CN117063517A

CN117063517A - Method and apparatus for configuring CSI reporting granularity

Info

Publication number: CN117063517A
Application number: CN202280024125.0A
Authority: CN
Inventors: M·S·拉赫曼; E·昂戈萨努西
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2021-03-25
Filing date: 2022-03-25
Publication date: 2023-11-14

Abstract

The present disclosure relates to 5G or 6G communication systems for supporting high data transmission rates. The present disclosure includes a method performed by a User Equipment (UE), the method comprising receiving a configuration for a Channel State Information (CSI) report, the configuration comprising a CSI-RS burst for B > 1 time instances including CSI reference signal, CSI-RS, transmission and comprising N _ST Information of Time Domain (TD) units of successive time instances; measuring a CSI-RS burst; determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit; and transmitting a CSI report including an indication of TD or DD components for a DL channelAnd (5) notifying.

Description

Method and apparatus for configuring CSI reporting granularity

Technical Field

The present disclosure relates generally to wireless communication systems, and more particularly, to configuring CSI reporting granularity.

Background

The 5G mobile communication technology defines a wide frequency band, enabling high transmission rates and new services, and can be implemented not only in a "below 6 GHz" band such as 3.5GHz, but also in a "above 6 GHz" band called millimeter wave (mmWave) including 28GHz and 39 GHz. Further, in order to achieve a transmission rate 50 times faster than that of the 5G mobile communication technology and an ultra-low latency of one tenth of that of the 5G mobile communication technology, it has been considered to implement the 6G mobile communication technology (referred to as transcendental 5G system) in a terahertz band (e.g., 95GHz to 3THz band).

In the early stages of the development of 5G Mobile communication technology, in order to support services and meet performance requirements related to enhanced Mobile BroadBand (eMBB), ultra-reliable low latency communication (Ultra Reliable Low Latency Communications, URLLC), and large-scale Machine-type communication (emtc), standardization is underway with respect to the following technologies: beamforming and massive MIMO for reducing radio wave path loss and increasing radio wave transmission distance in millimeter waves, supporting dynamic operation of parameter sets (e.g., operating a plurality of subcarrier intervals) and slot formats for effectively utilizing millimeter wave resources, initial access techniques for supporting multi-beam transmission and broadband, definition and operation of BWP (bandwidth part), new channel coding methods such as LDPC (low density parity check) codes for mass data transmission and polarization codes for highly reliable transmission of control information, L2 preprocessing, and network slicing for providing a dedicated network dedicated to a specific service.

Currently, in view of services that the 5G mobile communication technology will support, discussions are being made about improvement and performance enhancement of the initial 5G mobile communication technology, and physical layer standards have existed about various technologies such as the following: V2X (vehicle versus everything) for assisting driving determination of an autonomous vehicle based on information sent by the vehicle about the position and status of the vehicle and for enhancing user convenience, NR-U (new radio unlicensed) for system operation meeting various regulatory-related requirements in unlicensed bands, NR UE power saving, non-terrestrial network (Non-Terrestrial Network, NTN), which is UE-satellite direct communication for providing coverage in areas where communication with the terrestrial network is unavailable, and positioning.

Further, in terms of air interface architecture/protocols, standardization is underway with respect to various technologies such as: industrial internet of things (Industrial Internet of Things, IIoT) for supporting new services through interworking and convergence with other industries, IAB (integrated access and backhaul) for providing nodes for network service area extension by supporting wireless backhaul links and access links in an integrated manner, mobility enhancements including conditional handover and DAPS (dual active protocol stack) handover, and two-step random access (2-step RACH of NR) for simplifying random access procedures. Standardization is also underway in terms of system architecture/services with respect to techniques for: a 5G baseline architecture (e.g., service-based architecture or service-based interface) combining network function virtualization (Network Functions Virtualization, NFV) and Software Defined Networking (SDN) technologies, and mobile edge computing (Mobile Edge Computing, MEC) for receiving services based on UE location.

With commercialization of the 5G mobile communication system, exponentially growing connected devices will be connected to the communication network, and thus, it is expected that enhanced functions and performance of the 5G mobile communication system and integrated operation of the connected devices will be necessary. For this reason, new studies related to the following technologies are planned: new researches on augmented Reality (XR) for effectively supporting AR (augmented Reality), VR (virtual Reality), MR (mixed Reality), etc. have been made by using 5G performance improvement and complexity reduction of artificial intelligence (Artificial Intelligence, AI) and Machine Learning (ML), AI service support, meta space service support, and unmanned aerial vehicle communication.

Further, such development of the 5G mobile communication system will be the basis for developing not only new waveforms for providing coverage in the terahertz band of the 6G mobile communication technology, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas and massive antennas, metamaterial-based lenses and antennas for improving terahertz band signal coverage, high-dimensional spatial multiplexing technology using OAM (orbital angular momentum) and RIS (reconfigurable intelligent surface), but also full duplex technology for improving frequency efficiency of the 6G mobile communication technology and improving system network, AI-based communication technology for realizing system optimization by utilizing satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end support functions, and next generation distributed computing technology for realizing a service of a complexity degree exceeding the UE operation capability limit by utilizing ultra-high performance communication and computing resources.

Understanding and properly estimating the channel between the user equipment UE and the base station BS (e.g., a gNode B (gNB)) is important for efficient and effective wireless communication. To properly estimate DL channel conditions, the gNB may send reference signals (e.g., CSI-RS) to the UE for DL channel measurements, and the UE may report (e.g., feedback) information (e.g., CSI) about the channel measurements to the gNB. With this DL channel measurement, the gNB can select appropriate communication parameters to efficiently and effectively perform wireless data communication with the UE.

Disclosure of Invention

Technical problem

Embodiments of the present disclosure provide methods and apparatus capable of configuring CSI reporting granularity.

Technical proposal

In one embodiment, a UE in a wireless communication system is provided. The UE includes at least one transceiver configured to: receiving a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI reference signal (CSI-RS) transmission>CSI-RS burst and including B for 1 time instance _ST Information of Time Domain (TD) units of successive time instances. The UE further includes at least one processor operably coupled to the at least one transceiver. The at least one processor is configured to: measuring a CSI-RS burst; and determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit. The transmitter is further configured to transmit a CSI report comprising T for the DL channelAn indication of the D or DD component.

In another embodiment, a BS in a wireless communication system is provided. The BS includes at least one processor configured to: generating a configuration for CSI reporting, the configuration including information about a B including CSI-RS transmissions>CSI-RS burst and including B for 1 time instance _ST Information of TD units of successive time instances. The BS also includes at least one transceiver operably coupled to the at least one processor. The at least one transceiver is configured to: transmitting configuration; transmitting a CSI-RS burst; and receiving a CSI report including an indication of a TD or DD component of the DL channel, wherein the TD or DD component of the DL channel is based on the CSI-RS burst and the TD unit.

In yet another embodiment, a method for operating a UE is provided. The method comprises the following steps: receiving a configuration for CSI reporting, the configuration including information about a B including CSI-RS transmission>Information of CSI-RS burst of 1 time instance and including B _ST A TD unit of consecutive time instances; measuring a CSI-RS burst; determining a TD or DD component of the DL channel based on the measurement of the CSI-RS burst and the TD unit; and transmitting a CSI report including an indication of the TD or DD component of the DL channel.

Other technical features may be readily apparent to one skilled in the art from the following figures, descriptions, and claims.

Before proceeding with the detailed description that follows, it may be advantageous to set forth definitions of certain words and phrases used in this patent document. The term "couple" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with one another. The terms "transmit," "receive," and "communicate," and derivatives thereof, include direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and/or. The phrase "associated with … …" and its derivatives refer to include, are included, are interconnected with … …, are involved, are connected to or are connected with … …, are coupled to or are coupled with … …, can communicate with … …, are cooperative with … …, are interleaved, are juxtaposed, are proximate, are combined with or are combined with … …, have the attribute … …, have the relationship with … … or with … …, or the like. The term "controller" refers to any device, system, or portion thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and/or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. 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 that only one item in the list may be required. For example, "at least one of A, B and C" includes any combination of: A. b, C, A and B, A and C, B and C, and a and B and C.

Furthermore, the various functions described below may be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted 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 capable of being accessed by a computer, such as Read Only Memory (ROM), random Access Memory (RAM), a hard disk drive, a Compact Disc (CD), a Digital Video Disc (DVD), or any other type of memory. "non-transitory" computer-readable media do not include wired, wireless, optical, or other communication links that transmit transitory electrical or other signals. Non-transitory computer readable media include media that can permanently store data and media that can store data and be later rewritten, such as rewritable optical disks or erasable storage devices.

Other definitions for certain 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 as well as future uses of such defined words and phrases.

Advantageous effects

Drawings

For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts:

fig. 1 illustrates an example wireless network according to an embodiment of the disclosure;

FIG. 2 illustrates an example gNB in accordance with an embodiment of the present disclosure

Fig. 3 illustrates an example UE in accordance with an embodiment of the present disclosure;

fig. 4A shows Gao Jietu of an orthogonal frequency division multiple access transmit path in accordance with an embodiment of the present disclosure;

fig. 4B shows Gao Jietu of an orthogonal frequency division multiple access receive path in accordance with an embodiment of the present disclosure;

fig. 5 shows a transmitter block diagram of PDSCH in a subframe according to an embodiment of the disclosure;

fig. 6 shows a receiver block diagram of PDSCH in a subframe according to an embodiment of the disclosure;

fig. 7 shows a block diagram of a transmitter of PUSCH in a subframe according to an embodiment of the disclosure;

Fig. 8 shows a receiver block diagram of PUSCH in a subframe according to an embodiment of the disclosure;

fig. 9 illustrates an example antenna block or array forming a beam in accordance with an embodiment of the present disclosure;

figure 10 illustrates channel measurements with and without doppler components according to an embodiment of the present disclosure;

fig. 11 illustrates an antenna port layout according to an embodiment of the present disclosure;

FIG. 12 illustrates a 3D grid of oversampled DFT beams in accordance with an embodiment of the present disclosure;

fig. 13 illustrates an example of a UE configured to receive bursts of NZP CSI-RS resources in accordance with an embodiment of the disclosure;

fig. 14 illustrates a configuration configured to determine B based on a value B in a CSI-RS burst, according to an embodiment of the disclosure ₄ An example of a UE of values of (a);

FIG. 15 illustrates a device configured to, when B, in accordance with an embodiment of the present disclosure _ST Determination of B when unequal B ₄ An example of a UE of values of (a);

FIG. 16 illustrates a device configured to determine when B, according to an embodiment of the present disclosure _ST Determination of B when B is not aliquoted ₄ An example of a UE of values of (a);

FIG. 17 illustrates a device configured to, when B, in accordance with an embodiment of the present disclosure _ST Determination of B when B is not aliquoted ₄ An example of a UE of values of (a);

FIG. 18 illustrates a system configured to determine B based on ST units according to an embodiment of the present disclosure ₄ An example of a UE of values of (a);

FIG. 19 illustrates a cross-J configured to be based in accordance with an embodiment of the present disclosure>Value B of 1 CSI-RS burst to determine B ₄ An example of a UE of values of (a);

FIG. 20 illustrates a method configured to determine N based on a value B of a cross-aggregated CSI-RS burst, in accordance with an embodiment of the present disclosure ₄ An example of a UE of values of (a);

FIG. 21 illustrates determining N based on ST units formed across J CSI-RS bursts, according to an embodiment of the present disclosure ₄ An example of a UE of values of (a);

FIG. 22 illustrates a J configured to utilize an occupied frequency band and a time span in accordance with an embodiment of the present disclosure>Determining N with 1 CSI-RS burst ₄ An example of a UE of values of (a);

fig. 23 shows a flowchart of a method for operating a UE in accordance with an embodiment of the present disclosure;

fig. 24 shows a flowchart of a method for operating a BS according to an embodiment of the present disclosure;

fig. 25 shows a flowchart of a method for operating a UE in accordance with an embodiment of the present disclosure; and

fig. 26 shows a flowchart of a method for operating a BS according to an embodiment of the present disclosure.

Detailed Description

According to various embodiments, a User Equipment (UE) includes: at least one transceiver configured to: receiving a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI reference signal (CSI-RS) transmission >CSI-RS burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; and at least one processor operably coupled to the at least one transceiver, the at least one processor configured to: measuring a CSI-RS burst; and determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit, wherein the at least one transceiver is configured to transmit a CSI report including an indication of the TD or DD component of the DL channel.

According to various embodiments, a Base Station (BS) includes: at least one processor configured to: generating a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI-RS transmissions>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; and at least one transceiver operably coupled to the at least one processor, the at least one transceiver configured to:

transmitting configuration; transmitting a CSI-RS burst; and receiving a CSI report including an indication of a TD or Doppler Domain (DD) component of a Downlink (DL) channel, wherein the TD or DD component of the DL channel is based on the CSI-RS burst and the TD unit.

According to various embodiments, a method performed by a User Equipment (UE), the method comprising: receiving a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI-RS transmissions>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; measuring a CSI-RS burst; determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit; and transmitting a CSI report including an indication of the TD or DD component of the DL channel.

Description of the embodiments

The present application claims priority from U.S. provisional patent application No. 63/165,956 filed on 25/3/2021. The contents of the above patent documents are incorporated herein by reference.

