KR20230050225A - Method and apparatus for ultra-reliable data transmission in communication system - Google Patents

Abstract

A highly reliable data transmission technology in a communication system is disclosed. An operating method is performed in a communication node of the communication system. The operating method comprises the following steps of: splitting a transport block into code blocks; forming a code block group with an arbitrary number of code blocks; generating an exclusive-OR code block by performing exclusive-OR on the arbitrary number of code blocks; and transmitting a code block group including the arbitrary number of code blocks and the exclusive-OR code block to a base station.

Description

High reliability data transmission method and apparatus in communication system

The present invention relates to a high-reliability data transmission technology in a communication system, and more particularly, to a high-reliability data transmission technology in a communication system that enables error correction between code blocks within a code block group composed of code blocks in a channel coding step. it's about

Along with the development of information and communication technology, various wireless communication technologies may be developed. Representative wireless communication technologies may include long term evolution (LTE), new radio (NR), 6th generation (6G), and the like specified in the 3rd generation partnership project (3GPP) standard. LTE may be one wireless communication technology among 4th generation (4G) wireless communication technologies, and NR may be one wireless communication technology among 5th generation (5G) wireless communication technologies. For the processing of rapidly increasing wireless data after the commercialization of 4G communication systems (eg, communication systems supporting LTE), the frequency band (eg, frequency bands below 6 GHz) of the 4G communication system as well as the 4G communication system A 5G communication system (eg, a communication system supporting NR) using a frequency band higher than the frequency band of (eg, a frequency band of 6 GHz or higher) may be considered. The 5G communication system may support eMBB (enhanced Mobile BroadBand), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive machine type communication).

In such a wireless communication system, high-reliability data transmission may be required in URLLC service, integration of access and backhaul (IAB), and terminal relay. Among the high reliability data transmission methods currently provided by 3GPP, one method may be a method of repetitive transmission using consecutive slots in channel coding. This repeated transmission method can reduce retransmission processing time according to hybrid automatic repeat and request (HARQ) acknowledgment (ACK)/non-acknowledgement (NACK) feedback, and can enable highly reliable data transmission. However, this repeated transmission method may lower radio resource efficiency. In addition, this repeated transmission method may be difficult to apply due to limited radio resources in IAB or terminal relay.

An object of the present invention for solving the above problems is to provide a highly reliable data transmission method and apparatus in a communication system capable of performing error correction between code blocks within a code block group composed of code blocks in a channel coding step. there is.

To achieve the above object, a high-reliability data transmission method in a communication system according to a first embodiment of the present invention is an operation method performed in a communication node of the communication system, comprising: dividing a transport block into code blocks; forming a code block group from any number of code blocks; generating an exclusive OR code block by performing an exclusive OR on the arbitrary number of code blocks; and transmitting a code block group including the arbitrary number of code blocks and the exclusive OR code block to a base station.

According to the present application, the transmission-side communication node may add an exclusive OR code block to a code block group formed using an arbitrary number of code blocks and transmit the code block to the reception-side communication node. Accordingly, the receiving-side communication node may receive the code block group to which the exclusive OR code block is added, and determine whether the code blocks are erroneous using the exclusive OR code block.

In addition, according to the present application, the receiving side communication node may perform an exclusive OR on a code block in which an error does not occur, thereby recovering an error in the code block. In addition, according to the present application, the receiving communication node may perform an exclusive OR on a code block in which an error does not occur with an exclusive OR code block, thereby recovering a CRC error of the code block.

In this way, according to the present application, it is possible to provide an error correction method between code blocks in a code block group composed of code blocks in a channel coding block. Accordingly, according to the present application, the communication system can reduce transmission delay and efficiently use radio resources compared to the repetitive transmission method using consecutive slots in channel coding.

