Channel State Information (CSI) Reporting Techniques for Secondary Cell (SCELL) Activation

Abstract

The present disclosure provides systems, methods, and apparatuses that support channel state information (CSI) reporting techniques for secondary cell (SCell) activation. A user equipment (UE) may receive one or more medium access control-control elements (MAC-CEs) indicating a secondary cell (SCell) activation command, an aperiodic tracking reference signal (AP-TRS) trigger, and an aperiodic channel state information (AP-CSI) reporting trigger. A network entity may signal the SCell activation command, the AP-TRS trigger, and the AP-CSI reporting trigger in the same MAC-CE or separate MAC-CEs. The UE may receive and measure the AP-TRS according to the AP-TRS triggers indicated by the one or more MAC-CEs, and may perform measurements via an aperiodic channel measurement resource (AP-CMR) and an aperiodic interference measurement resource (AP-IMR) according to the AP-CSI reporting triggers indicated by the one or more MAC-CEs. Accordingly, the UE may transmit an AP-CSI report associated with the measurements.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This patent application claims priority to U.S. Patent Application No. 18 / 049,493 by Ryu et al., entitled "CHANNEL STATE INFORMATION (CSI) REPORTING TECHNIQUES FOR SECONDARY CELL (SCELL) ACTIVATION," filed October 25, 2022, which is assigned to the assignee hereof and expressly incorporated herein by reference.

[0002] The present disclosure relates generally to wireless communications, and more particularly to channel state information (CSI) reporting techniques for secondary cell (SCell) activation. [Background technology]

[0003] 2. Description of Related Art Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasts, etc. These systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth-generation (4G) systems, such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth-generation (5G) systems, sometimes referred to as New Radio (NR) systems. These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM). A wireless multiple-access communication system may include one or more base stations (BSs) or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, also known as user equipment (UE). Summary of the Invention

[0004] The systems, methods, and devices of the present disclosure each have several inventive aspects, no single aspect of which is solely responsible for the desirable attributes disclosed herein.

[0005] One innovative aspect of the subject matter described in this disclosure may be implemented in a method of wireless communication in a user equipment (UE). The method may include receiving at least one medium access control (MAC)-control element (CE) over a first set of resources associated with a first cell, the MAC-CE activating a second cell and triggering aperiodic channel state information (CSI) reporting for the second cell. The method may further include receiving one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The method may further include transmitting an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0006] Another inventive aspect of the subject matter described in this disclosure may be implemented in a wireless communications apparatus in a UE. The apparatus may include one or more interfaces and a processing system. The apparatus may include one or more interfaces configured to obtain, via a first set of resources associated with a first cell, at least one MAC-CE that activates a second cell and triggers aperiodic CSI reporting for the second cell. The one or more interfaces may be further configured to obtain, via a second set of resources associated with the second cell in accordance with the at least one MAC-CE, one or more aperiodic reference signals. The one or more interfaces may be further configured to output aperiodic CSI reports associated with measurements of the one or more aperiodic reference signals. In some implementations, the processing system may be configured and capable of implementing the described operations of the apparatus.

[0007] Another inventive aspect of the subject matter described in this disclosure may be implemented in a wireless communications apparatus in a UE. The apparatus may include means for receiving, over a first set of resources associated with a first cell, at least one MAC-CE, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell. The apparatus may further include means for receiving, over a second set of resources associated with the second cell in accordance with the at least one MAC-CE, one or more aperiodic reference signals. The apparatus may further include means for transmitting an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0008] Another inventive aspect of the subject matter described in this disclosure may be implemented in a non-transitory computer-readable medium storing code for wireless communication in a UE. The code may include instructions executable by a processor to receive at least one MAC-CE over a first set of resources associated with a first cell, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell. The code may further include instructions executable by the processor to receive one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The code may further include instructions executable by the processor to transmit an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0009] Some implementations of the methods, apparatus, and non-transitory computer-readable media described herein may include acts, features, means, or instructions for receiving, via at least one MAC-CE in accordance with at least one MAC-CE that activates the second cell, a first instruction to trigger aperiodic tracking reference signal (TRS) measurements for the second cell and a second instruction to trigger aperiodic CSI reporting for the second cell, wherein the at least one MAC-CE is a single MAC-CE and receives one or more aperiodic reference signals via a second set of resources in accordance with the second instruction.

[0010] Some implementations of the methods, apparatus, and non-transitory computer-readable media described herein may include an operation, feature, means, or instruction for receiving a first MAC-CE, the first MAC-CE activating a second cell and triggering aperiodic TRS measurements for the second cell, and an operation, feature, means, or instruction for receiving a second MAC-CE triggering aperiodic CSI reporting for the second cell, wherein receiving one or more aperiodic reference signals is pursuant to the second MAC-CE.

[0011] Another inventive aspect of the subject matter described in this disclosure may be implemented in a method of wireless communication in a network entity. The method may include transmitting at least one MAC-CE over a first set of resources associated with a first cell, the MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell. The method may further include transmitting one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The method may further include receiving an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0012] Another inventive aspect of the subject matter described in this disclosure may be implemented in a wireless communication apparatus in a network entity. The apparatus may include one or more interfaces and a processing system. The apparatus may include one or more interfaces configured to output at least one MAC-CE over a first set of resources associated with a first cell, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell. The one or more interfaces may be further configured to output one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The one or more interfaces may be further configured to obtain aperiodic CSI reports associated with measurements of the one or more aperiodic reference signals. In some implementations, the processing system may be configured and capable of implementing the described operations of the apparatus.

[0013] Another inventive aspect of the subject matter described in this disclosure may be implemented in a wireless communication apparatus in a network entity. The apparatus may include means for transmitting at least one MAC-CE over a first set of resources associated with a first cell, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell. The apparatus may further include means for transmitting one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The apparatus may further include means for receiving an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0014] Another inventive aspect of the subject matter described in this disclosure may be implemented in a non-transitory computer-readable medium storing code for wireless communication in a network entity. The code may include instructions executable by a processor to transmit at least one MAC-CE over a first set of resources associated with a first cell, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell. The code may further include instructions executable by a processor to transmit one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The code may further include instructions executable by a processor to receive an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0015] Some implementations of the methods, apparatus, and non-transitory computer-readable media described herein may further include an operation, feature, means, or instruction for transmitting, via control signaling, an indication of a plurality of aperiodic channel measurement resources (CMRs) and a plurality of aperiodic interference measurement resources (IMRs) associated with the second cell, wherein the set of aperiodic CMRs and the set of aperiodic IMRs include the second set of resources.