Figures 1 through 24, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will appreciate that the principles of the present disclosure may be implemented in any suitably arranged system or device.

The following documents and standard descriptions are incorporated by reference into the present disclosure as if fully set forth herein: 3GPP TS 36.211v17.0.0, "E-UTRA, physical channel and modulation" (referred to herein as "reference 1"); 3GPP TS 36.212v17.0.0, "E-UTRA, multiplexing and channel coding" (referred to herein as "reference 2"); 3GPP TS 36.213v17.0.0, "E-UTRA, physical layer procedure" (referred to herein as "reference 3"); 3GPP TS 36.321v17.0.0, "E-UTRA, media Access Control (MAC) protocol Specification" (referred to herein as "reference 4"); 3GPP TS 36.331v17.0.0, "E-UTRA, radio Resource Control (RRC) protocol Specification" (referred to herein as "reference 5"); 3GPP TR 22.891v14.2.0 (referred to herein as "reference 6"); 3GPP TS 38.212v17.0.0, "E-UTRA, NR, multiplexing and channel coding" (referred to herein as "reference 7"); 3GPP TS 38.214v17.0.0, "E-UTRA, NR, physical layer procedure for data" (referred to herein as "reference 8"); RP-192978, "measurements on various UE mobility environments and associated CSI-enhanced doppler spectrum", fraunhofer IIS, fraunhofer HHI, germany telecommunications (referred to herein as "reference 9"); and 3GPP TS 38.211v17.0.0, "E-UTRA, NR, physical channel and modulation" (referred to herein as "reference 10").

Aspects, features and advantages of the present disclosure will become apparent from the following detailed description simply by illustrating a number of particular embodiments and implementations, including the best mode for carrying out the disclosure. The disclosure is capable of other and different embodiments and its several details are capable of modifications in various obvious respects, all 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 as restrictive. In the drawings, the present disclosure is illustrated by way of example, and not by way of limitation.

Hereinafter, for brevity, both FDD and TDD are considered as duplex methods for both DL and UL signaling.

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 transmission waveforms or multiple access schemes, such as filtered OFDM (F-OFDM).

In order to meet the increasing demand for wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or front 5G communication systems. Thus, a 5G or front 5G communication system is also referred to as a "transcendental 4G network" or a "LTE-after-system"

A 5G communication system is considered to be implemented in a higher frequency (millimeter wave) band (e.g., 60GHz band) in order to achieve higher data rates, or in a lower frequency band (e.g., below 6 GHz) in order to achieve robust coverage and mobility support. In order to reduce propagation loss of radio waves and increase transmission coverage, beamforming, massive Multiple Input Multiple Output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, massive antenna techniques, and the like are discussed in 5G communication systems.

Further, in the 5G communication system, development of system network improvement is underway based on advanced small cells, cloud Radio Access Networks (RANs), ultra dense networks, device-to-device (D2D) communication, wireless backhaul communication, mobile networks, cooperative communication, coordinated multipoint (CoMP) transmission and reception, interference mitigation and cancellation, and the like.

The discussion of the 5G system and the frequency bands associated therewith is for reference as certain embodiments of the present disclosure may be implemented in a 5G system. However, the present disclosure is not limited to 5G systems or frequency bands associated therewith, and embodiments of the present disclosure may be used in conjunction with any frequency band. For example, aspects of the present disclosure may also be applied to 5G communication systems, 6G, or even higher versions of deployments that may use terahertz (THz) frequency bands.

Fig. 1-4B below describe various embodiments implemented in a wireless communication system using Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication techniques. The descriptions of fig. 1-3 are not meant to imply physical or architectural limitations with respect to the manner in which different embodiments may be implemented. The various embodiments of the present disclosure may be implemented in any suitably arranged communication system. The present disclosure covers components that may be used in combination or combination with each other or may operate as a stand-alone solution.

Fig. 1 illustrates an example wireless network according to an embodiment of this disclosure. The embodiment of the wireless network shown in fig. 1 is for illustration only. Other embodiments of wireless network 100 may be used without departing from the scope of this disclosure.

As shown in fig. 1, the wireless network includes a gNB 101, a gNB 102, and a gNB 103.gNB 101 communicates with gNB 102 and gNB 103. The gNB 101 is also in communication with at least one network 130, such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

The gNB 102 provides wireless broadband access to the network 130 for a first plurality of User Equipment (UEs) within the coverage area 120 of the gNB 102. The first plurality of UEs includes UE 111, which may be located in a small enterprise; 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 at a first home (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 telephone, wireless laptop, wireless PDA, or the like. The gNB 103 provides wireless broadband access to the network 130 for a second plurality of UEs within the coverage area 125 of the gNB 103. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of the gNBs 101-103 may communicate with each other and with the UEs 111-116 using 5G, LTE, LTE-A, wiMAX, wiFi or other wireless communication technology.

Depending on the network type, the term "base station" or "BS" may refer to any component (or set 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 macrocell, a femtocell, a WiFi Access Point (AP), or other wireless-enabled device. The base station may provide wireless access according to one or more wireless communication protocols, such as 5G 3GPP new radio interface/access (NR), long Term Evolution (LTE), LTE-advanced (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 the network infrastructure components that provide wireless access to a remote terminal. Further, depending on the network type, the term "user equipment" or "UE" may 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 the BS, whether the UE is a mobile device (such as a mobile phone or a smart phone) or is generally considered a stationary device (such as a desktop computer or a vending machine).

The dashed lines illustrate the general extent of coverage areas 120 and 125, which are shown as being generally circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with the gNB, such as coverage areas 120 and 125, may have other shapes including irregular shapes, depending on the configuration of the gNB and the variations in the radio environment associated with natural and man-made obstructions.

As described in more detail below, one or more of UEs 111-116 include circuitry, procedures, or a combination thereof for receiving a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI-RS transmissions>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; measuring a CSI-RS burst; determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit; and transmitting a CSI report including an indication of the TD or DD component of the DL channel. One or more of the gNBs 101-103 includes circuitry to generate configuration for Channel State Information (CSI) reportingA program, or a combination thereof, the configuration including information about a B including a CSI-RS transmission>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; transmitting configuration; transmitting a CSI-RS burst; and receiving a CSI report including an indication of a TD or Doppler Domain (DD) component of a Downlink (DL) channel, wherein the TD or DD component of the DL channel is based on the CSI-RS burst and the TD unit.

Although fig. 1 shows one example of a wireless network, various changes may be made to fig. 1. For example, the wireless network may include any number of gnbs and any number of UEs in any suitable arrangement. Further, the gNB 101 may communicate directly with any number of UEs and provide these UEs with wireless broadband access to the network 130. Similarly, each gNB 102-103 may communicate directly with the network 130 and provide the UE with direct wireless broadband access to the network 130. Furthermore, the gnbs 101, 102, and/or 103 may provide access to other or additional external networks (such as external telephone networks or other types of data networks).

Fig. 2 illustrates an example gNB 102, according to an embodiment of the disclosure. The embodiment of the gNB 102 shown in fig. 2 is for illustration only, and the gnbs 101 and 103 of fig. 1 may have the same or similar configuration. However, the gNB has a variety of configurations, and fig. 2 does not limit the scope of the present disclosure to any particular implementation of the gNB.

As shown in fig. 2, the gNB 102 includes a plurality of antennas 205a-205n, a plurality of RF transceivers 210a-210n, transmit (TX) processing circuitry 215, and Receive (RX) processing circuitry 220. The gNB 102 also includes a controller/processor 225, memory 230, and a backhaul or network interface 235.

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

TX processing circuitry 215 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from controller/processor 225. TX processing circuitry 215 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 210a-210n receive outgoing processed baseband or IF signals from TX processing circuitry 215 and up-convert the baseband or IF signals to RF signals for transmission via antennas 205a-205 n.

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, controller/processor 225 may control the reception of UL channel signals and the transmission of DL channel signals via RF transceivers 210a-210n, RX processing circuitry 220, and TX processing circuitry 215, in accordance with well-known principles. The controller/processor 225 may also support additional functions, such as higher-level wireless communication functions.

For example, the controller/processor 225 may support a beamforming or directional routing operation in which outgoing signals from the plurality of antennas 205a-205n are weighted differently to effectively direct the outgoing signals to a desired direction. The controller/processor 225 may support any of a variety of other functions in the gNB 102.

The controller/processor 225 is also capable of executing programs and other processes residing in memory 230, such as an OS. Controller/processor 225 may move data into and out of memory 230 as needed to perform the process.

The controller/processor 225 is also coupled to a backhaul or network interface 235. Backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems through a backhaul connection or through a network. The interface 235 may support communication over any suitable wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a 5G, LTE or LTE-a enabled system), 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 with a larger network (such as the internet) through a wired or wireless local area network or through a wired or wireless connection. Interface 235 includes any suitable structure that supports communication over a wired or wireless connection, such as an ethernet or RF transceiver.

Memory 230 is coupled to controller/processor 225. A portion of memory 230 may include RAM and other portions of memory 230 may include flash memory or other ROM.

Although fig. 2 shows one example of the gNB 102, various changes may be made to fig. 2. For example, the gNB 102 may include any number of each of the components shown in FIG. 2. As a particular example, an access point may include multiple interfaces 235 and the controller/processor 225 may support routing functions to route data between different network addresses. As another particular example, while shown as including a single instance of TX processing circuitry 215 and a single instance of RX processing circuitry 220, the gNB 102 may include multiple instances of each instance (such as one for each RF transceiver). Furthermore, the various components in fig. 2 may be combined, further subdivided, or omitted, and additional components may be added according to particular needs.

Fig. 3 illustrates an example UE 116 according to an embodiment of this disclosure. The embodiment of UE 116 shown in fig. 3 is for illustration only and UEs 111-115 of fig. 1 may have the same or similar configuration. However, the UE has a variety of configurations, and fig. 3 does not limit the scope of the present disclosure to any particular implementation of the UE.

As shown in fig. 3, UE 116 includes an antenna 305, a Radio Frequency (RF) transceiver 310, TX processing circuitry 315, a microphone 320, and Receive (RX) processing circuitry 325.UE 116 also includes speaker 330, processor 340, input/output (I/O) Interface (IF) 345, touch screen 350, display 355, and memory 360. Memory 360 includes an Operating System (OS) 361 and one or more applications 362.

RF transceiver 310 receives incoming RF signals from antenna 305 that are transmitted by the gNB of network 100. The RF transceiver 310 down-converts an incoming RF signal to generate an Intermediate Frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuit 325, and RX processing circuit 325 generates a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. RX processing circuit 325 sends the processed baseband signal to speaker 330 (such as for voice data) or to processor 340 for further processing (such as for web browsing data).

TX processing circuitry 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data from processor 340 (such as network data, email, or interactive video game data). TX processing circuitry 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 310 receives an outgoing processed baseband or IF signal from TX processing circuitry 315 and up-converts the baseband or IF signal to an RF signal that is transmitted via antenna 305.

Processor 340 may include one or more processors or other processing devices and execute OS 361 stored in memory 360 to control the overall operation of UE 116. For example, processor 340 may control reception of DL channel signals and transmission of UL channel signals through RF transceiver 310, RX processing circuit 325, and TX processing circuit 315, in accordance with well-known principles. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.

Processor 340 is also capable of executing other processes and programs resident in memory 360, such as processes for receiving a configuration for Channel State Information (CSI) reporting, including information regarding B including CSI-RS transmissions>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; measuring a CSI-RS burst; determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit; and transmitting a CSI report including an indication of the TD or DD component of the DL channel. Processor 340 may move data into and out of memory 360 as needed to perform the process. In some embodiments, the processor 340 is configured to execute the application 362 based on the OS 361 or in response to a signal received from the gNB or operator. Processor 340 is also coupled to I/O interface 345, I/O interface 345 providing UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers. I/O interface 345 is where these accessories and places A communication path between processors 340.

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

Memory 360 is coupled to processor 340. A portion of memory 360 may include Random Access Memory (RAM) while other portions of memory 360 may include flash memory or other Read Only Memory (ROM).

Although fig. 3 shows one example of UE 116, various changes may be made to fig. 3. For example, the various components in FIG. 3 may be combined, further subdivided, or omitted, and additional components may be added according to particular needs. As a particular 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). Further, while fig. 3 shows the UE 116 configured as a mobile phone or smartphone, the UE may be configured to operate as other types of mobile or stationary devices.

Fig. 4A is Gao Jietu of the transmit path circuit. For example, the transmit path circuitry may be used for Orthogonal Frequency Division Multiple Access (OFDMA) communications. Fig. 4B is Gao Jietu of the receive path circuit. For example, the receive path circuitry may be used for Orthogonal Frequency Division Multiple Access (OFDMA) communications. In fig. 4A and 4B, for downlink communications, the transmit path circuitry may be implemented in the base station (gNB) 102 or the relay station, and the receive path circuitry may be implemented in a user equipment (e.g., user equipment 116 of fig. 1). In other examples, for uplink communications, the receive path circuitry 450 may be implemented in a base station (e.g., the gNB 102 of fig. 1) or a relay station, and the transmit path circuitry may be implemented in a user equipment (e.g., the user equipment 116 of fig. 1).

