Method and apparatus for supporting energy saving in wireless communication system

Abstract

The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond 4G communication systems such as LTE. A method performed by a BS in a wireless communication system may include: transmitting configuration information of a DTx to a terminal via high layer signaling; transmitting information indicating activation or deactivation of the DTx to the terminal via the DCI or the MAC CE; and synchronizing with the terminal based on the configuration information of the DTx to perform the DTx and perform the DTx.

Description

Technical Field

[0001] The present disclosure generally relates to wireless communication systems, and more particularly, to methods and apparatuses for supporting energy saving in wireless communication systems. Background Art

[0002] To meet the growing demand for wireless data services since the deployment of the 4th generation (4G) communication systems, efforts have been made to develop improved 5th generation (5G) or pre-5G communication systems. The 5G or pre-5G communication systems may also be referred to as "beyond 4G network" or "post long term evolution (LTE) system".

[0003] The 5G communication systems are expected to be implemented in higher frequency (millimeter wave) bands (e.g., 28 GHz or 60 GHz bands) to achieve higher data rates. To reduce the propagation loss of radio waves and increase the transmission distance, the use of beamforming, massive multiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technologies is being discussed in 5G communication systems.

[0004] In addition, in 5G communication systems, developments for system network improvements are being made based on advanced small cells, cloud radio access network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-points (CoMP), receiver-side interference cancellation, etc.

[0005] In the 5G system, hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM), and filter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) have been developed as advanced access technologies.

[0006] The Internet is evolving from a human-centric connected network in which humans create and consume information to an Internet of Things (IoT) network in which information is exchanged and processed between distributed components (i.e., things, such as objects). The Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology by connecting to a cloud server, is also emerging.

[0007] To realize the IoT, technical elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, technologies such as sensor networks, machine-to-machine (M2M), and machine type communication (MTC) have been studied to connect things. In the IoT environment, intelligent Internet technology (IT) services can be provided by collecting and analyzing data generated by networked objects. Through the integration and complexity between existing information technology and various industries, the IoT can be applied to various fields, such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart appliances, and advanced medical services.

[0008] Various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor networks, M2M, and MTC are being realized through 5G communication technologies such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology is also an example of the integration of 5G and IoT technologies.

[0009] Considering the development of wireless communication from generation to generation, these technologies have been developed mainly for human-targeted services (such as voice calls, multimedia services, and data services). However, after the commercialization of 5G communication systems, the number of connected devices is expected to grow exponentially. These devices will be increasingly connected to the communication network. Examples of connected devices can include vehicles, robots, drones, household appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment.

[0010] Mobile devices are also expected to evolve in various form factors, such as augmented reality (AR) glasses, virtual reality (VR) headsets, and holographic devices.

[0011] To provide various services by connecting hundreds of billions of devices and things in the 6th generation (6G) era, efforts are also being made to develop improved 6G communication systems. The 6G communication system can be called a super 5G system.

[0012] The 6G communication system, which is expected to be commercialized around 2030, will have a peak data rate of trillion (1000 gigabit) bits per second (bps) and a radio latency of less than 100 μsec, and will thus be approximately 50 times faster and have 1 / 10 of the radio latency of 5G communication systems.

[0013] To achieve such high data rates and ultra-low latency, it has been considered to implement the 6G communication system in the terahertz (THz) band (e.g., 95 gigahertz (GHz) to 3 THz band). Since the path loss and atmospheric absorption in the THz band are more severe than those in the millimeter wave band introduced in 5G, technologies that can ensure the signal transmission distance (i.e., coverage) are expected to become even more crucial. Accordingly, to ensure proper coverage, it is expected to be necessary to develop radio frequency (RF) components, antennas, new waveforms with better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive MIMO, FD-MIMO, array antennas, and multi-antenna transmission technologies (such as massive antennas). In addition, new technologies for improving the signal coverage in the THz band are being discussed, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS).

[0014] To improve spectral efficiency and overall network performance, the following technologies have been developed for 6G communication systems: full-duplex technology that enables uplink (UL) and downlink (DL) transmissions to use the same frequency resources simultaneously; network technologies that utilize satellites, high-altitude platform stations (HAPS), etc. in an integrated manner; improved network architectures that support mobile base stations (BSs), etc. and achieve optimized and automated network operations; dynamic spectrum sharing technology via conflict avoidance based on predictions of spectrum usage; the use of artificial intelligence (AI) in wireless communication to improve overall network operations by leveraging AI from the design phase of 6G development and internalizing end-to-end AI support functions; and next-generation distributed computing technology that overcomes the limitations of user equipment (UE) computing power through ultra-high-performance communication and computing resources (such as mobile edge computing (MEC), cloud, etc.) reachable over the network. In addition, by designing new protocols to be used in 6G communication systems, developing mechanisms for implementing hardware-based security environments and secure use of data, and developing technologies for maintaining privacy, efforts are ongoing to enhance connectivity between devices, optimize the network, promote the softwareization of network entities, and increase the openness of wireless communication.

[0015] Research and development of 6G communication systems in terms of hyper-connectivity (including person to machine (P2M) and M2M) are expected to enable the next hyper-connected experiences. In particular, services such as true immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas are expected to be provided through 6G communication systems. In addition, services such as remote surgery, industrial automation, and emergency response for enhanced security and reliability will be provided through 6G communication systems, enabling these technologies to be applied to various fields such as industry, healthcare, automotive, and household appliances.

[0016] With the recent development of 5G / 6G communication systems considering the environment, there is also a need for a method to reduce the energy consumption of BSs. Summary of the Invention

[0017] Solution to the Problem

[0018] The present disclosure at least addresses the above disadvantages and at least provides the following advantages.

[0019] An aspect of the present disclosure is to provide a discontinuous transmission (DTx) method for reducing the energy consumption of a BS in a wireless communication system.

[0020] Another aspect of the present disclosure is to provide a DTx mode for power saving of a BS, where DTx information is configured via higher layer signaling (e.g., radio resource control (RRC) or system information block (SIB)), and the DTx operation for power saving of the BS is initiated based on DTx activation via higher layer signaling and layer 1 (L1) signaling.

[0021] According to an aspect of the present disclosure, a method performed by a BS in a wireless communication system is provided. The method includes: sending configuration information of DTx to a terminal via higher layer signaling; sending information indicating activation or deactivation of DTx to the terminal via DL control information (DCI) or medium access control (MAC) control element (CE); and synchronizing with the terminal based on the configuration information of DTx to perform DTx and execute DTx.

[0022] According to another aspect of the present disclosure, a method performed by a terminal is provided. The method includes: receiving configuration information of DTx from a BS via higher layer signaling; receiving information indicating activation or deactivation of DTx from the BS via DCI or MAC CE; and synchronizing with the BS based on the configuration information of DTx to perform DTx and execute DTx.

[0023] According to another aspect of the present disclosure, a station used in a wireless communication system is provided. The BS includes a transceiver and a processor functionally coupled to the transceiver. The processor is configured to: send configuration information of DTx to a terminal via higher layer signaling; send information indicating activation or deactivation of DTx to the terminal via DCI or MAC CE; and synchronize with the terminal based on the configuration information of DTx to perform DTx and execute DTx.

[0024] According to another aspect of the present disclosure, a terminal used in a wireless communication system is provided. The terminal includes a transceiver and a processor functionally coupled to the transceiver. The processor is configured to: receive configuration information of DTx from a BS via higher layer signaling; receive information indicating activation or deactivation of DTx from the BS via DCI or MAC CE; and synchronize with the BS based on the configuration information of DTx to perform DTx and execute DTx. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, where:

[0026] Figure 1 Shows the time - frequency domain in a wireless communication system according to an embodiment;

[0027] Figure 2 Shows the time - slot structure in a wireless communication system according to an embodiment;

[0028] Figure 3 Shows the beam - scanning operation and time - domain mapping structure of a synchronization signal (SS) according to an embodiment;

[0029] Figure 4 Shows the SS block (SSB) considered in a wireless communication system according to an embodiment;

[0030] Figure 5 and Figure 6 Shows various cases of transmitting SSB according to an embodiment;

[0031] Figure 7 Shows the case of transmitting SSB according to the sub - carrier spacing (SCS) within 5 ms in a wireless communication system according to an embodiment;

[0032] Figure 8 Shows the demodulation reference signal (DMRS) patterns (type 1 and type 2) for communication between a BS and a terminal according to an embodiment;

[0033] Figure 9 Shows the channel estimation using DMRS received from the physical UL shared channel (PUSCH) according to an embodiment;

[0034] Figure 10 Shows the method of re - configuring SSB transmission via dynamic signaling according to an embodiment;

[0035] Figure 11 Shows the method of re - configuring the bandwidth (BW) and the BW part (BWP) via dynamic signaling according to an embodiment;

[0036] Figure 12 Shows the method of re - configuring discontinuous reception (DRX) via dynamic signaling according to an embodiment;

[0037] Figure 13 Shows the antenna adaptation method of a BS for energy saving according to an embodiment;

[0038] Figure 14 shows the operation of a BS according to a gNB wake-up signal according to an embodiment;

[0039] Figure 15 shows a DTx method for BS energy saving according to an embodiment;

[0040] Figure 16 is a flowchart showing the operation of a terminal for an energy-saving method according to an embodiment;

[0041] Figure 17 is a flowchart showing the operation of a BS for an energy-saving method according to an embodiment;

[0042] Figure 18 shows a terminal according to an embodiment; and

[0043] Figure 19 shows a BS according to an embodiment. Detailed Description of the Embodiments

[0044] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. When describing the embodiments of the present disclosure, descriptions related to well-known technical content in the art and not directly related to the present disclosure will be omitted. Such omission of unnecessary descriptions is intended to prevent obscuring the main idea of the present disclosure and to more clearly convey the main idea.

[0045] For similar reasons, in the drawings, some elements may be exaggerated, omitted, or schematically shown. Thus, the size of each element does not fully reflect the actual size. In the drawings, the same or corresponding elements may be provided with the same reference numerals.

[0046] By referring to the embodiments described in detail below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and the ways to achieve them will become clear. However, the present disclosure is not limited to the embodiments set forth below, but may be implemented in various different forms. The following embodiments are provided only to fully disclose the present disclosure and to inform those skilled in the art of the scope of the present disclosure, and the present disclosure is defined only by the scope of the appended claims.

[0047] Furthermore, when describing the present disclosure, when it is determined that a detailed description of a known function or configuration incorporated herein may unnecessarily obscure the subject matter of the present disclosure, the description will be omitted. The terms to be described below are terms defined in consideration of the functions in the present disclosure and may vary according to the user, the user's intention, or habit. Therefore, the definition of the terms should be based on the content of the entire specification.

[0048] In the following description, the BS is an entity that allocates resources to a terminal and can be at least one of a gNode B, an eNode B, a Node B, a radio access unit, a BS controller, and a node on the network. The terminal may include a UE, a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. In the present disclosure, DL refers to the radio link through which the BS sends signals to the terminal, and UL refers to the radio link through which the terminal sends signals to the BS.

[0049] In the following description, although the LTE or Long Term Evolution-Advanced (LTE-A) system may be described by way of example, embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. Examples of such communication systems may include 5G mobile communication technologies developed outside of LTE-A (e.g., New Radio (NR)), and in the following description, "5G" may be a concept that encompasses existing LTE, LTE-A, or other similar services. Additionally, based on the determination of those skilled in the art, embodiments of the present disclosure may also be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0050] Each block of the flowchart and combinations of blocks in the flowchart can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions executed via the processor of the computer or other programmable data processing apparatus create means for implementing the functions specified in one or more of the flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, where the computer-usable or computer-readable memory can direct the computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable memory produce an article of manufacture including instruction means for implementing the functions specified in one or more of the flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus, thereby producing a computer-implemented process, such that the instructions executed on the computer or other programmable apparatus provide steps for implementing the functions specified in one or more of the flowchart blocks.

