Methods and apparatus for transmitting data via wireless communication

Abstract

This disclosure relates to a communication technology and system for combining IoT technology with a 5G communication system that supports higher data transmission rates than 4G systems. This disclosure can be applied to smart services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety-related services, etc.) based on 5G communication technology and IoT-related technologies. A method for a terminal in a wireless communication system according to this disclosure includes the following steps: receiving a control signal; determining, based on the control signal, resources that data can be mapped and then transmitted / received; and receiving data based on the determined resources for the data.

Description

Technical Field

[0001] This disclosure relates to a wireless communication system, and more specifically to a method and apparatus for transmitting / receiving data in the wireless communication system. Background Technology

[0002] To meet the explosive growth in demand for wireless data services and multimedia services since the deployment of 4G communication systems, efforts have been focused on developing an improved 5G or near-5G communication system. Therefore, 5G or near-5G communication systems are also referred to as "super 4G network" communication systems or "post-LTE" systems. 5G communication systems are considered to be implemented in ultra-high frequency (millimeter wave) bands (e.g., the 60GHz band) to increase data rates. To reduce radio wave propagation loss and increase transmission distance in ultra-high frequency bands, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies have been discussed in 5G communication systems. Furthermore, in 5G communication systems, development is underway for system network improvements based on advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), receiver interference cancellation, and more. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM), as well as filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet, a human-centric network in which humans generate and consume information, is now evolving into the Internet of Things (IoT), where distributed entities, such as things, exchange and process information without human intervention. The Internet of Things (IoE) is a product of combining IoT technology and big data processing technology through connections to cloud servers. Because the implementation of IoT requires technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, recent research has focused on sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC). Such IoT environments can provide intelligent Internet technology services, creating new value for human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields through the integration and combination of existing information technology (IT) with various industrial applications, including smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart appliances, and advanced medical services.

[0004] Therefore, various efforts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-type communication (MTC), and machine-to-machine (M2M) communication can be implemented using beamforming, MIMO, and array antennas. Cloud radio access networks (cloud RAN), as an application of the aforementioned big data processing technologies, can also be considered an example of the integration of 5G and IoT technologies.

[0005] As mentioned above, with the development of wireless communication systems, there is a need for a data transmission / reception scheme for network cooperative communication. Summary of the Invention

[0006] Technical issues

[0007] There is a need for a scheme to efficiently perform data transmission / reception related to network cooperative communication. In particular, this disclosure provides a method and apparatus for applying rate matching when transmitting / receiving data.

[0008] Solution

[0009] To address the aforementioned problems, this disclosure provides a method executed by a terminal in a communication system. The method includes: receiving information indicating whether to execute a first scheme for rate matching; receiving first rate matching resource information and second rate matching resource information via higher-layer signaling; and receiving a first physical downlink shared channel (PDSCH) and a second PDSCH, wherein when the first scheme is executed based on the information, the resources indicated by the first rate matching resource information are not used to receive the first PDSCH, and the resources indicated by the second rate matching resource information are not used to receive the second PDSCH.

[0010] Furthermore, this disclosure provides a method performed by a base station of a communication system, the method comprising: transmitting information indicating whether to perform a first scheme for rate matching; transmitting first rate matching resource information and second rate matching resource information via higher-layer signaling; and, if the first scheme is performed based on the information, transmitting a first physical downlink shared channel (PDSCH) in resources that do not include the resources indicated by the first rate matching resource information, and transmitting a second PDSCH in resources that do not include the resources indicated by the second rate matching resource information.

[0011] Furthermore, this disclosure provides a UE in a communication system, the UE including: a transceiver; and a controller configured to: receive information indicating whether to execute a first scheme for rate matching; receive first rate matching resource information and second rate matching resource information via higher-layer signaling; and receive a first physical downlink shared channel (PDSCH) and a second PDSCH, wherein, when executing the first scheme based on the information, the resources indicated by the first rate matching resource information are not used to receive the first PDSCH, and the resources indicated by the second rate matching resource information are not used to receive the second PDSCH.

[0012] Furthermore, this disclosure provides a base station in a communication system, the base station comprising: a transceiver; and a controller configured to: transmit information indicating whether to execute a first scheme for rate matching; transmit first rate matching resource information and second rate matching resource information via higher-layer signaling; and, if the first scheme is executed based on the information, transmit a first physical downlink shared channel (PDSCH) in resources that do not include resources indicated by the first rate matching resource information, and transmit a second PDSCH in resources that do not include resources indicated by the second rate matching resource information.

[0013] Beneficial effects

[0014] According to this disclosure, a base station can provide efficient data transmission to a UE in a wireless communication system. Attached Figure Description

[0015] Figure 1 This is a diagram illustrating the time-frequency domain transmission structure of LTE, LTE-Advanced, NR, or similar wireless communication systems.

[0016] Figure 2 This is a diagram illustrating the frame, subframe, and time slot structure in a 5G system.

[0017] Figure 3 An example of the configuration of the bandwidth portion (BWP) according to some embodiments of a wireless communication system according to an embodiment of the present disclosure is shown.

[0018] Figure 4 This is an illustration showing examples of instructions and changes in bandwidth portions according to some embodiments in a wireless communication system according to embodiments of the present disclosure.

[0019] Figure 5 This is an illustration of an example of a control region in a wireless communication system according to embodiments of the present disclosure, configured with a downlink control channel according to some embodiments.

[0020] Figure 6This is an illustration of an example of PDSCH frequency axis resource allocation according to some embodiments in a wireless communication system according to an embodiment of the present disclosure.

[0021] Figure 7 This is an illustration of an example of physical downlink shared channel (PDSCH) time axis resource allocation in a wireless communication system according to an embodiment of the present disclosure.

[0022] Figure 8 This is an illustration of an example of PDSCH time axis resource allocation based on the subcarrier spacing of the data channel and the control channel in a wireless communication system according to an embodiment of the present disclosure.

[0023] Figure 9 This is an illustration of the application of rate matching resources according to an embodiment of the present disclosure.

[0024] Figure 10 This is an illustration of an example of repetitive transmission (slot aggregation) for each slot according to some embodiments in a wireless communication system according to embodiments of the present disclosure.

[0025] Figure 11 This is an illustration showing an example of antenna port configuration and resource allocation for cooperative communication according to some embodiments of a wireless communication system according to embodiments of the present disclosure.

[0026] Figure 12 This is an illustration of an example of configuring downlink control information for cooperative communication in a wireless communication system according to an embodiment of the present disclosure.

[0027] Figure 13A is an illustration of an example of repeated PDSCH transmission using multiple TRPs.

[0028] Figure 13B is an illustration of another example of repeated PDSCH transmissions using multiple TRPs.

[0029] Figure 13C is an illustration of another example of repeated PDSCH transmissions using multiple TRPs.

[0030] Figure 13D is an illustration of another example of repeated PDSCH transmissions using multiple TRPs.

[0031] Figure 14 This is an illustration of a PDSCH resource mapping method in a wireless communication system according to a first embodiment of the present disclosure during repeated transmissions using multiple TRPs.

[0032] Figure 15 This is a diagram illustrating the operation of a UE performing the first embodiment.

[0033] Figure 16 This is a diagram illustrating the operation of a base station performing the first embodiment.

[0034] Figure 17 This is an illustration of a PDSCH resource mapping method in a wireless communication system according to a second embodiment of the present disclosure during repeated transmissions using multiple TRPs.

[0035] Figure 18 This is a diagram illustrating the operation of a UE performing the second embodiment.

[0036] Figure 19 This is an illustration showing the operation of a base station performing the second embodiment.

[0037] Figure 20 This is a diagram illustrating the structure of a UE in a wireless communication system according to an embodiment of the present disclosure.

[0038] Figure 21 This is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure. Detailed Implementation

[0039] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0040] In describing embodiments of this disclosure, descriptions relating to technical content well-known in the art and not directly related to this disclosure will be omitted. This omission of unnecessary descriptions is to prevent obscuring the main ideas of this disclosure and to more clearly convey them.

[0041] For the same reason, some elements may be exaggerated, omitted, or shown schematically in the accompanying drawings. Furthermore, the size of each element does not perfectly reflect its actual size. In the drawings, identical or corresponding elements have the same reference numerals.

[0042] The advantages and features of this disclosure, and its implementation methods, will become apparent from the embodiments described in detail below with reference to the accompanying drawings. However, this disclosure is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided merely to fully disclose this disclosure and to inform those skilled in the art of its scope, and this disclosure is limited only by the scope of the appended claims. Throughout this specification, the same or similar reference numerals denote the same or similar elements.

[0043] In this document, it should be understood that each box in the flowchart description, and combinations of boxes in the flowchart description, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable storage medium capable of instructing a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article of writing comprising instruction elements for performing the functions specified in one or more flowchart boxes. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus, thereby producing a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowchart boxes.

[0044] Furthermore, each box in the flowchart diagram can represent a module, code segment, or code section, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions described in the boxes may occur out of order. For example, depending on the functionality involved, two boxes shown consecutively may actually execute approximately simultaneously, or these boxes may sometimes execute in reverse order.

[0045] As used herein, "unit" refers to a software or hardware element, such as a field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC), that performs a predetermined function. However, "unit" is not always limited to software or hardware. A "unit" can be configured to be stored in addressable storage media or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, programs, subroutines, program code snippets, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" can be combined into a smaller number of elements or "units," or divided into a larger number of elements or "units." Furthermore, elements and "units" can be implemented as one or more CPUs within a playback device or a secure multimedia card. Additionally, a "unit" in an embodiment may include one or more processors.

[0046] The operating principles of this disclosure will be described in detail below with reference to the accompanying drawings. In the following description of this disclosure, detailed descriptions of known functions or configurations incorporated herein will be omitted where it is determined that the description might unnecessarily obscure the subject matter of this disclosure. The terminology described below is defined in consideration of the functions in this disclosure and may vary depending on the user, the user's intent, or habit. Therefore, the definitions of terms should be determined based on the content throughout the specification. In the following description, a base station is an entity that allocates resources to terminals and may be at least one of gNode B, gNodeB, Node B, base station (BS), radio access unit, base station controller, and nodes on a network. Terminals may include user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. Of course, examples of base stations and terminals are not limited to these.

[0047] The following description of this disclosure relates to techniques for receiving broadcast information from a base station by a terminal in a wireless communication system. This disclosure relates to communication technologies and systems for integrating IoT technologies with 5G communication systems designed to support higher data transmission rates than 4G systems. This disclosure can be applied to smart services based on 5G communication technologies and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail businesses, security and safety-related services, etc.).

[0048] As used in the following description, for convenience, terms referring to broadcast information, control information, communication coverage, state changes (e.g., events), network entities, messages, and device elements are used by way of example. Therefore, this disclosure is not limited to the terms used below, and other terms that refer to the subject matter having equivalent technical meaning may be used.

[0049] In the following description, for ease of description, some terms and names defined in the 3GPP LTE standard will be used. However, this disclosure is not limited to these terms and names and can be applied in the same manner to systems conforming to other standards.

[0050] Wireless communication systems have evolved from providing initial voice-oriented services to broadband wireless communication systems that provide high-speed and high-quality packet data services, such as High-Speed ​​Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA) in 3GPP, LTE-Advanced (LTE-A), LTE-pro, High-Rate Packet Data (HRPD) in 3GPP2, Ultra Mobile Broadband (UMB), and communication standards such as IEEE 802.16e.

[0051] In LTE systems, a representative example of broadband wireless communication systems, Orthogonal Frequency Division Multiplexing (OFDM) is used in the downlink (DL), and Single Carrier Frequency Division Multiple Access (SC-FDMA) is used in the uplink (UL). The uplink refers to the radio link through which a User Equipment (UE) or Mobile Station (MS) transmits data or control signals to a Base Station (BS) (eNodeB or base station), and the downlink refers to the radio link through which the base station transmits data or control signals to the UE. These multiple access methods allow for the allocation and manipulation of time-frequency resources to which each user's data or control information is to be transmitted, ensuring that the data or control information to be distinguished by each user does not overlap, i.e., establishing orthogonality.

[0052] As the communication system following LTE, 5G communication systems must support services that simultaneously meet diverse needs, allowing them to freely reflect the various demands of users and service providers. Services considered for 5G communication systems include enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC).

[0053] According to one embodiment, eMBB is designed to provide improved data transmission rates than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, from the perspective of a base station, eMBB should be able to provide a peak data rate of 20Gbps in the downlink and 10Gbps in the uplink. Simultaneously, the 5G communication system must provide increased user-aware data rates for the UE. To meet this requirement, improved transmit / receive technologies are needed, including more advanced multiple-input multiple-output (MIMO) transmission technologies. Furthermore, the data transmission rates required by 5G communication systems can be met by using a wider frequency bandwidth than 20MHz in the 3GHz to 6GHz or 6GHz or higher frequency bands instead of the 2GHz band currently used by LTE.

[0054] Meanwhile, in 5G communication systems, mMTC is considered to support application services such as the Internet of Things (IoT). To efficiently deliver IoT, mMTC may need to support large-scale UE access within a cell, improve UE coverage, extend battery life, and reduce UE costs. Since IoT is attached to various sensors and devices to provide communication capabilities, it must be able to support a large number of UEs within a cell (e.g., 1,000,000 UEs / km²). Furthermore, because UEs supporting mMTC are likely located in shadow areas of the cell that are not covered due to the nature of the service (such as building basements), mMTC may require a wider coverage area compared to other services provided by 5G communication systems. UEs supporting mMTC must consist of low-cost UEs, and due to the difficulty in frequently replacing UE batteries, very long battery life may be required.

