KR20180115220A - Methods for transmitting and receiving data channel for new radio and Apparatuses thereof - Google Patents

Abstract

Embodiments of the present invention relate to a method for transmitting and receiving a data channel for a next-generation/5G radio access network. An embodiment of the present invention relates to a method for a terminal to transmit and receive a data channel which comprises the steps of: receiving setting information on a code block group (CBG) for retransmission of a data channel from a base station; and receiving downlink control information (DCI) including scheduling information on the data channel from the base station, wherein the DCI includes transmission direction information on the CBG.

Description

TECHNICAL FIELD The present invention relates to a data channel transmission method and apparatus for a next generation wireless network,

The present embodiments propose a data channel transmission / reception method for a next generation / 5G radio access network (hereinafter referred to as NR (New Radio) in the present invention).

3GPP recently approved a study item "Study on New Radio Access Technology" for studying next generation / 5G radio access technology, and based on this, RAN WG1 provides frame structure, channel coding and modulation for NR (New Radio) , Waveforms and multiple access methods. NR is required not only to improve data transmission rate in comparison with LTE / LTE-Advanced, but also to design various requirements that are required according to detailed and specific usage scenarios.

In order to meet the requirements of each scenario, LTE / LTE-Advanced has been proposed as a representative use scenario of NR. In this case, enhancement Mobile BroadBand (MMB), massive Machine Type Communication (MMTC) and Ultra Reliable and Low Latency Communications A flexible frame structure design is required.

In particular, when retransmission is required for a data channel (e.g., PDSCH / PUSCH) of an NR, there is an increasing need for a more efficient retransmission method for reducing resources required for retransmission, unlike LTE in which retransmission is performed in TB units.

It is an object of the present embodiments to provide a retransmission method based on a code block group (CBG) in transmission and reception of a data channel (PDSCH / PUSCH) for a next generation / 5G radio access network.

According to an embodiment of the present invention, there is provided a method of transmitting and receiving a data channel, the method including receiving configuration information for a code block group for retransmission of a data channel from a base station, And receiving the downlink control information from the base station, wherein the downlink control information includes transmission indication information for a code block group.

According to another aspect of the present invention, there is provided a method of transmitting / receiving a data channel in a base station, the method comprising: transmitting configuration information on a code block group for retransmission of a data channel to a mobile station; and transmitting downlink control information including scheduling information on a data channel To the mobile station, and the downlink control information includes transmission indication information for a code block group.

According to another aspect of the present invention, there is provided a terminal for transmitting and receiving a data channel, the terminal for receiving data channel configuration information for retransmission of a data channel from a base station and transmitting downlink control information including scheduling information for the data channel, Wherein the downlink control information includes transmission indication information for a code block group.

In an exemplary embodiment of the present invention, in a base station transmitting and receiving a data channel, configuration information for a code block group for retransmission of a data channel is transmitted to a terminal, downlink control information including scheduling information for a data channel is transmitted to a terminal Wherein the downlink control information includes transmission indication information for a code block group.

According to the present embodiments, a retransmission method based on a code block group (CBG) can be provided when transmitting / receiving a data channel (PDSCH / PUSCH) for the next generation / 5G radio access network.

FIG. 1 illustrates the alignment of OFDM symbols in the case of using different subcarrier spacings according to the present embodiments. Referring to FIG.
2 is a diagram illustrating a procedure in which a terminal transmits and receives a data channel in the present embodiment.
3 is a diagram illustrating a procedure in which a base station transmits and receives a data channel in the present embodiment.
4 is a diagram illustrating a configuration of a base station according to the present embodiments.
FIG. 5 is a diagram illustrating a configuration of a terminal according to the present embodiments.

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 symbols as possible even if 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.

As used herein, a wireless communication system refers to a system for providing 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).

The user terminal is a comprehensive concept that means a terminal in a wireless communication, and it is a comprehensive concept which means a mobile station (MS) in GSM, a mobile station (MS) in UT (User Terminal), a Subscriber Station (SS), 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, a gNode-B, a Low Power Node A sector, a site, various types of antennas, a base transceiver system (BTS), an access point, a point (for example, a transmission point, a reception point, a transmission / reception point) (RRH), a radio unit (RU), and a small cell, as well as a relay cell, a relay node, a megacell, a macrocell, a microcell, a picocell, a femtocell, an RRH,

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. Macro cell, micro cell, picocell, femtocell, small cell, or 2) the wireless region itself in connection with the wireless region. 1), all of the devices that interact to configure the wireless area to be cooperatively controlled by the same entity are all pointed to the base station. A point, a transmission / reception point, a transmission point, a reception point, and the like are examples of the base station according to the configuration method of the radio area. 2 may direct the base station to the wireless region itself to receive or transmit signals at the point of view of the user terminal or in the vicinity of the neighboring base station.

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 a transmission point or a transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

Herein, 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 Do not.

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) .

The time division duplex (TDD) scheme, which is transmitted using different time periods, can be used for the uplink and downlink transmission, and a frequency division duplex (FDD) scheme in which different frequencies are used, a TDD scheme and an FDD scheme A hybrid method can be used.

In the wireless communication system, the uplink and the downlink are configured with reference to one carrier or carrier pair to form a standard.

The uplink and the downlink transmit control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), and the like. The physical downlink shared channel (PDSCH), the physical uplink shared channel (PUSCH) It is composed of the same data channel and transmits data.

A downlink may refer to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink may refer to a communication or communication path from a terminal to a multiple transmission / reception point. At this time, in the downlink, the transmitter may be a part of the multiple transmission / reception points, and the receiver may be a part of the terminal. Also, 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, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

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

The base station performs downlink transmission to the UEs. The base station includes downlink control information, such as scheduling, required for reception of a downlink data channel, which is a primary physical channel for unicast transmission, and physical downlink control information for transmitting scheduling grant information for transmission in an uplink data channel. A control channel can be transmitted. Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

There are no restrictions on multiple access schemes applied in wireless communication systems. (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA) Various multiple access schemes such as OFDM-CDMA can be used. Here, the NOMA includes Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

One embodiment of the present invention relates to asynchronous wireless communications that evolve into LTE / LTE-Advanced, IMT-2020 over GSM, WCDMA, HSPA, and synchronous wireless communications such as CDMA, CDMA- Can be applied.

In this specification, a MTC (Machine Type Communication) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting 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. In this specification, the MTC terminal supports the enhanced coverage over the existing LTE coverage, or the UE category / type defined in the existing 3GPP Release-12 or lower that supports the low power consumption, or the newly defined Release-13 low cost low complexity UE category / type. Or a further Enhanced MTC terminal defined in Release-14.

In this specification, NarrowBand Internet of Things (NB-IoT) terminal means a terminal supporting wireless access for cellular IoT. The objectives of NB-IoT technology include improved indoor coverage, support for large-scale low-rate terminals, low latency sensitivity, ultra-low cost, low power consumption, and optimized network architecture.

Enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC) have been proposed as typical usage scenarios in NR (New Radio), which is under discussion in 3GPP.