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 (Inverse Fast Fourier Transform, IFFT) block 415 of size N, a parallel-to-serial (P-to-S) block 420, an add cyclic prefix block 425, and an up-converter (UC) 430. The receive path circuitry 450 includes a Down Converter (DC) 455, a remove cyclic prefix block 460, a serial-to-parallel (S-to-P) block 465, a Fast Fourier Transform (FFT) block 470 of size N, a parallel-to-serial (P-to-S) block 475, and a channel decode and demodulate block 480.

At least some of the components in fig. 4a400 and 4b 450 may be implemented in software, while other components may be implemented in configurable hardware or a mixture of software and configurable hardware. In particular, it is noted that the FFT blocks and IFFT blocks described in this disclosure document may be implemented as configurable software algorithms, wherein the value of size N may be modified according to the implementation.

Furthermore, while the present disclosure is directed to embodiments implementing a fast fourier transform and an inverse fast fourier transform, this is merely exemplary and should not be construed 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 may be readily replaced by a discrete fourier transform (discrete Fourier transform, DFT) function and an inverse discrete fourier transform (inverse discrete Fourier transform, IDFT) function, respectively. It is understood that for DFT and IDFT functions, the value of the N variable may be any integer (i.e., 1, 4, 3, 4, etc.), while for FFT and IFFT functions, the value of the N variable may be any integer that is a power of 2 (i.e., 1, 2, 4, 8, 16, etc.).

In transmit path circuitry 400, a channel coding and modulation block 405 receives a set of information bits, applies a coding (e.g., LDPC coding) and modulates (e.g., quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) the input bits to produce a sequence of frequency domain modulation symbols. Serial-to-parallel block 410 converts (i.e., demultiplexes) the serial modulated symbols into parallel data to produce N parallel symbol streams, where N is the IFFT/FFT size used in BS102 and UE 116. An IFFT block 415 of size N then performs an I 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 IFFT block 415 of size N to produce a serial time-domain signal. A cyclic prefix block 425 is then added to insert the cyclic prefix into the time domain signal. Finally, up-converter 430 modulates (i.e., up-converts) the output of the add cyclic prefix block 425 to an RF frequency for transmission via a wireless channel. The signal may also be filtered at baseband before conversion to RF frequency.

The transmitted RF signals arrive at the UE 116 after passing through the wireless channel and perform the inverse operation of the operation at the gNB 102. The down converter 455 down converts the received signal to baseband frequency and removes the cyclic prefix block 460 and removes the cyclic prefix to produce a serial time domain baseband signal. Serial-to-parallel block 465 converts the time-domain baseband signal to a parallel time-domain signal. The FFT block 470 of size N then performs an FFT algorithm to produce N parallel frequency domain signals. Parallel-to-serial block 475 converts the parallel frequency-domain signal into a sequence of modulated data symbols. Channel decode and demodulate block 480 demodulates and then decodes the modulated symbols to recover the original input data stream.

Each of the gnbs 101-103 may implement a transmit path similar to transmitting to the user devices 111-116 in the downlink and may implement a receive path similar to receiving from the user devices 111-116 in the uplink. Similarly, each of user devices 111-116 may implement a transmit path corresponding to an architecture for transmitting in the uplink to gNBs 101-103 and may implement a receive path corresponding to an architecture for receiving in the downlink from gNBs 101-103.

Use cases of 5G communication systems have been identified and described. These use cases can be roughly divided into three different groups. In one example, an enhanced mobile broadband (eMBB) is determined to have high bit/second requirements, less stringent latency and reliability requirements. In another example, ultra-reliable and low latency (URLL) is determined to have less stringent bit/second requirements. In yet another example, large-scale machine type communication (mctc) is determined as a number of devices up to 100,000 to 100 tens of thousands per square kilometer, but reliability/throughput/delay requirements may be less stringent. This situation may also relate to power efficiency requirements, as battery consumption may be minimized as much as possible.

The communication system includes a Downlink (DL) transmitting signals from a transmission point such as a Base Station (BS) or a NodeB to a User Equipment (UE) and an Uplink (UL) transmitting signals from the UE to a reception point such as the NodeB. The UE, also commonly referred to as a terminal or mobile station, may be fixed or mobile and may be a cellular telephone, a personal computer device or an automated device. An eNodeB, which is typically a fixed station, may also be referred to as an access point or other equivalent terminology. For LTE systems, the NodeB is commonly referred to as an eNodeB.

In a communication system such as an LTE system, DL signals may include data signals transmitting information content, control signals transmitting DL Control Information (DCI), and Reference Signals (RSs), also referred to as pilot signals. The eNodeB transmits data information through a Physical DL Shared Channel (PDSCH). The eNodeB transmits DCI over a Physical DL Control Channel (PDCCH) or Enhanced PDCCH (EPDCCH).

In response to a data Transport Block (TB) transmission from the UE, the eNodeB transmits acknowledgement information in a physical hybrid ARQ indicator channel (PHICH). The eNodeB transmits one or more of a plurality of types of RSs, including UE-Common RSs (CRSs), channel state information RSs (CSI-RSs), or demodulation RSs (DMRSs). CRS is transmitted over DL system Bandwidth (BW) and may be used by UEs to obtain channel estimates to demodulate data or control information or perform measurements. To reduce CRS overhead, the eNodeB may transmit CSI-RS in the time and/or frequency domain with less density than CRS. The DMRS may be transmitted only in BW of the corresponding PDSCH or EPDCCH, and the UE may use the DMRS to demodulate data or control information in the PDSCH or EPDCCH, respectively. The transmission time interval of the DL channel is called a subframe and may have a duration of, for example, 1 millisecond.

The DL signal also includes the transmission of logical channels carrying system control information. The BCCH is mapped to a transport channel called a Broadcast Channel (BCH) when DL signaling a Master Information Block (MIB) or to a DL shared channel (DL-SCH) when DL signaling a System Information Block (SIB). Most of the system information is included in different SIBs transmitted using the DL-SCH. The presence of system information on the DL-SCH in a subframe may be indicated by the transmission of a corresponding PDCCH transmitting a codeword with a Cyclic Redundancy Check (CRC) scrambled with a system information RNTI (SI-RNTI). Alternatively, the scheduling information for SIB transmission may be provided in an earlier SIB, and the scheduling information for the first SIB (SIB-1) may be provided by the MIB.

DL resource allocation is performed in units of subframes and Physical Resource Block (PRB) groups. The transmission BW includes frequency resource units called Resource Blocks (RBs).

Each RB includesIndividual subcarriers or Resource Elements (REs), such as 12 REs. One RB unit on one subframe is called a PRB. For PDSCH transmission BW, the UE may be assigned M _PDSCH RB, total->And RE.

The UL signal may include a data signal transmitting data information, a control signal transmitting UL Control Information (UCI), and UL RS. UL RS includes DMRS and Sounding RS (SRS). The UE transmits the DMRS only in BW of the corresponding PUSCH or PUCCH. The eNodeB may use the DMRS to demodulate the data signal or UCI signal. The UE transmits SRS to provide UL CSI to the eNodeB. The UE transmits data information or UCI through a corresponding Physical UL Shared Channel (PUSCH) or Physical UL Control Channel (PUCCH). If the UE needs to transmit data information and UCI in the same UL subframe, the UE may multiplex both in PUSCH. UCI includes: hybrid automatic repeat request acknowledgement (HARQ-ACK) information indicating correct (ACK) or incorrect (NACK) detection or absence of PDCCH Detection (DTX) for a data TB in a PDSCH; a Scheduling Request (SR) indicating whether the UE has data in a buffer of the UE; rank Indicator (RI); and Channel State Information (CSI) that enables the eNodeB to perform link adaptation for PDSCH transmission to the UE. HARQ-ACK information is also transmitted by the UE in response to detection of PDCCH/EPDCCH indicating release of the semi-permanently scheduled PDSCH.

The UL subframe includes two slots. Each time slot includes a data signal for transmitting data information, UCI, DMRS, or SRSAnd a symbol. The frequency resource element of the UL system BW is an RB. For transmission BW, N is allocated for UE _RB RB, total->RE. For PUCCH, N _RB =1. The last subframe symbol may be used to multiplex SRS transmissions from one or more UEs. The number of subframe symbols available for data/UCI/DMRS transmission is +.>Wherein if the last subframe symbol is used for transmission of SRS, N _SRS =1, otherwise N _SRS ＝0。

Fig. 5 shows a transmitter block diagram 500 for PDSCH in a subframe according to an embodiment of the disclosure. The embodiment of the transmitter block diagram 500 shown in fig. 5 is for illustration only. One or more of the components shown in fig. 5 may be implemented in dedicated circuitry configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Fig. 5 does not limit the scope of the present disclosure to any particular implementation of transmitter block diagram 500.

As shown in fig. 5, information bits 510 are encoded by an encoder 520, such as a 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 the allocated PDSCH transmission BW to REs selected by a transmission BW selection unit 555, unit 560 applies an Inverse Fast Fourier Transform (IFFT), then serializes the output by a parallel-to-serial (P/S) converter 570 to create a time domain signal, filtered by a filter 580, and the signal is sent 590. Additional functions such as data scrambling, cyclic prefix insertion, time windowing, interleaving, and others are well known in the art and are not shown for the sake of brevity.

Fig. 6 shows a receiver block diagram 600 for PDSCH in a subframe according to an embodiment of the disclosure. The embodiment of diagram 600 shown in fig. 6 is for illustration only. One or more of the components shown in fig. 6 may be implemented in dedicated circuitry configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Fig. 6 does not limit the scope of the present disclosure to any particular implementation of diagram 600.

As shown in fig. 6, the received signal 610 is filtered by a filter 620, REs 630 are selected for allocated received BW by a BW selector 635, a Fast Fourier Transform (FFT) is applied by unit 640, and the output is serialized by a parallel-to-serial converter 650. Subsequently, demodulator 660 coherently demodulates the data symbols by applying channel estimates obtained from the DMRS or CRS (not shown), and decoder 670, such as a turbo decoder, decodes the demodulated data to provide estimates of information data bits 680. For simplicity, additional functions such as time window, cyclic prefix removal, descrambling, channel estimation and deinterleaving are not shown.

Fig. 7 shows a transmitter block diagram 700 for PUSCH in a subframe, according to an embodiment of the disclosure. The embodiment of block diagram 700 shown in fig. 7 is for illustration only. One or more of the components shown in fig. 7 may be implemented in dedicated circuitry configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Fig. 7 does not limit the scope of the present disclosure to any particular implementation of block diagram 700.

As shown in fig. 7, information data bits 710 are encoded by an encoder 720, such as a turbo encoder, and modulated by a modulator 730. A Discrete Fourier Transform (DFT) unit 740 applies DFT to the modulated data bits, REs 750 corresponding to allocated PUSCH transmission BW are selected by a transmission BW selection unit 755, a unit 760 applies IFFT, and after cyclic prefix insertion (not shown), filtering is applied by a filter 770, and a signal is transmitted 780.

Fig. 8 shows a receiver block diagram 800 for PUSCH in a subframe according to an embodiment of the disclosure. The embodiment of block diagram 800 shown in fig. 8 is for illustration only. One or more of the components shown in fig. 8 may be implemented in dedicated circuitry configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Fig. 8 does not limit the scope of the present disclosure to any particular implementation of block diagram 800.

As shown in fig. 8, the received signal 810 is filtered by a filter 820. Subsequently, after removing the cyclic prefix (not shown), element 830 applies an FFT, REs 840 corresponding to the specified PUSCH reception BW are selected by reception BW selector 845, element 850 applies an Inverse DFT (IDFT), demodulator 860 coherently demodulates the data symbols by applying channel estimates obtained from the DMRS (not shown), and decoder 870, such as a turbo decoder, decodes the demodulated data to provide estimates of information data bits 880.

In the next generation cellular system, various use cases are envisaged beyond the capabilities of the LTE system. Known as 5G or fifth generation cellular systems, systems capable of operating below 6GHz and above 6GHz (e.g., in millimeter wave state) are one of the requirements. In 3GPP TR 22.891, 74 5G use cases have been identified and described; these use cases can be roughly divided into three different groups. The first group, called "enhanced mobile broadband (eMBB)", is located for high data rate services with less stringent latency and reliability requirements. The second group, called "Ultra Reliable and Low Latency (URLL)", is located in applications with less stringent data rate requirements but less tolerance to latency. The third group, called "large-scale MTC (mctc)", is located on a large number of low-power device connections, such as 100 tens of thousands per square kilometer, with less stringent requirements on reliability, data rate and delay.

The 3GPP NR specifications support up to 32 CSI-RS antenna ports, which enable the gNB to be equipped with a large number of antenna elements (e.g. 64 or 128). In this case, multiple antenna elements are mapped onto one CSI-RS port. For next generation cellular systems such as 5G, the maximum number of CSI-RS ports may remain unchanged or may increase.

Fig. 9 illustrates an example antenna block or array 900 according to an embodiment of this disclosure. The embodiment of the antenna block or array 1100 shown in fig. 9 is for illustration only. Fig. 9 does not limit the scope of the present disclosure to any particular implementation of an antenna block or array 900.