1 is a conceptual diagram illustrating a first embodiment of a communication network.
2 is a block diagram showing a first embodiment of a communication node constituting a communication network.
3 is a conceptual diagram illustrating a first embodiment of a channel coding process in a communication system.
4 is a conceptual diagram illustrating a second embodiment of a channel coding process in a communication system.
FIG. 5 is a conceptual diagram illustrating a first embodiment of a process of generating an exclusive OR code block of FIG. 4 .
6 is a conceptual diagram illustrating a first embodiment of an error recovery process using an exclusive OR code block in a communication system.
7 is a flowchart illustrating a first embodiment of a method for transmitting highly reliable data in a communication system.
8 is a flowchart illustrating a first embodiment of a method for generating a code block group of FIG. 7 .
9 is a conceptual diagram illustrating an error recovery process of FIG. 7 according to a first embodiment.
FIG. 10 is a conceptual diagram illustrating a first embodiment of the process of combining code blocks of FIG. 9 .
FIG. 11 is a conceptual diagram illustrating a second embodiment of the process of combining code blocks of FIG. 9 .
12 is a conceptual diagram illustrating a first embodiment of a secondary error recovery process.
13 is a conceptual diagram illustrating a second embodiment of a secondary error recovery process.
14 is a conceptual diagram illustrating a third embodiment of a secondary error recovery process.

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

In embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B”. Also, in the embodiments of the present application, “one or more of A and B” may mean “one or more of A or B” or “one or more of combinations of one or more of A and B”.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail. In order to facilitate overall understanding in the description of the present invention, the same reference numerals are used for the same components in the drawings, and redundant descriptions of the same components are omitted.

1 is a conceptual diagram illustrating a first embodiment of a communication system.

Referring to FIG. 1, a communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Here, the communication system may be referred to as a “communication network”. Each of the plurality of communication nodes may support at least one communication protocol. For example, each of the plurality of communication nodes is a communication protocol based on code division multiple access (CDMA), a communication protocol based on wideband CDMA (WCDMA), a communication protocol based on time division multiple access (TDMA), and a frequency division multiple (FDMA) access) based communication protocol, OFDM (orthogonal frequency division multiplexing) based communication protocol, OFDMA (orthogonal frequency division multiple access) based communication protocol, SC (single carrier)-FDMA based communication protocol, NOMA (non-orthogonal multiple access) access)-based communication protocol, space division multiple access (SDMA)-based communication protocol, and the like may be supported. Each of the plurality of communication nodes may have the following structure.

2 is a block diagram showing a first embodiment of a communication node constituting a communication system.

Referring to FIG. 2 , a communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to a network to perform communication. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other. However, each component included in the communication node 200 may be connected through an individual interface or an individual bus centered on the processor 210 instead of the common bus 270 . For example, the processor 210 may be connected to at least one of the memory 220, the transmission/reception device 230, the input interface device 240, the output interface device 250, and the storage device 260 through a dedicated interface. .

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260 . The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may include at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may include at least one of a read only memory (ROM) and a random access memory (RAM).

Referring back to FIG. 1, the communication system 100 includes a plurality of base stations (BS) (110-1, 110-2, 110-3, 120-1, 120-2), a plurality of terminals ( terminal) (130-1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. A fourth base station 120-1, a third terminal 130-3, and a fourth terminal 130-4 may belong to the coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong within the coverage of the third base station 110-3. . The first terminal 130-1 may belong within the coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong within the coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a NodeB, an evolved NodeB, a base transceiver station (BTS), radio base station, radio transceiver, access point, access node, roadside unit (RSU), digital unit (DU), cloud digital unit (CDU) , a radio remote head (RRH), a radio unit (RU), a transmission point (TP), a transmission and reception point (TRP), a relay node, and the like. Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is an access terminal, a mobile terminal, a station, It may be referred to as a subscriber station, mobile station, portable subscriber station, user equipment (UE), node, device, and the like.

A plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) Each may support cellular communication (eg, long term evolution (LTE), advanced (LTE-A), etc. specified in the 3rd generation partnership project (3GPP) standard). Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through ideal backhaul or non-ideal backhaul, and ideal backhaul Alternatively, information can be exchanged with each other through non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to a core network (not shown) through an ideal backhaul or a non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits a signal received from the core network to a corresponding terminal 130-1, 130-2, 130-3, and 130 -4, 130-5, 130-6), and signals received from the terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 are transmitted to the core network can be sent to

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may support OFDMA-based downlink (DL) transmission, and SC-FDMA-based uplink (uplink, UL) transmission may be supported. In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits multiple input multiple output (MIMO) (eg, single user (SU)-MIMO, MU (multi user)-MIMO, massive MIMO, etc.), CoMP (coordinated multipoint) transmission, carrier aggregation transmission, transmission in unlicensed band, device to device (D2D) ) communication (or proximity services (ProSe)), etc. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is a base station (110-1, 110-2, 110-3, 120-1, 120-2) and corresponding operation, by the base station (110-1, 110-2, 110-3, 120-1, 120-2) A supported action can be performed.

For example, the second base station 110-2 can transmit a signal to the fourth terminal 130-4 based on the SU-MIMO scheme, and the fourth terminal 130-4 uses the SU-MIMO scheme. A signal may be received from the second base station 110-2. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO scheme, and the fourth terminal 130-4 And each of the fifth terminal 130-5 may receive a signal from the second base station 110-2 by the MU-MIMO method. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on the CoMP scheme, and The terminal 130-4 may receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 by CoMP. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 includes terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) and signals can be transmitted and received based on the CA method. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 coordinates D2D communication between the fourth terminal 130-4 and the fifth terminal 130-5. (coordination), and each of the fourth terminal 130-4 and the fifth terminal 130-5 communicates D2D by the coordination of the second base station 110-2 and the third base station 110-3, respectively. can be performed.

Meanwhile, in a wireless communication system, high-reliability data transmission may be required in an ultra-reliability low-latency communication (URLC) service, integration of access and backhaul (IAB), and terminal relay. Among the methods of high reliability data transmission currently provided by 3rd generation partnership project (3GPP), one method may be a method of reducing error occurrence probability by lowering spectral efficiency of a modulation coding scheme (MCS) table. In addition, among the high reliability data transmission methods provided by 3GPP, another method may be a method of transmitting the same data through a plurality of transmission and reception points (TRPs). In addition, another method among high reliability data transmission methods provided by 3GPP may be a method of repeatedly transmitting data using consecutive slots in channel coding. This repeated transmission method can reduce retransmission processing time according to hybrid automatic repeat and request (HARQ) acknowledgment (ACK)/non-acknowledgement (NACK) feedback, and can enable highly reliable data transmission. However, the repetitive transmission method using consecutive slots in such channel coding may lower radio resource efficiency. In addition, it may be difficult to apply the repetitive transmission method using consecutive slots in such channel coding due to limited radio resources in IAB or terminal relay.

Accordingly, an object of the present application may be to provide a highly reliable data transmission method in a wireless communication system. To this end, the present application can provide an error correction method between code blocks in a code block group composed of code blocks in a channel coding block. Accordingly, the high-reliability data transmission method according to the present application can reduce transmission delay and efficiently use radio resources compared to the repetitive transmission method using consecutive slots in channel coding.

3 is a conceptual diagram illustrating a first embodiment of a channel coding process in a communication system.

Referring to FIG. 3, in a channel coding process, a channel coding block of a communication node may receive a transport block (TB) in a medium access control (MAC) layer. Also, the channel coding block may generate a cyclic redundancy check (CRC) for the transport block based on the received transport block. Subsequently, the channel coding block may add the calculated CRC for the transport block to the transport block. In addition, the channel coding block may segment the transport block to which the CRC for the transport block is attached into N code blocks (code block #1 to code block #N). Here, N may be a natural number. In addition, the channel coding block may generate a CRC for code blocks for each code block divided. Then, the channel coding block may add a CRC for each code block to each code block.

