WO2011132849A2 - Method and device for transmitting control information in a wireless communication system - Google Patents

Abstract

The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and a device for transmitting control information through a PUCCH in a wireless communication system, and comprises the following steps: receiving one or more modulation symbols from the control information; diffusing each of the modulation symbols to a plurality of subcarriers in the PUCCH; diffusing each of the modulation symbols diffused to the plurality of subcarriers to single carrier frequency division multiple access (SC-FDMA) symbols; and transmitting the one or more diffused modulation symbols through the PUCCH, wherein the number of modulation symbols that are transmitted through the PUCCH varies based on the number of SC-FDMA symbols for transmitting the PUCCH.

Description

 【Specification】

 [Name of invention]

 Method and apparatus for transmitting control information in wireless communication system

 Technical Field

 The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting control information. The wireless communication system can support carrier aggregation (CA).

 Background Art

 Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data. In general, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (0FDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.

 [Detailed Description of the Invention]

 [Technical problem]

 An object of the present invention is to provide a method and an apparatus therefor for efficiently transmitting control information in a wireless communication system. Another object of the present invention is to provide a channel format, a signal processing, and an apparatus therefor for efficiently transmitting control information. Another object of the present invention is to provide a method for efficiently allocating resources for transmitting control information and an apparatus therefor.

Technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description. [Technical solution] According to an aspect of the present invention, a method for transmitting control information through a physical uplink control channel (PUCCH) by a terminal in a wireless communication system, the method comprising: obtaining one or more modulation symbols from the control information; Spreading each modulation symbol into a plurality of subcarriers in the PUCCH; Spreading each modulation symbol spread over the plurality of subcarriers into a plurality of single carrier frequency division multiple access (SC-FDMA) symbols in the PUCCH; And transmitting the one or more spread modulation symbols on the PUCCH, wherein the number of modulation symbols transmitted on the PUCCH varies according to the number of SC-FDMA symbols for PUCCH transmission. This is provided.

 In another aspect of the present invention, a physical uplink (PUCCH) in a wireless communication system

A terminal configured to transmit control information through a control channel, comprising: a radio frequency (RF) unit; And a processor, wherein the processor obtains one or more modulation symbols from the control information, spreads each modulation symbol to a plurality of subcarriers in the PUCCH, and each modulation symbol spread to the plurality of subcarriers in the PUCCH. Spread to a plurality of single carrier frequency division multiple access (SC-FDMA) symbols, and transmit the one or more spread modulation symbols on the PUCCH, and the number of modulation symbols transmitted on the PUCCH is for the PUCCH transmission. A terminal, which varies according to the number of SC-FDMA symbols, is provided.

 Here, when the number of SC-FDMA symbols for the PUCCH transmission is N, a plurality of modulation symbols are transmitted through the last slot of the PUCCH, the number of SC-FDMA symbols for the PUCCH transmission is N-1 In this case, one modulation symbol is transmitted through the last slot of the PUCCH, and N may be 7 for a standard CP and 6 for an extended CP.

Here, when the number of SC-FDMA symbols for the PUCCH transmission is N, two modulation symbols are transmitted through the last slot of the PUCCH, the number of SC-FDMA symbols for the PUCCH transmission is N-1 In this case, one modulation symbol may be transmitted through the last slot of the PUCCH. Here, when the number of SC-FDMA symbols for the PUCCH transmission is N, the plurality of modulation symbols are spread to a plurality of SC-FDMA symbols using a code of Spreading? 3 01 ^" ) = 1«, respectively. When the number of SC—FDMA symbols for PUCCH transmission is N-1, the one modulation symbol may be spread into a plurality of SC-FDMA symbols using a code of SF = M + 1. M may be two.

 Advantageous Effects

 According to the present invention, control information can be efficiently transmitted in a wireless communication system. In addition, a channel format and a signal processing method for efficiently transmitting control information can be provided. In addition, it is possible to efficiently allocate resources for transmission of control information. Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

 [Brief Description of Drawings]

 example. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the invention, provide examples of the invention and, together with the description, describe the technical mapping of the invention.

 1 illustrates physical channels used in a 3GPP LTE system, which is an example of a wireless communication system, and a general signal transmission method using the same.

 2 illustrates an uplink signal processing procedure.

 3 illustrates a downlink signal processing process.

 4 illustrates the SC—FDMA scheme and the 0FDMA scheme.

 5 illustrates a signal mapping scheme in the frequency domain to satisfy a single carrier characteristic.

 6 illustrates a signal processing procedure in which DFT process output samples are mapped to a single carrier in cluster SC—FDMA.

7 and 8 illustrate a signal processing procedure in which DFT process output samples are mapped to multi-carriers in a cluster SC-FDMA. 9 illustrates a signal processing procedure in segment SC-FDMA.

 10 illustrates a structure of an uplink subframe.

 11 illustrates a signal processing procedure for transmitting a reference signal (RS) in uplink.

 12A and 12B illustrate a demodulation reference signal (DMRS) structure for a PUSCH.

 13-14 illustrate slot level structures of the PUCCH formats la and lb.

 15 through 16 illustrate a slot level structure of the PUCCH format 2 / 2a / 2b.

 17 illustrates ACK / NACK channelization for PUCCH formats la and lb.

 18 illustrates channelization for a mixed structure of PUCCH format 1 / la / lb and format 2 / 2a / 2b in the same PRB.

 19 illustrates PRB allocation for PUCCH transmission.

 20 illustrates a concept of managing a downlink component carrier at a base station. 21 illustrates a concept of managing an uplink component carrier in a terminal. 22 illustrates a concept in which one MAC manages multicarriers in a base station. 23 illustrates a concept in which one MAC manages multicarriers in a terminal. 24 illustrates a concept in which one MAC manages multicarriers in a base station. 25 illustrates a concept in which a plurality of MACs manage a multicarrier in a terminal. 26 illustrates a concept in which a plurality of MACs manage a multicarrier in a base station. 27 illustrates a concept in which one or more MACs manage a multicarrier from a reception point of a terminal.

 28 illustrates asymmetric carrier merging with a plurality of DL CCs and one UL CC linked. 29 to 30 illustrate examples of applying a spreading factor (SF) reduction to slot 0 of a subframe.

 31 to 32 show an example in which SF reduction is applied to a shortened PUCCH format.