In this specification, a frequency, a frame, a subframe, a resource, a resource block, a region, a band, a subband, a control channel, a data channel, a synchronization signal, various reference signals, various signals, May be interpreted as past or presently used meanings or various meanings used in the future.

NR (New Radio)

3GPP recently approved a study item "Study on New Radio Access Technology" for studying next generation / 5G radio access technology. Based on this, 3GPP has developed frame structure, channel coding and modulation, waveform, The discussion on frame structure, channel coding & modulation, waveform & multiple access scheme, etc. has begun.

NR is required to be designed to satisfy not only the improved data transmission rate as compared to LTE / LTE-Advanced, but also various requirements that are required according to granular and specific usage scenarios. In particular, enhancement Mobile BroadBand (eMBB), massive MTC (MMTC) and Ultra Reliable and Low Latency Communications (URLLC) have been proposed as typical usage scenarios of NR, and requirements for each usage scenario have been proposed. It is required to design a flexible frame structure as compared with LTE / LTE-Advanced.

Specifically, eMBB, mMTC, and URLLC are considered as typical usage scenarios of NR that are being discussed in 3GPP. Since each usage scenario has different requirements for data rates, latency, coverage, etc., it is possible to use each frequency band constituting any NR system A radio resource unit based on different numerology (e.g., subcarrier spacing, subframe, TTI, etc.) is efficiently multiplexed as a method for efficiently satisfying requirements according to usage scenarios there is a need for a multiplexing method.

As a method for this, a numerator with different subcarrier spacing (SCS) values is multiplexed on a TDM, FDM or TDM / FDM basis via one NR carrier to support Methods and methods for supporting one or more time units in constructing scheduling units in the time domain have been discussed. In this regard, in the NR, a subframe has been defined as one type of time domain structure, and a reference numerology for defining a corresponding subframe duration has been described. We decided to define a single subframe duration consisting of 14 OFDM symbols of 15 kHz sub-carrier spacing (SCS) based normal CP overhead as LTE. Accordingly, the subframe in the NR has a time duration of 1 ms. However, unlike LTE, the subframe of the NR is an absolute reference duration, which is the time unit on which the actual uplink data scheduling is based, as a slot and a mini-slot ) Can be defined. In this case, the number of OFDM symbols constituting the corresponding slot and the y-value are determined to have a value of y = 14 irrespective of the numerator.

Accordingly, an arbitrary slot may be composed of 14 symbols, and all symbols may be used for DL transmission according to a transmission direction of the slot, or all symbols may be used for uplink transmission UL transmission, or in the form of a DL portion + a gap + an UL portion.

Also, a minislot consisting of fewer symbols than a corresponding slot is defined in an arbitrary numerology (or SCS), and based on this, a time-domain scheduling interval with a short length for transmitting / receiving data upstream / scheduling interval may be set or a long-time time-domain scheduling interval for uplink / downlink data transmission / reception through slot aggregation may be configured.

In particular, for transmission and reception of latency-critical data such as URLLC, a slot of 0.5 ms (7 symbols) or 1 ms (14 symbols) defined in a transmitter-based frame structure having a small SCS value such as 15 kHz It is difficult to satisfy the latency requirement. Therefore, a mini-slot composed of a smaller number of OFDM symbols than the corresponding slot is defined, and a corresponding URLLC And scheduling for latency critical data such as < RTI ID = 0.0 > a < / RTI >

Alternatively, as described above, multiplexers supporting different SCS values in one NR carrier are multiplexed and supported by the TDM scheme or the FDM scheme, so that the number of slots (or mini- Scheduling of data in accordance with latency requirements 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.

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

NR PDSCH / PUSCH  TB, CB, CBG  Configuration

In the existing LTE system, when a PDSCH / PUSCH resource is allocated for an arbitrary DL / UL data transmission, the TBS (Transport Block Size) through which the PDSCH / PUSCH is transmitted is determined by MCS and RB (Resource Block) allocation information do. When the TB is determined, the TB is segmented into a plurality of CBs according to a maximum CB (code block) size for encoding, and the CRC is attached and encoded in the corresponding CB units. Mapping is performed for PDSCH / PUSCH resources. On the other hand, the HARQ ACK / NACK feedback and retransmission for an arbitrary PDSCH / PUSCH are performed in TB units.

In NR, especially in case of eMBB, since it is required to support larger TBS compared to LTE, the number of CBs constituting one TB can be drastically increased according to the maximum CB size definition. Therefore, it is necessary to further subdivide the HARQ ACK / NACK feedback and retransmission units for one TB, and a CBG (Code Block Group) is formed by grouping one or more CBs so that the CBG-based HARQ ACK / NACK feedback and retransmission A need is being sought.

The embodiments described below may be applied to a terminal, a base station, and a core network entity (MME) using all mobile communication technologies. For example, the present embodiments can be applied not only to mobile communication terminals to which LTE technology is applied but also to next generation mobile communication (5G mobile communication, New-RAT) terminals, base stations, and access and mobility functions (AMFs). For convenience of explanation, the base station may denote an eNB of an LTE / E-UTRAN or a base station (CU, DU, or CU and DU) in a 5G wireless network in which a CU (Central Unit) An entity implemented as a single logical entity), or gNB.

Numerology described herein refers to numerical characteristics and numerical values related to data transmission and reception, and may be determined by the value of subcarrier spacing (hereinafter also referred to as SCS or Subcarrier Spacing) . Hence, different numerology may mean that the subcarrier spacing that determines the numerology is different.

In this specification, the slot length may be expressed by the number of OFDM symbols constituting the slot, or may be represented by the time occupied by the slot. For example, when a spreader based on SCS of 15 kHz is used, the length of one slot may be represented by 14 OFDM symbols and may be expressed by 1 ms.

In this specification, a data channel may mean a downlink data channel (PDSCH) or an uplink data channel (PUSCH). A method of transmitting and receiving a data channel may refer to a method in which a terminal receives a downlink data channel (PDSCH) from a base station or a method in which a terminal transmits an uplink data channel (PUSCH) to a base station.

Hereinafter, a more specific embodiment of a method of transmitting and receiving a data channel between a terminal and a base station will be described in detail.

The embodiments described below may be applied individually or in any combination.

Example  1. Code block group for downlink data transmission ( CBG , code block group) based retransmission method

The present embodiment proposes concrete downlink control information configuration and transmission / reception method for CBG-based retransmission when a code block group (CBG) -based HARQ operation is applied as described above.

For convenience of description, the present invention assumes that an initial PDSCH transmission is composed of N CBGs for an HARQ process number (or HARQ process ID). However, the present embodiment can be applied regardless of the number of CBGs constituting the initial PDSCH transmission, the concrete value of N, or a specific method of setting N. [

Example  1-1. Explicitly for retransmissions CBG  Instruction to direct

As described above, when an initial PDSCH transmission is composed of N CBGs (e.g., CBG # 0, CBG # 1, ...), a transmission block (TB) ., CBG # (N-1)), the UE can define to transmit HARQ ACK / NACK feedback information for each CBG through the PUCCH. If a NACK occurs for any of the M CBGs, the BS can define retransmission through the PDSCH only for the M CBGs.

