WO2024147863A1 - Détails pour mappage de srs sur 8 ports à de multiples symboles ofdm - Google Patents

Détails pour mappage de srs sur 8 ports à de multiples symboles ofdm Download PDF

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Publication number
WO2024147863A1
WO2024147863A1 PCT/US2023/081393 US2023081393W WO2024147863A1 WO 2024147863 A1 WO2024147863 A1 WO 2024147863A1 US 2023081393 W US2023081393 W US 2023081393W WO 2024147863 A1 WO2024147863 A1 WO 2024147863A1
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WIPO (PCT)
Prior art keywords
srs
srs ports
ports
subset
ofdm symbols
Prior art date
Application number
PCT/US2023/081393
Other languages
English (en)
Inventor
Yi Huang
Yu Zhang
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US18/520,038 external-priority patent/US20240223338A1/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Publication of WO2024147863A1 publication Critical patent/WO2024147863A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • Example aspects presented herein provide various mapping schemes for mapping different sounding reference signal (SRS) ports to different orthogonal frequency division multiplexing (OFDM) symbols.
  • the proposed mapping schemes enable up to eight uplink (UL) transmission (8 Tx) in the multiple input multiple output (MIMO) environment to support four and more layers (e.g., data streams) per user equipment (UE) in UL for a diverse range of applications including customer premises equipment (CPE), fixed wireless access (FWA), vehicle, and industrial devices.
  • CPE customer premises equipment
  • FWA fixed wireless access
  • Various aspects relate generally to wireless communication, and, more particularly, to eight ports SRS mapping to multiple OFDM symbols.
  • One or more processors in the processing system may execute software.
  • Software whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, or any combination thereof.
  • the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, the functions may be stored on or encoded as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes computer storage media. Storage media may be any available media that can be accessed by a computer.
  • aspects, implementations, and/or use cases are described in this application by illustration to some examples, additional or different aspects, implementations and/or use cases may come about in many different arrangements and scenarios. Aspects, implementations, and/or use cases described herein may be implemented across many differing platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, aspects, implementations, and/or use cases may come about via integrated chip implementations and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (Al)-enabled devices, etc.).
  • non-module-component based devices e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, artificial intelligence (Al)-enabled devices, etc.
  • Each of the units may include one or more interfaces or be coupled to one or more interfaces configured to receive or to transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium.
  • Each of the units, or an associated processor or controller providing instructions to the communication interfaces of the units can be configured to communicate with one or more of the other units via the transmission medium.
  • the units can include a wired interface configured to receive or to transmit signals over a wired transmission medium to one or more of the other units.
  • the units can include a wireless interface, which may include a receiver, a transmitter, or a transceiver (such as an RF transceiver), configured to receive or to transmit signals, or both, over a wireless transmission medium to one or more of the other units.
  • a wireless interface which may include a receiver, a transmitter, or a transceiver (such as an RF transceiver), configured to receive or to transmit signals, or both, over a wireless transmission medium to one or more of the other units.
  • the DU 130 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 140.
  • the DU 130 may host one or more of a radio link control (RLC) layer, a medium 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, demodulation, or the like) depending, at least in part, on a functional split, such as those defined by 3 GPP.
  • RLC radio link control
  • MAC medium access control
  • PHY high physical layers
  • the DU 130 may further host one or more low PHY layers.
  • Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 130, or with the control functions hosted by the CU 110.
  • real-time and non-real-time aspects of control and user plane communication with the RU(s) 140 can be controlled by the corresponding DU 130.
  • this configuration can enable the DU(s) 130 and the CU 110 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
  • the SMO Framework 105 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O- eNB) 111, via an 01 interface. Additionally, in some implementations, the SMO Framework 105 can communicate directly with one or more RUs 140 via an 01 interface.
  • the SMO Framework 105 also may include a Non-RT RIC 115 configured to support functionality of the SMO Framework 105.
  • the Near-RT RIC 125 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 110, one or more DUs 130, or both, as well as an O-eNB, with the Near-RT RIC 125.
  • the Non-RT RIC 115 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 125 and may be received at the SMO Framework 105 or the Non-RT RIC 115 from non-network data sources or from network functions. In some examples, the Non-RT RIC 115 or the Near-RT RIC 125 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 115 may monitor long-term trends and patterns for performance and employ AI/ML models to perform corrective actions through the SMO Framework 105 (such as reconfiguration via 01) or via creation of RAN management policies (such as Al policies).
  • SMO Framework 105 such as reconfiguration via 01
  • RAN management policies such as Al policies
  • a base station 102 may include one or more of the CU 110, the DU 130, and the RU 140 (each component indicated with dotted lines to signify that each component may or may not be included in the base station 102).
  • the base station 102 provides an access point to the core network 120 for a UE 104.
  • the base station 102 may include macrocells (high power cellular base station) and/or small cells (low power cellular base station).
  • the small cells include femtocells, picocells, and microcells.
  • a network that includes both small cell and macrocells may be known as a heterogeneous network.
