KR20230036258A - Apparatus and method for hybrid automatic repeat request feedback of heterogeneous data - Google Patents

Abstract

Disclosed is a communication node. The communication node, which performs a decryption operation in a communication system, comprises: a first temporary buffer storing a first LLR value of first initial transmission data having a first RV; a second temporary buffer; DERM obtaining the first LLR value stored in the first temporary buffer, obtaining a second LLR value of second initial transmission data having a second RV from a modem of the communication node, generating a third LLR value by combining the first LLR value and the second LLR value, and storing the third LLR value in the second temporary buffer; a deinterleaver obtaining the third LLR value stored in the second temporary buffer and performing deinterleaving of the third LLR value; and at least one turbo decoder obtaining the deinterleaved third LLR value from the deinterleaver and performing decoding using the third LLR value. The present invention aims to provide a hybrid-automatic repeat request (HARQ) feedback device and method for heterogeneous data in a communication system.

Description

Apparatus and method for HARQ feedback on heterogeneous data

The present application relates to a technology for HARQ (Hybrid Automatic Repeat Request) feedback in a communication system, and more particularly, when a terminal receives heterogeneous data in an HARQ procedure, the terminal It relates to a technique for performing decryption.

When data is transmitted through a wireless channel between a transmitter and a receiver, a transmission error may occur if the quality of a received signal received by the receiver from the transmitter changes or noise or interference occurs in the receiver. Errors caused by changes in the quality of a received signal can be controlled through a link adaptation method, but errors caused by changes in receiver noise and/or unpredictable interference can be difficult to control using only the link adaptation method. there is. Accordingly, the communication system may use various error control methods to supplement transmission errors and secure communication reliability.

On the other hand, when HARQ (Hybrid Automatic Repeat Request) feedback procedures for different types of data are performed in the receiver, when the HARQ feedback procedures for each type of data are stored in the memory of different HARQ entities and performed, each type of The complexity of the receiver may increase in order to design sufficient HARQ entities for the HARQ feedback procedure of data. In addition, when the HARQ feedback procedure for each type of data is being performed in all HARQ entities, there is a problem in that the HARQ feedback procedure for other types of data cannot be performed.

An object of the present application to solve the above problems is to provide a hybrid-automatic repeat request (HARQ) feedback device and method for heterogeneous data in a communication system.

In order to achieve the above object, a communication node performing a decryption operation in the communication system according to the first embodiment of the present application stores a first LLR value of first initial transmission data having a first redundancy version (RV). 1 temporary buffer; a second temporary buffer; The first LLR value stored in the first temporary buffer is obtained, and a second LLR value of second initial transmission data having a second RV is obtained from a modem (MODEM) of the communication node, and the first LLR value and a DERM combining the second LLR values to generate a third LLR value and storing the third LLR value in the second temporary buffer; a de-interleaver that obtains the third LLR value stored in the second temporary buffer and performs de-interleaving of the third LLR value; and at least one turbo decoder that obtains the deinterleaved third LLR value from the deinterleaver and performs decoding using the third LLR value.

According to the present application, when a terminal receives the same type of data as previously received data from a base station in a downlink HARQ (Hybrid-Automatic Repeat Request) procedure, the terminal decodes the received data. can be performed

In addition, according to the present application, even when a terminal receives data of a different type from previously received data from a base station in a downlink HARQ procedure, decoding of received data may be performed by the terminal.

1 is a conceptual diagram illustrating a first embodiment of a communication system.
2 is a block diagram showing a first embodiment of a communication node constituting a communication system.
3 is a conceptual diagram illustrating a first embodiment of a downlink radio resource region structure of a communication system.
4 is a conceptual diagram illustrating a first embodiment of a radio interface protocol of a Narrow Band Internet of Things (NB-IoT) communication system.
5 is a conceptual diagram illustrating a second embodiment of a downlink radio resource region structure of a communication system.
6 is a block diagram illustrating a first embodiment of a communication node performing a decryption operation in a communication system.
7 is a block diagram illustrating a first embodiment of a DERM included in a communication node performing a decryption operation in a communication system.

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

Terms to be described later are defined in consideration of functions in the present invention, and may be called differently according to the intention of a client, operator, user, or precedent. Therefore, definitions of terms will have to be made based on the content throughout this specification.

Terms such as first and second may be used to describe various components, but the components may not be limited by the terms. The terms may only be 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 application. The terms and/or may 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". In addition, 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 application. Singular expressions may 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 may be understood that it does not preclude the possibility of existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

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 this application 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

A communication system to which embodiments according to the present application are applied will be described. The communication system includes a 4 ^th generation (4G) communication system (eg, a Long-Term Evolution (LTE) communication system, an Advanced (LTE-A) communication system), a 5 ^th generation (5G) communication system (eg, NR (New Radio) communication system) and/or ^6th generation (6G) communication system. The 4G communication system can support communication in a frequency band of 6 GHz or less, and the 5G communication system can support communication in a frequency band of 6 GHz or more as well as a frequency band of 6 GHz or less.

Communication systems to which embodiments according to the present application are applied are not limited to those described below, and embodiments according to the present application may be applied to various communication systems. Here, the communication system may be used in the same sense as a communication network, "LTE" may indicate "4G communication system", "LTE communication system" or "LTE-A communication system", and "NR" may indicate "5G communication system" or "NR communication system".

Throughout the specification, a network refers to, for example, wireless Internet such as WIFI, portable Internet such as WiBro (Wireless Broadband internet) or WiMax (World interoperability for Microwave access), GSM (Global System for Mobile communication) or CDMA (Code Division Multiple Access). ) or 3G (3 ^th generation) mobile communication network such as CDMA2000, 3.5G (3.5 ^th generation) mobile communication network such as HSDPA (High Speed Downlink Packet Access) or HSUPA (High Speed Uplink Packet Access), LTE network or LTE-A It may include the same 4G mobile communication network, 5G mobile communication network, and/or 6G mobile communication network.

Throughout the specification, a terminal (or terminal) is a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user equipment, an access It may refer to an access terminal, etc., and may include all or some functions of a terminal, mobile station, mobile terminal, subscriber station, portable subscriber station, user device, access terminal, and the like.

The above-described terminal is a desktop computer capable of communication, a laptop computer, a tablet PC, a wireless phone, a mobile phone, a smart phone, and a smart watch. (smart watch), smart glass, Internet of Things (IoT), e-book reader, PMP (Portable Multimedia Player), portable game device, navigation device, digital camera, DMB (Digital Multimedia Broadcasting) player, digital audio recorder, digital audio player, digital picture recorder, digital picture player, digital video player It may refer to various devices that can be used by users of mobile communication services, such as players).

