WO2011162539A2 - Procédé de transmission d'informations de réponse - Google Patents

Procédé de transmission d'informations de réponse Download PDF

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Publication number
WO2011162539A2
WO2011162539A2 PCT/KR2011/004533 KR2011004533W WO2011162539A2 WO 2011162539 A2 WO2011162539 A2 WO 2011162539A2 KR 2011004533 W KR2011004533 W KR 2011004533W WO 2011162539 A2 WO2011162539 A2 WO 2011162539A2
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Prior art keywords
response information
resource
ack
downlink
nack
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PCT/KR2011/004533
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English (en)
Korean (ko)
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WO2011162539A3 (fr
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이현우
장지웅
정재훈
한승희
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엘지전자 주식회사
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Publication of WO2011162539A2 publication Critical patent/WO2011162539A2/fr
Publication of WO2011162539A3 publication Critical patent/WO2011162539A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to a wireless communication system. Specifically, the present invention proposes a channel selection scheme for transmission of ACK / NACK (and DTX) for effectively supporting a plurality of component carriers in a mobile communication system.
  • a 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)) communication system will be described.
  • E-UMTS Evolved Universal Mobile Telecommunications System
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • the E-UMTS may be referred to as a Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the technical specification of the E-UMTS refer to Release 7 of the "3rd Generation Partnership Project; Technical Specification Group Radio Access Network”.
  • the technical specification of the E-UMTS refer to Release 8 and Release 9 of the "3rd Generation Partnership Project; Technical Specification Group Radio Access Network”.
  • an E-UMTS is located at an end of a user equipment (UE) 120, a base station (eNode B; eNB) 110a and 110b, and a network (E-UTRAN) to be connected to an external network.
  • UE user equipment
  • eNode B base station
  • E-UTRAN network
  • A Access Gateway
  • the base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
  • the cell is set to one of the bandwidths of 1.4, 3, 5, 10, 15, 20Mhz, etc. to provide downlink or uplink transmission service to multiple terminals. Different cells may be configured to provide different bandwidths.
  • the base station controls data transmission and reception for a plurality of terminals.
  • For downlink (DL) data the base station transmits downlink scheduling information to inform the corresponding UE of time / frequency domain, encoding, data size, and HARQ (Hybrid Automatic Repeat and reQuest) related information.
  • the base station transmits uplink scheduling information to the terminal for uplink (UL) data and informs the user of the time / frequency domain, encoding, data size, HARQ-related information, etc. that the terminal can use.
  • DL downlink
  • HARQ Hybrid Automatic Repeat and reQuest
  • the core network may be composed of an AG and a network node for user registration of the terminal.
  • the AG manages the mobility of the UE in units of a tracking area (TA) composed of a plurality of cells.
  • Wireless communication technology has been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing.
  • new technological evolution is required to be competitive in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.
  • LTE-Advanced LTE-Advanced
  • LTE-A is for defining a technical specification of Release 10 of the "3rd Generation Partnership Project; Technical Specification Group Radio Access Network”.
  • the LTE-A system aims to support broadband up to 100 MHz.
  • LTE-A system is to use a carrier aggregation (carrier aggregation or bandwidth aggregation) technology that achieves a broadband by using a plurality of component carriers.
  • Carrier aggregation allows a plurality of component carriers to be used as one large logical frequency band in order to use a wider frequency band.
  • the bandwidth of each component carrier may be defined based on the bandwidth of the system block used in the LTE system.
  • Each component carrier is transmitted using a component carrier.
  • multiple component carriers for example, carrier aggregation up to 100 MHz, support for up to five downlink component carriers, and up to five
  • the existing LTE Rel-8 system is designed for single layer and single component carriers for downlink or uplink. There is a need for a method for effectively supporting such multiple component carriers and / or transport blocks and / or multiple codewords.
  • the present invention proposes a channel selection method for transmitting ACK and NACK for a specific component carrier through different PUCCH resources in order to effectively support a plurality of component carriers in a wireless communication system to which a carrier aggregation technique is applied.
  • a method for transmitting response information by a terminal includes receiving downlink data from each of the plurality of downlink resources from a base station, and receiving response information for the plurality of downlink resources. And transmitting through one uplink resource, wherein the one uplink resource includes a first HARQ resource and a second HARQ resource for transmitting the response information, and includes a plurality of downlink resources.
  • the response information is mapped to the first HARQ resource
  • all response information about the plurality of downlink resources is configured as NACK
  • the response information is mapped to the second HARQ resource. Can be.
  • the modulation bits corresponding to the response information mapped to the first HARQ resource and the modulation bits corresponding to the response information mapped to the second HARQ resource are different from each other, and correspond to response information mapped to the first HARQ resource.
  • the modulation bit may be '11', and the modulation bit corresponding to the response information mapped to the second HARQ resource may be '00'.
  • the response information on the plurality of downlink resources includes Discontinuous Transmission (DTX) information on a specific downlink resource among the plurality of downlink resources
  • the response information may be mapped to the first HARQ resource.
  • DTX Discontinuous Transmission
  • the response information on the plurality of downlink resources includes DTX (Discontinuous Transmission) information on a specific downlink resource among the plurality of downlink resources
  • the one uplink resource is a third to which the response information is mapped. It may further include HARQ resources.
