CSI and radio link monitoring based on reference signal adaptation

Abstract

The present disclosure relates to a 5G or 6G communication system supporting a higher data transmission rate. A method of a user equipment (UE) is provided. The method includes receiving first information related to reception of a reference signal (RS). The RS comprises a channel state information RS (CSI-RS) or a synchronization signal. The RS is associated with a beam failure (BF) detection, a radio link failure (RLF) detection, or a CSI report. The method also includes receiving second information related to a hypothetical adaptation of a transmission power of the RS, and receiving the RS based on the first information. The method further includes determining a report amount indicating a hypothetical channel condition based on the second information and the reception of the RS, and transmitting a channel carrying the report amount indicating the hypothetical channel condition.

Description

Technical Field

[0001] The present disclosure generally relates to wireless communication systems, and more particularly, to enhanced CSI and wireless link monitoring based on reference signal adaptation. Background Art

[0002] With the technological activities carried out by the industrial and academic communities worldwide for various candidate technologies, fifth-generation (5G) or new radio (NR) mobile communications have recently received increasing attention. These candidate enabling technologies for 5G / NR mobile communications include: massive antenna technology from traditional cellular bands to high-frequency bands to provide beamforming gain and support increased capacity; new waveforms (e.g., new radio access technologies (RATs)) that can flexibly adapt to different requirements; new multiple access schemes that support massive connections, etc.

[0003] 5G mobile communication technology defines a wide frequency band to achieve high transmission rates and new services, which can be deployed not only in "sub-6 GHz" bands such as 3.5 GHz, but also in millimeter-wave bands of "above 6 GHz" including 28 GHz and 39 GHz. In addition, to achieve a transmission rate 50 times faster than 5G and an ultra-low latency as low as one-tenth of it, 6G mobile communication technology (referred to as the super 5G system) is considering deployment in the terahertz band (e.g., 95 GHz to 3 THz band).

[0004] In the initial stage of the development of 5G mobile communication technology, to support services and meet the relevant performance requirements of enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC), standardization work has been continuously carried out for the following technologies: beamforming and massive MIMO technologies for reducing radio wave path loss in millimeter waves and increasing radio wave propagation distance; parameter set (such as multi-subcarrier spacing operation) support technologies for efficient utilization of millimeter-wave resources and dynamic operation of time slot formats; initial access technologies that support multi-beam transmission and broadband; the definition and operation of BWP (bandwidth part); new channel coding methods such as LDPC (low-density parity-check) codes for high-capacity data transmission and polarization codes for high-reliable control information transmission; L2 preprocessing; and network slicing technology for providing dedicated networks for specific services.

[0005] Currently, discussions on the improvement and performance enhancement of the initial 5G mobile communication technology are underway for the services that 5G mobile communication technology needs to support. Standardization work has been carried out in the physical layer for technologies such as V2X (Vehicle-to-Everything) technology that uses the position and status information sent by vehicles to assist autonomous driving in making decisions and improve user convenience; NR-U (Unauthorized New Radio) technology that aims to make system operations comply with various regulatory requirements in the unlicensed frequency band; NR UE energy-saving technology; non-terrestrial network (NTN) (UE communicates directly with satellites) for providing coverage in areas where communication with the terrestrial network is not possible; and positioning technology.

[0006] In addition, in the air interface architecture / protocol field, standardization continues for the following technologies: industrial Internet of Things (IIoT) technology that supports new services through interoperability and integration with other industries; IAB (Integrated Access and Backhaul) technology that provides nodes for network service area expansion by supporting the integration of wireless backhaul links and access links; mobility enhancement technologies including conditional handover and DAPS (Dual-Activation Protocol Stack) handover; and two-step random access (2-step RACH of NR) technology for simplifying the random access process. Standardization work is also ongoing in the system architecture / service field, involving technologies such as the 5G baseline architecture that combines network function virtualization (NFV) and software-defined network (SDN) technologies (e.g., service-based architecture or service-based interface), and mobile edge computing (MEC) technology for receiving services based on the UE location.

[0007] With the commercialization of 5G mobile communication systems, exponentially growing connected devices will access the communication network. Therefore, it is necessary to enhance the functions and performance of 5G systems and achieve the integrated operation of connected devices. To this end, the following new research is planned: XR (Extended Reality) technology for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality), etc.; using artificial intelligence (AI) and machine learning (ML) to improve 5G performance and reduce complexity; AI service support; metaverse service support; and drone communication.

[0008] In addition, the development of 5G systems will not only lay the foundation for the development of the following technologies: new waveforms for providing coverage in the terahertz band of 6G mobile communication technology; multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas; metamaterial-based lenses and antennas for improving terahertz signal coverage; high-dimensional spatial multiplexing technology using OAM (orbital angular momentum); RIS (reconfigurable intelligent surface); but also lay the foundation for the development of the following technologies: full-duplex technology for enhancing 6G frequency efficiency and system network; AI-based communication technology that utilizes satellites and AI for system optimization from the design stage and incorporates end-to-end AI support functions; and next-generation distributed computing technology that utilizes ultra-high-performance communication and computing resources to achieve complex services beyond the capabilities of UEs. Summary of the Invention

[0009] Technical Problem

[0010] The objective of the present application is to solve at least one defect in the prior art.

[0011] Hypothetical adaptation of reference signal transmission is required to improve the detection of beam failure or radio link failure.

[0012] Technical Solution

[0013] The present disclosure relates to enhanced CSI and radio link monitoring based on reference signal adaptation.

[0014] In an embodiment, a method for a user equipment (UE) is provided. The method includes: receiving first information related to the reception of a reference signal (RS). The RS includes a channel state information RS (CSI-RS) or a synchronization signal. The RS is associated with beam failure (BF) detection, radio link failure (RLF) detection, or CSI reporting. The method further includes: receiving second information related to the hypothetical adaptation of the transmission power of the RS and the RS based on the first information. The method further includes: determining a reported quantity indicating hypothetical channel conditions based on the second information and the reception of the RS, and transmitting a channel carrying the reported quantity indicating the hypothetical channel conditions.

[0015] In another embodiment, a UE is provided. The UE includes: a transceiver configured to receive first information related to reception of an RS. The RS includes a CSI-RS or a synchronization signal. The RS is associated with BF detection, RLF detection, or CSI reporting. The transceiver is further configured to receive second information related to a hypothetical adaptation of the transmission power of the RS and the RS based on the first information. The UE further includes a processor operatively coupled to the transceiver, configured to determine a reporting amount indicating hypothetical channel conditions based on the second information and the reception of the RS. The transceiver is further configured to transmit a channel carrying the reporting amount indicating the hypothetical channel conditions.

[0016] In yet another embodiment, a base station (BS) is provided. The BS includes: a processor; and a transceiver operatively coupled to the processor. The transceiver is configured to transmit first information related to reception of an RS. The RS includes a CSI-RS or a synchronization signal. The RS is associated with BF detection, RLF detection, or CSI reporting. The transceiver is further configured to transmit second information related to a hypothetical adaptation of the transmission power of the RS, transmit the RS based on the first information, and receive a channel carrying a reporting amount indicating hypothetical channel conditions. The reporting amount is based on the second information and the RS.

[0017] Other technical features will be apparent to those skilled in the art from the following drawings, description, and claims.

[0018] Advantages of the Invention

[0019] Embodiments of the present disclosure provide a method and apparatus for adopting a hypothetical adaptation of reference signal transmission. Thus, hypothetical channel conditions can be reported to the base station, and the base station can more efficiently detect beam failure or radio link failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more fully understand the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: Figure 1 An exemplary wireless network according to an embodiment of the present disclosure is shown; Figure 2 An exemplary base station according to an embodiment of the present disclosure is shown; Figure 3 An exemplary user equipment (UE) according to an embodiment of the present disclosure is shown; Figure 4A -B shows an exemplary wireless transmit and receive path according to an embodiment of the present disclosure; Figure 5 A block diagram of an exemplary transmitter structure using OFDM according to an embodiment of the present disclosure is shown; Figure 6 A block diagram showing an exemplary receiver structure using OFDM according to an embodiment of the present disclosure; Figure 7 A block diagram showing an exemplary encoding process of a DCI format according to an embodiment of the present disclosure; Figure 8 A block diagram showing an exemplary decoding process of a DCI format for a UE according to an embodiment of the present disclosure; Figure 9 A block diagram showing an exemplary antenna block or array for forming a beam according to an embodiment of the present disclosure; Figure 10 A block diagram showing discontinuous transmission (DTX) and cell discontinuous reception (DRX) according to an embodiment of the present disclosure; Figure 11 A schematic diagram showing spatial element adaptation in a sub-array partitioning model and a fully connected model according to an embodiment of the present disclosure; Figure 12 A block diagram showing an example method of configuring one or more network operation states using high-layer signaling and triggering network state transition using downlink control information (DCI) indicating a network operation state index according to an embodiment of the present disclosure; Figure 13 A schematic diagram showing antenna port adaptation according to an embodiment of the present disclosure; Figure 14 A schematic diagram showing using DCI to trigger antenna port adaptation in a codebook configuration for CSI reporting according to an embodiment of the present disclosure; Figure 15 A block diagram showing antenna panel adaptation according to an embodiment of the present disclosure; Figure 16 A flowchart showing a method for a UE to report CSI using CSI-RS transmission power variation according to an embodiment of the present disclosure; Figure 17 A schematic diagram showing an exemplary configuration of time-domain channel measurement limitations according to an embodiment of the present disclosure; Figure 18 A flowchart showing a method for a UE to report a hypothesized beam failure and / or a hypothesized radio link failure report according to an embodiment of the present disclosure; and Figure 19 A schematic diagram showing an example of cell / beam coverage reduction due to transmission power adjustment according to an embodiment of the present disclosure. Detailed Description

[0021] Before proceeding with the following detailed description, it may be beneficial to set forth definitions of certain words and phrases used throughout this patent document. The term "coupled" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact. The terms "send," "receive," and "communicate" and their derivatives include both direct and indirect communication. The terms "include" and "comprise" and their derivatives mean including but not limited to. The term "or" is inclusive, i.e., "and / or." The phrase "associated with" and its derivatives mean including, being included within, interconnected with, containing, being contained within, connected to or coupled with, capable of communicating with, cooperating with, interlacing with, juxtaposed with, adjacent to, bound to or related to, having, having the attribute of, having a relationship with, etc. The term "controller" refers to any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and / or firmware. The functions associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase "at least one" when used with a list of items means that different combinations of one or more of the listed items may be used and only one item in the list may be required. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A, B, and C.

[0022] In addition, the various functions described below may be implemented or supported by one or more computer programs, each formed of computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, related data, or a part thereof suitable for implementation in computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any medium that can be accessed by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, compact disc (CD), digital video disc (DVD), or any other type of memory. A "non-transitory" computer-readable medium does not include wired, wireless, optical, or other communication links that transmit transient electrical signals or other signals. Non-transitory computer-readable media include media in which data can be permanently stored and media in which data can be stored and then rewritten, such as rewritable compact discs or erasable storage devices.

