KR20220047167A - Method and apparatus for transmitting and receiving feedback information in communication system - Google Patents

Abstract

Disclosed are a method and a device for transmitting/receiving feedback information in a communication system. According to the present invention, an operation method of a terminal comprises the steps of: receiving, from a base station, a higher layer message including information indicating that a first DCI including an HARQ feedback enable/disable indicator is set; receiving the first DCI from the base station; receiving first downlink data from the base station on the basis of first scheduling information included in the first DCI; and determining whether to transmit a first HARQ response to the first downlink data on the basis of the HARQ feedback enable/disable indicator included in the first DCI. Therefore, the performance of a communication system can be improved.

Description

Method and apparatus for transmitting and receiving feedback information in a communication system

The present invention relates to a technique for transmitting and receiving feedback information in a communication system, and more particularly, to a technique for transmitting feedback information of a terminal for downlink transmission of a base station.

With the development of information and communication technology, various wireless communication technologies are being developed. For processing of rapidly increasing wireless data, a frequency band (eg, a frequency band of 6 GHz or more) higher than a frequency band (eg, a frequency band of 6 GHz or less) of long term evolution (LTE) (or LTE-A) A communication system (eg, a new radio (NR) communication system) using The NR communication system may support a frequency band of 6 GHz or higher as well as a frequency band of 6 GHz or less, and may support various communication services and scenarios compared to the LTE communication system. For example, a usage scenario of the NR communication system may include enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), and the like.

In an NR communication system, a base station may transmit common data (eg, the same data) to a plurality of terminals. A plurality of terminals may receive common data, and may transmit feedback information on the common data to the base station. In this case, methods for each of a plurality of terminals to independently transmit feedback information for common data may be required.

On the other hand, the technology that is the background of the invention is written to improve the understanding of the background of the invention, and may include content that is not already known to those of ordinary skill in the art to which this technology belongs.

An object of the present invention for solving the above problems is to provide a method and apparatus for transmitting and receiving feedback information in a communication system.

In a method of operating a terminal according to a first embodiment of the present invention for achieving the above object, a higher layer message including information indicating that the first DCI including the HARQ feedback enable/disable indicator is configured is transmitted from the base station Receiving, receiving the first DCI from the base station, receiving first downlink data from the base station based on first scheduling information included in the first DCI, and including in the first DCI and determining whether to transmit a first HARQ response to the first downlink data based on the HARQ feedback enable/disable indicator.

When the HARQ feedback enable/disable indicator indicates to enable HARQ feedback, the first HARQ response may be transmitted to the base station, and the HARQ feedback enable/disable indicator indicates that the HARQ feedback is disabled. In the case of indicating , the first HARQ response may not be transmitted to the base station.

The higher layer message or the first DCI may further include information indicating a HARQ feedback scheme, and when the HARQ feedback scheme is an ACK/NACK feedback scheme, the first HARQ response transmitted to the base station is ACK or It may include NACK, and when the HARQ feedback scheme is a NACK-only scheme, the first HARQ response transmitted to the base station may include only NACK.

The method of operating the terminal includes: receiving a second DCI from the base station; receiving second downlink data from the base station based on second scheduling information included in the second DCI; and generating multiplexed HARQ responses by multiplexing a second HARQ response for the second downlink data, and transmitting the multiplexed HARQ responses to the base station through the same slot. The first feedback resource indicated by the first DCI and the second feedback resource indicated by the second DCI may be configured in the same slot.

The multiplexed HARQ responses may be a HARQ codebook, and the arrangement of the multiplexed HARQ responses in the HARQ codebook may be determined according to types of the first downlink data and the second downlink data, respectively.

The method of operating the terminal includes receiving a second DCI from the base station, receiving second downlink data from the base station based on second scheduling information included in the second DCI, and the first DCI When the first feedback resource indicated by and the second feedback resource indicated by the second DCI are configured in the same slot, one having a higher priority among the first downlink data and the second downlink data The method may further include transmitting a HARQ response for downlink data of , to the base station through the same slot.

The priority of each of the first downlink data and the second downlink data may vary according to a type of downlink data, and the type of downlink data may be classified into individual downlink data and common downlink data, , the individual downlink data may be downlink data transmitted to one terminal, and the common downlink data may be downlink data transmitted to a plurality of terminals.

The method of operating the terminal includes receiving a second DCI from the base station, receiving second downlink data from the base station based on second scheduling information included in the second DCI, and the first DCI and at least one HARQ response among the first HARQ response or the second HARQ response to the second downlink data by using a HARQ feedback resource indicated by one DCI received late in the time domain among the second DCIs. The method may further include transmitting to the base station.

The first downlink data may be individual downlink data transmitted to one terminal or common downlink data transmitted to a plurality of terminals, and priority information of the individual downlink data and priority of the common downlink data The ranking information may be included in the higher layer message.

In a method of operating a terminal according to a second embodiment of the present invention for achieving the above object, a first higher layer message including information indicating that DCI including an HARQ feedback enable/disable indicator is not configured Receiving from a base station, receiving a second higher layer message including information indicating whether to transmit HARQ feedback from the base station, receiving a first DCI from the base station, scheduling included in the first DCI Receiving downlink data from the base station based on the information, and determining whether to transmit an HARQ response to the downlink data based on information included in the second higher layer message.

The HARQ response may be transmitted when the second higher layer message indicates transmission of the HARQ feedback, and whether the HARQ response is transmitted when the second higher layer message does not indicate transmission of the HARQ feedback may be determined based on a basic setting of the communication system.

The first higher layer message, the second higher layer message, or the first DCI may further include information indicating a HARQ feedback scheme, and when the HARQ feedback scheme is an ACK/NACK feedback scheme, to the base station The transmitted HARQ response may include ACK or NACK, and when the HARQ feedback scheme is a NACK-only scheme, the HARQ response transmitted to the base station may include only NACK.

When the HARQ feedback scheme of the HARQ response is not indicated by the base station, the HARQ response may be transmitted based on a default HARQ feedback scheme, and the default HARQ feedback scheme is an ACK/NACK feedback scheme or a NACK-only feedback scheme can be

The first DCI may further include a PRI indicating a HARQ feedback resource, and the HARQ response may be transmitted in the HARQ feedback resource indicated by the PRI.

In a method for operating a base station according to a third embodiment of the present invention for achieving the above object, a higher layer message including information indicating that the first DCI including the HARQ feedback enable/disable indicator is set is transmitted. step, transmitting a first DCI including the HARQ feedback enable/disable indicator and first scheduling information to the terminal, and transmitting first downlink data to the terminal based on the first scheduling information; and determining whether to perform a reception operation of a first HARQ response to the first downlink data based on the HARQ feedback enable/disable indicator.

When the HARQ feedback enable/disable indicator indicates to enable HARQ feedback, the reception operation of the first HARQ response may be performed, and the HARQ feedback enable/disable indicator indicates to disable the HARQ feedback. In the case of indicating , the operation of receiving the first HARQ response may not be performed.

The higher layer message or the first DCI may further include information indicating a HARQ feedback scheme, and when the HARQ feedback scheme is an ACK/NACK feedback scheme, the first HARQ response may include ACK or NACK. and, when the HARQ feedback scheme is a NACK-only scheme, the first HARQ response may include only NACK.

The method of operating the base station includes transmitting a second DCI including second scheduling information to the terminal, transmitting second downlink data to the terminal based on the second scheduling information, and the first When the first feedback resource indicated by DCI and the second feedback resource indicated by the second DCI are configured in the same slot, the first HARQ response and the second HARQ response for the second downlink data The method may further include receiving from the terminal in the same slot, and the first HARQ response and the second HARQ response may be multiplexed in the same slot.

The method of operating the base station includes transmitting a second DCI including second scheduling information to the terminal, transmitting second downlink data to the terminal based on the second scheduling information, and the first When the first feedback resource indicated by DCI and the second feedback resource indicated by the second DCI are configured in the same slot, having a higher priority among the first downlink data and the second downlink data The method may further include receiving an HARQ response for one downlink data from the terminal in the same slot.

The first downlink data may be individual downlink data transmitted to one terminal or common downlink data transmitted to a plurality of terminals, and priority information of the individual downlink data and priority of the common downlink data The ranking information may be included in the higher layer message.

According to the present application, the base station can transmit a message indicating whether to transmit hybrid automatic repeat request (HARQ) feedback (eg, an upper layer message, a medium access control (MAC) layer message, and/or a physical layer message). there is. The terminal may determine whether to transmit the HARQ feedback based on the message received from the base station. When transmission of HARQ feedback is indicated, the terminal may transmit HARQ feedback for downlink data to the base station. The above-described operations may be applied to an embodiment in which the base station transmits the same downlink data to a plurality of terminals. In this case, the HARQ feedback procedure may be efficiently performed, and the performance of the communication system may be improved.

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 system frame in a communication system.
4 is a conceptual diagram illustrating a first embodiment of a subframe in a communication system.
5 is a conceptual diagram illustrating a first embodiment of a slot in a communication system.
6 is a conceptual diagram illustrating a first embodiment of a time-frequency resource in a communication system.
7 is a conceptual diagram illustrating a second embodiment of a slot in a communication system.
8 is a flowchart illustrating a first embodiment of a downlink communication method in a communication system.
9 is a conceptual diagram illustrating a first embodiment of a method for transmitting feedback information in a communication system.
10 is a flowchart illustrating a first embodiment of a method for indicating enable/disable of HARQ feedback in a communication system.
11 is a flowchart illustrating a second embodiment of a method for indicating enable/disable of HARQ feedback in a communication system.
12 is a conceptual diagram illustrating a second embodiment of a method for transmitting feedback information in a communication system.