  • the first HARQ resource and the second HARQ resource may be resources that are identified based on at least one of time, frequency, and code in a PUCCH (Physical Uplink Control Channel) transmitted through the one uplink resource.
  • PUCCH Physical Uplink Control Channel
  • the response information for the plurality of downlink resources is response information for data in one or more downlink subframes in the downlink resource, and the response information for the plurality of downlink resources is in downlink resource. It may also be generated by bundling among a plurality of response information of the.
  • a terminal for transmitting response information includes a receiver for receiving downlink data from each of the plurality of downlink resources from a base station, and response information for the plurality of downlink resources.
  • the response information is mapped to the first HARQ resource
  • the response information for the plurality of downlink resources are all configured as NACK, the response information is mapped to the second HARQ resource.
  • FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system.
  • FIG. 2 illustrates a block diagram of a transmitter and a receiver for OFDMA and SC-FDMA.
  • 3 is a diagram illustrating the structure of a radio frame used in LTE.
  • FIG. 4 illustrates an example of performing communication in a single component carrier situation.
  • FIG 5 illustrates the structure of an uplink subframe used in LTE.
  • FIG. 6 illustrates a PUCCH structure for transmitting ACK / NACK.
  • FIG. 7 is a diagram illustrating an example of determining a PUCCH resource for ACK / NACK signal transmission.
  • FIG. 8 is a diagram illustrating an example of performing communication under a multi-carrier situation.
  • FIG. 9 illustrates an example of using different PUCCH resources for a specific component carrier.
  • FIG. 10 illustrates an example in which ACK and NACK of a specific component carrier use different PUCCH resources.
  • 11A and 11B illustrate an example of using two PUCCH resources for ACK and NACK for a plurality of component carriers.
  • 12A to 12C illustrate an example of using three PUCCH resources for ACK and NACK for two component carriers.
  • 13A and 13B illustrate an example of using three PUCCH resources for ACK and NACK for three component carriers.
  • FIG. 14 is a diagram illustrating a base station and a terminal that can be applied to an embodiment in the present invention.
  • a system in which a system band uses a single component carrier is referred to as a legacy system or a narrowband system.
  • a system in which the system band includes a plurality of component carriers and uses at least one or more component carriers as a system block of the legacy system is referred to as an evolved system or a wideband system.
  • the component carrier used as the legacy system block has the same size as the system block of the legacy system.
  • the size of the remaining component carriers is not particularly limited. However, for system simplification, the size of the remaining component carriers may also be determined based on the system block size of the legacy system.
  • the 3GPP LTE system and the 3GPP LTE-A system are in a relationship between a legacy system and an evolved system.
  • the 3GPP LTE system is referred to herein as an LTE system or a legacy system.
  • the terminal supporting the LTE system is referred to as an LTE terminal or a legacy terminal.
  • the 3GPP LTE-A system is referred to as LTE-A system or evolved system.
  • a terminal supporting the LTE-A system is referred to as an LTE-A terminal or an evolved terminal.
  • the present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, but this is an example and the embodiment of the present invention can be applied to any communication system corresponding to the above definition.
  • transmitters 202-214 are terminals and receivers 216-230 are part of a base station.
  • receivers 216-230 are part of a base station.
  • the transmitter is part of the base station and the receiver is part of the terminal.
  • an OFDMA transmitter includes a serial to parallel converter 202, a sub-carrier mapping module 206, an M-point inverse discrete fourier transform (IDFT) module, and the like. 208, a cyclic prefix (CP) addition module 210, a parallel to serial converter (212) and a Radio Frequency (RF) / Digital to Analog Converter (DAC) module 214. .
  • CP cyclic prefix
  • RF Radio Frequency
  • DAC Digital to Analog Converter
  • Signal processing in the OFDMA transmitter is as follows. First, a bit stream is modulated into a data symbol sequence.
  • the bit stream may be obtained by performing various signal processing such as channel encoding, interleaving, scrambling, etc. on the data block received from the medium access control (MAC) layer.
  • the bit stream is also called a codeword (codeword) and is equivalent to a block of data received from the MAC layer.
  • the data block received from the MAC layer is also called a transport block.
  • the modulation scheme may include, but is not limited to, Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and M-ary Quadrature Amplitude Modulation (m-QAM).
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • m-QAM M-ary Quadrature Amplitude Modulation
  • the serial data symbol sequences are converted N by N in parallel (202).
  • the N data symbols are mapped to the allocated N subcarriers among the total M subcarriers, and the remaining M-N carriers are padded with zeros (206).
  • Data symbols mapped to the frequency domain are converted to time domain sequences through M-point IDFT processing (208).
  • an OFDMA symbol is generated by adding a CP to the time-domain sequence.
  • the generated OFDMA symbols are converted 212 in parallel to serial.
  • the OFDMA symbol is transmitted to the receiver through the process of digital-to-analog conversion, frequency upconversion, etc. (214).
  • the other user is allocated an available subcarrier among the remaining M-N subcarriers.
  • the OFDMA receiver includes an RF / ADC (Analog to Digital Converter) module 216, a serial / parallel converter 218, a Remove CP module 220, an M-point Discrete Fourier Transform (DFT) module 222, Subcarrier demapping / equalization module 224, bottle / serial converter 228, and detection module 230.