[0023] Definitions of other specific words and phrases are provided in this patent document. One of ordinary skill in the art should understand that in many, if not most, instances, such definitions apply to the prior and future use of the defined words and phrases.

[0024] Figures 1 to 19Also, the various embodiments used in this patent document to describe the principles of the present disclosure are merely examples and should not be construed in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0025] The following documents and standards are incorporated herein by reference as if set forth in their entirety herein: 3GPP TS 38.211 v17.2.0, "NR; Physical Channels and Modulation" (REF1); 3GPP TS 38.212 v17.2.0, "NR; Multiplexing and Channel Coding" (REF2); 3GPP TS 38.213 v17.2.0, "NR; Physical Layer Procedures for Control" (REF3); 3GPP TS 38.214 v17.2.0, "NR; Physical Layer Procedures for Data" (REF4); 3GPP TS 38.215 v17.1.0, "NR; Physical Layer Measurements" (REF5); 3GPP TS 38.331 v17.1.0, "NR; Radio Resource Control (RRC) Protocol Specification" (REF6); 3GPP TS 38.321 v17.1.0, "NR; Media Access Control (MAC) Protocol Specification" (REF7); and 3GPP TS 38.133 v17.6.0, "NR; Requirements for Supporting Radio Resource Management" (REF8).

[0026] To meet the growing demand for wireless data traffic since the deployment of 4G communication systems and support various vertical applications, 5G / NR communication systems have been developed and are being deployed. The 5G / NR communication system is considered to be implemented in higher frequency (millimeter wave) bands (e.g., 28 GHz or 60 GHz bands) to achieve higher data rates, or in lower frequency bands (e.g., 6 GHz) to achieve robust coverage and mobility support. To reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, massive antenna technology, etc. have been discussed in 5G / NR communication systems.

[0027] In addition, in 5G / NR communication systems, the development of system network improvements is underway based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), receiver interference cancellation, etc.

[0028] The discussion of 5G systems and their related frequency bands is for reference only, as some embodiments of the present disclosure can be implemented in 5G systems. However, the present disclosure is not limited to 5G systems or their related frequency bands, and the embodiments of the present disclosure can be used in combination with any frequency band. For example, aspects of the present disclosure can also be applied to 5G communication systems that may use the terahertz (THz) band, 6G, or even later versions of the deployment.

[0029] The present disclosure generally relates to wireless communication systems, and more particularly to network energy saving solutions. Network energy saving is very important for environmental sustainability, reducing environmental impact (greenhouse gas emissions), and saving operating costs. It is predicted that by 2030, the ICT industry may account for 20% of the global energy consumption. Therefore, communication networks must pay attention to global priorities related to climate change, especially reducing the energy use of the ICT industry. In addition, energy consumption has become a key part of the operator's OPEX. According to the GSMA report, the energy cost of mobile networks accounts for about 23% of the total cost of operators. Most of the energy consumption comes from the radio access network, especially the active antenna unit (AAU), and the data center and optical fiber transmission account for a smaller share. The power consumption of the radio access network can be divided into two parts: the dynamic part consumed only when data is being sent / received, and the static part that is always consumed to maintain the necessary operations of the radio access device even when data is not being sent / received.

[0030] With the popularization of 5G in various industries and geographical regions, there is a need to handle more advanced services and applications that require very high data rates (such as XR). The network is more dense and the network uses more antennas, larger bandwidths, and more frequency bands. For example, network densification increases the number of transmission points, higher carrier frequencies tend to use more antennas, and for higher spectral bands (such as millimeter wave and sub-THz / THz spectra), the operating frequency naturally tends to a wider bandwidth, which results in worse damage characteristics of RF electronic devices, while the sampling rate of digital processing and data converters is higher. High clock rates require the power consumption to increase approximately linearly. This trend will continue in 6G. Therefore, the environmental impact of 5G and future 6G needs to be controlled, and new solutions need to be developed to improve network energy saving. The present disclosure recognizes that these solutions can achieve more efficient operations dynamically and / or semi-statically, and allow for more refined adaptation of transmission and / or reception in one or more network energy saving technologies in the time, frequency, space, and power domains, and can utilize the support / feedback of the UE, potential UE-assisted information, and information exchange / coordination on the network interface.

[0031] Wireless communication is one of the most successful innovations in modern history. Recently, the number of users of wireless communication services has exceeded 5 billion and continues to grow rapidly. Due to the increasing popularity of smartphones and other mobile data devices (such as tablets, "notepad" computers, netbooks, e-book readers, and machine-type devices) among consumers and enterprises, the demand for wireless data traffic is increasing rapidly. To meet the high growth of mobile data traffic and support new applications and deployments, improvements in wireless interface efficiency and coverage are crucial.

[0032] The following Figures 1 - 3 describes various embodiments implemented in a wireless communication system and uses orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication techniques. Figures 1 - 3 The description is not intended to imply physical or architectural limitations on how different embodiments can be implemented. Different embodiments of the present disclosure can be implemented in any appropriately arranged communication system.

[0033] Figure 1 illustrates an exemplary wireless network according to an embodiment of the present disclosure. Figure 1 The illustrated embodiment of the wireless network is for illustrative purposes only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.

[0034] As Figure 1 shown, the wireless network includes gNB 101 (e.g., base station, BS), gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130 (e.g., the Internet, a proprietary Internet protocol (IP) network, or other data network).

[0035] gNB 102 provides wireless broadband access to network 130 for a plurality of first user equipment (UE) within the coverage area 120 of gNB 102. The plurality of first UEs includes UE 111 (which may be located in a small business), UE 112 (which may be located in an enterprise), UE113 (which may be a WiFi hotspot), UE 114 (which may be located in a first residence), UE 115 (which may be located in a second residence), and UE116 (which may be a mobile device, such as a mobile phone, a wireless laptop, a wireless personal digital assistant, etc.). gNB 103 provides wireless broadband access to network 130 for a plurality of second UEs within the coverage area 125 of gNB 103. The plurality of second UEs includes UE 115 and UE116. In some embodiments, one or more of gNB 101-103 may use 5G / NR, Long Term Evolution (LTE), Long Term Evolution-Advanced (LTE-A), WiMAX, WiFi, or other wireless communication technologies to communicate with UEs 111-116.

[0036] Depending on the network type, the term "base station" or "BS" can refer to any component (or collection of components) configured to provide wireless access to a network, such as a transmission point (TP), a transmission-reception point (TRP), an enhanced base station (eNodeB or eNB), a 5G / NR base station (gNB), a macro cell, a femto cell, a WiFi access point (AP), or other wireless-enabled devices. The base station can provide wireless access according to one or more wireless communication protocols (e.g., 5G / NR Third Generation Partnership Project (3GPP) NR, Long Term Evolution (LTE), LTE-Advanced (LTE-A), High Speed Packet Access (HSPA), WiFi 802.11a / b / g / n / ac, etc.). For convenience, the terms "BS" and "TRP" are used interchangeably in this patent document to refer to the network infrastructure components that provide wireless access to remote terminals. Additionally, depending on the network type, the term "user equipment" or "UE" can refer to any component such as a "mobile station", "user station", "remote terminal", "wireless terminal", "reception point", or "user equipment". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to the remote wireless devices that wirelessly access the BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or a device that is typically considered fixed (such as a desktop computer or vending machine).

[0037] The dashed lines indicate the approximate extent of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation. It should be clearly understood that the coverage areas associated with the gNB (e.g., coverage areas 120 and 125) can have other shapes, including irregular shapes, depending on the configuration of the gNB and the variations in the radio environment associated with natural and man-made obstacles.

[0038] As described in more detail below, one or more UEs 111-116 include circuitry, programming, or a combination thereof for CSI adaptation based on reference signals and wireless link monitoring. In certain embodiments, one or more BSs 101-103 include circuitry, programming, or a combination thereof that facilitates or supports CSI adaptation based on reference signals and wireless link monitoring.

[0039] Although Figure 1 an example of a wireless network is shown, Figure 1Various changes can be made. For example, the wireless network can include any number of gNBs and any number of UEs in any suitable arrangement. Additionally, gNB 101 can communicate directly with any number of UEs and provide these UEs with wireless broadband access to network 130. Similarly, each of gNBs 102 - 103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. Further, gNBs 101, 102, and / or 103 can provide access to other or additional external networks, such as an external telephone network or other types of data networks.

[0040] Figure 2 An exemplary gNB 102 according to the present disclosure is shown. Figure 2 The illustrated embodiment of gNB 102 is for illustrative purposes only, Figure 1 and other gNBs can have the same or similar configurations. However, gNBs have a wide variety of configurations, Figure 2 which do not limit the scope of the present disclosure to any particular implementation of a gNB. Note that gNB 101 and gNB 103 can include structures that are the same as or similar to that of gNB 102.

[0041] As Figure 2 shown, gNB 102 includes a plurality of antennas 205a - 205n, a plurality of RF transceivers 210a - 210n, transmit (TX) processing circuitry 240, and receive (RX) processing circuitry 245. In certain embodiments, one or more of the plurality of antennas 205a - 205n include a 2D antenna array. gNB 102 also includes a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0042] RF transceivers 210a - 210n receive incident RF signals from antennas 205a - 205n, such as signals transmitted by UEs or other gNBs. RF transceivers 210a - 210n down-convert the incident RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 245, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 245 sends the processed baseband signal to controller / processor 225 for further processing.

[0043] The TX processing circuit 240 receives analog or digital data (such as voice data, web data, e-mail, or interactive video game data) from the controller / processor 225. The TX processing circuit 240 encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The RF transceivers 210a - 210n receive the output processed baseband or IF signal from the TX processing circuit 240 and up-convert the baseband or IF signal into an RF signal transmitted through the antennas 205a - 205n.

[0044] The controller / processor 225 may include one or more processors or other processing devices for controlling the overall operation of the gNB 102. For example, the controller / processor 225 may control the RF transceivers 210a - 210n, the RX processing circuit 245, and the TX processing circuit 240 to receive forward channel signals and transmit reverse channel signals according to well-known principles. The controller / processor 225 may also support additional functions, such as more advanced wireless communication functions. For example, the controller / processor 225 may perform blind interference sensing (BIS) processing, such as the processing performed by a BIS algorithm, and decode the received signal minus the interference signal. The controller / processor 225 may support a variety of other functions in the gNB 102. In some embodiments, the controller / processor 225 includes at least one microprocessor or microcontroller.

[0045] The controller / processor 225 is also capable of executing programs and other processing residing in the memory 230, such as a basic OS. The controller / processor 225 is also capable of supporting channel quality measurement and reporting for a system with a 2D antenna array as described in the embodiments of the present disclosure. In some embodiments, the controller / processor 225 supports communication between entities, such as Web RTC. The controller / processor 225 may move data into or out of the memory 230 according to the processing needs.

[0046] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems through a backhaul connection or network. The interface 235 may support communication through any suitable wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a system supporting 5G, LTE, or LTE-A), the interface 235 may allow the gNB 102 to communicate with other gNBs through a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 may allow the gNB 102 to communicate with a larger network (such as the Internet) through a wired or wireless local area network, or through a wired or wireless connection. The interface 235 includes any suitable structure for supporting communication through a wired or wireless connection, such as an Ethernet or an RF transceiver.