Specifically, the BS may define retransmission of the M CBGs through a single PDSCH transmission resource allocation in order to retransmit the corresponding M CBGs that failed to decode in the UE. That is, the BS transmits a single DC assignment DCI for retransmission of the M CBGs, and a single PDSCH for retransmission of the corresponding M CBGs through the corresponding DL assignment DCI. Transmission resource allocation information can be defined to be transmitted. At this time, the DL assignment DCI format for the retransmission includes the explicit indication information about the CBG in which the retransmission is performed through the corresponding PDSCH. Specifically, a DL assignment DCI format for initial PDSCH transmission and a DL assignment DCI format for separate retransmission are defined to include the corresponding CBG indication information, Alternatively, it is possible to define that some information area of the existing DL assignment DCI is used as an information area for the corresponding CBG indication.

Or DL assignment When constructing the DCI format, considering the code block group based transmission / retransmission, the initial transmission and the retransmission are the same for the initial transmission and the retransmission. A DL assignment DCI format is defined and a DL assignment DCI format for allocating an initial PDSCH transmission resource and a DL allocation for a CBG based PDSCH retransmission DL assignment DCI format.

At this time, as a method of constructing information for indicating a CBG to be retransmitted, the CBG indication information may be bitmap information for each of the N CBGs configured by the initial PDSCH transmission. That is, when an NR base station configures a DL assignment DCI format for retransmission according to the number N of CBGs set for PDSCH transmission for each UE or for each PDSCH transmission, Map-based CBG indication information area. That is, when NACK is reported from the UE to M CBGs (M <= N) in the initial PDSCH transmission composed of N CBGs as described above, DL assignment Assignment of directive information for CBG that retransmission is performed through PDSCH by corresponding DL assignment DCI among corresponding M CBGs through DCI is explicitly set based on bitmap, To be transmitted to the terminal.

DL allocation for retransmission The bitmap configuration for CBG indication in the DCI format is always based on the number of CBGs N configured in the initial PDSCH transmission for the corresponding HARQ process number , Or in the case of second, third,... Retransmission after the first retransmission, a bitmap information area for the corresponding CBG indication is configured according to the number of CBGs configured in the immediately preceding PDSCH (re-transmission) . That is, in the above-described example, when NACKs are again reported for L CBGs (L < = M) among the M CBGs retransmitted through the first retransmission, DL Assignment The bitmap for CBG indication information configuration of the DCI can be defined to be composed of M bits according to the value of M, which is the number of CBGs transmitted through the previous PDSCH retransmission.

However, in constructing an arbitrary DL assignment DCI format as described above, PDSCH for the initial PDSCH transmission may be performed according to the number N of CBGs defined for PDSCH retransmission of the UE, DL assignment for resource allocation When a DCI format and DL assignment DCI format for PDSCH resource allocation for CBG retransmission are defined to be identical, the corresponding CBG-based retransmission is performed The DL assignment DCI format for initial PDSCH transmission resource allocation as well as the DL assignment DCI format including the PDSCH resource allocation information for the PDSCH resource allocation may be N And a bitmap information area composed of bits. In this case, when allocating a resource for initial PDSCH transmission, the base station allocates a bitmap information area of the corresponding N bits of the DL assignment DCI format to a specific value (e.g., all '0' All &quot; 1 &quot;).

As another method for defining the DL assignment DCI format and the DL assignment DCI format for retransmission to be identical identical for the initial PDSCH transmission, (Re-transmission) based on the PDSCH for the UE of the DCI, the size of the CBG indication information area of the DL assignment DCI of the corresponding terminal, that is, The number of bits and the Q value of the bitmap information area for the instruction are set so as to perform UE-specific or cell-specific higher layer signaling And transmits the HARQ process number to a corresponding HARQ process number regardless of whether the initial PDSCH transmission or retransmission is performed. DL assignment including the configured CBG instruction information area (DL assignment) can be defined to receive a DCI format.

If a code block group (re) transmission (transmission) is set for a PDSCH of an arbitrary terminal by a base station / network, a UE-specific or cell- the size of the HARQ ACK / NACK feedback information on the PUCCH or PUSCH of the corresponding UE according to the bitmap size Q of the CBG indication information area set through higher layer signaling (e.g., HARQ ACK / NACK The number of feedback bits) can also be determined. In this manner, when the CBG-based PDSCH (Re) transmission is set for a certain UE, the size of the CBG indication information area of the DL assignment DCI for that UE is UE-specific or cell- cell-specific higher layer signaling, the number of CBGs constituting a transport block (TB) transmitted through an arbitrary PDSCH for a corresponding UE, PDSCH may be indicated through the CBG indication information region included in the DL assignment DCI that transmits resource allocation information for initial transmission of the PDSCH.

That is, unlike the method of determining the size of the bitmap for the CBG indication included in the DL assignment DCI for the corresponding UE according to the number and N of CBGs already determined as described above, A bitmap size and a Q value of a CBG indication information area to be included in a DL assignment DCI through UE-specific or cell-specific higher layer signaling The number of CBGs constituting the TB transmitted through the corresponding PDSCH and the N value are defined as DL assignment DCI for initial PDSCH transmission, And the bitmap information area for the CBG indication included in the bitmap information area.

Specifically, a mapping method between a CBG constituting a TB transmitted through an arbitrary PDSCH and a bitmap constituting a CBG indication information region included in a DL assignment DCI including corresponding PDSCH (Re) transmission resource allocation information (LSB (Least Significant Bit) to MSB (Most Significant Bit) of the bitmap constituting the corresponding CBG indication information area) in order from the lowest CBG index constituting the corresponding TB in the order of 1: 1 .

In setting a bitmap constituting the CBG indication information area of the DL assignment DCI in the base station / network, the CBG transmitted through the PDSCH allocated by the corresponding DL assignment DCI is referred to as' 1 'for CBG, and' 0 'for non-transmitted CBG. In this case, a DL assignment DCI for an initial PDSCH transmission resource allocation for an arbitrary TB, that is, an initial PDSCH transmission for a certain HARQ process number (HARQ process number) ) When setting the bit map constituting the CBG indication information area of the DL DCI, if the number of CBGs for the corresponding TB is N in the base station / network, the corresponding CBG indication bit map 1 &quot; for consecutive N bits from the LSB of the LSB, and '0' for the remaining bits. Accordingly, the UE defines the CBs to CBG # 0 to CBG # (N-1) as N CBGs for the TBs transmitted through the initial PDSCH transmission of the HARQ process number .

