WO2016010276A1 - Procédé de traitement de retransmission de données et appareil associé - Google Patents

Procédé de traitement de retransmission de données et appareil associé Download PDF

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Publication number
WO2016010276A1
WO2016010276A1 PCT/KR2015/006480 KR2015006480W WO2016010276A1 WO 2016010276 A1 WO2016010276 A1 WO 2016010276A1 KR 2015006480 W KR2015006480 W KR 2015006480W WO 2016010276 A1 WO2016010276 A1 WO 2016010276A1
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Prior art keywords
cell
unlicensed band
downlink
band cell
data
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PCT/KR2015/006480
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English (en)
Korean (ko)
Inventor
박규진
이경준
노민석
최우진
Original Assignee
주식회사 케이티
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Priority claimed from KR1020150065260A external-priority patent/KR20160010848A/ko
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Publication of WO2016010276A1 publication Critical patent/WO2016010276A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the present invention relates to a data retransmission processing method and apparatus thereof. More specifically, the present invention relates to a method and apparatus for operating a hybrid automatic repeat request (HARQ) of a terminal and a base station for performing communication using an unlicensed band cell.
  • HARQ hybrid automatic repeat request
  • 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 technique for allowing carrier aggregation to be applied in various deployment scenarios has been discussed.
  • the carrier merging technology is a technology for improving data transmission / reception rate by merging one or more component carriers to transmit and receive data, and thus, an available frequency is increased for the terminal, thereby processing a large amount of data at high speed.
  • each frequency band is used by different wireless communication systems according to the policy, there is a problem that the compatibility is poor.
  • the present invention for solving the above problems is to propose a method that can ensure the reliability of the data when different wireless communication systems transmit and receive data using the same frequency band.
  • the present invention intends to define a specific HARQ retransmission operation when the terminal and the base station communicate using a cell using an unlicensed band frequency.
  • a method for processing data retransmission by a terminal the step of performing downlink data reception or uplink data transmission in an unlicensed band cell and downlink data reception or uplink data transmission fails Receiving downlink control information including scheduling information for hybrid automatic repeat request (HARQ) retransmission; And performing a HARQ retransmission operation on downlink data or uplink data in a licensed band cell, wherein the unlicensed band cell is a cell using a frequency of an unlicensed band shared by one or more communication systems.
  • HARQ hybrid automatic repeat request
  • the present invention provides a method for processing data retransmission by the base station, the step of performing downlink data transmission or uplink data reception in the unlicensed band cell, and when downlink data transmission or uplink data reception fails, HARQ ( Hybrid automatic repeat request) transmitting downlink control information including scheduling information for retransmission and performing a HARQ retransmission operation on downlink data or uplink data in a licensed band cell. It provides a method that is a cell using a frequency of an unlicensed band shared by one or more communication systems.
  • the present invention provides a terminal for processing data retransmission, a control unit performing downlink data reception or uplink data transmission in an unlicensed band cell, and when the downlink data reception or uplink data transmission fails, HARQ (Hybrid automatic) repeat request) including a receiving unit for receiving downlink control information including scheduling information for retransmission, wherein the control unit performs a HARQ retransmission operation for downlink data or uplink data in a licensed band cell, and the unlicensed band cell
  • a terminal device which is a cell using a frequency of an unlicensed band shared by one or more communication systems.
  • the present invention provides a base station processing data retransmission, a control unit performing downlink data transmission or uplink data reception in an unlicensed band cell, and when the downlink data transmission or uplink data reception fails, HARQ (Hybrid automatic) repeat request) including a transmitter for transmitting downlink control information including scheduling information for retransmission, wherein the control unit performs a HARQ retransmission operation on downlink data or uplink data in a licensed band cell, and an unlicensed band cell
  • a base station apparatus which is a cell using a frequency of an unlicensed band shared by one or more communication systems.
  • the present invention described above provides an effect of ensuring the reliability of data when different wireless communication systems transmit and receive data using the same frequency band.
  • the present invention provides an effect of preventing the ambiguity of the terminal operation by defining a specific HARQ retransmission operation in the communication between the terminal and the base station using a cell using an unlicensed band frequency.
  • FIG. 1 exemplarily illustrates a layer 2 structure for downlink carrier aggregation.
  • FIG. 2 is a diagram illustrating a layer 2 structure for uplink carrier aggregation.
