(12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`
`9
`
`(l
`
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`PCT
`
`(43) International Publication Date
`19 July 2001 (19.01.2001)
`
`I IIII IIIIIII II IIIII IIIII IIIII IIIII IIII I II Ill lllll lllll lllll lllll lllll llll 1111111111111111111
`
`(10) International Publication Number
`WO 2007/081145 Al
`
`(51) International Patent Classification:
`H04J 11100 (2006.01)
`
`(21) International Application Number:
`PCT /KR2007 /00015 6
`
`(22) International Filing Date: 9 January 2007 (09.01.2007)
`
`(25) Filing Language:
`
`(26) Publication Language:
`
`English
`
`English
`
`(30) Priority Data:
`10-2006-0002192
`10-2006-0031632
`
`9 January 2006 (09.01.2006) KR
`6 April 2006 (06.04.2006) KR
`
`(71) Applicant: SAMSUNG ELECTRONICS CO., LTD.
`[KR/KR]; 416, Maetan-dong, Yeongtong-gu, Suwon-si,
`Gyeonggi-do 442-742 (KR).
`
`(72) Inventors: KWAK, Yong-Jun;
`#106-1508, Sam-
`sung 4-cha Apt., Pungdeokcheon 1-dong, Yongin-si,
`Gyeonggi-do 449-764 (KR). LEE, Ju-Ho; #730-304, Sal(cid:173)
`gugol Hyundai Apt., Yeongtong-dong, Yeongtong-gu, Su(cid:173)
`won-si, Gyeonggi-do 443-736 (KR). CHO, Joon-Young;
`#124-802, Hwanggolmaeul 1-danji Apt., Yeongtong-dong,
`Yeongtong-gu, Suwon-si, Gyeonggi-do 443-740 (KR).
`CHO, Yun-Ok; #205, 1234-3, Maetan-dong, Yeong(cid:173)
`tong-gu, Suwon-si, Gyeonggi-do 443-848 (KR).
`
`iiiiiiii
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`(74) Agent: LEE, Keon-Joo; Mihwa Bldg. 110-2, Myon(cid:173)
`gryun-dong 4-ga, Chongro-gu, Seoul 110-524 (KR).
`
`(81) Designated States (unless otherwise indicated, for every
`kind of national protection available): AE, AG, AL, AM,
`AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN,
`CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI,
`GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS,
`JP, KE, KG, KM, KN, KP, KZ, LA, LC, LK, LR, LS, LT,
`LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MY, MZ,
`NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RS, RU,
`SC, SD, SE, SG, SK, SL, SM, SV, SY, TJ, TM, TN, TR,
`TT, TZ, UA, UG, UZ, VC, VN, ZA, ZM, ZW.
`
`(84) Designated States (unless otherwise indicated, for every
`kind of regional protection available): ARIPO (BW, GH,
`GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM,
`ZW), Eurasian (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM),
`European (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, Fl,
`FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT,
`RO, SE, SI, SK, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA,
`GN, GQ, GW, ML, MR, NE, SN, TD, TG).
`
`Published:
`with international search report
`
`For two-letter codes and other abbreviations, refer to the "Guid(cid:173)
`ance Notes on Codes and Abbreviations" appearing at the begin(cid:173)
`ning of each regular issue of the PCT Gazette.
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`(54) Title: METHOD AND APPARATUS FOR TIME MULTIPLEXING UPLINK DATA AND UPLINK SIGNALING INFOR(cid:173)
`MATION IN AN SC-FDMA SYSTEM
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`(57) Abstract: Provided is a method and an apparatus for transmitting uplink information items having various characteristics by
`0
`using a single FFT block. The method includes determining if there is uplink signaling information to be transmitted when there is
`M uplink data to be transmitted; time multiplexing the uplink data and a first pilot for the uplink data and transmitting the multiplexed
`0 uplink data and first pilot, when there is no uplink signaling information; and time multiplexing the uplink data, the first pilot for
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`906
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`Bandwidth
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`: , the uplink data, and a second pilot for the uplink data and the uplink signaling information, and transmitting the multiplexed uplink
`;;, data, first pilot, and second pilot, when there is the uplink signaling information.
