KR20180110577A - Methods for transmitting a data by configuring transport block and Apparatuses thereof - Google Patents

Abstract

The present invention relates to a method and an apparatus for transmitting and receiving data through a next-generation radio access network referred to as a new radio (NR). More specifically, the present invention relates to a terminal for transmitting and receiving data by configuring a transport block and an operation of a base station. According to an example of the present invention, the method comprises the steps of: receiving information on the maximum number of code block groups (CBGs) from the base station; configuring the CBG by dividing the transport block into N number of CBs, and grouping the N number of divided CBs into M number of CBGs, wherein the N and M are a natural number; and transmitting data through the transport block configured by the CBGs.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for transmitting data by configuring a transport block,

This disclosure relates to a method and apparatus for transmitting and receiving data through a next generation radio access network (hereinafter referred to as "NR [New Radio]"). More particularly, this disclosure relates to the operation of a terminal and a base station that constitute a transport block to transmit and receive data.

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.

As described above, in order to satisfy the requirements of the various scenarios described above using limited radio resources, a high-capacity data transmission / reception technique and a high data processing speed are required. In particular, for scenarios requiring large data transfer and low latency, such as eMBB and URLLC, the processing speed of data needs to be increased. To this end, a new technique for data transmission and reception procedure and HARQ feedback operation through the existing transmission block is required.

In the background described above, the present disclosure proposes a technique capable of performing HARQ feedback and retransmission operations in a shorter time unit in a data transmission / reception process.

In addition, the present disclosure proposes a concrete transport block configuration method and apparatus for performing HARQ feedback and retransmission operations in units of code blocks and code block groups constituting a transport block.

In order to solve the above-described problems, an embodiment of the present invention provides a method for transmitting data, the method comprising: receiving a maximum number of code block groups (CBG) from a base station; A natural number) code blocks, grouping the N code blocks into M (M is a natural number) code block groups to form a code block group, and transmitting the data through the transmission block composed of code block groups The method comprising the steps of:

According to another aspect of the present invention, there is provided a method of transmitting data, the method comprising the steps of: transmitting a maximum number of code block groups (CBG) information to a terminal; dividing a transmission block into N (N is a natural number) Grouping N divided code blocks into M (M is a natural number) code block groups to form a code block group, and transmitting data through a transmission block composed of a code block group do.

In an exemplary embodiment of the present invention, a terminal for transmitting data may include a receiving unit that receives information on a maximum number of code block groups (CBGs) from a base station, and a transmitting block that is divided into N (N is a natural number) There is provided a terminal apparatus including a control unit for grouping N divided code blocks into M (M is a natural number) code block groups and transmitting the data through a transmission block composed of a code block group .

In one embodiment, a base station that transmits data divides a transmission block into N (N is a natural number) code blocks, groups the N divided code blocks into M (M is a natural number) code block groups And a transmitter for transmitting data through a transmission block constituted by a code block group and a controller block constituting a code block group and a maximum code block group (CBG) number information and a code block group.

According to the embodiments of the present invention, HARQ feedback and retransmission operations over a shorter time unit than a transmission block unit are performed, thereby providing data transmission / reception with low latency.

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 for explaining a terminal operation according to an embodiment.
3 is a diagram for explaining an operation of configuring a code block group according to an embodiment.
4 is a view for explaining a base station operation according to an embodiment.
5 is a diagram illustrating a configuration of a UE according to an embodiment.
6 is a diagram illustrating a configuration of a base station according to an exemplary 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 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.

Configuring Transport Blocks

In the case of the 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 . When a decision is made for the TBS, the corresponding TB is segmented into a plurality of CBs according to a maximum CB (code block size) for encoding. The CRC is attached, and the interleaving is interleaved between the CBs and the mapping is performed on the allocated PDSCH / PUSCH resources. However, HARQ ACK / NACK feedback and retransmission operations for any PDSCH / PUSCH are performed in units of transmission blocks (TB).

In NR, eBB requires support for a larger TBS than LTE, so the number of CBs constituting one TB can be drastically increased according to the definition of the maximum CB size. Therefore, there is a great need to further subdivide HARQ ACK / NACK feedback and retransmission units for one TB. It is also possible to configure a code block group (CBG) by grouping one or more CBs and transmit the corresponding CBG-based HARQ ACK / NACK feedback And a need for retransmission or HARQ ACK / NACK feedback and retransmission on a CB basis.