For the millimeter wave band, although the number of antenna elements may be greater for a given form factor, the number of CSI-RS ports (which may correspond to the number of digital pre-coding ports) tends to be limited due to hardware constraints, such as the feasibility of installing a large number of ADCs/DACs at millimeter wave frequencies, as shown in fig. 9. In this case, one CSI-RS port is mapped onto a large number of antenna elements controllable by a set of analog phase shifters 901. One CSI-RS port may then correspond to one sub-array that produces a narrow analog beam by analog beamforming 905. By varying the set of phase shifters across symbols or subframes, the analog beam may be configured to sweep through a wider angle (920). The number of subarrays (equal to the number of RF chains) and the number of CSI-RS ports N _CSI-PORT The same applies. Digital beamforming unit 910 spans N _CSI-PORT The analog beams perform linear combining to further increase the precoding gain. Although the analog beams are wideband (and thus not frequency selective), the digital precoding may vary across frequency subbands or resource blocks.

To achieve digital precoding, efficient design of CSI-RS is a critical factor. To this end, three types of CSI reporting mechanisms corresponding to three types of CSI-RS measurement behaviors are supported, e.g., a "class a" CSI report corresponding to a non-precoded CSI-RS, a "class B" report with k=1 CSI-RS resources corresponding to a UE-specific beamformed CSI-RS, and a "class B" report with K >1CSI-RS resources corresponding to a cell-specific beamformed CSI-RS.

For non-precoded (NP) CSI-RS, a cell-specific one-to-one mapping between CSI-RS ports and TXRUs is utilized. Different CSI-RS ports have the same wide beamwidth and direction and therefore typically have cell wide coverage. For beamformed CSI-RS, cell-specific or UE-specific beamforming operations are applied on non-zero power (NZP) CSI-RS resources (e.g., comprising multiple ports). At least at a given time/frequency, the CSI-RS ports have a narrow beamwidth, and therefore no cell-wide coverage, and at least from the perspective of the gNB. At least some CSI-RS port-resource combinations have different beam directions.

In a scenario where DL long-term channel statistics can be measured by UL signals at the serving eNodeB, UE-specific BF CSI-RS can be easily used. This is generally possible when the UL-DL duplex distance is sufficiently small. However, when this condition is not met, some UE feedback is necessary for the eNodeB to obtain an estimate of DL long-term channel statistics (or any representation thereof). To facilitate such a process, a first BF CSI-RS is transmitted with a periodicity T1 (ms) and a second NP CSI-RS is transmitted with a periodicity T2 (ms), where T1 is less than or equal to T2. This method is called hybrid CSI-RS. The implementation of hybrid CSI-RS depends largely on the definition of CSI processes and NZP CSI-RS resources.

In the 3GPP LTE specifications, MIMO has been identified as a fundamental feature to achieve high system throughput requirements, and will continue to do so in the NR as well. One of the key components of a MIMO transmission scheme is accurate CSI acquisition at the eNB (or TRP). In particular, for MU-MIMO, the availability of accurate CSI is necessary in order to guarantee high MU performance. For a TDD system, CSI may be acquired using SRS transmission that relies on channel reciprocity. On the other hand, for FDD systems, CSI may be acquired using CSI-RS transmissions from the eNB and CSI acquisition and feedback from the UE. In a conventional FDD system, the CSI feedback framework is "implicit" in the form of CQI/PMI/RI derived from a codebook of SU transmissions that are assumed to be from the eNB. Such implicit CSI feedback is inadequate for MU transmissions due to SU assumptions inherent in deriving CSI. Since future (e.g., NR) systems may be more MU-centric, such SU-MUCSI mismatch will become a bottleneck to achieve high MU performance gain. Another problem with implicit feedback is the scalability of a large number of antenna ports at the eNB. For a large number of antenna ports, the codebook design for implicit feedback is quite complex, and the designed codebook cannot guarantee to bring reasonable performance gains in the actual deployment scenario (e.g., at most only a small percentage gain can be exhibited).

In 5G or NR systems, the CSI reporting paradigm from LTE described above is also supported and is referred to as type I CSI reporting. In addition to type I, high resolution CSI reporting, referred to as type II CSI reporting, is also supported to provide more accurate CSI information for the gNB for use cases such as high order MU-MIMO. The overhead of type IICSI reporting may be a problem in practical UE implementations. One method of reducing type IICSI overhead is based on Frequency Domain (FD) compression. At rel.16nr, DFT-based FD compression of type IICSI has been supported (referred to as rel.16 enhanced type II codebook in reference 8). Some key parts of the feature include (a) Spatial Domain (SD) basis W ₁ (b) FD group W _f And (c) linearly combining the coefficients of SD and FD groupsIn a non-reciprocal FDD system, the UE needs to report full CSI (including all components). However, when there is indeed reciprocity or partial reciprocity between UL and DL, then some of the CSI components may be obtained based on the UL channel estimated using SRS transmissions from the UE. At rel.16nr, DFT-based FD compression is extended to this partial reciprocity case (referred to as rel.16 enhanced type II port selection codebook in reference 8), where W ₁ The DFT-based SD base in (a) is replaced by SD CSI-RS port selection, i.e., a +. >L of the CSI-RS ports are selected (the selection is common to both antenna polarizations or both halves of the CSI-RS ports). In this case, the CSI-RS ports are beamformed in the SD (assuming UL-DL channel reciprocity in the angle domain), and beamforming information may be obtained at the gNB based on the UL channel estimated using SRS measurements.

It is known in the literature that UL-DL channel reciprocity exists in both the angle domain and the delay domain if the UL-DL duplex distance is small. Due to the delayed transformation in the time domain (or close correlation) of the basis vectors in the Frequency Domain (FD), rel.16 enhanced type II port selection can be further extended to both the angle and delay domains (or SD and FD). Specifically, W ₁ SD base and/or W based on DFT in _f The DFT-based FD base of (a) may be replaced with SD and FD port selections, i.e., L CSI-RS ports are selected in SD and/or M ports are selected in FD. In this case, the CSI-RS ports are beamformed in SD (assuming UL-DL channel reciprocity in the angle domain) and/or FD (assuming UL-DL channel reciprocity in the delay/frequency domain), and the corresponding SD and/or FD beamforming information may be obtained at gNB based on the UL channel estimated using SRS measurements. At rel.17nr, such a codebook would be supported.

Fig. 10 illustrates channel measurements 1000 with and without doppler components in accordance with an embodiment of the present disclosure. The embodiment of the channel measurement 1000 with and without the doppler component shown in fig. 10 is for illustration only. Fig. 10 does not limit the scope of the present disclosure to any particular implementation of channel measurement 1000 with and without doppler components.

Now, when the UE speed is in medium or high speed state, the performance of the rel.15/16/17 codebook starts to deteriorate rapidly due to fast channel variations, which in turn are due to UE mobility contributing to the doppler component of the channel, and the One-time nature (One shot nature) of CSI-RS measurements and CSI reports in rel.15/16/17. This limits the usefulness of the rel.15/16/17 codebook only for low mobility or static UEs. For medium or high mobility scenarios, enhanced CSI-RS measurements and CSI reporting are required, which are based on the doppler component of the channel. As described in [ reference 9], the doppler component of the channel remains almost unchanged for a long duration, called the channel settling time, which is significantly greater than the channel coherence time. Note that current (rel.15/16/17) CSI reports are based on channel coherence time, which is not appropriate when the channel has significant doppler components. The Doppler component of the channel may be calculated based on a measurement Reference Signal (RS) burst, where the RS may be a CSI-RS or SRS. When the RS is a CSI-RS, the UE measures the CSI-RS burst and uses it to obtain the doppler component of the DL channel, and when the RS is an SRS, the gNB measures the SRS burst and uses it to obtain the doppler component of the UL channel. The obtained doppler component may be reported by the UE using a codebook (as part of CS reporting). Alternatively, the gNB may use the obtained doppler component of the UL channel to beamform CSI-RS for CSI reporting of the UE. Fig. 10 shows a graphical representation of channel measurements with and without doppler components. When measuring channels with doppler components (e.g., based on RS bursts), the measured channels may remain close to the actual changing channels. On the other hand, when there is no doppler component measurement channel (e.g., based on one-time RS), the measured channel may be far from the actually changing channel.

As described above, in order to obtain the doppler component of the channel, RS bursts need to be measured. The present disclosure provides some example embodiments of mechanisms related to measuring RS (e.g., CSI-RS or SRS) bursts.

All of the following components and embodiments are applicable to UL transmissions with CP-OFDM (cyclic prefix OFDM) waveforms, DFT-SOFDM (DFT-spread OFDM) and SC-FDMA (single carrier FDMA) waveforms. Furthermore, when the scheduling unit in time is one subframe (which may consist of one or more slots) or one slot, all the following components and embodiments are applicable to UL transmissions.

In the present disclosure, the frequency resolution (reporting granularity) and span (reporting bandwidth) of CSI reporting may be defined in terms of frequency "subbands" and "CSI reporting bands" (CRBs), respectively.

The subband for CSI reporting is defined as a set of contiguous PRBs representing the smallest frequency unit for CSI reporting. The number of PRBs in a subband may be fixed for a given DL system bandwidth value, or semi-statically configured via higher layer/RRC signaling, or dynamically configured via L1 DL control signaling or MAC control elements (MAC CEs). The number of PRBs in a subband may be included in a CSI reporting setting.

A "CSI reporting band" is defined as a contiguous or non-contiguous set/set of subbands in which CSI reporting is performed. For example, the CSI reporting band may include all subbands within the DL system bandwidth. This may also be referred to as "full band". Alternatively, the CSI reporting band may include only a set of subbands within the DL system bandwidth. This may also be referred to as a "partial band".

The term "CSI reporting band" is used only as an example of the representation function. Other terms such as "CSI reporting subband set" or "CSI reporting bandwidth" may also be used.

As far as UE configuration is concerned, the UE may be configured with at least one CSI reporting band. Such configuration may be semi-static (via higher layer signaling or RRC) or dynamic (via MAC CE or L1 DL control signaling). When configured with multiple (N) CSI reporting bands (e.g., via RRC signaling), the UE may report CSI associated with n+.n CSI reporting bands. For example, >6GHz, a large system bandwidth may require multiple CSI reporting bands. The value of n may be configured semi-statically (via higher layer signaling or RRC) or dynamically (via MAC CE or L1 DL control signaling). Alternatively, the UE may report the recommended value of n via the UL channel.

Thus, the CSI parameter frequency granularity of each CSI reporting band may be defined as follows. When one CSI parameter is used for all M in the CSI reporting band _n With subbands, the CSI parameters are configured to have M _n "Single" reporting of the CSI reporting bands for the subbands. When reporting M in band for CSI _n When each of the subbands reports one CSI parameter, the CSI parameter is configured to have M _n The CSI of a subband reports the "subband" of the band.

Fig. 11 illustrates an example antenna port layout 1100 according to an embodiment of this disclosure. The embodiment of the antenna port layout 1100 shown in fig. 11 is for illustration only. Fig. 11 does not limit the scope of the present disclosure to any particular implementation of the antenna port layout 1100.

As shown in fig. 11, N ₁ And N ₂ Respectively the number of antenna ports having the same polarization in the first and second dimensions. For 2D antenna port layout, N ₁ >1，N ₂ >1, and for a 1D antenna port layout, N ₁ >1 and N ₂ =1. Thus, for a dual polarized antenna port layout, the total number of antenna ports is 2N ₁ N ₂ 。

As described in united states patent No. 10,659,118 entitled "method and apparatus for explicit CSI reporting in advanced wireless communication system," entitled "5/19/2020, the entire contents of which are incorporated herein by reference, a UE is configured with high resolution (e.g., type II) CSI reporting, wherein a type IICSI reporting framework based on linear combining is extended to include frequency dimensions in addition to first and second antenna port dimensions.

Fig. 12 shows a 3D grid 1300 (first port dimension, second port dimension, frequency dimension) of oversampled DFT beams in which

● The first dimension is associated with a first port dimension,

● The second dimension is associated with a second port dimension, and

● The third dimension is related to the frequency dimension.

The basic sets for the first and second port field representations are length N, respectively ₁ And length N ₂ And respectively have an oversampling factor O ₁ And O ₂ . Also, the basic set for the frequency domain representation (i.e., the third dimension) is the length N ₃ And has an oversampling factor of O ₃ . In one example, O ₁ ＝O ₂ ＝O ₃ =4. In another example, the oversampling factor O _i Belonging to {2,4,8}. In yet another example, O ₁ 、O ₂ And O ₃ Is higher-layer configured (via RRC signaling).

As explained in section 5.2.2.2.6 of reference 8, the UE is configured with a higher layer parameter codebook type set to 'typeII-PortSelection-r16 (type II-port selection-r 16)' for enhanced type IICSI reporting, where for all SBs and for a given layer l=1, the precoder of v (where v is the associated RI value) is given by one of the following formulas

Or alternatively

Wherein the method comprises the steps of

·N ₁ Is the number of antenna ports (with the same antenna polarization) of the first antenna port dimension,

·N ₂ is the number of antenna ports of the second antenna port dimension (with the same antenna polarization),

·P _CSI-RS is the number of CSI-RS ports configured to the UE,

·N ₃ is the number of SBs or FD units or the number of FD components (including CSI reporting bands) for PMI reporting or the total number of precoding matrices indicated by PMI (one for each FD unit/component),

·a _i is 2N ₁ N ₂ X 1 (equation 1) or N ₁ N ₂ X 1 (equation 2) column vector, and if the antenna ports at gNB are co-polarized, a _i Is N ₁ N ₂ X 1 orPort selects a column vector and if the antenna port at gNB is dual polarized or cross polarized, a _i Is 2N ₁ N ₂ X 1 or P _CSIRS X 1 port selection column vector, where port selection vector is defined as a vector containing a value of 1 in one element and a value of 0 elsewhere, and P _CSIRS Is the number of CSI-RS ports configured for CSI reporting,

·b _f is N ₃ The x 1 column of vectors is used,

·c _l,i,f is the sum of the vectors a _i And b _f The associated complex coefficients.

