Techniques for dynamic adaptation of sounding reference signal time domain parameters

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may receive a sounding reference signal (SRS) configuration including SRS resources in a set of SRS resources. The SRS configuration includes one or more first time domain parameters of the SRS resources. The UE may receive a dynamic indication of one or more second time domain parameters of the SRS resources. At least a subset of the one or more second time domain parameters is modified from the one or more first time domain parameters included in the SRS configuration. The UE may transmit the SRS using the SRS resources based at least in part on the one or more second time domain parameters. Numerous other aspects are described.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 808,183, filed on June 22, 2022, entitled “TECHNIQUES FOR DYNAMICADAPTATION OF SOUNDING REFERENCE SIGNAL TIME DOMAIN PARAMETERS” and assigned to the assignee of this application. The disclosure of the prior application is considered a part of and incorporated by reference into this patent application. Technical Field

[0003] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for dynamic adaptation of sounding reference signal time domain parameters.

[0004] Related technologies

[0005] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such 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).

[0006] A wireless network may include one or more base stations that support communications for a user equipment (UE) or multiple UEs. A UE may communicate with a base station via downlink communications and uplink communications. A "downlink" (or "DL") refers to the communication link from a base station to a UE, and an "uplink" (or "UL") refers to the communication link from a UE to a base station.

[0007] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at a city, country, region and / or global level. New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with a cyclic prefix (CP) on the downlink, 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, and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. As the demand for mobile broadband access continues to increase, further improvements in LTE, NR and other radio access technologies remain useful. Summary of the invention

[0008] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include: receiving an SRS configuration of SRS resources included in a sounding reference signal (SRS) resource set, wherein the SRS configuration includes one or more first time domain parameters of the SRS resources. The method may include: receiving a dynamic indication of one or more second time domain parameters for the SRS resources, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration. The method may include: sending an SRS using the SRS resources based at least in part on the one or more second time domain parameters.

[0009] Some aspects described herein relate to a method for performing wireless communications by a network node. The method may include: sending an SRS configuration of SRS resources included in an SRS resource set to a UE, wherein the SRS configuration includes one or more first time domain parameters of the SRS. The method may include: sending a dynamic indication of one or more second time domain parameters of the SRS resources to the UE, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration. The method may include: receiving an SRS in the SRS resources from the UE and based at least in part on the one or more second time domain parameters.

[0010] Some aspects described herein relate to a UE for wireless communication. 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 an SRS configuration of an SRS resource included in an SRS resource set. The one or more processors may be configured to: receive a dynamic indication of one or more second time domain parameters of these SRS resources. The one or more processors may be configured to: send an SRS using these SRS resources based at least in part on the one or more second time domain parameters.

[0011] Some aspects described herein relate to a network node for wireless communication. The network node may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to: send an SRS configuration of SRS resources included in an SRS resource set to a UE. The one or more processors may be configured to: send a dynamic indication of one or more second time domain parameters of these SRS resources to the UE. The one or more processors may be configured to: receive an SRS in these SRS resources from the UE and at least partially based on the one or more second time domain parameters.

[0012] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a UE. The instruction set, when executed by one or more processors of the UE, may cause the UE to receive an SRS configuration for an SRS resource in an SRS resource set. The instruction set, when executed by one or more processors of the UE, may cause the UE to receive a dynamic indication of one or more second time domain parameters for the SRS resources. The instruction set, when executed by one or more processors of the UE, may cause the UE to send an SRS using the SRS resources based at least in part on the one or more second time domain parameters.

[0013] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for wireless communication by a network node. The instruction set, when executed by one or more processors of the network node, may cause the network node to send an SRS configuration of SRS resources included in an SRS resource set to a UE. The instruction set, when executed by one or more processors of the network node, may cause the network node to send a dynamic indication of one or more second time domain parameters of the SRS resources to the UE. The instruction set, when executed by one or more processors of the network node, may cause the network node to receive an SRS in the SRS resources from the UE and based at least in part on the one or more second time domain parameters.

[0014] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include: a component for receiving an SRS configuration of SRS resources included in an SRS resource set, wherein the SRS configuration includes one or more first time domain parameters of the SRS resources. The apparatus may include: a component for receiving a dynamic indication of one or more second time domain parameters of the SRS resource set, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration. The apparatus may include: a component for sending an SRS using the SRS resources based at least in part on the one or more second time domain parameters.

[0015] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include: a component for sending an SRS configuration of SRS resources included in an SRS resource set to a UE, wherein the SRS configuration includes one or more first time domain parameters of these SRS resources. The apparatus may include: a component for sending a dynamic indication of one or more second time domain parameters of these SRS resources to the UE, wherein at least a subset of the one or more second time domain parameters is modified from the one or more first time domain parameters included in the SRS configuration. The apparatus may include: a component for receiving an SRS in these SRS resources from the UE and based at least in part on the one or more second time domain parameters.

[0016] The various aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices and / or processing systems as fully described herein with reference to the accompanying drawings and description and as fully illustrated by the accompanying drawings and description.

[0017] The features and technical advantages of examples according to the present disclosure have been outlined quite extensively above so that the following specific embodiments may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the figures in the accompanying drawings is provided for the purpose of illustration and description and not as a definition of limitations to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order that the above-mentioned features of the present disclosure may be fully understood, a more specific description of the invention briefly summarized above may be obtained by reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are therefore not to be considered as limiting the scope thereof, as the specification may admit of other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0019] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0020] Figure 2 is a diagram illustrating an example of a base station communicating with a user equipment (UE) in a wireless network according to the present disclosure.

[0021] Figure 3 is an example of a disaggregated base station architecture according to the present disclosure.

[0022] Figure 4 is a diagram illustrating an example of physical channels and reference signals in a wireless network according to the present disclosure.

[0023] Figure 5 is a diagram illustrating an example of a sounding reference signal (SRS) resource set according to the present disclosure.

[0024] Figure 6 is a diagram of an example associated with dynamic adaptation of SRS time domain parameters according to the present disclosure.

[0025] 7A to 7F is a diagram of an example intra-time-slot time-domain SRS pattern configuration according to the present disclosure.

[0026] Figure 8 and Fig. 9 is a diagram illustrating an example process associated with dynamic adaptation of SRS time domain parameters according to the present disclosure.

[0027] Fig.10 and Fig.11 is a diagram of an example apparatus for wireless communications according to the present disclosure. DETAILED DESCRIPTION

[0028] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms, and should not be interpreted as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. It should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method that is practiced using other structures, functions, or structures and functions in addition to or different from the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims.

[0029] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0030] Although various aspects may be described herein using terms generally associated with 5G or new radio (NR) radio access technology (RAT), various aspects of the present disclosure may be applicable to other RATs, such as 3G RAT, 4G RAT and / or 5G and beyond (e.g., 6G) RATs.

[0031] Figure 11 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network or may include elements of a 5G (e.g., NR) network and / or elements of a 4G (e.g., Long Term Evolution (LTE)) network, among other examples. The wireless network 100 may include one or more base stations 110 (shown as BS110a, BS110b, BS110c, and BS110d), a user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other network entities. The base station 110 is an entity that communicates with the UE 120. Base station 110 (sometimes referred to as BS) 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 transmit receive point (TRP). Each base station 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP), the term "cell" may refer to a coverage area of ​​a base station 110 and / or a base station subsystem serving the coverage area, depending on the context in which the term is used.

[0032] 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., a radius of several kilometers) and may allow unrestricted access by UE 120 with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UE 120 with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UE 120 associated with the femto cell (e.g., UE 120 in a closed subscriber group (CSG)). 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 a home base station. In Figure 1 In the example shown, BS 110a may be a macro base station for macrocell 102a, BS 110b may be a pico base station for picocell 102b, and BS 110c may be a femto base station for femtocell 102c. A base station may support one or more (eg, three) cells.

[0033] In some examples, the cells may not necessarily be stationary, and the geographic area of ​​the cells may move depending on the location of the mobile base station 110 (e.g., a mobile base station). In some examples, the base stations 110 may be interconnected with each other and / or to one or more other base stations 110 or network nodes (not shown) in the wireless network 100 using any suitable transport network through various types of backhaul interfaces (such as direct physical connections or virtual networks).

[0034] As described herein, a node (which may be referred to as a "node", "network node", "network entity" or "wireless node") may include, may be, may be included in (e.g., as a component of) a base station (e.g., any base station described herein), a UE (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, an integrated access and backhaul (IAB) node, a distributed unit (DU), a central unit (CU), a remote unit (RU), and / or another suitable processing entity configured to perform any of the techniques described herein. For example, the network node may be a UE. For another example, the network node may be a base station or a network entity. For another example, the first network node may be configured to communicate with the second network node or the third network node. In one aspect of this example, the first network node may be a UE, the second network node may be a base station, and the third network node may be a UE. In another aspect of this example, the first network node may be a UE, the second network node may be a base station, and the third network node may be a base station. In other aspects of this example, the first network node, the second network node, and the third network node may be any other combination of devices or components. Similarly, references to UE, base station, device, equipment, computing system, etc. may include disclosure of UE, base station, device, equipment, computing system, etc. as a network node. For example, a disclosure that a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node. Consistent with the present disclosure, once a specific example is expanded according to the present disclosure (e.g., a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node), a broader example of a narrower example may be interpreted in reverse, but in a broad, open-ended manner. In the above example that a UE is configured to receive information from a base station also discloses that a first network node is configured to receive information from a second network node, "a first network node" may refer to a first UE, a first base station, a first device, a first device, a first computing system, a first one or more components, a first processing entity, etc. configured to receive information; and "a second network node" may refer to a second UE, a second base station, a second device, a second device, a second computing system, a first one or more components, a first processing entity, etc.

[0035] As described herein, different terms may be used in various aspects to describe the communication of information (e.g., any information, signal, etc.). Disclosure of one communication term includes disclosure of other communication terms. For example, a first network node may be described as being configured to send information to a second network node. In this example and consistent with the present disclosure, disclosure that the first network node is configured to send information to the second network node includes disclosure that the first network node is configured to provide, transmit, output, communicate, or send information to the second network node. Similarly, in this example and consistent with the present disclosure, disclosure that the first network node is configured to send information to the second network node includes disclosure that the second network node is configured to receive, obtain, or decode information provided, transmitted, output, communicated, or sent by the first network node.

[0036] The wireless network 100 may include one or more relay stations. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a base station 110 or a UE 120) and transmit transmissions of data to a downstream station (e.g., a UE 120 or a base station 110). A relay station may be a UE 120 that is capable of relaying transmissions for other UEs 120. Figure 1 In the example shown, BS 110d (eg, a relay base station) may communicate with BS 110a (eg, a macro base station) and UE 120d to facilitate communication between BS 110a and UE 120d. A base station 110 that relays communications may be referred to as a relay station, relay base station, relay, or the like.

[0037] The wireless network 100 may be a heterogeneous network including different types of base stations 110, such as macro base stations, pico base stations, femto base stations, relay base stations, etc. 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. For example, a macro base station may have a high transmit power level (e.g., 5 watts to 40 watts), while a pico base station, a femto base station, and a relay base station may have a lower transmit power level (e.g., 0.1 watt to 2 watts).

[0038] A network controller 130 may be coupled to or in communication with a set of base stations 110 and may provide coordination and control for the base stations 110. The network controller 130 may communicate with the base stations 110 via backhaul communication links. The base stations 110 may communicate directly with each other or indirectly via wireless or wired backhaul communication links.

[0039] UE 120 can be dispersed throughout wireless network 100, and each UE 120 can be stationary or mobile. UE 120 can include, for example, access terminals, terminals, mobile stations and / or subscriber units. UE 120 can 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 device, 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, etc.), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device and / or any other suitable device configured to communicate via a wireless or wired medium.

[0040] Some UEs 120 may be considered as machine type communication (MTC) UEs or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags that may communicate with a base station, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered as customer premises equipment. UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some examples, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0041] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. RAT may be referred to as a radio technology, air interface, etc. Frequency may be referred to as a carrier, frequency channel, etc. In a given geographic area, each frequency may support a single RAT to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0042] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more side link channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, or vehicle-to-pedestrian (V2P) protocols), and / or mesh networks. In such examples, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0043] The devices of the wireless network 100 may communicate using an electromagnetic spectrum that may be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, the devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands have been identified as frequency ranges designated 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 (interchangeably) referred to as the “below 6 GHz” band in various documents and articles. A similar naming issue sometimes occurs with respect to FR2, which is often (interchangeably) referred to as the “millimeter wave” band in documents and articles, although different from the extremely high frequency (EHF) band (30 GHz-300 GHz) identified as the “millimeter wave” band by the International Telecommunication Union (ITU).

[0044] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as frequency range designation FR3 (7.125GHz-24.25GHz). The bands falling within FR3 can inherit FR1 characteristics and / or FR2 characteristics, so the features of FR1 and / or FR2 can be effectively extended to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operations to more than 52.6GHz. For example, three higher operating bands have been identified as frequency range designations FR4a or FR4-1 (52.6GHz-71GHz), FR4 (52.6GHz-114.25GHz) and FR5 (114.25GHz-300GHz). Each of these higher frequency bands falls within the EHF band.

[0045] In view of the above examples, unless otherwise specifically stated, it should be understood that if the term "below 6 GHz" or the like is used herein, the term may broadly refer to frequencies that may be lower than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that if the term "millimeter wave" or the like is used herein, the term may broadly refer to 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. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0046] In some aspects, UE 120 may include communication manager 140. As described in more detail elsewhere herein, communication manager 140 may receive a sounding reference signal (SRS) resource set SRS configuration, wherein the SRS configuration includes one or more first time domain parameters of SRS resources included in the SRS resource set; receive a dynamic indication of one or more second time domain parameters of SRS resources linked to the SRS resource set, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and send the SRS using the SRS resources included in the SRS resource set based at least in part on the one or more second time domain parameters. Additionally or alternatively, communication manager 140 may perform one or more other operations described herein.

[0047] In some aspects, the base station 110 and / or another network node may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may send an SRS configuration of an SRS resource set to a UE, wherein the SRS configuration includes one or more first time domain parameters of the SRS resource set; send a dynamic indication of one or more second time domain parameters of the SRS resource set to the UE, wherein at least a subset of the one or more second time domain parameters is modified from the one or more first time domain parameters included in the SRS configuration; and receive an SRS from the UE and based at least in part on the one or more second time domain parameters in an SRS resource included in the SRS resource set. Additionally or alternatively, the communication manager 150 may perform one or more other operations described herein.

[0048] As indicated above, Figure 1 Other examples can be found in the Figure 1 The examples described are different.

[0049] Figure 22 is a diagram illustrating an example 200 of base station 110 communicating with UE 120 in wireless network 100 according to the present disclosure. Base station 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1).

[0050] At the base station 110, the transmit processor 220 may receive data intended for the UE 120 (or a set of UEs 120) from the data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCS) for the UE 120 based at least in part on one or more channel quality indicators (CQI) received from the UE 120. The base station 110 may process (e.g., encode and modulate) the data intended for the UE 120 based at least in part on the MCS selected for the UE 120, and 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., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., pre-coding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where 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 to 232t). For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may also process (e.g., convert to analog, amplify, filter, and / or up-convert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a to 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 to 234t).

[0051] At the UE 120, a set of antennas 252 (shown as antennas 252a through 252r) may receive 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). For example, each received signal may be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 may use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert, and / or digitize) the 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 MIMO detector 256 may obtain received symbols from the modem 254, may perform MIMO detection on the received symbols where applicable, and may provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, may provide decoded data destined for the UE 120 to the data sink 260, and may provide decoded control information and system information to the controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The 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 CQI parameter, among other things. In some examples, one or more components of the UE 120 may be included in the housing 284.

[0052] 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.

[0053] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or may be included within, one or more antenna panels, one or more antenna groups, one or more antenna element sets, and / or one or more antenna arrays, etc. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements (in a single housing or multiple housings), sets of coplanar antenna elements, sets of non-coplanar antenna elements, and / or may be coupled to one or more transmit and / or receive components (such as, Figure 2 One or more antenna elements of one or more components).

[0054] On the uplink, at the UE 120, the transmit processor 264 may receive and process data from the data source 262 and control information from the controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be pre-decoded by the TX MIMO processor 266, where applicable, further processed by the modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. The transceiver may be used by a processor (eg, controller / processor 280) and memory 282 to perform the functions described herein (eg, with reference to Figures 6 to 11 )Aspects of any of the methods described herein.

[0055] At the base station 110, uplink signals from the UE 120 and / or other UEs may be received by the antenna 234, processed by the modem 232 (e.g., a demodulator component of the modem 232, shown as DEMOD), detected by the MIMO detector 236 where applicable, and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and 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. In some examples, the modem 232 of the base station 110 may include a modulator and a demodulator. In some examples, the base station 110 includes a transceiver. The transceiver may include any combination of antenna 234, modem 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform operations described herein (e.g., with reference to Figures 6 to 11 )Aspects of any of the methods described herein.

