Support for flexible detection reference signal switching capability

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. The UE may receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. The UE may transmit a reference signal according to the first reference signal resource subset or the second reference signal resource subset based at least in part on the trigger signal.

Description

[0001] Cross-references

[0002] This patent application claims priority to international patent application No. PCT / CN2020 / 097361, entitled “SUPPORT OF FLEXIBLE SOUNDING REFERENCE SIGNAL SWITCHING CAPABILITY”, filed by WANG et al. on June 22, 2020, and transfers the above application to the assignee of this application and incorporates the entire contents of the above application by reference. Technical Field

[0003] The following relates generally to wireless communications, and more particularly to support for flexible sounding reference signal switching capabilities. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems can 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 (e.g., 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 technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread 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 also be referred to as user equipment (UE)). Summary of the Invention

[0005] The described technology relates to improved methods, systems, devices and apparatus that support flexible sounding reference signal (SRS) switching capabilities. In general, the described technology provides various mechanisms to support wireless communication in a wireless network. In general, aspects of the described technology support various mechanisms that allow a more flexible approach to support dynamic configuration for reference signal switching (e.g., for SRS antenna switching). In general, a user equipment (UE) can support different SRS switching capabilities, for example, based on the number of available antennas, antenna configuration, transmit chain, receive chain, etc. of the UE. A base station can typically configure a single fixed SRS switching capability for a bandwidth part (BWP) of the UE, which may not be ideal for channel performance estimation. However, aspects of the described technology can include the base station configuring the UE with an SRS resource set (multiple SRS resource sets), the SRS resource set including a first SRS resource subset associated with a first SRS switching configuration and a second SRS resource subset associated with a second SRS switching configuration.

[0006] In one example, this may include multiple SRS resource sets, some of which are associated with a first SRS switching configuration and other SRS resource sets are associated with a second SRS switching configuration. In another example, this may include the UE being configured with an SRS resource set, wherein a first SRS resource subset of the SRS resource set is associated with a first SRS switching configuration, and a second SRS resource subset of the SRS resource set is associated with a second SRS switching configuration. The base station may send a trigger signal to the UE, which activates one or more SRS switching configurations in the SRS switching configuration. In some aspects, the trigger signal may indicate a group identifier associated with the activated SRS switching configuration, different periods (e.g., timing configurations) for the SRS switching configuration, etc. The UE may then perform SRS transmission according to the SRS resource set / SRS resources associated with the activated SRS switching configuration.

[0007] A method for wireless communication at a UE is described. The method may include receiving a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; receiving a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and transmitting a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0008] An apparatus for wireless communication at a user equipment terminal (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 a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and, based on the trigger signal, transmit a reference signal according to the first reference signal resource subset or the second reference signal resource subset.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; receiving a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and transmitting a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0010] 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 a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and, based on the trigger signal, transmit a reference signal according to the first reference signal resource subset or the second reference signal resource subset.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the configuration signal may include operations, features, units, or instructions for performing the following operations: receiving the configuration signal indicating a group of reference signal resource sets, the group of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including the first reference signal resource subset associated with the first reference signal switching configuration, and the second reference signal resource set including the second reference signal resource subset associated with the second reference signal switching configuration.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the configuration signal may include operations, features, units, or instructions for performing the following operations: receiving the configuration signal, the configuration signal indicating a first group identifier associated with the first set of reference signal resources and a second group identifier associated with the second set of reference signal resources.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the configuration signal may include operations, features, units, or instructions for performing the following operations: receiving the configuration signal, the configuration signal indicating a first period for the first reference signal resource set and a second period for the second reference signal resource set.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the trigger signal may include operations, features, units, or instructions for receiving the trigger signal to activate the first reference signal switching configuration according to the first period for the first reference signal resource set and to activate the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the trigger signal may include operations, features, units, or instructions for performing the following operations: receiving the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set, and upon expiration of the first period, the trigger signal activating the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the configuration signal may include operations, features, units, or instructions for receiving the configuration signal indicating a single set of reference signal resources, the single set of reference signal resources including at least the first subset of reference signal resources associated with the first reference signal switching configuration and the second subset of reference signal resources associated with the second reference signal switching configuration.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the configuration signal may include operations, features, units, or instructions for performing the following operations: receiving the configuration signal, the configuration signal indicating a first group of identifiers associated with the first subset of reference signal resources and a second group of identifiers associated with the second subset of reference signal resources, wherein the trigger signal activates the first subset of reference signal resources or the second subset of reference signal resources.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the configuration signal may include operations, features, units, or instructions for performing the following operations: receiving the configuration signal, the configuration signal indicating a first period for the first subset of reference signal resources and a second period for the second subset of reference signal resources.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the trigger signal may include operations, features, units, or instructions for receiving the trigger signal to activate the first reference signal switching configuration according to the first period for the first subset of reference signal resources and to activate the second reference signal switching configuration according to the second period for the second subset of reference signal resources.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the trigger signal may include operations, features, units, or instructions for performing the following operations: receiving the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set, and upon expiration of the first period, the trigger signal activating the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the configuration signal may include operations, features, units, or instructions for performing the following operations: receiving the configuration signal, the configuration signal indicating a first time slot level periodicity associated with the first reference signal resource subset and a second time slot level periodicity associated with the second reference signal resource subset, the second time slot level periodicity being different from the first time slot level periodicity.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the trigger signal may include operations, features, units, or instructions for performing the following operations: receiving the trigger signal including a group identifier, the group identifier indicating one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal may be sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the trigger signal may include operations, features, units, or instructions for performing the following operations: receiving the trigger signal including a trigger status indication, the trigger status indication being used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal may be a periodic reference signal, and the periodic reference signal may be sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger status indication.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the trigger signal includes downlink control information (DCI) or a medium access control (MAC) control element (CE).

[0025] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for sending a UE capability message indicating support for multiple reference signal switching configurations for a bandwidth part (BWP), wherein the configuration signal may be based on the UE capability message.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for sending a UE capability message indicating antenna switching capabilities of the UE, wherein the configuration signal may be based on the antenna switching capabilities.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for sending a UE capability message indicating support for multiple active reference signal switching configurations for a BWP, the multiple active reference signal switching configurations including active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is based at least in part on the UE capability message.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the reference signal may include operations, features, means, or instructions for: sending a first one or more reference signals using a first antenna configuration; and sending a second one or more reference signals using a second antenna configuration different from the first antenna configuration.

[0029] A method for wireless communication at a base station is described. The method may include: sending a configuration signal indicating one or more reference signal resource sets to a UE, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; sending a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and receiving a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0030] 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: send a configuration signal indicating one or more reference signal resource sets to a UE, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; send a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and receive a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0031] Another apparatus for wireless communication at a base station is described. The apparatus may include means for: sending a configuration signal indicating one or more reference signal resource sets to a UE, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; sending a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and receiving a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0032] 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: send a configuration signal indicating one or more reference signal resource sets to a UE, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; send a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and receive a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0033] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the configuration signal may include operations, features, units, or instructions for performing the following operations: sending the configuration signal indicating a group of reference signal resource sets, the group of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including the first reference signal resource subset associated with the first reference signal switching configuration, and the second reference signal resource set including the second reference signal resource subset associated with the second reference signal switching configuration.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the configuration signal may include operations, features, units, or instructions for performing the following operations: sending the configuration signal, the configuration signal indicating a first group identifier associated with the first set of reference signal resources and a second group identifier associated with the second set of reference signal resources.

[0035] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the configuration signal may include operations, features, units, or instructions for performing the following operations: sending the configuration signal, the configuration signal indicating a first period for the first reference signal resource set and a second period for the second reference signal resource set.

[0036] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the trigger signal may include operations, features, units, or instructions for sending the trigger signal to activate the first reference signal switching configuration according to the first period for the first reference signal resource set and to activate the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0037] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the trigger signal may include operations, features, units, or instructions for sending the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set, and upon expiration of the first period, the trigger signal activating the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0038] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the configuration signal may include operations, features, units, or instructions for sending the configuration signal indicating a single set of reference signal resources, the single set of reference signal resources including at least the first subset of reference signal resources associated with the first reference signal switching configuration and the second subset of reference signal resources associated with the second reference signal switching configuration.

[0039] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the configuration signal may include operations, features, units, or instructions for performing the following operations: sending the configuration signal, the configuration signal indicating a first group of identifiers associated with the first subset of reference signal resources and a second group of identifiers associated with the second subset of reference signal resources, wherein the trigger signal activates the first subset of reference signal resources or the second subset of reference signal resources.

[0040] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the configuration signal may include operations, features, units, or instructions for performing the following operations: sending the configuration signal, the configuration signal indicating a first period for the first subset of reference signal resources and a second period for the second subset of reference signal resources.

[0041] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the trigger signal may include operations, features, units, or instructions for sending the trigger signal to activate the first reference signal switching configuration according to the first period for the first subset of reference signal resources and to activate the second reference signal switching configuration according to the second period for the second subset of reference signal resources.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the trigger signal may include operations, features, units, or instructions for sending the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set, and upon expiration of the first period, the trigger signal activating the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0043] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the configuration signal may include operations, features, units, or instructions for sending the configuration signal, the configuration signal indicating a first slot-level periodicity associated with the first subset of reference signal resources and a second slot-level periodicity associated with the second subset of reference signal resources, the second slot-level periodicity being different from the first slot-level periodicity.

[0044] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the trigger signal may include operations, features, units, or instructions for performing the following operations: sending the trigger signal including a group identifier, the group identifier indicating one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal may be sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

[0045] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending the trigger signal may include operations, features, units, or instructions for performing the following operations: sending the trigger signal including a trigger status indication, the trigger status indication being used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal may be a periodic reference signal, and the periodic reference signal may be sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger status indication.

[0046] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the trigger signal includes a DCI or a MAC CE.

[0047] 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 UE capability message indicating support for multiple reference signal switching configurations for a BWP, wherein the configuration signal may be sent based on the UE capability message.

[0048] 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 UE capability message indicating antenna switching capabilities of the UE, wherein the configuration signal may be sent based on the antenna switching capabilities.

[0049] 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 UE capability message indicating support for multiple active reference signal switching configurations for a BWP, the multiple active reference signal switching configurations including active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is based at least in part on the UE capability message.

[0050] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving the reference signal may include operations, features, units, or instructions for receiving the first one or more reference signals using a first antenna configuration; and receiving the second one or more reference signals using a second antenna configuration different from the first antenna configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1

[0014] An example of a system for wireless communications in accordance with aspects of the present disclosure is shown.

[0052] Figure 2A and2B An example of a wireless communication system according to aspects of the present disclosure is shown.

[0053] Figure 3 Examples of sounding reference signal (SRS) switching configurations in accordance with aspects of the present disclosure are shown.

[0054] Figure 4 Examples of SRS switching configurations according to aspects of the present disclosure are shown.

[0055] Figure 5 An example of a process for supporting flexible SRS switching capability according to aspects of the present disclosure is shown.

[0056] Figure 6 and 7 A block diagram of a device according to aspects of the present disclosure is shown.

[0057] Figure 8 A block diagram of a communications manager in accordance with aspects of the present disclosure is shown.

[0058] Figure 9 A diagram illustrating a system including devices supporting flexible SRS switching capabilities in accordance with aspects of the present disclosure is shown.

[0059] Figure 10 and 11 A block diagram of a device according to aspects of the present disclosure is shown.

[0060] Figure 12 A block diagram of a communications manager in accordance with aspects of the present disclosure is shown.

[0061] Figure 13 A diagram of a system including devices according to aspects of the present disclosure is shown.

[0062] Figures 14 to 18 A flowchart illustrating a method according to aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0063] Some wireless communication systems may support reference signal switching (such as sounding reference signal (SRS) switching) to enhance channel performance estimation. For example, a user equipment (UE) may perform SRS transmission according to an SRS switching configuration. A base station may measure channel performance based on the SRS transmission to identify or otherwise determine how the channel performs to ensure continued communication with the UE. The UE may be configured to or otherwise support different SRS switching capabilities, for example based on the UE's capabilities, and report them to the base station. For example, the UE may send a UE capability message to its serving base station identifying the UE's supported SRS switching capabilities, for example, explicitly indicating or implicitly identifying, for example, by reporting the UE's number of antennas, receive chains, transmit chains, etc. However, the base station may typically configure a single fixed SRS switching capability for the UE's bandwidth part (BWP). Limiting the BWP used for communication with the UE to a single SRS switching configuration may not accurately correspond to the current and / or changing conditions of the channel between the UE and the base station.

