WO2015072687A2 - Procédé et appareil de transmission/réception d'informations de commande - Google Patents

Procédé et appareil de transmission/réception d'informations de commande Download PDF

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Publication number
WO2015072687A2
WO2015072687A2 PCT/KR2014/010426 KR2014010426W WO2015072687A2 WO 2015072687 A2 WO2015072687 A2 WO 2015072687A2 KR 2014010426 W KR2014010426 W KR 2014010426W WO 2015072687 A2 WO2015072687 A2 WO 2015072687A2
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Prior art keywords
downlink control
control information
uss
css
subframes
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PCT/KR2014/010426
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English (en)
Korean (ko)
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WO2015072687A3 (fr
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강승현
최우진
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KT Corp
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KT Corp
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Priority claimed from KR1020140120812A external-priority patent/KR20150056450A/ko
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Publication of WO2015072687A2 publication Critical patent/WO2015072687A2/fr
Publication of WO2015072687A3 publication Critical patent/WO2015072687A3/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • 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 signalling, i.e. of overhead other than pilot signals

Definitions

  • the present invention relates to a method and apparatus for transmitting and receiving control information, and more particularly, to a method and apparatus for transmitting and receiving control information repeatedly transmitted for a terminal located in enhanced coverage.
  • Machine Type Communication or Machine to Machine (M2M) is communication between devices and things with no or minimal human intervention.
  • Machine may mean an entity that does not require direct human intervention or intervention, and "MTC” may mean 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 with 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.
  • the present invention provides a method and apparatus for transmitting and receiving control information to a terminal located in enhanced coverage in a wireless communication system.
  • the present invention is a method for allocating control information to PDCCH (Physical Downlink Control CHannel) repetitive transmission for the coverage-extended MTC terminal, CCE (Control) so that the Common Search Space (CSS) and the UE-specific Search Space (USS) does not overlap
  • PDCCH Physical Downlink Control CHannel
  • CCE Control
  • SCS Common Search Space
  • USS UE-specific Search Space
  • the coverage-expanded MTC terminal provides a method and apparatus for blind decoding downlink control information by combining the repeatedly transmitted PDCCHs.
  • a method of receiving downlink control information through a downlink control channel repeatedly allocated in a plurality of subframes is performed by a user equipment.
  • the configuration information of the plurality of subframes is transmitted through higher layer signaling.
  • SCS common search space
  • USS UE-specific search space
  • a base station transmits downlink control information through a downlink control channel repeatedly allocated in a plurality of subframes, and the configuration information for the plurality of subframes is transmitted through higher layer signaling. Transmitting; And transmitting downlink control information through the downlink control channel allocated repeatedly in the plurality of subframes, wherein the downlink control information is repeated in the downlink control channel repeatedly assigned to the plurality of subframes.
  • a method for transmitting downlink control information including a common search space (CSS) and a UE-specific search space (USS) allocated to a control channel element (CCE) without overlapping.
  • Another embodiment of the present invention is a terminal for receiving downlink control information through a repeatedly allocated downlink control channel in a plurality of subframes, and receives configuration information for the plurality of subframes through higher layer signaling. And a receiving unit for receiving downlink control information by combining the downlink control channels repeatedly allocated in the plurality of subframes based on the configuration information, wherein the downlink control information is repeatedly allocated to the plurality of subframes.
  • Common Control Space (CSS) and UE-specific Search Space (USS) are allocated to a Control Channel Element (CCE) so that the downlink control channel does not overlap and downlink control information from the combined downlink control channel It provides a terminal including a control unit for extracting.
  • a downlink transmitted to the USS in the subframe It provides a terminal characterized in that the control information is not assigned.
  • the arbitrary subframe provides a terminal characterized in that the number is 5 and the SFN (System Frame Number) is even.
  • any one of all PDCCH candidate index m values in the random subframe is allocated to CSS (CCE (CCE index is 0 ⁇ Lc * M (Lc) - ) 1, and Lc and M (Lc) are set to use the number of AL and PDCCH candidates (candidate) corresponding to CSS, the UE is characterized in that the USS of the arbitrary subframe is set by the following equation. do.
  • n CI is carrier indocator field values
  • m 0,... , M (L) -1
  • M (L) is the number of PDCCH candidates to monitor in a given search space
  • L is the aggregation level (AL)
  • 1, 2, 4, 8 in the USS
  • A 39,827
  • D 65,537
  • n s is the slot number in the radio frame.
