WO2015060631A1 - 하향링크 제어정보 송수신 방법 및 장치 - Google Patents
하향링크 제어정보 송수신 방법 및 장치 Download PDFInfo
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- WO2015060631A1 WO2015060631A1 PCT/KR2014/009922 KR2014009922W WO2015060631A1 WO 2015060631 A1 WO2015060631 A1 WO 2015060631A1 KR 2014009922 W KR2014009922 W KR 2014009922W WO 2015060631 A1 WO2015060631 A1 WO 2015060631A1
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- control information
- downlink control
- duplex mode
- tdd
- downlink
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2615—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid frequency-time division multiple access [FDMA-TDMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a method and apparatus for transmitting and receiving downlink control information, and to a method and apparatus for configuring a downlink control information transmission format in a carrier aggregation situation between serving cells having different duplex modes.
- LTE Long Term Evolution
- LTE-Advanced of the current 3GPP series are high-speed, high-capacity communication systems that can transmit and receive various data such as video and wireless data, out of voice-oriented services.
- the development of technology capable of transferring large amounts of data is required.
- a carrier aggregation technology for transmitting and receiving data for a terminal by merging a plurality of frequency bands and a dual connectivity technology for transmitting and receiving data through a plurality of base stations are developed. It is becoming.
- the terminal may communicate with the base station using component carriers or serving cells in different duplex modes, and thus, a method for transmitting downlink control information in different duplex modes and Definition of the device is required.
- the present invention proposes a method and apparatus for transmitting downlink control information when a terminal performs communication using a component carrier or a serving cell having a different duplex mode.
- the present invention also proposes a method and apparatus for defining a downlink control information format for a component carrier or a serving cell having a different duplex mode when the terminal transmits downlink control information.
- the base station transmits the downlink control information, the downlink control information format based on the duplex mode of any one of a plurality of cells configured in the terminal performing carrier aggregation And transmitting downlink control information using a downlink control information format.
- the present invention also provides a method for receiving downlink control information by a terminal, comprising: configuring carrier aggregation using a plurality of cells having different duplex modes; And receiving downlink control information through a downlink control information format configured based on a duplex mode of one of the cells of the cell.
- the present invention provides a base station for transmitting the downlink control information, the control unit and the downlink configured to configure the downlink control information format based on the duplex mode of any one of a plurality of cells configured in the terminal performing carrier aggregation
- a base station apparatus including a transmitter for transmitting downlink control information using a control information format.
- the present invention in the terminal receiving the downlink control information, a carrier merge configuration using a plurality of cells having a different duplex mode, cross-carrier scheduling between a plurality of cells and a control unit and a plurality of cells
- a terminal apparatus including a receiver configured to receive downlink control information through a downlink control information format configured based on a duplex mode of one cell.
- the present invention has an effect of providing a method and apparatus for transmitting downlink control information when a terminal performs communication using a component carrier or a serving cell having different duplex modes.
- the present invention has an effect of providing a method and apparatus for defining a downlink control information format for a component carrier or a serving cell having a different duplex mode when the terminal transmits the downlink control information.
- FIG. 1 is a diagram illustrating a frame structure type of an FDD duplex mode.
- FIG. 2 is a diagram illustrating an example of a frame structure type of a TDD duplex mode.
- FIG. 3 is a diagram illustrating an uplink and a downlink configuration in a TDD frame structure.
- FIG. 4 is a diagram illustrating an example of inter-node radio resource aggregation to which the present invention can be applied.
- FIG. 5 illustrates a case in which the FDD uplink band operates in the TDD duplex mode.
- FIG. 6 is a diagram illustrating an example of transmission of a control region for transmitting a control channel in one subframe.
- FIG. 7 illustrates an example of transmission of a PDSCH indicated by a control channel transmitted in every subframe when the PDSCH is transmitted on a multiple carrier.
- FIG. 8 is a diagram for explaining that downlink control information formats according to the present invention are classified according to a transmission method and a use destination.