[0056] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Figure 8 The process of 800 Fig. 9 900 and / or operations of other processes as described herein. Memory 242 and memory 282 may store data and program codes for base station 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, one or more instructions, when executed (e.g., directly or after compilation, conversion, and / or interpretation) by one or more processors of base station 110 and / or UE 120, may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example Figure 8 The process of 800 Fig. 9 The process 900 and / or operations of other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, etc.

[0057] In some aspects, the UE 120 includes: means for receiving an SRS configuration of SRS resources included in an SRS resource set, wherein the SRS configuration includes one or more first time domain parameters of the SRS resources; means for receiving a dynamic indication of one or more second time domain parameters of the SRS resources, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and / or means for transmitting an SRS using the SRS resources included in the SRS resource set based at least in part on the one or more second time domain parameters. The means for the UE 120 to perform the operations described herein may include, for example, one or more of the following: the communication manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0058] In some aspects, the base station 110 and / or another type of network node includes: means for sending an SRS configuration of SRS resources included in an SRS resource set to a UE, wherein the SRS configuration includes one or more first time domain parameters of the SRS resources; means for sending a dynamic indication of one or more second time domain parameters of the SRS resources to the UE, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and / or means for receiving an SRS in the SRS resources included in the SRS resource set from the UE and based at least in part on the one or more second time domain parameters. In some aspects, the means for the base station 110 to perform operations described herein may include, for example, one or more of the following: a communication manager 150, a transmit processor 220, a TX MIMO processor 230, a modem 232, an antenna 234, a MIMO detector 236, a receive processor 238, a controller / processor 240, a memory 242, or a scheduler 246.

[0059] Although Figure 2 The blocks in the 2000 and 2010 are illustrated as distinct components, but the functionality described above for these blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality 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.

[0060] As indicated above, Figure 2 Other examples can be found in the Figure 2 The examples described are different.

[0061] The deployment of a communication system (such as a 5G NR system) can be arranged in a variety of ways using various components or constituent parts. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a RAN node, a core network node, a network element or a network equipment (such as a base station (BS, e.g., base station 110), or one or more units (or one or more components) performing base station functionality can be implemented in an aggregated or decomposed architecture. For example, a BS (such as a Node B (NB), an eNB, an NR BS, a 5G NB, an access node (AP), a TRP, a cell, etc.) can be implemented as an aggregated base station (also referred to as a stand-alone BS or a monolithic BS) or a decomposed base station.

[0062] A converged base station may be configured to utilize a radio protocol stack physically or logically integrated within a single RAN node. A decomposed base station may be configured to utilize a protocol stack physically or logically distributed between two or more units, such as one or more central or centralized units (CUs), one or more distributed units (DUs), or one or more radio units (RUs). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed in one or more other RAN nodes. A DU may be implemented to communicate with one or more RUs. Each of a CU, a DU, and a RU may also be implemented as a virtual unit, i.e., a virtual centralized unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0063] Base station type operations or network designs may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be used in an integrated access backhaul (IAB) network, an O-RAN (such as a network configuration initiated by the O-RAN Alliance), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Decomposition may include distributing functionality across two or more units at various physical locations, as well as virtually distributing functionality of at least one unit, which may enable flexibility in network design. Individual units of a disaggregated base station or disaggregated RAN architecture may be configured for wired or wireless communication with at least one other unit.

[0064] Figure 3 is an example of a disaggregated base station architecture 300 according to the present disclosure. Figure 3 The disaggregated base station architecture 300 shown may include one or more CUs 310 that may communicate directly with a core network 320 via a backhaul link, or indirectly with a core network 320 through one or more disaggregated base station 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. The CU 310 may communicate with one or more DUs 330 via respective midhaul links, such as an F1 interface. The DU 330 may communicate with one or more RUs 340 via respective fronthaul links. The RU 340 may communicate with respective UEs 120 via one or more radio frequency (RF) access links. In some implementations, a UE 120 may be served simultaneously by multiple RUs 340.

[0065] Each of these units (e.g., CU 310, DU 330, RU 340), as well as near-RT RIC 325, non-RTRIC 315, and SMO framework 305 may include one or more interfaces or be coupled to one or more interfaces, which are configured to receive or send signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of these units or an associated processor or controller that provides instructions to the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface that is configured to receive or send signals to one or more of the other units via a wired transmission medium. Additionally, these units may include a wireless interface that may include a receiver, a transmitter, or a transceiver (such as an RF transceiver) that is configured to receive or send signals or both to one or more of the other units via a wireless transmission medium.

[0066] In some aspects, the CU 310 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface that is configured to communicate signals with other control functions hosted by the CU 310. The CU 310 may be configured to handle user plane functionality (e.g., central unit-user plane (CU-UP)), control plane functionality (e.g., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, the CU 310 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). If necessary, the CU 310 may be implemented to communicate with the DU 330 for network control and signaling.

[0067] DU 330 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RU 340. In some aspects, 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 (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) at least in part according to a functional split such as defined by the Third Generation Partnership Project (3GPP). In some aspects, DU 330 may further host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 330 or with control functions hosted by CU 310.

[0068] The lower layer functionality may be implemented by one or more RUs 340. In some deployments, the RU 340 controlled by the DU 330 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, etc.), or both, based on functional splitting such as lower layer functional splitting. In such an architecture, the RU 340 may be implemented to handle over-the-air (OTA) communications with one or more UEs 120. In some specific implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 340 may be controlled by the corresponding DU 330. In some scenarios, this configuration may enable the DU 330 and the CU 310 to be implemented in a cloud-based RAN architecture (such as a vRAN architecture).

[0069] The SMO framework 305 may be configured to support RAN deployment and configuration of non-virtualized network elements 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 operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 305 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 390) to perform network element lifecycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 310, DU 330, RU 340, and near-RT RIC 325. In some specific implementations, the SMO framework 305 may communicate with hardware aspects of the 4G RAN such as an open eNB (O-eNB) 311 via the O1 interface. Additionally, in some specific implementations, the SMO framework 305 may communicate directly with one or more RUs 340 via the O1 interface. The SMO framework 305 may also include a non-RT RIC 315 configured to support the functionality of the SMO framework 305 .

[0070] The non-RT RIC 315 may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, 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 the near-RT RIC 325 (such as via an A1 interface). The near-RT RIC 325 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 310, one or more DUs 330, or both, and the O-eNB with the near-RT RIC 325.

[0071] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 325, the non-RT RIC 315 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 325 and may be received from a non-network data source or from a network function at the SMO framework 305 or the non-RT RIC 315. In some examples, the non-RT RIC 315 or the near-RT RIC 325 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 315 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 305 (such as via reconfiguration of O1) or via creation of RAN management policies (such as A1 policies).

[0072] As indicated above, Figure 3 Other examples can be found in the Figure 3 The examples described are different.

[0073] Figure 4 4 is a diagram illustrating an example 400 of physical channels and reference signals in a wireless network according to the present disclosure. Figure 4 As shown, the downlink channel and the downlink reference signal may carry information from a network node (eg, as an example in conjunction with Figure 4 The uplink channel and the uplink reference signal may carry information from the UE 120 to the base station 110 .

[0074] As shown, the downlink channel may include a physical downlink control channel (PDCCH) carrying downlink control information (DCI), a physical downlink shared channel (PDSCH) carrying downlink data, or a physical broadcast channel (PBCH) carrying system information, etc. In some aspects, PDSCH communication may be scheduled by PDCCH communication. As further shown, the uplink channel may include a physical uplink control channel (PUCCH) carrying uplink control information (UCI), a physical uplink shared channel (PUSCH) carrying uplink data, or a physical random access channel (PRACH) for initial network access, etc. In some aspects, UE 120 may send confirmation (ACK) or negative confirmation (NACK) feedback (e.g., ACK / NACK feedback or ACK / NACK information) in the UCI on PUCCH and / or PUSCH.

[0075] As further shown in the figure, the downlink reference signal may include a synchronization signal block (SSB), a channel state information (CSI) reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), or a phase tracking reference signal (PTRS), etc. As also shown in the figure, the uplink reference signal may include a sounding reference signal (SRS), a DMRS, or a PTRS, etc.

[0076] The SSB may carry information used for initial network acquisition and synchronization, such as a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a PBCH, and a PBCH DMRS. The SSB is sometimes referred to as a synchronization signal / PBCH (SS / PBCH) block. In some aspects, the base station 110 may send multiple SSBs on multiple corresponding beams, and the SSBs may be used for beam selection.

[0077] The CSI-RS may carry information for downlink channel estimation (e.g., downlink CSI acquisition), which may be used for scheduling, link adaptation, or beam management, etc. The base station 110 may configure a CSI-RS set for the UE 120, and the UE 120 may measure the configured CSI-RS set. Based at least in part on these 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 channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a layer indicator (LI), a rank indicator (RI), or a reference signal received power (RSRP), etc. Base station 110 can use CSI reports to select transmission parameters for downlink communication to UE 120, such as the number of transmission layers (e.g., rank), precoding matrix (e.g., precoder), modulation and coding scheme (MCS), or refined downlink beams (e.g., using a beam refinement procedure or a beam management procedure), etc.

[0078] DMRS may carry information used to estimate the radio channel to demodulate the associated physical channel (e.g., PDCCH, PDSCH, PBCH, PUCCH, or PUSCH). The design and mapping of DMRS may be specific to the physical channel estimated using DMRS. DMRS is UE-specific, may be beamformed, may be restricted to scheduled resources (e.g., instead of being sent over a wideband), and may be sent only when necessary. As shown, DMRS is used for both downlink and uplink communications.

[0079] PTRS can carry information for compensating for oscillator phase noise. Typically, phase noise increases with the increase of the oscillator carrier frequency. Therefore, PTRS can be used at high carrier frequencies (such as millimeter wave frequencies) to mitigate phase noise. PTRS can be used to track the phase of the local oscillator and to achieve suppression of phase noise and common phase error (CPE). As shown, PTRS is used for both downlink communications (e.g., on PDSCH) and uplink communications (e.g., on PUSCH).

[0080] The PRS may carry information for implementing timing or ranging measurements of the UE 120 based on signals sent by the base station 110 to improve observed time difference of arrival (OTDOA) positioning performance. For example, the PRS may be a pseudo-random quadrature phase shift keying (QPSK) sequence mapped in a diagonal pattern with a frequency offset and a time offset to avoid conflicts with cell-specific reference signals and control channels (e.g., PDCCH). In general, the PRS may be designed to improve the detectability of the UE 120, which may require detecting downlink signals from multiple neighboring base stations in order to perform OTDOA-based positioning. Therefore, the UE 120 may receive PRS from multiple cells (e.g., a reference cell and one or more neighboring cells), and may report a reference signal time difference (RSTD) based on OTDOA measurements associated with the PRS received from the multiple cells. In some aspects, the base station 110 may then calculate the position of the UE 120 based on the RSTD measurements reported by the UE 120.

[0081] The SRS may carry a reference signal that may be used for uplink channel estimation, which may be used for scheduling, link adaptation, pre-decoder selection, or beam management, etc. The base station 110 may configure one or more SRS resource sets for the UE 120, and the UE 120 may send the SRS according to the configured SRS resource sets. The SRS resource sets may have configured uses, such as uplink CSI acquisition (e.g., codebook-based SRS type), downlink CSI acquisition for reciprocity-based operation (e.g., antenna switching SRS type), non-codebook-based SRS type for UE-assisted UL pre-coding and rank determination for reciprocity DL and UL channels, uplink beam management (e.g., beam management SRS type), etc. The base station 110 may measure the SRS, may perform channel estimation based at least on these measurements, and may use the SRS measurements to configure communications with the UE 120.

[0082] Reference signals may be used to improve the reliability and efficiency of communications between wireless devices. For example, base station 110 may measure uplink reference signals to select a configuration or other transmission parameters for communications between base station 110 and UE 120. For example, base station 110 may measure uplink reference signals to estimate delay spread, signal-to-noise ratio (SNR), and / or Doppler parameters (e.g., Doppler shift or Doppler spread) associated with an uplink channel, etc.

[0083] "Doppler shift" refers to the displacement or change of the signal frequency per spatial propagation path between the transmitter and the receiver. Doppler shift may sometimes be referred to as frequency offset (e.g., in the case of a LOS channel). For example, Doppler shift may occur when the transmitter of the signal moves relative to the receiver. The relative movement between the transmitter and the receiver on the spatial propagation path may cause the frequency of the signal receiver on this spatial path to shift, so that the frequency of the signal received at the receiver is different from the frequency of the signal sent at the transmitter. In other words, the frequency of the signal associated with the spatial propagation path received by the receiver is different from the frequency of the signal originally transmitted. "Doppler spread" refers to the widening of the spectrum of a narrowband signal transmitted through a multipath propagation channel. When there is relative motion between the transmitter and the receiver and / or some motion of the environment that generates the multipath channel, different Doppler shifts associated with multiple propagation paths of the channel between the transmitter and the receiver may cause Doppler spread. For example, when there is no relative motion between the transmitter and the receiver, due to the multipath propagation channel, the receiver may receive the same signal at different times because one copy of the signal uses a shorter path and arrives quickly, while another copy of the signal may use a longer path. When there is relative motion between the transmitter and the receiver, signals on different paths may arrive at the receiver at different times and at different frequencies (e.g., due to different Doppler shifts associated with each path). Doppler spread may be a measure of the frequency difference of the signals on the paths associated with a multipath propagation channel. Doppler spread may sometimes be referred to as a channel time correlation characteristic or a channel time coherence characteristic of a multipath propagation channel.

[0084] As indicated above, Figure 4 Other examples can be found in the Figure 4 The examples described are different.

[0085] Figure 5 is a diagram illustrating an example 500 of an SRS resource set according to the present disclosure. A network node (eg, in conjunction with Figure 5 The base station 110 may be depicted and described as configuring one or more SRS resource sets to the UE 120 to allocate resources for SRS transmission by the UE 120. For example, the configuration of the SRS resource set may be indicated in a radio resource control (RRC) communication (e.g., an RRC configuration communication or an RRC reconfiguration communication). As shown by reference numeral 505, the SRS resource set may include one or more resources (e.g., shown as SRS resources) that may be associated with or configured with different time resources and / or frequency resources (e.g., time slots, symbols, resource blocks, resource element subsets, and / or periodicity of time resources).

[0086] As shown by reference numeral 510, the SRS resources may be configured to be associated with one or more antenna ports on which the SRS will be sent (e.g., on corresponding time-frequency resources for each antenna port). Thus, the configuration of one or more SRS resources associated with or configured with an SRS resource set may indicate one or more time-frequency resources on which the SRS will be sent, and may indicate one or more antenna ports that will be used to send the SRS on these time-frequency resources. In some aspects, the configuration of the SRS resource set may indicate a use case of the SRS resource set (e.g., in an SRSResourceSet.Usage information element). For example, the SRS resource set may have use cases for antenna switching, codebook, non-codebook, or beam management.

[0087] The antenna switching SRS resource sets may be used to exploit reciprocity between uplink channels and downlink channels to determine downlink CSI. For example, when reciprocity exists between uplink channels and downlink channels, base station 110 may use antenna switching SRS (e.g., SRS sent using SRS resources configured under one or more antenna switching SRS resource sets) to obtain downlink CSI (e.g., to determine a downlink precoder and the number of spatial layers to be used for communication with UE 120).

[0088] When base station 110 evaluates and indicates to UE 120 an uplink precoder, number of spatial layers, and MCS for PUSCH based on uplink CSI, the uplink CSI may be determined using a codebook SRS resource set. For example, when base station 110 is configured to determine an uplink precoder to UE 120 from a set of predefined UL precoding options (e.g., using a precoder codebook), base station 110 may use a codebook SRS (e.g., an SRS sent using resources in a codebook SRS resource set) to obtain uplink CSI (e.g., to determine an uplink precoder, number of spatial layers, and MCS from the codebook to be used by the UE for PUSCH transmissions for indication to UE 120 and use by UE 120 for communicating with base station 110). In some aspects, a virtual port (e.g., a combination of two or more antenna ports for uplink precoding) that may be associated with a maximum received signal power or reception quality experienced by base station 110 may be used for the codebook SRS.

[0089] When UE 120 pre-selects one or more arbitrary uplink precoder candidate options, a non-codebook SRS resource set may be used to assist uplink CSI evaluation in the case of reciprocal uplink and downlink channels (e.g., instead of base station 110 autonomously evaluating uplink precoder candidates from the codebook and selecting one precoder candidate to explicitly indicate to UE 120 for uplink precoding). For example, when UE 120 is configured to send non-codebook based SRS, UE 120 may select one or more uplink precoder candidates based on downlink measurements, and the one or more uplink precoder candidates will be used for different SRS resource transmissions (e.g., precoded SRS will be transmitted, where each SRS resource will be associated with a different precoded UL layer according to the uplink precoder candidate). The base station 110 may use a non-codebook SRS (e.g., an SRS sent using resources of a non-codebook SRS resource set) to select one of the UE-selected precoder candidates, and obtain other uplink CSI parameters (rank and MCS) in view of the selected uplink precoder candidate. In this case, the uplink transmission parameters (e.g., precoding information) may be indicated to the UE 120 at least partially implicitly by the base station 110 based on the selected non-codebook SRS resources (e.g., via an SRS resource indicator (SRI)). The beam-managed SRS resource set may be used for uplink beam selection and / or evaluation (e.g., for mmWave communications) by the base station 110.

