KR20200096151A - Feedback method for repetition transmission of uplink in communication system - Google Patents

Abstract

A feedback method for repeated transmission of an uplink (UL) in a communication system is disclosed. According to the present invention, an operation method of a terminal comprises the steps of: receiving downlink (DL) data #1 from a base station through a DL data channel #1; receiving DL data #2 from the base station through a DL data channel #2; and when each of an UL control channel #1 to which a hybrid automatic repeat request (HARQ) response #1 for the DL data #1 is transmitted and an UL control channel #2 to which a HARQ response #2 for the DL data #2 overlaps a UL data channel allocated by the base station, transmitting the HARQ response #1 and the HARQ response #2 to the base station through the UL data channel. Accordingly, the performance of the communication system may be increased.

Description

Feedback method for repeated uplink transmission in a communication system {FEEDBACK METHOD FOR REPETITION TRANSMISSION OF UPLINK IN COMMUNICATION SYSTEM}

The present invention relates to a feedback technology in a communication system, and more particularly, to a transmission technology of a hybrid automatic repeat request (HARQ) response for repeated uplink transmission.

For the processing of rapidly increasing radio data, a frequency band higher than the frequency band of LTE (long term evolution) (or LTE-A) (eg, a frequency band of 6 GHz or less) (eg, a frequency band of 6 GHz or higher) A communication system using (for example, a new radio (NR) communication system) is being considered. The NR communication system can support not only a frequency band of 6 GHz or less but also a frequency band of 6 GHz or more, and can support various communication services and scenarios compared to the LTE communication system. For example, the usage scenario of the NR communication system may include enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communication (URLLC), and Massive Machine Type Communication (mMTC).

Meanwhile, in order to support high reliability requirements in a communication system, a low coding rate can be maintained. When a low coding rate is used and a time resource is used in the mapping process of a physical resource (for example, a resource grid), a new codeword generated based on a new information bit is mapped. There may be no physical resource to be made. In this case, time resources may be consumed for physical resource mapping of a new codeword. This may mean a queue delay or a delay in the scheduler. When the transmission delayed information bit is DCI (downlink control information), the transmission delay of DCI may be referred to as DCI blocking.

Transmission of information bits can be delayed until physical resources are available. In this case, transmission of a new codeword may not be performed before all transmission of the existing codeword is completed. In addition, the base station may transmit downlink data after performing a downlink physical resource mapping operation, and receive a hybrid automatic repeat request (HARQ) response (eg, acknowledgment (ACK)) that is feedback for downlink data. can do. The HARQ response may be transmitted through an uplink control channel, and the uplink data channel may be transmitted to the base station after encoding and/or modulation processes.

When the terminal operates in a communication system supporting time division duplex (TDD), the base station can dynamically change the shape of the slot. When the number of transmittable uplink symbols is small, the terminal may maintain a constant reception quality of the HARQ response by transmitting an uplink control channel in two or more slots. In this case, the terminal may repeatedly transmit the HARQ response.

In order to transmit downlink data that satisfies the URLLC requirement to the terminal located at the cell boundary, the base station may determine whether to feedback the HARQ response to the downlink data. In the existing communication system, the base station may determine whether to retransmit the information bit on the assumption that the terminal always feeds back the HARQ response for downlink data. In this case, the HARQ response may be transmitted in consideration of the power situation of the terminal, and the terminal may transmit a small amount of HARQ response with high power using a narrow band. Therefore, transmission of the HARQ response may be delayed.

In addition, the UE may not be able to transmit two or more uplink channels due to power limitation. Therefore, when a new HARQ response is generated, the terminal may transmit a new HARQ response using a new uplink control channel.

An object of the present invention for solving the above problems is to provide a method of transmitting a hybrid automatic repeat request (HARQ) response for repeated uplink transmission in a communication system.

In order to achieve the above object, a method of operating a terminal according to a first embodiment of the present invention includes receiving DL data #1 from a base station through DL data channel #1, and DL data #2 through DL data channel #2. Receiving from the base station, and UL control channel #1 to which HARQ response #1 for the DL data #1 is transmitted, and UL control channel #2 to which HARQ response #2 for the DL data #2 is transmitted, respectively And transmitting the HARQ response #1 and the HARQ response #2 to the base station through the UL data channel when overlapping with the UL data channel allocated by the base station.

Here, at least one of the DL data channel #1 and the DL data channel #2 may be indicated by a dynamic scheduling method, and the remaining DL data channels may be indicated by a semi-fixed scheduling method.

Here, when the priority of each of the DL data #1 and the DL data #2 is the same as the priority of UL data to be transmitted through the UL data channel, the HARQ response #1 and the HARQ response #2 are the UL data It can be multiplexed on the channel.

Here, each of the UL control channel #1 and the UL control channel #2 may be set in a sub-slot unit, and the UL data channel may be set in a slot unit including two or more sub-slots.

Here, one HARQ response codebook including the HARQ response #1 and the HARQ response #2 may be generated, and the one HARQ response codebook may be multiplexed in the UL data channel.

Here, the one HARQ response codebook may be set in a slot unit including two or more sub-slots.

Here, the arrangement positions of the HARQ response #1 and the HARQ response #2 in the one HARQ response codebook are based on a reception time (eg, reception timing) of the DL data #1 and the DL data #2. Can be determined.

Here, in the one HARQ response codebook, the arrangement positions of the HARQ response #1 and the HARQ response #2 are the reception of DL scheduling information #1 of the DL data #1 and DL scheduling information #2 of the DL data #2. It can be determined based on the viewpoint.

Here, the UL scheduling information of the UL data channel may be received after the DL scheduling information #1 of the DL data #1 and the DL scheduling information #2 of the DL data #2, and the size of the UL data channel is the HARQ It may be set in consideration of the size of response #1 and the size of HARQ response #2.

Here, the size of the UCI including the HARQ response #1 and the HARQ response #2 may be estimated by UL scheduling information of the UL data channel, and the puncturing operation or rate matching operation for the UL data channel is It can be performed based on the estimated size of the UCI.

Here, the encoding timing of the HARQ response #1 may be the same as the encoding timing of the HARQ response #2.

Here, the HARQ response #1 may be multiplexed in radio resources overlapping or adjacent to the UL control channel #1 among radio resources occupied by the UL data channel, and the HARQ response #2 is applied to the UL data channel. Among the radio resources occupied by the UL control channel #2, it may be multiplexed on a radio resource overlapping or adjacent to it.

Here, when the UL data channel is transmitted based on a frequency hopping method, the HARQ response #1 may be multiplexed on the UL data channel of hop #n, and the HARQ response #2 is the UL data of hop #m. It may be multiplexed in a channel, and each of n and m may be a different natural number.

Here, when the UL data channel includes a plurality of UL data channel instances, the HARQ response #1 may be multiplexed in the UL data channel instance #n, and the HARQ response #2 is multiplexed in the UL data channel instance #m. May be, and each of n and m may be a different natural number.

Here, when the UL control channel #1 overlaps with the UL data channel instance #n and the UL data channel instance #n+1, the HARQ response #1 is a time from among the UL data channel instances #n and #n+1. When the UL data channel instance #n located first in the domain may be multiplexed, and the UL control channel #2 overlaps the UL data channel instance #m and the UL data channel instance #m+1, the HARQ response #2 May be multiplexed in the UL data channel instance #m located first in the time domain among the UL data channel instances #m and #m+1.

Here, when the DL data channel #2 is located after the DL data channel #1 in the time domain, the interval between the last symbol of the DL data channel #2 and the start symbol of the UL data channel is an interval set by the base station It can be more than that.

In order to achieve the above object, a method of operating a base station according to a second embodiment of the present invention includes transmitting DL data #1 to a terminal through DL data channel #1, and DL data #2 through DL data channel #2. Transmitting to the terminal, generating UL scheduling information of a UL data channel in consideration of the size of the HARQ response #1 for the DL data #1 and the size of the HARQ response #2 for the DL data #2 , Transmitting the UL scheduling information to the terminal, and receiving UL data, the HARQ response #1, and the HARQ response #2 in the UL data channel indicated by the UL scheduling information, Each of the UL control channel #1 to which the HARQ response #1 is transmitted and the UL control channel #2 to which the HARQ response #2 is to be transmitted overlap the UL data channel.

Here, when the priority of each of the DL data #1 and the DL data #2 is the same as the priority of UL data to be transmitted through the UL data channel, the HARQ response #1 and the HARQ response #2 are the UL data It can be multiplexed on the channel.

Here, when the UL data channel is transmitted based on a frequency hopping method, the HARQ response #1 may be multiplexed on the UL data channel of hop #n, and the HARQ response #2 is the UL data of hop #m. It may be multiplexed in a channel, and each of n and m may be a different natural number.

Here, when the UL data channel includes a plurality of UL data channel instances, the HARQ response #1 may be multiplexed in the UL data channel instance #n, and the HARQ response #2 is multiplexed in the UL data channel instance #m. May be, and each of n and m may be a different natural number.

According to the present invention, when physical uplink control channels (PUCCHs) overlap in the time domain, a plurality of hybrid automatic repeat request (HARQ) response bits related to the corresponding PUCCHs may be multiplexed within one HARQ response codebook. In addition, when the PUCCH overlaps with a physical uplink shared channel (PUSCH) in the time domain, HARQ response bits to be transmitted through the PUCCH may be multiplexed in the PUSCH. In addition, PDSCHs belonging to the same subset may be mapped to one PUCCH, and HARQ responses for PDSCHs belonging to the same subset may be transmitted through a PUCCH mapped to a corresponding subset. Accordingly, the HARQ response can be efficiently transmitted, and the performance of the communication system can be improved.

1 is a conceptual diagram showing a first embodiment of a communication system.
2 is a block diagram showing the first embodiment of a communication node constituting a communication system.
3 is a timing diagram showing a first embodiment of a scheduling method in a communication system.
4 is a conceptual diagram illustrating a first embodiment of an encoding method for generating UCI in a communication system.
5 is a conceptual diagram illustrating a second embodiment of an encoding method for generating UCI in a communication system.
6 is a conceptual diagram illustrating a third embodiment of an encoding method for generating UCI in a communication system.
7 is a timing diagram showing a first embodiment of a method for transmitting UCI in a communication system.
8 is a flowchart illustrating a second embodiment of a method for transmitting UCI in a communication system.
9A is a conceptual diagram illustrating a first embodiment of overlapping UL control channels in a time domain.
9B is a conceptual diagram illustrating a second embodiment of overlapping UL control channels in a time domain.
9C is a conceptual diagram illustrating a third embodiment of overlapping UL control channels in a time domain.
9D is a conceptual diagram illustrating a fourth embodiment of overlapping UL control channels in a time domain.
9E is a conceptual diagram illustrating a fifth embodiment of overlapping UL control channels in a time domain.
10 is a conceptual diagram illustrating a first embodiment of a mapping relationship between a DL data channel and a UL control channel in a communication system.
11A is a conceptual diagram showing a first embodiment of a method for setting a DL data channel in a communication system.
11B is a conceptual diagram showing a second embodiment of a method for setting a DL data channel in a communication system.
12 is a conceptual diagram showing a third embodiment of a method for setting a DL data channel in a communication system.
13 is a conceptual diagram showing a first embodiment of a set including a valid TDRA index in a communication system.
14 is a conceptual diagram showing a first embodiment of a pattern of a subslot in a communication system.
15 is a conceptual diagram showing a second embodiment of a pattern of a subslot in a communication system.
16 is a conceptual diagram showing a third embodiment of a subslot pattern in a communication system.
17 is a conceptual diagram showing a fourth embodiment of a subslot pattern in a communication system.
18 is a conceptual diagram showing a fifth embodiment of a subslot pattern in a communication system.
19 is a conceptual diagram showing a sixth embodiment of a pattern of subslots in a communication system.
20 is a conceptual diagram showing a seventh embodiment of a pattern of a subslot in a communication system.
21 is a conceptual diagram showing an eighth embodiment of a pattern of a subslot in a communication system.
22 is a conceptual diagram showing a first embodiment of a feedback method of a HARQ response in a communication system.
23 is a conceptual diagram showing a second embodiment of a feedback method of a HARQ response in a communication system.
24 is a conceptual diagram illustrating a third embodiment of a feedback method of a HARQ response in a communication system.
25 is a conceptual diagram illustrating a fourth embodiment of a feedback method of a HARQ response in a communication system.
26 is a conceptual diagram illustrating a fifth embodiment of a feedback method of a HARQ response in a communication system.
27 is a conceptual diagram illustrating a sixth embodiment of a method for feedback of a HARQ response in a communication system.
28 is a conceptual diagram showing a seventh embodiment of a feedback method of a HARQ response in a communication system.
29 is a conceptual diagram illustrating an eighth embodiment of a feedback method of a HARQ response in a communication system.
30 is a conceptual diagram illustrating a ninth embodiment of a feedback method of a HARQ response in a communication system.
31 is a conceptual diagram showing a tenth embodiment of a feedback method of a HARQ response in a communication system.
32 is a conceptual diagram illustrating an eleventh embodiment of a method for feedback of a HARQ response in a communication system.
33 is a conceptual diagram showing a first embodiment of a method for setting a TDRA index in a communication system.
34A is a conceptual diagram illustrating a second embodiment of a method for setting a TDRA index in a communication system.
34B is a conceptual diagram showing a third embodiment of a method for setting a TDRA index in a communication system.
34C is a conceptual diagram showing a fourth embodiment of a method for setting a TDRA index in a communication system.
35A is a conceptual diagram illustrating a first embodiment of a DL SPS configuration method for supporting DL URLLC traffic in a communication system.
35B is a conceptual diagram illustrating a second embodiment of a DL SPS configuration method for supporting DL URLLC traffic in a communication system.
35C is a conceptual diagram showing a third embodiment of a DL SPS configuration method for supporting DL URLLC traffic in a communication system.

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

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

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and that one or more other features are present. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings 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 an overall understanding, the same reference numerals are used for the same elements in the drawings, and duplicate descriptions for the same elements 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 contents described below, and the embodiments according to the present invention can be applied to various communication systems. Here, the communication system may be used in the same sense as the communication network.

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

Referring to FIG. 1, the communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). A plurality of communication nodes are 4G communication (e.g., long term evolution (LTE), LTE-A (advanced)), 5G communication (e.g., new radio) specified in the 3rd generation partnership project (3GPP) standard. ), etc. 4G communication may be performed in a frequency band of 6 GHz or less, and 5G communication may be performed in a frequency band of 6 GHz or more as well as a frequency band of 6 GHz or less.

For example, for 4G communication and 5G communication, a plurality of communication nodes may include a code division multiple access (CDMA) based communication protocol, a wideband CDMA (WCDMA) based communication protocol, a time division multiple access (TDMA) based communication protocol, Frequency division multiple access (FDMA)-based communication protocol, OFDM (orthogonal frequency division multiplexing)-based communication protocol, Filtered OFDM-based communication protocol, CP (cyclic prefix)-OFDM-based communication protocol, DFT-s-OFDM (discrete) Fourier transform-spread-OFDM)-based communication protocol, OFDMA (orthogonal frequency division multiple access)-based communication protocol, SC (single carrier)-FDMA-based communication protocol, NOMA (Non-orthogonal Multiple Access), GFDM (generalized frequency) Division multiplexing)-based communication protocol, filter bank multi-carrier (FBMC)-based communication protocol, universal filtered multi-carrier (UFMC)-based communication protocol, and space division multiple access (SDMA)-based communication protocol can be supported. .

In addition, the communication system 100 may further include a core network. When the communication system 100 supports 4G communication, the core network may include a serving-gateway (S-GW), a packet data network (PDN)-gateway (P-GW), a mobility management entity (MME), and the like. have. When the communication system 100 supports 5G communication, the core network may include a user plane function (UPF), a session management function (SMF), an access and mobility management function (AMF), and the like.

Meanwhile, a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130- constituting the communication system 100 4, 130-5, 130-6) Each may have the following structure.

2 is a block diagram showing the 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 transmission/reception device 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 component included in the communication node 200 may be connected through a separate interface or a separate bus centered on the processor 210, not the common bus 270. 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 refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in 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 read only memory (ROM) and random access memory (RAM).

Referring back to FIG. 1, the communication system 100 includes a plurality of base stations 110-1, 110-2, 110-3, 120-1, 120-2, and a plurality of terminals 130- 1, 130-2, 130-3, 130-4, 130-5, 130-6). Base stations (110-1, 110-2, 110-3, 120-1, 120-2) and terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) The containing communication system 100 may be referred to as an “access network”. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the cell coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the cell coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong within the cell coverage of the third base station 110-3. have. The first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the cell coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is a NodeB, an evolved NodeB, gNB, and a base transceiver station (BTS). ), a radio base station, a radio transceiver, an access point, an access node, and the like. Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is a user equipment (UE), a terminal, an access terminal, and a mobile device. It may be referred to as a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, and the like.

Meanwhile, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in a different frequency band or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul link or a non-ideal backhaul link, , Information can be exchanged with each other through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to the core network through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits a signal received from the core network to the corresponding terminal 130-1, 130-2, 130-3, 130 -4, 130-5, 130-6), and the signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) Can be transferred to.

In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 transmits MIMO (e.g., single user (SU)-MIMO, multi-user (MU)- MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, direct communication between terminals (device to device communication, D2D) (or, ProSe ( proximity services)). Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is a base station 110-1, 110-2, 110-3, 120-1 , 120-2) and operations supported by the base stations 110-1, 110-2, 110-3, 120-1, and 120-2. For example, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO scheme, and the fourth terminal 130-4 can transmit a signal to the fourth terminal 130-4 by the SU-MIMO scheme. A signal may be received from the second base station 110-2. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO method, and the fourth terminal 130-4 And each of the fifth terminal 130-5 may receive a signal from the second base station 110-2 by the MU-MIMO method.

Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on the CoMP scheme, and The terminal 130-4 may receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 by the CoMP method. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 has terminals 130-1, 130-2, 130-3, and 130-4 belonging to their cell coverage. , 130-5, 130-6) and the CA method can transmit and receive signals. Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 can control D2D between the fourth terminal 130-4 and the fifth terminal 130-5. In addition, each of the fourth terminal 130-4 and the fifth terminal 130-5 may perform D2D under the control of the second base station 110-2 and the third base station 110-3. .

Next, methods of transmitting and receiving a hybrid automatic repeat request (HARQ) response in a communication system will be described. Even when a method (for example, transmission or reception of a signal) performed in the first communication node among the communication nodes is described, the corresponding second communication node corresponds to a method performed in the first communication node (eg For example, signal reception or transmission) may be performed. That is, when the operation of the terminal is described, the base station corresponding thereto may perform the operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, a terminal corresponding thereto may perform an operation corresponding to the operation of the base station.

In the following embodiments, the DL control channel may mean a downlink control channel (DCI) or a radio resource used for transmission of DCI, and the DL data channel is for transmission of a DL data unit or a DL data unit. May mean used radio resources. The UL control channel may mean an uplink control channel (UCI) or a radio resource used for transmission of UCI, and the UL data channel may mean a radio resource used for transmission of a UL data unit or UL data unit. .

The DL control channel may be a physical downlink control channel (PDCCH), and the DL data channel may be a physical downlink shared channel (PDSCH). The UL control channel may be a physical uplink control channel (PUCCH), and the UL data channel may be a physical uplink shared channel (PUSCH). In addition, in the following embodiments, the base station may refer to a serving base station, and the terminal may refer to a terminal connected to the serving base station.

3 is a timing diagram showing a first embodiment of a scheduling method in a communication system.

Referring to FIG. 3, a base station may transmit DCI through a PDCCH, and may transmit downlink data to a terminal through a PDSCH scheduled by a corresponding DCI. The terminal can receive the DCI from the base station, and can receive downlink data scheduled by the corresponding DCI from the base station. The terminal may transmit an HARQ response for downlink data to the base station. The HARQ response may be transmitted through PUCCH. In the following embodiments, the HARQ response may mean HARQ-ACK (acknowledgement). The UE may transmit one or more uplink control channels (eg, PUCCH). In this case, the HARQ response may be repeatedly transmitted.

Meanwhile, the terminal may receive a downlink (DL) control channel (eg, DCI) from a base station (eg, a serving base station). The terminal may receive the DL data channel scheduled by the DL control channel, and transmit UCI including the HARQ response for the DL data channel to the base station. UCI can be transmitted through the UL control channel.

The resources of the UL control channel may be indicated by the base station. For example, the base station may set a plurality of resources (eg, UL control channel candidates) for the UL control channel in the terminal using higher layer signaling (eg, radio resource control (RRC) signaling). . In the following embodiments, the higher layer signaling operation may be performed using an RRC message. The base station indicates to the terminal one resource (e.g., one UL control channel candidate) for the UL control channel using an implicit signaling method or an explicit signaling method (e.g., a specific field included in DCI) can do.

The time resource information of the UL control channel is the index of the slot in which the UL control channel is located, the index of the UL symbol in which the UL control channel is located (for example, the index of the first UL symbol), and/or the UL control channel is occupied. It may include the number of UL symbols. The frequency resource information of the UL control channel includes the index of the resource block in which the UL control channel is located (eg, the index of the first resource block), the number of resource blocks occupied by the UL control channel, and the UL control channel. It may include information indicating whether frequency hopping is performed, information about generating a spread sequence for a UL control channel, and/or information about generating a reference signal for a UL control channel.

Meanwhile, the terminal may transmit channel state information (CSI) to a base station (eg, a serving base station) using a UL control channel. The terminal may feed back CSI to the base station using a semi-static reporting method or a dynamic reporting method. The base station may set a type of CSI fed back using higher layer signaling and a physical resource (eg, a UL control channel) for CSI feedback to the terminal.

Alternatively, the terminal may know the location of the radio resource to which the DL data channel is allocated from the DL control channel, and may know feedback information (eg, resource information) for a HARQ response for the DL data channel. The UE can indirectly know a service corresponding to DL data (e.g., enhanced Mobile BroadBand (eMBB) service or Ultra Reliable Low Latency Communication (URLLC) service) based on the search space in which the DL assignment is detected). have. Or, the terminal uses a sequence used for scrambling of DCI (or DL allocation information) or a service corresponding to DL data using a radio network temporary identifier (RNTI) (eg, eMBB service or URLLC service) Can be known indirectly.

DCI (for example, DCI cyclic redundancy check (CRC)) is scrambled by MCS-C-RNTI (modulation and coding scheme-cell-radio network temporary identifier) or DCI in a search space set by higher layer signaling When is received, the UE may assume that the DL data channel indicated by the corresponding DCI includes a transport block (TB) or a code block group (CBG) for the URLLC service.

The terminal may feed back the HARQ response for TB or CBG to the base station. The HARQ response may be transmitted through a UL control channel or a UL data channel. The UE may check the resources of the UL control channel (or UL data channel) used for transmission of the HARQ response through a field included in the DCI. The base station (eg, the serving base station) may configure sets of resources for the UL control channel (eg, resource sets of UL control channel candidates) in the terminal using higher layer signaling.

The UE may select one set of resources for the UL control channel based on the amount of UL control information (eg, UCI) included in the UL control channel from among sets configured by uplink signaling. In this case, the terminal may select one set of resources for the UL control channel based on a field included in the DCI received from the base station. In order to feed back UCI to the base station in a communication system supporting the URLLC service, the terminal may process the UCI in less time units compared to the conventional communication system. In a conventional communication system, UCI can be processed in units of slots. The UE may process UCI in units of subslots, units of minislots, or units of symbols that are smaller than the unit of slots.

In the suggested way UCI In the case of repeated transmission, the terminal has a small number of transmissions during the codebook generation process. UCI In a column of good quality To map Can.

If the UCI is not repeatedly transmitted, the terminal may generate a codebook using a conventional method. When the UCI is repeatedly transmitted, the quality of the UCI (eg, reception quality) may be different because the size of the codebook is changed. The quality of UCI may mean an error rate. A column having good quality may mean a column having a low error rate in the generation matrix G. The codeword C may be obtained through a codebook or a product (G·u) of the information bit (u) and the generation matrix (G).

Considering the i-th codebook, the information bit may be expressed as u(i), and the codeword may be expressed as G(i)·u(i). Since the information bit is expressed as a column vector, a codeword may also be given as a column vector. The matrix multiplication operation may be performed in a finite field (GF(2)) composed of 0 and 1. In the following embodiments, UCI may mean a HARQ response (eg, HARQ-ACK), and the following embodiments may be applied to a CSI transmission operation. Bits of the information bits expressed in scalar may be expressed as vectors, and the information bits may be formed by concatenating the bits expressed as vectors.

In the following embodiment, it is assumed that m(i)∈0,1 is the i-th generated UCI, and that UCI is repeatedly transmitted K times. When the UE transmits UCI once (K=1), it may be defined as u(i)=m(i). When the UE transmits UCI more than once (K≥2), Equation 1 below may be defined.

f _i,K may mean a permutation function for mixing K elements applied to the i-th codebook. When UCI is a HARQ response, u(i) may be a column vector composed of K bits. When the UE does not generate UCI, u(i) may be a column vector composed of bits of K-1 or less. The probability that the terminal generates UCI may be the same as the probability that the base station transmits the DL control channel to the terminal. Considering the feedback on the DL data channel, since the base station transmits the TB according to the arrival probability (arrival rate), the probability of generating UCI may be the same as the arrival probability of the TB.

