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WO2014171754A1 - Procédé et appareil permettant la transmission et la réception d'informations de commande en liaison descendante - Google Patents

Procédé et appareil permettant la transmission et la réception d'informations de commande en liaison descendante Download PDF

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Publication number
WO2014171754A1
WO2014171754A1 PCT/KR2014/003338 KR2014003338W WO2014171754A1 WO 2014171754 A1 WO2014171754 A1 WO 2014171754A1 KR 2014003338 W KR2014003338 W KR 2014003338W WO 2014171754 A1 WO2014171754 A1 WO 2014171754A1
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Prior art keywords
harq
control information
pdschs
harq process
process number
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English (en)
Korean (ko)
Inventor
박규진
최우진
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KT Corp
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KT Corp
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Priority claimed from KR1020130132159A external-priority patent/KR101886451B1/ko
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    • 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
    • H04L5/0055—Physical resource allocation for ACK/NACK

Definitions

  • the present invention relates to a method and apparatus for transmitting and receiving downlink control information including multiple subframe scheduling information and control information related to retransmission of a plurality of data channels.
  • LTE Long Term Evolution
  • LTE-Advanced of the current 3GPP series are high-speed and large-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.
  • An object of the present invention is to provide a method and apparatus for a terminal to perform multiple subframe scheduling, multiple TTI scheduling or cross subframe scheduling according to an indication of a base station.
  • the present invention also provides a method and apparatus for resolving ambiguity of a retransmission procedure for a data channel when a terminal belonging to a small cell environment or a cell / base station / RRH / antenna / RU is configured for multiple subframes.
  • the purpose is.
  • a method for transmitting downlink control information by a base station includes K physical transmitted on K consecutive downlink subframes (K is a natural number greater than 2). Transmitting downlink control information including multiple subframe scheduling information for scheduling a downlink data channel (hereinafter referred to as 'PDSCH') and control information related to HARQ of the K PDSCHs to a user equipment through a control channel Transmitting K PDSCHs to the UE in each of the K downlink subframes according to the multi-subframe scheduling information; And receiving HARQ ACK / NACK for K PDSCHs from the terminal.
  • K is a natural number greater than 2
  • a method for receiving downlink control information by a terminal includes K physical transmissions transmitted in downlink subframes of K consecutive or discontinuous K (K is a natural number greater than 2).
  • a base station is a K physical downlink data channel (Physical Downlink) transmitted in consecutive or discontinuous K downlink subframes (K is a natural number greater than 2)
  • K is a natural number greater than 2
  • Multi-subframe scheduling information for scheduling a shared channel (hereinafter, referred to as 'PDSCH') and downlink control information including HARQ-related control information of the K PDSCHs are transmitted to a UE through a control channel, and the multi-subframe scheduling is performed.
  • a UE may have K physical downlink data channels transmitted in K or DL downlink subframes (K is a natural number greater than 2). And receiving downlink control information including multiple subframe scheduling information for scheduling a shared channel (hereinafter referred to as 'PDSCH') and downlink control information including HARQ-related control information of the K PDSCHs from a base station through the control channel, and scheduling the multiple subframes. And a receiving unit for receiving K PDSCHs from the base station in each of the K downlink subframes according to information and HARQ-related control information, and a transmitting unit for transmitting HARQ ACK / NACK for the K PDSCHs to the base station.
  • a UE may perform multiple subframe scheduling, multiple TTI scheduling, or cross subframe scheduling according to an indication of a base station.
  • a UE belonging to a small cell environment or an arbitrary cell / base station / RRH / antenna / RU may have an effect of resolving ambiguity of a retransmission procedure for a data channel when multiple subframe scheduling is performed.
  • FIG. 1 is a diagram illustrating small cell deployment according to an embodiment.
  • FIG. 2 is a diagram illustrating a small cell deployment scenario.
  • FIG. 3 is a diagram illustrating a detailed scenario in small cell deployment.
  • FIG. 4 is a diagram of a control region for transmitting a downlink control channel.
  • FIG. 5 is a diagram illustrating transmission of a control region for transmitting a control channel in one subframe.
  • FIG. 6 is a diagram for explaining a concept of multi-subframe scheduling through PDCCH (a) / EPDCCH (b).
  • FIG. 7 is a diagram illustrating the operation of a base station according to an embodiment of the present invention.
  • FIG. 8 illustrates an operation of a terminal according to another embodiment.
  • FIG. 9 is a diagram illustrating a configuration of a base station according to another embodiment.
  • FIG. 10 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • 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.
  • the user terminal may be abbreviated as a terminal.
  • a user terminal may be referred to as a terminal for short.
  • 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.
  • Base Transceiver System Access Point, Relay Node, Remote Radio Head, RRH, Radio Unit, Transmission Point, TP, Reception Point, RP, etc. It may be called in other terms.