[0055] Finally, URLLC is a cellular wireless communication service for specific purposes (mission-critical) and services, such as remote control of robots or machinery, industrial automation, drones, remote healthcare, and emergency alerts, and must provide ultra-low latency and ultra-high reliability. For example, services supporting URLLC must meet an air interface latency of less than 1 millisecond (ms) and simultaneously meet 10 -5 Or a lower packet error rate requirement. Therefore, for services supporting URLLC, 5G systems must provide shorter Transmission Time Intervals (TTIs) than other services, and must also allocate wider resources in the frequency band as a design requirement. However, the above-described mMTC, URLLC, and eMBB are merely examples of different service types, and the service types to which this disclosure applies are not limited to the examples described above.

[0056] The services considered in the aforementioned 5G communication system should be provided by integrating them based on a unified framework. That is, for efficient resource management and control, it is best to integrate, control, and transmit each service as a single system, rather than operating it independently.

[0057] Furthermore, although LTE, LTE-A, LTE Pro, or New Radio (NR) systems are used below as examples to describe embodiments of this disclosure, embodiments of this disclosure can be applied to other communication systems with similar technical backgrounds or channel types. Moreover, embodiments of this disclosure can be applied to other communication systems with modifications within the scope of this disclosure, based on the judgment of a person skilled in the art.

[0058] This disclosure relates to a method and apparatus for repeatedly transmitting data and control signals between multiple transmission nodes performing cooperative communication and a UE to improve communication reliability.

[0059] According to this disclosure, when using network cooperative communication in a wireless communication system, the reliability of data / control signals received by the UE can be improved.

[0060] The framework of the 5G system will be described in more detail below with reference to the accompanying drawings.

[0061] Figure 1 This is a diagram illustrating the basic structure of the time-frequency domain, which is the radio resource domain for transmitting data or control channels in a 5G system. (Reference) Figure 1 The horizontal and vertical axes represent the time and frequency domains, respectively. The basic unit of resources in both the time and frequency domains is a resource element (RE) 101. An RE can be defined as an orthogonal frequency division multiplexing (OFDM) or single-carrier frequency division multiplexing (SC-FDMA) symbol 102 on the time axis and can be defined as a subcarrier 103 on the frequency axis. A resource block (RB) 104 in the frequency domain can be composed of N... sc RB It consists of a series of REs (e.g., 12).

[0062] Figure 2 This is a diagram illustrating the frame, subframe, and time slot structure in a 5G system.

[0063] refer to Figure 2 An example of the structure of frame 200, subframe 201, and time slot 202 is shown. A frame 200 can be defined as 10 ms. A subframe 201 can be defined as 1 ms, and therefore a frame 200 can consist of a total of 10 subframes 201. A time slot 202 and 203 can be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). A subframe 201 may consist of one or more time slots 202 and 203, and the number of time slots 202 and 203 in each subframe 201 may vary depending on the settings μ204 and 205 for the subcarrier spacing. Figure 2 In the example, the cases where μ = 0 204 and μ = 1 205 are shown as subcarrier spacing settings. When μ = 0 204, a subframe 201 can consist of one time slot 202, and when μ = 1 205, a subframe 201 can consist of two time slots 203. That is, the number of time slots in each subframe depends on the subcarrier spacing setting value μ. They can be different, and therefore, the number of time slots per frame. They can be different. The value μ is set according to the interval of each subcarrier. and It can be defined in Table 1 below.

[0064] [Table 1]

[0065]

[0066]

[0067] In NR systems, a component carrier (CC) or serving cell can consist of up to 250 or more RBs. Therefore, when the UE always receives the entire serving cell bandwidth (as in LTE), the UE's power consumption can be very high. To address this issue, the base station can configure one or more bandwidth portions (BWPs) for the UE to allow the UE to change the receiving area within the cell.

[0068] In NR systems, the base station can configure the initial BWP (Bandwidth Buffer) for the UE, i.e., the bandwidth of CORESET#0 (or Common Search Space (CSS)), via the MIB. Subsequently, the base station can configure the UE's first BWP via Radio Resource Control (RRC) signaling and provide at least one BWP setting that can be indicated in the future via Downlink Control Information (DCI). The base station can then indicate to the UE which frequency band the UE will use by notifying the BWP ID via DCI. If the UE does not receive DCI in its currently allocated BWP for a specific period or longer, the UE will attempt to receive DCI by reverting to the default BWP.

[0069] Figure 3 An example of the configuration of the bandwidth portion in a wireless communication system according to an embodiment of the present disclosure is shown. Reference Figure 3 , Figure 3 An example is shown where the UE bandwidth 300 is configured as two bandwidth portions (i.e., BWP#1 305 and BWP#2 310). (Compared to...) Figure 3 Unlike other examples, multiple bandwidth sections can be configured to overlap. A base station can configure one or more bandwidth sections for a UE, and the information shown in Table 2 below can be configured for each bandwidth section.

[0070] [Table 2]

[0071]

[0072]

[0073] In addition to the configuration information described in Table 2, various parameters related to bandwidth portions can be configured for the UE. This information can be sent from the base station to the UE via higher-level signaling (e.g., RRC signaling). At least one of the configured bandwidth portions can be activated. Information regarding whether a configured bandwidth portion is activated can be semi-statically sent from the base station to the UE via RRC signaling, or dynamically sent via the MAC control element (CE) or DCI.

[0074] The bandwidth portion supported by 5G communication systems can be configured for a variety of purposes.

[0075] As an example, when the bandwidth supported by the UE is less than the system bandwidth, the bandwidth supported by the UE can be configured through the bandwidth portion configuration. For example, in Table 2, since the frequency position of the bandwidth portion is configured for the UE, the UE can send and receive data at a specific frequency position within the system bandwidth.

[0076] As another embodiment, to support different sets of parameters (subcarrier spacing, time slot or micro-time slot length, etc.), the base station can configure multiple bandwidth portions for the UE. For example, to support data transmission and reception to any UE using a 15kHz subcarrier spacing and a 30kHz subcarrier spacing, the two bandwidth portions can be configured to use 15kHz and 30kHz subcarrier spacings respectively. The different bandwidth portions can be frequency division multiplexing (FDM), and the bandwidth portion configured for the corresponding subcarrier spacing can be activated when data is transmitted / received at a specific subcarrier spacing.

[0077] As another embodiment, to reduce UE power consumption, the base station can configure bandwidth portions with different bandwidth sizes for the UE. For example, when the UE supports a very large bandwidth, such as 100MHz, and always uses the corresponding bandwidth to send and receive data, it may result in very high power consumption. In particular, it is very inefficient in terms of power consumption for the UE to unnecessarily monitor the downlink control channel over a large bandwidth of 100MHz when there is no service. Therefore, to reduce UE power consumption, the base station can configure a bandwidth portion with a relatively narrow bandwidth, such as a 20MHz bandwidth portion. When there is no service, the UE can use the 20MHz bandwidth portion for monitoring, and when data is generated, the UE can use the 100MHz bandwidth portion to send / receive data according to the instructions of the base station.

[0078] Figure 4 This is an illustration showing examples of instructions and changes in bandwidth portions according to some embodiments of a wireless communication system according to embodiments of the present disclosure.

[0079] refer to Figure 4 As shown in Table 2 above, the base station can configure one or more bandwidth sections for the UE, and can inform the UE about the bandwidth of the bandwidth section, the frequency location of the bandwidth section, and the parameter set (numerology) of the bandwidth section by configuring each bandwidth section. Figure 4An example is shown where two bandwidth portions, namely bandwidth portion #1 (BWP#1) 405 and bandwidth portion #2 (BWP#2) 410, are configured for a UE in UE bandwidth 400. One or more bandwidth portions can be activated within the configured bandwidth, and... Figure 4 One example that could be considered is activating a portion of the bandwidth. Figure 4 In this configuration, bandwidth portion #1 402 within the bandwidth portion configured in time slot #0 425 is active, and the UE can monitor the Physical Downlink Control Channel (PDCCH) in control area #1 445 configured in bandwidth portion #1 405, and transmit and receive data 455 in bandwidth portion #1 405. The control area in which the UE receives the PDCCH can vary depending on which bandwidth portion is active, and therefore, the bandwidth for which the UE monitors the PDCCH can change.

[0080] The base station may additionally send an indicator to the UE to change the configuration of a bandwidth portion. In this case, changing the configuration of a bandwidth portion can be considered the same as activating a specific bandwidth portion (e.g., switching activation from bandwidth portion A to bandwidth portion B). The base station may send a configuration switching indicator to the UE in a specific time slot, and after receiving the configuration switching indicator from the base station, the UE can determine the bandwidth portion to be activated by applying the changed configuration from a specific point in time according to the configuration switching indicator, and can monitor the PDCCH in the control area configured in the activated bandwidth portion.

[0081] exist Figure 4 In this configuration, the base station can send a configuration switching indicator 415, which instructs the UE to change the active bandwidth portion from the existing bandwidth portion #1 405 to bandwidth portion #2 410 in time slot #1 430. Upon receiving the indicator, the UE can activate bandwidth portion #2 410 according to its content. In this case, a transition time 420 may be required for changing the bandwidth portion, thus allowing the timing of changing and applying the active bandwidth portion to be determined. Figure 4 This illustrates a transition time 420 required after receiving the configuration switching indicator 415, which is one time slot. During the transition time 420, data transmission / reception 460 can be omitted. Therefore, bandwidth portion #2 410 is activated in time slot #2 435, and operations of transmitting and receiving control channels and data through the corresponding bandwidth can be performed.

[0082] The base station can pre-configure one or more bandwidth portions for the UE via higher-layer signaling (e.g., RRC signaling), and activation can be indicated by configuring a switching indicator 415 to be mapped to one of the bandwidth portion configurations pre-configured by the base station. For example, a [log2N]-bit indicator can be used to indicate the selection of one of N pre-configured bandwidth portions. Table 3 below describes an example of using a 2-bit indicator to indicate configuration information regarding bandwidth portions.

[0083] [Table 3]

[0084] Indicator value Bandwidth configuration 00 Bandwidth configuration A via higher-layer signaling 01 Bandwidth configuration B via higher-layer signaling 10 Bandwidth configuration via higher-layer signaling C 11 Bandwidth configuration via higher-layer signaling D

[0085] exist Figure 4 The configuration switching indicator 415 for the bandwidth portion described herein can be delivered from the base station to the UE in the form of Media Access Control (MAC) Control Element (CE) signaling or L1 signaling (e.g., public DCI, group public DCI, and UE-specific DCI).

[0086] According to Figure 4 The configuration switching indicator 415 for the bandwidth portion, as described above, may have its application of bandwidth portion activation dependent on the following: The application of the configuration change may follow a predefined value (e.g., applying the configuration change after N (≥1) time slots following the receipt of the configuration switching indicator), or it may be configured by the base station for the UE via higher-layer signaling (e.g., RRC signaling), or it may be partially included in the content of the configuration switching indicator 415 and transmitted. Alternatively, it may be determined by a combination of the methods described above. After receiving the configuration switching indicator 415 for the bandwidth portion, the UE may apply the changed configuration from the time point obtained by the methods described above.

[0087] The downlink control channel in a 5G communication system will be described in more detail below with reference to the accompanying drawings.

[0088] Figure 5 This is an illustration of an example of a control region in a wireless communication system according to embodiments of the present disclosure, configured with a downlink control channel according to some embodiments.

[0089] refer to Figure 5 , Figure 5 This illustrates configuring a UE bandwidth portion 510 on the frequency axis and configuring two control regions (control resource set, CORESET, and...) in a time slot 520 on the time axis. Figure 5The example provided shows the configuration of control region #1 (501) and control region #2 (502). Control regions 501 and 502 can be configured as specific frequency resources 503 within the entire UE bandwidth portion 510 on the frequency axis. Control regions 501 and 502 can be configured with one or more OFDM symbols on the time axis and can be defined by the control region length (control resource set duration, 504). Figure 5 In the example, control region #1 501 can be configured to a control region length of 2 symbols, and control region #2 502 is configured to a control region length of 1 symbol.

[0090] In the aforementioned 5G system, the control region can be configured for the UE by the base station through higher-level signaling (e.g., system information, master information block (MIB), radio resource control (RRC) signaling). Configuring the control region for the UE involves providing information such as the control region identifier (identity), the frequency location of the control region, and the symbol length of the control region. For example, this may include the information in Table 4.

[0091] [Table 4]

[0092]

[0093]

[0094] In Table 4, the tci-StatesPDCCH (Transmission Configuration Indication (TCI) status) configuration information may include information about one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices that have a quasi-corresponding (QCL) relationship with the demodulation reference signal (DMRS) or channel state information reference signal (CSI-RS) index transmitted in the corresponding control area.

[0095] QCL can be expressed as follows. Between two antenna ports, for example, if the large-scale properties of a radio channel transmitting one symbol through one antenna port can be inferred from the large-scale properties of a radio channel transmitting one symbol through another antenna port, then the two antenna ports can be said to have QCL. That is, a QCL relationship means that it can be assumed that all or part of the large-scale properties of the signal (or the radio channel corresponding to the corresponding antenna port) received by the UE from one antenna port are the same as the large-scale properties of the signal (or the radio channel corresponding to the corresponding antenna port) received from the other antenna port. Large-scale properties include frequency offset-related Doppler spread, Doppler offset, time offset-related average delay, delay spread, etc., and may also include average gain or spatial parameters.

[0096] The configuration of TCI status can include the following information.

[0097] [Table 5]

[0098]

[0099]

[0100] Referring to the TCI state configuration, the index of the reference RS in the QCL relationship can be configured, namely, the cell index and / or BWP index, as well as the QCL type of the reference RS along with the SS / PBCH block index or CSI-RS index. The QCL type indicates the channel characteristics assumed to be shared between the reference RS and the control area DMRS, and examples of possible QCL types are as follows.

[0101] -QCL Type A: Doppler offset, Doppler spread, average delay, and delay spread

[0102] -QCL Type B: Doppler offset and Doppler extension

[0103] -QCL Type C: Doppler offset and mean delay

[0104] -QCL type D: Spatial Rx parameter

[0105] TCI status can be similarly configured not only for control area DMRS, but also for other target RSs, such as PDSCH DMRS and CSI-RS.

