WO2015050339A1 - Procédé d'émission et de réception d'un canal de commande en liaison descendante, et appareil associé - Google Patents

Procédé d'émission et de réception d'un canal de commande en liaison descendante, et appareil associé Download PDF

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Publication number
WO2015050339A1
WO2015050339A1 PCT/KR2014/008995 KR2014008995W WO2015050339A1 WO 2015050339 A1 WO2015050339 A1 WO 2015050339A1 KR 2014008995 W KR2014008995 W KR 2014008995W WO 2015050339 A1 WO2015050339 A1 WO 2015050339A1
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Prior art keywords
index
subframe
control channel
downlink
cce
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PCT/KR2014/008995
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English (en)
Korean (ko)
Inventor
박규진
최우진
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주식회사 케이티
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Priority claimed from KR1020140067128A external-priority patent/KR101919636B1/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to US15/026,260 priority Critical patent/US9998269B2/en
Priority to CN201480054504.XA priority patent/CN105659514B/zh
Publication of WO2015050339A1 publication Critical patent/WO2015050339A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • 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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation

Definitions

  • the present invention relates to a method and apparatus for transmitting and receiving a downlink control channel, and more particularly, to a method and apparatus for transmitting a downlink control channel for a machine type communication (MTC) terminal.
  • MTC machine type communication
  • Machine Type Communication or Machine to Machine (M2M) is communication between devices and things with no or minimal human intervention.
  • machine may refer to an entity that does not require direct human intervention or intervention, and “MTC” may refer to a form of data communication that includes one or more such “machines.”
  • An example of a “machine” may be a smart meter or vending machine equipped with a mobile communication module, and recently, a smartphone that automatically connects to a network and performs communication without user intervention or intervention depending on the location or situation of the user. With the advent of the portable terminal having the MTC function is also considered as a form of "machine”.
  • the MTC terminal may be installed in a place where the radio environment is worse than that of the general terminal. Therefore, the coverage of the MTC terminal should be improved to 20dB or more compared to the coverage of the general terminal.
  • An object of the present invention is to provide a method and apparatus for transmitting and receiving a downlink control channel for an MTC terminal to overcome the above problems.
  • a search space setting method for monitoring a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH) of an MTC terminal is proposed.
  • determining a start subframe of a plurality of downlink subframes in which the downlink control channel is repeatedly transmitted Physical Channel Downlink Control CHannel (PDCCH) or Enhanced Physical Downlink Control CHannel (EPDCCH) candidate that is repeatedly transmitted through a frame, or Control Channel Element (CCE) index (es) or Enhanced CCE (ECCE) Index (ECCE)
  • CCE Control Channel Element
  • ECCE Enhanced CCE Index
  • a method for receiving a downlink control channel by a terminal includes identifying a start subframe of a plurality of downlink subframes in which the downlink control channel is repeatedly transmitted, and the plurality of downlink subframes.
  • CCE Control Channel Element
  • ECCE Enhanced CCE index
  • a base station transmitting a downlink control channel determines the start subframe of a plurality of downlink subframes in which the downlink control channel is repeatedly transmitted, and the plurality of downlink subframes Physical Downlink Control CHannel (PDCCH) or Enhanced Physical Downlink Control CHannel (EPDCCH) candidates that are repeatedly transmitted through a control channel element (CCE) index or indices or enhanced CCE (ECCE) index (s)
  • PDCCH Physical Downlink Control CHannel
  • EPDCCH Enhanced Physical Downlink Control CHannel
  • CCE control channel element index or indices or enhanced CCE (ECCE) index
  • a terminal receiving a downlink control channel identifies a start subframe of a plurality of downlink subframes in which the downlink control channel is repeatedly transmitted, and in the plurality of downlink subframes.
  • FIG. 1 shows an example of a wireless communication system to which an embodiment of the present invention is applied.
  • FIG. 2 is a diagram illustrating blind decoding of PDCCH / EPDCCH and obtaining PDSCH scheduling information.
  • 4 is a diagram showing the number of EREGs by ECCE.
  • 5 is a diagram for Supported EPDCCH formats.
  • FIG. 6 is a diagram illustrating an example of a method of blind decoding a PDCCH or an EPDCCH and receiving a PDSCH by an MTC terminal.
  • FIG. 7 is a diagram illustrating an example of a subframe in which PDCCH / EPDCCH is repeatedly transmitted.
  • FIG. 8 is a diagram illustrating a process of determining, by a base station, a start subframe of repetitive transmission of scheme 1 according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a process of a base station determining and signaling a start subframe of repetitive transmission according to another embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a process of determining, by a base station, CCE / ECCE index (es) of Method 2 according to an embodiment of the present invention.
