Reference signal configuration for secondary cell activation

Abstract

Methods, systems, and apparatus for wireless communication are described, wherein a temporary reference signal can be configured for use in secondary cell (SCell) activation. A user equipment (UE) can perform wireless communication with a first serving cell supported by a base station and can receive an indication that an SCell will be activated. Due to SCell activation, the UE can perform one or more measurements on the reference signal of the activated SCell. One or more measurements can be performed on the temporary reference signal of the SCell, which has one or more parameters indicated to the UE using SCell activation information. The one or more parameters can be indicated by downlink control information (DCI), one or more media access control (MAC) control elements, implicit signaling, or any combination thereof.

Description

[0001] Cross-referencing

[0002] This patent application claims the rights of the following applications: U.S. Provisional Patent Application No. 63 / 094,996, filed October 22, 2020, entitled “REFERENCE SIGNAL CONFIGURATION FOR SECONDARY CELL ACTIVATION”, by Takeda et al.; and U.S. Patent Application No. 17 / 507,049, filed October 21, 2021, entitled “REFERENCE SIGNAL CONFIGURATION FOR SECONDARY CELL ACTIVATION”, by Takeda et al.; and each of the foregoing applications being assigned to the assignee of this application. Technical Field

[0003] The following text relates to wireless communications, including the configuration of reference signals for secondary cell activation. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. 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 can 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 Spectrum 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 with multiple communication devices (which may also be referred to as User Equipment (UE)).

[0005] In some wireless communication systems, a base station can communicate with a UE via one or more serving cells (such as a primary cell (PCell) and one or more secondary cells (SCell)). The base station can activate additional serving cells (e.g., SCells) at the UE to increase data throughput, alleviate network congestion, or both. Conversely, the network can also deactivate previously activated serving cells. Efficient techniques for activating serving cells can help improve the efficiency and reliability of wireless communication systems. Summary of the Invention

[0006] The described techniques relate to improved methods, systems, apparatuses, and devices for configuring reference signals for secondary cell activation. Various described techniques target the use of reference signals (e.g., temporary reference signals, which may be referred to herein as aperiodic reference signals) on the serving cell to reduce the duration for activating the serving cell at the user equipment (UE). In some aspects, the UE may perform wireless communication with a first serving cell (e.g., a primary cell (PCell)) supported by a base station and may receive an indication that a secondary cell (SCell) supported by the base station (or a different base station) will be activated. Upon activating the SCell, the UE may perform one or more measurements on the reference signal of the SCell being activated to perform automatic gain control (AGC), time tracking, frequency tracking, or any combination thereof for the SCell. To shorten the activation time for the SCell, a temporary reference signal may be transmitted on the SCell prior to one or more other reference signals transmitted by the SCell (e.g., reference signals transmitted using a synchronization signal block (SSB) that may have a relatively long period). By receiving a temporary reference signal, the activation time for the SCell can be reduced, thus allowing for relatively rapid data communication after the SCell is activated.

[0007] In some cases, the SCell activation message may indicate one or more parameters for the temporary reference signal, such as the carrier for the temporary reference signal, the time slot position of the temporary reference signal, the reference signal configuration, the beam configuration for the temporary signal, or any combination thereof. In some cases, downlink control information (DCI) communication from the base station to activate the SCell may provide one or more parameters for the temporary reference signal. In other cases, the Media Access Control (MAC) element (CE) may provide one or more parameters for the temporary reference signal. Alternatively or concurrently, one or more parameters for the temporary reference signal may be implicitly notified by the base station via signaling.

[0008] A method for wireless communication at a UE is described. The method may include: receiving from a base station a secondary cell activation message indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identifying one or more parameters of an aperiodic reference signal for cell activation measurement based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and measuring one or more characteristics of the secondary cell based on the aperiodic reference signal.

[0009] An apparatus for wireless communication at a UE is described. The apparatus may include: a processor, a memory coupled to the processor (e.g., operative ground, communicative ground, functional ground, electronic ground, and / or electrical ground), and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receive from a base station a secondary cell activation message indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identify one or more parameters of an aperiodic reference signal for cell activation measurement based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and measure one or more characteristics of the secondary cell based on the aperiodic reference signal.

[0010] Another apparatus for wireless communication at a UE is described. The apparatus may include units for performing the following operations: receiving from a base station a secondary cell activation message indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identifying one or more parameters of an aperiodic reference signal for cell activation measurement based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and measuring one or more characteristics of the secondary cell based on the aperiodic reference signal.

[0011] A non-transitory computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive from a base station a secondary cell activation message indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identify one or more parameters of an aperiodic reference signal for cell activation measurement based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and measure one or more characteristics of the secondary cell based on the aperiodic reference signal.

[0012] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the identification may include operations, features, units, or instructions for performing the following: receiving from the base station one or more of a DCI or MAC-CE including information associated with the aperiodic reference signal; and determining one or more parameters for the aperiodic reference signal based on the DCI, the MAC-CE, implicit signaling, or a combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal include one or more of the following: the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the mapping of resources of the aperiodic reference signal, the power offset of the aperiodic reference signal relative to downlink shared channel or SSB transmission, the quasi-co-position (QCL) assumption for the beam of the aperiodic reference signal, the transmission configuration indicator (TCI) state of the aperiodic reference signal, or any combination thereof.

[0013] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the aperiodic reference signal may be transmitted after a time gap associated with the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the time gap corresponds to a first predetermined time period after the UE's confirmation of the secondary cell activation message, a second predetermined time period after downlink control channel communication for providing the DCI, or a third predetermined time period after the UE's confirmation of the DCI.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving a DCI from the base station indicating one or more parameters for the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI schedules shared channel communication that provides the secondary cell activation message and indicates one or more parameters for the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in an information field in the DCI, and wherein the information field may have the same format as a Channel State Information (CSI) request field that can be transmitted in the DCI.

[0015] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI may be a separate DCI from the scheduling DCI, which schedules shared channel communications for providing the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the separate DCI includes additional scheduling information for downlink shared channel communications with the UE and the one or more parameters for the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the separate DCI may be included together with downlink control channel communications that do not provide scheduling information for shared channel communications. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in one or more fields in the separate DCI, which may otherwise be used for the scheduling information of the shared channel communications.

[0016] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in an information field having the same format as the CSI request field in an uplink grant. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the number of bits in the information field may be configured by Radio Resource Control (RRC) signaling or may be determined based on the number of available Tracking Reference Signal (TRS) states. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the information field may be mapped to one or more of the following for one or more serving cells: TRS timing or time slots, TRS resources, TRS power offset, or any combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in one or more of the following: Frequency Domain Resource Assignment (FDRA) field, Time Domain Resource Assignment (TDRA) field, or any combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI may have a back-down DCI format or a non-back-down DCI format.

[0017] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI instructs the UE not to measure the aperiodic reference signal, and wherein the measurement of the one or more characteristics of the secondary cell may be based on one or more channel measurements of the SSB associated with the secondary cell.

[0018] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the measurement of the aperiodic reference signal can be triggered by the DCI having a pre-configured DCI format. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the pre-configured DCI format can be configured by RRC signaling.

[0019] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the measurement of the aperiodic reference signal may be triggered by the DCI located in a pre-configured set of DCI search spaces. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, one or more pre-configured sets of DCI search spaces that may include the DCI for triggering the measurement of the aperiodic reference signal may be configured by RRC signaling.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving from the base station a MAC-CE for indicating one or more parameters for the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE providing the one or more parameters for the aperiodic reference signal also provides the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first MAC-CE provides one or more parameters for the aperiodic reference signal, and a second MAC-CE provides the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first MAC-CE and the second MAC-CE may be in the same downlink shared channel communication from the base station, or they may be in different downlink shared channel communications from the base station.

[0021] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE includes a first field and a second field, the first field indicating the secondary cell to be activated, and the second field indicating one or more parameters of the aperiodic reference signal for the secondary cell to be activated. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE includes a field carrying an indication of one or more parameters of the aperiodic reference signal for two or more secondary cells. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE includes a first field indicating a carrier of the aperiodic reference signal and a second field indicating one or more other parameters for the aperiodic reference signal.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving, after receiving the MAC-CE, DCI transmissions from the base station for disabling the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the aperiodic reference signal is enabled if shared-channel communication carrying the MAC-CE is scheduled by a pre-configured DCI format. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the pre-configured DCI format may be configured by RRC signaling. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the aperiodic reference signal is enabled if shared-channel communication carrying the MAC-CE is scheduled by DCI transmissions in a DCI search space set configured via RRC signaling.

[0023] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be implicitly indicated by a MAC-CE used to carry the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be pre-configured at the UE by higher-layer signaling.

[0024] A method for wireless communication at a base station is described. The method may include: sending a secondary cell activation message to a UE indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identifying one or more parameters for an aperiodic reference signal for the secondary cell based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and transmitting the aperiodic reference signal to the UE based on the identification.

[0025] An apparatus for wireless communication at a base station is described. The apparatus may include: a processor, a memory coupled to the processor (e.g., operative ground, communicative ground, functional ground, electronic ground, and / or electrical ground), and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: send a secondary cell activation message to a UE indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identify one or more parameters of an aperiodic reference signal for the secondary cell based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and send the aperiodic reference signal to the UE based on the identification.

[0026] Another apparatus for wireless communication at a base station is described. The apparatus may include units for performing the following operations: sending a secondary cell activation message to a UE indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identifying one or more parameters for an aperiodic reference signal for the secondary cell based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and transmitting the aperiodic reference signal to the UE based on the identification.

[0027] A non-transitory computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to: send a secondary cell activation message to a UE, indicating that a secondary cell will also be activated at the UE in addition to a primary cell; identify one or more parameters for an aperiodic reference signal for the secondary cell based on the secondary cell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and send the aperiodic reference signal to the UE based on the identification.

[0028] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for transmitting to the UE one or more of a DCI or MAC-CE including information associated with the aperiodic reference signal, wherein the one or more parameters for the aperiodic reference signal may be indicated by the DCI, the MAC-CE, implicit signaling, or any combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal include one or more of the following: the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the mapping of resources of the aperiodic reference signal, the power offset of the aperiodic reference signal relative to downlink shared channel or SSB transmission, the QCL assumption for the beam of the aperiodic reference signal, the TCI state of the aperiodic reference signal, or any combination thereof.

[0029] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the aperiodic reference signal may be transmitted after a time gap associated with the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the time gap corresponds to a first predetermined time period after the UE's confirmation of the secondary cell activation message, a second predetermined time period after downlink control channel communication for providing the DCI, or a third predetermined time period after the UE's confirmation of the DCI.

[0030] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, elements, or instructions for sending a DCI to the UE to indicate one or more parameters for the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI schedules shared channel communication that provides the secondary cell activation message and indicates one or more parameters for the aperiodic reference signal.

[0031] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in an information field in the DCI, and wherein the information field may have the same format as a CSI request field that may be transmitted in the DCI. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI may be a separate DCI from a scheduling DCI that schedules shared channel communications for providing the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the separate DCI includes additional scheduling information for downlink shared channel communications with the UE and the one or more parameters for the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the separate DCI may be included together with downlink control channel communications that do not provide scheduling information for shared channel communications. In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in one or more fields in the respective DCI, which may otherwise be used for the scheduling information of the shared channel communication.

[0032] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in an information field having the same format as the CSI request field in an uplink grant. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the number of bits in the information field may be configured by RRC signaling or may be determined based on the number of available TRS states. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the information field may be mapped to one or more of the following for one or more serving cells: TRS timing or slots, TRS resources, TRS power offset, or any combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be provided in one or more of the following: an FDRA field, a TDRA field, or any combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI may have a back-off DCI format or a non-back-off DCI format.

[0033] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the DCI instructs the UE not to measure the aperiodic reference signal, and wherein the UE measures the one or more characteristics of the secondary cell based on one or more channel measurements of the SSB associated with the secondary cell.

[0034] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the measurement of the aperiodic reference signal is triggered by the DCI having a pre-configured DCI format. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the pre-configured DCI format may be configured by RRC signaling.

[0035] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the measurement of the aperiodic reference signal is triggered by the DCI located in a pre-configured set of DCI search spaces. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, one or more pre-configured sets of DCI search spaces that may include the DCI for triggering the measurement of the aperiodic reference signal may be configured by RRC signaling.

[0036] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for sending a MAC-CE to the UE to indicate one or more parameters for the aperiodic reference signal. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE providing the one or more parameters for the aperiodic reference signal also provides the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first MAC-CE provides one or more parameters for the aperiodic reference signal, and a second MAC-CE provides the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the first MAC-CE and the second MAC-CE may be in the same downlink shared channel communication from the base station, or they may be in different downlink shared channel communications from the base station.

[0037] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE includes a first field and a second field, the first field indicating the secondary cell to be activated, and the second field indicating one or more parameters of the aperiodic reference signal for the secondary cell to be activated. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE includes a field for carrying an indication of one or more parameters of the aperiodic reference signal for two or more secondary cells. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the MAC-CE includes a first field for indicating the carrier of the aperiodic reference signal and a second field for indicating one or more other parameters for the aperiodic reference signal.

[0038] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, elements, or instructions for transmitting DCI transmissions to the UE to disable the aperiodic reference signal after transmitting the MAC-CE. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the aperiodic reference signal is enabled if the shared channel communication carrying the MAC-CE is scheduled by a pre-configured DCI format. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the pre-configured DCI format may be configured by RRC signaling. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the aperiodic reference signal is enabled if the shared channel communication carrying the MAC-CE is scheduled by DCI transmissions in a DCI search space set configured via RRC signaling.

[0039] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be implicitly indicated by a MAC-CE used to carry the secondary cell activation message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the one or more parameters for the aperiodic reference signal may be pre-configured at the UE by higher-layer signaling. Attached Figure Description

[0040] Figure 1 Examples of systems for wireless communication supporting reference signal configuration for secondary cell activation are shown, according to various aspects of this disclosure.

[0041] Figure 2 An example of a portion of a wireless communication system that supports the configuration of reference signals for secondary cell activation according to various aspects of this disclosure is shown.

[0042] Figures 3 to 8 An example of a resource allocation scheme for reference signal configuration supporting secondary cell activation, based on various aspects of this disclosure, is shown.

[0043] Figure 9 An example of a reference signal activation field for reference signal configuration used for secondary cell activation, in accordance with various aspects of this disclosure, is shown.