  • a heterogeneous network may also include Home Evolved Node Bs (eNBs) (HeNBs), which may provide service to a restricted group known as a closed subscriber group (CSG).
  • the communication links between the RUs 140 and the UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to an RU 140 and/or downlink (DL) (also referred to as forward link) transmissions from an RU 140 to a UE 104.
  • the communication links may use multiple-input and multiple-output (MEMO) antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links may be through one or more carriers.
  • the base station 102 / UEs 104 may use spectrum up to X MHz (e.g., 5, 10, 15, 20, 100, 400, etc. MHz) bandwidth per carrier allocated in a carrier aggregation of up to a total of Fx MHz (x component carriers) used for transmission in each direction.
  • the carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL).
  • the component carriers may include a primary component carrier and one or more secondary component carriers.
  • a primary component carrier may be referred to as a primary cell (PCell) and a secondary component carrier may be referred to as a secondary cell (SCell).
  • PCell primary cell
  • SCell secondary cell
  • D2D communication link 158 may use the DL/UL wireless wide area network (WWAN) spectrum.
  • the D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH).
  • PSBCH physical sidelink broadcast channel
  • PSDCH physical sidelink discovery channel
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • D2D communication may be through a variety of wireless D2D communications systems, such as for example, BluetoothTM (Bluetooth is a trademark of the Bluetooth Special Interest Group (SIG)), Wi-FiTM (Wi-Fi is a trademark of the Wi-Fi Alliance) based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.
  • BluetoothTM Bluetooth is a trademark of the Bluetooth Special Interest Group (SIG)
  • Wi-FiTM Wi-Fi is a trademark of the Wi-Fi Alliance
  • IEEE Institute of Electrical and Electronics Engineers
  • the wireless communications system may further include a Wi-Fi AP 150 in communication with UEs 104 (also referred to as Wi-Fi stations (STAs)) via communication link 154, e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • UEs 104 also referred to as Wi-Fi stations (STAs)
  • communication link 154 e.g., in a 5 GHz unlicensed frequency spectrum or the like.
  • the UEs 104 / AP 150 may perform a clear channel assessment (CCA) prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • FR2 which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, despite being different from the extremely high frequency (EHF) band (30 GHz - 300 GHz) which is identified by the International Telecommunications Union (ITU) as a “millimeter wave” band.
  • EHF extremely high frequency
  • ITU International Telecommunications Union
  • the base station 102 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and/or antenna arrays to facilitate beamforming.
  • the base station 102 may transmit a beamformed signal 182 to the UE 104 in one or more transmit directions.
  • the UE 104 may receive the beamformed signal from the base station 102 in one or more receive directions.
  • the UE 104 may also transmit a beamformed signal 184 to the base station 102 in one or more transmit directions.
  • the base station 102 may receive the beamformed signal from the UE 104 in one or more receive directions.
  • the base station 102 / UE 104 may perform beam training to determine the best receive and transmit directions for each of the base station 102 / UE 104.
  • the transmit and receive directions for the base station 102 may or may not be the same.
  • the transmit and receive directions for the UE 104 may or may not be the same.
  • the base station 102 may include and/or be referred to as a gNB, Node B, eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP, network node, network entity, network equipment, or some other suitable terminology.
  • the base station 102 can be implemented as an integrated access and backhaul (IAB) node, a relay node, a sidelink node, an aggregated (monolithic) base station with a baseband unit (BBU) (including a CU and a DU) and an RU, or as a disaggregated base station including one or more of a CU, a DU, and/or an RU.
  • IAB integrated access and backhaul
  • BBU baseband unit
  • NG-RAN next generation
  • the core network 120 may include an Access and Mobility Management Function (AMF) 161, a Session Management Function (SMF) 162, a User Plane Function (UPF) 163, a Unified Data Management (UDM) 164, one or more location servers 168, and other functional entities.
  • the AMF 161 is the control node that processes the signaling between the UEs 104 and the core network 120.
  • the AMF 161 supports registration management, connection management, mobility management, and other functions.
  • the SMF 162 supports session management and other functions.
  • the UPF 163 supports packet routing, packet forwarding, and other functions.
  • the UDM 164 supports the generation of authentication and key agreement (AKA) credentials, user identification handling, access authorization, and subscription management.
  • AKA authentication and key agreement
  • the one or more location servers 168 are illustrated as including a Gateway Mobile Location Center (GMLC) 165 and a Location Management Function (LMF) 166.
  • the one or more location servers 168 may include one or more location/positioning servers, which may include one or more of the GMLC 165, the LMF 166, a position determination entity (PDE), a serving mobile location center (SMLC), a mobile positioning center (MPC), or the like.
  • PDE position determination entity
  • SMLC serving mobile location center
  • MPC mobile positioning center
  • the GMLC 165 and the LMF 166 support UE location services.
  • the GMLC 165 provides an interface for clients/applications (e.g., emergency services) for accessing UE positioning information.
  • the LMF 166 receives measurements and assistance information from the NG-RAN and the UE 104 via the AMF 161 to compute the position of the UE 104.
