KR20210040762A - Method and apparatus for transmitting and receiving data in a wireless communication - Google Patents

Abstract

The present invention provides a terminal communication method, which includes the steps of: receiving an upper layer signal including setting information related to repeated transmission; receiving at least one downlink control information of a first TRP (Transmission and Reception Point) and a second TRP; receiving a first PDSCH (Physical Downlink Control CHannel) from the first TRP and receiving a second PDSCH from the second TRP based on the received at least one downlink control information based on the received at least one downlink control information; and combining the received first PDSCH and the received second PDSCH.

Description

A method and apparatus for transmitting and receiving data in a wireless communication network {METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN A WIRELESS COMMUNICATION}

The present disclosure relates to a wireless communication system, and relates to a method and apparatus for transmitting and receiving data in a wireless communication system.

Efforts are being made to develop an improved 5G (5th generation) communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G (4th generation) communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, the 60 giga (70 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, 5G communication systems include beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO). ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in 5G communication system, evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed. In addition, in 5G systems, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans create and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, etc., is also emerging. In order to implement IoT, technological elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. . The application of a cloud radio access network (cloud RAN) as the big data processing technology described above can be said as an example of the convergence of 3eG technology and IoT technology.

As described above, with the development of wireless communication systems, a data transmission/reception scheme for network cooperative communication is required.

The present disclosure provides a method of transmitting and receiving data in a wireless communication network.

According to an embodiment of the present disclosure, there is provided a communication method of a terminal in a wireless communication system, the method comprising: receiving a higher layer signal including repetitive transmission-related setting information; Receiving downlink control information of at least one of a first transmission and reception point (TRP) and a second TRP; Receiving a first PDSCH (Physical Downlink Control CHannel) from the first TRP, and receiving a second PDSCH from the second TRP, based on the received at least one downlink control information; And combining the received first PDSCH and the received second PDSCH. In addition, the first PDSCH and the second PDSCH may perform the same TB (Transport Block).

According to the present disclosure, in a wireless communication system, a base station can provide efficient data transmission to a terminal.

1 is a time-frequency domain of a wireless communication system similar to LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), NR or similar according to an embodiment of the present disclosure It is a diagram showing a transmission structure.
2 is a view showing a frame, subframe, slot structure in 5G (5 ^th generation), according to one embodiment of the present disclosure.
3 illustrates a configuration of a bandwidth part (BWP) in a wireless communication system according to an embodiment of the present disclosure.
FIG. 4 is a diagram illustrating a partial indication and change of a bandwidth in a wireless communication system according to an embodiment of the present disclosure.
5 is a diagram illustrating a control region setting of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.
6 is a diagram illustrating PDSCH frequency axis resource allocation in a wireless communication system according to an embodiment of the present disclosure.
7 is a diagram illustrating a physical downlink shared channel (PDSCH) time axis resource allocation in a wireless communication system according to an embodiment of the present disclosure.
8 is a diagram illustrating PDSCH time axis resource allocation according to subcarrier intervals of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure.
9 is a diagram illustrating a structure of a slot format in a wireless communication system according to an embodiment of the present disclosure.
10 is a diagram illustrating slot aggregation in a wireless communication system according to an embodiment of the present disclosure.
11 is a diagram illustrating an antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
12 is a diagram illustrating a configuration of downlink control information (DCI) for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.
13 is a diagram illustrating repetitive transmission of a plurality of transmission and reception points (TRP) to which various resource allocation methods are applied in a wireless communication system according to an embodiment of the present disclosure.
14 is a diagram illustrating a method of repetitive PDSCH transmission using a plurality of transmission and reception points (TRP) in a wireless communication system according to an embodiment of the present disclosure.
15 is a diagram illustrating a terminal structure in a wireless communication system according to an embodiment of the present disclosure.
16 is a diagram illustrating a structure of a base station in a wireless communication system according to an embodiment of the present disclosure.
17 is a diagram illustrating a data transmission method according to an embodiment of the present disclosure.
18 is a diagram illustrating a method of applying cross-carrier scheduling according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

In describing the embodiments of the present disclosure, descriptions of technical contents that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure by omitting unnecessary description.

For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated. In addition, the size of each component does not fully reflect the actual size. The same reference numerals are assigned to the same or corresponding components in each drawing.

Advantages and features of the present disclosure, and a method of achieving them will be apparent with reference to embodiments described later in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only the embodiments of the present disclosure make the present disclosure complete, and common knowledge in the technical field to which the present disclosure pertains. It is provided to fully inform the holder of the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

At this time, it will be appreciated that each block of the flowchart diagrams and combinations of the flowchart diagrams may be executed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are described in the flowchart block(s). It creates a means to perform functions. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It may also be possible to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block(s). Since computer program instructions can also be mounted on a computer or other programmable data processing equipment, a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. Instructions to perform processing equipment may also be capable of providing steps for executing the functions described in the flowchart block(s).

In addition, each block may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks shown in succession may in fact be executed substantially simultaneously, or the blocks may sometimes be executed in the reverse order depending on the corresponding function.

At this time, the term'~ unit' used in this embodiment refers to software or hardware components such as field programmable gate array (FPGA) or application specific integrated circuit (ASIC), and'~ unit' performs certain roles. do. However,'~ part' is not limited to software or hardware. The'~ unit' may be configured to be in an addressable storage medium, or may be configured to reproduce one or more processors. Accordingly, according to an embodiment,'~ unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and programs. Includes procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. Components and functions provided in the'~ units' may be combined into a smaller number of elements and'~ units', or may be further separated into additional elements and'~ units'. In addition, components and'~ units' may be implemented to play one or more CPUs in a device or a security multimedia card. In addition, according to an embodiment, the'~ unit' may include one or more processors.

Hereinafter, the operating principle of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description of the present disclosure, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification. Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Of course, it is not limited to the above example.

Hereinafter, the present disclosure describes a technique for a terminal to receive broadcast information from a base station in a wireless communication system. The present disclosure relates to a communication technique and a system for fusing a 5th generation (5G) communication system with Internet of Things (IoT) technology to support a higher data rate after a 4G (4th generation) system. This disclosure is based on 5G communication technology and IoT-related technologies, and intelligent services (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail, security and safety related services, etc. ) Can be applied.

In the following description, a term referring to broadcast information, a term referring to control information, a term related to communication coverage, a term referring to a state change (e.g., event), and network entities A term referring to, a term referring to messages, a term referring to a component of a device, and the like are exemplified for convenience of description. Accordingly, the present disclosure is not limited to terms to be described later, and other terms having an equivalent technical meaning may be used.

For convenience of description below, some terms and names defined in the 3GPP 3rd generation partnership project long term evolution (LTE) standard may be used. However, the present disclosure is not limited by the terms and names, and may be equally applied to systems conforming to other standards.

The wireless communication system deviated from the initial voice-oriented service, for example, 3GPP HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced. (LTE-A), LTE-Pro, 3GPP2's High Rate Packet Data (HRPD), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. It is developing into a communication system.

As a representative example of a broadband wireless communication system, the LTE system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in downlink (DL), and Single Carrier Frequency Division Multiple Access (SC-FDMA) in uplink (UL). ) Method is adopted. Uplink refers to a radio link through which a terminal (UE (User Equipment) or MS (Mobile Station)) transmits data or control signals to a base station (eNode B or base station (BS)), and downlink refers to a base station It means a wireless link that transmits data or control signals. The multiple access method as described above divides the data or control information of each user by assigning and operating time-frequency resources to carry data or control information for each user so that they do not overlap with each other, that is, orthogonality is established. .

As a future communication system after LTE, that is, a 5G communication system must be able to freely reflect various requirements such as users and service providers, services that satisfy various requirements must be supported. Services considered for 5G communication systems include Enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communciation (URLLC). Etc.

According to an embodiment, eMBB aims to provide a data transmission speed that is more improved than the data transmission speed supported by the existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a maximum transmission rate of 20 Gbps in downlink and 10 Gbps in uplink from the viewpoint of one base station. At the same time, an increased user perceived data rate must be provided. In order to satisfy these requirements, it is required to improve the transmission and reception technology, including more advanced multi-input multi-output (MIMO) transmission technology. In addition, by using a frequency bandwidth wider than 20 MHz in a frequency band of 3 to 6 GHz or 6 GHz or higher instead of the 2 GHz band used by the current LTE, the data transmission speed required by the 5G communication system can be satisfied.

At the same time, mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC may require large-scale terminal access support within a cell, improved terminal coverage, improved battery time, and reduced terminal cost. The IoT is attached to various sensors and various devices to provide communication functions, so it must be able to support a ^{large number of terminals (for example, 1,000,000 terminals/km 2) within a cell.} In addition, because the terminal supporting mMTC is highly likely to be located in a shaded area not covered by the cell, such as the basement of a building due to the nature of the service, it may require wider coverage than other services provided by the 5G communication system. A terminal supporting mMTC must be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time may be required.

Finally, in the case of URLLC, as a cellular-based wireless communication service used for a specific purpose (mission-critical), remote control, industrial automation, and As a service used for unmaned unmanned aerial vehicles, remote health care, emergency alerts, etc., communication that provides ultra-low latency and ultra-reliability must be provided. For example, a service supporting URLLC must satisfy an air interface latency of less than 1 millisecond, and at the same time have a requirement of a packet error rate of ^{10 -5 or less.} Therefore, for a service supporting URLLC, a 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, a design requirement to allocate a wide resource in a frequency band is required. However, the aforementioned mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the above-described examples.

Services considered in the 5G communication system described above should be provided by fusion with each other based on one framework. That is, for efficient resource management and control, it is preferable that each service is integrated into one system, controlled, and transmitted rather than independently operated.

In addition, although an embodiment of the present disclosure will be described below using an LTE, LTE-A, LTE Pro, or NR system as an example, the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person with skilled technical knowledge.

The present disclosure relates to a method and apparatus for repeatedly transmitting data and control signals between a plurality of transmission nodes and terminals performing cooperative communication in order to improve communication reliability.

According to the present disclosure, when network cooperative communication is used in a wireless communication system, reliability of terminal reception data/control signals may be improved.

Hereinafter, the frame structure of the 5G system will be described in more detail with reference to the drawings.

1 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource domain through which data or control channels are transmitted in a 5G system according to an embodiment of the present disclosure.

Referring to FIG. 1, in FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The basic unit of a resource in the time and frequency domain is a resource element (RE, 1-01), 1 OFDM (Orthogonal Frequency Division Multiplexing) symbol (1-02) on the time axis and 1 subcarrier (Subcarrier) on the frequency axis ( 1-03). In the frequency domain, N_sc ^RBs (eg, 12) consecutive REs may constitute one resource block (Resource Block, RB, 1-04).

2 is a diagram illustrating a frame, subframe, and slot structure in 5G according to an embodiment of the present disclosure.

)=14). 1 서브프레임(2-01)은 하나 또는 복수 개의 슬롯(2-02, 2-03)으로 구성될 수 있으며, 1 서브프레임(2-01)당 슬롯(2-02, 2-03)의 개수는 부반송파 간격에 대한 설정 값 μ(2-04, 2-05)에 따라 다를 수 있다. 도 2의 일 예에서는 부반송파 간격 설정 값으로 μ=0(2-04)인 경우와 μ=1(2-05)인 경우가 도시되어 있다. μ=0(2-04)일 경우, 1 서브프레임(2-01)은 1개의 슬롯(2-02)으로 구성될 수 있고, μ=1(2-05)일 경우, 1 서브프레임(2-01)은 2개의 슬롯(2-03)으로 구성될 수 있다. 즉 부반송파 간격에 대한 설정 값 μ에 따라 1 서브프레임 당 슬롯 수(

)가 달라질 수 있고, 이에 따라 1 프레임 당 슬롯 수(

)가 달라질 수 있다. 각 부반송파 간격 설정 μ에 따른

및

는 하기의 <표 1>과 같이 정의될 수 있다.Referring to FIG. 2, FIG. 2 shows an example of a structure of a frame (Frame, 2-00), a subframe (Subframe, 2-01), and a slot (Slot, 2-02). One frame (2-00) may be defined as 10 ms. One subframe 2-01 may be defined as 1 ms, and thus, one frame 2-00 may consist of a total of 10 subframes 2-01. One slot (2-02, 2-03) may be defined as 14 OFDM symbols (that is, the number of symbols per slot (

)=14). One subframe (2-01) may be composed of one or a plurality of slots (2-02, 2-03), and the number of slots (2-02, 2-03) per subframe (2-01) May be different according to the setting value μ(2-04, 2-05) for the subcarrier spacing. In the example of FIG. 2, a case of μ = 0 (2-04) and a case of μ = 1 (2-05) as subcarrier spacing setting values are illustrated. When μ=0 (2-04), 1 subframe (2-01) may consist of 1 slot (2-02), and when μ=1 (2-05), 1 subframe (2 -01) may be composed of two slots (2-03). That is, the number of slots per subframe (

) May vary, and the number of slots per frame (

) Can be different. According to each subcarrier spacing setting μ

And

May be defined as shown in Table 1 below.

