KR20220008701A - Method and apparatus for frequency domain resource allocation in wireless communication system - Google Patents

Abstract

The present invention relates to a 5G or 6G communication system for supporting a higher data rate after a 4G communication system such as LTE. Disclosed are a method and an apparatus for indicating a frequency resource or a format of the resource in a wireless communication system using a dual access scheme. The method and the apparatus of the present invention divide the frequency resource into a resource block set or a resource group unit, set at least one frequency resource format of a downlink, uplink, or flexible resource format for the resource group, change the set frequency resource format to a semi-static or dynamic frequency resource format, and effectively use frequency resources in uplink/downlink transmission and reception.

Description

Method and apparatus for allocating frequency resources in a wireless communication system

The present disclosure relates to a method and apparatus for setting a frequency resource for uplink or downlink transmission and reception in a wireless communication system.

Looking back on the progress of wireless communication generations, technologies for mainly human services such as voice, multimedia, and data have been developed. After the commercialization of the 5G (5th-generation) communication system, it is expected that connected devices, which are on an explosive increase, will be connected to the communication network. Examples of things connected to the network may include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve into various form factors such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6th-generation (6G) era, efforts are being made to develop an improved 6G communication system to provide various services by connecting hundreds of billions of devices and things. For this reason, the 6G communication system is called a system after 5G communication (beyond 5G).

In a 6G communication system that is predicted to be realized around 2030, the maximum transmission speed is tera (that is, 1,000 gigabytes) bps, and the wireless latency is 100 microseconds (μsec). That is, the transmission speed in the 6G communication system is 50 times faster than in the 5G communication system, and the wireless delay time is reduced by one-tenth.

In order to achieve such high data rates and ultra low latency, 6G communication systems use the terahertz band (for example, the 95 gigahertz (95 GHz) to 3 terahertz (3 THz) band). implementation is being considered. In the terahertz band, compared to the millimeter wave (mmWave) band introduced in 5G, the importance of technology that can guarantee the signal reach, that is, the coverage, is expected to increase due to more severe path loss and atmospheric absorption. As major technologies to ensure coverage, new waveforms, beamforming, and massive arrays that are superior in terms of coverage than radio frequency (RF) devices, antennas, orthogonal frequency division multiplexing (OFDM) Multi-antenna transmission technologies such as input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antennas, and large scale antennas must be developed. In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technology using orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS) are being discussed to improve the coverage of terahertz band signals.

In addition, in order to improve frequency efficiency and system network, in a 6G communication system, a full duplex technology in which uplink and downlink simultaneously use the same frequency resource at the same time, satellite and Network technology that integrates high-altitude platform stations (HAPS), etc., network structure innovation that supports mobile base stations, etc. and enables network operation optimization and automation, etc., and dynamic frequency sharing through collision avoidance based on spectrum usage prediction AI-based communication technology that realizes system optimization by utilizing (dynamic spectrum sharing) technology and artificial intelligence (AI) from the design stage and internalizing end-to-end AI support functions, The development of next-generation distributed computing technology that realizes complex services by utilizing ultra-high-performance communication and computing resources (mobile edge computing (MEC), cloud, etc.) is being developed. In addition, through the design of a new protocol to be used in the 6G communication system, the implementation of a hardware-based security environment, the development of mechanisms for the safe use of data, and the development of technologies for maintaining privacy, the connectivity between devices is further strengthened and the network is further enhanced. Attempts to optimize, promote the softwareization of network entities, and increase the openness of wireless communication continue.

Due to the research and development of this 6G communication system, the next hyper-connected experience (the next hyper-connected) through the hyper-connectivity of the 6G communication system, which includes not only the connection between objects but also the connection between people and objects. experience) is expected to become possible. Specifically, the 6G communication system is expected to provide services such as truly immersive extended reality ( truly immersive XR), high-fidelity mobile hologram, and digital replica. In addition, services such as remote surgery, industrial automation, and emergency response through security and reliability enhancement are provided through the 6G communication system, so it is applied in various fields such as industry, medical care, automobiles, and home appliances. will be

With the development of the mobile communication system as described above, various services can be provided and the need for a method for more efficiently allocating data channels for downlink and uplink emerges as wireless communication networks become more complex and diversified. did

The present disclosure provides a method and apparatus for efficiently setting and allocating frequency resources for uplink or downlink transmission/reception in a wireless communication system.

The present disclosure provides a method and apparatus for flexibly scheduling uplink and downlink transmission/reception in a frequency domain as well as a time domain.

A method for a UE in a wireless communication system to configure a frequency domain resource for uplink transmission or downlink reception according to an embodiment of the present disclosure includes checking a guard band configured within a bandwidth of a cell or a bandwidth part configured in the UE process; identifying one or more resource block sets in a resource region other than the guard band within the bandwidth or the bandwidth part; and confirming whether configuration information on the type of resource block set is provided, wherein when the configuration information is received, the type of each resource block set is a downlink resource block set based on the configuration information Recognition, uplink resource block set, or flexible resource block set is determined, and when the configuration information is not provided, whether the bandwidth or the bandwidth part is for the uplink transmission or for the downlink reception It may be determined whether the type of each resource block set is a downlink resource block set, an uplink resource block set, or a flexible resource block set.

In a method for a base station in a wireless communication system to configure a frequency domain resource for uplink transmission or downlink reception according to an embodiment of the present disclosure, a guard band is configured in the UE within a bandwidth of a cell or a bandwidth part configured in the UE. process; setting one or more resource block sets to the UE in a resource region other than the guard band within the bandwidth or the bandwidth part; and providing configuration information on the type of resource block set to the UE, wherein the configuration information includes whether the type of each resource block set is a downlink resource block set or an uplink resource block set; Alternatively, it may include information for determining whether it is a flexible resource block set.

1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure.
2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure.
3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure.
4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to an embodiment of the present disclosure.
5 is a diagram illustrating a frame, subframe, and slot structure of a 5G communication system.
6 is a diagram illustrating a basic structure of a time-frequency domain of a 5G communication system.
7 is a diagram illustrating a bandwidth part of a 5G communication system.
8 is a diagram illustrating an example of setting a control resource set for a downlink control channel of a 5G communication system.
9 is a diagram illustrating the structure of a downlink control channel of a 5G communication system.
10 is a diagram illustrating an example of uplink-downlink configuration in the time domain in a 5G communication system.
11 is a diagram illustrating an example of uplink-downlink configuration in a frequency domain in a 5G communication system.
12 is a diagram illustrating an example of guard band and resource block set configuration in a wireless communication system according to an embodiment of the present disclosure.
13 is a diagram illustrating an example of setting a frequency domain resource block set of a downlink bandwidth part in a wireless communication system according to an embodiment of the present disclosure.
14 is a diagram illustrating an example of setting a frequency domain resource block set of an uplink bandwidth part in a wireless communication system according to an embodiment of the present disclosure.
15 is a diagram illustrating an example of setting a frequency domain resource block set of a flexible bandwidth part in a wireless communication system according to an embodiment of the present disclosure.
16 is a diagram illustrating an example of time domain uplink and downlink configuration and frequency domain resource block set configuration in a wireless communication system according to an embodiment of the present disclosure.
17 is a flowchart illustrating that a terminal in a wireless communication system configures frequency domain resources for uplink transmission or downlink reception.
18 is a flowchart in which a base station in a wireless communication system configures frequency domain resources for uplink reception or downlink transmission.

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

In describing the present disclosure, descriptions of technical content that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring the gist of the present disclosure by omitting unnecessary description. In addition, the terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

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

Advantages and features of the present disclosure, and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present disclosure to be complete, and common knowledge in the art to which the present disclosure belongs It is provided to fully inform those who have the scope of the disclosure, and the present disclosure is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. In addition, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in the present disclosure, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Hereinafter, a base station (BS), as a subject performing resource allocation of a terminal, is gNode B, eNode B, Node B, (or xNode B (where x is an alphabet including g and e)), a radio access unit , a base station controller, a satellite, an airborn, or a node on a network. A user equipment (UE) may include a mobile station (MS), a vehicle, a satellite, an airborn, a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. can In the present disclosure, a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a terminal, and an uplink (UL) is a wireless transmission path of a signal transmitted from a terminal to a flag station. Additionally, there may be a sidelink (SL) indicating a wireless transmission path of a signal transmitted by the terminal to another terminal.

In addition, although LTE, LTE-A, or 5G systems may be described below as an example, embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, the embodiment of the present disclosure may also be applied to 5G-Advance or NR-Advance or 6G mobile communication technology (6G) developed after 5G mobile communication technology (or new radio, NR). It may be a concept including LTE, LTE-A and other similar services. In addition, the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by a person having skilled technical knowledge.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible that the instructions stored in the flow chart block(s) produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may be performed substantially simultaneously, or the blocks may sometimes be performed in the reverse order according to a corresponding function.

At this time, the term '~ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and '~ unit' performs certain roles do. However, '-part' is not limited to software or hardware. '~' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors. Thus, as an example, '~' refers to components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card. Also, in an embodiment, '~ unit' may include one or more processors.

A wireless communication system is a departure from providing an initial voice-oriented service, for example, 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE- Advanced (LTE-A), LTE-Pro, HRPD (High Rate Packet Data) of 3GPP2, UMB (Ultra Mobile Broadband), and IEEE 802.16e communication standards such as 802.16e provide high-speed, high-quality packet data service. It is developing into a broadband wireless communication system.

As a representative example of the broadband wireless communication system, in the LTE system, an Orthogonal Frequency Division Multiplexing (OFDM) scheme is employed in a Downlink (DL), and Single Carrier Frequency Division Multiple (SC-FDMA) is used in an Uplink (UL). Access) method is adopted. The uplink refers to a radio link through which the terminal transmits data or control signals to the base station, and the downlink refers to a radio link through which the base station transmits data or control signals to the user equipment. In the multiple access method as described above, the data or control information of each user can be divided by allocating and operating the time-frequency resources to which the data or control information is to be transmitted for each user so that they do not overlap each other, that is, orthogonality is established. can

As a future communication system after LTE, that is, the 5G communication system must be able to freely reflect various requirements of users and service providers, so services that simultaneously satisfy various requirements must be supported. Services considered for the 5G communication system include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), Ultra Reliability Low Latency Communication (URLLC), etc. There is this.

eMBB aims to provide more improved data transfer rates than the data transfer rates supported by existing LTE, LTE-A or LTE-Pro. For example, in the 5G communication system, the eMBB must be able to provide a maximum data rate of 20 Gbps in the downlink and a maximum data rate of 10 Gbps in the uplink from the viewpoint of one base station. In addition, the 5G communication system must provide the maximum transmission speed and, at the same time, provide the increased user perceived data rate of the terminal. In order to satisfy such a requirement, it is required to improve various transmission/reception technologies, including a more advanced multi-antenna (Multi Input Multi Output, MIMO) transmission technology. In addition, in the 2GHz band used by LTE, signals are transmitted using a transmission bandwidth of up to 20MHz, whereas the 5G communication system uses a frequency bandwidth wider than 20MHz in the frequency band of 3~6GHz or 6GHz or higher, so the data required by the 5G communication system The transmission speed can be satisfied.

In the 5G communication system, mMTC is being considered to support application services such as the Internet of Things (IoT). In order to efficiently provide the Internet of Things, mMTC requires large-scale terminal access support within a cell, improved terminal coverage, improved battery life, and reduced terminal cost. Since the Internet of Things is attached to various sensors and various devices to provide communication functions, it must be able to support a ^{large number of terminals (eg, 1,000,000 terminals/km 2 ) within a cell.} Since a terminal supporting mMTC is highly likely to be located in a shaded area that a cell cannot cover, such as the basement of a building, due to the nature of the service, it may require wider coverage compared to other services provided by the 5G communication system. A terminal supporting mMTC should be composed of a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.

URLLC is a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, remote control of a robot or machine, industrial automation, Unmaned Aerial Vehicle, remote health care, emergency situation A service used for an emergency alert, etc. may be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time have a requirement of a packet error rate of ^{10 -5 or less.} Therefore, for a service that supports URLLC, the 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is designed to allocate wide resources in the frequency band to secure the reliability of the communication link. items may be required.

The three services of 5G, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in one system. In this case, in order to satisfy different requirements of each service, different transmission/reception techniques and transmission/reception parameters may be used between services. Of course, 5G is not limited to the three services described above.

1 is a diagram illustrating a wireless communication system according to an embodiment of the present disclosure. 1 illustrates a base station 110 , a terminal 120 , and a terminal 130 as some of nodes using a wireless channel in a wireless communication system. 1 illustrates only one base station by way of example, one or more base stations identical to or similar to the base station 110 may be further included.

Referring to FIG. 1 , a base station 110 may be a network infrastructure that provides wireless access to terminals 120 and 130 . The base station 110 has a coverage defined as a predetermined geographic area based on an arrival distance capable of transmitting a radio signal. The base station 110 is an 'access point (AP)', 'eNodeB (eNB)', 'gNodeB (gNB)', '5G node (5th generation node)', 'wireless point', ' It may be referred to as a 'transmission/reception point (TRP)' or another term having an equivalent technical meaning.

Each of the terminal 120 and the terminal 130 is a device that can be used by a user, and can communicate with the base station 110 through a wireless channel. In some cases, at least one of the terminal 120 and the terminal 130 may be operated without the user's involvement. That is, at least one of the terminal 120 and the terminal 130 is a device that performs machine type communication (MTC) and may not be carried by the user. Each of the terminal 120 and the terminal 130 is a 'user equipment', a 'mobile station', a 'subscriber station', a 'remote terminal', a 'wireless terminal ( 'wireless terminal)', or 'user device' or other terms having an equivalent technical meaning.

The wireless communication environment may include wireless communication in a licensed band as well as an unlicensed band. The base station 110, the terminal 120, and the terminal 130 may transmit and receive radio signals in an unlicensed band (eg, 5 GHz to 7.125 GHz band, to 71 GHz band). As an embodiment, in the unlicensed band, a cellular communication system and another communication system (eg, a wireless local area network, WLAN) may coexist. In order to ensure fairness between two communication systems, that is, to prevent a situation in which a channel is used exclusively by one system, the base station 110, the terminal 120, and the terminal 130 are unlicensed bands. can perform a channel access procedure for As an example of the channel access procedure for the unlicensed band, the base station 110 , the terminal 120 , and the terminal 130 may perform a listen before talk (LBT).

The base station 110 , the terminal 120 , and the terminal 130 may transmit and receive radio signals in millimeter wave (mmWave) bands (eg, 28 GHz, 30 GHz, 38 GHz, and 60 GHz). In this case, in order to improve the channel gain, the base station 110 , the terminal 120 , and the terminal 130 may perform beamforming. Here, the beamforming may include transmit beamforming and/or receive beamforming. That is, the base station 110 , the terminal 120 , and the terminal 130 may impart directivity to a transmission signal or a reception signal. To this end, the base station 110 and the terminals 120 and 130 may select serving beams through a beam search or beam management procedure. After the serving beams are selected, communication between the base station 110 and the terminals 120 and 130 may be performed through a resource having a quasi co-located (QCL) relationship with the resource transmitting the serving beams.

The base station 110 may select a beam 112 or 113 in a specific direction. In addition, the base station 110 may communicate with the terminal using the beam 112 or 113 in a specific direction. For example, the base station 110 may receive a signal from the terminal 120 or transmit a signal to the terminal 120 using the beam 112 . In addition, the terminal 120 may receive a signal from the base station 110 or transmit a signal to the base station 110 using the beam 121 . Also, the base station 110 may receive a signal from the terminal 130 or transmit a signal to the terminal 130 using the beam 113 . In addition, the terminal 130 may receive a signal from the base station 110 or transmit a signal to the base station 110 using the beam 131 .

2 is a diagram illustrating a configuration of a base station in a wireless communication system according to an embodiment of the present disclosure. The configuration illustrated in FIG. 2 may be understood as a configuration of the base station 110 of FIG. 1 . Terms such as '~ unit' and '~ group' used below mean a unit that processes at least one function or operation, which may be implemented as hardware, software, or a combination of hardware and software.

Referring to FIG. 2 , the base station may include a wireless communication unit 210 , a backhaul communication unit 220 , a storage unit 230 , and a control unit 240 .

The wireless communication unit 210 (which may be used interchangeably with a transceiver) may perform functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 may perform a conversion function between a baseband signal and a bit stream according to a physical layer standard of a system. For example, when transmitting a signal, the wireless communication unit 210 may generate complex symbols by encoding and modulating the transmitted bit stream. Also, when receiving a signal, the wireless communication unit 210 may restore the transmitted bit stream through demodulation and decoding of the received baseband signal.

In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits it through the antenna, and downconverts the RF band signal received through the antenna into a baseband signal. It can be down-converted. To this end, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), and an analog to digital converter (ADC). Also, the wireless communication unit 210 may include a plurality of RF chains corresponding to a plurality of transmission/reception paths. Furthermore, the wireless communication unit 210 may include at least one antenna array including a plurality of antenna elements.

In terms of hardware, the wireless communication unit 210 may include a digital unit and an analog unit, and the analog unit includes a plurality of sub-units according to operating power, operating frequency, and the like. can be composed of The digital unit may be implemented by at least one processor (eg, a digital signal processor (DSP)).

The wireless communication unit 210 may transmit and receive signals as described above. Accordingly, all or part of the wireless communication unit 210 may be referred to as a 'transmitter', a 'receiver', or a 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel are used in the meaning of including processing as described above by the wireless communication unit 210 . According to an embodiment, the wireless communication unit 210 may include at least one transceiver.

The backhaul communication unit 220 may provide an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station to another node, for example, another access node, another base station, upper node, core network, etc. into a physical signal, and converts the physical signal received from the other node. It can be converted to a bit string.

The storage unit 230 may store data such as a basic program, an application program, and setting information for the operation of the base station. The storage unit 230 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 230 may provide stored data according to the request of the control unit 240 . In an embodiment, the storage 230 may include at least one memory.

The controller 240 may control overall operations of the base station. For example, the control unit 240 may transmit and receive a signal through the wireless communication unit 210 or through the backhaul communication unit 220 . In addition, the control unit 240 can write and read data in the storage unit 230 . In addition, the control unit 240 may perform functions of a protocol stack required by the communication standard. In an embodiment, the protocol stack may be included in the wireless communication unit 210 . In an embodiment, the controller 240 may include at least one processor.

The controller 240 may control the base station to perform operations according to at least one of various embodiments to be described later. For example, the controller 240 may perform a channel access procedure for the unlicensed band. For example, after receiving the signals transmitted in the unlicensed band from the transceiver (eg, the wireless communication unit 210), the control unit 240 pre-defines the strength of the above-described received signal, or uses the bandwidth as a factor. It is possible to determine whether the idle state of the unlicensed band by comparing the value of the function to the determined threshold value. Also, for example, the controller 240 may transmit a control signal to the terminal or receive a control signal from the terminal through the transceiver. Also, the controller 240 may transmit data to or receive data from the terminal through the transceiver. The controller 240 may determine a transmission result of a signal transmitted to the terminal based on a control signal or a data signal received from the terminal.

The controller 240 may configure one downlink control information (DCI) for allocating one or more data channels to one or more cells, and transmit the DCI to the terminal through the wireless communication unit 210 . Also, before transmission of the DCI, the controller 240 may provide configuration information necessary for allocating one or more data channels by one DCI to the terminal through higher layer signaling. Also, the controller 240 may transmit a data channel to or receive a data channel from the terminal based on the configuration information and information fields included in the DCI.

Also, for example, the control unit 240 is based on the transmission result, that is, based on the reception result of the terminal for the control signal or the data signal, the length of a contention window (CW) for the channel access procedure. may be maintained or changed (hereinafter, contention window adjustment). According to an embodiment, the controller 240 may determine a reference interval to obtain a transmission result for contention window adjustment. The control unit 240 may determine the data channel for contention section adjustment in the reference section The controller 240 may determine the reference control channel for the contention section adjustment in the reference section. If the unlicensed band is idle When it is determined to be, the controller 240 may occupy the channel.