Or a CBG indicating bitmap included in a DL assignment DCI, which is transmitted through a PDSCH, and a CBG indicating bitmap included in a DL assignment DCI, (DL) for allocation of an initial PDSCH transmission resource to an arbitrary TB when defining a mapping from the MSB to the LSB of the bitmap constituting the corresponding CBG indication information area in the order of 1: In setting a bitmap constituting a CBG indication information area of a DCI, i.e., a DL assignment DCI for an initial PDSCH transmission for an HARQ process number, , And if the number of CBGs for the corresponding TB is N in the base station / network, N bits of consecutive N bits are set to '1' from the MSB of the corresponding CBG indication bitmap, If the merge bits can be defined to be set to '0'. Accordingly, the UE defines the CBs to CBG # 0 to CBG # (N-1) as N CBGs for the TBs transmitted through the initial PDSCH transmission of the HARQ process number .

For example, if the bitmap size for the corresponding CBG indication is set to Q bits through UE-specific or cell-specific higher layer signaling, DL assignment for resource allocation of the initial PDSCH transmission for the UE In the bitmap of the Q bit for indicating the CBG included in the DCI, consecutive bits from the LSB or MSB are set to '1' The number N of CBGs constituting the corresponding TB (where N < = Q) can be determined according to the number of bits.

In contrast, in setting a bitmap constituting the CBG indication information area of the DL assignment DCI in the base station / network, the CBG transmitted through the PDSCH allocated by the corresponding DL assignment DCI may be referred to as' 0 ', and when it is defined to indicate' 1 'for the CBG that is not transmitted, DL assignment for initial PDSCH transmission resource allocation for the corresponding UE. The number N of CBGs constituting the TB (N <= Q) can be defined to be determined by the number of bits set to '0' successively from the LSB or MSB in the bitmap of the corresponding Q bit for the instruction have. In this case, when a CBG-based PDSCH retransmission is instructed for the corresponding TB, that is, when a DL assignment DCI indicating a retransmission for the corresponding TB is transmitted by the base station / network, DL assignment In interpreting the CBG indication bitmap information area of the Q bits included in the DCI, the number of CBGs corresponding to the number CBG of the CBGs constituting the corresponding TB indicated at the time of initial PDSCH transmission (initial PDSCH transmission) It can be defined to interpret as significant retransmission CBG indication information only for consecutive N bits from the LSB of the indication bitmap or consecutive N bits from the MSB.

Alternatively, retransmission may be defined to be performed by allocating a separate PDSCH for each CBG. That is, when retransmission of M CBGs is required for N CBGs configured through initial PDSCH transmission, a separate PDSCH resource allocation for retransmission may be performed for each CBG. At this time, the DL assignment DCI for each CBG retransmission can be defined to include a single CBG indication information to be retransmitted on the PDSCH allocated through the corresponding DL assignment DCI. The CBG indication information may be CBG index information configured according to the number of CBGs configured through the initial PDSCH transmission. That is, in the above example, if the initial PDSCH transmission for an HARQ process number is composed of N CBGs, each CBG is indexed from CBG # 0 to # (N-1) Accordingly, the base station allocates a separate PDSCH resource for each CBG to the CBG for which NACK reporting is performed from the UE. Accordingly, the DL assignment DCI format including the PDSCH resource allocation information for each CBG retransmits the index information of the CBG through which the retransmission is performed through the PDSCH allocated through the corresponding DL assignment DCI It can be defined to include an information area for direct indication. That is, when NACKs for M CBGs are reported among N CBGs as described above, the base station transmits M DL assignment DCIs for each CBG retransmission, and accordingly, M PDSCHs Resource allocation is performed, and retransmission is performed for each CBG individually through each PDSCH transmission.

However, in the DL assignment DCI format configuration for an arbitrary PDSCH transmission mode, retransmission mode setting information (e.g., TB-based retransmission, or CBG- (bitmap or CBG index indication information) is included in the DL assignment DCI format for the initial PDSCH transmission or the PDSCH retransmission according to the setting of the retransmission control information Can be defined. In the case of the DCI format for a terminal for which a CBG-based retransmission mode is set according to the retransmission mode setting information of the corresponding terminal in a DL assignment DCI format configuration for an arbitrary terminal, And a DL assignment DCI format that does not include CBG related indication information is defined in the DCI format for a terminal in which a TB-based retransmission mode is set. format is defined and transmitted. In the case of a UE, in monitoring a DL assignment DCI format, in the case of a UE having a CBG-based retransmission mode, monitoring based on DL assignment DCI format including CBG related indication is performed And to perform monitoring based on a DL assignment DCI format that does not include CBG related indication information in the case of a UE having a TB-based retransmission mode set therein.

Example  1-2. For implicit retransmission CBG  Instruction to direct

The base station does not include the explicit indication information on the CBG in which the retransmission is performed at the time of DL assignment DCI transmission including PDSCH resource allocation information for retransmission for an initial PDSCH transmission Can be defined.

In this case, the CBG configuration method for any PDSCH retransmission does not follow the CBG configuration rule determined by the CBG number, N value, or transmission block size (TBS) set for the PDSCH transmission of the UE, It can be defined to be composed of M CBGs required for retransmission among CBGs configured by transmission. That is, all the CBG configuration rules defined in the NR, for example, the number of CBGs for the PDSCH or the number of CBs configuring the CBG for each UE are set through higher layer signaling, or the CBG configuration rule Is defined, it can be defined to apply only to the initial PDSCH transmission, and for retransmission, it can be defined to configure the retransmission TB based on the CBG configured in the initial transmission.

Accordingly, when N CBGs for M CBGs configured through the initial PDSCH transmission (initial PDSCH transmission) are reported from the UE, the Node B allocates a PDSCH resource allocation for retransmission of the corresponding M CBGs (UE-transparent) manner, i.e., in the same DCI format as the DL assignment DCI for the first PDSCH, and the UE retransmits the corresponding PDSCH in the first PDSCH, It is possible to define that the PDSCH retransmission for M CBGs that have performed NACK reporting on the initial PDSCH transmission of the HARQ process number is implicitly expected. Likewise, in the case of retransmission of the second, third, ..., i.e., in the case of an arbitrary k-th retransmission, the CBG is configured to report a NACK to the CBG constituting the PDSCH transmitted (k- It can be defined to be implicitly expected.

In addition, the UE may transmit the CBG indication information (e.g., CBG-specific bitmap indication information or CBG index indication information) instructed in the DL assignment DCI for retransmission or the DL assignment DCI for the corresponding retransmission (ACK-to-NACK or ACK-to-NACK) for the ACK / NACK feedback of the UE for the previous PDSCH transmission based on the TBS derived from the indicated or the modulation and coding scheme (MCS) NACK-to-ACK reception error).

That is, in the former case, if the CBG indication information explicitly indicated through the DL assignment DCI is different from the CBG in which the NACK reporting is performed in the UE, the UE transmits HARQ ACK / NACK feedback It can be determined that a reception error has occurred. In the latter case, the UE transmits a total CBG size (i.e., a CBG (NACK) reporting a NACK from the corresponding terminal to the TBS indicated by the DL assignment DCI from the base station for retransmission from the base station, (I.e., greater than or equal to) the TBS value, or to expect the corresponding TBS value to be set as a function of the total CBG size, and if so, If the TBS is different from the TBS setup value expected from the UE, the UE can define that the HARQ ACK / NACK feedback error has occurred. Accordingly, if it is determined that a HARQ ACK / NACK feedback error has occurred in the UE for the previous PDSCH transmission, the UE does not transmit the HARQ ACK / NACK feedback for the retransmission (DTX) To be reported. When the base station detects a DTX in the PUCCH resource allocated for HARQ ACK / NACK feedback of the UE for the retransmission, the base station determines that an HARQ ACK / NACK feedback reception error has occurred for the previous PDSCH transmission and generates a corresponding HARQ process number number of TBs (or CBGs) of the HARQ retransmission.