  • the downlink control information is provided by the USS through a predefined USS dedicated subframe, and provides a terminal for receiving as a CSS through a predefined CSS dedicated subframe.
  • Another embodiment of the present invention is a base station for transmitting downlink control information through a repeatedly allocated downlink control channel in a plurality of subframes, and transmits configuration information for the plurality of subframes through higher layer signaling.
  • CCE control channel element
  • SCS common search space
  • USS UE-specific search space
  • the controller may be configured to use a CCE in which any one of all PDCCH candidate index m values is assigned to CSS in any subframe among the plurality of subframes.
  • a base station characterized by controlling not to be transmitted downlink control information.
  • the random subframe provides a base station characterized in that the number is 5 and the SFN (System Frame Number) is even.
  • control unit is a CCE (CCE index is 0 ⁇ Lc * M (Lc) -1, which is assigned to CSS any one of all PDCCH candidate index m value in the arbitrary subframe, Lc and M ( If Lc) is set to use the number of AL and PDCCH candidates corresponding to CSS), the CCE index of USS is Lc * M (Lc) to Lc * M (Lc) + Lu * M in any subframe. It provides a base station characterized in that (Lu) -1 (Lu and M (Lu) is set to the number of AL and PDCCH candidates (candidate) corresponding to the USS).
  • control unit is a CCE (CCE index is 0 ⁇ Lc * M (Lc) -1, which is assigned to CSS any one of all PDCCH candidate index m value in the arbitrary subframe, Lc and M ( When Lc) is configured to use the number of AL and PDCCH candidates corresponding to CSS), the USS of the arbitrary subframe is set by the following equation.
  • n CI is carrier indocator field values
  • m 0,... , M (L) -1
  • M (L) is the number of PDCCH candidates to monitor in a given search space
  • L is the aggregation level (AL)
  • 1, 2, 4, 8 in the USS
  • A 39,827
  • D 65,537
  • n s is the slot number in the radio frame.
  • the transmitter provides a base station, characterized in that for transmitting the downlink control information to the USS through a predefined USS dedicated subframe, and transmits to the CSS through a predefined CSS dedicated subframe.
  • the transmitter provides a base station for transmitting the downlink control information to the USS through a predefined USS dedicated subframe and a CSS through a predefined CSS dedicated subframe.
  • when repeatedly transmitting the downlink control information to the coverage-extended MTC terminal PDCCH may be configured so that CSS and USS do not overlap.
  • the coverage-expanded MTC terminal may blindly decode downlink control information by combining repeated PDCCHs.
  • 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 an example of a PDCCH coding method.
  • FIG. 3 illustrates an example of a method in which a UE having extended coverage blindly decodes a PDCCH and receives a PDSCH.
  • FIG. 4 is a diagram illustrating an example in which a USS and a CSS are configured to use the same CCE in any subframe among a plurality of subframes.
  • FIG. 5 illustrates a method of allocating CCEs so that USS according to Embodiment 1 does not overlap CSS.
  • FIG. 6 illustrates a method of transmitting and receiving downlink control information according to an embodiment.
  • FIG. 7 is a diagram illustrating a configuration of a base station according to another embodiment.
  • FIG. 8 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 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.
  • 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) 10 and a base station (Base Station, BS, or eNB) 20.
  • 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), and a radio unit (RU).
  • BTS base transceiver system
  • RRH remote radio head
  • RU radio unit
  • the base station 20 or a cell indicates 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 in a comprehensive sense and encompasses various coverage areas such as megacells, macrocells, microcells, picocells, femtocells and relay nodes, RRHs, and RU communication ranges.
  • BSC base station controller
  • the base station 20 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 the viewpoint of the user terminal or the position of the neighboring base station 20.
  • the base station 20 may be collectively referred to as a megacell, a macrocell, a microcell, a picocell, a femtocell, a small cell, an RRH, an antenna, an RU, a low power node (LPN), a point, an eNB, a transmission / reception point, a transmission point, and a reception point. It is referred to as).
  • 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 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.
  • a description of transmitting or receiving a PDCCH or transmitting or receiving a signal through the PDCCH may be used as a meaning including transmitting or receiving an EPDCCH or transmitting or receiving a signal through the 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 base station 20 performs downlink transmission to the terminals 10.
  • the base station 20 is a downlink control information and uplink data channel such as a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and scheduling required for reception of the PDSCH.
  • PDSCH physical downlink shared channel
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in eg, a physical uplink shared channel (PUSCH)
  • PUSCH physical uplink shared channel
  • the base station 20 transmits the PDSCH / PUSCH transmission resource.