Since the present invention can have various changes and can 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 it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed 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, “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”.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

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

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

A communication system to which embodiments according to the present invention are applied will be described. The communication system to which the embodiments according to the present invention are applied is not limited to the content described below, and the embodiments according to the present invention can be applied to various communication systems. Here, a communication system may be used in the same sense as a communication network (network).

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

1, the base station 110 is a cellular (cellular) communication (eg, long term evolution (LTE) defined in the 3rd generation partnership project (3GPP) standard, LTE-A (advanced), LTE-A Pro , LTE-U (unlicensed), NR (new radio), NR-U (unlicensed), etc. can be supported, etc. The base station 110 is a multiple input multiple output (MIMO) (eg, single user (SU)-MIMO) , MU (multi user)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP), carrier aggregation (CA), etc. can be supported. A downlink channel and/or signal may be transmitted. The first terminal 120 may receive a downlink channel and/or a signal from the base station 110. The first terminal 120 may transmit an uplink to the base station 110. A link channel and/or a signal may be transmitted. The base station 110 may receive an uplink channel and/or a signal from the first terminal 120. The second terminal 130 may communicate with the first terminal 120. Downlink communication and/or uplink communication may be performed with the base station 110 in the same or similar manner.

Communication nodes (ie, base stations, terminals, etc.) constituting the above-described communication system are CDMA (code division multiple access) based communication protocol, WCDMA (wideband CDMA) based communication protocol, TDMA (time division multiple access) based Communication protocol, FDMA (frequency division multiple access) based communication protocol, SC (single carrier)-FDMA based communication protocol, OFDM (orthogonal frequency division multiplexing) based communication protocol, OFDMA (orthogonal frequency division multiple access) based communication Protocols and the like may be supported.

Among the communication nodes, the base station is a NodeB (NodeB), an evolved NodeB (NodeB), 5g NodeB (gNodeB), a base transceiver station (BTS), a radio base station, a radio transceiver, and an access point. (access point), an access node, and may be referred to as a transmission/reception point (Tx/Rx Point). Among communication nodes, a terminal includes a user equipment (UE), an access terminal, a mobile terminal, a station, a subscriber station, a portable subscriber station, and a mobile It may be referred to as a station (mobile station), a node (node), a device (device), and the like. A communication node 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 , the 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 of the components included in the communication node 200 may be connected by a bus 270 to communicate with each other.

However, each of the components included in the communication node 200 may not be connected to the common bus 270 but to the processor 210 through an individual interface or an individual bus. For example, the processor 210 may be connected to at least one of the memory 220 , the transceiver 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 mean 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 be configured as at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

Next, operating methods of a communication node in a communication system will be described. Even when a method (eg, transmission or reception of a signal) performed in a first communication node among communication nodes is described, a corresponding second communication node is a method (eg, a method corresponding to the method performed in the first communication node) For example, reception or transmission of a signal) may be performed. That is, when the operation of the terminal is described, the corresponding base station may perform the operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, the corresponding terminal may perform the operation corresponding to the operation of the base station.

3 is a conceptual diagram illustrating a first embodiment of a system frame in a communication system.

Referring to FIG. 3 , a time resource in a communication system may be divided in units of frames. For example, in the time domain of a communication system, system frames may be established consecutively. The length of the system frame may be 10 ms (millisecond). A system frame number (SFN) may be set to #0 to #1023. In this case, 1024 system frames may be repeated in the time domain of the communication system. For example, the SFN of the system frame after the system frame #1023 may be #0.

One system frame may include two half frames. The length of one half frame may be 5 ms. A half frame positioned in the start region of the system frame may be referred to as “half frame #0”, and a half frame positioned in the end region of the system frame may be referred to as “half frame #1”. The system frame may include 10 subframes. The length of one subframe may be 1 ms. Ten subframes within one system frame may be referred to as “subframes #0-9”.

4 is a conceptual diagram illustrating a first embodiment of a subframe in a communication system.

Referring to FIG. 4 , one subframe may include n slots, and n may be a natural number. Accordingly, one subframe may consist of one or more slots.

5 is a conceptual diagram illustrating a first embodiment of a slot in a communication system.

Referring to FIG. 5 , one slot may include one or more symbols. One slot shown in FIG. 5 may include 14 symbols. The length of the slot may vary according to the number of symbols included in the slot and the length of the symbol. Alternatively, the length of the slot may vary according to numerology. When the subcarrier spacing is 15 kHz (eg, μ=0), the length of the slot may be 1 ms. In this case, one system frame may include 10 slots. When the subcarrier spacing is 30 kHz (eg, μ=1), the length of the slot may be 0.5 ms. In this case, one system frame may include 20 slots.

When the subcarrier spacing is 60 kHz (eg, μ=2), the length of the slot may be 0.25 ms. In this case, one system frame may include 40 slots. When the subcarrier spacing is 120 kHz (eg, μ=3), the length of the slot may be 0.125 ms. In this case, one system frame may include 80 slots. When the subcarrier spacing is 240 kHz (eg, μ=4), the length of the slot may be 0.0625 ms. In this case, one system frame may include 160 slots.

The symbol may be configured as a downlink (DL) symbol, a flexible symbol, or an uplink (UL) symbol. A slot configured only with DL symbols may be referred to as a “DL slot”, a slot configured only with FL symbols may be referred to as a “FL slot”, and a slot configured only with UL symbols may be referred to as a “UL slot”.

The reference signal may be a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation-reference signal (DM-RS), a phase tracking-reference signal (PT-RS), or the like. A channel is a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), etc. can In the following embodiments, the control channel may mean PDCCH, PUCCH, or PSCCH, and the data channel may mean PDSCH, PUSCH, or PSSCH.

6 is a conceptual diagram illustrating a first embodiment of a time-frequency resource in a communication system.

Referring to FIG. 6 , a resource including one symbol (eg, OFDM symbol) in the time domain and one subcarrier in the frequency domain may be defined as a “resource element (RE)”. Resources composed of one OFDM symbol in the time domain and K subcarriers in the frequency domain may be defined as "resource element group (REG)". A REG may include K REs. REG may be used as a basic unit of resource allocation in the frequency domain. K may be a natural number. For example, K may be 12. N may be a natural number. In the slot shown in FIG. 5, N may be 14. N OFDM symbols may be used as a basic unit of resource allocation in the time domain.

Downlink data may be transmitted through a physical downlink shared channel (PDSCH). The base station may transmit configuration information (eg, scheduling information) of the PDSCH to the terminal through a physical downlink control channel (PDCCH). The UE may acquire configuration information of the PDSCH by receiving a PDCCH (eg, downlink control information (DCI)). For example, the configuration information of the PDSCH may include a modulation coding scheme (MCS) used for transmission and reception of the PDSCH, time resource information of the PDSCH, frequency resource information of the PDSCH, feedback resource information of the PDSCH, and the like. The PDSCH may mean a radio resource through which downlink data is transmitted/received. Alternatively, the PDSCH may mean downlink data itself. The PDCCH may mean a radio resource through which downlink control information (eg, DCI) is transmitted and received. Alternatively, the PDCCH may mean downlink control information itself.

7 is a conceptual diagram illustrating a second embodiment of a slot in a communication system.

Referring to FIG. 7 , one slot may include 14 symbols in the time domain. Here, the symbol may be an OFDM symbol. Among the 14 symbols, some symbol(s) may be configured as a PDCCH (eg, a PDCCH resource), and the remaining symbols may be configured as a PDSCH (eg, a PDSCH resource). The PDCCH may be mapped from the start symbol (eg, symbol #0) of the slot. For example, the PDCCH may be mapped to symbols #0 and #1. The PDSCH may be mapped from a symbol (eg, symbol #2) after the end symbol (eg, symbol #1) of the PDCCH. For example, the PDSCH may be mapped to symbols #2 to #13. The above-described mapping method may be referred to as "PDSCH mapping type A". That is, when PDSCH mapping type A is used, the PDCCH may be mapped from the start symbol of the slot, and the PDSCH may be mapped from the symbol after the end symbol of the PDCCH. In this case, the length of the PDSCH in the time domain may be 4, 5, 6, 7, 8, 9, 10, 11, 12, or 13 symbols.

The base station may configure a bandwidth part (BWP) for downlink communication. BWP may be set differently for each terminal. The base station may inform the terminal of the configuration information of the BWP using higher layer signaling. Upper layer signaling may mean "transmission operation of system information" and/or "transmission operation of a radio resource control (RRC) message". The number of BWPs configured for one terminal may be one or more. The terminal may receive the configuration information of the BWP from the base station, and may check the BWP(s) set by the base station based on the configuration information of the BWP. When a plurality of BWPs are configured for downlink communication, the base station may activate one or more BWPs among the plurality of BWPs. The base station may transmit configuration information of the activated BWP(s) to the terminal using at least one of higher layer signaling, medium access control (MAC) control element (CE), or DCI. The base station may perform downlink communication using the activated BWP(s). The terminal may check the activated BWP(s) by receiving configuration information of the activated BWP(s) from the base station, and may perform a downlink reception operation in the activated BWP(s).

8 is a flowchart illustrating a first embodiment of a downlink communication method in a communication system.

Referring to FIG. 8 , a communication system may include a base station and a terminal. The base station may be the base station 110 illustrated in FIG. 1 , and the terminal may be the first terminal 120 or the second terminal 130 illustrated in FIG. 1 . Each of the base station and the terminal may be configured the same or similar to the communication node 200 shown in FIG. 2 .