Or CBG for CBG identification, the CRC is defined to be scrambled based on the corresponding CBG index, and through the retransmission CBG identification and the HARQ ACK for the previous PDSCH transmission / NACK feedback error.

In addition, as a method for reducing the complexity of blind decoding of a terminal in transmitting a DL assignment DCI for retransmission, a DC assignment (DL assignment) A control resource set or a search space for monitoring may be limited. For example, a single mini-slot after a certain point from a mini-slot, a slot, a subframe (e.g., index #n) in which HARQ ACK / Slot, slot, subframe # (n + k) on the basis of a window, or to transmit and receive a DL assignment DCI for a corresponding retransmission through a subframe (e.g., index # n + 1) to # (n + k) to transmit and receive a DL assignment DCI for the corresponding retransmission. However, the k value may be fixed to any value, or may be derived as a function of the transmission numerology or as a function of TTI length, or UE-specific / cell-specific ) May be set via higher layer signaling.

Example  2. For uplink data transmission CBG  Based retransmission method

Hereinafter, a CBG-based ACK / NACK feedback scheme for the uplink data channel PUSCH and a DCI formatting scheme for CBG-based PUSCH retransmission are proposed.

For convenience of description, this embodiment assumes that the initial PUSCH transmission is composed of N CBGs for an HARQ process number (or HARQ process ID). However, the present embodiment can be applied regardless of the number of CBGs constituting the initial PUSCH transmission, a concrete value of N, or a specific method of setting N. [

Example  2-1. Separate ACK / NACK  Implicit through UL grants without feedback ACK / NACK  Feedback and CBG  Based PUSCH  retransmission resource allocation scheme

When the TB transmitted through the PUSCH is composed of N CBGs (eg, CBG # 0, CBG # 1, ..., CBG # (N-1)) for an initial PUSCH transmission as described above, 1), the BS transmits HARQ ACK / NACK indication information for the N CBGs transmitted through the PUSCH and / or UL grant information for retransmission to the CBG in which the NACK occurs, It needs to be transmitted through. In this case, when a NACK occurs for an arbitrary CBG, the BS can implicitly define a NACK indication for the PUSCH transmission of the UE by transmitting an UL grant for retransmission to the CBG have.

Specifically, when the base station fails to decode M CBGs out of N CBGs transmitted from the UE to the base station through an initial PUSCH transmission, the base station transmits a UL for retransmission of the corresponding M CBGs grant can be implicitly defined to indicate HARQ ACK / NACK for the PUSCH transmission of the corresponding UE. At this time, when constructing the corresponding UL grant DCI format to indicate the M CBGs that failed to decode at the base station through the UL grant, similar to the PDSCH case described in the first embodiment It can be defined to include explicit indication information about the CBG. Specifically, a UL grant (UL grant) DCI format for initial PUSCH transmission and a UL grant DCI format for retransmission are defined to include the corresponding CBG indication information, UL Grant (UL grant) It is possible to define that some information area of DCI is used as information area for CBG indication. Or an UL grant DCI format, an identical UL grant DCI format for initial transmission and retransmission, considering a code block group based transmission / retransmission, And it can be defined to apply to both the UL grant DCI format for initial PUSCH transmission resource allocation and the UL grant DCI format for CBG based PUSCH retransmission.

At this time, as a method of constructing the retransmission CBG indication information, the CBG indication information may be N pieces of bit map information per CBG configured by the initial PUSCH transmission. In other words, any NR base station may configure the UL grant DCI format for retransmission according to the number N of the CBGs configured for PUSCH transmission for each UE or for each PUSCH transmission, It can be defined to include a bitmap-based CBG indication information area. That is, if the base station fails to decode M CBGs (M < = N) in the initial PUSCH transmission composed of N CBGs as described above, the base station transmits UL Grant for retransmission ) It is possible to define that the indication information of the corresponding M CBGs through the DCI is explicitly set on the basis of the bitmap and transmitted to the corresponding UE.

However, the bitmap configuration for CBG indication in the UL grant DCI format for retransmission may be defined to consist of N bits at all times according to the number N of CBGs configured for PUSCH transmission of the corresponding terminal, The bitmap information area for CBG indication can be configured according to the number of CBGs transmitted through the immediately preceding PUSCH (re) transmission. That is, in the above-described example, if the base station fails to decode L CBGs (L < = M) out of M CBGs retransmitted through the first retransmission, the UL grant for corresponding L CBG retransmissions ) In the DCI configuration, the bitmap information area for indicating the retransmission CBG can be defined to be composed of M bits according to the value of M, which is the number of CBGs transmitted through the previous PUSCH retransmission.

However, in constructing an arbitrary UL grant DCI format, a UL for PUSCH resource allocation for the initial PUSCH transmission is selected according to the number N of CBGs defined for the PUSCH transmission of the corresponding terminal. The UL Grant DCI format for grant and the UL grant DCI format for PUSCH resource allocation for CBG retransmission can be defined to be identical. The UL Grant DCI format for initial PUSCH transmission resource allocation as well as the UL grant DCI format including the information includes information on the bit map information area . At this time, when allocating a resource for initial PUSCH transmission, the base station allocates a bit map information area of N bits in the UL grant DCI format to a specific value (e.g., all '0' or all ' 1 ') to be transmitted.

As another method for defining the DCI format for the initial PUSCH transmission and the UL grant DCI format for retransmission to be identical to each other, When a code block group based (re) transmission is set for the PUSCH for the UL grant, the size of the CB grant indication information area of the UL grant of the corresponding terminal, that is, Specific number of bits and a Q value to transmit to a corresponding UE through UE-specific or cell-specific higher layer signaling , The UE transmits a UL (UL) HARQ process number including a CBG indication information area composed of a bit map of Q bits at all times irrespective of initial PUSCH transmission or retransmission for an HARQ process number. Cooling Water can be defined to receive (UL grant).

When the CBG-based PUSCH (retransmission) transmission for an arbitrary terminal is set up, the size of the CBG indication information area of the UL grant for the corresponding terminal is UE-specific or cell- the number of CBGs constituting a TB to be transmitted through an arbitrary PUSCH for a corresponding UE and N is the number of CBGs to be transmitted through the initial transmission of the corresponding PUSCH may be indicated through a CBG indication information region included in an UL grant (UL grant) for transmitting resource allocation information for initial transmission. That is, unlike the method of determining the size of the bit map indicating the CBG included in the UL grant (UL grant) for the corresponding UE according to the number of already determined CBGs and the N value, A Q value which is a bitmap size of a CBG indication information area to be included in an UL grant (UL grant) is set through a UE-specific or cell-specific higher layer signaling , An arbitrary PUSCH transmission for the UE, i.e., the number of CBGs constituting the TB transmitted through the corresponding PUSCH, and the N value indicates the CBG of the UL grant for the initial PUSCH transmission It can be defined to be set through the bitmap information area.

