CN108712735B

CN108712735B - Method and apparatus for configuring transport blocks to transmit data

Info

Publication number: CN108712735B
Application number: CN201810271091.0A
Authority: CN
Inventors: 朴奎镇; 金起台; 崔宇辰
Original assignee: KT Corp
Current assignee: KT Corp
Priority date: 2017-03-29
Filing date: 2018-03-29
Publication date: 2021-09-24
Anticipated expiration: 2038-03-29
Also published as: CN108712735A

Abstract

Disclosed are a method and apparatus for transmitting and receiving data through a next generation radio access network (hereinafter, also referred to as "New Radio (NR)"). More particularly, operations of a UE and a BS configuring a transport block to transmit and receive data are disclosed. For example, the provided methods and apparatus include the steps of: the UE receiving information on a maximum number of Code Block Groups (CBGs) from the BS; configuring a code block group by dividing a transmission block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number); and transmitting data through the transport block configured by the code block group.

Description

Method and apparatus for configuring transport blocks to transmit data

Cross Reference to Related Applications

The present application claims priority of korean patent application nos. 10-2017-.

Technical Field

The present disclosure relates to a method and apparatus for transmitting and receiving data through a next generation radio access network (hereinafter, also referred to as "New Radio (NR)"). More particularly, the present disclosure relates to the operation of a user equipment and a base station configuring a transport block to transmit and receive data.

Background

The 3GPP has recently approved "Study on New Radio Access Technology", which is a research project for researching next generation/5G Radio Access technologies, and based on which the RAN WG1 is conducting discussions on a frame structure, channel coding and modulation, a waveform, and a plurality of Access schemes for NR. NR needs to be designed in order to meet various requirements for respective subdivided and detailed usage scenarios and improved data transmission rates compared to LTE/LTE advanced.

As representative NR usage scenarios, enhanced mobile broadband (eMBB), large-scale machine type communication (mtc), and ultra-reliable low-latency communication (URLLC) are proposed, and a more flexible frame structure design than the LTE/LTE advanced frame structure is required to meet the requirements of each usage scenario.

As described above, in order to satisfy the requirements of various scenarios through limited wireless resources, a technique of transmission/reception of high-capacity data and a fast data processing rate is required. In particular, scenarios requiring high capacity data transmission and low latency, such as eMBB and URLLC, require an increase in data processing rate. For this reason, a new technique for a conventional data transmission/reception process through a transport block and HARQ feedback operation is required.

Disclosure of Invention

In this context, an aspect of the present disclosure is to provide a technique for performing HARQ feedback and retransmission operations in a shorter time unit during a data transmission/reception process.

Another aspect of the present disclosure is to provide a detailed method and apparatus for configuring a transport block to perform HARQ feedback and retransmission operations in a code block unit for configuring the transport block and in a code block group unit.

According to an aspect of the present disclosure, there is provided a method of transmitting data by a User Equipment (UE). The method comprises the following steps: receiving information on a maximum number of Code Block Groups (CBGs) from a Base Station (BS); configuring a code block group by dividing a transmission block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number); and transmitting data through the transport block configured by the code block group.

According to another aspect of the present disclosure, there is provided a method of transmitting data by a Base Station (BS). The method comprises the following steps: transmitting information on a maximum number of Code Block Groups (CBGs) to a User Equipment (UE); configuring a code block group by dividing a transmission block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number); and transmitting data through the transport block configured by the code block group.

According to another aspect of the present disclosure, there is provided a User Equipment (UE) for transmitting data. The UE includes: a receiver configured to receive information on a maximum number of Code Block Groups (CBGs) from a Base Station (BS); a controller configured to configure a code block group by dividing a transmission block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number); and a transmitter configured to transmit data through the transport block configured by the code block group.

According to another aspect of the present disclosure, there is provided a Base Station (BS) for transmitting data. The BS includes: a controller configured to configure a code block group by dividing a transmission block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number); and a transmitter configured to transmit information and data regarding a maximum number of Code Block Groups (CBGs) to a User Equipment (UE) through a transport block configured by the code block groups.

According to the present embodiment, there are effects as follows: data transmission/reception with low delay is provided by performing HARQ feedback and retransmission operations in a time unit shorter than that of a transport block unit.

Drawings

The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

fig. 1 illustrates an array of OFDM symbols in the case where different subcarrier spacings are used according to the present embodiment;

fig. 2 is a diagram for describing an operation of a UE according to an embodiment;

FIG. 3 is a diagram for describing the operation of configuring a group of code blocks according to an embodiment;

fig. 4 is a diagram for describing a BS operation according to an embodiment;

fig. 5 illustrates a configuration of a UE according to an embodiment; and is

Fig. 6 illustrates a configuration of a BS according to an embodiment.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In adding reference numerals to elements in each drawing, identical elements will be referred to by identical reference numerals, where possible, even though they are shown in different drawings. In addition, in the following description of the present disclosure, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

As used herein, a wireless communication system may mean a system for providing various communication services such as a voice service and a packet data service. A wireless communication system may include a User Equipment (UE) and a base station (BS or eNB).

The user equipment may be a comprehensive concept indicating a terminal for use in wireless communication, including a UE (user equipment) in WCDMA, LTE, HSPA, IMT-2020(5G or new radio), and the like, and an MS (mobile station), UT (user terminal), SS (subscriber station), wireless device in GSM, and the like.

A base station or cell may generally refer to a station in which communication with User Equipment (UE) is performed, and also inclusively means all of various coverage areas such as a node B, an evolved node B (enb), a enode-B (gnb), a Low Power Node (LPN), a sector, a site, various types of antennas, a Base Transceiver System (BTS), an access point, a point (e.g., a transmission point, a reception point, or a transmission point), a relay node, a megacell, a macrocell, a microcell, a picocell, a femtocell, a Remote Radio Head (RRH), a radio frequency unit (RU), and a small cell.