  • a base station or a cell is interpreted in a comprehensive sense to indicate 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 is meant to cover various coverage areas such as mega cell, macro cell, micro cell, pico cell, femto cell and relay node, RRH, RU 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 eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, etc. become embodiments of the base station according to the configuration of the radio region.
  • 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 a neighboring base station.
  • megacells macrocells, microcells, picocells, femtocells, small cells, RRHs, antennas, RUs, low power nodes (LPNs), points, eNBs, transmission / reception points, transmission points, and reception points are collectively referred to as base stations. do.
  • LPNs low power nodes
  • 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
  • Uplink and downlink transmit control information through control channels such as Physical Downlink Control CHannel (PDCCH), Physical Control Format Indicator CHannel (PCFICH), Physical Hybrid ARQ Indicator CHannel (PHICH), and Physical Uplink Control CHannel (PUCCH).
  • a data channel is configured such as PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel) and the like to transmit data.
  • control information may also be transmitted using an enhanced PDCCH or an extended PDCCH (EPDCCH).
  • 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, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.
  • transmitting or receiving a PDCCH or transmitting or receiving a signal through a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.
  • the physical downlink control channel described below may mean a PDCCH or an EPDCCH, and may also be used to include both PDCCH and EPDCCH.
  • the PDCCH which is an embodiment of the present invention, may be applied to the portion described as the PDCCH.
  • high layer signaling described in the present specification includes RRC signaling for transmitting RRC information including an RRC parameter.
  • An eNB which is an embodiment of a base station, performs downlink transmission to terminals.
  • the eNB includes downlink control information and an uplink data channel (eg, a physical downlink shared channel (PDSCH), which is a main physical channel for unicast transmission, and scheduling required for receiving the PDSCH.
  • a physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission on a physical uplink shared channel (PUSCH) may be transmitted.
  • PUSCH physical uplink shared channel
  • the first terminal UE1 may transmit an uplink signal to the eNB and the second terminal may transmit an uplink signal to the RRH.
  • FIG. 1 is a diagram illustrating small cell deployment according to an embodiment.
  • FIG. 1 illustrates a configuration in which a small cell and a macro cell coexist, and in FIGS. 2 to 3 below, whether macro coverage is present and whether the small cell is for outdoor or indoor.
  • the deployment of the small cell is divided in more detail according to whether or not to use the same frequency spectrum as the macro in terms of spectrum.
  • FIG. 2 is a diagram illustrating a small cell deployment scenario.
  • FIG. 2 shows a typical representative configuration for the scenario of FIG. 3.
  • 2 illustrates a small cell deployment scenario and includes scenarios # 1, # 2a, # 2b and # 3.
  • 200 denotes a macro cell
  • 210 and 220 denote small cells.
  • the overlapping macro cell may or may not exist.
  • Coordination may be performed between the macro cell 200 and the small cells 210 and 220, and coordination may also be performed between the small cells 210 and 220.
  • the overlapped areas of 200, 210, and 220 may be bundled into clusters.
  • FIG. 3 is a diagram illustrating a detailed scenario in small cell deployment.
  • the solid lines connecting the small cells in the small cells 312, 322, 332, and 342 refer to backhaul link within clusters.
  • the dotted lines connecting the base station of the macro cell and the small cells in the cluster mean a backhaul link between the small cell and the macro cell.
  • Scenario 1 is a co-channel deployment scenario of a small cell and a macro cell in the presence of an overhead macro and an outdoor small cell scenario.
  • 310 denotes a case where both the macro cell 311 and the small cell are outdoors, and 312 indicates a small cell cluster. Users are distributed both indoors and outdoors.
  • Scenario 2a is an deployment scenario in which the small cell and the macro use different frequency spectrums in the presence of an overlay macro and an outdoor small cell scenario. Both macro cell 321 and small cells are outdoors and 322 indicates a small cell cluster. Users are distributed both indoors and outdoors.
  • Scenario 2b is a deployment scenario in which the small cell and the macro use different frequency spectrums in the presence of an overlay macro and an indoor small cell scenario.
  • Macro cell 331 is outdoors, small cells are all indoors, and 332 denotes a small cell cluster. Users are distributed both indoors and outdoors.
  • Scenario 3 is an indoor small cell scenario in the absence of coverage of macros.
  • 342 indicates a small cell cluster.
  • small cells are all indoors, and users are distributed both indoors and outdoors.
  • FIG. 4 is a diagram of a control region for transmitting a downlink control channel.
  • the control region 410 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. 5 is a diagram illustrating transmission of a control region for transmitting a control channel in one subframe.
  • 510 and 520 are examples of transmission of a PDSCH indicated by a control channel transmitted in every subframe when the PDSCH is transmitted on multiple carriers.