In consideration of this situation, the present disclosure proposes a technique of transmitting data by constructing a code block group in transmitting and receiving data between a terminal and a base station.

The embodiments described below can 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.

On the other hand, in the usage scenario of NR, URLLC means a service supporting high reliability and low delay, and means a service used when a serious problem occurs when a delay occurs in data transmission / reception although the size of data transmitted / . For example, if the delay of data transmission and reception becomes large, such as an autonomous vehicle, the URLLC service can be used when human and material damage may occur due to a traffic accident.

eMBB is a service that supports high-speed data transmission and can be used when a large amount of data needs to be transmitted or received. For example, if a large amount of data needs to be transmitted per unit time, such as a 3D video or UHD service, the eMBB service can be used.

The mMTC can be a service used when the amount of data to be transmitted and received is not large and delay is not a problem but low power consumption is required. For example, in the case of sensor equipment installed to build a Smart City, the mMTC service can be used because it must operate for as long as possible with the onboard battery.

Hereinafter, operations of the terminal and the base station according to the present embodiment will be described with reference to the drawings.

2 is a diagram for explaining a terminal operation according to an embodiment.

Referring to FIG. 2, the UE may perform a step of receiving a maximum number of code block groups (CBG) from a base station (S210). The maximum code block group number information includes information on the maximum number of code block groups that can be included in one transport block in dividing a transport block into a plurality of code blocks and configuring one or more code blocks into a code block group .

The maximum code block group number information may be received through UE-specific upper layer signaling or cell-specific higher layer signaling. For example, the maximum code block group number information may be received UE-specific or cell-specific via RRC signaling.

The UE can perform a step of dividing the transport block into N (N is a natural number) code blocks and grouping the N divided code blocks into M (M is a natural number) code block groups to construct a code block group (S220). For example, the terminal may divide one transport block set for data transmission into N code blocks. Then, the terminal may group the N code blocks into M code block groups to form a code block group.

In one example, the number of M code block groups may be determined based on a smaller of the maximum number of code block groups and the number of N code blocks. Specifically, the UE can select a smallest value among the maximum number of code block groups received from the base station and the number of N code blocks into which the transport block is divided, and determine the number of code block groups below the selected value. For example, when the maximum number of code block groups is set to 3 and the number of divided code blocks is 10, the terminal can select one of the code block group numbers as a natural number of 3 or less. That is, the number of code block groups may be one of 1, 2, and 3.

As another example, the terminal can determine the number of code blocks per code block group included in each code block group based on a value obtained by dividing the number of code blocks by the number of code block groups. For example, when the number of code block groups is determined by the above-described method, the terminal divides the number N of code blocks divided by the determined number M of code block groups, Can be determined.

As an example of determining the number of code blocks included in the code block group, the number of code blocks per code block group included in each of the first K code block groups based on the code block group index among the M code block groups is The value obtained by dividing the value divided by the number of code block groups can be determined. Specifically, if ten code blocks N and three code block groups M are determined, the terminal can group the four code blocks into K code block groups based on the code block group index. For example, 4 may be a value determined by the expression ceil (N / M).

As another example of determining the number of code blocks included in the code block group, the number of code blocks per code block group included in each of the remaining code block groups excluding the K code block groups out of the M code block groups is determined by code The value obtained by dividing the value obtained by dividing the number of blocks by the number of block groups can be determined. Specifically, if the number of code blocks N is 10 and the number of code block groups M is 3, the terminal includes three code blocks in the remaining MK code block groups excluding the K code block groups based on the code block group index . For example, 3 may be a value determined by the expression of floor (N / M).

On the other hand, K in the above embodiments is determined by the remainder value obtained by dividing the number N of code blocks by the number M of code block groups. For example, if N is 10 and M is 3, then K may be determined to be 1.

In summary, when there are 10 code blocks and 3 code block groups, the terminal includes four code blocks in one code block group and three code blocks in the remaining two code block groups based on the code block group index Can be controlled to be included. That is, the code block group index 0 may include four code blocks, and the code block group indexes 1 and 2 may be grouped so that each code block includes three code blocks.

If the number of code blocks to be included in each code block group is determined, the terminal determines which code block is included in which code block group to be grouped.

For example, the UE can allocate N code blocks to M code block groups based on the code block index and the number of code blocks per code block group, and group them. Specifically, when 10 code blocks are grouped into 3 code block groups, the UEs sequentially include code blocks in the code block groups in the code block index order.