  • PDCCH is used for the same subframe to be allocated.
  • the PDCCH is a physical channel for transmitting downlink control information including allocation information of PDSCH / PUSCH transmission resources.
  • the PDCCH uses a control region consisting of up to four OFDM symbols from the first OFDM symbol of a subframe.
  • the control region is composed of a plurality of CCEs (Control Channel Elements), and one CCE becomes a basic unit that can be allocated as a transmission resource of the PDCCH.
  • the control region of each serving cell is 0 to It consists of a set of CCEs. At this time Denotes the total number of CCEs in the control region of subframe k.
  • One CCE is composed of a plurality of resource elements (REs).
  • the base station 20 may set the number of CCEs used to transmit one downlink control information through the PDCCH according to the channel condition of the terminal. This is called an aggregation level (AL), and 1, 2, 4, or 8 CCEs may be used according to the channel condition of the terminal. In other words, the base station 20 determines the AL based on the geometry of the terminal.
  • AL aggregation level
  • FIG. 2 is a diagram illustrating an example of a PDCCH coding method.
  • the base station 20 in order to transmit downlink control information, the base station 20 first performs CRC encoding on the downlink control information to generate a 16-bit cyclic redundancy check (CRC). At this time, the generated CRC is masked with RNTI and pasted to downlink control information (S210).
  • the RNTI used for CRC masking uses values shown in Tables 1 and 2 below according to the type or logical channel of data transmitted through PDSCH / PUSCH.
  • the downlink control information with the CRC is encoded by using channel coding (S220). Thereafter, rate matching is performed on the mother codeword formed by channel coding coding in consideration of the number of REs constituting the CCE as much as the AL and the QPSK modulation (S230).
  • the UE 10 Since the UE 10 does not know which CCE is used by the base station 20 among a plurality of CCEs for which downlink control information transmitted to the UE forms the control region of the subframe, the UE 10 randomly selects the PDCCH used by the base station 20. In consideration of the CCE location and the arbitrary AL of the configuration, and blind decoding the received value received by the arbitrary PDCCH. If the terminal decodes the received value and de-masks using the RNTI value and succeeds in the CRC check, the terminal determines this as downlink control information allocated to the terminal.
  • PDCCH SS Search Space
  • SCS Common Search Space
  • USS UE-specific Search Space
  • the set of PDCCH candidates to monitor is defined by a search space.
  • PDCCH Search Space (SS) for AL is defined as a set of PDCCH candidates.
  • PDCCH Search Space CCEs corresponding to the PDCCH candidate m may be defined by Equation 1 below.
  • n CI and n CI are carrier indocator field values
  • m 0,... , M (L) -1
  • M (L) is the number of PDCCH candidates to monitor in a given search space.
  • L is an aggregation level (AL), which is 1, 2, 4, and 8 in the USS.
  • n s is the slot number in the radio frame.
  • ALs defining the PDCCH SS may be as shown in the following table.
  • the PDCCH SS is composed of M (L) PDCCH candidates as shown in the table above for AL L.
  • PDCCH candidate index m 0, 1, ..., M (L) -1)
  • One PDCCH candidate (candidate) is composed of L CCEs corresponding to L consecutive CCE index.
  • CSS is always composed of the CCE index 0 ⁇ L * M (L) -1 irrespective of the RNTI value of the terminal 10.
  • the USS is composed of L * M (L) CCEs of different positions in each subframe using Equation 1 according to the RNTI value and the subframe number (or slot number number) of the terminal 10.
  • the cheap MTC terminal 10 using the GSM / EGPRS network should be replaced with the MTC terminal using the LTE network, for this purpose, various requirements for lowering the price of the LTE MTC terminal 3GPP RAN It is being discussed at the WG1 standard meeting.
  • the standard meeting is preparing a document (TR 36.888) describing various functions that can be provided to satisfy the requirements.
  • the main item related to the physical layer specification change currently being discussed in 3GPP may be technologies such as narrowband support, single RF chain, half duplex FDD, and long DRX (Discontinued Reception). have.
  • the above methods which are considered to lower the price, may reduce the performance of the MTC terminal compared to the conventional LTE terminal.
  • the coverage of LTE MTC terminals is compared with that of conventional LTE terminals for successful MTC data transmission. 20dB should be improved. 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 requirements of the LTE-based low-cost MTC terminal is as follows.
  • 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 must be significantly improved 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.
  • Legacy LTE terminal and LTE MTC terminal should be available in the same frequency.
