US007782750B2
`
`(12) United States Patent
`Yamaura et a].
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`US 7,782,750 B2
`Aug. 24, 2010
`
`(54) RADIO COMMUNICATION METHOD,
`RADIO COMMUNICATION SYSTEM, RADIO
`
`COMMUNICATION BASE STATION, RADIO COMMUNICATION TERMINAL STATION,
`AND RADIO COMMUNICATION PROGRAM
`
`(75) Inventors: Tomoya Yamaura, Tokyo (JP);
`Kazuyuki Sakoda, Tokyo (JP);
`Yasunori Maeshima, Tokyo (JP);
`Hidemasa Yoshida, Chiba (JP)
`
`FOREIGN PATENT DOCUMENTS
`
`g JP
`
`JP
`JP
`JP
`JP
`JP
`JP
`
`i 10:2 47897
`
`M8604
`2000-115834
`2001_203664
`2001-274767
`2001-285181
`2001-285927
`
`9/1998
`M1999
`4/2000
`7/2001
`10/2001
`10/2001
`10/2001
`
`(73) Assignee: Sony Corporation, Tokyo (JP)
`
`OTHER PUBLICATIONS
`
`*
`_
`) Nonce:
`
`(
`
`_
`_
`_
`_
`subleqw any dlsclalmers_ the term Ofthls
`Pawnt 15 extended Or adjusted under 35
`U.S.C. 154(b) by 2080 days.
`
`Patent Abstracts of Japan, JP 09-046307, Feb. 14, 1997.
`YasushiYamao, et al., “Time diffusion M-ary code modulation and
`demodulation system suitable for slow speed digital signal transmis
`sion”, Information and Communication Engineers National Conven
`tion Lecture Memoirs, Mar. 6, 1988, 3 pages.
`
`21 A l. N .: 10/368 612
`(
`)
`pp
`0
`’
`
`* cited by examiner
`
`(22) Filed:
`
`Feb‘ 20’ 2003
`_
`_
`_
`Pnor Pubhcatlon Data
`US 2003/0224731 A1
`Dec. 4, 2003
`
`(65)
`
`(30)
`
`Primary ExamineriJayanti K Patel
`Assistant ExamineriJung Park
`(74) Attorney, Agent, or Firm4Oblon, Spivak, McClelland,
`Maier & Neustadt, LLP
`
`Foreign Application Priority Data
`
`(57)
`
`ABSTRACT
`
`(JP)
`
`........................... .. 2002-045233
`
`Feb. 21, 2002
`(51) Int Cl
`'
`'
`(200601)
`H04J 11/00
`(52) us. Cl. ..................... .. 370/206; 370/208; 455/633
`_
`_
`_
`Fleld 0f ClaSSl?CatlOIl Search .~ .............. .. ~
`_
`_
`370/208’ 455/6313’ 375/343
`See apphcanon ?le for Complete Search hlstory'
`References Cited
`
`(56)
`
`U-S~ PATENT DOCUMENTS
`
`A radio Communication method for exchanging information
`between a base station and a terminal station. The method
`includes: communicating the information between the base
`station and the terminal station b multi carrier si nals b
`.
`.
`y .
`g
`. y
`OFDM modulation scheme Including plural subcarriers
`a
`Communicating Control Signals in addi_
`tion to the information between the base station and the ter
`minal station, and wherein part of the control signals
`addressed to the terminal station from the base station is
`transmitted by one or more speci?c subcarriers in the band
`width for the multi-carrier signals.
`
`6,298,035 Bl * l0/200l Heiskala ................... .. 370/206
`6,442,220 B1 *
`8/2002 Sihlbom ................... .. 375/343
`
`17 Claims, 25 Drawing Sheets
`
`F R EQU ENCY
`
`Db
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`
`ERIC-1003
`Ericsson v IV
`Page 1 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 1 0f 25
`
`US 7,782,750 B2
`
`/
`
`F|G.1
`
`TERMINAL N4
`STATION
`
`3N TERMINAL
`STATION
`
`<
`
`BASE
`STATION
`
`/\,1
`
`EXTERNAL (W l RED) NETWORKS
`
`ERIC-1003 / Page 2 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 2 0f 25
`
`US 7,782,750 B2
`
`F|G.2
`
`RF TRANSMITTER ~122
`
`DA CONVERTER ~12]
`
`TIME WAVEFORM ~12
`SHAPING UNIT
`0
`
`119
`
`SUMMING UNIT
`
`1203
`
`COMPLEX 'FFT UN'T "V118 TERMINAL STATION
`CONTROL SIGNAL
`WAVEFORM
`N117 GENERATING UNIT
`
`MODULATOR
`
`INTERLEAVER ~1 16
`
`ENCODER
`
`N115
`
`SCRAMBLER
`
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`
`ENcRYPTING UNIT N1 13
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`cm ADDING UNIT ~1 12
`
`TRANSMISSION DATA N1 H
`PROCESSING UNIT
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`'\—/I02
`CONTROL UNIT W101
`
`I
`100
`
`ERIC-1003 / Page 3 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet3 0f25
`
`US 7,782,750 B2
`
`FIG.3
`
`NARROW-BAND CARR l ER FOR
`CONTROL S l GNALS
`
`A
`
`C1
`
`C3
`
`I
`5.17GHz
`
`5. 'IQGHZ
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`5. 18GHZ
`
`I
`I
`5.21GHz
`
`C13
`
`6
`
`C4
`
`5.23GHz
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`5.22GHz
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`FREQUENCY
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`FIG.4
`
`FREQUENCY
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`
`Db
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`Db
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`two; Wm 10m
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`
`ERIC-1003 / Page 4 of 43
`
`

