KR20110117595A - Apparatus and method of transmitting control information in wireless communication system - Google Patents

Abstract

The present invention relates to a wireless communication system. In particular, the present invention relates to a method and apparatus for transmitting control information over a PUCCH in a wireless communication system, 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. And an apparatus therefor.

Description

Method and apparatus for transmitting control information in wireless communication system {APPARATUS AND METHOD OF TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM}

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).

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 (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system.

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. It is still another object of the present invention to provide a method for efficiently allocating resources for transmitting control information and an apparatus therefor.

The technical problems to be solved by the present invention are not limited to the technical problems and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

In one 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 terminal configured to transmit control information through a physical uplink control channel (PUCCH) in a wireless communication system, the terminal 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 is provided, which varies according to the number of SC-FDMA symbols.

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 into a plurality of SC-FDMA symbols by using a spreading factor (SF) = M, respectively, and the PUCCH When the number of SC-FDMA symbols for 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. In this case, M may be two.

According to the present invention, control information can be efficiently transmitted in a wireless communication system. In addition, it is possible to provide a channel format and a signal processing method for efficiently transmitting control information. 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 THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide examples of the present invention and together with the description, describe the technical mapping of the present 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 an SC-FDMA scheme and an OFDMA 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.
12 illustrates a demodulation reference signal (DMRS) structure for a PUSCH.
13 through 14 illustrate slot level structures of PUCCH formats 1a and 1b.
15-16 illustrate the slot level structure of PUCCH format 2 / 2a / 2b.
17 illustrates ACK / NACK channelization for PUCCH formats 1a and 1b.
18 illustrates channelization for a mixed structure of PUCCH formats 1 / 1a / 1b and formats 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 of applying SF reduction to a shortened PUCCH format.
33 through 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 multiplexing 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.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various radio access systems. 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). OFDMA 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 the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA and LTE-A (Advanced) is an evolved version of 3GPP LTE. For clarity of description, 3GPP LTE / LTE-A is mainly described, but the technical idea 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 the base station. The information transmitted and received between 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 transmitted and received.

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

The terminal which is powered on again or enters a new cell while the power is turned off performs an initial cell search operation such as synchronizing with the base station in step S101. To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains 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 check the downlink channel state.

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

Thereafter, the terminal may perform a random access procedure such as 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 response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. 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 reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) may be performed. .

After performing the procedure as described above, the UE performs a physical downlink control channel / physical downlink shared channel reception (S107) and a physical uplink shared channel (PUSCH) / as a general uplink / downlink signal transmission procedure. The 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 Hybrid Automatic Repeat and reQuest Acknowledgment / Negative-ACK (HARQ ACK / NACK), Scheduling Request (SR), Channel Quality Indication (CQI), Precoding Matrix Indication (PMI), Rank Indication (RI), and the like. UCI is generally transmitted through PUCCH, but may be transmitted through PUSCH when control information and traffic data should be transmitted at the same time. In addition, the UCI may be aperiodically transmitted through the PUSCH by the 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, the scrambling module 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 and uses a Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), or 16QAM / 64QAM (Quadrature Amplitude Modulation) scheme according to the type and / or channel state of the transmitted signal. Is modulated into a complex symbol. The modulated complex symbol is processed by the transform precoder 230 and then input to the resource element mapper 240, which can map the complex symbol to a time-frequency resource element. The signal thus processed may be transmitted to the base station through the antenna via the SC-FDMA 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 be processed into complex symbols through the scramble module 301 and the modulation mapper 302 as in the uplink of FIG. 2, respectively. Then, the complex symbols may be processed by the layer mapper 303 into a plurality of layers ( Layer, and each layer may be multiplied by the precoding matrix by the precoding module 304 and assigned to each transmit antenna. The transmission signal for each antenna processed as described above is mapped to a time-frequency resource element by the resource element mapper 305, and then transmitted through each antenna via an orthogonal frequency division multiple access (OFDM) signal generator 306. Can be.

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, as described above with reference to FIGS. 2 and 3, the uplink signal transmission uses the Single Carrier-Frequency Division Multiple Access (SC-FDMA) scheme differently from the OFDMA scheme used for the downlink signal transmission.

