Enhanced sounding reference signal resource configuration

Abstract

Methods, systems, and devices for wireless communications are described. In some examples, a UE may receive an indication of a set of sounding reference signal (SRS) parameters corresponding to a set of SRS resources for transmitting an SRS, wherein the set of SRS resources may refer to frequency or time or both. In some examples, the SRS parameters may include, among other things, frequency allocation, frequency overlap parameters, number of allocated symbols, comb values, cyclic shifts, comb offsets, frequency hopping parameters, repetition parameters, symbol grouping parameters, or any combination thereof. The UE may determine an SRS configuration for one or more SRSs based on the set of SRS parameters, and transmit one or more SRSs based on the configuration. In some examples, the SRS configuration includes a configuration for SRS frequency hopping or SRS repetition or both.

Description

Technical Field

[0001] The following description relates generally to wireless communications, and more particularly to enhanced sounding reference signal (SRS) resource configuration. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, improved LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiplexing (OFDMA), or discrete Fourier transform extended orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication for multiple communication devices (which may be further referred to as user equipment (UE)). Summary of the invention

[0003] The described technology relates to improved methods, systems, devices and apparatuses for supporting enhanced sounding reference signal (SRS) resource configuration. In general, the described technology facilitates enhanced SRS configuration to improve the flexibility of SRS and improve the efficiency of SRS resource utilization. In some examples, a UE may receive an indication of a set of SRS parameters corresponding to a set of SRS resources for sending one or more SRS from a base station, wherein the set of SRS resources may refer to frequency (e.g., physical resource block (PRB) index, subcarrier index) or time (e.g., orthogonal frequency division multiplexing (OFDM) symbol index) or both. In some examples, the SRS parameters may include frequency allocation, frequency overlap parameters, the number of allocated symbols, comb values, cyclic shifts, cyclic offset shifts, comb offsets, frequency hopping parameters, repetition parameters, symbol grouping parameters or any combination thereof. The UE may determine an SRS configuration for one or more SRSs based on one or more SRS parameters in the set of SRS parameters. In some examples, the SRS configuration may include a configuration for SRS frequency hopping or SRS repetition or both. The UE may send one or more SRSs in one or more SRSs to the base station based on the SRS configuration.

[0004] A method for wireless communication at a UE is described. The method may include receiving an indication of an SRS parameter set corresponding to an SRS resource set for sending one or more SRSs from a base station; determining an SRS configuration for the one or more SRSs based on the SRS parameter set, wherein the SRS configuration includes a configuration of a number of symbols for which the SRSs are configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for the SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof; and sending the one or more SRSs to the base station based on the SRS configuration.

[0005] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive an indication of an SRS parameter set corresponding to an SRS resource set for sending one or more SRSs from a base station; determine an SRS configuration for one or more SRSs based on the SRS parameter set, wherein the SRS configuration includes a configuration of the number of symbols for which the SRS is configured, a non-uniform grouping for at least one SRS of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof; and send one or more SRSs to the base station based on the SRS configuration.

[0006] Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving an indication of an SRS parameter set corresponding to an SRS resource set for sending one or more SRSs from a base station; determining an SRS configuration for the one or more SRSs based on the SRS parameter set, wherein the SRS configuration includes a configuration of a number of symbols for which the SRSs are configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for the SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof; and sending the one or more SRSs to the base station based on the SRS configuration.

[0007] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: receive an indication of an SRS parameter set corresponding to an SRS resource set for sending one or more SRSs from a base station; determine an SRS configuration for the one or more SRSs based on the SRS parameter set, wherein the SRS configuration includes a configuration of a number of symbols for which the SRSs are configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for the SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof; and send the one or more SRSs to the base station based on the SRS configuration.

[0008] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set includes operations, features, units, or instructions for receiving an indication of a number of symbols for which the SRS is configured, the number of symbols being greater than four symbols.

[0009] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set includes operations, features, units, or instructions for receiving an indication of a number of symbols for which the SRS is configured, the number of symbols being up to fourteen symbols.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining an SRS configuration may include operations, features, elements, or instructions for determining that each of one or more antenna ports for an SRS resource can be mapped to a single group of subcarriers of symbols spanning one or more pairs of the SRS resource.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining that an SRS configuration may not be supported based on determining that each of one or more antenna ports for an SRS resource may be mapped to subcarriers of a single group of symbols across one or more pairs of SRS resources, wherein sending one or more SRSs to a base station may be based on determining that the SRS configuration may not be supported.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining an SRS configuration may include operations, features, units, or instructions for determining non-uniform grouping for one or more SRSs based on determining that each of one or more antenna ports for an SRS resource can be mapped to a single group of subcarriers of symbols across one or more pairs of SRS resources, wherein sending one or more SRSs to a base station may be based on determining the non-uniform grouping for the one or more SRSs.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set includes operations, features, units, or instructions for receiving an indication of non-uniform groupings for one or more SRSs for SRS resources in an SRS resource set or a second SRS resource set, and wherein determining the SRS configuration includes determining non-uniform groupings for one or more SRSs based on receiving the indication of the non-uniform groupings.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining non-uniform grouping may include operations, features, means, or instructions for determining that one or more SRSs may each be mapped to different groups of subcarriers across different symbols of an SRS resource.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining non-uniform grouping may include operations, features, units, or instructions for: determining that one of one or more SRSs may be repeated on the same set of subcarriers across consecutive symbols of an SRS resource; and determining that one of one or more SRSs may not be repeated on the same set of subcarriers across consecutive symbols of an SRS resource.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining non-uniform grouping may include operations, features, units, or instructions for: determining that one of one or more SRSs is sent on a first group of subcarriers on at least a first symbol of an SRS resource; and determining that one of the one or more SRSs is sent on a second group of subcarriers on at least a second symbol of the SRS resource.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining an SRS configuration may include operations, features, units, or instructions for setting a number of frequency hopping for at least one of one or more SRSs, or setting a number of symbols per frequency hopping for at least one of one or more SRSs, or both.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set includes operations, features, units, or instructions for receiving an indication of comb values ​​for one or more symbols of an SRS resource in an SRS resource set, and wherein determining the SRS configuration includes setting a first comb value for a first symbol in the one or more symbols of the SRS resource, and setting a second comb value for a second symbol in the one or more symbols of the SRS resource.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set includes operations, features, units, or instructions for receiving an indication of a cyclic shift value or a cyclic shift offset for one or more symbols of an SRS resource in an SRS resource set, and wherein determining the SRS configuration includes setting a first cyclic shift value or a first cyclic shift offset for a first symbol in the one or more symbols of the SRS resource, and setting a second cyclic shift value or a second cyclic shift offset for a second symbol in the one or more symbols of the SRS resource.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set may include operations, features, units, or instructions for receiving an indication of a comb offset value for one or more symbols of an SRS resource in an SRS resource set, and wherein determining the SRS configuration includes setting a first comb offset value for a first symbol of the one or more symbols of the SRS resource, and setting a second comb offset value for a second symbol of the one or more symbols of the SRS resource.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set can include operations, features, units, or instructions for receiving an indication of a partial frequency overlap of symbols for SRS resources in an SRS resource set, and wherein determining the SRS configuration includes setting a first group of subcarriers for a first symbol of the SRS resource set, setting a second group of subcarriers for a second symbol of the SRS resource set, the first group of subcarriers at least partially overlapping the second group of subcarriers.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining the SRS configuration may include operations, features, means, or instructions for setting a third group of subcarriers for a third symbol of the SRS resource set, the third group of subcarriers at least partially overlapping the second group of subcarriers by the same amount as the first group of subcarriers at least partially overlapping the second group of subcarriers.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining the SRS configuration may include operations, features, means, or instructions for setting a third group of subcarriers for a third symbol of the SRS resource set, the third group of subcarriers at least partially overlapping with the second group of subcarriers by an amount that is different from the amount by which the first group of subcarriers at least partially overlap with the second group of subcarriers.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining the SRS configuration may include operations, features, means, or instructions for setting a third group of subcarriers for a third symbol of the SRS resource set, and setting a fourth group of subcarriers for a fourth symbol of the SRS resource set, the fourth group of subcarriers at least partially overlapping the third group of subcarriers by the same amount as the first group of subcarriers at least partially overlapping the second group of subcarriers.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining the SRS configuration may include operations, features, means, or instructions for setting a third group of subcarriers for a third symbol of the SRS resource set, and setting a fourth group of subcarriers for a fourth symbol of the SRS resource set, wherein the fourth group of subcarriers at least partially overlaps with the third group of subcarriers by an amount different from the amount by which the first group of subcarriers at least partially overlaps with the second group of subcarriers.

[0026] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining the SRS configuration may include operations, features, means, or instructions for setting a third group of subcarriers for a third symbol of the SRS resource set, and setting a fourth group of subcarriers for a fourth symbol of the SRS resource set, the fourth group of subcarriers not overlapping with the third group of subcarriers.

[0027] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining an SRS configuration may include operations, features, units, or instructions for determining a first SRS configuration for a first subset of time slots, and determining a second SRS configuration for a subset of time slots, and wherein the SRS includes one or more of a periodic SRS or a semi-persistent SRS.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining a first SRS configuration and a second SRS configuration may include operations, features, units, or instructions for determining one or more SRS parameters in an SRS parameter set for a first SRS configuration that may be different from one or more SRS parameters in an SRS parameter set for a second SRS configuration based on a frame index, a time slot index, a periodic timing, a defined order, or any combination thereof.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, SRS configuration may include operations, features, means, or instructions for configuration of a periodic SRS or a semi-persistent SRS.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an SRS parameter set may include operations, features, units, or instructions for frequency allocation, comb values, cyclic shifts, cyclic shift offsets, comb offsets, frequency hopping parameters, repetition parameters, symbol grouping parameters, or any combination thereof.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set may include operations, features, units, or instructions for receiving an indication of a symbol grouping parameter for indicating one or more of: the number of hops or the number of symbols per hop for the SRS configuration.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set may also include operations, features, units, or instructions for receiving radio resource control (RRC) signaling including an indication of the SRS parameter set.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an indication of an SRS parameter set may also include operations, features, units, or instructions for receiving downlink control information (DCI) or a medium access control control element (MAC-CE) including an indication of the SRS parameter set.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, determining an SRS configuration may include operations, features, units, or instructions for: selecting a defined configuration based on receiving a DCI or MAC-CE; or setting one or more SRS parameters in an SRS parameter set for an SRS configuration based on receiving a DCI or MAC-CE.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: receiving a DCI or MAC-CE including an indication of a second SRS parameter set; updating an SRS configuration for one or more SRSs based on the second SRS parameter set; and sending one or more SRSs to a base station based on the updated SRS configuration.