[0044] Figure 10 An example of a process flow for configuring reference signals for secondary cell activation, based on various aspects of this disclosure, is shown.

[0045] Figure 11 and Figure 12A block diagram of an apparatus for configuring reference signals for secondary cell activation, according to various aspects of this disclosure, is shown.

[0046] Figure 13 A block diagram of a communication manager supporting reference signal configuration for secondary cell activation, according to various aspects of this disclosure, is shown.

[0047] Figure 14 A diagram of a system including devices supporting reference signal configuration for secondary cell activation, according to various aspects of this disclosure, is shown.

[0048] Figure 15 and Figure 16 A block diagram of an apparatus for configuring reference signals for secondary cell activation, according to various aspects of this disclosure, is shown.

[0049] Figure 17 A block diagram of a communication manager supporting reference signal configuration for secondary cell activation, according to various aspects of this disclosure, is shown.

[0050] Figure 18 A diagram of a system including devices supporting reference signal configuration for secondary cell activation, according to various aspects of this disclosure, is shown.

[0051] Figures 19 to 27 A flowchart illustrating a method for configuring reference signals to support secondary cell activation, based on various aspects of this disclosure, is shown. Detailed Implementation

[0052] In some wireless communication systems, a base station can communicate with a user equipment (UE) via one or more serving cells (e.g., a primary cell (PCell) and one or more secondary cells (SCells)). In addition to the PCell, the network can also activate one or more SCells at the UE to increase data throughput, alleviate network congestion, or both. However, in some cases, the SCell activation process may require a relatively long duration. For example, in some 5G NR systems, each cell may transmit relatively few reference signals, and in some cases, the UE may measure one or more reference signals to obtain measurements associated with the SCell (e.g., automatic gain control (AGC) measurements, time tracking measurements, and / or frequency tracking measurements) before SCell activation. In some cases, this UE measurement for SCell activation can be performed using periodic synchronization signal blocks (SSBs) transmissions of the SCell, which can occur at relatively long intervals. To reduce the time required for SCell activation, in some cases, the SCell may transmit temporary reference signals to allow the UE to measure and activate the SCell more quickly. Such temporary reference signals can be examples of aperiodic reference signals.

[0053] According to some aspects of this disclosure, the SCell activation message may indicate one or more parameters for the temporary reference signal, such as the carrier for the temporary reference signal, the time slot position of the temporary reference signal, the reference signal configuration, the beam configuration for the temporary signal, or any combination thereof. In some cases, downlink control information (DCI) communication from the base station for activating the SCell may provide one or more parameters for the temporary reference signal. In other cases, a media access control (MAC) control element (CE) may provide one or more parameters for the temporary reference signal. Alternatively or additionally, one or more parameters for the temporary reference signal may be implicitly notified by the base station via signaling.

[0054] By reducing the time of interruption on active serving cells due to activation / deactivation of additional serving cells, the techniques described herein enable more reliable and efficient wireless communication and improve the overall user experience.

[0055] Specific implementations of the subject matter described in this disclosure can be implemented to achieve one or more of the following potential advantages. In some implementations, the described techniques can provide improved wireless communication by reducing the duration of the activation time for the SCell. Specifically, by receiving a reference signal (e.g., a temporary reference signal) based on reference signal parameters associated with the activation command, the UE can activate the SCell with a reduced activation time relative to other periodically transmitted reference signals (e.g., in an SSB). By reducing the activation duration of the SCell at the UE, the techniques described herein can improve the efficiency and reliability of wireless communication, providing higher throughput, greater system capacity, and lower latency, among other benefits.

[0056] Various aspects of this disclosure are first described in the context of a wireless communication system. Additional aspects of this disclosure are described in the context of exemplary resource allocation schemes, reference signal activation fields, and example process flows. Various aspects of this disclosure are further illustrated by apparatus diagrams, system diagrams, and flowcharts relating to the configuration of reference signals for secondary cell activation, and are described with reference to these diagrams.

[0057] Figure 1Examples of a wireless communication system 100 supporting reference signal configurations for secondary cell activation according to various aspects of this disclosure are 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 improved LTE (LTE-A) network, an LTE-APro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, or communication with low-cost and low-complexity devices, or any combination thereof.

[0058] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, on which UE 115 and base station 105 can establish one or more communication links 125. Coverage area 110 can be an example of a geographical area where base station 105 and UE 115 can support signal transmission according to one or more wireless access technologies.

[0059] UE 115 can be distributed throughout the entire coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary, mobile, or both at different times. UE 115 can be devices of different forms or with different capabilities. Figure 1 Some example UE 115s are shown in the document. The UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s, base station 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as... Figure 1 As shown.

[0060] Base station 105 can communicate with core network 130, communicate with each other, or perform both operations. For example, base station 105 can interface with core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 can communicate directly (e.g., directly between base stations 105) on backhaul links 120 (e.g., via X2, Xn, or other interfaces), or indirectly (e.g., via core network 130), or perform both operations. In some examples, backhaul link 120 can be one or more radio links or may include one or more radio links.

[0061] 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 wireless base station, an access point, a wireless 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 gNB), a home node B, a home evolved node B, or some other suitable term.

[0062] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or user equipment, or some other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, and other examples. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, among others, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which, among other examples, may be implemented in various objects such as electrical appliances, vehicles, or instruments.

[0063] The UE 115 described herein is capable of communicating with various types of devices, such as other UEs 115 that can sometimes act as repeaters, as well as base station 105 and network devices, including, among other examples, macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, such as... Figure 1 As shown in the image.

[0064] UE 115 and base station 105 can communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" refers to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating the operation of the carrier, user data, or other signaling. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0065] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition or control signaling for coordinating the operation of other carriers. The 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 positioned according to a channel grid for discovery by UE 115. The carrier may operate in standalone mode, where UE 115 may perform initial acquisition and connection via the carrier, or the carrier may operate in non-standalone mode, where different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0066] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0067] A carrier can be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth can be referred to as the carrier or the "system bandwidth" of the wireless communication system 100. For example, the carrier bandwidth can be one of several defined bandwidths of a carrier for a specific wireless access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) can have a hardware configuration that supports communication on a specific carrier bandwidth, or can be configured to support communication on one carrier bandwidth in a set of carrier bandwidths. In some examples, the wireless communication system 100 can include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 can be configured to operate on a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0068] The signal waveform transmitted on a carrier can consist of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Spread Spectrum OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element can consist of one symbol period (e.g., the duration of a modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element can 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 UE 115 receives and the higher the order of the modulation scheme, the higher the data rate can be for UE 115. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity used for communication with UE 115.

[0069] One or more digital schemes can be supported for the carrier, where the digital scheme may include subcarrier spacing (Δf) and a cyclic prefix. The carrier can be divided into one or more BWPs with the same or different digital schemes. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for the carrier is active at a given time, and communication for UE 115 can be restricted to one or more active BWPs.

[0070] It can be expressed in a basic unit of time (which can be, for example, T). s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, and N f The time interval for base station 105 or UE 115 can be represented as a multiple of the maximum supported Discrete Fourier Transform (DFT) size. The time interval for communication resources can be organized based on radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0071] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided (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., this depends on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N) f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0072] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0073] Physical channels can be multiplexed on a carrier using various techniques. For example, one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by multiple symbol periods and can extend over the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) can be configured for a set of UEs 115. For example, one or more UEs in UE 115 can monitor or search for control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates from one or more aggregation levels arranged in a cascaded manner. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set used to send control information to a specific UE 115.

[0074] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used (e.g., on a carrier) to communicate with base station 105 and may be associated with an identifier used to distinguish neighboring cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or other identifier). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors (such as the capabilities of base station 105), the range of such cells can range from small areas (e.g., structures, subsets of structures) to large areas. For example, a cell may be or may include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, and other examples.

[0075] Macro cells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access by UE 115 with a service subscription to a network provider supporting the macro cell. In contrast, small cells can be associated with a lower-power base station 105 and can operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells can provide unrestricted access to UE 115 with a service subscription to a network provider, or restricted access to UE 115 associated with a small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), or UE 115 associated with a user in a residence or office). Base station 105 can support one or more cells and can also support communication on one or more cells using one or more component carriers.

[0076] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0077] In some examples, base station 105 may be mobile, and therefore provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different wireless access technologies to provide coverage for various geographic coverage areas 110.

[0078] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, 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 mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private 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 service prioritization, 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 are used interchangeably herein.

[0079] In some examples, UE 115 can also communicate directly with other UE 115s on a device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UEs 115s utilizing D2D communication can be within the geographic coverage area 110 of base station 105. Other UEs 115s in such a group can be outside the geographic coverage area 110 of base station 105, or otherwise unable to receive transmissions from base station 105. In some examples, multiple groups of UEs 115 communicating via D2D communication can utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base station 105.

[0080] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), and can include at least one control plane entity (e.g., a Mobility Management Entity (MME), Access and Mobility Management Function Unit (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function Unit (UPF)) for routing or interconnecting packets to external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by base station 105 associated with core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to IP services 150 for one or more network operators. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0081] Some network devices (e.g., base station 105) may include sub-components such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145 (which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP)). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across individual network devices (e.g., radio headends and ANCs) or incorporated into a single network device (e.g., base station 105).

[0082] Wireless communication system 100 can operate using one or more frequency bands (typically in the range of 300 MHz to 300 GHz). The region from 300 MHz to 3 GHz is often referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range extends from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves can be sufficiently permeable to penetrate structures for use in macrocells to provide service to UE 115 located indoors. Compared to the transmission of smaller frequencies and longer waves in the lower 300 MHz portion of the spectrum in the High Frequency (HF) or Very High Frequency (VHF) regions, UHF wave transmission can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0083] Wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, wireless communication system 100 can employ Licensed Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio frequency spectrum bands, devices (such as base station 105 and UE 115) can employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands can be based on carrier aggregation configurations that combine component carriers operating in licensed frequency bands (e.g., LAA). Among other examples, operation in unlicensed spectrum can include downlink transmissions, uplink transmissions, peer-to-peer (P2P) transmissions, or digital-to-digital (D2D) transmissions.

[0084] Base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operation 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 base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Alternatively or additionally, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0085] Base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such a technique can be called spatial multiplexing. For example, a transmitting device can transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device can receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) (where multiple spatial layers are transmitted to the same receiving device) and multi-user MIMO (MU-MIMO) (where multiple spatial layers are transmitted to multiple devices).

[0086] 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 or receiving device (e.g., base station 105 or UE 115) to form or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals transmitted via the antenna elements can include applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with the transmitting or receiving device. The adjustments associated with each antenna element can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting or receiving device, or relative to some other orientation).

[0087] As part of beamforming operations, base station 105 or UE 115 may use beam scanning techniques. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as base station 105) or by a receiving device (such as UE 115)) to identify the beam direction for subsequent transmissions or receptions performed by base station 105.

[0088] Base station 105 may transmit signals (e.g., data signals associated with a specific receiving device, such as UE 115) in a single beam direction (e.g., a direction associated with a particular receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a 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 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 that has the highest signal quality or otherwise acceptable signal quality.

[0089] In some examples, multiple beam directions can be used to perform transmissions by a device (e.g., base station 105 or UE 115), and the device can use a combination of digital precoding or radio frequency beamforming to generate combined beams for (e.g., from base station 105 to UE 115) transmissions. UE 115 can report feedback indicating precoding weights for one or more beam directions, and this feedback can correspond to a configured number of beams spanning the system bandwidth or one or more subbands. Base station 105 can transmit reference signals that can be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)). UE 115 can provide feedback on beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmissions or receptions by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0090] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, the receiving device (e.g., UE 115) can attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device can attempt multiple receiving directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different sets of receiving beamforming weights applied to 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 receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array. Any of these operations can be referred to as "listening" according to different receiving configurations or receiving directions. In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving data signals). A single receiver configuration can be aligned on a beam direction determined based on listening to different receiver 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 to multiple beam directions).

[0091] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet fragmentation and reassembly for transmission over logical channels. The Media Access Control (MAC) layer can perform priority handling and multiplexing of logical channels to transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmissions 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 RRC connections between the UE 115 and the base station 105 or core network 130 (which supports radio bearers for user plane data). At the physical layer, transport channels can be mapped to physical channels.

[0092] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correct data reception on communication link 125. HARQ can include a combination of error detection (e.g., using 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 and noise conditions). In some examples, the device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in a previous symbol within a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0093] In some cases, the UE 115 and base station 105 of the wireless communication system 100 may support techniques for configuring temporary reference signals for SCell activation. Specifically, the UE 115 of the wireless communication system 100 may be configured to receive aperiodic reference signals (e.g., temporary reference signals) on SCells (e.g., SCells provided by the same or different base stations 105 providing PCells) to reduce the activation time of the SCell. For example, the UE 115 of the wireless communication system 100 may perform wireless communication with a first serving cell (e.g., PCell) supported by base station 105. In this example, base station 105 may send an indication to the UE 115 that a second serving cell (e.g., SCell) supported by base station 105 will be activated at the UE 115. Base station 105 may activate the SCell at the UE 115 to increase data throughput, alleviate network congestion, or both. In some cases, the UE 115 may receive temporary reference signals on the SCell to reduce the duration of the SCell activation time. For example, UE 115 can determine the AGC associated with the SCell, the time / frequency tracking associated with the SCell, or both, based on the received temporary reference signal, thereby enabling UE 115 to initiate communication with the SCell relatively quickly compared to the duration of such activation using a reference signal with a relatively long period (such a reference signal is transmitted using SSB).

[0094] In some cases, the activation message used to activate the SCell may provide an indication of one or more parameters of the temporary reference signal in the DCI sent to UE 115. In some cases, the same DCI scheduled to carry the activation command for the MAC-CE may be used to provide one or more parameters of the temporary reference signal. In other cases, separate DCIs indicating one or more parameters of the temporary reference signal may be sent. In still other cases, the MAC-CE may indicate one or more parameters of the temporary reference signal. Such a MAC-CE may be the same MAC-CE used to provide the SCell activation command or a different MAC-CE. Alternatively or additionally, one or more temporary reference signal parameters may be implicitly signaled by the activation command. For example, one or more reference signal parameters may be configured by RRC signaling and used when the SCell activation command is received at UE 115.

