WO2010123286A2 - Procédé et appareil servant à transmettre des informations ack/nack - Google Patents

Procédé et appareil servant à transmettre des informations ack/nack Download PDF

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Publication number
WO2010123286A2
WO2010123286A2 PCT/KR2010/002512 KR2010002512W WO2010123286A2 WO 2010123286 A2 WO2010123286 A2 WO 2010123286A2 KR 2010002512 W KR2010002512 W KR 2010002512W WO 2010123286 A2 WO2010123286 A2 WO 2010123286A2
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WIPO (PCT)
Prior art keywords
ack
information
nack
pucch
subspace
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PCT/KR2010/002512
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English (en)
Korean (ko)
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WO2010123286A3 (fr
Inventor
정재훈
권영현
한승희
김소연
Original Assignee
엘지전자 주식회사
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Priority to KR1020117024385A priority Critical patent/KR101241921B1/ko
Publication of WO2010123286A2 publication Critical patent/WO2010123286A2/fr
Publication of WO2010123286A3 publication Critical patent/WO2010123286A3/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
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements

Definitions

  • the present invention relates to a wireless communication system. Specifically, the present invention relates to a method and apparatus for transmitting an acknowledgment signal (eg, ACK / NACK).
  • an acknowledgment signal eg, ACK / NACK.
  • Wireless communication systems are widely deployed to provide various kinds of communication services such as voice and data.
  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, and orthogonal frequency division Orthogonal Frequency Division Multiple Access (OFDMA) system, Single Carrier Frequency Division Multiple Access (SC-FDMA) system, Multi Carrier Frequency Division Multiple Access (MC-FDMA) Multiple Access) system.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • MC-FDMA Multi Carrier Frequency Division Multiple Access
  • the base station may transmit a physical downlink shared channel (PDSCH) to the terminal through one or more downlink carriers.
  • PDSCH physical downlink shared channel
  • the terminal should feed back the ACK / NACK information or ACK / NACK / DTX information for one or more PDSCH received to the base station.
  • the present invention has been devised to satisfy the above requirements, and an object of the present invention is to provide a reliable data transmission / reception method.
  • Another object of the present invention is to provide a method and apparatus for transmitting ACK / NACK information for one or more downlink carriers.
  • Another object of the present invention is to provide a method and apparatus for selecting a PUCCH to transmit ACK / NACK information and mapping the ACK / NACK information to the selected PUCCH.
  • Another object of the present invention is to provide a method and apparatus for decoding a PUCCH to which ACK / NACK information is mapped.
  • the present invention discloses various methods and apparatuses for transmitting an acknowledgment signal (eg, ACK / NACK) in a wireless access system.
  • an acknowledgment signal eg, ACK / NACK
  • a method for transmitting ACK / NACK (ACKnowledgement / None-ACK) information in a wireless access system includes at least one physical uplink mapped to a first information subspace (eg, information subspace P). Selecting a PUCCH for transmitting ACK / NACK information from the control channels (PUCCHs) and a second information subspace (eg, information subspace Q) in a control symbol for transmitting ACK / NACK information included in the selected PUCCH.
  • the method may include mapping and transmitting ACK / NACK information to the selected PUCCH to the base station. In this case, the ACK / NACK information may be mapped to the first information subspace and the second information subspace according to the reliability of the ACK / NACK information.
  • a terminal receives control information for transmitting downlink data from a base station through a physical downlink control channel (PDCCH) and transmits downlink data to a physical downlink shared channel (PDSCH) based on the control information.
  • Receiving through) may further include.
  • one or more PUCCHs may be allocated to the UE according to the CCE index on which the PDCCH is transmitted.
  • a method of receiving ACK / NACK (ACKnowledgement / None-ACK) information in a wireless access system is mapped to a physical uplink control channel (PUCCH) through a non-coherent reception detection scheme. Detecting the ACK / NACK information based on the first information subspace and detecting ACNK / NACK information based on the second information subspace mapped to the PUCCH through coherent demodulation and decoding. can do. In this case, the ACK / NACK information may be mapped to the first information subspace and the second information subspace according to the reliability of the ACK / NACK information.
  • PUCCH physical uplink control channel
  • a mobile terminal for transmitting ACK / NACK (ACKnowledgement / None-ACK) information in a wireless access system includes a receiving module for receiving a radio signal, a transmission module for transmitting a radio signal, and an ACK / It may include a processor for controlling the transmission of the NACK information.
  • the processor selects a PUCCH for transmitting ACK / NACK information from one or more physical uplink control channels (PUCCHs) mapped to the first information subspace and transmits ACK / NACK information included in the selected PUCCH.
  • PUCCHs physical uplink control channels
  • mapping the second information subspace to the control symbols for the control information mapping the ACK / NACK information to the selected PUCCH, and transmitting the PUCCH to which the ACK / NACK information is mapped to the base station by controlling the transmission module.
  • the ACK / NACK information may be mapped to the first information subspace and the second information subspace according to the reliability of the ACK / NACK information.
  • the first information subspace may indicate a PUCCH index
  • the second information subspace may indicate a symbol index included in the PUCCH.
  • the reliability may be determined according to the frequency of occurrence of the ACK / NACK information, and may be determined as the probability of generating an individual ACK / NACK state from the probability of occurrence of the entire ACK / NACK state.
  • the first information space may be mapped based on the ACK information, and the second information space may be mapped based on the NACK information.
  • the ACK / NACK information may be mapped to DTX (Discontinuous). Transmission) may further include information.
  • the first to third embodiments are merely some of the preferred embodiments of the present invention, and various embodiments in which the technical features of the present invention are reflected will be described below by those skilled in the art. It can be derived and understood based on the detailed description of the invention.
  • the terminal and the base station can reliably transmit and receive data.
  • the terminal and the base station can efficiently transmit and receive ACK / NACK information even in a carrier overlapping environment.
  • the UE can efficiently transmit the ACK / NACK information by selecting the PUCCH to transmit the ACK / NACK information, mapping the ACK / NACK information to the selected PUCCH to transmit to the base station.
  • the base station can correctly acquire the ACK / NACK information mapped to the PUCCH by performing the associative decoding and non-associative decoding of the PUCCH.
  • 1 shows a network structure of an E-UMTS.
  • FIG. 2 illustrates a structure of a radio frame used in LTE.
  • FIG. 3 shows an example of performing communication in a single component carrier situation used in an LTE system.
  • FIG. 4 is a diagram illustrating a structure of an uplink subframe used in LTE.
  • 5 is a diagram illustrating a PUCCH structure for transmitting ACK / NACK.
  • FIG. 6 is a diagram illustrating one method of determining a PUCCH resource for ACK / NACK.
  • FIG. 7 is a diagram illustrating a method for performing communication in a multi-component carrier environment in an LTE-A system.