In addition, the controller 240 receives uplink control information (UCI) from the terminal through the wireless communication unit 210 , and at least one hybrid automatic repeat request acknowledgment (HARQ-ACK) included in the above-described uplink control information. ) information and/or channel state information (Channel State Information, CSI) can be controlled to check whether retransmission is required for a downlink data channel and/or whether a modulation and coding method change is required. In addition, the controller 240 schedules initial or retransmission of downlink data or generates downlink control information for requesting transmission of uplink control information, and transmits the above-described downlink control information to the wireless communication unit 210 . It can be controlled to transmit to the terminal through the In addition, the control unit 240 may control the above-described wireless communication unit 210 to receive (re)transmitted uplink data and/or uplink control information according to the above-described downlink control information.

Although it has been described in FIG. 2 that each block performs a different function, this is only for technical convenience, and each function is not necessarily divided as described above. For example, the base station may include the control unit and the communication unit of FIG. 18 , and the communication unit may perform at least one function of the wireless communication unit 210 or the backhaul communication unit 220 .

3 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present disclosure. The configuration illustrated in FIG. 3 may be understood as a configuration of the terminal 120 or 130 of FIG. 1 . Terms such as '~ unit' and '~ group' used below mean a unit for processing at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

Referring to FIG. 3 , the terminal may include a wireless communication unit 310 , a storage unit 320 , and a control unit 330 .

The wireless communication unit 310 (which may be used interchangeably with a transceiver) may perform functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 310 may perform a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting a signal, the wireless communication unit 310 may generate complex symbols by encoding and modulating the transmitted bit stream. Also, when receiving a signal, the wireless communication unit 310 may restore the transmitted bit stream through demodulation and decoding of the received baseband signal. Also, the wireless communication unit 310 may up-convert the baseband signal to an RF band signal, transmit it through an antenna, and down-convert the RF band signal received through the antenna into a baseband signal. For example, the wireless communication unit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC.

Also, the wireless communication unit 310 may include a plurality of transmission/reception paths. Furthermore, the wireless communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the wireless communication unit 310 may include a digital unit and an analog unit (eg, a radio frequency integrated circuit (RFIC)). Here, the digital unit and the analog unit may be implemented as one package. In addition, the wireless communication unit 310 may include a plurality of RF chains. Furthermore, the wireless communication unit 310 may include at least one antenna array including a plurality of antenna elements to perform beamforming.

The wireless communication unit 310 may transmit and receive signals as described above. Accordingly, all or part of the wireless communication unit 310 may be referred to as a 'transmitter', 'receiver', or 'transceiver'. In addition, in the following description, transmission and reception performed through a wireless channel are used to include the processing as described above by the wireless communication unit 310 . According to an embodiment, the wireless communication unit 310 may include at least one transceiver.

The storage unit 320 may store data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 320 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 320 may provide stored data according to the request of the control unit 330 . According to an embodiment, the storage 320 may include at least one memory.

The controller 330 may control overall operations of the terminal. For example, the control unit 330 may transmit and receive signals through the wireless communication unit 310 . In addition, the control unit 330 writes and reads data in the storage unit 320 . And, the control unit 330 may perform the functions of the protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or microprocessor, or may be a part of the processor. According to an embodiment, the controller 330 may include at least one processor. Also, according to an embodiment, a part of the wireless communication unit 310 and/or the control unit 330 may be referred to as a communication processor (CP).

The controller 330 may control the terminal to perform operations according to at least one of various embodiments to be described later. For example, the control unit 330 may receive a downlink signal (downlink control signal or downlink data) transmitted from the base station through the transceiver (eg, the communication unit 310 ). Also, for example, the controller 330 may determine a transmission result for a downlink signal. The transmission result, as feedback on the transmitted downlink signal, may include ACKnowledgement (ACK), negative ACK (NACK), discontinuous transmission (DTX), and the like. In the present disclosure, the transmission result may be referred to by various terms, such as a reception state of a downlink signal, a reception result, a decoding result, and HARQ-ACK information. Also, for example, the controller 330 may transmit an uplink signal as a response signal to the downlink signal to the base station through the transceiver. The uplink signal may include a transmission result for the downlink signal explicitly (explicitly) or implicitly (implicitly). Also, for example, the control unit 330 includes, in the uplink control information, at least one or more of the above-described HARQ-ACK information and/or channel state information (CSI), the base station through the wireless communication unit 310 . uplink control information may be transmitted to In this case, the uplink control information may be transmitted through the uplink data channel together with the uplink data, or may be transmitted to the base station through the uplink data channel without the uplink data.

The controller 330 may perform a channel access procedure for the unlicensed band. For example, the wireless communication unit 310 receives signals transmitted in the unlicensed band, and the control unit 330 pre-defines the strength of the received signal, or the like, or determines a value of a function using the bandwidth as a factor. It is possible to determine whether the idle state of the above-described unlicensed band by comparing with. The controller 330 may perform an access procedure for the unlicensed band in order to transmit a signal to the base station. In addition, the controller 330 determines an uplink transmission resource for transmitting uplink control information by using at least one of the result of performing the above-described channel access procedure and the downlink control information received from the base station, and sends it to the base station through the transceiver. Uplink control information may be transmitted.

The control unit 330 receives, from the base station through the wireless communication unit 310, higher layer signaling including configuration information necessary to receive one downlink control information (DCI) configured to allocate one or more data channels to one or more cells. can The controller 330 also receives the DCI based on the configuration information and interprets fields included in the DCI. Also, the controller 330 may transmit a data channel to or receive a data channel from the base station based on the configuration information and information fields included in the DCI.

Although it has been described in FIG. 3 that each block performs a different function, this is only for technical convenience, and each function is not necessarily divided as described above. For example, the terminal may include a control unit and a communication unit of FIG. 17 .

4 is a diagram illustrating a configuration of a communication unit in a wireless communication system according to various embodiments of the present disclosure. FIG. 4 may show an example of a detailed configuration of the wireless communication unit 210 of FIG. 2 or the wireless communication unit 310 of FIG. 3 . Specifically, FIG. 4 is a part of the wireless communication unit 210 of FIG. 2 or the wireless communication unit 310 of FIG. 3 , and may illustrate components for performing beamforming.

Referring to FIG. 4 , the wireless communication unit 210 or the wireless communication unit 310 includes an encoding and modulation unit 402 , a digital beamforming unit 404 , a plurality of transmission paths 406-1 to 406-N, and analog It may include a beamformer 408 .

The encoder and modulator 402 may perform channel encoding. For channel encoding, at least one of a low density parity check (LDPC) code, a convolution code, and a polar code may be used. The encoder and modulator 402 may generate modulation symbols by performing constellation mapping on the coded bits.

The digital beamformer 404 may perform beamforming on a digital signal (eg, modulation symbols). To this end, the digital beamformer 404 may multiply the modulation symbols by beamforming weights. Here, the beamforming weights may be used to change the magnitude and phase of a signal, and may also be referred to as a 'precoding matrix', a 'precoder', or the like. The digital beamformer 404 may output digitally beamformed (ie, precoded) modulation symbols to the plurality of transmission paths 406 - 1 to 406 -N. In this case, according to a multiple input multiple output (MIMO) transmission technique, modulation symbols may be multiplexed or the same modulation symbols may be provided to a plurality of transmission paths 406-1 to 406-N.

The plurality of transmission paths 406 - 1 to 406 -N may convert digital beamformed digital signals into analog signals. To this end, each of the plurality of transmission paths 406 - 1 to 406 -N may include an inverse fast fourier transform (IFFT) calculator, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up converter. . The CP insertion unit is for an orthogonal frequency division multiplexing (OFDM) scheme, and may be excluded when another physical layer scheme (eg, filter bank multi-carrier, FBMC) is applied. The plurality of transmission paths 406 - 1 to 406 -N may provide an independent signal processing process for a plurality of streams generated through digital beamforming. Depending on the implementation, some of the components of the multiple transmission paths 406 - 1 to 406 -N may be used in common.

The analog beamformer 408 performs beamforming on the analog signals from the plurality of transmission paths 406-1 to 406-N, and at least one antenna array including a plurality of antenna elements. (antenna array) can be connected. To this end, the analog beamformer 408 may multiply the analog signals by beamforming weights. Here, the beamforming weights may be used to change the magnitude and phase of the signal. The analog beamformer 408 may be variously configured according to the plurality of transmission paths 406 - 1 to 406 -N and the connection structure between the antennas. For example, each of the plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array. As another example, a plurality of transmission paths 406 - 1 to 406 -N may be connected to one antenna array. As another example, the plurality of transmission paths 406 - 1 to 406 -N may be adaptively connected to one antenna array or connected to two or more antenna arrays.

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

5 is a diagram illustrating the structure of a frame, a subframe, and a slot of a 5G communication system.

)는 14일 수 있다. 이때, 1 서브프레임(501)당 슬롯의 개수(

)는 부반송파 간격(subcarrier spacing)에 대한 설정을 나타내는 값(numerology) μ(505, 506)에 따라 다를 수 있다. 예를 들어, μ=0인 경우, 1 서브프레임(501)은 하나의 슬롯(502)로 구성될 수 있으며, μ=1인 경우, 1 서브프레임(501)은 두개의 슬롯(503,504)으로 구성될 수 있다. 5 shows a case of μ = 0 (505) indicating a subcarrier spacing of 15 kHz and a case of μ = 1 (506) indicating a subcarrier spacing of 30 kHz, respectively, a frame (Frame, 500), a subframe (Subframe, 501), and an example of the structure of slots 502, 503, and 504 are shown. In the case of a 5G system as shown in FIG. 5 , one frame 500 may be defined as 10 ms. One subframe 501 may be defined as 1 ms, and thus, one frame 500 may consist of a total of 10 subframes 501 . One subframe 501 may consist of one or a plurality of slots. One slot may be configured or defined with 14 OFDM symbols. That is, the number of symbols per slot (

) may be 14. At this time, the number of slots per 1 subframe 501 (

) may vary according to a value (numerology) μ (505, 506) indicating a setting for subcarrier spacing. For example, when μ=0, one subframe 501 may consist of one slot 502, and when μ=1, one subframe 501 consists of two slots 503 and 504. can be

) 역시 달라질 수 있다. 각 부반송파 간격 설정 값 μ 및 μ에 따른

및

는 하기의 <표 1>과 같이 정의될 수 있다. μ=2의 경우, 단말은 기지국으로부터 상위 계층 시그널링을 통해 순환전치(cyclic prefix)에 관한 설정을 추가적으로 받을 수 있다.Since the number of slots per subframe may vary depending on the setting value μ for the subcarrier interval, the number of slots per frame (

) can also be different. According to each subcarrier spacing setting value μ and μ

and

may be defined as shown in Table 1 below. In the case of μ=2, the UE may additionally receive a configuration related to a cyclic prefix from the base station through higher layer signaling.

Cyclic prefix

0 15 Normal 14 10 One One 30 Normal 14 20 2 2 60 Normal, Extended 14 40 4 3 120 Normal 14 80 8 4 240 Normal 14 160 16

In the present disclosure, higher layer signaling (higher layer signaling) or higher layer signal (or higher signal, higher layer signal) is RRC (radio resource control) signaling, or PDCP (packet data convergence protocol) signaling, or MAC (Media access control) It may mean at least one of a control element (MAC control element, MAC CE). In addition, the higher layer signaling or the higher layer signal may include system information commonly transmitted to a plurality of terminals, for example, a system information block (SIB), and among information transmitted through a physical broadcast channel (PBCH), MIB ( Information (eg, PBCH payload) other than the master information block) may also be included in higher layer signaling or higher layer signaling. In this case, the MIB may also be expressed as being included in the above-described higher layer signaling or higher layer signal. FIG. 6 is a diagram illustrating a basic structure of a time-frequency domain of a 5G communication system. That is, FIG. 6 is a diagram illustrating a basic structure of a time-frequency domain, which is a radio resource region in which data or a control channel is transmitted in a 5G system.

(일례로 12)개의 연속된 RE들은 하나의 자원 블록(Resource Block, RB)(604)을 구성할 수 있다. 6 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. A basic unit of a resource in the time and frequency domain is a Resource Element (RE) 601, which corresponds to one Orthogonal Frequency Division Multiplexing (OFDM) symbol 602 in the time domain and one subcarrier in the frequency domain. It may be defined as corresponding to (Subcarrier) 603 . in the frequency domain

(for example, 12) consecutive REs may constitute one resource block (Resource Block, RB) 604 .

개의 부반송파와

개의 OFDM 심볼로 이루어진 하나의 자원 격자 (resource grid)는 상위 계층 시그널링을 통해 지시된 공통자원블록 (Common Resource Block, CRB)

에서부터 시작하는 것으로 정의 될 수 있으며, 주어진 안테나 포트, 부반송파 간격 설정 μ, 및 전송 방향 (예를 들어, 하향링크, 상향링크, 사이드링크(sidelink))에 대해 하나의 자원 격자가있을 수 있다.For each subcarrier spacing set value μ and carrier,

dog subcarriers

One resource grid consisting of OFDM symbols is a common resource block (CRB) indicated through higher layer signaling.

It can be defined as starting from , and there may be one resource grid for a given antenna port, subcarrier spacing setting μ, and transmission direction (eg, downlink, uplink, sidelink).

의 반송파 대역폭

및 시작 위치

를 상위 계층 시그널링 (예를 들어, 상위 계층 파라미터들 'carrierBandwidth' 및 'offsetToCarrier')을 통해 전달할 수 있다. 이때, 상기 반송파 대역폭

는 부반송파 간격 설정

에 대해 상위 계층 파라미터 'carrierBandwidth'에 의해 설정되고, 상기 시작 위치

는 Point A에 대한, 상기 반송파의 가용 가능한 자원 중 가장 낮은 주파수를 갖는 부반송파의 주파수 오프셋으로서, 'offsetToCarrier'로 설정되며 RB 개수로 표현될 수 있다. 이때,

및

가 부반송파 단위의 값인 것도 가능하다. 상기 파라미터들을 수신한 단말은

및

를 통해 반송파 대역폭의 시작 위치 및 크기를 알 수 있다.

및

를 전송하는 상위 계층 시그널링 정보의 일 예는 표 2와 같다.The base station sets the subcarrier interval for uplink and downlink to the terminal

of carrier bandwidth

and starting position

may be transmitted through higher layer signaling (eg, higher layer parameters 'carrierBandwidth' and 'offsetToCarrier'). In this case, the carrier bandwidth

set the subcarrier spacing

is set by the upper layer parameter 'carrierBandwidth' for

is a frequency offset of a subcarrier having the lowest frequency among the available resources of the carrier for Point A, is set as 'offsetToCarrier' and may be expressed as the number of RBs. At this time,

and

It is also possible that is a value in units of subcarriers. The terminal receiving the parameters

and

It is possible to know the starting position and size of the carrier bandwidth.

and

Table 2 shows an example of higher layer signaling information for transmitting .

<An example of upper layer signaling information element SCS-SpecificCarrier>

SCS-SpecificCarrier ::= SEQUENCE {
offsetToCarrier INTEGER (0..2199),
subcarrierSpacing SubcarrierSpacing,
carrierBandwidth INTEGER(1..maxNrofPhysicalResourceBlocks),
...,
[[
txDirectCurrentLocation INTEGER (0..4095) OPTIONAL -- Need S
]]
}

에 대해 공통자원블록의 부반송파 인덱스 0의 중심은 Point A와 일치한다. 주파수 도메인 공통자원블록 인덱스(

)와 부반송파 간격

의 RE는

의 관계를 갖는다. 여기서 k는 Point A를 기준으로 상대적으로 정의된 값이다. 즉, k=0은 Point A이다.Here, Point A is a value that provides a common reference point for a resource block grid. In the case of PCell downlink, the UE acquires Point A through the upper layer parameter 'offsetToPointA', and in all other cases, the radio frequency channel number absolute value set by the upper layer parameter 'absoluteFrequencyPointA' (Absolute Radio Frequency) Point A can be obtained through Channel Number, ARFCN). Here, 'offsetToPointA' is a frequency offset between Point A and the lowest subcarrier of the RB having the lowest frequency among RBs overlapping with the Synchronization Signal / Physical Broadcast CHannel (SS/PBCH) selected or used by the UE in the initial cell selection process by the UE. , expressed in units of RBs. The number or index of a common resource block (CRB) is increased by 1 in a direction from 0 to an increasing value in the frequency domain. In this case, the subcarrier spacing

For , the center of subcarrier index 0 of the common resource block coincides with Point A. Frequency domain common resource block index (

) and subcarrier spacing

RE of

have a relationship of Here, k is a relatively defined value with respect to Point A. That is, k=0 is Point A.

의 물리자원블록(Physical Resource Block, PRB)은 대역폭파트(Bandwidth Part: BWP) 내에서 0부터

까지의 번호 혹은 인덱스로 정의된다. 여기서

는 대역폭파트의 번호 또는 인덱스이다. 대역폭파트

내의 PRB (

)와 CRB(

) 간의 관계는

와 같다. 여기서,

는 CRB 0에서부터 대역폭파트

가 시작하는 첫 번째 RB까지의 CRB 개수이다.Subcarrier Spacing

The physical resource block (PRB) of the bandwidth part (BWP) from 0

It is defined as the number or index up to . here

is the number or index of the bandwidth part. bandwidth part

PRB within (

) and CRB(

) is the relationship between

same as here,

is the bandwidth part from CRB 0

It is the number of CRBs up to the first RB starting with .

<BWP>

Next, the bandwidth part setting in the 5G communication system will be described in detail with reference to the drawings.

7 is a diagram illustrating an example of setting a bandwidth part in a 5G communication system.

Referring to FIG. 7, a plurality of bandwidth parts within the carrier bandwidth or terminal bandwidth (UE bandwidth) 700, that is, bandwidth part #1 (BWP#1) 710, bandwidth part #2 (BWP#2) ( 750), and bandwidth part #3 (BWP#3) 790 may be set. Bandwidth part #3 790 occupies the entire UE bandwidth 700 . The bandwidth part #1 710 and the bandwidth part #2 750 may occupy the lower half and the upper half of the UE bandwidth 700 , respectively.

The base station may set one or a plurality of bandwidth parts in the uplink or downlink to the terminal, and one or more of the following higher layer parameters may be configured for each bandwidth part. In this case, the bandwidth part setting may be independent for uplink and downlink.

<An example of upper layer signaling information element BWP>

BWP ::= SEQUENCE {
bwp-Id BWP-Id,
locationAndBandwidth INTEGER (1..65536),
subcarrierSpacing ENUMERATED {n0, n1, n2, n3, n4, n5},
cyclicPrefix ENUMERATED { extended }
}

In Table 3, 'bwp-Id' means a bandwidth part identifier, 'locationAndBandwidth' indicates a frequency domain location and bandwidth of the bandwidth part, 'subcarrierSpacing' indicates a subcarrier interval used in the bandwidth part, and 'cyclicPrefix' ' indicates whether an extended cyclic prefix (CP) or a normal CP is used within the bandwidth part. In addition to the above parameters, various parameters related to the bandwidth part may be configured for the terminal. The parameters may be transmitted from the base station to the terminal through higher layer signaling, for example, RRC signaling. Within a given time, at least one bandwidth part among the set one or a plurality of bandwidth parts may be activated. The activation indication for the set bandwidth part is semi-statically transmitted from the base station to the terminal through RRC signaling or is dynamic through Downlink Control Information (DCI) used for scheduling of PDSCH (Physical Downlink Shared Channel) or PUSCH (Physical Uplink Shared Channel). can be transmitted to

According to an embodiment, the terminal before RRC connection may receive an initial bandwidth part (Initial BWP) for initial access from the base station through a master information block (MIB). More specifically, in the initial access stage, the UE receives configuration information on a Control Resource Set (CORESET) and a search space through which a Physical Downlink Control Channel (PDCCH) can be transmitted through the MIB. can do. In this case, the control resource set and the search space set by the MIB may be regarded as identifier (Identity, ID) 0, respectively. The base station may notify the terminal of at least one information of frequency allocation information, time allocation information, and Numerology for the control resource set #0 through the MIB. Here, the numerology may include at least one of a subcarrier interval and a CP. Here, CP may mean at least one of the length of the CP or information (eg, normal or extended) corresponding to the CP length.