[0095] The techniques described herein can provide improved wireless communication by reducing the duration of SCell activation. Specifically, by receiving a reference signal (e.g., a temporary reference signal, a tracking reference signal, a non-zero power CSI-RS with higher layer parameters such as trs-Info) on the activated SCell, UE 115 is able to determine information associated with the SCell (e.g., AGC, time / frequency tracking), and this information determined based on the reference signal can therefore reduce the duration of SCell activation compared to using a periodic SSB to determine the information. By reducing the activation duration for SCell activation at UE 115, the techniques described herein can improve the efficiency and reliability of wireless communication and enhance the overall user experience.

[0096] Figure 2 Examples of a wireless communication system 200 supporting reference signal configurations for SCell activation according to various aspects of this disclosure are shown. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. The wireless communication system 200 may include a UE 115-a and a base station 105-a, which may be as referenced Figure 1 Examples of UE 115 and base station 105 described.

[0097] The wireless communication system 200 can support wireless communication with wireless devices (e.g., UE 115-a) via one or more serving cells 205 of the wireless communication system 200. Specifically, each serving cell 205 can be supported by one or more base stations 105 of the wireless communication system 200. For example, as Figure 2 As shown, the wireless communication system 200 may include a first serving cell 205-a (e.g., PCell) supported by base station 105-a and a second serving cell 205-b (e.g., SCell) supported by base station 105-a. The serving cell 205 may also be a primary / secondary cell (PSCell) of a secondary cell group (SCG), or any combination of PCell, SCell, or PSCell of an SCG. The wireless communication system 200 may include any number of serving cells 205 supported by any number of base stations 105. For example, in additional or alternative cases, the first cell 205-a may be supported by base station 105-a, and the second cell 205-b may be supported by a second base station different from base station 105-a.

[0098] In some cases, the first serving cell 205-a and the second serving cell 205-b may be associated with the same frequency band (e.g., in-band carrier aggregation). In some cases, the first serving cell 205-a, the second serving cell 205-b, or both may include a PCell, an SCell, a PSCell of an SCG, or any combination thereof. For example, if the first serving cell 205-a includes a PCell, the second serving cell 205-b may include an SCell. As another example, if the first serving cell 205-a includes an SCell, the second serving cell 205-b may include an additional SCell. Furthermore, if the first serving cell 205-a includes a PSCell of an SCG, the second serving cell 205-b may include an SCell of an SCG.

[0099] In some cases, the first serving cell 205-a, the second serving cell 205-b, or both may be associated with a given radio access technology (such as 5G radio access technology, NR access technology, 4G radio access technology, LTE radio access technology, or any combination thereof). In some cases, the techniques described herein can be implemented in the context of a dual-connectivity scenario. In this regard, the second serving cell 205-b may be associated with the same or different radio access technology as associated with the first serving cell 205-a. For example, if the first serving cell 205-a is associated with 5G or NR access technology, the second serving cell 205-b may be associated with 4G radio access technology, LTE radio access technology, or both. Furthermore, in some cases, the first serving cell 205-a and the second serving cell 205-b may be associated with different frequency bands associated with common radio access technologies. For example, in some cases, both the first serving cell 205-a and the second serving cell 205-b can be associated with NR access technology, wherein the first serving cell 205-a is associated with the frequency range one (FR1) band of NR access technology, and the second serving cell 205-b is associated with the FR2 band of NR access technology.

[0100] In some cases, UE 115-a may use one or more beams, one or more carriers, one or more communication links, or any combination thereof, to communicate with base station 105-a. For example, each serving cell 205 may be associated with different frequency ranges, separate beams, separate component carriers, and / or communication links to facilitate wireless communication between UE 115-a and the corresponding serving cell 205. For example, UE 115-a may communicate with base station 105-a via communication link 210, wherein communication link 210 includes a first component carrier 215-a and a second component carrier 215-b. In some cases, the first component carrier 215-a may be associated with a first serving cell 205-a, and the second component carrier 215-b may be associated with a second serving cell 205-b. In some cases, communication link 210 may include examples of an access link (e.g., a Uu link). Communication link 210 may include a bidirectional link that may include both uplink and downlink communication. For example, UE 115-a can use communication link 210 to send uplink transmissions, such as uplink control signals or uplink data signals, to base station 105-a, and base station 105-a can use communication link 210 to send downlink transmissions, such as downlink control signals or downlink data signals, to UE 115-a.

[0101] In some cases, the UE 115-a and base station 105-a of the wireless communication system 200 may support techniques for SCell activation using a temporary reference signal, wherein the temporary reference signal configuration may be indicated by downlink communication associated with an activation command for the SCell. Specifically, the UE 115-a of the wireless communication system 200 may be configured to receive a reference signal (e.g., a temporary reference signal) on a second serving cell 205-b supported by base station 105-a in order to reduce the activation time of wireless communication on the second serving cell 205-b due to the activation of the second serving cell 205-b supported by base station 105-a.

[0102] For example, UE 115-a can establish wireless communication with the first serving cell 205-a. In some cases, UE 115-a can establish wireless communication with the first serving cell 205-a by initiating or otherwise performing an establishment process with the first serving cell 205-a. In some cases, UE 115-a can receive control message 220 from base station 105-a via the first serving cell 205-a (e.g., via the first component carrier 215-a). In some cases, control message 220 may include configuration information indicating whether a temporary reference signal is enabled, activation information for such a temporary reference signal, one or more parameters for the temporary reference signal, or any combination thereof. Control message 220 may include RRC messages, System Information Block (SIB) messages, SSB messages, or any combination thereof. In some aspects, UE 115-a can receive control message 220 based on establishing wireless communication with the first serving cell 205-a.

[0103] In some aspects, UE 115-a may receive DCI message 225 from base station 105-a via first serving cell 205-a. This DCI message 225 schedules downlink transmissions from base station 105-a to UE 115-a (e.g., Physical Downlink Shared Channel (PDSCH) transmissions and / or MAC-CE message 230). For example, as... Figure 2 As shown, UE 115-a can receive DCI message 225 from base station 105-a via first serving cell 205-a (e.g., via first component carrier 215-a). DCI message 225 can be transmitted via physical downlink control channel (PDCCH) resources. In some cases, UE 115-a can receive DCI message 225 based on establishing wireless communication with first serving cell 205-a, receiving control message 220 (e.g., RRC message, SIB message, SSB message), or any combination thereof. In some cases, DCI message 225 may include an indication that a reference signal 240 (e.g., a temporary reference signal) associated with second serving cell 205-b has been activated (e.g., triggered, initiated). In this regard, UE 115-a can be configured to determine, based on the indication in DCI message 225, that UE 115-a can monitor reference signal 240 on second serving cell 205-b.

[0104] In some cases, UE 115-a can receive an instruction to activate the second serving cell 205-b from base station 105-a via the first serving cell 205-a. For example, as Figure 2As shown, UE 115-b can receive MAC-CE message 230 from base station 105-a via first serving cell 205-a (e.g., via first component carrier 215-a). In this example, MAC-CE message 230 may include an indication to activate second serving cell 205-b. In some cases, base station 105-a may send the indication to activate second serving cell 205-b based on DCI message 225 (e.g., the SCell activation message in MAC-CE message 230), and UE 115-a may receive this indication. For example, DCI message 225 may schedule PDSCH transmission (e.g., MAC-CE message 230), where the PDSCH transmission includes an indication to activate second serving cell 205-b.

[0105] In some aspects, based on the activation message, UE 115-a can determine a set of resources that UE 115-a can use to receive reference signal 240 (e.g., a temporary reference signal) from base station 105-a via second serving cell 205-b (e.g., via second component carrier 215-b). This set of resources may include a set of time resources (e.g., the time slot in which reference signal 240 is located), a set of frequency resources (e.g., the carrier in which reference signal 240 is located), a resource mapping of reference signal 240, a power offset (e.g., the power difference between reference signal 240 and one or more other communications (such as data or SSB transmissions) on second component carrier 215-b), a quasi-co-location (QCL) assumption for reference signal 240, a transmission configuration indicator (TCI) state for the reference signal, a set of spatial resources, or any combination thereof.

[0106] In some cases, the same DCI message 225 scheduled to carry the MAC-CE message 230 carrying the activation command can be used to provide one or more parameters of the reference signal 240. In other cases, separate DCIs indicating one or more parameters of the reference signal 240 can be sent, such as reference... Figure 5-6 The examples discussed herein. In some cases, DCI message 225 may have a fallback DCI format or a non-fallback DCI format. In some cases, the non-fallback DCI format is DCI format 1_1 or DCI format 1_2, and the fallback DCI format is DCI format 1_0. In some cases, DCI 1_1 or 1_2 may include a trigger indication for a reference signal 240 on the second serving cell 205-b.

[0107] In other cases, MAC-CE message 230 may indicate one or more parameters of reference signal 240 (e.g., the same MAC-CE message 230 used to provide a SCell activation command). In still other cases, different MAC-CE messages may indicate one or more parameters of reference signal 240, such as reference... Figure 7-8 The examples discussed herein. Alternatively, one or more of the reference signal 240 parameters may be implicitly signaled by the activation command. For example, one or more reference signal parameters may be configured by control message 220 (e.g., via RRC signaling) and used when the SCell activation command is received at UE 115-a.

[0108] In some cases, reference signal 240 (e.g., temporary reference signal) can be triggered on the second serving cell 205-b to be activated without an explicit trigger indication provided by DCI message 225 or MAC-CE message 230. In some cases, reference signal 240 can be triggered on the SCell to be activated and on an already activated cell in the same frequency band without an explicit trigger indication. In some cases, one or more of the following can be identified without explicit triggering signaling: the carrier in which the temporary reference signal is transmitted (e.g., the reference signal 240 can be activated on a carrier of an SCell to be activated, or an SCell to be activated in the same frequency band and any activated cell); the time slot in which the temporary reference signal is transmitted (e.g., the time slot can be configured by a higher layer with timing relative to the timing of the feedback message 235 of the PDSCH carrying the MAC-CE message 230 for SCell activation command, or relative to the timing of the start of a radio frame); the configuration of the temporary reference signal (e.g., resource mapping and / or power offset to data / SSB for the reference signal 240, which can be configured by higher layer signaling); the QCL assumption for the temporary reference signal, or the TCI state of the temporary reference signal (e.g., the QCL or TCI state can be configured by higher layer signaling).

[0109] In some cases, UE 115-a may send a feedback message 235 to base station 105 via first serving cell 205-a, second serving cell 205-b, or both. For example, if MAC-CE message 230 is received via first serving cell 205-a, UE 115-a may send feedback message 235 via first serving cell 205-a. In some cases, UE 115-a may send feedback message 235 to base station 105-a based on (e.g., in response to) receiving an indication to activate second serving cell 205-b. Feedback message 235 may include an acknowledgment (ACK) message, a negative acknowledgment (NACK) message, or both. For example, if the indication in MAC-CE message 230 includes activation of second serving cell 205-b, UE 115-a may send an ACK message in response to activation of second serving cell 205-b. In some cases, UE 115-a may determine and / or adjust the AGC associated with the second serving cell 205-b, the tracking associated with the second serving cell 205-b (e.g., time tracking, frequency tracking), or any combination thereof.

[0110] Figure 3 An example of a resource allocation scheme 300 supporting reference signal configuration for SCell activation according to various aspects of this disclosure is shown. In some examples, resource allocation scheme 300 may implement various aspects of wireless communication system 100 or 200. The resource allocation scheme 300 in this example illustrates the use of periodic reference signals for one or more cell measurements instead of temporary reference signals to activate the serving cell.

[0111] Resource allocation scheme 300 may include a first serving cell (i.e., PCell 305) and SCell 310 to be activated at the UE. In some cases, the base station serving SCell 310 (which may be the same base station serving PCell 305 or a different base station) may be configured to send SSB 315 to the UE via SCell 310 according to SSB period 320. For example, in the context of NR access technology, the base station may send SSB 315 according to a 10ms SSB period 320, a 20ms SSB period 320, or another duration.

[0112] The UE can receive DCI 325 via PCell 305, which schedules PDSCH transmissions from the base station to the UE (e.g., it includes a MAC-CE message with an activation command 330 for SCell 310). The UE can then receive PDSCH transmissions (e.g., MAC-CE messages) based on DCI 325. In response to successfully receiving an indication to activate SCell 310 via PDSCH transmission, the UE can send a feedback message 335 (e.g., an ACK message) to the base station via PCell 305.

[0113] In this example, the SCell activation time can be based on activation time 345, timing of feedback message 335, SSB period 320, and timing for Channel State Information (CSI) reporting. In some cases, the time used for SCell activation can be determined as follows:

[0114] SCell activation delay = {T HARQ +T 激活时间 +T CSI报告} / NR slot length

[0115] Where T HARQ The timeline 340 is from activation command 330 until feedback message 335 (e.g., HARQ ACK) is sent. 激活时间 It is related to the first SSB 315-c(T) FirstSSB Adding 5ms corresponds to an activation time of 345, where T FirstSSB It is indicated by the SSB Measurement Timing Configuration (SMTC) in time slot n (with PDSCH) + T HARQ +3ms later, the time to the first SSB 315-c, and where T CSI报告 It is a delay of 350 until the first available CSI report, including the uncertainty of CSI-RS resources and CSI reports.

[0116] Therefore, without transmitting a temporary reference signal on SCell 310, the UE can use the signal provided by SSB 315 to perform measurements and activate SCell 310. In some cases, the base station may not trigger a temporary reference signal, and therefore... Figure 3The timing shown can be used for SCell 310 activation. For example, when the PDSCH resources used for transmitting PDSCH transmissions are relatively close to a measurable SSB 315, the base station can determine not to trigger a temporary reference signal. In other cases, the base station can trigger a temporary reference signal (e.g., in MAC-CE), but after formatting a transport block with MAC-CE, the base station can determine that it will not transmit a temporary reference signal and can indicate in the DCI that the temporary reference signal is canceled. In this case, the timing for SCell 310 activation can be as follows: Figure 3 As shown. Reference Figure 8 The examples discussed in more detail are those of base station cancellation of temporary reference signal triggering.

[0117] Figure 4 Another example of a resource allocation scheme 400 supporting reference signal configuration for SCell activation according to various aspects of this disclosure is shown. In some examples, resource allocation scheme 400 may implement various aspects of wireless communication system 100 or 200. The resource allocation scheme 400 in this example illustrates the use of a temporary reference signal 455 for one or more cell measurements instead of a periodic reference signal to activate the serving cell.