  • the signal processing of the OFDMA receiver consists of the inverse of the OFDMA transmitter.
  • the SC-FDMA transmitter further includes an N-point DFT module 204 before the subcarrier mapping module 206 as compared to the OFDMA transmitter.
  • SC-FDMA transmitter can significantly reduce the peak-to-average power ratio (PAPR) of the transmission signal compared to the OFDMA scheme by spreading a plurality of data in the frequency domain through the DFT prior to IDFT processing.
  • the SC-FDMA receiver further includes an N-point IDFT module 226 after the subcarrier demapping module 224 as compared to the OFDMA receiver.
  • the signal processing of the SC-FDMA receiver consists of the inverse of the SC-FDMA transmitter.
  • 3 is a diagram illustrating a structure of a radio frame used in LTE.
  • a radio frame has a length of 10 ms (327200? Ts) and consists of 10 equally sized subframes.
  • Each subframe has a length of 1 ms and consists of two slots.
  • Each slot has a length of 0.5ms (15360? Ts).
  • the slot includes a plurality of OFDMA (or SC-FDMA) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • one resource block includes 7 or 6 OFDMA (or SC-FDMA) symbols over 12 subcarriers.
  • the number of OFDMA (or SC-FDMA) symbols in one resource block depends on the length of a CP (normal cyclic prefix or extended cyclic prefix) used.
  • a transmission time interval (TTI) which is a unit time in which data is transmitted, may be determined in units of one or more subframes.
  • TTI transmission time interval
  • the structure of the above-described radio frame is only an example, and the number of subframes in the radio frame, the number of slots in the subframe, and the number of OFDMA (or SC-FDMA) symbols in the slot may be variously changed.
  • 4 is a diagram illustrating an example of performing communication in a single configuration carrier situation. 4 may correspond to a communication example of an LTE system.
  • FDD frequency division duplex
  • data transmission and reception are performed through one downlink band and one uplink band corresponding thereto.
  • the radio frame structure of FIG. 4 is used only for downlink transmission or uplink transmission.
  • TDD time division duplex
  • the same frequency band is divided into a downlink section and a corresponding uplink section in the time domain.
  • the radio frame structure of FIG. 4 is divided for downlink transmission and uplink transmission corresponding thereto.
  • control information eg, scheduling information
  • the downlink control channel includes a physical downlink control channel (PDCCH).
  • the terminal receives scheduling information (eg, data allocated to the data, data size, coding scheme, redundancy version, etc.) through the control channel, and then receives scheduled data through the downlink shared channel indicated by the scheduling information. can do.
  • the downlink shared channel includes a Physical Uplink Channel (PDSCH).
  • the terminal may transmit a reception response signal (eg, HARQ ACK / NACK, DTX) for the downlink data to the base station through an uplink control channel set in the control region of the uplink subframe.
  • the uplink control channel includes a PUCCH (Physical Uplink Control Channel).
  • PUCCH Physical Uplink Control Channel
  • HARQ ACK / NACK is simply indicated as an ACK / NACK signal.
  • the base station After receiving an ACK / NACK signal from the terminal, the base station retransmits the downlink data indicated by NACK or DTX.
  • the HARQ process may be performed for each transport block corresponding to each downlink data.
  • 5 is a diagram illustrating a structure of an uplink subframe used in LTE.
  • an uplink subframe includes a plurality (eg, two) slots.
  • the slot may include different numbers of SC-FDMA symbols according to the 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 a data signal such as voice.
  • the control region includes a PUCCH and is used to transmit control information.
  • the control information includes ACK / NACK, CQI, PMI, RI, and the like.
  • PUSCH and PUCCH are not simultaneously transmitted in one UE in LTE. Table 1 below shows the characteristics of the PUCCH format described in 3GPP TS 36.211 Release-8.
  • Table 1 PUCCH format Modulation scheme Number of bits per subframe, M bit One N / A N / A 1a BPSK One 1b QPSK 2 2 QPSK 20 2a QPSK + BPSK 21 2b QPSK + BPSK 22
  • FIG. 6 is a diagram illustrating a PUCCH structure for transmitting ACK / NACK.
  • ACK / NACK in the case of a normal CP, three consecutive symbols located in the middle of a slot carry a reference signal UL RS, and control information (ie, ACK / NACK) is carried on the remaining four symbols.
  • the slot includes six symbols and reference signals are carried on the third and fourth symbols.
  • ACK / NACK from a plurality of terminals is multiplexed onto one PUCCH resource using a CDM scheme.
  • the CDM scheme is implemented using a cyclic shift (CS) of a sequence for frequency spread and / or an orthogonal cover sequence for time spread.
  • ACK / NACK is a different Cyclic Shift (CS) (frequency spread) and / or a different Walsh / DFT orthogonal cover sequence (CG-CAZAC) sequence of Computer Generated Constant Amplitude Zero Auto Correlation. Time spreading).
  • CS Cyclic Shift
  • CG-CAZAC Walsh / DFT orthogonal cover sequence
  • the w0, w1, w2, w3 multiplied after the IFFT is multiplied before the IFFT.