[0064] Various aspects of the present disclosure are first described in the context of wireless communication systems. In general, various aspects of the described techniques support various mechanisms that allow for a more flexible approach to supporting dynamic configuration for reference signal switching (e.g., for SRS antenna switching, but the described techniques are not limited to SRS switching and can be used for any reference signal type). Broadly speaking, a UE can support different SRS switching capabilities, for example, based on the number of antennas, antenna configuration, transmit chain, receive chain, etc. of the UE. In some aspects, a base station can configure a UE with an SRS resource set that includes a first SRS resource subset associated with a first SRS switching configuration and a second SRS resource subset associated with a second SRS switching configuration.

[0065] In one example, this may include multiple SRS resource sets, some of which are associated with a first SRS switching configuration and other SRS resource sets are associated with a second SRS switching configuration. In another example, this may include configuring an SRS resource set for the UE, wherein a first SRS resource subset of the SRS resource set is associated with a first SRS switching configuration and a second SRS resource subset of the SRS resource set is associated with a second SRS switching configuration. The base station may send a trigger signal to the UE to activate one or more SRS switching configurations in the SRS switching configuration, for example, the trigger signal may indicate a group identifier associated with the activated / triggered SRS switching configuration. The UE may then perform SRS transmission based on the SRS resources associated with the activated SRS switching configuration.

[0066] Aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow diagrams relating to support for flexible SRS switching capabilities.

[0067] Figure 1 An example of a wireless communication system 100 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. 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 advanced LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, or communication with low-cost and low-complexity devices, or any combination thereof.

[0068] Base stations 105 may be dispersed throughout a geographic area to form wireless communication system 100 and may be devices of different forms or with different capabilities. Base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which UEs 115 and base stations 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographic area over which base stations 105 and UEs 115 may support transmission of signals according to one or more radio access technologies.

[0069] 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 of different forms or with different capabilities. Figure 1 1. Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein are capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relays, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0070] The base stations 105 can communicate with the core network 130, or with each other, or both. For example, the base stations 105 can interface with the core network 130 over one or more backhaul links 132 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 can communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via the core network 130) over backhaul links 120 (e.g., via X2, Xn, or other interfaces), or both. In some examples, the backhaul links 120 can be or include one or more wireless links.

[0071] One or more of the base stations 105 described herein may include or may be referred to by those skilled in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home evolved Node B, or other appropriate terminology.

[0072] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other appropriate terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, among 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, among other examples, which may be implemented in various items such as appliances, vehicles, meters, and other examples.

[0073] The UE 115 described herein is capable of communicating with various types of devices, such as other UEs 115, which 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 shown.

[0074] The UE 115 and the base station 105 can communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier used for the communication link 125 can include a portion of a radio frequency spectrum band (e.g., a bandwidth part (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 operation for the carrier, user data, or other signaling. The wireless communication system 100 can support communication with the UE 115 using carrier aggregation or multi-carrier operation. Depending on 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 both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0075] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations with respect to other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be placed according to a channel grid for discovery by a UE 115. A carrier may operate in a standalone mode, where the UE 115 performs initial acquisition and connection via the carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., of the same or different radio access technology) is used to anchor the connection.

[0076] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0077] A carrier may be associated with a particular bandwidth of radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a plurality of determined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). A device of the wireless communication system 100 (e.g., a base station 105, a UE 115, or both) may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of the carrier bandwidth.

[0078] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may be composed of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and 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 can be. 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 communication with the UE 115.

[0079] One or more numerologies for a carrier may be supported, where the numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for the UE 115 may be limited to the one or more active BWPs.

[0080] The basic time unit (which may be referred to as T s =1 / (Δf max ·N f ) seconds sampling period, where Δf maxIt can represent the maximum supported subcarrier spacing, and N f The time intervals for the base station 105 or the UE 115 may be expressed as multiples of a maximum supported discrete Fourier transform (DFT) size. The time intervals of the communication resources may be organized according to radio frames, each 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).

[0081] 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, the frame may be divided (e.g., in the time domain) into subframes, 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 added in front of each symbol period). In some wireless communication systems 100, the time slots may be further divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0082] 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 the form of bursts of shortened TTIs (sTTIs)).

[0083] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of time division multiplexing (TDM), frequency division multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by multiple symbol periods and may extend across the system bandwidth of a carrier or a subset of the system bandwidth. 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 the 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. The aggregation level for the control channel candidates may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the 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 .

[0084] Each base station 105 can provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots or other types of cells, or any combination thereof). The term "cell" can refer to a logical communication entity used to communicate with the base station 105 (e.g., on a carrier) and can be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other identifier) used to distinguish between adjacent cells. In some examples, a cell can also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which the logical communication entity operates. Depending on various factors (such as the capabilities of the base station 105), the scope of such a cell can range from a smaller area (e.g., a structure, a subset of a structure) to a larger area. For example, a cell can be or include a building, a subset of a building, or an external space between or overlapping the geographic coverage area 110, as well as other examples.

[0085] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs 115 that have a service subscription with a network provider that supports the macro cell. Small cells may be associated with lower-power base stations 105 than macro cells, and may operate in the same or different frequency bands (e.g., licensed, unlicensed) as the macro cells. Small cells may provide unrestricted access to UEs 115 that have a service subscription with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a home or office). A base station 105 may support one or more cells and may also support communication over one or more cells using one or more component carriers.

[0086] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0087] In some examples, base station 105 can 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 can overlap, but the different geographic coverage areas 110 can be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies can be supported by different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous network in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0088] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, the base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately aligned in time. For asynchronous operation, the base stations 105 can have different frame timing, and in some examples, transmissions from different base stations 105 may not be aligned in time. The techniques described herein can be used for either synchronous or asynchronous operation.

[0089] Some UEs 115 (e.g., MTC or IoT devices) may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that incorporate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents it to a human interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other equipment. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based service billing.

[0090] Some UEs 115 may be configured to employ a mode of operation that reduces power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power-saving deep sleep mode when not engaged in active communications, when operating over a limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside of a carrier.

[0091] 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. UE 115 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 prioritization of 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 in this article.

[0092] In some examples, UE 115 can also communicate directly with other UEs 115 over 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 can be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group can be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, groups of UEs 115 communicating via D2D communication can 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, the base station 105 facilitates the scheduling of resources for the D2D communication. In other cases, the D2D communication is performed between the UEs 115 without involving the base station 105.

[0093] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination thereof. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, the vehicles in the V2X system can communicate with roadside infrastructure (such as roadside units) or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0094] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, 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 unit (AMF)) that manages 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 unit (UPF)) that routes packets to or interconnects to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the core network 130. User IP packets may be transmitted through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0095] Some of the network devices, such as base stations 105, may include subcomponents such as access network entities 140, which may be examples of access node controllers (ANCs). 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 radio heads, smart radio heads, or transmit / receive points (TRPs). 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., radio heads and ANCs) or consolidated into a single network device (e.g., base station 105).

[0096] The wireless communication system 100 can 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 because the wavelengths range from approximately one decimeter to one meter in length. UHF waves can be blocked or redirected by buildings and environmental features, but the waves can penetrate structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves can be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using the lower frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0097] The wireless communication system 100 may also operate in the super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also referred to as centimeter bands) or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as millimeter bands). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be even smaller and more closely spaced than the UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer from even greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The technology disclosed herein may be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may differ depending on the country or regulatory agency.

[0098] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) can employ carrier sensing for conflict detection and avoidance. In some examples, operations in the unlicensed band can be based on a carrier aggregation configuration in combination with component carriers operating in a licensed band (e.g., LAA). Operations in the unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0099] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques 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 different geographical locations. The base station 105 may have an antenna array having multiple rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0100] The base station 105 or UE 115 can use MIMO communication to take advantage of multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technique may be referred to as spatial multiplexing. For example, a transmitting device may send multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) (where multiple spatial layers are sent to the same receiving device) and multi-user MIMO (MU-MIMO) (where multiple spatial layers are sent to multiple devices).

[0101] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to form or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with the device. Adjustments associated with each of the antenna elements can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0102] As part of the beamforming operation, the base station 105 or the UE 115 can use beam scanning techniques. For example, the base station 105 can use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. The base station 105 can transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 can transmit signals according to different sets of beamforming weights associated with different transmission directions. The transmissions in different beam directions can be used (e.g., by a transmitting device (such as the base station 105) or by a receiving device (such as the UE 115)) to identify the beam direction for subsequent transmission or reception by the base station 105.

[0103] Base station 105 may transmit some signals (e.g., data signals associated with a particular receiving device (e.g., UE 115)) in a single beam direction (e.g., a direction associated with the receiving device). In some examples, the beam direction associated with transmissions along the single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more of the signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 having the highest signal quality or otherwise acceptable signal quality.

[0104] In some examples, transmissions by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights used for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may send reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may be precoded or not precoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques to send signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to send signals in a single direction (e.g., to send data to a receiving device).

[0105] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from the base station 105, a receiving device (e.g., UE 115) can try multiple reception configurations (e.g., directional listening). For example, the receiving device can try multiple reception directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different sets of receive beamforming weights applied to the signals received at multiple antenna elements of the antenna array (e.g., different sets of directional listening weights), or by processing the received signals according to different sets of receive beamforming weights applied to the signals received at multiple antenna elements of the antenna array (any of the above operations can be referred to as "listening" according to different reception configurations or reception directions). In some examples, the receiving device can use a single reception configuration to receive along a single beam direction (e.g., when receiving data signals). A single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0106] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly for transmission on logical channels. The medium access control (MAC) layer can perform priority handling and multiplexing of logical channels to transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration, and maintenance of the RRC connection (which supports radio bearers for user plane data) between the UE 115 and the base station 105 or the core network 130. At the physical layer, transport channels can be mapped to physical channels.

[0107] UE 115 and base station 105 can support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received on communication link 125. HARQ can include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal to noise conditions). In some examples, a device can support same-slot HARQ feedback, wherein the device can provide HARQ feedback in a particular time slot for data received in previous symbols in that time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0108] UE 115 may receive a configuration signal indicating one or more reference signal resource sets (e.g., SRS resource sets), the one or more reference signal resource sets including at least a first reference signal resource (e.g., SRS resource) subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. UE 115 may receive a trigger signal activating at least the first reference signal switching configuration or the second reference signal switching configuration. UE 115 may transmit a reference signal according to the first reference signal resource subset or the second reference signal resource subset based at least in part on the trigger signal.

[0109] Base station 105 may send a configuration signal indicating one or more reference signal resource sets to UE 115, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. Base station 105 may send a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. Base station 105 may receive a reference signal according to the first reference signal resource subset or the second reference signal resource subset based at least in part on the trigger signal.

[0110] Figure 2A and 2B An example of a wireless communication system 200 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 200 can include a UE 205 and / or a base station 210, which can be examples of corresponding devices described herein. Figure 2AThe wireless communication system 200-a shows an example in which a UE 205 is configured with multiple reference signal resource sets (e.g., SRS resource sets), where at least one reference signal resource set is associated with a first reference signal switching configuration and another reference signal resource set is associated with a second reference signal switching configuration. Figure 2B The wireless communication system 200-b shows an example in which the UE 205 is configured with a single reference signal resource set (e.g., one SRS resource set), wherein at least one reference signal resource (e.g., one SRS resource) in the reference signal resource set is associated with a first reference signal switching configuration and another reference signal resource in the reference signal resource set is associated with a second reference signal switching configuration.

[0111] In broad terms, an SRS resource set (e.g., a reference signal resource set) may include a collection of SRS resources transmitted by a UE 205. The SRS resource set may be transmitted aperiodically, semi-persistently, and / or periodically (e.g., according to different timing configurations). Thus, a UE 205 may be configured with multiple SRS resources, which may be grouped into SRS resource sets based on use cases (e.g., antenna switching, codebook-based, non-codebook-based, beam management, etc.). In some aspects, the UE 205 may perform SRS transmissions on corresponding SRS resources in the last few symbols of a slot (e.g., in the last six symbols of a slot).