[0047] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory or other ROM.

[0048] Although Figure 2 one example of gNB 102 is shown, various changes may be made to Figure 2 it. For example, gNB 102 may include Figure 2 any number of each component shown. As a specific example, the access point may include multiple interfaces 235, and controller / processor 225 may support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of TX processing circuit 240 and a single instance of RX processing circuit 245, gNB 102 may include multiple instances (e.g., one for each RF transceiver). In embodiments of the present disclosure, a gNB (such as gNB 102 as Figure 2 shown) supports CSI and radio link monitoring based on reference signal adaptation.

[0049] Figure 3 An exemplary UE 116 according to the present disclosure is shown. Figure 3 The illustrated embodiment of UE 116 is for illustration only, Figure 1 and UEs 111 - 115 may have the same or similar configurations. However, UEs have a wide variety of configurations, Figure 3 and do not limit the scope of the present disclosure to any particular implementation of a UE.

[0050] UE 116 includes antenna 305, radio frequency (RF) transceiver 310, transmit (TX) processing circuit 315, microphone 320, and receive (RX) processing circuit 325. UE 116 also includes speaker 330, processor 340, input / output (I / O) interface (IF) 345, input device 350, display 355, and memory 360. Memory 360 includes a basic operating system (OS) program 361 and one or more applications 362.

[0051] RF transceiver 310 receives an incident RF signal transmitted by gNB of network 100 from antenna 305. RF transceiver 310 downconverts the incident RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuit 325, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuit 325 sends the processed baseband signal to speaker 330 (e.g., for voice data) or to processor 340 for further processing (e.g., for web browsing data).

[0052] The TX processing circuit 315 receives analog or digital voice data from the microphone 320, or other output baseband data (such as web data, e-mail, or interactive video game data) from the processor 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the output processed baseband or IF signal from the TX processing circuit 315 and upconverts the baseband or IF signal into an RF signal transmitted through the antenna 305.

[0053] The processor 340 may include one or more processors or other processing devices and execute the basic OS program 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor 340 may control the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 to receive forward channel signals and transmit reverse channel signals according to well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0054] The processor 340 is also capable of executing other processes and programs residing in the memory 360, such as, for example, channel quality measurement and reporting operations for a system with a 2D antenna array as described in embodiments of the present disclosure. The processor 340 may move data into or out of the memory 360 according to the processing needs of the executed processes. In some embodiments, the processor 340 is configured to execute the application 362 based on the OS program 361 or in response to signals received from the gNB or the operator. The processor 340 is also coupled to the I / O interface 345, and the I / O interface 345 enables the UE 116 to connect to other devices, such as laptop computers and handheld computers. The I / O interface 345 is a communication path between these accessories and the processor 340.

[0055] The processor 340 is also coupled to the input device 350 and the display unit 355. The operator of the UE 116 may use the input device 350 to input data to the UE 116. The display 355 may be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as graphics from a website). The memory 360 is coupled to the processor 340. A portion of the memory 360 may include random access memory (RAM), and another portion of the memory 360 may include flash memory or other read-only memory (ROM).

[0056] Although Figure 3 an example of the UE 116 is shown, various changes may be made to Figure 3 it. For example, Figure 3The various components therein can be combined, further subdivided, or omitted according to specific needs, and additional components can be added. As a specific example, the processor 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). In addition, although Figure 3 it is shown that the UE 116 is configured as a mobile phone or a smart phone, the UE can be configured to operate as other types of mobile or fixed devices. In an embodiment of the present disclosure, a UE such as Figure 3 the UE 116 as shown performs CSI and radio link monitoring based on reference signal adaptation.

[0057] Figure 4A and 4B show an exemplary wireless transmit and receive path according to the present disclosure. In the following description, the transmit path 400 can be described as being implemented in a gNB (such as gNB 104), and the receive path 450 can be described as being implemented in a UE (such as UE116). However, it should be understood that the receive path 450 can also be implemented in a gNB, and the transmit path 400 can also be implemented in a UE.

[0058] The transmit path 400 includes a channel coding and modulation block 405, a serial-to-parallel conversion (S-to-P) block 410, an N-point inverse fast Fourier transform (IFFT) block 415, a parallel-to-serial conversion (P-to-S) block 440, a cyclic prefix addition block 445, and an upconverter (UC) 430. The receive path 450 includes a downconverter (DC) 455, a cyclic prefix removal block 460, a serial-to-parallel conversion (S-to-P) block 465, an N-point fast Fourier transform (FFT) block 470, a parallel-to-serial conversion (P-to-S) block 475, and a channel decoding and demodulation block 480.

[0059] In the transmit path 400, the channel coding and modulation block 405 receives a set of information bits, applies coding (e.g., low density parity check (LDPC) coding), and modulates the input bits (e.g., using quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. The serial-to-parallel conversion block 410 converts (e.g., demultiplexes) the serial modulated symbols into parallel data to generate N parallel symbol streams, where N is the IFFT / FFT size used in gNB 104 and UE 116. The N-point IFFT block 415 performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial conversion block 440 converts (e.g., multiplexes) the parallel time-domain output symbols from the N-point IFFT block 415 into a serial time-domain signal. The cyclic prefix addition block 445 inserts a cyclic prefix into the time-domain signal. The upconverter 430 modulates (e.g., upconverts) the output of the cyclic prefix addition block 445 to an RF frequency for transmission over the wireless channel. The signal may also be filtered in the baseband before being converted to the RF frequency.

[0060] The RF signal transmitted by gNB 104 arrives at UE 116 after passing through the wireless channel, and the opposite operations are performed at UE 116 to those at gNB 104. The downconverter 455 downconverts the received signal to a baseband frequency, and the cyclic prefix removal block 460 removes the cyclic prefix to generate a serial time-domain baseband signal. The serial-to-parallel conversion block 465 converts the time-domain baseband signal into parallel time-domain signals. The N-point FFT block 470 performs an FFT algorithm to generate N parallel frequency-domain signals. The parallel-to-serial conversion block 475 converts the parallel frequency-domain signals into a sequence of modulated data symbols. The channel decoding and demodulation block 480 demodulates and decodes the modulated symbols to recover the original input data stream.

[0061] Each gNB 101 - 103 may implement a transmit path 400 similar to that for transmitting downlink to UEs 111 - 116, and a receive path 450 similar to that for receiving uplink from UEs 111 - 116. Similarly, each UE 111 - 116 may implement a transmit path 400 for transmitting uplink to gNBs 101 - 103, and a receive path 450 for receiving downlink from gNBs 101 - 103. In an embodiment, the transmit path 400 and the receive path 450 are each configured to support CSI and radio link monitoring adapted based on reference signals.

[0062] Figure 4A and 4B each component in may be implemented using only hardware, or using a combination of hardware and software / firmware. As a specific example, Figure 4A and 4BAt least some of the components therein may be implemented in software, while other components may be implemented by configurable hardware, or by a combination of software and configurable hardware. For example, the FFT block 470 and the IFFT block 415 may be implemented as configurable software algorithms, where the size of N points may be modified according to the implementation.

[0063] In addition, although described as using FFT and IFFT, this is only an example and should not be construed as limiting the scope of the present disclosure. Other types of transforms may be used, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of the variable N can be any integer (e.g., 1, 4, 3, 4, etc.), while for FFT and IFFT functions, the value of the variable N can be any integer power of 2 (e.g., 1, 4, 4, 8, 16, etc.).

[0064] Although Figure 4A and 4B show an example of a wireless transmit and receive path, various changes can be made to Figure 4A and 4B For example, Figure 4A and 4B the various components in can be combined, further subdivided or omitted according to specific needs, and additional components can be added. In addition, Figure 4A and 4B are intended to show examples of the types of transmit and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0065] Hereinafter, the italicized name of a parameter indicates that the parameter is provided by a higher layer.

[0066] DL transmission or UL transmission may be based on an OFDM waveform, and the OFDM waveform includes a variant using DFT precoding, called DFT-s-OFDM, which is generally applicable to UL transmission.

[0067] In the following, a subframe (SF) refers to the transmission time unit of the LTE RAT, and a slot refers to the transmission time unit of the NR RAT. For example, the slot duration can be a submultiple of the SF duration. NR can use a DL or UL slot structure different from the LTE SF structure. The differences can include the transmission structure of the physical downlink control channel (PDCCH), the position and structure of the demodulation reference signal (DM-RS), the transmission duration, etc. In addition, an eNB refers to a base station serving a UE using the LTE RAT, and a gNB refers to a base station serving a UE using the NR RAT. Exemplary embodiments consider the same set of parameters, which includes the subcarrier spacing (SCS) configuration and the cyclic prefix (CP) length for LTE RAT and NR RAT transmissions. In this case, the OFDM symbols of the LTE RAT are the same as those of the NR RAT, and the subframe is the same as the slot. For the sake of brevity, the remaining part of this disclosure subsequently uses the term slot.

[0068] The unit of DL signaling or UL signaling on a cell is called a slot, which may include one or more symbols. The bandwidth (BW) unit is called a resource block (RB). One RB includes multiple subcarriers (SC). For example, the duration of a slot can be one millisecond, the bandwidth of an RB can be 180 kHz, and it includes SCs with an interval of 15 kHz between 12 SCs. The subcarrier spacing (SCS) can be determined by the SCS configuration as kHz. The unit of one subcarrier on one symbol is called a resource element (RE). The unit of one RB on one symbol is called a physical RB (PRB).

[0069] DL signaling includes the physical downlink shared channel (PDSCH) for transmitting information content, the PDCCH for transmitting DL control information (DCI), and the reference signal (RS). The PDCCH can be transmitted on a variable number of slot symbols including one slot symbol, and is transmitted on a set of a predetermined number of control channel elements (CCE) within a control resource set (CORESET), which is called the CCE aggregation level, as described in REF1 and REF3.

[0070] Figure 5 A block diagram of an exemplary transmitter structure 500 using OFDM according to the present disclosure is shown. Figure 5 The embodiments of the exemplary transmitter structure 500 shown are for illustrative purposes only. Figure 5 One or more of the components shown can be implemented in a dedicated circuit configured to perform the functions, or one or more of the components can be implemented by one or more processors executing instructions to perform the functions. Figure 5 The scope of the present disclosure is not limited to any particular implementation of the exemplary transmitter structure 500.

[0071] Information bits (such as DCI bits or data bits 510) are encoded by an encoder 520, rate-matched by a rate matcher 530 to the allocated time / frequency resources, and modulated by a modulator 540. Subsequently, the modulated coded symbols and DM-RS or CSI-RS 550 are mapped to REs 560 by an RE mapping unit 565, a filter 570 performs an inverse fast Fourier transform (IFFT), a CP insertion unit 580 adds a cyclic prefix (CP), the resulting signal is filtered by a filter 590 and transmitted by a radio frequency (RF) unit 595. In an embodiment, the transmitter structure 500 can be used to facilitate CSI enhancement for network parameter adaptation.

