KR20180107417A - Apparatus and method of DL HARQ operation for new radio - Google Patents

Abstract

The present invention proposes a downlink HARQ operation method for a new radio (NR). In particular, an HARQ operation method for supporting efficient multiplexing between data traffic having different QoS requirements such as enhanced mobile broad-band (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). The downlink HARQ operation method includes: a step of allocating downlink radio resources; a step of puncturing the radio resource; and a step of performing emergency URLLC data transmission and reception.

Description

[0001] The present invention relates to a method and an apparatus for a DL HARQ operation for NR,

The present embodiments propose a downlink HARQ operation method for a next generation / 5G radio access network (hereinafter referred to as "NR [New Radio]").

In one embodiment, there is provided a method for downlink HARQ operation for NR, comprising the steps of: allocating downlink radio resources for data transmission of eMBB or mMTC; and allocating some radio resources among downlink radio resources allocated for eMBB or mMTC performing puncturing and performing urgent URLLC data transmission / reception using punctured radio resources.

FIG. 1 shows an example of symbol level alignment among different SCS.
FIG. 2 shows an example of dynamic resource sharing between eMBB and URLLC data for DL.
3 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.
4 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (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 (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, the base station or the cell in this specification is interpreted as a comprehensive meaning indicating a partial region or function covered by BSC (Base Station Controller) in CDMA, NodeB in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-advanced, a standard is constructed by configuring uplink and downlink based on a single carrier or carrier pair. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, the PDCCH, which is an embodiment of the present invention, may be applied to the PDCCH, and the PDCCH may be applied to the portion described with the EPDCCH.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

NR (New Radio)

3GPP recently approved the study item "Study on New Radio Access Technology" for research on next generation / 5G radio access technology, and based on this, RAN WG1 has frame structure, channel coding and modulation , waveform & multiple access scheme and so on. NR is required not only to improve data transmission rate as compared with LTE, but also to design various QoS requirements that are required according to granular and specific usage scenarios. In particular, enhancement mobile broadband (eMBB), massive MTC (MMTC) and URLLC (Ultra Reliable and Low Latency Communications) are defined as typical usage scenarios of NR. structure design is required. Since each usage scenario has different requirements for data rates, latency, reliability, coverage, etc., it is a method to efficiently satisfy the requirements of each usage scenario through frequency bands constituting an NR system. there is a need for an efficient multiplexing of radio resource units based on subcarrier spacing, subframe, TTI, etc., for example.

One method is to support TDM, FDM or TDM / FDM based multiplexing on one or more NR component carriers (s) for numerology with different subcarrier spacing values, and a scheduling unit in the time domain A discussion was made on how to support more than one time unit in composition. In this regard, NR is a type of time domain structure defined as a subframe. Reference numerology for defining the subframe duration is defined as 14 OFDM symbols of 15 kHz sub-carrier spacing (SCS) based normal CP overhead equivalent to LTE To define a single subframe duration. Thus, subframes in NR have a time duration of 1ms. However, unlike LTE, NR subframes are absolute reference time durations, and slots and mini-slots can be defined as time units that are the basis of actual uplink and downlink data scheduling. In this case, the number of OFDM symbols constituting the slot, y value is defined as y = 7 and 14 for the numerology having the SCS value of up to 60 kHz, and for the numerology having the SCS value larger than 60 kHz, y = Lt; / RTI >

Accordingly, any slot can be composed of 7 or 14 symbols, and all symbols are used for DL transmission according to the transmission direction of the corresponding slot, or all symbols are used for UL transmission, or the DL portion + (gap) + UL portion.

Also, a mini-slot composed of a smaller number of symbols than a corresponding slot is defined in an arbitrary numerology (or SCS), and a short-time time-domain scheduling interval is set for uplink / downlink data transmission or reception, A long-time time-domain scheduling interval for uplink / downlink data transmission and reception can be configured. In particular, in the case of transmission and reception of latency critical data such as URLLC, scheduling is performed in units of 0.5 ms (7 symbols) or 1 ms (14 symbols) based on a numerology-based frame structure having a small SCS value, such as 15 kHz , it is difficult to satisfy the latency requirement. Therefore, it is possible to define a mini-slot composed of a smaller number of OFDM symbols than the corresponding slot and to schedule the latency critical data such as the URLLC based on the defined mini-slot.