In addition, the channel coding block forms K code block groups (code block group #1 to code block group #K) by forming groups with an arbitrary number of code blocks for all code blocks. can do. For example, the channel coding block forms groups of two code blocks for all code blocks (code block #1 to code block #N) to form code block groups (code block groups 1 to code block #N). A block group K) may be formed. Here, K may be a natural number.

In this case, channel coding may be performed in units of code blocks, and first transmission may also be performed in units of code blocks. However, HARQ feedback may be fed back in units of code block groups. Also, retransmission may be performed in units of code block groups. Meanwhile, the transmission-side communication node may perform channel coding on each code block and transmit the channel-coded code blocks to the transmission-side communication node. The receiving communication node can then receive the code blocks from the sending communication node. And, the receiving side communication node can determine the presence or absence of an error through a CRC check after performing decoding on a code block basis for the received code blocks. At this time, the communication node of the receiving side may correct the error in the code block in which the error is found.

4 is a conceptual diagram illustrating a second embodiment of a channel coding process in a communication system.

Referring to FIG. 4, in a channel coding process, a channel coding block of a communication node may receive a transport block from a MAC layer. Also, the channel coding block may generate a CRC for the transport block based on the received transport block. Subsequently, the channel coding block may add the calculated CRC for the transport block to the transport block. In addition, the channel coding block may divide the transport block to which the CRC for the transport block is attached into N code blocks (code block #1 to code block #N). Here, N may be a natural number. In addition, the channel coding block may generate a CRC for code blocks for each code block divided. Then, the channel coding block may add a CRC for each code block to each code block.

In addition, the channel coding block may form K code block groups (code block group #1 to code block group #K) by forming groups with an arbitrary number of code blocks for all code blocks. Here, K may be a natural number. For example, the channel coding block forms groups of two code blocks for all code blocks (code block #1 to code block #N) to form code block groups (code block group 1 to code block group K). can form

On the other hand, the channel coding block performs a bit-based exclusive OR (XOR) operation on the code blocks forming each code block group for each code block group to form an exclusive code block (XOR code). block) can be created. And, the channel coding block may add the generated exclusive code block to the last code block of each code block group.

FIG. 5 is a conceptual diagram illustrating a first embodiment of a process of generating an exclusive OR code block of FIG. 4 .

Referring to FIG. 5, in the process of generating an exclusive OR code block, a channel coding block performs a bit-based exclusive OR operation on code block #1 and code block #2 forming code block group 1 with respect to code block group 1. Thus, an exclusive OR code block can be generated.

Meanwhile, the transmitting communication node may transmit the code blocks and the exclusive OR code blocks to the receiving communication node. Then, the receiving communication node can receive the code blocks and exclusive OR code blocks from the sending communication node. Thereafter, the receiving communication node may perform a CRC check on each code block to determine whether the code block has an error. At this time, an error may occur in one code block within a code block group. In this case, the receiving communication node may attempt to recover the erroneous code by performing error correction on the erroneous code block using the exclusive OR code block included in the corresponding code block group.

6 is a conceptual diagram illustrating a first embodiment of an error recovery process using an exclusive OR code block in a communication system.

Referring to FIG. 6, in the error recovery process using the exclusive OR code block, the receiving communication node can successfully receive code block #1 belonging to code block group #1, but an error occurs with respect to code block #2. can detect Accordingly, the communication node at the reception side may perform an exclusive OR operation on the code block #1 with the exclusive OR code block to obtain the code block #2, thereby recovering the error.

7 is a flowchart illustrating a first embodiment of a method for transmitting highly reliable data in a communication system.

Referring to FIG. 7 , in a high reliability data transmission method, a base station may ask a terminal whether an exclusive OR code block can be included in a code block group and transmitted. That is, the base station may transmit an exclusive OR code block support inquiry signal to the terminal to inquire whether the exclusive OR code block is supported in the code block group (S701). Then, the terminal can receive an exclusive OR code block support inquiry signal from the base station. In this case, the terminal may notify the base station that support is possible when the terminal can include an exclusive OR code block in the code block group and transmit it. That is, the terminal may transmit a support possibility notification signal to the base station (S702).