[0072] Figure 6 A block diagram of an exemplary receiver structure 600 using OFDM according to the present disclosure is shown. Figure 6 The embodiment of the exemplary receiver structure 600 shown is for illustrative purposes only. Figure 6 It does not limit the scope of the present disclosure to any particular implementation of this exemplary receiver structure 600.

[0073] A received signal 610 is filtered by a filter 620, a CP removal unit removes the CP 630, a filter 640 applies a fast Fourier transform (FFT), an RE demapping unit 650 demaps the REs selected by a BW selector unit 655, the received symbols are demodulated by a channel estimator and demodulator unit 660, a rate dematcher 670 restores the rate matching, and a decoder 680 decodes the resulting bits to provide information bits 690. In an embodiment, the receiver structure 600 can be used to facilitate CSI enhancement for network parameter adaptation.

[0074] The DCI can be used for multiple purposes. The DCI format includes information elements (IEs), which are typically used to schedule PDSCH (DL DCI format) transmissions or schedule PUSCH (UL DCI format) transmissions. The DCI format includes cyclic redundancy check (CRC) bits so that the UE can confirm correct detection. The DCI format type is identified by the radio network temporary identifier (RNTI) used to scramble the CRC bits. For the DCI format that schedules the PDSCH or PUSCH for a single UE having an RRC connection with the gNB, the RNTI is the cell RNTI (C-RNTI) or other RNTI types (such as MCS-C-RNTI). For the DCI format that schedules the PDSCH for transmitting system information (SI) to a group of UEs, the RNTI is the SI-RNTI. For the DCI format that schedules the PDSCH for sending random access (RA) responses to a group of UEs, the RNTI is the RA-RNTI. For the DCI format that schedules the PDSCH for providing contention resolution in Msg4 of the RA procedure, the RNTI is the temporary C-RNTI (TC-RNTI). For the DCI format that schedules the PDSCH for paging a group of UEs, the RNTI is the P-RNTI. For the DCI format that provides a transmission power control (TPC) command to a group of UEs, the RNTI is the TPC-RNTI, and so on. Each RNTI type is configured for the UE through higher layer signaling. The UE typically decodes potential PDCCH transmissions at multiple candidate locations.

[0075] Figure 7 A block diagram of an exemplary encoding process 700 of the DCI format according to the present disclosure is shown. Figure 7 The embodiments of the exemplary encoding process 700 shown are for illustrative purposes only. Figure 7 One or more of the components shown may be implemented in a dedicated circuit configured to perform the functions, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions. Figure 7 It does not limit the scope of the present disclosure to any particular implementation of the exemplary encoding process 700.

[0076] The gNB encodes and transmits each DCI format in its respective PDCCH. When applicable, the RNTI of the UE to which the DCI format is targeted masks the CRC of the DCI format codeword so that the UE can identify the DCI format. For example, the CRC may include 24 bits and the RNTI may include 16 bits or 24 bits. The CRC of the (uncoded) DCI format bits 710 is determined using the CRC calculation unit 720, and the CRC is masked using the exclusive OR (XOR) operation unit 730 between the CRC bits and the RNTI bits 740. The XOR operation is defined as XOR(0,0)=0, XOR(0,1)=1, XOR(1,0)=1, XOR(1,1)=0. The masked CRC bits are appended to the DCI format information bits using the CRC append unit 750. The encoder 760 performs channel coding (e.g., polar coding), which is then rate matched to the allocated resources by the rate matcher 770. The interleaving and modulation unit 780 applies interleaving and modulation (e.g., QPSK) and transmits the output control signal 790. In an embodiment, the encoding process 700 can be used to facilitate CSI enhancement for network parameter adaptation.

[0077] Figure 8 A block diagram illustrating an exemplary decoding process 800 for a DCI format for a UE according to the present disclosure is shown. Figure 8 The embodiments of the exemplary decoding process 800 shown are for illustrative purposes only. Figure 8 They do not limit the scope of the present disclosure to any particular implementation of the exemplary decoding process 800.

[0078] The received control signal 810 is demodulated and deinterleaved by the demodulator and deinterleaver 820. The rate matching applied at the gNB transmitter is restored by the rate matcher 830, and the resulting bits are decoded by the decoder 840. After decoding, the CRC extractor 850 extracts the CRC bits and provides the DCI format information bits 860. The DCI format information bits are demasked (when applicable) by the XOR operation 870 with the RNTI 880, and the CRC check is performed by the unit 890. When the CRC check is successful (checksum is zero), the DCI format information bits are considered valid. When the CRC check is not successful, the DCI format information bits are considered invalid. In an embodiment, the decoding process 800 can be used to facilitate CSI enhancement for network parameter adaptation.

[0079] For each DL bandwidth part (BWP) indicated to the UE in the serving cell, the UE can obtain a control resource set (CORESET). For each CORESET, the UE is provided with the CORESET index p ( ), the initialization value of the DM-RS scrambling sequence, the precoder granularity of the number of resource element groups (REGs) in the frequency domain (the UE can assume the use of the same DM-RS precoder), the number of consecutive symbols of the CORESET, the set of resource blocks (RBs) of the CORESET, the mapping parameter from CCE to REG, the antenna port quasi-co-location from a set of antenna port quasi-co-locations (indicating the quasi-co-location information of the DM-RS antenna port used for PDCCH reception in the corresponding CORESET), and an indication of whether there is a transmission configuration indication (TCI) field for DCI format 1_1 transmitted by the PDCCH in CORESET p.

[0080] For each DL BWP configured for the UE in the serving cell, the UE obtains via higher layers a set of search spaces. For each search space set in the S search space sets, the UE is provided with a search space set index s ( ), the association between the search space set s and CORESET p, k s PDCCH monitoring periods of time slots and O s PDCCH monitoring offsets of time slots, the PDCCH monitoring mode within the time slot (indicating the first symbol of the CORESET used for PDCCH monitoring within the time slot), T s <k s the duration of the time slots (indicating the number of time slots in which the search space set s exists), the number of PDCCH candidates for each CCE aggregation level L , and an indication of whether the search space set s is a CSS set or a USS set. When the search space set s is a CSS set, the UE monitors the PDCCH to detect DCI format 2_x (where x ranges from 0 to 7, as described in REF2) or to detect the DCI format associated with scheduling the reception of broadcast / multicast PDSCH, and can detect DCI format 0_0 and DCI format 1_0.

[0081] The UE determines the PDCCH monitoring occasion on the active DL BWP from the PDCCH monitoring period, the PDCCH monitoring offset, and the PDCCH monitoring mode within the time slot. For the search space set s, if , the UE determines that there is a PDCCH monitoring occasion in the time slot numbered of the frame numbered . The UE starts from time slot and monitors the PDCCH candidates of the search space set s in T s consecutive time slots, and in the next k s - T sDo not monitor the PDCCH candidates of the search space set s in consecutive time slots. The UE determines the CCEs for monitoring the PDCCH based on the search space set according to the search space equation as described in REF3.

[0082] The UE expects to monitor up to 4 sizes of DCI formats for each serving / scheduled cell, including up to 3 sizes of DCI formats with CRC scrambled by C-RNTI. The UE calculates the number of DCI format sizes for each serving / scheduled cell based on the number of PDCCH candidates in the search space set of the corresponding active DL BWP. Hereinafter, for the sake of brevity, this constraint on the number of DCI format sizes is referred to as the DCI size limit. When the DCI size limit is exceeded based on the DCI format configuration for which the UE monitors the PDCCH, the UE adjusts the sizes of certain DCI formats as described in REF2 so that the DCI size limit is not exceeded.

[0083] For each scheduled cell, the UE does not need to monitor more than PDCCH candidates or more than non-overlapping CCEs per time slot on the active DL BWP (with SCS configuration µ) of the scheduled cell, where and are the maximum numbers of PDCCH candidates and non-overlapping CCEs of the scheduled cell, respectively, and and are the total numbers of PDCCH candidates and non-overlapping CCEs of the scheduled cell, respectively, as described in REF3.

[0084] The UE does not expect to be configured with CSS sets other than the CSS sets for multicast PDSCH scheduling that result in the total number of PDCCH candidates and non-overlapping CCEs monitored per time slot on the primary cell or the number per scheduled cell exceeding the corresponding maximum number per time slot. For the USS set or the CSS set associated with multicast PDSCH scheduling, when the number of PDCCH candidates or non-overlapping CCEs in a time slot will exceed the above-mentioned per-time-slot limit / maximum for primary cell scheduling, the UE selects the USS set or the CSS set to monitor the corresponding PDCCH in ascending order of the index of the corresponding search space set until the index of the search space set for which PDCCH monitoring will result in exceeding the maximum number of PDCCH candidates or non-overlapping CCEs per time slot for PCell scheduling, as described in REF3.

[0085] For the same cell scheduling, or for the scheduled cell and the serving cell having the same SCS configuration For cross-carrier scheduling of a DL BWP, the UE does not expect the number of PDCCH candidates per time slot and the corresponding number of non-overlapping CCEs on the secondary cell to be greater than the corresponding number that the UE can monitor within each time slot on the secondary cell. For cross-carrier scheduling, the number of PDCCH candidates for monitoring per time slot and the number of non-overlapping CCEs are calculated separately for each scheduled cell.

[0086] The UE can be configured to receive for PDSCH on multiple cells (DL CA) or transmit for PUSCH on multiple cells (UL CA) via carrier aggregation (CA). The UE can also configure multiple transmission and reception points (TRPs) for each cell via the indication (or absence of indication) of a CORESET, as described in REF3 and REF4, where the UE receives PDCCH / PDSCH from the corresponding TRP. coresetPoolIndex For each cell, the UE can be configured with multiple transmission and reception points (TRPs) via the indication (or absence of indication) of a CORESET, as described in REF3 and REF4, where the UE receives PDCCH / PDSCH from the corresponding TRP.

[0087] MIMO technology has always been a key role in enhancing system throughput in NR and LTE, and this role will continue and be further extended in future generations of wireless technologies.

[0088] An antenna port is defined such that the channel through which the symbols transmitted on that antenna port pass can be inferred from the channel through which another symbol on the same antenna port passes. There is not necessarily a one-to-one correspondence between an antenna port and an antenna element, and multiple antenna elements can be mapped to one antenna port.

[0089] For the millimeter wave band, although the number of antenna elements can be larger relative to a given form factor, due to hardware limitations (such as the feasibility of installing a large number of analog-to-digital converters (ADCs) / digital-to-analog converters (DACs) at millimeter wave frequencies), the number of CSI-RS ports (which can correspond to the number of digital precoding ports) is often limited, as Figure 8 shown. In this case, one CSI-RS port is mapped to a large number of antenna elements, which can be controlled by a set of analog phase shifters. Then, one CSI-RS port can correspond to a subarray, which generates a narrow analog beam through analog beamforming. This analog beam can be configured to sweep over a wider angular range by changing the set of phase shifters on symbols, time slots, or subframes. The number of subarrays (equal to the number of RF chains) is the same as the number N of CSI-RS ports. CSI-PORT The digital beamforming unit linearly combines the N CSI-PORT analog beams to further increase the precoding gain. Although the analog beam is broadband (and thus not frequency selective), the digital precoding can vary over frequency subbands or resource blocks.