  • a PUCCH resource for transmitting ACK / NACK is represented by a combination of positions of frequency-time resources (eg, resource blocks), cyclic shift of a sequence for frequency spreading, and an orthogonal cover sequence for time spreading, and each PUCCH. Resources are indicated using PUCCH (Resource) Index.
  • FIG. 7 is a diagram illustrating an example of determining a PUCCH resource for ACK / NACK signal transmission.
  • the PUCCH resources for ACK / NACK are not pre-allocated to each UE, and a plurality of PUCCH resources are divided and used at every time point by a plurality of terminals in a cell.
  • the PUCCH resource used by the UE to transmit ACK / NACK corresponds to a PDCCH carrying scheduling information for a corresponding downlink data (PDSCH).
  • the entire region in which the PDCCH is transmitted in each downlink subframe consists of a plurality of control channel elements (CCEs), and the PDCCH transmitted to the UE consists of one or more CCEs.
  • the UE transmits ACK / NACK through a PUCCH resource corresponding to a specific CCE (eg, first or lowest CCE) among CCEs configuring the PDCCH received by the UE.
  • a specific CCE eg, first or lowest C
  • each rectangle in a downlink component carrier represents a CCE
  • each rectangle in an uplink component carrier represents a PUCCH resource.
  • Each PUCCH index corresponds to a PUCCH resource for ACK / NACK. If it is assumed that the information on the PDSCH is transmitted through the PDCCH configured to 4 ⁇ 6 CCE as shown in Figure 7, the UE ACK / NACK through the 4 PUCCH corresponding to the 4 CCE, the first CCE constituting the PDCCH Send it.
  • FIG. 6 illustrates a case in which up to M PUCCHs exist in a UL CC when up to N CCEs exist in a downlink component carrier.
  • N may be M, but it is also possible to design M and N values differently and to overlap the mapping of CCE and PUCCH.
  • the PUCCH resource index in the LTE system is determined as follows.
  • n (1) PUCCH represents a PUCCH resource index for transmitting ACK / NACK
  • N (1) PUCCH represents a signaling value received from the upper layer
  • n CCE is the most of the CCE index used for PDCCH transmission Represents a small value.
  • 8 is a diagram illustrating an example of performing communication under a multiple carrier configuration. 8 may correspond to an example of communication of the LTE-A system.
  • the LTE-A system uses a carrier aggregation or bandwidth aggregation technique that collects a plurality of uplink / downlink frequency blocks and uses a larger uplink / downlink bandwidth to use a wider frequency band. Each frequency block is transmitted using a component carrier (CC).
  • CC component carrier
  • five 20 MHz component carriers may be gathered in the up / down link to support 100 MHz bandwidth.
  • Component carriers may be contiguous or non-contiguous in the frequency domain.
  • the radio frame structure illustrated in FIG. 3 may be equally applied even when using a multi-component carrier.
  • the radio frame, subframe, and slot are time units, for example, the base station and the terminal may transmit and receive signals through a plurality of component carriers on one subframe.
  • FIG. 8 illustrates a case where both the bandwidth of the uplink component carrier and the bandwidth of the downlink component carrier are the same and symmetrical. However, the bandwidth of each component carrier can be determined independently.
  • the bandwidth of the uplink component carrier may be configured as 5 MHz (UL CC0) + 20 MHz (UL CC1) + 20 MHz (UL CC2) + 20 MHz (UL CC3) + 5 MHz (UL CC4).
  • asymmetrical carrier aggregation is possible in which the number of UL CCs and the number of downlink component carriers are different. Asymmetric carrier aggregation may occur due to the limitation of available frequency bands or may be artificially established by network configuration.
  • the uplink signal and the downlink signal are illustrated as being transmitted through one-to-one mapped component carriers, the component carriers through which signals are actually transmitted may vary according to network settings or types of signals.
  • the component carrier on which the scheduling command is transmitted and the component carrier on which data is transmitted according to the scheduling command may be different.
  • the up / downlink control information may be transmitted through a specific uplink / downlink component carrier regardless of mapping between component carriers.
  • the UE when the number of uplink component carriers is smaller than the number of downlink component carriers, the UE should transmit ACK / NACK for a plurality of downlink PDSCH transmissions through fewer uplink PUCCHs.
  • ACK / NACK for a plurality of downlink PDSCH transmissions may be configured to be transmitted only through a specific uplink component carrier.
  • the terminal receives a plurality of transport blocks when using a multiple input multiple output (MIMO) transmission scheme or operating in TDD. In this case, the terminal should transmit the ACK / NACK signal for a plurality of transport blocks through a limited PUCCH resource.
  • MIMO multiple input multiple output
  • the method of transmitting a response signal assumes that a plurality of PUCCH resources for transmitting an ACK / NACK signal are located in the same physical resource block, but is not limited thereto. Even if it is within a certain frequency range, PUCCH resources located in other physical resource blocks may be applicable as long as channel state similarities exist.
  • the present invention may be applied to a response to download data (eg, PDSCH) or download control channel (eg, PDCCH), and upload data (eg, PUSCH) or upload control channel (eg, PUCCH). ) May be applied to the response.
  • download data eg, PDSCH
  • download control channel eg, PDCCH
  • upload data eg, PUSCH
  • upload control channel eg, PUCCH
  • the channel through which the present invention is transmitted may also be download data (e.g., PDSCH) or download control channel (e.g., PDCCH), and upload data (e.g., PUSCH) or upload control channel (e.g., , PUCCH).