  • CC # 1, # 2 and # 3 of 510 and 520 mean a 1st component carrier, a 2nd component carrier, and a 3rd component carrier, respectively.
  • 5 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
  • 510 is an embodiment without cross carrier scheduling (No cross-carrier scheduling).
  • the carrier indicator is not included in the downlink control information (DCI).
  • self-carrier scheduling is performed on multiple carriers, and a PDCCH exists in each carrier independently in each carrier to schedule a corresponding PDSCH.
  • This is a data transmission in each carrier by the control channel transmitted in every subframe within the 1ms subframe.
  • 520 indicates cross carrier scheduling on multiple carriers and includes a carrier indicator in downlink control information.
  • 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.
  • Table 1 is a DCI format indicating a scheduling grant for uplink / downlink transmission. DCI formats are separately transmitted according to each uplink / downlink transmission method and usage.
  • scheduling information about a downlink data channel (PDSCH) received by a UE belonging to a cell / base station / RRH / antenna / RU or small cell and an uplink data channel (PUSCH) that the UE should transmit is downlinked. It is transmitted through PDCCH / EPDCCH, which is a physical control channel transmitted through a link subframe.
  • PDCCH / EPDCCH which is a physical control channel transmitted through a link subframe.
  • PDSCH resource allocation information for any UE in any downlink subframe is always transmitted to the UE through the downlink PDCCH of the corresponding subframe.
  • a terminal belonging to a small cell often has low mobility, and thus, a radio channel state change with a base station is not likely to be severe with time compared to a terminal belonging to a conventional macro cell.
  • downlink scheduling information for PDSCH transmission such as Modulation Coding Scheme (MCS) and frequency resource allocation.
  • MCS Modulation Coding Scheme
  • the PUSCH or the plurality of downlink subframes for the plurality of uplink subframes are transmitted through downlink scheduling information (Assignment information) transmitted through one PDCCH or EPDCCH.
  • Downlink / downlink multiple sub-frame scheduling, multiple transmission time interval scheduling or cross sub-frame scheduling has been proposed.
  • the PDSCH having the same structure as the PDSCH scheduling information of the downlink subframe in which downlink scheduling information for transmitting the PDSCH of the UE is transmitted through a PDCCH or an EPDCCH is followed by a downlink subframe. It may be transmitted to the terminal through. That is, a plurality of PDSCH assignments using the same MCS in the same frequency resource may be performed according to downlink control information transmitted through one PDCCH or EPDCCH according to multiple subframe scheduling units. For example, when a multi-subframe scheduling unit is composed of two consecutive subframes, as shown in FIG.
  • the multi-subframe scheduling unit is continuous through one downlink control information including downlink scheduling information transmitted through PDCCH or EPDCCH.
  • PDSCH resource allocation may be performed in two downlink subframes. To distinguish the two PDSCHs, a PDSCH of the first downlink subframe is referred to as PDSCH # 1, and a PDSCH of the second downlink subframe is referred to as PDSCH # 2.
  • FIG. 6 is a diagram for explaining the concept of multiple subframe scheduling (downlink case) through PDCCH (a) / EPDCCH (b).
  • PDSCH # 1 and PDSCH # 2 have the same MCS and HARQ process numbers as well as frequency resource allocation information through PDCCH (a) / EPDCCH (b).
  • HARQ retransmission for the downlink data channel operates in an asynchronous adaptive manner.
  • PDSCH resource allocation information for retransmission is transmitted to the UE through PDCCH / EPDCCH, and the UE determines whether the corresponding PDSCH resource is retransmission for the previous PDSCH transmission or new data. Whether it is the initial transmission for the HARQ process number (HARQ process number) and the NDI (New Data Indicator, NDI) fields are distinguished.
  • HARQ process number HARQ process number
  • NDI New Data Indicator
  • the present invention provides a method for transmitting uplink / downlink scheduling information of a UE belonging to an arbitrary cell / base station / eNB / RRH / RU in a small cell environment, and transmits and receives data channel transmission / reception resources of a plurality of subframes through one downlink control information.
  • a method of allocating HARQ-related downlink control information HARQ process number for a case where multiple subframe scheduling is applied, an uplink ACK / NACK feedback method, and an apparatus thereof are provided.
  • Existing LTE / LTE-Advanced Rel-11 or lower system supports a method of operating a plurality of HARQ processes in parallel as a method for increasing the data transmission speed between the base station and the terminal.
  • the HARQ protocol is based on multiple parallel processes.
  • the receiver Upon receiving a transport block for a particular HARQ process, the receiver attempts to decode the transport block and informs the transmitter whether the transport block was successfully decoded through the HARQ ACK.