[0112] In some aspects, the UE 205 may be configured with or otherwise support different SRS switching capabilities. For example, the UE 205 may be configured with or otherwise have a single transmit chain (1T) or multiple transmit chains (e.g., 2T, 3T, 4T, etc.) available. Similarly, the UE 205 may be configured with a single receive chain (1R) or multiple receive chains (e.g., 2R, 3R, 4R, etc.). The UE 205 may also be configured with one or more antennas that can be used for transmit and / or receive chains. In addition, the UE 205 may also use antennas, transmit chains, and / or receive chains to support multiple antenna configurations. For example, the UE 205 may use various antenna configurations and corresponding transmit and / or receive chains / antennas to support directional transmission and / or reception.

[0113] In some aspects, this may support or otherwise enable the UE 205 to support different SRS switching configurations (e.g., reference signal switching configurations, such as SRS antenna switching configurations). For example, the UE 205 may send or otherwise communicate an indication of a UE capability message to the base station 210, the UE capability message indicating supported SRS switching capabilities (e.g., antenna switching capabilities of the UE 205). In one non-limiting example, this may include the UE 205 sending or otherwise communicating an indication of supported SRS transmit port switching (e.g., supportedSRS-TxPortSwitch) metrics (such as 1T2R, 2T4R, 1T4R, T=R, etc.). Based on the UE capabilities, the base station 210 may send or otherwise communicate a configuration signal to the UE 205 (e.g., using RRC signaling) that configures one or more SRS resource sets (e.g., one or more reference signal resource sets). In some examples, this may include configuring up to two SRS resource sets, each of which has two or more SRS resources transmitted in different symbols. Each SRS resource in the set of SRS resources may include or be otherwise associated with a single SRS port, wherein the SRS port of a second SRS resource in the set is associated with a different UE antenna port than the SRS port of a first SRS resource in the set.

[0114] SRS switching can enhance channel performance estimation. For example, UE 205 can perform SRS transmissions based on an SRS switching configuration. Base station 210 can measure channel performance based on the SRS transmissions to identify or otherwise determine how the channel performs to ensure continued communication with UE 205. In some aspects, base station 210 can configure UE 205 with a single SRS switching configuration for BWP. However, this approach may be less than ideal because a single SRS switching configuration may not fully determine channel performance at any given moment. In other words, a single SRS switching configuration may limit the number and / or manner in which SRSs can be transmitted across the channel, which may limit how base station 210 can measure the channel.

[0115] Thus, aspects of the described technology provide a more flexible mechanism for dynamic SRS switching configuration. Broadly speaking, aspects of the described technology can support RRC configuration for SRS resources. This can include introducing configuration of multiple groups of SRS resource sets, where some of the SRS resource sets are associated with different SRS switching capabilities (e.g., for different SRS antenna switching configurations). This can include introducing configuration of multiple groups of SRS resources within an SRS resource set, where some of the SRS resources in the set are associated with different SRS switching capabilities (e.g., for different SRS antenna switching configurations). In some aspects, this can include indication signaling, such as RRC-based periodic switching, MAC-CE and / or DCI-based switching indication (e.g., based on group indication, trigger status indication, etc.), such as trigger signal activation. In some aspects, this can include different periodic configurations based on SRS resources, UE capabilities, etc.

[0116] Broadly speaking, aspects of the described techniques may enable a base station 210 to send or otherwise communicate a configuration signal indicating one or more reference signal resource sets (e.g., SRS resource sets) to a UE 205. In some aspects, the one or more reference signal resource sets may include a first subset of reference signal resources (e.g., SRS resources) associated with a first reference signal switching configuration (e.g., SRS resources for a first SRS antenna switching configuration) and a second subset of reference signal resources associated with a second reference signal switching configuration. The base station 210 may send or otherwise communicate a trigger signal to the UE 205 (e.g., using signaling based on a DCI and / or a MAC CE) that activates the first reference signal switching configuration and / or the second reference signal switching configuration. The UE 205 may, based on the trigger signal, transmit reference signals (e.g., SRS 215, SRS 220, etc.) according to the first subset of reference signal resources (e.g., SRS resources) and / or the second subset of reference signal resources. As discussed above, in some aspects this can include the configuration signal indicating multiple sets of reference signal resources, where different sets of reference signal resources are associated with corresponding different reference signal switching configurations, and / or the configuration signal can indicate a single set of reference signal resources, where different reference signal resources in the set are associated with corresponding different reference signal switching configurations.

[0117] For example and with reference Figure 2AIn a wireless communication system 200-a, a base station 210 may send or otherwise communicate a configuration signal (e.g., via RRC signaling) to a UE 205 indicating multiple reference signal resource sets (e.g., such as a first SRS resource set 225 and a second SRS resource set 230). In some aspects, the multiple reference signal resource sets may include at least a first reference signal resource set associated with a first reference signal switching configuration and a second reference signal resource set associated with a second reference signal switching configuration. For example, the first SRS resource set 225 may include a first reference signal resource subset (e.g., SRS resources 235, SRS resources 240, etc.) associated with a first reference signal switching configuration (e.g., a first SRS antenna switching configuration). The second SRS resource 230 may include a second reference signal resource subset (e.g., SRS resources 245, SRS resources 250, etc.) associated with a second reference signal switching configuration (e.g., a second SRS antenna switching configuration). In some aspects, this may include the configuration signal indicating a first group identifier (e.g., a group ID) associated with the first reference signal resource set and a second group identifier associated with the second reference signal resource set.

[0118] therefore, Figure 2A The wireless communication system 200-a introduces multiple groups of SRS resource sets for different SRS switching capabilities (e.g., different SRS antenna switching configurations). This can allow more SRS resource sets to be configured with usage indicators that support antenna switching (e.g., antenna switching). In some aspects, this can include introducing new RRC parameters in the SRS resource set (e.g., SRS-ResourceSet) portion of RRC signaling that indicates or otherwise conveys the group identifier of the SRS resource set. In some aspects, the base station 210 can indicate to the UE 205 which group will be used for antenna switching. SRS resource sets and different groups can be configured with different SRS capabilities (e.g., with different SRS antenna switching configurations). As an example, for periodic and / or semi-persistent (e.g., timed configuration) SRS resource sets in different SRS antenna switching configuration groups, the corresponding SRS resources can be configured with different periods. As another example, for aperiodic SRS resource sets in different SRS antenna switching configuration groups, these aperiodic SRS resource sets can be triggered using different trigger slot offsets (e.g., using a configuration signal). Thus, the configuration signal may indicate a first period for the first reference signal resource set and a second period for the second reference signal resource set. That is, different timing configurations (e.g., persistent timing configuration, semi-persistent timing configuration, and / or aperiodic timing configuration) may be associated with the activated SRS resource set.

[0119] Thus, aspects of the described technology may introduce multiple groups of SRS resource sets for different SRS switching capabilities. This may include introducing or modifying RRC parameters, such as introducing a new switchingGroupID RRC parameter. Based on the switching group identifier, various other parameters used for RRC configuration may be different, including a slot offset parameter. In one non-limiting example, this may include the following RRC parameters:

[0120]

[0121]

[0122] In some aspects, a trigger signal may activate a first reference signal switching configuration according to a first period for a first reference signal resource set, and activate a second reference signal switching configuration according to a second period for a second reference signal resource set. In some examples, this may include activating both the first reference signal switching configuration and the second reference signal switching configuration, wherein each switching configuration is configured with a different period (e.g., having a different timing configuration). In some examples, this may include activating both the first reference signal switching configuration and the second reference signal switching configuration, but wherein the trigger signal activates the first reference signal switching configuration according to the first period, and upon expiration of the first period, the trigger signal activates the second reference signal switching configuration according to the second period. That is, the first reference signal switching configuration associated with the first period may be activated within x time, and upon expiration of x time, the second reference signal switching configuration associated with the second period may be automatically activated.

[0123] In some aspects, base station 210 may configure UE 205 with multiple reference signal resource sets based on the capabilities of UE 205. As discussed above, UE 205 may send or otherwise communicate a UE capability message to base station 210 identifying the SRS antenna switching capabilities of UE 205. In some aspects, the UE capability message may indicate support for multiple active reference signal switching configurations for a BWP. The multiple active reference signal switching configurations may include active reference signal switching configurations associated with different timing configurations. For example, some active reference signal switching configurations may be associated with a persistent timing configuration, other active reference signal switching configurations may be associated with a semi-persistent timing configuration, and other active reference signal switching configurations may be associated with an aperiodic timing configuration. For example, UE 205 may report its ability to support N different "active" SRS resource sets with different time-domain behaviors (e.g., aperiodic, semi-periodic, periodic) for each BWP. In one example, the UE 205 may report a value of N, where N=N1+N2+N3, which is mapped to aperiodic, semi-periodic, and periodic time-domain behaviors, respectively, to indicate how many different sets of active SRS resources the UE 205 can support per BWP for each of the different time-domain behaviors. A non-limiting example of UE capabilities reported to the base station 210 in the context of the wireless communication system 200-a is shown in Table 1 below.

[0124] UE capabilities Number of SRS resource sets used for antenna switching 1T2R 0 / 1 / 2 2T4R 0 / 1 / 2 1T4R 0 / 1 for semi-persistent or periodic 1T4R 0 / 2, for non-periodic 1T=1R 0 / 1 / 2 2T=2R 0 / 1 / 2 4T=4R 0 / 1 / 2

[0125] Table 1

[0126] Reference Figure 2B In the wireless communication system 200-b of the embodiment of the present invention, the base station 210 may send or otherwise communicate a configuration signal indicating a single set of reference signal resources (e.g., SRS resource set 255) to the UE 205. The single set of reference signal resources may include at least a first subset of reference signal resources associated with a first reference signal switching configuration (e.g., SRS resources 260) and a second subset of reference signal resources associated with a second reference signal switching configuration (e.g., SRS resources 265). For example, the configuration signal may indicate a first group identifier associated with the first subset of reference signal resources (e.g., a first group identifier associated with the first SRS antenna switching configuration) and a second group identifier associated with the second subset of reference signal resources (e.g., a second group identifier associated with the second SRS antenna switching configuration).

[0127] As also discussed above, the configuration signal may indicate a first period for a first subset of reference signal resources (e.g., for a first reference signal switching configuration) and a second period for a second subset of reference signal resources (e.g., for a second reference signal switching configuration). Thus, the trigger signal may activate the first reference signal switching configuration according to the first period and activate the second reference signal switching configuration according to the second period. For example, the trigger signal may activate both the first reference signal switching configuration and the second reference signal switching configuration to operate concurrently according to their respective periods, but with different periods. In another example, the trigger signal may activate both the first reference signal switching configuration and the second reference signal switching configuration to operate continuously according to their respective periods, e.g., the first reference signal switching configuration may operate according to the first period for x time, and upon expiration of the first period and / or x time, the second reference signal switching configuration may be automatically activated according to the second period. In some aspects, the period associated with the first and / or second reference signal switching configuration may be at a slot level (e.g., a slot-level period associated with the corresponding reference signal resource subset).

[0128] therefore, Figure 2B The wireless communication system 200-b introduces multiple groups of SRS resources within one SRS resource set for different SRS switching capabilities (e.g., for different SRS antenna switching configurations, or more simply for reference signal switching configurations). In some wireless communication systems, up to 1 / 2 / 4 SRS resources may be allowed for one SRS resource set, and when one SRS resource set is activated / triggered, all SRS resources within the SRS resource set may be activated / triggered. However, the wireless communication system 200-b allows more resources for one SRS resource set, where the SRS resources are associated with use for antenna switching. For example, new and / or modified RRC parameters in the SRS resource configuration may be used to indicate whether the SRS resource will be activated / triggered together with the SRS resource set (e.g., introducing a group identifier groupID for SRS resources within one SRS resource set). Any number of SRS resources may be activated / triggered together with the SRS resource set. For example, the base station 210 may indicate to the UE 205, for example in a trigger signal, which SRS resource group will be used for antenna switching.