[Table 1]

In NR, one component carrier (CC) or serving cell may be configured with a maximum of 250 resource blocks (RBs). Therefore, when the terminal always receives the entire serving cell bandwidth like LTE, the power consumption of the terminal can be extreme, and to solve this, the base station sets one or more bandwidth parts (BWP) to the terminal. Thus, it is possible to support the UE to change the reception area within the cell. In NR, the base station may set the'initial BWP', which is the bandwidth of CORESET #0 (or common search space, CSS), to the terminal through the MIB. Thereafter, the base station may set an initial BWP (first BWP) of the terminal through RRC signaling, and may provide at least one or more BWP configuration information that may be indicated through downlink control information (DCI) in the future. Thereafter, the base station can indicate which band the terminal will use by notifying the BWP ID through DCI. If the terminal does not receive the DCI in the currently allocated BWP for more than a specific time, the terminal may attempt to receive DCI by returning to the'default BWP'. According to an embodiment, the'default BWP' may be the same as or different from the'initial BWP'.

3 illustrates a partial configuration of a bandwidth in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 3, FIG. 3 shows that the terminal bandwidth 3-00 is set to two bandwidth parts (BandWidth Part: BWP), that is, a bandwidth part #1 (3-05) and a bandwidth part #2 (3-10). An example is shown. The base station may set one or a plurality of bandwidth portions to the terminal, and may set information as shown in Table 2 below for each bandwidth portion.

[Table 2]

Of course, it is not limited to the above example, and in addition to the configuration information described in Table 2, various parameters related to the bandwidth portion may be set to the terminal. The above-described information can be delivered from the base station to the terminal through higher layer signaling, for example, RRC signaling. At least one bandwidth portion among the set one or a plurality of bandwidth portions may be activated. Whether or not to activate the configured bandwidth portion may be transmitted from the base station to the terminal in a semi-static manner through RRC signaling, or may be dynamically transmitted through a MAC control element (CE) or downlink control information (DCI).

The configuration of the bandwidth part supported by the 5G communication system can be used for various purposes.

According to an embodiment, when the bandwidth supported by the terminal is smaller than the system bandwidth, only the bandwidth supported by the terminal may be set through the setting of the bandwidth portion. For example, in <Table 2>, the frequency position of the bandwidth portion is set to the terminal, so that the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

In addition, according to an embodiment, for the purpose of supporting different neurology, the base station may set a plurality of bandwidth portions to the terminal. For example, in order to support both data transmission and reception using a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz to an arbitrary terminal, two bandwidth portions may be set to use subcarrier spacings of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be FDM (Frequency Division Multiplexing), and when data is to be transmitted/received at a specific subcarrier interval, a bandwidth portion set at the corresponding subcarrier interval may be activated.

In addition, according to an embodiment, for the purpose of reducing power consumption of the terminal, the base station may set a bandwidth portion having different bandwidths to the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits/receives data through the corresponding bandwidth, it may cause very large power consumption. In particular, it may be very inefficient in terms of power consumption for the UE to monitor an unnecessary downlink control channel for a large bandwidth of 100 MHz in a situation where there is no traffic. Therefore, for the purpose of reducing power consumption of the terminal, the base station may set a bandwidth portion of a relatively small bandwidth to the terminal, for example, a bandwidth portion of 20 MHz. In a situation where there is no traffic, the UE can perform a monitoring operation in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instruction of the base station.

4 is a diagram illustrating a partial indication and change of a bandwidth in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 4, as described in <Table 2> above, a base station may set one or a plurality of bandwidth portions to a terminal, and as settings for each bandwidth portion, the bandwidth of the bandwidth portion, the frequency position of the bandwidth portion, Information about the numerology of the bandwidth portion may be notified to the terminal. In FIG. 4, two bandwidth parts, bandwidth part #1 (BPW#1, 4-05) and bandwidth part #2 (BWP#2, 4-10) are set within the terminal bandwidth (4-00) for one terminal. An example is shown. Among the set bandwidths, one or a plurality of bandwidth portions may be activated, and in FIG. 4, an example in which one bandwidth portion is activated may be considered. In FIG. 4, the bandwidth part #1 (4-02) is activated among the bandwidth parts set in slot #0 (4-25), and the terminal is a control area set in the bandwidth part #1 (4-05). Physical downlink control channel (PDCCH) can be monitored in #1 (4-45), and data (4-55) can be transmitted and received in bandwidth part #1 (4-05). The control region in which the UE receives the PDCCH may be different depending on which of the set bandwidth parts is activated, and accordingly, the bandwidth at which the UE monitors the PDCCH may vary.

The base station may additionally transmit an indicator for changing the configuration of the bandwidth portion to the terminal. Here, changing the setting for the bandwidth portion may be regarded as the same as an operation of activating a specific bandwidth portion (eg, changing the activation from the bandwidth portion A to the bandwidth portion B). The base station can transmit a configuration switching indicator to the terminal in a specific slot, and the terminal determines the part of the bandwidth to be activated by applying the changed configuration according to the configuration change indicator from a specific point after receiving the configuration change indicator from the base station. And, it is possible to perform monitoring on the PDCCH in the control region set in the active bandwidth portion.

In FIG. 4, the base station provides a configuration change indicator (Configuration Switching Indication, 4-15) instructing the UE to change the active bandwidth part from the existing bandwidth part #1 (4-05) to the bandwidth part #2 (4-10). It can be transmitted in slot #1 (4-30). After receiving the configuration change indicator, the terminal may activate bandwidth part #2 (6-10) according to the content of the indicator. At this time, a transition time (4-20) for changing the bandwidth portion may be required, and accordingly, a time point in which the activated bandwidth portion is changed and applied may be determined. In FIG. 4, a case in which a transition time of 1 slot 4-20 is required after receiving the setting change indicator 4-15 is illustrated. Data transmission/reception may not be performed during the transition time (4-20) (4-60). Accordingly, the bandwidth portion #2 (4-10) is activated in the slot #2 (4-35), and an operation in which the control channel and data are transmitted/received to the corresponding bandwidth portion may be performed.

The base station may pre-set one or more bandwidth parts to the terminal by higher layer signaling (e.g., RRC signaling), and the configuration change indicator (4-15) is activated by mapping with one of the bandwidth part settings preset by the base station. Can be ordered. For example, _{an indicator of [log 2} N] bits may select and indicate one of N preset bandwidth portions. In Table 3 below, an example of indicating setting information for a bandwidth portion using a 2-bit indicator is described.

[Table 3]

The configuration change indicator 4-15 for the bandwidth portion described in FIG. 4 is in the form of medium access control (MAC) control element (CE) signaling or L1 signaling (eg, common DCI, group-common DCI, terminal-specific DCI). It can be transmitted from the base station to the terminal. Of course, it is not limited to the above example.

In accordance with the setting change indicator 4-15 for the bandwidth portion described in FIG. 4, at what point in time when the bandwidth portion activation is applied may depend on the following. From what point the configuration change is applied depends on a predefined value (e.g., applied from after the N (≥1) slot after receiving the configuration change indicator), or the base station is set to higher layer signaling (e.g., RRC signaling) to the terminal Alternatively, it may be transmitted by being partially included in the content of the setting change indicator 4-15. Alternatively, it may be determined by a combination of the above-described methods. After receiving the configuration change indicator 4-15 for the bandwidth portion, the terminal may apply the changed configuration from the time point obtained by the above-described method.

Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the drawings.

5 is a diagram illustrating a control region setting of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 5, in FIG. 5, two control regions (control region #1 (5-01), control region in one slot 5-20) in a frequency axis and a bandwidth portion 5-10 of the terminal as a time axis. An example in which #2(5-02)) is set is shown. The control regions 5-01 and 5-02 may be set in a specific frequency resource 5-03 within the entire terminal bandwidth portion 5-10 on the frequency axis. The control regions 5-01 and 5-02 may be set as one or a plurality of OFDM symbols on the time axis, and may be defined as a control region length (Control Resource Set Duration, 5-04). In the example of FIG. 5, control region #1 (5-01) is set to the length of the control region of two symbols, and control region #2 (5-02) is set to the length of the control region of one symbol.

The above-described control region in 5G may be configured by the base station through higher layer signaling to the terminal (eg, system information, master information block (MIB), radio resource control (RRC) signaling). Setting the control region to the terminal means that information such as a control region identifier (Identity), a frequency position of the control region, and a symbol length of the control region is provided to the terminal. For example, the information in <Table 4> may be included.

[Table 4]

In <Table 4>, the tci-StatesPDCCH (simply named TCI state) configuration information is one or more SSs (Synchronization Signals) in a relationship between a DMRS (Demodulation Reference Signal) and a QCL (Quasi Co Located) transmitted from the corresponding control region. )/PBCH (Physical Broadcast Channel) block index or CSI-RS (Channel State Information Reference Signal) index information may be included.

Next, downlink control information (DCI) in NR will be described in detail. In the NR, scheduling information for uplink data (or physical uplink data channel (Physical Uplink Shared Channel, PUSCH)) or downlink data (or physical downlink data channel (Physical Downlink Shared Channel, PDSCH)) in the NR is transmitted to the base station through DCI. It is transmitted from to the terminal. For efficient control channel reception by the terminal, various types of DCI formats are provided according to the purpose as shown in Table 5 below.

[Table 5]

The UE may monitor a DCI format for a countermeasure (Fallback or Fallback) and a DCI format for a non-fallback (Non-fallback or non-fallback) for PUSCH or PDSCH. The DCI format for countermeasures may consist of a fixed field predefined between the base station and the terminal, and the DCI format for non-preparation countermeasures may include a configurable field.

DCI may be transmitted through a physical downlink control channel (PDCCH) through a channel coding and modulation process. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC is scrambling with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the terminal. Different RNTIs are used according to the purpose of the DCI message, for example, UE-specific data transmission, power control command, or random access response. That is, the RNTI is not explicitly transmitted, but is included in the CRC calculation process and transmitted. Upon receiving the DCI message transmitted on the PDCCH, the UE checks the CRC using the allocated RNTI, and if the CRC check result is correct, the UE can know that the message has been transmitted to the UE.

For example, DCI scheduling a PDSCH for system information (SI) may be scrambled with SI-RNTI. DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI. DCI providing a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. DCI providing TPC (Transmit Power Control) can be scrambled with TPC-RNTI. DCI providing INT (Interruption) for a downlink data channel can be scrambled with INT-RNTI.

The DCI scheduling the UE-specific PDSCH or PUSCH may be scrambled with a Cell RNTI (C-RNTI).

The DCI format 0_0 may be used as a fallback DCI for scheduling the PUSCH, and in this case, the CRC may be scrambled with C-RNTI. DCI format 0_0 in which CRC is scrambled with C-RNTI may include, for example, the information in Table 6 below.

[Table 6]

DCI format 0_1 may be used as a non-fallback DCI for scheduling PUSCH, and in this case, CRC may be scrambled with C-RNTI. DCI format 0_1 in which CRC is scrambled with C-RNTI may include, for example, information in Table 7 below.

[Table 7]

DCI format 1_0 may be used as a countermeasure DCI for scheduling the PDSCH, and in this case, the CRC may be scrambled with C-RNTI. DCI format 1_0 in which CRC is scrambled with C-RNTI may include, for example, information in Table 8 below.

[Table 8]

DCI format 1_1 may be used as a non-preparative DCI for scheduling the PDSCH, and in this case, the CRC may be scrambled with C-RNTI. DCI format 1_1 in which CRC is scrambled with C-RNTI may include, for example, information in Table 9 below.

[Table 9]

In NR, in addition to allocation of frequency axis resource candidates through BWP indication, the following detailed frequency domain resource allocation (FDRA) methods may be provided through DCI.

6 is a diagram illustrating PDSCH frequency axis resource allocation in a wireless communication system according to an embodiment of the present disclosure.

6, if the terminal is configured to use only resource type 0 through higher layer signaling (6-00), some downlink control information (DCI) for allocating a PDSCH to the corresponding terminal is N _RBG It has a bitmap composed of three bits. Conditions for this will be described later. At this time, N _RBG means the number of resource block groups (RBG) determined as shown in <Table 10> below according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size. As a result, data is transmitted to the RBG indicated by 1.