The base station may generate configuration information (hereinafter, referred to as “periodic DL configuration information”) for periodic downlink communication (S801). Periodic downlink communication may be performed based on a semi-persistent scheduling (SPS) scheme, a configured scheduling (CS) scheme, or a configured grant (CG) scheme. The periodic downlink communication shown in FIG. 8 may be "periodic downlink communication between one base station and one terminal" or "periodic downlink communication between one base station and a plurality of terminals". Hereinafter, “operations of a terminal” may be interpreted as “operations of a plurality of terminals”. The periodic DL configuration information may include one or more information elements among information elements (IEs) listed in Table 1 below.

The base station may transmit a higher layer message (eg, system information and/or RRC message) including periodic DL configuration information to the terminal (S802). In S802, the base station may transmit a higher layer message to a plurality of terminals. Here, the upper layer message is a cell-common (cell-common) RRC message (eg, a cell-specific RRC message), a BWP-common RRC message, and/or a UE group-common (UE group-common) It may be an RRC message. The configuration information included in the terminal group-common RRC message may be information commonly applied to terminals belonging to a specific terminal group (or a specific terminal set). The UE may receive a higher layer message (eg, system information and/or RRC message) from the base station, and periodic DL configuration information (eg, information elements defined in Table 1) included in the higher layer message) can be checked, and periodic downlink communication can be set based on the periodic DL configuration information.

Periodic downlink communication may be activated (eg, triggered) by an activation message (eg, DCI). The base station may generate an activation message to activate periodic downlink communication, and may transmit the activation message to the terminal (S803). The activation message may be DCI (eg, activation DCI). A combination of one or more fields included in DCI may indicate activation of periodic downlink communication. In addition, when a plurality of periodic downlink communications are configured by the base station, a combination of one or more fields included in DCI may indicate one periodic downlink communication to be activated among a plurality of periodic downlink communications.

DCI may be transmitted through a PDCCH, and a cyclic redundancy check (CRC) of DCI may be scrambled by a radio network temporary identifier (RNTI) for periodic downlink communication. The base station may transmit DCI using a common RNTI to transmit an activation message to a plurality of terminals. For example, the base station may transmit DCI using group-configured scheduling-RNTI (G-CS-RNTI) to activate periodic downlink communication for one or more terminals. When periodic downlink communication for one or more terminals is activated, the same downlink data may be transmitted to one or more terminals. The DCI scrambled by the G-CS-RNTI may be a common DCI. The G-CS-RNTI may be configured by the base station, and the base station may transmit configuration information of the G-CS-RNTI to the terminal. The configuration information of the G-CS-RNTI may be transmitted to the terminal through a separate procedure before S802 or S801.

The terminal may perform a reception operation of an activation message (eg, DCI). For example, the UE may receive DCI using G-CS-RNTI, and may check that periodic downlink communication configured by the base station is activated based on a combination of one or more fields included in DCI. In this case, the terminal may activate periodic downlink communication (S804). Here, the terminal may periodically receive the common DCI. In addition, the terminal receiving the activation message (eg, common DCI) may be a terminal capable of receiving the common PDSCH (eg, common data). The common PDSCH may be downlink data transmitted periodically. In addition, the common PDSCH may be the same downlink data transmitted to a plurality of terminals.

When decoding of the activation message is successful, the terminal may transmit an acknowledgment (ACK) for the activation message to the base station. When decoding of the activation message fails, the terminal may transmit a negative ACK (NACK) for the activation message to the base station. After transmitting the activation message, the base station may perform a reception operation of HARQ-ACK for the activation message. In embodiments, HARQ-ACK, HARQ response, HARQ feedback, and feedback information may be used with the same meaning. If the ACK for the activation message is not received, the base station may retransmit the activation message. "When the ACK for the activation message is not received" may be "when a NACK for the activation message is received" and/or "when the HARQ-ACK for the activation message is not received within a preset period". That is, the base station may consider "a case in which the HARQ-ACK for the activation message is not received within a preset period" as "a case where a NACK for the activation message is received". The activation message may be retransmitted through a common PDCCH or a UE-specific PDCCH. For example, the activation message may be retransmitted to "all terminals participating in periodic downlink communication" or "terminal(s) that have transmitted a NACK for the activation message". Alternatively, in the step of retransmitting the activation message, the base station may transmit a MAC message (eg, MAC CE) including information indicating activation of periodic downlink communication to the terminal.

If the activation message is not successfully received, the terminal may perform the operation of receiving the activation message again. For example, the UE may receive the retransmitted activation message by performing a monitoring operation for the common PDCCH and/or the UE-specific PDCCH. As another method, the terminal may receive a MAC message (eg, MAC CE) including information indicating activation of periodic downlink communication from the base station.

The activation message transmitted in S803 may include scheduling information (eg, scheduling information for periodic downlink communication). For example, the base station may transmit a higher layer message including some scheduling information (eg, information elements defined in Table 1) for periodic downlink communication in S802, and in S803 for periodic downlink communication An activation message including the remaining scheduling information (eg, time domain resource assignment (TDRA), frequency domain resource assignment (FDRA), MCS, etc.) may be transmitted. The terminal may check some scheduling information for periodic downlink communication by receiving the higher layer message from the base station, and may check the remaining scheduling information for periodic downlink communication by receiving the activation message from the base station.

After transmitting the activation message, the base station may periodically transmit downlink data (S805). Downlink data may be transmitted through a time period indicated by a higher layer message and a resource indicated by an activation message. The downlink data may be common downlink data (eg, common PDSCH) for a plurality of terminals. When periodic downlink communication is activated (eg, when an activation message is received), the UE may perform a downlink data reception operation in S805. The terminal may transmit the HARQ-ACK to the base station based on a reception result (eg, a decoding result) of downlink data. The HARQ-ACK transmission operation may be performed according to at least one of the embodiment shown in FIG. 9 , the embodiment shown in FIG. 10 , the embodiment shown in FIG. 11 , or the embodiment shown in FIG. 12 . there is.

The base station may generate a deactivation message to deactivate periodic downlink communication. The base station may transmit a deactivation message (S806). The deactivation message may be a DCI (eg, deactivation DCI), and the CRC of the DCI may be scrambled by a common RNTI (eg, G-CS-RNTI). The DCI scrambled by the common RNTI may be a common DCI. DCI indicating deactivation of periodic downlink communication may be transmitted to one or more terminals using a common RNTI. A combination of one or more fields included in DCI may indicate deactivation of periodic downlink communication. In addition, when a plurality of periodic downlink communications are configured, a combination of one or more fields included in DCI may indicate one periodic downlink communication to be deactivated among a plurality of periodic downlink communications.

The terminal may perform a reception operation of a deactivation message (eg, DCI). For example, the UE may receive DCI using G-CS-RNTI, and may confirm that periodic downlink communication configured by the base station is deactivated based on a combination of one or more fields included in DCI. In this case, the terminal may deactivate the periodic downlink communication (S807). Here, the terminal may periodically receive the common DCI. In addition, the terminal receiving the deactivation message (eg, common DCI) may be a terminal capable of receiving the common PDSCH (eg, common data). The common PDSCH may be downlink data transmitted periodically. In addition, the common PDSCH may be the same downlink data transmitted to a plurality of terminals.

After transmission of the deactivation message, the base station may stop periodic downlink communication deactivated by the deactivation message. In addition, the terminal may stop periodic downlink communication deactivated by the deactivation message received from the base station.

9 is a conceptual diagram illustrating a first embodiment of a method for transmitting feedback information in a communication system.

Referring to FIG. 9 , the base station may transmit a control channel (eg, PDCCH) and a data channel (eg, PDSCH) scheduled by a PDCCH (eg, DCI) to the terminal in slot #n. The UE may acquire DCI by performing a PDCCH monitoring operation. DCI may include information (eg, scheduling information) necessary for reception of the PDSCH. The UE may acquire time and frequency resource information, MCS information, etc. of a PDSCH (eg, PDSCH of slot #n) by receiving the PDCCH in slot #n. In the embodiments below, the PDCCH (eg, DCI) of slot #n may mean a PDCCH (eg, DCI) transmitted or received in slot #n, and the PDSCH of slot #n is in slot #n. It may mean a transmitted or received PDSCH. n may be an integer greater than or equal to 0.

In addition, by receiving the DCI in slot #n, the UE may acquire configuration information for transmission of an HARQ response for a PDSCH scheduled by the corresponding DCI. The configuration information for HARQ response transmission may include time and/or frequency resource information used for HARQ response transmission. For example, the UE may determine that the HARQ response for the PDSCH scheduled by the DCI of the slot #n (eg, the PDSCH of the slot #n) is transmitted through the PUCCH or the PUSCH of the slot #n+3. .

The DCI may include information (eg, a time offset) indicating a time from the reception time of the DCI (or the PDSCH scheduled by the DCI) to the transmission time of the HARQ response. For example, the time between the reception time of the DCI (or PDSCH) and the transmission time of the HARQ response may be expressed in units of symbols, slots, or subframes. The time between the reception time of the DCI (or PDSCH) and the transmission time of the HARQ response may be indicated by the "PDSCH-to-HARQ_feedback timing indicator" field included in the DCI. Therefore, the UE may check the transmission time of the HARQ response for the PDSCH based on the "PDSCH-to-HARQ_feedback timing indicator" field included in the DCI.

The base station may transmit DCI and PDSCH to the terminal in each of slots #n to #n+2. The HARQ response for the PDSCH transmitted in slots #n to #n+2 may be configured to be transmitted in PUCCH or PUSCH of slot #n+3. In this case, the "PDSCH-to-HARQ_feedback timing indicator" field included in DCI of slot #n may be set to 3. The "PDSCH-to-HARQ_feedback timing indicator" field included in DCI of slot #n+1 may be set to 2. The "PDSCH-to-HARQ_feedback timing indicator" field included in DCI of slot #n+2 may be set to 1. The terminal is a slot (s) corresponding to the value indicated in the "PDSCH-to-HARQ_feedback timing indicator" field included in DCI (eg, scheduling DCI) from the slot in which the PDSCH is received (or from the slot in which the DCI is received) ) may transmit a HARQ response for the corresponding PDSCH in a later slot. In the following embodiments, "scheduling DCI" may refer to DCI used to schedule PDSCH transmission or PUSCH transmission.