  • FIG. 11 illustrates a process of a base station determining and signaling a CCE / ECCE index (es) of Method 2 according to another embodiment of the present invention.
  • FIG. 12 is a view showing an operation of a base station according to an embodiment of the present invention.
  • FIG. 13 is a view illustrating an operation process of a terminal according to an embodiment of the present invention.
  • FIG. 14 is a diagram illustrating a configuration of a base station according to another embodiment.
  • 15 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement.
  • the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement.
  • the MTC terminal may mean a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
  • the MTC terminal may mean a newly defined Release 13 low cost (or low complexity) UE category / type for performing LTE-based MTC related operations.
  • the MTC terminal supports enhanced coverage compared to the existing LTE coverage, or UE category / type defined in the existing Release 12 or less that supports low power consumption, or newly defined Release 13 low cost (or low complexity). It may mean a UE category / type.
  • FIG. 1 shows an example of a wireless communication system to which an embodiment of the present invention is applied.
  • the wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data, and the like.
  • the wireless communication system includes a user equipment (UE) and a base station (base station, BS, or eNB).
  • a user terminal is a generic concept meaning a terminal in wireless communication.
  • user equipment (UE) in WCDMA, LTE, and HSPA, as well as mobile station (MS) in GSM, user terminal (UT), and SS It should be interpreted as a concept that includes a subscriber station, a wireless device, and the like.
  • a base station 20 or a cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B, an Sector, and a Site. It may be called by other terms such as a base transceiver system (BTS), an access point, an access node, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.
  • BTS base transceiver system
  • RRH remote radio head
  • RU radio unit
  • the base station 20 or the cell is a partial area covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE / LTE-Advanced, and the like. Or, it should be interpreted as a comprehensive meaning of function, and encompasses various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range. to be.
  • BSC base station controller
  • the base station may be interpreted in two senses. i) the device providing the megacell, the macrocell, the microcell, the picocell, the femtocell, the small cell in relation to the wireless area, or ii) the wireless area itself. In i) all devices which provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless area to direct the base station.
  • the base station may indicate the radio area itself to receive or transmit a signal from a viewpoint of a user terminal or a neighboring base station.
  • megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmit / receive points, transmit points, and receive points are collectively referred to as base stations. do.
  • the user terminal and the base station are two transmitting and receiving entities used to implement the technology or technical idea described in this specification in a comprehensive sense and are not limited by the terms or words specifically referred to.
  • the user terminal and the base station are two types of uplink or downlink transmitting / receiving subjects used to implement the technology or the technical idea described in the present invention, and are used in a generic sense and are not limited by the terms or words specifically referred to.
  • the uplink (Uplink, UL, or uplink) refers to a method for transmitting and receiving data to the base station by the user terminal
  • the downlink (Downlink, DL, or downlink) means to transmit and receive data to the user terminal by the base station It means the way.
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • One embodiment of the present invention can be applied to resource allocation in the fields of asynchronous wireless communication evolving to LTE and LTE-Advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB.
  • the present invention should not be construed as being limited or limited to a specific wireless communication field, but should be construed as including all technical fields to which the spirit of the present invention can be applied.
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • a standard is configured by configuring uplink and downlink based on one carrier or a pair of carriers.
  • the uplink and the downlink include a Physical Downlink Control CHannel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control CHannel (EPDCCH), and the like.
  • Control information is transmitted through the same control channel, and data is configured by a data channel such as a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).
  • PDSCH physical downlink shared channel
  • PUSCH physical uplink shared channel
  • control information may also be transmitted using an enhanced PDCCH (EPDCCH or extended PDCCH).
  • EPDCCH enhanced PDCCH
  • extended PDCCH extended PDCCH
  • a cell means a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.
  • a wireless communication system to which embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-antenna transmission scheme in which two or more transmission / reception points cooperate to transmit a signal.
  • antenna transmission system a cooperative multi-cell communication system.
  • the CoMP system may include at least two multiple transmission / reception points and terminals.
  • the multiple transmit / receive point is at least one having a base station or a macro cell (hereinafter referred to as an eNB) and a high transmission power or a low transmission power in a macro cell region, which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • an eNB a base station or a macro cell
  • a high transmission power or a low transmission power in a macro cell region which is wired controlled by an optical cable or an optical fiber to the eNB. May be RRH.
  • downlink refers to a communication or communication path from a multiple transmission / reception point to a terminal
  • uplink means a communication or communication path from a terminal to multiple transmission / reception points.
  • a transmitter may be part of multiple transmission / reception points, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal, and a receiver may be part of multiple transmission / reception points.