[0051] Each block of the flowchart may represent a module, segment, or portion of code that includes one or more executable instructions for implementing the specified logical function. In some alternative embodiments, the functions noted in the blocks may occur out of the order noted. For example, two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

[0052] As used herein, a "unit" refers to a software element or a hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, the term "unit" does not always have a meaning limited to software or hardware. A "unit" may be configured to be stored in an addressable storage medium or to execute on one or more processors. Thus, a "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, programs, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" may be combined into a smaller number of elements or "units" or divided into a larger number of elements or "units". Also, the elements and "units" may be implemented to reproduce one or more central processing units (CPUs) within a device or a secure multimedia card. In addition, a "unit" in an embodiment may include one or more processors.

[0053] In the following, the methods and apparatuses proposed in the embodiments of the present disclosure provide examples for describing improving UL coverage when performing a random access procedure, but are not limited to each embodiment, and may be used for a method of configuring frequency resources corresponding to another channel by using a combination of all or some of one or more embodiments proposed in the present disclosure. Accordingly, depending on the determination made by those skilled in the art, the embodiments of the present disclosure may be applied with some modifications within a range not significantly deviating from the scope of the present disclosure.

[0054] The terms described below are terms defined in consideration of the functions in the present disclosure and may vary according to a user, the intention of the user, or a habit. Accordingly, the definitions of the terms should be based on the content of the entire specification.

[0055] Wireless communication systems are evolving towards broadband wireless communication systems for providing high-speed and high-quality packet data services using communication standards as well as typical voice-based services, such as the 3rd Generation Partnership Project (3 rdHigh-Speed Packet Access (HSPA), LTE, Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-A, LTE-Pro of the 3rd Generation Partnership Project (3GPP), High-Rate Packet Data (HRPD), Ultra-Mobile Broadband (UMB) of 3GPP2, IEEE 802.17e, etc.

[0056] As an example of a broadband wireless communication system, the LTE system adopts an OFDM scheme in the DL and a single carrier frequency division multiple access (SC-FDMA) scheme in the UL. The UL indicates the radio link through which the UE (or MS) sends data or control signals to the BS (or eNode B), and the DL indicates the radio link through which the BS sends data or control signals to the UE. The above multi-access scheme can operate to separate the data or control information of each user by allocating and operating time-frequency resources for sending data or control information for each user, so as to avoid overlapping with each other, that is, to establish orthogonality.

[0057] Since the 5G communication system, as a post-LTE communication system, should freely reflect various requirements of users, service providers, etc., it should support services that meet various requirements. The services considered in the 5G communication system include enhanced mobile broadband (eMBB) communication, massive machine type communication (mMTC), ultra-reliable low-latency communication (URLLC), etc.

[0058] eMBB aims to provide higher data rates than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, for a single BS, eMBB should provide a peak data rate of 20 Gbps in the DL and 10 Gbps in the UL. Further, the 5G communication system should provide an increased user-perceived data rate as well as a maximum data rate to the UE. To meet such requirements, transmission / reception technologies including further enhanced MIMO transmission technology need to be improved. In addition, the data rates required by the 5G communication system can be obtained by using a frequency BW of more than 20 MHz in the 3 to 6 GHz or 6 GHz or higher frequency bands, rather than using a transmission BW of up to 20 MHz in the 2 GHz band used in LTE to transmit signals.

[0059] In addition, mMTC is being considered to support application services such as IoT in the 5G communication system. mMTC has requirements such as supporting the connection of a large number of UEs in a cell, enhancing the coverage of UEs, improving battery life, and reducing the cost of UEs in order to effectively provide IoT. Since IoT provides communication functions while being provided to various sensors and various devices, it should support a large number of UEs in a cell (e.g., 1,000,000 UEs / km 2 ). In addition, UEs supporting mMTC may require a wider coverage than other services provided by the 5G communication system because UEs may be located in shadow areas not covered by the cell due to the nature of the service, such as the basement of a building. UEs supporting mMTC should also be configured to be inexpensive and have a very long battery life, such as 10 to 15 years, because it is difficult to replace the battery of the UE frequently.

[0060] Finally, URLLC, as a cellular-based mission-critical wireless communication service, can be used for remote control of robots or machines, industrial automation, driverless vehicles, telemedicine, emergency alerts, etc. URLLC should provide communication with ultra-low latency and ultra-high reliability. For example, services supporting URLLC should meet an air interface latency of less than 0.5 ms and also require a packet error rate of 10-5 or lower. Therefore, for services supporting URLLC, the 5G system should provide a shorter transmit time interval (TTI) than other services and should also allocate a large number of resources in the frequency band to ensure the reliability of the communication link.

[0061] These three services in the 5G communication system (or "5G system"), namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted in a single system. To meet the different requirements of each service, different transmission / reception technologies and transmission / reception parameters can be used between services.

[0062] In the following, for the sake of explanation, a 5G system configuration will be used as an example to describe a wireless communication system to which the present disclosure is applied. However, embodiments of the present disclosure can also be applied to a 5G or higher system or other communication systems to which the present disclosure is applicable in the same or similar manner.

[0063] Figure 1 The time-frequency domain in a wireless communication system according to an embodiment is shown.

[0064] Referring to Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time domain and the frequency domain is a resource element (RE) 101, and it can be defined as 1 OFDM symbol (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol) 102 on the time axis and 1 subcarrier 103 on the frequency axis. In the frequency domain, (e.g., 12) consecutive REs representing the number of subcarriers per resource block (RB) can constitute an RB 104. In addition, in the time domain, consecutive OFDM symbols representing the number of symbols per subframe can constitute a subframe 110.

[0065] Figure 2 The slot structure in a wireless communication system according to an embodiment is shown.

[0066] Referring to Figure 2 , an example of a slot structure including a frame 200, a subframe 201, and slots 202 or 203 is shown. A frame 200 can be defined as 10 ms. A subframe 201 can be defined as 1 ms, so a frame 200 can include a total of 10 subframes 201. A slot 202 or 203 can be defined as 14 OFDM symbols (e.g., the number of symbols per slot ). A subframe 201 can include one or more slots 202 or 203, and the number of slots 202 or 203 per subframe 201 can vary according to μ 204 and 205 (i.e., the configured value of SCS).

[0067] The slot structure for μ = 0 204 and the slot structure for μ = 1 205 are shown, where μ is the SCS configuration value. For μ = 0 204, a subframe 201 can include one slot 202, while for μ = 1 205, a subframe 201 can include two slots (e.g., including slot 203). The number of slots per subframe It can vary according to the configuration value μ of the SCS, and the number of time slots per frame can change accordingly. For example, according to each SCS configuration μ and can be defined as shown in Table 1 below.

[0068] Table 1

[0069]

[0070] In a 5G wireless communication system, the BS can send an SSB (the SSB can be used interchangeably with the SS block or the SS / PBCH block) to the terminal for the initial access of the terminal. The SSB can include a primary SS (PSS), a secondary SS (SSS), and a physical broadcast channel (PBCH).

[0071] During the initial access of the terminal to the network, the terminal can first obtain DL time-domain and frequency-domain synchronization from the SS via cell search, and can obtain the cell identifier (ID). The SS can include the PSS and the SSS. The terminal can receive the PBCH including the master information block (MIB) from the BS in order to obtain basic parameter values and system information related to transmission or reception, such as the system BW or relative control information. Based on the received information, the terminal can decode the physical DL control channel (PDCCH) and the physical DL shared channel (PDSCH) in order to obtain the SIB. The terminal can exchange terminal identity-related information with the BS via random access, and can initially access the network via registration and authentication. In addition, the terminal can receive system information (e.g., SIB) sent by the BS in order to obtain control information related to cell-common transmission or reception. The control information related to cell-common transmission or reception can include random access-related control information, paging-related control information, and common control information for various physical channels.

[0072] The SS can be a signal used as a reference for cell search, and the SCS can be applied to the SS to suit the channel environment of each frequency band, such as phase noise. For data channels or control channels, in order to support various services, the SCS can be applied differently depending on the service type.

[0073] Figure 3 Shows the beam scanning operation and time-domain mapping structure of the SS according to an embodiment.

[0074] ReferenceFigure 3 , the following elements can be defined:

[0075] - PSS: The PSS is a signal used as a reference for DL time / frequency synchronization and can provide some cell ID information.

[0076] - SSS: The SSS can be a signal used as a reference for DL time / frequency synchronization and can provide some remaining cell ID information. In addition, the SSS can be used as a reference signal (RS) for the demodulation of the PBCH.

[0077] - PBCH: The PBCH can include the MIB, where the MIB is the basic system information for the transmission or reception of the data channels and control channels of the terminal. The basic system information can include search space-related control information indicating the radio resource mapping information of the control channel, scheduling control information for the separate data channels used for system information transmission, and information such as the system frame number (SFN) (the SFN is the frame unit index used as a timing standard), etc.

[0078] SS / PBCH block or SSB (SS / PBCH block): The SS / PBCH block can be configured by N OFDM symbols and can include a combination of PSS, SSS, PBCH, etc. For a system applying beam scanning technology, the SS / PBCH block can be the smallest unit to which beam scanning is applied. In a 5G system, N can be 4 (N = 4). The BS can transmit up to L SS / PBCH blocks, and the L SS / PBCH blocks can be mapped within a half-frame (0.5 ms). The L SS / PBCH blocks can be periodically repeated in units of a predetermined period (P). The BS can notify the terminal of the period (P) via signaling. If there is no separate signaling for the period (P), the terminal can apply a pre-arranged default value.

[0079] Figure 3 An example of applying beam scanning in units of SS / PBCH blocks over time is shown. For terminal 1 305, by applying beamforming to SS / PBCH block #0 at time point t1, the SS / PBCH block can be received using the beam transmitted in direction #d0 303. By applying beamforming to SS / PBCH block #4 at time point t2, terminal 2 306 can receive the SS / PBCH block by using the beam transmitted in direction #d4 304.

[0080] The terminal can obtain the best SS via the beam transmitted from the BS in the direction where the terminal is located. For example, for terminal 1305, it may be difficult to obtain time / frequency synchronization and basic system information from the SS / PBCH block via the beam transmitted in direction #d4 away from the location of terminal 1.

[0081] In addition to the initial access procedure, in order to determine whether the radio link quality of the current cell is maintained at a specific level or higher, the terminal can also receive the SS / PBCH block. Further, during the handover procedure in which the terminal moves the access from the current cell to an adjacent cell, the terminal can determine the radio link quality of the adjacent cell and receive the SS / PBCH block of the adjacent cell in order to obtain the time / frequency synchronization of the adjacent cell.

[0082] The SS is a signal used as a reference for cell search, where an SCS suitable for the channel environment (e.g., phase noise) can be applied to each frequency band so that the SS can be transmitted. The 5G BS can transmit multiple SSBs according to the number of analog beams to be operated. For example, the PSS and SSS can be mapped and transmitted on 12 RBs, and the PBCH can be mapped and transmitted on 24 RBs.

[0083] Figure 4 An SSB in a wireless communication system according to an embodiment is shown.

[0084] Reference Figure 4 , the SSB (or SS block) 400 may include a PSS 401, an SSS 403, and a PBCH 402.