4 is a diagram for explaining an SC-FDMA scheme and an OFDMA scheme. The 3GPP system employs OFDMA 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 the Cyclic Prefix (CP) addition module 406 are the same. However, the terminal for transmitting a signal in the SC-FDMA scheme further includes an N-point DFT module 402. The N-point DFT module 402 partially offsets the IDFT processing impact of the M-point IDFT module 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. FIG. 5A illustrates a localized mapping scheme, and FIG. 5B illustrates a distributed mapping scheme.

Clustered SC-FDMA, a modified form of SC-FDMA, is described. Clustered SC-FDMA divides 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 shows 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 case in which a signal is generated through a single IFFT block when subcarrier spacing between adjacent component carriers is aligned in a situation in which component carriers are contiguous in the frequency domain. 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 a segmented SC-FDMA.

Segment SC-FDMA is simply an extension of the conventional SC-FDMA DFT spreading and IFFT frequency subcarrier mapping configuration as the number of IFFTs equal to the number of DFTs is applied and the relationship between DFT and IFFT is one-to-one. Sometimes referred to as -FDMA 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 a cyclic prefix (CP) length. For example, in case of a normal CP, a slot may include 7 SC-FDMA 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, Channel Quality Information (CQI), Precoding Matrix Indicator (PMI), and Rank Indication (RI).

FIG. 11 illustrates a signal processing procedure for transmitting a reference signal in uplink. Data is converted into a frequency domain signal through a DFT precoder, and then transmitted through the IFFT after frequency mapping, while RS skips the process through the DFT precoder. Specifically, after the RS sequence is immediately generated in the frequency domain (S11), the RS is sequentially transmitted through a localization mapping process (S12), an IFFT process (S13), and a cyclic prefix (CP) attachment process (S14). do.

는 기본 시퀀스(base sequence)의 순환 쉬프트(cyclic shift)

에 의해 정의되며 수학식 1과 같이 표현될 수 있다.RS sequence

Is a cyclic shift of the base sequence

It is defined by and can be expressed as Equation 1.

는 RS 시퀀스의 길이이고,

는 부반송파 단위로 나타낸 자원 블록의 크기이며, m은

이다.

는 최대 상향링크 전송 대역을 나타낸다.From here,

Is the length of the RS sequence,

Is the size of the resource block in subcarriers and m is

to be.

Denotes a maximum uplink transmission band.

는 몇 개의 그룹으로 구분된다.

는 그룹 번호를 나타내며,

는 해당 그룹 내의 기본 시퀀스 번호에 해당한다. 각 그룹은 길이가

(

)인 하나의 기본 시퀀스(

)와 길이가

(

)인 두 개의 기본 시퀀스(

)를 포함한다. 해당 그룹 내에서 시퀀스 그룹 번호

와 해당 번호

는 시간에 따라 각각 변할 수 있다. 기본 시퀀스

의 정의는 시퀀스 길이

에 따른다.The default sequence

Are divided into several groups.

Represents the group number,

Corresponds to the base sequence number in the group. Each group has a length

(

One base sequence ()

) And the length

(

Two basic sequences ()

). Sequence group number within that group

And its number

Can vary with time. Basic sequence

The definition of the sequence length

Follow.

이상의 길이를 가진 기본 시퀀스는 다음과 같이 정의할 수 있다.

Basic sequences with lengths above can be defined as follows:

에 대하여, 기본 시퀀스

는 다음의 수학식 2에 의해 주어진다.

With respect to the base sequence

Is given by the following equation.

Here, the q th root Zadoff-Chu sequence may be defined by Equation 3 below.

Here, q satisfies the following equation (4).

는 가장 큰 소수에 의해 주어지고 따라서,

를 만족한다.Where, the length of the Zadoff-Chu sequence

Is given by the largest prime number

.

미만의 길이를 가진 기본 시퀀스는 다음과 같이 정의될 수 있다. 먼저,

와

에 대해 기본 시퀀스는 수학식 5와 같이 주어진다.

A base sequence with length less than may be defined as follows. first,

Wow

The basic sequence for is given by Equation 5.

와

에 대한

의 값은 다음의 표 1과 표 2로 각각 주어진다.From here,

Wow

For

The values of are given in Tables 1 and 2, respectively.

