WO2023164378A1 - Atténuation d'interférence améliorée pour signal de référence de sondage - Google Patents

Atténuation d'interférence améliorée pour signal de référence de sondage Download PDF

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Publication number
WO2023164378A1
WO2023164378A1 PCT/US2023/062480 US2023062480W WO2023164378A1 WO 2023164378 A1 WO2023164378 A1 WO 2023164378A1 US 2023062480 W US2023062480 W US 2023062480W WO 2023164378 A1 WO2023164378 A1 WO 2023164378A1
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WIPO (PCT)
Prior art keywords
srs resource
srs
sequence
configuration
index value
Prior art date
Application number
PCT/US2023/062480
Other languages
English (en)
Inventor
Yitao Chen
Mostafa KHOSHNEVISAN
Xiaoxia Zhang
Jing Sun
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 US18/167,621 external-priority patent/US20230275737A1/en
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Publication of WO2023164378A1 publication Critical patent/WO2023164378A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • 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
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • 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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation

Definitions

  • aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for enhanced interference mitigation for sounding reference signal (SRS).
  • SRS sounding reference signal
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, or the like).
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC- FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE).
  • LTE/LTE- Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).
  • UMTS Universal Mobile Telecommunications System
  • a wireless network may include one or more network nodes that support communication for wireless communication devices, such as a user equipment (UE) or multiple UEs.
  • a UE may communicate with a network node via downlink communications and uplink communications.
  • Downlink (or “DL”) refers to a communication link from the network node to the UE
  • uplink (or “UL”) refers to a communication link from the UE to the network node.
  • Some wireless networks may support device-to-device communication, such as via a local link (e g., a sidelink (SL), a wireless local area network (WLAN) link, and/or a wireless personal area network (WPAN) link, among other examples).
  • SL sidelink
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • New Radio which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the 3GPP.
  • NR is designed to better support mobile broadband internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and/or single-carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, as well as supporting beamforming, multiple -input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM single-carrier frequency division multiplexing
  • MIMO multiple -input multiple-output
  • the UE may include a memory and one or more processors coupled to the memory.
  • the one or more processors may be configured to receive a configuration of a sounding reference signal (SRS) resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the one or more processors may be configured to transmit an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • SRS sounding reference signal
  • the network entity may include a memory and one or more processors coupled to the memory.
  • the one or more processors may be configured to transmit a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the one or more processors may be configured to receive an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the method may include receiving a configuration of an SRS resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the method may include transmitting an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the method may include transmitting a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the method may include receiving an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to receive a configuration of an SRS resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to transmit an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network entity.
  • the set of instructions when executed by one or more processors of the network entity, may cause the network entity to transmit a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the set of instructions when executed by one or more processors of the network entity, may cause the network entity to receive an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the apparatus may include means for transmitting a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the apparatus may include means for receiving an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the UE may include a memory and one or more processors coupled to the memory.
  • the one or more processors may be configured to receive a configuration of parameters for an SRS resource of an SRS resource set.
  • the one or more processors may be configured to receive a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the one or more processors may be configured to transmit an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • the network entity may include a memory and one or more processors coupled to the memory.
  • the one or more processors may be configured to transmit a configuration of parameters for an SRS resource of an SRS resource set for a UE.
  • the one or more processors may be configured to transmit a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the one or more processors may be configured to receive an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • the method may include receiving a configuration of parameters for an SRS resource of an SRS resource set.
  • the method may include receiving a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the method may include transmitting an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • the method may include transmitting a configuration of parameters for an SRS resource of an SRS resource set for a UE.
  • the method may include transmitting a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the method may include receiving an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to receive a configuration of parameters for an SRS resource of an SRS resource set.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to receive a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the set of instructions when executed by one or more processors of the UE, may cause the UE to transmit an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network entity.
  • the set of instructions when executed by one or more processors of the network entity, may cause the network entity to transmit a configuration of parameters for an SRS resource of an SRS resource set for a UE.
  • the set of instructions when executed by one or more processors of the network entity, may cause the network entity to transmit a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the set of instructions when executed by one or more processors of the network entity, may cause the network entity to receive an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • the apparatus may include means for receiving a configuration of parameters for an SRS resource of an SRS resource set.
  • the apparatus may include means for receiving a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the apparatus may include means for transmitting an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • the apparatus may include means for transmitting a configuration of parameters for an SRS resource of an SRS resource set for a UE.
  • the apparatus may include means for transmitting a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the apparatus may include means for receiving an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, network entity, network node, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
  • aspects are described in the present disclosure by illustration to some examples, those skilled in the art will understand that such aspects may be implemented in many different arrangements and scenarios.
  • Techniques described herein may be implemented using different platform types, devices, systems, shapes, sizes, and/or packaging arrangements.
  • some aspects may be implemented via integrated chip embodiments or other non-modulecomponent based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, and/or artificial intelligence devices).
  • Aspects may be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, and/or system-level components.
  • Devices incorporating described aspects and features may include additional components and features for implementation and practice of claimed and described aspects.
  • transmission and reception of wireless signals may include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, and/or summers).
  • RF radio frequency
  • aspects described herein may be practiced in a wide variety of devices, components, systems, distributed arrangements, and/or end-user devices of varying size, shape, and constitution.
  • Fig. 1 is a diagram illustrating an example of a wireless network, in accordance with the present disclosure.
  • FIG. 2 is a diagram illustrating an example of a base station in communication with a user equipment (UE) in a wireless network, in accordance with the present disclosure.
  • UE user equipment
  • FIG. 3 is a diagram illustrating an example disaggregated base station architecture, in accordance with the present disclosure.
  • Fig. 4 is a diagram illustrating an example of physical channels and reference signals in a wireless network, in accordance with the present disclosure.
  • Fig. 5 is a diagram illustrating an example of sounding reference signal (SRS) resource sets, in accordance with the present disclosure.
  • SRS sounding reference signal
  • FIGs. 6-7 are diagrams illustrating examples associated with enhanced interference mitigation for SRS, in accordance with the present disclosure.
  • FIGs. 8-11 are diagrams illustrating example processes associated with enhanced interference mitigation for SRS, in accordance with the present disclosure.
  • FIGs. 12-13 are diagrams of example apparatuses for wireless communication, in accordance with the present disclosure.
  • aspects may be described herein using terminology commonly associated with a 5G or New Radio (NR) radio access technology (RAT), aspects of the present disclosure can be applied to other RATs, such as a 3G RAT, a 4G RAT, and/or a RAT subsequent to 5G (e.g., 6G).
  • NR New Radio
  • Fig. 1 is a diagram illustrating an example of a wireless network 100, in accordance with the present disclosure.
  • the wireless network 100 may be or may include elements of a 5G (e.g., NR) network and/or a 4G (e g., Long Term Evolution (LTE)) network, among other examples.
  • 5G e.g., NR
  • 4G e g., Long Term Evolution (LTE) network
  • the wireless network 100 may include one or more base stations 110 (shown as a BS 110a, a BS 110b, a BS 110c, and a BS 1 lOd), a user equipment (UE) 120 or multiple UEs 120 (shown as a UE 120a, a UE 120b, a UE 120c, a UE 120d, and a UE 120e), and/or other network entities.
  • a base station 110 is an entity that communicates with UEs 120.
  • a base station 110 may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, and/or a transmission reception point (TRP).
  • Each base station 110 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a base station 110 and/or a base station subsystem serving this coverage area, depending on the context in which the term is used.
  • a base station 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 120 with service subscriptions.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs 120 with service subscriptions.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs 120 having association with the femto cell (e.g., UEs 120 in a closed subscriber group (CSG)).
  • CSG closed subscriber group
  • a base station 110 for a macro cell may be referred to as a macro base station.
  • a base station 110 for a pico cell may be referred to as a pico base station.
  • a base station 110 for a femto cell may be referred to as a femto base station or an in-home base station.
  • the BS 110a may be a macro base station for a macro cell 102a
  • the BS 110b may be a pico base station for a pico cell 102b
  • the BS 110c may be a femto base station for a femto cell 102c.
  • a base station may support one or multiple (e.g., three) cells.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a base station 110 that is mobile (e.g., a mobile base station).
  • the base stations 110 may be interconnected to one another and/or to one or more other base stations 110 or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as a direct physical connection or a virtual network, using any suitable transport network.
  • the wireless network 100 may include one or more relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a base station 110 or a UE 120) and send a transmission of the data to a downstream station (e.g., a UE 120 or a base station 110).
  • a relay station may be a UE 120 that can relay transmissions for other UEs 120.
  • the BS 1 lOd e.g., a relay base station
  • the BS 110a e.g., a macro base station
  • a base station 110 that relays communications may be referred to as a relay station, a relay base station, a relay network node, a relay node, a relay, or the like.
  • the wireless network 100 may be a heterogeneous network that includes base stations 110 of different types, such as macro base stations, pico base stations, femto base stations, relay base stations, or the like. These different types of base stations 110 may have different transmit power levels, different coverage areas, and/or different impacts on interference in the wireless network 100.
  • macro base stations may have a high transmit power level (e.g., 5 to 40 watts) whereas pico base stations, femto base stations, and relay base stations may have lower transmit power levels (e.g., 0.1 to 2 watts).
  • a network controller 130 may couple to or communicate with a set of base stations 110 and may provide coordination and control for these base stations 110.
  • the network controller 130 may communicate with the base stations 110 via a backhaul communication link or a midhaul communication link.
  • the base stations 110 may communicate with one another directly or indirectly via a wireless or wireline backhaul communication link.
  • the network controller 130 may be a central or centralized unit (CU) or a core network device, or may include a CU or a core network device.
  • the UEs 120 may be dispersed throughout the wireless network 100, and each UE 120 may be stationary or mobile.
  • a UE 120 may include, for example, an access terminal, a terminal, a mobile station, and/or a subscriber unit.
  • a UE 120 may be a cellular phone (e g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or a smart bracelet)), an entertainment device (e.g., a music device, a video device, and/or a satellite radio), a vehicular component or sensor,
  • Some UEs 120 may be considered machine-type communication (MTC) or evolved or enhanced machine-type communication (eMTC) UEs.
  • An MTC UE and/or an eMTC UE may include, for example, a robot, a drone, a remote device, a sensor, a meter, a monitor, and/or a location tag, that may communicate with a base station, another device (e.g., a remote device), or some other entity.
  • Some UEs 120 may be considered Intemet-of-Things (loT) devices, and/or may be implemented as NB-IoT (narrowband loT) devices.
  • Some UEs 120 may be considered a Customer Premises Equipment.
  • a UE 120 may be included inside a housing that houses components of the UE 120, such as processor components and/or memory components.
  • the processor components and the memory components may be coupled together.
  • the processor components e.g., one or more processors
  • the memory components e.g., a memory
  • the processor components and the memory components may be operatively coupled, communicatively coupled, electronically coupled, and/or electrically coupled.
  • any number of wireless networks 100 may be deployed in a given geographic area.
  • Each wireless network 100 may support a particular RAT and may operate on one or more frequencies.
  • a RAT may be referred to as a radio technology, an air interface, or the like.
  • a frequency may be referred to as a carrier, a frequency channel, or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another).
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to- vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, or a vehicle-to-pedestrian (V2P) protocol), and/or a mesh network.
  • V2X vehicle-to-everything
  • a UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Devices of the wireless network 100 may communicate using the electromagnetic spectrum, which may be subdivided by frequency or wavelength into various classes, bands, channels, or the like. For example, devices of the wireless network 100 may communicate using one or more operating bands.
  • 5G NR two initial operating bands have been identified as frequency range designations FR1 (410 MHz - 7.125 GHz) and FR2 (24.25 GHz - 52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles.