[0085] The SSB 400 can be mapped to four OFDM symbols 404 on the time axis. The PSS 401 and SSS 403 can be transmitted in 12 RBs 405 on the frequency axis and in the first and third OFDM symbols on the time axis. In the 5G system, for example, a total of 1008 different cell IDs can be defined. Depending on the physical layer cell ID of the cell (or physical cell ID (PCI)), the PSS 401 can have 3 different values, and the SSS 403 can have 336 different values. Via the detection of the PSS 401 and SSS 403, based on their combination, the terminal can obtain one of, for example, 1008 (336×3 = 1008) cell IDs as expressed in Equation (1).

[0086]

[0087] In Equation (1), can be estimated according to the SSS 403 and can have a value between 0 and 335. It can be estimated according to PSS 401 and can have a value between 0 and 2. The terminal can estimate the value of as the cell ID by using the combination of and . value.

[0088] Among the 24 RBs 406 on the frequency axis and in the 2nd to 4th OFDM symbols of the SS block on the time axis, PBCH 402 can be transmitted in the resources including 6 RBs 407 and 6 RBs 408 on both sides, excluding the middle 12 RBs 405 where SSS 403 is transmitted. PBCH 402 can include a PBCH payload and PBCH DMRS. The PBCH payload can include various system information, for example, MIB. For example, the MIB can include the information as shown in below.

[0089] Table 2

[0090]

[0091] - SSB information: The frequency-domain offset of the SSB can be indicated via 4 bits ssb-SubcarrierOffset (ssb-subcarrier offset) in the MIB. The terminal can indirectly obtain the index of the SSB including PBCH via the decoding of PBCH and PBCH DMRS. In the frequency band below 6 GHz, 3 bits obtained via the decoding of PBCH DMRS can indicate the SSB index, and in the frequency band above 6 GHz, a total of 6 bits including 3 bits obtained via the decoding of PBCH DMRS and 3 bits included in the PBCH payload and obtained from the PBCH decoding can indicate the SSB index including PBCH.

[0092] - PDCCH configuration information: Inside the MIB, 1 bit (subCarrierSpacingCommon (subcarrier spacing common)) can be used to indicate the SCS of the common DL control channel, and 8 bits (pdcch-ConfigSIB1 (pdcch-configuration IB1)) can be used to indicate the time-frequency resource configuration information of the control resource set (CORESET) and the search space.

[0093] - SFN: In the MIB, 6 bits (systemFrameNumber) can be used to indicate a part of the SFN. 4 bits of the SFN (e.g., the least significant bit (LSB)) can be included in the PBCH payload, and the terminal can indirectly obtain 4 bits of the SFN via PBCH decoding.

[0094] - Timing information in the radio frame: The timing information in the radio frame can be 1 bit (half-frame) and is included in the above-mentioned PBCH payload and SSB index for obtaining via PBCH decoding. The terminal can indirectly identify whether the SSB has been transmitted in the first half-frame or the second half-frame of the radio frame.

[0095] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters can also be included.

[0096] The transmission BW (12 RBs 405) of PSS 401 and SSS 403 is different from the transmission BW (24 RBs 406) of PBCH 402, such that within the transmission bandwidth of PBCH 402, in the first OFDM symbol on which PSS 401 is transmitted, in addition to the middle 12 RBs on which PSS 401 is transmitted, there can be 6 RBs 407 and 6 RBs 408 on both sides. The foregoing regions can be used for the transmission of another signal or can be empty.

[0097] The same analog beam can be used to transmit the SSB. For example, PSS 401, SSS 403, and PBCH 402 can all be transmitted via the same beam. Since the analog beam cannot be applied differently to the frequency axis, the same analog beam can be applied to all frequency-axis RBs within a specific OFDM symbol to which a specific analog beam has been applied. For example, the four OFDM symbols on which PSS 401, SSS 403, and PBCH 402 are transmitted can all be transmitted via the same analog beam.

[0098] Figure 5 and Figure 6 shows various cases of transmitting the SSB according to an embodiment.

[0099] Reference Figure 5, in a 5G communication system, 15 kHz SCS 520 and 30 kHz SCS 530 or 540 can be used for SSB transmission in a frequency band less than or equal to 6 GHz. For SSB in 15 kHz SCS 520, there may be one transmission case (e.g., case #1 501), while for SSB in 30 kHz SCS 530 or 540, there may be two transmission cases (e.g., case #2 502 and case #3 503).

[0100] In case #1 501 of 15 kHz SCS 520, up to 2 SSBs can be transmitted within a 1 ms time 504 (or a time corresponding to the length of one time slot when one time slot includes 14 OFDM symbols). For example, SSB#0 507 can be mapped to four consecutive symbols starting from the 3rd OFDM symbol, and SSB#1 508 can be mapped to four consecutive symbols starting from the 9th OFDM symbol.

[0101] According to an embodiment, different analog beams can be applied to SSB#0 507 and SSB#1 508.

[0102] According to another embodiment, the same beam can be applied to all of the 3rd to 6th OFDM symbols to which SSB#0 507 is mapped, and the same beam can be applied to all of the 9th to 12th OFDM symbols to which SSB#1 508 is mapped. Regarding the beam to be used for the 7th, 8th, 13th, and 14th OFDM symbols to which no SSB is mapped, the analog beam can be freely determined by the BS itself.

[0103] In case #2 502 of 30 kHz SCS 530, up to 2 SSBs can be transmitted within a 0.5 ms time 505 (or a time corresponding to the length of one time slot when one time slot includes 14 OFDM symbols), and correspondingly, up to 4 SSBs can be transmitted within a 1 ms time (or a time corresponding to the length of two time slots when one time slot includes 14 OFDM symbols). For example, in Figure 5 it shows the case of transmitting SSB#0 509, SSB#1 510, SSB#2 511, and SSB#3 512 within a 1 ms time (i.e., two time slots). SSB#0 509 and SSB#1 510 can be mapped starting from the 5th OFDM symbol and the 9th OFDM symbol of the 1st time slot respectively, and SSB#2 511 and SSB#3 512 can be mapped starting from the 3rd OFDM symbol and the 7th OFDM symbol of the 2nd time slot respectively.

[0104] According to an embodiment, different analog beams can be applied to SSB#0 509, SSB#1 510, SSB#2 511, and SSB#3 512 respectively.

[0105] According to another embodiment, the same analog beam can be applied to the 5th to 8th OFDM symbols in the 1st time slot where SSB#0 509 is transmitted, the 9th to 12th OFDM symbols in the 1st time slot where SSB#1 510 is transmitted, the 3rd to 6th symbols in the 2nd time slot where SSB#2 511 is transmitted, and the 7th to 10th symbols in the 2nd time slot where SSB#3 512 is transmitted. Regarding the beam to be used for OFDM symbols to which no SSB is mapped, the analog beam can be freely determined by the BS itself.

[0106] In case #3 503 of 30kHz SCS 540, up to 2 SSBs can be transmitted within a 0.5ms time 506 (or the time corresponding to the length of one time slot when one time slot includes 14 OFDM symbols), and correspondingly, up to 4 SSBs can be transmitted within a 1ms time (or the time corresponding to the length of two time slots when one time slot includes 14 OFDM symbols). For example, in Figure 5 it shows the transmission of SSB#0 513, SSB#1 514, SSB#2 515, and SSB#3 516 within a 1ms time (i.e., two time slots). SSB#0 513 and SSB#1 514 can start mapping from the 3rd OFDM symbol and the 9th OFDM symbol in the 1st time slot respectively, and SSB#2 515 and SSB#3 516 can start mapping from the 3rd OFDM symbol and the 9th OFDM symbol in the 2nd time slot respectively.

[0107] According to an embodiment, different analog beams can be used in SSB#0 513, SSB#1 514, SSB#2 515, and SSB#3 516 respectively.

[0108] As described above, the same analog beam can be used for all four OFDM symbols in which each SSB is transmitted. For OFDM symbols to which no SSB is mapped, the beam to be used can be freely determined by the BS itself.

[0109] Referring to Figure 6 in a 5G communication system, in a frequency band greater than or equal to 6GHz, 120kHz SCS 630 related to case #4 610 and 240kHz SCS 640 related to case #5 620 can be used for SSB transmission.

[0110] Referring to the case #4 610 of SCS 630 with 120 kHz, up to 4 SSBs can be transmitted within a 0.25 ms time 601 (or a time corresponding to the length of two time slots when one time slot includes 14 OFDM symbols). For example, in Figure 6 shows the case of transmitting SSB#0 603, SSB#1 604, SSB#2 605, and SSB#3 606 within a 0.25 ms time (i.e., two time slots). SSB#0 603 and SSB#1 604 can be respectively mapped to four consecutive symbols starting from the 5th OFDM symbol of the 1st time slot and four consecutive symbols starting from the 9th OFDM symbol of the 1st time slot, and SSB#2 605 and SSB#3 606 can be respectively mapped to four consecutive symbols starting from the 3rd OFDM symbol of the 2nd time slot and four consecutive symbols starting from the 7th OFDM symbol of the 2nd time slot.

[0111] As described above, different analog beams can be used in SSB#0 603, SSB#1 604, SSB#2 605, and SSB#3 606 respectively. Additionally, the same analog beam can be used for all four OFDM symbols in which each SSB is transmitted. For the OFDM symbols to which no SSB is mapped, the beam to be used can be freely determined by the BS itself.

[0112] Referring to the case #5 620 of SCS 640 with 240 kHz, up to 8 SSBs can be transmitted within a 0.25 ms time 602 (or a time corresponding to the length of four time slots when one time slot includes 14 OFDM symbols). For example, in Figure 6 shows the case of transmitting SSB#0 607, SSB#1 608, SSB#2 609, SSB#3 610, SSB#4 611, SSB#5 612, SSB#6 613, and SSB#7 614 within a 0.25 ms time (i.e., four time slots).

[0113] SSB#0 607 and SSB#1 608 can be respectively mapped to four consecutive symbols starting from the 9th OFDM symbol of the 1st time slot and four consecutive symbols starting from the 13th OFDM symbol of the 1st time slot. SSB#2 609 and SSB#3 610 can be respectively mapped to four consecutive symbols starting from the 3rd OFDM symbol of the 2nd time slot and four consecutive symbols starting from the 7th OFDM symbol of the 2nd time slot. SSB#4 611, SSB#5 612 and SSB#6 613 can be respectively mapped to four consecutive symbols starting from the 5th OFDM symbol of the 3rd time slot, four consecutive symbols starting from the 9th OFDM symbol of the 3rd time slot and four consecutive symbols starting from the 13th OFDM symbol of the 3rd time slot, or SSB#7 614 can be mapped to four consecutive symbols starting from the 3rd OFDM symbol of the 4th time slot.

[0114] As described above, different analog beams can be respectively applied to SSB#0 607, SSB#1 608, SSB#2 609, SSB#3 610, SSB#4 611, SSB#5 612, SSB#6 613 and SSB#7 614. In addition, the same analog beam can be used for all four OFDM symbols in which each SSB is transmitted. For OFDM symbols to which no SSB is mapped, the beam to be used can be freely determined by the BS itself.

[0115] Figure 7 It shows the situation of transmitting SSB according to SCS in a wireless communication system within 5 ms according to an embodiment.

[0116] Reference Figure 7 , in a 5G communication system, SSB can be periodically transmitted, for example, in units of a time interval of 5 ms 710 (a time interval corresponding to 5 sub - frames or a half - frame).

[0117] In a frequency band less than or equal to 3 GHz, up to 4 SSBs can be transmitted within a 5 - ms time 710. In a frequency band greater than 3 GHz and less than or equal to 6 GHz, up to 8 SSBs can be transmitted. In a frequency band greater than 6 GHz, up to 64 SSBs can be transmitted. As described above, SCSs of 15 kHz and 30 kHz can be used at frequencies less than or equal to 6 GHz.

