US008199792B2
`
`(12) United States Patent
`Nakao et al.
`
`(10) Patent N0.:
`(45) Date of Patent:
`
`US 8,199,792 B2
`Jun. 12, 2012
`
`(54)
`
`(75)
`
`RADIO COMMUNICATION APPARATUS AND
`RESPONSE SIGNAL SPREADING METHOD
`
`Inventors: Seigo Nakao, Kanagawa (JP); Daichi
`Imamura, Kanagawa (JP); Akihiko
`Nishio, Kanagawa (JP); Masayuki
`Hoshino, Kanagawa (JP)
`
`(73)
`
`Assignee: Panasonic Corporation, Osaka (JP)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(21)
`
`Appl. No.: 13/280,190
`
`(22)
`
`Filed:
`
`Oct. 24, 2011
`
`(65)
`
`(63)
`
`Prior Publication Data
`
`US 2012/0039258 A1
`
`Feb. 16,2012
`
`Related US. Application Data
`
`Continuation of application No. 13/165,538, ?led on
`Jun. 21, 2011, Which is a continuation of application
`No.
`12/593,904,
`?led as
`application No.
`PCT/JP2008/001526 on Jun. 13, 2008, noW Pat. No.
`8,009,721.
`
`(30)
`
`Foreign Application Priority Data
`
`Jun. 15, 2007
`Jun. 19, 2007
`
`(JP) ............................... .. 2007-159580
`
`(JP) ............................... .. 2007-161966
`
`(51)
`
`(52)
`(58)
`
`Int. Cl.
`(2006.01)
`H04B 1/00
`US. Cl. ..................................................... .. 375/146
`
`.. 375/130,
`Field of Classi?cation Search ..
`375/146, 260, 295; 370/2084210
`See application ?le for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`6,377,539 B1
`4/2002 Kang et a1.
`7,376,117 B2
`5/2008 Erlich et al.
`7,539,463 B2
`5/2009 Himayat et al.
`7,852,959 B2 * 12/2010 Kwak et a1. ................. .. 375/260
`7,929,415 B2
`4/2011 Kwak et a1.
`7,957,263 B2 *
`6/2011 Gaal ........................... .. 370/209
`8,036,166 B2 * 10/2011 Tiirola et al. ........ ..
`370/329
`2007/0171995 A1* 7/2007 Muharemovic et a1. .... .. 375/260
`2007/0230600 A1 10/2007 Bertrand et al.
`(Continued)
`
`JP
`
`FOREIGN PATENT DOCUMENTS
`2004297593 A 10/2004
`(Continued)
`OTHER PUBLICATIONS
`
`3GPPTM, 3GPP TSG RAN WGl #46bis, R1-062841, Seoul, Korea,
`Oct. 9-13, 2006, 7 pages.
`
`(Continued)
`Primary Examiner * Khanh C Tran
`(74) Attorney, Agent, or Firm * Seed IP LaW Group PLLC
`(57)
`ABSTRACT
`A Wireless communication apparatus capable of minimizing
`the degradation in separation characteristic of a code multi
`plexed response signal. In this apparatus, a control part (209)
`controls both aAC sequence to be used in a primary spreading
`in a spreading part (214) and a Walsh sequence to be used in
`a secondary spreading in a spreading part (217) so as to allow
`a very small circular shift interval of the ZC sequence to
`absorb the interference components remaining in the
`response signal; the spreading part (214) uses the ZC
`sequence set by the control part (209) to primary spread the
`response signal; and the spreading part (217) uses the Walsh
`sequence set by the control part (209) to secondary spread the
`response signal to Which PC has been added.
`24 Claims, 15 Drawing Sheets
`
`GYGLIG SHIFT VALUE OF ZG SEQUENCE (O~11)
`
`PUCCH
`
`PUCCH
`
`PUCGH
`
`PUCCH
`
`PUCCH
`
`PUCCH
`
`PUCGH
`
`PUCCH
`
`PUCGH
`
`PUCCH
`#10
`
`PUGCH
`
`PUCCH
`
`BlackBerry Exhibit 1001, pg. 1
`
`

`
`US 8,199,792 B2
`Page 2
`
`U.S. PATENT DOCUMENTS
`2008/0212464 A1
`9/2008 Kim et al.
