Method and apparatus for transmitting and receiving a paging in a wireless communication system

Abstract

The disclosure relates to a kind of for supporting higher data transmission rate compared with fourth generation (4G) communication system such as long term evolution (LTE) system fifth generation (5G) or quasi-5G communication system. According to various embodiments of the disclosure, a method for paging in a wireless communication system by a UE includes receiving configuration information from a base station, the configuration information including at least one of information on a control resource set and information on a search space related to a PDCCH for paging, identifying a synchronization signal block (SSB) corresponding to a PDCCH monitoring occasion among the control resource set and the search space set based on the configuration information, and performing PDCCH monitoring for paging using the same reception beam as used when receiving the synchronization signal block (SSB), and receiving a paging message on a PDSCH scheduled by the PDCCH.

Description

Technical Field

[0001] This disclosure generally relates to wireless communication systems, and more specifically, to an apparatus and method for performing paging in a wireless communication system. Background Technology

[0002] To meet the soaring demand for wireless data services since the introduction of 4G communication systems, efforts have been made to develop enhanced 5G or near-5G communication systems. For various reasons, 5G or near-5G communication systems are referred to as beyond 4G network communication systems or post-Long Term Evolution (LTE) systems.

[0003] To achieve higher data transmission rates, 5G communication systems are considered for implementation in ultra-high frequency bands (mmWave), such as 60 GHz. To mitigate path loss in the mmWave band and increase the reach of radio waves, the following technologies are considered for 5G communication systems: beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO.

[0004] Additionally, various technologies are being developed for 5G communication systems with enhanced networks such as: evolved or advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), and interference cancellation.

[0005] There are also various other schemes being developed for 5G systems, including, for example, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding and modulation (ACM) schemes, and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access schemes.

[0006] The Internet is evolving from a human-centric network of connections used by humans to create and consume information to an Internet of Things (IoT) network used to transfer and process information between things or other distributed components. Another emerging technology is the Internet of Everything (IoE), which is a combination of big data processing and IoT technologies connected, for example, to cloud servers. To realize the IoT, technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required. Recent research is focused on inter-object connectivity technologies such as sensor networks, machine-to-machine (M2M), or machine-type communication (MTC). Intelligent Internet Technology (IT) services can be provided in the IoT environment, collecting and analyzing data generated by interconnected things to create new value for human life. Through the transformation or integration of existing information technology (IT) technologies and various industries, the IoT can have a wide range of applications such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, or the smart appliance industry, or existing levels of medical services.

[0007] Therefore, there are various ongoing efforts to apply 5G communication systems to IoT networks. For example, solutions such as beamforming, multiple-input multiple-output (MIMO), and array antenna schemes are being used to implement sensor networks, machine-to-machine (M2M), machine-type communication (MTC), or other 5G technologies. The cloud radio access network (RAN) mentioned above, as an application of big data processing technology, can be seen as an example of the convergence of 5G and IoT technologies. Summary of the Invention

[0008] Technical issues

[0009] This disclosure provides an apparatus and method for efficiently performing paging in a wireless communication system.

[0010] This disclosure provides an apparatus and method for efficiently performing paging in a wireless communication system by configuring various configuration information for PDCCH monitoring.

[0011] Technical solution

[0012] According to embodiments of this disclosure, a method performed by a UE configured to receive paging in a wireless communication system includes: receiving configuration information from a base station, the configuration information including at least one of information about a control resource set and information about a search space related to a physical downlink control channel (PDCCH) for the paging; identifying a synchronization signal block (SSB) corresponding to a PDCCH listening opportunity in the control resource set and the search space based on the configuration information; performing PDCCH listening for the paging using the same receiving beam as when receiving the synchronization signal block (SSB), and receiving a paging message on a physical downlink shared channel (PDSCH) scheduled through the PDCCH.

[0013] Furthermore, according to embodiments of this disclosure, a UE in a wireless communication system includes: a transceiver; and a processor configured to: receive configuration information from a base station via the transceiver, the configuration information including at least one of information about a control resource set and information about a search space related to a PDCCH for paging; identify a synchronization signal block (SSB) corresponding to a PDCCH listening opportunity in the control resource set and the search space based on the configuration information; perform PDCCH listening for paging using the same receiving beam as used when receiving the synchronization signal block (SSB), and receive a paging message on a PDSCH scheduled via the PDCCH.

[0014] Furthermore, according to embodiments of this disclosure, a method performed by a base station configured to transmit paging in a wireless communication system includes: transmitting configuration information, the configuration information including at least one of information about a control resource set and information about a search space related to a PDCCH used for paging; identifying a synchronization signal block (SSB) corresponding to a PDCCH listening time in the control resource set and the search space based on the configuration information; and performing PDCCH transmission and PDSCH transmission for paging using the same transmission beam used when transmitting the synchronization signal block (SSB).

[0015] Furthermore, according to embodiments of this disclosure, a base station in a wireless communication system includes: a transceiver; and a processor configured to: transmit configuration information, the configuration information including at least one of information about a control resource set and information about a search space related to a PDCCH for paging; identify a synchronization signal block (SSB) corresponding to a PDCCH listening time in the control resource set and the search space based on the configuration information; and perform PDCCH transmission and PDSCH transmission for paging using the same transmission beam used when transmitting the synchronization signal block (SSB). Attached Figure Description

[0016] Figure 1 Wireless communication systems according to various embodiments of the present disclosure are shown;

[0017] Figure 2 The configuration of a base station in a wireless communication system according to various embodiments of the present disclosure is shown;

[0018] Figure 3 The configuration of a UE in a wireless communication system according to various embodiments of the present disclosure is illustrated;

[0019] Figure 4 This is a flowchart of a UE in a wireless communication system according to various embodiments of the present disclosure;

[0020] Figure 5 The resource structure of a wireless communication system according to various embodiments of the present disclosure is shown;

[0021] Figure 6 The resource structure of a wireless communication system according to various embodiments of the present disclosure is shown;

[0022] Figure 7 The structure of the bandwidth portion in a wireless communication system according to various embodiments of the present disclosure is shown;

[0023] Figure 8 The structure of the control resource set in a wireless communication system according to various embodiments of the present disclosure is shown;

[0024] Figure 9 The resource structure in a wireless communication system according to various embodiments of the present disclosure is illustrated;

[0025] Figure 10 The process of discontinuous reception (DRX) in a wireless communication system according to various embodiments of the present disclosure is illustrated;

[0026] Figure 11 The paging process in a wireless communication system according to various embodiments of the present disclosure is illustrated;

[0027] Figure 12 The paging process in a wireless communication system according to various embodiments of the present disclosure is illustrated;

[0028] Figure 13 Base station beam allocation based on TCI state in a wireless communication system according to various embodiments of the present disclosure is illustrated;

[0029] Figure 14 The process of layered signaling in a wireless communication system according to various embodiments of the present disclosure is illustrated;

[0030] Figure 15 Examples of signaling structures in wireless communication systems according to various embodiments of the present disclosure are shown;

[0031] Figure 16 The paging process in a wireless communication system according to various embodiments of the present disclosure is illustrated; and

[0032] Figure 17a and Figure 17b The operation of a base station and a UE according to various embodiments of the present disclosure is illustrated. Detailed Implementation

[0033] The terminology used herein is provided merely to describe some embodiments thereof and does not limit the scope of other embodiments of this disclosure. It should be understood that the singular form includes plural references unless the context clearly specifies otherwise. The terminology used herein, including technical and scientific terms, has the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this disclosure pertain. It will be further understood that terms such as those defined in common dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. In some cases, the terms defined herein may be interpreted to exclude embodiments of this disclosure.

[0034] The methods described below, together with the embodiments, are hardware-based. However, embodiments of this disclosure include techniques using both hardware and software, and therefore software-based methods are not excluded.

[0035] It should be understood that combinations of blocks and flowcharts in the accompanying drawings can be executed by computer program instructions. Since computer program instructions can be equipped in the processor of a general-purpose computer, special-purpose computer, or other programmable data processing device, the instructions, which execute through the processor of the computer or other programmable data processing device, generate means for performing the functions described together with the blocks of each flowchart. Since the computer program instructions can be stored in a computer-usable or computer-readable storage device that can implement the functions in a specified manner for use with a computer or other programmable data processing device, the instructions stored in the computer-usable or computer-readable storage device can produce a product including instruction means for performing the functions described together with the blocks in each flowchart. Since computer program instructions can be equipped in a computer or other programmable data processing device, a process executed by a computer is generated by performing a series of operational steps on the computer or other programmable data processing device, and the instructions operating the computer or other programmable data processing device can provide steps for performing the functions described together with the blocks in each flowchart.

[0036] Furthermore, each block can represent a module, segment, or portion of code comprising one or more executable instructions for performing a specified logical function. It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur in different orders. For example, depending on the corresponding functions, two blocks shown consecutively may be executed substantially simultaneously or in reverse order.

[0037] As used herein, the term "cell" refers to a software element or a hardware element such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC). A cell plays a specific role. However, the term "cell" is not limited to referring to a software element or a hardware element. A "cell" can be configured in an addressable storage medium or can be configured to reproduce one or more processors. Thus, by way of example, a "cell" includes elements such as: software elements, object-oriented software elements, class elements and task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data schemas, tables, arrays, and variables. The functionality provided in an element or "cell" can be combined with additional elements or can be divided into sub-elements or sub-cells. Furthermore, an element or "cell" can be implemented to reproduce one or more CPUs in a device or secure multimedia card. According to embodiments, "...cell" can include one or more processors.

[0038] Wireless communication systems have evolved from voice-centric services to broadband wireless communication systems that provide high data rates and high-quality packet data services, such as the 3GPP High-Speed ​​Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A), LTE-pro, 3GPP2 High-Speed ​​Packet Data (HRPD), Ultra Mobile Broadband (UMB), and the IEEE 802.16e communication standard.

[0039] As a representative example of a wireless communication system, LTE employs Orthogonal Frequency Division Multiplexing (OFDM) for the downlink and Single-Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink. The uplink refers to the radio link through which a User Equipment (UE) (or Mobile Station (MS)) transmits data or control signals to a Base Station (BS or eNode B), while the downlink refers to the radio link through which the Base Station transmits data or control signals to the UE. This multiple access scheme typically allocates and operates time-frequency resources carrying data or control information according to users to ensure non-overlapping, i.e., to maintain orthogonality, thereby distinguishing the data or control information for each user.

[0040] Post-LTE communication systems (e.g., 5G communication systems) are required to freely reflect the diverse needs of users and service providers, thereby supporting services that simultaneously meet various requirements. Services considered for 5G communication systems include, for example, enhanced mobile broadband (eMBB), massive machine-type communications (MMTC), and ultra-reliable low-latency communications (URLLC).

[0041] The purpose of eMBB is to provide further enhanced data transmission rates compared to LTE, LTE-A, or LTE-pro. For example, for a single base station, eMBB for a 5G communication system needs to provide a peak data rate of 20Gbps on the downlink and 10Gbps on the uplink. 5G communication systems also need to provide improved user-perceived data rates while simultaneously delivering these peak data rates. To meet these requirements, various transmit (TX) / receive (RX) technologies and multiple-input multiple-output (MIMO) are needed to be further enhanced. While LTE uses up to 20MHz of TX bandwidth to transmit signals in the 2GHz band, 5G communication systems employ a wider frequency bandwidth ranging from 3GHz to 6GHz or above to meet the data rates required by 5G communication systems.

[0042] mMTC is also considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently deliver IoT, mMTC is required to support a massive number of UEs in a cell, enhance UE coverage and battery life, and reduce UE costs. IoT terminals are attached to various sensors or devices to provide communication functions; therefore, it needs to support many UEs per cell (e.g., 1,000,000 UEs / km). 2 Since UEs supporting mMTC are likely to be located in shadow areas not covered by the cell (such as underground in buildings) by the nature of their service, they may require a wider coverage area compared to other services provided by 5G communication systems. Due to the need for low cost and the difficulty in frequently replacing batteries, UEs supporting mMTC may be required to have a long battery life, for example, 10 to 15 years.

[0043] URLLC is a mission-critical, cellular-based wireless communication service. For example, URLLC can be considered for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote healthcare, or emergency alerts. This requires URLLC to provide very low latency and very high reliability communication. For example, services supporting URLLC need to be 7... 5This requires simultaneously meeting air interface latency of less than 0.5 milliseconds with an even lower packet error rate. Therefore, for services supporting URLLC, 5G communication systems may be required to provide shorter transmission time intervals (TTIs) than those used for other services, while ensuring reliable communication links through the allocation of wide resources in the frequency band.

[0044] The three 5G services mentioned above—eMBB, URLLC, and mMTC—can be reused and transmitted within a single system. In this case, different TX / RX schemes and TX / RX parameters can be used to meet their different requirements. Of course, 5G is not limited to these three services.

[0045] The description of embodiments in this disclosure focuses primarily on radio access networks, new RANs (NRs), and core networks, including packet cores (5G systems, or 5G core networks, or NG cores, or next-generation cores), as specified by the Third Generation Partnership Project (3GPP), a mobile communications standards organization. However, the subject matter of this disclosure, or minor variations thereof, can be applied to other communication systems sharing a similar technical background without departing from the scope of this disclosure, as will be readily understood by those skilled in the art.

[0046] For ease of description, some terms or names defined in the 3GPP standards (standards for 5G, New Radio (NR), Long Term Evolution (LTE), or similar systems) may be used. However, this disclosure is not limited to such terms and names and can be equally applied to systems conforming to other standards. As used herein, for ease of description, terms for identifying access nodes, terms for representing network entities, terms for representing messages, terms for representing interfaces between network entities, and terms for representing individual identification information are provided as examples. Therefore, this disclosure is not limited to terminology, and such terms may be replaced with other terms for representing objects having equivalent technical concepts.

[0047] Figure 1 Wireless communication systems according to various embodiments of the present disclosure are shown.

[0048] Figure 1 Base station 110 and UEs 120 and 130 are illustrated as nodes using a wireless channel in a wireless communication system. Although in Figure 1 The diagram shows only one base station, but it may also include other base stations that are the same as or similar to base station 110.

[0049] Base station 110 is the network infrastructure that provides radio access to UEs 120 and 130. Base station 110 has a coverage area defined by the distance at which it can transmit signals, which is a certain geographical area. Base station 110 may be referred to by other terms such as "access point (AP)," "eNodeB (eNB)," "fifth-generation (5G) node," "next-generation node B (gNB)," "radio point," or "transmit / receive point (TRP)," or by various other terms with equivalent technical meanings.