[0129] Thus, aspects of the described techniques may introduce multiple sets of SRS resources for different SRS switching capabilities within one SRS resource set (e.g., SRS resource set 255). This may include introducing or modifying RRC parameters, such as introducing a new switchingGroupID RRC parameter. Based on the switching group identifier, various other parameters may be different for the RRC configuration, including periodicity and / or offset parameters (e.g., periodicityAndOffset). In one non-limiting example, this may include example RRC parameters:

[0130]

[0131]

[0132] In some aspects, the base station 210 may configure the UE 205 with a single reference signal resource set based on the capabilities of the UE 205. As discussed above, the UE 205 may send or otherwise communicate a UE capability message to the base station 210 identifying the SRS antenna switching capabilities of the UE 205. In some aspects, the UE capability message may indicate support for multiple active reference signal switching configurations for BWP. The multiple active reference signal switching configurations may include active reference signal switching configurations associated with different timing configurations. For example, some activated reference signal switching configurations may be associated with persistent timing configurations, other activated reference signal switching configurations may be associated with semi-persistent timing configurations, and other activated reference signal switching configurations may be associated with aperiodic timing configurations. A non-limiting example of UE capabilities reported to the base station 210 in the context of the wireless communication system 200-b is shown in Table 2 below.

[0133]

[0134]

[0135] Table 2

[0136] With reference to wireless communication system 200-a and / or wireless communication system 200-b, base station 210 may include a group identifier in a configuration signal to distinguish between SRS resource sets associated with different reference signal switching configurations and / or SRS resources within an SRS resource set associated with different reference signal switching configurations. Thus, in some aspects, a trigger signal may include a group identifier corresponding to the first and / or second reference signal switching configuration to indicate to UE 205 which switching configuration(s) is / are activated. In some aspects, the trigger signal may include a trigger status indication indicating the first or second reference signal switching configuration, for example, when the reference signal is an aperiodic reference signal transmitted according to the first and / or second reference signal switching configuration.

[0137] Thus, in some aspects, multiple SRS resource sets corresponding to different SRS antenna switching configurations, or a single SRS resource set including multiple SRS resource subsets corresponding to different SRS antenna switching configurations, can be activated in a trigger signal sent from base station 210 to UE 205 via a DCI, MAC CE, or the like. The trigger signal based on the DCI / MAC CE can activate / trigger different groups of SRS resource sets / SRS resources for SRS switching. This can include an indication of a group identifier, e.g., a MAC CE can select or otherwise indicate one or more group IDs for SRS switching, wherein UE 205 transmits SRS (e.g., SRS 215, SRS 220, etc.) based on the configuration of the selected or indicated group. The trigger state indication can allow different groups of aperiodic SRS transmissions for SRS switching to be configured with different trigger states. When the DCI triggers an SRS trigger state, a group of SRS resources can be used (e.g., triggered / activated for) SRS switching. UE 205 will transmit SRS based on the configuration of the selected group.

[0138] In some aspects, the techniques described with reference to wireless communication system 200-a and / or wireless communication system 200-b may be based on the capabilities of UE 205. That is, aspects of the described techniques allow UE 205 to report (e.g., in its UE capability message) whether it supports multiple antenna switching configurations per BWP. When configured by the network (e.g., when the network indicates to UE 205 a single SRS switching configuration to be used), UE 205 may fall back to a single antenna switching configuration. Accordingly, UE 205 may send or otherwise communicate a UE capability message to base station 210 indicating support for multiple reference signal switching configurations for a BWP. That is, UE 205 may send or otherwise communicate the UE's antenna switching capabilities in a UE capability message. When UE 205 is configured with multiple antenna configurations (e.g., multiple transmit and / or receive chains, antennas, etc.), UE 205 may send a first reference signal (e.g., SRS 215) using a first antenna configuration and may send a second reference signal (e.g., SRS 220) using a second antenna configuration that is different from the first antenna configuration.

[0139] Figure 3 An example of an SRS switching configuration 300 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. In some examples, the SRS switching configuration 300 can implement wireless communication systems 100 and / or 200 (e.g., Figure 2A Wireless communication system 200-a and / or Figure 2B Aspects of the SRS switching configuration 300 may be implemented by a UE and / or a base station (which may be examples of corresponding devices described herein).

[0140] As discussed above, various aspects of the described technology improve the SRS switching operations performed between the UE and the base station. For example, various aspects of the described technology provide a more flexible mechanism for dynamic SRS switching configuration. In general, various aspects of the described technology can support RRC configuration for SRS resources. In some examples, this can include introducing multiple groups of SRS resource sets for different SRS switching capabilities (e.g., for different SRS antenna switching configurations). In some examples, this can include introducing multiple groups of SRS resources for different SRS switching capabilities (e.g., for different SRS switching configurations) within an SRS resource set. In some aspects, this can include indication signaling, such as RRC-based periodic switching, MAC-CE and / or DCI-based switching indication (e.g., based on group indication, trigger status indication, etc.), such as trigger signal activation / triggering. In some aspects, this can include or be based on different SRS resource-based periodic configurations (e.g., timing configuration), UE capabilities, etc.

[0141] More specifically, aspects of the described techniques may enable a base station to send or otherwise communicate a configuration signal to a UE indicating one or more reference signal resource sets (e.g., SRS resource sets). In some aspects, the one or more reference signal resource sets may include a first subset of reference signal resources (e.g., SRS resources) associated with a first reference signal switching configuration (e.g., a first SRS antenna switching configuration) and a second subset of reference signal resources associated with a second reference signal switching configuration. The base station may send or otherwise communicate a trigger signal to the UE that activates the first reference signal switching configuration and / or the second reference signal switching configuration. The UE may, based on the trigger signal, transmit a reference signal (e.g., SRS transmission) according to the first subset of reference signal resources (e.g., SRS resources) and / or the second subset of reference signal resources. This may include the configuration signal indicating multiple reference signal resource sets, where different reference signal resource sets are associated with corresponding different reference signal switching configurations, and / or the configuration signal may indicate a single reference signal resource set, where different reference signal resources (e.g., SRS resources) in the set are associated with corresponding different reference signal switching configurations.

[0142] In some aspects, each reference signal switching configuration in the reference signal switching configuration may be associated with a corresponding group identifier (e.g., at the SRS resource set level and / or at the SRS resource level within the SRS resource set). The base station may indicate the group identifier in the trigger signal to identify which reference signal switching configuration is being activated / triggered. In some aspects, the configuration and / or trigger signal may carry or otherwise convey an indication of a unique period for each reference signal switching configuration. For example, the configuration signal may indicate a first period for a first subset of reference signal resource sets / reference signal resources and / or a second period for a second subset of reference signal resource sets / reference signal resources. Thus, the trigger signal may activate different reference signal switching configurations based on their unique periods. For example, the trigger signal may activate / trigger a first reference signal switching configuration based on a first period, activate / trigger a second reference signal switching configuration based on a second period, and so on. For example, some activated reference signal switching configurations may be associated with a persistent timing configuration, other activated reference signal switching configurations may be associated with a semi-persistent timing configuration, and other activated reference signal switching configurations may be associated with an aperiodic timing configuration.

[0143] An SRS switching configuration 300 illustrates a non-limiting example of different periods associated with corresponding reference signal switching configurations (e.g., SRS antenna switching configurations). Broadly speaking, the SRS switching configuration spans a plurality of time slots 305, of which five time slots 305 are shown by way of example only. A UE may receive a trigger signal that activates a first reference signal switching configuration according to a first period (e.g., the trigger signal may indicate a first set of identifiers corresponding to or otherwise associated with the first reference signal switching configuration) and / or activates a second reference signal switching configuration according to a second period (e.g., the trigger signal may indicate a second set of identifiers corresponding to or otherwise associated with the second reference signal switching configuration). As discussed above, the trigger signal may activate the first and second reference signal switching configurations to operate concurrently or continuously (e.g., upon expiration of a predetermined time period (such as, but not limited to, the first period), the second reference signal switching configuration is activated according to the second period).

[0144] Thus, the UE may transmit one or more reference signals according to a first periodicity and according to a first subset of reference signal resources (e.g., when a trigger signal activates a first reference signal switching configuration), and / or transmit one or more reference signals according to a second periodicity and according to a second subset of reference signal resources (e.g., when a trigger signal activates a second reference signal switching configuration). That is, the UE may perform SRS transmission 310-a (corresponding to a first group identifier associated with the first reference signal switching configuration) during time slot 305-a according to the first periodicity, and perform SRS transmission 310-b (also corresponding to the first group identifier associated with the first reference signal switching configuration) during time slot 305-e according to the first periodicity. The UE may perform SRS transmission 315 during time slot 305-c according to the second periodicity.

[0145] Thus, SRS switching configuration 300 illustrates an example of allowing periodic changes to the set of activated / triggered SRS resource sets / SRS resources. This may include new RRC parameters corresponding to the periodicity for SRS resource set / SRS resource changes. The periodicity of SRS resource sets / SRS resources within the same group (e.g., corresponding to the same group identifier) may be the same. The UE may change to another set of SRS resource sets / SRS resources for SRS switching based on the corresponding periodicity.

[0146] In some aspects, this may include an activation / trigger signal indicating two or more SRS resource sets for antenna switching in different groups simultaneously. The two or more SRS resource sets and corresponding SRS resources may be configured with different periods, slot offsets, etc.

[0147] Figure 4An example of an SRS switching configuration 400 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. In some examples, the SRS switching configuration 400 can implement aspects of the wireless communication systems 100 and / or 200 and / or the SRS switching configuration 300. Aspects of the SRS switching configuration 400 can be implemented by a UE and / or a base station (which can be examples of corresponding devices described herein).

[0148] As discussed above, various aspects of the described technology improve the SRS switching operations performed between the UE and the base station. For example, various aspects of the described technology provide a more flexible mechanism for dynamic SRS switching configuration. In general, various aspects of the described technology can support RRC configuration for SRS resources. In some examples, this can include introducing multiple groups of SRS resource sets for different SRS switching capabilities (e.g., for different SRS antenna switching configurations). In some examples, this can include introducing multiple groups of SRS resources for different SRS switching capabilities (e.g., for different SRS switching configurations) within an SRS resource set. In some aspects, this can include indication signaling, such as RRC-based periodic switching, MAC-CE and / or DCI-based switching indication (e.g., based on group indication, trigger status indication, etc.), such as trigger signal activation / triggering. In some aspects, this can include or be based on different periodic configurations based on SRS resources, UE capabilities, etc.

[0149] More specifically, aspects of the described techniques may enable a base station to send or otherwise communicate a configuration signal to a UE indicating one or more reference signal resource sets (e.g., SRS resource sets). In some aspects, the one or more reference signal resource sets may include a first subset of reference signal resources (e.g., SRS resources) associated with a first reference signal switching configuration (e.g., a first SRS antenna switching configuration) and a second subset of reference signal resources associated with a second reference signal switching configuration. The base station may send or otherwise communicate a trigger signal to the UE that activates the first reference signal switching configuration and / or the second reference signal switching configuration. The UE may, based on the trigger signal, transmit a reference signal (e.g., SRS transmission) according to the first subset of reference signal resources (e.g., SRS resources) and / or the second subset of reference signal resources (e.g., based on the trigger signal). This may include the configuration signal indicating multiple reference signal resource sets, where different reference signal resource sets are associated with corresponding different reference signal switching configurations, and / or the configuration signal may indicate a single reference signal resource set, where different reference signal resources (e.g., SRS resources) in the set are associated with corresponding different reference signal switching configurations.

[0150] In some aspects, each reference signal switching configuration in the reference signal switching configuration can be associated with a corresponding group identifier (e.g., at the SRS resource set level and / or at the SRS resource level within the SRS resource set). The base station can indicate the group identifier in the trigger signal to identify which reference signal switching configuration is being activated / triggered. In some aspects, the configuration and / or trigger signal can carry or otherwise convey an indication of a unique period for each reference signal switching configuration. For example, the configuration signal can indicate a first period for a first subset of reference signal resource sets / reference signal resources and / or a second period for a second subset of reference signal resource sets / reference signal resources. Thus, the trigger signal can activate different reference signal switching configurations based on their unique periods. For example, the trigger signal can activate a first reference signal switching configuration based on a first period, activate a second reference signal switching configuration based on a second period, and so on.

[0151] The SRS switching configuration 400 illustrates a non-limiting example of different periodicities associated with corresponding reference signal switching configurations (e.g., SRS antenna switching configurations). In some aspects, the SRS switching configuration 400 supports periodicity configuration (e.g., timing configuration) based on SRS resources. That is, the SRS switching configuration 400 allows antenna switching using different periodicity values for SRS resources in an SRS resource set. Broadly speaking, the SRS switching configuration 400 spans a plurality of time slots 405, of which seven time slots 405 are shown by way of example only. The UE may receive a trigger signal that activates a first reference signal switching configuration according to a first periodicity (e.g., the trigger signal may indicate a first group identifier corresponding to or otherwise associated with the first reference signal switching configuration) and / or activates a second reference signal switching configuration according to a second periodicity (e.g., the trigger signal may indicate a second group identifier corresponding to or otherwise associated with the second reference signal switching configuration). The first reference signal switching configuration may be associated with a first subset of reference signal resources of an SRS resource set (e.g., SRS resources 1 / 2), and the second reference signal switching configuration may be associated with a second subset of reference signal resources of the SRS resource set (e.g., SRS resources 3 / 4). As discussed above, the trigger signal may activate the first and second reference signal switching configurations to operate concurrently or continuously (e.g., upon expiration of a predetermined time period (such as, but not limited to, a first period), activating the second reference signal switching configuration according to a second period).