`2008/0232449 A1
`9/2008 Khan et al.
`2008/0268860 A1 10/2008 Lunttila et al.
`2008/0293424 A1 11/2008 Cho et al.
`2008/0298433 A1 12/2008 Tiirola et al.
`2008/0298488 A1 12/2008 Shen et al.
`2008/0310540 A1 12/2008 Tiirola et al.
`2008/0311942 A1 12/2008 Kim et al.
`2009/0022135 A1
`1/2009 Papasakellariou et a1.
`2009/0028065 A1
`1/2009 Iwai et a1.
`2009/0046646 A1
`2/2009 Cho et al.
`2010/0046480 A1
`2/2010 Kawamura et al.
`2010/0135273 A1
`6/2010 Kim
`
`JP
`WO
`
`FOREIGN PATENT DOCUMENTS
`2005333344 A 12/2005
`2008053930 A1
`5/2008
`
`OTHER PUBLICATIONS
`
`3GPPTM, 3GPP TSG RAN WG1 Meeting #47bis, R1-070394, Sor
`rento, Italy, Jan. 15-19, 2007, 5 pages.
`3GPPTM, 3GPP TSG RAN WG1 Meeting #48bis, R1-071650, St.
`Julians, Malta, Mar. 26-30, 2007, 3 pages.
`“3rd Generation Partnership Project; Technical Speci?cation Group
`Radio Access Network; Evolved Universal Terrestrial Radio Access
`(E-UTRA); Physical Channels and Modulation (Release 8),” Tech
`nical Speci?cation 3GPP TS 36.211 (V8.3.0), 3rd Generation Part
`nership Project (3GPPTM), Valbonne, France, May 2008.
`“Coherent Uplink ACK/NAK Transmission With high Speed UEs,”
`Report R1-072857, 3GPP TSG RAN WG1 Meeting #49, Orlando,
`Fla, Jun. 25-29, 2007, 6 pages.
`“Coherent Uplink ACK/NAK Transmission With high Speed UEs,”
`Report R1-073429, 3GPP TSG RAN WG1 Meeting #50, Athens,
`Aug. 20-24, 2007, 4 pages.
`“Multiplexing Capability of Cle and ACK/NACKs Form Different
`UEs,” 3rd Generation Partnership Project (3GPPTM) TSG RAN WG1
`Meeting #49, Kobe, Japan, May 7-11, 2007, 4 pages.
`
`“Selection of Orthogonal Cover and Syclic Shift for High Speed UL
`ACK,” Report R1-073564, 3GPP TSG RAN WG1 Meeting #50,
`Athens, Aug. 20-24, 2007, 5 pages.
`“Usage of Cyclic Shifts and Block-Wise Spreading Codes for Uplink
`ACK/NACK,” Report R1-073618, 3GPP TSG RAN WG1 Meeting
`#50, Athens, Aug. 20-24, 2007, 5 pages.
`Burstrom et al., “Uplink Control Channel in E-UTRA, Radio Link
`and Radio Network Evaluation,” IEEE Wireless Communications
`and Networking Conference (WCN 2008), Las Vegas, Nev., Mar.
`31-Apr. 3, 2008, pp. 835-839.
`Extended European Search Report, for European Application No.
`087641213, dated Jul. 19, 2011, 7 pages.
`International Search Report, mailed Jul. 8, 2008, issued in corre
`sponding International Application No. PCT/JP2008/001526, ?led
`Jun. 13,2008.
`Kawamura et al., “Layer 1/Layer 2 Control Channel Structure in
`Single-Carrier FDMA Based Evolved UTRA Uplink,” IEEE, 5
`pages, 2007.
`Kwak et al., “Degisn of CQI Channel Structure for Different/Large
`Sized Control Signals,” U.S. Appl. No. 60/944,074, ?led Jun. 14,
`2007, 14 pages.
`Motorola, “EUTRA-SC-FDMA Uplink Pilot/References Signal
`Design,” R1-063057, 3GPP RAN WG1 #47, Agenda Item 6.4.2,
`Riga, Latvia, Nov. 6-10, 2006, 5 pages.