The permutation function f _i,K can output inputs in ascending or descending order. The permutation function f _i,K may be a permutation function in which the UCI allocated first is placed first. Alternatively, in the proposed method, the permutation function f _i,K may be a permutation function that mixes K elements so that the error rate of UCI is minimized.

일 수 있고, i+1번째 정보 비트는

일 수 있다. 부호어는 K개의 비트들로 구성되는 정보 비트로부터 생성될 수 있다. 제안되는 방법에 의하면, 하나의 UCI는 K번 발생할 수 있다.When K=2, the UE may generate a codebook (or information bit) by multiplexing the i-th UCI and the i+1-th UCI. the i-th information bit is

And the i+1th information bit is

Can be The codeword can be generated from information bits composed of K bits. According to the proposed method, one UCI can occur K times.

4 is a conceptual diagram illustrating a first embodiment of an encoding method for generating UCI in a communication system.

Referring to FIG. 4, when transmission of the UL control channel is not completed, a new UCI may be generated. Here, it may be K=2. In order to apply the block coding operation, m(i) may be transmitted twice. f _i may be expressed as an interleaver or permutation function that generates a codebook. Block interleaving may be selectively performed, and a concatenation operation may be performed by a concatenater.

5 is a conceptual diagram illustrating a second embodiment of an encoding method for generating UCI in a communication system.

Referring to FIG. 5, a new UCI may be generated when transmission of the UL control channel is not completed. Here, it may be K=4. m(i) can be transmitted 4 times. Block interleaving may be selectively performed, and a concatenation operation may be performed by a concatenation device.

The codeword generated by the terminal may be expressed as a product of a generation matrix and information bits. Therefore, the codeword generated by the terminal may be defined as in Equation 2 below.

In Equation 2, f _i,K may be a result of selecting the basis of the generation matrix. Since the UE repeatedly transmits UCI twice (K=2), the codeword considered by the base station (eg, serving base station) may be an extension matrix rather than a generation matrix. In this case, Equation 3 below may be defined. Equation 3 may represent a relationship between an information bit including m(i) and a codeword when K is 2. Equation 3 corresponds to a case in which UCI occurs continuously in the terminal, and the equation for generating a codeword when some UCI does not occur may be changed.

The proposed method can be applied to any block coding method. Since the Reed Muller code or the extreme code can be applied, a new operation of the terminal in the coding procedure can be minimized. The terminal may apply different coding schemes according to the size of the codebook. When the size of the codebook is 3 bits or more and 11 bits or less, the terminal may use the Reed Muller code. When the size of the codebook is 12 bits or more, the terminal can use an extreme code. In the proposed method, a method of generating a codebook may vary according to the size of the codebook.

When the size of the codebook is 11 bits or less , the basis of the generation matrix G may be selected based on the Hamming distance. In this case, a 32×11 generation matrix G corresponding to the Reed Muller code may be used. The generation matrix G may be defined as shown in Table 1 below.

(32, J)가 생성될 수 있다. J는 1 이상이고 K 이하일 수 있다. 부호어는 정보 비트와 축약된 생성 행렬(

)의 곱일 수 있다. 기지국은 DL 제어 채널에서 DAI(downlink assignment index)를 사용하여 코드북의 크기(J)를 간접적으로 단말에 알려줄 수 있다. 따라서 J는 기지국과 단말에서 동일한 값일 수 있다. 다른 방법으로, 단말은 J개의 비트로 구성된 정보 비트에 0을 붙여서 11개의 길이를 가지는 열 벡터를 생성할 수 있고, 생성된 열 벡터와 생성 행렬(G)을 곱함으로써 부호어(x)를 획득할 수 있다.J bases are selected from 11 bases by the permutation function (f _i,J ), which is the abbreviated generation matrix

(32, J) can be created. J may be 1 or more and K or less. The codeword is the information bits and the abbreviated generation matrix (

It can be a product of ). The base station may indirectly inform the terminal of the size (J) of the codebook by using a downlink assignment index (DAI) in the DL control channel. Therefore, J may be the same value in the base station and the terminal. Alternatively, the terminal can generate a column vector having a length of 11 by attaching 0 to an information bit composed of J bits, and obtain a codeword (x) by multiplying the generated column vector and the generation matrix (G). I can.

In the case of selecting a basis from the generation matrix in the proposed method, the selected basis may be independent of the index (i) of the codebook. Also, the selected basis is Time constant Can have characteristics have.

That is, the permutation function can be expressed as f _K instead of f _i,K . Since the permutation function does not need to be designed according to the index (i) of the codebook, and does not have a general functional relationship between the index (i) of the codebook and the index of UCI, the implementation complexity can be reduced. The permutation function may be separately defined according to the size (J) of the codebook (eg, the amount of the UL control channel). In the case of "K=J=2", the codeword may be defined as in Equation 4 below. The proposed method can also be applied when "K=J=4".

대신에 새로운 생성 행렬(

)인 것으로 해석될 수 있다.

는 UL 제어 채널이 가지는 오류율에 영향을 끼칠 수 있다.Equation 4 may represent a relationship between an information bit including m(i) and a codeword when K is 2. Each of a and b may be a natural number greater than or equal to 1 and less than or equal to 11, and may be independent of the index (i) of the codebook. a and b can be determined by f. In order for the base station to decode the codeword including m(i), the generation matrix is G or

Instead, a new generation matrix (

) Can be interpreted as.

May affect the error rate of the UL control channel.

In the case of selecting the basis for the generation matrix in the proposed method, the same basis may not be selected.

)을 곱함으로써 부호어를 획득할 수 있다. 생성 행렬(

)에서 m(i)의 오류율을 최소화하기 위해, G의 열들 중에서 좋은 특성을 가지는 열이 선택될 수 있다.Therefore, in Equation 4, each of a and b may have different values. In a procedure in which the terminal generates a codeword, a permutation function or a codebook generation procedure is properly defined, so that the Reed Muller code (G) can be reused as a new generation matrix. Since a is different from b, the terminal uses a generation matrix (

The codeword can be obtained by multiplying by ). Generation matrix (

) To minimize the error rate of m(i), a column having good characteristics may be selected among the columns of G.

의 부분 행렬에 해당하는

로 결정될 수 있다. K가 2이고, m(i-1)이 알려진 경우, 수학식 5는 m(i)를 포함하는 정보 비트와 부호어 간의 관계를 나타낼 수 있다.The base station (eg, the serving base station) may decode m(i-1) before decoding m(i). The base station's decoding procedure can start with codewords other than m(i-1). For example, Equation 4 may be transformed into Equation 5 below. The error rate of m(i) is

Corresponding to the submatrix of

Can be determined as When K is 2 and m(i-1) is known, Equation 5 may represent a relationship between an information bit including m(i) and a codeword.

)에 따른 부호어들 간의 해밍 거리는 최대화될 수 있다. In the proposed method, the generation matrix (

) The Hamming distance between the codewords according to the can be maximized.

의 열 벡터는 "[g_b, g_a]^T, [0, g_b]^T"로 주어질 수 있고, 부호어들 간의 해밍 거리는 "m(i-1),m(i),m(i+1)∈0,1"가 적용된 경우에도 최대화될 수 있다. 해밍 거리는 차원마다 계산될 수 있고, 단말은 Reed Muller 행렬(G)에서 해밍 거리가 먼 2개의 열들을 선택함으로써 UCI 전송을 2회 반복할 수 있고, 코드북의 크기가 2인 케이스(예를 들어, K=2, J=2)를 최적화할 수 있다.In Equation 5

The column vector of can be given as "[g _b , g _a ] ^T , [0, g _b ] ^T ", and the Hamming distance between codewords is "m(i-1),m(i),m(i+) 1) ∈0,1" can also be maximized when applied. The Hamming distance may be calculated for each dimension, and the UE may repeat UCI transmission twice by selecting two columns with a far Hamming distance in the Reed Muller matrix (G), and a case in which the codebook size is 2 (for example, K=2, J=2) can be optimized.

)에서 a는 1일 수 있고, b는 2일 수 있다.When the column vector of the Reed Muller matrix is examined, a set consisting of column vectors in which a Hamming distance of each column and a Hamming weight between columns are maximized can be obtained. The proposed generation matrix may always include a column vector consisting of only 1, and other columns of the proposed generation matrix are among the 2nd to 10th columns (e.g., 2nd to 10th columns of Table 1). It can be any one row. In addition, the proposed generation matrix may not include the 11th column (eg, the 11th column of Table 1). Here, the presented order may mean the order of the generation matrix suggested by the 3GPP technical standard (eg, NR technical standard). The proposed generation matrix (

) In a may be 1, and b may be 2.

)은 [g_b, g_a]^T만을 최적화하는 것으로 충분할 수 있다. 제안되는 방법에서 해밍 거리를 최대화하는 열은 "a=b=1"을 만족하는 열일 수 있다.When a portion of the UCI is insufficient in the terminal, J may be 1 or more and less than K. In this case, the permutation function J may be different. When m(i+1) does not exist, Equation 5 may be transformed into Equation 6 below. When K is 2, Equation 6 may represent a relationship between an information bit including m(i) and a codeword. Since the base station knows m(i-1), the generation matrix (

) May be sufficient to optimize only [g _b , g _a ] ^T. In the proposed method, the column that maximizes the Hamming distance may be a column that satisfies "a=b=1".

In the proposed method, the first bit transmitted by the permutation function f _J may correspond to a column vector consisting of only ones. Bits transmitted after the second or second time by the permutation function f _J may have a different column (eg, one column among the 2nd to 10th columns). In addition, bits transmitted after the second or second time by the column function f _J may not include the 11th column. Here, the presented order may be the order of the generation matrix suggested in the 3GPP technical standard (eg, the order of Table 1).

)을 가지는 부호어들은 큰 해밍 거리를 가질 수 있다. 제안되는 방법은 K가 10 이하인 케이스에 적용될 수 있으며, 단말은 Reed Muller 생성 행렬을 사용하는 간단한 곱 연산을 통해 부호어를 생성할 수 있다.If the proposed method is applied, a valid generation matrix (

Codewords having) may have a large Hamming distance. The proposed method can be applied to cases where K is 10 or less, and the terminal can generate a codeword through a simple multiplication operation using a Reed Muller generation matrix.

In the proposed method, the size of the codebook is 12 bits. Above , The basis of the generation matrix may be selected based on reliability.

When the size of the codebook is 12 bits or more, the terminal may generate an information bit or a codebook. The terminal may apply the CRC code, and after applying the permutation function (eg, interleaving), the extreme code may be applied.

According to the conventional method, the amount of the parity bit of the CRC may be different according to the size of the codebook, and the position of the parity bit may be different in the extreme encoding procedure. A codeword obtained as a result of CRC may have a systematic form divided into an information bit and a parity bit. The codeword of the CRC can be mapped to a bit channel having high reliability. The parity bit may be additionally generated, and the generated additional parity bit may be mapped to a bit channel having a higher reliability than the bit channel to which the previous parity bit is mapped.

The information bit and the parity bit may be concatenated, and the matrix G _N may be obtained by Kronecker multiplication of extreme-code generation matrices (eg, basic matrices defined in the 3GPP technical standard). The codeword may be obtained by multiplying the result of the concatenation between the information bit and the parity bit by the matrix G _N. The matrix G _N obtained by Kronecker product of the pole code generation matrices may be defined as in Equation 7 below.

Thereafter, the codeword may be mapped to a radio resource (eg, a resource element (RE)) after a rate matching operation is performed. The problem of determining the position in the polar coding procedure can be interpreted as a problem of designing a permutation function (f _i,J ) when the size of the codebook or the size of UCI is J.

J bases may be selected by the permutation function f _i,J , and each base may be multiplied for each bit of UCI. The base station may indirectly inform the terminal of the size (J) of the codebook using DAI in the DL control channel. Therefore, J may be the same value in the base station and the terminal. The 3GPP technical standard can define the size of the generation matrix of the extreme code in the coding procedure. Accordingly, the terminal may generate a column vector having a required length by attaching 0 to an information bit composed of J bits, and obtain a codeword by multiplying the generation matrix and the generated column vector.

In the proposed method, a basis having high reliability may be selected from a vector that is multiplied by a generation matrix of an extreme code, and the selected basis may correspond to UCI having a small number of transmissions . The 3GPP technical standard defines the order of reliability according to the size of the polar code generation matrix, and the proposed method can be implemented based on the order of the reliability defined in the 3GPP technical standard.

In the proposed method, a basis(s) having a large Hamming distance can be selected from a vector that is multiplied by the generation matrix of the pole code, and the highest reliability among two or more selected basis is when the number of selected basis is two or more. A basis having a may be selected, and the selected basis may correspond to a UCI having a small number of transmissions. The 3GPP technical standard defines the order of reliability according to the size of the polar code generation matrix, and the proposed method can be implemented based on the order of the reliability defined in the 3GPP technical standard.

In the proposed method, a codebook for optimizing the free distance in the extended generation matrix may be defined.

When a codebook is generated in the repeated transmission procedure of UCI, UCI having a small number of transmissions may be mapped to a column having good quality. The extended generation matrix in Equation 3 may be defined as in Equation 8 below. Therefore, the extended generation matrix of Equation 8 may be in the form of a time-varying linear system and may have a great influence on the error rate of information bits.

The extended generation matrix can be generalized to an arbitrary large matrix according to the size of the UCI considered. Since the size of the generalized extended generation matrix varies depending on the size of the UCI, it may be difficult to optimize the generalized extended generation matrix. Therefore, it may be desirable to give structure to the extended generation matrix, and implementation may be simplified based on this.

형태를 가질 수 있다.

는 [g_a,g_b]로 생성되는 블록 토플리츠(Toeplitz) 행태로 표현될 수 있고, 길쌈 부호로 해석될 수 있다.For example, the extended generation matrix may have time-invariant characteristics. The extended generation matrix is defined in Equation 4

It can have a shape.

Can be expressed as a block-toeplitz behavior generated by [g _a ,g _b ], and can be interpreted as a convolutional code.

6 is a conceptual diagram illustrating a third embodiment of an encoding method for generating UCI in a communication system.

Referring to FIG. 6, a coding procedure for generating a new UCI before completion of transmission of the UL control channel may be performed based on a convolutional coding scheme. Here, K may be 2. The vector may be generated according to the UCI, and the UE may generate codewords x(i) and x(i-1) by combining the previously transmitted UCI with the generated vector. In a conventional convolutional coding scheme, a convolutional operation on a codeword may be performed in units of bits. In the proposed convolutional coding scheme, a convolutional operation for a codeword may be performed in a vector unit. The constraint length of the convolutional code may be the same as the number of repeated transmissions of the terminal.

Since the codeword is generated based on the convolutional code method, the codeword having the maximum likelihood can be obtained based on the Viterbi decoding algorithm, and the error rate of the information bit is based on the free distance of the convolutional code. Can be determined. It may be desirable to obtain a codebook or [g _a , g _b ] that maximizes the free distance. In the conventional UCI encoding method, a Reed Muller code or an extreme code may be used according to the size of the UCI or the size of the codebook. In the proposed method, codes (eg, Reed Muller codes, extreme codes) can be used regardless of the size of the UCI or the size of the codebook. In the UCI repetitive transmission procedure, the size of the UCI may not be large. When the size of the UCI is large, a lot of power may be required for transmission of the UL control channel or UL data channel for the corresponding UCI.

In the proposed method, the column vector constituting the generation matrix of the Reed Muller code can be used as a basis.

In the proposed method and the proposed method described above, the error rate of UCI may be a performance criterion for designing g _a and g _b . In the proposed method, an index for determining the error rate may be a free distance, and in the proposed method described above, an index for determining the error rate may be a Hamming distance. In the proposed method, the code may have the form of a convolutional code rather than a block code, so the proposed method may include a case of a=b. When a≠b, the convolutional encoding operation may be performed in the form of multiplying the generation matrix of the Reed Muller code.

In the proposed method, the codebook can be generated in consideration of the number of repeated transmissions of UCI.

The UE may repeatedly transmit UCI. In a communication system supporting dynamic TDD, the UE operates based on an indication according to higher layer signaling or dynamic signaling (eg, DCI) of the base station to use periodic UL symbols or to improve the received power of UL. I can.

In the conventional UCI repetitive transmission procedure, the UE may map a codeword to a UL control channel or a UL data channel while maintaining the codebook in an existing state. Radio resources for the UL control channel may also be maintained in an existing state. The base station may receive UCI from the terminal, and may not instruct the corresponding terminal to transmit a new transmission before the terminal completes transmission of the UL control channel or the UL data channel.

The base station can reduce the transmission delay time of DL data or UL data by minimizing the scheduling restriction. In the DL data transmission procedure, the base station may increase the size of the TB in order to quickly acquire UCI. Since DL data is transmitted through a small number of TBs, the number of transmissions of the DL data channel can be reduced. Therefore, indirectly, the size of the UCI (eg, HARQ response) may decrease. When the size of the TB is large and the terminal fails to decode the corresponding TB, the size of the resource used by the base station for retransmission of the corresponding TB may increase. Therefore, increasing the size of TB may not be a good idea.

The codebook may be composed of UCIs mapped to the same UL control channel or UL data channel. UCI indicated by the base station may be mapped one-to-one with radio resources of the UL control channel. The mapping relationship between UCI and radio resources of the UL control channel may be applied to repeatedly transmitted UCIs. The UL control channel may be transmitted more than once in a slot, and the UL control channel may be transmitted using the same radio resource or different radio resources. The terminal may repeatedly transmit UCI as many times as indicated by the base station. Therefore, in the proposed method, the UE can generate a codebook for all UCIs multiplexed in the UL control channel or the UL data channel.

HARQ Belonging to the response codebook UCI (eg, HARQ response bit) The order may be set in an ascending or descending order of a reception time point (eg, reception timing) of the DL control channel or the DL data channel.

The base station may configure the terminal to perform a repetitive transmission procedure of the HARQ response using higher layer signaling. In order to minimize scheduling constraints, the base station may schedule to transmit a new UL control channel while the UE transmits the UL control channel.

7 is a timing diagram showing a first embodiment of a method for transmitting UCI in a communication system.

Referring to FIG. 7, the UE may transmit a new UL control channel A2 before transmission of the UL control channel B1 is completed. Here, the base station can allocate two DL control channels, and the terminal can feed back two UL control channels.

The base station can transmit the DL control channel A to the terminal, and can transmit the DL data channel A (not shown) scheduled by the DL control channel A to the terminal. The terminal may receive the DL control channel A from the base station, and may receive the DL data channel A from the base station based on scheduling information included in the DL control channel A. In addition, the base station can transmit the DL control channel B to the terminal, and can transmit the DL data channel B (not shown) scheduled by the DL control channel B to the terminal. The terminal may receive the DL control channel B from the base station, and may receive the DL data channel B from the base station based on scheduling information included in the DL control channel B. The UE may receive the DL control channel A earlier than the DL control channel B, and may receive the DL data channel A earlier than the DL data channel B.

The terminal may generate a HARQ response for the DL data channel A scheduled by the DL control channel A, and radio resources of the UL control channel used for transmission of the HARQ response (e.g., UL control channels A1-A2) Can be determined. The terminal may generate a HARQ response for the DL data channel B scheduled by the DL control channel B, and radio resources of the UL control channel used for transmission of the HARQ response (eg, UL control channels B1-B2) Can be determined.

In the conventional method, the base station may not allocate the DL control channel B to the terminal. In the proposed method, in order to reduce the transmission delay time of UCI, the base station can allocate the DL control channel B to the terminal. Since each of the time resources of the UL control channel A1 and the time resources of the UL control channel B2 do not overlap with the time resources of other UL control channels, the UE can transmit UCI using the UL control channel A1 and the UL control channel B2. Since the time resource of the UL control channel A2 overlaps the time resource of the UL control channel B1, the UE can transmit UCI using the new UL control channel C. UL control channel B1 within UL control channel C is UL It can be multiplexed with control channel A2.

The terminal may generate three HARQ response codebooks having different sizes. The HARQ response codebook for the UL control channel A1 may include a HARQ response bit for the DL data channel A scheduled by the DL control channel A. The terminal may check the size of the HARQ response codebook based on the DAI included in the DL control channel A.

The UE may generate a common HARQ response codebook for UL control channel A1 and UL control channel B1, and the common HARQ response codebook includes HARQ response bits for DL data channel A scheduled by DL control channel A and DL control channel B. It may include all HARQ response bits for DL data channel B scheduled by. The terminal may check the size of the HARQ response codebook for the UL control channel C based on the sum of the DAI included in the DL control channel A and the DAI included in the DL control channel B. The DAI included in the DL control channel B may indirectly indicate the size of the UCI (eg, HARQ response codebook) indicated by the DL control channel B.

The UL control channel B2 may include a HARQ response bit for the DL data channel B scheduled by the DL control channel B. The HARQ response codebook for the UL control channel B2 may include a HARQ response bit for the DL data channel B scheduled by the DL control channel B. The terminal may check the size of the HARQ response codebook based on the DAI included in the DL control channel B.

The terminal may regard the codebook as an information bit, and may obtain a codeword by performing an encoding operation on the information bit. The codeword may be mapped to the UL control channel A1, the UL control channel C, and the UL control channel B2. Accordingly, the size and/or order of the information bits of the UL control channel may vary for each transmission of the UL control channel of the UE.

The radio resource of the UL control channel may be obtained from the DL control channel last received by the UE from among DL control channels indicating UCI belonging to the HARQ response codebook. Accordingly, the UL control channel A1 can be obtained from the DL control channel A. The UE may select a set of UL control channels based on the size of the HARQ response codebook indicated by the DL control channel A, and a field or resource unit index of the DL control channel A (eg, a control channel element (CCE) index ) Can be used to determine one radio resource of the UL control channel A1.

The UL control channel C can be obtained from the DL control channel B. The UE may select a set of UL control channels based on the size of the newly derived HARQ response codebook, and use a field of DL control channel B or a resource unit index (e.g., CCE index) to radio the UL control channel C. One resource can be determined. The terminal may select a set of UL control channels from the size of the HARQ response codebook indicated by the DL control channel B, and the UL control channel using a field of the DL control channel B or a resource unit index (eg, CCE index). One radio resource of B2 can be determined.

UCI When transmitted using a spreading code without a codebook, the terminal may transmit UCI according to the order in which the DL data channel is received.

The base station can dynamically or semi-statically allocate the DL data channel to the terminal. The base station can set the reception period of the DL data channel using higher layer signaling (e.g., RRC message), and frequency resource information and time resource information (e.g., time resource information within a slot) DCI including) can be transmitted through a DL control channel. The terminal may receive an RRC message and a DCI (eg, a DL control channel) from the base station, and may check reception resources of the DL data channel based on the RRC message and DCI. For example, the terminal may derive an offset from a slot in which the DL control channel is received to a slot in which the DL data channel is to be received, and may derive a reception resource of the DL data channel based on the offset.

The base station may set the transmission period of the DL data channel in units shorter than the slot. For example, the base station may set the transmission period of the DL data channel to 2 or 7 symbols. The terminal may transmit a HARQ response for the DL data channel received from the base station to the base station.

In the proposed method, the terminal can transmit the UL control channel according to the reception period of the DL data channel. When the DL data channel includes one TB, the terminal may transmit one HARQ response bit (eg, HARQ-ACK bit) for one TB to the base station. The UE may multiplex the HARQ response bit for the previously received DL data channel and the HARQ response bit for the last received DL data channel on the same UL control channel. The order of HARQ response bits multiplexed on the same UL control channel may follow an order of reception of a DL data channel or an opposite order of reception of a DL data channel. For transmission of one or two UCI bits (eg, HARQ response bits), the UL control channel may have the same format (eg, format 0 or format 1). Even when the UE multiplexes HARQ response bits on the same UL control channel, there may be no change in transmission of the UL control channel.

In addition, HARQ response bits for other DL data channels (eg, dynamically allocated DL data channels) may be multiplexed in the same UL control channel as HARQ response bits for semi-statically allocated DL data channels. That is, the terminal may transmit a HARQ response bit for another DL data channel and a HARQ response bit for a semi-statically allocated DL data channel through the same UL control channel.

In the proposed method, UCI (eg, HARQ response) One-to-one to the resources of the UL control channel To be mapped And the terminal UCI and Between resources of the UL control channel Mapping UCI can be multiplexed according to the relationship.

The base station may transmit a DCI indicating feedback of the UCI to the terminal through the DL control channel. UCI may include one or more of CSI, HARQ response, and SR (scheduling request). The terminal may transmit one or more UL control channels in one slot, and this operation may be set by the base station.

In the conventional method, the HARQ response codebook (eg, HARQ-ACK codebook) may correspond to the UL control channel. In the proposed method, the HARQ response may correspond to the UL control channel, and the terminal may generate a codebook based on the correspondence between the HARQ response and the UL control channel.

8 is a flowchart illustrating a second embodiment of a method for transmitting UCI in a communication system.

Referring to FIG. 8, a base station may transmit DCI to a terminal through a DL control channel. The terminal may receive the DCI from the base station (S801). The UE may determine whether to transmit UCI based on the information included in the DCI and may check the size of the UCI. In addition, the terminal may check the resources of the UL control channel (eg, UL control channel A) based on the information included in the DCI (S802). The terminal may check whether UL control channels (eg, UL control channels A and B) overlap in the time domain (S803). The UL control channel B may be a resource of a UL control channel set before the UL control channel A.