3, the code block indexes from CB # 0 to CB # 3 are included in the code block group # 0 and are grouped, and the code block indexes from CB # 4 to CB # 6 are grouped into code block group # 1 And the code block indexes from CB # 7 to CB # 9 are included in the code block group # 2 and grouped.

Through the above operation, the terminal can divide the transport block into a plurality of code blocks, and group the divided code blocks into each code block group based on the above-described embodiment.

The terminal may perform a step of transmitting data through a transmission block composed of a code block group (S230). For example, the UE attaches a CRC to each code block, groups it into a code block group, and transmits the transmission block to the BS. The base station can control the HARQ operation and the retransmission operation to be performed on a code block group basis.

Through this, although the transmission block is formed to be long on the time axis, the HARQ operation and the retransmission operation are performed on a code block group basis, thereby enabling fast data processing.

Hereinafter, the operation when the base station transmits downlink data to the mobile station will be described with reference to the operation of the base station.

4 is a view for explaining a base station operation according to an embodiment.

Referring to FIG. 4, the BS may perform a step of transmitting the maximum number of Code Block Groups (CBG) information to the UE (S400). The base station can transmit the maximum code block group number information determined according to a predetermined criterion to the terminal. For example, the maximum code block group number information may be transmitted through UE-specific upper layer signaling or cell-specific higher layer signaling.

The base station can perform a step of dividing a transport block into N (N is a natural number) code blocks and grouping the N divided code blocks into M (M is a natural number) code block groups to form a code block group (S410).

As described above, the base station can determine the number of M code block groups based on the smaller of the maximum number of code block groups and the number of N code blocks. For example, the base station can select a smaller value among the set number of maximum code block groups and the number of N code blocks into which the transport block is divided, and determine the number of code block groups below the selected value. That is, when the maximum number of code block groups is set to three and the number of divided code blocks is ten, the base station can select one of the code block group numbers as a natural number of 3 or less. Therefore, the number of code block groups can be any one of 1, 2, and 3.

The base station can determine the number of code blocks for each code block group included in each code block group based on a value obtained by dividing the number of code blocks by the number of code block groups. For example, when the number of code block groups is determined by the above-described method, the base station divides the number N of code blocks divided by the determined number M of code block groups into a code block group Can be determined.

For example, the number of code blocks per code block group included in each of the first K code block groups based on a code block group index among M code block groups is calculated by dividing the value obtained by dividing the number of code blocks by the number of code block groups . ≪ / RTI > Specifically, if ten code blocks N and three code block groups M are determined, the base station can group the four code blocks into K code block groups based on the code block group index. For example, 4 may be a value determined by the expression ceil (N / M).

As another example, the number of code blocks per code block group included in each of the remaining code block groups excluding the K code block groups out of M code block groups is a value obtained by dividing the value obtained by dividing the number of code blocks by the number of code block groups Can be determined. Specifically, if the number of code blocks N is 10 and the number of code block groups M is 3, the base station includes 3 code blocks in the remaining MK code block groups excluding the K code block groups based on the code block group index . That is, 3 may be a value determined by the expression of floor (N / M).

As described above, K is determined by a remainder value obtained by dividing the number N of code blocks by the number M of code block groups. For example, if N is 10 and M is 3, then K may be determined to be 1.

In addition, the base station can allocate N code blocks to M code block groups based on the code block index and the number of code blocks per code block group and group them by the code block index order. Specifically, when 10 code blocks are grouped into 3 code block groups, the BS sequentially groups the code blocks into code block groups in the code block index order. That is, as shown in FIG. 3, code blocks may be included in each code block group in index order.

The base station may perform a step of transmitting data through a transport block formed of a code block group (S420). The base station can transmit the downlink data to the terminal through the transmission block in which each code block is grouped into the code block group by the above-mentioned reference.

Hereinafter, various embodiments according to which a terminal or a base station constructs and transmits a code block group to transmit uplink data or downlink data will be described for each operation step of the terminal and the base station.

Examples constituting the number of code block groups (CBG)

The number of CBGs constituting an arbitrary transport block may be dynamically signaled through the downlink control information (DCI) or set implicitly. For example, the number of CBGs for an arbitrary UE may be included in a DL assignment DCI or an UL grant DCI for transmitting resource allocation information for a PDSCH or a PUSCH, and may be transmitted through a PDCCH.