`Nokia, “Multiplexing of L1/L2 Control Signaling when UE has no
`data to transmit,” R1-063380, 3GPP TSG RAN WG1 #47, Agenda
`Item 6.12.1, Riga, Latvia, Nov. 6-10, 2006, 6 pages.
`Nokia Siemens Network, Nokia, “Randomization for ACK/NACK
`signals transmitted on PUCCH,” R1 -073005, 3GPP TSG RAN WG1
`Meeting #49bis, Orlando, Fla, Jun. 25-29, 2007, 4 pages.
`Notice of Reason for Rejection mailed Jan. 19, 2010, in correspond
`ing Japanese Patent Application 2009-519168.
`Panasonic, “Signaling parameters for UL ACK/NACK resources,”
`R1-073616, 3GPP TSG RAN WG1 Meeting #50, Athens, Aug.
`20-24, 2007, pp. 1-3.
`
`* cited by examiner
`
`BlackBerry Exhibit 1001, pg. 2
`
`

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`

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`US 8,199,792 B2
`
`1
`RADIO COMMUNICATION APPARATUS AND
`RESPONSE SIGNAL SPREADING METHOD
`
`TECHNICAL FIELD
`
`The present invention relates to a radio communication
`apparatus and a reference signal generating method.
`
`BACKGROUND ART
`
`2
`domain, or different Walsh sequences. Here, the sequence
`length of ZC sequences in the time domain is 12, so that it is
`possible to use twelve ZC sequences with cyclic shift values
`“0” to “11”, generated by cyclically shifting the same ZC
`sequence using the cyclic shift values “0” to “11”. Also, the
`sequence length of Walsh sequences is 4, so that it is possible
`to use four different Walsh sequences. Therefore, in an ideal
`communication environment, it is possible to code-multiplex
`maximum forty-eight (12><4) response signals from mobile
`stations.
`Here, there is no cross-correlation between ZC sequences
`with different cyclic shift values generated from the same ZC
`sequence. Therefore, in an ideal communication environ
`ment, as shown in FIG. 2, a plurality of response signals
`subjected to spreading and code-multiplexing by ZC
`sequences with different cyclic shift values (0 to 11), can be
`separated in the time domain without inter-code interference,
`by correlation processing in the base station.
`However, due to an in?uence of, for example, transmission
`timing difference in mobile stations, multipath delayed waves
`and frequency offsets, a plurality of response signals from a
`plurality of mobile stations do not always arrive at a base
`station at the same time. For example, as shown in FIG. 3, if
`the transmission timing of a response signal spread by the ZC
`sequence with cyclic shift value “0” is delayed from the
`correct transmission timing, the correlation peak of the ZC
`sequence with cyclic shift value “0” may appear in the detec
`tion window for the ZC sequence with cyclic shift value “1 .”
`Further, as shown in FIG. 4, if a response signal spread by the
`ZC sequence with cyclic shift value “0” has a delay wave, an
`interference leakage due to the delayed wave may appear in
`the detection window for the ZC sequence with cyclic shift
`value “1.” Therefore, in these cases, the separation perfor
`mance degrades between a response signal spread by the ZC
`sequence with cyclic shift value “0” and a response signal
`spread by the ZC sequence with cyclic shift value “1 .” That is,
`if ZC sequences, cyclic shift values of which are adjacent, are
`used, the separation performance of response signals may
`degrade.
`Therefore, up till now, if a plurality of response signals are
`code-multiplexed by spreading using ZC sequences, a suf?
`cient cyclic shift value difference (i.e. cyclic shift interval) is
`provided between the ZC sequences, to an extent that does not
`cause inter-code interference between the ZC sequences. For
`example, when the difference between the cyclic shift values
`of ZC sequences is 4, only three ZC sequences with cyclic
`shift values “0,” “4,” and “8” amongst twelve ZC sequences
`with cyclic shift values “0” to “11,” are used for the ?rst
`spreading of response signals. Therefore, if Walsh sequences
`with a sequence length of 4 are used for second spreading of
`response signals, it is possible to code-multiplex maximum
`twelve (3x4) response signals from mobile stations.