  • 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
  • FR3 7. 125 GHz - 24.25 GHz
  • FR3 7. 125 GHz - 24.25 GHz
  • Frequency bands falling within FR3 may inherit FR1 characteristics and/or FR2 characteristics, and thus may effectively extend features of FR1 and/or FR2 into mid-band frequencies.
  • higher frequency bands are currently being explored to extend 5G NR operation beyond 52.6 GHz.
  • FR4a or FR4-1 52.6 GHz - 71 GHz
  • FR4 52.6 GHz - 114.25 GHz
  • FR5 114.25 GHz - 300 GHz.
  • Each of these higher frequency bands falls within the EHF band.
  • sub-6 GHz may broadly represent frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies.
  • millimeter wave may broadly represent frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and/or FR5, or may be within the EHF band.
  • frequencies included in these operating bands may be modified, and techniques described herein are applicable to those modified frequency ranges.
  • the UE 120 may include a communication manager 140.
  • the communication manager 140 may receive a configuration of a sounding reference signal (SRS) resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping; and transmit an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • SRS sounding reference signal
  • the communication manager 140 may perform one or more other operations described herein.
  • the communication manager 140 may receive a configuration of parameters for an SRS resource of an SRS resource set; receive a dynamic indication of an updated value for at least one of the parameters for the SRS resource; and transmit an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource. Additionally, or alternatively, the communication manager 140 may perform one or more other operations described herein.
  • a network entity may include a communication manager 150.
  • the communication manager 150 may transmit a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping; and receive an SRS in the SRS resource in accordance with the configuration of the SRS resource. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
  • the communication manager 150 may transmit a configuration of parameters for an SRS resource of an SRS resource set for a UE; transmit a dynamic indication of an updated value for at least one of the parameters for the SRS resource; and receive an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 is a diagram illustrating an example 200 of a base station 110 in communication with a UE 120 in a wireless network 100, in accordance with the present disclosure.
  • the base station 110 may be equipped with a set of antennas 234a through 234t, such as T antennas (T> 1).
  • the UE 120 may be equipped with a set of antennas 252a through 252r, such as R antennas (A > 1).
  • a transmit processor 220 may receive data, from a data source 212, intended for the UE 120 (or a set of UEs 120).
  • the transmit processor 220 may select one or more modulation and coding schemes (MCSs) for the UE 120 based at least in part on one or more channel quality indicators (CQIs) received from that UE 120.
  • MCSs modulation and coding schemes
  • CQIs channel quality indicators
  • the base station 110 may process (e.g., encode and modulate) the data for the UE 120 based at least in part on the MCS(s) selected for the UE 120 and may provide data symbols for the UE 120.
  • the transmit processor 220 may process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and/or upper layer signaling) and provide overhead symbols and control symbols.
  • the transmit processor 220 may generate reference symbols for reference signals (e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)) and synchronization signals (e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)).
  • reference signals e.g., a cell-specific reference signal (CRS) or a demodulation reference signal (DMRS)
  • synchronization signals e.g., a primary synchronization signal (PSS) or a secondary synchronization signal (SSS)
  • a transmit (TX) multiple -input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems), shown as modems 232a through 232t.
  • each output symbol stream may be provided to a modulator component (shown as MOD) of a modem 232.
  • Each modem 232 may use a respective modulator component to process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream.
  • Each modem 232 may further use a respective modulator component to process (e.g., convert to analog, amplify, fdter, and/or upconvert) the output sample stream to obtain a downlink signal.
  • the modems 232a through 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas), shown as antennas 234a through 234t.
  • a set of antennas 252 may receive the downlink signals from the base station 110 and/or other base stations 110 and may provide a set of received signals (e.g., R received signals) to a set of modems 254 (e.g., R modems), shown as modems 254a through 254r.
  • R received signals e.g., R received signals
  • each received signal may be provided to a demodulator component (shown as DEMOD) of a modem 254.
  • DEMOD demodulator component
  • Each modem 254 may use a respective demodulator component to condition (e.g., fdter, amplify, downconvert, and/or digitize) a received signal to obtain input samples.
  • Each modem 254 may use a demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols.
  • a M1M0 detector 256 may obtain received symbols from the modems 254, may perform MIMO detection on the received symbols if applicable, and may provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data for the UE 120 to a data sink 260, and may provide decoded control information and system information to a controller/processor 280.
  • controller/processor may refer to one or more controllers, one or more processors, or a combination thereof.
  • a channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and/or a CQf parameter, among other examples.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSSRQ reference signal received quality
  • CQf CQf parameter
  • the network controller 130 may include a communication unit 294, a controller/processor 290, and a memory 292.
  • the network controller 130 may include, for example, one or more devices in a core network.
  • the network controller 130 may communicate with the base station 110 via the communication unit 294.
  • One or more antennas may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, and/or one or more antenna arrays, among other examples.
  • An antenna panel, an antenna group, a set of antenna elements, and/or an antenna array may include one or more antenna elements (within a single housing or multiple housings), a set of coplanar antenna elements, a set of non-coplanar antenna elements, and/or one or more antenna elements coupled to one or more transmission and/or reception components, such as one or more components of Fig. 2.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports that include RSRP, RSSI, RSRQ, and/or CQI) from the controller/processor 280.
  • the transmit processor 264 may generate reference symbols for one or more reference signals.
  • the symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by the modems 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110.
  • the modem 254 of the UE 120 may include a modulator and a demodulator.
  • the uplink signals from UE 120 and/or other UEs may be received by the antennas 234, processed by the modem 232 (e.g., a demodulator component, shown as DEMOD, of the modem 232), detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 238 may provide the decoded data to a data sink 239 and provide the decoded control information to the controller/processor 240.
  • the base station 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244.
  • the base station 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and/or uplink communications.
  • the modem 232 of the base station 110 may include a modulator and a demodulator.
  • the base station 110 includes a transceiver.
  • the transceiver may include any combination of the antenna(s) 234, the modem(s) 232, the MIMO detector 236, the receive processor 238, the transmit processor 220, and/or the TX MIMO processor 230.
  • the transceiver may be used by a processor (e.g., the controller/processor 240) and the memory 242 to perform aspects of any of the methods described herein (e.g., with reference to Figs. 6-13).
  • the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component(s) of Fig. 2 may perform one or more techniques associated with enhanced interference mitigation for SRS, as described in more detail elsewhere herein.
  • the controller/processor 240 of the base station 110, the controller/processor 280 of the UE 120, and/or any other component(s) of Fig. 2 may perform or direct operations of, for example, process 800 of Fig. 8, process 900 of Fig. 9, process 1000 of Fig. 10, process 1100 of Fig. 11, and/or other processes as described herein.
  • the memory 242 and the memory 282 may store data and program codes for the base station 110 and the UE 120, respectively.
  • the memory 242 and/or the memory 282 may include anon- transitory computer-readable medium storing one or more instructions (e.g., code and/or program code) for wireless communication.
  • the one or more instructions when executed (e.g., directly, or after compiling, converting, and/or interpreting) by one or more processors of the base station 110 and/or the UE 120, may cause the one or more processors, the UE 120, and/or the base station 110 to perform or direct operations of, for example, process 800 ofFig. 8, process 900 of Fig. 9, process 1000 ofFig. 10, process 1100 of Fig. 11, and/or other processes as described herein.
  • executing instructions may include running the instructions, converting the instructions, compiling the instructions, and/or interpreting the instructions, among other examples.
  • a network entity described herein is the base station 110, is included in the base station 110, or includes one or more components of the base station 110 shown in Fig. 2.
  • the UE 120 includes means for receiving a configuration of an SRS resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping; and/or means for transmitting an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the means for the UE 120 to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller/processor 280, or memory 282.
  • the UE 120 includes means for receiving a configuration of parameters for an SRS resource of an SRS resource set; means for receiving a dynamic indication of an updated value for at least one of the parameters for the SRS resource; and/or means for transmitting an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • the means for the UE 120 to perform operations described herein may include, for example, one or more of communication manager 140, antenna 252, modem 254, MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller/processor 280, or memory 282.
  • a network entity includes means for transmitting a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping; and/or means for receiving an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the means for the network entity to perform operations described herein may include, for example, one or more of communication manager 150, transmit processor 220, TX MIMO processor 230, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller/processor 240, memory 242, or scheduler 246.
  • the network entity includes means for transmitting a configuration of parameters for an SRS resource of an SRS resource set for a UE; means for transmitting a dynamic indication of an updated value for at least one of the parameters for the SRS resource; and/or means for receiving an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • the means for the network entity to perform operations described herein may include, for example, one or more of communication manager 150, transmit processor 220, TX MIMO processor 230, modem 232, antenna 234, MIMO detector 236, receive processor 238, controller/processor 240, memory 242, or scheduler 246.
  • Fig. 2 is illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, or combination component or in various combinations of components.
  • the functions described with respect to the transmit processor 264, the receive processor 258, and/or the TX MIMO processor 266 may be performed by or under the control of the controller/processor 280.
  • Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig 2.
  • a network node may be implemented in an aggregated or disaggregated architecture.
  • RAN radio access network
  • a base station such as a Node B (NB), an evolved NB (eNB), an NR base station, a 5G NB, an access point (AP), a TRP, or a cell, among other examples
  • a base station may be implemented as an aggregated base station (also known as a standalone base station or a monolithic base station) or a disaggregated base station.
  • Network entity or “network node” may refer to a disaggregated base station, or to one or more units of a disaggregated base station (such as one or more CUs, one or more DUs, one or more RUs, or a combination thereof).
  • An aggregated base station may be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit).
  • a disaggregated base station e g., a disaggregated network node
  • a CU may be implemented within a network node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed throughout one or multiple other network nodes.
  • the DUs may be implemented to communicate with one or more RUs.
  • Each of the CU, DU, and RU also can be implemented as virtual units, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), among other examples.
  • VCU virtual central unit
  • VDU virtual distributed unit
  • VRU virtual radio unit
  • Base station-type operation or network design may consider aggregation characteristics of base station functionality.
  • disaggregated base stations may be utilized in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (such as the network configuration sponsored by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)) to facilitate scaling of communication systems by separating base station functionality into one or more units that can be individually deployed.
  • a disaggregated base station may include functionality implemented across two or more units at various physical locations, as well as functionality implemented for at least one unit virtually, which can enable flexibility in network design.
  • the various units of the disaggregated base station can be configured for wired or wireless communication with at least one other unit of the disaggregated base station.
  • Fig. 3 is a diagram illustrating an example disaggregated base station architecture 300, in accordance with the present disclosure.
  • the disaggregated base station architecture 300 may include a CU 310 that can communicate directly with a core network 320 via a backhaul link, or indirectly with the core network 320 through one or more disaggregated control units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 325 via an E2 link, or a Non-Real Time (Non-RT) RIC 315 associated with a Service Management and Orchestration (SMO) Framework 305, or both).
  • a CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as through Fl interfaces.
  • Each of the DUs 330 may communicate with one or more RUs 340 via respective fronthaul links.
  • Each of the RUs 340 may communicate with one or more UEs 120 via respective radio frequency (RF) access links.
  • RF radio frequency
  • a UE 120 may be simultaneously served by multiple RUs 340.
  • Each of the units may include one or more interfaces or be coupled with 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 units, or an associated processor or controller providing instructions to one or multiple communication interfaces of the respective unit, can be configured to communicate with one or more of the other units via the transmission medium.