[0036] A method for wireless communication at a base station is described. The method may include: determining an SRS resource set and an SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from a UE; sending an indication of the SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from the UE to the UE; and receiving one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration includes a configuration of a number of symbols for which the SRS is configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for the SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0037] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to perform the following operations: determine an SRS resource set for sending one or more SRSs from a UE and an SRS parameter set corresponding to the SRS resource set; send an indication of an SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from the UE to the UE; receive one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration includes a configuration of a number of symbols for which the SRS is configured, a non-uniform grouping for at least one SRS of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0038] Another apparatus for wireless communication at a base station is described. The apparatus may include: a unit for determining an SRS resource set for sending one or more SRSs from a UE and an SRS parameter set corresponding to the SRS resource set; a unit for sending an indication of the SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from the UE to the UE; and a unit for receiving one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration includes a configuration of a number of symbols for which the SRS is configured, a non-uniform grouping for at least one SRS of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for the SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0039] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to perform the following operations: determine an SRS resource set and an SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from a UE; send an indication of the SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from the UE to the UE; and receive one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration includes a configuration of a number of symbols for which the SRS is configured, a non-uniform grouping for at least one SRS of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication of a number of symbols for which the SRS is configured, the number of symbols being greater than four symbols.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication of a number of symbols for which the SRS is configured, the number of symbols being up to fourteen symbols.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication of non-uniform grouping of one or more SRSs for SRS resources in an SRS resource set or a second SRS resource set.

[0043] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication of comb values ​​for one or more symbols of an SRS resource in an SRS resource set.

[0044] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication of a cyclic shift value or a cyclic shift offset for one or more symbols of an SRS resource in an SRS resource set.

[0045] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication of comb offset values ​​for one or more symbols of an SRS resource in an SRS resource set.

[0046] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication that partial frequency overlap of symbols for SRS resources in an SRS resource set may be configured.

[0047] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, frequency assignments, comb values, cyclic shifts, cyclic shift offsets, comb offsets, frequency hopping parameters, repetition parameters, symbol grouping parameters, or any combination thereof.

[0048] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may include operations, features, units, or instructions for sending an indication of a symbol grouping parameter for indicating one or more of: the number of frequency hops or the number of symbols per frequency hop for the SRS configuration.

[0049] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may also include operations, features, means, or instructions for sending RRC signaling including the indication of the SRS parameter set.

[0050] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an indication of an SRS parameter set may also include operations, features, units, or instructions for sending a DCI or MAC-CE including an indication of the SRS parameter set.

[0051] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending downlink control information or MAC-CE including an indication of a second SRS parameter set; and receiving one or more SRSs to the base station based on the updated SRS configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 An example of a wireless communication system supporting enhanced sounding reference signal (SRS) resource configuration is shown according to aspects of the present disclosure.

[0053] Figure 2An example of a wireless communication system supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure.

[0054] FIG. 3A to FIG. 5B An example of SRS resource configuration supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure.

[0055] Figure 6 An example of a process flow to support enhanced SRS resource configuration is shown according to aspects of the present disclosure.

[0056] Figure 7 and Figure 8 A block diagram of a device supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure.

[0057] Fig. 9 A block diagram of a communication manager supporting enhanced SRS resource configuration is shown in accordance with aspects of the present disclosure.

[0058] Fig.10 A schematic diagram of a system including a device is shown according to aspects of the present disclosure, wherein the device supports enhanced SRS resource configuration.

[0059] Fig.11 and Fig.12 A block diagram of a device supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure.

[0060] Fig.13 A block diagram of a communication manager supporting enhanced SRS resource configuration is shown in accordance with aspects of the present disclosure.

[0061] Fig.14 A schematic diagram of a system including a device is shown according to aspects of the present disclosure, wherein the device supports enhanced SRS resource configuration.

[0062] Figures 15 to 18 A flow chart illustrating a method of supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. DETAILED DESCRIPTION

[0063] A user equipment (UE) in a wireless communication system can communicate with other wireless devices such as a base station. The base station can configure resources to be used for communicating with the UE. In some examples, the UE can have multiple antennas, and a reference signal can be sent according to an antenna switching process to provide channel estimates for one or more of the antennas. The reference signal resources used to send the reference signal can be sent aperiodically (e.g., via downlink control information (DCI) signaling), semi-persistently, or periodically. The UE can then select one or more antennas for communication, or the base station can determine one or more communication beams based on the channel estimate.

[0064] As such, the UE may send a reference signal, such as a sounding reference signal (SRS), to the base station. In some examples, the base station may configure one or more reference signal resources for a set of symbols (e.g., one or more symbols), one or more subcarriers, one or more ports or antennas, etc., where an SRS resource set may include one or more resources for use by the UE to send the SRS.

[0065] The UE may be configured by the base station with one or more resources, which may be grouped into reference signal resource sets depending on the application. Applications may include antenna switching, codebook-based communications, non-codebook-based communications, or beam management, or any combination thereof, among other examples.

[0066] In some other example configurations, the base station may configure one or more SRS resources so that the SRS resources may span one or more (e.g., 1, 2, 4) continuous or discontinuous symbols, with up to 4 ports per reference signal resource. In some examples, each port of the reference signal resource may be detected in each symbol. In some wireless communication systems, the SRS may be sent only in the last 6 symbols of a time slot, and may be sent only after a physical uplink channel (PUSCH) transmission in a time slot. In some implementations, SRS resources sent under such a configuration may result in inefficient use of resources, and may be subject to strict constraints based on previous restrictions on SRS transmissions.

[0067] According to the present disclosure, in order to more efficiently utilize SRS resources and increase SRS flexibility, the base station may send a set of SRS parameters (e.g., one or more) to the UE, and the UE may use the SRS parameters when determining the SRS transmission configuration that the UE should use to send SRS to the base station. In some examples, the set of parameters may include an indication that the UE may be configured to support SRS frequency hopping and repetition for more than 4 symbols and up to 14 symbols. Additionally or alternatively, the UE may be configured to support non-uniform grouping for SRS frequency hopping and repetition. Additionally or alternatively, the UE may be configured to support different comb values, cyclic shift values, comb offset values, or cyclic shift offset values ​​and other values ​​for SRS resources. Additionally or alternatively, the UE may be configured to support partial frequency overlap between symbols of different frequency hopping in one or more SRS resources. In some examples, the frequency overlap between a set of symbols (e.g., one or more symbols) may be the same or different from the frequency overlap between another set of symbols (e.g., one or more symbols). Additionally or alternatively, the UE may be configured to support different parameter assignments across time slots. Additionally or alternatively, the UE may be configured to receive SRS resource parameters via radio resource control (RRC) signaling, signaling including DCI, or signaling related to a medium access control element (MAC-CE). In some examples, the UE may be configured to receive a first SRS configuration via RRC signaling, and to receive a second set (e.g., an updated set) of SRS parameters via DCI or MAC-CE. In some examples, the UE may receive a first SRS configuration via DCI or MAC-CE. As used herein, unless otherwise specified, a group may include one or more elements in the group.

[0068] Certain aspects of the subject matter described herein can be implemented to achieve one or more advantages. The described techniques can support improvements in the SRS transmission framework by increasing SRS resource configuration flexibility and increasing SRS resource utilization, among other advantages. As such, the supported techniques can include improved network operation, and in some examples, can improve network efficiency and various other benefits.

[0069] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Various aspects are then described with reference to SRS resource configurations and process flows. Various aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts related to enhanced SRS resource configurations.

[0070] Figure 1An example of a wireless communication system 100 supporting enhanced SRS resource configuration is shown according to various aspects of the present disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an improved LTE (LTE-A) network, an LTE-APro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0071] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be devices in different forms or with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support transmission of signals according to one or more radio access technologies.

[0072] UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, mobile, or both at different times. UEs 115 may be devices in different forms or with different capabilities. Some example UEs 115 are Figure 1 UE 115 described herein may be able to communicate with various types of devices such as other UE 115, base station 105, or network equipment (e.g., core network node, relay device, integrated access and backhaul (IAB) node, or other network equipment), such as Figure 1 as shown in .

[0073] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may be connected to the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other via the backhaul links 120 (e.g., via X2, Xn, or other interfaces) directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0074] One or more of the base stations 105 described herein may include or be referred to by a person of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB, evolved NodeB), a next generation NodeB or a Gigabit NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home eNodeB or other appropriate terms.

[0075] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device or a user device, or some other appropriate terminology, where "device" may also be referred to as a unit, a station, a terminal or a client, as well as other examples. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, as well as other examples, which may be implemented in various items such as home appliances, or vehicles, meters, and other examples.

[0076] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays, as well as base stations 105 and network devices including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, such as Figure 1 as shown in .

[0077] The UE 115 and the base station 105 can communicate with each other wirelessly via one or more communication links 125 through one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources with a defined physical layer structure for supporting the communication link 125. For example, the carrier used for the communication link 125 may include a portion of the radio frequency spectrum band (e.g., bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel can carry acquisition signaling (e.g., synchronization signals, system information), control signaling to coordinate operations for the carrier, user data, or other signaling. The wireless communication system 100 can use carrier aggregation or multi-carrier operation to support communication with the UE 115. According to the carrier aggregation configuration, the UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0078] The signal waveform transmitted by the carrier wave may be composed of multiple subcarriers (e.g., using a multicarrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate for the UE 115. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity used for communications with the UE 115.

[0079] The time interval for the base station 105 or the UE 115 may be expressed in multiples of a basic time unit (which may refer to, for example, T s =1 / (Δf max ·N f ) seconds sampling period), where Δf max It can indicate the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames, each radio frame having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0080] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into multiple time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include multiple symbol periods (e.g., depending on the length of the cyclic prefix appended to the front of each symbol period). In some wireless communication systems 100, a time slot may be further divided into multiple micro-time slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., N f ) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or the operating band.

[0081] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100, and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0082] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0083] In some examples, the base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0084] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication, and can be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include prioritizing services, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency can be used interchangeably herein.

[0085] In some examples, UE 115 may also be able to communicate directly with other UE 115 via a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105, or may not otherwise be able to receive transmissions from a base station 105. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some examples, a base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving a base station 105.

[0086] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. The operator IP service 150 may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0087] Some of the network devices, such as the base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 through one or more other access network transport entities 145, which may be referred to as a radio head, a smart radio head, or a transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., a radio head and ANC), or combined in a single network device (e.g., a base station 105).

[0088] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures enough for a macro cell to provide service to a UE 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) than transmission using the lower frequencies and longer wavelengths of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0089] The wireless communication system 100 can utilize licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5GHz industrial, scientific and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices such as base stations 105 and UE 115 can use carrier sensing for conflict detection and avoidance. In some examples, operation in an unlicensed band can be based on a carrier aggregation configuration combined with component carriers operating in a licensed band (e.g., LAA). Operations in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, as well as other examples.

[0090] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at a variety of geographic locations. The base station 105 may have an antenna array having a number of rows and columns of antenna ports, and the base station 105 may use the antenna array to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays, which may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0091] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or control an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular orientation with respect to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or the receiving device, or with respect to some other orientation).

[0092] In some examples, the UE may receive from a base station an indication of a set of SRS parameters corresponding to a set of SRS resources for sending one or more SRSs, wherein the set of SRS resources may refer to frequency (e.g., physical resource block (PRB) index, or subcarrier index) or time (e.g., orthogonal frequency division multiplexing (OFDM) symbol index) or both. In some examples, in addition to other examples, the SRS parameters may include frequency allocation, frequency overlap parameters, the number of allocated symbols, comb values, cyclic shifts, comb offsets, frequency hopping parameters, repetition parameters, symbol grouping parameters, or any combination thereof. The UE may determine one or more SRS configurations for one or more SRSs based on the set of SRS parameters. In some examples, in addition to other examples, one or more SRS configurations may include configurations for SRS frequency hopping or SRS repetition or both. The UE may send at least some of the one or more SRSs to the base station based on the SRS configuration.