[0090] Figure 9 An exemplary antenna block or array 900 for forming a beam according to an embodiment of the present disclosure is shown.Figure 9 The illustrated embodiment of the antenna block or array 900 is for illustrative purposes only. Figure 9 It does not limit the scope of the present disclosure to any particular implementation of the antenna block or array 900.

[0091] The Rel-15 NR specification supports up to 32 CSI-RS antenna ports, which enables the gNB to be equipped with a large number of antenna elements (e.g., 64 or 128). In this case, multiple antenna elements are mapped to one CSI-RS port. For FR2 (e.g., millimeter wave band), although the number of antenna elements can be relatively larger for a given form factor, due to hardware limitations (e.g., the feasibility of installing a large number of ADC / DACs at millimeter wave frequencies), the number of CSI-RS ports (which can correspond to the number of digital precoding ports) tends to be limited, as Figure 9 shown. In this case, one CSI-RS port is mapped to a large number of antenna elements, which can be controlled by a set of analog phase shifters 901. Then, one CSI-RS port can correspond to a subarray, which generates a narrow analog beam through analog beamforming 905. This analog beam can be configured to sweep a wider angular range (920) by changing the set of phase shifters over symbols or subframes. The number of subarrays (equal to the number of RF chains) is the same as the number N of CSI-RS ports CSI-PORT The digital beamforming unit 910 linearly combines the N CSI-PORT analog beams to further increase the precoding gain. Although the analog beams are broadband (and thus not frequency selective), the digital precoding can vary over frequency subbands or resource blocks. The receiver operation can be designed similarly.

[0092] Since the above system uses multiple analog beams for transmission and reception (where, for example, one or a small number of analog beams are selected from a large number of analog beams after a training period that needs to be performed from time to time), the term "multi-beam operation" is used to refer to the overall system aspect. For illustrative purposes, this includes indicating the assigned DL or UL transmission (TX) beam (also called "beam indication"), measuring at least one reference signal to calculate and perform beam reporting (also called "beam measurement" and "beam reporting" respectively), and receiving DL or UL transmission through the selection of the corresponding receive (RX) beam.

[0093] The above system is also applicable to higher frequency bands, such as FR2-2 (e.g., >52.6 GHz). In this case, the system can adopt only analog beams. Given the O2 absorption loss near 60 GHz (an additional loss of about 10 dB at about 100 m distance), a larger number of and sharper analog beams (and thus a larger number of radiators in the array) will be required to compensate for the additional path loss. The antenna block or array 900 can be used to facilitate CSI enhancement for network parameter adaptation as discussed in more detail below. In an embodiment of the present disclosure, the exemplary antenna block or array 900 for forming beams can facilitate CSI enhancement for network parameter adaptation.

[0094] To implement digital precoding, an efficient design of CSI-RS is a key factor. To this end, Rel.13 LTE supports three CSI reporting mechanisms corresponding to three CSI-RS measurement behaviors: 1) "CLASS A" CSI reporting, which corresponds to non-precoded CSI-RS; 2) "CLASS B" reporting with K = 1 CSI-RS resource, which corresponds to UE-specific beamforming CSI-RS; 3) "CLASS B" reporting with K>1 CSI-RS resources, which corresponds to cell-specific beamforming CSI-RS. For non-precoded (NP) CSI-RS, a one-to-one mapping between cell-specific CSI-RS ports and TXRUs is utilized. Here, different CSI-RS ports have the same wide beam width and direction, and thus are typically for cell-wide coverage. For beamforming CSI-RS, beamforming operations are applied on non-zero power (NZP) CSI-RS resources (composed of multiple ports), whether cell-specific or UE-specific. Here, (at least at a given time / frequency) CSI-RS ports have a narrow beam width, and thus are not for cell-wide coverage, and (at least from the perspective of the eNB) at least some CSI-RS port-resource combinations have different beam directions. The basic principle remains the same in NR.

[0095] In scenarios where DL long-term channel statistics can be measured by UL signals of the serving gNB, UE-specific beamforming CSI-RS can be easily used. This is typically feasible when the duplex distance between UL and DL is small enough. However, when this condition does not hold, some UE feedback is required to enable the gNB to obtain an estimate (or any representation thereof) of the DL long-term channel statistics. To facilitate such a process, a first beamforming CSI-RS is transmitted with a period T1 (ms), and a second NP CSI-RS is transmitted with a period T2 (ms), where T1 ≤ T2. This method is called hybrid CSI-RS. The implementation of hybrid CSI-RS depends to a large extent on the CSI process and the definition of NZP CSI-RS resources.

[0096] One of the key components of the MIMO transmission scheme is to accurately obtain CSI at the gNB (or TRP). Especially for MU-MIMO, the availability of accurate CSI is necessary to ensure high MU performance. For TDD systems, CSI can be obtained by using SRS transmissions that rely on channel reciprocity. On the other hand, for FDD systems, CSI can be obtained by using CSI-RS transmissions from the gNB and CSI acquisition and feedback from the UE. In LTE up to Rel.13, for FDD systems, the CSI feedback framework existed "implicitly" in the form of CQI / PMI / RI (and CRI in Rel.13) (derived from codebooks assuming SU transmissions from the eNB). Due to the inherent SU assumption when deriving CSI, this implicit CSI feedback is not sufficient for MU transmission. On the other hand, the NR system has been designed to be more MU-centric since its first version, and in addition to the low-resolution Type-I codebook, it also has a high-resolution Type-II codebook.

[0097] Among various high-layer signaling from the serving gNB to the UE (further described in REF6), a set of IEs relevant to the present disclosure are described below.

[0098] To configure Type-I and Type-II codebooks for the UE by the serving gNB using high-layer signaling, use the IE CodebookConfig : codebookType including type1 , type2 and possible subtypes (e.g., typeI- SinglePanel , typeI-MultiPanel , typeII and typeII-PortSelection ) and the corresponding parameters of each type; n1-n2 for configuring the number of antenna ports in the first (n1) and second (n2) dimensions and typeI-SinglePanel the codebook subset restriction; ng-n1-n2 for configuring the number of antenna panels (ng), the number of antenna ports in the first (n1) and second (n2) dimensions assuming the configured number of panels is consistent with the antenna structure, and Type I Multi-panel the codebook subset restriction of the codebook; n1-n2-codebookSubsetRestriction for configuring the number of antenna ports in the first (n1) and second (n2) dimensions and typeII the codebook subset restriction; CodebookConfig-r17 including for type1 of typeI-SinglePanel1-r17 and typeI-SinglePanel2-r17 to allow different antenna structures to be configured for two TRPs.

[0099] To indicate the resource element mapping of CSI-RS resources in the time domain and frequency domain, use the IE CSI-RS-ResourceMapping The container includes elements for time-domain and frequency-domain resource configuration, such as firstOFDMSymbolInTimeDomain、firstOFDMSymbolInTimeDomain2 and frequencyDomainAllocation , CSI-RS density ( density ), number of ports ( nrofPorts ), etc. The IE CSI- RS-ResourceMapping includes NZP-CSI-RS-Resource and ZP-CSI-RS-Resource configuration, which is included in CSI-ResourceConfig . The IE CSI-ResourceConfig defines a group containing one or more NZP-CSI-RS- ResourceSet , CSI-IM-ResourceSet and / or CSI-SSB-ResourceSet .

[0100] The IE CSI-ReportConfig is used to indicate to the UE the parameters for providing periodic or semi-persistent CSI reports via PUCCH transmission on the cell containing CSI-ReportConfig , or to indicate the parameters for providing semi-persistent or aperiodic CSI reports on the PUSCH triggered by the DCI received by the UE. CSI-ReportConfig For a specific CSI- ResourceConfigId , settings are made for channel / interference measurement. The above CodebookConfig is also CSI-ReportConfig part of.

[0101] For aperiodic CSI, both aperiodic CSI reporting and aperiodic CSI-RS transmission are triggered using the "CSI request" field within the DCI format for scheduling PUSCH transmission, such as DCI format 0_1. This "CSI request" field indicates the "trigger state", and the "trigger state" points to a specific CSI-ReportConfigId and resourcesForChannel (e.g., NZP- CSI-RS-ResourceSet ). The "CSI request" field can have up to 6 bits and can indicate up to 64 "trigger states". If the UE is configured with more than 64 "trigger states", the "aperiodic CSI trigger state sub-selection" MAC CE identifies the subset of trigger states indicated by the DCI.

[0102] For semi-persistent CSI on the PUCCH, the semi-persistent CSI-RS resources are triggered by the "SP CSI-RS / CSI-IM resource set activation / deactivation" MAC CE, which contains the SP CSI-RS resource set ID, and the SP CSI-RS resource set ID indicates the NZP-CSI-RS-ResourceSetThe index of the semi-persistent NZP CSI-RS resource indicates the semi-persistent NZP CSI-RS resource set. The semi-persistent CSI report on PUCCH is triggered using the "SPCSI reporting on PUCCH activate / deactivate" MAC CE. The field in the MAC CE S i instruct csi- ReportConfigToAddModList The activation / deactivation status of the semi-persistent CSI reporting configuration. S 0 Refers to the PUCCH resources for semi-persistent CSI reporting included in the indicated BWP and when the type is set to semiPersistentOnPUCCH In the list CSI-ReportConfigId The minimum reporting configuration, S1, refers to the inclusion of PUCCH resources for semi-persistent CSI reporting in the indicated BWP and CSI-ReportConfigId The second lowest reported configuration, and so on.

[0103] For semi-persistent CSI reporting on PUSCH, the CSI request field in DCI format 0_1 with CRC scrambled by SP-CSI-RNTI is used to trigger CSI reporting. The operation details are similar to those for aperiodic CSI reporting.

[0104] For periodic CSI reporting, both reporting and periodic CSI-RS resources are determined by CSI-ReportConfig Configure and start.

[0105] Current networks have limited capabilities for adapting their operating states in one or more of the time, frequency, space, and power domains. For example, in NR, there are transmissions or receptions that the UE expects from the serving gNB, such as transmission of SS / PBCH blocks, transmission of system information, transmission of CSI-RS as indicated by higher layers, or reception of PRACH or SRS as indicated by higher layers. Reconfiguring the NW's operating state involves higher-layer signaling via SIBs or UE-specific RRC. This is a slow process and requires significant signaling overhead, particularly for UE-specific RRC signaling. For example, in typical deployments, it is often impractical or impossible for the network to enter a power-saving state (where the network does not transmit or receive due to low traffic) because, to achieve substantial power savings, the network would need to suspend transmission or reception for periods of tens of milliseconds, or even longer. Suspending transmission or reception for shorter periods is similarly impractical because the serving gNB may need to transmit SS / PBCH blocks frequently (e.g., every 5 or 20 milliseconds), and in TDD systems with UL-DL configurations with fewer UL symbols in a cycle, the serving gNB may need to receive PRACH or SRS in most UL symbols within the cycle.