  • Low-cost LTE MTC terminals must support limited mobility and low power consumption modules.
  • the data of each physical channel which is conventionally transmitted only in one subframe unit, is repeated in a plurality of subframes. Can be considered to transmit.
  • the terminal 10 receiving the same may perform soft combining on the same transmission data in consideration of the number of repeated subframes and then decode the transmitted data.
  • the terminal 10 having 20 dB coverage extension may not succeed in blind decoding. Accordingly, it may be considered to repeatedly transmit downlink control information transmitted only in one subframe unit to a plurality of subframes.
  • the receiving terminal 10 may decode the transmitted downlink control information after performing soft combining on the same downlink control information in consideration of the number of repeated subframes.
  • FIG. 3 illustrates an example of a method in which a UE having extended coverage blindly decodes a PDCCH and receives a PDSCH.
  • the base station 20 repeats one downlink control information through four subframes of SF # 0 (Subframe Number # 0) to SF # 3 in consideration of the channel condition of the terminal 10. send. In addition, the base station 20 repeatedly transmits the same data through four subframes of SF # 3 to SF # 6 in consideration of the channel condition of the terminal 10.
  • the terminal 10 blindly decodes all the received values of the downlink control information transmitted from SF # 0 to SF # 3 by blind decoding, the terminal 10 is included in the downlink control information. Check the scheduling information of the PDSCH. The terminal 10 performs soft decoding on all received values of data transmitted from SF # 3 to SF # 6 to perform decoding.
  • a transmission resource of a PDSCH through which data is transmitted is allocated from the last subframe among a plurality of subframes to which a PDCCH to which downlink control information is transmitted is allocated.
  • the present invention is not limited thereto, and a relationship between a plurality of subframes in which downlink control information is repeatedly transmitted and a plurality of subframes in which data is repeatedly transmitted may be different.
  • the transmission resource of the PDSCH through which data is transmitted may be allocated from the next subframe of the last subframe among the plurality of subframes to which the PDCCH to which downlink control information is transmitted is allocated.
  • the plurality of subframes in which downlink control information is repeatedly transmitted and the plurality of subframes in which data is repeatedly transmitted may be the same.
  • PUSCH scheduling information may also be obtained by blind decoding PDCCH / EPDCCH.
  • the present invention is a method of transmitting a PDCCH for the coverage-extended MTC terminal 10, and more specifically, a method of repeatedly transmitting the same downlink control information in a plurality of subframes.
  • the PDCCH When the PDCCH is repeatedly transmitted in a plurality of subframes, the PDCCH may be repeatedly transmitted using the same AL and the same PDCCH candidate index (or indicate) m in each subframe. In this case, it can be seen that different CCE indexes are used for each subframe with respect to the same PDCCH candidate index m.
  • the PDCCH candidates for each subframe (where sf # means subframe number) for each AL of the USS.
  • the first CCE index used for m is calculated as shown in Table 3 below.
  • the USC and the CSS use the same CCE index in a specific subframe.
  • the coverage-expanded MTC terminal 10 has the following problem.
  • the coverage-extended MTC terminal 10 may not succeed in PDCCH blind decoding for downlink control information transmitted in one subframe. Accordingly, the terminal 10 determines whether downlink control information is transmitted to CSS, downlink control information to USS, or downlink control information to both CSS and USS in one subframe. Can not confirm.
  • FIG. 4 is a diagram illustrating an example in which a USS and a CSS are configured to use the same CCE in any subframe among a plurality of subframes.
  • the same PDCCH candidate m may be repeatedly transmitted using different CCE indexes in a plurality of subframes.
  • the USS and the CSS may be configured to use the same CCE in any subframe (SF # 4 of FIG. 4) among the plurality of subframes.
  • the terminal 10 performs blind decoding by combining PDCCH reception values for different downlink control information transmitted through USS and CSS.
  • the terminal 10 fails to blindly decode both downlink control information transmitted to the CSS and the USS.
  • the present invention provides a method and apparatus for allocating control information to the PDCCH repetitive transmission for the coverage-extended MTC terminal 10, so that the USS does not overlap with the CSS.
  • the present invention also provides a method and apparatus for performing PDCCH repetitive transmission and reception for an MTC terminal 10 whose coverage is extended to a CCE allocated so that the USS does not overlap with CSS.
  • the base station 20 may repeatedly transmit PDCCH downlink control information using the CCE of the USS using the same PDCCH candidate index m in a plurality of subframes.