Throughout the specification, a base station includes an access point, a radio access station, a node B, an evolved node B, a base transceiver station, and an MMR. -BS (Mobile Multi-hop Relay - Base Station), etc., and may include all or some of the functions of a base station, access point, wireless access station, NodeB, eNodeB, transmission/reception base station, MMR-BS, etc. there is.

Throughout the specification, downlink (DL) may mean a radio transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) may mean a radio transmission path of a signal transmitted from a terminal to a base station. can

Throughout the specification, heterogeneous data (i.e., different types of data) refers to a terminal receiving first data and a terminal receiving second data in a Hybrid-Automatic Repeat Request (HARQ) procedure, When the aforementioned redundancy version (RV) of the first data is different from the aforementioned RV of the second data, the aforementioned first data and/or the aforementioned second data may be referred to. In addition, heterogeneous data throughout the specification is when the terminal receives the first data and the terminal receives the second data in the HARQ procedure, and the NDI (New Data Indicator) of the above-described second data is toggled. It may refer to the aforementioned first data and/or the aforementioned second data.

On the other hand, in the entire specification, the same type of data is that the terminal receives the first data and the terminal receives the second data in a HARQ (Hybrid-Automatic Repeat Request) procedure, and the RV of the above-described first data and the above-described second data When the RV of the two data is the same, it may refer to the above-described first data and/or the above-described second data. In addition, in the entire specification, heterogeneous data refers to the case where the terminal receives the first data and the terminal receives the second data in the HARQ procedure, and the NDI of the above-described second data is not toggled, and Alternatively, it may refer to the aforementioned second data.

Hereinafter, 3GPP (3 ^rd Generation Partnership Project) LTE (Long Term Evolution) / LTE-A system as an example of a wireless access system in which embodiments of the present application can be used, as well as 3GPP NB-IoT (Narrow Band Internet of Things) and/or a 3GPP NR system. Hereinafter, in order to clarify the description of the present application, it is described based on a 3GPP communication system (LTE, NR, etc.), but the technical spirit of the present application is not limited thereto.

Hereinafter, a communication system to which an embodiment of the present application can be applied and operating methods of a communication node included in the above-described communication system will be described. Even when a method (for example, transmission or reception of a signal) performed in a first communication node among communication nodes is described, a second communication node corresponding thereto is described as a method performed in the first communication node and a method (eg, signal transmission or reception) For example, receiving or transmitting a signal) may be performed. That is, when the operation of the terminal is described, the corresponding base station may perform an operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, a terminal corresponding thereto may perform an operation corresponding to the operation of the base station.

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). In addition, the communication system 100 includes a core network (eg, a serving-gateway (S-GW), a packet data network (PDN)-gateway), and a mobility management entity (MME)). can include more. If the communication system 100 is a 5G communication system (eg, NR system), the core network may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), and the like there is.

The plurality of communication nodes 110 to 130 may support communication protocols (eg, LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.) defined in the 3GPP standard. The plurality of communication nodes 110 to 130 are CDMA technology, WCDMA (Wideband CDMA) technology, TDMA (time division multiple access) technology, FDMA (Frequency Division Multiple Access) technology, OFDM (Orthogonal Frequency Division Multiplexing) technology, Filtered OFDM technology, CP (Cyclic Prefix)-OFDM technology, DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) technology, OFDMA (Orthogonal Frequency Division Multiple Access) technology, SC (single carrier)-FDMA technology, NOMA (Non- Orthogonal Multiple Access) technology, GFDM (Generalized Frequency Division Multiplexing) technology, FBMC (Filter Bank Multi-Carrier) technology, UFMC (Universal Filtered Multi-Carrier) technology, SDMA (Space Division Multiple Access) technology, and the like can 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 a transmission 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.

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 mean a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present application 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 110-1, 110-2, 110-3, 120-1, and 120-2, a plurality of terminals 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. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the cell 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 cell 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 to the cell coverage of the third base station 110-3. there is. The first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the cell 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 NB (NodeB), an eNB (evolved NodeB), a gNB, an ABS (Advanced Base Station), HR -BS (High Reliability-Base Station), BTS (Base Transceiver Station), radio base station, radio transceiver, access point, access node, RAS (Radio Access Station) ), MMR-BS, RS (Relay Station), ARS (Advanced Relay Station), HR-RS (High Reliability-Relay Station), HNB (Home NodeB), HeNB (Home eNodeB), RSU (Road Side Unit), RRH (Radio Remote Head), TP (Transmission Point), TRP (Transmission and Reception Point), and the like.

Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 includes User Equipment (UE), Terminal Equipment (TE), Advanced Mobile Station (AMS), HR-MS (High Reliability-Mobile Station), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, mobile subscriber station ( It may be referred to as a portable subscriber station), a node, a device, an On Board Unit (OBU), and the like.

Meanwhile, 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 an ideal backhaul link or a non-ideal backhaul link, and , information can be exchanged with each other through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to the core network through an ideal backhaul link or a non-ideal backhaul link. 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 corresponding terminals 130-1, 130-2, 130-3, 130-4, 130-5, 130-6 are transmitted to the core network can be sent to

In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits MIMO (eg, single user (SU)-MIMO, multi-user (MU)- MIMO, massive MIMO, etc.), CoMP (Coordinated Multi-Point) transmission, Carrier Aggregation (CA) transmission, transmission in an unlicensed band, device to device communication (D2D) (or ProSe (Proximity Services)), IoT (Internet of Things) communication, dual connectivity (DC), and the like may be supported. 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 operations supported by the base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may 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 a terminal 130-1, 130-2, 130-3, and 130-4 belonging to its own cell coverage. , 130-5, 130-6) and a CA method. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 controls D2D between the fourth terminal 130-4 and the fifth terminal 130-5. and each of the fourth terminal 130-4 and the fifth terminal 130-5 may perform D2D under the control of the second base station 110-2 and the third base station 110-3, respectively. .

When data is transmitted through a wireless channel between a transmitter and a receiver, a transmission error may occur if the quality of a received signal received by the receiver from the transmitter is changed. Errors caused by changes in the quality of the received signal can be controlled to some extent through the link adaptation method, but errors due to changes in noise and/or unpredictable interference in the receiver can be controlled by the link adaptation method alone. It can be difficult to do. Accordingly, the communication system may use various error control methods to secure communication reliability by supplementing transmission errors.

Forward Error Correction (FEC) is an error control method in which a transmitter adds a bit for error correction to data to be transmitted. The transmitter may add extra redundancy calculated from information bits of the above-described data to data to be transmitted and transmit the data to the receiver. When an error is found in the data received from the transmitter, the receiver may perform error detection and/or error correction based on the aforementioned redundancy.