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`PCT /KR2007 /000156
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`METHOD AND APPARATUS FOR TIME MULTIPLEXING UPLINK
`DATA AND UPLINK SIGNALING INFORMATION IN AN SC-FDMA
`SYSTEM
`
`BACKGROUND OF THE INVENTION
`
`1. Field of the Invention
`The present invention relates to a method and an apparatus for
`transmitting/receiving uplink signaling information and uplink data in a
`Frequency Division Multiple Access (FDMA) wireless communication system
`using a single carrier.
`
`2. Description of the Related Art
`Recently, active research is being conducted in an Orthogonal Frequency
`Division Multiplexing (OFDM) scheme or a Single Carrier-Frequency Division
`Multiple Access (SC-FDMA) scheme similar to the OFDM scheme as a scheme
`available for high speed data transmission through a wireless channel in a mobile
`communication system.
`The OFDM scheme, which transmits data using multiple carriers, is a
`special type of a Multiple Carrier Modulation (MCM) scheme in which a serial
`symbol sequence is converted into parallel symbol sequences, and the parallel
`symbol sequences are modulated with a plurality of mutually orthogonal
`subcarriers ( or subcarrier channels) before being transmitted.
`FIG. 1 is a block diagram illustrating a structure of a transmitter of a
`typical OFDM system.
`Referring to FIG. 1, the OFDM transmitter includes a channel encoder
`101, a modulator 102, a serial-to-parallel converter 103, an Inverse Fast Fourier
`Transform (IFFT) block or a Digital Fourier Transform (DFT) block 104, a
`parallel-to-serial converter 105, and a Cyclic Prefix (CP) inserter 106.
`receives and channel-encodes an input
`The channel encoder 101
`infonnation bit sequence.
`In general, a convolutional encoder, a turbo encoder,
`or a Low Density Parity Check (LDPC) encoder is used as the channel encoder
`101. The modulator 102 modulates the channel-encoded bit sequence according
`to a modulation scheme, such as a Quadrature Phase Shift Keying (QPSK)
`scheme, 8PSK scheme, 16-ary Quadrature Amplitude Modulation (16QAM)
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`scheme, 64QAM, 256QAM, etc. Although not shown in FIG. 1, it is obvious
`that a rate matching block for performing repetition and puncturing may be
`inserted between the channel encoder 101 and the modulator 102.
`The serial-to-parallel converter 103 receives output data from the
`modulator 102 and converts the received data into parallel data. The IFFT block
`104 receives the parallel data output from the serial-to-parallel converter 103 and
`performs an IFFT operation on the parallel data. The data output from the IFFT
`block 104 is converted to serial data by the parallel-to-serial converter 105. The
`CP inserter 106 inserts a Cyclic Prefix (CP) into the serial data output from the
`parallel-to-serial converter 105, thereby generating an OFDM symbol to be
`transmitted.
`The IFFT block 104 converts the input data of the frequency domain to
`In the case of a typical OFDM system, because
`output data of the time domain.
`input data is processed in the frequency domain, a Peak to Average Power Ratio
`(PAPR) of the data may increase when the data has been converted into the time
`domain.
`The PAPR is one of the most important factors to be considered in the
`uplink transmission. As the PAPR increases, the cell coverage decreases, so that
`the signal power required by a User Equipment (UE) increases. Therefore, it is
`necessary to first reduce the PAPR, and it is thus possible to use an SC-FDMA
`scheme, which is a scheme modified from the typical OFDM scheme, for the
`It is possible to effectively reduce the PAPR
`OFDM-based uplink transmission.
`by enabling processing in the time domain without perfonning processing
`( channel encoding, modulation, etc.) of data in the frequency domain.
`FIG. 2 is a block diagram illustrating a structure of a transmitter in a
`system employing an SC-FDMA scheme, which is a typical uplink transmission
`scheme.
`Referring to FIG. 2, the SC-FDMA transmitter includes a channel encoder
`201, a modulator 202, a serial-to-parallel converter 203, a Fast Fourier Transform
`(FFT) block 204, a sub-carrier mapper 205, an IFFT block 206, a parallel-to-serial
`converter 207, and a CP inserter 208.