[0050] Each of UEs 120 and 130 is a device used by a user, and UE 120 and base station 110 communicate via a radio channel using optimal transmit / receive beam pairs 121 and 112. UE 130 and base station 110 communicate via a radio channel using optimal transmit / receive beam pairs 131 and 113. Each of UEs 120 and 130 may also be referred to by other terms such as user equipment (UE), mobile station, subscriber station, remote terminal, wireless terminal, user equipment, or by various other terms having equivalent technical meaning. In some cases, at least one of UEs 120 and UE 130 can operate without user involvement. In this case, at least one of UEs 120 and UE 130 may be a device performing machine-type communication (MTC) and may not be carried by a user.

[0051] Figure 2 The configuration of a base station in a wireless communication system according to various embodiments of the present disclosure is shown.

[0052] Can Figure 2 The configuration shown is understood as the configuration of base station 110. Furthermore, as used herein, the terms “…unit” and the suffix “…device” refer to a unit that processes at least one function or operation and is implemented in hardware, software, or a combination thereof.

[0053] Reference Figure 2 The base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230, and a controller 240.

[0054] The wireless communication unit 210 performs functions for transmitting / receiving signals via a wireless channel. For example, the wireless communication unit 210 performs the function of converting between baseband signals and bitstreams according to the system physical layer specifications. For example, during data transmission, the wireless communication unit 210 encodes and modulates the transmitted bitstream to generate composite symbols. Furthermore, during data reception, the wireless communication unit 210 reconstructs the received bitstream by demodulating and decoding the baseband signals.

[0055] Furthermore, wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal and transmits the converted signal via an antenna, while wireless communication unit 5310 down-converts the RF band signal received via the antenna into a baseband signal. For this purpose, wireless communication unit 210 may include, for example, 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). Wireless communication unit 210 may include multiple transmit / receive paths. Additionally, wireless communication unit 210 may include at least one antenna array composed of multiple antenna elements.

[0056] In terms of hardware, the wireless communication unit 210 can be configured with either a digital unit or an analog unit, and the analog unit can be composed of multiple sub-units depending on the operating power and operating frequency. The digital unit can be implemented as at least one processor (e.g., a digital signal processor (DSP)).

[0057] The wireless communication unit 210 transmits and receives signals as described above. Therefore, all or part of the wireless communication unit 210 may be referred to as a "transmitter," a "receiver," or a "transceiver." Furthermore, in the following description, transmission and reception performed via a wireless channel may also refer to the process performed by the wireless communication unit 210.

[0058] The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. In other words, the backhaul communication unit 220 can convert bit strings sent from a base station to another node (e.g., another access node, another base station, an upper-layer node, or the core network) into physical signals and convert physical signals received from another node into bit streams.

[0059] Storage unit 230 stores basic programs, application programs, configuration information, or other data used to operate the base station. Storage unit 230 can be configured as volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. Storage unit 230 provides the stored data according to requests from controller 240.

[0060] Controller 240 controls the overall operation of the base station according to embodiments of this disclosure described below. For example, controller 240 transmits and receives signals via wireless communication unit 210 or backhaul communication unit 220. Controller 240 records data in and reads data from storage unit 230. Controller 240 can perform the functions of the protocol stack required in the communication specification. According to another implementation example, the protocol stack may be included in wireless communication unit 210. For this purpose, controller 240 may include at least one processor.

[0061] Figure 3The configuration of a UE in a wireless communication system according to various embodiments of the present disclosure is shown.

[0062] Can Figure 3 The configuration shown is understood to be the configuration of UE 120. Furthermore, as used herein, the terms “…unit” and the suffix “…device” refer to a unit that processes at least one function or operation and is implemented in hardware, software, or a combination thereof.

[0063] Reference Figure 3 The UE includes a communication unit 310, a storage unit 320, and a controller 330.

[0064] Communication unit 310 performs functions for transmitting / receiving signals via a wireless channel. For example, communication unit 310 performs conversion between baseband signals and bitstreams according to the system physical layer specifications. For instance, during data transmission, communication unit 310 encodes and modulates the transmitted bitstream to generate composite symbols. Furthermore, during data reception, communication unit 310 reconstructs the received bitstream by demodulating and decoding the baseband signal. Additionally, communication unit 310 up-converts the baseband signal into an RF band signal and transmits the converted signal via an antenna, while wireless communication unit 210 down-converts the RF band signal received via the antenna back into a baseband signal. For example, communication unit 310 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC.

[0065] Communication unit 310 may include multiple transmit / receive paths. Furthermore, communication unit 310 may include at least one antenna array composed of multiple antenna elements. In terms of hardware, communication unit 310 may be configured with digital and analog circuitry (e.g., radio frequency integrated circuits (RFICs)). Here, digital and analog circuitry can be implemented in a single package. Communication unit 310 may include multiple RF chains. Furthermore, communication unit 310 may perform beamforming.

[0066] The communication unit 310 transmits and receives signals as described above. Therefore, all or part of the communication unit 310 may be referred to as a "transmitter," a "receiver," or a "transceiver." Furthermore, in the following description, transmission and reception performed via a wireless channel may also refer to the process described above being performed by the communication unit 310.

[0067] Storage unit 320 stores basic programs, application programs, configuration information, or other data used to operate the UE. Storage unit 320 can be configured as volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. Storage unit 320 provides the stored data upon request from controller 330.

[0068] The controller 330 controls the overall operation of the UE according to embodiments of this disclosure described below. For example, the controller 330 transmits and receives signals via the communication unit 310. The controller 330 records data in and reads data from the storage unit 320. The controller 330 can perform the functions of the protocol stack required in the communication specification. For this purpose, the controller 330 may include at least one processor or microprocessor, or may be a portion of a processor. The communication unit 310 and portions of the controller 330 may be referred to as a communication processor (CP).

[0069] Figure 4 This is a flowchart of a UE in a wireless communication system according to various embodiments of the present disclosure. Figure 4 The operation method of UE120 is shown.

[0070] Reference Figure 4 In operation 401, the UE receives a Physical Downlink Control Channel (PDCCH) configured with a Paging-Radio Network Temporary Identifier (P-RNTI) at a configured paging timing. The paging procedure can be used to indicate the presence of an incoming call to a UE in an idle or inactive state, and to indicate that network access for the UE has commenced or to notify a UE in a connected state that system information has changed. In the inactive state, the UE has an established RRC connection, and the UE-specific DRX can be configured by a higher layer or the RRC layer. The UE can listen to the paging channel and perform neighbor cell measurements and cell (re)selection.

[0071] Simultaneously, the base station transmits paging (messages) to the UE from the Access and Mobility Management Function (AMF), which performs paging control and mobility control for the UE in the core network. More specifically, paging is initiated by the AMF and transmitted to the base station via S1 Application Protocol (S1AP) signaling, and then to the UE via RRC signaling. In this scenario, the UE can determine whether a paging message exists by listening to the PDCCH configured with P-RNTI at the paging timing. The paging timing can be determined based on the DRX period set by the base station to the UE.

[0072] In operation 402, the UE receives a paging message including the UE's identifier on the Physical Downlink Shared Channel (PDSCH) based on the PDCCH. A UE that has received (detected) a PDCCH transmission configured with a P-RNTI can receive the paging message on the PDSCH. The paging message may include UE identifier (UE ID) information about the UE that will be woken up by the base station.

[0073] The frame structure of the 5G system is described in more detail below with reference to the accompanying drawings.

[0074] Figure 5 Resource structures of wireless communication systems according to various embodiments of the present disclosure are illustrated. Specifically, Figure 5 The basic time-frequency domain structure of a radio resource area, which serves as a data or control channel in a 5G system, is shown.

[0075] exist Figure 5 In this diagram, the horizontal axis refers to the time domain, while the vertical axis refers to the frequency domain. The basic unit of resources in both the time and frequency domains is a resource element (RE) 501, which can be defined by an orthogonal frequency division multiplexing (OFDM) symbol 502 on the time axis and a subcarrier 503 on the frequency axis. In the frequency domain, (For example, 12 consecutive REs can constitute a resource block (RB) 504. In Figure 5 middle, This refers to the number of OFDM symbols per subframe of 510 for the subcarrier spacing setting (μ). For a more detailed description of the resource structures used in 5G systems, refer to Section 4 of TS 38.211.

[0076] Figure 6 Resource structures of wireless communication systems according to various embodiments of the present disclosure are illustrated. Specifically, Figure 6 The time slot structure considered in a 5G system is shown.

[0077] Figure 6 An example structure of frame 600, subframe 601, and time slot 602 is shown. A frame 600 can be defined as 10 ms. A subframe 601 can be defined as 1 ms; therefore, a frame 600 can consist of a total of 10 subframes 601. A time slot 602 or 603 can be defined as 14 OFDM symbols (i.e., the number of symbols per time slot (...)). =14). A subframe 601 may consist of one or more time slots 602 and 603, and the number of time slots 602 and 603 in each subframe 601 may vary depending on μ (604 or 605), which is the setting value of the subcarrier spacing.

[0078] Figure 6 Examples of subcarrier spacing settings μ=0 (604) and μ=1 (605) are shown. When μ=0 (604), a subframe 601 can consist of one time slot 602, while when μ=1 (605), a subframe 601 can consist of two time slots (603). In other words, depending on the set subcarrier spacing value μ, the number of time slots per subframe ( The number of time slots per frame can vary, therefore, the number of time slots per frame ( The values ​​can differ. Based on the subcarrier spacing μ, they can be defined in Table 1 below. and .

[0079] [Table 1]

[0080]

[0081] The configuration of the bandwidth portion (BWP) in a 5G communication system is described in detail below with reference to the accompanying drawings.

[0082] Figure 7 The structure of the bandwidth portion in a wireless communication system according to various embodiments of the present disclosure is shown. Specifically, Figure 7 This is a view showing an example of the configuration for the bandwidth portion of a 5G communication system.

[0083] Figure 7 An example is shown where the UE bandwidth 700 is divided into two bandwidth portions (e.g., bandwidth portion #1 (BWP #1) 701 and bandwidth portion #2 (BWP #2) 702). The base station can configure one or more bandwidth portions in the UE, and for each bandwidth portion, the information shown in Table 2 below can be configured.

[0084] [Table 2]

[0085]

[0086] In Table 2, “locationAndBandwidth” indicates the location and bandwidth of the corresponding bandwidth portion in the frequency domain, “cyclicPrefix” indicates whether an extended cyclic prefix (CP) is used for the bandwidth portion, and “subcarrierSpacing” indicates the subcarrier spacing to be used in the bandwidth portion.

[0087] The various embodiments disclosed herein are not limited to these, and various other BWP-related parameters besides the configuration information described above can be configured in the UE. The base station can transmit information to the UE via higher-layer signaling (e.g., Radio Resource Control (RRC) signaling). At least one of one or more configured bandwidth portions can be activated. Whether to activate a configured bandwidth portion can be transmitted from the base station to the UE semi-statically via RRC signaling or dynamically via downlink control information (DCI).

[0088] According to an embodiment, prior to Radio Resource Control (RRC) connection, the base station can configure an Initial Bandwidth Part (BWP) for initial access to the UE via the Master Information Block (MIB). More specifically, during the initial access phase, the UE can receive configuration information of the search space and control resource set (CORESET) that can transmit the Physical Downlink Control Channel (PDCCH) via the MIB to receive the system information necessary for initial access (remaining system information, RMSI, or system information block 1 that can correspond to SIB1). The control resource set (CORESET) and search space configured via the MIB can be considered as identifier (ID) 0. The control resource set and search space configured via the MIB can be a common control resource set and a common search space, respectively. The base station can provide the UE with configuration information for control resource set #0 via the MIB, such as frequency allocation information, time allocation information, and parameter set (numerology). In addition, the base station can provide the UE with configuration information for the paging timing and listening period of control resource set #0 via the MIB, i.e., configuration information for search space #0. The UE can consider the frequency range obtained from the MIB and set to control resource set #0 as the initial BWP for initial access. In this case, the identifier (ID) of the initial BWP can be regarded as 0.

[0089] The bandwidth configurations supported in the aforementioned 5G can be used for various purposes.

[0090] According to an embodiment, when the bandwidth supported by the UE is less than the system bandwidth, this can be supported through bandwidth portion configuration. For example, when the base station configures the frequency position of the bandwidth portion for the UE, the UE can send / receive data at a specific frequency position within the system bandwidth.

[0091] According to an embodiment, to support different parameter sets, the base station can configure multiple bandwidth portions for the UE. For example, to support data transmission / reception using 15kHz and 30kHz subcarrier intervals for a particular UE, the base station can configure two bandwidths for that UE as 15kHz and 30kHz subcarrier intervals. Different bandwidth portions can be frequency-division multiplexed, and when transmitting / receiving data at a specific subcarrier interval, the bandwidth portion configured for that subcarrier interval can be activated.

[0092] According to an embodiment, to reduce the power consumption of the UE, the base station can configure bandwidth portions with different bandwidth sizes for the UE. For example, significant power consumption may occur when the UE supports bandwidths exceeding a very large bandwidth (e.g., 100 MHz) and always uses that bandwidth to send / receive data. In particular, using a large bandwidth of 100 MHz to listen to unnecessary downlink control channels in the absence of service is very inefficient in terms of power consumption. To reduce the power consumption of the UE, the base station can configure a relatively small bandwidth portion for the UE, for example, a bandwidth portion of 20 MHz. In the absence of service, the UE can perform listening in the 20 MHz bandwidth, and if data is available, the UE can send / receive data in the 100 MHz bandwidth according to instructions from the base station.

[0093] In the method for configuring the bandwidth portion, the UE prior to RRC connection can receive initial bandwidth configuration information via the Master Information Block (MIB) during the initial access phase. More specifically, the UE can be configured with a control resource set (CORESET) for a downlink control channel, in which downlink control information (DCI) of the Scheduled System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control resource set configured via the MIB can be considered as the initial bandwidth portion, and the UE can receive the Physical Downlink Shared Channel (PDSCH) for transmitting the SIB via the configured initial bandwidth portion. The initial bandwidth portion can be used for other System Information (OSI), paging and random access, and for receiving SIBs.

[0094] If the UE is configured with one or more bandwidth portions, the base station can use a bandwidth portion indicator in the DCI to indicate changes in the bandwidth portion to the UE. For example, when the UE's currently active bandwidth portion is... Figure 7 When the bandwidth portion #1 701 is in the DCI, the base station can use the bandwidth portion indicator in the DCI to indicate the bandwidth portion #2 702 to the UE, and the UE can change the bandwidth portion to the bandwidth portion #2 702 indicated by the bandwidth portion indicator in the received DCI.

[0095] As described above, since DCI-based bandwidth portion changes can be indicated by the DCI scheduling of the Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH), the UE, upon receiving a bandwidth portion change request, should be able to receive or transmit the DCI-scheduled PDSCH or PUSCH within the changed bandwidth portion without difficulty. For this purpose, the standard specifies the required delay time T when changing the bandwidth portion. BWP The requirements can be defined as shown in Table 3 below.

[0096] [Table 3]

[0097]

[0098] The latency requirement for bandwidth portion variations depends on the UE's capability to support either Type 1 or Type 2. The UE can report the supported bandwidth portion latency time type to the base station.

