METHOD AND APPARATUS FOR REPORTING CHANNEL STATE INFORMATION IN AN advanced MIMO ANTENNA SYSTEM FOR CELLULAR COMMUNICATION

Abstract

The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond 4G communication systems such as Long Term Evolution (LTE). The method for channel state information reporting includes: receiving information for analog beams and R CSI-RS resources; constructing an analog beam codebook; deriving a PMI set corresponding to the plurality of analog beams; identifying a digital beam set corresponding to each analog beam; identifying a hybrid beam set corresponding to each of the R CSI-RS resources, wherein the hybrid beam set comprises a digital beam set and an analog beam; identifying a subset of the set of hybrid beams using the index to generate PMIs corresponding to the plurality of analog beams; and transmitting a CSI report including the PMI and a subset of the hybrid beam set.

Description

Technical Field

[0001] The present disclosure relates to wireless communication systems. More particularly, the present disclosure relates to channel state information (CSI) reporting in advanced multiple-input multiple-output (MIMO) antenna systems in wireless communication systems. Background Art

[0002] Considering the development of wireless communication from one generation to another, technologies have been developed mainly for services targeting humans, such as voice calls, multimedia services, and data services. After the commercialization of the fifth generation (5G) communication system, it is expected that the number of connected devices will grow exponentially. These will be increasingly connected to the communication network. Examples of connected things can include vehicles, robots, dashboards, home appliances, displays, smart sensors connected to various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to develop in various form factors, such as augmented reality glasses, virtual reality headsets, and holographic devices. In order to provide various services by connecting tens of billions of devices and things in the 6th generation (6G) era, efforts have been made to develop improved 6G communication systems. For these reasons, 6G communication systems are called super 5G systems.

[0003] The 6G communication system, which is expected to be commercialized around 2030, will have a peak data rate of Tal (1,000Giga)-level bits per second (bps) and a radio latency of less than 100μsec, and will therefore be 50 times faster than a 5G communication system and have 1 / 10 of its radio latency.

[0004] In order to achieve such high data rates and ultra-low latency, the implementation of 6G communication systems in the terahertz (THz) band (e.g., 95 gigahertz (GHz) to 3THz band) has been considered. It is expected that due to more severe path loss and atmospheric absorption in the terahertz band than in the mmWaveband introduced in 5G, technologies that can ensure signal transmission distance (i.e., coverage) will become more critical. As the main technology for protecting coverage, it is necessary to develop radio frequency (RF) elements, antennas, novel waveforms with better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and a large number of multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, and multi-antenna transmission technologies such as massive antennas. In addition, new technologies for improving the coverage of terahertz band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable smart surfaces (RIS), have been continuously discussed.

[0005] In addition, in order to improve spectrum efficiency and overall network performance, the following technologies have been developed for 6G communication systems: full-duplex technology for enabling uplink transmission and downlink transmission to use the same frequency resources simultaneously; network technology that makes comprehensive use of satellites, high altitude platform stations (HAPS), etc.; improved network structure that supports mobile base stations, etc., to achieve network operation optimization and automation, etc.; dynamic spectrum sharing technology through conflict avoidance based on spectrum usage prediction; use of artificial intelligence (AI) in wireless communications to improve overall network operations by utilizing AI and internalizing end-to-end AI support functions from the design stage of developing 6G; and next-generation distributed computing technology to overcome the limitations of UE computing capabilities through ultra-high performance communication and computing resources accessible on the network, such as mobile edge computing (MEC), cloud, etc. In addition, by designing new protocols used in 6G communication systems, developing mechanisms for achieving hardware-based security environments and secure use of data, and developing technologies for maintaining privacy, attempts are made to strengthen connections between devices, optimize networks, promote the softening of network entities, and increase the openness of wireless communications.

[0006] It is expected that research and development of 6G communication systems in hyper-connectivity (including human-to-machine (P2M) and machine-to-machine (M2M)) will allow the next hyper-connectivity experience. In particular, it is expected that services such as truly immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas can be provided through 6G communication systems. In addition, services such as remote surgery for safety and reliability enhancement, industrial automation, and emergency response will be provided through 6G communication systems, making the technology applicable to various fields such as industry, medical care, automobiles, and home appliances. Summary of the invention

[0007] Technical issues

[0008] Currently, there is a need to enhance CSI reporting in advanced MIMO antenna systems in wireless communication systems.

[0009] The present disclosure relates to wireless communication systems, and more particularly, to CSI reporting in advanced MIMO antenna systems in wireless communication systems.

[0010] In one embodiment, a user equipment (UE) is provided. The UE includes a transceiver configured to receive information for (i) an analog beam and (ii) R CSI reference signal (R CSI-RS) resources. The UE also includes a processor operably connected to the transceiver, the processor configured to: construct an analog beam codebook based on the information for the analog beam, derive R precoding matrix indicator (PMI) sets corresponding to multiple analog beams based on the analog beam codebook and the measurement of the R CSI-RS resources, wherein each of the R PMI sets corresponds to an analog beam in the multiple analog beams associated with the R CSI-RS resources, and identify a digital beam set corresponding to each of the multiple analog beams based on a channel estimation operation. Identify a hybrid beam set corresponding to each of R CSI-RS resources, wherein the hybrid beam set includes a digital beam set and an analog beam, respectively, and use an index to identify a subset of the hybrid beam set to generate a PMI and (ii) multiple analog beams, wherein the transceiver is also configured to send a CSI report, the CSI report including (1) the PMI and (ii) the subset of the hybrid beam set.

[0011] In another embodiment, a method of a UE is provided. Receive information for (i) an analog beam and (ii) R CSI-RS resources; construct an analog beam codebook based on the information of the analog beam; derive R PMI sets corresponding to multiple analog beams based on the analog beam codebook and the measurement of the R CSI-RS resources, wherein each of the R PMI sets corresponds to an analog beam in multiple analog beams associated with the R CSI-RS resources; identify a digital beam set corresponding to each analog beam based on a channel estimation operation; identify a hybrid beam set corresponding to each of the R CSI-RS resources, the hybrid beam set including a digital beam set and an analog beam, respectively; identify a subset of the hybrid beam set using an index to generate a PMI corresponding to multiple analog beams; and send a CSI report, the CSI report including (i) the PMI and (ii) the subset of the hybrid beam set.

[0012] In another embodiment, a base station (BS) is provided. The BS includes a processor. The BS also includes a transceiver operably connected to the processor, the transceiver being configured to: send information for (i) an analog beam and (ii) R CSI-RS resources, and receive a CSI report, the CSI report including (i) a PMI and (ii) a subset of a hybrid beam set, wherein: an analog beam codebook is constructed based on the information for the analog beam, R PMI sets corresponding to the analog beam are derived based on the analog beam codebook and the measurement of the R CSI-RS resources, each of the R PMI sets corresponds to one of a plurality of analog beams associated with the R CSI-RS resources, a digital beam set corresponding to each analog beam is identified based on a channel estimation operation, a hybrid beam set corresponding to each of the R CSI-RS resources is identified, the hybrid beam set includes a group digital beam set and an analog beam, respectively, and a subset of the hybrid beam set is identified using an index to generate R PMIs corresponding to a plurality of analog beams.

[0013] Other technical features will be apparent to those skilled in the art from the following drawings, description and claims.

[0014] Before proceeding to the following detailed description, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document. The term "connection" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are in physical contact with each other. The terms "send", "receive" and "communication" and their derivatives include direct and indirect communication. The terms "include" and "comprise" and their derivatives are intended to include without limitation. The term "or" is inclusive, meaning and / or. The phrase "associated with" and its derivatives mean to include, be included in, interconnect with, include, be included in, be connected to or connected with, be connected to or connected with, communicate with, collaborate with, interweave, parallel, approach, be bound to or bound with, have, have the characteristics of, have a relationship with, etc. The term "controller" refers to any device, system or part thereof that controls at least one operation. Such a controller can 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 local or remote. The phrase "at least one of," when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one of the items in the list may be required. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

[0015] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and is contained in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data, or parts thereof suitable for implementation in appropriate computer-readable program codes. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. "Non-transitory" computer-readable media excludes wired, wireless, optical or other communication links that transmit temporary electrical or other signals. A non-transitory computer-readable medium includes a medium that can permanently store data, and a medium that can store data and then rewrite data, such as a rewritable optical disc or an erasable storage device.