When the UL control channel A overlaps the UL control channel B in the time domain, the UE can multiplex UCI bits, perform a concatenation operation on the multiplexed UCI bits, and perform the same encoding operation on the concatenation result. Can be done. The multiplexing procedure can be shared between the base station and the terminal, and the resource of the UL control channel can be indicated by one of the DL control channels received by the terminal.

When UL control channels indicated by the DL control channels received from the terminal overlap in the time domain, the terminal may transmit the UL control channel based on the last DL control channel among the received DL control channels. A specific field included in the last DL control channel may explicitly indicate the UL control channel. Alternatively, the last DL control channel may indicate the UL control channel using an implicit signaling method (eg, the smallest value among resource unit indexes (eg, CCE index) of the DL control channel).

When one UL control channel is indicated or when the UL control channels do not overlap in the time domain, the terminal transmits UCI using a UL control channel (eg, UL control channel A or B) indicated by the base station. Can be (S804). For example, the terminal may generate two or more HARQ response codebooks (or two or more CSI codebooks), and UL control each of two or more HARQ response codebooks (or two or more CSI codebooks) Can be mapped to channels. Two or more HARQ response codebooks (or two or more CSI codebooks) may be transmitted in one slot. That is, the terminal may transmit a plurality of HARQ responses through one slot.

When two or more UL control channels (eg, UL control channels A and B) overlap in the time domain, the terminal may generate a codebook by multiplexing a plurality of UCIs (S805). The terminal may derive a new resource for the UL control channel, and transmit UCI using the new resource (S806). Here, the UE may not be able to transmit two or more UL control channels in the same UL symbol due to transmission power limitation.

9A is a conceptual diagram showing a first embodiment of UL control channels overlapping in a time domain, FIG. 9B is a conceptual diagram showing a second embodiment of UL control channels overlapping in a time domain, and FIG. 9C A conceptual diagram showing a third embodiment of overlapping UL control channels, FIG. 9D is a conceptual diagram showing a fourth embodiment of overlapping UL control channels in a time domain, and FIG. 9E is a conceptual diagram showing a fourth embodiment of overlapping UL control channels in the time domain. It is a conceptual diagram showing a fifth embodiment.

9A to 9E, in the time domain, the UL control channel may be composed of one or two symbols. Alternatively, the UL control channel in the time domain may be composed of three or more symbols. In the time domain, the UL control channel A may overlap with the UL control channel B. Further, in the frequency domain, the UL control channel A may overlap with the UL control channel B.

Referring back to FIG. 8, the terminal may generate a codebook for each type of UCI. When the UL control channels partially overlap in the time domain, the codebook may be applied to UCI corresponding to each of the UL control channels.

When the UL control channels used for transmission of the HARQ response overlap in the time domain, the terminal may generate a codebook after placing the HARQ response bit in an appropriate position. The appropriate location can be defined in the 3GPP technical specification. The position of the HARQ response bit may be determined based on an ascending or descending order of reception points of DL data channels allocated by DCI. The reception timing may mean reception timing. The terminal may select the DL data channel(s) associated with the HARQ response(s) transmitted in the same UL symbol among HARQ responses for the DL data channels, and may generate a codebook for the selected DL data channel(s). have. This operation can be set by the base station.

When UL control channels used for CSI transmission overlap in the time domain, the UE may select some CSIs according to the priority of the CSI, and may generate a codebook for the selected CSI. The terminal can determine the priority of CSI without separate signaling from the base station. For example, the UE may determine the priority of CSI based on the content defined in the 3GPP technical standard.

When the UL control channels used for transmission of the HARQ response and CSI overlap in the time domain, the UE may generate the HARQ response codebook and the CSI codebook, and may concatenate the HARQ response codebook and the CSI codebook.

The terminal may generate a codebook for each type of UCI and may concatenate the generated codebooks. The terminal may generate a codeword by performing the same channel encoding operation, and may map the codeword to a UL control channel or a UL data channel. The number of HARQ response codebooks that can be generated in one slot (or the number of CSI codebooks) and/or the number of UL control channels that can be transmitted in one slot may be limited according to the processing capability of the terminal. The base station can inform the base station of its processing capability by using higher layer signaling, and therefore, because the base station knows the processing capability of the terminal, it can perform the scheduling operation in consideration of the processing capability of the terminal. If A exceeds the processing capability of the UE, the UE may not perform a decoding operation on the last DL data channel allocated by DCI In addition, the UE expects the eNB to schedule a transmission procedure beyond the UE’s processing capability. I can't.

In the proposed method, the terminal can generate a codebook for a specific type of UCI. When UL control channels for transmission of SR and CSI overlap (partially) in the time domain, the UE may generate a codebook for SR and may not generate a codebook for CSI. When UL control channels for HARQ response and CSI transmission are (partially) overlapped in the time domain, the UE may generate a codebook for HARQ response and may not generate a codebook for CSI. The terminal may map the generated codebook to the UL control channel. That is, the UE may report an SR or HARQ response excluding CSI to the base station.

In the proposed method, the PRI is the time resource of the DL data channel and One-to-one Can respond, UCI It can be multiplexed based on the correspondence between the PRI and the time resource of the DL data channel. PRI may mean the resource index of the UL control channel.

The terminal may receive a DL data channel scheduled by a DL control channel (eg, DCI), and may feed back a HARQ response for the DL data channel to the base station. The HARQ response may be transmitted through the UL control channel, and the UL control channel is included in the PRI or "resource unit index of the PRI and DL control channel (eg, CCE index)" included in the DCI scheduling the corresponding DL data channel. Can be dictated by

Even in a situation in which the terminal does not receive the DL control channel (eg, discontinuous transmission (DTX)), the number of UCIs determined by the base station may be the same as the number of UCIs determined by the terminal. When the number of UCIs determined by the base station is different from the number of UCIs determined by the terminal, the number of resources of the UL control channel derived from the base station may be different from the number of resources of the UL control channel derived from the terminal. In this case, the base station must perform a UL control channel detection operation in consideration of various situations. Therefore, the size of the HARQ response codebook may be indicated to the UE by higher layer signaling as well as dynamic signaling (eg, DCI).

Meanwhile, the DCI may include an offset of a slot for feedback of a HARQ response and a resource index (PRI) of a UL control channel. The resource to which the UL control channel is mapped may be indicated by a slot offset and a PRI included in the DCI. The terminal may apply a time window for generating a HARQ response codebook from a slot transmitting a UL control channel. The time window may consist of slots according to the feedback timing of the HARQ response indicated by DCI.

The terminal may generate a HARQ response bit according to a preset order for each position of scheduling possible DL data channel candidates in a slot belonging to the time window. When the actual DL data channel is allocated to the UE, the UE may express the decoding result of the TB for the corresponding DL data channel as HARQ response bits. If the DL data channel is not allocated to the UE, the UE may generate a NACK for the corresponding DL data channel (eg, a DL data channel candidate). The time window may be set in units of slots, and the feedback timing of the HARQ response may be set in units of slots. Since the UE transmits the UL control channel once in a slot, DL data channel candidates may be mapped to one UL control channel.

In order to reduce the time from the transmission time (e.g., transmission timing) of the DL control channel scheduling the DL data channel in the URLLC service to the reception time of the HARQ response for the corresponding DL data channel, the UE uses the UL control channel in the slot. It can be transmitted more than once. The transmission timing may mean transmission timing.

Since the time window of the terminal is in units of slots, DL data channel candidates may not correspond to one UL control channel. DL data channel candidates may correspond to a plurality of HARQ response codebooks. Therefore, when the size of the HARQ response codebook is semi-fixed, the size of the corresponding HARQ response codebook may increase, and accordingly, the size of the UL control channel may increase. If the base station does not perform a decoding operation on the UL control channel(s) (for example, a soft combining operation), an increase in the size of the UL control channel may be a cause of reducing the coverage of the UL control channel. have.

To solve this problem, a set of time domain resources of a DL data channel can be configured in the proposed method. Time domain resources of the DL data channel may be indicated by a slot offset (K ₁ ) for a HARQ response and a time domain resource allocation (TDRA). The set of time domain resources of the DL data channel may be a subset of the entire set of time domain resources of the DL data channel (e.g., time resources of the DL data channel indicated by pdsch-TimeDomainAllocationList) set by higher layer signaling. have. In the following embodiments, "K ₁ + TDRA" may be referred to as KTDRA. That is, KTDRA may include K ₁ and TDRA.

The serving base station may set a subset of time domain resources of the DL data channel to the terminal by using higher layer signaling. When a DL data channel is allocated, a subset to which a KTDRA belonging to a corresponding DL data channel belongs may be determined, and a size of a HARQ response codebook mapped to a UL control channel for a DCI scheduling a corresponding DL data channel may be determined.

The base station may transmit DCI including KTDRA and PRI to the terminal. The terminal can receive the DCI from the base station and can check the KTDRA and PRI included in the DCI. The UE may regard DL data channels belonging to a subset of KTDRA as DL data channel candidates, and may generate a HARQ response codebook. For example, the terminal may receive DL data through DL data channels belonging to a subset of KTDRA, and may generate a HARQ response codebook including HARQ responses to the DL data. The HARQ response codebook may be mapped to the UL control channel indicated by the PRI.

In order to configure a subset of DL data channels (e.g., a set consisting of KTDRA), the base station establishes a DL data channel(s) having the same symbol or a similar symbol as the last symbol belonging to the DL data channel indicated by the TDRA. It can be set to belong to a subset of the same KTDRA.

In the proposed method, the base station can configure the DL data channel(s) belonging to a subset of KTDRA using higher layer signaling. The UL control channel may not be limited. Since the HARQ response codebook is generated for each subset of the DL data channel(s), the base station may determine the feedback timing of the HARQ response in consideration of the processing capability of the terminal when allocating the UL control channel.

In the proposed method, the PRI can respond to KTDRA. That is, the subset consisting of resources of the UL control channel may correspond to the subset of time domain resources of the DL data channel on a one-to-one basis.

The base station may set a subset of the set having the resources of the UL control channel as elements, and in this case, all elements of the resources of the UL control channel may belong to the subset. In addition, the base station may set a subset of a set having time domain resources (eg, KTDRA) of the DL data channel as an element. In this case, all elements of the time domain resources of the DL data channel are in the subset. Can belong.

The serving base station may inform the UE of the mapping relationship between the subsets (eg, the subset to which KTDRA belongs and the subset to which the PRI belongs) using higher layer signaling. The UE can know the mapping relationship between the subset to which KTDRA belongs and the subset to which the PRI belongs through higher layer signaling. When DCI including KTDRA and PRI is received from the base station, the terminal may derive a subset of the KTDRA corresponding to the PRI according to the mapping relationship established by higher layer signaling. The derived subset of KTDRA may be DL data channel candidates to which the HARQ response codebook is applied, and the size of the HARQ response codebook may be determined based on the number of elements belonging to the derived subset of KTDRA.

Since the coverage of the UL control channel is determined by the size of the HARQ response codebook, the base station can form a subset by dividing the KTDRA list of the DL data channel as evenly as possible. In addition, the slot offset (K ₁ ) for feedback of the HARQ response may be set in units of slots. This embodiment can be performed as follows. In the following embodiments, TDRA may mean a DL data channel candidate, and PRI may mean a UL control channel candidate.

10 is a conceptual diagram illustrating a first embodiment of a mapping relationship between a DL data channel and a UL control channel in a communication system.

Referring to FIG. 10, the base station may set a TDRA for a DL data channel (eg, a DL data channel candidate) in a terminal using higher layer signaling. For example, six TDRAs may be configured within a DL duration of one slot. In addition, the base station may inform the terminal of the slot offset (K ₁ ), PRI, and the like for feedback of the HARQ response. For example, DCI including K ₁ and PRI may be transmitted from the base station to the terminal. 9 PRIs may be configured within the UL duration of one slot. In this case, a TDRA subset may be considered instead of the KTDRA subset.

The base station may classify the TDRAs into one or more subsets. For example, subset 1 may include TDRA1 and TDRA3, subset 2 may include TDRA2 and TDRA5, and subset 3 may include TDRA4 and TDRA6. In addition, the base station may classify the PRIs into one or more subsets. For example, subset 1 may include PRI1, subset 2 may include PRI2 and PRI3, and subset 3 may include PRI4 to PRI8. The subsets of the DL data channel candidate may correspond to the subsets of the UL control channel candidate. The base station is a subset of a DL data channel candidate (eg, TDRA) and a portion of a UL control channel candidate (eg, PRI) through a combination of one or more of higher layer signaling, MAC control element (CE), and DCI. The mapping relationship between sets can be informed to the terminal.

The terminal may receive the DCI from the base station, and may acquire K ₁ and PRI included in the DCI. When the DCI includes PRI2, the UE may generate a HARQ response codebook for TDRA2 and TDRA5 corresponding to PRI2. For example, since the HARQ response codebook includes a HARQ response bit for TDRA2 and a HARQ response bit for TDRA5, the size of the HARQ response codebook may be 2 bits. The terminal may map the HARQ response codebook to the UL control channel. The UL control channel used for transmission of the HARQ response codebook may be determined by K ₁ and PRI2 included in DCI.

Meanwhile, the slot may be divided into a plurality of sub-slots, and one slot may be set to correspond to the PRI. The boundary of the subslot may be indicated to the terminal by higher layer signaling. Alternatively, the boundary of the subslot may be defined in the 3GPP technical standard. The DL data channel allocated by the base station may be located in one or more sub-slots. Accordingly, the first subslot or the last subslot to which the TDRA of the DL data channel belongs may be a reference subslot. In this case, a HARQ response codebook may be generated for all DL data channel candidates belonging to the reference subslot. The UE may transmit the HARQ response codebook through the PRI indicated by the DCI within the UL duration after the slot offset (or subslot offset) indicated by the DCI from the slot (or subslot) in which the DL data channel was received. have.

The terminal may determine the size of the HARQ response codebook (eg, the number of UCIs) according to the embodiment shown in FIG. 10. For example, the terminal may determine the size of the HARQ response codebook based on a mapping relationship between the subset of the DL data channel candidate and the subset of the UL control channel candidate.

FIG. 11A is a conceptual diagram showing a first embodiment of a method for setting a DL data channel in a communication system, and FIG. 11B is a conceptual diagram showing a second embodiment of a method for setting a DL data channel in a communication system.

11A and 11B, the size of the HARQ response codebook in method A may be different for each subslot to which the DL data channel candidate belongs, and the size of the HARQ response codebook in method B is in subslots to which the DL data channel candidate belongs. It can be the same. In scheme A, subset 1 may include TDRA1, subset 2 may include TDRA2 and TDRA3, and subset 3 may include TDRA4 to TDRA6. In scheme B, subset 1 may include TDRA1 and TDRA3, subset 2 may include TDRA2 and TDRA5, and subset 3 may include TDRA4 and TDRA6.

In schemes A and B, one K ₁ can be used. The terminal may use one K ₁ indicated by the base station among a plurality of K _1s . The embodiment shown in FIG. 11 can also be applied to an embodiment using KTDRA. The DL slot may be divided into three subslots, and the subslot to which the last symbol of the DL data channel candidate belongs may be determined as the subslot to which the corresponding DL data channel candidate belongs.

In scheme A, the lengths of subslots in the time domain may be the same. In scheme A, TDRA1 (e.g., a DL data channel candidate corresponding to TDRA1) may belong to subslot 1, and TDRA2 and TDRA3 (e.g., DL data channel candidates corresponding to TDRA2 and TDRA3) are subslot 2, and TDRA4 to TDRA6 (eg, DL data channel candidates corresponding to TDRA4 to TDRA6) may belong to sub-slot 3. In this case, the size of the HARQ response codebook for subslot 1 may be 1 bit, the size of the HARQ response codebook for subslot 2 may be 2 bits, and the size of the HARQ response codebook for subslot 3 is 3 bits Can be Accordingly, the base station may receive a UL control channel having different qualities for each subslot to which the DL data channel belongs.

In scheme B, the lengths of subslots in the time domain may be different. For example, the length of the subslots may be set so that the number of TDRAs belonging to one subslot is the same. In scheme B, TDRA1 and TDRA3 (e.g., DL data channel candidates corresponding to TDRA1 and TDRA3) may belong to subslot 1, and TDRA2 and TDRA5 (e.g., DL data channel candidates corresponding to TDRA2 and TDRA5) ) May belong to subslot 2, and TDRA4 and TDRA6 (eg, DL data channel candidates corresponding to TDRA4 and TDRA6) may belong to subslot 3. Therefore, the size of the HARQ response codebook may be 2 bits regardless of the TDRA of the DL data channel candidate.

The embodiments shown in FIGS. 11A and 11B can be applied when DCI indicates one K ₁ . Even when the communication system supporting the URLLC service operates in the FDD scheme or the TDD scheme, it is not necessary to configure a plurality of K _1s by frequently changing the UL-DL configuration. However, when the size of DL data is larger than the size of UL data, if more DL resources are allocated than UL resources, the set of K ₁ may include a plurality of values. The above-described embodiment (for example, the extended method of the above-described embodiment) can be applied to an operation of generating an HARQ response codebook.

KTDRA may indicate a time domain resource. KTDRAs may be classified into a plurality of subsets, and each of the subsets may correspond to a HARQ response codebook. When the set of K ₁ includes two or more values, the DL data channel may be set as follows.

12 is a conceptual diagram showing a third embodiment of a method for setting a DL data channel in a communication system.

Referring to FIG. 12, a plurality of TDRAs may be configured in DL durations of slots 1-2. Slot 1 may be contiguous with slot 2. Alternatively, slot 1 may be discontinuous from slot 2. K ₁ and TDRA included in the DCI may indicate a time resource of a DL data channel, and TDRAs (eg, KTDRAs) may be divided into a plurality of subsets. The set of K ₁ may include a first value and a second value. First value from the set of K ₁ may be applied to the TDRA contained in the slot 1, the second value from the set of K ₁ may be applied to the TDRA included in the slot 2.

Subset 1 may include TDRA5 in slot 1, TDRA6 in slot 1, and TDRA1 in slot 2. Subset 2 may include TDRA2 in slot 2, TDRA3 in slot 2, and TDRA4 in slot 2. The base station can set the subset(s) to the terminal using higher layer signaling, and can transmit the DCI including K ₁ and TDRA to the terminal. The UE can check the subset indicated by DCI (eg, K ₁ and TDRA) among the subset(s) set by higher layer signaling, and check the size of the HARQ response codebook for the identified subset. have. Accordingly, the terminal may generate a HARQ response codebook for a subset.

The base station may configure subsets of the TDRA (eg, KTDRA) such that the decoding end time of the DL data channels is the same or similar. “Mapping relationship between DL data channel and UL control channel” and “correspondence relationship between DL data channel and subslot” may be the same as or similar to the above-described embodiment.

In the proposed method, in order to semi-statically signal the size of the HARQ response codebook, the slot may be divided into a plurality of subslots. The number of symbols included in the DL subslot may be different from the number of symbols included in the UL subslot. The first subslot or the last subslot to which the KTDRA of the DL data channel belongs may be a reference subslot, and a time window of the HARQ response codebook may be set based on the reference subslot.

The slot in which the UL control channel is transmitted (or the first subslot or the last subslot) may be derived by applying the feedback timing of the HARQ response included in the DCI. The feedback timing of the HARQ response may be set in units of slots or subslots. The resource through which the UL control channel is transmitted may be indicated by the PRI included in the DCI.

According to the definition of the subslot, the size of the HARQ response codebook for the DL data channel may be different according to the subslot to which the DL data channel is allocated and the subslot through which the UL control channel is transmitted. When the terminal receives the DCI, the size of the HARQ response codebook may be one. Alternatively, since the size of the HARQ response codebook may vary according to DCI, the reception quality (eg, error rate) of the UL control channel in the base station may be different. Therefore, it is preferable that the length of the subslot is not set so that the size of the HARQ response codebook is uniform.

In the proposed method, the DL data channel(s) may correspond to UL subslots (eg, UL subslots indicated by the base station for feedback), UCI It may be multiplexed based on the correspondence between the DL data channel(s) and the UL subslot.

The terminal may receive a DL data channel scheduled by a DL control channel (eg, DCI) from the base station, and may feed back a HARQ response for the DL data channel to the base station through the UL control channel. The UL control channel used for the feedback of the HARQ response may be indicated by the PRI included in the DCI scheduling the corresponding DL data channel or "the resource unit index of the PRI and DL control channel (eg, CCE index)". have.

In a communication system supporting the URLLC service, the time for transmission of the DL data channel and reception of the HARQ response of the corresponding DL data channel (eg, dl-DataToUL-ACK in 3GPP technical specification ) should be short. In order to satisfy the requirements of the URLLC service, a signaling operation for requesting rapid HARQ response transmission in the base station may be required, and an operation for the terminal to transmit two or more UL control channels in one UL slot may be required.

In order to support these functions, a sub-slot having a length shorter than that of the slot may be introduced into the communication system. K ₁ and/or dl- DataToUL - ACK may be set in units of subslots . The time required for feedback (eg, K ₁ ) included in the DCI scheduling the DL data channel may be set in units of subslots. The base station can inform the terminal of the boundary of the subslot, and the terminal can check the subslot used for feedback of the HARQ response for the DL data channel based on the boundary of the subslot. PRI or DAI indicated by DCI may be defined for each subslot.

In the proposed method, the base station can inform the terminal of the pattern of subslots belonging to one UL slot by using higher layer signaling. The number of subslots constituting the slot may be the same or different, and the lengths of each of the subslots may be the same or different. For example, the length of each of the subslots may be different according to the configuration of the base station.

In the proposed method, even if "a slot includes a DL symbol, a UL symbol, and/or a flexible (FL) symbol" or "a slot is set to a DL slot, UL slot, or FL slot", the above-described sub The concept of a slot can be applied. The base station may inform the terminal of a pattern of a DL subslot or UL subslot belonging to one slot. The DL subslot may be composed of “DL symbol” or “DL symbol + FL symbol”, and the lengths of each of the DL subslots may be different. The UL subslot may be composed of “UL symbol” or “UL symbol + FL symbol”, and the lengths of each of the UL subslots may be different.

In the following, methods of allocating a DL data channel using DCI and transmitting a HARQ response for a corresponding DL data channel through a UL control channel will be described. The slot may be divided into a DL (sub) slot for transmitting a DL data channel and a UL (sub) slot for transmitting a UL control channel. The DL subslot may be configured to be distinguished from the UL subslot. Alternatively, the sub-slot may be configured without distinction between DL and UL.

Sub-slots can be classified based on the following methods. The DL subslot may mean a subslot to which the last symbol of the DL data channel belongs. The UL subslot may mean a subslot to which the first symbol of the UL control channel belongs. The base station may inform the UE of the boundary of the subslot using higher layer signaling. Alternatively, the base station may inform the terminal of the number of subslots or the pattern of the subslots (eg, an index indicating the pattern of the subslots) to the UE using higher layer signaling.

In the proposed method, the base station may set a set or list including resources of UL control channels to the terminal using higher layer signaling. A set or list including resources of UL control channels may be set in units of (UL) subslots.

In the proposed method, the base station can configure the resources of the UL control channels to the terminal using higher layer signaling irrespective of the (UL) subslot, and can configure the (UL) subslot to the terminal using higher layer signaling. . The UE may derive the boundary of the (UL) subslot based on information obtained through higher layer signaling, and may classify the resources of the UL control channels based on the boundary of the (UL) subslot. Accordingly, the UE may configure a set of UL control channels belonging to the (UL) subslot.

Resources of UL control channels belonging to different (UL) subslots may be different. For example, the resource of the UL control channel belonging to the (UL) subslot 1 may be different from the resource of the UL control channel belonging to the (UL) subslot 2. Therefore, the DAI included in the DCI can be calculated for each (UL) subslot.

DCI allocating a DL data channel (e.g., dynamically allocated PDSCH) and/or RRC message (e.g., semi-persistent scheduling (SPS) PDSCH that is semi-fixedly allocated) is used for feedback of the HARQ response Resource of one UL control channel to be used may be indicated. In addition, the UE may check the resource of one UL control channel based on a combination of the index of the PRI included in the DCI and the CCE (eg, DL control channel element) to which the DCI is mapped.

Meanwhile, in a communication system supporting the URLLC service, resources of the UL control channel may be indicated only by the PRI included in the DCI. Alternatively, if the DCI does not include the PRI, the UE may check the resource of one UL control channel based on the index of the CCE to which the DCI is mapped. The resources of the UL control channel may be located in the UL slot or UL subslot(s) for feedback of the HARQ response.

DCI may include a slot offset or a subslot offset for feedback of the HARQ response. The (sub) slot offset may indicate an interval between the DL (sub) slot and the UL (sub) slot. For example, the offset included in the DCI may be an interval between the DL slot and the UL slot. Alternatively, the offset included in the DCI may be an interval between the DL slot and the UL subslot. Alternatively, the offset included in the DCI may be an interval between the DL subslot and the UL subslot. Alternatively, the offset included in the DCI may be an interval between the DL subslot and the UL slot.

The time interval for multiplexing the HARQ response may be set in units of subslots. Even when two or more UL control channels do not overlap in the time domain, when the first symbol of two or more UL control channels belongs to the same UL subslot, HARQ responses to be transmitted through two or more UL control channels will be multiplexed. I can. Alternatively, when two or more UL control channels overlap in the time domain, HARQ responses to be transmitted through two or more UL control channels may be multiplexed, and when two or more UL control channels do not overlap in the time domain, 2 HARQ responses to be transmitted through more than one UL control channel may not be multiplexed.