[0016] Some implementations of the methods, apparatus, and non-transitory computer-readable media described herein may further include acts, features, means, or instructions for transmitting at least one aperiodic TRS over a third set of resources associated with the second cell, wherein the at least one MAC-CE further triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE triggering the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

[0017] The details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, drawings, and claims. It should be noted that the relative dimensions of the following figures may not be drawn to scale. [Brief explanation of the drawings]

[0018] [Figure 1] 1 illustrates an example wireless communication system that supports channel state information (CSI) reporting techniques for secondary cell (SCell) activation. [Figure 2] 1 illustrates an example signaling diagram supporting a CSI reporting technique for SCell activation. [Figure 3] 1 illustrates an example resource diagram supporting a CSI reporting technique for SCell activation. [Figure 4] 1 illustrates an example process flow supporting a CSI reporting technique for SCell activation. [Figure 5] 1 illustrates a block diagram of an example device that supports CSI reporting techniques for SCell activation. [Figure 6] 1 illustrates a block diagram of an example device that supports CSI reporting techniques for SCell activation. [Figure 7] 1 shows a flowchart illustrating an example method for supporting CSI reporting techniques for SCell activation. [Figure 8] 1 shows a flowchart illustrating an example method for supporting CSI reporting techniques for SCell activation.

[0019] Like reference numbers and designations in the various drawings indicate like elements. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following description is directed to several implementations for the purposes of describing the inventive aspects of the present disclosure, however, those skilled in the art will readily recognize that the teachings herein can be applied in many different ways.Described implementations may include any of the Institute of Electrical and Electronics Engineers (IEEE) 16.11 standards, any of the IEEE 802.11 standards, the Bluetooth standard, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Global System for Mobile communications (GSM), GSM / General Packet Radio Service (GPRS), Enhanced Data GSM Environment (EDGE), Terrestrial Trunked Radio (TETRA), Wideband-CDMA (W-CDMA), Evolution Data Optimized (EV-DO), 1xEV-DO, EV-DO Rev A, EV-DO Rev B, High Speed ​​Packet Access (HSPA), High Speed ​​Downlink Packet Access (HSDPA), High Speed ​​Uplink Packet Access (HSP), High Speed ​​... The present invention may be implemented in any device, system, or network capable of transmitting and receiving radio frequency (RF) signals from LTE, Evolved High Speed ​​Packet Access (HSPA+), Long Term Evolution (LTE), AMPS, or other known signals used to communicate within wireless, cellular, or Internet of Things (IoT) networks, such as systems utilizing third generation (3G), fourth generation (4G), fifth generation (5G), sixth generation (6G) technologies, or further implementations thereof.

[0021] In some wireless communication systems that support carrier aggregation, a network entity may communicate with a user equipment (UE) using multiple aggregated carrier frequencies, sometimes referred to as cells or component carriers (CCs). One of the cells may be designated as a primary cell (PCell), while other cells may be designated as secondary cells (SCells). Using an SCell may enable the network entity and the UE to communicate over a larger effective bandwidth compared to a single-carrier communication scheme, which may result in higher achievable throughput and greater spectral diversity. The network entity may activate an SCell for a UE by sending a medium access control (MAC)-control element (CE) indicating an SCell activation command. In some scenarios, the MAC-CE may also trigger one or more aperiodic tracking reference signals (AP-TRSs) that the UE may use for one or more of automatic gain control (AGC), frequency tracking loop (FTL), and time tracking loop (TTL) operations in the UE (to accelerate downlink loop initialization for the SCell).

[0022] Once a SCell is activated for a UE, a network entity may use the SCell to communicate with the UE. However, in some scenarios, the network entity may not be able to schedule downlink communications on the SCell until it receives a channel state information (CSI) report from the UE. To generate the CSI report, the UE may receive and measure one or more CSI reference signals (CSI-RSs), synchronization signal blocks (SSBs), or other reference signals via a set of one or more channel measurement resources (CMRs) and one or more interference measurement resources (IMRs). For example, if there is a delay between receiving an SCell activation command and the next available set of CMRs and IMRs, the UE may not be able to use the SCell to complete the SCell activation process and receive downlink communications from the network entity for the duration of the delay.

[0023] Various aspects of the present disclosure support techniques for reducing the latency of an SCell activation procedure by allowing a network entity to jointly transmit an aperiodic CSI (AP-CSI) reporting trigger with an SCell activation command. In some implementations, a network entity may transmit a single MAC-CE including the AP-CSI reporting trigger, the SCell activation command, and an AP-TRS trigger for the UE. In some other implementations, the network entity may include the AP-CSI reporting trigger in a separate MAC-CE. The AP-CSI reporting trigger may indicate at least one aperiodic CMR / IMR (AP-CMR / IMR) pair to be used for CSI measurements associated with the SCell. In some implementations, the AP-CSI reporting trigger may indicate at least one AP-CMR / IMR pair for a set of AP-TRS resources indicated by the AP-TRS trigger. For example, the AP-CMR / IMR pair may be identified using a slot offset from the AP-TRS resource.

[0024] In some implementations, the AP-CSI reporting trigger may also indicate a physical uplink shared channel (PUSCH) resource that the UE will use for transmitting the AP-CSI report. Thus, following receiving the SCell activation command, the AP-TRS trigger, and the AP-CSI reporting trigger (e.g., on the same MAC-CE or separate MAC-CEs), the UE may receive and measure one or more AP-TRSs, receive and measure one or more CSI-RSs via at least one AP-CMR / IMR pair, generate an AP-CSI report associated with the at least one AP-CMR / IMR pair, and transmit the AP-CSI report to a network entity using the PUSCH resource indicated by the AP-CSI reporting trigger. In some implementations, the network entity may configure a time offset (e.g., a number of slots) between the one or more AP-TRSs and the at least one AP-CMR / IMR pair according to the UE's downlink synchronization capability, the network entity's downlink resource availability, or both.

[0025] Particular implementations of the subject matter described in this disclosure may be implemented to achieve one or more of the following potential advantages. For example, the techniques and signaling mechanisms described herein may reduce SCell activation latency by enabling network entities to jointly activate an SCell and trigger AP-CSI reporting for a UE. More specifically, the network entity may transmit at least one MAC-CE indicating an activation command for the SCell and at least one AP-CMR / IMR pair to be used by the UE for AP-CSI measurements associated with the SCell, thereby enabling the UE to generate and report CSI to the network entity with reduced latency. As a result, the UE may activate the SCell in a relatively shorter time span, thereby enabling the UE and the network entity to achieve higher throughput levels by using the activated SCell for subsequent communications. According to such lower latency and higher throughput levels, the UE and the network entity may experience greater multiple connectivity, higher data rates, greater spectral efficiency, and greater system capacity, among other benefits.