`The channel encoder 201 receives and channel-encodes an input
`information bit sequence. The modulator 202 modulates the output of the
`channel encoder 201 according to a modulation scheme, such as a QPSK scheme,
`an 8PSK scheme, a 16QAM scheme, a 64QAM scheme, a 256QAM scheme, etc.
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`A rate matching block (not shown) may be included between the channel encoder
`201 and the modulator 202.
`The serial-to-parallel converter 203 receives data output from the
`modulator 202 and converts the received data into parallel data. The FFT block
`204 performs an FFT operation on the data output from the serial-to-parallel
`converter 203, thereby converting the data into data of the frequency domain.
`The sub-carrier mapper 205 maps the output data of the FFT block 204 to the
`input of the IFFT block 206. The IFFT block 206 performs an IFFT operation
`on tne data output from the sub-carrier mapper 205. The output data of the IFFT
`block 206 is converted to parallel data by the parallel-to-serial converter 207.
`The CP inserter 208 inserts a CP into the parallel data output from the parallel-to(cid:173)
`serial converter 207, thereby generating an OFDM symbol to be transmitted.
`FIG. 3 is a block diagram illustrating in more detail the structure for
`resource mapping shown in FIG. 2. Hereinafter, the operation of the sub-carrier
`mapper 205 will be described with reference to FIG. 3.
`Referring to FIG. 3, data symbols 301 having been subjected to the
`channel encoding and modulation are input to an FFT block 302. The output of
`the FFT block 302 is input to an IFFT block 304. At this time, a sub-carrier
`mapper 303 maps the output data of the FFT block 302 to the input data of the
`IFFT block 304.
`The sub-carrier mapper 303 maps the information symbols of the
`frequency domain data converted by the FFT block 302 to corresponding input
`points or input taps of the IFFT block 304 so that the information symbols can be
`carried by proper sub-carriers.
`During the mapping procedure, if the output symbols of the FFT block
`302 are sequentially mapped to neighboring input points of the IFFT block 304,
`the output symbols are transmitted by sub-carriers that are consecutive in the
`This mapping scheme is referred to as a Localized
`frequency domain.
`Frequency Division Multiple Access (LFDMA) scheme.
`Further, when the output symbols of the FFT block 302 are mapped to
`input points of the IFFT block 304 having a predetermined interval between them,
`the output symbols are transmitted by sub-carriers having equal intervals between
`them in the frequency domain. This mapping scheme is referred to as either an
`Interleaved Frequency Division Multiple Access (IFDMA) scheme or a
`Distributed Frequency Division Multiple Access (DFDMA) scheme.
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`Although FIGs. 2 and 3 show one method of implementing the SC(cid:173)
`FDMA technology in the frequency domain, it is also possible to use various
`other methods, such as a method of implementing the technology in the time
`domain.
`Diagrams (a) and (b) of FIG. 4 illustrates comparison between the
`positions of sub-carriers used for the DFDMA and the LFDMA in the frequency
`domain.
`Referring to diagram (a) of FIG. 4, the transmission symbols of a UE
`using the DFDMA scheme are distributed with equal intervals over the entire
`frequency domain (that is, the system band). Referring to diagram (b) of FIG. 4,
`the transmission symbols of a UE using the LFDMA scheme are consecutively
`located at some part of the frequency domain.
`According to the LFDMA scheme, because consecutive parts of the entire
`frequency band are used, it is possible to obtain a frequency scheduling gain by
`selecting a partial frequency band having good channel gain in the frequency
`selective channel environment in which severe channel change of frequency
`bands occurs.
`In contrast, according to the DFDMA scheme, it is possible to
`obtain a frequency diversity gain as transmission symbols have various channel
`gains by using a large number of sub-carriers distributed over a wide frequency
`band.
`
`In order to maintain the characteristic of the single carrier as described
`above, simultaneously transmitted information symbols should be mapped to the
`IFFT block such that they can always satisfy the LFDMA or DFDMA after
`passing through a single FFT block (or DFT block).
