KR101368494B1 - Method of transmitting control signal in wireless communication system - Google Patents

Method of transmitting control signal in wireless communication system Download PDF

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KR101368494B1
KR101368494B1 KR1020090016036A KR20090016036A KR101368494B1 KR 101368494 B1 KR101368494 B1 KR 101368494B1 KR 1020090016036 A KR1020090016036 A KR 1020090016036A KR 20090016036 A KR20090016036 A KR 20090016036A KR 101368494 B1 KR101368494 B1 KR 101368494B1
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pucch
index
sequence
resource
ack
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KR1020090016036A
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KR20090111271A (en
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김학성
김봉회
김기준
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엘지전자 주식회사
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Priority claimed from JP2011504936A external-priority patent/JP5089804B2/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/16Code allocation
    • H04J13/22Allocation of codes with a zero correlation zone
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/0007Code type
    • H04J13/0055ZCZ [zero correlation zone]
    • H04J13/0059CAZAC [constant-amplitude and zero auto-correlation]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/0074Code shifting or hopping
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1829Arrangements specific to the receiver end
    • H04L1/1861Physical mapping arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J13/00Code division multiplex systems
    • H04J13/10Code generation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources

Abstract

Provided are a control signal transmission method in a wireless communication system. The method includes obtaining a resource index, a cyclic shift interval and a cyclic shift number that is an integer multiple of the cyclic shift interval, determining a cyclic shift index based on the cyclic shift number and the cyclic shift interval, and the cyclic shift index Generating a cyclically shifted sequence by cyclically shifting a base sequence by the amount of cyclic shifts obtained therefrom, generating a modulated sequence based on the symbols for the cyclically shifted sequence and a control signal and converting the modulated sequence into After mapping to the resource block obtained from the resource index, transmitting the modulated sequence.

Description

Control signal transmission method in wireless communication system {METHOD OF TRANSMITTING CONTROL SIGNAL IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to wireless communication, and more particularly, to a control signal transmission method in a wireless communication system.

Background of the Invention [0002] Wireless communication systems are widely deployed to provide various types of communication services such as voice and data. The purpose of a wireless communication system is to allow multiple users to communicate reliably regardless of location and mobility. However, a wireless channel is a Doppler due to path loss, noise, fading due to multipath, intersymbol interference (ISI), or mobility of UE. There are non-ideal characteristics such as the Doppler effect. Therefore, various techniques have been developed to overcome the non-ideal characteristics of the wireless channel and to improve the reliability of the wireless communication.

Generally, a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available wireless resources. Examples of radio resources include time, frequency, code, and transmission power. Examples of multiple access systems include time division multiple access (TDMA) systems, code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency (SC-FDMA). division multiple access) system. In a TDMA system, time, a frequency in an FDMA system, a code in a CDMA system, and a subcarrier and time in an OFDMA system are radio resources.

SC-FDMA has almost the same complexity as OFDMA, but has a lower peak-to-average power ratio (PAPR) due to the single carrier property. Since the low PAPR is advantageous to the UE in terms of transmission power efficiency, the SC-FDMA is a 3GPP (3rd Generation Partnership Project) TS 36.211 V8.2.0 (2008-03) "Technical Specification Group Radio Access Network, UTRA), Physical channels and modulation (Release 8) "in 3GPP LTE (Long Term Evolution).

Meanwhile, various uplink control signals are transmitted through an uplink control channel. The uplink control signal includes ACK (Acknowledgment) / NACK (Not-Acknowledgment) signals used for performing hybrid automatic repeat request (HARQ), channel quality indicator (CQI) indicating downlink channel status, radio resources And a scheduling request (SR) requesting allocation.

A plurality of terminals in the cell may simultaneously transmit an uplink control signal to the base station. The base station should be able to distinguish the uplink control signal for each terminal transmitted at the same time. If the uplink control signal for each terminal is transmitted using a different frequency, the base station can distinguish it. However, a plurality of terminals in a cell may transmit an uplink control signal using the same time-frequency resource to the base station. In order to distinguish the uplink control signal for each terminal transmitted using the same time-frequency resource, orthogonal sequences may be used for uplink control signal transmission for each terminal. Alternatively, sequences having low correlation may be used. By the way, the number of orthogonal sequences or the number of sequences having low correlation with each other is limited. That is, not only the frequency but also the number of orthogonal sequences or sequences having low correlation with each other are important resources for wireless communication. If limited resources are not properly allocated to each terminal, system performance may be degraded.

Accordingly, there is a need to provide an uplink control signal transmission method that can efficiently use limited resources.

An object of the present invention is to provide a control signal transmission method in a wireless communication system.

In one aspect, a method of transmitting a control signal in a wireless communication system is provided. The method includes obtaining a resource index, a cyclic shift interval and a cyclic shift number that is an integer multiple of the cyclic shift interval, determining a cyclic shift index based on the cyclic shift number and the cyclic shift interval, and the cyclic shift index Generating a cyclically shifted sequence by cyclically shifting a base sequence by the amount of cyclic shifts obtained therefrom, generating a modulated sequence based on the symbols for the cyclically shifted sequence and a control signal and converting the modulated sequence into After mapping to the resource block obtained from the resource index, transmitting the modulated sequence.

In another aspect, a signal generator for generating and transmitting a wireless signal and the signal generator are connected to obtain a cyclic shift number that is an integer multiple of a resource index, a cyclic shift interval and the cyclic shift interval, and the cyclic shift number and the cyclic shift Determine a cyclic shift index based on the interval, generate a cyclically shifted sequence by cyclically shifting the base sequence by the amount of cyclic shift obtained from the cyclic shift index, and based on symbols for the cyclically shifted sequence and control signal The present invention provides an apparatus for wireless communication that generates a modulated sequence, maps the modulated sequence to a resource block obtained from the resource index, and then transmits the modulated sequence.