[0026] 1 shows an example wireless communication system 100 that supports CSI reporting techniques for SCell activation. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some implementations, the wireless communication system 100 may be a network operating in accordance with a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or other systems and radio technologies, including future systems and radio technologies not explicitly mentioned herein.

[0027] The network entities 105 may be distributed throughout a geographic area to form the wireless communication system 100 and may include devices of different forms or with different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, among other nomenclature. In some implementations, the network entities 105 and the UEs 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, the network entities 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UEs 115 and the network entities 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the network entities 105 and the UEs 115 may support communication of signals via one or more radio access technologies (RATs).

[0028] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile or both at different times. The UEs 115 may be devices of different types or with different capabilities. Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be capable of supporting communication with various types of devices, such as other UEs 115 or network entities 105, as shown in FIG. 1.

[0029] As described herein, a node of the wireless communication system 100, which may be referred to as a network node or a wireless node, may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another appropriate processing entity configured to perform any of the techniques described herein. For example, a node may be a UE 115. As another example, a node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In still other aspects of this example, the first node, the second node, and the third node may vary relative to these examples. Similarly, references to a UE 115, a network entity 105, an apparatus, a device, a computing system, etc. may include disclosure of the UE 115, the network entity 105, the apparatus, the device, the computing system, etc. as being nodes. For example, disclosure that a UE 115 is configured to receive information from a network entity 105 also discloses that a first node is configured to receive information from a second node.

[0030] In some implementations, the network entities 105 may communicate with the core network 130, with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to an S1, N2, N3, or other interface protocol). In some implementations, the network entities 105 may communicate with each other either via the backhaul communication links 120 (e.g., according to an X2, Xn, or other interface protocol), directly (e.g., directly between the network entities 105), or indirectly (e.g., via the core network 130). In some implementations, the network entities 105 may communicate with each other via midhaul communication links 162 (e.g., according to a midhaul interface protocol) or fronthaul communication links 168 (e.g., according to a fronthaul interface protocol), or any combination thereof. The backhaul communication link 120, the midhaul communication link 162, or the fronthaul communication link 168 may be or include, among other examples or various combinations thereof, one or more wired links (electrical links, optical fiber links, etc.), one or more wireless links (radio links, wireless optical links, etc.). The UE 115 may communicate with the core network 130 via the communication link 155.

[0031] One or more of the network entities 105 described herein may include a base station (BS) 140 (such as a base transceiver station, radio BS, NR BS, access point, radio transceiver, NodeB, eNodeB (eNB), next generation NodeB or giga NodeB (all sometimes referred to as gNB), 5G NB, next-generation eNB (ng-eNB), Home NodeB, Home eNodeB, or other suitable terminology) or may be referred to as a base station 140. In some implementations, the network entities 105 (such as the BS 140) may be implemented in a converged (monolithic, standalone, etc.) BS architecture that may be configured to utilize protocol stacks that are physically or logically integrated within a single network entity 105 (such as a single RAN node such as the BS 140).

[0032] In some implementations, the network entities 105 may be implemented in a disaggregated architecture (e.g., disaggregated BS architecture, disaggregated RAN architecture), which may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN Intelligent Controller (RIC) 175 (such as a Near-Real Time RIC (Near-RT RIC), a Non-Real Time RIC (Non-RT RIC), etc.), a Service Management and Orchestration (SMO) 180 system, or any combination thereof.

[0033] The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission reception point (TRP). One or more components of the network entity 105 in a disaggregated RAN architecture may be collocated, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some implementations, one or more network entities 105 in a disaggregated RAN architecture may be implemented as a virtual unit (e.g., a virtual CU (VCU), a virtual DU (VDU), a virtual RU (VRU), etc.).

[0034] The division of functionality among the CU 160, the DU 165, and the RU 170 is flexible and may support different functionality depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are executed in the CU 160, the DU 165, or the RU 170. For example, a functional division of a protocol stack may be adopted between the CU 160 and the DU 165 such that the CU 160 can support one or more layers of the protocol stack and the DU 165 can support one or more different layers of the protocol stack. In some implementations, the CU 160 may host upper protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functionality and signaling (e.g., Radio Resource Control (RRC), service data adaptation protocol (SDAP), Packet Data Convergence Protocol (PDCP)).

[0035] The CU 160 may be connected to one or more DUs 165 or RUs 170, which may host lower protocol layers such as Layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, MAC layer) functionality and signaling, each of which may be at least partially controlled by the CU 160. Additionally or alternatively, a functional division of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack.

[0036] The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some implementations, the functional division between the CU 160 and the DU 165 or between the DU 165 and the RU 170 may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of the CU 160, the DU 165, or the RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170). The CU 160 may be further functionally divided into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions.

[0037] The CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and the DUs 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interfaces). In some implementations, the midhaul communication links 162 or the fronthaul communication links 168 may be implemented according to interfaces (e.g., channels) between layers of protocol stacks supported by the respective network entities 105 communicating via such communication links.

[0038] In a wireless communication system (such as the wireless communication system 100), infrastructure and spectrum resources for radio access can supplement wired backhaul connections to support wireless backhaul link capabilities and provide an IAB network architecture (such as the core network 130). In some implementations, in an IAB network, one or more network entities 105 (such as the IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors.

[0039] One or more DUs 165 or one or more RUs 170 may be partially controlled by one or more CUs 160 associated with a donor network entity 105 (e.g., donor BS 140). One or more donor network entities 105 (e.g., IAB donors) can communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access links and backhaul links (e.g., backhaul communication links 120). An IAB node 104 may include an IAB mobile termination (IAB-MT) that is controlled (e.g., scheduled) by the associated IAB donor's DU 165. The IAB-MT may include a separate set of antennas for relaying communications with UEs 115 or may share the same antennas (e.g., RUs 170) of the IAB node 104 used for access via the IAB node's DU 165 (e.g., referred to as a virtual IAB-MT (VIaB-MT)).