When the size of the HARQ response codebook is semi-fixedly set (eg, when the codebook type 1 defined in the 3GPP technical standard is used), the HARQ response codebook may be generated in units of subslots.

The DCI may include a resource of a DL data channel, a slot offset or a subslot offset for feedback of a HARQ response for the DL data channel (eg, HARQ response timing), and a PRI. The UE may check the UL (sub) slot to which the UL control channel is to be transmitted based on the HARQ response timing, and may check the resources of the UL control channel based on the PRI. The HARQ response codebook may include all HARQ response(s) transmitted through a UL (sub) slot indicated by DCI.

The terminal may encode the HARQ response codebook by using the PRI included in the last received DCI, and map the codeword to the resource of the UL control channel. When the UL control channels indicated by the PRI included in each DCI do not overlap in the time domain, if the first symbol of the UL control channels belongs to the same UL (sub) slot, the HARQ responses associated with the corresponding UL control channels are the same. It can be multiplexed in the HARQ response codebook.

When the size of the HARQ response codebook is dynamically indicated (eg, when codebook type 2 defined in the 3GPP technical standard is used), the HARQ response codebook may be generated in units of subslots.

The DCI may include a resource of a DL data channel, a slot offset or a subslot offset for feedback of a HARQ response for the DL data channel (eg, HARQ response timing), and a PRI. In addition, DCI may include DAI. DAI can be classified into counter DAI and total DAI.

The UE may check the UL (sub) slot to which the UL control channel is to be transmitted based on the HARQ response timing, and may check the resources of the UL control channel based on the PRI. The HARQ response codebook may include HARQ response(s) for DL data channels indicated by DAI among HARQ responses that can be transmitted through a UL (sub) slot indicated by DCI. DAI may be defined for each UL (sub) slot.

The terminal may encode the HARQ response codebook by using the PRI included in the last received DCI, and map the codeword to the resource of the UL control channel. When the UL control channels indicated by the PRI included in each DCI do not overlap in the time domain, if the first symbol of the UL control channels belongs to the same UL (sub) slot, the HARQ responses associated with the corresponding UL control channels are the same. It can be multiplexed in the HARQ response codebook.

In the proposed method, the base station can inform the terminal of the number of valid sets of DL data channel candidates, and the terminal can derive valid DL data channel candidates based on the number of valid sets.

In the proposed method, the base station may inform the terminal of the number of sets of DL data channels belonging to one slot using higher layer signaling, MAC CE, and/or DCI. Some indexes in the TDRA table set by higher layer signaling may not be valid depending on the slot format. The reason is that the DL data channel candidate (eg, TDRA) includes a UL symbol. Invalid TDRA indexes can be excluded from the set. The terminal may check the set(s) of valid TDRA indexes, and the number of set(s) of valid TDRA indexes may be indicated by higher layer signaling.

Valid TDRA indexes can have a specific order. Valid TDRA indexes can be located in a set in a specific order. When the number of set(s) including valid TDRA indexes is L, the terminal may classify M valid TDRA indexes into L sets. Since valid TDRA index(s) belonging to one set correspond to the same HARQ response codebook, the size of the HARQ response codebook may be determined based on the number of elements belonging to the set. Since the number of elements belonging to the set depends on the number of TDRA indexes, the format of the slot, and the number of sets, the size of the HARQ response codebook may be determined by semi-fixed signaling.

또는

개의 유효한 TDRA 인덱스들을 포함할 수 있다. 이 경우, 집합들에 포함된 유효한 TDRA 인덱스들의 개수는 균등할 수 있다. M개의 집합은

개의 유효한 TDRA 인덱스들을 포함할 수 있고, M-

×L개의 집합은

개의 유효한 TDRA 인덱스들을 포함할 수 있다. 집합들은 집합들에 포함된 유효한 TDRA 인덱스들의 개수에 따라 오름차순 또는 내림차순으로 정렬될 수 있다.For example, the set

or

May contain valid TDRA indexes. In this case, the number of valid TDRA indexes included in the sets may be equal. M sets

Can contain valid TDRA indexes, M-

×L sets

May contain valid TDRA indexes. Sets may be sorted in ascending or descending order according to the number of valid TDRA indexes included in the sets.

When the number of valid TDRA indexes belonging to the set is determined, the terminal may set valid TDRA indexes having the same or similar characteristics to the same set.

In the proposed method, the arrangement order of HARQ responses to DL data channels corresponding to valid TDRA indexes belonging to the set may be determined in ascending or descending order according to the index of the first symbol of the DL data channels in the HARQ response codebook. have. For example, the UE may select a DL data channel having the earliest last symbol in the time domain from among DL data channels corresponding to valid TDRA indices belonging to the set, and select a start symbol preceding the last symbol of the selected DL data channel. Branches may sequentially map the HARQ response(s) for the DL data channel(s) in the HARQ response codebook.

13 is a conceptual diagram showing a first embodiment of a set including a valid TDRA index in a communication system.

Referring to FIG. 13, since resources according to TDRA indexes 4 and 5 include UL symbols, TDRA indexes 4 and 5 may not be valid. If L (for example, the number of sets) is 3, the first set may contain TDRA indexes 1 and 0, the second set may contain TDRA index 3, and the third set may contain TDRA index 2 It may include. Alternatively, the first set may include the TDRA index 1, the second set may include the TDRA index 0, and the third set may include the TDRA index 2 and 3.

In the proposed method, a HARQ response for a DL data channel having a last symbol that is temporally preceded among last symbols of DL data channels corresponding to valid TDRA indexes included in the set may be located first in the HARQ response codebook. For example, if the last symbol of DL data channel n is located earlier in the time domain than the last symbol of DL data channel p, the HARQ response for DL data channel n in the HARQ response codebook is the HARQ response for DL data channel p. May be located earlier. Each of n and p may be a different natural number.

For example, the terminal may select a DL data channel having the fastest last symbol in the time domain among DL data channels corresponding to valid TDRA indexes belonging to the set, and L DL data channels from the last symbol of the selected DL data channel Valid TDRA indexes corresponding to channels can be set to the same set. When the number of DL data channels having the fastest last symbol is two or more, a DL data channel having a first symbol in the time domain among the first symbols of the corresponding DL data channels may be included in the set.

According to the slot format, TDRA indexes 4 and 5 may not be valid. When L=3, the first set may include TDRA index 1 and 0, the second set may include TDRA index 2, and the third set may include TDRA index 3. Alternatively, the first set may include the TDRA index 1, the second set may include the TDRA index 0, and the third set may include the TDRA index 2 and 3.

In a communication system supporting the URLLC service, DL data channels may be configured so as not to overlap in the time domain. In this case, some TDRA indexes may not be valid. An invalid TDRA index may be excluded from the classification procedure of the DL data channel candidate. Therefore, the number of sets including valid TDRA indexes can be reduced.

In the proposed method, the base station is used to derive the boundary of the subslot. BWP(s) You can tell the terminal.

The number of subslots constituting one slot and the number of symbols included in each subslot may correspond to different time durations according to the BWP. The time duration may be a time required for the UE to decode the DL data channel and transmit the UL control channel. The length of the subslot may be defined by the number of symbols, and the subslot may be related to the time duration.

In the proposed method, sub-slots can be defined within a reference BWP. Since the operating state (e.g., active or inactive) of the BWP to which the UL control channel belongs can be changed dynamically, a process of converting a subslot defined in the reference BWP to a subslot to be defined in the active BWP is performed. I can. The reference BWP for setting the subslot may be a BWP having a specific index among BWPs set in the terminal. For example, a BWP having an index of 0 may be regarded as a reference BWP. The base station may inform the terminal of only subslots related to one BWP. Setting of subslots related to one BWP can be applied to all BWPs. Accordingly, the amount of signaling of the setting information of sub-slots related to the BWP can be reduced.

In the proposed method, a sub-slot can be defined within all BWPs. The base station may set a plurality of BWPs in the terminal in the carrier, and may independently set the boundary of the subslot in each of the plurality of BWPs. In this case, the boundary of the sub-slot can be flexibly indicated in all BWPs.

In the proposed method, the pattern of the sub-slot (eg, the number of symbols included in the sub-slot) may be uniformly set. In this case, the pattern of the sub-slot may be set as follows.

14 is a conceptual diagram showing a first embodiment of a pattern of a subslot in a communication system.

Referring to FIG. 14, one slot may include 14 symbols, and one slot may be divided into 4 subslots. Each of subslots 0 and 2 may include 3 symbols, and each of subslots 1 and 3 may include 4 symbols. The base station may inform the UE of DL data channel candidates (eg, TDRAs) using higher layer signaling. The number of DL data channel candidates set by higher layer signaling may be 9, and the base station may transmit a DCI including a TDRA index indicating one DL data channel candidate among the 9 DL data channel candidates.

The subslot to which the last symbol of the DL data channel candidate belongs may be a subslot to which the corresponding DL data channel candidate belongs. In this case, a DL data channel candidate belonging to subslot 0 may not exist. Subslot 1 may include TDRA indexes 0 and 4, subslot 2 may include TDRA indexes 1, 5, and 6, and subslot 3 may include TDRA indexes 2, 3, 7, and 8. I can. When the subslot pattern is defined without the distribution of the TDRA index, the sizes of sets of TDRA indexes may not be uniform. That is, since the number of bits of UCI transmitted through the UL control channel is not uniform, the base station may have different UCI reception quality. Therefore, it is desirable to set the boundary of the subslot in consideration of the distribution of the TDRA index. Alternatively, it is preferable to directly set the DL data channels as a set.

15 is a conceptual diagram showing a second embodiment of a pattern of a subslot in a communication system.

Referring to FIG. 15, a pattern of a sub slot may be set to be non-uniform. One slot may include 14 symbols, and one slot may be divided into 3 subslots. The number of TDRA indexes included in the subslots may be the same. Subslot 0 may include TDRA indexes 0, 4, and 5, subslot 1 may include TDRA indexes 1, 6, and 7, and subslot 2 includes TDRA indexes 2, 3, and 8. can do. In this case, each of the sub slots may include three TDRA indexes.

HARQ responses for DL data channels belonging to the same subslot may be mapped to the same UL control channel. For example, the base station may inform the terminal of L (eg, the number of sets) and TDRA indexes (eg, DL data channel candidates) using higher layer signaling. The base station may set the number of TDRA indexes (eg, the number of DL data channel candidates) to be a multiple of L. The terminal may divide the slot into L subslots, and may set the boundaries of the subslots so that the number of TDRA indexes included in each of the L subslots is the same. The boundaries of subslots may not be uniquely divided, but sets including TDRA indexes may be uniquely determined.

The base station may inform the terminal of the non-uniform sub-slot pattern using higher layer signaling. A sub-slot may be composed of consecutive symbols, and one slot may be divided into two or more sub-slots. The lengths of the sub slots may be the same or differently set. Below, "when the number of [FL symbols + UL symbols] included in the slot is N" or "when the number of [FL symbols + DL symbols] included in the slot is N", the boundary of the L subslots is How to set up will be explained.

개의 심볼들을 포함할 수 있다. 여기서, n은 2 이상이고 L 이하인 자연수일 수 있다. 서브 슬롯 1은 N-(L-1)×

개의 심볼들을 포함할 수 있다. N=14이고 L=4인 경우는 표 2 및 표 3의 인덱스 5에 대응할 수 있다.In the proposed method, the number of symbols included in the remaining subslots except for the first subslot in one slot may be the same. The number of symbols included in the first subslot may be greater than the number of symbols included in other subslots. For example, subslot n is

It may contain three symbols. Here, n may be a natural number that is 2 or more and L or less. Sub slot 1 is N-(L-1)×

It may contain three symbols. When N=14 and L=4, it may correspond to index 5 in Tables 2 and 3.

In Table 2, the subslot pattern may be defined based on the start symbol of the subslot, and in Table 3, the subslot pattern may be defined based on the number of symbols included in the subslot. In Table 2, S ₁ may indicate the start symbol index of subslot 1, S ₂ may indicate the start symbol index of subslot 2, S ₃ may indicate the start symbol index of subslot 3, and , S ₄ may indicate the start symbol index of subslot 4. In Table 3, L ₁ may indicate the number of symbols included in subslot 1, L ₂ may indicate the number of symbols included in subslot 2, and L ₃ may indicate the number of symbols included in subslot 3 The number may be indicated, and L ₄ may indicate the number of symbols included in sub slot 4.

개의 심볼들을 포함할 수 있다. 여기서, n은 1 이상이고 L-1 이하인 자연수일 수 있다. 서브 슬롯 L은 N-(L-1)×

개의 심볼들을 포함할 수 있다.In the proposed method, the number of symbols included in the remaining subslots except for the last subslot in one slot may be the same. The number of symbols included in the last subslot may be greater than the number of symbols included in other subslots. For example, subslot n is

It may contain three symbols. Here, n may be a natural number of 1 or more and L-1 or less. Sub slot L is N-(L-1)×

It may contain three symbols.

In the proposed method, the above-described embodiment can be applied when half slots (eg, half of the slots) are used.

개의 심볼들을 포함할 수 있다. 여기서, n은 "2, …, L/2-2, L/2+1, …, L-1" 중에서 하나의 값일 수 있다.Among the subslots, the number of symbols included in two subslots may be greater than the number of symbols included in the remaining subslots. In this case, the subslot may be the last subslot in the first half slot and the last subslot in the second half slot. This embodiment can be well applied when the number L of sub slots is an even number. For example, to divide N into L subslots (eg, even number of subslots), subslot n is

It may contain three symbols. Here, n may be one of "2, …, L/2-2, L/2+1, …, L-1".

일 수 있다. 서브 슬롯 L/2에 포함되는 심볼들의 개수는 서브 슬롯 L에 포함되는 심볼들의 개수와 동일할 수 있다. 또는, 서브 슬롯 L/2에 포함되는 심볼들의 개수는 서브 슬롯 L에 포함되는 심볼들의 개수와 다를 수 있다. N=14이고, L=4인 경우, 표 2 및 표 3의 인덱스 4는 서브 슬롯 L/2에 포함되는 심볼들의 개수가 서브 슬롯 L에 포함되는 심볼들의 개수와 동일한 경우일 수 있다.The sum of the number of symbols included in subslot L/2 and the number of symbols included in subslot L is N-(L-2)×

Can be The number of symbols included in subslot L/2 may be the same as the number of symbols included in subslot L. Alternatively, the number of symbols included in subslot L/2 may be different from the number of symbols included in subslot L. When N=14 and L=4, index 4 of Tables 2 and 3 may be a case where the number of symbols included in subslot L/2 is the same as the number of symbols included in subslot L.

일 수 있고, 나머지 L-M개의 서브 슬롯들 각각에 포함된 심볼들의 개수는 (N-M×

)/(L-M)일 수 있다. N=14이고, L=4인 경우에서 표 2 및 표 3의 인덱스 2 또는 3이 사용되면, 서브 슬롯 1 및 2 각각은 3개의 심볼들을 포함할 수 있고, 서브 슬롯 3 및 4 각각은 4개의 심볼들을 포함할 수 있다.In the proposed method, some subslots may contain the same number of symbols, other subslots may contain the same number of symbols, and each of the subslots different from the number of symbols included in each of some subslots The difference between the number of symbols included in may be 1. The number of symbols included in the M subslots in one slot is

May be, and the number of symbols included in each of the remaining LM subslots is (NM×

)/(LM). When N=14 and L=4, if index 2 or 3 of Tables 2 and 3 is used, each of subslots 1 and 2 may include 3 symbols, and each of subslots 3 and 4 is 4 May contain symbols.

Meanwhile, a method for feeding back a HARQ response without setting a subslot may be used. In the proposed method, DL data channel candidates may be set as a set without subslot configuration. For example, the TDRA indexes shown in FIG. 14 or 15 may be divided into L sets. The base station may inform the terminal of L sets including TDRA indices using higher layer signaling.

For example, the base station may set TDRA indexes 0, 4, and 5 as set 1, set TDRA indexes 1, 6, and 7 as set 2, and set TDRA indexes 2, 3, and 8 as set 3 Can be set. The base station may inform the terminal of the configuration information of sets 1-3 (eg, a TDRA index included in each of the sets) using higher layer signaling.

This method can be interpreted as a method of setting a TDRA sub-table from a TDRA table including TDRA indexes. The UE may multiplex HARQ responses for TDRA indexes (eg, DL data channel candidates) belonging to the same set in the same HARQ response codebook, and may perform an encoding operation for the HARQ response codebook, and the codeword It can be mapped to the UL control channel.

In the proposed method, different sub-slot boundaries may be derived according to the format of the slot.

In the proposed method, all symbols (eg, 14 symbols) included in a slot can be set as sub-slots. When the sub-slot is set irrespective of the format of the slot, a signaling operation for indicating the pattern of the sub-slot may be simply performed.

For example, in a communication system supporting the FDD scheme, since a DL symbol does not exist in a slot through which a UL channel is transmitted, all symbols included in the slot may be set as subslots. In a communication system supporting the TDD scheme, all symbols included in a slot may be configured as subslots. Among the symbols included in the slot, the FL symbol and the UL symbol other than the DL symbol may be set as subslots. Alternatively, all symbols included in a slot through which a DL channel is transmitted may be configured as subslots. Alternatively, among symbols included in the slot, FL symbols and DL symbols other than UL symbols may be set as subslots. FL symbols may mean all FL symbols belonging to a slot. Alternatively, the FL symbols may mean some FL symbols among consecutive FL symbols.

In the proposed method, some symbols (eg, less than 14 symbols) included in a slot may be set as subslots. This embodiment can be applied to a communication system supporting the TDD scheme. The base station may inform the terminal of the slot pattern by using a combination of one or more of higher layer signaling, MAC CE, and DCI. The boundary of the sub-slot may be determined by higher layer signaling. The terminal may determine symbols included in the subslots based on the slot pattern set by higher layer signaling. The DL symbol(s) included in the slot through which the UL channel is transmitted may not be set as a subslot. In this case, fewer than 14 symbols may be configured as subslots. In addition, UL symbol(s) included in a slot through which a DL channel is transmitted may not be set as a subslot. In this case, fewer than 14 symbols may be configured as subslots. The base station may inform the terminal of the number of subslots (eg, L) using higher layer signaling. In this case, the UE may classify “FL symbol + UL symbol” or “DL symbol + FL symbol” included in the slot into L subslots.

In the proposed method, FL The symbol is It may belong to a DL subslot or a UL subslot.

When a slot includes all DL symbols, FL symbols, and UL symbols, a method of configuring a DL subslot with only DL symbols may be considered in order to determine a subslot pattern. When the DL data channel is allocated by DCI, the FL symbol may be set as a DL subslot. When the DL data channel is allocated by an RRC message (eg, SPS PDSCH), the FL symbol may not be used as a DL subslot. When the HARQ response for the DL data channel allocated by DCI and the HARQ response for the DL data channel allocated by the RRC message are multiplexed in the same HARQ response codebook, the DL subslot is preferably composed of DL symbols and FL symbols. Do.

16 is a conceptual diagram showing a third embodiment of a subslot pattern in a communication system.

Referring to FIG. 16, a slot may include 8 DL symbols, 4 FL symbols, and 2 UL symbols. The DL subslot may consist of DL symbols and FL symbols. The TDRA index may mean a DL data channel candidate. The TDRA table used in the embodiment shown in FIG. 16 may be the same as the TDRA table used in the embodiment shown in FIG. 14 or 15.

The DL data channel may be allocated to the terminal using TDRA indexes 0, 1, 4, 5, 6, and/or 7. A TDRA index corresponding to DL subslot 0 may not exist, DL subslot 1 may include TDRA indexes 0, 4, and 5, and DL subslot 2 includes TDRA indexes 1, 6, and 7 can do. When a HARQ response codebook having a semi-fixed size is used, three HARQ responses can be generated if the DL data channel belongs to DL subslot 1, and three HARQ responses if the DL data channel belongs to DL subslot 2. Can be created.

In a communication system supporting the TDD scheme, a DL section and a UL section may be divided by FL symbols. FL symbols to which data is not allocated may exist in consideration of the delay arrival time. In this case, since the base station should not allocate a DL data channel having a corresponding FL symbol to a terminal, a DL data channel having a semi-fixed size can be configured without the corresponding FL symbol.

In the proposed method, the serving base station can inform the terminal of the type of the FL symbol using higher layer signaling. FL symbols having type A may be included in the DL subslot, and FL symbols having type B (eg, FL symbols to which data is not allocated) may not be included in the DL subslot. In the time domain, an FL symbol having type A may be contiguous with an FL symbol having type B. In this case, the types of FL symbols located before a specific view may be different from the types of FL symbols located after a specific view, and FL symbols located before a specific view may be distinguished from FL symbols located after a specific view. FL symbols having type B located before or after a specific point in time may not be included in the DL subslot. FL symbols having type B may be set as a guard period or a UL transmission period.

17 is a conceptual diagram showing a fourth embodiment of a subslot pattern in a communication system.

Referring to FIG. 17, a slot may include 8 DL symbols, 4 FL symbols, and 2 UL symbols. Two consecutive FL symbols positioned after the DL symbol may be FL symbols having type A, and two consecutive FL symbols positioned before the UL symbol may be FL symbols having Type B. 10 symbols included in the slot (eg, 8 DL symbols + 2 FL symbols) may be used to configure 3 DL subslots. Each of the DL subslots 0 and 1 may include 3 symbols, and the DL subslot 2 may include 4 symbols.

TDRA index corresponding to DL subslot 0 may not exist, DL subslot 1 may include TDRA indexes 0 and 4, and DL subslot 2 may include TDRA indexes 1, 5, and 6. . When the pattern of the DL subslots is set differently (for example, when DL subslot 0 is not set), two DL subslots can be set, and one DL subslot corresponds to two TDRA indexes. In addition, the remaining DL subslots may correspond to three TDRA indexes.

In the proposed method, FL The symbol(s) is It may belong to both the DL subslot and the UL subslot.

The FL symbol(s) belonging to the slot may be included in only DL subslots, only UL subslots, or both DL subslots and UL subslots. The DL data channel and the UL control channel allocated by DCI may be transmitted through the FL symbol. When the size of the HARQ response codebook is determined by the RRC message, one or more FL symbols may be included in the DL subslot and/or the UL subslot.

When one or more FL symbols are included in only the DL subslot or only the UL subslot, the base station sets information of the FL symbols constituting the DL subslot (e.g., the index of the FL symbol located at the boundary of the DL subslot, DL The index of the FL symbol not included in the subslot) and/or the setting information of the FL symbol constituting the UL subslot (eg, the index of the FL symbol located at the boundary of the UL subslot, the FL not included in the UL subslot) Symbol index) to the terminal.

18 is a conceptual diagram showing a fifth embodiment of a subslot pattern in a communication system.

Referring to FIG. 18, a slot may include 8 DL symbols, 4 FL symbols, and 2 UL symbols. Four FL symbols may be included in the DL subslot and the UL subslot. 12 or fewer symbols may be used to configure DL subslots.

When the DL subslot pattern 1 is used, DL subslot 0 may include 4 symbols, DL subslot 1 may include 4 symbols, and DL subslot 2 may include 4 symbols. have. When the DL subslot pattern 2 is used, DL subslot 0 may include 6 symbols, DL subslot 1 may include 4 symbols, and DL subslot 2 may include 2 symbols. have. When the DL subslot pattern 3 is used, DL subslot 0 may include 8 symbols, and DL subslot 1 may include 4 symbols.

The DL data channel candidate corresponding to the TDRA index 7 may not be allocated to secure the UL-DL switching time in slot n. The DL data channel candidate corresponding to the TDRA index 7 may be considered when configuring the DL subslot pattern. Six or fewer symbols may be used to configure UL subslots. UL subslot 0 may include 3 symbols, and UL subslot 1 may include 3 symbols.

19 is a conceptual diagram showing a sixth embodiment of a pattern of subslots in a communication system.

Referring to FIG. 19, a slot may include 3 DL symbols, 9 FL symbols, and 2 UL symbols. The base station may inform the UE of the configuration information of the FL symbol used for the DL subslot and the configuration information of the FL symbol used for the UL subslot to the UE by using higher layer signaling. Five consecutive FL symbols after the DL symbol may be used to configure DL subslots. Therefore, 8 symbols can be used to configure DL subslots. Two consecutive FL symbols before the UL symbol may be used to configure the UL subslot. Therefore, 4 symbols can be used to configure UL subslots. DL data channel candidates belonging to the DL subslots may be considered valid.

In the proposed method, the boundary of the subslots can be derived based on the number of subslots or the subslot pattern.

In the proposed method, the base station may transmit information indicating the boundary of subslots to the terminal through a combination of one or more of higher layer signaling, MAC CE, and DCI. When L subslots (eg, subslot 1 to L) are set within one slot, subslot 1 is the first symbol of the slot (eg, symbol 0, the first symbol other than the DL symbol, Or, since it is set in any of the FL symbols), a signaling operation indicating subslot 1 may be unnecessary. The signaling operation of the start symbol indexes of subslots 2 to L may be required.

For example, the base station may inform the terminal of (S ₁ , S ₂ , …, S _L ) or (S ₁ , S ₂ , …, S _{L - 1} ). Alternatively, the base station may inform the terminal of (L, S ₁ , S ₂ , …, S _L ) or (L, S ₁ , S ₂ , …, S _{L - 1} ). Alternatively, the base station may inform the terminal of the end symbol index of the subslots. Alternatively, the base station may inform the UE of the length of the subslots (eg, the number of symbols included in the subslots). In the above-described embodiments, L-1 or more symbol indices may be signaled from the base station to the terminal.

