Method and apparatus for transmitting and receiving aperiodic reference signals

Abstract

A method for operating a user equipment (UE) to perform aperiodic channel state information reference signal (CSI-RS) reception includes: receiving aperiodic CSI-RS configuration information including a CSI-RS triggering offset; receiving downlink control information (DCI) via a physical downlink control channel (PDCCH), wherein the DCI triggers the aperiodic CSI-RS; and determining the CSI-RS triggering offset based on the CSI-RS configuration information, wherein when μ PDCCH <μ CSIRS When the CSI-RS triggering offset is configured according to the first set, and when μ PDCCH >μ CSIRS When the CSI-RS triggering offset is configured according to the second set, μ PDCCH and μ CSIRS The subcarrier spacing configurations for PDCCH and aperiodic CSI-RS are used respectively, and based on CSI-RS trigger offset, time slot containing triggered DCI and subcarrier spacing configuration (μ PDCCH and μ CSIRS ) determined by the time slot K s Aperiodic CSI-RS is received in the

Description

Technical Field

[0001] The present disclosure relates generally to wireless communication systems, and more particularly to aperiodic reference signal reception and transmission in wireless communication systems. Background Art

[0002] In order to meet the demand for wireless data services that has increased since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". The 5G communication system is considered to be implemented in a higher frequency band (mmWave), for example, in a 60GHz frequency band, thereby achieving a higher data rate. In order 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, and massive antenna technology are discussed in the 5G communication system. In addition, in the 5G communication system, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM), as well as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet—a human-centric network of connectivity where humans generate and consume information—is now evolving into the Internet of Things (IoT), in which distributed entities such as things exchange and process information without human intervention. The Internet of Everything (IoE), a combination of IoT technologies and big data processing technologies through connectivity to cloud servers, has emerged. Since IoT implementation requires technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC) have recently been researched. This IoT environment can provide intelligent internet technology services that create new value for human life by collecting and analyzing data generated between connected things. The IoT can be applied to a variety of fields, including smart homes, smart buildings, smart cities, smart cars or connected vehicles, smart grids, healthcare, smart instruments, and advanced medical services, by integrating and combining existing information technology (IT) and various industrial applications.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. The application of cloud radio access networks (RAN), which are the aforementioned big data processing technologies, can also be considered an example of the convergence between 5G and IoT technologies.

[0005] Understanding and correctly estimating the channel between a user equipment (UE) and a base station (BS), such as a gNode B (gNB), is crucial for efficient and effective wireless communications. To accurately estimate the downlink (DL) channel conditions, the gNB can send a reference signal (e.g., a CSI-RS) to the UE for DL ​​channel measurement, and the UE can report (e.g., feed back) information about the channel measurement (e.g., CSI) to the gNB. This DL channel measurement enables the gNB to select appropriate communication parameters to efficiently and effectively perform wireless data communications with the UE. Summary of the Invention

[0006] Technical issues

[0007] The aperiodic reference signal transmission and reception process needs to be enhanced for accurate channel estimation.

[0008] Problem Solution

[0009] Embodiments of the present disclosure provide a method and apparatus for enabling aperiodic reference signal reception / transmission in a wireless communication system.

[0010] In one embodiment, a UE for aperiodic channel state information reference signal (CSI-RS) reception is provided. The UE includes a transceiver configured to: receive aperiodic CSI-RS configuration information including a CSI-RS triggering offset, and receive downlink control information (DCI) via a physical downlink control channel (PDCCH), wherein the DCI triggers the aperiodic CSI-RS. The UE also includes a processor operably connected to the transceiver. The processor is configured to determine the CSI-RS triggering offset based on the CSI-RS configuration information, wherein: when μ PDCCH <μ CSIRS When the CSI-RS trigger offset is configured according to the first set, and when μ PDCCH >μ CSIRS When the CSI-RS triggering offset is configured according to the second set, where μ PDCCH and μ CSIRS are the subcarrier spacing configurations of PDCCH and aperiodic CSI-RS, respectively, and wherein the transceiver is further configured to trigger DCI based on the CSI-RS trigger offset, the time slot containing the trigger DCI, and the subcarrier spacing configuration (μ PDCCHand μ CSIRS ) Determined time slot K s Receive aperiodic CSI-RS.

[0011] In another embodiment, a base station (BS) in a wireless communication system is provided. The BS includes a processor configured to generate aperiodic channel state information reference signal (CSI-RS) configuration information and downlink control information (DCI). The BS also includes a transceiver operably coupled to the processor. The transceiver is configured to: send aperiodic CSI-RS configuration information including a CSI-RS triggering offset; send DCI via a physical downlink control channel (PDCCH), wherein the DCI triggers the aperiodic CSI-RS; and s Aperiodic CSI-RS is sent in PDCCH <μ CSIRS When the CSI-RS trigger offset is configured according to the first set, and when μ PDCCH >μ CSIRS When CSI-RS triggering offset is configured according to the second set, μ PDCCH and μ CSIRS are the subcarrier spacing configurations for PDCCH and aperiodic CSI-RS, and the time slot K s It is based on the CSI-RS trigger offset, the time slot containing the triggered DCI and the subcarrier spacing configuration (μ PDCCH and μ CSIRS ) confirmed.

[0012] In yet another embodiment, a method for operating a UE to perform aperiodic channel state information reference signal (CSI-RS) reception is provided. The method includes: receiving aperiodic CSI-RS configuration information including a CSI-RS triggering offset; receiving downlink control information (DCI) via a physical downlink control channel (PDCCH), wherein the DCI triggers the aperiodic CSI-RS; and determining the CSI-RS triggering offset based on the CSI-RS configuration information, wherein: when μ PDCCH <μ CSIRS When the CSI-RS trigger offset is configured according to the first set, and when μ PDCCH >μ CSIRS When the CSI-RS triggering offset is configured according to the second set, where μ PDCCH and μ CSIRS They are the subcarrier spacing configurations of PDCCH and aperiodic CSI-RS respectively; and based on CSI-RS trigger offset, time slot containing triggered DCI and subcarrier spacing configuration (μ PDCCH and μ CSIRS ) Determined time slot K sReceive aperiodic CSI-RS.

[0013] Other technical features can be easily understood by those skilled in the art from the following drawings, description and claims.

[0014] Before proceeding to the detailed description below, it may be helpful to clarify the definitions of certain words and phrases used in this patent document. The term "coupled" and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether those elements are in physical contact with each other. The terms "send," "receive," and "communicate," and their derivatives, encompass both direct and indirect communication. The terms "include," "comprise," and their derivatives, mean to include, but are not limited to. The term "or" is inclusive, meaning and / or. The phrase "associated with" and its derivatives mean to include, be included within, be interconnected with, contain, be contained within, be connected to or connected with, be coupled to or coupled with, be communicable with, collaborate with, be interwoven, be juxtaposed, be in proximity to, be bound to or bound with, have, have the properties of, have a relationship with, or have a relationship with, etc. The term "controller" refers to any device, system, or portion thereof that controls at least one operation. Such a controller may be implemented using hardware or a combination of hardware and software and / or firmware. The functionality associated with any particular controller may be centralized or distributed, whether local or remote. When used with a list of items, the phrase "at least one of" means that different combinations of one or more of the listed items can be used, and only one item in the list may be needed. 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.

[0015] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed of a computer-readable program code and implemented in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data, or parts thereof that are suitable for implementation in a suitable 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 type of medium that can be accessed by a computer, such as a read-only memory (ROM), random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store data and overwrite it later, such as rewritable optical discs or erasable memory devices.

[0016] Definitions for certain other words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most, instances, such definitions apply to prior and future uses of such defined words and phrases.

[0017] Advantageous Effects of the Invention

[0018] According to various embodiments of the present disclosure, the channel estimation process can be enhanced accurately and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description in conjunction with the accompanying drawings, in which like reference numerals represent like parts:

[0020] Figure 1 illustrates an example wireless network according to an embodiment of the present disclosure;

[0021] Figure 2 An example gNB according to an embodiment of the present disclosure is illustrated;

[0022] Figure 3 An example UE according to an embodiment of the present disclosure is illustrated;

[0023] FIG4A illustrates a high-level diagram of an OFDMA transmission path according to an embodiment of the present disclosure;

[0024] FIG4B illustrates a high-level diagram of an OFDMA receive path according to an embodiment of the present disclosure;

[0025] Figure 5A transmitter block diagram of a PDSCH in a subframe according to an embodiment of the present disclosure is illustrated;

[0026] Figure 6 A receiver block diagram of a PDSCH in a subframe according to an embodiment of the present disclosure is illustrated;

[0027] Figure 7 A block diagram of a transmitter of a PUSCH in a subframe according to an embodiment of the present disclosure is illustrated;

[0028] Figure 8 A receiver block diagram of a PUSCH in a subframe according to an embodiment of the present disclosure is illustrated;

[0029] Figure 9 illustrates an example antenna frame according to an embodiment of the present disclosure;

[0030] Figure 10 Illustrated are aperiodic CSI-RS measurement and aperiodic CSI reporting operations according to an embodiment of the present disclosure;

[0031] Figure 11 A method of an uplink transmission scheme based on partial reciprocity according to an embodiment of the present disclosure is illustrated;

[0032] Figure 12 Another method of an uplink transmission scheme based on partial reciprocity according to an embodiment of the present disclosure is illustrated;

[0033] Figure 13 Another method of an uplink transmission scheme based on partial reciprocity according to an embodiment of the present disclosure is illustrated;

[0034] Figure 14 FIG2 illustrates another method of an uplink transmission scheme based on partial reciprocity according to an embodiment of the present disclosure;

[0035] Figure 15 illustrates a flow chart of a method for operating a user equipment (UE) for aperiodic channel state information reference signal (CSI-RS) reception as may be performed by the UE according to an embodiment of the present disclosure;

[0036] Figure 16 Illustrated is a flowchart of another method for aperiodic channel state information reference signal (CSI-RS) transmission as may be performed by a BS according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] Invention Mode

[0038] Discussed below Figures 1 to 16The various embodiments used to describe the principles of the present disclosure in this patent document are for illustration only and should not be interpreted 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 suitably arranged system or device.

[0039] The following documents and standard descriptions are hereby incorporated by reference into the present disclosure as if fully set forth herein: 3GPP TS 36.211 v16.1.0, "E-UTRA, Physical Channels and Modulation"; 3GPP TS 36.212 v16.1.0, "E-UTRA, Multiplexing and Channel Coding"; 3GPP TS 36.213 v16.1.0, "E-UTRA, Physical Layer Procedures"; 3GPP TS 36.321 v16.1.0, "E-UTRA, Medium Access Control (MAC) Protocol Specification"; 3GPP TS 36.331 v16.1.0, "E-UTRA, Radio Resource Control (RRC) Protocol Specification"; 3GPP TR 22.891 v14.2.0; 3GPP TS 38.211 v16.1.0, "E-UTRA, NR, Physical Channels and Modulation"; 3GPP TS 3GPP TS 38.213 v16.1.0, “E-UTRA, NR, Physical layer control procedures”; 3GPP TS 38.214 v16.1.0, “E-UTRA, NR, Physical layer procedures for data”; and 3GPP TS 38.212 v16.1.0, “E-UTRA, NR, Multiplexing and channel coding”.

[0040] The aspects, features, and advantages of the present disclosure will be readily apparent from the following detailed description, which simply illustrates a number of specific embodiments and implementations, including the best mode contemplated for practicing the present disclosure. The present disclosure is also capable of other different embodiments, and its several details may be modified in various obvious respects without departing from the spirit and scope of the present disclosure. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive. The present disclosure is illustrated by way of example and not limitation in the figures of the accompanying drawings.

[0041] In the following, for simplicity, both FDD and TDD are considered as duplexing methods for both DL and UL signaling.

[0042] Although the following exemplary description and embodiments assume orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA), the present disclosure may be extended to other OFDM-based transmit waveforms or multiple access schemes, such as filtered OFDM (F-OFDM).

[0043] To meet the growing demand for wireless data traffic since the deployment of 4G communication systems, improved 5G or pre-5G communication systems have been developed. Therefore, 5G or pre-5G communication systems are also called "beyond 4G networks" or "post-LTE systems."

[0044] 5G communication systems are expected to be implemented in higher frequency (mmWave) bands (e.g., the 60 GHz band), enabling higher data rates. To reduce radio wave propagation losses and increase transmission coverage, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technologies are being discussed in 5G communication systems.

[0045] In addition, in 5G communication systems, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul communication, mobile networks, collaborative communications, coordinated multi-point (CoMP) transmission and reception, interference mitigation and cancellation, etc.

[0046] In 5G systems, hybrid frequency shift keying and quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as adaptive modulation and coding (AMC) technologies, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0047] The following Figure 1 4B describe various embodiments implemented by using an Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication technology in a wireless communication system. Figures 1 to 3 The description is not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably arranged communication system. The present disclosure encompasses multiple components that may be used in conjunction or combination with one another, or may operate as standalone solutions.

[0048] Figure 1 An example wireless network according to an embodiment of the present disclosure is illustrated. Figure 1 The embodiment of the wireless network shown is for illustration only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.

[0049] like Figure 1As shown, the wireless network includes gNB 101, 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).

[0050] gNB 102 provides wireless broadband access to network 130 for a first plurality of user equipment (UEs) within gNB 102's coverage area 120. The first plurality of UEs includes: UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); and UE 116, which may be a mobile device (M) such as a cellular phone, wireless laptop, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within gNB 103's coverage area 125. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of gNBs 101-103 may communicate with each other and with UEs 111-116 using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.

[0051] 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 base station (gNB), a macro cell, a femto cell, a WiFi access point (AP), or other wireless enabling devices. A base station can provide wireless access according to one or more wireless communication protocols, such as 5G 3GPP New Radio Interface / Access (NR), Long Term Evolution (LTE), Advanced LTE (LTE-A), High Speed ​​Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, the terms "BS" and "TRP" are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. In addition, depending on the network type, the term "user equipment" or "UE" can refer to any component such as a "mobile station," "subscriber 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 a remote wireless device that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (such as a desktop computer or vending machine).

[0052] Dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with gNBs, such as coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstacles.

[0053] As described in greater detail below, one or more of UEs 111-116 include circuitry, procedures, or a combination thereof for receiving aperiodic CSI-RS to determine and report CSI for communications in a wireless communication system. In certain embodiments, one or more of gNBs 101-103 include circuitry, procedures, or a combination thereof for transmitting aperiodic CSI-RS to acquire CSI in a wireless communication system.

[0054] although Figure 1 The diagram shows an example of a wireless network, but can be used for Figure 1 Various changes may be made. For example, the wireless network may include any number of gNBs and any number of UEs in any suitable arrangement. Furthermore, gNB 101 may communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 may communicate directly with network 130 and provide the UEs with direct wireless broadband access to network 130. Furthermore, gNBs 101, 102, and / or 103 may provide access to other or additional external networks, such as an external telephone network or other type of data network.

[0055] Figure 2 An example gNB 102 according to an embodiment of the present disclosure is illustrated. Figure 2 The embodiment of the gNB 102 shown in FIGURE 1 is for illustration only, and Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs come in a variety of configurations, and Figure 2 The scope of this disclosure is not limited to any particular implementation of a gNB.

[0056] like Figure 2 As shown, gNB 102 includes multiple antennas 205a-205n, multiple RF transceivers 210a-210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. gNB 102 also includes a controller / processor 225, memory 230, and a backhaul or network interface 235.