[0118] Similar to the above, resource allocation scheme 400 may include a first serving cell (i.e., PCell 405) and an SCell 410 to be activated at the UE. In some cases, the base station serving SCell 410 (which may be the same base station as the base station serving PCell 405 or a different base station) may be configured to send an SSB message 415 to the UE via SCell 410 according to SSB cycle 420. The UE may receive a DCI 425 via PCell 405, which schedules a PDSCH transmission 430 from the base station to the UE (e.g., which includes a MAC-CE message with an activation command for SCell 410). Subsequently, the UE may receive the PDSCH transmission 430 (e.g., a MAC-CE message) based on the DCI 425. In response to successfully receiving an indication to activate SCell 410 via PDSCH transmission 430, the UE may send a feedback message 435 (e.g., an ACK message) to the base station via PCell 405.

[0119] In some aspects, PDSCH transmission 430 (e.g., a MAC-CE message) can trigger UE measurement of provisional reference signal 455. In this example, provisional reference signal 455 can be transmitted on SCell 410, and can allow such measurements to be performed prior to UE measurements using a reference signal provided by SSB message 415 in other cases, such as reference... Figure 3The discussion continues. In this example, the SCell activation delay can again be determined as:

[0120] SCell activation delay = {T HARQ +T 激活时间 +T CSI报告} / NR slot length

[0121] Where T HARQ This is the timeline 340 from activation command 330 until feedback message 435 (e.g., HARQ ACK) is sent. However, in this case, T 激活时间 445 relative to Figure 3 The example is reduced, and compared with the temporary reference signal 455 time (T) tempRS Adding 5ms corresponds to T tempRS It is in time slot n (with PDSCH) + T HARQ +3ms later, the time to the temporary reference signal 455. T GSI报告 The value is the delay time of 450 until the first available CSI report, including the uncertainty of CSI-RS resources and CSI reports.

[0122] Therefore, in this example, the SCell activation delay is relative to Figure 3 The reduced SCell activation latency discussed in the examples can lead to faster SCell 410 activation, higher throughput, reduced latency, and other benefits. Depending on the aspects discussed herein, one or more parameters of the temporary reference signal 455 can be indicated by DCI 425, MAC-CE in PDSCH transmission 430, different DCIs or MAC-CEs, or combinations thereof, several examples of which are discussed herein. Alternatively, the UE can be configured to implicitly determine that the temporary reference signal 455 on SCell 410 has been activated and determine one or more parameters associated with it, as discussed herein.

[0123] In some cases, one or more parameters associated with the temporary reference signal 455 may include, for example, the carrier in which the temporary reference signal 455 is transmitted. In some cases, the temporary reference signal 455 may be an aperiodic transmission of a tracking reference signal (TRS). In some cases, for aperiodic TRS transmissions, the carrier may be notified by one or more carriers of the corresponding CSI-ReportConfig associated with a CSI-AssociatedReportConfigInfo (e.g., which provides information for the TRS as a non-zero power (NZP) channel state information reference signal (CSI-RS)), and in some examples, aspects of the CSI request field may be reused to trigger the temporary reference signal 455 and provide carrier information. One or more parameters of the temporary reference signal 455 may also include the time slot in which the temporary reference signal 455 is transmitted. When using TRS, time slots can be notified via aperiodicTriggeringOffset in NZP-CSI-RS-ResourceSet in CSI-ResourceConfig. aperiodicTriggeringOffset indicates the number of time slots from the aperiodic TRS used to trigger DCI to the aperiodic TRS transmission. Such signaling can be reused if the CSI request field is reused to trigger temporary reference signal 455.

[0124] One or more parameters of the temporary reference signal 455 may also include the configuration of the temporary reference signal 455, such as resource mapping or power offset to data / SSB. When using a TRS, the configuration can be notified via NZP-CSI-RS-ResourceSet, which is configured as an entry for aperiodicTriggeringOffset in CSI-AperiodicTriggerStateList, and such signaling can be reused if the CSI request field is reused to trigger the temporary reference signal 455. One or more parameters of the temporary reference signal 455 may also include the QCL assumption or TCI state for the temporary reference signal 455. When a TRS is used as the temporary reference signal 455, the TRS may be QCL-compliant with a periodic TRS on the same carrier, which can be used to determine the QCL assumption or TCI state for the temporary reference signal 455. While a TRS is used as the temporary reference signal 455 in some cases, other reference signals may be used in addition to or in lieu of a TRS in other cases. For example, the temporary reference signal 455 may be an aperiodic CSI-RS, a periodic or semi-persistent CSI-RS (P / SP-CSI-RS), a probe reference signal (SRS), a reference signal based on a secondary synchronization signal (SSS) or a primary synchronization signal (PSS), or a combination thereof.

[0125] Figure 5 Another example of a resource allocation scheme 500 supporting reference signal configuration for SCell activation according to various aspects of this disclosure is shown. In some examples, resource allocation scheme 500 may implement various aspects of wireless communication system 100 or 200. The resource allocation scheme 500 in this example illustrates the use of a temporary reference signal 555 for one or more cell measurements to activate the serving cell.

[0126] Similar to the above, resource allocation scheme 500 may include a first serving cell (i.e., PCell 505) and an SCell 510 to be activated at the UE. In some cases, the base station serving SCell 510 (which may be the same base station as the base station serving PCell 505 or a different base station) may be configured to send an SSB message 515 to the UE via SCell 510 according to an SSB cycle 520. The UE may receive a DCI 525 via PCell 505, which schedules a PDSCH transmission 530 from the base station to the UE (e.g., which includes a MAC-CE message with an activation command for SCell 510). Subsequently, the UE may receive the PDSCH transmission 530 (e.g., a MAC-CE message) based on the DCI 525. In response to successfully receiving an indication to activate SCell 510 via the PDSCH transmission 530, the UE may send a feedback message 535 (e.g., an ACK message) to the base station via PCell 505.

[0127] In this example, DCI 525 can be used to provide one or more parameters associated with the temporary reference signal 555. In some cases, the DCI format of DCI 552 can inform the UE of one or more of the following: the carrier in which the temporary reference signal 555 is transmitted, the time slot in which the temporary reference signal 555 is transmitted, the configuration of the temporary reference signal 555 (e.g., resource mapping, power offset to data / SSB), or the QCL assumption or TCI state for the temporary reference signal 555. In some cases, the DCI format of DCI 525 informs the UE of temporary reference signal information, which schedules PDSCH transmission 530 carrying the SCell activation command MAC-CE. The DCI format may include PDSCH scheduling information for the scheduled cell (e.g., SCell 510) and temporary reference signal 555 triggering information for the SCell 510 to be activated. In some cases, the temporary reference signal 555 triggering information may include a request field defined in DCI format, which has parameters for the temporary reference signal 555 (e.g., the DCI may be reused as a CSI request field defined in downlink DCI format from an uplink grant). In some cases, the temporary reference signal 555 is triggered at least after a predetermined time period (e.g., 3 ms) following the transmission of the feedback message 535 for PDSCH transmission 530.

[0128] Figure 6An example of a resource allocation scheme 600 supporting reference signal configuration for SCell activation according to various aspects of this disclosure is shown. In some examples, resource allocation scheme 600 may implement various aspects of wireless communication system 100 or 200. The resource allocation scheme 600 in this example illustrates the use of a temporary reference signal 655 for one or more cell measurements to activate the serving cell.

[0129] Similar to the above, resource allocation scheme 600 may include a first serving cell (i.e., PCell 605) and an SCell 610 to be activated at the UE. In some cases, the base station serving SCell 610 (which may be the same base station serving PCell 605 or a different base station) may be configured to send an SSB message 615 to the UE via SCell 610 according to SSB cycle 620. The UE may receive a DCI 625 via PCell 605, which schedules a PDSCH transmission 630 from the base station to the UE (e.g., which includes a MAC-CE message with an activation command for SCell 610). Subsequently, the UE may receive the PDSCH transmission 630 (e.g., a MAC-CE message) based on DCI 625. In response to successfully receiving an indication to activate SCell 610 via PDSCH transmission 630, the UE may send a feedback message 635 (e.g., an ACK message) to the base station via PCell 605.

[0130] In this example, the second DCI 660 can be used to provide one or more parameters associated with the temporary reference signal 655. In some cases, the DCI format of the second DCI 660 may differ from the DCI format of DCI 625, which schedules PDSCH transmission 630 carrying the SCell activation command MAC-CE. In some cases, the second DCI format includes PDSCH scheduling information for the scheduled cell (e.g., PCell 605) and temporary reference signal 655 triggering information for the SCell 610 to be activated. In some cases, the temporary reference signal 655 triggering information may include a request field indicating the definition of one or more reference signal parameters (e.g., the request field may reuse a CSI request field from an uplink grant, similar to the reference signal). Figure 5 (Discussed). In some cases, a temporary reference signal 655 may be triggered at least a predetermined period of time (e.g., 3ms) after the ACK / NACK transmission (e.g., feedback message 635) used for PDSCH transmission 630.

[0131] In other cases, the second DCI format does not include PDSCH scheduling information for any cell, but does include temporary reference signal 655 triggering information for the SCell 610 to be activated. The temporary reference signal 655 triggering information may be provided again in the request field, and in some cases, may be a reuse of the PDSCH scheduling information field (e.g., the Frequency Domain Resource Assignment (FDRA) field). In some cases, the temporary reference signal 655 may be triggered at least a predetermined time period (e.g., 3 ms) after the second DCI 660 with the temporary reference signal 655 trigger, or at least a predetermined time period (e.g., 3 ms) after the second ACK / NACK transmission 665 for the second DCI 660 (if HARQ feedback reception for the associated PDCCH is enabled).

[0132] As discussed, in some cases, the DCI from the base station may include fields providing indications of one or more Temporary Reference Signal 655 parameters. In some cases, the DCI may reuse the CSI request field from uplink grants to indicate the Temporary Reference Signal 655 parameters, where the number of bits in the field is determined by RRC signaling configuration or by the number of TRS trigger states. In some cases, for one or more serving cells, the TRS trigger field is linked to {TRS timing / slot, TRS configuration (resources and / or power offset)}. In other cases, the DCI may reuse one or more PDSCH scheduling information fields in the downlink DCI format used to trigger the Temporary Reference Signal 655. For example, the time / frequency resources mapped to the Temporary Reference Signal 655 may be indicated by the FDRA / TDRA fields that may exist for PDSCH scheduling.

[0133] In some cases, both fallback DCI formats (e.g., DCI format 1_0) and non-fallback DCI formats (e.g., DCI format 1_1) support triggering of the temporary reference signal 655 via DCI. In some cases, the temporary reference signal trigger field can indicate the absence of transmission of the temporary reference signal 655; in this case, the UE uses a reference signal to trigger the signal. Figure 3 The example discussed utilizes SSB for activation in a similar manner. In some cases, temporary reference signal 655 triggering via DCI is supported only for specific DCI formats. For example, a specific DCI format might be a non-backoff DCI format (e.g., DCI format 1_1), and if the PDSCH carrying the MAC-CE for SCell 610 activation is scheduled by a backoff DCI format (e.g., DCI format 1_0), the DCI format might not have a temporary reference signal triggering field, and it is assumed that no temporary reference signal is transmitted. In this case, the UE can trigger the signal with a reference signal. Figure 3 The example discussed uses a similar approach to activate via SSB. In some cases, a specific DCI format is explicitly configured by the base station via RRC signaling. In other cases, temporary reference signal 655 triggering via DCI may be supported only for DCI formats in one (or more) specific search space sets. For example, a specific search space set may be a UE-specific search space set, and if the PDSCH carrying the MAC-CE for SCell 610 activation is scheduled via a DCI format in a common search space (CSS) set, the DCI format may not have a temporary reference signal triggering field, and it is assumed that no temporary reference signal (e.g., similar to a reference) is transmitted. Figure 3 (As discussed). In some cases, a specific search space set is explicitly configured by the base station via RRC signaling.

[0134] Figure 7 An example of a resource allocation scheme 700 supporting reference signal configuration for SCell activation according to various aspects of this disclosure is shown. In some examples, resource allocation scheme 700 may implement various aspects of wireless communication system 100 or 200. The resource allocation scheme 700 in this example illustrates the use of a temporary reference signal 755 for one or more cell measurements to activate the serving cell.

[0135] Similar to the above, resource allocation scheme 700 may include a first serving cell (i.e., PCell 705) and an SCell 710 to be activated at the UE. In some cases, the base station serving SCell 710 (which may be the same base station serving PCell 705 or a different base station) may be configured to send an SSB message 715 to the UE via SCell 710 according to SSB cycle 720. The UE may receive a DCI 725 via PCell 705, which schedules a PDSCH transmission 730 from the base station to the UE (e.g., which includes a MAC-CE message with an activation command for SCell 710). Subsequently, the UE may receive the PDSCH transmission 730 (e.g., a MAC-CE message) based on the DCI 725. In response to successfully receiving an indication to activate SCell 710 via PDSCH transmission 730, the UE may send a feedback message 735 (e.g., an ACK message) to the base station via PCell 705.

[0136] In this example, the MAC-CE in the PDSCH transmission 730 can be used to provide one or more parameters associated with the temporary reference signal 755. For example, such a MAC-CE can provide indications of one or more of the following: the carrier in which the temporary reference signal 755 is transmitted, the time slot in which the temporary reference signal 755 is transmitted, the configuration of the temporary reference signal 755 (e.g., resource mapping or power offset to data / SSB), or the QCL assumption or TCI state for the temporary reference signal. In some cases, the PDSCH transmission 730 carrying a MAC-CE for SCell 710 activation also carries a MAC-CE for triggering the temporary reference signal 755. In this example, the PDSCH transmission 730 carrying a MAC-CE for SCell 710 activation also carries a MAC-CE triggered by the temporary reference signal 755 on the SCell 710 to be activated.

[0137] In some cases, the same MAC-CE can jointly indicate SCell 710 activation and temporary reference signal 755 triggering. In other cases, a first MAC-CE indicates SCell 710 activation, and another MAC-CE indicates temporary reference signal 755 triggering. In some cases, temporary reference signal 755 can be triggered at least a predetermined time period (e.g., 3 ms) after the transmission of feedback message 735 for PDSCH transmission 730.

[0138] Figure 8 An example of a resource allocation scheme 800 supporting reference signal configuration for SCell activation according to various aspects of this disclosure is shown. In some examples, resource allocation scheme 800 may implement various aspects of wireless communication system 100 or 200. The resource allocation scheme 800 in this example illustrates the use of a temporary reference signal 855 for one or more cell measurements to activate the serving cell.