In one variation, when the UE reports a subset K < 2LM coefficients (where K is fixed, configured by the gNB, or reported by the UE), then the coefficient c in equation l or 2 of the precoder equation _l,i,f Is replaced by x _l,i,f ×c _l,i,f Wherein

According to some embodiments of the present disclosure, if coefficient c _l,i,f Reported by UE, then x _l,i,f ＝1。

Otherwise (i.e. c _l,i,f Not reported by UE), x _l,i,f ＝0。

x _l,i,f An indication of either =1 or 0 is according to some embodiments of the present disclosure. For example, it may be via a bitmap.

In a variant, equation 1 or equation 2 of the precoder equation, respectively, is summarized as

And

wherein, for a given i, the number of basis vectors is M _i And the corresponding basis vector is { b } _i，f }. Note that M _i Is the coefficient c reported by the UE for a given i _l,i,f Wherein M is _i M (wherein { M) _i Either } or sigma M _i Fixed, configured by the gNB, or reported by the UE).

W ^l Is regularized to a norm 1. For rank R or R layer (v=r), the precoding matrix is formed ofGiven. Equation 2 is assumed in the remainder of this disclosure. However, embodiments of the present disclosure are general and also apply to equations 1, 3 and 4.

Here, theM is less than or equal to N ₃ . If->A is the identity matrix and is therefore not reported. Also, if m=n ₃ Then B is the identity matrix and is therefore not reported. In one example, assume M < N ₃ To report column B, the DFT codebook is oversampledIs used. For example, b _f ＝w _f Wherein the amount w _f Is given by

When O is ₃ When=1, the FD basis vector for layer l e {1,., v } (where v is RI or rank value) is given by

Wherein,and +.>Wherein->

In another example, a Discrete Cosine Transform (DCT) basis is used to construct/report a basis B for the third dimension. The mth column of the DCT compression matrix is simply given by

K=n ₃ And m=0,.. ₃ -1。

Since the DCT is applied to real-valued coefficients, the DCT is applied to real and imaginary parts (of the channel or channel feature vector), respectively. Alternatively, the DCT is applied to the amplitude and phase components (of the channel or channel eigenvector), respectively. The use of DFT or DCT basis is for illustration purposes only. The present disclosure is applicable to constructing/reporting any other basis vector of a and B.

At a higher layer, precoder W ^l May be described as follows.

Wherein a=w ₁ And type IICSI codebook [ reference 8 ]]Is Rel.15W in (F) ₁ Corresponds to, and b=w _f 。

The matrix consists of all the required linear combination coefficients (e.g. amplitude and phase or real or imaginary numbers).Coefficients (c) _l，i，f ＝p _l，i，f φ _l，i，f ) Quantized into amplitude coefficients (p _l,i，f ) And phase coefficient (phi) _l，i，f ). In one example, the amplitude coefficient (p _l,i,f ) Reporting using an a-bit amplitude codebook, where a belongs to {2,3,4}. If multiple values of A are supported, one value is configured via higher layer signaling. In another example, the amplitude coefficient (p _l,i,f ) Reported as +.>Wherein the method comprises the steps of

·Is a reference or first amplitude reported using an A1 bit amplitude codebook, where A1 belongs to {2,3,4}, and

·is the differential or second amplitude reported using an A2 bit amplitude codebook, where A2. Ltoreq.A1 belongs to {2,3,4}.

For layer L, let us relate to the Spatial Domain (SD) basis vector (or beam) i ε {0,1,.., 2L-1} and the Frequency Domain (FD) basis vector (or beam)f e {0, 1..the Linear Combination (LC) coefficient associated with M-1} is denoted as c _l,i,f And the strongest coefficient is expressed asThe strongest coefficient is K reported from using a bitmap _NZ Reported in non-zero (NZ) coefficients, where +.> And β is a higher level configuration. Remaining 2LM-K not reported by UE _NZ The coefficients are assumed to be zero. The following quantization scheme is used for quantizing/reporting K _NZ And NZ coefficients.

For the followingQuantification of NZ coefficients in the UE reports the following

Index for the strongest coefficient (i ^* ，f ^* ) An X bit indicator of (2), whereinOr (b)

The strongest coefficient(thus not reporting its amplitude/phase)

Two antenna polarization specific reference amplitudes are used.

For the coefficient strongest withThe polarization is associated because of the reference amplitude +.>So it is not reported

For other polarizations, reference amplitude Quantized to 4 bits

The 4-bit amplitude alphabet is

For { c _l，i，f ，(i，f)≠(i ^* ，f ^* )}：

For each polarization, the differential amplitude of the coefficientsCalculated relative to a reference amplitude specific to the associated polarization and quantized to 3 bits

The 3-bit amplitude alphabet is

Note: amplitude p of final quantization _l,i,f From the following componentsGive out

Each phase is quantized to 8PSK (N _ph =8) or 16PSK (N _ph =16) (which is configurable).

For the coefficient with the strongestAssociated polarization r ^* E {0,1}, we have +.>And reference amplitudeR.epsilon {0,1} and r.noteq.r for other polarizations ^* We have-> And quantizing (reporting) the reference amplitude +.>

The UE may be configured to report the M FD base vector. In the example of the yi (y) i),wherein R is a higher layer configured from {1,2}, and p is from +.>And (3) configuring high layers. In one example, for rank 1-2CSI reporting, the p value is high-level configured. For rank of>2 (e.g., rank 3-4), p value (by v ₀ Representation) may be different. In one example, for ranks 1-4, (p, v ₀ ) Is according to->Configured jointly, i.e. for rank 1-2 +>And for rank 3-4->In one example, N ₃ ＝N _SB X R, where N _SB Is the number of SBs used for CQI reporting. In the remainder of this disclosure, M is replaced with M _v To show its dependence on rank value v, so p is replaced by p _v V.epsilon. {1,2} and v ₀ Is replaced by p _v ，v∈{3，4}。

For each layer of rank v CSI reporting, l e {0,1,..v-1 }, the UE may be configured according to N ₃ The basis vectors are free in one step (independently)) Report M _v FD basis vector. Alternatively, the UE may be configured to report M in two steps as follows _v FD basis vector.

In step 1, N 'is included' ₃ ＜N ₃ An intermediate set of individual basis vectors (InS) is selected/reported, where InS is common to all layers.

In step 2, for each layer l e {0, 1..v-1 } of rank v CSI report, according to N 'in InS' ₃ Basis vectors, M FD basis vectors are freely (independently) selected/reported.

In one example, when N ₃ At 19 or less, a one-step process is used, and when N ₃ >19, a two-step process was used. In one example of this, in one implementation,wherein alpha is>1 is fixed (e.g. to 2) or configurable.

The codebook parameters used in DFT-based frequency domain compression (equation 5) are (L, p for v ε {1,2 }) _v P for v.epsilon.3, 4 _v ，β，α，N _ph ). In one example, the set of values for these codebook parameters is as follows.

L: the set of values is typically {2,4}, except for rank 1-2, 32 CSI-RS antenna ports, and r=1, l e {2,4,6}.

·

·α∈{1.5，2，2.5，3}。

·N _ph ∈{8，16}。

In another example, the set of values for these codebook parameters is as follows: alpha=2, N _ph =16 and as shown in table 1, wherein L, β and p _v The value of (2) is determined by the higher-layer parameter param coding-r 17 (parameter combination-r 17). In one example, the undesirable UE is configured as paramcombinerion-r17 is equal to

P when _CSI-RS When=4, 3, 4, 5, 6, 7 or 8

When CSI-RS port number P _CSI-RS When < 32, 7 or 8

When the high-level parameter typeII-RI-Restriction-r17 (type II-RI-Restriction-r 17) is configured as r _i When=1 (for any i > 1), 7 or 8

When r=2, 7 or 8

The bit map parameter typeII-RIRestriction-r17 forms the bit sequence r ₃ ，r ₂ ，r ₁ ，r ₀ Wherein r is ₀ Is LSB, r ₃ Is the MSB. When r is _i When zero, i e {0,1,..3 }, PMI and RI reporting is not allowed to correspond to any precoder associated with layer v=i+1. The parameter R is configured with a higher layer parameter number ofpmisubbandsbacchband-R17 (number of PMI subbands per CQI subband-R17). The parameter controls the precoding matrix N indicated by PMI according to the number of subbands in the csi-reporting band, the subband size configured by the higher-level parameter subband size, and the total number of PRBs in the bandwidth part ₃ Is a sum of (3).

TABLE 1

The above framework (equation 5) represents the method for combining M at 2L SD beams _v Multiple (N) using linear combinations (double sums) on each FD beam ₃ And a number of) the precoding matrix of the FD unit. By substituting W with TD base matrix _t Substitute FD matrix W _f The framework may also be used to represent the precoding matrix in the Time Domain (TD), where W _t Comprises M representing some form of delay or channel tap position _v And TD beams. Thus, the precoder W ^l Can be described as follows.

In one example, M _v The TD beams (representing delay or channel tap positions) are based on N ₃ The set of individual TD beams is selected, i.e. N ₃ Corresponds to a maximum number of TD units, where each TD unit corresponds to a delay or channel tap position. In one example, the TD beam corresponds to a single delay or channel tap position. In another example, the TD beam corresponds to a plurality of delay or channel tap positions. In another example, the TD beam corresponds to a combination of multiple delays or channel tap positions.

The framework of CSI reporting described above based on the framework of space-frequency compression (equation 5) or space-time compression (equation 5A) may be extended to the doppler domain (e.g., for medium to high mobility UEs). The present disclosure focuses on reference signal bursts that may be used to obtain the doppler component of a channel that may be used to perform doppler domain compression.

Fig. 13 illustrates an example 1300 of a UE configured to receive bursts of non-zero power (NZP) CSI-RS resources in accordance with an embodiment of the disclosure. The embodiment 1300 of a UE configured to receive bursts of NZP CSI-RS resources shown in fig. 13 is for illustration only. Fig. 13 does not limit the scope of the present disclosure to any particular implementation of a UE 1300 configured to receive bursts of NZP CSI-RS resources.

In one embodiment, as shown in FIG. 13, the UE is configured to receive bursts of non-zero power (NZP) CSI-RS resources in B time slots, referred to as CSI-RS bursts for simplicity, where B≡1. The B time slot may correspond to at least one of the following examples.

In one example, the B time slots are evenly/uniformly spaced apart by an inter-slot spacing d.

In one example, the B-time slots may be separated by an inter-slot interval e ₁ ＝d ₁ 、e ₂ ＝d ₂ -d ₁ 、e ₃ ＝d ₃ -d ₂ .., etc. are non-uniformly spaced, wherein for at least one pair (i, j) (where i+.j), e _i ≠e _j 。

The UE receives the CSI-RS burst, estimates B instances of DL channel measurements, and uses the channel estimates to obtain the doppler component of the DL channel. The CSI-RS burst may be linked (or associated) to a single CSI report setting (e.g., via a higher layer parameter CSI-ReportConfig (CSI-report configuration)), where the corresponding CSI report includes information about the doppler component of the DL channel.

Let h _t DL channel estimation based on CSI-RS resources received in time slot t e {0,1,.,. When the DL channel estimate in slot t is of size N _Rx ×N _Tx ×N _Sc Matrix G of _t When then h _t ＝vec(G _t ) Wherein N is _Rx 、N _Tx And N _Sc The number of receive (Rx) antennas at the UE, the number of CSI-RS ports measured by the UE, and the number of subcarriers in the frequency band of the CSI-RS burst, respectively. The symbol vec (X) is used to represent a vectorization operation in which the matrix X is converted into a vector by concatenating the elements of the matrix in an order of, for example, 1→2→3→etc. (meaning that the concatenation starts from a first dimension, then moves a second dimension, and continues until the last dimension). Suppose H _B ＝[h ₀ h ₁ ... h _B-1 ]Is a concatenated DL channel. The Doppler component of the DL channel may be based on H _B Obtained. For example, H _B Can be expressed as Wherein Φ= [ Φ ] ₀ φ ₁ ... φ _N-1 ]Is a Doppler Domain (DD) basis matrix whose columns include basis vectors, c= [ C ] ₀ c ₁ ... c _N-1 ]Is a coefficient matrix whose columns include coefficient vectors, and N < B is the number of DD basis vectors. Due to H _B The columns of (a) may be related so that DD compression may be achieved when the value of N is small (compared to the value of B). In this example, the Doppler component of the channel is represented by a DD basis matrix Φ and a coefficient matrix C.