[0099] If the UE receives a DCI in time slot n, including a bandwidth portion variation indicator as required by the aforementioned requirement regarding the delay time for bandwidth portion variation, then the UE can proceed no later than time slot n+T. BWP The time required to complete the change of the new bandwidth portion indicated by the bandwidth portion change indicator is determined, and transmission / reception can be performed on the data channel scheduled by the DCI in the changed new bandwidth portion. When scheduling the data channel in the new bandwidth portion, the base station can take into account the UE's bandwidth portion change delay time T. BWP This is used to determine the temporal resource allocation for the data channel. In other words, when scheduling a data channel with a new bandwidth portion, in the method for determining the temporal resource allocation for the data channel, the base station can schedule the corresponding data channel after the bandwidth portion change delay time. Therefore, the UE may not expect the DCI indication indicating the bandwidth portion change to be delayed by the bandwidth portion change delay time T. BWP Small time slot offset (K0 or K2).

[0100] If the UE has received a DCI indicating a partial bandwidth change (e.g., DCI format 1_1 or 0_1), the UE may refrain from transmitting or receiving for a period from the third symbol of the slot in which the DCI was received (including the third symbol) to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, if the UE receives a DCI indicating a partial bandwidth change in slot n, and the slot offset value indicated by the DCI is K, the UE may refrain from transmitting or receiving from the third symbol of slot n to the symbols preceding slot n+K (i.e., the last symbol of slot n+K-1).

[0101] Next, the Synchronization Signal (SS) / PBCH block (i.e., Synchronization Signal Block (SSB)) in 5G will be described.

[0102] The SS / PBCH block can refer to a physical layer channel block consisting of the primary SS (PSS), secondary SS (SSS), and physical broadcast channel (PBCH). Specifically, the configuration of the SS / PBCH block is as follows.

[0103] PSS: A signal used as a reference for downlink time / frequency synchronization and providing part of the cell ID information.

[0104] SSS: Used as a reference for downlink time / frequency synchronization and provides the remainder of the cell ID information not provided by PSS. Additionally, it can be used as a reference signal for demodulation of PBCH.

[0105] PBCH: Provides the necessary system information required for the UE to transmit and receive data and control channels. This necessary system information may include radio resource mapping information indicating the control channels and search space-related control information for scheduling control information of separate data channels used to transmit system information.

[0106] An SS / PBCH block consists of a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks can be sent within 5 ms, and each sent SS / PBCH block can be distinguished by an index.

[0107] During the initial access phase, the UE can detect the PSS and SSS and decode the PBCH. The UE can obtain the MIB from the PBCH and is thus configured with a Control Resource Set (CORESET) #0 (which may correspond to its Control Resource Set Index or the Control Resource Set with ID 0) and a Search Space #0 (which may correspond to its Search Space Index or the Search Space with ID 0). Assuming the selected SS / PBCH block and Demodulation Reference Signal (DMRS) quasi-co-addressable (QCLed) are transmitted in Control Resource Set #0, the UE can listen to Control Resource Set #0. The UE can receive system information through downlink control information transmitted in Control Resource Set #0. The UE can obtain the configuration information related to the Random Access Channel (RACH) required for initial access from the received system information. The UE can send a Physical RACH (PRACH) to the base station considering the selected SS / PBCH index, and the base station receiving the PRACH can obtain information about the SS / PBCH block index selected by the UE. The base station can know which SS / PBCH block the UE has selected and listen to the associated Control Resource Set #0.

[0108] Next, we will describe downlink control information (DCI) in 5G systems in detail.

[0109] In 5G systems, scheduling information for uplink data (or Physical Uplink Shared Channel (PUSCH)) or downlink data (or Physical Downlink Data Channel (PDSCH)) is transmitted from the base station to the UE via DCI. The UE can listen for both the backoff DCI format and the non-backoff DCI format for the PUSCH or PDSCH. The backoff DCI format can consist of predefined fixed fields between the base station and the UE, while the non-backoff DCI format can include configurable fields.

[0110] DCI can be transmitted via the PDCCH, which serves as the physical downlink control channel, through channel coding and modulation. Cyclic Redundancy Check (CRC) is added to the DCI message payload, and the CRC is scrambled with a Radio Network Temporary Identifier (RNTI) that identifies the UE. Different RNTIs can be used for DCI purposes, such as UE-specific data transmission, power control commands, or random access responses. In other words, the RNTI is not explicitly transmitted; rather, it is included in the CRC calculation process and transmitted accordingly. Upon receiving a DCI transmitted on the PDCCH, the UE uses the assigned RNTI to identify the CRC, and if the CRC is correct, the UE knows that the DCI has been sent.

[0111] For example, the DCI for scheduling PDSCH for System Information (SI) can be scrambled to SI-RNTI. The DCI for scheduling PDSCH for Random Access Response (RAR) messages can be scrambled to RA-RNTI. The DCI for scheduling PDSCH for paging messages can be scrambled to P-RNTI. The DCI providing Slot Format Indicator (SFI) can be scrambled to SFI-RNTI. The DCI providing Transmit Power Control (TPC) can be scrambled to TPC-RNTI. The DCI for scheduling UE-specific PDSCH or PUSCH can be scrambled using Cell RNTI (C-RNTI), Modulation and Coding Scheme C-RNTI (MCS-C-RNTI), or Configured Scheduling RNTI (CS-RNTI).

[0112] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, and in this case, CRC can be scrambled to C-RNTI. The DCI format 0_0 with CRC scrambled to C-RNTI can include information such as that shown in Table 4 below.

[0113] [Table 4]

[0114]

[0115]

[0116] DCI format 0_1 ​​can be used as a non-back-off DCI for scheduling PUSCH, and in this case, CRC can be scrambled to C-RNTI. DCI format 0_1 ​​with CRC scrambled to C-RNTI can include information such as that shown in Tables 5a and 5b below. Tables 5a to 5d show a series of fields (information) included in DCI format 0_1 ​​for easy separation.

[0117] [Table 5a]

[0118]

[0119]

[0120] [Table 5b]

[0121]

[0122]

[0123] [Table 5c]

[0124]

[0125]

[0126] [Table 5d]

[0127]

[0128] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, and in this case, CRC can be scrambled to C-RNTI. The DCI format 1_0 with CRC scrambled to C-RNTI can include information such as that shown in Table 6 below.

[0129] [Table 6]

[0130]

[0131]

[0132] DCI format 1_1 can be used as a non-back-off DCI for scheduling PDSCH, and in this case, CRC can be scrambled to C-RNTI. The DCI format 1_1 with CRC scrambled to C-RNTI can include information such as that shown in Tables 7a to 7c below. Tables 7a to 7c show a series of fields (information) included in DCI format 1_1 for easy separation.

[0133] [Table 7a]

[0134]

[0135]

[0136] [Table 7b]

[0137]

[0138]

[0139] [Table 7c]

[0140]

[0141] A method for allocating time-domain resources for data channels in a 5G communication system is described.

[0142] The base station can configure tables for time-domain resource allocation information for the Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH) to the UE via higher-layer signaling (e.g., RRC signaling). For PDSCH, a table with up to maxNrofDL-Allocations=16 entries can be configured, while for PUSCH, a table with up to maxNrofUL-Allocations=16 entries can be configured. The time-domain resource allocation information may include, for example, PDCCH-to-PDSCH time slot timing (which is designated as K0 and corresponds to the time interval between the PDCCH reception time and the PDSCH transmission time scheduled by the received PDCCH) or PDCCH-to-PUSCH time slot timing (which is designated as K2 and corresponds to the time interval between the PDCCH reception time and the PUSCH transmission time scheduled by the received PDCCH), information on the position and length of the start symbol for scheduling PDSCH or PUSCH in the time slot, and the mapping type of PDSCH or PUSCH.

[0143] For example, information such as that in Tables 8 and 9 below can be provided from the base station to the UE via higher-level signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0144] [Table 8]

[0145]

[0146] [Table 9]

[0147]

[0148] The base station can provide the UE with one of the entries in a table for time-domain resource allocation information via L1 signaling (e.g., DCI). (For example, it can be indicated by the "Time-domain Resource Allocation" field in the DCI). The UE can obtain the time-domain resource allocation information of PDSCH or PUSCH based on the DCI received from the base station.

[0149] A method for allocating frequency domain resources for data channels in a 5G communication system is described.

[0150] 5G supports two types (e.g., resource allocation type 0 and resource allocation type 1) as a method for indicating frequency domain resource allocation information for the Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH).

[0151] Resource allocation type 0

[0152] RB allocation information can be provided to the UE from the base station in the form of a bitmap of resource block groups (RBGs). In this case, an RBG can consist of a set of consecutive virtual RBs, and the size P of the RBG can be determined based on the value of the higher-layer parameter (rbg-Size) and the bandwidth portion size defined in Table 10 below.

[0153] [Table 10]

[0154]

[0155] For its size is The bandwidth portion i can be defined as the total number of RBGs as in Equation 1 below ( ).

[0156] ,in

[0157] The size of the first RGB is ,

[0158] if Then the final size of RBG is The remaining RBG sizes are all P.

[0159] Size is Each bit in the bitmap can correspond to a single RBG. The RBGs can be indexed in ascending order of frequency, starting from the lowest position of the bandwidth portion. For the bandwidth portion... RBG, can be RBG#0 to RBG#( -1) Mapping the MSB to LSB of the RBG bitmap. When a specific bit value in the bitmap is 1, the UE can determine that the RBG corresponding to that bit value has been assigned, while when a specific bit value in the bitmap is 0, the UE can determine that the RBG corresponding to that bit value has not been assigned.

[0160] Resource allocation type 1

[0161] RB allocation information can be provided from the base station to the UE as information for the start position and length of continuously assigned VRBs. In this case, interleaving or non-interleaving can be further applied to the continuously assigned VRBs. The resource allocation field of resource allocation type 1 can be configured with a resource indication value (RIV), and the RIV can be determined by the start position of the VRB (…). ) and the length of the continuously allocated RB ( It consists of ) . Specifically, The bandwidth portion of the RIV can be defined as follows.

[0162] if but

[0163]

[0164] otherwise

[0165]

[0166] in And should not exceed .

[0167] The base station can configure resource allocation types for the UE via higher-layer signaling (for example, higher-layer parameters can be configured). resourceAllocation Set as resourceAllocationType0 , resourceAllocationType1 or dynamicSwitch One of them). If the UE is configured with both resource allocation type 0 and resource allocation type 1 (or if higher-level parameters) resourceAllocation If the UE is configured with resource allocation type 0 or resource allocation type 1 in the same manner (and is set to dynamicSwitch in the same way), the bit corresponding to the MSB of the field indicating resource allocation in the DCI format indicating scheduling can be indicated via the remaining bits other than the bit corresponding to the most significant bit (MSB). Based on this, the UE can interpret the resource allocation field information of the DCI field. If the UE is configured with resource allocation type 0 or resource allocation type 1 (or if the higher-layer parameter resourceAllocation is set to dynamicSwitch in the same manner), the resource allocation information can be indicated via the remaining bits other than the bit corresponding to the most significant bit (MSB). resourceAllocationType0 or resourceAllocationType1 Then, resource allocation information can be indicated based on the resource allocation type. The resource allocation information is configured with a field indicating resource allocation in the DCI format indicating scheduling, and based on this, the UE can interpret the resource allocation field information of the DCI field.

[0168] The downlink control channel in a 5G communication system is described in more detail below with reference to the accompanying drawings.

[0169] Figure 8 The structure of the control resource set in a wireless communication system according to various embodiments of the present disclosure is shown.

[0170] Specifically, Figure 8 An example of transmitting the control resource set (CORESET) of the downlink control channel in a 5G wireless communication system is shown. Figure 8An example is shown where two control resource sets (control resource set #1 801 and control resource set #2 802) are configured in a time slot 820 on the time axis and where the UE bandwidth portion 810 is configured on the frequency axis. Control resource sets can be configured in specific frequency resources within the overall UE bandwidth portion 810 of the UE on the frequency axis. Figure 8 An example of a frequency resource 803 configured in control resource set #1 801 is shown. A control resource set can be configured with one or more OFDM symbols on a time axis, and can be defined as a control resource set duration 804.

[0171] Reference Figure 8 Control resource set #1 801 can be configured to a control resource set length of two symbols, and control resource set #2 802 can be configured to a control resource set length of one symbol.

[0172] The control resource set in 5G can be configured in the UE by the base station via higher-level signaling (e.g., system information, master information block (MIB), or radio resource control (RRC) signaling) or DCI. Configuring the control resource set for the UE means providing the UE with information such as the identifier (ID) of the control resource set, the frequency location of the control resource set, and the symbol length of the control resource set. The configuration information of the control resource set may include, for example, the information shown in Table 11 below.

[0173] [Table 11]

[0174]

[0175]

[0176] In Table 11, the tci-StatesPDCCH (Transmission Configuration Indication (TCI) state) configuration information may include information on one or more Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) blocks (i.e., Synchronization Signal Block (SSB)) indices or Channel State Information Reference Signal (CSI-RS) indices of DMRS Quasi-Co-located (QCLed) transmitted in the corresponding control resource set.

[0177] Figure 9 Resource structures in wireless communication systems according to various embodiments of the present disclosure are illustrated.

[0178] Specifically, Figure 9 An example basic unit of time and frequency resources that constitutes a downlink control channel that can be used in 5G is shown.

[0179] Reference Figure 9The basic unit of time and frequency resources constituting a downlink control channel (e.g., PDCCH) can be called a resource element group (REG) 903. A REG 903 can be defined with an OFDM symbol 901 on the time axis and a physical resource block (PRB) 902 on the frequency axis, consisting of 12 subcarriers. Base stations can configure downlink control channel allocation units by cascading REGs 903.

[0180] Reference Figure 9 If the basic unit for allocating downlink control channels in 5G is a Control Channel Element (CCE) 904, then one CCE 904 can be composed of multiple REG 903s. If... Figure 9 The REG 903 shown is described as an example; a REG 903 can consist of 12 REs. If a CCE 904 consists of, for example, 6 REG 903s, then a CCE 904 can consist of 72 REs. When a downlink control resource set is set, an area can consist of multiple CCE 904s, and a specific downlink control channel can be mapped to one or more CCE 904s and transmitted according to the aggregation level (AL) in the control resource set. CCE 904s in the control resource set are distinguished by numbers, and in this case, the number of CCE 904s can be assigned according to a logical mapping scheme.