  • FIG. 8 is a diagram illustrating an example of an information space mapping method provided when the ACK / NACK resource selection method of the present invention is applied.
  • FIG. 9 is a diagram illustrating a conceptual example of a method for mapping an information space and a feedback information index defined by a specific transmission scheme of a terminal according to an embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a terminal transmission and a base station reception when a PUCCH is transmitted by applying an ACK / NACK channel selection method as one of ACK / NACK transmission methods for downlink data according to an embodiment of the present invention.
  • FIG. 11 is a block diagram of a transmitter and a receiver for OFDMA and SC-FDMA as an embodiment of the present invention.
  • FIG. 12 is a diagram illustrating a mobile station and a base station in which the embodiments of the present invention described with reference to FIGS. 2 to 11 may be performed.
  • Embodiments of the present invention disclose various methods and apparatuses for transmitting ACK / NACK signals for use in a wireless communication system.
  • each component or feature may be considered to be optional unless otherwise stated.
  • Each component or feature may be embodied in a form that is not combined with other components or features.
  • some components and / or features may be combined to form an embodiment of the present invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.
  • the base station is meant as a terminal node of a network that directly communicates with a mobile station.
  • the specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.
  • various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by the base station or network nodes other than the base station.
  • the 'base station' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS), or an access point.
  • a 'mobile station' may be a user equipment (UE), a subscriber station (SS), a mobile subscriber station (MSS), a mobile terminal, an advanced mobile station (AMS) or a terminal. (Terminal), etc. may be substituted.
  • UE user equipment
  • SS subscriber station
  • MSS mobile subscriber station
  • AMS advanced mobile station
  • Terminal Terminal
  • the transmitting end refers to a fixed and / or mobile node that provides a data service or a voice service
  • the receiving end refers to a fixed and / or mobile node that receives a data service or a voice service. Therefore, in uplink, a mobile station may be a transmitting end and a base station may be a receiving end. Similarly, in downlink, a mobile station may be a receiving end and a base station may be a transmitting end.
  • Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802.xx system, 3GPP system, 3GPP LTE system and 3GPP2 system. That is, obvious steps or portions not described among the embodiments of the present invention may be described with reference to the above documents.
  • Embodiments of the present invention may be used in various radio access technologies such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, MC-FDMA.
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), and the like.
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of Evolved UMTS (E-UMTS) using E-UTRA.
  • LTE-Advanced refers to an evolved version of 3GPP LTE.
  • 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.
  • 1 shows a network structure of an E-UMTS.
  • E-UMTS is also called LTE system.
  • LTE Long Term Evolution
  • E-UMTS is also called LTE system.
  • technical specifications of UMTS and E-UMTS refer to Release 7 and Release 8 of the "3rd Generation Partnership Project; Technical Specification Group Radio Access Network", respectively.
  • an E-UMTS is a connection gateway that is located at an end of a user equipment (UE) 120, a base station (eNB: eNode B; 110a and 110b), and a network (E-UTRAN).
  • UE user equipment
  • eNB eNode B
  • E-UTRAN network
  • the base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
  • One or more cells may exist in one base station.
  • the cell may be set to one of bandwidths such as 1.25, 2.5, 5, 10, 15, and 20 MHz. Different cells can provide different bandwidths.
  • the base station may control data transmission and reception for a plurality of terminals. For example, the base station may transmit downlink scheduling information to each terminal for downlink (DL) data. That is, the base station informs the corresponding terminal of time / frequency domain, encoding, data size, and / or hybrid automatic repeat and reQuest (HARQ) related information through DL scheduling information.
  • DL downlink
  • HARQ hybrid automatic repeat and reQuest
  • the base station may transmit uplink scheduling information to each user equipment for uplink (UL) data. That is, the base station transmits the UL scheduling information to each terminal, it can inform the time / frequency domain, encoding, data size and / or HARQ related information that can be used by the terminal.
  • UL uplink
  • the core network may include 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.
  • FIG. 2 illustrates 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 may include 12 subcarriers x 7 (or 6) OFDMA (or SC-FDMA) symbols.
  • a transmission time interval which is a unit time for transmitting data, may be determined in units of one or more subframes.
  • 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.
  • FIG. 3 shows an example of performing communication in a single component carrier situation used in an LTE system.
  • a general frequency division multiplexing (FDD) wireless communication system performs data transmission and reception through one downlink band and one uplink band corresponding thereto.
  • the base station and the terminal transmit and receive data and / or control information scheduled in subframe units.
  • the uplink / downlink subframe carries signals through various physical channels.
  • FIG. 3 illustrates the FDD scheme for convenience, the above description may be applied to the TDD scheme by dividing the radio frame of FIG. 2 into uplink / downlink in the time domain.
  • the control region starts with the first OFDMA symbol of the subframe and includes one or more OFDMA symbols.
  • the size of the control region may be set independently for each subframe.
  • the control region is used to transmit L1 / L2 (layer 1 / layer 2) control signals.
  • the data area is used to transmit downlink traffic.
  • Control channels allocated to the control region include a physical control format indicator channel (PCFICH), a physical HARQ indicator channel (PHICH), and a physical downlink control channel (PDCCH). ) May be included.
  • PCFICH physical control format indicator channel
  • PHICH physical HARQ indicator channel
  • PDCCH physical downlink control channel
  • the PDCCH is allocated to the first n OFDMA symbols of a subframe. n is indicated by the PCFICH as an integer of 1 or more.
  • the PDCCH consists of one or more CCEs. Each CCE includes nine REGs, and each REG consists of four neighboring resource elements with the reference signal excluded.
  • a resource element is a minimum resource unit defined by one subcarrier x one symbol.
  • the PDCCH includes information related to resource allocation of a paging channel (PCH) and a downlink-shared channel (DL-SCH) which are transport channels, information related to an uplink scheduling grant and an HARQ. Notify each terminal or terminal group.
  • PCH paging channel
  • DL-SCH downlink-shared channel
  • PCH and DL-SCH are transmitted on the PDSCH.
  • Data of the PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode the PDSCH data is included in the PDCCH and transmitted.
  • a specific PDCCH is CRC masked with a Radio Network Temporary Identity (RNTI) of "A", a radio resource (eg, frequency location) of "B” and a transmission type information of "C" (eg, It is assumed that information on data transmitted using a transport block size, modulation scheme, coding information, etc.) is transmitted through a specific subframe.
  • RNTI Radio Network Temporary Identity
  • C transmission type information
  • the terminal of the cell monitors the PDCCH using the RNTI information it has, the terminal having the "A" RNTI receives the PDCCH, and the information on the "B” and “C” through the information of the received PDCCH It may receive a PDSCH indicated by.
  • a receiving node e.g., a receiving end, a receiver
  • Tx (transmitting) node e.g., transmitting end, transmitter
  • the receiving end transmits an acknowledgment (ACK) signal to the transmitting end when the decoding of the data unit succeeds, so that the transmitting end transmits a new data unit.