[0057] RF transceivers 210a-210n receive input RF signals from antennas 205a-205n, such as signals transmitted by UEs in network 100. RF transceivers 210a-210n down-convert the input RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 220, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 220 sends the processed baseband signals to controller / processor 225 for further processing.

[0058] The TX processing circuitry 215 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 225. The TX processing circuitry 215 encodes, multiplexes, and / or digitizes the output baseband data to generate processed baseband or IF signals. The RF transceivers 210a-210n receive the output processed baseband or IF signals from the TX processing circuitry 215 and up-convert the baseband or IF signals into RF signals that are transmitted via the antennas 205a-205n.

[0059] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 225 may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceivers 210a-210n, the RX processing circuitry 220, and the TX processing circuitry 215 in accordance with well-known principles. The controller / processor 225 may also support additional functionality, such as more advanced wireless communication functionality.

[0060] For example, the controller / processor 225 may support beamforming or directional routing operations, in which the output signals from the multiple antennas 205a-205n are weighted differently to effectively steer the output signals in a desired direction. The controller / processor 225 may also support any of a variety of other functions within the gNB 102.

[0061] The controller / processor 225 is also capable of executing programs and other processes, such as the OS, that reside in the memory 230. The controller / processor 225 can move data into or out of the memory 230 as required by the executing processes.

[0062] 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 over a backhaul connection or over a network. The interface 235 may support communication over any suitable wired or wireless connection(s). 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 over 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 over a wired or wireless local area network or over a wired or wireless connection to a larger network (such as the Internet). The interface 235 includes any suitable structure that supports communication over a wired or wireless connection (such as Ethernet or an RF transceiver).

[0063] 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.

[0064] although Figure 2 An example of a gNB 102 is shown, but may be Figure 2 For example, gNB 102 may include any number of Figure 2 As a specific example, the access point may include multiple interfaces 235, and the controller / processor 225 may support routing functionality to route data between different network addresses. As another specific example, although shown as including a single instance of the TX processing circuitry 215 and a single instance of the RX processing circuitry 220, the gNB 102 may include multiple instances of each processing circuitry (e.g., one processing circuitry per RF transceiver). In addition, Figure 2 The various components in can be combined, further subdivided, or omitted, and additional components can be added according to specific needs.

[0065] Figure 3 An example UE 116 is illustrated according to an embodiment of the present disclosure. Figure 3 The embodiment of UE 116 shown in FIGURE 1 is for illustration only, and Figure 1 UEs 111-115 may have the same or similar configurations. However, UEs have various configurations, and Figure 3 The scope of this disclosure is not limited to any particular implementation of a UE.

[0066] like Figure 3As shown, UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a TX processing circuit 315, a microphone 320, and a receive (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor 340, an input / output (I / O) interface (IF) 345, a touch screen 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0067] RF transceiver 310 receives an incoming RF signal from antenna 305, transmitted by a gNB of network 100. RF transceiver 310 downconverts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 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).

[0068] The TX processing circuit 315 receives analog or digital voice data from the microphone 320 or other output baseband data (such as network data, email, 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 up-converts the baseband or IF signal into an RF signal that is transmitted via the antenna 305.

[0069] The processor 340 may include one or more processors or other processing devices and executes the OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor 340 may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0070] Processor 340 is also capable of executing other processes and programs residing in memory 360, such as processes for CSI-RS measurement and CSI feedback on uplink channels. Processor 340 can move data into or out of memory 360 as required by the executed processes. In some embodiments, processor 340 is configured to execute application 362 based on OS 361 or in response to signals received from a gNB or operator. Processor 340 is also coupled to I / O interface 345, which provides UE 116 with the ability to connect to other devices such as laptops and handheld computers. I / O interface 345 is the communication path between these accessories and processor 340.

[0071] Processor 340 is also coupled to touch screen 350 and display 355. An operator of UE 116 may use touch screen 350 to enter data into UE 116. Display 355 may be a liquid crystal display, light emitting diode display, or other display capable of rendering text and / or at least limited graphics, such as from a website.

[0072] Memory 360 is coupled to processor 340. A portion of memory 360 may include random access memory (RAM), and another portion of memory 360 may include flash memory or other read-only memory (ROM).

[0073] although Figure 3 An example of a UE 116 is shown, but the Figure 3 Make various changes. For example, you can combine, further subdivide or omit Figure 3 As a specific example, the processor 340 may 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 The UE 116 is illustrated as being configured as a mobile phone or smartphone, but the UE may be configured to operate as other types of mobile or stationary devices.

[0074] FIG4A is a high-level diagram of a transmit path circuit. For example, the transmit path circuit may be used for orthogonal frequency division multiple access (OFDMA) communications. FIG4B is a high-level diagram of a receive path circuit. For example, the receive path circuit may be used for orthogonal frequency division multiple access (OFDMA) communications. In FIG4A and 4B , for downlink communications, the transmit path circuit may be implemented in a base station (gNB) 102 or a relay station, and the receive path circuit may be implemented in a user equipment (e.g., Figure 1 In other examples, for uplink communications, the receive path circuit 450 may be implemented in a base station (e.g., Figure 1The transmission path circuit may be implemented in a user equipment (e.g., gNB 102) or a relay station, and the transmission path circuit may be implemented in a user equipment (e.g., Figure 1 is implemented in the user device 116).

[0075] The transmit path circuitry includes a channel coding and modulation block 405, a serial-to-parallel (S-to-P) block 410, an inverse fast Fourier transform (IFFT) of size N, a parallel-to-serial (P-to-S) block 420, an add cyclic prefix block 425, and an upconverter (UC) 430. The receive path circuitry 450 includes a downconverter (DC) 455, a remove cyclic prefix block 460, a serial-to-parallel (S-to-P) block 465, a fast Fourier transform (FFT) of size N, a parallel-to-serial (P-to-S) block 475, and a channel decoding and demodulation block 480.

[0076] At least some of the components in FIG. 4A 400 and FIG. 4B 450 may be implemented in software, while other components may be implemented in a mixture of software and configurable hardware or in configurable hardware. In particular, it is noted that the FFT block and IFFT block described in this disclosure document may be implemented as configurable software algorithms, wherein the value of size N may be modified depending on the implementation.

[0077] In addition, although the present disclosure is directed to embodiments for realizing fast Fourier transform and inverse fast Fourier transform, this is only for illustration and cannot be interpreted as limiting the scope of the present disclosure. It will be appreciated that in alternative embodiments of the present disclosure, the fast Fourier transform function and the inverse fast Fourier transform function can be easily replaced by discrete Fourier transform (DFT) function and inverse discrete Fourier transform (IDFT) function, respectively. It will be appreciated that for DFT and IDFT functions, the value of the N variable can be any integer (i.e., 1, 4, 3, 4, etc.), while for FFT and IFFT functions, the value of the N variable can be any integer of a power of 2 (i.e., 1, 2, 4, 8, 16, etc.).

[0078] In transmit path circuitry 400, channel coding and modulation block 405 receives a set of information bits and applies coding (e.g., LDPC coding) and modulation (e.g., quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to the input bits to produce a sequence of frequency-domain modulation symbols. Serial-to-parallel block 410 converts (i.e., demultiplexes) the serial modulation symbols into parallel data to produce N parallel symbol streams, where N is the IFFT / FFT size used in BS 102 and UE 116. Size-N IFFT block 415 then performs an IFFT operation on the N parallel symbol streams to produce a time-domain output signal. Parallel-to-serial block 420 converts (i.e., multiplexes) the parallel time-domain output symbols from Size-N IFFT block 415 to produce a serial time-domain signal. Add cyclic prefix block 425 then inserts a cyclic prefix into the time-domain signal. Finally, upconverter 430 modulates (i.e., upconverts) the output of Add cyclic prefix block 425 to RF frequency for transmission via a wireless channel. The signal may also be filtered at baseband before conversion to RF frequency.

[0079] After passing through the wireless channel, the transmitted RF signal reaches UE 116, where operations reverse those at gNB 102 are performed. Downconverter 455 downconverts the received signal to baseband frequency, and remove cyclic prefix block 460 removes the cyclic prefix to produce a serial time-domain baseband signal. Serial-to-parallel block 465 converts the time-domain baseband signal into parallel time-domain signals. Size-N FFT block 470 then performs an FFT algorithm to produce N parallel frequency-domain signals. Parallel-to-serial block 475 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 480 demodulates and then decodes the modulated symbols to recover the original input data stream.

[0080] Each of gNBs 101-103 may implement a transmit path similar to that used for transmitting in the downlink to user equipments 111-116 and may implement a receive path similar to that used for receiving in the uplink from user equipments 111-116. Similarly, each of user equipments 111-116 may implement a transmit path corresponding to the architecture used for transmitting in the uplink to gNBs 101-103 and may implement a receive path corresponding to the architecture used for receiving in the downlink from gNBs 101-103.

[0081] 5G communication system use cases have been identified and described. These use cases can be roughly categorized into three different groups. In one example, enhanced mobile broadband (eMBB) is identified as being accomplished with higher bit / second requirements and less stringent latency and reliability requirements. In another example, ultra-reliable and low latency (URLL) is identified with less stringent bit / second requirements. In yet another example, massive machine type communication (mMTC) is identified as being where the number of devices can be as high as 100,000 to 1 million per square kilometer (km2), but the reliability / throughput / latency requirements may be less stringent. This scenario may also involve power efficiency requirements, as battery consumption can be minimized as much as possible.

[0082] Communication systems include a downlink (DL) and an uplink (UL). The downlink carries signals from a transmission point, such as a base station (BS) or NodeB, to a user equipment (UE). The uplink carries signals from a UE to a reception point, such as a NodeB. A UE, also commonly referred to as a terminal or mobile station, can be fixed or mobile and can be a cellular phone, personal computer, or automated device. An eNodeB (typically a fixed station) may also be referred to as an access point or other equivalent terminology. For LTE systems, a NodeB is often referred to as an eNodeB.

[0083] In communication systems such as LTE, downlink signals may include data signals conveying information content, control signals conveying downlink control information (DCI), and reference signals (RS), also known as pilot signals. The eNodeB transmits data information via the physical downlink shared channel (PDSCH). The eNodeB transmits DCI via the physical downlink control channel (PDCCH) or enhanced PDCCH (EPDCCH).

[0084] The eNodeB sends acknowledgment information in response to the transmission of a data transport block (TB) from the UE in the Physical Hybrid ARQ Indicator Channel (PHICH). The eNodeB sends one or more types of RS, including UE common RS (CRS), channel state information RS (CSI-RS), or demodulation RS (DMRS). CRS is sent over the DL system bandwidth (BW) and can be used by the UE to obtain channel estimates to demodulate data or control information or to perform measurements. In order to reduce CRS overhead, the eNodeB can send CSI-RS with a smaller density than CRS in the time domain and / or frequency domain. DMRS can only be sent in the BW of the corresponding PDSCH or EPDCCH, and the UE can use DMRS to demodulate the data or control information in the PDSCH or EPDCCH, respectively. The transmission time interval of a DL channel is called a subframe and can have a duration of, for example, 1 millisecond.

[0085] DL signals also include the transmission of logical channels that carry system control information. When the DL signal conveys the Master Information Block (MIB), the BCCH is mapped to a transport channel called the Broadcast Channel (BCH), or when the DL signal conveys the System Information Block (SIB), the BCCH is mapped to the DL Shared Channel (DL-SCH). Most system information is contained in different SIBs that are transmitted using the DL-SCH. The presence of system information on the DL-SCH in a subframe can be indicated by the transmission of the corresponding PDCCH, which conveys a codeword with a cyclic redundancy check (CRC) scrambled with the system information RNTI (SI-RNTI). Alternatively, scheduling information for SIB transmission can be provided in an earlier SIB and scheduling information for the first SIB (SIB-1) can be provided by the MIB.

[0086] DL resource allocation is performed in units of physical resource blocks (PRBs) and subframes. The transmission BW consists of frequency resource units called resource blocks (RBs). Each RB consists of The unit of a RB in a subframe is called a PRB. A total of 12 subcarriers or resource elements (REs) can be allocated to a UE for PDSCH transmission. M of RE PDSCH RBs.

[0087] UL signals may include data signals conveying data information, control signals conveying UL control information (UCI), and UL RSs. UL RSs include DMRSs and sounding RSs (SRSs). The UE sends DMRSs only in the BW of the corresponding PUSCH or PUCCH. The eNodeB may use DMRSs to demodulate data signals or UCI signals. The UE sends SRSs to provide UL CSI to the eNodeB. The UE sends data information or UCI through the corresponding physical UL shared channel (PUSCH) or physical UL control channel (PUCCH). If the UE needs to send data information and UCI in the same UL subframe, the UE may multiplex both in the PUSCH. UCI includes hybrid automatic repeat request acknowledgment (HARQ-ACK) information, scheduling request (SR), rank indicator (RI), and channel state information (CSI). HARQ-ACK information indicates correct (ACK) or incorrect (NACK) detection of the data TB in the PDSCH or no PDCCH detection (DTX). SR indicates whether the UE has data in the UE's buffer. The CSI enables the eNodeB to perform link adaptation for PDSCH transmissions to the UE.HARQ-ACK information is also sent by the UE in response to detection of the PDCCH / EPDCCH indicating the release of a semi-persistently scheduled PDSCH.

[0088] The UL subframe consists of two time slots. Each time slot includes a time slot for sending data information, UCI, DMRS or SRS. symbols. The frequency resource unit of UL system BW is RB. The UE is allocated a total of N of REs RB RBs. For PUCCH, N RB = 1. The last subframe symbol can be used to multiplex SRS transmissions from one or more UEs. The number of subframe symbols that can be used for data / UCI / DMRS transmission is If the last subframe symbol is used to send SRS, then N SRS =1, otherwise N SRS =0.

[0089] Figure 5 A transmitter block diagram 500 of a PDSCH in a subframe according to an embodiment of the present disclosure is illustrated. Figure 5 The embodiment of transmitter block diagram 500 shown in FIGURE 5 is for illustration only. Figure 5 One or more of the components shown in the can be implemented in dedicated circuits configured to perform the functions described, or one or more components can be implemented by one or more processors executing instructions to perform the functions described. Figure 5 The scope of this disclosure is not limited to any particular implementation of transmitter block diagram 500 .

[0090] like Figure 5 As shown, information bits 510 are encoded by an encoder 520 (e.g., a turbo (turbo) encoder) and modulated by a modulator 530, for example, using quadrature phase shift keying (QPSK) modulation. A serial-to-parallel (S / P) converter 540 generates M modulation symbols, which are then provided to a mapper 550 for mapping to REs selected by a transmit BW selection unit 555 for the assigned PDSCH transmit BW. Unit 560 applies an inverse fast Fourier transform (IFFT), and the output is then serialized by a parallel-to-serial (P / S) converter 570 to create a time-domain signal. Filtering is applied by a filter 580, and the signal is transmitted to a transmit 590. Additional functions, such as data scrambling, cyclic prefix insertion, time windowing, interleaving, and other functions are well known in the art and are not shown for the sake of brevity.

[0091] Figure 6 A receiver block diagram 600 of a PDSCH in a subframe according to an embodiment of the present disclosure is illustrated. Figure 6 The embodiment of diagram 600 shown is for illustration only. Figure 6One or more of the components shown in the can be implemented in dedicated circuits configured to perform the functions described, or one or more components can be implemented by one or more processors executing instructions to perform the functions described. Figure 6 The scope of this disclosure is not limited to any particular implementation of diagram 600 .