Meanwhile, the RS hopping will be described.

과 시퀀스 시프트(sequence shift) 패턴

에 의해 슬롯

에서 시퀀스 그룹 번호 는 다음의 수학식 6과 같이 정의할 수 있다.Group hopping pattern

And sequence shift patterns

By slot

Sequence group number May be defined as in Equation 6 below.

Here, mod represents a 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.

는 PUSCH와 PUCCH에 대해 동일하며 다음의 수학식 7과 같이 주어진다.Group hopping pattern

Is the same for PUSCH and PUCCH and is given by Equation 7 below.

는 슈도-랜덤(pseudo-random) 시퀀스에 해당하며, 슈도-랜덤 시퀀스 생성기는 각 무선 프레임의 시작에서

로 초기화 될 수 있다.From here

Corresponds to a pseudo-random sequence, and the pseudo-random sequence generator is used at the beginning of each radio frame.

Can be initialized to

의 정의는 PUCCH와 PUSCH간에 서로 상이하다.Sequence shift pattern

Are different from each other between PUCCH and PUSCH.

는

로 주어지고, PUSCH에 대해서, 시퀀스 시프트 패턴 는

로 주어진다.

는 상위 계층에 의해 구성된다.For PUCCH, sequence shift pattern

Is

For PUSCH, a sequence shift pattern Is

Is given by

Is organized by higher layer.

Hereinafter, sequence hopping will be described.

인 기준 신호에 대해서만 적용된다.Sequence hopping has a length

Applies only for reference signals.

인 기준 신호에 대해서, 기본 시퀀스 그룹 내에서 기본 시퀀스 번호

가

로 주어진다.Length is

Base sequence number within the base sequence group,

end

Is given by

인 기준 신호에 대해서, 슬롯

에서 기본 시퀀스 그룹 내에서 기본 시퀀스 번호

는 다음의 수학식 8과 같이 주어진다.Length is

For a reference signal that is

Default sequence number within the default sequence group

Is given by Equation 8 below.

는 슈도-랜덤 시퀀스에 해당하고, 상위 계층에 의해 제공되는 시퀀스 호핑을 가능하게(enabled) 하는 파라미터는 시퀀스 호핑이 가능한지 여부를 결정한다. 슈도-랜덤 시퀀스 생성기는 무선 프레임의 시작에서

로 초기화 될 수 있다.From here,

Corresponds to a pseudo-random sequence, and a parameter that enables sequence hopping provided by a higher layer determines whether sequence hopping is enabled. Pseudo-Random Sequence Generator is used at the beginning of a radio frame

Can be initialized to

The reference signal for the PUSCH is determined as follows.

는

로 정의된다. m과 n은

을 만족하고,

을 만족한다.Reference Signal Sequence for PUSCH

Is

Is defined as m and n are

Satisfying,

To satisfy.

와 함께

로 주어진다.Cyclic shift in one slot

with

Is given by

는 방송되는 값이고,

는 상향링크 스케줄링 할당에 의해 주어지며,

는 셀 특정 순환 시프트 값이다.

는 슬롯 번호

에 따라 변하며,

와 같이 주어진다.

Is the value being broadcast,

Is given by the uplink scheduling assignment,

Is a cell specific cyclic shift value.

Is the slot number

Changes depending on

Is given by

는 슈도-랜덤 시퀀스이며,

는 셀-특정 값이다. 슈도-랜덤 시퀀스 생성기는 무선 프레임의 시작에서

로 초기화 될 수 있다.

Is a pseudo-random sequence,

Is a cell-specific value. Pseudo-Random Sequence Generator is used at the beginning of a radio frame

Can be initialized to

를 나타내는 표이다.Table 3 lists the cyclic shift fields in Downlink Control Information (DCI) format 0.

Table showing

The physical mapping method for the uplink RS in the PUSCH is as follows.

와 곱해지고,

로 시작하는 시퀀스 내에서 대응하는 PUSCH를 위해 사용되는 물리 자원 블록(Physical Resource Block: PRB)의 동일한 세트로 맵핑될 것이다. 표준 순환 전치에 대해서는

으로, 확장 순환 전치에 대해서는

으로 서브프레임 내에서 자원 요소 에 맵핑하는 것은 먼저

의 차수가 증가하고 그리고 나서 슬롯 번호의 순이 될 것이다.A sequence is an amplitude scaling factor

Multiplied by

It will be mapped to the same set of Physical Resource Blocks (PRBs) used for the corresponding PUSCH in the sequence beginning with. For the standard circular transpose

For extended circular transposition

Resource elements within subframes Mapping to

The order of increases and then the slot number.