  • ACK acknowledgment
  • NACK negative acknowledgment
  • ARQ Automatic Repeat ReQuest
  • Hybrid ARQ is an advanced method of ARQ and combines ARQ and channel coding. HARQ can lower the error rate by combining the retransmitted data unit with the previously received data unit.
  • ACK / NACK (A / N) is transmitted by physical channel signaling.
  • Chase Combining (CC)
  • IR Incremental Redundancy
  • FIG. 4 is a diagram illustrating a structure of an uplink subframe used in LTE.
  • one uplink subframe includes two or more slots.
  • One slot may include different numbers of SC-FDMA symbols according to the length of the cyclic prefix (CP). For example, a slot may include 7 SC-FDMA symbols in the case of a normal CP, and 6 SC-FDMA symbols in the case of an extended CP.
  • CP cyclic prefix
  • 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 information related to an HARQ ACK / NACK signal, a channel quality indicator (CQI), precoding matrix indicators (PMI), and / or an RI.
  • CQI channel quality indicator
  • PMI precoding matrix indicators
  • 5 is a diagram illustrating a PUCCH structure for transmitting ACK / NACK.
  • uplink reference signals are carried on three consecutive symbols located in the middle of slots, and control information (ie, ACK / NACK) is carried on the remaining four symbols.
  • control information ie, ACK / NACK
  • the slot includes six symbols and a reference signal is carried on the third and fourth symbols.
  • ACK / NACK from multiple terminals is multiplexed onto one PUCCH resource using a CDM scheme.
  • the CDM scheme is implemented using Cyclic Shift (CS) of the sequence for frequency spreading and / or (quasi) orthogonal spreading code for time spreading.
  • CS Cyclic Shift
  • ACK / NACK is distinguished using different cyclic shifts (frequency spreading) and / or different Walsh / DFT orthogonal codes (time spreading) of a Computer Generated Constant Amplitude Zero Auto Correlation (CG-CAZAC) sequence. do.
  • CG-CAZAC Computer Generated Constant Amplitude Zero Auto Correlation
  • 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 (quasi) orthogonal code for time spreading.
  • Each PUCCH resource is indicated using a PUCCH (resource) index.
  • FIG. 6 is a diagram illustrating one method of determining a PUCCH resource for ACK / NACK.
  • PUCCH resources for ACK / NACK are dynamically allocated to each terminal. That is, the PUCCH resources are not allocated to each terminal in advance, and the plurality of PUCCH resources are divided and used at every time point by the plurality of terminals in the cell.
  • the PUCCH resource used by the UE to transmit ACK / NACK corresponds to a PDCCH carrying scheduling information about corresponding downlink data.
  • 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 may transmit ACK / NACK through a PUCCH resource corresponding to a specific CCE (eg, the first CCE) among the CCEs constituting the PDCCH received by the UE.
  • a specific CCE eg, the first CCE
  • each rectangle in downlink (DL) represents a CCE
  • each rectangle in uplink (UL) represents a PUCCH resource.
  • Each PUCCH index corresponds to a PUCCH resource for ACK / NACK.
  • the UE ACKs through the 4th PUCCH corresponding to the 4th CCE, the first CCE constituting the PDCCH. You can send / NACK.
  • FIG. 6 illustrates a case in which up to M PUCCHs exist in the UL when there are up to N CCEs in the DL.
  • 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.
  • the PUCCH index for ACK / NACK transmission is determined according to the first CCE for PDCCH transmission. Thereafter, a resource block (RB) index, an orthogonal cover index, and a cyclic shift value for PUCCH transmission are determined using the PUCCH index.
  • RB resource block
  • the base station reserves as many PUCCH resources as the number of CCEs used for PDCCH transmission, when more than one CCE is used for PDCCH transmission, the PUCCH index mapped to the remaining CCEs except for the first CCE is not used for PUCCH transmission. Will not. Occupied PUCCHs may be used for A / N transmission of other UEs.
  • FIG. 7 is a diagram illustrating a method for performing communication in a multi-component carrier environment in an LTE-A system.
  • the LTE-A system uses a carrier aggregation (CA) or a bandwidth aggregation (BA) technique that uses a larger uplink / downlink bandwidth of a plurality of uplink / downlink frequency blocks to use a wider frequency band.
  • CA carrier aggregation
  • BA bandwidth aggregation
  • Each frequency block is transmitted using a component carrier (CC).
  • CC component carrier
  • a component carrier may mean a frequency block or a center carrier of a frequency block for carrier aggregation according to a context, and these may be used interchangeably with each other.
  • CCs may be contiguous or non-contiguous in the frequency domain.
  • FIG. 7 illustrates a case in which a bandwidth of an uplink component carrier and a bandwidth of a downlink component carrier are the same and symmetrical for convenience.
  • the bandwidth of each component carrier can be determined independently.
  • the bandwidth of an 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 in which the number of uplink component carriers and the number of downlink component carriers are different may be possible.
  • Asymmetric carrier aggregation may occur due to the limitation of available frequency bands or may be artificially established by network configuration. For example, even if the entire system band is composed of N CCs, a frequency band that a specific UE can receive may be limited to M ( ⁇ N) CCs.
  • Various parameters for carrier aggregation may be set in a cell-specific, UE group-specific, or UE-specific manner.
  • FIG. 7 illustrates that an uplink signal and a downlink signal are transmitted through a one-to-one mapped component carrier
  • a component carrier in which a signal is actually transmitted may vary according to a network configuration or a type of signal.
  • a scheduling command when a scheduling command is transmitted downlink through DL CC1, data according to the scheduling command may be performed through another DL CC or UL CC.
  • control information related to the DL CC may be transmitted uplink through a specific UL CC regardless of mapping.
  • the downlink control information may similarly be transmitted through a specific DL CC.
  • the base station may transmit a physical downlink shared channel (PDSCH) signal to the terminal through one or more downlink carriers.
  • PDSCH physical downlink shared channel
  • the terminal should transmit an acknowledgment signal and / or feedback information indicating the reception status of the received one or more PDSCH to the base station.
  • ACK acknowledgment signal
  • NACK NACK
  • DTX DTX states
  • the ACK signal is information indicating that there is no error in the process of detecting a cyclic redundancy check (CRC) error after channel decoding of any transport block data on the PDSCH received by the UE, and the NACK signal on the PDSCH received by the UE Information indicating that there is an error in a process of detecting a cyclic redundancy check (CRC) error after channel decoding of arbitrary transport block data.
  • the DTX indicates that the UE-specific scheduling PDCCH (eg, DL channel allocation PDCCH or UL grant PDCCH) is not detected and thus does not send an acknowledgment signal itself in a situation in which a PDSCH to be received in the downlink subframe is not recognized. Information.