Automatic Repeat Request (ARQ) is an error control method based on a scheme in which a receiver requests a transmitter to retransmit. The receiver may use Cyclic Redundancy Check (CRC) to determine whether data received from the transmitter has an error. When there is no error in the data received from the transmitter, the receiver may transmit an ACK (Acknowledgement) signal to the transmitter to inform that there is no error in the received signal. On the other hand, when there is an error in the received data, the transmitter may request retransmission by transmitting a negative acknowledgment (NACK) signal to the transmitter. When the transmitter receives the NACK signal from the receiver, the transmitter may retransmit the same data to the receiver in response.

HARQ is an error control method that combines the above-described FEC and the above-described ARQ. The receiver may attempt error correction on data received from the transmitter, and the receiver may detect errors in data using CRC. When an error is detected in data, the receiver may transmit a NACK signal to the transmitter. When the transmitter receives the aforementioned NACK signal, it may transmit retransmission data to the receiver. When receiving retransmission data from the transmitter, the receiver can control errors by combining 'initial transmission data', which is data first received from the transmitter, and 'retransmission data', which is data received in retransmission, and decoding the data.

The above-described HARQ procedure may be performed based on a Chase Combining (CC) method or an Incremental Redundancy (IR) method. When the HARQ retransmission procedure according to the CC method is performed in the transmitter, the transmitter may repeatedly transmit the same data. In this case, the receiver may decode data by combining the same received data. Meanwhile, when the HARQ retransmission procedure according to the IR method is performed in the transmitter, the transmitter may transmit data having different RVs. The receiver may decode data by combining received data having different RVs. Hereinafter, a downlink radio resource region structure of an LTE communication system to which an embodiment of the present application can be applied will be described.

3 is a conceptual diagram illustrating a first embodiment of a radio resource region structure in downlink in a communication system.

개의 심볼이 하나의 슬롯을 구성할 수 있으며, 2개의 슬롯은 하나의 서브프레임(subframe)을 구성할 수 있다. 서브프레임의 길이는 1ms일 수 있으며, 프레임은 10개의 서브프레임들로 구성될 수 있다. 주파수 영역에서의 최소 자원 단위는 부반송파(subcarrier)로서, 부반송파 간격(Subcarrier Spacing; SPS)는 15kHz일 수 있다.Referring to FIG. 3, the minimum resource unit in the time domain in the downlink of the communication system is an OFDM symbol,

Symbols may constitute one slot, and two slots may constitute one subframe. The length of a subframe may be 1ms, and a frame may consist of 10 subframes. The minimum resource unit in the frequency domain is a subcarrier, and a subcarrier spacing (SPS) may be 15 kHz.

Control information transmitted through downlink may include a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical HARQ Indicator Channel (PHICH), and a Physical Control Format Indicator Channel (PCFICH). The base station may transmit downlink control information (DCI) scrambled with a random access radio network temporary identifier (RA-RNTI) to the terminal through the PDCCH. The UE may receive the DCI scrambled with the RA-RNTI from the BS through the aforementioned PDCCH.

The DCI described above may include scheduling information for control channel downlink data and/or uplink data. The above-described DCI may include resource block assignment, modulation and coding scheme (MCS), HARQ process identifier (HARQ process identifier), new data indicator, and/or RV information of HARQ. there is. The above-described NDI may inform the receiver of whether data transmitted in the HARQ process transmitted by the transmitter is initial transmission.

For example, when the NDI of downlink data transmitted from the base station to the terminal is toggled, the above-described data may be initial transmission data different from data previously transmitted from the base station to the terminal. On the other hand, when the NDI of downlink data transmitted from the base station to the terminal is not toggled, the above-described data may be retransmitted data identical to data previously transmitted from the base station to the terminal. At this time, even when the terminal receives heterogeneous initial transmission data in the HARQ process or when NDI toggled data is received, an apparatus and/or method for HARQ feedback for decoding the aforementioned heterogeneous initial transmission data is required. can

Next, Internet of Things (NB-IoT) communication technologies will be described. Here, even when a method performed in a first communication node among communication nodes (for example, transmission or reception of a signal) is described, the second communication node corresponding thereto is a method performed in the first communication node and a method corresponding thereto. (eg, receiving or transmitting a signal). That is, when the operation of the terminal is described, the corresponding base station may perform an operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, a terminal corresponding thereto may perform an operation corresponding to the operation of the base station.

NB-IoT, an IoT communication system using the 3GPP LTE communication system, is receiving a lot of attention. NB-IoT supports three operating modes: in-band, guard band, and stand-alone, and the same requirements can be applied. The in-band mode allocates and operates some of the resources within the LTE band to NB-IoT, and the guard-band mode utilizes the LTE guard frequency band and places the NB-IoT carrier as close as possible to the edge subcarrier of LTE. can The independent mode can be operated by separately allocating some carriers within the GSM (Global System for Mobile communications) band. Next, the radio interface protocol of the NB-IoT communication system can be described.

4 is a conceptual diagram illustrating an air interface protocol of a 3GPP NB-IoT communication system.

Referring to FIG. 4, the layer of the air interface protocol between the IoT device (hereinafter referred to as a terminal) and the base station (including the core network) is based on the lower three layers of the open system interconnection (OSI) model widely known in the communication system. It indicates that it is divided into a first layer (layer 1; L1), a second layer (layer 2; L2), and a third layer (layer 3; L3). The protocol stack of NB-IoT is basically based on the structure of the 3GPP LTE protocol stack and is modified to suit IoT communication.

In the protocol stack of NB-IoT, the air interface protocol between the terminal and the base station can be horizontally divided into physical layer, data link layer and network layer, and vertically for control information transmission It can be divided into a control plane, which is a protocol stack, and a user plane, which is a protocol stack for transmitting data (also referred to as user data or traffic) information.

L1 is a physical layer (PHY) 410 . The physical layer 410 may provide an information (data and control information) transmission service to an upper layer through a physical channel. The physical layer 410 may be connected to a media access control (MAC) layer 420 as an upper layer through a transport channel (that is, a physical channel may be mapped to a transport channel). Data and control information may be transmitted between the MAC layer 420 and the physical layer 410 through a transport channel. Data and control information between different physical layers, that is, between the physical layer 410/470 of the transmitting device and the physical layer 470/410 of the receiving device may be transmitted using radio resources through a physical channel. In the physical layer 410, a physical control channel may be used to transfer control information in addition to data.