이상이면, 순환 확장과 함께 ZC 시퀀스가 사용되고, 길이가

미만이면, 컴퓨터 생성 시퀀스가 사용된다. 순환 시프트는, 셀-특정 순환 시프트, 단말-특정 순환 시프트 및 호핑 패턴 등에 따라 결정된다.In short, the length

Above, the ZC sequence is used with circular expansion,

If less, a computer generated sequence is used. The cyclic shift is determined according to cell-specific cyclic shift, terminal-specific cyclic shift, hopping pattern, and the like.

FIG. 12A illustrates a structure of a demodulation reference signal (DMRS) for a PUSCH in the case of a normal CP, and FIG. 12B illustrates a structure of a DMRS for a PUSCH in the case of an extended CP. Drawing. In FIG. 12A, the DMRS is transmitted through the fourth and eleventh SC-FDMA symbols, and in FIG. 12B, the DMRS is transmitted through the third and ninth SC-FDMA symbols.

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

(1) Format 1: On-Off Keying (OOK) Modulation, Used for Scheduling Request (SR)

(2) Format 1a and Format 1b: used for ACK / NACK (Acknowledgment / Negative Acknowledgment) transmission

1) Format 1a: BPSK ACK / NACK for one codeword

2) Format 1b: QPSK ACK / NACK [for 2 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 correspond to a standard cyclic prefix.

13 shows PUCCH formats 1a and 1b in the case of standard cyclic prefix. 14 shows PUCCH formats 1a and 1b in case of extended cyclic prefix. In PUCCH formats 1a and 1b, control information having the same content is repeated in a slot unit in a subframe. In each terminal, the ACK / NACK signal includes a cyclic shift (CS) (frequency domain code) and an orthogonal cover code (orthogonal cover code) of a computer-generated constant amplitude zero auto correlation (CG-CAZAC) sequence. It is transmitted through different resources consisting of OC or OCC (Time Domain Spreading Code). OC includes, for example, Walsh / DFT orthogonal code. If the number of CSs is six and the number of OCs is three, a total of 18 terminals may be multiplexed in the same PRB (Physical Resource Block) based on a single antenna. Orthogonal sequences w0, w1, w2, w3 can 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, OC, and PRB (Physical Resource Block) may be given to the UE through RRC (Radio Resource Control). 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 may be applied to randomize inter-cell 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 / 1a / 1b and 2 / 2a / 2b may be multiplexed by CS + OC + PRB and CS + PRB, respectively.

Orthogonal sequences (OC) of length-4 and length-3 for PUCCH format 1 / 1a / 1b are shown in Tables 7 and 8 below.

Orthogonal sequence (OC) for RS in PUCCH format 1 / 1a / 1b is shown in Table 9 below.

인 경우에 해당한다.FIG. 17 illustrates ACK / NACK channelization for PUCCH formats 1a and 1b. 17 is

Corresponds to

FIG. 18 is a diagram illustrating channelization of a mixed structure of PUCCH formats 1 / 1a / 1b and formats 2 / 2a / 2b in the same PRB.

Cyclic Shift (CS) hopping and Orthogonal Cover (OC) remapping may be applied as follows.

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

(2) slot-level CS / OC remapping

1) for inter-cell interference randomization

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

Meanwhile, the resource n _r for the PUCCH format 1 / 1a / 1b includes the following combination.

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

(2) OC (orthogonal cover at slot level) (n _oc )

(3) Frequency RB (Resource Block) (n _rb )

When the indices representing CS, OC, and RB are n _cs , n _oc , and 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 ).

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

은 (20,A) RM 코드를 이용하여 채널 코딩된다. 표 10은 (20,A) 코드를 위한 기본 시퀀스를 나타낸 표이다.