  • the UE In order to receive the PDSCH, the UE must decode the PDCCH. That is, the UE may acquire the presence or absence of PDSCH and decoding related information about the PDSCH by blind decoding the PDCCH (see description of FIG. 6).
  • the PDSCH reception state of the UE is in the "ACK” state when any one or two Transport Block data are received without error according to the downlink transmission mode on the PDSCH, and "NACK” when an error occurs.
  • "State, when the UE does not know whether to transmit the PDSCH based on an error in the blind decoding of the PDCCH associated with the PDSCH may be defined as a" DTX "state.
  • Embodiments of the present invention disclose various methods of feeding back ACK / NACK or DTX information related to these three DL data reception states to a base station.
  • the UE may feed back only ACK and NACK signals or may feed back ACK / NACK and DTX signals.
  • ACK / NACK information status is based on a single codeword transmission based on a single layer MIMO transmission, TxD or single antenna transmission (ie, a single transmission block and a single channel encoding).
  • ⁇ Can be defined in two states.
  • ⁇ (ACK, ACK), (ACK, NACK) , (NACK, ACK), (NACK, NACK) ⁇ four states can be defined.
  • the ACK / NACK state definition method in calculating the number of cases of the ACK / NACK state required according to the expansion of the number of DL CCs, the ACK / NACK basically defined according to the transmission method. Assuming the number of state representations is N and assuming that the number of DL CCs scheduled for PDSCH or the maximum number of schedulable DL CCs is M, the number of cases of the ACK / NACK state representation required is calculated by M power of N. Can be.
  • L eg, The number of ACK / NACK information states that may occur when a PDSCH to which a single codeword transmission is applied (or a PDSCH transmitted by a single codeword transmission method individually through L downlink component carriers) is transmitted. May be 2 L.
  • L terminals for example, When a PDSCH (or PDSCH transmitted in a 2 codeword (ie, 2 transport block) transmission scheme separately through L downlink component carriers) is transmitted in a 2 codeword (ie, 2 transport block) transmission scheme.
  • the number of cases in the ACK / NACK information state may be 4L .
  • the DTX occurs based on blind decoding failures as described above in the PDCCH present invention.
  • DTX is defined as a PDSCH unit regardless of the situation of one transport block or two transport blocks according to the PDSCH transmission scheme. Can be.
  • three states of ⁇ ACK, NACK, DTX ⁇ are defined when transmitting a single codeword, and ⁇ (ACK, ACK), (ACK, NACK), (NACK, ACK), ( NACK, NACK), and DTX ⁇ .
  • the ACK / NACK state representation basically defined according to the transmission scheme in calculating the number of ACK / NACK states required according to the expansion of the number of DL CCs. If the number of cases is assumed to be N and the number of DL CCs scheduled for PDSCH or the maximum number of schedulable DL CCs is M, the number of ACK / NACK state expressions required may be calculated by M power of N. have.
  • L eg, ACK / NACK / DTX based state that may occur when a PDSCH to which a single codeword transmission is applied (or a PDSCH transmitted by a single codeword transmission method individually through L downlink component carriers) is transmitted
  • the number of may be 3 L.
  • L terminals for example, When a PDSCH (or PDSCH transmitted in a 2 codeword (ie, 2 transport block) transmission scheme separately through L downlink component carriers) is transmitted in a 2 codeword (ie, 2 transport block) transmission scheme.
  • the number of cases in the ACK / NACK information state may be 5L .
  • the ACK / NACK / DTX state may be defined as shown in Table 1 below.
  • the base station transmits a plurality of data units to one or more terminals within a given amount of physical resources, and the one or more terminals transmit a plurality of corresponding ACK / NACK or ACK / NACK / DTX state information to the base station within a given amount of physical resources.
  • Can transmit Physical resources include frequency, time, space, code, or any combination thereof.
  • the terminal transmits ACK / NACK / DTX information corresponding to each data unit through a unit ACK / NACK / DTX resource.
  • the unit ACK / NACK / DTX (or ACK / NACK) resource is simply referred to as an ACK / NACK / DTX unit (or ACK / NACK unit).
  • the ACK / NACK / DTX unit (or ACK / NACK unit) may mean a PUCCH resource for ACK / NACK / DTX (or ACK / NACK) transmission.
  • the base station may allocate one or more physical uplink control channel (PUCCH) resources to each user equipment and receive them through the PUCCH which individually allocates ACK / NACK / DTX information bits for individual PDSCHs.
  • PUCCH physical uplink control channel
  • the UE randomly selects one bit for transmission of a single codeword (ie, one transport block) and two bits for transmission of two codewords (ie, two transport blocks) for transmission of ACK / NACK / DTX information bits.
  • Can be transmitted through PUCCH for example, 1-bit ACK / NACK is transmitted in PUCCH format 1a and 2-bit ACK / NACK is transmitted in PUCCH format 1b in LTE Rel-8), and more generally, N (> 2).
  • N bits of information bits may be transmitted using PUCCH in any format for transmission of four codewords (ie, N transport blocks).
  • the terminal transmits a plurality of PUCCH.
  • the maximum output is set to be low in consideration of the power-backoff (transmission power setting margin) when the terminal transmits due to an increase of uplink peak-to-average power ratio (PAPR) or cubic metric (CM). ) May occur.
  • PAPR uplink peak-to-average power ratio
  • CM cubic metric
  • a method of transmitting one or more ACK / NACK information bits through a series of ACK / NACK channel selection methods may be considered.
  • the ACK / NACK channel selection method may be differently represented by an ACK / NACK resource selection method or an ACK / NACK multiplexing method.
  • the base station when the UE transmits the PUCCH, the base station basically transmits the uplink reference signal transmitted to the same physical resource region with respect to the received PUCCH.
  • Channel compensation for the PUCCH may be performed based on uplink channel information (for example, channel estimation) in the corresponding physical resource region obtained through (Reference Signal).
  • uplink channel information for example, channel estimation
  • Reference Signal Reference Signal
  • the ACK / NACK resource selection method a plurality of transmission candidate physical resources of the PUCCH are reserved and the terminal selects one of the physical resources according to ACK / NACK / DTX (or ACK / NACK) state information. And the base station recognizes which PUCCH physical resource has been transmitted through a power or energy detection process on a reserved PUCCH transmission candidate physical resource in a received signal, and transmits the ACK / NACK / DTX ( Alternatively, all or part of the status information range of the ACK / NACK) status information may be determined.
  • the process of detecting power or energy for the PUCCH transmission candidate physical resource from the received signal may be defined as a series of non-coherent reception methods.
  • the ACK / NACK resource selection method is always based on transmitting the PUCCH, the information subspace (or feedback information subspace) and the PUCCH transmission transmitted through the ACK / NACK resource selection method are transmitted.