`In an actual communication system, various information symbols may be
`transmitted. For example, in the uplink of a Long Term Evolution (LTE) system
`using the SC-FDMA based on a Universal Mobile Telecommunications System
`(UMTS), uplink data, control information regulating a transport scheme of the
`uplink data (which includes Transport Format (TF) information of the uplink data
`and/or Hybrid Automatic Repeat reQuest (HARQ) information), ACK/NACK for
`an HARQ operation for downlink data, Channel Quality Indication (CQI)
`information indicating the channel status reported to be used for scheduling of a
`node B, etc. may be transmitted. These enumerated information items have
`different transmission characteristics.
`Uplink data can be transmitted in a situation in which a UE has data in a
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`transmission buffer of the UE and has received permission for uplink
`transmission from a node B. The control information regulating the transport
`scheme of the uplink data is transmitted only when the uplink data is transmitted.
`Sometimes, uplink data may be transmitted without transmission of control
`In contrast, the ACK/NACK, which is transmitted in response to
`information.
`downlink data, has no relation to the transmission of the uplink data. That is,
`either both the uplink data and the ACK/NACK may be simultaneously
`transmitted or only one of them may be transmitted. Further, the CQI, which is
`transmitted at a given time, also has no relation to the transmission of the uplink
`data. That is, either both the uplink data and the CQI may be simultaneously
`transmitted or only one of them may be transmitted.
`As described above, various types of uplink information are transmitted
`in the SC-FDMA system. Under the restriction of use of a single FFT block,
`which is a characteristic of the single sub-carrier, it is necessary to effectively
`control the transmission of information in order to transmit various types of
`information as described above. That is to say, it is necessary to arrange a
`specific transmission rule for each of the cases where only uplink data is
`transmitted, where only ACK/NACK or CQI is transmitted, and where both
`uplink data and uplink signaling information (ACK/NACK or CQI) are
`transmitted.
`
`SUMMARY OF THE INVENTION
`
`Accordingly, the present invention has been made to solve the above-
`mentioned problems occurring in the prior art, and provides a method and an
`apparatus for transmitting various types of uplink information having various
`characteristics by using a single FFT block.
`The present invention also provides a method and an apparatus for time
`multiplexing uplink data and uplink signaling information.
`The present invention also provides a method and an apparatus for
`transmitting an additional pilot signal necessary for the transmission of uplink
`signaling information.
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`In order to accomplish this object, there is provided a method for
`transmitting multiple types of uplink information in a Single Carrier Frequency
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`Division Multiple Access (SC-FDMA) wireless communication system, the
`method including, when there is uplink data to be transmitted, determining if
`there is uplink signaling information to be transmitted; when there is no uplink
`signaling information, time-multiplexing the uplink data and a first pilot for the
`uplink data and transmitting the multiplexed uplink data and first pilot; and when
`there exists the uplink signaling infonnation, time-multiplexing the uplink data,
`the first pilot for the uplink data, and a second pilot for the uplink data and the
`uplink signaling information, and transmitting the multiplexed uplink data, first
`pilot, and second pilot.
`In accordance with another aspect of the present invention, there is
`provided an apparatus for transmitting multiple types of uplink information in a
`Single Carrier Frequency Division Multiple Access (SC-FDMA) wireless
`communication system,
`the apparatus
`including a multiplexer for
`time
`multiplexing uplink data and a first pilot for the uplink data when there is uplink
`data to be transmitted and there is no uplink signaling information, and time
`multiplexing the uplink data, the first pilot for the uplink data, and a second pilot
`for the uplink data and the uplink signaling information when there is both the
`uplink signaling information and the uplink signaling information; and a resource
`mapper for transmitting an output of the multiplexer after mapping the output of
`the multiplexer to a frequency resource.
`In accordance with another aspect of the present invention, there is
`provided a method for receiving multiple types of uplink information in a Single
`Carrier Frequency Division Multiple Access
`(SC-FDMA) wireless
`communication system, the method including receiving from a UE a radio signal
`through a frequency resource; time-demultiplexing the radio signal into uplink
`data related signal, a first pilot, uplink signaling related signal, and a second pilot;
`channel-compensating the uplink data related signal by using the first pilot;
`decoding the channel-compensated uplink data related signal and outputting
`uplink data; channel-compensating the uplink signaling related signal by using
`the second pilot; and decoding the channel-compensated uplink signaling related
`signal and outputting uplink signaling information.