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

[0017] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0018] Figure 1 An example of a wireless network according to an embodiment of the present disclosure is shown;

[0019] Figure 2 An example of a gNB according to an embodiment of the present disclosure is shown;

[0020] Figure 3 An example of a UE according to an embodiment of the present disclosure is shown;

[0021] Figure 4 shows examples of wireless transmit and receive paths according to the present disclosure;

[0022] Figure 5 shows examples of wireless transmit and receive paths according to the present disclosure;

[0023] Figure 6 An example of an antenna structure according to an embodiment of the present disclosure is shown;

[0024] Figure 7An example of an antenna panel at a BS according to an embodiment of the present disclosure is shown;

[0025] Figure 8 An example of an antenna panel including N1N2 sub-arrays per polarization dimension according to an embodiment of the present disclosure is shown;

[0026] Fig. 9 An example of an RF front end and baseband according to an embodiment of the present disclosure is shown;

[0027] Fig.10 shows a signaling flow for CSI measurement and reporting according to an embodiment of the present disclosure;

[0028] Fig.11 An example of a digital beam corresponding to each CSI-RS resource according to an embodiment of the present disclosure is shown;

[0029] Fig.12 An example of a subset of L digital beam selections per polarization on R CSI-RS resources according to an embodiment of the present disclosure is shown;

[0030] Fig.13 A flowchart of a method for a UE according to an embodiment of the present disclosure is shown;

[0031] Fig.14 is a block diagram showing a structure of a user equipment (UE) according to an embodiment of the present disclosure; and

[0032] Fig.15 is a block diagram showing the structure of a base station (BS) according to an embodiment of the present disclosure.

[0033] Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. DETAILED DESCRIPTION

[0034] Fifth generation (5G) or new radio (NR) mobile communications are gathering increasing momentum recently with worldwide technical activities from industry and academia on various candidate technologies. Candidate enablers for 5G / NR mobile communications include massive antenna technology from traditional cellular bands up to high frequencies to provide beamforming gain and support increased capacity; new waveforms (e.g., new radio access technologies (RATs)) that flexibly adapt to various services / applications with different requirements; new multiple access schemes that support a large number of connections, etc.

[0035] Discussed below Figures 1 to 15The various embodiments used to describe the principles of the present disclosure in this patent document are merely exemplary and should not be interpreted in any way to limit the scope of the present disclosure. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any suitably arranged system or device.

[0036] In order to meet the demand for wireless data services that have increased since the deployment of 4G communication systems, and to realize various vertical applications, 5G / NR communication systems have been developed and are currently being deployed. 5G / NR communication systems are considered to be implemented in higher frequency (mmWave) bands (e.g., 28 GHz or 60 GHz bands) to achieve higher data rates, or in lower frequency bands (e.g., 6 GHz) to achieve robust coverage and mobility support. In order to reduce the propagation loss of radio waves and increase the transmission distance, in 5G / NR communication systems, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed.

[0037] In addition, in the 5G / NR communication system, system network improvements are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc.

[0038] The discussion of 5G systems and frequency bands associated therewith is for reference, as certain embodiments of the present disclosure may be implemented in 5G systems. 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 bands. For example, aspects of the present disclosure may also be applied to the deployment of 5G communication systems, 6G, or even later versions that may use terahertz (THz) frequency bands.

[0039] The following Figures 1 to 3 Various embodiments are described for implementing and using Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication techniques in a wireless communication system. Figures 1 to 3 The description is not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the disclosure may be implemented in any suitably arranged communications system.

[0040] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown. Figure 1 The embodiment of the wireless network shown is for illustration only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present disclosure.

[0041] like Figure 1As shown, the wireless network includes gNB 101 (e.g., base station BS), gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130, such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

[0042] The gNB 102 provides wireless broadband access to a network 130 for a plurality of first user equipments (UEs) within a coverage area 120 of the gNB 102. The plurality of first UEs include a UE 111, which may be located in a small business; a UE 112, which may be located in an enterprise; a UE 113, which may be a WiFi hotspot; a UE 114, which may be located in a first residence; a UE 115, which may be located in a second residence; and a UE 116, which may be a mobile device, such as a cellular phone, a wireless laptop, a wireless PDA, etc. The gNB 103 provides wireless broadband access to the network 130 for a plurality of second UEs within a coverage area 125 of the gNB 103. The plurality of second UEs include 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 / NR, Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-A), WiMAX, WiFi, or other wireless communication technologies.

[0043] Depending on the network type, the term "base station" or "BS" may refer to any component (or collection of components) configured to provide wireless access to a network, such as a transmission point (TP), a transmission-reception point (TRP), an enhanced base station (eNodeB or eNB), a 5G / NR base station (gNB), a macro cell, a femto cell, a WiFi access point (AP), or other wireless enabling devices. A base station may provide wireless access according to one or more wireless communication protocols, such as 5G / NR Third Generation Partnership Project (3GPP) 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 network infrastructure components that provide wireless access to remote terminals. In addition, 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 a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (such as a desktop computer or vending machine).

[0044] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with gNBs, such as coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the gNB and changes in the radio environment associated with natural and man-made obstacles.

[0045] As described in more detail below, one or more of UEs 111-116 include circuitry, programming, or a combination thereof for CSI reporting in an advanced MIMO antenna system in a wireless communication system. In certain embodiments, one or more of gNBs 101-103 include circuitry, programming, or a combination thereof to support CSI reporting in an advanced MIMO antenna system in a wireless communication system.

[0046] although Figure 1 An example of a wireless network is shown, but Figure 1 Various changes may be made. For example, the wireless network may include any number of gNBs and any number of UEs. In addition, gNB 101 may communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 may communicate directly with network 130 and provide the UEs with direct wireless broadband access to network 130. In addition, gNBs 101, 102, and / or 103 may provide access to other or additional external networks, such as an external telephone network or other types of data networks.

[0047] Figure 2 An exemplary gNB 102 according to an embodiment of the present disclosure is shown. Figure 2 The embodiment of gNB 102 shown is for illustration only. Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs have various configurations, and Figure 2 The scope of this disclosure is not limited to any particular implementation of gNB.

[0048] like Figure 2 As shown, the gNB 102 includes multiple antennas 205a-205n, multiple transceivers 210a-210n, a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0049] The transceivers 210a-210n receive incoming RF signals from the antennas 205a-205n, such as signals transmitted by UEs in the network 100. The transceivers 210a-210n downconvert the incoming RF signals to produce IF or baseband signals. The IF or baseband signals are processed by receive (RX) processing circuits in the transceivers 210a-210n and / or the controller / processor 225, which generate processed baseband signals by filtering, decoding and / or digitizing the baseband or IF signals. The controller / processor 225 may further process the baseband signals.

[0050] Transmit (TX) processing circuitry in the transceivers 210a-210n and / or the controller / processor 225 receives analog or digital data (e.g., voice data, web data, email, or interactive video game data) from the controller / processor 225. The TX processing circuitry encodes, multiplexes, and / or digitizes the output baseband data to produce a processed baseband or IF signal. The transceivers 210a-210n up-convert the baseband or IF signal to an RF signal that is transmitted via the antennas 205a-205n.

[0051] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 225 may control the reception of UL channel signals and the transmission of DL channel signals by the transceivers 210a-210n in accordance with well-known principles. The controller / processor 225 may also support additional functionality, such as more advanced wireless communication functionality. For example, the controller / processor 225 may support beamforming or directional routing operations, in which output / input signals from / to multiple antennas 205a-205n are weighted differently to effectively steer the output signals in a desired direction. Any of a variety of other functions may be supported in the gNB 102 via the controller / processor 225.

[0052] The controller / processor 225 is also capable of executing programs and other processes resident in the memory 230, such as processes for supporting CSI reporting in advanced MIMO antenna systems in wireless communication systems. The controller / processor 225 can move data into or out of the memory 230 as required by the executing process.