33 to 34 illustrate a method of increasing multiplexing capacity in a shortened PUCCH format when SF reduction is applied according to an embodiment of the present invention. 35 through 36 illustrate a method of increasing multiplexed capacity in a shortened PUCCH format when SF reduction is applied according to an embodiment of the present invention.

 37 illustrates a base station and a terminal that can be applied to the present invention.

 [Form for conducting invention]

 The following techniques are code division multiple access (CDMA), frequency division mult access (FDMA), time division multiple access (TDMA), or t hogona 1 frequency division multiple access (OFDMA), and single carrier frequency division multiple (SC-FDMA) It can be used in various wireless access systems such as access). CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). 0FDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA). UTRA is part of UMTS Universal Mobile 61 ^ 0 隱 1 ^^ 10113 System. 3rd Generation Partnership Project (3GPP) LTEdong term evolution (3GPP) is part of Evolved UMTS (E-UMTS) using E-UTRA and LTE_A (Advanced) is an evolved version of 3GPP.LTE. For clarity, the following description will focus on 3GPP LTE / LTE-A, but the technical spirit of the present invention is not limited thereto.

 In a wireless communication system, a terminal receives information through a downlink (DL) from a base station, and the terminal transmits the information through an uplink (UL) to a base station. The information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist according to the type / use of the information they transmit and receive.

 FIG. 1 is a diagram for explaining physical channels used in a 3GPP LTE system and a general signal transmission method using the same.

When the power is turned off again or a new cell enters the cell, the initial cell search operation such as synchronizing with the base station is performed in step S101. For this purpose, the terminal may transmit a primary synchronization channel (Primary) Receives a Synchronization Channel (P-SCH) and a Seamary Synchronization Ion Channel (S—SCH) to synchronize with a base station and obtain information such as a cell ID. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may receive a downlink reference signal (DL RS) in an initial cell search step to confirm a downlink channel state.

 After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S102. System information can be obtained.

 Subsequently, the terminal may perform a random access procedure as in steps S103 to S106 to complete the access to the base station. To this end, the UE transmits a preamble through a physical random access channel (PRACH) (S103), and a voice response message for the preamble through a physical downlink control channel and a physical downlink shared channel thereto. Can be received (S104). In case of contention-based random access, contention resolution procedures such as transmission of an additional physical random access channel (S105) and a physical downlink control channel and receiving a physical downlink shared channel (S106) can be performed. have.

 After performing the above-described procedure, the UE performs a physical downlink control channel / physical downlink shared channel reception (S107) and a physical uplink shared channel as a general uplink / downlink signal transmission procedure.

PUSCH / Physical Uplink Control Channel (PUCCH) transmission (S108) may be performed. The control information transmitted from the terminal to the base station is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK / NACKC Hybrid Automatic Repeat and reQuest Acknowledgement / Negative-ACK (SR), Scheduling Request (SR), Channel Quality Indication (CQ I), PMK Precoding Matrix Indication (RMK), RKRank Indication (RQ), and the like. UCI is typically through PUCCH Although transmitted, control information and traffic data may be transmitted through the PUSCH at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by a request / instruction of the network.

 2 is a diagram illustrating a signal processing procedure for transmitting a UL signal by the terminal.

 In order to transmit the uplink signal, scrambling modules 210 of the terminal may scramble the transmission signal using the terminal specific scramble signal. The scrambled signal is input to the modulation mapper 220 to use Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), or 16QAM / 64QAM (Quadrature Amplitude Modulation) scheme, depending on the type of the transmitted signal and / or the channel state. Is modulated into a complex symbol. After the modulated complex symbol is processed by the transform precoder 230, it is input to the resource element mapper 240, and the resource element mapper 240 may map the complex symbol to a time-frequency resource element. The processed signal may be transmitted to the base station through the antenna via the SC-FDM signal generator 250.

 3 is a diagram for describing a signal processing procedure for transmitting a downlink signal by a base station.

 In the 3GPP LTE system, the base station may transmit one or more codewords in downlink. The codewords may each be processed into complex symbols via the scrambled mode 301 and the modulation mapper 302 as in the uplink of FIG. 2, after which the complex symbols may be processed by the layer mapper 303 into a plurality of layers ( Layer), and each layer may be multiplied by a precoding matrix by the precoding module 304 to be allocated to each transmit antenna. The transmitted signals for each antenna processed in this manner may be assigned to the resource element mapper 305, respectively. It is mapped to a time-frequency resource element and then transmitted through each antenna via a 0rthogonal frequency division multiple access (FDM) signal generator 306.

In a wireless communication system, when a terminal transmits a signal in uplink, a peak-to-average ratio (PAPR) is a problem as compared with a case in which a base station transmits a signal in downlink. Accordingly, the uplink signal as described above with reference to FIGS. 2 and 3. Unlike the 0FDMA scheme used for downlink signal transmission, SC-FDMA (Single Carrier-Frequency Division Multiple Access) scheme is used.

 4 is a diagram for explaining an SC-FDMA scheme and a 0FDMA scheme. The 3GPP system employs 0FDMA in downlink and SC-FDMA in uplink.

 Referring to FIG. 4, both a terminal for uplink signal transmission and a base station for downlink signal transmission include a serial-to-parallel converter (401), a subcarrier mapper (403), and an M-point IDFT module (404). ) And CP Cyclic Prefix) additional modules 406 are the same. However, the terminal for transmitting a signal in the SC-FDMA method further includes an N-point DFT module 402. The N-point DFT modes 402 partially offset the IDFT processing impact of the M-point IDFT modes 404 so that the transmitted signal has a single carrier property.

 FIG. 5 is a diagram illustrating a signal mapping method in a frequency domain for satisfying a single carrier characteristic in the frequency domain. 5 (a) shows a localized mapping method. 5 (b) shows a distributed mapping scheme.

 Clustered SC—FDMA, a modified form of SC-FDMA, is described. Clustered SOFDMA skips DFT process output samples into sub-groups during subcarrier mapping and discontinuously maps them to the frequency domain (or subcarrier domain). .