Each of the various cells described above has a base station that controls the corresponding cell, and therefore, the base station can be understood in two ways: 1) the base station may be the device itself that provides the megacells, macrocells, microcells, picocells, femtocells, and microcells associated with the wireless area; or 2) the base station may indicate the wireless zone itself. In i), all devices that interact with each other to enable the devices to provide a predetermined wireless area to be controlled by the same entity or cooperatively configure the wireless area may be indicated as base stations. A point, a transmission/reception point, a transmission point, a reception point, etc. may be embodiments of a base station based on the configuration type of the wireless area. In ii), a wireless area which receives or transmits signals from the viewpoint of a terminal or a neighboring base station may itself be indicated as a base station.

In this specification, a cell may refer to a coverage of a signal transmitted from a transmission/reception point, a component carrier having a coverage of a signal transmitted from a transmission/reception point (transmission point or transmission/reception point), or a transmission/reception point itself.

In the specification, a user equipment and a base station are used as two (uplink or downlink) inclusive transceiving bodies embodying the technology and technical concept described in the present specification, and may not be limited to predetermined terms or words.

Here, Uplink (UL) refers to a scheme for a UE to transmit/receive data to/from a base station, and Downlink (DL) refers to a scheme for a base station to transmit/receive data to/from a UE.

The uplink transmission and the downlink transmission may be performed based on a TDD (time division multiplexing) scheme in which transmission is performed according to different times, and may also be performed based on an FDD (frequency division multiplexing) scheme in which transmission is performed according to different frequencies or a mixed scheme of the TDD scheme and the FDD scheme.

In addition, in wireless communication systems, standards may be developed by configuring the uplink and downlink on a single carrier or pair of carriers basis.

The uplink and downlink may transmit control information through a control channel, for example, a PDCCH (physical downlink control channel), a PUCCH (physical uplink control channel), an EPDCCH (enhanced physical downlink control channel), etc., and may be configured as a data channel, for example, a PDSCH (physical downlink shared channel), a PUSCH (physical uplink shared channel), etc., in order to transmit data.

The downlink may refer to a communication or communication path from a multi-transmission/reception point to a terminal, and the uplink may refer to a communication or communication path from a terminal to a multi-transmission/reception point. In the downlink, a transmitter may be part of a plurality of transmission/reception points, and a receiver may be part of a terminal. In the uplink, the transmitter may be part of a terminal, and the receiver may be part of a plurality of transmission/reception points.

Hereinafter, the case of transmitting and receiving a signal through a channel such as PUCCH, PUSCH, PDCCH, or PDSCH will be expressed as "transmitting or receiving PUCCH, PUSCH, PDCCH, or PDSCH".

Meanwhile, the higher layer signaling includes RRC signaling that transmits RRC information including RRC parameters.

The base station performs downlink transmission to the terminal. The base station may transmit downlink control information needed for transmission, e.g., scheduling, to receive a downlink data channel (which is the primary physical channel for unicast transmission) and schedule a physical downlink control channel for grant information transmitted on an uplink data channel. Hereinafter, transmission and reception of a signal through each channel will be described as transmission and reception of a corresponding channel.

Various access schemes may be applied to the wireless communication system without limitation. Various access schemes may be used, such as TDMA (time division multiple Access), FDMA (frequency division multiple Access), CDMA (code division multiple Access), OFDMA (orthogonal frequency division multiple Access), NOMA (non-orthogonal multiple Access), OFDM-TDMA, OFDM-FDMA, OFDM-CDMA, and so forth. Here, NOMA includes SCMA (sparse code multiple access), LDS (low cost extension), and the like.

Embodiments of the present disclosure may be applied to resource allocation in asynchronous wireless communication schemes developed to LTE and LTE advanced through GSM, WCDMA, and HSPA, and may be applied to resource allocation in synchronous wireless communication schemes evolved into CDMA, CDMA-2000, and UMB.

In this specification, MTC terminal refers to a low-cost (or less complex) terminal, a terminal supporting coverage enhancement, and the like. Alternatively, in the present specification, the MTC terminal refers to a predetermined kind of terminal defined for maintaining low cost (or low complexity) and coverage enhancement.

In other words, in this specification, an MTC terminal may refer to a newly defined 3GPP release 13 low cost (or low complexity) UE class/type, which performs LTE-based MTC-related operations. Alternatively, in this specification, an MTC terminal may refer to a UE class/type defined in or before 3GPP release 12 that supports enhanced coverage compared to existing LTE coverage or supports low power consumption, or may refer to a newly defined release 13 low cost (or low complexity) UE class/type. Alternatively, the MTC terminal may refer to a further enhanced MTC terminal defined in release 14.

In this specification, a narrowband internet of things (NB-IoT) User Equipment (UE) is a UE that supports wireless access for cellular IoT. The purpose of NB-IoT technology is to support improved indoor coverage, large-scale low-speed UEs, low latency sensitivity, very low UE cost, low power consumption, and optimized network architecture.

As representative usage scenarios of New Radio (NR) under discussion by 3GPP, enhanced mobile broadband (eMBB), large-scale machine type communication (mtc), and ultra-reliable low latency communication (URLLC) are proposed.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, sub-bands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR can be interpreted to have various meanings that have been used in the past or present, or will be used in the future.

NR (New radio)

The 3GPP has recently approved "Study on New Radio Access Technology", which is a research project for researching next generation/5G Radio Access technologies, and has started discussion on frame structure, channel coding and modulation, waveform, and multiple Access scheme for NR based thereon.