[0090] SRS resources may be configured as periodic, semi-persistent (sometimes referred to as semi-persistent scheduling (SPS), or aperiodic. Periodic SRS resources may be configured via a configuration message indicating the periodicity of the SRS resources (e.g., slot-level periodicity, where the SRS resources occur every Y slots) and a slot offset. A periodic SRS resource set may always be activated (e.g., transmitted) and may not be dynamically activated or deactivated. Semi-persistent SRS resources may also be configured via a configuration message indicating the periodicity and slot offset for the semi-persistent SRS resources and may be dynamically activated and deactivated (e.g., using DCI or a medium access control (MAC) control element (CE) (MAC-CE)). Aperiodic SRS resources may be dynamically triggered, such as via DCI (e.g., UE-specific DCI or group-common DCI).

[0091] In some examples, aperiodic SRS resources may be triggered via an SRS request field included in a DCI communication. For example, the SRS request field may include a value (e.g., a code point) associated with an SRS triggering state. "SRS triggering state" may refer to a configuration (e.g., an RRC configuration) of a list of one or more SRS resource sets that will be triggered by the DCI when the DCI (e.g., via an SRS request field in the DCI) indicates a specific SRS triggering state. The SRS triggering state may be an RRC configured by a network node (e.g., via one or more aperiodicSRS-ResourceTrigger parameters). Different SRS triggering states may be dynamically indicated or selected by the base station 110 via the DCI. For example, configuration information (e.g., RRC configuration information) may map or link each SRS triggering state to a code point of a DCI field (e.g., an SRS request field) or map or link to another indicator. Base station 110 may include a code point or indicator in the DCI (e.g., in the SRS request field) to dynamically trigger or select an SRS triggering state linked to or associated with an SRS resource set (or several SRS resource sets). In some examples, the configuration information may configure different SRS triggering states to be linked or associated with different SRS resource sets with different usage types (such as antenna switching, codebook, non-codebook, beam management, and / or positioning, etc.).

[0092] In some aspects, the UE 120 may be configured with a mapping between SRS ports (e.g., antenna ports) and corresponding SRS resources (e.g., which antenna ports will be used for each SRS resource). The UE 120 may use the SRS ports indicated in the configuration to send a specific SRS resource. In some aspects, the SRS resource may span N adjacent symbols within a time slot (e.g., where N is equal to 1, 2, or 4). The UE 120 may be configured with X SRS ports (e.g., where X=1, 2, 4). In some aspects, each of the X SRS ports may be mapped to a corresponding symbol of the SRS resource and used to send the SRS on that symbol.

[0093] like Figure 5As shown, in some aspects, different SRS resource sets (e.g., having different use cases) indicated to UE 120 may overlap with respect to associated SRS resources (e.g., may be configured with one or more identical SRS resource identifiers). For example, as shown by reference numeral 515, a first SRS resource set (e.g., shown as SRS resource set 1) is shown as having an antenna switching use case. As shown, the 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). Thus, antenna port 0 and antenna port 1 will be used to transmit antenna switching SRS according to or using SRS resource A configuration (e.g., a first time-frequency resource), and antenna port 2 and antenna port 3 will be used to transmit antenna switching SRS according to or using SRS resource B configuration (e.g., a second time-frequency resource).

[0094] As shown by reference numeral 520, a second SRS resource set (e.g., shown as SRS resource set 2) can be configured for a codebook use case or type. As shown, the example codebook SRS resource set includes only a first SRS resource (shown as SRS resource A). Therefore, the codebook SRS can be transmitted via antenna port 0 and antenna port 1 using SRS resource A configuration (e.g., a first time-frequency resource).

[0095] As described above, a network node (e.g., base station 110) may configure one or more SRS resource sets. For example, a network node may configure an SRS resource set that includes one or more frequency domain parameters (e.g., information or configuration indicating a position and / or pattern associated with an SRS resource linked to the SRS resource set in the frequency domain), one or more time domain parameters (e.g., information indicating a position and / or pattern associated with an SRS resource linked to the SRS resource set in the time domain), and / or one or more space domain parameters, etc. The time domain parameters may include one or more intra-time slot time domain pattern related parameters, one or more inter-time slot time domain pattern related parameters, and / or one or more time domain parameters of another type.

[0096] The time domain mode related parameters within a time slot may include, for example, a resource mapping starting position parameter (e.g., resourceMapping.startPosition parameter), a resource mapping symbol number parameter (e.g., resourceMapping.nrofSymbols parameter), and a resource mapping repetition factor parameter (e.g., resourceMapping.repetitionFactor parameter), etc. The time domain mode related parameters between time slots may include, for example, a periodicity and offset parameter (e.g., periodicityAndOffset-sp / p parameter), etc.

[0097] The resourceMapping.startPosition parameter can be used to indicate the first SRS symbol of the corresponding SRS resource, which can be located on any OFDM symbol (for example, for 3GPP Release 16 and above). The resourceMapping.nrofSymbols parameter can indicate the number of 1, 2, or 4 symbols that can be occupied by the corresponding SRS resource. All configured symbols can only be allocated on consecutive OFDM symbol indices. The resourceMapping.repetitionFactor parameter can indicate the number of repetitions within 1, 2, or 4 time slots on consecutive OFDM symbols defined by the first two parameters that can be configured for the corresponding SRS resource. SRS symbol repetition uses the same antenna port / beam and is sent on the same resource element (RE). The periodicityAndOffset-sp / p parameter defines the periodicity / semi-periodic (P / SP) SRS periodicity and the specific time slots in which P / SP SRS transmissions will be performed (for example, via a time slot offset configuration complementary to the periodicity). 3GPP Release 16 may allow configuration of up to 21 periodicity options (eg, periodicity from 1 slot to 81920 slots) and allow very fine granularity of dynamic periodicity adaptation.

[0098] As indicated above, Figure 5 Other examples can be found in the Figure 5 The examples described are different.

[0099] As described above, SRS may be used for uplink channel estimation, which in turn may be used by a network node for scheduling, link adaptation, pre-decoder selection or beam management, etc. In some wireless communication systems such as 5G NR wireless communication systems, UEs may include an increased number of antennas or antenna ports (e.g., compared to deployments of UEs associated with earlier wireless communication systems) to implement spatial precoding / beamforming, and / or increased uplink and / or downlink data capacity, etc. Therefore, SRS transmission may require an increased number of resources (e.g., time domain resources and / or frequency domain resources) because the UE may need to send multiple SRSs to a sound channel associated with each antenna, each antenna element, and / or each antenna panel associated with the UE.

[0100] Additionally, advances in wireless communication technology have enabled increases in cell capacity (e.g., the number of UEs that can be supported in a single cell) and in cell coverage (e.g., the geographic area associated with a single cell). As a result, the overhead associated with uplink channel estimation and / or SRS signaling has increased. For example, massive MIMO scenarios may be associated with increased overhead associated with uplink channel estimation (e.g., performed by a network node via SRS uplink transmissions). For example, a network node may need to perform simultaneous uplink channel estimation for multiple UEs (e.g., included in a group associated with coordinated scheduling). Furthermore, enhanced support for UE mobility (e.g., with limited degradation of quality of service for mobile UEs) may require increasing the rate at which channel estimation or updates are performed by a network node.

[0101] Therefore, the signaling overhead associated with SRS transmission (e.g., the number of time domain and / or frequency domain resources used for SRS transmission) may increase in such wireless communication systems to accommodate an increased number of UE antennas or antenna ports, increased cell capacity, increased cell coverage, and / or enhanced UE mobility support, etc. Therefore, the network (e.g., a network node) may need to allocate more resources (e.g., time domain resources and / or frequency domain resources) for SRS transmission that would otherwise be used for other uplink transmissions or downlink transmissions. This may reduce the throughput (or link capacity) associated with communications between the network (e.g., a network node) and the UE, or equivalently, the overall cell capacity may be limited due to the increased SRS overhead in the cell. Therefore, an intelligent tradeoff should be managed by the network (e.g., by a network node) for overall cell capacity optimization.

[0102] Different mobile UE terminals have different speeds, SNRs, channel characteristics, and locations (e.g., located at the cell edge or not at the cell edge) at different times. Channel estimation and tracking (e.g., channel refresh) requirements depend on the UE speed, UE SNR, and the number of layers used for UE transmission. Correspondingly, for different UE speeds, SNRs, and channel types, different time domain and / or frequency domain SRS patterns will ideally be required, so that on the one hand, the overall link quality of the UE will not be limited by the channel estimation and tracking accuracy, and on the other hand, unnecessary SRS allocations that consume uplink resources will be avoided. Therefore, the SRS resource allocation for the required uplink channel estimation (e.g., bandwidth, density in the frequency domain, allocation rate / periodicity in the time domain) can be based on UE speed, SNR, channel characteristics, and / or UE geographic location (e.g., whether the UE is close to the cell edge), etc. Correspondingly, the required SRS allocation and / or SRS signaling overhead associated with the uplink channel estimation can be dynamically determined and can change over time for a given UE. Thus, the amount of SRS resources required for a given UE (e.g., to be used by the UE to send SRS measured by the network node for uplink channel estimation) may change over time. In addition, the number of UEs within a cell (e.g., communicating with the network node) may change over time. Thus, different SRS configurations for the network (e.g., corresponding to different SRS overhead levels or thresholds) may be acceptable at different times (e.g., in a scenario where fewer UEs are connected to the network node, the network node may configure the connected UEs to send SRS using a higher SRS transmission amount and / or overhead or a larger bandwidth or a higher rate).

[0103] Given the above considerations, in order to be able to achieve the best compromise between SRS overhead and possible capacity increase and / or link quality per UE in the cell (e.g., due to increased SRS transmission volume), it would be beneficial to use a dynamic SRS mode per UE that is adaptive to UE speed, SNR, channel conditions, scheduling scenarios, and network load. Therefore, the SRS configuration can be dynamically determined by the network for different UEs over time. However, in some cases, the reconfiguration of one or more SRS resource sets for a UE may be a cumbersome and lengthy procedure. For example, in order to change the configuration of an SRS resource set, a network node may use an RRC reconfiguration procedure. Dynamic RRC-based SRS reconfiguration (e.g., which is associated with high latency and is not a synchronous procedure between the UE and the network) may not be a suitable option for "instant" dynamic reconfiguration.

[0104] For non-periodic SRS resource sets, although the non-periodic SRS resource sets may be dynamically triggered by a network node (e.g., in a DCI communication), the network node may use RRC reconfiguration between triggering events to change some SRS parameters including time domain and / or frequency domain resources or patterns associated with the non-periodic SRS resource sets, however this introduces scheduling restrictions on the non-periodic SRS during the time period that may be involved in the RRC reconfiguration procedure (e.g., in some cases, it may be hundreds of milliseconds). As described above, the RRC reconfiguration procedure is associated with high latency and is not synchronized (e.g., there may be ambiguity about the time when the UE and the network node will switch to use the new configuration indicated by the RRC reconfiguration). Therefore, dynamic RRC reconfiguration of the SRS resource set may not be practical. Therefore, the UE and the network node may communicate using an SRS resource set associated with a static configuration that is not optimized for the current cell condition or cell load, scheduling scenario, channel condition, and / or UE condition, etc. This may cause the UE to unnecessarily consume resources (eg, time domain resources and / or frequency domain resources) associated with transmitting SRS using static configurations (including frequency domain pattern configurations) associated with SRS resources and / or SRS resource sets.

[0105] Some techniques and apparatuses described herein implement dynamic adaptation and / or reconfiguration of SRS time domain parameters (e.g., configuration parameters associated with a time domain pattern indicating an SRS resource and / or an SRS resource set). In some aspects, a network node may configure an SRS resource set (e.g., and corresponding SRS resources) associated with one or more time domain parameters for a UE. For example, a network node may send and a UE may receive an SRS configuration associated with an SRS resource and / or an SRS resource set, the SRS configuration indicating information (e.g., values, index values, and / or other information) of a set of one or more time domain parameters associated with an SRS resource set (e.g., and corresponding SRS resources). A network node may send and a UE may receive a message indicating information (modified configuration, modified time domain parameters, and / or dynamic reconfiguration) of a subset of (e.g., one or more) time domain parameters associated with at least one SRS resource associated with an SRS resource set from a set of one or more time domain parameters (e.g., modified configuration, modified time domain parameters, and / or dynamic reconfiguration) (e.g., dynamic reconfiguration of time domain parameters may be based on each SRS resource or on each SRS resource set). In other words, the network node may send a message that dynamically modifies the configuration of one or more time domain parameters (e.g., RRC parameters) of an SRS resource set (e.g., and all related SRS resources) and / or individual SRS resources associated with the SRS resource set. The message may be a MAC-CE indication or a DCI communication, etc. The SRS resource set may be an aperiodic SRS resource set, a periodic SRS resource set, or a semi-persistent SRS resource set.

[0106] Therefore, the network node may be enabled to dynamically adapt or change one or more time domain parameters of the SRS resource set over time. For example, the network node may be enabled to dynamically adapt the time domain pattern or density associated with a given SRS resource set (SRS resource). Therefore, the network node and the UE may use SRS resources that do not have an optimized time domain configuration for the current cell condition or cell load, scheduling scenario, UE channel condition and / or UE condition, etc. to save resources (e.g., time domain resources) that would otherwise be associated with communicating the SRS.

[0107] The techniques described herein may enable network nodes and UEs to reduce SRS overhead (e.g., SRS periodicity) based on the mobility and / or Doppler spread, SNR, and multi-user MIMO (MU-MIMO) / single-user MIMO (SU-MIMO) scheduling of the UE. The techniques described herein may enable network nodes and UEs to utilize dynamic signaling of multiple SRS repetitions to improve SRS coverage (e.g., for cell edge UEs or UEs with very low SNRs). The techniques described herein may enable network nodes and UEs to support reliable and accurate SRS-based Doppler characteristic estimation in the uplink with minimal additional SRS overhead. Uplink and downlink efficiency improvements may be achieved by the ability to track accurate Doppler characteristics in the uplink (e.g., from Doppler knowledge on the network side). The techniques described herein may enable network nodes and UEs to improve SRS allocation and scheduling flexibility based on reconfigurable SRS symbol indexes and slot offsets of P / SP SRS. The techniques described herein may enable network nodes and UEs to improve scheduling flexibility of MU-MIMO based on dynamic reorganization of cooperative scheduling groups and corresponding SRS reconfigurations.

[0108] In addition, the dynamic time domain parameter adaptation technology described herein can provide new configuration options for codebook-based SRS types, non-codebook-based SRS types, and / or antenna switching SRS types to allow channel sounding and CSI estimation procedures to be combined with complementary Doppler characteristic estimation based on the same resources. According to the proposed method, the configuration of SRS resources can retain all existing configurability of SRS, while adding a new configuration combination of the number of SRS symbols (Ns) in a time slot on an arbitrary symbol index and the number of repetitions (R) on a subset of these SRS symbols / SRS symbols. In this way, a new time domain intra-slot SRS mode with an arbitrary time gap between two consecutive SRS symbols required for reliable Doppler characteristic estimation can be supported (which can be achieved through more flexible SRS configuration options). The new combination of the number of SRS symbols and the number of repetitions (via the ability to configure the arbitrary intra-slot time domain mode of SRS) enables excessive SRS repetitions (and corresponding increased overhead) to be avoided when combining the channel sounding procedure with the Doppler estimation capability based on the same resources.

[0109] Figure 6 6 is a diagram of an example 600 associated with dynamic adaptation of SRS time domain parameters according to the present disclosure. Figure 6 As shown, a network node 605 (e.g., base station 110, CU 310, DU 330, and / or RU 340, etc.) may communicate with a UE (e.g., UE 120). In some aspects, the network node 605 and the UE 120 may be part of a wireless network (e.g., wireless network 100). The UE 120 and the network node 605 may be in a Figure 6 The operations shown are performed after a wireless connection has been established.

[0110] As indicated by reference numeral 610, the network node 605 may send and the UE 120 may receive configuration information. In some aspects, the UE 120 may receive the configuration information via one or more of RRC signaling, one or more MAC-CEs, and / or DCI, etc. In some aspects, the configuration information may include an indication (e.g., an implicit indication) of one or more configuration parameters for selection by the UE 120 (e.g., a list of configuration options stored by the UE 120 and / or previously indicated by the network node 605 or another network device, or predefined by a specification or by some other means), and / or explicit configuration information for the UE 120 to configure the UE 120, etc. For example, the DU or CU may determine the configuration information, and the RU may send the configuration information to the UE 120. The DU or CU may send the configuration information to the RU.