Specifically, a mapping method between a CBG constituting a TB transmitted through an arbitrary PUSCH and a bitmap constituting a CBG indication information region included in an UL grant (UL grant) including the PUSCH (re) transmission resource allocation information, (Least significant bit) to least significant bit (LSB) of the bitmap constituting the CBG indication information area sequentially from the lowest CBG index constituting the corresponding TB in order of 1: 1 can do.

In setting the bitmap constituting the CBG instruction information area of the UL grant in the base station / network, the CBG transmitted through the PUSCH allocated by the UL grant (UL grant) is designated as '1' , And '0' for CBG that is not transmitted. In this case, a UL grant for an initial PUSCH transmission resource allocation for an arbitrary TB, that is, an initial grant for an initial PUSCH transmission for an HARQ process number, When setting the bit map constituting the CBG instruction information area of the UL grant (UL grant), when designating the number of CBGs for the TB in the base station / network to be N, It can be defined to be set to '1' for N bits and '0' for the remaining bits. Accordingly, the UE is defined to group CBG # 0 to CBG # (N-1) into N CBGs for the TB transmitted through the initial PUSCH transmission of the corresponding HARQ process number (HARQ process number) .

Or a CBG indicating bitmap included in an UL grant (UL grant), which is transmitted through an arbitrary PUSCH, and a CBG indicating bitmap included in an UL grant, (UL grant) for allocation of an initial PUSCH transmission resource to an arbitrary TB in the case of defining 1: 1 in the order of MSB to LSB of the bitmap constituting the CBG indication information area, That is, a bit map constituting a CBG indication information area of an UL grant (UL grant) for an initial PUSCH transmission of an HARQ process number, When designating the number of CBGs for TB to be N, set '1' for consecutive N bits from the MSB of the corresponding CBG indication bitmap, and set '0' for the remaining bits. Can. Accordingly, the UE is defined to group CBG # 0 to CBG # (N-1) into N CBGs for the TB transmitted through the initial PUSCH transmission of the corresponding HARQ process number (HARQ process number) .

For example, when the bitmap size for indicating a corresponding CBG is set to Q bits through the UE-specific or cell-specific higher layer signaling, Initial PUSCH Transmission for a Terminal In a bitmap of Q bits for indicating a CBG included in UL grant for resource allocation, a bit set to '1' consecutively starting from LSB or MSB The number N of CBGs constituting the corresponding TB (where N < = Q) can be defined to be determined according to the number.

Alternatively, in setting the bit map constituting the CBG instruction information area of the UL grant in the base station / network, the CBG transmitted through the PUSCH allocated by the UL grant (UL grant) is set to '0' And the corresponding Q bits for the CBG indication included in the UL grant (UL grant) for initial PUSCH transmission resource allocation for the corresponding UE are defined to indicate '1' for the CBG that is not transmitted, The number of CBGs constituting the corresponding TB (N &lt; = Q) may be determined according to the number of consecutive bits set to '0' starting from LSB or MSB in the bitmap of the TB. In this case, when a CBG-based PUSCH retransmission is instructed for the corresponding TB, that is, when a UL grant indicating retransmission for the TB is transmitted by the base station / network, in the bit map information area indicating the CBG of the Q bits included in the corresponding TBs, the corresponding CBG is indicated according to the value N of the CBGs constituting the corresponding TB indicated at the time of the initial PUSCH transmission It can be defined to be interpreted as meaningful retransmission CBG indication information only for consecutive N bits from the LSB of the bitmap or consecutive N bits from the MSB.

Alternatively, the retransmission may be defined to be performed by allocating a separate PUSCH for each CBG. That is, when retransmission of M CBGs among the N CBGs configured through the initial PUSCH transmission is requested, a separate PUSCH resource allocation for retransmission may be performed for each CBG. At this time, the UL grant DCI for retransmission of the corresponding CBG can be defined to include a single CBG indication information to be retransmitted through the PUSCH transmission allocated through the UL grant DCI. The CBG indication information may be each CBG index information configured according to the number of CBGs configured through the initial PUSCH transmission. That is, in the above example, when the initial PUSCH transmission is composed of N CBGs for an HARQ process number, each CBG is divided into CBG # 0 to # (N-1) Indexing can be performed. Therefore, the base station allocates PUSCH resources for separate CBG for each CBG to the CBG that failed in decoding in the base station. Accordingly, the UL grant DCI format including the PUSCH resource allocation information for each CBG retransmits the index information of the CBG, which is retransmitted through the PUSCH allocated through the corresponding UL grant DCI, And an information area for storing the information. That is, if decoding fails for M CBGs among N CBGs as described in the above example, the base station transmits M UL grant DCIs for each CBG retransmission, and accordingly, M PUSCH resource allocations And retransmission is performed for each CBG individually through each PUSCH transmission.

However, when constructing an UL Grant DCI format for an arbitrary PUSCH transmission mode, retransmission mode setting information (e.g., TB-based retransmission, etc., code block group based retransmission (CBG (bit map or CBG index indication information) in the UL grant DCI format for the initial PUSCH transmission or the PUSCH retransmission is determined according to the BS-related retransmission . In the case of a DCI format for a terminal in which a CBG-based retransmission mode is set according to the retransmission mode setting information of the corresponding terminal, when the UL grant DCI format for an arbitrary terminal is configured by the base station, In the case of the DCI format for a terminal in which a TB-based retransmission mode is set, a UL grant DCI format that does not include CBG-related indication information is defined. Can be defined to be transmitted. In the case of a UE having a CBG-based retransmission mode in monitoring the UL grant DCI format in the case of the UE, monitoring is performed based on UL grant DCI format including CBG-related indication information, Based retransmission mode, the UE can be defined to perform monitoring based on an UL grant DCI format that does not include CBG related indication information.

In addition, in transmitting the UL Grant DCI for retransmission, the UL Grant DCI for retransmission may be used as a method for reducing the complexity of blind decoding of the UE. A control resource set or a search space for monitoring may be limited. For example, the HARQ process number may be transmitted from a mini-slot, a slot, a subframe (eg, index #n), or the like, in which a previous PUSCH transmission of the UE has been performed for the corresponding HARQ process number Slots, subframes (eg index # (n + k)) from a certain point in time from a mini-slot, slot, subframe (eg index #n) Slots or subframes # (n + 1) to # (n + k) on the basis of a window on the basis of the UL grant for transmitting the UL grant for the retransmission The UL Grant DCI for the retransmission may be transmitted and received. However, the value of k may be fixed to a certain value or may be derived as a function of transmission numerology or as a function of TTI length, or a UE-specific / cell-specific And may be set through higher layer signaling.

