WO2016117885A1 - Procédé pour transmettre des informations de commande de liaison descendante et dispositif correspondant - Google Patents

Procédé pour transmettre des informations de commande de liaison descendante et dispositif correspondant Download PDF

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Publication number
WO2016117885A1
WO2016117885A1 PCT/KR2016/000494 KR2016000494W WO2016117885A1 WO 2016117885 A1 WO2016117885 A1 WO 2016117885A1 KR 2016000494 W KR2016000494 W KR 2016000494W WO 2016117885 A1 WO2016117885 A1 WO 2016117885A1
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Prior art keywords
search space
control information
common search
common
terminal
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PCT/KR2016/000494
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English (en)
Korean (ko)
Inventor
박규진
최우진
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주식회사 케이티
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Priority claimed from KR1020150135899A external-priority patent/KR20160089844A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority to US15/544,363 priority Critical patent/US10306546B2/en
Priority to CN201680004482.5A priority patent/CN107113149B/zh
Publication of WO2016117885A1 publication Critical patent/WO2016117885A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes

Definitions

  • the present invention relates to a method and apparatus for transmitting and receiving downlink control information. More specifically, a common search space for a terminal supporting a low complexity UE category / type or coverage enhancement operation for machine type communication (MTC) operation , CSS) setting method and apparatus.
  • MTC machine type communication
  • Machine type communication (hereinafter referred to as "MTC" communication) is a form of data communication, in which one or more entities represent machine or machine communication that does not necessarily require human interaction. . MTC communication that does not require human interaction refers to all communication methods in which communication is performed without human intervention in the communication process.
  • the MTC terminal may be installed in a place where the radio environment is worse than that of the general terminal.
  • it may be necessary to repeatedly transmit control information and / or data of each physical channel transmitted in one subframe unit in a plurality of subframes.
  • the degree of coverage extension required may vary according to a radio channel environment, and the number of repetitive transmissions or transmission power may be set differently according to a plurality of coverage extension levels in one cell.
  • the present invention proposes a method and apparatus for classifying and transmitting common control information according to a coverage extension level in an arbitrary cell in case of an MTC terminal supporting coverage extension.
  • the present invention is to propose a method and apparatus for setting a separate common search space according to the type of common control information for the common control information for the MTC terminal.
  • the present invention provides a method for receiving control information by an MTC terminal, the method comprising: monitoring a common search space set for each type of common control information and through a common search space; It provides a method comprising the step of receiving the transmitted common control information.
  • the present invention also provides a method for transmitting control information by a base station, comprising: setting a common search space for transmitting common control information of an MTC terminal and transmitting common control information through the common search space;
  • the search space provides a method characterized in that the search space is set for each type of common control information.
  • the present invention is a MTC terminal for receiving control information, a control unit for monitoring a common search space (Common Search Space) set for each type of common control information and a receiving unit for receiving the common control information transmitted through the common search space It provides a terminal device including a.
  • a control unit for monitoring a common search space (Common Search Space) set for each type of common control information
  • a receiving unit for receiving the common control information transmitted through the common search space It provides a terminal device including a.
  • the present invention includes a control unit for setting a common search space for transmitting common control information of the MTC terminal in the base station for transmitting the control information and a transmitter for transmitting common control information through the common search space, common search space Provides a base station apparatus characterized by being set for each type of common control information.
  • the present invention described above has an effect of providing a method and apparatus for classifying and transmitting common control information according to a coverage extension level in an arbitrary cell in case of an MTC terminal supporting coverage extension.
  • the present invention has the effect of providing a method and apparatus for setting a separate common search space for the common control information for the MTC terminal according to the type of common control information.
  • 1 is a diagram for explaining a PDCCH and an EPDCCH for transmitting downlink control information.
  • FIG. 2 is a signal diagram illustrating a signal flow of a terminal and a base station according to an embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating a terminal operation according to another embodiment of the present invention.
  • FIG. 4 is a flowchart illustrating an operation of a base station according to another embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating a terminal configuration according to another embodiment of the present invention.