  • An information subspace (or feedback information subspace) provided from the channel itself is provided. Accordingly, the entire information space (or feedback information space) provided through the entire ACK / NACK resource selection method is configured as the two types of information subspaces (or feedback information subspaces).
  • FIG. 8 is a diagram illustrating an example of an information space mapping method provided when the ACK / NACK resource selection method of the present invention is applied.
  • the UE selects one of P PUCCH transmission candidate physical resources to transmit ACK / NACK / DTX (or ACK / NACK) status information as an information space.
  • the entire information space can be defined as the product of the information subspace P and the information subspace Q.
  • the base station receiving the UE transmission using the above scheme may detect the information subspace P by applying the non-coherent reception scheme described above in the PUCCH, and synchronize the detected PUCCH through the synchronization (
  • the information subspace Q can be detected by demodulation and decoding by applying a coherent) reception scheme. Accordingly, the base station receives the PUCCH transmitted to any specific candidate physical resource in the situation where the ACK / NACK channel selection scheme is applied, thereby receiving a series of ACK / NACK / DTX (or ACK / NACK) state information transmitted by the terminal. I can figure it out.
  • a PUCCH channel selection method for transmitting an ACK / NACK signal and a PUCCH format 1a / 1b designed in 3GPP LTE can be applied.
  • the basic concept of the PUCCH channel selection method and a method of information transmission may refer to FIG. 8. That is, the terminal may select a radio resource (ie, a PUCCH channel) according to feedback information to be transmitted to the base station among candidate radio resources occupied for PUCCH transmission.
  • the size of the information subspace Q is 2 when the PUCCH format 1a, and 4 is the PUCCH format 1b.
  • an ACK / NACK / DTX (or ACK / NACK) feedback information is mapped to an information space or an information subspace.
  • information of low reliability is mapped to information subspace P
  • information of highly reliable feedback information is mapped to information subspace P.
  • the information subspace P may be provided through the PUCCH channel selection method of the UE
  • the information subspace Q may be provided through the PUCCH channel transmission through the physical resource selected by the UE.
  • the information subspace P and the information subspace Q are used for feedback of the ACK / NACK / DTX (or ACK / NACK) status information, it may be referred to as a feedback information subspace as described above.
  • mapping ACK / NACK or ACK / NACK / DTX state information calculated according to the number of downlink component carriers (DL CCs) allocated to a terminal and the number of transmission codewords to a PUCCH will be described. That is, methods of mapping the feedback information space and the ACK / NACK state information or the ACK / NACK / DTX state information will be described.
  • a series of PDSCHs or PDSCHs may be transmitted and the situation of one or two codewords (ie, one or two transport blocks) applied by a transmission scheme in an individual CC.
  • codewords ie, one or two transport blocks
  • a series of PDSCHs or PDSCHs may be transmitted and the situation of one or two codewords (ie, one or two transport blocks) applied by a transmission scheme in an individual CC.
  • Table 2 shows one example of a method of mapping the ACK / NACK / DTX states described in Table 1 to the feedback information index.
  • the terminal configures the feedback information index as a binary bit string and transmits it to the base station.
  • the feedback information state index may be defined in the domain of the Galois field G (2) in view of information theory.
  • FIG. 9 is a diagram illustrating a conceptual example of a method for mapping an information space and a feedback information index defined by a specific transmission scheme of a terminal according to an embodiment of the present invention.
  • the size of the entire information space derived according to the transmission scheme of the terminal for the status information of the ACK / NACK / DTX (or ACK / NACK) is D + 1
  • any method according to the downlink transmission aspect Assume that the number of feedback information indices expressed and mapped to ACK / NACK / DTX (or ACK / NACK) states that are required or calculated as is C + 1.
  • the feedback information index to which one or more ACK / NACK / DTX (or ACK / NACK) states are mapped may be mapped to any element index of the information space. It can be understood that one or more ACK / NACK / DTX (or ACK / NACK) states map to any element index in the information space.
  • the value of D is greater than or equal to the value of C
  • individual feedback information indexes or individual ACK / NACK / DTX (or ACK / NACK) states are individually mapped to element indexes provided on the information space. have.
  • some multiple feedback information indexes or ACK / NACK / DTX (or ACK / NACK) states may be bundled and mapped as any one information space element index.
  • the terminal is ⁇ (ACK, ACK), (ACK, NACK), (NACK, ACK), (NACK, NACK) , (DTX) ⁇ can be used to calculate the feedback information states.
  • the UE selects a channel based on two PUCCH resources (eg, channel selection resource index: ⁇ i, j ⁇ ), and selects four points ⁇ c0, c1 on IQ constellation on PUCCH format 1b. , c2, c3 ⁇ can be used to calculate an information space (three-bit string as a binary index) of a total size of 8.
  • Table 3 below shows an example of an information space format of size 8 calculated through two PUCCH resources and four points on PUCCH format 1b.
  • FIG. 10 is a diagram illustrating a terminal transmission and a base station reception when a PUCCH is transmitted by applying an ACK / NACK channel selection method as one of ACK / NACK transmission methods for downlink data according to an embodiment of the present invention.
  • an e-Node B may transmit control information for transmitting downlink data to a user equipment (UE) through a PDCCH (S1010).
  • the UE may acquire information on the existence of the PDSCH and a transmission region in which the PDSCH is transmitted using the corresponding control information. Accordingly, the UE may decode the PDSCH at the time when the corresponding PDSCH is transmitted (S1020).
  • the terminal should inform the base station whether the PDSCH is normally received. That is, the terminal should inform the base station of feedback information (eg, ACK / NACK or ACK / NACK / DTX state) indicating the reception state of the PDSCH. Accordingly, the UE may select one of the reserved PUCCH transmission candidate physical resources in the information subspace P provided by the aforementioned ACK / NACK channel selection method (see FIG. 8) (S1030).
  • feedback information eg, ACK / NACK or ACK / NACK / DTX state
  • the UE may map the feedback information indexes described in Tables 2 and 3 to the selected PUCCH (see description of FIG. 9) (S1040).
  • the UE may transmit a PUCCH signal in which ACK / NACK state information is mapped to a feedback information index (S1050).
  • the base station may identify the subspace P and detect the PUCCH through a non-coherent reception method. In addition, the base station may obtain information on the area of the ACK / NACK / DTX (or ACK / NACK) status information or the status information mapped to the information subspace P (S1060).
  • the base station performs demodulation and decoding on the detected PUCCH through a coherent reception scheme, and performs an ACK / NACK / DTX (or ACK / NACK) state mapped to a symbol space, that is, an information subspace Q, in the PUCCH signal.
  • Indicative feedback information index may be obtained (S1070).
  • the base station may transmit a new PDSCH to the terminal in the case of ACK, and transmits a retransmission PDSCH processed according to the retransmission scheme in the case of NACK, and retransmits the previous PDSCH in case of a DTX error.