[0093] Figure 2 According to various aspects of the present disclosure, an example of a wireless communication system 200 supporting enhanced SRS resource configuration is shown. The wireless communication system 200 may include a base station 105-a and a UE 115-a. The base station 105-a may be a reference Figure 1 The example of base station 105 described above, UE 115-a may be a reference Figure 1 Examples of UE 115 described herein. Base station 105-a may serve geographic coverage area 110-a. In some examples, base station 105-a may implement enhanced SRS resource configuration. For example, base station 105-a may send a set of SRS parameters to UE 115, which UE 115 may use to determine one or more SRS transmission configurations. Additionally or alternatively, other wireless devices such as UE 115-a may implement enhanced SRS resource configuration. The examples described herein do not include an exhaustive list. More examples may be possible. References Figures 2 to 6 Any of the described examples may be used in any combination with each other.

[0094] Prior to sending one or more SRS, the UE 115 may receive a set of parameters associated with a set of SRS resources from the base station 105. For example, the UE 115-a may receive one or more SRS parameter messages 215 (e.g., RRC signaling) via a downlink signal 205 that may indicate a set of SRS parameters. In some examples, the UE 115 may be configured with one or more (e.g., multiple SRS resources grouped in an SRS resource set depending on the application (e.g., antenna switching, codebook-based communication, non-codebook-based communication, beam management)). For example, the UE 115 may be configured with multiple SRS resource sets, each of which may include one or more resources, wherein one of the groups may be configured for antenna switching, and another group may be configured for codebook-based SRS. The resources that the UE 115 is configured with may refer to time and frequency resources, such as PRB indices, subcarrier indices, symbol indices (e.g., OFDM symbol indices), etc.

[0095] Based on the received SRS parameters, UE 115-a can determine one or more SRS configurations for one or more SRS transmissions. In some examples, the one or more SRS transmissions can include multiple SRS transmissions in one or more of multiple symbols, multiple PRBs, multiple subcarriers, etc.

[0096] In some other implementations, the UE 115-a may be limited to transmitting SRS in 1, 2, or 4 adjacent symbols, the SRS may be limited to the last 6 symbols of a slot, and may be transmitted only after the PUSCH of a slot is transmitted. For example, the UE 115-a may send an SRS transmission 220 to the base station 105-a via uplink signaling 210. Figure 2 In the example resource grid depicted in , where the y-axis is the PRB index and the x-axis is the symbol index, UE 115-a may send SRS transmissions using a number of symbols (e.g., the last four symbols) in the resource blocks and time slots in the sounding bandwidth. In some examples, the sounding bandwidth may include 48 PRBs. PRBs may be divided into smaller units, such as subcarriers, where 1 PRB may be associated with one or more subcarriers (e.g., 12 subcarriers). As such, as depicted in the grid with subcarrier index and symbol index axes for SRS transmissions, UE 115-a may configure SRS resources at the subcarrier level.

[0097] For example, UE 115-a may configure SRS transmissions in some symbols (e.g., the last four symbols) of a time slot with frequency hopping and repetition supported for up to four symbols, with equal SRS repetition grouping, with similar comb values ​​across SRS transmissions in a pair, with similar cyclic shifts for SRS transmissions in a pair, and without frequency overlap. UE 115-a may configure the same SRS transmission for each time slot. For example, Figure 2 As depicted in , UE 115-a can send repeated SRS transmissions having a comb value of 4 and a repetition factor of 4, where each SRS transmission in adjacent symbols in the same subcarrier (e.g., each SRS transmission of four repeated SRS transmissions) can have the same comb value and the same offset value.

[0098] In order to more efficiently utilize SRS resources and increase SRS flexibility, the base station 105 can configure the UE to support more flexible SRS configurations and parameters. In this regard, the base station 105-a can send an indication of a set of parameters (e.g., one or more bit values, one or more fields including an indication, information associated with an index or value pointing to one or more SRS parameters stored at the UE), the set of parameters itself, or both) to the UE 115-a. In some examples, the set of parameters may include an indication that the UE 115-a can be configured to support SRS hopping and repetition for a number of symbols (such as greater than 4 symbols or up to 14 symbols or both). Repetition can refer to more than one SRS in the same SRS sent in one or more symbols (e.g., adjacent symbols). Hopping can refer to the UE 115 using different parts of the subcarrier to, for example, send SRS signals in different symbols. In some examples, the number of symbols that can be used for SRS hopping and repetition can be 1 or can be an even number (such as 2, 4, 6, 8, 10, 12, or 14). The following example table (Table 1) may indicate possible configurations for up to 14 symbols.

[0099]

[0100] Table 1: Supported SRS resource configurations

[0101] For an SRS resource having one or more symbols (e.g., Ns symbols), frequency hopping may be configured for one or more repetitions (e.g., R repetitions), wherein intra-slot hopping, inter-slot hopping, or both may be supported for at least some (if not each) of the antenna ports of the SRS resource that may be mapped to one or more different groups of subcarriers across one or more pairs (e.g., Ns / R pairs) of R adjacent symbols (e.g., OFDM symbols) of the resource in each time slot. In some examples, at least some (if not each) of the antenna ports of the SRS resource may be mapped to the same group of subcarriers, e.g., within each pair of R adjacent symbols of the resource in each time slot. In some examples, another option may support this configuration in the event that the number of symbols divided by the number of repetitions is not equal to a whole number (e.g., 6 symbols divided by 4 repetitions is 1.5). In some examples, the UE 115-a may be configured to support non-uniform grouping for SRS frequency hopping and repetition. In some examples, non-uniform grouping may be supported by a configuration marked "Other" in the table.

[0102] Additionally or alternatively, in addition to other examples, UE 115-a may be configured to support different comb values, different cyclic shift values, different comb offset values, or different cyclic shift offset values ​​for one or more SRS resources. Additionally or alternatively, UE 115-a may be configured to support partial frequency overlap between symbols of different frequency hopping. Additionally or alternatively, UE 115-a may be configured to support different parameter assignments across time slots. Additionally or alternatively, UE 115-a may be configured to receive SRS resource parameters via signaling (such as RRC signaling, signaling including DCI, or signaling related to MAC-CE). In some examples, UE 115-a may be configured to receive a first (e.g., original) SRS configuration via RRC signaling, and to receive a second (e.g., updated) set of SRS parameter sets via DCI or MAC-CE. In some examples, UE 115-a may receive a first SRS configuration via DCI or MAC-CE.

[0103] Figure 3A , Figure 3B , Figure 3C and Figure 3D According to various aspects of the present disclosure, examples of SRS resource configurations 300, 301, 302, and 303 that support enhanced SRS resource configuration are shown. The SRS resource configurations 300, 301, 302, and 303 may be configured by a base station or a UE, and the base station or the UE may be as described in reference Figure 1 and Figure 2Examples of base stations and UEs described herein. The x-axis may be time resources (e.g., OFDM symbols), and the y-axis may be frequency resources (e.g., subcarriers). In some examples, the base station may implement enhanced SRS resource configuration. For example, the base station may send a set of SRS parameters to the UE, which the UE may use to determine one or more SRS transmission configurations. Additionally or alternatively, other wireless devices such as UEs may implement enhanced SRS resource configuration. The examples described herein do not include an exhaustive list. More examples may be possible. References Figures 2 to 6 Any of the described examples may be used in any combination with each other.

[0104] In some examples, in order to efficiently utilize SRS resources, the UE may be configured to support non-uniform grouping for SRS frequency hopping and repetition. For example, an SRS resource having one or more symbols, such as Ns symbols (e.g., 1, 2, 4, 6, 8, 10, 12, 14 symbols) in which frequency hopping is configured, may be mapped to a plurality of SRS resources spanning R for each hop. i subcarriers of different groups of adjacent symbols, where i=0, 1, ..., M, and M can be the number of hops (e.g., frequency hopping). i Each of the antenna ports of the SRS resource may be mapped to the same set of subcarriers within adjacent symbols. In some examples, the base station or UE may configure the number of hops, or the number of adjacent symbols (e.g., OFDM symbols), or both for each hop. For example, the UE may configure SRS resources in which the number of SRS repetitions per subcarrier may be different, such that a first subcarrier may be configured with a single SRS transmission, a second subcarrier may be configured with a pair of repeated SRS transmissions, and a third subcarrier may be configured with a single SRS transmission, etc.

[0105] In some examples, the UE may be configured to send one or more SRS signals in one or more symbols (e.g., four SRS signals in four adjacent symbols). The UE may be configured to send SRS signals with a frequency hopping of 3, and 2 of the 4 SRS signals may be repeated versions.

[0106] In some examples, the UE may be configured to send an SRS signal according to symbol grouping parameters 1 / 1 / 2. For example, the UE may configure SRS transmission as follows: Figure 3A As depicted in , the first SRS signal of the first hop is a single SRS signal, the second SRS signal of the second hop is a single SRS signal, and the third SRS signal and the fourth SRS signal of the third hop are repeated SRS signals.

[0107] In some examples, the UE may configure the SRS signal according to the symbol grouping parameter 2 / 1 / 1, and the UE may configure the SRS transmission as follows: Figure 3B As depicted in , the first SRS signal and the second SRS signal of the first hop are repeated SRS signals, the third SRS signal of the second hop is a single SRS signal, and the fourth SRS signal of the third hop is a single SRS signal. In some examples, the UE can configure the SRS signal according to the symbol grouping parameter 1 / 2 / 1, which is not shown in the example.

[0108] In some examples, the UE may be configured to send six SRS signals in six adjacent symbols. The UE may be configured to send an SRS signal with a frequency hopping of 2. In such a case, the UE may be configured to send an SRS signal according to a symbol grouping parameter of 1 / 5, where the first SRS signal is a single SRS transmission in the first hop, and the SRS signals in the next five symbols of the second hop are repeated versions of the SRS signal. Additionally or alternatively, the symbol grouping parameter may be 5 / 1, 2 / 4, or 4 / 2.

[0109] Additionally or alternatively, UE 115-a may be configured to support different comb values, cyclic shift values, or comb offset values ​​for SRS within one SRS resource. In some examples, the UE may be configured to send repeated SRS with different comb values, different cyclic shifts, different comb offsets, different cyclic offsets, and the like. The comb value may be the spacing between subcarriers for one or more SRS, including for one SRS. For example, a comb value of three would indicate that for every three subcarriers in an OFDM symbol, an SRS is present in the first subcarrier in the group of three subcarriers. The comb offset may refer to the starting subcarrier in the sounding bandwidth. For example, a comb offset of zero configures the first SRS in an OFDM symbol to be sent in the first subcarrier of the sounding bandwidth (e.g., from the bottom). A cyclic shift is a shift across an antenna group, where there may be a phase offset when a signal is transmitted on one antenna.

[0110] For example, an SRS resource in a first symbol may be assigned a first comb value, and a repeated SRS resource in a second symbol may be assigned a second comb value. As such, within R adjacent symbols, different comb values, different cyclic shifts, different comb offsets, or different cyclic shift offsets may be used to generate an SRS sequence, and map the SRS sequence to space-time-frequency resources. In some examples, a second UE may be assigned the same time and frequency resources, but the second UE may use (e.g., be assigned) a different comb value, etc., so that the second UE may be multiplexed with the first UE to transmit in the same set of resources.