  • each of the units can include a wired interface, configured to receive or transmit signals over a wired transmission medium to one or more of the other units, and a wireless interface, which may include a receiver, a transmitter or transceiver (such as an RF transceiver), configured to receive or 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 transceiver (such as an RF transceiver), configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.
  • the CU 310 may host one or more higher layer control functions.
  • control functions can include radio resource control (RRC) functions, packet data convergence protocol (PDCP) functions, or service data adaptation protocol (SDAP) functions, among other examples.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • SDAP service data adaptation protocol
  • Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 310.
  • the CU 310 may be configured to handle user plane functionality (for example, Central Unit - User Plane (CU-UP) functionality), control plane functionality (for example, Central Unit - Control Plane (CU-CP) functionality), or a combination thereof.
  • the CU 310 can be logically split into one or more CU-UP units and one or more CU-CP units.
  • a CU-UP unit can communicate bidirectionally with a CU-CP unit via an interface, such as the El interface when implemented in an O-RAN configuration.
  • the CU 310 can be implemented to communicate with a DU 330, as necessary, for network control and signaling.
  • Each DU 330 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 340.
  • the DU 330 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 depending, at least in part, on a functional split, such as a functional split defined by the 3 GPP.
  • the one or more high PHY layers may be implemented by one or more modules for forward error correction (FEC) encoding and decoding, scrambling, and modulation and demodulation, among other examples.
  • FEC forward error correction
  • the DU 330 may further host one or more low PHY layers, such as implemented by one or more modules for a fast Fourier transform (FFT), an inverse FFT (iFFT), digital beamforming, or physical random access channel (PRACH) extraction and filtering, among other examples.
  • FFT fast Fourier transform
  • iFFT inverse FFT
  • PRACH physical random access channel
  • Each layer (which also may be referred to as a module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 330, or with the control functions hosted by the CU 310.
  • Each RU 340 may implement lower-layer functionality.
  • an RU 340, controlled by a DU 330 may correspond to a logical node that hosts RF processing functions or low-PHY layer functions, such as performing an FFT, performing an iFFT, digital beamforming, or PRACH extraction and filtering, among other examples, based on a functional split (for example, a functional split defined by the 3GPP), such as a lower layer functional split.
  • a functional split for example, a functional split defined by the 3GPP
  • each RU 340 can be operated to handle over the air (OTA) communication with one or more UEs 120.
  • OTA over the air
  • the SMO Framework 305 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 305 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface (such as an 01 interface).
  • the SMO Framework 305 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 390) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an 02 interface).
  • a cloud computing platform such as an open cloud (O-Cloud) platform 390
  • network element life cycle management such as to instantiate virtualized network elements
  • cloud computing platform interface such as an 02 interface
  • virtualized network elements can include, but are not limited to, CUs 310, DUs 330, RUs 340, non-RT RICs 315, and Near-RT RICs 325.
  • the SMO Framework 305 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 311, via an 01 interface.
  • OF-eNB open eNB
  • the SMO Framework 305 can communicate directly with each of one or more RUs 340 via a respective 01 interface.
  • the SMO Framework 305 also may include a Non-RT RIC 315 configured to support functionality of the SMO Framework 305.
  • the Non-RT RIC 315 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, Artificial Intelligence/Machine Learning (AI/ML) workflows including model training and updates, or policy-based guidance of applications/features in the Near-RT RIC 325.
  • the Non-RT RIC 315 may be coupled to or communicate with (such as via an Al interface) the Near-RT RIC 325.
  • the Near-RT RIC 325 may be configured to include a logical function that enables near-realtime 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 310, one or more DUs 330, or both, as well as an O-eNB, with the Near-RT RIC 325.
  • the Non-RT RIC 315 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 325 and may be received at the SMO Framework 305 or the Non-RT RIC 315 from non-network data sources or from network functions.
  • the Non-RT RIC 315 or the Near-RT RIC 325 may be configured to tune RAN behavior or performance.
  • the Non-RT RIC 315 may monitor long-term trends and patterns for performance and employ AI/ML models to perform corrective actions through the SMO Framework 305 (such as reconfiguration via an 01 interface) or via creation of RAN management policies (such as Al interface policies).
  • Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
  • Fig. 4 is a diagram illustrating an example 400 of physical channels and reference signals in a wireless network, in accordance with the present disclosure.
  • downlink channels and downlink reference signals may carry information from a base station 110 to a UE 120
  • uplink channels and uplink reference signals may carry information from a UE 120 to a base station 110.
  • a downlink channel may include a physical downlink control channel (PDCCH) that carries downlink control information (DCI), a physical downlink shared channel (PDSCH) that carries downlink data, or a physical broadcast channel (PBCH) that carries system information, among other examples.
  • PDSCH communications may be scheduled by PDCCH communications.
  • an uplink channel may include a physical uplink control channel (PUCCH) that carries uplink control information (UCI), a physical uplink shared channel (PUSCH) that carries uplink data, or a PRACH used for initial network access, among other examples.
  • the UE 120 may transmit acknowledgement (ACK) or negative acknowledgement (NACK) feedback (e.g., ACK/NACK feedback or ACK/NACK information) in UCI on the PUCCH and/or the PUSCH.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • a downlink reference signal may include a synchronization signal block (SSB), a channel state information (CSI) reference signal (CSI-RS), a DMRS, a positioning reference signal (PRS), or a phase tracking reference signal (PTRS), among other examples.
  • CSI-RS channel state information reference signal
  • DMRS DMRS
  • PRS positioning reference signal
  • PTRS phase tracking reference signal
  • an uplink reference signal may include an SRS, a DMRS, or a PTRS, among other examples.
  • An SSB may carry information used for initial network acquisition and synchronization, such as a PSS, an SSS, a PBCH, and a PBCH DMRS.
  • An SSB is sometimes referred to as a synchronization signal/PBCH (SS/PBCH) block.
  • the base station 110 may transmit multiple SSBs on multiple corresponding beams, and the SSBs may be used for beam selection.
  • a CSI-RS may carry information used for downlink channel estimation (e g., downlink CSI acquisition), which may be used for scheduling, link adaptation, or beam management, among other examples.
  • the base station 110 may configure a set of CSI-RSs for the UE 120, and the UE 120 may measure the configured set of CSI-RSs. Based at least in part on the measurements, the UE 120 may perform channel estimation and may report channel estimation parameters to the base station 110 (e.g., in a CSI report), such as a CQI, a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a layer indicator (LI), a rank indicator (RI), or an RSRP, among other examples.
  • PMI precoding matrix indicator
  • CRI layer indicator
  • RI rank indicator
  • RSRP rank indicator
  • the base station 110 may use the CSI report to select transmission parameters for downlink communications to the UE 120, such as a number of transmission layers (e.g., a rank), a precoding matrix (e.g., a precoder), an MCS, or a refined downlink beam (e.g., using a beam refinement procedure or a beam management procedure), among other examples.
  • a number of transmission layers e.g., a rank
  • a precoding matrix e.g., a precoder
  • MCS mobility control channel quality control
  • a refined downlink beam e.g., using a beam refinement procedure or a beam management procedure
  • a DMRS may carry information used to estimate a radio channel for demodulation of an associated physical channel (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH).
  • the design and mapping of a DMRS may be specific to a physical channel for which the DMRS is used for estimation.
  • DMRSs are UE-specific, can be beamformed, can be confined in a scheduled resource (e.g., rather than transmitted on a wideband), and can be transmitted only when necessary. As shown, DMRSs are used for both downlink communications and uplink communications.
  • a PTRS may carry information used to compensate for oscillator phase noise.
  • the phase noise increases as the oscillator carrier frequency increases.
  • PTRS can be utilized at high carrier frequencies, such as millimeter wave frequencies, to mitigate phase noise.
  • the PTRS may be used to track the phase of the local oscillator and to enable suppression of phase noise and common phase error (CPE).
  • CPE common phase error
  • PTRSs are used for both downlink communications (e.g., on the PDSCH) and uplink communications (e.g., on the PUSCH).
  • a PRS may carry information used to enable timing or ranging measurements of the UE 120 based on signals transmitted by the base station 110 to improve observed time difference of arrival (OTDOA) positioning performance.
  • a PRS may be a pseudorandom Quadrature Phase Shift Keying (QPSK) sequence mapped in diagonal patterns with shifts in frequency and time to avoid collision with cell-specific reference signals and control channels (e.g., a PDCCH).
  • QPSK Quadrature Phase Shift Keying
  • a PRS may be designed to improve detectability by the UE 120, which may need to detect downlink signals from multiple neighboring base stations in order to perform OTDOA -based positioning.
  • the UE 120 may receive a PRS from multiple cells (e.g., a reference cell and one or more neighbor cells), and may report a reference signal time difference (RSTD) based on OTDOA measurements associated with the PRSs received from the multiple cells.
  • RSTD reference signal time difference
  • the base station 110 may then calculate a position of the UE 120 based on the RSTD measurements reported by the UE 120.
  • An SRS may carry information used for uplink channel estimation, which may be used for scheduling, link adaptation, precoder selection, or beam management, among other examples.
  • the base station 110 may configure one or more SRS resource sets for the UE 120, and the UE 120 may transmit SRSs on the configured SRS resource sets.
  • An SRS resource set may have a configured usage, such as uplink CSI acquisition, downlink CSI acquisition for reciprocity-based operations, uplink beam management, among other examples.
  • the base station 110 may measure the SRSs, may perform channel estimation based at least in part on the measurements, and may use the SRS measurements to configure communications with the UE 120.
  • Fig. 4 is provided as an example. Other examples may differ from what is described with regard to Fig. 4.
  • Fig. 5 is a diagram illustrating an example 500 of SRS resource sets, in accordance with the present disclosure.
  • a base station 110 may configure a UE 120 with one or more SRS resource sets to allocate resources for SRS transmissions by the UE 120.
  • a configuration for SRS resource sets may be indicated in an RRC message (e g., an RRC configuration message or an RRC reconfiguration message).
  • an SRS resource set may include one or more resources (e.g., shown as SRS resources), which may include time resources and/or frequency resources (e.g., a slot, a symbol, a resource block, and/or a periodicity for the time resources).
  • an SRS resource may include one or more antenna ports on which an SRS is to be transmitted (e.g., in a time-frequency resource).
  • a configuration for an SRS resource set may indicate one or more time-frequency resources in which an SRS is to be transmitted and may indicate one or more antenna ports on which the SRS is to be transmitted in those time-frequency resources.
  • the configuration for an SRS resource set may indicate a use case or usage (e.g., in an SRS-SetUse information element) for the SRS resource set.
  • an SRS resource set may have a use case of antenna switching, codebook, non-codebook, or beam management.
  • An antenna switching SRS resource set may be used to indicate downlink CSI with reciprocity between an uplink and downlink channel. For example, when there is reciprocity between an uplink channel and a downlink channel, a base station 110 may use an antenna switching SRS (e.g., an SRS transmitted using a resource of an antenna switching SRS resource set) to acquire downlink CSI (e.g., to determine a downlink precoder to be used to communicate with the UE 120).
  • an antenna switching SRS e.g., an SRS transmitted using a resource of an antenna switching SRS resource set
  • downlink CSI e.g., to determine a downlink precoder to be used to communicate with the UE 120.
  • a codebook SRS resource set may be used to indicate uplink CSI when a base station 110 indicates an uplink precoder to the UE 120.
  • the base station 110 may use a codebook SRS (e.g, an SRS transmitted using a resource of a codebook SRS resource set) to acquire uplink CSI (e.g., to determine an uplink precoder to be indicated to the UE 120 and used by the UE 120 to communicate with the base station 110).
  • a codebook SRS e.g, an SRS transmitted using a resource of a codebook SRS resource set
  • virtual ports e.g., a combination of two or more antenna ports
  • a maximum transmit power may be supported at least for a codebook SRS.