와

는 MSB(Most Significant Bit)와 LSB(Least Significant Bit)를 나타낸다. 확장 CP의 경우, CQI와 ACK/NACK이 동시 전송되는 경우를 제외하면 최대 정보 비트는 11비트이다. RM 코드를 사용하여 20비트로 코딩한 후에 QPSK 변조가 적용될 수 있다. QPSK 변조 전, 코딩된 비트는 스크램블 될 수 있다.For example, channel coding for UL CQI in an LTE system is described as follows. Bit stream

Is channel coded using the (20, A) RM code. Table 10 shows a basic sequence for the (20, A) code.

Wow

Indicates a Most Significant Bit (MSB) and a Least Significant Bit (LSB). In the case of the extended CP, the maximum information bit is 11 bits except when the CQI and the ACK / NACK are simultaneously transmitted. After coding with 20 bits using the RM code, QPSK modulation can be applied. Prior to QPSK modulation, the coded bits may be scrambled.

는 수학식 9에 의해 생성될 수 있다.Channel coding bits

May be generated by Equation 9.

Where i = 0, 1, 2,... Satisfies B-1.

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

Table 12 shows the UCI fields for CQI and PMI feedback for broadband, which reports closed loop spatial multiplexing PDSCH transmissions.

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

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 interchangeably with carrier aggregation and bandwidth aggregation. In addition, carrier aggregation collectively refers to both contiguous and non-contiguous carrier merging.

20 is a diagram illustrating a concept of managing downlink component carriers in a base station, and 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 one MAC, and as shown in FIGS. 26 and 27, each carrier is controlled by one MAC and one by one for some carriers. One or more carriers can be controlled by one MAC.

The above system is a system comprising a plurality of carriers from 1 to N, and each carrier can 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, asymmetric carrier merging may be supported in which the number of carriers and / or the bandwidth of the carriers are merged in uplink and downlink.

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 applied. It is apparent that the corresponding PDSCH can be transmitted through another downlink component carrier. 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 the case where 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 UL CC. The illustrated asymmetric carrier merging may be set in terms of UCI transmission. That is, the DL CC-UL CC linkage for UCI and the DL CC-UL CC 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. 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 existing PUCCH formats 1a / 1b 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, but this situation may occur due to an increase in the number of antennas, the presence of a backhaul subframe in a TDD system, a relay system, and the like. 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. DL CC and UL CC may also be referred to as DL Cell and UL Cell, respectively. In addition, the anchor DL CC and the anchor UL CC may be referred to as DL Primary Cell (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, by the LTE pairing, a DL CC linked with a UL primary CC may be referred to as a DL primary CC. You can think of this as an implicit linkage. Explicit linkage means that the network configures the linkage in advance and can be grouped with 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, the 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 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.

Example: Multiple UCI Transmission Using Spreading Factor Reduction

Hereinafter, with reference to the drawings, a scheme for efficiently transmitting the increased uplink control information is proposed. Specifically, a new PUCCH format / signal processing procedure / resource allocation method for transmitting augmented uplink control information is proposed. For the sake of explanation, the PUCCH format proposed by the present invention is referred to as PUCCH format 3 in view of the definition of a new PUCCH format, an LTE-A PUCCH format, or PUCCH format 2 in existing LTE. The technical idea of the PUCCH format proposed by the present invention can be easily applied to any physical channel (eg, 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 a 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 only 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 an embodiment of the present invention may transmit information such as HARQ ACK / NACK, CQI, PMI, RI, etc., 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 the OC used for the PUCCH format of the existing LTE is reduced from 4 to 2. Basic signal processing is the same as described with reference to FIGS. 13 to 14.

29 to 30, information bits (e.g., ACK / NACK) are converted into modulation symbols through modulation (e.g., QPSK, 8PSK, 16QAM, 64QAM, etc.) (symbols 0, 1). After that, the modulation symbol is multiplied by the basic sequence r0, and then cyclically shifted, orthogonal code (OC) ([w0 w1]; [w2 w3]) of SF = 2 is applied, and IFFT transformed to map the SC-FDMA symbol. do. Where ro includes a base sequence of length 12. OC includes Walsh cover or DFT code defined in LTE. Depending on the implementation manner, [w0 w1] and [w2 w3] may be given independently of each other 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) during QPSK modulation.