`

`U.S. Patent
`
`meA
`
`2B0
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`ERIC-1003 / Page 5 of 43
`
`ERIC-1003 / Page 5 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 5 0f 25
`
`US 7,782,750 B2
`
`F|G.6
`
`T223
`
`ANTENNA “222
`MULTIPLEXER
`221
`
`RF TRANSMITTER
`RF AMPL'F'ER
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`230
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`233
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`231
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`SYNTHES I ZER
`
`l
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`234
`2
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`l
`l
`I
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`FIRST AD
`241
`W CONVERTER
`III
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`CONTROL sIGNAL
`RECEIVER
`
`242
`
`235x
`SECOND FILTER
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`l
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`II
`2 1\ sEcOND AD
`5
`CONVERTER
`252
`
`SYNCHRUNIZING
`CIRCUIT
`
`SR'I‘ELEX FFT
`
`255
`
`EOUALIZER
`
`220
`I DA CONVERTERJ
`/
`219
`
`TIME WAVEFORM
`
`COMPLEX IFFT
`UNI‘
`
`218
`
`217
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`216
`INTERLEAVER
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`256\| DEMODULATOR I
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`
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`ENCODER
`
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`ENcRYPTING UNIT
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`252 RECEIVED DATA
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`TRANSMITTING DATA
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`204“
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`
`215
`
`214
`
`213
`
`212
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`DATA INPUT/OUTPUT
`PROCESSING uNIT
`
`K.
`201
`
`200
`
`ERIC-1003 / Page 6 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 6 0f 25
`
`US 7,782,750 B2
`
`FIG.7
`
`S1 1
`
`ASSOCIATION FOR RECoGNITIoN
`AND REGISTRATION AND SETTING
`OF FREQUENCY OF INTERMITTENT
`STAND—BY
`
`512
`
`THERE IS NO CALLING
`FOR ONE'S OWN STATION
`(OR GRouP INCLUDING IT)
`:TIMER SETTING
`
`TIMER SETTING
`
`513
`
`0F CALLING
`
`LHESE ISNINOSPAGI‘NIC
`
`o N
`0 0 '
`STATION (0R GRouP
`INCLUDING IT);
`TIMER SETTING
`
`T'MER
`
`RECEPTION OF
`NARROW-BAND
`STAND—BY SIGNAL
`
`514
`
`THERE IS PAGING FOR
`ONE'S OWN STATION
`(OR GROUP INCLUDING IT)
`
`RECEPTIoN OF CONTROL FIELD
`OF NEXT FRAME BY CARRIER FOR
`INFORMATION COMMUNICATION
`THERE IS AN ALLOCATION
`OF COMMUNICATION
`RESOURCES TO ONE’S
`OWN STATION
`
`515
`
`TRANSMISSION AND
`RECEPTION OF TRAFFIC
`
`S16
`
`ERIC-1003 / Page 7 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 7 0f 25
`
`US 7,782,750 B2
`
`FIG.8
`
`ASSOCIATION FOR RECOGNITION
`AND REGISTRATION AND SETTING
`0F FREQUENCY OF INTERMITTENT
`STAND-BY
`
`$12
`
`THERE IS NO CALLING
`FOR ONE'S OWN STATION;
`TIMER SETTING
`
`SLEEP STATE
`
`S13
`
`COMPLETION
`OF CALLING
`
`TIMER SETTING
`
`THERE IS NO PAGING
`FOR ONE'S OWN
`STATION (OR GROUP
`INCLUDING IT) J
`TIMER SETTING
`
`RECEPTION OF
`NARROW-BAND
`STAND-BY SIGNAL
`
`THERE IS PAGING FOR
`ONE'S OWN STATION
`(OR GROUP INCLUDING IT)
`
`TRANSMISSION OF RANDOM
`ACCESS CHANNEL; RECEPTION OF
`REPLY TO IT
`
`517
`
`THERE IS CALLING FOR
`ONE’S OWN STATION
`
`TRANSMISSION AND
`RECEPTION OF TRAFFIC
`
`S18
`
`ERIC-1003 / Page 8 of 43
`
`