  • a non-codebook SRS resource set may be used to indicate uplink CSI when the UE 120 selects an uplink precoder (e.g ., instead of the base station 110 indicating an uplink precoder to be used by the UE 120).
  • the base station 110 may use a non-codebook SRS (e.g., an SRS transmitted using a resource of a non-codebook SRS resource set) to acquire uplink CSI.
  • the non-codebook SRS may be precoded using a precoder selected by the UE 120 (e.g., which may be indicated to the base station 110).
  • a beam management SRS resource set may be used for indicating CSI for millimeter wave communications.
  • An SRS resource can be configured as periodic, semi-persistent (sometimes referred to as semi-persistent scheduling (SPS)), or aperiodic.
  • a periodic SRS resource may be configured via a configuration message that indicates a periodicity of the SRS resource (e.g., a slot-level periodicity, where the SRS resources occurs every Y slots) and a slot offset.
  • a periodic SRS resource may always be activated, and may not be dynamically activated or deactivated.
  • a semi-persistent SRS resource may also be configured via a configuration message that indicates a periodicity and a slot offset for the semi-persistent SRS resource, and may be dynamically activated and deactivated (e.g., using DO or a MAC control element (CE) (MAC-CE)).
  • An aperiodic SRS resource may be triggered dynamically, such as via DO (e.g., UE-specific DO or group common DCI) or a MAC-CE.
  • the UE 120 may be configured with a mapping between SRS ports (e.g., antenna ports) and corresponding SRS resources.
  • the UE 120 may transmit an SRS on a particular SRS resource using an SRS port indicated in the configuration.
  • an SRS resource may span N adjacent symbols within a slot (e.g., where N equals 1, 2, or 4).
  • the UE 120 may be configured with X SRS ports (e.g., where X ⁇ 4).
  • each of the X SRS ports may mapped to a corresponding symbol of the SRS resource and used for transmission of an SRS in that symbol.
  • different SRS resource sets indicated to the UE 120 may overlap (e.g., in time and/or in frequency, such as in the same slot).
  • a first SRS resource set (e.g., shown as SRS Resource Set 1) is shown as having an antenna switching use case.
  • this example antenna switching SRS resource set includes a first SRS resource (shown as SRS Resource A) and a second SRS resource (shown as SRS Resource B).
  • antenna switching SRS may be transmitted in SRS Resource A (e.g., a first time-frequency resource) using antenna port 0 and antenna port 1 and may be transmitted in SRS Resource B (e.g., a second timefrequency resource) using antenna port 2 and antenna port 3.
  • SRS Resource A e.g., a first time-frequency resource
  • SRS Resource B e.g., a second timefrequency resource
  • a second SRS resource set (e.g., shown as SRS Resource Set 2) may be a codebook use case.
  • this example codebook SRS resource set includes only the first SRS resource (shown as SRS Resource A).
  • codebook SRSs may be transmitted in SRS Resource A (e.g., the first time-frequency resource) using antenna port 0 and antenna port 1.
  • the UE 120 may not transmit codebook SRSs in SRS Resource B (e.g., the second time-frequency resource) using antenna port 2 and antenna port 3.
  • the configuration of one or more SRS resource sets may include a configuration of a comb spacing (K TC ), a comb offset (krc), and a cyclic shift parameter (n ⁇ s ) per SRS resource.
  • the comb spacing (K TC ) is a spacing between resource elements (REs) in an OFDM symbol.
  • the comb spacing (K TC ) may be configured as 2, 4, or 8 per SRS resource
  • the comb offset (k TC ) indicates an offset to a starting RE in an OFDM symbol.
  • the comb offset (k TC ) may be configured as 0, 1, ... , K TC — 1 per SRS resource.
  • the cyclic shift parameter (n ⁇ 5 ) determines a cyclic shift of the SRS (or the cyclic shift of the first SRS port in the case in which the SRS resource is configured with more than one antenna port).
  • the cyclic shift parameter (n ⁇ s RS ) may indicate a number of cyclic shifts and may be configured as 0, 1, ... , n ⁇ iax — 1 per SRS resource, where ngRTM ax is a maximum number of cyclic shifts.
  • the maximum number of cyclic shifts (n ⁇ ax ) may depend on the comb spacing (K TC ).
  • the maximum number of cyclic shifts (n ⁇ ax ) for each comb spacing ( 'T ) value may be specified in a wireless communication standard (e.g., a 3GPP standard). In some examples, may be 12 for K TC of 4, and n ⁇ iax may be 6 for K TC of 8.
  • the cyclic shift may be applied to a base sequence for the SRS as e ⁇ ain r u v (n), where antenna port number
  • N ⁇ p S is a number of antenna ports configured for the SRS resource
  • r u v (n) is the base sequence of length n.
  • Different cyclic shifts of the same base sequence are orthogonal, as long as the cyclic shift spacing does not become too small relative to the delay spread of the channel.
  • Different cyclic shifts may be used for different SRS ports (e.g., in a case in which an SRS resource is configured with more than one antenna port) or for different SRS resources (e.g., different SRS resources from the same UE or from different UEs).
  • different cyclic shifts may be used to ensure orthogonality among SRS transmissions from all antenna ports configured for a given SRS resource, or among SRS transmissions associated with different SRS resources (from the same UE or from different UEs).
  • multiple base sequences r u v (r) of flexible length are available for SRS transmissions.
  • multiple sequences for a given length may be organized in 30 different sequence groups, where u e ⁇ 0,1, ... ,29 ⁇ indexes a sequence group and v e ⁇ 0,1 ⁇ indexes sequences within a group.
  • Different base sequences (e.g., different (u, v)) may not be completely orthogonal, but may have low cross-correlation.
  • interference at the receiver (e.g., the base station), between SRSs transmitted using different base sequences may be low.
  • the configuration of one or more SRS resource sets may include a configuration of an SRS sequence identity n® s per SRS resource.
  • the configuration may also indicate, per SRS resource, whether group hopping, sequence hopping, or neither is configured.
  • the network may perform interference planning by assigning n® s to different SRS resources of different UEs across a same cell or different cells to avoid or reduce interference between the SRSs transmitted by the different UEs.
  • Group hopping refers to randomly or pseudo-randomly selecting the sequence group (e.g., randomly or pseudo-randomly selecting the group index u) for the base sequence for an SRS transmission in an SRS resource.
  • a pseudo-random sequence c(i) governing the group hopping may be initialized as c init at the beginning of each radio frame. In this way, interference randomization may be accomplished by hopping across the 30 groups of base sequences.
  • Sequence hopping refers to randomly or pseudo-randomly selecting a base sequence from multiple base sequences in a sequence group (randomly or pseudo-randomly selecting the sequence index v) for an SRS transmission in an SRS resource.
  • SRS resources may be configured within an SRS resource set that includes one or more SRS resources.
  • This configuration mechanism allows for multiple SRS resources to be activated (e.g., for semi-persistent SRS resources) or triggered (e.g., for aperiodic SRS resources) simultaneously.
  • An SRS resource set may be configured as aperiodic, semi-persistent, or periodic.
  • a base station may transmit DCI to a UE to trigger aperiodic SRS resource set for the UE.
  • an aperiodic SRS resource set may be triggered with downlink DCI (e.g., DCI format 1 1 or DCI format 1 2), uplink DCI (e.g., DCI format 0 1 or DCI format 0 2), or group-common DCI (e.g., DCI format 2 3).
  • the DCI may include an SRS request field, and the SRS request field may include a codepoint that indicates one or more SRS resource sets.
  • a mapping between SRS resource sets and the SRS request codepoints (e.g., 01, 10, and 11) may be indicated in RRC configuration information (e g., aperiodicSRS-ResourceTrigger or aperiodicSRS-ResourceTriggerList).
  • a base station may transmit a MAC-CE to a UE that activates or deactivates a semi-persistent SRS resource set for the UE.
  • Fig. 5 is provided as an example. Other examples may differ from what is described with regard to Fig. 5.
  • CJT coherence joint transmission
  • multiple TRPs may receive SRS transmissions from a UE.
  • multiple UEs may be configured to transmit SRSs on the same OFDM symbols, on the same REs, and with the same cyclic shift.
  • interference mitigation or randomization relies on using the UE’s different SRS base sequences for the SRS transmissions.
  • either group hopping (across 30 groups) or sequence hopping (across 2 sequences within a group) may be configured for interference randomization.
  • a UE cannot currently be configured to hop across all 60 sequences, and group hopping or sequence hopping may not be provide sufficient interference randomization, particularly in cases in which multiple UEs are communicating with multiple TRPs.
  • cross-SRS interference may reduce the quality of SRS measurements performed by the TRPs.
  • Some techniques and apparatuses described herein enable a UE to receive, from a network entity, a configuration of an SRS resource.
  • the configuration may indicate a sequence index value for a base sequence for the SRS resource.
  • the configuration may indicate that the SRS resource is configured with group hopping and sequence hopping.
  • the UE may transmit an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the configuration by indicating the sequence index value for the SRS resource instead of fixing the sequence index value at 0, can increase the number of base sequences that can be assigned to different SRS resources for interference planning.
  • the SRS resource may be configured with both group hopping and sequence hopping, which increases the number of sequences used for interference randomization.
  • interference mitigation via interference planning and/or interference randomization, is enhanced, which may reduce cross-interference SRS, particularly in cases in which multiple UEs communicate with multiple TRPs.
  • the network may attempt to configure SRS parameters to ensure orthogonality and/or to minimize or randomize interference between SRS transmissions.
  • the set of UEs that transmit SRSs on the same resource REs and OFDM symbols may depend on dynamic factors, such as scheduling decisions and downlink traffic.
  • most SRS parameters e.g., comb spacing, comb offset, cyclic shift, SRS sequence identity, and/or group or sequence hopping
  • the configured SRS parameters may not reflect current dynamic factors, such as scheduling decisions and downlink traffic.
  • Some techniques and apparatuses described herein enable, a network entity to transmit, and a UE to receive, a configuration of parameters for an SRS resource of an SRS resource set.
  • the network entity may transmit, and the UE may receive, a dynamic indication an updated values for one or more of the parameters for the SRS resource.
  • the dynamic indication may include an updated value for at least one of a comb spacing parameter, a comb offset parameter, a cyclic shift parameter, an SRS sequence identity, or a parameter indicating whether group hopping or sequence hopping is enabled for the SRS resource.
  • the UE may transmit the SRS in the SRS resource in accordance with the updated values for the one or more of the parameters for the SRS resource.
  • the SRS parameters that affect orthogonality and/or interference mitigation e.g., comb spacing, comb offset, cyclic shift, SRS sequence identity, and/or group or sequence hopping
  • Fig. 6 is a diagram illustrating an example 600 associated with enhanced interference mitigation for SRS, in accordance with the present disclosure. As shown in Fig.
  • example 600 includes communication between a network entity 605 (e.g., base station 110, CU 310, DU 330, RU 340, or a combination thereof) and a UE 120.
  • the network entity 605 and the UE 120 may be included in a wireless network, such as wireless network 100.
  • the network entity 605 and the UE 120 may communicate via a wireless access link, which may include an uplink and a downlink.
  • the network entity 605 may transmit, and the UE 120 may receive, a configuration of an SRS resource.
  • the configuration of the SRS resource may include an indication of a sequence index value v for a base sequence for the SRS resource, an indication that the SRS resource is configured with group hopping and frequency hopping, or a combination thereof.
  • the SRS resource may be included in an SRS resources, and the configuration of the SRS resource may be included in configuration information for the SRS resource set.