NR needs to be designed in order to meet various requirements for respective subdivided and detailed usage scenarios and improved data transmission rates compared to LTE/LTE advanced. In particular, enhanced mobile broadband (eMBB), large-scale mtc (mtc), and ultra-reliable low-latency communication (URLLC) have been proposed as representative usage scenarios of NR, and a frame structure more flexible than an LTE/LTE advanced frame structure needs to be designed as a method of satisfying the requirements of the respective usage scenarios.

In particular, consider the representative usage scenarios of NR discussed by 3GPP, eMBB, mtc, and URLLC. Since the respective usage scenarios have different requirements for data rate, delay, and coverage, a scheme for efficiently multiplexing radio resource units based on different parameter sets (e.g., subcarrier spacing, subframe, TTI, etc.) is required as a method for efficiently satisfying the requirements for the respective usage scenarios through the frequency bands constituting the predetermined NR system.

As a method therefor, discussion has been made regarding a method of multiplexing and supporting parameter sets having different subcarrier spacing (SCS) values on a TDM, FDM, or TDM/FDM basis by one NR carrier and a method of configuring a scheduling unit in the time domain to support one or more time units. In this regard, a definition of a subframe as one of time domain structures in NR is made, and it is determined that a single subframe duration including 14 OFDM symbols of a normal CP overhead based on a 15kHz subcarrier spacing (SCS), which is the same as that of LTE, is defined as a reference parameter set for defining a corresponding subframe duration. Therefore, the subframes in NR have a duration of 1 ms. However, unlike LTE, since the NR subframe is an absolute reference duration, the slot and the minislot may be defined as a time unit that is a basis of actual uplink/downlink data scheduling. In this case, the number of OFDM symbols constituting the corresponding slot, i.e., the y value, is defined to have a value of 14 regardless of the parameter set.

Thus, the predetermined slot may include 14 symbols. All of the symbols may be used for downlink transmission (DL transmission) or uplink transmission (UL transmission) according to a transmission direction of a corresponding slot, or may be used in the form of DL part + (gap) + UL part.

In addition, in the predetermined parameter set (or SCS), a micro slot including a smaller number of symbols than the number of symbols of the corresponding slot is defined. Based on this, a short time domain scheduling interval for uplink/downlink data transmission/reception may be set or a long time domain scheduling interval for uplink/downlink data transmission/reception may be set through slot aggregation.

In particular, in the case of transmission/reception of delay-critical data like URLLC, it may be difficult to satisfy the delay requirement when scheduling is performed in units of slots of 0.5ms (7 symbols) or 1ms (14 symbols) defined in the frame structure based on a parameter set having a small SCS value such as 15 kHz. Thus, minislots comprising a smaller number of OFDM symbols than corresponding slots may be defined and delay critical data like URLLC may be scheduled based on the defined minislots.

Alternatively, as described above, by supporting parameter sets having different SCS values within one carrier through multiplexing in the TDM scheme or the FDM scheme, a method of scheduling data according to delay requirements based on a time slot (or micro-slot) length defined for each parameter set is considered. For example, as shown in fig. 1, in the case where the SCS corresponds to 60kHz, the symbol length of the length is reduced to about 1/4 as compared to the case where the SCS corresponds to 15 kHz. Thus, when one slot uniformly includes 7 OFDM symbols, the corresponding slot length of 15kHz is 0.5ms, and the slot length of 60kHz is reduced to about 0.125 ms.

As described above, by defining different SCS in NR or different TTI length, discussion is made on a method of satisfying each of URLLC and eMBB.

Transport block configuration

In the LTE system, when PDSCH/PUSCH resources are allocated for predetermined LDL/UL data transmission, a Transport Block Size (TBS) for transmission through a corresponding PDSCH/PUSCH is determined based on MCS and Resource Block (RB) allocation information. When the corresponding TBS is determined, the corresponding TB is divided (segmented) into a plurality of Code Blocks (CBs) according to the maximum CB size for coding, coded by attaching CRCs in units of the corresponding CBs, and interleaved between the CBs, which results in mapping for allocated PDSCH/PUSCH resources. However, harq ack/NACK feedback for a predetermined PDSCH/PUSCH and a retransmission operation according thereto are performed in units of the TB.

In NR, since eMBB requires more resources for TBS than LTE, the number of CBs configuring one TB may increase drastically according to the definition of the maximum CB size. Therefore, there is a need to further subdivide the unit of HARQ ACK/NACK feedback and retransmission for one TB, and a need for HARQ ACK/NACK feedback and retransmission based on a Code Block Group (CBG) generated by grouping one or more CBs, or HARQ ACK/NACK feedback and retransmission in the unit of a CB is suggested.

In view of such a situation, the present disclosure proposes a technique of configuring code block combination and transmitting data when a UE and a BS transmit/receive data.

The embodiments to be described below can be applied to a UE, a BS, and a core network entity (MME) using all mobile communication technologies. For example, the present embodiment may also be applied to next generation mobile communication (e.g., 5G mobile communication or new RAT) UEs, BSs and core network entities (access and mobility functions (AMFs)), and mobile communication UEs to which LTE technology is applied. For convenience of description, the BS may represent an eNB or BS (CU, DU, or an entity implemented by one logical entity of CU and DU) of the LET/E-UTRAN in a 5G wireless network, wherein a Central Unit (CU) and a Distributed Unit (DU) are separated, i.e., the gNB.

Meanwhile, in the NR use scenario, "URLLC" refers to a service supporting high reliability and low latency, and can be used in a case where a serious problem occurs when a delay occurs during a data transmission/reception process (although transmitted/received data is not large). For example, in a case where a data transmission/reception delay becomes large, such as in the case of an autonomous vehicle, if there is a risk of loss of life and property due to a traffic accident, the URLLC service can be used.