[0106] Next, the downlink control information (DCI) in the NR system will be described in detail. In the NR system, scheduling information for uplink data (or Physical Uplink Shared Channel (PUSCH)) or downlink data (or Physical Downlink Data Channel (PDSCH)) is transmitted from the base station to the UE via DCI. For effective control channel reception by the UE, various types of DCI formats are provided according to their purpose, as shown in Table 6 below.

[0107] [Table 6]

[0108]

[0109]

[0110] The UE can monitor the DCI format used for fallback and the non-fallback DCI format used for PUSCH or PDSCH. The DCI format used for fallback can be configured as a fixed field predetermined between the base station and the UE, and the DCI format used for non-fallback can include configurable fields.

[0111] DCI messages can be transmitted via PDCCH after the channel coding and modulation process. Cyclic Redundancy Check (CRC) can be appended to the DCI message payload and can be scrambled using a Radio Network Temporary Identifier (RNTI) corresponding to the UE's identity. Different RNTIs can be used depending on the purpose of the DCI message (e.g., UE-specific data transmission, power control command, or random access response). That is, the RNTI may not be explicitly transmitted but can be included in the CRC calculation process. When a DCI message is received on the PDCCH, the UE can use the assigned RNTI to identify the CRC. If the CRC identification is correct, the UE can determine that the corresponding message has been sent.

[0112] For example, the DCI for scheduling PDSCH for System Information (SI) can be scrambled by SI-RNTI. The DCI for scheduling PDSCH for Random Access Response (RAR) messages can be scrambled by RA-RNTI. The DCI for scheduling PDSCH for paging messages can be scrambled by P-RNTI. The DCI for providing Slot Format Indicator (SFI) can be scrambled by SFI-RNTI. The DCI for providing Transmit Power Control (TPC) can be scrambled by TPC-RNTI. The DCI for providing downlink data channel interruption information can be scrambled by INT-RNTI.

[0113] The DCI of the scheduling UE-specific PDSCH or PUSCH can be scrambled by C-RNTI (cell RNTI).

[0114] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, and in this case, CRC can be scrambled by C-RNTI. The DCI format 0_0 with CRC scrambled by C-RNTI can include the information shown in Table 7 below.

[0115] [Table 7]

[0116] -DCI format identifier (DCI format identifier)-[1] bits

[0117] -Frequency Domain Resource Assignment- Bit

[0118] -Time-domain resource assignment-4 bits

[0119] -Frequency hopping flag-1 bit.

[0120] -Modulation and coding scheme-5 bits

[0121] -New data indicator-1 bit

[0122] -Redundant version-2 bits

[0123] -HARQ process number-4 digits

[0124] - TPC commands for scheduled PUSCH (transmit power control commands for scheduled PUSCH) - [2] bits

[0125] -UL / SUL indicator (uplink / supplementary UL indicator) - 0 or 1 bit

[0126] DCI format 0_1 ​​can be used as a non-back-off DCI for scheduling PUSCH, in which case CRC can be scrambled by C-RNTI. The CRC-scrambled DCI format 0_1 ​​can include the information shown in Table 8 below.

[0127] [Table 8]

[0128] -Carrier indicator-0 or 3 bits

[0129] -UL / SUL indicator-0 or 1 digit

[0130] -DCI format identifier-[1] bit

[0131] -Bandwidth section indicator -0 bits, 1 bit, or 2 bits

[0132] -Frequency domain resource allocation

[0133] For resource allocation type 0, Bit

[0134] For resource allocation type 1, Bit

[0135] -Time-domain resource assignment-1, 2, 3, or 4 digits

[0136] -VRB to PRB mapping (Virtual Resource Block to Physical Resource Block mapping) - 0 or 1 bit, used only for resource allocation type 1.

[0137] ○ If only resource allocation type 0 is configured, then the value is 0.

[0138] ○Otherwise, it is 1 digit.

[0139] - Frequency hopping flag - 0 or 1 bit, used only for resource allocation type 1.

[0140] ○ If only resource allocation type 0 is configured, then the value is 0.

[0141] ○Otherwise, it is 1 digit.

[0142] -Modulation and coding scheme-5 bits

[0143] -New data indicator-1 bit

[0144] -Redundant version-2 bits

[0145] -HARQ process number-4 digits

[0146] -First downlink assignment index-1 or 2 bits

[0147] ○ Used for semi-static HARQ-ACK codebook, 1 bit;

[0148] ○ Used for dynamic HARQ-ACK codebooks with a single HARQ-ACK codebook, which is 2 bits.

[0149] -Second downlink assignment index -0 or 2 bits

[0150] ○ Used for dynamic HARQ-ACK codebooks with two HARQ-ACK subcodebooks, 2 bits;

[0151] ○ Otherwise, it is 0.

[0152] - TPC command for scheduled PUSCH - 2 bits

[0153] -SRS resource indicator- or Bit

[0154] ○ Used for non-codebook-based PUSCH transmission, for Bit;

[0155] ○ Used for codebook-based PUSCH transmission, for Bit.

[0156] -Precoding information and number of layers-Up to 6 bits

[0157] - Antenna Port - Up to 5 bits

[0158] -SRS Request-2 bits

[0159] -CSI Request (Channel State Information Request)- 0 bits, 1 bit, 2 bits, 3 bits, 4 bits, 5 bits, or 6 bits

[0160] -CBG Transmission Information (Code Block Group Transmission Information) - 0 bits, 2 bits, 4 bits, 6 bits, or 8 bits

[0161] -PTRS-DMRS association (phase tracking reference signal-demodulation reference signal association) - 0 bits or 2 bits.

[0162] -β_offset indicator -0 or 2 bits

[0163] -DMRS sequence initialization (demodulation reference signal sequence initialization) - 0 bits or 1 bit

[0164] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, and in this case, CRC can be scrambled by C-RNTI. DCI format 1_0 with CRC scrambled by C-RNTI can include the information shown in Table 9 below.

[0165] [Table 9]

[0166] -DCI format identifier-1 bit

[0167] -Frequency Domain Resource Assignment- Bit

[0168] -Time-domain resource assignment-4 bits

[0169] -VRB to PRB mapping -1 bit

[0170] -Modulation and coding scheme-5 bits

[0171] -New data indicator-1 bit

[0172] -Redundant version-2 bits

[0173] -HARQ process number-4 digits

[0174] -Downlink assignment index-2 bits

[0175] -TPC command for scheduled PUCCH-[2] bit

[0176] -PUCCH Resource Indicator (Physical Uplink Control Channel (PUCCH) Resource Indicator) - 3 bits

[0177] -PDSCH to HARQ feedback timing indicator-[3] bits

[0178] DCI format 1_1 can be used as a non-back-off DCI for scheduling PDSCH, and in this case, CRC can be scrambled by C-RNTI. DCI format 1_1 with CRC scrambled by C-RNTI can include the information shown in Table 10 below.

[0179] [Table 10]

[0180] -Carrier indicator-0 or 3 bits

[0181] -DCI format identifier-[1] bit

[0182] -Bandwidth section indicator -0 bits, 1 bit, or 2 bits

[0183] -Frequency domain resource allocation

[0184] For resource allocation type 0, Bit

[0185] For resource allocation type 1, Bit

[0186] -Time-domain resource assignment-1, 2, 3, or 4 digits

[0187] -VRB to PRB mapping -0 or 1 bit, only used for resource allocation type 1.

[0188] ○ If only resource allocation type 0 is configured, then the value is 0.

[0189] ○Otherwise, it is 1 digit.

[0190] -PRB Bundle Size Indicator (Physical Resource Block Bundle Size Indicator) - 0 or 1 bit

[0191] - Rate Matching Indicator - 0, 1, or 2 bits

[0192] -ZP CSI-RS Trigger (Zero Power Channel State Information - Reference Signal Trigger) - 0 bits, 1 bit, or 2 bits

[0193] For transport block 1:

[0194] -Modulation and coding scheme-5 bits

[0195] -New data indicator-1 bit

[0196] -Redundant version-2 bits

[0197] For transport block 2:

[0198] -Modulation and coding scheme-5 bits

[0199] -New data indicator-1 bit

[0200] -Redundant version-2 bits

[0201] -HARQ process number-4 digits

[0202] - Downlink assignment index - 0, 2, or 4 bits

[0203] - TPC commands for scheduled PUCCH - 2 bits

[0204] -PUCCH resource indicator- 3 digits

[0205] -PDSCH to HARQ_feedback timing indicator-3 bits

[0206] - Antenna port - 4-bit, 5-bit, or 6-bit

[0207] -Transmission Configuration Indicator (TCI) - 0 or 3 bits

[0208] -SRS Request-2 bits

[0209] -CBG Transmission Information- 0 bits, 2 bits, 4 bits, 6 bits, or 8 bits

[0210] -CBG refresh information (code block group refresh information) - 0 or 1 bit

[0211] -DMRS Series Initialization-1 bit

[0212] In NR systems, in addition to the frequency axis resource candidate allocation indicated by BWP, the following detailed frequency domain resource allocation (FDRA) methods can also be provided through DCI. Figure 6 This is an illustration of an example of PDSCH frequency domain resource allocation in a wireless communication system according to an embodiment of the present disclosure.

[0213] refer to Figure 6 If the UE is configured to use only RA type (resource allocation type) 0 via higher-layer signaling 600, then some DCIs used to allocate PDSCH to the corresponding UE have N RBG A bitmap composed of units. Its conditions will be described again later. At this point, N... RBG This refers to the number of resource block groups (RBGs) as shown in Table 11, determined by the BWP size allocated by the BWP indicator and the higher-level parameter rbg-Size, and data is sent to the RBG indicated by 1 via a bitmap.

[0214] [Table 11]

[0215]

[0216]

[0217] If the UE is configured to use only RA type 1 via higher-layer signaling 6605, then some DCIs that allocate PDSCH to the corresponding UE have the characteristics of... Frequency domain resource allocation information consisting of bits. The base station can configure a starting VRB 620 and a length of 625 of continuously allocated frequency domain resources from it.

[0218] If the UE is configured to use both RA type 0 and RA type 1 via higher-layer signaling 610, then some DCIs allocating PDSCH for the corresponding UE have frequency domain resource allocation information, which consists of bits of the larger of payload 615 for configuring RA type 0 and payloads 620 and 625 for configuring RA type 1, valued at 635. The conditions will be described again later. At this time, a bit can be added to the first part (MSB) of the frequency domain resource allocation information in the DCI, and when the bit is 0, it indicates the use of RA type 0, and when the bit is 1, it indicates the use of RA type 1.

[0219] Figure 7 This is an illustration of an example of PDSCH time axis resource allocation in a wireless communication system according to an embodiment of the present disclosure. Reference Figure 7 The base station can determine the subcarrier spacing (μ) of the data and control channels configured via higher layers, scheduling offset (K0) values, and DCI. PDSCH μ PDCCH The starting position 700 and length 705 of the OFDM symbol in a time slot 710 are dynamically indicated to indicate the time axis position of the PDSCH resource.

[0220] The DCI may include a time-domain resource allocation field indicating the start position, length, etc. of OFDM symbols, and the time-domain resource allocation field may be indicated by higher-layer signaling as a value from a table consisting of up to 16 entries. Each entry may include PDCCH to PDSCH time slot timing (corresponding to the time slot unit time interval between the time of receiving the PDCCH and the time of sending the PDSCH scheduled by the PDCCH, denoted as K0), information about the position and length of the start symbol for scheduling the PDSCH in the time slot, PDSCH mapping type information indicating the DMRS position allocation information, etc.

[0221] Figure 8 This is an illustration of an example of PDSCH time axis resource allocation based on the subcarrier spacing of the data channel and the control channel in a wireless communication system according to an embodiment of the present disclosure.

[0222] refer to Figure 8 When the subcarrier spacing of the data channel and the control channel is the same (μ) PDSCH =μ PDCCH At time 800, since the data channel and control channel have the same time slot number, the base station and UE can identify that the scheduling offset occurs according to the predetermined time slot offset K0. On the other hand, when the subcarrier spacing of the data channel and control channel is different (μ... PDSCH ≠μ PDCCH At 805, because the time slot numbers of the data channel and the control channel are different, the base station and the UE can identify that the scheduling offset occurs according to the predetermined time slot offset K0 of the subcarrier interval based on PDCCH.

[0223] Next, a portion of the decoding process of PDSCH scheduled by DCI in the NR system will be described in detail.

[0224] The UE is indicated by the modulation and coding scheme (MCS) of the PDSCH and the DCI (Distributed Information Center) which allocates frequency and time resources for the PDSCH. The MCS field of the DCI indicates an index of one of the following three tables (Table 12 (PDSCH MCS Index Table 1), Table 13 (PDSCH MCS Index Table 2), and Table 14 (PDSCH MCS Index Table 3)) selected by a higher layer. The range of the index indicated during initial transmission and HARQ retransmission may differ. During initial transmission, indices 0 to 28 of Table 12, indices 0 to 27 of Table 13, and indices 0 to 28 of Table 14 are used; and during retransmission, indices 29 to 31 of Table 12, indices 28 to 31 of Table 13, and indices 29 to 31 of Table 14 are used. The index indicated during initial transmission contains the modulation order and target coding rate information of the transmitted PDSCH, while the index indicated during retransmission contains the modulation order information of the transmitted PDSCH.

[0225] [Table 12]

[0226]

[0227] [Table 13]

[0228]

[0229] [Table 14]

[0230]

[0231] In the initial transmission case, the UE needs to know the size of the transport block (TB) before encoding the scheduled PDSCH. For this purpose, the following procedure is performed, and if two TBs are transmitted, the following procedure is performed for each codeword.