[0111] In some aspects, the configuration information may include an SRS configuration. The SRS configuration may configure one or more SRS resources included in one or more SRS resource sets (e.g., in a manner similar to that described in more detail elsewhere herein). For example, the SRS configuration may configure an SRS resource set and / or one or more SRS resources associated with an SRS resource set. The SRS configuration may indicate (e.g., in an SRSResourceSet.Usage information element) a type of use associated with an SRS resource (e.g., an SRS resource set may be associated with a use case such as antenna switching, a codebook, a non-codebook, or beam management). Additionally or alternatively, the SRS configuration may indicate that the SRS resource set is a periodic SRS resource set, a semi-persistent SRS resource set, or an aperiodic SRS resource set. The SRS configuration may be an RRC configuration. For example, the network node 605 may send via RRC communication and the UE 120 may receive an indication of the SRS configuration via RRC communication. In some aspects, the configuration information may be indicated in part by another message. For example, for an aperiodic SRS resource set (and an aperiodic SRS resource included in an SRS resource set), the network node 605 may send a DCI triggering the aperiodic SRS resource set, wherein the DCI at least partially indicates configuration information. Similarly, the configuration information may be partially indicated by a MAC-CE indication (e.g., for a semi-persistent SRS resource).

[0112] In some aspects, the configuration information may indicate one or more SRS resource indicators. For example, the configuration information may indicate one or more SRS resource identifiers in an SRS-ResourceIDList information element. In some aspects, the configuration information may indicate multiple SRS resource identifiers (e.g., for each SRS resource associated with an SRS resource set). In some other aspects, the configuration information may indicate a single SRS resource identifier associated with multiple SRS symbols and ports.

[0113] The SRS configuration may indicate a time domain configuration and / or frequency domain configuration associated with an SRS resource set (e.g., and related SRS resources). For example, the SRS configuration may indicate information about a set of one or more time domain parameters associated with an SRS resource and / or an SRS resource set (e.g., configuration information, values, indexes, and / or code points, etc.). The information about a set of one or more time domain parameters may indicate a time domain configuration and / or a time domain mode associated with an SRS resource. For example, the information about a set of one or more time domain parameters may indicate time domain resources (e.g., time slots, the number of OFDM symbols used for SRS in a time slot and the indexes of these symbols, repetitions across two or more SRS symbols, and / or another type of time domain resources and parameters) that will be associated with one or more SRS resources and SRS transmissions.

[0114] For example, the set of one or more time domain parameters may include a resource mapping starting position parameter (e.g., resourceMapping.startPosition parameter), a resource mapping symbol number parameter (e.g., resourceMapping.nrofSymbols parameter), a resource mapping repetition factor parameter (e.g., resourceMapping.repetitionFactor parameter), and / or a periodicity and offset parameter (e.g., periodicityAndOffset-sp / p parameter), etc. In this way, the network node 605 may configure time domain information associated with an SRS resource set (e.g., and SRS resources associated with the SRS resource set).

[0115] Alternatively, other time domain parameters (e.g., different from those described above) may be used to allow support for new intra-slot time domain SRS patterns required for Doppler characteristic estimation that is complementary to the channel sounding / CSI estimation procedures and based on the same SRS resources. These alternative time domain parameters may provide more flexible SRS configuration options for codebook-based SRS, non-codebook-based SRS, antenna switching SRS, beam management SRS, and / or another SRS usage type to allow a combination of channel sounding and CSI estimation procedures with complementary Doppler characteristic estimation based on the same resources. These alternative time domain parameters may allow all existing configurability of SRS while providing new combinations of the number of SRS symbols (Ns) in a time slot at any symbol index and the number of repetitions (R) on a subset of these SRS symbols / SRS symbols. This allows new combinations that avoid excessive SRS repetitions (and correspondingly increased overhead) when combining channel sounding procedures with Doppler estimation capabilities based on the same resources. These alternative time domain parameters are applicable to any SRS resource listed under SRSResourceSet with any type of time behavior (e.g., periodic, semi-periodic, aperiodic) under any existing usage option. For beam-managed SRS, alternative time domain parameters may be used to configure the same time domain modes as those configurable with the above-described time domain parameters, but generally speaking, provide greater flexibility for future expansion (e.g., more consecutive repetitions, consecutive repetitions split in time).

[0116] An alternative time domain parameter may be indicated in a bitmap configuration that may be used to indicate the position of the SRS symbol within the time slot per SRS resource identifier. The bitmap parameter may have a size of 14 bits or another bit size. Each bit may refer to an OFDM symbol in an OFDM symbol of a time slot. A non-zero value or element of the bitmap (e.g., bit value = 1) may be used to indicate the position of the allocated SRS symbol. The number of non-zero elements in the bitmap may correspondingly implicitly indicate the number of SRS symbols of the addressed SRS resource. Alternatively, a zero value may be used to indicate the position of the allocated SRS symbol.

[0117] In a specific implementation using bitmap configuration, time domain parameters such as the first SRS symbol position per time slot (startPosition) and the number of SRS symbols per time slot (nrofSymbols) are not used. Any starting position and any Ns can be configured using a bitmap (thus, the bitmap is completely universal). The effective number of SRS symbols per time slot can be selected from the following extended option list: Ns=1,2,3,4, which includes the Ns=3 option in addition to the available options provided by the nrofSymbols parameter. In other words, the bitmap is able to indicate Ns that could not originally be indicated by the nrofSymbols parameter. The RRC parameter for the number of repetitions (repetitionFactor) can still be used, but additional repetition factor options such as R=3 can be added. However, the bitmap can be used to indicate the time gap between repetitions of the SRS. In particular, the bit distance between two non-zero valued bits in the bitmap may correspond to the time gap between two repetitions of the SRS in the SRS resource set. The bitmap can be used to indicate multiple (different) time gaps for multiple SRS repetitions in a flexible manner.

[0118] The addition of the Ns=3 and R=3 configuration options provides several special combinations, such as [Ns=3, R=2] and [Ns=4, R=3], which provide flexible selection of time domain parameters for implementing Doppler parameter estimation with minimal overhead (e.g., no excessive repetitions in the case of Ns=4, R=2), while still retaining intra-slot hopping functionality for these cases.

[0119] The network node 605 may determine the SRS configuration. For example, the base station, the CU, and / or the DU may determine the SRS configuration. In some aspects, the network node 605 may determine the SRS configuration based on at least carrier frequency, subcarrier spacing, deployment type, cell load, scheduling scenario, UE channel conditions (e.g., SNR, delay spread, and / or Doppler parameters), UE channel type, geographic location of the UE 120, and / or mobile information associated with the UE 120 (e.g., speed of the UE 120, acceleration of the UE 120, and / or direction of travel of the UE 120), etc. In some aspects, the network node 605 may adaptively determine the SRS configuration to optimize the time domain resources used by the UE 120 to send the SRS based on at least information at the time when the SRS configuration is sent to the UE 120 or at an earlier time (e.g., as described above).

[0120] UE 120 may configure UE 120 based at least on the configuration information. In some aspects, UE 120 may be configured to perform one or more operations described herein based at least on the configuration information.

[0121] In some aspects, the UE 120 may send and the network node 605 may receive a capability report. For example, the UE 120 may send a capability report to the RU. The RU may send an indication of the capability report to the DU. In some aspects, the capability report may indicate the UE's support for dynamically adopting configuration parameters of the SRS, as described in more detail elsewhere herein. For example, the capability report may indicate that the UE 120 is capable of dynamically adapting information or configuration of one or more time domain parameters associated with the SRS resources, as described in more detail elsewhere herein. In some aspects, the network node 605 may dynamically adapt one or more time domain parameters based at least on the capability report indicating that the UE 120 supports dynamic adaptation of time domain parameters associated with the SRS resource set, as described in more detail elsewhere herein.

[0122] In some aspects (e.g., for aperiodic SRS adaptation), as shown by reference numeral 615, the network node 605 may send and the UE 120 may receive a message to activate one or more SRS triggering states. For example, the configuration information (e.g., RRC configuration) may configure a set of SRS triggering states. For example, the UE 120 may receive an RRC configuration of multiple SRS triggering states associated with a given SRS resource set (e.g., a given aperiodic SRS resource set) from the network node 605. The multiple SRS triggering states may be associated with different corresponding configurations of a set of one or more time domain parameters of the SRS resources linked to the SRS resource set. The UE 120 may receive a MAC-CE indication (e.g., synchronous and low-latency signaling) to activate the one or more SRS triggering states from the network node 605. The MAC-CE indication may indicate an association (e.g., mapping) of the one or more SRS triggering states with a code point (e.g., index value) of the SRS request field of the DCI communication. In this way, by configuring and dynamically activating or deactivating multiple SRS triggering states associated with the same SRS resource set (e.g., for a non-periodic SRS resource set) but having different configurations of the SRS resource set, the network node 605 is enabled to dynamically adapt the time domain configuration to be used by the UE 120, which is associated with different triggering events sent by the non-periodic SRS resource set, as explained in more detail elsewhere in this document.

[0123] As indicated by reference numeral 620, the network node 605 may determine a modification of one or more time domain parameters associated with the SRS (e.g., one or more (or all) SRS resources associated with the SRS resource set). For example, the network node 605 may determine information of a modification of one or more (or all) time domain parameters from a set of one or more time domain parameters associated with the SRS resource set. In other words, the network node 605 may determine one or more modified time domain parameters having values ​​different from the time domain parameters indicated at 610. Alternatively, the modified information may include a modified SRS configuration or SRS reconfiguration including one or more different time domain parameters different from the time domain parameters indicated at 610.

[0124] In some aspects, the network node 605 may determine a modified time domain pattern to be associated with an SRS resource set (e.g., and associated SRS resources), a modified repetition factor to be associated with the SRS resource set, a modified SRS symbol position to be associated with the SRS resource set, a modified number of SRS symbols per SRS resource to be associated with the SRS resource set, and / or other modified time domain parameters to be associated with the SRS resource set.

[0125] In some aspects, the network node 605 may determine the modification and / or modified information based at least on some characteristics or information that have changed since the time the configuration information (e.g., SRS configuration) was sent to the UE 120. For example, the network node 605 may determine the modification and / or modified information based at least on the current SNR of the channel between the UE 120 and the network node 605, the channel type or channel delay spread characteristics or channel frequency response characteristics, the speed of the UE 120, the geographic location of the UE 120 (e.g., near the cell edge), the amount of data associated with the UE 120 (e.g., the amount or size of data communicated between the UE 120 and the network node 605), the number of UEs served by the network node 605, the co-scheduling determination (e.g., associated with uplink massive MIMO scenarios), the current NW load characteristics and / or the scheduling scheme / scenario of the UE, etc.

[0126] As indicated by reference numeral 625, the network node 605 (e.g., the base station 110 or the RU) may send, and the UE 120 may receive, a dynamic indication of one or more modified time domain parameters of the SRS resources in the SRS resource set. For example, rather than reconfiguring the SRS resources associated with the SRS set via an RRC reconfiguration procedure (e.g., which is asynchronous and has high latency), the network node 605 may dynamically adapt information of one or more (or all) time domain parameters associated with the SRS resource set (e.g., via dynamically reconfiguring the SRS resources), as described in more detail elsewhere herein.

[0127] One or more modified time domain parameters (e.g., time domain parameters that are dynamically adapted or modified for a periodic SRS resource set, a semi-persistent SRS resource set, or a non-periodic SRS resource set) may include a modified resource mapping starting position parameter (e.g., a modified resourceMapping.startPosition parameter), a modified resource mapping symbol number parameter (e.g., a modified resourceMapping.nrofSymbols parameter), a modified resource mapping repetition factor parameter (e.g., a modified resourceMapping.repetitionFactor parameter), and / or a modified periodicity and offset parameter (e.g., a modified periodicityAndOffset-sp / p parameter), etc.

[0128] Alternatively, one or more modified time domain parameters may be indicated in a bitmap in the dynamic indication. The bitmap may be used to indicate the number of SRS symbols in the modified time slot (e.g., modified Ns) and the modified positions of these symbols (with arbitrary time gaps between different SRS symbols), rather than what can be configured with the above-mentioned existing time domain parameters. In addition, the bitmap may be used to indicate the parameters of the SRS configuration itself.

[0129] In some aspects, a dynamic indication (e.g., indicating one or more modified time domain parameters) may be included in the MAC-CE indication. For example, the network node 605 may use a MAC-CE-based reconfiguration of time domain parameters of an SRS resource set and / or an SRS resource included in an SRS resource set (e.g., a periodic SRS resource set, a semi-persistent SRS resource set, or an aperiodic SRS resource set). The information indicated by the MAC-CE indication may be applicable to all SRS resources associated with the SRS resource set (e.g., the reconfiguration may be performed based on an SRS resource set identifier and may be applicable to all SRS resources listed under the indicated SRS resource set identifier). In some aspects, the information indicated by the MAC-CE indication may be applied by the UE 120 and / or the network node 605 a certain number of time slots (e.g., N time slots) after the UE sends a corresponding acknowledgement (ACK) message associated with the MAC-CE indication. For example, as shown by reference numeral 630, UE 120 may send an ACK message associated with the message, the ACK message indicating that UE 120 successfully decoded the communication (e.g., PDSCH) associated with the MAC-CE indication. UE 120 and / or network node 605 may apply the information of the modification of one or more time domain parameters of the SRS resource set a certain number (e.g., N) of time slots after the time slot in which the ACK message is sent. In some aspects, the information indicated by the MAC-CE indication may apply to one or more activated semi-persistent SRS resource sets (or SRS resources) and one or more inactivated semi-persistent SRS resource sets (or SRS resources).

[0130] In some aspects, the MAC-CE indication indicates one or more modified time domain parameters. In other words, the MAC-CE indication may explicitly indicate one or more modified time domain parameters of the SRS resource set. In some other aspects, the MAC-CE indication may implicitly indicate one or more modified time domain parameters of the SRS resource set. For example, the UE 120 may receive (e.g., in an RRC configuration and / or via configuration information) an indication of one or more time domain parameter sets associated with the SRS resource set. In other words, the network node 605 may configure one or more options of the time domain parameter set associated with the SRS resource set (e.g., several configuration options per SRS resource or SRS resource set identifier may be listed or preconfigured by the RRC configuration).

[0131] The MAC-CE indication may indicate or activate one set of time domain parameters associated with the SRS resource set (e.g., from a set or option configured by RRC). A subsequent MAC-CE indication may be used to modify the time domain parameters used by UE 120 by activating another set of time domain parameters (e.g., modified from previously activated time domain parameters). For example, the MAC-CE indication may activate a time domain parameter set that includes one or more time domain parameters that are modified relative to a currently (or previously) activated or semi-statically configured time domain parameter set for the SRS resource set.

[0132] In some aspects, one of the SRS configuration options for each SRS resource or SRS resource set identifier may be dynamically activated, selected, or indicated by a MAC-CE indication. The indicated option may become the active or used SRS configuration for the associated (MAC-CE indicated) SRS resource or SRS resource set until the next MAC-CE reactivation or indication. As described above, the UE 120 and / or the network node 605 may apply the information of the time domain parameters indicated by the information set activated by the MAC-CE message N time slots after the time slot in which the UE 120 sends an ACK message associated with the PDSCH allocation indicated by the MAC-CE (e.g., as described in conjunction with reference numeral 630).

[0133] In some aspects, one or more time domain parameter sets for an SRS resource set may be defined or otherwise determined by a wireless communication standard, such as 3GPP. For example, a default time domain parameter set (default configuration) for an SRS resource set may be defined by a wireless communication standard, or may be determined based on a standard-defined rule as a default configuration option that applies prior to any activation of a MAC-CE indication (e.g., to be used by the UE 120 prior to receiving a first MAC-CE indication indicating which information set from the RRC-configured options the UE 120 is to use). The MAC-CE indication may subsequently activate a different time domain parameter set, which may include one or more modified time domain parameters that are modified or different from the time domain parameters in the default time domain parameter set.

[0134] For example, the network node 605 may indicate a first configuration option, a second configuration option, and / or an additional configuration option for a given SRS resource set. The first configuration option may indicate a first bitmap that configures Ns=2 and has a time slot=5, a reconfiguration reset of R=2, and frequency hopping is disabled. The second configuration option may indicate a second bitmap that configures Ns=3 and has a time slot of 1 and 5, a repetitive configuration of R=3, and frequency hopping is disabled. The network node 605 may activate different configuration options for a given SRS resource set in different situations (e.g., via a MAC-CE indication). For example, the network node 605 may activate a first configuration option in the case of a limited Doppler spread and UE mobility scenario or a LOS type channel to allow reliable and accurate Doppler shift estimation. The network node 605 may activate a second configuration option in a high UE mobility scenario and a high delay spread channel that results in a high Doppler spread to allow for decoupled and reliable estimation of equivalent Doppler shift and channel Doppler spread / time correlation characteristics. In this way, the size of the MAC-CE indication may be reduced (eg, because the network node 605 may only need to indicate the configured options, rather than all information of the time domain parameters), while still enabling the network node 605 to dynamically adapt the time domain parameters of the SRS resource set.