In another aspect, a method of transmitting a control signal on an uplink control channel in a wireless communication system is provided. The method includes establishing an uplink control channel and transmitting a control signal on the uplink control channel, wherein the uplink control channel is set through a cyclically shifted sequence and an orthogonal sequence and the cyclic shift The generated sequence and the orthogonal sequence are generated using a cyclic shift interval and a cyclic shift number which is an integer multiple of the cyclic shift interval, respectively.

An efficient control signal transmission method is provided. Thus, overall system performance can be improved.

The following description is to be understood as illustrative and not restrictive, with reference to the accompanying drawings, in which: FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention; And the like. CDMA may be implemented in 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 wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink.

For clarity, the following description focuses on 3GPP LTE, but the technical spirit of the present invention is not limited thereto.

1 shows a wireless communication system.

Referring to FIG. 1, a wireless communication system 10 includes at least one base station 11 (BS). Each base station 11 provides a communication service to a specific geographical area (generally called a cell) 15a, 15b, 15c. The cell may again be divided into multiple regions (referred to as sectors). A user equipment (UE) 12 may be fixed or mobile and may be a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA) A wireless modem, a handheld device, and the like. The base station 11 generally refers to a fixed station that communicates with the terminal 12 and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point have.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station.

The wireless communication system may support uplink and / or downlink HARQ (Hybrid Automatic Repeat Request). In addition, a channel quality indicator (CQI) can be used for link adaptation.

2 shows an HARQ ACK / NACK signal and a CQI transmission.

Referring to FIG. 2, a UE receiving downlink data from a BS transmits an HARQ ACK (Acknowledgment) / NACK (Not-Acknowledgment) signal after a predetermined time elapses. The downlink data may be transmitted on a Physical Downlink Shared Channel (PDSCH) indicated by a Physical Downlink Control Channel (PDCCH). The HARQ ACK / NACK signal becomes an ACK signal if the downlink data is successfully decoded, and becomes a NACK signal if decoding of the downlink data fails. When the NACK signal is received, the base station can receive the ACK signal or retransmit the downlink data up to the maximum number of retransmissions.

The transmission time and resource allocation of the HARQ ACK / NACK signal for the downlink data may be informed dynamically through signaling by the base station or may be predetermined according to the transmission time or resource allocation of the downlink data. For example, in a frequency division duplex (FDD) system, when a PDSCH is received through subframe n, the HARQ ACK / NACK signal for the PDSCH is transmitted through a physical uplink control channel (PUCCH) in subframe n + 4. Can be sent.

The UE can measure the downlink channel state and report the CQI to the BS periodically and / or aperiodically. The base station can use the CQI for downlink scheduling. The BS can inform the MS about the transmission time point of the CQI or the resource allocation.

3 shows an uplink transmission.

Referring to FIG. 3, for uplink transmission, the MS sends a Scheduling Request (SR) to the BS. SR is a kind of advance information exchange for data exchange in which the UE requests the uplink radio resource allocation to the base station. In order to transmit uplink data to the BS, the MS first requests a radio resource allocation through the SR.

The base station sends the uplink grant to the terminal in response to the SR. The uplink grant may be transmitted on the PDCCH. The uplink grant includes allocation of uplink radio resources. The UE transmits uplink data through the allocated uplink radio resource. The base station can inform the terminal about the transmission time of the SR and information on resource allocation.

As shown in FIGS. 2 and 3, the UE can transmit an uplink control signal such as HARQ ACK / NACK signal, CQI, and SR at a given transmission time. The type and size of the control signal may vary depending on the system, and the technical spirit of the present invention is not limited thereto.

4 shows a structure of a radio frame in 3GPP LTE.

Referring to FIG. 4, a radio frame is composed of 10 subframes, and one subframe is composed of two slots. The slots in the radio frame are slot numbered from 0 to 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI is a scheduling unit for data transmission. For example, the length of one radio frame is 10 ms, the length of one subframe is 1 ms, and the length of one slot may be 0.5 ms.

The structure of the radio frame is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the like can be variously changed.

5 is an exemplary diagram illustrating a resource grid for one uplink slot in 3GPP LTE.

Referring to FIG. 5, an uplink slot includes a plurality of SC-FDMA symbols in a time domain and an N UL resource block (RB) in a frequency domain. An SC-FDMA symbol is used to represent one symbol period and may be referred to as an OFDMA symbol or a symbol period depending on the system. The RB includes a plurality of subcarriers in the frequency domain in resource allocation units. The number N UL of resource blocks included in an uplink slot depends on an uplink transmission bandwidth set in a cell. In 3GPP LTE, N UL may be any of 60 to 110.

Each element on the resource grid is called a resource element. Resource elements on the resource grid may be identified by an index pair (k, l) in the slot. Where k (k = 0, ..., N UL × 12-1) is the subcarrier index in the frequency domain, and l (l = 0, ..., 6) is the SC-FDMA symbol index in the time domain.

Herein, one resource block includes 7 × 12 resource elements including 7 SC-FDMA symbols in the time domain and 12 subcarriers in the frequency domain. However, since the number of subcarriers in the resource block and the number of SC- Is not limited thereto. The number of SC-FDMA symbols or the number of sub-carriers included in the resource block may be variously changed. The number of SC-FDMA symbols may be changed according to the length of a cyclic prefix (CP). For example, the number of SC-FDMA symbols is 7 for a normal CP and 6 for an extended CP.

In 3GPP LTE of FIG. 5, a resource grid for one uplink slot can be applied to a resource grid for downlink slots. However, the downlink slot includes a plurality of OFDM symbols in the time domain.

6 shows an example of a structure of a downlink subframe in 3GPP LTE.