In addition, the base station may notify the UE of configuration information on the monitoring period and the occasion for the control resource set #0, that is, configuration information on the search space #0 through the MIB. The UE may regard the frequency domain set as the control resource set #0 obtained from the MIB as an initial bandwidth part for initial access. In this case, the identifier (ID) of the initial bandwidth part may be regarded as 0.

The settings for the bandwidth part supported by the above-mentioned 5G may be used for various purposes.

* According to an embodiment, when the bandwidth supported by the terminal is smaller than the system bandwidth, data transmission/reception of the terminal for the system bandwidth may be supported through bandwidth part setting. For example, the base station may set the frequency domain location of the bandwidth part to the terminal so that the terminal transmits and receives data at a specific frequency location within the system bandwidth.

According to an embodiment, the base station may set a plurality of bandwidth parts to the terminal for the purpose of supporting different numerologies. For example, in order to support both data transmission and reception using a subcarrier interval of 15 kHz and a subcarrier interval of 30 kHz to a certain terminal, the base station may set two bandwidth portions to a subcarrier interval of 15 kHz and 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed, and when data is transmitted/received at a specific subcarrier interval, a bandwidth part set at the specific subcarrier interval may be activated.

According to an embodiment, for the purpose of reducing power consumption of the terminal, the base station may set bandwidth parts having bandwidths of different sizes to the terminal. For example, if the terminal supports a very large bandwidth, for example, a bandwidth of 100 MHz, but always transmits/receives data using the bandwidth, very large power consumption may occur. In particular, monitoring an unnecessary downlink control channel with a large bandwidth of 100 MHz in a situation in which there is no traffic may be very inefficient in terms of power consumption. For the purpose of reducing power consumption of the terminal, the base station may set a bandwidth part of a relatively small bandwidth to the terminal, for example, a bandwidth part of 20 MHz. In the absence of traffic, the UE may perform a monitoring operation in the 20 MHz bandwidth part, and when data is generated, it may transmit/receive data in the 100 MHz bandwidth part according to the instruction of the base station.

As described above, terminals before being RRC connected may receive configuration information for an initial bandwidth part through the MIB in the initial access stage. More specifically, the UE may receive a control resource set (CORESET) for the PDCCH from the MIB of the PBCH. The bandwidth of the control resource set set as the MIB may be regarded as an initial downlink bandwidth part, and through the initial bandwidth part, the UE may receive a Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted. Specifically, the UE detects the PDCCH on the search space and the control resource set in the initial bandwidth part set by the MIB, and the remaining system information (RMSI) or SIB1 (Remaining System Information) required for initial access through the PDSCH scheduled by the PDCCH. System Information Block 1) may be received, and configuration information regarding an uplink initial bandwidth part may be acquired through the SIB1 (or RMSI). The initial bandwidth part may be utilized for other system information (OSI), paging, and random access in addition to the purpose of receiving the SIB.

When one or more bandwidth parts are configured for the terminal, the base station may instruct the terminal to change the bandwidth part by using a bandwidth part indicator field in DCI.

For example, in FIG. 7 , when the currently activated bandwidth part of the terminal is the bandwidth part #1 710, the base station may instruct the terminal to use the bandwidth part indicator in the DCI to indicate the bandwidth part #2 750, and the terminal The bandwidth part change may be performed to the indicated bandwidth part #2 (750) based on the received bandwidth part indicator in the DCI.

As described above, since DCI-based bandwidth part change can be indicated by DCI scheduling PDSCH or PUSCH, when the UE receives a bandwidth part change request, the PDSCH or PUSCH scheduled by the DCI is unreasonable in the changed bandwidth part. It must be able to receive or transmit without To this end, the standard _{stipulates the requirements for the delay time (T BWP} ) required when changing the bandwidth part, and may be defined, for example, as shown in <Table 4> below.

NR Slot length (ms) BWP switch delay T _BWP (slots) Type 1 ^{Note 1} Type 2 ^{Note 1} 0 One One 3 One 0.5 2 5 2 0.25 3 9 3 0.125 6 17 Note 1: Depends on UE capability.
Note 2: If the BWP switch involves changing of SCS, the BWP switch delay is determined by the larger one between the SCS before BWP switch and the SCS after BWP switch.

The requirement for the bandwidth part change delay time supports type 1 or type 2 according to the capability of the terminal. The terminal may report the bandwidth part delay time type that can be supported to the base station. When the terminal receives the DCI including the bandwidth part change indicator in slot n according to the requirement for the bandwidth part change delay time described above, the terminal can complete the change to the new bandwidth part indicated by the bandwidth part change indicator at a _{time not later than the slot n+T BWP} , and transmit and receive the data channel scheduled by the DCI in the new bandwidth part changed. . When the base station intends to schedule the data channel with a new bandwidth part, the time domain resource allocation for the data channel may be determined in consideration _{of the bandwidth part change delay time (T BWP ) of the terminal.} That is, when scheduling a data channel with a new bandwidth part, the base station may schedule the data channel after a bandwidth part change delay time in a method of determining time domain resource allocation for the data channel. Accordingly, the UE may not expect that the DCI indicating the bandwidth part change indicates a slot offset (K0 or K2) smaller than the _{bandwidth part change delay time (T BWP ).}

If the terminal receives a DCI (eg, DCI format 1_1 or 0_1) indicating a bandwidth part change, the terminal receives the PDCCH including the DCI from the third symbol of the slot to the time domain resource allocation field in the DCI. No transmission or reception may be performed during a time period corresponding to the start symbol of the slot indicated by the indicated slot offset (K0 or K2). For example, if the terminal receives a DCI indicating a bandwidth part change in slot n, and the slot offset indicated by the DCI is K, the terminal starts from the third symbol of slot n to the symbol before slot n+K (ie, slot n). Up to the last symbol of +K-1), no transmission or reception may be performed.

Next, the SS/PBCH block in 5G will be described as follows.

The SS/PBCH block may mean a physical layer channel block composed of a primary SS (PSS), a secondary SS (SSS), and a PBCH. Specifically, it is as follows.

- PSS: A signal that serves as a reference for downlink time/frequency synchronization and provides some information on cell ID.

- SSS: serves as a reference for downlink time/frequency synchronization, and provides remaining cell ID information not provided by PSS. Additionally, it may serve as a reference signal (RS) for demodulation of the PBCH.

- PBCH: Provides essential system information necessary for transmitting and receiving data channel and control channel of the terminal. The essential system information may include search space-related control information indicating radio resource mapping information of a control channel or scheduling control information on a separate data channel for transmitting system information.

- SS/PBCH block: The SS/PBCH block consists of a combination of PSS, SSS, and PBCH. One or a plurality of SS/PBCH blocks may be transmitted within 5 ms, and each transmitted SS/PBCH block may be distinguished by an index.

The UE may detect the PSS and SSS in the initial access stage and may decode the PBCH. MIB can be obtained from the PBCH, and control resource set #0 (which may correspond to a control resource set having a control resource set index of 0) can be configured therefrom. The UE assumes that the selected SS/PBCH block (or the SS/PBCH block that has succeeded in PBCH decoding) and the DMRS (Demodulation Reference signal) transmitted in the control resource set #0 is QCL (Quasi Co Location), and is in the control resource set #0. monitoring can be performed. The terminal may acquire system information through downlink control information transmitted from the control resource set #0. The UE may obtain RACH (Random Access Channel) related configuration information required for initial access from the obtained system information. The UE may transmit a physical RACH (PRACH) to the base station in consideration of the selected SS/PBCH block index, and the base station receiving the PRACH may obtain the SS/PBCH block index selected by the UE. The base station can know that the terminal has selected a certain block from each of the SS/PBCH blocks and monitors the control resource set #0 associated therewith.

<DCI>

Next, downlink control information (DCI) in the 5G system will be described in detail as follows.

In the 5G system, scheduling information for uplink data (or PUSCH) or downlink data (or PDSCH) is transmitted from the base station to the terminal through DCI. The UE may monitor or attempt to detect at least one of a DCI format for fallback and a DCI format for non-fallback for PUSCH or PDSCH. The DCI format for countermeasures may consist of fields predefined between the base station and the terminal, and the non-prevention DCI format may include configurable fields.

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

For example, DCI scheduling PDSCH for system information (SI) may be scrambled with SI-RNTI. DCI scheduling a PDSCH for a random access response (RAR) message may be scrambled with an RA-RNTI. DCI scheduling a PDSCH for a paging message may be scrambled with a P-RNTI. DCI notifying SFI (Slot Format Indicator) may be scrambled with SFI-RNTI. DCI notifying Transmit Power Control (TPC) may be scrambled with TPC-RNTI. DCI for scheduling UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

DCI format 0_0 may be used as a fallback DCI for scheduling PUSCH, and in this case, CRC may be scrambled with at least one of C-RNTI, CS-RNTI, and MCS-C-RNTI. DCI format 0_0 having a CRC scrambled to at least one of C-RNTI, configured scheduling (CS)-RNTI, and modulation coding scheme (MCS)-C-RNTI may include, for example, at least one of the following information. can

- Control information format identifier (Identifier for DCI formats): an identifier for classifying DCI formats. For example, in the terminal receiving DCI through a 1-bit identifier, when the identifier value is 0, the DCI is a UL DCI format (eg, DCI format 0_1), and when it is 1, the DCI is a DL DCI format (e.g. For example, it can be distinguished as DCI format 1_0).

비트를 포함한다. 여기서 단말이 DCI 포맷 0_0을 공통 탐색 공간에서 모니터링 하는 경우,

는 초기 상향링크 대역폭파트의 크기이고, DCI 포맷 0_0을 단말 고유 탐색 공간에서 모니터링 하는 경우,

는 현재 활성화 되어 있는 상향링크 대역폭파트의 크기이다. 다시 말해, 대비책 DCI 포맷이 전송되는 탐색 공간에 따라 주파수 도메인 자원 할당 필드의 크기를 결정하는 대역폭파트가 다를 수 있다. - Frequency domain resource assignment: DCI format 0_0 supports only the resource allocation type 1 scheme and indicates RBs that are frequency domain resources allocated by the resource allocation type 1 scheme.

contains bits. Here, when the UE monitors DCI format 0_0 in the common search space,

is the size of the initial uplink bandwidth part, and when DCI format 0_0 is monitored in the UE-specific search space,

is the size of the currently active uplink bandwidth part. In other words, the bandwidth part that determines the size of the frequency domain resource allocation field may be different according to a search space in which the countermeasure DCI format is transmitted.

비트 중

개의 MSB(Most Significant Bit)는 주파수 오프셋을 지시하는데 사용될 수 있다. 여기서,

이면, 상위 계층 시그널링에 의해 두개의 오프셋들이 설정되어 있고,

이면, 상위 계층 시그널링에 의해 네 개의 오프셋들이 설정되어 있는 것을 의미하며,

비트가 하기의 자원 할당 타입 1에 따라 할당된 주파수 도메인 자원 영역을 지시한다.In one embodiment, when performing PUSCH hopping,

out of beat

MSB (Most Significant Bit) may be used to indicate a frequency offset. here,

If , two offsets are set by higher layer signaling,

If , it means that four offsets are set by higher layer signaling,

A bit indicates a frequency domain resource region allocated according to the following resource allocation type 1.

비트가 자원 할당 타입 1에 따라 할당된 주파수 도메인 자원 영역을 제공한다.According to an embodiment, when PUSCH hopping is not performed,

A bit provides a frequency domain resource region allocated according to resource allocation type 1.

- Time domain resource assignment: In 4 bits, it indicates a row index of a time domain resource assignment table including a PUSCH mapping type, a PUSCH transmission slot offset, a PUSCH start symbol, and the number of PUSCH transmission symbols. The time domain resource allocation table may be set by higher layer signaling or may be pre-configured between the base station and the terminal.

- Frequency hopping flag: 1 bit, indicates that PUSCH hopping is performed (enable) or PUSCH hopping is not performed (disable).

- Modulation and coding scheme (MCS): indicates the modulation and coding scheme used for data transmission.

- New data indicator (new data indicator, NDI): indicates whether HARQ initial transmission or retransmission.

- Redundancy version (RV): indicates a redundant version (redundancy version) of HARQ.

- HARQ process number (HARQ process number): indicates the process number of HARQ.

- TPC command: indicates a transmission power control command for the scheduled PUSCH.

- Padding bit: A field for matching the size (total number of bits) with other DCI formats (eg DCI format 1_0), and is inserted as 0 if necessary.

- UL/SUL indicator: 1 bit, if the cell has two or more ULs and the size of DCI format 0_0 before adding the padding bit is larger than the size of DCI format 1_0 before adding the padding bit, UL/SUL of 1 bit indicator, otherwise the UL/SUL indicator does not exist or is 0 bit. If the UL/SUL indicator is present, the UL/SUL indicator is located in the last bit of DCI format 0_0 after the padding bit.

-ChannelAccess-CPext: 2 bits, indicating a channel access type and a CP extension in a cell operating in an unlicensed band. In the case of a cell operating in a licensed band, it does not exist or is 0 bit.

For DCI formats other than DCI format 0_0, refer to the 3GPP standardization document.

<Time domain resource allocation>

Hereinafter, time domain resource allocation for a data channel in a 5G communication system is described.

The base station sets a table for time domain resource allocation for a downlink data channel (PDSCH) and an uplink data channel (PUSCH) to higher layer signaling (eg, RRC signaling) to the terminal, or <Table 5> As such, a table for time domain resource allocation predefined between the base station and the terminal may be used.

For example, in the case of fallback DCI, the UE uses a table defined in advance as shown in <Table 5>, and in the case of non-fallback DCI, the UE uses a table set through higher layer signaling can be used

Row index PUSCH mapping type K ₂ S L One Type A j 0 14 2 Type A j 0 12 3 Type A j 0 10 4 Type B j 2 10 5 Type B j 4 10 6 Type B j 4 8 7 Type B j 4 6 8 Type A j+1 0 14 9 Type A j+1 0 12 10 Type A j+1 0 10 11 Type A j+2 0 14 12 Type A j+2 0 12 13 Type A j+2 0 10 14 Type B j 8 6 15 Type A j+3 0 14 16 Type A j+3 0 10

In this case, for time domain resource allocation set through higher layer signaling, a table consisting of maxNrofDL-Allocations=16 entries for PDSCH may be set, and maxNrofUL-Allocations=16 entries for PUSCH. A table composed of (Entry) can be set. Each table includes, for example, PDCCH-to-PDSCH slot timing (corresponding to a time interval in slot units between a time when the PDCCH is received and a time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as _{K 0) or PDCCH} -to-PUSCH slot timing (corresponding to the time interval in slot units between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted _{, denoted as K 2} ), the PDSCH or PUSCH is scheduled in the slot A position (S) of a start symbol, a length (L) of an allocated symbol, a mapping type of a PDSCH or a PUSCH, etc. may be included. When higher layer signaling is used, for example, an information element as shown in Table 6 below may be notified from the base station to the terminal.

PDSCH-TimeDomainResourceAllocationList information element
PDSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofDL-Allocations)) OF PDSCH-TimeDomainResourceAllocation
PDSCH-TimeDomainResourceAllocation ::= SEQUENCE {
k0 INTEGER(0..32) OPTIONAL, -- Need S
mappingType ENUMERATED {typeA, typeB},
startSymbolAndLength INTEGER (0..127)
}
PUSCH-TimeDomainResourceAllocation information element
PUSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofUL-Allocations)) OF PUSCH-TimeDomainResourceAllocation

PUSCH-TimeDomainResourceAllocation ::= SEQUENCE {
k2 INTEGER(0..32) OPTIONAL, -- Need S
mappingType ENUMERATED {typeA, typeB},
startSymbolAndLength INTEGER (0..127)}

Here, 'k0' indicates PDCCH-to-PDSCH timing as an offset in units of slots, 'k2' indicates PDCCH-to-PUSCH timing as an offset in units of slots, and 'mappingType' indicates a mapping type of PDSCH or PUSCH and 'startSymbolAndLength' indicates the start symbol and length of the PDSCH or PUSCH. The base station may notify the terminal of one of the entries in the time domain resource allocation table through L1 signaling. For example, it may be indicated by a 'time domain resource allocation' field in DCI. The UE may acquire time domain resource allocation for PDSCH or PUSCH based on a field in DCI received from the base station.

<Frequency domain resource allocation>

Hereinafter, frequency domain resource allocation for a data channel in a 5G communication system is described.

As a method of indicating frequency domain resource allocation for a downlink data channel (PDSCH) and an uplink data channel (PUSCH), two types, ie, resource allocation type 0 and resource allocation type 1, are supported.

Resource allocation type 0 is a method of allocating resources in units of a resource block group (RBG) composed of consecutive P number of RBs, and may be notified from the base station to the terminal in the form of a bitmap. At this time, the RBG may be composed of a set of consecutive VRBs (Virtual RBs), and the RBG size P (Nominal RBG size P) is a value set by the upper layer parameter 'rbg-Size' and in Table 7 below. It may be determined based on the defined size value of the bandwidth part.

Bandwidth Part Size Configuration 1 Configuration 2 1 - 36 2 4 37 - 72 4 8 73 - 144 8 16 145 - 275 16 16

인 대역폭파트 i의 총 RBG의 수

는

이다. 여기서 첫번째 RBG의 크기는

이다. 마지막 RBG의 크기

는 만약

인 경우,

이고, 그렇지 않은 경우의

는

이다. 상기 외 다른 RBG의 크기는

이다.

비트 크기의 비트맵의 각 비트들은 각각의 RBG에 대응될 수 있다. RBG들은 대역폭파트의 가장 낮은 주파수 위치에서 시작하여 주파수가 증가하는 순서대로 인덱스가 부여될 수 있다. 대역폭파트 내의

개의 RBG들에 대하여, RBG#0에서부터 RBG#(

-1)이 RBG 비트맵의 MSB에서부터 LSB로 매핑될 수 있다. 단말은 비트맵 내의 특정 비트 값이 1일 경우, 해당 비트 값에 대응되는 RBG가 할당되었다고 판단할 수 있고, 비트맵 내의 특정 비트 값이 0일 경우, 해당 비트 값에 대응되는 RBG가 할당되지 않았다고 판단할 수 있다.자원 할당 타입 1은 연속적으로 할당된 VRB들에 대한 시작 위치 및 길이로 자원을 할당하는 방법으로 이 때, 연속적으로 할당된 VRB들에 대하여 인터리빙 또는 비인터리빙이 추가적으로 적용될 수 있다. 자원 할당 타입 1의 자원 할당 필드는 자원 지시자 값 (Resource Indication Value; RIV)으로 구성될 수 있으며, RIV는 VRB의 시작 지점 (

)과 연속적으로 할당된 RB의 길이 (

)로 구성될 수 있다.

는 자원 할당이 시작되는 첫 번째 PRB 인덱스이고,

는 할당된 연속적인 PRB 길이 혹은 개수일 수 있다. 보다 구체적으로,

크기의 대역폭파트 내의 RIV는 하기와 같이 정의될 수 있다.here the size

Total number of RBGs in bandwidth part i

Is

to be. Here, the size of the first RBG is

to be. size of last RBG

is if

If ,

and if not

Is

to be. The size of the RBG other than the above is

to be.

Each bit of the bit-sized bitmap may correspond to each RBG. RBGs may be assigned an index in the order of increasing frequency, starting from the lowest frequency position of the bandwidth part. within the bandwidth

For RBGs, from RBG#0 to RBG#(

-1) may be mapped from the MSB to the LSB of the RBG bitmap. When a specific bit value in the bitmap is 1, the UE can determine that the RBG corresponding to the bit value is allocated, and when the specific bit value in the bitmap is 0, the RBG corresponding to the bit value is not allocated. It can be determined. Resource allocation type 1 is a method of allocating resources by starting positions and lengths for consecutively allocated VRBs. In this case, interleaving or non-interleaving may be additionally applied to consecutively allocated VRBs. The resource allocation field of resource allocation type 1 may consist of a resource indicator value (RIV), and the RIV is the starting point of the VRB (

) and the length of consecutively allocated RBs (

) can be composed of

is the first PRB index from which resource allocation begins,

may be the allocated continuous PRB length or number. More specifically,

The RIV in the bandwidth part of the size may be defined as follows.