6 is a diagram illustrating a signal processing procedure in which DFT process output samples are mapped to a single carrier in a cluster SC-FDMA. 7 and 8 illustrate a signal processing procedure in which DFT process output samples are mapped to multi-carriers in a cluster SC-FDMA. 6 illustrates an example of applying an intra-carrier cluster SC-FDMA, and FIGS. 7 and 8 correspond to an example of applying an inter-carrier cluster SC-FDMA. FIG. 7 illustrates a single IFFT block when subcarrier spacing between adjacent component carriers is aligned in a case where component carriers are contiguous in the frequency domain. Indicates the case of generating a signal through. FIG. 8 illustrates a case where a signal is generated through a plurality of IFFT blocks in a situation in which component carriers are allocated non-contiguous in the frequency domain.

 9 is a diagram illustrating a signal processing procedure of segmented SC—FDMA. Segment SC-FDMA uses the same number of IFFTs as any number of DFTs.

As the relationship between the DFT and the IFFT has a one-to-one relationship, it is simply an extension of the conventional SC-FDMA DFT spreading and the IFFT frequency subcarrier mapping configuration and may be referred to as NxSOFDMA or NxDFT-s-OFDMA. This specification collectively names them Segment SC-FDMA. Referring to FIG. 9, the segment SC-FDMA performs a DFT process on a group basis by grouping all time-domain modulation symbols into N (N is an integer greater than 1) groups to alleviate a single carrier characteristic condition.

 10 illustrates a structure of an uplink subframe.

 Referring to FIG. 10, an uplink subframe includes a plurality of slots (eg, two). The slot may include different numbers of SC-FDMA symbols according to CP Cyclic Prefix) length. For example, in case of a normal CP, a slot may include 7 SOFDMA symbols. The uplink subframe is divided into a data region and a control region. The data area includes a PUSCH and is used to transmit data signals such as voice. The control region includes a PUCCH and is used to transmit control information. The PUCCH includes RB pairs (eg m = 0, 1, 2, 3) located at both ends of the data region on the frequency axis (eg RB pair 7 at frequency mirrored locations). And hop the slot to the boundary. The uplink control information (ie, UCI) includes HARQ ACK / NACK, CQK Channel Quality Information (PMQPrecoding Matrix Indicator), RI (Rank Indication), and the like.

11 is a diagram illustrating a signal processing procedure for transmitting a reference signal in the uplink. Data is converted into a frequency domain signal through a DFT precoder, and then transmitted through IFFT after frequency mapping, while RS skips the process through the DF precoder. Specifically, immediately after the RS sequence is directly generated (S11) in the frequency domain, localization mapping (S12), IFFTCS13) process and cyclic prefix (Cyclic Prefix); CP is sequentially transmitted through the attaching process (S14).

RS sequence ^r " ⁽ ' ^{v) (} ") is the cyclic shift of the base sequence. ^It is defined by a and can be expressed as in Equation 1.

[Equation 1]

Where ^Msc is the length of the RS sequence, is the size of the resource block expressed in subcarriers, and m is ^1≤? « ^{≤ /} ^^ ^' . ^^ ^' indicates the maximum uplink transmission band.

The basic sequence ^F ",") is divided into several groups. "e {0,1_, 29} represents the group number, and ^V corresponds to the base sequence number within that group. Each group has one base sequence of length ^JkZ sc ^{= mi} s _C (i≤ m <^) (V = 0) and two basic sequences ( ^{ν = 0} Ί) of length- ^{S = mN} ^ ( ^{6≤m≤ N} ^ ^{X, lJL} ), within which the sequence group number ^W and The number ^V can vary with time. The definition of the basic sequence r'ιΑ (0 ") Λ" r _ν (^ M½ ^R ; ^S- \) depends on the sequence length.

A basic sequence with a length of more than 3 ^ _s can be defined as

^{For M} ^ ^{-i V} o, the basic sequence ^ ^ '_' ^ sc ^L ) is given by Equation 2 below.

[Equation 2] r _{u> v} (") = x _g (n mod), 0≤"<

Here, the q th root Zadoff-Chu sequence is Can be defined.

[Equation 3]

 Where q satisfies Equation 4 below.

 【Math

 RS

Here, the length ^Vzc of the ^{Zadoffschuchu} sequence is given by the largest prime number and rRS .. ^ RS

Therefore, ^N Z << ^M is satisfied.

 RB

 3N.

A basic sequence with length less than can be defined as First, for ^{Msc = Vsc} and ^M sc = ^ so, the basic sequence is given by Equation 5.

[Equation 5]

Here, the values of ^ (") for ^ ^ and ^Μ ^ ^{= 2Λ} ^ are given in the following Tables and Table 2, respectively.

Table 1 _/// O _s ss _o n _o sM _ld 6 ₁ 8z2noz AV ₇

CM

_/// O _s ss _o n _o sM _ld 6 ₁ 8z2noz AV ₇

29

1 1 1 1 3 1 3 1 3 1 3 1 1 3 1 3 3 3 1 1 1 1 3 Meanwhile, RS hopping will be described. Group hopping pattern gh ("s) and sequence shift pattern

The sequence group number U can be defined as shown in Equation 6 below.

【Math

Here, mod represents the modulo operation.

 There are 17 different hopping patterns and 30 different sequence shift patterns. Sequence group hopping may be enabled or disabled by a parameter that activates group hopping provided by a higher layer.

PUCCH and PUSCH have the same hopping pattern but may have different sequence shift patterns. Group hopping pattern

Is the same for PUSCH and PUCCH and the following equation

Is given by 7.

 [Equation 7]

 0 if group hopping is disabled

 7 Λ

^ ._ ₀ c (8 « _j . + I) -2 ^l mod 30 if group hopping is enabled where ^C ( ^Z ) corresponds to a pseudo-random sequence, pseudo-random

 cell

 N ID

 init ―

 30

The sequence generator can be initialized to at the beginning of each radio frame. Sequence shift pattern

Are different from each other between PUCCH and PUSCH.

/ ^■ PUCCH PUCCH ₌ ^ cell _mod30

For PUCCH, the sequence shift pattern ^{/ ss} is ^{/ ss} Given the PUSCH, for the PUSCH, the sequence shift pattern

■ PUSCH --PUCCH, _Α t _Λ

ss = ss + Δ ₈₈ ; mod 30 is given. A _SS G {0,1, consisting of a higher layer.

Hereinafter, sequence hopping will be described. Sequence hopping applies only to reference signals of length ≥6N _s .