[Table 10]

개의 비트들로 구성되는 주파수 축 자원 할당 정보를 가질 수 있다. 기지국은 이를 통하여 starting VRB(6-20)와 이로부터 연속적으로 할당되는 주파수 축 자원의 길이(6-25)를 설정할 수 있다.If the terminal is configured to use only resource type 1 through higher layer signaling (6-05), some DCIs that allocate PDSCH to the corresponding terminal

It may have frequency axis resource allocation information consisting of four bits. Through this, the base station may set the starting VRB 6-20 and the length of the frequency axis resources continuously allocated therefrom (6-25).

If the UE is configured to use both resource type 0 and resource type 1 through higher layer signaling (6-10), some DCIs that allocate PDSCH to the UE are payload for setting resource type 0 (6-15) It has frequency axis resource allocation information consisting of bits of a larger value (6-35) among payloads (6-20, 6-25) for setting resource type 1. The conditions for this will be described again later. At this time, one bit may be added to the first part (MSB) of the frequency axis resource allocation information within the DCI, and if the corresponding bit is 0, it indicates that resource type 0 is used, and if it is 1, it indicates that resource type 1 is used. can do.

7 is a diagram illustrating a physical downlink shared channel (PDSCH) time axis resource allocation in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 7, the base station includes subcarrier intervals (μ _PDSCH, μ _PDCCH ) of a data channel and a control channel set through an upper layer, a scheduling offset (K ₀ ) value, and The time axis position of the PDSCH resource may be indicated according to the OFDM symbol start position (7-00) and the length (7-05) in one slot (7-10) dynamically indicated through DCI.

8 is a diagram illustrating PDSCH time axis resource allocation according to subcarrier intervals of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 8, when the subcarrier intervals of the data channel and the control channel are the same (8-00, μ _PDSCH = μ _PDCCH )), the slot number for data and control are the same, so that the base station and the terminal are predetermined. It can be seen that a scheduling offset occurs according to the slot offset K _0. On the other hand, if the subcarrier spacing of the data channel and the control channel is different (8-05, μ _PDSCH ≠ μ _PDCCH ), the slot number for data and control is different, so the base station and the UE set the subcarrier spacing of the PDCCH. As a reference, it can be seen that a scheduling offset occurs in accordance with a predetermined slot offset K _0.

Next, a part of the decoding process for the PDSCH scheduled from NR to DCI will be described in detail.

Through DCI, the UE is instructed by the modulation and coding scheme (MCS) of the PDSCH along with information on frequency and time resources allocated for the PDSCH. The MCS field of DCI indicates an index for one table selected through an upper layer among the following three tables <Table 11>, <Table 12>, and <Table 13>. The range of the index indicated during initial transmission and HARQ retransmission may be different.In the initial transmission, indexes 0 to 28 in <Table 11>, indexes 0 to 27 in <Table 12>, and indexes 0 to 28 in <Table 13> are For retransmission, indexes 29 to 31 of <Table 11>, indexes 28 to 31 of <Table 12>, and indexes 29 to 31 of <Table 13> are used. The index indicated during initial transmission includes information on the modulation order and target code rate of the transmitted PDSCH, and the index indicated during retransmission includes information on the modulation order of the transmitted PDSCH.

[Table 11] MCS index table 1 for PDSCH

[Table 12]

MCS index table 2 for PDSCH

[Table 13]

MCS index table 3 for PDSCH

In the case of initial transmission, the UE needs to know the size of a transport block (TB) before the scheduled PDSCH is encoded. For this, the following process is performed, and if two TBs are transmitted, the following process is performed for each of the codewords.

와 같이 계산한다. PDSCH 전송에 할당된 총 RE 수를 계산하기 위한 수식에서

는 한 PRB 내 subcarrier 수인 12를 가리키며,

는 한 슬롯 내 PDSCH가 스케줄 된 심볼 수를 가리킨다. 또한,

는 PRB 내 DM-RS를 위해 할당 된 RE 수를 가리키며, 여기에는 DCI상의 DM-RS CDM groups without data에 지시된 오버헤드가 포함된다. 또한,

는 상위 레이어로 지시된 오버헤드 값을 가리킨다. 다음으로, 스케줄 된 PRB 전체에 대한 총 RE 수를

와 같이 계산하며, 스케줄 된 PRB 전체에 대한 총 RE 수를 계산하는 수식에서 n_PRB 는 단말로의 PDSCH 전송을 위해 할당된 총 PRB수를 가리킨다.-Process 1) The UE calculates the total number of resource elements (REs) allocated for PDSCH transmission in one slot in which the PDSCH is scheduled and a physical resource block (PRB).

Calculate as In the formula for calculating the total number of REs allocated for PDSCH transmission

Refers to 12, the number of subcarriers in a PRB,

Indicates the number of symbols in which the PDSCH is scheduled in one slot. Also,

Denotes the number of REs allocated for the DM-RS in the PRB, and this includes the overhead indicated in the DM-RS CDM groups without data on the DCI. Also,

Indicates the overhead value indicated to the upper layer. Next, the total number of REs for the entire scheduled PRB

In the formula for calculating the total number of REs for the entire scheduled PRB, n _PRB indicates the total number of PRBs allocated for PDSCH transmission to the terminal.

와 같이 계산되며, 여기서 R,

은 각각 MCS로 지시된 target rate와 modulation order를 가리키며,

는 레이어 개수를 가리킨다.-Process 2) The intermediate number of information bit in the PDSCH is

Is calculated as, where R,

Denotes the target rate and modulation order indicated by MCS, respectively,

Indicates the number of layers.

-Step 3) If the calculated N _info value is greater than 3824, the terminal determines that a plurality of code blocks can be transmitted (step 5), and if not, the terminal determines that a single code block is transmitted (step 4).

,where

을 계산한 뒤 <표 14>에서 N'_info 보다 작지 않은 최소 TBS(Transport Block Size)를 찾는다. 단말이 찾은 TBS가 단말이 판단한 TB(Transport Block) 크기가 된다.-Step 4) When the terminal determines that a single code block is transmitted, the terminal

,where

After calculating the <Table 14> In Find N 'minimum (Transport Block Size) is not less than TBS _info. The TBS found by the terminal becomes the TB (Transport Block) size determined by the terminal.

,where

, 값 및 타겟 코드 레이트(target code rate)에 따라 다음 과정을 수행한다:-Step 5) If the terminal determines that multiple code blocks can be transmitted, the terminal

,where

Depending on the value of, and the target code rate, perform the following steps:

, where

이며, 계산된 TBS가 코드 블록 의 개수를 가리킨다. -Step 5-1) In case of target code rate ≤ 1/4:

, where

And the calculated TBS indicates the number of code blocks.

, where

이며, 계산된 TBS가 코드 블록의 개수를 가리킨다. 반대의 경우이면

이며, 단일 코드 블록이 전송된다.- the process 5-2) if Target code rate> 1/4 of: if ten thousand and one N _'info> 8424

, where

And the calculated TBS indicates the number of code blocks. In the opposite case

And a single code block is transmitted.

[Table 14]

Meanwhile, in the case of retransmission, it is assumed that the TB size of the retransmitted PDSCH is the same as the TB size calculated at the time of initial transmission.

9 is a diagram illustrating a structure of a slot format in a wireless communication system according to an embodiment of the present disclosure.

Rel-15 NR provides a frequency division duplexing (FDD) system using separate downlink and uplink frequencies and a time division duplexing (TDD) system using both downlink and uplink frequencies. In the TDD situation, the UE needs to know in advance whether a specific slot or symbol is a downlink symbol or an uplink symbol in order to communicate with the base station. Therefore, NR provides three types of symbol types, which are as follows.

-Downlink symbol

-Uplink symbol

-Flexible symbol: a symbol that can be used as a downlink symbol or an uplink symbol

In addition, the terminal may finally determine whether the symbol is a downlink symbol, an uplink symbol, or a flexible symbol in the following four steps.

-Step 1: Common RRC signaling

The system information block (SIB) informs the common terminal of the symbol configuration within the slot for each specific slot period. It informs the number of downlink slots, the number of downlink symbols and the number of uplink slots, and the number of uplink symbols that exist within a specific period. All slots or symbols not indicated as uplink or downlink are regarded as flexible slots or flexible symbols. In NR, tdd-UL-DL-ConfigurationCommon is regarded as phase 1 signaling.

-Step 2: UE-specific RRC signaling

In step 1, uplink symbol or downlink symbol information is additionally provided for flexible slots or symbols. For the flexible slots or symbols determined in step 1, even in step 2, all slots or symbols without information on uplink or downlink are considered to be flexible slots or symbols. Step 2 may be omitted depending on the terminal. In other words, the downlink symbol or the uplink symbol determined in step 1 cannot be changed again by step 2. In NR, tdd-UL-DL-ConfigurationDedicated is regarded as stage 2 signaling.

-Step 3: Common L1 signaling

An uplink symbol, a downlink symbol, or a flexible symbol is additionally re-instructed by limiting to the flexible symbols determined by step 1 or step 2 by DCI format 2_0. Step 3 may be omitted depending on the terminal. In other words, the downlink symbol or the uplink symbol determined in step 1 or step 2 cannot be changed again by step 3. In NR, DCI format 2_0 is regarded as step 3 signaling.

-Step 4: UE-specific L1 signaling

An uplink symbol is determined by DCI format 0_x, which schedules uplink data by limiting to the flexible symbol or uplink symbols determined by step 1, step 2, or step 3 above. Alternatively, the downlink symbol is determined by DCI format 1_x scheduling downlink data limited to the flexible symbol or downlink symbols determined by step 1 or step 2 or step 3. In other words, the UE does not expect to schedule uplink data transmission according to DCI format 0_x for the downlink symbol determined in step 1, step 2, or step 3. In NR, DCI format 1_x or DCI format 0_x is regarded as step 4 signaling.

According to an embodiment of the present disclosure, among the above-described steps, step 3 or step 4 may be applied in a different order. Therefore, the UE does not expect that the uplink symbol indicated by step 4 is redirected to a flexible symbol or downlink symbol by step 3. In addition, the UE does not expect that the downlink symbol indicated in step 4 is redirected as a flexible symbol or uplink symbol in step 3. Therefore, the symbol indicated first by step 4 must be indicated by the exact same symbol in step 3 as well. A situation in which steps 1 to 3 are applied is shown as an example in FIG. 9. A downlink symbol (9-02), a flexible symbol (9-04), and an uplink symbol (9-06) may be set in one slot as in 9-00 by step 1 or step 2 of higher signaling. Thereafter, the UE may dynamically indicate an uplink symbol 9-12 and a downlink symbol 9-14 only for a flexible symbol link set by step 1 or step 2, such as 9-10 by step 3.

The following operation is established for the PDSCH scheduled by DCI format 1_0 or 1_1 in Rel-15 NR or the first SPS PDSCH scheduled by DCI format 1_0 or 1_1 indicating SPS activation.

-When the PDSCH is scheduled in a single slot for all cases in which the common L1 signaling of step 3 is set as a higher signal or not, the UE expects that the uplink symbol set by step 1 or step 2 does not overlap. That is, there should be no resource indicated as an uplink symbol by step 1 or step 2 in the PDSCH scheduled time resource region.

-When the common L1 signaling of step 3 is set as a higher signal or not, when a PDSCH that is repeatedly transmitted in a slot period is scheduled for all, the UE is the uplink symbol set by step 1 or step 2 and the PDSCH transmitted in a specific slot. When are overlapped, the terminal does not expect to receive the PDSCH in the corresponding slot. That is, the PDSCH reception is omitted.

-If the common L1 signaling in step 3 is configured, the terminal does not expect a case in which some of the time resource regions of the scheduled PDSCH are configured as uplink symbols in step 3. That is, the UE expects to receive the PDSCH scheduled for a time resource region set to a symbol other than an uplink symbol in step 3.

-If the common L1 signaling of step 3 is configured, the terminal expects that some of the time resource regions of the SPS PDSCH initially transmitted by the activation DCI indicating the SPS PDSCH are configured as an uplink or a flexible link by step 3 I never do that. That is, the UE expects to receive the first SPS PDSCH scheduled only for the time resource region set to downlink in step 3.

The following operation is established for the remaining SPS PDSCHs except for the first SPS PDSCH scheduled by DCI format 1_0 or 1_1 indicating SPS activation in Rel-15 NR.

-If the common L1 signaling of step 3 is not configured, if some of the resource regions of the SPS PDSCH that are repeatedly transmitted and received in a slot period are set as uplink symbols by step 1 or step 2, the terminal expects to receive the corresponding SPS PDSCH. And the base station does not transmit the corresponding SPS PDSCH.