Referring to FIG. 6, the downlink subframe includes two consecutive slots. Up to three OFDM symbols of the first slot in the downlink subframe are the control region to which the PDCCH is allocated, and the remaining OFDM symbols are the data region to which the PDSCH is allocated. In addition to the PDCCH, the control region may be allocated a control channel such as a physical control format indicator channel (PCFICH) and a physical hybrid ARQ indicator channel (PHICH). The PDCCH may carry a downlink grant informing of resource allocation of downlink transmission on the PDSCH. The UE may read data information transmitted through the PDSCH by decoding a control signal transmitted through the PDCCH. Here, it is only an example that the control region includes 3 OFDM symbols. The number of OFDM symbols included in the control region in the subframe can be known through the PCFICH. The PHICH carries an HARQ ACK / NACK signal in response to the uplink transmission.

The control region consists of a set of a plurality of control channel elements (CCE). The PDCCH is transmitted on an aggregation of one or several consecutive CCEs. The CCE corresponds to a plurality of resource element groups. Resource element groups are used to define control channel mappings to resource elements. If the total number of CCEs in the downlink subframe is N CCE , the CCE is indexed from 0 to N CCE, k −1.

7 shows an example of a structure of an uplink subframe in 3GPP LTE.

Referring to FIG. 7, an uplink subframe may be divided into a control region to which a physical uplink control channel (PUCCH) carrying an uplink control signal is allocated and a data region to which a physical uplink shared channel (PUSCH) carrying user data is allocated. . In order to maintain a single carrier characteristic in SC-FDMA, a single resource block is allocated to a single UE as a resource in a frequency domain. One UE cannot transmit a PUCCH and a PUSCH at the same time.

A PUCCH for one UE is allocated as a resource block pair (RB pair) in a subframe. The resource blocks belonging to the resource block pair occupy different subcarriers in the first slot and the second slot. It is assumed that the resource block pair allocated to the PUCCH is frequency hopped at a slot boundary. and m is a position index indicating the frequency domain position of the resource block allocated to the PUCCH in the subframe.

The PUSCH is mapped to an uplink shared channel (UL-SCH) which is a transport channel. The uplink control signal transmitted on the PUCCH includes an HARQ ACK / NACK signal, a CQI indicating a downlink channel state, and an SR, which is an uplink radio resource allocation request.

PUCCH may support multiple formats. That is, an uplink control signal having a different number of bits per subframe may be transmitted according to a modulation scheme. The following table shows examples of the modulation scheme according to the PUCCH format and the number of bits per subframe.

Figure 112009011817191-pat00001

PUCCH format 1 is used for transmission of SR, PUCCH format 1a or format 1b is used for transmission of HARQ ACK / NACK signal, PUCCH format 2 is used for transmission of CQI, PUCCH format 2a / 2b is used for transmission of CQI and HARQ ACK / Lt; / RTI >

The PUCCH format 1a or the format 1b is used when the HARQ ACK / NACK signal is transmitted alone in a certain subframe, and the PUCCH format 1 is used when the SR is transmitted alone. The UE can transmit the HARQ ACK / NACK signal and the SR in the same subframe. In order to transmit a positive SR, the UE transmits an HARQ ACK / NACK signal through the PUCCH resource allocated for the SR. For negative SR transmission, the UE transmits a PUCCH resource allocated for the allocated ACK / Lt; RTI ID = 0.0 > ACK / NACK < / RTI >

The control signal transmitted on the PUCCH uses a cyclically shifted sequence. The cyclically shifted sequence may be generated by cyclically shifting a base sequence by a specific cyclic shift amount. The specific CS amount is indicated by the cyclic shift index (CS index). Various kinds of sequences can be used as the base sequence. For example, a well-known sequence such as a pseudo-random (PN) sequence or a Zadoff-Chu (ZC) sequence may be used as the base sequence. Alternatively, a computer generated constant amplitude zero auto-correlation (CAZAC) may be used. The following equation is an example of a basic sequence.

Figure 112009011817191-pat00002

Where i ∈ {0,1, ..., 29} is the root index, n is the element index, and 0≤n≤N-1, and N is the length of the base sequence. i may be defined by a cell ID, a slot number in a radio frame, or the like. Assuming that one resource block includes 12 subcarriers, N may be 12. Different base indexes are defined according to different primitive indexes. When N = 12, b (n) can be defined as shown in the following table.

Figure 112009011817191-pat00003

The cyclic-shifted sequence r (n, Ics) can be generated by cyclically shifting the base sequence r (n) according to the following equation.

Figure 112009011817191-pat00004

Here, Ics is a cyclic shift index indicating the amount of CS (0≤Ics≤N-1, and Ics is an integer).

In the following, the available CS of the base sequence is the CS that derives from the base sequence according to the CS unit. For example, if the length of the base sequence is 12 and the CS unit is 1, then the total number of available CSs in the base sequence is 12. Alternatively, if the length of the base sequence is 12 and the CS unit is 2, the total number of available CSs in the base sequence is six. The CS unit can be determined in consideration of a delay spread.

8 illustrates an example of PUCCH format 1 / 1a / 1b transmission in the case of a normal CP. This shows resource block pairs allocated to the first slot and the second slot in one subframe.

Referring to FIG. 8, each of the first slot and the second slot includes 7 SC-FDMA symbols. Of the 7 SC-FDMA symbols of each slot, 3 SC-FDMA symbols carry a reference signal (RS), and the remaining 4 SC-FDMA symbols carry control signals. RS is carried on three contiguous SC-FDMA symbols in the middle of each slot. At this time, the number and position of the symbols used for the RS may be changed, and the number and position of the symbols used for the control signal may be changed accordingly.

Each of the PUCCH formats 1, 1a and 1b uses one complex-valued symbol d (0). The base station can know the SR only by the presence or absence of the PUCCH transmission from the terminal. Therefore, a specific value, for example, d (0) = 1, can be used as the complex symbol d (0) for PUCCH format 1. The complex symbol d (0) for the PUCCH format 1a is generated by BPSK (Binary Phase Shift Keying) modulation of 1 bit of HARQ ACK / NACK information. The complex symbol d (0) for PUCCH format 1b is generated by quadrature phase shift keying (QPSK) modulation of 2 bits of HARQ ACK / NACK information.