  • download data e.g., PDSCH
  • download control channel e.g., PDCCH
  • upload data e.g., PUSCH
  • upload control channel e.g., PUCCH
  • a DTX state of a terminal may occur. For example, when the base station schedules data only for N 'configuration carriers smaller than N when N configuration carriers are configured, the N-N' configuration carriers may be in a DTX state. As another example, when the terminal has a download assignment on a specific component carrier but fails to detect, the component carrier may be in a DTX state.
  • HARQ performance may be degraded. That is, it is not possible to find exact criteria for the selection of the HARQ method for retransmission (eg, 'chase combining' or 'the best redundancy version (RV)', etc.) and the selection of the MCS. Therefore, it is preferable to also transmit the DTX state in the ACK / NACK transmission.
  • the HARQ method for retransmission eg, 'chase combining' or 'the best redundancy version (RV)', etc.
  • the present invention can be applied not only to the case of transmitting the DTX state together when transmitting ACK / NACK, but also to the case of omitting the DTX state or sharing the DTX state as the NACK state.
  • 1 may indicate an ACK
  • 0 may indicate a NACK or DTX state in the bit level representation.
  • the unit in which ACK / NACK is transmitted may be each codeword, each component carrier file, or each subframe.
  • the unit in which the ACK / NACK is transmitted may be a result after performing various ACK / NACKs (bundling, omission, or the number of ACKs, etc.) on the spatial domain / frequency domain / time domain. .
  • the ACK / NACK response transmitted through the uplink of the LTE system is an ACK / NACK response for a PDSCH with a corresponding PDCCH allocated with a PDCCH corresponding to a specific UE, and a DL SPS (Semi-persistent) indicated to the specific UE.
  • a DL SPS Semi-persistent
  • ACK / NACK response to PDCCH indicating downlink SPS release (PDCCH) for release of scheduling PDSCH allocated without a PDCCH corresponding to a specific UE (PDSCH without a corresponding PDCCH, which means PDSCH allocated to SPS)
  • PDCCH downlink SPS release
  • PDSCH PDSCH allocated without a PDCCH corresponding to a specific UE
  • ACK / NACK There are three cases of an ACK / NACK response to. However, for the sake of convenience of description, it is collectively described as ACK / NACK for data without this specific division.
  • the receiver When data is transmitted from the transmitter to the receiver, the receiver performs a decoding process of the data. If the decoding process succeeds, the receiving end transmits an ACK to the transmitting end, and if it fails, transmits an NACK.
  • the transmitting end may transmit a plurality of data within a range of allocated resources (eg, frequency, time, code, etc.), and the receiving end may also transmit a plurality of data within a range of allocated resources.
  • ACK / NACK transmission corresponds to one HARQ transmission resource for ACK / NACK for each data.
  • the transmitting end may transmit a plurality of data, and thus the receiving end should transmit as many ACK / NACKs as the number of data to the transmitting end.
  • the plurality of data may mean data in a plurality of downlink subframes. Therefore, in this case, a method for transmitting a plurality of ACK / NACK bits is needed, and a large amount of power must be consumed for ACK / NACK transmission.
  • ACK / NACK bundling and ACK / NACK multiplexing have been proposed.
  • ACK / NACK channel selection which is one of several methods for multiplexing ACK / NACK, is collectively described as ACK / NACK multiplexing.
  • ACK / NACK bundling is a method of combining ACK / NACKs related to a plurality of data through a logical AND operation. For example, the receiving end transmits an ACK only after successfully decoding all data. Otherwise, the receiving end transmits a NACK or no signal.
  • ACK / NACK multiplexing refers to a combination of ACK / NACKs related to a plurality of data, that is, an ACK / NACK sequence with a HARQ transmission resource for quadrature phase shift keying (QPSK) symbol for ACK / NACK transmission.
  • QPSK quadrature phase shift keying
  • HARQ-ACK means ACK / NACK for the i-th data unit
  • DTX Discontinuous Transmission
  • the receiver maps the ACK / NACK of (1, 1) to the QPSK modulation symbol and uses the PUCCH resource corresponding to n (1) PUCCH, 1 to the transmitter. Send. Also, if the receiver receives two data but the first data fails and only the second data succeeds, the receiver maps an ACK / NACK of (0, 0) to the QPSK modulation symbol and n (1) PUCCH. A PUCCH resource corresponding to , 1 is used to transmit to the transmitter. Such ACK / NACK multiplexing can be extended even when a larger number of data are received.
  • the tables applicable to three data and four data are LTE standard TS 36.213 Table 10.1.3-3 and Table 10.1.3-, respectively. 4 is disclosed.
  • the term 'component carrier' is used for convenience of description, but the component carrier used may be used as a cell.
  • the cell is a combination of downlink resources and optionally uplink resources.
  • the link between the carrier frequency of the downlink resource and the carrier resource of the uplink resource appears in the system information transmitted to the downlink resource.
  • the invention may be applied to a response to downlink data (eg, PDSCH) or downlink control channel (eg, PDCCH), and uplink data (eg, PUSCH) or uplink control channel (eg For example, it may be applied to the response to the PUCCH.