2 is a diagram illustrating a procedure in which a terminal transmits and receives a data channel in the present embodiment.

Referring to FIG. 2, the MS may receive configuration information for a code block group for retransmission of a data channel from a BS (S200). At this time, the setting information for the code block group may include information indicating the maximum number of code block groups per transport block. The UE can receive information indicating the maximum number of code block groups per such transport block from the base station through upper layer signaling (e.g., RRC signaling).

In addition, the UE may receive downlink control information (DCI) including scheduling information on a data channel from the Node B (S210). At this time, the downlink control information may include transmission indication information for a code block group for retransmission of a data channel.

The transmission instruction information for the code block group may be indicated as a bitmap composed of bits corresponding to the number of maximum code block groups per transmission block, which is information included in the setting information for the code block group received in operation S200. For example, the maximum number of code block groups per transmission block may be determined to be one of 2, 4, 6, and 8, and thus the bit number of the bitmap may be determined to be one of 2, 4,

At this time, as an example of how each bit of the bitmap constituting the transmission instruction information for the code block group is set, each bit of the corresponding bitmap is set such that the code block group indicated by the bit corresponds to the above- 1 &quot;, and may be set to '0' if the code block group indicated by each bit is not transmitted through the above-mentioned data channel.

The downlink control information may further include flushing indication information for a code block group for retransmission of a data channel. As an example in which the flushing instruction information is indicated, the flushing instruction information may be indicated by 1 bit. If the 1-bit flushing instruction information indicates that the retransmission for an arbitrary code block group is instructed through the DL assignment DCI format based on the code block group (i.e., the transmission instruction information for the code block group Is set to '0' if the data stored in the soft buffer of the terminal corresponding to the code block group is valid, and if the data stored in the soft buffer of the terminal corresponding to the code block group is valid The UE determines whether to combine the data stored in the soft buffer with the retransmitted data when decoding the data of the code block group in which the UE retransmits the data. Can be defined.

3 is a diagram illustrating a procedure in which a base station transmits and receives a data channel in the present embodiment.

Referring to FIG. 3, the base station can transmit configuration information on a code block group for retransmission of a data channel to the terminal (S300). At this time, the setting information for the code block group may include information indicating the maximum number of code block groups per transport block. The base station can transmit information indicating the maximum number of code block groups per transmission block to the UE through an upper layer signaling (e.g., RRC signaling).

In addition, the base station may transmit downlink control information (DCI) including scheduling information on the data channel to the terminal (S310). At this time, the downlink control information may include transmission indication information for a code block group for retransmission of a data channel.

The transmission instruction information for the code block group may be indicated by a bitmap consisting of bits as many as the maximum number of code block groups per transmission block, which is information included in the setting information for the code block group transmitted in step S300. For example, the maximum number of code block groups per transmission block may be determined to be one of 2, 4, 6, and 8, and thus the bit number of the bitmap may be determined to be one of 2, 4,

At this time, as an example of how each bit of the bitmap constituting the transmission instruction information for the code block group is set, each bit of the corresponding bitmap is set such that the code block group indicated by the bit corresponds to the above- 1 &quot;, and may be set to '0' if the code block group indicated by each bit is not transmitted through the above-mentioned data channel.

The downlink control information may further include flushing indication information for a code block group for retransmission of a data channel. As an example in which the flushing instruction information is indicated, the flushing instruction information may be indicated by 1 bit. If the 1-bit flushing instruction information indicates that the retransmission for an arbitrary code block group is instructed through the DL assignment DCI format based on the code block group (i.e., the transmission instruction information for the code block group Is set to '0' if the data stored in the soft buffer of the terminal corresponding to the code block group is valid, and if the data stored in the soft buffer of the terminal corresponding to the code block group is valid The UE determines whether to combine the data stored in the soft buffer with the retransmitted data when decoding the data of the code block group in which the UE retransmits the data. Can be defined.

4 is a diagram illustrating a configuration of a base station according to the present embodiments.

4, the base station 400 includes a controller 410, a transmitter 420, and a receiver 430.

The control unit 410 may control the overall operation of the base station to transmit and receive data channels.

The transmitting unit 420 and the receiving unit 430 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

Specifically, the transmitter 420 transmits configuration information on a code block group (CBG) for retransmission of a data channel to the UE, and transmits downlink control information including scheduling information on the data channel to the UE .

In this case, as described above, the setting information for the code block group may include information indicating the number of the maximum code block groups per transport block, and the base station may transmit the upper layer signaling (e.g., RRC signaling) Information indicating the maximum number of code block groups can be transmitted to the terminal. In addition, the downlink control information may include transmission indication information for a code block group for retransmission of a data channel.

The transmission instruction information for the code block group may be indicated by a bitmap composed of bits as many as the maximum number of code block groups per transmission block, which is information included in the setting information for the transmitted code block group. For example, the maximum number of code block groups per transmission block may be determined to be one of 2, 4, 6, and 8, and thus the bit number of the bitmap may be determined to be one of 2, 4,

At this time, as an example of how each bit of the bitmap constituting the transmission instruction information for the code block group is set, each bit of the corresponding bitmap is set such that the code block group indicated by the bit corresponds to the above- 1 &quot;, and may be set to '0' if the code block group indicated by each bit is not transmitted through the above-mentioned data channel.

The downlink control information may further include flushing indication information for a code block group for retransmission of a data channel. As an example in which the flushing instruction information is indicated, the flushing instruction information may be indicated by 1 bit. If the 1-bit flushing instruction information indicates that the retransmission for an arbitrary code block group is instructed through the DL assignment DCI format based on the code block group (i.e., the transmission instruction information for the code block group Is set to '0' if the data stored in the soft buffer of the terminal corresponding to the code block group is valid, and if the data stored in the soft buffer of the terminal corresponding to the code block group is valid The UE determines whether to combine the data stored in the soft buffer with the retransmitted data when decoding the data of the code block group in which the UE retransmits the data. Can be defined.

FIG. 5 is a diagram illustrating a configuration of a terminal according to the present embodiments.

5, the terminal 500 includes a receiving unit 510, a control unit 520, and a transmitting unit 530.

The receiver 510 receives configuration information for a code block group (CBG) for retransmission of a data channel from the base station and receives downlink control information including scheduling information for the data channel from the base station have.

In this case, as described above, the setting information for the code block group may include information indicating the number of the maximum code block groups per transport block, and the terminal may transmit such transmission (e.g., RRC signaling) from the base station through upper layer signaling Information indicating the maximum number of code block groups per block may be received. In addition, the downlink control information may include transmission indication information for a code block group for retransmission of a data channel.

The transmission indication information for the code block group may be indicated by a bitmap consisting of bits as many as the maximum number of code block groups per transmission block, which is information included in the setting information for the received code block group. For example, the maximum number of code block groups per transmission block may be determined to be one of 2, 4, 6, and 8, and thus the bit number of the bitmap may be determined to be one of 2, 4,

At this time, as an example of how each bit of the bitmap constituting the transmission instruction information for the code block group is set, each bit of the corresponding bitmap is set such that the code block group indicated by the bit corresponds to the above- 1 &quot;, and may be set to '0' if the code block group indicated by each bit is not transmitted through the above-mentioned data channel.