(N) based on the complex symbol d (0) for the PUCCH format 1 / 1a / 1b and the cyclically shifted sequence r (n, Ics). A modulated sequence y (n) may be generated by multiplying a cyclically shifted sequence r (n, Ics) by a complex symbol d (0) as shown in the following equation.

Figure 112009011817191-pat00005

The cyclic shift index Ics of the cyclically shifted sequence r (n, Ics) may vary according to the slot number n s in the radio frame and the SC-FDMA symbol index (l) in the slot. Therefore, the cyclic shift index Ics can be expressed by Ics (n s , l). Here, Ics (0, 0) = 0, Ics (0, 1) = 1, Ics (0, 5) = 2, Ics (1, 6) = 3, Ics (1, 0) = 4, Ics .

To increase the terminal capacity, the modulated sequence y (n) may be spread using an orthogonal sequence. Here, it is shown that spreading the modulated sequence y (n) through an orthogonal sequence w (k) with a spreading factor K = 4 for a 4 SC-FDMA symbol carried by a control signal in one slot.

An orthogonal sequence w Ios (k) (Ios is an orthogonal sequence index, 0 ≦ k ≦ K−1) having a spreading coefficient K = 4 may use a sequence shown in the following table.

Figure 112009011817191-pat00006

Alternatively, the sequence shown in the following table can be used as the orthogonal sequence w Ios (k) (I os is an orthogonal sequence index, 0? K? K-1) having a spreading factor K = 3.

Figure 112009011817191-pat00007

Orthogonal sequence index Ios may differ according to the slot number within a radio frame (n s). Therefore, the orthogonal sequence index Ios can be expressed by (n s) Ios.

Also, the modulated sequence y (n) may be scrambled in addition to spreading using an orthogonal sequence. For example, the modulated sequence y (n) may be multiplied by 1 or j depending on certain parameters.

RS may be generated based on a cyclically shifted sequence and an orthogonal sequence generated from the same base sequence as the control signal. The cyclic-shifted sequence can be spread as an RS through an orthogonal sequence w (k) with a spreading factor K = 3. Therefore, in addition to the cyclic shift index and the orthogonal sequence index for the control signal, the terminal also needs a cyclic shift index and an orthogonal sequence index for the RS to transmit the control signal.

9 shows an example of PUCCH format 1 / 1a / 1b transmission in case of an extended CP.

9, each of the first slot and the second slot includes 6 SC-FDMA symbols. Among the 6 SC-FDMA symbols of each slot, RS is placed in the 2 SC-FDMA symbols, and control signals are placed in the remaining 4 SC-FDMA symbols. Except for this, the example of the normal CP of FIG. 8 is applied as it is. However, the RS can spread the cyclic-shifted sequence through the orthogonal sequence w (k) with the spreading factor K = 2 and use it as an RS.

The orthogonal sequence w Ios (k) (Ios is an orthogonal sequence index, 0? K? K-1) with a spreading factor K = 2 can be used as the following table.

Figure 112009011817191-pat00008

As described above, for the normal CP and the extended CP, the following information is required for PUCCH format 1/1 / a / 1b transmission. A cyclic shift index Ics for the control signal and a cyclic shift index I'cs and orthogonal sequence index I'os for the orthogonal sequence index Ios, RS are required.

10 shows an example of PUCCH format 2 / 2a / 2b transmission.

Referring to FIG. 10, RS is carried on 2 SC-FDMA symbols among 7 SC-FDMA symbols included in each slot, and CQI is carried on the remaining 5 SC-FDMA symbols. In this case, the number and position of symbols used for the RS may vary, and the number and position of symbols used for the CQI may change accordingly.

Each of the PUCCH formats 2, 2a, and 2b may use 20 bits of CQI information per subframe. 20-bit CQI information is mapped to 10 modulation complex symbols d (0) to d (9) through QPSK modulation. In PUCCH format 2a, 1-bit HARQ ACK / NACK information is mapped to one modulation complex symbol d (10) through BPSK modulation. In PUCCH format 2b, two bits of HARQ ACK / NACK information are mapped to one modulation complex symbol d (10) through QPSK modulation.

A modulated sequence is generated based on the modulation complex symbols d (0) to d (9) and the cyclically shifted sequence r (n, Ics) generated from the base sequence. The cyclic shift index Ics of the cyclically shifted sequence r (n, Ics) may vary depending on the slot number n s in the radio frame and the SC-FDMA symbol index l in the slot. Therefore, the cyclic shift index Ics can be expressed by Ics (n s , l). Here, the slot number of the first slot is 0, the slot number of the second slot is 1, Ics (0,0) = 0, Ics (0,2) = 1, Ics (0,3) = 2, Ics (0,4) = 3, Ics (0,6) = 4, Ics (1,0) = 5, Ics (1,2) = 6, Ics (1,3) = 7, Ics (1,4 ) = 8 and Ics (1,6) = 9, but this is only an example. The RS may use a cyclically shifted sequence generated from the same basic sequence as the control signal. In PUCCH formats 2a and 2b, respectively, one modulation complex symbol d (10) is used for RS generation.

PUCCH format 2 / 2a / 2b does not use orthogonal sequences unlike PUCCH format 1 / 1a / 1b.

11 is a flowchart illustrating an example of a method for transmitting an uplink control signal.

Referring to FIG. 11, the base station transmits a parameter relating to a PUCCH resource to the terminal (S110). The terminal determines a PUCCH resource using a parameter related to the PUCCH resource (S120). The terminal transmits a control signal using the PUCCH resource (S130).