[0040] In some implementations, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB nodes 104, UEs 115) in the relay chain or configuration of the access network (e.g., downstream). In such implementations, one or more components of the disaggregated RAN architecture (e.g., one or more IAB nodes 104 or components of an IAB node 104) may be configured to operate in accordance with the techniques described herein.

[0041] In implementations of the techniques described herein applied in the context of a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support the CSI reporting techniques for SCell activation described herein. For example, some operations described as being performed by the UE 115 or a network entity 105 (such as the BS 140) may additionally or alternatively be performed by one or more components of the disaggregated RAN architecture (such as the IAB node 104, the DU 165, the CU 160, the RU 170, the RIC 175, the SMO 180, etc.).

[0042] The UE 115 may include or be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, and a “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. The UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some implementations, the UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various items such as an appliance, a vehicle, a meter, among other examples.

[0043] The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may act as relays, as shown in FIG. 1, as well as network entities 105 and network equipment, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay BSs, among various examples.

[0044] The UE 115 and the network entity 105 may wirelessly communicate with each other over one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier used for the communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth portion (BWP)) operated according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR, etc.). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling to coordinate operation on the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation.

[0045] The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communication between the network entity 105 and another device may refer to communication between the device and any part (entity, sub-entity, etc.) of the network entity 105. For example, when referring to the network entity 105, the terms "transmit," "receive," or "communicate" may refer to any part of the network entity 105 (e.g., BS 140, CU 160, DU 165, RU 170, etc.) of the RAN that communicates with another device (e.g., directly or via one or more other network entities 105).

[0046] In some implementations, such as carrier aggregation configurations, a carrier may also have acquisition or control signaling to coordinate operation with other carriers. A carrier may be associated with a frequency channel (such as an evolved universal mobile telecommunication system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and can be identified according to a channel raster for discovery by the UE 115. A carrier may be operated in a standalone mode, where initial acquisition and connection may be made by the UE 115 over the carrier, or the carrier may be operated in a non-standalone mode, where connection is anchored using a different carrier (such as the same or different radio access technology).

[0047] The communication links 125 shown in the wireless communication system 100 may include, among other transmission configurations, downlink transmissions (e.g., forward link transmissions) from the network entity 105 to the UE 115, uplink transmissions (e.g., return link transmissions) from the UE 115 to the network entity 105, or both. A carrier may carry downlink or uplink communications (e.g., in an FDD mode) or may be configured to carry downlink and uplink communications (e.g., in a TDD mode).

[0048] A carrier may be associated with a particular bandwidth of the RF spectrum, and in some implementations, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of a set of bandwidths (1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier of a particular radio access technology. Devices (e.g., network entities 105, UEs 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communication using a particular carrier bandwidth or may be configurable to support communication using one of the set of carrier bandwidths. In some implementations, the wireless communication system 100 may include network entities 105 or UEs 115 that support simultaneous communication using carriers associated with multiple carrier bandwidths. In some implementations, each served UE 115 may be configured to operate using a portion (e.g., a sub-band, BWP) or all of the carrier bandwidth.

[0049] A signal waveform transmitted over a carrier may be composed of multiple subcarriers (e.g., using a multi-carrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and the subcarrier spacing may have an inverse proportional relationship. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), such that a relatively large number of resource elements (e.g., during a transmission duration) and a relatively high order of the modulation scheme may correspond to a relatively higher communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), where the use of multiple spatial resources may further increase the data rate or data integrity for communication with the UE 115.

[0050] One or more numerologies for a carrier may be supported, and a numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs with the same or different numerologies. In some implementations, a UE 115 may be configured with multiple BWPs. In some implementations, a single BWP for a carrier may be active at a given time, and communication for the UE 115 may be limited to one or more active BWPs.

[0051] The time interval for the network entity 105 or the UE 115 may be, in some implementations, T s =1 / (Δf max N f ) seconds, where Δf max may represent the supported subcarrier spacing, and N fmay represent the supported discrete Fourier transform (DFT) sizes. The communication resource time intervals may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., in the range 0 to 1023).

[0052] Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some implementations, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a number of slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on the subcarrier spacing. Each slot may include a number of symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). In some wireless communications systems 100, a slot may be further divided into multiple minislots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (N f The duration of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0053] A subframe, slot, minislot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some implementations, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0054] Physical channels may be multiplexed for communication using carriers according to various techniques. Physical control channels and physical data channels may be multiplexed for signaling over downlink carriers using, for example, one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a set of symbol periods and may extend across the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESET) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search the control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for sending control information to multiple UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0055] The network entity 105 may provide communication coverage via one or more cells, e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof. The term “cell” may refer to a logical communication entity used for communication with the network entity 105 (e.g., using a carrier) and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) for distinguishing neighboring cells. In some implementations, a cell may also refer to a coverage area 110 or a portion (e.g., a sector) of a coverage area 110 in which the logical communication entity operates. Such a cell may range from a smaller area (e.g., a structure, a subset of a structure, etc.) to a larger area, depending on various factors such as the capabilities of the network entity 105. For example, a cell may be or include a building, a subset of a building, or an outside space between or overlapping with the coverage area 110, among other examples.

[0056] A macro cell generally covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs 115 that subscribe to service with a network provider that supports the macro cell. A small cell may be associated with a lower-power network entity 105 (e.g., a lower-power BS 140) compared to a macro cell, and the small cell may operate using the same or a different frequency band (e.g., licensed, unlicensed, etc.) as the macro cell. A small cell may provide unrestricted access to UEs 115 that subscribe to service with the network provider, or may provide restricted access to UEs 115 that have an association with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in their homes or offices). A network entity 105 may support one or more cells and may also support communication via one or more cells using one or more component carriers.

[0057] In some implementations, a carrier may support multiple cells, and different cells may be configured according to different protocol types (MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB), etc.) that may provide access to different types of devices.

[0058] In some implementations, the network entities 105 (e.g., BSs 140, RUs 170) may be mobile and thus may provide communication coverage for moving coverage areas 110. In some implementations, different coverage areas 110 associated with different technologies may overlap, although the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include a heterogeneous network, for example, where different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0059] The wireless communication system 100 may be configured to support ultra-reliable or low-latency communications, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communications (URLLC). The UE 115 may be designed to support ultra-reliable, low-latency, or critical functionality. Ultra-reliable communications may include private or group communications and may be supported by one or more services, such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functionality may include service prioritization, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0060] In some implementations, the UEs 115 may be configured to support direct communication with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some implementations, one or more UEs 115 of a group performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., BS 140, RU 170), which may support aspects of such D2D communication configured (e.g., scheduled) by the network entity 105. In some implementations, one or more UEs 115 of such a group may be outside the coverage area 110 of the network entity 105 or may not be able to or configured to receive transmissions from the network entity 105. In some implementations, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, where each UE 115 transmits to each of the other UEs 115 in the group. In some implementations, the network entity 105 may facilitate scheduling of resources for D2D communication. In some other examples, D2D communication may be performed between UEs 115 without the involvement of the network entity 105.