  • the UE proposes a detailed method of mapping ACK / NACK / DTX (or ACK / NACK) status information or feedback information index to an information subspace.
  • the UE may add reliability higher than the ACK-to-NACK error to the NACK-to-ACK error in the HARQ process and the entire processing. That is, the UE may select one PUCCH among P multiple PUCCH resource candidates by weighting NACK-to-ACK error when selecting a PUCCH channel.
  • the UE maps ACK / NACK / DTX (or ACK / NACK) states in which a large number of ACKs appear in the information subspace P, and an ACK in which many NACKs or DTXs appear in the information subspace Q provided by the selected PUCCH channel itself. It is possible to map mainly / NACK / DTX (or ACK / NACK) states.
  • the UE maps ACK / NACK / DTX (or ACK / NACK) states in which NACK or DTX appears to many in the information subspace P, and ACK / in which many ACKs appear in the information subspace Q provided by the selected PUCCH channel itself.
  • NACK / DTX (or ACK / NACK) states may be primarily mapped.
  • the cell and the base station for receiving the PUCCH signal is provided as a position detection on the PUCCH physical resources through a non-coherent reception method performed through power / energy detection Detects a terminal transmission ACK / NACK / DTX (or ACK / NACK) state information or a range of state information on the information subspace P and based on an information subspace Q mapped to a PUCCH signal detected through a coherent reception scheme. Terminal transmission ACK / NACK / DTX (or ACK / NACK) status information can be obtained.
  • the base station may acquire ACK / NACK / DTX (or ACK / NACK) status information or status information range in which a large number of ACKs are generated through a non-coherent reception detection scheme for the PUCCH signal, and the received PUCCH may be obtained.
  • ACK / NACK / DTX or ACK / NACK
  • state information in which a large number of NACKs or DTXs mapped to the PUCCH are displayed.
  • the UE may receive a PDSCH signal transmitted through L DL CCs.
  • the UE may define the importance, reliability or priority of each ACK / NACK / DTX (or ACK / NACK) state based on the occurrence probability of the ACK state and the NACK state of the PDSCH.
  • the UE may select one of the P candidate PUCCHs in consideration of the probability of occurrence of the ACK / NACK state. That is, the UE maps the ACK / NACK / DTX (or ACK / NACK) state or state range requiring low reliability to the information subspace P, and maps the ACK / NACK / DTX (or ACK / NACK required high reliability). ) Can be mapped to the information subspace Q separately.
  • the UE selects one of the P candidate PUCCH physical resources in the information subspace P, and ACK / NACK / DTX (or ACK / NACK) state information having high reliability in the ACK / NACK information bits of the PUCCH through the selected physical resource.
  • the PUCCH signal may be transmitted to the base station by mapping its feedback information index.
  • the cell and the base station may perform ACK / NACK / DTX (or mapped to subspace P) based on the position on the candidate physical resource of the PUCCH detected through a non-coherent reception method through the reception power or energy detection for the PUCCH signal.
  • the UE maps the ACK / NACK / DTX (or ACK / NACK) state information to the feedback information index or the element index of the information space provided by the ACK / NACK transmission scheme for the DTX state, Basically, in association with the NACK state, more weight may be given to the information subspace Q in which the NACK states are defined, or the DTX state may be mapped at a uniform ratio to the information subspaces P and Q.
  • Embodiment A a method of mapping ACK / NACK / DTX (or ACK / NACK) state information on an information subspace based on occurrence probabilities of ACK / NACK / DTX (or ACK / NACK) states is described. .
  • the occurrence probabilities of the ACK / NACK / DTX (or ACK / NACK) states may be calculated based on the decoding probabilities for any PDSCH and PDCCH.
  • a block error probability (BLER) for any PDSCH transmission may be basically set to 10%. Of course, you can aggressively set it to 20% or 30%.
  • the 10% BLER means that the UE has a 90% probability of receiving any PDSCH normally and a 10% probability that an error occurs.
  • the decoding error probability of the PDCCH is set to 1%, the probability of generating a DTX error may be calculated as 1%.
  • the terminal may map the ACK information on the information subspace Q detected by the base station through coherent decoding, or may map the states where a large number of ACKs are defined at a predetermined ratio or more. .
  • the UE may generate ACK / NACK / DTX (or ACK / NACK) state information having a high probability of generating element indexes of the information subspace Q provided through a coherent reception method through demodulation and decoding on the PUCCH.
  • ACK / NACK / DTX (or ACK) with low probability of occurrence in the information subspace P that maps its feedback information indices and is provided through a non-coherent reception method through power or energy detection on candidate PUCCH physical resources.
  • / NACK) state information or feedback information indexes thereof may be mapped and transmitted.
  • the number (P) of PUCCHs that the UE can use is limited, and the number (Q) of ACK / NACK information bits that can be transmitted through each PUCCH is also limited.
  • the size of the entire information space, defined as P * Q may be insufficient to represent all cases of overall ACK / NACK / DTX status information.
  • the terminal may change some of the very unlikely ACK / NACK / DTX (or ACK / NACK) states (for example, states that are less likely to occur or are less important to process) to the entire feedback information index mapping or information space.
  • ACK / NACK very unlikely ACK / NACK / DTX
  • the terminal may change some of the very unlikely ACK / NACK / DTX (or ACK / NACK) states (for example, states that are less likely to occur or are less important to process) to the entire feedback information index mapping or information space.
  • base states such as a series of "all NACK” or "all DTX" to compress at least two pieces of ACK / NACK / DTX (or ACK / NACK) state information into these base states It can be expressed as one feedback information index for a state or an element index of one information space.
  • the terminal is one or more states or one or more ACK / NACK / DTX (or ACK / ANCK) state that is most similar in terms of the presentation information and one or more basic states to be excluded (for example, the smallest distance in the information dimension By bundling) into one state, the size of the entire feedback information can be reduced. That is, the terminal may adjust the size of the entire feedback information within the size of the entire information space through this compression process.
  • the terminal may define only the ACK state and the NACK state to feed back to the base station.
  • the UE may select one PUCCH among P multiple PUCCH candidate physical resources by placing emphasis on NACK-to-ACK error when selecting a channel. For example, the UE maps ACK / NACK states in which many ACKs appear in the information subspace P, maps NACK association information to the information subspace Q provided as the ACK / NACK container bit included in the selected PUCCH, or frequently NACK.
  • the ACK / NACK state that occurs may be mainly mapped.
  • the cell and the base station receiving the PUCCH signal find the location of the physical resource (element index of the information subspace P) to which the PUCCH is transmitted through a non-coherent reception method performed through power / energy detection, and the detected PUCCH NACK information may be obtained through an information subspace Q mapped to a PUCCH signal detected through a coherent reception method through demodulation and decoding. That is, the base station can obtain a specific ACK / NACK state information or a range of state information through the asynchronous reception method of the PUCCH signal, and is mapped to the PUCCH by applying a coherent reception method through demodulation and decoding the received PUCCH ACK / NACK state information can be obtained.