[0139] Similar to the above, resource allocation scheme 800 may include a first serving cell (i.e., PCell 805) and an SCell 810 to be activated at the UE. In some cases, the base station serving SCell 810 (which may be the same base station as the base station serving PCell 805 or a different base station) may be configured to send an SSB message 815 to the UE via SCell 810 according to SSB cycle 820. The UE may receive a first DCI 825 via PCell 805, which schedules a first PDSCH transmission 830 from the base station to the UE (e.g., which includes a MAC-CE message with an activation command for SCell 810). Subsequently, the UE may receive the first PDSCH transmission 830 (e.g., a MAC-CE message) based on the first DCI 825. In response to successfully receiving an indication to activate SCell 810 via the first PDSCH transmission 830, the UE may send a feedback message 835 (e.g., an ACK / NACK message) to the base station via PCell 805.

[0140] In this example, the second DCI 870 can schedule a second PDSCH transmission 875, which includes a second MAC-CE that can be used to provide one or more parameters associated with the temporary reference signal 855. For example, such a second MAC-CE can provide indications of one or more of the following: the carrier in which the temporary reference signal 855 is transmitted, the time slot in which the temporary reference signal 855 is transmitted, the configuration of the temporary reference signal 855 (e.g., resource mapping or power offset to data / SSB), or the QCL assumption or TCI state for the temporary reference signal. Therefore, the first PDSCH transmission 830 indicates SCell 810 activation, and the second MAC-CE in the second PDSCH transmission 875 indicates the triggering of the temporary reference signal and the associated parameters. In some cases, the temporary reference signal 855 can be triggered at least a predetermined time period (e.g., 3 ms) after the ACK / NACK transmission 880 of the second PDSCH transmission 875.

[0141] Reference Figure 7 and 8For example, in some cases, the MAC-CE content cannot be changed once a transport block is generated. In such cases, once triggered by a temporary reference signal carrying the MAC-CE indication via the PDSCH, the indication is maintained throughout the initial transmission of the transport block and any retransmissions. Therefore, if a base station wants to trigger a temporary reference signal for SCell activation at a certain timing, it may no longer want to trigger the temporary reference signal for SCell activation if PDSCH decoding fails and the PDSCH is retransmitted. For example, for a retransmission, it might be expected that the SSB on the SCell to be activated is available immediately after ACK+3ms for the PDSCH carrying the MAC-CE SCell activation command, and a temporary reference signal is not required. Therefore, for a retransmission, at the timing where a temporary reference signal for the relevant UE should be sent, a PDSCH for other UEs can be scheduled. In this case, the base station might want to prioritize scheduling PDSCH for other UEs rather than allocating resources to the temporary reference signal for SCell activation of the relevant UE.

[0142] To allow the base station to cancel the transmission of temporary reference signals, in some cases, the base station can disable the temporary reference signal indication provided in the MAC-CE via DCI indication. In some cases, temporary reference signal triggering via MAC-CE is enabled only when the PDSCH carrying the MAC-CE is scheduled by a specific DCI format. For example, the specific DCI format could be a non-backoff DCI format (e.g., DCI format 1_1), and if the PDSCH carrying the MAC-CE with the SCell activation command is scheduled by a backoff DCI format (e.g., DCI format 1_0), the DCI format may not have a temporary reference signal triggering field, and it is assumed that no temporary reference signal is transmitted. In this case, the UE uses a reference signal triggering method similar to... Figure 3 The proposed method utilizes SSB activation. Otherwise, if a non-backoff DCI format is used, a temporary reference signal is transmitted. In some cases, a specific DCI format can be explicitly configured by the base station via RRC signaling. In other cases, temporary reference signal triggering via MAC-CE is enabled only if the PDSCH carrying the MAC-CE is scheduled by a specific search space set. For example, a specific search space set could be a UE-specific search space set. Therefore, if the PDSCH carrying the MAC-CE for the SCell activation command is scheduled by a DCI format in a common search space (CSS) set, the DCI format may not have a temporary reference signal triggering field, and it is assumed that no temporary reference signal is transmitted. A specific search space set can be explicitly configured by the base station via RRC signaling.

[0143] Figure 9Examples of a reference signal activation field 900 supporting reference signal configuration for SCell activation according to various aspects of this disclosure are shown. In some examples, the reference signal activation field 900 may implement aspects of wireless communication system 100 or 200. (See reference...) Figure 7 and 8 As discussed, MAC-CE can be used to provide temporary reference signal triggering and one or more associated parameters.

[0144] The MAC-CE can trigger a temporary reference signal via one or more activation or trigger fields in the MAC-CE. In the first example 905, the MAC-CE jointly indicates SCell activation and temporary reference signal triggering. In this example 905, the SCell activation field 910 may include a Ci field indicating the SCell to be activated and a TRS trigger field 915 indicating temporary reference signal details {Ti,j} (where j = 0, 1, ...), the temporary reference signal details {Ti,j} carrying an indication of a temporary reference signal for a cell having index i or for the i-th cell in the SCell to be activated by the MAC-CE.

[0145] In the second example 920, the PDSCH carrying the MAC-CE for SCell activation may differ from the PDSCH carrying the MAC-CE for temporary reference signal triggering. In this example 920, the MAC-CE for SCell activation can be the same as a conventional MAC-CE, and the MAC-CE for temporary reference signal can have a TRS trigger field 925 in {Ti,j} (where j = 0, 1, ...), the TRS trigger field 925 carrying an indication for the temporary reference signal for the cell with index i. In the third example 930, the MAC-CE can have a carrier indication field 935 in {Ci} (where i = 0, 1, ...) and a TRS trigger field 940 in {Ti,j} (where j = 0, 1, ...), the carrier indication field 935 indicating which carrier triggers the temporary reference signal, and the TRS trigger field 940 carrying an indication for the temporary reference signal for the serving cell corresponding to Ci.

[0146] Figure 10 An example of a process flow 1000 supporting reference signal configuration for SCell activation according to various aspects of this disclosure is shown. In some examples, process flow 1000 may implement aspects of wireless communication system 100 or 200, and may implement... Figures 3 to 8The resource allocation scheme, or any combination thereof. For example, process flow 1000 may show UE 115-b receiving an indication from the first serving cell 205-c that SCell 205-d has been activated (and thus becomes the new serving cell for UE 115-b), receiving a reference signal on the SCell, and activating SCell 205-d (as referenced). Figure 1-9 (Description), and other aspects.

[0147] Process flow 1000 may include UE 115-b, first serving cell 205-c (e.g., PCell), and SCell 205-d, which may be as described in reference Figure 1 and 2 Examples of UE 115 and serving cell 205 are described. Specifically, the first serving cell 205-c may include an example of the serving cell 205 that will remain active at UE 115-b, and SCell 205-d may include an example of the serving cell 205 that will be activated. In some aspects, the first serving cell 205-c and SCell 205-d may be associated with a single base station 105 of a wireless communication system (e.g., Figure 2 The first serving cell 205-c and SCell 205-d may be associated with (e.g., supported by a single base station 105) as shown in the diagram. Alternatively, the first serving cell 205-c and SCell 205-d may be associated with (e.g., supported by different base stations 105) different base stations 105.

[0148] In some examples, the operations shown in process flow 1000 can be performed by hardware (e.g., including circuits, processing blocks, logic components, and other components), code executed by a processor (e.g., software), or any combination thereof. Alternative examples are possible, some of which may be performed in a different order than described or not at all. In some cases, steps may include additional features not mentioned below, or additional steps may be added.

[0149] At point 1005, UE 115-b can establish wireless communication with the first serving cell 205-c. In some aspects, UE 115-b can establish wireless communication with the first serving cell 205-c by initiating or otherwise performing an establishment procedure with the first serving cell 205-c. In some aspects, the first serving cell 205-c and SCell 205-d can be associated with the same frequency band (e.g., intra-band carrier aggregation) or different frequency bands (e.g., inter-band carrier aggregation). In some cases, the first serving cell 205-c, SCell 205-d, or both can be associated with a given radio access technology (such as 5G radio access technology, NR access technology, 4G radio access technology, LTE radio access technology, or any combination thereof). In some cases, the first serving cell 205-c can be associated with the same or different radio access technology as associated with SCell 205-d. Furthermore, in some cases, the first serving cell 205-c and SCell 205-d can be associated with different frequency bands associated with public radio access technologies. For example, in some cases, both cells can be associated with NR access technologies, where the first serving cell 205-c is associated with the FR1 band of the NR access technology, and SCell 205-d is associated with the FR2 band of the NR access technology.

[0150] At 1010, UE 115-b can receive DCI messages via the first serving cell 205-c. In some aspects, the DCI may include an indication of PDSCH resources available to UE 115-b for receiving MAC-CE for activating SCell 205-d. The DCI message may be transmitted via PDCCH resources. In some aspects, UE 115-b may receive the DCI message at 1010 based on wireless communication, reception control, or configuration messages (e.g., RRC messages, SIB messages, SSB messages), or any combination thereof, established at 1005 with the first serving cell 205-c.

[0151] In some aspects, the DCI message may include an indication that a reference signal (e.g., a temporary reference signal) associated with SCell 205-d has been activated (e.g., triggered, initiated). In this regard, UE 115-b may be configured to determine that UE 115-b can monitor the reference signal on SCell 205-d based on the indication in the DCI message.

[0152] At point 1015, UE 115-b can receive an indication of activating SCell 205-d from the base station via the first serving cell 205-c. In some aspects, the indication of activating SCell 205-d can be given via a MAC-CE message. In some aspects, the base station can send the indication of activating SCell 205-d based on a DCI message, and UE 115-b can receive this indication. For example, the DCI message can schedule a PDSCH transmission (e.g., a MAC-CE message), wherein the PDSCH transmission includes the indication of activating SCell 205-d. When the indication of activating SCell 205-d is transmitted via a MAC-CE message, the MAC-CE message can include an indication that a reference signal (e.g., a temporary reference signal) associated with SCell 205-d has been activated (e.g., triggered, initiated).

[0153] At position 1020, UE 115-b can send a feedback message to the base station via the first serving cell 205-c. In some aspects, UE 115-b can send a feedback message to the base station based on (e.g., in response to) receiving an indication to activate SCell 205-d. The feedback message can include an ACK message, a NACK message, or both. For example, if the indication includes activation of SCell 205-d, UE 115-b can send an ACK message in response to activation of SCell 205-d.

[0154] At position 1025, UE 115-b can determine one or more temporary reference signal parameters for SCell 205-d. The temporary reference signal parameters can be determined using various techniques as discussed herein. In some aspects, UE 115-b can determine that a temporary reference signal has been activated based on implicit determination, based on explicit signaling received from the base station, or both. Specifically, UE 115-b can be configured to determine that a reference signal associated with SCell 205-d has been activated based on receiving a DCI message, receiving an indication of SCell activation (e.g., a MAC-CE message), or both.

[0155] At 1030, UE 115-b can receive a reference signal from the base station via SCell 205-d. In some aspects, UE 115-a can receive the reference signal according to the techniques discussed herein. The reference signal may include, but is not limited to, a temporary reference signal. For example, a temporary reference signal may include a tracking reference signal, a non-zero power CSI-RS configured to track a reference signal, one or more other reference signals, or a combination thereof.

[0156] At 1035, UE 115-b can determine and / or adjust the AGC associated with SCell 205-d, the tracking associated with SCell 205-d (e.g., time tracking, frequency tracking), or any combination thereof. For example, the reference signal may include indications of the AGC and / or tracking associated with SCell 205-d.

[0157] At 1040, UE 115-b can wirelessly communicate with the first serving cell 205-c and SCell 205-d. For example, such communication may be based at least in part on the determined and / or adjusted AGC associated with SCell 205-d, the tracking associated with SCell 205-d (e.g., time tracking, frequency tracking), or any combination thereof.

[0158] Figure 11 A block diagram 1100 of a device 1105 supporting a reference signal configuration for SCell activation according to various aspects of this disclosure is shown. Device 1105 may be an example of various aspects of a UE 115 as described herein. Device 1105 may include a receiver 1110, a communications manager 1115, and a transmitter 1120. Device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0159] Receiver 1110 can 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 the configuration of reference signals for SCell activation). This information can be passed to other components of device 1105. Receiver 1110 can be a reference... Figure 14 Examples of various aspects of the transceiver 1420 are described. The receiver 1110 may utilize a single antenna or an array of antennas.

[0160] Communication manager 1115 can perform the following operations: receive from a base station an SCell activation message indicating that an SCell will also be activated at the UE in addition to the primary cell; identify one or more parameters of an aperiodic reference signal for cell activation measurement based on the SCell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof; and measure one or more characteristics of the SCell based on the aperiodic reference signal. Communication manager 1115 may be an example of various aspects of communication manager 1410 described herein.

[0161] The communication manager 1115 or its sub-components may be implemented in hardware, processor-executable code (e.g., software), or any combination thereof. If implemented in processor-executable code, the functionality of the communication manager 1115 or its sub-components may be performed by a general-purpose processor, central processing unit (CPU), graphics processing unit (GPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0162] The communication manager 1115 or its subcomponents may be physically located at various locations, including being distributed such that some functions are implemented by one or more physical components at different physical locations. In some examples, the communication manager 1115 or its subcomponents may be separate and distinct components, according to various aspects of this disclosure. In some examples, the communication manager 1115 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in this disclosure, or combinations thereof.

[0163] Transmitter 1120 can transmit signals generated by other components of device 1105. In some examples, transmitter 1120 may be co-located with receiver 1110 in a transceiver module. For example, transmitter 1120 may be a reference... Figure 14 Examples of various aspects of the transceiver 1420 are described. The transmitter 1120 may utilize a single antenna or an array of antennas.

[0164] Figure 12 A block diagram 1200 of a device 1205 supporting a reference signal configuration for SCell activation according to various aspects of this disclosure is shown. Device 1205 may be an example of aspects of device 1105 or UE 115 as described herein. Device 1205 may include a receiver 1210, a communications manager 1215, and a transmitter 1235. Device 1205 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0165] Receiver 1210 can 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 the configuration of reference signals for SCell activation). This information can be passed to other components of device 1205. Receiver 1210 can be a reference... Figure 14Examples of various aspects of the transceiver 1420 are described. The receiver 1210 may utilize a single antenna or an array of antennas.