- FIG. 9 is a diagram exemplarily illustrating an information element for transmitting whether to establish cross-carrier scheduling according to an embodiment of the present invention.
- FIG. 10 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention.
- FIG. 11 is a flowchart illustrating an operation of a terminal according to another embodiment of the present invention.
- FIG. 12 is a diagram illustrating an information element for designating a DCI format according to another embodiment of the present invention.
- FIG. 13 is a view showing the configuration of a base station according to another embodiment of the present invention.
- FIG. 14 is a view showing the configuration of a user terminal 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 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.
- 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
- 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 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
- a frame including an uplink subframe for transmitting data and control information from a terminal to a base station and a downlink subframe for transmitting data and control information from a base station to a terminal in an arbitrary frequency band.
- Two types of frame structures are defined as frame structures.
- FIG. 1 is a diagram illustrating a frame structure type of an FDD duplex mode.
- the frame structure type of FIG. 1 is a structure in which ten 1 ms downlink subframes and ten 1 ms uplink subframes are transmitted through different frequency bands during a radio frame interval of 10 ms, respectively.
- the frame structure of FIG. 1 is a frame structure for supporting a frequency division duplex (FDD) mode.
- FDD frequency division duplex
- the frame structure of the FDD mode has a pair of an uplink frequency band and a downlink frequency band.
- the terminal may transmit control information and data to the base station through a subframe of the uplink frequency band.
- the base station may transmit control information and data through a subframe of the downlink frequency band.
- the frame structure according to the duplex mode of each of the FDD and the TDD is referred to as an FDD frame structure and a TDD frame structure.
- the frame structure when describing that the frame structure is TDD, it means a frame structure in the TDD duplex mode.
- the frame structure is described as the case of FDD, this means the frame structure in the FDD duplex mode.
- FIG. 2 is a diagram illustrating an example of a frame structure type of a TDD duplex mode.
- the frame structure type of FIG. 2 is duplexed on the time axis in the same frequency band in which a downlink subframe of 1 ms and an uplink subframe of 1 ms are respectively applied during a radio frame interval of 10 ms.
- TDD time division duplex
- a special subframe in the TDD frame structure is a subframe for securing a guard period (GP) in a terminal for switching from a downlink subframe to an uplink subframe.
- GP guard period
- the current LTE / LTE-Advanced TDD system supports a total of seven TDD UL-DL configurations as shown in FIG. 3.
- FIG. 3 is a diagram illustrating an uplink and a downlink configuration in a TDD frame structure.
- uplink-downlink configuration may be configured in seven types from 0 to 6 in total. Each configuration is different in the time axis arrangement of the uplink subframe and the downlink subframe.
- the 0 th subframe is a downlink subframe, and special subframes and three uplink subframes are arranged in this order. Thereafter, five subframes are repeated in the same order.
- TDD a configuration according to the arrangement of subframes is defined.
- denoted D is a downlink subframe
- denoted U is an uplink subframe
- denoted S is a special subframe.
- FIG. 4 is a diagram illustrating an example of inter-node radio resource aggregation to which the present invention can be applied.
- a base station providing a macro cell and a base station providing a small cell may provide overlapped coverage.
- the terminal may perform communication by forming a dual connection with the base station providing the macro cell and the base station providing the small cell.
- the macro cell and the small cell may use different frequency bands, or may be in different duplex modes.
- the macro cell may use the F1 frequency and the small cell may use the F2 frequency. Or vice versa or use the same frequency band.
- the macro cell may use the FDD mode, the small cell may use the TDD mode, and conversely, the macro cell may use the TDD mode and the small cell may use the FDD mode. Or may be in the same duplexing mode.
- the LTE Release-8 / 9 system uses FDD or TDD based on a single frequency band for each mobile carrier to transmit and receive data and control information between a mobile station and a base station. Data transmission and reception was possible.
- a carrier aggregation (CA) technology is introduced to transmit and receive data for a terminal by merging a plurality of frequency bands as a method for increasing the data rate.