`Non-Patent Document 1: Multiplexing capability of Cle
`and ACK/NACKs form different UEs (ftp://ftp.3gpp.org/TS
`G_RAN/WG1_RL1/TSGR1i49/Docs/R1-072315.Zip)
`
`DISCLOSURE OF INVENTION
`
`Problems to be Solved by the Invention
`
`As described above, if a Walsh sequence with a sequence
`length of 4, (W0, W1, W2, W3), is used for second spreading,
`one response signal is allocated to each of four symbols (S0 to
`S3). Therefore, a base station that receives response signals
`from mobile stations needs to despread the response signals
`over a time period of four-symbols. On the other hand, if a
`mobile station moves fast, there is a high possibility that the
`
`25
`
`30
`
`35
`
`40
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`45
`
`In mobile communication, ARQ (Automatic Repeat
`Request) is applied to downlink data from a radio communi
`cation base station apparatus (hereinafter abbreviated to
`“base station”) to radio communication mobile station appa
`ratuses (hereinafter abbreviated to “mobile stations”). That is,
`mobile stations feed back response signals representing error
`detection results of downlink data, to the base station. Mobile
`stations perform a CRC (Cyclic Redundancy Check) of
`downlink data, and, if CRCIOK is found (i.e. if no error is
`found), feed back an ACK (ACKnowledgement), and, if
`20
`CRCING is found (i.e. if error is found), feed back a NACK
`(Negative ACKnowledgement), as a response signal to the
`base station. These response signals are transmitted to the
`base station using uplink control channels such as a PUCCH
`(Physical Uplink Control CHannel).
`Also, the base station transmits control information for
`reporting resource allocation results of downlink data, to
`mobile stations. This control information is transmitted to the
`mobile stations using downlink control channels such as
`L1/L2 CCHs (Ll/L2 Control CHannels). Each L1/L2 CCH
`occupies one or a plurality of CCEs (Control Channel Ele
`ments). If one L1/L2 CCH occupies a plurality of CCEs, the
`plurality of CCEs occupied by the L1/L2 CCH are consecu
`tive. Based on the number of CCEs required to carry control
`information, the base station allocates an arbitrary L1/L2
`CCH among the plurality of L1/L2 CCHs to each mobile
`station, maps the control information on the physical
`resources corresponding to the CCEs occupied by the L1/ L2
`CCH, and performs transmission.
`Also, to ef?ciently use downlink communication
`resources, studies are underway to associate CCEs with
`PUCCHs. According to this association, each mobile station
`can decide the PUCCH to use to transmit response signals
`from the mobile station, from the CCEs corresponding to
`physical resources on which control information for the
`mobile station is mapped.
`Also, as shown in FIG. 1, studies are underway to perform
`code-multiplexing by spreading a plurality of response sig
`nals from a plurality of mobile stations using ZC (Zadoff
`Chu) sequences and Walsh sequences (see Non-Patent Docu
`ment 1). In FIG. 1, (W0, W1, W2, W3) represents a Walsh
`sequence with a sequence length of 4. As shown in FIG. 1, in
`a mobile station, ?rst, a response signal of ACK or NACK is
`subject to ?rst spreading to one symbol by a ZC sequence
`(with a sequence length of 12) in the frequency domain. Next,
`the response signal subjected to ?rst spreading is subject to an
`IFFT (Inverse Fast Fourier Transform) in association with WO
`to W3. The response signal spread in the frequency domain by
`a ZC sequence with a sequence length of 12 is transformed to
`a ZC sequence with a sequence length of 12 by this IFFT in
`the time domain. Then, the signal subjected to the IFFT is
`subject to second spreading using a Walsh sequence (with a
`sequence length of 4). That is, one response signal is allocated
`to each of four symbols S0 to S3. Similarly, response signals of
`other mobile stations are spread using ZC sequences and
`Walsh sequences. Here, different mobile stations use ZC
`sequences with different cyclic shift values in the time
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`BlackBerry Exhibit 1001, pg. 18
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`US 8,199,792 B2
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`channel conditions between the mobile station and the base
`station change during the above four-symbol time period.