  • 3 is a diagram illustrating an OFDM symbol for transmitting a control signal in one subframe by way of example.
  • FIG. 4 is a diagram for describing self-carrier scheduling and cross-carrier scheduling on a multiple carrier.
  • 5 is a diagram for describing a downlink control information format.
  • FIG. 6 is a diagram for describing an operation of a terminal performing communication using a licensed band and an unlicensed band.
  • FIG. 7 is an exemplary diagram for describing an available period in an unlicensed band cell.
  • FIG. 8 is a view for explaining the operation of the terminal according to an embodiment of the present invention.
  • FIG. 9 is a view for explaining the operation of the base station according to another embodiment of the present invention.
  • FIG. 10 is a view showing the configuration of a user terminal according to another embodiment of the present invention.
  • FIG. 11 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
  • 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
  • radio resources for uplink or downlink data transmission may be allocated to one UE through a plurality of carriers or serving cells. Therefore, it is possible to support an improved data transmission rate as compared with the existing communication method operating in a single carrier or serving cell.
  • CA carrier aggregation
  • CA capable terminal in case of a CA capable terminal belonging to the coverage of a base station supporting a CA, a primary cell connected through an initial RRC connection / configuration procedure with the base station
  • a Scell (Secandary cell) addition / release process may be performed through an RRC connection reconfiguration process.
  • the CA capable terminal may additionally combine up to five component carriers or serving cells through Scell activation / deactivation through MAC CE (Control Element) signaling.
  • FIG. 1 exemplarily illustrates a layer 2 structure for downlink carrier aggregation.
  • FIG. 2 is a diagram illustrating a layer 2 structure for uplink carrier aggregation.
  • an independent HARQ entity is defined for each CC or serving cell when uplink or downlink data transmission is performed as shown in FIGS. 1 and 2, and is independent for each CC or serving cell.
  • HARQ procedure may be operated.
  • HARQ entities are defined for each CC or serving cell, and as the HARQ procedure is independently performed for each CC or serving cell, a transport block (TB) in which initial transmission is performed through an arbitrary CC or serving cell is performed. Retransmission is performed through the same CC or serving cell.
  • TB transport block
  • 3 is a diagram illustrating an OFDM symbol for transmitting a control signal in one subframe by way of example.
  • the control region includes transmission of PHICH, PCFICH, and PDCCH.
  • the PDCCH is spread evenly allocated to the number of OFDM symbols to which the PDCCH indicated by the PCFICH is transmitted, except for the resources in which the PHICH and the PCFICH are used.
  • FIG. 4 is a diagram for describing self-carrier scheduling and cross-carrier scheduling on a multiple carrier.
  • FIG. 4A is a diagram illustrating self-carrier scheduling on multiple carriers, and independently schedules a PDSCH on each carrier.
  • a PDCCH exists separately for each carrier, and the PDCCH of each carrier schedules the PDSCH of the corresponding carrier. That is, data is transmitted in each carrier by a control channel transmitted every subframe within a 1 ms subframe.
  • 4B is a diagram illustrating a cross-carrier scheduling operation on multiple carriers, and relates to a case in which PDSCHs for multiple carriers are configured in one carrier.
  • a PDCCH existing in one carrier may schedule a PDSCH that can be transmitted on multiple carriers.
  • data is transmitted in multiple carriers by a control channel transmitted every subframe within a 1 ms subframe.
  • 5 is a diagram for describing a downlink control information format.
  • a downlink control information (DCI) format indicating scheduling grant for uplink or downlink transmission may be identified. According to each uplink or downlink transmission method and usage, DCI formats are separately transmitted.
  • a radio access technology (RAT) for efficiently using a limited frequency band is intended to provide high spectral efficiency through technologies such as MIMO, ICIC, and CoMP.
  • RAT radio access technology
  • CA carrier aggregation
  • an unlicensed band unlike a licensed band, a plurality of users, including individuals, are freely available to provide wireless communication service within the regulation of each country, not a wireless channel exclusively used by any operator. .
  • signal interference and coexistence with other communication systems may occur when providing an LTE / LTE-Advanced service through an unlicensed band.
  • LTE Long Term Evolution
  • various short range wireless communication protocols such as WiFi, Bluetooth, and NFC
  • problems may arise.
  • a co-existence problem may occur for each LTE operator. Therefore, there is a need for a method for solving this problem.
  • LBT wireless channel access
  • LBT wireless channel access
  • FIG. 6 is a diagram for describing an operation of a terminal performing communication using a licensed band and an unlicensed band.
  • a licensed-assisted access scheme LTE through carrier aggregation with a carrier or a cell configured through a licensed band Consider providing services.
  • the primary carrier supports a frame structure in the form of FDD or TDD through the licensed band, and in the case of a secondary carrier configured through the unlicensed band in the form of downlink only. Can be configured.
  • the secondary carrier configured through the unlicensed band may be in the form of supporting both uplink and downlink.
  • the primary carrier may process both uplink and downlink using a licensed band exclusively used by the corresponding mobile communication system.
  • the UE may process only downlink-only data using a frequency using an unlicensed band as a secondary carrier.
  • the terminal may process both uplink and downlink data through the secondary carrier.
  • an unlicensed band cell a cell configured through the unlicensed band of FIG. 6 will be referred to as an unlicensed band cell.
  • this is for convenience of description and has no limitation on its name, and may be used to include all cells of a mobile communication system using an unlicensed band frequency. That is, an unlicensed band cell refers to a cell using an unlicensed band frequency shared by one or more communication systems.
  • the present invention provides a method for stably processing data retransmission that may occur in a time interval in which an unlicensed band frequency cannot be used when communication is performed in an unlicensed band cell using frequencies of an unlicensed band shared by multiple communication systems. And an apparatus.
  • FIG. 7 is an exemplary diagram for describing an available period in an unlicensed band cell.
  • an unlicensed band cell formed by an unlicensed band frequency by any one operator an unlicensed band cell formed by another operator in a corresponding frequency band or another radio access technology such as WiFi or Bluetooth (Radio) Access frequency (RAT) systems share the frequency band exclusively. Accordingly, when the corresponding frequency band is available through LBT (Listen before talk), it is possible to support the terminal by configuring an unlicensed band cell through the frequency band of the corresponding unlicensed band for a specific time. However, even if the unlicensed band cell is configured through the corresponding unlicensed band frequency, after a certain time, the specific frequency band must be emptied for another operator or another communication system for a specific time.
  • LBT Location before talk
  • an unlicensed band cell available period a time period during which an arbitrary carrier configures an unlicensed band cell in an arbitrary frequency band and can support a terminal of the corresponding carrier.
  • an unlicensed band cell unavailable section a time period in which an unlicensed band cell cannot be configured in a corresponding frequency band.
  • a UE access method for an unlicensed band cell configured in an unlicensed spectrum may be configured as carrier aggregation or dual connectivity (DC) together with a normal LTE cell configured in a licensed spectrum.
  • DC dual connectivity
  • the general LTE cell may be configured as a primary cell.
  • an unlicensed band cell forms a CA or DC together with a general cell
  • an independent HARQ process is based on the unlicensed band cell.
  • Data transmission and reception should be made. That is, when a reception failure for data transmitted through an unlicensed band cell is retransmitted, the corresponding unlicensed band cell should be performed.
  • any transport block constituting the corresponding data is a PDSCH or uplink subframe of a downlink subframe configured in an unlicensed band cell available period.
  • retransmission for the corresponding transport block should also be performed through an uplink subframe or a downlink subframe of the same unlicensed band cell.
  • the unlicensed band cell falls into an unlicensed band cell unavailable period for a predetermined time after initial transmission for the corresponding transport block, a downlink subframe or an uplink subframe of the unlicensed band cell for retransmission can be secured. Do not have A problem occurs.
  • a terminal and a base station performing communication using an unlicensed band cell have a problem in that communication data reliability due to data loss or data loss cannot be guaranteed when processing data according to a conventional data retransmission scheme.
  • the present invention has been proposed to propose a HARQ retransmission scheme that can ensure data reliability even when using an unlicensed band cell.
  • the present invention proposes a resource allocation method for PUSCH or PDSCH retransmission, which is an uplink or downlink data channel in an unlicensed band cell.
  • a PDSCH or PUSCH retransmission method in each case where cross carrier scheduling and self carrier scheduling are applied.
  • a method of retransmitting data in each case to which self-carrier scheduling is directly transmitted is applied.
  • FIG. 8 is a view for explaining the operation of the terminal according to an embodiment of the present invention.
  • the present invention provides a method for a UE to process data retransmission, when performing downlink data reception or uplink data transmission in an unlicensed band cell, and when downlink data reception or uplink data transmission fails, HARQ (Hybrid automatic) repeat request) receiving downlink control information including scheduling information for retransmission and performing HARQ retransmission operation on downlink data or uplink data in a licensed band cell, wherein the unlicensed band cell includes one or more It provides a method that is a cell using the frequency of the unlicensed band shared by the communication system.
  • HARQ Hybrid automatic repeat request
  • the terminal of the present invention includes performing downlink data reception or uplink data transmission in an unlicensed band cell (S810).
  • the terminal may receive downlink data in an unlicensed band cell.
  • the terminal may transmit uplink data in the unlicensed band cell.
  • the terminal may receive only downlink data or only uplink data through the unlicensed band cell according to the configuration of the unlicensed band cell or the configuration of the base station.
  • the terminal may receive and transmit downlink data and uplink data through the unlicensed band cell.
  • the terminal may configure carrier aggregation using a licensed band cell and an unlicensed band cell.
  • the terminal may configure dual connectivity using a licensed band cell and an unlicensed band cell.
  • Carrier aggregation is a method of communicating with the terminal by configuring a licensed band cell and an unlicensed band cell in the same base station, dual connectivity is a base station constituting the licensed band cell and the base station constituting the unlicensed band cell is connected to the non-ideal backhaul It means the case. That is, the present invention can be applied to the case where the UE configures carrier aggregation using the unlicensed band cell and the licensed band cell and when the dual connectivity is configured.
  • the terminal may include receiving downlink control information including scheduling information for HARQ retransmission (S820). For example, the terminal may not receive downlink data transmitted by the base station. Or, the terminal may not normally decode downlink data transmitted by the base station. In this case, the terminal should receive again from the base station through the HARQ process for the data that has not been received. In order to receive the missing data again, the terminal must receive scheduling information related to radio resources through which the missing data is transmitted.
  • the UE performs an operation according to the HARQ process to receive data without missing the base station. That is, when the base station does not normally receive the uplink data transmitted by the terminal, the terminal should receive downlink control information including scheduling information for retransmission from the base station for retransmission of the missing uplink data.
  • the terminal checks the UL grant of the received downlink control information and retransmits the missing uplink data through the corresponding radio resource.
  • the downlink control information may include downlink assignment information or uplink grant information.
  • the downlink control information includes information indicating a cell for retransmission of missing data or information indicating whether to change the cell for retransmission or downlink allocation information It may also include information indicating whether or not for retransmission.
  • the terminal may include performing a HARQ retransmission operation on downlink data or uplink data in the licensed band cell (S830). For example, when some data of the downlink data received through the unlicensed band cell is missing, the terminal may receive the missing downlink data through the licensed band cell. Alternatively, when retransmission of uplink data transmitted through the unlicensed band cell is required, the terminal may retransmit the corresponding uplink data through the licensed band cell. To this end, the terminal may perform an HARQ operation in the licensed band cell based on the downlink control information received in step S820.
  • the terminal may perform stable data transmission and reception even if the characteristics of the unlicensed band cell exist.
  • HARQ retransmission is performed through a primary cell of a licensed band.
  • the terminal of the present invention may perform the HARQ operation through the primary cell of the licensed band constituting carrier aggregation or dual connectivity.
  • the user equipment determines whether a downlink assignment or an uplink grant is information for initial transmission of downlink data or uplink data or information for HARQ retransmission operation from the base station. Downlink control information including a may be received.
  • the primary cell in which HARQ retransmission for PDSCH / PUSCH initial transmission of the unlicensed band cell is performed is a primary cell of a MCG (Master Cell Group) or a SCG (Secondary). Cell may be defined as a special cell.
  • MCG means a cell group associated with the master base station
  • SCG means a cell group associated with the secondary base station.
  • the primary cell may mean a cell having a PUSCH transmission function, establishing an RRC connection with the terminal, and serving as a reference for handover.
  • the special cell refers to a cell having a PUSCH function in the secondary cell group, and may also be referred to as a PSCell.
  • whether the corresponding downlink allocation is scheduling information for initial transmission of downlink data. It may be distinguished whether scheduling information for retransmission according to the HARQ operation. That is, when the downlink allocation DCI is the initial transmission downlink allocation DCI for any HARQ process number according to whether it is PDSCH resource allocation control information for initial transmission or PDSCH resource allocation control information for HARQ retransmission, It may be defined to mean PDSCH transmission resource allocation in the corresponding unlicensed band cell. In addition, in the case of downlink allocation DCI for HARQ retransmission for a certain HARQ process number, it may be defined to mean PDSCH transmission resource allocation in a primary cell of a licensed band.
  • HARQ operation on the uplink data may also be performed similarly as described above.
  • uplink grant DCI (UL grant DCI) for the unlicensed band cell
  • whether the uplink grant information is for PUSCH initial transmission according to whether a new data indicator bit is set. Whether it is for retransmission can be distinguished. That is, when a new data indication bit is an UL grant for a corresponding initial transmission, it may be defined to mean PUSCH resource allocation in an uplink subframe of an unlicensed band cell. In addition, when the new data indication bit is an uplink grant for HARQ retransmission, it may be defined to mean PUSCH resource allocation in a primary cell of a licensed band.
  • corresponding PUSCH retransmission is performed in a primary cell of a licensed band according to UL grant DCI in which initial transmission for a corresponding HARQ process is performed. It can also be defined to
  • the present embodiment may be equally applied regardless of whether self-carrier scheduling or cross-carrier scheduling is applied as a scheduling method for an unlicensed band cell.
  • self-carrier scheduling when an unlicensed band cell enters an unavailable period at the time of HARQ retransmission, a downlink allocation DCI for the PDSCH retransmission or an uplink grant DCI for PUSCH retransmission may be received. Unexpected problems may arise. Therefore, in this case, it may be defined that a downlink allocation DCI for the corresponding PDSCH retransmission or an uplink grant DCI for the PUSCH retransmission is received through the PDCCH or the EPDCCH of the primary cell.
  • a method for distinguishing whether the corresponding DCI is for a primary cell having the same HARQ process number or for retransmission of a PDSCH or a PUSCH of an unlicensed band cell that has entered an unusable interval is transmitted through the primary cell.
  • the DCI format may be defined to include a Carrier Indicator Field (CIF) for a predetermined time, and may be distinguished through this.
  • a new information area for distinguishing this may be defined and included in a corresponding DCI format for a predetermined time.
  • Second Embodiment Performing HARQ Retransmission Operation Through Scheduling Cell of Licensed Band
  • This embodiment is a method applicable when cross-carrier scheduling for an unlicensed band cell is configured.
  • the HARQ retransmission is performed through a scheduling cell of a licensed band in which scheduling control information for PDSCH or PUSCH of the unlicensed band cell is transmitted. This can be done. That is, based on the CIF (Carrier Indicator Field) information included in the downlink allocation DCI transmitted through the corresponding license band and the new data indication bit, whether the corresponding DCI is resource allocation for initial data transmission in the unlicensed band cell or HARQ retransmission. Can be set to distinguish whether or not resource allocation for operation.
  • CIF Carrier Indicator Field
  • the corresponding PDSCH is corresponding downlink allocation DCI. It may be defined to be transmitted through an unlicensed band cell according to the resource allocation information of.
  • the corresponding PDSCH is corresponding license band according to resource allocation information of the corresponding DCI. It may be defined to be transmitted through the scheduling cell of.
  • an operation is performed by distinguishing whether the corresponding DCI is for initial transmission or HARQ retransmission based on the CIF information included in the uplink grant DCI transmitted through the license band and the new data indication bit. can do. For example, if DCI is scheduling information for an unlicensed band cell according to CIF, and a new data indication bit indicates initial transmission resource allocation information for HARQ process number, the corresponding PUSCH is included in the resource allocation information of the corresponding UL grant DCI. Accordingly, it may be defined to be transmitted through an unlicensed band cell.
  • the corresponding PUSCH is corresponding license band according to resource allocation information of the corresponding UL grant DCI. It may be defined to be transmitted through the scheduling cell of. However, in case of retransmission through PHICH NACK without transmitting / receiving UL grant for retransmission separately, the PUSCH retransmission may be defined in the scheduling cell of the licensed band according to initial transmission resource allocation information for the PUSCH of the corresponding HARQ process number. have.
  • the cell on which the HARQ retransmission operation is performed may be determined according to whether an unlicensed band cell is available. That is, in an unlicensed band cell, retransmission is performed for a PDSCH or a PUSCH through the unlicensed band cell, and in an unusable interval, a PDSCH or PUSCH is used for a cell in a licensed band cell. Can be defined to be retransmission.
  • the cell of the licensed band where the HARQ retransmission operation is performed may be a primary cell of the first embodiment or a scheduling cell of the second embodiment.
  • downlink allocation DCI for the corresponding HARQ retransmission A retransmission operation may be performed through a downlink subframe or an uplink subframe of an unlicensed band cell according to resource allocation information of a DL assignment DCI or UL grant DCI. If HARQ retransmission is performed for PDSCH or PUSCH for initial transmission through an unlicensed band cell, if the corresponding unlicensed band cell is in an unavailable period, the HARQ retransmission operation may be performed in the licensed band cell. . That is, the retransmission may be performed through the primary cell of the licensed band by applying the above-described first embodiment, or the retransmission may be performed by the scheduling cell of the licensed band by applying the second embodiment.
  • the state of the unlicensed band cell may be signaled to the corresponding terminal explicitly or implicitly. There is no restriction on the signaling method.
  • the terminal of the present invention may receive cell change indication information included in the downlink control information. For example, in the present embodiment, when a downlink allocation DCI or an uplink grant DCI for HARQ retransmission for PDSCH or PUSCH for which initial transmission is performed through an unlicensed band cell, a retransmission cell change indication region is defined in the corresponding DCI. Can be. The terminal may check whether the cell in which the retransmission is performed is changed through the information in the cell change indication information region.
  • a cell change indication is provided to a downlink allocation DCI including PDSCH resource allocation information for HARQ retransmission of the corresponding downlink data.
  • An information area may be defined and configured to signal to the UE whether to change a cell in which a corresponding PDSCH retransmission is performed. For example, if the cell change indication region is set to "0", the PDSCH retransmission is performed through the unlicensed band cell, and if the cell change indication region is set to "1", the license band cell The PDSCH retransmission may be configured through the MS.
  • the cell on which PDSCH retransmission is performed may be a primary cell as in the first embodiment or may be a scheduling cell as in the second embodiment.
  • the value of the cell change indication information area as exemplified above may be set to various values only as an example for convenience of understanding.
  • the retransmission when the unlicensed band cell is not available at the time when the retransmission is performed, the retransmission may be performed through the licensed band cell regardless of the value of the cell change indication information region.
  • Embodiment 5 The Unlicensed Band Cell Is Not Set to Support HARQ Operation
  • HARQ operation is not performed. That is, HARQ ACK / NACK feedback for PDSCH or PUSCH transmission through all unlicensed band cells is not performed, and retransmission for transmission / reception failure may be defined to be performed according to ARQ retransmission of a higher layer.
  • HARQ retransmission may be performed through the corresponding unlicensed band cell.
  • the state of the unlicensed band cell is an available interval
  • HARQ retransmission operation is performed in the licensed band cell as described in the first to fourth embodiments, and only for the unlicensed band cell when the corresponding unlicensed band cell is not available. All HARQ processes can be stopped.
  • retransmission for the PDSCH or the PUSCH of the HARQ process that has not received the HARQ ACK may be defined to be performed at the ARQ stage.
  • the present invention relates to an HARQ procedure of an unlicensed band cell and a method for retransmitting HARQ, which may be performed in the form of one or a combination of the aforementioned various embodiments.
  • the names described above are to aid the understanding of the present invention, and the rights of the present invention are not limited by the names.
  • the present invention described above can be equally applied to a base station. That is, when the base station transmits the downlink data and receives the uplink data, the above descriptions based on the terminal may be applied correspondingly or may be applied in the same manner. In the following, the present invention is briefly described again from the viewpoint of a base station.
  • FIG. 9 is a view for explaining the operation of the base station according to another embodiment of the present invention.
  • the base station performs downlink data transmission or uplink data reception in an unlicensed band cell, and when the downlink data transmission or uplink data reception fails, HARQ (Hybrid automatic repeat request) retransmission
  • the method may include transmitting downlink control information including scheduling information for performing a HARQ retransmission operation on downlink data or uplink data in a licensed band cell.
  • the unlicensed band cell may mean a cell using a frequency of the unlicensed band shared by one or more communication systems.
  • the base station of the present invention includes performing downlink data transmission or uplink data reception in an unlicensed band cell (S910).
  • the base station may transmit downlink data to the terminal and may receive uplink data from the terminal.
  • the base station may transmit and receive downlink data and uplink data using the aforementioned unlicensed band cell.
  • the base station may set or configure carrier aggregation or dual connectivity in the terminal.
  • the base station may include transmitting downlink control information including scheduling information for HARQ retransmission (S920). For example, when downlink data transmission or uplink data reception fails, downlink control information (DCI) including scheduling information for data retransmission operation is transmitted.
  • DCI downlink control information
  • the downlink control information may be transmitted through an unlicensed band cell or a licensed band cell. That is, when the terminal configures carrier aggregation and cross carrier scheduling is set, downlink control information may be transmitted through a scheduling cell (licensed band cell).
  • the downlink control information may include different information according to each of the first to fifth embodiments described above.
  • the downlink control information may include information for identifying whether downlink allocation or uplink grant included in DCI is for initial data transmission or retransmission.
  • the downlink control information may include cell change indication information indicating whether to change the cell on which the HARQ operation is to be performed.
  • it may include a variety of information required to perform each embodiment of the present invention described above.
  • the base station may include performing a HARQ retransmission operation on downlink data or uplink data in the licensed band cell (S930).
  • the base station may perform a HARQ operation on the licensed band cell for data transmitted and received in the unlicensed band cell.
  • the base station may perform HARQ retransmission operation in the primary cell or the scheduling cell of the licensed band.
  • the base station may perform the HARQ retransmission operation in the licensed band cell.
  • Performing HARQ retransmission operation means allocating PDSCH or PUSCH resources for data retransmission in the corresponding licensed band cell.
  • the base station can perform all the operations of the present invention described with reference to the first to fifth embodiments.
  • the present invention provides an effect of ensuring the reliability of data when different wireless communication systems transmit and receive data using the same frequency band.
  • the present invention provides an effect of preventing the ambiguity of the terminal operation by defining a specific HARQ retransmission operation in the communication between the terminal and the base station using a cell using an unlicensed band frequency.
  • FIG. 10 is a view showing the configuration of a user terminal according to another embodiment of the present invention.
  • the terminal 1000 of the present invention provides a control unit 1010 that performs downlink data reception or uplink data transmission in an unlicensed band cell, and when downlink data reception or uplink data transmission fails, HARQ. (Hybrid automatic repeat request) including a receiving unit 1030 for receiving downlink control information including scheduling information for retransmission, the control unit 1010 is a HARQ retransmission operation for downlink data or uplink data in a licensed band cell Do this.
  • the unlicensed band cell refers to a cell using a frequency of the unlicensed band shared by one or more communication systems.
  • the receiver 1030 receives downlink data, a signal, and a message from a base station through a corresponding channel.
  • the receiver 1030 may receive downlink control information including information necessary to perform a HARQ retransmission operation according to each embodiment described above.
  • the downlink control information may be used to distinguish whether downlink assignment or uplink grant is information for initial transmission of downlink data or uplink data or information for HARQ retransmission operation. May contain information.
  • the downlink control information may include cell change indication information indicating whether to change the cell on which the HARQ retransmission operation is performed.
  • the controller 1010 configures carrier aggregation or dual connectivity.
  • the controller 1010 may perform the unlicensed band cell in an unlicensed band cell, and may perform the licensed band cell in an unlicensed band cell.
  • the controller 1010 may determine a cell performing the HARQ retransmission operation based on the downlink control information, and perform the HARQ retransmission operation in the determined licensed band cell.
  • the licensed band cell may be a primary cell or a special cell and may be a scheduling cell.
  • controller 1010 is a HARQ in the unlicensed band cell formed through the cell (or carrier) and CA (Carrier Aggregation) or DC (Dual Connectivity) in the licensed spectrum (licensed spectrum) necessary to carry out the present invention described above. Control the overall operation of the terminal needed to define the retransmission operation.
  • the transmitter 1130 transmits uplink control information, data, and a message to a base station through a corresponding channel.
  • FIG. 11 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
  • the base station 1100 includes a control unit 1110 for performing downlink data transmission or uplink data reception in an unlicensed band cell and downlink data transmission or uplink data reception. If this fails, the transmitter 1120 for transmitting downlink control information including scheduling information for HARQ (Hybrid automatic repeat request) retransmission, the control unit 1110 is a downlink data or uplink in the licensed band cell HARQ retransmission operation may be performed on data.
  • the unlicensed band cell refers to a cell using a frequency of the unlicensed band shared by one or more communication systems.
  • the transmitter 1120 and the receiver 1130 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present invention.
  • the transmitter 1120 may transmit downlink control information necessary for performing the HARQ retransmission operation to the terminal.
  • the downlink control information may be used to distinguish whether downlink assignment or uplink grant is information for initial transmission of downlink data or uplink data or information for HARQ retransmission operation. May contain information.
  • the downlink control information may include cell change indication information indicating whether to change the cell on which the HARQ retransmission operation is performed.
  • the controller 1110 sets carrier merge or dual connectivity of the terminal.
  • the controller 1110 may control the unlicensed band cell to be performed in the unlicensed band cell and the unlicensed band cell to be performed in the licensed band cell.
  • the controller 1110 may determine a cell for performing the HARQ retransmission operation and control the performance of the HARQ retransmission operation in the determined licensed band cell.
  • the licensed band cell may be a primary cell or a special cell and may be a scheduling cell.
  • the controller 1110 is a HARQ in an unlicensed band cell formed through a cell (or carrier) and CA (Carrier Aggregation) or DC (Dual Connectivity) in a licensed spectrum required for carrying out the aforementioned invention It controls the overall base station's behavior necessary to define the retransmission behavior.

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

Abstract

La présente invention concerne un procédé de traitement de retransmission de données et un appareil associé, et, plus particulièrement, un procédé et un appareil pour une opération de demande de répétition automatique hybride (HARQ) d'un terminal et d'une station de base qui réalisent une communication à l'aide d'une cellule de bande non autorisée. En particulier, la présente invention concerne un procédé et un appareil pour traiter une retransmission de données par un terminal, le procédé comprenant les étapes consistant : à réaliser une réception de données de liaison descendante ou une transmission de données de liaison montante dans la cellule de bande non autorisée ; à recevoir des informations de commande de liaison descendante comprenant des informations de planification pour une retransmission HARQ lorsque la réception de données de liaison descendante ou la transmission de données de liaison montante échoue ; et à réaliser la retransmission HARQ pour des données de liaison descendante ou des données de liaison montante dans une cellule de bande autorisée, la cellule non autorisée étant une cellule utilisant une fréquence dans une bande non autorisée qu'un ou plusieurs systèmes de communication partagent.
PCT/KR2015/006480 2014-07-18 2015-06-25 Procédé de traitement de retransmission de données et appareil associé WO2016010276A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2014-0091305 2014-07-18
KR20140091305 2014-07-18
KR10-2015-0065260 2015-05-11
KR1020150065260A KR20160010848A (ko) 2014-07-18 2015-05-11 데이터 재전송 처리 방법 및 그 장치

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US11381352B2 (en) 2016-02-03 2022-07-05 Honda Motor Co., Ltd. HARQ ID for consecutive uplink subframes in a wireless device
CN114731238A (zh) * 2020-02-07 2022-07-08 Oppo广东移动通信有限公司 配置授权定时器的使用方法与装置、终端设备和网络设备
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US11374700B2 (en) 2016-02-01 2022-06-28 Honda Motor Co., Ltd. Uplink grant for consecutive uplink subframes in a wireless device
US11632749B2 (en) 2016-02-02 2023-04-18 Honda Motor Co., Ltd. Signaling for SRS and PUSCH transmission in a last symbol
US11381352B2 (en) 2016-02-03 2022-07-05 Honda Motor Co., Ltd. HARQ ID for consecutive uplink subframes in a wireless device
CN114731238A (zh) * 2020-02-07 2022-07-08 Oppo广东移动通信有限公司 配置授权定时器的使用方法与装置、终端设备和网络设备
CN114731238B (zh) * 2020-02-07 2023-12-08 Oppo广东移动通信有限公司 配置授权定时器的使用方法与装置、终端设备和网络设备

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