Thereafter, in the stratospheric platform base station 7,
`when the radio wave transmitted from the ground radio base
`station 3 is received in the directional antenna 8. the radio
`wave is transferred from the antenna 9 to the subscriber
`station 10.
`Thereafter, in the subscriber station 10, the radio wave
`transmitted front the ground radio base station 3 is received
`in the antenna 11, and the radio wave transmitted from the
`stratospheric platform base station 7 is received in the
`antenna 11.
`
`Here, FIG. 4 is an explanatory diagram showing a delay
`time in the information transfer of a down fink which
`connects stations.
`
`A time position just after the radiation of the radio wave
`from the directional antenna 4 of the ground radio base
`station 3 is indicated by A, and a time position, at which the
`radio wave is received in the directional antenna 8 of the
`stratospheric platform base station 7, is indicated by B.
`Therefore, a delay time F indicates a propagation time in
`which the radio wave radiated from the directional antenna
`4 of the ground radio base station 3 is received in the
`directional antenna 8 of the stratospheric platform base
`station 7.
`
`Next, an operation is described.
`First, signals are transmitted or received between the
`subscriber station 10 and the stratospheric platform base
`station 7 or between the subscriber station 10 and the ground
`radio base station 3 by using a digital modulating method,
`and both the subscriber station 10 and the stratospheric
`platform base station 7 or both the subscriber station 10 and
`the ground radio base station 3 are connected with each other
`in radio communication according to a Frequency Division
`Multiple AecesstTime Division Duplex (FDMAITDD)
`method, a Code Division Multiple Accessflime Division
`Duplex (CDMNTDD) method, a Multi—carriers Time Divi—
`sion Multiple AccessFFrequency Division Duplex (TDMN
`EDD) method. TDMAFI‘DD method, a Time Divided
`CDMAIFDD method or
`a Time Divided CDMA/TDD _
`method.
`
`45
`
`50
`
`Mobile communication systems using these methods are
`described in detail
`in the Patent Application PC'IU‘JI’97rf
`02890 and the Patent Application PCTEJP97IO3492 submit-
`ted by the present inventors. However, a mobile communi—
`cation system. in which a case where a radio base station is
`arranged in a stratospheric platform is considered, is not
`described in the above submitted Patent Applications.
`Therefore, the mobile communication system is described in
`detail hereinafter.
`
`60
`
`65
`
`FIG. 3 shows an example of a time slot structure for a
`person communication system (PCS) and a cellular system
`
`In the mobile communication system having the strato-
`spheric platform base station 7, because it is considered that
`
`PETITIONERS 1064-001
`
`|PR2016-OO75
`
`PETITIONERS 1064-0014
`IPR2016-00758
`
`

`

`US 6,374,080 B2
`
`8
`same as the information transmitted from the mobile switch-
`ing center 2 to the for-IIAPS information processing unit 21)
`to be transferred from the mobile switching center 2 to the
`subscriber station 10 is received, a prescribed processing is
`performed to transmit
`the information to the subscriber
`station 10.
`
`7
`an elevation of the stratospheric platform 6 is about 20 km,
`it is assumed that a distance in a straight line between the
`ground radio base station 3 and the stratospheric platform
`base station 7 is 30 km, and the delay time F; 30x103i’f3x
`1(lR)—(t.1xl.0‘3-{l.l msec is obtained.
`As a standard example, one frame length of 10 msec is
`In the delay control unit 25, to synchronize the phase of
`shown in FIG. 4. This delay time I’ differs from a delay time
`the radio wave, which is directly received in the subscriber
`of 200 msec in a case of the satellite communication and is
`station II] from the ground radio base station 3, with the
`on the order of 1% of one frame length. Therefore,
`the
`phase of the radio wave which is received in the subscriber
`.
`.
`.
`.
`mobile communication system has a characteristic that the “3
`Slam” 1" {mm [he ground radio base will“ 3 “imth [he
`delay time F can be easily controlled. This characteristic is
`Eitralosphci-lc platfi‘wm base. Elana” 7’ [in qurmahim oulpm
`one reason that the introduction ot'the stratospheric platform
`twin tbs tor—MS “‘fm'i‘mn process“? mm 24 IS empo-
`base station 7 to the mobile communication system can be
`rarin held by a delay timetthe delay time J shown in FiG.
`casfly handled,
`15 4) set in the time setting unit 23. That is, when the delay time
`_
`_
`_
`_
`,
`_
`I
`J passes after the outputting of the information processed in
`A in“? position C Sh'fwm 1“ FIG; 4 ,mdlcalcs a_ I'm“
`the for-MS information processing unit 24 the information
`posmon Jug: all“ me rad“) waw‘ thh '5 recelved m the
`is oulput 10 [he [rammiugr 26_
`a
`directional antenna 8 of the stratospheric platform base
`["1
`,
`-
`5
`.
`.
`.
`.
`.
`I
`Thereafter in [he lmmmitlcr 26 the information out
`station 7 at the time position B and is transmitted from the
`antenna 9 m the SUbscriber Station 10’ ls weaved m the on from the delay control unit 25 is converted into radio wave,
`antenna 11 of the subscriber station 10.
`.
`.
`.
`'
`and the radio wave is transmitted from the antenna 5 to the
`subscriber station 10_
`Therefore, a delay time G indicates a summed time-period
`in the first
`As is apparent
`in the above description,
`(a sum Of a proc‘553mg [lmc'pcrlo‘] 1“ Eh“ Slralmphfmc
`embodiment, when the delay time J passes after the trans»
`platform base station 7 and a propagation ttmcnpcmfij)
`amending from,a “me of the reel-3pm?” or the “(1,10 wave In 25 mission of a radio wave to the stratospheric platform base
`we 5”_a‘°-‘3P!‘e“° Philme base (“Mien 7 m ,3 “m? or the
`station 7, another radio wave relating to the same informa-
`recepllon 0} me w‘dm waver Whflj‘h E "aflsmmed tron-'th
`tion as that ofthe radio wave is transmitted to the subscriber
`strat0spherie platform’ base station 7,’ in the subscriber
`station 10. Therefore, the phase of the radio wave, which is
`station 10 through a stgrial processing in the stratospheric
`directly transmitted from [he gmund radio base station 3’ is
`platform has‘: 5mm“ 7'
`3n synchronized with the phase of the radio wave, which is
`A150. bccal-ISO lhc radio wave ll‘aflsmiltt‘rd from “10
`transmitted from the ground radio base station 3 through the
`antenna 5 ofthe ground radio base station 3 directly arrives
`slramspheric plan‘mm base station 7,
`in mg su