Or as a function of the TBS size transmitted on any PDSCH or PUSCH, or as a function of the number of CBs determined by TBS and maximum CB size.

Or the size of the corresponding CBG may be determined according to the number of mini-slots or mini-slot groups constituting an arbitrary slot.

Or semi-static through UE-specific or cell-specific upper layer signaling for each UE.

Or as a function of the number of CBGs configured through UE-specific or cell-specific higher layer signaling or L1 signaling over DCI as described above and the number of CBs constituting TB transmitted over any PDSCH or PUSCH. For example, if the number of CBGs (e.g., the maximum number of CBGs) set through UE-specific or cell-specific upper layer signaling or L1 signaling is smaller than or equal to the number of CBs that constitute the corresponding TB, The CBG constituting the TB can be determined. That is, when a single PDSCH or PUSCH is transmitted for each UE through UE-specific or cell-specific upper layer signaling or L1 signaling, a maximum code block group that can be configured for one TB transmitted through the corresponding PDSCH or PUSCH You can indicate the number. In this case, the actual number of CBGs may be set to a value less than or equal to the number of CBs constituting the TB and the maximum number of code block groups set by the base station.

Or a combination of parameters transmitted through the UE-specific or cell-specific upper layer signaling and parameters transmitted through L1 control signaling such as DL assignment DCI or UL grant, and the number and configuration of CBGs for any TB . Specifically, when a CBG reference transmission or retransmission operation is set for an arbitrary terminal through UE-specific or cell-specific upper layer signaling, the BS determines the size of the CBG instruction indication information area to be included in the DL assignment DCI or the UL grant for the corresponding UE (Number of bits constituting the CBG indication information area), and the number of CBGs for the TBs transmitted and received via the PDSCH or PUSCH allocated through the corresponding DL assignment DCI or UL grant is defined by the corresponding CBG indication Can be defined to be set through the information area. For example, when a base station transmits a CBG-based PDSCH or PUSCH to an arbitrary UE, the CBG indication information area configured through DL assignment DCI or UL grant for the corresponding UE is allocated to the corresponding DL assignment Or a bitmap information region for indicating a CBG transmitted through a PDSCH or a PUSCH transmission resource allocated through a DC grant or an UL grant. Accordingly, through the UE-specific or cell-specific upper layer signaling, the BS determines the size of the bit allocation information area for the corresponding CBG indication to be included in the DL assignment DCI or UL grant for an arbitrary terminal (i.e., The number of bits constituting the DL grant DCI or UL grant for the corresponding UE is determined and the bitmap size of the CBG indication information area included in the UL grant is determined. However, when a CBG-based transmission or retransmission operation is set for a PDSCH of an arbitrary terminal by a base station, the PUCCH of the corresponding terminal is set according to the bitmap size of the CBG indication information area set through the corresponding terminal- Alternatively, the size (e.g., number of HARQ ACK / NACK feedback bits) of the HARQ ACK / NACK feedback information through the PUSCH may be determined. In this manner, a CBG-based PDSCH or PUSCH transmission or retransmission is set for an arbitrary UE, and the size of the CBG indication information area of the DL assignment DCI or UL grant for the corresponding UE is determined by the base station through the UE- When the PDSCH or PUSCH is transmitted for the corresponding UE, the number of CBGs constituting the TB transmitted through the PDSCH or PUSCH transmits transmission resource allocation information for initial transmission of the corresponding PDSCH or PUSCH The DL assignment may be indicated through the CBG indication information area of the DCI or UL grant. For example, as described above, a CBG instruction information area included in a DL assignment DCI or an UL grant is configured as a bit map for a CBG indication transmitted through a PDSCH or a PUSCH allocated through the corresponding DL assignment DCI or UL grant , The corresponding TB is configured through the bitmap-based CBG indication information area included in the corresponding DL assignment DCI or UL grant when allocating an initial PDSCH or an initial PUSCH resource for arbitrary TB transmission The number of CBGs may be implicitly indicated. Specifically, in constructing the bitmap information area for the CBG indication in the base station, the CBG transmitted through the corresponding DL assignment DCI or the PDSCH or PUSCH allocated by the UL grant is designated as '1' 0 ', it is possible to construct a bit map for the CBG indication of DL assignment DCI or UL grant including initial PDSCH or PUSCH resource allocation information for an arbitrary TB transmission, Bits of the bitmap for the CBG indication may be composed of '1' from the LSB or MSB by the number of CBGs and '0' for the remaining bits (s).