Meanwhile, implementation complexity in the base station and the terminal may increase due to the signaling operation of L-1 or L symbol indices. In the proposed method, sub-slot patterns may be indicated in the form of an index. When the subslot patterns are predefined, the base station may transmit the index of the subslot pattern to the terminal through a combination of one or more of higher layer signaling, MAC CE, and DCI. The index of the subslot pattern may indicate the number of subslots included in the slot, the number of symbols included in the subslots, and/or the boundary of the subslots. Even when the number of subslots included in the slot is the same, if the number of symbols included in the subslots is different, the arrangement of subslots in the slot may be different.

For example, in Table 2, the sub-slot pattern may be defined based on the start symbol of the sub-slot, and in Table 3, the sub-slot pattern may be defined based on the number of symbols included in the sub-slot. In Table 3, when the "number of FL symbols + UL symbols" included in the slot is less than 14, the number of sub-slots may be counted from the end point of the slot to the start point. In this case, the start symbol of subslot 1 may not be symbol 0 of the slot. The start point may mean a start timing.

In Table 3, when the "number of DL symbols + number of FL symbols" included in the slot is less than 14, the number of sub-slots may be counted from the start point of the slot to the end point. In this case, the end symbol of subslot L may not be symbol 13 of the slot. Even when the number of subslots is the same in Tables 2 and 3, the number of symbols included in each of the subslots may be different. The base station may inform the terminal of the index of the subslot pattern to reduce signaling overhead of the subslot pattern.

In Tables 2 and 3, indices 2, 3, and 4 may indicate different sub-slot patterns. In the subslot pattern indicated by index 2, the number of symbols included in subslots 3-4 may be greater than the number of symbols included in other subslots. In this case, the number of DL data channel candidates to be mapped to subslots 3-4 may be greater than the number of DL data channel candidates to be mapped to subslots 1-2. The number of HARQ responses in subslot 3-4 may be greater than the number of HARQ responses in subslot 1-2, and when the UL control channel uses the same bandwidth, the length of the UL control channel corresponding to subslot 3-4 May be longer than the length of the UL control channel corresponding to subslot 1-2.

In the subslot pattern indicated by index 3 of Tables 2 and 3, the number of symbols included in subslots 1-2 may be greater than the number of symbols included in other subslots. In this case, the number of DL data channel candidates to be mapped to subslot 1-2 may be greater than the number of DL data channel candidates to be mapped to subslot 3-4. A time required for feedback of the HARQ response may be secured in subslots 3-4.

In the subslot pattern indicated by index 4 in Tables 2 and 3, the number of symbols included in subslots 2 and 4 may be greater than the number of symbols included in other subslots. In this case, the sub-slot pattern may have a symmetrical characteristic. When the subcarrier spacing of the DL data channel (eg, 15 kHz or 30 kHz) is different from the subcarrier spacing of the UL control channel (eg, 30 kHz or 60 kHz), in order to indicate a time unit for feedback of the HARQ response, It is preferable that the boundary of the sub slot belongs to the boundary of the symbol.

The number of symbols included in the slot may vary depending on the subcarrier interval as well as the type of cyclic prefix (CP) (eg, normal CP or extended CP). When a general CP is used, the number of symbols included in the slot may be 14. When the extended CP is used, the number of symbols included in the slot may be 12. In this case, the corresponding sub-slot pattern may be derived from the sub-slot pattern for the reference BWP. Alternatively, indexes indicating the subslot pattern to which the extended CP is applied may be additionally defined.

In the subslot pattern indicated by index 5 in Tables 2 and 3, the number of symbols included in subslot 1 may be greater than the number of symbols included in other subslots. In this case, in the allocation procedure of DL data channels, the processing time of the terminal may be secured based on the last symbol of the DL data channel and the start symbol of the UL control channel for feedback of the HARQ response for the corresponding DL data channel.

The last symbol of the TDRA may generally be located in a rear area rather than a front area of the slot. In this case, the number of DL data channels corresponding to the subslot for feedback of the HARQ response may be large in the subslot located in the rear region of the slot. In this case, the size of the HARQ response (eg, the number of bits) included in the UL control channel may be asymmetric, and the reception quality of the HARQ response at the base station may vary according to the TDRA. To solve this problem, the number of symbols belonging to subslot 1 may be increased. Alternatively, the length of symbols belonging to subslot 1 may be increased.

In the subslot pattern indicated by index 6 of Tables 2 and 3, four subslots may be set in one slot. "L ₁ +L ₂ "may be the same as "L ₃ +L ₄ ". That is, each of "L ₁ +L ₂ "and "L ₃ +L ₄ " may be 7. This means that BWPs having different subcarrier spacings (e.g., BWPs having a subcarrier spacing of 15 kHz and BWPs having a subcarrier spacing of 30 kHz, or BWPs having a subcarrier spacing of 30 kHz and BWPs having a subcarrier spacing of 60 kHz) are in the frequency domain or time domain. Because it can be multiplexed. The boundary of the sub-slot(s) may be set to the boundary of half of the slot.

In the subslot pattern indicated by index 7 in Tables 2 and 3, 7 subslots may be set in one slot. Each of the 7 subslots may include 2 symbols.

In the proposed method, the DL subslot pattern may be set the same as the UL subslot pattern. Alternatively, the DL subslot pattern may be set independently from the UL subslot pattern. For example, the DL subslot pattern may be different from the UL subslot pattern.

20 is a conceptual diagram showing a seventh embodiment of a pattern of a subslot in a communication system.

Referring to FIG. 20, a subslot pattern may be defined, a DL subslot composed of a DL symbol and an FL symbol may be configured based on the subslot pattern, and UL symbols and FL symbols may be used based on the subslot pattern. A configured UL sub-slot may be configured. When a subslot pattern according to the numerology of the reference BWP is defined, the subslot pattern can be applied to both the DL subslot and the UL subslot.

For example, slot n may include 4 sub slots. The base station may inform the UE of the subslot pattern through a combination of one or more of higher layer signaling, MAC CE, and DCI irrespective of transmission of a DL data channel or a UL control channel. The sub slot pattern can be applied to a communication system supporting the FDD scheme. The DL subslot pattern applied to the DL slot may be the same as the UL subslot pattern applied to the UL slot. This pattern can be preferably applied in a system operating with FDD. That is, the pattern of the DL subslot applied to the DL slot may be the same as the pattern of the UL subslot applied to the UL slot.

However, in a communication system supporting the TDD scheme, the DL subslot pattern applied to the DL data channel may be set differently from the UL subslot pattern applied to the UL control channel. This is because the DL data channel candidates and the UL control channel candidates may be valid only in a specific sub-slot. When a HARQ response codebook having a semi-fixed size is used, the size of the HARQ response codebook depends on the number of TDRA indexes, a slot offset (or subslot offset) of the HARQ response, and the format of the slot to which the DL data channel is allocated. May not be uniform.

In the proposed method, the slot offset (or subslot offset) for the HARQ response may be calculated based on the last UL subslot among UL subslots located at the same time point as the DL subslot to which the DL data channel belongs. The base station may inform the terminal of the slot offset (or subslot offset) for the HARQ response through a combination of one or more of higher layer signaling, MAC CE, and DCI.

Referring back to FIG. 18, the FL symbol may be included in the DL subslot and/or the UL subslot. A specific DL data channel (e.g., a DL data channel corresponding to TDRA index 7) may belong to DL subslot 2, and the time point of DL subslot 2 (eg, start time) is the time point of UL subslot 0 It may be the same as (for example, starting point). When a slot includes many FL symbols, some DL subslots may be located behind UL subslots. In this case, a reference sub-slot for calculating a slot offset (or sub-slot offset) for the HARQ response may be required.

21 is a conceptual diagram showing an eighth embodiment of a pattern of a subslot in a communication system.

Referring to FIG. 21, a reference DL subslot may be a DL subslot to which a DL data channel is allocated, and a reference UL subslot may be derived from a reference DL subslot. "When the length of the DL subslot is different from the length of the UL subslot" or "When the starting time of the DL subslot is different from the starting time of the UL subslot", the reference DL subslot may correspond to a plurality of UL subslots. have. In this case, the slot offset (or subslot offset) for the HARQ response may be determined based on the last UL subslot among a plurality of UL subslots. Time resources for feedback of the HARQ response to the PDSCH may be determined based on UL subslot x+1. That is, the UL subslot x+1 may be a reference UL subslot. When the slot offset or subslot offset set by the base station is K, the UE may transmit a UL control channel or a UL data channel including a HARQ response in UL subslot x+1+K.

When one sub-slot pattern is configured regardless of the DL sub-slot and UL sub-slot, the time resource for feedback of the HARQ response may be derived based on the sub-slot to which the DL data channel belongs.

In the proposed method, UCI Piggyback The point of (piggyback) PUSCH Some or To the instance It can be limited.

The HARQ response codebook may correspond to resources of one PUCCH on a one-to-one basis. The priority of the HARQ response codebook may be the same as the priority of the PDSCH. The HARQ response codebook may be generated in consideration of PDSCHs having the same priority. For example, when a PDSCH is dynamically allocated and a HARQ response codebook for URLLC PDSCH (or eMBB PDSCH) is transmitted through PUSCH or PUCCH, the priority of the HARQ response codebook (or PDSCH) is URLLC (or eMBB ) Can be considered a priority. The URLLC PDSCH may be a PDSCH transmitted according to requirements of the URLLC service. The eMBB PDSCH may be a PDSCH transmitted according to requirements of the eMBB service.

When the feedback resource of the HARQ response (eg, URLLC PUCCH) for the URLLC PDSCH overlaps the URLLC PUSCH in the time domain, the HARQ response may be transmitted by being multiplexed with the URLLC PUSCH. When the URLLC PUCCH is set in a subslot and the URLLC PUSCH is set in a time interval longer than the subslot, the URLLC PUSCH may overlap with two or more URLLC PUCCHs. When the HARQ response codebook is generated on a slot basis, if the PUSCH overlaps with one PUCCH in the time domain, the UCI may be multiplexed in the PUSCH. This method cannot be applied when the HARQ response codebook is generated on a sub-slot basis.

In the proposed method, the HARQ response codebooks corresponding to two or more subslots are the order of the subslots (for example, "the order of PDSCHs related to the HARQ response codebook" or "the order of PDCCHs scheduling PDSCHs related to the HARQ response codebook" ), and the concatenated HARQ response codebooks may be a HARQ response bit sequence The HARQ response bit sequence may be mapped to a PUSCH Here, a PDSCH associated with the HARQ response codebook and a PDSCH associated with the HARQ response codebook are scheduled. The PDCCH may be set in units of subslots, and the PUSCH to which the HARQ response bit sequence is mapped may be set in units of slots including two or more subslots The base station can know in advance the HARQ response bit sequence to be generated by the UE. Therefore, the base station determines one or more of the size of the UL-SCH (uplink-shared channel), the size of the aperiodic CSI, and the resource size of the PUSCH in consideration of the size of the HARQ response bit sequence (or the number of the HARQ response bit sequence). The base station may transmit a UL grant indicating one or more of the size of the UL-SCH, the size of the aperiodic CSI, and the size of the PUSCH resource to the UE. The UE may receive the UL grant from the base station. And, it is possible to check the DAI and beta offset used for UCI multiplexing from the UL grant.

22 is a conceptual diagram showing a first embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 22, one PUSCH may be transmitted through two or more subslots. In this case, the UE may configure two HARQ response codebooks into one HARQ response bit sequence, and may multiplex the HARQ response bit sequence with the PUSCH.

The HARQ response codebook 1 may be encoded at the same time as the HARQ response codebook 2 generated after the HARQ response codebook 1. Therefore, the terminal must quickly decode the PDSCH corresponding to the HARQ response codebook 2. In order to support the encoding operation of the HARQ response codebook 1-2 at the same time as the fast decoding operation of the PDSCH corresponding to the HARQ response codebook 2, the base station may perform a scheduling operation for the PDSCH and the PUSCH. When the PUSCH is transmitted according to the frequency hopping scheme, the HARQ response bit sequence may be multiplexed for each hop of the PUSCH. Accordingly, the base station may perform a decoding operation on the HARQ response bit sequence after receiving the PUSCH (eg, part of the PUSCH) in the second hop.

Meanwhile, when a lot of time is required for the decoding operation of the PDSCH, it may be difficult to simultaneously schedule the PDSCH and the PUSCH. Therefore, instead of making HARQ response codebooks into one HARQ response bit sequence, each HARQ response codebook may be multiplexed with a PUSCH in a time resource adjacent to a subslot in which the corresponding HARQ response codebook is to be transmitted. For example, the HARQ response codebook 1 may be multiplexed in radio resources overlapping or adjacent to the PUCCH associated with the HARQ response codebook 1 among radio resources occupied by the PUSCH. The HARQ response codebook 2 may be multiplexed in radio resources overlapping or adjacent to the PUCCH associated with the HARQ response codebook 2 among radio resources occupied by the PUSCH.

23 is a conceptual diagram showing a second embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 23, when the PUSCH is transmitted in a frequency hopping scheme, the HARQ response codebook may be multiplexed with the PUSCH in units of frequency hops. When the PUSCH belongs to a different subslot for each frequency hop, the HARQ response codebook may be mapped differently for each frequency hop. In this case, the HARQ response codebook 1 may be multiplexed on the PUSCH of the first hop, and the HARQ response codebook 2 may be multiplexed on the PUSCH of the second hop. When two or more HARQ response codebooks are multiplexed in the PUSCH of one hop, the UE concatenates the HARQ response codebooks based on the order of subslots (eg, subslots associated with the HARQ response codebook) to obtain a HARQ response bit sequence. Can be generated. The UE may multiplex the HARQ response bit stream in the PUSCH of one hop.

■ Multi-RxP (reception point)

In a communication scenario in which a UE transmits a PUSCH using different RxPs, a PUSCH occasion may be set. One PUSCH occasion may be indicated by one UL grant. PUSCH occasions may be PUSCH instances concatenated in the time domain. In the following embodiments, a PUSCH instance may mean "PUSCH repetition". TB and a demodulation-reference signal (DM-RS) may be mapped to a PUSCH instance. The same TB can be mapped to PUSCH instances. Alternatively, different TBs may be mapped to each of the PUSCH instances. When the same TB is mapped to PUSCH instances, a redundancy version (RV) may be set differently for each PUSCH instance.

In this case, the base station may instruct the terminal to perform a PUCCH transmission operation. In the proposed method, each of the PUSCH instances may be regarded as independent UL transmission, and UCI may be multiplexed in each of the PUSCH instances. When the mini-slot(s) through which the PUSCH instance is transmitted belongs to a specific sub-slot(s), UCI may be multiplexed in the corresponding PUSCH instance.

24 is a conceptual diagram illustrating a third embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 24, one PUSCH occasion may include four PUSCH instances. UCI may be multiplexed in PUSCH instance 1 and PUSCH instance 3. HARQ response codebook 1 may be multiplexed in PUSCH instance 1, and HARQ response codebook 2 may be multiplexed in PUSCH instance 3.

The PUCCH to which the HARQ response codebook 2 is to be transmitted may overlap with PUSCH instances 3-4 in the time domain. Since PUSCH instance 3 is temporally located first among PUSCH instances 3-4 overlapping with PUCCH, the UE may multiplex HARQ response codebook 2 in PUSCH instance 3. When the frequency hopping scheme is applied to the PUSCH instance, UCI (eg, HARQ response codebook) may be multiplexed in the corresponding frequency hop. Alternatively, UCI (eg, HARQ response codebook) may be multiplexed regardless of frequency hopping.

In the proposed method, the criterion of a processing time for UCI multiplexing may be the first symbol of a PUSCH (eg, a PUSCH multiplexed with UCI). The UE may transmit the PUSCH using only information included in the UL grant. Accordingly, the UE may generate a PUSCH based on the size of the UL-SCH/CSI indicated by the UL grant without considering the slot format and/or the UCI multiplexing operation.

When UCI is multiplexed in the PUSCH, it may be assumed that the UE does not receive DL allocation information (eg, DAI) after receiving the UL grant. The UE may estimate the size of the UCI based on the field included in the UL grant, and may perform a puncturing operation or a rate matching operation for the UL-SCH based on the size of the UCI. .

In order for UCI to be multiplexed with the PUSCH, a sufficient processing time of the terminal must be secured. When UCI is the HARQ response, the interval between the last symbol of the PDSCH and the start symbol of the PUSCH dynamically allocated by DCI is proportional to the number of predefined symbols (eg, N ₁ +d _1,1 +1). It may be longer than a time interval. The interval between the last symbol of the SPS PDSCH and the start symbol of the PUSCH that is semi-fixedly allocated may be more than a time interval proportional to the number of predefined symbols (eg, N+1).

The interval between the last symbol of the PDSCH and the start symbol of the PUSCH (eg, UL-SCH) dynamically allocated by the DCI is determined by the number of predefined symbols (eg, N ₂ +d _2,1 +1). It may be more than a proportional time interval. The interval between the last symbol of the PDSCH and the start symbol of the PUSCH (eg, CSI) dynamically allocated by DCI may be greater than or equal to a time interval proportional to the number of predefined symbols (eg, Z+d).

N, N ₁ , N ₂ , d _1,1 , and d _2,1 may be defined in the 3GPP technical standard. The base station may inform the terminal of N, N ₁ , N ₂ , d _1,1 , and d _2,1 through a combination of one or more of higher layer signaling, MAC CE, and DCI. In the above-described embodiments, the time required to generate the PUSCH may be as follows. The UCI processing operation of the terminal before the required time can be distinguished from the UCI processing operation of the terminal after the necessary time.

25 is a conceptual diagram illustrating a fourth embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 25, PUSCH transmission may be performed without frequency hopping, and one PUSCH may overlap a plurality of PUCCHs. In this case, the HARQ response codebook 1-2 may be multiplexed in the PUSCH. The time budget may be a time required by the terminal for UCI processing (eg, UCI transmission).

26 is a conceptual diagram illustrating a fifth embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 26, PUSCH transmission may be performed based on a frequency hopping scheme, and PUSCH may overlap with PUCCH. In this case, the HARQ response codebook 1 may be multiplexed on the PUSCH of the first hop, and the HARQ response codebook 2 may be multiplexed on the PUSCH of the second hop. Time budget 1 may be a time required by the terminal for processing UCI 1 (eg, HARQ response codebook 1), and time budget 2 is a time required by the terminal for processing UCI 2 (eg, HARQ response codebook 2) Can be

27 is a conceptual diagram illustrating a sixth embodiment of a method for feedback of a HARQ response in a communication system.

Referring to FIG. 27, one PUSCH occasion may include four PUSCH instances. HARQ response codebook 1 may be multiplexed in PUSCH instance 1, and HARQ response codebook 2 may be multiplexed in PUSCH instance 3. Time budget 1 may be a time required by the terminal for processing UCI 1 (eg, HARQ response codebook 1), and time budget 2 is a time required by the terminal for processing UCI 2 (eg, HARQ response codebook 2) Can be

In order to apply the above-described methods, the start symbol of the PUSCH and the last symbol of the PDSCH interpreted by the UE must be different. For example, the UE may calculate a processing time (eg, a time budget) based on a frequency hop or a PUSCH instance of a PUSCH multiplexed with UCI. In the embodiment shown in FIG. 26, the processing time (eg, time budget) may be calculated based on the frequency hop of the PUSCH in units of one HARQ response codebook. In the embodiment shown in FIG. 27, the processing time (eg, time budget) may be calculated based on the PUSCH instance in units of one HARQ response codebook. These methods are different from the method of calculating the processing time based on the first symbol of the PUSCH.

In the embodiments shown in FIGS. 25 to 27, since the criteria for calculating the processing time (eg, time budget) (eg, frequency hop or PUSCH instance) are different, the generation time of UCI multiplexed in the PUSCH is also shown. can be changed. For example, the last symbol of the PDSCH may be located before the time budget from the first symbol of the PUSCH multiplexed with UCI. In the embodiments shown in FIGS. 25 to 27, the UL grant is received after the DL allocation information, but the UL grant may be received before the DL allocation information.

In the proposed method, when the terminal runs out of processing time or when DL allocation information is received after the UL grant, the terminal may select one UL channel and then transmit UCI on the selected UL channel.

The priority of the UL-SCH may be different from the priority of the DL-SCH. The priority of the DL-SCH/UL-SCH can be dynamically indicated. Alternatively, the priority of the DL-SCH/UL-SCH may be indicated by higher layer signaling. The priority of the DL-SCH/UL-SCH may be dynamically indicated by the PDCCH (eg, DCI) or RNTI that allocates the DL-SCH/UL-SCH. The priority of the DL-SCH may be the priority of the PDSCH, and the priority of the UL-SCH may be the priority of the PUSCH.

The UE may check the priority of the DL-SCH/UL-SCH based on the discovery space in which the PDCCH is detected or a control resource set (CORESET). The UE may check the priority of the DL-SCH/UL-SCH based on a specific field of DCI. The UE may check the priority of the DL-SCH/UL-SCH based on the characteristics of the PDCCH (eg, DCI format, DCI size). Two or more priorities can be defined. When two priorities are defined, the two priorities may be referred to as a low priority and a high priority.

The above-described UCI (eg, HARQ response, CSI) and PUSCH multiplexing method may be applied when the priority of UCI (eg, DL-SCH associated with UCI) is the same as the priority of UL-SCH. When the priority of the DL-SCH is lower than the priority of the UL-SCH, the HARQ response for the DL-SCH may not be multiplexed in the UL-SCH. Regardless of the DL allocation information and the reception time of the UL grant, the UCI multiplexing operation may not be performed when the priority of the DL-SCH associated with the UCI is different from the priority of the UL-SCH. When the priority of the DL-SCH is lower than the priority of the UL-SCH, the UE may transmit the PUSCH according to the UL grant, and the HARQ response may not be multiplexed in the corresponding PUSCH. When the PUCCH overlaps the PUSCH in the time domain, the PUCCH may not be transmitted. In this case, since the HARQ response is not received from the terminal, the base station may retransmit the DL-SCH using new DL allocation information.

When the priority of the DL-SCH is higher than the priority of the UL-SCH, the UE may transmit a PUCCH including a HARQ response related to the DL-SCH. Regardless of the DL allocation information and the reception time of the UL grant, the UCI multiplexing operation may not be performed when the priority of the DL-SCH associated with the UCI is different from the priority of the UL-SCH. Accordingly, the UE can transmit the PUCCH based on the DL allocation information. When the PUCCH overlaps the PUSCH in the time domain, the PUSCH may not be transmitted. In this case, since the PUSCH is not received from the terminal, the base station may trigger a retransmission operation of the UL-SCH using a new UL grant.

When the priority of the DL-SCH is the same as the priority of the UL-SCH and the processing time (eg, time budget) is satisfied in the terminal, the UCI associated with the DL-SCH may be multiplexed with the UL-SCH. However, the base station cannot request transmission of the HARQ response for the DL-SCH after allocating the transmission resource of the UL-SCH to the terminal. Therefore, the scheduling operation of the DL-SCH may be limited. In order to support URLLC services, these restrictions need to be relaxed.

The base station may transmit DL allocation information for the PDSCH associated with the HARQ response to the terminal so that the PUCCH for feedback of the HARQ response does not overlap with the PUSCH. Alternatively, the PDSCH allocation timing (eg, allocation timing) may be delayed. Since the transmission of the DL-SCH is delayed according to these operations, the requirements of the URLLC service may not be satisfied.

The operation of generating the PUSCH based on information indicated after the UL grant may be difficult to be implemented in the terminal. Therefore, methods that satisfy the following conditions are needed.

-Condition 1: Easy to implement in terminal

-Condition 2: UE can generate PUSCH with only UL grant

-Condition 3: Base station can perform flexible scheduling operation for PDSCH

In the proposed method, it may be allowed that the transmission time of the UL grant is changed from the transmission time of the DL allocation information. When the priority of the DL-SCH is the same as the priority of the UL-SCH, the UE may perform communication based on the DL allocation information received after the UL grant. For example, the terminal may receive the UL grant, and may receive DL allocation information after the UL grant. When the PUCCH associated with the DL allocation information overlaps the PUSCH indicated by the UL grant in the time domain, the UE may transmit the PUCCH or PUSCH to the base station. Therefore, there may be no restriction on transmission of DL allocation information in the base station.

In the proposed method, the UE may select UL channel(s) before the last UL channel among a plurality of UL channels, and may perform uplink communication using the selected UL channel(s). That is, the terminal may not use the last UL channel. The UE may compare the position of the first symbol in the resources to which the DL allocation information for PDSCH allocation is mapped and the positions of the first symbols in the resources to which the UL grant for PUSCH allocation is mapped, and based on the comparison result, the UL channel Among them (eg, PUCCH and PUSCH related to PDSCH), a UL channel may be temporally selected in advance. The UL channel selected by the UE may be PUCCH or PUSCH.

28 is a conceptual diagram showing a seventh embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 28, a base station may transmit a UL grant after transmitting DL allocation information for a PDSCH. The terminal may receive DL allocation information from the base station and may receive a PDSCH based on the DL allocation information. In addition, the UE may receive the UL grant from the base station and may check the PUSCH indicated by the UL grant. Here, the PUCCH to which the HARQ response for the PDSCH is to be transmitted may overlap the PUSCH in the time domain. If the UL grant is received before the PDSCH, the UE may multiplex the HARQ response for the PDSCH with the PUSCH.