`

`U.S. Patent
`
`Aug. 24, 2010
`
`Sheet 8 of 25
`
`US 7,782,750 B2
`
`ELEV
`
`mgom2>m
`cu.
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`mm
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`
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`
`ERIC-1003 / Page 9 of 43
`
`4<2.2mm#
`
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`ERIC-1003 / Page 9 of 43
`
`
`
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`
`

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`ERIC-1003 / Page 10 of 43
`
`ERIC-1003 / Page 10 of 43
`
`
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 10 0f 25
`
`US 7,782,750 B2
`
`F|G.11A
`TxBit=(000)
`
`F|G.11B
`TxB i t=(001)
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`
`ERIC-1003 / Page 11 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 11 0125
`
`US 7,782,750 B2
`
`CLUE
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`
`ERIC-1003 / Page 12 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 12 0f 25
`
`US 7,782,750 B2
`
`MZTF
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`ERIC-1003 / Page 13 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 13 0f 25
`
`US 7,782,750 B2
`
`
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`ERIC-1003 / Page 14 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 14 0f 25
`
`US 7,782,750 B2
`
`F I G. I 5
`
`242
`
`(AD CONVERTER)
`
`244
`
`REFERENCE
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`GENERATOR
`
`CORRELATION
`THRESHOLD
`SETTING UNIT
`
`204
`
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`
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`
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`CALCULATOR
`
`245
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`
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`
`ERIC-1003 / Page 15 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 15 0f 25
`
`US 7,782,750 B2
`
`NUMBER)
`A
`
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`ERIC-1003 / Page 16 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 16 0f 25
`
`US 7,782,750 B2
`
`F|G.18
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`
`ERIC-1003 / Page 17 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 17 0f 25
`
`US 7,782,750 B2
`
`FIG.I9
`
`S1 1
`
`ASSOCIATION FOR RECOGNITION
`AND REGISTRATION AND SETTING
`OF FREQUENCY OF INTERMITTENT
`STAND—BY
`
`512
`
`THERE IS NO CALLING
`FOR ONE’S OWN STATION
`(OR GROUP INCLUDING IT)
`§TIMER SETTING
`
`TIMER SETTING
`
`S13
`
`OF CALLING
`
`THERE IS NO PAGING
`FOR ONE S OWN
`STATION (OR GROUP
`INCLUDING IT) I
`TIMER SETTING
`
`TIMER
`
`RECEPTION OF
`NARROW-BAND
`STAND-BY SIGNAL
`
`S14
`
`THERE IS PAGING FOR
`ONE'S OWN STATION
`(OR GROUP INCLUDING IT)
`
`RECEPTION BY BROAD BAND OF )N D 519
`BROADCAST PREAMBLE. BCH, AN
`FCH OF NEXT FRAME
`
`
`
`THERE IS AN ALLOCATION
`OF COMMUNICATION
`RESOURCES TO ONE'S
`OWN STATION
`
`TRANSMISSION AND
`RECEPTION OF TRAFFIC
`
`S20
`
`ERIC-1003 / Page 18 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 18 0f 25
`
`US 7,782,750 B2
`
`F | 6.20
`
`SUBCARRIERS TO TRANSMIT CONTROL
`SIGNALS TO TERMINAL STATION
`
`FREQUENCT
`f0 (DC m EQUIVALENT
`BASE BAND SYSTEM)
`
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`
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`
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`
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`(SUBCARRIER
`NUMBER)
`1‘
`
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`PREAMBLE
`
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`
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`(f0)
`
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`SCs
`
`1/
`
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`
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`
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`
`TIME
`
`ERIC-1003 / Page 19 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 19 0f 25
`
`US 7,782,750 B2
`
`F|G.22
`
`SUBCARRIERS TO TRANSMIT CONTROL
`SIGNALS TO TERMINAL STATION
`501
`
`.
`
`.
`
`7
`
`V
`
`FREQUENCY
`f0 (DC IN EQUIVALENT
`BASE BAND SYSTEM)
`
`:>
`2_|
`:Ju_>
`n:
`l
`
`UUJV)
`waz
`0.0m
`
`was
`
`FREQUENCY
`(SUBCARRlER
`NUMBER)
`
`BROADCAST
`PREAMBLE
`
`DOWN—_L|NK
`EAMBLE
`
`SC1
`
`DC
`(f0)
`
`BCH FCH ACH
`
`SCH LCH
`
`.
`
`TIME
`
`ERIC-1003 / Page 20 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 20 0f 25
`
`US 7,782,750 B2
`
`F | (5.24
`
`SUBCARRIERS TO TRANSMIT CONTROL
`SIGNALS T0 TERMINAL STATION
`
`SCI SCa
`
`
`
`FREQUENCY
`
`xD
`
`2_J
`:HL>
`m H
`Hah—
`ouun
`ue=z
`acnu
`WQJ:
`
`f0 (DC IN EQUIVALENT
`BASE BAND SYSTEM)
`
`FREQUENCY
`(SUBCARRIER
`NUMBER)
`
`BROADCAST
`PREAMBLE
`
`DOWN-LINK
`PREAMBLE
`
`Dc
`(To)
`
`
`
`
`:zzzzzzzzzzzzzzzazzzzzza
`
`
`
`.
`
`TIME
`
`ERIC-1003 / Page 21 of 43
`
`ERIC-1003 / Page 21 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 21 0f 25
`
`US 7,782,750 B2
`
`FIG.26
`
`
`
`
`RECEPTION
`PROCESSING
`
`
`
`233
`
`292
`
`293
`
`
`
` BAND
`250
`PASS
`
`
`FILTER
`
`RECEPTION
`
`PROCESSING
`
`
`
`233
`
`292
`
`293
`
`ERIC-1003 / Page 22 of 43
`
`ERIC-1003 / Page 22 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 22 0f 25
`
`US 7,782,750 B2
`
`
`
`F|G.28
`
`2ms
`
`ULPhase
`
`
`
`
`
`
`MACFRAME
`
`ERIC-1003 / Page 23 of 43
`
`ERIC-1003 / Page 23 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 23 0f 25
`
`US 7,782,750 B2
`
`FREQUENCY
`5.23GHz
`
`5.1QGH2
`
`5.17GHz
`
`F|G.29
`
`20MHZ
`
`ERIC-1003 / Page 24 of 43
`
`ERIC-1003 / Page 24 of 43
`
`