FIG. 14 illustrates a configuration for determining N based on a value B in a CSI-RS burst, according to an embodiment of the present disclosure ₄ Of (2) value of UEExample 1400. The configuration shown in fig. 14 is configured to determine N based on the value B in the CSI-RS burst ₄ The embodiment 1400 of the UE of the value of (2) is for illustration only. Fig. 14 does not limit the scope of the present disclosure to being configured to determine N based on the value B in a CSI-RS burst ₄ Any particular implementation of UE 1400 of the value of (1).

Let N be ₄ Is the basis vector { phi } _s Length of, e.g., each base vector is length N ₄ Column vector x 1.

In one embodiment I.1, the UE is configured to determine N based on the value B (the number of CSI-RS instances) in the CSI-RS burst and the component across which DD compression is performed ₄ Wherein each component corresponds to one or more time instances within a CSI-RS burst. In one example, N ₄ Is fixed (e.g. N ₄ =b) or configured (e.g., via RRC or MAC CE or DCI) or reported by the UE (as part of CSI reporting). In one example, the B CSI-RS instances may be divided into sub-time (ST) units (instances), where each ST unit is defined as (at most) N in a CSI-RS burst _ST A continuous time instance. In this example, the component for DD compression corresponds to the ST unit. Three examples of ST cells are shown in fig. 14. In a first example, each ST unit includes N in a CSI-RS burst _ST =1 time instance. In a second example, each ST element includes N in a CSI-RS burst _ST =2 consecutive time instances. In a third example, each ST element includes N in a CSI-RS burst _ST =4 consecutive time instances.

N _ST The value of (a) may be fixed (e.g., N _ST =1 or 2 or 4) is either indicated to the UE (e.g., via higher layer RRC or MAC CE or DCI-based signaling) or reported by the UE (e.g., as part of CSI reporting). N (N) _ST May be subject to UE capability reporting (fixed or indicated or reported). N (N) _ST May also depend on the value of B (e.g., one value for a range of values of B and another value for another range of values of B).

Regarding ST units, at least one of the following examples may be used/configured.

In one example I.1.1, when N _ST When aliquoting B, thenAnd each ST unit includes N _ST Successive time instances, i.e. ST ₀ Including time instance->ST ₁ Including time instancesEtc. Generally, ST _x Including time instance->FIG. 14 includes three examples, where N _ST Divide B equally, for example, when b=16.

FIG. 15 illustrates a device configured to determine when N, in accordance with an embodiment of the present disclosure _ST Determination of N when B is not equally divided ₄ Is an example 1500 of a UE of values of (a). Shown in FIG. 15 configured to when N _ST Determination of N when B is not equally divided ₄ The embodiment 1500 of the UE of the value of (2) is for illustration only. FIG. 15 does not limit the scope of the present disclosure to being configured when N _ST Determination of N when B is not equally divided ₄ Any particular implementation of UE 1500 of the value of (c).

In one example I.1.2, when N _ST When B is not aliquoted, then at least one of the following examples may be used/configured.

In one example i.1.2.1,wherein->Representing a lower rounding function (Flooring function) mapping the number y to a maximum integer z satisfying z.ltoreq.y. Z=b- (N) ₄ -1)N _ST The continuous time instance is not used, the remainder is used to obtain N ₄ A plurality of ST units, each ST unit including N _ST A continuous time instance. The unused Z consecutive time instances may be at the beginning (i.e., T ₀ ...T _Z-1 ) Or after ending (i.e., T _B-Z ...T _B-1 ) Or in both (start and end). Thus, to obtain N ₄ An example of a start time for an ST unit may be T ₀ ...T _Z-1 Any one of them. When the example of the start time is T ₀ Time instance->Is used to form the ST unit, while the remaining time instance +.>Is not used. Alternatively, when the start time instance is T _Z-1 Time then time instance T _Z-1 ，T _Z ，...，T _B-1 Is used to form ST cells, while the remaining time instance T ₀ ...T _Z-2 Is not used. The start time instance may be fixed (e.g., T ₀ ) Or configured (e.g., via RRC or MAC CE or DCI) or reported by the UE. Three examples are shown in fig. 15. In example 1, the start time is T ₀ There are 2 time instances in the end that are not used and the rest are used to obtain 4 ST elements. In example 2, the start time is T ₂ There are 2 time instances in the beginning that are not used, the remainder are used to obtain 4 ST elements. In example 3, the start time is T ₁ And 2 time instances (one in the beginning and the other in the end) are unused, the remainder being used to obtain 4 ST units. />

FIG. 16 illustrates a device configured to determine when N, in accordance with an embodiment of the present disclosure _ST Determination of N when B is not equally divided ₄ An example 1600 of a UE of a value of (a). Shown in FIG. 16 configured to be when N _ST Determination of N when B is not equally divided ₄ The embodiment 1600 of the UE of the value of (2) is for illustration only. FIG. 16 is not intended to limit the scope of the present disclosure to that configured when N _ST Determination of N when B is not equally divided ₄ Any particular implementation of UE 1600 of the value of (c).

In one example I.1.2In the step (2),wherein->Representing a Ceiling function (celing function) that maps the number y to a minimum integer z that satisfies y.ltoreq.z. N (N) ₄ One of the ST units, e.g. ST _x Including z=b- (N) ₄ -1)N _ST Individual ST continuous time instances (which are less than N _ST ) And the remaining N ₄ -1 ST element each comprising N _ST A continuous time instance. ST (ST) _x May be ST ₀ And->One of them. ST (ST) _x May be fixed (e.g., T ₀ ) Or configured (e.g., via RRC or MAC CE or DCI) or reported by the UE. When ST is _x ＝ST ₀ At the time of first ST ₀ Comprises Z < N _ST Time instance T ₀ ，T ₁ ，...，T _Z-1 Wherein z=b- (N) ₄ -1)N _ST The method comprises the steps of carrying out a first treatment on the surface of the And->Each of (a) includes N _ST Time instance, i.e. ST ₁ Including time instance->ST ₂ Including time instance->Etc. until the last->Comprises->Also, when->When, last->Comprises Z < N _ST Time instance T _B-Z ，...，T _B-1 The method comprises the steps of carrying out a first treatment on the surface of the And->Each of (a) includes N _ST Time instance, i.e. ST ₀ Including time instance->ST ₁ Including time instancesEtc. up to +.>Including time instancesFig. 16 shows two examples. In example 1, ST _x ＝ST ₄ There are 2 time instances in the end where Z < N is formed _ST ST of individual time instance ₄ The remainder is used to obtain 4 ST elements. In example 2, ST _x ＝ST ₀ There are 2 time instances in the beginning where Z < N is formed _ST ST of individual time instance ₀ The rest are used to obtain 4 ST elements.

FIG. 17 illustrates a device configured to determine when N, in accordance with an embodiment of the present disclosure _ST Determination of N when B is not equally divided ₄ An example 1700 of a UE of values of (a). Shown in FIG. 17 configured to when N _ST Determination of N when B is not equally divided ₄ The embodiment 1700 of the UE of the value of (2) is for illustration only. FIG. 17 is not intended to limit the scope of the present disclosure to being configured when N _ST Determination of N when B is not equally divided ₄ Any particular implementation of UE1700 of the value of (a).

In one example i.1.2.3, if 2+.z=B-(N ₄ -1)N _ST ＜N _ST Then N ₄ Two of the ST units, ST ₀ And->Comprising at least one but less than N _ST A continuous time instance, and->Each of (a) includes N _ST A continuous time instance. Fig. 17 shows an example. Includes ST ₀ And->The number of time instances of (a) may be based on at least one of the following.

In one example, ST ₀ IncludedTime instance (in the beginning) and +.>Comprises->Time instance (in the end).

In one example, ST ₀ IncludedTime instance (in the beginning) and +.>Comprises->Or->Time instance (in the end).

In one example, ST ₀ IncludedTime instance (in the beginning) and +.>Comprises->Or Z- & lt- & gt>Time instance (in the end). />

When z=1, at least one example of example i.1.2.1 or example i.1.2.2 may be used.

FIG. 18 illustrates a system configured to determine N based on ST units according to an embodiment of the present disclosure ₄ Is an example 1800 of a UE of a value of (a). The configuration shown in fig. 18 is configured to determine N based on ST units ₄ The embodiment 1800 of the UE of the value of (2) is for illustration only. FIG. 18 does not limit the scope of the present disclosure to being configured to determine N based on ST units ₄ Any particular implementation of UE 1800 of the value of (c).

In one embodiment I.2, the UE is configured to determine N based on the ST unit ₄ Is described (see example I.1). In particular, B CSI-RS instances in a CSI-RS burst may be divided into sub-time (ST) units (instances), where each ST unit is defined as a continuous time instance in the CSI-RS burst. At least one of the following examples may be used/configured.

In one example i.2.1, the ST element includes all time instances in the CSI-RS burst. Therefore, the value N ₄ =1. In this example, DD compression may not be performed.

In one example I.In 2.2, B time instances in the CSI-RS burst are divided into r parts, and each part corresponds to an ST element. Therefore, the value N ₄ =r. When r bisects B, then each ST unit includesA continuous time instance, i.e. ST ₀ Including time instance->ST ₁ Including time instance->Etc. When r is unequal to B, then the first subset of ST includes +.>A continuous time instance, and (the second subset of) the remaining ST comprises +.>A continuous time instance. First subset and r ₁ Corresponding to ST, the second subset corresponds to r ₂ ＝r-r ₁ The ST corresponds to. In one example, the first subset is with +.>Corresponding to, and second subset andcorresponding to each other. Each ST element in the first subset comprises +.>A continuous time instance, i.e. ST ₀ Including time instance->ST ₁ Including time instancesEtc. up to +.>Including time instancesEach ST element in the second subset comprises +.> A continuous time instance, i.e.)>Including time instance->Including time instancesEtc. until ST _r-1 Including time instancesWhere x=r ₁ N _ST,1 . Fig. 18 shows an example. In one example, r ₁ =b mod r. In one example, a->In one example, a->

The value r may be fixed (e.g., r=2) or configured (e.g., via RRC or MAC CE or DCI)) or reported by the UE (e.g., as part of CSI reporting). The value of r (fixed or indicated or reported) may be subject to UE capability reporting. The value of r may also depend on the value of B (e.g., one value for a range of values of B and another value for another range of values of B).

FIG. 19 illustrates a cross-J configured to be based in accordance with an embodiment of the present disclosure>Value B of 1 CSI-RS burst to determine N ₄ Is an example 1900 of a UE of a value of (a). The configuration shown in FIG. 19 is based on across J >Value B of 1 CSI-RS burst to determine N ₄ The embodiment 1900 of the UE of the value of (2) is for illustration only. FIG. 19 is not intended to limit the scope of the present disclosure to being configured based on across J>Value B of 1 CSI-RS burst to determine N ₄ Any particular implementation of UE 1900 of the value of (1).

In one embodiment i.3, the UE is configured to be based on across J>Value B (number of CSI-RS instances) of 1 CSI-RS burst and component across which DD compression is performed to determine N ₄ Wherein each component corresponds to one or more time instances within J CSI-RS bursts. Suppose B _j Is the number of CSI-RS instances within the jth CSI-RS burst, where j∈ {1,.,. J }, andindicating the corresponding time instance of the j-th burst. In one example of this, in one implementation,the B CSI-RS instances may be divided into sub-time (ST) units (instances), where each ST unit is defined as the (maximum) N in a CSI-RS burst or across two adjacent CSI-RS bursts _ST A continuous time instance. In this example, the component for DD compression corresponds to the ST unit.

In one example, ST size N _ST Across J CSI-RS bursts is common (i.e., one value for all CSI-RS bursts). N (N) _ST May be fixed (e.g., N _ST =1, 2 or 4) or is indicated to the UE (e.g., via higher layer RRC or MAC CE or DCI-based signaling) or reported by the UE (e.g., as part of CSI reporting). N (N) _ST May be subject to UE capability reporting (fixed or indicated or reported). N (N) _ST The value of (a) may also depend on B or B _j Of (e.g., oneOne value for the range of values of B and another value for the other range of values of B).

In another example, ST size N _ST Is separate (independent) for J CSI-RS bursts (i.e., one separate value for each CSI-RS burst). Value N for all CSI-RS bursts _ST May be fixed (e.g., 1 or 2 or 4) or indicated to the UE (e.g., via higher layer RRC or MAC CE or DCI-based signaling) or reported by the UE (e.g., as part of CSI reporting). The value (fixed or indicated or reported) may be subject to UE capability reporting. The value may also depend on B _j Of (e.g. one value for B _j Another value for B _j Another range of values of (c). Optionally, for N of CSI-RS bursts _ST The subset of values may be fixed and the remainder may be indicated to or reported by the UE, wherein the subset itself may be fixed or configured or reported by the UE.

In one example i.3.1, ST elements are formed separately for each CSI-RS burst (and not across multiple bursts), and ST elements are aggregated across multiple CSI-RS bursts to determine N ₄ (total number of ST elements across J CSI-RS bursts). Fig. 19 shows an example. For each CSI-RS burst, one of the examples in embodiment i.1 may be used.

In one example I.3.1.1, when ST is the size N _ST When the across J CSI-RS bursts are common, then for the J-th CSI-RS burst, the number of ST elements, N _4，j Is determined as follows.

