KR20180108452A - Method and apparatus for transmitting and receiving uplink control channel in communication system - Google Patents

Abstract

A method and apparatus for transmitting and receiving an uplink control channel in a communication system are disclosed. A method for operating a terminal includes the steps of: receiving a downlink data channel from a base station in a slot #n or a slot #(n-l); receiving a slot format indicator indicating the format of a slot #(n+k) to which uplink control information is transmitted, from the base station in the slot #n; and transmitting the uplink control information including an HARQ response for the downlink data channel to the base station in the slot #(n+k). Therefore, the performance of the communication system can be improved.

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for transmitting and receiving an uplink control channel in a communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication technology, and more particularly, to a technique for transmitting and receiving an uplink control channel in a communication system.

The communication system may include a core network, a base station, a terminal, and the like. When downlink transmission is performed in the communication system, the base station can transmit a downlink signal (e.g., control information, data, reference signal) to the terminal. When uplink transmission is performed in the communication system, the terminal can transmit an uplink signal (e.g., control information, data, reference signal) to the base station.

Control information transmitted from a base station to a mobile station may be referred to as downlink control information (DCI), and control information transmitted from a mobile station to a base station may be referred to as uplink control information (UCI). The UCI may include at least one of a scheduling request (SR), a channel status information, and a hybrid automatic repeat request (HARQ) response.

Meanwhile, since a 5G communication system (e.g., a new radio system) supports dynamic time division duplex (TDD), beam-centric communication or low-delay communication, The number of uplink symbols allowed to transmit UCI may be variable. The number of uplink symbols allowed to transmit UCI may be limited. For example, when there are many downlink data, the number of uplink symbols allowed to transmit UCI may be relatively small. Therefore, it is necessary to transmit and receive an uplink control channel to support a case where the number of downlink symbols allowed to transmit UCI is variable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for transmitting and receiving an uplink control channel in a communication system.

According to another aspect of the present invention, there is provided a method of operating a terminal, comprising: receiving a downlink data channel from a base station in a slot #n or a slot #n; receiving a slot format indicator indicating a format of # (n + k) from the base station in the slot #n; and transmitting the uplink control information including an HARQ response for the downlink data channel to the slot # n + k, where n and k are integers greater than or equal to zero, and l is an integer greater than or equal to one.

Here, the slot format indicator indicates the format of the slots # (n + k) to # (n + k + j), and j may be an integer of 1 or more.

Here, format indicators for two or more different slots in the slot #n may be transmitted, and one of the two or more different slot format indicators may be transmitted in the format of the slot # (n + k) And the remaining slot format indicator may indicate the format of the slot that is contiguous with slot # (n + k).

Here, two or more different slot format indicators may be transmitted in the slot #n, and one of the two or more different slot format indicators may indicate the format of the slot # (n + k) And the remaining slot format indicator may be a slot format indicator transmitted through a slot prior to the slot #n, and the remaining slot format indicator indicates a format of a slot other than the slot # (n + k) .

Here, the slot format indicator may indicate the number of one or more symbols used for transmission of at least the uplink control information in the slot # (n + k).

Here, the slot format indicator may be received through the common control channel of the slot #n.

Here, a time interval between the slot #n and the slot # (n + k) may be a minimum time required to generate the HARQ response for the downlink data channel.

According to another aspect of the present invention, there is provided a method of operating a terminal, comprising: receiving a downlink data channel from a base station in a slot #n; (n + m) to slot # (n + m + k) repeatedly transmits the uplink data channel to the base station k times, and includes the HARQ response for the downlink data channel in the slot # And k is an integer equal to or greater than 1, and each of n, l and m is an integer equal to or greater than 0, and each of k and k 'is an integer equal to or greater than 1, and the uplink data channel And the uplink control information are simultaneously transmitted.

Here, if the uplink data channel and the uplink control information are simultaneously transmitted in the at least one slot, the uplink control information may be transmitted through the uplink data channel instead of the uplink control channel.

Here, the uplink control information may be transmitted through the punted RE among the REs set for the uplink data channel.

Here, if the uplink control information is mapped to one or more REs set for the uplink data channel, the uplink data may include one or more REs to which the uplink control information is mapped among REs set for the uplink data channel And the rate matching operation for the uplink data may be performed when the RE mapping operation is performed.

Here, there are p slots including a pending symbol among the slots # (n + 1) to (n + m + k '), and the pending symbol is a slot of the uplink data channel or the uplink control information The uplink data channel and the uplink control information may not be transmitted through the p slots, and the uplink data channel may be transmitted through slots # (n + 1) to (N + m + k + p), and the uplink control information can be transmitted k times in the slot # (n + m + k + p) P times, and p may be an integer of 1 or more.

Here, there are p slots including a pending symbol among the slots # (n + 1) to (n + m + k '), and the pending symbol is a slot of the uplink data channel or the uplink control information The uplink data channel and the uplink control information may not be transmitted through the p slots, and the uplink data channel may be transmitted through slots # (n + 1) to (N + m + k) times in the slot # (n + m + k), and the uplink control information may be repeatedly transmitted in the slot # '-p) times, and p may be an integer of 1 or more.

Here, the number k of repeated transmissions of the uplink data channel and the number k 'of repeated transmissions of the uplink control information may be set through at least one of an upper layer signaling procedure and a DCI transmission procedure.

According to another aspect of the present invention, there is provided a method of operating a terminal, comprising: receiving a downlink data channel from a base station in a slot #n; (n + m) to (n + m + k '), repeatedly transmitting uplink control information including an HARQ response for the downlink data channel to the base station, Wherein k and k 'are integers greater than or equal to 2, and each of k and k' is an integer greater than or equal to 2, The uplink control information and the uplink data channel are simultaneously transmitted.

Here, if the uplink control information and the uplink data channel are simultaneously transmitted in the at least one slot, the uplink control information may be transmitted through the uplink data channel instead of the uplink control channel.

Here, the uplink control information may be transmitted through the punted RE among the REs set for the uplink data channel.

Here, if the uplink control information is mapped to one or more REs set for the uplink data channel, the uplink data may include one or more REs to which the uplink control information is mapped among REs set for the uplink data channel And the rate matching operation for the uplink data may be performed when the RE mapping operation is performed.

Here, there are p slots including a pending symbol among the slots # (n + 1) to (n + m + k '), and the pending symbol is a slot of the uplink data channel or the uplink control information The uplink control information and the uplink data channel may not be transmitted through the p slots, and the uplink control information may be transmitted to the slots # (n + 1) to (N + m + k + p), and the uplink data channel can be transmitted k times in the slot # (n + m + P times, and p may be an integer of 1 or more.

Here, there are p slots including a pending symbol among the slots # (n + 1) to (n + m + k '), and the pending symbol is a slot of the uplink data channel or the uplink control information The uplink control information and the uplink data channel may not be transmitted through the p slots, and the uplink control information may be transmitted to the slots # (n + 1) to (N + m + k) times in the slot # (n + m + k), and the uplink data channel may be repeatedly transmitted in the slot # '-p) times, and p may be an integer of 1 or more.

According to the present invention, the L1 control information can be transmitted through the resources set for the downlink data channel. In this case, the L1 control information can be mapped to the RE neighboring the DM-RS. Therefore, the reception error of the L1 control information can be minimized, and the frequency multiplexing gain for the L1 control information can be obtained.

Also, the base station may transmit a preemption indicator indicating that the downlink data channel # 2 for the second terminal is transmitted through a preset resource among the resources set for the downlink data channel # 1 for the first terminal. The UE can generate an HARQ response for the downlink data channel # 1 based on the preemption indicator and transmit the generated HARQ response to the base station. Therefore, the resource utilization rate can be improved and the error for the HARQ response can be reduced.

Also, the UE can receive the downlink data channels # 1 and # 2, and repeatedly transmit HARQ responses # 1 and # 2 for the downlink data channel # 1 and # 2, respectively . HARQ responses # 1 and # 2 may be transmitted simultaneously through the same slot. Therefore, the reception error of the HARQ response can be reduced.

1 is a conceptual diagram showing a first embodiment of a communication system.
2 is a block diagram showing a first embodiment of a communication node constituting a communication system.
3 is a block diagram illustrating a first embodiment of a TB in a communication system.
4 is a block diagram illustrating a second embodiment of a TB in a communication system.
5 is a block diagram illustrating a third embodiment of a TB in a communication system.
6A is a conceptual diagram showing a first embodiment of a method of mapping L1 control information.
6B is a conceptual diagram showing a second embodiment of a method of mapping L1 control information.
7A is a conceptual diagram showing a third embodiment of a method of mapping L1 control information.
7B is a conceptual diagram showing a fourth embodiment of a method of mapping L1 control information.
8 is a conceptual diagram showing a first embodiment of a data channel.
9 is a conceptual diagram showing a first embodiment of an HARQ response in a communication system supporting CC.
10 is a conceptual diagram showing a first embodiment of an HARQ response codebook in a communication system supporting CC.
11 is a conceptual diagram showing a second embodiment of an HARQ response codebook in a communication system supporting CC.
12A is a timing chart showing a first embodiment of a method of transmitting uplink control information.
12B is a timing chart showing a second embodiment of a method of transmitting uplink control information.
13 is a timing diagram showing a first embodiment of HARQ response transmission in a communication system.
14A is a timing chart showing a first embodiment of a transmission method of an uplink channel in a communication system.
14B is a timing chart showing a second embodiment of a transmission method of an uplink channel in a communication system.
15A is a timing chart showing a third embodiment of a transmission method of an uplink channel in a communication system.
15B is a timing diagram showing a fourth embodiment of a transmission method of an uplink channel in a communication system.
15C is a timing chart showing a fifth embodiment of a transmission method of an uplink channel in a communication system.
16A is a timing chart showing a first embodiment of a transmission scheme of an uplink control / data channel in a communication system.
16B is a timing chart showing a second embodiment of a transmission scheme of an uplink control / data channel in a communication system.
16C is a timing chart showing a third embodiment of a transmission scheme of an uplink control / data channel in a communication system.
16D is a timing chart showing a fourth embodiment of a transmission scheme of an uplink control / data channel in a communication system.
17A is a timing chart showing a fifth embodiment of a transmission scheme of an uplink control / data channel in a communication system.
17B is a timing diagram showing a sixth embodiment of a transmission scheme of an uplink control / data channel in a communication system.
17C is a timing diagram showing a seventh embodiment of a transmission scheme of an uplink control / data channel in a communication system.
17D is a timing chart showing an eighth embodiment of a transmission scheme of an uplink control / data channel in a communication system.
18 is a timing chart showing a ninth embodiment of a transmission scheme of an uplink control / data channel in a communication system.
19 is a timing chart showing a sixth embodiment of a transmission method of an uplink channel in a communication system.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. 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 another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

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

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

A communication system to which embodiments of 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 following description, and the embodiments according to the present invention can be applied to various communication systems. Here, the communication system can be used in the same sense as a communication network.

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

1, a communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6. The communication system 100 also includes a core network (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway, a mobility management entity . When the communication system 100 is a 5G communication system (e.g., a new radio system (NR) system), the core network includes an access and mobility management function (AMF), a user plane function (UPF) . ≪ / RTI >

The plurality of communication nodes may support 4G communication (e.g., long term evolution (LTE), advanced (LTE-A)), 5G communication, etc. defined in the 3rd generation partnership project (3GPP) standard. 4G communication can be performed in a frequency band of 6 GHz or less, and 5G communication can be performed in a frequency band of 6 GHz or less as well as a frequency band of 6 GHz or more. For example, for 4G communication and 5G communication, a plurality of communication nodes may be classified into a code division multiple access (CDMA) based communication protocol, a wideband CDMA (WCDMA) based communication protocol, a time division multiple access (TDMA) A communication protocol based on FDMA (frequency division multiple access), a communication protocol based on orthogonal frequency division multiplexing (OFDM), a communication protocol based on Filtered OFDM, a communication protocol based on CP (cyclic prefix) A communication protocol based on Fourier transform-spread-OFDM), a communication protocol based on OFDMA (orthogonal frequency division multiple access), a communication protocol based on single carrier (SC) -FDMA, a non-orthogonal multiple access (NOMA) division multiplexing based communication protocol, FBMC (filter bank multi-carrier) based communication protocol, UFMC (universal filtered multi-carrier) based communication protocol, SDMA Division multiple access) -based communication protocol. Each of the plurality of communication nodes may have the following structure.

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

Referring to FIG. 2, the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to the network to perform communication. The communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each component included in the communication node 200 may be connected by a bus 270 and communicate with each other.

However, each component included in the communication node 200 may not be connected to the common bus 270 but may be connected to the processor 210 via an individual interface or a separate bus. For example, the processor 210 may be coupled to at least one of the memory 220, the transceiver 230, the input interface 240, the output interface 250 and the storage 260 via a dedicated interface .

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

Referring again to FIG. 1, the communication system 100 includes a plurality of base stations 110-1, 110-2, 110-3, 120-1, 120-2, a plurality of terminals 130- 1, 130-2, 130-3, 130-4, 130-5, and 130-6. The base stations 110-1, 110-2, 110-3, 120-1, and 120-2 and the terminals 130-1, 130-2, 130-3, 130-4, 130-5, The communication system 100 comprising 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 can belong to 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.

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1 and 120-2 includes a Node B, an evolved Node B, a gNB, an advanced base station A high reliability base station (HR-BS), a base transceiver station (BTS), a radio base station, a radio access station (RAS), a radio transceiver, an access point, Node, a relay, an advanced relay station (ARS), a high reliability-relay station (HR-RS), and the like. Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5 and 130-6 includes a user equipment (UE), a terminal, an access terminal, 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.

Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands, or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1 and 120-2 may be interconnected via an ideal backhaul link or a non-idle backhaul link , An idle backhaul link, or a non-idle 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 via an idle backhaul link or a non-idle 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 terminals 130-1, 130-2, 130-3, 130 130-2, 130-3, 130-4, 130-5, and 130-6, and transmits the signals received from the terminals 130-1, 130-2, 130-3, 130-4, Lt; / RTI >

In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 performs MIMO transmission (for example, SU (single user) -MIMO, MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, direct device to device communication (D2D) proximity services). Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 includes base stations 110-1, 110-2, 110-3, and 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 can 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 based on the SU-MIMO scheme And may receive a signal from the second base station 110-2. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO scheme, the fourth terminal 130-4, And the fifth terminal 130-5 may receive signals from the second base station 110-2 by the MU-MIMO scheme.

Each of the first base station 110-1, the second base station 110-2 and the third base station 110-3 can transmit a signal to the fourth terminal 130-4 based on the CoMP scheme, The terminal 130-4 can 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 includes terminals 130-1, 130-2, 130-3, 130-4 , 130-5, and 130-6) and the CA scheme. Each of the first base station 110-1, the second base station 110-2 and the third base station 110-3 controls the D2D between the fourth terminal 130-4 and the fifth terminal 130-5 And each of the fourth terminal 130-4 and the fifth terminal 130-5 can perform the D2D under the control of each of the second base station 110-2 and the third base station 110-3 .

Next, methods of transmitting and receiving an uplink control channel in a communication system will be described. Even if a method (e.g., transmission or reception of a signal) to be performed at the first communication node among the communication nodes is described, the corresponding second communication node is controlled by a method corresponding to the method performed at the first communication node For example, receiving or transmitting a signal). That is, when the operation of the terminal is described, the corresponding base station can perform an operation corresponding to the operation of the terminal. Conversely, when the operation of the base station is described, the corresponding terminal can perform an operation corresponding to the operation of the base station.

An NR system may support dual connectivity (DC) and carrier aggregation (CA) by operating one or more carriers. A physical channel on which a hybrid automatic repeat request (HARQ) response is transmitted and a physical channel on which a HARQ response is transmitted when one carrier is operated may be set as follows. Here, the HARQ response may be ACK (acknowledgment), NACK (negative ACK), or the like.

Communication can be performed in TB (transport block) units in the NR system, and the encoded TB can be referred to as CW (codeword). For example, the base station may transmit the CW to the terminal, and the terminal may receive the CW from the base station. If MIMO is used, the base station may send one or more CWs to the terminal. The UE can generate one HARQ response for each CW received.

When the communication between the base station and the UE is performed using one carrier, the UE can generate HARQ responses having a size of 1 bit or 2 bits. When the communication between the base station and the terminal is performed using a plurality of carriers, the terminal can generate an encoded HARQ response by encoding an HARQ response for a plurality of carriers. A base station may use a combination of a higher layer signaling procedure (e.g., a radio resource control (RRC) signaling procedure) or a combination of a higher layer signaling procedure and a downlink control information (DCI) transmission procedure to transmit a HARQ response (E.g., time-frequency resource information) to the terminal. The resource information used for transmission of the HARQ response may be a subframe index, a slot index, a sub-slot index, a mini-slot index, or a symbol index . The terminal may transmit an HARQ response using the resources indicated by the base station.

Here, the HARQ response may be included in the uplink control information, and the uplink control information may be transmitted through the uplink control channel (for example, the physical uplink control channel (PUCCH)). The uplink control channel may be composed of one or more symbols, and the consecutive symbols may be referred to as "UL slot "," UL subslot ", or "UL minislot ". In addition, the uplink control channel may consist of one or more UL slots, one or more UL subslots or one or more UL minislots. The base station can establish an uplink control channel for the UE using an upper layer signaling procedure. The UE can transmit uplink control information using the uplink control channel. The uplink control information may include at least one of an HARQ response, channel state information, and a scheduling request (SR). Also, the UE can transmit a BSR (buffer status report) using an uplink control channel.

Meanwhile, when the first terminal receives the downlink data channel # 1 from the base station and the second terminal receives the downlink data channel # 2 from the base station, the transmission / reception methods of the uplink control channel (for example, UCI) May be performed according to the following embodiments.

The downlink data channel # 1 and the downlink data channel # 2 use the same time-frequency resource and the priority of the data belonging to the downlink data channel # 1 is lower than the priority of the data belonging to the downlink data channel # , The base station may not transmit a part or all of the downlink data channel # 1 to the first terminal and may transmit the downlink data channel # 2 using time-frequency resources not occupied by the downlink data channel # To the second terminal. In this case, the base station transmits information (hereinafter, referred to as "preemption indicator") indicating that some or all of the resources set for the downlink data channel # 1 are used for transmission of the downlink data channel # 2 ) To the first terminal through the downlink control channel, and the first terminal can generate the uplink control information based on the information obtained through the downlink control channel. For example, the first terminal can identify a time-frequency resource in which the downlink data channel # 1 is transmitted based on the information obtained through the downlink control channel, To generate an HARQ response for channel # 1.

■ How to create TB and coded block group (CBg)

When downlink transmission is performed, the TB may be generated by a medium access control (MAC) layer of the base station, and the TB may be generated by the MAC layer of the terminal when uplink transmission is performed.

3 is a block diagram illustrating a first embodiment of a TB in a communication system.

Referring to FIG. 3, the TB 300 may include a MAC sub-header 310 and a MAC CE (control element) 320. The TB 300 including the MAC subheader 310 and the MAC CE 320 may be referred to as "Type-1 TB ". The MAC subheader 310 may be concatenated to the MAC CE 320. The TB 300 may include a MAC header in place of the MAC subheader 310. That is, the TB 300 may include a MAC header and a MAC CE 320.

4 is a block diagram illustrating a second embodiment of a TB in a communication system.

Referring to FIG. 4, the TB 400 may include a MAC sub-header 410 and a MAC SDU (service data unit) 420. The TB 400 including the MAC subheader 410 and the MAC SDU 420 may be referred to as "Type-2 TB ". The MAC subheader 410 may be concatenated with the MAC SDU 420. The TB 400 may include a MAC header in place of the MAC subheader 410. That is, the TB 400 may include a MAC header and a MAC SDU 420.

On the other hand, one TB can be segmented into a plurality of CBs. The CBg may include one or more CBs. For example, the MAC layer may divide the TB into a plurality of CBs, and may append a cyclic redundancy check (CRC) field to each CBg. CBg can be generated according to the size of the TB. If the size of the TB is greater than a predefined size (e.g., a size defined in the 3GPP TS (technical specification)), the TB may be divided into one or more CBgs. Also, a filler bit may be attached to the CBg as needed. If the size of the TB is smaller than a predefined size (e.g., a size defined in the 3GPP TS), the TB may include one CBg. That is, one TB can be set to one CBg. In this case, a CRC field for TB may be generated instead of a CRC field for CBg.

Since the number of CBs constituting the TB varies depending on the size of the TB, the number of HARQ responses may also be variable. For example, if an HARQ response is generated for each CBg, the number of HARQ responses may also increase as the number of CBg increases. Since the UE can know the size of the TB based on the downlink scheduling information, the UE can know the number of HARQ responses for the TB. In a communication system supporting CA or time division duplex (TDD), a UE can generate a plurality of HARQ responses according to a plurality of downlink scheduling information. The number of HARQ responses generated by the UE may vary depending on the number of discontinuous transmissions (DTx).

Meanwhile, as another method of generating the CBg, the base station can inform the terminal of the number of CBgs through an upper layer signaling procedure. In this case, the terminal can generate CBg as many as the number of CBg indicated by the base station. Therefore, the number of CBs may be kept constant regardless of the size of TB, and the number of HARQ responses may not be changed since the number of CBs is kept constant. The number of CBs belonging to the CBg may be varied in order to keep the number of CBg constant even if the TB size is different. For example, when the size of TB is small, the number of CBs constituting one CBg may decrease, and when the size of TB is large, the number of CBs constituting one CBg may increase.

If the size of TB is small, the number of CBs need not be large. Since the size of the TB for the system information is not large and the system information is transmitted in a broadcast manner from the base station, a method of deriving the number of CBs equally from the UEs may be required. In this case, the number of CBs may not be set by an upper layer signaling procedure. The base station can schedule a downlink data channel using a specific downlink control information format. The terminal, which has received the specific downlink control information format, can allocate a downlink data channel according to the size of a TB indicated by a specific downlink control information format The number of CBs can be determined. Therefore, the UE can generate CBg as many as the number of CBg determined by the specific DL control information format.

The one or more CBGs belonging to the downlink (or uplink) data channel # 1 may be configured as a downlink (or uplink) data channel # 1, Link) data channel # 2. When a retransmission procedure of the downlink (or uplink) data channel # 1 is performed, a retransmission procedure for the entire CBg or a part CBg belonging to the downlink (or uplink) data channel # 1 may be performed. When a part of CBg belonging to the downlink (or uplink) data channel # 1 is retransmitted, the number of CBg retransmitted may be larger than the number of CBg occupied by the downlink (or uplink) data channel # 2 . When a CBg is mapped to resource elements (REs) of a plurality of minislots, even when a downlink (or uplink) data channel # 2 is transmitted through one minislot, Link) CBg belonging to data channel # 1 can be mapped to a plurality of minislots.

On the other hand, as another method of generating CBg, CBg can be generated based on the size of TB as well as the RE mapping method considering the boundaries of minislots. If CBg is generated in units of "Type-1 TB" units, "Type-2 TB" units or "Type-1 TB + Type-2 TB", CBg can be mapped to REs to fit the minislot boundaries . In this case, the MAC layer may map one CBg to one or more minislots. Alternatively, the MAC layer may map a plurality of CBs to one minislot. If the base station is configured with a relatively small number of symbols in the mini-slot of the downlink (or uplink) data channel # 2, CBg may be generated in units of a minimum minislot (for example, one symbol unit) have. Alternatively, CBg may be generated considering the boundaries of one or more minislots instead of the minimum minislot unit. When only one terminal transmits and receives the uplink (or downlink) data channel # 2 to and from the base station, the other terminals belonging to the base station are also one CBg can be generated on a symbol-by-symbol basis. To reduce this overhead, the MAC layer may map CBg to fit the boundary of one or more minislots.

In order to improve the processing speed in the MAC layer of the receiving end and to reduce the overhead of the soft buffer in the PHY layer of the receiving end, a separate MAC header may not be generated in the TB, And "Type-2 TB ". The method of generating a separate MAC header may be a method of attaching CRC fields to each of CBg belonging to TB and TB. In this case, since the MAC layer can report the reception success of the TB to an upper layer (for example, an IP (internet protocol) layer) only when the CRC for the received TB is successful, The received signal can be stored in the soft buffer until all of them succeed. If retransmission is allowed independently for each CBg, the CBg that succeeded in CRC can be stored in the soft buffer. Since the overhead increases when the CBg succeeding the CRC is stored in the soft buffer, the CBg succeeding the CRC can be reported to the MAC layer. To support this function, the CRC field for TB may be omitted and only the CRC field for CBg may be generated.

A TB that does not include a separate MAC header may be generated, and the TB may be divided into one or more CBgs. If the CBG succeeding the CRC is reported to the MAC layer, the CBg succeeding the CRC may not be stored in the soft buffer, and the retransmission procedure is performed in units of CBg until the CRC for the TB is succeeded by the reception of the MAC header . The TB can be obtained by sequentially rearranging the CBg received by the retransmission procedure.

TB generated according to the embodiments described above may be as follows.

5 is a block diagram illustrating a third embodiment of a TB in a communication system.

Referring to FIG. 5, a TB may include a plurality of MAC units. Each of the plurality of MAC units may be "Type-1 TB" shown in FIG. 3 or "Type-2 TB" shown in FIG. One MAC unit may include one or more CBgs, and one CBg may be mapped to one or more minislots. In this case, one CBg may be mapped to the RE to fit the boundary of one or more minislots. Also, CBg can be mapped in the scheduled bandwidth.

When the CRC field and the MAC header for the TB are set, the CRC field of the TB may be located in the foremost region or the back region within the TB, and the MAC header of the TB may be located in the foremost region or the backmost region within the TB Can be located. The CRC field of the TB may be derived by a MAC header and a payload.

■ How to send control information

The base station can transmit the downlink data channel using the MAC CE to transmit the control information used in the MAC layer. Also, the UE can transmit the uplink data channel using the MAC CE to transmit the control information used in the MAC layer. The control information may belong to the TB and may be involved in the generation of the CBg. On the other hand, the transmission resource for the control information used in the physical layer can be allocated by the scheduler instead of the MAC layer of the base station. Therefore, the control information used in the physical layer can be transmitted through the downlink control channel or the uplink control channel.

When the transmission capacity of the control channel is limited and the amount of control information is large, the control information used in the physical layer can be transmitted through the data channel. Therefore, it may be necessary to define the control information transmitted through the data channel without involving the MAC layer. For example, the control information transmitted through the data channel without involvement of the MAC layer includes activation / deactivation information of aperiodic CSI-RS, management information of beam correspondence, the size of the physical resource block (PRB) bundle of the downlink control channel, the resource information for interference measurement, the RSRP of the virtual sector (e.g., beam) a reference signal received power, a CSI (e.g., a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator, a CSI-RS resource indicator (CRI) have. This control information can be referred to as "L1 control information ", and a plurality of" downlink control information types "can be defined according to the type of L1 control information included in the downlink control information, A plurality of "uplink control information types" may be defined according to the type of L1 control information to be transmitted. In the following embodiments, the L1 control information may be used in the same meaning as the downlink control information type (or the uplink control information type). For example, the L1 control information may indicate the DL control information type or the UL control information type, and the DL control information type or the UL control information type may indicate the L1 control information.

When a resource allocation operation for the UE is performed, the scheduler of the base station can inform the UE of the resource information occupied by the TBs or CBgs for the data channel using the downlink control information. In addition, the scheduler of the base station can allocate resources for transmission of L1 control information in the resources for the data channel and inform the terminal of the resource information allocated for the L1 control information. Alternatively, the base station may transmit the downlink control information type to the terminal without requesting resource allocation of the data channel for the terminal, and may request the terminal to transmit the uplink control information type.