The base station may indicate (or set) a resource through which the terminal receiving downlink data will transmit feedback (eg, HARQ response). For example, the base station may indicate (or configure) a resource to which a HARQ response (eg, ACK or NACK) for downlink data will be transmitted to the terminal. A resource to which the HARQ response is to be transmitted may be referred to as a "feedback resource". The configuration information of the feedback resource may include one or more information elements defined in Table 2 below.

The base station may transmit configuration information of the feedback resource to the terminal. The terminal may receive configuration information of the feedback resource from the base station, check the feedback resource based on the configuration information, and transmit feedback (eg, HARQ response) for downlink data to the base station using the feedback resource. can

For example, the base station is a higher layer message (eg, common RRC message, dedicated RRC message, cell-specific RRC message, UE-specific RRC message), MAC CE, or DCI (eg, DCI 1_x) , common DCI, DCI 2_x), may be used to transmit configuration information of the feedback resource using at least one. Here, x may be an integer greater than or equal to 0.

Alternatively, the feedback resource may be indicated by a combination of an RRC message and DCI. For example, the base station may transmit an RRC message including configuration information of the feedback resource table, and the terminal may check the feedback resource table indicated by the RRC message. In the feedback resource table, each index may indicate time resource information, frequency resource information, frequency hopping information, and/or sequence information of a feedback resource. The base station may transmit DCI including one index in the feedback resource table. The terminal may check the index included in the DCI received from the base station, and check the time resource information, frequency resource information, frequency hopping information, and/or sequence information indicated by the index in the feedback resource table, and check A feedback resource may be determined based on the obtained information.

Meanwhile, the base station may perform downlink communication with one or more terminals. In this case, the base station may schedule the same PDSCH (eg, common PDSCH) for one or more terminals. For example, the base station may schedule the same PDSCH for one or more terminals using a terminal-specific PDCCH (eg, terminal-specific DCI). The UE-specific PDCCH may be a PDCCH transmitted through a UE-specific search space (or UE-specific search space set). The UE-specific PDCCH may be scrambled by the UE-specific RNTI. The UE-specific PDCCH may mean DCI including information element(s) applied to the specific- UE. The base station may perform scheduling for the same PDSCH by using different RNTIs for “different terminals” or “terminals having different RNTIs”. Different RNTIs may be used for scrambling of DCI scheduling the same PDSCH.

The UE may receive the UE-specific PDCCH by performing a monitoring operation in the UE-specific search space (or UE-specific search space set). The UE-specific PDCCH may be received using a UE-specific RNTI. The UE may receive a PDSCH (eg, a common PDSCH) based on the information element(s) included in the UE-specific PDCCH.

Alternatively, the base station may schedule the same PDSCH for one or more terminals using a group common PDCCH. The group common PDCCH may be transmitted through a common search space (or a common search space set). The group common PDCCH may be scrambled using a common RNTI, and the common RNTI may be used in a plurality of terminals. The group common PDCCH may be a DCI including information element(s) commonly applied to a plurality of terminals. The base station may schedule PDSCHs for different terminals using the same RNTI (eg, a common RNTI).

The UE may receive the group common PDCCH by performing a monitoring operation in a common search space (or a common search space set). The group common PDCCH may be received using a common RNTI. The UE may receive a PDSCH (eg, a common PDSCH) based on the information element(s) included in the group common PDCCH.

When scheduling the same PDSCH for one or more terminals, the base station may instruct (or set) the scheduling method to the terminal using a higher layer message (eg, an RRC message). Information indicating the scheduling method may be included in RRC configuration information. For example, the RRC configuration information may indicate "that the same PDSCH is scheduled to one or more terminals through a group common PDCCH". The terminal may check the scheduling method by receiving a higher layer message (eg, RRC configuration information) from the base station. For example, the terminal may confirm "that the same PDSCH is scheduled to one or more terminals through the group common PDCCH".

The base station may configure an RNTI (hereinafter referred to as "MB-RNTI") for scheduling the same PDSCH to one or more terminals. The base station may transmit configuration information of the MB-RNTI to one or more terminals, and the one or more terminals may check the MB-RNTI configured by the base station. That is, MB-RNTI may be configured in one or more terminals. The base station may schedule the same PDSCH for one or more terminals using MB-RNTI. That is, DCI including scheduling information of the same PDSCH may be scrambled by MB-RNTI. The UE may receive DCI from the base station using MB-RNTI, and may receive the same PDSCH based on scheduling information included in DCI.

When PDSCH transmission (eg, the same PDSCH transmission) is scheduled by DCI having MB-RNTI, the feedback procedure of the HARQ response for the corresponding PDSCH may be performed using the feedback resource of each UE. In this case, a higher layer message (eg, RRC configuration information) including configuration information of a feedback resource may be transmitted from the base station to the terminal.

Alternatively, when PDSCH transmission (eg, the same PDSCH transmission) is scheduled by DCI having MB-RNTI, the feedback procedure of HARQ response for the corresponding PDSCH is performed using a common feedback resource associated with MB-RNTI. can be In this case, a higher layer message (eg, RRC configuration information) including configuration information of a common feedback resource may be transmitted from the base station to the terminal.

When the base station schedules the same PDSCH to one or more terminals, the feedback procedure of the HARQ response for the PDSCH may be performed as follows.

The base station may schedule the same PDSCH to one or more terminals. In order to schedule the same PDSCH to one or more terminals, the base station may use a group common PDCCH or a terminal-specific PDCCH. The UE(s) may obtain scheduling information by receiving the group common PDCCH or UE-specific PDCCH from the base station, and may receive the same PDSCH based on the scheduling information.

When the same PDSCH is scheduled for one or more terminals, the base station may indicate to the terminal(s) the feedback of the HARQ response for the corresponding PDSCH.

When the same PDSCH is scheduled for one or more terminals, the base station indicates to the terminal "that the terminal does not transmit the HARQ response when the reception result (eg, the decoding result) for the corresponding PDSCH is ACK" can When the same PDSCH is scheduled for one or more terminals, the base station instructs the corresponding terminal "that the terminal transmits the HARQ response when the reception result (eg, the decoding result) for the corresponding PDSCH is only NACK" can That is, the base station may inform the terminal "that the NACK-only feedback scheme is used". "Information indicating that the NACK-only feedback scheme is used" may be transmitted from the base station to the terminal through a higher layer message (eg, RRC configuration information and/or PUCCH configuration information).

The UE may confirm that the NACK-only feedback scheme is used based on information included in a higher layer message (eg, RRC configuration information and/or PUCCH configuration information) received from the base station. Accordingly, the UE may not transmit HARQ feedback (eg, HARQ-ACK, HARQ response) when the PDSCH reception result is ACK, and may transmit HARQ feedback when the PDSCH reception result is NACK.

On the other hand, when the "ACK/NACK feedback scheme" is used, the UE may transmit an ACK for the corresponding PDSCH when the PDSCH is successfully received, and may transmit a NACK for the corresponding PDSCH when the reception of the PDSCH fails. .

The base station is an uplink message indicating whether DCI (eg, scheduling DCI) indicating enable or disable of HARQ feedback for downlink transmission is configured (eg, RRC configuration information) ) can be transmitted. DCI including information indicating enable or disable of HARQ feedback (hereinafter referred to as "HARQ feedback enabled/disabled indicator") by receiving a higher layer message from the base station. You can check whether the setting of “DCI including HARQ feedback enable/disable indicator is configured” may mean “transmission of DCI including HARQ feedback enable/disable indicator is enabled”. "The DCI including the HARQ feedback enable/disable indicator is not configured" may mean "the transmission of the DCI including the HARQ feedback enable/disable indicator is disabled".

If the DCI including the HARQ feedback enable/disable indicator is not configured, the DCI including the HARQ feedback enable/disable indicator may not be transmitted. In this case, enabling or disabling of HARQ feedback for downlink transmission may be indicated by a higher layer message (eg, RRC configuration information).

The DCI including the HARQ feedback enable/disable indicator may be configured by the base station. In this case, the base station may transmit a DCI including the HARQ feedback enable/disable indicator to the terminal. The corresponding DCI may include scheduling information of the PDSCH associated with the HARQ feedback enable/disable indicator. When the HARQ feedback enable/disable indicator indicates to enable HARQ feedback, HARQ feedback may be transmitted. When the HARQ feedback enable/disable indicator indicates disabling of HARQ feedback, HARQ feedback may not be transmitted. The DCI including the HARQ feedback enable/disable indicator may be a group common DCI.

When the HARQ feedback enable/disable indicator indicates to enable HARQ feedback, the UE may transmit the HARQ feedback after a preset period from the reception time of the DCI including the HARQ feedback enable/disable indicator. The preset period may be X slots. X may be an integer greater than or equal to 0. Information of the preset section may be included in DCI together with the HARQ feedback enable/disable indicator. When the HARQ feedback enable/disable indicator indicates disabling of the HARQ feedback, the UE does not perform the HARQ feedback transmission operation after a preset period from the reception time of the DCI including the HARQ feedback enable/disable indicator. can The preset period may be X slots. X may be an integer greater than or equal to 0.

DCI including the HARQ feedback enable/disable indicator may not be configured by a higher layer message (eg, RRC configuration information). The UE may confirm that DCI including the HARQ feedback enable/disable indicator is not configured by receiving the higher layer message. That is, the UE may determine that the DCI does not include the HARQ feedback enable/disable indicator. In this case, the UE may not transmit HARQ feedback for downlink data. Here, downlink data to which HARQ feedback is not transmitted may be limited to common downlink data (eg, the same PDSCH) for one or more terminals.