[0232] Step 1) The UE calculates the time slot and physical resource block (PRB) allocated to the PDSCH transmission (where in The total number of resource elements (REs) allocated to PDSCH (Programmable Distributed Storage and Communication) transmissions. In the formula used to calculate the total number of REs allocated to PDSCH transmissions, This represents 12, which is the number of subcarriers in a PRB, and This indicates the number of symbols for scheduling PDSCH in a time slot. Furthermore, This indicates the number of REs allocated to DM-RS in the PRB, which includes the overhead indicated on the DCI by the DM-RS CDM group for which there is no data. Furthermore, The overhead value is indicated by the higher-level indication. Next, the total number of REs used for the entire PRB is calculated as N. RE =min(156, N′R) E) ·mPRB And n PRB This indicates the total number of PRBs allocated for PDSCH transmissions to the UE in the formula for calculating the total number of REs used for the entire scheduled PRB.

[0233] Step 2) The number of intermediate information bits in the PDSCH is calculated to be N. info =N RE ·R·Q m ·v, where R and Q m The target rate and modulation order indicated by the MCS are respectively, and v indicates the number of layers.

[0234] Step 3) If the calculated N info If the value is greater than 3,824, the UE determines that multiple code blocks can be sent (step 5); otherwise, the UE determines that a single code block can be sent (step 4).

[0235] Step 4) When the UE determines to send a single code block, the UE calculates... in And then find in Table 15 that is not less than N' info The minimum transport block size (TBS). The TBS found by the UE is the transport block (TB) size determined by the UE.

[0236] Step 5) When the UE determines that multiple code blocks can be sent, the UE determines the value... (in ) and target bitrate, execute the following procedure.

[0237] -Step 5-1) When the target bitrate is ≤1 / 4: in The calculated C indicates the number of code blocks, and TBS is the size of the TB determined by the UE.

[0238] -Step 5-2) When the target bitrate > 1 / 4: If N' info >8,424 in And the calculated C indicates the number of code blocks. In the opposite case, And send a single code block.

[0239] [Table 15]

[0240] Index TBS Index TBS Index TBS Index TBS 1 24 31 336 61 1288 91 3624 2 32 32 352 62 1320 92 3752 3 40 33 368 63 1352 93 3824 4 48 34 384 64 1416 5 56 35 408 65 1480 6 64 36 432 66 1544 7 72 37 456 67 1608 8 80 38 480 68 1672 9 88 39 504 69 1736 10 96 40 528 70 1800 11 104 41 552 71 1864 12 112 42 576 72 1928 13 120 43 608 73 2024 14 128 44 640 74 2088 15 136 45 672 75 2152 16 144 46 704 76 2216 17 152 47 736 77 2280 18 160 48 768 78 2408 19 168 49 808 79 2472 20 176 50 848 80 2536 21 184 51 888 81 2600 22 192 52 928 82 2664 23 208 53 984 83 2728 24 224 54 1032 84 2792 25 240 55 1064 85 2856 26 256 56 1128 86 2976 27 272 57 1160 87 3104 28 288 58 1192 88 3240 29 304 59 1224 89 3368 30 320 60 1256 90 3496

[0241] 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 during the initial transmission.

[0242] Figure 9This is a diagram illustrating a PDSCH resource mapping method in a wireless communication system according to an embodiment of the present disclosure.

[0243] PDSCH rate matching can refer to a method of skipping specific resources and mapping PDSCH symbols (or downlink data symbols) sequentially. The resources for which rate matching is performed during PDSCH mapping are described below.

[0244] When a UE receives a PDSCH scheduled by a PDCCH (or DCI) scrambled with a CRC including SI-RNTI, and if the DCI's System Information Indicator field indicates 0, it is assumed that no REs (Reserves) are occupied by the SS / PBCH block when the UE receives the corresponding PDSCH. On the other hand, if the field indicates 1, when the UE receives the corresponding PDSCH, since there are REs (or PRBs) pre-occupied by the SS / PBCH block, the UE receives the PDSCH in the remaining resource area excluding the REs in the resource area scheduled by the DCI. The above example also applies to cases where the RNTI is RA-RNTI, P-RNTI, or TC-RNTI.

[0245] When the UE receives a PDSCH or SPS PDSCH scheduled by a PDCCH (or DCI) including a CRC scrambled by C-RNTI, MCS-RNTI, or CS-RNTI, such as Figure 9 As shown, REs configured via higher-layer signaling 910 or 930, or dynamically indicated via L1 signaling 910, may not be used for the corresponding PDSCH transmission. Furthermore, when a scheduled PDSCH overlaps with a PRB including SS / PBCH block transmission based on the ssb-PositionsInBurst information received from SIB1 or the ServingCellConfigCommon higher-layer signal, the UE assumes that the PRB including SS / PBCH is not used for the corresponding PDSCH in the symbols of the SS / PBCH transmission. The specific meaning of the aforementioned specific resource area not being used for PDSCH is as follows: When a portion of the resource area scheduled by the DCI includes resource areas not used for PDSCH, the UE assumes that the PDSCH information (i.e., downlink data) is included in the remaining scheduled resource areas excluding the corresponding area, and receives the remaining scheduled resource areas.

[0246] PDSCH rate matching at the RB symbol level can be performed as follows. In NR systems, the UE can receive up to four RateMatchPatterns per cell and per BWP configured via higher signal. The RateMatchPattern can be one of the following.

[0247] A BWP consists of resource regions comprised of RB-level bitmaps and symbol-level bitmaps. These resource regions can be contiguous or discontinuous and can repeat in time slots. When configured for each serving cell, the subcarrier spacing for the corresponding RateMatchPattern is also provided, and when configured for each BWP, the corresponding RateMatchPattern is assumed to follow the subcarrier spacing of the corresponding BWP. The corresponding resource regions can be configured individually and then combined into one or two rateMatchPatternGroups.

[0248] - The control channel resource area, which is composed of the combination of frequency information of CORESET in BWP and time information of search space, and the corresponding resource area can be configured separately and then combined into one or two rateMatchPatternGroup.

[0249] As an example, the UE is configured via a higher signal through rateMatchPatternGroup information 910 and 915, which consists of RateMatchPattern. When the rate matching indicator (corresponding to the rateMatchPatternGroup) is included in the non-backoff DCI format 1_1 901 and the corresponding value is 1 910, the base station can instruct the UE that the resource area consisting of the RB and symbol level indicated by the corresponding rateMatchPatternGroup is not used for the corresponding PDSCH transmission 905. On the other hand, if the corresponding value is 0 915, the base station can instruct the UE that the resource area consisting of the RB and symbol level indicated by the corresponding rateMatchPatternGroup is used for the corresponding PDSCH transmission. The "rate matching indicator" can consist of up to two bits, and each bit can indicate whether each rateMatchPatternGroup is used for PDSCH transmission. If both bits indicate 1, the base station informs the UE that the resource area consisting of the RB and symbol level, which is the combination of the two rateMatchPatternGroups, is not used for the corresponding PDSCH transmission. Furthermore, although not associated with the “rate matching indicator” included in the non-back-off DCI format 1_1 901, the resource area indicated by the rateMatchPatternGroup configured as a higher signal is not always used for PDSCH or SPS PDSCH scheduled by non-back-off DCI or back-off DCI.

[0250] If the PDSCH scheduled by the PDCCH and the resource area of ​​the CORESET included in the PDCCH partially or completely overlap, then neither the PDCCH resource area scheduled by the corresponding PDSCH nor the DMRS resource area used for PDCCH decoding is used for the corresponding PDSCH.

[0251] PDSCH rate matching for RE levels can be performed as follows. The UE can receive configurations where resource areas comprised of RE levels are not used for PDSCH transmission via the following higher signaling.

[0252] - When the PDSCH has a subcarrier spacing of 15kHz via higher-layer signaling, the UE is configured from the base station by the LTE CRS v-shift as an offset value for a specific RE, the number of LTE CRS ports, and the LTE carrier center frequency location information as an offset value from reference point A. When the UE receives the corresponding higher-layer signal configuration, the UE receives data in the remaining scheduled PDSCH resource areas excluding the corresponding resource area. As an example, when the UE receives LTE CRS-related configuration information via higher-layer signaling before receiving PDCCH 921 (scheduling PDSCH 925), upon receiving PDSCH 925, the UE receives data in the remaining resource areas of the scheduled PDSCH resource areas excluding RE 930 used for LTE CRS.

[0253] -ZP (Zero Power) CSI-RS: Includes ZP-CSI-RS frequency and time resource areas and antenna port numbers, CDM values ​​and modes, as well as transmission period and time slot offset information configured via higher-level signaling. The base station can notify via higher-level signaling that RE-level resource areas associated with periodic or quasi-periodic ZP CSI-RS are not used for PDSCH transmission. On the other hand, for aperiodic ZPCSI-RS, the UE can receive up to three aperiodic ZP CSI-RS resource mode areas configured by the BWP, and can dynamically indicate whether a resource mode area is used for PDSCH transmission using two bits of the non-back-off DCI format 1_1 from the base station. In the case of PDSCH or SPS PDSCH indicated by back-off DCI, the UE determines that the resource area associated with aperiodic ZPCSI-RS is used for PDSCH.

[0254] The above information is rate matching mode information and can be configured for each cell, each BWP, or each TRP (or TCI state).

[0255] Figure 10 This is an illustration of an example of repetitive transmission (slot aggregation) for each slot according to some embodiments in a wireless communication system according to embodiments of the present disclosure.

[0256] refer to Figure 10 In NR systems, repeated transmission of the same PDSCH is supported to improve the PDSCH reception reliability of UE 1000. The base station can configure the number of PDSCH retransmissions through higher layers such as RRC, for example, the pdsch-AggregationFactor in PDSCH-configuration. When the retransmission number is set, the PDSCH scheduled by the DCI can be retransmitted in the same number of time slots as the number of consecutive retransmissions 1005. All retransmitted PDSCHs can be allocated the same time resources within a time slot, which can be the OFDM symbol start position and length indicated by the DCI within a time slot, such as... Figure 7 As shown in Table 16 below. Furthermore, it can be assumed that the same transport block (TB) can be sent to all repeatedly transmitted PDSCHs. The UE can expect that repeatedly transmitted PDSCHs are transmitted only through a single layer. Additionally, the redundancy version (RV) of a repeatedly transmitted PDSCH can be determined based on the redundancy version (RV) value indicated in the DCI that schedules the PDSCH and the index of the repeatedly transmitted PDSCH, as shown in Table 16 below.

[0257] [Table 16]

[0258]

[0259]

[0260] In Table 16, n can indicate the index of each PDSCH within multiple repeated transmissions determined by higher layers 1010 and 1015.

[0261] Referring to the above description of the DCI structure, PDSCH time and frequency resource allocation, and the PDSCH transmission and reception procedures performed thereon, in version 15, when PDSCH is repeatedly transmitted, the NR system only supports transmission using a single transmission point (which can be used interchangeably with Transmit and Receive Points (TRPs), panels, or beams).

[0262] Unlike existing systems, 5G wireless communication systems can support not only services requiring high transmission rates, but also services with extremely short transmission delays and services requiring high connection density. In wireless communication networks comprising multiple cells, TRPs, or beams, cooperative transmission between each cell, TRP, and / or beam is one of the key technologies that can meet various service requirements by increasing the signal strength received by the UE or effectively implementing interference control between each cell, TRP, and / or beam. If cooperative communication using multiple transmission points can be applied during repeated PDSCH transmissions, more robust performance in terms of channel congestion is expected, and therefore, repeated transmission schemes using multiple transmission points are being actively discussed. In this case, to improve the UE's reception reliability, it is necessary to combine the TRP and / or transmitted signals for each beam.

[0263] Embodiments of this disclosure will be described in detail with reference to the accompanying drawings. Furthermore, in describing this disclosure, detailed descriptions of relevant functions or configurations will be omitted if it is determined that such detailed descriptions might unnecessarily obscure the subject matter of this disclosure. Additionally, the terminology described later is defined in consideration of the functions in this disclosure and may vary depending on the intent or customization of the user or operator. Therefore, definitions should be based on the overall content of this disclosure.

[0264] Although NR or LTE / LTE-A systems are used as examples to describe embodiments of this disclosure, embodiments of this disclosure can be applied to other communication systems with similar technical backgrounds or channel types. Furthermore, embodiments of this disclosure can be applied to other communication systems with modifications that, in the judgment of a person skilled in the art, do not materially depart from the scope of this disclosure.

[0265] The contents of this disclosure apply to FDD and TDD systems.

[0266] In this disclosure, higher signaling (or higher signaling, higher layer signaling, higher layer configuration, higher layer, etc. can be mixed) is a signal transmission method that uses the downlink data channel of the physical layer to send signals from the base station to the UE or uses the uplink data channel of the physical layer to send signals from the UE to the base station, and may also be referred to as RRC signaling, PDCP signaling, or Media Access Control (MAC) control element (MAC CE).

[0267] In this disclosure, an L1 signal is a type of signal transmitted from a base station to a UE at the physical layer, and can be interpreted as a specific field in the DCI, DCI format, RNTI of the CRC scrambled to the DCI, CORESET of the transmitted DCI, or search space. Therefore, to distinguish by L1 signal means to distinguish by the above examples.

[0268] In this disclosure, when determining whether to apply cooperative communication, the UE can use various methods, such as assigning a PDCCH with cooperative communication applied to it having a specific format, assigning a PDCCH with cooperative communication applied to it including a specific indicator indicating whether cooperative communication is applied, assigning a PDCCH with cooperative communication applied to it being scrambled by a specific RNTI, or assuming that cooperative communication is applied in a specific part indicated by a higher layer. Furthermore, cooperative communication application is possible when the UE reports the application of cooperative communication via a UE capability report or higher-layer signaling. In the following, for ease of description, the case where the UE receives a PDSCH with cooperative communication applied under similar conditions can be referred to as the incoherent joint transmission (NC-JT) case.

[0269] In this disclosure, determining the priority between A and B can mean: selecting the one with higher priority according to a predetermined priority rule and performing the corresponding operation, or omitting or discarding operations with lower priority, etc.