-If the common L1 signaling of step 3 is configured and the terminal receives it correctly, the terminal overlaps with an uplink symbol or a flexible symbol indicated by common L1 signaling in some of the resource regions of the SPS PDSCH repeatedly transmitted and received in a slot period. If yes, the SPS PDSCH reception is not expected in the corresponding slot, and the base station does not transmit the SPS PDSCH. Specifically, if the base station transmits the common L1 signaling in step 3 and the terminal needs time to determine the reception and slot information, and this is called N2, the operation is performed at the point where N2 passes after receiving the common L1 signaling in step 3 This operation is applied when determining SPS PDSCH transmission/reception.

-If the common L1 signaling of step 3 is configured and the terminal does not receive it correctly, the terminal may have a part of the resource region of the SPS PDSCH repeatedly transmitted and received in a slot period, and the uplink symbol indicated by step 1 or step 2 or flexible When overlapping with the symbol, the UE does not expect to receive the SPS PDSCH in the corresponding slot. This operation requires time for the base station to transmit the common L1 signaling in step 3 and the terminal to determine the reception and slot information in detail, in addition to the situation in which the terminal has not correctly received the common L1 signaling in step 3, and this is called N2, This operation can also be applied when the common L1 signaling of step 3 is received and SPS PDSCH transmission/reception is determined before N2.

In the present disclosure, the specific meaning of describing that the terminal does not expect a specific situation is that when a specific situation occurs, the terminal regards it as an error case. In addition, it may mean that scheduling should be performed so that a situation not expected by the terminal from the viewpoint of the base station should occur.

10 is a diagram illustrating slot aggregation according to some embodiments in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 10, in NR, repetitive transmission of the same PDSCH is supported in order to improve the PDSCH reception reliability of the UE (10-00). The base station may set the number of repetitive transmissions of the PDSCH, e.g., pdsch-AggregationFactor in the PDSCH-Config, to an upper layer such as RRC, and when the number of repetitive transmissions is set, the PDSCH scheduled with DCI is in the same number of slots as the number of consecutive repetitions. It can be transmitted repeatedly (10-05). All of the repeatedly transmitted PDSCHs can be allocated the same time resource within the slot, which is indicated by the DCI in one slot (slot) OFDM symbol (symbol) start position (7-00), as shown in FIG. And length (7-05). In addition, it may be assumed that the same transport block (TB) is transmitted to all the repeatedly transmitted PDSCHs. The UE can expect that the repeatedly transmitted PDSCH is transmitted only in a single layer. In addition, the redundancy version (RV) of the repeatedly transmitted PDSCH may be determined according to the redundancy version (RV) value indicated in the DCI scheduling the PDSCH and the index of the repeatedly transmitted PDSCH as shown in Table 15 below.

[Table 15]

In <Table 15>, n may indicate an index for each PDSCH within the number of repetitive transmissions determined by the upper layer (10-10), (10-15).

Referring to the above-described DCI structure, PDSCH time/frequency resource allocation, and descriptions related to a PDSCH transmission and reception procedure performed based on the same, in release 15, NR uses only a single transmission point/panel/beam when repeatedly transmitting a PDSCH. If cooperative communication using multiple transmission points/panels/beams can be applied during repeated PDSCH transmission, more robust performance can be obtained, such as channel blockage, and thus multiple transmission points in NR release 16 Repetitive transmission techniques through /panel/beam are being actively discussed. At this time, in order to improve the reception reliability of the terminal, it is necessary to combine a transmission reception point (TRP)/transmission signal for each beam.

An embodiment of the present disclosure will be described in detail with the accompanying drawings. In addition, in describing the present disclosure, when it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

The base station is a subject that performs resource allocation of the terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In addition, an embodiment of the present disclosure will be described below using an NR or LTE/LTE-A system as an example, but an embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type. In addition, embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person having skilled technical knowledge.

The contents of the present disclosure are applicable to FDD and TDD systems.

In the present disclosure, higher signaling (or higher signal) is a signal transmission method that is transmitted from the base station to the terminal using a downlink data channel of the physical layer, or from the terminal to the base station using an uplink data channel of the physical layer, and RRC signaling , Or PDCP signaling, or a medium access control (MAC) control element (MAC control element; MAC CE).

In the present disclosure, the L1 signal is a type of signal transmitted from the base station to the terminal at the physical layer end, and may be interpreted as a specific field in DCI, DCI format, RNTI scrambled in CRC of DCI, CORESET or search space in which DCI is transmitted. Therefore, classifying by the L1 signal means classifying through the above examples.

In the present disclosure, in determining whether to apply cooperative communication, the UE has a specific format in which the PDCCH(s) for allocating the PDSCH to which cooperative communication is applied, or the PDCCH(s) for allocating the PDSCH to which the cooperative communication is applied, cooperative communication Includes a specific indicator indicating whether to apply, or the PDCCH(s) allocating a PDSCH to which cooperative communication is applied are scrambled with a specific RNTI, or assuming the application of cooperative communication in a specific section indicated by a higher layer, etc. It is possible to use methods. For the convenience of explanation later, it will be referred to as a Non-Coherent Joint Transmission (NC-JT) case that the UE receives the PDSCH to which cooperative communication is applied based on conditions similar to those described above.

Determining the priority between A and B in the present disclosure means selecting one having a higher priority according to a predetermined priority rule and performing an operation corresponding thereto, or performing an operation corresponding to the one having a lower priority. It can be mentioned in various ways, such as omitting or dropping an operation. Of course, it is not limited to the above example.

In the present disclosure, the examples are described through multiple embodiments, but these are not independent and one or more embodiments may be applied simultaneously or in combination.

Unlike the conventional 5G wireless communication system, it is possible to support not only a service requiring a high transmission rate, but also a service having a very short transmission delay and a service requiring a high connection density. In a wireless communication network including a plurality of cells, a transmission and reception point (TRP), or a beam, coordinated transmission between each cell, TRP or/and beam increases the strength of the signal received by the terminal or each cell, It is one of the element technologies that can satisfy various service requirements by efficiently performing TRP or/and inter-beam interference control.

Joint Transmission (JT) is a representative transmission technology for cooperative communication as described above, and supports one terminal through different cells, TRPs, or/and beams through the joint transmission technology to increase the strength of the signal received by the terminal. I can. On the other hand, since the characteristics of each cell, TRP or/and the beam and the channel between the terminal can be greatly different, different precoding, MCS, resource allocation, etc. need to be applied to each cell, TRP or/and the link between the beam and the terminal. . In particular, in the case of non-coherent joint transmission (NC-JT, Non-Coherent Joint Transmission) supporting non-coherent precoding between each cell, TRP or/and beam, each cell, TRP or/and It is important to configure individual down link (DL) transmission information for the beams. On the other hand, the setting of individual DL transmission information for each cell, TRP, or/and beam is a major factor that increases the payload required for DL DCI transmission, which is the reception of a physical downlink control channel (PDCCH) that transmits DCI. It can adversely affect performance. Therefore, it is necessary to carefully design a tradeoff between the amount of DCI information and the PDCCH reception performance in order to support JT.

11 is a diagram illustrating an antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 11, examples of radio resource allocation for each TRP according to a joint transmission (JT) technique and a situation are shown. 11-00 is an example of coherent joint transmission (C-JT) supporting coherent precoding between each cell, TRP, or/and beam. In C-JT, single data (PDSCH) is transmitted from TRP A (11-05) and TRP B (11-10) to the terminal 11-15, and joint precoding is performed in a plurality of TRPs. . This means that TRP A (11-05) and TRP B (11-10) transmit the same DMRS ports (for example, DMRS ports A and B in both TRPs) for receiving the same PDSCH. In this case, the UE will receive one DCI information for receiving one PDSCH demodulated by DMRS ports A and B.

11-20 are examples of non-coherent joint transmission (NC-JT) supporting non-coherent precoding between each cell, TRP or/and beam . In the case of NC-JT, a PDSCH is transmitted to the UEs 11-35 for each cell, TRP, or/and beam, and individual precoding may be applied to each PDSCH. Each cell, TRP, or/and beam transmits a different PDSCH to improve throughput compared to single cell, TRP, or/and beam transmission, or each cell, TRP, or/and beam repeatedly transmits the same PDSCH to a single cell, TRP Or/and it is possible to improve the reliability compared to beam transmission.

When all the frequency and time resources used by multiple TRPs for PDSCH transmission are the same (11-40), when the frequency and time resources used by multiple TRPs do not overlap at all (11-45), used by multiple TRPs Various radio resource allocations may be considered, such as when some of the frequency and time resources overlap (11-50). In each case of the above-described radio resource allocation, when multiple TRPs repeatedly transmit the same PDSCH to improve reliability, if the receiving terminal does not know whether the corresponding PDSCH is repeatedly transmitted, the corresponding terminal performs the combination of the corresponding PDSCH in the physical layer. Since (combining) cannot be performed, there may be limitations in improving reliability. Therefore, the present disclosure provides a repetitive transmission instruction and configuration method for improving NC-JT transmission reliability.

In order to simultaneously allocate a plurality of PDSCHs to one terminal for NC-JT support, DCIs of various types, structures, and relationships may be considered.

12 is a diagram illustrating a configuration of downlink control information (DCI) for cooperative communication in a wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 12, four examples of DCI design for NC-JT support are shown.

In FIG. 12, case #1 (12-00) is different in (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to serving TRP (TRP#0) used when transmitting a single PDSCH. In a situation in which (N-1) PDSCHs are transmitted, control information for PDSCHs transmitted in (N-1) additional TRPs is transmitted in the same format as control information for PDSCHs transmitted in serving TRP (same DCI format) This is an example. That is, all terminals (DCI#0 ~ DCI#(N-1)) different TRPs (TRP#0 ~ TRP#(N-1)) through DCIs having the same DCI format and the same payload. Control information on PDSCHs transmitted in may be obtained. In the above-described case #1, the degree of freedom for control (allocation) of each PDSCH can be completely guaranteed, but when each DCI is transmitted in a different TRP, a coverage difference for each DCI may occur, resulting in deterioration of reception performance.

In FIG. 12, case #2 (12-05) is different in (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to serving TRP (TRP#0) used when transmitting a single PDSCH. In a situation in which (N-1) PDSCHs are transmitted, control information for PDSCHs transmitted in (N-1) additional TRPs is in a different form from control information for PDSCHs transmitted in serving TRP (different DCI format or different DCI). This is an example that is transmitted as payload). For example, in the case of DCI#0, which transmits control information for the PDSCH transmitted in the serving TRP (TRP#0), all information elements of DCI format 1_0 to DCI format 1_1 are included, but cooperative TRP (TRP In the case of'shortened' DCI (sDCI#0~sDCI#(N-2)) transmitting control information for PDSCHs transmitted from #1 to TRP#(N-1)), the DCI format 1_0 to DCI format 1_1 It may contain only some of the information elements. According to an embodiment of the present disclosure, in the case of information not included in sDCI, DCI (DCI#0, normal DCI, nDCI) of serving TRP may be followed.

Therefore, in the case of sDCI that transmits control information for PDSCHs transmitted in the cooperative TRP, the payload is small compared to normal DCI (nDCI) that transmits PDSCH-related control information transmitted in the serving TRP, or less than nDCI. It is possible to include reserved bits as many as the number of bits. In case #2 described above, the degree of freedom for controlling (allocation) of each PDSCH may be limited according to the contents of the information element included in the sDCI, but since the reception performance of sDCI is superior to that of nDCI, the coverage difference for each DCI is increased. It may be less likely to occur.

In FIG. 12, case #3 (12-10) is different in (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than serving TRP (TRP#0) used when transmitting a single PDSCH. In a situation in which (N-1) PDSCHs are transmitted, control information for PDSCHs transmitted in (N-1) additional TRPs is in a different form from control information for PDSCHs transmitted in serving TRP (different DCI format or different DCI). This is another example that is transmitted as payload). For example, in the case of DCI#0, which transmits control information on the PDSCH transmitted from the serving TRP (TRP#0), all information elements of DCI format 1_0 to DCI format 1_1 are included, and cooperation TRP (TRP In the case of control information for PDSCHs transmitted from #1 to TRP#(N-1)), it is possible to collect and transmit only some of the information elements of DCI format 1_0 to DCI format 1_1 in one'secondary' DCI (sDCI). . For example, the sDCI may have at least one of HARQ-related information such as frequency domain resource assignment, time domain resource assignment, and MCS of cooperative TRPs. According to an embodiment of the present disclosure, in the case of information not included in sDCI, such as a bandwidth part (BWP) indicator or a carrier indicator, DCI (DCI#0, normal DCI, nDCI) of the serving TRP. ) Can be followed.

In case #3, the degree of freedom for controlling (allocation) of each PDSCH may be limited depending on the contents of the information element included in the sDCI, but the reception performance of sDCI can be adjusted and compared with case #1 or case #2, the terminal's The complexity of DCI blind decoding may be reduced.