The downlink control information may further include flushing indication information for a code block group for retransmission of a data channel. As an example in which the flushing instruction information is indicated, the flushing instruction information may be indicated by 1 bit. If the 1-bit flushing instruction information indicates that the retransmission for an arbitrary code block group is instructed through the DL assignment DCI format based on the code block group (i.e., the transmission instruction information for the code block group Is set to '0' if the data stored in the soft buffer of the terminal corresponding to the code block group is valid, and if the data stored in the soft buffer of the terminal corresponding to the code block group is valid The UE determines whether to combine the data stored in the soft buffer with the retransmitted data when decoding the data of the code block group in which the UE retransmits the data. Can be defined.

The control unit 520 can control the overall operation required for the terminal to transmit and receive the data 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 (32)

A method for a terminal to transmit and receive a data channel,
Receiving setting information for a code block group (CBG) for retransmission of the data channel from a base station; And
And receiving downlink control information including scheduling information for the data channel from the base station,
Wherein the downlink control information includes transmission indication information for the code block group.
The method according to claim 1,
Wherein the setting information for the code block group includes:
And information indicating a maximum number of code block groups per transmission block (TB).
3. The method of claim 2,
Wherein the setting information for the code block group includes:
Lt; RTI ID = 0.0 &gt; uplink &lt; / RTI &gt; layer signaling.
3. The method of claim 2,
Wherein the transmission instruction information for the code block group includes:
And a bitmap consisting of bits of a maximum number of code block groups per transmission block (TB).
5. The method of claim 4,
Wherein the number of bits of the bitmap is determined to be one of 2, 4, 6, and 8.
5. The method of claim 4,
Wherein each bit of the bitmap comprises:
A code block group indicated by each bit is set to 1 when the data is transmitted through the data channel and is set to 0 when a code block group indicated by each bit is not transmitted through the data channel Lt; / RTI &gt;
The method according to claim 1,
The downlink control information includes:
Bit flushing instruction information indicating validity of data stored in a soft buffer of a terminal corresponding to a code block group in which retransmission is performed.
8. The method of claim 7,
Wherein the flushing instruction information includes:
Is set to 1 when the data stored in the soft buffer of the terminal corresponding to the code block group in which the transmission instruction information for the code block group is indicated by '1' is valid and is set to 0 when it is not valid .
A method for a base station to transmit and receive a data channel,
Transmitting configuration information for a code block group (CBG) for retransmission of the data channel to a terminal; And
And transmitting downlink control information including scheduling information for the data channel to the mobile station,
Wherein the downlink control information includes transmission indication information for the code block group.
10. The method of claim 9,
Wherein the setting information for the code block group includes:
And information indicating a maximum number of code block groups per transmission block (TB).
11. The method of claim 10,
Wherein the setting information for the code block group includes:
And transmitting the signal to the terminal through upper layer signaling.
11. The method of claim 10,
Wherein the transmission instruction information for the code block group includes:
And a bitmap consisting of bits of a maximum number of code block groups per transmission block (TB).
13. The method of claim 12,
Wherein the number of bits of the bitmap is determined to be one of 2, 4, 6, and 8.
13. The method of claim 12,
Wherein each bit of the bitmap comprises:
A code block group indicated by each bit is set to 1 when the data is transmitted through the data channel and is set to 0 when a code block group indicated by each bit is not transmitted through the data channel Lt; / RTI &gt;
10. The method of claim 9,
The downlink control information includes:
Bit flushing instruction information indicating validity of data stored in a soft buffer of a terminal corresponding to a code block group in which retransmission is performed.
16. The method of claim 15,
Wherein the flushing instruction information includes:
Is set to 1 when the data stored in the soft buffer of the terminal corresponding to the code block group in which the transmission instruction information for the code block group is indicated by '1' is valid and is set to 0 when it is not valid .
A terminal for transmitting and receiving a data channel,
And a receiving unit for receiving configuration information for a code block group (CBG) for retransmission of the data channel from the base station and receiving downlink control information including scheduling information for the data channel from the base station However,
Wherein the downlink control information includes transmission indication information for the code block group.
18. The method of claim 17,
Wherein the setting information for the code block group includes:
And information indicating a maximum number of code block groups per transmission block (TB).
19. The method of claim 18,
Wherein the setting information for the code block group includes:
And is received from a base station via upper layer signaling.
19. The method of claim 18,
Wherein the transmission instruction information for the code block group includes:
And a bitmap composed of bits of a maximum number of code block groups per transmission block (TB).
21. The method of claim 20,
Wherein the number of bits of the bitmap is determined to be one of 2, 4, 6 and 8 bits.
21. The method of claim 20,
Wherein each bit of the bitmap comprises:
A code block group indicated by each bit is set to 1 when the data is transmitted through the data channel and is set to 0 when a code block group indicated by each bit is not transmitted through the data channel .
18. The method of claim 17,
The downlink control information includes:
Bit flushing instruction information indicating validity of data stored in a soft buffer of a terminal corresponding to a code block group in which retransmission is performed.
24. The method of claim 23,
Wherein the flushing instruction information includes:
Is set to 1 when the data stored in the soft buffer of the terminal corresponding to the code block group in which the transmission instruction information for the code block group is indicated by '1' is valid and is set to 0 when it is not valid. .
A base station for transmitting and receiving a data channel,
And a transmitter for transmitting configuration information on a code block group (CBG) for retransmission of the data channel to the UE and transmitting downlink control information including scheduling information on the data channel to the UE However,
Wherein the downlink control information includes transmission indication information for the code block group.
26. The method of claim 25,
Wherein the setting information for the code block group includes:
And information indicating a maximum number of code block groups per transmission block (TB).
27. The method of claim 26,
Wherein the setting information for the code block group includes:
And transmits the uplink signal to the UE through upper layer signaling.
27. The method of claim 26,
Wherein the transmission instruction information for the code block group includes:
And a bitmap consisting of bits of a maximum number of code block groups per transmission block (TB).
29. The method of claim 28,
Wherein the number of bits of the bitmap is determined to be one of 2, 4, 6 and 8 bits.
29. The method of claim 28,
Wherein each bit of the bitmap comprises:
A code block group indicated by each bit is set to 1 when the data is transmitted through the data channel and is set to 0 when a code block group indicated by each bit is not transmitted through the data channel .
26. The method of claim 25,
The downlink control information includes:
Bit flushing instruction information indicating validity of data stored in a soft buffer of a terminal corresponding to a code block group in which retransmission is performed.
32. The method of claim 31,
Wherein the flushing instruction information includes:
Is set to 1 when the data stored in the soft buffer of the terminal corresponding to the code block group in which the transmission direction information for the code block group is indicated by '1' is valid and is set to 0 when it is not valid. .

Images