[0135] In some other aspects, a dynamic indication of one or more modified time domains may be included in a DCI communication. In some aspects, the dynamic indication is included in a DCI communication that is not associated with a data transmission schedule (e.g., a DCI communication that does not schedule data transmission). A DCI communication that is not associated with a data transmission schedule may also be referred to as a "dummy DCI". In some aspects, a DCI communication may be associated with a DCI format 1_1 or a DCI format 1_2 (e.g., as defined by 3GPP or otherwise determined). For example, a non-data-scheduled DCI (e.g., using DCI format 1_1 or DCI format 1_2) may be used to indicate one or more modified time domain parameters for an SRS resource set. In some other aspects, a non-data-scheduled DCI communication may be associated with a dedicated DCI format that is associated with modifying SRS configuration parameters. For example, a DCI format associated with dynamic SRS parameter adaptation may be defined (e.g., by a wireless communication standard such as 3GPP).

[0136] In some aspects, a non-data-scheduled DCI communication may indicate one or more modified time domain parameters (e.g., in an explicit manner in which the DCI communication includes the modified information). In some other aspects, the DCI communication may implicitly indicate one or more modified time domain parameters. For example, a table with SRS configuration parameters may be indicated by the network node 605 (e.g., in an RRC configuration) and / or may be defined by a wireless communication standard such as 3GPP. The DCI communication may indicate an identifier (e.g., a row index and / or a column index) of a table to indicate one or more modified time domain parameters. The UE 120 may also identify information of modifications of one or more frequency domain parameters based at least on the identifier and the information indicated by the table.

[0137] The one or more modified time domain parameters indicated by the DCI communication may be associated with all SRS resources associated with the SRS resource set (e.g., may refer to a specific SRS resource set identifier). The UE 120 may acknowledge receipt of the modified information (e.g., reconfiguration) associated with the SRS resource set via an ACK message associated with the non-data-scheduled DCI communication. For example, as indicated by reference numeral 630, the UE 120 may send a corresponding ACK message indicating that the UE 120 successfully decoded the DCI communication (e.g., rather than indicating that the UE successfully decoded the corresponding scheduled PDSCH allocation as might otherwise be the case). The UE 120 and / or the network node 605 may apply the one or more modified time domain parameters of the SRS resource set a certain number of time slots (e.g., M time slots) after the time slot in which the UE 120 sent the ACK message. The one or more modified time domain parameters may overwrite the current RRC configuration of the one or more time domain parameters. The one or more modified time domain parameters indicated by the non-data scheduling DCI communication may be associated with one or more active semi-persistent SRS resource sets and / or one or more inactive (eg, unactivated) SP SRS resources and / or SRS resource sets.

[0138] In some aspects, for the dynamic adaptation of the time domain parameters of the aperiodic SRS resource set, the message may be included in a DCI communication that schedules the transmission of the aperiodic SRS resource set. For example, the dynamic adaptation of the time domain parameters of the aperiodic SRS resource set may be coupled with the aperiodic SRS resource set triggering procedure (e.g., may be performed based on the aperiodic SRS scheduling event). For example, the DCI communication may schedule the transmission of the aperiodic SRS resource set by indicating an SRS triggering state associated with or mapped to the aperiodic SRS resource set in the SRS request field of the DCI. In some aspects, the DCI communication does not schedule any UL data communication (e.g., the DCI communication may be a dummy DCI). For example, the DCI communication may be associated with a non-PUSCH scheduling format (e.g., a dummy DCI of format 0_1 ​​or format 0_2 as defined by 3GPP).

[0139] For example, the DCI communication may schedule the aperiodic SRS resource set (e.g., one or more aperiodic SRS resource sets may be scheduled) via the SRS triggering state indicated by the SRS request field. Additionally, the DCI communication may indicate one or more modified time domain parameters of the aperiodic SRS resource set via one or more other fields of the DCI communication. For example, one or more fields of the non-PUSCH scheduling format may be used to (e.g., explicitly or implicitly) indicate dynamic information of one or more time domain parameters. For example, a table with SRS configuration parameters may be indicated by the network node 605 (e.g., in an RRC configuration) and / or may be defined by a wireless communication standard such as 3GPP. The DCI communication may indicate an identifier of a table (e.g., a row index and / or a column index) (e.g., in one or more other fields of the DCI communication) to implicitly indicate one or more modified time domain parameters. For example, the DCI communication may indicate one or more indexes associated with a data structure including a plurality of SRS configuration options, and the one or more indexes may correspond to one or more modified time domain parameters. UE 120 may identify the one or more modified time domain parameters based at least on the identifier and the information indicated by the table.Alternatively, one or more other fields may indicate explicit information for the one or more modified time domain parameters.

[0140] The information indicated by the non-PUSCH scheduled DCI communication sent by the scheduling non-periodic SRS resource set may be applied to all SRS resources associated with the non-periodic SRS resource set. In some aspects, the SRS trigger state scheduling (e.g., indicated by the SRS request field of the DCI communication) includes multiple non-periodic SRS resource sets of the non-periodic SRS resource set. In some aspects, the DCI communication indicates the corresponding time domain parameter set for each non-periodic SRS resource set in the multiple triggered non-periodic SRS resource sets. For example, the information of the time domain parameter may be separately indicated for each SRS resource set identifier in the triggered or scheduled SRS resource set identifier. Alternatively, one or more modified time domain parameters may be associated with each non-periodic SRS resource set in the multiple non-periodic SRS resource sets. For example, the information of the time domain parameter may be collectively indicated for all triggered or scheduled non-periodic SRS resource set identifiers. For example, a single information set of time domain parameters may be applicable to all triggered or scheduled non-periodic SRS resource set identifiers.

[0141] In some other aspects, the DCI communication that schedules the aperiodic SRS resource set may schedule one or more data communications. For example, the DCI communication may be a PUSCH or PDSCH scheduled DCI communication (e.g., using DCI format 0_1, DCI format 0_2, DCI format 1_1, or DCI format 1_2, etc.). As described above in conjunction with reference numeral 615, UE 120 may receive an RRC configuration of multiple SRS triggering states associated with an SRS resource set, wherein the multiple SRS triggering states are associated with different corresponding configurations of time domain parameters of the SRS resource set. In other words, multiple SRS triggering states may be configured for the same aperiodic SRS resource set, wherein each of the multiple SRS triggering states is associated with a different time domain configuration of the same aperiodic SRS resource set. Because the DCI communication may schedule one or more data communications, there may be no additional field in the DCI to indicate information about one or more time domain parameters (e.g., in contrast to the case of non-data scheduled DCI communications). Thus, the network node 605 may configure several time domain configuration options for the same SRS resource set via the SRS triggering state to provide additional flexibility to dynamically adapt or modify the time domain allocation, density, and / or pattern associated with the SRS resource set. The DCI communication may indicate a triggered SRS triggering state associated with information or a modified configuration of a time domain parameter of an aperiodic SRS resource set (e.g., determined by the network node 605, as described in conjunction with reference numeral 620) from multiple SRS triggering states. For example, the SRS configuration option indicated via the scheduled SRS triggering state may override the RRC configuration (e.g., SRS configuration) of the triggered SRS resource or SRS resource set (e.g., the aperiodic SRS may be dynamically reconfigured based on a scheduling event).

[0142] For example, a first code point (e.g., 01) may be mapped to an SRS resource set and a first configuration option, a second code point (e.g., 10) may be mapped to an SRS resource set and a second configuration option, and a third code point (e.g., 11) may be mapped to an SRS resource set and a third configuration option. The network node 605 may indicate different code points in the SRS request field of the DCI communication to dynamically adapt the time domain configuration of a given aperiodic SRS resource set according to a scheduling event.

[0143] As described above in conjunction with reference numeral 615, in some cases, the network node 605 may activate one or more SRS triggering states from a larger number of RRC configured SRS triggering states (e.g., to reduce the number of activated triggering states, and correspondingly, to reduce the required SRS request field size in the DCI). The DCI communication may indicate an SRS triggering state from the list of activated SRS triggering states. For example, activating a subset of the configured SRS triggering states may achieve a smaller size of the SRS request field, or may enable the currently used SRS request field size to be maintained while also enabling configuration and dynamic activation or deactivation of additional SRS triggering states to allow dynamic SRS configuration adaptation by the network node 605.

[0144] Alternatively, a field of the data scheduling DCI communication of the extended or modified format may indicate an index associated with a time domain configuration and / or one or more time domain parameters associated with a non-periodic SRS resource set. For example, the field may explicitly indicate an index of a time domain configuration and / or one or more time domain parameters associated with a non-periodic SRS resource set of a triggered or scheduled non-periodic SRS resource set. The field may be a bit field. In some aspects, the field may have a size of log2(K), where K is the number (e.g., maximum number) of SRS configurations to be dynamically signaled for an SRS resource / SRS resource set.

[0145] In some aspects, as shown by reference numeral 630, the UE 120 may send and the network node 605 may receive an ACK message associated with a message indicating the modified and / or reconfigured time domain resource parameters of the SRS resource set. For example, the ACK message may be associated with a PDSCH allocation (e.g., which carries a MAC-CE indication). As described above, the ACK message may be associated with a DCI communication. The ACK message may indicate whether the UE 120 successfully received and / or decoded the message indicating the modified and / or reconfigured time domain resource parameters of the SRS resource set.

[0146] In some aspects, the UE 120 and / or the network node 605 may apply the modified and / or reconfigured time domain resource parameters of the SRS resource set a number of time slots (e.g., N time slots or M time slots) after the UE 120 sends the ACK message. Alternatively, the UE 120 and / or the network node 605 may apply the modified and / or reconfigured time domain resource parameters of the SRS resource set a number of time slots after the network node 605 sends a message indicating the modified and / or reconfigured time domain resource parameters of the SRS resource set. In some aspects, the network node 605 may also indicate one or more modified frequency domain parameters or spatial (antenna ports, quasi co-location) domain parameters that may be used by the UE 120 for dynamic SRS parameter adaptation.

[0147] As shown by reference numeral 635, using the modified or reconfigured information (reconfiguration) of one or more time domain parameters, the UE 120 may send and the network node 605 may receive one or more SRSs. For example, the UE 120 may send the SRS using one or more SRS resources included in the SRS resource set according to the modified information of the one or more time domain parameters.

[0148] Therefore, the network node 605 can be enabled to dynamically adapt or change one or more time domain parameters of the SRS resource set over time. For example, the network node 605 can be enabled to dynamically adapt to the time domain mode with a given SRS resource set. Therefore, the network node 605 and the UE 120 can use SRS resources that do not have an optimized time domain configuration for the current cell condition, UE channel condition and / or UE condition to save resources (e.g., time domain resources) originally associated with conveying SRS. Additionally, the network node 605 can dynamically adapt the SRS capacity (e.g., by multiplexing more or less SRS resources in the time domain) to serve additional UEs in the cell while maintaining the fixed SRS overhead in the cell. For example, RRC signaling overhead can be reduced because the SRS resource may not require RRC reconfiguration to adapt or adjust the time domain parameters of the SRS resource set. In addition, the network node 605 can improve SRS coverage (e.g., for mobile UEs, UEs near the cell edge, or UEs associated with low SNR conditions). Dynamic adaptation of time domain parameters of SRS resources may be associated with additional benefits as described in more detail elsewhere herein.

[0149] In some aspects, the dynamic time-domain parameter adaptation described herein for SRS may enable dynamic SRS periodicity adjustment based on the mobility / Doppler of UE 120. In cases of higher UE mobility, a higher rate of channel estimation / CSI updates will generally be required to keep the quality of service of UE 120 from degradation due to fast channel time-dependent fading and time-varying associated CSI mismatches limited. In cases where the channel allows a rank index (RI) greater than 1, the sensitivity to the channel sounding / CSI update rate in higher mobility scenarios will be increased (e.g., increased sensitivity to precoding matrix indicator (PMI) mismatches). For lower UE mobility / Doppler scenarios, a lower SRS periodicity will be sufficient so that SRS-based CSI updates will not be a limiting factor for link efficiency. When using a constant (e.g., RRC configured) periodicity of periodic / semi-periodic SRS, the network needs to target in advance some tradeoff between SRS overhead (which is a function of the periodicity) and performance degradation for UEs with medium / high SNR and mobility (e.g., significant CSI aging within a single SRS cycle time). In the event that the configured SRS periodicity is insufficient, the UE 120 and network node 605 will need to enforce a higher MCS backoff in the reported channel state feedback (CSF) or the evaluated CSI for link adaptation (LA). In some cases, the UE 120 and network node 605 may also reduce the applicable / reported / determined RI (e.g., to RI=1) to mitigate PMI mismatch-related sensitivity. The adaptive periodicity of P / SP SRS resources as a function of Doppler / UE mobility and UE SNR variations will allow UE 120 and network node 605 to maximize overall UE link efficiency and cell capacity to achieve an optimal tradeoff between SRS overhead and potential improvement in spectral efficiency of the UE link due to lower SRS periodicity as a function of Doppler and SNR variations.

[0150] In some aspects, the dynamic time domain parameter adaptation described herein for SRS may enable dynamic SRS periodicity adjustment based on MU-MIMO / SU-MIMO of UE 120. In the case of MU-MIMO, for MU-MIMO UEs, the channel sounding rate / CSI refresh requirements will be more sensitive to the mobility of the co-scheduled UEs. The impact of joint precoding mismatch for co-scheduled UEs is typically more significant than in the case of SU-MIMO. For this reason, UEs with mobility greater than a threshold are typically excluded from the MU-MIMO co-scheduling group. The (back and forth) transition of the UE from SU-MIMO to MU-MIMO based on UE mobility may be accompanied by SRS periodicity reconfiguration (for the same Doppler / mobility scenario, SU-MIMO has higher SRS periodicity and MU-MIMO has lower SRS periodicity). This approach will allow for improved SRS overhead in the cell.

[0151] In some aspects, the dynamic time domain parameter adaptation described herein for SRS may use dynamic SRS repetition to achieve SRS coverage enhancement. For cell edge UEs and / or UEs with very poor SNR conditions in the uplink, SRS repetition may be used to improve the accuracy of SRS-based channel sounding / CSI evaluation or maintain it at a desired level. This approach can only be efficient (without any excess SRS overhead) if dynamic reconfiguration of the SRS repetition factor is employed based on the UE SNR in the uplink.

[0152] In some aspects, the dynamic time domain parameter adaptation described herein for SRS may implement Doppler characteristic estimation based on SRS based on an adaptive time domain SRS pattern for UE 120. Knowledge of Doppler characteristics for each UE at the network node 605 is required for efficient link management and multiple related configuration and scheduling decisions at the network node 605, as well as enhanced uplink reception. These Doppler characteristics may include SRS / CSI-RS periodicity determination for a required CSI update rate, determination of the most convenient configuration of uplink and / or downlink DMRS (e.g., DMRS adaptation), MU-MIMO co-scheduling UE and group tracking, auxiliary information / assistance in uplink channel estimation, auxiliary information / assistance in downlink and / or uplink link adaptation, CSI prediction, and / or Doppler shift pre-compensation in downlink for multiple TRPs, etc.

[0153] The flexible intra-time domain mode option with dynamic time domain parameter adaptation described herein can achieve reliable and accurate Doppler characteristic estimation (including SRS-based estimation) in the uplink. The flexible intra-time domain mode option for SRS described herein is required to solve this problem. The robustness, accuracy and SRS overhead required to support Doppler estimation of Doppler estimation can be improved by dynamically adapting the time domain mode according to UE speed, channel type and according to the Doppler characteristics (e.g., Doppler shift and / or Doppler spread) as the measurement target. The rate of Doppler estimation may be lower than the rate of channel sounding / CSI update, or may be performed from time to time. This allows dynamic switching between two SRS modes (with and / or without support for Doppler estimation) to avoid sending additional SRS repetitions required to support Doppler characteristic estimation for each SRS occurrence.

[0154] As indicated above, Figure 6 Other examples can be found in the Figure 6 The examples described are different.

[0155] 7A to 7F is a diagram of a time domain SRS pattern configuration in an example time slot according to the present disclosure. 7A to 7F The example intra-slot time domain SRS pattern configuration (and other intra-slot time domain SRS pattern configurations) for dynamic adaptation of SRS time domain parameters, as described herein. A network node such as network node 605 (e.g., base station 110, CU 310, DU 330, and / or RU 340, etc.) may dynamically indicate to a UE (e.g., UE 120) 7A to 7F An example intra-slot time-domain SRS pattern configuration among the example intra-slot time-domain SRS pattern configurations (and other intra-slot time-domain SRS pattern configurations).

[0156] Fig. 7A An example intra-time domain SRS pattern configuration 705 is illustrated. This configuration can be performed using the alternative bitmap-based configuration method proposed previously, where the bitmap of the example intra-time domain SRS pattern configuration 705 can be configured as 00100001100001. The bitmap indicates the SRS symbol positions in multiple time slots for each SRS resource in the SRS resource set. Each bit in the bitmap corresponds to a corresponding OFDM symbol index associated with the SRS resource set in the time slot. Each OFDM symbol index corresponds to the position of the bit in the bitmap. For example, the first (leftmost) bit in the bitmap corresponds to OFDM symbol index 1, the second bit in the bitmap corresponds to OFDM symbol index 2, and so on.