가 다를 수 있다. 예를 들어, 상향링크 전송을 설정 혹은 스케줄링하는 DCI(즉, 상향링크 그랜트(UL grant)) 중 대비책 DCI 포맷인 DCI 포맷 0_0이 공통 탐색 공간(common search space, CSS)에서 전송되는 경우,

로는 초기 상향링크 대역폭파트(initial bandwidth part) 크기,

또는

이 사용될 수 있다. 유사하게, 하향링크 수신을 설정 혹은 스케줄링하는 DCI 중 대비책 DCI 포맷인 DCI 포맷 1_0이 공통 탐색 공간(common search space, CSS)에서 전송되는 경우,

및 또는

는 셀에 제어자원세트#0이 설정되어 있는 경우에는 제어자원세트#0의 크기가 되고, 제어자원세트#0이 설정되어 있지 않은 경우 초기 하향링크 대역폭파트의 크기가 된다.At this time, according to the search space in which the countermeasure DCI format (eg, DCI format 0_0 or DCI format 1_0) is transmitted

may be different. For example, DCI format 0_0, which is a countermeasure DCI format among DCI (ie, uplink grant) for configuring or scheduling uplink transmission, is transmitted in a common search space (CSS),

As the initial uplink bandwidth part (initial bandwidth part) size,

or

this can be used Similarly, when DCI format 1_0, which is a countermeasure DCI format among DCIs for setting or scheduling downlink reception, is transmitted in a common search space (CSS),

and or

is the size of the control resource set #0 when the control resource set #0 is set in the cell, and is the size of the initial downlink bandwidth part when the control resource set #0 is not set in the cell.

크기의 다른 활성화 대역폭파트에 적용되는 경우, RIV는

및

에 대응되며, RIV는 다음과 같이 정의된다.In this case, when DCI format 0_0 or DCI format 1_0, which is a countermeasure DCI format, is transmitted in a UE-specific search space (USS), or the size of a countermeasure DCI format transmitted in a UE-specific search space is the initial uplink bandwidth It is determined through the size of the part or the initial downlink bandwidth part, but the DCI is

When applied to different active bandwidth parts of size, RIV is

and

, and RIV is defined as follows.

이면, K는 집합

중

를 만족하는 가장 큰 값이다. 그렇지 않으면 (

),

는 1이다. At this time, if

, then K is the set

middle

is the largest value that satisfies Otherwise (

),

is 1

The base station may set the resource allocation type through higher layer signaling to the terminal. For example, the upper layer parameter resourceAllocation may be set to one of resourceAllocationType0, resourceAllocationType1, or dynamicSwitch. If the UE is configured with both resource allocation types 0 and 1, or if the upper layer parameter resourceAllocation is set to dynamicSwitch, the MSB (Most Significant Bit) of the resource allocation field in the DCI format indicating scheduling is resource allocation type 0. Resource allocation Type 1 may be indicated, and resource allocation information may be indicated through bits other than the MSB of the resource allocation field based on the indicated resource allocation type, and the UE may interpret the resource allocation information of DCI based on this. have. If the terminal is configured with either resource allocation type 0 or resource allocation type 1, or if the upper layer parameter resourceAllocation is set to one of resourceAllocationType0 or resourceAllocationType1, the resource allocation field in the DCI format indicating scheduling is the set resource allocation type may indicate resource allocation information based on , and the UE may interpret resource allocation information of DCI based on the set resource allocation type.

<CORESET>

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

8 is a diagram illustrating an example of setting a control resource set of a downlink control channel of a 5G communication system. That is, FIG. 8 is a diagram illustrating an example of a control resource set (CORESET) through which a downlink control channel is transmitted in a 5G wireless communication system.

Referring to FIG. 8 , within a UE bandwidth part 810 in the frequency domain and one slot 820 in the time domain, two control resource sets, that is, control resource set #1 801 and control Resource set #2 (802) is set. The control resource sets 801 and 802 may be set in a specific frequency resource 803 in the terminal bandwidth part 810 in the frequency domain, and may be set in one or a plurality of OFDM symbols in the time domain. The OFDM symbols may be defined by a Control Resource Set Duration (804). Referring to the illustrated example, the control resource set #1 801 is set to a control resource set length of 2 symbols, and the control resource set #2 802 is set to a control resource set length of 1 symbol.

Each of the aforementioned control resource sets may be set by the base station to the terminal through at least one of higher layer signaling, for example, system information, master information block (MIB), and radio resource control (RRC) signaling. Setting the control resource set to the terminal means providing information such as a control resource set identifier (Identity), a frequency position of the control resource set, and a symbol length of the control resource set. For example, the higher layer signaling information element configuring the control resource set may include the information in Table 8 below.

ControlResourceSet ::= SEQUENCE {
controlResourceSetId ControlResourceSetId,
frequencyDomainResources BIT STRING (SIZE (45)),
duration INTEGER (1..maxCoReSetDuration),
cce-REG-MappingType CHOICE {
interleaved SEQUENCE {
reg-BundleSize ENUMERATED {n2, n3, n6},
interleaverSize ENUMERATED {n2, n3, n6},
shiftIndex INTEGER(0..maxNrofPhysicalResourceBlocks-1) OPTIONAL -- Need S
},
nonInterleaved NULL
},
precoderGranularity ENUMERATED {sameAsREG-bundle, allContiguousRBs},
tci-StatesPDCCH-ToAddList SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF TCI-StateId OPTIONAL, -- Cond NotSIB1-initialBWP
tci-StatesPDCCH-ToReleaseList SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF TCI-StateId OPTIONAL, -- Cond NotSIB1-initialBWP
tci-PresentInDCI ENUMERATED {enabled} OPTIONAL, -- Need S
pdcch-DMRS-ScramblingID INTEGER (0..65535) OPTIONAL, -- Need S
...,
[[
rb-Offset-r16 INTEGER (0..5) OPTIONAL, -- Need N
tci-PresentInDCI-ForDCI-Format1-2-r16 INTEGER (1..3) OPTIONAL, -- Need S
coresetPoolIndex-r16 INTEGER (0..1) OPTIONAL, -- Need R
controlResourceSetId-r16 ControlResourceSetId-r16 OPTIONAL -- Need S
]]
}

Here, 'controlResourceSetId' indicates a control resource set identifier (Identity), 'frequencyDomainResources' indicates a frequency domain resource, and 'duration' indicates a time interval of a control resource set, that is, a time domain resource, and 'cce-REG' -MappingType' indicates CCE-to-REG mapping method, 'reg-BundleSize' indicates REG bundle size, 'interleaverSize' indicates interleaver size, 'shiftIndex' indicates interleaver shift .In addition, tci-StatesPDCCH is configuration information of Transmission Configuration Indication (TCI) states, and one or more SS/PBCH block indexes in a Quasi Co Located (QCL) relationship with DMRS transmitted in a corresponding control resource set. Alternatively, it may include a Channel State Information Reference Signal (CSI-RS) index.

9 is a diagram illustrating the structure of a downlink control channel of a 5G communication system. That is, FIG. 9 is a diagram showing an example of a basic unit of time and frequency resources constituting a downlink control channel that can be used in a 5G wireless communication system.

Referring to FIG. 9 , a basic unit of time and frequency resources constituting a downlink control channel may be referred to as a resource element group (REG) 903, and the REG 903 is one OFDM symbol 901 and a frequency in the time domain. It may be defined as 1 PRB 902 as a domain, that is, 12 subcarriers. The base station may configure an allocation unit of a downlink control channel by concatenating at least one REG 903 .

When a basic unit to which a downlink control channel is allocated in 5G is referred to as a Control Channel Element (CCE) 904 , one CCE 904 may include a plurality of REGs 903 . When describing the illustrated REG 903 as an example, the REG 903 may be composed of 12 REs, and if 1 CCE 904 is composed of 6 REGs 903 , 1 CCE 904 is 72 REGs. It can consist of REs. A region in which a downlink control resource set is set may be composed of a plurality of CCEs 904, and a specific downlink control channel may have one or a plurality of CCEs 904 according to an Aggregation Level (AL) in the control resource set. can be mapped to The CCEs 904 in the control resource set are divided by numbers, and in this case, the numbers of the CCEs 904 may be assigned according to a logical mapping method.

The basic unit of the downlink control channel, that is, the REG 903 may include both a region of REs to which DCI is mapped and a region to which the DMRS 905 used for demodulating the DCI is mapped. At least one (three in the case of the example shown in FIG. 9 ) DMRS 905 may be transmitted within one REG 903 . The number of CCEs required to transmit the downlink control channel may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and the different number of CCEs is for link adaptation of the downlink control channel. can be used to implement For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The UE needs to detect a signal in the control resource set without knowing the existence of the downlink control channel. For this blind decoding, a search space representing a set of CCEs may be defined. The search space is a set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode on a given aggregation level, and various aggregations that make one bundle with 1, 2, 4, 8, 16 CCEs Since there is a level, the terminal may have a plurality of search spaces. A search space set may be defined as a set of search spaces in all set aggregation levels.

<Search Space>

The search space for the PDCCH can be classified into a common search space (CSS) and a UE-specific search space (USS). A certain group of UEs or all UEs access system information. A common search space can be searched to receive control information common to cells such as dynamic scheduling or paging message for a cell, for example, scheduling allocation information of a PDSCH for transmission of SIB including operator information of a cell is common It can be detected by examining the search space In the case of the common search space, it can be defined as a set of CCEs that are promised so that a certain group of terminals or all terminals can receive the PDCCH. Scheduling allocation information may be detected by examining the UE-specific search space, which may be UE-specifically defined as a function of the UE's identity and various system parameters.

In the 5G wireless communication system, the parameter for the search space of the PDCCH may be set from the base station to the terminal through higher layer signaling (eg, SIB, MIB, RRC signaling). For example, the base station is the number of PDCCH candidates in each aggregation level L, the monitoring period for the search space, the monitoring time (occasion) in units of symbols in the slot for the search space, the search space type (common search space or terminal-specific search) space), a combination of a DCI format and an RNTI to be monitored in the search space, and a control resource set index for monitoring the search space may be set to the UE. For example, the higher layer signaling information element for setting parameters for the search space of the PDCCH may include configuration information as shown in Table 9 below.

SearchSpace ::= SEQUENCE {
SearchSpace ::= SEQUENCE {
searchSpaceId SearchSpaceId,
controlResourceSetId ControlResourceSetId OPTIONAL, -- Cond SetupOnly
monitoringSlotPeriodicityAndOffset CHOICE {
…
} OPTIONAL, -- Cond Setup
duration INTEGER (2..2559) OPTIONAL, -- Need R
monitoringSymbolsWithinSlot BIT STRING (SIZE (14)) OPTIONAL, -- Cond Setup
nrofCandidates SEQUENCE {
aggregationLevel1 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel2 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel4 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel8 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},
aggregationLevel16 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}
} OPTIONAL, -- Cond Setup
searchSpaceType CHOICE {
common SEQUENCE {
…
},
ue-Specific SEQUENCE {
…
}
} OPTIONAL -- Cond Setup2
}

Here, 'searchSpaceId' indicates a search space identifier, 'controlResourceSetId' indicates a control resource set identifier, 'monitoringSlotPeriodicityAndOffset' indicates a monitoring slot level period, 'duration' indicates a length of a time interval to be monitored, 'monitoringSymbolsWithinSlot' indicates symbols for PDCCH monitoring in the slot, 'nrofCandidates' indicates the number of PDCCH candidates for each aggregation level, 'searchSpaceType' indicates a search space type, and 'common' indicates a common search space. parameters, and 'ue-Specific' includes parameters for a terminal-specific search space. According to the configuration information, the base station may configure one or a plurality of search space sets for the terminal. According to an embodiment, the base station may configure the search space set 1 and the search space set 2 to the terminal, and may configure the DCI format A scrambled with X-RNTI in the search space set 1 to be monitored in the common search space, and search DCI format B scrambled with Y-RNTI in space set 2 may be configured to be monitored in a UE-specific search space.

According to the configuration information, one or a plurality of search space sets may exist in a common search space or a terminal-specific search space. For example, the search space set #1 and the search space set #2 may be set as the common search space, and the search space set #3 and the search space set #4 may be set as the terminal-specific search space.

In the common search space, the following combinations of DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

- DCI format 2_0 with CRC scrambled by SFI-RNTI

- DCI format 2_1 with CRC scrambled by INT-RNTI

- DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

- DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

In the UE-specific search space, the following combinations of DCI format and RNTI may be monitored. Of course, it is not limited to the following examples.

- DCI format 0_0/1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

- DCI format 1_0/1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

The specified RNTIs may follow the definitions and uses below.

C-RNTI (Cell RNTI): UE-specific PDSCH scheduling purpose

TC-RNTI (Temporary Cell RNTI): UE-specific PDSCH scheduling purpose

CS-RNTI (Configured Scheduling RNTI): Semi-statically configured UE-specific PDSCH scheduling purpose

RA-RNTI (Random Access RNTI): Used for scheduling PDSCH in the random access phase

P-RNTI (Paging RNTI): PDSCH scheduling purpose for which paging is transmitted

SI-RNTI (System Information RNTI): Used for scheduling PDSCH in which system information is transmitted

INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is pucturing

TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Purpose of indicating power control command for PUSCH

TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control command for PUCCH

TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control command for SRS (Sounding reference signal)

The aforementioned DCI formats may follow the definitions shown in Table 10 below.

DCI format Usage 0_0 Scheduling of PUSCH in one cell 0_1 Scheduling of PUSCH in one cell 1_0 Scheduling of PDSCH in one cell 1_1 Scheduling of PDSCH in one cell 2_0 Notifying a group of UEs of the slot format 2_1 Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE 2_2 Transmission of TPC commands for PUCCH and PUSCH 2_3 Transmission of a group of TPC commands for SRS transmissions by one or more UEs

In a 5G communication system such as NR, a physical channel and a physical signal may be divided as follows. For example, an uplink/downlink physical channel means a set of REs that transmit information transmitted through a higher layer, and representatively PDCCH, PUCCH, PDSCH, PUSCH, etc. correspond. The uplink/downlink physical signal means a signal used in the physical layer without transferring information transmitted through the upper layer, and representative DM-RS, CSI-RS, SRS, etc. correspond. In the present disclosure, as described above, It can be expressed as a 'signal' without distinguishing between a physical channel and a physical signal. For example, expressing that the base station transmits a downlink signal may mean that the base station transmits at least one of a downlink physical channel and a downlink physical signal such as PDCCH, PDSCH, DM-RS, and CSI-RS. . In other words, a signal in the present disclosure is a term including at least one of the above-described channels and signals, and may be classified according to context and cases when the distinction is actually required.

<TCI state>

Hereinafter, a method of setting a TCI state for a PDCCH (or PDCCH DMRS) in a 5G communication system will be described in detail.

The TCI state is for announcing a QCL (Quasi co-location) relationship between the PDCCH (or PDCCH DMRS) and another RS (Reference Signal) or channel. Here, that the antenna port A (reference RS #A) of a certain reference signal and the antenna port B (target RS #B) of the target reference signal are QCLed to each other means that the terminal is estimated from the antenna port A It means that it is allowed to apply some or all of the channel related parameters to the channel measurement from the antenna port B. The parameters related to QCL are 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) RRM (radio resource management) affected by average gain, 4) spatial It may include at least one of BM (beam management) affected by the parameter, and it may be necessary to relate different parameters depending on the situation. As an example, NR may support four types of QCL relationships as shown in Table 11 below.

QCL type Large-scale characteristics A Doppler shift, Doppler spread, average delay, delay spread B Doppler shift, Doppler spread C Doppler shift, average delay D Spatial Rx parameters

Here, the spatial RX parameter includes various parameters such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit/receive channel correlation, transmit/receive beamforming, spatial channel correlation, etc. Some or all of them may be collectively referred to. The QCL relationship may be set to the UE through RRC signaling parameters TCI-State and QCL-Info as shown in Table 12 below. Referring to <Table 12>, the base station sets one or more TCI states to the terminal, and provides up to two QCL relationships (qcl-Type1, qcl-Type2) to the RS referring to the ID of the TCI state, that is, the target RS. can tell you Here, informing the maximum of two QCL relationships is only an example, and the base station may inform the UE of more than two QCL relationships with respect to the target RS. At this time, each QCL information (QCL-Info) included in each of the TCI state is a serving cell index and BWP index of the reference RS indicated by the QCL information, the type and ID of the reference RS, and the QCL type as shown in <Table 12> may include

TCI-State ::= SEQUENCE {
tci-StateId TCI-StateId,
qcl-Type1 QCL-Info,
qcl-Type2 QCL-Info OPTIONAL, -- Need R
...
}

QCL-Info ::= SEQUENCE {
cell ServCellIndex OPTIONAL, -- Need R
bwp-Id BWP-Id OPTIONAL, -- Cond CSI-RS-Indicated
referenceSignal CHOICE {
csi-rs NZP-CSI-RS-ResourceId,
ssb SSB-Index
},
qcl-Type ENUMERATED {typeA, typeB, typeC, typeD},
...
}

Here, 'tci-StateId' indicates the TCI state ID, 'qcl-Type1' includes QCL information of the first target RS (target RS) referring to the TCI state ID, and 'qcl-Type2' is the TCI state Includes QCL information of the second target RS (target RS) referring to the ID. For each QCL information, 'cell' indicates the serving cell index of the UE to which the RS indicated by the QCL information is set, 'bwp-Id' indicates the BWP index of the RS indicated by the QCL information, and 'csi-rs' Alternatively, 'ssb' indicates a CSI-RS ID or a synchronization signal/sequence block (SSB) ID indicated by the QCL information. The base station may communicate with the terminal using one or a plurality of beams. To this end, the base station may transmit information on N different beams to the terminal through N different TCI states. For example, when N=3, the base station is associated with CSI-RS or SSB corresponding to beams in which qcl-Type parameters (eg, qcl-Type2) included in three TCI states are different, and is QCL type D. By setting it, it is possible to notify the UE that the antenna ports referring to the different TCI states are associated with different spatial Rx parameters, that is, different beams. Specifically, an example of a TCI state combination applicable to the PDCCH DMRS antenna port is shown in Table 13 below. In <Table 13>, the fourth row is a combination assumed by the terminal before RRC configuration, and the row cannot be set for the terminal after RRC configuration.