[0053] The controller / processor 225 is also connected to a backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or via a network. The interface 235 can support communication via any appropriate wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (e.g., a system supporting 5G / NR, LTE, or LTE-A), the interface 235 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 can allow the gNB 102 to communicate with a larger network (e.g., the Internet) via a wired or wireless local area network or via a wired or wireless connection. The interface 235 includes any suitable structure that supports communication via a wired or wireless connection (e.g., Ethernet or a transceiver).

[0054] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, while another portion of memory 230 may include flash memory or other ROM.

[0055] although Figure 2 An example of a gNB 102 is shown, but the Figure 2 For example, gNB 102 may include Figure 2 Any quantity of each component shown. In addition, Figure 2 The various components in may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

[0056] Figure 3 An example UE 116 is shown according to an embodiment of the present disclosure. Figure 3 The embodiment of UE 116 shown is for illustration only. Figure 1 UEs 111-115 may have the same or similar configurations. However, UEs may have a variety of configurations, and Figure 3 The scope of the present disclosure is not limited to any particular implementation of a UE.

[0057] like Figure 3 As shown, UE 116 includes antenna 305, transceiver 310, and microphone 320. UE 116 also includes speaker 330, processor 340, input / output (I / O) interface (IF) 345, input 350, display 355, and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0058] Transceiver 310 receives an incoming RF signal from antenna 305 that is transmitted by a gNB of network 100. Transceiver 310 downconverts the incoming RF signal to produce an intermediate frequency (IF) or baseband signal. The IF or baseband signal is processed by RX processing circuitry in transceiver 310 and / or processor 340, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. The RX processing circuitry transmits the processed baseband signal to speaker 330 (e.g., for voice data) or is processed by processor 340 (e.g., for web browsing data).

[0059] The TX processing circuit in the transceiver 310 and / or the processor 340 receives analog or digital voice data from the microphone 320 or other output baseband data (e.g., web data, email, or interactive video game data) from the processor 340. The TX processing circuit encodes, multiplexes, and / or digitizes the output baseband data to produce a processed baseband or IF signal. The transceiver 310 up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 305.

[0060] The processor 340 may include one or more processors or other processing devices and execute the OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor 340 may control the transceiver 310 to receive downlink channel signals and transmit uplink channel signals according to well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0061] The processor 340 may also be capable of executing other processes and programs resident in the memory 360, such as processes for CSI reporting in an advanced MIMO antenna system in a wireless communication system.

[0062] Processor 340 can move data into or out of memory 360 as needed for the execution process. In some embodiments, processor 340 is configured to execute application 362 based on OS 361 or in response to a signal received from a gNB or operator. Processor 340 is also coupled to I / O interface 345, which provides UE 116 with the ability to connect to other devices such as laptops and handheld computers. I / O interface 345 is the communication path between these accessories and processor 340.

[0063] Processor 340 is also coupled to input 350 and display 355m (including, for example, a touch screen, a keypad, etc.). An operator of UE 116 can use input 350 to enter data into UE 116. Display 355 can be a liquid crystal display, a light emitting diode display, or other display capable of presenting text and / or at least limited graphics, such as from a website.

[0064] Memory 360 is coupled to processor 340. A portion of memory 360 may include random access memory (RAM), and another portion of memory 360 may include flash memory or other read-only memory (ROM).

[0065] although Figure 3 An example of UE 116 is shown, but the Figure 3 Make various changes. For example, Figure 3 The various components in may be combined, further subdivided, or omitted, and additional components may be added as required. As a specific example, processor 340 may be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). In another example, transceiver 310 may include any number of transceivers and signal processing chains, and may be connected to any number of antennas. In addition, although Figure 3 The UE 116 is shown configured as a mobile phone or smart phone, but the UE may be configured to operate as other types of mobile or stationary devices.

[0066] Figure 4 and Figure 5 Exemplary wireless transmit and receive paths according to the present disclosure are shown. In the following description, transmit path 400 may be described as being implemented in a gNB (e.g., gNB 102) and receive path 500 may be described as being implemented in a UE (e.g., UE 116). However, it is understood that receive path 500 may be implemented in a gNB and transmit path 400 may be implemented in a UE. In some embodiments, receive path 500 is configured to support CSI reporting in an advanced MIMO antenna system in a wireless communication system.

[0067] like Figure 4 The transmit path 400 shown includes a channel coding and modulation block 405, a serial to parallel (S-to-P) block 410, a size N inverse fast Fourier transform (IFFT) block 415, a parallel to serial (P-to-S) block 420, an add cyclic prefix block 425, and an upconverter (UC) 430. Figure 5 The illustrated receive path 500 includes a downconverter (DC) 555, a remove cyclic prefix block 560, a serial to parallel (S to P) block 565, a size N fast Fourier transform (FFT) block 570, a parallel to serial (P to S) block 575, and a channel decoding and demodulation block 580.

[0068] like Figure 4As shown, the channel coding and modulation block 405 receives a set of information bits, applies coding (e.g., low-density parity check (LDPC) coding), and modulates the input bits (e.g., with quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to produce a frequency-domain modulation symbol sequence.

[0069] Serial to parallel block 410 converts (e.g., demultiplexes) the serial modulation symbols into parallel data to generate N parallel symbol streams, where N is the IFFT / FFT size used in gNB 102 and UE 116. Size NIFFT block 415 performs an IFFT operation on the N parallel symbol streams to generate a time domain output signal. Parallel to serial block 420 converts (e.g., multiplexes) the parallel time domain output symbols from Size NIFFT block 415 to generate a serial time domain signal. Add cyclic prefix block 425 inserts a cyclic prefix to the time domain signal. Up converter 430 modulates (e.g., upconverts) the output of add cyclic prefix block 425 to RF frequency for transmission via a wireless channel. The signal may also be filtered at baseband before conversion to RF frequency.

[0070] The transmitted RF signal from gNB 102 reaches UE 116 after passing through the wireless channel, and reverse operations to those at gNB 102 are performed at UE 116.

[0071] like Figure 5 As shown, the down converter 555 down-converts the received signal to the baseband frequency, and the remove cyclic prefix block 560 removes the cyclic prefix to generate a serial time domain baseband signal. The serial to parallel block 565 converts the time domain baseband signal into a parallel time domain signal. The size N FFT block 570 performs an FFT algorithm to generate N parallel frequency domain signals. The parallel to serial block 575 converts the parallel frequency domain signals into a modulated data symbol sequence. The channel decoding and demodulation block 580 demodulates and decodes the modulated symbols to recover the original input data stream.

[0072] Each of gNBs 101-103 may implement a similar method to that of sending a downlink signal to UEs 111-116. Figure 4 The transmission path 400 shown in FIG. 4 and may be implemented similarly to the transmission path 400 received from UEs 111-116 in the uplink. Figure 5 Receive path 500 is shown. Similarly, each of UEs 111-116 can implement transmit path 400 for transmitting to gNB 101-103 in the uplink, and can implement receive path 500 for receiving from gNB 101-103 in the downlink.

[0073] Figure 4 and Figure 5Each component in may be implemented using hardware only or a combination of hardware and software / firmware. As a specific example, Figure 4 and Figure 5 At least some components in can be implemented with software, while other components can be implemented by configurable hardware or a mixture of software and configurable hardware. For example, FFT block 570 and IFFT block 415 can be implemented as configurable software algorithms, wherein the value of size N can be modified according to implementation.

[0074] In addition, although described as using FFT and IFFT, this is exemplary only and should not be construed as limiting the scope of the present disclosure. Other types of transforms may be used, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions. It will be appreciated that for DFT and IDFT functions, the value of variable N may be any integer (e.g., 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N may be any integer that is a power of 2 (e.g., 1, 2, 4, 8, 16, etc.).

[0075] although Figure 4 and Figure 5 Examples of wireless transmit and receive paths are shown, but Figure 4 and Figure 5 Make various changes. For example, Figure 4 and Figure 5 The various components in may be combined, further subdivided, or omitted, and additional components may be added according to specific needs. Figure 4 and Figure 5 Examples are provided to illustrate the types of transmit and receive paths that may be used in a wireless network. Any other suitable architecture may be used to support wireless communications in a wireless network.

[0076] The unit used for DL ​​signaling or UL signaling on a cell is called a time slot and may include one or more symbols. The bandwidth (BW) unit is called a resource block (RB). One RB includes multiple subcarriers (SC). For example, a time slot may have a duration of 1 millisecond, an RB may have a bandwidth of 180KHz, and include 12 SCs with an inter-SC spacing of 15KHz. A time slot may be a full DL time slot, or a full UL time slot, or a mixed time slot similar to a special subframe in a time division duplex (TDD) system.

[0077] DL signals include data signals that convey information content, control signals that convey DL control information (DCI), and reference signals (RS) also known as pilot signals. The gNB transmits data information or DCI through the corresponding physical DL shared channel (PDSCH) or physical DL control channel (PDCCH). PDSCH or PDCCH can be transmitted on a variable number of time slot symbols including one time slot symbol. The spatial setting for PDCCH reception by the UE can be indicated based on the configuration of the value of the TCI state of the CORESET in which the UE receives the PDCCH. The spatial setting for PDSCH reception by the UE can be indicated based on the configuration of the higher layer or based on the indication of the value of the TCI state of the DCI format that schedules PDSCH reception. The gNB can configure the UE to receive signals on the cell within the DL bandwidth part (BWP) of the cell DL BW.

[0078] The gNB transmits one or more of multiple types of RS including CSI-RS and demodulation RS (DMRS). CSI-RS is mainly used by UE to perform measurements and provide CSI to the gNB. For channel measurement, non-zero power CSI-RS (NZP CSI-RS) resources are used. For interference measurement report (IMR), CSI interference measurement (CSI-IM) resources associated with zero power CSI-RS (ZP CSI-RS) configuration are used. The CSI process consists of NZP CSI-RS and CSI-IM resources. The UE can determine the CSI-RS transmission parameters through DL control signaling or high-level signaling (such as radio resource control (RRC) signaling from the gNB). The transmission instance of CSI-RS can be indicated by DL control signaling or configured by high-level signaling. DMRS is transmitted only in the BW of the corresponding PDCCH or PDSCH, and the UE can use DMRS to demodulate data or control information.

[0079] The UL signal also includes a data signal that transmits information content, a control signal that transmits UL control information (UCI), a DMRS associated with data or UCI demodulation, a sounding RS (SRS) that enables the gNB to perform UL channel measurement, and a random access (RA) preamble that enables the UE to perform random access. The UE transmits data information or UCI through the respective physical UL shared channel (PUSCH) or physical UL control channel (PUCCH). The PUSCH or PUCCH can be transmitted on a variable number of time slot symbols including one time slot symbol. The gNB can configure the UE to transmit the signal on the cell within the UL BWP of the cell UL BW.

[0080] The UCI includes Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) information indicating correct or incorrect detection of a data transport block (TB) in the PDSCH, a Scheduling Request (SR) indicating whether the UE has data in the UE's buffer, and a CSI report that enables the gNB to select appropriate parameters for PDSCH or PDCCH transmission to the UE. The HARQ-ACK information can be configured to have a smaller granularity than per TB and can be per data code block (CB) or per data CB group, where a data TB includes multiple data CBs.

[0081] The CSI report from the UE may include a channel quality indicator (CQI) that informs the gNB of: the maximum modulation and coding scheme (MCS) for the UE to detect a data TB at a predetermined block error rate (BLER); a precoding matrix indicator (PMI) that informs the gNB how to combine signals from multiple transmitter antennas according to the MIMO transmission principle; and a rank indicator (RI) that indicates the transmission rank of the PDSCH. The UL RS includes DMRS and SRS. DMRS is transmitted only in the BW of the corresponding PUSCH or PUCCH transmission. The gNB can use DMRS to demodulate the information in the corresponding PUSCH or PUCCH. The SRS is sent by the UE to provide the gNB with UL CSI, and for TDD systems, the SRS transmission may also provide the PMI for DL ​​transmission. In addition, in order to establish synchronization or an initial higher layer connection with the gNB, the UE may send a physical random access channel.

[0082] In the present disclosure, a beam is determined by any of the following: (1) TCI state, which establishes a quasi co-location (QCL) relationship between a source reference signal (e.g., synchronization signal / physical broadcast channel (PBCH) block (SSB) and / or CSI-RS) and a target reference signal; or (2) spatial relationship information that establishes an association with a source reference signal (e.g., SSB or CSI-RS or SRS). In either case, the ID of the source reference signal identifies the beam.

[0083] The TCI state and / or the spatial relation reference RS may determine a spatial Rx filter for receiving a downlink channel at the UE, or a spatial Tx filter for transmitting an uplink channel from the UE.

[0084] Rel.14 LTE and Rel.15 NR support up to 32 CSI-RS antenna ports, which enables the eNB to be equipped with a large number of antenna elements (e.g., 64 or 128). In this case, multiple antenna elements are mapped to one CSI-RS port. For mmWave band, although the number of antenna elements can be larger for a given form factor, the number of CSI-RS ports (which can correspond to the number of digital precoding ports) is often limited due to hardware constraints (e.g., the feasibility of installing a large number of ADCs / DACs at mmWave frequencies), such as Figure 6 shown.

[0085] Figure 6 An example antenna structure 600 is shown in accordance with an embodiment of the disclosure. Figure 6 The embodiment of antenna structure 600 shown in FIG. 6 is for illustration only.

[0086] In this case, one CSI-RS port is mapped to a large number of antenna elements that can be controlled by a set of analog phase shifters 601. One CSI-RS port can then correspond to a subarray that produces a narrow analog beam through analog beamforming 605. The analog beam can be configured to sweep across a wider range of angles 620 by changing the phase shifter set over a symbol or subframe. The number of subarrays (equal to the number of RF chains) is proportional to the number of CSI-RS ports N. CSI-PORT The digital beamforming unit 610 is the same as N CSI-PORT A linear combination is performed on the analog beams to further increase the precoding gain. While the analog beams are wideband (and therefore not frequency selective), the digital precoding can vary over frequency subbands or resource blocks. Receiver operation can be similarly envisioned.

[0087] Since the above-described system utilizes multiple simulated beams for transmission and reception (wherein, for example, after a training duration, one or a small number of simulated beams are selected from a large number of beams to be performed from time to time), the term "multi-beam operation" is used to refer to the entire system aspect. For the purpose of description, this includes indicating the assigned DL or UL TX beam (also referred to as "beam indication"), measuring at least one reference signal for calculating and performing beam reporting (also referred to as "beam measurement" and "beam reporting", respectively), and receiving DL or UL transmissions via selection of the corresponding RX beam.

[0088] The above system can also be applied to higher frequency bands, such as >52.6 GHz. In this case, the system can only use analog beams. 2Absorption losses (~10dB additional loss @100m distance) may require more and sharper simulated beams (thus more radiators in the array) to compensate for the additional path loss.

[0089] Figure 7 An example 700 of an antenna panel at a BS according to an embodiment of the present disclosure is shown. Figure 7 The embodiment 700 of the antenna panel at the BS shown in FIG. 7 is for illustration only.

[0090] Figure 7 The antenna panel at the BS is shown, including N 1 N 2 The total number of cross-polarized antenna elements is N. T =2N 1 N 2 In the current CSI reporting framework, the UE measures the N-link through periodic, semi-persistent or aperiodic CSI-RS transmission in the downlink as specified in the 3GPP standard specification. T The downlink channel vector on the antenna elements The optimal precoder is reported to the BS using UCI (Uplink Control Information) signaling as shown in the 3GPP standard specification. The precoder can be constructed as defined by the following quantities Kronecker product Defined as an N·K-dimensional vector And the index l∈{0,…,N 1 O 1 -1} and m∈{0,…,N 2 O 2 -1} identifies the beam in the DFT beam codebook. N is configured in the codebook configuration information element (CodebookConfig IE) shown in the 3GPP standard specification through RRC signaling 1 and N 2 The value of and parameters n1-n2, and the tuple (N 1 ,N 2 ) corresponds only to (O 1 ,O 2 )

[0092] Figure 8 It is shown that each polarization dimension according to an embodiment of the present disclosure includes N 1 N 2 Example 800 of an antenna panel with multiple sub-arrays. Figure 8 The dimensions per polarization shown include N 1 N 2 The embodiment 800 of the antenna panel with sub-arrays is for illustration only.

[0093] Figure 8 Describes each polarization dimension including N 1 N 2 The antenna panels of each sub-array are composed of N A =N 3 N 4 The number of subarrays is N. D =2N 1 N 2 In N D Digital beamforming is performed on the N subarrays, and the resulting D Each of the data streams is subjected to analog beamforming at one subarray, using the same analog beam at each subarray.

[0094] Fig. 9 The RF front-end and baseband implementation of the architecture are described.

[0095] Fig. 9 An example 900 of an RF front end and baseband according to an embodiment of the present disclosure is shown. Fig. 9 The illustrated embodiment of the RF front end and baseband 900 is for illustration only.

[0096] In 5G Advanced or 6G communications, it is expected that a very large number of antennas (e.g., N T = 2048) and a large number of subarrays (e.g., N D =128). Analog beamforming is performed on each subarray, and digital beamforming is performed on the subarray, where each subarray is abstracted into 1 digital port. In this article, the existing CSI reporting mechanism as shown in the 3GPP standard specification may no longer be sufficient and may result in large UCI signaling overhead.

[0097] Second, PMI using Type I multi-panel codebook as described in the 3GPP standard specification indicates the use of the same beam on multiple panels and the inter-panel co-phasing factor. This may not be sufficient for adequate coverage when the number of antenna elements and sub-arrays becomes large.

[0098] Therefore, CSI reporting with sufficient granularity at a reasonable UCI signaling cost is critical to obtain sufficiently accurate channel estimation, and thereby achieve MU-MIMO performance through appropriate beamforming.

[0099] The present disclosure provides a new CSI measurement and reporting procedure that is suitable for large antenna arrays at a BS, using multiple CSI-RS resources for each CSI report.

[0100] The following are the key aspects involved in CSI measurement and reporting: (1) The network indicates the simulated beam codebook to the UE via RRC signaling by appending additional information to the CodebookConfigIE as shown in the 3GPP standard specification; (2) The UE constructs a simulated beam codebook similar to the 3GPP standard specification; (3) The network indicates the simulated beam to the UE for each CSI-RS resource: (i) For periodic or semi-persistent CSI, the simulated beam indication is performed semi-statically through RRC signaling by appending additional information to the CodebookConfig IE, and (ii) For aperiodic CSI, the simulated beam indication is performed dynamically using additional code points in DCI 0_1. For cases 3a and 3b, the value R will be indicated in the CSI report configuration information element (CSI-ReportConfig IE); (4) The UE derives the PMI on the R simulated beams based on the R CSI-RS measurements. PMI measurement on each simulated beam is performed using one CSI-RS resource; (5) For reporting, the UE downsamples the measured PMI and generates a report combining all R CSI-RS measurements; (6) The UE performs CQI measurement based on the reported PMI; (7) The UE reports PMI and CQI; and (8) Wideband / subband measurements and reporting can be performed as an additional dimension according to the current specification.

[0101] Fig.10 1000 is a signaling flow for CSI measurement and reporting according to an embodiment of the present disclosure. Figure 1 111-116) and BS (e.g., as shown Figure 1 101-103) shown execute signaling flow 1000. Fig.10 The embodiment of the signaling flow 1000 shown in FIG. 1 is for illustration only. Fig.10 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described.

[0102] like Fig.10 As shown, in step 1002, the network (e.g., Figure 1 BS 101-103 shown) to UE (e.g., Figure 1 In step 1004, the network sends a simulated beam codebook indication RRC or DCI 0_1 to the UE. In step 1006, the network sends a CSI-RS to the UE. In step 1008, the UE sends a CSI report to the network.

[0103] In the present disclosure, an analog beam codebook indication is provided. The network uses the CodebookConfig IE to configure the parameter N 3 、N 4 , O 3 and O 4 Indicates the simulated beam codebook to the UE. 3 and N 4 The value of is configured by n3-n4 in CodebookConfig IE, and (N 3 ,N 4 ) Each value in the tuple corresponds to (O 3 ,O 4 ), one or more values ​​of (O 3 ,O 4 ) is configured by parameters o3 and o4 in CodebookConfigIE. In some network implementations, N 3 and N 4 Corresponding to the number of phase-adjustable elements in the first and second dimensions constituting each sub-array.

[0104] In the present disclosure, a simulation beam codebook construction performed by a UE is provided. Based on CodebookConfigIE (i.e., N 3 、N 4 , O 3 and O 4 ), the UE constructs the analog beam codebook as described herein.

[0105] R orthogonal beams are selected, each of which corresponds to a CSI-RS resource.

[0106] In the present disclosure, analog beam indication through RRC signaling is provided. For periodic or semi-persistent CSI, the indication of R orthogonal analog beams is performed semi-statically. The analog beam is given by: Here, in the CodebookConfig IE, the fields AngeBeamOffset0 and AngeBeamOffset1 are used to configure the common offset i 3,2 ∈{0,…,O 3 -1} and i 3,3 ∈{0,…,O 4 -1}, and By index Communicate and use the field analogBeamSubset in the CodebookConfig IE for configuration.

[0107] In the present disclosure, analog beam indication through DCI 0_1 is provided. For aperiodic CSI, the analog beam is indicated by the analog beam indicator field in DCI 0_1. The candidate beam group is signaled through the optional field n3-n4-analogBeamList, which consists of The code point in DCI is used to indicate a specific Yes. Then use the configured offset i 3,2 (analogBeamOffset0) and i 3,3 (analogBeamOffset1) to determine the specific analog beam.

[0108] As an example The list of candidates can be (0,0), (1,0), (0,1), (1,1), from which a specific selection can be indicated using a 2-bit code point in DCI0_1.

[0109] In the present disclosure, an example of analog beam candidate indication using n3-n4-analogBeamList in CodebookConfig IE is provided.

[0110] The UE may expect CSI-RS in the same downlink time slot indicated by DCI 0_1, and the CSI-RS is beamformed according to the indicated simulated beam index. The UE CSI report is generated using aperiodic CSI-RS.

[0111] In the present disclosure, multiple CSI-RS resources in each CSI report are provided. The UE constructs each CSI report by processing CSI-RS measurements, where CSI-RS is received on R CSI-RS resources. Therefore, the CSI-ReportConfig IE is enhanced to include multiple CSI-ResourceConfig IEs for channel measurement, as shown in Table 1.

[0112] Table 1 CSI-ResourceConfig IE for channel measurement

[0113]

[0114] In the present disclosure, UE measurement of PMI on one simulated beam per CSI-RS resource is provided. T =N A N D The baseband equivalent digital channel on each antenna is In a given simulated beam In the case of N D The valid digital channels on a digital port are:

[0115] The UE uses one CSI-RS resource to measure the effective digital channel of each analog beam a Based on the R CSI-RS resources The UE constructs a channel estimate

[0116] In the present disclosure, digital beam selection from measurements on R configured CSI-RS resources is provided. The value L of the total number of digital beams that the UE can report based on CSI measurements on R CSI-RS resources is indicated to the UE via the numberOfDigitalBeams field in the CodebookConfig IE. Therefore, when measuring the channel of each CSI-RS resource, the UE considers N 1 N 2 The UE performs such CSI measurements on R CSI-RS resources. The UE then obtains the RN 1 N 2 Select L digital beams from the digital beams, for which candidate combinations are available. The number of beams selected on different CSI-RS resources can be different, and they are denoted as L r . Limit the selection of L according to the high-level configuration value of L r .

[0117] In this disclosure, downsampling and PMI reporting are provided. r is the simulated beam corresponding to CSI-RS resource r∈{0,…,R-1}. Based on the estimated channel, the UE will correspond to the simulated beam a r The optimal digital precoder for is approximated as a digital beam d of the following form p,r A linear combination of: Among them, L r ≤N 1 N 2 is the number of digital beams selected by the UE for each polarization, corresponding to CSI-RS resource r (i.e., analog beam a r ), and the superscripts 0 and 1 correspond to two different polarizations.

[0118] Since the same analog precoder a is used for all subarrays r of the CSI-RS resource r , so the entire precoder corresponding to CSI-RS resource r is given by:

[0119] The set of hybrid beams selected on the CSI-RS resource is

[0120] The set of selected digital beams for each polarization is: where v p,m is defined as and

[0121] UE can use the index The selected subset of hybrid analog-digital beams is reported by exhaustive signaling. Index i 4,1 Used to transfer index And the offset i 4,2,r ∈{0,…,O 1 -1} and i 4,3,r ∈{0,…,O 2 -1} is transmitted independently for each simulated beam. Fig.11 As shown, by index i 4,2,r and i 4,3,r Determine the final beam.

[0122] Fig.11 An example 1100 of a digital beam corresponding to each CSI-RS resource according to an embodiment of the present disclosure is shown. Fig.11 The illustrated embodiment of digital beams for each CSI-RS resource 1100 is for illustration only.

[0123] like Fig.11 As shown, the digital beam corresponding to each CSI-RS resource has the same offset ((i 4,2,0 ,i 4,3,0 )=(1,1) and (i 4,2,1 ,i 4,3,1 )=(2,0)), therefore, the selected digital beams corresponding to a given CSI-RS resource are orthogonal; however, the offsets of CSI-RS resource 0 and CSI-RS resource 1 are different (i.e., (i 4,2,0 ,i 4,3,0 )≠(i 4,2,1 ,i 4,3,1 )), therefore, the digital beam corresponding to CSI-RS resource 0 is not orthogonal to the digital beam corresponding to CSI-RS resource 1.

[0124] Even though the selected digital beams for different analog beams (CSI-RS resources) do not need to be orthogonal, the corresponding hybrid beams are still orthogonal because whenever a r′ with ar When orthogonal,

[0125] UE can use i 2,2 ∈{0,1,…,2L-1} to report The index of the strongest coefficient in , so that it can be used as a reference.

[0126] UE can use the index Reports the magnitude of the other 2L-1 selected coefficients relative to the strongest coefficient, where B amp is the number of bits used to report each amplitude coefficient. The UE can use the index to report the phase of the coefficient, where B ph is the number of bits used to report each phase coefficient.

[0127] Fig.12 An example of a subset of L digital beam selections per polarization on R CSI-RS resources 1200 according to an embodiment of the present disclosure is shown. Fig.12 The illustrated embodiment of a subset of L digital beam selections per polarization on the R CSI-RS resources 1200 is for illustration only.

[0128] Fig.12 The selection of a subset of L digital beams per polarization on the R CSI-RS resources is shown.

[0129] The various indices used for the combined downsampled PMI reporting are summarized in Table 2.

[0130] Table 2. Combined downsampled PMI

[0131]

[0132] In the present disclosure, UE measurement of CQI is provided. For CQI measurement, the UE may assume that the BS uses the precoder indicated by the UE, and the UE may measure CQI on all R CSI-RS resources.

[0133] For CSI-RS resource r, assume that the network uses precoder B r In some embodiments, the UE may also assume that the network applies a simulated BF associated with the CSI-RS resource r.

[0134] In some embodiments, the CQIs corresponding to R CSI-RS resources (transmitted on R simulated beams) are combined into a single CQI index. In order to combine multiple CQI indices into a single index, multiple methods can be considered. In one method, the UE can linearly average the CQI indices of different simulated beams and round down to the nearest integer corresponding to the CQI value. In another method, SINR averaging is performed on multiple CSI-RS resources and the averaged SINR is mapped to a CQI value.

[0135] The CQI table to be used is configured by the parameter cqi-Table in the CSI-ReportConfig IE. Based on these embodiments, an example CodebookConfig IE and an example AnalogBeamID IE are constructed. Table 3 shows the codebook configuration.

[0136]

[0137]

[0138] Table 4 shows the simulated beam IDs.

[0139] Table 4. Simulated beam IDs

[0140]

[0141] In the present disclosure, analog beam indication via DCI 0_1 is provided. For aperiodic CSI, the analog beam is indicated by the analog beam indicator field in DCI 0_1. As an alternative to the main embodiment, the set of candidate beams is signaled via the optional field 3-o4-analogBeamOffsetList, which is represented by (i 3,2 ,i 3,3 ) is composed of a list of candidate values. The code point in the DCI is used to indicate a specific (i 3,2 ,i 3,3 ) is correct. Then, the analogBeamSubset parameter in CodebookConfigIE is used to determine a set of R orthogonal analog beams.

[0142] As an example, (0,0), (1,0), (0,1), (1,1) can be (i 3,2 ,i 3,3 ) list of candidates, from which a specific selection can be indicated using a 2-bit codepoint in DCI 0_1.

[0143] The UE may expect CSI-RS in the same downlink slot indicated by DCI 0_1, and the CSI-RS is beamformed according to the indicated simulated beam index. The UE CSI report is generated using aperiodic CSI-RS.

[0144] An example CodebookConfig IE based on this embodiment is given in the examples of this disclosure. Table 5 shows the codebook configuration.

[0145] Table 5. Codebook configuration

[0146]

[0147] In this disclosure, CQI reporting of UE is provided. UE can report one CQI index per CSI-RS resource (i.e., simulated beam). The CQI table to be used is configured by the parameter cqi-Table in CSI-ReportConfigIE. For CSI-RS resource r, assume that the network uses precoder B r To calculate CQI.

[0148] For eXtreme MIMO (X-MIMO) base station deployments with more than 1000 antenna elements at the BS, the present disclosure helps UEs report CSI with relatively low signaling overhead under the framework of hybrid (digital / analog) beamforming.

[0149] Fig.13 1 shows a flow chart of a method 1300 for a UE according to an embodiment of the present disclosure. The method 1300 may be executed by a UE (eg, Figure 1 111-116 shown). Fig.13 The illustrated embodiment of method 1300 is for illustration only. Fig.13 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described.

[0150] like Fig.13 As shown, method 1300 starts at step 1302. At step 1302, the UE receives information about (i) a simulated beam and (ii) R CSI-RS resources.

[0151] In step 1304, the UE constructs an analog beam codebook based on the information about the analog beam.

[0152] In step 1306, the UE derives R precoding matrix indicator (PMI) sets corresponding to multiple simulated beams based on the simulated beam codebook and the measurement of the R CSI-RS resources, where each of the R PMI sets corresponds to one simulated beam among the multiple simulated beams associated with the R CSI-RS resources.

[0153] In step 1308, the UE identifies a set of digital beams corresponding to each analog beam based on the channel estimation operation.

[0154] In step 1310, the UE identifies a hybrid beam set corresponding to each of R CSI-RS resources, wherein the hybrid beam sets include a digital beam set and an analog beam, respectively.

[0155] In step 1312, the UE uses the index to identify a subset of the hybrid beam set to generate PMIs corresponding to the multiple simulated beams.

[0156] In step 1314, the UE sends a CSI report including (i) the PMI and (ii) a subset of the hybrid beam sets.

[0157] In one embodiment, the information for simulating the beam is received through an RRC signal. In such an embodiment, the information for simulating the beam corresponds to a periodic or semi-persistent CSU, and the RRC signal includes a CodebookConfig IE.

[0158] In one embodiment, the information of the analog beam is received via DCI. In such an embodiment, the information of the analog beam corresponds to aperiodic.

[0159] In such an embodiment, the DCI includes a pair of indices for the aperiodic CSI, and the pair of indices corresponds to the analog beams.

[0160] In one embodiment, the UE receives a CSI-ReportConfig IE including a value of R.

[0161] In one embodiment, a group of CQIs corresponding to R CSI-RS resources are combined into a single CQI index, and the single CQI index includes multiple CQI indexes.

[0162] In one embodiment, the UE linearly averages each of the multiple CQI indexes of different simulated beams and rounds each of the multiple linearly averaged CQI indexes to the nearest integer corresponding to the value of the CQI; or averages the signal-to-interference-and-noise ratio (SINR) on multiple CSI-RS resources and maps the averaged SINR to the value of the CQI.

[0163] The above flowcharts illustrate example methods that can be implemented according to the principles of the present disclosure, and various changes can be made to the methods shown in the flowcharts herein. For example, although shown as a series of steps, the individual steps in each figure can overlap, occur in parallel, occur in a different order, or occur multiple times. In another example, steps can be omitted or replaced with other steps.

[0164] Fig.14 is a block diagram showing the structure of a UE according to an embodiment of the present disclosure.

[0165] like Fig.14 As shown, the UE according to the embodiment may include a transceiver 1410, a memory 1420, and a processor 1430. The transceiver 1410, the memory 1420, and the processor 1430 of the UE may operate according to the communication method of the above-mentioned UE. However, the components of the UE are not limited thereto. For example, the UE may include more or less components than those described above. In addition, the processor 1430, the transceiver 1410, and the memory 1420 may be implemented as a single chip. In addition, the processor 1430 may include at least one processor. In addition, Fig.14 The UE corresponds to Figure 1 and Fig.10 UE.

[0166] The transceiver 1410 collectively refers to a UE receiver and a UE transmitter, and can send / receive signals to / from a base station or a network entity. The signals sent to or received from a base station or a network entity may include control information and data. The transceiver 1410 may include an RF transmitter for up-converting and amplifying the transmit signal, and an RF receiver for low-noise amplification and down-converting the receive signal. However, this is merely an example of the transceiver 1410, and the components of the transceiver 1410 are not limited to the RF transmitter and the RF receiver.

[0167] Also, the transceiver 1410 may receive and output signals to the processor 1430 through a wireless channel, and transmit signals output from the processor 1430 through a wireless channel.

[0168] The memory 1420 may store programs and data required for the operation of the UE. In addition, the memory 1420 may store control information or data included in a signal obtained by the UE. The memory 1420 may be a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM and a DVD, or a combination of storage media.

[0169] The processor 1430 may control a series of processes so that the UE operates as described above. For example, the transceiver 1410 may receive a data signal including a control signal sent by a base station or a network entity, and the processor 1430 may determine a result of receiving the control signal and the data signal sent by the base station or the network entity.

[0170] Fig.15 is a block diagram showing the structure of a base station according to an embodiment of the present disclosure.

[0171] like Fig.15 As shown, the base station according to the embodiment may include a transceiver 1510, a memory 1520, and a processor 1530. The transceiver 1510, the memory 1520, and the processor 1530 of the base station may operate according to the communication method of the above-mentioned base station. However, the components of the base station are not limited thereto. For example, the base station may include more or fewer components than those described above. In addition, the processor 1530, the transceiver 1510, and the memory 1520 may be implemented as a single chip. In addition, the processor 1530 may include at least one processor. In addition, Fig.15 The base station corresponds to Figure 1 BS.

[0172] The transceiver 1510 collectively refers to a base station receiver and a base station transmitter, and can send / receive signals to / from a terminal (UE) or a network entity. The signals sent to or received from the terminal or network entity may include control information and data. The transceiver 1510 may include an RF transmitter for up-converting and amplifying the transmitted signal, and an RF receiver for low-noise amplification and down-converting the received signal. However, this is merely an example of the transceiver 1510, and the components of the transceiver 1510 are not limited to the RF transmitter and the RF receiver.

[0173] In addition, the transceiver 1510 may receive and output signals to the processor 1530 through a wireless channel, and transmit signals output from the processor 1530 through a wireless channel.

[0174] The memory 1520 may store programs and data required for the base station operation. In addition, the memory 1520 may store control information or data included in a signal obtained by the base station. The memory 1520 may be a storage medium such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM and a DVD, or a combination of storage media.

[0175] The processor 1530 may control a series of processes so that the base station operates as described above. For example, the transceiver 1510 may receive a data signal including a control signal transmitted by a terminal, and the processor 1530 may determine the result of receiving and transmitting the data signal and the control signal by the terminal.

[0176] The methods according to the embodiments described in the claims or the detailed description of the present disclosure may be implemented in hardware, software or a combination of hardware and software.

[0177] When the electrical structure and method are implemented in software, a computer-readable recording medium having one or more programs (software modules) recorded thereon may be provided. One or more programs recorded on the computer-readable recording medium are configured to be executed by one or more processors in an electronic device. One or more programs include instructions for executing the method according to the embodiments described in the claims or the detailed description of the present disclosure.

[0178] The program (e.g., software module or software) may be stored in a random access memory (RAM), a nonvolatile memory including flash memory, a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic disk storage device, a compact disk ROM (CD-ROM), a digital versatile disk (DVD), another type of optical storage device, or a magnetic tape cassette. Alternatively, the program may be stored in a memory system that includes a combination of some or all of the above memory devices. Furthermore, each memory device may include a plurality of memory devices.

[0179] The program may also be stored in a connectable storage device that may be accessed via a communication network such as the Internet, an intranet, a local area network (LAN), a wireless LAN (WLAN), or a storage area network (SAN), or a combination thereof. The storage device may be connected to a device according to an embodiment of the present disclosure via an external port. Another storage device on the communication network may also be connected to a device that performs an embodiment of the present disclosure.

[0180] In the above-mentioned embodiment of the present disclosure, according to the embodiment, the elements included in the present disclosure are represented in singular or plural form. However, for the convenience of explanation, the singular or plural form is appropriately selected, and the present disclosure is not limited thereto. In this way, the elements represented in plural form can also be configured as a single element, and the elements represented in singular form can also be configured as plural elements.

[0181] Although the drawings show different examples of user equipment, various changes may be made to the drawings. For example, the user equipment may include any number of each component in any suitable arrangement. Generally, the drawings do not limit the scope of the present disclosure to any particular configuration. In addition, although the drawings show operating environments in which various user equipment features disclosed in this patent document may be used, these features may be used in any other suitable system.

[0182] At least some of the exemplary embodiments described herein may be constructed in part or in whole using dedicated special purpose hardware. Terms such as "component", "module" or "unit" used herein may include but are not limited to hardware devices, such as circuits in the form of discrete or integrated components, field programmable gate arrays (FPGAs) or application specific integrated circuits (ASICs), which perform certain tasks or provide associated functions. In some embodiments, the element may be configured to reside on a tangible, persistent, addressable storage medium and may be configured to execute on one or more processors. In some embodiments, these functional elements may include, for example, components (such as software components, object-oriented software components, class components and task components), processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays and variables. Although exemplary embodiments have been described with reference to components, modules and units discussed herein, such functional elements may be combined into fewer elements or separated into additional elements. Various combinations of optional features have been described herein, and it should be understood that the described features may be combined in any suitable combination. In particular, the features of any one exemplary embodiment may be appropriately combined with the features of any other embodiment unless such a combination is mutually exclusive. Throughout the specification, the term “includes” or “comprising” means including specified components but does not exclude the existence of other components.

[0183] Attention is directed to all papers and documents related to the present application filed concurrently with or prior to this specification, and these papers and documents are open to public inspection with this specification, and the contents of all these papers and documents are incorporated herein by reference.

[0184] All features disclosed in this specification (including any accompanying claims, abstract and drawings), and / or all steps of any method or process so disclosed, may be combined in any combination, except combinations in which at least some of such features and / or steps are mutually exclusive.

[0185] Each feature disclosed in this specification (including any accompanying claims, abstracts and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Therefore, unless expressly stated otherwise, each feature disclosed is only an example of a general series of equivalent or similar features.

[0186] The invention is not limited to the details of the foregoing embodiments. The invention extends to any novel one or any novel combination of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one or any novel combination of the steps of any method or process disclosed in this specification (including any accompanying claims, abstract and drawings).

[0187] Any of the above-mentioned variations can be used independently or in combination with at least one other variation. The above-mentioned flow charts show example methods that can be implemented according to the principles of the present disclosure, and various changes can be made to the methods shown in the flow charts herein. For example, although shown as a series of steps, the individual steps in each figure can overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps can be omitted or replaced by other steps.

[0188] Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be suggested by those skilled in the art. The present disclosure is intended to include such changes and modifications that fall within the scope of the appended claims. Any description in this application should not be construed as implying that any particular element, step or function is an essential element that must be included within the scope of the claims. The scope of the subject matter of the patent right is defined by the claims.

[0189] The description of an embodiment with multiple components in communication with each other does not imply that all such components are required. Rather, a variety of optional components are described to illustrate the various possible embodiments of the present disclosure.

[0190] When a single device or article is described herein, it is apparent that more than one device / article (whether or not they collaborate) may be used to replace a single device / article. Similarly, where more than one device or article (whether or not they collaborate) is described herein, it is apparent that a single device / article may be used to replace more than one device or article, or a different number of devices / articles may be used to replace the number of devices or programs shown. The functions and / or features of a device may optionally be embodied by one or more other devices that are not explicitly described as having such functions / features. Therefore, other embodiments of the present disclosure do not need to include the device itself.

[0191] This specification has described a method and apparatus for selecting a selective security mode, which is used to apply selective security and flow management for a user equipment (UE) under mobility. In addition, this specification describes a method and apparatus for selectively secure flow management during switching. The steps shown are used to explain the embodiments shown, and it should be expected that ongoing technological developments will change the way to perform specific functions. These embodiments are used for illustrative purposes in this article, rather than for restriction. In addition, for the convenience of description, the boundaries of functional components are arbitrarily defined here. As long as the specified functions and their relationships are properly performed, replaceable boundaries can be defined. Based on the teachings contained herein, it will be obvious to those skilled in the relevant art that alternatives (including equivalents, extensions, changes, deviations, etc. of those alternatives described herein) will be obvious. Such alternatives fall within the scope and spirit of the disclosed embodiments. In addition, the words "include", "have", "contain" and "include" and other similar forms are equivalent in meaning and are open, because one or more items after any of these words do not mean to be an exhaustive list of such items, or mean to be limited to one or more items listed. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise.

[0192] Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be suggested by those skilled in the art. The present disclosure is intended to include such changes and modifications that fall within the scope of the appended claims. Any description in this application should not be construed as implying that any particular element, step or function is an essential element that must be included within the scope of the claims. The scope of the subject matter of the patent right is defined by the claims.

Claims

1. A user equipment UE in a wireless communication system, the UE include: at least one transceiver; as well as a controller coupled to the at least one transceiver and configured to: receiving information for (i) a simulated beam and (ii) R channel state information reference signal (CSI-RS) resources, constructing an analog beam codebook based on the information for the analog beam, Based on the simulated beam codebook and the measurement of the R CSI-RS resources, R precoding matrix indicator PMI sets corresponding to multiple simulated beams are obtained, wherein each of the R PMI sets corresponds to one simulated beam among the multiple simulated beams associated with the R CSI-RS resources, identifying, based on a channel estimation operation, a set of digital beams corresponding to each of the plurality of analog beams, identifying a hybrid beam set corresponding to each of the R CSI-RS resources, wherein the hybrid beam set includes the digital beam set and the analog beam, respectively; using an index to identify a subset of the set of hybrid beams to generate PMIs corresponding to the plurality of simulated beams, and A CSI report is sent, wherein the CSI report includes (i) the PMI and (ii) a subset of the hybrid beam set.

2. The UE according to claim 1, in, The information for the simulated beam is received via a radio resource control RRC signal, wherein the information for the simulated beam corresponds to periodic or semi-persistent CSI, and The RRC signal includes a codebook configuration information element CodebookConfigIE.

3. The UE according to claim 1, in, The information for the simulated beam is received via downlink control information DCI, and The information for the simulated beam corresponds to the non-periodic CSI.

4. The UE according to claim 1, in, The controller is further configured to receive a CSI report configuration information element CSI-ReportConfigIE including a value of R.

5. A method performed by a user equipment UE, the method include: receiving information for (i) a simulated beam and (ii) R channel state information reference signal (CSI-RS) resources, constructing an analog beam codebook based on the information for the analog beam, Based on the simulated beam codebook and the measurement of the R CSI-RS resources, R precoding matrix indicator PMI sets corresponding to multiple simulated beams are obtained, wherein each of the R PMI sets corresponds to one simulated beam among the multiple simulated beams associated with the R CSI-RS resources, identifying, based on a channel estimation operation, a set of digital beams corresponding to each of the plurality of analog beams, identifying a hybrid beam set corresponding to each of the R CSI-RS resources, wherein the hybrid beam set includes the digital beam set and the analog beam, respectively; using an index to identify a subset of the set of hybrid beams to generate PMIs corresponding to the plurality of simulated beams, and A CSI report is sent, wherein the CSI report includes (i) the PMI and (ii) a subset of the hybrid beam set.

6. The method according to claim 5, in, The information for the simulated beam is received via a radio resource control RRC signal, wherein the information for the simulated beam corresponds to periodic or semi-persistent CSI, and The RRC signal includes a codebook configuration information element CodebookConfigIE.

7. The method according to claim 5, in, The information for the simulated beam is received via downlink control information DCI, and The information for the simulated beam corresponds to the non-periodic CSI. 8 . The method of claim 5 , further comprising receiving a CSI report configuration information element (CSI-ReportConfig IE) including a value of R.

9. A base station BS, include: at least one transceiver; and a controller coupled to the at least one transceiver and configured to: Sending information for (i) the analog beam and (ii) R channel state information reference signal CSI-RS resources, and receiving a CSI report, the CSI report comprising (i) a precoding matrix indicator (PMI) and (ii) a subset of a hybrid beam set, The simulated beam codebook is constructed based on the information for the simulated beam. The R PMI sets corresponding to the multiple simulated beams are obtained based on the simulated beam codebook and the measurement of the R CSI-RS resources, and each of the R PMI sets corresponds to a simulated beam in the multiple simulated beams associated with the R CSI-RS resources. wherein a set of digital beams corresponding to each of the plurality of analog beams is identified based on a channel estimation operation, wherein a hybrid beam set corresponding to each of the R CSI-RS resources is identified, the hybrid beam set comprising the digital beam set and the analog beam, respectively; and The subset of the hybrid beam set is identified using an index and is used to generate R PMIs corresponding to the multiple simulated beams.

10. The BS according to claim 9, in, The information for the simulated beam is sent via a radio resource control RRC signal, wherein the information for the simulated beam corresponds to periodic or semi-persistent CSI, and The RRC signal includes a codebook configuration information element CodebookConfigIE.

11. The BS according to claim 9, in, The information for the analog beam is sent via downlink control information DCI, and The information for the simulated beam corresponds to the non-periodic CSI.

12. The BS according to claim 9, in, The controller is further configured to send a CSI report configuration information element CSI-ReportConfigIE including a value of R.

13. A method performed by a base station BS, the method include: Sending information for (i) the analog beam and (ii) R channel state information reference signal CSI-RS resources, and receiving a CSI report, the CSI report comprising (i) a precoding matrix indicator (PMI) and (ii) a subset of a hybrid beam set, The simulated beam codebook is constructed based on the information for the simulated beam. The R PMI sets corresponding to the multiple simulated beams are obtained based on the simulated beam codebook and the measurement of the R CSI-RS resources, and each of the R PMI sets corresponds to a simulated beam in the multiple simulated beams associated with the R CSI-RS resources. wherein a set of digital beams corresponding to each of the plurality of analog beams is identified based on a channel estimation operation, wherein a hybrid beam set corresponding to each of the R CSI-RS resources is identified, the hybrid beam set comprising the digital beam set and the analog beam, respectively; and The subset of the hybrid beam set is identified using an index and is used to generate R PMIs corresponding to the multiple simulated beams.

14. The method according to claim 13, in, The information for the simulated beam is sent via a radio resource control RRC signal, wherein the information for the simulated beam corresponds to periodic or semi-persistent CSI, and The RRC signal includes a codebook configuration information element CodebookConfigIE.

15. The method according to claim 13, in, The information for the analog beam is sent via downlink control information DCI, and The information for the simulated beam corresponds to the non-periodic CSI.

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