[0092] like Figure 6 As shown, a received signal 610 is filtered by a filter 620, REs 630 for the assigned receive BW are selected by a BW selector 635, a fast Fourier transform (FFT) is applied by a unit 640, and the output is serialized by a parallel-to-serial converter 650. A demodulator 660 then coherently demodulates the data symbols by applying a channel estimate obtained from a DMRS or CRS (not shown), and a decoder 670 (such as a turbo decoder) decodes the demodulated data to provide estimates of information data bits 680. For the sake of brevity, additional functionality such as time windowing, cyclic prefix removal, descrambling, channel estimation, and deinterleaving is not shown.

[0093] Figure 7 A transmitter block diagram 700 of a PUSCH in a subframe according to an embodiment of the present disclosure is illustrated. Figure 7 The illustrated embodiment of block diagram 700 is for illustration only. Figure 5 One or more of the components shown in the can be implemented in dedicated circuits configured to perform the functions described, or one or more components can be implemented by one or more processors executing instructions to perform the functions described. Figure 7 The scope of the present disclosure is not limited to any particular implementation of block diagram 700 .

[0094] like Figure 7 As shown, information data bits 710 are encoded by an encoder 720 (e.g., a turbo encoder) and modulated by a modulator 730. A discrete Fourier transform (DFT) unit 740 applies DFT to the modulated data bits, a transmit BW selection unit 755 selects REs 750 corresponding to the assigned PUSCH transmit BW, a unit 760 applies IFFT, and after cyclic prefix insertion (not shown), a filter 770 applies filtering and transmits a signal 780.

[0095] Figure 8 A receiver block diagram 800 of a PUSCH in a subframe according to an embodiment of the present disclosure is illustrated. Figure 8 The illustrated embodiment of block diagram 800 is for illustration only. Figure 8 One or more of the components shown may be implemented in dedicated circuitry configured to perform the functions described, or one or more components may be implemented by one or more processors executing instructions to perform the functions described. Figure 8The scope of the present disclosure is not limited to any particular implementation of block diagram 800 .

[0096] like Figure 8 As shown, received signal 810 is filtered by filter 820. Subsequently, after removing the cyclic prefix (not shown), unit 830 applies FFT, a receive BW selector 845 selects REs 840 corresponding to the assigned PUSCH receive BW, unit 850 applies inverse DFT (IDFT), a demodulator 860 coherently demodulates the data symbols by applying a channel estimate obtained from a DMRS (not shown), and a decoder 870 (e.g., a turbo decoder) decodes the demodulated data to provide estimates of information data bits 880.

[0097] Figure 9 An example antenna block 900 is illustrated according to an embodiment of the present disclosure. Figure 9 The illustrated embodiment of antenna block 900 is for illustration only. Figure 9 The scope of this disclosure is not limited to any particular implementation of antenna block 900 .

[0098] The 3GPP LTE and NR specifications support up to 32 CSI-RS antenna ports, which enables the eNB to be equipped with a large number (such as 64 or 128) of antenna elements. In this case, multiple antenna elements are mapped to one CSI-RS port. For next-generation cellular systems (such as 5G), the maximum number of CSI-RS ports may remain the same or increase. For mmWave bands, although the number of antenna elements may be larger for a given form factor, the number of CSI-RS ports - which may correspond to the number of digital precoding ports - tends to be limited due to hardware constraints (such as the feasibility of installing a large number of ADCs / DACs at mmWave frequencies, e.g. Figure 9 As shown. In this case, one CSI-RS port is mapped to a large number of antenna elements, which can be controlled by a bank of analog phase shifters 901. One CSI-RS port can then correspond to a subarray that produces a narrow analog beam through analog beamforming 905. The analog beam can be configured to sweep across a wide range of angles 920 by changing the phase shifter bank across symbols or subframes. The number of subarrays (equal to the number of RF chains) is proportional to the number of CSI-RS ports N. CSI-PORT The digital beamforming unit 910 spans N CSI-PORT The analog beams are linearly combined to further increase the precoding gain. While the analog beams are broadband (and therefore not frequency selective), the digital precoding can vary across frequency subbands or resource blocks. Receiver operation can be similarly envisioned.

[0099] A codebook-based transmission scheme is used to support UL SU-MIMO transmission. In the LTE UL codebook, a precoder with antenna selection is supported to maintain a low peak-to-average power ratio (PAPR) and a small cubic metric (CM) for rank > 1. Antenna selection provides performance improvements in some cases, especially for SC-FDMA-based UL in LTE.

[0100] In the 5G NR system, two UL transmission schemes are supported, namely codebook-based and non-codebook-based. The codebook-based transmission scheme is based on a UL codebook similar to LTE. However, the NR UL codebook depends on whether the UE can use all or a subset of antenna ports to transmit UL data (PUSCH). For example, the UE may be able to perform at least one of fully coherent (all antenna ports), partially coherent (a subset of antenna ports), and non-coherent UL transmission (a single antenna port) to transmit layers in the UL. The design of the 5G NR UL codebook takes into account the coherence capability of such UEs.

[0101] In both LTE and NR, the UL grant (with DCI format 4 for LTE and DCI format 0_1 ​​for NR) includes a single TPMI field (along with the TRI) that indicates the single precoding vector or matrix (from the UL codebook) that the UE should use for the scheduled UL transmission. Therefore, when multiple PRBs are allocated to the UE, the single precoding matrix indicated by the PMI means that wideband UL precoding is utilized. Despite its simplicity, this is clearly suboptimal, as typical UL channels are frequency selective and UEs are frequency scheduled to transmit using multiple PRBs. A further drawback of UL SU-MIMO is the lack of support for scenarios where accurate UL-CSI is not available at the eNB or gNB (which is important for the correct operation of codebook-based transmissions). This situation may occur in scenarios with highly mobile UEs or in bursty inter-cell interference in cells with poor isolation.

[0102] Therefore, new components need to be designed to enable more efficient support for UL MIMO for the following reasons. First, it is desirable to support frequency selective (or subband) precoding for UL MIMO whenever possible. Second, UL MIMO should provide competitive performance even when accurate UL-CSI is not available at the eNB. Third, the proposed UL MIMO solution should be able to exploit UL-DL reciprocity, where the UE utilizes CSI-RS to provide UL-CSI estimates for TDD and FDD scenarios (with partial UL-DL reciprocity). As described in U.S. patent application serial number 15 / 491,927, entitled "Method and Apparatus for Enabling Uplink MIM," filed on April 19, 2017, which is incorporated herein by reference in its entirety, such efficient UL MIMO operation and components have been proposed.

[0103] Similar to LTE, MIMO has been identified as a fundamental feature of 5G NR in order to achieve high system throughput requirements. One of the key components of the MIMO transmission scheme is to obtain accurate CSI at the eNB (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 using SRS transmission (from the UE) relying on channel reciprocity. On the other hand, for FDD systems, it can be obtained using CSI-RS transmission from the eNB and CSI-RS measurement and CSI feedback from the UE. In NR, two CSI reporting mechanisms are supported, Type I for low-resolution CSI reporting and Type II for high-resolution CSI reporting. In this disclosure, the term "measurement RS" is used to refer to the CSI-RS or SRS used for CSI measurement / reporting. The measurement RS (SRS or CSI-RS) can be dynamically triggered by the NW / gNB (e.g., via DCI in the case of aperiodic RS), which is pre-configured with a specific time domain behavior (such as periodicity and offset in the case of periodic RS), or a combination of such pre-configuration and activation / deactivation (in the case of semi-persistent RS).

[0104] Figure 10 Illustrated are aperiodic CSI-RS measurement and aperiodic CSI reporting operations 1000 according to an embodiment of the present disclosure. Figure 10 The illustrated embodiment of aperiodic CSI-RS measurement and aperiodic CSI reporting operations 1000 is for illustration only. Figure 10 The scope of the present disclosure is not limited to any particular implementation of the aperiodic CSI-RS measurement and aperiodic CSI reporting operations 1000 .

[0105] When the measurement RS is CSI-RS, the CSI request field in the DCI carried on the PDCCH triggers the transmission of aperiodic CSI-RS linked to the aperiodic CSI report. Figure 10 In one example, aperiodic CSI-RS measurement and reporting operations 1000 begin with the gNB / NW signaling a trigger or indication of aperiodic CSI-RS (AP-CSI-RS) to the UE (step 1001). This trigger or indication can be included in DCI (UL-related or DL-related, signaled separately or together with the aperiodic CSI request / trigger) and indicates the transmission of AP-CSI-RS in the same (zero time offset) or later time slot / subframe (>0 time offset). Upon receiving the AP-CSI-RS transmitted by the gNB / NW (step 1002), the UE measures the AP-CSI-RS and then calculates and reports aperiodic CSI (step 1003), including all or a subset of RI, CQI, PMI, LI, and CRI, for example. After receiving the CSI report from the UE, the NW may use the CSI report for a data (PDSCH) transmission (step 1004), and the UE may receive the data (PDSCH) transmission (step 1005).

[0106] Assume μ CSIRS and μ PDCCH are the subcarrier spacing (SCS) configurations for CSI-RS and PDCCH, respectively. In one example, μ CSIRS and μ PDCCH Take a value from {0, 1, 2, 3, 4}, {0, 1, 2, 3, 4} corresponds to (or indicates) the subcarrier spacing value {15kHz, 30kHz, 60kHz, 120kHz}.

[0107] For the subcarrier spacing configuration μ, the time slots are numbered in increasing order within the subframe. and the frames are numbered in ascending order within the frame In the time slot there is consecutive OFDM symbols, where Depends on the cyclic prefix given in Table 1 and Table 2. Time slot in a subframe The start of the OFDM symbol is in the same subframe in time Start alignment.

[0108] Table 1

[0109]

[0110] Table 2

[0111]

[0112] When μ CSIRS =μ PDCCH When , the parameter set of PDCCH and CSI-RS is the same, so if Figure 10 The time offset of AP-CSI-RS transmission is shown to be the same in both parameter sets. CSIRS ≠μ PDCCH When , the parameter sets of PDCCH and CSI-RS are different, so if Figure 10 The time offset of the AP-CSI-RS transmission shown can only be one of the two parameter sets. It is not clear which of the two parameter sets is used for the time offset, and what additional steps are required to determine the time offset in the case of such a mixed parameter set. This disclosure proposes example embodiments that address these issues.

[0113] In one embodiment 1, for each aperiodic CSI-RS resource in a CSI-RS resource set associated with each CSI triggering state, as described in NR, the quasi-co-location configuration of (multiple) quasi-co-location (QCL) RS sources and (multiple) quasi-co-location types is indicated to the UE via high-layer signaling of qcl-info, where the qcl-info contains a reference list of TCI states (TCI-State) of the aperiodic CSI-RS resources associated with the CSI triggering state. If the "State" referenced in the list is configured with a reference to an RS associated with "QCL-Type D", the RS can be an SS / PBCH block located in the same or different CC / DL BWP or a CSI-RS resource configured to be periodically or semi-persistently located in the same or different CC / DL BWP. When receiving aperiodic CSI-RS based on the condition of the scheduling offset (δ) between the last symbol of the PDCCH carrying the triggering DCI and the first symbol of the aperiodic CSI-RS resource in the NZP-CSI-RS-ResourceSet, the UE applies the QCL assumption, and the NZP-CSI-RS-ResourceSet is configured without the higher-layer parameter trs-Info and without the higher-layer parameter repetition. At least one of the following sub-embodiments may be used. Note that the unit of the scheduling offset (δ) is (a plurality of) OFDM symbols.

[0114] In sub-embodiment 1A, the UE does not expect the SCS associated with the PDCCH carrying the triggering DCI to be larger than the CSI-RS SCS, i.e., μ PDCCH ≤μ CSI-RS , and in the aperiodic CSI-RS parameter set μ CSI-RS The scheduling offset is defined in .

[0115] When the scheduling offset is less than the threshold α, that is, δ<α,

[0116] *If there is any other DL signal with the indicated TCI state in the same symbol as the CSI-RS, the UE also applies the QCL assumption of the other DL signal when receiving the aperiodic CSI-RS. When the UE reports the threshold beamSwitchTiming as one of the values ​​{14, 28, 48}, periodic CSI-RS, semi-persistent CSI-RS, the other DL signal refers to a PDSCH scheduled with an offset greater than or equal to the threshold timeDurationForQCL, and an aperiodic CSI-RS scheduled with an offset greater than or equal to α as defined in the NR specification;

[0117] * Otherwise, when receiving aperiodic CSI-RS, the UE applies the QCL assumption for the CORESET associated with the monitored search space with the lowest CORESET-ID in the most recent slot in which one or more CORESETs within the active BWP of the monitoring serving cell are monitored.

[0118] When the scheduling offset is equal to or greater than the threshold α, that is, δ≥α,

[0119] *The UE is expected to apply the QCL assumption in the indicated TCI state for aperiodic CSI-RS resources in the CSI triggering state indicated by the CSI triggering field in the DCI.

[0120] The threshold α is determined according to at least one of the following examples.

[0121] In one example 1A-1, the threshold α=Y+d, where

[0122] *As defined in the NR specification, Y is the threshold beamSwitchTiming reported by the UE, and Y takes a value from the set consisting of {14, 28, 48}.

[0123] *If PDCCH SCS is equal to CSI-RS SCS (μ PDCCH =μ CSI-RS ), then d=0, otherwise or or or or

[0124] In one example 1A-2, the threshold α=Y×d, where

[0125] * Define Y in Example 1A-1,

[0126] * or or

[0127] In one example 1A-3, the threshold α=Y×d, where

[0128] * Define Y in Example 1A-1,

[0129] *

[0130] In one example 1A-4, the threshold α=Y×d, where

[0131] * Define Y in Example 1A-1,

[0132] * or or

[0133] In one example 1A-5, the threshold α=Y×d, where

[0134] * Define Y in Example 1A-1,

[0135] * or or

[0136] In one example 1A-6, the threshold α=Y×d, where

[0137] * Define Y in Example 1A-1,

[0138] *

[0139] In one example 1A-7, the threshold α=Y×d, where

[0140] * Define Y in Example 1A-1,

[0141] *If μ PDCCH =μ CSI-RS , then d=0, otherwise d=M.

[0142] The parameter M in Examples 1A-4 to 1A-7 is determined according to at least one of the following alternatives (Alt).

[0143] *In one alternative Alt 1A-0: M=Y.

[0144] *In one alternative, Alt 1A-1: M=14.

[0145] *In one alternative, Alt 1A-2: M=12.

[0146] *In one alternative Alt 1A-3: M depends on Y; for example, if Y=14 or 28, then M=14, and if Y=48, then M=12.

[0147] * In one alternative, Alt 1A-4: M depends on μ CSI-RS , for example, if μ CSI-RS ≠2, then M=14, and if μ CSI-RS =2, then M=12.

[0148] *In one alternative Alt 1A-5: M = m OFDM symbols; for example, m is the span of the PDCCH monitoring opportunity for receiving the triggering DCI, expressed in the number of OFDM symbols.

[0149] *In one alternative, Alt 1A-6: M = m OFDM symbols, and m is configured, for example, via higher layer or more dynamic MAC CE-based or DCI-based signaling, either explicitly (using new state or configuration parameters) or implicitly (using one of the existing state and configuration parameters).