[0111] In some examples, the UE may be configured to transmit two SRS signals in two adjacent symbols. The UE may be configured to transmit an SRS signal with a repetition factor of two, where the SRS in the first symbol is assigned a comb value of four and the SRS in the second symbol is assigned a comb value of two. In some examples, the UE may configure SRS transmission as follows: Figure 3C As depicted in , the SRS in the second symbol from the right is transmitted according to the comb value of four, and the SRS in the first symbol from the right is transmitted according to the comb value of two.

[0112] In some examples, the UE may be configured to send multiple SRS signals in multiple symbols, such as two SRS signals in two adjacent symbols. The UE may be configured to send an SRS signal with a repetition factor (such as a repetition factor of two), wherein the SRS in a first symbol may be assigned a first comb value (e.g., four), and the SRS in a second symbol may be assigned a second comb value (e.g., two). In some examples, the SRS in the first symbol may be assigned a comb offset value of one subcarrier, and the SRS in the second symbol may be assigned a comb offset value of zero subcarriers. In some examples, the UE may configure SRS transmission such as Figure 3D As depicted in , the SRS in the second symbol from the right can be sent according to a comb value of four, where the first SRS from the bottom is shifted up by one subcarrier according to the comb offset value, and the SRS in the first symbol from the right can be sent according to a comb value of two, where the first SRS from the bottom is not shifted according to the comb offset value.

[0113] In some examples, the UE may be configured to send two SRS signals in two adjacent symbols. The UE may be configured to send SRS signals with a repetition factor of two, where the SRS in the first symbol may be assigned a cyclic offset of zero and the SRS in the second symbol may be assigned a cyclic offset of four. Figure 3A , Figure 3B , Figure 3C and Figure 3D The examples described are not an exhaustive list, and any number of examples and permutations may be possible.

[0114] Figure 4A , Figure 4B , Figure 4C and Figure 4D Examples of SRS resource configurations 400, 401, 402, and 403 that support enhanced SRS resource configuration are shown according to various aspects of the present disclosure. The SRS resource configurations 400, 401, 402, and 403 may be configured by a base station or a UE, and the base station or the UE may be as described in reference Figure 1 and Figure 2 Examples of base stations and UEs described herein. The x-axis may be time resources (e.g., OFDM symbols), and the y-axis may be frequency resources (e.g., subcarriers). In some examples, the base station may implement enhanced SRS resource configuration. For example, the base station may send a set of SRS parameters to the UE, which the UE may use to determine one or more SRS transmission configurations. Additionally or alternatively, other wireless devices such as UEs may implement enhanced SRS resource configuration. The examples described herein do not include an exhaustive list. More examples may be possible. References Figures 2 to 6 Any of the described examples may be used in any combination with each other.

[0115] In some examples, the UE may be configured to support partial frequency overlap between symbols of different frequency hopping. In some examples, for at least two frequency hopping, subcarriers in different symbols may overlap at least partially in frequency. In some examples, the overlap may be a portion of at least one subcarrier or at least a portion of one or more subcarriers. In some examples, the overlap bandwidth may be the same for every R adjacent symbols. In some examples, the overlap bandwidth may be different for every R adjacent symbols. In some examples, the overlap bandwidth may be some combination of the same and different for every R adjacent symbols.

[0116] For example, Figure 4A As depicted in , the UE may be configured to send one or more SRSs in one or more frequency hopping, such as four SRSs in four frequency hopping. Each of the four SRSs may be configured such that there is an equal fractional frequency overlap, resulting in one or more fractional overlaps, such as three fractional overlaps.

[0117] In another example, if Figure 4B As depicted in , the UE may be configured to send four SRSs in four frequency hops. The UE may configure the SRSs so that there are two partial frequency overlaps. For example, one partial frequency overlap may be between the first two SRSs, and another partial frequency overlap may be between the second two SRSs, wherein the middle two SRSs may not overlap. The partial overlap may be the same between the first two SRSs and the second two SRSs, or the partial overlap may be different.

[0118] In another example, if Figure 4C As depicted in , the UE may be configured to send four SRSs in four hop frequencies. The UE may configure the SRSs so that there is at least one partial frequency overlap between the first two SRSs in the first hop frequency and the second hop frequency. One or more SRSs in different hop frequencies (such as the remaining SRSs) may not overlap.

[0119] In another example, if Figure 4D As depicted in , the UE may be configured to send four SRSs in four frequency hops. The UE may configure the SRSs to have one or more different partial frequency overlaps. The first two SRSs may be repeated SRSs with full frequency overlap, and the second two SRSs in the second two frequency hops may partially overlap in frequency. In some examples, the middle two SRSs may not overlap.

[0120] Figure 5A and Figure 5B According to various aspects of the present disclosure, examples of SRS resource configurations 500 and 501 that support enhanced SRS resource configuration are shown. The SRS resource configurations 500 and 501 may be configured by a base station or a UE, and the base station or the UE may be as described in reference Figure 1 and Figure 2 Examples of base stations and UEs described herein. The x-axis may be time resources (e.g., OFDM symbols), and the y-axis may be frequency resources (e.g., subcarriers). In some examples, the base station may implement enhanced SRS resource configuration. For example, the base station may send a set of SRS parameters to the UE, which the UE may use to determine the SRS transmission configuration. Additionally or alternatively, other wireless devices such as UEs may implement enhanced SRS resource configuration. The examples described herein do not include an exhaustive list. More examples may be possible. References Figures 2 to 6 Any of the described examples may be used in any combination with each other.

[0121] In some implementations, the UE may be configured to support different parameter assignments across time slots, e.g., for periodic or semi-persistent SRS configurations. For example, UE 115-a may configure a first time slot with one or more of a frequency assignment, a comb value, a comb offset, a frequency hopping parameter, a repetition parameter, etc., and may configure a second time slot with one or more of a frequency assignment, a comb value, a comb offset, a frequency hopping parameter, a repetition parameter, etc., wherein the parameter values ​​assigned to the first time slot may be the same or different than the parameter values ​​assigned to the second time slot, or some combination of the two. In some examples, for periodic or semi-persistent SRS configurations, the parameters may be changed periodically or by a predefined order according to one or more indexes (such as a frame or time slot index).

[0122] For example, Figure 5AAs depicted in , the UE may be configured with periodic or semi-persistent SRS on one or more time slots, such as three time slots. In each of the time slots, the UE may be configured to arrange the SRS on a number of symbols and a number of hops, such as four OFDM symbols and with three hops. Each of the time slots may be arranged differently in some examples, but according to the symbol parameters and the hopping parameters. The first time slot may be configured according to a 1 / 1 / 2 conforming grouping, such that there may be one SRS in the first symbol of the first hop, one SRS in the second symbol of the second hop, and two SRS in the third symbol and the fourth symbol of the third hop.

[0123] The second time slot may be configured to be different from the first time slot or the same as the first time slot. In some examples, the second time slot may be configured according to a 1 / 2 / 1 conformance grouping such that there may be one SRS in the first symbol of the first hop, two SRS in the second symbol and the third symbol of the second hop, and one SRS in the fourth symbol of the third hop.

[0124] The third time slot may be configured differently than the first time slot or the second time slot or both, or the third time slot may be configured similarly to the first time slot or the second time slot or both, or any combination of these. In some examples, the third time slot may be configured according to a 2 / 1 / 1 conforming grouping such that there may be two SRSs in the first symbol and the second symbol of the first hop, one SRS in the third symbol of the second hop, and one SRS in the fourth symbol of the third hop.

[0125] In some embodiments, Figure 5B As depicted in , the UE may be configured with periodic or semi-persistent SRS over two time slots. In each of the time slots, the UE may be configured to place the SRS on one or more symbols (such as one or more OFDM symbols) with different comb values. For example, the UE may configure the SRS of the first time slot to have a first comb value (e.g., of four), and configure the SRS of the second time slot to have a second comb value (e.g., of two). In some examples, the UE may be configured with more than two time slots, and the comb values ​​for at least some of the time slots (if not every time slot in the time slots) may follow a pattern such that the comb values ​​for at least some of the time slots (if not every time slot) may switch between a first value (e.g., two) and a second value (e.g., four) for each new time slot (e.g., four, two, four, two, four, two).

[0126] Figure 6An example of a process flow 600 for supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. The process flow 600 may illustrate an example SRS configuration scheme. For example, a base station 105-b may assign a set of SRS parameters to a UE 115-a. The base station 105-b and the UE 115-b may be reference Figure 1 and Figure 2 Examples of corresponding wireless devices described. In some examples, instead of base station 105-b implementing the SRS configuration scheme, a different type of wireless device (e.g., UE 115) can determine the SRS configuration. The following alternative examples can be implemented, in which some steps are performed in a different order than described or some steps are not performed at all. In some examples, the steps may include additional features not mentioned below, or further steps may be added.

[0127] At 605 , the base station 105 - b may determine a set of SRS resources and a set of SRS parameters corresponding to the set of SRS resources for transmitting one or more SRSs from the UE 115 b .

[0128] At 610, UE 115b may receive from base station 105-b an indication of an SRS parameter set corresponding to an SRS resource set for transmitting one or more SRSs. In some examples, the indication of the SRS parameter set may activate the SRS configuration. In some examples, the indication of the SRS parameter set may be sent via RRC signaling, or may be sent dynamically via DCI, MAC-CE, etc. In some examples, the DCI or MAC-CE may activate a predefined configuration. In some examples, the DCI or MAC-CE may be used to directly configure the SRS parameters.

[0129] At 615, UE 115-b may determine an SRS configuration for one or more SRSs based on an SRS parameter set, wherein the SRS configuration may include configuration for a number of symbols for which the SRS may be configured, non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0130] At 620 , UE 115 - b may send one or more SRSs to the base station based on the SRS configuration.

[0131] At 625, UE 115-b may optionally receive from base station 105-b an indication of an updated set of SRS parameters corresponding to a set of SRS resources for transmitting one or more SRSs. In some examples, the updated set of parameters may be received via DCI or MAC-CE. In some examples, UE 115-b may receive both the original set of parameters and the updated set of parameters via RRC signaling. Additionally or alternatively, UE 115-b may receive the original set of parameters, and update the set of parameters via DCI or MAC-CE or both. Additionally or alternatively, UE 115b may receive the original set of parameters via RRC signaling, and receive the updated set of parameters via DCI or MAC-CE.

[0132] Figure 7 A block diagram 700 of a device 705 supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. The device 705 may be an example of aspects of the UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0133] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to enhanced SRS resource configuration, etc.). The information may be communicated to other components of the device 705. The receiver 710 may be a reference Fig.10 Examples of aspects of the described transceiver 1020. The receiver 710 may utilize a single antenna or a group of antennas.

[0134] The communication manager 715 may receive an indication of an SRS parameter set corresponding to an SRS resource set for sending one or more SRSs from a base station. The communication manager 715 may determine an SRS configuration for one or more SRSs based on the SRS parameter set, wherein the SRS configuration may include a configuration for the number of symbols for which the SRSs may be configured, a non-uniform grouping for at least one SRS in one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some SRS parameters in the SRS parameters, or any combination thereof. The communication manager 715 may send one or more SRSs to the base station based on the SRS configuration. The communication manager 715 may be an example of various aspects of the communication manager 1010 described herein.

[0135] The communication manager 715 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or in any combination thereof. If implemented in code executed by a processor, a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure may perform the functions of the communication manager 715 or its subcomponents.