The PDCCH may be used to transmit resource allocation information of a paging channel (PCH) and a downlink shared channel (DL-SCH), and HARQ information related to the DL-SCH to the UE. In addition, the PDCCH may include a UL grant, which is information about resource allocation for uplink transmission. The PCFICH may convey the number of OFDM symbols used for the PDCCH to the UE. The PHICH may be used to convey HARQ ACK/NACK information for uplink shared channel (UL-SCH) transmission. A physical uplink control channel (PUCCH) may transmit UL control information such as HARQ ACK/NACK for downlink transmission, scheduling request, and channel quality indicator (CQI).

In NB-IoT, the HARQ process performed by the base station and / or terminal may be similar to the 3GPP LTE scheme. However, the HARQ process performed in NB-IoT uses the same messages as LTE, but may use parameters different from those of LTE. In addition, in NB-IoT, the base station may transmit RV0 data and RV2 data together to the terminal in initial transmission in order to reduce the number of retransmissions. Accordingly, the UE may need an apparatus and/or method for HARQ feedback capable of decoding initial transmission data having different RVs.

5 is a conceptual diagram illustrating a second embodiment of a downlink radio resource region structure of a communication system.

2^n (n=0, 1, 2, 3, 4), 즉, 15kHz, 30kHz, 60kHz, 120kHz 또는 240kHz를 가질 수 있다. 리소스 블록(Resource Block; RB)는 12개의 부반송파로 구성될 수 있다.Referring to FIG. 5, the minimum transmission unit in the downlink time domain of the communication system is an OFDM symbol, and 14 OFDM symbols can configure one slot, and for an extended cycle prefix (CP). 12 OFDM symbols may constitute one slot. The length of a subframe may be 1ms, and a frame may consist of 10 subframes. The minimum transmission unit in the downlink frequency domain is a subcarrier, and the subcarrier interval is 15 kHz.

2^n (n=0, 1, 2, 3, 4), i.e. 15 kHz, 30 kHz, 60 kHz, 120 kHz or 240 kHz. A resource block (RB) may consist of 12 subcarriers.

The base station may transmit a PDCCH to the terminal through downlink, and the terminal may receive the PDCCH from the base station through downlink. The base station may transmit downlink control information scrambled with RA-RNTI to the terminal through the PDCCH. The UE may receive the DCI scrambled with the RA-RNTI from the BS through the aforementioned PDCCH.

The DCI described above may include scheduling information and/or HARQ ACK/NACK signals for control channel downlink data and/or uplink data, and the above-described DCI may include DCI according to the type of downlink control information to be transmitted. It can be composed of one of formats 1_0, 1_1 and 1_2. For example, DCI to which DCI format 1 is applied may include resource block allocation, modulation and coding scheme, HARQ process ID, new data indicator, and/or HARQ RV information.

The above-described NDI may inform the receiver of whether data transmitted in the HARQ process transmitted by the transmitter is initial transmission. Initial transmission may be performed on resources of MSGA payload signaled in PDCCH, random access response and/or RRC.

For example, when the NDI of downlink data transmitted from the base station to the terminal is toggled, the above-described data may be initial transmission data different from data previously transmitted from the base station to the terminal. On the other hand, when the NDI of downlink data transmitted from the base station to the terminal is not toggled, the above-described data may be retransmitted data identical to data previously transmitted from the base station to the terminal.

Meanwhile, the MAC entity may include at least one HARQ entity for at least one serving cell, and the at least one HARQ entity may perform at least one HARQ process. At least one HARQ process may be associated with at least one HARQ process ID. HARQ entities may manage HARQ information related to at least one HARQ process and/or transport blocks (TBs) received from the DL-SCH. At this time, at least one HARQ process may be associated with each HARQ buffer.

The above-described MAC entity may decode the above-described data when receiving initial transmission data, and when the initial transmission data is successfully decoded, the MAC entity may deliver the above-described PDU of the decoded data to an upper layer. On the other hand, when retransmission data is received because the initial transmission data is not normally received, the above-described MAC entity may instruct the physical layer to decode the data by combining the above-mentioned retransmission data with the data stored in the soft buffer. can

The physical layer of the terminal may store the Log-Likelihood Ratio (LLR) value obtained by decoding the initial transmission data in a soft buffer, and the physical layer of the terminal performs a cyclic redundancy check on the stored data through a turbo decoding process. so that errors can be detected. When an error is detected in the physical layer of the terminal, the terminal may transmit a NACK signal to the base station, and when the base station receives the NACK signal from the terminal, the base station transmits retransmission data corresponding to the feedback of the above-described initial transmission data to the terminal. can The physical layer of the terminal may perform decoding according to the turbo decoding algorithm by combining the retransmitted data with the data stored in the soft buffer described above. In the 5G communication system, a terminal may need an apparatus and / or method for HARQ feedback capable of decoding initial transmission data having different RVs.

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

Embodiments of the present application may be applied to 3G, 4G LTE, 4G LTE-A, NB-IoT, 5G, 5G NR and / or 6G communication systems having similar technical backgrounds or channel types. In addition, the embodiments of the present application can be applied to other communication systems through some modification without significantly departing from the scope of the present invention as determined by a person having skillful technical knowledge.

6 is a block diagram illustrating a first embodiment of a communication node performing a decryption operation in a communication system.

Referring to FIG. 6, the communication node 600 performing a decryption operation in the communication system includes an HARQ buffer HBUF 601 that stores data, an HREAD 602 that reads data stored in the above-described HBUF, and/or Alternatively, at least one temporary buffer for temporarily storing data (eg, TBUF0 603 and/or TBUF1 604) may be included. In addition, the communication node 600 performing a decoding operation in the communication system is a DERM 606 that obtains an LLR value from a modem demodulator, and a MOVE that transfers the LLR value to the HBUF 601 and/or DEINT 607. 605, DEINT 607, which is a de-interleaver that demodulates interleaved data by performing de-interleaving at the transmitter, and/or at least one for decoding the interleaved data. of turbo decoders (eg, TDEC0 608 and/or TDEC1 609).

값을 시작 어드레스로 사용하여 저장될 수 있고, 0 번지부터

번지까지 모두 0 값이 저장될 수 있다. The HBUF 601 is a buffer for storing data used in the HARQ process and may include a memory. In the HBUF 601, a received column of data transmitted to the decoder may be stored, and the data transmitted from the DERM 606 may be stored.

It can be stored using the value as the starting address, starting from address 0.

All 0 values can be stored up to the address.

The HREAD 602 may read data stored in the HBUF 601. HREAD 602 may transfer data read from HBUF 601 to TBUF0 603 and/or TBUF1 604. HREAD 602 may transfer data stored in HBUF 601 to DERM 606 through TBUF0 603 and/or TBUF1 604.

TBUF0 603 and/or TBUF1 604 are buffers for performing HARQ feedback procedures and may include memory. In TBUF0 603 and/or TBUF1 604, each row of received data transmitted from DERM 606 and each row of data of HBUF 601 stored from HREAD 602 may be combined and stored. That is, the result of adding the data of the HBUF 601 and the data transmitted from the DERM 606 may be stored in the TBUF0 603 and/or the TBUF1 604.