The eMBB may be a service used when a large amount of data needs to be transmitted/received through a service supporting high-speed data transmission. For example, the eMBB service may be used when a large amount of data (e.g., 3D video or UHD service) needs to be transmitted per unit time.

mtc may be a service used when the size of transmitted/received data is not large and delay generation is not an issue but low power consumption is required. For example, a sensor device installed to construct a small city may use the mtc service because the device should operate with an inserted battery for a long time.

Hereinafter, operations of the UE and the BS according to the present embodiment will be described with reference to the drawings.

Fig. 2 is a diagram for describing an operation of a UE according to an embodiment.

Referring to fig. 2, the UE may perform a step of receiving information on the maximum number of Code Block Groups (CBGs) from the BS in S210. The information on the maximum number of code block groups includes information on the maximum number of code block groups that can be included in one transport block because the UE divides the transport block into a plurality of code blocks and configures one or more code blocks into the code block groups.

The information on the maximum number of code block groups may be received through UE-specific higher layer signaling or cell-specific higher layer signaling. For example, the information on the maximum number of code block groups may be received by the UE exclusively or the cell exclusively through RRC signaling.

The UE may perform the step of configuring the code block group by dividing the transport block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number) in S220. For example, the UE may divide one transport block configured for data transmission into N code blocks. Hereinafter, the UE may configure the code block group by grouping the N divided code blocks into M code block groups.

For example, the number of code block groups M may be determined based on a smaller number between the maximum number of code block groups and the number of code blocks N. Specifically, the UE may select a smaller value between the maximum number of code block groups received from the BS and the number N of code blocks into which the transport block is divided and may determine the number of code block groups to be a value less than or equal to the selected value. For example, when the maximum number of code block groups is configured to be 3 and received and when the number of divided code blocks is 10, the UE may select the number of code block groups as one of natural numbers equal to or less than 3. That is, the number of code block groups may be one of 1,2, and 3.

In another example, the UE 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 UE may determine the number of code blocks included in each code block group based on a value obtained by dividing the number of divided code blocks (N) by the determined number of code block groups (M).

For example, when the number of code blocks included in each code block group is determined, 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 may be determined as a value obtained by rounding up a value obtained by dividing the number of code blocks by the number of code block groups. Specifically, when the number N of code blocks is 10 and the number M of code block groups is determined to be 3, the UE may perform grouping such that 4 code blocks are included in the K code block groups based on the code block group index. For example, 4 may be a value determined using the equation ceil (N/M).

In another example, when the number of code blocks included in the code block group is determined, the number of code blocks per code block group included in each of the remaining code block groups other than the K code block groups among the M code block groups may be determined as a value obtained by rounding down a value obtained by dividing the number of code blocks by the number of code block groups. Specifically, when the number N of code blocks is 10 and the number M of code block groups is determined to be 3, the UE may perform grouping such that 3 code blocks are included in the remaining M-K code block groups except the K code block groups based on the code block group index described above. For example, 4 may be a value determined using the equation ceil (N/M). For example, 3 may be a value determined using the equation floor (N/< M).

Meanwhile, in the above embodiment, K is determined as a remainder obtained by dividing the number N of code blocks by the number M of code block groups. For example, when N is 10 and M is 3, K may be determined to be 1.

That is, when the number of code blocks is 10 and the number of code block groups is determined to be 3, the UE may perform control such that 4 code blocks are included in 1 code block group and 3 code blocks are included in the remaining 2 code block groups based on the code block group index. That is, the code blocks may be grouped such that 4 code blocks are contained in the code

block group index

0 and 3 code blocks are contained in each of the code

block group indexes

1 and 2.

Meanwhile, when the number of code blocks to be included in each code block group is determined, the UE determines the code blocks and the code block groups to include the code blocks.

For example, based on the code block group index and the number of code blocks per code block group, the controller 510 may allocate N code blocks to M code block groups and group the N code blocks according to the order of the code block indexes. Specifically, when 10 code blocks are grouped into 3 code block groups, the UE group sequentially includes the code blocks in the code block groups according to the order of the code block indexes.

Referring to fig. 3, the code block indexes CB #0 to CB #3 are groups to be included in the code block group #0, the code block indexes CB #4 to CB #6 are grouped to be included in the code block group #1, and the code block indexes CB #7 to CB #9 are grouped to be included in the code block group # 2.

Through the above operation, according to the above embodiments, the UE may divide a transport block into a plurality of code blocks and group the divided code blocks into each code block group.

The UE may perform the step of transmitting data through the transport block configured by the code block group in S230. For example, the UE attaches a CRC to each code block, groups the code blocks into a code block group, and transmits a transport block. The BS may control HARQ operations and performance of retransmission in the code block group unit.

Therefore, even if the transport block is configured to be long on the time axis, fast data processing is possible because the HARQ operation and the retransmission operation are performed in the code block group unit.

Hereinafter, an operation in the case where the BS transmits downlink data to the UE will be described based on the BS operation.

Fig. 4 is a diagram for describing a BS operation according to an embodiment.

Referring to fig. 4, the BS may perform a step of transmitting information on the maximum number of Code Block Groups (CBGs) to the UE in S400. The BS may transmit information on the maximum number of code block groups determined according to a predetermined criterion to the UE. For example, information about the maximum number of code block groups may be sent by UE-specific higher layer signaling or cell-specific higher layer signaling.

The BS may perform the step of configuring the code block group by dividing the transport block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number) in S410.