[0136] The communication manager 715 or its subcomponents can be physically distributed in various locations, including being distributed so that a portion of the functionality is implemented at different physical locations by one or more physical components. In some examples, according to various aspects of the present disclosure, the communication manager 715 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 715 or its subcomponents can be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof.

[0137] The transmitter 720 can transmit signals generated by other components of the device 705. In some examples, the transmitter 720 can be co-located with the receiver 710 in a transceiver component. For example, the transmitter 720 can be a reference Fig.10 Examples of aspects of the described transceiver 1020. The transmitter 720 may utilize a single antenna or a group of antennas.

[0138] The communication manager 715 as described herein may be implemented to achieve one or more potential advantages. One implementation may allow the device 705 to more efficiently configure SRS resources, and more specifically improve flexibility in SRS configuration. For example, the device 805 may receive a set of SRS parameters from a base station and determine an SRS configuration for sending an SRS to the base station, wherein the received parameters may allow the UE to more efficiently configure SRS resources.

[0139] Based on implementing the SRS configuration mechanism as described herein, the processor of the UE 115 (eg, controlling the receiver 710, the transmitter 720 or the like) Fig.10 The transceiver 1020) can increase SRS resource utilization efficiency and increase SRS resource flexibility in the configuration of SRS resources, because the number of parameters that the UE can be configured with can be increased and restrictions can be reduced.

[0140] Figure 8A block diagram 800 of a device 805 supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. The device 805 may be an example of aspects of the device 705 or UE 115 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 835. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0141] The receiver 810 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to enhanced SRS resource configuration, etc.). The information may be communicated to other components of the device 805. The receiver 810 may be a reference Fig.10 Examples of aspects of the described transceiver 1020. The receiver 810 may utilize a single antenna or a group of antennas.

[0142] Communications manager 815 may be an example of aspects of communications manager 715 as described herein. Communications manager 815 may include SRS parameter component 820, SRS configuration component 825, and SRS transmission component 830. Communications manager 815 may be an example of aspects of communications manager 1010 as described herein.

[0143] The SRS parameter component 820 may receive an indication of an SRS parameter set corresponding to an SRS resource set for transmitting one or more SRSs from a base station. The SRS configuration component 825 may determine an SRS configuration for one or more SRSs based on the SRS parameter set, wherein the SRS configuration may include a configuration for the number of symbols for which the SRS may be configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof. The SRS transmission component 830 may transmit one or more SRSs to a base station based on the SRS configuration.

[0144] The transmitter 835 can transmit signals generated by other components of the device 805. In some examples, the transmitter 835 can be co-located with the receiver 810 in the transceiver component. For example, the transmitter 835 can be a reference Fig.10 Examples of various aspects of the described transceiver 1020. The transmitter 835 may utilize a single antenna or a group of antennas.

[0145] Fig. 9A block diagram 900 of a communication manager 905 supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. The communication manager 905 may be an example of aspects of the communication manager 715, the communication manager 815, or the communication manager 1010 described herein. The communication manager 905 may include an SRS parameter component 910, an SRS configuration component 915, an SRS transmission component 920, and a DCI component 925. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0146] The SRS parameter component 910 may receive an indication of an SRS parameter set corresponding to an SRS resource set for transmitting one or more SRSs from a base station. The SRS configuration component 915 may determine an SRS configuration for one or more SRSs based on the SRS parameter set, wherein the SRS configuration may include a configuration for the number of symbols for which the SRS may be configured, a non-uniform grouping for at least one SRS in one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof. In some examples, the SRS transmission component 920 may transmit one or more SRSs to the base station based on the updated SRS configuration. The SRS transmission component 920 may transmit one or more SRSs to the base station based on the SRS configuration.

[0147] In some examples, SRS parameter component 910 may receive an indication of the number of symbols for which SRS may be configured, the number of symbols being greater than four symbols. In some examples, SRS parameter component 910 may receive an indication of the number of symbols for which SRS may be configured, the number of symbols being up to fourteen symbols.

[0148] In some examples, receiving an indication of an SRS parameter set includes receiving an indication of non-uniform grouping for one or more SRS for SRS resources in an SRS resource set or a second SRS resource set. In some examples, the SRS configuration component 915 can determine the non-uniform grouping for the one or more SRS based on receiving the indication of the non-uniform grouping. In some examples, the SRS configuration component 915 can determine that the one or more SRSs are each mapped to different groups of subcarriers across different symbols of the SRS resources.

[0149] In some examples, the SRS configuration component 915 may determine that one of the one or more SRSs is repeated on the same set of subcarriers across consecutive symbols of the SRS resource. In some examples, the SRS configuration component 915 may determine that one of the one or more SRSs is not repeated on the same set of subcarriers across consecutive symbols of the SRS resource. In some examples, the SRS configuration component 915 may determine that one of the one or more SRSs is sent on a first set of subcarriers on at least a first symbol of the SRS resource. In some examples, the SRS configuration component 915 may determine that one of the one or more SRSs is sent on a second set of subcarriers on at least a second symbol of the SRS resource.

[0150] In some examples, receiving an indication of an SRS parameter set includes receiving an indication of a comb value for one or more symbols of an SRS resource in the SRS resource set. In some examples, the SRS parameter component 910 can set a first comb value for a first symbol in the one or more symbols of the SRS resource and set a second comb value for a second symbol in the one or more symbols of the SRS resource.

[0151] In some examples, receiving an indication of an SRS parameter set includes receiving an indication of a cyclic shift value or a cyclic shift offset for one or more symbols of an SRS resource in the SRS resource set. In some examples, the SRS parameter component 910 can set a first cyclic shift value or a first cyclic shift offset for a first symbol in the one or more symbols of the SRS resource, and set a second cyclic shift value or a second cyclic shift offset for a second symbol in the one or more symbols of the SRS resource.

[0152] In some examples, receiving an indication of an SRS parameter set includes receiving an indication of a comb offset value for one or more symbols of an SRS resource in the SRS resource set. In some examples, the SRS parameter component 910 can set a first comb offset value for a first symbol in the one or more symbols of the SRS resource and set a second comb offset value for a second symbol in the one or more symbols of the SRS resource.

[0153] In some examples, receiving an indication of an SRS parameter set includes receiving an indication of a partial frequency overlap for symbols configuring SRS resources in the SRS resource set. In some examples, the SRS parameter component 910 can set a first group of subcarriers for a first symbol of the SRS resource set and set a second group of subcarriers for a second symbol of the SRS resource set, the first group of subcarriers at least partially overlapping with the second group of subcarriers.

[0154] In some examples, the SRS parameter component 910 can receive an indication of a symbol grouping parameter indicating one or more of: a number of frequency hops or a number of symbols per frequency hop for the SRS configuration. In some examples, a frequency allocation, a comb value, a cyclic shift, a cyclic shift offset, a comb offset, a frequency hopping parameter, a repetition parameter, a symbol grouping parameter, or any combination thereof.

[0155] In some examples, SRS parameters component 910 may receive RRC signaling including an indication of an SRS parameter set. In some examples, SRS parameters component 910 may receive a DCI or MAC-CE including an indication of an SRS parameter set.

[0156] In some examples, the SRS configuration component 915 may determine that each of the one or more antenna ports for the SRS resource maps to a single group of subcarriers across one or more pairs of symbols of the SRS resource. In some examples, the SRS configuration component 915 may determine that the SRS configuration is not supported based on determining that each of the one or more antenna ports for the SRS resource maps to a single group of subcarriers across one or more pairs of symbols of the SRS resource, wherein sending the one or more SRSs to the base station is based on determining that the SRS configuration is not supported. In some examples, the SRS configuration component 915 may determine non-uniform grouping for one or more SRSs based on determining that each of the one or more antenna ports for the SRS resource maps to a single group of subcarriers across one or more pairs of symbols of the SRS resource, wherein sending the one or more SRSs to the base station is based on determining non-uniform grouping for the one or more SRSs.

[0157] In some examples, the SRS configuration component 915 may set the number of frequency hopping for at least one SRS in one or more SRSs, or set the number of symbols for each frequency hopping for at least one SRS in one or more SRSs, or both. In some examples, the SRS configuration component 915 may set a third group of subcarriers for the third symbol of the SRS resource set, and the amount by which the third group of subcarriers at least partially overlaps with the second group of subcarriers is the same as the amount by which the first group of subcarriers at least partially overlaps with the second group of subcarriers. In some examples, the SRS configuration component 915 may set a third group of subcarriers for the third symbol of the SRS resource set, and the amount by which the third group of subcarriers at least partially overlaps with the second group of subcarriers is different from the amount by which the first group of subcarriers at least partially overlaps with the second group of subcarriers. In some examples, the SRS configuration component 915 may set a third group of subcarriers for the third symbol of the SRS resource set, and set a fourth group of subcarriers for the fourth symbol of the SRS resource set, and the amount by which the fourth group of subcarriers at least partially overlaps with the third group of subcarriers is the same as the amount by which the first group of subcarriers at least partially overlaps with the second group of subcarriers.

[0158] In some examples, the SRS configuration component 915 may set a third group of subcarriers for a third symbol of the SRS resource set, and a fourth group of subcarriers for a fourth symbol of the SRS resource set, the fourth group of subcarriers at least partially overlapping with the third group of subcarriers by a different amount than the first group of subcarriers at least partially overlapping with the second group of subcarriers. In some examples, the SRS configuration component 915 may set a third group of subcarriers for a third symbol of the SRS resource set, and a fourth group of subcarriers for a fourth symbol of the SRS resource set, the fourth group of subcarriers not overlapping with the third group of subcarriers. In some examples, the SRS configuration component 915 may determine a first SRS configuration for a subset of a first time slot, and determine a second SRS configuration for a subset of time slots, and wherein the SRS includes one or more of a periodic SRS or a semi-persistent SRS.

[0159] In some examples, the SRS configuration component 915 can determine one or more SRS parameters in an SRS parameter set for a first SRS configuration that are different from one or more SRS parameters in an SRS parameter set for a second SRS configuration based on a frame index, a time slot index, a periodic timing, a defined order, or any combination thereof.

[0160] In some examples, the SRS configuration component 915 may select a defined configuration based on receiving a DCI or MAC-CE. In some examples, the SRS configuration component 915 may set one or more SRS parameters in an SRS parameter set for SRS configuration based on receiving a DCI or MAC-CE. In some examples, the SRS configuration component 915 may update the SRS configuration for one or more SRSs based on a second SRS parameter set. In some examples, for a configuration of a periodic SRS or a semi-persistent SRS. The DCI component 925 may receive a DCI or MAC-CE including an indication of a second SRS parameter set.

[0161] Fig.10 A schematic diagram of a system 1000 including a device 1005 is shown according to various aspects of the present disclosure, and the device 1005 supports enhanced SRS resource configuration. The device 1005 can be an example of a device 705, a device 805, or a UE 115 as described herein, or include a component of the device 705, the device 805, or the UE 115. The device 1005 may include components for two-way voice and data communication, including components for sending transmissions and components for receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components can be in electrical communication via one or more buses (e.g., a bus 1045).

[0162] The communication manager 1010 may receive an indication of an SRS parameter set corresponding to an SRS resource set for sending one or more SRSs from a base station. The communication manager 1010 may determine an SRS configuration for one or more SRSs based on the SRS parameter set, wherein the SRS configuration may include a configuration for the number of symbols for which the SRS may be configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof. The communication manager 1010 may send one or more SRSs to the base station based on the SRS configuration.