29 is a conceptual diagram illustrating an eighth embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 29, a base station may transmit a UL grant after transmitting DL allocation information for a PDSCH. The terminal may receive DL allocation information from the base station and may receive a PDSCH based on the DL allocation information. In addition, the UE may receive the UL grant from the base station and may check the PUSCH indicated by the UL grant. Here, the PUCCH to which the HARQ response for the PDSCH is to be transmitted may overlap the PUSCH in the time domain. When the DL allocation information is received before the UL grant, the UE may drop PUSCH transmission scheduled by the UL grant, and may transmit a PUCCH including a HARQ response to the PDSCH to the base station.

30 is a conceptual diagram illustrating a ninth embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 30, the base station may transmit DL allocation information for a PDSCH after transmitting a UL grant. The UE may receive the UL grant from the base station and may check the PUSCH indicated by the UL grant. In addition, the UE may receive DL allocation information from the base station and may receive a PDSCH based on the DL allocation information. Here, the PUCCH to which the HARQ response for the PDSCH is to be transmitted may overlap the PUSCH in the time domain. When the UL grant is received before the DL allocation information, the UE may transmit a PUSCH scheduled by the UL grant and may drop PUCCH transmission. The HARQ response for the PDSCH may be multiplexed on the PUSCH.

Here, the base station can know in advance that the UE does not transmit the PUCCH including the HARQ response to the PDSCH. In this case, since the UE performs a decoding operation on the PDSCH (eg, DL-SCH), the base station transmits DL allocation information that triggers retransmission of the PDSCH, the UE transmits the DL-SCH (eg, It can be predicted that the error rate of PDSCH) decreases.

In another proposed method, the terminal may transmit the last UL channel among the plurality of UL channels, and the transmission of the UL channel before the last UL channel among the plurality of UL channels may be canceled.

The UE may compare the position of the first symbol in the resources to which the DL allocation information for PDSCH allocation is mapped and the positions of the first symbols in the resources to which the UL grant for PUSCH allocation is mapped, and based on the comparison result, the UL channel Among them (eg, PUCCH and PUSCH related to PDSCH), the last UL channel in the time domain may be selected. The UL channel selected by the UE may be PUCCH or PUSCH.

The UL channel allocated by the base station may be a UL channel that must be urgently transmitted. Therefore, according to the proposed method, the terminal can transmit the last UL channel in the time domain. Transmission of the UL channel before the last UL channel in the time domain may be canceled.

31 is a conceptual diagram showing a tenth embodiment of a feedback method of a HARQ response in a communication system.

Referring to FIG. 31, the base station may transmit DL allocation information for a PDSCH after transmitting a UL grant. The UE may receive the UL grant from the base station and may check the PUSCH indicated by the UL grant. In addition, the UE may receive DL allocation information from the base station and may receive a PDSCH based on the DL allocation information. Here, the PUCCH to which the HARQ response for the PDSCH is to be transmitted may overlap the PUSCH in the time domain. When the UL grant is received before the DL allocation information, the UE may transmit a PUCCH including a HARQ response for a PDSCH scheduled by the DL allocation information. That is, transmission of the PUSCH scheduled by the UL grant may be dropped.

32 is a conceptual diagram illustrating an eleventh embodiment of a method for feedback of a HARQ response in a communication system.

Referring to FIG. 32, a base station may transmit a UL grant after transmitting DL allocation information for a PDSCH. The terminal may receive DL allocation information from the base station and may receive a PDSCH based on the DL allocation information. In addition, the UE may receive the UL grant from the base station and may check the PUSCH indicated by the UL grant. Here, the PUCCH to which the HARQ response for the PDSCH is to be transmitted may overlap the PUSCH in the time domain. If the DL allocation information is received before the UL grant, the UE may transmit a PUSCH scheduled by the UL grant. That is, transmission of the PUCCH including the HARQ response to the PDSCH scheduled by the DL allocation information may be dropped. The HARQ response for the PDSCH may be multiplexed on the PUSCH.

If the PUSCH is allocated after the PUCCH is allocated, the UE may not transmit the PUCCH and may transmit the PUSCH. When the HARQ response for the PDSCH is not received from the terminal, the base station cannot confirm whether the PDSCH was successfully received from the terminal. Therefore, the base station may regard the case where the HARQ response for the PDSCH is not received as the case where the NACK is received, and may retransmit the DL allocation information for the PDSCH.

In the proposed method, HARQ Response codebooks are different RxP Can be created in consideration.

The terminal may generate a HARQ response codebook based on the 3GPP technical standard. The base station may transmit DL-DCIs indicating transmission of PUCCHs in the same time resources to the terminal. The DL-DCI may include scheduling information of the PDSCH. The DL-DCI can be distinguished from the UL-DCI including the UL grant.

The terminal may receive DL-DCIs from the base station and may arrange HARQ response bits based on the reception order of the DL-DCIs. The terminal may generate a HARQ response codebook by concatenating HARQ response bits.

One HARQ response codebook may include HARQ response bits to be transmitted through the PUCCH of the same subslot. One HARQ response codebook may have a bitmap form. The HARQ response codebook may correspond to the subslot on a one-to-one basis.

PUCCHs corresponding to the HARQ response codebook may have the same transmission configuration indicator (TCI) or the same scheduling request indicator (SRI). Alternatively, PUCCHs corresponding to the HARQ response codebook may have different TCIs or different SRIs. TCI can be used for UL transmission as well as DL transmission. TCI may mean information of preprocessing and/or beamforming for transmission (eg, DL transmission, UL transmission). SRI may mean a sounding reference signal (SRS) indicator. TCI can be used interchangeably with SRI. Alternatively, other terms may be used instead of TCI and SRI.

The terminal may assume that HARQ response codebooks having the same TCI (or SRI) are received from the same RxP (eg, base station). The UE may assume that HARQ response codebooks having different TCIs (or SRIs) are received from different RxPs (eg, base stations). The TCI may be obtained from the configuration information of the CORESET in which the DL-DCI scheduling the PDSCH is received. The base station may transmit the setting information of CORESET to the terminal using higher layer signaling. The setting information of CORESET may include one or more of TCI, SRI used for PUCCH transmission, and information indicating a preprocessing method. Accordingly, the PUCCH may have a TCI of CORESET associated with the corresponding PUCCH.

The base station may perform a scheduling operation on the PDSCH so that PUCCHs having the same TCI are located in the same subslot. Placing RxPs in order may be the same as placing CORESET indexes in order. When only one sub-slot exists, the algorithm defined in Table 4 below may be used.

When the reception time of DL-DCI 1 is earlier than the reception time of DL-DCI 2, the HARQ response bit associated with DL-DCI 1 in the HARQ response codebook may be located before the HARQ response bit associated with DL-DCI 2. If there are two or more sub-slots, the following methods may be considered.

In the proposed method, the sub-slot can be considered first, and the RxP can be considered later. The terminal may generate a HARQ response codebook based on the 3GPP technical standard. The UE may receive DL-DCIs indicating that PUCCHs are transmitted on the same time resources, and may arrange HARQ response bits based on the order of reception of the DL-DCIs. The UE may generate a HARQ response codebook by concatenating HARQ response bits according to the order of the serving cell.

When PUCCHs corresponding to the HARQ response codebook have the same TCI, the UE may generate the HARQ response bit stream A by concatenating the HARQ response codebooks in the order of subslots. The UE may generate the HARQ response bit stream B by concatenating the HARQ response bit streams A in the order of the serving cell. The UE may map the HARQ response bit stream B to the PUSCH or PUCCH.

When PUCCHs corresponding to the HARQ response codebook have different TCIs, the HARQ response codebooks may not be concatenated regardless of the subslot. The terminal may generate the HARQ response bit stream A by concatenating the HARQ response codebooks in the order of the serving cell. The terminal may generate the HARQ response bit string B by concatenating the HARQ response bit strings A in the order of TCI (eg, in the order of CORESET). HARQ response bit stream B may be mapped to PUSCH or PUCCH.

When the above-described procedure is used, the terminal may generate a HARQ response codebook by arranging HARQ responses fed back in the same subslot. Thereafter, the UE may generate a HARQ response bit stream A by concatenating HARQ response codebooks having the same TCI in the order of subslots. Thereafter, the UE may generate the HARQ response bit stream B by concatenating the HARQ response bit streams A in the order of the serving cell. Thereafter, the terminal may generate the HARQ response bit string C by concatenating the HARQ response bit strings B in the order of CORESET. Thereafter, the UE may map the HARQ response bit stream C to the PUSCH or PUCCH. This procedure can be performed based on the algorithm defined in Table 5 below.

In the proposed method, the temporal order may be considered first, then the frequency order may be considered, and finally the RxP order may be considered. The terminal may generate the HARQ response codebook in consideration of the time order and frequency order. When RxP is additionally considered in the process of generating the HARQ response codebook, the HARQ response codebooks may be concatenated in the order of CORESET.

The HARQ response bit string A may be generated according to an extended concept based on a time order. For example, the order of the PDSCH may be determined by the reception order of the DL-DCI scheduling the corresponding PDSCH. Here, the DL-DCI may be limited to DL-DCI indicating the transmission time of the same PUCCH. The UE may generate the HARQ response bit stream B by concatenating the HARQ response bit streams A according to the transmission order of the PUCCH (eg, the order of subslots). Thereafter, the UE may generate the HARQ response bit stream C by concatenating the HARQ response bit streams B according to the order of the serving cells. Thereafter, the terminal may generate the HARQ response bit string D by concatenating the HARQ response bit strings C according to the order of CORESET. The HARQ response bit stream D may be multiplexed in PUCCH or PUSCH. This procedure can be performed based on the algorithm defined in Table 6 below.

According to the proposed method, since the last concatenation operation is performed according to the CORESET order, when different PUCCHs are transmitted to different RxPs in a communication scenario using a plurality of RxPs, each of the PUCCHs may have a different TCI. .

When the last concatenation operation is not defined in the proposed method, a necessary HARQ response bit sequence may be obtained. When all HARQ response bits are to be transmitted through one PUCCH or PUSCH, necessary HARQ response bit sequences may be obtained by performing the last concatenation operation.

In the proposed method, RxP The order may be considered first, and then the order of the sub slots may be considered.

The terminal may generate a HARQ response codebook based on the 3GPP technical standard. The terminal may generate a HARQ response codebook by concatenating the HARQ response bits according to the order of reception points of the DL-DCIs, and may generate a HARQ response bit sequence by concatenating the HARQ response codebooks according to the order of the serving cell.

Since PUCCHs corresponding to the HARQ response codebook may have different TCIs, the HARQ response codebook may be transmitted on different PUCCHs. HARQ response codebooks may be generated by arranging HARQ responses for PDSCHs related to PUCCHs to be transmitted in the same subslot according to a predefined order.

Thereafter, the UE may generate HARQ response bit streams A by concatenating HARQ response codebooks in the order of the serving cell. Thereafter, the terminal may generate HARQ response bit streams B by concatenating HARQ response bit streams A in the order of CORESET. Thereafter, the UE may generate the HARQ response bit stream C by concatenating the HARQ response bit streams B in the order of subslots. The HARQ response bit stream C may be transmitted in PUCCH or PUSCH. This procedure can be performed based on the algorithm defined in Table 7 below.

According to the proposed method, the last concatenation operation may be performed according to the order of subslots. In order to quickly perform the feedback operation, one HARQ response bit stream may include HARQ responses to be transmitted to different RxPs. In order to support transmission of the HARQ response for the URLLC PDSCH, the PUCCH may be transmitted on a subslot basis, and the HARQ response may be multiplexed on the PUSCH on a subslot basis.

When the last concatenation operation is not defined in the proposed method, the required HARQ response bit sequence may be transmitted through PUCCH or PUSCH in units of subslots. When the delay time required in the HARQ response transmission procedure is satisfied, the required HARQ response bit sequence may be obtained by performing the last concatenation operation.

■ How to generate CSI report considering different RxPs

The priority of RxP may be considered in the CSI reporting procedure. CSI reporting can be triggered by DCI. Alternatively, CSI reporting can be activated semi-persistent. Depending on the triggering method (eg, activation method) of the CSI report, the CSI report may be classified into a periodic CSI report, a semi-persistent CSI report, and a triggered CSI report. Transmission of the CSI report may be indicated by one transmission point (TxP) (eg, a base station), and the terminal may transmit a CSI report for one TxP to an RxP (eg, a base station). When two or more DL carriers are configured and two or more DL carriers are activated, the UE may generate a CSI report for some or all of the DL BWPs. CSI report may be mapped to PUCCH or PUSCH.

When there are many DL BWPs, all CSI reports may not be transmitted through the PUCCH or PUSCH configured in the terminal. The reason is that the terminal cannot transmit the encoded CSI report through resources set by the base station. In this case, the UE may transmit some CSI reports according to priority (eg, priority defined in the 3GPP technical standard) among all CSI reports, and may not transmit the remaining CSI reports.

In order to consider the CSI report for one or more TxPs and one or more RxPs receiving the CSI report, the priority of the CSI report defined in the 3GPP technical standard must be modified.

The base station may configure J PUCCH resources (eg, multi-CSI-PUCCH-Resource-List) to the terminal using higher layer signaling. J can be 1 or 2. When the UE intends to transmit a plurality of CSI reports through a PUCCH configured in one slot, the UE may select one of PUCCH resource 0 and PUCCH resource J-1. In a procedure for defining PUCCH resource 0 and PUCCH resource J-1, the base station may define PUCCH resources to increase the size of the PUCCH resource (eg, the number of REs × coding rate × modulation rate). Accordingly, PUCCH resource 1 may be greater than PUCCH resource 0.

"CSI report(s) + other UCI (eg, SR, HARQ response) + CRC" may be expressed as bits, and the corresponding bits may be encoded. When a codeword for “CSI report(s) + other UCI (eg, SR, HARQ response) + CRC” is transmittable in PUCCH resource 0, the UE may transmit the codeword using PUCCH resource 0. When the codeword for "CSI report(s) + other UCI (eg, SR, HARQ response) + CRC" is transmittable in PUCCH resource 1, the UE may transmit the codeword using PUCCH resource 1. If the codeword for “CSI report(s) + other UCI (eg, SR, HARQ response) + CRC” is not transmitted in PUCCH resources 0 and 1, the UE reports some CSI ( S) may not be transmitted. Alternatively, the UE may transmit CSI report(s) using PUSCH. The CSI report that is not transmitted may be determined based on an equation defined in the 3GPP technical standard.

The priority of each of the CSI reports may be determined by the following function. y may indicate a CSI report method (eg, periodic CSI report, semi-fixed CSI report, or triggered CSI report). k may indicate the type of CSI (eg, reference signal received power (L1-RSRP) or CSI other than L1-RSRP). c may be the index of the serving cell. s may be an index of CSI reporting.

A function for determining the priority of each of the CSI reports may be defined as in Equation 9 below.

N _cells may indicate the maximum number of serving cells and may be set by higher layer signaling. M _s may indicate the maximum number of CSI reports and may be set by higher layer signaling.

When the CSI report is an aperiodic CSI report transmitted on the PUSCH, y may be 0. When the CSI report is a semi-static CSI report transmitted on the PUSCH, y may be 1. When the CSI report is a semi-static CSI report transmitted on the PUCCH, y may be 2. When the CSI report is a periodic CSI report transmitted on the PUCCH, y may be 3. If the CSI report includes L1-RSRP, k may be 0. If the CSI report does not include L1-RSRP, k may be 1. The terminal may determine that the priority is higher as pri(y,k,c,s) is smaller.

The base station may instruct the terminal to transmit the CSI report through the PUSCH. Here, y may be set to 0 or 1. In this case, transmission of the two CSI reports may collide. When it is indicated to the UE that CSI reports are transmitted through PUSCHs, the PUSCHs may overlap in the time domain. In this case, the UE may transmit a CSI report having a high priority (eg, a CSI report having a low pri(y,k,c,s)) through a PUSCH associated with the CSI.

CSI report 1 is indicated to be transmitted through PUCCH (eg, when y is 2 or 3), and CSI report 2 is indicated to be transmitted through PUSCH (eg, when y is 0 or 1) ), if the PUCCH to which CSI report 1 is to be transmitted overlaps with the PUSCH to which CSI report 2 is to be transmitted in the time domain, the UE has a CSI report with a low priority (eg, high pri(y,k,c,s) CSI report having a) may not be transmitted.

When all CSI reports are transmitted through PUCCHs (e.g., when y is 2 or 3), and PUCCHs overlap in the time domain, the UE reports CSI with low priority (e.g., high pri (y CSI report with ,k,c,s)) may not be transmitted, and selected CSI report(s) may be multiplexed according to priority. The multiplexed CSI report(s) may be transmitted through PUCCH resource J-1.

In the proposed method, the priority of CSI reports for two or more transmission reception points (TRPs) may be determined according to the order (eg, priority) of two or more TRPs. The priority of CSI reporting for one TRP may be determined according to the 3GPP technical standard, and each of the TRPs may have a different offset. The priority of CSI reporting for a TRP having a high priority (eg, TRP A) may be higher than that of a CSI reporting for a TRP having a low priority (eg, TRP B). Since the priority of the most important CSI report among all CSI reports for TRP B is lower than the priority of certain CSI reports for TRP A, management of TRP B may be difficult.

In the proposed method, CSI reports having the same priority may be transmitted according to the order of TRP. CSI reports having different priorities may be transmitted according to the priority of the CSI report regardless of the order of the TRP. The priority of the CSI report may be defined according to the 3GPP technical standard regardless of the TRP index (eg, TRP A, TRP B).

When the priority of the CSI reports is determined according to a function (eg, Equation 9), and the indexes of the serving cells associated with the CSI reports are the same, the priority of the CSI reports may be calculated regardless of the priority of the TRP. have. Since the priority of the TRP is not related to the priority of the CSI report, when the indices of the serving cells associated with the CSI reports are different, the priority of the CSI reports may be determined based on the index of the serving cell regardless of the priority of the TRP. .

When the CSI reports have different priorities, the CSI reports may be transmitted according to the priority of the TRP. In the same serving cell, the priority of the CQI (channel quality indicator)/RI (rank indicator) report of each of TRP A and B may be determined based on the priority of the CQI/RI report, and each of TRP A and B L1- The priority of the RSRP report may be determined based on the priority of the L1-RSRP report. In the same serving cell, the relative priority between the CQI/RI report of TRP A and the L-RSRP report of TRP B is the priority of the CQI/RI report and the priority of the L1-RSRP report regardless of the priority between TRP A and TRP B. It may be determined based on the comparison result between the rankings. On the other hand, in the same serving cell, when the same CSI reports are performed by different TRPs (eg, TRP A and B), the priorities of the same CSI reports may be determined based on the priorities of different TRPs. .

In the proposed method, the priority of some CSI reports may be determined regardless of the priority of the TRP, and the priority of the remaining CSI reports may be determined according to the priority of the TRP. CSI reporting is L1-RSRP, CQI, PMI (precoding matrix indicator), CRI (CSI-RS (channel state information-reference signal resource indicator)), SSBRI (SS/PBCH (synchronization signal/physical broadcast channel) resource blcok indicator), It may include a combination of one or more of a layer indicator (LI) and an RI The type of CSI report may vary depending on information included in the CSI report The type of CSI report may be indicated by higher layer signaling.

For example, CSI reports include "CQI", "PMI", "CRI, RI, PMI, and a combination of CQI", "CRI, RI, LI, PMI, and a combination of CQI", "CRI, RI, and LI "A combination of", "a combination of CRI, RI, and CQI", "a combination of CRI, RI, L1, and CQI", "a combination of CRI and L1-RSRP", or "a combination of SSBRI and L1-RSRP". have. Alternatively, the CSI report may not contain any information.

In the conventional 3GPP technical standard, the types of CSI reports can be classified into a CSI report including L1-RSRP and a CSI report including information other than L1-RSRP. The priority of CSI reporting including L1-RSRP may be higher than that of CSI reporting including information other than L1-RSRP. Priorities of CSI reports including information other than L1-RSRP may be the same.

All TRPs can have priority. The priority of the TRP may correspond to the priority of the CSI report. In the procedure for determining the priority for the same CSI report trigger and the ordered pair (CSI report, TRP) of the same serving cell index, the priority of the CSI report including the L1-RSRP is L1 regardless of the priority of the TRP. -May be higher than the priority of the CSI report including information other than RSRP. On the other hand, the priority of the CSI report including other information may be determined according to the priority of the TRP.

Therefore, the value of k can be newly introduced. For example, k may reflect the priority of the TRP, and the priority of the CSI report may be determined based on the new k. If there are two TRPs, "K=2" can be introduced. "k=1" may be applied to a TRP having a high priority among TRPs, and "k=2" may be applied to a TRP having a lower priority among TRPs. In this case, the CSI report may include other information instead of L1-RSRP. "k=0" may be applied to CSI reporting including L1-RSRP regardless of TRP. Since there are three values of k, the value of y may be set based on the value of k. A function for determining the priority of each of the CSI reports may be defined as in Equation 10 below.

The above-described embodiment can be applied when the priorities of m TRPs are classified. Here, m may be a natural number. For example, a function for determining the priority of each of the CSI reports may be defined as in Equation 11 below.

In the proposed method, a semi-fixed size HARQ When DL data channel candidates overlap in the time domain in the response codebook generation procedure, one DL data channel candidate may be selected from among the DL data channel candidates.

When the size of the HARQ response codebook is semi-fixedly determined, the UE determines the HARQ response codebook from the feedback timing (eg, slot offset or subslot offset) of the HARQ response and the DL data channel candidate (eg, TDRA index). You can derive the size. In a communication system supporting TDD, the slot pattern may affect the size of the HARQ response codebook. The base station may inform the terminal of at least one of the feedback timing of the HARQ response, a list (or table) consisting of a TDRA index, and a slot pattern using higher layer signaling. The number of HARQ responses generated within a unit time (eg, one slot) may vary according to the processing capability of the terminal. For example, the UE may generate a HARQ response for one DL data channel or HARQ responses for two or more DL data channels within a unit time (eg, one slot).

The UE generates a HARQ response codebook for a HARQ response for a DL data channel and a HARQ response for a DL control channel indicating release of an SPS DL data channel (eg, a semi-fixedly allocated DL data channel). can do. When a DL control channel instructing release of the SPS DL data channel is received, the terminal may generate a HARQ response based on a resource receiving the SPS DL data channel.

When the slot format is set in the terminal by higher layer signaling, the terminal may not generate a HARQ response for a TDRA index indicating a UL symbol. The terminal may generate HARQ responses for two or more DL data channels. In this case, an order may be assigned to valid DL data channels candidates (eg, valid TDRA indexes) in the slot (or sub-slot). A reference symbol (eg, symbol m) may be defined. For example, among the last symbols of valid DL data channel candidates, the most advanced symbol in the time domain may be set as a reference symbol (eg, symbol m).

If the first symbol (e.g., symbol S) of a valid DL data channel candidate is the same as symbol m, or if the first symbol (e.g., symbol S) of a valid DL data channel candidate is located earlier than symbol m, a valid The order of the HARQ response bits for the DL data channel candidate may be fast in the HARQ response codebook. When an order is assigned to valid DL data channel candidates, the ordered DL data channel candidate may be excluded in a procedure for determining symbols S and m afterwards.

In this case, the base station may allocate two or more DL data channels overlapping in the time domain but not overlapping in the frequency domain to the terminal. This operation may be necessary in a communication system that supports eMBB service and URLLC service. The terminal is a HARQ response of a DL data channel for supporting eMBB service (eg, high-performance communication service) and a HARQ response of a DL data channel for supporting URLLC service (eg, a service supporting error rate 1E-5) May be multiplexed in the same HARQ response codebook.

In order to support high-level URLLC service (e.g., a service supporting error rate 1E-6), the base station does not need to allocate two or more DL data channels overlapping in the time domain but not overlapping in the frequency domain to the terminal. . The reason is that the HARQ response codebook in which HARQ responses to DL data channels are multiplexed to support eMBB services (eg, high-performance communication services) is multiplexed HARQ responses to DL data channels to support high-level URLLC services. This is because it is different from the HARQ response codebook.

Since the DL data channel is allocated to a small number of symbols, when a new DL data channel for a new TB is allocated, the new DL data channel may not overlap with the previous DL data channel in the time domain. As the size of the HARQ response codebook decreases, the UL control channel and/or the UL data channel reception quality may increase. Accordingly, it is preferable that the base station allocates DL data channels so that DL data channels do not overlap in the time domain.

In the proposed method, when DL data channel candidates overlap in the time domain, the UE may select one DL data channel candidate from the overlapped DL data channel candidates, and consider the selected DL data channel candidate as a valid DL data channel candidate. can do. Valid DL data channel candidates may not include UL symbols. The terminal may generate a HARQ response for a valid DL data channel candidate, and may not generate a HARQ response for the remaining invalid DL data channel candidates. The operation of selecting a DL data channel candidate that does not overlap in the time domain may be added to the procedure of generating the HARQ response codebook.

Meanwhile, a procedure for excluding TDRA indexes can be applied in various ways. For example, a proposed procedure may be applied first, and then a conventional procedure may be applied. Alternatively, the proposed procedure may be applied in the process of applying the conventional procedure. Alternatively, a conventional procedure may be applied first, and the HARQ response bit (eg, HARQ response value) may not be mapped to some positions of the HARQ response codebook. Alternatively, a known value (eg, NACK) may be mapped to some locations of the HARQ response codebook.