  • a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH may be expressed in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, an EPDCCH, and a PDSCH.
  • transmitting (sending) or receiving a PDCCH or transmitting (sending) or receiving a signal through the PDCCH includes transmitting (sending) or receiving an EPDCCH or transmitting (sending) or receiving a signal through the EPDCCH. Can be used in the sense.
  • the physical downlink control channel described below may mean PDCCH or EPDCCH, and may also be used to include both PDCCH and EPDCCH.
  • the EPDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH, and the PDCCH may be applied to the portion described as the EPDCCH as an embodiment of the present invention.
  • high layer signaling described below includes RRC signaling for transmitting RRC information including an RRC parameter.
  • the base station or eNB 20 performs downlink transmission to the terminals 10.
  • the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling required to receive the PDSCH.
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
  • PUSCH physical uplink shared channel
  • the base station 20 transmits downlink control information (DCI) to the terminal 10 through a PDCCH / EPDCCH.
  • the DCI may include a downlink scheduling assignment including PDSCH resource information or an uplink scheduling grant including PUSCH resource information.
  • the base station 20 uses DCI to allocate uplink / downlink data transmission resources to the terminal 10 and transmits the same to the terminal 10 using a downlink control channel.
  • the downlink control channel may be classified into a PDCCH and an EPDCCH according to a location of a transmission resource used for transmitting a DCI.
  • the PDCCH is transmitted in a control region established through a control format indicator (CFI).
  • CFI control format indicator
  • the control region is formed over the entire downlink bandwidth and consists of 1 to 4 OFDM symbols for each subframe according to the CFI setting value.
  • the EPDCCH is transmitted using the remaining transmission resources except for the control region in each subframe.
  • the transmission resource used for EPDCCH transmission is allocated to a subframe predefined by upper layer signaling (for example, RRC (Radio Resource Control)) and a plurality of predefined physical resource block (PRB) pairs for each UE. Can only be used.
  • RRC Radio Resource Control
  • PRB physical resource block
  • a basic transmission resource unit may be referred to as a control channel element (CCE).
  • CCE control channel element
  • One CCE may consist of nine Resource Element Groups (REGs), and one REG may consist of four Resource Elements (REs).
  • the basic transmission resource unit may be referred to as ECCE (Enhanced CCE).
  • ECCE Enhanced CCE
  • One ECCE is composed of 4 or 8 EREGs (Enhanced REGs) according to cyclic prefix length and / or TDD configuration, and one EREG is variable depending on RE used for RS (Reference Signal) transmission. It may be composed of a plurality of RE.
  • the base station 20 may set the number of CCEs used to transmit one DCI through the PDCCH according to the channel condition of the terminal. This is called an aggregation level, and 1, 2, 4, or 8 CCEs may be used according to the channel condition of the UE.
  • the base station 20 may set the number of ECCEs used when transmitting one DCI through the EPDCCH according to the channel condition of the terminal. This is called an aggregation level, and 1, 2, 4, 8, 16, or 32 ECCEs may be used according to the channel condition of the UE.
  • the PDCCH / EPDCCH is composed of a plurality of CCE / ECCE
  • the base station can transmit a plurality of DCI to a plurality of terminals in every subframe.
  • the UE does not separately provide CCE / ECCE allocation information (that is, CCE combining level information and CCE transmission resource location information used for one DCI transmission) necessary for the UE to receive DCI through PDCCH / EPDCCH. Therefore, the terminal performs blind decoding on the possible coupling level and the CCE / ECCE transmission resource to confirm the DCI transmitted to the terminal.
  • the PDCCH configured with pre-defined CCE / ECCE indices for each UE.
  • Blind decoding is performed only on a candidate / EPDCCH candidate.
  • the CCE index / ECCE index constituting the PDCCH candidate / EPDCCH candidate for each coupling level may be defined as a function of a coupling level, a value of a Radio Network Temporary Identifier (RNTI), and a slot number (or subframe number).
  • the UE may perform blind decoding only on a limited number of PDCCH candidates / EPDCCH candidates at each coupling level in every subframe.
  • FIG. 2 illustrates a method of blind decoding a PDCCH / EPDCCH by a general terminal and receiving a PDSCH.
  • the UE attempts blind decoding of the PDCCH / EPDCCH with respect to the PDCCH candidate / EPDCCH candidate.
  • a cyclic redundancy check (CRC) is added to the DCI, and the UE checks the CRC to confirm the DCI transmitted to the DCI.
  • CRC cyclic redundancy check
  • the UE acquires downlink scheduling information included in the DCI and decodes the PDSCH using downlink data transmission resources in the same subframe as the subframe in which the DCI is transmitted. do.