As described above, the BS may determine the number of code block groups M based on a smaller number between the maximum number of code block groups and the number of code blocks N. For example, the BS may select a smaller value between the maximum number of configured code block groups and the number N of code blocks into which the transport block is divided and may determine the number of code block groups to be less than or equal to the selected value. That is, when the maximum number of code block groups is configured to be 3 and received and when the number of divided code blocks is 10, the BS may select the number of code block groups to be a natural number equal to or less than 3. Therefore, the number of code block groups may be one of 1,2, and 3.

In addition, the BS 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 BS may determine the number of code blocks included in each code block group based on a value obtained by dividing the number of divided code blocks (N) by the determined number of code block groups (M).

For example, the number of code blocks per code block group contained in each of the first K code block groups based on the code block group index among the M code block groups may be determined as a value obtained by rounding up a value obtained by dividing the number of code blocks by the number of code block groups. Specifically, when the number N of code blocks is 10 and the number M of code block groups is determined to be 3, the UE may group the code blocks such that 4 code blocks are included in the K code block groups based on the code block group index. For example, 4 may be a value determined using the equation ceil (N/M).

In another example, a value obtained by rounding down a value obtained by dividing the number of code blocks by the number of code block groups may be determined as the number of code blocks per code block group in each inclusion of the remaining code block groups other than the K code block groups among the M code block groups. Specifically, when the number N of code blocks is 10 and the number M of code block groups is determined to be 3, the BS may group the code blocks such that 3 code blocks are included in the remaining M-K code block groups except for the K code block groups based on the code block group index described above. That is, 3 may be a value determined using the equation floor (N/< M).

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

In addition, based on the code block group index and the number of code blocks per code block group, the BS may allocate N code blocks to M code block groups according to the order of the code block indexes so as to group the code blocks. Specifically, when 10 code blocks are grouped into 3 code block groups, the BS sequentially includes the code block groups in an order according to the code block indexes. That is, as shown in fig. 3, the code blocks may be included in each code block according to the order of the indexes.

The BS may perform the step of transmitting data through the transport block configured by the code block group in S420. The BS may transmit downlink data to the UE through transport blocks that have been divided into respective code blocks grouped into code block groups based on the criteria described above.

Hereinafter, various embodiments will be described based on each operation step of the UE and the BS, in which the UE or the BS configures and transmits a code block group in order to transmit uplink data or downlink data.

Example of configuring the number of Code Block Groups (CBGs)

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

Alternatively, the number of CBGs may be determined by a function of the TBS transmitted through a predetermined PDSCH or PUSCH or a function of the number of CBs determined by the TBS and a maximum Code Block (CB) size.

Alternatively, the size of the corresponding CBG may be determined according to the number of micro slots or micro slot groups for configuring the predetermined slot.

Alternatively, the CBG may be set semi-statically for each UE through UE-specific or cell-specific higher layer signaling.

Alternatively, the CBG may be determined by a function of the number of CBGs set through UE-specific or cell-specific higher layer signaling or through L1 signaling of DCI, or the number of CBs for configuring TBs transmitted through a predetermined PDSCH or PUSCH. For example, the CBG for configuring the corresponding TB may be determined based on a smaller value or the same value between the number of CBGs (e.g., the maximum number of CBGs) set through UE-specific or cell-specific higher layer signaling or L1 signaling and the number of CBs for actually configuring the corresponding TB. That is, when one PDSCH or PUSCH is transmitted to each UE through UE-specific or cell-specific higher layer signaling or L1 signaling, the BS may indicate the maximum number of code block groups that can be configured for one TB transmitted through the corresponding PDSCH or PUSCH. In this case, the number of CBGs actually configured may be set to a smaller value or the same value between the number of CBs for configuring the corresponding TB and the maximum number of code block groups set by the BS.

Alternatively, the number and configuration of CBGs for a predetermined TB may be performed by a combination of parameters sent via UE-specific or cell-specific higher layer signaling and parameters sent by L1 control signaling (such as DL allocation DCI or UL grant). Specifically, when the BS sets a CBG reference transmission or retransmission operation through UE-specific or cell-specific higher layer signaling for a predetermined UE, the BS may perform definition to set the size of a CBB indication information region (i.e., the number of bits for configuring the corresponding CBG indication information region) to be included in DL allocation DCI or UL grant for the corresponding UE, and may perform definition to set the number of CBGs for TBs transmitted/received through PDSCH or PUSCH allocated through the corresponding DL allocation DCI or UL grant through the corresponding CBG indication information region. For example, when CBG-based PDSCH or PUSCH transmission or retransmission for a predetermined UE is set by the BS, the CBG indication information region configured by DL allocation DCI or UL grant for the corresponding UE may be a bitmap information region for indicating CBG transmitted by PDSCH or PUSCH transmission resources allocated through the corresponding DL allocation DCI or UL grant. Accordingly, the BS sets the size of the bitmap information region indicating the corresponding CBG (i.e., the number of bits for configuring the bitmap information region indicating the corresponding CBG) to be included in the DL allocation DCI or UL grant for a predetermined UE, and thus, the size of the bitmap of the CBG indication information region included in the DL allocation DCI or UL grant for the corresponding UE is determined. However, when a CBG-based transmission or retransmission operation of a PDSCH for a predetermined UE is set by the BS, the size of HARQ ACK/NACK feedback information (e.g., the number of HARQ ACK/NACK feedback bits) through the PDSCH or PUSCH of the corresponding UE may be determined according to the size of a bitmap of a CGB indication information region set through corresponding UE-specific or cell-specific higher layer signaling. As described above, when a CBG-based PDSCH or PUSCH transmission or retransmission operation for a predetermined UE is set and the size of a CBG indication information region in a DL allocation DCI or UL grant for a corresponding UE is set by a BS in a PDSCH or PUSCH transmission for the corresponding UE, the number of CBGs for configuring TBs transmitted through the corresponding PDSCH or PUSCH may be indicated by a CGB indication information region of a DL allocation DCI or UL grant for transmitting transmission resource allocation information for initial transmission of the corresponding PDSCH or PUSCH. For example, as described above, when the CBG indication information region included in the DL allocation DCI or UL grant is configured in the form of a bitmap for indicating CBGs transmitted through a PDSCH or PUSCH allocated through the corresponding DL allocation DCI or UL grant in the initial PDSCH or initial PUSCH resource allocation for a transmission or predetermined TB, the number of CBGs for configuring the corresponding TB may be implicitly indicated by the bitmap-based CBG indication information included in the corresponding DL allocation DCI or UL grant. Specifically, when the BS configures a bitmap information region for indicating a corresponding CBG, the CBG transmitted through the PDSCH or PUSCH allocated by a corresponding DL allocation DCI or UL grant may be indicated by "1". When CBGs that have not been transmitted are defined to be indicated by "0" in the configuration of the bitmap for CBGs indicating DL allocation DCI or UL grant including initial PDSCH or PUSCH resource allocation information transmitted for a predetermined TB, bits in the bitmap for indicating CBGs corresponding to the number of CBGs for the corresponding TB may be configured to be "1" from LSB or MSB, and the remaining bit(s) may be configured to be "0" and transmitted.