The MOVE 605 may obtain data from the TBUF0 603 and/or TBUF1 604 and transfer the data obtained from the TBUF0 603 and/or TBUF1 604 to the HBUF 601. MOVE 605 may obtain data from TBUF0 603 and/or TBUF1 604, and may transfer the data acquired from TBUF0 603 and/or TBUF1 604 to DEINT 607.

DERM (606) can receive data from the modem demodulator, DERM (606) can acquire data stored in HBUF (601) through HREAD (602), and DERM (606) can obtain TBUF0 (603) and / Alternatively, data stored in TBUF1 604 may be obtained. The data obtained from the modem demodulator and the DERM 606 may generate new LLR value data by combining the data acquired from TBUF0 603 and/or TBUF1 604. The data obtained from the DERM 606 modem demodulator and the DERM 606 may transmit a new LLR value generated by combining the data obtained from the TBUF0 603 and/or TBUF1 604 to the MOVE 605.

7 is a block diagram illustrating a first embodiment of a DERM 606 included in a communication node performing a decryption operation in a communication system.

Referring to FIG. 7 , a DERM 606 included in a communication node performing a decryption operation in a communication system may include a PCTL 701 , an RDCTL 702 , and/or a WRCTL 703 . The RDCTL 702 can read the memory in which the LLR value delivered from the modem demodulator is stored (S701), and the RDCTL 702 can transfer the LLR value obtained from the modem demodulator to the PCTL 701. The PCTL 701 may calculate the number of dummy bits and/or filler bits of received data and transmit the count to the RDCTL 702 . The RDCTL 702 may generate data based on the number of dummy bits and/or filler bits obtained from the PCTL 701, and the RDCTL 702 converts the number of dummy bits and/or filler bits to the WRCTL 703. ) can be passed on.

The WRCTL 703 may obtain the LLR value stored in TBUF0 603 and/or TBUF1 604. The WRCTL 703 may combine the LLR value stored in the TBUF with the LLR value obtained from the RDCTL 702 and transmit it to the TBUF0 603 and/or the TBUF1 604. In the WRCTL 703, an operation to read the LLR value in the TBUF 601, an operation to combine the LLR value read from the above-described TBUF with a new LLR value transmitted from the modem demodulator, and an operation to transfer the combined LLR value to the TBUF One or more of the actions may be performed.

The RDCTL 702 may store the LLR value transmitted from the modem demodulator in memory, and the RDCTL 702 reads the LLR value stored in the memory and determines the number of bits of actual data, the position of filler bits, and/or the position of dummy bits. Taking this into account, data may be newly reconstructed based on the above-described LLR value.

Referring back to FIG. 6 , the DEINT 607 may obtain data from the MOVE 605, and the DEINT 607 may deinterleave the data obtained from the MOVE 605. That is, when the bit sequence of data is interleaved in a pseudo-random format, the DEINT 607 can rearrange data by performing a deinterleaving process corresponding to the inverse operation of interleaving. there is. DEINT 607 may transfer the above-described deinterleaved data to TDEC0 608 and/or TDEC1 609.

TDEC0 (608) and/or TDEC1 (609) may obtain data from DEINT (607), and TDEC0 (608) and/or TDEC1 (609) may obtain a turbo decryption algorithm based on the data obtained from DEINT (607). Decoding may be performed according to (turbo decoding algorithm). The TDEC0 (608) and/or the TDEC1 (609) may perform decryption of the data obtained from the DEINT (607) and deliver decoded data generated to the RDOUT (610).

RDOUT (610) can obtain decoded data from TDEC0 (608) and / or TDEC1 (609), and RDOUT (610) outputs the decoded data obtained from TDEC0 (608) and / or TDEC1 (609) to the outside can do. In addition, the RDOUT 610 may perform CRC calculation based on the decoded data obtained from the TDEC0 608 and/or TDEC1 609, and match the CRC calculation value of the decoded data with the CRC value included in the received data. Based on whether or not there is an error in the received data, it is possible to output to the outside.

When the decoding operation of the received data of the terminal starts, the communication node 600 performing the decoding operation in the communication system converts the first LLR value stored in the HBUF 601 to TBUF0 603 and/or TBUF1 ( 604). At this time, when the first data is initial transmission data or when the NDI of the first data is toggled, the HREAD 602 included in the communication node 600 performing the decoding operation in the communication system is TBUF0 603 and/or As the first LLR value stored in TBUF1 604, a '0' value may be moved.

The DERM 606 may acquire a second LLR value, which is an LLR value of the first data, from the modem demodulator (S601). The DERM 606 may obtain the second LLR value stored in the TBUF0 603 and/or the TBUF1 604 (S602), and the DERM 606 may obtain the above-described first LLR value and the above-described second LLR value. may be combined to generate a third LLR value. DERM 606 may deliver the above-described third LLR value to TBUF0 603 and/or TBUF1 604. TBUF0 (603) and / or TBUF1 (604) can obtain the above-described third LLR value from the DERM (606), and TBUF0 (603) and / or TBUF1 (604) can store the above-described third LLR value Yes (S603).

MOVE 605 may obtain the above-described third LLR value from TBUF0 603 and/or TBUF 604, and MOVE 605 may transmit the above-described third LLR value to HBUF 601, MOVE 605 may transfer the aforementioned third LLR value to DEINT 607 . The HBUF 601 may store the above-described third LLR value acquired from the MOVE 605. The third LLR value stored in HBUF 601 may be updated to be the same as the third LLR value transmitted to DEINT 607 .

DEINT 607 may deinterleave the above-described first data based on the above-described third LLR value from MOVE 605, and DEINT 607 transmits the deinterleaved first data to TDEC0 608 and/or It can be passed to TDEC1 (609). TDEC0 608 and/or TDEC1 609 may obtain deinterleaved first data from DEINT 607 . The TDEC0 608 and/or the TDEC1 609 may generate first decoded data by decoding the deinterleaved first data according to the turbo decoding algorithm, and the TDEC0 608 and/or the TDEC1 609 may generate the above-described decoded data. The first decoded data may be delivered to the RDOUT 610 .

RDOUT 610 may obtain first decrypted data from TDEC0 608 and/or TDEC1 609, and RDOUT 610 may obtain first decoded data from TDEC0 608 and/or TDEC1 609 can output The RDOUT 610 may output a CRC calculation result using the above-described first decoded data. RDOUT 610 may output '0' as a CRC calculation result when the CRC value of the above-described first data matches the CRC value included in the above-described first data, and the RDOUT 610 may output the above-described first data. 1 When the CRC calculation result of data does not match the CRC included in the above-described first data, '1' may be output as a CRC check result.