[0150] *In one alternative Alt 1A-7: M = m OFDM symbols, and m is reported by the UE, eg as part of UE capability signaling.

[0151] *In one alternative, Alt 1A-8: M = m OFDM symbols, and m is fixed (e.g., 12 or 14). In one example, m = Δ, where the value of Δ is given by at least one of the examples in 3A-6 and 3A-6a. For example, in another example, the value of m is given by:

[0152] **μ PDCCH =0 (i.e. 15kHz SCS): m=4 symbols;

[0153] **μ PDCCH =1 (i.e. 30kHz SCS): m=4 symbols;

[0154] **μ PDCCH =2 (i.e. 60kHz SCS): m=8 symbols;

[0155] **μ PDCCH =3 (i.e., 120kHz SCS): m=8 or 12 symbols.

[0156] In another example, the value of m is given by:

[0157] **t=1:m=4 symbols;

[0158] **t=2:m=4 symbols;

[0159] **t=4:m=4 symbols;

[0160] **t=8:m=8 symbols;

[0161] **t=16:m=8 or 12 symbols;

[0162] in or or In these examples, the value of m can be either without a quantization step (see Example 3A-6a-1) or with a quantization step (see Example 3A-6a-2).

[0163] In one example 1A-8, the threshold α=Y(1+d), where

[0164] * Define Y in Example 1A-1,

[0165] *d was determined according to one of Examples 1A-1, 1A-4, 1A-5, 1A-6 and 1A-7.

[0166] In one example 1A-9, the threshold in

[0167] * Define Y in Example 1A-1,

[0168] *d was determined according to one of Examples 1A-1, 1A-4, 1A-5, 1A-6 and 1A-7.

[0169] In sub-embodiment 1B, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RS It can take any value and is used in the parameter set μ of the aperiodic CSI-RS. CSI-RS In addition to the condition "If PDCCH SCS is equal to CSI-RS SCS (μ PDCCH =μ CSI-RS )" is replaced by the condition "If PDCCH SCS is greater than or equal to CSI-RS SCS (μ PDCCH ≥μ CSI-RS )”, the remaining details are the same or similar to those in sub-embodiment 1A (including all examples and alternatives).

[0170] In sub-embodiment 1C, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RSCan take any value. The scheduling offset is defined based on the maximum subcarrier spacing between PDCCH and aperiodic CSI-RS. Therefore, when μ PDCCH ≤μ CSI-RS When the parameter set μ of the aperiodic CSI-RS is CSI-RS The scheduling offset is defined in , and the remaining details are the same or similar to those in Sub-Example 1A (including all examples and alternatives). PDCCH >μ CSI-RS When the PDCCH parameter set μ PDCCH The scheduling offset is defined in CSI-RS and μ PDCCH Exchange everywhere (i.e. μ CSI-RS Replace with μ PDCCH And μ PDCCH Replace with μ CSI-RS ), the remaining details are the same or similar to those in sub-embodiment 1A (including all examples and alternatives).

[0171] In sub-embodiment 1D, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RS Can take any value. The scheduling offset is defined based on the minimum subcarrier spacing between PDCCH and aperiodic CSI-RS. Therefore, when μ PDCCH >μ CSI-RS When the parameter set μ of the aperiodic CSI-RS is CSI-RS The scheduling offset is defined in , and the remaining details are the same or similar to those in Sub-Example 1A (including all examples and alternatives). PDCCH ≤μ CSI-RS When the PDCCH parameter set μ PDCCH The scheduling offset is defined in CSI-RS and μ PDCCH Exchange everywhere (i.e. μ CSI-RS Replace with μ PDCCH And μ PDCCH Replace with μ CSI-RS ), the remaining details are the same or similar to those in sub-embodiment 1A (including all examples and alternatives).

[0172] In one embodiment 2, when aperiodic CSI-RS is used with aperiodic CSI reporting, the CSI-RS triggering offset X is configured for each resource set by the higher-layer parameter aperiodicTriggeringOffset. The CSI-RS triggering offset has a value of {0, 1, 2, 3, 4, 16, 24} time slots. Note that the unit of the CSI-RS triggering offset is (multiple) time slots. The aperiodic CSI-RS is sent in time slot n′+X, where X is the CSI-RS triggering offset in the parameter set of the CSI-RS according to the higher-layer parameter aperiodicTriggeringOffset, and n′ is the reference time slot for applying the time slot offset for AP-CSI-RS transmission. If all associated triggering states do not have the higher-layer parameter qcl-Type set to "QCL-TypeD" in the corresponding TCI state and the PDCCH SCS is equal to the CSI-RS SCS, the CSI-RS triggering offset X is fixed to zero.

[0173] The value n′ depends on μ PDCCH =μ CSI-RS Still μ PDCCH ≠μ CSI-RS At least one of the following sub-embodiments may be used.

[0174] In a sub-embodiment 2A, the UE does not expect the SCS associated with the PDCCH carrying the triggering DCI to be larger than the CSI-RS SCS, i.e., μ PDCCH ≤μ CSI-RS , and in the aperiodic CSI-RS parameter set μ CSI-RS The time slot offset is defined in [ 0 ] . Let n be the time slot with the triggered DCI in the parameter set of the PDCCH containing the triggered DCI. The reference time slot n' is then determined according to at least one of the following examples.

[0175] In one example 2A-1,

[0176] *If PDCCH SCS is equal to CSI-RS SCS (μ PDCCH =μ CSI-RS ), then n′=n

[0177] *otherwise or or

[0178] In one example 2A-2,

[0179] *If μ PDCCH =μ CSI-RS , then n′=n

[0180] *otherwise or or

[0181] In one example 2A-3, or or

[0182] In one example 2A-4, or or

[0183] In one example 2A-5,

[0184] In one example 2A-6,

[0185] In one example 2A-7, or or When μ PDCCH =μ CSI-RS When , e is an indicator that takes the value e=0, otherwise it takes another value e=1.

[0186] In one example 2A-8, When μ PDCCH =μ CSI-RS When , e is an indicator that takes the value e=0, otherwise it takes another value e=1.

[0187] In a sub-embodiment 2B, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RS It can take any value and is used in the parameter set μ of the aperiodic CSI-RS. CSI-RS In addition to the condition "If PDCCH SCS is equal to CSI-RS SCS (μ PDCCH =μ CSI-RS )" is replaced by the condition "If PDCCH SCS is greater than or equal to CSI-RS SCS (μ PDCCH ≥μ CSI-RS )”, the remaining details are the same or similar to those in sub-embodiment 2A (including all examples and alternatives).

[0188] In sub-embodiment 2C, there is no restriction on PDCCH and CSI-RS SCS, that is, μPDCCH and μ CSI-RS Can take any value. The slot offset is defined based on the maximum subcarrier spacing between PDCCH and aperiodic CSI-RS. Therefore, when μ PDCCH ≤μ CSI-RS When the parameter set μ of the aperiodic CSI-RS is CSI-RS The time slot offset is defined in , and the remaining details are the same or similar to those in Sub-Example 2A (including all examples and alternatives). PDCCH >μ CSI-RS When the PDCCH parameter set μ PDCCH The time slot offset is defined in , and, in addition to μ CSI-RS and μ PDCCH Exchange everywhere (i.e. μ CSI-RS Replace with μ PDCCH And μ PDCCH Replace with μ CSI-RS ), the remaining details are the same or similar to those in sub-embodiment 2A (including all examples and alternatives).

[0189] In sub-embodiment 2D, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RS Can take any value. The slot offset is defined based on the minimum subcarrier spacing between PDCCH and aperiodic CSI-RS. Therefore, when μ PDCCH >μ CSI-RS When the parameter set μ of the aperiodic CSI-RS is CSI-RS The time slot offset is defined in , and the remaining details are the same or similar to those in Sub-Example 2A (including all examples and alternatives). PDCCH ≤μ CSI-RS When the PDCCH parameter set μ PDCCH The slot offset is defined in CSI-RS and μ PDCCH Exchange everywhere (i.e. μ CSI-RS Replace with μ PDCCH And μ PDCCH Replace with μ CSI-RS ), the remaining details are the same or similar to those in sub-embodiment 2A (including all examples and alternatives).

[0190] In a sub-embodiment 2E, the CSI-RS triggering offset X in some embodiments of the present disclosure takes a value from a set S, where the unit of X is the time slot in the CSI-RS parameter set, and the set S includes {0, 1, 2, 3, 4, 16, 24}. The set S also includes additional values ​​from another set T, where the other set T is based on at least one of the following alternatives.

[0191] *In an alternative Alt 2E-1: T is empty, that is, the set S = {0, 1, 2, 3, 4, 16, 24}.

[0192] * In an alternative Alt 2E-2: T = {5, 6, ..., 15, 17, 18, ..., 23, 25, 26, ..., Z}, i.e., the set S = {0, 1, 2, 3, 4, ..., Z}. Here, Z is fixed (e.g., fixed to 31 or 32) or configured (e.g., configured according to 31 or 32).

[0193] * In an alternative Alt 2E-3: T = {5, 6, ..., 15, 17, 18, ..., Z}, i.e., the set S = {0, 1, 2, 3, 4, ..., Z}. Here, Z is fixed (e.g., fixed to 4, 31, or 32) or configured (e.g., configured according to 24 or 32).

[0194] *In an alternative Alt 2E-4: T = {8}, that is, the set S = {0, 1, 2, 3, 4, 8, 16, 24}.

[0195] *In an alternative Alt 2E-5: T = {6, 8}, that is, the set S = {0, 1, 2, 3, 4, 6, 8, 16, 24}.

[0196] *In an alternative Alt 2E-6: T = {8, 12}, that is, the set S = {0, 1, 2, 3, 4, 8, 12, 16, 24}.

[0197] *In an alternative Alt 2E-7: T = {8, 32}, that is, the set S = {0, 1, 2, 3, 4, 8, 16, 24, 32}.

[0198] *In an alternative Alt 2E-8: T = {6, 8, 12}, that is, the set S = {0, 1, 2, 3, 4, 6, 8, 12, 16, 24}.

[0199] *In an alternative Alt 2E-9: T = {8, 12, 32}, that is, the set S = {0, 1, 2, 3, 4, 8, 12, 16, 24, 32}.

[0200] *In an alternative Alt 2E-10: T = {6, 8, 12, 32}, that is, the set S = {0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32}.

[0201] * In an alternative Alt 2E-11: T = {Z}, i.e., the set S = {0, 1, 2, 3, 4, 16, 24, Z}. Here, Z is fixed (e.g., fixed to a value from {6, 8, 12, 32}) or configured (e.g., configured according to {6, 8, 12, 32}).

[0202] * In an alternative Alt 2E-12: T = {Z1, Z2}, i.e., the set S = {0, 1, 2, 3, 4, 16, 24, Z1, Z2}. Here, Z1 and Z2 are fixed (e.g., fixed to two values ​​from {6, 8, 12, 32}) or configured (e.g., configured according to {6, 8, 12, 32}).

[0203] * In an alternative Alt 2E-13: T = {Z1, Z2, Z3}, i.e., the set S = {0, 1, 2, 3, 4, 16, 24, Z1, Z2, Z3}. Here, Z1, Z2, and Z3 are fixed (e.g., fixed to three values ​​from {6, 8, 12, 32}) or configured (e.g., configured according to {6, 8, 12, 32}).

[0204] * In an alternative Alt 2E-14: T = {Z1, Z2, Z3, Z4}, i.e., the set S = {0, 1, 2, 3, 4, 16, 24, Z1, Z2, Z3, Z4}. Here, Z1, Z2, Z3, and Z4 are fixed (e.g., fixed to four values ​​from {6, 8, 12, 20, 28, 32}) or configured (e.g., configured according to {6, 8, 12, 20, 28, 32}).

[0205] In a sub-embodiment 2F, the set S includes the additional values ​​Alt2E-1 to Alt2E-14 according to sub-embodiment 2E only if certain conditions are met. For example, certain conditions may be based on μ PDCCH and μ CSI-RS For some conditions, at least one of the following alternatives can be used.

[0206] In an alternative Alt 2F-1, for μ PDCCH >μ CSI-RS and μ PDCCH <μ CSI-RS The set S includes the additional values ​​in the set T, where the set T is for when μ PDCCH >μ CSI-RS and μ PDCCH <μ CSI-RS The two cases are the same and depend on at least one of Alt 2E-1 to Alt 2E-13. PDCCH =μCSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0207] In an alternative Alt 2F-1a, for μ PDCCH >μ CSI-RS and μ PDCCH <μ CSI-RS The set S includes the additional values ​​in the set T, where the set T is for when μ PDCCH >μ CSI-RS and μ PDCCH <μ CSI-RS The two cases may be different and depend on at least one of Alt 2E-1 to Alt 2E-13. PDCCH =μ CSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0208] In an alternative Alt 2F-2, for μ PDCCH >μ CSI-RS and μ PDCCH ≤μ CSI-RS The set S includes the additional values ​​in the set T, where the set T is for when μ PDCCH >μ CSI-RS and μ PDCCH ≤μ CSI-RS Both cases are identical and depend on at least one of Alt 2E-1 to Alt 2E-13.

[0209] In an alternative Alt 2F-2a, for μ PDCCH >μ CSI-RS and μ PDCCH ≤μ CSI-RS The set S includes the additional values ​​in the set T, where the set T is for when μ PDCCH >μ CSI-RS and μ PDCCH ≤μ CSI-RS The two cases may be different and depend on at least one of Alt 2E-1 to Alt 2E-13.

[0210] In an alternative Alt 2F-3, for μ PDCCH ≥μ CSI-RS and μ PDCCH <μ CSI-RS The set S includes the additional values ​​in the set T, where the set T is for when μ PDCCH ≥μ CSI-RS and μ PDCCH <μ CSI-RSBoth cases are identical and depend on at least one of Alt 2E-1 to Alt 2E-13.

[0211] In an alternative Alt 2F-3a, for μ PDCCH ≥μ CSI-RS and μ PDCCH <μ CSI-RS The set S includes the additional values ​​in the set T for the two cases when μ PDCCH ≥μ CSI-RS and μ PDCCH <μ CSI-RS In the two cases, the set T may be different and is based on at least one of Alt 2E-1 to Alt 2E-13.

[0212] In an alternative Alt 2F-4, only if μ PDCCH >μ CSI-RS When μ , the set S includes additional values ​​in the set T, where the set T is determined by at least one of Alt 2E-1 to Alt 2E-13. PDCCH <μ CSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0213] In an alternative Alt 2F-5, only if μ PDCCH <μ CSI-RS When μ , the set S includes additional values ​​in the set T, where the set T is based on at least one of Alt 2E-1 to Alt 2E-13. PDCCH >μ CSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0214] In an alternative Alt 2F-6, only if μ PDCCH ≥μ CSI-RS When μ , the set S includes additional values ​​in the set T, where the set T is based on at least one of Alt 2E-1 to Alt 2E-13. PDCCH <μ CSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0215] In an alternative Alt 2F-7, only if μ PDCCH ≤μ CSI-RS When μ , the set S includes additional values ​​in the set T, where the set T is determined by at least one of Alt 2E-1 to Alt 2E-13. PDCCH >μ CSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0216] In an alternative Alt 2F-8, only if μ PDCCH >μ CSI-RS When μ , the set S includes additional values ​​in the set T, where the set T is determined by at least one of Alt 2E-1 to Alt 2E-13. PDCCH ≤μ CSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0217] In an alternative Alt 2F-9, only if μ PDCCH <μ CSI-RS When μ , the set S includes additional values ​​in the set T, where the set T is determined by at least one of Alt 2E-1 to Alt 2E-13. PDCCH ≥μ CSI-RS When , the set S = {0, 1, 2, 3, 4, 16, 24}.