  • the configuration information may include configuration information for multiple SRS resource sets, each including one or more SRS resources.
  • the configuration information may be transmitted, from the network entity 605 to the UE 120, in an RRC message.
  • the configuration information may include a configuration of a set of SRS parameters for each SRS resource in an SRS resource set.
  • the configuration of an SRS resource may include a configuration of a comb spacing parameter K TC , comb offset parameter k TC , a cyclic shift parameter n s c R s S , and/or an SRS sequence identity n p s for the SRS resource.
  • the SRS sequence identity n® s may indicate the sequence group index value u that identifies the sequence group for the base sequence for the SRS resource (e.g., when group hopping is not configured for the SRS resource) or may be used to initiate a pseudo-random sequence for group hopping (e.g., when group hopping is configured for the SRS resource).
  • the configuration for an SRS resource may indicate a sequence index value v for the base sequence for the SRS resource.
  • the configuration for an SRS resource with a length that is equal to or larger than a length threshold (e.g., 72 bits) may indicate the sequence index value v for the base sequence of the SRS resource.
  • the configuration information for one or more SRS resources sets may indicate a respective sequence index value v per SRS resource, for all SRS resources with an SRS sequence length that is equal to or largerthan the length threshold (e g., 72 bits).
  • the sequence index value v may identify a sequence, among multiple sequences in a sequence group.
  • the sequence index value v for an SRS resource may be either 0 (e.g., corresponding to a first sequence in a group) or 1 (e.g., corresponding to second sequence in a group).
  • the configuration of the SRS resource sequence may include an explicit indication of the index value v configured for the SRS resource.
  • one or more other parameters in the configuration of the SRS resource may provide an implicit indication of the sequence index value v for the SRS resource.
  • the SRS sequence identity s may provide an indication of the sequence index value v as v mod 2 In this case, the UE 120 may derive the sequence index value v from the SRS sequence identity drape n si ⁇ s ID •
  • the configuration of the SRS resource may indicate whether group hopping, sequence hopping, neither, or both is configured for the SRS resource.
  • the configuration may indicate the sequence index value v for an SRS resource that is configured with neither group hopping, nor sequence hopping. In this case, both the group index value u and the sequence index v may be fixed for the SRS resource across all OFDM symbols. In this way, both the group index value u and the sequence index value v for the SRS sequence are configurable (e.g., via the configuration information) by the network entity 605 or another network device.
  • the network entity 605 or another network device may configure respective group index values u and sequence index values v for SRS resources configured for the UE 120 and/or one or more other UEs to perform interference planning in order to avoid or reduce interference between SRS transmissions in the SRS resources.
  • the network entity 605 or another network device may perform interference planning by selecting base sequences for SRS resources from among 60 different base sequences that have low cross-correlation properties.
  • the configuration of an SRS resource may indicate the sequence index value v for an SRS resource, and only group hopping may be configured for the SRS resource.
  • the sequence index value v may be fixed across all symbols and configurable for the SRS resource by the network entity 605 or another network device. In this way, interference randomization by performing hopping across values of u for SRS transmissions in the SRS resource may be combined with interference planning by configuring the values of v for one or more SRS resources.
  • the configuration of an SRS resource may indicate the sequence index value v for an SRS resource, and sequence hopping (e.g., within a group) may be configured for the SRS resource.
  • the configuration of an SRS resource may indicate that the SRS resource is configured with both group hopping and sequence hopping.
  • a configuration of an SRS resource with a length that is equal to or larger than a length threshold (e.g., 72 bits) may indicated that both group hopping and sequence hopping is configured for the SRS resource.
  • the UE 120 may be configured to perform hopping across the values of u and the values of v for SRS transmissions in the SRS resource in different symbols in which the SRS resource is configured based at least in part on a pseudo-random sequence that is a function of a slot number and an OFDM symbol number associated with each SRS transmission.
  • the UE 120 may be configured to hop across 60 base sequence for improved interference randomization, as compared to only performing group hopping or sequence hopping.
  • the UE 120 may transmit the SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the network entity 605 may receive the SRS transmitted by the UE 120.
  • the UE 120 may transmit, and the network entity 605 may receive, multiple SRS transmissions in different OFDM symbols configured for the SRS resource in one or more slots.
  • the configuration of the SRS resource may indicate the sequence index value v for the SRS resource, and the SRS resource may be configured with neither group hopping, nor sequence hopping.
  • the configuration may also indicate the group index value u, and the UE 120 may transmit the SRS using a base sequence associated with the group index value u and the sequence index value v in all of the OFDM symbols in which the SRS resource is configured.
  • the configuration of the SRS resource may indicate the sequence index value v for the SRS resource, and group hopping may be configured for SRS resource (e.g., the SRS resource may be configured with group hopping and not sequence hopping).
  • the UE 120 may select a group index value u using group hopping over the set of sequence groups based at least in part on a pseudo-random sequence c(Z) and based at least in part on an OFDM symbol number and a slot number.
  • the UE 120 may transmit the SRS using a respective base sequence associated with the sequence index value v indicated by the configuration of the SRS resource and the group index value u selected for that OFDM sequence using group hopping.
  • the configuration of the SRS resource may indicate the sequence index value v for the SRS resource, and sequence hopping (e.g., within a group) may be configured for SRS resource (e.g., the SRS resource may be configured with sequence hopping and not group hopping).
  • sequence hopping e.g., within a group
  • the SRS resource may be configured with sequence hopping and not group hopping.
  • the UE 120 may ignore the sequence index value v indicated in the configuration when performing sequence hopping.
  • the UE 120 may transmit the SRS using a base sequence associated with group index value u indicated by the configuration of the SRS resource and the group index value v selected for that OFDM.
  • the UE 120 may select the sequence index value v for each OFDM symbol in which the SRS resource is configured using sequence hopping based at least in part on the sequence index value indicated by the configuration. For example, the indicated sequence index value may be used as an initialization point for pseudo-random sequence c(Z) that governs the sequence hopping.
  • the UE 120 may determine the sequence index value v for an OFDM symbol as v mod 2.
  • the UE 120 may transmit the SRS using a base sequence associated with group index value u indicated by the configuration of the SRS resource and the group index value v selected for that OFDM using sequence hopping (e.g., based at least in part on the indicated sequence index value).
  • the configuration of the SRS resource may indicate that the SRS resource is configured with both group hopping and sequence hopping.
  • the UE 120 may separately select, for each OFDM symbol in which the SRS resource is configured, a group index value u using group hopping in accordance with a pseudo-random sequence c(i) based at least in part on the symbol number and the slot number and a sequence index value v using sequence hopping in accordance the pseudo-random sequence c(i) based at least in part on the symbol number and the slot number.
  • the UE 120 may determine the sequence index value v using sequence hopping based at least in part on the indicated sequence index value, as described above.
  • the UE 120 may transmit the SRS, in each OFDM symbol in which the SRS resource is configured, using a respective base sequence associated with the selected group index value u and the selected sequence index value v for the OFDM symbol.
  • the UE 120 may generate a number (z) based at least in part on a pseudo-random sequence c(i) as a function of the slot number and the OFDM symbol number. The UE 120 may then determine the group index value u and the sequence index value v for the OFDM symbol based at least in part on the number z generated for the OFDM symbol. For example, z may be a number (e.g., 0 ⁇ z ⁇ 59) generated mod 60, where M is a fixed number.
  • the UE 120 may transmit the SRS, in each OFDM symbol in which the SRS resource is configured, using a respective base sequence associated with the selected group index value u and the selected sequence index value v for the OFDM symbol.
  • the value of N may fixed (e.g., specified in a wireless communication standard), RRC -configured (e.g., indicated in the configuration of the SRS resource or SRS resource set), or determined as a function of the subcarrier spacing.
  • the number of SRS symbols within a radio frame may be well below 60.
  • the group and sequence hopping can hop across more of the 60 total base sequences available, as compared to re -initializing the pseudo-random sequence c(i) every frame.
  • initializing the pseudo-random sequence every N frames may be used when both group hopping and frequency hopping is configured for an SRS resource, when only group hopping is configured for an SRS resource, and/or when only sequence hopping is configured for an SRS resource.
  • Fig. 7 is a diagram illustrating an example 700 associated with enhanced interference mitigation for SRS, in accordance with the present disclosure.
  • example 700 includes communication between a network entity 705 (e.g., base station 110, CU 310, DU 330, RU 340, or a combination thereof) and a UE 120.
  • the network entity 705 and the UE 120 may be included in a wireless network, such as wireless network 100.
  • the network entity 705 and the UE 120 may communicate via a wireless access link, which may include an uplink and a downlink.
  • a wireless access link which may include an uplink and a downlink.
  • the network entity 705 may transmit, and the UE 120 may receive, a configuration of an SRS resource set.
  • the SRS resource set may be included in one or more SRS resources, and the configuration of the SRS resource set may include a configuration of each SRS resource included in the SRS resource set.
  • the configuration may include configuration information for multiple SRS resource sets, each including one or more SRS resources.
  • the configuration may be transmitted, from the network entity 705 to the UE 120, in an RRC message.
  • the configuration may include a configuration of a set of SRS parameters for each SRS resource in the SRS resource set.
  • the configuration of an SRS resource may include a configuration of a comb spacing parameter K TC , comb offset parameter k TC , a cyclic shift parameter n s c R s S , an SRS sequence identity n® 8 for the SRS resource (e.g., which indicates a group index value u) or an indication of the group index parameter u, and/or a parameter that indicates whether at least one of group hopping or sequence hopping is configured for the SRS resource.
  • the parameter that indicates whether at least one of group hopping or sequence hopping is configured for the SRS resource may indicate that group hopping is enabled for the SRS resource, sequence hopping is enabled for the SRS resource, neither group hopping, nor sequence hopping, is enabled for the SRS resource, or both group hopping and sequence hopping is enabled for the SRS resource.
  • the network entity 705 may transmit, and the UE 120 may receive, a dynamic indication of one or more SRS parameters for an SRS resource.
  • the dynamic indication may indicate updated values for one or more of the SRS parameters configured for an SRS resource.
  • the dynamic indication may be included in DCI or a MAC-CE transmitted to the UE 120 by the network entity 705.
  • values for multiple SRS parameters can be jointly coded in a bit field of the DCI or MAC-CE.
  • the values for SRS parameters may be jointly coded due, at least in part, to value ranges of some SRS parameters not being completely independent.
  • value of the bit field in the DCI or MAC-CE may indicate an index value that maps to a profile with a set of values (e.g., updated values) for the multiple SRS parameters.
  • a set of profiles and corresponding index values may be configured (e g., in RRC configuration information) for the UE 120.
  • the network e.g., the network entity 705 and/or another network device
  • values for the comb spacing parameter K TC and the comb offset parameter k TC may be jointly coded in a one bit field of the DCI or MAC-CE.
  • K TC and k TC may be jointly coded in a bit field with 4 bits, as there may be only 14 possible combinations of values (e.g., 2+4+8).
  • the comb spacing parameter K TC , the comb offset parameter k TC , and the cyclic shift parameter may be jointly encoded in one bit field of the DCI or MAC-CE.
  • K TC , k TC , and n ⁇ R s S may be jointly encoded in one bit field with 7 bits, as there may be 112 possible combinations of values (e.g., 2*8+4*12+8*6).
  • the group index value u, the parameter that indicates whether at least one of group hopping or sequence hopping is enabled may be jointly encoded in one bit field of the DCI or MAC-CE.
  • the group index value u, the parameter that indicates group or sequence hopping may be jointly encoded in one bit field with 5 bits, as there may be 61 possible combinations of values (e.g., 30+30+1).