`In accordance with another aspect of the present invention, there is provided an
`apparatus for receiving multiple types of uplink information in a Single Carrier
`Frequency Division Multiple Access (SC-FDMA) wireless communication
`system, the apparatus including a receiver block for receiving from a UE a radio
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`signal through a frequency resource; a first demultiplexer for time-demultiplexing
`the radio signal into uplink data related signal, a first pilot, uplink signaling
`related signal, and a second pilot; a first channel estimator/compensator for
`channel-compensating the uplink data related signal by using the first pilot; a first
`channel decoder for decoding the channel-compensated uplink data related signal
`and outputting uplink data; a second channel estimator/compensator for channel(cid:173)
`compensating the uplink signaling related signal by using the second pilot; and a
`second channel decoder for decoding the channel-compensated uplink signaling
`related signal and outputting uplink signaling information.
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The above and other objects, features and advantages of the present
`invention will be more apparent from the following detailed description taken in
`conjunction with the accompanying drawings, in which:
`FIG. 1 is a block diagram illustrating a structure of a transmitter of a
`typical OFDM system;
`FIG. 2 is a block diagram illustrating a structure of a transmitter in a
`system employing an SC-FDMA scheme, which is a typical uplink transmission
`scheme;
`FIG. 3 is a block diagram illustrating in more detail the structure for
`resource mapping shown in FIG. 2;
`FIG. 4is a diagram for comparing the positions of sub-carriers used for
`the DFDMA and the LFDMA in the frequency domain;
`FIG. 5 illustrates structures of an uplink transmission frame and its sub-
`frame of an LTE system;
`FIG. 6 illustrates frequency-time resources of an uplink transmission unit
`in an LTE system;
`FIG. 7
`is a signal flow diagram illustrating a process of signal
`transmission/reception between a node B and a UE;
`FIG. 8 illustrates use of frequency-time resources according to the present
`invention;
`FIG. 9 illustrate allocation of an additional pilot for uplink signaling
`information according to the present invention;
`FIG. 10 is a block diagram illustrating a structure of a transmitter
`according to the present invention;
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`FIG. 11 is a block diagram illustrating a structure of a receiver according
`to the present invention;
`FIG. 12 is a flow diagram of an operation of a transmitter according to the
`present invention;
`FIG. 13 is a flow diagram of an operation of a receiver according to the
`present invention;
`FIG. 14 illustrates a structure of a sub-frame including a pilot additionally
`used for the CQI according to the present invention;
`FIG. 15 is a block diagram illustrating a structure of a transmitter for
`time-multiplexing data and CQI according to the present invention;
`FIG. 16 illustrates a structure of a receiver for receiving a radio signal
`transmitted by a transmitter according to the present invention;
`FIG. 17 is a flow diagram of an operation of a transmitter according to the
`present invention; and
`FIG. 18 is a flow diagram of an operation of a receiver according to the
`present invention.
`
`DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
`
`Hereinafter, preferred embodiments of the present invention will be
`In the following
`described with reference to the accompanying drawings.
`description, a detailed description of known functions and configurations
`incorporated herein will be omitted when it may make the subject matter of the
`present invention rather unclear. Further, in the following description of the
`present invention, various specific definitions are provided only to help general
`understanding of the present invention, and it is apparent to those skilled in the art
`that the present invention can be implemented without such definitions.
`The present invention multiplexes different types of uplink information,
`so as to enable transmission of the uplink information, which can satisfy the
`single carrier characteristic in a wireless communication system using a Single
`Carrier Frequency Division Multiple Access (SC-FDMA) scheme.
`The
`following description discusses multiplexing for uplink transmission of uplink
`data, control information, ACK/NACK, CQI, etc. in an SC-FDMA wireless
`communication system. As used herein, the other information except for the
`uplink data and control information thereof, that is, information including
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`ACK/NACK and CQI, is referred to as "uplink signaling information."
`First, a Long Term Evolution (LTE) system, which is being standardized
`by the 3rd Generation Partnership Project (3GPP), is discussed in order to more
`clearly describe the present invention. The LTE system employs the SC-FDMA
`for uplink transmission. FIG. 5 illustrates structures of an uplink transmission
`frame and its sub-frame.