Valid TCI
state configuration DL RS 1 qcl-Type1 DL RS 2
(if configured) qcl-Type2
(if configured) One TRS QCL-TypeA TRS QCL-TypeD 2 TRS QCL-TypeA CSI-RS (BM) QCL-TypeD 3 CSI-RS (CSI) QCL-TypeA 4 SS/PBCH Block QCL-TypeA SS/PBCH Block QCL-TypeD

슬롯 이후의 첫 번째 슬롯에서부터 상기 MAC CE 시그널링에 의해 지시되는 TCI state를 적용하고, 상기 TCI state를 포함하는 빔 정보를 기반으로 PDCCH를 수신할 수 있다. 여기서

는 부반송파 간격 μ에 대해 각 서브프레임에 포함된 슬롯의 수이다. 이때, PDCCH의 TCI state 지시를 위한 MAC CE는 2byte (16bits)로 구성되며, 5비트의 서빙 셀 ID 필드, 4비트의 CORESET ID 필드, 7비트의 TCI state ID 필드로 구성될 수 있다. 서빙 셀 ID 필드는 상기 MAC CE가 적용되는 서빙 셀의 ID를 지시하고, CORESET ID 필드는 MAC CE의 TCI state이 지시 또는 적용되는 CORESET의 ID를 지시할 수 있다. TCI state ID 필드는 CORESET ID 필드를 통해 식별된 CORESET에 적용되는 TCI state를 지시할 수 있다. 만약 CORESET ID가 0인 경우, TCI state ID 필드는 활성화 된 대역폭파트에 대한 상위 계층 시그널링인 'PDSCH-Config' 중 'tci-States-ToAddModList' 및 'tci-States-ToReleaseList'를 통해 설정된 TCI-state 중 첫 번째부터 64개의 TCI states 중 하나를 지시할 수 있다. 만약 CORESET ID가 0인 아닌 다른 값으로 설정되어 있는 경우, TCI state ID 필드는 상기 CORESET ID 필드가 지시하는 CORESET에 대한 상위 계층 시그널링인 'tci-StatesPDCCH-ToAddList' 및 'tci-StatesPDCCH-ToReleaseList'를 통해 설정된 TCI-state 중 하나를 지시할 수 있다.The base station supports hierarchical signaling for dynamic TCI state allocation for the PDCCH beam to the terminal. Specifically, the base station may set N TCI states (TCI#0, TCI#1, ..., TCI #M-1) to the terminal through RRC signaling, and some of them may be set as the TCI state for CORESET. can Thereafter, the base station may instruct and activate one of the TCI states for CORESET to the terminal through MAC CE signaling (eg, a MAC CE activation command for providing the TCI state of CORESET). Upon receiving the MAC CE signaling, the terminal transmits HARQ-ACK information for the PDSCH providing the MAC CE signaling from a slot (eg, slot k).

The TCI state indicated by the MAC CE signaling may be applied from the first slot after the slot, and the PDCCH may be received based on beam information including the TCI state. here

is the number of slots included in each subframe for the subcarrier interval μ. In this case, the MAC CE for the TCI state indication of the PDCCH is composed of 2 bytes (16 bits), and may be composed of a 5-bit serving cell ID field, a 4-bit CORESET ID field, and a 7-bit TCI state ID field. The serving cell ID field may indicate the ID of the serving cell to which the MAC CE is applied, and the CORESET ID field may indicate the ID of the CORESET to which the TCI state of the MAC CE is indicated or applied. The TCI state ID field may indicate the TCI state applied to the CORESET identified through the CORESET ID field. If the CORESET ID is 0, the TCI state ID field is the TCI-state set through 'tci-States-ToAddModList' and 'tci-States-ToReleaseList' among 'PDSCH-Config', which is higher layer signaling for the activated bandwidth part. One of 64 TCI states can be indicated from the first of If the CORESET ID is set to a value other than 0, the TCI state ID field includes 'tci-StatesPDCCH-ToAddList' and 'tci-StatesPDCCH-ToReleaseList', which are upper layer signaling for CORESET indicated by the CORESET ID field. It is possible to indicate one of the TCI-states set through

In this way, the terminal, which has received the TCI-state indication and/or activation for CORESET through MAC CE signaling, is in one or more search spaces to which the CORESET is connected until another TCI-state is indicated through another MAC CE signaling thereafter. All of them can be regarded as having the same QCL information applied.

<TCI state for Radio link monitoring (RLM)>

If the UE does not configure or receive RLM-RS related higher configuration information, but the UE includes one or a plurality of CSI-RSs in the TCI states configured or provided for PDCCH reception, the UE may operate as follows. .

- If the TCI-state activated for PDCCH reception includes only one RS, the UE performs RLM operation using the RS.

- The UE does not need to perform RLM using aperiodic RS or semi-persistent RS.

인 경우, 단말은 PDCCH 수신을 위해 활성화 및 제공된 TCI-state의 RS들 중에서 상기 PDCCH가 전송되는 CORESET에 연계된 탐색 공간들 중에서 PDCCH 모니터링 주기(monitoring periodicity)가 짧은 순서부터

개의 RS를 선택한다. 하나 이상의 CORESET들에 대한 탐색 공간들이 동일한 PDCCH 모니터링 주기를 가지는 경우, 단말은 CORESET 인덱스가 높은 순서로 CORESET의 선택 순서를 결정할 수 있다.- if

, the UE starts with the shortest PDCCH monitoring period among the search spaces associated with the CORESET in which the PDCCH is transmitted among the RSs of the TCI-state activated and provided for PDCCH reception.

Select RSs. When the search spaces for one or more CORESETs have the same PDCCH monitoring period, the UE may determine the selection order of CORESETs in the order of the highest CORESET index.

A UE configured with a plurality of downlink bandwidth parts for a serving cell may perform RLM using the following RS. The RS is the RS corresponding to the RS index set or provided through 'RadioLinkMonitoringRS', which is higher layer signaling for the activated downlink bandwidth part, or is an RS corresponding to the RS index that is set or provided through 'RadioLinkMonitoringRS', which is higher layer signaling for the activated downlink bandwidth part, through 'RadioLinkMonitoringRS' If it is not set or provided, it is the RS of the TCI-state set and activated in the CORSET for PDCCH reception in the activated downlink bandwidth part.

<TCI state for PDCCH assignment>

The terminal, which is provided with 0 as a search space ID for the C-RNTI and type 0/0A/2 PDCCH CSS set, determines the PDCCH monitoring occasion of the type 0/0A/2 PDCCH CSS set as follows, and SS At the PDCCH monitoring time associated with the /PBCH block, PDCCH candidates may be monitored. Here, the SS/PBCH block may be determined according to at least one of the following.

- SS/PBCH block in QCL relationship with CSI-RS included in TCI-state indicated or activated by MAC CE activation indicator in the activated bandwidth part including CORESET index 0, or

- SS/PBCH block used in the most recently performed contention-based random access procedure

The terminal that is not provided with TCI state information indicating QCL information of the DM-RS antenna port of the PDCCH transmitted from CORESET, the DM-RS antenna port of the PDCCH transmitted from CORESET set by the configuration information transmitted through the MIB, It can be assumed that both the DM-RS antenna port of the PDSCH scheduled through the PDCCH and the SS/PBCH block transmitting the MIB are QCLed for average gain, QCL-TypeA, and QCL-Type D characteristics.

For CORESET having index 0, the UE may assume that the DM-RS antenna port of the PDCCH received in the CORESET is QCLed with the downlink RS or SS/PBCH block as follows. In other words, when the TCI state is indicated or activated by the MAC CE activation command for the CORESET, the UE sets one or a plurality of downlink RSs configured through the TCI-state and the DM-RS antenna port of the PDCCH. It can be assumed that are QCLed to each other. If, after the most recent random access procedure among random access procedures other than the contention-free random access procedure triggered by the PDCCH command (order), the MAC CE activation command indicating or activating the TCI state for the CORESET is not received, the UE is the It may be assumed that the SS/PBCH block identified by the UE is QCLed during the most recent random access procedure.

For CORESETs other than CORESET having index 0, the terminal has not been provided with configuration information of TCI state through CORESET configuration information as shown in <Table 8>, or initial configuration of a plurality of TCI states ), but does not receive a MAC CE activation command for indicating or activating one TCI state for the CORESET, the terminal receives the DM-RS antenna port of the PDCCH received from the CORESET and in the initial access procedure It may be assumed that the identified SS/PBCH block is QCL.

For CORESETs other than CORESET having index 0, the UE was provided with configuration information of the TCI state through CORESET setting information as shown in Table 8 as part of a reconfiguration with sync procedure, but in the CORESET If the UE does not receive a MAC CE activation command indicating or activating one TCI state for the UE, the UE identifies SS/ It may be assumed that the PBCH block or CSI-RS is QCL.

For CORESETs other than CORESET having index 0, the terminal has been provided with one TCI state for the CORESET, or has received a MAC CE activation command indicating or activating one TCI state for the CORSET. It may be assumed that the DM-RS antenna port of the PDCCH received in the CORESET is QCLed to one or a plurality of RSs configured through the TCI state.

For the CORESET having index 0, the UE may receive the QCL-TypeD attribute of the CSI-RS set through the TCI state indicated or activated through the MAC CE activation command from the SS/PBCH.

슬롯 이후의 첫 번째 슬롯에서부터 상기 MAC CE 시그널링에 의해 지시되는 TCI state를 적용하고, 상기 TCI state를 포함하는 빔 정보를 기반으로 PDCCH를 수신한다. 여기서

는 부반송파 간격(μ)에 대해 각 서브프레임에 포함된 슬롯의 수이다.Upon receiving the MAC CE signaling, the UE transmits HARQ-ACK information for the PDSCH providing the MAC CE signaling through the PUCCH in a slot (eg, slot k).

The TCI state indicated by the MAC CE signaling is applied from the first slot after the slot, and the PDCCH is received based on beam information including the TCI state. here

is the number of slots included in each subframe for the subcarrier interval (μ).

<Slot Format Indicator (SFI)>

In the 5G communication system, the downlink signal transmission section and the uplink signal transmission section may be dynamically changed. To this end, the base station may indicate to the terminal whether each of the OFDM symbols constituting one slot is a downlink symbol, an uplink symbol, or a flexible symbol through a slot format indicator (SFI). Here, the flexible symbol may mean neither a downlink nor an uplink symbol, or a symbol that can be changed to a downlink or uplink symbol by UE-specific control information or scheduling information. In this case, the flexible symbol may include a gap period (Gap guard) required in the process of switching from downlink to uplink.

Upon receiving the slot format indicator, the terminal may perform a downlink signal reception operation from the base station in a symbol indicated by a downlink symbol, and may perform an uplink signal transmission operation to the base station in a symbol indicated by the uplink symbol. have. For a symbol indicated by a flexible symbol, the terminal may perform at least a PDCCH monitoring operation, and through another indicator, for example, DCI, the terminal performs a downlink signal reception operation from the base station in the flexible symbol (for example, For example, when DCI format 1_0 or 1_1 is received), an uplink signal transmission operation to the base station may be performed (eg, when DCI format 0_0 or 0_1 is received).

10 is a diagram illustrating an example of uplink-downlink configuration (UL/DL configuration) in a 5G system, in which three steps of uplink-downlink configuration of symbols/slots are illustrated.

Referring to FIG. 10 , in the first step, cell-specific configuration information 1010 for configuring uplink-downlink semi-statically, for example, system information such as SIB, is transmitted to the symbol/slot uplink. Link - Set the downlink. Specifically, the cell-specific uplink-downlink configuration information 1010 in the system information may include uplink-downlink pattern information and information indicating a reference subcarrier interval. The uplink-downlink pattern information includes a transmission periodicity 1003 of each pattern, and the number of consecutive full DL slots at the beginning of each DL-UL pattern from the start point of each pattern. ) (1011) and the number of consecutive DL symbols in the beginning of the slot following the last full DL slot (1012) from the beginning of the next slot (1012), uplink consecutive from the end of each pattern Number of consecutive full UL slots at the end of each DL-UL pattern (1013), and Number of consecutive UL symbols in the end of the slot preceding the first full UL slot ( 1014) may be indicated. In this case, the UE may determine a slot/symbol not indicated by uplink or downlink as a flexible slot/symbol.

In a second step, the UE-specific configuration information 1020 delivered through UE-specific higher layer signaling (ie, RRC signaling) is a flexible slot or a slot including a flexible symbol (1021, 1022). It indicates symbols to be configured as downlink or uplink in the . For example, the terminal-specific uplink-downlink configuration information 1020 includes a slot index indicating slots 1021 and 1022 including flexible symbols, and the number of consecutive downlink symbols from the start of each slot. DL symbols in the beginning of the slot (1023, 1025) and the number of consecutive UL symbols in the end of the slot (1024, 1026) from the end of each slot, or For each slot, information indicating the entire downlink or information indicating the entire uplink may be included. In this case, the symbol/slot configured as uplink or downlink through the cell specific configuration information 1010 of the first step cannot be changed to downlink or uplink through UE-specific higher layer signaling 1020. .

Finally, in order to dynamically change the downlink signal transmission interval and the uplink signal transmission interval, the downlink control information of the downlink control channel includes a plurality of slots starting from the slot in which the UE detects the downlink control information. a slot format indicator 1030 indicating whether each symbol in each slot is a downlink symbol, an uplink symbol, or a flexible symbol. In this case, for the symbol/slot configured as uplink or downlink in the first and second steps, the slot format indicator cannot indicate that it is downlink or uplink. The slot format of each slot 1031 and 1032 including at least one symbol that is not configured as uplink or downlink in the first and second steps may be indicated by the corresponding downlink control information.

The slot format indicator may indicate the uplink-downlink configuration for 14 symbols in one slot as shown in Table 14 below. The slot format indicator may be simultaneously transmitted to a plurality of terminals through a terminal group (or cell) common control channel. In other words, the downlink control information including the slot format indicator may be transmitted through a CRC-scrambled PDCCH with an identifier different from the UE-specific cell-RNTI (C-RNTI), for example, an SFI-RNTI. The downlink control information may include a slot format indicator for one or more slots, that is, N slots. Here, the value of N may be an integer greater than 0, or a value set by the UE through higher layer signaling from the base station among a set of predefined possible values, such as 1, 2, 5, 10, 20, or the like. The size of the slot format indicator may be set by the base station to the terminal through higher layer signaling.

In <Table 14>, D denotes a downlink symbol, U denotes an uplink symbol, and F denotes a flexible symbol. According to <Table 14>, the total number of supportable slot formats for one slot is 256. In the NR system, the maximum size of information bits that can be used for slot format indication is 128 bits, and the base station can set it to the terminal through higher layer signaling, for example, 'dci-PayloadSize'.

In this case, the cell operating in the unlicensed band may set and indicate the additional slot format as shown in <Table 15> by introducing one or more additional slot formats or by modifying at least one of the existing slot formats. <Table 15> shows an example of additional slot formats in which one slot consists only of an uplink symbol and a flexible symbol (F).

format Symbol number (or index) within one slot 0 One 2 3 4 5 6 7 8 9 10 11 12 13 56 F U U U U U U U U U U U U U 57 F F U U U U U U U U U U U U 58 U U U U U U U U U U U U U F 59 U U U U U U U U U U U U F F …

In one embodiment, the downlink control information used for the slot format indication may indicate the slot format(s) for a plurality of serving cells, and the slot format(s) for each serving cell is a serving cell ID (serving). cell ID). Also, a slot format combination for one or more slots for each serving cell may be indicated by downlink control information. For example, when the size of one slot format indicator index field in downlink control information is 3 bits and indicates the slot format for one serving cell, the 3-bit slot format indicator index field has a total of 8 slot formats. (or slot format combination) may be indicated, and the base station may indicate the slot format indicator index field through terminal group common downlink control information (common DCI). In an embodiment, at least one slot format indicator index field included in the downlink control information may be configured as a slot format combination indicator for a plurality of slots. For example, <Table 16> shows a 3-bit slot format combination indicator composed of the slot formats of <Table 14> and <Table 15>. Among the values of the slot format combination indicator, {0, 1, 2, 3, 4} indicates the slot format for one slot. The remaining three values {5, 6, 7} indicate the slot format for 4 slots, and the UE indicates the 4 slots sequentially from the slot in which the downlink control information including the slot format combination indicator is detected. slot format can be applied.

Slot format combination ID Slot Formats 0 0 One One 2 2 3 19 4 9 5 0 0 0 0 6 1 1 1 1 7 2 2 2 2

<XDD> As a 5G wireless communication system, for example, an NR system generally uses a higher center frequency than an LTE system, communication service coverage between a base station and a terminal is reduced, and thus coverage enhancement is required. In particular, in the case of a TDD (Time Division Duplexing) system in which the ratio of downlink in the time domain is generally higher than that of uplink in order to support a service in which the transmission power of the terminal is generally lower than the transmission power of the base station and the proportion of downlink traffic is high. , it is important to improve uplink coverage. As a method of physically improving the coverage of the uplink channel between the base station and the terminal, the uplink time resource is increased, the center frequency of the uplink carrier is lowered, or a frequency having a low center frequency is used, or the transmission power of the terminal is increased. A method of increasing , etc. may be considered. However, changing the frequency may be limited because the frequency band is determined for each network operator. In addition, increasing the maximum transmit power of the terminal may be limited in increasing the maximum transmit power of the terminal because the maximum allowable transmit power is determined according to the regulation for each region or frequency band in order to reduce interference.

Therefore, in order to improve the coverage of the base station and the terminal, the ratio of uplink and downlink is not divided only in the time domain according to the proportion of uplink and downlink traffic in the TDD system, but uplink resources and downlink in the frequency domain as in the FDD system. A system for increasing uplink time resources may be required by dividing link resources to be used. In the present disclosure, an XDD system is defined as a system that can flexibly divide and use uplink resources and downlink resources in a time domain or/and a frequency domain. In this case, X included in XDD may mean time or frequency. In addition, the XDD system is an enhanced TDD system, a Flexible TDD system, a Hybrid TDD system, a TDD-FDD system, a Hybrid TDD-FDD system, a Full Duplex system, or a Hybrid Division Duplex (HDD) system. Also referred to as at least one or more. may be, and in the present disclosure, it will be described as an XDD system for convenience of description.

11 is a diagram illustrating an uplink-downlink configuration of an XDD system in which an uplink resource and a downlink resource are flexibly divided in a time domain and a frequency domain according to an embodiment of the present disclosure. The time domain of FIG. 11 may be in units of one or more symbols or one or more slots.

11, the uplink-downlink configuration 1100 of the entire XDD system from the perspective of the base station is based on the weight of uplink and downlink traffic for the entire frequency band 1101, An uplink resource 1105 and a downlink resource 1103 may be flexibly allocated to each symbol or slot 1102 . In this case, a guard band (guard band, 1104) and/or flexible resources may be allocated between the downlink resource 1103 and the uplink resource 1105 in the frequency band. That is, when the base station transmits a downlink channel or signal in the downlink resource 1103, the uplink channel or signal is received by out-of-band emission or unwanted emission. As a method for reducing interference caused by the interference, the guard band 1104 and/or flexible resources may be allocated. In the embodiments shown on the right side of FIG. 11 , terminal 1 1110 and terminal 2 1120 having more downlink traffic than uplink traffic according to the configuration of the base station set the downlink and uplink resource ratios in the time domain. It can be assigned in a 4:1 ratio. 11 illustrates that terminal 3 1130, which is located at the cell boundary and lacks uplink coverage, is allocated only uplink resources in a specific time interval by the configuration of the base station. Additionally, UE 4 1140, which operates at the cell boundary and lacks uplink coverage, but has relatively large amounts of downlink and uplink traffic, is allocated a lot of uplink resources in the time domain for uplink coverage and downlinks in the frequency band. A lot of link resources can be allocated.

More downlink resources are allocated in the time domain to UEs with relatively large downlink traffic operating at the cell center, and uplink resources are allocated in the time domain to UEs with relatively insufficient uplink coverage operating at the cell boundary. By allowing more allocation, uplink coverage can be extended. In this case, the XDD system has the advantage of being able to more flexibly allocate uplink and downlink transmission/reception resources in the time and frequency domains according to the weight of uplink and downlink traffic as well as the uplink coverage extension effect. For example, the XDD system may also be utilized when providing a URLLC service requiring minimization of uplink transmission delay, or when simultaneous uplink and downlink transmission and reception are required, such as a relay or an IAB (Integrated Access and Backhaul) system.

In the present disclosure, in an XDD system capable of flexibly allocating uplink and downlink resources in the time and/or frequency domain, a method for setting uplink-downlink resources in the time domain and frequency domain, and channels of the base station and the terminal accordingly and a method and apparatus for transmitting and receiving a signal. In addition, the present disclosure proposes an uplink-downlink transmission/reception method and apparatus between a base station and a terminal on the assumption of an XDD system. The application of the present disclosure is not limited to the XDD system, and the uplink-downlink transmission/reception method of the base station and the terminal in another division duplex system or a full duplex system that may be provided in a 5G system and It can also be applied to devices.

An embodiment of the present disclosure relates to a method and apparatus for configuring a resource for uplink or downlink transmission/reception in a bandwidth or a frequency domain within a bandwidth part in an XDD system. Through the method of setting a resource for uplink or downlink transmission and reception according to an embodiment of the present disclosure, the terminal is capable of uplink transmission in a bandwidth or a frequency domain within a bandwidth part for a specific time (symbol unit or slot unit) At least one of an uplink resource, a downlink resource capable of downlink reception, or a flexible resource capable of uplink transmission or downlink reception may be configured.

In addition, unlike a TDD system in which resource configuration for uplink or downlink transmission/reception can be configured only in the time domain, the XDD system divides or distinguishes resources for uplink and downlink transmission/reception in the frequency domain as well as the time domain. . At this time, if the uplink and downlink resources are set together within the bandwidth or the bandwidth part, the interference effect occurs due to at least one of interference between uplink and downlink transmission/reception, out-of-band emission, and spurious emission. A guard band may be required between downlink resources. In the present disclosure, the guard band is specified by a frequency range, and according to an embodiment, the guard band may include a guard period specified by a time range. In an embodiment of the present disclosure, the guard band may be predefined or selected from a plurality of frequency bands configured through higher layer signaling. Through the method of setting a resource for uplink or downlink transmission and reception according to an embodiment of the present disclosure, the terminal performs uplink and downlink within the bandwidth or bandwidth part of the frequency domain at a specific time (symbol unit or slot unit) One or more guard bands may be set between resources. That is, the terminal may configure or determine one or more resource block sets using the configured guard band. In the present disclosure, a resource block set includes one or more resource blocks, and may be configured in a unit smaller than a resource block (eg, a resource element) according to an embodiment. An operation in which the terminal sets or determines one or more resource block sets using the configured guard band will be described with reference to FIG. 12 .

A terminal supporting the XDD system receives one or more intra-cell guard bands for a cell or carrier through a higher layer signal from a base station in order to minimize or eliminate the influence of interference that may occur during uplink and downlink transmission and reception. A guard band within a cell may be set using a predefined guard band. In this case, the intra-cell guard band configuration may be independently configured or identically configured for each of the downlink cell or carrier and the uplink cell or carrier.

Meanwhile, for convenience of explanation, various embodiments of the present disclosure will be described on the assumption that the terminal receives a guard band for each cell. .

12 is a diagram illustrating an example in which one or more intra-cell guard bands are set within the bandwidth or bandwidth part of a cell supporting XDD or a carrier using XDD. Figure 12 (a) is an example in which three resource block sets (RB-sets) are set in the bandwidth of the carrier, the bandwidth of the terminal, or the bandwidth part, Figure 12 (b) is the bandwidth of the carrier, the bandwidth of the terminal, or the bandwidth This is an example in which two resource block sets (RB-sets) are configured in a part.

개의 보호 대역을 각각 설정 받을 수 있다. 여기서 x=DL 또는 UL이고, DL은 하향링크 셀 또는 케리어을 의미하고, UL은 상향링크 셀 또는 케리어를 의미한다. 표 17은 상위 계층 시그널링의 일 예이다. 상기 상위 계층 시그널링은, 예를 들어, UL-DL-GuardBand 을 포함할 수 있다.The terminal is in a cell or carrier through higher layer signaling

Each of the two guard bands can be set. Here, x=DL or UL, DL means a downlink cell or carrier, and UL means an uplink cell or carrier. Table 17 is an example of higher layer signaling. The higher layer signaling may include, for example, UL-DL-GuardBand.

UL-DL-GuardBand ::= SEQUENCE (SIZE (1..X0)) OF GuardBand
GuardBand :: = SEQUENCE {
startCRB INTEGER(0..X1),
nrofCRBs INTEGER (0..X2)
}

이고, nrofCRBs는, 도 12의 B' 또는 D'와 같이, 셀 내 보호 대역의 길이 또는 크기

이다. start CRB 및 nrofCRBs는 CRB의 수 (N) 또는 PRB의 수(N)로 표현될 수 있다. 이때, B'및 D'의 값은 서로 같거나 다를 수 있다. 표 17에서 X0, X1 및 X2의 일 예는 4, 274 및 15일 수 있다. 한편, nrofCRBs는, 도 12의 C 또는 E와 같이, 셀 내 보호 대역의 마지막 CRB의 인덱스

를 지칭하는 값일 수 있다. nrofCRBs의 값이 0인 경우에는 셀 내 보호 대역이 존재하지 않는 것 또는 보호 대역의 크기가 0인 것 중 하나를 의미할 수 있다. 상기 GuardBand 정보는 하나 이상의 (startCRB, nrofCRBs) 값을 포함할 수 있으며, 상기 각 두개 (every two values)의 값 중 첫 번째 값은 셀 내 보호 대역의 가장 낮은 CRB 인덱스

이고 두 번째 값은 셀 내 보호 대역의 길이 또는 크기

를 의미할 수 있다. 여기서 상기 CRB 인덱스는 PRB 인덱스로 대체되어 표현될 수도 있다. In Table 17, startCRB is the index of the start CRB of the guard band within the cell, as shown in B or D of FIG. 12 .

, and nrofCRBs is the length or size of the guard band within the cell, as shown in B ' or D ' of FIG. 12 .

to be. The start CRB and nrofCRBs may be expressed as the number of CRBs (N) or the number of PRBs (N). In this case, the values of B' and D' may be the same as or different from each other. In Table 17, examples of X0, X1, and X2 may be 4, 274, and 15. On the other hand, nrofCRBs is the index of the last CRB of the guard band within the cell, as shown in C or E of FIG. 12 .

may be a value indicating When the value of nrofCRBs is 0, it may mean either that there is no guard band in the cell or that the size of the guard band is 0. The GuardBand information may include one or more (startCRB, nrofCRBs) values, and the first of the two values is the lowest CRB index of the guard band within the cell.

and the second value is the length or size of the guard band within the cell

can mean Here, the CRB index may be expressed by being replaced with a PRB index.

개)를 판단할 수 있다. 단말은 판단된 셀 내 보호 대역의 수에 따라 자원 블록 집합의 수 (예를 들어

개)를 판단할 수 있다.According to an embodiment of the present disclosure, the UE uses the number of CRB information (startCRB, nrofCRBs) included in UL-DL-GuardBand information or the sequence length of UL-DL-GuardBand information (eg, sequence length / 2) to the number of guard bands in the uplink/downlink cell set by the base station (for example,

dog) can be determined. The UE determines the number of resource block sets (eg, the number of guard bands in the cell)

dog) can be determined.

개의 자원 블록 집합 (RB-set) 또는 자원영역으로 구분할 수 있으며, 각각의 자원 블록 집합에 포함된 자원을 이용하여 상/하향링크 송수신을 수행할 수 있다. 이때, 각 자원 블록 집합의 주파수 자원 영역은 다음과 같이 판단될 수 있다.As described above, the terminal having the intra-cell guard band configured uses a resource region excluding the intra-cell guard band from the bandwidth or bandwidth part.

It can be divided into resource block sets (RB-sets) or resource regions, and uplink/downlink transmission and reception can be performed using resources included in each resource block set. In this case, the frequency resource region of each resource block set may be determined as follows.

- The first or starting CRB index (A in FIG. 12(a) and A in FIG. 12(b)) of the first resource block set (eg, resource block set index 0):

- The last (last) or end (end) CRB index of the first resource block set (B in FIG. 12(a) and B in FIG. 12(b)):

)의 첫번째 또는 시작 CRB 인덱스 (도 12(a)의 E 및 도 12(b)의 C):

- The last resource block set (eg, resource block set index)

) of the first or starting CRB index (E in FIG. 12(a) and C in FIG. 12(b)):

- Last or ending CRB index of the last resource block set (F in FIGS. 12(a) and 12(b)):

- The first or starting CRB index of one or more resource block sets between the first resource block set and the last resource block set (C in Fig. 12(a)):

- The last or ending CRB index of one or more resource block sets between the first resource block set and the last resource block set (D in Fig. 12(a)):

개의 RB로 구성될 수 있으며, 여기서

이다. 또한, 여기서

,

는 부반송파 간격 설정

에 따라 상기 케리어의 가용 가능한 첫번재 RB 및 대역폭으로 상위 계층 신호를 통해 설정 받을 수 있다. At this time, the resource block set s is

may consist of RBs, where

to be. Also, here

,

set the subcarrier spacing

Accordingly, the first available RB and bandwidth of the carrier may be set through a higher layer signal.

If the terminal is set to have the size of the guard band equal to 0 for the entire guard band in a certain time period, the terminal can determine that it has been set that the guard band does not exist in the cell or carrier in the corresponding time period. .

, 셀 내 보호 대역의 크기

, 또는 마지막 또는 종료 CRB 인덱스

중 적어도 하나가 사전에 정의(predefined)되어 있다는 것을 의미할 수 있다.If the UE does not set the intra-cell guard band through higher layer signaling (UL-DL-GuardBand), the UE uses a pre-defined intra-cell guard band and resource block set pattern with the base station to establish the intra-cell guard band. and a frequency resource region of the resource block set(s) may be determined. The resource block set pattern may have various number of resource block sets and guard bands, for example, as shown in FIG. 13 . In this case, the guard band and resource block aggregation pattern in the cell may be predefined according to the subcarrier interval and the size of a carrier or bandwidth part. In addition, the guard band in the cell may be independently predefined for downlink and uplink or set through a higher layer signal, and at least one of the position or size of the guard band in the downlink cell is the guard band in the uplink cell. may be the same as at least one of the position or size of , or may all be different. Here, that the intra-cell guard band is predefined means the first or start CRB index of the intra-cell guard band for each of the intra-cell guard bands.

, the size of the guard band within the cell

, or the last or ending CRB index

It may mean that at least one of them is predefined.

및

인 것으로 판단할 수 있다. 여기서

이다. 대역폭파트 i내에서의 자원 블록 집합의 자원 블록 집합 인덱스는 0부터

까지 오름차순 순으로 각각 결정될 수 있다. 여기서

는 대역폭파트 i에 포함된 자원 블록 집합의 수이다. 본 개시의 일 실시예에 따르면, 대역폭파트 i의 RBset#0은 셀 또는 케리어의 RBset#s0에 대응되고, 대역폭파트 i의 RBset#

은 셀 또는 케리어의 RBset#s1에 대응될 수 있다. At this time, with respect to the cell or carrier, the terminal for uplink or downlink bandwidth part i

and

can be judged to be here

to be. The resource block set index of the resource block set in bandwidth part i starts from 0.

up to and may be determined in ascending order. here

is the number of resource block sets included in bandwidth part i. According to an embodiment of the present disclosure, RBset#0 of bandwidth part i corresponds to RBset#s0 of a cell or carrier, and RBset# of bandwidth part i

may correspond to RBset#s1 of a cell or carrier.

In this case, the UE may be configured to determine whether each of the determined resource block sets is a downlink resource block set or an uplink resource block set through a higher layer signal. In this case, the UE may be configured as a flexible resource block set that can be a downlink or uplink resource block set through a higher layer signal. In other words, the terminal may receive a configuration of whether the resource is an uplink resource, a downlink resource, or a flexible resource with respect to a frequency domain resource through a higher layer signal, and an example of a higher layer signal is shown in Table 18 same.

XDD-UL-DL-Configuration ::= SEQUENCE (SIZE (1..X3)) OF RBset-UL-DL

RBset-UL-DL ::= ENUMERATED {downlink, uplink, flexible}

또는

개의 자원 블록 집합에 대하여 각 자원 블록 집합이 하향링크용 자원 블록 집합(이하 하향링크 자원 블록 집합)인지, 또는 상향링크용 자원 블록 집합(이하 상향링크 자원 블록 집합)인지, 또는 하향링크 또는 상향링크 자원 블록 집합이 될 수 있는 유연한(flexible) 자원 블록 집합 (이하 유연한 자원 블록 집합)인지를 기지국으로부터 설정 받을 수 있다. 도 12(a)를 예를 들어 설명하면, RBset#0은 하향링크 자원 블록 집합, RBset#1은 유연한 자원 블록 집합 (또는 상향링크 자원 블록 집합), RBset#2는 하향링크 자원 블록 집합인 것으로 각각 설정 받을 수 있다. 도 12(b)를 예를 들어 설명하면, RBset#0은 유연한 자원 블록 집합 (또는 상향링크 자원 블록 집합), RBset#1는 하향링크 자원 블록 집합인 것으로 각각 설정 받을 수 있다. 이때, 단말은 상향링크 및 하향링크 셀 또는 케리어 또는 대역폭파트 각각에 대해 상위 계층 신호를 통해 자원 블록 집합에 대한 설정을 받을 수 있다. 예를 들어, 상향링크 셀 또는 케리어 또는 대역폭파트에 대해서는 XDD-UL-DL-Configuration 또는 XDD-UL-DL-Configuration-UL을 통해 자원 블록 집합에 대한 설정을 받고, 하향링크 셀 또는 케리어 또는 대역폭파트에 대해서는 XDD-UL-DL-Configuration 또는 XDD-UL-DL-Configuration-DL을 통해 자원 블록 집합에 대한 설정을 받을 수 있다. 이때, 상기 상위 계층 신호들은 예시들일 뿐이며 다른 신호들이 사용될 수도 있다. 또한, 상기 XDD-UL-DL-Configuration에 관한 정보가 UL-DL-GuardBand를 통해 단말에게 설정되는 것도 가능하다.In other words, the terminal through XDD-UL-DL-Configuration

or

For each resource block set, whether each resource block set is a downlink resource block set (hereinafter referred to as a downlink resource block set) or an uplink resource block set (hereinafter referred to as an uplink resource block set), or downlink or uplink Whether it is a flexible resource block set that can be a resource block set (hereinafter, a flexible resource block set) may be configured from the base station. 12(a) as an example, RBset#0 is a downlink resource block set, RBset#1 is a flexible resource block set (or uplink resource block set), and RBset#2 is a downlink resource block set. Each can be set. 12(b) as an example, RBset#0 may be set as a flexible resource block set (or uplink resource block set) and RBset#1 as a downlink resource block set may be set respectively. In this case, the UE may receive the configuration of the resource block set through a higher layer signal for each of the uplink and downlink cells or carriers or bandwidth parts. For example, for an uplink cell or carrier or bandwidth part, a configuration for a resource block set is received through XDD-UL-DL-Configuration or XDD-UL-DL-Configuration-UL, and a downlink cell or carrier or bandwidth part is received. can receive the configuration for the resource block set through XDD-UL-DL-Configuration or XDD-UL-DL-Configuration-DL. In this case, the higher layer signals are only examples, and other signals may be used. In addition, it is also possible that the information on the XDD-UL-DL-Configuration is configured to the UE through the UL-DL-GuardBand.

또는

개의 자원 블록 집합이 모두 유연한 자원 블록 집합인 것으로 판단할 수 있다. 이때, 단말은 하향링크 대역폭 또는 하향링크 대역폭파트의 경우

개 또는

개의 자원 블록 집합이 모두 하향링크 자원 블록 집합인 것으로 판단하고, 상향링크 대역폭 또는 상향링크 대역폭파트의 경우

개 또는

개의 자원 블록 집합이 모두 상향링크 자원 블록 집합인 것으로 판단할 수 있다.If XDD-UL-DL-Configuration is not configured or provided, the terminal

or

It can be determined that all resource block sets are flexible resource block sets. At this time, in the case of a downlink bandwidth or a downlink bandwidth part, the terminal

dog or

It is determined that all resource block sets are downlink resource block sets, and in the case of uplink bandwidth or uplink bandwidth part

dog or

It can be determined that all resource block sets are uplink resource block sets.

13 is a diagram illustrating examples of frequency domain resource block set configuration of a terminal that has been configured with two or three resource block sets for a downlink bandwidth part.

As shown in FIG. 13 (a), according to an embodiment of the present disclosure, if RBset #0 and RBset #2 are a downlink resource block set (set) through an upper signal (XDD-UL-DL-Configuration), the terminal After being configured, RBset#1 may be configured as a flexible resource block set. Alternatively, as shown in FIG. 13C , RBset#0, RBset#1, and RBset#2 may all be configured as downlink resource block sets through a higher-order signal (XDD-UL-DL-Configuration). As shown in FIG. 13(b), the terminal receives two resource block sets for the downlink bandwidth part, and RBset#1 is set as the downlink resource block set through a higher-order signal (XDD-UL-DL-Configuration). , and RBset#0 may be set as a flexible resource block set. Meanwhile, FIG. 13 is only examples of resource block set configuration for the downlink bandwidth part, and various applications are possible.

14 is a diagram illustrating an example of a frequency domain resource block set configuration of a terminal that has received two or three resource block sets for an uplink bandwidth part.

As shown in FIG. 14( a ), the terminal configured to be divided into three resource block sets for the uplink bandwidth part, according to an embodiment of the present disclosure, RBset#0 through a higher-order signal (XDD-UL-DL-Configuration) and RBset#2 may be configured as a flexible resource block set, and RBset#1 may be configured as an uplink resource block set. As shown in FIG. 14(b) , the terminal configured to be divided into two resource block sets for the uplink bandwidth part, RBset#1 through a higher-order signal (XDD-UL-DL-Configuration) according to an embodiment of the present disclosure may be configured as a flexible resource block set, and RBset#0 may be configured as an uplink resource block set. As shown in FIG. 14(c) , the terminal configured to be divided into three resource block sets for the uplink bandwidth part is RBset#0 through a higher-order signal (XDD-UL-DL-Configuration) according to an embodiment of the present disclosure. and RBset#2 may be configured as an uplink resource block set, and RBset#1 may be configured as a flexible resource block set. Alternatively, the terminal configured to be divided into three resource block sets for the uplink bandwidth part as shown in FIG. 14(d) determines that RBset#0, RBset#1, and RBset#2 are all uplink resource block sets, or All of Bset#0, RBset#1, and RBset#2 may be set as uplink resource block sets by a separate, explicit signal. Meanwhile, FIG. 14 is only examples of resource block set configuration for the uplink bandwidth part, and various applications are possible.

13 and 14 are for examples in which the terminal explicitly sets the type of each resource block set through a signal from the base station. Alternatively, the UE may determine the type of each resource block set by using information on one or more configured guard bands. For example, in relation to one resource block set between two guard bands, the UE determines that the resource block set is uplinked based on the size (eg, unit of kHz) occupied by the two guard bands in the frequency band. One of a resource block set, a downlink resource block set, or a flexible resource block set may be determined.

In this case, a new bandwidth part setting may be used to support the XDD system. For example, as shown in FIG. 15 , a flexible bandwidth part may be configured in the terminal instead of the uplink bandwidth part or the downlink bandwidth part. 15 is a diagram illustrating an example of setting a flexible bandwidth part to support an XDD system. The flexible bandwidth part may be determined or determined as an uplink bandwidth part, a downlink bandwidth part, or a hybrid (or XDD) bandwidth part obtained by mixing them by at least one of the following methods or a combination thereof. For example, the at least one resource block set configured in the flexible bandwidth part may be determined or determined as one of an uplink resource block set, a downlink resource block set, or a flexible resource block set. On the other hand, the flexible bandwidth part is additionally set to at least one of the uplink and downlink bandwidth parts, or is set to replace at least one of the uplink and downlink bandwidth parts, or the uplink or downlink bandwidth It can be set independently without setting parts.

The UE may determine whether to use the flexible resource block set for uplink transmission or downlink reception. That is, the UE may determine whether the flexible resource block set is a downlink resource block set or an uplink resource block set using one or more of the following methods.

- Method 1: Determination based on uplink transmission or downlink reception information indicated by DCI.

The UE may determine whether the flexible resource block set is a downlink resource block set or an uplink resource block set through DCI received from the base station. For example, when the terminal scheduled to receive the PDSCH through the DCI includes at least one RB among the frequency resources to which the PDSCH is allocated in the flexible resource block set, the terminal determines that the flexible resource block set is downlink It can be determined as a resource block set. As another example, when the terminal scheduled to transmit the PUSCH through the DCI includes at least one RB among the frequency resources to which the PUSCH is allocated is included in the flexible resource block set, the terminal has the flexible resource block set It may be determined as an uplink resource block set. Similarly, a terminal receiving a DCI indicating aperiodic CSI-RS reception SRS transmission or PRACH transmission, etc., has at least one RB or RE among the frequency resources to which the aperiodic CSI-RS, SRS, or PRACH is allocated. When included in the resource block set, it may be determined whether the flexible resource block set is a downlink resource block set or an uplink resource block set.