  • u when neither group hopping, nor sequence hopping, is enabled, u can be dynamically indicated as 0, ... ,29, when sequence hopping is enabled, u can be dynamically indicated as 0, ... ,29, and when group hopping is enabled, u does not need to be dynamically indicated.
  • the dynamic indication of the updated values for the one or more SRS parameters can be for a particular SRS resource, for an SRS resource set (e.g., applied to all SRS resources within an SRS resource set), or for multiple SRS resource sets (e.g., applied to all SRS resources within the SRS resource sets).
  • a case in which the dynamic indication is for multiple SRS resource sets may provide a benefit of allowing SRS parameters for SRS resources in multiple SRS resource sets to be dynamically updated with a small signaling overhead.
  • the criteria for selecting the multiple SRS resource sets for which the SRS parameters are updated may be based at least in part on the usage configured for each SRS resource set (e.g., all SRS resource sets with a usage set to “antenna switching” or SRS resource sets associated with another usage).
  • the dynamic indication may be included in DCI.
  • the dynamic indication may be included in the same DCI that triggers one or more SRS resource sets (e.g., one or more aperiodic SRS resource sets).
  • the updated values dynamically indicated in the triggering DCI may be applied to all SRS resources within the SRS resource sets triggered by the DCI.
  • the SRS field of the DCI e.g., the triggering DCI
  • each value of the SRS request field may be associated with a respective set of values for one or more SRS parameters, and the association between different values of the SRS request field and respective sets of values for the SRS parameters may be indicated via RRC configuration.
  • the dynamic indication of the values for the one or more SRS parameters may be included in one or more unused bit fields of the uplink DCI, such as a time domain resource allocation (TDRA) field, a frequency domain resource allocation (FDRA) field, an MCS field, a new data indicator (NDI) field, a hybrid automatic repeat request (HARQ) identifier (ID) field, and/or redundancy version (RV) field, among other examples.
  • downlink DCI (e.g., DCI format 1 1 or 1 2) may be used to trigger one or more aperiodic SRS resource sets without scheduling a PDSCH communication for the UE 120.
  • some of the fields e.g., FDRA
  • FDRA unused bit fields of the downlink DCI, such as the TDRA field, the MCS field, the NDI field, the HARQ ID field, the RV field, and/or the antenna port(s) field, among other examples, may be used for the dynamic indication of the values for the one or more SRS parameters.
  • the dynamic indication may be included in a new DCI format, which may or may not trigger one or more SRS resource sets.
  • the DCI may include an indication of one or multiple SRS resource IDs to which the indicated set of values for one or more SRS parameters applies, or the DCI may include an indication a resource set ID (or multiple resource set IDs) to which the indicated set of values for one or more SRS parameters applies.
  • the DCI may be used to dynamically indicate updated values for periodic, semi-persistent, and/or aperiodic SRS resources or SRS resource sets.
  • the dynamic indication may be included in a MAC-CE.
  • the dynamic indication may be included in the same MAC-CE that activates an SRS resource set (e.g., a semi-persistent SRS resource set).
  • the UE 120 may apply the indication to all SRS resources included in the activated SRS resource set.
  • the dynamic indication may be included in a new MAC-CE, which may or may not activate an SRS resource set.
  • the MAC-CE may include an indication of one or multiple SRS resource IDs to which the indicated set of values for one or more SRS parameters applies, or the MAC-CE may include an indication a resource set ID (or multiple resource set IDs) to which the indicated set of values for one or more SRS parameters applies.
  • the MAC-CE may be used to dynamically indicate updated values for periodic, semi-persistent, and/or aperiodic SRS resources or SRS resource sets.
  • the UE 120 may transmit an SRS in the SRS resource in accordance with the one or more dynamically indicated SRS parameters indicated in the dynamic indication.
  • the network entity 705 may receive the SRS transmitted by the UE 120.
  • the UE 120 may transmit, and the network entity 705 may receive, multiple SRS transmissions in different OFDM symbols configured for the SRS resource in one or more slots.
  • the UE 120 in connection with receiving the dynamic indication of updated values for one or more SRS parameters that applied to one or more SRS resources, may apply the updated values for the one or more parameters (e g., instead of original values for the one or more parameters configured in the configuration).
  • Fig. 7 is provided as an example. Other examples may differ from what is described with respect to Fig. 7.
  • FIG. 8 is a diagram illustrating an example process 800 performed, for example, by a UE, in accordance with the present disclosure.
  • Example process 800 is an example where the UE (e g., UE 120) performs operations associated with enhanced interference mitigation for SRS.
  • process 800 may include receiving a configuration of an SRS resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping (block 810).
  • the UE e.g., using communication manager 140 and/or reception component 1202, depicted in Fig. 12
  • process 800 may include transmitting an SRS in the SRS resource in accordance with the configuration of the SRS resource (block 820).
  • the UE e g., using communication manager 140 and/or transmission component 1204, depicted in Fig. 12
  • Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the configuration includes an indication of the sequence index value for the base sequence for the SRS resource.
  • the configuration includes an indication of a sequence identity of the SRS resource, and the sequence identity of the SRS resource indicates the sequence index value for the base sequence for the SRS resource.
  • the configuration of the SRS resource is included in a configuration of an SRS resource set including a plurality of SRS resources, and the configuration of the SRS resource set indicates a respective sequence index value for each SRS resource of the plurality of SRS resources.
  • the configuration indicates the sequence index value and a group index value for the base sequence for the SRS resource
  • transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises transmitting the SRS using a base sequence associated with the group index value and the sequence index value in all of one or more symbols in which the SRS resource is configured.
  • the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that group hopping is configured for the SRS resource
  • transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence associated with the sequence index value and a group index value selected using group hopping over a plurality of base sequence groups.
  • the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that sequence hopping is configured for the SRS resource
  • transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence selected using sequence hopping based at least in part on the sequence index value indicated by the configuration.
  • the configuration indicates that the SRS resource is configured with group hopping and sequence hopping, and transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence associated with a group index value selected using group hopping in accordance with a pseudo-random sequence based at least in part on a slot number and a symbol number and a sequence index value selected using sequence hopping in accordance with the pseudo-random sequence based at least in part on the slot number and the symbol number.
  • the pseudo-random sequence is initialized every N radio frames, and N is greater than 1.
  • N is indicated in the configuration or N is based at least in part on a subcarrier spacing.
  • the configuration indicates that the SRS resource is configured with group hopping and sequence hopping, and transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence associated with a group index value and a sequence index value, wherein the group index value and the sequence index value are determined based at least in part on a number generated in accordance with a pseudo-random sequence based at least in part on a slot number and a symbol number.
  • the pseudo-random sequence is initialized every N radio frames, and N is greater than 1.
  • N is indicated in the configuration or N is based at least in part on a subcarrier spacing.
  • the configuration indicates at least one of a comb spacing for the SRS resource, a comb offset for the SRS resource, a cyclic shift for the SRS resource, an SRS sequence identity for the SRS resource, a group index value for the base sequence for the SRS resource, or whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • process 800 includes receiving an indication of at least one of an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • transmitting the SRS in the SRS resource comprises transmitting the SRS in the SRS resource in accordance with the at least one of the updated comb spacing for the SRS resource, the updated comb offset for the SRS resource, the updated cyclic shift for the SRS resource, the updated SRS sequence identity for the SRS resource, the updated group index value for the base sequence for the SRS resource, or the update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the indication is included in DCI or a MAC-CE.
  • the indication is included in DCI that triggers one or more SRS resource sets.
  • the indication is included in a MAC-CE that activates a semi- persistent SRS resource set that includes the SRS resource.
  • two or more of the an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource are jointly coded into a bit field of the DCI or the MAC-CE.
  • Fig. 8 shows example blocks of process 800
  • process 800 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 8. Additionally, or alternatively, two or more of the blocks of process 800 may be performed in parallel.
  • Fig. 9 is a diagram illustrating an example process 900 performed, for example, by a network entity, in accordance with the present disclosure.
  • Example process 900 is an example where the network entity (e.g., network entity 605, network entity 705, base station 110, CU 310, DU 330, RU 340, or a combination thereof) performs operations associated with enhanced interference mitigation for SRS.
  • the network entity e.g., network entity 605, network entity 705, base station 110, CU 310, DU 330, RU 340, or a combination thereof
  • process 900 may include transmitting a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping (block 910).
  • the network entity e.g., using communication manager 1308 and/or transmission component 1304, depicted in Fig. 13
  • Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the configuration includes an indication of the sequence index value for the base sequence for the SRS resource.
  • the configuration includes an indication of a sequence identity of the SRS resource, and the sequence identity of the SRS resource indicates the sequence index value for the base sequence for the SRS resource.
  • the configuration of the SRS resource is included in a configuration of an SRS resource set including a plurality of SRS resources, and the configuration of the SRS resource set indicates a respective sequence index value for each SRS resource of the plurality of SRS resources.
  • the configuration indicates the sequence index value and a group index value for the base sequence for the SRS resource, and the configuration indicates that neither group hopping, nor sequence hopping, is configured for the SRS resource.
  • the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that group hopping is configured for the SRS resource.
  • the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that sequence hopping is configured for the SRS resource.
  • the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the configuration indicates a number of frames associated with initializing a pseudo-random sequence for the group hopping and the sequence hopping, and the number of frames is greater than 1.
  • the configuration indicates at least one of a comb spacing for the SRS resource, a comb offset for the SRS resource, a cyclic shift for the SRS resource, an SRS sequence identity for the SRS resource, a group index value for the base sequence for the SRS resource, or whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • process 900 includes transmitting an indication of at least one of an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • receiving the SRS in the SRS resource comprises receiving the SRS in the SRS resource in accordance with the at least one of the updated comb spacing for the SRS resource, the updated comb offset for the SRS resource, the updated cyclic shift for the SRS resource, the updated SRS sequence identity for the SRS resource, the updated group index value for the base sequence for the SRS resource, or the update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the indication is included in DCI or a MAC-CE.
  • the indication is included in DCI that triggers one or more SRS resource sets.
  • the indication is included in a MAC-CE that activates a semi- persistent SRS resource set that includes the SRS resource.
  • two or more of the an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource are jointly coded into a bit field of the DCI or the MAC-CE.
  • process 900 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 9. Additionally, or alternatively, two or more of the blocks of process 900 may be performed in parallel.
  • Fig. 10 is a diagram illustrating an example process 1000 performed, for example, by a UE, in accordance with the present disclosure.
  • Example process 1000 is an example where the UE (e.g., UE 120) performs operations associated with enhanced interference mitigation for SRS.
  • process 1000 may include receiving a configuration of parameters for an SRS resource of an SRS resource set (block 1010).
  • the UE e g., using communication manager 140 and/or reception component 1202, depicted in Fig. 12
  • process 1000 may include receiving a dynamic indication of an updated value for at least one of the parameters for the SRS resource (block 1020).
  • the UE e g., using communication manager 140 and/or reception component 1202, depicted in Fig. 12
  • process 1000 may include transmitting an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource (block 1030).
  • the UE e.g., using communication manager 140 and/or transmission component 1204, depicted in Fig. 12
  • Process 1000 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the at least one of the parameters for the SRS resource includes at least one of a comb spacing parameter, a comb offset parameter, a cyclic shift parameter, an SRS sequence identity, a group index value, or a parameter that indicates whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the dynamic indication is included in DCI or a MAC-CE.
  • the indication is included in DCI that triggers one or more SRS resource sets.
  • the SRS resource set is a semi-persistent SRS resource set
  • the dynamic indication is included in a MAC-CE that activates the SRS resource set.