[0152] Thus, the UE may transmit one or more reference signals according to a first reference signal resource subset according to a first period (e.g., when a trigger signal activates a first reference signal switching configuration), and / or transmit one or more reference signals according to a second period and according to a second reference signal resource subset (e.g., when a trigger signal activates a second reference signal switching configuration). That is, the UE may perform SRS transmission 410-a during time slot 405-a, SRS transmission 410-b during time slot 405-c, SRS transmission 410-c during time slot 405-e, and SRS transmission 410-d during time slot 405-g according to the first period. In some aspects, SRS transmission 410 may correspond to a first group identifier associated with a first reference signal switching configuration that uses SRS resources 1 / 2. Similarly, the UE may perform SRS transmission 415-a during time slot 405-b and SRS transmission 415-b during time slot 405-f according to the second period. In some aspects, the SRS transmission 415 may correspond to a second set of identifiers associated with a second reference signal switching configuration that uses SRS resources 3 / 4.

[0153] Thus, the SRS switching configuration 400 illustrates an example of allowing for periodic configuration based on SRS resources. This may allow different periodicity values for SRS resources in an SRS set to be used for an SRS antenna switching configuration. For periodic and / or semi-persistent SRS transmissions, this may allow or otherwise support different periodicities for SRS resources. For example, for 1T4R, each SRS resource in an SRS resource set may include a single SRS port, and the SRS port of each SRS resource may be associated with a different UE antenna port. The periodicity of the first two SRS resources may be different from the periodicity of the second two SRS resources. The first two SRS resources (e.g., SRS 1 / 2) may be used for 1T2R SRS antenna switching.

[0154] Figure 5 An example of a process 500 for supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. In some examples, process 500 can implement aspects of wireless communication systems 100 and / or 200 and / or SRS switching configurations 300 and / or 400. Aspects of process 500 can be implemented by base station 510 and / or UE 505 (which can be examples of corresponding devices described herein).

[0155] At 515, the base station 510 may transmit (and the UE 505 may receive) a configuration signal identifying or otherwise indicating one or more reference signal resource sets. Examples of the one or more reference signal resource sets include, but are not limited to, SRS resource sets. The one or more reference signal resource sets may include a first subset of reference signal resources (e.g., SRS resources) associated with a first reference signal switching configuration and a second subset of reference signal resources associated with a second reference signal switching configuration.

[0156] In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a configuration signal indicating a plurality of reference signal resource sets. The plurality of reference signal resource sets include at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including a first subset of reference signal resources associated with a first reference signal switching configuration, and the second reference signal resource set including a second subset of reference signal resources associated with a second reference signal switching configuration. In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a configuration signal indicating a first group identifier associated with the first reference signal resource set and a second group identifier associated with the second reference signal resource set. In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a configuration signal indicating a first periodicity for the first reference signal resource set and a second periodicity for the second reference signal resource set.

[0157] In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a configuration signal indicating a single set of reference signal resources. The single set of reference signal resources may include at least a first subset of reference signal resources associated with a first reference signal switching configuration and a second subset of reference signal resources associated with a second reference signal switching configuration. In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a configuration signal indicating a first group identifier associated with the first subset of reference signal resources and a second group identifier associated with the second subset of reference signal resources. The trigger signal may activate the first subset of reference signal resources and / or the second subset of reference signal resources. In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a configuration signal indicating a first period for the first subset of reference signal resources and a second period for the second subset of reference signal resources.

[0158] In some aspects, this can include the base station 510 sending (and the UE 505 receiving) a configuration signal that indicates a first slot-level periodicity associated with the first subset of reference signal resources and a second slot-level periodicity associated with the second subset of reference signal resources, the second slot-level periodicity being different from the first slot-level periodicity.

[0159] In some aspects, this can be based on the UE 505 sending (and the base station 510 receiving) a UE capability message indicating support for multiple reference signal switching configurations for BWP. The UE capability message can indicate the antenna switching capabilities of the UE 505. In at least some aspects, the configuration signal can be based on the UE capability message.

[0160] In some aspects, this can be based on the UE 505 sending (and the base station 510 receiving) a UE capability message indicating support for multiple active reference signal switching configurations for the BWP. The multiple active reference signal switching configurations can include active reference signal switching configurations associated with different timing configurations. In at least some aspects, the configuration signal can be based on the UE capability message.

[0161] At 520, the base station 510 may transmit (and the UE 505 may receive) a trigger signal activating the first reference signal switching configuration and / or the second reference signal switching configuration. In some aspects, the trigger signal may include a DCI and / or a MAC CE.

[0162] In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a trigger signal that activates a first reference signal switching configuration according to a first periodicity for a first set of reference signal resources and activates a second reference signal switching configuration according to a second periodicity for a second set of reference signal resources. In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a trigger signal that activates the first reference signal switching configuration according to a first periodicity for a first set of reference signal resources and, upon expiration of the first periodicity, activates the second reference signal switching configuration according to the second periodicity for a second set of reference signal resources.

[0163] In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a trigger signal that activates a first reference signal switching configuration according to a first periodicity for a first subset of reference signal resources and activates a second reference signal switching configuration according to a second periodicity for a second subset of reference signal resources. In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a trigger signal that activates the first reference signal switching configuration according to a first periodicity for a first subset of reference signal resources and, upon expiration of the first period, activates the second reference signal switching configuration according to the second periodicity for a second subset of reference signal resources.

[0164] In some aspects, this may include the base station 510 sending (and the UE 505 receiving) a trigger signal including a group identifier indicating the first reference signal switching configuration and / or the second reference signal switching configuration. The reference signal may be sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

[0165] In some aspects, this may include the base station 510 transmitting (and the UE 505 receiving) a trigger signal including a trigger status indication indicating the first reference signal switching configuration and / or the second reference signal switching configuration. The reference signal may be an aperiodic reference signal transmitted according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger status indication.

[0166] At 525, the UE 505 may transmit (and the base station 510 may receive) a reference signal transmitted according to the first subset of reference signal resources or the second subset of reference signal resources, e.g., based on the triggering signal. In some aspects, this may include the UE 505 transmitting (and the base station 510 receiving) the first one or more reference signals using a first antenna configuration, and transmitting the second one or more reference signals using a second antenna configuration that is different from the first antenna configuration.

[0167] Figure 6 A block diagram 600 of a device 605 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. The device 605 can be an example of aspects of the UE 115 as described herein. The device 605 can include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0168] The receiver 610 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 support for flexible SRS switching capabilities). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The receiver 610 may utilize a single antenna or a group of antennas.

[0169] The communication manager 615 may perform the following operations: receive a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration; and, based on the trigger signal, transmit reference signals according to the first reference signal resource subset or the second reference signal resource subset. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0170] The UE communication manager 615 or its subcomponents may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by 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 designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0171] The communication manager 615 or its subcomponents can be physically located at various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be combined with one or more other hardware components (including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0172] The transmitter 620 may transmit signals generated by other components of the device 605. In some examples, the transmitter 620 may be co-located with the receiver 610 in a transceiver module. For example, the transmitter 620 may be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a group of antennas.

[0173] Figure 7A block diagram 700 of a device 705 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. The device 705 can be an example of aspects of the device 605 or UE 115 as described herein. The device 705 can include a receiver 710, a communication manager 715, and a transmitter 735. The device 705 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0174] 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 support for flexible SRS switching capabilities). The information may be passed to other components of the device 705. The receiver 710 may be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a group of antennas.

[0175] The communication manager 715 may be an example of aspects of the communication manager 615 as described herein. The communication manager 715 may include a configuration manager 720, a trigger manager 725, and an SRS manager 730. The communication manager 715 may be an example of aspects of the communication manager 910 as described herein.

[0176] The configuration manager 720 may receive a configuration signal indicating one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration.

[0177] The trigger manager 725 may receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration.

[0178] The SRS manager 730 may transmit a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0179] The transmitter 735 can transmit signals generated by other components of the device 705. In some examples, the transmitter 735 can be co-located with the receiver 710 in a transceiver module. For example, the transmitter 735 can be a reference Figure 9 Examples of aspects of the transceiver 920 are described. The transmitter 735 may utilize a single antenna or a group of antennas.

[0180] Figure 8A block diagram 800 is shown of a communication manager 805 that supports flexible SRS switching capabilities in accordance with aspects of the present disclosure. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include a configuration manager 810, a trigger manager 815, an SRS manager 820, a multiple SRS resource set configuration manager 825, a single SRS resource set configuration manager 830, a group identity trigger manager 835, a trigger state trigger manager 840, and a UE capability manager 845. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0181] Configuration manager 810 may receive a configuration signal indicating one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration.

[0182] The trigger manager 815 may receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. In some cases, the trigger signal includes a DCI or a MAC CE.

[0183] The SRS manager 820 may transmit a reference signal based on the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. In some examples, the SRS manager 820 may transmit the first one or more reference signals using a first antenna configuration. In some examples, the SRS manager 820 may transmit the second one or more reference signals using a second antenna configuration that is different from the first antenna configuration.

[0184] The multi-SRS resource set configuration manager 825 may receive a configuration signal indicating a set of reference signal resource sets, the set of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including a first reference signal resource subset associated with a first reference signal switching configuration, and the second reference signal resource set including a second reference signal resource subset associated with a second reference signal switching configuration. In some examples, the multi-SRS resource set configuration manager 825 may receive a configuration signal indicating a first group identifier associated with the first reference signal resource set and a second group identifier associated with the second reference signal resource set. In some examples, the multi-SRS resource set configuration manager 825 may receive a configuration signal indicating a first period for the first reference signal resource set and a second period for the second reference signal resource set. In some examples, the multi-SRS resource set configuration manager 825 may receive a trigger signal activating a first reference signal switching configuration based on the first period for the first reference signal resource set and activating a second reference signal switching configuration based on the second period for the second reference signal resource set. In some examples, the multi-SRS resource set configuration manager 825 can receive a trigger signal that activates a first reference signal switching configuration based on a first period for a first reference signal resource set, and upon expiration of the first period, the trigger signal activates a second reference signal switching configuration based on a second period for a second reference signal resource set.

[0185] The single SRS resource set configuration manager 830 may receive a configuration signal indicating a single reference signal resource set, the single reference signal resource set including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. In some examples, the single SRS resource set configuration manager 830 may receive a configuration signal indicating a first group identifier associated with the first reference signal resource subset and a second group identifier associated with the second reference signal resource subset, wherein the trigger signal activates the first reference signal resource subset or the second reference signal resource subset.

[0186] In some examples, the single SRS resource set configuration manager 830 may receive a configuration signal indicating a first period for a first subset of reference signal resources and a second period for a second subset of reference signal resources. In some examples, the single SRS resource set configuration manager 830 may receive a trigger signal activating a first reference signal switching configuration based on the first period for the first subset of reference signal resources and activating a second reference signal switching configuration based on the second period for the second subset of reference signal resources.

[0187] In some examples, the single SRS resource set configuration manager 830 may receive a trigger signal that activates a first reference signal switching configuration according to a first periodicity for a first subset of reference signal resources, and upon expiration of the first periodicity, activates a second reference signal switching configuration according to a second periodicity for a second subset of reference signal resources. In some examples, the single SRS resource set configuration manager 830 may receive a configuration signal that indicates a first slot-level periodicity associated with the first subset of reference signal resources and a second slot-level periodicity associated with the second subset of reference signal resources, the second slot-level periodicity being different from the first slot-level periodicity.

[0188] The group identifier trigger manager 835 can receive a trigger signal including a group identifier, the group identifier indicating one of a first reference signal switching configuration or a second reference signal switching configuration, wherein the reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

[0189] The trigger state trigger manager 840 can receive a trigger signal including a trigger state indication, which is used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is a periodic reference signal sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger state indication.