[0118] Reference Figure 5In case #1 501 which includes one time slot of 15 kHz SCS, the SSB can be mapped to the first and second time slots to achieve the transmission of up to 4 SSBs 721 in a frequency band less than or equal to 3 GHz, and can be mapped to the first, second, third, and fourth time slots to achieve the transmission of up to 8 SSBs 722 in a frequency band greater than 3 GHz and less than or equal to 6 GHz.

[0119] Regarding Figure 5 In case #2 502 or case #3 503 which includes two time slots of 30 kHz SCS, the SSB can be mapped starting from the first time slot to achieve the transmission of up to 4 SSBs 731 and 741 in a frequency band less than or equal to 3 GHz, and can be mapped starting from the first and third time slots to achieve the transmission of up to 8 SSBs 732 and 742 in a frequency band greater than 3 GHz and less than or equal to 6 GHz.

[0120] 120 kHz and 240 kHz SCS can be used at frequencies greater than 6 GHz.

[0121] Regarding case #4 610 which includes two time slots of 120 kHz SCS, the SSB can be mapped starting from the first, third, fifth, seventh, eleventh, thirteenth, fifteenth, seventeenth, twenty - first, twenty - third, twenty - fifth, twenty - seventh, thirty - first, thirty - third, thirty - fifth, and thirty - seventh time slots to achieve the transmission of up to 64 SSBs in a frequency band greater than 6 GHz.

[0122] Regarding case #5 620 which includes four time slots of 240 kHz SCS, the SSB can be mapped starting from the first, fifth, ninth, thirteenth, twenty - first, twenty - fifth, twenty - ninth, and thirty - third time slots to achieve the transmission of up to 64 SSBs 761 in a frequency band greater than 6 GHz.

[0123] The terminal can decode the PDCCH and PDSCH based on the system information included in the received MIB, and then obtain the SIB. The SIB can include at least one of UL cell BW - related information, random access parameters, paging parameters, or UL power control - related parameters.

[0124] Generally, based on the system information obtained during the cell search procedure and synchronization with the network, the terminal can establish a radio link to the network via random access. Either a contention-based or contention-free scheme can be used for random access. A contention-based random access scheme can be used when the terminal performs cell selection and reselection during the initial access to a cell (e.g., to move from the RRC_IDLE (RRC idle) state to the RRC_CONNECTED (RRC connected) state). A contention-free random access can be used to re-establish UL synchronization in the case of DL data arrival, handover, or position measurement.

[0125] Table 3 below shows the conditions (events) for triggering random access in the 5G system.

[0126] Table 3

[0127]

[0128] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0129] Hereinafter, a description will be provided of a method for configuring the measurement time for radio resource management (RRM) of SSB (SS block or SSB) based on a 5G wireless communication system.

[0130] The terminal can configure MeasObjectNR (measurement object NR) of MeasObjectToAddModList (measurement object addition / modification list) for intra-frequency / inter-frequency measurement based on SSB and intra-frequency / inter-frequency measurement based on CSI-RS via higher layer signaling. For example, MeasObjectNR can be configured as shown in Table 4 below.

[0131] Table 4

[0132]

[0133] -ssbFrequency (ssb frequency): The frequency of the SS associated with MeasObjectNR can be configured.

[0134] -ssbSubcarrierSpacing (ssb subcarrier spacing): The SCS of the SSB can be configured. For frequency range 1 (FR1), only 15 kHz or 30 kHz may be applied, and for frequency range 2 (FR2), only 120 kHz or 240 kHz may be applied.

[0135] -smtc1: It can indicate the SS / PBCH block measurement timing configuration (SMTC), configure the primary measurement timing configuration, and configure the timing offset and duration for the SSB.

[0136] -smtc2: It can configure the secondary measurement timing configuration for the SSB related to the MeasObjectNR with the PCI listed in the pci-List.

[0137] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0138] In addition, the foregoing parameters can be configured via other higher-layer signaling. For example, for a terminal, at least one SMTC can be configured for the NR primary secondary cell (PSCell) change and the NR primary cell (PCell) change via reconfigurationWithSync (synchronous reconfiguration), or for intra-frequency, inter-frequency, and inter-RAT cell reselection via SIB2. In addition, in order to add an NR secondary cell (SCell), the SMTC can be configured for the terminal via SCellConfig.

[0139] For SSB measurement, based on smtc1 configured via higher-layer signaling, the terminal can configure the first SMTC according to the periodictiyAndOffset (period and offset) (which provides the period and offset). In an embodiment, the first subframe of each SMTC occasion can start from the SFN and subframe of a special cell (SpCell) that meets the conditions in Table 5 below.

[0140] Table 5

[0141]

[0142] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0143] According to an embodiment, when smtc2 is configured, for a cell indicated by the pci-List value of smtc2 in the same MeasObjectNR, the terminal can configure additional SMTC according to the period of the configured smtc2 and the offset and duration of smtc1. For the same frequency (e.g., the frequency for intra-frequency cell reselection) or different frequencies (e.g., the frequency for inter-frequency cell reselection), the terminal can be configured with smtc and measure SSB based on the smtc3list related to smtc2-LP (with a long period) and integrated access and backhaul-mobile termination (IAB-MT). The terminal may not consider the SSB transmitted in subframes other than the SMTC occasion for SSB-based RRM measurement in the configured ssbFrequency.

[0144] The BS can use various transmit / receive point (TRP) operation schemes depending on the serving cell configuration and PCI configuration.

[0145] When two TRPs at physically separated locations have different PCIs, there may be two methods for operating these two TRPs among the multi-TRP operation schemes.

[0146] [Operation Method 1]

[0147] Two TRPs with different PCIs can operate using two serving cell configurations.

[0148] The BS can add channels and signals transmitted in different TRPs to different serving cell configurations to configure them via [Operation Method 1]. For example, each TRP can have an independent serving cell configuration, and the band value of FrequencyInfoDL (downlink frequency information) indicated by DownlinkConfigCommon in each serving cell configuration can indicate at least some overlapping bands. Since multiple TRPs operate based on multiple ServCellIndex (serving cell index) values (e.g., ServCellIndex#1 and ServCellIndex#2), each TRP can use a separate PCI. For example, the BS can assign one PCI to each ServCellIndex.

[0149] In the above case, when multiple SSBs are transmitted in TRP 1 and TRP 2, these SSBs may have different PCIs (e.g., PCI#1 and PCI#2), and the BS can appropriately select the ServCellIndex value indicated by the cell parameters in the quasi-colocation (QCL) information to map the PCI suitable for each TRP, and can designate the SSB transmitted in one of TRP 1 and TRP 2 as the source reference RS of the QCL configuration information. However, since the foregoing configuration applies a serving cell configuration that can be used for carrier aggregation (CA) of a terminal to multiple TRPs, there may be problems of increased signaling overhead or limited degrees of freedom in the CA configuration.

[0150] [Operation Method 2]

[0151] Two TRPs with different PCIs can operate using one serving cell configuration.

[0152] Via [Operation Method 2], the BS can configure the channels and signals transmitted in different TRPs via one serving cell configuration. Since the terminal operates based on one ServCellIndex (e.g., ServCellIndex#1), the PCI assigned to the second TRP (e.g., PCI#2) may not be recognized. When compared with the above [Operation Method 1], [Operation Method 2] may have a higher degree of freedom in the CA configuration, but when multiple SSBs are transmitted in TRP 1 and TRP 2, these SSBs may have different PCIs (e.g., PCI#1 and PCI#2), and it may not be possible for the BS to map the PCI of the second TRP (e.g., PCI#2) via the ServCellIndex indicated by the cell parameters in the QCL-Info. The BS may be able to designate only the SSB transmitted in TRP1 as the source RS of the QCL configuration information, and may not be able to designate the SSB transmitted in TRP 2.

[0153] As described above, [Operation Method 1] can perform multi-TRP operation on two TRPs with different PCIs via an additional serving cell configuration without additional standard support, but [Operation Method 2] can operate based on the following additional UE capability report and BS configuration information.

[0154] Related to the UE capability report for [Operation Method 2]

[0155] The terminal can report via UE capabilities to the BS that it is possible to configure additional PCIs other than the PCI of the serving cell via high-layer signaling from the BS. The UE capabilities can include two independent quantities X1 and X2, or each of X1 and X2 can be reported via independent UE capabilities.

[0156] X1 can refer to the maximum number of additional PCIs that can be configured for the terminal. The PCI can be different from the PCI of the serving cell. In such a case, the time-domain positioning and period of the SSB corresponding to the additional PCI can be the same as those of the SSB of the serving cell.

[0157] X2 can refer to the maximum number of additional PCIs that can be configured for the terminal. In such a case, the PCI can be different from the PCI of the serving cell, where the time-domain positioning and period of the SSB corresponding to the additional PCI can be different from those of the SSB corresponding to the PCI reported using X1.

[0158] Due to the above definitions, the PCIs corresponding to the values reported using X1 and X2 may not be configured simultaneously.

[0159] Each of the values reported via UE capability reporting (the values reported using X1 and X2) can have an integer value from 0 to 7.

[0160] For the values reported using X1 and X2, different values can be reported in FR1 and FR2.

[0161] Related to the high-layer signaling for [Operation Method 2]

[0162] Based on the above UE capability reporting, the terminal can be configured with the high-layer signaling SSB-MTCAdditionalPCI-r17 from the BS. This high-layer signaling can at least include multiple additional PCIs with values different from those of the serving cell, the SSB transmission power corresponding to each additional PCI, and the ssb-PositionInBurst (position in the ssb-burst) corresponding to each additional PCI, and the maximum number of additional PCIs that can be configured can be 7.

[0163] As an assumption regarding the SSB corresponding to the additional PCI with a value different from that of the serving cell, the terminal can assume that the center frequency, SCS, or subframe number offset of the SSB is the same as that of the SSB of the serving cell.

[0164] The terminal may assume that a reference RS (e.g., SSB or CSI-RS) corresponding to the PCI of the serving cell is always connected to an active transmission configuration indicator (TCI) state. For an additionally configured PCI having a value different from that of the serving cell, if there is one or more PCIs, the terminal may assume that only one of the PCIs is connected to the active TCI state.

[0165] If the terminal is configured with two different coresetPoolIndex (coreset pool index) values, the reference RS corresponding to the serving cell PCI is connected to one or more active TCI states, and the reference RS corresponding to an additionally configured PCI having a value different from that of the serving cell is connected to one or more active TCI states, then the terminal may expect that the active TCI state connected to the PCI of the serving cell is connected to one of the two coresetPoolIndex, or the active TCI state connected to the additionally configured PCI having a value different from that of the serving cell is connected to the remaining one coresetPoolIndex.

[0166] Based on the higher layer signaling of the BS and the UE capability report of the above [Operation Method 2], additional PCIs having values different from the PCI value of the serving cell may be configured. If there is no configuration, an SSB that cannot be designated as a source RS and corresponds to an additional PCI having a value different from the PCI value of the serving cell may be used to designate it as the source RS of the QCL configuration information. It may also be used as a QCL source RS to support the operation of multiple TRPs with different PCIs, which is different from the SSB that can be configured for purposes such as RRM, mobility, or handover, similar to the configuration information about the SSB that can be configured in smtc1 and smtc2 of the higher layer signaling.

[0167] The DMRS may include multiple DMRS ports, and each port may maintain orthogonality by using code division multiplexing (CDM) or frequency division multiplexing (FDM) to prevent interference with each other. However, depending on the user's intention and the purpose of using the RS, the term DMRS may be expressed in other terms that are substantially similar or equivalent. The term DMRS provides specific examples only to easily explain the technical content of the present disclosure and help understand the present disclosure, and is not intended to limit the scope of the present disclosure. In other words, it is clear to those skilled in the art to which the present disclosure pertains that the present disclosure may be implemented for any RS based on the technical idea of the present disclosure.