  • PUSCH scheduling information may also be obtained by blind decoding PDCCH / EPDCCH.
  • a PDCCH defined in a Rel-10 or lower system and an EPDCCH newly defined in a Rel-11 system are used as a downlink control information (DCI) transmission channel for a UE. .
  • DCI downlink control information
  • FIG. 3 illustrates four PDCCH formats.
  • four PDCCH formats as shown in FIG. 3 are transmitted for link adaptation according to downlink radio channel quality and DCI size of the UE.
  • the number of CCEs represents an aggregation level.
  • FIG. 4 is a diagram showing the number of EREGs by ECCE.
  • the value of (Number of EREGs per ECCE) is determined according to the characteristics of the subframe, and in the case of the normal cyclic prefix, it is a normal subframe or a special subframe of 3, 4, and 8 settings. Special subframe, configuration 3, 4, 8) is 4.
  • a normal subframe or a special subframe of 1, 2, 3, 5, and 6 configuration (Special subframe, configuration 1, 2, 3, 5, 6) ) Is 8.
  • FIG. 5 is a diagram for Supported EPDCCH formats. In FIG. 5, it is divided into case A and case B, and is divided into five types according to localized transmission and distributed transmission, respectively.
  • EPDCCH five EPDCCH formats are transmitted according to FIGS. 4 and 5 for link adaptation for DCI transmission.
  • the coverage of the LTE MTC terminal is conventional LTE terminal. It should be improved by about 20dB compared to the coverage of. In addition, if the performance reduction due to the specification change is further considered, the coverage of the LTE MTC terminal should be improved by 20 dB or more.
  • the data transmission rate must satisfy the data transmission rate provided by the minimum EGPRS-based MTC terminal, that is, downlink 118.4kbps, uplink 59.2kbps.
  • Frequency efficiency should be improved significantly compared to GSM / EGPRS MTC terminal.
  • the service area provided shall not be smaller than that provided by the GSM / EGPRS MTC terminal.
  • Power consumption should not be greater than GSM / EGPRS MTC terminal.
  • Low cost LTE MTC terminal should support limited mobility and low power consumption module.
  • PDCCH / EPDCCH for transmission of scheduling control information or other downlink control information for any one terminal or terminal group is transmitted through one downlink subframe.
  • PDCCH or EPDCCH transmission which was performed in one downlink subframe unit, is repeatedly transmitted through a plurality of downlink subframes and corresponding MTC.
  • the UE also needs to perform decoding by combining PDCCHs or EPDCCHs received through the plurality of downlink subframes.
  • PDCCH / EPDCCH format for performing PDCCH / EPDCCH decoding in the corresponding MTC terminal.
  • FIG. 6 is a diagram illustrating an example of a method of blind decoding a PDCCH or an EPDCCH and receiving a PDSCH by an MTC terminal.
  • the base station repeatedly transmits one DCI through four subframes of SF # 0 (Subframe Number # 0) to SF # 3 in consideration of a channel condition of the UE.
  • the base station repeatedly transmits the same data through four subframes of SF # 3 to SF # 6 in consideration of the channel condition of the terminal.
  • the CRC check succeeds as a result of blind decoding by soft combining the received values of the DCIs transmitted from SF # 0 to SF # 3
  • the UE checks scheduling information of the PDSCH included in the DCI.
  • the terminal performs decoding by soft combining the received values of the data transmitted in SF # 3 to SF # 6.
  • N repeated PDCCH / EPDCCH candidates, corresponding PDCCH / EPDCCH candidates in each of the N DL subframe (s) in a method of determining DL subframe (s) for the configuration of m, m A method and apparatus for setting up a search space constituting the allocated CCE / ECCE index (es) (indexes or indices) are described.
  • Means CIF Carrier Indicator Field
  • Equation 2 the value is determined by Equation 2 below.
  • the corresponding PDCCH is not transmitted through a single downlink subframe, but N downlink subframes are defined according to the number of PDCCH repetitions or the definition of a new PDCCH format for the MTC terminal. Since it can be repeatedly transmitted through, it is necessary to extend the corresponding search space to the downlink subframe domain.
  • a method of determining a search space constituting an N repeated PDCCH candidate, m, in which the number of repetitions is defined as N In Method 1, a DL subframe index constituting a corresponding N repeated PDCCH candidate ( (Index or indices), and in scheme 2, a search space configuration expression defining a CCE index (es) (index or indices) constituting a corresponding N repeated PDCCH candidate and m in each N DL subframes. Can be defined.