"When a higher layer message indicating whether DCI including the HARQ feedback enable/disable indicator is configured (eg, RRC configuration information) is not received from the base station" or "HARQ feedback enable/disable indicator If DCI including DCI is not configured", the terminal may determine whether to transmit HARQ feedback as indicated by a higher layer message (eg, RRC configuration information). The terminal may receive a higher layer message (eg, RRC configuration information) indicating whether to transmit the HARQ feedback from the base station, and may determine whether to transmit the HARQ feedback based on the received higher layer message.

10 is a flowchart illustrating a first embodiment of a method for indicating enable/disable of HARQ feedback in a communication system.

Referring to FIG. 10 , a communication system may include a base station and a terminal. The base station may be the base station 110 illustrated in FIG. 1 , and the terminal may be the first terminal 120 or the second terminal 130 illustrated in FIG. 1 . Each of the base station and the terminal may be configured the same or similar to the communication node 200 shown in FIG. 2 .

In S1001, the terminal may receive a higher layer message (eg, RRC configuration information) from the base station, based on the information included in the higher layer message, whether DCI including the HARQ feedback enable / disable indicator is set can be checked. When the DCI including the HARQ feedback enable/disable indicator is configured, the UE may determine whether to transmit the HARQ feedback based on the HARQ feedback enable/disable indicator included in the DCI (S1002).

If the DCI including the HARQ feedback enable/disable indicator is not configured, the UE may determine whether to transmit the HARQ feedback as indicated by the higher layer message. In S1003, the terminal may determine whether a higher layer message (eg, RRC configuration information) received from the base station includes information indicating whether to transmit HARQ feedback. The upper layer message in S1003 may be the same as the upper layer message in S1001. Alternatively, the upper layer message in S1003 may be different from the higher layer message in S1001. When the higher layer message indicates whether to transmit the HARQ feedback, the terminal may determine whether to transmit the HARQ feedback based on information included in the higher layer message (S1004). When the higher layer message does not indicate whether to transmit the HARQ feedback, the terminal may determine whether to transmit the HARQ feedback based on the basic setting of the communication system (S1005). When whether or not to transmit HARQ feedback is not indicated by a higher layer message, the default setting of the communication system may be “transmitting HARQ feedback” or “not transmitting HARQ feedback”.

11 is a flowchart illustrating a second embodiment of a method for indicating enable/disable of HARQ feedback in a communication system.

Referring to FIG. 11 , a communication system may include a base station and a terminal. The base station may be the base station 110 illustrated in FIG. 1 , and the terminal may be the first terminal 120 or the second terminal 130 illustrated in FIG. 1 . Each of the base station and the terminal may be configured the same or similar to the communication node 200 shown in FIG. 2 .

In S1101, the terminal may receive a higher layer message (eg, RRC configuration information) from the base station, and may check whether the HARQ feedback transmission scheme is set based on information included in the higher layer message. When the transmission method of the HARQ feedback of the terminal is set by the higher layer message, the terminal may determine the HARQ feedback transmission method based on the higher layer message (S1102). When the HARQ feedback transmission method of the terminal is not set by the higher layer message, the terminal may determine the HARQ feedback transmission method based on the basic setting of the communication system (S1103). The basic setting of the communication system may be “ACK/NACK feedback scheme”, “that a NACK-only feedback scheme is used” or “do not transmit HARQ feedback”.

In S1104, the UE may receive a higher layer message from the base station, and may check whether DCI including the HARQ feedback enable/disable indicator is set based on information included in the higher layer message. When the DCI including the HARQ feedback enable/disable indicator is configured, the UE may determine whether to transmit the HARQ feedback based on the HARQ feedback enable/disable indicator included in the DCI (S1105). The upper layer message in S1104 may be the same as the upper layer message in S1101. Alternatively, the upper layer message in S1104 may be different from the higher layer message in S1101.

If the DCI including the HARQ feedback enable/disable indicator is not configured, the UE may determine whether to transmit the HARQ feedback as indicated by the higher layer message. The UE may determine whether to transmit the HARQ feedback based on the higher layer message (S1106). The higher layer message in S1106 may be the same as the higher layer message in S1101. Alternatively, the higher layer message in S1106 may be different from the higher layer message in S1101.

When it is determined to transmit the HARQ feedback by the above-described operations, the UE may transmit the HARQ feedback for the PDSCH (eg, downlink data) to the base station. When it is determined not to transmit HARQ feedback, the UE may not transmit HARQ feedback for the PDSCH (eg, downlink data) to the base station. The above-described operations may be applied to a transmission procedure of HARQ feedback for common downlink data for one or more terminals.

Meanwhile, the base station may indicate to the terminal whether to transmit the HARQ feedback using a higher layer message, a MAC layer message (eg, MAC CE), and/or a physical layer message (eg, DCI).

When transmission of HARQ feedback is indicated by a higher layer message, the UE may transmit HARQ feedback for downlink transmission. In this case, the HARQ feedback may be limited to HARQ feedback for common downlink transmission for one or more terminals. "When transmission of HARQ feedback is configured by a higher layer message and transmission of HARQ feedback is instructed by a physical layer message or MAC layer message", the UE may transmit a HARQ response to downlink transmission. When "transmission of HARQ feedback is configured by a higher layer message and transmission of HARQ feedback is not indicated by a physical layer message or a MAC layer message", the UE may not transmit a HARQ response for downlink transmission.

The base station may indicate (or configure) whether to transmit the HARQ feedback to the terminal using a higher layer message (eg, RRC configuration information). In addition, the base station uses a physical layer message (eg, DCI) or a MAC layer message (eg, MAC CE) HARQ feedback scheme (eg, ACK / NACK feedback scheme or NACK-only feedback scheme) It may instruct (or set) the terminal.

When "transmission of HARQ feedback is indicated by a higher layer message and the HARQ feedback method is indicated by a physical layer message or a MAC layer message", the terminal sends HARQ feedback to the base station based on the HARQ feedback method indicated by the base station can be transmitted If "transmission of the HARQ feedback is not indicated by the higher layer message and the HARQ feedback method is indicated by the physical layer message or the MAC layer message", the terminal may not transmit the HARQ feedback.

Alternatively, the base station instructs (or, configures) the HARQ feedback scheme (eg, ACK/NACK feedback scheme or NACK-only feedback scheme) to the terminal using a higher layer message (eg, RRC configuration information). can do. In addition, the base station may instruct (or set) whether to transmit the HARQ feedback to the terminal using a physical layer message (eg, DCI) or a MAC layer message (eg, MAC CE).

"When the HARQ feedback method is indicated by the higher layer message and the transmission of the HARQ feedback is indicated by the physical layer message or the MAC layer message", the terminal uses the HARQ feedback method indicated by the base station (eg, ACK / NACK HARQ feedback may be transmitted according to a feedback scheme or a NACK-only feedback scheme). If "the HARQ feedback method is indicated by the higher layer message and the transmission of the HARQ feedback is not indicated by the physical layer message or the MAC layer message", the UE may not transmit the HARQ feedback.

The base station may instruct (or configure) the HARQ feedback scheme to the terminal using a higher layer message (eg, RRC configuration information). Here, the HARQ feedback scheme may be an “ACK/NACK feedback scheme”, a “NACK-only feedback scheme”, or a “no ACK/NACK feedback scheme”. When the no ACK/NACK feedback scheme is used, HARQ feedback (eg, ACK or NACK) may not be transmitted.

When the HARQ feedback scheme is indicated by the higher layer message, the UE is based on the HARQ feedback scheme (eg, ACK/NACK feedback scheme, NACK-only feedback scheme, or no ACK/NACK feedback scheme) indicated by the base station. Thus, the HARQ feedback procedure can be performed. When the no ACK/NACK feedback scheme is indicated, HARQ feedback may not be transmitted in the HARQ feedback procedure.

When the base station does not indicate a separate HARQ feedback method to the terminal, the terminal may transmit the HARQ feedback based on the ACK/NACK feedback method. In this case, the default HARQ feedback scheme may be an ACK/NACK feedback scheme. Alternatively, when the base station does not indicate a separate HARQ feedback method to the terminal, the terminal may transmit the HARQ feedback based on the NACK-only feedback method. In this case, the default HARQ feedback scheme may be a NACK-only feedback scheme. Alternatively, when the base station does not indicate a separate HARQ feedback method to the terminal, the terminal may use the no ACK/NACK feedback method. In this case, the default HARQ feedback scheme may be a no ACK/NACK feedback scheme.

When the DCI including the scheduling information of the PDSCH is received using MB-RNTI, the UE may not transmit HARQ feedback (ie, ACK) for the PDSCH when the reception result of the PDSCH is ACK. When the reception result is NACK, HARQ feedback (ie, NACK) for the corresponding PDSCH may be transmitted. That is, in a PDSCH transmission procedure according to DCI having MB-RNTI, a NACK-only feedback scheme may be used.

When a group common PDCCH (eg, group common DCI) including scheduling information of a PDSCH is received, the UE does not transmit HARQ feedback (ie, ACK) for the PDSCH when the PDSCH reception result is ACK. and, when the PDSCH reception result is NACK, HARQ feedback (ie, NACK) for the corresponding PDSCH may be transmitted. That is, in the transmission procedure of the PDSCH according to the group common PDCCH, a NACK-only feedback scheme may be used.

The base station may transmit DCI scrambled by the terminal-specific RNTI to one terminal. The UE may receive the DCI using the UE-specific RNTI, and may receive the PDSCH based on scheduling information included in the DCI. Here, the PDSCH may be scrambled by a UE-specific RNTI. The above-described transmission method may be referred to as a “point to point (PTP) transmission method”.