As a decoding operation for the first data, after MOVE 605 transfers the third LLR value to HBUF 601 (S604), HREAD 602 performs HARQ feedback operation on first data. Again, the third LLR value stored in HBUF 601 may be transferred to TBUF0 603 and/or TBUF1 604. In addition, TBUF0 (603) and/or TBUF1 (604) may transfer the third LLR value to DERM (606). The DERM 606 may obtain a fourth LLR value, which is an LLR value of the first data acquired from the modem demodulator (S601). The DERM 606 may generate a fifth LLR value by combining the above-described third LLR value and the above-described fourth LLR value that is the LLR value of the first data.

The DERM 606 may transmit the above-described fifth LLR value to TBUF0 603 and/or TBUF1 604. TBUF0 (603) and/or TBUF1 (604) may store the above-described fifth LLR value obtained from DERM (606), and TBUF0 (603) and/or TBUF1 (604) may MOVE the above-described fifth LLR value. (605).

MOVE 605 may transfer the above-described fifth LLR value obtained from TBUF0 603 and/or TBUF1 604 to HBUF 601, and MOVE 605 may transmit the above-described fifth LLR value to DEINT 607 ) can be passed on. The HBUF 601 may store the above-described fifth LLR value in memory. The fifth LLR value stored in the HBUF 601 may be updated to be the same as the fifth LLR value transmitted to the DEINT 607.

DEINT 607 may perform the above-described deinterleaving of the first data based on the above-described fifth LLR value, and DEINT 607 converts the value after performing the above-described deinterleaved first data to TDEC0 (608). ) and/or TDEC1 (609). TDEC0 608 and/or TDEC1 609 may generate first decoded data by decoding the above-described interleaved first data according to a turbo decoder algorithm, and TDEC0 608 and/or TDEC1 ( 609) may transfer the above-described first decoded data to the RDOUT 610. RDOUT (610) can obtain the above-described first decoded data from TDEC0 (608) and / or TDEC1 (609), RDOUT (610) can output the above-described first decoded data, RDOUT (610) may output the CRC calculation result of the above-described first data.

When the communication node 600 performing the decryption operation in the communication system receives the initial transmission data and / or retransmission data of the first data in the HARQ process of the communication system, the above-described first data may be decoded. . In addition, the method of performing the decoding operation in the communication system may perform the above-described decoding of the first data when initial transmission data and / or retransmission data of the first data are received in the HARQ process of the communication system.

As an embodiment, when the terminal receives initial transmission data of the first data from the base station, or when the NDI of the first data received by the terminal from the base station is toggled, the terminal sets a value of '0' as the first LLR value. It can be moved to TBUF (603). The communication node 600 performing the decryption operation in the communication system may move the first LLR value stored in the HBUF 601 to the TBUF0 603 through the HREAD 602.

The DERM 606 may obtain a second LLR value, which is an LLR value of the initial transmission data of the first data, from the modem demodulator (S601). The DERM 606 may obtain the second LLR value stored in the TBUF0 603 (S602), and the DERM 606 combines the above-described first LLR value and the above-described second LLR value to obtain a third LLR value. can create DERM 606 may deliver the above-described third LLR value to TBUF0 603. TBUF0 (603) can obtain the above-mentioned third LLR value from DERM (606), and TBUF0 (603) can store the above-mentioned third LLR value (S603).

MOVE 605 may obtain the above-described third LLR value from TBUF0 603, MOVE 605 may transmit the above-described third LLR value to HBUF 601, and MOVE 605 may obtain the above-described third LLR value. The third LLR value may be transferred to DEINT 607. The HBUF 601 may store the above-described third LLR value acquired from the MOVE 605. The third LLR value stored in HBUF 601 may be updated to be the same as the third LLR value transmitted to DEINT 607 .

DEINT 607 may deinterleave the above-described first data based on the above-described third LLR value from MOVE 605, and DEINT 607 may transmit the deinterleaved first data to TDEC0 608. there is. TDEC0 608 may obtain deinterleaved first data from DEINT 607 . The TDEC0 608 may generate first decoded data by decoding the deinterleaved first data according to the turbo decoding algorithm, and the TDEC0 608 may transmit the above-described first decoded data to the RDOUT 610.

The RDOUT 610 may obtain the above-described first decoded data from the TDEC0 608, and the RDOUT 610 may output the above-described first decoded data. The RDOUT 610 may output a CRC calculation result using the above-described first decoded data. The RDOUT 610 may output '0' as a CRC calculation result when the CRC calculation result of the above-described first decoded data matches the CRC value included in the above-described first data. The RDOUT 610 may output '1' as a CRC check result when the CRC calculation result of the above-described first decoded data does not match the CRC included in the above-described first data.

As another embodiment, the terminal receives initial transmission data of the first data from the base station, the terminal receives retransmission data of the first data from the base station, and the initial transmission data of the above-described first data and the above-described first data When the retransmitted data is the same type of data, the communication node 600 performing the decoding operation in the communication system converts the first LLR value of the initial transmission data of the first data stored in the HBUF 601 through the HREAD 602. It can be moved to TBUF0 (603).

The DERM 606 may obtain a second LLR value, which is an LLR value of retransmission data of the first data, from the modem demodulator (S601). The DERM 606 may obtain the second LLR value stored in the TBUF0 603 (S602), and the DERM 606 combines the above-described first LLR value and the above-described second LLR value to obtain a third LLR value. can create DERM 606 may deliver the above-described third LLR value to TBUF0 603. TBUF0 (603) can obtain the above-mentioned third LLR value from DERM (606), and TBUF0 (603) can store the above-mentioned third LLR value (S603).

MOVE 605 may obtain the above-described third LLR value from TBUF0 603, MOVE 605 may transmit the above-described third LLR value to HBUF 601, and MOVE 605 may obtain the above-described third LLR value. The third LLR value may be transferred to DEINT 607. The HBUF 601 may store the above-described third LLR value acquired from the MOVE 605. The third LLR value stored in HBUF 601 may be updated to be the same as the third LLR value transmitted to DEINT 607 .

DEINT 607 may deinterleave the above-described first data based on the above-described third LLR value from MOVE 605, and DEINT 607 may transmit the deinterleaved first data to TDEC0 608. there is. TDEC0 608 may obtain deinterleaved first data from DEINT 607 . The TDEC0 608 may generate first decoded data by decoding the deinterleaved first data according to the turbo decoding algorithm, and the TDEC0 608 may transmit the above-described first decoded data to the RDOUT 610. RDOUT 610 may obtain first decoded data, and RDOUT 610 may output first decoded data.