Accordingly, the base station may receive a support possibility notification signal from the terminal. In response, the base station may notify the terminal of the number N of code blocks in the code block group (S703). Then, the terminal can receive the number N of code blocks in the code block group from the base station. Here, N may be a natural number.

Thereafter, the terminal may generate a code block group including N code blocks and an exclusive OR code block and transmit the generated code block group to the base station (S704). Then, the base station may receive a code block group including N code blocks and an exclusive OR code block from the terminal. Thereafter, the base station may perform an error recovery process on at least one code block using the exclusive OR code block (S705).

Meanwhile, the base station may generate and transmit a code block group including N code blocks and an exclusive OR code block to the terminal (S706). Then, the terminal may receive a code block group including N code blocks and an exclusive OR code block from the base station. Thereafter, the terminal may perform an error recovery process on at least one code block using the exclusive OR code block (S707). Here, when a base station becomes a receiving-side communication node, a terminal may become a transmitting-side communication node. Conversely, when a base station becomes a transmission-side communication node, a terminal may become a reception-side communication node.

8 is a flowchart illustrating a first embodiment of a method for generating a code block group of FIG. 7 .

Referring to FIG. 8, in the method of generating a code block group, a channel coding block of a communication node on the transmission side may receive a transport block from the MAC layer, generate a CRC for error checking, and add it to the transport block (S801). In this case, the size of the transport block may be T, and T may be a natural number. Also, the size of the CRC may be L. Accordingly, the channel coding block of the transmitting side may calculate B as the size of data to be transmitted by adding the size of the CRC to the size of the transport block, and in this case, B may be T+L (S802). Here, B may be a natural number.

Meanwhile, channel coding for a data channel in 3GPP NR may be performed based on low density parity check (LDPC). At this time, the size of the code block cannot exceed the predefined maximum code block size K that can be supported by LDCP. Here, K may be a natural number. In addition, the communication node of the transmission side may have previously determined the number N of code blocks in the code block group through communication with the communication node of the reception side. In this situation, the channel coding block of the transmitting side can check the size of the maximum code block and the number N of code blocks in the code block group (S803).

And, the channel coding block of the transmitting side can calculate the number G of code block groups and the size C of the code block. Here, G may be a natural number. To this end, the channel coding block of the transmitting side may set G to 1 (S804). Then, the channel coding block of the transmitting side can calculate C, which is the size of the code block, using Equation 1 with G set to 1 (S805). In Equation 1, Ceil may be a ceiling function.

Subsequently, the channel coding block on the transmitting side may determine whether C+L≤K is satisfied (S806). As a result of the determination, the channel coding block on the transmission side may determine G as 1 if C+L≤K is satisfied, and at this time, C may be determined (S808). Unlike this, the transmission-side channel coding block does not satisfy C+L?K as a result of the determination, and after G is increased by 1 (S807), step S804 may be repeated. Through this process, the channel coding block on the transmitting side can finally determine the number G of code block groups and the size C of code blocks (S808).

When this process is repeated, the number of code block groups G may correspond to the smallest integer value equal to or greater than the result of dividing the size of data B to be transmitted by N×G multiplied by the total number of code blocks N and group G. . Also, the number of code block groups G may be a minimum G value such that a value obtained by adding the size L of the CRC to the size of the code block C is smaller than the maximum code block size K. The transmitting-side channel coding block may determine the size C of the code block by using the calculated number G of code block groups.