[0061] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5G core, 5GC), which may include at least one control plane entity (such as a mobility management entity (MME), an access and mobility management function (AMF)) that manages access and mobility, and at least one user plane entity (such as a serving gateway (S-GW), a Packet Data Network (PDN) gateway (P-GW), or a user plane function (UPF)) that routes packets or interconnects to external networks. The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for UEs 115 served by network entities 105 (e.g., BS 140) associated with the core network 130. User IP packets may be forwarded through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may connect to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, intranet(s), IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0062] The wireless communication system 100 may operate using one or more frequency bands, which may range from 300 megahertz (MHz) to 300 gigahertz (GHz). The 300 MHz to 3 GHz region is commonly known as the ultra-high frequency (UHF) region or decimeter band because wavelengths range in length from approximately 1 decimeter to 1 meter. Although UHF waves may be blocked or redirected by buildings and environmental features, sometimes referred to as clusters, the waves can penetrate structures sufficiently for a macrocell to provide service to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to communications using smaller frequencies and longer waves in the shortwave (high frequency (HF)) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0063] The wireless communication system 100 may use both licensed and unlicensed RF spectrum bands. For example, the wireless communication system 100 may employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology using unlicensed bands such as the 5 GHz industrial, scientific, and medical (ISM) band. While operating using unlicensed RF spectrum bands, devices such as the network entity 105 and the UE 115 may employ carrier sensing for collision detection and avoidance. In some implementations, operations using unlicensed bands may be in accordance with a carrier aggregation configuration in conjunction with component carriers operating using licensed bands (e.g., LAA). Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0064] The network entity 105 (e.g., BS 140, RU 170) or the UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the network entity 105 or the UE 115 may be located in one or more antenna arrays or antenna panels that may support MIMO operations or transmit or receive beamforming. For example, one or more BS antennas or antenna arrays may be collocated in an antenna assembly such as an antenna tower. In some implementations, the antennas or antenna arrays associated with the network entity 105 may be located in various geographic locations. The network entity 105 may include an antenna array having a set of rows and columns of antenna ports that the network entity 105 can use to support beamforming of communications with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted through the antenna ports.

[0065] Beamforming, sometimes referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting or receiving device (e.g., network entity 105, UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming may be achieved by combining signals communicated through antenna elements of an antenna array such that some signals propagating along a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjusting signals communicated through antenna elements may include the transmitting or receiving device applying an amplitude offset, a phase offset, or both to signals carried through antenna elements associated with the device. The adjustment associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., relative to the antenna array of the transmitting or receiving device, or to some other orientation).

[0066] In some implementations, transmission by a device (e.g., by the network entity 105 or the UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a composite beam for transmission (e.g., from the network entity 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across the system bandwidth or one or more subbands. The network entity 105 may transmit a reference signal (e.g., a cell-specific reference signal (CRS), CSI-RS, etc.) that may be precoded or ampliconed. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook, etc.). Although these techniques are described with reference to signals transmitted along one or more directions by a network entity 105 (e.g., BS 140, RU 170), the UE 115 may employ similar techniques to transmit a signal multiple times along different directions (e.g., to identify a beam direction for subsequent transmission or reception by the UE 115) or to transmit a signal along a single direction (e.g., to transmit data to a receiving device).

[0067] A receiving device (e.g., UE 115) may perform receiving operations according to multiple receiving configurations (e.g., directional listening) when receiving various signals from a receiving device (e.g., network entity 105), such as a synchronization signal, a reference signal, a beam selection signal, or other control signals. For example, a receiving device may perform receiving according to multiple receiving directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as “listening” according to different receiving configurations or receiving directions. In some implementations, a receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). A single receiving configuration may be aligned along a beam direction determined according to listening through different receiving configuration directions (such as a beam direction determined to have the greatest signal strength, the greatest signal-to-noise ratio (SNR), or acceptable signal quality according to listening through multiple beam directions).

[0068] The wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly for communications over logical channels. The MAC layer may perform priority handling and multiplexing of logical channels onto transport channels. The MAC layer may also implement error detection, error correction, or both to support retransmissions and improve link efficiency. In the control plane, the RRC layer may provide establishment, configuration, and maintenance of the RRC connection between the UE 115 and the network entity 105 or the core network 130 supporting radio bearers for user plane data. The PHY layer may map transport channels to physical channels.

[0069] Retransmission protocols such as hybrid automatic repeat request (HARQ) may also provide performance gains. HARQ protocols may support various HARQ signaling between transmitting and receiving wireless communication devices, as well as signaling between the PHY and MAC layers, to improve retransmission operations in the wireless communication system 100. HARQ uses a combination of error detection and error correction. For example, an HARQ transmission may include error check bits that are added to the data to be transmitted using an error detection (ED) code, such as a cyclic redundancy check (CRC). The error check bits may be used by a receiving device to determine whether it properly decoded a received HARQ transmission. In some implementations, the original data (information bits) to be transmitted may be coded with a forward error correction (FEC) code, such as using a low-density parity check (LDPC) coding scheme that systematically codes the information bits to generate parity bits. The transmitting device may transmit both the original information bits as well as the parity bits to the receiving device in the HARQ transmission. The receiving device may be able to use the parity bits to correct errors in the information bits and thus avoid retransmissions.

[0070] Implementing a HARQ protocol in the wireless communication system 100 may improve the reliability of data communicated from a transmitting device to a receiving device. The HARQ protocol may support the establishment of a HARQ session between two devices. Once the HARQ session is established, if the receiving device is unable to properly decode (and correct errors in) a first HARQ transmission received from the transmitting device, the receiving device may transmit a HARQ feedback message (such as a negative acknowledgment (NACK)) to the transmitting device indicating that at least a portion of the first HARQ transmission was not properly decoded. Such a HARQ feedback message may differ from the traditional Block ACK feedback message type associated with regular ARQ. In response to receiving the HARQ feedback message, the transmitting device may transmit a second HARQ transmission to the receiving device to communicate at least a portion that further assists the receiving device in decoding the first HARQ transmission. For example, the transmitting device may include some or all of the original information bits, some or all of the original parity bits, as well as other different parity bits in the second HARQ transmission. The combined HARQ transmission may be processed for decoding and error correction such that a complete signal associated with the HARQ transmission may be obtained.