In FIG. 12, case #4 (12-15) is different in (N-1) additional TRPs (TRP#1 to TRP#(N-1)) in addition to serving TRP (TRP#0) used when transmitting a single PDSCH. In a situation in which (N-1) PDSCHs are transmitted, control information for PDSCHs transmitted in (N-1) additional TRPs is in a DCI (long DCI, lDCI) such as control information for PDSCHs transmitted in the serving TRP. This is an example of sending. That is, the UE may obtain control information on PDSCHs transmitted in different TRPs (TRP#0 to TRP#(N-1)) through a single DCI. In case #4, the complexity of DCI blind decoding of the terminal may not increase, but the degree of freedom of PDSCH control (allocation) may be low, such as the number of cooperative TRPs is limited according to the long DCI payload limitation.

In the following descriptions and embodiments, sDCI may refer to various auxiliary DCIs such as shortened DCI, secondary DCI, or normal DCI (DCI format 1_0 to 1_1 described above) including PDSCH control information transmitted from the cooperative TRP, and has special restrictions. If not specified, the description is similarly applicable to the various auxiliary DCIs. In addition, the name of each DCI is only an example and is not limited to the example.

In the following description and embodiments, the above-described case #1, case #2, and case #3 in which more than one DCI (PDCCH) is used for NC-JT support are classified into multiple PDCCH-based NC-JTs, and NC- Case #4, in which a single DCI (PDCCH) is used for JT support, can be classified as a single PDCCH-based NC-JT.

In embodiments of the present disclosure, "cooperation TRP" may be replaced with various terms such as "cooperation panel" or "cooperation beam" when applied in practice.

In the embodiments of the present disclosure, "when NC-JT is applied" means "when a terminal receives more than one PDSCH at the same time in one BWP", "when a terminal simultaneously receives two or more TCIs (Transmission Configuration Indicator) In the case of receiving the PDSCH based on the indication", "when the PDSCH received by the terminal is associated with one or more DMRS port groups", it is possible to be variously interpreted according to the situation, but one for convenience of explanation Used as an expression.

In the present disclosure, a radio protocol structure for NC-JT may be used in various ways according to a TRP deployment scenario. For example, when there is no or small backhaul delay between cooperative TRPs, a structure based on MAC layer multiplexing may be used (CA-like method). On the other hand, when the backhaul delay between cooperative TRPs is large enough to be negligible (e.g., 2 ms or more is required for CSI exchange or scheduling information exchange between cooperative TRPs), an independent structure for each TRP from the RLC layer is used, which is robust against delay Can be secured (DC-like method).

In this embodiment, a detailed configuration and indication method for repeatedly transmitting a PDSCH having the same two or more TRPs in the same transmission band, such as a transmission band, a component carrier, and a BWP described in the above-described first embodiment, is provided. .

13 is a diagram illustrating repetitive transmission of a plurality of transmission and reception points (TRP) to which various resource allocation methods are applied in a wireless communication system according to an embodiment of the present disclosure. Referring to FIG. 13, an example in which two or more TRPs repeatedly transmit the same PDSCH is shown.

As described above, in the current Rel-15 NR, the number of slots equal to the number of repeated transmissions is required to repeatedly transmit the same PDSCH, and the same cell, TRP and/or beam are used for each repeated transmission. On the other hand, through the disclosed embodiment, higher reliability may be achieved by using different TRPs for each repetitive transmission in each slot (13-00, 13-05). Meanwhile, other repetitive transmission methods may be used depending on the capability of the terminal and the delay time requirement, and the state of available resources between TRPs. For example, when the UE has the capability to receive NC-JT, each TRP can increase the frequency resource utilization rate and reduce the delay time required for PDSCH decoding by using a method of transmitting the same PDSCH in the same time and frequency resource. (13-10, 13-15). This method is effective when the inter-TRP beams to be simultaneously transmitted are close to each other orthogonal, and thus there is little interference between the beams. As another example, each TRP may use a method of transmitting the same PDSCH at the same time and frequency resources that do not overlap each other (13-20, 13-25). This method is effective when the inter-beam interference of the TRP to be transmitted simultaneously is large, and the available frequency resources of each TRP are large. As another example, each TRP may use a method of transmitting the same PDSCH to different OFDM symbols in the same slot (13-30, 13-35). This method is effective when there are not many available frequency resources of each TRP and the size of data to be transmitted is small. In addition to the above-described methods, modifications based on the above-described methods may be possible.

In the above-described methods, a single DCI can be used to schedule repetitive transmission (13-00, 13-10, 13-20, 13-30), and the DCI can indicate a list of all TRPs that will participate in repetitive transmission. have. The list of TRPs to be repeatedly transmitted may be indicated in the form of a TCI state list, and the length of the TCI state list may be dynamically changed. The corresponding DCI may be repeatedly transmitted to improve reliability, and a different beam may be applied for each DCI during repeated transmission. Alternatively, multiple DCIs may be used to schedule repetitive transmission (13-05, 13-15, 13-25, 13-35), and each DCI may correspond to a PDSCH of a different TRP to participate in repetitive transmission. TRP for each DCI may be indicated in the form of a TCI state or a resource used for repeated transmission, and a more detailed description will be given in an embodiment to be described later. Alternatively, a shortened DCI may be used to schedule repetitive transmission, and each of the normal DCI and the secondary DCI may correspond to a PDSCH of a different TRP to participate in the repetitive transmission. The above-described indication method can be commonly applied to both repeated transmission through multiple TRPs and different data transmission through multiple TRPs.

<Example>

14 is a diagram illustrating a method of repeatedly transmitting a PDSCH using multiple transmission and reception points (TRP) in a wireless communication system according to an embodiment of the present disclosure.

The single DCI embodiment 14-00 of FIG. 14 shows an example in which the base station repeatedly transmits the same PDSCH from different TRPs using a single (single) DCI 14-05. TRP 1 transmits the PDSCH 14-10 to the terminal using the first four OFDM symbols, and TRP 2 repeatedly transmits the same PDSCH 14-15 to the terminal using four OFDM symbols thereafter. After receiving the two PDSCHs, the terminal may increase reception reliability through combining. The DCI may be transmitted from TRP 1 or TRP 2 to the UE, and as described above in FIG. 13, information indicating that the PDSCH is repeatedly transmitted through different TRPs may be included in the corresponding DCI information. The repeated transmission of the same PDSCH in the single DCI embodiment 14-00 of FIG. 14 is only an example, and it may be sufficiently possible that the repeated PDSCH transmission is transmitted in one slot or in different slots using different OFDM symbols. In addition, it may be sufficiently possible that one PDSCH is transmitted over different slots.

Repetitive transmission of the same PDSCH based on multiple TRPs in the single DCI embodiment (14-00) is repeated transmission in a form having the same slot-based symbol as described above in FIG. 10 or within the same slot as described above in FIGS. 13 to 14 (or Repetitive transmission may be supported in a form having different symbols (between slots), and a corresponding function may be selected by an upper signal or an L1 signal. A method of indicating repetitive transmission in single DCI is as at least one of the following.

-Number of repetitive transmissions: The number of repetitive transmissions is included in the DCI field. The time domain resource allocation field (TDRA) of the DCI indicates the start symbol and length of one PDSCH in the slot, and the number of repetitive transmissions indicates how many times the corresponding PDSCH is additionally transmitted. As another example, the repetitive transmission number field may be included as an additional column in the TDRA table instead of being separately present. The following <Table 16> is an example.

[Table 16]

-Number of TCI states: As described with reference to FIGS. 13 to 14, the UE may receive a set of one or more TCI states in advance as an upper signal (MAC CE) in order to transmit and receive data with a plurality of TRPs. Therefore, the size of the TCI state set (ie, the number of TCI states) is the number of repetitive transmissions of the PDSCH. Specifically, the number of repetitive transmissions of the PDSCH scheduled in the non-preparative DCI format 1_x may be the same as the number of TCI states. In addition, the number of repetitive transmissions of the PDSCH scheduled with the countermeasure DCI format 1_0 is 1. That is, it is a single transmission, not a repetitive transmission. As another example, the number of repetitive PDSCH transmissions may be a multiple value of the number of TCI states (ie, TCI state times X and X are natural numbers). In this situation, the X value may be determined by an upper signal or an L1 signal.

The multiple DCI embodiment 14-20 of FIG. 14 shows an example in which a terminal receives a plurality of DCIs and repeatedly receives the same PDSCH from different TRPs. Specifically, the terminal receives the schedule of the PDSCH (14-30) consisting of four OFDM symbols through the DCI (14-23) received from TRP 1, and after that 4 through the DCI (14-25) received from TRP 2 PDSCHs 14-35 consisting of four OFDM symbols are scheduled. The two PDSCHs are each scheduled by different DCIs, but have the same TB. Of course, it is not limited to the above example, and a situation in which two PDSCHs have different TBs may be sufficiently considered. After receiving the two PDSCHs, the UE can increase the reliability of reception through combining in the case of the same TB. Unlike repeated PDSCH transmission by multiple TRPs based on single DCI, in FIG. 14, the TRP in which DCI is transmitted and received and the TRP in which the PDSCH scheduled by the corresponding DCI is transmitted and received are assumed to be the same TRP. For reference, a method of determining whether the PDSCHs 14-30 and 14-35 scheduled in different DCIs 14-23 and 14-25 have the same TB or different TBs is as follows. .

-When the two DCIs have the same HARQ process number and NDI value, the two PDSCHs have the same TB. If at least one of the two has different values, the two PDSCHs have different TBs. The HARQ process number and NDI are only examples, and the DCI fields described above in FIG. 5 may be substituted and applied, such as a time resource allocation field or a frequency resource allocation field. For example, when the time and frequency resource regions of PDSCHs scheduled in the two DCIs overlap all or at least partially, the UE may determine that the TBs scheduled in the two DCIs are the same. Alternatively, if the values of Counter DAI or Total DAI are the same in two DCIs, it can be considered that PDSCHs scheduled in the two DCIs include the same TB. The determination condition as described above may be always specified in the standard or may be activated/deactivated by setting a higher signal.

-If the UE receives two DCIs having the same HARQ process number and the same NDI value in a situation in which slot-based repetitive transmission as a higher signal is previously set, the UE performs repetitive PDSCH transmission in the slot, and the transmission pattern in the slot It is considered to be transmitted repeatedly in this slot period. As an example, in 14-20 of FIG. 14, when the UE is configured for slot period repetitive transmission as a pre-higher signal and the number of repetitively transmitted slots is 2, the UE transmits/receives the PDSCH 14-30 and the PDSCH ( 14-35) are considered to be transmitted and received in the same symbol pattern in the next slot.

The repeated transmission of the same PDSCH in the multiple DCI embodiments 14-20 is only an example, and it may be sufficiently possible that the repeated PDSCH transmission is transmitted in one slot or in different slots using different OFDM symbols. In addition, it may be sufficiently possible that one PDSCH is transmitted over different slots. Repetitive transmission of the same PDSCH based on a plurality of DCI-based multiple TRPs is repeated transmission in a form having the same slot-based symbol as described above in FIG. 10 or different symbols within (or between slots) as described above in FIGS. 13 to 14 Repetitive transmission may be supported in a form having a and a corresponding function may be selected by an upper signal or an L1 signal.

In FIG. 14, it is assumed that PDSCHs repeatedly transmitted by a single DCI or multiple DCIs are TDD or FDD composed of all downlink symbols in one slot, and a single DCI embodiment (14-00) or multiple DCI embodiments (14-20). As shown. However, when there is an uplink symbol or a flexible symbol link in TDD, the UE may have to perform repeated PDSCH transmission other than 14-00 or 14-20. Accordingly, the following describes the repeated PDSCH transmission/reception operation by dividing the TDD configuration into a situation in which the upper signal is set by step 1 or step 2 as described above in FIG. 9 and a situation indicated by terminal common signaling by step 3. Step 1, Step 2, Step 3, and Step 4 described below follow the concept defined in FIG. 9. The terminal performs at least one of the following operations. In addition, the terminal may sufficiently perform a combination of all or some of the above operations. The PDSCH repetitive transmission described below is scheduled according to DCI format 1_x, and the corresponding repetition transmission means repetitive transmission of a slot period or sub-slot period within a slot. The sub-slot size may be previously set as an upper signal or may be determined as an L1 signal (eg, an L value based on a SLIV value in a time resource allocation field of the DCI field).

-Operation 1: For both situations in which the configuration of step 3 is received or not, the terminal does not expect that the symbols scheduled for repetitive PDSCH transmission are indicated in the uplink by step 1 or step 2.