[0218] In one embodiment 3, it is assumed that k is the number of (OFDM) symbols between the end of the PDCCH containing the triggered DCI and the CSI-RS. To avoid a short time between DCI decoding and the start of receiving the triggered CSI-RS at the UE, which can occur when k is too small, UE processing can be relaxed. At least one of the following embodiments can be used for this purpose.

[0219] In a sub-embodiment 3A, the UE does not expect the SCS associated with the PDCCH carrying the triggering DCI to be larger than the CSI-RS SCS, i.e., μ PDCCH ≤μ CSI-RS , and in the aperiodic CSI-RS parameter set μ CSI-RS In one example, regardless of μ PDCCH and μ CSI-RS In another example, when μ PDCCH =μ CSI-RS When , no processing relaxation is performed, and when μ PDCCH <μ CSI-RS When UE processing relaxation is performed according to at least one of the following examples.

[0220] In one example 3A-1, the UE does not expect the PDCCH carrying the triggering DCI to be included in the last x symbols of the slot (in the CSI-RS parameter set), ie, k≥x. In one example, x=10.

[0221] In one example 3A-2, if there are less than or or symbols, namely or or The UE is not required to process the aperiodic CSI-RS. Here, m is defined according to at least one of Alt1A-5, Alt1A-6, Alt1A-7, and Alt1A-8, or m is fixed.

[0222] In one example 3A-3, the CSI-RS triggering offset X is always greater than zero.

[0223] In one example 3A-4, UE processing is relaxed by y slots in the CSI-RS parameter set. In one example, y=1.

[0224] In one example 3A-5, the slot offset is applied as follows.

[0225] *If μ PDCCH ≠μ CSI-RS , then the time slot offset = max(1, X), and

[0226] *If μ PDCCH =μ CSI-RS , then the time slot offset = X.

[0227] In one example 3A-6, UE processing relaxation is based on selecting an appropriate Beamswitchtiming Y (see embodiment 1).

[0228] In one example 3A-6a, UE processing relaxation is based on defining the earliest possible starting point of CSI-RS transmission / reception (T). In one example, T = end of PDCCH + Δ or end of PDCCH + Δ × t, where or or And Δ is defined according to at least one of the following examples.

[0229] *In one example Ex 3A-6a-1: Δ is determined as a number of symbols based on the CSI-RS SCS count from the end of the last symbol of the received PDCCH symbols to the start of the first symbol of the corresponding received CSI-RS, i.e., if the CSI-RS starts no earlier than at least Δ=Ncsirs PDCCH symbols after the end of the PDCCH that triggered the aperiodic CSI-RS, then the UE is expected to be able to measure the aperiodic CSI-RS.

[0230] *In one example Ex 3A-6a-2: Δ is determined as a number of symbols based on the CSI-RS SCS count from the end of the last symbol of the received PDCCH symbol to the start of the first symbol of the corresponding received CSI-RS, which is quantized to the next CSI-RS slot boundary (using the granularity of the CSI-RS slot duration), i.e., the UE is expected to be able to measure aperiodic CSI-RS if the CSI-RS starts no earlier than the first symbol of the slot of the CSI-RS carrier whose slot starts at least Δ = Ncsirs PDCCH symbols after the end of the PDCCH that triggered the aperiodic CSI-RS.

[0231] When μ PDCCH >μ CSI-RS For the UE processing relaxation time (T), definition Ex 3A-6a-1 is used.

[0232] In one example, the delta value is given by:

[0233] *μ PDCCH =0 (i.e. 15kHz SCS): Δ=4 symbols;

[0234] *μ PDCCH =1 (i.e. 30kHz SCS): Δ=4 symbols;

[0235] *μ PDCCH =2 (i.e. 60kHz SCS): Δ=8 symbols;

[0236] *μ PDCCH =3 (ie, 120kHz SCS): Δ=8 or 12 symbols.

[0237] In another example, the Δ value is given by:

[0238] * t = 1: Δ = 4 symbols;

[0239] * t = 2: Δ = 4 symbols;

[0240] *t=4: Δ=4 symbols;

[0241] *t=8: Δ=8 symbols;

[0242] * t = 16: Δ = 8 or 12 symbols;

[0243] in or or

[0244] In another example, the Δ value is given by m×t, where or or And m is fixed, for example, fixed to 4.

[0245] In another example, the Δ value is fixed, for example, fixed to 4.

[0246] In these examples, the delta value may be without a quantization step (Ex 3A-6a-1) or with a quantization step (Ex 3A-6a-2).

[0247] In one example 3A-7, UE processing slack depends on the X value ∈ aperiodicTriggeringOffset {0, .., 4, 16, 24}

[0248] *If X=0, relaxation is performed according to at least one of Examples 3A-1 to 3A-6 and 3A-6a.

[0249] * If X > 0, no processing relaxation is performed.

[0250] In a sub-embodiment 3AA, the UE does not expect the SCS associated with the PDCCH carrying the triggering DCI to be larger than the CSI-RS SCS, i.e., μ PDCCH ≤μ CSI-RS , and in the PDCCH parameter set μ PDCCH In one example, regardless of μ PDCCH and μ CSI-RS In another example, when μ PDCCH =μ CSI-RS When , no processing relaxation is performed, and when μ PDCCH <μ CSI-RS When UE processing relaxation is performed according to at least one of the following examples.

[0251] In one example 3AA-1, the UE does not expect the PDCCH carrying the triggering DCI to be included in the last x symbols of the slot (in the PDCCH parameter set), ie, k≥x. In one example, x=10.

[0252] In one example 3AA-2, if there are less than or or symbols, namely or or The UE is not required to process the aperiodic CSI-RS. Here, m is defined according to at least one of Alt1A-5, Alt1A-6, and Alt1A-7, or m is fixed.

[0253] In one example 3AA-3, the CSI-RS triggering offset X is always greater than zero.

[0254] In one example 3AA-4, UE processing is relaxed by y slots in the PDCCH parameter set. In one example, y=1.

[0255] In one example 3AA-5, the slot offset is applied as follows.

[0256] *If μ PDCCH ≠μ CSI-RS , then the time slot offset = max(1, X), and

[0257] *If μ PDCCH =μ CSI-RS , then the time slot offset = X.

[0258] In one example 3AA-6, UE processing relaxation is based on selecting an appropriate Beamswitchtiming Y (see embodiment 1).

[0259] In one example 3AA-6a, UE processing relaxation is based on defining the earliest possible starting point of CSI-RS transmission / reception (T). In one example, T = end of PDCCH + Δ or end of PDCCH + Δ × t, where or or And Δ is defined according to at least one of the following examples.

[0260] * In one example Ex 3AA-6a-1: Δ is determined as a number of symbols based on the PDCCH SCS count from the end of the last symbol of the received PDCCH symbols to the start of the first symbol of the corresponding received CSI-RS, i.e., if the CSI-RS starts no earlier than at least Δ=Ncsirs PDCCH symbols after the end of the PDCCH that triggered the aperiodic CSI-RS, then the UE is expected to be able to measure the aperiodic CSI-RS.

[0261] * In one example Ex 3AA-6a-2: Δ is determined as a number of symbols based on the PDCCH SCS count from the end of the last symbol of the received PDCCH symbols to the start of the first symbol of the corresponding received CSI-RS, which is quantized to the next CSI-RS slot boundary (using the granularity of the CSI-RS slot duration), i.e., the UE is expected to be able to measure aperiodic CSI-RS if the CSI-RS starts no earlier than the first symbol of the slot of the CSI-RS carrier whose slot starts at least Δ=Ncsirs PDCCH symbols after the end of the PDCCH that triggered the aperiodic CSI-RS.

[0262] When μ PDCCH >μ CSI-RS For the UE processing relaxation time (T), definition Ex 3AA-6a-1 is used.

[0263] In one example, the delta value is given by:

[0264] *μ PDCCH =0 (i.e. 15kHz SCS): Δ=4 symbols;

[0265] *μ PDCCH =1 (i.e. 30kHz SCS): Δ=4 symbols;

[0266] *μ PDCCH =2 (i.e. 60kHz SCS): Δ=8 symbols;

[0267] *μ PDCCH =3 (ie, 120kHz SCS): Δ=8 or 12 symbols.

[0268] In another example, the Δ value is given by:

[0269] * t = 1: Δ = 4 symbols;

[0270] * t = 2: Δ = 4 symbols;

[0271] *t=4: Δ=4 symbols;

[0272] *t=8: Δ=8 symbols;

[0273] * t = 16: Δ = 8 or 12 symbols;

[0274] in or or

[0275] In another example, the Δ value is given by m×t, where or or And m is fixed, for example, fixed to 4.

[0276] In another example, the delta value is fixed, for example, fixed to 4 or 8.

[0277] In these examples, the delta value may be without a quantization step (Ex 3AA-6a-1) or with a quantization step (Ex 3AA-6a-2).

[0278] In one example 3AA-7, UE processing slack depends on the X value ∈ aperiodicTriggeringOffset {0, .., 4, 16, 24}

[0279] *If X=0, relaxation is performed according to at least one of Examples 3AA-1 to 3AA-6 and 3AA-6a.

[0280] * If X > 0, no processing relaxation is performed.

[0281] In a sub-embodiment 3B, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RS It can take any value and is used in the parameter set μ of the aperiodic CSI-RS. CSI-RS In addition to the condition "If PDCCH SCS is equal to CSI-RS SCS (μ PDCCH =μ CSI-RS )" is replaced by the condition "If PDCCH SCS is greater than or equal to CSI-RS SCS (μ PDCCH ≥μ CSI-RS )”, the remaining details are the same or similar to those in sub-embodiment 3A / 3AA (including all examples and alternatives).

[0282] In sub-embodiment 3C, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RS Can take any value. UE processing relaxation is defined based on the maximum subcarrier spacing between PDCCH and aperiodic CSI-RS. Therefore, when μ PDCCH ≤μ CSI-RS When the parameter set μ of the aperiodic CSI-RS is CSI-RS UE processing relaxation is defined in , and the remaining details are the same or similar to those in Sub-Example 3A (including all examples and alternatives). PDCCH >μ CSI-RSWhen the PDCCH parameter set μ PDCCH UE processing relaxation is defined in CSI-RS and μ PDCCH Exchange everywhere (i.e. μ CSI-RS Replace with μ PDCCH And μ PDCCH Replace with μ CSI-RS ), the remaining details are the same or similar to those in sub-embodiment 3A (including all examples and alternatives).

[0283] In sub-embodiment 3D, there is no restriction on PDCCH and CSI-RS SCS, that is, μ PDCCH and μ CSI-RS Can take any value. UE processing relaxation is defined based on the minimum subcarrier spacing between PDCCH and aperiodic CSI-RS. Therefore, when μ PDCCH >μ CSI-RS When the parameter set μ of the aperiodic CSI-RS is CSI-RS UE processing relaxation is defined in , and the remaining details are the same or similar to those in Sub-Example 3A (including all examples and alternatives). PDCCH ≤μ CSI-RS When the PDCCH parameter set μ PDCCH UE processing relaxation is defined in CSI-RS and μ PDCCH Exchange everywhere (i.e. μ CSI-RS Replace with μ PDCCH And μ PDCCH Replace with μ CSI-RS ), the remaining details are the same or similar to those in sub-embodiment 3A (including all examples and alternatives).

[0284] In one embodiment 4A, the PDCCH containing the triggering DCI triggers the UE's AP-SRS transmission. Embodiments 1 to 3 (regarding AP-CSI-RS reception) can be used by the UE in a straightforward manner (similarly) for AP-SRS transmission.

[0285] Regarding AP-SRS, for a UE configured with one or more SRS resource configurations, and when the higher-layer parameter resourceType in SRS-Resource is set to "aperiodic":

[0286] The UE receives the configuration of the SRS resource set;

[0287] The UE receives downlink DCI, group-common DCI, or an uplink DCI-based command, where the codepoint of the DCI can trigger one or more SRS resource sets. For SRS in a resource set with usage set to "codebook" or "antenna switching", the minimum time interval between the last symbol of the PDCCH that triggers aperiodic SRS transmission and the first symbol of the SRS resource is N2. Otherwise, the minimum time interval between the last symbol of the PDCCH that triggers aperiodic SRS transmission and the first symbol of the SRS resource is N2+14. The minimum time interval in OFDM symbols is counted based on the minimum subcarrier spacing between the PDCCH and the aperiodic SRS.

[0288] If the UE receives a DCI triggering aperiodic SRS in time slot n, the UE Aperiodic SRS is sent in each of the (multiple) triggered SRS resource sets in , where k is configured for each triggered SRS resource set via the higher-layer parameter slotOffset and is based on the subcarrier spacing in which the triggered SRS is sent, μSRS and μPDCCH are the subcarrier spacing configurations of the triggered SRS and PDCCH carrying the triggering command, respectively.

[0289] According to this embodiment, the minimum time interval in units of OFDM symbols is counted based on the minimum subcarrier spacing between the PDCCH and the aperiodic SRS. Alternatively, the minimum time interval between the last symbol of the PDCCH that triggers the aperiodic SRS transmission and the first symbol of the SRS resource is t = N2 + z × p or t = (N2 + z) × p, where z = 0 for the SRS in the resource set with usage set to "codebook" or "antenna switching", otherwise z = X > 0 (i.e., for the SRS in the resource set with usage set to "noncodebook" or "beam management"). In one example, X = 14. The parameter p is determined according to at least one of the following examples.

[0290] In one example, or or or or

[0291] In another example, or or

[0292] In another example,

[0293] Likewise, if the UE receives a DCI triggering an aperiodic SRS in slot n, the UE transmits an aperiodic SRS in each of the triggered SRS resource sets in slot n′+k, where k is configured for each triggered SRS resource set via a higher layer parameter slotOffset, and n′ is determined according to at least one of Examples 2A-1 to 2A-8, except that in these examples μ CSI-RS Need to be replaced by μ SRS outside.

[0294] In one embodiment 4B, a PDCCH containing triggering DCI triggers the UE to receive an aperiodic DL RS (e.g., CSI-RS). Embodiments 1 to 3 (regarding AP-CSI-RS reception) can be used by the UE in a straightforward manner (similarly) for aperiodic DL RS (e.g., CSI-RS) reception.

[0295] In one embodiment 4C, the PDCCH containing the triggering DCI triggers the UE to transmit aperiodic UL RS (e.g., SRS). Embodiments 1 to 3 (regarding AP-CSI-RS reception) can be used by the UE in a straightforward manner (similarly) for aperiodic UL RS (e.g., SRS) transmission.

[0296] When the higher layer parameter txConfig is set to "nonCodebook", the UE may be configured with non-codebook based UL transmission.