According to a difference in procedure, the positions of the HARQ response bits for the same TDRA index in the HARQ response codebook may be different. The procedure for generating the HARQ response codebook may be shared between the base station and the terminal. Therefore, since the base station knows the order of allocation of the DL data channel, it can know the location of the HARQ response bit for the corresponding DL data channel in the HARQ response codebook.

The proposed procedure can be additionally applied to TDRA indexes set in the terminal. The terminal may derive simple TDRA indexes and may generate a HARQ codebook for simple TDRA indexes using a conventional procedure. The simple TDRA indexes may be the remaining TDRA indexes excluding the TDRA indexes overlapping in the time domain among all the TDRA indexes.

33 is a conceptual diagram showing a first embodiment of a method for setting a TDRA index in a communication system.

Referring to FIG. 33, TDRA index 0 may overlap with TDRA index 1 in some symbols in the time domain. In order to support a high level of URLLC service, the base station may request transmission of a HARQ response for TDRA index 0 or TDRA index 1 to the terminal. Although there are two TDRA indexes, the terminal may generate a HARQ response for one TDRA index (eg, one DL data channel candidate). That is, the HARQ response for one DL data channel candidate may be included in the HARQ response codebook. In the HARQ response codebook, the HARQ response for TDRA index 0 need not be distinguished from the HARQ response for TDRA index 1. The reason is that since the terminal follows the instruction of the base station, the base station can know which TDRA index the HARQ response to which the HARQ response codebook received from the terminal includes.

34A is a conceptual diagram showing a second embodiment of a method of setting a TDRA index in a communication system, FIG. 34B is a conceptual diagram showing a third embodiment of a method of setting a TDRA index in a communication system, and FIG. A conceptual diagram showing a fourth embodiment of a method for setting a TDRA index in the system.

34A to 34C, TDRA index 2 may overlap with TDRA index 0 and TDRA index 1 in some symbols in the time domain. According to the conventional procedure, the order of the HARQ response in the HARQ response codebook in the embodiment shown in FIG. 34A may be "HARQ response for TDRA index 2 → HARQ response for TDRA index 0 → HARQ response for TDRA index 1" have. In the embodiment shown in FIG. 34B, the order of the HARQ response in the HARQ response codebook may be "HARQ response for TDRA index 0 → HARQ response for TDRA index 2 → HARQ response for TDRA index 1". In the embodiment shown in FIG. 34C, the order of the HARQ response in the HARQ response codebook may be "HARQ response for TDRA index 0 → HARQ response for TDRA index 2 → HARQ response for TDRA index 1".

According to the proposed method, when the allocation information of the TDRA index 2 is obtained, the terminal can expect to not acquire the allocation information of the TDRA index 0 and the allocation information of the TDRA index 1. When the UE acquires allocation information of TDRA index 0 and/or allocation information of TDRA index 1, it may be expected that the UE does not acquire allocation information of TDRA index 2. In this case, the UE may generate a HARQ response codebook for two TDRA indexes.

When one TDRA index corresponds to one HARQ response bit (or HARQ response bit pair), the HARQ response may be represented by two HARQ response bits (or two pairs of HARQ response bits). The first HARQ response bit (or, the first HARQ response bit pair) may correspond to TDRA index 0 or TDRA index 2. The second HARQ response bit (or the second HARQ response bit pair) may correspond to TDRA index 1 or TDRA index 2. The HARQ response bit for TDRA index 2 may belong to one of the first HARQ response bit (or, the first HARQ response bit pair) or the second HARQ response bit (or the second HARQ response bit pair).

The order of HARQ response bits in the HARQ response codebook generated by the terminal may be "HARQ response bit for TDRA index 0 → HARQ response bit for TDRA index 1". When the TDRA index 0 is allocated, the terminal may map the HARQ response for the TDRA index 0 to the first position in the HARQ response codebook. When TDRA index 1 is allocated, the terminal may map the HARQ response for the TDRA index 1 to a second position in the HARQ response codebook. When TDRA index 2 is allocated, the terminal may map the HARQ response for the TDRA index 2 to the first position or the second position in the HARQ response codebook. When the HARQ response codebook does not include the HARQ response for the TDRA index, the corresponding HARQ response codebook may be regarded as NACK.

In the proposed method, the terminal is configured according to the instruction of the DL control channel. UCI May not be transmitted.

The UE may generate UCI based on the DL control channel (eg, DCI) received from the base station. In particular, the terminal may generate a HARQ response for the DL data channel scheduled by the DL control channel. The DL control channel may include radio resource information of the DL data channel and radio resource information of the UL control channel. According to the conventional method, the terminal may generate a HARQ response for a DL data channel scheduled by a DL control channel, and use a radio resource set by the base station to establish a UL control channel or a UL data channel including a HARQ response. Can be transmitted.

In a communication system supporting a minimum transmission delay of data and a short deadline, the base station may not be able to decode the UL control channel including the HARQ response. For example, if the terminal fails to decode the DL data channel allocated by the base station and transmits the NACK, the base station must allocate the DL data channel again. If the remaining time for TB is small, the base station may not be able to receive the HARQ response from the terminal. In this case, it is preferable that the terminal does not transmit the HARQ response to the base station. Since the UE cannot know the remaining time for the TB, it may determine whether to feedback the HARQ response according to the signaling of the base station. The base station may inform the UE of whether to feedback the HARQ response using an explicit signaling method or an implicit signaling method.

When the implicit signaling method is used, the base station may inform the terminal of whether to feedback the HARQ response by using a combination of values of fields included in the DCI. The terminal may receive the DCI from the base station, and when the combination of values of the fields included in the DCI has a first value, it may determine that the feedback of the HARQ response is requested. The UE may determine that feedback of the HARQ response is not requested when the combination of values of the fields included in the DCI has a second value. The combination of values of fields included in the DCI may indicate invalid scheduling or valid scheduling to the terminal.

The above-described operation can be applied not only when the DL data channel is dynamically scheduled, but also when the DL data channel is semi-fixedly scheduled. When the DL data channel is set by the SPS and the DCI indicates activation of the DL data channel set by the SPS, the UE may determine whether to feedback the HARQ response based on the corresponding DCI.

Meanwhile, the terminal may transmit HARQ responses for two types of DL data channels (eg, DL data channels A and B) through the same UL control channel. Feedback of the HARQ response for the DL data channel A is required, but feedback of the HARQ response for the DL data channel B may not be required. The terminal may generate a HARQ response codebook including at least the HARQ response for the DL data channel A. The size of the HARQ response codebook may be determined in consideration of at least the HARQ response for DL data channel A.

When the size of the HARQ response codebook is semi-fixedly indicated (for example, type 1 in the 3GPP technical standard), the size of the HARQ response codebook may be determined by reflecting both the number of DL data channels A and the number of DL data channels B. have. The terminal may map the HARQ response bit for the DL data channel A to the HARQ response codebook, and a value (eg, NACK) already known as the HARQ response bit for the DL data channel B may be mapped to the HARQ response codebook.

When the size of the HARQ response codebook is dynamically indicated (eg, 3GPP technical specification type 2), the size of the HARQ response codebook may be determined by reflecting the DAI for DL data channel A. DAI may be obtained from the DL control channel(s), and the terminal may not increase DAI when receiving DCI for DL data channel B.

If one or more of the methods proposed below are applied, the UE may not feed back the HARQ response. In the proposed methods, the base station can inform the terminal of whether to feedback the HARQ response by using an explicit signaling method or an implicit signaling method. The terminal may not feed back the HARQ response according to the instruction of the base station.

The DCI (eg, DL-DCI) transmitted on the DL control channel may include radio resource information of a DL data channel and characteristic information of a TB. For example, DCI may include a new data indicator (NDI) field, HARQ process identification information, a CBG transmission index, a CBG flush index, a DAI field, a UL control channel resource index (PUCCH resource index), and the like. .

In the proposed method, NDI The value of the field can be changed, DAI The value of the field (eg, counter DAI and/or total DAI) may not be changed.

In the conventional method, the toggled NDI may indicate that the TB allocated by DCI is a new TB. The terminal may determine that the size of the HARQ response codebook is maintained the same as before based on the value of the DAI field. That is, the UE may determine that there is no new UCI, and thus may not generate a HARQ response for a new TB. Alternatively, the terminal may not include the HARQ response in the HARQ response codebook even when generating the HARQ response for the new TB.

In the proposed explicit signaling method, the base station can explicitly inform the terminal of whether to feedback the HARQ response using a specific field included in the DCI . For example, when a specific field included in DCI has a first value, the terminal may feed back the HARQ response to the base station. When a specific field included in DCI has a second value, the terminal may not feed back the HARQ response to the base station.

In the following embodiments, "the HARQ response codebook does not include the HARQ response bit" means "the terminal corresponds to a value (eg, NACK) already known in the HARQ response codebook (eg, corresponds to the HARQ process) Mapping to a location)" or "a HARQ response bit is missing in the HARQ response codebook". For example, when the size of the HARQ response codebook is semi-fixedly determined, the terminal may map a known value to a corresponding location in the HARQ response codebook. When the size of the HARQ response codebook is dynamically changed, the UE may not map the HARQ response bit to the HARQ response codebook. That is, the HARQ response bit may be omitted from the HARQ response codebook.

Suggested suggestive Signaling In the method, the terminal has a TB Low latency TB for communication (hereinafter, " Low latency TB"), the base station Low latency A redundancy version (RV) for TB may be set to a specific value, and an RV set to a specific value may be informed to the terminal. When RV is set to a specific value, the terminal Low latency HARQ response for TB (for example, UCI )and One-to-one The corresponding UL control channel may not be transmitted. Or, the terminal Low latency For TB HARQ Response (for example, UCI )of HARQ It may not be mapped to the response codebook.

The above-described operation can be applied to a TB allocated by DCI and a TB allocated by SPS. When the TB is allocated by semi-fixed scheduling (eg, SPS), the terminal may check whether the TB is a low-latency TB based on the logical channel index. When the TB is allocated by dynamic scheduling (eg, DCI), the UE controls the DL control channel (eg, DCI) of a search space (eg, a specific search space set by higher layer signaling) or DL control Based on the RNTI used for scrambling the channel (eg, CRC of DCI) (eg, MCS-C-RNTI or separate RNTI), it may be determined whether the TB is a low-latency TB.

When the DL data channel is allocated by the DL control channel, the base station may explicitly inform the terminal of the RV for the codeword. The RV of the initially transmitted TB may be set to a specific value. According to the proposed method, the terminal may know in advance the sequence of specific values of the RV. Therefore, when the base station informs the terminal of the RV set to a specific value, the terminal may determine that the corresponding TB is the first transmission TB or the retransmission TB based on the RV. The UE may generate a HARQ response (eg, UCI) by decoding the TB, and may not map the HARQ response to the HARQ response codebook.

For example, the value of RV may be 0, 1, 2, or 3. When RV is set to 1 or 3, the HARQ response for TB may not be included in the HARQ response codebook. When RV is set to 0 or 2, the HARQ response for TB may be included in the HARQ response codebook. These operations can be indicated by higher layer signaling. Alternatively, these operations may be predefined in the 3GPP technical standard. The UE does not know whether the TB is the initial transmission TB or the retransmission TB, but may determine whether to feedback the HARQ response to the TB based on the RV.

For example, if the terminal knows that the RV is indicated by a sequence and the RV is expressed in the order of 0, 2, 3, 1, if the RV is set to 0, the HARQ response for TB may be included in the HARQ response codebook. And, if the RV is set to the remaining value (eg, 2, 3, or 1), the HARQ response may not be included in the HARQ response codebook. These operations can be indicated by higher layer signaling. Alternatively, these operations may be predefined in the 3GPP technical standard. When the RV is set to 0, the UE may determine that RV 0 is reassigned by the base station even when the TB is the initial transmission TB or the retransmission TB. Accordingly, the terminal may generate a HARQ response by decoding the TB, and may map the HARQ response to the HARQ response codebook.

For example, when the RV is set to a specific value (eg, 1), the terminal may not feed back the HARQ response to the TB. That is, the HARQ response may not be mapped to the HARQ response codebook. Alternatively, when the RV is set to a different value (eg, 0, 2, or 3), the terminal may feed back the HARQ response to the TB. That is, the HARQ response may be mapped to the HARQ response codebook.

Suggested suggestive Signaling In the method, the terminal has a TB Low latency Is TB Can know and schedule the TB To DCI included NDI If the existing value is maintained, the terminal HARQ Response (for example, UCI )and One-to-one The corresponding UL control channel may not be transmitted. For that TB HARQ The answer is HARQ In the response codebook Not mapped May not.

The above-described method can be applied when the TB is dynamically scheduled or when the TB is semi-fixedly scheduled. The terminal can know that the TB is a low-latency TB based on the above-described methods. When the above-described method is applied, the UE may determine that the TB is a retransmission TB when the NDI included in the DCI is maintained, and thus may not feed back the HARQ response.

Suggested suggestive Signaling In the method, set by the base station HARQ The feedback time of the response is less than a certain value, To DCI included NDI If the existing value is maintained, the terminal HARQ Response (for example, UCI )and One-to-one The corresponding UL control channel may not be transmitted. Or, for that TB HARQ The answer is HARQ It may not be mapped to the response codebook.

The base station may set a specific value in consideration of the processing capability of the terminal, and may inform the terminal of the specific value through higher layer signaling. Alternatively, when a specific value is set as the minimum feedback time value according to the processing capability of the terminal, higher layer signaling to inform the specific value may not be performed. When the NDI included in the DCI is set to a new value, the UE may determine that the corresponding TB is a new TB, and may feed back a HARQ response for the new TB. The base station may not instruct to perform a quick feedback operation beyond the processing capability of the terminal.

The terminal may receive the DL data channel in the minimum time interval required according to the processing capability, and may generate a HARQ response for a TB (eg, a DL data channel) by decoding the DL data channel. The terminal may inform the base station of its processing capability by using higher layer signaling. When a specific value is the minimum feedback time required by the terminal (for example, when the feedback time of the HARQ response indicated by the DCI scheduling TB exceeds the processing capability of the terminal), the terminal cannot feedback the HARQ response. In this case, the UE performs a decoding operation on the DL data channel, but may not transmit the HARQ response resulting from the decoding operation through the UL control channel. The HARQ response may not be mapped to the HARQ response codebook.

In the proposed method, To DCI Containing fields set to specific values HARQ Dictate the feedback time of the response, To DCI included NDI If it is maintained at the existing value, the terminal To DCI due to Scheduled For TB HARQ Response (for example, UCI )and One-to-one The corresponding UL control channel may not be transmitted. HARQ The answer is HARQ It may not be mapped to the response codebook.

According to a conventional method, the base station can set time resources of UL control channels using higher layer signaling, and can transmit DCI indicating one time resource among time resources set by higher layer signaling. The UE may transmit the HARQ response for the DL data channel through the UL control channel indicated by higher layer signaling and DCI. In the proposed method, a specific value among values set by higher layer signaling may indicate that the HARQ response (eg, UCI) is not included in the HARQ response codebook.

The slot for feeding back the HARQ response may be indicated by DCI. For example, "PDSCH-to-HARQ_feedback timing indicator" defined in Table 8 below may be included in DCI, and may indicate a slot for feeding back a HARQ response.

dl- DataToUL - ACK may be configured in the terminal using higher layer signaling. The dl-DataToUL-ACK may have a value between 0 and 15, and the number of dl-DataToUL-ACKs configured in the terminal may be up to 8. In the proposed method, dl- DataToUL - ACK may be set to a value other than 0 to 15. Dl- DataToUL -ACK having a different value may be set to the terminal by using a higher layer signaling. When the "PDSCH-to-HARQ_feedback timing indicator" included in the DCI indicates dl- DataToUL - ACK having a different value, the terminal does not map the HARQ response for the DL data channel scheduled by DCI to the HARQ response codebook. I can. For example, if dl- DataToUL - ACK has a value other than 0 to 15, a value defined in the 3GPP technical standard, or a value set by higher layer signaling, the terminal may have any HARQ response bit for TB (e.g. , HARQ ACK bit) may not be mapped.

In the proposed method, To DCI The included PRI is set to a specific value, To DCI included NDI If it is maintained at the existing value, the terminal To DCI due to Scheduled For DL data channel HARQ Response (for example, UCI )and One-to-one The corresponding UL control channel may not be transmitted. The HARQ response may not be mapped to the HARQ response codebook.

The base station can configure a set of UL control channels to the terminal using higher layer signaling. The UE may check radio resources of the UL control channel based on a specific field included in the DL control channel (eg, DCI) or a CCE index to which the DL control channel is mapped. When the radio resource indicated by the DCI is a specific radio resource among radio resources of UL control channels configured by higher layer signaling, the terminal may determine that the feedback of the HARQ response is not requested.

In the proposed method, the terminal HARQ Answer is NACK Inn In some cases, a UL control channel including a corresponding HARQ response may be transmitted.

Meanwhile, when the transmission target error rate of the DL data channel is low, the difference between the ACK generation rate and the NACK generation rate may increase. When the transmission target error rate is 1E-1, the expected rate of occurrence of ACK and NACK may be 9:1. When the transmission target error rate is 1E-5, the expected generation ratio of ACK and NACK may be 99999:1. Instead of allocating radio resources for the HARQ response, if the HARQ response feedback operation is performed through a separate procedure when the HARQ response is NACK, the usage of UL radio resources may be reduced.

In the proposed method, when the HARQ response is NACK, the UE may transmit a UL control channel including the corresponding HARQ response. The radio resource of the UL control channel may be indicated by information included in the DCI scheduling TB associated with the corresponding UL control channel. When the transmission target error rate of the DL data channel is low, it is preferable that the base station does not allocate TB to two or more terminals. The terminal may receive 1 TB from the base station and may generate a HARQ response for the received TB.

In the proposed method, one radio resource for the feedback of the HARQ response may be shared by a plurality of terminals, and the terminal shares its identification information to the base station using the shared radio resource when the HARQ response is NACK. Can be transmitted. Here, the identification information may be information obtained from the RNTI or DCI of the terminal (eg, PDSCH DM-RS ID).

When the DL data channel is semi-fixedly scheduled and the feedback period of the HARQ response configured in the terminal is short (for example, when the feedback period is a few slots or a few symbols), to transmit a HARQ response for each DL data channel The size of the UL control channel required may be large. In this case, the UE can transmit a UL control channel including NACK only when NACK occurs. Accordingly, the size of the required UL control channel can be reduced, and power consumption in the terminal can be reduced.

Since the result of the decoding operation on the DL data channel is mostly ACK, the UE may not transmit the UL control channel in most cases. Therefore, if the HARQ response (eg, UL control channel) is not received from the terminal, the base station may determine that the DL data channel associated with the corresponding HARQ response has been successfully received by the terminal. When the base station receives a HARQ response (eg, UL control channel) from the terminal, the base station may regard the HARQ response as NACK.

In the case of feedback of the HARQ response to the SPS PDSCH, the UE may use the format of the UL control channel for transmitting 1 UCI bit (eg, 1 HARQ response bit). Since the UL control channel is configured with a specific sequence, the base station may regard the HARQ response as NACK when a specific sequence is detected in the UL control channel. The base station may consider that the HARQ response is ACK if a specific sequence is not detected in the UL control channel.

The UE may map a HARQ response for a dynamically allocated DL data channel (eg, a large amount of UCI) and a HARQ response for a semi-statically allocated DL data channel to the same UL control channel. In this case, when the size of the HARQ response codebook is dynamically determined, the HARQ response codebook may not include the HARQ response for the SPS PDSCH. When the size of the HARQ response codebook is semi-fixedly determined, the HARQ response codebook may include a HARQ response for the SPS PDSCH.

In the proposed method, some DL data channel(s) among a plurality of DL data channels activated among the semi-statically allocated DL data channels HARQ Response feedback can be omitted.

When the base station periodically transmits the DL data channel to the terminal, the PDSCH may be transmitted through semi-fixed resource allocation, but the PDCCH transmission may be omitted. This operation can be introduced for periodic transmission of small traffic (eg, voice over internet protocol (VoIP) traffic) and reduction of CCE overhead. In the NR communication system, URLLC traffic may have a small size similar to VoIP traffic. Also, URLLC traffic may be periodically transmitted similar to VoIP traffic. The transmission reliability of URLLC traffic may be higher than that of VoIP traffic. Since a low coding rate is applied to a TB having a small size, the number of REs to which the DL data channels are mapped in the resource grid may not be small.

Alternatively, URLLC traffic may not be periodically transmitted. For example, URLLC traffic may occur periodically on average, but may occur instantaneously and randomly. In this case, the URLLC traffic may have a random offset, and the average period of the URLLC traffic may be semi-fixed. The random offset may be referred to as jitter, and the average period may be referred to as a cycle time.

For example, according to TS 22.804, the cycle time of a mobile control panel with safety function may be 4 ms (millisecond) or more and 8 ms or less, and the mobile control panel with safety function is less than 50%. Can have jitter of The data size can be 40 bytes or more and 250 bytes or less. According to TS 22.804, the cycle time of a mobile robot can be variously set. The cycle time required for precise motion control may be 1 ms. The cycle time required for typical mobile robot operation may be 500 ms or less, and jitter may be less than 50%. According to TS 22.804, the cycle time of process automation can be within 10 ms, and jitter can be less than 10%.

The base station may set the DL SPS to the terminal using uplink signaling (eg, RRC message). The RRC message for configuring the DL SPS may include information indicating a time resource to which the SPS PDSCH is allocated (eg, periodicity, subframe offset).

In the proposed method, SPS PDSCH Cycle symbol Alternatively, it may be set in units of slots.

When the period of the SPS PDSCH is set to a physical time (ms), the period of the SPS PDSCH may be set regardless of the subcarrier spacing of the DL BWP. In order to support transmission of various traffic in the SPS PDSCH, it may be desirable to set the period of the SPS PDSCH to a relative time. In the proposed method, the period of the SPS PDSCH may be set in units of slots or symbols.

According to the conventional method, the period of the SPS PDSCH may be set to one of 10 ms, 20 ms, 32 ms, 40 ms, 64 ms, 80 ms, 128 ms, 160 ms, 320 ms, and 640 ms. In this case, traffic having a transmission period shorter than the radio frame (eg, 5 ms) cannot be transmitted through the SPS PDSCH. To solve this problem, it may be desirable to set the period of the SPS PDSCH in units of slots or symbols. In this case, since the period of the SPS PDSCH is determined based on the subcarrier spacing, it can be interpreted that the sub-divided period of the SPS PDSCH is introduced. For example, if the period of the SPS PDSCH is interpreted as 10 ms (eg, 10 slots) at the subcarrier interval of 15 kHz, the period of the SPS PDSCH may be interpreted as 5 ms at the subcarrier interval of 30 kHz, and the subcarrier interval of 60 kHz. In the SPS PDSCH period can be interpreted as 2.5 ms.

Meanwhile, the period of the UL SPS allocated by the UL configuration grant may be defined in units of symbols or slots. Values and units related to the UL SPS period may be equally applied to the DL SPS period. The period of UL SPS or DL SPS is 2 symbols, 6 symbols, 7 symbols, 1 slot, 2 slots, 4 slots, 5 slots, 8 slots, 10 slots S, 6 slots, 20 slots, 128 slots, 160 slots, 256 slots, 320 slots, 512 slots, 640 slots, 1280 slots, or 2560 slots Can be used. When the extended CP is used, one slot may include 12 symbols. When a general CP is used, one slot may include 14 symbols.

In the proposed method, DCI indicating activation of SPS PDSCH, DCI indicating activation of SPS PUSCH, DCI indicating release of activated SPS PDSCH, and DCI indicating release of activated SPS PUSCH are each It may include an index and/or a bitmap. Each of the index and bitmap included in the DCI may indicate a combination of one or more SPS PDSCHs (or a combination of one or more SPS PUSCHs).

The base station may set a plurality of DL SPSs for the DL BWP in the terminal using higher layer signaling (eg, RRC message), and some of the DL SPS(s) among the plurality of DL SPSs set by higher layer signaling DL-DCI can be transmitted to the terminal to activate or deactivate. DL-DCI (eg, CRC of DL-DCI) may be scrambled by a specific RNTI. The UE may determine that the SPS PDSCH indicated by the DL-DCI is activated or deactivated.

These operations can be applied equally to UL SPS. The base station may set a plurality of UL SPSs for UL BWP in the terminal using higher layer signaling (eg, RRC message), and some UL SPS(s) among a plurality of UL SPSs set by higher layer signaling UL-DCI may be transmitted to the terminal to activate or deactivate. UL-DCI (eg, the CRC of UL-DCI) may be scrambled by a specific RNTI. The UE may determine that the SPS PUSCH indicated by UL-DCI is activated or deactivated.

A plurality of DL SPSs may be configured in the DL BWP, and activation or deactivation of the DL SPS may be indicated by DL-DCI (eg, DCI format 1_0, DCI format 1_1, or DCI format 1_2). DL-DCI may indicate a unique DL SPS. Therefore, a separate index for indicating the DL SPS may not be required. When two or more DL SPSs are activated in the DL BWP, the DL-DCI may include a field indicating activated DL SPSs. That is, a specific field included in the DL-DCI may indicate two or more DL SPSs.

In the proposed method, a specific field included in the DL-DCI may indicate one or more DL SPS indexes. When a specific field of the DL-DCI includes one or more DL SPS indexes, the length of the specific field of the DL-DCI may depend on the number of bits required to represent the DL SPS index.