[0181] Reference Figure 9 The basic unit of the downlink control channel (i.e., REG 903) can contain the RE to which the DCI is mapped and the region to which the DMRS 905 (a reference signal used to decode the RE) is mapped. (Refer to...) Figure 9 For example, three DMRS 905s can be transmitted within a single REG 903. The number of CCEs required to transmit the PDCCH can depend on the aggregation level (AL) and may be, for example, 1, 2, 4, 8, or 16, and different numbers of CCEs can be used to implement link adaptation of the downlink control channel. For example, if AL=L, a downlink control channel can be transmitted via L CCEs. The UE needs to detect the signal without knowing the downlink control channel information, and for blind decoding, a search space for the set of CCEs is defined. The search space is the set of candidate control channels consisting of CCEs that the UE needs to attempt to decode at a given aggregation level, and because there are several aggregation levels to bundle up to 1, 2, 4, 8, or 16 CCEs, the UE has multiple search spaces. The search space set can be defined as the set of search spaces under all configured aggregation levels.

[0182] The search space can be categorized into a common search space and a UE-specific search space. A predetermined group of UEs or all UEs can search the common search space of the PDCCH to receive dynamic scheduling of cell common control information (e.g., paging messages) or system information. For example, the PDSCH scheduling allocation information for transmitting SIBs containing, for example, cell service provider information can be received by probing the common search space of the PDCCH. In the case of the common search space, since a group of UEs or all UEs need to receive the PDCCH, it can be defined as a set of previously agreed CCEs. UE-specific PDSCH or PUSCH scheduling allocation information can be received by checking the UE-specific search space of the PDCCH. The UE-specific search space can be specifically defined for the UE based on various system parameters and identification information (identifiers).

[0183] In 5G, the base station can configure parameters for the search space used for PDCCH in the UE via higher-level signaling (e.g., SIB, MIB, or RRC signaling). For example, the base station can configure the UE with parameters such as the number of PDCCH candidates under each aggregation level L, the listening period for the search space, the listening timing of symbol cells in the time slots of the search space, the search space type (public search space or UE-specific search space), the combination of RNTI and DCI formats to be listened to in the search space, and the control resource set index to be listened to in the search space. For example, the configuration information for the search space used for PDCCH may include information as shown in Table 12.

[0184] [Table 12]

[0185]

[0186]

[0187] Based on the configuration information, the base station can configure one or more search space sets to the UE. According to an embodiment, the base station can configure search space set 1 and search space set 2 to the UE and configure them to listen for DCI format A scrambled to X-RNTI in search space set 1 in a common search space, and to listen for DCI format B scrambled to Y-RNTI in search space set 2 in a UE-specific search space. In X-RNTI and Y-RNTI, "X" and "Y" can correspond to one of the various RNTIs described below.

[0188] Based on the above configuration information, one or more search space sets can exist in a public search space or a UE-specific search space. For example, search space set #1 and search space set #2 can be configured in the public search space, and search space set #3 and search space set #4 can be configured in the UE-specific search space.

[0189] In the public search space, combinations of DCI formats and RNTI can be monitored. Of course, the various embodiments of this disclosure are not limited to the following examples.

[0190] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, MCS-C-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, or SI-RNTI.

[0191] DCI format 2_0 with CRC scrambled by SFI-RNTI

[0192] DCI format 2_1 with CRC scrambled by INT-RNTI

[0193] DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI or TPC-PUCCH-RNTI

[0194] DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0195] Within a specific UE search space, combinations of DCI formats and RNTI can be monitored. Of course, the various embodiments of this disclosure are not limited to the examples below.

[0196] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, or TC-RNTI

[0197] DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI or TC-RNTI

[0198] The specified RNTI can be defined and used as follows.

[0199] C-RNTI (Cell RNTI): Used for scheduling UE-specific PDSCH

[0200] Modulation coding scheme C-RNTI (MCS-C-RNTI): used for scheduling UE-specific PDSCH

[0201] Temporary Cell RNTI (TC-RNTI): Used for scheduling UE-specific PDSCH

[0202] Configured Scheduling RNTI (CS-RNTI): Used to schedule UE-specific PDSCHs that are configured semi-statically.

[0203] Random Access RNTI (RA-RNTI): Used for scheduling PDSCH during the random access phase.

[0204] Paging RNTI (P-RNTI): Used to schedule the PDSCH for sending paging requests.

[0205] System Information RNTI (SI-RNTI): Used to schedule the transmission of system information via PDSCH.

[0206] Interrupt RNTI (INT-RNTI): Used to indicate whether a hole has been punched in the PDSCH.

[0207] Transmit Power Control RNTI for PUSCH (TPC-PUSCH-RNTI): Used to indicate power control commands for PUSCH.

[0208] Transmit Power Control RNTI for PUCCH (TPC-PUCCH-RNTI): Used to indicate power control commands for PUCCH.

[0209] Transmit Power Control RNTI for SRS (TPC-SRS-RNTI): Used to indicate power control commands for SRS.

[0210] The DCI format described above can follow the definitions in Table 13 below.

[0211] [Table 13]

[0212]

[0213] In 5G, the search space of the aggregation level L in the control resource set p and the search space set s can be expressed by the following equation 1.

[0214] [Formula 1]

[0215]

[0216] -L: Aggregation level

[0217] -n CI Carrier index

[0218] -N CCE,p The total number of CCEs existing in the control resource set p.

[0219] -N μ s,f Time slot index

[0220] -M (L) p,s,max Number of PDCCH candidates for aggregation level L

[0221] -M snCI =0, ..., M (L) p,s,max -1: PDCCH candidate index with aggregation level L

[0222] -i=0, ..., L-1

[0223] - , , , , ,

[0224] -n RNTI UE identifier

[0225] Y_(p,n μ s,f In the case of a public search space, it can be 0.

[0226] In the context of a specific search space for the UE, Y_(p,n) μ s,f The value can vary depending on the UE's identifier (C-RNTI or ID configured in the UE by the base station) and time index.

[0227] Figure 10 The process of discontinuous reception (DRX) in a wireless communication system according to various embodiments of the present disclosure is illustrated.

[0228] Specifically, Figure 10 This is a view illustrating Discontinuous Reception (DRX) operation. Specifically, Discontinuous Reception (DRX) is the operation where a UE using the service receives data discontinuously in an RRC connected state, where a radio link is established between the base station and the UE. DRX is also known as DRX in RRC connected state (i.e., C-DRX). When DRX is applied, the UE turns on the receiver to listen to the control channel at specific times, and turns off the receiver if no data is received within a certain period of time to reduce the UE's power consumption. DRX operation can be controlled by the MAC layer device based on various parameters and timers.

[0229] Reference Figure 10 The activity time of 1005 is the time during which the UE wakes up and listens to the PDCCH every DRX cycle. The activity time of 1005 can be defined as follows.

[0230] drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, or ra-ContentionResolutionTimer are running; or

[0231] A scheduling request is sent on the PUCCH and the scheduling request is pending; or

[0232] This indicates that a new transmission addressed to the MAC entity via C-RNTI has not been received after a successful random access response for a random access preamble not selected by the MAC entity in a contention-based random access preamble.

[0233] DRX-related timers such as drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, and ra-ContentionResolutionTimer are timers whose values ​​are set by the base station and have the function of configuring the UE to listen to the PDCCH when predetermined conditions are met.

[0234] `drx-onDurationTimer` 1015 is a parameter used to set the minimum time the UE remains awake during the DRX cycle. `drx-InactivityTimer` 1020 is a parameter used to set the additional time the UE remains awake upon receiving a PDCCH (1030) indicating a new uplink or downlink transmission. `drx-RetransmissionTimerDL` is a parameter used to set the maximum time the UE remains awake to receive downlink retransmissions during downlink HARQ processing. `drx-RetransmissionTimerUL` is a parameter used to set the maximum time the UE remains awake to receive uplink retransmission permissions during uplink HARQ processing. The above `drx-onDurationTimer`, `drx-InactivityTimer`, `drx-RetransmissionTimerDL`, and `drx-RetransmissionTimerUL` can be set to, for example, time, number of subframes, number of time slots, etc. `ra-ContentionResolutionTimer` is a parameter used to listen to the PDCCH during random access.

[0235] The inActive time 1010 is a time set to prevent the UE from listening to the PDCCH during DRX operation, or a time set to prevent the UE from receiving the PDCCH, and can be the remainder of the entire DRX execution time except for the active time 1005. If the UE does not listen to the PDCCH during the active time 1005, the UE can enter a sleep or inactive state to reduce power consumption.

[0236] The DRX cycle refers to the period during which the UE wakes up and listens to the PDCCH. In other words, the DRX cycle refers to the time interval from when the UE starts listening to the PDCCH to when the UE starts listening to the next PDCCH, or the period during which the call duration occurs. There are two types of DRX cycles: short DRX cycles and long DRX cycles. Short DRX cycles can be optionally applied.

[0237] The long DRX period 1025 is the longer of the two DRX periods configured in the UE. The UE restarts drx-onDurationTimer 1015, initiating the long DRX period 1025 after the start point (e.g., the start symbol) of drx-onDurationTimer 1015, and operates within the long DRX period. When operating within the long DRX period 1025, the UE can initiate drx-onDurationTimer 1015 in a slot following drx-SlotOffset in a subframe satisfying Equation 2 below. Here, drx-SlotOffset refers to the delay before initiating drx-onDurationTimer 1015. drx-SlotOffset can be set to, for example, time or the number of slots.

[0238] [Equation 2]

[0239] [(SFN × 10) + subframe number] modulo (drx-LongCycle) = drx-StartOffset

[0240] Here, drx-LongCycleStartOffset can include a long DRX period of 1025 and drx-StartOffset, and can be used to define the subframe starting from the long DRX period of 1025. drx-LongCycleStartOffset can be set to, for example, time, number of subframes, number of time slots, etc.

[0241] The short DRX period is the shorter of the two DRX periods defined in the UE. The UE operates during the long DRX period 1025, and if a predetermined event occurs during the active time 1005, such as receiving a PDCCH indicating a new uplink or downlink transmission at 1030, the UE initiates or restarts the drx-InactivityTimer 1020. The UE can operate during the short DRX period if the drx-InactivityTimer 1020 expires or a DRX command MAC CE is received. For example, in... Figure 10In this scenario, the UE can initiate a drx-ShortCycleTimer when the previous drx-onDurationTimer 1015 or drx-InactivityTimer 1020 expires, and can operate in the short DRX cycle until the drx-ShortCycleTimer expires. When the UE receives a PDCCH (1030) indicating a new uplink or downlink transmission, the UE can anticipate future additional uplink or downlink transmissions and extend the active time 1005 or delay the arrival of the inactive time 1010. When operating in the short DRX cycle, the UE restarts drx-onDurationTimer 1015, initiating the short DRX cycle after the start point of the previous on-duration duration. Subsequently, when the drx-ShortCycleTimer expires, the UE returns to operating in the long DRX cycle 1025.

[0242] When operating in a short DRX cycle, the UE can initiate drx-onDurationTimer 1015 after drx-SlotOffset in a subframe that satisfies Equation 3 below. Here, drx-SlotOffset refers to the delay before initiating drx-onDurationTimer 1015. drx-SlotOffset can be set to, for example, time or the number of time slots.

[0243] [Formula 3]

[0244] [(SFN × 10) + subframe number] modulo (drx-LongCycle) = (drx-StartOffset)modulo (drx-ShortCycle)

[0245] Here, drx-ShortCycle and drx-StartOffset can be used to define the subframe that begins a short DRX cycle. drx-ShortCycle and drx-StartOffset can be set to, for example, time, the number of subframes, or the number of time slots.

[0246] The above has already been referenced. Figure 10 DRX operation is described. According to an embodiment, the UE can reduce its power consumption by performing DRX. However, even when the UE performs DRX, the UE does not always receive the PDCCH associated with the UE during activity time 1005. Therefore, according to an embodiment, signals for controlling the operation of the UE can be provided to save the UE's power more efficiently.

[0247] The carrier aggregation and scheduling methods in 5G communication systems are described in detail below.

[0248] The UE can access the primary cell through initial access, and the base station can additionally configure one or more secondary cells for the UE. The UE can perform communication through the serving cell, which includes the secondary cells configured by the base station and the primary cell.

[0249] The base station can be additionally configured to perform cross-carrier scheduling for cells configured in the UE. For ease of description, when cross-carrier scheduling is configured, the cell performing the scheduling (i.e., the cell receiving downlink control information corresponding to downlink assignments or uplink grants) is collectively referred to as the "first cell," while the cell performing the scheduling (i.e., the cell that actually schedules and transmits / receives downlink or uplink data based on downlink control information) is referred to as the "second cell." If the base station configures cross-carrier scheduling for the UE for a specific cell A (the scheduled cell), in which case cell A corresponds to the "second cell," the UE does not perform PDCCH listening in cell A, but can perform PDCCH listening in another cell B (i.e., the scheduling cell), indicated by cross-carrier scheduling (in which case cell B corresponds to the "first cell"). To configure cross-carrier scheduling for the UE, the base station can configure the UE with information about the "first cell" performing scheduling for the "second cell" (e.g., the cell index of the "first cell") and the carrier indicator field (CIF) value of the "second cell." For example, the configuration information described in Table 14 below can be provided from the base station to the UE via higher-level signaling (e.g., RRC signaling).

[0250] [Table 14]

[0251]

[0252] The UE can listen to the PDCCH of the cell configured through cross-carrier scheduling in the "first cell". The UE can determine the index of the cell scheduled by the received DCI based on the value of the carrier indicator field in the DCI format of the scheduling data, and based on this, can send / receive data in the cell indicated by the carrier indicator.

[0253] The scheduled cell (cell A) and the scheduling cell (cell B) can be configured with different parameter sets. Parameter sets may include subcarrier spacing, cyclic prefix, etc. When cell A and cell B have different parameter sets, when cell B's PDCCH schedules cell A's PDSCH, the following minimum scheduling offset between PDCCH and PDSCH can be considered separately.

[0254] [Cross-carrier scheduling method]

[0255] If the subcarrier spacing of cell B is (μ) B The subcarrier spacing of cell A is less than (μ). AThen, the PDSCH can be scheduled from the next PDSCH slot, which is X symbols following the last symbol of the PDCCH received from cell B. Here, X can depend on μ. B And different, and can be in μ B At 15kHz, it is defined as X=4 symbols, in μ B =30kHz is defined as X=4 symbols, while μ B =60kHz is defined as X=8 symbols.

[0256] If the subcarrier spacing of cell B is (μ) B The subcarrier spacing of cell A is greater than (μ). A If this is true, then PDSCH can be scheduled starting from a certain time (i.e., X symbols after the last symbol of the PDCCH received from cell B). Here, X can depend on μ. B And different, and can be in μ B =30kHz is defined as X=4 symbols, in μ B =60kHz is defined as X=8 symbols, while μ B =120kHz is defined as X=12 symbols.

[0257] The following describes in detail a method for configuring the Transport Configuration Indicator (TCI) state, which is a means of indicating or exchanging Quasi-Co-location (QCL) information between the UE and the base station in a 5G communication system.