[0297] For non-codebook based transmission, PUSCH can be scheduled via DCI format 0_0, DCI format 0_1 ​​or semi-statically configured to operate. When multiple SRS resources are configured, the UE can determine its PUSCH precoder and transmission rank based on the SRI, where the SRI is given by the SRS resource indicator in the DCI, or the SRI is given by the srs-ResourceIndicator. The UE can use one or more SRS resources for SRS transmission, where, in the SRS resource set, the maximum number of SRS resources that can be configured to be transmitted simultaneously by the UE in the same symbol and the maximum number of SRS resources is the UE capability. In one example, each SRS resource is configured with only one SRS port. In one example, only one SRS resource set can be configured with the high-level parameter usage set to "nonCodebook" in the SRS-ResourceSet. In one example, the maximum number of SRS resources that can be configured for non-codebook based uplink transmission is 4. The SRI indicated in time slot n is associated with the most recent transmission of the (multiple) SRS resources identified by the SRI, where the SRS transmission precedes the PDCCH carrying the SRI.

[0298] For non-codebook based transmission, the UE may calculate the precoder used for SRS transmission based on measurements of the associated NZP CSI-RS resource. The UE may be configured with only one NZP CSI-RS resource for an SRS resource set where the higher layer parameter usage in the SRS-ResourceSet is set to "nonCodebook" if configured.

[0299] - If an aperiodic SRS resource set is configured, the associated NZP-CSI-RS is indicated via the SRS request field in DCI formats 0_1 and 1_1, where AperiodicSRS-ResourceTrigger (indicating the association between the aperiodic SRS triggering state and the SRS resource set), the triggered SRS resource(srs-ResourceSetId), and the csi-RS (indicating the associated NZP-CSI-RS-ResourceId) is the higher layer configured in the SRS-ResourceSet. If the interval between the last symbol received for the aperiodic NZP-CSI-RS resource and the first symbol transmitted for the aperiodic SRS is less than 42 OFDM symbols, the UE is not expected to update the SRS precoding information.

[0300] If the UE is configured with aperiodic SRS associated with aperiodic NZP CSI-RS resources, the presence of the associated CSI-RS is indicated by the SRS request field when the value of the SRS request field is not "00" and when the scheduling DCI is not for cross-carrier or cross-bandwidth partial scheduling. The CSI-RS is located in the same time slot as the SRS request field. If the UE is configured with aperiodic SRS associated with aperiodic NZP CSI-RS resources, any TCI state configured in the scheduled CC should not be configured with "QCL-Type D".

[0301] In the following embodiments regarding this component, we assume that the UE is configured with an SRS resource set and associated CSI-RS in an SRS-ResourceSet of the SRS resource set for non-codebook based UL transmission, the details of which are described above. We further assume that the SRS resource(s) in the SRS resource set are configured as aperiodic.

[0302] In one embodiment 5A, a PDCCH containing DCI triggers AP-SRS, where the AP-SRS is associated with the AP-CSI-RS (e.g., the UE can receive the AP-CSI-RS to obtain beamforming / precoding information for precoded AP-SRS transmission). In one example, the AP-CSI-RS is associated with the AP-SRS via a higher layer configuration (this is relevant when DL-UL beam correspondence or reciprocity applies). In this case, at least one of embodiments 1-3 and sub-embodiments therein can (similarly) be used for aperiodic CSI-RS transmission. The DCI that triggers the aperiodic CSI-RS can be DL-related DCI or UL-related DCI.

[0303] Let μ PDCCH 、μ CSI-RS and μ SRS are the subcarrier spacing configurations for PDCCH, CSI-RS and SRS respectively. In the following embodiments, the subcarrier spacing configurations for PDCCH and CSI-RS are the same, i.e., μ PDCCH =μ CSI-RS , and the subcarrier spacing configuration for SRS can be different from the subcarrier spacing configuration for PDCCH / CSI-RS.

[0304] In one embodiment 5B, the PDCCH containing the DCI triggers the AP-SRS, where the AP-SRS is associated with the AP-CSI-RS (e.g., the UE can receive the AP-CSI-RS to obtain beamforming / precoding information for the precoded AP-SRS transmission). In one example, the AP-CSI-RS is associated with the AP-SRS via higher layer configuration (this is relevant when DL-UL beam correspondence or reciprocity applies).

[0305] Regarding the QCL assumption for SRS transmission, it is not expected that the UE is configured with "QCL-Type D" indicating spatial filtering information (the spatial filtering information is instead derived based on the AP-CSI-RS associated with the AP-SRS).

[0306] Since the CSI-RS and the PDCCH are located in the same time slot, the time slot offset between the PDCCH and the CSI-RS is zero.

[0307] The minimum time interval between the last symbol of the PDCCH that triggers aperiodic SRS transmission and the first symbol of the SRS resource is determined according to at least one example / alternative of embodiment 4A.

[0308] The slot offset between PDCCH and SRS transmissions is determined according to at least one example / alternative of embodiment 4A.

[0309] The processing time between AP-CSI-RS reception and AP-SRS transmission is required so that the UE can derive / calculate updated SRS precoding information after AP-CSI-RS reception. At least one of the following examples is used for processing time.

[0310] *In one example 5B-1, if the interval between the last symbol received for an aperiodic NZP-CSI-RS resource and the first symbol transmitted for an aperiodic SRS is less than Z OFDM symbols, then the UE is not expected to update the SRS precoding information. In one alternative, Z is fixed (e.g., 42). In another alternative, Z is configured for the UE.

[0311] *In one example 5B-2, if the spacing between the last symbol received for an aperiodic NZP-CSI-RS resource and the first symbol transmitted for an aperiodic SRS is less than Z OFDM symbols, then the UE is not expected to update the SRS precoding information, where OFDM symbols are counted based on the minimum subcarrier spacing between the PDCCH (or AP-CSI-RS) and the AP-SRS. In one alternative, Z is fixed (e.g., 42). In another alternative, Z is configured for the UE.

[0312] *In one example 5B-3, if the interval between the last symbol received for the aperiodic NZP-CSI-RS resource and the first symbol transmitted for the aperiodic SRS is less than 42×q OFDM symbols, then the UE is not expected to update the SRS precoding information, where the parameter q is determined according to at least one of the following examples. Note that here, μ PDCCH =μ CSI-RS .

[0313] **In one example, or or or or

[0314] **In another example, or or

[0315] **In another example,

[0316] *In one example 5B-4, if the interval between the last symbol received of the non-periodic NZP-CSI-RS resource and the first symbol transmitted of the non-periodic SRS is less than Z×q OFDM symbols, the UE is not expected to update the SRS precoding information, where the parameter q is determined according to at least one of the following examples in embodiment 5B-3, and Z is fixed (e.g., 14, 28, 42, or 48) or is configured to the UE.

[0317] In the 3GPP NR specification, UL transmission is configured as codebook-based or non-codebook-based by setting the higher-layer parameter txConfig in PUSCH-Config to "codebook" or "nonCodebook".

[0318] According to the 3GPP NR specifications, codebook-based UL transmission supports the following. For codebook-based transmission, the UE determines the UE's codebook subset based on the TPMI and upon receiving the higher-layer parameter ULCodebookSubset or codebookSubset in PUSCH-Config, which can be configured as "fullAndPartialAndNonCoherent", "partialAndNonCoherent", or "nonCoherent" depending on the UE's capabilities. The maximum transmission rank can be configured by the higher-layer parameter ULmaxRank or maxRank in PUSCH-Config.

[0319] A UE that reports its UE capability as "partialAndNonCoherent" may not expect to be configured with ULCodebookSubset as "fullAndPartialAndNonCoherent".

[0320] A UE reporting its UE capability as "Non-Coherent" may not expect to be configured with ULCodebookSubset as "fullAndPartialAndNonCoherent" or "partialAndNonCoherent".

[0321] When two antenna ports are configured, the UE may not expect to be configured with the higher layer parameter ULCodebookSubset set to "partialAndNonCoherent".

[0322] In this disclosure, “fullAndPartialAndNonCoherent”, “partialAndNonCoherent” and “Non-Coherent” are referred to as three examples of coherence types / capabilities, where the term “coherent” implies a subset of antenna ports at the UE that can be used to coherently send a layer of UL data.

[0323] According to the NR specification, for non-codebook-based UL transmission, the precoding matrix W is equal to the identity matrix. For codebook-based UL transmission, for single-layer transmission on a single antenna port, the precoding matrix W is given by W = 1, otherwise it is given by Tables 3 to 8.

[0324] A subset of TPMI indices for the three coherence types is summarized in Tables 9 and 10, where rank = r corresponds to (and is equivalent to) r layers.

[0325] The rank (or number of layers) and the corresponding precoding matrix W are indicated to the UE using TRI and TPMI, respectively. In one example, this indication is combined via the "precoding information and number of layers" field in the DCI, for example, using DCI format 0_1. In another example, this indication is via higher-layer RRC signaling. In one example, the mapping between the "precoding information and number of layers" field and TRI / TPMI is performed according to NR.

[0326] The rank (or number of layers) and the corresponding precoding matrix W are indicated to the UE using TRI and TPMI, respectively. In one example, this indication is combined via the "precoding information and number of layers" field in the DCI, for example, using DCI format 0_1. In another example, this indication is via higher-layer RRC signaling. In one example, the mapping between the "precoding information and number of layers" field and TRI / TPMI is performed according to NR.

[0327] Table 3

[0328]

[0329] Table 4

[0330]

[0331] Table 5

[0332]

[0333] Table 6

[0334]

[0335] Table 7

[0336]

[0337] Table 8

[0338]

[0339] Table 9

[0340] rank Non-Coherent fullAndPartialAndNonCoherent 1 0-1 0-5 2 0 0-2

[0341] Table 10

[0342] rank Non-Coherent partialAndNonCoherent fullAndPartialAndNonCoherent 1 0-3 0-11 0-27 2 0-5 0-13 0-21 3 0 0-2 0-6 4 0 0-2 0-4

[0343] In one embodiment 6A1, the UE is configured with a low-resolution dual-stage codebook C1 for codebook-based UL transmission, wherein the codebook C1 includes a precoding matrix W=W1W2, where

[0344] *The first component W1 is a group of L precoders / beams / ports, and

[0345] *The second component W2 is the selection vector that selects 1 precoder / beam / port per layer (from the L precoders / beams / ports in W1), and if the UE antenna is dual-polarized, it may also select the in-phase value.

[0346] An example of such a codebook is the NR Type I CSI codebook.

[0347] In one embodiment 6A2, the UE is configured with a high-resolution dual-stage codebook C2 for codebook-based UL transmission, wherein the codebook C2 includes a precoding matrix W=W1W2, where

[0348] *The first component W1 is a group of L precoders / beams / ports, and

[0349] *The second component W2 is the combination vector of L precoders / beams / ports (in W1) per layer.

[0350] An example of such a codebook is the NR Type II CSI codebook. Another example of such a codebook is where W1 is a (potentially oversampled) DFT codebook and W2 is the NR UL codebook (all or a subset of the precoder / precoding matrix).

[0351] If the gNB indicates both W1 and W2 to the UE, at least one of the following alternatives is used for the indication.

[0352] *In one alternative, Alt 6A-1: Combined TPMI indications for both W1 and W2.

[0353] * In one alternative Alt 6A-2: Both W1 and W2 are indicated jointly with the SRI. If the number of SRS resources is > 1, the selected SRS resource(s) are also indicated jointly with the SRI.

[0354] *In one alternative Alt 6A-3: Joint SRI2 indication of both W1 and W2. If the number of SRS resources > 1, the selected SRS resource(s) are indicated via separate SRI indications.

[0355] *In one alternative Alt 6A-4: the first TPMI1 indicates W1, and the second TPMI2 indicates W2.

[0356] *In one alternative Alt 6A-5: TPMI indicates W1, and SRI indicates W2. If the number of SRS resources is > 1, the selected SRS resource(s) are also indicated jointly with the SRI.

[0357] *In one alternative Alt 6A-6: TPMI indicates W1, and SRI2 indicates W2. If the number of SRS resources is > 1, the selected SRS resource(s) are indicated via separate SRI indications.

[0358] *In one alternative Alt 6A-7: TPMI indicates W2, and SRI indicates W1. If the number of SRS resources > 1, the selected SRS resource(s) are also indicated jointly with the SRI.

[0359] *In one alternative Alt 6A-8: TPMI indicates W2, and SRI2 indicates W1. If the number of SRS resources > 1, the selected SRS resource(s) are indicated via separate SRI indications.

[0360] *In one alternative Alt 6A-9: the first SRI1 indicates W1, and the second SRI2 indicates W2. If the number of SRS resources > 1, the selected SRS resource(s) are also indicated jointly with SRI1 or SRI2.

[0361] *In one alternative Alt 6A-10: the first SRI1 indicates W1 and the second SRI2 indicates W2. If the number of SRS resources is > 1, the selected SRS resource(s) are indicated via separate SRI indications.

[0362] If the gNB indicates only W1 to the UE (e.g., when W2 is determined transparently by the UE), at least one of the following alternatives is used for the indication.

[0363] *In one alternative, Alt 6A-11: TPMI indicates W1.

[0364] * In one alternative Alt 6A-12: SRI indicates W1. If the number of SRS resources is > 1, then the selected SRS resource(s) are also indicated jointly with the SRI.

[0365] *In one alternative Alt 6A-13: SRI2 indicates W1. If the number of SRS resources > 1, the selected SRS resource(s) are indicated via separate SRI indications.

[0366] If the gNB indicates only W2 to the UE (e.g., when W1 is determined transparently by the UE), at least one of the following alternatives is used for indication.

[0367] *In one alternative, Alt 6A-14: TPMI indicates W2.

[0368] * In one alternative Alt 6A-15: SRI indicates W2. If the number of SRS resources is > 1, then the selected SRS resource(s) are also indicated jointly with the SRI.

[0369] *In one alternative Alt 6A-16: SRI2 indicates W2. If the number of SRS resources > 1, the selected SRS resource(s) are indicated via separate SRI indications.

[0370] W1 indication is per WB, i.e., a single W1 is indicated for all scheduled PRBs / SBs commonly used for UL transmission. On the other hand, W2 indication can be per WB or per SB, i.e., one W2 is indicated for each scheduled PRB / SB.

[0371] The W1 indication may be via UL-related DCI (e.g., DCI format 0_1 ​​in NR). Alternatively, the W1 indication may be via higher layer (e.g., RRC) signaling.

[0372] Alternatively, the W1 indication is via PDSCH. Similarly, the W2 indication may be via UL-related DCI (e.g., DCI format 0_1 ​​in NR). Alternatively, the W2 indication may be via higher layer (e.g., RRC) signaling. Alternatively, the W2 indication is via PDSCH.

[0373] In one alternative, the value L in the UL codebook (C1 and C2) is fixed, e.g., for C1, L = 1, and for C2, L = 2. In another alternative, the value L in the UL codebook (C1 and C2) is configured, e.g., according to {1, 2} (e.g., via higher-layer RRC signaling).

[0374] In one example, when L=1 for C1, the UL codebook is the same as the NR Type I codebook of Codebook-Config 1.

[0375] In one example, when L=2 for C2, the UL codebook is the same as the Rel.15 Type II codebook, except that there may be some additional restrictions, such as one or any combination of the following restrictions.

[0376] *W2 only includes the coefficient phase, where the phase codebook is fixed to QPSK (2 bits per coefficient). The coefficient amplitude is assumed to be unity.

[0377] *W2 only includes the coefficient phase, where the phase codebook can be configured according to QPSK (2 bits) and 8PSK (3 bits). The coefficient amplitude is assumed to be one.

[0378] *W2 includes coefficient phase and coefficient amplitude, where the phase codebook is fixed to QPSK (2 bits per coefficient) and the coefficient amplitude is fixed to (2 bits).