[0166] Communication manager 1215 may be an example of aspects of communication manager 1115 as described herein. Communication manager 1215 may include SCell activation manager 1220, temporary reference signal manager 1225, and measurement manager 1230. Communication manager 1215 may be an example of aspects of communication manager 1410 as described herein.

[0167] The SCell activation manager 1220 can receive SCell activation messages from the base station indicating that SCells will also be activated at the UE in addition to the main cell.

[0168] The temporary reference signal manager 1225 can identify one or more parameters of an aperiodic reference signal for cell activation measurement based on the SCell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position for the aperiodic reference signal, a reference signal configuration for the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof.

[0169] The measurement manager 1230 can measure one or more characteristics of the SCell based on an aperiodic reference signal.

[0170] Transmitter 1235 can transmit signals generated by other components of device 1205. In some examples, transmitter 1235 may be co-located with receiver 1210 in a transceiver module. For example, transmitter 1235 may be a reference... Figure 14 Examples of various aspects of the transceiver 1420 are described. The transmitter 1235 may utilize a single antenna or an array of antennas.

[0171] Figure 13 A block diagram 1300 is shown of a communication manager 1305 supporting reference signal configuration for SCell activation according to various aspects of this disclosure. Communication manager 1305 may be an example of aspects of communication manager 1115, communication manager 1215, or communication manager 1410 described herein. Communication manager 1305 may include SCell activation manager 1310, temporary reference signal manager 1315, measurement manager 1320, and configuration manager 1325. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0172] The SCell activation manager 1310 can receive from the base station an SCell activation message indicating that an SCell will be activated at the UE in addition to the primary cell. In some examples, the SCell activation manager 1310 can receive from the base station a DCI indicating one or more parameters for the aperiodic reference signal. In some examples, the SCell activation manager 1310 can receive from the base station a DCI transmission for disabling the aperiodic reference signal after receiving a MAC-CE.

[0173] In some cases, the DCI schedules shared channel communications that provide SCell activation messages and indicate one or more parameters for an aperiodic reference signal. In some cases, the DCI is a separate DCI from the scheduling DCI, which schedules shared channel communications for providing SCell activation messages. In some cases, the separate DCI includes additional scheduling information for downlink shared channel communications with the UE and one or more parameters for the aperiodic reference signal. In some cases, the DCI has a fallback DCI format or a non-fallback DCI format.

[0174] In some cases, the first MAC-CE provides one or more parameters for the aperiodic reference signal, and the second MAC-CE provides a SCell activation message. In some cases, the first MAC-CE and the second MAC-CE are in the same downlink shared channel communication from the base station, or in different downlink shared channel communications from the base station. In some cases, the MAC-CE includes a first field and a second field, the first field indicating the SCell to be activated, and the second field indicating one or more parameters for the aperiodic reference signal for the SCell to be activated. In some cases, one or more parameters for the aperiodic reference signal are implicitly indicated by the MAC-CE carrying the SCell activation message.

[0175] The temporary reference signal manager 1315 can identify one or more parameters of an aperiodic reference signal for cell activation measurement based on the SCell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position for the aperiodic reference signal, a reference signal configuration for the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof.

[0176] In some examples, the temporary reference signal manager 1315 may receive a MAC-CE from the base station indicating one or more parameters for the aperiodic reference signal. In some cases, the aperiodic reference signal is transmitted after a time slot associated with the SCell activation message. In some cases, this time slot corresponds to a first predetermined time period after the UE's acknowledgment of the SCell activation message, a second predetermined time period after downlink control channel communication for providing DCI, or a third predetermined time period after the UE's acknowledgment of the DCI.

[0177] In some cases, one or more parameters for the aperiodic reference signal are provided in an information field in the DCI, and wherein the information field has the same format as the CSI request field transmitted in the DCI. In some cases, the separate DCI is included with downlink control channel communication that does not provide scheduling information for shared channel communication. In some cases, one or more parameters for the aperiodic reference signal are provided in one or more fields in the separate DCI, which are otherwise used for scheduling information for shared channel communication. In some cases, one or more parameters for the aperiodic reference signal are provided in an information field having the same format as the CSI request field in the uplink grant.

[0178] In some cases, the number of bits in the information field is configured by RRC signaling or determined based on the number of available Tracking Reference Signal (TRS) states. In some cases, the information field is mapped to one or more of the following for one or more serving cells: TRS timing or slots, TRS resources, TRS power offset, or any combination thereof. In some cases, one or more parameters for the aperiodic reference signal are provided in one or more of the following: FDRA field, TDRA field, or any combination thereof.

[0179] In some cases, the MAC-CE providing one or more parameters for the aperiodic reference signal also provides a SCell activation message. In some cases, the MAC-CE includes a field carrying an indication of one or more parameters for the aperiodic reference signal for two or more SCells. In some cases, the MAC-CE includes a first field indicating the carrier of the aperiodic reference signal and a second field indicating one or more other parameters for the aperiodic reference signal.

[0180] In some cases, if shared-channel communication carrying MAC-CE is scheduled by a pre-configured DCI format, aperiodic reference signaling is enabled. In other cases, if shared-channel communication carrying MAC-CE is scheduled by DCI transmissions within a DCI search space set configured via RRC signaling, aperiodic reference signaling is enabled.

[0181] Measurement Manager 1320 can measure one or more characteristics of the SCell based on an aperiodic reference signal. In some examples, Measurement Manager 1320 can trigger the measurement of the aperiodic reference signal via a DCI with a pre-configured DCI format. In some cases, the DCI instructs the UE not to measure the aperiodic reference signal, and the measurement of one or more characteristics of the SCell is based on one or more channel measurements of the synchronization signal block (SSB) associated with the SCell.

[0182] Configuration Manager 1325 can receive one or more of a DCI or MAC-CE that includes information associated with an aperiodic reference signal from the base station. In some examples, Configuration Manager 1325 can determine one or more parameters for the aperiodic reference signal based on the DCI, MAC-CE, implicit signaling, or a combination thereof. In some examples, measurements of the aperiodic reference signal are triggered by a DCI located in a pre-configured set of DCI search spaces. In some cases, one or more parameters for the aperiodic reference signal include one or more of the following: the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the resource mapping of the aperiodic reference signal, the power offset of the aperiodic reference signal relative to downlink shared channel or SSB transmission, the QCL assumption for the beam of the aperiodic reference signal, the TCI state of the aperiodic reference signal, or any combination thereof. In some cases, the pre-configured DCI format is configured by RRC signaling. In some cases, one or more pre-configured sets of DCI search spaces that may contain a DCI for triggering measurements of the aperiodic reference signal are configured by RRC signaling. In some cases, one or more parameters used for the aperiodic reference signal are pre-configured at the UE by higher-layer signaling.

[0183] Figure 14A diagram of a system 1400 including a device 1405 supporting a reference signal configuration for SCell activation is shown according to various aspects of this disclosure. Device 1405 may be an example of device 1105, device 1205, or UE 115 as described herein, or a component including device 1105, device 1205, or UE 115. Device 1405 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1410, an I / O controller 1415, a transceiver 1420, an antenna 1425, a memory 1430, and a processor 1440. These components may communicate electronically via one or more buses (e.g., bus 1445).

[0184] The communication manager 1410 can perform the following operations: receive from the base station an SCell activation message indicating that an SCell will be activated at the UE in addition to the primary cell; identify one or more parameters of an aperiodic reference signal for cell activation measurement based on the SCell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and measure one or more characteristics of the SCell based on the aperiodic reference signal.

[0185] I / O controller 1415 can manage input and output signals for device 1405. I / O controller 1415 can also manage peripheral devices not integrated into device 1405. In some cases, I / O controller 1415 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1415 can utilize, for example... This can be an operating system such as a modem, keyboard, mouse, touchscreen, or similar device, or an interaction with such devices. In some cases, the I / O controller 1415 may be implemented as part of a processor. In some cases, a user may interact with device 1405 via the I / O controller 1415 or via hardware components controlled by the I / O controller 1415.

[0186] Transceiver 1420 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, transceiver 1420 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1420 may also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna.

[0187] In some cases, a wireless device may include a single antenna 1425. However, in other cases, the device may have more than one antenna 1425, which are capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0188] Memory 1430 may include random access memory (RAM) and read-only memory (ROM). Memory 1430 may store computer-readable, computer-executable code 1435, which includes instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, in addition, memory 1430 may also include a basic input / output system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0189] Processor 1440 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, GPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1440 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1440. Processor 1440 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1430) to cause device 1405 to perform various functions (e.g., functions or tasks supporting reference signal configuration for SCell activation).

[0190] Code 1435 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 1435 may be stored in a non-transitory computer-readable medium (e.g., system memory or other types of memory). In some cases, code 1435 may not be directly executable by processor 1440, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0191] Figure 15 A block diagram 1500 of a device 1505 supporting a reference signal configuration for SCell activation, according to various aspects of this disclosure, is shown. Device 1505 may be an example of various aspects of base station 105 as described herein. Device 1505 may include a receiver 1510, a communication manager 1515, and a transmitter 1520. Device 1505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0192] Receiver 1510 can 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 the configuration of reference signals for SCell activation). This information can be passed to other components of device 1505. Receiver 1510 can be a reference... Figure 18 Examples of various aspects of the transceiver 1820 are described. The receiver 1510 may utilize a single antenna or an array of antennas.

[0193] The communication manager 1515 can perform the following operations: send an SCell activation message to the UE indicating that an SCell will also be activated at the UE in addition to the primary cell; identify one or more parameters for an aperiodic reference signal for the SCell based on the SCell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position for the aperiodic reference signal, a reference signal configuration for the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof; and send the aperiodic reference signal to the UE based on the identification. The communication manager 1515 may be an example of various aspects of the communication manager 1810 described herein.

[0194] The communication manager 1515 or its sub-components may be implemented in hardware, processor-executable code (e.g., software), or any combination thereof. If implemented in processor-executable code, the functionality of the communication manager 1515 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described in this disclosure.

[0195] The communication manager 1515 or its subcomponents may be physically located at various locations, including being distributed such that some functions are implemented by one or more physical components at different physical locations. In some examples, the communication manager 1515 or its subcomponents may be separate and distinct components, according to various aspects of this disclosure. In some examples, the communication manager 1515 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in this disclosure, or combinations thereof.

[0196] Transmitter 1520 can transmit signals generated by other components of device 1505. In some examples, transmitter 1520 can be co-located with receiver 1510 in a transceiver module. For example, transmitter 1520 can be a reference... Figure 18Examples of various aspects of the transceiver 1820 are described. The transmitter 1520 may utilize a single antenna or an array of antennas.

[0197] Figure 16 A block diagram 1600 of a device 1605 supporting a reference signal configuration for SCell activation according to various aspects of this disclosure is shown. Device 1605 may be an example of aspects of device 1505 or base station 105 as described herein. Device 1605 may include a receiver 1610, a communication manager 1615, and a transmitter 1630. Device 1605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0198] Receiver 1610 can 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 the configuration of reference signals for SCell activation). This information can be passed to other components of device 1605. Receiver 1610 can be a reference... Figure 18 Examples of various aspects of the transceiver 1820 are described. The receiver 1610 can utilize a single antenna or a set of antennas.

[0199] Communication manager 1615 may be an example of aspects of communication manager 1615 as described herein. Communication manager 1615 may include SCell activation manager 1620 and temporary reference signal manager 1625. Communication manager 1615 may be an example of aspects of communication manager 1810 as described herein.

[0200] The SCell activation manager 1620 can send an SCell activation message to the UE to indicate that an SCell will be activated at the UE in addition to the primary cell.

[0201] The temporary reference signal manager 1625 can identify one or more parameters for an aperiodic reference signal for the SCell based on the SCell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position for the aperiodic reference signal, a reference signal configuration for the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof; and transmit the aperiodic reference signal to the UE based on the identification.

[0202] Transmitter 1630 can transmit signals generated by other components of device 1605. In some examples, transmitter 1630 can be co-located with receiver 1610 in a transceiver module. For example, transmitter 1630 can be a reference... Figure 18 Examples of various aspects of the transceiver 1820 are described. The transmitter 1630 may utilize a single antenna or an array of antennas.

[0203] Figure 17 A block diagram 1700 is shown of a communication manager 1705 supporting reference signal configuration for SCell activation according to various aspects of this disclosure. Communication manager 1705 may be an example of aspects of communication manager 1515, communication manager 1615, or communication manager 1810 described herein. Communication manager 1705 may include SCell activation manager 1710, temporary reference signal manager 1715, configuration manager 1720, and measurement manager 1725. Each of these modules may communicate with each other directly or indirectly (e.g., via one or more buses).

[0204] The SCell activation manager 1710 can send an SCell activation message to the UE indicating that an SCell will also be activated at the UE in addition to the primary cell. In some examples, the SCell activation manager 1710 can send a DCI transmission to the UE after sending a MAC-CE to disable the aperiodic reference signal.

[0205] In some cases, the DCI schedules shared channel communications that provide a SCell activation message and indicate one or more parameters for an aperiodic reference signal. In some cases, the DCI is a separate DCI from the scheduling DCI, which schedules shared channel communications for providing a SCell activation message. In some cases, the separate DCI includes additional scheduling information for downlink shared channel communications with the UE and one or more parameters for the aperiodic reference signal. In some cases, the separate DCI is included with downlink control channel communications that do not provide scheduling information for shared channel communications. In some cases, one or more parameters for the aperiodic reference signal are provided in one or more fields in the separate DCI, which are otherwise used for scheduling information for shared channel communications. In some cases, the DCI has a fallback DCI format or a non-fallback DCI format.

[0206] In some cases, the first MAC-CE provides one or more parameters for the aperiodic reference signal, and the second MAC-CE provides a SCell activation message. In some cases, the first MAC-CE and the second MAC-CE are in the same downlink shared channel communication from the base station, or in different downlink shared channel communications from the base station. In some cases, the MAC-CE includes a first field indicating the SCell to be activated and a second field indicating one or more parameters for the aperiodic reference signal for the SCell to be activated. In some cases, the aperiodic reference signal is enabled if the shared channel communication carrying the MAC-CE is scheduled by a pre-configured DCI format. In some cases, one or more parameters for the aperiodic reference signal are implicitly indicated by the MAC-CE carrying the SCell activation message.