- the carrier merging technique supports merging only between frequency bands that support the same duplex mode. That is, carriers supporting the UE in the FDD duplex mode can only merge the carriers between the FDD frequency bands, and carriers supporting the UE in the TDD duplex mode based on the TDD duplex mode are supported only by the carrier aggregation between the TDD frequency bands.
- FIG. 5 illustrates a case in which the FDD uplink band operates in the TDD duplex mode.
- another scenario of a joint TDD-FDD operation includes a lack of FDD DL channel resources and an FDD UL channel resource in a typical DL-centric traffic asymmetry environment.
- a scenario of using a part of subframes of the uplink band of the FDD for downlink has been proposed. That is, in order to use some of the UL subframes of the UL band (frequency band) in the FDD UL-DL pair as a DL subframe for transmitting downlink data as shown in FIG.
- DCI Downlink Control Information
- FIG. 6 is a diagram illustrating an example of transmission of a control region for transmitting a control channel in one subframe.
- the control region 610 includes transmission of PHICH, PCFICH, and PDCCH.
- the control region may be configured with 1 to 3 OFDM symbols, but is not limited thereto.
- the control region may be increased or decreased according to the situation of the system.
- the PDCCH is spread evenly allocated to the number of OFDM symbols in which the PDCCH indicated by the PCFICH is transmitted, except for the resources used for the PHICH and the PCFICH, and then transmitted. Control signaling and a cell-specific reference symbol are distributed in a subframe.
- FIG. 7 illustrates an example of transmission of a PDSCH indicated by a control channel transmitted in every subframe when the PDSCH is transmitted on a multiple carrier.
- FIG. 7 is a diagram illustrating transmission of a PDSCH indicated by a control channel transmitted in every subframe when a PDSCH is transmitted on a multiple carrier.
- the carrier indicator is not included in the downlink control information (DCI).
- DCI downlink control information
- 720 indicates cross-carrier scheduling on multiple carriers and includes a carrier indicator in DCI.
- the present invention relates to a case in which a PDSCH can be scheduled to a plurality of carriers in one carrier.
- a PDCCH existing in one carrier schedules a PDSCH that can be transmitted on a plurality of carriers.
- data is transmitted in multiple carriers by a control channel transmitted every subframe within a 1 ms subframe.
- FIG. 8 is a diagram for explaining that downlink control information formats according to the present invention are classified according to a transmission method and a use destination.
- FIG. 8 is a downlink control information (DCI) format indicating a scheduling grant for uplink / downlink transmission.
- DCI formats are separately transmitted according to each uplink / downlink transmission method and usage.
- a difference occurs in the information area configuring the DCI format according to the duplex mode of the carrier or serving cell. For example, a difference may occur in whether a downlink assignment index (DAI) information area exists or the size of an information area for HARQ (Hybrid-ARQ) process number assignment.
- DAI downlink assignment index
- Hybrid-ARQ Hybrid-ARQ
- an information region for PUSCH / PDSCH resource allocation included in each DCI format in an FDD system and a TDD system is described in detail in 3GPP TS 36.212.
- the carrier merging method applied in the conventional 3GPP LTE / LTE-Advanced system only carrier merging between component carriers or serving cells operating in the same frame structure or duplex mode is applied.
- carrier aggregation between different TDD carriers and FDD carriers is newly applied, transmission of scheduling information according to a frame structure of a component carrier or a serving cell in which data scheduling is performed is performed. It is necessary to define the DCI format used for this purpose.
- cross-carrier scheduling it is necessary to define for each scenario whether downlink control information is transmitted using a DCI format among a TDD type DCI format and an FDD type DCI format.
- the present invention proposes a method of defining a DCI format to be used for downlink control information transmission when carrier aggregation is applied between TDD and FDD carriers.
- a DCI format used for transmission of scheduling information according to a frame structure of a serving cell in which a scheduling DCI for a corresponding serving cell is transmitted is determined. Suggest ways to define.