[0157] A non-zero value in the bitmap indicates that SRS transmission is configured for the associated OFDM symbol index. In the example intra-slot time domain SRS pattern configuration 705, OFDM symbol indices 3, 8, 9, and 14 are scheduled for SRS transmission. Thus, the bitmap configures the number of SRS symbols in a slot to be Ns=4.

[0158] like Fig. 7A As further shown, assuming that in this example, in addition to the bitmap configuration for the SRS symbol position, a repetition factor of 2 is configured for the corresponding SRS resource, the example intra-slot time-domain SRS pattern configuration 705 includes two pairs of SRS symbols. Each SRS symbol pair corresponds to two repetitions (repetition factor (R) = 2). In addition, the bitmap configures the time gaps between the SRS symbols and the corresponding repetitions. For example, in the case of an R = 2 configuration coupled to the bitmap configuration, (due to the position of the SRS symbol in the bitmap) a time gap of 5 OFDM symbols will be configured between the SRS repetitions on the first pair of SRS symbols and the second pair of SRS symbols. . In addition, intra-slot frequency hopping is configured in the example intra-slot time-domain SRS pattern configuration 705, which enables each portion of the repeated SRS symbols (in this case, 2 repetitions) to be sent in different frequency resources according to the frequency hopping pattern. In the example intra-slot time-domain SRS pattern configuration 705, the same time gap is configured for the two SRS pairs that can be used for Doppler correlation estimation.

[0159] Figure 7B An example intra-time domain SRS pattern configuration 710 is illustrated. The bitmap of the example intra-time domain SRS pattern configuration 710 can be configured as 00000011100001. Therefore, the example intra-time domain SRS pattern configuration 710 is similar to the example intra-time domain SRS pattern configuration 705, except that, in the example intra-time domain SRS pattern configuration 710, different time slots are configured for two SRS pairs. The first SRS symbol pair is configured with time slot = 1, and the second SRS symbol pair is configured with time slot = 5. The first SRS symbol pair can be used for / facilitate Doppler shift estimation, and the second SRS symbol pair can be used for / facilitate Doppler correlation estimation. Therefore, the bitmap described herein implements a flexible time slot configuration of SRS symbols in a time slot and correspondingly SRS repetitions (when R>1 is configured).

[0160] Figure 7CAn example intra-time domain SRS pattern configuration 715 is illustrated. The bitmap of the example intra-time domain SRS pattern configuration 715 can be configured as 00100001000000. In the example intra-time domain SRS pattern configuration 715, it is assumed that the repetition factor 2 (R=2) configuration is complementary to the bitmap configuration, and correspondingly, this SRS configuration example results in 2 repeated SRS symbols for a time slot with 5 OFDM symbols. Therefore, the example time domain SRS pattern provided in 7C corresponds to the number of SRS symbols in a time slot configured as Ns=2, a complementary configuration of repetition factor (R)=2, and intra-time slot frequency hopping is not enabled. The bitmap enables configurations of up to 4 repetitions with different / flexible time slots to support Doppler characteristic estimation in different scenarios (including with and / or without intra-time slot frequency hopping). A single SRS symbol pair (spanning 2 repetitions of 2 configured SRS symbols) in the example intra-slot time-domain SRS pattern configuration 715 may be used for / facilitate, for example, Doppler correlation estimation.

[0161] Fig.7D An example intra-time domain SRS pattern configuration 720 is illustrated. The bitmap of the example intra-time domain SRS pattern configuration 720 may be configured as 00110001000000. In the example intra-time domain SRS pattern configuration 715, it is assumed that the repetition factor (R) = 3 is complementarily configured. Therefore, the example time domain pattern of 7D corresponds to a combination of the following configured (explicitly or implicitly configured) parameters: the above bitmap configuration configures the number of SRS symbols in the time slot to Ns = 3, complementarily configures the repetition factor (R) = 3, and does not enable intra-time slot frequency hopping. The bitmap enables configurations of up to 4 repetitions with different / flexible time slots to support Doppler characteristic estimation in different scenarios (including with and / or without intra-time slot frequency hopping). .For example, the time gap between the first repetition and the second repetition of the SRS is configured in the bitmap as time gap = 1 OFDM symbol (e.g., the SRS symbols for the first repetition and the second repetition are indicated by adjacent bits in the bitmap), and the time gap between the second repetition and the third repetition of the SRS is configured in the bitmap as time gap = 5 (e.g., the SRS symbols for the second repetition and the third repetition are indicated by bits spaced 4 bits apart in the bitmap). The SRS repetitions in the example intra-slot time domain SRS pattern configuration 720 can be used for Doppler correlation estimation and Doppler frequency shift estimation (the estimation of these two Doppler characteristics can be decoupled and based on two different repetitions of the SRS symbol, and the time gaps between different SRS repetitions can be optimized to support reliable and accurate Doppler characteristic estimation, and can be adaptively and flexibly configured according to the scenario using the proposed method).

[0162] Fig. 7EAn example intra-slot time domain SRS pattern configuration 725 is illustrated. The bitmap of the example intra-slot time domain SRS pattern configuration 725 may be configured as 00100001100000. In the example intra-slot time domain SRS pattern configuration 725, it is assumed that the Ns=3, R=2 combination is configured via the bitmap and R=2 combination. This is not a simple combination of Ns and R, and it cannot follow the same direct interpretation as the existing SRS configuration option that Ns should always be an integer multiple of R. Therefore, this configuration combination requires a complementary definition to interpret it. This combination may be interpreted as having 2 repetitions only on the first two SRS symbols in the bitmap, and no repetitions for the remaining third SRS symbol in the bitmap. In this case, intra-slot frequency hopping (first intra-slot frequency hopping for 2 repeated SRS symbols and second intra-slot frequency hopping for the remaining non-repeated SRS symbols) may be enabled, as assumed in the example intra-slot time domain SRS pattern configuration 725. The first two SRS symbols may be configured with time gap=5 and may be used for Doppler correlation estimation.The interpretation of this configuration (and other similar non-trivial configurations / combinations of configured parameters) may be defined in a specification or standard such as the 3GPP wireless communication standard.

[0163] Figure 7F An example intra-slot time domain SRS pattern configuration 730 is illustrated. The bitmap of the example intra-slot time domain SRS pattern configuration 730 may be configured as 00110001100000. In the example intra-slot time domain SRS pattern configuration 730, it is assumed that the Ns=4, R=3 combination is configured via the bitmap and R=3 combination. This combination may be interpreted as 3 repetitions only on the first three SRS symbols in the bitmap, and no repetitions for the remaining fourth SRS symbol in the bitmap. Similar to the example of 7E, in this case, intra-slot frequency hopping (first intra-slot frequency hopping for 3 repeated SRS symbols and second intra-slot frequency hopping for the remaining non-repeated SRS symbols) may be enabled, as assumed in the example intra-slot time domain SRS pattern configuration 730. The first three SRS symbols may be configured with multiple different time slots (or alternatively, multiple time slots of the same size). For example, the time slot between the first repetition and the second repetition may be time slot=1, and the time slot between the second repetition and the third repetition may be time slot=5. The repetition in the first three SRS symbols may be used for Doppler correlation estimation and Doppler shift estimation (to be done only on the first hop). The interpretation of this configuration (and other similar non-trivial configurations / combinations of configured parameters) may be defined in a specification or standard such as the 3GPP wireless communication standard.

[0164] As indicated above, 7A to 7F Other examples can be found in the 7A to 7F The examples described are different.

[0165] Figure 8 is a diagram illustrating an example process 800 performed, for example, by a UE according to the present disclosure. Example process 800 is an example in which a UE (eg, UE 120) performs operations associated with dynamic adaptation of SRS time domain parameters.

[0166] like Figure 8 As shown, in some aspects, process 800 may include: receiving an SRS configuration for an SRS resource included in an SRS resource set, wherein the SRS configuration includes one or more first time domain parameters for the SRS resource (block 810). For example, a UE (e.g., using Fig.10 The depicted communication manager 140 and / or receiving component 1002) can receive an SRS configuration of SRS resources included in an SRS resource set, as described herein. In some aspects, the SRS configuration includes one or more first time domain parameters of the SRS resources.

[0167] like Figure 8 As further shown, in some aspects, process 800 may include receiving a dynamic indication of one or more second time domain parameters for an SRS resource, wherein at least a subset of the one or more second time domain parameters are modified from one or more first time domain parameters included in an SRS configuration (block 820). Fig.10 The depicted communication manager 140 and / or receiving component 1002) may receive a dynamic indication of one or more second time domain parameters for the SRS resources, as described herein. In some aspects, at least a subset of the one or more second time domain parameters are modified from one or more first time domain parameters included in the SRS configuration.

[0168] like Figure 8 As further shown, in some aspects, process 800 may include: transmitting the SRS using the SRS resource based at least in part on the one or more second time domain parameters (block 830). Fig.10 The depicted communication manager 140 and / or transmitting component 1004) can transmit the SRS using the SRS resources based at least in part on one or more second time domain parameters, as described herein.

[0169] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0170] In a first aspect, the SRS includes a periodic SRS, a semi-persistent SRS, or an aperiodic SRS.

[0171] In a second aspect, alone or in combination with the first aspect, the one or more second time domain parameters include at least one of one or more intra-slot time domain pattern related parameters or one or more inter-slot time domain pattern related parameters.

[0172] In a third aspect, either alone or in combination with one or more of the first and second aspects, the dynamic indication of one or more second time domain parameters comprises a bitmap indicating SRS symbol positions within multiple time slots of an SRS resource, wherein the one or more first time domain parameters are indicated in another bitmap in the SRS configuration.

[0173] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, each bit in the bitmap corresponds to a corresponding OFDM symbol associated with an SRS resource in a time slot, wherein SRS symbol positions within multiple time slots of the SRS resource correspond to associated OFDM symbol indices based on positions in the bitmap of non-zero valued bits associated with the SRS symbol positions within the multiple time slots.

[0174] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the bitmap indicates non-uniform time intervals of SRS symbol positions within multiple time slots of an SRS resource, and the non-uniform time intervals can be arbitrarily configured.

[0175] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the bitmap indicates three intra-slot SRS symbol positions from a plurality of intra-slot SRS symbol positions of an SRS resource.

[0176] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, SRS symbol positions within three time slots are configured for three SRS transmissions.

[0177] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the one or more second time domain parameters include at least one of: a modified starting position of a first SRS symbol of an SRS resource, a modified number of symbols that can be occupied by an SRS resource, or a modified periodicity and time slot offset of the SRS.

[0178] In the ninth aspect, alone or in combination with one or more of aspects 1 to 8, the SRS configuration is indicated in the RRC communication, and one or more second time domain parameters are indicated in a dynamic control signaling indication, which includes at least one of a MAC-CE indication or a DCI indication.

[0179] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, the SRS includes at least one of a codebook-based SRS, a non-codebook-based SRS, or an antenna switching SRS, and one or more second time domain parameters enable the channel sounding and CSI estimation procedures to be combined with complementary Doppler characteristic estimation based on the same resources.

[0180] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the MAC-CE indication includes a MAC-CE based reconfiguration indication, wherein one or more second time domain parameters are explicitly indicated in the MAC-CE based reconfiguration indication.

[0181] In the twelfth aspect, alone or in combination with one or more aspects from the first to the eleventh aspects, the SRS configuration includes a first SRS configuration, which is included in multiple SRS configurations configured for the UE and associated with an SRS resource set, wherein the multiple SRS configurations are indicated in the RRC communication, wherein the first MAC-CE indicates activation of the first SRS configuration, and wherein the MAC-CE indication includes a second MAC-CE indication, which indicates a second SRS configuration among the multiple SRS configurations, wherein one or more second time domain parameters are indicated in the second SRS configuration.

[0182] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the dynamic control signaling communication includes a non-PDSCH scheduled DCI communication having format 1_1 or format 1_2.

[0183] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the one or more second time domain parameters are explicitly indicated by one or more repurposed DCI bit fields in the DCI communication.

[0184] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, one or more second time domain parameters are implicitly indicated in the DCI communication.

[0185] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the dynamic control signaling communication comprises a non-scheduled DCI communication having a dedicated format dedicated for dynamic SRS parameter indication.

[0186] In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the dynamic control signaling communication includes a non-PUSCH scheduled DCI communication having format 0_1 ​​or format 0_2, wherein one or more second time domain parameters are indicated by one or more repurposed DCI bit fields in the DCI communication.

[0187] In the eighteenth aspect, alone or in combination with one or more aspects from the first to the seventeenth aspects, the dynamic control signaling communication includes a PUSCH or PDSCH scheduled DCI communication, which triggers the transmission of a non-periodic SRS associated with a non-periodic SRS resource set.

[0188] In the nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, one or more second time domain parameters are associated with or indicated by a triggered SRS trigger state indicated by a corresponding DCI field in a scheduling DCI communication, wherein the DCI field conveys a code point linked to an SRS trigger state associated with a non-periodic SRS resource set, wherein the SRS trigger state is included among multiple SRS trigger states associated with the SRS resource set, and wherein each SRS trigger state of the multiple SRS trigger states is associated with a corresponding SRS configuration.

[0189] In the twentieth aspect, alone or in combination with one or more of aspects one to nineteen, process 800 comprises: receiving a MAC-CE communication that activates a non-periodic SRS triggering state from a plurality of SRS triggering states associated with a non-periodic SRS resource set, wherein one or more of the plurality of SRS triggering states are associated with different SRS configurations, wherein scheduling DCI communication triggers the sending of SRS based at least in part on the non-periodic SRS triggering state, and wherein the SRS comprises a non-periodic SRS.

[0190] In a twenty-first aspect, alone or in combination with one or more of the first to twentieth aspects, the dynamic control signaling communication includes an indication of one or more modified frequency domain parameters associated with the SRS resource set.

[0191] although Figure 8 An example block diagram of process 800 is shown, but in some aspects, process 800 may include Figure 8 The blocks depicted may be additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted. Additionally or alternatively, two or more of the blocks of process 800 may be performed in parallel.

[0192] Fig. 9is a diagram illustrating an example process 900, for example, performed by a network node according to the present disclosure. Example process 900 is where a network node (eg, base station 110, CU 310, DU 330, RU 340, network node 605) performs operations associated with dynamic adaptation of SRS time domain parameters.

[0193] like Fig. 9 As shown, in some aspects, process 900 may include: sending an SRS configuration of SRS resources included in an SRS resource set to a UE, wherein the SRS configuration includes one or more first time domain parameters of the SRS resources (block 910). For example, a network node (e.g., using Fig.11 The depicted communication manager 150 and / or transmitting component 1104) can transmit to the user UE an SRS configuration of SRS resources included in an SRS resource set, as described herein. In some aspects, the SRS configuration includes one or more first time domain parameters of the SRS resources.

[0194] like Fig. 9 As further shown, in some aspects, process 900 may include sending a dynamic indication of one or more second time domain parameters for SRS resources to the UE, wherein at least a subset of the one or more second time domain parameters are modified from one or more first time domain parameters included in the SRS configuration (block 920). For example, a network node (e.g., using Figure 1 The depicted communication manager 150 and / or transmitting component 1104) may transmit a dynamic indication of one or more second time domain parameters for the SRS resources to the user UE, as described herein. In some aspects, at least a subset of the one or more second time domain parameters are modified from one or more first time domain parameters included in the SRS configuration.

[0195] like Fig. 9 As further shown, in some aspects, process 900 may include receiving an SRS in an SRS resource from a UE and based at least in part on one or more second time domain parameters (block 930). Fig.11 The depicted communications manager 150 and / or receiving component 1102) can receive an SRS in the included SRS resources from a UE and based at least in part on one or more second time domain parameters, as described above.

[0196] Process 900 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0197] In a first aspect, the SRS includes a periodic SRS, a semi-persistent SRS, or an aperiodic SRS.

[0198] In a second aspect, alone or in combination with the first aspect, the one or more second time domain parameters include at least one of one or more intra-slot time domain pattern related parameters or one or more inter-slot time domain pattern related parameters.

[0199] In a third aspect, alone or in combination with one or more of the first and second aspects, the dynamic indication of the one or more second time domain parameters comprises a bitmap indicating SRS symbol positions within a plurality of time slots of the SRS resource.

[0200] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, each bit in the bitmap corresponds to a corresponding OFDM symbol associated with an SRS resource in a time slot, wherein SRS symbol positions within multiple time slots of the SRS resource correspond to associated OFDM symbol indices based on positions in the bitmap of non-zero valued bits associated with the SRS symbol positions within the multiple time slots.

[0201] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, a bitmap indicates non-uniform time intervals of SRS symbol positions within multiple time slots in an SRS resource, and the non-uniform time intervals can be arbitrarily configured.

[0202] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the bitmap indicates three intra-slot SRS symbol positions from a plurality of intra-slot SRS symbol positions of an SRS resource.

[0203] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, SRS symbol positions within three time slots are configured for three SRS transmissions.