Meanwhile, the transmitting-side channel coding block may divide the transport block to which the CRC is attached into code blocks having a code block size C (S809). In addition, the transmitting-side channel coding block may generate a code block CRC for each divided code block and add the generated code block CRC to each code block (S810). Then, the channel coding block on the transmission side may form G code block groups by forming groups with an arbitrary number of code blocks for all code blocks (S811). For example, the channel coding block forms groups of two code blocks for all code blocks (code block #1 to code block #N) to form code block groups (code block group 1 and code block group 2). can form

On the other hand, the channel coding block performs a bit-based exclusive OR (XOR) operation on the code blocks forming each code block group for each code block group to form an XOR code block can create Then, the channel coding block may add the calculated exclusive OR code block to the last code block of each code block group (S812). For example, in the process of generating an exclusive OR code block, the channel coding block on the transmission side performs a bit-based exclusive OR operation on code block #1 and code block #2 forming code block group 1 with respect to code block group 1. Exclusive OR code blocks can be created. When this process is completed, the transmitting communication node may transmit the code block groups to which the exclusive OR code block is added to the receiving communication node to the base station (S813).

9 is a conceptual diagram illustrating an error recovery process of FIG. 7 according to a first embodiment.

Referring to FIG. 9 , in an error recovery process, a channel coding block on the receiving side may receive a code block group including an exclusive OR code block and code blocks from the transmitting side (S901). Also, the receiving-side channel coding block may perform a CRC check on the code blocks of each code block group (S902) to determine whether each code block has an error (S903).

As a result of performing the CRC check on the code blocks of each code block group, the receiving side channel coding block may assemble the code blocks having a successful CRC check result to reassemble the transport block (S905).

The receiving-side channel coding block may perform a CRC check on the recombined transport block. After that, the receiving-side channel coding block may transmit a transport block having a successful CRC check to the MAC layer. In contrast, the receiving-side channel coding block performs a CRC check on the code blocks of each code block group, and when there is an erroneous code block, the error of the code block can be recovered using an exclusive OR code block. Yes (S904).

Thereafter, the receiving-side channel coding block performs a CRC check on the recovered code block, and if the CRC check is successful, the code blocks may be assembled to reassemble the transport block (S905). Also, the receiving-side channel coding block may perform a CRC check on the recombined transport block. After that, the receiving-side channel coding block may transmit a transport block having a successful CRC check to the MAC layer.

FIG. 10 is a conceptual diagram illustrating a first embodiment of the process of combining code blocks of FIG. 9 .

Referring to FIG. 10, the receiving side channel coding block performs the CRC check on code block #1 and code block #2 in code block group 1, and the CRC check may be successful. Also, the receiving-side channel coding block performs the CRC check on code block #3 and code block #4 in code block group 2, and the CRC check may be successful. In this case, the receiving side channel coding block may generate a transport block by combining code block #1 to code block #4.

FIG. 11 is a conceptual diagram illustrating a second embodiment of the process of combining code blocks of FIG. 9 .

Referring to FIG. 11, the receiving side channel coding block performs a CRC check on code block #1 in code block group 1, and the CRC check may be successful. However, since the receiving side channel coding block performs a CRC check on code block #2 in code block group 1, the CRC check may not be successful, and thus a CRC error may occur. Accordingly, the receiving-side channel coding block may generate the recovered code block #2a by recovering the code block #2 by performing the exclusive OR of the code block #1 and the exclusive OR code block. Also, the receiving-side channel coding block may perform a CRC check on the recovered code block #2a, and when the CRC check is successful, a transport block may be generated by combining the code blocks. However, when the CRC check is performed on the recovered code block #2a, the receiving-side channel coding block can perform a secondary error recovery process according to FIG. 12 if an error is found in the CRC check.

12 is a conceptual diagram illustrating a first embodiment of a secondary error recovery process.

Referring to FIG. 12 , in a secondary error recovery process, a receiving-side channel coding block may generate a secondary recovered code block #2b by performing an exclusive OR of code block #2 and a primarily recovered code block #2a. In this case, all bits of the secondarily restored code block #2b may be 0, and all of the CRC parts may be non-0. In this case, the receiving side channel coding block may determine that an error has occurred in the CRC part in relation to code block #2. Accordingly, the receiving-side channel coding block can generate a transport block using the original code block #2. After that, the receiving-side channel coding block may perform a CRC check on the transport block. In addition, the receiving side channel coding block may transmit the transport block to the MAC layer when the CRC check is successful. Alternatively, if the CRC check for the transport block fails, the channel coding block on the receiving side may feed back HARQ NACK for the code block group to which the code block #2 belongs to the transmitting communication node.