`Therefore, when there is a mobile station moving fast,
`orthogonality between Walsh sequences that are used for
`second spreading may collapse. That is, when there are
`mobile stations moving fast, inter-code interference is more
`likely to occur between Walsh sequences than between ZC
`sequences, and, as a result, the separation performance of
`response signals degrades.
`By the way, when some of a plurality of mobile stations
`moves fast and the rest of mobile stations are in a stationary
`state, the mobile stations in a stationary state, which are
`multiplexed with the mobile stations moving fast on the
`Walsh axis, are also in?uenced by inter-code interference.
`It is therefore an object of the present invention to provide
`a radio communication apparatus and reference signal gen
`erating method that can minimize degradation of the separa
`tion performance of response signals that are code-multi
`plexed.
`
`Means for Solving the Problem
`
`The radio communication apparatus of the present inven
`tion employs a con?guration having: a ?rst spreading section
`that performs ?rst spreading of a response signal using one of
`a plurality of ?rst sequences that can be separated from each
`other because of different cyclic shift values; and a second
`spreading section that performs second spreading of the
`response signal subjected to the ?rst spreading, using one of
`a plurality of second sequences, and in which a difference
`between cyclic shift values of ?rst sequences associated with
`different, adjacent second sequences, is less than a difference
`between cyclic shift values of ?rst sequences associated with
`the same second sequence.
`
`Advantageous Effect of Invention
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`According to the present invention, it is possible to mini
`mize degradation of the separation performance of response
`signals that are code-multiplexed.
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`
`BRIEF DESCRIPTION OF DRAWINGS
`
`FIG. 1 is a diagram showing a spreading method of
`response signals (prior art);
`FIG. 2 is a diagram showing correlation processing of
`response signals spread by ZC sequences (in the case of an
`ideal communication environment);
`FIG. 3 is a diagram showing correlation processing of
`response signals spread by ZC sequences (when there is a
`transmission timing difference);
`FIG. 4 is a diagram showing correlation processing of
`response signals spread by ZC sequences (when there is a
`delay wave);
`FIG. 5 is a block diagram showing the con?guration of a
`base station according to Embodiment l of the present inven
`tion;
`FIG. 6 is a block diagram showing the con?guration of a
`mobile station according to Embodiment l of the present
`invention;
`FIG. 7 is a diagram showing association between ZC
`sequences, Walsh sequences and PUCCHs according to
`Embodiment l of the present invention (variation 1);
`FIG. 8 is a diagram showing association between the ?rst
`sequences, second sequences and PUCCHs according to
`Embodiment l of the present invention;
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`FIG. 9 is a diagram showing association between ZC
`sequences, Walsh sequences and PUCCHs according to
`Embodiment l of the present invention (variation 2);
`FIG. 10 is a diagram showing association between ZC
`sequences, Walsh sequences and PUCCHs according to
`Embodiment l of the present invention (variation 3);
`FIG. 11 illustrates Walsh sequences according to Embodi
`ment 2 of the present invention;
`FIG. 12 is a diagram showing association between ZC
`sequences, Walsh sequences and PUCCHs according to
`Embodiment 2 of the present invention;
`FIG. 13 is a diagram showing association between ZC
`sequences, Walsh sequences and PUCCHs according to
`Embodiment 3 of the present invention (variation 1);
`FIG. 14 is a diagram showing association between ZC
`sequences, Walsh sequences and PUCCHs according to
`Embodiment 3 of the present invention (variation 2); and
`FIG. 15 is a diagram showing a spreading method of a
`reference signal.
`
`BEST MODE FOR CARRYING OUT INVENTION
`
`Embodiments of the present invention will be explained
`below in detail with reference to the accompanying drawings.
`(Embodiment 1)
`FIG. 5 illustrates the con?guration of base station 100
`according to the present embodiment, and FIG. 6 illustrates
`the con?guration of mobile station 200 according to the
`present embodiment.
`Here, to avoid complicated explanation, FIG. 5 illustrates
`components associated with transmission of downlink data
`and components associated with reception of uplink response
`signals to downlink data, which are closely related to the
`present invention, and illustration and explanation of the
`components associated with reception of uplink data will be
`omitted. Similarly, FIG. 6 illustrates components associated
`with reception of downlink data and components associated
`with transmission of uplink response signals to downlink
`data, which are closely related to the present invention, and
`illustration and explanation of the components associated
`with transmission of uplink data will be omitted.