[0204] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the one or more second time domain parameters include at least one of: a modified starting position of a first SRS symbol of an SRS resource, a modified number of symbols that can be occupied by an SRS resource, or a periodicity of the SRS modification.

[0205] In the ninth aspect, alone or in combination with one or more of aspects 1 to 8, the SRS configuration is indicated in an RRC communication, and one or more second time domain parameters are indicated in a dynamic control signaling indication, which is included in at least one of a MAC-CE indication or a DCI communication.

[0206] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, the SRS includes at least one of a codebook-based SRS, a non-codebook-based SRS, or an antenna switching SRS, and one or more second time domain parameters enable the channel sounding and CSI estimation procedures to be combined with complementary Doppler characteristic estimation based on the same resources.

[0207] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the MAC-CE indication includes a MAC-CE based reconfiguration indication, wherein one or more second time domain parameters are explicitly indicated in the MAC-CE based reconfiguration indication.

[0208] In the twelfth aspect, alone or in combination with one or more aspects from the first to the eleventh aspects, the SRS configuration includes a first SRS configuration, which is included in multiple SRS configurations configured for the UE and associated with an SRS resource set, wherein the multiple SRS configurations are indicated in the RRC communication, wherein the first MAC-CE indication activates the first SRS configuration, wherein the MAC-CE indication includes a second MAC-CE indication, which indicates a second SRS configuration among the multiple SRS configurations, and wherein one or more second time domain parameters are indicated in the second SRS configuration.

[0209] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the dynamic control signaling communication includes a non-PDSCH scheduled DCI communication having format 1_1 or format 1_2.

[0210] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the one or more second time domain parameters are explicitly indicated by one or more repurposed DCI bit fields in the DCI communication.

[0211] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, one or more second time domain parameters are implicitly indicated in the DCI communication.

[0212] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the dynamic control signaling communication comprises a non-scheduled DCI communication having a dedicated format dedicated for dynamic SRS parameter indication.

[0213] In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the dynamic control signaling communication includes a non-PUSCH scheduled DCI communication having format 0_1 ​​or format 0_2, wherein one or more second time domain parameters are indicated by one or more repurposed DCI bit fields in the DCI communication.

[0214] In the eighteenth aspect, alone or in combination with one or more aspects from the first to the seventeenth aspects, the dynamic control signaling communication includes a PUSCH or PDSCH scheduled DCI communication, which triggers the transmission of a non-periodic SRS associated with a non-periodic SRS resource set.

[0215] In the nineteenth aspect, alone or in combination with one or more aspects of the first to eighteenth aspects, one or more second time domain parameters are associated with or indicated by a triggered SRS trigger state indicated by a corresponding DCI field in a scheduling DCI communication, wherein the DCI field conveys a code point linked to an SRS trigger state associated with a non-periodic SRS resource set, wherein the SRS trigger state is included among multiple SRS trigger states associated with the non-periodic SRS resource set, and wherein each SRS trigger state of the multiple SRS trigger states is associated with a corresponding SRS configuration.

[0216] In the twentieth aspect, alone or in combination with one or more of aspects one to nineteen, process 900 comprises: receiving a MAC-CE communication, which activates a non-periodic SRS triggering state from a plurality of SRS triggering states associated with a non-periodic SRS resource set, wherein one or more of the plurality of SRS triggering states are associated with different SRS configurations, wherein scheduling DCI communication triggers the sending of SRS based at least in part on the non-periodic SRS triggering state, and wherein the SRS comprises a non-periodic SRS.

[0217] In a twenty-first aspect, either alone or in combination with one or more of the first to twentieth aspects, the dynamic control signaling communication comprises a dynamic indication of one or more modified frequency domain parameters associated with the SRS resource set.

[0218] although Fig. 9 An example block diagram of process 900 is shown, but in some aspects, process 900 may include Fig. 9 The depicted blocks may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner. Additionally or alternatively, two or more of the blocks of process 900 may be performed in parallel.

[0219] Fig.101 is a diagram of an example apparatus 1000 for wireless communication. Apparatus 1000 may be a UE (e.g., UE 120), or a UE may include apparatus 1000. In some aspects, apparatus 1000 includes a receiving component 1002 and a transmitting component 1004 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1000 may communicate with another apparatus 1006 (such as a UE, a base station, or another wireless communication device) using receiving component 1002 and transmitting component 1004. As further shown, apparatus 1000 may include a communication manager 140.

[0220] In some aspects, the apparatus 1000 may be configured to perform Figures 6 to 7F Additionally or alternatively, the apparatus 1000 may be configured to perform one or more processes described herein, such as Figure 8 The process 800. In some aspects, Fig.10 The device 1000 and / or one or more components shown may include a combination of Figure 2 One or more components of the UE. Additionally or alternatively, Fig.10 One or more of the components shown may be combined with Figure 2 Additionally or alternatively, one or more components in the component set may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0221] The receiving component 1002 may receive communications, such as reference signals, control information, data communications, or combinations thereof, from the device 1006. The receiving component 1002 may provide the received communications to one or more other components of the device 1000. In some aspects, the receiving component 1002 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding) on ​​the received communications and may provide the processed signals to one or more other components of the device 1000. In some aspects, the receiving component 1002 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receiving processors, controllers / processors, memories or combinations thereof of the UE.

[0222] The transmitting component 1004 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1006. In some aspects, one or more other components of the device 1000 may generate communications and may provide the generated communications to the transmitting component 1004 for transmission to the device 1006. In some aspects, the transmitting component 1004 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1006. In some aspects, the transmitting component 1004 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the UE. In some aspects, the transmit component 1004 can be co-located with the receive component 1002 in a transceiver.

[0223] The receiving component 1002 may receive (e.g., from the device 1006) an SRS configuration for SRS resources included in the SRS resource set. The SRS configuration includes one or more first time domain parameters for the SRS resources. The receiving component 1002 may receive (e.g., from the device 1006) a dynamic indication of one or more second time domain parameters for the SRS resources. At least a subset of the one or more second time domain parameters is modified from the one or more first time domain parameters included in the SRS configuration. The sending component 1004 may send the SRS using the SRS resources included in the SRS resource set (e.g., to the device 1006) based at least in part on the one or more second time domain parameters.

[0224] The receiving component 1002 may receive a MAC-CE communication (e.g., from the device 1006) that activates an aperiodic SRS triggering state from a plurality of SRS triggering states associated with an aperiodic SRS resource set. One or more of the plurality of SRS triggering states are associated with different SRS configurations. The scheduling DCI communication triggers transmission of the SRS based at least in part on the aperiodic SRS triggering state, and the SRS includes the aperiodic SRS.

[0225] Fig.10 The number and arrangement of components shown are provided as examples. In practice, there may be Fig.10 Additional components, fewer components, different components, or components arranged in a different manner than those shown. Fig.10 Two or more components shown may be implemented in a single component, or Fig.10 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.10 The illustrated set of component(s) may be described as being executable by Fig.10Another component shown may be a collection of components that perform one or more functions.

[0226] Fig.11 1 is a diagram of an example apparatus 1100 for wireless communication. Apparatus 1100 may be a network node (e.g., base station 110, CU 310, DU 330, RU 340, network node 605, etc.), or a network node may include apparatus 1100. In some aspects, apparatus 1100 includes a receiving component 1102 and a transmitting component 1104 that may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1100 may communicate with another apparatus 1106 (such as a UE, a base station, or another wireless communication device) using receiving component 1102 and transmitting component 1104. As further shown, apparatus 1100 may include a communication manager 150.

[0227] In some aspects, the apparatus 1100 may be configured to perform Figures 6 to 7F Additionally or alternatively, the apparatus 1100 may be configured to perform one or more processes described herein, such as Fig. 9 The process 900. In some aspects, Fig.11 The device 1100 and / or one or more components shown may include a combination of Figure 2 Additionally or alternatively, Fig.11 One or more of the components shown may be combined with Figure 2 Additionally or alternatively, one or more components in the component set may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0228] The receiving component 1102 may receive communications from the device 1106, such as reference signals, control information, data communications, or combinations thereof. The receiving component 1102 may provide the received communications to one or more other components of the device 1100. In some aspects, the receiving component 1102 may perform signal processing (such as filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding) on ​​the received communications and may provide the processed signals to one or more other components of the device 1100. In some aspects, the receiving component 1102 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories or combinations thereof of the base station.

[0229] The transmitting component 1104 may transmit communications, such as reference signals, control information, data communications, or combinations thereof, to the device 1106. In some aspects, one or more other components of the device 1100 may generate communications and may provide the generated communications to the transmitting component 1104 for transmission to the device 1106. In some aspects, the transmitting component 1104 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, etc.) on the generated communications and may transmit the processed signals to the device 1106. In some aspects, the transmitting component 1104 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the base station. In some aspects, the transmit component 1104 can be co-located with the receive component 1102 in a transceiver.

[0230] The transmitting component 1104 may transmit (e.g., to the device 1106) an SRS configuration for the SRS resources included in the SRS resource set. The SRS configuration includes one or more first time domain parameters for the SRS resources. The transmitting component 1104 may transmit (e.g., to the device 1106) a dynamic indication of one or more second time domain parameters for the SRS resources. At least a subset of the one or more second time domain parameters is modified from the one or more first time domain parameters included in the SRS configuration. The receiving component 1102 may receive the SRS in the SRS resources included in the SRS resource set (e.g., from the device 1106) based at least in part on the one or more second time domain parameters.

[0231] The transmitting component 1104 may transmit (e.g., to the device 1106) a MAC-CE communication that activates an aperiodic SRS triggering state from a plurality of SRS triggering states associated with an aperiodic SRS resource set. One or more of the plurality of SRS triggering states are associated with different SRS configurations. The scheduling DCI communication triggers transmission of the SRS based at least in part on the aperiodic SRS triggering state. The SRS includes an aperiodic SRS.

[0232] Fig.11 The number and arrangement of components shown are provided as examples. In practice, there may be Fig.11 Additional components, fewer components, different components, or components arranged in a different manner than those shown. Fig.11 Two or more components shown may be implemented in a single component, or Fig.11 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.11 The illustrated set of component(s) may be described as being executable by Fig.11Another component shown may be a collection of components that perform one or more functions.

[0233] The following provides an overview of some aspects of the disclosure:

[0234] Aspect 1: A method for wireless communication performed by a user equipment (UE), the method comprising: receiving an SRS configuration of an SRS resource included in a sounding reference signal (SRS) resource set, wherein the SRS configuration includes one or more first time domain parameters of the SRS resource; receiving a dynamic indication of one or more second time domain parameters of the SRS resource, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and sending an SRS using the SRS resource based at least in part on the one or more second time domain parameters.

[0235] Aspect 2: The method according to aspect 1, wherein the SRS comprises: a periodic SRS, a semi-persistent SRS, or an aperiodic SRS.

[0236] Aspect 3: The method according to aspect 1 or 2, wherein the one or more second time domain parameters include at least one of the following: one or more intra-time slot time domain mode related parameters, or one or more inter-time slot time domain mode related parameters.

[0237] Aspect 4: A method according to one or more aspects of Aspects 1 to 3, wherein the dynamic indication of the one or more second time domain parameters includes: a bitmap indicating the SRS symbol positions within multiple time slots of the SRS resource; and wherein the one or more first time domain parameters are indicated in another bitmap in the SRS configuration.

[0238] Aspect 5: A method according to Aspect 4, wherein each bit in the bitmap corresponds to a corresponding orthogonal frequency division multiplexing (OFDM) symbol associated with the SRS resource in a time slot, wherein the SRS symbol positions within the multiple time slots of the SRS resource correspond to associated OFDM symbol indices, and the associated OFDM symbol indices are based on the positions of the non-zero valued bits associated with the SRS symbol positions within the multiple time slots in the bitmap.

[0239] Aspect 6: The method according to aspect 5, wherein the bitmap indicates non-uniform time spacing of SRS symbol positions within the plurality of time slots of the SRS resource, and wherein the non-uniform time spacing can be arbitrarily configured.

[0240] Aspect 7: The method according to one or more aspects of aspects 4 to 6, wherein the bitmap indicates three intra-slot SRS symbol positions from the plurality of intra-slot SRS symbol positions of the SRS resource.

[0241] Aspect 8: The method according to aspect 7, wherein the SRS symbol positions within the three time slots are configured for three SRS transmissions.

[0242] Aspect 9: A method according to one or more aspects of Aspects 1 to 8, wherein the one or more second time domain parameters include at least one of the following: a modified starting position of a first SRS symbol of the SRS resource, a modified number of symbols that can be occupied by the SRS resource, or a modified periodicity and time slot offset of the SRS.

[0243] Aspect 10: A method according to one or more aspects of Aspects 1 to 9, wherein the SRS configuration is indicated in a radio resource control (RRC) communication; and wherein the one or more second time domain parameters are indicated in a dynamic control signaling indication, the dynamic control signaling indication comprising at least one of the following: a medium access control (MAC) control element (MAC-CE) indication, or a downlink control information (DCI) indication.

[0244] Aspect 11: A method according to Aspect 10, wherein the SRS includes at least one of a codebook-based SRS, a non-codebook-based SRS, or an antenna switching SRS; and wherein the one or more second time domain parameters enable the channel detection and channel state information (CSI) estimation procedures to be combined with complementary Doppler characteristic estimation based on the same resources.

[0245] Aspect 12: The method according to aspect 10 or 11, wherein the MAC-CE indication comprises: a MAC-CE-based reconfiguration indication, wherein the one or more second time domain parameters are explicitly indicated in the MAC-CE-based reconfiguration indication.

[0246] Aspect 13: A method according to one or more aspects of Aspects 10 to 13, wherein the SRS configuration includes a first SRS configuration, the first SRS configuration is included in a plurality of SRS configurations configured for the UE and associated with the SRS resource set, wherein the plurality of SRS configurations are indicated in the RRC communication; wherein a first MAC-CE indication activates the first SRS configuration; and wherein the MAC-CE indication includes: a second MAC-CE indication, the second MAC-CE indication indicating a second SRS configuration among the plurality of SRS configurations, wherein the one or more second time domain parameters are indicated in the second SRS configuration.

[0247] Aspect 14: The method according to aspect 10, wherein the dynamic control signaling communication includes: non-physical downlink shared channel (PDSCH) scheduled DCI communication having format 1_1 or format 1_2.

[0248] Aspect 15: The method according to aspect 14, wherein the one or more second time domain parameters are explicitly indicated by one or more repurposed DCI bit fields in the DCI communication.

[0249] Aspect 16: The method according to aspect 14 or 15, wherein the one or more second time domain parameters are implicitly indicated in the DCI communication.

[0250] Aspect 17: The method according to one or more of aspects 10 to 16, wherein the dynamic control signaling communication comprises: a non-scheduled DCI communication having a dedicated format dedicated for dynamic SRS parameter indication.

[0251] Aspect 18: A method according to one or more aspects of Aspects 10 to 17, wherein the dynamic control signaling communication includes: a non-physical uplink shared channel (PUSCH) scheduled DCI communication having format 0_1 ​​or format 0_2, wherein the one or more second time domain parameters are indicated by one or more repurposed DCI bit fields in the DCI communication.

[0252] Aspect 19: A method according to one or more aspects of Aspects 10 to 18, wherein the dynamic control signaling communication includes: a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH) scheduling DCI communication, and the physical uplink shared channel (PUSCH) or the physical downlink shared channel (PDSCH) scheduling DCI communication triggers the transmission of a non-periodic SRS associated with a non-periodic SRS resource set.

[0253] Aspect 20: A method according to Aspect 19, wherein the one or more second time domain parameters are associated with or indicated by a triggered SRS triggering state indicated by a corresponding DCI field in the scheduling DCI communication, wherein the DCI field conveys a code point linked to the SRS triggering state associated with the non-periodic SRS resource set, and wherein the SRS triggering state is included among multiple SRS triggering states associated with the SRS resource set, and wherein each of the multiple SRS triggering states is associated with a corresponding SRS configuration.

[0254] Aspect 21: According to the method of Aspect 19 or 20, the method also includes: receiving a medium access control (MAC) control element (MAC-CE) communication, wherein the medium access control (MAC) control element (MAC-CE) communication activates a non-periodic SRS triggering state from multiple SRS triggering states associated with the non-periodic SRS resource set, wherein one or more SRS triggering states of the multiple SRS triggering states are associated with different SRS configurations, wherein the scheduled DCI communication triggers the sending of the SRS at least partially based on the non-periodic SRS triggering state, and wherein the SRS includes a non-periodic SRS.

[0255] Aspect 22: The method according to one or more of aspects 10 to 21, wherein the dynamic control signaling communication includes an indication of one or more modified frequency domain parameters associated with the SRS resource set.

[0256] Aspect 23: A method of wireless communication performed by a network node, the method comprising: sending an SRS configuration of an SRS resource included in a sounding reference signal (SRS) resource set to a user equipment (UE), wherein the SRS configuration includes one or more first time domain parameters of the SRS resource; sending a dynamic indication of one or more second time domain parameters of the SRS resource to the UE, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and receiving an SRS in the SRS resource from the UE and at least partially based on the one or more second time domain parameters.