  • the downlink data transmission supports a specific number, for example, eight HARQ processes.
  • the HARQ process number is transmitted to the UE through a downlink allocation DCI format for PDSCH resource allocation.
  • the downlink allocation DCI format includes an NDI (New Data Indicator) field as an indicator information region for distinguishing whether initial transmission or retransmission of new data is performed for each HARQ process.
  • the NDI field may be changed to 0 for initial transmission and 1 for retransmission, for example, in 1 bit.
  • the UE may determine whether the PDSCH is retransmission or initial transmission for data of the HARQ process by checking the HARQ process number and the NDI of the PDSCH.
  • the UE when receiving the downlink scheduling allocation information, the UE checks the NDI and whether the current transmission should be soft combined with the received data stored in the soft buffer of the corresponding HARQ process or should the soft buffer be empty.
  • the downlink allocation DCI format may include a redundancy version (for example, 2 bits) together with the HARQ process number and the NDI of the PDSCH.
  • the redundancy version points to different starting points for extracting the coded bits from the circular buffer.
  • the outputs of the system encoder (system bits, first parity bits, second parity bits) are first interleaved respectively. Interleaved bits enter the circular buffer. At this time, the system (system bits are entered first and the first parity bit and the second parity bit are alternated once.
  • the bit selection block extracts the contiguous bits from the circular buffer by the allocated resource. The bits extracted are dependent on the redundancy version.
  • the base station explicitly signals HARQ-related downlink control information including the HARQ process number, the NDI, and the redundancy version of the corresponding PDSCH in each downlink allocation information.
  • the present invention provides a method for transmitting HARQ-related downlink control information for each PDSCH, a HARQ ACK / NACK feedback method, and an apparatus thereof according to each PDSCH.
  • the downlink allocation DCI format transmits a HARQ process number consisting of 3 bits in FDD and 4 bits in TDD together with PDSCH transmission resource allocation information to the UE.
  • a HARQ process number consisting of 3 bits in FDD and 4 bits in TDD together with PDSCH transmission resource allocation information to the UE.
  • the FDD that is, the HARQ process number is configured with 3 bits
  • the same concept may be applied to the TDD.
  • Embodiment 1 Implicit HARQ Process Number Allocation with Separate ACK / NACK Feedback
  • the base station transmits to the terminal only single HARQ-related control information (specifically, a single HARQ process number) together with a single PDSCH resource allocation information through corresponding downlink control information.
  • HARQ-related control information specifically, a single HARQ process number
  • the UE implicitly infers the HARQ process number for the subsequent PDSCH transmitted through the subsequent downlink subframe based on the HARQ process number transmitted through the corresponding downlink control information.
  • an incremental HARQ process number allocation scheme may be used. That is, as shown in FIG. 6, when one PDSCH resource of two downlink subframes is allocated through one downlink control information, that is, when a unit of multiple subframe scheduling is 2 subframes, one downlink Two PDSCH resources are allocated through the link control information.
  • the corresponding downlink control information transmits only one HARQ-related control information (specifically, HARQ process number) to the UE, and the corresponding HARQ process number is used as a HARQ process number for PDSCH # 1 transmission, which is the first PDSCH.
  • the HARQ process number for PDSCH # 2 in the subframe may be determined to be the HARQ process number + 1 of the corresponding PDSCH # 1. However, at this time, if the HARQ process number of PDSCH # 1 is maximum, the HARQ process number # 0 is cyclically allocated again.
  • k PDSCH resource allocations are simultaneously made through k subframes (k is a natural number larger than 1 or 2) through one downlink control information (for explanation, PDSCH indexes PDSCH # 1 to PDSCH #K according to the transmitted subframe order), and HARQ process number transmitted through the corresponding downlink control information is #m, the following equation for the corresponding PDSCH HARQ process number can be assigned by 1.
  • the modular 8 operation is performed in Equation 1 because the number of HARQ processes is 8, and when the number of HARQ processors is x, the modular x operation is performed.
  • the corresponding UE transmits independent HARQ ACK / NACK feedback (1 bit or 2 bits) to each BS for each PDSCH.
  • the UE implicitly infers the HARQ process number for the subsequent PDSCH transmitted through the subsequent downlink subframe according to Equation 1 based on the HARQ process number transmitted through the downlink control information.
  • the UE may determine whether the PDSCH is retransmission or initial transmission for data of the HARQ process by checking the HARQ process number and the NDI of the PDSCH.
  • the UE checks the NDI and whether the current downlink transmission should be soft combined with the received data stored in the soft buffer of the corresponding HARQ process, or the soft buffer is empty. Decide if you should.
  • the terminal acquires interleaved system bits, first parity bits, and second parity bits from the received data using the redundancy version.