`

`US. Patent
`
`Aug. 24, 2010
`
`Sheet 24 0f 25
`
`US 7,782,750 B2
`
`F | (3.30
`
`20.0000MHZ
`
`
`15.5625MH2
`
`
`
`f0 (DC IN EQUIVALENT
`BASE BAND SYSTEM)
`
`FREQUENCY
`
`F|G.31
`
`FREQUENCY
`
`
`
`CHANNEL TO TRANSMIT CONTROL
`SIGNAL TO MOBILE STATIONS
`
`
`
`
`
`Payl
`
`mm
`
`
`
`ZOMHz
`
`
`
`oad
`
`‘urst
`
`DL
`
`
`
`YIoad
`YIoad
`Vload
`III. I.
`BCHP FGIP
`ACHP DLPr
`BCPr
`
`
`
`T I ME
`
`urst
`oad
`I
`DL Payl
`
`
`
`1 MAC FRAME (2ms)
`
`ERIC-1003 / Page 25 of 43
`
`ERIC-1003 / Page 25 of 43
`
`

`

`U.S. Patent
`
`Aug. 24, 2010
`
`Sheet 25 0f 25
`
`US 7,782,750 B2
`
`FIG.32
`
`‘7 323
`
`ANTENNA
`MULTIPLEXER
`
`RF TRANSMITTER
`
`RF RECEIVER
`
`331
`
`332
`
`333
`
`3
`
`DA CONVERTER
`
`COMPLEX IFFT
`I
`
`318
`
`319“I:g
`MODULATOREl.
`'Iin
`JIIJJ
`J 1"“y
`
`301
`
`I.
`
`DEINTERLEAVER
`
`INTERLEAVER
`
`DECODER
`
`ENCODER
`
`DESCRAMBLER
`
`SCRAMBLER
`
`C' PHER REMOVE“
`
`ENCRYPTI NG UNIT
`
`RC CHECKING
`NIT
`
`RECEIVED DATA
`PROCESSING UNI
`
`CRC ADDING UNIT
`
`ERANSMITTING DATA
`3'.
`k
`
`CONTROL UNIT
`
`A 302
`
`DATA INPUT/OUTPUT
`PROCESSING UNIT
`
`300
`
`ERIC-1003 / Page 26 of 43
`
`ERIC-1003 / Page 26 of 43
`
`