[0106] Due to the above reasons, the adaptation of the NW operation state is usually carried out over a relatively long period of time, such as during off-peak hours with low service traffic and during peak hours with high service traffic. Therefore, the ability of the gNB to improve the service by quickly adapting the network operation state to the traffic type and load, or to save energy by switching to a state that requires less energy consumption when the impact on the quality of service is limited or non-existent, is currently limited because there is no process for the serving gNB to perform a quick adaptation of the NW operation state with low signaling overhead while notifying all UEs of the network operation state.

[0107] It is also beneficial to support a gradual transition of the NW operation state between the maximum state (where the NW operates at its maximum capacity in one or more of the time / frequency / space / power domains) and the minimum state (where the NW operates at its minimum capacity or the NW enters the sleep mode). This will enable the service to continue when the NW transitions from a state with a higher utilization rate of time / frequency / space / power resources to a state with a lower utilization rate of such resources, and vice versa, because the UE can obtain time / frequency synchronization and automatic gain controller (AGC) calibration before scheduling PDSCH reception or PUSCH transmission, perform measurements, and provide CSI reports or send SRS.

[0108] To enable the gNB to sleep and save energy while minimizing the impact on the served UEs, the gNB can apply cell DTX or cell DRX to the serving cell. The UEs in the cell can be informed of the corresponding cell DTX / DRX configuration so that the UEs can operate accordingly and avoid power consumption when the serving gNB is in the dormant state (cell DTX / DRX). By turning off all or part of the transmission chain and pausing the transmission during cell DTX, the gNB can reduce the standby power consumption when there is little traffic. For cell DTX, the UE can assume that all transmissions from the serving gNB are paused, or the UE can assume that certain signals (such as PSS or SSS for maintaining synchronization) still exist during cell DTX. By turning off all or part of the receiving chain and pausing the reception during cell DRX, the gNB can reduce the standby power consumption when there is little traffic. For cell DRX, the UE can assume that all transmissions from the UE are paused, or it can be assumed that certain transmissions (such as transmissions required for initial access, such as PRACH) are allowed during the cell DRX duration.

[0109] Figure 10 A block diagram 1000 of cell DTX / DRX according to an embodiment of the present disclosure is shown. Figure 10 The embodiment of the shown block diagram 1000 is for illustrative purposes only. Figure 10 It does not limit the scope of the present disclosure to any specific implementation.

[0110] As Figure 10As shown, the cell DTX / DRX can be configured by at least a period, a starting time slot / offset, and an on-duration. The UE assumes that all transmissions / receptions of the gNB are enabled respectively within the on-duration of the DTX / DRX. The configurations and operations of the cell DTX and the cell DRX can be associated or separate, for example depending on the DL / UL traffic characteristics.

[0111] In a gNB equipped with massive MIMO antennas, the power consumption of the power amplifiers (PAs) of each group of antenna elements (AEs) accounts for a large part of the total power consumption. For network energy saving, when the traffic load is low, the gNB can turn off a part of the PAs or reduce the PA output power level. For the sake of simplicity, in this embodiment of the present disclosure, such operations are respectively referred to as spatial domain (SD) adaptation or power domain (PD) adaptation. Unlike Figure 9 the cell DTX / DRX shown, one advantage of SD / PD adaptation is that the network can maintain the continuity of transmissions and receptions by operating with reduced capabilities without interrupting them.

[0112] Figure 11 FIG. 1100 shows a schematic diagram of spatial element adaptation in a sub-array partitioning model and a fully connected model. Figure 11 The embodiments of the schematic diagram 1100 shown are for illustrative purposes only. Figure 11 They do not limit the scope of the present disclosure to any specific implementation of the schematic diagram 1100.

[0113] The gNB can enable / disable all AEs associated with a logical antenna port, or enable / disable a part of the AEs associated with a logical antenna port. For the sake of simplicity, in this embodiment of the present disclosure, these adaptations of the AEs are respectively referred to as type 1 SD adaptation and type 2 SD adaptation. The gNB can perform type 1 SD adaptation, type 2 SD adaptation, or both.

[0114] In a Figure 9 hybrid beamforming system as shown, one antenna port is connected to a large number of AEs, and these AEs can be controlled by a group of analog phase shifters, which is called TxRU virtualization. TxRU virtualization can be implemented based on a sub-array partitioning model, a fully connected model, or a combination thereof, as Figure 11 shown. In the sub-array partitioning model, spatial element adaptation can result in type 1 SD adaptation and type 2 SD adaptation. In the case of type 1 SD adaptation, the PAs connected to the AEs associated with the logical antenna port and the subsequent RF chains (such as ADC / DAC, etc.) associated with the logical antenna port can all be turned off. In the fully connected model, spatial element adaptation can only result in type 2 SD adaptation unless all antenna ports are turned off.

[0115] The impact of type 1 SD adaptation results in a change in the number of active antenna ports or the overall antenna structure. The RF characteristics (such as radiation power, beam pattern, etc.) of the remaining antenna ports remain unchanged. The impact of type 2 SD adaptation results in a change in the RF characteristics of the antenna ports affected by AE on / off, while the number of antenna ports remains unchanged. The impact of PD adaptation is similar to that of type 2 SD adaptation. The gNB can perform any combination of type 1 SD, type 2 SD, and PD adaptation together with other time / frequency domain adaptation techniques (such as cell DTX / DRX).

[0116] For SD / PD adaptation, the CSI-RS transmission power may change. The UE needs to be informed of this change so that the UE can accurately determine the CSI report (such as the CQI mapped to the MCS), enabling the UE to receive the TB in the PDSCH with the target BLER (such as 10%). Therefore, the gNB needs to indicate the change in the CSI-RS transmission power to the UE so that the UE can correctly calculate the CSI report (such as CQI) or L1-RSRP.

[0117] When the serving gNB reduces the transmission power, the UE may experience beam failure and / or radio link failure. In addition, the UE may not be able to complete the beam switching or handover process. Therefore, it is necessary to identify the impact of the candidate power reduction on the beam / cell coverage to avoid possible CSI-RS and / or PDSCH power adjustments caused by beam and / or radio link failure.

[0118] Figure 12 A block diagram of an example method 1200 is shown that uses high-layer signaling to configure one or more network operation states and uses DCI indicating a network operation state index to trigger network state transitions. Figure 12 The embodiments of the illustrated method 1200 are for illustrative purposes only. Figure 12 They do not limit the scope of the present disclosure to any particular implementation of method 1200.

[0119] The network operation state is defined as a set of network operation parameters such that cell DTX / DRX, spatial domain adaptation, and power domain adaptation can be jointly configured. Multiple network operation states can be configured by high-layer signaling, and the state index can be indicated in the DCI.

[0120] The UE can be configured with a network operation state that combines adaptations from cell DTX / DRX, spatial domain solutions, and power domain solutions, as well as other future energy-saving enhancements. The following are examples of possible network operation state configurations: Example 1: The network operation state can be associated with the active / inactive periods of cell DTX / DRX, the applied power offset, and / or the active spatial elements; Example 2: The network operation state can be associated with one of a set of cell DTX / DRX configurations in multiple sets of configurations; Example 3: The network operation state can be associated with the activation or deactivation of cell DTX / DRX.

[0121] In method 1200, the UE obtains one or more network operation states from the serving cell via high-layer signaling (e.g., RRC) and receives DCI for triggering state transitions. For example, there can be 3 DTX states (along with the "on" state), each corresponding to a value of {on duration, offset, possible inactive timer} - 2 bits in the DCI are used to indicate one of the 3 DTX states (or the "on" state). In another example, there can be only one DTX configuration, and 1 bit in the DCI can indicate the activation or deactivation of this DTX configuration.

[0122] A search space set group indication can also be provided (e.g., the UE can switch to more / less frequent PDCCH monitoring).

[0123] In addition to indicating the network operation state index, the triggering of DCI can be enhanced in the following ways.

[0124] The DCI includes a timer value that is used to indicate the effective duration of the currently indicated network operation state. A default network operation state can be defined, and the UE switches to this default network operation state when the timer expires.

[0125] The DCI can use a single DCI to indicate a series of M network state indexes to the UE. The UE will undergo a series of M network state transitions. A default effective duration timer can be applied to all network operation states, a separate effective duration timer can be configured for each state using high-layer signaling, or a set of effective duration timer values can be indicated using the DCI together with the M indicated network operation states. The DCI indicating the effective duration timer can be an index selected from a set of candidate values configured via high-layer signaling.

[0126] The DCI can use a single DCI to indicate the network states of N cell groups / TRPs to the UE.

[0127] The DCI can indicate the index of the network state and the next PDCCH monitoring occasion for the state transition.

[0128] Figure 13 Figure 1300 showing antenna port adaptation is presented. Figure 13 The embodiment of the schematic diagram 1300 of the antenna port adaptation shown is for illustrative purposes only. Figure 13 It does not limit the scope of the present disclosure to the adaptation shown in schematic diagram 1300 or any specific implementation.

[0129] In another network energy saving method, as Figure 13 shown in the example in, the number of active antenna ports for DL transmission and reception at the gNB can be adapted. As the number of active antenna ports changes, the CSI report from the UE needs to be adjusted accordingly. In one example, the serving cell can provide the UE with multiple hypotheses about the possible antenna structures for adaptation in the CodebookConfig. In the example figure, for the Type-I SP case, the two-four-TypeI-SinglePanel-Restriction is configured for the first configuration, and the two-two-TypeI-SinglePanel-Restriction is configured for the second configuration.

[0130] For the CSI report, the UE assumes that the antenna structure is configured by RRC and calculates multiple CSIs and transmits them in one CSI report. The CSI report can be enhanced to reduce the payload size. Alternatively, the UE can be indicated by DCI (such as the DCI triggering the aperiodic CSI), indicating one or more antenna structure indices from a set of RRC-configured structures to derive the CSI.

[0131] Figure 14 Figure 1400 showing the use of DCI to trigger antenna port adaptation is presented. Figure 14 The embodiment of the schematic diagram 1400 shown is for illustrative purposes only. Figure 14 It does not limit the scope of the present disclosure to any specific implementation of schematic diagram 1400.

[0132] By defining the network operation state described by a set of network operation parameters, the spatial domain adaptation (including antenna ports, panels, TRPs, and / or transceiver chains) can be combined with the adaptation in other domains in a unified manner.

[0133] Table 1 below shows an exemplary flowchart for enhancing the RRC message to support antenna port adaptation. Table 1 is for illustrative purposes only and is not intended to limit the scope of the present disclosure to the specific implementation of the process shown in Table 1.

[0134] [Table 1]

[0135] Table 1 discloses an exemplary RRC message extension to allow for configuring multiple hypotheses regarding possible antenna port adaptation for the Type-I single-panel antenna case. The Type-II single-panel case can be exemplified similarly.

[0136] Figure 15 A block diagram 1500 of antenna panel adaptation is shown. Figure 15 The embodiment of the shown block diagram 1500 is for illustration only. Figure 15 It does not limit the scope of the present disclosure to any particular implementation of the antenna panel adaptation shown in the block diagram 1500.