`Also, in the following explanation, a case will be described
`where ZC sequences are used for ?rst spreading and Walsh
`sequences are used for second spreading. Here, for ?rst
`spreading, it is equally possible to use sequences, which can
`be separated from each other because of different cyclic shift
`values, other than ZC sequences. Similarly, for second
`spreading, it is equally possible to use orthogonal sequences
`other than Walsh sequences.
`Further, in the following explanation, a case will be
`described where ZC sequences with a sequence length of 12
`and Walsh sequences with a sequence length of 4, (W0, W1,
`W2, W3), are used. However, the present invention is not
`limited to these sequence lengths.
`Further, in the following explanation, twelve ZC sequences
`with cyclic shift values “0” to “l 1” will be referred to as “ZC
`#0 ” to “ZC #11,” and four Walsh sequences of sequence
`numbers “0” to “3” will be referred to as “W #0” to “W #3.”
`Further, a case will be assumed in the following explana
`tion where L1/L2 CCH #1 occupies CCE #1, L1/L2 CCH #2
`occupies CCE #2,L1/L2 CCH #3 occupies CCE #3, L1/L2
`CCH #4 occupies CCE #4 and CCE #5, L1/L2 CCH #5
`occupies CCE #6 and CCE #7, L1/L2 CCH #6 occupies CCEs
`#8 to #11, and so on.
`Further, in the following explanation, the CCE numbers
`and the PUCCH numbers, which are de?ned by the cyclic
`shift values of ZC sequences and Walsh sequence numbers,
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`BlackBerry Exhibit 1001, pg. 19
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`US 8,199,792 B2
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`5
`are associated therebetween on a one to one basis. That is,
`CCE #1 is associated with PUCCH #1, CCE #2 is associated
`with PUCCH #2, CCE #3 is associated with PUCCH #3, and
`so on.
`In base station 100 shown in FIG. 5, control information
`generating section 101 and mapping section 104 receive as
`input a resource allocation result of downlink data.
`Control information generating section 101 generates con
`trol information to carry the resource allocation result, on a
`per mobile station basis, and outputs the control information
`to encoding section 102. Control information, which is pro
`vided per mobile station, includes mobile station ID informa
`tion to indicate to which mobile station the control informa
`tion is directed. For example, control information includes, as
`mobile station ID information, a CRC masked by the ID
`number of the mobile station, to which control information is
`reported. Control information is encoded in encoding section
`102, modulated in modulating section 103 and received as
`input in mapping section 104, on a per mobile station basis.
`Further, control information generating section 101 allocates
`an arbitrary L1/L2 CCH in a plurality of L1/ L2 CCHs to each
`mobile station, based on the number of CCE(s) required to
`report the control information, and outputs the CCE number
`corresponding to the allocated L1/L2 CCH to mapping sec
`tion 104. For example, when the number of CCE(s) required
`to report control information to mobile station #1 is one and
`therefore L1/L2 CCH #1 is allocated to mobile station #1,
`control information generating section 101 outputs CCE
`number #1 to mapping section 104. Also, when the number of
`CCE(s) required to report control information to mobile sta
`tion #1 is four and therefore L1/L2 CCH #6 is allocated to
`mobile station #1, control information generating section 101
`outputs CCE numbers #8 to #11 , to mapping section 104.
`On the other hand, encoding section 105 encodes transmis
`sion data for each mobile station (i.e. downlink data) and
`outputs the encoded transmission data to retransmission con
`trol section 106.
`Upon initial transmission, retransmission control section
`106 holds the encoded transmission data on a per mobile
`station basis and outputs the data to modulating section 107.
`Retransmission control section 106 holds transmission data
`until retransmission control section 106 receives as input an
`ACK of each mobile station from deciding section 116. Fur
`ther, upon receiving as input a NACK of each mobile station
`from deciding section 116, that is, for retransmission, retrans
`mission control section 106 outputs the transmission data
`associated with that NACK to modulating section 107.
`Modulating section 107 modulates the encoded transmis
`sion data received as input from retransmission control sec
`tion 106, and outputs the result to mapping section 104.