The RDOUT 610 may obtain the above-described first decoded data from the TDEC0 608, and the RDOUT 610 may output a CRC calculation result using the above-described first decoded data. The RDOUT 610 may output '0' as a CRC calculation result when the CRC calculation result of the above-described first decoded data matches the CRC value included in the above-described first data. The RDOUT 610 may output '1' as a CRC check result when the CRC calculation result of the above-described first decoded data does not match the CRC included in the above-described first data.

In addition, the communication node 600 performing a decoding operation in the communication system receives first data in the HARQ process of the communication system, receives second data in the HARQ process HARQ process of the communication system, and the above-described first data has When the first RV is different from the second RV of the above-described second data, decoding of the above-described first data and/or second data may be performed. In addition, a method of performing a decoding operation in a communication system receives first data in an HARQ process of the communication system, receives second data of the HARQ process of the communication system, and the first RV of the above-described first data is as described above. When the second data is different from the second RV, the above-described first data and/or the above-described second data may be decoded.

As an embodiment, when the terminal receives first data, which is initial transmission data having RV0, from the base station, and the terminal receives second data, which is initial transmission data, having RV2, the terminal determines the LLR value of the first data and The LLR value of the second data may be stored in one of TBUF0 (603) and TBUF1 (604), respectively. In addition, when the terminal receives first data, which is initial transmission data having RV0, from the base station, and the terminal receives second data, which is initial transmission data, having RV2, the terminal receives the above-described first data or the above-described second data. Decryption of data can be performed in one of TDEC0 (608) and TDEC1 (609).

When the terminal receives first data, which is initial transmission data having a first RV, and receives second data, which is initial transmission data, which has a second RV different from the above-described first RV, the communication system performs a decoding operation The communication node 600 may move the first LLR value of the first data stored in the HBUF 601 to the TBUF0 603 through the HREAD 602 . The DERM 606 may obtain a second LLR value, which is an LLR value of the second data, from the modem demodulator (S601).

The DERM 606 may obtain the above-described first LLR value stored in the TBUF0 603 (S602), and the DERM 606 combines the above-described first LLR value and the above-described second LLR value to obtain a third LLR value. value can be created. DERM 606 may deliver the above-described third LLR value to TBUF1 604. TBUF1 (604) can obtain the above-mentioned third LLR value from DERM (606), and TBUF1 (604) can store the above-mentioned third LLR value (S603).

MOVE 605 may obtain the above-described third LLR value from TBUF1 603, MOVE 605 may transmit the above-described third LLR value to HBUF 601, and MOVE 605 may obtain the above-described third LLR value. The third LLR value may be transferred to DEINT 607. The HBUF 601 may store the above-described third LLR value acquired from the MOVE 605. The third LLR value stored in HBUF 601 may be updated to be the same as the third LLR value transmitted to DEINT 607 .

DEINT 607 may deinterleave the above-described second data based on the above-described third LLR value from MOVE 605, and DEINT 607 may transmit the deinterleaved second data to TDEC1 609. there is. TDEC1 (609) may obtain deinterleaved second data from DEINT (607). The TDEC1 609 may generate second decoded data by decoding the deinterleaved second data according to the turbo decoding algorithm, and the TDEC1 60 may transmit the above-described second decoded data to the RDOUT 610.

RDOUT 610 may obtain second decrypted data from TDEC1 609, and RDOUT 610 may output the above-described second decoded data. The RDOUT 610 may output a CRC calculation result using the above-described second decoded data. RDOUT 610 may output '0' as a CRC calculation result when the CRC calculation result of the above-described second decoded data matches the CRC value included in the above-described second data. When the CRC calculation result of one second decoded data does not match the CRC included in the aforementioned second data, '1' may be output as a CRC check result.

In addition, the communication node 600 performing the decoding operation in the communication system receives the first data in the HARQ process of the communication system, receives the second data in the HARQ process HARQ process of the communication system, and of the above-described second data When the NDI is toggled, the above-described first data and/or second data may be decrypted. In addition, a method of performing a decoding operation in a communication system receives first data in the HARQ process of the communication system, receives second data of the HARQ process of the communication system, and when the NDI of the above-described second data is toggled, Decryption of the above-described first data and/or the above-described second data may be performed.

As an embodiment, when the terminal receives second data from the base station and the aforementioned NDI of the second data is toggled, the terminal sets the LLR value of the first data and the LLR value of the second data to TBUF0 (603) and It can be stored in one of TBUF1 (604). In addition, when the terminal receives second data from the base station and the above-described NDI of the second data is toggled, the terminal decodes the above-described first data or the above-described second data through TDEC0 (608) and TDEC1 (609). ) can be performed in one of them.

When the terminal receives the first data and the terminal receives the second data in which NDI is toggled, the communication node 600 performing the decoding operation in the communication system has the second data stored in the HBUF 601 by the HREAD 602. The first LLR value of 1 data can be moved to TBUF0 (603). The DERM 606 may obtain a second LLR value, which is an LLR value of the second data, from the modem demodulator (S601).

The DERM 606 may obtain the first LLR value stored in the TBUF0 603 (S602), and the DERM 606 combines the above-described first LLR value and the above-described second LLR value to obtain a third LLR value. can create DERM 606 may deliver the above-described third LLR value to TBUF1 604. TBUF1 (604) can obtain the above-mentioned third LLR value from DERM (606), and TBUF1 (604) can store the above-mentioned third LLR value (S603).

MOVE 605 may obtain the above-described third LLR value from TBUF1 603, MOVE 605 may transmit the above-described third LLR value to HBUF 601, and MOVE 605 may obtain the above-described third LLR value. The third LLR value may be transferred to DEINT 607. The HBUF 601 may store the above-described third LLR value acquired from the MOVE 605. The third LLR value stored in HBUF 601 may be updated to be the same as the third LLR value transmitted to DEINT 607 .

DEINT 607 may deinterleave the above-described second data based on the above-described third LLR value from MOVE 605, and DEINT 607 may transmit the deinterleaved second data to TDEC1 609. there is. TDEC1 (609) may obtain deinterleaved second data from DEINT (607). The TDEC1 609 may generate second decoded data by decoding the deinterleaved second data according to the turbo decoding algorithm, and the TDEC1 60 may transmit the above-described second decoded data to the RDOUT 610.

RDOUT 610 may obtain second decoded data from TDEC1 609, and RDOUT 610 may output the above-described second decoded data. The RDOUT 610 may output a CRC calculation result using the above-described second decoded data. RDOUT 610 may output '0' as a CRC calculation result when the CRC calculation result of the above-described second decoded data matches the CRC value included in the above-described second data. When the CRC calculation result of one second decoded data does not match the CRC included in the aforementioned second data, '1' may be output as a CRC check result.