  • the NG-RAN may utilize one or more positioning methods in order to determine the position of the UE 104.
  • Positioning the UE 104 may involve signal measurements, a position estimate, and an optional velocity computation based on the measurements.
  • the signal measurements may be made by the UE 104 and/or the base station 102 serving the UE 104.
  • the signals measured may be based on one or more of a satellite positioning system (SPS) 170 (e.g., one or more of a Global Navigation Satellite System (GNSS), global position system (GPS), non-terrestrial network (NTN), or other satellite position/location system), LTE signals, wireless local area network (WLAN) signals, Bluetooth signals, a terrestrial beacon system (TBS), sensor-based information (e.g., barometric pressure sensor, motion sensor), NR enhanced cell ID (NRE-CID) methods, NR signals (e.g., multi -round trip time (Multi -RTT), DL angle- of-departure (DL-AoD), DL time difference of arrival (DL-TDOA), UL time difference of arrival (UL-TDOA), and UL angle-of-arrival (UL-AoA) positioning), and/or other systems/signals/sensors.
  • SPS satellite positioning system
  • GNSS Global Navigation Satellite System
  • GPS global position system
  • NTN non-terrestrial network
  • Examples of UEs 104 include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, a tablet, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a healthcare device, an implant, a sensor/actuator, a display, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • Some of the UEs 104 may be referred to as loT devices (e.g., parking meter, gas pump, toaster, vehicles, heart monitor, etc.).
  • the UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • the term UE may also apply to one or more companion devices such as in a device constellation arrangement. One or more of these devices may collectively access the network and/or individually access the network.
  • FIG. 2A is a diagram 200 illustrating an example of a first subframe within a 5G NR frame structure.
  • FIG. 2B is a diagram 230 illustrating an example of DL channels within a 5G NR subframe.
  • FIG. 2C is a diagram 250 illustrating an example of a second subframe within a 5G NR frame structure.
  • FIG. 2D is a diagram 280 illustrating an example of UL channels within a 5G NR subframe.
  • the 5G NR frame structure may be frequency division duplexed (FDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for either DL or UL, or may be time division duplexed (TDD) in which for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated for both DL and UL.
  • FDD frequency division duplexed
  • TDD time division duplexed
  • the 5G NR frame structure is assumed to be TDD, with subframe 4 being configured with slot format 28 (with mostly DL), where D is DL, U is UL, and F is flexible for use between DL/UL, and subframe 3 being configured with slot format 1 (with all UL). While subframes 3, 4 are shown with slot formats 1, 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0, 1 are all DL, UL, respectively. Other slot formats 2-61 include a mix of DL, UL, and flexible symbols.
  • UEs are configured with the slot format (dynamically through DL control information (DCI), or semi- statically/statically through radio resource control (RRC) signaling) through a received slot format indicator (SFI).
  • DCI DL control information
  • RRC radio resource control
  • SFI received slot format indicator
  • FIGs. 2A-2D illustrate a frame structure, and the aspects of the present disclosure may be applicable to other wireless communication technologies, which may have a different frame structure and/or different channels.
  • a frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. Subframes may also include mini-slots, which may include 7, 4, or 2 symbols. Each slot may include 14 or 12 symbols, depending on whether the cyclic prefix (CP) is normal or extended. For normal CP, each slot may include 14 symbols, and for extended CP, each slot may include 12 symbols.
  • the symbols on DL may be CP orthogonal frequency division multiplexing (OFDM) (CP-OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • the slot duration is 0.25 ms
  • the subcarrier spacing is 60 kHz
  • the symbol duration is approximately 16.67 ps.
  • BWPs bandwidth parts
  • Each BWP may have a particular numerology and CP (normal or extended).
  • a resource grid may be used to represent the frame structure.
  • Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends 12 consecutive subcarriers.
  • RB resource block
  • PRBs physical RBs
  • the resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.
  • the RS may include demodulation RS (DM-RS) (indicated as R for one particular configuration, but other DM-RS configurations are possible) and channel state information reference signals (CSI-RS) for channel estimation at the UE.
  • DM-RS demodulation RS
  • CSI-RS channel state information reference signals
  • the RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and phase tracking RS (PT-RS).
  • BRS beam measurement RS
  • BRRS beam refinement RS
  • PT-RS phase tracking RS
  • the physical broadcast channel which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS)/PBCH block (also referred to as SS block (SSB)).
  • the MIB provides a number of RBs in the system bandwidth and a system frame number (SFN).
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and paging messages.
  • SIBs system information blocks
  • some of the REs carry DM-RS (indicated as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the base station.
  • the UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH).
  • the PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH.
  • the PUCCH DM-RS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used.
  • the UE may transmit sounding reference signals (SRS).
  • the SRS may be transmitted in the last symbol of a subframe.
  • the SRS may have a comb structure, and a UE may transmit SRS on one of the combs.
  • the SRS may be used by a base station for channel quality estimation to enable frequencydependent scheduling on the UL.
  • FIG. 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network.