  • the first PDSCH # 1 to use the HARQ process number transmitted through the downlink control information, and subsequent PDSCHs are not currently in use, that is,
  • the HARQ process numbers among the HARQ process numbers for which PDSCH transmission is completed may be allocated in order from the smallest HARQ process numbers. Even in this case, the corresponding UE transmits independent HARQ ACK / NACK feedback (1 bit or 2 bits) to each BS for each PDSCH.
  • the base station may directly allocate a separate HARQ process number for each PDSCH through the corresponding downlink control information.
  • HARQ-related control information includes each HARQ process number and NDI, redundancy version for the K PDSCH.
  • the corresponding DL allocation DCI format is used for each HARQ process number, NDI, and redundancy version for K PDSCHs transmitted for each subframe together with PDSCH resource allocation information.
  • Each of the HARQ related control information may be included.
  • the new downlink control information for the corresponding multi-subframe downlink allocation is added to K PDSCHs according to Equation 2 together with common PDSCH scheduling information (for example, MCS, resource block assignment, etc.).
  • HARQ process number for each and may include HARQ-related control information, including NDI, redundancy version.
  • the corresponding UE transmits independent HARQ ACK / NACK feedback to each base station for each PDSCH.
  • the UE provides downlink control information of the DCI format including HARQ process number and HARQ-related control information for each HARQ process number and NDI and redundancy version for K PDSCHs transmitted for each subframe together with downlink multiple scheduling allocation information.
  • the UE may determine whether the PDSCH is retransmission or initial transmission for data of the HARQ process by checking the HARQ process number and the NDI of the PDSCH.
  • the UE checks the NDI and whether the current downlink transmission should be soft combined with the received data stored in the soft buffer of the corresponding HARQ process, or the soft buffer is empty. Decide if you should.
  • the terminal acquires interleaved system bits, first parity bits, and second parity bits from the received data using the redundancy version.
  • the UE is based on a downlink subframe in which the last PDSCH reception is performed through multi-subframe scheduling. After 4 subframes in the case of FDD, an uplink subframe in the case of TDD or a downlink subframe in which the last PDSCH is received in the case of TDD.
  • the corresponding HARQ ACK / NACK may be fed back for each codeword through a corresponding uplink subframe.
  • the base station allocates a single HARQ process number to a plurality of PDSCHs allocated through corresponding downlink control information, and independently schedules NDI and redundancy versions for each PDSCH. can do.
  • the HARQ related control information includes a common HARQ process number and respective NDI and redundancy versions for K PDSCHs.
  • the corresponding DL allocation DCI format includes information on each NDI and redundancy version for K PDSCHs transmitted for each subframe together with PDSCH resource allocation information. You can do that. That is, new downlink control information for the corresponding multi-subframe downlink allocation is K according to Equation 3 together with common PDSCH scheduling information (eg, MCS, resource block assignment, etc.) and a common HARQ process number. HARQ-related control information including respective NDI and redundancy versions for each PDSCH may be included.
  • common PDSCH scheduling information eg, MCS, resource block assignment, etc.
  • the HARQ process number may be assigned an HARQ process number to be sequentially incremented from the first PDSCH. That is, the HARQ process number for the Kth PDSCH allocated through the downlink control information in the form as shown in Equation 1 is allocated, and only the NDI and redundancy versions for each PDSCH are specified through the downlink control information. Can be assigned as
  • the HARQ related control information may include a common HARQ process number, a common redundancy version, and each NDI for K PDSCHs.
  • the downlink allocation DCI format including the HARQ-related control information may be defined to include a separate NDI information region for K PDSCHs transmitted for each subframe. That is, the downlink allocation DCI format applies a single HARQ process number and a redundancy version to K PDSCHs, and defines a separate NDI for each PDSCH, so that the UE has each K number through one HARQ process number. It is possible to independently manage the HARQ procedure for PDSCH transmission.
  • the UE transmits independent HARQ ACK / NACK feedback to each BS for each PDSCH.
  • Embodiment 4 Single HARQ Process Number Allocation with Single ACK / NACK Feedback
  • Embodiment 4 may allow PDSCHs allocated through corresponding multiple subframe scheduling to be integratedly managed through one HARQ process.
  • the HARQ-related control information includes a single HARQ process number for K PDSCHs, includes one NDI and a redundant version in the case of single layer transmission, and the codeword in case of multi-layer transmission.
  • the HARQ-related control information may include the same information area as the existing DCI format and may include a single HARQ process number.
  • the HARQ-related control information may include one NDI and a redundant version, respectively.
  • the HARQ-related control information may include one or two NDI and redundant versions according to the number of codewords.
  • the terminal may be fed back one or two ACK / NACK for each codeword.
  • 4 subframes in the case of FDD correspond to an uplink subframe in the case of TDD or a downlink subframe in which the last PDSCH is received in the case of TDD.