In addition, the communication node 600 performing the decoding operation in the communication system receives the initial transmission data of the first data and the retransmission data of the above-described first data in the HARQ process of the communication system, and in the HARQ process of the communication system HARQ process When second data is received, and the first RV of the above-described first data is different from the second RV of the above-described second data or when the NDI of the above-described second data is toggled, the above-described first data and/or decryption of the second data. In addition, a method of performing a decoding operation in a communication system includes receiving initial transmission data of first data and retransmission data of the above-described first data in an HARQ process of the communication system, and receiving second data in the HARQ process of the communication system. When the first RV of the above-described first data is different from the second RV of the above-described second data or when the NDI of the above-described second data is toggled, the above-described first data and/or the above-described second data Decryption of the second data may be performed.

As an embodiment, when the terminal receives initial transmission data and retransmission data of the first data, and the terminal receives second data having an RV different from the aforementioned initial transmission data and RV of the first data or in which NDI is toggled , The communication node 600 performing the decoding operation in the communication system may store the LLR value related to the first data described above in TBUF0 603, and the communication node 600 performing the decoding operation in the communication system may store the LLR value related to the first data described above. 1 Decryption of data can be performed in TDEC0 (608). In addition, the communication node 600 performing the decoding operation in the communication system may store the LLR value related to the second data described above in TBUF1 604, and the communication node 600 performing the decoding operation in the communication system Decryption of one second data may be performed by the TDEC1 (609).

When the decoding operation of the received data of the terminal starts, the communication node 600 performing the decoding operation in the communication system sets the first LLR value of the initial transmission data of the first data stored in the HBUF 601 by the HREAD 602 to TBUF0. (603). The DERM 606 may obtain a second LLR value, which is an LLR value of retransmission data of the first data, from the modem demodulator (S601). The DERM 606 may obtain the second LLR value stored in the TBUF0 603 (S602), and the DERM 606 combines the above-described first LLR value and the above-described second LLR value to obtain a third LLR value. can create DERM 606 may deliver the above-described third LLR value to TBUF0 603. TBUF0 (603) can obtain the above-mentioned third LLR value from DERM (606), and TBUF0 (603) can store the above-mentioned third LLR value (S603).

MOVE 605 may obtain the above-described third LLR value from TBUF0 603, MOVE 605 may transmit the above-described third LLR value to HBUF 601, and MOVE 605 may obtain the above-described third LLR value. The third LLR value may be transferred to DEINT 607. The HBUF 601 may store the above-described third LLR value acquired from the MOVE 605. The third LLR value stored in HBUF 601 may be updated to be the same as the third LLR value transmitted to DEINT 607 .

DEINT 607 may deinterleave the above-described first data based on the above-described third LLR value from MOVE 605, and DEINT 607 may transmit the deinterleaved first data to TDEC0 608. there is. TDEC0 608 may obtain deinterleaved first data from DEINT 607 . The TDEC0 608 may generate first decoded data by decoding the deinterleaved first data according to the turbo decoding algorithm, and the TDEC0 608 may transmit the above-described first decoded data to the RDOUT 610.

RDOUT 610 may obtain first decoded data, and RDOUT 610 may output the above-described first decoded data. The RDOUT 610 may output a CRC calculation result using the above-described first decoded data. The RDOUT 610 may output '0' as a CRC calculation result when the CRC calculation value of the above-described first decoded data matches the CRC value included in the above-described first data. The RDOUT 610 may output '1' as a CRC check result when the CRC calculation result of the above-described first decoded data does not match the CRC included in the above-described first data.

After the MOVE 605 performs an operation (S604) of transmitting the third LLR value to the HBUF 601 as a decoding operation for the first data, it has an RV value different from the above-described first data or the NDI is To decrypt the toggled second data, the HREAD 602 may transfer the third LLR value stored in the HBUF 601 to the TBUF0 603 again. Also, TBUF0 604 may deliver the third LLR value to DERM 606 .

The DERM 606 may obtain a fourth LLR value, which is an LLR value of the second data, from the modem demodulator (S601). The DERM 606 may generate a fifth LLR value by combining the above-described third LLR value and the above-described fourth LLR value. DERM 606 may deliver the above-described fifth LLR value to TBUF1 604. TBUF1 (604) can store the above-described fifth LLR value obtained from DERM (606), and TBUF1 (604) can transmit the above-described fifth LLR value to MOVE (605).

MOVE 605 may obtain the aforementioned fifth LLR value from TBUF1 604 . MOVE 605 may transfer the above-described fifth LLR value to HBUF 601 , and MOVE 605 may transfer the above-described fifth LLR value to DEINT 607 . The HBUF 601 may store the above-described fifth LLR value in memory. The fifth LLR value stored in the HBUF 601 may be updated to be the same as the fifth LLR value transmitted to the DEINT 607.

DEINT 607 may perform the above-described deinterleaving of the second data based on the above-described fifth LLR value, and DEINT 607 may transmit the deinterleaved second data to TDEC1 609. The TDEC1 609 may generate second decoded data by decoding the above-described interleaved second data according to the turbo decoding algorithm, and the TDEC1 609 may transmit the above-described second decoded data to the RDOUT 610 .

The RDOUT 610 may obtain the aforementioned second decoded data, and the RDOUT 610 may output the aforementioned second decoded data. The RDOUT 610 may output a CRC calculation result using the above-described second decoded data. The RDOUT 610 may output '0' as a CRC calculation result when the CRC calculation value of the above-described second decoded data matches the CRC value included in the above-mentioned second data. The RDOUT 610 may output '1' as a CRC check result when the CRC calculation result of the above-described second decoded data does not match the CRC included in the above-described second data.

Methods according to the present application 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 this application 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 as at least one software module to perform the operations of the present application, and vice versa.

Although described with reference to the above embodiments, those skilled in the art will understand that the present application can be variously modified and changed without departing from the spirit and scope of the present application as described in the claims below. You will be able to.

Claims (1)

As a communication node that performs a decryption operation in a communication system,
a first temporary buffer for storing a first LLR value of first initial transmission data having a first redundancy version (RV);
a second temporary buffer;
The first LLR value stored in the first temporary buffer is obtained, and a second LLR value of second initial transmission data having a second RV is obtained from a modem (MODEM) of the communication node, and the first LLR value and a DERM combining the second LLR values to generate a third LLR value and storing the third LLR value in the second temporary buffer;
a de-interleaver that obtains the third LLR value stored in the second temporary buffer and performs de-interleaving of the third LLR value; and
and at least one turbo decoder that obtains the deinterleaved third LLR value from the deinterleaver and performs decoding using the third LLR value.

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