When N _ST Aliquoting B _j When the details of the ST element are as described in example i.1.1.

When N _ST Unequal part B _j At least one of the following is used.

οAnd the details of the ST unit are as described in example i.1.2.1.

οAnd the details of the ST unit are as described in example i.1.2.2.

οAnd the details of the ST unit are as described in example i.1.2.3.

In this example of the present invention, in this case,note that when N _ST Equal number of all B _j In the case of value, then->

In one example I.3.1.2, when ST is the size N _ST When each of the J CSI-RS bursts is separate (independent), the ST size for the J-th burst is expressed asFor the jth CSI-RS burst, the number of ST units N _4，j Is determined as follows.

WhenAliquoting B _j When in use, then->And the details of the ST element are as described in example i.1.1.

WhenUnequal part B _j At least one of the following is used.

οAnd the details of the ST unit are as described in example i.1.2.1.

ο0 and the details of the ST unit are as described in example i.1.2.2.

οAnd the details of the ST unit are as described in example i.1.2.3.

In this example of the present invention, in this case,note that when->Aliquoting all B _j In the case of value, then->

FIG. 20 illustrates a method configured to determine N based on a value B of a cross-aggregated CSI-RS burst, in accordance with an embodiment of the present disclosure ₄ Is an example 2000 of a UE of a value of (a). The value B shown in fig. 20 configured to determine N based on the cross-aggregated CSI-RS burst ₄ The embodiment 2000 of the UE of the value of (2) is for illustration only. Fig. 20 does not limit the scope of the present disclosure to being configured to determine N based on value B of a cross-aggregated CSI-RS burst ₄ Any particular implementation of UE 2000 of the value of (a).

In one example i.3.2, ST elements may be formed across multiple CSI-RS bursts. For example, B time instances in J CSI-RS bursts may be ordered (classified) to form an aggregated CSI-RS burst, and one of the examples in embodiment I.1 may be used to determine N using the (classified) time instances in the aggregated CSI-RS burst ₄ And the corresponding ST element.

In one example, the classification (ordering) is based on CSI-RS burst index j. For example, if j ₁ ≤j ₂ Wherein j is ₁ And j ₂ Belongs to { 1..J } and is two CSI-RS burst indexes, time instance At another time instance->Previously (i.e., allocated a lower index in the aggregated CSI-RS burst). When j is ₁ ＝j ₂ (same burst index), if k ₁ ＜k ₂ Then->At->Before; otherwise->At->Before.

In one example, the classification (ordering) is based on time instances. For example, if T ₁ ≤T ₂ Time instance T ₁ At another time instance T ₂ Before. When T is ₁ ＝T ₂ The time instance with the smaller CSI-RS burst index is before. Fig. 20 shows two classification examples and corresponding aggregated CSI-RS bursts.

FIG. 21 illustrates determining N based on ST units formed across J CSI-RS bursts, according to an embodiment of the present disclosure ₄ Is an example 2100 of a UE of a value of (a). Determining N based on ST elements formed across J CSI-RS bursts shown in fig. 21 ₄ The embodiment 2100 of the UE of the value of (2) is for illustration only. FIG. 21 does not limit the present disclosureThe range is limited to determining N based on ST units formed across J CSI-RS bursts ₄ Any particular implementation of UE 2100 for the value of (a).

In one embodiment I.4, the UE is configured to determine N based on ST units formed across J CSI-RS bursts ₄ (see example I.3). In particular, the total number of B CSI-RS instances across J CSI-RS bursts may be divided into sub-time (ST) units (instances), where each ST unit is defined as a continuous time instance in a CSI-RS burst or across two adjacent CSI-RS bursts. At least one of the following examples may be used/configured.

In one example i.4.1, for each CSI-RS burst, the ST element includes all time instances in the CSI-RS burst. Therefore, the value N ₄ =j. In this example, DD compression may be performed across ST units, each ST unit including a CSI-RS burst.

In one example i.4.2, ST units are formed separately for each CSI-RS burst (and not across multiple bursts), and ST units are aggregated across multiple CSI-RS bursts to determine N ₄ (total number of ST elements across J CSI-RS bursts). For each CSI-RS burst, example i.2.2 may be used to obtain ST elements. Specifically, for each j, B in the jth CSI-RS burst _j The time instances are divided into r parts and each part corresponds to an ST element. Therefore, the value N ₄ =j×r. Assume thatThe ST elements corresponding to j CSI-RS bursts are represented.

For the j-th CSI-RS burst, when r aliquoting B _j When each ST unit includesA continuous time instance, i.e.)>Including time instance->Including time instancesEtc. When r is not equal to B _j When, then the first subset of ST comprises +.> A continuous time instance, and (the second subset of) the remaining ST comprises +.>A continuous time instance. First subset and->The second subset corresponds to +. >The ST corresponds to. In one example, the first subset is combined withCorresponds to, and the second subset is equal to +.>Corresponding to each other. Each ST element in the first subset comprises +.>A continuous time instance, i.e.)>Including time instancesIncluding time instance->Etc. up to +.>Including time instance->Each ST unit in the second subset comprises A continuous time instance, i.e.)>Including time instance->Including time instance->Etc. up to +.>Including time instancesWherein->In one example of this, in one implementation,in one example, a->In one example, a->

The value r may be fixed (e.g., r=2) or configured (e.g., via RRC or MAC CE or DCI)) or reported by the UE (e.g., as part of CSI reporting). The value of r (fixed or indicated or reported) may be subject to UE capability reporting. The value of r may also depend on B or B _j For example, one value for a range of values for B and another value for another range of values for B).

In one example i.4.3, which is an extension of example i.4.2, B in the jth CSI-RS burst _j The time instances are divided into r _j Each portion corresponding to an ST element. Therefore, the value The remaining details are the same as example I.4.2 except that r is replaced with r _j . Fig. 21 gives an example.

R for all CSI-RS bursts _j The value may be fixed (e.g., 1 or 2 or 4) or configured (e.g., via RRC or MAC CE or DCI) or reported by the UE (e.g., as part of CSI reporting). The value (fixed or indicated or reported) may be subject to UE capability reporting. The value may also depend on B _j Of (e.g. one value for B _j Another value for B _j Another range of values of (c). Optionally, r for CSI-RS bursts _j The subset of values may be fixed and the remainder may be indicated to or reported by the UE, wherein the subset itself may be fixed or configured or reported by the UE.

In one example i.4.4, ST elements may be formed across multiple CSI-RS bursts. For example, B time instances in J CSI-RS bursts may be classified (ordered) to form an aggregated CSI-RS burst, and example i.2.2 may be used to use the aggregationDetermining N for time instances (classified) in CSI-RS bursts ₄ Values and corresponding ST elements. The classification may be according to one of examples i.3.2.

FIG. 22 illustrates a method configured to determine N using J > 1 CSI-RS bursts occupying a frequency band and a time span in accordance with an embodiment of the present disclosure ₄ An example 2200 of a UE of a value of (a). The configuration shown in FIG. 22 is configured to determine N using J > 1 CSI-RS bursts occupying a frequency band and a time span ₄ The embodiment 2200 of the UE of the value of (2) is for illustration only. FIG. 22 does not limit the scope of the present disclosure to J configured to utilize occupied frequency bands and time spans>Determining N with 1 CSI-RS burst ₄ Any particular implementation of UE 2200 for values of (1).

In one embodiment II.1, the UE is configured with J.gtoreq.1 CSI-RS bursts (as previously shown in this disclosure) occupying a frequency band and a time span (duration), where the frequency band includes A RBs and the time span includes B time instances (of the CSI-RS resources). When J>1, a RBs and/or B time instances may be aggregated across J CSI-RS bursts. In one example, the frequency band is equal to the CSI reporting band and the time span is equal to the number of CSI-RS resource instances (across J CSI-RS bursts), both of which may be configured to the UE for CSI reporting, which may be based on DD compression. The UE is also configured to divide (equal) a RBs into Subbands (SB) and/or divide (equal) B time instances into sub-times (ST). The division of A RBs may be based on SB size value N _SB This value may be configured to the UE (see table 5.2.1.4-2 of reference 8). As described in this disclosure, the partitioning of the B time instances may be based on the ST size value N _ST Or r-value (see examples i.1 to i.4). Fig. 22 shows an example in which RB0, RB1, & gt, RB _A-1 Includes A RBs, T ₀ ，T ₁ ，...，T _B-1 Comprising B time instances, SB size N _SB =4 and ST size N _ST ＝2。

In one example ii.1.1, partitioning a RBs into SBs is performed when the frequency granularity of CQI and/or PMI reporting is configured (e.g., by higher layers) to be "per SB". That is, one CQI and/or one CQI per SB is reportedPrecoding matrix. For PMI reporting, each SB may be further divided into (up to) R parts, similar to PMI reporting based on rel.16 enhanced type II codebook. The value of R may be {1,2, N } _SB }. The value of R may be configured (e.g., via higher layers), which may be subject to UE capability reporting. In one example, support for r=1 is mandatory (thus, no additional signaling from the UE is needed), whereas for R>Support of 1 is optional (thus, additional signaling is required if supported by the UE). An example of two R values (r=1, 2) is shown in fig. 13, where SB is not divided (i.e., 4 RBs form SB) when r=1, and each SB is divided into two parts (i.e., 4 RBs form SB, which are divided into 2 parts, each part having 2 RBs) when r=2. When R is >1, a total of N ₃ The number of precoding matrices is reported (via PMI), one for each FD unit/component, where when each SB is divided into R parts,and in general, < >>Wherein->Is the total number of SB's, P is the number of portions of the first SB, Q is the number of portions of the last SB, and P, Q ε {1,..R }.

In one example ii.1.2, partitioning B time instances into ST is performed when the time granularity of CQI and/or PMI reporting is configured (e.g., by higher layers) as "per ST". That is, one CQI and/or precoding matrix is reported for each ST. For PMI reporting, each ST can be further divided into (at most) R _ST And part, similar to the rel.16 enhanced type II codebook based PMI reporting. R is R _ST The value of (2) may be {1,2, N } _ST }。R _ST May be configured (e.g., via higher layers), which may be subject to UE capability reporting. In one example, for R _ST Support of =1 is mandatory (thus, no need fromAdditional signaling for UE), while for R _ST >Support of 1 is optional (thus, additional signaling is required if supported by the UE). FIG. 1 3 shows two R _ST Value (R) _ST =1, 2), wherein, when R _ST When=1, ST is not divided (i.e., 2 time instances form ST), and when R _ST When=2, each ST is divided into two parts (2 time instances form one ST, which is divided into 2 parts, each part having 1 time instance). When R is _ST >1, a total of N ₄ The individual precoding matrices are reported (via PMIs), one for each ST unit/component, where when each ST is divided into R _ST In the case of the individual portions of the sheet,and in general terms, the number of the cells,wherein->Is the sum of ST, P _ST The number of parts being the first ST, Q _ST The number of parts that are the last ST and P _ST ，Q _ST ∈{1，...R _ST }。

In one example ii.1.3, a RBs are divided, but B time instances are not. In one example, this may be configured to the UE when the frequency granularity of CQI reports is configured (e.g., by higher layers) as "per SB" and the time granularity of CQI reports is configured (e.g., by higher layers) as "wide time" or "common" or "single. Together, a total ofThe CQI values are reported. Details of the division of A RBs, one for each ST, are according to example II.1.1.

In one example ii.1.4, B time instances are partitioned, but a RBs are not partitioned. In one example, when the frequency granularity of CQI reports is configured (e.g., by higher layers) to be "per ST" and the time granularity of CQI reports is configured When "wideband" is set (e.g., by higher layers), this may be configured to the UE. Together, a total ofThe CQI values are reported. Details of the partitioning of the B time instances, one for each SB, is according to example II.1.2.

In one example ii.1.5, both a RBs and B time instances are partitioned. In one example, this may be configured to the UE when the frequency granularity of CQI and/or PMI reporting is configured (e.g., by higher layers) as "per SB" and the time granularity of CQI and/or PMI reporting is configured (e.g., by higher layers) as "per ST". Details of the division of A RBs are according to example II.1.1. Details of the partitioning of the B time instances are according to example ii.1.2. Together, a total ofThe CQI values and/or precoding matrices are reported, one for each (SD, ST).

In the above example, the PMI may indicate a precoding matrix for each SB and/or each ST, where the precoding matrix for all SBs and/or all STs is determined (calculated) based on a combination of Frequency Domain (FD) compression and/or DD compression, where DD compression is performed as described in the present disclosure, and FD compression is performed similar to that in the rel.16 enhanced type II codebook. Parameters A, N _SB And R determines N ₃ Is used/selected to perform FD compression (see rel.16 enhanced type II codebook). Likewise, parameter B, N _ST And R is _ST Determining N ₄ Is used/selected to perform DD compression.