The base station may transmit the DCI scrambled by the group common RNTI to one or more terminals. The terminal(s) may receive the DCI using the group common RNTI, and may receive the PDSCH based on scheduling information included in the DCI. Here, the PDSCH may be scrambled by a group common RNTI. The above-described transmission scheme may be referred to as a “first point to multipoint (PTM) transmission scheme”.

The base station may transmit the DCI scrambled by the terminal-specific RNTI to the terminal(s). The UE(s) may receive DCI using UE-specific RNTI, and may receive PDSCH based on scheduling information included in DCI. Here, the PDSCH may be scrambled by a group common RNTI. The above-described transmission scheme may be referred to as a “second PTM transmission scheme”.

The base station may perform downlink communication with one or more terminals based on the first PTM transmission scheme. One or more terminals may receive downlink data from the base station based on the first PTM transmission scheme. The terminal may inform the base station of a reception result (eg, HARQ feedback) for downlink data received according to the first PTM transmission scheme. The downlink data retransmission procedure may be performed according to a reception result of the corresponding downlink data. The base station may perform a retransmission procedure for downlink data. A retransmission procedure for data according to the first PTM transmission method may be performed based on the first PTM transmission method. Accordingly, the terminal may receive retransmission data based on the first PTM transmission method.

Alternatively, a retransmission procedure for data according to the first PTM transmission method may be performed based on the second PTM transmission method. When the reception result for downlink data transmitted based on the first PTM transmission method is NACK, the base station may perform a retransmission procedure for the corresponding downlink data based on the second PTM transmission method. Accordingly, the terminal may receive retransmission data based on the second PTM transmission method.

Alternatively, a retransmission procedure for data according to the first PTM transmission method may be performed based on the PTP transmission method. When the reception result for downlink data transmitted based on the first PTM transmission method is NACK, the base station may perform a retransmission procedure for the corresponding downlink data based on the PTP transmission method. Accordingly, the terminal may receive retransmission data based on the PTP transmission method.

The base station may perform a retransmission procedure in the PTP transmission method using the HARQ process ID and New Data Indicator (NDI) for the TB (Transport Block) transmitted in the first PTM transmission method. The base station may perform a retransmission procedure for the first PTM transmission by performing PTP transmission using the same HARQ process ID as the HARQ process ID of the TB transmitted using the first PTM transmission method. The base station may perform a retransmission procedure in the PTP transmission method by using "NDI that is not toggled with the same HARQ process ID as the HARQ process ID of the TB transmitted in the first PTM transmission method". The above-described HARQ process ID and NDI may be indicated to the UE through the scheduling DCI.

The UE may receive retransmission data according to the PTP transmission method using the HARQ process ID and NDI for the TB received through the first PTM transmission method. When PTP transmission using the same HARQ process ID as the HARQ process ID of the TB received in the first PTM transmission method is performed, the UE may determine that the PTP transmission is a retransmission for the first PTM transmission. Alternatively, if PTP transmission using "NDI that is not toggled and HARQ process ID identical to the HARQ process ID of the TB received in the first PTM transmission method" is performed, the terminal retransmits the PTP transmission as a retransmission for the first PTM transmission. can judge The above-described HARQ process ID and NDI may be indicated to the UE through the scheduling DCI.

The base station may perform downlink transmission for one or more terminals based on the second PTM transmission scheme. One or more terminals may receive downlink data from the base station based on the second PTM transmission scheme. The terminal may inform the base station of a reception result (eg, HARQ feedback) for downlink data received according to the second PTM transmission scheme. The downlink data retransmission procedure may be performed according to a reception result of the corresponding downlink data. The base station may perform a retransmission procedure for downlink data. A retransmission procedure for data according to the second PTM transmission method may be performed based on the second PTM transmission method. Accordingly, the terminal may receive retransmission data based on the second PTM transmission method.

Alternatively, a retransmission procedure for data according to the second PTM transmission method may be performed based on the first PTM transmission method. When the reception result for downlink data transmitted based on the second PTM transmission method is NACK, the base station may perform a retransmission procedure for the corresponding downlink data based on the first PTM transmission method. Accordingly, the terminal may receive retransmission data based on the first PTM transmission method.

Alternatively, a retransmission procedure for data according to the second PTM transmission method may be performed based on the PTP transmission method. When the reception result for downlink data transmitted based on the second PTM transmission method is NACK, the base station may perform a retransmission procedure for the corresponding downlink data based on the PTP transmission method. Accordingly, the terminal may receive retransmission data based on the PTP transmission method.

The base station may perform a retransmission procedure in the PTP transmission method using the HARQ process ID and NDI for the TB transmitted in the second PTM transmission method. The base station may perform a retransmission procedure for the second PTM transmission by performing PTP transmission using the same HARQ process ID as the HARQ process ID of the TB transmitted using the second PTM transmission method. The base station may perform the retransmission procedure in the PTP transmission method by using "the same HARQ process ID and non-toggle NDI as the HARQ process ID of the TB transmitted in the second PTM transmission method". The above-described HARQ process ID and NDI may be indicated to the UE through the scheduling DCI.

The UE may receive retransmission data according to the PTP transmission method using the HARQ process ID and NDI for the TB received through the second PTM transmission method. When PTP transmission using the same HARQ process ID as the HARQ process ID of the TB received in the second PTM transmission method is performed, the UE may determine that the PTP transmission is a retransmission for the second PTM transmission. Alternatively, when PTP transmission using "NDI that is not toggled with HARQ process ID identical to the HARQ process ID of the TB received in the second PTM transmission method" is performed, the UE retransmits the PTP transmission as a retransmission for the second PTM transmission. can judge The above-described HARQ process ID and NDI may be indicated to the UE through the scheduling DCI.

Meanwhile, the base station may perform periodic downlink communication as in the embodiment shown in FIG. 8 . Common downlink communication for one or more terminals may be performed periodically. HARQ feedback for periodic downlink communication may be transmitted based on an ACK/NACK feedback scheme or a NACK-only feedback scheme. HARQ feedback for periodic downlink communication may not be performed according to system settings.

The HARQ feedback method for periodic downlink communication may be determined based on a configuration for periodic downlink communication using a higher layer message. The UE may determine the HARQ feedback method for periodic downlink transmission by using HARQ feedback method related information among configuration information for periodic downlink communication.

The HARQ feedback method for periodic downlink communication may be indicated through an activation message of periodic downlink communication. The UE may determine the HARQ feedback method for periodic downlink transmission by using the HARQ feedback method indicated through the activation message of periodic downlink communication.

The base station may perform a retransmission procedure for periodic downlink communication of one or more terminals. In this case, the base station may perform a retransmission procedure based on the PTP transmission method. In the retransmission procedure, the base station may transmit the PDSCH scrambled by the CS-RNTI. Also, the base station may transmit toggled NDI for retransmission.

When periodic downlink communication is performed, the terminal may transmit a reception result (eg, HARQ feedback) for downlink data to the base station. When the reception result of downlink data is NACK, the terminal may perform a reception operation of retransmission data. Retransmission data for periodic downlink communication may be received based on a PTP transmission scheme. The UE may receive retransmission data using CS-RNTI. When the NDI for the received PDSCH using the CS-RNTI is toggled, the UE may determine that the corresponding PDSCH is a retransmission PDSCH for periodic downlink communication.

When the same PDSCH for one or more terminals is scheduled, the base station may configure a separate feedback resource for the corresponding PDSCH, and send a higher layer message (eg, RRC configuration information) including configuration information of the feedback resource to the terminal can be transmitted The UE may check the feedback resource by receiving the higher layer message. When the feedback resource is configured by a higher layer message, the UE may transmit HARQ feedback for the PDSCH by using the corresponding feedback resource.

When the PDSCH is scheduled by the group common PDCCH, the UE may transmit HARQ feedback for the corresponding PSDCH using a separate feedback resource. When the PDSCH is scheduled by MB-RNTI, the UE may transmit HARQ feedback for the corresponding PSDCH using a separate feedback resource.

When the HARQ feedback transmission for the individual PDSCH and the HARQ feedback transmission for the common PDSCH collide in the same time interval, the UE may transmit the HARQ feedback for the individual PDSCH. Alternatively, when HARQ feedback transmission for an individual PDSCH and HARQ feedback transmission for a common PDSCH collide in the same time interval, the UE may not transmit HARQ feedback for the individual PDSCH. Here, the individual PDSCH may mean a PDSCH transmitted to one terminal, and the common PDSCH may mean a PDSCH transmitted to a plurality of terminals.

Alternatively, when HARQ feedback transmission for an individual PDSCH and HARQ feedback transmission for a common PDSCH collide in the same time interval, the UE may transmit HARQ feedback for the common PDSCH. Alternatively, when HARQ feedback transmission for an individual PDSCH and HARQ feedback transmission for a common PDSCH collide in the same time interval, the UE may not transmit HARQ feedback for the common PDSCH.

When HARQ feedback transmission for an individual PDSCH and HARQ feedback transmission for a common PDSCH are required in the same time interval, the UE concatenates the HARQ feedback for the individual PDSCH and the HARQ feedback for the common PDSCH, thereby providing one HARQ feedback (e.g., , HARQ codebook (codebook)) can be generated. In the HARQ codebook, HARQ feedback (eg, HARQ information bit) for an individual PDSCH may be located in the front region, and HARQ feedback (eg, HARQ information bit) for a common PDSCH is HARQ for individual PDSCH It can be placed after feedback. Alternatively, in the HARQ codebook, the HARQ feedback for the common PDSCH may be located in the front region, and the HARQ feedback for the individual PDSCH may be located after the HARQ feedback for the common PDSCH. A position at which the HARQ information bit is disposed within the HARQ feedback may vary according to priority.