`

`US 7,782,750 B2
`
`1
`RADIO COMMUNICATION METHOD,
`RADIO COMMUNICATION SYSTEM, RADIO
`COMMUNICATION BASE STATION, RADIO
`COMMUNICATION TERMINAL STATION,
`AND RADIO COMMUNICATION PROGRAM
`
`BACKGROUND OF THE INVENTION
`
`1. Field of the Invention
`
`The present invention relates to a radio communication
`method, a radio communication system, a radio communica-
`tion base station, a radio communication terminal station, and
`a radio communication program to be installed in equipment
`constituting said system, all of which are suitably applicable
`to the radio communication system for data communication.
`According to the present invention, they are particularly suit-
`able for radio transmission based on OFDM modulation (Or-
`thogonal Frequency Division Multiplexing).
`2. Description of the Related Art
`Attempts are being made to use for public multi-cell ser-
`vice the radio communication system which has originally
`been developed for the wireless LAN system to perform
`information transmission by means of OFDM modulation.
`OFDM modulation is a multi-carrier modulation scheme, in
`which one transmission channel available is divided into a
`
`plurality of subcarriers which are individually modulated
`with information to be transmitted. The radio communication
`
`system that employs OFDM modulation has good multi-path
`resistance and is suitable for mobile high-speed data commu-
`nication because of its property that the duration of one
`OFDM symbol is longer than the delay time of multi-path
`delayed waves in mobile radio communication.
`FIG. 29 is a diagram showing the arrangement of carries in
`the conventional radio communication system. This arrange-
`ment accords to the scheme called HiSWANa. According to
`this scheme, the frequencies of the center carrier are 5.17
`GHZ, 5.19 GHZ, 5.21 GHZ, and 5.23 GHZ, and a signal band
`of 20 MHZ (including a guard band) is assigned to each
`carrier.
`
`FIG. 30 is a diagram showing the arrangement of subcar-
`riers of one transmission channel in the conventional radio
`
`communication system. In each 20 MHZ band shown in FIG.
`29 are arranged the subcarriers, which have been generated by
`OFDM modulation, at intervals of 312.5 KHZ. There are 53
`subcarriers in total for information transmission. Of these 53
`
`subcarriers, the subcarrier at the center (or the subcarrier
`centered at DC in the equivalent base band) is a null carrier
`which does not transmit information. (It corresponds to the
`subcarrier with a center frequency f0 in the carrier frequency
`band.) The frequency band used for information transmission
`is 16.5625 MHZ, and both sides ofthe band are isolated from
`adjacent carriers by a guard band of about 1.7 MHZ. This
`guard band is not used for information transmission.
`FIG. 31 is a diagram showing an example of the format
`used to transmit control signals in the conventional radio
`communication system. In this system, the MAC frame is
`defined, which is a transmitting-receiving unit having a
`period of 2 ms. One radio frame has a length of 2 ms, and it is
`composed of four sections: broadcast burst, down-link phase,
`up-link phase, and contention phase. Incidentally, FIG. 31
`shows only the broadcast burst and down-link phase, and the
`down-link phase is shown as down-link burst payload (DL
`burst payload).
`The broadcast burst and down-link phase are sections for
`transmission from a base station to terminal stations. The
`
`broadcast burst is a section for transmission of control signals
`to all terminal stations under the control of the base station.
`
`2
`
`The down-link phase is a section consisting mainly of a
`plurality of downbursts to transmit traffic data to each termi-
`nal station. The up-link phase and contention phase are sec-
`tions for transmission from terminal stations to a base station.
`
`The broadcast burst includes broadcast preamble, BCH to
`transmit the base station information, FCH to transmit the
`allocation of traffic channel in the same frame to each termi-