-Operation 2: For both situations in which the configuration of step 3 is received or not, the UE indicates uplink by step 1 or step 2 for symbols in which the first PDSCH is transmitted among symbols scheduled for repetitive PDSCH transmission. If at least one symbol for the symbols in which the PDSCHs other than the first PDSCH are transmitted is indicated as uplink by step 1 or step 2, without expecting that, the terminal may refer to the remaining symbols other than the symbol indicated by the uplink. The PDSCH is received. For example, if one of the remaining PDSCHs is scheduled in symbols #5 to #8 in one slot, and among them, symbol #8 is set as an uplink symbol by step 1 or step 2, the terminal is a symbol #5 to PDSCH is received at #7. At this time, the data transmitted to the PDSCH is rate matched with respect to symbols #5 to #7 and transmitted from the base station to the terminal, or after the data transmitted to the PDSCH with respect to symbols #5 to #8 is rate matched, with respect to symbol #8 Puncturing is performed, and actual PDSCH transmission/reception is performed for symbols #5 to #7. At this time, when the actual effective code rate of the repeatedly transmitted PDSCH exceeds 0.95 or 0.932, the corresponding PDSCH transmission and reception is not performed, and the UE does not receive the corresponding PDSCH.

-Operation 3: For all situations in which the configuration of step 3 is received or not, the UE indicates uplink by step 1 or step 2 for symbols in which the first PDSCH is transmitted among symbols scheduled for repeated PDSCH transmission. If at least one symbol is indicated as uplink by step 1 or step 2 for symbols in which PDSCHs other than the first PDSCH are transmitted, the UE does not perform reception of the corresponding PDSCH. That is, the base station does not transmit the corresponding PDSCH. For example, when a total of 3 PDSCHs are repeatedly transmitted, and these are in order as PDSCH 1, PDSCH 2, and PDSCH 3, the UE expects that symbols scheduled as PDSCH 1 are indicated as uplink by step 1 or step 2. I never do that. On the other hand, symbols scheduled for PDSCH 2 or PDSCH 3 may be indicated as uplink symbols by step 1 or step 2, but if one of the symbols of PDSCH 2 is an uplink symbol by step 1 or step 2 When indicated as, the terminal does not expect to receive a PDSCH. If all of the symbols of PDSCH 3 are not indicated as uplink symbols by step 1 or step 2, the terminal receives the PDSCH.

-Operation 4: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the terminal does not expect that the symbols scheduled for repetitive PDSCH transmission are indicated as uplink symbols by step 3.

-Operation 5: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the terminal indicates symbols allocated as the first PDSCH among the PDSCHs repeatedly transmitted and received by the PDSCH as uplink symbols by step 3 If at least one symbol is indicated as uplink (or flexible symbol) by step 3 for symbols to which PDSCHs other than the first PDSCH are allocated, the terminal is indicated as uplink (or flexible link). PDSCH is received for the remaining symbols except for the symbol. For example, if one of the remaining PDSCHs is scheduled in symbols #5 to #8 in one slot, and among them, symbol #8 is set to uplink (or flexible symbol) by step 3, the terminal is assigned to symbol #5 The PDSCH is received at ~#7. At this time, the data transmitted to the PDSCH is rate matched with respect to symbols #5 to #7 and transmitted from the base station to the terminal, or after the data transmitted to the PDSCH with respect to symbols #5 to #8 is rate matched, with respect to symbol #8 Puncturing is performed, and actual PDSCH transmission/reception is performed for symbols #5 to #7. At this time, when the actual effective code rate of the repeatedly transmitted PDSCH exceeds 0.95 or 0.932, the corresponding PDSCH transmission and reception is not performed, and the UE does not receive the corresponding PDSCH.

-Operation 6: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the terminal indicates the symbols allocated as the first PDSCH among the PDSCHs repeatedly transmitted and received by the PDSCH as uplink symbols by step 3 If at least one symbol is indicated as uplinks by step 3 for symbols to which PDSCHs other than the first PDSCH are allocated, the UE PDSCH for the remaining symbols other than the uplink symbol Receive. For example, if one of the remaining PDSCHs is scheduled in symbols #5 to #8 in one slot, and among them, if symbol #8 is set to uplink by step 3, the terminal is in the symbol #5 to #7. Receive PDSCH. At this time, the data transmitted to the PDSCH is rate matched with respect to symbols #5 to #7 and transmitted from the base station to the terminal, or after the data transmitted to the PDSCH with respect to symbols #5 to #8 is rate matched, with respect to symbol #8 Puncturing is performed, and actual PDSCH transmission/reception is performed for symbols #5 to #7. At this time, when the actual effective code rate of the repeatedly transmitted PDSCH exceeds 0.95 or 0.932, the corresponding PDSCH transmission and reception is not performed, and the UE does not receive the corresponding PDSCH.

-Operation 7: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the terminal indicates the symbols allocated as the first PDSCH among the PDSCHs repeatedly transmitted and received by the PDSCH as uplink symbols by step 3 If at least one symbol is indicated as an uplink symbol (or flexible symbol) by step 3 for symbols to which PDSCHs other than the first PDSCH are allocated, the UE does not perform reception of the corresponding PDSCH. . That is, the base station does not transmit the corresponding PDSCH. As an example, when a total of three PDSCHs are repeatedly transmitted, and these are referred to as PDSCH 1, PDSCH 2, and PDSCH 3 in order, the UE does not expect that symbols scheduled as PDSCH 1 are indicated as uplink by step 3. On the other hand, symbols scheduled for PDSCH 2 or PDSCH 3 may be indicated as uplink symbols (or flexible symbols) by step 3, but if one of the symbols of PDSCH 2 is an uplink symbol ( Or flexible symbol), the UE does not expect to receive a PDSCH. If all of the symbols of PDSCH 3 are not indicated as uplink symbols (or flexible symbols) by step 3, the terminal receives the PDSCH.

-Operation 8: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the terminal indicates symbols allocated as the first PDSCH among the PDSCHs repeatedly transmitted and received by the PDSCH as uplink symbols by step 3 If at least one symbol is indicated as uplink symbols by step 3 for symbols to which PDSCHs other than the first PDSCH are allocated, the UE does not receive the corresponding PDSCH. That is, the base station does not transmit the corresponding PDSCH. As an example, when a total of 3 PDSCHs are repeatedly transmitted, and these are in order as PDSCH 1, PDSCH 2, and PDSCH 3, the UE does not expect that symbols scheduled as PDSCH 1 are indicated as uplink by step 3 . On the other hand, symbols scheduled for PDSCH 2 or PDSCH 3 may be indicated as uplink symbols by step 3, but if one of the symbols of PDSCH 2 is indicated by step 3 as an uplink symbol, the terminal Does not expect to receive a PDSCH. When all of the symbols of PDSCH 3 are not indicated as uplink symbols by step 3, the terminal receives the PDSCH.

-Operation 9: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the terminal indicates symbols allocated as the first PDSCH among the PDSCHs repeatedly transmitted and received by the PDSCH as uplink symbols by step 3 If at least one symbol is indicated as uplink symbols by step 3 for symbols to which PDSCHs other than the first PDSCH are allocated, the UE does not transmit the PDSCH for the corresponding symbols, and the uplink After the link symbol, the PDSCH is transmitted for downlink (or flexible) symbols capable of transmitting the PDSCH. As an example, in a situation in which a total of two PDSCHs in one slot are sequentially scheduled for transmission and reception of PDSCH 1 and PDSCH 2 having the same length, symbols allocated to PDSCH 1 are indicated as downlink symbols by step 3, and PDSCH When some of the symbols allocated to 2 are indicated as an uplink symbol (or flexible) symbol by step 3, the UE has the same slot after PDSCH 2 is the uplink symbol (or flexible) symbol indicated by step 3 It is determined that PDSCH 2 is transmitted and received in a downlink symbol to which all of the PDSCH 2 can be allocated. That is, the UE considers that the time resource region in which PDSCH 2 is transmitted/received is delayed. A delay of PDSCH 2 is allowed within the slot. If there are no downlink symbols to which all PDSCH 2 can be allocated, the UE considers that the transmission and reception of PDSCH 2 is omitted. As another example, when PDSCH 2 is delayed in a situation in which a total of three PDSCHs of PDSCH 1, PDSCH 2, and PDSCH 3 are scheduled for repeated transmission and reception in one slot, PDSCH 3 is also delayed and transmitted and received after PDSCH 2.

-Operation 10: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the terminal indicates symbols allocated as the first PDSCH among the PDSCHs repeatedly transmitted and received by the PDSCH as uplink symbols by step 3 If at least one symbol is indicated as uplink symbols by step 3 for symbols to which PDSCHs other than the first PDSCH are allocated, the UE does not transmit the PDSCH for the corresponding symbols, and the uplink After the link symbol, the PDSCH is transmitted for downlink symbols capable of transmitting the PDSCH. For example, in a situation in which a total of two PDSCHs in one slot are sequentially scheduled for transmission and reception of PDSCH 1 and PDSCH 2 having the same length, symbols allocated to PDSCH 1 are downlink symbols (or flexible symbols) by step 3 When some of the symbols indicated by and allocated to PDSCH 2 are indicated as uplink symbols by step 3, the UE has PDSCH 2 and PDSCH 2 is all in the same slot after the uplink symbol indicated by step 3 It is determined that it is transmitted/received in a downlink symbol (or flexible symbol) that can be allocated. That is, the UE considers that the time resource region in which PDSCH 2 is transmitted/received is delayed. A delay of PDSCH 2 is allowed within the slot. If there are no downlink symbols (or flexible symbols) to which all PDSCH 2 can be allocated, the UE considers that the transmission and reception of PDSCH 2 is omitted. As another example, when PDSCH 2 is delayed in a situation in which a total of three PDSCHs of PDSCH 1, PDSCH 2, and PDSCH 3 are scheduled for repeated transmission and reception in one slot, PDSCH 3 is also delayed and transmitted and received after PDSCH 2.

-Operation 11: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the UE is scheduled for repeated PDSCH transmission, and at least one of the symbols to which each PDSCH is allocated for the repeatedly transmitted PDSCHs When a is indicated as an uplink symbol (or flexible symbol) by step 3, the UE considers that the transmission and reception of the corresponding PDSCH is omitted. For example, in a situation in which PDSCH 1 and PDSCH 2 are scheduled for repeated transmission, when at least one of the symbols allocated to PDSCH 1 is indicated as uplink (or flexible symbol) by step 3, the UE transmits and receives PDSCH 1 Without performing, only PDSCH 2 is received.

-Operation 12: When receiving the setting of step 3 and correctly receiving the corresponding signaling (DCI format 2_0), the UE is scheduled for repeated PDSCH transmission, and at least one of the symbols to which each PDSCH is allocated for the repeatedly transmitted PDSCHs When a is indicated as an uplink symbol by step 3, the UE considers that the transmission and reception of the corresponding PDSCH is omitted. For example, in a situation in which PDSCH 1 and PDSCH 2 are scheduled for repetitive transmission, when at least one of the symbols allocated to PDSCH 1 is indicated as uplink by step 3, the UE does not perform transmission/reception of PDSCH 1, and the PDSCH It receives only 2.

-Operation 13: After receiving the setting in step 3, the corresponding signaling (DCI format 2_0) is not received correctly, or the corresponding signaling (DCI format 2_0) is received, but the PUSCH preparation time T immediately after the symbol in which the corresponding signaling (DCI format 2_0) is transmitted/received. _{If it is within proc,2} , the terminal does not know the slot information indicated in the corresponding signaling. Specifically, since the downlink symbol information or the uplink symbol information in the slot indicated in step 1 or step 2 cannot be re-changed by step 3, the above information can be determined by the terminal even if the terminal does not know the step 3 information. When a set of specific symbols in a slot is determined as a flexible symbol by step 1 or step 2, the UE does not know whether the corresponding symbol is indicated by step 3 as an uplink symbol or a downlink symbol or a flexible symbol without knowing step 3 information. Accordingly, if at least one of the symbols scheduled for repeated PDSCH transmission is determined as an uplink symbol (or flexible symbol) by step 1 or step 2, the UE skips all PDSCH repeated reception. Alternatively, when at least one of the symbols scheduled for repeated PDSCH transmission is determined as an uplink symbol (or flexible symbol) by step 1 or step 2, the UE skips only the corresponding PDSCH reception. That is, if all of the symbols to which some of the PDSCHs are allocated among the repeatedly transmitted PDSCHs are set as downlink symbols by step 1 or step 2, the corresponding PDSCH is received by the terminal. Alternatively, the UE determines that all PDSCH repetitive transmission scheduling information is valid and receives all PDSCHs. Alternatively, among the PDSCH repetitive transmission scheduling information, the terminal receives only the first PDSCH transmission regardless of the symbol information set in step 1 or step 2, and the other PDSCH transmission/reception is omitted by the terminal.