[0258] A base station can configure and indicate the TCI state between two different RSs or channels via appropriate signaling, thereby announcing the QCL relationship between different RSs or channels. Furthermore, the base station can configure and indicate the TCI state of the PDCCH (or PDCCH DMRS) via appropriate signaling. The TCI state is intended to announce the quasi-co-addressable (QCL) relationship between different RSs or channels and the PDCCH (or PDCCH DMRS). When different RSs or channels are quasi-co-addressable, this means that when estimating the channel via a reference antenna port A (reference RS #A) and an RS antenna port B (target RS #B) with a QCL relationship, the UE is allowed to apply all or some of the large-scale channel parameters estimated from antenna port A to the channel measurement results from antenna port B. The QCL may require different parameters to be associated depending on contexts such as: 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource measurement (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Therefore, NR supports the four types of QCL relationships shown in Table 15 below.

[0259] [Table 15]

[0260]

[0261] Spatial RX parameters can collectively refer to all or some of the following parameters: angle of arrival (AoA), power angular spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0262] QCL relationships can be configured to the UE using the RRC parameters TCI-State and QCL information (QCL-Info) as shown in Table 16 below. Referring to Table 16, the base station can configure one or more TCI states for the UE, thereby indicating up to two QCL relationships (qcl-Type1, qcl-Type2) for the RS (i.e., the target RS) that references the TCI state ID. In this case, the QCL information (QCL-Info) included in each TCI state includes the 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 15.

[0263] [Table 16]

[0264]

[0265] The paging method in a 5G communication system is described in detail below.

[0266] Figure 11 The paging process in a wireless communication system according to various embodiments of the present disclosure is illustrated.

[0267] Specifically, Figure 11 This is a view illustrating the paging process of a 5G communication system. The paging process can be used to indicate the existence of an incoming call to a UE in an idle or inactive state, and to indicate that network access for the UE has commenced or to inform a connected UE that system information has changed. Paging can be controlled by the Mobility Management Entity (AMF) and can be sent across multiple cells in the Tracking Area (TA). (See reference...) Figure 11The paging is transmitted from AMF 1103 to UE 1101 via base station gNB 1102. More specifically, the paging begins at AMF 1103 and is transmitted 1104 to gNB 1102 via S1AP signaling 1104, and then to UE 1101 via RRC signaling 1106. In this case, UE 1101 can know whether a paging message exists by listening to PDCCH 1105 configured with P-RNTI on paging timings 1107a, 1170b, and 1170c. Paging timings 1170a, 1170b, and 1170c can be determined based on the DRX periods 1108a and 1108b configured for the UE by the base station. Upon receiving PDCCH 1105 configured with P-RNTI, the UE can receive the paging message 1106 on the PDSCH scheduled via PDCCH 1105. Paging message 1106 may include UE identifier (UE ID) information about the UE that will be woken up by the base station.

[0268] An efficient paging process should be such that, for the majority of the time, UE 1101 can rest without receiving data, but only wakes up during predetermined time intervals to observe paging information from the network. For this purpose, paging timing (PO) and paging frames (PF) are defined in NR. A PO can be defined as a subframe or time point when a PDCCH configured with P-RNTI for receiving paging messages is present. A PF can be defined as a radio frame that includes one or more POs. Figure 11 In one embodiment, UE 1101 can observe a PO every discontinuous reception (DRX) cycles 1108a and 1108b.

[0269] Figure 12 This is a view illustrating paging operations in a wireless communication system according to various embodiments of the present disclosure.

[0270] Specifically, refer to Figure 12When UE 1201 is in the RRC_IDLE state, the NR network knows the location of UE 1201 on a tracking area (TA) basis, not on a cell basis. When accessing the NR network (i.e., the 5G network), the Access and Mobility Management Function (AMF) 1205 assigns a Tracking Area Identifier (TAI) list to the UE. UE 1201 can move freely within cells in the TAI list without updates from AMF 1205. When an incoming call to UE 1201 occurs, AMF 1205 sends the same paging message to all cells 1202, 1203, and 1204 in TA 1206 currently configured for UE 1201, and each cell 1202, 1203, and 1204 sends a paging message to the corresponding UE 1201. When a cell is (re)selected, UE 1201 can obtain the Tracking Area Code (TAC) of the corresponding cell through system information (e.g., SIB1) and thereby identify whether the corresponding cell is in its TAI list. If the TAC of the selected cell is not in the TAI list, the UE sends a TAU message to AMF 1205. When sending a response to the TAU message (TAU Accept), AMF 1205 can also transmit the TAI list, thereby updating the UE with the TAI list according to the UE's relocation.

[0271] The PDCCH listening operation for UE to receive paging is described in detail below.

[0272] The UE can listen for a paging opportunity (PO) every DRX cycle. A PO can consist of a set of multiple PDCCH listening opportunities, and the time slot in which the DCI for paging can be transmitted can consist of multiple time slots / resources (e.g., subframes or OFDM symbols). A paging frame (PF) can correspond to a radio frame and can include one or more POs or the start point of any PO.

[0273] During multi-beam operation, the UE may assume that the same paging message or the same short message is repeated on all transmit beams. In this case, which beam is selected to receive the paging message or short message can be determined by the UE implementation. For paging initiated by the Radio Access Network (RAN) and paging initiated by the Core Network (CN), all paging messages can be identical.

[0274] If a paging message is received from the RAN, the UE can initiate the RRC connection recovery procedure. If a paging message is received from the CN while in RRC_INACTIVE state, the UE can switch to RRC_IDLE mode and notify the Network Attached Storage (NAS).

[0275] Paging frames (PF) and paging timing (PO) can be determined using the following formula.

[0276] The system frame number (SFN) corresponding to the paging frame can be determined using Equation 4 below. In Equation 4, A mod B can refer to the modulo operation of the output obtained by dividing A by B.

[0277] [Formula 4]

[0278]

[0279] [Formula 5]

[0280]

[0281] The parameters used to determine the paging frame and paging timing can be defined as follows in Equations 4 and 5.

[0282] T: The DRX cycle configured in the UE can be configured using higher-level signaling (e.g., RRC signaling or System Information Block (SIB)).

[0283] N: Total number of paging frames in T

[0284] Ns: The number of paging opportunities in a paging frame

[0285] PF_offset: The offset value used to determine the time of the paging frame.

[0286] UE_ID: The UE ID used to determine the paging frame and paging timing, which can be determined as shown in Equation 6 below.

[0287] [Formula 6]

[0288]

[0289] The 5G S-Temporary Mobile Subscriber Identifier (5G-S-TMSI) is a temporary UE identifier provided by the core network to uniquely identify a UE within a Tracking Area (TA). The 5G-S-TMSI can be received by the UE via, for example, higher-layer signaling. If the UE is not yet registered with the network, the UE can assume its UE_ID is 0. Alternatively, the UE ID used for paging can correspond to a parameter determined by the International Mobile Subscriber Identity (IMSI). In this disclosure, the UE ID used for paging is extended to mean the UE_ID. Here, the UE_ID can include both values ​​that can be set based on the 5G-S-TMSI and values ​​that can be derived from the IMSI value.

[0290] The PDCCH (or PDCCH scrambled with P-RNTI) listening timing for paging can be determined by the following: the search space configuration for paging (e.g., the search space indicated by the higher-level signaling parameter pagingSearchSpace) and the configuration of the first PDCCH listening timing for paging timing (e.g., the higher-level signaling parameter firstPDCCH-MonitoringOccasionOfPO) information, as well as the number of PDCCH listening timings per SS / PBCH block (SSB) in the paging timing (e.g., the higher-level signaling parameter nrofPDCCH-MonitoringOccasionPerSSB-InPO). pagingSearchSpace, firstPDCCH-MonitoringOccasionOfPO, and nrofPDCCH-MonitoringOccasionPerSSB-InPO can be specifically defined as shown in Table 17 below.

[0291] [Table 17]

[0292]

[0293] When the paging search space is set to the search space with search space ID 0, if the number of paging opportunities (Ns) for a paging frame is 1, then there can be one paging opportunity in the paging frame. If Ns=2, then there can be two paging opportunities in the paging frame: the first paging opportunity (i_s=0) can exist in the first half-frame of the paging frame, and the second paging opportunity (i_s=1) can exist in the second half-frame of the paging frame. Here, the search space with search space ID 0 can correspond to the search space set according to the Master Information Block (MIB).

[0294] If the paging search space is set to a search space with a search space ID that is not 0, then the UE can listen for the (i_s+1)th paging opportunity. A paging opportunity can be determined by 'S'. X' consecutive PDCCH listening opportunities constitute the event. Here, "S" can correspond to the number of SS / PBCH blocks (SSBs) actually transmitted, and the corresponding information can be transmitted from the base station to the UE as a specific parameter of the System Information Block (SIB) (e.g., ssb-PositionsInBurst value). 'X' can correspond to the number of PDCCH listening opportunities per SS / PBCH block in the paging opportunities set by the base station for the UE (e.g., higher-layer signaling parameter nrofPDCCH-MontiroingOccasionPerSSB-InPO), and if no corresponding configuration information is available, the UE can assume X=1. The [x'th]th PDCCH listening opportunity in the paging opportunities The S+K] PDCCH monitoring time (where x = 0, 1, 2, ..., X-1 and can be defined as K = 1, 2, 3, ..., S) can correspond to the Kth transmitted SS / PBCH block. Starting from the first PDCCH monitoring time in the paging frame, PDCCH monitoring times that do not overlap with uplink (UL) symbols can be numbered sequentially from 0. In this case, if firstPDCCH-MonitoringOccasionOfPO is set via higher-layer signaling, the starting PDCCH monitoring time number of the (i_s+1)th paging time can correspond to the (i_s+1)th value in the firstPDCCH-MonitoringOccasionOfPO parameter. If firstPDCCH-MonitoringOccasionOfPO is not set via higher-layer signaling, the starting PDCCH monitoring time number of the (i_s+1)th paging time can be the same as i_s... S X is the same. If X>1, then when the UE detects the PDCCH corresponding to the P-RNTI at a certain paging time, the UE does not need to perform listening for the rest of the corresponding paging time or perform subsequent PDCCH listening.

[0295] A paging timing associated with a paging frame can begin within or after the corresponding paging frame.

[0296] A PDCCH listening opportunity for any paging event can exist over multiple radio frames. When the search space used for paging is set to a search space with a search space ID other than 0, a PDCCH listening opportunity for a paging event can exist over multiple cycles of the paging search space.

[0297] Refer to the TS 38.304 standard, as shown in Tables 18a and 18b below, for the definition of discontinuous reception for paging.

[0298] [Table 18a]

[0299]

[0300]

[0301] [Table 18b]

[0302]

[0303] The base station can send a PDCCH for paging to the UE. The corresponding PDCCH may include scheduling information of the PDSCH containing the paging message. The paging message may include ID information about one or more UEs that will be woken up by the base station. More specifically, the information illustrated in Table 19 below can be included in the paging information.

[0304] [Table 19]

[0305]

[0306] After receiving the PDCCH for paging from the base station, the UE can receive the PDSCH scheduled by the corresponding PDCCH. A UE with the same UE_ID as indicated by the paging message sent on the received PDSCH can be woken up to perform subsequent operational procedures (e.g., random access or RRC connection).

[0307] The following describes in detail the contents of the DCI format scrambled with P-RNTI in a 5G communication system. The DCI format scrambled with P-RNTI can consist of, for example, the following fields.

[0308] Short Message Indicator (SCI) - 2 bits

[0309] Short message—8 bits according to Clause 6.5 of [9, TS38.331]. This field is reserved if scheduling information used only for paging is transmitted.

[0310] Frequency domain resource allocation information— This field is reserved if only short messages are transmitted. The number of RBs is defined as the downlink bandwidth portion.

[0311] Time-domain resource allocation information—4 bits. This field is reserved if only short messages are transmitted.

[0312] VRB-to-PRB mapping—1 bit according to Table 7.3.1.2.2-5. This field is reserved if only short messages are transmitted.

[0313] Modulation and coding scheme—5 bits, this field is reserved if only short messages are transmitted.

[0314] TB scaling—2 bits as defined in Clause 5.1.3.2 of [6, TS38.214]. This field is reserved if only short messages are transmitted.

[0315] Reserved bits—8 bits for operations in cells with shared spectrum channel access, otherwise 6 bits.

[0316] [Table 20]

[0317]

[0318] Table 20 shows the short message indicator in the DCI format scrambled with P-RNTI.

[0319] Referring to Table 20, when the bit field is 00, the short message indicator is reserved; when the bit field is 01, it indicates that only the scheduling information used for paging exists in the DCI; when the bit field is 10, it indicates that only the short message exists in the DCI; and when the bit field is 11, it indicates that both the scheduling information used for paging and the short message exist in the DCI.

[0320] The method for configuring TCI status for PDCCH (or PDCCH DMRS) in a 5G communication system is the same as described above with reference to Tables 15 and 16.

[0321] Figure 13 Base station beam allocation based on TCI state is illustrated in a wireless communication system according to various embodiments of the present disclosure.

[0322] Specifically, Figure 13 An example of base station beam allocation configured according to TCI status is shown. (Refer to...) Figure 13 The base station can transmit information about N different beams to the UE through N different TCI states. For example, when... Figure 13 When N = 3, the base station can inform the UE that the qcl-Type2 parameters (refer to Table 16 above) included in the three TCI states 1300, 1305, and 1310 are associated with the CSI-RS or SSB corresponding to different beams and are set in QCL type D, so that the antenna ports referencing different TCI states 1300, 1305, and 1310 are associated with different spatial RX parameters, i.e., different beams. Specifically, the combinations of TCI states applicable to the PDCCHDMRS antenna ports are shown in Table 21 below. In Table 21, the fourth row is the combination assumed by the UE before RRC configuration and is not possible after RRC configuration.

[0323] [Table 21]

[0324]

[0325] Figure 14 The process of layered signaling in a wireless communication system according to various embodiments of the present disclosure is illustrated.

[0326] The embodiments of this disclosure support, for example Figure 14 The layered signaling method for dynamic allocation of PDCCH beams is shown. (Refer to...) Figure 14The base station can configure N TCI states 1405, 1410, 1415, ..., 1420 for the UE via RRC signaling 1400, and set some of them as the CORESET TCI state (1425). Subsequently, the base station can indicate one of the CORESET TCI states 1430, 1435, ..., 1440 (1445) to the UE via MAC CE signaling. Afterwards, the UE can receive DCI on the PDCCH based on the beam information included in the TCI state indicated by the MAC CE signaling.

[0327] Figure 15 Examples of signaling structures in wireless communication systems according to various embodiments of the present disclosure are shown.

[0328] Specifically, Figure 15 This is a view showing the TCI indication MAC CE signaling structure used for PDCCH DMRS. (Refer to...) Figure 15 The TCI indication MAC CE signaling used for PDCCH DMRS consists of 2 bytes (16 bits) and includes 1 reserved bit 1510, 5 bits serving cell ID 1515, 2 bits BWP ID 1520, 2 bits CORESETID 1525 and 6 bits TCI status ID 1530.