[0207] The temporary reference signal manager 1715 can identify one or more parameters for an aperiodic reference signal used for the SCell based on the SCell activation message. These parameters include a carrier wave for the aperiodic reference signal, a timeslot position for the aperiodic reference signal, a reference signal configuration for the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof. In some examples, the temporary reference signal manager 1715 can transmit the aperiodic reference signal to the UE based on this identification.

[0208] In some examples, the temporary reference signal manager 1715 may send to the UE one or more of a DCI or MAC-CE including information associated with an aperiodic reference signal, wherein one or more parameters for the aperiodic reference signal are indicated by the DCI, MAC-CE, implicit signaling, or any combination thereof. In some examples, the temporary reference signal manager 1715 may send to the UE a MAC-CE indicating one or more parameters for the aperiodic reference signal.

[0209] In some cases, one or more parameters used for the aperiodic reference signal include one or more of the following: the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the mapping of resources for the aperiodic reference signal, the power offset of the aperiodic reference signal relative to downlink shared channel or SSB transmission, the QCL assumption for the beam of the aperiodic reference signal, the TCI state of the aperiodic reference signal, or any combination thereof. In some cases, the aperiodic reference signal is transmitted after a time slot associated with the SCell activation message. In some cases, this time slot corresponds to a first predetermined time period after the UE's confirmation of the SCell activation message, a second predetermined time period after downlink control channel communication for providing DCI, or a third predetermined time period after the UE's confirmation of the DCI.

[0210] In some cases, one or more parameters for the aperiodic reference signal are provided in an information field in the DCI, and wherein the information field has the same format as the CSI request field sent in the DCI. In some cases, one or more parameters for the aperiodic reference signal are provided in one or more of the following: the FDRA field, the TDRA field, or any combination thereof. In some cases, the DCI instructs the UE not to measure the aperiodic reference signal, and wherein the UE measures one or more characteristics of the SCell based on one or more channel measurements of the SSB associated with the SCell.

[0211] In some cases, the MAC-CE used to provide one or more parameters for the aperiodic reference signal also provides a SCell activation message. In some cases, the MAC-CE includes a field for carrying an indication of one or more parameters for the aperiodic reference signal for two or more SCells. In some cases, the MAC-CE includes a first field for indicating the carrier of the aperiodic reference signal and a second field for indicating one or more other parameters for the aperiodic reference signal. In some cases, the aperiodic reference signal is enabled if the shared channel communication carrying the MAC-CE is scheduled by DCI transmissions in the DCI search space set configured via RRC signaling.

[0212] Configuration Manager 1720 can send a DCI to the UE indicating one or more parameters for an aperiodic reference signal. In some cases, the one or more parameters for the aperiodic reference signal are provided in an information field with the same format as the CSI request field in uplink granting. In some cases, the number of bits in the information field is configured by RRC signaling or determined based on the number of available Tracking Reference Signal (TRS) states. In some cases, the information field is mapped to one or more of the following for one or more serving cells: TRS timing or slots, TRS resources, TRS power offset, or any combination thereof. In some cases, the pre-configured DCI format is configured by RRC signaling. In some cases, one or more pre-configured DCI search space sets, which may contain a DCI for triggering measurements of the aperiodic reference signal, are configured by RRC signaling. In some cases, the one or more parameters for the aperiodic reference signal are pre-configured at the UE by higher-layer signaling.

[0213] The measurement manager 1725 can trigger measurements of an aperiodic reference signal using a DCI with a pre-configured DCI format. In some examples, measurements of the aperiodic reference signal are triggered by DCIs located in a pre-configured set of DCI search spaces.

[0214] Figure 18 A diagram of a system 1800 including a device 1805 supporting a reference signal configuration for SCell activation is shown according to various aspects of this disclosure. Device 1805 may be an example of device 1505, device 1605, or base station 105 as described herein, or a component including device 1505, device 1605, or base station 105. Device 1805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1810, a network communication manager 1815, a transceiver 1820, an antenna 1825, a memory 1830, a processor 1840, and an inter-station communication manager 1845. These components may communicate electronically via one or more buses (e.g., bus 1850).

[0215] The communication manager 1810 can perform the following operations: send a SCell activation message to the UE indicating that a SCell will also be activated at the UE in addition to the primary cell; identify one or more parameters of an aperiodic reference signal for the SCell based on the SCell activation message, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof; and send the aperiodic reference signal to the UE based on the identification.

[0216] The network communication manager 1815 can manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1815 can manage the transmission of data communication to client devices (e.g., one or more UEs 115).

[0217] Transceiver 1820 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, transceiver 1820 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1820 may also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and demodulating packets received from the antenna.

[0218] In some cases, a wireless device may include a single antenna 1825. However, in other cases, the device may have more than one antenna 1825, which are capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0219] Memory 1830 may include RAM, ROM, or a combination thereof. Memory 1830 may store computer-readable code 1835, which includes instructions that, when executed by a processor (e.g., processor 1840), cause device 1805 to perform the various functions described herein. In some cases, in addition to this, memory 1830 may also contain a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0220] Processor 1840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, GPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1840 may be configured to use a memory controller to operate a memory array. In some cases, the memory controller may be integrated into processor 1840. Processor 1840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1830) to cause device 1805 to perform various functions (e.g., functions or tasks supporting reference signal configuration for SCell activation).

[0221] Inter-site communication manager 1845 can manage communication with other base stations 105 and may include a controller or scheduler for cooperating with other base stations 105 to control communication with UE 115. For example, inter-site communication manager 1845 can coordinate the scheduling of transmissions to UE 115 to implement various interference mitigation techniques such as beamforming or joint transmission. In some examples, inter-site communication manager 1845 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0222] Code 1835 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 1835 may be stored in a non-transitory computer-readable medium (e.g., system memory or other types of memory). In some cases, code 1835 may not be directly executable by processor 1840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0223] Figure 19 A flowchart illustrating a method 1900 for configuring reference signals supporting SCell activation according to various aspects of this disclosure is shown. Operation of method 1900 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1900 can be implemented by a reference signal as described herein. Figures 11 to 14 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0224] At 1905, the UE can receive a SCell activation message from the base station indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at 1905 can be performed according to the method described herein. In some examples, aspects of the operation at 1905 can be described as follows: Figures 11 to 14 The SCell Activation Manager is described and executed.

[0225] At 1910, the UE can identify one or more parameters of the aperiodic reference signal used for cell activation measurements based on the SCell activation message. These parameters include the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the reference signal configuration of the aperiodic reference signal, the beam configuration of the aperiodic reference signal, or any combination thereof. Operation at 1910 can be performed according to the method described herein. In some examples, aspects of the operation at 1910 can be determined by, as referenced... Figures 11 to 14 The temporary reference signal manager described is used for execution.

[0226] At point 1915, the UE can measure one or more characteristics of the SCell based on an aperiodic reference signal. Operation at point 1915 can be performed according to the method described herein. In some examples, aspects of operation at point 1915 can be determined by, for example, a reference signal. Figures 11 to 14 The described measurement manager is used to perform this.

[0227] Figure 20 A flowchart illustrating a method 2000 for configuring reference signals supporting SCell activation according to various aspects of this disclosure is shown. Operation of method 2000 can be implemented by a UE 115 or its components as described herein. For example, operation of method 2000 can be implemented by a reference signal configuration as described herein. Figures 11 to 14 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0228] At point 2005, the UE can receive a SCell activation message from the base station indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at point 2005 can be performed according to the method described herein. In some examples, aspects of the operation at point 2005 can be determined by referring to... Figures 11 to 14 The SCell Activation Manager is described and executed.

[0229] At 2010, the UE can receive one or more of DCI or MAC-CE from the base station, including information associated with an aperiodic reference signal. Operation of 2010 can be performed according to the methods described herein. In some examples, aspects of the operation of 2010 can be determined by, as referenced... Figures 11 to 14 The configuration manager described is used to execute this.

[0230] At 2015, the UE can determine one or more parameters for the aperiodic reference signal based on DCI, MAC-CE, implicit signaling, or a combination thereof. Operation of 2015 can be performed according to the methods described herein. In some examples, aspects of the operation of 2015 can be determined by, for example, a reference signal. Figures 11 to 14 The configuration manager described is used to execute this. In some cases, one or more parameters for the aperiodic reference signal include one or more of the following: the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the mapping of resources for the aperiodic reference signal, the power offset of the aperiodic reference signal transmission relative to the downlink shared channel or synchronization signal block, the QCL assumption for the beam of the aperiodic reference signal, the TCI state of the aperiodic reference signal, or any combination thereof.

[0231] At 2020, the UE can measure one or more characteristics of the SCell based on an aperiodic reference signal. Operations at 2020 can be performed according to the methods described herein. In some examples, aspects of the operations at 2020 can be determined by, for example, a reference signal. Figures 11 to 14 The described measurement manager is used to perform this.

[0232] Figure 21 A flowchart illustrating a method 2100 for configuring reference signals supporting SCell activation according to various aspects of this disclosure is shown. Operation of method 2100 can be implemented by a UE 115 or its components as described herein. For example, operation of method 2100 can be implemented by a reference signal configuration as described herein. Figures 11 to 14 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0233] At step 2105, the UE can receive a SCell activation message from the base station indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at step 2105 can be performed according to the method described herein. In some examples, aspects of the operation at step 2105 can be derived from, as referenced... Figures 11 to 14 The SCell Activation Manager is described and executed.

[0234] At 2110, the UE can receive from the base station a DCI indicating one or more parameters for an aperiodic reference signal. Operation 2110 can be performed according to the method described herein. In some examples, aspects of the operation of 2110 can be determined by, as referenced... Figures 11 to 14 The SCell Activation Manager is described and executed.

[0235] At 2115, the UE can identify one or more parameters of the aperiodic reference signal used for cell activation measurements based on the DCI, wherein the one or more parameters include the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the reference signal configuration of the aperiodic reference signal, the beam configuration of the aperiodic reference signal, or any combination thereof. Operation 2115 can be performed according to the method described herein. In some examples, aspects of the operation of 2115 can be determined by reference to... Figures 11 to 14 The temporary reference signal manager described is used for execution.

[0236] At 2120, the UE can measure one or more characteristics of the SCell based on an aperiodic reference signal. The operation at 2120 can be performed according to the method described herein. In some examples, aspects of the operation at 2120 can be determined by, for example, a reference signal. Figures 11 to 14 The described measurement manager is used to perform this.

[0237] Figure 22 A flowchart illustrating a method 2200 for configuring reference signals supporting SCell activation according to various aspects of this disclosure is shown. Operation of method 2200 can be implemented by a UE 115 or its components as described herein. For example, operation of method 2200 can be implemented by a reference signal as described herein. Figures 11 to 14 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0238] At 2205, the UE can receive a SCell activation message from the base station indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at 2205 can be performed according to the method described herein. In some examples, aspects of the operation at 2205 can be derived from, as referenced... Figures 11 to 14 The SCell Activation Manager is described and executed.

[0239] At 2210, the UE can receive a MAC-CE from the base station indicating one or more parameters for an aperiodic reference signal. Operation of 2210 can be performed according to the methods described herein. In some examples, aspects of the operation of 2210 can be determined by reference to... Figures 11 to 14 The temporary reference signal manager described is used for execution.

[0240] At 2215, the UE can identify one or more parameters of an aperiodic reference signal used for cell activation measurements based on MAC-CE, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration for the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof. Operation 2215 can be performed according to the method described herein. In some examples, aspects of the operation of 2215 can be determined by reference to... Figures 11 to 14 The temporary reference signal manager described is used for execution.

[0241] At 2220, the UE can measure one or more characteristics of the SCell based on an aperiodic reference signal. Operation at 2220 can be performed according to the methods described herein. In some examples, aspects of operation at 2220 can be determined by, for example, a reference signal. Figures 11 to 14 The described measurement manager is used to perform this.

[0242] Figure 23A flowchart illustrating a method 2300 for configuring reference signals supporting SCell activation according to various aspects of this disclosure is shown. Operation of method 2300 can be implemented by a UE 115 or its components as described herein. For example, operation of method 2300 can be implemented by a reference signal as described herein. Figures 11 to 14 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0243] At 2305, the UE can receive a MAC-CE from the base station, the MAC-CE including a SCell activation message indicating that a SCell will also be activated at the UE in addition to the primary cell. Operation 2305 can be performed according to the method described herein. In some examples, aspects of operation 2305 can be derived from, as referenced... Figures 11 to 14 The SCell Activation Manager is described and executed.

[0244] At 2310, the UE can identify one or more parameters of an aperiodic reference signal used for cell activation measurements based on MAC-CE, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration for the aperiodic reference signal, a beam configuration for the aperiodic reference signal, or any combination thereof. Operation 2315 can be performed according to the method described herein. In some examples, aspects of operation 2315 can be determined by reference to... Figures 11 to 14 The temporary reference signal manager described is used for execution.

[0245] At 2315, the UE can receive a DCI transmission from the base station to disable the aperiodic reference signal after receiving the MAC-CE. Operation 2315 can be performed according to the method described herein. In some examples, aspects of operation 2315 can be determined by reference to... Figures 11 to 14 The SCell Activation Manager is described and executed.

[0246] Figure 24 A flowchart illustrating a method 2400 for configuring reference signals to support SCell activation according to various aspects of this disclosure is shown. Operation of method 2400 can be implemented by a base station 105 or its components as described herein. For example, operation of method 2400 can be implemented by, as described in reference... Figures 15 to 18 The communication manager described below is used to execute this. In some examples, the base station may execute a set of instructions to control the functional units of the base station to perform the functions described below. Alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0247] At point 2405, the base station can send a SCell activation message to the UE, indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at point 2405 can be performed according to the method described herein. In some examples, aspects of the operation at point 2405 can be described as follows: Figures 15 to 18 The SCell Activation Manager is described and executed.

[0248] At 2410, the base station can identify one or more parameters for the aperiodic reference signal used for the SCell based on the SCell activation message, wherein the one or more parameters include the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the reference signal configuration of the aperiodic reference signal, the beam configuration for the aperiodic reference signal, or any combination thereof. Operation of 2410 can be performed according to the method described herein. In some examples, aspects of the operation of 2410 can be determined by, as referenced... Figures 15 to 18 The temporary reference signal manager described is used for execution.

[0249] At point 2415, the base station can transmit an aperiodic reference signal to the UE based on this identification. Operation at point 2415 can be performed according to the method described herein. In some examples, aspects of the operation at point 2415 can be determined by, for example, a reference signal. Figures 15 to 18 The temporary reference signal manager described is used for execution.