[0257] Aspect 24: The method according to aspect 23, wherein the SRS comprises: a periodic SRS, a semi-persistent SRS, or an aperiodic SRS.

[0258] Aspect 25: The method according to Aspect 23 or 24, wherein the one or more second time domain parameters include at least one of the following: one or more intra-time slot time domain mode related parameters, or one or more inter-time slot time domain mode related parameters.

[0259] Aspect 26: The method according to one or more aspects of Aspects 23 to 25, wherein the dynamic indication of the one or more second time domain parameters comprises: a bitmap indicating SRS symbol positions within multiple time slots of the SRS resource.

[0260] Aspect 27: A method according to Aspect 26, wherein each bit in the bitmap corresponds to a corresponding orthogonal frequency division multiplexing (OFDM) symbol associated with the SRS resource in a time slot, wherein the SRS symbol positions within the multiple time slots of the SRS resource correspond to associated OFDM symbol indices, and the associated OFDM symbol indices are based on the positions of the non-zero valued bits associated with the SRS symbol positions within the multiple time slots in the bitmap.

[0261] Aspect 28: The method according to aspect 27, wherein the bitmap indicates non-uniform time spacing of SRS symbol positions within the plurality of time slots in the SRS resource, and wherein the non-uniform time spacing can be arbitrarily configured.

[0262] Aspect 29: The method according to one or more of aspects 26 to 28, wherein the bitmap indicates three intra-slot SRS symbol positions from the plurality of intra-slot SRS symbol positions of the SRS resource.

[0263] Aspect 30: The method according to aspect 29, wherein the SRS symbol positions within the three time slots are configured for three SRS transmissions.

[0264] Aspect 31: A method according to one or more aspects of Aspects 23 to 30, wherein the one or more second time domain parameters include at least one of the following: a modified starting position of the first SRS symbol of the SRS resource, a modified number of symbols that can be occupied by the SRS resource, or a modified periodicity and time slot offset of the SRS.

[0265] Aspect 32: A method according to one or more aspects of Aspects 23 to 31, wherein the SRS configuration is indicated in a radio resource control (RRC) communication; and wherein the one or more second time domain parameters are indicated in a dynamic control signaling indication, and the dynamic control signaling indication includes at least one of the following: a medium access control (MAC) control element (MAC-CE) indication, or a downlink control information (DCI) communication.

[0266] Aspect 33: A method according to Aspect 32, wherein the SRS includes at least one of a codebook-based SRS, a non-codebook-based SRS, or an antenna switching SRS; and wherein the one or more second time domain parameters enable the channel detection and channel state information (CSI) estimation procedures to be combined with complementary Doppler characteristic estimation based on the same resources.

[0267] Aspect 34: The method according to aspect 32 or 33, wherein the MAC-CE indication comprises: a MAC-CE-based reconfiguration indication, wherein the one or more second time domain parameters are explicitly indicated in the MAC-CE-based reconfiguration indication.

[0268] Aspect 35: A method according to one or more aspects of Aspects 32 to 34, wherein the SRS configuration includes a first SRS configuration, the first SRS configuration is included in a plurality of SRS configurations configured for the UE and associated with the SRS resource set, wherein the plurality of SRS configurations are indicated in the RRC communication; wherein a first MAC-CE indication activates the first SRS configuration; and wherein the MAC-CE indication includes: a second MAC-CE indication, the second MAC-CE indication indicating a second SRS configuration among the plurality of SRS configurations, wherein the one or more second time domain parameters are indicated in the second SRS configuration.

[0269] Aspect 36: A method according to one or more aspects of Aspects 32 to 35, wherein the dynamic control signaling communication includes: non-physical downlink shared channel (PDSCH) scheduled DCI communication having format 1_1 or format 1_2.

[0270] Aspect 37: The method according to aspect 36, wherein the one or more second time domain parameters are explicitly indicated by one or more repurposed DCI bit fields in the DCI communication.

[0271] Aspect 38: The method according to aspect 36 or 37, wherein the one or more second time domain parameters are implicitly indicated in the DCI communication.

[0272] Aspect 39: A method according to one or more of aspects 32 to 38, wherein the dynamic control signaling communication comprises: a non-scheduled DCI communication having a dedicated format dedicated for dynamic SRS parameter indication.

[0273] Aspect 40: A method according to one or more aspects of Aspects 32 to 39, wherein the dynamic control signaling communication includes: a non-physical uplink shared channel (PUSCH) scheduled DCI communication having format 0_1 ​​or format 0_2, wherein the one or more second time domain parameters are indicated by one or more repurposed DCI bit fields in the DCI communication.

[0274] Aspect 41: A method according to one or more aspects of Aspects 32 to 40, wherein the dynamic control signaling communication includes: a physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH) scheduling DCI communication, and the physical uplink shared channel (PUSCH) or the physical downlink shared channel (PDSCH) scheduling DCI communication triggers the transmission of a non-periodic SRS associated with a non-periodic SRS resource set.

[0275] Aspect 42: A method according to Aspect 41, wherein the one or more second time domain parameters are associated with or indicated by a triggered SRS triggering state indicated by a corresponding DCI field in the scheduling DCI communication, wherein the DCI field conveys a code point linked to the SRS triggering state associated with the non-periodic SRS resource set, and wherein the SRS triggering state is included among a plurality of SRS triggering states associated with the non-periodic SRS resource set, and wherein each of the plurality of SRS triggering states is associated with a corresponding SRS configuration.

[0276] Aspect 43: According to the method described in Aspect 41 or 42, the method also includes: sending a medium access control (MAC) control element (MAC-CE) communication, wherein the medium access control (MAC) control element (MAC-CE) communication activates a non-periodic SRS triggering state from multiple SRS triggering states associated with the non-periodic SRS resource set, wherein one or more SRS triggering states among the multiple SRS triggering states are associated with different SRS configurations, wherein the scheduled DCI communication triggers the sending of the SRS at least partially based on the non-periodic SRS triggering state, and wherein the SRS includes a non-periodic SRS.

[0277] Aspect 44: The method according to one or more of aspects 32 to 43, wherein the dynamic control signaling communication includes a dynamic indication of one or more modified frequency domain parameters associated with the SRS resource set.

[0278] Aspect 45: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to one or more of Aspects 1 to 22.

[0279] Aspect 46: A device for wireless communication, the device comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to execute the method according to one or more of aspects 1 to 22.

[0280] Aspect 47: An apparatus for wireless communication, the apparatus comprising: at least one means for performing the method according to one or more aspects of aspects 1 to 22.

[0281] Aspect 48: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1 to 22.

[0282] Aspect 49: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform a method according to one or more of Aspects 1 to 22.

[0283] Aspect 50: An apparatus for performing wireless communications at a device, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to one or more of Aspects 23 to 44.

[0284] Aspect 51: A device for wireless communication, the device comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to execute the method according to one or more aspects of aspects 23 to 44.

[0285] Aspect 52: An apparatus for wireless communication, the apparatus comprising: at least one means for performing the method according to one or more of aspects 23 to 44.

[0286] Aspect 53: A non-transitory computer-readable medium storing a code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 23 to 44.

[0287] Aspect 54: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform a method according to one or more of Aspects 23 to 44.

[0288] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of these aspects.

[0289] As used herein, the term "component" is intended to be broadly interpreted as a combination of hardware and / or hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language or other names, "software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures and / or functions, etc. As used herein, a "processor" is implemented in a combination of hardware and / or hardware and software. It will be apparent that the systems and / or methods described herein can be implemented by a combination of hardware and / or hardware and software in different forms. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit various aspects. Therefore, there is no reference to a specific software code herein to describe the operation and behavior of the system and / or method, because those skilled in the art will understand that software and hardware can be designed to implement the system and / or method based at least in part on the description herein.

[0290] As used herein, "satisfying a threshold" may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0291] Although the specific combination of features is described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features can be combined in a manner that is not specifically described in the claims and / or is not disclosed in the specification. The disclosure of various aspects includes each dependent claim combined with each other claim in the claim set. As used herein, the phrase "at least one of" the list of items refers to any combination of these items (it includes a single member). As an example, "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, and any combination with multiple identical elements (for example, 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).

[0292] Any element, action or instruction used herein should not be interpreted as critical or necessary, unless clearly stated. In addition, as used herein, the article "a / an" is intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the article "said" is intended to include one or more items connected with the article "said", and can be used interchangeably with "said one or more". In addition, as used herein, the terms "set" and "group" are intended to include one or more items, and can be used interchangeably with "one or more". If you want to refer to only one item, use the phrase "only one" or similar terms. In addition, as used herein, the term "has / have / having" etc. is intended to be an open term, which does not limit the elements they modify (for example, "an element with" A can also have B). In addition, the phrase "based on" is intended to represent "based at least in part", unless otherwise clearly stated. Additionally, as used herein, the term "or" when used in a series is intended to be open-ended and used interchangeably with "and / or" unless expressly stated otherwise (eg, if used in conjunction with "either" or "only one of").

Claims

1. A method of wireless communication performed by a user equipment (UE), the method comprising: receiving a sounding reference signal (SRS) configuration of an SRS resource in an SRS resource set, wherein the SRS configuration includes one or more first time domain parameters of an SRS resource included in the SRS resource; receiving a dynamic indication of the SRS resource and one or more second time domain parameters of the SRS resource included therein, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and An SRS is transmitted using the SRS resource based at least in part on the one or more second time domain parameters.

2. The method according to claim 1, wherein the SRS comprises: Periodic SRS, Semi-permanent SRS, or Aperiodic SRS.

3. The method according to claim 1, wherein the one or more second time domain parameters include at least one of the following: One or more time-slot time-domain mode related parameters, or One or more inter-slot time domain mode related parameters.

4. The method of claim 1 , wherein the dynamic indication of the one or more second time domain parameters comprises: a bitmap indicating SRS symbol positions within a plurality of time slots of the SRS resource; and The one or more first time domain parameters are indicated in another bitmap in the SRS configuration.

5. The method of claim 4, wherein each bit in the bitmap corresponds to a respective orthogonal frequency division multiplexing (OFDM) symbol in a time slot associated with the SRS resource, The plurality of intra-slot SRS symbol positions of the SRS resource correspond to associated OFDM symbol indices based on positions in the bitmap of non-zero-valued bits associated with the plurality of intra-slot SRS symbol positions. 6 . The method of claim 5 , wherein the bitmap indicates non-uniform time spacing of SRS symbol positions within the plurality of time slots of the SRS resource, and wherein the non-uniform time spacing can be arbitrarily configured.

7. The method of claim 4, wherein the bitmap indicates three intra-slot SRS symbol positions from the plurality of intra-slot SRS symbol positions of the SRS resource. The method of claim 7 , wherein the SRS symbol positions within the three time slots are configured for three SRS repetitions.

9. The method according to claim 1, wherein the one or more second time domain parameters include at least one of the following: a modified starting position of the first SRS symbol of the SRS resource, a modified number of symbols that can be occupied by the SRS resource, or The modified periodicity and slot offset of the SRS.

10. The method of claim 1, wherein the SRS configuration is indicated in a radio resource control (RRC) communication; and The one or more second time domain parameters are indicated in a dynamic control signaling indication, and the dynamic control signaling indication includes at least one of the following: Medium Access Control (MAC) Control Element (MAC-CE) indication, or Downlink Control Information (DCI) indication.

11. The method according to claim 10, wherein the SRS comprises at least one of a codebook-based SRS, a non-codebook-based SRS, or an antenna switching SRS; and The one or more second time domain parameters enable combining a channel sounding and channel state information (CSI) estimation procedure with complementary Doppler characteristic estimation based on the same resources.

12. The method according to claim 10, wherein the MAC-CE indication comprises: Based on MAC-CE reconfiguration indication, The one or more second time domain parameters are explicitly indicated in the MAC-CE based reconfiguration indication.

13. The method according to claim 10, wherein the SRS configuration comprises a first SRS configuration, the first SRS configuration being included in a plurality of SRS configurations configured for the UE and associated with the SRS resource, wherein the plurality of SRS configurations are indicated in the RRC communication; The first MAC-CE indicates activation of the first SRS configuration; and The MAC-CE indication includes: a second MAC-CE indication, wherein the second MAC-CE indication activates a second SRS configuration among the multiple SRS configurations, The one or more second time domain parameters are indicated in the second SRS configuration.

14. The method of claim 10, wherein the dynamic control signaling communication comprises: A non-physical downlink shared channel (PDSCH) with format 1_1 or format 1_2 schedules DCI communication.

15. The method of claim 14, wherein the one or more second time domain parameters are explicitly indicated by one or more repurposed DCI bit fields in the DCI communication.

16. The method of claim 14, wherein the one or more second time domain parameters are implicitly indicated in the DCI communication.

17. The method of claim 10, wherein the dynamic control signaling communication comprises: Non-scheduled DCI communication with a dedicated format dedicated for dynamic SRS parameter indication.

18. The method of claim 10, wherein the dynamic control signaling communication comprises: Non-Physical Uplink Shared Channel (PUSCH) scheduling DCI communications with format 0_1 ​​or format 0_2, The one or more second time domain parameters are indicated by one or more repurposed DCI bit fields in the DCI communication.

19. The method of claim 10, wherein the dynamic control signaling communication comprises: A physical uplink shared channel (PUSCH) or a physical downlink shared channel (PDSCH) schedules DCI communication, which triggers the transmission of an aperiodic SRS associated with a triggered aperiodic SRS resource set identifier.

20. The method of claim 19, wherein the one or more second time domain parameters are associated with or indicated by a triggered SRS triggering state indicated by a corresponding DCI field in the scheduling DCI communication, wherein the DCI field conveys a code point linked to the SRS triggering state associated with the aperiodic SRS resource set, and wherein the SRS triggering state is included in a plurality of SRS triggering states associated with the SRS resource set, and Each SRS triggering state in the multiple SRS triggering states is associated with a corresponding SRS configuration.

21. The method according to claim 19, further comprising: receiving a medium access control (MAC) control element (MAC-CE) communication activating one SRS triggering state from a plurality of SRS triggering states associated with the aperiodic SRS resource set, wherein one or more of the plurality of SRS triggering states are associated with different SRS configurations, The scheduled DCI communication triggers the transmission of the aperiodic SRS based at least in part on the SRS triggering state and an SRS configuration associated with the SRS triggering state.

22. The method of claim 10, wherein the dynamic control signaling communication includes an indication of one or more modified frequency domain parameters associated with the SRS resources.

23. A user equipment (UE) for wireless communication, the user equipment (UE) comprising: Memory; and one or more processors coupled to the memory, the one or more processors configured to: receiving a sounding reference signal (SRS) configuration of an SRS resource in an SRS resource set, wherein the SRS configuration includes one or more first time domain parameters of the SRS resource; receiving a dynamic indication of one or more second time domain parameters of the SRS resource, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and An SRS is transmitted using the SRS resource based at least in part on the one or more second time domain parameters.

24. The UE according to claim 23, wherein the dynamic indication of the one or more second time domain parameters comprises: A bitmap indicating the positions of SRS symbols within a plurality of time slots of the SRS resource.

25. The UE of claim 23, wherein the SRS configuration is indicated in a radio resource control (RRC) communication; and The one or more second time domain parameters are indicated in a dynamic control signaling indication, and the dynamic control signaling indication includes at least one of the following: Medium Access Control (MAC) Control Element (MAC-CE) indication, or Downlink Control Information (DCI) indication.

26. A non-transitory computer readable medium storing an instruction set for wireless communication, the instruction set comprising: One or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to: receiving a sounding reference signal (SRS) configuration of an SRS resource in an SRS resource set, wherein the SRS configuration includes one or more first time domain parameters of the SRS resource; receiving a dynamic indication of one or more second time domain parameters of the SRS resource, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and An SRS is transmitted using the SRS resource based at least in part on the one or more second time domain parameters.

27. The non-transitory computer readable medium of claim 26, wherein the dynamic indication of the one or more second time domain parameters comprises: A bitmap indicating the positions of SRS symbols within a plurality of time slots of the SRS resource.

28. The non-transitory computer-readable medium of claim 26, wherein the SRS configuration is indicated in a radio resource control (RRC) communication; and The one or more second time domain parameters are indicated in a dynamic control signaling indication, and the dynamic control signaling indication includes at least one of the following: Medium Access Control (MAC) Control Element (MAC-CE) indication, or Downlink Control Information (DCI) indication.

29. An apparatus for wireless communication, the apparatus comprising: means for receiving a sounding reference signal (SRS) configuration of SRS resources included in an SRS resource set, wherein the SRS configuration includes one or more first time domain parameters of the SRS resource; means for receiving a dynamic indication of one or more second time domain parameters of the SRS resource, wherein at least a subset of the one or more second time domain parameters are modified from the one or more first time domain parameters included in the SRS configuration; and Means for transmitting an SRS using the SRS resource based at least in part on the one or more second time domain parameters.

30. The apparatus of claim 29, wherein the dynamic indication of the one or more second time domain parameters comprises: A bitmap indicating the positions of SRS symbols within a plurality of time slots of the SRS resource.

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