[0163] I / O controller 1015 can manage input and output signals for device 1005. I / O controller 1015 can also manage peripheral devices that are not integrated into device 1005. In some examples, I / O controller 1015 can represent a physical connection or port to an external peripheral device. In some examples, I / O controller 1015 can utilize a processor such as a CPU, a CPU module, or a CPU core. 1005. In some examples, the I / O controller 1015 may be implemented as part of a processor. In some examples, a user may interact with the device 1005 via the I / O controller 1015 or via hardware components controlled by the I / O controller 1015.

[0164] The transceiver 1020 can communicate bidirectionally via one or more antennas, wired links, or wireless links, as described above. For example, the transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1020 can also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0165] In some examples, a wireless device may include a single antenna 1025. However, in some examples, a device may have more than one antenna 1025, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0166] The memory 1030 may include RAM and ROM. The memory 1030 may store computer-readable, computer-executable code 1035 including instructions that, when executed, cause the processor to perform the various functions described herein. In some examples, the memory 1030 may contain, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0167] Processor 1040 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some examples, processor 1040 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks that support enhanced SRS resource configuration).

[0168] The code 1035 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1035 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some examples, the code 1035 may not be directly executable by the processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0169] Fig.11 A block diagram 1100 of a device 1105 supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. The device 1105 may be an example of aspects of a base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1120. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0170] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to enhanced SRS resource configuration, etc.). The information may be communicated to other components of the device 1105. The receiver 1110 may be a reference Fig.14 Examples of various aspects of the described transceiver 1420. The receiver 1110 may utilize a single antenna or a group of antennas.

[0171] The communication manager 1115 may determine an SRS resource set for sending one or more SRSs from the UE and an SRS parameter set corresponding to the SRS resource set. The communication manager 1115 may send an indication of an SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from the UE to the UE. The communication manager 1115 may receive one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration may include a configuration for the number of symbols for which the SRSs may be configured, a non-uniform grouping for at least one SRS in one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof. The communication manager 1115 may be an example of various aspects of the communication manager 1410 described herein.

[0172] The communication manager 1115 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or in any combination thereof. If implemented in code executed by a processor, a general purpose processor, DSP, application specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure may perform the functions of the communication manager 1115 or its subcomponents.

[0173] The communication manager 1115 or its subcomponents may be physically distributed in various locations, including being distributed so that a portion of the functionality is implemented at different physical locations by one or more physical components. In some examples, according to various aspects of the present disclosure, the communication manager 1115 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1115 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof.

[0174] The transmitter 1120 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1120 may be co-located with the receiver 1110 in a transceiver component. For example, the transmitter 1120 may be a reference Fig.14 Examples of various aspects of the described transceiver 1420. The transmitter 1120 may utilize a single antenna or a group of antennas.

[0175] Fig.12A block diagram 1200 of a device 1205 supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. The device 1205 may be an example of aspects of the device 1105 or base station 105 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1235. The device 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0176] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to enhanced SRS resource configuration, etc.). The information may be communicated to other components of the device 1205. The receiver 1210 may be a reference Fig.14 Examples of various aspects of the described transceiver 1420. The receiver 1210 may utilize a single antenna or a group of antennas.

[0177] The communication manager 1215 may be an example of aspects of the communication manager 1115 as described herein. The communication manager 1215 may include an SRS resource manager 1220, an SRS parameter manager 1225, and an SRS reception manager 1230. The communication manager 1215 may be an example of aspects of the communication manager 1410 as described herein.

[0178] The SRS resource manager 1220 may determine an SRS resource set for transmitting one or more SRSs from the UE and an SRS parameter set corresponding to the SRS resource set. The SRS parameter manager 1225 may send an indication of an SRS parameter set corresponding to the SRS resource set for transmitting one or more SRSs from the UE to the UE. The SRS reception manager 1230 may receive one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration may include a configuration for the number of symbols for which the SRS may be configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0179] The transmitter 1235 can transmit signals generated by other components of the device 1205. In some examples, the transmitter 1235 can be co-located with the receiver 1210 in the transceiver component. For example, the transmitter 1235 can be a reference Fig.14 Examples of various aspects of the described transceiver 1420. The transmitter 1235 may utilize a single antenna or a group of antennas.

[0180] Fig.13 A block diagram 1300 of a communication manager 1305 supporting enhanced SRS resource configuration is shown according to aspects of the present disclosure. The communication manager 1305 may be an example of aspects of the communication manager 1115, the communication manager 1215, or the communication manager 1410 described herein. The communication manager 1305 may include an SRS resource manager 1310, an SRS parameter manager 1315, an SRS reception manager 1320, and a DCI manager 1325. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0181] The SRS resource manager 1310 may determine an SRS resource set for sending one or more SRSs from the UE and an SRS parameter set corresponding to the SRS resource set. The SRS parameter manager 1315 may send an indication of an SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from the UE to the UE. The SRS reception manager 1320 may receive one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration may include a configuration for the number of symbols for which the SRS may be configured, a non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0182] In some examples, the SRS parameter manager 1315 may send an indication of a number of symbols for which the SRS may be configured, the number of symbols being greater than four symbols. In some examples, the SRS parameter manager 1315 may send an indication of a number of symbols for which the SRS may be configured, the number of symbols being up to fourteen symbols. In some examples, the SRS parameter manager 1315 may send an indication of non-uniform grouping for one or more SRS for SRS resources in the SRS resource set or the second SRS resource set.

[0183] In some examples, the SRS parameter manager 1315 may send an indication of a comb value for one or more symbols of an SRS resource in an SRS resource set. In some examples, the SRS parameter manager 1315 may send an indication of a cyclic shift value or cyclic shift offset for one or more symbols of an SRS resource in an SRS resource set. In some examples, the SRS parameter manager 1315 may send an indication of a comb offset value for one or more symbols of an SRS resource in an SRS resource set. In some examples, the SRS parameter manager 1315 may send an indication of configuring partial frequency overlap of symbols for SRS resources in an SRS resource set.

[0184] In some examples, the SRS parameter manager 1315 may send an indication of a symbol grouping parameter indicating one or more of the following: the number of hops or the number of symbols per hop for the SRS configuration. In some examples, the SRS parameter manager 1315 may send RRC signaling including an indication of the SRS parameter set. In some examples, the SRS parameter manager 1315 may send a DCI or MAC-CE including an indication of the SRS parameter set.

[0185] In some examples, frequency allocation, comb value, cyclic shift, cyclic shift offset, comb offset, frequency hopping parameter, repetition parameter, symbol grouping parameter, or any combination thereof. In some examples, the SRS reception manager 1320 may receive one or more SRSs to the base station based on the updated SRS configuration. The DCI manager 1325 may send a DCI or MAC-CE including an indication of the second SRS parameter set.

[0186] Fig.14 A schematic diagram of a system 1400 including a device 1405 is shown according to various aspects of the present disclosure, and the device 1405 supports enhanced SRS resource configuration. The device 1405 can be an example of a device 1105, a device 1205, or a base station 105 as described herein, or include a component of the device 1105, the device 1205, or the base station 105. The device 1405 may include components for two-way voice and data communication, including components for sending and receiving communications, including a communication manager 1410, a network communication manager 1415, a transceiver 1420, an antenna 1425, a memory 1430, a processor 1440, and an inter-station communication manager 1445. These components can be in electrical communication via one or more buses (e.g., a bus 1450).

[0187] The communication manager 1410 can determine an SRS resource set for sending one or more SRSs from the UE and an SRS parameter set corresponding to the SRS resource set, send an indication of the SRS parameter set corresponding to the SRS resource set for sending one or more SRSs from the UE to the UE, and receive one or more SRSs from the UE based on the SRS configuration, wherein the SRS configuration may include a configuration for the number of symbols for which the SRS can be configured, non-uniform grouping for at least one SRS among the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof.

[0188] The network communications manager 1415 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1415 may manage the delivery of data communications for client devices (eg, one or more UEs 115).

[0189] The transceiver 1420 may communicate bidirectionally via one or more antennas, wired links, or wireless links, as described above. For example, the transceiver 1420 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1420 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0190] In some examples, a wireless device may include a single antenna 1425. However, in some examples, a device may have more than one antenna 1425, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0191] Memory 1430 may include RAM, ROM, or a combination thereof. Memory 1430 may store computer readable code 1435 including instructions that, when executed by a processor (e.g., processor 1440), cause the device to perform various functions described herein. In some examples, memory 1430 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0192] Processor 1440 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some examples, processor 1440 may be configured to operate a memory array using a memory controller. In some examples, the memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks that support enhanced SRS resource configuration).

[0193] The inter-site communication manager 1445 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1445 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1445 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0194] The code 1435 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1435 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some examples, the code 1435 may not be directly executable by the processor 1440, but rather causes a computer (e.g., when compiled and executed) to perform the functions described herein.

[0195] Fig.15 According to various aspects of the present disclosure, a flow chart illustrating a method 1500 for supporting enhanced SRS resource configuration is shown. The operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. Figures 7 to 10 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use special-purpose hardware to perform various aspects of the functions described below.

[0196] At 1505, the UE may receive from the base station an indication of an SRS parameter set corresponding to an SRS resource set for transmitting one or more SRSs. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 7 to 10 The described SRS parameter components are implemented.

[0197] At 1510, the UE may determine an SRS configuration for one or more SRSs based on an SRS parameter set, wherein the SRS configuration may include configuration for a number of symbols for which the SRS may be configured, non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration for at least some of the SRS parameters, or any combination thereof. The operations of 1510 may be performed according to methods as described herein. In some examples, aspects of the operations of 1510 may be performed by methods as described with reference to Figures 7 to 10 The described SRS configuration components are executed.

[0198] At 1515, the UE may send one or more SRSs to the base station based on the SRS configuration. The operations of 1515 may be performed according to methods as described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 7 to 10 The described SRS transmission components are performed.

[0199] Fig.16 According to various aspects of the present disclosure, a flow chart illustrating a method 1600 for supporting enhanced SRS resource configuration is shown. The operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. Figures 7 to 10 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use special-purpose hardware to perform various aspects of the functions described below.

[0200] At 1605, the UE may receive from the base station an indication of an SRS parameter set corresponding to an SRS resource set for transmitting one or more SRSs. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 7 to 10 The described SRS parameter components are implemented.

[0201] At 1610, the UE may determine an SRS configuration for one or more SRSs based on an SRS parameter set, wherein the SRS configuration may include configuration for a number of symbols for which the SRS may be configured, non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration for at least some of the SRS parameters, or any combination thereof. The operations of 1610 may be performed according to methods as described herein. In some examples, aspects of the operations of 1610 may be performed by methods as described with reference to Figures 7 to 10 The described SRS configuration components are executed.

[0202] At 1615, the UE may send one or more SRSs to the base station based on the SRS configuration. The operations of 1615 may be performed according to methods as described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 7 to 10 The described SRS transmission components are performed.

[0203] At 1620, the UE may receive a DCI or MAC-CE including an indication of a second SRS parameter set. The operations of 1620 may be performed according to methods as described herein. In some examples, aspects of the operations of 1620 may be performed as described with reference to Figures 7 to 10 The described DCI components are performed.