As described above, the number of code block groups included in one transport block can be determined through various embodiments.

How to group code blocks

Once the number of code block groups is determined, the code blocks must be grouped into code block groups. For this, various grouping methods can be applied. In the following, embodiments will be described according to the order of dividing the transport block, and a detailed code block grouping embodiment will be described in each embodiment.

How to divide code block group (CBG) preferentially

A primary partition is made to the CGB level for any TB, and then a partition for CB within the CBG can be performed. That is, when the number of CBGs is set according to the above-described various methods, the TBs can be configured to be CBGs evenly divided or almost evenly divided according to the number of CBGs. If an evenly or almost evenly divided CBG is constructed for the TB of any PDSCH or PUSCH, the CB can be independently configured according to the maximum CB size within each CBG. When independent CB configuration is performed at the CBG level, inter-CB interleaving may be performed in each CBG, or mapping may be performed in the assigned PDSCH or PUSCH resource without interleaving. Or interleaving may be established by the base station by UE-specific or cell-specific higher layer signaling or L1 control signaling.

A method of preferentially dividing a code block (CB)

Any TB that is transmitted through any PDSCH or PUSCH is divided into evenly divided or almost evenly divided CB (s) according to the maximum CB size, and the divided CBs ) Can be sequentially grouped into CBG according to the set number of CBGs.

For example, when N CBs are configured from CB # 0 to CB # (N-1) for an arbitrary TB and M CBGs are set for the TB, CBG # 0 to CBG # ), The following Equation (1) can be applied. In other words, any CBG # m (where m = 0, ..., M-1) is composed of CB # n that satisfies Equation (1).

However, [X] means the maximum integer not greater than X. That is, it means a maximum integer (e.g., a floor function) among integers less than or equal to X. [ According to Equation (1), in determining the CBs constituting each CBG, one CB is allocated to each CBG # 0 to # (M-1) in increasing order from CB # 0 to # -1) cyclically, and is not limited to the form of the corresponding equation. That is, all cases in which CB is sequentially mapped to each CBG in an increasing order of the CB index are included in this embodiment.

CBG # 0 = {CB # 0, 3, 6, 9}, CBG # 1 = {CB # 1, 4, 7}, CBG # 2 = { CB # 2, 5, 8}, each CB can be sequentially / cyclically mapped to each CBG in the order of increasing index.

As another example, in constructing M CBGs, the first K CBGs are composed of ceil (N / M) CB (s) and the remaining (MK) CBGs are CB (s) . However, in this case, K = N mod M is determined. Accordingly, the first K CBGs of all M CBGs are sequentially allocated to CBs 0 to CB # (K / ceil (N / M) -1) (MK) CBGs from the CB # (K · ceil (N / M)) to CB # (N-1) (N / M) CBs (s) sequentially for each (N / M) CBs. CBG # 0 = {CB # 0,1,2,3}, CBG # 1 = {CB # 4,5,6}, CBG # 2 = CB # 7, 8, 9}.

As another example, a method of mapping CBs constituting an arbitrary CBG can be constructed by the following expression (2). In other words, any CBG # m (where m = 0, ..., M-1) is composed of CB # n satisfying the expression (2).

However, according to Equation (2), each CBG is composed of consecutive [N / M] CBs, and the last CBG is composed of remaining CBs. In other words, CBG # 0 is composed of [N / M] CBs from CB # 0 to # [N / M] CBG # (M-1) is composed of [N / M] CBs and CBG # (M-1) Will be made up of remaining CBs.

As another example, a method of constructing CBs in the reverse order of the above-described equations (1) and (2) (i.e., sequentially from the highest CBG index) may be applied.

In the above-described embodiments, CB interleaving for PDSCH / PUSCH resource mapping may be performed in CBG unit or TB unit, or localized mapping may be applied without interleaving. Or whether the corresponding interleaving is applied and the CBG-based or TB-based interleaving mode may be set in the base station by UE-specific or cell-specific higher layer signaling or L1 control signaling.

PDSCH / PUSCH  Resource mapping method

Code block group specific resource mapping ( CBG -specific resource mapping) Embodiment

A method of mapping a TB to be transmitted to an allocated PDSCH / PUSCH resource may be configured to perform resource mapping and rate matching for each CBG constituting the corresponding TB. That is, the corresponding PDSCH or PUSCH resource mapping divides a PDSCH or PUSCH resource allocated according to the number of CBGs, and performs resource mapping and ratio matching for each CBG in the divided PDSCH or PUSCH resource (rate matching) can be performed.

At this time, the resource partitioning can be set to be performed in a time domain. That is, resource mapping is performed on evenly or almost evenly divided symbols (or symbol groups, minislots, minislot groups, slots, and slot groups) according to the number of CBGs for TTI (Transmission Time Interval) in which PDSCH or PUSCH transmission is performed. As shown in FIG.

Or the corresponding resource partition may be made in the frequency domain. That is, resource allocation and rate matching for each CBG in the corresponding subband is performed by dividing allocated physical resource block (PRB) resources according to the number of CBGs into evenly or almost evenly divided sub- . At this time, each resource mapping of each CBG within the corresponding divided region may be mapped in a frequency first manner or a time first manner. However, in addition to the frequency first manner or time first manner mapping, when the base station transmits an L1 control signal (for example, DL assignment DCI or UL grant DCI) or a UE-specific or cell- .

Transmission block Specific resource mapping (TB-specific resource mapping)

Resource mapping and rate matching for the transmission resources constituting the PDSCH or PUSCH allocated in TB units can be performed. That is, a consistent resource mapping and rate matching scheme can be applied to PDSCH / PUSCH resources allocated for the corresponding TB transmission irrespective of the number of CBs or CBGs constituting an arbitrary TB.

In addition, the CBG grouping method or the resource mapping / ratio matching method to be applied to each terminal may be set for the CBG grouping method and the resource mapping / ratio matching method described above. In this case, the CBG grouping method and the resource mapping / ratio matching method may be set independently through separate information areas, or may be jointly set to one information area. The setting may also be set semi-static via UE-specific or cell-specific higher layer signaling, or may be set dynamically via an L1 control signal (e.g., DL assignment DCI or UL grant DCI) And transmitted.

The embodiments described above may be applied independently or in whole or in part to each other.

Hereinafter, configurations of a terminal and a base station capable of performing all or a part of the above-described embodiments will be described with reference to the drawings.

5 is a diagram illustrating a configuration of a UE according to an embodiment.

5, a UE 500 for transmitting data includes a receiving unit 530 for receiving information on the maximum number of code block groups (CBG) from a base station, and a transmitting block including N (N is a natural number) A control unit 510 for grouping N divided code blocks into M (M is a natural number) code block groups to form a code block group, and a transmitter for transmitting data through a transmission block composed of code block groups 520).

The receiving unit 520 may receive the maximum code block group number information through UE-specific upper layer signaling or cell-specific higher layer signaling. For example, the maximum code block group number information may be received UE-specific or cell-specific via RRC signaling. In addition, the receiver 510 receives downlink control information, data, and messages from the base station through the corresponding channel.

The control unit 510 may divide one transport block set for data transmission into N code blocks and group the N divided code blocks into M code block groups to form a code block group. In one example, the number of M code block groups may be determined based on a smaller of the maximum number of code block groups and the number of N code blocks. Specifically, the controller 510 may select a smaller value among the maximum number of code block groups received from the base station and the number of N code blocks divided into the transport blocks, and determine the number of code block groups to be less than a predetermined value. As another example, the control unit 510 may determine the number of code blocks per code block group included in each code block group based on a value obtained by dividing the number of code blocks by the number of code block groups. For example, when the number of code block groups is determined by the above-described method, the controller 510 divides the number of divided code blocks N by the number of determined code block groups M, The number of code blocks to be decoded can be determined.

Specifically, the control unit 510 divides the number of code blocks into the number of code block groups for each code block group included in each of the first K code block groups based on the code block group index among the M code block groups The value can be determined as a value obtained by raising the value. The controller 510 determines a value obtained by dividing the number of code blocks by the number of code block groups for the number of code blocks for each code block group included in each of the remaining code block groups excluding the K code block groups among the M code block groups It can be determined as a value subjected to the discarding process. On the other hand, K in the above embodiments is determined by the remainder value obtained by dividing the number N of code blocks by the number M of code block groups. For example, if N is 10 and M is 3, then K may be determined to be 1.

In addition, when the number of code blocks to be included in each code block group is determined, the control unit 510 determines which code block is included in which code block group to group. For example, the control unit 510 may allocate N code blocks to M code block groups based on the code block index and the number of code blocks per code block group, based on the code block index order. Specifically, when 10 code blocks are grouped into 3 code block groups, the controller 510 sequentially groups code blocks into code block groups in order of code block index.

In addition, the control unit 510 controls the overall operation of the user terminal 500 according to the above-described embodiments, by configuring the transmission block into one or more code block groups to transmit data.

The transmitter 530 attaches a CRC to each code block, groups the code blocks into a code block group, and transmits the transmission block to the base station. In addition, the transmitter 530 transmits uplink control information, data, and a message to the base station through the corresponding channel.

6 is a diagram illustrating a configuration of a base station according to an exemplary embodiment of the present invention.

Referring to FIG. 6, a base station 600 for transmitting data divides a transmission block into N (N is a natural number) code blocks and groups the N divided code blocks into M (M is a natural number) code block groups And a transmitter 620 for transmitting data through a transmission block including a control block 610 constituting a code block group and a code block group (code block group, CBG) number information and a code block group to the terminal .

The control unit 610 can determine the number of M code block groups based on the smaller of the maximum number of code block groups and the number of N code blocks. For example, the controller 610 may select a smaller value among the set number of maximum code block groups and the number of N code blocks into which the transport block is divided, and determine the number of code block groups to be less than a predetermined value. That is, when the maximum number of code block groups is set to three and the number of divided code blocks is ten, the controller 610 can select one of the code block group numbers as a natural number of 3 or less. Therefore, the number of code block groups can be any one of 1, 2, and 3.

The control unit 610 may determine the number of code blocks for each code block group included in each code block group based on a value obtained by dividing the number of code blocks by the number of code block groups. For example, when the number of code block groups is determined by the above-described method, the controller 610 divides the number of divided code blocks N by the number of determined code block groups M, The number of code blocks to be decoded can be determined. For example, the number of code blocks per code block group included in each of the first K code block groups based on a code block group index among M code block groups is calculated by dividing the value obtained by dividing the number of code blocks by the number of code block groups . ≪ / RTI > As another example, the number of code blocks per code block group included in each of the remaining code block groups excluding the K code block groups out of M code block groups is a value obtained by dividing the value obtained by dividing the number of code blocks by the number of code block groups Can be determined. As described above, K is determined by a remainder value obtained by dividing the number N of code blocks by the number M of code block groups.

In addition, the controller 610 can allocate N code blocks to M code block groups based on the code block index and the number of code blocks per code block group, and group them. Specifically, when 10 code blocks are grouped into 3 code block groups, the BS sequentially groups the code blocks into code block groups in the code block index order.

In addition, the control unit 610 controls the overall operation of the base station 600 according to the above-described embodiments, by constructing the transmission block into one or more code block groups and transmitting the data.

Meanwhile, the transmitter 620 can transmit the downlink data to the terminal through a transmission block in which each code block is grouped into a code block group based on the above-described criteria. In addition, the transmitter 620 may transmit the maximum number of code block groups (CBG) information to the UE through the UE-specific upper layer signaling or the cell-specific higher layer signaling.

In addition, the transmission unit 620 and the reception unit 630 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiments to and from the terminal.

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. It is therefore to be interpreted that the content of the above standard content and part of the standard documents is added to or defined in the scope of the present disclosure.

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

Claims (24)

A method for a terminal to transmit data,
Receiving information on a maximum number of code block groups (CBG) from a base station;
Dividing the transport block into N (N is a natural number) code blocks and grouping the N divided code blocks into M (M is a natural number) code block groups to form a code block group; And
And transmitting data through a transport block comprised of the code block group. The method according to claim 1,
Wherein the maximum code block group number information includes at least one of
The UE-specific higher layer signaling or the cell-specific higher layer signaling. The method according to claim 1,
Wherein the number of M code block groups is a number
The number of the maximum code block groups and the number of the N code blocks, whichever is smaller. The method according to claim 1,
Wherein configuring the code block group comprises:
Wherein the number of code blocks per code block group included in each of the code block groups is determined based on a value obtained by dividing the number of code blocks by the number of code block groups. 5. The method of claim 4,
Wherein the number of code blocks per code block group included in each of the first K code block groups based on a code block group index of the M code block groups is calculated by dividing a value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein the number of code blocks per code block group included in each of the remaining code block groups excluding the K code block groups is calculated by dividing the value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein K is determined according to a remainder value obtained by dividing N by M. 5. The method of claim 4,
Wherein configuring the code block group comprises:
Wherein the N code blocks are grouped into the M code block groups based on a code block index sequence based on a code block group index and a code block number per code block group. A method for a base station to transmit data,
Transmitting information on a maximum number of code block groups (CBGs) to a terminal;
Dividing the transport block into N (N is a natural number) code blocks and grouping the N divided code blocks into M (M is a natural number) code block groups to form a code block group; And
And transmitting data through a transport block comprised of the code block group. 8. The method of claim 7,
Wherein the maximum code block group number information includes at least one of
Specific higher layer signaling or cell specific higher layer signaling. 8. The method of claim 7,
Wherein the number of M code block groups is a number
The number of the maximum code block groups and the number of the N code blocks, whichever is smaller. 8. The method of claim 7,
Wherein configuring the code block group comprises:
Wherein the number of code blocks per code block group included in each of the code block groups is determined based on a value obtained by dividing the number of code blocks by the number of code block groups. 11. The method of claim 10,
Wherein the number of code blocks per code block group included in each of the first K code block groups based on a code block group index of the M code block groups is calculated by dividing a value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein the number of code blocks per code block group included in each of the remaining code block groups excluding the K code block groups is calculated by dividing the value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein K is determined according to a remainder value obtained by dividing N by M. 11. The method of claim 10,
Wherein configuring the code block group comprises:
Wherein the N code blocks are grouped into the M code block groups based on a code block index sequence based on a code block group index and a code block number per code block group. In a terminal for transmitting data,
A receiving unit for receiving the maximum number of code block groups (CBGs) from the base station;
A control unit for dividing a transmission block into N (N is a natural number) code blocks, and grouping the N divided code blocks into M (M is a natural number) code block groups to form a code block group; And
And a transmitter for transmitting data through a transmission block composed of the code block group. 14. The method of claim 13,
Wherein the maximum code block group number information includes at least one of
Terminal-specific upper layer signaling or cell-specific upper layer signaling. 14. The method of claim 13,
Wherein the number of M code block groups is a number
The number of the maximum code block groups and the number of the N code blocks, whichever is smaller. 14. The method of claim 13,
Wherein,
Wherein the number of code blocks per code block group included in each of the code block groups is determined based on a value obtained by dividing the number of code blocks by the number of code block groups. 17. The method of claim 16,
Wherein the number of code blocks per code block group included in each of the first K code block groups based on a code block group index of the M code block groups is calculated by dividing a value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein the number of code blocks per code block group included in each of the remaining code block groups excluding the K code block groups is calculated by dividing the value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein K is determined according to a remainder value obtained by dividing N by M. 17. The method of claim 16,
Wherein,
And allocates the N code blocks to the M code block groups based on the code block index order based on the code block group index and the code block number per code block group. A base station for transmitting data,
A control unit for dividing a transmission block into N (N is a natural number) code blocks, and grouping the N divided code blocks into M (M is a natural number) code block groups to form a code block group; And
And a transmitter for transmitting data to a terminal through a transmission block composed of a code block group and a code block group (CBG) number information. 20. The method of claim 19,
Wherein the maximum code block group number information includes at least one of
The UE-specific upper layer signaling or the cell-specific higher layer signaling. 20. The method of claim 19,
Wherein the number of M code block groups is a number
The number of the maximum code block groups and the number of N code blocks, whichever is smaller. 20. The method of claim 19,
Wherein,
Wherein the number of code blocks per code block group included in each of the code block groups is determined based on a value obtained by dividing the number of code blocks by the number of code block groups. 23. The method of claim 22,
Wherein the number of code blocks per code block group included in each of the first K code block groups based on a code block group index of the M code block groups is calculated by dividing a value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein the number of code blocks per code block group included in each of the remaining code block groups excluding the K code block groups is calculated by dividing the value obtained by dividing the number of code blocks by the number of code block groups Lt; / RTI >
Wherein K is determined according to a remainder value obtained by dividing N by M. 23. The method of claim 22,
Wherein,
And allocates the N code blocks to the M code block groups based on a code block index order based on a code block group index and a code block number per code block group.

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