The PUCCH resource is a resource used for transmitting the control signal through the PUCCH. A plurality of terminals in a cell can simultaneously transmit control signals to a base station. At this time, if each terminal uses different PUCCH resources, the base station can distinguish control signals for each terminal. PUCCH resources are identified by PUCCH resource index. The cyclic shift index and frequency are determined from the PUCCH resource index. The orthogonal sequence index may also be determined from the PUCCH resource index. Hereinafter, n (1) PUCCH is a PUCCH resource index for a PUCCH format 1 / 1a / 1b as a first PUCCH resource index, and n (2) PUCCH is a PUCCH resource index for a PUCCH format 2 / 2a / 2b as a second PUCCH resource index. Resource index.

Parameters for the PUCCH resource may be set by a higher layer of the physical layer. For example, the upper layer may be RRC (Radio Resource Control) which plays a role of controlling radio resources between the terminal and the network.

Parameters related to PUCCH resources include the number of resource blocks N (2) RB , the number of CSs N (1) CS , the cyclic shift interval (CS interval) Δ shift, and N (1) PUCCH . The parameters are common parameters common to all terminals in the cell. The physical resource used for the PUCCH is dependent on the number of resource blocks N (2) RB and the number of cyclic shifts N (1) CS .

Number of Resource Blocks N (2) RB is the number of resource blocks that can be used only for transmission for PUCCH format 2 / 2a / 2b in each slot.

Cyclic Shift Number N (1) CS is the number of cyclic shifts used for PUCCH format 1 / 1a / 1b in a mixed RB. The mixed resource block is a resource block used for mixing PUCCH formats 1 / 1a / 1b and 2 / 2a / 2b. Within each slot, less than one resource block is supported as a mixed resource block. The uplink control information of each of a plurality of terminals in a cell may be multiplexed with a resource block received by the base station. In the mixed resource block, different types of control information can be multiplexed. For example, in a mixed resource block, HARQ ACK / NACK signals transmitted by one terminal and CQIs transmitted by another terminal may be multiplexed. In addition, in a mixed resource block, an SR transmitted by one UE and a CQI transmitted by another UE may be multiplexed. For example, the cyclic shift number N (1) CS may be set to a value of 0 to 8. If the cyclic shift number N (1) CS is 0, there is no mixed resource block.

The cyclic shift interval Δ shift is the minimum interval between two adjacent cyclic shifts reserved for PUCCH. The cyclic shift index interval may mean a difference of the cyclic shift index between the first PUCCH resource indexes. The first PUCCH resource indexes may be consecutive or adjacent indexes. Alternatively, the first PUCCH resource indexes may be indexes using the same orthogonal sequence index. The cyclic shift interval may be determined according to the channel situation.

N (1) PUCCH is the number of first PUCCH resource indexes allocated for SR and semi-persistent scheduling (SPS) ACK / NACK signals. The SPS ACK / NACK signal is an ACK / NACK signal for downlink data transmitted through semi-static scheduling. When the downlink data is transmitted through the PDSCH, there is no PDCCH corresponding to the PDSCH.

PUCCH resource indexes are assigned via a combination of parameters for PUCCH resource. The PUCCH resource index allocation rule may be variously implemented. The terminal may receive the PUCCH resource index from the base station or may obtain it through a previously agreed protocol.

The first PUCCH resource index for the SR and the SPS ACK / NACK signal informs the terminal by the base station. Second PUCCH resource index n (2) PUCCH , the base station also informs the UE. The second PUCCH resource index n (2) PUCCH may satisfy the following equation.

Figure 112009011817191-pat00009

Here, N is the number of subcarriers included in the resource block. The reason why N (1) CS and 2 are subtracted from N is because two unassigned cyclic shift indexes are placed in the mixed resource block to prevent interference with the cyclic shift index used by the first PUCCH resource index.

The first PUCCH resource index for the dynamic ACK / NACK signal may be obtained through a predetermined protocol. The dynamic ACK / NACK signal is an ACK / NACK signal for downlink data transmitted through dynamic scheduling. In dynamic scheduling, whenever a base station transmits downlink data through a PDSCH, a downlink grant is transmitted to the user equipment through a PDCCH each time. The first PUCCH resource index may be obtained from a radio resource through which a control channel for receiving downlink data is transmitted. The following equation is an example of determining the first PUCCH resource index n (1) PUCCH .

Figure 112009011817191-pat00010

Here, n CCE is the first CCE index used for PDCCH transmission for the PDSCH.

The first PUCCH resource indexes are allocated through a combination of cyclic shift number N (1) CS and cyclic shift interval Δ shift . The cyclic shift index and the orthogonal sequence index for the control signal are determined based on the cyclic shift number N (1) CS and the cyclic shift interval Δ shift . First PUCCH resource index n (1) PUCCH may also be used to determine a cyclic shift index and an orthogonal sequence index. Orthogonal sequence index may be used to determine the cyclic shift index.

The cyclic shift index Ics (n s ) and the orthogonal sequence index Ios (n s ) for the control signal can be obtained as in the following equation.

Figure 112009011817191-pat00011

Figure 112009011817191-pat00012

Here, c (n) is a PN sequence and N symb is the number of SC-FDMA symbols included in the slot. c (n) may be defined by a Gold sequence of length-31. The following equation shows an example of the sequence c (n).

Figure 112009011817191-pat00013

Wherein N C = 1600, x 1 (i) is the first m-sequence and x 2 (i) is the second m-sequence. For example, the first m-sequence or the second m-sequence may be initialized according to the cell ID every radio frame. The initialization of the second m-sequence can be expressed as the following equation.

Figure 112009011817191-pat00014

Here, N cell_ID is a cell ID.

The cyclic shift index I'cs (n s ) and the orthogonal sequence index I'os (n s ) for RS can be obtained by the following equation.

Figure 112009011817191-pat00015

12 shows an example of an RB to which a PUCCH is allocated.

Referring to FIG. 12, the number N (2) RBs of resource blocks is two. Thus, two resource blocks (eg, m = 0, 1) are used only for transmission for PUCCH format 2 / 2a / 2b. Resource blocks with m = 2 are mixed resource blocks. The resource block with m = 3 is used only for transmission for PUCCH format 1 / 1a / 1b.