  • Method 1 and Method 2 described below may be equally applied. In this case, PDCCH may be changed to EPDCCH, and CCE may be changed to ECCE.
  • FIG. 7 is a diagram illustrating an example of a subframe in which PDCCH / EPDCCH is repeatedly transmitted.
  • n is determined, and PDCCH / EPDCCH is N consecutive downlink subframes from the downlink subframe SF # k start, n , that is, SF # k start, n to SF # (k start, n + N-1 May be repeated N times.
  • Scheme 1 starting DL subframe of PDCCH / EPDCCH repetition for MTC UEs
  • the downlink subframe k start, n at which the start of the corresponding PDCCH repetition is performed may be determined by the number N of the corresponding PDCCH repetitions. May be determined as a value satisfying Equation 3 below.
  • M represents a System Frame Number (SFN) value. Indicates the slot number.
  • the mod value of Equation 3 may be defined to have any natural value smaller than N, not 0.
  • the coupling level and L may also define the corresponding DL subframe (s) as a parameter of the determination equation.
  • Equations 3 and 4 above are merely an embodiment for determining DL subframe (s) in which the corresponding PDCCH repetition is performed as a function of the number of repetitions, a function of N or the number of repetitions N and L, but is not limited thereto.
  • Other forms of determining the DL subframe (s) as a function of or as a function of N and L may be included within the scope of the present invention.
  • N repeated PDCCH candidates As another method of determining N repeated PDCCH candidates, DL subframe index at which the corresponding PDCCH transmission to define DL subframe (s) constituting m, and k start, n are repeated.
  • the corresponding start subframe index value may be set directly and transmitted to each MTC terminal through cell specific or UE-specific higher layer signaling.
  • a starting DL subframe index for monitoring the corresponding N repeated PDCCH candidates and m for a DL subframe of a period may be set and signaled in a bitmap manner.
  • the N repeated PDCCH candidates and N DL subframe index (s) constituting m are cell-specific at the base station.
  • each MTC terminal may be configured directly.
  • the corresponding N DL subframe (s) may be allocated discontinuously, and for this purpose, N DL subframe (s) having a constant period P may be defined.
  • the N DL subframe (s) is a bitmap scheme for all DL subframes in the corresponding period P (the number of DL subframes may be P in the case of FDD and may be smaller than P in the case of TDD). It may be allocated as, but there is no restriction on a specific signaling scheme for allocating corresponding N DL subframe (s).
  • Equation 1 may be applied as a first method of determining a search space constituting a corresponding N-repeatable PDCCH candidate, m in each DL subframe (s). That is, accordingly, N repeated PDCCH candidates for any MTC terminal, a search space set in each DL subframe (s) for m, ⁇ ⁇ May be determined as in Equation 5 below.
  • Equation 6 above is only one embodiment of the search space determination formula including the number of repetitions and N as a parameter, but the form of the search space setting formula including the N is not limited thereto. That is, in defining the corresponding search space setting expression, another type of search space setting expression using the corresponding N value as a parameter may be included in the scope of the present invention.
  • DL subframe #k start which is a DL subframe in which the N repeated PDCCH transmission is started as another method for determining a corresponding N repeated PDCCH candidate in each DL subframe (s), m.
  • the CCE index (es) defined in , n may be used to define the CCE index (s) allocated in a subsequent downlink subframe. That is, when N PDCCH repetitions are performed in N consecutive downlink subframes from downlink subframe k start, n to downlink subframe k start, n + N ⁇ 1 for DCI transmission for an arbitrary MTC terminal.
  • the index (es) may be defined to use the same CCE index (s) as the CCE index (es) used for transmission of the corresponding PDCCH in k start, n , which is the first downlink subframe.
  • the CCE index (es) constituting the corresponding N repeated PDCCH candidates, m, in DL subframes # (k start, n +1) to DL subframes # (k start, n + N-1) are determined accordingly.
  • the UE performs CCE index (es) constituting PDCCH candidate (s) for each repetition level. It can be set semi-static via specific or cell specific RRC signaling. In this case, each coupling level, L and repetition levels, CCE starting offset values for each N , and CCE L, N may be signaled.
  • the first N repeating PDCCH candidates in the first DL subframe #k start, n to Dl subframe # (k start, n + N-1) are configured by CCE L, N to CCE L, N + L-1, respectively.
  • the second CCE is composed of CCE L, N + L ⁇ CCE L, N + 2L-1, and the C-th N repeated PDCCH candidate is CCE L, N + (C-1) L ⁇ CCE. L, N + CL-1.
  • N value may be applied regardless of any value, and the DL subframe index setting method for the N repeated PDCCH candidates and m and the CCE configuration method in each DL subframe.