  • IP Internet protocol
  • the controller/processor 375 implements layer 3 and layer 2 functionality.
  • Layer 3 includes a radio resource control (RRC) layer
  • layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • each receiver 354Rx receives a signal through its respective antenna 352.
  • Each receiver 354Rx recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor 356.
  • the TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions.
  • the RX processor 356 may perform spatial processing on the information to recover any spatial streams destined for the UE 350. If multiple spatial streams are destined for the UE 350, they may be combined by the RX processor 356 into a single OFDM symbol stream.
  • the RX processor 356 then converts the OFDM symbol stream from the time-domain to the frequency domain using a Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • the UL transmission is processed at the base station 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • Each receiver 318Rx receives a signal through its respective antenna 320.
  • Each receiver 318Rx recovers information modulated onto an RF carrier and provides the information to a RX processor 370.
  • An increased quantity of transmit antennas (Tx) (e.g., greater than four transmit antennas) are being considered for advanced UEs (e.g., mobile devices, larger-sized devices, etc.), and the support of 8-port transmissions (e.g., uplink transmissions, downlink transmissions, or sidelink transmissions) may improve wireless communication performance.
  • Tx transmit antennas
  • 8-port transmissions e.g., uplink transmissions, downlink transmissions, or sidelink transmissions
  • FIG. 4 illustrates an example UE 400 in communication (e.g., uplink transmission and downlink reception) with a network node 450, as presented herein.
  • the UE 400 may be in communication with a second UE 451, e.g., using sidelink communication.
  • the UE 400 may be similar to the UE 104 of FIG. 1 and/or the UE 350 of FIG. 3.
  • the network node 450 may be similar to the base station 102, or a component of the base station 102, such as the CU 110, the DU 130, and/or the RU 140 of FIG. 1.
  • the example UE 400 may include multiple antenna elements.
  • the example UE 400 includes eight antenna elements (e.g., a first antenna element 402a, a second antenna element 402b, a third antenna element 402c, a fourth antenna element 402d, a fifth antenna element 402e, a sixth antenna element 402f, a seventh antenna element 402g, and an eighth antenna element 402h).
  • the antenna elements may be collectively referred to herein as “antenna elements 402.”
  • An antenna element may be referred to as an antenna, an antenna port, or a port.
  • the example UE 400 is illustrated as having eight antenna elements, in other examples, the UE may include fewer antenna elements or more antenna elements.
  • the antenna elements 402 are located on different parts of the UE 400, thus creating diversity and providing for directional communication.
  • the UE 400 may use at least one of the antenna elements 402 to transmit communication signals (e.g., SRS signals) to enable the network node 450 to estimate an uplink channel.
  • the UE 400 includes a baseband 404 and a transmit path 406 for uplink transmissions using one or more of the antenna elements 402. Aspects of the baseband 404 may be implemented by the TX processor 368 and/or the processor 359 of the UE 350 of FIG. 3.
  • the transmit path 406 includes eight example transmit chains (e.g., a first transmit chain 408a, a second transmit chain 408b, a third transmit chain 408c, a fourth transmit chain 408d, a fifth transmit chain 408e, a sixth transmit chain 408f, a seventh transmit chain 408g, and an eighth transmit chain 408h).
  • a transmit chain may also be referred to as an RF chain.
  • the transmit chains of the UE 400 may be collectively referred to “transmit chains 408” herein.
  • the example UE 400 is illustrated as having eight transmit chains, in other examples, the UE may include fewer transmit chains or more transmit chains.
  • Each transmit chain may be configured to convert a baseband signal to an RF signal for transmission.
  • the UE 400 may support multi-layer uplink transmissions.
  • each layer of the multi-layer uplink transmission is sent to a single antenna element of the antenna elements 402 and there is no combining across layers.
  • certain antenna elements are combined and each layer is sent to multiple ports.
  • a partially-coherent UE may be configured as a partially-coherent 2Tx (PC-2) UE or a partially-coherent 4Tx (PC-4) UE.
  • the eight SRS ports may be mapped to M OFDM symbols in the same slot/sub-slot or in different si ots/sub- slots. If the use of eight SRS ports is for codebook-based 8 Tx PUSCH and the codebook/precoder is an antenna switching scheme, the eight SRS ports may be mapped to M OFDM symbols in the same slot/sub-slot or in different si ots/sub -slots.
  • FIG. 7B is diagram 750 illustrating an example SRS repetition when mapping eight SRS ports to eight OFDM symbols in accordance with various aspects of the present disclosure.
  • mapping of the second group of two SRS ports may be repeated two times (on OFDM symbols S3 and S4). The process may continue until each of the SRS ports and OFDM symbols has been mapped.
  • the UE may sequentially map a first number of SRS ports to a second number of OFDM symbols.
  • the first number and the second number may each be greater than one.
  • the network entity may be a base station, or a component of a base station, in the access network of FIG. 1 or a core network component (e.g., base station 102, 310, 1104; or the network entity 1602 in the hardware implementation of FIG. 16).