[0204] At 1625, the UE may update the SRS configuration for one or more SRSs based on the second SRS parameter set. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed as described with reference to Figures 7 to 10 The described SRS configuration components are executed.

[0205] At 1630, the UE may send one or more SRSs to the base station based on the updated SRS configuration. The operations of 1630 may be performed according to the methods described herein. In some examples, aspects of the operations of 1630 may be performed as described with reference to Figures 7 to 10 The described SRS transmission components are performed.

[0206] Fig.17 According to various aspects of the present disclosure, a flowchart illustrating a method 1700 for supporting enhanced SRS resource configuration is shown. The operations of the method 1700 may be implemented by the base station 105 or its components as described herein. For example, the operations of the method 1700 may be implemented by the base station 105 or its components as described herein. Figures 11 to 14In some examples, the base station may execute an instruction set to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use special-purpose hardware to perform various aspects of the functions described below.

[0207] At 1705, the base station may determine an SRS resource set and an SRS parameter set corresponding to the SRS resource set for transmitting one or more SRSs from the UE. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described with reference to Figures 11 to 14 The described SRS resource manager is implemented.

[0208] At 1710, the base station may send to the UE an indication of an SRS parameter set corresponding to an SRS resource set for transmitting one or more SRSs from the UE. The operations of 1710 may be performed according to methods as described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 11 to 14 The described SRS parameter manager is implemented.

[0209] At 1715, the base station may receive one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration may include configuration of a number of symbols for which the SRS may be configured, non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof. The operations of 1715 may be performed according to methods as described herein. In some examples, aspects of the operations of 1715 may be performed by methods as described with reference to Figures 11 to 14 The described SRS reception manager is executed.

[0210] Fig.18 According to various aspects of the present disclosure, a flowchart illustrating a method 1800 for supporting enhanced SRS resource configuration is shown. The operations of the method 1800 may be implemented by a base station 105 or a component thereof as described herein. For example, the operations of the method 1800 may be implemented by a base station 105 or a component thereof as described herein. Figures 11 to 14 In some examples, the base station may execute an instruction set to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use special-purpose hardware to perform various aspects of the functions described below.

[0211] At 1805, the base station may determine an SRS resource set and an SRS parameter set corresponding to the SRS resource set for transmitting one or more SRSs from the UE. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 11 to 14 The described SRS resource manager is implemented.

[0212] At 1810, the base station may send an indication of an SRS parameter set corresponding to an SRS resource set for sending one or more SRSs from the UE to the UE. The operations of 1810 may be performed according to methods as described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 11 to 14 The described SRS parameter manager is implemented.

[0213] At 1815, the base station may receive one or more SRSs from the UE based on an SRS configuration, wherein the SRS configuration may include configuration of a number of symbols for which the SRS may be configured, non-uniform grouping for at least one of the one or more SRSs, different SRS parameters for at least one SRS resource, partial frequency overlap of symbols for SRS resources, different SRS configurations for different subsets of time slots, or dynamic configuration of at least some of the SRS parameters, or any combination thereof. The operations of 1815 may be performed according to methods as described herein. In some examples, aspects of the operations of 1815 may be performed by methods as described with reference to Figures 11 to 14 The described SRS reception manager is executed.

[0214] At 1820, the base station may send a DCI or MAC-CE including an indication of the second SRS parameter set. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed as described with reference to Figures 11 to 14 The DCI manager described herein is used to perform the above operations.

[0215] At 1825, the base station may receive one or more SRSs destined for the base station based on the updated SRS configuration. The operations of 1825 may be performed according to methods as described herein. In some examples, aspects of the operations of 1825 may be performed as described with reference to Figures 11 to 14 The described SRS reception manager is executed.

[0216] It should be noted that the methods described herein describe possible implementations, that the operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Further, aspects of two or more of the methods may be combined.

[0217] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0218] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description herein may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0219] A general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or any combination thereof designed to perform the functions described herein may be used to implement or perform the various illustrative blocks and components described in conjunction with the disclosure herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of a microprocessor and a DSP core, or any other such configuration).

[0220] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on a computer-readable medium or sent as one or more instructions or codes on a computer-readable medium. Other examples and implementations are within the scope of the present disclosure and the claims thereto. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. The features used to implement the functions may be physically distributed at various locations, including being distributed so that a portion of the functions are implemented at different physical locations.

[0221] Computer-readable media include both non-transitory computer storage media and communication media, and communication media include any media that facilitates the transmission of computer programs from one place to another.Non-transitory storage media can be any available media that can be accessed by a general or special-purpose computer.For example, but not limited to, non-transitory computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device, or can be used to carry or store desired program code units with instructions or data structure forms and any other non-transitory media that can be accessed by a general or special-purpose computer or a general or special-purpose processor. In addition, any connection can be appropriately referred to as a computer-readable medium.For example, if the software is sent from a website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of computer-readable media. As used herein, disks and optical disks include CDs, laser disks, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks, where disks typically reproduce data magnetically, while optical disks reproduce data optically with lasers. Combinations of the above should also be included within the scope of protection of computer-readable media.

[0222] As used herein (including in the claims), "or" as used in a list item (e.g., a list item ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of protection of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0223] In the drawings, similar components or features have the same reference label. Further, individual components of the same type may be distinguished by following the reference label with a dash and a second label for distinguishing among similar components. If only the first reference label is used in the specification, the description is applicable to any of the similar components having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0224] The description set forth herein in conjunction with the accompanying drawings describes example configurations, and does not represent all examples that can be implemented, nor does it represent all examples within the scope of protection of the claims. The term "example" as used herein means "used as an example, instance, or illustration," and does not mean "preferable over other examples" or "more advantageous." Specific implementations include specific details to provide an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, in order to avoid obscuring the concepts of the described examples, known structures and devices are shown in block diagram form.

[0225] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of protection of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is given the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: receiving, from a base station, an indication of a set of sounding reference signal parameters corresponding to a set of sounding reference signal resources for transmitting one or more sounding reference signals; determining a sounding reference signal configuration for the one or more sounding reference signals based at least in part on the sounding reference signal parameter set, wherein the sounding reference signal configuration comprises configuration of a number of symbols for which the sounding reference signal is configured, non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof; and The one or more sounding reference signals are sent to the base station based at least in part on the sounding reference signal configuration, wherein a determination that the sounding reference signal configuration is not supported is based at least in part on determining that each of the one or more antenna ports for the sounding reference signal resource is mapped to a subcarrier of a single group of symbols spanning one or more pairs of the sounding reference signal resources, wherein sending the one or more sounding reference signals to the base station is based at least in part on determining that the sounding reference signal configuration is not supported.

2. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: An indication of a number of the symbols for which the sounding reference signal is configured is received, the number of symbols being greater than four symbols.

3. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: An indication of a number of the symbols for which the sounding reference signal is configured is received, the number of symbols being up to fourteen symbols.

4. The method according to claim 1, wherein: Determining the sounding reference signal configuration includes: The non-uniform grouping for the one or more sounding reference signals is determined based at least in part on determining that each of the one or more antenna ports for the sounding reference signal resources is mapped to the single group of subcarriers of the one or more pairs of symbols across the sounding reference signal resources, wherein sending the one or more sounding reference signals to the base station is based at least in part on determining the non-uniform grouping for the one or more sounding reference signals.

5. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: receiving an indication that the non-uniform grouping of the one or more sounding reference signals is used for sounding reference signal resources in the sounding reference signal resource set or a second sounding reference signal resource set, and wherein determining the sounding reference signal configuration comprises; and The non-uniform grouping for the one or more sounding reference signals is determined based at least in part on receiving an indication of the non-uniform grouping.

6. The method according to claim 5, wherein: Determining the non-uniform grouping comprises: It is determined that the one or more sounding reference signals are each mapped to different groups of subcarriers across different symbols of the sounding reference signal resource.

7. The method according to claim 6, wherein: Determining the non-uniform grouping comprises: determining that a sounding reference signal of the one or more sounding reference signals is repeated on a same set of subcarriers across consecutive symbols of the sounding reference signal resource; and A determination is made that a sounding reference signal of the one or more sounding reference signals is not repeated on a same set of subcarriers across consecutive symbols of the sounding reference signal resource.

8. The method according to claim 6, wherein: Determining the non-uniform grouping comprises: determining that a sounding reference signal of the one or more sounding reference signals is sent on a first group of subcarriers on at least a first symbol of the sounding reference signal resource; and A determination is made that a sounding reference signal of the one or more sounding reference signals is sent on a second group of subcarriers on at least a second symbol of the sounding reference signal resource.

9. The method according to claim 1, wherein: Determining the sounding reference signal configuration includes: The number of frequency hopping is set for at least one of the one or more sounding reference signals, or the number of symbols per frequency hopping is set for at least one of the one or more sounding reference signals, or both.

10. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: receiving an indication of a comb value for one or more symbols of a sounding reference signal resource in the sounding reference signal resource set, and wherein determining the sounding reference signal configuration comprises; and A first comb value is set for a first symbol of the one or more symbols of the sounding reference signal resource, and a second comb value is set for a second symbol of the one or more symbols of the sounding reference signal resource.

11. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: receiving an indication of a cyclic shift value or a cyclic shift offset for one or more symbols of a sounding reference signal resource in the sounding reference signal resource set, and wherein determining the sounding reference signal configuration comprises; and A first cyclic shift value or a first cyclic shift offset is set for a first symbol among the one or more symbols of the sounding reference signal resource, and a second cyclic shift value or a second cyclic shift offset is set for a second symbol among the one or more symbols of the sounding reference signal resource.

12. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: receiving an indication of a comb offset value for one or more symbols of a sounding reference signal resource in the sounding reference signal resource set, and wherein determining the sounding reference signal configuration comprises; and A first comb offset value is set for a first symbol of the one or more symbols of the sounding reference signal resource, and a second comb offset value is set for a second symbol of the one or more symbols of the sounding reference signal resource.

13. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: receiving an indication of configuring a partial frequency overlap of symbols for sounding reference signal resources in the sounding reference signal resource set, and wherein determining the sounding reference signal configuration comprises; and A first group of subcarriers is set for a first symbol of the sounding reference signal resource set, and a second group of subcarriers is set for a second symbol of the sounding reference signal resource set, wherein the first group of subcarriers at least partially overlaps with the second group of subcarriers.

14. The method according to claim 13, wherein: Determining the sounding reference signal configuration includes: A third group of subcarriers is set for a third symbol of the sounding reference signal resource set, wherein the third group of subcarriers at least partially overlaps with the second group of subcarriers by the same amount as the first group of subcarriers at least partially overlaps with the second group of subcarriers.

15. The method according to claim 13, wherein: Determining the sounding reference signal configuration includes: A third group of subcarriers is set for a third symbol of the sounding reference signal resource set, wherein the third group of subcarriers at least partially overlaps with the second group of subcarriers by a different amount than the first group of subcarriers at least partially overlaps with the second group of subcarriers.

16. The method according to claim 13, wherein: Determining the sounding reference signal configuration includes: A third group of subcarriers is set for a third symbol of the sounding reference signal resource set, and a fourth group of subcarriers is set for a fourth symbol of the sounding reference signal resource set, wherein the fourth group of subcarriers at least partially overlaps with the third group of subcarriers by the same amount as the first group of subcarriers at least partially overlaps with the second group of subcarriers.