- a scheduling method for any terminal to which carrier aggregation is applied resource allocation information for a data channel such as a PDSCH or a PUSCH in one serving cell is assigned to a downlink sub-servo of the serving cell.
- a self-scheduling method that is signaled through a downlink control channel (PDCCH or EPDCCH) transmitted through a downlink subframe.
- PDCH downlink control channel
- cross-carrier scheduling in which resource allocation information for a data channel such as a PDSCH or a PUSCH in one serving cell is signaled through a downlink control channel of another serving cell There is a way.
- cross-carrier scheduling is set in any serving cell or component carrier for any UE to which carrier aggregation is applied is determined by higher layer signaling (eg, RRC signaling) of the base station as follows. Can be set.
- RRC signaling eg, RRC signaling
- FIG. 9 is a diagram exemplarily illustrating an information element for transmitting whether to establish cross-carrier scheduling according to an embodiment of the present invention.
- the CrossCarrierSchedulingConfig information element of FIG. 9 may be used to specify the configuration when cross-carrier scheduling is used in a particular cell (The IE CrossCarrierSchedulingConfig is used to specify the configuration when the cross carrier scheduling is used in a cell).
- Each field included in the information element of FIG. 9 plays a role disclosed in Table 1.
- information on a scheduling cell in which DL allocation and UL grant control information is transmitted for the serving cell is determined. It is set and sent.
- a serving cell or component carrier for which cross-carrier scheduling is configured is referred to as a scheduled cell, and the PDSCH of the scheduled cell is referred to.
- the serving cell to which the PUSCH resource allocation control information is transmitted is referred to as a scheduling cell.
- the scheduling cell may mean a primary cell (PCell), and the scheduled cell may mean a secondary cell (SCell). That is, the PDell or PUSCH resource allocation control information of the SCell may be transmitted from the PCell.
- PCell primary cell
- SCell secondary cell
- the FDD type DCI format means that an information region constituting the DCI format for any one DCI format follows an information region defined for the FDD system, and the TDD type DCI format corresponds to the same DCI format. This means that the information region constituting the DCI format follows the information region defined for the TDD system.
- the DCI format 1A including the information areas applied in the FDD system is referred to as the FDD type DCI format 1A even though the DCI format 1A is thus described.
- DCI format 1A including information areas applied in a TDD system is referred to as a TDD type DCI format 1A.
- other DCI formats may be separately described in a TDD type DCI format and an FDD type DCI format.
- an FDD type is used for scheduling data channels in FDD serving cells regardless of whether cross-carrier scheduling is configured.
- the DCI format was used, and the TDD type DCI format was used for data channel scheduling in the TDD serving cells.
- cross-carriers between serving cells or component carriers supporting different frame structures are applied.
- cross-carrier scheduling it is necessary to define which DCI format should be used. That is, there is an ambiguous definition of whether to use the FDD type DCI format or the TDD type DCI format.
- the present invention provides a method and apparatus for setting a type of DCI format for transmitting scheduling information when cross scheduling is supported between a plurality of serving cells or component carriers having different duplex modes.
- the scheduling cell described in each embodiment below may mean the PCell described above, and the scheduled cell may mean an SCell.
- the portion described as the serving cell may mean a component carrier.
- a scheduling cell in which DCI is transmitted for a scheduled cell is transmitted regardless of a frame structure of a scheduled cell in which cross-carrier scheduling is configured. cell) or a PCell frame structure according to a PCell.
- resource allocation control information (DL assignment DCI or UL grant DCI) for a data channel (PDSCH or PUSCH) in an FDD serving cell is transmitted through a TDD serving cell
- scheduling control for the corresponding FDD serving cell Even transmission of information may be defined to use a TDD type DCI format.
- scheduling control information for the corresponding TDD serving cell may also be used. It can be defined to use the FDD type DCI format.
- FIG. 10 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention.