  • FIGs. 5A, 5B, 6A, 6B, 7A, 7B, 8A, 8B, 9A, 9B, 10 A, 10B, and 11 illustrate various aspects of the steps in connection with flowchart 1200. For example, referring to FIG.
  • the UE 1102 may, at 1106, sequentially map a first number of SRS ports to a second number of OFDM symbols. In one example, referring to FIG. 6A, the UE may sequentially map eight SRS ports to four OFDM symbols. In another example, referring to FIG. 7B, the UE may sequentially map eight SRS ports to eight OFDM symbols. In some aspects, 1202 may be performed by the SRS mapping component 198.
  • the UE may sequentially map a first number of SRS ports to a second number of OFDM symbols.
  • the first number and the second number may each be greater than one.
  • the network entity may be a base station, or a component of a base station, in the access network of FIG. 1 or a core network component (e.g., base station 102, 310, 1104; or the network entity 1602 in the hardware implementation of FIG. 16).
  • FIGs. 5 A, 5B, 6 A, 6B, 7 A, 7B, 8 A, 8B, 9 A, 9B, 10 A, 10B, and 11 illustrate various aspects of the steps in connection with flowchart 1300. For example, referring to FIG.
  • the first contiguous subset of the OFDM symbols may be contiguous or non-contiguous with the second contiguous subset of the OFDM symbols.
  • the first contiguous subset of the OFDM symbols may be OFDM symbols SI and S2
  • the second contiguous subset of the OFDM symbols may be OFDM symbols S3 and S4.
  • the first contiguous subset of the OFDM symbols (SI and S2) may be contiguous or non-contiguous with the second contiguous subset of the OFDM symbols (S3 and S4).
  • the UE may, based on whether the SRS usage is for codebook-based 8 Tx PUSCH, and a coherency of the codebook/precoder, determine whether to use a partial SRS transmission (e.g., SRS transmission on Ports 0-3 on slot n-2) for a PUSCH transmission.
  • 1308 may be performed by the SRS mapping component 198.
  • the SRS usage of the first number of SRS ports may be for a codebook-based PUSCH, and the first number of SRS ports may include a third number of SRS ports having codebooks that are coherent, and the UE may, at 1310, in response to a drop of at least one SRS port of the first number of SRS ports in communication with a network entity, drop all the first number of SRS ports.
  • the UE 1102 may, at 1114, in response to a drop of at least one SRS port of the first number of SRS ports in communication with a network entity (base station 1104), drop all the first number of SRS ports. For example, as shown in FIG.
  • the network entity may receive a PUSCH transmission based on the SRS.
  • the network entity base station 1104 may receive, at 1120, a PUSCH transmission based on the SRS (received at 1108).
  • 1404 may be performed by the SRS reception component 199.
  • FIG. 15 is a flowchart 1500 illustrating methods of wireless communication at a network entity in accordance with various aspects of the present disclosure.
  • the method may be performed by a network entity.
  • the network entity may be a base station, or a component of a base station, in the access network of FIG. 1 or a core network component (e.g., base station 102, 310, 1104; or the network entity 1602 in the hardware implementation of FIG. 16).
  • the method enables or enhances 8 Tx UL operation to support four and more layers per UE in UL targeting devices.
  • the aspects presented herein improve the efficiency of wireless communication.
  • the network entity may receive an SRS from a first number of SRS ports of a UE and sequentially mapped over a second number of OFDM symbols.
  • the second number may be greater than one.
  • the UE may be the UE 104, 350, 1102, or the apparatus 1604 in the hardware implementation of FIG. 16.
  • FIG. 5 A, 5B, 6 A, 6B, 7 A, 7B, 8 A, 8B, 9 A, 9B, 10 A, 10B, and 11 illustrate various aspects of the steps in connection with flowchart 1500. For example, referring to FIG.
  • the network entity may receive, at 1108, an SRS from a first number of SRS ports of a UE 1102 and sequentially mapped over a second number of OFDM symbols.
  • an SRS from a first number of SRS ports of a UE 1102 and sequentially mapped over a second number of OFDM symbols.
  • eight SRS ports may be mapped to four OFDM symbols (S1-S4).
  • eight SRS ports (SRS ports 1000-1007) may be mapped to eight OFDM symbols (S1-S8).
  • 1502 may be performed by the SRS reception component 199.
  • the network entity may receive a PUSCH transmission based on the SRS.
  • the network entity base station 1104 may receive, at 1120, a PUSCH transmission based on the SRS (received at 1108).
  • 1504 may be performed by the SRS reception component 199.
  • the SRS may be for a codebook-based PUSCH, and a first subset of the SRS ports are coherent and a second subset of the SRS ports may be coherent.
  • the first subset of the SRS ports may be incoherent with the second subset of the SRS ports.
  • the first subset of the SRS ports (SRS ports 1000-1003) may be coherent and the second subset of the SRS ports (SRS ports 1004- 1007) may be coherent.
  • the first subset of the SRS ports (SRS ports 1000-1003) may be incoherent with the second subset of the SRS ports (SRS ports 1004-1007).