17. The method according to claim 13, wherein: Determining the sounding reference signal configuration includes: A third group of subcarriers is set for a third symbol of the sounding reference signal resource set, and a fourth group of subcarriers is set for a fourth symbol of the sounding reference signal resource set, wherein the fourth group of subcarriers at least partially overlaps with the third group of subcarriers by a different amount than the first group of subcarriers at least partially overlaps with the second group of subcarriers.

18. The method according to claim 13, wherein: Determining the sounding reference signal configuration includes: A third group of subcarriers is set for a third symbol of the sounding reference signal resource set, and a fourth group of subcarriers is set for a fourth symbol of the sounding reference signal resource set, wherein the fourth group of subcarriers does not overlap with the third group of subcarriers.

19. The method according to claim 1, wherein: Determining the sounding reference signal configuration includes: A first sounding reference signal configuration for a first subset of time slots is determined, and a second sounding reference signal configuration for the subset of time slots is determined, and wherein the sounding reference signal comprises one or more of a periodic sounding reference signal or a semi-persistent sounding reference signal.

20. The method according to claim 19, wherein: Determining the first sounding reference signal configuration and the second sounding reference signal configuration includes: Determine one or more sounding reference signal parameters in a sounding reference signal parameter set for the first sounding reference signal configuration that are different from one or more sounding reference signal parameters in a sounding reference signal parameter set for the second sounding reference signal configuration based at least in part on a frame index, a time slot index, a periodic timing, a defined order, or any combination thereof.

21. The method according to claim 19, wherein: The sounding reference signal configuration includes a configuration for the periodic sounding reference signal or the semi-persistent sounding reference signal.

22. The method according to claim 1, wherein: The sounding reference signal parameter set includes frequency allocation, comb value, cyclic shift, cyclic shift offset, comb offset, frequency hopping parameter, repetition parameter, symbol grouping parameter or any combination thereof.

23. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set includes: An indication of a symbol grouping parameter is received indicating one or more of: a number of frequency hops or a number of symbols per frequency hop for the sounding reference signal configuration.

24. The method according to claim 1, wherein: Receiving the indication of the sounding reference signal parameter set further includes: Radio resource control signaling including the indication of the sounding reference signal parameter set is received.

25. The method of claim 1, wherein: Receiving the indication of the sounding reference signal parameter set further includes: Downlink control information or a medium access control control element including the indication of the sounding reference signal parameter set is received.

26. The method according to claim 25, wherein: Determining the sounding reference signal configuration includes: selecting a defined configuration based at least in part on receiving the downlink control information or the medium access control control element; or One or more sounding reference signal parameters in the sounding reference signal parameter set for the sounding reference signal configuration are set based at least in part on receiving the downlink control information or the medium access control control element.

27. The method of claim 1, further comprising: receiving downlink control information or a medium access control control element including an indication of a second sounding reference signal parameter set; updating the sounding reference signal configuration for the one or more sounding reference signals based at least in part on the second sounding reference signal parameter set; as well as The one or more sounding reference signals are sent to the base station based at least in part on the updated sounding reference signal configuration.

28. A method for wireless communication at a base station, comprising: determining a sounding reference signal resource set and a sounding reference signal parameter set corresponding to the sounding reference signal resource set for transmitting one or more sounding reference signals from a user equipment (UE); sending, to the UE, an indication of the set of sounding reference signal parameters corresponding to the set of sounding reference signal resources for sending one or more sounding reference signals from the UE; as well as The one or more sounding reference signals are received from the UE based at least in part on a sounding reference signal configuration, wherein the sounding reference signal configuration includes a configuration of a number of symbols for which the sounding reference signals are configured, a non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, a partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or a dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof, wherein the sounding reference signal configuration is determined not to be supported based at least in part on determining that each of one or more antenna ports for the sounding reference signal resource maps to subcarriers of a single group of symbols spanning one or more pairs of the sounding reference signal resources, and wherein receiving the one or more sounding reference signals from the UE is based at least in part on determining that the sounding reference signal configuration is not supported.

29. The method according to claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication of a number of the symbols for which the sounding reference signal is configured is sent, the number of symbols being greater than four symbols.

30. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication of the number of symbols for which the sounding reference signal is configured is sent, the number of symbols being up to fourteen symbols.

31. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication is sent that the non-uniform grouping of the one or more sounding reference signals is used for sounding reference signal resources in the sounding reference signal resource set or a second sounding reference signal resource set.

32. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication of a comb value for one or more symbols of a sounding reference signal resource in the sounding reference signal resource set is transmitted.

33. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication of a cyclic shift value or a cyclic shift offset for one or more symbols of a sounding reference signal resource in the sounding reference signal resource set is sent.

34. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication of a comb offset value for one or more symbols of a sounding reference signal resource in the sounding reference signal resource set is sent.

35. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication is sent regarding configuring a fractional frequency overlap of symbols for sounding reference signal resources in the sounding reference signal resource set.

36. The method of claim 28, wherein: The sounding reference signal parameter set includes: frequency allocation, comb value, cyclic shift, cyclic shift offset, comb offset, frequency hopping parameter, repetition parameter, symbol grouping parameter, or any combination thereof.

37. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set includes: An indication of a symbol grouping parameter indicating one or more of: a number of frequency hops or a number of symbols per frequency hop for the sounding reference signal configuration is sent.

38. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set also includes: Sending radio resource control signaling including the indication of the sounding reference signal parameter set.

39. The method of claim 28, wherein: Sending the indication of the sounding reference signal parameter set also includes: Downlink control information or a medium access control control element including the indication of the sounding reference signal parameter set is sent.

40. The method of claim 28, further comprising: sending downlink control information or a medium access control control element including an indication of a second sounding reference signal parameter set; as well as The one or more sounding reference signals are received to the base station based at least in part on the updated sounding reference signal configuration.

41. An apparatus for wireless communication at a user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to: receiving, from a base station, an indication of a set of sounding reference signal parameters corresponding to a set of sounding reference signal resources for transmitting one or more sounding reference signals; determining a sounding reference signal configuration for the one or more sounding reference signals based at least in part on the sounding reference signal parameter set, wherein the sounding reference signal configuration comprises configuration of a number of symbols for which the sounding reference signal is configured, non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof; and The one or more sounding reference signals are sent to the base station based at least in part on the sounding reference signal configuration, wherein a determination that the sounding reference signal configuration is not supported is based at least in part on determining that each of the one or more antenna ports for the sounding reference signal resource is mapped to a subcarrier of a single group of symbols spanning one or more pairs of the sounding reference signal resources, wherein sending the one or more sounding reference signals to the base station is based at least in part on determining that the sounding reference signal configuration is not supported.

42. An apparatus for wireless communication at a base station, comprising: processor, a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to: determining a sounding reference signal resource set and a sounding reference signal parameter set corresponding to the sounding reference signal resource set for transmitting one or more sounding reference signals from a user equipment (UE); sending, to the UE, an indication of the set of sounding reference signal parameters corresponding to the set of sounding reference signal resources for sending one or more sounding reference signals from the UE; as well as The one or more sounding reference signals are received from the UE based at least in part on a sounding reference signal configuration, wherein the sounding reference signal configuration includes a configuration of a number of symbols for which the sounding reference signals are configured, a non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, a partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or a dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof, wherein the sounding reference signal configuration is determined not to be supported based at least in part on determining that each of one or more antenna ports for the sounding reference signal resource maps to subcarriers of a single group of symbols spanning one or more pairs of the sounding reference signal resources, and wherein receiving the one or more sounding reference signals from the UE is based at least in part on determining that the sounding reference signal configuration is not supported.

43. An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving, from a base station, an indication of a set of sounding reference signal parameters corresponding to a set of sounding reference signal resources for transmitting one or more sounding reference signals; means for determining a sounding reference signal configuration for the one or more sounding reference signals based at least in part on the set of sounding reference signal parameters, wherein the sounding reference signal configuration comprises configuration of a number of symbols for which the sounding reference signal is configured, non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof; and A unit for sending the one or more sounding reference signals to the base station based at least in part on the sounding reference signal configuration, wherein a determination that the sounding reference signal configuration is not supported is based at least in part on determining that each of the one or more antenna ports for the sounding reference signal resource maps to subcarriers of a single group of symbols across one or more pairs of the sounding reference signal resources, wherein sending the one or more sounding reference signals to the base station is based at least in part on determining that the sounding reference signal configuration is not supported.

44. An apparatus for wireless communication at a base station, comprising: means for determining a sounding reference signal resource set for transmitting one or more sounding reference signals from a user equipment (UE) and a sounding reference signal parameter set corresponding to the sounding reference signal resource set; means for sending, to the UE, an indication of the set of sounding reference signal parameters corresponding to the set of sounding reference signal resources for sending one or more sounding reference signals from the UE; as well as A unit for receiving the one or more sounding reference signals from the UE based at least in part on a sounding reference signal configuration, wherein the sounding reference signal configuration includes configuration of a number of symbols for which the sounding reference signals are configured, non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof, wherein a determination that the sounding reference signal configuration is not supported is based at least in part on determining that each of one or more antenna ports for the sounding reference signal resource maps to subcarriers of a single group of symbols spanning one or more pairs of the sounding reference signal resources, and wherein receiving the one or more sounding reference signals from the UE is based at least in part on determining that the sounding reference signal configuration is not supported.

45. A non-transitory computer readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: receiving, from a base station, an indication of a set of sounding reference signal parameters corresponding to a set of sounding reference signal resources for transmitting one or more sounding reference signals; determining a sounding reference signal configuration for the one or more sounding reference signals based at least in part on the sounding reference signal parameter set, wherein the sounding reference signal configuration comprises configuration of a number of symbols for which the sounding reference signal is configured, non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof; and The one or more sounding reference signals are sent to the base station based at least in part on the sounding reference signal configuration, wherein a determination that the sounding reference signal configuration is not supported is based at least in part on determining that each of the one or more antenna ports for the sounding reference signal resource is mapped to a subcarrier of a single group of symbols spanning one or more pairs of the sounding reference signal resources, wherein sending the one or more sounding reference signals to the base station is based at least in part on determining that the sounding reference signal configuration is not supported.

46. ​​A non-transitory computer readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to: determining a sounding reference signal resource set and a sounding reference signal parameter set corresponding to the sounding reference signal resource set for transmitting one or more sounding reference signals from a user equipment (UE); sending, to the UE, an indication of the set of sounding reference signal parameters corresponding to the set of sounding reference signal resources for sending one or more sounding reference signals from the UE; as well as The one or more sounding reference signals are received from the UE based at least in part on a sounding reference signal configuration, wherein the sounding reference signal configuration includes a configuration of a number of symbols for which the sounding reference signals are configured, a non-uniform grouping for at least one of the one or more sounding reference signals, different sounding reference signal parameters for at least one sounding reference signal resource, a partial frequency overlap of symbols for a sounding reference signal resource, different sounding reference signal configurations for different subsets of time slots, or a dynamic configuration of at least some of the sounding reference signal parameters, or any combination thereof, wherein the sounding reference signal configuration is determined not to be supported based at least in part on determining that each of one or more antenna ports for the sounding reference signal resource maps to subcarriers of a single group of symbols spanning one or more pairs of the sounding reference signal resources, and wherein receiving the one or more sounding reference signals from the UE is based at least in part on determining that the sounding reference signal configuration is not supported.

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