[0168] Figure 8 Illustrates DMRS patterns (type 1 and type 2) for communication between a BS and a terminal according to an embodiment.

[0169] Refer to Figure 8 , patterns 801 and 802 correspond to DMRS type 1, where pattern 801 represents a 1-symbol pattern and pattern 802 represents a 2-symbol pattern. The DMRS type 1 of patterns 801 and 802 is a DMRS pattern with a comb 2 structure and may include two CDM groups, and different CDM groups can perform FDM.

[0170] In the 1-symbol pattern 801, CDM in the frequency domain is applied to the same CDM group, so that two DMRS ports can be distinguished, and thus a total of four orthogonal DMRS ports can be configured. The 1-symbol pattern 801 may include DMRS port IDs mapped to each CDM group (for example, the DMRS port ID for DL can be indicated by the shown number +1000).

[0171] In the 2-symbol pattern 802, CDM in the time / frequency domain is applied to the same CDM group, so that four DMRS ports can be distinguished, and thus a total of eight orthogonal DMRS ports can be configured. The 2-symbol pattern 802 may include DMRS port IDs mapped to each CDM group (for example, the DMRS port ID for DL can be indicated by the shown number +1000).

[0172] The DMRS type 2 shown in patterns 803 and 804 is a DMRS pattern with a structure in which a frequency-domain orthogonal cover code (FD-OCC) is applied to subcarriers adjacent in the frequency domain, and may include three CDM groups, and different CDM groups can perform FDM.

[0173] In the 1-symbol pattern 803, CDM in the frequency domain is applied to the same CDM group, so that two DMRS ports can be distinguished, and thus a total of six orthogonal DMRS ports can be configured. The 1-symbol pattern 803 may include DMRS port IDs mapped to each CDM group (for example, the DMRS port ID for DL can be indicated by the shown number +1000). In the 2-symbol pattern 804, CDM in the time / frequency domain is applied to the same CDM group, so that four DMRS ports can be distinguished, and thus a total of 12 orthogonal DMRS ports can be configured. The 2-symbol pattern 804 may include DMRS port IDs mapped to each CDM group (for example, the DMRS port ID for DL can be indicated by the shown number +1000).

[0174] As described above, in the NR system, two different DMRS patterns can be configured (e.g., DMRS pattern 801 and 802 or DMRS pattern 803 and 804), and each DMRS pattern can also be configured as either a 1-symbol pattern 801 or 803 or an adjacent 2-symbol pattern 802 or 804. In addition, in the NR system, not only can the DMRS port number be scheduled, but the number of CDM groups scheduled together for PDSCH rate matching can also be configured and signaled. Furthermore, for cyclicprefix-based OFDM (CP-OFDM), both of the above two DMRS patterns can be supported in both DL and UL, while for DFT-S-OFDM, only DMRS type 1 among the aforementioned DMRS patterns can be supported in UL.

[0175] According to an embodiment, additional DMRS can be supported as configurable. The preamble DMRS may refer to the first DMRS transmitted or received in the symbol that is the earliest in the time domain among the DMRSs, and the additional DMRS may refer to the DMRS transmitted or received in the symbol after the preamble DMRS in the time domain. In the NR system, the number of additional DMRSs can be configured from a minimum of 0 to a maximum of 3. In addition, when additional DMRSs are configured, the same pattern as the preamble DMRS can be assumed. When information about whether the DMRS pattern type described for the preamble DMRS is type 1 or type 2, information about whether the DMRS pattern is a 1-symbol pattern or an adjacent 2-symbol pattern, and information about the DMRS port and the number of CDM groups used is indicated, in the case where additional DMRSs are additionally configured, the additional DMRSs can be assumed to be configured with the same DMRS information as the preamble DMRS.

[0176] The above DL DMRS configuration can be configured via RRC signaling as shown in Table 6 below.

[0177] Table 6

[0178]

[0179] In Table 6, dmrs-Type can configure the DMRS type, dmrs-AdditionalPosition can configure additional DMRS OFDM symbols, maxLength can configure 1-symbol DMRS pattern or 2-symbol DMRS pattern, scramblingID0 and scramblingID1 can configure the scrambling ID, and phaseTrackingRS can configure the phase tracking RS (PTRS).

[0180] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0181] In addition, the above UL DMRS configuration can be configured via RRC signaling as shown in Table 7 below.

[0182] Table 7

[0183]

[0184] In Table 7, dmrs-Type can configure the DMRS type, dmrs-AdditionalPosition can configure additional DMRS OFDM symbols, phaseTrackingRS can configure PTRS, and maxLength can configure 1-symbol DMRS pattern or 2-symbol DMRS pattern. scramblingID0 and scramblingID1 can configure the scrambling ID0, nPUSCH-Identity can configure the cell ID for DFT-s-OFDM, sequenceGroupHopping can disable sequence group hopping, and sequenceHopping can enable sequence hopping.

[0185] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0186] Figure 9 Shows channel estimation using DMRS received from PUSCH according to an embodiment.

[0187] Reference Figure 9When performing channel estimation for data decoding using DMRS, the channel estimation can be performed within a precoding RB group (PRG) in a bundling unit by using a physical RB (PRB) bundling linked to a system band in a frequency band. In addition, channel estimation can be performed by assuming that only the DMRS received on one PUSCH in a time unit has the same precoding.

[0188] Hereinafter, a time domain resource allocation (TDRA) method for a data channel in a 5G communication system will be described. The BS can configure a TDRA information table for a DL data channel (e.g., PDSCH) and a UL data channel (e.g., PUSCH) for a terminal via higher layer signaling (e.g., RRC signaling).

[0189] The BS can configure a table including up to 17 entries (maxNrofDL-Allocations = 17) for the PDSCH and can configure a table including up to 17 entries (maxNrofUL-Allocations = 17) for the PUSCH. The TDRA information can include at least one of, for example, the following: PDCCH to PDSCH slot timing (denoted as K0 and corresponding to the time interval in slots between the time point of receiving the PDCCH and the time point of transmitting the PDSCH scheduled by the received PDCCH) or PDCCH to PUSCH slot timing (denoted as K2 and corresponding to the time interval in slots between the time point of receiving the PDCCH and the time point of transmitting the PUSCH scheduled by the received PDCCH), information on the positioning and length of the starting symbol scheduled for the PDSCH or PUSCH within a slot, and the mapping type of the PDSCH or PUSCH.

[0190] The TDRA information for the PDSCH can be configured for the terminal via RRC signaling as shown in Table 8 below.

[0191] Table 8

[0192]

[0193] In Table 8, k0 represents the timing of PDCCH to PDSCH in terms of time slots (e.g., the time slot offset between DCI and the scheduled PDSCH), mappingType (mapping type) can represent the PDSCH mapping type, startSymbolAndLength (start symbol and length) can represent the start symbol and length of the PDSCH, and repetitionNumber (number of repetitions) can represent the number of PDSCH transmission opportunities according to the time slot-based repetition scheme.

[0194] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0195] The TDRA information for PUSCH can be configured for the terminal via RRC signaling as shown in Table 9 below.

[0196] Table 9

[0197]

[0198] In Table 9, k2 represents the timing of PDCCH to PUSCH in terms of time slots (e.g., the time slot offset between DCI and the scheduled PUSCH), mappingType can represent the PUSCH mapping type, startSymbolAndLength, StartSymbol (start symbol) or length (length) can represent information about the start symbol or length of the PUSCH, and numberOfRepetitions (number of repetitions) can represent the number of repetitions applied to PUSCH transmission.

[0199] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0200] The BS can indicate at least one entry in the TDRA information table to the terminal via L1 signaling (e.g., DCI) (e.g., the indication can be made via "TDRA" in the DCI). The terminal can obtain the TDRA information of the PDSCH or PUSCH based on the DCI received from the BS.

[0201] In the following, the transmission of the UL data channel (e.g., PUSCH) in a 5G system will be described. The PUSCH transmission can be dynamically scheduled by a UL grant in DCI (e.g., dynamic grant (DG)-PUSCH), or can be scheduled by configured grant (CG) type 1 or CG type 2 (e.g., CG-PUSCH). The dynamic scheduling for the PUSCH transmission can be indicated by, for example, DCI format 0_0 or 0_1.

[0202] The PUSCH transmission of CG type 1 can be semi-statically configured via higher layer signaling based on the configuredGrantConfig including rrc-ConfiguredUplinkGrant in Table 10 without receiving a UL grant in DCI. After receiving a configuredGrantConfig that does not include rrc-ConfiguredUplinkGrant in Table 10 via higher layer signaling, the PUSCH transmission of CG type 2 can be semi-persistently scheduled based on a UL grant in DCI.

[0203] When the PUSCH transmission is scheduled by CG, the parameters applied to the PUSCH transmission can be configured based on the higher layer signaling configuredGrantConfig in Table 10, excluding the specific parameters provided via the higher layer signaling pusch-Config in Table 11 (e.g., dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, or scaling of UCI-OnPUSCH). For example, if the terminal obtains transformPrecoder in the higher layer signaling configuredGrantConfig in Table 10, the terminal can apply tp-pi2BPSK in the pusch-Config of Table 11 to the PUSCH transmission operated by CG.

[0204] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters can also be included.

[0205] Table 10

[0206]

[0207] The DMRS antenna port for PUSCH transmission can be the same as the antenna port for sounding reference signal (SRS) transmission. PUSCH transmission can comply with each of the codebook-based transmission method and the non-codebook-based transmission method, depending on whether the txConfig value in the higher layer signaling pusch-Config in Table 7 corresponds to "codebook" or "nonCodebook". As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1 and can be semi-statically configured by the CG.

[0208] If the scheduling for PUSCH transmission is indicated to the terminal via DCI format 0_0, the terminal can perform beam configuration for PUSCH transmission by using the pucch-spatialRelationInfoID corresponding to the UE-specific (dedicated) PUCCH resource with the lowest ID having an active UL BWP in the serving cell.

[0209] PUSCH transmission can be performed based on a single antenna port. Within a BWP where no PUCCH resource including pucch-spatialRelationInfo is configured, the terminal may not expect scheduling for PUSCH transmission via DCI format 0_0. If the terminal does not configure the txConfig in the pusch-Config in Table 11, the terminal may not expect to be scheduled via DCI format 0_1.

[0210] Table 11

[0211]

[0212] Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1 and can be semi-statically operated by the CG. If codebook-based PUSCH transmission is dynamically scheduled by DCI format 0_1 or semi-statically configured by the CG, the terminal can determine the precoder for PUSCH transmission based on the SRS resource indicator (SRI), the transmission precoding matrix indicator (TPMI), and the transmission rank (e.g., the number of PUSCH transmission layers).

[0213] The SRI can be given via the SRI field in the DCI, or can be configured via the higher layer signaling srs-ResourceIndicator. At least one SRS resource can be configured for the terminal during codebook-based PUSCH transmission. For example, up to two SRS resources can be configured. When the SRI is provided to the terminal via the DCI, the SRS resource indicated by the SRI can refer to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the SRI. In addition, the TPMI and the transmission rank can be given via the fields, precoding information, and number of layers in the DCI, or can be configured via the higher layer signaling precodingAndNumberOfLayers. The TPMI can be used to indicate the precoder applied to the PUSCH transmission.