- a base station configures a downlink control information format based on a duplex mode of one of a plurality of cells configured in a terminal performing carrier aggregation. And transmitting downlink control information using a downlink control information format.
- the base station of the present invention includes configuring a downlink control information format in order to transmit downlink control information to a terminal performing carrier aggregation (S1010).
- the UE configures carrier aggregation into a plurality of cells having different duplex modes and performs cross-carrier scheduling.
- the base station may configure the downlink control information format based on the duplex mode of the PCell or the scheduling cell.
- scheduling control information for the SCell may be transmitted to the PCell.
- the base station may configure and transmit scheduling control information for the SCell in the downlink control information format of the FDD serving cell which is the PCell. That is, the downlink control information format may be configured according to the duplex mode of the primary cell (PCell) of the terminal performing carrier aggregation. Accordingly, downlink control information for the TDD SCell may also be configured and transmitted in an FDD type DCI format.
- the downlink control information format for the FDD SCell may be configured and transmitted in a TDD type DCI format.
- the downlink control information format for the scheduled cell may be determined according to the duplex mode of the scheduling cell (or PCell).
- the base station transmits the downlink control information to the terminal using the downlink control information format determined according to the duplex mode of the PCell (S1020).
- the downlink control information format transmitted by the base station may be determined by the duplex mode of the primary cell (PCell) as described above.
- PCell primary cell
- the downlink control information format for the TDD SCell is also configured in the FDD type DCI format and does not include a downlink assignment index (DAI) and indicates the HARQ process number.
- DCI downlink assignment index
- the information area may consist of three bits.
- the downlink control information format for the FDD SCell is also configured in a TDD type DCI format, which includes a 2-bit DAI and indicates an HARQ process number.
- the information area may consist of 4 bits.
- the base station of the present invention may transmit downlink control information by configuring an information area of a downlink control information format for the scheduled cell according to the duplex mode of the PCell. Through this, it is possible to resolve the ambiguity of the downlink control information format in the aforementioned carrier aggregation situation or dual connectivity situation.
- FIG. 11 is a flowchart illustrating an operation of a terminal according to another embodiment of the present invention.
- a terminal In a method for receiving downlink control information, a terminal according to another embodiment of the present invention comprises configuring carrier aggregation using a plurality of cells having different duplex modes and cross-carrier scheduling between the plurality of cells. And receiving downlink control information through a downlink control information format configured based on the duplex mode of any one of the plurality of cells.
- the terminal of the present invention may configure carrier aggregation using a plurality of cells having different duplex modes (S1110). Similarly, the terminal may configure a dual connection with a plurality of base stations using a plurality of cells having different duplex modes.
- cross-carrier scheduling may be set between a plurality of cells that form carrier merge or dual connectivity (S1120).
- cross carrier scheduling means that a scheduling cell performs scheduling for a scheduled cell.
- it may mean that the PCell performs scheduling for the SCell.
- the terminal may receive downlink control information from the base station through the downlink control information format configured based on the duplex mode of one of the plurality of cells (S1130). For example, the terminal may receive downlink control information through a downlink control information format configured according to a duplex mode of a serving cell configured as a primary cell (PCell) among a plurality of cells.
- PCell primary cell
- the terminal may receive downlink control information for the TDD SCell through the FDD type DCI format. That is, the downlink control information format does not include a downlink assignment index (DAI) when the duplex mode of the PCell is FDD, and an information region indicating a HARQ process number may be configured with 3 bits. As another example, the downlink control information format may include 2 bits of DAI when the duplex mode of the PCell is TDD, and an information area indicating a HARQ process number may be configured with 4 bits.
- DAI downlink assignment index
- the downlink control information format may include 2 bits of DAI when the duplex mode of the PCell is TDD, and an information area indicating a HARQ process number may be configured with 4 bits.
- the base station may configure the downlink control information format for the SCell or the scheduled cell based on the duplex mode of the PCell.
- the method of the present invention is based on a frame structure of a scheduled cell in which cross-carrier scheduling is configured. This is how you define it to be determined.