The modulation order and the code rate for the L1 control information can be defined in the 3GPP TS. Alternatively, the base station may transmit downlink control information indicating the modulation order and coding rate for the L1 control information to the UE. For example, the modulation order of the L1 control information may be quadrature phase shift keying (QPSK), and the coding rate of the L1 control information may be an offset relative to the coding rate of the data channel scheduled by the downlink control information Can be instructed.

The base station can inform the terminal of the downlink control information type (or uplink control information type) together with the resource allocation information of the data channel using the downlink control information. The size of the L1 control information can be defined in the 3GPP TS. Alternatively, the base station may inform the terminal of the size of the L1 control information through an upper layer signaling procedure. Therefore, the UE allocates L1 control information in the resource set for the data channel based on the type of the L1 control information confirmed by the DL control information type or the UL control information type, the modulation order of the L1 control information, You can see the resources that have been created. In this case, the UE can perform the RE demapping operation on the downlink control information type in the identified resource, and perform the RE mapping operation on the UL control information type in the confirmed resource. The RE mapping operation and the rate matching operation for the data channel may be performed based on resources not occupied by the L1 control information among the resources allocated for the data channel.

When the L1 control information is mapped to the RE along with the data channel, a method for minimizing errors in the base station or the terminal will be required. To minimize the reception error of the L1 control information, the L1 control information may be mapped to an RS (demodulation-reference signal), for example, to obtain a frequency multiplexing gain as in the following embodiments.

FIG. 6A is a conceptual diagram showing a first embodiment of a method of mapping L1 control information, and FIG. 6B is a conceptual diagram showing a second embodiment of a method of mapping L1 control information.

Referring to FIGS. 6A and 6B, one slot may include four minislots, and may be used for downlink transmission or uplink transmission. CBg # 1 to # 3 may belong to the data channel and may be set within the scheduled bandwidth. 6A, CB for L1 control information may be mapped to all minislots belonging to one slot, and CB for L1 control information may be mapped to neighboring REs (e.g., DM-RS) . In Fig. 6B, CB for L1 control information may be mapped to some minislots, and CB for L1 control information may be mapped to an adjacent RE to RS (e.g., DM-RS).

If CB for L1 control information is mapped to RE close to the DM-RS for the data channel, error due to the channel interpolation operation after the channel estimation can be reduced. In a communication system supporting MIMO that transmits two or more layers, the RE mapping scheme of the L1 control information described above can be applied. For example, the L1 control information can be mapped to RE only in one layer. In this case, the base station can inform the terminal of the layer to which the L1 control information is mapped by using the downlink control information including the resource allocation information of the data channel. Therefore, the UE receiving the downlink control information can identify the layer to which the L1 control information is mapped, and can perform demapping or mapping operation with respect to the L1 control information in the identified layer. Alternatively, the base station can inform the terminal of the port information about the layer to which the L1 control information is mapped using the downlink control information. The UE can change the layer according to an instruction from the base station, so that a spatial diversity gain can be obtained.

Alternatively, the L1 control information may be mapped to all layers to which the data channel is transmitted. In this case, since the resources available for transmission of the data channel are reduced, the coding rate of the data channel can be increased. Therefore, the base station can determine the size of the resource allocated for the data channel in order to maintain a proper coding rate.

The reception of the L1 control information can be reduced by acquiring the frequency diversity gain. Thus, the L1 control resource may be transmitted over two or more frequency resources (e.g., frequency bands, subcarriers) within the scheduled bandwidth for the data channel.

■ Type of L1 control information (for example, DCI  Type or UCI  Type) Mapping  Way

Each of the downlink control information types may have different priorities, and each of the uplink control information types may have different priorities. Therefore, the location of the RE mapping may be changed according to the priority of the downlink control information type or the uplink control information type.

If the size and position of the resources occupied by the L1 control information are the same in the scheduled resource for the data channel, the DCI type (or uplink control information type) having the highest priority may be first mapped to RE , And thereafter a downlink control information type (or uplink control information type) having a relatively low priority may be mapped to RE. In this case, the DL control information type (or the UL control information type) having a high priority can be mapped to an RE close to the RS (for example, DM-RS) relatively. Therefore, Reception errors of the link control information type (or uplink control information type) can be reduced.

On the other hand, if L1 control information is allocated only to the REs surrounding the RS, and there is no data to be transmitted, since no signal is transmitted through the REs other than the REs to which the RSs and the L1 control information are allocated, can do. In order to solve this problem, the L1 control information having a relatively low priority as in the following embodiments can be mapped to an RE other than the RE around the RS.

FIG. 7A is a conceptual diagram showing a third embodiment of a method of mapping L1 control information, and FIG. 7B is a conceptual diagram showing a fourth embodiment of a method of mapping L1 control information.

Referring to FIGS. 7A and 7B, one slot may include four minislots, and a data channel may not be transmitted within one slot. In FIG. 7A, a CB for high priority L1 control information may be mapped to all minislots belonging to one slot and may be mapped to an adjacent RE with an RS (e.g., DM-RS) . On the other hand, a CB for L1 control information having a low priority can be mapped to all minislots belonging to one slot and mapped to REs other than REs around the RS (for example, DM-RS) .

In FIG. 7B, a CB for high priority L1 control information may be mapped to some minislots and may be mapped to an adjacent RE to a RS (e.g., DM-RS). On the other hand, a CB for low priority L1 control information may be mapped to some minislots and may be mapped to REs other than REs around the RS (e.g., DM-RS).

Although the mapping methods of the L1 control information described above have been described with reference to one slot or one minislot, the L1 control information may be mapped to the RE to fit the boundaries of the plurality of slots or the plurality of minislots.

Meanwhile, when the UE transmits aperiodic CSI to the base station, four uplink control information types (e.g., uplink control information type-1, uplink control information type-2, uplink control information type- 3 and uplink control information type -4) may exist. Each of the four UL control information types may have different priorities, and the RE mapping method of the UL control information type may differ according to the priority. An uplink control information type including at least one of RI and CRI may be mapped to an RE around the DM-RS, and an uplink control information type including at least one of CQI and PMI may be mapped to a non- It can be mapped to another RE. That is, the L1 control information having a low priority (for example, the DCI type or the UL control information type) may be mapped to an RE other than the RE around the DM-RS. Alternatively, when only one DCI type or uplink control information type exists, the L1 control information (e.g., the DCI type or the UL control information type) is not limited to the RE around the DM-RS, Can also be mapped to other REs.

CBg-based TB transmission method

8 is a conceptual diagram showing a first embodiment of a data channel.

Referring to FIG. 8, a plurality of TBs can be set within a system bandwidth, and each of a plurality of TBs can be set in one slot. TB may include one or more CBgs, and one CBg may be mapped to one or more minislots. For example, TB # 3 may include three CBs. When one slot includes four mini-slots, CBg # 1 of TB # 3 may be mapped to minislot # 0-1, and CBg # 2 of TB # 3 may be mapped to minislot # 1-2 And CBg # 3 of TB # 3 may be mapped to minislot # 3. When a downlink transmission is performed, the TB can be transmitted through the downlink data channel, and the slot in which the TB is set can be referred to as a "DL slot ". When an uplink transmission is performed, the TB can be transmitted on the uplink data channel, and the slot in which the TB is set can be referred to as "UL slot ".

The base station may transmit the TB to the terminals (e.g., the first terminal, the second terminal) using the downlink data channel. The downlink data channel established for the first terminal may be referred to as "downlink data channel # 1" and the downlink data channel established for the second terminal may be referred to as "downlink data channel # 2 ". The downlink data channel may belong to one slot regardless of the slot type (e.g., DL slot, DL-centric slot, etc.), and one TB may be transmitted in one slot. Frequency hopping may be performed for each minislot according to the RRC setting of the base station or DCI.

When the resource to which the TB # 3 is mapped is set to the downlink data channel # 1, the downlink data channel # 2 can be transmitted through one or more minislots belonging to the TB # 3. If the priority of the downlink data channel # 2 is higher than the priority of the downlink data channel # 1, the downlink data channel # 1 may not be transmitted through some of the resources to which the TB # 3 is mapped. In this case, the base station may transmit information (i.e., a preemption indicator) indicating that the downlink data channel # 1 is not transmitted through some of the resources set for the downlink data channel # 1 to the first terminal. That is, the preemption indicator may indicate that downlink data channel # 2 is transmitted through some of the resources set for downlink data channel # 1.

The preemption indicator may indicate the location of a physical resource for which downlink data channel # 1 is not transmitted (i.e., the location of a physical resource for which downlink data channel # 2 is transmitted). For example, the preemption indicator may indicate time-frequency resource information of a particular slot, time-frequency resource information of one or more minislots within a particular slot, and so on. Here, the time resource information of the slot (or minislot) may be a slot index (or minislot index), and the frequency resource information of the slot or minislot may be a subcarrier index, a subband index, a PRB, or the like.

The first terminal can receive the preemption indicator from the base station and can determine that the downlink data channel # 2 is transmitted through some of the resources set for the downlink data channel # 1 based on the preemption indicator. When the downlink data channel # 1 is received, the first terminal can generate an HARQ response for the downlink data channel # 1. The size of the HARQ response may vary depending on the rank. For example, if the rank is 1, 2, 3 or 4, the size of the HARQ response may be 1 bit. If the rank is 5, 6, 7, or 8, the size of the HARQ response may be 2 bits. The UE can generate one HARQ response bit per TB or CBg.

(1) Transmission method 1 of HARQ response (hereinafter referred to as "method 1 &

The base station can inform the first terminal of the number of CBs constituting the TB. For example, the base station can inform the first terminal of the number of CBs constituting the TB by using a "higher layer signaling procedure" or a "combination of higher layer signaling procedure and DCI transmission procedure ". Here, the DCI may include resource allocation information of the downlink data channel # 1. In method 1, the preemption indicator may not be used. That is, the base station may not transmit a preemption indicator indicating the transmission of the downlink data channel # 2 to the terminal. Alternatively, even when a preemption indicator indicating the transmission of the downlink data channel # 2 is received from the base station, the first terminal can generate the HARQ response without considering the preemption indicator.

The first terminal can generate the HARQ response of the downlink data channel # 1 on a CBg basis regardless of reception of the preemption indicator. The size of the HARQ response (e.g., 1 bit or 2 bits) may vary depending on the rank. The first MS can transmit an HARQ response to the BS using the uplink control channel. For example, if TB # 1 of FIG. 8 includes L CBg, TB # 2 of FIG. 8 includes M CBg, and TB # 3 of FIG. 8 includes N CBg, 3, the first terminal can generate "L + M + N" HARQ responses.

In a communication system supporting MIMO, TDD, CA, or DC, a first terminal may transmit HARQ responses of a plurality of downlink data channels # 1 through one uplink control channel. Here, the number of HARQ responses generated by the first terminal may correspond to the number of CBs belonging to the plurality of downlink data channels # 1.

■ transmission method 2 (hereinafter referred to as "Method 2") of the HARQ response: the way pop that does not generate / send the response to the HARQ chyeoring (punctured) CBg.

The base station may transmit a preemption indicator indicating the transmission of the downlink data channel # 2 to the first terminal and may transmit the downlink data channel # 1 to the first terminal. The first UE receiving the downlink data channel # 1 may generate the HARQ response of the downlink data channel # 1 on a TB or CBg basis. In this case, the first terminal can generate the HARQ response in consideration of the preemption indicator received from the base station.

Specifically, the first terminal may generate an HARQ response of downlink data channel # 1 on a CBg basis in a resource (e.g., slot, minislot) indicated by the preemption indicator, The HARQ response of the downlink data channel # 1 can be generated on a TB basis in a resource other than the resource. The first MS can transmit the generated HARQ response to the BS through the uplink control channel corresponding to the downlink data channel # 1.

For example, if TB # 1 of FIG. 8 includes L CBg, TB # 2 of FIG. 8 includes M CBg, and TB # 3 of FIG. 8 includes N CBg, 3 can generate a 1-bit HARQ response to TB # 1, a 1-bit HARQ response to TB # 2, and a 1-bit HARQ response to TB # 3. The first MS can transmit a HARQ response of "1 + 1 + 1" bits to the BS through the uplink control channel. Here, since the first terminal does not know transmission related information (e.g., modulation order, coding rate, etc.) of the downlink data channel # 2, it can be regarded as only receiving the downlink data channel # CBg for # 1 can be demodulated.

■ transmission method of the third HARQ response (hereinafter referred to as "Method 3"): a method of considering the granularity (granularity) of the HARQ response to a puncturing CBg.

The base station may transmit a preemption indicator indicating the transmission of the downlink data channel # 2 to the first terminal and may transmit the downlink data channel # 1 to the first terminal. The first UE receiving the downlink data channel # 1 may generate the HARQ response of the downlink data channel # 1 on a TB or CBg basis. In this case, the first terminal can generate the HARQ response in consideration of the preemption indicator received from the base station.

Specifically, the first terminal can divide the TB received in the slot indicated by the preemption indicator into a plurality of CBgs, and can generate an HARQ response of each of the plurality of CBgs. For example, if TB # 1 of FIG. 8 includes L CBg, TB # 2 of FIG. 8 includes M CBg, TB # 3 of FIG. 8 includes N CBg, # 2, the first UE having received TB # 1-3 transmits a 1-bit HARQ response to TB # 1, an M-bit HARQ response to TB # 2, and a 1-bit HARQ You can generate a response. The first MS can transmit a HARQ response of "1 + M + 1" bits to the BS through the uplink control channel.

On the other hand, the "transmission method of the HARQ response" may vary depending on the specificity of the information indicated by the preemption indicator.

■ Transfer Method 4 (hereinafter referred to as "method 4") of the HARQ response: do not generate a response to the HARQ CBg indicated by the occupancy indicator / transmission.