[0329] The base station can set one or more TCI states for a specific control resource set (CORESET) to the UE and activate one of the set TCI states via a TCI Indication MAC CE activation command. For example, {TCI state #0, TCI state #1, TCI state #2} is set as TCI states in control resource set #1. The base station can send an activation command to the UE via the TCI Indication MAC CE to activate TCI state #0 as the TCI state of control resource set #1. Based on the TCI state activation command received via the TCI Indication MAC CE, the UE can correctly receive the DMRS of the corresponding control resource set based on the QCL information in the activated TCI state.

[0330] If the UE is not provided with a TCI state configuration indicating the QCL information of the DMRS antenna port for receiving the PDCCH configured via the MIB (or the control resource set ID (or index) of 0 or control resource set #0), the UE may assume that the physical layer channel has been QCLed based on the average gain, QCL-Type A, and QCL-Type D characteristics.

[0331] The DMRS (or DMRS antenna port) associated with the PDCCH received with the control resource set set via MIB (or control resource set ID 0 or control resource set #0).

[0332] DMRS antenna port associated with the reception of its corresponding PDSCH (or PDSCH scheduled via PDCCH sent with control resource set #0).

[0333] The corresponding SS / PBCH block (or the SS / PBCH block associated with control resource set #0 or the SS / PBCH block used to send the MIB corresponding to control resource set #0 of the configuration)

[0334] The relevant parts of the TS38.213 standard that have already been described above are shown in Table 22 below.

[0335] [Table 22]

[0336]

[0337] If a search space with search space ID 0 has been configured for the common search space set used for UE to listen to SI-RNTI / P-RNTI (or when the common search space set used for listening to SI-RNTI / P-RNTI is a search space set configured with MIB or in the case of search space #0), the UE can listen to PDCCH in the listening time associated with SS / PBCH block A, and in this case, SS / PBCH block A can be determined as follows.

[0338] The UE can receive a command via the TCI Instruction MAC CE to activate a specific TCI state for control area #0, and in this case, the TCI state may include the CSI-RS associated with any SS / PBCH. The SS / PBCH associated with the CSI-RS in the TCI state activated by the TCI Instruction MAC CE most recently received by the UE may correspond to SS / PBCH block A.

[0339] When performing random access, the UE can send a preamble synchronization code (or physical random access channel (PRACH)) associated with a specific SS / PBCH to the base station. The SS / PBCH identified by the most recently performed random access procedure by the UE can correspond to SS / PBCH block A.

[0340] The relevant parts of the TS 38.213 standard that have already been described above are shown in Table 23 below.

[0341] [Table 23]

[0342]

[0343] For control resource sets whose index is set to a value other than 0 (control resource set #X).

[0344] If the TCI state of control resource set #X is not configured to the UE, or if one or more TCI states are configured but no TCI indication MAC CE activation command for activating one of them is received, the UE may assume that the DMRS sent in control resource set #X is QCLed with the SS / PBCH block identified during the initial access procedure.

[0345] If the UE has been configured with one or more TCI states as part of a handover procedure (or a reconfiguration procedure with synchronization), but has failed to receive a TCI indication MAC CE activation command to activate one of them, the UE may assume that the DMRS sent in control resource set #X has been QCLed with the SS / PBCH or CSI-RS resource identified during the random access procedure initiated during the handover procedure (or the reconfiguration procedure with synchronization).

[0346] The relevant parts of the TS 38.213 standard that have already been described above are shown in Table 24 below.

[0347] [Table 24]

[0348]

[0349] For the control resource set whose index is 0 (control resource set #0), the UE may assume that the DMRS antenna port of the PDCCH received in control resource set #0 is associated with the following physical resource QCLed.

[0350] Includes the downlink reference signal in the TCI state activated by the TCI-indicated MAC CE activation command; or

[0351] If the terminal does not receive a TCI Indication MAC CE Activation command for the TCI state, then the SS / PBCH block identified by the terminal through the most recent random access procedure (however, random access, not contention-free random access triggered in the PDCCH command) will be used.

[0352] The relevant parts of the TS38.213 standard that have already been described above are shown in Table 25 below.

[0353] [Table 25]

[0354]

[0355] Master Information Block (MIB)

[0356] SIB (System Information Block) or SIB X (X=1, 2, ...)

[0357] Radio Resource Control (RRC)

[0358] Media Access Control (MAC) Control Element (CE)

[0359] UE Capability Report

[0360] UE Assistance Message

[0361] In addition, L1 signaling can be signaling corresponding to at least one or more of the following physical layer channels or signaling methods, or a combination thereof.

[0362] Physical Downlink Control Channel (PDCCH)

[0363] Downlink Control Information (DCI)

[0364] UE-specific DCI

[0365] Group Public DCI

[0366] Public DCI

[0367] Scheduling DCI (e.g., DCI used to schedule downlink or uplink data)

[0368] Non-schedulable DCI (e.g., DCI not used for scheduling downlink or uplink data)

[0369] Physical Uplink Control Channel (PUCCH)

[0370] Uplink Control Information (UCI)

[0371] In the following description, each mathematical operator is defined as follows.

[0372] floor(X): A function that outputs the largest integer less than X.

[0373] ceil(X): A function that outputs the smallest integer greater than X.

[0374] A mod B: A function that outputs the remainder when A is divided by B (modulo operator).

[0375] max(X,Y): A function that outputs the larger of X and Y.

[0376] min(X,Y): A function that outputs the smaller of X and Y.

[0377] The following terms, such as Paging PDCCH, PDCCH for paging, PDCCH corresponding to paging, PDCCH scrambled with P-RNTI, and PDCCH configured with P-RNTI, may all have the same meaning.

[0378] The following terms, such as PDSCH for paging, PDSCH for paging, PDSCH for sending paging information, PDSCH scrambled with P-RNTI, and PDSCH configured with P-RNTI, may all have the same meaning.

[0379] As described above, in a wireless communication system, a base station can send a paging message to wake up a UE. The base station can send a PDCCH and PDSCH for paging to the UE. The UE can receive configuration information from the base station for listening to the PDCCH for paging and determine the paging frame and paging timing based on the corresponding configuration information. The UE can listen to the PDCCH for paging during one or more PDCCH listening times. In this case, the assumed receive beam at the receiver when the UE listens to the PDCCH can vary depending on the configuration information for listening to the PDCCH for paging (specifically, configuration information regarding the search space and control resource set). In other words, the UE can control the assumption of the QCL relationship for receiving the PDCCH differently based on the paging PDCCH configuration information.

[0380] This disclosure provides various embodiments that assume the QCL relationship of the UE based on paging PDCCH configuration information.

[0381] In embodiments of this disclosure, a control resource set with control resource set ID (or index) X is defined as control resource set #X.

[0382] In a first embodiment of this disclosure, a method is proposed to assume QCL when the UE is listening to the paging PDCCH, provided that the UE is configured with a control resource set #0 (which may be referred to as a first control resource set or a common control resource set) as the control resource set for listening to paging PDCCH from the base station and is configured with a search space #0 (which may be referred to as a first search space or a common search space) as the search space.

[0383] When the UE is configured with control resource set #0 as the control resource set for paging PDCCH and with search space #0 as the search space, the UE may assume that the DMRS antenna port of the PDCCH received through control resource set #0 and the DMRS antenna port of the PDSCH scheduled by the corresponding PDCCH are both QCLed with respect to at least one of QCL-Type A or QCL-Type D in the SS / PBCH block (SSB) associated with control resource set #0.

[0384] In a specific example, the UE can receive SS / PBCH block A and receive configuration information about control resource set #0 and search space #0 from the MIB transmitted on the received PBCH. The UE can then listen for the PDCCH used for paging based on the received configuration information about control resource set #0 and search space #0. In this case, the UE can assume that the DMRS antenna port of the PDCCH and the DMRS antenna port of the PDSCH scheduled by the PDCCH are both QCLed with SS / PBCH block A. Therefore, the UE can perform reception based on the reception parameters received when receiving SS / PBCH block A when receiving the PDCCH and PDSCH used for paging.

[0385] According to embodiments of this disclosure, a base station can set a control resource set #0 for the UE as a control resource set for listening to PDCCHs used for paging and set a search space #0 as a search space. In this case, when sending PDCCHs and PDSCHs for paging to the UE, the base station can send the PDCCHs and PDSCHs for paging using the same (or similar) transmission parameters as when sending SS / PBCH blocks associated with control resource set #0. As an example, when sending the PDCCH for paging with control resource set #0, the base station can send the PDCCH for paging using the same transmission beam used when sending SS / PBCH blocks, and can send the PDSCH for paging using the same transmission beam used when sending SS / PBCH blocks scheduled by the PDCCH for paging.

[0386] The second embodiment of this disclosure proposes a method for assuming QCL when the UE is listening to the paging PDCCH, where the UE is configured with a control resource set #0 (first control resource set or common control resource set) as the control resource set for listening to the PDCCH from the base station and is configured with a search space #X (X≠0) whose search space ID is not 0 (first search space or common search space).

[0387] If the paging search space is set to search space #X (X≠0) where the search space ID is not 0, then the UE can listen for the (i_s+1)th paging opportunity. Here, (i_s+1) can be understood as the index indicating the paging opportunity. A paging opportunity can be represented by "S". The paging time is composed of X consecutive PDCCH listening opportunities. Here, "S" can correspond to the actual number of SS / PBCH blocks sent, and the corresponding information can be transmitted from the base station to the UE as a specific parameter of the System Information Block (SIB) (e.g., ssb-PositionsInBurst). 'X' can correspond to the number of PDCCH listening opportunities per SS / PBCH block in the paging time set by the base station to the UE (e.g., higher-layer signaling parameter nrofPDCCH-MontiroingOccasionPerSSB-InPO), and if no corresponding configuration information is available, the UE can assume X=1 or a predetermined value. The [x]th paging time... The [S+K] PDCCH monitoring timing (where x = 0, 1, 2, ..., X-1 and can be defined as K = 1, 2, 3, ..., S) can correspond to the Kth transmitted SS / PBCH block. Starting from the first PDCCH monitoring timing in the paging frame, PDCCH monitoring timings that do not overlap with uplink (UL) symbols can be numbered sequentially from 0. In this case, if the configuration information firstPDCCH-MonitoringOccasionOfPO as the first PDCCH monitoring timing is set via higher-layer signaling, then the starting (first) PDCCH monitoring timing number of the (i_s+1)th paging timing can correspond to the (i_s+1)th value in the firstPDCCH-MonitoringOccasionOfPO parameter. If firstPDCCH-MonitoringOccasionOfPO is not set via higher-layer signaling, then the starting (first) PDCCH monitoring timing number of the (i_s+1)th paging timing can be the same as the i_s value. S X is the same. If X>1, then when the UE detects the PDCCH corresponding to the P-RNTI at a certain paging time, the UE does not need to perform listening for the rest of the corresponding paging time or perform subsequent PDCCH listening.

[0388] Figure 16 An example of a paging method according to an embodiment of the present disclosure is shown when the search space used for listening to the PDCCH used for paging corresponds to search space #X (X≠0). Search space #X (X≠0) means a search space whose search space ID is not 0 as described above.

[0389] Reference Figure 16The UE can be configured from the base station with a DRX period and T 1605 for paging. During time period T, there may be one or more paging frames PF 1601. Furthermore, one or more paging opportunities 1602 may exist within any paging frame 1601. Additionally, one or more PDCCH listening opportunities (PDCCH MO) 1603 may exist within any paging opportunity 1602. Any UE can determine the paging frame 1601 and paging opportunity 1602 within time period T 1605 for listening to the PDCCH used for paging (e.g., a PDCCH with a CRC set or scrambled using P-RNTI) based on its own UE ID UE_ID. As an example, the paging frame and paging opportunity can be determined based on Equations 4 and 5 above. In other words, the paging frame can be determined by Equation 4, and the paging opportunity index i_s can be determined by Equation 5.

[0390] Based on Equations 4 and 5 above, the group of UEs used to listen for a specific paging timing B in a specific paging frame A can be determined. More specifically, when there are M UEs with different UE_IDs as an example, each UE can... Figure 16 The system determines one of the N paging frames in time period T 1601 based on the UE_ID assigned to it (Ref. 4). Through this process, M UEs can be equally distributed across N paging frames. In other words, a UE group consisting of approximately M' = M / N UEs can be allocated within a single paging frame. UEs in a UE group of a specific paging frame A can determine a paging opportunity B based on their UE_ID among Ns (which is the number of paging opportunities existing in a paging frame of paging frame A) paging opportunities 1602. Through this process, a paging opportunity 1602 can be reassigned to a UE group consisting of M'' = M' / Ns = (M / N) / Ns UEs. As a result, with N paging frames 1601 in time period T 1601 and Ns paging opportunities 1602 in each paging frame, M UEs can be equally distributed across N paging frames. On Ns paging occasions, the number of UEs in the UE group listening to a specific paging occasion can be approximately M''=(M / N) / Ns.

[0391] One or more PDCCH listening opportunities 1603 can exist within a paging opportunity 1602. For example, X can exist. S PDCCH listening opportunities, where 'X' can correspond to the number of PDCCH listening opportunities per SS / PBCH block in the paging opportunities set by the base station to the UE (e.g., higher-layer signaling parameter nrofPDCCH-MontiroingOccasionPerSSB-InPO), 'S' can correspond to the actual number of SS / PBCH blocks (SSBs) sent, and if no corresponding configuration information is available, the UE can assume X=1 or a preset value. The [x]th PDCCH listening opportunity in the paging opportunities The [S+K] PDCCH listening times (where x = 0, 1, 2, ..., X-1 and can be defined as K = 1, 2, 3, ..., S) correspond to the Kth transmitted SS / PBCH block. Starting from the first PDCCH listening time in the paging frame, PDCCH listening times that do not overlap with uplink (UL) symbols can be numbered sequentially from 0. Figure 16 In the example shown, X=1 and S=4, therefore, four (i.e., X) S) A PDCCH listening opportunity 1603 can exist within a paging opportunity 1602. The UE can determine the paging opportunity B in paging frame A based on equations 4 and 5 and listen to all PDCCH listening opportunities existing in paging opportunity B. In this case, each PDCCH listening opportunity listened to by the UE can correspond to a different SS / PBCH block.

[0392] According to embodiments of this disclosure, when a UE is configured with a control resource set #0 as a control resource set for listening to paging PDCCHs and is configured with a search space #X (X≠0) whose search space ID is not 0 as a search space, the UE can listen to multiple PDCCH listening opportunities in one paging opportunity as described above, and the PDCCH listening opportunities can correspond to different SS / PBCHs respectively. In this case, as a result, one control resource set #0 for the UE to listen to PDCCHs corresponds to different SS / PBCHs. Generally, when the UE listens to PDCCHs, a QCL assumption is made for the DMRS antenna port of the PDCCH transmitted in one control resource set. In the above paging method, one control resource set #0 can correspond to different SS / PBCHs, and the method of UE listening to PDCCHs or the QCL assumption method may also be required.