- cross-carrier scheduling is configured for an FDD serving cell so that resource allocation control information (DL assignment DCI or UL grant DCI) for a data channel (PDSCH or PUSCH) in the corresponding FDD serving cell.
- resource allocation control information DL assignment DCI or UL grant DCI
- PDSCH or PUSCH data channel
- the scheduling control information for the corresponding FDD serving cell may be defined to use the FDD type DCI format.
- cross-carrier scheduling is configured for an arbitrary TDD serving cell so that resource allocation control information (DL assignment DCI or UL grant DCI) for a data channel (PDSCH or PUSCH) in the corresponding TDD serving cell is FDD.
- resource allocation control information DL assignment DCI or UL grant DCI
- PDSCH or PUSCH data channel
- scheduling control information for a corresponding TDD serving cell may be defined to use a TDD type DCI format.
- the third embodiment may define a priority in the DCI format type and define a DCI format type to be used according to the frame structure of the scheduling cell and the scheduled cell based on the priority. As an example of this, it may be defined to give priority to the FDD type DCI format.
- cross-carrier scheduling is set for an FDD serving cell so that resource allocation control information (DL assignment DCI or UL grant DCI) for a data channel (PDSCH or PUSCH) in the corresponding FDD serving cell is set.
- resource allocation control information DL assignment DCI or UL grant DCI
- PDSCH or PUSCH data channel
- scheduling control information for the corresponding FDD serving cell may be defined to use an FDD type DCI format.
- cross-carrier scheduling is configured for an arbitrary TDD serving cell so that resource allocation control information (DL assignment DCI or UL grant DCI) for a data channel (PDSCH or PUSCH) in the corresponding TDD serving cell is established.
- resource allocation control information DL assignment DCI or UL grant DCI
- PDSCH or PUSCH data channel
- scheduling control information for the TDD serving cell may be defined to use an FDD type DCI format.
- it may be defined to give priority to the TDD type DCI format.
- cross-carrier scheduling is set for an FDD serving cell so that resource allocation control information (DL assignment DCI or UL grant DCI) for a data channel (PDSCH or PUSCH) in the corresponding FDD serving cell is set.
- resource allocation control information DL assignment DCI or UL grant DCI
- PDSCH or PUSCH data channel
- the scheduling control information for the corresponding FDD serving cell may be defined to use a TDD type DCI format.
- cross-carrier scheduling is configured for any TDD serving cell so that resource allocation control information (DL assignment DCI or UL grant DCI) for a data channel (PDSCH or PUSCH) in the corresponding TDD serving cell is set.
- resource allocation control information DL assignment DCI or UL grant DCI
- PDSCH or PUSCH data channel
- scheduling control information for a TDD serving cell may be defined to use a TDD type DCI format.
- cross-carrier scheduling is configured in a CA situation between an FDD serving cell and a TDD serving cell
- another method of defining a DCI format type to be used is used when setting a corresponding cross-carrier scheduling.
- the DCI format type may be set together to define signaling to the UE.
- FIG. 12 is a diagram illustrating an information element for designating a DCI format according to another embodiment of the present invention.
- a DCI format type configuration parameter may be defined in RRC signaling for configuring cross-carrier scheduling described above and included in RRC signaling as shown in FIG. 12.
- RRC signaling has been described as an example of higher layer signaling and may also transmit corresponding configuration information through other higher layer signaling.
- a DCIformatType information element may be added to cross carrier scheduling configuration information.
- the DCIformatType information element may include information indicating an FDD or TDD type. That is, the DCI format type to be used for PDSCH or PUSCH resource allocation of the scheduled cell in the corresponding scheduling cell may be set and transmitted according to whether the RRC parameter defined by DCIformatType is set.
- FIG. 13 is a view showing the configuration of a base station according to another embodiment of the present invention.
- the base station 1300 includes a control unit 1310, a transmitter 1320, and a receiver 1330.