 RS RB

For a reference signal of length ^{Msc <6 V} sc, the base sequence number ^v is given as ^v = ⁰ in the base sequence group. For a reference signal whose length _SC ≥ 6N _SC , the base sequence number in the base sequence group in slot ^ is given by Equation 8 below. .

 [Equation 8]

) if group hopping is disabled and sequence hopping is enabled

otherwise where ^{C (Z)} corresponds to a pseudo-random sequence, and the parameters that enable the sequence hopping provided by the higher layers determine whether sequence hopping is possible. Pseudo-Random Siemens Generator at the start of a radio frame

N rcell

 ID PUSCH

cinit = ^■ 2 ⁵ + / _s

 30

 Can be initialized.

 The reference signal for the PUSCH is determined as follows.

 PUSCH

Reference Signal Sequence for PUSCH

R ^S = M ^P画

Satisfied, ^sc satisfied Cyclic shift in slot 二 " _CS = (« D RS + ^W DMRS + «PRS)) ^m ° ^{d 12} and

Is given by 2. n (i)

 DMRS n (2)

Is a broadcast value, ^DMRS is given by uplink scheduling assignment, and "sO is a cell-specific cyclic shift value ᅳ" _P RSC " _s ) is the slot number" PR _S ("= ∑ _{i = 0} ^c ( ⁸ ^ + 0 ^■ 2

And are given by

(0 N ΪΖΓ pseudo-random sequence, ^c ( ⁷ ) is a cell-specific value. Pseudo-random sequence

 cell

 ID 5 / -PUSCH

init ― ^■十 / ss

 30

The generator can be initialized to at the start of the radio frame. Table 3 shows the cyclic shift fields in DCKDownlink Control Information format 0.

(2)

 Π

It is table indicating DMRS [Table 3]

The physical mapping method for the uplink RS in the PUSCH is as follows. Sieges the amplitude scaling factor

Multiplied by and used for the corresponding PUSCH in sequences starting with ^r ( ^u) Will map to the same set of Physical Resource Blocks (PRBs). As for ^{/ = 3} in the standard cyclic prefix, which is mapped to the for ^{/ = 2} extended cyclic prefix to the resource elements in the subframe ^, ⁷⁾ increase in the order of first, and then will be the order of slot number.

 3 ^

In summary, if the length is greater than ^sc , the ZC sequence is used with cyclic expansion, and if the length is less than ^sc , the computer-generated sequence is used. The cyclic shift is determined according to Sal—specific cyclic shift, terminal-specific cyclic shift and hopping pattern.

 12A shows a PUSCH for a normal cyclic prefix (normal CP)

FIG. 12B illustrates a demodulation reference signal (DMRS) structure, and FIG. 12B illustrates a DMRS structure for a PUSCH in case of an extended CP. Degree

In 12a, DMRS is transmitted through 4th and 11th SC-FDMA symbols. In FIG. 12b,

DMRS is transmitted on the third and ninth SC-FDMA symbols.

 13-16 illustrate a slot level structure of the PUCCH format. PUCCH includes the following format for transmitting control information.

 (1) Format 1: On-Off keying (00K) Modulation, used for scheduling request (SR)

 (2) Format la and Format lb: used for ACK / NACK (Acknowledgment / Negative Acknowledgment) transmission

 1) format la: BPSK ACK / NACK for one codeword

 2) Format lb: QPSK ACK / NACK [for two codewords [

 (3) Format 2: QPSK modulation, used for CQI transmission

 (4) Format 2a and Format 2b: used for simultaneous transmission of CQI and ACK / NACK

Table 4 shows a modulation scheme and the number of bits per subframe according to the PUCCH format. Table 5 shows the number of RSs per slot according to the PUCCH format. Table 6 is a table showing the SC-FDMA symbol position of the RS according to the PUCCH format. In Table 4, PUCCH formats 2a and 2b are This is the case for the standard circular transpose.

Table 4

[Table 5]

Table 6

Figure 13 shows the PUCCH formats la and lb in the case of standard cyclic prefix. 14 shows PUCCH formats la and lb in case of extended cyclic prefix. In the PUCCH formats la and lb, control information having the same content is repeated in a slot unit in a subframe. At each terminal

ACK / NACK signal is CG-CAZAC (Computer-Generated Constant Am litude Zero Auto)

Different cyclic shifts (CS) (frequency domain code) and orthogonal cover code (OC or OCC) of the sequence Domain spreading code). 0C includes, for example, Walsh / DFT orthogonal code. When the number of CSs is 6 and the number of 0Cs is 3, a total of 18 terminals may be multiplexed in the same PRB (Physical Resource Block) based on a single antenna. Orthogonal sequences w0, wl, w2, w3 may be applied in any time domain (after FFT modulation) or in any frequency domain (before FFT modulation).

 For SR and persistent scheduling, ACK / NACK resources composed of CS, 0C, and PRBCPhysical Resource Block (RC) may be given to the UE through RRC (Rad) Resource Control (RRC). For dynamic ACK / NACK and non-persistent scheduling, ACK / NACK resources may be implicitly given to the UE by the lowest CCE index of the PDCCH corresponding to the PDSCH.

 15 shows PUCCH format 2 / 2a / 2b in the case of standard cyclic prefix. 16 shows PUCCH format 2 / 2a / 2b in case of extended cyclic prefix. 15 and 16, in the case of a standard CP, one subframe includes 10 QPSK data symbols in addition to the RS symbol. Each QPSK symbol is spread in the frequency domain by the CS and then mapped to the corresponding SC-FDMA symbol. SC-FDMA symbol level CS hopping can be applied to randomize inter-sal interference. RS can be multiplexed by CDM using cyclic shift. For example, assuming that the number of available CSs is 12 or 6, 12 or 6 terminals may be multiplexed in the same PRB, respectively. In short, a plurality of terminals in PUCCH formats 1 / la / lb and 2 / 2a / 2b may be multiplexed by CS + 0C + PRB and CS + PRB, respectively.

 Orthogonal sequences (0C) of length -4 and length -3 for PUCCH format 1 / la / lb are shown in Tables 7 and 8 below.

Table 7 Len§lh-4 orthogonal sequences for PUGCH formats 1 / laf b

Table 8

Orthogonal sequences (0C) for RS in PUCCH format 1 / la / lb are shown in Table 9 below. Table 9

 la and lb

FIG. 17 shows ACK / NACK channelization for PUCCH formats la and lb It is a figure explaining. 17 corresponds to the case of ¾ ^.