[0270] In this disclosure, the above examples will be described through multiple embodiments, but these embodiments are not independent and one or more embodiments may be applied simultaneously or in combination.

[0271] Next, cooperative communication will be described in detail. Joint Transmission (JT) is a representative transmission technology for the aforementioned cooperative communication, and it supports a UE through different cells, TRPs, and / or beams to increase the signal strength received by the UE. On the other hand, since the characteristics of the channel between each cell, TRP, and / or beam and the UE may be significantly different, it is necessary to apply different precoding, MCS, resource allocation, etc. to the link between each cell, TRP, and / or beam and the UE. Specifically, in the case of non-interference coding non-coherent joint transmission (NC-JT) supporting each cell, TRP, and / or beam, it is important to configure separate downlink transmission information for each cell, TRP, and / or beam. This separate DL transmission information configuration for each cell, TRP, and / or beam is a major factor in increasing the payload required for DL ​​DCI transmission, which may adversely affect the reception performance of the PDCCH transmitting DCI. Therefore, it is necessary to carefully design the trade-off between the DCI information volume and the PDCCH reception performance used to support JT.

[0272] Figure 11 This is an illustration showing an example of antenna port configuration and resource allocation for cooperative communication according to some embodiments of a wireless communication system according to embodiments of the present disclosure.

[0273] refer to Figure 11This illustrates an example of radio resource allocation for each TRP based on the joint transmission technology and scenario. 1100 is an example of coherent joint transmission (C-JT) supporting phase interferocoding between each cell, TRP, and / or beam. In C-JT, a single data packet (PDSCH) is transmitted from TRP A 1105 and TRP B 1110 to UE 1115, and joint precoding is performed across multiple TRPs. This means that the data is transmitted using the same DMRS ports (e.g., DMRS ports A and B in two TRPs) so that the same PDSCH is received in TRP A 1105 and TRP B 1110. In this case, the UE can receive a single DCI message for receiving a PDSCH demodulated by DMRS ports A and B.

[0274] 1120 is an example of noncoherent joint transmission (NC-JT) supporting non-interference coding between each cell, TRP, and / or beam. In the case of NC-JT, PDSCH is sent to UE 1135 for each cell, TRP, and / or beam, and separate precoding can be applied to each PDSCH. Sending different PDSCHs for each cell, TRP, and / or beam can improve throughput compared to single-cell, TRP, and / or beam transmission, or the same PDSCH can be repeatedly sent for each cell, TRP, and / or beam to improve reliability compared to single-cell, TRP, and / or beam transmission.

[0275] Various radio resource allocations can be considered, such as case 1140 where all frequency and time resources used by multiple TRPs for PDSCH transmission are the same, case 1145 where the frequency and time resources used by multiple TRPs do not overlap at all, and case 1150 where some frequency and time resources used by multiple TRPs overlap. In each of the above radio resource allocation cases, when multiple TRPs repeatedly transmit the same PDSCH to improve reliability, if the receiving UE fails to identify whether the corresponding PDSCH is being repeatedly transmitted, the reliability improvement may be limited because the UE cannot perform combination for the corresponding PDSCH at the physical layer. Therefore, the UE should be able to identify the frequency and time resources used by each of the multiple TRPs during the repeated transmission of PDSCH.

[0276] To assign multiple PDSCHs to a single UE simultaneously to support NC-JT, various types, structures, and relationships of DCIs can be considered.

[0277] Figure 12 This is an illustration of an example of a DCI configuration for cooperative communication in a wireless communication system according to an embodiment of the present disclosure. Reference Figure 12Four examples of DCI designs for supporting NC-JT are shown.

[0278] Case #1 1200 is an example where the control information for PDSCH transmitted in N-1 additional TRPs is sent in the same form (same DCI format) as the control information for PDSCH transmitted in the serving TRP. In this case, N-1 different PDSCHs are transmitted from N-1 additional TRPs (TRP #1 to TRP #(N-1)) other than the serving TRP (TRP #0) used for a single PDSCH transmission. That is, the UE can obtain the control information for PDSCHs transmitted in different TRPs (TRP #0 to TRP #(N-1)) through DCIs (DCI #0 to DCI #(N-1)) with the same DCI format and the same payload. In Case #1, the degree of freedom for each PDSCH control (assignment) can be fully guaranteed, but when each DCI is transmitted in different TRPs, the coverage of each DCI may differ, and the reception performance may degrade.

[0279] Case #2 1205 is an example in which the control information of PDSCH transmitted in N-1 additional TRPs is transmitted in a different form (different DCI format or different DCI payload) than the control information of PDSCH transmitted in the serving TRP. In this case, N-1 different PDSCHs are transmitted from N-1 additional TRPs (TRP#1 to TRP#(N-1)) other than the serving TRP (TRP#0) used for a single PDSCH transmission. For example, in the case of DCI#0, which is the control information of PDSCH transmitted in the serving TRP (TRP#0), all information elements of DCI format 1_0 to DCI format 1_1 are included. However, in the case of a shortened DCI (hereinafter referred to as sDCI) (sDCI#0 to sDCI#(N-2)), which is the control information of PDSCH transmitted in the cooperating TRPs (TRP#1 to TRP#(N-1)), only some information elements of DCI format 1_0 to DCI format 1_1 may be included. Therefore, in the case of sDCI transmitting control information for PDSCH sent in the cooperative TRP, compared to the normal DCI (nDCI) used to transmit control information related to PDSCH sent in the serving TRP, it can include as many reserved bits as possible, or fewer bits compared to the nDCI, as in the case of a smaller payload. In case #2, the degree of freedom for each PDSCH control (assignment) can be limited according to the content of the information elements included in the sDCI, but since the reception performance of sDCI is superior to that of nDCI, the probability of coverage differences occurring in each DCI can be reduced.

[0280] Case #3 1210 is another example where the control information for PDSCH transmitted in N-1 additional TRPs is transmitted in a different form (different DCI format or different DCI payload) than the control information for PDSCH transmitted in the serving TRP. In this case, N-1 different PDSCHs are transmitted from N-1 additional TRPs (TRP#1 to TRP#(N-1)) other than the serving TRP (TRP#0) used for a single PDSCH transmission. For example, in the case of DCI#0, which is the control information for PDSCH transmitted in the serving TRP (TRP#0), all information elements of DCI formats 1_0 to 1_1 are included, while in the case of control information for PDSCH transmitted in the cooperating TRPs (TRP#1 to TRP#(N-1)), only some information elements of DCI formats 1_0 to 1_1 can be collected and transmitted in an auxiliary DCI (sDCI).

[0281] For example, sDCI may include at least one of HARQ-related information, such as frequency domain resource allocation, time domain resource allocation, and MCS of the cooperative TRP. Furthermore, in cases where information not included in the sDCI (such as the Bandwidth Part (BWP) indicator or carrier indicator) is present, the DCI of the serving TRP (DCI#0, normal DCI, nDCI) may be followed. In case #3, the degrees of freedom for each PDSCH control (allocation) can be limited based on the content of the information elements included in the sDCI, but the sDCI reception performance can be adjusted, and the complexity of blind decoding of the UE's DCI can be reduced compared to case #1 or case #2.

[0282] Case #4 1215 is an example where the control information for PDSCH transmitted in N-1 additional TRPs is sent in the same form (long DCI, i.e., lDCI) as the control information for PDSCH transmitted in the serving TRP. In this case, N-1 different PDSCHs are transmitted from N-1 additional TRPs (TRP #1 to TRP #(N-1)) other than the serving TRP (TRP #0) used for a single PDSCH transmission. That is, the UE can obtain the control information for PDSCHs transmitted in different TRPs (TRP #0 to TRP #(N-1)) through a single DCI. In Case #4, the complexity of the UE's blind DCI decoding may not increase, but the freedom of PDSCH control (allocation) may be lower, such as the limited number of cooperating TRPs due to long DCI payload limitations.

[0283] In the following description and embodiments, sDCI may be referred to as various auxiliary DCIs, such as shortened DCIs, auxiliary DCIs, or normal DCIs that include PDSCH control information sent in the cooperative TRP (DCI formats 1_0 to 1_1 above), and unless otherwise specified, the description also applies to various auxiliary DCIs.

[0284] In the following description and embodiments, the above-described cases #1, #2 and #3, in which one or more DCIs (PDCCHs) are used to support NC-JT, can be distinguished as multiple PDCCH-based NC-JTs (or cooperative communication based on multiple DCIs), and the above-described case #4, in which a single DCI (PDCCH) is used to support NC-JT, can be distinguished as a single PDCCH-based NC-JT (cooperative communication based on a single DCI).

[0285] In embodiments of this disclosure, the cooperative TRP can be replaced with various terms in practical applications, such as cooperative panel or cooperative beam.

[0286] In the embodiments of this disclosure, the application of NC-JT can be interpreted differently depending on the circumstances, such as when the UE receives one or more PDSCHs simultaneously in a BWP, when the UE receives PDSCHs simultaneously in a BWP based on two or more Transport Configuration Indicators (TCIs), when the PDSCHs received by the UE are associated with one or more DMRS port groups, etc. However, for ease of explanation, one expression is used.

[0287] In this disclosure, the radio protocol structure of NC-JT can be used in various ways depending on the TRP deployment scenario. As an example, if there is no backhaul delay or the backhaul delay is very small between cooperating TRPs, a structure based on MAC layer multiplexing can be used. This can be understood as a method similar to carrier aggregation. On the other hand, when the backhaul delay between cooperating TRPs is large enough to be non-negligible (e.g., when the exchange of channel state information or scheduling information between cooperating TRPs takes more than 2 ms), anti-latency characteristics can be ensured by using an independent structure for each TRP from the RLC layer. This can be understood as a method similar to dual connectivity.

[0288] Figures 13A, 13B, 13C, and 13D are illustrations showing examples of repeated transmissions of multiple TRPs in a wireless communication system applying various resource allocation methods according to embodiments of the present disclosure. Referring to Figure 13, an example is shown in which two or more TRPs repeatedly transmit the same PDSCH.

[0289] Figure 13A is an illustration of an example of repeated PDSCH transmission using multiple TRPs. In current NR systems, as described above, the same number of time slots as the number of repeated transmissions are required to repeatedly transmit the same PDSCH, and each repeated transmission uses the same cell, TRP, and / or beam. On the other hand, as in 1300 and 1305, different TRPs are used for each repeated transmission in each time slot, enabling higher reliability. Here, 1300 is an example where a single DCI schedules repeated PDSCH transmissions in TRPs 1 and 2, and 1305 is an example where multiple DCIs corresponding to TRPs 1 and 2 schedule repeated PDSCH transmissions to be transmitted in each TRP respectively.

[0290] On the other hand, other repetitive transmission methods can be used based on the UE's capabilities and latency requirements, the status of available resources between TRPs, etc. Figure 13B is an illustration of another example of repetitive PDSCH transmission using multiple TRPs. For example, if the UE has the capability to receive NC-JT, each TRP can improve frequency resource utilization and reduce the latency required for PDSCH decoding by using the method of transmitting the same PDSCH in the same time and frequency resources 1310 and 1315. In this case, 1310 is an example where a single DCI schedules repetitive PDSCH transmission in TRPs 1 and 2, and 1315 is an example where multiple DCIs corresponding to TRPs 1 and 2 are respectively scheduled to transmit repetitive PDSCH transmissions in each TRP. This method is effective when the beams between TRPs to be transmitted simultaneously are nearly orthogonal to each other, thus minimizing beam interference.

[0291] Figure 13C is an illustration of another example of repeated PDSCH transmission using multiple TRPs. As another example, each TRP can use methods 1320 and 1325 to transmit the same PDSCH in the same time and frequency resources that do not overlap with each other. Here, 1320 is an example where a single DCI schedules repeated PDSCH transmissions in TRPs 1 and 2, and 1325 is an example where multiple DCIs corresponding to TRPs 1 and 2 are respectively scheduled to transmit repeated PDSCH transmissions in each TRP. This method is effective when there is significant inter-beam interference in the TRPs to be transmitted simultaneously and when there are many available frequency resources for each TRP.

[0292] Figure 13D is an illustration of another example of repeated PDSCH transmission using multiple TRPs. As another example, each TRP can use methods 1330 and 1335 to transmit the same PDSCH in different OFDM symbols within the same time slot. Here, 1330 is an example where a single DCI schedules repeated PDSCH transmissions in TRPs 1 and 2, and 1335 is an example where multiple DCIs corresponding to TRPs 1 and 2 are respectively scheduled to transmit repeated PDSCH transmissions in each TRP. This method is effective when there are limited frequency resources available for each TRP and the data size to be transmitted is small. Modifications based on the methods described above are also possible.

[0293] In the above method, a single DCI can be used to schedule repeated transmissions 1300, 1310, 1320, and 1330, and the DCI can indicate a list of all TRPs to participate in the repeated transmission. The list of TRPs to be repeatedly transmitted can be indicated in the form of a TCI status list, and the length of the TCI status list can be dynamically changed. Corresponding DCIs can be repeatedly transmitted to improve reliability, and different beams can be applied to each DCI during repeated transmissions.

[0294] Alternatively, multiple DCIs can be used to schedule repeated transmissions 1305, 1315, 1325, and 1335, and each DCI can correspond to a different TRP's PDSCH to participate in repeated transmissions. The TRP of each DCI can be indicated in the form of a TCI status or resources used for repeated transmissions, and a more detailed description will be given in the embodiments described later. Alternatively, in Figure 11 The sDCI described herein can be used to schedule repeated transmissions, and each of the normal DCI and sDCI can correspond to a different TRP's PDSCH to participate in repeated transmissions. The above indication method can generally be applied to repeated transmissions over multiple TRPs and different data transmissions over multiple TRPs.