`In FIG. 5, reference numeral 501 denotes a radio frame, which is an
`uplink transmission unit and is defined to have a length of 10 ms. One radio
`frame 501 includes 20 sub-frames 502, each of which has a length of 0.5 ms.
`Further, each sub-frame 502 includes six Long Blocks (LBs) 503, 505, 506, 507,
`508 and 510, two Short Blocks (SBs) 504 and 509, and Cyclic Prefixes (CPs) 511
`and 512 located before the blocks. The LBs 503, 505, 506, 507, 508 and 510
`carry information except for pilot signals or pilots used as a reference for coherent
`modulation, and SBs 504 and 509 are used only to carry the pilots.
`FIG. 6 illustrates the sub-frame 502 of FIG. 5 on the time domain and the
`In FIG. 6, the horizontal axis indicates the frequency domain
`frequency domain.
`601 and the vertical axis indicates the time domain 602. The range of the
`frequency domain 601 corresponds to the entire frequency band 604 and the
`range of the time domain 602 corresponds to one sub-frame 603. As noted, the
`SBs 605 and 606 carry pilots, and the LBs 607 and 608 carry other information
`except for the pilots.
`As described above, uplink data transmitted according to resource
`allocation by a node B, control information in relation to the uplink data,
`ACK/NACK for indicating success or failure in reception of downlink data, CQI
`for
`indicating a channel status, scheduling request information, etc. are
`transmitted by using the uplink resources.
`Whether to transmit the uplink data is determined according to the
`scheduling of a node B, and a resource to be used is also determined according to
`the resource allocation by the node B. The control information transmitted
`together with the uplink data is also transmitted according to the resources
`allocated by the node B.
`In contrast, since the ACK/NACK is generated based
`on downlink data, the ACK/NACK is transmitted using an uplink resource
`automatically allocated according to whether or not the downlink data is
`transmitted, in response to the control channel defining the downlink data or the
`downlink data channel. Further, since it is usual that the CQI is periodically
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`transmitted, the CQI is transmitted using a resource determined in advance
`through setup by higher level signaling.
`A process for transmitting multiple types of uplink information will be
`described with reference to FIG. 7. FIG. 7 illustrates a process of signal
`transmission/reception between a node B and a UE.
`Referring to FIG. 7, for communication with the UE 705, the node B 701
`may transmit downlink data 704, downlink control information 703 defining a
`transform format of the downlink data 704, an uplink grant 702 for allocating an
`uplink resource of the UE according to a result of scheduling, etc. to the UE 705.
`In contrast, the UE 705 may transmit uplink data 707, and ACK/NACK 706 for
`supporting an HARQ operation of the downlink data 704 from the node B 701,
`etc. to the node B 701. Although not shown, the UE 705 may further transmit
`uplink signaling information such as CQI indicating the channel information.
`However, the following discussion is mainly based on a case in which
`ACK/NACK is
`transmitted as one of a representative uplink signaling
`information. Of course, control information for the uplink data may be also
`transmitted together with the uplink data 707. Further, the following discussion
`can be applied to not only the ACK/NACK but also other uplink signaling
`information such as CQI or scheduling request information.
`In step 711, the node B 701 transmits downlink control information 708·
`together with downlink data 709. The control information 708 and the downlink
`data 709 are transmitted at either exactly the same transmission time or nearly
`similar transmission time. After receiving the downlink control information 708,
`the UE 705 decodes the downlink data 709 based on the downlink control
`infonnation 708. Then, the UE 705 informs the node B 701 of if the decoding
`of the downlink data 709 was successful. Specifically, in step 715, the UE 705
`transmits NACK, which implies that the received dowp.link data has an error.
`In step 712, the node B 701 transmits the uplink grant 710, which is
`resource allocation information for uplink transmission of the UE 705. Upon
`receiving the uplink grant 710, the UE 705 transmits uplink data 714 together
`with control information through an uplink resource indicated by the uplink grant
`710 in step 716.