When the preemption indicator indicates slot # 2 in FIG. 8, the first terminal may not generate HARQ responses for CBgs belonging to downlink data channel # 1 received in slot # 2 "). In case of "Method 4 ", HARQ responses for CBg received through slot # 2 in FIG. 8 may not be transmitted.

In the case of method 4, the downlink data channel # 1 received through slot # 2 in FIG. 8 may include three CBgs, three CBgs transmitted in seconds may not be stored in the buffer, HARQ combining for the three retransmitted CBs may not be performed. The operation described above can be applied to the case where the downlink data channel # 1 is allocated by the downlink control information or the downlink data channel # 1 is allocated by the L1 activation. The first MS does not transmit a part or all of the uplink control channel including only the HARQ response bit indicating NACK, thereby not interfering with other MSs. In addition, when the size of a HARQ codebook (e.g., HARQ ACK codebook) used in a communication system supporting TDD, CA, or DC decreases, the reception quality of the UL control channel can be improved.

■ Transfer method 5 of the HARQ response (hereinafter referred to as "method 5") may be the HARQ response fixing the HARQ response to CBg indicated by the occupancy indicator generated (for example, NACK or ACK) / transfer. Alternatively, when the preemption indicator indicates the slot # 2 in FIG. 8, the first UE transmits a HARQ response (for example, a fixed HARQ response in the HARQ response to the CBg belonging to the downlink data channel # 1 received in the slot # NACK or ACK) (i. E., "Method 5"). In the case of "Method 5 ", a NACK may be transmitted in the HARQ response to the CBg received through slot # 2 in FIG.

Transmitting a NACK for the CBg indicated by the preemption indicator may be overhead, but the base station receiving the NACK from the first terminal may determine that the preemption indicator is successfully received at the first terminal. The HARQ combining method in "method 5 " may be the same as the HARQ combining method in" method 4 ".

When a first terminal that performs communication using one carrier transmits 1-bit uplink control information on an uplink control channel (for example, in a case where the LTE communication system considers PUCCH format 1 / 1a / 1b , The first UE using method 4 may not transmit the uplink control channel and the first UE using method 5 may transmit the NACK on the uplink control channel. In a communication system supporting TDD, CA, or DC, when the first UE transmits uplink control information of 2 bits or more on the uplink control channel, the first UE using "method 5 & Bit, and can map the encoded HARQ response bits to the UL control channel.

On the other hand, the preemption indicator may be a bitmap indicating a resource to which the downlink data channel # 2 is transmitted. The bitmap may indicate at least one of time resources (e.g., slots, minislots, symbols, etc.) and frequency resources (e.g., subbands, subcarriers, etc.). For example, if the preemption indicator indicates slot # 2 and 0, 0, 1, 0 in FIG. 8, 0,0,1,0 may indicate minislot # 0-3 belonging to slot # 2 , The downlink data channel # 2 can be transmitted in the minislot # 2 indicated by "1 ".

The first terminal receiving the preemption indicator can determine that the CBg (for example, CBg # 2) received in the mini slot # 2 of the slot # 2 is the downlink data channel # 2. When the CBg # 1 is received in the mini-slot # 0-1 of the slot # 2, the first UE can generate the HARQ response for the CBg # 1. When CBg # 3 is received in the mini slot # 3 of the slot # 2, the first UE can generate an HARQ response for the CBg # 3. The first terminal may not generate an HARQ response for CBg # 2 received in minislot # 2 of slot # 2 (i.e., "Method 4"). Alternatively, the first terminal may generate a fixed HARQ response (e.g., NACK or ACK) in HARQ response to CBg # 2 received in minislot # 2 of slot # 2 (i.e., ).

The first terminal may transmit an HARQ response for the CBg received through the slot # 2 to the base station through the uplink control channel. In case of "Method 4 ", the first terminal can transmit the HARQ response to CBg # 1 + the HARQ response to CBg # 3 to the base station. In case of Method 5, the first terminal may transmit a HARQ response to CBg # 1 + a fixed HARQ response to CBg # 2 + a HARQ response to CBg # 3 to the base station.

If CBg # 2 is data transmitted for a second time, the terminal may not store CBg # 2 in the buffer. If CBg # 2 is the retransmitted data, the UE may not perform HARQ combining on the CBg # 2 already stored in the buffer and the retransmitted CBg # 2. When the HARQ response for CBg # 2 is generated in method 4, the transmission time of the HARQ response to CBg # 2 may be different from the transmission time of HARQ responses for CBg # 1 and # 3. The transmission time point of the HARQ response to CBg # 2 may be set based on the downlink control information indicating retransmission of CBg # 2.

■ transmission method 6 (hereinafter referred to as "method 6") of the HARQ response: can transmit among CBg belonging to TB except CBg indicated by the occupancy indicator HARQ response for the rest of CBg by bundling (bundling) method . When a fixed HARQ response for CBg # 2 is generated in the "method 5 ", a fixed HARQ response can be transmitted at a predefined time point. In the case of method 6, the first UE can generate one HARQ response by performing a logical AND operation on the HARQ response of CBg # 1 and the HARQ response of CBg # 3, (I.e., the bundled HARQ response) to the base station through the uplink control channel.

According to the " method 6 ", even if the first terminal does not receive the preemption indicator, the size of the HARQ response codebook can be maintained. Also, the first terminal transmits 1-bit or 2-bit uplink control information through the uplink control channel allocated by the base station, thereby reporting the decoded results for CBg # 1 and # 3 other than CBg # 2 to the base station can do.

If the fixed HARQ response to CBg # 2 is a NACK and the base station receives an ACK from the first terminal, the base station can determine that the HARQ responses for CBg # 1 and 3 are both ACK. On the other hand, when the NACK is received from the first UE, the BS may not be able to distinguish the CBg with the NACK from the HARQ response. The base station can receive the HARQ response of CBg # 2 at a transmission time different from the transmission time of the HARQ responses of CBg # 1 and # 3. The transmission time point of the HARQ response to CBg # 2 may be set based on the downlink control information indicating retransmission of CBg # 2.

On the other hand, the preemption indicator may include bitmap (i.e., 0, 0, 1, 0) and frequency resource information indicating a minislot belonging to slot # 2 and slot # 2 in FIG. In this case, the first UE transmits the downlink data channel # 1 (for example, CBg belonging to the downlink data channel # 1) and the downlink data channel # 2 (for example, And CBgs belonging to the downlink data channel # 2).

If the collided CBg is the data transmitted for a second, the first UE may not store the CBg in the buffer. Alternatively, if the collided CBg is retransmitted data, the first UE may not perform HARQ combining on the CBg. Also, the first terminal may not generate an HARQ response for the collided CBg. On the other hand, if the non-collided CBg is the data transmitted for a second time, the first UE can store the corresponding CBg in the buffer. Alternatively, if the non-collided CBg is the retransmitted data, the first UE can perform HARQ combining for the CBg. Also, the first terminal may generate an HARQ response to the unblocked CBg.

Method 4 "," Method 5 ", or" Method 6 "may be used when the specific CBg transmitted from the base station is not received at the first terminal by the downlink data channel # 2 and the decoding of the particular CBg is not required . In "Method 4 ", if the specific CBg is data transmitted in a second time, the first terminal can store a specific CBg in the buffer. On the other hand, if the specific CBg is the retransmitted data in the "method 4 ", the first terminal may not perform the HARQ combining for the specific CBg. Also, the first terminal may not generate an HARQ response for a specific CBg.

In method 5, the first terminal may generate a fixed HARQ response for a particular CBg. If the specific CBg is the data transmitted a second time, the first terminal may not store the specific CBg in the buffer. If the specific CBg is retransmitted data, the first terminal may not perform HARQ combining for a specific CBg.

In the " method 6 ", the first UE can generate one HARQ response by performing a logical AND operation on the HARQ responses of the remaining CBgs excluding the specific CBg among all the CBgs belonging to the TB. If the specific CBg is the data transmitted a second time, the first terminal may not store the specific CBg in the buffer. If the specific CBg is retransmitted data, the first terminal may not perform HARQ combining for a specific CBg. The base station can receive the HARQ response of CBg # 2 at a transmission time different from the transmission time of the HARQ responses of CBg # 1 and # 3. The transmission time point of the HARQ response to CBg # 2 may be set based on the downlink control information indicating retransmission of CBg # 2.

On the other hand, control information indicating a CBg index (hereinafter referred to as a "collision CBg index") belonging to the downlink data channel # 1 colliding with the downlink data channel # 2 may be transmitted through the downlink control channel. The control information indicating the collision CBg index can be distinguished from the preemption indicator and the downlink control information indicating the retransmission of the specific CBg. When control information indicating the collision CBg index (i.e., CBg # 2) is received, the first UE can generate HARQ responses by performing a decoding operation on CBg # 1 and # 3, The decoding operation may not be performed. In this case, "Method 4 "," Method 5 "or" Method 6 " If the CBg corresponding to the collision CBg index is data transmitted a second time, the first UE may not store the CBg in the buffer. Alternatively, if the CBg corresponding to the collision CBg index is retransmitted data, the first UE may not perform HARQ combining on the CBg.

In method 4, the first terminal may not generate an HARQ response for CBg corresponding to the collision CBg index. In "method 5 ", the first UE can generate a fixed HARQ response in the HARQ response to CBg corresponding to the collision CBg index. In the " method 6 ", the first UE can generate one HARQ response by performing a logical AND operation on the HARQ responses of the CBg other than the CBg corresponding to the collision CBg index among all the CBgs belonging to the TB. The base station can receive the HARQ response of CBg # 2 at a transmission time different from the transmission time of the HARQ responses of CBg # 1 and # 3. The transmission time point of the HARQ response to CBg # 2 may be set based on the downlink control information indicating retransmission of CBg # 2.

Meanwhile, when the above-described embodiments are applied to a communication system supporting CA, a base station can configure one or more CBgs for each CC, and one or more CBgs can be transmitted through a downlink data channel. The embodiments described above can be applied not only to the communication system supporting the CA but also to the communication system supporting the TDD. In this case, the slot index can correspond to the CC index.

9 is a conceptual diagram showing a first embodiment of an HARQ response in a communication system supporting CC.

9, five CCs (e.g., CC # 0 to # 4) can be set, one CBg can be set in CC # 0, and two CBgs in CC # Three CBgs can be set in CC # 2, one CBg in CC # 3 can be set, and four CBgs in CC # 4 can be set. The CCs # 0 to # 4 may be set by an "upper layer signaling procedure" or a "combination of an upper layer signaling procedure and a downlink control information transmission procedure ".

The base station can transmit 11 CBg through the downlink data channel. Here, the CBg denoted by A (ACK) may indicate a CBg successfully received from the first UE among the CBg received through the downlink data channel # 1, and the CBg denoted by N (NACK) And CBg which is not successfully received from the first terminal among the CBg received through # 1. The CBg indicated as M (missing) is allocated to a CBg not transmitted through the downlink data channel # 1 (for example, a resource is occupied by CBg transmitted through the downlink data channel # 2, CBg < / RTI > that could not be transmitted). When a preemption indicator indicating the CBg indicated by M is received from the base station, the first terminal can distinguish CBg indicated by M. The reason for the failure of the first UE to decode the downlink control channel # 1 allocated to the CBg is that the downlink control channel # 1 has not been transmitted from the base station and the downlink data channel # This is because some CBGs belonging to the group are prevailing.

FIG. 10 is a conceptual diagram showing a first embodiment of an HARQ response codebook in a communication system supporting CC, and FIG. 11 is a conceptual diagram showing a second embodiment of an HARQ response codebook in a communication system supporting CC.

Referring to FIG. 10 and FIG. 11, the number indicated in CBg may indicate the coding order of the HARQ response for the CBg. The BS may perform a decoding operation on the HARQ response based on the HARQ response codebook having the number of two cases according to whether the preemption indicator is received in the terminal. The base station can transmit a preemption indicator for each CC. Alternatively, the base station may transmit the preemption indicator via one CC. In this case, the base station can perform RRC setting for performing cross carrier scheduling for the UE. In this case, even if the CC in which the preemption indicator is received is different from the CC in which the downlink data channel is received, an HARQ response can be generated in consideration of the preemption indicator. That is, "Method 1", "Method 2", "Method 3", "Method 4", "Method 5" or "Method 6" can be applied.

When the UE fails to recognize CBg # 1 of CC # 2 and CBg # 0 of CC # 3 as M, it performs a decoding operation on CBg # 1 of CC # 2 and CBg # 0 of CC # Can be generated. The UE can assign an order to CBg according to a predefined HARQ response codebook and can code an HARQ response of CBg according to the given order. When the terminal does not recognize CBg # 1 of CC # 2 and CBg # 0 of CC # 3 as M, the coding order for the CBG HARQ response can be given as shown in FIG. At this time, the unrecognized CBg may not be included in the encoding order.

The base station can transmit a downlink assignment index (DAI) to the terminal. Alternatively, the BS may inform the UE of the size of the HARQ response codebook through an upper layer signaling procedure. Therefore, the UE can confirm the size of the HARQ response codebook by DAI or higher layer signaling procedure.

On the other hand, when CBg # 1 of CC # 2 and CBg # 0 of CC # 3 are recognized as M, the terminal does not perform decoding operation for CBg # 1 of CC # 2 and CBg # 0 of CC # And does not generate the HARQ response of CBg # 1 of CC # 2 and CBg # 0 of CC # 3. The UE may order the CBgs excluding the CBg # 1 of the CC # 2 and the CBg # 0 of the CC # 3 among all the CBgs and may code the HARQ response of the CBg according to the given order. In this case, the coding order for the HARQ response of CBg can be given as shown in FIG. Therefore, the HARQ response of CBg # 1 of CC # 2 and CBg # 0 of CC # 3 may not be transmitted on the uplink control channel, and the UE may encode HARQ responses of remaining CBg based on a predefined HARQ response codebook can do.