[0250] Figure 25 A flowchart illustrating a method 2500 for configuring reference signals to support SCell activation according to various aspects of this disclosure is shown. Operation of method 2500 can be implemented by a base station 105 or its components as described herein. For example, operation of method 2500 can be implemented by... Figures 15 to 18 The communication manager described below is used to execute this. In some examples, the base station may execute a set of instructions to control the functional units of the base station to perform the functions described below. Alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0251] At point 2505, the base station can send a SCell activation message to the UE, indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at point 2505 can be performed according to the method described herein. In some examples, aspects of the operation at point 2505 can be described as follows: Figures 15 to 18 The SCell Activation Manager is described and executed.

[0252] At 2510, the base station may send to the UE one or more of DCI or MAC-CE including information associated with an aperiodic reference signal, wherein one or more parameters for the aperiodic reference signal are indicated by DCI, MAC-CE, implicit signaling, or any combination thereof. Operation of 2510 can be performed according to the methods described herein. In some examples, aspects of the operation of 2510 may be determined by reference to... Figures 15 to 18 The temporary reference signal manager described is used for execution.

[0253] At 2515, the base station can transmit an aperiodic reference signal to the UE based on one or more identified parameters for the aperiodic reference signal. Operation 2515 can be performed according to the method described herein. In some examples, aspects of operation 2515 can be determined by, as referenced... Figures 15 to 18 The temporary reference signal manager described is used for execution.

[0254] Figure 26 A flowchart illustrating a method 2600 for configuring reference signals to support SCell activation according to various aspects of this disclosure is shown. Operation of method 2600 can be implemented by a base station 105 or its components as described herein. For example, operation of method 2600 can be implemented by... Figures 15 to 18 The communication manager described below is used to execute this. In some examples, the base station may execute a set of instructions to control the functional units of the base station to perform the functions described below. Alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0255] At point 2605, the base station can send a SCell activation message to the UE, indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at point 2605 can be performed according to the method described herein. In some examples, aspects of the operation at point 2605 can be described as follows: Figures 15 to 18 The SCell Activation Manager is described and executed.

[0256] At 2610, the base station may send a DCI to the UE indicating one or more parameters for an aperiodic reference signal. Operation 2610 can be performed according to the method described herein. In some examples, aspects of the operation of 2610 may be determined by, as referenced... Figures 15 to 18 The configuration manager described is used to execute this. In some cases, one or more parameters include the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the reference signal configuration of the aperiodic reference signal, the beam configuration for the aperiodic reference signal, or any combination thereof.

[0257] At 2615, the base station can transmit an aperiodic reference signal to the UE based on one or more identified parameters for the aperiodic reference signal. Operation 2615 can be performed according to the method described herein. In some examples, aspects of the operation of 2615 can be determined by, as referenced... Figures 15 to 18 The temporary reference signal manager described is used for execution.

[0258] Figure 27 A flowchart illustrating a method 2700 for configuring reference signals to support SCell activation according to various aspects of this disclosure is shown. Operation of method 2700 can be implemented by a base station 105 or its components as described herein. For example, operation of method 2700 can be implemented by... Figures 15 to 18 The communication manager described below is used to execute this. In some examples, the base station may execute a set of instructions to control the functional units of the base station to perform the functions described below. Alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0259] At point 2705, the base station can send a SCell activation message to the UE, indicating that a SCell will also be activated at the UE in addition to the primary cell. The operation at point 2705 can be performed according to the method described herein. In some examples, aspects of the operation at point 2705 can be derived from, as referenced... Figures 15 to 18 The SCell Activation Manager is described and executed.

[0260] At 2710, the base station can send a MAC-CE to the UE to indicate one or more parameters for an aperiodic reference signal. Operation of 2710 can be performed according to the methods described herein. In some examples, aspects of the operation of 2710 can be determined by reference to... Figures 15 to 18 The temporary reference signal manager described is used to perform this. In some cases, one or more parameters include the carrier for the aperiodic reference signal, the time slot position of the aperiodic reference signal, the reference signal configuration of the aperiodic reference signal, the beam configuration for the aperiodic reference signal, or any combination thereof.

[0261] At 2715, the base station can transmit an aperiodic reference signal to the UE based on one or more identified parameters for the aperiodic reference signal. Operation 2715 can be performed according to the method described herein. In some examples, aspects of the operation of 2715 can be determined by, as referenced... Figures 15 to 18 The temporary reference signal manager described is used for execution.

[0262] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods can be combined.

[0263] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used extensively in the description, the technologies described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described technologies are applicable to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein, including future systems and radio technologies.

[0264] The information and signals described herein can be represented using any of a variety of different techniques and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0265] The various illustrative blocks and components described herein can be implemented or performed using general-purpose processors, DSPs, ASICs, CPUs, GPUs, FPGAs, or other programmable logic devices, 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 alternatively, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0266] The functionality described herein can be implemented in hardware, software executed by a processor, or any combination thereof. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, software should be broadly interpreted as instructions, instruction sets, code, code segments, program code, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, and / or functions. If implemented in software executed by a processor, the functionality can be stored as one or more instructions or code on or transmitted through a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functionality described herein can be implemented using software executed by a processor, hardware, hardwiring, or any combination of these. Features implementing the functionality can also be physically located in various locations, including being distributed such that portions of the functionality are implemented in different physical locations.

[0267] Computer-readable media include both non-transitory computer storage media and communication media, with communication media encompassing any medium that facilitates the transfer of computer programs from one place to another. Non-transitory storage media can be any available medium accessible by a general-purpose computer or a special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other non-transitory medium capable of carrying or storing desired units of program code in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs. Disks typically copy data magnetically, while optical discs use lasers to copy data optically. The combinations described above are also included within the scope of computer-readable media.

[0268] As used herein (including in the claims), the word "or" 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, such that 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 (e.g., A and B and C). Furthermore, as used herein, the phrase "based on" should not be construed 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 on" should be interpreted in the same manner as the phrase "at least partially based on".

[0269] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by a dash followed by a second reference numeral, used to differentiate between similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, without regard to the second reference numeral or other subsequent reference numerals.

[0270] This document describes exemplary configurations with reference to the accompanying drawings, but does not represent all examples that can be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," not "preferred" or "advantageous over other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques may be implemented without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0271] 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 readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: One or more memories that store processor-executable code; as well as One or more processors, coupled to the one or more memories, and individually or jointly configured to execute processor-executable code to cause the UE to perform the following operations: Receive a secondary cell activation message from the network device, indicating that a secondary cell will also be activated at the UE in addition to the primary cell; Receive downlink control information (DCI) from the network device for indicating one or more parameters for an aperiodic reference signal; The one or more parameters of the aperiodic reference signal used for cell activation measurement are identified at least in part based on the secondary cell activation message and from the DCI, wherein the one or more parameters include the carrier of the aperiodic reference signal, the time slot position of the aperiodic reference signal, the reference signal configuration of the aperiodic reference signal, the beam configuration of the aperiodic reference signal, or any combination thereof. as well as One or more characteristics of the secondary cell are measured, at least in part, based on the aperiodic reference signal.

2. The apparatus according to claim 1, wherein, The aperiodic reference signal is sent after the time gap associated with the secondary cell activation message.

3. The apparatus according to claim 2, wherein, The time intervals correspond to a first predetermined time period after the UE confirms the secondary cell activation message, a second predetermined time period after downlink control channel communication for providing downlink control information (DCI), or a third predetermined time period after the UE confirms the DCI.

4. The apparatus according to claim 1, wherein, The DCI schedules shared channel communication, which provides the secondary cell activation message and indicates one or more parameters for the aperiodic reference signal.

5. The apparatus according to claim 1, wherein, The one or more parameters used for the aperiodic reference signal are provided in the information field of the DCI, and The information field has the same format as the Channel State Information (CSI) request field sent in the DCI.

6. The apparatus according to claim 1, wherein, The DCI is a separate DCI from the scheduling DCI, which schedules the shared channel communication used to provide the secondary cell activation message.

7. The apparatus according to claim 6, wherein, The respective DCIs include additional scheduling information for communicating with the downlink shared channel of the UE, and one or more parameters for the aperiodic reference signal.

8. The apparatus according to claim 6, wherein, The separate DCIs are combined with downlink control channel communications that do not provide scheduling information for shared channel communications.

9. The apparatus according to claim 8, wherein, The one or more parameters used for the aperiodic reference signal are provided in one or more fields in the respective DCIs, which are otherwise used for the scheduling information of the shared channel communication.

10. The apparatus according to claim 1, wherein, The one or more parameters used for the aperiodic reference signal are provided in an information field having the same format as the Channel State Information (CSI) request field in the uplink grant.

11. The apparatus according to claim 10, wherein, The number of bits in the information field is configured by Radio Resource Control (RRC) signaling or determined at least in part based on the number of available Tracking Reference Signal (TRS) states.

12. The apparatus according to claim 10, wherein, The information field is mapped to one or more of the following for one or more serving cells: TRS timing or time slot, TRS resources, TRS power offset, or any combination thereof.

13. The apparatus according to claim 1, wherein, The DCI has a fallback DCI format or a non-fallback DCI format.

14. The apparatus according to claim 1, wherein, The measurement of the aperiodic reference signal is triggered by the DCI having a pre-configured DCI format.

15. The apparatus according to claim 14, wherein, The pre-configured DCI format is configured by Radio Resource Control (RRC) signaling.

16. The apparatus according to claim 1, wherein, The measurement of the aperiodic reference signal is triggered by the DCI located in a pre-configured set of DCI search spaces.

17. The apparatus according to claim 16, wherein, One or more pre-configured DCI search space sets that can contain DCIs for triggering measurements of the aperiodic reference signal are configured by Radio Resource Control (RRC) signaling.

18. An apparatus for wireless communication at a network device, comprising: One or more memories that store processor-executable code; as well as One or more processors, coupled to the one or more memories, and individually or jointly configured to execute processor-executable code to cause the network device to perform the following operations: Send a secondary cell activation message to the user equipment (UE) indicating that a secondary cell will also be activated at the UE in addition to the primary cell; The secondary cell activation message is used to identify one or more parameters of an aperiodic reference signal for the secondary cell, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof. Sending downlink control information (DCI) to the UE for indicating one or more parameters for the aperiodic reference signal; and The aperiodic reference signal is sent to the UE based at least in part on the identification.

19. The apparatus according to claim 18, wherein, The aperiodic reference signal is sent after the time gap associated with the secondary cell activation message.

20. The apparatus according to claim 19, wherein, The time intervals correspond to a first predetermined time period after the UE confirms the secondary cell activation message, a second predetermined time period after downlink control channel communication for providing downlink control information (DCI), or a third predetermined time period after the UE confirms the DCI.

21. The apparatus according to claim 18, wherein, The DCI schedules shared channel communication, which provides the secondary cell activation message and indicates one or more parameters for the aperiodic reference signal.

22. The apparatus according to claim 18, wherein, The one or more parameters used for the aperiodic reference signal are provided in the information field of the DCI, and The information field has the same format as the Channel State Information (CSI) request field sent in the DCI.

23. The apparatus according to claim 18, wherein, The DCI is a separate DCI from the scheduling DCI, which schedules the shared channel communication used to provide the secondary cell activation message.

24. The apparatus according to claim 23, wherein, The respective DCIs include additional scheduling information for communicating with the downlink shared channel of the UE, and one or more parameters for the aperiodic reference signal.

25. The apparatus according to claim 23, wherein, The separate DCIs are combined with downlink control channel communications that do not provide scheduling information for shared channel communications.

26. The apparatus according to claim 25, wherein, The one or more parameters used for the aperiodic reference signal are provided in one or more fields in the respective DCIs, which are otherwise used for the scheduling information of the shared channel communication.

27. The apparatus according to claim 18, wherein, The one or more parameters used for the aperiodic reference signal are provided in an information field having the same format as the Channel State Information (CSI) request field in the uplink grant.

28. The apparatus according to claim 27, wherein, The number of bits in the information field is configured by Radio Resource Control (RRC) signaling or determined at least in part based on the number of available Tracking Reference Signal (TRS) states.

29. The apparatus according to claim 27, wherein, The information field is mapped to one or more of the following for one or more serving cells: TRS timing or time slot, TRS resources, TRS power offset, or any combination thereof.

30. The apparatus according to claim 18, wherein, The DCI has a fallback DCI format or a non-fallback DCI format.

31. The apparatus according to claim 18, wherein, The measurement of the aperiodic reference signal is triggered by the DCI having a pre-configured DCI format.

32. The apparatus according to claim 31, wherein, The pre-configured DCI format is configured by Radio Resource Control (RRC) signaling.

33. The apparatus according to claim 18, wherein, The measurement of the aperiodic reference signal is triggered by the DCI located in a pre-configured set of DCI search spaces.

34. The apparatus according to claim 33, wherein, One or more pre-configured DCI search space sets that can contain DCIs for triggering measurements of the aperiodic reference signal are configured by Radio Resource Control (RRC) signaling.

35. A method for wireless communication at a user equipment (UE), comprising: Receive a secondary cell activation message from the network device, indicating that a secondary cell will also be activated at the UE in addition to the primary cell; Receive downlink control information (DCI) from the network device for indicating one or more parameters for an aperiodic reference signal; The one or more parameters of the aperiodic reference signal used for cell activation measurement are identified at least in part based on the secondary cell activation message and from the DCI, wherein the one or more parameters include the carrier of the aperiodic reference signal, the time slot position of the aperiodic reference signal, the reference signal configuration of the aperiodic reference signal, the beam configuration of the aperiodic reference signal, or any combination thereof. as well as One or more characteristics of the secondary cell are measured, at least in part, based on the aperiodic reference signal.

36. A method for wireless communication at a network device, comprising: Send a secondary cell activation message to the user equipment (UE) indicating that a secondary cell will also be activated at the UE in addition to the primary cell; The secondary cell activation message is used to identify one or more parameters of an aperiodic reference signal for the secondary cell, wherein the one or more parameters include a carrier for the aperiodic reference signal, a time slot position of the aperiodic reference signal, a reference signal configuration of the aperiodic reference signal, a beam configuration of the aperiodic reference signal, or any combination thereof. Sending downlink control information (DCI) to the UE for indicating one or more parameters for the aperiodic reference signal; and The aperiodic reference signal is sent to the UE based at least in part on the identification.

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