[0190] The UE capability manager 845 may send a UE capability message indicating support for multiple reference signal switching configurations for the BWP, wherein the configuration signal is based on the UE capability message.

[0191] In some examples, the UE capability manager 845 may send a UE capability message indicating the antenna switching capability of the UE, where the configuration signal is based on the antenna switching capability.

[0192] In some examples, the UE capability manager 845 may send a UE capability message indicating support for multiple active reference signal switching configurations for BWP, the multiple active reference signal switching configurations including active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is based at least in part on the UE capability message.

[0193] Figure 9A diagram of a system 900 including a device 905 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. The device 905 can be an example of, or include a component of, the device 605, device 705, or UE 115 as described herein. The device 905 can include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components can communicate electronically via one or more buses (e.g., bus 945).

[0194] The communication manager 910 can perform the following operations: receive a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; receive a trigger signal, the trigger signal activates at least the first reference signal switching configuration or the second reference signal switching configuration; and based on the trigger signal, send a reference signal according to the first reference signal resource subset or the second reference signal resource subset.

[0195] I / O controller 915 can manage input and output signals for device 905. I / O controller 915 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 can utilize a computer such as MS- OS / , or another known operating system. In other cases, I / O controller 915 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 915 may be implemented as part of a processor. In some cases, a user may interact with device 905 via I / O controller 915 or via hardware components controlled by I / O controller 915.

[0196] The transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 920 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and demodulating packets received from the antenna.

[0197] In some cases, a wireless device may include a single antenna 925. However, in some cases, the device may have more than one antenna 925 that are capable of sending or receiving multiple wireless transmissions simultaneously.

[0198] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable, computer-executable code 935, which includes instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 930 may also contain, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0199] The processor 940 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 cases, the processor 940 may be configured to operate the memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks that support support for flexible SRS switching capabilities).

[0200] The code 935 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 935 may be stored in a non-transitory computer-readable medium (e.g., system memory or other types of memory). In some cases, the code 935 may not be directly executable by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0201] Figure 10 A block diagram 1000 is shown of a device 1005 supporting flexible SRS switching capabilities according to aspects of the present disclosure. The device 1005 can be an example of aspects of the base station 105 as described herein. The device 1005 can include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0202] The receiver 1010 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 support for flexible SRS switching capabilities). The information may be communicated to other components of the device 1005. The receiver 1010 may be a reference Figure 13 Examples of various aspects of the transceiver 1320 are described. The receiver 1010 may utilize a single antenna or a group of antennas.

[0203] The communication manager 1015 may perform the following operations: sending a configuration signal indicating one or more reference signal resource sets to the UE, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; sending a trigger signal, the trigger signal activating at least the first reference signal switching configuration or the second reference signal switching configuration; and receiving a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. The communication manager 1015 may be an example of aspects of the communication manager 1310 described herein.

[0204] The communication manager 1015 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1015 or its subcomponents may be performed by a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0205] The communication manager 1015 or its subcomponents can be physically located at various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents can be combined with one or more other hardware components (including but not limited to I / O components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0206] The transmitter 1020 may transmit signals generated by other components of the device 1005. In some examples, the transmitter 1020 may be co-located with the receiver 1010 in a transceiver module. For example, the transmitter 1020 may be a reference Figure 13 Examples of various aspects of the transceiver 1320 are described. The transmitter 1020 may utilize a single antenna or a group of antennas.

[0207] Figure 11 A block diagram 1100 is shown of a device 1105 supporting flexible SRS switching capabilities according to aspects of the present disclosure. The device 1105 can be an example of aspects of the device 1005 or base station 105 as described herein. The device 1105 can include a receiver 1110, a communication manager 1115, and a transmitter 1135. The device 1105 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0208] 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 support for flexible SRS switching capabilities). The information may be communicated to other components of the device 1105. The receiver 1110 may be a reference Figure 13 Examples of various aspects of the transceiver 1320 are described. The receiver 1110 may utilize a single antenna or a group of antennas.

[0209] The communication manager 1115 may be an example of aspects of the communication manager 1015 as described herein. The communication manager 1115 may include a configuration manager 1120, a trigger manager 1125, and an SRS manager 1130. The communication manager 1115 may be an example of aspects of the communication manager 1310 as described herein.

[0210] The configuration manager 1120 may send a configuration signal to the UE indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration.

[0211] The trigger manager 1125 may send a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration.

[0212] The SRS manager 1130 may receive a reference signal according to the first reference signal resource subset or the second reference signal resource subset based on the trigger signal.

[0213] The transmitter 1135 can transmit signals generated by other components of the device 1105. In some examples, the transmitter 1135 can be co-located with the receiver 1110 in a transceiver module. For example, the transmitter 1135 can be a reference Figure 13 Examples of various aspects of the transceiver 1320 are described. The transmitter 1135 may utilize a single antenna or a group of antennas.

[0214] Figure 12A block diagram 1200 is shown of a communication manager 1205 supporting flexible SRS switching capabilities in accordance with aspects of the present disclosure. The communication manager 1205 can be an example of aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 can include a configuration manager 1210, a trigger manager 1215, an SRS manager 1220, a multiple SRS resource set configuration manager 1225, a single SRS resource set configuration manager 1230, a group identity trigger manager 1235, a trigger state trigger manager 1240, and a UE capability manager 1245. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0215] The configuration manager 1210 may send a configuration signal to the UE indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration.

[0216] The trigger manager 1215 may send a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. In some cases, the trigger signal includes a DCI or a MAC CE.

[0217] SRS manager 1220 may receive a reference signal based on the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. In some examples, SRS manager 1220 may receive the first one or more reference signals using a first antenna configuration. In some examples, SRS manager 1220 may receive the second one or more reference signals using a second antenna configuration that is different from the first antenna configuration.

[0218] The multi-SRS resource set configuration manager 1225 may send a configuration signal indicating a group of reference signal resource sets, the group of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including a first reference signal resource subset associated with a first reference signal switching configuration, and the second reference signal resource set including a second reference signal resource subset associated with a second reference signal switching configuration. In some examples, the multi-SRS resource set configuration manager 1225 may send a configuration signal indicating a first group identifier associated with the first reference signal resource set and a second group identifier associated with the second reference signal resource set.

[0219] In some examples, the multi-SRS resource set configuration manager 1225 can send a configuration signal indicating a first period for the first reference signal resource set and a second period for the second reference signal resource set. In some examples, the multi-SRS resource set configuration manager 1225 can send a trigger signal activating a first reference signal switching configuration based on the first period for the first reference signal resource set and activating a second reference signal switching configuration based on the second period for the second reference signal resource set.

[0220] In some examples, the multi-SRS resource set configuration manager 1225 can send a trigger signal that activates a first reference signal switching configuration based on a first period for a first reference signal resource set, and when the first period expires, the trigger signal activates a second reference signal switching configuration based on a second period for a second reference signal resource set.

[0221] The single SRS resource set configuration manager 1230 may send a configuration signal indicating a single reference signal resource set, the single reference signal resource set including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. In some examples, the single SRS resource set configuration manager 1230 may send a configuration signal indicating a first group identifier associated with the first reference signal resource subset and a second group identifier associated with the second reference signal resource subset, wherein the trigger signal activates the first reference signal resource subset or the second reference signal resource subset.

[0222] In some examples, the single SRS resource set configuration manager 1230 may send a configuration signal indicating a first period for the first reference signal resource subset and a second period for the second reference signal resource subset. In some examples, the single SRS resource set configuration manager 1230 may send a trigger signal activating a first reference signal switching configuration based on the first period for the first reference signal resource subset and activating a second reference signal switching configuration based on the second period for the second reference signal resource subset.

[0223] In some examples, the single SRS resource set configuration manager 1230 can send a trigger signal that activates a first reference signal switching configuration according to a first periodicity for a first subset of reference signal resources, and upon expiration of the first periodicity, activates a second reference signal switching configuration according to a second periodicity for a second subset of reference signal resources. In some examples, the single SRS resource set configuration manager 1230 can send a configuration signal that indicates a first slot-level periodicity associated with the first subset of reference signal resources and a second slot-level periodicity associated with the second subset of reference signal resources, the second slot-level periodicity being different from the first slot-level periodicity.

[0224] The group identifier trigger manager 1235 can send a trigger signal including a group identifier, where the group identifier indicates one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

[0225] The trigger state trigger manager 1240 can send a trigger signal including a trigger state indication, which is used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is a periodic reference signal sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger state indication.

[0226] The UE capability manager 1245 may receive a UE capability message indicating support for multiple reference signal switching configurations for the BWP, wherein the configuration signal is sent based on the UE capability message.

[0227] In some examples, the UE capability manager 1245 may receive a UE capability message indicating the antenna switching capability of the UE, wherein the configuration signal is sent based on the antenna switching capability.

[0228] In some examples, the UE capability manager 1245 may receive a UE capability message indicating support for multiple active reference signal switching configurations for a BWP, the multiple active reference signal switching configurations including active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is based at least in part on the UE capability message.

[0229] Figure 13A diagram of a system 1300 including a device 1305 supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. The device 1305 can be an example of, or include components of, the device 1005, device 1105, or base station 105 as described herein. The device 1305 can include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components can communicate electronically via one or more buses (e.g., bus 1350).

[0230] The communication manager 1310 can perform the following operations: sending a configuration signal indicating one or more reference signal resource sets to the UE, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; sending a trigger signal, the trigger signal at least activates the first reference signal switching configuration or the second reference signal switching configuration; and based on the trigger signal, receiving a reference signal according to the first reference signal resource subset or the second reference signal resource subset.

[0231] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the transmission of data communications for client devices (eg, one or more UEs 115).

[0232] The transceiver 1320 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1320 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1320 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and demodulating packets received from the antenna.

[0233] In some cases, a wireless device may include a single antenna 1325. However, in some cases, the device may have more than one antenna 1325 that are capable of sending or receiving multiple wireless transmissions simultaneously.

[0234] Memory 1330 may include RAM, ROM, or a combination thereof. Memory 1330 may store computer-readable code 1335, which includes instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform various functions described herein. In some cases, memory 1330 may also contain, among other things, a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0235] The processor 1340 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 cases, the processor 1340 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into the processor 1340. The processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause the device 1305 to perform various functions (e.g., functions or tasks that support support for flexible SRS switching capabilities).

[0236] The inter-site communication manager 1345 can manage communications with other base stations 105 and can include a controller or scheduler for controlling communications with the UE 115 in cooperation with the other base stations 105. For example, the inter-site communication manager 1345 can coordinate the scheduling of transmissions to the UE 115 to implement various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 can provide an X2 interface within the LTE / LTE-A wireless communication network technology to provide communications between the base stations 105.

[0237] The code 1335 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium (e.g., system memory or other types of memory). In some cases, the code 1335 may not be directly executable by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0238] Figure 14 1400 according to various aspects of the present disclosure. The operations of the method 1400 may be implemented by the UE 115 or its components as described herein. For example, the operations of the method 1400 may be implemented by the UE 115 or its components as described herein. Figures 6 to 9In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0239] At 1405, the UE may receive a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described with reference to Figures 6 to 9 Describes the configuration manager to perform.

[0240] At 1410, the UE may receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 6 to 9 Describes the trigger manager to execute.

[0241] At 1415, the UE may transmit a reference signal based on the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described with reference to Figures 6 to 9 Described SRS manager to perform.

[0242] Figure 15 1. A flow chart illustrating a method 1500 for supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by the UE 115 or components thereof as described herein. Figures 6 to 9 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0243] At 1505, the UE may receive a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. 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 6 to 9 Describes the configuration manager to perform.

[0244] At 1510, the UE may receive a configuration signal indicating a set of reference signal resource sets, the set of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including a first reference signal resource subset associated with a first reference signal switching configuration, and the second reference signal resource set including a second reference signal resource subset associated with a second reference signal switching configuration. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 6 to 9 Describes the multi-SRS resource set configuration manager to perform.

[0245] At 1515, the UE may receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be as described with reference to Figures 6 to 9 Describes the trigger manager to execute.

[0246] At 1520, the UE may transmit a reference signal based on the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed as described with reference to Figures 6 to 9 Described SRS manager to perform.