[0071] In some implementations, a receiving device may be enabled to control whether to continue the HARQ process or revert to a non-HARQ retransmission scheme (such as an ARQ protocol). Such switching may reduce feedback overhead and increase flexibility for retransmissions by allowing devices to dynamically switch between ARQ and HARQ protocols during a frame exchange. Some implementations may also allow communications employing ARQ to be multiplexed with communications employing HARQ.

[0072] The wireless communication system 100 may support fast SCell activation using AP-TRS, which may be triggered by the MAC-CE activating the SCell. The AP-TRS may be used to accelerate downlink loop initialization of the UE 115 on the SCell according to one or more coarse or fine AGC, FTL, and TTL operations. In some aspects, a network entity may schedule downlink data on the SCell according to CSI feedback received from the UE 115. However, when periodic CSI reporting is configured for the SCell to be activated, scheduling of the downlink data may be delayed because the UE 115 may have to wait until the next available set of CMRs and IMRs to perform CSI measurements.

[0073] In some implementations, a UE 115 may receive at least one MAC-CE via a set of physical downlink shared channel (PDSCH) resources associated with a first cell to activate a second cell (different from the first cell) and trigger an AP-CSI report for the second cell. The UE 115 may receive one or more aperiodic reference signals (such as one or more aperiodic CSI-RSs or one or more SSBs) via at least one AP-CMR / IMR pair associated with the second cell according to the at least one MAC-CE. Thus, the UE 115 may generate and transmit an AP-CSI report associated with measurements of the one or more aperiodic reference signals received via the at least one AP-CMR / IMR pair. This may allow the UE 115 to activate the second cell and enable downlink data scheduling on the second cell within a relatively short time span, thereby enabling the UE 115 and the network entity 105 to achieve higher throughput levels by using the second cell for subsequent communications.

[0074] 2 shows an example signaling diagram 200 supporting a CSI reporting technique for SCell activation. The signaling diagram 200 may implement or be implemented by aspects of the wireless communication system 100. For example, the signaling diagram 200 includes a UE 115-a, which may be an example of one or more aspects of a UE 115 as described herein, including with reference to FIG. 1. The signaling diagram 200 also includes a network entity 105-a, which may be an example of one or more aspects of a network entity 105 as described herein, including with reference to FIG. 1. The UE 115-a and the network entity 105-a may communicate within a coverage area 110-a, which may be an example of one or more aspects of a coverage area 110 as described herein, including with reference to FIG. 1. In signaling diagram 200, network entity 105-a may trigger AP-CSI reporting for UE 115-a during the SCell activation process, which may enable UE 115-a to report CSI with greater efficiency and reduced latency, among other benefits.

[0075] 2, the UE 115-a may transmit capability information 205 to the network entity 105-a. The capability information 205 may indicate a slot timing value associated with the downlink synchronization capability of the UE 115-a, such as a threshold number of slots between receiving the AP-TRS 215 and completing the initial downlink synchronization process at the UE 115-a. The slot timing value may indicate a maximum time (T) for the UE 115-a to complete downlink synchronization according to the AP-TRS 215. sync,max In other words, the UE 115-a may be a UE that is connected to the set {0, 1, 2, ...T sync,max}. For example, if the UE 115-a indicates a slot timing value of 0, the network entity 105-a may schedule the AP-TRS 215 and the AP-CMR / IMR pair 220 in the same slot. In a further example, the network entity 105-a may schedule the AP-CMR / IMR pair 220 in the next slot after the AP-TRS 215 if the UE 115-a indicates a slot timing value of 1, in the second slot after the AP-TRS 215 if the UE 115-a indicates a slot timing value of 2, and so on. Additionally or alternatively, the network entity 105-a may schedule the AP-CMR / IMR pair 220 according to the downlink resource availability of the network entity 105-a. For example, the network entity 105-a may use or interpret the slot timing value indicated by the UE 115-a via the capability information 205 as the minimum number of slots between the AP-TRS 215 and the AP-CMR / IMR pair 220, and may select, identify, confirm, or determine which slots to actually schedule the AP-CMR / IMR pair 220 in according to downlink resource availability at the network entity 105-a.

[0076] The network entity 105-a may send one or more MAC-CEs 210 to the UE 115-a, and in some implementations, the one or more MAC-CEs 210 may indicate an activation command for the SCell, an AP-TRS trigger, and an AP-CSI reporting trigger. The AP-TRS trigger may indicate a first set of time and frequency resource locations corresponding to the AP-TRS 215, and the AP-CSI reporting trigger may indicate a second set of time and frequency resource locations corresponding to the AP-CMR / IMR pair 220. In some implementations, the network entity 105-a may indicate the second set of time and frequency resource locations relative to the first set of time and frequency resources using, for example, a slot offset. In some aspects, the network entity 105-a may set the slot offset according to a slot timing value associated with the downlink synchronization capability of the UE 115-a and downlink resource availability at the network entity 105-a.

[0077] In some implementations, one or more MAC-CEs 210 (that trigger AP-CSI reporting for the UE 115-a during SCell activation) may include an uplink grant 230 indicating a set of PUSCH resources that the UE 115-a should use to transmit the AP-CSI report 225. In some aspects, the uplink grant 230 may include a set of bits (e.g., a total of 27 bits) partitioned into a frequency hopping flag field (which may be a 1-bit field), a PUSCH frequency resource field (which may be a 14-bit field), a PUSCH time resource field (which may be a 4-bit field), a modulation and coding scheme (MCS) field (which may be a 4-bit field), a PUSCH transmission power control (TPC) field (which may be a 3-bit field), and a CSI request field (which may be a 1-bit field). The uplink grant 230 may facilitate PUSCH scheduling for the AP-CSI reporting. In some aspects, the format of the uplink grant 230 may be similar to the format of the uplink grant included in msg2 of the random access procedure.