[0214] The precoder to be used for PUSCH transmission can be selected from the UL codebook having the same number of antenna ports as the nrofSRS-Ports value in the higher layer signaling SRS-Config. In codebook-based PUSCH transmission, the terminal can determine the codebook subset based on the codebookSubset in the higher layer signaling pusch-Config and the TPMI. Based on the UE capabilities reported by the terminal to the BS, the codebookSubset (codebook subset) in the higher layer signaling pusch-Config can be configured as one of "fullyAndPartialAndNonCoherent", "partialAndNonCoherent", or "nonCoherent".

[0215] If the terminal has reported "partialAndNonCoherent" based on the UE capabilities, the terminal may not expect the value of the higher layer signaling codebookSubset to be configured as "fullyAndPartialAndNonCoherent". In addition, if the terminal has reported "nonCoherent" based on the UE capabilities, the terminal may not expect the value of the higher layer signaling codebookSubset to be configured as "fullyAndPartialAndNonCoherent" or "partialAndNonCoherent". If the nrofSRS-Ports in the higher layer signaling SRS-ResourceSet indicates two SRS antenna ports, the terminal may not expect the value of the higher layer signaling codebookSubset to be configured as "partialAndNonCoherent".

[0216] The terminal can be configured with an SRS resource set, where the usage value in the higher layer signaling SRS-ResourceSet is configured as "codebook", and one SRS resource in the corresponding SRS resource set can be indicated via SRI. If multiple SRS resources are configured in the SRS resource set where the usage value in the higher layer signaling SRS-ResourceSet is configured as "codebook", the terminal can expect that the nrofSRS-Ports value in the higher layer signaling SRS-Resource is configured to be the same for all SRS resources.

[0217] The terminal can send to the BS one or more SRS resources included in the SRS resource set where the usage value is configured as "codebook" according to the higher layer signaling. The BS can select one of the SRS resources sent by the terminal and can indicate to the terminal to perform PUSCH transmission by using the transmission beam information of the SRS resource. In the codebook-based PUSCH transmission, the SRI can be used as the information of the index for selecting an SRS resource and can be included in the DCI. In addition, the BS can add the information indicating the rank and TPMI to be used by the terminal for PUSCH transmission to the DCI for sending it. The terminal can, by using the SRS resource indicated by the SRI, apply the precoder indicated by the TPMI and rank indicated by the transmission beam based on the SRS resource and perform PUSCH transmission.

[0218] The non-codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1 and can be semi-statically operated by the CG. If at least one SRS resource is configured in the SRS resource set where the usage value in the higher layer signaling SRS-ResourceSet is configured as "nonCodebook", the terminal can be scheduled for non-codebook-based PUSCH transmission via DCI format 0_1.

[0219] For an SRS resource set where the usage value in the higher layer signaling SRS-ResourceSet is configured to "nonCodebook", the terminal may be configured with non-zero power (NZP) CSI-RS resources associated with an SRS resource set. The terminal can perform the calculation of the precoder for SRS transmission via the measurement of the NZP CSI-RS resources configured in association with the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resources associated with the SRS resource set in the terminal and the first symbol of the aperiodic SRS transmission is less than a specific number of symbols (e.g., 42 symbols), the terminal may not expect to update the information about the precoder for SRS transmission.

[0220] If the resourceType value in the higher layer signaling SRS-ResourceSet is configured to "aperiodic", the NZP CSI-RS associated with the SRS-ResourceSet can be indicated by the SRS request in the fields of DCI format 0_1 or 1_1.

[0221] The case where the NZP CSI-RS resources associated with the SRS-ResourceSet are aperiodic NZP CSI resources and the value of the SRS request in the fields of DCI format 0_1 or 1_1 is not "00" can indicate the existence of the NZP CSI-RS resources associated with the SRS-ResourceSet. The DCI may neither indicate cross-carrier scheduling nor cross-BWP scheduling. If the value of the SRS request indicates the existence of the NZP CSI-RS, the NZP CSI-RS can be located in the time slot through which the PDCCH including the SRS request field is transmitted. The TCI state configured in the scheduled subcarriers may not be configured as QCL-TypeD.

[0222] If a periodic or semi-persistent SRS resource set is configured, the NZP CSI-RS associated with the SRS resource set can be indicated via associatedCSI-RS in the higher layer signaling SRS-ResourceSet. For non-codebook based transmission, the terminal may not expect the higher layer signaling spatialRelationInfo in the SRS resources and associatedCSI-RS in the higher layer signaling SRS-ResourceSet to be configured together.

[0223] If multiple SRS resources are configured, the terminal can determine the transmission rank and precoder to be applied to PUSCH transmission based on the SRI indicated by the BS. The SRI can be indicated via the field SRI in the DCI, or can be configured via the higher layer signaling srs-ResourceIndicator. Similar to the aforementioned codebook-based PUSCH transmission, when the SRI is provided to the terminal via the DCI, the SRS resource indicated by the SRI can refer to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the SRI. The terminal can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within an SRS resource set can be determined by the UE capability reported by the terminal to the BS. The SRS resources simultaneously transmitted by the terminal occupy the same RB. The terminal can configure one SRS port for each SRS resource. It is possible to configure only one SRS resource set in which the usage value in the higher layer signaling SRS-ResourceSet is configured as "nonCodebook", and the configuration of up to 4 SRS resources for non-codebook-based PUSCH transmission is possible.

[0224] The BS can send one NZP CSI-RS associated with the SRS resource set to the terminal. When receiving the NZP CSI-RS, the terminal can calculate the precoder to be used when one or more SRS resources in the SRS resource set are transmitted based on the measurement results. When sending one or more SRS resources in the SRS resource set in which the usage is configured as "nonCodebook" to the BS, the terminal can apply the calculated precoder. The BS can select one or more SRS resources from among the received one or more SRS resources.

[0225] In non-codebook-based PUSCH transmission, the SRI can include an index that can represent one or a combination of multiple SRS resources, and the SRI can be included in the DCI. The number of SRS resources indicated by the SRI sent by the BS can be the number of PUSCH transmission layers, and the terminal can send the PUSCH by applying the precoder applied to the SRS resource transmission to each layer.

[0226] In a 5G system, two types of repeated UL data channel transmission methods (e.g., repeated PUSCH transmission type A and repeated PUSCH transmission type B) and TB processing over multi-slot PUSCH (TBoMS) for sending a single transport block (TB) via multi-PUSCH transmissions within multiple time slots can be supported. In addition, the terminal can be configured with one of repeated PUSCH transmission type A or B via higher layer signaling. In addition, the terminal can be configured with "numberOfSlotsTBoMS" via a resource allocation table to send TBoMS.

[0227] Repeated PUSCH transmission type A

[0228] As described above, within one time slot, the start symbol and length of the UL data channel are determined by the TDRA method, and the BS can send the number of repeated transmissions to the terminal via higher layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). The number of time slots N configured via numberOfSlotsTBoMS to determine the TB size (TBS) can be 1.

[0229] Based on the number of repeated transmissions received from the BS, the terminal can repeatedly send a UL data channel with the same start symbol and length as the configured UL data channel in consecutive time slots. If at least one symbol among the symbols in the time slot configured as DL for the terminal or in the time slots configured for the terminal for repeated UL data channel transmission is configured for DL, the terminal can skip the UL data channel transmission in the corresponding time slot. For example, the terminal may not send the UL data channel within the number of repeated UL data channel transmissions. However, a terminal supporting Rel-17 repeated UL data transmission can determine that the time slots available for repeated UL data transmission are available time slots, and can count the number of transmissions during the repeated UL data channel transmission in the time slots determined to be available time slots. If the repeated UL data channel transmission in the time slot determined to be an available time slot is skipped, the terminal can perform the repeated transmission via the time slots available for transmission after postponement. By using Table 12 below, the redundancy version can be applied according to the redundancy version pattern configured for each nth PUSCH transmission occasion.

[0230] Repeated PUSCH transmission type B

[0231] As described above, within a time slot, the start symbol and length of the UL data channel can be determined by the TDRA method. The BS can send the number of repetition transmissions, numberOfRepetitions, to the terminal via higher layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). The number of time slots N configured to determine the TBS via numberOfSlotsTBoMS can be 1.

[0232] Based on the configured start symbol and length of the UL data channel, the nominal repetition of the UL data channel can be determined as follows. Here, the nominal repetition can indicate the resources of the symbols configured by the BS for repeated PUSCH transmissions, and the terminal can determine the resources available for UL in the configured nominal repetition. In such a case, the time slot at which the nth nominal repetition starts can be given by and the symbol at which the nominal repetition starts in the starting time slot can be given by The time slot at which the nth nominal repetition ends can be given by and the symbol at which the nominal repetition ends in the last time slot can be given by Here, n = 0, …, numberOfRepetitions, S can represent the configured start symbol of the UL data channel, and L can represent the symbol length of the configured UL data channel. K s can represent the time slot at which the PUSCH transmission starts, and can represent the number of symbols per time slot.

[0233] The terminal can determine the invalid symbols for repeating PUSCH transmission type B. The symbols configured for DL by tdd-UL-DL-ConfigurationCommon (TDD UL-DL configuration common) or tdd-UL-DL-ConfigurationDedicated (TDD UL-DL configuration dedicated) can be determined as the invalid symbols for repeating PUSCH transmission type B. Additionally, the invalid symbols can be configured based on higher layer parameters (e.g., InvalidSymbolPattern (invalid symbol pattern)). For example, the higher layer parameter (e.g., InvalidSymbolPattern) can provide a symbol-level bitmap within one time slot or within two time slots, such that the invalid symbols can be configured. An indication of 1 in the bitmap can represent an invalid symbol. Furthermore, the period and pattern of the bitmap can be configured via a higher layer parameter (e.g., periodicityAndPattern (period and pattern)). If the higher layer parameter (e.g., InvalidSymbolPattern) is configured, and the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_2 indicates 1, the terminal can apply the invalid symbol pattern, while if this parameter indicates 0, the terminal may not apply the invalid symbol pattern. Alternatively, if the higher layer parameter (e.g., InvalidSymbolPattern) is configured, and the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_2 is not configured, the terminal can apply the invalid symbol pattern.

[0234] After determining the invalid symbols in each nominal repetition, the terminal can consider the symbols other than the determined invalid symbols as valid symbols. If each nominal repetition includes one or more valid symbols, the nominal repetition can include one or more actual repetitions. Here, each actual repetition can indicate the symbols that are configured to be actually used for repeating PUSCH transmission among the symbols of the configured nominal repetition, and can include a set of consecutive valid symbols within one time slot that are available for repeating PUSCH transmission type B. If an actual repetition with one symbol is configured as valid, the terminal can skip the actual repetition transmission, unless the symbol length of the configured UL data channel is 1 (L = 1). By using Table 12 below, the redundancy version can be applied according to the redundancy version pattern configured for each nth actual repetition.

[0235] TBoMS

[0236] As described above, within one time slot, the starting symbol and length of the UL data channel can be determined by the TDRA method. The BS can send the number of repeat transmissions to the terminal via higher layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). The TBS can be determined using an N value greater than or equal to 1, where the N value is the number of time slots configured via numberOfSlotsTBoMS.

[0237] Based on the number of repeat transmissions and the number of time slots used to determine the TBS received from the BS, the terminal can send UL data channels with the same starting symbol and length as the configured UL data channel in consecutive time slots. If at least one symbol among the symbols in the time slot configured by the BS as DL for the terminal or in the time slot configured for the terminal for repeat UL data channel transmission is configured as DL, the terminal can skip the UL data channel transmission in the corresponding time slot. For example, even if the UL data channel is included in the number of repeat transmissions, the terminal may not send it.