[0393] According to embodiments of this disclosure, when a UE is configured with a control resource set #0 as a control resource set for listening to the paging PDCCH and is configured with a search space #X (X≠0) whose search space ID is not 0 as a search space, the UE can control the reception operation of the paging PDSCH and the paging PDCCH by a method corresponding to at least one or more of the following methods or combinations.

[0394] [Method 1]

[0395] When a UE is configured with control resource set #0 as the control resource set for listening to PDCCHs used for paging and is configured with search space #X (X≠0) as the search space, the UE may assume that for all PDCCHs receivable at a specific paging time B in a specific paging frame A, the DMRS antenna port of the PDCCH and the DMRS antenna port of the PDSCH scheduled with the PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D.

[0396] In a specific example, the UE can receive SS / PBCH block A and receive configuration information about control resource set #0 from the received PBCH and configuration information about search space #X (X≠0) from SIB1. The UE can listen for the PDCCH used for paging based on the received control resource set #0 and search space #X (X≠0). In this case, the UE can listen for the paging PDCCH at multiple PDCCH listening times within a specific paging time B in a specific paging frame A. In this case, the UE can assume that the DMRS antenna ports of the PDCCHs receivable at all corresponding PDCCH listening times and the DMRS antenna ports of the PDSCHs scheduled by the PDCCH are quasi-co-located with SS / PBCH block A. Therefore, the UE can perform reception based on the reception parameters when receiving SS / PBCH block A when receiving the PDCCH and PDSCH used for paging.

[0397] [Method 2]

[0398] When a UE is configured with control resource set #0 as the control resource set for listening to PDCCHs used for paging and is configured with search space #X (X≠0) as the search space, the UE can listen to the PDCCHs used for paging at one of the multiple PDCCH listening times in a specific paging time B within a specific paging frame A, corresponding to the PDCCH listening time of the SS / PBCH block associated with control resource set #0. Furthermore, the UE can assume that the DMRS antenna port of the PDCCH and the DMRS antenna port of the PDSCH scheduled by the PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D.

[0399] In a specific example, the UE can receive SS / PBCH block A and receive configuration information about control resource set #0 from the received PBCH, and configuration information about search space #X (X≠0) from SIB1. The UE can listen for the PDCCH used for paging based on the received control resource set #0 and search space #X (X≠0). In this case, for the UE, X The S PDCCH listening opportunities can exist in a specific paging opportunity B within a specific paging frame A, and the [x]th PDCCH listening opportunity in paging opportunity B... [S+K] (where x = 0, 1, 2, ..., X-1 and can be defined as K = 1, 2, 3, ..., S) The PDCCH listening timing can correspond to the Kth transmitted SS / PBCH block. If SS / PBCH block A corresponds to the Kth... A SS / PBCH block, then UE can be in X [x] among the S PDCCH listening opportunities S+K A The UE listens for PDCCHs used for paging during (x = 0, 1, 2, ..., X-1) PDCCH listening opportunities. Furthermore, the UE can assume that the DMRS antenna ports of the receivable PDCCHs and the DMRS antenna ports of the PDSCHs scheduled by the PDCCHs are quasi-co-located with SS / PBCH block A during all corresponding PDCCH listening opportunities. Therefore, the UE can perform reception based on the reception parameters when receiving SS / PBCH block A when receiving PDCCHs and PDSCHs used for paging.

[0400] [Method 3]

[0401] When a UE is configured with control resource set #0 as the control resource set for listening to the PDCCH used for paging and is configured with search space #X (X≠0) as the search space, if the UE listens for the paging PDCCH at multiple PDCCH listening times in a specific paging time B within a specific paging frame A, the UE can assume QCL based on the SS / PBCH block corresponding to each PDCCH listening time and receive the PDCCH and PDSCH used for paging. More specifically, X The S PDCCH listening opportunities can exist in a specific paging opportunity B within a specific paging frame A, and the M=[x]th PDCCH listening opportunity in paging opportunity B... [S+K] (where x=0, 1, 2,...,X-1 and can be defined as K=1, 2, 3,..., S) The PDCCH listening time can correspond to the Kth transmitted SS / PBCH block. The UE can assume that the DMRS antenna port of the PDCCH that can be received at the Mth PDCCH listening time and the DMRS antenna port of the PDSCH scheduled by the PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D with respect to the Kth SS / PBCH block.

[0402] In a specific example, the UE can receive SS / PBCH block A and receive configuration information about control resource set #0 from the received PBCH, and configuration information about search space #X (X≠0) from SIB1. The UE can listen for the PDCCH used for paging based on the received control resource set #0 and search space #X (X≠0). In this case, for the UE, X The S PDCCH listening opportunities can exist in a specific paging opportunity B within a specific paging frame A, and the M=[x]th PDCCH listening opportunity in paging opportunity B... [S+K] (where x=0, 1, 2,..., X-1 and can be defined as K=1, 2, 3,..., S) The PDCCH listening time can correspond to the Kth transmission SS / PBCH block. When listening for paging PDCCH at any Mth PDCCH listening time, the UE can assume that the DMRS antenna ports of the PDCCH receivable at the Mth PDCCH listening time and the DMRS antenna ports of the PDSCH scheduled by the PDCCH are quasi-co-located with the Kth transmission SS / PBCH. Therefore, when receiving the PDCCH and PDSCH for paging, the UE can determine the reception parameters based on the different SS / PBCH blocks at each PDCCH listening time.

[0403] [Method 4]

[0404] When a UE is configured with control resource set #0 as the control resource set for listening to PDCCHs used for paging and is configured with search space #X (X≠0) as the search space, if the UE listens for paging PDCCHs at multiple PDCCH listening times in a specific paging time B within a specific paging frame A, the UE can assume a QCL based on the SS / PBCH block corresponding to each PDCCH listening time and receive the paging PDCCH and paging PDSCH. In this case, the SS / PBCH associated with the configured control resource set #0 can be considered to determine the SS / PBCH corresponding to each PDCCH listening time. For example, multiple PDCCH listening times in a specific paging time B can be sequentially associated with the transmitted SS / PBCH blocks, starting from the SS / PBCH block L associated with the control resource set #0 for listening to PDCCHs. Specifically, when the total number of transmitted SS / PBCH blocks is S, the SS / PBCH block associated with the control resource set #0 of the paging PDCCH heard by the UE is SSB#L, and there is a PDCCH listening opportunity {MO#1, MO#1, MO#2, MO#3, ..., MO#N} in a specific paging opportunity B, the PDCCH listening opportunities can correspond to {SSB#L, SSB#(L+1), SSB#(L+2), ..., SSB#(mod(L+S-1,S))} respectively.

[0405] More specifically, X can exist in a specific paging time B within a specific paging frame A. S PDCCH listening opportunities. In paging opportunity B, the M=[x]th... [S + K] (where x = 0, 1, 2, ..., X-1 and K = L, L+1, L+2, L+3, ..., mod(L+S-1,S)), where mod(L+S-1,S) is the modulo operation expressed as (L+S-1) mod S. Each of the S PDCCH listening opportunities can correspond to the Kth transmitted SS / PBCH block. In this case, the Lth SS / PBCH block can correspond to the SS / PBCH block associated with control resource set #0. The UE can assume that the DMRS antenna port of the PDCCH receivable at the Mth PDCCH listening opportunity and the DMRS antenna port of the PDSCH scheduled by the PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D, with respect to the Kth SS / PBCH block. When listening for a paging PDCCH at any Mth PDCCH listening opportunity, the UE can assume that the DMRS antenna ports of the PDCCH receivable at the Mth PDCCH listening opportunity and the DMRS antenna ports of the PDSCH scheduled by the PDCCH are quasi-co-located with the Kth transmission SS / PBCH. Therefore, when receiving a PDCCH and a PDSCH for paging, the UE can determine the reception parameters based on the different SS / PBCH blocks at each PDCCH listening opportunity.

[0406] [Method 5]

[0407] When a UE is configured with control resource set #0 as the control resource set for listening to PDCCHs used for paging and is configured with search space #X (X≠0) as the search space, the UE can listen to the paging PDCCH at multiple PDCCH listening times in a specific paging time B within a specific frame X. In this case, any of the multiple PDCCH listening times can correspond to a PDCCH listening time associated with control resource set #0 associated with the Kth SS / PBCH block. In other words, multiple PDCCH listening times can consist of PDCCH listening times associated with control resource sets #0 associated with different SS / PBCH blocks. Therefore, the UE can listen to the paging PDCCH in control resource set #0 associated with the Kth SS / PBCH block corresponding to the Mth PDCCH listening time to listen to the paging PDCCH at the Mth PDCCH listening time. For example, X The S PDCCH listening opportunities can exist in a specific paging opportunity B within a specific paging frame A, and the Mth paging opportunity is [x] [S+K] (where x=0, 1, 2,..., X-1 and can be defined as K=1, 2,3,..., S) The PDCCH listening time can correspond to the Kth transmission SS / PBCH block. When listening for paging PDCCH at the Mth PDCCH listening time, the UE can listen for the paging PDCCH in the control resource set #0 associated with the Kth SS / PBCH block. Furthermore, the UE can assume that the DMRS antenna port of the PDCCH receivable at the Mth PDCCH listening time and the DMRS antenna port of the PDSCH scheduled by the PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D with respect to the Kth SS / PBCH block.

[0408] [Method 6]

[0409] When the UE is configured with control resource set #0 as the control resource set for listening to the paging PDCCH and with search space #X (X≠0) as the search space, the QCL for the DMRS antenna port of the PDCCH and the antenna port of the PDSCH scheduled by the PDCCH is assumed to be arbitrarily determined by the UE's implementation. For example, the UE can perform a receive operation on the paging PDCCH and the paging PDSCH based on at least one of the operations described in methods 1 to 5 above.

[0410] As described above, according to embodiments of this disclosure, the base station can set control resource set #0 for the UE as the control resource set for paging PDCCH and set search space #0 as the search space. In this case, the base station can send paging PDCCHs with the same information to the UE at multiple PDCCH listening times in any paging time B of any paging frame A. In this case, when sending a paging PDCCH to the UE at any Mth PDCCH listening time among the multiple PDCCH listening times, the base station can send the PDSCH and PDCCH scheduled by the paging PDCCH based on the same (or similar) transmission parameters as when sending the Kth SS / PBCH block corresponding to the Mth PDCCH listening time. As an example, when sending the paging PDCCH at the Mth PDCCH listening time, the base station can use the same transmission beam as when sending the corresponding Kth SS / PBCH block to send the paging PDCCH and PDSCH.

[0411] Furthermore, according to embodiments of this disclosure, it may not be expected that the UE will be configured with control resource set #0 as the control resource set for listening to paging PDCCH and with a search space #X (X≠0) whose search space ID is not 0. If the corresponding configuration information is received, the UE can treat the received configuration information as an error and perform a default operation (or a fallback operation) when the configuration information is incorrect. As an example, when it is determined that the received configuration information is incorrect, the UE can ignore and discard the configuration information. In this case, the UE can receive the configuration information again.

[0412] The third embodiment of this disclosure proposes a method for assuming QCL when the UE is listening to the paging PDCCH, where the UE is configured with a control resource set #X (which may be referred to as a second control resource set or a specific control resource set) whose control resource set ID is not 0 as the control resource set for listening to the PDCCH and is configured with a search space #Y (Y≠0) whose search space ID is not 0 (which may be referred to as a second search space or a specific search space) as the search space.

[0413] According to embodiments of this disclosure, when a UE is configured with a control resource set #X (X≠0) as a control resource set for listening to a PDCCH for paging and is configured with a search space #Y (Y≠0) as a search space, the UE can control the PDSCH reception operation for paging and the PDCCH for paging through a method corresponding to at least one or more of the following methods or combinations.

[0414] When a UE is configured with a control resource set #X (X≠0) as the control resource set for listening to paging PDCCH and a search space #Y (Y≠0) as the search space, if the UE listens for paging PDCCH at multiple PDCCH listening times in a specific paging time B within a specific paging frame A, the UE can assume QCL based on the SS / PBCH block corresponding to each PDCCH listening time and receive the paging PDCCH and PDSCH. More specifically, X The S PDCCH listening opportunities can exist in a specific paging opportunity B within a specific paging frame A, and the M=[x]th PDCCH listening opportunity in paging opportunity B... [S+K] (where x=0, 1, 2,..., X-1 and can be defined as K=1, 2, 3,..., S) The PDCCH listening time can correspond to the Kth transmitted SS / PBCH block. The UE can assume that the DMRS antenna port of the PDCCH that can be received at the Mth PDCCH listening time and the DMRS antenna port of the PDSCH scheduled by the PDCCH are quasi-co-located with respect to at least one of QCL-Type A and QCL-Type D with respect to the Kth SS / PBCH block.

[0415] Embodiments of this disclosure are described with specific examples. The UE can receive configuration information about the control resource set #X (X≠0) and the search space #Y (Y≠0) from the base station via higher-layer signaling (e.g., SIB1). The UE can listen for the PDCCH used for paging based on the received configuration information about the control resource set #X and the search space #Y (Y≠0). In this case, for the UE, X The S PDCCH listening opportunities can exist in a specific paging opportunity B within a specific paging frame A, and the M=[x]th PDCCH listening opportunity in paging opportunity B... [S+K] (where x=0, 1, 2,..., X-1 and can be defined as K=1,2, 3,..., S) The PDCCH listening time can correspond to the Kth transmission SS / PBCH block. When listening for paging PDCCH at any Mth PDCCH listening time, the UE can assume that the DMRS antenna ports of the PDCCH receivable at the Mth PDCCH listening time and the DMRS antenna ports of the PDSCH scheduled by the PDCCH are quasi-co-located with the Kth transmission SS / PBCH. Therefore, when receiving the PDCCH and PDSCH for paging, the UE can determine the reception parameters based on the different SS / PBCH blocks at each PDCCH listening time.

[0416] According to embodiments of this disclosure, the base station can set a control resource set #X (X≠0) for the UE as a control resource set for listening to the PDCCH used for paging and set a search space #Y (Y≠0) as a search space. In this case, the base station can send a paging PDCCH with the same information to the UE at multiple PDCCH listening times in any paging time B of any paging frame A. In this case, when sending a paging PDCCH to the UE at any Mth PDCCH listening time among the multiple PDCCH listening times, the base station can send the PDSCH for paging and the PDCCH for paging scheduled by the PDCCH based on the same (or similar) transmission parameters as when sending the Kth SS / PBCH block corresponding to the Mth PDCCH listening time. As an example, when sending the paging PDCCH at the Mth PDCCH listening time, the base station can use the same transmission beam as when sending the corresponding Kth SS / PBCH block to send the PDCCH and PDSCH for paging.