- the base station 1300 for transmitting the downlink control information of the present invention is a control unit 1310 for configuring the downlink control information format based on the duplex mode of any one of a plurality of cells configured in the terminal performing carrier aggregation And a transmitter 1320 for transmitting downlink control information using a downlink control information format.
- the terminal receiving the downlink control information may configure carrier aggregation into a plurality of cells having different duplex modes and perform cross-carrier scheduling.
- the control unit 1310 controls the overall operation of the base station according to defining the DCI format to be used for downlink control information transmission required to perform the above-described present invention. Accordingly, the controller 1310 may configure a downlink control information format by dividing according to the duplex mode of the primary cell (PCell) of the terminal performing carrier aggregation.
- PCell primary cell
- the controller 1310 may include a downlink assignment index (DAI) and configure a downlink control information format with 3 bits of an information region indicating a HARQ process number. have.
- DAI downlink assignment index
- control unit 1310 may include a 2-bit DAI when the duplex mode of the primary cell is TDD, and configure the downlink control information format with an 4-bit information region indicating the HARQ process number.
- the transmitter 1320 may transmit downlink control information using the downlink control information format configured in the above-described method.
- the transmitter 1320 and the receiver 1330 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
- controller 1310 may perform an operation required to perform the operations of the above-described second to fourth embodiments.
- FIG. 14 is a view showing the configuration of a user terminal according to another embodiment of the present invention.
- a user terminal 1400 includes a receiver 1430, a controller 1410, and a transmitter 1420.
- the UE 1400 configures carrier aggregation by using a plurality of cells having different duplex modes, and controls 1410 and a plurality of cells in which cross-carrier scheduling is set between the plurality of cells.
- the receiver 1430 may receive downlink control information through a downlink control information format configured based on a duplex mode of any one of the cells.
- the controller 1410 may configure carrier aggregation using a plurality of cells, configure dual connectivity, and perform cross carrier scheduling.
- the receiver 1430 may receive downlink control information configured based on the duplex mode of any one of the plurality of cells from the base station, and additionally receive data and messages through the corresponding channel.
- the downlink control information format received by the UE may be configured according to the duplex mode of the primary cell (PCell).
- the downlink control information format may not include a downlink assignment index (DAI) when the duplex mode of the primary cell is FDD, and an information region indicating a HARQ process number may be configured with 3 bits.
- DAI downlink assignment index
- the downlink control information format may include 2 bits of DAI when the duplex mode of the primary cell is TDD, and an information region indicating a HARQ process number may be configured with 4 bits.
- controller 1410 may perform all the operations required to perform the above-described embodiments of the present invention.
- the transmitter 1420 transmits uplink control information, data, and a message to a base station through a corresponding channel.
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Abstract
Description
Claims (18)
- 기지국이 하향링크 제어정보를 전송하는 방법에 있어서,캐리어 병합을 수행하는 단말에 구성된 복수의 셀 중 어느 하나의 셀의 듀플렉스 모드에 기초하여 하향링크 제어정보 포맷을 구성하는 단계; 및상기 하향링크 제어정보 포맷을 이용하여 상기 하향링크 제어정보를 전송하는 단계를 포함하는 방법.
- 제 1 항에 있어서,상기 단말은,서로 다른 듀플렉스 모드를 갖는 복수의 셀로 상기 캐리어 병합을 구성하며, 크로스 캐리어 스케줄링을 수행하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서,상기 하향링크 제어정보 포맷은,상기 캐리어 병합을 수행하는 단말의 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드에 따라서 구분되어 구성되는 것을 특징으로 하는 방법.
- 제 3 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 FDD인 경우에 DAI(Downlink Assignment Index)를 포함하지 않고, HARQ 프로세스 넘버를 지시하는 정보 영역이 3비트로 구성되는 것을 특징으로 하는 방법.
- 제 3 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 TDD인 경우에 2비트의 DAI(Downlink Assignment Index)를 포함하고, HARQ 프로세스 넘버를 지시하는 정보 영역이 4비트로 구성되는 것을 특징으로 하는 방법.