[0238] On the other hand, a terminal supporting Rel-17 repeat UL data transmission can determine that the time slots capable of performing repeat UL data transmission are available time slots, and can count the number of transmissions during the repeat UL data channel transmission in the time slots determined to be available time slots. If the repeat UL data channel transmission in the time slot determined to be an available time slot is skipped, the terminal can perform the repeat transmission via the available time slots after postponement.

[0239] As shown in Table 12 below, the redundancy version can be applied according to the redundancy version pattern configured for each nth PUSCH transmission occasion.

[0240] Table 12

[0241]

[0242] If AvailableSlotCounting is configured to be enabled for the terminal, the terminal can determine the available time slots for type A repeat PUSCH transmission and repeat TBoMS PUSCH transmission based on the tdd-UL-DL-ConfigurationCommon, tdd-UL-DL-ConfigurationDedicated, ssb-PositionsInBurst, and TDRA information field values. For example, if in the time slot for PUSCH transmission, at least one symbol configured via the TDRA for PUSCH overlaps with at least one symbol with a purpose other than UL transmission, that time slot can be determined to be an unavailable time slot.

[0243] Figure 10 shows a method for reconfiguring SSB transmission via dynamic signaling according to an embodiment. More specifically, Figure 10 shows method 1001 for reconfiguring SSB transmission via bitmap-based group / cell common DCI.

[0244] Referring Figure 10 , the terminal can be configured by the BS via higher layer signaling (SIB1 or ServingCellConfigCommon) with ssb-PositionsInBurst = "11110000" 1002. Up to two SSBs with a 30 kHz SCS can be transmitted within 0.5 ms (or the time corresponding to the length of one time slot when one time slot includes 14 OFDM symbols), and correspondingly, the terminal can receive four SSBs within 1 ms (or the time corresponding to the length of two time slots when one time slot includes 14 OFDM symbols). In such a case, in order to reduce energy, the BS can reduce the density of SSB transmission. The BS can reconfigure the SSB transmission configuration information by broadcasting the bitmap "1010xxxx" 1004 via group / cell common DCI 1003 with a network energy saving-radio network temporary identifier (nwes-RNTI) (or es-RNTI). In such a case, the transmission of SS block #1 1005 and SS block #3 1006 can be cancelled based on the bitmap 1004 configured via group / cell common DCI.

[0245] According to an embodiment, the BS can reconfigure ssb-periodicity configured via higher layer signaling based on group / cell common DCI. In addition, timer information for indicating the time point at which the group / cell common DCI is applied can be configured additionally. The BS can transmit the SSB based on the SSB transmission information reconfigured via group / cell common DCI during the configured timer. When the timer expires, the BS can operate based on the SSB transmission information configured via the existing higher layer signaling. The BS can change the configuration from the normal mode to the energy saving mode via the timer and can reconfigure the resulting SSB configuration information.

[0246] The BS can configure the application time point and period of the SSB configuration information reconfigured via group / cell common DCI as offset and duration information for the terminal. In such a case, the terminal may not monitor the SSB during the duration starting from the moment when the group / cell common DCI is received and the offset is applied.

[0247] Figure 11 Shows a method for reconfiguring BW and BWP via dynamic signaling according to an embodiment.

[0248] Refer to Figure 11 , in reference numeral 1101, the terminal can operate based on the BWP (or BW) activated via higher layer signaling and L1 signaling from the BS. For example, the terminal can operate with a fixed power PSD B (Power Spectral Density) via a full BW of 100 MHz. In such a case, for energy saving, in reference numeral 1102, the BS can adjust the BW and BWP to activate a narrower BW of 40 MHz for a terminal with the same power PSD B .

[0249] In reference numeral 1103, the adjustment of the BW or BWP by the BS for energy saving can be configured to equivalently match the UE-specific configured BWP and BW via group common DCI and cell-specific DCI. For example, UE#0 and UE#1 can have different BWP configurations and positions. In such a case, in order for the BS to save energy by reducing the BW used, the BW and BWP of all terminals can be equivalently configured to 1.

[0250] One or more BWP or BW can be configured in the operation for energy saving, which can be used to configure UE group-specific BWP.

[0251] Figure 12 Shows a method for reconfiguring DRX via dynamic signaling according to an embodiment.

[0252] Refer to Figure 12 , the BS can configure DRX specific to the UE via higher layer signaling. For example, the BS can configure different drx-LongCycle, drx-ShortCycle, drx-onDurationTimer, and drx-InactivityTimer for each terminal. For energy saving, in reference numeral 1201, the BS can configure the UE-specific DRX configuration to be UE group-specific or cell-specific via L1 signaling. Accordingly, the BS can achieve the same energy saving effect as the terminal saving power via DRX.

[0253] Figure 13 Shows an antenna adaptation method of the BS for energy saving according to an embodiment.

[0254] Refer to Figure 13, for energy saving, the BS can adjust the Tx antenna ports on a per-resource unit basis. Since the power amplifier (PA) of the BS accounts for most of the energy consumption of the BS, in reference numeral 1301, the BS can turn off the Tx antenna for energy saving. In such a case, to determine whether the Tx antenna can be turned off, the BS can adjust the number of active Tx antennas for each UE group or UE by considering at least one of the terminal's RS received power (RSRP), channel quality information (CQI), or RS received quality (RSRQ), etc. The BS can send Tx based on the adjusted number of Tx antennas. In such a case, the BS can configure beam information, RS information, etc. via DCI signaling according to the on / off state of the terminal's antenna. In addition, the BS can configure different antenna information for each BWP to reconfigure the antenna information according to the BWP change.

[0255] Figure 14 Shows the operation of the BS according to the gNB wake-up signal according to an embodiment.

[0256] Reference Figure 14 , for energy saving, the BS can maintain the transmitter in an off (or inactive) state during the BS sleep mode. The BS can receive the gNB wake-up signal 1402 from the terminal to activate the sleep mode of the BS. When the BS receives a wake-up signal (WUS) from the terminal via the receiver, the Tx end can be changed to an on (or active) state 1403. The BS can perform DL transmission to the terminal. In such a case, the BS can continue to synchronize after the Tx is turned on and send control and data signals. In addition, the gNB WUS can include various UL signals (e.g., physical random access channel (PRACH), scheduling request (SR) PUCCH, PUCCH including acknowledgment (ACK), etc.).

[0257] According to the above method, the BS can save energy, and the terminal can improve the latency at the same time.

[0258] In addition, Figures 10 to 14 The method shown is not limited to the disclosed content and can be configured simultaneously by at least one combination thereof.

[0259] According to embodiments of the present disclosure, a DTx method for reducing the power consumption of a BS is described, and a DTx activation / deactivation configuration method and a DTx configuration method via high-layer signaling and dynamic L1 signaling are described. In addition, a synchronization method for performing DTx is described.

[0260] Figure 15 A DTx method for BS energy saving according to an embodiment is shown.

[0261] Referring to Figure 15 , for energy saving, the BS can configure DTx via high-layer signaling (e.g., a new SIB or RRC signaling for DTx) and L1 signaling (e.g., DCI). The BS can configure the dtx-onDurationTimer 1505 for transmitting RSs for measuring path loss, beam management, RRM measurements, etc., or for scheduling the PDCCH for the DL shared channel (SCH) for DTx operation. The BS can configure the SS1503 configuration information for synchronization for the terminal before the dtx-onDurationTimer and the dtx-InactivityTimer 1506 to receive the PDSCH after receiving the PDCCH for scheduling the DL SCH. The BS can configure the dtx-offset 1504 for configuring the offset between the dtx-onDurationTimers after the SS, and the dtx-(Long)Cycle1502 of DTx to operate periodically based on the above configuration information.

[0262] Multiple dtx-cycle values can be configured to include a long cycle or a short cycle. When DTx is being performed, the BS can configure the transmitter to be off (or inactive), so that the DL common channel (CCH), SCH, and DL RSs may not be transmitted. For example, when DTx is being performed, the BS can transmit DL signals (PDCCH, PDSCH, RS, etc.) only in the sections indicated by the SS, the dtx-onDurationTimer, and the dtx-InactivityTimer. As additional information about the configured SS, the SS-gapbetweenBurst or the number of SS bursts can be configured additionally.

[0263] More specifically, according to the terminal state (RRC connected, RRC idle, or RRC inactive), the configuration information can be configured by one of them or a combination thereof.

[0264] For energy saving, the BS can configure the configuration information about DTx operation for the terminal in the RRC connected state.

[0265] The BS can configure DTx configuration information for the terminal via RRC signaling. For example, the following dtx-config can be configured via RRC signaling.

[0266] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0267] Table 13

[0268]

[0269] The BS can configure the configuration information for DTx operation and the RS configuration information for synchronization before DTx via the DTx-Config RRC configuration.

[0270] For energy saving, the BS can configure the configuration information regarding DTx operation for all terminals in the RRC connected state and the RRC idle / inactive state.

[0271] Using the new SIB, the BS can configure the DTx operation configuration information for terminals in the RRC connected state, the RRC idle state, and the RRC inactive state, as well as all terminals newly accessing the cell. For example, the terminal can configure DTx from the BS via SIBXX as follows.

[0272] The foregoing parameters are merely examples and are not limited thereto. Of course, equivalent or substantially similar parameters may also be included.

[0273] Table 14

[0274]

[0275] The SIB (i.e., SIBXX) can be broadcast from the BS for terminal configuration, and the terminal attempting initial access can receive the SIBXX sent during the DTx period to determine whether DTx operates and execute the access procedure. Regarding whether the SIBXX is updated, it can be indicated to the terminal via a paging message whether the SIB information has changed. Additionally, if for BS energy saving, the DTx configuration information can be configured and changed via cell-specific or UE group-specific DCI (e.g., DCI scrambled with NWES-RNTI plus cyclic redundancy check (CRC)), parameters including some or all of the above may be included.

[0276] The terminal can be configured with configuration information for DTx operation from the BS. In addition, the configured DTx configuration value can be sent or received via the PUSCH / PUCCH of the terminal connected via RRC or UE assistance information. Based on the RS for synchronization before DTx operation, the CCH and SCH sent during DTx operation can be QCL. In addition, the configuration of the SS before DTx operation can be included in MeasConfig for configuration.

[0277] The terminal can be configured with DTx configuration information from the BS via high-layer signaling (e.g., RRC or SIB). Depending on the state, the terminal can be instructed to activate / deactivate DTx operation via one or a combination of various methods of the present disclosure.

[0278] The terminal can be instructed to activate DTx operation from the BS via cell-specific DCI or UE group-specific DCI with a new RNTI (e.g., NWES-RNTI). The DCI received by the terminal from the BS can include information about the cell to enable simultaneous indication of one or more cells for a CA-capable terminal. The terminal can monitor the DCI received from the BS via a type 3-PDCCH common search space (CSS) set, which is configured via the SearchSpace in PDCCH-Config with searchSpaceType = Common. When the SS is configured by the SSB, the terminal can receive the DCI via Coreset0. When the terminal is instructed to activate and deactivate DTx, the terminal can apply the DTx operation after the processing time from the last symbol of the received DCI.

[0279] The terminal can be configured to activate and deactivate DTx operation based on a MAC CE received from the BS with a new extended logical channel ID (eLCID). The MAC CE can include cell information and RSID information of the SS for synchronization before DTx. For example, the MAC CE can have the following structure, and the size of the MAC CE can vary depending on the number of cell information items.

[0280] Table 15

[0281]

[0282] As shown in Table 15, the MAC CE structure received by the terminal may include seven pieces of cell information (C1 to C7) and the RS ID information (R) of the SS in each active cell. The MAC CE may include information indicating the activation and deactivation of the DTx operation in one octet. When 32 cells are supported, it can be extended to four octets. For octet 2 to octet N, the RS ID of the SS of DTx in the active cell can be configured. Using the MAC CE, the terminal can be configured with SS information and whether DTx is activated. The terminal may perform the DTx operation after receiving the MAC CE, after the processing time, and / or after transmitting the PUCCH including the ACK / NACK signal.