[0417] According to embodiments of this disclosure, it may not be expected that the UE will be configured with a control resource set #X (X≠0) as the control resource set for listening to the paging PDCCH and with a search space #Y (Y≠0) whose search space ID is not 0 as the search space. If the corresponding configuration information is received, the UE can treat the received configuration information as an error and perform a default operation (or a fallback operation) when the configuration information is incorrect. As an example, when it is determined that the received configuration information is incorrect, the UE can ignore and discard the configuration information. In this case, the UE can receive the configuration information again.

[0418] All the above embodiments of this disclosure can be implemented in combination. As an example, the above embodiments can be combined as follows.

[0419] As an example of a combined embodiment, as in the first embodiment described above, when the UE is configured with a control resource set #0 as a control resource set for paging PDCCH and a search space #0 as a search space via configuration information from the base station, the UE may assume that the DMRS antenna port of the PDCCH received through the control resource set #0 and the DMRS antenna port of the PDSCH scheduled by the corresponding PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D for the SS / PBCH block associated with the control resource set #0.

[0420] Furthermore, as in the second embodiment described above, when the UE is configured with control resource set #0 as the control resource set for paging PDCCH via configuration information from the base station and is configured with search space #X (X≠0) as the search space, the UE can assume that for all PDCCH listening times receivable at a specific paging time B in a specific paging frame A, the DMRS antenna port of the PDCCH and the DMRS antenna port of the PDSCH scheduled by the corresponding PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D.

[0421] Furthermore, as in the third embodiment described above, when the UE is configured with a control resource set #X (X≠0) as the control resource set for listening to paging PDCCH and a search space #Y (Y≠0) as the search space via configuration information from the base station, if the UE listens to paging PDCCH at multiple PDCCH listening times in a specific paging time B within a specific paging frame A, the UE can assume QCL based on the SS / PBCH block corresponding to each PDCCH listening time and receive the PDCCH and PDSCH for paging. More specifically, X The S PDCCH listening opportunities can exist in a specific paging opportunity B within a specific paging frame A, and the M=[x]th PDCCH listening opportunity in paging opportunity B... [S+K] (where x=0, 1, 2,..., X-1 and can be defined as K=1, 2, 3,..., S) The PDCCH listening time can correspond to the Kth transmitted SS / PBCH block. The UE can assume that the DMRS antenna port of the PDCCH that can be received at the MPDCCH listening time and the DMRS antenna port of the PDSCH scheduled by the PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D with respect to the Kth SS / PBCH block.

[0422] As another example of the combined embodiment, as in the first embodiment described above, when the UE is configured with control resource set #0 as the control resource set for paging PDCCH and with search space #0 as the search space via configuration information from the base station, the UE may assume that the DMRS antenna port of the PDCCH received through control resource set #0 and the DMRS antenna port of the PDSCH scheduled by the corresponding PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D for the SS / PBCH block associated with control resource set #0.

[0423] Furthermore, as in the second embodiment described above, when the UE is configured with a control resource set #0 as the control resource set for paging PDCCH and a search space #X (X≠0) as the search space via configuration information from the base station, the UE can assume that for all PDCCH listening times that are receivable at a specific paging time B in a specific paging frame A, the DMRS antenna port of the PDCCH and the DMRS antenna port of the PDSCH scheduled by the corresponding PDCCH are quasi-co-located with respect to at least one of QCL-Type A or QCL-Type D.

[0424] Furthermore, as in the third embodiment described above, it may not be expected that the UE will be configured with a control resource set #X (X≠0) as the control resource set for listening to the paging PDCCH and with a search space #Y (Y≠0) whose search space ID is not 0. In this case, if the corresponding configuration information is received, the UE can consider the received configuration information as an error and perform a default operation (or a fallback operation) when the configuration information is incorrect.

[0425] Figure 17a This is a view illustrating the operation of a base station according to an embodiment of the present disclosure.

[0426] Reference Figure 17a The operation of the base station is described. In step 1700, the base station sends configuration information for paging. The configuration information for paging may include at least one of information about the set of control resources associated with the PDCCH used for paging and information about the search space. The configuration information for paging can be provided to the UE via higher-layer signaling (MIB, SIB, or RRC information) or DCI of the base station. The configuration information for paging can have various configurations in each or possible combinations of the first to third embodiments described above, and the base station can configure and send the configuration information for paging in various forms based on network conditions, the channel state of the UE, or determined conditions. Figure 17a In the example, the configuration information used for paging can have, for example, n different configurations.

[0427] The base station can transmit PDCCH and PDSCH for paging based on the transmitted configuration information. Figure 17aIn steps 1701 and 1702, when the transmitted configuration information corresponds to configuration 1, the base station transmits a PDCCH for paging at the PDCCH listening time determined according to configuration 1 and transmits a paging message scheduled according to the PDCCH on the PDSCH. In steps 1701 and 1703, when the transmitted configuration information corresponds to configuration n, the base station transmits a PDCCH for paging at the PDCCH listening time determined according to configuration n and transmits a paging message scheduled according to the PDCCH on the PDSCH. In this case, the parameters used when transmitting a synchronization signal block (SSB) with a QCL relationship to the PDCCH and PDSCH (e.g., using the same transmission beam as when transmitting the SSB) can be used to transmit the PDCCH and PDSCH for paging.

[0428] Furthermore, in this disclosure, the base station may: transmit configuration information including at least one of information about a control resource set and information about a search space related to a PDCCH used for paging; identify a synchronization signal block (SSB) corresponding to a PDCCH listening time in the control resource set and the search space based on the configuration information; and perform PDCCH transmission and PDSCH transmission for paging using the same transmission beam as when transmitting the synchronization signal block (SSB).

[0429] Figure 17b This is a view illustrating the operation of a UE according to an embodiment of the present disclosure.

[0430] Reference Figure 17b The operation of the UE is described. In step 1710, the UE receives configuration information for paging. The configuration information for paging may include at least one of information about the set of control resources associated with the PDCCH used for paging and information about the search space. The configuration information for paging can be provided to the UE via higher-layer signaling (MIB, SIB, or RRC information) or DCI from the base station. The configuration information for paging can have various configurations through each or possible combinations of the first to third embodiments described above. Figure 17b In the example, the configuration information used for paging can have, for example, n different configurations.

[0431] The UE can perform PDCCH listening and PDSCH reception for paging based on the received configuration information. Figure 17bIn steps 1711 and 1712, if the received configuration information corresponds to configuration 1, when listening to the PDCCH for paging at the PDCCH listening time determined according to configuration 1 to detect the PDCCH corresponding to the P-RNTI, the UE receives the PDCCH on the PDSCH and receives the paging message scheduled according to the PDCCH. In steps 1711 and 1713, if the received configuration information corresponds to configuration n, when listening to the PDCCH for paging at the PDCCH listening time determined according to configuration n to detect the PDCCH corresponding to the P-RNTI, the UE receives the PDCCH on the PDSCH and receives the PDSCH including the paging message scheduled according to the PDCCH. In this case, the parameters used when receiving a synchronization signal block (SSB) with a QCL relationship with the PDCCH and PDSCH (e.g., using the same receive beam as when receiving the SSB) can be used to send the PDCCH and PDSCH for paging.

[0432] Furthermore, in this disclosure, the UE may: receive configuration information including at least one of information about a control resource set and information about a search space related to a PDCCH used for paging; identify a synchronization signal block (SSB) corresponding to the PDCCH listening time in the control resource set and the search space set based on the configuration information; perform PDCCH listening for paging using the same receive beam as when receiving the synchronization signal block (SSB), and receive paging messages on a PDSCH scheduled via the PDCCH.

[0433] The methods described in the embodiments of this disclosure or in the claims can be implemented in hardware, software, or a combination of hardware and software.

[0434] When implemented in software, a computer-readable storage medium storing one or more programs (software modules) can be provided. One or more programs stored in the computer-readable storage medium are configured to be executed by one or more processors in an electronic device. The one or more programs include instructions that enable the electronic device to perform methods according to embodiments described in the specification or claims of this disclosure.

[0435] The program (software module or software) can be stored in: random access memory; non-volatile memory including flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM); disk storage devices; optical disc ROM; digital universal disc (DVD); or other types of optical storage devices or magnetic tape. Alternatively, the program can be stored in a memory consisting of all or some of these components. Multiple memories may be included as each component memory.

[0436] The program can be stored in an attachable storage device that can be accessed via a communication network such as the Internet, intranet, local area network (LAN), wide area network (WAN), or storage area network (SAN), or a combination thereof. The storage device can be connected to a device executing embodiments of this disclosure via an external port. Separate storage devices on the communication network can be connected to a device executing embodiments of this disclosure.

[0437] In the specific embodiments described above, components included in this disclosure are referred to in either singular or plural forms, depending on the particular embodiment presented. However, the singular or plural forms are chosen to suit the context presented for ease of description, and this disclosure is not limited to singular or plural components. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are also intended to include the plural forms.

[0438] Although specific embodiments of this disclosure have been described above, various changes may be made thereto without departing from the scope of this disclosure. Therefore, the scope of this disclosure should not be limited to the above embodiments, but should be precisely defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment (UE) configured to receive a paging message in a wireless communication system, the method comprising: Configuration information is received from the base station. The configuration information includes information about control resource sets in multiple control resource sets and information about search spaces in multiple search spaces related to the physical downlink control channel (PDCCH) used for paging. The configuration information is configured based on the channel state or network state of the UE among multiple configuration information that are configurable based on the multiple control resource sets and the multiple search spaces. Based on the received configuration information, the synchronization signal block SSB corresponding to the PDCCH listening time is identified in the control resource set and search space set; as well as Perform PDCCH listening for the paging using the same receive beam as when receiving the SSB, and receive the paging message on the Physical Downlink Shared Channel (PDSCH) scheduled through the PDCCH. Specifically, based on whether the control resource set is a common control resource set and whether the search space is a common search space, the received configuration information among the multiple configuration information is further configured for the UE.

2. The method according to claim 1, wherein, The PDCCH and PDSCH used for paging have a quasi-co-addressable (QCL) relationship with the SSB.

3. The method according to claim 1, wherein, The receive beam is determined based on the different SSBs at each PDCCH listening time.

4. The method according to claim 1, wherein, If, in the configuration information, the control resource set is set to the common control resource set, and the search space set is set to the common search space set, then the [x]th paging timing... S + K] PDCCH listening opportunities correspond to the Kth transmitted synchronization signal block, where x = 0, 1, 2, ..., X-1, and K = 1, 2, 3, ..., S, and where the paging opportunity is "S The set of X consecutive PDCCH listening opportunities, where S is the number of synchronization signal blocks actually sent, and X is the number of PDCCH listening opportunities per SSB in the paging opportunity.

5. The method according to claim 1, further comprising: If the received configuration information is not the configuration information expected by the UE, the received configuration information is considered to be an error. as well as The configuration information for paging is received again from the base station.

6. A user equipment (UE) in a wireless communication system, the UE comprising: transceiver; as well as Processor, the processor being configured to: The transceiver receives configuration information from the base station. The configuration information includes information about control resource sets in multiple control resource sets and information about search spaces in multiple search spaces, which are related to the physical downlink control channel (PDCCH) used for paging. The configuration information is configured based on the channel state or network state of the UE, and is one of multiple configuration information that can be configured based on the multiple control resource sets and the multiple search spaces. Based on the received configuration information, the synchronization signal block SSB corresponding to the PDCCH listening time is identified in the control resource set and search space set; as well as Perform PDCCH listening for the paging using the same receive beam as when receiving the SSB, and receive the paging message on the Physical Downlink Shared Channel (PDSCH) scheduled through the PDCCH. Specifically, based on whether the control resource set is a common control resource set and whether the search space is a common search space, the received configuration information among the multiple configuration information is further configured for the UE.

7. The UE according to claim 6, wherein, The UE is adapted to operate according to the method of any one of claims 2 to 5.

8. A method performed by a base station configured to transmit paging in a wireless communication system, the method comprising: Send configuration information, which includes information about control resource sets in multiple control resource sets and information about search spaces in multiple search spaces related to the physical downlink control channel (PDCCH) used for paging. The configuration information is configured based on the channel state or network state of the user equipment (UE) among multiple configuration information that are configurable based on the multiple control resource sets and the multiple search spaces. Based on the transmitted configuration information, the synchronization signal block SSB corresponding to the PDCCH listening timing is identified in the control resource set and search space set; and The PDCCH transmission and Physical Downlink Shared Channel (PDSCH) transmission for paging are performed using the same transmission beam as when transmitting the SSB. Specifically, based on whether the control resource set is a common control resource set and whether the search space is a common search space, the received configuration information among the multiple configuration information is further configured for the UE.

9. The method according to claim 8, wherein, The PDCCH and PDSCH used for paging have a quasi-co-addressable (QCL) relationship with the SSB.

10. The method of claim 8, wherein, The transmit beam is determined based on the different SSBs at each PDCCH listening time.

11. The method of claim 8, wherein If, in the configuration information, the control resource set is set to the common control resource set, and the search space set is set to the common search space set, then the [x]th paging timing... The S + K] PDCCH listening opportunities correspond to the Kth transmitted synchronization signal block, where, x = 0, 1, 2, ..., X-1, and K = 1, 2, 3, ..., S, where the paging timing is "S The set of X consecutive PDCCH listening opportunities, where S is the number of synchronization signal blocks actually sent, and X is the number of PDCCH listening opportunities per SSB in the paging opportunity.

12. The method according to claim 8, wherein, If, in the configuration information, the control resource set is set to a specific control resource set, and the search space set is set to a specific search space set, then X exists at a specific paging time in a specific paging frame. S PDCCH listening opportunities, and the Mth = [x]th paging opportunity in the specific paging opportunity S + K] PDCCH listening opportunities correspond to the Kth transmitted SSB, where x = 0, 1, 2, ..., X-1, and K = 1, 2, 3, ..., S.

13. A base station in a wireless communication system, the base station comprising: transceiver; as well as Processor, the processor being configured to: Send configuration information, which includes information about control resource sets in multiple control resource sets and information about search spaces in multiple search spaces related to the physical downlink control channel (PDCCH) used for paging. The configuration information is configured based on the channel state or network state of the user equipment (UE) among multiple configuration information that are configurable based on the multiple control resource sets and the multiple search spaces. Based on the transmitted configuration information, the synchronization signal block SSB corresponding to the PDCCH listening timing is identified in the control resource set and search space set; and The PDCCH transmission and Physical Downlink Shared Channel (PDSCH) transmission for paging are performed using the same transmission beam as when transmitting the SSB. Specifically, based on whether the control resource set is a common control resource set and whether the search space is a common search space, the received configuration information among the multiple configuration information is further configured for the UE.

14. The base station according to claim 13, wherein, The base station is adapted to operate according to the method of any one of claims 9 to 12.

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