-Operation 14: After receiving the setting of step 3, the corresponding signaling (DCI format 2_0) was not received correctly, or the corresponding signaling (DCI format 2_0) was received, but the PUSCH preparation time T immediately after the symbol for which the corresponding signaling (DCI format 2_0) was transmitted/received. _{If it is within proc,2} , the UE does not expect that the symbols to which the first PDSCH is allocated for scheduled PDSCH repetition transmission/reception is indicated as an uplink symbol or a flexible symbol by step 1 or step 2, or at step 1 or step 2 The first PDSCH is received even if indicated by a flexible symbol. If at least one is indicated as an uplink symbol or a flexible symbol by step 1 or step 2 for symbols to which PDSCHs are allocated after the first PDSCH is excluded for scheduled PDSCH repetition transmission and reception, the UE receives the corresponding PDSCH. Do not perform. For example, in a situation in which three PDSCHs are repeatedly transmitted/received, one of the symbols to which the second PDSCH is allocated is indicated as a flexible symbol by step 1 or step 2, and the remaining symbols to which the first PDSCH and the third PDSCH are allocated are all When indicated by a downlink symbol, the UE performs reception of the first PDSCH and the third PDSCH excluding the second PDSCH.

Although the above operation has been described only for PDSCHs scheduled by DCI, it can be sufficiently applied to SPS PDSCHs that are transmitted/received without scheduling by a separate DCI. In addition, since the first SPS PDSCH transmitted/received among the SPS PDSCHs is scheduled by DCI, this SPS PDSCH is regarded as a PDSCH scheduled by DCI.

17 is a diagram illustrating a data transmission method according to an embodiment of the present disclosure.

When the UE is scheduled for a PDSCH by one DCI, the time resource allocation information field value m included in the corresponding DCI may provide an m+1 index column of the corresponding time resource allocation information table. The time resource allocation table can be configured as shown in [Table 17] below.

[Table 17]

In the above [Table 17], dmrs-TypeA-Position is information indicating whether the position of the DMRS is located at the 2nd or 3rd in the slot when having the pattern of the DMRS of PDSCH mapping type A, and can be set as an upper signal. have. The dmrs-TypeA-Position value may not be applied to PDSCH mapping type B. The PDSCH mapping type may be a field indicating the location information of the DMRS present in the PDSCH, and if it is Type A, the DMRS may exist at a fixed symbol location in the slot regardless of the start time and length at which the PDSCH is scheduled, and if it is Type B , DMRS may exist in the start symbol in which the PDSCH is scheduled. K ₀ denotes offset information between a slot in which a PDCCH exists and a slot in which a PDSCH scheduled by the PDCCH exists, S denotes a start symbol of the PDSCH, L denotes the length of the PDSCH, and Repetition denotes the number of times the PDSCH is repeatedly transmitted. Repetition information may not exist.

Therefore, the time resource allocation field value m of the DCI is determined by the slot offset corresponding to the m+1 index of the time resource allocation table, SLIV (or individual information of S and L) composed of a combination of S and L, and PDSCH mapping type. The UE may recognize and receive time resource allocation information and DMRS location information of the scheduled PDSCH.

,이며, 여기서 n은 스케줄링 DCI가 송수신된 슬롯일 수 있다. K0는 PDSCH의 부반송파 간격 정보를 기반으로 결정된 값이며, μ_PDSCH와μ_PDCCH는 각각 PDSCH와 PDCCH의 부반송파 간격 설정 정보들을 의미한다. 도 17에서 이에 대한 일례를 보여준다. 17-1 (또는 17-11)에서 슬롯 n에서 단말은 PDCCH(17-3 또는 17-13)를 수신하고, 해당 PDCCH가 스케줄링한 PDSCH(17-5 또는 17-15)는 슬롯 k에서 송수신된다. 여기서 슬롯 k는

이다. PDCCH와 PDSCH의 부반송파 간격이 다른 상황은 PDCCH와 PDSCH가 송수신되는 셀 또는 캐리어가 다르고 셀 또는 캐리어에 설정된 부반송파 간격이 다를 경우 또는 PDCCH와 PDSCH가 같은 셀 또는 캐리어에 존재하지만, 각기 다른 BWP(주파수 대역폭 부분)이 다르고, 각각의 BWP는 서로 다른 부반송파 간격이 설정된 경우를 포함할 수 있다. μ_PDSCH와 μ_PDCCH의 값은 15kHz일 경우 0이고, 30kHz일 경우 1이고, 60kHz일 경우 2이고, 120kHz일 경우 3이다.According to an embodiment of the present disclosure, information on a slot to which a PDSCH is allocated is

, Where n may be a slot in which scheduling DCI is transmitted/received. K0 is a value determined based on subcarrier spacing information of the _PDSCH, and μ _{PDSCH and μ PDCCH} denote subcarrier spacing information of PDSCH and PDCCH, respectively. Fig. 17 shows an example of this. In 17-1 (or 17-11), in slot n, the terminal receives the PDCCH (17-3 or 17-13), and the PDSCH (17-5 or 17-15) scheduled by the corresponding PDCCH is transmitted and received in slot k. . Where slot k is

to be. The situation where the subcarrier spacing of the PDCCH and the PDSCH is different is when the cell or carrier through which the PDCCH and the PDSCH are transmitted and received is different and the subcarrier spacing set for the cell or carrier is different, or the PDCCH and the PDSCH are in the same cell or carrier, but different BWP (frequency bandwidth Parts) are different, and each BWP may include a case in which a different subcarrier spacing is set. The values of μ _PDSCH and μ _PDCCH are 0 for 15 kHz, 1 for 30 kHz, 2 for 60 kHz, and 3 for 120 kHz.

The start symbol S can be determined by the following two methods.

-Method 17-1: The UE receives a higher signal indicating reference point change information of the start symbol S to which the PDSCH is allocated, and the PDSCH mapping type B and K ₀ are C-RNTI, MCS-RNTI, When receiving the PDSCH scheduled according to the DCI format including the CRC scrambled with CS-RNTI, the start symbol S may be determined based on _{the first symbol S 0 of the PDCCH monitoring time (or PDCCH resource or CORESET) at which the DCI format is detected.} have.

When the subcarrier spacing of the PDCCH and the PDSCH and the cyclic prefix are the same, the above-described Method 1 may be applied. According to an embodiment of the present disclosure, when the subcarrier spacing or cyclic prefix of the PDCCH and the PDSCH are different, at least one of the following detailed methods may be applied as in Method 17-1. That is, it may be applied together with Method 17-1 by some or all combinations of the following detailed methods.

-Method 17-1-1: The UE considers (or determines) the first symbol among the symbols of the PDSCH overlapping all or part of the first symbol of the PDCCH in which the DCI format scheduling the PDSCH is detected as S _0.

-Method 17-1-2: The UE regards (or determines) the last symbol among the symbols of the PDSCH overlapping all or part of the first symbol of the PDCCH in which the DCI format scheduling the PDSCH is detected as S _0.

The above methods are not limited to cases where the subcarrier spacing or cyclic prefix of the PDCCH and the PDSCH are different, and may be commonly applied in a general situation.

-Method 17-2: In all cases other than the situations described in Method 17-1, the UE may determine the start symbol S based on the first symbol S ₀ (S ₀ = 0) of the slot in which the PDSCH is scheduled.

According to an embodiment of the present disclosure, method 17-1 may be applied only when the subcarrier spacing or cyclic prefix of the PDCCH and the PDSCH are the same. Alternatively, method 17-1 may not be applied in a situation in which the PDCCH and PDSCH are cross-carrier scheduling. That is, the terminal applies Method 17-2.

As another example, method 17-1 may be applied only when the subcarrier spacing value μ _PDCCH of the PDCCH is equal to or greater than the subcarrier spacing value μ _{PDSCH of the PDSCH.}

In another example, if a subcarrier spacing values of PDCCH μ _PDCCH is less than the subcarrier spacing values of PDSCH μ _PDSCH, when the start the PDCCH is transmitted symbols do not belong to the slot indicated by k ₀ (or, indicated by k ₀ Earlier than the first symbol of the slot), Method 17-1 may not be applied. That is, the method 17-2 can be applied by the terminal.

The length L refers to consecutive L symbols to which the PDSCH is allocated from the start symbol, and may be determined from the SLIV value by the following [Equation 17-1].

[Equation 17-1]

In the case of a normal cyclic prefix, the _{UE determines that only values of S and L satisfying S 0} +S + L ≤ 14 are valid PDSCH time resource allocation information. In the case of the extended cyclic prefix, the _{terminal may determine that only values of S and L satisfying S 0} +S + L ≤ 12 are valid PDSCH time resource allocation information. In the case of a combination of S and L not satisfying the above-described condition, the UE may determine that the DCI information is incorrectly determined and may regard (or determine) as an error case.

, 이며, 여기서 n은 스케줄링 DCI가 송수신된 슬롯일 수 있다. K0는 PDSCH의 부반송파 간격 정보를 기반으로 결정된 값이며, μ_PDSCH와μ_PDCCH는 각각 PDSCH와 PDCCH의 부반송파 간격 설정 정보들을 의미한다. 도 17에서 이에 대한 일례를 보여준다. 17-1 (또는 17-11)에서 슬롯 n에서 단말은 PDCCH(17-3 또는 17-13)를 수신하고, 해당 PDCCH가 스케줄링한 PDSCH(17-5 또는 17-15)는 슬롯 k에서 송수신된다. 여기서 슬롯 k는

이다. PDCCH와 PDSCH의 부반송파 간격이 다른 상황은 PDCCH와 PDSCH가 송수신되는 셀 또는 캐리어가 다르고 셀 또는 캐리어에 설정된 부반송파 간격이 다를 경우 또는 PDCCH와 PDSCH가 같은 셀 또는 캐리어에 존재하지만, 각기 다른 BWP(주파수 대역폭 구간)이 다르고, 각각의 BWP는 서로 다른 부반송파 간격이 설정된 경우를 포함할 수 있다. μ_PDSCH와μ_PDCCH의 값은 15kHz일 경우 0이고, 30kHz일 경우 1이고, 60kHz일 경우 2이고, 120kHz일 경우 3이다.According to an embodiment of the present disclosure, information on a slot to which a PDSCH is allocated is

, Where n may be a slot in which scheduling DCI is transmitted/received. K0 is a value determined based on subcarrier spacing information of the _PDSCH, and μ _{PDSCH and μ PDCCH} denote subcarrier spacing information of PDSCH and PDCCH, respectively. Fig. 17 shows an example of this. In 17-1 (or 17-11), in slot n, the terminal receives the PDCCH (17-3 or 17-13), and the PDSCH (17-5 or 17-15) scheduled by the corresponding PDCCH is transmitted and received in slot k. . Where slot k is

to be. The situation where the subcarrier spacing of the PDCCH and the PDSCH is different is when the cell or carrier through which the PDCCH and the PDSCH are transmitted and received is different and the subcarrier spacing set for the cell or carrier is different, or the PDCCH and the PDSCH are in the same cell or carrier, but different BWP (frequency bandwidth Sections) are different, and each BWP may include a case in which a different subcarrier spacing is set. The values of μ _PDSCH and μ _PDCCH are 0 for 15 kHz, 1 for 30 kHz, 2 for 60 kHz, and 3 for 120 kHz.

The start symbol S can be determined by the following two methods.

은 슬롯 내의 심볼 수로써 보통 순환 전치는 14이고, 확장 순환 전치는 12이다. -Method 17-3: The UE receives a higher signal indicating reference point change information of the start symbol S to which the PDSCH is allocated, and the PDSCH mapping type B and K ₀ are C-RNTI, MCS-RNTI, When receiving the PDSCH scheduled by the DCI format including the CRC scrambled with CS-RNTI, the start symbol S is determined based on _{the first symbol S 0 of the PDCCH monitoring time (or PDCCH resource or CORESET) at which the DCI format is detected.} . Specifically, S ₂ refers to the first symbol of the PDCCH monitoring time (or CORESET) in the slot (or cell or BWP) in which the PDCCH _{is scheduled, and S 1} refers to the symbol index value of the slot (or cell or BWP) in which the PDSCH is scheduled. It can mean. The relationship between S ₂ and S ₁ can be determined by the following [Equation 17-2].

Is the number of symbols in the slot, and the normal cyclic prefix is 14 and the extended cyclic prefix is 12.

[Equation 17-2]

Alternatively, it may be possible for the following [Equation 17-3] to be applied.

[Equation 17-3]

또는

은 서로 바뀌어서 적용될 수 있다. 또한, ≤ 와 < 는 서로 변경되어 [수식 17-2] 또는 [수식 17-3]에 적용할 수 있다. 또한, ≥와 >는 서로 변경되어 [수식 17-2] 또는 [수식 17-3]에 적용할 수 있다.If μ _PDSCH ≥ _{μ PDCCH} and S ₂ <A ⁱ , the UE does not expect method 14A-3 to be applied. That is, it is determined that Method 17-4 is applied. In [Equation 17-2] or [Equation 17-3] described above

or

Can be applied interchangeably. In addition, ≤ and <can be changed to each other and applied to [Equation 17-2] or [Equation 17-3]. In addition, ≥ and> can be changed to each other and applied to [Equation 17-2] or [Equation 17-3].