Resource blocks (or subcarriers) allocated to the PUCCH may be obtained from the PUCCH resource index. The position index m representing the frequency domain position of the resource block allocated to the PUCCH in the subframe may be obtained as in the following equation.

Figure 112009011817191-pat00016

Hereinafter, an example of a combination of problematic parameters in the first PUCCH resource index n (1) PUCCH allocation through a combination of parameters for PUCCH resources will be described.

(1) Example of the first combination

An example of the first combination is a case where the cyclic shift interval Δ shift = 3 in a resource block supporting only the extended CP and PUCCH formats 1 / 1a / 1b.

The following table shows a first PUCCH resource index n (1) PUCCH allocation according to an example of the first combination.

Figure 112009011817191-pat00017

Here, M + 0 to M + 7 are eight first PUCCH resource indexes n (1) PUCCHs allocated in the resource block. For example, if the first PUCCH resource index is M + 7, the cyclic shift index Ics for the control signal and the RS is 0 (if d offset = 0), and the orthogonal sequence index Ios, I 'for the control signal and the RS os is 2. M is the number of first PUCCH resource indexes n (1) PUCCHs allocated in the resource block preceding the resource block. The preceding resource block may be a resource block having a location index smaller than that of the resource block in the same slot. For example, the foregoing resource block may be a mixed resource block. If the cyclic shift number N (1) CS is 0, there may be no mixed resource block, and thus M = 0. If M = 0, a first PUCCH resource index n (1) PUCCH is allocated for the first time in the resource block.

The first PUCCH resource index M + 7 has a problem that the index order is not correct. You can change the index order to ensure consistency. However, correcting it correctly is not easy. This is because this case is a problem of the first PUCCH resource index allocation in the resource block subsequent to the mixed resource block. You can use it as it has no significant impact on performance.

(2) Example of the second combination

An example of the second combination is a case where the cyclic shift interval Δ shift = 3 and the number of cyclic shifts N (1) CS = 8 in a normal CP, mixed resource block.

The following table shows a first PUCCH resource index n (1) PUCCH allocation according to an example of the second combination.

Figure 112009011817191-pat00018

Here, 0 to 7 are eight first PUCCH resource indexes n (1) PUCCH allocated in the mixed resource block. N / A represents an unallocated cyclic shift index. The unassigned cyclic shift index means a cyclic shift index that is not assigned to any terminal in the cell. In the table, I CQI means a second PUCCH resource index n (2) PUCCH allocated for CQI transmission. In the mixed resource block, two second PUCCH resource indexes are allocated.

The first PUCCH resource index 5 does not match the index order. In addition, the first PUCCH resource indexes 0 and 5 use the same cyclic shift index. In addition, the first PUCCH resource indexes 6 and 7 also have problems in arrangement. Therefore, the first PUCCH resource indexes 3, 4, 5, 6, and 7 have problems in index allocation. If the pattern between the first PUCCH resource indexes is not uniform as in the second combination, the amount of interference may increase. This can lead to performance degradation of the wireless communication system.

The first PUCCH resource index n (1) PUCCH allocation according to the example of the second combination may be changed as shown in the following table to improve performance.

Figure 112009011817191-pat00019

(3) Example of the third combination

An example of the third combination is a case where the cyclic shift interval Δ shift = 3 and the number of cyclic shifts N (1) CS = 8 in the extended CP, mixed resource block.

The following table shows a first PUCCH resource index n (1) PUCCH allocation according to an example of the third combination.

Figure 112009011817191-pat00020

Here, 0 to 5 are six first PUCCH resource indexes n (1) PUCCH allocated in the mixed resource block. In the mixed resource block, two second PUCCH resource indexes n (2) PUCCHs are allocated.

The first PUCCH resource index 5 does not match the index order, and the first PUCCH resource indexes 0 and 5 use the same cyclic shift index. Therefore, the first PUCCH resource indexes 3, 4, and 5 have a problem in index allocation.

The first PUCCH resource index n (1) PUCCH allocation according to the third combination example may be changed as shown in the following table to improve performance.

Figure 112009011817191-pat00021

However, changing the first PUCCH resource index allocation in a combination of problematic parameters is an exceptional case of the above-described PUCCH resource index allocation rule. Implementing exceptional allocation rule changes not only increases the complexity of the wireless communication system, but also requires additional costs. In addition, the above-mentioned combination of problematic parameters is merely an example, and there may be more combinations of problematic parameters than this. Thus, changing the exceptional allocation rule is not a desirable solution.

There may be a method of changing the PUCCH resource index allocation rule itself and formulating it so that a combination of problematic parameters does not come out. However, even if the formulation of the new PUCCH resource index allocation rule succeeds and is feasible, there is little or no improvement in performance compared to the investment effort and cost. Therefore, there is a need for a method that can simply solve this problem.

By restricting the use of the problematic parameter combination or setting the usable parameter combination, a problem that may occur in the first PUCCH resource index allocation can be easily solved. For example, it is possible to limit the number of available cyclic shifts N (1) CS . Through this, the first PUCCH resource index may be allocated without problems in the normal CP and the extended CP. Hereinafter, a method of setting a combination of parameters that can be used for each case will be described.

First, a case in which a cyclic shift interval Δ shift = 3 in a normal CP and mixed resource block will be described. When the number of cyclic shifts N (1) CS is 2, 4, 5, 7, or 8, a problem occurs when allocating the first PUCCH resource index. Therefore, when the normal CP and the cyclic shift interval Δ shift = 3, 2, 4, 5, 7 and 8 are not used as the cyclic shift number N (1) CS . That is, 0, 1, 3 or 6 can be used as the cyclic shift number N (1) CS .