`For transmission of control information, mapping section
`104 maps the control information received as input from
`modulating section 103 on a physical resource based on the
`CCE number received as input from control information gen
`erating section 101, and outputs the result to IFFT section
`108. That is, mapping section 104 maps control information
`on the subcarrier corresponding to the CCE number in a
`plurality of subcarriers comprised of an OFDM symbol, on a
`per mobile station basis.
`On the other hand, for transmission of downlink data,
`mapping section 104 maps the transmission data, which is
`provided on a per mobile station basis, on a physical resource
`based on the resource allocation result, and outputs the result
`to IFFT section 108. That is, based on the resource allocation
`result, mapping section 104 maps transmission data on a
`subcarrier in a plurality of subcarriers comprised of an
`OFDM symbol, on a per mobile station basis.
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`IFFT section 108 generates an OFDM symbol by perform
`ing an IFFT of a plurality of subcarriers on which control
`information or transmission data is mapped, and outputs the
`OFDM symbol to CP (Cyclic Pre?x) attaching section 109.
`CP attaching section 109 attaches the same signal as the
`signal at the tail end part of the OFDM symbol, to the head of
`the OFDM symbol as a CP.
`Radio transmitting section 110 performs transmission pro
`cessing such as D/A conversion, ampli?cation and up-con
`version on the OFDM symbol with a CP, and transmits the
`result from antenna 111 to mobile station 200 (in FIG. 6).
`On the other hand, radio receiving section 112 receives a
`response signal transmitted from mobile station 200, via
`antenna 111, and performs receiving processing such as
`down-conversion and ND conversion on the response signal.
`CP removing section 113 removes the CP attached to the
`response signal subjected to receiving processing.
`Despreading section 114 despreads the response signal by
`a Walsh sequence that is used for second spreading in mobile
`station 200, and outputs the despread response signal to cor
`relation processing section 115.
`Correlation processing section 115 ?nds the correlation
`value between the response signal received as input from
`dispreading section 114, that is, the response signal spread by
`a ZC sequence, and the ZC sequence that is used for ?rst
`spreading in mobile station 200, and outputs the correlation
`value to deciding section 116.
`Deciding section 116 detects a correlation peak on a per
`mobile station basis, using a detection window set per mobile
`station in the time domain, thereby detecting a response sig
`nal on a per mobile station basis. For example, upon detecting
`a correlation peak in detection window #1 for mobile station
`#1, deciding section 116 detects the response signal from
`mobile station #1. Then, deciding section 116 decides
`whether the detected response signal is an ACK or NACK,
`and outputs the ACK or NACK to retransmission control
`section 106 on a per mobile station basis.
`On the other hand, in mobile station 200 shown in FIG. 6,
`radio receiving section 202 receives the OFDM symbol trans
`mitted from base station 100, via antenna 201, and performs
`receiving processing such as down-conversion and ND con
`version on the OFDM symbol.
`CP removing section 203 removes the CP attached to the
`OFDM symbol subjected to receiving processing.
`FFT (Fast Fourier Transform) section 204 acquires control
`information or downlink data mapped on a plurality of sub
`carriers by performing a FFT of the OFDM symbol, and
`outputs the control information or downlink data to extracting
`section 205.
`For receiving the control information, extracting section
`205 extracts the control information from the plurality of
`subcarriers and outputs it to demodulating section 206. This
`control information is demodulated in demodulating section
`206, decoded in decoding section 207 and received as input in
`deciding section 208.
`On the other hand, for receiving downlink data, extracting
`section 205 extracts the downlink data directed to the mobile
`station from the plurality of subcarriers, based on the resource
`allocation result received as input from deciding section 208,
`and outputs the downlink data to demodulating section 210.
`This downlink data is demodulated in demodulating section
`210, decoded in decoding section 211 and received as input in
`CRC section 212.
`CRC section 212 performs an error detection of the
`decoded downlink data using a CRC, generates anACK in the
`case of CRCIOK (i.e. when no error is found) and a NACK in
`the case of CRCING (i.e. when error is found), as a response
`
`BlackBerry Exhibit 1001, pg. 20
`
`

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`US 8,199,792 B2
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