  • CCE CCE index is 0 to Lc * M (Lc) -1, and Lc and M (Lc) are AL and PDCCH candidates corresponding to CSS. (candidate) number)
  • the downlink control information transmitted to the USS in the corresponding subframe does not repeatedly transmit the PDCCH. If the USS and the CSS do not overlap, the PDCCH repeatedly transmits downlink control information transmitted to the USS in the corresponding subframe.
  • the following subframe also checks whether the USS and the CSS overlap, and if the USS and the CSS overlap, the downlink control information transmitted to the USS in the subframe does not repeatedly transmit the PDCCH, and if the USS and the CSS do not overlap PDCCH repetitive transmission of downlink control information transmitted to the USS.
  • the base station 20 repeats the above process until the number of subframes N used for repeated transmission of the PDCCH set according to the geometry of the terminal 10 or the channel state of the terminal 10 is transmitted to the same USS.
  • the PDCCH is repeatedly transmitted in N subframes.
  • the downlink control information transmitted to the CSS may be transmitted in the corresponding subframe regardless of whether the USS and the CSS overlap each other.
  • FIG. 5 illustrates a method of allocating CCEs so that USS according to Embodiment 1 does not overlap CSS.
  • the base station 20 repeats the PDCCH using downlink control information using the CCE of the USS using the same PDCCH candidate index m in a plurality of subframes SF # 0 to SF # 4.
  • PDCCH repeatedly transmits downlink control information transmitted to the USS in the corresponding subframes SF # 0 to SF # 3.
  • the base station 20 does not allocate the downlink control information transmitted to the USS to the corresponding subframe (SF # 4) In the subframe SF # 4, the downlink control information transmitted to the USS is not repeatedly transmitted through the PDCCH.
  • the following subframe also checks whether the USS and the CSS overlap. If the USS and the CSS overlap, the downlink control information transmitted to the USS in the corresponding subframe does not repeatedly transmit the PDCCH. If the and CSS do not overlap, the PDCCH is repeatedly transmitted downlink control information transmitted to the USS.
  • the base station 20 repeats the above-described process of allocating the CCE until the number N of the plurality of subframes set for the specific terminal 10 is satisfied, and thus, N subframes for downlink control information transmitted to the same USS. PDCCH can be repeatedly transmitted.
  • the base station 20 may repeatedly transmit PDCCH downlink control information using the CCE of the USS using the same PDCCH candidate index m in a plurality of subframes.
  • the base station 20 downlink control information for the SIB1 transmitted to the CSS Transmits and does not repeatedly transmit the downlink control information transmitted to the USS PDCCH.
  • SIB1 System Information Block Type 1
  • subframe number 5 subframe number 5
  • SFN System Frame Number
  • the base station 20 repeatedly transmits PDCCH downlink control information transmitted to the USS in the corresponding subframe and does not transmit downlink control information transmitted to the CSS.
  • the base station 20 may repeatedly transmit PDCCH downlink control information using the CCE of the USS using the same PDCCH candidate index m in a plurality of subframes.
  • CCE CCE index is 0 to Lc * M (Lc) -1
  • Lc and M (Lc) are assigned to CSS.
  • the base station 20 is configured so that the USS is set immediately after the CCE index set to CSS in the corresponding subframe (SF # 4 in FIG. 4).
  • Set the CCE index of USS from Lc * M (Lc) to Lc * M (Lc) + Lu * M (Lu) -1.
  • Lu and M (Lu) means the number of AL and PDCCH candidates (candidate) corresponding to the USS.
  • CSS is set to CCE indexes 0 to 15 in any subframe and the USS is set to overlap some or all of the CCEs of the set CSS
  • the USS is set to CCE indexes 16 to 16 in the subframe. + Lu * M (Lu) Set to -1.
  • the base station 20 may repeatedly transmit PDCCH downlink control information using the CCE of the USS using the same PDCCH candidate index m in a plurality of subframes.
  • CCE CCE index is 0 to Lc * M (Lc) -1, and Lc and M (Lc) are assigned to CSS. If the corresponding AL and PDCCH candidates () are set to be used, the USS of the corresponding subframe is replaced by Y k used in Equation 2. Can be used.
  • n CI and n CI are carrier indocator field values
  • m 0,... , M (L) -1
  • M (L) is the number of PDCCH candidates to monitor in a given search space.
  • L is an aggregation level (AL), which is 1, 2, 4, and 8 in the USS.
  • n s is the slot number in the radio frame.
  • K + A value of> 9 can be used instead of Y k to set the CCE index constituting the USS.