[0078] The network entity 105-a may use a time offset (such as a K2 offset) to indicate the PUSCH resources allocated by the uplink grant 230 and may define the time offset relative to one of various reference points associated with SCell activation. In some implementations, the time offset may be defined relative to the location of the AP-CMR / IMR pair 220 (such as a slot associated with the AP-CMR / IMR pair 220). In some other implementations, the time offset may be defined relative to a slot (which may be denoted as slot n+k+1) that is 3 milliseconds after the UE 115-a transmits HARQ-ACK feedback for one or more PDSCH transmissions carrying one or more MAC-CEs 210. For example, for a timing advance command received in an uplink slot (which may be denoted as uplink slot n), a transmission other than a PUSCH transmission scheduled by a random access response (RAR) uplink grant or a fallback RAR uplink grant, and a PUSCH transmission with HARQ-ACK feedback information associated with a successful RAR, a corresponding adjustment of the uplink transmission timing may be applied starting from the start of uplink slot n+k+1, where k may be defined according to Equation 1.

[0079]

number

[0080] In Equation 1, N T,1 may be the duration of N1 symbols (in milliseconds) corresponding to the PDSCH processing time for the UE processing capability when additional PDSCH demodulation reference signals (DMRS) are configured, and N T,2 may be the duration of N symbols (in milliseconds), corresponding to the PUSCH preparation time for the UE processing capability, and N TA,maxmay be the maximum timing advance value (in milliseconds) that may be provided by the 12-bit TA command field,

[0081]

number

[0082] The UE 115-a may receive an AP-TRS 215 from the network entity 105-a in accordance with the AP-TRS triggers indicated by one or more MAC-CEs 210 and may use the AP-TRS 215 to perform AGC, FTL, TTL, and other downlink loop initialization processes for the SCell indicated by the SCell activation command. The UE 115-a may receive one or more reference signals via the AP-CMR / IMR pair 220 in accordance with the AP-CSI reporting triggers indicated by one or more MAC-CEs 210 and may generate an AP-CSI report 225 in accordance with measurements of the AP-CMR / IMR pair 220. The UE 115-a may transmit the AP-CSI report 225 using the PUSCH resource indicated by the uplink grant 230, and the network entity 105-a may activate the SCell and start scheduling downlink traffic for the UE 115-a on the activated SCell in accordance with receiving the AP-CSI report 225 from the UE 115-a.

[0083] 3 shows an example resource diagram 300 supporting a CSI reporting technique for SCell activation. The resource diagram 300 may implement or be implemented by aspects of the wireless communication system 100 or the signaling diagram 200. For example, the resource diagram 300 may be implemented for communication between the UE 115 and the network entity 105. The UE 115 may be an example of the UE 115 or 115-a as shown by and described with reference to FIGS. 1 and 2. The network entity 105 may be an example of the network entity 105 or 105-a as shown by and described with reference to FIGS. 1 and 2. The resource diagram 300 includes a carrier 305-a (e.g., an SCell downlink carrier), a carrier 305-b (e.g., a PCell downlink carrier), and a carrier 305-c (e.g., a PCell uplink carrier). In resource diagram 300, UE 115 may receive an SCell activation command 310 and an AP-CSI reporting trigger 335 from network entity 105 via one or more MAC-CEs, such as via one or more MAC-CEs 210 as shown by and described with reference to FIG. 2.

[0084] As described herein, including with reference to Figures 1 and 2, a PDSCH transmission with MAC-CE for SCell activation may also trigger an AP-CSI report for the SCell. In some implementations, an AP-CMR / IMR pair 325 (which the UE 115 may use to perform CSI measurements associated with the SCell) may be scheduled in the same slot as the AP-TRS 320 or a subsequent slot, where the AP-CMR / IMR pair 325 may be an example of the AP-CMR / IMR pair 220 as shown by and described with reference to Figure 2, and the AP-TRS 320 may be an example of the AP-TRS 215 as shown by and described with reference to Figure 2. The UE 115 may measure CSI using the AP-CMR / IMR pair 325 and transmit a corresponding AP-CSI report 330 on a set of PUSCH resources indicated by an AP-CSI reporting trigger 335. Although shown as being transmitted over a PCell, the UE 115 may transmit the AP-CSI report 330 over the activated SCell or another SCell (such as another, previously activated SCell) supported by the UE 115 and the network entity 105. The network entity 105 may then begin scheduling PDSCH traffic for the UE 115 on the activated SCell.

[0085] In some implementations, the network entity 105 may transmit the SCell activation command 310, the AP-TRS trigger, and the AP-CSI reporting trigger 335 via an integrated MAC-CE. In some other implementations, the network entity 105 may transmit a first MAC-CE indicating the SCell activation command 310 along with the AP-TRS trigger and may transmit a second MAC-CE indicating the AP-CSI reporting trigger 335. In other words, the network entity 105 may include the SCell activation command 310 and the AP-CSI reporting trigger 335 in the same MAC-CE or different MAC-CEs.

[0086] To facilitate the joint AP-CMR / IMR triggering mechanism disclosed herein, the network entity 105 may configure multiple AP-CMR / IMR resources for fast CSI reporting when a SCell is enabled for the UE 115. In some implementations, separate AP-CMR / IMR resources may be configured for fast CSI reporting in the UE 115, where fast CSI reporting may refer to a CSI report triggered by an AP-CSI reporting trigger 335 sent on the same MAC-CE as the SCell activation command 310 or an AP-CSI reporting trigger 335 sent on a different MAC-CE sent within a threshold time duration from the MAC-CE containing the SCell activation command 310. Additionally or alternatively, AP-CMR / IMR resources configured for a deactivated SCell may be reused for fast CSI reporting in the UE 115. In other words, the UE 115 may receive a configuration, such as an RRC configuration, of a set of AP-CMR / IMR resources, where the set of AP-CMR / IMR resources may be dedicated to fast CSI reporting or may be shared with other CSI reporting techniques supported by the UE 115. In some implementations, one or more MAC-CEs that trigger AP-CSI reporting during SCell activation may indicate one AP-CMR / IMR pair 325, and the UE 115 may use one AP-CMR / IMR pair 325 for CSI measurements. For example, the UE 115 may be configured with a set of CMRs and a set of IMRs, and the AP-CSI reporting trigger 335 may indicate one CMR from the set of CMRs and one IMR from the set of IMRs to use for the triggered CSI measurements.

[0087] The UE 115 may transmit HARQ-ACK feedback information 315 associated with one or both of the SCell activation command 310 or the AP-CSI reporting trigger 335. For example, if the UE receives the SCell activation command 310 and the AP-CSI reporting trigger 335 on separate MAC-CEs, the UE may report the HARQ-ACK feedback information 315 for the SCell activation command 310 and the AP-CSI reporting trigger 335 in separate PUSCH transmissions. Alternatively, if the UE receives the SCell activation command 310 and the AP-CSI reporting trigger 335 via a consolidated MAC-CE, the UE may report the HARQ-ACK feedback information 315 for the SCell activation command 310 and the AP-CSI reporting trigger 335 in the same PUSCH transmission.