The base station may allocate a separate Downlink Assignment Index (DAI) to each of the individual PDSCH and the common PDSCH. The DAI configured by the base station may be transmitted to the terminal through DCI. The UE may determine that a separate DAI exists for each of the individual PDSCH and the common PDSCH, and may interpret the DAI based on this.

The base station may set a priority for common PDSCH transmission. Also, the base station may set a priority for HARQ-ACK transmission (eg, HARQ feedback transmission) corresponding to common PDSCH transmission. The base station may indicate (or set) "priority information of common PDSCH transmission" and/or "priority information of HARQ-ACK transmission for common PDSCH" to the terminal. The terminal may receive "priority information of common PDSCH transmission" and/or "priority information of HARQ-ACK transmission for common PDSCH" from the base station. The above-mentioned priority information may be transmitted to the terminal using at least one of a higher layer message (eg, RRC configuration information), MAC CE, or DCI (eg, DCI for scheduling a common PDSCH).

The base station determines whether "priority information of common PDSCH transmission" and/or "priority information of HARQ-ACK transmission for common PDSCH" is included in DCI through a higher layer message (eg, RRC configuration information) through the terminal can be directed to When it is indicated through the higher layer message that the priority information is included in the DCI, the base station may transmit the DCI including the priority information. The DCI may be a DCI for scheduling a common PDSCH. When it is not indicated that the priority information is included in DCI through the higher layer message (that is, when a separate higher layer message indicating whether the priority information is included in DCI is not transmitted), the base station DCI without ranking information may be transmitted. When the priority of the common PDSCH is not indicated through DCI, the UE may determine that the priority of the common PDSCH is low.

The terminal may receive information indicating whether "priority information of common PDSCH transmission" and/or "priority information of HARQ-ACK transmission for common PDSCH" is included in DCI through a higher layer message from the base station. . When it is indicated through a higher layer message that the priority information is included in the DCI, the UE may check the priority information through a field in the DCI. The UE may check the priority information in the DCI for scheduling the common PDSCH, and may determine that the priority information is a priority related to the PDSCH scheduled by the DCI. The UE may transmit the HARQ-ACK for the corresponding common PDSCH based on the corresponding priority information. The UE may perform the HARQ-ACK codebook generation operation or HARQ-ACK multiplexing operation by using the corresponding priority information.

When a separate higher layer message indicating whether priority information is included in DCI is not received, the UE may determine that priority information is not included in DCI. If a separate higher layer message is not received, the terminal may determine "priority of common PDSCH transmission" and/or "priority of HARQ-ACK transmission for common PDSCH" as "low priority". If a separate higher layer message indicating whether priority information is included in DCI is not received, the terminal may determine the priority for the common PDSCH as "low priority", and based on the determined priority HARQ-ACK may be transmitted. The UE may perform the HARQ-ACK codebook generation operation or HARQ-ACK multiplexing operation by using the corresponding priority information.

The base station may instruct the terminal to transmit a plurality of HARQ-ACKs in one uplink time interval. In this case, the UE may transmit the HARQ-ACK based on priority information in one uplink time interval. The base station may instruct the terminal to transmit HARQ-ACK transmission(s) for one or more common PDSCHs in the same uplink time interval. In this case, the terminal may transmit the HARQ-ACK based on the priority information indicated by the base station. When the priority of the first common PDSCH is the same as the priority of the second common PDSCH in the same uplink time interval, the UE multiplexes the HARQ-ACK of the first common PDSCH and the HARQ-ACK of the second common PDSCH, thereby multiplexing HARQ -ACKs may be generated and multiplexed HARQ-ACKs may be transmitted. The multiplexed HARQ-ACKs may be a HARQ codebook.

When the priority of the first common PDSCH is different from the priority of the second common PDSCH in the same uplink time interval, the UE multiplexes the HARQ-ACK of the first common PDSCH and the HARQ-ACK of the second common PDSCH, thereby multiplexing HARQ -ACKs may be generated and multiplexed HARQ-ACKs may be transmitted. When the priority of the first common PDSCH is higher than the priority of the second common PDSCH in the same uplink time interval, the UE may transmit HARQ-ACK for the first common PDSCH, and HARQ-ACK for the second common PDSCH You can drop the transmission. When the priority of the first common PDSCH is different from the priority of the second common PDSCH in the same uplink time interval, the UE may transmit the HARQ-ACK according to a preset rule.

The base station may transmit the common PDSCH and the individual PDSCH, and the terminal may receive the common PDSCH and the individual PDSCH from the base station. The common PDSCH and the individual PDSCH may be transmitted/received in one time interval.

The base station may instruct (or configure) the terminal to transmit the HARQ-ACK for the common PDSCH and the HARQ-ACK for the individual PDSCH in one time interval. The above-described operation instruction may be transmitted through an upper layer message, a MAC layer message, and/or a physical layer message. The UE may transmit the HARQ-ACK for the common PDSCH and/or the HARQ-ACK for the individual PDSCH in one time interval based on the indication of the base station. In this case, the terminal may transmit the HARQ-ACK based on the priority information indicated by the base station.

When the priority for the common PDSCH is the same as the priority for the individual PDSCH, the UE can generate multiplexed HARQ-ACKs by multiplexing the HARQ-ACK for the common PDSCH and the HARQ-ACK for the individual PDSCH, and HARQ-ACKs may be transmitted. Alternatively, when the priority for the common PDSCH is the same as the priority for the individual PDSCH, the UE may transmit the HARQ-ACK for the individual PDSCH and may not transmit the HARQ-ACK for the common PDSCH.

When the priority for the common PDSCH is different from the priority for the individual PDSCH, the UE can generate multiplexed HARQ-ACKs by multiplexing the HARQ-ACK for the common PDSCH and the HARQ-ACK for the individual PDSCH, and HARQ-ACKs may be transmitted. Alternatively, when the priority for the common PDSCH is different from the priority for the individual PDSCH, the UE may transmit a HARQ-ACK for the PDSCH having a high priority (eg, a common PDSCH or an individual PDSCH), and a low priority The PDSCH having a priority may not be transmitted. Alternatively, when the priority for the common PDSCH is different from the priority for the individual PDSCH, the UE may transmit the HARQ-ACK according to a preset rule.

Next, methods of determining the transmission resource of HARQ-ACK will be described. In the downlink transmission procedure, the base station may indicate (or configure) the transmission resource of HARQ-ACK for downlink data to the terminal. The base station may indicate the transmission resource of HARQ-ACK by using DCI for scheduling downlink transmission. The terminal may receive transmission resource information of HARQ-ACK from the base station. The transmission resource information of HARQ-ACK may be included in the scheduling DCI received from the base station.

The transmission resource information of HARQ-ACK may include time resource information. The time resource information may indicate a time interval and/or a slot (eg, a slot index, the number of slots) in which the HARQ-ACK is transmitted. In addition, the time resource information may include an offset. The offset may indicate an interval (eg, the number of slots) between a slot in which DCI is transmitted and a slot in which HARQ-ACK is transmitted. The UE may check time resource information (eg, time interval, slot information, offset) of HARQ-ACK, and may determine a time resource for transmitting HARQ-ACK based on the time resource information.

The transmission resource information of HARQ-ACK may further indicate other information as well as a time slot in which HARQ-ACK is transmitted. For example, the transmission resource information of HARQ-ACK may further include at least one of a format used for transmission of HARQ-ACK, time information in units of symbols, and sequence related information. The base station may transmit DCI including transmission resource information of HARQ-ACK to the terminal. For example, transmission resource information of HARQ-ACK may be indicated by a PRI (PUCCH Resource Indicator) field included in DCI.

The terminal may receive transmission resource information of HARQ-ACK from the base station, and information included in the transmission resource information (eg, time slot, format used for transmission of HARQ-ACK, time information in units of symbols, and / or sequence related information). The transmission resource information of HARQ-ACK may be indicated by DCI (eg, PRI field included in DCI) received from the base station.

Next, when the HARQ-ACK transmission resource for the individual PDSCH and the HARQ-ACK transmission resource for the common PDSCH are configured in the same time slot, HARQ-ACK transmission methods will be described.

12 is a conceptual diagram illustrating a second embodiment of a method for transmitting feedback information in a communication system.

Referring to FIG. 12 , the base station may transmit a PDCCH (eg, DCI) for PDSCH scheduling to the terminal. The PDCCH may include transmission resource information of HARQ-ACK for PDSCH transmission. The transmission resource information of HARQ-ACK may include at least one of time slot information or PRI in which HARQ-ACK is transmitted. The UE may receive a PDCCH for scheduling PDSCH transmission from the base station. The UE may check transmission resource information of HARQ-ACK for the PDSCH through the corresponding PDCCH.

The base station may transmit PDCCH #n after transmitting PDCCH #(n-1). The transmission resource (eg, slot #m) of the HARQ-ACK indicated by the newly transmitted PDCCH #n is the transmission resource of the HARQ-ACK indicated by the previously transmitted PDCCH #(n-1) (eg, , slot #m). Each of n and m may be a natural number. The base station may indicate (or configure) one slot (eg, slot #m) as transmission resources of HARQ-ACKs for a plurality of PDSCHs. The plurality of PDSCHs may include PDSCH #(n-1) scheduled by PDCCH #(n-1) and PDSCH #n scheduled by PDCCH #n. In this case, one of the plurality of PDSCHs may be a common PDSCH, and the other may be an individual PDSCH.