Alternatively, as described above, by supporting the numerology having different SCS values in one NR Carrier by multiplexing the TDM and / or FDM scheme, it is possible to reduce the number of slots based on the slot (or mini-slot) length defined for each numerology Scheduling of data according to latency requirement is also considered. For example, as shown in FIG. 1, when the SCS is 60 kHz, the symbol length is reduced to about 1/4 of that of the SCS 15 kHz. Therefore, when one slot is composed of 7 OFDM symbols, While the slot length based on 60 kHz is reduced to about 0.125 ms.

In this way, the NR is discussing how to satisfy the requirements of URLLC and eMBB by defining different SCSs or different TTI lengths.

As described above, a method for supporting a scheduling unit having different lengths in the time domain has been discussed as a method for satisfying various usage scenarios in NR. In particular, to satisfy the URLLC requirement, it is necessary to subdivide the scheduling unit in the time-domain. However, from the viewpoint of eMBB, the granular time-domain scheduling unit is not desirable from the viewpoint of cell throughput because it involves excessive control overhead. Also, in terms of MMTC, a slightly longer time interval resource allocation scheme may be more appropriate for coverage enhancement.

In the present invention, a long time-domain resource allocation such as eMBB and mMTC is an effective downlink service to support efficient multiplexing between data traffic for each service in a network in which services requiring efficient allocation of service and short time- We propose a link HARQ operation method.

As described above, in order to support the URLLC service in NR, it is necessary to support a short scheduling unit (or TTI, Transmission Time Interval) that can satisfy the latency boundary in the time domain. On the other hand, in the case of eMBB or mMTC, it is effective to apply the time-domain resource allocation unit, which is slightly longer than the URLLC usage scenario, in terms of control overhead and coverage in defining the scheduling unit in the time domain. In order to satisfy various NR usage scenarios simultaneously, numerology of subcarrier spacing (eg, larger subcarrier spacing such as 60kHz, 120kHz, etc.) that is easy to define a short time interval resource allocation unit suitable for URLLC and subcarrier spacing suitable for eMBB and mMTC (for example, 15kHz for eMBB or 3.75kHz for mMTC) in a mixed numerology structure supporting one numerical value via an NR carrier, or a subframe or slot or mini-slot in an NR carrier operating in any one numerology It is necessary to simultaneously support time-domain scheduling units having different lengths. As a method, semi-static time / frequency resource (or region) in which resource allocation is performed based on the optimal scheduling unit for each usage scenario is semi-static, and according to the usage scenario of each terminal, You can define resource allocation using time / frequency resources.

However, semi-static resource allocation is not efficient in terms of radio resource utilization in an environment where traffic generation is randomly performed for each usage scenario.

As a method for solving this problem, a method of puncturing some radio resources among downlink radio resources allocated for data transmission of an eMBB or mMTC in a downlink data transmission resource allocation and performing dynamic puncturing based on puncturing Support for eMBB / URLLC multiplexing of superposition based on superposition of URLLC data transmission signal for some radio resources is required. In other words, it supports dynamic resource sharing between eMBB and URLLC, which is used for urgent URLLC data transmission by puncturing (or superpositioning) some eMBB (or mMTC) downlink resources that have already been allocated resources and on-going transmission .

In addition, when a dynamic resource sharing scheme based on dynamic puncturing (or superposition) between eMBB and URLLC is applied to the NR downlink, a method of explicitly indicating punctured radio resources to the corresponding eMBB UE for URLLC data transmission is considered . In this case, the indication method based on the explicit signaling is a method of indicating the puncturing information in a TTI (or a slot, a mini-slot, or a merged slot) in which the corresponding eBB DL data transmission is performed and a subsequent TTI after the corresponding TTI A method of indicating whether puncturing is being performed is being considered.