  • Y 10 , Y 11 , Y 12 ,... Instead of Y k until the USS does not overlap CSS. Can be used in order of the value of. Also, for example, if the USS and CSS are overlapped in SF # 5 and SF # 9 and Y k Y 10 is used in SF # 5 to solve the problem of overlapping the USS and CSS, SF # 5 is SF # 5. It can be set to use from Y 11 which is after the value of Y k used in.
  • the base station 20 may predefine a USS dedicated subframe for transmitting downlink control information to the USS and a CSS dedicated subframe for transmitting the downlink control information to the CSS. .
  • the base station 20 may repeatedly transmit downlink control information to the USS in a predefined USS dedicated subframe and transmit downlink control information to the predefined CSS dedicated subframe in CSS.
  • the base station 20 and the terminal 10 may use a predefined subframe subset in order for the terminal 10 to distinguish between the USS dedicated subframe subset and the CSS dedicated subframe subset.
  • the base station 20 may inform the terminal 10 of the subframe subset information by a higher layer signal.
  • the subframe subset information may be included in configuration information of a plurality of subframes related to PDCCH repetitive transmission.
  • the UE 10 may check whether the CCEs are allocated to the subframes according to Embodiments 1 to 5 and whether the CSS and the USS overlap with each other, the UE 10 transmits them to a plurality of subframes before blind decoding. The same method may be used to combine the received values of the PDCCHs.
  • FIG. 6 illustrates a method of transmitting and receiving downlink control information according to an embodiment.
  • the base station 20 allocates CCEs such that CSS and USS do not overlap a plurality of subframes (S610).
  • the base station 20 allocates CCEs so that CSS and USS do not overlap the plurality of subframes according to the first to fifth embodiments.
  • the base station 20 transmits configuration information for a plurality of subframes in which downlink control information is repeatedly transmitted through higher layer signaling to the terminal 10 (S620).
  • the base station 20 performs PDCCH repetitive transmission on the plurality of subframes according to the configuration information on the plurality of subframes (S630).
  • the base station 20 repeatedly transmits the downlink control information using the same PDCCH candidate index in a plurality of subframes using the CCE of the USS, and overlaps the USS and CSS.
  • the downlink control information transmitted to the USS does not repeatedly transmit the PDCCH.
  • the base station 20 repeats the process of allocating the above-described CCE until the number N of the subframes set for the specific terminal 10 is satisfied and repeats the downlink control information transmitted to the same USS in N subframes. Can transmit
  • Embodiment 2 when any one of all PDCCH candidate index m values in any subframe is set to use CCE of CSS, and the corresponding subframe number is 5 and the SFN (System Frame Number) is an even base station 20 transmits downlink control information transmitted through CSS and does not repeatedly transmit downlink control information transmitted through USS. Otherwise, the base station 20 repeatedly transmits PDCCH downlink control information transmitted to the USS in the corresponding subframe and does not transmit downlink control information transmitted to the CSS.
  • SFN System Frame Number
  • Embodiment 3 if any one of all PDCCH candidate index m values in any subframe is allocated to CSS, the CCE (CCE index is 0 to Lc * M (Lc) -1, and Lc and M ( Lc) is set to use the number of AL and PDCCH candidates (candidate) corresponding to CSS, so that USS is set immediately after the CCE index set to CSS in the corresponding subframe (SF # 4 in FIG. 4).
  • Set the CCE index of USS from Lc * M (Lc) to Lc * M (Lc) + Lu * M (Lu) -1.
  • Embodiment 4 if any one of all PDCCH candidate index m values in any subframe is allocated to CSS, the CCE (CCE index is 0 to Lc * M (Lc) ⁇ 1, and Lc and M If (Lc) is set to use the number of AL and PDCCH candidates corresponding to CSS), the USS of the corresponding subframe is instead of Y k used in the equation. Can be used.
  • the base station 20 may repeatedly transmit downlink control information to the USS in a predefined USS dedicated subframe and transmit downlink control information to the predefined CSS dedicated subframe in CSS.
  • the terminal 10 performs PDCCH repetitive reception with a plurality of subframes according to the configuration information on the plurality of subframes.
  • Embodiment 1 when performing PDCCH repetitive reception with a plurality of subframes, a CCE in which any one of all PDCCH candidate index m values in any subframe among a plurality of subframes is allocated to CSS is used. When configured to do so, the downlink control information transmitted to the USS may not be allocated to any subframe.
  • any subframe may have a number of 5 and an even system frame number (SFN).