  • the first subset of SRS ports may be mapped to a first contiguous subset of the OFDM symbols, and the second SRS ports may be mapped to a second contiguous subset of the OFDM symbols.
  • the first subset of SRS ports (SRS ports 1000-1003) may be mapped to a first contiguous subset of the OFDM symbols (SI, S2), and the second subset of the SRS ports (SRS ports 1004-1007) to a second contiguous subset of the OFDM symbols (S3, S4).
  • the first contiguous subset of the OFDM symbols may be contiguous or non-contiguous with the second subset of the OFDM symbols.
  • the first contiguous subset of the OFDM symbols may be OFDM symbols SI and S2
  • the second contiguous subset of the OFDM symbols may be OFDM symbols S3 and S4.
  • the first contiguous subset of the OFDM symbols (SI and S2) may be contiguous or non-contiguous with the second contiguous subset of the OFDM symbols (S3 and S4).
  • non-coherent SRS ports may be mapped to the second number of OFDM symbols in different slots or different sub-slots.
  • SRS ports 1002 and 1003 may be mapped to OFDM symbol S2, and SRS ports 1004 and 1005 may be mapped to OFDM symbol S3. If SRS ports 1002 and 1003 are non-coherent with SRS ports 1004 and 1005. OFDM symbols S2 and S3 may be in different slots or sub-slots.
  • the usage of the first number of SRS ports may be for codebook-based physical uplink shared channel (PUSCH), and codebooks for the first number of the SRS ports may be for an antenna switching scheme.
  • the first number of SRS ports may be sequentially mapped to the second number of OFDM symbols in contiguous or non-contiguous symbols based on the antenna switching scheme. For example, referring to FIG. 5A, eight SRS ports (SRS ports 1000-1007) may be mapped to two OFDM symbols (SI and S2).
  • the usage of the first number of SRS ports may be for codebook-based PUSCH, and codebooks for the first number of the SRS ports may be for an antenna switching scheme.
  • the first number of SRS ports may be sequentially mapped to the second number of OFDM symbols in the same slot, the same sub-slot, different slots, or different sub-slots based on the antenna switching scheme. For example, referring to FIG. 5A, eight SRS ports (SRS ports 1000-1007) may be mapped to two OFDM symbols (SI and S2).
  • SRS ports 1000-1007 are for codebook-based PUSCH, and codebooks for the eight SRS ports (SRS ports 1000-1007) is for an antenna switching scheme, two OFDM symbols (SI and S2) may be in the same slot, the same sub-slot, different slots, or different sub-slots.
  • the first number of SRS ports may be each mapped to a subset of the second number of OFDM symbols, the subset of the second number of OFDM symbols being based on the second number of OFDM symbols divided by a repetition factor.
  • the mapping from the first number of SRS ports to the subset of the second number of OFDM symbols may be repeated on the second number of OFDM symbols by a time specified by the repetition factor. For example, referring to FIG.
  • the first number (i.e., 8) SRS ports (SRS ports 1000-1007) may first be mapped to a subset of the second number of symbols (i.e., symbols S1-S4).
  • the subset of the second number of symbols may be based on the second number of symbols (i.e., 8) divided by a repetition factor (i.e., 2).
  • the mapping from the first number of SRS ports (SRS ports 1000-1007) to the subset of the second number of OFDM symbols may be repeated on the second number of OFDM symbols by a time specified by the repetition factor (e.g., 2 times).
  • a subset of the first number of SRS ports may be mapped to a single symbol, and the subset is based on a repetition factor. For example, referring to FIG. 7B, when sequentially mapping eight SRS ports (SRS ports 1000-1007) to eight OFDM symbols (S1-S8), assuming a repetition factor of 2, a subset of the first number of SRS ports (SRS ports 1000-1001) may be first mapped to a single symbol (SI). The subset (i.e., 2 SRS ports) may be based on the repetition factor (i.e., 2).
  • the PUSCH may be associated with the most recent SRS resource indicated by an SRI that does not include a skipped transmission of at least one SRS port of the first number of SRS ports.
  • the PUSCH transmission (at slot n+1) may be associated SRS resource 1 transmission at slot n-4.
  • SRS resource 1 is indicated by an SRI at slot n
  • slot n-4 is the most SRS resource 1 transmission that does not include a skipped transmission of at least one SRS port of the first number of SRS ports (SRS ports 0-7).
  • the association of the SRS with the PUSCH transmission may be based on whether at least a part of an SRS transmission has been dropped and based on one or more of an SRS usage, a codebook, or a coherency.
  • the association of the SRS with the PUSCH transmission may be based on whether at least a part of an SRS transmission has been dropped (e.g., whether ports 4-7 has been dropped) and based on whether the SRS usage is for codebookbased 8 Tx PUSCH, and a coherency of the codebook/precoder.
  • FIG. 16 is a diagram 1600 illustrating an example of a hardware implementation for an apparatus 1604.
  • the apparatus 1604 may be a UE, a component of a UE, or may implement UE functionality.