`The radio resource for transmitting the ACK/NACK 706 must be set in
`advance. Since the ACK/NACK 706 relates to the transmission of the downlink
`data 704, the ACK/NACK 706 is transmitted by using either an uplink radio
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`resource mapped to the downlink resource used by the downlink control
`information 703 or an uplink radio resource mapped to the downlink resource
`used by the downlink data 704. At this time, the mapping of the radio resource
`corresponding to the ACK/NACK 706 may change according to time, and it is
`possible to enable the node B to know the channel statuses corresponding to
`various sub-carriers, that is, corresponding to detailed frequency bands, by
`changing the sub-carrier(s) carrying the ACK/NACK 706.
`In contrast, because
`the uplink data 707 uses an uplink radio resource directly indicated by the uplink
`grant 702 transmitted in the downlink by the node B 701, the UE 705 recognizes,
`by using the uplink grant 702, the uplink radio resource to be used for the uplink
`data 707.
`When the NACK 713 and the uplink data 714 are transmitted at different
`transmission time as in steps 715 and 716, only one type of uplink information is
`transmitted at each transmission period. Therefore, the UE 705 can maintain
`without difficulty the single carrier characteristic of the uplink transmission.
`Upon receiving the NACK 713, the node B 701 retransmits downlink
`data 717 substantially equal to the downlink data 709 according to the HARQ
`In step 719, control information of the retransmitted
`operation in step 719.
`downlink data 717 is transmitted.
`In step 721, the UE 705 transmits ACK 720 in
`response to the retransmitted downlink data 717. Then, the HARQ operation for
`the downlink data 709 and 717 is terminated.
`In step 721 also, the. UE 705
`transmits only the ACK 720 without the uplink data. Therefore, the UE 705 can
`maintain without difficulty the single carrier characteristic of the uplink
`transmission.
`In contrast, if the node B 701 transmits the downlink control infonnation
`730 and the downlink data 731 nearly simultaneously with the uplink grant 732 in
`steps 733 and 734, the UE 705 uplink transmits the ACK/NACK 736 and the
`uplink data 735 substantially at the same time in steps 737 and 738. The radio
`resource for the ACK/NACK 736 is determined based on the downlink data 731
`or the downlink control information 730 and the radio resource for the uplink data
`735 is determined based on the uplink grant 732, and these radio resources are
`usually divided by the frequency side within one sub-frame. Therefore, in the
`case where the UE 705 must simultaneously transmit the uplink data 735 and the
`ACK/NACK 736, it is impossible to contain the two types of information 735 and
`736 in one FFT block and it is thus impossible to satisfy the single carrier
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`characteristic of the uplink transmission.
`In the uplink transmission, it should be always possible to transmit the
`ACK/NACK 706 and the uplink data 707 within each sub-frame for the flexibility
`of the downlink and uplink transmission. Therefore, according to the present
`invention, the ACK/NACK (that is, uplink signaling information) and the uplink
`data are time-multiplexed and transmitted within the same frequency resource, in
`order to always satisfy the single carrier characteristic of the uplink transmission
`regardless of the transmission of the ACK/NACK and the uplink data within one
`sub-frame, which is the minimum transmission unit.
`FIG. 8 illustrates a sub-frame structure for time-multiplexing the
`ACK/NACK and uplink data according to the present invention.
`In FIG. 8, the
`horizontal axis corresponds to the frequency domain 801, and the vertical axis
`corresponds to the time domain 802. The range of the frequency domain 801
`corresponds to the entire frequency band 804, and the range of the time domain
`802 corresponds to one sub-frame 803. As shown, short blocks 805 and 806
`carry pilots, and long blocks 807 carry uplink data and control information
`defining the transform format of the uplink data except for the pilots.
`resource
`The ACK/NACK
`is
`transmitted
`through
`a
`separate
`(ACK/NACK resource) 808 that is temporally discriminated from the resource
`( data resource) for the uplink data. The length of the time interval for the
`ACK/NACK may be the same as the size of each short block or the size of each
`long block, or may be another size. Further, the ACK/NACK resource may be
`variably determined according to the used frequency band, etc.
`Referring to FIG. 8, short blocks 805 and 806 carry pilots, which are used
`in channel estimation for radio resources ( data resources) of uplink data
`trans