The UE can confirm the size of the HARQ response codebook by the DAI or higher layer signaling procedure. However, since the decryption operation is not performed on a specific CBg (i.e., CBg # 1 of CC # 2 and CBg # 0 of CC # 3), the UE does not perform the decoding operation on the basis of the size of the HARQ response codebook indicated by the DAI or higher layer signaling procedure The HARQ response can be encoded by applying a small size.

■ UCI transmission method

Next, a scenario in which an HARQ response or another downlink control channel is transmitted from the UE to the serving BS through the uplink control channel will be described.

The case where the uplink control channel includes four or more symbols is considered. For example, the uplink control channel may include 14 symbols corresponding to a maximum slot length. The time unit in which the UE performs the frequency hopping may vary according to the setting of the sub slot (or minislot). In a communication system supporting dynamic TDD, since the length of the slot is variable, the serving BS can inform the UE of the length of the UL control channel in advance. The length of the uplink control channel may be indicated by the downlink control information. For example, the downlink control information used for scheduling the downlink data channel may include the length information of the uplink control channel.

In another embodiment, when the serving base station transmits common control information including a slot format indicator on a physical downlink control channel (for example, a group-common downlink control channel) , The UE can determine the length of the uplink control channel based on the slot format indicator. The slot format indicator may indicate the configuration of the DL-UL symbol in the slot. The slot format indicator transmitted by the serving base station may indicate both the format of the current slot and the format of the future slot. For example, the serving base station may transmit common control information including k slot format indicators (e.g., SFI # 1, SFI # 2, ..., SFI #k) to the terminal for each slot. The k slot format indicators in the common control information may be concatenated.

The UE receiving the k slot format indicators can determine that the slot format indicator # 1 indicates the current format of the slot #n and the slot format indicator # 2 indicates the format of the slot # (n + 1) , And can determine that the slot format indicator #k indicates the format of the slot # (n + k). If the interval between the uplink control channels to which the HARQ response for the downlink data channel and the downlink data channel is transmitted is k, the UE generates uplink data based on the slot format indicator received through the downlink data channel set in the slot # It is possible to confirm the format of the slot # (n + k) in which the control channel is set. The slot format indicator may indicate the format of the slot in which the uplink data channel is set as well as the format of the slot in which the uplink control channel is set.

When a serving base station provides communication services to terminals having transmission times of different uplink control channels, a plurality of slot format indicators for the corresponding terminals may be transmitted through common control information. For example, if the first terminal receives the downlink data channel in slot #n and the transmission timing of the HARQ response of the first terminal is slot # (n + 3) ), It is necessary to know the length of the uplink interval. When the second terminal receives the downlink data channel in the slot #n and the transmission timing of the HARQ response of the second terminal is the slot # (n + 4), the second terminal transmits the downlink data channel in the slot # You should know the length of the interval.

The minimum time required to generate an HARQ response (e.g., UCI, uplink control information) at the terminal may be defined in the 3GPP TS. Alternatively, the serving BS can set a minimum time required for generating HARQ response (e.g., UCI, uplink control information) in the UE in consideration of the capability of the UE.

If the minimum time required to generate an HARQ response at the first terminal is a time corresponding to two slots, the terminal can not change the format of slot # (n + 3) (for example, slot # The length of the uplink interval in the uplink sector). In this case, the UE can generate an HARQ response in slots # (n + 1) and # (n + 2) and can transmit the generated HARQ response in the slot # (n + 3). If the minimum time required to generate the HARQ response at the second terminal is a time corresponding to one slot, the terminal can not change the format of the slot # (n + 4) in slot # (n + # < / RTI > (n + 4)). In this case, the UE can generate an HARQ response in slot # (n + 3) and can transmit the generated HARQ response in slot # (n + 4). The serving base station may transmit a slot format indicator of different slots in a broadcast manner at different time points in order to support uplink control information transmission operations of the first terminal and the second terminal. The above-described uplink control information transmission operation can be performed based on Figs. 12A and 12B below.

12A is a timing chart showing a first embodiment of a method of transmitting uplink control information, and FIG. 12B is a timing diagram showing a second embodiment of a method of transmitting uplink control information.

12A and 12B, the serving BS can transmit the downlink data channel and the preemption indicator to the terminal #i (i = 1, 2) in the slot #n. The terminal #i can receive the downlink data channel and the preemption indicator in the slot #n and can transmit the HARQ response for the downlink data channel in the slot # (n + k _i ). The minimum time required for the UE #i to generate an HARQ response (e.g., UCI, uplink control information) may be? _I. Here, the time unit of the Δ _i may be a slot, Δ _i can be zero or more slots. In this case, the terminal #i transmits a slot format indicator of the slot # (n + k _i ) in the slot # (n + k _i -Δ _i ) to the base station #i in order to transmit an HARQ response (for example, UCI, You should know. Therefore, the serving base station can transmit the slot format indicator for the terminal #i through the common control channel.

In Figure 12a, the serving base station is equal to "n + k _i -Δ _i" with the terminal and to check out any #i, slot # (n + k _i) all slot format indicator is applied to the slot # (n + k _{i - [} Delta] _i ). Since the serving base station knows the number of UEs operating in the RRC_connected state, the size of the common control channel (e.g., common control information) can be minimized by minimizing the number of slot format indicators. However, a receiving error of the common control channel may occur. To solve this problem, the serving base station can transmit the common control channel using a low coding rate. In addition, the serving base station may repeatedly transmit the slot format indicator at least twice. For example, in FIG. 12B, the serving base station may repeatedly transmit the slot format indicator three times. That is, slot format indicators for a plurality of specific slots can be transmitted through a downlink control channel, and a slot format indicator for one specific slot in the downlink control channel can be transmitted once. For example, the slot format indicator transmitted over the previous downlink control channel may be retransmitted on the current downlink control channel. In this case, the number of transmissions of the slot format indicator may be three as shown in FIG. 12B.

Meanwhile, the structure of the RE mapping of the UL control channel may be independent of the number of symbols occupied by the UL control channel. In the time domain, the coding operation can be performed based on different coding rates depending on the number of symbols occupied by the UL control channel. For example, a spreading code (e.g., orthogonal cover code (OCC)) may be defined for each symbol in the time domain. Therefore, a method of performing the encoding operation in the frequency domain may be preferable to the method of performing the encoding operation in the time domain. However, when the UE knows the length of the uplink control channel, it can perform not only the coding operation in the frequency domain but also the coding operation in the time domain. When information indicating that the frequency domain is dynamically changed is not received from the base station, the terminal can generate an uplink control channel by performing an encoding operation on the time-frequency domain set / indicated by the base station.

≪ RTI ID = 0.0 > Coverage  The transmission method of the uplink channel in case of being located at the boundary

The base station can inform the terminal (for example, the terminal located at the coverage boundary of the base station) of the number of repeated transmissions of the uplink control channel (e.g., PUCCH, UCI, HARQ response) through an upper layer signaling procedure, The UE can repeatedly transmit the uplink control channel. The iterative transmission of the uplink control channel may be set for the PUCCH format 1 / 1a / 1b used for transmission of the HARQ response in the primary cell of the UE. In addition, the base station transmits bundle transmission (e.g., transmission of different redundancy versions (RV) through TTI bundling) of an uplink data channel (for example, physical uplink shared channel (PUSCH) (E.g., a terminal located at the coverage boundary of the base station), and thus the terminal can perform bundling transmission for the uplink data channel.

When a terminal located at a coverage boundary of a base station requests downlink data transmission more than uplink data transmission, the base station can allocate the downlink data channel to the terminal more than the uplink data channel. In this case, since the base station can not transmit downlink data only through downlink adaptation, frequency resources for downlink data transmission can be additionally allocated through frequency aggregation. Also, the base station may allocate more time resources for downlink data transmission more frequently. Therefore, HARQ response for other downlink data may be generated before iterative transmission of the HARQ response for the downlink data is completed, as in the following embodiment.

13 is a timing diagram showing a first embodiment of HARQ response transmission in a communication system.

Referring to FIG. 13, the downlink data channel can be allocated by a dynamic or static scheduling procedure. The HARQ response for one downlink data channel can be transmitted through four uplink control channels. That is, the HARQ response can be repeatedly transmitted four times.

For example, the UE can receive the downlink data channel # 1 in the slot #n and the HARQ response # 1 (for example, the uplink control channel # 1) for the downlink data channel # # (n + 4) to # (n + 7). Also, the UE can receive the downlink data channel # 2 in the slot # (n + 2) and the HARQ response # 2 (for example, the uplink control channel # 2) for the downlink data channel # (N + 5) to # (n + 8). In this case, HARQ responses for different HARQ processes in slots # (n + 5) to # (n + 7) may be transmitted. Therefore, the number of HARQ responses transmitted through slot # (n + 4) or # (n + 8) may be different from the number of HARQ responses transmitted through slots # (n + have. When the uplink control channel is repeatedly transmitted, the HARQ response may be encoded based on various schemes in order to properly maintain the number of HARQ responses. For example, the HARQ response may be generated in TB units (or a small number of CBg units).

On the other hand, the position of the frequency resource in which the uplink control channel (for example, HARQ response) is repeatedly transmitted can be maintained to be the same. Alternatively, the uplink control channel may be repeatedly transmitted through different frequency resources. For example, the base station may be configured to transmit information (e. G., Reference signal) or information (e. (E.g., a subcarrier index, a PRB index) allocated for the uplink control channel through an uplink signaling procedure to a terminal estimated to be located at the coverage boundary of the base station, .

In an embodiment where the uplink control channel is transmitted on the same frequency resource, the base station may require a relatively large number of reference signals to estimate the uplink control channel of the terminal located at the coverage boundary of the base station. Accordingly, the UE can transmit the DM-RS using the same frequency resource in the coherence time, and the BS can correctly estimate the uplink control channel using the DM-RS received from the UE. In this case, demodulation / decoding error of the uplink control channel can be reduced.

When the uplink control channel is transmitted through different frequency resources, a gain due to frequency multiplexing can be obtained. In this case, the base station can obtain the uplink control channel relatively accurately from the terminal located at the coverage boundary of the base station. However, since the amount of uplink control information transmitted through the uplink control channel is large, an error may occur. To solve this problem, the base station can perform a soft combining operation on the uplink control information repeatedly received through the uplink control channel. The type and size of the uplink control information included in the uplink control channel may be always the same or different each time. However, since the base station knows the RE mapping information of the uplink control information in advance, soft combining By performing the operation, errors in demodulation / decoding can be reduced. For example, when the uplink control information includes an HARQ response, the UE can map the uplink control information to the RE using the HARQ response codebook defined in the 3GPP TS, The HARQ response can be confirmed by performing a soft combining operation on the control information.

The UE may perform an encoding operation according to the size of uplink control information (for example, HARQ response) transmitted on the uplink control channel. For example, the UE can perform a coding operation using spreading codes when the size of the uplink control information (e.g., HARQ response) is 1 bit or 2 bits. The UE can perform a coding operation using a linear block code (for example, Reed Muller code, Polar code) when the size of the uplink control information (e.g., HARQ response) is 3 bits or more.

When the uplink control channel is set to be repeatedly transmitted through the upper layer signaling procedure, the UE transmits an uplink control channel having different RVs (e.g., uplink channels having different RVs) with different RVs for each transmission opportunity of the uplink control channel Link control information). Different types of uplink control information may have different RVs. In addition, different coding rates may be applied to different types of UL control information having different RVs, and may be mapped to REs of an UL control channel. The base station may improve the reception quality by performing a soft combining operation on uplink control information having different RVs. The above-described method can be applied to a scenario in which the coding rate of the UL control channel remains the same. For example, in a frequency division duplex (FDD) or TDD-based communication system, since the length of an uplink interval occupied by an uplink control channel is the same, a UE can maintain the same coding rate by using the same time- have.

On the other hand, in the TDD-based communication system, since the length of the uplink interval is variable, the length of the uplink control channel transmitted by the UE may not be constant. In this case, the serving BS can inform the MS of the length of the uplink interval. For example, the BS may transmit resource allocation information of an uplink control channel (for example, uplink control channel) in which an HARQ response to a downlink data channel is transmitted through a downlink control channel on which resource allocation information of a downlink data channel is transmitted The length of the control channel, the start symbol position (e.g., start symbol index) of the uplink control channel, etc.). When the UE repeatedly transmits the uplink control channel n times in n slots, the resource allocation information of the uplink control channel may be different for each slot. In this case, the base station can transmit the resource allocation information of the n uplink control channels through the downlink control channel. Here, n may be an integer of 1 or more.

On the other hand, because of the existence of an uplink control channel (for example, an uplink control channel of a narrow interval, a short PUCCH) of another UE, the presence of a sounding reference signal (SRS) May be variable. Since all the symbols belonging to the UL slot can not be used for the uplink control channel of one UE, the base station can inform the UE of resource allocation information of the uplink control channel through the signaling procedure even in the TDD or FDD based communication system.

For example, the serving base station may transmit information (e.g., the number of symbols used by the uplink control channel) of the symbols (e.g., symbols per UL slot) used by the uplink control channel, End symbol index, etc.) to the terminal. The information of a symbol used by the uplink control channel is transmitted through a downlink control channel (for example, a downlink control channel through which resource allocation information of a downlink data channel corresponding to the uplink control channel is transmitted) Lt; / RTI >

In this case, the UE can confirm the information of the symbol used by the UL control channel. The UE can specify the time resource of the uplink control channel when it can know the start symbol index of the uplink control channel. The start symbol index of the uplink control channel may correspond to the slot format. The serving base station transmits a start symbol index (e.g., a slot format) of the uplink control channel to a downlink control channel (e.g., a downlink control channel in which resource allocation information of a downlink data channel corresponding to the uplink control channel is transmitted Channel) or higher layer signaling. Alternatively, the serving base station may transmit the start symbol index (e.g., slot format) of the uplink control channel through a separate downlink control channel in a broadcast manner. According to the above-described method, the UE can check the start symbol index of the UL control channel and the number of symbols used by the UL control channel in each UL slot.