  • the dynamic indication includes an indication, in a bit field of the DCI or the MAC-CE, that is jointly coded to indicate updated values for two or more of the parameters for the SRS resource.
  • process 1000 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 10. Additionally, or alternatively, two or more of the blocks of process 1000 may be performed in parallel.
  • Fig. 11 is a diagram illustrating an example process 1100 performed, for example, by a network entity, in accordance with the present disclosure.
  • Example process 1100 is an example where the network entity (e.g., network entity 705, network entity 605, base station 110, CU 310, DU 330, RU 340, or a combination thereof) performs operations associated with enhanced interference mitigation for SRS.
  • the network entity e.g., network entity 705, network entity 605, base station 110, CU 310, DU 330, RU 340, or a combination thereof
  • performs operations associated with enhanced interference mitigation for SRS e.g., SRS.
  • process 1100 may include transmitting a configuration of parameters for an SRS resource of an SRS resource set for a UE (block 1110).
  • the network entity e.g., using communication manager 1308 and/or transmission component 1304, depicted in Fig. 13
  • process 1100 may include transmitting a dynamic indication of an updated value for at least one of the parameters for the SRS resource (block 1120).
  • the network entity e.g., using communication manager 1308 and/or transmission component 1304, depicted in Fig. 13
  • process 1100 may include receiving an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource (block 1130).
  • the network entity e.g., using communication manager 1308 and/or reception component 1302, depicted in Fig. 13
  • Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • the at least one of the parameters for the SRS resource includes at least one of a comb spacing parameter, a comb offset parameter, a cyclic shift parameter, an SRS sequence identity, a group index value, or a parameter that indicates whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the SRS resource set is a semi-persistent SRS resource set
  • the dynamic indication is included in a MAC-CE that activates the SRS resource set.
  • the dynamic indication includes an indication, in a bit field of the DCI or the MAC-CE, that is jointly coded to indicate updated values for two or more of the parameters for the SRS resource.
  • process 1100 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 11. Additionally, or alternatively, two or more of the blocks of process 1100 may be performed in parallel.
  • Fig. 12 is a diagram of an example apparatus 1200 for wireless communication.
  • the apparatus 1200 may be a UE, or a UE may include the apparatus 1200.
  • the apparatus 1200 includes a reception component 1202 and a transmission component 1204, which may be in communication with one another (for example, via one or more buses and/or one or more other components).
  • the apparatus 1200 may communicate with another apparatus 1206 (such as a UE, a base station, or another wireless communication device) using the reception component 1202 and the transmission component 1204.
  • the apparatus 1200 may include the communication manager 140.
  • the communication manager 140 may include a selection component 1208, among other examples.
  • the apparatus 1200 may be configured to perform one or more operations descnbed herein in connection with Figs. 6-7. Additionally, or alternatively, the apparatus 1200 may be configured to perform one or more processes described herein, such as process 800 of Fig. 8, process 1000 of Fig. 10, or a combination thereof.
  • the apparatus 1200 and/or one or more components shown in Fig. 12 may include one or more components of the UE described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 12 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.
  • the reception component 1202 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1206.
  • the reception component 1202 may provide received communications to one or more other components of the apparatus 1200.
  • the reception component 1202 may perform signal processing on the received communications (such as fdtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 1200.
  • the reception component 1202 may include one or more antennas, a modem, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the UE described in connection with Fig. 2.
  • the transmission component 1204 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1206.
  • one or more other components of the apparatus 1200 may generate communications and may provide the generated communications to the transmission component 1204 for transmission to the apparatus 1206.
  • the transmission component 1204 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 1206.
  • the transmission component 1204 may include one or more antennas, a modem, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the UE described in connection with Fig. 2. In some aspects, the transmission component 1204 may be co-located with the reception component 1202 in a transceiver.
  • the reception component 1202 may receive a configuration of an SRS resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the transmission component 1204 may transmit an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the selection component may select a group index value using group hopping and/or select a sequence index value using sequence hopping.
  • the reception component 1202 may receive an indication of at least one of an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the transmission component 1204 may transmit the SRS in the SRS resources in accordance with the at least one of the updated comb spacing for the SRS resource, the updated comb offset for the SRS resource, the updated cyclic shift for the SRS resource, the updated SRS sequence identity for the SRS resource, the updated group index value for the base sequence for the SRS resource, or the update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the reception component 1202 may receive a configuration of parameters for an SRS resource of an SRS resource set.
  • the reception component 1202 may receive a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the transmission component 1204 may transmit an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • Fig. 12 The number and arrangement of components shown in Fig. 12 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 12. Furthermore, two or more components shown in Fig. 12 may be implemented within a single component, or a single component shown in Fig. 12 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 12 may perform one or more functions described as being performed by another set of components shown in Fig. 12.
  • Fig. 13 is a diagram of an example apparatus 1300 for wireless communication.
  • the apparatus 1300 may be a network entity, or a network entity may include the apparatus 1300.
  • the apparatus 1300 includes a reception component 1302 and a transmission component 1304, which may be in communication with one another (for example, via one or more buses and/or one or more other components).
  • the apparatus 1300 may communicate with another apparatus 1306 (such as a UE, a base station, or another wireless communication device) using the reception component 1302 and the transmission component 1304.
  • the apparatus 1300 may include the communication manager 1308.
  • the communication manager 1308 may include a selection component 1310, among other examples.
  • the apparatus 1300 may be configured to perform one or more operations described herein in connection with Figs. 6-7. Additionally, or alternatively, the apparatus 1300 may be configured to perform one or more processes described herein, such as process 900 of Fig. 9, process 1100 ofFig. 11, or a combination thereof.
  • the apparatus 1300 and/or one or more components shown in Fig. 13 may include one or more components of the network entity described in connection with Fig. 2. Additionally, or alternatively, one or more components shown in Fig. 13 may be implemented within one or more components described in connection with Fig. 2. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instractions or code stored in a non-transitory computer-readable medium and executable by a controller or a processor to perform the functions or operations of the component.
  • the communication manager 1308 may control and/or otherwise manage one or more operations of the reception component 1302 and/orthe transmission component 1304.
  • the communication manager 1308 may include one or more antennas, a modem, a controller/processor, a memory, or a combination thereof, of the base station described in connection with Fig. 2.
  • the communication manager 1308 may be, or be similar to, the communication manager 150 depicted in Figs. 1 and 2.
  • the communication manager 1308 may be configured to perform one or more of the functions described as being performed by the communication manager 150 depicted in Figs. 1 and 2.
  • the communication manager 1308 may include the reception component 1302 and/orthe transmission component 1304.
  • the reception component 1302 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 1306.
  • the reception component 1302 may provide received communications to one or more other components of the apparatus 1300.
  • the reception component 1302 may perform signal processing on the received communications (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, demterleavmg, de-mapping, equalization, interference cancellation, or decoding, among other examples), and may provide the processed signals to the one or more other components of the apparatus 1300.
  • the reception component 1302 may include one or more antennas, a modem, a demodulator, a MIMO detector, a receive processor, a controller/processor, a memory, or a combination thereof, of the network entity described in connection with Fig. 2.
  • the transmission component 1304 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 1306.
  • one or more other components of the apparatus 1300 may generate communications and may provide the generated communications to the transmission component 1304 for transmission to the apparatus 1306.
  • the transmission component 1304 may perform signal processing on the generated communications (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples), and may transmit the processed signals to the apparatus 1306.
  • the transmission component 1304 may include one or more antennas, a modem, a modulator, a transmit MIMO processor, a transmit processor, a controller/processor, a memory, or a combination thereof, of the network entity described in connection with Fig. 2. In some aspects, the transmission component 1304 may be co-located with the reception component 1302 in a transceiver.
  • the transmission component 1304 may transmit a configuration of an SRS resource for a UE, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • the reception component 1302 may receive an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • the selection component 1310 may select the sequence index value for the base sequence for the SRS resource or may select whether the SRS resource is configured with group hopping and sequence hopping.
  • the transmission component 1304 may transmit an indication of at least one of an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the transmission component 1304 may transmit the SRS in the SRS resources in accordance with the at least one of the updated comb spacing for the SRS resource, the updated comb offset for the SRS resource, the updated cyclic shift for the SRS resource, the updated SRS sequence identity for the SRS resource, the updated group index value for the base sequence for the SRS resource, or the update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • the transmission component 1304 may transmit a configuration of parameters for an SRS resource of an SRS resource set for a UE.
  • the transmission component 1304 may transmit a dynamic indication of an updated value for at least one of the parameters for the SRS resource.
  • the reception component 1302 may receive an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • Fig. 13 The number and arrangement of components shown in Fig. 13 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 13. Furthermore, two or more components shown in Fig. 13 may be implemented within a single component, or a single component shown in Fig. 13 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 13 may perform one or more functions described as being performed by another set of components shown in Fig. 13.
  • Aspect 1 A method of wireless communication performed by a user equipment (UE), comprising: receiving a configuration of a sounding reference signal (SRS) resource, wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping; and transmitting an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • SRS sounding reference signal
  • Aspect 2 The method of Aspect 1, wherein the configuration includes an indication of the sequence index value for the base sequence for the SRS resource.
  • Aspect 3 The method of Aspect 1, wherein the configuration includes an indication of a sequence identity of the SRS resource, and wherein the sequence identity of the SRS resource indicates the sequence index value for the base sequence for the SRS resource.
  • Aspect 4 The method of any of Aspects 1-3, wherein the configuration of the SRS resource is included in a configuration of an SRS resource set including a plurality of SRS resources, and wherein the configuration of the SRS resource set indicates a respective sequence index value for each SRS resource of the plurality of SRS resources.
  • Aspect 5 The method of any of Aspects 1-4, wherein the configuration indicates the sequence index value and a group index value for the base sequence for the SRS resource, and wherein transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises: transmitting the SRS using a base sequence associated with the group index value and the sequence index value in all of one or more symbols in which the SRS resource is configured.
  • Aspect 6 The method of any of Aspects 1-4, wherein the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that group hopping is configured for the SRS resource, and wherein transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises: transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence associated with the sequence index value and a group index value selected using group hopping over a plurality of base sequence groups.
  • Aspect 7 The method of any of Aspects 1-4, wherein the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that sequence hopping is configured for the SRS resource, and wherein transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises: transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence selected using sequence hopping based at least in part on the sequence index value indicated by the configuration.
  • Aspect 8 The method of any of Aspects 1-4, wherein the configuration indicates that the SRS resource is configured with group hopping and sequence hopping, and wherein transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises: transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence associated with a group index value selected using group hopping in accordance with a pseudo-random sequence based at least in part on a slot number and a symbol number and a sequence index value selected using sequence hopping in accordance with the pseudo-random sequence based at least in part on the slot number and the symbol number.
  • Aspect 9 The method of Aspect 8, wherein the pseudo-random sequence is initialized every N radio frames, and wherein N is greater than 1.
  • Aspect 10 The method of Aspect 9, wherein N is indicated in the configuration or wherein N is based at least in part on a subcarrier spacing.
  • Aspect 11 The method of any of Aspects 1-4, wherein the configuration indicates that the SRS resource is configured with group hopping and sequence hopping, and wherein transmitting the SRS in the SRS resource in accordance with the configuration of the SRS resource comprises: transmitting the SRS, in each of one or more symbols in which the SRS resource is configured, using a respective base sequence associated with a group index value and a sequence index value, wherein the group index value and the sequence index value are determined based at least in part on a number generated in accordance with a pseudo-random sequence based at least in part on a slot number and a symbol number.