  • a corresponding HARQ ACK / NACK feedback may be defined for each codeword through an uplink subframe.
  • FIG. 7 is a diagram illustrating the operation of a base station according to an embodiment of the present invention.
  • the base station transmits downlink control information including multiple subframe scheduling information and HARQ-related control information to a terminal through a control channel ( S710).
  • the base station is multi-subframe scheduling information for scheduling K PDSCH transmitted in K consecutive (non-consecutive) K (K is a natural number greater than 2) and HARQ-related control information of K PDSCH Downlink control information including a may be transmitted to the terminal through a control channel.
  • the base station In order to transmit the multiple subframe scheduling information for scheduling the K PDSCH, the base station generates a downlink control channel including the indication information signaling the type of scheduling, and the downlink control channel generated to the terminal to the downlink signal You can send it.
  • the indication information indicates any one of multiple TTI, multiple subframe scheduling, and cross subframe scheduling.
  • the base station includes the indication information having a size of 1 bit or more in the DCI format when generating a downlink signal.
  • DCI format 0 or DCI format 1a is included in the dedicated search space of the terminal so that the terminal can search in the dedicated search space.
  • detailed information may be included through RRC.
  • the base station includes one or more bits of indication information in downlink control information when generating downlink, and includes multi-TTI, multi-subframe scheduling, or cross-subframe in the downlink signal.
  • a radio resource control (RRC) parameter including information necessary to set one of the scheduling may be included.
  • the base station In order to indicate the number of subframes, the base station generates indication information or the RRC parameter included in the downlink signal indicates information indicating the number of subframes required for multi-TTI, multi-subframe scheduling or cross-subframe scheduling. It may include.
  • the indication information is multi-TTI, multi-subframe based on the range of the number of subframes included in the downlink signal or included in the RRC parameter of the downlink signal transmitted before transmission of the downlink signal to indicate the hybrid method
  • a downlink signal indicating the number of subframes required for scheduling or cross subframe scheduling may be generated.
  • the base station may include the indication information in the frequency hopping flag when frequency hopping in the uplink signal is inactivated when generating the downlink signal.
  • the indication information may be included in the.
  • the base station may generate a downlink signal such that any one of 5, 6, and 7 of the CIF field becomes indication information.
  • the base station downlinks the downlink signal such that the indication information or a second indication distinguished from the indication information includes continuation information of a plurality of subframes in multi-TTI, multi-subframe scheduling or cross-subframe scheduling.
  • the link signal may be generated and in another manner, the indication information or the second indication information may use a code point on a DCI format or a code point of a CIF.
  • the base station transmits HARQ-related control information of the K PDSCH to the terminal through the control channel.
  • the HARQ-related control information may include a HARQ process number, a new-data indicator (NDI), and a redundancy version for K PDSCHs.
  • HARQ-related control information may include a single HARQ process number for the K PDSCH.
  • the HARQ process number for the PDSCH of the subframe in which the HARQ related control information is transmitted is used for the single HARQ process number, and the HARQ process number for the Kth PDSCH of the Kth subframe indexed in sequence is (the single HARQ process number).
  • + K-1 may be used by modular x (x is the number of HARQ processes).
  • the HARQ process number for the PDSCH of the subframe in which HARQ-related control information is transmitted is used for the single HARQ process number, and the HARQ process number for subsequent PDSCHs is the smallest among the HARQ process numbers that are not currently in use. It may be used in turn from HARQ process numbers.
  • the base station may be assigned a HARQ process number in a manner similar to the first embodiment so that the HARQ process number increases sequentially from the first PDSCH.
  • the HARQ process number is allocated to the Kth PDSCH allocated through the downlink control information in the form as described in Equation 1 above, and only the NDI and redundancy versions for each PDSCH are provided through the downlink control information. Can be assigned explicitly.
  • the HARQ-related control information may include respective HARQ process numbers, NDIs, and redundancy versions for the K PDSCHs.
  • the HARQ related control information may include a common HARQ process number and respective NDI and redundancy versions for K PDSCHs.
  • the HARQ-related control information includes a single HARQ process number for the K PDSCHs, and includes one NDI and a redundancy version in the case of a single layer transmission.
  • one or two NDI and redundant versions may be included according to the number of codewords.
  • the base station transmits K PDSCHs to the terminal (S720).
  • the base station may transmit K PDSCHs to K terminals in each of the K downlink subframes according to the multi-subframe scheduling information.
  • the K downlink subframes may be K consecutive downlink subframes (K is a natural number greater than 2).
  • the base station may transmit K PDSCHs in each of K consecutive downlink subframes (K is a natural number greater than 2).
  • the base station receives HARQ ACK / NACK for the K PDSCH from the terminal (S730).