However, the uplink control channel may not always be transmitted in consecutive UL slots. For example, in a TDD-based communication system, an uplink control channel may not be continuously transmitted by a DL slot. Alternatively, if the number of symbols included in the UL slot is small, the UL control channel may not be transmitted through the corresponding UL slot. That is, even when the maximum bandwidth (for example, the maximum number of PRBs) set by the serving BS is used for transmission of the UL control channel, the maximum coding rate (for example, the maximum coding rate allowed in 3GPP TS) When a high coding rate is required, the UL control channel may not be transmitted through the corresponding UL slot.

Meanwhile, the serving BS transmits a slot format indicator indicating an unknown resource (e.g., a slot including a tentative symbol or a tentative symbol) in a broadcast manner using a downlink control channel . The UE can receive the downlink data through the TBA and can transmit the HARQ response (e.g., uplink control information) for the downlink data. Also, the UE can transmit uplink data scheduled by the DL control channel through the TBS. The remaining UEs other than the UE may not transmit or receive a signal in a case where the TB resource and the resources for transmission and reception partially overlap (for example, a TB occurs in one or more symbols constituting a resource set as upper layer signaling in the base station) have. For example, a tentative resource can be used for transmission and reception of downlink and uplink data. Alternatively, undefined resources may be used for a variety of applications.

When a resource to be transmitted (hereinafter referred to as "UL allocated resource") does not overlap with a tentative resource on an uplink channel (e.g., an uplink data channel or an uplink control channel) An uplink channel can be transmitted. When the UL allocation resource is partially overlapped with the tentative resource, the terminal can regard the resource overlapped with the tentative resource as the UL allocation resource, and can transmit the UL channel through the considered UL allocation resource. Alternatively, the uplink channel may not be transmitted due to an undefined resource. In this case, the uplink channel that is not transmitted due to the undefined resource may not be counted as the number of repeated transmissions of the uplink channel. Alternatively, the uplink channel that can not be transmitted due to the undefined resource may be counted as the number of times of repeated transmission of the uplink channel.

FIG. 14A is a timing chart showing a first embodiment of a transmission method of an uplink channel in a communication system, and FIG. 14B is a timing diagram showing a second embodiment of a transmission method of an uplink channel in a communication system.

14A and 14B, a slot # (n + 2) may be a slot including a tentative symbol, and may be a slot including an uplink channel (for example, an uplink data channel, Link control channel) may not be transmitted. For example, if the tentative symbol overlaps with the uplink channel, the uplink channel may not be transmitted through the slot # (n + 2). The uplink channel may be repeatedly transmitted four times in the time domain and may be transmitted in a frequency hopping manner. In FIG. 14A, an uplink channel not transmitted by a slot including a tentative symbol can be counted as the number of times of repeated transmission of an uplink channel. In this case, the number of times the uplink channel is actually repeatedly transmitted (i.e., three times) may be smaller than the predetermined number of repeated transmission times (i.e., four times). In FIG. 14B, the uplink channel not transmitted by the slot including the undeclared symbol may not be counted as the number of times of repeated transmission of the uplink channel. In this case, the number of times the uplink channel is actually repeatedly transmitted (i.e., four times) may be the same as the predetermined number of repeated transmission times (i.e., four times). In the embodiment shown in FIG. 14A, the reception error rate of the uplink channel may be greater than the reception error rate of the uplink channel in the embodiment shown in FIG. 14B.

Meanwhile, at least one of the time resource, the frequency resource, and the sequence resource used by the UL control channel may be different for each slot. In this case, resource information of an uplink control channel of each slot can be transmitted through a downlink control channel used for transmission of resource allocation information of a downlink data channel. Therefore, the time-frequency resources for the uplink control channel can be set differently for each slot, and the uplink control channels of the plurality of UEs can be transmitted in a time division multiplexing (TDM) scheme in one slot. In a TDD or FDD-based communication system, when the length of the UL slot is variable, the UE transmits a different time-frequency resource in a plurality of UL slots in order to maintain the same coding rate of the UL control information in a plurality of UL slots To transmit the uplink control information. For example, when the uplink control information is repeatedly transmitted twice, the UE can transmit uplink control information through a resource composed of 2 symbols and 12 subcarriers in the first UL slot, Uplink control information can be transmitted through a resource composed of one symbol and 24 subcarriers in an UL slot. Therefore, the coding rate of the uplink control information in the first UL slot may be the same as the coding rate of the uplink control information in the second UL slot.

In this case, the resource information (e.g., resource index) of the uplink control channel signaled from the serving BS to the UE is allocated to a time resource occupied by the uplink control channel in each UL slot (E.g., the number of symbols used for the uplink control channel) and a frequency resource (e.g., the number of PRBs used for the uplink control channel). In this case, the base station transmits a slot type using a downlink control channel or a separate downlink control channel used for transmission of resource allocation information of a downlink data channel, so as to transmit the uplink control channel in the UL slot The first symbol to be used may be notified to the terminal.

According to the above-described methods, the time resource for the uplink control channel can be allocated differently in each of the slots, and the UE can repeatedly transmit the uplink control channel in the consecutive slots based on the resource allocation information . In this case, the delay time due to repeated transmission of the uplink control channel can be reduced. As another method for indicating the length of the uplink control channel, the base station transmits the uplink control channel length of the uplink control channel through a separate downlink control channel instead of the downlink control channel used for transmission of the resource allocation information of the downlink data channel. Can be transmitted in a broadcast manner.

In this case, the UE can check the length of the UL control channel in UL slots (e.g., UL-centric slots). Also, the UE can check the last symbol index of the uplink control channel through a separate signaling procedure, and derive the number of symbols used for the uplink control channel based on the last symbol index of the uplink control channel . However, when the uplink control channel is repeatedly transmitted and the length of the uplink control channel is different in each slot in which the uplink control channel is repeatedly transmitted, an uplink control channel (for example, uplink control channel Information) may vary. In this case, the base station may not perform the soft combining operation on the uplink control channel (e.g., uplink control information).

The UE can perform the coding operation on the uplink control information based on the minimum coding rate set by the upper layer signaling procedure of the serving base station or the minimum coding rate defined in the 3GPP TS. The ratio of the number (n) of modulated symbols to the maximum number of bits (k) of uplink control information transmitted on the uplink control channel may indicate the coding rate. The UE can generate a modulation symbol by performing a modulation operation on the coded bit, and can map the modulation symbol to m REs constituting the uplink control channel. The effective coding rate of the uplink control information may be a function of k, n and m, and the coding rate that remains constant for the soft combining operation in the decoding procedure may be a function of k and n. For example, for soft combining on the polar code, k and n may be set to a fixed ratio. Here, each of k, n and m may be an integer of 1 or more.

The size (m) of the uplink control channel can be calculated to obtain the coding rate (k, n). In the TDD-based communication system, since the uplink control channel occupies more than four symbols of time resources, the serving base station transmits the uplink signal through the uplink signaling procedure to obtain the desired coding rate (k, n, m) (I.e., the bandwidth occupied by the uplink control channel) of the control channel.

That is, the serving BS can allocate the minimum resource of the UL control channel to the UE. When the UE repeatedly transmits the uplink control channel more than k times, the resource size (m) used for repeated transmission of the uplink control channel may be different from each other. Here, k may be an integer of 2 or more, and may be "n < = m ". The UE may repeatedly map the modulation symbols to RE to maintain the coding rate (k, n). For example, the terminal may transmit n modulation symbols (e.g., modulation symbols # 1, 2, 3, ..., n) to m REs (e. G., RE # Mn "modulation symbols (e.g., RE # (n + 1), (n + (For example, modulation symbols # 1, 2, 3, ..., mn) can be repeatedly mapped. In addition, when uplink control information having different RVs is repeatedly transmitted, the UE uses modulation symbols of uplink control information having different RVs based on the scheme described above to maintain the coding rate (k, n) And can be repeatedly mapped to a different number of REs.

Meanwhile, the location of the frequency resource used for transmission of the uplink control channel may be determined based on the following embodiments.

15A is a timing chart showing a third embodiment of a transmission method of an uplink channel in a communication system.

Referring to FIG. 15A, when the UE repeatedly transmits the uplink control channel more than k times, the number of frequency bands used for transmission of the uplink control channel may be two or more. Here, k may be an integer of 2 or more. The uplink control channel may be transmitted in the frequency hopping manner within the same UL slot and the same frequency hopping pattern may be used in the UL slots in which the uplink control channel is repeatedly transmitted. In a dynamic or static TDD based communication system, the uplink control channel may be transmitted using some symbols in the slot.

15B is a timing diagram showing a fourth embodiment of a transmission method of an uplink channel in a communication system.

Referring to FIG. 15B, the UE can repeatedly transmit the uplink control channel two or more times. The uplink control channel can be transmitted in a frequency hopping scheme in UL slot unit. In this case, the base station can set up in the UE through an upper layer signaling procedure so as not to perform frequency hopping for the uplink control channel within the same UL slot. The uplink control channel is transmitted through two frequency bands, so that a frequency multiplexing gain can be obtained. In a dynamic or static TDD based communication system, the uplink control channel may be transmitted using some symbols in the slot.

15C is a timing chart showing a fifth embodiment of a transmission method of an uplink channel in a communication system.

Referring to FIG. 15C, the UE can repeatedly transmit an uplink control channel at least twice, and the uplink control channel can be transmitted through at least three frequency bands. That is, the base station can set up the uplink control channel through an upper layer signaling procedure so that the terminal transmits uplink control channels using three or more frequency bands. The uplink control channel may be transmitted in the frequency hopping scheme within the same UL slot and the frequency hopping pattern of the uplink control channel may be different in each of the UL slots. The uplink control channel may be transmitted through two frequency bands in each of the UL slots, and the center frequencies applied in the hopping of the uplink control channel in neighboring UL slots may be different from each other.

The base station can inform the terminal of the frequency hopping pattern of each UL slot through an upper layer signaling procedure. For example, the frequency hopping pattern may be indicated by a function for the UL slot index over which the UL control channel is transmitted. In order to maximize the frequency multiplexing gain, the uplink control channel may be transmitted through the center band as well as the edge band in the frequency domain.

In a first embodiment of a method for informing a UE of three frequency bands in which an uplink control channel is transmitted, a base station transmits a frequency-hopping (UL) control signal to the UE through an upper layer signaling procedure, The center frequency positions f ₁ , f ₂ , ..., f _k of the uplink control channel in the UL slots and the bandwidth ΔF. When the uplink bandwidth preset by the base station is used as the frequency hopping bandwidth? F of the uplink control channel, the base station transmits the center frequency positions f ₁ , f ₂ , ..., f _k ) to the terminal. MS may transmit an uplink control channel by using a k slot in the second UL frequency resource "f _k -ΔF / 2" and _{"f k + ΔF / 2"} . Alternatively, the terminal may determine the location of the frequency band by transmitting the uplink control channel based on a center frequency position _{(f 1, f 2, ...} , f k) and the UL slot index of the uplink control channel in the UL slot .

In a second embodiment of a method for informing a terminal of three frequency bands in which an uplink control channel is transmitted, a base station transmits a location of a resource used for transmission of an uplink control channel in UL slots through an upper layer signaling procedure For example, the location of the frequency resource). The UE can calculate the position of the frequency resource actually used for transmission of the UL control channel based on the information obtained through the upper layer signaling procedure. For example, the base station can inform the terminal of a frequency resource used for transmission of an uplink control channel through a combination of an upper layer signaling procedure and a downlink control information transmission procedure. In this case, the UE can calculate the position of the frequency resource used for transmission of the UL control channel using the value set by the UL signaling procedure and the value indicated by the DL control information. If the value set by the upper layer signaling procedure differs from UL slot to UL slot and the value indicated by the downlink control information is the same in UL slots, the UE can compute positions of different frequency resources in UL slots.

When the uplink control channel is transmitted through three or more frequency bands, the base station can receive the uplink control channel in the middle band as well as the edge band in the frequency domain. In this case, the uplink control channel of the first terminal can coexist with the uplink data channel of the second terminal. The BS may adjust the frequency hopping boundary of the uplink control / data channel and the DM-RS position so as to facilitate coexistence in scheduling the UEs. The UEs can multiplex the DM-RS of the uplink channel according to the CDMA scheme, and the BS can distinguish the DM-RSs of the UEs based on the CDMA scheme. Here, the DM-RS may be generated based on the same sequence (for example, a Zadoff-Chu sequence, a CAZAC (Constant Amplitude Zero AutoCorrelation) sequence).

■ Simultaneous support of PUSCH bundling transmission and PUCCH repeat transmission

In order to improve the transmission range of the uplink data channel, the serving base station can inform the terminal of the number of times of repeated transmission of the uplink data channel through the uplink signaling procedure. In addition, in order to improve the transmission range of the uplink control channel, the serving base station can inform the terminal of the number of repeated transmission of the uplink control channel through the uplink signaling procedure.

When uplink data is generated, the UE can make a scheduling request for uplink data transmission to the serving base station. In response to the scheduling request from the serving base station, downlink control information including uplink data channel resource allocation information (E. G., A downlink control channel). In addition, when downlink data is generated, the serving base station may transmit downlink control information (e.g., a downlink control channel) including resource allocation information of a downlink data channel to the mobile station, And transmit the downlink data to the terminal through the downlink data channel. The UE can receive the downlink data and generate the HARQ response to the downlink data.

In this case, if the UL slot to which the HARQ response to the downlink data is to be transmitted is the same as the UL slot to which the uplink data is to be transmitted, the UE transmits the HARQ response and the uplink data to the serving base station using the uplink data channel Lt; / RTI > Herein, the MS may map an HARQ response to an area of an uplink data channel. Also, when the uplink control channel and the uplink data channel are repeatedly transmitted, the UL slots through which the uplink control channel is transmitted may be overlapped with the UL slots through which the uplink data channel is transmitted.