As described above, by various embodiments, the number of code block groups contained in one transport block may be determined.

Code block grouping method

When the number of code block groups is determined, an operation of grouping the code blocks into the code block groups should be performed. For this, various grouping methods may be applied. Hereinafter, the embodiments are classified according to the order in which the transport blocks are divided, and a more detailed code block grouping example will be described in connection with each embodiment.

Method for first dividing Code Block Group (CBG)

The predetermined TBs are preliminarily divided at a CBG level, and then the CBs are divided within the corresponding CBGs. That is, when the number of CBGs is determined according to various methods, the corresponding TBs may be configured as uniformly divided or almost uniformly divided CBGs according to the number of corresponding CBGs. When uniformly divided or almost uniformly divided CBGs are configured for TBs of a predetermined PDSCH or PUSCH, a code block may be independently configured according to a maximum CB size within each CBG. When the independent CBs are configured at the CBG level, mapping may be performed within the assigned PDSCH or PUSCH resources, with or without interleaving of CBs within each CGB. Alternatively, the interleaving or lack thereof may be set by the BS through UE-specific or cell-specific higher layer signaling or L1 control signaling.

Method for first dividing Code Block (CB)

The predetermined TBs transmitted through the predetermined PDSCH or PUSCH may be initially divided into uniformly divided or almost uniformly divided CB(s) according to a maximum CB size, and the divided CB(s) may be grouped by being sequentially mapped to CBGs according to the number of CBGs set.

For example, when N CBs, which are CB #0 to CB # (N-1), are configured as predetermined TBs and M CBGs are set for the corresponding TBs, the CBs included in each of the CBG #0 to CBG # (M-1) can be configured by applying the following equation (1). That is, the predetermined CBG # M (however, M is 0, …, M-1) is configured by CB # n satisfying equation (1).

However, [ X ] is the largest integer no greater than X. That is, [ X ] is the largest integer among integers equal to or smaller than X (e.g., floor function). However, according to equation (1), in the determination of the CB configuring each CBG, one of CB #0 to # (N-1) is cyclically mapped to each of CBG #0 to # (M-1), but the embodiment is not limited to the form of the corresponding equation. That is, all cases where CBs are sequentially mapped to each CBG in increasing order of CB index are included in the present embodiment.

More specifically, when N is 10 and M is 3, CBs may be sequentially/cyclically mapped to CBGs in increasing order of CB indices such that CBG #0 is {

CB #

0,3,6,9}, CBG #1 is {

CB #

1,4,7}, and CBG #2 is {

CB #

2,5,8 }.

In another example, in the configuration of M CBGs, the first K CBGs are configured by ceil (N/M) CBs, and the remaining (M-K) CBGs are configured by floor (N/M) CBs. However, in this case, K — N mod M. Therefore, among the total of M CBGs, the first K CBGs may be configured by sequentially grouping ceil (N/M) CBs with respect to the total of K ceil (N/M) CBs from CB #0 to CB # (K ceil (N/M) -1), and the remaining (M-K) CBGs may be configured by sequentially grouping floor (N/M) CBs with respect to the total of (M-K) · floor (N/M) CBs from CB # (K ceil (N/M)) to CB # (N-1). That is, as described above, when N is 10 and M is 3, CBG #0 is {

CB #

0,1,2,3}, CBG #1 is {

CB #

4,5,6}, and CBG #2 is {

CB #

7,8,9 }.

In another example, a method of mapping CBs configuring a predetermined CBG may be performed by equation (2) below. That is, the predetermined CBG # M (however, M is 0, …, M-1) is configured by CB # n satisfying equation (2).

However, according to equation (2), in the configuration of each CBG, each CGB is sequentially configured by [ N/M ] consecutive CBs, and the last CBG is configured by the remaining CBs. That is, CBGs from CBG #0 to CBG # (M-2) are configured by [ N/M ] consecutive CBs in the following manner: CBG #0 is configured by [ N/M ] CBs from CBG #0 to CB # N/M ] -1, CBG #1 is configured by the following [ N/M ] CBs from CB # N/M to CB #2[ N/M ] -1, and the last CBG # (M-1) is configured by the remaining CBs.

In another example, a method of configuring CBs in a reverse form of equations (1) and (2) (i.e., sequentially from the highest CBG index) may be applied.