`
`nal station, and ACH to reply to RCH used for calling from
`terminal stations.
`
`The down-link phase includes SCH, which is a short traffic
`channel, and LCH, which is a long trafiic channel. It is
`designed such that a plurality of SCH and/or LCH can jointly
`used for one mobile station in the period of down-link phase.
`This is called PDU (protocol data unit) train. The down-link
`preamble is attached to the head of each PDU train. One PDU
`train having a down-link preamble attached thereto is called
`down-link burst. In the period of up-link burst are contained
`SCH (which is a short trafiic channel) and LCH (which is a
`long trafiic channel). In the up-link, too, the PDU train is
`formed as in the case of down-link, and the up-link preamble
`is attached to the head of each PDU train. One PDU train
`
`having an up-link preamble attached thereto is called up-link
`burst. The contention phase contains RCH which is used for
`calling from mobile stations. To the head of each RCH is
`attached the up-link preamble to form the up-link burst.
`The broadcast preamble has a length of 16 us, and terminal
`stations receive this section to accomplish search of base
`stations, acquisition of initial synchronization, frame syn-
`chronization, frequency error correction, and symbol syn-
`chronization, after power has been turned on. The down-link
`preamble has a length of 8 us, and terminal stations receive
`this section to accomplish more accurate timing correction,
`frequency error correction, and symbol synchronization. The
`up-link preamble has a length of 16 us, and base stations
`receive this section to accomplish the timing correction, fre-
`quency error correction, and symbol synchronization for
`transmitting signals from terminal stations.
`Such a system is constructed such that the terminal station
`calling signal is transmitted as traffic channel allocation infor-
`mation to each terminal station in FCH and the terminal
`
`station in the waiting mode waiting for being called judges
`whether or not it is called after it has received all of BCH and
`FCH in the broadcast burst.
`
`5
`
`10
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`15
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`20
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`25
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`30
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`35
`
`40
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`45
`
`Incidentally, there is another possible way of operation in
`which BCH and FCH in the broadcast burst in the head of all
`frames are not received but the frame intervals to be received
`
`50
`
`55
`
`60
`
`65
`
`by negotiation between a base station and a terminal station is
`thinned in order to increase the stand-by time in the terminal
`station.
`
`FIG. 32 is a diagram showing the construction of a terminal
`station 300 in the ratio communication system that employs
`the conventional OFDM modulation. First, the construction
`of the transmission system will be explained step by step
`along the flow of signals. The data input/output processing
`unit 301 receives sound signals in the case of voice commu-
`nication or data signals in the case of data communication by
`connection to a computer. It converts such signals into an
`adequate digital data string. The resulting output enters the
`transmitting data processing unit 311. Ifnecessary, it receives
`from the control unit 302 communication control data to be
`
`transmitted to another OFDM radio equipment (base station),
`which is the called party of radio communication (not
`shown), and after multiplexing, it forms and outputs the frame
`and slot structure for transmission through the radio channel.
`The output enters the CRC (Cyclic Redundancy Check)
`adding unit 3 12, for addition ofredundancy to detect errors in
`the receiving end. The output from 312 enters the cipher unit
`
`ERIC-1003 / Page 27 of 43
`
`ERIC-1003 / Page 27 of 43
`
`