Taking FIG. 13(a) as an example, a description will be given of a method in which the terminal determines the frequency domain configuration for the resource block set(s) in the downlink bandwidth part. If the UE receives a DCI indicating reception of aperiodic CSI-RS, and at least one RE or RB of the aperiodic CSI-RS indicated through the DCI is included or crossed in the flexible resource block set (RBset#1) In this case, the UE may determine that the flexible resource block set (RBset#1) is a downlink resource block set.

Similarly, a method in which the terminal determines the frequency domain configuration for the resource block set in the uplink bandwidth part will be described using FIG. 14(c) as an example. If DCI indicating SRS or PRACH transmission is received, and at least one RE or RB of SRS or PRACH resources indicated through the DCI is included or intersect with the flexible resource block set (RBset#1), the terminal It may be determined that the flexible resource block set (RBset#1) is an uplink resource block set.

- Method 2: Judgment through an indicator indicated through DCI.

The base station determines whether the flexible resource block set is a downlink resource block set or an uplink resource block set in at least one DCI (eg, group common DCI transmitted commonly to a plurality of terminal groups) among DCIs received by the terminal. Information on recognition may be transmitted to the terminal including a field for notifying or indicating. In this case, transmission of the information through group common DCI is only an example, and the information may also be transmitted through cell common DCI or UE-specific DCI.

Upon receiving the DCI from the base station, the UE may determine which resource set (eg, flexible resource block set) is a downlink resource block set or an uplink resource block set according to information on a field included in the DCI. For example, the base station constructs a bitmap of the same size (ie, N bits) as the number (N) of resource block sets included in one of the cell, carrier or bandwidth part with respect to the cell, carrier, or bandwidth part, The bitmap may be used to indicate to the UE whether the resource block set is a downlink resource block set or an uplink resource block set. In this case, from the most significant bit to the least significant bit of the bitmap may be sequentially mapped from a resource block set having a low resource block set index in an increasing order of the resource block set index. For example, a bitmap value of 0 means a downlink resource block set and 1 means an uplink resource block set, and may be defined in advance between the base station and the terminal. Alternatively, the base station may set the bitmap value(s) to the terminal through a higher layer signal. In the previous example, the bitmap value of 0 is defined as an uplink resource block set and 1 as a downlink resource block set, but may be defined differently.

비트와 같거나 또는

비트보다 작은 비트로 표현할 수 있는 정보 또는 정보들의 조합들로 구성된 테이블, 또는 이에 대응되는 정보들로 구성되는 필드가 상기 DCI에 포함될 수도 있다. 이때,

비트와 같거나 또는

비트보다 작은 비트로 표현할 수 있는 정보 또는 정보들의 조합들로 구성된 테이블, 또는 이에 대응되는 정보들은 기지국과 단말간에 사전에 정의되거나 또는 기지국으로부터의 상위 계층 시그널링를 통해 단말에 설정될 수 있다.On the other hand, using the bitmap is only an example,

equal to a bit or

A table composed of information or combinations of information that can be expressed in bits smaller than bits or a field composed of information corresponding thereto may be included in the DCI. At this time,

equal to a bit or

A table composed of information or combinations of information that can be expressed in bits smaller than bits, or information corresponding thereto, may be defined in advance between the base station and the terminal or may be set in the terminal through higher layer signaling from the base station.

Referring to FIG. 13 as an example, a method for the UE to determine the frequency domain configuration for the resource block set with respect to the downlink bandwidth part will be described as follows. The base station configures a 3-bit bitmap for a cell, carrier, or bandwidth part composed of three resource block sets (N=3), and transmits DCI including the bitmap information to the terminal. Upon receiving the DCI, the UE determines the resource block set configuration for each resource block set through the bitmap information. For example, in FIG. 13(a), if the value of the bitmap received by the terminal is 0 0 0, the terminal determines that RBset#0, RBset#1, and RBset#2 are all downlink resource block sets. can As another example, if the value of the received bitmap is 0 1 0, the UE determines that RBset#0 and RBset#2 are downlink resource block sets, and RBset#1 is uplink resource block set. have.

A method for the UE to determine the frequency domain configuration for the resource block set with respect to the uplink bandwidth part will be described using FIG. 14(a) as an example. If the value of the bitmap included in the DCI received by the UE from the base station is 1 0 1, the UE determines that RBset#0 and RBset#2 are uplink resource block sets, and RBset#1 is downlink resource block set can do. In the above, if the value of the received bitmap is 1 1 1, the UE may determine that RBset#0, RBset#1, and RBset#2 are all uplink resource block sets. In this case, if the resource block set is set to be an uplink resource block set or a downlink resource block set through a higher layer signal (eg, XDD-UL-DL-Configuration), the base station It may not be allowed to indicate that the resource block set configured as the uplink resource block set through the higher layer signal is the downlink resource block set through DCI, or the downlink resource block set through the higher layer signal It may not be allowed to indicate that the resource block set set to is the uplink resource block set through DCI.

In other words, the base station always sets the uplink resource block (or the uplink resource block set) through DCI for the resource block set in which the configuration of the resource block set is set to be the uplink resource block set through the higher layer signal (XDD-UL-DL-Configuration). flexible resource block set), and for the resource block set in which the configuration of the resource block set is set to be the downlink resource block set through the upper layer signal (XDD-UL-DL-Configuration), it is always downlinked through DCI It is indicated by a link resource block set (or flexible resource block set). On the other hand, the UE does not provide or configure a resource block set set to be a flexible resource block set or the higher layer signal (XDD-UL-DL-Configuration) through the higher layer signal (XDD-UL-DL-Configuration). In the case of a failed resource block set, it may be assumed that the resource block set may be a downlink resource block set or an uplink resource block set.

At this time, the base station uses a bitmap having the same size as the number of flexible resource block sets included in one of the cell, carrier, or bandwidth part with respect to the cell, carrier, or bandwidth part. It may indicate whether it is a link resource block set or an uplink resource block set. In this case, the size of the bitmap is the same as the number of flexible resource block sets included in each of the uplink bandwidth part and the downlink bandwidth part, or the largest among the number of flexible resource block sets included in the uplink bandwidth part and the downlink bandwidth part. can be determined by a large number.

The most significant bit to the least significant bit of the bitmap may be sequentially mapped from a flexible resource block set having a low resource block set index in an increasing order of the resource block set index. In this case, a bitmap value of 0 means a downlink resource block set and 1 means an uplink resource block set, and may be defined in advance between the base station and the terminal. Alternatively, the base station may set the value(s) of the bitmap to the terminal through a higher layer signal. In the previous example, the bitmap value of 0 is defined as an uplink resource block set and 1 as a downlink resource block set, but may be defined differently.

Referring to FIG. 13(b) as an example, the base station uses a higher layer signal transmitted to the terminal for a cell, carrier, or bandwidth part composed of two resource block sets, the resource block set RBset#1 is downlinked. A resource block set or an uplink resource block set may be set, and RBset#0 may be set as a flexible resource block set. In addition, the base station, among the resource block sets included in the cell, carrier, or bandwidth part, is a bitmap having the same size (ie, N1 bits) as the number (N1) of resource block sets set to be flexible resource block sets through a higher layer signal. Configures bitmap information including , and transmits DCI including the bitmap information to the terminal. Upon receiving the DCI, the UE determines a resource block set configuration for each resource block set included in the cell, carrier, or bandwidth part through the bitmap information. For example, if the corresponding value of the received bitmap information is 0, the UE may determine that RBset#0 is a downlink resource block set. Contrary to this, when the corresponding value of the received bitmap information is 1, the UE may determine that RBset#0 is the uplink resource block set.

According to an embodiment of the present disclosure, each bit of the bitmap may indicate to the UE one or more resource block sets in which downlink reception or uplink transmission is possible (or impossible). In other words, the base station enables downlink reception or uplink transmission of the flexible resource block set in at least one DCI (eg, group common DCI transmitted commonly to a plurality of terminal groups) among DCIs received by the terminal. Information on whether it is a (or impossible) resource block set may be transmitted to the terminal including a field for notifying or indicating. In this case, the type of DCI used is not limited to group common DCI, and the information may be transmitted, for example, through cell common DCI or UE-specific DCI.

Upon receiving the DCI from the base station, the terminal may determine whether the flexible resource block set is a resource block set in which downlink reception is possible (or impossible). Alternatively, it may be determined whether the flexible resource block set is a resource block set in which uplink transmission is possible (or impossible).

A method for the UE to determine whether the flexible resource block set is a resource block set capable of (or impossible) downlink reception with respect to a downlink bandwidth part will be described with reference to FIG. 13(a) as an example. If the value of the bitmap included in the DCI received by the UE from the base station is 1 1 1, the UE may determine that RBset#0, RBset#1, and RBset#2 are all resource block sets capable of downlink reception. . If the value of the bitmap received by the UE is 1 0 1, the UE assumes that it is a resource block set capable of downlink reception in RBset#0 and RBset#2, and a resource block set in which downlink reception is impossible in RBset#1. can judge

A method for the UE to determine whether the flexible resource block set is a resource block set capable of (or impossible) uplink transmission with respect to an uplink bandwidth part will be described with reference to FIG. 14(a) as an example. If the value of the bitmap included in the DCI received by the terminal from the base station is 1 1 1, the terminal may determine that all of RBset#0, RBset#1, and RBset#2 are resource block sets capable of uplink transmission. . If the value of the bitmap received by the UE is 0 1 1, the UE assumes that it is a resource block set capable of uplink transmission in RBset#1 and RBset#2, and a resource block set in which uplink transmission is impossible in RBset#0. can judge

16 shows uplink and downlink configuration in the frequency domain (eg, XDD-UL-DL-Configuration) and/or uplink and downlink configuration in the time domain through a higher layer signal from a base station (eg, tdd-UL-DL-Configuration) is a diagram illustrating a method of determining time and frequency domain uplink and downlink configuration in a configured terminal. In FIG. 16, it is assumed that a terminal is configured with a downlink resource block set as shown in FIG. 13(a), an uplink resource block set as shown in FIG. 14(a), and a flexible resource block set as shown in FIG. 15. As shown in FIG.

The terminal may determine the time domain uplink and downlink configuration information by using at least one of the time domain uplink and downlink configuration information configured from the base station and the slot format indicator received through DCI. In FIG. 16, the UE transmits time domain uplink and downlink configuration information of slot n, slot n+1, slot n+2, and slot n+3 to a downlink slot, a downlink slot, a flexible slot, and an uplink, respectively. A case indicated by a slot is shown. For convenience of description, it is assumed that a downlink slot, a flexible slot, and an uplink slot are indicated in a unit of a slot, but unlike this, a downlink symbol, a flexible symbol, or an uplink symbol in a symbol unit within one slot Likewise, it will be applicable even when indicated as .

In the slot n and slot n+1 indicated by the downlink slot, based on the block set configuration information of the frequency domain resource for the downlink bandwidth part, RBset#0, RBset#1, and RBset#2 are downlinked, respectively. It is determined to be a link resource block set, a flexible resource block set, and a downlink resource block set. If, as in the above-described method 2, the UE determines whether the resource block set determined as the flexible resource block set is a resource block set capable of (or impossible) downlink reception through the bitmap information in the DCI received from the base station. Alternatively, it may be determined whether the resource block set determined as the flexible resource block set is a resource block set capable of (or impossible) uplink transmission. At this time, it may be determined whether the bitmap information is information about the downlink bandwidth portion or the uplink bandwidth portion based on the time domain uplink and downlink configuration or the indication of the slot format indicator.

For example, when the bitmap information is 1 0 1 in slots n and n+1 that are configured or indicated to be downlink slots in the uplink and downlink configuration or slot format indicator of the time domain in FIG. 16, The UE may determine that RBset#0 and RBset#2 are a downlink resource block set or a resource block set capable of downlink reception among the resource block sets in the downlink bandwidth part. In addition, it may be determined that RBset#1 is an uplink resource block set or a resource block set in which downlink reception is impossible. The UE may or may not perform downlink reception according to the determination result for the resource block set(s). That is, the UE may not perform a downlink reception operation for RBset#1. In this case, RBset#0 and RBset#2 are resource block sets set as downlink resource block sets by other settings, and are determined to be resource block sets capable of downlink reception regardless of bitmap information, or a separate determination process Without it, it can be regarded as a downlink resource block set.

In the uplink and downlink configuration or slot format indicator of FIG. 16 , in the slot n+3 configured or indicated to be an uplink slot, when the bitmap information is 1 0 1, the terminal is located within the uplink bandwidth part. Among the resource block sets, it may be determined that RBset#0 and RBset#2 are uplink resource block sets or may be determined as resource block sets capable of uplink transmission. In this case, RBset#1 is a resource block set configured as an uplink resource block set by other settings, and is determined to be a resource block set capable of uplink transmission regardless of bitmap information, or an uplink resource without a separate determination process. It can be regarded as a set of blocks. The UE may or may not perform uplink reception according to the determination result for the resource block set(s).

When the terminal has not set the type of resource block set(s) of the flexible bandwidth part, the terminal may assume that the flexible bandwidth part is either a downlink bandwidth part or an uplink bandwidth part. At this time, it is determined whether the set of one or more flexible resource blocks in the bandwidth part is a resource block set capable of downlink reception or a resource block set in which downlink reception is impossible (assuming that it is a downlink bandwidth part), or It can be determined whether the flexible resource block set is a resource block set capable of uplink transmission or a resource block set in which uplink transmission is impossible (assuming that it is an uplink bandwidth part). For example, in the case of slot n+2, which is configured or indicated to be a flexible slot according to the uplink and downlink configuration or the slot format indicator in the time domain in FIG. 16, the terminal assumes the downlink bandwidth part and the bitmap information (eg, 1 0 1) may be applied to determine whether the flexible resource block set is a resource block set capable of downlink reception or a resource block set in which downlink reception is impossible.

When the terminal receives the set type for the resource block set(s) of the flexible bandwidth part, the terminal applies the bitmap information to the flexible bandwidth part so that the flexible resource block set(s) can receive downlink (or It may be determined whether a resource block set is impossible) or a resource block set in which uplink transmission is possible (or impossible). For example, among the bitmap values, the terminal determines that 0 is a resource block set capable of (or impossible) downlink reception, and bitmap 1 is a resource block set of which uplink transmission is possible (or impossible), and the result of this determination is Accordingly, uplink transmission or downlink reception may be performed.

The range of slots or symbols in which the bitmap information is valid or persistent or remaining may be determined or determined as follows.

The terminal determines that the bitmap information is valid or continues from the first (or last) symbol of the PDCCH in which the DCI including the bitmap information is transmitted or the first (or the last) symbol of the control resource set in which the PDCCH is transmitted. can

As an embodiment, the terminal may determine that the bitmap information is valid or continues until a slot or symbol corresponding to one of the following.

- Downlink slots or symbols configured or indicated according to uplink and downlink configuration or slot format indicator of the time domain.

- The first uplink slot or the symbol immediately before the first uplink slot or symbol configured or indicated according to the uplink and downlink configuration or slot format indicator of the time domain.

- Downlink slots to symbols and flexible slots to symbols configured or indicated according to uplink and downlink configuration or slot format indicator in the time domain.

- A symbol immediately before the first symbol of the next (subsequent) PDCCH or the next control resource set in which DCI including the following (subsequent) bitmap information can be transmitted. Here, the following PDCCH or the following control resource set may be transmitted periodically.

Hereinafter, other embodiments of instructing the resource block set configuration for the flexible resource block set(s) included in a cell, a carrier, or a bandwidth part will be described.

In an embodiment, the base station indicates or provides information indicating a resource block set format indicator (RB-set Format Indicator, RFI) or a resource block set format indicator pattern to the terminal through DCI through DCI. can In the resource block set format indicator or resource block set format indicator pattern, for a cell, a carrier, or a bandwidth part, a flexible resource block set included in one of the cell, carrier or bandwidth part is a downlink resource block set, a flexible resource block set , indicates that it is at least one of an uplink resource block set.

Hereinafter, for convenience of description, the resource block set format indicator may be referred to as indicator information or indicator configuration information. Hereinafter, in the description of the present disclosure, it will be assumed that the indicator information is indicator information for a resource block set configured as a flexible resource block set through a higher-order signal, and this will be described. In one embodiment, the indicator information may provide resource block set format indicator information not only for the resource block set set as the flexible resource block set but also for the resource block set set as the uplink or downlink resource block set through a higher-order signal. have. As an embodiment, a resource block set configured as an uplink or downlink resource block set through a higher-order signal cannot be indicated or changed to a downlink resource block set or an uplink resource block set by the indicator information. In other words, with respect to a resource block set configured as an uplink or downlink resource block set through a higher-order signal, the indicator information may indicate an uplink or downlink resource block set.

Table 19 is an example of indicator information indicating at least one resource block set among a downlink resource block set, a flexible resource block set, and an uplink resource block set for each of the N flexible resource block sets. Here, N may be a value representing the largest number of flexible resource block sets included in one of the uplink or downlink cell, carrier, or bandwidth part for an uplink or downlink cell, carrier, or bandwidth part. Also, in the above, the DCI may be a DCI commonly related to a terminal group including at least one terminal and/or a DCI related to a unique terminal. Upon receiving the indicator information for the flexible resource block set through the DCI, for example, one of the RFI settings of Table 19, the terminal receives each flexible resource block set according to the indicated RFI setting, a downlink resource block set, a flexible It may be determined that one of a resource block set and an uplink resource block set.

RFI Configuration 1st RB-set 2nd RB-set … Nth RB-set 0 DL (UL) DL (UL) … DL (UL) One X DL (UL) … DL (UL) 2 DL (UL) X … DL (UL) … … … … … K-1 X X … DL (UL) K X X … X

In Table 19, the terminal receiving the indicator information may determine the resource block set indicated by X as follows. In an embodiment, the terminal determines that the resource block set indicated by X is a flexible resource block set or an uplink resource block set for a slot indicated as a downlink slot through the slot format indicator, and uplinks through the slot format indicator. In the slot indicated by the link slot, the resource block set indicated by X may be determined to be a flexible resource block set or a downlink resource block set. In an embodiment, the UE may determine that the resource block set indicated by X is always a flexible resource block set regardless of the slot format indicated through the slot format indicator.

In Table 19, K may be the same as or less than ^{2 N} -1, which is the number of cases required to provide indicator information for N resource block sets. Also, K may be the same as or less than ^{2 M} −1, which is a set number that can be indicated by the size (M bits) of a field indicating indicator information in the DCI. As an embodiment, the terminal may set or receive at least one value of M and K from the base station through a higher-order signal.

In an embodiment to be described later, the resource block set format indicator (RFI) provided by the base station through DCI is, with respect to a cell, a carrier, or a bandwidth part, a flexible resource block set included in one of the cell, carrier or bandwidth part downlink It may indicate whether a resource block set capable of reception or uplink transmission or whether the flexible resource block set is a resource block set in which downlink reception or uplink transmission is not possible. Hereinafter, for convenience of description, the resource block set format indicator may be referred to as indicator information or indicator configuration information.

Table 20 is an indicator indicating whether a resource block set in which downlink reception or uplink transmission is possible for each of the N flexible resource block sets or the flexible resource block set indicates a resource block set in which downlink reception or uplink transmission is not possible This is an example of information.

RFI Configuration 1st RB-set 2nd RB-set … Nth RB-set 0 Available Available … Available One Unavailable Available … Available 2 Available Unavailable … Available … … … … … K-1 Unavailable Unavailable … Available K Unavailable Unavailable … Unavailable

In Table 20, the terminal receiving the indicator information determines whether the indicated flexible resource block set is a resource block set capable of downlink reception or uplink transmission, or the flexible resource block set is a resource for which downlink reception or uplink transmission is not possible. Whether it is a block set can be determined as follows.