  • downlink data eg, PDSCH
  • downlink control channel eg, PDCCH
  • uplink data eg, PUSCH
  • uplink control channel eg
  • it may be applied to the response to the PUCCH.
  • the channel through which the present invention is transmitted may also be downlink data (e.g., PDSCH) or DL control channel (e.g., PDCCH), and UL data (e.g., PUSCH) or UL control channel (e.g., For example, it may be PUCCH.
  • PDSCH downlink data
  • DL control channel e.g., PDCCH
  • UL data e.g., PUSCH
  • UL control channel e.g., For example, it may be PUCCH.
  • the PUCCH resource means a HARQ resource for transmitting ACK / NACK, and is a concept including not only a physical time / frequency resource that can be distinguished but also a code resource.
  • a / N for a plurality of downlink component carriers may be transmitted through one primary uplink component carrier.
  • one primary uplink resource may include a plurality of HARQ resources for transmitting the A / N information.
  • the UE may implicitly or explicitly recognize transmitting A / N for a plurality of downlink component carriers in an uplink PUCCH resource.
  • the PUCCH resource for transmitting A / N for a plurality of downlink component carriers may be known by the UE from a single PUCCH resource previously transmitted as in LTE Rel-8 by a predetermined rule, or PHY or RRC signaling It may be instructed by the terminal through such.
  • the probability that ACK is incorrectly detected as NACK or DTX is 1%, while the target of probability that NACK is incorrectly detected as ACK is assumed to be lower than 0.1%. This means that if ACK is incorrectly detected as NACK or DTX, unnecessary retransmission occurs, which wastes physical resources, whereas when NACK is incorrectly detected as ACK, no actual retransmission is required (for the original data). This is because the receiving end fails to receive the information related to the A / N correctly.
  • the present invention proposes a method for minimizing the effects of errors due to such fading channels, noise, interference, path loss, and the like. That is, a channel selection method for minimizing the effects of errors due to fading channel, noise, interference, power reduction (path loss, etc.) of the signal by transmitting ACK and NACK for a specific component carrier through different PUCCH resources Suggest.
  • FIG 9 illustrates an example in which different PUCCH resources are used for a detected downlink component carrier.
  • PUCCH resources and constellations as shown in FIG. 9A may be used.
  • a / N information is transmitted in a PUCCH resource corresponding to a detected CC.
  • the DTX information is already included, there is no need to distinguish separately.
  • PUCCH resources and constellations as shown in FIG. 9B may be used.
  • a / N information is transmitted in a PUCCH resource corresponding to the detected component carrier.
  • the DTX information is already included, there is no need to distinguish separately.
  • response information (A / N) for the component carriers may be transmitted to different PUCCH resources for each component carrier. Therefore, although the embodiment illustrated in FIG. 9 is allocated to different PUCCH resources for each component carrier, ACK and NACK for the same component carrier are allocated to the same PUCCH resource.
  • a method of allocating ACK and NACK for a component carrier to different PUCCH resources may be used.
  • one or more of the following methods may be applied, and the configuration of a configuration carrier (for example, the set number of configuration carriers, the number of detected configuration carriers, the number of received configuration carriers, the activated configuration carrier) It is also possible to apply different methods according to the number).
  • a configuration carrier for example, the set number of configuration carriers, the number of detected configuration carriers, the number of received configuration carriers, the activated configuration carrier
  • ACK / NACK for one component carrier may be transmitted through different PUCCH resources.
  • a channel selection method it is possible to lower the possibility of detecting a relative error of ACK and NACK on a specific component carrier.
  • the case of both ACK and all NACK may be transmitted through different PUCCH resources.
  • a channel selection method it is possible to lower the possibility of detecting a relative error for the case where all component carriers are ACK and the case where all component carriers are NACK.
  • all ACK and all NACK may be transmitted through different PUCCH resources.
  • a channel selection method it is possible to lower the possibility of detecting a relative error for the case where all subframes are ACK and when all subframes are NACK.
  • all of ACK and all of NACK may be transmitted through different PUCCH resources. have.
  • a channel selection method it is possible to lower the possibility of detecting a relative error in the case where all component carriers and all subframes are ACK and when all component carriers and all subframes are NACK.
  • ACK and NACK are mixed (eg, A / N and N / A, etc.) are possible differently. It may be transmitted through a PUCCH resource. Through such a channel selection method, it is possible to reduce the likelihood that a response to a specific component carrier (s) is erroneously detected in the ACK and NACK mixed response and its effect.
  • component carrier 1 may be configured to be determined as an ACK. That is, it may be configured to allocate ACK or NACK information of a specific configuration carrier to a specific PUCCH resource.
  • FIG. 10 is a diagram illustrating an example in which A / N of a specific component carrier is transmitted through different PUCCH resources.
  • ACK and NACK of two specific component carriers are transmitted through different PUCCH resources.
  • the PUCCH resource combination corresponding thereto may also be applied differently according to the index of the component carrier.
  • the DTX information is already included, there is no need to distinguish separately.
  • ACK and NACK of three specific component carriers are transmitted through different PUCCH resources.
  • ACK and NACK of each of the first component carriers are allocated to different PUCCH resources, and the ACK and NACK of each of the other second and third component carriers do not overlap with each other. It may be allocated to the PUCCH resource and delivered.