`

`US 7,782,750 B2
`
`3
`313. After encryption, the output from 313 enters the scram-
`bler 314 in which scrambling is performed for pseudo ran-
`domization according to a prescribed algorithm. The output
`from 314 enters the encoding unit 315 in which error correc-
`tion encoding is performed. There are several known methods
`for encoding, such as convolution coding,
`turbo coding,
`Reed-Solomon coding, and continuous coding (in which a
`plurality of coding methods are combined).
`The output from the encoding unit 315 enters the inter-
`leaver 316, which performs interleaving (rearrangement of
`encoded bits according to a prescribed rule) so that the receiv-
`ing end can convert burst errors into random errors by deinter-
`leaving (reverse operation). The output from 316 enters the
`modulator 317, which, after mapping on the signal point at the
`time of transmission, outputs the in-phase component
`(I-component) and quadrature component (Q-component).
`The output from 317 enters the complex IFFT unit 318, which
`performs inverse fast Fourier transform for OFDM modula-
`tion.
`
`The output from 3 18 enters the time waveform shaping unit
`319,
`in which guard time is established by addition of
`cycleprefix and windowing is performed so as to smoothen
`the rise and fall ofthe OFDM modulation symbol. The output
`from 319 enters the DA converter 320, which performs con-
`version from digital waveform into analog waveform. The
`output from 320 enters the RF transmitter 321, which per-
`forms filtering, vector modulation for I-component and
`Q-component, frequency conversion into an adequate trans-
`mitting frequency channel, transmitting power control, and
`amplification.
`The output from the RF transmitter 321 enters the antenna
`multiplexer 322. The output from 322 enters the antenna 323
`to be eventually transmitted in the form of electromagnetic
`wave. The transmitted signals are received by another OFDM
`radio equipment (base station) which is the called party of
`radio communication (not shown). The antenna multiplex
`323 is designed to separate transmitting signals and receiving
`signals from each other. Usually, an antenna switch is used for
`TDD system or FDD/TDMA system in which transmission
`and reception are accomplished in different timing, and a
`duplexer is used in other cases.
`Next, the structure of the receiving system of the terminal
`station 300 will be explained. The signals which are received
`by the terminal station 300 are those which have been trans-
`mitted by the other OFDM radio equipment (base station) as
`the called party of radio communication (not shown). It is
`assumed that the transmitting signals have been formed by the
`same processing as in the terminal station 300 mentioned
`above.
`
`The transmitting signal from the other OFDM radio equip-
`ment (base station) as the called party of radio communica-
`tion (not shown) is received (in the form of electromagnetic
`wave) by the antenna 323. This signal is separated from the
`local transmitting signal by the antenna multiplexer 322, and
`the separated signal enters the RF receiver 331 which is the
`receiving circuit. The RF receiver 331 performs amplifica-
`tion, attenuation of undesired frequency components, selec-
`tion of desired frequency channel, frequency conversion,
`level control of receiving signal amplitude, vector detection
`to separate I-component and Q-component from each other,
`and band limitation.
`It finally outputs I-component and
`Q-component. The output from the RF receiver 331 enters the
`AD converter 332, which performs conversion from analog
`waveform into digital waveform.
`The output from 332 enters the synchronizing circuit 333,
`which performs frame synchronizing and frequency error
`correction. In the case where any party available for commu-
`
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`25
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`35
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`40
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`45
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`50
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`55
`
`60
`
`65
`
`4
`
`nication is searched immediately after power is turned on, the
`synchronizing circuit 333 performs synchronizing signal
`detection and initial synchronizing. The output from 333
`enters the time waveform shaping unit 334, which performs
`time waveform shaping to remove guard time by addition of
`cycleprefix. The output from 334 enters the complex FFT unit
`335, which performs fast Fourier transform for OFDM
`demodulation. The output from 335 enters the equalizer 336.
`The equalizer 336 estimates the transmission line and per-
`forms equalization according to the result of estimate. In
`some cases, information from the synchronizing circuit 333 is
`also entered to the equalizer 336 to estimate the transmission
`line. The output from the equalizer 336 enters the demodula-
`tor 337, which performs signal point judgment and outputs
`the estimated value of received bit. The output from 337
`enters the deinterleaver 338, which performs deinterleaving
`to rearrange the string of coded bits according to a prescribed
`rule. The output from 338 enters the decoder 339, which
`decodes the error correction code given by the transmitting
`end.
`
`The output from 339 enters the descrambler 340, which
`performs descrambling as the inverse conversion of the
`scrambling performed in the transmitting end. The output
`from 340 enters the cipher remover 341, which removes
`cipher made by the transmitting end. The output from 341
`enters the CRC checking unit 342, which outputs data from
`which CRC has been removed and the result ofCRC checking
`of received blocks. The output from 342 enters the received
`data processing unit 343, which outputs data with the frame
`structure and slot structure (for transmission through the
`radio channel) removed, if it judges that there are no errors in
`the result of CRC checking of received blocks. The output
`from 343 enters the data input/output processing unit 301,
`which, after conversion, outputs sound signals in the case of
`voice communication or data signals in the case of data com-
`munication connected to a computer.
`In the case where communication control data is contained
`which has been transmitted from the base station as the called
`
`party of radio communication (not shown), the received data
`processing unit 343 takes out that part, and the output enters
`the control unit 302 through the receiving system control line
`304. The control unit interprets the received control data and
`controls the action of each unit of the terminal station 300
`
`according to the instruction.
`In the case where the ARQ (Automatic Request for Recep-
`tion) system is employed, the received data processing unit
`343 functions as follows. If the input signal from the CRC
`checking unit 342 contains information that the received
`block contains no errors, it outputs the received block to the
`received data processing unit 343 and also outputs to the
`control unit 302 through the receiving system control line
`304, to the effect that the received block contains no errors.
`Upon receipt of this output, the control unit 302 instructs the
`transmitting data processing unit 311 through the transmit-
`ting system control line 303 to transmit ACK signal to the
`other OFDM radio equipment (base station) as the called
`party of radio communication (not shown). The transmitting
`data processing unit 311 sends ACK signal after performing
`multiplexing on the transmitting data. The ACK signal is
`transmitted to the base station by processing of the transmit-
`ting system as explained above.
`Conversely, if the input signal from the CRC checking unit
`342 contains information that the received block contains
`
`errors, it does not output the received block to the received
`data processing unit 343 but outputs to the control unit 302
`through the receiving system control line 304, to the effect
`that the received block contains errors. Upon receipt of this
`
`ERIC-1003 / Page 28 of 43
`
`ERIC-1003 / Page 28 of 43
`
`