  • the apparatus 1604 may include at least one cellular baseband processor (or processing circuitry) 1624 (also referred to as a modem) coupled to one or more transceivers 1622 (e.g., cellular RF transceiver).
  • the cellular baseband processor(s) (or processing circuitry) 1624 may include at least one on-chip memory (or memory circuitry) 1624'.
  • the apparatus 1604 may further include one or more subscriber identity modules (SIM) cards 1620 and at least one application processor (or processing circuitry) 1606 coupled to a secure digital (SD) card 1608 and a screen 1610.
  • SIM subscriber identity modules
  • SD secure digital
  • the application processor(s) (or processing circuitry) 1606 may include on-chip memory (or memory circuitry) 1606'.
  • the apparatus 1604 may further include a Bluetooth module 1612, a WLAN module 1614, an SPS module 1616 (e.g., GNSS module), one or more sensor modules 1618 (e.g., barometric pressure sensor / altimeter; motion sensor such as inertial measurement unit (IMU), gyroscope, and/or accelerometer(s); light detection and ranging (LIDAR), radio assisted detection and ranging (RADAR), sound navigation and ranging (SONAR), magnetometer, audio and/or other technologies used for positioning), additional memory modules 1626, a power supply 1630, and/or a camera 1632.
  • a Bluetooth module 1612 e.g., a WLAN module 1614
  • SPS module 1616 e.g., GNSS module
  • sensor modules 1618 e.g., barometric pressure sensor / altimeter; motion sensor such as inertial measurement unit (IMU), gyroscope, and/or accelerometer(s); light detection and ranging (LIDAR), radio assisted
  • the Bluetooth module 1612, the WLAN module 1614, and the SPS module 1616 may include an on-chip transceiver (TRX) (or in some cases, just a receiver (RX)).
  • TRX on-chip transceiver
  • the Bluetooth module 1612, the WLAN module 1614, and the SPS module 1616 may include their own dedicated antennas and/or utilize the antennas 1680 for communication.
  • the cellular baseband processor(s) (or processing circuitry) 1624 communicates through the transceiver s) 1622 via one or more antennas 1680 with the UE 104 and/or with an RU associated with a network entity 1602.
  • the software when executed by the cellular baseband processor(s) (or processing circuitry) 1624 / application processor(s) (or processing circuitry) 1606, causes the cellular baseband processor(s) (or processing circuitry) 1624 / application processor(s) (or processing circuitry) 1606 to perform the various functions described supra.
  • the cellular baseband processor(s) (or processing circuitry) 1624 and the application processor(s) (or processing circuitry) 1606 are configured to perform the various functions described supra based at least in part of the information stored in the memory (or memory circuitry).
  • the cellular baseband processor(s) (or processing circuitry) 1624 and the application processor(s) (or processing circuitry) 1606 may be configured to perform a first subset of the various functions described supra without information stored in the memory and may be configured to perform a second subset of the various functions described supra based on the information stored in the memory.
  • the computer-readable medium / memory may also be used for storing data that is manipulated by the cellular baseband processor(s) (or processing circuitry) 1624 / application processor(s) (or processing circuitry) 1606 when executing software.
  • the cellular baseband processor(s) (or processing circuitry) 1624 / application processor(s) (or processing circuitry) 1606 may be a component of the UE 350 and may include the at least one memory 360 and/or at least one of the TX processor 368, the RX processor 356, and the controller/processor 359.
  • the apparatus 1604 may be at least one processor chip (modem and/or application) and include just the cellular baseband processor(s) (or processing circuitry) 1624 and/or the application processor(s) (or processing circuitry) 1606, and in another configuration, the apparatus 1604 may be the entire UE (e.g., see UE 350 of FIG. 3) and include the additional modules of the apparatus 1604.
  • the component 198 may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof.
  • the apparatus 1604 may include a variety of components configured for various functions.
  • the apparatus 1604, and in particular the cellular baseband processor 1624 and/or the application processor 1606, includes means for sequentially mapping a first number of SRS ports to a second number of OFDM symbols, the first number and the second number each being greater than one, and means for transmitting an SRS from the first number of SRS ports over the second number of OFDM symbols based on the mapping.
  • the CU 1710 may include at least one CU processor (or processing circuitry) 1712.
  • the CU processor(s) (or processing circuitry) 1712 may include on-chip memory (or memory circuitry) 1712'.
  • the CU 1710 may further include additional memory modules 1714 and a communications interface 1718.
  • the CU 1710 communicates with the DU 1730 through a midhaul link, such as an Fl interface.
  • the DU 1730 may include at least one DU processor (or processing circuitry) 1732.
  • the DU processor(s) (or processing circuitry) 1732 may include on-chip memory (or memory circuitry) 1732'.
  • the DU 1730 may further include additional memory modules 1734 and a communications interface 1738.
  • the DU 1730 communicates with the RU 1740 through a fronthaul link.
  • the RU 1740 may include at least one RU processor (or processing circuitry) 1742.
  • the RU processor(s) (or processing circuitry) 1742 may include on-chip memory (or memory circuitry) 1742'.