[0247] Figure 16 16. A flow chart illustrating a method 1600 for supporting flexible SRS switching capabilities according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by the UE 115 or components thereof as described herein. Figures 6 to 9 In some examples, the UE may execute an instruction set to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0248] At 1605, the UE may receive a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. 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 6 to 9 Describes the configuration manager to perform.

[0249] At 1610, the UE may receive a configuration signal indicating a single reference signal resource set, the single reference signal resource set including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 6 to 9 Describes the implementation of a single SRS resource set configuration manager.

[0250] At 1615, the UE may receive a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be as described with reference to Figures 6 to 9 Describes the trigger manager to execute.

[0251] At 1620, the UE may transmit a reference signal based on the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed as described with reference to Figures 6 to 9 Described SRS manager to perform.

[0252] Figure 17 1700 according to various aspects of the present disclosure. 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 10 to 13 In some examples, the base station may execute an instruction set to control the functional units of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0253] At 1705, the base station may send a configuration signal to the UE indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. 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 10 to 13 Describes the configuration manager to perform.

[0254] At 1710, the base station may send a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 10 to 13 Describes the trigger manager to execute.

[0255] At 1715, the base station may receive a reference signal based on the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed as described with reference to Figures 10 to 13 Described SRS manager to perform.

[0256] Figure 18 1800 for supporting flexible SRS switching capabilities according to aspects of the present disclosure. The operations of the method 1800 may be implemented by the base station 105 or its components as described herein. For example, the operations of the method 1800 may be implemented by the base station 105 or its components as described herein. Figures 10 to 13 In some examples, the base station may execute an instruction set to control the functional units of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0257] At 1805, the base station may send a configuration signal to the UE indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration. 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 10 to 13 Describes the configuration manager to perform.

[0258] At 1810, the base station may send a trigger signal that activates at least the first reference signal switching configuration or the second reference signal switching configuration. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 10 to 13 Describes the trigger manager to execute.

[0259] At 1815, the base station may transmit a trigger signal including a group identifier, the group identifier indicating one of a first reference signal switching configuration or a second reference signal switching configuration, wherein the reference signal is transmitted according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed as described with reference to Figures 10 to 13 The group identifier described triggers the manager to execute.

[0260] At 1820, the base station may receive a reference signal based on the first reference signal resource subset or the second reference signal resource subset based on the trigger signal. 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 10 to 13 Described SRS manager to perform.

[0261] The following provides a summary of various aspects of the disclosure:

[0262] Aspect 1: A method for wireless communication at a UE, comprising: receiving a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; receiving a trigger signal, the trigger signal activating at least the first reference signal switching configuration or the second reference signal switching configuration; and sending a reference signal according to the first reference signal resource subset or the second reference signal resource subset based at least in part on the trigger signal.

[0263] Aspect 2: A method according to aspect 1, wherein receiving the configuration signal includes: receiving the configuration signal indicating multiple reference signal resource sets, the multiple reference signal resource sets include at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set includes the first reference signal resource subset associated with the first reference signal switching configuration, and the second reference signal resource set includes the second reference signal resource subset associated with the second reference signal switching configuration.

[0264] Aspect 3: The method according to aspect 2, wherein receiving the configuration signal includes: receiving the configuration signal, the configuration signal indicating a first group identifier associated with the first reference signal resource set and a second group identifier associated with the second reference signal resource set.

[0265] Aspect 4: The method according to any one of Aspects 2 to 3, wherein receiving the configuration signal includes: receiving the configuration signal, the configuration signal indicating a first period for the first reference signal resource set and a second period for the second reference signal resource set.

[0266] Aspect 5: A method according to Aspect 4, wherein receiving the trigger signal includes: receiving the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set and activating the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0267] Aspect 6: A method according to any one of Aspects 4 to 5, wherein receiving the trigger signal includes: receiving the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set, and when the first period expires, the trigger signal activating the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0268] Aspect 7: A method according to any one of Aspects 1 to 6, wherein receiving the configuration signal includes: receiving the configuration signal indicating a single reference signal resource set, the single reference signal resource set including at least the first reference signal resource subset associated with the first reference signal switching configuration and the second reference signal resource subset associated with the second reference signal switching configuration.

[0269] Aspect 8: A method according to Aspect 7, wherein receiving the configuration signal includes: receiving the configuration signal, the configuration signal indicating a first group identifier associated with the first reference signal resource subset and a second group identifier associated with the second reference signal resource subset, wherein the trigger signal activates the first reference signal resource subset or the second reference signal resource subset.

[0270] Aspect 9: The method according to any one of Aspects 7 to 8, wherein receiving the configuration signal includes: receiving the configuration signal, the configuration signal indicating a first period for the first reference signal resource subset and a second period for the second reference signal resource subset.

[0271] Aspect 10: A method according to Aspect 9, wherein receiving the trigger signal includes: receiving the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource subset and activating the second reference signal switching configuration according to the second period for the second reference signal resource subset.

[0272] Aspect 11: A method according to any one of Aspects 9 to 10, wherein receiving the trigger signal includes: receiving the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource subset, and when the first period expires, the trigger signal activating the second reference signal switching configuration according to the second period for the second reference signal resource subset.

[0273] Aspect 12: A method according to any one of Aspects 7 to 11, wherein receiving the configuration signal includes: receiving the configuration signal, the configuration signal indicating a first time slot level period associated with the first reference signal resource subset and a second time slot level period associated with the second reference signal resource subset, the second time slot level period being different from the first time slot level period.

[0274] Aspect 13: A method according to any one of Aspects 1 to 12, wherein receiving the trigger signal includes: receiving the trigger signal including a group identifier, the group identifier indicating one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

[0275] Aspect 14: A method according to any one of Aspects 1 to 13, wherein receiving the trigger signal includes: receiving the trigger signal including a trigger status indication, the trigger status indication being used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is a periodic reference signal, and the periodic reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger status indication.

[0276] Aspect 15: The method according to any one of aspects 1 to 14, wherein the trigger signal includes a DCI or a medium access control (MAC) control element (CE).

[0277] Aspect 16: The method according to any one of Aspects 1 to 15 further includes: sending a UE capability message indicating support for multiple reference signal switching configurations for a bandwidth part (BWP), wherein the configuration signal is at least partially based on the UE capability message.

[0278] Aspect 17: The method according to any one of aspects 1 to 16 further includes: sending a UE capability message indicating the antenna switching capability of the UE, wherein the configuration signal is based at least in part on the antenna switching capability.

[0279] Aspect 18: The method according to any one of Aspects 1 to 17 further includes: sending a UE capability message indicating support for multiple active reference signal switching configurations for a bandwidth part (BWP), wherein the multiple active reference signal switching configurations include active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is at least partially based on the UE capability message.

[0280] Aspect 19: The method according to any one of Aspects 1 to 18, wherein sending the reference signal comprises: sending a first one or more reference signals using a first antenna configuration; and sending a second one or more reference signals using a second antenna configuration different from the first antenna configuration.

[0281] Aspect 20: A method for wireless communication at a base station, comprising: sending a configuration signal indicating one or more reference signal resource sets to a UE, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration; sending a trigger signal, the trigger signal activating at least the first reference signal switching configuration or the second reference signal switching configuration; and receiving a reference signal according to the first reference signal resource subset or the second reference signal resource subset based at least in part on the trigger signal.

[0282] Aspect 21: A method according to Aspect 20, wherein sending the configuration signal includes: sending the configuration signal indicating multiple reference signal resource sets, the multiple reference signal resource sets include at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set includes the first reference signal resource subset associated with the first reference signal switching configuration, and the second reference signal resource set includes the second reference signal resource subset associated with the second reference signal switching configuration.

[0283] Aspect 22: The method according to aspect 21, wherein sending the configuration signal includes: sending the configuration signal, the configuration signal indicating a first group identifier associated with the first reference signal resource set and a second group identifier associated with the second reference signal resource set.

[0284] Aspect 23: The method according to any one of Aspects 21 to 22, wherein sending the configuration signal includes: sending the configuration signal, the configuration signal indicating a first period for the first reference signal resource set and a second period for the second reference signal resource set.

[0285] Aspect 24: A method according to Aspect 23, wherein sending the trigger signal includes: sending the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set and activating the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0286] Aspect 25: A method according to any one of Aspects 23 to 24, wherein sending the trigger signal includes: sending the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource set, and when the first period expires, the trigger signal activates the second reference signal switching configuration according to the second period for the second reference signal resource set.

[0287] Aspect 26: A method according to any one of Aspects 20 to 25, wherein sending the configuration signal includes: sending the configuration signal indicating a single reference signal resource set, the single reference signal resource set including at least the first reference signal resource subset associated with the first reference signal switching configuration and the second reference signal resource subset associated with the second reference signal switching configuration.

[0288] Aspect 27: A method according to Aspect 26, wherein sending the configuration signal includes: sending the configuration signal, the configuration signal indicating a first group identifier associated with the first reference signal resource subset and a second group identifier associated with the second reference signal resource subset, wherein the trigger signal activates the first reference signal resource subset or the second reference signal resource subset.

[0289] Aspect 28: The method according to any one of Aspects 26 to 27, wherein sending the configuration signal comprises sending the configuration signal, the configuration signal indicating a first period for the first reference signal resource subset and a second period for the second reference signal resource subset.

[0290] Aspect 29: A method according to Aspect 28, wherein sending the trigger signal includes: sending the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource subset and activating the second reference signal switching configuration according to the second period for the second reference signal resource subset.

[0291] Aspect 30: A method according to any one of Aspects 28 to 29, wherein sending the trigger signal includes: sending the trigger signal, the trigger signal activating the first reference signal switching configuration according to the first period for the first reference signal resource subset, and when the first period expires, the trigger signal activates the second reference signal switching configuration according to the second period for the second reference signal resource subset.

[0292] Aspect 31: A method according to any one of Aspects 28 to 30, wherein sending the configuration signal includes: sending the configuration signal, the configuration signal indicating a first time slot level period associated with the first reference signal resource subset and a second time slot level period associated with the second reference signal resource subset, the second time slot level period being different from the first time slot level period.

[0293] Aspect 32: A method according to any one of Aspects 20 to 31, wherein sending the trigger signal includes: sending the trigger signal including a group identifier, the group identifier indicating one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

[0294] Aspect 33: A method according to any one of Aspects 20 to 32, wherein sending the trigger signal includes: sending the trigger signal including a trigger status indication, the trigger status indication being used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is a periodic reference signal, and the periodic reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger status indication.

[0295] Aspect 34: The method according to any one of aspects 20 to 33, wherein the trigger signal includes a DCI or a medium access control (MAC) control element (CE).

[0296] Aspect 35: The method according to any one of Aspects 20 to 34 further includes: receiving a UE capability message indicating support for multiple reference signal switching configurations for a bandwidth part (BWP), wherein the configuration signal is sent at least in part based on the UE capability message.

[0297] Aspect 36: The method according to any one of aspects 20 to 35 further includes: receiving a UE capability message indicating antenna switching capability of the UE, wherein the configuration signal is sent at least in part based on the antenna switching capability.

[0298] Aspect 37: The method according to any one of Aspects 20 to 36 further includes: receiving a UE capability message indicating support for multiple active reference signal switching configurations for a bandwidth part (BWP), wherein the multiple active reference signal switching configurations include active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is at least partially based on the UE capability message.

[0299] Aspect 38: The method of any one of Aspects 20 to 37, wherein receiving the reference signal comprises: receiving a first one or more reference signals using a first antenna configuration; and receiving a second one or more reference signals using a second antenna configuration different from the first antenna configuration.

[0300] Aspect 39: An apparatus for wireless communication at a UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of aspects 1 to 19.

[0301] Aspect 40: An apparatus for wireless communication at a UE, comprising at least one means for performing the method according to any one of aspects 1 to 19.

[0302] Aspect 41: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 19.

[0303] Aspect 42: An apparatus for wireless communication at a base station, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of aspects 20 to 38.

[0304] Aspect 43: An apparatus for wireless communication at a base station, comprising at least one means for performing the method according to any one of aspects 20 to 38.

[0305] Aspect 44: A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to perform the method of any one of aspects 20 to 38.

[0306] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0307] 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 throughout 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.

[0308] 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 may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0309] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the 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 one or more microprocessors and a DSP core, or any other such configuration).

[0310] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Features that implement the functions may also be physically located at various locations, including being distributed so that portions of the functions are implemented at different physical locations.