The base station may know the size of a specific field (eg, a specific field included in DCI) indicating one or more DL SPS indexes based on the number of DL SPSs set in the DL BWP. The base station may inform the terminal of information instructing reception of DL-DCI including a specific field indicating one or more DL SPS indices using higher layer signaling (eg, RRC message). In this case, the RRC message may include DL-DCI related information (eg, the size of a specific field).

In the proposed method, a specific field of DL-DCI may include a bitmap indicating one or more DL SPS indexes. The length of the bitmap may be determined based on the number of DL SPSs set in the DL BWP. A bit set to 0 in the bitmap may indicate that the DL SPS is deactivated, and a bit set to 1 in the bitmap may indicate that the DL SPS is activated. The base station may inform the terminal of information instructing reception of DL-DCI including a bitmap indicating one or more DL SPS indices using higher layer signaling (eg, RRC message). In this case, the RRC message may include DL-DCI related information (eg, the length of a bitmap).

In the proposed method, the DL-DCI can activate or deactivate one or more DL SPSs. To support this operation, one DL SPS index or one bit included in the bitmap may indicate two or more DL SPSs. A set consisting of one or more DL SPSs may be referred to as a DL SPS set. The SPS PDSCH period for each of the DL SPSs belonging to the same DL SPS set, the resource index of the UL control channel used for the HARQ response, the MCS table, and the number of HARQ processes may be set equally or independently. DL SPSs belonging to the same DL SPS set may be activated or deactivated by one DL-DCI.

Meanwhile, DL SPS activated by DL-DCI can be applied to other DL BWPs. For example, when the DL SPS is set in DL BWP 1, the DL SPS indicated by the DL SPS index or bitmap included in the DL-DCI may be applied to DL BWP 2. The DL SPS(s) indicated by the DL-DCI may indicate the DL SPS(s) activated in the current DL BWP 1 and/or the changed DL BWP 2. In this case, the terminal may determine that the DL SPS(s) are activated or deactivated in DL BWP 2. The DL SPS index or bitmap included in the DL-DCI of DL BWP 1 may be different.

For example, if the length of a specific field in DL BWP 1 (that is, a specific field included in DL-DCI) is shorter than the length of a specific field in DL BWP 2, the length of a specific field in DL BWP 1 is changed in DL BWP 2. In order to match the length of a specific field, a most significant bit (MSB) or a least significant bit (LSB) may be added to a value of a specific field in DL BWP 1. Each of the MSB and LSB may be 0 or 1. The UE may determine that the DL SPS(s) indicated by the DL-DCI of DL BWP 1 are activated in DL BWP 2. For example, if the length of a specific field (that is, a specific field included in the DL-DCI) in DL BWP 1 is longer than the length of a specific field in DL BWP 2, the UE sets the length of a specific field in DL BWP 1 to DL BWP. In order to match the length of a specific field in 2, the MSB or LSB from among the values of the specific field in DL BWP 1 may be deleted. The UE may determine that the DL SPS(s) indicated by the DL-DCI of DL BWP 1 are activated in DL BWP 2.

These operations can be applied to UL SPS (eg, configuration grant type 2 of an NR communication system). The CRC of the UL grant (eg, DCI format 0_0, DCI format 0_1, or DCI format 0_2) may be scrambled by an RNTI (eg, CS-RNTI) to support UL SPS. In this case, a specific field of UL-DCI may indicate one or more UL SPS indexes. When a specific field of UL-DCI indicates two or more UL SPS indexes, the specific field may be expressed as a bitmap. The UL SPS index(s) or bitmap included in the UL-DCI may indicate one or more UL SPSs among a plurality of UL SPSs set by higher layer signaling.

The base station may check the size of a specific field (eg, bitmap) included in the UL-DCI based on the number of UL SPSs configured in the terminal. The base station may set information indicating the size of a specific field (eg, bitmap) of UL-DCI to the terminal using higher layer signaling. This setting operation may be performed in consideration of the number of SPS PUSCHs set in the carrier. When the size of a specific field (eg, a specific field included in UL-DCI) in UL BWP 1 is different from the size of a specific field in UL BWP 2, MSB or LSB may be added to a specific field of UL-DCI. . Alternatively, the MSB or LSB may be deleted from the values of a specific field of UL-DCI.

In the proposed method, SPS PDSCH HPID ( HARQ process identifier) can be determined based on the symbol used for initial transmission.

According to the conventional method, the HPID for the SPS PDSCH may be determined based on the slot or subframe to which the time resource of the SPS PDSCH belongs. Since one DL SPS is activated in the DL BWP, the HPID is explicitly specified by DL-DCI (e.g., DCI format 1_0, DCI format 1_1, or DCI format 1_2) so that the HPIDs of dynamically allocated PDSCHs do not overlap. Can be indicated as

In the proposed method, the reference time for deriving the HPID may be the first symbol of the SPS PDSCH. The first symbol of the SPS PDSCH is in the first radio frame (eg, the first SFN (system frame number)), the current radio frame (eg, current SFN), and the current slot (eg, slot number). It may be derived based on the index of the located symbol (eg, symbol number).

For example, the HPID may be determined based on "[floor(CURRENT_symbol/periodicity)] modulo nrofHARQ-Processes". CURRENT_symbol may be a result of (SFN × numberOfSlotsPerFrame × numberOfSymbolsPerSlot + slot number in the frame × numberOfSymbolsPerSlot + symbol number in the slot). numberOfSlotsPerFrame may indicate the number of slots included in the radio frame. numberOfSymbolsPerSlot may indicate the number of symbols included in the slot. Each of numberOfSlotsPerFrame and numberOfSymbolsPerSlot may be a constant defined in the 3GPP technical standard. periodicity may indicate the period of the DL SPS. nrofHARQ-Process may indicate the number of HARQ processes. The base station may inform the terminal of periodicity and nrofHARQ-Process using higher layer signaling (eg, RRC message).

When two or more DL SPSs are activated, HPIDs for two or more DL SPSs may be the same even though reference times for deriving an HPID are different from each other. In this case, the HARQ process performed by the terminal may not be accurately defined. When two or more DL SPSs having the same HPID exist (for example, when two or more DL SPSs having the same HPID are received), the terminal may regard the corresponding HPID as an HPID for one DL SPS.

To solve this problem, when HPIDs of DL SPSs collide, an offset of the HPID may be applied in one DL SPS. Therefore, the HPID of DL SPSs can always have different values. This operation can be applied when two DL SPSs have the same HPID. The period of the DL SPS for supporting URLLC may be a small number of symbols. Therefore, three or more DL SPSs having the same HPID may exist. When the HPID offset is applied, the HPID of the DL SPS according to the HPID offset may be the same as the HPID of other DL SPSs. Therefore, when the HPID offset is applied, another collision problem may be caused.

In the proposed method, the base station is the same HPID Eggplant DL SPS I know, so the DL SPSs Between To HPID late Mapped DL SPS Dynamic scheduling operation can be performed. That is, the corresponding DL SPS It may be a dynamic scheduling operation rather than a semi-fixed scheduling operation.

The base station can dynamically allocate the PDSCH in the time resource overlapping the SPS PDSCH in the time domain. When the PDSCH that is semi-fixedly allocated in the time domain overlaps with the dynamically allocated PDSCH, the terminal can expect to receive DL data through the dynamically allocated PDSCH. This operation may be a method of considering the HPID as the HPID for the SPS PDSCH received earlier.

In the proposed method, HPID is Received late SPS On PDSCH About By HPID To be considered Can. The terminal has previously received SPS On PDSCH About To HPID The soft bit of the last received SPS PDSCH may be stored in the corresponding soft buffer location.

When two or more SPS PDSCHs are received by the terminal at a similar time point, the base station may have a temporal margin for the retransmission procedure of the SPS PDSCH received earlier by the terminal. When the SPS PDSCH transmission satisfies the URLLC requirement, the base station can quickly proceed with the retransmission procedure. Therefore, it may be desirable to use the corresponding HPID for the SPS PDSCH received late in the terminal.

In the proposed method, the terminal is a DL SPS DL- Activated To DCI Implicitly or explicitly indicated by Of traffic Priority (e.g. URLLC with high priority) traffic Or lower priority eMBB traffic ) Can be interpreted as the HPID for the SPS PDSCH having a high priority.

When the HPID for the SPS PDSCH supporting URLLC is the same as the HPID for the SPS PDSCH supporting eMBB, the UE may not receive the SPS PDSCH supporting eMBB. In this case, the UE may not feed back a HARQ response (eg, a HARQ response for an SPS PDSCH supporting eMBB). Alternatively, the UE may feed back NACK.

These operations can be applied to UL SPS. When two or more SPS PUSCHs have the same HPID, three or more SPS PUSCHs may have the same HPID even if an HPID offset is applied. Alternatively, the HPID of the SPS PUSCH to which the HPID offset is applied may collide with the HPID for another UL SPS.

If the proposed method is applied, the base station is HPID Eggplant UL SPS Knowing that, by performing dynamic scheduling, Of SPS HPID Conflicting problems can be solved.

The base station may receive a buffer status report (BSR) from the terminal. Accordingly, the base station can dynamically allocate the UL data channel at an appropriate time based on the BSR. Since the HPID of the dynamically allocated UL data channel may be set differently from the HPID of the UL SPS, a problem in which the HPID of the UL SPS collide can be solved.

In the proposed method, HPID is Sent late SPS PUSCH About By HPID To be considered Can.

The UE may not necessarily periodically transmit the UL data channel according to the UL SPS. Therefore, the problem of the transmission procedure according to the DL SPS may occur at a low frequency in the transmission procedure according to the UL SPS. In particular, when UL SPS supporting URLLC is performed, the terminal can expect the base station to rapidly perform a TB retransmission procedure. Accordingly, when the new SPS PUSCH uses the same HPID, the UE may delete the existing soft bits stored in the soft buffer and may store the new soft bits in the soft buffer.

In the proposed method, UL SPS UL- activated DCI Accordingly, the HPID may be used in the SPS PUSCH having a high priority.

In this case, the UE may map the SPS PUSCH having a low priority to a resource of a next period instead of this period. Therefore, the conflict problem of HPID can be solved.

In the proposed method, SPS PDSCH For the set HARQ A response bit can be derived.

A DL SPS set (eg, a set including two or more DL SPSs) to support DL URLLC traffic may be activated. DL URLLC traffic can have a certain period and jitter. Accordingly, as the DL SPSs are activated, DL URLLC traffic can be delivered to the terminal through the SPS PDSCHs.

35A is a conceptual diagram showing a first embodiment of a DL SPS setting method for supporting DL URLLC traffic in a communication system, and FIG. 35B is a second embodiment of a DL SPS setting method for supporting DL URLLC traffic in a communication system FIG. 35C is a conceptual diagram illustrating a third embodiment of a DL SPS configuration method for supporting DL URLLC traffic in a communication system.

Referring to FIGS. 35A to 35C, two DL SPSs (eg, DL SPS a and DL SPS b) may be activated. In the embodiment shown in FIG. 35A, DL URLLC traffic may occur before SPS PDSCH #0. In this case, the base station may transmit DL URLLC traffic to the terminal through SPS PDSCH #0. The UE may receive DL URLLC traffic on SPS PDSCH #0, and may transmit a HARQ response for DL URLLC traffic to the base station. The UE may expect not to receive DL URLLC traffic in SPS PDSCH #1. Accordingly, the UE may not perform a monitoring operation for SPS PDSCH #1 and may not feed back a HARQ response for SPS PDSCH #1.

In the embodiment shown in FIG. 35B, DL URLLC traffic may occur between SPS PDSCH #0 and SPS PDSCH #1. The base station may not be able to transmit DL URLLC traffic through SPS PDSCH #0. The UE may perform a monitoring operation for SPS PDSCH #0. Since DL URLLC traffic is not received in SPS PDSCH #0, the terminal may not transmit a HARQ response for DL URLLC traffic to the base station. Alternatively, the terminal may feed back NACK to the base station.

Meanwhile, the base station may transmit DL URLLC traffic to the terminal through SPS PDSCH #1. The UE has not detected SPS PDSCH #0, but can expect to detect SPS PDSCH #1. The UE may detect a DM-RS resource for SPS PDSCH #1 in order to detect SPS PDSCH #1. When a DM-RS resource for SPS PDSCH #1 is detected, the UE may determine that SPS PDSCH #1 is received. Accordingly, the UE may receive DL URLLC traffic in SPS PDSCH #1 and transmit a HARQ response for DL URLLC traffic to the base station.

In the embodiment shown in FIG. 35C, DL URLLC traffic may occur after SPS PDSCH #0-1. In this case, the base station may allocate a DL data channel in a dynamic scheduling scheme and transmit DL URLLC traffic through the DL data channel. The UE may detect the DM-RS resource of SPS PDSCH #0, and when the DM-RS resource is not detected, it may determine that SPS PDSCH #0 is not transmitted. Therefore, the UE may not transmit a HARQ response for SPS PDSCH #0. Alternatively, the terminal may transmit a NACK for SPS PDSCH #0 to the base station.

In addition, the UE may detect the DM-RS resource of SPS PDSCH #1, and may determine that the SPS PDSCH #1 is not transmitted when the DM-RS resource is not detected. Therefore, the UE may not transmit a HARQ response for SPS PDSCH #1. Alternatively, the terminal may transmit a NACK for SPS PDSCH #1 to the base station.

In the proposed method, the terminal is deactivated SPS On PDSCH About HARQ It may not derive a response bit.

In the conventional method, when the size of the HARQ response codebook is semi-fixed, the terminal may multiplex HARQ responses for all DL data channel candidates set by higher layer signaling. This operation may be performed when one DL SPS is configured in a communication system supporting eMBB service.

In a communication system supporting URLLC service, a base station can configure a plurality of DL SPSs in a DL BWP using higher layer signaling, and use DCI to set one or more DL SPSs among a plurality of DL SPSs set by higher layer signaling. Can be activated. The terminal may receive DL data through the activated SPS PDSCH(s). The UE may not feed back HARQ responses to some SPS PDSCHs among the activated SPS PDSCHs. That is, it can be prevented that many HARQ responses are fed back.

In the proposed method, the terminal is an activated DL SPSs One or more of the DLs To SPS HARQ responses to the corresponding SPS PDSCHs may be fed back.

Here, SPS PDSCHs according to one or more DL SPSs may be SPS PDSCHs actually transmitted from the base station. For example, in order to support transmission of URLLC traffic having a period of 6 ms, the base station may activate a DL SPS having a period of 2 ms, and a transmission opportunity of 1/3 of the total transmission opportunities according to the activated DL SPS SPS PDSCH can be transmitted in Since the UE does not detect the presence of the SPS PDSCH at 2/3 of the transmission opportunities according to the activated DL SPS, the HARQ response to the undetected SPS PDSCH may not be fed back.

If it is determined that the SPS PDSCH is not received, the UE may not transmit a HARQ response for the corresponding SPS PDSCH. When the UE feeds back the HARQ response for the SPS PDSCH in the UL control channel, the size of the corresponding HARQ response may be 1 bit or 2 bits. When it is determined that the SPS PDSCH is not received, the UE may not transmit the UL control channel for the corresponding SPS PDSCH.

When a HARQ codebook having a semi-fixed size is configured and it is determined that the SPS PDSCH is not received, the UE may transmit NACK as a HARQ response for the corresponding SPS PDSCH. When a HARQ codebook having a dynamic size is configured, the DAI may be configured without consideration of an SPS PDSCH that is not actually transmitted by the base station. When the DL data channel is dynamically allocated using DL-DCI in the slot to which the SPS PDSCH is allocated or the slot after the slot to which the SPS PDSCH is allocated, the number of DL data channels indicated by the DAI included in the corresponding DL-DCI May not include the SPS PDSCH.

In the proposed method, the terminal SPS PDSCH The existence unit (eg, reception unit) can be interpreted as a DL SPS set.

Referring back to FIGS. 35A to 35C, one DL SPS set may include two DL SPSs. The maximum size of the HARQ response bit for the DL SPS set may be 1 bit. When the SPS PDSCH is composed of two codewords, the size of the HARQ response bit for the DL SPS set may be up to 2 bits.

When the DL URLLC traffic has a large range of jitter, the DL SPS set may consist of a large number of DL SPSs. The maximum size of the HARQ response bit for the DL SPS set may be 1 bit. When the SPS PDSCH is composed of two codewords, the maximum size of the HARQ response bit for the DL SPS set may be 2 bits.

When the HARQ response is generated in units of a DL SPS set, the actual position of the HARQ response bit in the HARQ response codebook may not be determined according to the reception time of the SPS PDSCH. This is because the base station may not transmit the SPS PDSCH. Therefore, the HARQ response bit may be mapped according to the reference position in the HARQ response codebook. For example, the reference position may be set based on symbols of the SPS PDSCH of the first DL SPS or the last DL SPS belonging to the DL SPS set. When SPS PDSCHs for all DL SPSs belonging to the DL SPS set are not received, the UE may map NACK to the HARQ response codebook.

In the proposed method, the terminal may generate a HARQ response codebook including HARQ response bits for dynamically allocated DL data channels, and the entire HARQ response by concatenating the HARQ response bits for the SPS PDSCH to the corresponding HARQ response codebook. You can generate codebooks.

When there is no HARQ response for the SPS PDSCH, the size of the entire HARQ response codebook generated by the terminal may be reduced. The base station may interpret the size of the entire HARQ response codebook to have one of two values. Since the SPS PDSCH is allocated by the base station, the base station can embodiably interpret the size of the entire HARQ response codebook as having one value.

In the proposed method, the terminal is activated by the base station according to the slot pattern. SPS Among the PDSCHs, HARQ responses for some SPS PDSCHs may not be transmitted.

The UE may transmit a HARQ response for the SPS PDSCH on the PUCCH. In a conventional method, the SPS PDSCH may be transmitted through periodically allocated resources, and a HARQ response to the SPS PDSCH may also be transmitted through periodically allocated resources. However, the UE may not be able to periodically transmit the PUCCH (eg, HARQ response) according to the slot format. For example, PUCCH may not be transmitted through a DL symbol. When the FL symbol is changed to a UL symbol, PUCCH may be transmitted through the corresponding UL symbol.

In the proposed method, the transmission timing of the HARQ response may be changed, and the UE may transmit the HARQ response on a transmittable PUCCH. For example, the UE may not transmit HARQ responses for two SPS PDSCHs through a periodically allocated PUCCH. The UE may multiplex HARQ responses for the two SPS PDSCHs and HARQ responses for the last SPS PDSCH, and may transmit the multiplexed HARQ responses through the PUCCH for the last SPS PDSCH. Therefore, the HARQ response bit transmitted by the terminal may vary according to the slot format.

When the terminal does not receive a slot format indicator (SFI) dynamically transmitted from the base station, the number of HARQ response bits may vary. It is preferable that the transmission timing of the PUCCH for the SPS PDSCH set to support URLLC traffic transmission is not changed.

In the proposed method, when the UE cannot transmit the PUCCH for the SPS PDSCH, it may not perform the decoding operation for the SPS PDSCH. Accordingly, the base station may omit transmission of the corresponding SPS PDSCH (eg, SPS PDSCH that is not decoded by the terminal). In order to support transmission of URLLC traffic in a communication system supporting the TDD scheme, when the terminal determines that PUCCH transmission is impossible according to the slot format, the base station may allocate the PDSCH using a dynamic scheduling scheme instead of the DL SPS.

The methods according to the invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like 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 usable by those skilled in computer software.

Examples of computer-readable media include hardware devices specifically configured to store and execute program instructions, such as roms, rams, flash memories, and the like. Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine code such as that produced by a compiler. The above-described hardware device may be configured to operate with at least one software module to perform the operation of the present invention, and vice versa.

Although described with reference to the above embodiments, those skilled in the art understand 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 to.

Claims (20)

As a method of operating a terminal in a communication system,
Receiving DL data #1 from a base station through a downlink (DL) data channel #1;
Receiving DL data #2 from the base station through DL data channel #2; And
Each of the UL (uplink) control channel #1 to which the HARQ (hybrid automatic repeat request) response #1 for the DL data #1 is transmitted and the UL control channel #2 to which the HARQ response #2 for the DL data #2 is transmitted When overlapping with the UL data channel allocated by the base station, transmitting the HARQ response #1 and the HARQ response #2 to the base station through the UL data channel, operating method of the terminal. The method according to claim 1,
At least one of the DL data channel #1 and the DL data channel #2 is indicated by a dynamic scheduling method, and the remaining DL data channels are indicated by a semi-persistent scheduling method. , The operating method of the terminal. The method according to claim 1,
When the priority of each of the DL data #1 and the DL data #2 is the same as the priority of UL data to be transmitted through the UL data channel, the HARQ response #1 and the HARQ response #2 are in the UL data channel. Multiplexed, operating method of the terminal. The method according to claim 1,
Each of the UL control channel #1 and the UL control channel #2 is set in a sub-slot unit, and the UL data channel is set in a slot unit including two or more sub-slots. The method according to claim 1,
One HARQ response codebook including the HARQ response #1 and the HARQ response #2 is generated, and the one HARQ response codebook is multiplexed in the UL data channel. The method according to claim 5,
The one HARQ response codebook is set in a slot unit including two or more sub-slots, the operating method of the terminal. The method according to claim 5,
The arrangement positions of the HARQ response #1 and the HARQ response #2 in the one HARQ response codebook are determined based on the reception time of the DL data #1 and the DL data #2. The method according to claim 5,
The arrangement positions of the HARQ response #1 and the HARQ response #2 in the one HARQ response codebook are at the time of reception of the DL scheduling information #1 of the DL data #1 and the DL scheduling information #2 of the DL data #2. Determined based on the operation method of the terminal. The method according to claim 1,
The UL scheduling information of the UL data channel is received after the DL scheduling information #1 of the DL data #1 and the DL scheduling information #2 of the DL data #2, and the size of the UL data channel is the size of the HARQ response #1. The operation method of the terminal is set in consideration of the size and the size of the HARQ response #2. The method according to claim 1,
The size of the UCI (uplink control information) including the HARQ response #1 and the HARQ response #2 is estimated by UL scheduling information of the UL data channel, and a puncturing operation or rate for the UL data channel Matching (rate matching) operation is performed based on the estimated size of the UCI, the operating method of the terminal. The method according to claim 1,
The encoding time of the HARQ response #1 is the same as the encoding time of the HARQ response #2, the operating method of the terminal. The method according to claim 1,
The HARQ response #1 is multiplexed in radio resources overlapping or adjacent to the UL control channel #1 among radio resources occupied by the UL data channel, and the HARQ response #2 is a radio occupied by the UL data channel. Among resources, multiplexed in radio resources overlapping or adjacent to the UL control channel #2. The method according to claim 1,
When the UL data channel is transmitted based on a frequency hopping scheme, the HARQ response #1 is multiplexed on the UL data channel of hop #n, and the HARQ response #2 is the hop #m. It is multiplexed in a UL data channel, and each of the n and m is a different natural number. The method according to claim 1,
When the UL data channel includes a plurality of UL data channel instances, the HARQ response #1 is multiplexed in UL data channel instance #n, and the HARQ response #2 is multiplexed in UL data channel instance #m. , Wherein each of the n and m is a different natural number. The method according to claim 14,
When the UL control channel #1 overlaps the UL data channel instance #n and the UL data channel instance #n+1, the HARQ response #1 is in the time domain among the UL data channel instances #n and #n+1. It is multiplexed in the UL data channel instance #n located first,
When the UL control channel #2 overlaps the UL data channel instance #m and the UL data channel instance #m+1, the HARQ response #2 is in the time domain among the UL data channel instances #m and #m+1. The operation method of the terminal, which is multiplexed in the UL data channel instance #m located first. The method according to claim 1,
When the DL data channel #2 is located after the DL data channel #1 in the time domain, the interval between the last symbol of the DL data channel #2 and the start symbol of the UL data channel is equal to or greater than the interval set by the base station, How the terminal operates. As a method of operating a base station in a communication system,
Transmitting DL data #1 to a terminal through a downlink (DL) data channel #1;
Transmitting DL data #2 to the terminal through DL data channel #2;
Considering the size of the hybrid automatic repeat request (HARQ) response #1 for the DL data #1 and the size of the HARQ response #2 for the DL data #2, generating UL scheduling information of an UL (uplink) data channel step;
Transmitting the UL scheduling information to the terminal; And
Receiving UL data, the HARQ response #1, and the HARQ response #2 in the UL data channel indicated by the UL scheduling information,
Each of the UL control channel #1 to which the HARQ response #1 is transmitted and the UL control channel #2 to which the HARQ response #2 is to be transmitted overlap the UL data channel. The method of claim 17,
When the priority of each of the DL data #1 and the DL data #2 is the same as the priority of UL data to be transmitted through the UL data channel, the HARQ response #1 and the HARQ response #2 are in the UL data channel. Multiplexed, method of operation of the base station. The method of claim 17,
When the UL data channel is transmitted based on a frequency hopping scheme, the HARQ response #1 is multiplexed on the UL data channel of hop #n, and the HARQ response #2 is the hop #m. It is multiplexed on a UL data channel, and each of the n and m is a different natural number. The method of claim 17,
When the UL data channel includes a plurality of UL data channel instances, the HARQ response #1 is multiplexed in UL data channel instance #n, and the HARQ response #2 is multiplexed in UL data channel instance #m. , Wherein each of the n and m is a different natural number.

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