- 단말이 하향링크 제어정보를 수신하는 방법에 있어서,서로 다른 듀플렉스 모드를 갖는 복수의 셀을 이용하여 캐리어 병합을 구성하는 단계;상기 복수의 셀 간에 크로스 캐리어 스케줄링이 설정되는 단계; 및상기 복수의 셀 중 어느 하나의 셀의 듀플렉스 모드에 기초하여 구성된 하향링크 제어정보 포맷을 통해서 하향링크 제어정보를 수신하는 단계를 포함하는 방법.
- 제 6 항에 있어서,상기 하향링크 제어정보 포맷은,프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드에 따라서 구분되어 구성되는 것을 특징으로 하는 방법.
- 제 7 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 FDD인 경우에 DAI(Downlink Assignment Index)를 포함하지 않고, HARQ 프로세스 넘버를 지시하는 정보 영역이 3비트로 구성되는 것을 특징으로 하는 방법.
- 제 7 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 TDD인 경우에 2비트의 DAI(Downlink Assignment Index)를 포함하고, HARQ 프로세스 넘버를 지시하는 정보 영역이 4비트로 구성되는 것을 특징으로 하는 방법.
- 하향링크 제어정보를 전송하는 기지국에 있어서,캐리어 병합을 수행하는 단말에 구성된 복수의 셀 중 어느 하나의 셀의 듀플렉스 모드에 기초하여 하향링크 제어정보 포맷을 구성하는 제어부; 및상기 하향링크 제어정보 포맷을 이용하여 상기 하향링크 제어정보를 전송하는 송신부를 포함하는 기지국.
- 제 10 항에 있어서,상기 단말은,서로 다른 듀플렉스 모드를 갖는 복수의 셀로 상기 캐리어 병합을 구성하며, 크로스 캐리어 스케줄링을 수행하는 것을 특징으로 하는 기지국.
- 제 10 항에 있어서,상기 하향링크 제어정보 포맷은,상기 캐리어 병합을 수행하는 단말의 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드에 따라서 구분되어 구성되는 것을 특징으로 하는 기지국.
- 제 12 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 FDD인 경우에 DAI(Downlink Assignment Index)를 포함하지 않고, HARQ 프로세스 넘버를 지시하는 정보 영역이 3비트로 구성되는 것을 특징으로 하는 기지국.
- 제 12 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 TDD인 경우에 2비트의 DAI(Downlink Assignment Index)를 포함하고, HARQ 프로세스 넘버를 지시하는 정보 영역이 4비트로 구성되는 것을 특징으로 하는 기지국.
- 하향링크 제어정보를 수신하는 단말에 있어서,서로 다른 듀플렉스 모드를 갖는 복수의 셀을 이용하여 캐리어 병합을 구성하고, 상기 복수의 셀 간에 크로스 캐리어 스케줄링이 설정되는 제어부; 및상기 복수의 셀 중 어느 하나의 셀의 듀플렉스 모드에 기초하여 구성된 하향링크 제어정보 포맷을 통해서 하향링크 제어정보를 수신하는 수신부를 포함하는 단말.
- 제 15 항에 있어서,상기 하향링크 제어정보 포맷은,프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드에 따라서 구분되어 구성되는 것을 특징으로 하는 단말.
- 제 16 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 FDD인 경우에 DAI(Downlink Assignment Index)를 포함하지 않고, HARQ 프로세스 넘버를 지시하는 정보 영역이 3비트로 구성되는 것을 특징으로 하는 단말.
- 제 16 항에 있어서,상기 하향링크 제어정보 포맷은,상기 프라이머리 셀(Primary Cell, PCell)의 듀플렉스 모드가 TDD인 경우에 2비트의 DAI(Downlink Assignment Index)를 포함하고, HARQ 프로세스 넘버를 지시하는 정보 영역이 4비트로 구성되는 것을 특징으로 하는 단말.
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