[0311] Computer readable medium includes non-transitory computer storage medium and communication medium, and communication medium includes any medium that promotes the transmission of computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general-purpose computer or special-purpose computer.By way of example and not limitation, non-transitory computer readable medium 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 for carrying or storing desired program code unit and any other non-transitory medium that can be accessed by general-purpose or special-purpose computer or general or special-purpose processor in the form of instruction or data structure.In addition, any connection is suitably referred to as computer readable medium.For example, if software is to be sent from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0312] As used herein (including in the claims), "or" as used in a list of items (e.g., a list of items 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). Furthermore, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based at least in part on" should be interpreted in the same manner as the phrase "based on."

[0313] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number to distinguish between similar components. If only the first reference number is used in the specification, the description applies to any one of the similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0314] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that can be implemented or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "having advantages over other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0315] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to those skilled in the art, and the overall principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is intended to be used in the broadest sense consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: Receiving a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration, wherein receiving the configuration signal comprises: receiving the configuration signal indicating a plurality of reference signal resource sets, the plurality of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including the first reference signal resource subset associated with the first reference signal switching configuration, the second reference signal resource set including the second reference signal resource subset associated with the second reference signal switching configuration, wherein the configuration signal indicates a first period for the first reference signal resource set and a second period for the second reference signal resource set; receiving a trigger signal that activates the first reference signal switching configuration according to at least the first periodicity for the first reference signal resource set, and upon expiration of the first periodicity, activates the second reference signal switching configuration according to the second periodicity for the second reference signal resource set; and Based at least in part on the triggering signal, a reference signal is sent according to the first subset of reference signal resources or the second subset of reference signal resources.

2. The method according to claim 1, wherein Receiving the configuration signal includes: The configuration signal is received, the configuration signal indicating a first group identifier associated with the first set of reference signal resources and a second group identifier associated with the second set of reference signal resources.

3. The method according to claim 1, wherein Receiving the trigger signal includes: The trigger signal is received, the trigger signal activating the first reference signal switching configuration according to the first periodicity for the first reference signal resource set and activating the second reference signal switching configuration according to the second periodicity for the second reference signal resource set.

4. The method according to claim 1, wherein Receiving the configuration signal includes: The configuration signal is received indicating a single set of reference signal resources, the single set of reference signal resources including at least the first subset of reference signal resources associated with the first reference signal switching configuration and the second subset of reference signal resources associated with the second reference signal switching configuration.

5. The method according to claim 4, wherein Receiving the configuration signal includes: The configuration signal is received, the configuration signal indicating a first group identifier associated with the first subset of reference signal resources and a second group identifier associated with the second subset of reference signal resources, wherein the trigger signal activates the first subset of reference signal resources or the second subset of reference signal resources.

6. The method according to claim 4, wherein: Receiving the configuration signal includes: The configuration signal is received, the configuration signal indicating a first periodicity for the first subset of reference signal resources and a second periodicity for the second subset of reference signal resources.

7. The method according to claim 6, wherein: Receiving the trigger signal includes: The trigger signal is received, the trigger signal activating the first reference signal switching configuration according to the first periodicity for the first subset of reference signal resources and activating the second reference signal switching configuration according to the second periodicity for the second subset of reference signal resources.

8. The method according to claim 6, wherein: Receiving the trigger signal includes: The trigger signal is received, the trigger signal activating the first reference signal switching configuration according to the first period for the first subset of reference signal resources, and upon expiration of the first period, the trigger signal activating the second reference signal switching configuration according to the second period for the second subset of reference signal resources.

9. The method according to claim 4, wherein: Receiving the configuration signal includes: The configuration signal is received, the configuration signal indicating a first slot-level periodicity associated with the first subset of reference signal resources and a second slot-level periodicity associated with the second subset of reference signal resources, the second slot-level periodicity being different from the first slot-level periodicity.

10. The method according to claim 1, wherein Receiving the trigger signal includes: Receive the trigger signal including a group identifier, the group identifier indicating one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

11. The method according to claim 1, wherein Receiving the trigger signal includes: Receive the trigger signal including a trigger status indication, where the trigger status indication is used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is a periodic reference signal sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger status indication.

12. The method according to claim 1, wherein The trigger signal includes downlink control information (DCI) or a medium access control (MAC) control element (CE).

13. The method according to claim 1, further comprising: A UE capability message is sent indicating support for multiple reference signal switching configurations for a bandwidth part (BWP), wherein the configuration signal is based at least in part on the UE capability message.

14. The method according to claim 1, further comprising: A UE capability message is sent indicating antenna switching capabilities of the UE, wherein the configuration signal is based at least in part on the antenna switching capabilities.

15. The method according to claim 1, further comprising: and transmitting a UE capability message indicating support for multiple active reference signal switching configurations for a bandwidth part (BWP), the multiple active reference signal switching configurations including active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is based at least in part on the UE capability message.

16. The method according to claim 1, wherein Sending the reference signal includes: transmitting a first one or more reference signals using a first antenna configuration; and Second one or more reference signals are sent using a second antenna configuration different from the first antenna configuration.

17. A method for wireless communication at a network device, comprising: Sending a configuration signal indicating one or more reference signal resource sets to a user equipment (UE), the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration, wherein sending the configuration signal comprises: sending the configuration signal indicating a plurality of reference signal resource sets, the plurality of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including the first reference signal resource subset associated with the first reference signal switching configuration, the second reference signal resource set including the second reference signal resource subset associated with the second reference signal switching configuration, wherein the configuration signal indicates a first period for the first reference signal resource set and a second period for the second reference signal resource set; sending a trigger signal that activates the first reference signal switching configuration according to at least the first periodicity for the first reference signal resource set, and upon expiration of the first periodicity, activates the second reference signal switching configuration according to the second periodicity for the second reference signal resource set; and A reference signal is received according to the first subset of reference signal resources or the second subset of reference signal resources based at least in part on the triggering signal.

18. An apparatus for wireless communication at a user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions, which are stored in the memory and executable by the processor to cause the device to perform the following operations: receiving a configuration signal indicating one or more reference signal resource sets, the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration, wherein the instructions for receiving the configuration signal are executable by the processor to cause the apparatus to perform the following operations: receiving the configuration signal indicating a plurality of reference signal resource sets, the plurality of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including the first reference signal resource subset associated with the first reference signal switching configuration, the second reference signal resource set including the second reference signal resource subset associated with the second reference signal switching configuration, wherein the configuration signal indicates a first period for the first reference signal resource set and a second period for the second reference signal resource set; receiving a trigger signal that activates the first reference signal switching configuration according to at least the first periodicity for the first reference signal resource set, and upon expiration of the first periodicity, activates the second reference signal switching configuration according to the second periodicity for the second reference signal resource set; and Based at least in part on the triggering signal, a reference signal is sent according to the first subset of reference signal resources or the second subset of reference signal resources.

19. The device according to claim 18, wherein The instructions for receiving the configuration signal may be executed by the processor to cause the apparatus to: The configuration signal is received, the configuration signal indicating a first group identifier associated with the first set of reference signal resources and a second group identifier associated with the second set of reference signal resources.

20. The apparatus according to claim 18, wherein The instructions for receiving the trigger signal may be executed by the processor to cause the apparatus to perform the following operations: The trigger signal is received, the trigger signal activating the first reference signal switching configuration according to the first periodicity for the first reference signal resource set and activating the second reference signal switching configuration according to the second periodicity for the second reference signal resource set.

21. The apparatus according to claim 18, wherein The instructions for receiving the configuration signal may be executed by the processor to cause the apparatus to: The configuration signal is received indicating a single set of reference signal resources, the single set of reference signal resources including at least the first subset of reference signal resources associated with the first reference signal switching configuration and the second subset of reference signal resources associated with the second reference signal switching configuration.

22. The device according to claim 21, wherein The instructions for receiving the configuration signal may be executed by the processor to cause the apparatus to: The configuration signal is received, the configuration signal indicating a first group identifier associated with the first subset of reference signal resources and a second group identifier associated with the second subset of reference signal resources, wherein the trigger signal activates the first subset of reference signal resources or the second subset of reference signal resources.

23. The device according to claim 21, wherein The instructions for receiving the configuration signal may be executed by the processor to cause the apparatus to: The configuration signal is received, the configuration signal indicating a first periodicity for the first subset of reference signal resources and a second periodicity for the second subset of reference signal resources.

24. The device according to claim 23, wherein The instructions for receiving the trigger signal may be executed by the processor to cause the apparatus to perform the following operations: The trigger signal is received, the trigger signal activating the first reference signal switching configuration according to the first periodicity for the first subset of reference signal resources and activating the second reference signal switching configuration according to the second periodicity for the second subset of reference signal resources.

25. The apparatus according to claim 23, wherein The instructions for receiving the trigger signal may be executed by the processor to cause the apparatus to perform the following operations: The trigger signal is received, the trigger signal activating the first reference signal switching configuration according to the first period for the first subset of reference signal resources, and upon expiration of the first period, the trigger signal activating the second reference signal switching configuration according to the second period for the second subset of reference signal resources.

26. The apparatus according to claim 21, wherein The instructions for receiving the configuration signal may be executed by the processor to cause the apparatus to: The configuration signal is received, the configuration signal indicating a first slot-level periodicity associated with the first subset of reference signal resources and a second slot-level periodicity associated with the second subset of reference signal resources, the second slot-level periodicity being different from the first slot-level periodicity.

27. The apparatus according to claim 18, wherein The instructions for receiving the trigger signal may be executed by the processor to cause the apparatus to perform the following operations: Receive the trigger signal including a group identifier, the group identifier indicating one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the group identifier.

28. The apparatus according to claim 18, wherein The instructions for receiving the trigger signal may be executed by the processor to cause the apparatus to perform the following operations: Receive the trigger signal including a trigger status indication, where the trigger status indication is used to indicate one of the first reference signal switching configuration or the second reference signal switching configuration, wherein the reference signal is a periodic reference signal sent according to the first reference signal switching configuration or the second reference signal switching configuration corresponding to the trigger status indication.

29. The apparatus according to claim 18, wherein The trigger signal includes downlink control information (DCI) or a medium access control (MAC) control element (CE).

30. The apparatus of claim 18, wherein The instructions may also be executed by the processor to cause the device to perform the following operations: A UE capability message is sent indicating support for multiple reference signal switching configurations for a bandwidth part (BWP), wherein the configuration signal is based at least in part on the UE capability message.

31. The apparatus according to claim 18, wherein The instructions may also be executed by the processor to cause the device to perform the following operations: A UE capability message is sent indicating antenna switching capabilities of the UE, wherein the configuration signal is based at least in part on the antenna switching capabilities.

32. The apparatus of claim 18, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: and transmitting a UE capability message indicating support for multiple active reference signal switching configurations for a bandwidth part (BWP), the multiple active reference signal switching configurations including active reference signal switching configurations associated with different timing configurations, wherein the configuration signal is based at least in part on the UE capability message.

33. The apparatus according to claim 18, wherein The instructions for sending the reference signal may be executed by the processor to cause the apparatus to perform the following operations: transmitting a first one or more reference signals using a first antenna configuration; and Second one or more reference signals are sent using a second antenna configuration different from the first antenna configuration.

34. An apparatus for wireless communication at a network device, comprising: processor, a memory coupled to the processor; as well as Instructions, which are stored in the memory and executable by the processor to cause the device to perform the following operations: sending a configuration signal indicating one or more reference signal resource sets to a user equipment (UE), the one or more reference signal resource sets including at least a first reference signal resource subset associated with a first reference signal switching configuration and a second reference signal resource subset associated with a second reference signal switching configuration, wherein the instructions for sending the configuration signal are executable by the processor to cause the apparatus to perform the following operations: sending the configuration signal indicating a plurality of reference signal resource sets, the plurality of reference signal resource sets including at least a first reference signal resource set and a second reference signal resource set, the first reference signal resource set including the first reference signal resource subset associated with the first reference signal switching configuration, the second reference signal resource set including the second reference signal resource subset associated with the second reference signal switching configuration, wherein the configuration signal indicates a first period for the first reference signal resource set and a second period for the second reference signal resource set; sending a trigger signal that activates the first reference signal switching configuration according to at least the first periodicity for the first reference signal resource set, and upon expiration of the first periodicity, activates the second reference signal switching configuration according to the second periodicity for the second reference signal resource set; and A reference signal is received according to the first subset of reference signal resources or the second subset of reference signal resources based at least in part on the triggering signal.

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