  • FIG. 8 illustrates an operation of a terminal according to another embodiment.
  • the terminal receives downlink control information including multiple subframe scheduling information and HARQ-related control information from a base station through a control channel ( S810).
  • the UE is multi-subframe scheduling information for scheduling the K PDSCH transmitted in K or DL (K is a natural number greater than 2) downlink subframe and HARQ-related control information of the K PDSCH Downlink control information including a may be received from the base station through the control channel.
  • the terminal receives the HARQ-related control information of the K PDSCH from the base station through the control channel.
  • the HARQ-related control information may include a HARQ process number, a new-data indicator (NDI), and a redundancy version for K PDSCHs.
  • the HARQ related control information may include a single HARQ process number for K PDSCHs or may include respective HARQ process numbers for K PDSCHs.
  • the HARQ-related control information may include a single NDI and redundancy version for K PDSCHs, or may include respective NDI and redundancy versions for K PDSCHs.
  • the terminal receives K PDSCHs from the base station (S820).
  • the UE may receive K PDSCHs from each of the K downlink subframes from the base station according to the multi-subframe scheduling information.
  • the K downlink subframes may be K consecutive downlink subframes (K is a natural number greater than 2).
  • the UE may receive K PDSCHs in each of K downlink subframes (K is a natural number greater than 2).
  • the terminal transmits HARQ ACK / NACK for the K PDSCH to the base station (S830).
  • the corresponding UE when different HARQ process numbers are implicitly allocated to respective PDSCHs as described above in the first embodiment, the corresponding UE provides independent HARQ ACK / NACK feedback (1 bit or 2 bits) for each PDSCH. Each transmission to the base station.
  • the HARQ process number may be allocated in a similar manner to Embodiment 1 so that the HARQ process number increases sequentially from the first PDSCH.
  • the HARQ process number for the Kth PDSCH allocated through the downlink control information in the form of Equation 1 described above is allocated, and only the NDI and redundancy versions for each PDSCH are provided through the downlink control information. Can be assigned explicitly.
  • the UE implicitly infers the HARQ process number for the subsequent PDSCH transmitted through the subsequent downlink subframe according to Equation 1 based on the HARQ process number transmitted through the downlink control information.
  • the UE may determine whether the PDSCH is retransmission or initial transmission for data of the HARQ process by checking the HARQ process number and the NDI of the PDSCH.
  • the UE checks the NDI and whether the current downlink transmission should be soft combined with the received data stored in the soft buffer of the corresponding HARQ process, or the soft buffer is empty. Decide if you should.
  • the terminal acquires interleaved system bits, first parity bits, and second parity bits from the received data using the redundancy version.
  • the first PDSCH # 1 to use the HARQ process number transmitted through the downlink control information, and subsequent PDSCHs are not currently in use, that is,
  • the HARQ process numbers among the HARQ process numbers for which PDSCH transmission is completed may be allocated in order from the smallest HARQ process numbers. Even in this case, the corresponding UE transmits independent HARQ ACK / NACK feedback (1 bit or 2 bits) to each BS for each PDSCH.
  • the UE transmits independent HARQ ACK / NACK feedback to each BS for each PDSCH.
  • the UE provides downlink control information of the DCI format including HARQ process number and HARQ-related control information for each HARQ process number and NDI and redundancy version for K PDSCHs transmitted for each subframe together with downlink multiple scheduling allocation information.
  • the UE may determine whether the PDSCH is retransmission or initial transmission for data of the HARQ process by checking the HARQ process number and the NDI of the PDSCH.
  • each additional K PDSCH transmission may be independently managed through one HARQ process number.
  • the UE transmits independent HARQ ACK / NACK feedback to each BS for each PDSCH.
  • the UE may feed back one or two ACK / NACKs for each codeword.
  • 4 subframes in the case of FDD correspond to an uplink subframe in the case of TDD or a downlink subframe in which the last PDSCH is received in the case of TDD.
  • a corresponding HARQ ACK / NACK feedback may be defined for each codeword through an uplink subframe.
  • FIG. 9 is a diagram illustrating a configuration of a base station according to another embodiment.
  • the base station 900 includes a control unit 910, a transmitter 920, and a receiver 930.
  • the control unit 910 includes multiple subframe scheduling information and HARQ-related control information of K PDSCHs to a UE belonging to a small cell environment and a cell / base station / RRH / antenna / RU necessary for carrying out the above-described present invention. Controls the overall operation of the base station according to transmitting the downlink control information.
  • the transmitter 920 and the receiver 930 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention.
  • the controller 910 generates a downlink control channel including downlink control information including multiple subframe scheduling information and HARQ-related control information of K PDSCHs.
  • the transmitter 920 transmits downlink control information on the generated downlink control channel to the terminal.