 18 illustrates channelization for a mixed structure of PUCCH formats 1 / la / lb and formats 2 / 2a / 2b in the same PRB.

 Cyclic Shift (CS) hopping and Orthogonal Cover (0C) remapping can be applied as follows.

 (1) Symbol-Based Sal-Specific CS Hopping for Randomization of Inter-cell Interference

 (2) slot-level CS / 0C remapping

 1) for inter-cell interference randomization

 2) Slot based approach for mapping between ACK / NACK channel and resource (k)

Meanwhile, the resource n _r for PUCCH format 1 / la / lb includes the following combination.

(1) CS (= same as DFT orthogonal code at symbol level) (n _cs )

(2) 0C (orthogonal cover at slot level) (n _oc )

(3) Frequency RBCResource Block) (n _rb )

When the indices representing CS, 0C, and RB are ^' n _cs , n _oc , n _rb ^', respectively, the representative index n _r includes n _cs , n _oc , n _rb . n _{r satisfies} n _r = (n _cs , n _oc , n _rb ).

 The combination of CQI, PMI, RI, and CQI and ACK / NACK may be delivered through PUCCH format 2 / 2a / 2b. Reed Muller (RM) channel coding may be applied.

For example, channel coding for UL CQI in LTE system is described as follows.

The bit stream ᅳ ¹ is channel coded using the (20, A) RM code. Table 10 shows a basic sequence for the (20, A) code. ^{with αο}

"^ ⁴ — ¹ represents the Most Significant Bit (MSB) and the Last Significant Bit (LSB).

In the case of CP, the maximum information bit is 11 bits except for the case where CQI and ACK / NACK are simultaneously transmitted. After coding 20 bits using the RM code, QPSK modulation can be applied.

Before QPSK modulation, the coded bits can be scrambled. Table 10

The channel coding bits "0," 1, " ² ," ³ , "" ^ — i may be generated by Equation ₉ . [Equation 9]

Here, i = 0, 1, 2, ..., Bl is satisfied.

 Table 11 shows the UCKUplink Control Information field for wideband reporting (single antenna port, transmit diversity or open loop spatial multiplexing PDSCH) CQI feedback.

Table 11

12 indicates a UCI field for CQI and PMI feedback for a wideband, and performs the closed loop spatial multiplexing PDSCH transmission. report.

 Table 12

Table 13 shows a UCI field for RI feedback for wideband reporting.

 Table 13

19 illustrates PRB allocation. As shown in FIG. 19, the PRB may be used for PUCCH transmission in slot n _s .

 A multicarrier system or a carrier aggregation system refers to a system that aggregates and uses a plurality of carriers having a band smaller than a target bandwidth for wideband support. When a plurality of carriers having a band smaller than the target band is aggregated, the band of the aggregated carriers may be limited to the bandwidth used by the existing system for backward compatibility with the existing system. For example, the existing LTE system supports bandwidths of 1.4, 3, 5, 10, 15, and 20 MHz, and the LTE-Advanced (LTE-A) system improved from the LTE system only uses bandwidths supported by LTE. It can support bandwidth greater than 20MHz. Alternatively, a new bandwidth can be defined to support carrier aggregation regardless of the bandwidth used by the existing system. Multicarrier is a name that can be used commonly with carrier aggregation and bandwidth aggregation. In addition, carrier aggregation collectively refers to both contiguous and non-contiguous carrier merging.

20 illustrates a concept of managing downlink component carriers in a base station. FIG. 21 is a diagram illustrating a concept of managing uplink component carriers in a terminal. For convenience of explanation, hereinafter, the upper layers will be briefly described as MACs in FIGS. 20 and 21.

 22 illustrates a concept in which one MAC manages multicarriers in a base station. 23 illustrates a concept in which one MAC manages multicarriers in a terminal.

 22 and 23, one MAC manages and operates one or more frequency carriers to perform transmission and reception. Frequency carriers managed in one MAC do not need to be contiguous with each other, which is advantageous in terms of resource management. In FIG. 22 and 23, one PHY means one component carrier for convenience. Here, one PHY does not necessarily mean an independent radio frequency (RF) device. In general, one independent RF device means one PHY, but is not limited thereto, and one RF device may include several PHYs.

 24 illustrates a concept in which a plurality of MACs manages multicarriers in a base station. 25 illustrates a concept in which a plurality of MACs manage a multicarrier in a terminal. 26 illustrates another concept in which a plurality of MACs manages multicarriers in a base station. 27 illustrates another concept in which a plurality of MACs manage a multicarrier in a terminal.

 In addition to the structures illustrated in FIGS. 22 and 23, as shown in FIGS. 24 to 27, multiple carriers may control several carriers instead of one MAC.

As shown in FIGS. 24 and 25, each carrier may be controlled by a 1: 1 MAC, and as shown in FIGS. 26 and 27, each carrier is controlled by a 1: 1 MAC for each carrier and the rest is controlled. One or more carriers can be controlled by one MAC. The above system is a system including a plurality of carriers from 1 to N, and each carrier may be used adjacent or non-contiguous. This can be applied to the uplink / downlink without distinction. The TDD system is configured to operate N multiple carriers including downlink and uplink transmission in each carrier, and the FDD system is configured to use multiple carriers for uplink and downlink, respectively. In the case of the FDD system, asymmetrical carrier aggregation may be supported in which the number of carriers and / or the bandwidths of carriers merged in uplink and downlink are different.

 When the number of component carriers aggregated in the uplink and the downlink is the same, it is possible to configure all the component carriers to be compatible with the existing system. However, component carriers that do not consider compatibility are not excluded from the present invention.

 Hereinafter, for convenience of description, when the PDCCH is transmitted on the downlink component carrier # 0, the PDSCH is assumed to be transmitted on the downlink component carrier # 0. However, cross-carrier scheduling is performed. It is apparent that this PDSCH can be transmitted through another downlink component carrier by applying this. The term "component carrier" may be replaced with other equivalent terms (eg, cell).