[0137] For a UE supporting multi-panel antennas, the UE can be indicated by DCI (e.g., DCI for triggering aperiodic CSI) the number ng of active panels, ng can take values of {one, two, four}, and cannot be greater than the number of panels configured by RRC. In the CSI report, the UE only sends the in-phase feedback for the indicated number of active panels. When ng = 1 is indicated, it reverts to the single-panel (SP) case, and the CSI report does not include any in-phase feedback. In this case, the sub-configuration of the CSI report corresponding to the SP case can be associated with the Type-1 SP codebook, while within the same CSI report setting, the sub-configuration of another CSI report corresponding to the multi-panel (MP) case can be associated with the Type-1 MP codebook.

[0138] The present disclosure provides another network energy-saving method. In this method, the PDSCH transmission power level at the gNB can be adapted relative to the CSI-RS transmission power level. Since the actual transmission power of the PDSCH may be different from the measured CSI-RS, it is necessary to enhance the CSI report from the UE to notify the serving cell of the expected CSI at the adjusted actual transmission power. In one example, the serving cell can provide multiple powerControlOffset values for the UE in the CSI-RS resource configuration, that is, the offset of the PDSCH transmission power relative to the CSI-RS power.

[0139] For the CSI report, the UE assumes that the powerControlOffset value is configured by RRC, calculates multiple CSIs, and sends them in one CSI report. The CSI report can be enhanced to reduce the payload size. Alternatively, the UE can be indicated by DCI (e.g., DCI for triggering aperiodic CSI) to derive the CSI by indicating one or more powerControlOffset value indices from a set of RRC configuration structures. By defining the network operation state described by a set of network operation parameters, the spatial domain adaptation (including antenna ports, panels, TRPs, and / or transceiver chains) can be combined with the adaptation of other domains in a unified manner.

[0140] For Rel-18 NES UEs, multiple hypothesized powerControlOffset values are allowed to be configured. For CSI reporting, the UE calculates multiple CSIs and transmits them in one CSI report. Differential feedback can be defined for some CSI components (e.g., CQI) to reduce the CSI feedback payload size. Alternatively, the UE can be indicated by DCI (e.g., DCI for triggering aperiodic CSI) to derive CSI (e.g., using a bitmap) from one or more powerControlOffset value indices from a set of RRC configured values.

[0141] Table 2 presents an example procedure of enhanced RRC messages to support PDSCH power adaptation. Table 2 is an exemplary implementation of the above method.

[0142] [Table 2]

[0143] In an embodiment, as will be described in more detail below, the present disclosure provides and defines functions and procedures for adapting network operating states in the spatial domain or power domain. The present disclosure also provides a method and apparatus for a gNB to indicate a change in CSI-RS transmission power, and for a UE to calculate a CSI reporting quantity (e.g., CQI or L1-RSRP) based on CSI-RS by restricting measurement occasions, or by adjusting measurement values according to an indicated CSI-RS transmission power offset. The present disclosure also provides a method and apparatus for a gNB to indicate a hypothesized power offset value relative to the actual power of RLM-RS transmission to a UE, and for the UE to provide a hypothesized beam failure and / or hypothesized radio link failure (RLF) report for the indicated hypothesized power offset value.

[0144] The general principle of channel measurement enhancement includes the serving gNB indicating to the UE a change in CSI-RS transmission power and a transmission power offset through L1, MAC CE, or RRC information, and including the UE calculating CSI (such as L1-RSRP, CQI) by restricting measurement occasions (not later than the CSI reference resource but not earlier than the transmission power change indication) or by adjusting measurement values according to the indicated transmission power offset, and reporting the CSI of the serving cell to the serving gNB.

[0145] Figure 16 A flowchart of method 1600 is shown in which a UE receives an indication of a change / update in CSI-RS transmission power and a transmission power offset from a serving gNB, calculates CSI using measurement restrictions or adjustments, and provides a CSI report to the serving gNB according to the present disclosure.

[0146] At 1610, the UE obtains a CSI report configuration from the serving gNB via a higher layer. The CSI report configuration includes indications regarding CSI-RS resource sets and CSI report quantities. At 1620, the UE receives an indication of CSI-RS transmission power change and parameters related to transmission power offset from the serving gNB via L1, L2, or higher layer signaling. At 1630, the UE derives the CSI for the corresponding CSI-RS by restricting the measurement occasion to be no later than the CSI reference resource but no earlier than the indication of transmission power change, or by adjusting the measured value adjusted with the indicated power offset. At 1640, the UE sends a CSI report to the serving gNB that includes the CSI-RS resource index and the corresponding CSI report quantity.

[0147] For example, in CSI-ReportConfig , the UE can be instructed to enable time-domain restrictions for channel measurement. If timeRestrictionForChannelMeasureme nts in CSI-ReportConfig is set to "not configured", the UE shall derive the channel measurement for calculating the CSI value reported in uplink slot n based only on the SS / PBCH or NZP CSI-RS that is no later than the CSI reference resource associated with the CSI resource setting. If timeRestrictionF orChannelMeasurements in CSI-ReportConfig is set to "configured", the UE shall derive the channel measurement for calculating the CSI reported in uplink slot n based only on the most recent (no later than the CSI reference resource) occasion of the SS / PBCH or NZP CSI-RS associated with the CSI resource setting. The higher layer information can also provide a candidate set of CSI-RS transmission powers (e.g., in the form of timeRestrictionForChannelMeasurements ), or provide a set of values of ±Δ dB offset values indicated in the powerControlOffsetSS configuration. NZP-CSI-RS-Resource configuration. powerControlOffsetSS

[0148] Figure 17 FIG. 1700 shows a schematic diagram of an exemplary configuration of time-domain channel measurement restrictions. Figure 17 The embodiments of the schematic diagram 1700 shown are for illustrative purposes only. Figure 17 They do not limit the scope of the present disclosure to any particular implementation of the time-domain channel measurement restrictions shown in FIG. 1700.

[0149] As detailed above, at 1620, the UE receives an indication of CSI-RS transmission power change / update and parameters related to transmission power offset from the serving gNB via L1, MAC CE, or RRC information. This indication can be provided by a DCI format or by a PDSCH scheduled by a DCI format in the PDCCH reception according to a CSS set or USS set.

[0150] In one example, the UE receives an indication of the index of a CSI-RS resource set or the indices of multiple CSI-RS resources within the set from the serving gNB, and also receives an indication of the CSI-RS transmission power change provided by DCI and the corresponding CSI report configuration ID. The UE may also be indicated of parameters related to the transmission power offset for the indicated CSI-RS resource set or CSI-RS resources, for example, in the form of powerControlOffsetSS , or in the form of an offset value of powerControlOffsetSS , or in the form of an index of a set of candidate values provided by a higher layer in step 1610. The DCI may also indicate whether the indication of the CSI-RS transmission power change applies only to the next CSI-RS reference resource, or to a specified or indicated time period, or until the next indication of the CSI-RS transmission power change is received.

[0151] The UE may also be provided with a CSI calculation method. One method includes restricting CSI calculation to the nearest (not later than the CSI reference resource) occasion of SS / PBCH or NZP CSI-RS associated with the CSI resource setting regardless of CSI-ReportConfig in timeRe strictionForChannelMeasurements the configuration. Another method includes restricting CSI calculation to the measurement occasion (not later than the CSI reference resource but not earlier than the UE receives the indication of the CSI-RS transmission power change) of SS / PBCH or NZP CSI-RS associated with the CSI resource setting if CSI- ReportConfig in timeRestrictionForChannelMeasurements is set to "not configured". Yet another method includes calculating CSI based on SS / PBCH or NZP CSI-RS (not later than the CSI reference resource) associated with the CSI resource setting by adjusting the sample measurement of each RSRP value by the amount of the indicated power offset value before filtering the samples into a single measurement quantity.

[0152] Existing DCI formats (such as DCI format 0_1) may be extended to include additional fields to indicate those indices used to adjust the CSI-RS transmission power, or new DCI formats may be defined. The indication of the CSI-RS transmission power change may be provided by a DCI format specific to a UE group (provided by the PDCCH monitored by the UE according to the CSS set), the DCI format specific to the UE group may include an information block, and the UE obtains the start position of the block through a higher layer. The information provided to the UE in the block may include a large number of indices of multiple CSI reports.

[0153] In another example, the UE receives an indication of the index of the CSI-RS resource set or a large number of indices of multiple CSI-RS resources within the set, an indication of the CSI-RS transmission power change, and the corresponding CSI report configuration ID from the serving gNB via the PDSCH that provides the MAC-CE. The IE / fields transmitted via the MAC-CE message can be similar to those described for the DCI case. Existing MAC CE formats (e.g., the "SP CSI-RS / CSI-IM resource set activation / deactivation" MAC CE or the "SP CSI report activation / deactivation on PUCCH" MAC CE) can be extended to include additional fields to indicate these indices, or new MAC CE formats can be defined.

[0154] In yet another example, the serving gNB indicates to the UE, via a higher layer, the time-domain pattern of the CSI-RS transmission power change (e.g., in the form of a period and an offset) and the offset value relative to the indicated powerControlOffsetSS of powerControlOffsetSS The information indicated by the higher layer can also include information elements / fields similar to those described for the DCI case.

[0155] As detailed above, in 1630, the UE derives the L1 RSRP based on the corresponding CSI-RS by restricting the measurement occasion to be no later than the CSI reference resource and no earlier than the reception occasion of the CSI-RS transmission power change indication, or by adjusting the measurement according to the indicated power offset. According to this indication or based on pre-configured rules, the UE can limit the CSI calculation to be based on the most recent (no later than the CSI reference resource) occasion of the SS / PBCH or NZP CSI-RS associated with the CSI resource setting, regardless of CSI-ReportConfig in timeRestrictionForChannelMeasurements the configuration. If CSI- ReportConfig in timeRestrictionForChannelMeasurements is "not configured", the UE can limit the CSI calculation to be based on the measurement occasion (no later than the CSI reference resource and no earlier than the reception occasion of the CSI-RS transmission power change indication) of the SS / PBCH or NZP CSI-RS associated with the CSI resource setting to calculate the CSI, or the UE can calculate the CSI based on the SS / PBCH or NZP CSI-RS (no later than the CSI reference resource) associated with the CSI resource setting by adjusting the sample measurement of each RSRP value by the indicated power offset value before filtering the samples into a single measurement quantity.

[0156] As detailed above, in 1640, the UE provides a CSI report to the serving gNB that includes the CSI-RS resource index and the corresponding L1 RSRP.

[0157] In an embodiment of the present disclosure, the general principle of enhanced wireless link monitoring includes a serving gNB indicating to a UE a plurality of hypothetical power offset values relative to the actual power of RLM-RS transmissions, and receiving from the UE a hypothetical beam failure report (BFR) or a hypothetical radio link failure (RLF) report for the indicated hypothetical power offset values. Based on these BFR or RLF reports, the serving gNB can avoid potential CSI-RS or PDSCH power adjustments that may cause beam failure or RLF.