  • Transmitter 920 is a terminal through the control channel downlink control information including HARQ-related control information of the K PDSCH transmitted in K consecutive (non-consecutive) K (K is a natural number greater than 2)
  • K is a natural number greater than 2
  • the K PDSCH may be transmitted to the UE in each of the K downlink subframes according to the multi-subframe scheduling information.
  • the control unit 910 In order to transmit the multiple subframe scheduling information for scheduling the K PDSCH, the control unit 910 generates a downlink control channel including the indication information signaling the type of scheduling, the transmitter 920 is a downlink generated to the terminal
  • the link control channel may be included in the downlink signal and transmitted.
  • the indication information indicates any one of multiple TTI, multiple subframe scheduling, and cross subframe scheduling as described above.
  • the HARQ-related control information may include a HARQ process number, a new-data indicator (NDI), and a redundancy version for K PDSCHs.
  • the HARQ related control information may include a single HARQ process number for K PDSCHs or may include respective HARQ process numbers for K PDSCHs.
  • the HARQ-related control information may include a single NDI and redundancy version for K PDSCHs, or may include respective NDI and redundancy versions for K PDSCHs.
  • the receiver 930 receives HARQ ACK / NACK for K PDSCHs from the UE.
  • FIG. 10 is a diagram illustrating a configuration of a user terminal according to another embodiment.
  • the user terminal 1000 includes a receiver 1030, a controller 1010, and a transmitter 1020.
  • the receiver 1030 receives downlink control information, data, and a message from a base station through a corresponding channel.
  • the controller 1010 may include multiple subframe scheduling information and HARQ-related control information of K PDSCHs to a UE belonging to a small cell environment and a cell / base station / RRH / antenna / RU necessary for carrying out the above-described present invention. It controls the overall operation of the terminal according to the transmission of the downlink control information.
  • the transmitter 1020 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • the receiver 1030 receives downlink control information including multiple subframe scheduling information and HARQ-related control information from a base station through a control channel.
  • the receiver 1030 may receive K PDSCHs from each of the K downlink subframes from the base station according to the multi-subframe scheduling information.
  • the transmitter 1020 transmits HARQ ACK / NACK for K PDSCHs to the base station.
  • the transmitting unit 1020 may transmit the HARQ ACK / NACK for the K PDSCHs to the base station by performing step S830 described above with reference to FIG. 8.
  • the HARQ related control information may include a single HARQ process number for K PDSCHs or may include respective HARQ process numbers for K PDSCHs.
  • the HARQ-related control information may include a single NDI and a redundancy version for K PDSCHs, or may include respective NDI and redundancy versions for K PDSCHs.
  • the HARQ related control information may include a single redundancy version for K PDSCHs and respective NDIs for K PDSCHs.
  • the method and apparatus described so far transmit / receive downlink control information including multiple subframe scheduling information and HARQ-related control information of K PDSCHs to a UE belonging to a required small cell environment and an arbitrary cell / base station / RRH / antenna / RU. And a device thereof.
  • the UE may identify which PDSCH to retransmit. Can be.

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

Abstract

L'invention concerne un procédé et un appareil permettant la transmission et la réception d'informations de commande en liaison descendante. Selon un mode de réalisation de l'invention, un procédé de transmission d'informations en liaison descendante par une station de base comprend les étapes consistant à : transmettre des informations concernant la répartition de sous-trames multiples répartissant K canaux physiques partagés en liaison descendante (PDSCH) qui sont émises sur un nombre continu ou non continu K (K étant un entier naturel supérieur à deux) de sous-trames de liaison descendante et des informations de commande en liaison descendante incluant des informations de commande concernant la requête de répétition automatique hybride (HARQ) desdits K PDSCH, à un terminal par le biais d'un canal de commande ; transmettre K PDSCH, chacun ayant lesdites K sous-trames en liaison descendante, au terminal, sur la base des informations concernant la répartition des sous-trames multiples ; et la réception de HARQ ACK/NACK pour les K PDSCH du terminal.
PCT/KR2014/003338 2013-04-19 2014-04-17 Procédé et appareil permettant la transmission et la réception d'informations de commande en liaison descendante Ceased WO2014171754A1 (fr)

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WO2021051363A1 (fr) * 2019-09-19 2021-03-25 北京小米移动软件有限公司 Procédé et appareil de transmission de rétroaction harq, dispositif de communication et support de stockage
WO2023282373A1 (fr) * 2021-07-09 2023-01-12 엘지전자 주식회사 Procédé et dispositif pour effectuer une réémission dans un système de communication sans fil
WO2023014151A1 (fr) * 2021-08-05 2023-02-09 엘지전자 주식회사 Procédé et dispositif de transmission et de réception de pucch dans un système de communication sans fil

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