  • 11A and 11B are examples of using two PUCCH resources.
  • a response is transmitted through different PUCCH resources. That is, in case of A / A, it is transmitted in PUCCH 1 resource, and in case of N / N, it is transmitted in PUCCH 2 resource.
  • a response (A / N or N / A) is also transmitted through different PUCCH resources. That is, in case of A / N, it is delivered in PUCCH 1 resource, and in case of N / A, it is delivered in PUCCH 2 resource.
  • the response value for at least the first component carrier is ACK regardless of the constellation, and correlates to the constellation when a signal is received in the PUCCH 2 resource. It can be seen that at least the response value for the first component carrier is NACK.
  • FIG. 11B the same method as in FIG. 11A is applied, but the constellation is applied differently.
  • Various constellations may be applied to the present invention, and various embodiments may be included according to the constellations.
  • 12A to 12C illustrate an example of using three PUCCH resources.
  • FIG. 12A illustrate an example of channel selection for transmitting response signals for three configured downlink carriers.
  • the response signal is transmitted using three PUCCH resources (PUCCH 1 resource, PUCCH 2 resource, PUCCH 3 resource).
  • both ACK (A / A) and NACK (N / N) are transmitted on different PUCCH resources.
  • different information (A / N and N / A) in which ACK and NACK are mixed is transmitted through different PUCCH resources.
  • a specific UE uses only two PUCCH resources among three PUCCH resources.
  • a specific UE uses all PUCCH resources.
  • N / A and N / N may be used more robustly for an error that may occur when transmitting a response signal in the case of N / A and N / N as using different PUCCH resources.
  • FIG. 12C Similar to FIG. 12B, the example of FIG. 12C also uses all three PUCCH resources. In this case, A / A and A / N may be different from each other by using different PUCCH resources, and thus, the A / A and A / N may be more robustly used for errors that may occur in response signal transmission in the case of A / A and A / N.
  • 13A and 13B show an example of using three PUCCH resources in A / N for three component carriers. 13A and 13B show various examples of allocating other PUCCH resources for three component carriers.
  • a response for all configuration carriers is ACK and a response for all configuration carriers is NACK
  • a response is transmitted through different PUCCH resources.
  • the response to the component carrier is mixed with ACK and NACK (A / N or N / A)
  • the response is also transmitted through different PUCCH resources.
  • the first component carrier is ACK regardless of its constellation.
  • the signal of the PUCCH 1 resource is a BPSK type (eg, a real number such as + 1 / -1)
  • the second component carrier is also an ACK.
  • the second component carrier may be ACK regardless of its constellation.
  • the response when all component carriers are ACK and when all component carriers are NACK is transmitted through different PUCCH resources.
  • ACK and NACK for a component carrier are mixed, a response of (A / N or N / A) is also transmitted through different PUCCH resources. Therefore, it is possible to minimize the relative error between A / A and N / N and the effect of the error, the relative error with A / N and N / A and the effect of the error.
  • the first component carrier is ACK regardless of its constellation.
  • the second component carrier may be ACK regardless of its constellation.
  • the signal of the PUCCH 2 resource is a BPSK type (eg, a real number such as + 1 / -1, etc.), it can be seen that the first component carrier is NACK.
  • a DTX-to-ACK error and an ACK-to-DTX error may occur within the same PUCCH resource.
  • the ACK-to-DTX error may cause unnecessary retransmission and cause resource waste.
  • the DTX-to-ACK error can be interpreted in two ways. In the case of a component carrier in which no scheduling occurs among a plurality of component carriers (DL DTX), since the base station already knows that it is a DTX, the DTX-to-ACK error has no meaning.
  • NACK-to-DTX error is meaningless in the case of DL DTX, otherwise problems may arise in the efficient use of HARQ technique. That is, there may be a problem in selecting a HARQ method such as chase combining or incremental redundancy (IR) in consideration of NACK or DTX.
  • IR incremental redundancy
  • the DTX-to-NACK error is meaningless in the case of DL DTX, otherwise, a problem may occur in using an efficient HARQ method similar to the previous NACK-to-DTX error.
  • the DTX may use a PUCCH resource other than ACK or NACK.
  • the number of PUCCH resources indicating an A / N response having specific configuration carriers or specific bits may have a limit. Therefore, as described above, it may be impossible to make the DTX use a PUCCH resource other than ACK or NACK.
  • the present invention proposes to transmit such a DTX state in the PUCCH resource to which the ACK is transmitted. That is, to distinguish DTX from NACK, it is proposed to transmit NACK and DTX in different PUCCH resources.
  • CA carrier aggregation
  • the present invention is applied to the field of allocating A / N for a plurality of component carriers to a limited PUCCH resource, and ACK and NACK for different component carriers may be allocated to different PUCCH resources.
  • HARQ-ACK means ACK / NACK for the data unit on the i-th component carrier, DTX (Discontinuous Transmission) as described above has not transmitted data corresponding to HARQ-ACK (i) This signal is for a case where the receiving end does not detect the presence of data corresponding to HARQ-ACK (i).
  • HARQ-ACK (0) and HARQ-ACK (1) which are ACK / NACK for different configuration carriers
  • PUCCH resources when all configuration carriers are ACK and all NACK.