[0283] Based on the DCI with a new RNTI or the DCI with a P-RNTI, the terminal may be instructed to activate the DTx operation. The terminal may monitor the DCI via a new RNTI from the BS (e.g., NWES-RNTI). Alternatively, the terminal may monitor the DCI via a type 2-PDCCH CSS, which is configured via the pagingSearchSpace in the PDCCH-ConfigCommon for DCI format 1_0 with a P-RNTI. When the SS is configured by the SSB, the terminal may receive the DCI via Coreset0. The DCI received by the terminal may include information about the cell to enable simultaneous indication of one or more cells for the terminal supporting CA. When the terminal is instructed to activate and deactivate DTx, the terminal may apply the DTx operation after the processing time from the last symbol of the received DCI.

[0284] The BS may indicate the activation and deactivation of the DTx operation via the above method, and the terminal may apply DTx via the DCI or MAC CE configuration of the above method. In addition, the DTx operation may always be performed via RRC configuration, or may always be performed by configuring the DTx operation for each BWP. When the terminal is configured to perform the DTx operation regardless of whether the DTx operation is activated, the BS may recognize this and may not receive the indication information related to the activation or deactivation of the DTx operation. Based on this, both the BS and the terminal can achieve energy saving.

[0285] Figure 16 is a flowchart showing the operation of a terminal for an energy-saving method according to an embodiment. Specifically, Figure 16 shows the execution of the above Figures 1 to 15 operations described in.

[0286] Refer to Figure 16, in step 1601, the terminal receives configuration information for DTx operation from the BS via high-layer signaling (e.g., RRC or SIB), e.g., as Figure 15 shown.

[0287] In step 1602, based on the DTx configuration information, the terminal can be configured whether to activate the DTx operation from the BS via DCI or MAC CE signaling. The terminal can receive information for activation or deactivation of DTx from the BS, as Figure 15 shown. Since the terminal can always perform the DTx operation via the RRC configuration received from the BS, or always perform the DTx operation by the same configuration for each BWP, step 1602 can be optional.

[0288] In step 1603, the terminal performs the DTx operation after synchronization.

[0289] The DRx operation performed by the terminal can be executed via at least one or a combination of at least one of the methods referred to above Figures 10 to 14 described.

[0290] Figure 17 is a flowchart showing the operation of the BS for an energy-saving method according to an embodiment. Specifically, Figure 17 shows the BS performing the operations referred to Figures 1 to 15 described.

[0291] Referring to Figure 17 , in step 1701, the BS sends configuration information for DTx operation to the terminal via high-layer signaling (e.g., RRC or SIB), e.g., as Figure 15 shown.

[0292] In step 1702, based on the DTx configuration information, the BS configures whether to activate the DTx operation for the terminal via DCI or MAC CE signaling. Since the terminal can always perform the DTx operation via the RRC configuration received from the BS, or always perform the DTx operation by the same configuration for each BWP, step 1702 can be optional.

[0293] In step 1703, the BS performs the DTx operation after synchronization.

[0294] The DRx operation performed by the BS can be executed via at least one or a combination of at least one of the methods referred to above Figures 10 to 14 described.

[0295] Figure 18 shows a terminal according to an embodiment.

[0296] Referring to Figure 18, the terminal 1800 includes a transceiver 1801, a controller (e.g., a processor) 1802, and a storage unit (e.g., a memory) 1803. The transceiver 1801, the controller 802, and the storage unit 1803 of the terminal 1800 may operate according to at least one method or combination of methods corresponding to the foregoing embodiments. However, the elements of the terminal 1800 are not limited to the described examples. For example, the terminal 1800 may include more or fewer elements than the foregoing elements. In addition, the transceiver 1801, the controller 1802, and the storage unit 1803 may be implemented in the form of a single chip.

[0297] The transceiver 1801 may include a transmitter and a receiver. The transceiver 1801 may send a signal to the BS or receive a signal from the BS. The signal sent to or received from the terminal may include control information and data. The transceiver 1801 may include an RF transmitter configured to perform upconversion and amplification on the frequency of the transmitted signal, and an RF receiver configured to perform low-noise amplification on the received signal and perform downconversion on the frequency. The transceiver 1801 may receive a signal through a radio channel, output the signal to the controller 1802, and send the signal output from the controller 1802 through the radio channel.

[0298] The controller 1802 may control a series of programs in which the terminal 1800 may operate according to the foregoing embodiments of the present disclosure. For example, the controller 1802 may execute or control the terminal operation to perform at least one method or combination of methods according to the embodiments of the present disclosure. The controller 1802 may include at least one processor. For example, the controller 1802 may include a communication processor configured to control communication and an application processor (AP) configured to control a higher layer (e.g., an application).

[0299] The storage unit 1803 may store control information (e.g., information about channel estimation using DMRS transmitted on the PUSCH included in the signal acquired by the terminal 1800) or data, and may have an area for storing data required for the control of the controller 1802 and data generated during the control in the controller 1802.

[0300] Figure 19 A BS according to an embodiment is shown.

[0301] Reference Figure 19, BS1900 includes a transceiver 1901, a controller (e.g., a processor) 1902, and a storage unit (e.g., a memory) 1903. The transceiver 1901, the controller 802, and the storage unit 1903 of BS1900 may operate according to at least one method or combination of methods corresponding to the foregoing embodiments. However, the elements of BS1900 are not limited to the described examples. For example, BS1900 may include more or fewer elements than the foregoing elements. In addition, the transceiver 1901, the controller 1902, and the storage unit 1903 may be implemented in the form of a single chip.

[0302] The transceiver 1901 may include a transmitter and a receiver according to an embodiment. The transceiver 1901 may send a signal to a terminal or receive a signal from a terminal. The signal sent to or received from the BS may include control information and data. The transceiver 1901 may include an RF transmitter configured to amplify and up-convert the frequency of a transmitted signal, and an RF receiver configured to perform low-noise amplification on a received signal and down-convert the frequency. The transceiver 1901 may receive a signal through a radio channel, output the signal to the controller 1902, and send the signal output from the controller 1902 through the radio channel.

[0303] The controller 1902 may control a series of programs such that BS1900 may operate according to the foregoing embodiments of the present disclosure. For example, the controller 1902 may execute or control BS operations to perform at least one method or combination of methods according to the embodiments of the present disclosure. The controller 1902 may include at least one processor. For example, the controller 1902 may include a communication processor configured to control communication and an AP configured to control a higher layer (e.g., an application).

[0304] The storage unit 1903 may store control information (e.g., information about channel estimation generated using DMRS transmitted on a PUSCH determined by the terminal 1900) or its data, as well as control information or data received from the terminal, and may have an area for storing data required for control by the controller 1902 and data generated during control in the controller 1902.

[0305] The methods according to various embodiments described in the claims or the specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0306] When these methods are implemented by software, a computer-readable storage medium for storing one or more programs (software modules) can be provided. One or more programs stored in the computer-readable storage medium can be configured to be executed by one or more processors within an electronic device. At least one program can include instructions that cause the electronic device to perform the methods according to various embodiments of the present disclosure as defined in the appended claims and / or disclosed herein.

[0307] The programs (software modules or software) can be stored in non-volatile memories, including random access memory and flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disk storage devices, compact disc-ROM (CD-ROM), digital versatile disc (DVD), or other types of optical storage devices, or cassette tapes. Alternatively, any combination or all of some of them can form the memory in which the programs are stored. In addition, multiple such memories can be included in the electronic device.

[0308] In addition, the programs can be stored in attachable storage devices, where the attachable storage devices can access the electronic device through communication networks such as the Internet, intranet, local area network (LAN), wide area network (WLAN), and storage area network (SAN), or combinations thereof. Such storage devices can access the electronic device via an external port. In addition, a separate storage device on the communication network can access the portable electronic device.

[0309] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in singular or plural according to the presented detailed embodiments. However, for ease of description, the singular or plural form is appropriately selected for the presented situation, and the present disclosure is not limited to the elements expressed in singular or plural. Therefore, elements expressed in plural can also include a single element, or elements expressed in singular can also include multiple elements.

[0310] According to the above embodiments of the present disclosure, a method is provided by defining a signal transmission method of a BS in a wireless communication system, and this method can solve the problem of excessive energy consumption and achieve high energy efficiency.

[0311] Another method is disclosed, which can solve the problem of excessive energy consumption and achieve high energy efficiency by defining the states for energy saving of the BS and the DTx configuration method in a wireless communication system.

[0312] Although specific embodiments have been described in the detailed description of the present disclosure, it is clear that various modifications and changes can be made without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be defined as limited to these embodiments, but should be defined by the appended claims and their equivalents.

Claims

1. A base station in a wireless communication system, the base station comprising: A transceiver; And A controller, coupled to the transceiver and configured to: Send first information to a user equipment (UE) via radio resource control (RRC) signaling, the first information configuring discontinuous transmission (DTX) for energy saving of the base station, Send downlink control information (DCI) indicating activation or deactivation of DTX to the UE, and Send a downlink signal to the UE based on activation or deactivation of DTX.

2. The base station according to claim 1, Among them, The first information includes second information configuring a timer for the DTX on duration for DTX and third information configuring a period for DTX.

3. The base station according to claim 1, Among them, The DCI is group common DCI, and Wherein, the DCI is sent based on a type 3 common search space.

4. The base station according to claim 1, Among them, The downlink signal is sent after a specific period from the transmission of the DCI.

5. A user equipment (UE) in a wireless communication system, the UE comprising: A transceiver; And A controller, coupled to the transceiver and configured to: Receive first information from a base station via radio resource control (RRC) signaling, the first information configuring discontinuous transmission (DTX) for energy saving of the base station, Receive downlink control information (DCI) indicating activation or deactivation of DTX from the base station, and Receive a downlink signal from the base station according to activation or deactivation of DTX.

6. The UE according to claim 5, Among them, The first information includes second information configuring a timer for the DTX on duration for DTX and third information configuring a period for DTX.

7. The UE according to claim 5, Among them, The DCI is group common DCI, and Wherein, the DCI is received based on a type 3 common search space.

8. The UE according to claim 5, Among them, The downlink signal is received after a specific period from the reception of the DCI.

9. A method performed by a base station in a wireless communication system, the method comprising: Send first information to a user equipment (UE) via radio resource control (RRC) signaling, the first information configuring discontinuous transmission (DTX) for energy saving of the base station; Send downlink control information (DCI) indicating activation or deactivation of DTX to the UE; and Send a downlink signal to the UE based on activation or deactivation of DTX.

10. The method according to claim 9, Among them, The first information includes second information configuring a timer for the DTX on duration for DTX and third information configuring a period for DTX.

11. The method according to claim 9, Among them, The DCI is group common DCI, and Wherein, the DCI is sent based on a type 3 common search space.

12. The method according to claim 9, Among them, The downlink signal is sent after a specific period from the transmission of the DCI.

13. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: Receive first information from a base station via radio resource control (RRC) signaling, the first information configuring discontinuous transmission (DTX) for energy saving of the base station; Receive downlink control information (DCI) from the base station indicating activation or deactivation of DTX; and Receive a downlink signal from the base station according to the activation or deactivation of DTX.

14. The method according to claim 13, Among them, The first information includes second information configuring a timer for a DTX on duration for DTX and third information configuring a period for DTX.

15. The method according to claim 13, Among them, The DCI is group common DCI, and wherein, the DCI is received based on a type 3 common search space.

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