  • the combination is not limited and may be included in the scope of the present invention even when the proposed methods are applied to each other independently.
  • FIG. 8 is a diagram illustrating a process of determining, by a base station, a start subframe of repetitive transmission of scheme 1 according to an embodiment of the present invention.
  • the base station 20 and the terminal 10 may be configured to perform a repetition number N, an aggregation level L, and a slot number n s . Use one or more of them. That is, the start subframe of the repeated transmission may be checked by a function using at least one of N, L, and n s as parameters (S810). Thereafter, the base station 20 repeatedly transmits the PDCCH / EPDCCH to the terminal 10 in the checked start subframe, and the terminal 10 receives it (S820).
  • FIG. 9 is a diagram illustrating a process of a base station determining and signaling a start subframe of repetitive transmission according to another embodiment of the present invention.
  • FIG. 9 illustrates, in another embodiment of the first method, that the base station 20 sets a repetitive start subframe (S910), and transmits information on the start subframe to the UE using higher layer signaling (S920).
  • the terminal 10 can identify which subframe is a subframe in which repetitive transmission is started, and then the base station 20 repeatedly transmits PDCCH / EPDCCH to the terminal 10 in the identified starting subframe. The terminal 10 receives this (S930).
  • FIG. 10 is a diagram illustrating a process of determining, by a base station, CCE / ECCE index (es) of Method 2 according to an embodiment of the present invention.
  • the base station 20 may calculate the search space of the PDCCH / EPDCCH to be repeatedly transmitted by using a repetition number N and an aggregation level as shown in Equation 5 or Equation 6. That is, the base station 20 and the terminal 10 determine the PDCCH / EPDCCH search space of the start subframe of the repeated transmission as a function of the number of repetitions (N) and / or the combined level (L) in a predetermined manner ( In step S1010, the base station 20 repeatedly transmits the PDCCH / EPDCCH to the terminal 10 in the checked start subframe, and the terminal 10 receives the received signal (S1020).
  • FIG. 11 illustrates a process of a base station determining and signaling a CCE / ECCE index (es) of Method 2 according to another embodiment of the present invention.
  • the base station 20 sets CCEs / ECCEs of subframes to be repeatedly transmitted (S1110), and transmits information on these CCEs / ECCEs to the terminal 10 through higher layer signaling (S1120).
  • the base station 20 since the terminal 10 secures information on the CCE / ECCE to be monitored, the base station 20 repeatedly transmits the PDCCH / EPDCCH to the terminal 10 in the checked start subframe, and the terminal ( 10) receives it (S1130).
  • An embodiment of the present invention may be configured by selecting and combining the method 1 of FIGS. 8 and 9 and the method 2 of FIGS. 10 and 11, respectively.
  • FIG. 12 is a view showing an operation of a base station according to an embodiment of the present invention.
  • the base station shows a process of transmitting a downlink control channel to the terminal.
  • the base station determines the start subframe of the plurality of downlink subframes in which the downlink control channel is repeatedly transmitted (S1210).
  • the base station determines a search space composed of CCE index (es) or ECCE index (es) constituting a PDCCH or EPDCCH candidate repeatedly transmitted through the plurality of downlink subframes (S1220).
  • the base station repeatedly transmits the downlink control channel through the plurality of downlink subframes based on the determined starting subframe and the CCE index (es) or ECCE index (s) (S1230).
  • the step S1210 may include calculating using any one or more of the repetition number N, the aggregation level L, and the slot number n s . do. This may be preceded by the process of determining the equation or the application method in advance with respect to the terminal using the equation (3) or (4).
  • the step S1210 further includes setting a subframe index of the start subframe to the terminal through higher layer signaling.
  • the step S1220 includes each downlink subframe or slot index where the repeated transmission is performed, the total number of CCEs or ECCEs configured in each downlink subframe, RNTI of the UE, and repeated transmission. It can be calculated using the number N and / or the coupling level L. This may be preceded by the process of determining the equation or the application method in advance with respect to the terminal using the equation (5) or (6).
  • the step S1220 is a higher layer of information on CCE index (es) or ECCE index (s) allocated to a search space for PDCCH or EPDCCH candidates in the plurality of downlink subframes.
  • the terminal may be configured through high layer signaling.
  • Higher layer signaling may be one of cell specific higher layer signaling or terminal specific higher layer signaling as described above.
  • FIG. 13 is a view illustrating an operation process of a terminal according to an embodiment of the present invention.
  • a terminal shows a process of receiving a downlink control channel from a base station.
  • the terminal checks the start subframe of the plurality of downlink subframes in which the downlink control channel is repeatedly transmitted (S1310).