  • the configuration of the data bits b (0) and b (1) is also distinguished from each other by '1, 1' and '0, 0'.
  • the response to the first component carrier (HARQ-ACK (0)) is ACK and the response to the second component carrier (HARQ-ACK (1)) is NACK
  • the response to the first component carrier ( ACK / NACK for HARQ-ACK (0)) and ACK / NACK for the case where the response to the second component carrier (HARQ-ACK (1)) is NACK are n (1) PUCCH, 0 and n (1), respectively. It can be seen that PUCCH resources are different from each other by PUCCH, 1 , and the configuration of modulation bits is also distinguished from each other by '1, 1' and '0, 0'.
  • the present invention is set to be transmitted through different PUCCH resources in case of all ACK and all NACK in response to a plurality of configuration carriers, and also in the case of ACK / NACK and NACK / ACK different PUCCH It is set to be transmitted through a resource, and this characteristic is consistent with the concept of Table 3 included in the LTE standard.
  • FIG. 14 illustrates a base station and a terminal that can be applied to an embodiment in the present invention.
  • a wireless communication system includes a base station (BS) 1410 and a terminal (UE) 1420.
  • the transmitter is part of the base station 1410 and the receiver is part of the terminal 1420.
  • the transmitter is part of the terminal 1420 and the receiver is part of the base station 1410.
  • the base station 1410 and / or the terminal 1420 may have a single antenna or multiple antennas.
  • the terminal 1420 includes a processor 1422, a memory 1424, and an RF unit 1426.
  • the processor 1422 may be configured to implement the procedures and / or methods proposed by the present invention.
  • the memory 1424 is connected to the processor 1422 and stores various information related to the operation of the processor 1422.
  • the RF unit 1426 is coupled to the processor 1422 and transmits and / or receives wireless signals. That is, the RF unit 1426 includes a transmitting module and a receiving module.
  • Base station 1410 includes a processor 1412, a memory 1414, and a radio frequency (RF) unit 1416.
  • the processor 1412 may be configured to implement the procedures and / or methods proposed by the present invention.
  • the memory 1414 is connected with the processor 1412 and stores various information related to the operation of the processor 1412.
  • the RF unit 1416 is connected with the processor 1412 and transmits and / or receives wireless signals. That is, the RF unit 1416 includes a transmitting module and a receiving module.
  • embodiments of the present invention have been mainly described based on data transmission / reception relations between a terminal and a base station.
  • Certain operations described in this document as being performed by a base station may in some cases be performed by an upper node thereof. That is, it is obvious that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • 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.
  • 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.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, and the like.
  • 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.
  • the present invention can be applied to a wireless communication system. Specifically, the present invention can be applied to a method and apparatus for transmitting ACK / NACK information by a terminal to a base station in a wireless communication system to which carrier aggregation is applied.

Abstract

La présente invention porte sur un procédé dans lequel un terminal envoie des informations de réponse sur des porteuses composantes (CC) dans un système de communication sans fil qui prend en charge une pluralité de porteuses composantes. Le procédé comprend : une étape de réception de données de liaison descendante provenant d'une station de base par l'intermédiaire de chaque ressource de liaison descendante parmi une pluralité de ressources de liaison descendante ; et une étape d'envoi d'informations de réponse sur la pluralité de ressources de liaison descendante par l'intermédiaire d'une seule ressource de liaison montante, ladite ressource de liaison montante comprenant une première ressource HARQ et une seconde ressource HARQ pour transmettre les informations de réponse. Lorsque les informations de réponse sur la pluralité de ressources de liaison descendante sont entièrement constituées d'accusés de réception (ACK), les informations de réponse sont mappées à la première ressource HARQ. Lorsque les informations de réponse sur la pluralité de ressources de liaison descendante sont entièrement constituées d'accusés de réception négatifs (NACK), les informations de réponse sont mappées à la seconde ressource HARQ.
PCT/KR2011/004533 2010-06-22 2011-06-22 Procédé de transmission d'informations de réponse WO2011162539A2 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080076662A (ko) * 2007-02-14 2008-08-20 삼성전자주식회사 이동통신 시스템에서 하향링크 공용 제어채널을 송수신하는장치 및 방법
KR20090017450A (ko) * 2007-08-14 2009-02-18 엘지전자 주식회사 Ｐｈｉｃｈ 전송 자원 영역 정보 획득 방법 및 이를 이용한ｐｄｃｃｈ 수신 방법
KR20100044822A (ko) * 2007-07-06 2010-04-30 샤프 가부시키가이샤 이동 통신 시스템, 기지국 장치 및 이동국 장치

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Publication number Priority date Publication date Assignee Title
KR20080076662A (ko) * 2007-02-14 2008-08-20 삼성전자주식회사 이동통신 시스템에서 하향링크 공용 제어채널을 송수신하는장치 및 방법
KR20100044822A (ko) * 2007-07-06 2010-04-30 샤프 가부시키가이샤 이동 통신 시스템, 기지국 장치 및 이동국 장치
KR20090017450A (ko) * 2007-08-14 2009-02-18 엘지전자 주식회사 Ｐｈｉｃｈ 전송 자원 영역 정보 획득 방법 및 이를 이용한ｐｄｃｃｈ 수신 방법

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