  • the RU 1740 may further include additional memory modules 1744, one or more transceivers 1746, antennas 1780, and a communications interface 1748.
  • the RU 1740 communicates with the UE 104.
  • the on-chip memory (or memory circuitry) 1712', 1732', 1742' and the additional memory modules 1714, 1734, 1744 may each be considered a computer-readable medium / memory (or memory circuitry).
  • the component 199 may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by one or more processors configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by one or more processors, or some combination thereof.
  • the network entity 1702 may include a variety of components configured for various functions. In one configuration, the network entity 1702 includes means for receiving an SRS from a first number of SRS ports of a UE and sequentially mapped over a second number of OFDM symbols, the second number being greater than one, and means for receiving a PUSCH transmission based on the SRS.
  • the network entity 1702 may further include means for performing any of the aspects described in connection with the flowcharts in FIG. 14 and FIG.
  • Combinations such as “at least one of A, B, or C,” “one or more of A, B, or C,” “at least one of A, B, and C,” “one or more of A, B, and C,” and “A, B, C, or any combination thereof’ include any combination of A, B, and/or C, and may include multiples of A, multiples of B, or multiples of C.
  • Aspect 1 is a method of wireless communication at a UE.
  • the method may include sequentially mapping a first number of SRS ports to a second number of OFDM symbols, where the first number and the second number each being greater than one; and transmitting an SRS from the first number of SRS ports over the second number of OFDM symbols based on the mapping.
  • Aspect 2 is the method of aspect 1, where the SRS ports may be based on a codebook, the first subset of the SRS ports may be coherent and the second subset of the SRS ports may be coherent, and the first subset of the SRS ports may be incoherent with the second subset of the SRS ports.
  • Aspect 6 is the method of any of aspects 1 to 2, where sequentially mapping the first number of SRS ports to the second number of OFDM symbols may further include: mapping non-coherent SRS port groups in the first number of SRS ports to different slots or sub -slots.
  • Aspect 10 is the method of any of aspects 1 to 2, where the sequentially mapping may include mapping a subset of the first number of SRS ports to a single symbol. The subset may be based on a repetition factor.
  • Aspect 12 is the method of any of aspects 1 to 10, where the method may further include determining whether to use a partial SRS transmission for a PUSCH transmission based on one or more of SRS usage, a codebook, or a coherency.
  • Aspect 18 is the apparatus for wireless communication at a UE, comprising means for performing each step in the method of any of aspects 1-15.
  • Aspect 19 is an apparatus of any of aspects 16-18, further comprising a transceiver configured to receive or to transmit in association with the method of any of aspects 1-15.
  • Aspect 20 is a computer-readable medium (e.g., a non-transitory computer-readable medium) storing computer executable code at a UE, the code when executed by at least one processor causes the at least one processor to, individually or in any combination, perform the method of any of aspects 1-15.
  • a computer-readable medium e.g., a non-transitory computer-readable medium
  • Aspect 21 is a method of wireless communication at a network entity.
  • the method may include receiving an SRS from a first number of SRS ports of a UE and sequentially mapped over a second number of OFDM symbols, where the second number is greater than one; and receiving a PUSCH transmission based on the SRS.
  • Aspect 22 is the method of aspect 21, where the SRS may be for a codebook-based PUSCH, and a first subset of the SRS ports are coherent and a second subset of the SRS ports are coherent. The first subset of the SRS ports may be incoherent with the second subset of the SRS ports.
  • Aspect 23 is the method of aspect 22, where the first subset of SRS ports may be mapped to a first contiguous subset of the OFDM symbols, and the second SRS ports may be mapped to a second contiguous subset of the OFDM symbols.
  • Aspect 24 is the method of aspect 23, where the first contiguous subset of the OFDM symbols may be contiguous or non-contiguous with the second subset of the OFDM symbols.
  • Aspect 37 is a computer-readable medium (e.g., a non-transitory computer-readable medium) storing computer executable code at a network entity, the code when executed by at least one processor causes the at least one processor to, individually or in any combination, perform the method of any of aspects 21-32.
  • a computer-readable medium e.g., a non-transitory computer-readable medium

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Abstract

L'invention propose un procédé de communication sans fil au niveau d'un équipement utilisateur (UE) et un appareil associé. Dans le procédé, l'UE mappe séquentiellement un premier nombre de ports de signal de référence de sondage (SRS) à un second nombre de symboles de multiplexage par répartition orthogonale de la fréquence (OFDM). Le premier nombre et le second nombre sont supérieurs à un. L'UE transmet en outre un SRS à partir du premier nombre de ports de SRS sur le second nombre de symboles OFDM sur la base du mappage.
PCT/US2023/081393 2023-01-04 2023-11-28 Détails pour mappage de srs sur 8 ports à de multiples symboles ofdm WO2024147863A1 (fr)

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US18/520,038 US20240223338A1 (en) 2023-01-04 2023-11-27 Details for 8 ports srs mapping to multiple ofdm symbols
US18/520,038 2023-11-27

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