[0379] *W2 includes coefficient phase and coefficient amplitude, where the phase codebook can be configured according to QPSK (2 bits) and 8PSK (3 bits), and the coefficient amplitude is fixed to (2 bits).

[0380] *W2 includes coefficient phase and coefficient amplitude, where the phase codebook is fixed to QPSK (2 bits per coefficient) and the coefficient amplitude is fixed to the WB amplitude codebook in the Rel.15 Type II codebook.

[0381] *W2 includes coefficient phase and coefficient amplitude, where the phase codebook can be configured according to QPSK (2 bits) and 8PSK (3 bits), and the coefficient amplitude is fixed to the WB amplitude codebook in the Rel.15 type II codebook.

[0382] *Only rank 1 is supported.

[0383] Figure 11 A method of a partial reciprocity based scheme 1100 according to an embodiment of the present disclosure is illustrated. Figure 11 The illustrated embodiment of the partial reciprocity based scheme 1100 is for illustration only. Figure 11 The scope of this disclosure is not limited to any particular implementation of the partial reciprocity based scheme 1100 .

[0384] In one embodiment 7, the UE is configured with Figure 11 The codebook-based UL transmission method shown in FIG. Figure 11 As shown, the UE receives a high-level configuration to send N SRS≥1 SRS resource. In response, the UE sends SRS resources according to the configuration. The gNB measures these SRS resources, estimates the UL channel based on the SRS measurements, and then determines / calculates W1 (indicating the precoder / beam group). The UE receives an indication of W1 (from the gNB). The UE next receives a configuration regarding CSI-RS measurements (for W2 calculation). The UE receives / measures the CSI-RS, estimates the DL channel, and (assuming reciprocity) uses it as the UL channel for W2 calculation. The UE ultimately sends the UL transmission using the precoder / precoding matrix W = W1W2, where W1 is indicated by the gNB and W2 is determined by the UE. Since W2 is transparent to the gNB / NW, the UE can calculate W2 for each scheduled PRB / SB used for the UL transmission, i.e., UL precoding can be applied on a per-PRB / SB basis.

[0385] Since W1 is the WB component of the precoding matrix W, it can be indicated via higher layer (e.g., RRC) signaling. Alternatively, W1 is indicated via UL-related DCI (e.g., DCI format 0_1 ​​in NR). Similarly, W1 indication can be via a separate UL-related DCI parameter. Alternatively, the indication can be via an existing UL-related DCI parameter, such as TPMI or SRI.

[0386] The W1 indication may correspond to a fixed rank (sent rank indicator or TRI) value, such as rank 1. Alternatively, the rank (TRI) value may be indicated jointly with the W1 indication. Alternatively, the rank (TRI) value may be indicated separately from the W1 indication. In the latter case, at least one of the following indication alternatives may be used.

[0387] *In an alternative solution Alt 7-1: W1 indication is via higher layer signaling, and TRI indication is via DCI. Their corresponding indications are jointly using existing parameters or separately using new parameters.

[0388] *In an alternative solution Alt 7-2: W1 indication is via DCI, and TRI indication is via higher layer signaling. Their corresponding indications are jointly using existing parameters or separately using new parameters.

[0389] *In one alternative Alt 7-3: Both W1 indication and TRI indication are via DCI, jointly using a single parameter or separately using two parameters.

[0390] *In one alternative Alt 7-4: both the W1 indication and the TRI indication are signaled via higher layers, jointly using a single parameter or separately using two parameters.

[0391] The W2 calculation at the UE follows the rank indicated via the TRI or has a fixed rank (eg, rank 1). Alternatively, the TRI is indicated via higher layer signaling and W1 and W2 are calculated / indicated accordingly.

[0392] Other UL-related parameters (such as MCS) may be indicated jointly with the W1 indication, or via separate indications (eg, via DCI).

[0393] SRS and CSI-RS resources may be linked (or associated with each other) via higher-level configuration of parameters such as associatedSRS in a CSI-RS-ResourceSet for CSI-RS resources and associatedCSI-RS in an SRS-ResourceSet for SRS resources.

[0394] Figure 12 Another method of a partial reciprocity based scheme 1200 according to an embodiment of the present disclosure is illustrated. Figure 12 The illustrated embodiment of the partial reciprocity based scheme 1200 is for illustration only. Figure 12 The scope of this disclosure is not limited to any particular implementation of the partial reciprocity based scheme 1200 .

[0395] In one embodiment 7A, Figure 12 As shown, which is a variation of embodiment 7, the UE is further configured to send W2 to the gNB, which uses W2 to determine parameters such as the MCS for UL transmission, assuming W = W1W2 as the UL precoder / precoding matrix. The UE receives the MCS (e.g., via UL-related DCI) and transmits UL data accordingly.

[0396] Figure 13 Yet another method of a partial reciprocity based scheme 1300 according to an embodiment of the present disclosure is illustrated. Figure 13 The illustrated embodiment of the partial reciprocity based scheme 1300 is for illustration only. Figure 13 The scope of this disclosure is not limited to any particular implementation of the partial reciprocity based scheme 1300 .

[0397] In one embodiment 8, Figure 13 As shown, the UE is configured with codebook-based UL transmission. The UE receives (e.g., via higher layer signaling) configuration regarding CSI-RS measurement (for W1 calculation). The UE receives / measures CSI-RS, estimates the DL channel, and (assuming reciprocity) uses it as the UL channel for W1 calculation. The calculated W1 is used to precode N SRS≥ 1 SRS resource, whose configuration is received by the UE via higher-layer signaling, either jointly with or separately from the CSI-RS configuration. The UE transmits SRS resources (precoded with W1) according to the configuration. The gNB measures these SRS resources, estimates the UL channel based on the SRS measurements, and then determines / calculates the W2 component of the UL precoder. The UE receives an indication of W2 (from the gNB). The UE ultimately transmits the UL transmission using the precoder / precoding matrix W = W1W2, where W2 is indicated by the gNB (hence, it is non-transparent) and W1 is determined by the UE (hence, it is transparent).

[0398] The W2 indication can be WB, i.e., a single W2 is indicated for all scheduled PRBs / SBs used for UL transmission. Alternatively, the gNB / NW can calculate W2 for each scheduled PRB / SB used for UL transmission, i.e., UL precoding can be applied on a per-PRB / SB basis.

[0399] Using multiple precoding SRS resources (precoded with W1 derived based on CSI-RS measurements) may be used, for example, to capture the UL channel rank space or avoid the UL channel null space.

[0400] Zero X = the number of precoders / beams in W1.

[0401] In a sub-embodiment 8-1, N SRS =X, and each SRS resource includes 1 port. W2 uses the high-resolution codebook C2 in embodiment A2. W2 indicates for each layer the precoder that combines all X SRS ports (equivalently, all precoders / beams in W1).

[0402] In a sub-embodiment 8-2, N SRS = 1, and the SRS resource includes X ports. W2 uses W2 of the high-resolution codebook C2 in embodiment A2 to indicate the precoder that combines all X SRS ports (equivalently, all precoders / beams in W1) for each layer.

[0403] In a sub-embodiment 8-3, N SRS =Y, and each SRS resource includes X / Y ports. W2 uses the high-resolution codebook C2 in embodiment A2 to indicate the precoder that combines all X SRS ports (equivalently, all precoders / beams in W1) for each layer.

[0404] In a sub-embodiment 8-4, N SRS=X, and each SRS resource includes 1 port. W2 uses W2 of the low-resolution codebook C1 in embodiment A1 to indicate a precoder for each layer to select 1 from the X SRS ports (equivalently, 1 precoder / beam in W1).

[0405] In a sub-embodiment 8-5, N SRS = 1, and the SRS resource includes X ports. W2 uses W2 of the low-resolution codebook C1 in embodiment A1 to indicate for each layer the precoder that selects 1 from the X SRS ports (equivalently, 1 precoder / beam in W1).

[0406] In a sub-embodiment 8-6, N SRS =Y, and each SRS resource includes X / Y ports. W2 uses W2 of the low-resolution codebook C1 in embodiment A1 to indicate a precoder for each layer to select 1 from the X SRS ports (equivalently, 1 precoder / beam in W1).

[0407] The W2 indication is according to one of Alt 6A-14, Alt 6A-15, and Alt 6A-16. Alternatively, a generalized (joint) SRI can be used to indicate both the W2 of the selected SRS resource and the SRS resource selection. That is, this generalized SRI essentially serves as the TPMI across the selected SRS resources. Alternatively, a generalized (joint) TPMI can be used to indicate both the W2 of the selected SRS resource and the SRS resource selection. That is, this generalized TPMI essentially serves as the TPMI across the selected SRS resources. Alternatively, the SRI can be used to indicate the SRS resource selection, and the TPMI can be used to indicate the W2 of the selected SRS resource.

[0408] The W2 indication may correspond to a fixed rank (transmitted rank indicator or TRI) value, such as rank 1. Alternatively, the rank (TRI) value may be indicated jointly with the W2 indication. Alternatively, the rank (TRI) value may be indicated separately from the W1 indication. In the latter case, at least one of the following indication alternatives may be used.

[0409] *In an alternative solution Alt 8-1: W2 indication is via higher layer signaling, and TRI indication is via DCI. Their corresponding indications are jointly using existing parameters or separately using new parameters.

[0410] *In an alternative solution Alt 8-2: W2 indication is via DCI, and TRI indication is via higher layer signaling. Their respective indications are made jointly using existing parameters or separately using new parameters.

[0411] *In one alternative Alt 8-3: Both W2 indication and TRI indication are via DCI, jointly using a single parameter or separately using two parameters.

[0412] *In an alternative Alt 8-4: both the W2 indication and the TRI indication are signaled via higher layer jointly using a single parameter or separately using two parameters.

[0413] The calculation of W1 at the UE has a fixed rank (eg, rank 1). Alternatively, the TRI is indicated via higher layer signaling, and W1 and W2 are calculated / indicated accordingly.

[0414] SRS and CSI-RS resources may be linked (or associated with each other) via higher-level configuration of parameters such as associatedSRS in CSI-RS-ResourceSet for CSI-RS resources and associatedCSI-RS in SRS-ResourceSet for SRS resources.

[0415] In one embodiment 8A (a variant of embodiment 8), the UE is further configured to send W1 to the gNB and SRS resources (not precoded with W1), which the gNB and SRS resources use to determine parameters such as the MCS for UL transmissions, assuming W = W1W2 as the UL precoder / precoding matrix. The UE receives the MCS (e.g., via UL-related DCI) and transmits UL data accordingly.

[0416] Figure 14 Yet another method of a partial reciprocity based scheme 1400 according to an embodiment of the present disclosure is illustrated. Figure 14 The illustrated embodiment of the partial reciprocity based scheme 1400 is for illustration only. Figure 14 The scope of this disclosure is not limited to any particular implementation of the partial reciprocity based scheme 1400 .

[0417] In one embodiment 9, Figure 14 As shown, the UE is configured with codebook-based UL transmission. The UE receives a high-level configuration for a first SRS transmission, the first SRS transmission including N SRS,1 ≥ 1 SRS resource. In response, the UE sends a first SRS resource according to the configuration. The gNB measures these SRS resources, estimates the UL channel based on the SRS measurements, and then determines / calculates W1 (indicating the group of precoders / beams). The UE receives an indication of W1 (from the gNB). The UE also receives a higher-layer configuration for a second SRS transmission, which includes N in conjunction with or separate from the first SRS configuration. SRS,2≥ 1 SRS resource. The UE transmits a second SRS resource (precoded with W1) according to the configuration. The gNB measures these SRS resources, estimates the UL channel based on the SRS measurements, and then determines / calculates the W2 component of the UL precoder. The UE receives an indication of W2 (from the gNB). The UE ultimately transmits the UL transmission using the precoder / precoding matrix W = W1W2.

[0418] The first SRS resource may or may not be precoded, but the second SRS resource is precoded based on W1 (eg, via TPMI1).The rank (TRI) indication may be according to at least one of the following alternatives.

[0419] In an alternative Alt 9-1 (with W1): TRI is indicated jointly or separately with W1 (eg, via TPMI1). W2 indication follows the rank indicated via TRI or has a fixed rank (eg, rank 1).

[0420] In an alternative Alt 9-2 (with W2): TRI is indicated jointly or separately with W2 (eg, via TPMI2). W1 indication may adopt a fixed rank (eg, rank 1).

[0421] In an alternative Alt 9-3 (case with both W1 and W2): both TRI1 and TRI2 are indicated.

[0422] *TRI1 and W1 indicate combined or separate instructions.

[0423] *TRI2 and W2 indicate combined or separate instructions.

[0424] Figure 15 A flow chart illustrating a method 1500 for operating a user equipment (UE) for aperiodic channel state information reference signal (CSI-RS) reception according to an embodiment of the present disclosure, which may be performed by a UE such as UE 116, is shown. Figure 15 The illustrated embodiment of method 1500 is for illustration only. Figure 15 The scope of the present disclosure is not limited to any particular implementation.

[0425] like Figure 15 As shown, the method 1500 starts at step 1502. In step 1502, the UE (e.g., Figure 1 111-116) shown receive aperiodic CSI-RS configuration information including CSI-RS triggering offset.

[0426] In step 1504, the UE receives downlink control information (DCI) via a physical downlink control channel (PDCCH), wherein the DCI triggers an aperiodic CSI-RS.

[0427] In step 1506, the UE determines the CSI-RS triggering offset based on the CSI-RS configuration information. PDCCH <μ CSIRS When the CSI-RS triggering offset is configured according to the first set, and when μ PDCCH >μ CSIRS When CSI-RS triggering offset is configured according to the second set, μ PDCCH and μ CSIRS They are the subcarrier spacing configurations of PDCCH and aperiodic CSI-RS respectively.

[0428] In step 1508, the UE selects the time slot containing the triggered DCI and the subcarrier spacing configuration (μ PDCCH and μ CSIRS ) Determined time slot K s Receive aperiodic CSI-RS.

[0429] In one embodiment, the first set is {0, 1, 2, .....31} and the second set is {0, 1, 2, 3, 4, 16, 24}.

[0430] In one embodiment, the time slot Where n is the time slot containing the triggering DCI, x is the CSI-RS triggering offset, and is the floor function

[0431] In one embodiment, the processor is further configured to determine a starting orthogonal frequency division multiplexing (OFDM) symbol for aperiodic CSI-RS reception, and the transceiver is further configured to start aperiodic CSI-RS reception from the starting OFDM symbol. PDCCH <μ CSIRS , determine the starting OFDM symbol so that CSI-RS reception starts no earlier than the first OFDM symbol of the CSI-RS slot, and the first OFDM symbol of the CSI-RS slot starts at least Δ PDCCH symbols after the end of the PDCCH that triggers the aperiodic CSI-RS. PDCCH >μ CSIRS , determining the starting OFDM symbol so that CSI-RS reception starts no earlier than at least Δ PDCCH symbols after the PDCCH that triggers the aperiodic CSI-RS ends.

[0432] In one embodiment, when μ PDCCHWhen Δ=0 indicates a subcarrier spacing of 15 kHz, Δ=4.