  • the UE identifies CCE index (es) or ECCE index (s) allocated to a search space for PDCCH or EPDCCH candidates in the plurality of downlink subframes. Confirmation of the S1310 and S1320 may be performed at the same time or at a time interval.
  • the UE repeatedly monitors the downlink control channel by performing monitoring through the plurality of downlink subframes based on the identified starting subframe and the CCE index (es) or ECCE index (s) (S1330). ).
  • the confirmation method of S1310 may be performed by the terminal using one or more of the repetition number N, the aggregation level L, and the slot number n s .
  • the index of the starting subframe may be calculated. This may be preceded by a process of determining an equation or an application scheme with the base station in advance with respect to the use of Equations 3 or 4.
  • the checking method of S1310 further includes receiving a subframe index of the starting subframe from the base station through higher layer signaling.
  • the UE may determine each downlink subframe or slot index in which the repetitive transmission is performed and the total CCE or ECCE configured in each downlink subframe. It can be calculated using the number, the RNTI of the terminal, the number of repetitive transmissions N and / or the coupling level L. This may be preceded by the process of determining the equation or the application method in advance with the base station for using the equation (5) or (6). In case of applying the method 2 of FIG.
  • the UE performs CCE index (es) or ECCE index (s) allocated to a search space for PDCCH or EPDCCH candidates in the plurality of downlink subframes. ) Can be received from the base station through high layer signaling.
  • Higher layer signaling may be one of cell specific higher layer signaling or terminal specific higher layer signaling as described above.
  • FIG. 14 is a diagram illustrating a configuration of a base station according to another embodiment.
  • the base station 1400 includes a controller 1410, a transmitter 1420, and a receiver 1430.
  • the control unit 1410 is a downlink control channel transmission method for a machine type communication (MTC) terminal in a 3GPP LTE / LTE-A system required to carry out the above-described present invention. To control the overall operation of the base station.
  • MTC machine type communication
  • the transmitter 1420 and the receiver 1430 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
  • the base station 1400 transmits a downlink control channel, and for this purpose, the controller 1410 determines a start subframe of a plurality of downlink subframes in which the downlink control channel is repeatedly transmitted and A search space consisting of CCE index (es) or ECCE index (s) constituting a PDCCH or EPDCCH candidate repeatedly transmitted through a downlink subframe is determined.
  • the transmitter 1420 repeatedly transmits the downlink control channel through the plurality of downlink subframes based on the determined start subframe and the CCE index (es) or ECCE index (es).
  • the controller 1410 starts using the at least one of the repetition number N, the aggregation level L, and the slot number n s .
  • the subframe may be determined. This may be preceded by the process of determining the equation or the application method in advance with respect to the terminal using the equation (3) or (4).
  • the controller 1410 may control the transmitter 1420 to set the subframe index of the start subframe to the terminal through higher layer signaling.
  • the controller 1410 may include each downlink subframe or slot index for which the repetitive transmission is performed, the total number of CCEs or ECCEs configured in each downlink subframe, RNTI of the UE,
  • the CCE index (es) or ECCE index (s) may be determined using the number of repetitive transmissions N and / or the coupling level L. This may be preceded by the process of determining the equation or the application method in advance with respect to the terminal using the equation (5) or (6).
  • the controller 1410 may provide information on CCE index (es) or ECCE index (s) allocated to a search space for PDCCH or EPDCCH candidates in the plurality of downlink subframes.
  • the transmitter 1420 may be controlled to be set to the terminal through higher layer signaling.
  • 15 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • a user terminal 1500 includes a receiver 1530, a controller 1510, and a transmitter 1520.
  • the receiver 1530 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • control unit 1510 sets up a search space for PDCCH monitoring of an MTC terminal in a downlink control channel transmission method for a machine type communication (MTC) terminal in a 3GPP LTE / LTE-A system required to perform the above-described present invention. Control the overall operation of the terminal according to.
  • MTC machine type communication
  • the transmitter 1520 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the terminal 1500 receives a downlink control channel, and the controller 1510 identifies a start subframe of a plurality of downlink subframes in which the downlink control channel is repeatedly transmitted, and the plurality of downlink control channels.
  • the CCE index (es) or ECCE index (s) allocated to the search space for PDCCH or EPDCCH candidates are identified.
  • the controller 1510 starts using the at least one of the repetition number N, the aggregation level L, and the slot number n s . You can check the subframe. This may be preceded by a process of determining an equation or an application scheme with the base station in advance with respect to the use of Equations 3 or 4.
  • the controller 1510 may control the receiver 1530 such that the receiver 1530 receives the subframe index of the start subframe from the base station through higher layer signaling.