16A is a timing chart showing a first embodiment of a transmission scheme of an uplink control / data channel in a communication system, and FIG. 16B is a timing diagram showing a second embodiment of a transmission scheme of an uplink control / 16C is a timing chart showing a third embodiment of a transmission scheme of the uplink control / data channel in the communication system, and Fig. 16D is a timing chart of the fourth embodiment of the transmission scheme of the uplink control / data channel in the communication system. Is a timing chart showing an example.

16A to 16D, the serving BS can allocate the uplink data channel first, and then allocate the uplink control channel. The uplink data channel may be repeatedly transmitted four times, and the uplink control channel (e.g., uplink control information) may be repeatedly transmitted four times. In this case, one or more slots among the slots through which the uplink data channel is to be transmitted may overlap the slots through which the uplink control channel is to be transmitted. Each of the uplink data channel and the uplink control channel can be transmitted based on a frequency hopping scheme.

16A, the UE can transmit the uplink data channel through the slot # 0-1 (for example, the UL slot or the UL-centric slot), the uplink data channel and the uplink control channel through the slot # 2- 3 (e.g., UL slot or UL-centric slot), and may transmit the UL control channel through slot # 4-5 (e.g., UL slot or UL-centric slot) . That is, in the slot # 2-3, the uplink data channel and the uplink control channel can be simultaneously transmitted.

16B, the UE can transmit the uplink data channel through the slot # 0-1 (for example, UL slot or UL-centric slot), and transmits uplink data including uplink data and uplink control information (E.g., an UL slot or an UL-centric slot), and transmits an uplink control channel to a slot # 4-5 (e.g., an UL slot or a UL- ). ≪ / RTI > That is, in the slot # 2-3, the uplink data channel and the uplink control channel may not be simultaneously transmitted, and the uplink data channel including the uplink data and the uplink control information may be transmitted.

16C, the terminal may transmit the uplink data channel through slot # 0-1 (for example, UL slot or UL-centric slot), and when slot # 2 is a slot including a tentative symbol, # 2. ≪ / RTI > For example, if a resource used for transmission of the uplink data channel or the uplink control information overlaps with the undecided symbol, no signal may be transmitted through the slot # 2. The uplink channel not transmitted by the slot including the undefined symbol may not be counted as the number of times of repeated transmission of the uplink channel. The UE can transmit the uplink data channel including the uplink data and the uplink control information through the slot # 3-4 (for example, UL slot or UL-centric slot) and transmit the uplink control channel to the slot # 5-6 (e.g., UL slot or UL-centric slot). That is, in the slot # 3-4, the uplink data channel and the uplink control channel may not be simultaneously transmitted, and the uplink data channel including the uplink data and the uplink control information may be transmitted.

16D, the terminal may transmit the uplink data channel through slot # 0-1 (e.g., UL slot or UL-centric slot), and when slot # 2 is a slot including a tentative symbol, # 2. ≪ / RTI > For example, if a resource used for transmission of the uplink data channel or the uplink control information overlaps with the undecided symbol, no signal may be transmitted through the slot # 2. An uplink channel not transmitted by a slot including a tentative symbol may be counted as the number of times of repeated transmission of the uplink channel. The UE may transmit an uplink data channel including uplink data and uplink control information through slot # 3 (e.g., UL slot or UL-centric slot). In this case, the uplink data channel can be transmitted in the first slot (i.e., slot # 3) in which it is determined that transmission of the uplink data channel is possible after the slot including the tentative symbol. In addition, the UE may transmit the uplink control channel through a slot # 4-5 (e.g., UL slot or UL-centric slot). That is, in the slot # 3, the uplink data channel and the uplink control channel may not be simultaneously transmitted, and the uplink data channel including the uplink data and the uplink control information may be transmitted.

16A to 16D, when the serving base station calculates the number of PRBs for the uplink data channel, the uplink data is punctured by the uplink control information bits or the rate matching (rate matching may not be expected to be performed. Therefore, it may be preferable that the serving BS allocates a slot for the uplink control channel to the UE after the iterative transmission of the uplink data channel is completed. Alternatively, the size of the uplink control information transmitted together with the uplink data may be adjusted through the uplink data channel, so that the above-mentioned problems can be solved.

In the embodiments shown in FIGS. 17A to 17D, unlike the embodiments shown in FIGS. 16A to 16D, the serving BS can allocate the uplink control channel first and then allocate the uplink data channel .

17A is a timing diagram showing a fifth embodiment of a transmission scheme of an uplink control / data channel in a communication system, and FIG. 17B is a timing diagram illustrating a sixth embodiment of a transmission scheme of an uplink control / 17C is a timing chart showing a seventh embodiment of the transmission scheme of the uplink control / data channel in the communication system, FIG. 17D is a timing chart of the eighth implementation of the transmission scheme of the uplink control / data channel in the communication system Is a timing chart showing an example.

17A to 17D, the uplink control channel (for example, uplink control information) can be repeatedly transmitted four times, and the uplink data channel can be repeatedly transmitted four times. In this case, one or more slots among the slots through which the uplink control channel is to be transmitted may be overlapped with slots to which the uplink data channel is to be transmitted. Each of the uplink control channel and the uplink data channel may be transmitted based on a frequency hopping scheme.

17A, the UE can transmit the uplink control channel and the uplink data channel through the slot # 0-1 (for example, the UL slot or the UL-centric slot) 3 (e.g., UL slot or UL-centric slot), and may transmit the uplink data channel through slot # 4-5 (e.g., UL slot or UL-centric slot) . That is, in the slot # 2-3, the uplink control channel and the uplink data channel can be simultaneously transmitted.

17B, the UE can transmit the uplink control channel through the slot # 0-1 (for example, UL slot or UL-centric slot), and transmits uplink data including uplink data and uplink control information Channel through slot # 2-3 (e.g., UL slot or UL-centric slot), and transmit the uplink data channel to slot # 4-5 (e.g., UL slot or UL- ). ≪ / RTI > That is, in the slot # 2-3, the uplink control channel and the uplink data channel may not be simultaneously transmitted, and the uplink data channel including the uplink data and the uplink control information may be transmitted.

In FIG. 17C, the UE can transmit the uplink control channel through a slot # 0-1 (for example, an UL slot or a UL-centric slot), and when the slot # 2 is a slot including a tentative symbol, # 2. ≪ / RTI > For example, if a resource used for transmission of the uplink data channel or the uplink control information overlaps with the undecided symbol, no signal may be transmitted through the slot # 2. The uplink channel not transmitted by the slot including the undefined symbol may not be counted as the number of times of repeated transmission of the uplink channel. The UE can transmit the uplink data channel including the uplink data and the uplink control information through the slot # 3-4 (for example, the UL slot or the UL-centric slot) 5-6 (e.g., UL slot or UL-centric slot). That is, in the slot # 3-4, the uplink control channel and the uplink data channel may not be simultaneously transmitted, and the uplink data channel including the uplink data and the uplink control information may be transmitted.

17D, the UE can transmit the uplink control channel through slot # 0-1 (for example, UL slot or UL-centric slot), and when slot # 2 is a slot including a tentative symbol, # 2. ≪ / RTI > For example, if a resource used for transmission of the uplink data channel or the uplink control information overlaps with the undecided symbol, no signal may be transmitted through the slot # 2. An uplink channel not transmitted by a slot including a tentative symbol may be counted as the number of times of repeated transmission of the uplink channel. The UE may transmit an uplink data channel including uplink data and uplink control information through slot # 3 (e.g., UL slot or UL-centric slot). In this case, the uplink data channel can be transmitted in the first slot (i.e., slot # 3) in which it is determined that transmission of the uplink data channel is possible after the slot including the tentative symbol. In addition, the terminal may transmit the uplink data channel through slot # 4-5 (e.g., UL slot or UL-centric slot). That is, in the slot # 3, the uplink control channel and the uplink data channel may not be simultaneously transmitted, and the uplink data channel including the uplink data and the uplink control information may be transmitted.

17A to 17D, when the serving base station calculates the number of PRBs for the uplink data channel, the uplink data is punctured by the uplink control information bits or the rate matching is performed for the uplink data Can be expected. In this case, the serving base station may transmit the resource allocation information of the uplink data channel considering the puncturing or rate matching of the uplink data to the terminal. Therefore, when the uplink data channel is decoded, the base station can minimize the influence of the uplink control information bits.

Meanwhile, when the uplink control information includes the HARQ response and the CSI (e.g., periodic CSI, semi-persistent CSI), the serving BS determines the uplink data channel considering the uplink control information You can allocate resources for. When the uplink control information includes the HARQ response and the non-periodic CSI, the serving BS can request the UE to transmit the aperiodic CSI on the downlink control channel. Therefore, the serving BS considers the uplink control information And allocate resources for the uplink data channel. When the uplink control information includes an HARQ response of 3 bits or more and the uplink control information is transmitted on the uplink data channel together with the uplink data, the UE can perform rate matching on the uplink data channel . When the uplink control information includes a 1-bit or 2-bit HARQ response and the corresponding uplink control information is transmitted on the uplink data channel together with the uplink data, the UE performs puncturing on the uplink data channel can do. Also, when the uplink control information is transmitted through the uplink data channel, the UE can compress the HARQ response bits included in the uplink control information.

For example, if a plurality of downlink data channels are received, the terminal performs a logical AND operation on the HARQ responses for the received plurality of downlink data channels to generate a 1-bit or 2-bit HARQ response 1 bit or 2 bits of HARQ response for each space). In this case, puncturing on the uplink data channel may be performed to transmit a 1-bit or 2-bit HARQ response on the uplink data channel.

Alternatively, when a downlink data channel composed of a plurality of CBgs is received, the UE performs a logical AND operation on HARQ responses for the received plurality of CBgs (e.g., a plurality of CBgs belonging to the same TB) To generate a 1-bit or 2-bit HARQ response. When a 2-bit HARQ response is generated, the UE can generate a 1-bit HARQ response by performing a logical AND operation on a 2-bit HARQ response. In this case, puncturing on the uplink data channel may be performed to transmit a 1-bit or 2-bit HARQ response on the uplink data channel.

Therefore, when the puncturing for the uplink data channel is performed to transmit the HARQ response through the uplink data channel, the amount of HARQ response is limited to 1 bit or 2 bits, so that the reception error is minimized in the decoding process of the uplink data .

The embodiment described above may be the same as the embodiment shown in Fig.

18 is a timing chart showing a ninth embodiment of a transmission scheme of an uplink control / data channel in a communication system.

Referring to FIG. 18, a serving BS may transmit a downlink control channel set # 1 including a plurality of downlink control channels including resource allocation information of a downlink data channel, It is possible to transmit the downlink control channel set # 2 including the resource allocation information and the downlink control channel set # 2 including the plurality of downlink control channels including the resource allocation information of the downlink data channel . The downlink control channel set # 1 may be transmitted before the downlink control channel 1800, and the downlink control channel set # 2 may be transmitted after the downlink control channel 1800. The uplink control channel is repeatedly transmitted four times, and the uplink data channel is repeatedly transmitted four times. In FIG. 18, the downlink control channel set # 1 and the downlink control channel set # 2 are both allocated to the downlink control channel set # 1 and the downlink control channel set # 2 to transmit the uplink control channel in the slot # It is assumed that the downlink control channel instructs the UE. In this case, in the slots # 1 to # 4, the uplink control channel may be repeatedly transmitted four times. On the other hand, the downlink control channel 1800 instructs the UE to transmit the uplink data channel in the slot # 3. In this case, if the transmission is repeated four times, the uplink data channel can be repeatedly transmitted four times in the slots # 3 to # 6.

The serving BS can know the size of the HARQ response (hereinafter referred to as "HARQ response # 1") for the downlink data channels scheduled by the downlink control channel set # 1.

1 through the uplink data channel 1810 scheduled by the downlink control channel 1800 because the serving base station already knows the amount of the HARQ response # 1, May allocate resources of the uplink data channel 1810 considering puncturing or rate matching of the uplink data channel 1810. [

The UE can receive downlink data channels from the resources indicated by the downlink control channel set # 2 and transmit a HARQ response (hereinafter referred to as "HARQ response # 2") for the received downlink data channels And can perform an encoding operation on the generated HARQ response # 2. In this case, when there is an HARQ response # 1, since the slots for transmitting the uplink control channel overlap in the same manner, the coding operation can be performed including both the HARQ response # 1 and the HARQ response # 2. Since the downlink control channel set # 2 is transmitted after the downlink control channel 1800, at the transmission time point of the downlink control channel 1800 allocating the resources of the uplink data channel 1810, The amount is unknown. On the other hand, as described above, if there is an HARQ response # 1, the base station can allocate resources of the uplink data channel considering the amount of HARQ response # 1 to the UE.

The UE transmits a HARQ response # 1 and an HARQ response # 2 in the same slot # 1 on the uplink control channel according to an instruction from the base station. The serving BS must perform resource allocation in which the uplink data channel 1810 considers the HARQ response # 1 in the slot # 3 and the slot # 4 but can not consider the HARQ response # 2. In this case, an operation of decreasing the amount of HARQ response # 2 may be defined in order to minimize performance deterioration of the uplink data channel 1810 due to HARQ response # 2. The terminal can perform compression for HARQ response # 2. For example, the UE can generate a 1-bit or 2-bit HARQ response by performing a logical AND operation on HARQ response # 2. This can be applied to both cases of generating HARQ for each TB in the downlink control channel set # 2 and generating HARQ for each CBg.

If the HARQ response # 1 is transmitted through the uplink data channel 1810 indicated by the downlink control channel 1800 (i.e., the HRAQ response # 2 is not transmitted), the UE considers HARQ response # 1 To perform rate matching on the uplink data channel 1810. Alternatively, when an HARQ response # 1 and an HARQ response # 2 are transmitted through an uplink data channel 1810 indicated by the downlink control channel 1800, the UE transmits an uplink data channel 1810, and perform puncturing on the uplink data channel 1810 for transmission of HARQ response # 2.