`

`US 7,782,750 B2
`
`5
`output, the control unit 302 instructs the transmitting data
`processing unit 311 through the transmitting system control
`line 303 to transmit NAK signal to the base station as the
`called party of radio communication (not shown). The trans-
`mitting data processing unit 311 sends NAK signal after
`performing multiplexing on the transmitting data. The NAK
`signal is transmitted to the base station by processing of the
`transmitting system as explained above. Upon receipt of this
`transmission, the base station retransmits the block by which
`NAK signal has been transmitted.
`In the case of stream communication, like voice commu-
`nication, in which retransmission by the ARQ system is not
`employed, the received data processing unit 343 functions as
`follows. If the input signal from the CRC checking unit 342
`contains information that the received block contains no
`
`errors, it outputs the received block to the received data pro-
`cessing unit 343 as mentioned above. Conversely, if the input
`signal from the CRC checking unit 342 contains information
`that the received block contains errors, the received data
`processing unit 343 discards the received block (handling it as
`erasure) and performs interpolation by using the received
`block before one block.
`
`Each part of the transmitting system is connected to the
`control unit 302 through the transmitting system control line
`303, and the control unit 302 controls and monitors various
`operations for the transmitting system through it (such as
`on-off of the transmitting system, control and monitor of the
`RF transmitter 321, fine adjustment of transmitting timing,
`change of the coding system and signal point mapping, and
`control ofretransmitting). Eachpart ofthe receiving system is
`connected to the control unit 302 through the receiving sys-
`tem control line 304, and the control unit 302 controls and
`monitors various operations for the receiving system through
`it (such as on-off ofthe receiving system, control and monitor
`of the RF receiver 331, fine adjustment of receiving timing,
`change of the coding system and signal point mapping, and
`control of retransmitting).
`The conventional OFDM communication system men-
`tioned above works in such a way that the signal to call a
`terminal station from a base station is transmitted, with all
`information placed on subcarriers in the transmission band,
`and the called terminal station receives all the subcarriers to
`
`receive the calling signal. This means that the terminal station
`has to receive and decode the band signal (corresponding to
`20 MHZ) every 2 ms regardless ofpresence or absence of data
`being transmitted and received. It follows, therefore, that
`large quantities of signals have to be processed even when no
`information data is transmitted and received. This leads to a
`waste of batteries in the case where the terminal station is a
`
`battery-driven mobile station.
`One known way to address this problem is to thin out the
`frame intervals to be received by negotiation between a base
`station and a terminal station, instead of receiving control
`signal frames in all MAC frames.
`However, even in the case where the frame intervals to be
`received are thinned out, the frame period to be received
`needs reception in the same way as information transmission
`and reception. Therefore, loads in a terminal station are not so
`reduced by the above-mentioned way.
`
`OBJECT AND SUMMARY OF THE INVENTION
`
`5
`
`10
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`20
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`25
`
`30
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`35
`
`40
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`45
`
`50
`
`55
`
`60
`
`The present invention was completed to reduce loads in a
`base station or a terminal station when control signals are
`transmitted fr