[0158] Figure 18 A flowchart of method 1800 for a UE to report hypothetical beam failures and / or hypothetical radio link failure reports is shown. In an embodiment, Figure 18 An example method is shown in which a UE receives a plurality of hypothetical power offset values relative to the actual power of RLM-RS transmissions and provides a hypothetical BFR or a hypothetical RLF report for the serving cell to the gNB according to the present disclosure. Figure 18 The embodiment of method 1800 shown is for illustrative purposes only. Figure 18 It does not limit the scope of the present disclosure to any particular implementation of method 1800.

[0159] At 1810, the UE obtains, via a higher layer, a radio link monitoring reference signal (RLM-RS) resource and one or more hypothetical power offset values relative to the actual power of RLM-RS transmissions from the serving gNB. At 1820, the UE derives one or more indications of hypothetical likelihoods of beam failure or radio link failure based on the one or more hypothetical power offset values provided by the serving gNB. At 1830, the UE sends a hypothetical beam failure and / or a hypothetical radio link failure report to the serving gNB based on the derived indications.

[0160] Figure 19 A schematic diagram 1900 showing an example of reduced cell / beam coverage due to transmission power adjustment is shown. Figure 19 The embodiment of the schematic diagram 1900 shown is for illustrative purposes only. Figure 19 It does not limit the scope of the present disclosure to any particular implementation.

[0161] The UE obtains radio link monitoring reference signal (RLM-RS) resources and multiple hypothetical power offset values relative to the actual power of RLM-RS transmission from the serving gNB through a higher layer. The serving gNB may provide the UE with a set of RLM-RS resources, which may include SSB, CSI-RS, or a combination of SSB and CSI-RS, where the purpose of each RLM-RS is indicated as being for beam failure detection, RLM, or both. For the RLM-RS resources, the UE may obtain multiple hypothetical power offset values relative to the actual power of RLM-RS transmission. For example, if the SSB is configured as an RLM-RS resource, the actual SSB transmission power is indicated by ServingCellConfigCommonSIB in ss-PDCH-BlockPower . The number of hypothetical power offset values may be set relative to the ss-PDCH-BlockPower value and indicated to the UE. As another example, if the CSI-RS is configured as an RLM-RS resource, the actual CSI-RS transmission power is indicated by NZP-CSI-RS-Resource in powerControlOffsetSS (relative to ss-PDCH-BlockPower ). One or more hypothetical power offset values may be set relative to the actual CSI-RS transmission power and indicated to the UE, and may be interpreted as a hypothetical CSI-RS transmission power or a hypothetical PDSCH transmission power relative to the CSI-RS transmission power, i.e., powerControlOffsetSS or powerControlOffset .

[0162] The gNB may indicate the hypothetical power offset values for each RLM-RS resource to the UE, or indicate that the indicated values can be applied to all configured RLM-RS resources, or indicate that multiple hypothetical power offset values can be applied to corresponding subsets of the RLM-RS resources, where the mapping may be indicated by a higher layer.

[0163] In another example, the serving gNB does not configure any reference signal as an RLM-RS and indicates multiple hypothetical power offset values. In this case, the RLM-RS is implicitly assumed to be the RS associated with the active TCI state of the CORESET that the UE receives for the PDCCH providing the DCI format, where the DCI format indicates the number of transmission power offsets, and the transmission power offsets are interpreted relative to the assumed RS.

[0164] Based on multiple hypothetical power offset values provided by the serving gNB at 1820, the UE derives multiple indications of hypothetical possibilities of beam failure or RLF. In one example, such an indication may be RSRP, RSRQ, or SINR. In another example, such an indication may be a hypothetical PDCCH BLER assuming certain PDCCH transmission parameters (e.g., DCI format 1_0 with a control channel element (CCE) aggregation level of 8 and a CORESET spanning 2 symbols). In another example, such an indication may be the occurrence of a hypothetical failure instance generated when the UE evaluates that the radio link quality of all monitored RLM-RSs is worse than a threshold when the indicated hypothetical power offset value is applied. The threshold may be set for RSRP, RSRQ, SINR, or a hypothetical PDCCH BLER assuming certain PDCCH transmission parameters.

[0165] Based on the derived indications at 1830, the UE reports a hypothetical beam failure or a hypothetical RLF to the serving gNB. In one example, the report includes all indications of hypothetical possibilities of beam failure or RLF calculated by the UE in step 1820 based on the power offset values provided by the serving gNB. In another example, the UE is provided by the serving gNB with a threshold for reporting the derived indications, such that the UE reports indications that are worse than the provided threshold and the corresponding RLM-RS index and / or hypothetical power offset index. The threshold may be set to RSRP, RSRQ, SINR, or a hypothetical PDCCH BLER based on an assumption of certain PDCCH transmission parameters. In yet another example, the UE provides a report only when the hypothetical failure instance as described above occurs and provides the corresponding RLM-RS index or hypothetical power offset index.

[0166] Any of the above variation embodiments can be used independently or in combination with at least one other variation embodiment.

[0167] The above flowcharts illustrate example methods that can be implemented in accordance with the principles of the present disclosure, and various changes can be made to the methods shown in the flowcharts herein. For example, although shown as a series of steps, the individual steps in each figure can overlap, occur in parallel, occur in a different order, or occur multiple times. In another example, steps can be omitted or replaced by other steps.

[0168] Although the drawings illustrate different examples of user equipment, various changes can be made to the drawings. For example, the user equipment can include any number of each component arranged in any suitable manner. Generally, the drawings do not limit the scope of the present disclosure to any particular configuration. In addition, although the drawings illustrate an operating environment in which various user equipment features disclosed in this patent document can be used, these features can be used in any other suitable system.

[0169] Although the present disclosure has been described in connection with exemplary embodiments, various changes and modifications can be proposed by those skilled in the art. The present disclosure is intended to cover such changes and modifications that fall within the scope of the appended claims. Any description in this application should not be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is defined by the claims.

Claims

1. A method performed by a user equipment UE in a wireless communication system, the method comprising: Receiving first information related to the reception of a reference signal RS, wherein the RS includes a channel state information RS CSI-RS or a synchronization signal, and wherein the RS is associated with at least one of beam failure BF detection, radio link failure RLF detection, or CSI reporting, Receiving second information related to a hypothetical adaptation of the transmission power of the RS, Receiving the RS based on the first information, Determining a reported quantity indicating hypothetical channel conditions based on the second information and the reception of the RS, and Transmitting a channel carrying the reported quantity indicating the hypothetical channel conditions.

2. The method according to claim 1, Among them, The second information includes an offset value of the actual transmission power of the RS, and Wherein, the offset value is sent by individual signaling and applied to the corresponding RS, or sent by common signaling and applied to all RSs related to the first information.

3. The method according to claim 1, wherein The reported quantity indicates information related to hypothetical BF or hypothetical RLF and includes at least one of the following: Reference signal received power RSRP, Reference signal received quality RSRQ, Signal-to-interference-plus-noise ratio SINR, or Block error rate BLER of the reception of a hypothetical physical downlink control channel PDCCH.

4. The method according to claim 1, wherein The reported quantity indicates that a BF instance or an RLF instance occurs under the hypothetical adaptation of the transmission power of the RS.

5. The method according to claim 1, further comprising: Receiving third information related to the determination of the reported quantity, the third information including one or more conditions for transmitting the reported quantity indicating hypothetical BF or hypothetical RLF, Wherein, transmitting the channel carrying the reported quantity further includes: when the hypothetical adaptation of the transmission power of the RS satisfies the one or more conditions, transmitting the channel carrying the reported quantity indicating hypothetical BF or hypothetical RLF.

6. A user equipment UE in a wireless communication system, the UE comprising: A transceiver, and A processor operably coupled to the transceiver, the processor configured to: Receive first information related to the reception of a reference signal RS, wherein the RS includes a channel state information RS CSI-RS or a synchronization signal, and wherein the RS is associated with beam failure BF detection, radio link failure RLF detection, or CSI reporting, Receive second information related to a hypothetical adaptation of the transmission power of the RS, Receive the RS based on the first information, and Determine a reported quantity indicating hypothetical channel conditions based on the second information and the reception of the RS, Wherein, the processor is further configured to transmit a channel carrying the reported quantity indicating the hypothetical channel conditions.

7. The UE according to claim 6, Among them, The second information includes an offset value of the actual transmission power of the RS, and Wherein, the offset value is sent by individual signaling and applied to the corresponding RS, or sent by common signaling and applied to all RSs related to the first information.

8. The UE according to claim 6, Among them, wherein the reported quantity indicates information related to hypothetical BF or hypothetical RLF, and includes at least one of the following: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), or Block Error Rate (BLER) of the received blocks of the hypothetical Physical Downlink Control Channel (PDCCH).

9. The UE according to claim 6, Among them, wherein the reported quantity indicates that a BF instance or an RLF instance occurs under the hypothetical adaptation of the transmission power of the RS.

10. The UE according to claim 6, wherein, The processor is further configured to: receive third information related to the determination of the reported quantity, the third information including one or more conditions for transmitting the reported quantity indicating hypothetical BF or hypothetical RLF, and transmit the channel carrying the reported quantity indicating hypothetical BF or hypothetical RLF when the hypothetical adaptation of the transmission power of the RS satisfies the one or more conditions.

11. A Base Station (BS) in a wireless communication system, the BS comprising: a transceiver, and a processor operably coupled to the transceiver, the processor configured to: transmit first information related to the reception of a Reference Signal (RS), wherein the RS includes Channel State Information - Reference Signal (CSI-RS) or a synchronization signal, and wherein the RS is associated with Beam Failure (BF) detection, Radio Link Failure (RLF) detection, or CSI reporting, transmit second information related to the hypothetical adaptation of the transmission power of the RS, transmit the RS based on the first information, and receive the channel carrying the reported quantity indicating hypothetical channel conditions, the reported quantity being based on the second information and the RS.

12. The BS according to claim 11, Among them, wherein the second information includes an offset value of the actual transmission power of the RS, and wherein the offset value is sent by separate signaling and applied to the corresponding RS, or sent by common signaling and applied to all RSs related to the first information.

13. The BS according to claim 11, Among them, wherein the reported quantity indicates information related to hypothetical BF or hypothetical RLF, and includes at least one of the following: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), or Block Error Rate (BLER) of the received blocks of the hypothetical Physical Downlink Control Channel (PDCCH).

14. The BS according to claim 11, wherein The transceiver is further configured to: transmit third information related to the determination of the reported quantity, the third information including one or more conditions for transmitting the reported quantity indicating hypothetical BF or hypothetical RLF, and receive the channel carrying the reported quantity indicating hypothetical BF or hypothetical RLF when the hypothetical adaptation of the transmission power of the RS satisfies the one or more conditions.

15. A method performed by a Base Station (BS) in a wireless communication system, the method comprising: Transmit first information related to the reception of a reference signal RS, where the RS includes channel state information RS CSI-RS or a synchronization signal, and where the RS is associated with beam failure BF detection, radio link failure RLF detection, or CSI reporting; Transmit second information related to a hypothetical adaptation of the transmission power of the RS; Transmit the RS based on the first information; And Receive a channel carrying a reported quantity indicating hypothetical channel conditions, the reported quantity being based on the second information and the RS.

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