  • the control unit 1510 may include each downlink subframe or slot index for which the repetitive transmission is performed, the total number of CCEs or ECCEs configured in each downlink subframe, RNTI of the UE,
  • the CCE index (es) or ECCE index (s) may be calculated using the number of repetitive transmissions N and / or the coupling level L. This may be preceded by the process of determining the equation or the application method in advance with the base station for using the equation (5) or (6).
  • the controller 1510 allocates a search space for PDCCH or EPDCCH candidates in the plurality of downlink subframes to identify the CCE index (es) or ECCE index (es).
  • the receiver 1530 may control the CCE index (es) or ECCE index (es) to be received from the base station through higher layer signaling.

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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 un procédé d'émission et de réception d'un canal de commande en liaison descendante, et un appareil à cet effet. Le procédé par lequel une station de base émet un canal de commande en liaison descendante, selon un mode de réalisation de la présente invention, comporte les étapes consistant à: déterminer une sous-trame de début d'une pluralité de sous-trames de liaison descendante par l'intermédiaire desquelles un canal de commande en liaison descendante est émis de façon répétée; déterminer un espace de recherche comportant un ou plusieurs index d'élément de canal de commande (CCE), ou un ou plusieurs index de CCE améliorés (ECCE), constituant un canal physique de commande en liaison descendante (PDCCH) candidat ou un canal physique amélioré de commande en liaison descendante (EPDCCH) candidat qui sont émis de façon répétée par l'intermédiaire de la pluralité de sous-trames de liaison descendante; et à émettre de façon répétée le canal de commande en liaison descendante par l'intermédiaire de la pluralité de sous-trames de liaison descendante, en se basant sur la sous-trame de début déterminée et sur le ou les index de CCE ou d'ECCE.
PCT/KR2014/008995 2013-10-04 2014-09-26 Procédé d'émission et de réception d'un canal de commande en liaison descendante, et appareil associé WO2015050339A1 (fr)

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CN201480054504.XA CN105659514B (zh) 2013-10-04 2014-09-26 用于传输和接收下行链路控制信道的方法及其设备

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US11212832B2 (en) 2015-01-29 2021-12-28 Telefonaktiebolaget Lm Ericsson (Publ) PDCCH initialization suitable for MTC devices
US20160360551A1 (en) * 2015-01-29 2016-12-08 Telefonaktiebolaget Lm Ericsson (Publ) PDCCH Initialization Suitable for MTC Devices
CN107690762B (zh) * 2015-04-29 2021-02-26 Lg 电子株式会社 用于接收下行链路控制信道的方法和lc设备
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CN107690762A (zh) * 2015-04-29 2018-02-13 Lg 电子株式会社 用于接收下行链路控制信道的方法和lc设备
US11882064B2 (en) 2015-07-31 2024-01-23 Qualcomm Incorporated Multiplexing downlink control information of same aggregation level by coding together
US11095404B2 (en) 2015-07-31 2021-08-17 Qualcomm Incorporated Multiplexing downlink control information of same aggregation level by coding together
TWI719993B (zh) * 2015-07-31 2021-03-01 美商高通公司 藉由一起編碼來多工同一聚合等級的下行鏈路控制資訊
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CN106559161B (zh) * 2015-09-24 2019-01-04 株式会社Kt 传输和接收下行控制信息的方法及其装置
CN106559161A (zh) * 2015-09-24 2017-04-05 株式会社Kt 传输和接收下行控制信息的方法及其装置
CN106911999A (zh) * 2015-12-23 2017-06-30 中兴通讯股份有限公司 窄带系统中搜索空间的确定方法及装置
US11330574B2 (en) 2016-02-05 2022-05-10 Nec Corporation Communication system
CN106793100A (zh) * 2016-05-09 2017-05-31 展讯通信（上海）有限公司 用户设备、网络侧设备及用户设备的控制方法
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US11601868B2 (en) 2016-05-09 2023-03-07 Spreadtrum Communications (Shanghai) Co., Ltd. User equipment, method for controlling the same and network side device
CN110741594A (zh) * 2017-06-13 2020-01-31 Lg电子株式会社 接收下行链路控制信道的方法和用于该方法的设备
CN113632564A (zh) * 2020-03-06 2021-11-09 北京小米移动软件有限公司 下行控制信道传输方法、装置、终端及接入网设备
CN113924756A (zh) * 2020-05-08 2022-01-11 北京小米移动软件有限公司 物理下行控制信道传输方法、装置及存储介质
CN113924756B (zh) * 2020-05-08 2024-04-30 北京小米移动软件有限公司 物理下行控制信道传输方法、装置及存储介质

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