-Method 17-4: In all cases other than the situations described in Method 17-3, the UE may determine the start symbol S based on the first symbol S ₁ (S ₁ = 0) of the slot in which the PDSCH is scheduled.

According to an embodiment of the present disclosure, method 17-3 may be applied only when the subcarrier spacing or cyclic prefix of the PDCCH and the PDSCH are the same. Alternatively, method 17-3 may not be applied in a situation in which the PDCCH and PDSCH are cross-carrier scheduling. That is, method 17-4 can be applied by the terminal.

As another example, method 14A-3 may be applied only when the subcarrier spacing value μ _PDCCH of the PDCCH is equal to or greater than the subcarrier spacing value μ _{PDSCH of the PDSCH.}

In another example, if a subcarrier spacing values of PDCCH μ _PDCCH is less than the subcarrier spacing values of PDSCH μ _PDSCH, when the start the PDCCH is transmitted symbols do not belong to the slot indicated by k ₀ (or, indicated by k ₀ Earlier than the first symbol of the slot), Method 17-3 may not be applied. That is, the terminal applies Method 17-4.

The length L means consecutive L symbols to which the PDSCH is allocated from the start symbol, and is determined from the SLIV value by the following [Equation 17-5].

[Equation 17-5]

In the case of a normal cyclic prefix, the _{UE determines that only values of S and L satisfying S 1} +S + L ≤ 14 are valid PDSCH time resource allocation information. In the case of the extended cyclic prefix, the _{UE determines that only values of S and L satisfying S 1} +S + L ≤ 12 are valid PDSCH time resource allocation information. In the case of a combination of S and L not satisfying the above-described condition, the UE may determine that the DCI information is incorrectly determined and may regard it as an error case.

Subsequently, in FIG. 18, methods 17-1 and 17-2 are applied in a cross-carrier scheduling situation including the contents described above in FIG. 17.

18 is a diagram illustrating a method of applying cross-carrier scheduling according to an embodiment of the present disclosure.

In cross-carrier scheduling, a cell 18-00 through which control information is transmitted and received may be different from a cell 18-06 through which data is transmitted and received. For example, a cell 18-00 in which control information is transmitted/received is called a scheduling cell or a primary cell, and a cell through which data information is transmitted/received by control information is a scheduled cell, It is called a secondary cell. In addition, one or a plurality of bandwidth portions 18-02 and 18-04 may exist in the cell 18-00 through which control information is transmitted and received, and one or more in the cell 18-06 through which data information is transmitted/received. There may be multiple bandwidth portions 18-08 and 18-10.

The methods 17-1 and 17-2 described above in FIG. 17 can be applied as follows in FIG. 18. If, in the scheduling cell 18-00, the bandwidth portion 18-02 in which control information is transmitted/received and the bandwidth portion that can be scheduled by the control information in the scheduled cell 18-06 are 18-08 and 18-10. Can be For example, a cross-carrier scheduling operation may be possible through an indicator (carrier indicator) indicating a cross-carrier in a control information field and a field (BWP indicator) indicating a bandwidth. Alternatively, it may be possible to activate a specific bandwidth portion in cells 18-06 by another upper signal or an L1 signal in advance. 18-02 and 18-08 may be previously set as an upper signal so that the subcarrier spacing is the same, and 18-02 and 18-10 may be previously set as an upper signal so that the subcarrier spacing is different.

When the data information scheduled by the control information is transmitted/received (18-12) in the bandwidth portion 18-08, the terminal may determine that method 17-1 has been applied, and the data information scheduled by the control information is 18-10. When transmission/reception (18-14) is performed in the bandwidth portion, it may be determined that the method 17-2 is applied.

For example, when the subcarrier spacing of the 18-02 and 18-08 bandwidth portions is 15 kHz, and the subcarrier spacing of 18-04 and 18-10 is 30 kHz, cross-carrier scheduling from the 18-02 bandwidth portion to the 18-08 bandwidth portion In the case of (18-12) and when cross-carrier scheduling (18-18) is performed from the 18-04 bandwidth portion to the 18-10 bandwidth portion, the terminal determines that the above-described method 17-1 is applied, and 18-02 In the case of cross-carrier scheduling (18-14) in the bandwidth part 18-10 in the bandwidth part, and when cross-carrier scheduling (18-16) in the 18-08 bandwidth part in the 18-04 bandwidth part, the terminal uses method 17- It can be determined that 2 has been applied.

In FIG. 18, even if a plurality of bandwidth portions are set by an upper signal in one cell, only one (or a plurality of) bandwidth portions are activated, and the terminal transmits and receives control information or data information with the base station only through the activated bandwidth portion. I can.

In addition, according to an embodiment of the present disclosure, a method of applying Method 17-1 or Method 17-2 according to whether subcarrier intervals of a bandwidth portion in which control information and data information are transmitted/received are the same in a cross-carrier scheduling situation has been described. In the same manner, it is possible to apply either Method 17-1 or Method 17-2 depending on whether the cyclic prefixes are the same, and it is sufficiently possible to apply it in consideration of whether both the cyclic prefixes and the subcarrier spacing are the same.

Alternatively, the UE may receive data information from the base station irrespective of cross-carrier scheduling through the following methods 18-1 and 18-2 other than the methods 17-1 and 17-2.

이며, 여기서 n은 스케줄링 DCI가 송수신된 슬롯일 수 있다. K₀는 PDSCH의 부반송파 간격 정보를 기반으로 결정된 값이며, μ_PDSCH와μ_PDCCH는 각각 PDSCH와 PDCCH의 부반송파 간격 설정 정보들을 의미할 수 있다. 여기서 슬롯 k는

이다. PDCCH와 PDSCH의 부반송파 간격이 다른 상황은 PDCCH와 PDSCH가 송수신되는 셀 또는 캐리어가 다르고 셀 또는 캐리어에 설정된 부반송파 간격이 다를 경우 또는 PDCCH와 PDSCH가 같은 셀 또는 캐리어에 존재하지만, 각기 다른 BWP(주파수 대역폭 부분)이 다르고, 각각의 BWP는 서로 다른 부반송파 간격이 설정된 경우를 포함할 수 있다. μ_PDSCH와 μ_PDCCH의 값은 15kHz일 경우 0이고, 30kHz일 경우 1이고, 60kHz일 경우 2이고, 120kHz일 경우 3이다.Information on the slot to which the PDSCH is allocated is

Where n may be a slot in which scheduling DCI is transmitted/received. K ₀ is a value determined based on subcarrier spacing information of the _PDSCH, and μ _{PDSCH and μ PDCCH} may mean subcarrier spacing configuration information of PDSCH and PDCCH, respectively. Where slot k is

to be. The situation where the subcarrier spacing of the PDCCH and the PDSCH is different is when the cell or carrier through which the PDCCH and the PDSCH are transmitted and received is different and the subcarrier spacing set for the cell or carrier is different, or the PDCCH and the PDSCH are in the same cell or carrier, but different BWP (frequency bandwidth Parts) are different, and each BWP may include a case in which a different subcarrier spacing is set. The values of μ _PDSCH and μ _PDCCH are 0 for 15 kHz, 1 for 30 kHz, 2 for 60 kHz, and 3 for 120 kHz.

The start symbol S can be determined by the following two methods.

-Method 18-1: C-RNTI, MCS-RNTI, CS having PDSCH mapping type B and K0 values of 0 when the UE receives a higher signal indicating reference point change information of the start symbol S allocated with the PDSCH -When receiving a PDSCH scheduled according to the DCI format including the CRC scrambled with RNTI, if the subcarrier spacing (or cyclic prefix) of the PDCCH and the PDSCH is the same, the PDCCH monitoring time (or It may be determined based on the first symbol S0 of PDCCH resource or CORESET).

-Method 18-2: In all cases other than the situations described in Method 18-1, the UE may determine the start symbol S based on the first symbol S ₀ (S ₀ = 0) of the slot in which the PDSCH is scheduled.

15 is a diagram illustrating a terminal structure in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 15, the terminal may include a transceiver 15-00, a memory 15-05, and a processor 15-10. According to the above-described communication method of the terminal, the transmission/reception unit 15-00 and the processor 15-10 of the terminal may operate. However, the components of the terminal are not limited to the above-described example. For example, the terminal may include more or fewer components than the above-described components. In addition, the transmission/reception unit 15-00, the memory 15-05, and the processor 15-10 may be implemented in the form of a single chip.

The transceiving unit 15-00 may transmit and receive signals to and from the base station. Here, the signal may include control information and data. To this end, the transmission/reception unit 15-00 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. However, this is only an embodiment of the transmission/reception unit 15-00, and components of the transmission/reception unit 15-00 are not limited to the RF transmitter and the RF receiver.

In addition, the transmission/reception unit 15-00 may receive a signal through a wireless channel, output it to the processor 15-10, and transmit a signal output from the processor 15-10 through the wireless channel.

The memory 15-05 may store programs and data necessary for the operation of the terminal. In addition, the memory 15-05 may store control information or data included in signals transmitted and received by the terminal. The memories 15-05 may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Also, there may be a plurality of memories 15-05.

In addition, the processor 15-10 may control a series of processes so that the terminal can operate according to the above-described embodiment. For example, the processor 15-10 may control a component of the terminal to receive a DCI composed of two layers and simultaneously receive a plurality of PDSCHs. There may be a plurality of processors 15-10, and the processor 15-10 may perform a component control operation of the terminal by executing a program stored in the memory 15-05.

16 is a diagram illustrating a structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

Referring to FIG. 16, a base station may include a transceiver 16-00, a memory 16-05, and a processor 16-10. According to the above-described communication method of the base station, the transmission/reception unit 16-00 and the processor 16-10 of the base station may operate. However, the components of the base station are not limited to the above-described example. For example, the base station may include more or fewer components than the above-described components. In addition, the transceiver unit 16-00, the memory 16-05, and the processor 16-10 may be implemented in the form of a single chip.

The transceiving unit 16-00 may transmit and receive signals to and from the terminal. Here, the signal may include control information and data. To this end, the transceiver unit 16-00 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. However, this is only an embodiment of the transmission/reception unit 16-00, and components of the transmission/reception unit 16-00 are not limited to the RF transmitter and the RF receiver.

In addition, the transmission/reception unit 16-00 may receive a signal through a wireless channel, output it to the processor 16-10, and transmit a signal output from the processor 16-10 through a wireless channel.

The memories 16-05 may store programs and data necessary for the operation of the base station. In addition, the memory 16-05 may store control information or data included in signals transmitted and received by the base station. The memories 16-05 may be composed of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. Also, there may be a plurality of memories 16-05.

The processor 16-10 may control a series of processes so that the base station can operate according to the above-described embodiment of the present disclosure. For example, the processor 16-10 may control each component of the base station to configure and transmit DCIs of two layers including allocation information for a plurality of PDSCHs. There may be a plurality of processors 16-10, and the processor 16-10 may perform a component control operation of the base station by executing a program stored in the memory 16-05.

The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions for causing the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other types of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is accessed through a communication network such as Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination of these. It may be stored in an (access) attachable storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

In the specific embodiments of the present disclosure described above, the constituent elements included in the invention are expressed in the singular or plural according to the presented specific embodiment. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

Meanwhile, the embodiments of the present disclosure disclosed in the present specification and drawings are merely provided with specific examples to easily describe the technical content of the present disclosure and to aid understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those of ordinary skill in the art to which the present disclosure belongs that other modifications are possible based on the technical idea of the present disclosure. In addition, each of the above embodiments may be combined and operated as necessary. For example, parts of one embodiment of the present disclosure and another embodiment may be combined with each other to operate a base station and a terminal. For example, parts of the first and second embodiments of the present disclosure may be combined with each other to operate a base station and a terminal. In addition, although the above embodiments have been presented based on the FDD LTE system, other systems such as the TDD LTE system, 5G or NR system may also be implemented with other modifications based on the technical idea of the embodiment.

Claims (1)

In the communication method of a terminal in a wireless communication system,
Receiving a higher layer signal including repetitive transmission-related setting information;
Receiving downlink control information of at least one of a first transmission and reception point (TRP) and a second TRP;
Receiving a first PDSCH (Physical Downlink Control CHannel) from the first TRP, and receiving a second PDSCH from the second TRP, based on the received at least one downlink control information; And
Including the step of combining the received first PDSCH and the received second PDSCH,
The method of claim 1, wherein the first PDSCH and the second PDSCH include the same TB (Transport Block).

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