  • SFN system frame number
  • any one of all PDCCH candidate index m values in any subframe is allocated to CSS (CCE (CCE index is 0 to Lc * M (Lc) -1 ) , and Lc and M (Lc ) Is set to use the number of AL and PDCCH candidates corresponding to CSS,), in any subframe, the CCE index of USS is Lc * M (Lc) to Lc * M (Lc) + Lu * M (Lu ) -1 (Lu and M (Lu) may be set to the number of AL and PDCCH candidates (candidate) corresponding to the USS).
  • CCE (CCE index is 0 to Lc * M (Lc) -1 assigned to any one of all PDCCH candidate index m values in CSS in any subframe, and Lc and M (Lc). ) Is set to use the number of AL and PDCCH candidates (candidate) corresponding to CSS, USS of any subframe may be set by Equation 2 below.
  • the downlink control information may be received in the USS through a predefined USS dedicated subframe and may be received in the CSS through a predefined CSS dedicated subframe.
  • the UE 10 may check whether the CCEs are allocated to the subframes according to Embodiments 1 to 5 and whether the CSS and the USS overlap with each other, the UE 10 transmits them to a plurality of subframes before blind decoding. The same method may be used to combine the received values of the PDCCHs.
  • the terminal 10 performs blind decoding after soft combining the downlink control information received values in the subframe determined based on the configuration information of the plurality of subframes (S640).
  • the terminal 10 obtains scheduling information of the PDSCH transmission resource or the PUSCH transmission resource included in the downlink control information (S650).
  • the terminal 10 receives the PDSCH or transmits the PUSCH based on the obtained scheduling information (S660). In this step, the base station 20 transmits a PDSCH or receives a PUSCH based on the scheduling information.
  • FIG. 7 is a diagram illustrating a configuration of a base station according to another embodiment.
  • the base station 700 includes a controller 710, a transmitter 720, and a receiver 730.
  • the control unit 710 is a method for allocating the PDCCH repetitive transmission for the coverage-expanded MTC terminal required to carry out the above-described present invention. .
  • the transmitter 720 and the receiver 730 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
  • the transmitter 720 transmits configuration information for a plurality of subframes in which downlink control information is repeatedly transmitted through higher layer signaling to the terminal.
  • the transmitter 720 performs PDCCH repetitive transmission on the plurality of subframes according to the configuration information on the plurality of subframes.
  • the control unit 710 allocates the CCE so that the USS does not overlap with the CSS according to one of the embodiments 1 to 5 when the PDCCH repeated transmission for the coverage-extended MTC terminal.
  • the controller 710 is transmitted to the USS in any subframe.
  • the downlink control information may be controlled not to be allocated.
  • the arbitrary subframes may have a number of five and an even system frame number (SFN).
  • control unit 710 is CCE (CCE index is 0 ⁇ Lc * M (Lc) -1, which is assigned to CSS any one of all PDCCH candidate index m value in any subframe, Lc and M If (Lc) is set to use the number of AL and PDCCH candidates corresponding to CSS), and in any subframe, the CCE index of USS is Lc * M (Lc) to Lc * M (Lc) + Lu * M (Lu) -1 (Lu and M (Lu) can be set to the number of AL and PDCCH candidates (candidate) corresponding to the USS).
  • control unit 710 is a CCE (CCE index is 0 ⁇ Lc * M (Lc) -1, which is assigned to CSS any one of all PDCCH candidate index m value in the arbitrary subframe, Lc and
  • M (Lc) is set to use the number of AL and PDCCH candidates corresponding to CSS
  • the USS of any subframe may be set by Equation 2 below.
  • the transmitter 720 may transmit the downlink control information to the USS through a predefined USS dedicated subframe, and may transmit the CSS to the CSS through a predefined CSS dedicated subframe.
  • FIG. 8 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • the user terminal 800 includes a receiver 810, a controller 820, and a transmitter 830.
  • the receiver 810 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • control unit 820 is a method for allocating the PDCCH repetitive transmission for the coverage-expanded MTC terminal required to carry out the above-described present invention. do.
  • the transmitter 830 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the transmitter 830 performs repeated reception of the PDCCH in the plurality of subframes according to the configuration information on the plurality of subframes.
  • the controller 820 may check whether the CSS and the USS overlap with the methods for allocating the CCE according to the first to fifth embodiments with respect to any subframe.
  • the control unit 820 performs blind decoding after soft combining the downlink control information reception value in the subframe determined based on the configuration information for the plurality of subframes. If the blind decoding succeeds, the controller 820 acquires scheduling information of the PDSCH transmission resource or the PUSCH transmission resource included in the downlink control information.