[0433] In one embodiment, the processor is further configured to determine a quasi-co-located (QCL) hypothesis for aperiodic CSI-RS reception based on a condition of a scheduling offset δ between the last symbol of the PDCCH that triggers the aperiodic CSI-RS and the first symbol of the aperiodic CSI-RS, wherein the condition is given by: when δ<α, if the PDSCH is received in the same OFDM symbol as the aperiodic CSI-RS, then the QCL hypothesis is a QCL hypothesis for the PDSCH, and otherwise when δ≥α, as indicated via the PDCCH that triggers the aperiodic CSI-RS, then the QCL hypothesis is a QCL hypothesis for the PDCCH. The transceiver is further configured to apply the determined QCL hypothesis to the aperiodic CSI-RS reception, wherein α is a threshold and the QCL hypothesis corresponds to QCL-Type D indicating a beam for receiving the aperiodic CSI-RS.

[0434] In one embodiment, the threshold where Y is the threshold beamSwitchTiming reported by the UE, Y is taken from the set consisting of {14, 28, 48}, and where d is the additional delay such that when μ PDCCH ≥μ CSIRS When d=0, and when μ PDCCH <μ CSIRS When d=m.

[0435] In one embodiment, when μ PDCCH =0 indicates a 15kHz subcarrier spacing, m = 4; when μ PDCCH =1 indicates a subcarrier spacing of 30kHz, m=4; and when μ PDCCH =2 indicates a subcarrier spacing of 60 kHz, and m=8.

[0436] Figure 16 A flow chart illustrating another method 1600 according to an embodiment of the present disclosure is shown, which may be performed by a base station (BS), such as BS 102 . Figure 16 The embodiment of method 1600 shown in FIGURE 1 is for illustration only. Figure 16 The scope of the present disclosure is not limited to any particular implementation.

[0437] like Figure 16 As shown, the method 1600 starts at step 1602. In step 1602, the BS (e.g., Figure 1 101-103) shown generate aperiodic channel state information reference signal (CSI-RS) configuration information and downlink control information (DCI).

[0438] In step 1604, the BS transmits aperiodic CSI-RS configuration information including a CSI-RS triggering offset.

[0439] In step 1606, the BS transmits DCI via a physical downlink control channel (PDCCH), wherein the DCI triggers an aperiodic CSI-RS.

[0440] In step 1608, the BS s Aperiodic CSI-RS is sent in .

[0441] When μ PDCCH <μ CSIRS When the CSI-RS triggering offset is configured according to the first set, and when μ PDCCH >μ CSIRS When CSI-RS triggering offset is configured according to the second set, μ PDCCH and μ CSIRS The subcarrier spacing configurations of PDCCH and aperiodic CSI-RS are respectively. Based on CSI-RS trigger offset, time slot containing triggering DCI and subcarrier spacing configuration (μ PDCCH and μ CSIRS ) Determine time slot K s .

[0442] In one embodiment, the first set is {0, 1, 2, .....31} and the second set is {0, 1, 2, 3, 4, 16, 24}.

[0443] In one embodiment, the time slot Where n is the time slot containing the triggering DCI, x is the CSI-RS triggering offset, and is the floor function.

[0444] In one embodiment, a starting orthogonal frequency division multiplexing (OFDM) symbol for aperiodic CSI-RS reception is determined based on the CSI-RS configuration information, and aperiodic CSI-RS reception is started from the starting OFDM symbol. PDCCH <μ CSIRS , determine the starting OFDM symbol so that CSI-RS reception starts no earlier than the first OFDM symbol of the CSI-RS slot, and the first OFDM symbol of the CSI-RS slot starts at least Δ PDCCH symbols after the end of the PDCCH that triggers the aperiodic CSI-RS. PDCCH >μ CSIRS , determining the starting OFDM symbol so that CSI-RS reception starts no earlier than at least Δ PDCCH symbols after the PDCCH that triggers the aperiodic CSI-RS ends.

[0445] In one embodiment, when μ PDCCH When Δ=0 indicates a subcarrier spacing of 15 kHz, Δ=4.

[0446] A quasi-co-location (QCL) assumption for reception of the aperiodic CSI-RS is determined based on a condition of a scheduling offset δ between the last symbol of the PDCCH that triggers the aperiodic CSI-RS and the first symbol of the aperiodic CSI-RS, wherein the condition is given by: when δ<α, if the PDSCH is received in the same OFDM symbol as the aperiodic CSI-RS, the QCL assumption is the QCL assumption for the PDSCH, otherwise when δ≥α, the QCL assumption is indicated via the PDCCH that triggers the aperiodic CSI-RS, then the QCL assumption is the QCL assumption for the PDCCH; and the determined QCL assumption for reception of the aperiodic CSI-RS is applied, where α is a threshold and the QCL assumption corresponds to QCL-TypeD indicating the beam for receiving the aperiodic CSI-RS.

[0447] In one embodiment, the threshold where Y is the threshold beamSwitchTiming reported by the UE, Y is taken from the set consisting of {14, 28, 48}, and where d is the additional delay such that when μ PDCCH ≥μ CSIRS When d=0, and when μ PDCCH <μ CSIRS When d=m.

[0448] In one embodiment, when μ PDCCH When m=0 indicates a subcarrier spacing of 15 kHz, m=4.

[0449] When μ PDCCH =1 indicates a subcarrier spacing of 30kHz, m=4; and when μ PDCCH =2 indicates a subcarrier spacing of 60 kHz, and m=8.

[0450] Although the present disclosure has been described using exemplary embodiments, various variations and modifications may occur to those skilled in the art. The present disclosure is intended to encompass such variations and modifications as fall within the scope of the appended claims. Nothing in this application should be construed as implying that any particular element, step, or function is essential to the scope of the claims. The scope of the subject matter of a patent is defined by the claims.

Claims

1. A terminal in a wireless communication system, the terminal comprising: a transceiver configured to transmit and receive signals; as well as a controller coupled to the transceiver and configured to: receiving a radio resource control (RRC) message from a base station, wherein the RRC message includes configuration information about a channel state information reference signal (CSI-RS) resource, wherein the configuration information includes an aperiodic trigger offset X in units of time slots; receiving a physical downlink control channel PDCCH from the base station in a first time slot n1, the PDCCH triggering reported aperiodic channel state information CSI, and receiving an aperiodic CSI-RS in a second time slot n2 from the base station based on the configuration information and the PDCCH, Among them, the subcarrier spacing configuration μ of the PDCCH PDCCH The subcarrier spacing configuration μ of the aperiodic CSI-RS CSI-RS Different from each other, wherein the second time slot is identified based on the first time slot and the aperiodic trigger offset, and The second time slot n2 is identified as a time slot where X is the μ CSI-RS middle.

2. The terminal according to claim 1, in, The non-periodic trigger offset X is based on the μ PDCCH and the μ CSI-RS Sure, Among them, in the μ PDCCH Greater than the μ CSI-RS In the case of , the non-periodic trigger offset X is a value from the first set {0, 1, 2, 3, 4, 16, 24}, and Among them, in the μ PDCCH Smaller than μ CSI-RS In the case of , the non-periodic trigger offset X is a value from the second set {0, 1, 2, ..., 31}.

3. The terminal according to claim 1, in, The controller is further configured to PDCCH and the μ CSI-RS measuring the aperiodic CSI-RS, Wherein, the controller is configured as follows: In the μ PDCCH Greater than the μ CSI-RS In the case of measuring at least N from the last symbol of the PDCCH CSIRS symbols later, and In the μ PDCCH Smaller than μ CSI-RS In the case of measuring the aperiodic CSI-RS received in the time slot n2, in which the first symbol is from the at least N last symbol of the PDCCH CSIRS After the symbol, where N CSIRS is based on the μ PDCCH The number of symbols identified. The terminal according to claim 1 , wherein: The controller is further configured to: Identify whether the scheduling offset between the last symbol of the PDCCH and the first symbol of the aperiodic CSI-RS is less than the value based on μ PDCCH The threshold value of the identification, and Based on the quasi-co-located QCL assumption, receiving the aperiodic CSI-RS, wherein the QCL hypothesis is identified based on the result of the identification, and Wherein, the threshold is in the μ CSI-RS Identified as where Y is a terminal-reported parameter associated with a beam switching opportunity, which is a value from {14, 28, 48}, and where m is based on μ PDCCH Identifies the delay parameter.

5. A base station in a wireless communication system, the base station comprising: a transceiver configured to transmit and receive signals; as well as a controller coupled to the transceiver and configured to: Sending a radio resource control (RRC) message to the terminal, wherein the RRC message includes configuration information about a channel state information reference signal (CSI-RS) resource, wherein the configuration information includes an aperiodic trigger offset X in units of time slots, Sending a physical downlink control channel PDCCH to the terminal in a first time slot n1, wherein the PDCCH triggers reporting of aperiodic channel state information CSI, and Based on the configuration information and the PDCCH, an aperiodic CSI-RS in a second time slot n2 is sent to the terminal, Among them, the subcarrier spacing configuration μ of the PDCCH PDCCH The subcarrier spacing configuration μ of the aperiodic CSI-RS CSI-RS Different from each other, wherein the second time slot is identified based on the first time slot and the aperiodic trigger offset, and The second time slot n2 is identified as a time slot where X is the μ CSI-RS middle. The base station according to claim 5 , in, The non-periodic trigger offset X is based on the μ PDCCH and the μ CSI-RS Sure, Among them, in the μ PDCCH Greater than the μ CSI-RS In the case of , the non-periodic trigger offset X is a value from the first set {0, 1, 2, 3, 4, 16, 24}, and Among them, in the μ PDCCH Smaller than μ CSI-RS In the case of , the non-periodic trigger offset X is a value from the second set {0, 1, 2, ..., 31}.

7. The base station according to claim 5, in, The aperiodic CSI-RS is based on the μ PDCCH and the μ CSI-RS measured, Among them, in the μ PDCCH Greater than the μ CSI-RS In the case of measuring at least N from the last symbol of the PDCCH CSIRS symbols later, and Among them, in the μ PDCCH Smaller than μ CSI-RS In the case of measuring the aperiodic CSI-RS sent in the time slot n2, in the time slot n2, the first symbol is from the at least N last symbol of the PDCCH CSIRS After the symbol, where N CSIRS is based on the μ PDCCH The number of symbols identified.

8. The base station according to claim 5, in, The aperiodic CSI-RS is sent based on a quasi-co-located QCL assumption, Wherein, whether the scheduling offset between the last symbol of the PDCCH and the first symbol of the aperiodic CSI-RS is less than the μ PDCCH Identify the threshold, identify the QCL assumption, and Wherein, the threshold is in the μ CSI-RS Identified as where Y is a terminal-reported parameter associated with a beam switching opportunity, which is a value from {14, 28, 48}, and where m is based on μ PDCCH Identifies the delay parameter.

9. A method performed by a terminal in a wireless communication system, the method comprising: receiving a radio resource control (RRC) message from a base station, wherein the RRC message includes configuration information about a channel state information reference signal (CSI-RS) resource, wherein the configuration information includes an aperiodic trigger offset X in units of time slots; receiving a physical downlink control channel PDCCH from the base station in a first time slot n1, the PDCCH triggering reported aperiodic channel state information CSI, and receiving an aperiodic CSI-RS in a second time slot n2 from the base station based on the configuration information and the PDCCH, Among them, the subcarrier spacing configuration μ of the PDCCH PDCCH The subcarrier spacing configuration μ of the aperiodic CSI-RS CSI-RS Different from each other, wherein the second time slot is identified based on the first time slot and the aperiodic trigger offset, and The second time slot n2 is identified as a time slot where X is the μ CSI-RS middle.

10. The method according to claim 9, in, The non-periodic trigger offset X is based on the μ PDCCH and the μ CSI-RS Sure, Among them, in the μ PDCCH Greater than the μ CSI-RS In the case of , the non-periodic trigger offset X is a value from the first set {0, 1, 2, 3, 4, 16, 24}, and Among them, in the μ PDCCH Smaller than μ CSI-RS In the case of , the non-periodic trigger offset X is a value from the second set {0, 1, 2, ..., 31}.

11. The method according to claim 9, further comprising: PDCCH and the μ CSI-RS measuring the aperiodic CSI-RS, in, The measurements include: In the μ PDCCH Greater than the μ CSI-RS In the case of measuring at least N from the last symbol of the PDCCH CSIRS symbols later, and In the μ PDCCH Smaller than μ CSI-RS In the case of measuring the aperiodic CSI-RS received in the time slot n2, in which the first symbol of the at least N CSIRS After the symbol, where N CSIRS is based on the μ PDCCH The number of symbols identified.

12. The method according to claim 9, in, The receiving the aperiodic CSI-RS includes: Identify whether the scheduling offset between the last symbol of the PDCCH and the first symbol of the aperiodic CSI-RS is less than the value based on μ PDCCH The threshold value of the identification, and Based on the quasi-co-located QCL assumption, receiving the aperiodic CSI-RS, wherein the QCL hypothesis is identified based on the result of the identification, and Wherein, the threshold is in the μ CSI-RS Identified as where Y is a parameter reported by the terminal associated with the beam switching opportunity, Y is a value from {14, 28, 48}, and where m is based on μ PDCCH Identifies the delay parameter.

13. A method performed by a base station in a wireless communication system, the method comprising: Sending a radio resource control (RRC) message to the terminal, wherein the RRC message includes configuration information about a channel state information reference signal (CSI-RS) resource, wherein the configuration information includes an aperiodic trigger offset X in units of time slots, Sending a physical downlink control channel PDCCH to the terminal in a first time slot n1, wherein the PDCCH triggers reporting of aperiodic channel state information CSI, and Based on the configuration information and the PDCCH, an aperiodic CSI-RS in a second time slot n2 is sent to the terminal, Among them, the subcarrier spacing configuration μ of the PDCCH PDCCH The subcarrier spacing configuration μ of the aperiodic CSI-RS CSI-RS Different from each other, wherein the second time slot is identified based on the first time slot and the aperiodic trigger offset, and The second time slot n2 is identified as a time slot where X is the μ CSI-RS middle.

14. The method according to claim 13, in, The non-periodic trigger offset X is based on the μ PDCCH and the μ CSI-RS Sure, Among them, in the μ PDCCH Greater than the μ CSI-RS In the case of the non-periodic trigger offset X is a value from the first set {0, 1, 2, 3, 4, 16, 24}, Among them, in the μ PDCCH Smaller than μ CSI-RS In the case of , the non-periodic trigger offset X is a value from the second set {0, 1, 2, ..., 31}, Wherein, the non-periodic CSI-RS is based on the μ PDCCH and the μ CSI-RS measured, Among them, in the μ PDCCH Greater than the μ CSI-RS In the case of measuring at least N from the last symbol of the PDCCH CSIRS symbols later, and Among them, in the μ PDCCH Smaller than μ CSI-RS In the case of measuring the aperiodic CSI-RS sent in the time slot n2, in the time slot n2, the first symbol is from the at least N last symbol of the PDCCH CSIRS After the symbol, where N CSIRS is based on the μ PDCCH The number of symbols identified.

15. The method according to claim 13, in, The aperiodic CSI-RS is sent based on a quasi-co-located QCL assumption, Wherein, whether the scheduling offset between the last symbol of the PDCCH and the first symbol of the aperiodic CSI-RS is less than the μ PDCCH Identify the threshold, identify the QCL assumption, and Wherein, the threshold is in the μ CSI-RS Identified as where Y is a parameter reported by the terminal associated with the beam switching opportunity, Y is a value from {14, 28, 48}, and Wherein, m is based on the μ PDCCH Identifies the delay parameter.

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