  • the UE may receive a PDSCH signal transmitted through L DL CCs.
  • the UE may define the importance, reliability or priority of each ACK / NACK state based on the occurrence probability of the ACK state and the NACK state of the PDSCH.
  • the UE may select one of the P candidate PUCCHs in consideration of the probability of occurrence of the ACK / NACK state. That is, the terminal may map a low reliability ACK / NACK state to the information subspace P, and a high reliability ACK / NACK state to the information subspace Q.
  • the UE may select one of the P candidate PUCCHs in the information subspace P, map a highly reliable ACK / NACK state to the ACK / NACK information bits of the selected PUCCH, and transmit the PUCCH signal to the base station.
  • the cell and the base station obtain the ACK / NACK state information mapped to the subspace P through a non-coehrent reception method for the PUCCH signal transmitted by applying the ACK / NACK channel selection method from the terminal and coherent Through the reception method, ACK / NACK state information mapped to the subspace Q may be obtained.
  • the terminal may define an ACK state, a NACK state, and a DTX state to feed back to the base station.
  • the UE may add reliability higher than the ACK-to-NACK error to the NACK-to-ACK error in the HARQ process and the entire processing.
  • more reliability can be given to ACT-to-DTX errors with respect to DTX-to-ACK errors.
  • the UE may select one PUCCH physical resource among P multiple PUCCH candidate physical resources by giving weight to NACK-to-ACK error when selecting a channel. For example, the UE may map ACK / NACK states in which a large number of ACKs appear in the information subspace P, and select a PUCCH according to the ACK / NACK / DTX state in the information subspace P.
  • the UE maps ACK / NACK states indicated by many NACKs to information subspace Q, maps NACK association information to information subspace Q provided as ACK / NACK container bits included in the selected PUCCH, or ACK / NACK states can be mapped primarily.
  • the UE may basically give more weight to the information subspace Q in which the NACK states are defined in association with the NACK state, or may map the DTX state at a uniform ratio to the information subspaces P and Q.
  • the cell and the base station receiving the PUCCH signal detect the location of the PUCCH physical resource through a non-coherent reception method performed through power / energy detection, and thus ACK / NACK state information or state through the information subspace P.
  • the ACK / NACK state information can be obtained through the information subspace Q mapped to the PUCCH signal detected through the information range and detected through a coherent reception scheme. That is, the base station can acquire the state information or the state information range in which the ACK appears a lot by detecting the PUCCH signal through a non-coherent reception method, and perform coherent reception on the detected PUCCH to the PUCCH.
  • ACK / NACK state information in which much mapped NACK appears can be obtained.
  • the UE may receive a PDSCH signal transmitted through L DL CCs.
  • the UE may define the importance, reliability, or priority of each ACK / NACK / DTX state based on the occurrence probability of the ACK state, the NACK state, and the DTX state of the PDSCH.
  • the UE may select one of the P PUCCH candidate physical resources in consideration of the probability of occurrence of the ACK / NACK / DTX state. That is, the terminal may map the ACK / NACK / DTX state with low reliability to the information subspace P, and the ACK / NACK / DTX state with high reliability to the information subspace Q.
  • the UE may select one of the P candidate PUCCHs in the information subspace P, map a highly reliable ACK / NACK / DTX state to the container bits of the selected PUCCH, and transmit the PUCCH signal to the base station.
  • the cell and the base station acquire the ACK / NACK / DTX state information mapped to the subspace P through a non-coherent reception detection scheme for the PUCCH signal, and perform coherent demodulation and decoding to perform the subspace Q.
  • ACK / NACK / DTX state information mapped to may be obtained.
  • FIG. 11 is a block diagram of a transmitter and a receiver for OFDMA and SC-FDMA as an embodiment of the present invention.
  • the transmitters 1102-1114 are terminals and the receivers 1116-1130 are part of a base station.
  • a transmitter is part of a base station and a receiver is part of a terminal.
  • an OFDMA transmitter includes a serial to parallel converter 1102, a sub-carrier mapping module 1106, and an M-point Inverse Discrete Fourier Transform (IDFT) module. 1108, a cyclic prefix (CP) addition module 1110, a parallel to serial converter (1121), and a Radio Frequency (RF) / Digital to Analog Converter (DAC) module 1114. .
  • serial to parallel converter 1102 a sub-carrier mapping module 1106, and an M-point Inverse Discrete Fourier Transform (IDFT) module.
  • IFT Inverse Discrete Fourier Transform
  • 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 a data block received from a medium access control (MAC) layer.
  • MAC medium access control
  • the bit stream is sometimes referred to as a 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 Quadrature Amplitude Modulation (n-QAM).
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • n-QAM Quadrature Amplitude Modulation
  • serial data symbol sequences are converted N by N in parallel (1102).
  • 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 (1106).
  • Data symbols mapped to the frequency domain are converted into time domain sequences through M-point IDFT processing (1108).
  • M-point IDFT processing (1108).
  • an OFDMA symbol is generated by adding a CP to the time-domain sequence.
  • the generated OFDMA symbols are converted from parallel to serial (1112).
  • the OFDMA symbol is transmitted to the receiver through digital-to-analog conversion, frequency up-conversion, and the like (1114).
  • 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 1116, a serial / parallel converter 1118, a Remove CP module 1120, an M-point Discrete Fourier Transform (DFT) module 1122, Subcarrier demapping / equalization module 1124, parallel / serial converter 1128, and detection module 1130.
  • 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 1104 before the subcarrier mapping module 1106 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 1126 after the subcarrier demapping module 1124 as compared to the OFDMA receiver.
  • the signal processing of the SC-FDMA receiver consists of the inverse of the SC-FDMA transmitter.
  • Components of the transmitter and the receiver disclosed in FIG. 11 represent a configuration for transmitting and receiving uplink data and downlink data in the physical layer.
  • control information transmitted through the PDCCH, downlink data transmitted through the PDSCH, control information transmitted through the PUCCH eg, ACK / NACK information, ACK / NACK / DTX information
  • ACK / NACK information ACK / NACK / DTX information
  • FIG. 11 It may be processed and transmitted and received through the disclosed components.
  • FIG. 12 is a diagram illustrating a mobile station and a base station in which the embodiments of the present invention described with reference to FIGS. 2 to 11 may be performed.
  • the mobile terminal may operate as a transmitter in uplink and as a receiver in downlink.
  • the base station may operate as a receiver in the uplink, and may operate as a transmitter in the downlink.
  • the mobile terminal and the base station may include a transmission module (Tx module: 1240, 1250) and a receiving module (Rx module: 1250, 1270), respectively, to control transmission and reception of information, data, and / or messages.