[0295] The following embodiments are written under the assumption that each cell, TRP, panel, or beam is distinguished by TCI status, but can be applied without limitation under this scenario. That is, when each cell, TRP, panel, or beam is distinguished based on different types of indexes or information, the TCI status described below can be understood as different types of indexes or information. Furthermore, the following embodiments can be applied without being limited to methods of distinguishing each cell, TRP, panel, or beam.

[0296] Furthermore, although the following embodiments have been described for the case where the base station sends downlink data, the content of the following embodiments can also be applied when the UE sends uplink data.

[0297] <First Embodiment>

[0298] Figure 14 This is an illustration of a PDSCH resource mapping method in a wireless communication system according to a first embodiment of the present disclosure during repeated transmissions using multiple TRPs.

[0299] Example 1400 shows a base station repeatedly transmitting the same PDSCH from different TRPs using a single DCI 1405. TRP 1 transmits PDSCH 1410 to the UE using the first four OFDM symbols, and TRP 2 repeatedly transmits the same PDSCH 1415 to the UE using the next four OFDM symbols. After receiving the two PDSCHs, the UE can improve reception reliability by combining them. The DCI can be transmitted to the UE from either TRP 1 or TRP 2, and as described above with reference to Figure 13, the DCI information includes information about the repeated transmission of PDSCHs across different TRPs. Specifically, the time and frequency resource information included in a single DCI can be indicated for each TCI state, or the time and frequency resource information common to each TCI state can be included in a single DCI. Optionally, a single DCI includes information indicating entries for time and frequency resource information configured via higher-layer signaling to indicate the time and frequency resource information for each TCI state.

[0300] The repeated transmission of the same PDSCH at 1400 is merely an example, and repeated transmissions of PDSCH can be performed using different OFDM symbols within one or different time slots. Furthermore, a single PDSCH can be transmitted across different time slots. This can be achieved using symbols as described above. Figure 10 The same symbols based on the same time slot, as described above, or in Figures 13 to 14, are used. Figure 14 The different symbols within (or between) time slots described in the document support repeated transmission of the same PDSCH based on a single DCI and multiple TRPs. This transmission can be configured by a higher signal or an L1 signal.

[0301] As mentioned above Figure 9 As described in, Figure 14 There may also be situations where specific resource areas are not used for PDSCH transmissions scheduled by higher signals or L1 signals, and the PDSCH mapping assumed by the base station and UE can be determined by at least one of the following three methods.

[0302] Method 1: Method 1 is to use the above text... Figure 9 The RB-symbol level rate matching mode or RE-level rate matching mode described herein is applied to all repeated PDSCH transmissions sent through different TRPs.

[0303] As an example, in the case of repeated transmission of the same PDSCH from different TRPs, such as 1400, 1420 illustrates an example where a specific resource area 1435, indicated by the rate matching indicator field included in a single DCI 1425, is not used for repeated transmissions 1430 and 1432 of the same PDSCH from TRP 1 and TRP 2. Alternatively, the UE can determine that a specific resource area 1435 is not used for repeated transmissions 1430 and 1432 of the same PDSCH from TRP 1 and TRP 2 when the base station informs the UE in advance via a higher signal that resource area 1435 is not used for PDSCH transmission. Although the method of applying the rate matching mode in repeated PDSCH transmissions has been described considering the case of repeated transmission of the same PDSCH, it is fully applicable to the case of transmission of different PDSCHs other than the same PDSCH.

[0304] Even if the TRPs that repeatedly transmit PDSCH are physically located in different places, overlapping time and frequency resource areas can be used. Therefore, it may be advantageous to apply the rate matching mode to all TRPs in accordance with Method 1 in order to minimize interference to UEs that use LTE or other NR services for other purposes.

[0305] Method 2: Method 2 is to combine the above text... Figure 9 The RB-symbol rate matching mode or RE-level rate matching mode described herein is applied in a limited way to PDSCHs sent from a specific TRP in repeated PDSCH transmissions sent through different TRPs.

[0306] For example, in the case of repeatedly transmitting the same PDSCH from different TRPs (such as 1400), although the base station notifies the UE that specific resource areas 1454 and 1456 are not used for PDSCH transmission by including the rate matching indicator field in a single DCI 1445 transmitted from TRP 1, in actual PDSCH transmission, 1440 shows that only the specific resource area 1454 that overlaps with the resource area of ​​the PDSCH transmitted in TRP 1 is not used for PDSCH 1450 transmission, while another specific resource area 1456 that overlaps with the transmitted PDSCH 1452 is used for PDSCH transmission in TRP 2.

[0307] Alternatively, in a single DCI 1445 where there is no rate matching indicator field, but specific resource areas 1454 and 1456 are configured as rate-matched resources through a higher signal configuration associated with TRP 1, the overlapping PDSCH resource areas are not used for PDSCH transmission when the PDSCH overlaps with specific resource areas 1454 and 1456, which are only used for PDSCH transmission from TRP 1. In other words, for PDSCH transmission in TRPs other than TRP 1, the specific resource areas are used for PDSCH transmission even if the PDSCH overlaps with specific resource areas 1454 and 1456.

[0308] The advantage of Method 2 is that the rate matching mode can be restricted to PDSCH sent by a specific TRP, so as to minimize interference to UEs using LTE or other NR services only in the TRP's location.

[0309] When considering Method 2 from the perspective of TCI status, if the TCI status of the PDCCH to which the DCI 1445 of the scheduled (or including the rate matching indicator field) PDSCH belongs is the same as the TCI status of the corresponding PDSCH 1450, then the UE determines that the resource area in the DCI indicated by the rate matching information (information that a specific resource area is not used for PDSCH transmission and reception) 1454 is not used for PDSCH 1450 transmission. If the TCI status of the PDCCH to which the DCI 1445 of the scheduled (or including the rate matching indicator field) PDSCH belongs is different from the TCI status of the corresponding PDSCH 1452, then the UE determines that the resource area 1456 in the DCI indicated by the rate matching information is used for PDSCH 1452 transmission.

[0310] Alternatively, if a rate-matching resource area configured with a higher-layer signal is associated with one or more specific TCI state values, the UE determines, based on the higher-layer signal information, whether the TCI state of the PDSCH scheduled by the DCI (without checking the TCI state information of the received PDCCH to which the DCI belongs) is the same as (or belongs to) or different from (or does not belong to) the TCI state of the rate-matching information configured via the higher-layer signal. If the TCI states are the same, the UE does not use the rate-matching resources in the scheduled PDSCH resource area for PDSCH reception. If the TCI states are different, the UE uses the rate-matching resources in the scheduled PDSCH resource area for PDSCH reception.

[0311] The TCI state associated with a DCI is determined by the TCI state in the CORESET higher signaling information of the PDCCH to which the DCI belongs, as shown in Table 4. The TCI state associated with a PDSCH is determined by the Transmission Configuration Indication field in the DCI used to schedule the PDSCH. In the case of repeated PDSCH transmissions by a single DCI, one or more values ​​of different TCI states for each repeated PDSCH transmission are determined by the Transmission Configuration Indication field. For example, when the Transmission Configuration Indication field is 3 bits, a total of 8 indices can indicate different TCI states, and a specific index among the 8 indices can indicate two or more TCI states. Table 17 below illustrates this example.

[0312] [Table 17]

[0313] TCI Index TCI State Set 1 TCI Status ID 1 2 TCI Status ID 1, TCI Status ID 4 3 TCI Status ID 5, TCI Status ID 10 4 TCI Status ID 5, TCI Status ID 2 ... ...

[0314] For example, in Table 17, when the DCI field TCI index indicates 2, it is assumed that the UE determines to perform repeated PDSCH transmission / reception, and transmits the first PDSCH based on TCI state ID 1 and the second PDSCH based on TCI state ID 4.

[0315] In Table 17, the TCI state set is determined by the RRC higher signal and / or the MAC higher signal. The size of the TCI state ID set for a specific row can be the number of repeated PDSCH transmissions, and the order of the TCI state IDs can be the TCI state values ​​of the repeatedly transmitted PDSCHs (Method A). Alternatively, the TCI state of repeatedly transmitted PDSCHs in ascending or descending order can be determined regardless of the order of the TCI state IDs (Method B). For example, in Table 17, two PDSCHs are repeatedly transmitted and received in the row corresponding to TCI index 4. According to Method A, the first PDSCH follows TCI state ID 5, and the second PDSCH follows TCI state ID 2. According to Method B, the first PDSCH can follow TCI state ID 2, and the second PDSCH can follow TCI state ID 5. Alternatively, the number of PDSCH repeated transmissions depends on the higher-layer signaling, and the TCI state IDs in the TCI state set can be repeated and applied to the repeated PDSCH transmissions. The specific meaning of a PDSCH conforming to TCI state ID X means that the PDSCHDMRS port of a serving cell is QCLed in terms of the RS and QCL parameters of TCI state ID X. The above description is not limited to method 2, but can be generally applied to this disclosure.

[0316] Method 3: Method 3 is a combination of Method 1 and Method 2, in which there are two types of specific resource areas (rate matching resources) that are not used for the transmission and reception of PDSCH. The first type is a rate matching resource that is universally applied to all TCI states (or all TRPs) (type A RM resources), and the second type is a rate matching resource that is limited to specific TCI states (or specific TRPs) (type B RM resources).

[0317] The base station can indicate Type A and Type B RM resources via a higher signal, or dynamically notify whether Type A and Type B RM resources are used for PDSCH transmission / reception via an L1 signal (DCI) after configuring the higher signal. When configured only by the higher signal, the UE applies Method 1 or Method 2 to the resource for which it performs repeated PDSCH transmission / reception (or single transmission / reception) based on whether the resource type is Type A or Type B, according to the rate matching. That is, if the resource is a Type A RM resource, the UE executes Method 1, and if the resource is a Type B RM resource, it executes Method 2. When indicated by both the higher signal and the L1 signal, the UE ultimately applies Method 1 or Method 2 based on whether the resource type is Type A or Type B, according to the rate matching indicated by the L1 signal. That is, if the resource is Type A, the UE executes Method 1, and if the resource is Type B, it executes Method 2.

[0318] When the base station repeatedly transmits PDSCH in multiple TRPs using methods 1 to 3 described above, the base station uses a higher signal or L1 signal to notify the UE whether a specific resource area is used for PDSCH transmission, and the UE performs PDSCH reception accordingly. Specifically, the base station and the UE can transmit and receive data through at least one of the following methods.

[0319] Case 1: As an example, one of the above methods is specified in the 3GPP standard, and the base station and UE always perform the above operations.

[0320] Scenario 2: The base station notifies the UE of at least one of methods 1 to 3 using a higher signal, and the UE follows the method configured via the higher signal. As an example, a specific method is always applied to PDSCH scheduled by the fallback DCI format because PDSCH scheduled by the fallback DCI format is unaffected by changes in the higher signal configuration, and the method indicated by the higher signal configuration is applied to PDSCH scheduled by the non-fallback DCI format. Alternatively, the base station notifies the UE whether a specific method is applied when configuring the CORESET or search space higher signal. Furthermore, the UE determines which method to apply based on the CORESET or search space configuration of the DCI that includes the PDSCH scheduling. Alternatively, after configuring the method specified or defaulted in the 3GPP standard, or after configuring the method for each RNTI as a higher signal, the method specified or configured according to the RNTI scrambled in the CRC of the DCI can be applied to PDSCH scheduled by the DCI.

[0321] Case 3: Fields indicating the use (or selection or non-selection) of a specific method are included in the DCI, enabling the base station and UE to perform PDSCH transmission / reception based on the corresponding information.

[0322] Case 4: As mentioned above (refer to the previous text) Figure 9 The rate matching information is mainly divided into information configured only with a higher signal and information dynamically selected by the DCI field after configuration with a higher signal. Therefore, the UE uses method 1 for rate matching mode information configured only with a higher signal and method 2 for rate matching information that can be selected by both the higher signal and the DCI.

[0323] Case 5: The method for repeated transmission of the same TBP DSCH sent by a single DCI in multiple TRPs can be a Time Division Multiplexing (TDM) scheme with different time resources for the PDSCH, an FDM scheme with different frequency resources for the PDSCH, or each PDSCH having the same time and frequency resources but at different layers. In this case, if the PDSCH sent by a single DCI in multiple TRPs has the same time and frequency resources, method 1 can be applied; and if the time or frequency resources are different, method 2 can be applied.

[0324] Applying this method to PDSCH means that the UE and base station determine whether to use rate matching information for PDSCH transmission and reception based on the aforementioned method. Figure 14 This section primarily describes the method for applying rate matching mode when a single DCI transmits and receives repeated transmissions of the same PDSCH through different symbols within a time slot. The same method can be applied when transmitting / receiving repeated transmissions of the same PDSCH to / from another layer using the same time and / or frequency resources.

[0325] Figure 15 This is a diagram illustrating the operation of a UE performing the first embodiment. According to... Figure 15 The UE receives repeated PDSCH transmission configuration information and / or rate matching resource configuration information via higher-layer signaling. Additionally, it can also receive configuration information regarding the TCI status and PDCCH-related configuration information via higher-layer signaling 1500. The UE receives a single DCI for cooperative communication 1510. A single DCI can be determined for cooperative communication using the methods described above, and can have, as an example, [details omitted]. Figure 12 The structure of situation #4 described in the text.

[0326] The UE identifies the resource 1520 through which it receives downlink data. Specifically, the UE can identify the resource scheduling PDSCH (downlink data) for each TCI state using a single DCI, and can identify the resource performing PDSCH rate matching among the resources scheduling PDSCH based on rate matching information determined by higher-layer signaling and / or information using one of the above methods (such as rate matching indicators and / or TCI states included in a single DCI). The UE identifies that the downlink data is received from a resource other than the resource performing rate matching among the resources scheduling PDSCH. Thereafter, the UE receives downlink data 1530 from the resource that transmitted the identified downlink data. Each of the above steps can be omitted, and the order can be changed and performed.