The UE may receive PDCCH #(n-1), and may receive PDCCH #n after PDCCH #(n-1). The transmission resource of HARQ-ACK indicated by PDCCH #n (eg, slot #m) is the transmission resource of HARQ-ACK indicated by PDCCH #(n-1) (eg, slot #m) and can be the same. That is, one slot (eg, slot #m) may be indicated (or configured) as transmission resources of HARQ-ACKs for a plurality of PDSCHs. In this case, the UE may multiplex HARQ-ACKs for a plurality of PDSCHs (eg, a common PDSCH and an individual PDSCH), and may transmit the multiplexed HARQ-ACKs in one slot.

The base station may transmit PDCCH #(n-1) including PRI #(n-1) and PDCCH #n including PRI #n. According to a plurality of PDCCHs (eg, PDCCH #(n-1) and PDCCH #n), one slot (eg, slot #m) is a transmission resource of HARQ-ACKs for a plurality of PDSCHs can be indicated as For example, PRI #(n-1) may indicate slot #m, and PRI #n may indicate slot #m.

In this case, it may be assumed that HARQ-ACK transmission is performed by PRI #n included in PDCCH #n transmitted later among a plurality of PDCCHs (eg, a plurality of PDCCHs for scheduling individual PDSCHs). The UE may receive PDCCH #(n-1) and PDCCH #n from the base station, and may check PRIs included in each of PDCCH #(n-1) and PDCCH #n. When one slot is indicated by transmission resources of HARQ-ACKs for a plurality of PDSCHs, the UE receives PDCCH #n later from among a plurality of PDCCHs (eg, a plurality of PDCCHs for scheduling individual PDSCHs) HARQ-ACK may be transmitted based on PRI #n included in . In another method, when one slot is indicated by transmission resources of HARQ-ACKs for a plurality of PDSCHs (eg, a plurality of different types of PDSCHs), the terminal determines the types of the plurality of PDSCHs (eg, , common PDSCH, individual PDSCH), HARQ-ACK may be transmitted based on PRI #n included in PDCCH #n received later.

Alternatively, when the priority of the common PDSCH is higher than that of the individual PDSCH, the UE may transmit only the common PDSCH in slot #m, and the transmission of the individual PDSCH may be dropped. When the priority of the common PDSCH is lower than that of the individual PDSCH, the UE may transmit only the individual PDSCH in slot #m, and the transmission of the common PDSCH may be dropped.

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 in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the computer-readable medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software.

Examples of computer-readable media include hardware devices specially configured to store and carry out program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or 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 invention, and vice versa.

Although it has been described with reference to the above embodiments, it will be understood by those skilled in the art that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. will be able

Claims (20)

A method of operating a terminal in a communication system, comprising:
Receiving a higher layer message including information indicating that first downlink control information (DCI) including a hybrid automatic repeat request (HARQ) feedback enable/disable indicator is configured from the base station;
receiving the first DCI from the base station;
receiving first downlink data from the base station based on first scheduling information included in the first DCI; and
and determining whether to transmit a first HARQ response to the first downlink data based on the HARQ feedback enable/disable indicator included in the first DCI. The method according to claim 1,
When the HARQ feedback enable/disable indicator indicates to enable HARQ feedback, the first HARQ response is transmitted to the base station, and the HARQ feedback enable/disable indicator indicates to disable the HARQ feedback. In the case where the first HARQ response is not transmitted to the base station, the method of operation of the terminal. The method according to claim 1,
The higher layer message or the first DCI further includes information indicating a HARQ feedback scheme, and when the HARQ feedback scheme is an ACK (acknowledgement)/NACK (negative ACK) feedback scheme, the first transmitted to the base station The HARQ response includes ACK or NACK, and when the HARQ feedback scheme is a NACK-only scheme, the first HARQ response transmitted to the base station includes only NACK. The method according to claim 1,
The method of operation of the terminal,
receiving a second DCI from the base station;
receiving second downlink data from the base station based on second scheduling information included in the second DCI;
generating multiplexed HARQ responses by multiplexing the first HARQ response and a second HARQ response for the second downlink data; and
Transmitting the multiplexed HARQ responses to the base station through the same slot,
A first feedback resource indicated by the first DCI and a second feedback resource indicated by the second DCI are configured in the same slot. 5. The method according to claim 4,
The multiplexed HARQ responses are a HARQ codebook, and the arrangement of the multiplexed HARQ responses in the HARQ codebook is determined according to each type of the first downlink data and the second downlink data. Operation of a terminal Way. The method according to claim 1,
The method of operation of the terminal,
receiving a second DCI from the base station;
receiving second downlink data from the base station based on second scheduling information included in the second DCI; and
When the first feedback resource indicated by the first DCI and the second feedback resource indicated by the second DCI are configured in the same slot, a higher priority among the first downlink data and the second downlink data The method of operating a terminal further comprising: transmitting a HARQ response for one downlink data having a priority to the base station through the same slot. 7. The method of claim 6,
The priority of each of the first downlink data and the second downlink data varies depending on a type of downlink data, and the type of downlink data is classified into individual downlink data and common downlink data, and the individual The downlink data is downlink data transmitted to one terminal, and the common downlink data is downlink data transmitted to a plurality of terminals. The method according to claim 1,
The method of operation of the terminal,
receiving a second DCI from the base station;
receiving second downlink data from the base station based on second scheduling information included in the second DCI; and
At least one of the first HARQ response or the second HARQ response to the second downlink data using a HARQ feedback resource indicated by one DCI received late in the time domain among the first DCI and the second DCI Further comprising the step of transmitting the HARQ response of to the base station, the terminal operating method. The method according to claim 1,
The first downlink data is individual downlink data transmitted to one terminal or common downlink data transmitted to a plurality of terminals, and priority information of the individual downlink data and priority information of the common downlink data is included in the upper layer message, the operating method of the terminal. A method of operating a terminal in a communication system, comprising:
HARQ (hybrid automatic repeat request) feedback enable (enabled) / disable (disabled) DCI (downlink control information) including the indicator is not configured to receive a first higher layer message containing information indicating that the base station to receive step;
Receiving a second higher layer message including information indicating whether to transmit HARQ feedback from the base station;
receiving a first DCI from the base station;
receiving downlink data from the base station based on the scheduling information included in the first DCI; and
and determining whether to transmit an HARQ response to the downlink data based on information included in the second higher layer message. 11. The method of claim 10,
When the second higher layer message indicates transmission of the HARQ feedback, the HARQ response is transmitted, and when the second higher layer message does not indicate transmission of the HARQ feedback, the transmission of the HARQ response is determined above. Determined based on the basic settings of the communication system, the operating method of the terminal. 11. The method of claim 10,
The first higher layer message, the second higher layer message, or the first DCI further includes information indicating a HARQ feedback scheme, and the HARQ feedback scheme is an ACK (acknowledgement) / NACK (negative ACK) feedback scheme. In this case, the HARQ response transmitted to the base station includes ACK or NACK, and when the HARQ feedback scheme is a NACK-only scheme, the HARQ response transmitted to the base station includes only NACK, The method of operation of a terminal. 11. The method of claim 10,
When the HARQ feedback scheme of the HARQ response is not indicated by the base station, the HARQ response is transmitted based on a default HARQ feedback scheme, and the default HARQ feedback scheme is an ACK/NACK feedback scheme or NACK-only feedback method, the method of operation of the terminal. 11. The method of claim 10,
The first DCI further includes a PRI (physical uplink control channel (PUCCH) resource indicator) indicating a HARQ feedback resource, and the HARQ response is transmitted from the HARQ feedback resource indicated by the PRI. Method of operation of a terminal . A method of operating a base station in a communication system, comprising:
Transmitting a higher layer message including information indicating that first downlink control information (DCI) including a hybrid automatic repeat request (HARQ) feedback enable/disable indicator is configured;
transmitting a first DCI including the HARQ feedback enable/disable indicator and first scheduling information to the terminal;
transmitting first downlink data to the terminal based on the first scheduling information; and
and determining whether to perform a reception operation of a first HARQ response to the first downlink data based on the HARQ feedback enable/disable indicator. 16. The method of claim 15,
When the HARQ feedback enable/disable indicator indicates to enable HARQ feedback, the reception operation of the first HARQ response is performed, and the HARQ feedback enable/disable indicator indicates to disable the HARQ feedback. In the case where the receiving operation of the first HARQ response is not performed, the operating method of the base station. 16. The method of claim 15,
The higher layer message or the first DCI further includes information indicating a HARQ feedback scheme, and when the HARQ feedback scheme is an ACK (acknowledgement)/NACK (negative ACK) feedback scheme, the first HARQ response is ACK or Including NACK, and when the HARQ feedback scheme is a NACK-only scheme, the first HARQ response includes only NACK. 16. The method of claim 15,
The method of operation of the base station,
transmitting a second DCI including second scheduling information to the terminal;
transmitting second downlink data to the terminal based on the second scheduling information; and
When the first feedback resource indicated by the first DCI and the second feedback resource indicated by the second DCI are configured in the same slot, a second response for the first HARQ response and the second downlink data Further comprising the step of receiving a HARQ response from the terminal in the same slot,
The method of operating a base station, wherein the first HARQ response and the second HARQ response are multiplexed within the same slot. 16. The method of claim 15,
The method of operation of the base station,
transmitting a second DCI including second scheduling information to the terminal;
transmitting second downlink data to the terminal based on the second scheduling information; and
When the first feedback resource indicated by the first DCI and the second feedback resource indicated by the second DCI are configured in the same slot, a higher priority among the first downlink data and the second downlink data The method of operating a base station further comprising: receiving a HARQ response for one downlink data having a rank from the terminal in the same slot. 16. The method of claim 15,
The first downlink data is individual downlink data transmitted to one terminal or common downlink data transmitted to a plurality of terminals, and priority information of the individual downlink data and priority information of the common downlink data is included in the higher layer message, the operating method of the base station.

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