 FIG. 28 illustrates a scenario in which uplink control information (UCI) is transmitted in a wireless communication system supporting carrier aggregation. For convenience, this example assumes that UCI is ACK / NACK (A / N). However, this is for convenience of description, and the UCI may include control information such as channel state information (eg, CQI, PMI, RI) and scheduling request information (eg, SR) without limitation.

28 illustrates asymmetric carrier merging with five DL CCs linked with one IL CC. The illustrated asymmetric carrier merging may be set in terms of UCI transmission. That is, the DLCC-ULCC linkage for UCI and the DLCC-ULCC linkage for data may be set differently. For convenience, assuming that one DL CC can transmit at most two codewords, the UL ACK / NACK bit also needs at least 2 bits. In this case, at least 10 bits of ACK / NACK bits are required to transmit ACK / NACK for data received through five DL CCs through one UL CC. In order to support the DTX state for each DL CC, at least 12 bits (= 5 ⁵ = 3125 = 11.61 bits) are required for ACK / NACK transmission. Since the conventional PUCCH format la / lb can send ACK / NACK up to 2 bits, such a structure cannot transmit increased ACK / NACK information. For convenience, the carrier aggregation is illustrated as an increase in the amount of UCI information. However, this situation may occur due to an increase in the number of antennas and the presence of a backhaul subframe in a TDD system and a relay system. Similar to ACK / NACK, even when transmitting control information associated with a plurality of DL CCs through one UL CC, the amount of control information to be transmitted is increased. For example, when it is necessary to transmit CQICQI / PMI / RI for a plurality of DL CCs, the UCI payload may increase. DLCC and ULCC may also be referred to as DLCell and UL Cell, respectively. In addition, the anchor DL CC and the anchor UL CC may be referred to as DL PCel 1 (UL) and UL PCell, respectively.

 The DL primary CC may be defined as a DL CC linked with an UL primary CC. Linkage here encompasses both implicit and explicit linkage. In LTE, one DL CC and one UL CC are uniquely paired. For example, a DL CC linked with an UL primary CC may be referred to as a DL primary CC by LTE pairing. You can think of this as an implicit linkage. Explicit linkage means that the network configures the linkage in advance and can be signaled through RRC. In the explicit linkage, a DL CC paired with a UL primary CC may be referred to as a primary DL CC. Here, the UL primary (or anchor) CC may be a UL CC on which the PUCCH is transmitted. Alternatively, the UL primary CC may be a UL CC through which UCI is transmitted through PUCCH or PUSCH. Alternatively, the DL primary CC may be configured through higher layer signaling. Alternatively, the DL primary CC may be a DL CC to which the UE performs initial access. In addition, a DL CC except for the DL primary CC may be referred to as a DL secondary CC. Similarly, the UL CC except for the UL primary CC may be referred to as a UL secondary CC.

DL-UL pairing may correspond to FDD only. Since TDD uses the same frequency, separate DL-UL pairing may not be defined. In addition, the DL-UL linkage may be determined from the UL linkage through the UL EARFCN information of SIB2. For example, the DL-UL linkage may be obtained through SIB2 decoding at initial connection and otherwise obtained through RRC signaling. Thus, only SIB2 linkage exists and other DL-UL pairing may not be explicitly defined. For example, in the 5DL: 1UL structure of FIG. 28, DL CC # 0 and UL CC # 0 have a SIB2 linkage relationship with each other, and the remaining DL CCs may have a SIB2 linkage relationship with other UL CCs not configured for the UE. Can be. Although some of the present specification has been described mainly for asymmetric carrier merging, this is for illustrative purposes and the present invention can be applied without limitation to various carrier merging scenarios including symmetric carrier merging.

 Embodiment: UCI transmission using spreading factor reduction Hereinafter, a scheme for efficiently transmitting increased uplink control information will be described with reference to the accompanying drawings. Specifically, a new PUCCH format / signal processing procedure / resource allocation method for transmitting augmented uplink control information is proposed. For the purpose of explanation, the PUCCH format proposed by the present invention is referred to as a PUCCH format 3 in view of a new PUCCH format, an LTE-A PUCCH format, or a PUCCH format 2 defined in existing LTE. The technical idea of the PUCCH packet proposed by the present invention can be easily applied to any physical channel (for example, PUSCH) capable of transmitting uplink control information using the same or similar scheme. For example, an embodiment of the present invention may be applied to a periodic PUSCH structure for periodically transmitting control information or an aperiodic PUSCH structure for aperiodically transmitting control information.

 The following figures and embodiments illustrate a case of using a UCI / RS symbol structure of PUCCH format 1 (standard CP) of the existing LTE as a subframe / slot level UCI / RS symbol structure applied to a PUCCH format according to an embodiment of the present invention. Explain mainly. However, the UCI / RS symbol structure of the subframe / slot level in the illustrated PUCCH format is defined for convenience of illustration and the present invention is not limited to the specific structure. In the PUCCH format according to the present invention, the number, location, etc. of UCI / RS symbols can be freely modified according to the system design. For example, the PUCCH format according to the embodiment of the present invention may be defined using the structure of the PUCCH format 2 / 2a / 2b of the existing LTE.

PUCCH format according to an embodiment of the present invention can be used to transmit any type / size of uplink control information. For example, the PUCCH format according to the embodiment of the present invention may transmit information such as HARQ ACK / NACK, CQI PMI RI, and these information may have a payload of any size. For convenience of description, the drawings and the embodiment will be described based on the case where the PUCCH format according to the present invention transmits ACK / NACK information. 29 to 30 illustrate examples of applying a spreading factor (SF) reduction to slot 0 in a subframe. FIG. 29 is a case of standard CP and FIG. 30 is a case of extended CP. This example shows a case where the SF value of 0C used in the PUCCH format of the existing LTE is reduced from 4 to 2. The basic signal processing is the same as described with reference to FIGS. 13 to 14. 29-30, information bits (e.g., ACK / NACK) are modulated (e.g., QPSK, 8PS, 16QAM,

64QAM, etc.) to convert to modulation symbols (symbols 0, 1). Then, the modulation symbol is multiplied with the base sequence r0, and then mapped to the SC-FDMA symbol through cyclic shift, OC Orthogonal Code) ([w0 wl]; [w2 w3]) of SF = 2, and IFFT conversion. . Where ro includes a base sequence of length 12. 0C includes Walsh cover or DFT code as defined in LTE. Depending on the implementation, [w0 wl] and [w2 w3] may be given independently of one another or may have the same value.