  • the receiver 810 receives the PDSCH based on the obtained scheduling information, or the transmitter 830 transmits the PUSCH based on the obtained scheduling information (S660).
  • PDCCH when repeatedly transmitting the downlink control information to the coverage-extended MTC terminal PDCCH may be configured so that CSS and USS do not overlap. Accordingly, the coverage-extended MTC terminal may blindly decode downlink control information by combining the repeatedly transmitted PDCCHs.

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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 de réception d'informations de commande en liaison descendante et un terminal correspondant, et un procédé de transmission d'informations de commande en liaison descendante correspondant au procédé de réception d'informations de commande en liaison descendante et une station de base correspondante. Le procédé de réception, par un terminal, d'informations de commande en liaison descendante via des canaux de commande de liaison descendante attribués de façon répétée dans une pluralité de sous-trames, comprend les étapes consistant à : recevoir des informations de configuration relatives à la pluralité de sous-trames via une signalisation de couche supérieure ; recevoir les informations de commande en liaison descendante en combinant les canaux de commande de liaison descendante attribués de façon répétée dans la pluralité de sous-trames d'après les informations de configuration, les informations de commande en liaison descendante étant attribuées à un élément de canal de commande (CCE) de telle sorte qu'un espace de recherche commun (CSS) et un espace de recherche spécifique à un EU (USS) ne se chevauchent pas dans les canaux de commande de liaison descendante attribués de façon répétée à la pluralité de sous-trames ; et extraire les informations de commande en liaison descendante, des canaux de commande de liaison descendante combinés et reçus.
PCT/KR2014/010426 2013-11-14 2014-11-03 Procédé et appareil de transmission/réception d'informations de commande Ceased WO2015072687A2 (fr)

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KR10-2013-0138661 2013-11-14
KR20130138661 2013-11-14
KR1020140120812A KR20150056450A (ko) 2013-11-14 2014-09-12 제어 정보 송수신 방법 및 그 장치
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110536451A (zh) * 2019-09-03 2019-12-03 中兴通讯股份有限公司 信息增强方法、装置、设备和存储介质
WO2020143617A1 (fr) * 2019-01-11 2020-07-16 电信科学技术研究院有限公司 Procédé de transmission de canal de commande de liaison descendante, terminal et dispositif côté réseau
CN114286427A (zh) * 2020-09-28 2022-04-05 中国移动通信有限公司研究院 一种控制信道处理方法、装置、设备及可读存储介质
EP4539382A3 (fr) * 2018-05-11 2025-06-25 QUALCOMM Incorporated Communication ultra-fiable à faible latence avec de multiples points de transmission-réception

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
KR101468767B1 (ko) * 2010-06-08 2014-12-08 한국전자통신연구원 다중 캐리어 무선 통신 시스템에서의 송수신 방법 및 장치
WO2013012151A1 (fr) * 2011-07-19 2013-01-24 엘지전자 주식회사 Procédé et appareil de transmission-réception d'informations de contrôle en liaison descendante au sein d'un système de communication sans fil
WO2013025086A2 (fr) * 2011-08-18 2013-02-21 엘지전자 주식회사 Procédé pour l'affectation d'un canal de commande et appareil à cet effet
KR20130058565A (ko) * 2011-11-25 2013-06-04 주식회사 팬택 송수신 포인트, 송수신 포인트의 제어 정보 전송 방법, 단말, 및 단말의 제어 정보 수신 방법
WO2013129883A1 (fr) * 2012-02-29 2013-09-06 엘지전자 주식회사 Procédé et appareil pour la recherche d'informations de commande dans un système de communication sans fil

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4539382A3 (fr) * 2018-05-11 2025-06-25 QUALCOMM Incorporated Communication ultra-fiable à faible latence avec de multiples points de transmission-réception
WO2020143617A1 (fr) * 2019-01-11 2020-07-16 电信科学技术研究院有限公司 Procédé de transmission de canal de commande de liaison descendante, terminal et dispositif côté réseau
CN110536451A (zh) * 2019-09-03 2019-12-03 中兴通讯股份有限公司 信息增强方法、装置、设备和存储介质
US12395300B2 (en) 2019-09-03 2025-08-19 Zte Corporation Information enhancement method and apparatus, device, and storage medium
CN114286427A (zh) * 2020-09-28 2022-04-05 中国移动通信有限公司研究院 一种控制信道处理方法、装置、设备及可读存储介质

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