In the above embodiments, interleaving between CBs for PDSCH/PUSCH resource mapping may be performed in units of CBGs or TBs, or localized mapping may be applied without applying interleaving. Alternatively, whether the corresponding interleaving and CBG-based or TB-based interleaving pattern is to be applied may be set to the BS by UE-specific or cell-specific higher layer signaling or L1 control signaling.

Method for mapping PDSCH/PUSCH resources

Embodiments of CBG specific resource mapping

In the method of mapping TBs to be transmitted to allocated PDSCH/PUSCH resources, resource mapping and rate matching may be set to be performed for each CBG configuring a corresponding TB. That is, in the corresponding PDSCH or PUSCH resource mapping, the allocated PDSCH or PUSCH resources may be divided according to the number of CBGs and the resource mapping, and rate matching may be performed for each CBG within the corresponding divided PDSCH or PUSCH resources.

At this time, the corresponding resource division may be set to be performed in the time domain. That is, with respect to a Transmission Time Interval (TTI) in which PDSCH or PUSCH transmission is performed, resource mapping may be set to be performed in units of uniformly or almost uniformly divided symbols (or symbol groups, minislots, minislot groups, slots, or slot groups) according to the number of CBGs.

Alternatively, the corresponding resource partitioning may be performed on the frequency domain. That is, the allocated Physical Resource Block (PRB) resources may be divided into uniformly or nearly uniformly divided sub-bands, and then resource mapping rate matching may be performed for each CBG within the corresponding sub-band. At this time, the resource mapping for each CGB of the corresponding divided region may be performed in a frequency-first manner or a time-first manner. However, in addition, the mapping of the frequency first manner or the time first manner may be set by the BS through an L1 control signal (e.g., DL allocation DCI or UL grant DCI) or UE-specific or cell-specific higher layer signaling.

Embodiments of TB specific resource mapping

Resource mapping and rate matching for transmission resources, which configure PDSCH or PUSCH allocated in units of TBs, may be performed. That is, regardless of the number of CBs or CBGs configuring a predetermined TB, a consistent resource mapping and rate matching method for allocating PDSCH/PUSCH resources for a corresponding TB transmission may be applied.

In addition, in the CBG grouping method and the resource mapping/rate matching method described above, a CBG grouping method or a resource mapping/rate matching method that the BS applies to each UE may be set. In this case, the corresponding CBG grouping method and the resource mapping/rate matching method may be independently set through separate information areas, or may be jointly set through one information area. In addition, the corresponding setting may be performed semi-statically for transmission by UE-specific or cell-specific higher layer signaling, or may be performed dynamically for transmission by L1 control signals (e.g., DL allocation DCI or UL grant DCI).

The embodiments of the steps described above may be applied independently, or all or some of them may be combined with each other and applied.

Hereinafter, configurations of the UE and the BS, which can perform all or some of the above-described present embodiments, will be described with reference to the drawings.

Fig. 5 illustrates a configuration of a UE according to an embodiment.

Referring to fig. 5, a UE 500 for transmitting data may include: a receiver 530 for receiving information on a maximum number of Code Block Groups (CBGs) from a BS; a controller 510 for configuring a code block group by dividing a transport block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number); and a transmitter 520 for transmitting data through the transport block that has been configured as the code block group.

The receiver 520 may receive information on the maximum number of code block groups through UE-specific higher layer signaling or cell-specific higher layer signaling. For example, the information on the maximum number of code block groups may be received by the UE exclusively or the cell exclusively through RRC signaling. In addition, the receiver 510 may receive downlink control information, data, and messages from the BS through corresponding channels.

The controller 510 may divide one transport block configured for data transmission into N code blocks and group the N divided code blocks into M code block groups to configure the code block groups. For example, the number of code block groups M may be determined based on a smaller number between the maximum number of code block groups and the number of code blocks N. Specifically, the controller 510 may select a smaller value between the maximum number of code block groups received from the BS and the number N of code blocks into which the transport block is divided and may determine the number of code block groups to be a value less than or equal to the selected value. In another example, the controller 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 may determine the number of code blocks included in each code block group using a value obtained by dividing the number of divided code blocks (N) by the determined number of code block groups (M).

Specifically, the controller 510 may determine a value obtained by rounding up a value obtained by dividing the number of code blocks by the number of code block groups as the number of code blocks per code block group contained in each of the first K code block groups based on the code block group index among the M code block groups. The controller 510 may determine a value obtained by rounding down a value obtained by dividing the number of code blocks by the number of code block groups as the number of code blocks per code block group contained in each of the remaining code block groups other than the K code block groups among the M code block groups. Meanwhile, in the above embodiment, K is determined as a remainder obtained by dividing the number N of code blocks by the number M of code block groups. For example, when N is 10 and M is 3, 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 controller 510 determines the code blocks and the code block groups into which the determined code blocks are to be grouped. For example, based on the code block group index and the number of code blocks per code block group, the controller 510 may allocate N code blocks to M code block groups and group the N code blocks according to the order of the code block indexes. Specifically, when 10 code blocks are grouped into 3 code block groups, the controller 510 performs grouping according to the order of code block indexes to sequentially include the code blocks in the code block groups.

In addition, according to the present embodiment described above, the controller 510 controls the overall operation of the UE 500 to transmit data according to the configuration of transport blocks into one or more code block groups.

The transmitter 530 attaches a CRC to each code block, groups the code blocks into a code block group, and transmits a transport block to the BS. In addition, the transmitter 530 transmits uplink control information, data, and messages to the BS through corresponding channels.

Fig. 6 illustrates a configuration of a BS according to an embodiment.

Referring to fig. 6, a UE 600 for transmitting data may include: a controller 610 for configuring a code block group by dividing a transport block into N code blocks (where N is a natural number) and grouping the N divided code blocks into M code block groups (where M is a natural number); and a transmitter 620 for transmitting information and data regarding a maximum number of Code Block Groups (CBGs) to the UE through the transport block that has been configured as a code block group.