[0327] Figure 16 This is an illustration showing the operation of a base station performing the first embodiment. According to... Figure 16 The base station sends repeated PDSCH transmission configuration information and / or rate matching resource configuration information via higher-layer signaling. Additionally, it can also send configuration information regarding TCI status and PDCCH-related configuration information 1600 via higher-layer signaling. The base station can identify resources for transmitting downlink data 1610 and generate a single DCI for cooperative communication based on the identification result. In this case, the single DCI may include information indicating resources for scheduling PDSCH (downlink data) and may include rate matching indicators and / or TCI status information based on the identification result. The base station sends the single DCI 1620. For example, the single DCI may have... Figure 12 The structure described in scenario #4 is as follows. Subsequently, the base station transmits downlink data 1630 from the resource for transmitting downlink data. Each of the above steps can be omitted, and the order can be changed and performed.

[0328] <Second Embodiment>

[0329] Figure 17This is an illustration of a PDSCH resource mapping method in a wireless communication system according to a first embodiment of the present disclosure during repeated transmissions using multiple TRPs.

[0330] Figure 1700 illustrates an example of a UE receiving multiple DCIs and repeatedly receiving the same PDSCH from different TRPs. Specifically, the UE receives a scheduled PDSCH 1710 consisting of four OFDM symbols via DCI 1703 received from TRP 1, and subsequently receives a scheduled PDSCH 1715 consisting of four OFDM symbols via DCI 1705 received from TRP 2. Although the two PDSCHs are scheduled by different DCIs, they carry the same TB. It is also possible for the two PDSCHs to have different TBs (i.e., different PDSCHs). After receiving two PDSCHs, the UE can improve reception reliability by combining them in the case of the same TB. Unlike repeated PDSCH transmissions via multiple TRPs based on a single DCI, in Figure 17 In this context, the TRP for sending DCI and the TRP for sending PDSCH scheduled by DCI can be the same. However, with Figure 12 Similar to case #3, the following situation cannot be ruled out: an nDCI and / or sDCI is scheduled to send a PDSCH in a different TRP than the TRP that sent the DCI.

[0331] The method for determining whether PDSCH 1710 and 1715 scheduled in different DCIs 1703 and 1705 have the same TB or different TBs is as follows: When two DCIs have the same HARQ procedure number and NDI value, the UE determines that the two PDSCHs have the same TB. If at least one of them has a different value, the UE determines that the two PDSCHs have different TBs. The HARQ procedure number and NDI are merely examples and can be substituted and applied to the above DCI fields, such as the time resource allocation field or the frequency resource allocation field.

[0332] As another example, when the time and frequency resource domains of the PDSCHs indicated by two DCIs overlap completely or partially, the UE can determine that the TBs included in the scheduled PDSCHs are the same TBs. As another example, when two DCIs indicate the same counter DAI or total DAI value, the UE can determine that the TBs included in the scheduled PDSCHs are the same TBs. The above operations are specified in the standard and are always applied, or may be applied in a limited manner, only when activated by a specific UE capability report or higher signal configuration.

[0333] The repeated transmission of the same PDSCH at 1700 is merely an example, and repeated transmissions of PDSCH can be performed using different OFDM symbols within one or different time slots. Furthermore, a single PDSCH can be transmitted across different time slots. This can be achieved using symbols as described above. Figure 10 The same symbols based on the same time slot, as described above, or in Figures 13 to 14, are used. Figure 15 The different symbols within (or between) time slots described herein support repeated transmission of the same PDSCH based on multiple TRPs using multiple DCIs. This transmission can be configured by either a higher signal or an L1 signal.

[0334] As mentioned above Figure 9 As described in, Figure 17 There may also be situations where specific resource areas are not used for PDSCH transmissions scheduled by higher signals or L1 signals, and the PDSCH mapping assumed by the base station and UE can be determined by at least one of the following four methods.

[0335] Method 1: Method 1 is to use the above text... Figure 9 The RB-symbol level rate matching mode or RE level rate matching mode described herein is applied to all repeated PDSCH transmissions sent through different TRPs. That is, the characteristic of method 1 is that the rate matching information corresponding to a specific TRP or the rate matching information indicated by the DCI sent in a specific TRP is also applied to the PDSCH transmitted in another TRP.

[0336] As an example, in the case of repeated transmission of the same PDSCH from different TRPs, such as 1700, 1720 illustrates an example where a specific resource area 1735, indicated by the rate matching indicator field of DCI 1723 transmitted and received in TRP 1, is not used for repeated transmissions of the same PDSCH 1730 and 1732. Alternatively, when the base station notifies the UE in advance via a higher signal that resource area 1735 is not used for PDSCH transmission, the UE can determine that a specific resource area 1735 is not used for repeated transmissions of the same PDSCH 1730 and 1732. Although the method of applying the rate matching mode in repeated PDSCH transmissions has been described considering the case of repeated transmission of the same PDSCH, it is fully applicable to the transmission of different PDSCHs other than the same PDSCH.

[0337] Furthermore, example 1720 is an example where only one DCI 1723 indicates a rate-matched resource that includes rate-matching indicator information. If other DCIs 1725 also include rate-matching indicator information, the UE determines that the combined resources indicated by the rate-matching indicator information sent from different DCIs 1723 and 1725 are not used for PDSCH transmissions 1730 and 1732.

[0338] That is, regardless of whether the TCI state of the PDCCH to which DCI 1723, which includes the rate matching indicator field, belongs is the same as or different from the TCI state of PDSCH 1730 and 1732, the UE determines that the specific resource area 1735 indicated by the rate matching indicator that overlaps with PDSCH 1730 and 1732 is not used for PDSCH 1730 and 1732.

[0339] Even if the TRPs that repeatedly transmit PDSCH are physically located in different places, they can use the same time and frequency resource areas. Therefore, it may be advantageous to apply the rate matching mode to all TRPs in accordance with Method 1 in order to minimize interference to UEs that use LTE or other NR services for other purposes.

[0340] Method 2: Method 2 is to combine the above text... Figure 9 The RB-symbol rate matching mode or RE-level rate matching mode described herein are applied in a limited manner to PDSCHs transmitted from a specific TRP in repeated PDSCH transmissions transmitted through different TRPs. That is, method 2 is characterized in that the rate matching information corresponding to a specific TRP or the rate matching information indicated by the DCI transmitted in a specific TRP is also applied in a limited manner to PDSCHs transmitted only in a specific TRP.

[0341] In cases such as 1700 where the same PDSCH is repeatedly transmitted from different TRPs by DCIs 1743 and 1745, although the base station notifies the UE that specific resource areas 1754 and 1756 are not used for PDSCH transmission through the rate matching indicator field included in DCI 1743 transmitted from TRP 1, in actual PDSCH transmission, 1740 shows that only the specific resource area 1754, which overlaps with the resource area of ​​the PDSCH transmitted in TRP 1, is not used for PDSCH 1750 transmission, while another specific resource area 1756, which overlaps with the transmitted PDSCH 1752, is used for PDSCH transmission in TRP 2.

[0342] Alternatively, in DCI 1743, where a rate matching indicator field is absent, but specific resource areas 1754 and 1756 are provided through a higher signal configuration associated with TRP 1, the overlapping PDSCH resource areas are not used for PDSCH transmission when they overlap with specific resource areas 1754 and 1756, which are only used for PDSCH transmission from TRP 1. In other words, for PDSCH transmission in TRPs other than TRP 1, the specific resource areas are used for PDSCH transmission even if they overlap with specific resource areas 1754 and 1756.

[0343] The advantage of Method 2 is that the rate matching mode can be restricted to PDSCH sent by a specific TRP, so as to minimize interference to UEs using LTE or other NR services only in the TRP's location.

[0344] When considering Method 2 from the perspective of TCI status, if the TCI status of the PDCCH to which DCI 1743, including the rate matching indicator field, belongs is the same as the TCI status of the corresponding PDSCH 1750, then the UE determines that the resource area in the DCI indicated by the rate matching information (information that a specific resource area is not used for PDSCH transmission and reception) 1754 is not used for PDSCH 1750 transmission. If the TCI status of the PDCCH to which DCI 1743, including the rate matching indicator field, belongs is different from the TCI status of the corresponding PDSCH 1752, then the UE determines that the resource area 1756 in the DCI indicated by the rate matching information is used for PDSCH 1752 transmission.

[0345] Alternatively, if a rate matching resource area configured with a higher-layer signal is associated with one or more specific TCI state values, the UE determines, based on the higher-layer signal information, whether the TCI state of the PDSCH scheduled by the DCI (without checking the TCI state information of the received PDCCH to which the DCI belongs) is the same as (or belongs to) or different from (or does not belong to) the TCI state of the rate matching information configured via the higher-layer signal. If the TCI states are the same, the UE does not use the rate matching resources in the scheduled PDSCH resource area for PDSCH reception. If the TCI states are different, the UE uses the rate matching resources in the scheduled PDSCH resource area for PDSCH reception.

[0346] The TCI state associated with a DCI is determined by the TCI state in the CORESET higher signaling information of the PDCCH to which the DCI belongs, as shown in Table 4. The TCI state associated with a PDSCH is determined by the Transmission Configuration Indicator field in the DCI used to schedule the PDSCH. When repeated PDSCH transmissions in multiple TRPs are scheduled by a single DCI, one or more values ​​of the different TCI states for each repeated PDSCH transmission are determined by the Transmission Configuration Indicator field. For example, when the Transmission Configuration Indicator field is 3 bits, a total of 8 indices can indicate different TCI states, and a specific index among the 8 indices can indicate two or more TCI states.

[0347] Method 3: Method 3 is largely similar to Method 1, but with the following differences. The similarity between Method 3 and Method 1 is that, in the example of 1720, the specific resource area 1735 is not used for PDSCH transmission. The base station maps data information to scheduled PDSCH resource areas 1730 and 1732, which include the specific resource area, and then disables the specific resource area 1735 and transmits the scheduled PDSCH resource areas. In the case of Method 1, the specific resource area 1735, indicated by the "rate matching indicator" field, is not used for PDSCH 1730 and 1732 transmission. This means that when the base station sends PDSCH to the UE, downlink data is mapped to available resources other than the corresponding resource area.

[0348] The reason for using this method is that, according to Method 1, when the UE loses (or can be understood as not receiving or failing to decode) one of the two DCIs, the base station and the UE have different understandings of the PDSCH mapping method. When the UE receives DCI 1725 for scheduling PDSCH 1732 and does not receive DCI 1723 including the rate matching indicator field, the UE determines that it will map the data to the scheduled PDSCH 1732 and attempt to receive the PDSCH in the absence of specific resource area 1735 information indicated by the rate matching indicator field. On the other hand, the base station will transmit the data by mapping it to the remaining scheduled PDSCH 1732 resource area other than the specific resource area 1735 indicated by the rate matching indicator field. Therefore, due to the different understandings of transmission and reception by the base station and the UE, the UE will be unable to demodulate / decode PDSCH 1732.

[0349] To mitigate the problem, although the base station does not perform data transmission in specific resource area 1735, if the base station assumes that data has been transmitted and uses a frequency priority mapping method (i.e., base station execution fails), then even if the UE determines that it has received up to PDSCH in specific resource area 1735, data decoding may succeed if the corresponding portion is small in the entire scheduling area. This is illustratively shown in 1760. When the UE receives a scheduled PDSCH and information that specific resource area 1766 is not used for the corresponding PDSCH transmission, method 1 maps the data outside of area 1766 sequentially as in 1764, and in method 3, as in 1762, the base station mapping includes information corresponding to area 1766, but performs actual transmission outside of 1766.

[0350] Method 4: Method 4 is a combination of Method 1 (or Method 3) and Method 2, in which there are two types of specific resource areas (rate matching resources) that are not used for the transmission and reception of PDSCH. The first type is a rate matching resource that is universally applied to all TCI states (or all TRPs) (Type A RM resource), and the second type is a rate matching resource that is limited to specific TCI states (or specific TRPs) (Type B RM resource).

[0351] The base station can indicate Type A and Type B RM resources via a higher signal, or dynamically notify whether Type A and Type B RM resources are used for PDSCH transmission / reception via an L1 signal (DCI) after configuring the higher signal. When configured only by the higher signal, the UE applies Method 1 (or Method 3) or Method 2 to the resource for which it performs repeated PDSCH transmission / reception (or single transmission / reception) based on whether the resource type is Type A or Type B. That is, if the resource is a Type A RM resource, the UE executes Method 1 (or Method 3), and if the resource is a Type B RM resource, it executes Method 2. When indicated by both the higher signal and the L1 signal, the UE ultimately applies Method 1 (or Method 3) or Method 2 based on whether the resource type is Type A or Type B according to the rate indicated by the L1 signal. That is, if the resource is Type A, the UE executes Method 1 (or Method 3), and if the resource is Type B, it executes Method 2.

[0352] When a base station repeatedly transmits PDSCH in multiple TRPs using methods 1, 2, 3, or 4 described above, the base station uses a higher signal or L1 signal to notify the UE whether a specific resource area is used for PDSCH transmission, and the UE performs PDSCH reception accordingly. Specifically, the base station and the UE can transmit and receive data through at least one of the following methods.

[0353] Case 1: As an example, one of the above methods is specified in the 3GPP standard, and the base station and UE always perform the above operations.

[0354] Scenario 2: The base station notifies the UE of at least one of methods 1 to 4 using a higher signal, and the UE follows the method configured via the higher signal. As an example, a specific method is always applied to PDSCH scheduled by the fallback DCI format because PDSCH scheduled by the fallback DCI format is unaffected by changes in the higher signal configuration, and one of methods 1, 2, 3, or 4 as indicated by the higher signal configuration is applied to PDSCH scheduled by the non-fallback DCI format. Alternatively, the base station notifies the UE whether a specific method is applied when configuring the CORESET or search space higher signal. Furthermore, the UE determines which method to apply based on the CORESET or search space configuration of the DCI that includes the PDSCH scheduling. Alternatively, after a method specified or configured by default in the 3GPP standard, or after a higher signal configuration for each RNTI, a method specified or configured based on the RNTI scrambled in the CRC of the DCI can be applied to PDSCH scheduled by the DCI.