라고 가정하면, 다중화 용량이 18(=6*3=(순환 쉬프트 개수)*(OC 개수))이 된다. 여기서, LTE PUCCH의 다중화 용량이 24(=6*4)가 아니라 18인 이유는 전체 다중화 용량은 RS의 OC 개수에 의해 제한되기 때문이다. 하지만, 상술한 바와 같이 OC의 SF를 SF=2로 감소시키면 다중화 용량이 12(=6*2)로 줄어든다. 이 경우는, PUCCH의 다중화 용량이 UCI 구간의 다중화 용량이 제한되게 된다.In contrast to the conventional LTE PUCCH structure, the above-described SF = 2 reduction method is reduced by SF in which the multiplexing capacity is reduced. For example, in LTE PUCCH

Is assumed to be 18 (= 6 * 3 = (cyclic shift number) * (OC number)). Here, the reason for 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 OCs of the RS. However, as described above, reducing the SF of the OC 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 show a case in which SF reduction is applied to a shortened PUCCH format. 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. The shortened PUCCH format may be understood to be punctured as the last SC-FDMA symbol of slot 1 in the normal PUCCH format as shown, or may be understood to be defined using one less SC-FDMA symbol in slot 1 have.

30-31, the last SC-FDMA symbol (symbol 6 or 5) is not used and w2 may be any element of OC, 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 cyclic shift. Since the total multiplexing capacity of the PUCCH is limited by the portion with 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 through 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 (w0, w1, w2) applied to the UCI interval may use an orthogonal code of length 3, for example, a DFT code. In the RS interval, a length 3 DFT code and a length 2 Walsh code may be applied to each of the standard CP and the extended CP cases. 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 of 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 keeping 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 to 36, in the case of the standard CP case, the SC-FDMA symbol 4 was originally an RS symbol in slot 1, and it may be replaced with a UCI symbol to maintain SF = 2. In the case of a standard CP, an orthogonal code of length 2 (eg, a 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, can be extended to 12.

Although not shown, another method will be described in which the shortened PUCCH format for SF reduction is not separately defined 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 perspective 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 RRC signaling) or a newly defined LTE-A signaling corresponding thereto.

When SRS transmission is not scheduled at a time point (eg, a subframe) where UCI transmission is scheduled, UCI may be transmitted using a PUCCH format as 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 suggested by the present invention. The memory 114 is connected to the processor 112 and stores various information related to the operation of the processor 112. The RF unit 116 is coupled to the processor 112 and transmits and / or receives wireless signals. The 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 by 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 coupled to the processor 122 and transmits and / or receives radio signals. 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 implemented in a form that is not combined with other components or features. It is also possible to combine some of the components and / or 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 certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as 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 to the same / similarly for signal transmission / reception between the UE and the relay or the BS and the relay. The specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. 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 can be performed by a network node other than the base station or 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 may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), and the like.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), 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 a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known 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 equivalent scope of the invention are included in the scope of the invention.

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 (10)

In a method for transmitting control information through a PUCCH (Physical Uplink Control Channel) 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 variable according to the number of SC-FDMA symbols for PUCCH transmission. 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,
When the number of SC-FDMA symbols for the 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, and 6 in the case of an extended CP, control information transmission method. The method of claim 2,
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,
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 method of claim 2,
When the number of SC-FDMA symbols for the PUCCH transmission is N, the plurality of modulation symbols are spread into a plurality of SC-FDMA symbols using a spreading factor (SF) = M, respectively,
If the number of SC-FDMA 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. The method of claim 4, wherein
M is 2, the control information transmission method. A terminal configured to transmit control information through a physical uplink control channel (PUCCH) in a wireless communication system,
RF (Radio Frequency) unit; And
Includes 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. Single Carrier Frequency Division Multiple Access) symbol, and transmit 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. The method of claim 6,
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,
When the number of SC-FDMA symbols for the 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, and the terminal, characterized in that 6 for an extended CP. 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. 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 into a plurality of SC-FDMA symbols using a spreading factor (SF) = M, respectively,
When the number of SC-FDMA symbols for PUCCH transmission is N-1, the one modulation symbol is characterized in that the spread to a plurality of SC-FDMA symbols using a code of SF = M + 1 ,. 10. The method of claim 9,
M is 2, the terminal.

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