 Since the conventional LTE PUCCH format uses SF = 4, only one modulation symbol can be transmitted in one slot, and the same information is repeated in units of slots, and thus only one modulation symbol can be transmitted at the subframe level. Accordingly, the PUCCH format of the existing LTE could transmit up to 2 bits of ACK / NACK information during QPSK modulation. However, the PUCCH illustrated in FIGS. 29 and 30 may transmit two modulation symbols per slot due to SF reduction. In addition, when each slot transmits different information, up to four modulation symbols may be transmitted at the subframe level. Accordingly, the illustrated PUCCH format can transmit up to 8 bits of UCI (eg, ACK / NACK) in QPSK modulation.

 In contrast to the conventional LTE PUCCH structure, the aforementioned method of reducing SF = 2 is reduced by SF, where the multiplexing capacity is reduced. For example, PUCCH to LTE PUCCH

Assuming 4 _hift = ² , the multiplexing capacity is 18 (= 6 * 3 = (cyclic shift number) * (0C number)). Here, the reason why the multiplexing capacity of the LTE PUCCH is 18 instead of 24 (= 6 * 4) is because the total multiplexing capacity is limited by the number of 0Cs of RS. However, as described above, reducing the SF of 0C to SF = 2 reduces the multiplexing capacity to 12 (= 6 * 2). In this case, the multiplexing capacity of the PUCCH is limited to the multiplexing capacity of the UCI interval.

31 to 32 illustrate a case in which SF reduction is applied to a shortened PUCCH format. Indicates. FIG. 31 shows a case of a standard CP and FIG. 32 shows a case of an extended CP. The shortened PUCCH format is set in a subframe in which a Sounding Reference Signal (SRS) is transmitted, and the last SC—FDMA symbol of slot 1 is not used. Show teundeu PUCCH format is the last SC- FDMA symbol of the slot in the normal PUCCH format As illustrated hwangjeo may be understood as a ^", may be understood to be defined using less one SC-FDMA symbol from the slot 1 have.

 30 to 31, the last SC-FDMA symbol (symbol 6 or 5) is not used, w2 may be any element of 0C, or any real / complex value, or in particular 1. In this case, the multiplexing capacity becomes 6 (= 1 * 6) in the symbol 5 (or 4) section due to the puncturing of the symbol 6 (or 5). That is, the multiplexing capacity of the symbol 5 (or 4) interval is provided only by the cyclic shift. Since the total multiplexing capacity of the PUCCH is limited by the portion having the smallest multiplexing capacity, the total multiplexing capacity is reduced from 12 to 6 when using the non-shortened PUCCH format.

 Hereinafter, a method of solving the multiplexing capacity reduction problem occurring in the shortened PUCCH format is proposed. Since the problem of the shortened PUCCH format may occur in the second slot (ie, slot 1), the following description will be based on the second slot. In this case, SF = 2 may be applied to the UCI of slot 0 as illustrated in FIGS. 29 to 30. In addition, if the technical spirit of the present invention described with respect to the second slot is required, it is obvious that the first slot can also be applied.

 33 to 34 illustrate a method of increasing multiplexing capacity in a shortened PUCCH format when SF reduction is applied according to an embodiment of the present invention. This example illustrates a method of adjusting the UCI interval of slot 1. 33 illustrates a case of a standard CP and FIG. 34 illustrates a case of an extended CP.

33 to 34, SF = 2 may be applied to UCI in slot 0, while SF = 3 may be applied to UCI in slot 1. In this case, the OC (wO, wl, w2) applied to the UCI interval may use an orthogonal code of length 3, for example, a DFT code. In the RS section, a length 3 DFT code and a length 2 Walsh code can be applied to each of the standard CP and extended CP cases. have. Examples of orthogonal codes applicable to the UCI and RS intervals may refer to Table 9. According to this scheme, the multiplexing capacity of the UCI interval in slot 1 is increased from 6 to 18 (= 3 * 6). However, the total multiplexing capacity of the PUCCH is limited to 12 (= 6 * 2) by the UCI interval of slot 0. Thus, by the present scheme, the multiplexing capacity is reduced to 6 in SF = 2 shortened PUCCH format can be increased back to 12 (= 6 * 2).

 35 through 36 illustrate a method of increasing multiplexing capacity in a shortened PUCCH format when SF reduction is applied according to an embodiment of the present invention. This example illustrates a method of adjusting the position / number of RS symbols and UCI symbols in slot 1. Specifically, this example illustrates a method of maintaining SF at 2 by replacing a conventional RS symbol with a UCI (eg, A / N information) symbol. FIG. 35 illustrates a case of a standard CP and FIG. 36 illustrates a case of an extended CP.

 35-36, in the case of the standard CP case, although the SC-FDMA symbol 4 was originally an RS symbol in slot 1, SF = 2 may be maintained by replacing it with a UCI symbol. In the case of a standard CP, an orthogonal code of length 2 (eg, Walsh code) may be applied to an RS symbol. In the case of an extended CP, an orthogonal code of length 1 (substantially SF = 1) may be applied to an RS symbol. Through this scheme, the multiplexing capacity, which was 6 in FIGS. 31 to 32, may be extended to 12.

Although not shown, a description will be given of a method of not separately defining the shortened PUCCH format for SF reduction when the network uses the shortened PUCCH format for a specific UE. Basically, the shortened PUCCH format was introduced to enable simultaneous transmission of PUCCH (eg, ACK / NACK) and SRS from the viewpoint of one UE. In this case, a configuration related parameter of the shortened PUCCH format may be defined in LTE. In this case, the non-shortened PUCCH format (FIGS. 29 and 30) is used as it is, but an event for transmitting the first information and an event for transmitting the second information are simultaneously performed (i.e., in the same subframe). When it occurs, certain transmissions can be dropped (not sent) according to their priority. For example, when the first information is ACK / NACK and the second information is SRS, if the priority of the ACK / NACK is higher, the SRS may be dropped when the corresponding event occurs. This can be summarized as follows. The UE recognizes whether to use the shortened PUCCH format through signaling. The signaling may be LTE signaling (eg, RC signaling) or newly defined LTE-A signaling to accompany it.

 If the SRS transmission is not scheduled at the scheduled time (eg, subframe), the UCI can be transmitted using the PUCCH format shown in FIGS. 29 to 30.