  • Antennas 1200 and 1210 for transmitting and receiving information, data, and / or messages.
  • the mobile station and the base station each include a processor 1220 and 1230 for performing the above-described embodiments of the present invention, and memories 1280 and 1290 capable of temporarily or continuously storing the processing of the processor. can do.
  • the mobile terminal and the base station of FIG. 12 may further include a Radio Frequency (RF) / Intermediate Frequency (IF) module.
  • RF Radio Frequency
  • IF Intermediate Frequency
  • the processors 1220 and 1230 may further include a mapper for mapping the feedback information disclosed in the embodiments of the present invention.
  • the processor 1220 of the mobile terminal maps the ACK / NACK and / or DTX information to the information subspace P and the information subspace Q, respectively, as described in FIGS. 8 to 10 and the corresponding descriptions. can do.
  • the processor 1230 of the base station may control synchronous / non-coherent reception detection and coherent demodulation and decoding to detect ACK / NACK information and / or DTX information mapped to the PUCCH.
  • the transmission module and the reception module included in the mobile station and the base station include a packet modulation and demodulation function, a high speed packet channel coding function, an orthogonal frequency division multiple access (OFDMA) packet scheduling, and a time division duplex (TDD) for data transmission.
  • OFDMA orthogonal frequency division multiple access
  • TDD time division duplex
  • Division Duplex may perform packet scheduling and / or channel multiplexing.
  • the processor included in the mobile station and the base station is MAC (control function, handover function, authentication and encryption function, service characteristics and radio environment for performing the non-cooperative handover of the present invention described above) Medium Access Control) frame variable control, high-speed traffic real-time control and / or real-time modem control.
  • MAC control function, handover function, authentication and encryption function, service characteristics and radio environment for performing the non-cooperative handover of the present invention described above
  • Medium Access Control Medium Access Control
  • frame variable control high-speed traffic real-time control and / or real-time modem control.
  • FIG. 12 is a means in which the methods described in FIGS. 2 to 10 may be implemented. Embodiments of the present invention can be performed using the components and functions of the above-described mobile terminal and base station apparatus.
  • the mobile terminal is a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a GSM (Global System for Mobile) phone, a WCDMA (Wideband CDMA) phone, A mobile broadband band system (MBS) phone, a hand-held PC, a notebook PC, a smart phone, or a multi-mode multi-band (MM-MB) terminal may be used.
  • PDA personal digital assistant
  • PCS personal communication service
  • GSM Global System for Mobile
  • WCDMA Wideband CDMA
  • MBS mobile broadband band system
  • hand-held PC a notebook PC
  • smart phone or a multi-mode multi-band (MM-MB) terminal
  • MM-MB multi-mode multi-band
  • a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and may mean a terminal incorporating data communication functions such as schedule management, fax transmission and reception, which are functions of a personal mobile terminal, in a mobile communication terminal.
  • a multimode multiband terminal can be equipped with a multi-modem chip to operate in both portable Internet systems and other mobile communication systems (e.g., code division multiple access (CDMA) 2000 systems, wideband CDMA (WCDMA) systems, etc.). Speak the terminal.
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • Embodiments of the invention may be implemented through various means.
  • embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.
  • the method according to embodiments 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). Field programmable gate arrays (FPGAs), 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.
  • the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above.
  • software code may be stored in the memory units 1280 and 1290 and driven by the processors 1220 and 1230.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.
  • Embodiments of the present invention can be applied to various wireless access systems.
  • various radio access systems include 3rd Generation Partnership Project (3GPP), 3GPP2 and / or IEEE 802.xx (Institute of Electrical and Electronic Engineers 802) systems.
  • Embodiments of the present invention can be applied not only to the various radio access systems, but also to all technical fields to which the various radio access systems are applied.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne une variété de procédés et d'appareils servant à transmettre des signaux d'accusé de réception (par exemple, des signaux ACK/NACK) dans un système d'accès sans fil. Selon le premier mode de réalisation de la présente invention, un procédé servant à transmettre des informations ACK/NACK (accusé de réception/accusé de réception négatif) dans un système d'accès sans fil comprend les étapes consistant à : sélectionner un canal de commande de liaison montante physique (PUCCH) pour transmettre des informations ACK/NACK provenant d'un ou de plusieurs PUCCH mappés sur un premier sous-espace d'informations (par ex., le sous-espace d'informations P); mapper un second sous-espace d'informations (par ex., le sous-espace d'informations Q) sur un symbole de commande pour transmettre les informations ACK/NACK contenues dans le PUCCH sélectionné; et mapper les informations ACK/NACK sur le PUCCH sélectionné et transmettre les informations ACK/NACK à une station de base. Dans la présente, les informations ACK/NACK peuvent être mappées sur le premier sous-espace d'informations et sur le second sous-espace d'informations, respectivement, en fonction de la fiabilité des informations ACK/NACK.
PCT/KR2010/002512 2009-04-21 2010-04-21 Procédé et appareil servant à transmettre des informations ack/nack WO2010123286A2 (fr)

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US61/171,423 2009-04-21

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WO2021025390A1 (fr) * 2019-08-07 2021-02-11 삼성전자 주식회사 Appareil et procédé pour configurer des sous-créneaux et transmettre des informations de liaison montante dans un système de communication sans fil
US10993213B2 (en) * 2014-08-28 2021-04-27 Chengdu Td Tech Ltd. Method and apparatus for controlling secondary carriers in asymmetric uplink carrier aggregation

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US9686056B2 (en) 2012-05-11 2017-06-20 Blackberry Limited PHICH transmission in time division duplex systems
WO2013191519A1 (fr) * 2012-06-22 2013-12-27 엘지전자 주식회사 Procédé d'emission-reception d'un signal de commande et appareil correspondant

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WO2013055174A2 (fr) * 2011-10-13 2013-04-18 엘지전자 주식회사 Procédé et équipement utilisateur pour émettre un signal de liaison montante, et procédé et nœud b évolué pour recevoir un signal de liaison montante
WO2013055174A3 (fr) * 2011-10-13 2013-07-04 엘지전자 주식회사 Procédé et équipement utilisateur pour émettre un signal de liaison montante, et procédé et nœud b évolué pour recevoir un signal de liaison montante
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US10993213B2 (en) * 2014-08-28 2021-04-27 Chengdu Td Tech Ltd. Method and apparatus for controlling secondary carriers in asymmetric uplink carrier aggregation
WO2021025390A1 (fr) * 2019-08-07 2021-02-11 삼성전자 주식회사 Appareil et procédé pour configurer des sous-créneaux et transmettre des informations de liaison montante dans un système de communication sans fil

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WO2010123286A3 (fr) 2011-03-03
KR101241921B1 (ko) 2013-03-11
KR20110139275A (ko) 2011-12-28

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