In an embodiment, for a resource block set indicated as available among the slots indicated by the downlink slot through the slot format indicator, the UE selects a downlink signal or channel in the indicated flexible resource block set, e.g. For example, at least one signal or channel among PDCCH, CSI-RS, and SS/PBCH configured to be received in the flexible resource block set may be received. With respect to the resource block set indicated as unavailable among the slots indicated by the downlink slot through the slot format indicator, the UE is a downlink signal or channel in the indicated flexible resource block set, for example, the flexible resource At least one signal or channel among PDCCH, CSI-RS, and SS/PBCH configured to be received in the block set may not be received. In an embodiment, when some resources (eg, at least one PRB, or at least one of RE, REG, or CCE) among the configured downlink signals or channels overlap or are included in a resource block set indicated to be unavailable , the terminal may not receive the downlink signal or the entire channel. In an embodiment, the terminal may not receive the downlink signal or channel only for a region overlapping the resource block set indicated as unavailable among the downlink signals or channels.

In an embodiment, with respect to a resource block set indicated as available in a slot indicated by an uplink slot through a slot format indicator, the UE may use an uplink signal or channel in the indicated flexible resource block set, e.g. For example, at least one signal or channel among PUCCH, PUSCH, SRS, and PRACH configured to be transmitted in the flexible resource block set may be transmitted. With respect to the resource block set indicated as unavailable among the slots indicated by the uplink slot through the slot format indicator, the terminal is an uplink signal or channel in the indicated flexible resource block set, for example, the flexible resource At least one signal or channel among PUCCH, PUSCH, SRS, and PRACH configured to be transmitted in the block set may not be transmitted. In one embodiment, when some resources (eg, at least one PRB, or at least one of RE) among the configured uplink signals or channels overlap or are included in the resource block set indicated as unavailable, the terminal It may not transmit the link signal or the entire channel. In an embodiment, the terminal may not transmit the uplink signal or channel only for a region overlapping the resource block set indicated as unavailable among the uplink signals or channels.

In Table 20, K may be less than or equal to ^{2 N} -1, which is the number of cases required to provide indicator information for N resource block sets. Also, K may be the same as or less than ^{2 M} −1, which is the number of configuration information that can be indicated by the size (M bits) of a field indicating indicator information in the DCI. As an embodiment, the terminal may set or receive at least one value of M and K from the base station through a higher-order signal.

As an embodiment, information on the resource block set(s) indicated through each configuration (ie, RFI configuration) of Tables 19 to 20 is predefined between the base station and the terminal, or the terminal is provided through a higher-order signal from the base station or can be set.

For example, RFI configuration 2 (configuration) of Table 19 indicates that among N resource block sets configured by the UE through a higher signal from the base station, the first resource block set is DL (or UL), the second resource block set is X, … , and may indicate that the Nth resource block set is DL (or UL). For example, in RFI configuration 2 (configuration) of Table 20, among the N resource block sets configured by the UE through a higher signal from the base station, the first resource block set is capable of downlink reception or uplink transmission, and the second resource The block set is not capable of downlink reception or uplink transmission, ... , and the Nth resource block set may indicate that downlink reception or uplink transmission is possible.

It will be described in more detail with reference to the example of FIG. 16 as follows. Here, FIG. 16 shows uplink and downlink configuration in the frequency domain (eg, XDD-UL-DL-Configuration) and/or uplink and downlink configuration in the time domain through a higher layer signal from the base station (eg, For example, tdd-UL-DL-Configuration) is a diagram illustrating a method of determining time and frequency domain uplink and downlink configuration in a configured terminal. In FIG. 16, it is assumed that a terminal is configured with a downlink resource block set as shown in FIG. 13(a), an uplink resource block set as shown in FIG. 14(a), and a flexible resource block set as shown in FIG. 15. As shown in FIG.

The terminal may determine the time domain uplink and downlink configuration information by using at least one of the time domain uplink and downlink configuration information configured from the base station and the slot format indicator received through DCI. In FIG. 16, the UE transmits time domain uplink and downlink configuration information of slot n, slot n+1, slot n+2, and slot n+3 to a downlink slot, a downlink slot, a flexible slot, and an uplink, respectively. A case indicated by a slot is shown. For convenience of description, it is assumed that a downlink slot, a flexible slot, and an uplink slot are indicated in a unit of a slot, but unlike this, a downlink symbol, a flexible symbol, or an uplink symbol in a symbol unit within one slot Likewise, it will be applicable even when indicated as .

In the slot n and slot n+1 indicated by the downlink slot, the UE is based on the block set configuration information of the frequency domain resource for the downlink bandwidth part, the resource block set #0, the resource block set #1, and the resource block It is determined that set #2 is a downlink resource block set, a flexible resource block set, and a downlink resource block set, respectively.

For example, as shown in Method 2 and Table 19 described above, the UE determines whether the resource block set determined as the flexible resource block set is the downlink resource block set, or the uplink resource block through the indicator information in the DCI received from the base station. It can be determined whether it is a set or a flexible resource block set.

As another example, as shown in Method 2 and Table 20 described above, a resource block set determined as a flexible resource block set through indicator information in DCI received from a base station is a resource capable of downlink reception (or impossible). It is possible to determine whether it is a block set or whether the resource block set determined as a flexible resource block set is a resource block set in which uplink transmission is possible (or impossible).

At this time, it can be determined whether the indicator information is information applied to the downlink bandwidth part or information applied to the uplink bandwidth part based on the indication of the uplink and downlink configuration or the slot format indicator in the time domain. have. For example, in the uplink and downlink configuration or slot format indicator of the time domain in FIG. 16 , in slots n and n+1 that are configured or indicated to be downlink slots, the indicator information indicates configuration 2 of Table 19 , the terminal determines that the indicator information is information applied to the downlink bandwidth part, and among the resource block sets in the downlink bandwidth part, determines that the resource block set #2 is a flexible resource block set, or downlink It may be determined as a resource block set that does not receive a link signal or a channel. In this case, the resource block set #0 and the resource block set #1 may be determined to be downlink resource block sets.

As another example, in the slot n+2 configured or indicated as a flexible slot in the uplink and downlink configuration or the slot format indicator of the time domain in FIG. 16, when the indicator information indicates configuration 1 of Table 19 , the terminal may determine that the indicator information is applied to the flexible bandwidth part if the flexible bandwidth part is set. If the flexible bandwidth part is not set, the terminal may determine that the indicator information is information applied to the downlink bandwidth part.

When the terminal is not configured with a flexible bandwidth part, in slot n+2, the indicator information is the downlink bandwidth for a symbol configured to receive a downlink signal or channel (eg, PDCCH or CSI-RS reception). It is determined that it is applied to the part, and for a symbol (eg, at least one of SRS, PUCCH, PUSCH, and PRACH) configured to transmit an uplink signal or channel, it is determined that the indicator information is applied to the uplink bandwidth part. can

As an embodiment, the range of slots or symbols in which the indicator information is valid or persistent or remaining may be determined or determined as follows.

The UE determines that the indicator information is valid or continues from the first (or last) symbol of the PDCCH in which the DCI including the indicator information is transmitted or the first (or the last) symbol of the control resource set in which the PDCCH is transmitted. .

The terminal may determine that the indicator information is valid or continues until a slot or symbol corresponding to one of the following.

- Downlink slots or symbols configured or indicated according to uplink and downlink configuration or slot format indicator of the time domain.

- The first uplink slot or the symbol immediately before the first uplink slot or symbol configured or indicated according to the uplink and downlink configuration or slot format indicator of the time domain.

- Downlink slots to symbols and flexible slots to symbols configured or indicated according to uplink and downlink configuration or slot format indicator in the time domain.

- A symbol immediately before the first symbol of the next (subsequent) PDCCH or the next control resource set in which DCI including the following (subsequent) indicator information can be transmitted. Here, the following PDCCH or the following control resource set may be transmitted periodically.

17 is a flowchart illustrating that a terminal in a wireless communication system configures frequency domain resources for uplink transmission or downlink reception.

The control unit of the terminal checks one or more guard bands set in the frequency domain (1710). The frequency domain is, for example, a bandwidth of a cell or a bandwidth part configured in the terminal. The one or more guard bands may be predefined or selected from a plurality of frequency band ranges set through higher layer signaling.

The control unit of the terminal checks the set of one or more resource blocks in a resource region excluding the one or more guard bands within the bandwidth of the cell or the bandwidth part configured in the terminal (1720). This operation may be performed, for example, using the one or more guard bands. On the other hand, it is also possible to receive the resource block set without setting the guard band. In this case, the number of guard bands identified in step 1710 may be zero. The control unit of the terminal may check whether configuration information on the type of the resource block set has been provided (1730).

According to an embodiment of the present disclosure, the configuration information may be periodically provided, and the terminal may determine that the configuration information is valid until the next configuration information is provided.

When the configuration information is provided, the control unit of the terminal determines whether the type of each resource block set is a downlink resource block set, an uplink resource block set, or flexible (or for XDD) based on the configuration information. It is determined whether it is a resource block set (1740). If the configuration information is not provided, the control unit of the terminal determines the type of each resource block set based on whether the bandwidth or the bandwidth part is for the uplink transmission or the downlink reception. A block set, an uplink resource block set, or a flexible resource block set is determined (1750). In this case, it is determined that all of the one or more resource block sets are downlink resource block sets for a time section that is a downlink bandwidth or a downlink bandwidth part, and the one or more resources for a time section that is an uplink bandwidth or an uplink bandwidth part It may be determined that all block sets are uplink resource block sets, and in other cases, it may be determined that they are flexible resource block sets.

The control unit of the terminal may determine the specific frequency region of the one or more guard bands and the one or more resource block sets using predefined resource block set pattern information. In this case, the one or more guard bands and the resource block aggregation pattern may be defined according to a subcarrier interval and the size of the bandwidth or the bandwidth part.

The control unit of the terminal may receive downlink control information (DCI) from the base station through the communication unit. The control unit of the terminal is located in the resource block set determined as the flexible resource block set and based on a channel or a signal scheduled by the DCI, whether the resource block set determined as the flexible resource block set is used for downlink reception or uplink You can decide whether to use it for transmission. The channel or signal is a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), an aperiodic Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), or a Physical Random Access Channel (PRACH). It may include one or more of them.

The control unit of the terminal may determine whether the flexible resource block set scheduled in the DCI is a downlink resource block set or an uplink resource block set based on the indicator included in the DCI. The indicator may have a bitmap having the same size as the number of flexible resource block sets scheduled by DCI.

When the flexible resource block set scheduled by the DCI is included in the downlink bandwidth part, the control unit of the terminal may determine whether downlink reception is possible in the flexible block set based on the indicator included in the DCI. Alternatively, if the flexible resource block set scheduled by the DCI is included in the uplink bandwidth part, it may be determined whether uplink reception is possible in the flexible block set based on the indicator included in the DCI. The control unit of the terminal may perform downlink reception or uplink transmission according to the determination result.

18 is a flowchart in which a base station in a wireless communication system configures frequency domain resources for uplink reception or downlink transmission.

The control unit of the base station sets one or more guard bands set in the frequency domain to the terminal ( 1810 ). The frequency domain is, for example, a bandwidth of a cell or a bandwidth part configured in a terminal. The one or more guard bands may be selected from a plurality of predetermined frequency band ranges. On the other hand, it is also possible to receive the resource block set without setting the guard band. In this case, the number of guard bands identified in step 1810 may be zero.

The control unit of the base station sets one or more resource block sets to the terminal in a resource region excluding the one or more guard bands in the bandwidth of the cell or the bandwidth part configured in the terminal (1820). This operation may be performed, for example, using the one or more guard bands. The control unit of the base station may control the communication unit to provide configuration information on the type of resource block set to the terminal ( 1830 ).

The configuration information may include information for determining whether the type of each resource block set is a downlink resource block set, an uplink resource block set, or a flexible resource block set. The configuration information may be periodically provided to the UE, but may also be provided aperiodically. The configuration information may be considered valid until the next configuration information is provided.

The guard band may be predefined or selected from a plurality of frequency bands configured through higher layer signaling.

The base station may transmit downlink control information (DCI) to the UE through a communication unit. In this case, it may be determined whether the resource block set determined as the flexible resource block set is used for the downlink reception or the uplink transmission according to a channel or a signal scheduled by the DCI. The channel or signal may include one or more of a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), an aperiodic CSI-RS, SRS, or a Physical Random Access Channel (PRACH). Alternatively, the DCI may include an indicator for determining whether the flexible resource block set scheduled by the DCI is the downlink resource block set or the uplink resource block set.

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

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

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

In addition, the program accesses through a communication network composed of a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. It may be stored in an attachable storage device that can be accessed. Such a storage device may be connected to a device implementing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may be connected to the device implementing the embodiment of the present disclosure.

In the present disclosure, the term "computer program product" or "computer readable medium" refers to a medium such as a memory, a hard disk installed in a hard disk drive, and a signal as a whole. used for These "computer program products" or "computer-readable recording medium" may be used for frequency resource allocation in the wireless communication system according to the present disclosure.

In the specific embodiments of the present disclosure described above, elements included in the present disclosure are expressed in the singular or plural according to the specific embodiments presented. However, the singular or plural expression is selected as appropriate for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural component, and even if the component is expressed in plural, it may be composed of the singular and , or even a component expressed in a singular may be composed of a plural.

On the other hand, the embodiments of the present disclosure disclosed in the present specification and drawings are only presented as specific examples to easily explain the technical content of the present disclosure and help the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it will be apparent to those of ordinary skill in the art to which the present disclosure pertains that other modified examples can be implemented based on the technical spirit of the present disclosure. In addition, each of the above embodiments may be operated in combination with each other as needed. For example, an embodiment of the present disclosure and parts of another embodiment may be combined to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other modifications based on the technical spirit of the embodiments of the present disclosure may also be implemented. For example, embodiments of the present disclosure may be applied to an LTE system, a 5G or NR system, and the like.

Claims (18)

A method for a UE in a wireless communication system to configure a frequency domain resource for uplink transmission or downlink reception, the method comprising:
checking a guard band configured within a bandwidth of a cell or a bandwidth part configured in the UE;
identifying one or more resource block sets in a resource region other than the guard band within the bandwidth or the bandwidth part; and
Including the process of confirming whether configuration information for the type of resource block set has been provided,
When the configuration information is provided, it is determined whether the type of each resource block set is a downlink resource block set, an uplink resource block set, or a flexible resource block set, based on the configuration information,
When the configuration information is not provided, whether the type of each resource block set is a downlink resource block set based on whether the bandwidth or the bandwidth part is for the uplink transmission or the downlink reception; A method for a UE to configure a frequency domain resource for determining whether it is a resource block set for uplink or a flexible resource block set. According to claim 1,
The configuration information is periodically provided to the UE,
The configuration information is valid until the next configuration information is provided, characterized in that the UE configures frequency domain resources. According to claim 1,
A method for configuring a frequency domain resource by a UE, characterized in that the one or more resource block sets are identified by using the guard band. According to claim 1,
The guard band is predefined or selected from among a plurality of frequency bands configured through higher layer signaling, the UE configuring frequency domain resources. According to claim 1,
The method further comprises the step of determining a frequency domain of the guard band and the one or more resource block sets using predefined resource block set pattern information,
The one or more guard bands and the resource block aggregation pattern are defined according to a subcarrier interval and the size of the bandwidth or the size of the bandwidth part, wherein the UE configures frequency domain resources. According to claim 1,
If the configuration information is not provided, it is determined that all of the one or more resource block sets are the downlink resource block sets for a time interval that is a downlink bandwidth or a downlink bandwidth part, and the uplink bandwidth or the uplink bandwidth part A method for the UE to configure frequency domain resources, characterized in that it is determined that all of the one or more resource block sets are the uplink resource block sets for a time interval of . According to claim 1,
receiving downlink control information (DCI); and
Based on the channel or signal scheduled by the DCI in the resource block set determined as the flexible resource block set, the resource block set determined as the flexible resource block set is used for the downlink reception or the uplink transmission A method for the UE to configure frequency domain resources, characterized in that it further comprises the step of determining. 8. The method of claim 7,
The channel or signal includes at least one of a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), aperiodic CSI-RS, SRS, or a Physical Random Access Channel (PRACH). How to set up frequency domain resources. According to claim 1,
receiving DCI; and
The method further comprises the step of determining whether the flexible resource block set scheduled by the DCI is the downlink resource block set or the uplink resource block set based on the indicator included in the DCI,
The indicator indicates that each of a bitmap having the same size as the number of flexible resource block sets scheduled in the DCI or at least one flexible resource block set included in one of an uplink or downlink cell, a carrier, or a bandwidth part is a downlink resource. A method for configuring a frequency domain resource by a UE, comprising indicator information indicating one of a block set, a flexible resource block set, and an uplink resource block set. According to claim 1,
receiving DCI;
if the flexible resource block set scheduled by the DCI is included in the downlink bandwidth part, determining whether the downlink reception is possible in the flexible block set based on the indicator included in the DCI; and
When the flexible resource block set scheduled in the DCI is included in the uplink bandwidth part, the method further comprising the step of determining whether the uplink transmission is possible in the flexible block set based on the indicator included in the DCI, How the UE configures frequency domain resources. A method for a base station in a wireless communication system to configure a frequency domain resource for uplink reception or downlink transmission, the method comprising:
setting a guard band to the UE within a bandwidth of a cell or a bandwidth part configured in the UE;
setting one or more resource block sets to the UE in a resource region other than the guard band within the bandwidth or the bandwidth part; and
Comprising the process of providing configuration information on the type of resource block set to the UE,
The configuration information includes information for determining whether the type of each resource block set is a downlink resource block set, an uplink resource block set, or a flexible resource block set. How to set up. 12. The method of claim 11,
The configuration information is periodically provided to the UE,
The method for configuring a frequency domain resource by a base station, characterized in that the configuration information is valid until the next (subsequent) configuration information is provided. 12. The method of claim 11,
The guard band is predefined or selected from a plurality of frequency bands configured through higher layer signaling, wherein the base station configures frequency domain resources. 12. The method of claim 11,
The method further comprises transmitting downlink control information (DCI) to the UE,
The base station is characterized in that it is determined whether the resource block set determined as the flexible resource block set is used for the downlink reception or the uplink transmission according to a channel or a signal scheduled by the DCI. How to set up resources. 15. The method of claim 14,
The channel or signal includes at least one of a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), aperiodic CSI-RS, SRS, or a Physical Random Access Channel (PRACH). How to set up frequency domain resources. 12. The method of claim 11,
Further comprising the step of transmitting DCI to the UE,
The DCI, characterized in that it includes an indicator for determining whether the flexible resource block set scheduled in the DCI is the downlink resource block set or the uplink resource block set, the base station uses frequency domain resources How to set up. In a UE for configuring a frequency domain resource for uplink transmission or downlink reception in a wireless communication system,
The UE includes a communication unit and a control unit,
The control unit identifies a guard band configured within a bandwidth of a cell or a bandwidth part configured in the UE, and identifies one or more resource block sets in a resource region other than the guard band within the bandwidth or the bandwidth part, and sets a resource block set Check that the setting information for the type of
When the configuration information is provided through the communication unit, the controller is configured to determine whether a type of each resource block set is a downlink resource block set, an uplink resource block set, or a flexible resource based on the configuration information. Determine whether it is a block set,
When the configuration information is not provided, whether the type of each resource block set is a downlink resource block set based on whether the bandwidth or the bandwidth part is for the uplink transmission or the downlink reception; A UE that determines whether it is a resource block set for uplink or a flexible resource block set. In a base station for setting a frequency domain resource for uplink reception or downlink transmission in a wireless communication system,
The base station includes a communication unit and a control unit,
The control unit sets a guard band to the UE within a bandwidth of a cell or a bandwidth part configured in the UE, and sets one or more resource block sets to the UE in a resource region excluding the guard band within the bandwidth or the bandwidth part, , to provide configuration information for the type of resource block set to the UE,
The configuration information includes information for determining whether the type of each resource block set is a downlink resource block set, an uplink resource block set, or a flexible resource block set.

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