In one example II.1.6, the parameters of SB (e.g., N _SB Parameters of R) and ST (e.g., N _ST 、R _ST ) The configuration of (a) may be separate (e.g., via separate parameters) or joint (e.g., via joint parameters). For example, SB size N _SB And ST size N _ST May be configured separately (e.g., via separate higher layer parameters). Alternatively, they may beConfigured jointly (e.g., via joint high-level parameters). When configured jointly, a pair (N _SB ，N _ST ) The values are configured, where N _SB Can be from the set S _SB Take on value in (e.g., {4,8 }), and N _ST Can be from the set S _ST Take on value in (e.g., {2,4 }), or (N) _SB ，N _ST ) Values are taken from a set S of pairs (e.g., { (2, 2), (2, 4), (4, 2) }). In one example, when (N _SB ，N _ST ) When a value is taken from the set S of pairs, the set includes pairs (a, b) satisfying the condition. In one example, the condition corresponds to a×b=c, where c is fixed. For example, when c=4, the set s= { (4, 1), (2, 2), (1, 4) }.

Any of the above-described variant embodiments may be used independently or in combination with at least one other variant embodiment.

Fig. 23 shows a flowchart of a method 2300 for operating a UE, which may be performed by a UE such as UE 116, in accordance with an embodiment of the present disclosure. The embodiment of method 2300 shown in FIG. 23 is for illustration only. Fig. 23 is not intended to limit the scope of the present disclosure to any particular implementation.

As shown in fig. 23, method 2300 begins at step 2302. In step 2302, the UE (e.g., 111-116 as shown in fig. 1) receives a configuration for Channel State Information (CSI) reporting, the configuration including information regarding B including CSI-RS transmissions>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances.

In step 2304, the UE measures CSI-RS bursts.

In step 2306, the UE determines a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit.

In step 2308, the UE transmits a CSI report including an indication of the TD or DD component of the DL channel.

In one embodiment, N _ST Is determined based on higher layer Radio Resource Control (RRC) parameters.

In one embodiment, the number of TD units (N ₄ ) Based onB and N _ST To determine.

In one embodiment, the TD or DD component includes a plurality of basis vectors, wherein each basis vector is R _ST N ₄ X 1, wherein R is _sT 1 or more, wherein R _ST Is the number of precoding matrices within each TD unit.

In one embodiment, R _ST Is configured via high-level parameters.

In one embodiment, the configuration includes information about the granularity of the TD report of the quantity, the CSI report includes the quantity, and the quantity is based on the TD or DD component of the DL channel.

In one embodiment, the amount is a Precoding Matrix Indicator (PMI) or a Channel Quality Indicator (CQI), and the TD reporting granularity is jointly configured with a frequency domain granularity of the CQI or PMI via higher layer parameters.

In one embodiment, the TD reporting granularity is a Wide Time (WT) or a sub-time (ST), where WT corresponds to the amount reported for all B time instances and ST corresponds to the amount reported for each TD unit within B time instances.

Fig. 24 shows a flowchart of another method 2400 that may be performed by a Base Station (BS), such as BS102, in accordance with an embodiment of the present disclosure. The embodiment of method 2400 shown in fig. 24 is for illustration only. Fig. 24 does not limit the scope of the present disclosure to any particular implementation.

As shown in fig. 24, method 2400 begins with step 2402. In step 2402, the BS (e.g., 101-103 as shown in fig. 1) generates a configuration for Channel State Information (CSI) reporting including information about the B including CSI-RS transmission >CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances.

In step 2404, the BS transmits the configuration.

In step 2406, the BS transmits a CSI-RS burst.

In step 2408, the BS receives a CSI report including an indication of a TD or Doppler Domain (DD) component of a Downlink (DL) channel, wherein the TD or DD component of the DL channel is based on the CSI-RS burst and the TD unit.

In one embodiment, N _ST Is based on higher layer Radio Resource Control (RRC) parameters.

In one embodiment, the number of TD units (N ₄ ) Based on B and N _ST Is determined.

In one embodiment, R _ST Is configured via high-level parameters.

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

Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to embrace such alterations and modifications that fall within the scope of the appended claims. Any description of the present application should not be construed as implying that any particular element, step, or function is an essential element which must be included in the scope of the claims. The scope of patented subject matter is defined by the claims.

Fig. 25 illustrates a structure of a UE according to an embodiment of the present disclosure.

As shown in fig. 25, a UE according to an embodiment may include a transceiver 2510, a memory 2520, and a processor 2530. The transceiver 2510, memory 2520 and processor 2530 of the UE may operate according to the UE communication methods described above. However, components of the UE are not limited thereto. For example, the UE may include more or fewer components than those described above. Further, the processor 2530, the transceiver 2510 and the memory 2520 may be implemented as a single chip. Further, the processor 2530 may include at least one processor. Further, the UE of fig. 25 corresponds to the UE of fig. 3.

The transceiver 2510 is collectively referred to as a UE receiver and a UE transmitter, and may transmit/receive signals to/from a base station or a network entity. The signals transmitted to or received from the base station or network entity may include control information and data. The transceiver 2510 may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, and an RF receiver for amplifying the frequency of a low noise and down-converted received signal. However, this is merely an example of a transceiver 2510 and components of transceiver 2510 are not limited to RF transmitters and RF receivers.

Further, the transceiver 2510 may receive signals through a wireless channel and output them to the processor 2530, and transmit signals output from the processor 2530 through a wireless channel.

The memory 2520 may store programs and data required for operation of the UE. Further, the memory 2520 may store control information or data included in a signal obtained by the UE. The memory 2520 may be a storage medium such as Read Only Memory (ROM), random Access Memory (RAM), a hard disk, a CD-ROM, and a DVD, or a combination of storage media.

The processor 2530 may control a series of processes such that the UE operates as described above. For example, the transceiver 2510 may receive a data signal including a control signal transmitted by a base station or a network entity, and the processor 2530 may determine a result of receiving the control signal and the data signal transmitted by the base station or the network entity.

Fig. 26 illustrates a structure of a base station according to an embodiment of the present disclosure.

As shown in fig. 26, a base station according to an embodiment may include a transceiver 2610, a memory 2620, and a processor 2630. The transceiver 2610, the memory 2620 and the processor 2630 of the base station may operate according to the communication method of the base station described above. However, the components of the base station are not limited thereto. For example, a base station may include more or fewer components than those described above. In addition, the processor 2630, the transceiver 2610, and the memory 2620 may be implemented as a single chip. Further, the processor 2630 may include at least one processor. Further, the base station of fig. 26 corresponds to the BS of fig. 2.

The transceiver 2610 is collectively referred to as a base station receiver and a base station transmitter, and may transmit/receive signals to/from a terminal (UE) or a network entity. The signals transmitted to or received from the terminal or network entity may include control information and data. The transceiver 2610 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for amplifying the frequency of the low noise and down-converted received signal. However, this is merely an example of a transceiver 2610, and components of transceiver 2610 are not limited to RF transmitters and RF receivers.

In addition, the transceiver 2610 may receive a signal through a wireless channel and output it to the processor 2630, and transmit a signal output from the processor 2630 through a wireless channel.

The memory 2620 may store programs and data required for the operation of the base station. In addition, the memory 2620 may store control information or data included in a signal obtained by the base station. The memory 2620 may be a storage medium such as read-only memory (ROM), random-access memory (RAM), hard disk, CD-ROM, and DVD, or a combination of storage media.

The processor 2630 may control a series of processes such that the base station operates as described above. For example, the transceiver 2610 may receive a data signal including a control signal transmitted by a terminal, and the processor 2630 may determine a result of receiving the control signal and the data signal transmitted by the terminal.

According to various embodiments, a User Equipment (UE) includes: at least one transceiver configured to: receiving a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI-RS transmissions>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; and at least one processor operably coupled to the at least one transceiver, the at least one processor configured to: measuring a CSI-RS burst; and determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit, wherein the at least one transceiver is configured to transmit a CSI report including an indication of the TD or DD component of the DL channel.

In one embodiment, where N _ST Is determined based on higher layer Radio Resource Control (RRC) parameters.

In one embodiment, wherein the at least one processor is further configured to be based on B and N _ST To determine the number of TD units (N ₄ )。

In one embodiment, wherein the TD or DD component includes a plurality of basis vectors, wherein each basis vector is R _ST N ₄ X 1, wherein R is _ST 1 or more, wherein R _ST Is the number of precoding matrices within each TD unit.

In one embodiment, wherein R _ST Is configured via high-level parameters.

In one embodiment, wherein: the configuration includes information about the granularity of the TD report of the quantity, the CSI report includes the quantity, and the quantity is based on the TD or DD component of the DL channel.

In one embodiment, wherein: the quantity is a Precoding Matrix Indicator (PMI) or a Channel Quality Indicator (CQI), and the TD reporting granularity is jointly configured with a frequency domain granularity of the CQI or PMI via higher layer parameters.

In one embodiment, where the TD reporting granularity is either a Wide Time (WT) or a sub-time (ST), where WT corresponds to the amount reported for all B time instances and ST corresponds to the amount reported for each TD unit within B time instances.

According to various embodiments, a Base Station (BS) includes: at least one processor configured to: generating a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI-RS transmissions>CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; and at least one transceiver operably coupled to the at least one processor, the at least one transceiver configured to: transmitting configuration; transmitting a CSI-RS burst; and receiving a CSI report including an indication of a TD or Doppler Domain (DD) component of a Downlink (DL) channel, wherein the TD or DD component of the DL channel is based on the CSI-RS burst and the TD unit.

In one embodiment, where N _ST Is based on higher layer Radio Resource Control (RRC) parameters.

In one embodiment, wherein the number of TD units (N ₄ ) Based on B and N _ST Is determined.

In one embodiment, wherein R _ST Is configured via high-level parameters.

In one embodiment, wherein: the configuration includes information about the granularity of the TD report of the quantity, the CSI report including the quantity, and the quantity being based on the TD or DD component of the DL channel.

According to various embodiments, a method performed by a User Equipment (UE), the method comprising: receiving a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI-RS transmissions >CSI reference signal (CSI-RS) burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; measuring a CSI-RS burst; determining a TD or Doppler Domain (DD) component of a Downlink (DL) channel based on the measurement of the CSI-RS burst and the TD unit; and transmitting a CSI report including an indication of the TD or DD component of the DL channel.

In one embodiment, further comprising determining N based on higher layer Radio Resource Control (RRC) parameters _ST Is a value of (2).

In one embodiment, further comprising B and N based _ST To determine the number of TD units (N ₄ )。

Claims

1. A User Equipment (UE), the UE comprising:

at least one transceiver configured to:

receiving a configuration for Channel State Information (CSI) reporting, the configuration including information regarding a B including CSI reference signal, CSI-RS, transmission>CSI-RS burst and including N for 1 time instance _ST Information of Time Domain (TD) units of successive time instances; and

at least one processor operably coupled to the at least one transceiver, the at least one processor configured to:

Measuring a CSI-RS burst; and

based on the measurement of the CSI-RS burst and the TD unit, determining the TD or Doppler Domain (DD) component of the Downlink (DL) channel,

wherein the at least one transceiver is configured to transmit a CSI report comprising an indication of the TD or DD component of the DL channel.

2. The UE of claim 1, wherein N _ST Is determined based on higher layer Radio Resource Control (RRC) parameters.

3. The UE of claim 1, wherein the at least one processor is further configured to be based on B and N _ST To determine the number of TD units (N ₄ )。

4. The UE of claim 3, wherein the TD or DD component comprises a plurality of basis vectors, wherein each basis vector is R _ST N ₄ X 1, wherein R is _ST 1 or more, wherein R _ST Is the number of precoding matrices within each TD unit.

5. The UE of claim 4, wherein R _ST Is configured via high-level parameters.

6. The UE of claim 1, wherein:

the configuration includes information about the granularity of the amount of TD reporting,

the CSI report includes the quantity, and

the amount is based on the TD or DD component of the DL channel.

7. The UE of claim 6, wherein:

the quantity is a Precoding Matrix Indicator (PMI) or a Channel Quality Indicator (CQI), and

The TD reporting granularity is jointly configured with the frequency domain granularity of CQI or PMI via higher layer parameters.

8. The UE of claim 6, wherein the TD reporting granularity is either a Wide Time (WT) or a sub-time (ST), where WT corresponds to an amount reported for all B time instances and ST corresponds to an amount reported for each TD unit within B time instances.

9. A Base Station (BS), comprising:

at least one processor configured to:

generating a configuration for Channel State Information (CSI) reporting, the configuration comprising information about

CSI-RS burst including B >1 time instances of CSI reference signal CSI-RS transmission, and

comprising N _ST Time domain TD units of successive time instances; and

at least one transceiver operably coupled to the at least one processor, the at least one transceiver configured to:

transmitting the configuration;

transmitting the CSI-RS burst; and

a CSI report including an indication of a TD or Doppler Domain (DD) component of a Downlink (DL) channel is received,

wherein the TD or DD component of the DL channel is based on the CSI-RS burst and the TD unit.

10. The BS of claim 9, wherein N _ST Is based on higher layer Radio Resource Control (RRC) parameters.

11. The BS of claim 9, wherein the number of TD units (N ₄ ) Based on B and N _ST 。

12. The BS of claim 11, wherein the TD or DD component comprises a plurality of basis vectors, wherein each basis vector is R _ST N ₄ X 1, wherein R is _ST 1 or more, wherein R _ST Is the number of precoding matrices within each TD unit.

13. The BS of claim 12, wherein R _ST Is configured via high-level parameters.

14. The BS of claim 9, wherein:

the CSI report includes the quantity, and

the amount is based on the TD or DD component of the DL channel.

15. The BS of claim 14, wherein: