Fine frequency domain channel state information for large bandwidth

Abstract

Certain aspects of the present disclosure provide techniques for fine frequency domain (FD) channel state information (CSI) for large bandwidth. An example method performed at a user equipment (UE) generally includes receiving, from a network entity, signaling to configure the UE for CSI reporting based on a plurality of spatial domain (SD) bases and a subband size; selecting the plurality of SD bases from a set of candidate SD bases based on CSI reference signal (CSI-RS) measurements; calculating, for at least some of the plurality of SD bases, an FD phase rotation parameter specific to each of the plurality of SD bases based on an FD phase rotation unit less than the sub-band size; and transmitting a CSI comprising an indication of the plurality of SD bases and the FD phase rotation parameter to the network entity.

Description

Technical Field

[0001] Various aspects of this disclosure relate to wireless communications, and more specifically, to techniques for reporting fine frequency domain (FD) channel state information (CSI) for large bandwidths. Background Technology

[0002] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, broadcasting, or other similar services. These wireless communication systems may employ multiple access technologies that enable communication with multiple users by sharing available wireless communication system resources.

[0003] Despite significant technological advancements in wireless communication systems over the years, challenges remain. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and receivers. Therefore, there is a continuous desire to improve the technical performance of wireless communication systems, including, for example: improving communication speed and data carrying capacity; improving the efficiency of shared communication media; reducing the power consumed by transmitters and receivers during communication; improving the reliability of wireless communication; avoiding redundant transmission and / or reception and related processing; improving the coverage area of ​​wireless communication; increasing the number and types of devices that can access the wireless communication system; increasing the ability of different types of devices to communicate with each other; and increasing the number and types of available wireless communication media. Therefore, there is a need for further improvements to wireless communication systems to overcome the aforementioned technical challenges and other obstacles. Summary of the Invention

[0004] One aspect provides a method for wireless communication at a user equipment (UE). The method includes: receiving from a network entity signaling to configure the UE for channel state information (CSI) reporting based on a plurality of spatial domain (SD) bases and subband sizes; selecting the plurality of SD bases from a set of candidate SD bases based on CSI reference signal (CSI-RS) measurements; calculating FD phase rotation parameters specific to each of the plurality of SD bases for at least some of the SD bases based on frequency domain (FD) phase rotation units smaller than the subband size; and transmitting to the network entity a CSI including an indication of the plurality of SD bases and the FD phase rotation parameters.

[0005] On the other hand, a method for wireless communication at a network entity is provided. The method includes: transmitting signaling to a user equipment (UE) to configure the UE for Channel State Information (CSI) reporting based on a plurality of spatial domain (SD) bases and subband sizes; transmitting a CSI reference signal (CSI-RS) on resources associated with a set of candidate SD bases; receiving a CSI from the UE, the CSI including indications of the plurality of SD bases and FD phase rotation parameters specific to each of the plurality of SD bases based on a frequency domain (FD) phase rotation unit smaller than the subband size for at least some of the plurality of SD bases; and transmitting a PDSCH to the UE using pre-decoding based on the received CSI.

[0006] Other aspects provide: an apparatus capable of operating to, being configured to, or otherwise adapted to perform one or more of the foregoing methods and / or those methods described elsewhere herein; a non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of the apparatus, cause the apparatus to perform the foregoing methods and those methods described elsewhere herein; a computer program product embodied on a computer-readable storage medium comprising: code for performing the foregoing methods and those methods described elsewhere herein; and / or an apparatus comprising components for performing the foregoing methods and those methods described elsewhere herein. By way of example, an apparatus may include a processing system, a device having a processing system, or a processing system cooperating via one or more networks.

[0007] For illustrative purposes, the following description and figures illustrate certain features. Attached Figure Description

[0008] The accompanying drawings depict certain features of the various aspects described herein and should not be considered as limiting the scope of this disclosure.

[0009] Figure 1 An example wireless communication network is depicted.

[0010] Figure 2 An example decomposed base station architecture is described.

[0011] Figure 3 Various aspects of the example base station and example user equipment are described.

[0012] Figure 4A , Figure 4B , Figure 4C and Figure 4D Various example aspects of data structures used in wireless communication networks are described.

[0013] Figure 5 Example frequency range and mid-frequency band are depicted.

[0014] Figure 6A An example predecoder matrix is ​​depicted.

[0015] Figure 6B An example of enhanced Type II (eType-II) Channel State Information (CSI) is depicted.

[0016] Figure 7 An example of CSI being transmitted in multiple parts is depicted.

[0017] Figure 8 A call flowchart illustrating example communication between a UE and a network entity according to certain aspects of this disclosure is depicted.

[0018] Figure 9 An example diagram illustrating an example sub-band and a frequency rotation unit according to certain aspects of this disclosure is depicted.

[0019] Figure 10 Example tables illustrating aspects of CSI, including frequency domain (FD) phase rotation parameters, according to certain aspects of this disclosure are depicted.

[0020] Figure 11 A method for wireless communication is described.

[0021] Figure 12 A method for wireless communication is described.

[0022] Figure 13 Various aspects of the example communication device are described. Detailed Implementation

[0023] This disclosure provides apparatus, methods, processing systems, and computer-readable media for reporting fine frequency domain (FD) channel state information (CSI) for large bandwidth applications.

[0024] Channel State Information (CSI) indicates the channel characteristics of a communication link as observed by wireless devices such as User Equipment (UE). CSI represents, for example, the combined effects of scattering, fading, and power attenuation with distance between transmitter and receiver. Channel estimation can be performed using pilot signals (such as CSI Reference Signals (CSI-RS)) to determine these effects on the channel. CSI can be reported by the UE and used by network entities to adapt transmissions based on the current channel conditions, which is useful for achieving reliable communication, especially in multi-antenna systems with high data rates.

[0025] CSI can include various parameters or metrics, such as Channel Quality Indicator (CQI), Pre-decoding Matrix Indicator (PMI), CSI Reference Signal (RS) Resource Indicator (CRI), and Rank Indicator (RI). CSI may also include information associated with frequency domain (FD) bases and spatial domain (SD) beam selection (i.e., a subset of SD bases (beams) out of the total number of SD bases). The total number of SD bases can be based on the number of antennas in the horizontal and vertical directions of the panel. The values ​​of the subsets of SD bases can be determined based on combination coefficients in a standard definition table.

[0026] In some systems with base stations and numerous transmit antennas, CSI-RS can be transmitted via a large number of ports (e.g., more than 32 ports), particularly for higher frequency ranges. Each port can be used to transmit CSI-RS resources corresponding to the configured subband size (up to a certain number of subbands). The antenna configuration (array) can be defined by parameters N1 and N2, where N1 typically refers to the size (number of elements) in the azimuth dimension, and N2 typically refers to the size in the elevation dimension. Assuming a dipole antenna (two polarities), the total number of CSI ports can therefore be 2 × N1 × N2. Parameter N3 typically corresponds to the number of frequency elements (e.g., subbands, resource blocks (RBs), etc.) reported in the CSI report.

[0027] Subband size typically increases with bandwidth to prevent the subband size (N3) from becoming too large and to limit UE processing complexity (CSI must be measured and reported for each subband). However, a large subband size can lead to frequency selectivity within the subband, which may not be captured in the subband's CSI. While a smaller subband size can help avoid frequency selectivity by allowing for finer-grained CSI reporting, it will increase N3 accordingly with a corresponding increase in UE complexity (e.g., assuming singular value decomposition (SVD) per subband).

[0028] However, aspects of this disclosure provide techniques that allow the removal of frequency selectivity (e.g., based on channel measurements) prior to SVD. Using the techniques proposed herein, for example by allowing a single SVD based on flat bandwidth, it may not be necessary to constrain UE complexity with arbitrarily finer frequency granularity.

[0029] This disclosure provides techniques for fine-grained frequency-domain (FD) channel state information (CSI) over large bandwidths. For example, in some aspects, the UE can select multiple SD bases from a set of candidate SD bases based on CSI-RS measurements, calculate FD phase rotation parameters based on FD phase rotation units smaller than the subband size, and transmit CSI including indications of the multiple SD bases and the FD phase rotation parameters. FD phase rotation parameters with finer granularity than the corresponding subband allow the network to substantially consider frequency selectivity within the subband without the additional complexity and overhead that would lead to an increase in N3. Introduction to wireless communication networks

[0030] The techniques and methods described herein can be used in a variety of wireless communication networks. While aspects may be described herein using terms commonly associated with 3G, 4G, and / or 5G wireless technologies, aspects of this disclosure are equally applicable to other communication systems and standards not explicitly mentioned herein.

[0031] Figure 1 An example of a wireless communication network 100 in which the aspects described herein can be implemented is depicted.

[0032] Generally, wireless communication network 100 includes various network entities (optionally, network elements or network nodes). Network entities are typically communication devices and / or communication functions performed by communication devices (e.g., user equipment (UE), base station (BS), components of the BS, servers, etc.). For example, various functions of the network and various devices associated with and interacting with the network can be considered network entities. Furthermore, wireless communication network 100 includes terrestrial aspects, such as terrestrial network entities (e.g., BS 102), and non-terrestrial aspects, such as satellite 140 and aircraft 145, which may include onboard network entities (e.g., one or more BSs) capable of communicating with other network elements (e.g., terrestrial BSs) and user equipment.

[0033] In the depicted example, wireless communication network 100 includes BS 102, UE 104 and one or more core networks (such as Evolved Packet Core (EPC) 160 and 5G Core (5GC) network 190) that interoperate to provide communication services over various communication links, including wired and wireless links.

[0034] Figure 1Various example UEs 104 are described, which may more generally include: cellular phones, smartphones, Session Initiation Protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players, cameras, game consoles, tablet computers, smart devices, wearable devices, vehicles, electricity meters, air pumps, large or small kitchen appliances, healthcare devices, implants, sensors / actuators, displays, Internet of Things (IoT) devices, always-on (AON) devices, edge processing devices, or other similar devices. UE 104 may also be more generally referred to as mobile devices, wireless devices, wireless communication devices, stations, mobile stations, subscriber stations, mobile subscriber stations, mobile units, subscriber units, wireless units, remote units, remote devices, access terminals, mobile terminals, wireless terminals, remote terminals, mobile phones, and others.

[0035] BS 102 communicates wirelessly with UE 104 via communication link 120 (e.g., transmitting or receiving signals to or from UE 104). Communication link 120 between BS 102 and UE 104 may include uplink (UL) (also known as reverse link) transmission from UE 104 to BS 102 and / or downlink (DL) (also known as forward link) transmission from BS 102 to UE 104. In various aspects, communication link 120 may utilize multiple-input multiple-output (MIMO) antenna techniques, including spatial multiplexing, beamforming, and / or transmit diversity.

[0036] BS 102 may typically include: NodeB, enhanced NodeB (eNB), next-generation enhanced NodeB (ng-eNB), next-generation NodeB (gNB or gNodeB), access point, transceiver base station, radio base station, radio transceiver, transceiver functionality, transmit / receive point, and / or others. Each BS in BS 102 may provide communication coverage for a corresponding geographic coverage area 110, which may sometimes be referred to as a cell, and in some cases may overlap (e.g., a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of a macro cell). For example, BS may provide communication coverage for macro cells (covering a relatively large geographic area), pico cells (covering a relatively small geographic area, such as a stadium), femtocells (covering a relatively small geographic area (e.g., a home)), and / or other types of cells.

[0037] Although BS 102 is described as a single communication device in various aspects, it can be implemented in a variety of configurations. For example, to give a few examples, one or more components of the base station can be decomposed, including a central unit (CU), one or more distributed units (DU), one or more radio units (RU), a near real-time (near RT) RAN intelligent controller (RIC), or a non-real-time (non-RT) RIC. In another example, various aspects of the base station can be virtualized. More generally, a base station (e.g., BS 102) can include components located at a single physical location or components located at various physical locations. In examples where the base station includes components located at various physical locations, the various components can each perform functions, such that the various components collectively achieve functionality similar to a base station located at a single physical location. In some aspects, a base station including components located at various physical locations can be referred to as a decomposed radio access network architecture (such as an open RAN (O-RAN) or virtualized RAN (VRAN) architecture). Figure 2 An example decomposed base station architecture is depicted and described.

[0038] Different BSs 102 within the wireless communication network 100 can also be configured to support different radio access technologies (such as 3G, 4G, and / or 5G). For example, a BS 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with EPC 160 via a first backhaul link 132 (e.g., S1 interface). A BS 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN)) can interface with 5GC 190 via a second backhaul link 184. BSs 102 can communicate directly or indirectly with each other (e.g., via EPC 160 or 5GC 190) via a third backhaul link 134 (e.g., X2 interface), which can be wired or wireless.

[0039] Wireless communication network 100 can subdivide the electromagnetic spectrum into various categories, bands, channels, or other characteristics. In some aspects, subdivision is provided based on wavelength and frequency, where frequency may also be referred to as carrier, subcarrier, channel, tone, or subband. For example, 3GPP currently defines frequency range 1 (FR1) as including 410MHz to 7125MHz, which is often (interchangeably) referred to as “sub-6GHz”. Similarly, 3GPP currently defines frequency range 2 (FR2) as including 24,250MHz to 71,000MHz, which is sometimes (interchangeably) referred to as “millimeter wave” (“mmW” or “mmWave”). In some cases, FR2 can be further defined according to subranges (such as a first subrange FR2-1 including 24,250MHz-52,600MHz and a second subrange FR2-2 including 52,600MHz-71,000MHz). Base stations configured to communicate using mmWave / near mmWave radio bands (e.g., mmWave base stations such as BS 180) can utilize beamforming (e.g., 182) with UEs (e.g., 104) to improve path loss and range.

[0040] The communication link 120 between BS 102 and, for example, UE 104 can be via one or more carriers, which may have different bandwidths (e.g., 5MHz, 10MHz, 15MHz, 20MHz, 100MHz, 400MHz and / or other MHz) and may be aggregated in various ways. The carriers may be adjacent to each other or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL compared to UL).

[0041] Compared to lower-frequency communication, communication using higher frequency bands may have higher path loss and shorter distances. Therefore, some base stations (e.g., Figure 1The beamforming 182 of the BS 180 and UE 104 can be used to improve path loss and range. For example, the BS 180 and UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming. In some cases, the BS 180 may transmit beamformed signals to the UE 104 in one or more transmit directions 182'. The UE 104 may receive beamformed signals from the BS 180 in one or more receive directions 182''. The UE 104 may also transmit beamformed signals to the BS 180 in one or more transmit directions 182''. The BS 180 may also receive beamformed signals from the UE 104 in one or more receive directions 182''. The BS 180 and UE 104 may then perform beamforming training to determine the optimal receive and transmit directions for each of the BS 180 and UE 104. It is worth noting that the transmit and receive directions of the BS 180 may or may not be the same. Similarly, the sending and receiving directions of UE 104 can be the same or different.

[0042] The wireless communication network 100 also includes a Wi-Fi AP 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in, for example, unlicensed spectrum in 2.4 GHz and / or 5 GHz.

[0043] Some UEs 104 may use device-to-device (D2D) communication links 158 to communicate with each other. The D2D communication link 158 may use one or more sidelink channels, such as physical sidelink broadcast channel (PSBCH), physical sidelink discovery channel (PSDCH), physical sidelink shared channel (PSSCH), physical sidelink control channel (PSCCH), and / or physical sidelink feedback channel (PSFCH).

[0044] EPC 160 may include various functional components, including: such as the Mobility Management Entity (MME) 162 in the illustrated example, other MMEs 164, Serving Gateway 166, Multimedia Broadcast Multicast Service (MBMS) Gateway 168, Broadcast Multicast Service Center (BM-SC) 170, and / or Packet Data Network (PDN) Gateway 172. MME 162 can communicate with Home Subscriber Server (HSS) 174. MME 162 is the control node that handles signaling between UE 104 and EPC 160. Generally, MME 162 provides bearer and connectivity management.

[0045] Generally, user Internet Protocol (IP) packets are transmitted through Serving Gateway 166, which is itself connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation and other functions. PDN Gateway 172 and BM-SC 170 are connected to IP service 176, which may include, for example, the Internet, intranet, IP Multimedia Subsystem (IMS), packet switching (PS) streaming service, and / or other IP services.

[0046] The BM-SC 170 provides functions for MBMS user service dispatch and delivery. The BM-SC 170 can serve as an entry point for content provider MBMS transmissions, can be used to authorize and initiate MBMS bearer services within a Public Land Mobile Network (PLMN), and / or can be used to schedule MBMS transmissions. The MBMS gateway 168 can be used to distribute MBMS services to BS 102 belonging to a Broadcast-Specific Service Single Frequency Network (MBSFN) area, and / or can be responsible for session management (start / stop) and collecting eMBMS-related billing information.

[0047] 5GC 190 may include various functional components, including: Access and Mobility Management Function (AMF) 192, other AMFs 193, Session Management Function (SMF) 194, and User Plane Function (UPF) 195. AMF 192 can communicate with Unified Data Management (UDM) 196.

[0048] AMF 192 is the control node that handles signaling between UE 104 and 5GC 190. AMF 192 provides services such as Quality of Service (QoS) flow and session management.

[0049] Internet Protocol (IP) packets are transmitted via UPF 195, which connects to IP service 197 and provides the UE with IP address allocation and other functions for 5GC 190. IP service 197 may include, for example, the Internet, intranet, IMS, PS streaming service, and / or other IP services.

[0050] In various aspects, to give a few examples, network entities or network nodes can be implemented as aggregated base stations, decomposed base stations, components of base stations, integrated access and backhaul (IAB) nodes, relay nodes, and sidelink nodes.

[0051] Figure 2An example decomposed base station 200 architecture is depicted. The decomposed base station 200 architecture may include one or more central units (CUs) 210, which may communicate directly with the core network 220 via a backhaul link, or indirectly with the core network 220 through one or more decomposed base station units, such as a near real-time (near-RT) RAN Intelligent Controller (RIC) 225 via an E2 link, or a non-real-time (non-RT) RIC 215 associated with a Service Management and Orchestration (SMO) framework 205, or both. CUs 210 may communicate with one or more distributed units (DUs) 230 via corresponding midhaul links (such as F1 interfaces). DUs 230 may communicate with one or more radio units (RUs) 240 via corresponding fronthaul links. RUs 240 may communicate with a corresponding UE 104 via one or more radio frequency (RF) access links. In some specific implementations, UE 104 may be served simultaneously by multiple RUs 240.

[0052] Each unit in a cell (e.g., CU 210, DU 230, RU 240, and near-RT RIC 225, non-RT RIC 215, and SMO frame 205) may include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the cells, or an associated processor or controller that provides instructions to the cell's communication interface, may be configured to communicate with one or more other cells via the transmission medium. For example, these cells may include a wired interface configured to receive signals or transmit signals to one or more other cells via a wired transmission medium. Additionally or alternatively, a cell may include a wireless interface that may include a receiver, transmitter, or transceiver (such as a radio frequency (RF) transceiver) configured to receive signals on a wireless transmission medium or transmit signals to one or more other cells, or both.

[0053] In some aspects, CU 210 can host one or more higher-level control functions. Such control functions may include Radio Resource Control (RRC), Packet Data Convergence Protocol (PDCP), Serving Data Adaptation Protocol (SDAP), etc. Each control function can be implemented using an interface configured to signal to other control functions hosted by CU 210. CU 210 can be configured to handle user plane functions (e.g., Central Unit-User Plane (CU-UP)), control plane functions (e.g., Central Unit-Control Plane (CU-CP)), or combinations thereof. In some implementations, CU 210 can be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, CU-UP units can communicate bidirectionally with CU-CP units via an interface such as an E1 interface. CU 210 can be implemented to communicate with DU 230 for network control and signaling, as needed.

[0054] DU 230 may correspond to a logical unit comprising one or more base station functions for controlling the operation of one or more RU 240s. In some aspects, DU 230 may host one or more of the Radio Link Control (RLC) layer, the Media Access Control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.), depending at least in part on the functional breakdown, such as those defined by the 3rd Generation Partnership Project (3GPP). In some aspects, DU 230 may also host one or more low PHY layers. Each layer (or module) may be implemented using an interface configured to communicate signaling with other layers (and modules) hosted by DU 230 or with control functions hosted by CU 210.

[0055] Lower-layer functionality can be implemented by one or more RU 240s. In some deployments, the RU240 controlled by the DU 230 may correspond to a logical node that hosts RF processing functions or low-PHY layer functions (such as performing Fast Fourier Transform (FFT), Inverse FFT (iFFT), digital beamforming, Physical Random Access Channel (PRACH) extraction and filtering, or both, at least in part based on functional decomposition (such as lower-layer functional decomposition). In such architectures, the RU 240 may be implemented to handle over-the-air (OTA) communications with one or more UE 104s. In some specific implementations, the real-time and non-real-time aspects of control plane and user plane communications with the RU 240 may be controlled by the corresponding DU 230. In some scenarios, this configuration enables the implementation of the DU 230 and CU 210 in cloud-based RAN architectures (such as vRAN architectures).

[0056] SMO framework 205 can be configured to support RAN deployment and provisioning of both non-virtualized and virtualized network elements. For non-virtualized network elements, SMO framework 205 can be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which can be managed via operation and maintenance interfaces such as the O1 interface. For virtualized network elements, SMO framework 205 can be configured to interact with a cloud computing platform such as Open Cloud (O-Cloud) 290 to perform network element lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface such as the O2 interface. Such virtualized network elements may include, but are not limited to, CU 210, DU 230, RU 240, and near-RT RIC 225. In some implementations, SMO framework 205 can communicate with the hardware aspects of the 4G RAN (such as Open eNB (O-eNB) 211) via the O1 interface. Additionally, in some implementations, SMO framework 205 can communicate directly with one or more RU 240s via the O1 interface. SMO framework 205 may also include a non-RT RIC 215 configured to support the functionality of SMO framework 205.

[0057] The non-RT RIC 215 can be configured to include logical functions that enable non-real-time control and optimization of RAN elements and resources, including AI / ML workflows for model training and updates, or policy-based guidance for applications / features in the near-RT RIC 225. The non-RT RIC 215 can be coupled to or communicate with the near-RT RIC 225 (e.g., via an A1 interface). The near-RT RIC 225 can be configured to include logical functions that enable near real-time control and optimization of RAN elements and resources via data collection and actions through an interface (e.g., via an E2 interface) connecting one or more CU 210s, one or more DU 230s, or both, and O-eNBs to the near-RT RIC 225.

[0058] In some implementations, to generate AI / ML models to be deployed in the near-RT RIC 225, the non-RT RIC 215 may receive parameters or external enrichment information from an external server. This information can be utilized by the near-RT RIC 225 and may be received from non-network data sources or network functions at the SMO framework 205 or the non-RT RIC 215. In some examples, the non-RT RIC 215 or the near-RT RIC 225 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 215 may monitor long-term trends and patterns in performance and employ AI / ML models to perform corrective actions via the SMO framework 205 (such as reconfiguration via O1) or by creating RAN management policies (such as A1 policies).

[0059] Figure 3 Various aspects of examples BS 102 and UE 104 are described.

[0060] Generally, BS 102 includes various processors (e.g., 320, 330, 338, and 340), antennas 334a-334t (collectively referred to as 334), transceivers 332a-332t (collectively referred to as 332) including modulators and demodulators, and other aspects that enable the wireless transmission of data (e.g., data source 312) and the wireless reception of data (e.g., data sink 339). For example, BS 102 can transmit and receive data between BS 102 and UE 104. BS 102 includes a controller / processor 340 that can be configured to implement the various functions described herein related to wireless communication.

[0061] Generally, UE 104 includes various processors (e.g., 358, 364, 366, and 380), antennas 352a-352r (collectively referred to as 352), transceivers 354a-354r (collectively referred to as 354) including modulators and demodulators, and other aspects that enable the wireless transmission of data (e.g., retrieved from data source 362) and the wireless reception of data (e.g., provided to data sink 360). UE 104 includes a controller / processor 380 that can be configured to implement the various functions described herein related to wireless communication.

[0062] Regarding example downlink transmission, BS 102 includes a transmission processor 320 that can receive data from data source 312 and control information from controller / processor 340. The control information may be for a Physical Broadcast Channel (PBCH), Physical Control Format Indicator Channel (PCFICH), Physical HARQ Indicator Channel (PHICH), Physical Downlink Control Channel (PDCCH), Group Shared PDCCH (GC PDCCH), and / or others. In some examples, this data may be for a Physical Downlink Shared Channel (PDSCH).

[0063] The transmitter processor 320 can process (e.g., encode and symbol map) data and control information to obtain data symbols and control symbols, respectively. The transmitter processor 320 can also generate reference symbols (such as those for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS)).

[0064] The transmit (TX) multiple-input multiple-output (MIMO) processor 330 can perform spatial processing (e.g., pre-decoding) on ​​data symbols, control symbols, and / or reference symbols where applicable, and can provide the output symbol stream to the modulators (MODs) in transceivers 332a-332t. Each modulator in transceivers 332a-332t can process its corresponding output symbol stream to obtain an output sample stream. Each modulator can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signal from the modulators in transceivers 332a-332t can be transmitted via antennas 334a-334t respectively.

[0065] To receive downlink transmissions, UE 104 includes antennas 352a-352r that receive downlink signals from BS 102 and provide the received signals to demodulators (DEMODs) in transceivers 354a-354r respectively. Each demodulator in transceivers 354a-354r can adjust (e.g., filter, amplify, down-convert, and digitize) the corresponding received signal to obtain an input sample. Each demodulator can further process the input sample to obtain the received symbols.

[0066] The MIMO detector 356 acquires received symbols from all demodulators in transceivers 354a-354r, performs MIMO detection on the received symbols where applicable, and provides the detected symbols. The receive processor 358 processes (e.g., demodulates, deinterleaves, and decodes) the detected symbols, provides the decoded data for UE 104 to data sink 360, and provides the decoded control information to controller / processor 380.

[0067] Regarding the example uplink transmission, UE 104 further includes a transmission processor 364 that receives and processes data from data source 362 (e.g., for PUSCH) and control information from controller / processor 380 (e.g., for Physical Uplink Control Channel (PUCCH)). Transmission processor 364 can also generate reference symbols for reference signals (e.g., for Sounding Reference Signal (SRS)). Symbols from transmission processor 364 may be pre-decoded by TX MIMO processor 366, where applicable, further processed by modulators in transceivers 354a-354r (e.g., for SC-FDM), and transmitted to BS 102.

[0068] At BS 102, uplink signals from UE 104 can be received by antennas 334a-334t, processed by demodulators in transceivers 332a-332t, detected by MIMO detector 336 where applicable, and further processed by receiver processor 338 to obtain decoded data and control information transmitted by UE 104. Receiver processor 338 can provide the decoded data to data sink 339 and the decoded control information to controller / processor 340.

[0069] Memory 342 and memory 382 can store data and program code for BS 102 and UE 104, respectively.

[0070] Scheduler 344 can schedule UE to transmit data on the downlink and / or uplink.

[0071] In various respects, BS 102 can be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, "transmitting" can refer to various mechanisms that output data, such as from data source 312, scheduler 344, memory 342, transmit processor 320, controller / processor 340, TX MIMO processor 330, transceiver 332a-332t, antenna 334a-334t, and / or other aspects described herein. Similarly, "receiving" can refer to various mechanisms that acquire data, such as from antenna 334a-334t, transceiver 332a-332t, RX MIMO detector 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.

[0072] In various respects, UE 104 can also be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” can refer to various mechanisms that output data, such as from data source 362, memory 382, ​​transmit processor 364, controller / processor 380, TX MIMO processor 366, transceiver 354a-354t, antenna 352a-352t, and / or other aspects described herein. Similarly, “receiving” can refer to various mechanisms that acquire data, such as from antenna 352a-352t, transceiver 354a-354t, RX MIMO detector 356, controller / processor 380, receive processor 358, memory 382, ​​and / or other aspects described herein.

[0073] In some respects, one or more processors may be configured to perform various operations (such as those associated with the methods described herein) and respectively send (output) data to another interface configured to send data or receive (obtain) data from another interface configured to receive data.

[0074] Figure 4A , Figure 4B , Figure 4C and Figure 4D Describes the use of wireless communication networks (such as Figure 1 All aspects of the data structure of the wireless communication network 100.

[0075] Specifically, Figure 4A Figure 400 is an example of the first subframe within a 5G (e.g., 5G NR) frame structure. Figure 4B Figure 430 illustrates an example of a DL channel within a 5G subframe. Figure 4C Figure 450 illustrates an example of the second subframe within a 5G frame structure, and Figure 4D Figure 480 illustrates an example of a UL channel within a 5G subframe.

[0076] Wireless communication systems can utilize Orthogonal Frequency Division Multiplexing (OFDM) with a cyclic prefix (CP) on both the uplink and downlink. Such systems can also support half-duplex operation using Time Division Duplex (TDD). OFDM and Single-Carrier Frequency Division Multiplexing (SC-FDM) will (e.g., as...) Figure 4B and Figure 4D The system bandwidth (as depicted in the text) is divided into multiple orthogonal subcarriers. Each subcarrier can be modulated with data. Modulation symbols can be transmitted in the frequency domain using OFDM and / or in the time domain using SC-FDM.

[0077] Wireless communication frame structures can be frequency division duplex (FDD), where for a specific set of subcarriers, subframes within that set are dedicated to either deep (DL) or ultra-low (UL). Wireless communication frame structures can also be time division duplex (TDD), where for a specific set of subcarriers, subframes within that set are dedicated to both DL and UL.

[0078] exist Figure 4A and Figure 4C In this example, the wireless communication frame structure is TDD, where D stands for DL, U for UL, and X is flexibly used between DL and UL. The UE can configure the time slot format using the received Time Slot Format Indicator (SFI) (dynamically via DL Control Information (DCI) or semi-statically / statically via Radio Resource Control (RRC) signaling). In the depicted example, a 10ms frame is divided into 10 equal-sized 1ms subframes. Each subframe may include one or more time slots. In some examples, each time slot may include 7 or 14 symbols, depending on the time slot format. Subframes may also include micro-slots, which typically have fewer symbols than the entire time slot. Other wireless communication technologies may have different frame structures and / or different channels.

[0079] In some respects, the number of time slots within a subframe is based on the time slot configuration and parameter set. For example, for time slot configuration 0, different parameter sets (μ) 0 to 6 allow 1, 2, 4, 8, 16, 32, and 64 time slots per subframe, respectively. For time slot configuration 1, different parameter sets 0 to 2 allow 2, 4, and 8 time slots per subframe, respectively. Therefore, for time slot configuration 0 and parameter set μ, there are 14 symbols per time slot and 2µ time slots per subframe. The subcarrier spacing and symbol length / duration are functions of the parameter set. The subcarrier spacing can be equal to... kHz, where μ is the parameter set from 0 to 6. Therefore, the parameter set... It has a subcarrier spacing of 15 kHz and a parameter set It has a subcarrier spacing of 960 kHz. The symbol length / duration is negatively correlated with the subcarrier spacing. Figure 4A , Figure 4B , Figure 4C and Figure 4D It provides slot configuration 0 with 14 symbols per slot and parameter set with 4 slots per subframe. Example: The time slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.

[0080] like Figure 4A , Figure 4B , Figure 4C and Figure 4DAs depicted, the resource grid can be used to represent the frame structure. Each time slot includes a resource block (RB) (also known as a physical RB (PRB)) extending for, for example, 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0081] like Figure 4A As illustrated in the example, some REs in the RE carry information for the UE (e.g., Figure 1 and Figure 3 The reference (pilot) signal (RS) for the UE (104) may include a demodulation RS (DMRS) and / or a channel state information reference signal (CSI-RS) for channel estimation at the UE. The RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and / or a phase tracking RS (PT-RS).

[0082] Figure 4B Examples of various DL channels within a subframe of a frame are illustrated. The Physical Downlink Control Channel (PDCCH) carries the DCI within one or more Control Channel Elements (CCEs), each CCE comprising, for example, nine RE groups (REGs), each REG comprising, for example, four consecutive REs in an OFDM symbol.

[0083] The Primary Synchronization Signal (PSS) can be located within symbol 2 of a specific subframe of the frame. The PSS is generated by the UE (e.g., Figure 1 and Figure 3 104) is used to determine subframe / symbol timing and physical layer identifier.

[0084] The secondary synchronization signal (SSS) can be located in symbol 4 of a specific subframe of the frame. The SSS is used by the UE to determine the physical layer cell identifier group number and radio frame timing.

[0085] Based on the Physical Layer Identifier and Physical Layer Cell Identifier Group Number, the UE can determine the Physical Cell Identifier (PCI). Based on the PCI, the UE can determine the location of the aforementioned DMRS. The Physical Broadcast Channel (PBCH), carrying the Master Information Block (MIB), can be logically grouped with the PSS and SSS to form a Synchronization Signal (SS) / PBCH block. The MIB provides the System Frame Number (SFN) and the number of Restricted Frames (RBs) in the system bandwidth. The Physical Downlink Shared Channel (PDSCH) carries user data, broadcast system information (such as System Information Blocks (SIBs)) not transmitted via the PBCH, and / or paging messages.

[0086] like Figure 4CAs illustrated, some REs in the REs carry DMRS for channel estimation at the base station (indicated as R for a particular configuration, but other DMRS configurations are possible). The UE can transmit DMRS for PUCCH and DMRS for PUSCH. PUSCH DMRS can be transmitted, for example, in the first or second symbol before the PUSCH. PUCCH DMRS can be transmitted in different configurations depending on whether a short or long PUCCH is being transmitted and depending on the specific PUCCH format used. UE104 can transmit a Sounding Reference Signal (SRS). SRS can be transmitted, for example, in the last symbol of a subframe. SRS can have a comb structure, and the UE can transmit SRS on one of the comb teeth. SRS can be used by the base station for channel quality estimation to enable frequency-dependent scheduling of the UL.

[0087] Figure 4D Examples of various UL channels within a subframe of a frame are illustrated. The PUCCH can be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicators (CQI), pre-decoding matrix indicators (PMI), rank indicators (RI), and HARQ ACK / NACK feedback. The PUSCH carries data and may additionally be used to carry buffer status reports (BSR), power clearance reports (PHR), and / or UCI. Channel State Information (CSI) Overview

[0088] Channel state information (CSI) typically refers to information indicating the channel characteristics of a communication link. As noted above, CSI can represent, for example, the combined effects of scattering, fading, and power attenuation with the distance between the transmitter and receiver. Channel estimation can be performed using pilot signals (such as CSI reference signals (CSI-RS)) to determine these effects on the channel. CSI can be used to adapt transmission based on the current channel conditions, which is useful for achieving reliable communication, especially in multi-antenna systems with high data rates. CSI is measured, quantized, and fed back to the transmitter at the receiver.

[0089] The time and frequency resources that can be used by the user equipment (UE) to report CSI are controlled by network entities (e.g., base stations such as gNB). CSI may include a Channel Quality Indicator (CQI), a Pre-decoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), and / or an L1 Reference Signal Received Power (RSRP). However, as described below, additional information or other information may be included in the CSI.

[0090] The UE can be configured by the gNB for CSI reporting. For example, the gNB can configure a CSI reporting configuration or multiple CSI reporting configurations for the UE. The CSI reporting configuration can be provided to the UE via higher-layer signaling, such as Radio Resource Control (RRC) signaling (e.g., CSI-ReportConfig). The CSI reporting configuration can be associated with CSI-RS resources used for channel measurements (CM), interference measurements (IM), or both. The CSI reporting configuration is used to configure CSI-RS resources (e.g., CSI-ResourceConfig) for CSI measurements. The CSI-RS resources provide the UE with a configuration of CSI-RS ports or groups of CSI-RS ports mapped to time and frequency resources (e.g., resource elements (REs)). The CSI-RS resources can be zero-power (ZP) or non-zero-power (NZP) resources. At least one NZP CSI-RS resource can be configured for CM.

[0091] CSI reporting configuration allows the UE to be configured for aperiodic, periodic, or semi-persistent CSI reporting. For periodic CSI, the UE can be configured with periodic CSI-RS resources. Periodic CSI on the Physical Uplink Control Channel (PUCCH) can be triggered via RRC. Semi-persistent CSI reporting on the PUCCH can be activated via Media Access Control (MAC) control elements (CE). For aperiodic and semi-persistent CSI on the Physical Uplink Shared Channel (PUSCH), the BS can signal a CSI report trigger to the UE, instructing the UE to transmit CSI reports for one or more CSI-RS resources, or configure CSI-RS report trigger states (e.g., CSI-AperiodicTriggerStateList and CSI-SemiPersistentOnPUSCH-TriggerStateList). CSI report triggering for aperiodic and semi-persistent CSI on the PUSCH can be provided via Downlink Control Information (DCI).

[0092] The UE can report CSI Feedback (CSF) based on CSI reporting configuration and CSI reporting triggering. For example, the UE can measure the channels on which triggered (e.g., associated with CSI reporting configuration) CSI-RS resources are transmitted. Based on these measurements, the UE can select preferred CSI-RS resources. The UE reports the CSF for the selected CSI-RS resources.

[0093] Each CSI reporting configuration can be associated with a single downlink (DL) bandwidth portion (BWP). The CSI reporting setting configuration can define the CSI reporting band as a subset of subbands of the BWP. The associated DLBWP can be indicated by a higher-layer parameter (e.g., bwp-Id) in the CSI reporting configuration for CM and contains parameters for a CSI reporting band, such as codebook configuration, time-domain behavior, frequency granularity for CSI, measurement constraint configuration, and CSI-related quantities to be reported by the UE. Each CSI resource setting can reside within a DL BWP identified by a higher-layer parameter, and all CSI resource settings can be linked to CSI reporting settings with the same DL BWP.

[0094] In some systems, the UE can configure one of two possible subband sizes via higher-layer signaling (e.g., in the CSI report configuration) (e.g., the reportFreqConfiguration included in CSI-ReportConfig), which indicates the frequency granularity of the CSI report, where the subband can be defined as... The adjacent Physical Resource Blocks (PRBs) depend on the total number of PRBs in the BWP. The UE can also receive indications of subbands for which CSI feedback is requested. In some examples, a subband mask is configured for the requested subbands used for CSI reporting. The UE computes a pre-decoder for each requested subband and finds a pre-decoder matrix indicator (PMI) that matches the computed pre-decoder in each of these subbands.

[0095] In 5G New Radio (NR) Massive Multiple-Input Multiple-Output (MIMO), CSI (i.e., Digital Beamforming) supports up to 32 antenna ports. Within the (low-frequency band) frequency range 1 (FR1), only a small number of antenna ports can be used (e.g., due to limitations in antenna array size, such as shape factor). In frequency range 2 (FR2), a small number of antenna ports (e.g., 2 or 4 ports) can also be used to limit antenna hardware costs. In some cases, a small number of antenna ports is used because they function correctly with narrow analog beams implemented using large phased antenna arrays (e.g., with 1024 antenna elements).

[0096] In such Figure 5In some intermediate frequency bands depicted in Figure 500 (e.g., higher FR1 (e.g., 3 GHz to 6 GHz) or frequency range 3 (FR2) (7 GHz to 24 GHz)), the gNB 102 may use active antenna units (AAUs) 510 with a large number of antenna ports. In some cases, the intermediate frequency band may support an even greater number of antenna ports (e.g., more than 32 antenna ports). In the illustrated example, 192 transmitter-receiver units (TXRUs) 512 with 64 or 128 ports of CSI-RS may be supported. In some cases, the intermediate frequency band may be deployed using more than one analog beam for hybrid beamforming (e.g., four or more beams). Channel State Information (CSI) Feedback Coefficient Report Overview

[0097] User equipment (UE) can be configured to perform channel state information (CSI) reporting, for example, by receiving CSI configuration messages from a base station (BS). In some cases, the UE can be configured to report at least the Type II pre-decoder across configured frequency domain (FD) units. For example, for layer... pre-decoder matrix This includes using spatial compression to report the W1 matrix of a subset of selected beams and using FD cells across configurations to report (for cross-polarization) the linear combination coefficients for selected beams (2L). matrix: ,in , Where b i It is the selected beam, c i It is the set of coefficients of a linear combination (i.e., a matrix). The entries), L is the number of selected spatial beams, and N3 corresponds to the number of frequency units (e.g., subbands, resource blocks (RBs), etc.). In some configurations, L is configured via Radio Resource Control (RRC). The pre-decoder is based on a linear combination of digital Fourier transform (DFT) beams. Type II codebooks improve multi-user (MU) multiple-input multiple-output (MIMO) performance. In some configurations considering the presence of two polarizations, The size of the matrix is ​​2L x N3.

[0098] In some cases, the UE can be configured to report FD compression pre-decoder feedback to reduce CSI reporting overhead. For example... Figure 6A The description is for the layer (in The pre-decoder matrix () FD compression can be used. The matrix is ​​used to convert the pre-decoder matrix. The matrix size is compressed to 2L X M (where M is network configured and conveyed via RRC or downlink control information (DCI) in the CSI configuration message, and M < N3), and is given as: where the precoder matrix (not shown) has P = 2N1N2 rows (spatial domain, number of ports) and N3 columns (frequency domain compression units containing RBs or reporting subbands), and where M bases are independently selected for each of layer 0 and layer 1. Matrix 620 includes linear combination coefficients (amplitude and in-phase), where each element represents the coefficient of a tap for a beam. Matrix 620 is defined by a size of 2L X M, where one row corresponds to one spatial beam in a (not shown) of size P X 2L (where L is network entity configured via RRC), and where one entry represents the coefficient of one tap for that spatial beam. The UE may be configured to report (e.g., CSI report) a subset K0 < 2LM of the linear combination coefficients of matrix 620. For example, the UE may report the K NZ,i <K0 coefficients illustrated as shaded squares (e.g., where K NZ,i corresponds to the maximum number of non-zero coefficients for layer (where or 1), and K0 is network configured via RRC) (e.g., the unreported coefficients are set to zero). In some configurations, the entries in matrix 620 correspond to the rows of matrix 630. In the example shown, both matrix 620 at layer 0 and matrix 620 at layer 1 are 2L X M. Matrix 640 at layer 1 is also 2L X M.

[0099] Matrix 630 consists of basis vectors for performing compression in the FD (e.g., each row is a basis vector). In the example shown, both matrix 630 at layer 0 and matrix 630 at layer 1 and matrix 66 of matrix 660 at layer 1 include M = 4 FD bases (e.g., illustrated as shaded rows) from N3 candidate DFT bases. In some configurations, the UE may report via CSI report a subset of the selected bases of the matrix. Specifically, M bases are selected at layer 0 and layer 1. That is, the M bases selected at layer 0 may be the same / partially overlapping / non-overlapping with the M bases selected at layer 1. Overview of Channel State Feedback (CSF) Based on User Equipment (UE) Pre-decoded Matrix Indicator (PMI) Codebook

[0100] The pre-decoded matrix indicator (PMI) codebook is a dictionary of PMI entries. In this way, using the PMI codebook, each PMI component from a predefined set can be mapped to a bit sequence reported by the user equipment (UE). The base station (BS) that receives the bit sequence (e.g., as channel state feedback (CSF)) can then obtain the corresponding PMI from the reported bit sequence.

[0101] How the UE calculates the PMI is left to the UE's specific implementation. However, how the UE reports the PMI should follow the format defined in the codebook, so that both the UE and the BS know how to map the PMI components to the reported bit sequence.

[0102] Figure 6B Example 670 depicts enhanced Type II (eType-II) Channel State Information (CSI). In this example 670, for each layer, across multiple... The pre-decoder for the (PMI-) subband is matrix: . Among them, the spatial domain (SD) basis (For example, the Direct Fourier Transform (DFT) basis) is matrix, It is shared by all floors. (Number of Tx antennas - of which) and DFT oversampling is configured by Radio Resource Control (RRC), L={2, 4, 6} (e.g., the number of beams) is configured by RRC, and the frequency domain (FD) basis is... (For example, DFT base) is matrix, It is layer-specific, and M (e.g., the number of FD bases) is rank-pair-specific, i.e., for rank = {1, 2}. And for rank = {3, 4}, , or It's configured with RRC. Coefficient matrix. for The matrix is ​​layer-specific. For each layer, the UE can report up to [number missing]. There are non-zero coefficients, among which It's configured with RRC. Across all tiers, the UE can report up to... There are 10 non-zero coefficients, where unreported coefficients can be set to zero. Channel State Information (CSI) Content Overview

[0103] The Channel State Information (CSI) report configuration also allows configuration of the CSI parameters to be reported (sometimes referred to as the number). Codebooks can include Type I single-panel, Type I multi-panel, and Type II single-panel. Regardless of the codebook used, the CSI report can include at least the Channel Quality Indicator (CQI), Pre-decoded Matrix Indicator (PMI), CSI Reference Signal (RS) Resource Indicator (CRI), and Rank Indicator (RI). The structure of the PMI can vary based on the codebook.

[0104] In some cases, due to the large payload size, CSI reports are divided into two parts. For example, CRI, RI, and CQI may be in the first part (part I) of the CSI report, and PMI may be in the second part (part II) of the CSI report.

[0105] For a Type I single-panel codebook, the PMI may include a W1 matrix (e.g., a subset of beams) and a W2 matrix (e.g., phases for cross-polarization combination and beam selection). For a Type I multi-panel codebook, the PMI also includes phases for cross-panel combination, compared to a Type I single-panel codebook. A base station (BS) may have multiple transmit (TX) beams. A user equipment (UE) may feed back the index of one or more preferred beams of a candidate beam to the BS. For example, the UE may feed back the index of the preferred beam for the first... l Layer pre-decoding vector w : in b This represents an oversampled beam with two polarizations (e.g., a Discrete Fourier Transform (DFT) beam), and It is in phase.

[0106] For a Type II codebook (e.g., which may be designed for a single panel), the PMI is a linear combination of beams; it has a subset of orthogonal beams to be used for the linear combination, and has amplitude and phase for each layer and each polarization for each beam. The preferred pre-decoder for a layer may be a combination of beams and associated quantization coefficients, and the UE may feed the selected beams and coefficients back to the BS.

[0107] The UE can report CSI feedback based on CSI reporting configuration and CSI reporting triggering. For example, the UE can measure the channel associated with the CSI of the triggered CSI-RS resource. Based on these measurements, the UE can select a preferred CSI-RS resource. The UE reports CSI feedback for the selected CSI-RS resource. CQI can be calculated based on the reported PMI, RI, and CRI; PMI can be calculated based on the reported RI and CRI; and RI can be calculated based on the reported CRI.

[0108] Figure 7An example of CSI report 700 content is depicted. CSI report 700 can be transmitted in two parts, comprising a first part and a second part. The first part of the CSI report can have a fixed payload size (e.g., it can be smaller than the second part of the CSI report) and is transmitted with higher reliability. The BS is able to determine the larger payload size of the second part of the CSI report based on decoding the first part of the CSI report.

[0109] The first part of the CSI report indicates the amount of RI, CQI, and non-zero coefficients (NZC) (e.g., the total number of NZCs across all layers). RI and NZC can be used to determine the payload size in the second part of the CSI report.

[0110] The second part of the CSI report includes one or more fields to indicate spatial domain (SD) beam selection, frequency domain (FD) basis selection for different layers, strongest coefficient indication (SCI) for different layers, coefficient bitmap selection for different layers, and NZC quantization for different layers. For example, the second part of the CSI report may include a field indicating SD beam selection. This field indicates L SD bases (beams) out of a total of N1N2O1O2 SD bases. N1 and N2 are determined by the number of antennas in the horizontal and vertical directions of the panel. O1 and O2 indicate direct Fourier transform (DFT) oversampling. O1 determines the scan step size in the horizontal direction, and O2 determines the scan step size in the vertical direction. In some cases, the higher O1 and O2 are, the smaller the scan step size of the beam (i.e., the finer the angle).

[0111] In some cases, the standard definition of the combination coefficient table is used for... The combination selection process for L SD bases / beams (e.g., out of a total of N1N2 SD bases) is hard-coded. For example, the value of N1N2 can be up to 16, and the value of L can be up to 6.

[0112] In massive MIMO systems with a large number of antenna ports (e.g., 128 ports), the value of N1N2 may also be higher (e.g., 64). This high value of N1N2 is not supported in the current standard definition table, which specifies a maximum value of 16. Furthermore, in such cases, the selected L SD bases / beams may also need to be larger (e.g., larger than the maximum of 6 supported in the current standard definition table), because each beam may be narrower due to the larger number of antenna ports, and therefore each beam is associated with fewer propagation paths.

[0113] In some cases, updating the current standard definition table to support larger values ​​for N1, N2, and L will make the standard definition table too large. Since the current standard definition table is firmware-based and embedded in the UE's chipset hardware, any increase in the size of the standard definition table will require more memory, resulting in a larger chipset in the UE. Aspects related to fine-grained FD CSI for high bandwidth

[0114] This disclosure provides apparatus, methods, processing systems, and computer-readable media for reporting fine frequency domain (FD) channel state information (CSI) for large bandwidth applications.

[0115] As noted above, in systems with base stations having a large number of transmit antennas, CSI-RS can be transmitted via a large number of ports (e.g., more than 32 ports), especially for higher frequency ranges. For example, systems (such as those with 64 TXRU 512) Figure 5 The System 500 can be deployed in TDD systems operating at 3.5 GHz. Higher frequency ranges (such as FR1 (6425 MHz to 7125 MHz)) enable a larger number of TXRUs, where the same antenna array size can support more antenna elements.

[0116] As noted above, the antenna configuration (array) can be defined by parameters N1 and N2, where the total number of CSI ports (assuming dipole antennas) is 2 × N1 × N2. Network vendors can propose different antenna configurations with different values ​​for N1 and N2 (e.g., N1 = 8, 12, or 16, N2 = 2, 3, or 4), resulting in different total port numbers (e.g., if N1 = 16 and N2 = 4, then the total number of ports = 2 × 16 × 4 = 128). Parameter N3 typically corresponds to the number of frequency units (e.g., sub-bands) reported in the CSI report. Parameter R (configured with higher-level parameters) numberOfPMI-SubbandsPerCQI-Subband This typically indicates the number of PMI subbands per CQI subband. The parameter R can be adjusted based on the configured number of subbands (e.g., in...). csi-ReportingBand (in the middle) to control the total number N3 of the pre-decoding matrices indicated by PMI.

[0117] There are various motivations for supporting CSI with a larger number of CSI ports. For example, TDD may require CSI for multiple component carriers (CCs) only for the downlink (and not the uplink), so it may be difficult to support SRS for all CCs. For example, 700MHz operation at 6GHz may have 7 CCs.

[0118] As noted above, subband size typically increases with bandwidth to prevent the number of subbands (N3) from becoming too large and to limit UE processing complexity (the CSI of each subband must be measured and reported). For example, with R=1 and R=2 (the number of PMI subbands per CQI subband), the maximum value of N3 can be 19 and 37, respectively. For a 30kHz subcarrier spacing (SCS) with a 100MHz BW, there can be 273 RBs, where the PMI subband size is {16, 32} (for R=1) or {8, 16} (for R=2).

[0119] One potential problem is that a larger subband size may lead to frequency selectivity within the subband, which may not be captured in the CSI within the subband. While a smaller subband size can help avoid frequency selectivity by allowing for more fine-grained CSI reporting, it will increase N3 with the corresponding increase in UE complexity (e.g., assuming per-subband singular value decomposition (SVD)).

[0120] Various aspects of this disclosure can utilize the following concept: for a larger {N1,N2}, a narrower digital beam is possible, which can have a corresponding single / dominant path delay per beam.

[0121] However, aspects of this disclosure provide options for removing frequency selectivity prior to SVD (e.g., based on channel measurements). H The proposed technique, for example by allowing a single SVD based on flat bandwidth, may eliminate the need for arbitrarily finer frequency granularity to constrain UE complexity.

[0122] This disclosure provides techniques for fine-grained frequency-domain (FD) channel state information (CSI) over large bandwidths. For example, in some aspects, the UE can select multiple SD bases from a set of candidate SD bases based on CSI-RS measurements, calculate FD phase rotation parameters based on FD phase rotation units smaller than the subband size, and transmit CSI including indications of the multiple SD bases and the FD phase rotation parameters. FD phase rotation parameters with finer granularity than the corresponding subband allow the network to substantially consider frequency selectivity within the subband without the additional complexity and overhead that would lead to an increase in N3.

[0123] The technique for CSI reporting using FD phase rotation units smaller than the sub-band size proposed in this article can be found at [reference needed]. Figure 8 Understanding the call flow diagram 800. In some aspects, Figure 8 The UE shown can be about Figure 1 and Figure 3 Examples of UE 104 depicted and described. In some respects, Figure 8 The network entities shown can be relative to Figure 1 and Figure 3 The BS 102 depicted and described (e.g., gNB) or relative to Figure 2 Examples of decomposed base stations depicted and described.

[0124] As illustrated at 802, network entities can configure the UE for CSI reporting based on multiple SD bases (i.e., Type II CSI) and subband size.

[0125] As illustrated at 804, a network entity may send CSI-RS resources (e.g., non-pre-decoded CSI-RS resources). CSI-RS resources may also be indicated as part of the configuration.

[0126] As illustrated at 806, the UE can select multiple SD bases from a set of candidate SD bases associated with the codebook of the configured (Type II) CSI based on measurements of the CSI-RS.

[0127] As illustrated at 808, the UE can calculate FD phase rotation parameters based on FD phase rotation units smaller than the subband size, each FD phase rotation parameter being specific to one of a plurality of SD bases.

[0128] As illustrated at 810, the UE can then send a CSI report including indications of multiple SD base and FD phase rotation parameters. The network entity can then use pre-decoding to send a PDSCH based on the CSI report, as illustrated at 812.

[0129] For reference Figure 9 The example broadband diagram 900 is shown to illustrate the concept of FD phase rotation units smaller than the subband size. As illustrated, the broadband can span N3 subbands 910 and... K 920 FD domain rotation units, of which K >N3, which makes each frequency rotation unit smaller than the subband size (e.g., each frequency rotation unit can be 1 or 2 RBs).

[0130] Assuming report L If there are SD bases, the UE can report the FD phase rotation parameters based on the FD phase rotation unit size. , ).For example, It can be defined as the phase that rotates across the broadband on the FD phase rotation unit. In some cases, the size of the FD phase rotation unit can be implicitly indicated according to the configured CSI-RS frequency density (e.g., as 1 or 2 RBs).

[0131] Various aspects of this disclosure provide for use with A variety of quantifiable options. Based on the first option, It can be quantized into integers, for example, it is determined by K: {0,1,…K-1}, where K Is it like this? Figure 9 The total number of FD phase rotation units in the illustrated broadband.

[0132] According to the second option, Oversampling can be used to quantize into scores. For example, scores can be quantized into scores. K and Determined as: {0, ,…1,1+ ,…K- }, in Indicates the oversampling factor (e.g., =4).

[0133] According to some aspects, It can be defined as beam-dependent. For example, for the selected SD base... of The value can be relative to a reference SD base (e.g., the first selected SD base #0). Therefore, in this scenario, for the total... L The selected SD base is not a report. of L Instead of a single value, it can report a total. L -1 .

[0134] According to some aspects, It can be common to polarizations (e.g., common to both polarizations). Depending on certain aspects, It can be common to all layers (e.g., common to all transmitting layers associated with CSI). In other cases, It can be layer-specific (e.g., having different values ​​for each sending layer report associated with CSI).

[0135] Depending on certain aspects, the reported FD phase rotation can be port-specific. For example, for a Type II port selection codebook, the reported FD phase rotation value ( , (where L is the number of selected ports) can be port-specific.

[0136] Various other FD selection mechanisms are provided in all aspects of this disclosure (except for) (Except for...). In some cases, it may not even be necessary to report the FD base selection. For example, in one case, the number of FD bases selected is M=1, so it may only be FD base #0 (FD phase-rotated channel measurements are frequency-flat), and it may not need to be reported.

[0137] The FD base selection used for PMI can be layer-common (e.g., it may be required when M=2) and can be associated with a total of N3 subband configurations. In some cases, layer-common FD windows (e.g., windows with consecutive taps {0, 1} (a window of size 2) or {0, 1, 2, 3} (a window of size 4)) can be configured for FD base selection. In some cases, the FD base selection used for PMI can be layer-specific and associated with a total of N3 subband configurations (e.g., for each layer, the UE selects multiple FD bases from a total of N3 FD bases).

[0138] Various aspects of this disclosure present options for the FD granularity of the UE-assumed PDSCH for CQI calculation and reporting. According to a first option, CQI can be reported based on the UE-assumed PDSCH pre-decoded using FD phase rotation at the Physical Resource Block Group (PRG) level (e.g., for 2 or 4 RBs). In this case, the UE can assume that the delayed quasi-co-located (QCL) source of the UE-assumed PDSCH is associated with the CSI-RS used for this measurement / reporting.

[0139] According to the second option, CQI can be reported based on the UE-assumed PDSCH, which is pre-decoded using FD phase rotation at the same level as the FD phase rotation unit (e.g., at the RB level). According to the third option, CQI can be reported based on the UE-assumed PDSCH, which is pre-decoded using FD phase rotation at the subcarrier level. For both the second and third options, the UE can assume that the CSI-RS used for this measurement / reporting is not associated with the delayed QCL source of the UE-assumed PDSCH.

[0140] As an illustrative example, the UE can target the selected SD base. The phase rotation value is reported based on the size of the FD phase rotation unit, which is one RB. According to the first option (e.g., in the case of PRG size = 4 RBs), it is possible to utilize the SD base. Phase difference between two adjacent PRGs A pre-decoder is used to pre-decode the PDSCH assumed by the UE. Depending on a third option (e.g., subcarrier level), a pre-decoder with SD-based... Phase difference between two adjacent subcarriers The pre-decoder is used to pre-decode the PDSCH assumed by the UE. In some cases, the CQI subband can reuse the old method (e.g., R = 1 or 2 PMI subbands per CQI subband).

[0141] According to some aspects, It can be reported as part of the two-part CSI reporting mechanism. In such cases, It can be packaged into Part 2 (CSI Part 2). For example... Figure 10 The examples in Table 1000 include The CSI fields can be packaged into group 0 (G0) or group 1 (G1) of CSI part 2.

[0142] The technique proposed in this paper can remove frequency selectivity (based on channel measurement H) before SVD without increasing N3, because a single SVD can be based on flat broadband / a single SVD can be understood through mathematical analysis involving multiple steps.

[0143] Based on the first step, via SD compression, "beamforming" channel measurement... (i.e., channel measurement compressed in the spatial domain) Digital beamforming can be performed on each frequency domain (FD) phase rotation unit (e.g., 1 or 2 RBs based on the CSI-RS frequency density) with finer precision than older subbands, where... (For example, for a 30kHz SCS with a 100MHz bandwidth,) =273 RBs, assuming the FD phase rotation unit size is 1 RB). This channel measurement can be expressed as follows: .

[0144] According to the second step, prior to SVD (or eigenvalue decomposition / EVD), the polar common FD phase rotation can be applied as follows: For the beam (i.e., the SD base, which will be referred to as the beam in the mathematical steps described below). : , in Can be used as a beam The delay offset between the single / dominant path and the reference beam (e.g., the first selected beam 0) is obtained. As noted above, It can be defined as an integer {0,...,K-1}, which may be sufficient for large bandwidths (e.g., 100MHz), or it can be defined as a fraction (e.g., using FD oversampling). Since this operation is performed before SVD, It should be a public layer.

[0145] According to the third step, SVD (EVD) can be performed using the following: .

[0146] Based on the first option that reduces complexity Available The average is calculated, and single SVD can be performed over wideband (i.e., corresponding to N3=1). This option may be suitable for per-beam single-path environments, where delay offset... The frequency selectivity has been well compensated for.

[0147] The second option is potentially more complex than the first option (but may maintain a similar / same complexity as the existing old-style conventional Type II). It can be averaged across N3 subbands and per-subband SVD can be performed. Even if each beam is not single-path dominated, the effective delay spread across all beams can still be reduced, and the frequency can be selectively tolerable with older subband sizes.

[0148] In some cases It can be obtained as (assuming "ideal" option 1 broadband single SVD) , so that: .

[0149] According to the third step, based on the following equation:

[0150] , in (size ) is a line (size Assuming the first option is broadband single SVD, for FD non-rotation. (That is, rotate "back") The pre-decoder can be (for each layer) ): in (Reported FD-based selection) and The reported coefficients can be based on "per-beam FD phase rotation". To calculate, and The reported SD base (beam) can be selected. Note that, for simplicity, only a single polarization (pol#0) is illustrated in the equation above. The index L×K in the equation above indicates that the equation can be applied to a single polarity across K frequency rotation units (therefore, L rows, not 2L rows). Example Operation

[0151] Figure 11 This illustrates the use of user equipment (UE) such as Figure 1 and Figure 3An example of a method 1100 for wireless communication at UE 104.

[0152] Method 1100 begins at step 1105, wherein signaling is received from a network entity to configure the UE for Channel State Information (CSI) reporting based on multiple spatial domain (SD) bases and subband sizes. In some cases, this step refers to the operation as described in reference... Figure 13 The circuitry and / or code described for receiving, or that can be executed by the circuitry and / or the code.

[0153] Method 1100 then proceeds to step 1110, where multiple SD bases are selected from the set of candidate SD bases based on CSI reference signal (CSI-RS) measurements. In some cases, this step refers to the operation of referencing... Figure 13 The circuit and / or code described for selection or that can be executed by the circuit and / or the code.

[0154] Method 1100 then proceeds to step 1115, wherein FD phase rotation parameters specific to each of the plurality of SD bases are calculated based on frequency domain (FD) phase rotation units smaller than the subband size for at least some of the SD bases. In some cases, this step refers to the operation as described in reference Figure 13 The circuitry and / or code used for computation described herein, or that can be executed by the circuitry and / or the code.

[0155] Method 1100 then proceeds to step 1120, in which a CSI including indications of multiple SD bases and FD phase rotation parameters is sent to the network entity. In some cases, this step refers to the operation as described in reference... Figure 13 The circuitry and / or code described for transmitting, or that can be executed by the circuitry and / or the code.

[0156] In some aspects, method 1100 also includes determining the size of the FD phase rotation unit based on the CSI-RS frequency density. In some cases, this step refers to... (referring to...) Figure 13 The circuit and / or code described for determination, or that can be executed by the circuit and / or the code.

[0157] In some respects, the FD phase rotation parameters are quantized into integer values ​​based on the total number of FD phase rotation units in the broadband.

[0158] In some aspects, the FD phase rotation parameters are quantized into fractional values ​​based on the total number of FD phase rotation units and the oversampling parameters in the broadband.

[0159] In some respects, the values ​​of at least some of the FD phase rotation parameters are relative to a reference SD base among a plurality of SD bases.

[0160] In some respects, each FD phase rotation parameter in the FD phase rotation parameters is common to both polarizations.

[0161] In some respects, each FD phase rotation parameter in the FD phase rotation parameters is common to all transmit layers associated with CSI.

[0162] In some respects, the FD phase rotation parameters include FD phase rotation parameters specific to the transmit layer associated with CSI.

[0163] In some respects, CSI is based on the port selection codebook; and the FD phase rotation parameters include FD phase rotation parameters specific to each of the multiple selected ports.

[0164] In some respects, apart from the frequency domain (FD) phase rotation parameter, CSI lacks indication of FD basis selection.

[0165] In some respects, in addition to the frequency domain (FD) phase rotation parameter, CSI includes at least one of the layer common or layer-specific FD basis selections.

[0166] In some respects, CSI includes a Channel Quality Indicator (CQI); and the CQI is calculated based on a UE-assumed PDSCH with a frequency granularity of at least one of the following: Physical Resource Block Group (PRG) level, FD phase rotation unit size, resource block (RB) level, or subcarrier level.

[0167] In some respects, based on the fact that the frequency granularity is smaller than that of the PRG, delay-dependent quasi-co-address (QCL) is not assumed between the UE's assumed PDSCH and CSI-RS.

[0168] In some respects, the CSI is transmitted at least in the first and second parts; and the FD phase rotation parameters are transmitted in either packing group zero or packing group one of the second part.

[0169] In one aspect, method 1100 or any aspect thereof may be made by means of a device (such as...) Figure 13 The communication device 1300 is used to perform the method 1100, which includes various components capable of operating, being configured, or adapted to perform the method. The communication device 1300 is described in more detail below.

[0170] It should be noted that Figure 11 This is merely one example of a method, and other methods that include fewer, additional, or alternative steps may also be consistent with this disclosure.

[0171] Figure 12 This shows the network entities (such as Figure 1 and Figure 3 BS 102 or as relative to Figure 2 An example of a method 1200 for wireless communication at a decomposed base station (discussed in this paper).

[0172] Method 1200 begins at step 1205, wherein signaling is sent to the User Equipment (UE) to configure the UE for Channel State Information (CSI) reporting based on multiple spatial domain (SD) bases and subband sizes. In some cases, this step refers to the operation as described in reference... Figure 13 The circuitry and / or code described for transmitting, or that can be executed by the circuitry and / or the code.

[0173] Then, method 1200 proceeds to step 1210, where a CSI reference signal (CSI-RS) is transmitted on the resources associated with the set of candidate SD bases. In some cases, this step refers to the operation of referencing... Figure 13 The circuitry and / or code described for transmitting, or that can be executed by the circuitry and / or the code.

[0174] Method 1200 then proceeds to step 1215, wherein a CSI is received from the UE, the CSI including indications of FD phase rotation parameters specific to each of the plurality of SD bases and for at least some of the plurality of SD bases based on a frequency domain (FD) phase rotation unit smaller than the sub-band size. In some cases, the operation of this step refers to, as referenced Figure 13 The circuitry and / or code described for receiving, or that can be executed by the circuitry and / or the code.

[0175] Then, method 1200 proceeds to step 1220, where a PDSCH is sent to the UE using pre-decoding based on the received CSI. In some cases, this step refers to the operation as described in reference... Figure 13 The circuitry and / or code described for transmitting, or that can be executed by the circuitry and / or the code.

[0176] In some aspects, method 1200 also includes determining the size of the FD phase rotation unit based on the CSI-RS frequency density. In some cases, this step refers to... (referring to...) Figure 13 The circuit and / or code described for determination, or that can be executed by the circuit and / or the code.

[0177] In some respects, the FD phase rotation parameters are quantized into integer values ​​based on the total number of FD phase rotation units in the broadband.

[0178] In some aspects, the FD phase rotation parameters are quantized into fractional values ​​based on the total number of FD phase rotation units and the oversampling parameters in the broadband.

[0179] In some respects, the values ​​of at least some of the FD phase rotation parameters are relative to a reference SD base among a plurality of SD bases.

[0180] In some respects, each FD phase rotation parameter in the FD phase rotation parameters is common to both polarizations.

[0181] In some respects, each FD phase rotation parameter in the FD phase rotation parameters is common to all transmit layers associated with CSI.

[0182] In some respects, the FD phase rotation parameters include FD phase rotation parameters specific to the transmit layer associated with CSI.

[0183] In some respects, CSI is based on the port selection codebook; and the FD phase rotation parameters include FD phase rotation parameters specific to each of the multiple selected ports.

[0184] In some respects, apart from the frequency domain (FD) phase rotation parameter, CSI lacks indication of FD basis selection.

[0185] In some respects, in addition to the frequency domain (FD) phase rotation parameter, CSI includes at least one of the layer common or layer-specific FD basis selections.

[0186] In some respects, CSI includes a Channel Quality Indicator (CQI); and the CQI is calculated based on a UE-assumed PDSCH with a frequency granularity of at least one of the following: Physical Resource Block Group (PRG) level, FD phase rotation unit size, resource block (RB) level, or subcarrier level.

[0187] In some respects, based on the fact that the frequency granularity is smaller than that of the PRG, delay-dependent quasi-co-address (QCL) is not assumed between the UE's assumed PDSCH and CSI-RS.

[0188] In some respects, CSI is received at least in the first and second parts; and the FD phase rotation parameters are transmitted in either packing group zero or packing group one of the second part.

[0189] In one aspect, method 1200 or any aspect thereof may be made by means of a device (such as...) Figure 13 The communication device 1300 is used to perform the method 1200, which includes various components capable of operating, being configured, or adapted to perform the method. The communication device 1300 is described in more detail below.

[0190] It should be noted that Figure 12 This is merely one example of a method, and other methods that include fewer, additional, or alternative steps may also be consistent with this disclosure. Example communication device

[0191] Figure 13 Various aspects of the example communication device 1300 are described. In some aspects, the communication device 1300 is user equipment, such as those described above relative to... Figure 1 and Figure 3 The UE 104 is described. In some respects, the communication device 1300 is a network entity, such as... Figure 1 and Figure 3 BS 102 or as relative to Figure 2 The decomposed base station under discussion.

[0192] Communication device 1300 includes a processing system 1305 coupled to transceiver 1375 (e.g., transmitter and / or receiver). In some aspects (e.g., when communication device 1300 is a network entity), processing system 1305 may be coupled to network interface 1385, which is configured to communicate via a communication link (such as, as described herein, relative to...). Figure 2 The described backhaul link, midhaul link, and / or fronthaul link acquire and transmit signals for communication device 1300. Transceiver 1375 is configured to transmit and receive signals for communication device 1300 via antenna 1380, such as the various signals described herein. Processing system 1305 may be configured to perform processing functions of communication device 1300, including processing signals received by communication device 1300 and / or to be transmitted by the communication device.

[0193] Processing system 1305 includes one or more processors 1310. In various aspects, the one or more processors 1310 may be represented as relative to... Figure 3 The described receiver processor 358, transmitter processor 364, TX MIMO processor 366, and / or controller / processor 380 are one or more of these. In various aspects, one or more processors 1310 may represent, as relative to... Figure 3 The described receiver processor 338, transmitter processor 320, TX MIMO processor 330, and / or controller / processor 340 are one or more of these. One or more processors 1310 are coupled to computer-readable medium / memory 1340 via bus 1370. In some aspects, the computer-readable medium / memory 1340 is configured to store instructions (e.g., computer-executable code) that, when executed by one or more processors 1310, cause one or more processors 1310 to perform relative to... Figure 11The described method 1100 or any aspect thereof; and relative to Figure 12 The method 1200 described herein or any aspect thereof. It should be noted that references to processors performing the functions of communication device 1300 may include one or more processors 1310 performing those functions of communication device 1300.

[0194] In the depicted example, computer-readable medium / memory 1340 stores code (e.g., executable instructions), such as code 1345 for receiving, code 1350 for selecting, code 1355 for calculating, code 1360 for transmitting, and code 1365 for determining. Processing using the code 1345 for receiving, the code 1350 for selecting, the code 1355 for calculating, the code 1360 for transmitting, and the code 1365 for determining enables the communication device 1300 to perform actions relative to... Figure 11 The described method 1100 or any aspect thereof; and relative to Figure 12 The method 1200 described or any aspect thereof.

[0195] One or more processors 1310 include circuitry configured to implement (e.g., execute) code stored in a computer-readable medium / memory 1340. This circuitry includes circuitry 1315 for receiving, circuitry 1320 for selecting, circuitry 1325 for calculating, circuitry 1330 for transmitting, and circuitry 1335 for determining. The processing using the circuitry 1315 for receiving, the circuitry 1320 for selecting, the circuitry 1325 for calculating, the circuitry 1330 for transmitting, and the circuitry 1335 for determining enables the communication device 1300 to perform operations relative to… Figure 11 The described method 1100 or any aspect thereof; and relative to Figure 12 The method 1200 described or any aspect thereof.

[0196] The various components of the communication device 1300 can provide for performing relative to Figure 11 The described method 1100 or any aspect thereof; and relative to Figure 12 The described method 1200 or any aspect thereof. For example, components for sending, transmitting, or outputting for transmission may include... Figure 3 The transceiver 354 and / or antenna 352 of the illustrated UE 104 Figure 3 The transceiver 332 and / or antenna 334 of the illustrated BS 102 Figure 13 The communication device 1300 includes a transceiver 1375 and an antenna 1380. Components for receiving or acquiring data may include... Figure 3The transceiver 354 and / or antenna 352 of the illustrated UE 104 Figure 3 The transceiver 332 and / or antenna 334 of the illustrated BS 102 Figure 13 The transceiver 1375 and antenna 1380 of the communication equipment 1300. Example Terms

[0197] Specific implementation examples are described in the following numbered clauses:

[0198] Clause 1: A method for wireless communication at a user equipment (UE), the method comprising: receiving from a network entity signaling to configure the UE for channel state information (CSI) reporting based on a plurality of spatial domain (SD) bases and subband sizes; selecting the plurality of SD bases from a set of candidate SD bases based on CSI reference signal (CSI-RS) measurements; calculating FD phase rotation parameters specific to each of the plurality of SD bases for at least some of the SD bases based on frequency domain (FD) phase rotation units smaller than the subband size; and transmitting to the network entity a CSI including indications of the plurality of SD bases and the FD phase rotation parameters.

[0199] Clause 2: The method according to Clause 1 further includes determining the size of the FD phase rotation unit based on the CSI-RS frequency density.

[0200] Clause 3: The method according to any one of Clauses 1 to 2, wherein the FD phase rotation parameter is quantized into an integer value based on the total number of the FD phase rotation units in the broadband.

[0201] Clause 4: The method according to any one of Clauses 1 to 3, wherein the FD phase rotation parameter is quantized into a fractional value based on the total number of the FD phase rotation units in the broadband and the oversampling parameter.

[0202] Clause 5: The method according to any one of Clauses 1 to 4, wherein the values ​​of at least some of the FD phase rotation parameters are relative to a reference SD base among the plurality of SD bases.

[0203] Clause 6: The method according to any one of Clauses 1 to 5, wherein each of the FD phase rotation parameters is common to both polarizations.

[0204] Clause 7: The method according to any one of Clauses 1 to 6, wherein each of the FD phase rotation parameters is common to all transmit layers associated with the CSI.

[0205] Clause 8: The method according to any one of Clauses 1 to 7, wherein the FD phase rotation parameters include FD phase rotation parameters specific to the transmit layer associated with the CSI.

[0206] Clause 9: The method according to any one of Clauses 1 to 8, wherein: the CSI is based on a port selection codebook; and the FD phase rotation parameters include FD phase rotation parameters specific to each of the plurality of selected ports.

[0207] Clause 10: The method according to any one of Clauses 1 to 9, wherein the CSI lacks an indication of FD base selection except for the frequency domain (FD) phase rotation parameter.

[0208] Clause 11: The method according to any one of Clauses 1 to 10, wherein, in addition to the frequency domain (FD) phase rotation parameter, the CSI includes at least one of layer common or layer specific FD base selection.

[0209] Clause 12: The method according to any one of Clauses 1 to 11, wherein: the CSI includes a Channel Quality Indicator (CQI); and the CQI is calculated based on a UE-assumed PDSCH having a frequency granularity of at least one of the following: Physical Resource Block Group (PRG) level, the size of the FD phase rotation unit, resource block (RB) level, or subcarrier level.

[0210] Clause 13: The method according to Clause 12, wherein, based on the frequency granularity being smaller than the size of the PRG, delay-dependent quasi-co-addressing (QCL) is not assumed between the UE's assumed PDSCH and the CSI-RS.

[0211] Clause 14: The method according to any one of Clauses 1 to 13, wherein: the CSI is transmitted at least in the first and second parts; and the FD phase rotation parameter is transmitted in either packing group zero or packing group one of the second part.

[0212] Clause 15: A method for wireless communication at a network entity, the method comprising: transmitting to a user equipment (UE) signaling configured for channel state information (CSI) reporting by the UE based on a plurality of spatial domain (SD) bases and subband sizes; transmitting a CSI reference signal (CSI-RS) on resources associated with a set of candidate SD bases; receiving a CSI from the UE, the CSI including indications of the plurality of SD bases and FD phase rotation parameters specific to each of the plurality of SD bases based on a frequency domain (FD) phase rotation unit smaller than the subband size for at least some of the plurality of SD bases; and transmitting a PDSCH to the UE using pre-decoding based on the received CSI.

[0213] Clause 16: The method of Clause 15 further includes determining the size of the FD phase rotation unit based on the CSI-RS frequency density.

[0214] Clause 17: The method according to any one of Clauses 15 to 16, wherein the FD phase rotation parameter is quantized into an integer value based on the total number of the FD phase rotation units in the broadband.

[0215] Clause 18: The method according to any one of Clauses 15 to 17, wherein the FD phase rotation parameter is quantized into a fractional value based on the total number of the FD phase rotation units in the broadband and the oversampling parameter.

[0216] Clause 19: The method according to any one of Clauses 15 to 18, wherein the values ​​of at least some of the FD phase rotation parameters are relative to a reference SD base among the plurality of SD bases.

[0217] Clause 20: The method according to any one of Clauses 15 to 19, wherein each of the FD phase rotation parameters is common to both polarizations.

[0218] Clause 21: The method according to any one of Clauses 15 to 20, wherein each of the FD phase rotation parameters is common to all transmit layers associated with the CSI.

[0219] Clause 22: The method according to any one of Clauses 15 to 21, wherein the FD phase rotation parameters include FD phase rotation parameters specific to the transmit layer associated with the CSI.

[0220] Clause 23: The method according to any one of Clauses 15 to 22, wherein: the CSI is based on a port selection codebook; and the FD phase rotation parameters include FD phase rotation parameters specific to each of the plurality of selected ports.

[0221] Clause 24: The method according to any one of Clauses 15 to 23, wherein the CSI lacks an indication of FD base selection except for the frequency domain (FD) phase rotation parameter.

[0222] Clause 25: The method according to any one of Clauses 15 to 24, wherein, in addition to the frequency domain (FD) phase rotation parameter, the CSI includes at least one of layer common or layer specific FD base selection.

[0223] Clause 26: The method according to any one of Clauses 15 to 25, wherein: the CSI includes a Channel Quality Indicator (CQI); and the CQI is calculated based on a UE-assumed PDSCH having a frequency granularity of at least one of the following: Physical Resource Block Group (PRG) level, the size of the FD phase rotation unit, resource block (RB) level, or subcarrier level.

[0224] Clause 27: The method according to Clause 26, wherein, based on the frequency granularity being smaller than the size of the PRG, delay-dependent quasi-co-addressing (QCL) is not assumed between the UE's assumed PDSCH and the CSI-RS.

[0225] Clause 28: The method according to any one of Clauses 15 to 27, wherein: the CSI is received at least in the first and second parts; and the FD phase rotation parameters are transmitted in either packing group zero or packing group one of the second part.

[0226] Clause 29: An apparatus comprising: a memory including executable instructions; and a processor configured to execute the executable instructions and cause the apparatus to perform a method according to any one of Clauses 1 to 28.

[0227] Clause 30: An apparatus comprising components for performing the method according to any one of Clauses 1 to 28.

[0228] Clause 31: A non-transitory computer-readable medium comprising executable instructions that, when executed by a processor of a device, cause the device to perform the method according to any one of Clauses 1 to 28.

[0229] Clause 32: A computer program product embodied on a computer-readable storage medium, said computer-readable storage medium including code for performing a method according to any one of Clauses 1 to 28. Additional Notes

[0230] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein do not limit the scope, applicability, or aspects set forth in the claims. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, the function and arrangement of the elements discussed may be changed without departing from the scope of this disclosure. Various processes or components may be omitted, substituted, or added as appropriate in various examples. For example, the described methods may be performed in a different order than described, and various actions may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement an apparatus or practice. Moreover, the scope of this disclosure is intended to cover such apparatuses or methods practiced using other structures, functionalities, or structures and functionalities that complement or replace the various aspects of this disclosure set forth herein. It should be understood that any aspect of the disclosure herein may be embodied by one or more elements of the claims.

[0231] The various exemplary logic blocks, modules, and circuits described in this disclosure can be implemented or executed using a general-purpose processor, digital signal processor (DSP), ASIC, field-programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic device, discrete hardware component, or any combination thereof designed to perform the functions described herein. While the general-purpose processor may be a microprocessor, in alternative embodiments, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, a system-on-a-chip (SoC), or any other such configuration.

[0232] As used herein, "processor," "at least one processor," or "one or more processors" generally refers to a single processor configured to perform one or more operations, or multiple processors configured to collectively perform one or more operations. In the case of multiple processors, the execution of one or more operations may be divided among different processors, but one processor may perform multiple operations, and multiple processors may collectively perform a single operation. Similarly, "memory," "at least one memory," or "one or more memory" generally refers to a single memory configured to store data and / or instructions, or multiple memories configured to collectively store data and / or instructions.

[0233] As used in this article, the phrase “at least one of the items” refers to any combination of these items, including a single member. As an example, “at least one of a, b, or c” is intended to cover: a, b, c, ab, ac, bc, and abc, as well as any combination with multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbb, cc, and ccc, or any other ordering of a, b, and c).

[0234] As used herein, the term "determine" encompasses a wide variety of actions. For example, "determine" can include calculation, operation, processing, deduction, investigation, lookup (e.g., searching in a table, database, or other data structure), assertion, and so on. Additionally, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), and so on. Furthermore, "determine" can include parsing, selecting, picking, building, and so on.

[0235] The methods disclosed herein include one or more actions for implementing the methods. These actions may be interchanged without departing from the scope of the claims. In other words, unless a specific order of actions is specified, the order and / or use of a particular action may be modified without departing from the scope of the claims. Furthermore, the various operations of the methods described above may be performed by any suitable component capable of performing the corresponding function. This component may include various hardware and / or software components and / or modules, including but not limited to circuits, application-specific integrated circuits (ASICs), or processors.

[0236] The following claims are not intended to be limited to the aspects shown herein, but should be given the full scope consistent with the language of the claims. Within the claims, unless specifically stated otherwise, reference to the singular form of an element is not intended to mean “one and only one,” but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. No element of any claim shall be interpreted in accordance with 35 USC §112(f) unless that element is explicitly stated using the phrase “for a component of.” All structural and functional equivalents of the elements throughout the various aspects described herein that are known to a person of ordinary skill in the art, or will later be known, are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be offered to the public, whether or not such disclosure is explicitly recited in the claims.

Claims

1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: At least one memory, the at least one memory including computer-executable instructions; and One or more processors, the one or more processors being configured to execute the computer-executable instructions and cause the UE to: Receive signaling from network entities to configure the UE for Channel State Information (CSI) reporting based on multiple spatial domain (SD) bases and subband sizes; The plurality of SD bases are selected from a set of candidate SD bases based on CSI reference signal (CSI-RS) measurements; For at least some of the plurality of SD bases, FD phase rotation parameters specific to each of the plurality of SD bases are calculated based on a frequency domain (FD) phase rotation unit smaller than the sub-band size; as well as Send a CSI to the network entity, including indications of the plurality of SD bases and the FD phase rotation parameters.

2. The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to determine the size of the FD phase rotation unit based on the CSI-RS frequency density.

3. The apparatus of claim 1, wherein the FD phase rotation parameters are quantized into integer values ​​based on the total number of the FD phase rotation units in the broadband.

4. The apparatus of claim 1, wherein the FD phase rotation parameters are quantized into fractional values ​​based on the total number of the FD phase rotation units in the broadband and the oversampling parameters.

5. The apparatus of claim 1, wherein the values ​​of at least some of the FD phase rotation parameters are relative to a reference SD base among the plurality of SD bases.

6. The apparatus of claim 1, wherein each of the FD phase rotation parameters is common to both polarizations.

7. The apparatus of claim 1, wherein each of the FD phase rotation parameters is common to all transmit layers associated with the CSI.

8. The apparatus of claim 1, wherein the FD phase rotation parameters include FD phase rotation parameters specific to the transmit layer associated with the CSI.

9. The apparatus according to claim 1, wherein: The CSI is based on a port selection codebook; and The FD phase rotation parameters include FD phase rotation parameters specific to each of the multiple selected ports.

10. The apparatus of claim 1, wherein the CSI lacks an indication of FD base selection except for the frequency domain (FD) phase rotation parameter.

11. The apparatus of claim 1, wherein, in addition to the frequency domain (FD) phase rotation parameter, the CSI includes at least one of layer common or layer specific FD base selection.

12. The apparatus according to claim 1, wherein: The CSI includes a Channel Quality Indicator (CQI); and The CQI is calculated based on the UE-assumed PDSCH with frequency granularity of at least one of the following: Physical Resource Block Group (PRG) level, the size of the FD phase rotation unit, resource block (RB) level, or subcarrier level.

13. The apparatus of claim 12, wherein, based on the fact that the frequency granularity is smaller than the size of the PRG, delay-dependent quasi-co-addressing (QCL) is not assumed between the UE-assumed PDSCH and the CSI-RS.

14. The apparatus according to claim 1, wherein: The CSI is sent at least in the first and second parts; and The FD phase rotation parameters are sent in either packing group zero or packing group one of the second part.

15. An apparatus for wireless communication at a network entity, the apparatus comprising: At least one memory, the at least one memory including computer-executable instructions; and One or more processors, the one or more processors being configured to execute the computer-executable instructions and cause the network entity to: Send signaling to the user equipment (UE) to configure the UE for channel state information (CSI) reporting based on multiple spatial domain (SD) bases and subband sizes; Send CSI reference signals (CSI-RS) on resources associated with the set of candidate SD bases; Receive CSI from the UE, the CSI including an indication of the plurality of SD bases and FD phase rotation parameters specific to each of the plurality of SD bases based on a frequency domain (FD) phase rotation unit smaller than the sub-band size for at least some of the plurality of SD bases; and Based on the received CSI, a PDSCH is sent to the UE using pre-decoding.

16. The apparatus of claim 15, wherein the one or more processors are further configured to cause the network entity to determine the size of the FD phase rotation unit based on the CSI-RS frequency density.

17. The apparatus of claim 15, wherein the FD phase rotation parameters are quantized into integer values ​​based on the total number of the FD phase rotation units in the broadband.

18. The apparatus of claim 15, wherein the FD phase rotation parameters are quantized into fractional values ​​based on the total number of the FD phase rotation units in the broadband and the oversampling parameters.

19. The apparatus of claim 15, wherein the values ​​of at least some of the FD phase rotation parameters are relative to a reference SD base among the plurality of SD bases.

20. The apparatus of claim 15, wherein each of the FD phase rotation parameters is common to both polarizations.

21. The apparatus of claim 15, wherein each of the FD phase rotation parameters is common to all transmit layers associated with the CSI.

22. The apparatus of claim 15, wherein the FD phase rotation parameters include FD phase rotation parameters specific to the transmit layer associated with the CSI.

23. The apparatus according to claim 15, wherein: The CSI is based on a port selection codebook; and The FD phase rotation parameters include FD phase rotation parameters specific to each of the multiple selected ports.

24. The apparatus of claim 15, wherein the CSI lacks an indication of FD base selection, except for the frequency domain (FD) phase rotation parameter.

25. The apparatus of claim 15, wherein, in addition to the frequency domain (FD) phase rotation parameter, the CSI includes at least one of layer common or layer specific FD base selection.

26. The apparatus according to claim 15, wherein: The CSI includes a Channel Quality Indicator (CQI); and The CQI is calculated based on the UE-assumed PDSCH with frequency granularity of at least one of the following: Physical Resource Block Group (PRG) level, the size of the FD phase rotation unit, resource block (RB) level, or subcarrier level.

27. The apparatus of claim 26, wherein, based on the fact that the frequency granularity is smaller than the size of the PRG, delay-dependent quasi-co-addressing (QCL) is not assumed between the UE-assumed PDSCH and the CSI-RS.

28. The apparatus according to claim 15, wherein: The CSI is received at least in the first and second parts; and The FD phase rotation parameters are sent in either packing group zero or packing group one of the second part.

29. A method for conducting wireless communication at a user equipment (UE), the method comprising: Receive signaling from network entities to configure the UE for Channel State Information (CSI) reporting based on multiple spatial domain (SD) bases and subband sizes; The plurality of SD bases are selected from a set of candidate SD bases based on CSI reference signal (CSI-RS) measurements; For at least some of the plurality of SD bases, FD phase rotation parameters specific to each of the plurality of SD bases are calculated based on a frequency domain (FD) phase rotation unit smaller than the sub-band size; as well as Send a CSI to the network entity, including indications of the plurality of SD bases and the FD phase rotation parameters.

30. A method for conducting wireless communication at a network entity, the method comprising: Send signaling to the user equipment (UE) to configure the UE for channel state information (CSI) reporting based on multiple spatial domain (SD) bases and subband sizes; Send CSI reference signals (CSI-RS) on resources associated with the set of candidate SD bases; Receive CSI from the UE, the CSI including an indication of the plurality of SD bases and FD phase rotation parameters specific to each of the plurality of SD bases based on a frequency domain (FD) phase rotation unit smaller than the sub-band size for at least some of the plurality of SD bases; and Based on the received CSI, a PDSCH is sent to the UE using pre-decoding.

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