According to the present invention, when dynamic resource sharing between eMBB and URLLC is applied, a HARQ operation method for a PDSCH of an eMBB terminal punctured for some radio resources among PDSCH transmission resources is proposed. Specifically, we propose a HARQ ACK / NACK feedback method and a retransmission method for eMBB PDSCH affected by the URLLC PDSCH.

However, in the present invention, eMBB or URLLC is described based on usage scenarios. However, from the viewpoint of radio resource allocation and downlink data transmission / reception, an eMBB is defined as a long time-slot resource allocation unit of slot or merged slot unit And can be associated with a terminal or a data session in which a short time-domain resource allocation unit such as a mini-slot or a symbol or a large SCS-based slot unit is defined in case of URLLC.

Specifically, puncturing (or superposition) of a mini-slot or a symbol is performed in a downlink data transmission resource allocated in an arbitrary slot unit or a multiple slot unit, or some frequency resources (some PRBs The present invention can be applied to all PDSCH transmission and reception in which partial radio resource puncturing is performed for an on-going DL transmission in which puncturing (or superposition) is performed only for the PDSCH.

Accordingly, in the present invention, as shown in FIG. 2, a first terminal (eg, an eMBB terminal) or data may be transmitted in a slot unit or a long time interval unit based on a scheduling unit based on puncturing among a given downlink data transmission resource, And the second terminal (e.g., a URLLC terminal) or data corresponds to downlink data transmission using puncturing a part of the downlink resources allocated for the eMBB terminal or data transmission.

As shown in FIG. 2, when a part of PDSCH transmission resources of a first UE is punctured for PDSCH transmission of a second UE, the HARQ process of the first UE is described.

Point 1: HARQ ACK / NACK  feedback resource reconfiguration

NR may be defined to signal timing information and PUCCH resource allocation information for HARQ ACK / NACK feedback for a corresponding PDSCH when allocating a PDSCH for an arbitrary UE. That is, when the DL assignment DCI for a PDSCH is transmitted on the PDCCH, the corresponding DL assignment DCI may include not only the resource allocation information for the PDSCH, but also HARQ ACK / NACK feedback related information of the UE for the corresponding PDSCH.

However, when puncturing for PDSCH transmission of the second UE is performed for a part of the PDSCH transmission resources of the first UE allocated by the DL assignment DCI as described above, the PDSCH reception of the first UE is normally decoded It may not. In order to facilitate decoding of the PDSCH of the first UE, the NR considers a method of notifying the first UE of the puncturing indication information through explicit signaling. However, the notification signaling for the puncturing indication information may be defined to be performed in the PDSCH TTI of the punctured first terminal or may be defined to be performed through the subsequent TTI as described above.

The present invention proposes a HARQ ACK / NACK feedback resource setting method for a PDSCH reception in which puncturing (or superposition) is performed for PDSCH transmission with high priority as described above.

Solution 1. DL assignment DCI  Assigned through HARQ ACK / NACK  Maintain feedback resource configuration information

As a first method for this, the first UE determines whether or not a DL assignment (indicated by a DL assignment in the resource allocation for the corresponding PDSCH (i.e., the first PDSCH), regardless of the dynamic puncturing by the PDSCH of the second UE in the corresponding PDSCH TTI It is possible to define the HARQ ACK / NACK feedback for the first PDSCH based on the HARQ ACK / NACK feedback timing information in the DCI and / or the PUCCH resource allocation related information.

Solution 2. HARQ ACK / NACK  feedback resource reconfiguration

When a certain NR base station punctures some of the PDSCH resources for transmission of the second PDSCH for another UE during transmission of the first PDSCH for the first UE, the NR base station performs puncturing indication signaling for the first UE, And reconfigure HARQ ACK / NACK feedback related information for the first PDSCH to be transmitted. That is, when puncturing is performed on some resources of the transmission resources in the first PDSCH of a slot unit or a multiple slot unit, the HARQ ACK / NACK feedback resource allocation information for the corresponding first PDSCH is reset upon transmission of the puncturing indication information Can be defined to include. Accordingly, when puncturing of some resources among the first PDSCH transmission / reception resources is instructed, the first UE retransmits all or part of the HARQ ACK / NACK feedback related information included in the DL assignment DCI for the PDSCH and punctures HARQ ACK / NACK feedback information for the first PDSCH according to the HARQ ACK / NACK feedback resource reset information included in the HARQ ACK / NACK indication signaling.

In one embodiment of the HARQ ACK / NACK reset method using puncturing indication signaling, the HARQ ACK / NACK feedback reset information included in the puncturing indication signaling may be HARQ ACK / NACK feedback timing reset information. In this case, the first MS retains the PUCCH resource allocation information included in the DL assignment DCI transmitting the first PDSCH resource allocation information or implicitly determined, and only the corresponding HARQ ACK / NACK feedback timing includes HARQ ACK / NACK feedback timing information. The timing re-establishment may be timing gap information between the first PDSCH reception TTI and the HARQ ACK / NACK feedback slot, or timing gap information between the puncturing indication signaling reception TTI and the HARQ ACK / NACK feedback slot.

In another embodiment of the HARQ ACK / NACK reset method using puncturing indication signaling, HARQ ACK / NACK feedback reset information included in the puncturing indication signaling may be PUCCH resource reset information. In this case, the UE maintains HARQ ACK / NACK feedback timing setting information (e.g., timing gap information between PDSCH reception TTI and HARQ ACK / NACK feedback) for PDSCH reception set through DL assignment DCI or higher layer signaling, NACK feedback for the PUCCH resource to be used for HARQ ACK / NACK feedback according to the PUCCH resource reset information included in the corresponding puncturing indication signaling, and sets the PUCCH for the corresponding HARQ ACK / NACK feedback according to the PUCCH resource reset information included in the corresponding puncturing indication signaling. It can be defined to determine resources.

In another embodiment of the HARQ ACK / NACK reset method using puncturing indication signaling, HARQ ACK / NACK feedback reset information included in the corresponding puncturing indication signaling includes both HARQ ACK / NACK feedback timing reset information and PUCCH resource reset information . In this case, as described above, the corresponding UE transmits HARQ ACK / NACK feedback timing setting information for PDSCH reception set through DL assignment DCI or higher layer signaling and PUCCH resource allocation information included in DL assignment DCI or implicitly determined And transmit HARQ ACK / NACK feedback according to HARQ ACK / NACK feedback timing and PUCCH resource reset information included in the puncturing indication signaling.

However, the HARQ ACK / NACK feedback reset related information described in the above-mentioned method 2 is a hybrid of L1 control signaling or UE specific / cell-specific higher layer signaling or higher layer signaling and L1 control signaling in addition to puncturing indication signaling Can be set. For example, the corresponding L1 control signaling may be a PDSCH retransmission DL assignment DCI for transmitting retransmission resource allocation information for a punctured eMBB PDSCH resource.

In addition, the NR base station may define a HARQ ACK / NACK feedback mode for the PDSCH affected by the puncturing. In this case, the base station maintains the existing HARQ ACK / NACK feedback resource allocation information corresponding to Method 1 through UE-specific / cell-specific higher layer signaling or L1 control signaling (e.g., DL assignment DCI or puncturing indication signaling) And whether to reset the HARQ ACK / NACK feedback resource through puncturing indication signaling or separate explicit signaling corresponding to measure 2. Alternatively, HARQ ACK / NACK feedback resetting can be implicitly determined according to the capability of the eMBB UE, HARQ related setting information (e.g., number of HARQ processes), or HARQ feedback timing setting information initially set for the PDSCH.

Point 2: Retransmission for the punctured PDSCH

As shown in FIG. 2, when the first PDSCH transmission is punctured by another urgent second PDSCH transmission, it is necessary to define a retransmission method for the punctured first PDSCH transmission.

1. Autonomous retransmission without ACK / NACK  feedback

As a method for this, the BS can define autonomous retransmission for the first PDSCH transmission without ACK / NACK feedback of the UE.

And may be limited to retransmission of a portion corresponding to the punctured resource of the first PDSCH as a first embodiment of the autonomous retransmission. In this case, the puncturing indication signal may be defined to include resource allocation information (eg, time-frequency resource allocation information, MCS information) for autonomous retransmission, or a separate DCI format for the corresponding autonomous retransmission resource allocation . In this case, in constructing the resource allocation information for the autonomous retransmission, as a method for reducing the overhead, the MCS information is implicitly set to the same MCS as the MCS included in the DL assignment DCI for the first PDSCH Can be defined. In constructing the resource allocation information for the autonomous retransmission, as another method for reducing the overhead, the time-frequency resource allocation can be fixed to the same size as the corresponding punctured resource. That is, the TTI for the autonomous retransmission can be fixed to the TTI of the second PDSCH corresponding to the punctured resource of the punctured resource, and the frequency resource allocation (PRB allocation) can be fixed to the same number as the number of punctured PRBs. In this case, the time-frequency resource allocation information may include time gap information between puncturing indication signaling or DCI format for autonomous retransmission and autonomous retransmission, and information indicating a starting point of a PRB to be allocated for retransmission have.

As a second embodiment of the autonomous retransmission, it can be defined to follow the normal HARQ retransmission procedure through the DL assignment DCI format that is the same as the DL assignment DCI of the first PDSCH regardless of the punctured resource size of the first PDSCH.

Solution 2. ACK / NACK  based retransmission

Alternatively, the retransmission may be defined to be performed according to the ACK / NACK feedback of the first UE. That is, it is possible to define retransmission upon receiving a NACK after receiving a HARQ ACK / NACK feedback from the first terminal according to the HARQ ACK / NACK resource setting scheme described in point 1 above. In this case, the first retransmission is defined to retransmit only the portion corresponding to the punctured resource, similar to the first embodiment of the above-mentioned method 1, and the DL assignment DCI for the first retransmission is defined in the first embodiment of the method 1 It can be defined to be compact as described. As another method, the first retransmission also follows the normal HARQ procedure, and accordingly, the retransmission resource can be defined to be allocated through the DL assignment DCI format of the corresponding re-1 PDSCH.

In addition, when puncturing occurs on a PDSCH, the BS can set the retransmission mode through explicit signaling or implicit signaling. That is, whether to perform NACK-free autonomous retransmission as in method 1, whether to perform retransmission based on ACK / NACK feedback as in method 2, and / or whether to perform retransmission based on the punctured resource of the first PDSCH It is determined whether to retransmit the corresponding part and perform retransmission based on the same resource allocation or perform normal HARQ retransmission based retransmission (i.e., to construct the DL assignment DCI information for the first retransmission allocation in a compact form Whether to be configured through the same DCI format as the DL assignment DCI for the first PDSCH) or jointly. The explicit signaling includes UE-specific / cell-specific higher layer signaling or L1 control signaling (e.g. puncturing indication signaling or DL assignment DCI), and the implicit method includes the UE capability, HARQ ACK / NACK feedback mode setting, and the like.

3 is a diagram illustrating a configuration of a base station according to another embodiment of the present invention.

3, a base station 1000 according to another embodiment includes a control unit 1010, a transmission unit 1020, and a reception unit 1030.

The controller 1010 controls the overall operation of the Node B 1000 according to the downlink HARQ operation method for NR according to the present invention described above.

The transmitting unit 1020 and the receiving unit 1030 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

4 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

4, a user terminal 1100 according to another embodiment includes a receiving unit 1110, a control unit 1120, and a transmitting unit 1130.

The receiving unit 1110 receives downlink control information, data, and messages from the base station through the corresponding channel.

Also, the controller 1120 controls the overall operation of the user terminal 1100 according to the downlink HARQ operation method for NR according to the present invention described above.

The transmitter 1130 transmits uplink control information, data, and a message to the base station through the corresponding channel.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (1)

In a downlink HARQ operation method for NR,
allocating downlink radio resources for data transmission of eMBB or mMTC;
Puncturing some radio resources among the downlink radio resources allocated for the eMBB or mMTC; And
And performing urgent URLLC data transmission / reception using the punctured radio resource.

Images