The controller 610 may determine the number of code block groups M based on a smaller number between the maximum number of code block groups and the number of code blocks N. For example, the controller 610 may select a smaller value between the configured maximum number of code block groups and the number N of code blocks into which the transport block is divided and determine the number of code block groups to be a value less than or equal to the selected value. That is, when the maximum number of code block groups is configured to be 3 and the number of divided code blocks is 10, the controller 610 may select the number of code block groups to be one of natural numbers equal to or less than 3. Therefore, the number of code block groups may be one of 1,2, and 3.

In addition, the controller 610 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 610 may determine the number of code blocks included in each code block group using a value obtained by dividing the number of divided code blocks (N) by the determined number of code block groups (M). For example, the controller 610 may determine a value obtained by rounding up a value obtained by dividing the number of code blocks by the number of code block groups as the number of code blocks per code block group contained in each of the first K code block groups based on the code block group index among the M code block groups. In another example, a value obtained by rounding down a value obtained by dividing the number of code blocks by the number of code block groups may be determined as the number of code blocks per code block group contained in each of the remaining code block groups other than the K code block groups among the M code block groups. As described above, K is determined as a remainder obtained by dividing N by M, N being the number of code blocks N, M being the number of code block groups.

The controller 610 may allocate N code blocks to M code block groups based on the code block group index and the number of code blocks of each code block group according to the order of the code block indexes to group the code block groups. Specifically, when 10 code blocks are to be grouped into 3 code block groups, the BS groups the code blocks to be sequentially included in the code block groups according to the order of code block indexes.

In addition, according to the present embodiment, the controller 610 controls the overall operation of the BS 600, wherein the BS configures a transport block into one or more code block groups to transmit data.

Meanwhile, the transmitter 620 may transmit downlink data to the UE through a transport block that has been divided into respective code blocks grouped into code block groups based on the criteria described above. In addition, the transmitter 620 may transmit information on the maximum number of code block groups to the UE through UE-specific higher layer signaling or cell-specific higher layer signaling.

In addition, the transmitting unit 620 and the receiving unit 630 may be used to transmit/receive signals or messages and data required to implement the present disclosure described above to/from a terminal.

The standard contents or standard documents used in the above embodiments are omitted to make the description of the present specification concise, and constitute a part of the present specification. Accordingly, when standard content and a portion of the content of a standard document are added to the present specification or disclosed in the claims, it should be understood as falling within the scope of the present disclosure.

The above embodiments of the present disclosure have been described for illustrative purposes only, and those skilled in the art will recognize that various modifications and changes may be made to the present disclosure without departing from the scope and spirit of the present disclosure. Therefore, the embodiments of the present disclosure are not intended to be limiting but to illustrate the technical idea of the present disclosure, and the scope of the technical idea of the present disclosure is not limited by the embodiments. The scope of the present disclosure should be understood in the following manner based on the appended claims: all technical concepts that are included within the scope equivalent to the claims belong to the present disclosure.

Claims

1. A method of transmitting data by a User Equipment (UE), the method comprising:

receiving information on a maximum number of Code Block Groups (CBGs) from a Base Station (BS);

configuring a code block group by dividing a transmission block into N code blocks and grouping the N divided code blocks into M code block groups, wherein N is a natural number, wherein M is a natural number; and is

Transmitting data through the transport block configured by the code block group;

wherein the number of code block groups M is determined based on a smaller value between the maximum number of code block groups and the number of code blocks N;

wherein the number of code blocks per code block group contained in each of the first K code block groups based on the code block group index among the M code block groups is determined as a value obtained by rounding up a value obtained by dividing the number of code blocks by the number of code block groups,

the number of code blocks per code block group contained in each of the remaining code block groups other than the K code block groups among the M code block groups is determined as a value obtained by rounding down a value obtained by dividing the number of code blocks by the number of code block groups, and

k is determined from a remainder obtained by dividing N by M.

2. The method according to claim 1, wherein the information on the maximum number of code block groups is received by UE-specific higher layer signaling or cell-specific higher layer signaling.

3. The method of claim 1, wherein the configuring the code block groups comprises grouping the code block groups by allocating the N code blocks to the M code block groups according to an order of code block indexes based on a code block group index and a number of code blocks per code block group.

4. A method of transmitting data by a Base Station (BS), the method comprising:

transmitting information on a maximum number of Code Block Groups (CBGs) to a User Equipment (UE);

k is determined from a remainder obtained by dividing N by M.

5. The method according to claim 4, wherein the information on the maximum number of code block groups is sent by UE-specific higher layer signaling or cell-specific higher layer signaling.

6. The method of claim 4, wherein the configuring the code block groups comprises grouping the code block groups by allocating the N code blocks to the M code block groups according to an order of code block indexes based on a code block group index and a number of code blocks per code block group.

7. A User Equipment (UE) for transmitting data, the UE comprising:

a receiver configured to receive information on a maximum number of Code Block Groups (CBGs) from a Base Station (BS);

a controller configured to configure a code block group by dividing a transmission block into N code blocks and grouping the N divided code blocks into M code block groups, where N is a natural number, and where M is a natural number; and

a transmitter configured to transmit data through the transport block configured by the code block group;

k is determined from a remainder obtained by dividing N by M.

8. The UE of claim 7, wherein the information on the maximum number of code block groups is received through UE-specific higher layer signaling or cell-specific higher layer signaling.

9. The UE of claim 7, wherein the controller groups the code block groups by allocating the N code blocks to the M code block groups according to an order of code block indexes based on a code block group index and a number of code blocks per code block group.