Second, a case in which a cyclic shift interval Δ shift = 3 in an extended CP and mixed resource block will be described. Like the normal CP, when the cyclic shift number N (1) CS is 2, 4, 5, 7, or 8, a problem occurs when allocating the first PUCCH resource index. Therefore, when the extended CP, the cyclic shift interval Δ shift = 3, 0, 1, 3 or 6 can be used as the cyclic shift number N (1) CS as in the case of the normal CP.

Therefore, regardless of the type of CP, when Δ shift = 3, 0, 1, 3, or 6 may be used as the cyclic shift number N (1) CS . If the cyclic shift number N (1) CS is 0, since there is no mixed resource block, 0 may be used as the cyclic shift number N (1) CS . When cyclic shift number N (1) CS is 1, since only one first PUCCH resource index exists, 1 may be used as cyclic shift number N (1) CS .

In this case, the usable parameter set may be variously configured. For a simple implementation, when the cyclic shift interval Δ shift = 3, the set of available cyclic shift numbers N (1) CS is {3}, {6}, {0, 3}, {0, 6} or {0 , 3, 6}.

The cyclic shift number N (1) CS may be determined as a multiple of the cyclic shift interval Δ shift . This can be implemented as the following equation.

Figure 112009011817191-pat00022

Where k is an integer. The set of possible k may be set to {1}, {2}, {0, 1}, {0, 2}, {1, 2} or {0, 1, 2}. Accordingly, the set of usable cyclic shift number N (1) CS may be variously set.

Cyclic shift number N (1) number of second PUCCH resource index n in the mixed resource block n (2) according to CS cyclic shift index used by the PUCCH and second PUCCH resource index n (2) number of PUCCHs allocated to the mixed resource block ( N CQI ) is determined. When Δ shift = 3 and the difference between cyclic shift indexes between adjacent second PUCCH resource indexes allocated in the mixed resource block is 1, the relationship between the number of cyclic shifts N (1) CS and N CQI is expressed as shown in the following table. Can be.

Figure 112009011817191-pat00023

A number of second PUCCH resource indexes n (2) PUCCHs allocated in a mixed resource block (N CQI ) may be set in association with a cyclic shift interval Δ shift and a cyclic shift number N (1) CS . That is, a difference between cyclic shift indexes between adjacent second PUCCH resource indexes allocated in the mixed resource block may be set equal to Δ shift . In this case, the relationship between the number of cyclic shifts N (1) CS and N CQI can be expressed as shown in the following table.

Figure 112009011817191-pat00024

However, the number of usable cyclic shifts N (1) CS is limited to 0, 1, 3, 6 according to the cyclic shift interval Δ shift = 3.

In this case, the usable parameter set of cyclic shift interval Δ shift , cyclic shift number N (1) CS and N CQI may be set as shown in the following table.

Figure 112009011817191-pat00025

Since the available parameter set as shown in the above table is simple, the implementation method can be simplified and the overhead of the system can be reduced.

13 is a flowchart illustrating a control signal transmission method according to an embodiment of the present invention.

Referring to FIG. 13, the base station transmits a cyclic shift number N (1) CS and a cyclic shift interval Δ shift to the terminal (S210). At this time, N (1) CS is 6 and Δ shift is 3. That is, N (1) CS is an integer multiple of Δ shift . The terminal sets the PUCCH (S220). At this time, the UE sets the PUCCH using the cyclic shift number N (1) CS and the cyclic shift interval Δ shift . The terminal transmits a control signal to the base station through the PUCCH (S230). The control signal may be an HARQ ACK / NACK signal or an SR.

14 is a flowchart illustrating a PUCCH setting method.

Referring to FIG. 14, the terminal acquires a resource index, the number of cyclic shifts, and a cyclic shift interval (S310). Here, the resource index may be a first PUCCH resource index n (1) PUCCH . The terminal determines the orthogonal sequence index and the cyclic shift index using the number of cyclic shifts and the cyclic shift interval (S320). The terminal generates a cyclically shifted sequence using the cyclic shift index (S330). The cyclically shifted sequence is generated by cyclically shifting the base sequence by the amount of CS indicated by the cyclic shift index. The terminal generates a modulated sequence based on the cyclically shifted sequence and the symbol for the control signal (S340). The modulated sequence can be generated by multiplying the symbol by a cyclically shifted sequence. The terminal generates a spread sequence using the orthogonal sequence index (S350). The spread sequence is generated by spreading the modulated sequence into an orthogonal sequence indicated by the orthogonal sequence index. The terminal maps the spread sequence to the resource block (S360). The resource block is a resource block indicated by a resource index. The terminal transmits a spread sequence mapped to the resource block. The RB may be a mixed RB or an RB used only for transmission for PUCCH format 1 / 1a / 1b.

15 is a block diagram illustrating an apparatus for wireless communication according to another embodiment of the present invention. This device may be part of a terminal.

Referring to FIG. 15, an apparatus 800 for wireless communication includes a processor 810, a memory 820, and a signal generator 840. The memory 820 stores the basic sequence. Processor 810 is coupled to memory 820 and establishes a control channel. The processor 810 processes the control signal as described above to set a PUCCH for control signal transmission. The signal generator 840 generates and transmits a radio signal for transmission through the antenna 890 from the control signal processed by the processor 810.

The signal generator 840 may generate a transmission signal of the SC-FDMA scheme. The signal generator 840 may include a DFT unit 842, a subcarrier mapper 844, and an IFFT unit 844, which perform a DFT (Discrete Fourier Transform) And an IFFT unit 846 for performing Inverse Fast Fourier Transform (IFFT). The DFT unit 842 performs a DFT on an input sequence to output a frequency domain symbol. The subcarrier mapper 844 maps the frequency domain symbols to each subcarrier, and the IFFT unit 846 performs IFFT on the input symbols to output a time domain signal. The time domain signal becomes a transmission signal and is transmitted via the antenna 890. [ The time domain signal generated by the signal generator 840 can be used to generate a time domain signal using a single carrier frequency division multiple access (SC-FDMA) scheme. At this time, SC-FDMA symbol or an OFDMA symbol.