[0355] Case 3: Fields indicating the use (or selection or non-selection) of a specific method are included in the DCI, enabling the base station and UE to perform PDSCH transmission / reception based on the corresponding information.

[0356] Case 4: As mentioned above (refer to the previous text) Figure 9 The rate matching information is mainly divided into information configured only with a higher signal and information dynamically selected by the DCI field after configuration with a higher signal. Therefore, the UE uses method 1 (or method 3) for rate matching mode information configured only with a higher signal, and method 2 for rate matching information that can be selected by both the higher signal and the DCI.

[0357] Case 5: The method for repeated transmission of the same TBP DSCH sent in multiple TRPs can be a TDM scheme with different time resources for the PDSCH, an FDM scheme with different frequency resources for the PDSCH, or each PDSCH having the same time and frequency resources but different layers. In this case, if the PDSCHs sent in multiple TRPs have the same time and frequency resources, method 1 (or method 3) can be applied, and if the time or frequency resources are different, method 2 can be applied.

[0358] Applying this method to PDSCH means that the UE and base station determine whether to use rate matching information for PDSCH transmission and reception based on the aforementioned method. Figure 17 This section primarily describes the method of applying rate matching mode when multiple DCIs transmit and receive repeated transmissions of the same PDSCH through different symbols within a time slot. The same method can be applied when transmitting / receiving repeated transmissions of the same PDSCH to / from another layer using the same time and / or frequency resources.

[0359] Figure 18 This is an illustration showing the operation of a UE performing the second embodiment. According to... Figure 18 The UE receives repeated PDSCH transmission configuration information and / or rate matching resource configuration information via higher-layer signaling. Additionally, it can also receive configuration information regarding the TCI status and PDCCH-related configuration information via higher-layer signaling 1800. The UE receives multiple DCIs for cooperative communication 1510. Multiple DCIs can be determined for cooperative communication using the methods described above, and can have... Figure 12 The structure of cases #1 to #3 described in the text.

[0360] The UE identifies the resource 1820 through which it receives downlink data. Specifically, the UE can identify the resource scheduling PDSCH (downlink data) for each TCI state using a single DCI, and can identify the resource performing PDSCH rate matching among the resources scheduling PDSCH based on rate matching information determined by higher-layer signaling and / or information such as rate matching indicators and / or TCI states included in a single DCI, using one of the methods described above. The UE identifies that the downlink data is received from a resource other than the resource performing rate matching among the resources scheduling PDSCH. Thereafter, the UE receives downlink data 1830 from the resource that transmitted the identified downlink data. Each of the above steps can be omitted, and the order can be changed and performed.

[0361] Figure 19 This is an illustration showing the operation of a base station performing the second embodiment. According to... Figure 19 The base station sends repeated PDSCH transmission configuration information and / or rate matching resource configuration information via higher-layer signaling. Additionally, it can also send configuration information regarding TCI status and PDCCH-related configuration information 1900 via higher-layer signaling. The base station can identify resources for transmitting downlink data 1910 and generate one or more DCIs for cooperative communication based on the identification results. In this case, the one or more DCIs may include information indicating resources for scheduling PDSCH (downlink data) and may include rate matching indicators and / or TCI status information based on the identification results. The base station sends one or more DCIs 1920. The one or more DCIs may have... Figure 12 The structure of nDCI or sDCI is shown in one of the scenarios #1 to #3 described in the text. Afterwards, the base station transmits downlink data 1930 from the resource for transmitting downlink data. Any of the above steps can be omitted, and the order can be changed and performed.

[0362] Figure 20This is a diagram illustrating the structure of a UE in a wireless communication system according to an embodiment of the present disclosure.

[0363] refer to Figure 20 The UE may include a transceiver 2000, a memory 2005, and a processor 2010. The transceiver 2000 and processor 2010 of the UE can operate according to the communication method of the UE described above. However, the components of the UE are not limited to the examples described above. For example, the UE may include more or fewer components than those described above. Furthermore, the transceiver 2000, memory 2005, and processor 2010 may be implemented as a single chip.

[0364] Transceiver 2000 can transmit signals to / receive signals from a base station. The signals may include control information and data. For this purpose, transceiver 2000 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplification and down-converting the received signal. However, this is only one embodiment of transceiver 2000, and the components of transceiver 2000 are not limited to the RF transmitter and RF receiver.

[0365] In addition, the transceiver 2000 can receive signals via a wireless channel and output the signals to the processor 2010, and transmit signals output from the processor 2010 via a wireless channel.

[0366] The memory 2005 can store programs and data necessary for the operation of the UE. Furthermore, the memory 2005 can store control information or data included in signals sent and received by the UE. The memory 2005 can be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Moreover, there can be multiple memories 2005.

[0367] Furthermore, the processor 2010 can control a series of processes that enable the UE to operate according to the above embodiments. For example, the processor 2010 can receive a DCI consisting of two layers and control the UE's components to simultaneously receive multiple PDSCHs. There can be multiple processors 2010, and each processor 2010 can perform UE component control operations by executing programs stored in the memory 2005.

[0368] Figure 21 This is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0369] refer to Figure 21The base station may include a transceiver 2100, a memory 2105, and a processor 2110. The transceiver 2100 and processor 2110 of the base station can operate according to the communication method of the base station described above. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than those described above. Furthermore, the transceiver 2100, memory 2105, and processor 2110 may be implemented as a single chip.

[0370] Transceiver 2100 can send signals to / receive signals from the UE. Signals may include control information and data. For this purpose, transceiver 2100 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplification and down-converting the received signal. However, this is only one embodiment of transceiver 2100, and the components of transceiver 2100 are not limited to the RF transmitter and RF receiver.

[0371] In addition, transceiver 2100 can receive signals via a wireless channel and output the signals to processor 2110, and transmit signals output from processor 2110 via a wireless channel.

[0372] The memory 2105 can store programs and data necessary for the operation of the base station. Furthermore, the memory 2105 can store control information or data included in signals transmitted and received by the base station. The memory 2105 can be configured as a storage medium or a combination of storage media, such as ROM, RAM, hard disk, CD-ROM, and DVD. Moreover, there can be multiple memories 2105.

[0373] Processor 2110 can control a series of processes that enable the UE to operate according to the above embodiments. For example, processor 2110 can control each component of the base station to configure a two-layer DCI including allocation information of multiple PDSCHs and transmit the two-layer DCI. There can be multiple processors 2110, and processors 2110 can perform component control operations of the base station by executing programs stored in memory 2105.

[0374] The methods described in the claims or this disclosure can be implemented by hardware, software, or a combination of hardware and software.

[0375] When the method is implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors within an electronic device. At least one program may include instructions that cause the electronic device to perform the method as defined by the appended claims and / or as disclosed herein, according to various embodiments of this disclosure.

[0376] The program (software module or software) can be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage devices, compressed optical disc-ROM (CD-ROM), digital versatile optical disc (DVD), or other types of optical storage devices, or magnetic tape cassettes. Alternatively, any combination of some or all of these can form the memory storing the program. Furthermore, an electronic device may include multiple such memories.

[0377] Furthermore, the program can be stored in an attachable storage device that can be accessed by the electronic device via a communication network such as the Internet, intranet, local area network (LAN), wide area network (WLAN), and storage area network (SAN), or a combination thereof. Such a storage device can access the electronic device via an external port. Additionally, a separate storage device on a communication network can access the portable electronic device.

[0378] In the detailed embodiments described above, elements included in this disclosure are expressed in a singular or plural form according to the presented embodiments. However, for ease of description, the singular or plural form is suitably chosen for the presented situation, and this disclosure is not limited to elements expressed in a singular or plural form. Thus, an element expressed in a plural form may also include a single element, or an element expressed in a singular form may include multiple elements.

[0379] The embodiments described and illustrated in the specification and drawings are merely specific embodiments presented to facilitate explanation of the technical content of this disclosure and to aid in understanding it, and are not intended to limit the scope of this disclosure. That is, it will be apparent to those skilled in the art that other variations based on the technical concepts of this disclosure can be implemented. Furthermore, the corresponding embodiments described above can be combined if desired. For example, a portion of an embodiment of this disclosure can be combined with a portion of another embodiment to operate a base station and a terminal. As an example, a portion of Embodiment 1 of this disclosure can be combined with a portion of Embodiment 2 to operate a base station and a terminal. Moreover, although the above embodiments have been described based on an FDD LTE system, other variations based on the technical concepts of the embodiments can be implemented in other systems such as TDD LTE, 5G, or NR systems.

Claims

1. A method performed by a terminal in a communication system, the method comprising: The first rate matching resource information and the second rate matching resource information are received via higher-layer signaling. The first rate matching resource information and the second rate matching resource information are related to the cell-specific reference signal (CRS). as well as It is determined whether to execute the first scheme for rate matching or the second scheme for rate matching based on information received from the base station indicating that a first scheme for rate matching is to be executed. If the first scheme is determined to be implemented, a first physical downlink shared channel (PDSCH) or a second PDSCH is received, wherein the resources indicated by the first rate matching resource information are not used to receive the first PDSCH, and the resources indicated by the second rate matching resource information are not used to receive the second PDSCH; and If it is determined that the second scheme for rate matching is to be implemented, a PDSCH is received, wherein the resources indicated by the first rate matching resource information and the second rate matching resource information are not used to receive the PDSCH.

2. The method according to claim 1, wherein, The information indicating that the first scheme for rate matching will be executed is received via higher-layer signaling.

3. The method according to claim 1, wherein, The first PDSCH is associated with an index corresponding to a first transmit and receive point (TRP) configured via higher-layer signaling, and the second PDSCH is associated with an index corresponding to a second TRP configured via higher-layer signaling.

4. The method according to claim 1, wherein, Each of the first rate matching resource information and the second rate matching resource information includes at least one of the following: CRS v-offset value, number of CRS antenna ports, or frequency location information.

5. A method performed by a base station in a communication system, the method comprising: First rate matching resource information and second rate matching resource information are transmitted via higher-layer signaling. The first rate matching resource information and the second rate matching resource information are related to the cell-specific reference signal (CRS). Determine whether to execute the first scheme for rate matching or the second scheme for rate matching; When the first scheme for rate matching is executed: Send information indicating the first scheme for rate matching; and Transmitting a first Physical Downlink Shared Channel (PDSCH) in resources that do not include resources indicated by the first rate matching resource information, or transmitting a second PDSCH in resources that do not include resources indicated by the second rate matching resource information; and When the second scheme for rate matching is executed: PDSCH is sent in resources that do not include resources indicated by the first rate matching resource information and the second rate matching resource information.

6. The method according to claim 5, wherein, The information indicating that the first scheme for rate matching will be executed is sent via higher-layer signaling.

7. The method according to claim 5, wherein, The first PDSCH is associated with an index corresponding to a first transmit and receive point (TRP) sent via higher-layer signaling, and the second PDSCH is associated with an index corresponding to a second TRP sent via higher-layer signaling.

8. The method of claim 5, wherein each of the first rate matching resource information and the second rate matching resource information includes at least one of CRS v-offset value, number of CRS antenna ports, or frequency location information.

9. A terminal in a communication system, the terminal comprising: transceiver; as well as A controller connected to the transceiver is configured to: First rate matching resource information and second rate matching resource information are received via higher-layer signaling. The first rate matching resource information and the second rate matching resource information are related to the cell-specific reference signal (CRS). The determination is based on information received from the base station indicating whether a first scheme for rate matching will be executed, or a second scheme for rate matching will be executed. If the first scheme is determined to be implemented, a first physical downlink shared channel (PDSCH) or a second PDSCH is received, wherein the resources indicated by the first rate matching resource information are not used to receive the first PDSCH, and the resources indicated by the second rate matching resource information are not used to receive the second PDSCH. If it is determined that the second scheme for rate matching is to be implemented, a PDSCH is received, wherein the resources indicated by the first rate matching resource information and the second rate matching resource information are not used to receive the PDSCH.

10. The terminal according to claim 9, wherein, The information indicating that the first scheme for rate matching will be executed is received via higher-layer signaling.

11. The terminal according to claim 9, wherein, The first PDSCH is associated with an index corresponding to a first transmit and receive point (TRP) configured via higher-layer signaling, and the second PDSCH is associated with an index corresponding to a second TRP configured via higher-layer signaling.

12. The terminal according to claim 9, wherein, Each of the first rate matching resource information and the second rate matching resource information includes at least one of the following: CRS v-offset value, number of CRS antenna ports, or frequency location information.

13. A base station in a communication system, the base station comprising: transceiver; as well as A controller connected to the transceiver is configured to: First rate matching resource information and second rate matching resource information are transmitted via higher-layer signaling. The first rate matching resource information and the second rate matching resource information are related to the cell-specific reference signal (CRS). Determine whether to execute the first scheme for rate matching or the second scheme for rate matching. When the first scheme for rate matching is executed: Send information indicating the first scheme for rate matching, and Transmitting a first Physical Downlink Shared Channel (PDSCH) in resources that do not include the resources indicated by the first rate matching resource information, or transmitting a second PDSCH in resources that do not include the resources indicated by the second rate matching resource information, and When the second scheme for rate matching is executed: PDSCH is sent in resources that do not include resources indicated by the first rate matching resource information and the second rate matching resource information.

14. The base station according to claim 13, wherein, The information indicating that the first scheme for rate matching will be executed is sent via higher-layer signaling.

15. The base station according to claim 13, wherein, The first PDSCH is associated with an index corresponding to a first transmit and receive point (TRP) sent via higher-layer signaling, and the second PDSCH is associated with an index corresponding to a second TRP sent via higher-layer signaling.

16. The base station according to claim 13, wherein, Each of the first rate matching resource information and the second rate matching resource information includes at least one of the following: CRS v-offset value, number of CRS antenna ports, or frequency location information.

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