■ How to configure various payloads

In the following embodiment, repeated transmission of HARQ response # 2 to downlink data channel # 2 is performed before iterative transmission of HARQ response # 1 to downlink data channel # 1 is completed, and HARQ response # 1 and HARQ response # # 2 The method of configuring the uplink channel (for example, the uplink payload) will be described when the slots in which the repeated transmission starts are different from each other. Here, the amount of resources of the uplink channel can be variably set for each slot.

Referring back to FIG. 13, the base station can transmit downlink data channel # 1 in slot #n and downlink data channel # 2 in slot # (n + 2). The UE can receive the downlink data channel # 1 in the slot #n and the HARQ response # 1 (i.e., the uplink control channel # 1) for the downlink data channel # 1 to the slots # (n + 4) (n + 7) times. The UE can receive the downlink data channel # 2 in the slot # (n + 2) and the HARQ response # 2 (i.e., the uplink control channel # 2) for the downlink data channel # 5) to # (n + 8).

Here, the UE can generate an m-bit HARQ response # 1 and an m'-bit HARQ response # 2. The UE determines m and m 'based on the function of the number of CBg and the number of DL CCs acquired through the "uplink signaling procedure" or "combination of uplink signaling procedure and downlink control channel transmission procedure & . The UE can determine the size of the HARQ response codebook for slot # (n + 4) as m bits and the size of the HARQ response codebook for slots # (n + 5) to # (n + 7) as m + m ' , And determine the size of the HARQ response codebook for slot # (n + 8) as m 'bits.

The UE may perform coding for the HARQ response codebook using formats of a single uplink control channel (for example, NR PUCCH format 3) or formats of a plurality of uplink control channels according to the setting of the base station. When a single format is used, each of the m bits, m + m 'bits and m' bits may have a size (e.g., a sufficient number of symbols or a sufficient amount of resource blocks) supported by a single format. When a plurality of formats are used, the terminal can select an appropriate format according to the size of the HARQ response codebook. For example, the UE can use format A (e.g., NR PUCCH format 0) if the size of the HARQ response codebook is 1 bit, format B (e.g., For example, NR PUCCH format 1) may be used, and format C (e.g. NR PUCCH format 2 or format 3 or format 4) may be used when the size of the HARQ response codebook is 3 bits or more. As another example, a format D (e.g., LTE PUCCH format 1 or format 1a or format 1b) can be used when the size of the HARQ response codebook is 1 to 2 bits, and the size of the HARQ response codebook is 3 to 4 bits (E. G., LTE PUCCH format 1b with channel selection) with channel selection, and if the size of the HARQ response codebook is 3 to 21 bits, then format F (e. G., LTE PUCCH format 3), and may use format G (e.g., LTE PUCCH format 4 or format 5) if the size of the HARQ response codebook is 22 bits or more.

■ How to configure a fixed payload

In the following embodiment, when iterative transmission of the HARQ response # 2 to the downlink data channel # 2 is performed before the repeated transmission of the HARQ response # 1 to the downlink data channel # 1 is completed, For example, an uplink payload) will be described. Here, the size of the HARQ response codebook transmitted through the uplink channel may not be changed.

The base station can inform the UE of the transmission timing of the HARQ response for the downlink data channel together with the resource allocation information of the downlink data channel. For example, the base station may inform a terminal of a transmission timing set of an HARQ response through an upper layer signaling procedure, and may select a transmission timing set of a HARQ response through a downlink data channel used for scheduling a downlink data channel And inform the UE of the transmission timing of one HARQ response. The signaling method of the transmission timing of the HARQ response can be applied to both slot-based scheduling and subslot-based scheduling in which the downlink data channel interval is different.

Therefore, the BS can adjust the transmission timing of the HARQ response for the downlink data channel in order to keep the size of the HARQ response codebook the same as in the embodiment shown in FIG. 19 below.

19 is a timing chart showing a sixth embodiment of a transmission method of an uplink channel in a communication system.

In FIG. 19, a DL slot means a slot through which a downlink data channel can be transmitted, and may not necessarily mean a downlink slot or a downlink-centric slot. In FIG. 19, UL slot refers to a slot through which an uplink control channel can be transmitted, and may not necessarily mean an uplink slot or an uplink-centric slot.

Referring to FIG. 19, a BS may transmit a downlink data channel to a UE, and a UE receiving a downlink data channel may repeat an HARQ response (for example, an uplink control channel) for a downlink data channel four times Lt; / RTI > The transmission timing of the HARQ response (i.e., the first position of the UL slot in which the HARQ response is transmitted) may be indicated by a downlink control channel used for scheduling the corresponding downlink data channel.

For example, the base station transmits resource allocation information (e.g., DL slot #n) of downlink data channel # 1 and transmission timing of HARQ response # 1 (e.g., UL slot # (n + 1)) of the downlink data channel # 2 and a downlink control channel including the downlink data channel # 2 (n + 1) (E.g., UL slot # (n + 8)) of the HARQ response # 2 for the downlink control channel. The UE receiving the DL control channel can confirm the resource allocation information of the DL data channel and the transmission timing of the HARQ response to the DL data channel.

In this case, the base station can transmit the downlink data channel # 1 in the DL slot #n and the terminal receiving the downlink data channel # 1 can transmit the HARQ response in the UL slots # (n + 4) to # (n + # 1 can be repeated four times. The base station can transmit the downlink data channel # 2 in the DL slot # (n + 1), and the terminal receiving the downlink data channel # 2 can transmit UL slots # (n + 8) to # It is possible to repeatedly transmit HARQ response # 2 4 times. Therefore, the size of the HARQ response codebook can be kept the same in UL slots # (n + 4) to # (n + 11).

The embodiments described above can be applied to communication systems that support a plurality of numerologies (e.g., when the NM of a DL slot is different from that of a UL slot), a communication system supporting TDD, and the like have. The base station informs the UE of the transmission timing of an appropriate HARQ response so that the downlink data channel can be scheduled even if the repeated transmission of the HARQ response is not completed.

Alternatively, the base station may not notify the terminal of the transmission timing of the HARQ response using a separate downlink control channel. In this case, the UE knows the UL slot (or UL-centric slot) of the UL slot (or UL-centric slot) usable because it already knows the number of repetitive transmissions k of the UL control channel To transmit the HARQ response.

The minimum processing time of the downlink data channel (e.g., the minimum processing time required for generation / transmission of the HARQ response to the downlink data channel) can be set by an upper layer signaling procedure. Alternatively, the minimum processing time of the downlink data channel may be predefined in the 3GPP TS. In this case, there may be k DL slots (or DL-centric slots) corresponding to k UL slots (or UL-centric slots) used for repeated transmission of the HARQ response.

■ Soft Combining Operation

The UE can transmit uplink control information (UCI) having different redundancy versions (RV). Here, the uplink control information may be an HARQ response codebook to which a polar code is applied. When the new HARQ response bit is coded, the UE can newly derive the RV of the uplink control information including the coded HARQ response bit.

Referring to FIG. 13 again, if the UE does not have a new HARQ response bit, it can transmit uplink control information in the order of "RVa → RVb → RVc → RVd". In slot # (n + 4), the UE may perform an encoding operation for m-bit HARQ response # 1 and may transmit RV a of uplink control information including encoded m bits. In the slot # (n + 5), the UE can perform the encoding operation for the HARQ response # 2 of the m-bit HARQ response # 1 + m 'bits and can perform the uplink operation including the encoded m + m' RV a of the link control information. In the slot # (n + 6), the UE can transmit the RV b of the uplink control information including the encoded m + m 'bits, and the UE can transmit the encoded m + m' RV c of the uplink control information including the uplink control information. In slot # (n + 8), the UE can perform an encoding operation for m 'bits of HARQ response # 2 and can transmit RV a of uplink control information including encoded m' bits.

The methods according to the present invention can 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 those specially designed and constructed for the present invention or may be available to those skilled in the computer software.

Examples of computer readable media include hardware devices that are specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (20)

A method of operating a terminal in a communication system,
Receiving a downlink data channel from a base station in slot #n or slot # nl;
Receiving a slot format indicator indicating a format of a slot # (n + k) from which the uplink control information is transmitted, from the base station in the slot #n; And
And transmitting the uplink control information including a hybrid automatic repeat request (HARQ) response for the downlink data channel to the base station in the slot # (n + k), wherein each of n and k is 0 or more And l is an integer of 1 or more. The method according to claim 1,
Wherein the slot format indicator indicates a format of slots # (n + k) to # (n + k + j), and j is an integer equal to or greater than one. The method according to claim 1,
Format indicators for two or more different slots are transmitted in the slot #n, and one slot format indicator among the two or more different slot format indicators indicates a format of the slot # (n + k) And the remaining slot format indicator indicates a format of a slot contiguous with the slot # (n + k). The method according to claim 1,
Two or more different slot format indicators are transmitted in the slot #n, and one slot format indicator among the two or more different slot format indicators indicates a format of the slot # (n + k) The format indicator is a slot format indicator transmitted through a slot prior to the slot #n, and the remaining slot format indicator indicates a format of a slot other than the slot # (n + k). The method according to claim 1,
Wherein the slot format indicator indicates the number of one or more symbols used for transmission of at least the uplink control information in the slot # (n + k). The method according to claim 1,
Wherein the slot format indicator is received on a common control channel of the slot #n. The method according to claim 1,
Wherein a time interval between the slot #n and the slot # (n + k) is a minimum time required to generate the HARQ response for the downlink data channel. A method of operating a terminal in a communication system,
Receiving a downlink data channel from a base station in slot #n;
Repeatedly transmitting an uplink data channel to the base station in slot # (n + 1) through slot # (n + l + k) k times; And
The step of repeatedly transmitting uplink control information including a hybrid automatic repeat request (HARQ) response for the downlink data channel in slot # (n + m) to slot # (n + m + k '≪ / RTI &
wherein each of n, l, and m is an integer equal to or greater than 0, and k and k 'are integers equal to or greater than 1, and the uplink data channel and the uplink control information are simultaneously transmitted in at least one slot. The method of claim 8,
Wherein when the uplink data channel and the uplink control information are simultaneously transmitted in the at least one slot, the uplink control information is transmitted through the uplink data channel instead of the uplink control channel. The method of claim 9,
Wherein the uplink control information is transmitted through a punctured RE among resource elements (REs) set for the uplink data channel. The method of claim 9,
When the uplink control information is mapped to one or more REs set for the uplink data channel, the uplink data includes at least one RE among the REs set for the uplink data channel excluding the one or more REs to which the uplink control information is mapped Mapping the remaining REs and performing a rate matching operation on the uplink data when an RE mapping operation is performed. The method of claim 8,
There are p slots including an unknown symbol among the slots # n + 1 to n + m + k ', and the pseudo symbol is transmitted to the uplink data channel or the uplink control information , The uplink data channel and the uplink control information are not transmitted through the p slots and the uplink data channel is allocated to the slots # (n + m + k + p), and the uplink control information is transmitted k times repeatedly in the slot # (n + m) And p is an integer of 1 or more. The method of claim 8,
There are p slots in the slot # (n + l) to the slot # (n + m + k ') including the delta symbol and the delta symbol transmits the uplink data channel or the uplink control information , The uplink data channel and the uplink control information are not transmitted through the p slots and the uplink data channel is allocated to the slot # (n + 1) to the slot # (n + m + k + 1) times in the slot # (n + m + k) And p is an integer of 1 or more. The method of claim 8,
Wherein the number k of repeated transmissions of the uplink data channel and the number k 'of repeated transmissions of the uplink control information are set through at least one of an upper layer signaling procedure and a DCI (downlink control information) How it works. A method of operating a terminal in a communication system,
Receiving a downlink data channel from a base station in slot #n;
And repeatedly transmitting uplink control information including a hybrid automatic repeat request (HARQ) response for the downlink data channel in the slots # (n + 1) to # (n + l + k) ; And
And repeatedly transmitting the uplink data channel k 'times in slot # (n + m) through slot # (n + m + k'),
where n is an integer equal to or greater than 0, 1 and m are each an integer equal to or greater than 1, k and k 'are integers equal to or greater than 2, and the uplink control information and the uplink data channel are simultaneously transmitted Lt; / RTI > 16. The method of claim 15,
Wherein if the uplink control information and the uplink data channel are simultaneously transmitted in the at least one slot, the uplink control information is transmitted through the uplink data channel instead of the uplink control channel. 18. The method of claim 16,
Wherein the uplink control information is transmitted through a punctured RE among resource elements (REs) set for the uplink data channel. 18. The method of claim 16,
When the uplink control information is mapped to one or more REs set for the uplink data channel, the uplink data includes at least one RE among the REs set for the uplink data channel excluding the one or more REs to which the uplink control information is mapped Mapping the remaining REs and performing a rate matching operation on the uplink data when an RE mapping operation is performed. 16. The method of claim 15,
There are p slots including an unknown symbol among the slots # n + 1 to n + m + k ', and the pseudo symbol is transmitted to the uplink data channel or the uplink control information The uplink control information and the uplink data channel are not transmitted through the p slots, and the uplink control information is transmitted to the slot # (n + 1) through the slot # (n + m + k + p), and the uplink data channel is repeatedly transmitted k times in the slot # (n + m) And p is an integer of 1 or more. 16. The method of claim 15,
There are p slots in the slot # (n + l) to the slot # (n + m + k ') including the delta symbol and the delta symbol transmits the uplink data channel or the uplink control information The uplink control information and the uplink data channel are not transmitted through the p slots, and the uplink control information is transmitted to the slots # (n + 1) to # (n + m + k + 1) times in the slot # (n + m + k + And p is an integer of 1 or more.

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