13 is a conceptual diagram illustrating a second embodiment of a secondary error recovery process.

Referring to FIG. 13 , in a secondary error recovery process, a receiving-side channel coding block may generate a secondary recovered code block #2b by performing an exclusive OR between code block #2 and primarily recovered code block #2a. At this time, all bits of the secondarily restored code block #2b may not be 0, and the CRC part may be all 0. Accordingly, the receiving-side channel coding block may determine that no error has occurred in the CRC part. And, the receiving side channel coding block can count the number of bits m which is 1 in the secondly recovered code block #2b.

When the number of bits m is equal to or less than M, the receiving side channel coding block may configure a combinable bit stream of m bits. For example, the receiving side channel coding block may substitute m bit strings 000 to 111 into the secondly recovered code block #2b when m is 3 and is smaller than M, and the secondly recovered code block #2b and code block # By performing a bit exclusive OR operation on 2, the tertiary recovered code block #2c can be generated. The receiving-side channel coding block may perform a CRC check on the tertiary recovered code block #2c, and if the CRC check result is successful, a transport block may be generated using the tertiary recovered code block. Here, M may be determined in consideration of UE performance and HARQ feedback time. The receiving-side channel coding block may perform a HARQ NACK feedback procedure when m is greater than M. Here, M may be a natural number.

14 is a conceptual diagram illustrating a third embodiment of a secondary error recovery process.

Referring to FIG. 14 , in a secondary error recovery process, a receiving-side channel coding block may generate a secondary recovered code block #2b by performing an exclusive OR between code block #2 and primarily recovered code block #2a. At this time, all bits of the secondary recovered code block #2b may not be 0, and the CRC part may also be all non-0. In this case, the receiving side channel coding block may perform a CRC check by comparing the CRC calculated using code block #2 with the CRC part of the recovered code block #2a. At this time, if the CRC check succeeds, the receiving-side channel coding block may generate a transport block using the original code block #2. In contrast, if the CRC check of the receiving-side channel coding block fails, the receiving-side channel coding block may perform the CRC check by comparing the CRC calculated using the recovered code block #2a with the CRC part of the code block #2. there is. In this case, if the CRC check succeeds, the receiving-side channel coding block may generate a transport block using the recovered code block #2a.

Accordingly, in the receiving-side channel coding block, an error may occur in the code block portion of code block #2, and if no error occurs in the CRC, the error may be restored based on this. In addition, when an error does not occur in the code block part and an error occurs in the CRC part in code block #2a, the receiving side channel coding block can recover the error based on this. In addition, in the receiving-side channel coding block, an error may occur in the code block part of code block #2a, and if an error occurs in the CRC part, the error can be restored based on this. Meanwhile, the receiving-side channel coding block may feed back HARQ NACK to the transmitting-side communication node when both the CRC check for the code block #2 and the recovered code block #2a fail.

The methods according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. Computer readable media may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on a computer readable medium may be specially designed and configured for the present invention or may be known and usable to those skilled in computer software. Examples of computer readable media may include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions may include not only machine language codes generated by a compiler but also high-level language codes that can be executed by a computer using an interpreter and the like. The hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa. In addition, the above-described method or device may be implemented by combining all or some of its components or functions, or may be implemented separately.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be done.

Claims (1)

As an operating method performed in a communication node of a communication system,
Dividing the transport block into code blocks;
forming a code block group from any number of code blocks;
generating an exclusive OR code block by performing an exclusive OR on the arbitrary number of code blocks; and
Transmitting a code block group including the arbitrary number of code blocks and the exclusive OR code block to a base station.

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