 If UCI transmission and SRS transmission are scheduled at the same time (eg, subframe), UCI or SRS may be dropped according to priority. For example, when a transmission event between the SRS and the ACK / NACK collides, the SRS transmission may be dropped and ACK / NACK may be transmitted using a PUCCH format as shown in FIGS. 29 to 30.

 Through the above-described method, SF reduction transmission can be achieved without energy loss.

 37 illustrates a base station and a terminal that can be applied to an embodiment of the present invention. Referring to FIG. 37, a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120. Base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116. The processor 112 may be configured to implement the procedures and / or methods proposed in the present invention. The memory 114 is connected to the processor 112 and stores various pieces of information relating to the operation of the processor 112. The RF unit 116 is connected with the processor 112 and transmits and / or receives a radio signal. Terminal 120 includes a processor 122, a memory 124, and an RF unit 126. The processor 122 may be configured to implement the procedures and / or methods proposed in the present invention. The memory 124 is connected with the processor 122 and stores various information related to the operation of the processor 122. The RF unit 126 is connected with the processor 122 and transmits and / or receives a radio signal. The base station 110 and / or the terminal 120 may have a single antenna or multiple antennas.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, some components and / or It is also possible to combine the features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment or may be substituted for components or features of another embodiment. It is obvious that the embodiments can be constructed by combining claims that do not have an explicit citation in the claims or incorporated into new claims by post-application correction.

 In this document, embodiments of the present invention have been described mainly based on a signal transmission / reception relationship between a terminal and a base station. This transmission / reception relationship is extended / similarly to signal transmission / reception between the terminal and the relay or the base station and the relay. Certain operations described in this document as being performed by a base station may, in some cases, be performed by an upper node thereof. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like. In addition, the terminal is UE Jser Equipment),

It may be replaced with terms such as MS (Mobile Station), MSS (Mobile Subscriber Station). Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. For implementation in hardware, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs),

DSPDs (digital signal processing devices), PLDs (programmable logic devices),

Field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit is located inside or outside the processor, and is already known. Data may be exchanged with the processor by various means.

 It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit of the invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the scope of the invention are included in the scope of the invention.

 【Industrial Availability】

 The present invention can be used in a terminal, base station, or other equipment of a wireless mobile communication system. Specifically, the present invention can be applied to a method for transmitting uplink control information and an apparatus therefor.

Claims

[Range of request]

 [Claim 1]

 In a method of transmitting control information through a PUCOKPhysical Uplink Control Channel (PUCOK) in a wireless communication system,

 Obtaining one or more modulation symbols from the control information;

 Spreading each modulation symbol into a plurality of subcarriers in the PUCCH;

 Spreading each modulation symbol spread over the plurality of subcarriers into a plurality of single carrier frequency division multiple access (SC-FDMA) symbols in the PUCCH; And

 Transmitting the one or more spread modulation symbols on the PUCCH;

 The number of modulation symbols transmitted on the PUCCH is varied according to the number of SC-FDMA symbols for PUCCH transmission.

 [Claim 2]

 The method of claim 1,

 When the number of SC-FDMA symbols for the PUCCH transmission is N, a plurality of modulation symbols are transmitted through the last slot of the PUCCH,

 If the number of SC-FDMA symbols for the PUCCH pre-shoot is N-1, one modulation symbol is transmitted through the last slot of the PUCCH,

 The N is 7 in the case of a standard CP, and 6 in the case of an extended CP, control information transmission method.

 [Claim 3]

 The method of claim 2,

 When the number of SC—FDMA symbols for PUCCH transmission is N, two modulation symbols are transmitted through the last slot of the PUCCH.

When the number of SC-FDMA symbols for PUCCH transmission is N-1, one modulation symbol is transmitted through the last slot of the PUCCH, control information Transmission method.

 [Claim 4]

 According to claim 12,

 When the number of SC—FDMA symbols for the PUCCH transmission is N, the plurality of modulation symbols are spread into a plurality of SOFDMA symbols by using a spreading factor (SF) = ¾1 code, respectively.

 When the number of SC-FIMA symbols for PUCCH transmission is N-1, the one modulation symbol is spread to a plurality of SC-FDMA symbols using a code of SF = M + 1, control information Transmission method.

 [Claim 5]

 The method of claim 4,

 M is 2, the control information transmission method.

 [Claim 6]

 A terminal configured to transmit control information through a PUCCH (Physi cal Upl Ink Control Channel) in a wireless communication system,

 RF (Radio Frequency) unit; And

 Including a processor,

 The processor obtains one or more modulation symbols from the control information, spreads each modulation symbol to a plurality of subcarriers in the PUCCH, and spreads each modulation symbol spread to the plurality of subcarriers in a plurality of SC-FDMAs in the PUCCH. A single carrier frequency diversity multi-access symbol, and transmits the one or more spread modulation symbols on the PUCCH;

 The number of modulation symbols transmitted on the PUCCH is variable according to the number of SC-FDMA symbols for PUCCH transmission.

 [Claim 7]

 The method of claim 6,

If the number of SC-FDMA symbols for the PUCCH transmission is N, the PUCCH A plurality of modulation symbols are sent through the last slot

 When the number of SC-FDMA symbols for PUCCH transmission is N-1, one modulation symbol is transmitted through the last slot of the PUCCH,

 The N is 7 in the case of a standard CP, it is 6 in the case of an extended CP, the terminal.

 [Claim 8]

 The method of claim 7, wherein

 If the number of SC-FDMA symbols for the PUCCH transmission is N, two modulation symbols are transmitted through the last slot of the PUCCH,

 In case that the number of SC-FDMA symbols for PUCCH transmission is N-1, one modulation symbol is transmitted through the last slot of the PUCCH.

 [Claim 9]

 The method of claim 7, wherein

 When the number of SC-FDMA symbols for the PUCCH transmission is N, the plurality of modulation symbols are spread to a plurality of SC—FDMA symbols using a code having a spreading factor (SF) = 1 «, respectively,

 If the number of SC-FDMA symbols for the PUCCH transmission is N-1, the one modulation symbol is spread to a plurality of SC-FDMA symbols using a code of SF 1 + 1, the terminal.

 [Claim 10]

 The method of claim 9,

 M is 2, the terminal.