As such, by limiting the number of usable cyclic shifts according to the cyclic shift interval, it is possible to prevent the PUCCH resource index from being inappropriately allocated. This method has the advantage of being very simple to implement. Through this, it is possible to reduce the interference that may occur between each terminal, and to prevent performance degradation of the system. Therefore, the performance of the entire system can be improved.

All of the functions described above may be performed by a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), etc. according to software or program code or the like coded to perform the function. The design, development and implementation of the above code will be apparent to those skilled in the art based on the description of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention. You will understand. Therefore, it is intended that the present invention covers all embodiments falling within the scope of the following claims, rather than being limited to the above-described embodiments.

1 shows a wireless communication system.

2 shows an HARQ ACK / NACK signal and a CQI transmission.

3 shows an uplink transmission.

4 shows a structure of a radio frame in 3GPP LTE.

5 is an exemplary view illustrating a resource grid for one uplink slot in 3GPP LTE.

6 shows an example of a structure of a downlink subframe in 3GPP LTE.

7 shows an example of a structure of an uplink subframe in 3GPP LTE.

8 illustrates an example of PUCCH format 1 / 1a / 1b transmission in the case of a normal CP.

9 shows an example of PUCCH format 1 / 1a / 1b transmission in case of an extended CP.

10 shows an example of PUCCH format 2 / 2a / 2b transmission.

11 is a flowchart illustrating an example of a method for transmitting an uplink control signal.

12 shows an example of an RB to which a PUCCH is allocated.

13 is a flowchart illustrating a control signal transmission method according to an embodiment of the present invention.

14 is a flowchart illustrating a PUCCH setting method.

15 is a block diagram illustrating an apparatus for wireless communication according to another embodiment of the present invention.

Claims (16)

  1. In a method of transmitting an ACK (acknowledgement) / NACK (not-acknowledgement) signal of a terminal in a wireless communication system,
    From the base station, N (1) CS receives information about N (2) RB and Δ PUCCH shift , where N (1) CS represents the number of CSI (cyclic shift index) in the mixed resource block, N (2) ) RB denotes the number of resource blocks available for transmission of CQI (channel quality indicator), Δ shift PUCCH denotes a cyclic shift (CS) interval (interval);
    Determine a first resource index n (1) PUCCH that identifies a resource used for transmission of the ACK / NACK signal;
    Determine a second resource index n (2) PUCCH that identifies a resource used for transmission of the CQI;
    Determine an orthogonal sequence index (OSI) and a CSI used for transmission of the ACK / NACK signal based on N (1) CS , Δ PUCCH shift and n (1) PUCCH ; And
    Transmitting the ACK / NACK signal to the base station using the determined OSI and CSI,
    N (1) CS is an integer multiple of Δ PUCCH shift ,
    The ACK / NACK signal and the CQI are transmitted in the mixed resource block by at least one terminal,
    n (2) PUCCH is
    Figure 112012064942822-pat00041
    N is determined to satisfy (the number of subcarriers included in one resource block) ACK / NACK signal transmission method.
  2. The method of claim 1, wherein transmitting the ACK / NACK signal
    Modulating the ACK / NACK signal into a sequence to generate a modulated sequence, wherein the sequence is a cyclically shifted sequence by the determined CSI,
    Spreading the modulated sequence into an orthogonal sequence obtained by the determined OSI to produce spread symbols, and
    Transmitting the spread symbols on a physical uplink control channel (PUCCH).
  3. The method of claim 1,
    The CS interval is a minimum interval between two adjacent CS corresponding to the ACK / NACK signal transmission method.
  4. The method of claim 1,
    The resource block includes a plurality of subcarriers and a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols.
  5. A terminal for transmitting an ACK (acknowledgement) / NACK (not-acknowledgement) signal in a wireless communication system,
    A signal generator for generating and transmitting a wireless signal; And
    And a processor coupled to the signal generator, wherein the processor
    From the base station, N (1) CS receives information about N (2) RB and Δ PUCCH shift , where N (1) CS represents the number of CSI (cyclic shift index) in the mixed resource block, N (2) ) RB denotes the number of resource blocks available for transmission of CQI (channel quality indicator), Δ shift PUCCH denotes a cyclic shift (CS) interval (interval);
    Determine a first resource index n (1) PUCCH that identifies a resource used for transmission of the ACK / NACK signal;
    Determine a second resource index n (2) PUCCH that identifies a resource used for transmission of the CQI;
    Determine an orthogonal sequence index (OSI) and a CSI used for transmission of the ACK / NACK signal based on N (1) CS , Δ PUCCH shift and n (1) PUCCH ; And
    Transmitting the ACK / NACK signal to the base station using the determined OSI and CSI,
    N (1) CS is an integer multiple of Δ PUCCH shift ,
    The ACK / NACK signal and the CQI are transmitted in the mixed resource block by at least one terminal,
    n (2) PUCCH is
    Figure 112012064942822-pat00042
    N is determined to satisfy (the number of subcarriers included in one resource block).
  6. 6. The processor of claim 5, wherein the processor is
    Modulating the ACK / NACK signal into a sequence to generate a modulated sequence, wherein the sequence is a cyclically shifted sequence by the determined CSI,
    Spreading the modulated sequence into an orthogonal sequence obtained by the determined OSI to produce spread symbols, and
    Transmitting the spread symbols on a physical uplink control channel (PUCCH),
    Terminal for transmitting the ACK / NACK signal.
  7. 6. The method of claim 5,
    The CS interval is a minimum interval between two adjacent CS corresponding to the ACK / NACK signal transmission.
  8. 6. The method of claim 5,
    The resource block includes a plurality of subcarriers and a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols.
  9. delete
  10. delete
  11. delete
  12. delete
  13. delete
  14. delete
  15. delete
  16. delete
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