  • Aspect 12 The method of Aspect 11, wherein the pseudo-random sequence is initialized every N radio frames, and wherein N is greater than 1.
  • Aspect 13 The method of Aspect 12, wherein N is indicated in the configuration or wherein N is based at least in part on a subcarrier spacing.
  • Aspect 14 The method of any of Aspects 1-13, wherein the configuration indicates at least one of a comb spacing for the SRS resource, a comb offset for the SRS resource, a cyclic shift for the SRS resource, an SRS sequence identity for the SRS resource, a group index value for the base sequence for the SRS resource, or whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 15 The method of Aspect 14, further comprising: receiving an indication of at least one of an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 16 The method of Aspect 15, wherein transmitting the SRS in the SRS resource comprises: transmitting the SRS in the SRS resource in accordance with the at least one of the updated comb spacing for the SRS resource, the updated comb offset for the SRS resource, the updated cyclic shift for the SRS resource, the updated SRS sequence identity for the SRS resource, the updated group index value for the base sequence for the SRS resource, or the update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 17 The method of any of Aspects 15-16, wherein the indication is included in downlink control information (DO) or a medium access control (MAC) control element (MAC- CE).
  • DO downlink control information
  • MAC- CE medium access control control element
  • Aspect 18 The method of Aspect 17, wherein the indication is included in DCI that triggers one or more SRS resource sets.
  • Aspect 19 The method of Aspect 17, wherein the indication is included in a MAC- CE that activates a semi -persistent SRS resource set that includes the SRS resource.
  • Aspect 20 The method of any of Aspects 17-19, wherein two or more of the an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource are jointly coded into a bit field of the DCI or the MAC-CE.
  • a method of wireless communication performed by a network entity comprising: transmitting a configuration of a sounding reference signal (SRS) resource for a user equipment (UE), wherein the configuration indicates a sequence index value for a base sequence for the SRS resource or the configuration indicates that the SRS resource is configured with group hopping and sequence hopping; and receiving an SRS in the SRS resource in accordance with the configuration of the SRS resource.
  • SRS sounding reference signal
  • Aspect 23 The method of Aspect 21 , wherein the configuration includes an indication of a sequence identity of the SRS resource, and wherein the sequence identity of the SRS resource indicates the sequence index value for the base sequence for the SRS resource.
  • Aspect 24 The method of any of Aspects 21-23, wherein the configuration of the SRS resource is included in a configuration of an SRS resource set including a plurality of SRS resources, and wherein the configuration of the SRS resource set indicates a respective sequence index value for each SRS resource of the plurality of SRS resources.
  • Aspect 25 The method of any of Aspects 21-24, wherein the configuration indicates the sequence index value and a group index value for the base sequence for the SRS resource, and wherein the configuration indicates that neither group hopping, nor sequence hopping, is configured for the SRS resource.
  • Aspect 26 The method of any of Aspects 21-24, wherein the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that group hopping is configured for the SRS resource.
  • Aspect 27 The method of any of Aspects 21-24, wherein the configuration indicates the sequence index value for the base sequence for the SRS resource and the configuration indicates that sequence hopping is configured for the SRS resource.
  • Aspect 28 The method of any of Aspects 21-24, wherein the configuration indicates that the SRS resource is configured with group hopping and sequence hopping.
  • Aspect 29 The method of Aspect 28, wherein the configuration indicates a number of frames associated with initializing a pseudo-random sequence for the group hopping and the sequence hopping, and wherein the number of frames is greater than 1.
  • Aspect 30 The method of any of Aspects 21-29, wherein the configuration indicates at least one of a comb spacing for the SRS resource, a comb offset for the SRS resource, a cyclic shift for the SRS resource, an SRS sequence identity for the SRS resource, a group index value for the base sequence for the SRS resource, or whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 31 The method of Aspect 30, further comprising: transmitting an indication of at least one of an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 32 The method of Aspect 31, wherein receiving the SRS in the SRS resource comprises: receiving the SRS in the SRS resource in accordance with the at least one of the updated comb spacing for the SRS resource, the updated comb offset for the SRS resource, the updated cyclic shift for the SRS resource, the updated SRS sequence identity for the SRS resource, the updated group index value for the base sequence for the SRS resource, or the update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 33 The method of any of Aspects 31-32, wherein the indication is included in downlink control information (DCI) or a medium access control (MAC) control element (MAC- CE).
  • DCI downlink control information
  • MAC- CE medium access control element
  • Aspect 34 The method of Aspect 33, wherein the indication is included in DCI that triggers one or more SRS resource sets.
  • Aspect 35 The method of Aspect 33, wherein the indication is included in a MAC- CE that activates a semi -persistent SRS resource set that includes the SRS resource.
  • Aspect 36 The method of any of Aspects 33-35, wherein two or more of the an updated comb spacing for the SRS resource, an updated comb offset for the SRS resource, an updated cyclic shift for the SRS resource, an updated SRS sequence identity for the SRS resource, an updated group index value for the base sequence for the SRS resource, or an update as to whether at least one of group hopping or sequence hopping is to be performed for the SRS resource are jointly coded into a bit field of the DCI or the MAC-CE.
  • a method of wireless communication performed by a user equipment comprising: receiving a configuration of parameters for a sounding reference signal (SRS) resource of an SRS resource set; receiving a dynamic indication of an updated value for at least one of the parameters for the SRS resource; and transmitting an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • SRS sounding reference signal
  • Aspect 38 The method of Aspect 37, wherein the at least one of the parameters for the SRS resource includes at least one of a comb spacing parameter, a comb offset parameter, a cyclic shift parameter, an SRS sequence identity, a group index value, or a parameter that indicates whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 39 The method of any of Aspects 37-38, wherein the dynamic indication is included in downlink control information (DCI) or a medium access control (MAC) control element (MAC-CE).
  • DCI downlink control information
  • MAC-CE medium access control control element
  • Aspect 41 The method of Aspect 39, wherein the SRS resource set is a semi- persistent SRS resource set, and wherein the dynamic indication is included in a MAC-CE that activates the SRS resource set.
  • Aspect 42 The method of any of Aspects 39-41, wherein the dynamic indication includes an indication, in a bit field of the DCI or the MAC-CE, that is jointly coded to indicate updated values for two or more of the parameters for the SRS resource.
  • a method of wireless communication performed by a network entity comprising: transmitting a configuration of parameters for a sounding reference signal (SRS) resource of an SRS resource set for a user equipment (UE); transmitting a dynamic indication of an updated value for at least one of the parameters for the SRS resource; and receiving an SRS in the SRS resource in accordance with the updated value for the at least one of the parameters for the SRS resource.
  • SRS sounding reference signal
  • Aspect 44 The method of Aspect 43, wherein the at least one of the parameters for the SRS resource includes at least one of a comb spacing parameter, a comb offset parameter, a cyclic shift parameter, an SRS sequence identity, a group index value, or a parameter that indicates whether at least one of group hopping or sequence hopping is to be performed for the SRS resource.
  • Aspect 45 The method of any of Aspects 43-44, wherein the dynamic indication is included in downlink control information (DCI) or a medium access control (MAC) control element (MAC-CE).
  • DCI downlink control information
  • MAC-CE medium access control control element
  • Aspect 46 The method of Aspect 45, wherein the indication is included in DCI that triggers one or more SRS resource sets.
  • Aspect 47 The method of Aspect 45, wherein the SRS resource set is a semi- persistent SRS resource set, and wherein the dynamic indication is included in a MAC-CE that activates the SRS resource set.
  • Aspect 48 The method of any of Aspects 45-47, wherein the dynamic indication includes an indication, in a bit field of the DCI or the MAC-CE, that is jointly coded to indicate updated values for two or more of the parameters for the SRS resource.
  • Aspect 49 An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of Aspects 1-20.
  • Aspect 50 A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 1-20.
  • Aspect 51 An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 1-20.
  • Aspect 52 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of Aspects 1-20.
  • Aspect 53 A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-20.
  • Aspect 54 An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of Aspects 21-36.
  • Aspect 55 A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 21-36.
  • Aspect 56 An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 21-36.
  • Aspect 57 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of Aspects 21-36.
  • Aspect 58 A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 21-36.
  • Aspect 59 An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of Aspects 37-42.
  • Aspect 60 A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 37-42.
  • Aspect 61 An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 37-42.
  • Aspect 62 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of Aspects 37-42.
  • Aspect 63 A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 37-42.
  • Aspect 64 An apparatus for wireless communication at a device, comprising a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more of Aspects 43-48.
  • Aspect 65 A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more of Aspects 43-48.
  • Aspect 66 An apparatus for wireless communication, comprising at least one means for performing the method of one or more of Aspects 43-48.
  • Aspect 67 A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more of Aspects 43-48.
  • Aspect 68 A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 43-48.
  • the term “component” is intended to be broadly construed as hardware and/or a combination of hardware and software.
  • “Software” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and/or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • a “processor” is implemented in hardware and/or a combination of hardware and software. It will be apparent that systems and/or methods described herein may be implemented in different forms of hardware and/or a combination of hardware and software. The actual specialized control hardware or software code used to implement these systems and/or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and/or methods are described herein without reference to specific software code, since those skilled in the art will understand that software and hardware can be designed to implement the systems and/or methods based, at least in part, on the description herein.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a + b, a + c, b + c, and a + b + c, as well as any combination with multiples of the same element (e.g., a + a, a + a + a, a + a + b, a + a + c, a + b + b, a + c + c, b + b, b + b + b, b + b + c, c + c, and c + c + c, or any other ordering of a, b, and c).
  • the terms “has,” “have,” “having,” or the like are intended to be open-ended terms that do not limit an element that they modify (e.g., an element “having” A may also have B). Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise. Also, as used herein, the term “or” is intended to be inclusive when used in a senes and may be used interchangeably with “and/or,” unless explicitly stated otherwise (e.g., if used in combination with “either” or “only one of’).

Abstract

Divers aspects de la présente divulgation portent d'une manière générale sur la communication sans fil. Selon certains aspects, un équipement utilisateur (UE) peut recevoir une configuration d'une ressource de signal de référence de sondage (SRS), la configuration indiquant une valeur d'index de séquence pour une séquence de base pour la ressource de SRS ou la configuration indiquant que la ressource SRS est configurée avec un saut de groupe et un saut de séquence. L'UE peut transmettre un SRS dans la ressource de SRS conformément à la configuration de la ressource de SRS. L'invention concerne de nombreux autres aspects.
PCT/US2023/062480 2022-02-25 2023-02-13 Atténuation d'interférence améliorée pour signal de référence de sondage WO2023164378A1 (fr)

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US18/167,621 US20230275737A1 (en) 2022-02-25 2023-02-10 Enhanced interference mitigation for sounding reference signal

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130329660A1 (en) * 2012-06-11 2013-12-12 Kt Corporation Transmission of uplink sounding reference signal
WO2014027803A2 (fr) * 2012-08-16 2014-02-20 주식회사 케이티 Procédé de commande d'émission de signal de référence de sondage de liaison montante, et appareil associé
US20190190669A1 (en) * 2017-05-01 2019-06-20 Lg Electronics Inc. Method of Sounding a Terminal in a Wireless Communication System and Apparatus Therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130329660A1 (en) * 2012-06-11 2013-12-12 Kt Corporation Transmission of uplink sounding reference signal
WO2014027803A2 (fr) * 2012-08-16 2014-02-20 주식회사 케이티 Procédé de commande d'émission de signal de référence de sondage de liaison montante, et appareil associé
US20190190669A1 (en) * 2017-05-01 2019-06-20 Lg Electronics Inc. Method of Sounding a Terminal in a Wireless Communication System and Apparatus Therefor

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