  • FIG. 6 is a block diagram illustrating a configuration of a base station according to another embodiment of the present invention.
  • 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 defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
  • the MTC terminal may mean a newly defined 3GPP 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 supports UE category / type defined in the existing 3GPP Release-12 or lower, or newly defined Release-13 low cost (or lower power consumption).
  • low complexity can mean UE category / type.
  • 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 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, a Site, and a BTS.
  • Other terms such as a base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell may be called.
  • RRH remote radio head
  • RU radio unit
  • a base station or a cell is a generic meaning indicating some areas or functions covered by a base station controller (BSC) in CDMA, a Node-B in WCDMA, an eNB or a sector (site) in LTE, and the like. It should be interpreted as, and it is meant to cover all the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range.
  • 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
  • UMB Universal Mobile Broadband
  • 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 refers to 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 or receiving a PDCCH or transmitting or receiving a signal through a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.
  • 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 EPDCCH 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 eNB performs downlink transmission to the terminals.
  • 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
  • 1 is a diagram for explaining a PDCCH and an EPDCCH for transmitting downlink control information.
  • PDCCH and EPDCCH are defined as physical control channels for transmitting downlink control information (DCI) for a UE in a 3GPP LTE / LTE-Advanced system.
  • DCI downlink control information
  • the terminal may include UE-specific downlink control information scrambling with a Cell-Radio Network Temporary Identifier (C-RNTI) of the corresponding UE, a System Information-Radio Network Temporary Identifier (SI-RNTI), Cell-specific downlink control information scrambled with P-RNTI (Paging-Radio Network Temporary Identifier) and RA-RNTI (Random Access-Radio Network Temporary Identifier) could be received.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • SI-RNTI System Information-Radio Network Temporary Identifier
  • P-RNTI Paging-Radio Network Temporary Identifier
  • RA-RNTI Random Access-Radio Network Temporary Identifier
  • the UE includes scheduling information on a SIB (System Information Block) transmission resource transmitted by being CRC scrambled to SI-RNTI through CSS configured from CCE # 0 to CCE # 15 of the PDCCH.
  • DCI including scheduling information for a paging message transmitted by CRC scrambled to DCI and P-RNTI and DCI including scheduling information for random access response (RAR) message transmitted by CRC scrambled to RA-RNTI Perform monitoring for.
  • monitoring for DCI format 0 / 1A scrambled with C-RNTI of a corresponding UE including scheduling information for PDSCH / PUSCH for UE fallback operation is also performed.
  • each UE performs monitoring for UE-specific DCI scrambled with C-RNTI of the UE including scheduling information for PDSCH / PUSCH through USS defined through PDCCH or EPDCCH.
  • the conventional terminal monitors CSS to receive common control information, and monitors USS to receive terminal specific control information.
  • the present invention proposes a method and apparatus for classifying and setting CSS according to each common control information type.
  • the coverage of the LTE MTC terminal is compared with that of the conventional general LTE terminal. It should be improved by about 15 dB.
  • the coverage of the LTE MTC terminal should be improved by more than 15dB.
  • various methods such as PSD boosting, low coding rate, and time domain repetition transmission in order to improve coverage while lowering LTE MTC terminal price are performed for each physical channel. Is being considered.
  • the low complexity UE category / type requirements for MTC operation are:
  • Bandwidth reduced UEs should be able to operate within any system bandwidth.
  • the UE only needs to support 1.4 MHz RF bandwidth in downlink and uplink.
  • Reduced physical data channel processing e.g. relaxed downlink HARQ time line or reduced number of HARQ processes.
  • the existing LTE terminal is referred to as a normal LTE terminal
  • a new low complexity UE category / type satisfying a condition for MTC operation is referred to as an MTC terminal.
  • a normal LTE terminal or an MTC terminal supporting a coverage enhancement function or mode is referred to as an MTC terminal or a coverage enhanced (CE) terminal as necessary.
  • 'narrowband' consisting of six consecutive PRBs is defined as a unit for defining a transmission / reception band of an arbitrary MTC terminal in any uplink / downlink subframe and allocating the same, and according to each system bandwidth.
  • Downlink narrowbands and Uplink narrowbands are configured. here, Is the number of downlink resource blocks, Denotes the number of uplink resource blocks.
  • the remaining RB (s) is equal to both of the system bands for the remaining RB (s) corresponding to the remainder obtained by dividing the total number of PRBs constituting the system bandwidth by six. It is located at the center of the band edge, or the center of the system band, or the center of both edges and the system band, it is possible to configure a narrowband by tying up six consecutive PRBs by increasing PRB numbers using the PRBs other than this.
  • M-PDCCH downlink control channel
  • PDCCH and EPDCCH have been defined as a downlink control channel for transmitting and receiving DCI in a system of 3GPP LTE / LTE-Advanced Rel 12 or lower.
  • the UE receives a downlink control channel through a PDCCH transmitted through the first 1 to 3 OFDM symbols (2 to 4 OFDM symbols when the system bandwidth is 1.4 MHz) of all downlink subframes. did.
  • a new downlink control channel EPDCCH is defined in 3GPP LTE / LTE-Advanced Rel 11, and any terminal receives downlink control information through a PDCCH or downlink control information through an EPDCCH according to a base station configuration. It is now possible to receive.
  • downlink control information reception is performed by a blind detection method by monitoring a plurality of PDCCH candidates or EPDCCH candidates of a terminal.
  • any LTE / LTE-Advanced UE monitors a common search space (CSS) and a UE-specific search space (USS) consisting of a plurality of PDCCH candidates through a PDCCH region, or a plurality of UEs through an EPDCCH region. It was defined to monitor a USS consisting of EPDCCH candidates.
  • SCS common search space
  • USS UE-specific search space
  • each PDCCH candidate (candidate) or EPDCCH candidate (candidate) may be configured as a set of Control Channel Element (CCE) or Enhanced Control Channel Element (ECCE) which is a basic transmission unit of the PDCCH and EPDCCH, respectively.
  • CCE Control Channel Element
  • ECCE Enhanced Control Channel Element
  • any UE can search for PDCCH candidates or EPDCCH candidates having a plurality of different aggregation levels. Spaces (CSS and USS) have been defined.
  • M-PDCCH which is a downlink control channel for MTC terminal newly defined in Rel 13
  • a plurality of downlinks for coverage extension Repetition is needed through the link subframe.
  • a random M-PDCCH candidate is a set level L defined by the number of CCEs (or M-CCEs) used for transmission of the corresponding M-PDCCH in a single downlink subframe, respectively, and downlink is performed repeatedly It may be defined as a set of repetition times R defined by the number of link subframes. That is, any M-PDCCH candidate may be defined as ⁇ L, R ⁇ , and each MTC terminal has a plurality of M-PDCCH candidates having different L and R according to coverage level. Monitoring can be performed.
  • the PDSCH for any MTC terminal may be repeatedly transmitted through a plurality of downlink subframes for coverage extension.
  • the base station performs UE-specific RRC signaling on a set of PDSCH repetition level for designating the number of repetitive transmissions of the PDSCH according to the coverage level to which the UE belongs for each MTC UE. signaling, and a repetition level value to be applied to the corresponding PDSCH through the DCI including the PDSCH assignment information.
  • the repetition level value to be applied to the PDSCH may be determined according to the PDSCH repetition level to be applied among the repetition level sets.
  • a downlink subframe for DL transmission capable of transmitting and receiving a downlink radio channel or a downlink radio signal for an MTC terminal such as an M-PDCCH and a PDSCH may also be cell-specific through MTC-SIB1. specific) and broadcast to MTC terminals in the cell. That is, the aforementioned M-PDCCH candidates or PDSCH transmission may be performed only through a DL valid subframe configured through the corresponding MTC-SIB1.
  • a degree of coverage enhancement required may vary according to a radio channel environment.
  • a coverage level required according to a wireless channel environment for each CE terminal may be defined.
  • a separate repetition technique or power boosting may be applied for each coverage level.
  • a terminal belonging to one cell Even in this case, it may be efficient to separately transmit a paging message, RAR, SIB, etc. according to the coverage level to which the UE belongs.
  • a separate CSS is defined for MTC terminals belonging to each coverage level in an arbitrary cell supporting a coverage extension mode (or function), and based on this, scheduling information about a corresponding paging message, RAR message, and SIB transmission. It is necessary to send it.
  • a CSS setting method and apparatus for MTC terminal (or CE terminal) will be proposed.
  • the coverage level of each MTC terminal or CE terminal is determined according to the degree of coverage enhancement performance required for convenience of description, and the coverage to which the corresponding MTC terminal or CE terminal belongs.
  • a transmission method of an uplink / downlink radio channel for a corresponding terminal may be determined according to a coverage level.
  • the number of times or the degree of power boosting may be determined.
  • N is any natural number
  • MTC or CE UEs belonging to the corresponding cell are distributed within coverage level 0 to coverage level N-1.
  • the N value is assumed for the purpose of description and the factors for determining the N value or the coverage level are not limited.
  • FIG. 2 is a signal diagram illustrating a signal flow of a terminal and a base station according to an embodiment of the present invention.
  • the MTC terminal of the present invention checks the downlink control information by monitoring a common search space set for each type of common control information and receiving common control information transmitted through the common search space. Can be.
  • the base station includes the step of setting a common search space for transmitting the common control information of the MTC terminal and transmitting the common control information through the common search space, the common search space is set by the type of the common control information described above Downlink control information for one MTC terminal may be transmitted.
  • the base station 209 may set a common search space by dividing by common control information (S200).
  • S200 common control information
  • the base station 209 according to the type of the common control information, the common search space (CSS) that should be monitored by the terminal 200 for the transmission of the common control information in order to transmit the common control information for the MTC terminal can be set separately.
  • the base station 209 may include a common search space for transmitting common control information including scheduling information for a paging message and a common search space for transmitting common control information including scheduling information for a random access response message. It can be configured separately.
  • the base station 209 may be configured to configure a cell-specific common search space for paging.
  • the base station 209 may set the common search space for the random access response according to the PRACH repetition transmission level. That is, the common search space for the random access response may be classified and set according to the repetition level of the MTC terminal.
  • the terminal 200 monitors the common search space divided by the common control information by the base station 209 (S210). As described above, the terminal 200 monitors the first common search space in order to receive common control information including scheduling information for the paging message, and provides common control information including scheduling information for the random access response message. Monitor the second common search space to receive. That is, the terminal 200 monitors in each common search space that is divided and set for each common control information.
  • the base station 209 transmits common control information using a common search space set for each common control information (S220). For example, the base station 209 checks the type of common control information and transmits the common control information to the terminal 200 through a common search space corresponding to the common control information.
  • the terminal 200 may receive common control information including scheduling information about a paging or random access response for the corresponding terminal 200 by using the aforementioned various RNTIs (S230). Each common control information is received through a corresponding common search space, and the terminal 200 may receive a paging message or a random access response message using scheduling information of the common control information.
  • the common control information may be repeatedly received through one or more subframes, and the number of repetitions may be determined according to the coverage level or the repetition level of the MTC terminal.
  • FIG. 3 is a flowchart illustrating a terminal operation according to another embodiment of the present invention.
  • the MTC terminal includes monitoring a common search space set for each type of common control information and common control transmitted through the common search space. Receiving information.
  • the MTC terminal includes monitoring a common search space set for each type of common control information (S300). For example, the MTC terminal monitors a common search space in order to receive common control information for the MTC terminal.
  • the common search space may be separately set according to common control information, and may be differently set according to various types of common control information such as paging, random access, and system information.
  • the common search space may be set separately for each of scheduling information for paging and scheduling information for a random access response.
  • the common search space may be set separately for each coverage level or repetition level.
  • the common search space may be set cell specific or coverage level specific.
  • the common search space may be separately set according to the type of common control information and the repetitive transmission level.
  • the common search space configured for the random access response may be set for each physical random access channel (PRACH) repetitive transmission level. That is, the common search space configured for the random access response may be set separately from the common search space for paging, and may be separately set according to the PRACH repetition transmission level. For paging, a common search space set separately from a random access response or the like may be set cell-specific. As described above, the common search space may be separately set according to the type of common control information, and may be further divided and set according to the repetitive transmission level according to each common control information.
  • PRACH physical random access channel
  • the MTC terminal includes the step of receiving common control information transmitted through the common search space (S302).
  • the MTC terminal may receive common control information through the aforementioned common search space. That is, the MTC terminal may receive specific common control information through a specific common search space.
  • the MTC terminal receives common control information including scheduling information about a paging message through a common search space configured for paging, and schedules information about a random access response message in a common search space configured for a random access response. It can receive common control information that includes.
  • the MTC terminal includes common control information including scheduling information on a random access response message of the corresponding MTC terminal in a common search space configured for a random access response set according to the coverage level or the repeated transmission level of the corresponding MTC terminal. Can be received.
  • FIG. 4 is a flowchart illustrating an operation of a base station according to another embodiment of the present invention.
  • a base station In a method for transmitting control information, a base station according to another embodiment of the present invention comprises the steps of setting a common search space for transmitting common control information of an MTC terminal and transmitting common control information through the common search space. Including, the common search space may be set for each type of common control information.
  • the base station may include setting a common search space for transmitting common control information of the MTC terminal (S400).
  • the common search space may be set for each type of common control information.
  • the common search space may be separately set according to common control information, and may be differently set and set according to various types of common control information such as paging, random access, and system information.
  • the common search space may be set separately for each of scheduling information for paging and scheduling information for a random access response.
  • the common search space may be set separately for each coverage level or repetition level.
  • the common search space may be set cell specific or coverage level specific.
  • the common search space may be separately set according to the type of common control information and the repetitive transmission level.
  • the common search space configured for the random access response may be set for each physical random access channel (PRACH) repetitive transmission level. That is, the common search space configured for the random access response may be set separately from the common search space for paging, and may be separately set according to the PRACH repetition transmission level. For paging, a common search space set separately from a random access response or the like may be set cell-specific. As described above, the common search space may be separately set according to the type of common control information, and may be further divided and set according to the repetitive transmission level according to each common control information.
  • PRACH physical random access channel
  • the base station may include transmitting common control information through the common search space (S402).
  • the base station may transmit common control information through the aforementioned common search space.
  • the base station transmits common control information including scheduling information about a paging message through a common search space configured for paging, and includes scheduling information about a random access response message in a common search space configured for a random access response.
  • Common control information may be transmitted.
  • the base station transmits common control information including scheduling information on the random access response message of the MTC terminal in the common search space set for the random access response set according to the coverage level or the repetitive transmission level of the corresponding MTC terminal. Can be.
  • the common search space for the MTC terminal may be divided and set according to the type of common control information. If necessary, the common search space may be divided and set according to the coverage level or the repetitive transmission level of the corresponding MTC terminal. Alternatively, the common search space may be set cell specific or may be set to coverage level or repetitive transmission level.
  • the reception bandwidth is limited to 1.4 MHz, it is impossible to receive the PDCCH transmitted over the entire system bandwidth. Therefore, it is necessary to transmit a downlink control channel for the corresponding MTC terminal in 6 PRBs (Physical Resource Blocks) of the PDSCH region.
  • the EPDCCH defined in Rel 11 may be used, or a separate radio control channel for the MTC terminal may be newly defined in the PDSCH region.
  • the radio control channel and the radio data channel transmission for an arbitrary MTC terminal for CE (Coverage Enhancement) is not made in one subframe unit, but may be repeatedly transmitted through a plurality of subframes.
  • Embodiment 1 A separate CSS is set according to the type of common control information.
  • separate CSS may be defined according to the type of common control information (eg, DCI) monitored by the MTC terminal or the type of RNTI. That is, paging_CSS for monitoring M-PDCCH for transmitting scheduling information for paging and RA_CSS for monitoring M-PDCCH for transmitting scheduling information for RAR may be separately defined.
  • fallback_CSS may be defined for a fallback operation for the USS configured for each MTC terminal. Each MTC terminal may only monitor the M-PDCCH scrambled with P-RNTI in the configured paging_CSS, and may monitor only the M-PDCCH scrambled with RA-RNTI in the RA_CSS. In addition, the fallback_CSS may only perform monitoring of the M-PDCCH scrambled with the C-RNTI of the corresponding UE.
  • DCI common control information
  • the fallback_CSS may not be additionally defined and a fallback operation may be set through paging_CSS. That is, only paging_CSS and RA_CSS are separately set, and the MTC terminal performs monitoring only for the M-PDCCH scrambled with RA-RNTI in RA_CSS, but in the paging_CSS, not only the M-PDCCH scrambled with P-RNTI, but also the C- Monitoring of the M-PDCCH scrambled by the RNTI may also be performed.
  • RA_CSS may be defined to replace the operation of fallback_CSS, or both paging_CSS and RA_CSS may be defined to replace the operation of fallback_CSS. That is, if RA_CSS is defined to replace the fallback_CSS behavior, only p-_STI performs monitoring for M-PDCCH scrambled with P-RNTI, and RA-CSS in M-PDCCH scrambled with RA-RNTI and C-RNTI. Monitoring can be performed.
  • both paging_CSS and RA_CSS are defined to override the behavior of fallback_CSS, monitoring for M-PDCCH scrambled with P-RNTI and C-RNTI also through paging_CSS and scrambled with C-RNTI with RA-RNTI also through RA_CSS It may be defined to perform monitoring on the M-PDCCH.
  • Embodiment 2 A separate CSS is set according to the type and coverage level of common control information.
  • paging_CSS may be set to cell common.
  • each MTC terminal may perform monitoring on paging_CSS corresponding to its paging opportunity among paging_CSSs set to the corresponding cell common based on each paging occasion.
  • the RAR_CSS may be specifically set to a coverage level or a repetitive transmission level based on the coverage level or the repetitive transmission level of the PRACH corresponding to the corresponding RAR_CSS.
  • the cell common may be set regardless of the coverage level or the repeat transmission level to which the corresponding MTC terminal belongs, or the coverage level or the repeat transmission level of the corresponding MTC terminal may be specified.
  • Example 3 A method of setting CSS for each coverage level.
  • each MTC terminal or CE terminal may monitor only the MTC_CSS of the coverage level to which the corresponding MTC terminal or CE terminal belongs in order to receive common control information or terminal specific control information transmitted through CSS.
  • a time / frequency domain radio resource of CSS for each coverage level is explicitly set by the base station and explicitly signaled to MTC terminals in the cell through a separate MTC SIB defined for the MTC terminal.
  • the time / frequency domain radio resource allocation may be made implicit.
  • the radio resource allocation of the corresponding time / frequency domain may be performed as a function that takes at least one of a function of a physical cell ID (PCID), a SFN, a subframe (or slot) index, and a coverage level of a corresponding cell. .
  • MTC SIB only some information related to MTC_CSS configuration for each coverage level is explicitly signaled through MTC SIB in a hybrid manner, and the signaled information and at least one of the aforementioned PCID, SFN, subframe (or slot) index, and coverage level It can be determined as a function taking one as a parameter.
  • time domain radio resource allocation information e.g., duration of one MTC_CSS for each coverage level or period related information for configuring MTC_CSS
  • a corresponding MTC_CSS configuration cycle is performed.
  • the radio resource of the frequency domain in which the corresponding MTC_CSS is configured within the corresponding duration of may be determined as a function having at least one of the above-described PCID, SFN, subframe (or slot) index, and coverage level as a parameter.
  • the above-described method of setting CSS for each coverage level has been described, the same may be applied to the case where CSS is set for each repetitive transmission level as well as the coverage level. That is, the repetitive transmission level in the present specification may be determined corresponding to the coverage level, and the coverage level and the repetitive transmission level may be described in the same meaning as necessary.
  • Example 4 A method of classifying CSS according to two types.
  • two types of CSS that is, a coverage specific MTC_CSS and a cell common MTC_CSS
  • the MTC terminal or the CE terminal may monitor the two types of MTC CSS.
  • the cell common MTC_CSS may be configured to always monitor all MTC terminals or CE terminals regardless of the coverage level to which the MTC terminal or CE terminal belongs.
  • coverage specific MTC_CSS as in the third embodiment, each MTC terminal or CE terminal is separately defined for each coverage level, and each MTC terminal or CE terminal may monitor only the coverage specific MTC_CSS for the coverage level to which the corresponding terminal belongs.
  • every MTC terminal or CE terminal may monitor two types of MTC_CSS, which are coverage-specific MTC_CSS determined according to the coverage level to which the terminal belongs, and cell common MTC_CSS, which is commonly set in the cell regardless of the coverage level.
  • an RNTI type that the UE should monitor may be defined differently for receiving common control information (eg, DCI) for each MTC_CSS type.
  • the MTC terminal or the CE terminal monitors the common control information scrambled with the RA-RNTI and the P-RNTI through the coverage-specific MTC_CSS, and monitors the SI-RNTI and the terminal-specific C-RNTI through the cell common MTC_CSS.
  • the CRC scrambled common control information can be monitored.
  • the monitoring specific MTC_CSS is performed to monitor common control information including scheduling information about the RAR message or the paging message, and scheduling information about the MTC SIB or the UE specific PDSCH data channel is performed through the cell common MTC_CSS. It may be defined to perform monitoring on the common control information that includes. Or, it is defined to perform monitoring for RA-RNTI, P-RNTI, SI-RNTI through coverage-specific MTC_CSS, and to monitor common control information scrambled with SI-RNTI and C-RNTI through cell common MTC_CSS. May be The above-described method of defining the CSS type based monitoring RNTI is just an embodiment. As described above, the cell common MTC_CSS and the coverage specific MTC_CSS are defined, and the RNTI type monitored by each MTC_CSS may be variously set.
  • time / frequency resource allocation information for cell common CSS is explicitly signaled through PBCH or MTC SIB, or PCID, SFN,
  • some resource allocation information such as duration or period is implicitly signaled through PBCH and SIB in an implicitly determined or hybrid manner
  • the frequency domain resource allocation information is It can be set implicitly as a function that takes a PCID, SFN, subframe index, etc. as a parameter.
  • coverage level CSS configuration information may also be defined in an explicit, implicit or hybrid manner.
  • the UE may be defined to preferentially monitor the cell common MTC_CSS or, conversely, to monitor the coverage specific MTC_CSS.
  • the division of the cell common CSS described above and the CSS set for each coverage level may be defined based on a repetition level of M-PDCCH candidates configured through the corresponding CSS. For example, when CSS is configured to always include the maximum M-PDCCH repetition level supported through the cell (or when M-PDCCH candidates are configured including the corresponding maximum M-PDCCH repetition level).
  • the CSS may be classified as a cell common CSS, and when the repetition level of M-PDCCH candidates configured according to the coverage level is configured differently, the CSS may be classified as CSS set for each coverage level.
  • the present invention described above has an effect of providing a method and apparatus for classifying and transmitting common control information according to a coverage extension level in an arbitrary cell in case of an MTC terminal supporting coverage extension.
  • the present invention has the effect of providing a method and apparatus for setting a separate common search space for the common control information for the MTC terminal according to the type of common control information.
  • FIGS. 5 and 6 A configuration of a terminal and a base station capable of performing all the above-described embodiments of the present invention will be described with reference to FIGS. 5 and 6.
  • FIG. 5 is a block diagram illustrating a terminal configuration according to another embodiment of the present invention.
  • the MTC terminal 500 according to another embodiment of the present invention through the control unit 510 and the common search space for monitoring the common search space (Common Search Space) is set for each type of common control information It includes a receiving unit 530 for receiving the transmitted common control information.
  • Common Search Space Common Search Space
  • controller 510 monitors the CSS set according to each embodiment of the CSS setting method for the MTC terminal or the CE terminal required to carry out the above-described present invention. Control the operation of 500).
  • the common search space may be separately set according to common control information, and may be differently set according to various types of common control information such as paging, random access, and system information.
  • the common search space may be set separately for each of scheduling information for paging and scheduling information for a random access response.
  • the common search space may be set separately for each coverage level or repetition level.
  • the common search space may be set cell specific or coverage level specific.
  • the common search space may be separately set according to the type of common control information and the repetitive transmission level.
  • the common search space configured for the random access response may be set for each physical random access channel (PRACH) repetitive transmission level.
  • PRACH physical random access channel
  • the common search space configured for the random access response may be set separately from the common search space for paging, and may be separately set according to the PRACH repetition transmission level.
  • a common search space set separately from a random access response or the like may be set cell-specific.
  • the common search space may be separately set according to the type of common control information, and may be further divided and set according to the repetitive transmission level according to each common control information.
  • the receiver 530 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the transmitter 520 transmits uplink control information, data, and messages to the base station through the corresponding channel.
  • FIG. 6 is a block diagram illustrating a configuration of a base station according to another embodiment of the present invention.
  • the base station 600 transmits common control information through a control unit 610 and a common search space for setting a common search space for transmitting common control information of an MTC terminal.
  • the common search space may be set for each type of common control information.
  • control unit 610 is to set the CSS according to each embodiment of the CSS setting method for the MTC terminal or CE terminal required to perform the present invention, and to transmit the downlink control information through the CSS The overall operation of the base station 600 is controlled.
  • the common search space may be separately set according to common control information, and may be differently set according to various types of common control information such as paging, random access, and system information.
  • the common search space may be set separately for each of scheduling information for paging and scheduling information for a random access response.
  • the common search space may be set separately for each coverage level or repetition level.
  • the common search space may be set cell specific or coverage level specific.
  • the common search space may be separately set according to the type of common control information and the repetitive transmission level.
  • the common search space configured for the random access response may be set for each physical random access channel (PRACH) repetitive transmission level.
  • PRACH physical random access channel
  • the common search space configured for the random access response may be set separately from the common search space for paging, and may be separately set according to the PRACH repetition transmission level.
  • a common search space set separately from a random access response or the like may be set cell-specific.
  • the common search space may be separately set according to the type of common control information, and may be further divided and set according to the repetitive transmission level according to each common control information.
  • the transmitter 620 and the receiver 630 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention.

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

Abstract

La présente invention concerne un procédé d'émission/réception d'informations de commande de liaison descendante et un dispositif correspondant. Plus spécifiquement, la présente invention concerne un procédé et un dispositif permettant de configurer un espace de recherche commun (CSS) pour un équipement utilisateur prenant en charge une opération d'amélioration de la couverture, ou un(e) catégorie/type d'équipement utilisateur (UE) à faible complexité associé(e) à une opération de communication du type machine (MTC). En particulier, la présente invention concerne un procédé permettant à un équipement utilisateur MTC de recevoir des informations de commande et un dispositif correspondant, le procédé comprenant les étapes consistant à : surveiller un espace de recherche commun configuré selon des types d'informations de commande communes ; et recevoir les informations de commande communes transmises par l'intermédiaire de l'espace de recherche commun.
PCT/KR2016/000494 2015-01-19 2016-01-18 Procédé pour transmettre des informations de commande de liaison descendante et dispositif correspondant WO2016117885A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US15/544,363 US10306546B2 (en) 2015-01-19 2016-01-18 Method for transmitting downlink control information and device therefor
CN201680004482.5A CN107113149B (zh) 2015-01-19 2016-01-18 用于发送下行控制信息的方法和设备

Applications Claiming Priority (6)

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KR20150008486 2015-01-19
KR10-2015-0008486 2015-01-19
KR1020150135899A KR20160089844A (ko) 2015-01-19 2015-09-24 Mtc 단말을 위한 하향 링크 공용 제어 채널 송수신 방법 및 장치
KR10-2015-0135899 2015-09-24
KR1020160005012A KR101856304B1 (ko) 2015-01-19 2016-01-15 하향링크 제어정보 전송 방법 및 그 장치
KR10-2016-0005012 2016-01-15

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