[0088] In some implementations, there may be a time duration of approximately 3 milliseconds between the slot allocated for transmission of the HARQ-ACK feedback information 315 and the slot allocated for transmission of the AP-TRS 320. Additionally or alternatively, there may be a time offset between the slot allocated for transmission of the AP-TRS 320 and the slot allocated for the AP-CMR / IMR pair 325 (during which the network entity 105 may transmit one or more reference signals). The network entity 105 may select, identify, confirm, or determine the duration of the time offset between the AP-TRS 320 and the AP-CMR / IMR pair 325 according to the UE's downlink synchronization capabilities, the network entity's downlink resource availability, or both.

[0089] Aspects of the subject matter disclosed in the preceding description of resource diagram 300 may be implemented to realize one or more of the following potential advantages. For example, the techniques and signaling mechanisms described with reference to FIG. 3 may reduce the latency of the SCell activation process by allowing the network entity 105 to jointly activate the SCell and trigger AP-CSI reporting for the SCell. More specifically, the network entity may transmit at least one MAC-CE indicating an activation command for the SCell and at least one AP-CMR / IMR to be used for AP-CSI measurements associated with the SCell, thereby enabling the UE to generate and report CSI to the network entity with reduced latency. As a result, the UE may activate the SCell in a relatively short time frame, thereby enabling the UE and the network entity to achieve a higher throughput level by using the activated SCell for subsequent communications.

[0090] 4 illustrates an example process flow 400 supporting a CSI reporting technique for SCell activation. Process flow 400 may implement or be implemented by one or more aspects of wireless communications system 100, signaling diagram 200, or resource diagram 300. For example, process flow 400 includes UE 115-b, which may be an example of one or more aspects of UE 115 or UE 115-a as illustrated by and described with reference to FIGS. 1 and 2. Process flow 400 also includes network entity 105-b, which may be an example of one or more aspects of network entity 105 or network entity 105-a as illustrated by and described with reference to FIGS. 1 and 2. In the following description of process flow 400, operations between UE 115-b and network entity 105-b may be added, omitted, or performed in a different order (relative to the order shown in the example of FIG. 4).

[0091] At 405, the UE 115-b may transmit capability information (such as capability information 205 as shown by and described with reference to FIG. 2) to the network entity 105-b. The capability information may indicate a threshold time duration (e.g., in terms of the number of slots) between receiving the AP-TRS and measuring the AP-CMR / IMR pair. The UE 115-b may signal the threshold time duration, sometimes referred to as a slot timing value, as an integer value between 0 and a maximum synchronization value for the UE 115-b. The network entity 105-b may use the capability information provided by the UE 115-b along with the downlink resource availability of the network entity 105-b to schedule the AP-TRS and AP-CMR / IMR pair for the UE 115-b.

[0092] At 410, the UE 115-b may receive one or more MAC-CEs (such as one or more MAC-CEs 210 as shown by and described with reference to FIG. 2) from the network entity 105-b. The one or more MAC-CEs may include an SCell activation command (such as an SCell activation command 310 as shown by and described with reference to FIG. 3), an AP-TRS trigger, and an AP-CSI reporting trigger (such as an AP-CSI reporting trigger 335 as shown by and described with reference to FIG. 3). In some implementations, the network entity 105-b may include the SCell activation command, the AP-TRS trigger, and the AP-CSI reporting trigger in a single MAC-CE. In some other implementations, the network entity 105-b may include the SCell activation command and the AP-CSI reporting trigger in separate MAC-CEs.

[0093] In some implementations, the UE 115-b may send 415 HARQ-ACK feedback information (such as the HARQ-ACK feedback information 315 described with reference to FIG. 3) to the network entity 105-b. The HARQ-ACK feedback information may indicate whether the UE 115-b successfully received one or more MAC-CEs carrying the SCell activation command, the AP-TRS trigger, and the AP-CSI reporting trigger. At 420, the UE 115-b may receive at least one AP-TRS (such as the AP-TRS 320 as shown by and described with reference to FIG. 3) from the network entity 105-b in accordance with the AP-TRS trigger indicated by the one or more MAC-CEs. The UE 115-b may use the at least one AP-TRS to perform AGC, FTL, TTL, and other downlink loop initialization processes for the SCell indicated by the SCell activation command.

[0094] At 425, the UE 115-b may perform measurements of at least one reference signal via (e.g., using) an AP-CMR / IMR pair (e.g., AP-CMR / IMR pair 220 or AP-CMR / IMR pair 325 as shown by and described with reference to FIG. 2) in accordance with the AP-CSI reporting trigger indicated by one or more MAC-CEs. The UE 115-b may use the measurements of the at least one reference signal via the AP-CMR / IMR pair to derive or generate CSI associated with the SCell indicated by the SCell activation command. At 430, the UE 115-b may transmit an AP-CSI report that includes or indicates CSI measurements associated with the SCell. In some implementations, upon receiving the AP-CSI report from the UE 115-b, the network entity 105-b may start scheduling downlink traffic on the SCell and may transmit PDSCH scheduling information to the UE 115-b at 435.

[0095] Aspects of the subject matter disclosed in the preceding description of process flow 400 may be implemented to achieve one or more of the following potential advantages. For example, the techniques and signaling mechanisms described with reference to FIG. 4 may reduce the latency of an SCell activation procedure by enabling the network entity 105-b to jointly activate the SCell and trigger AP-CSI reporting for the SCell. More specifically, the network entity 105-b may transmit at least one MAC-CE indicating an activation command for the SCell and at least one AP-CMR / IMR pair to be used for AP-CSI measurements associated with the SCell, thereby enabling the UE 115-b to generate and report CSI to the network entity with reduced latency. As a result, the UE 115-b may activate the SCell in a relatively shorter time span, thereby enabling the UE 115-b and the network entity 105-b to achieve a higher throughput level by using the activated SCell for subsequent communications.

[0096] 5 shows a block diagram 500 of an example device 505 that supports CSI reporting techniques for SCell activation. The device 505 may communicate (e.g., wirelessly) with one or more network entities (e.g., one or more components of one or more network entities 105), one or more UEs 115, or any combination thereof. The device 505 may include components for two-way voice and data communication, including components for transmitting and receiving communications, such as a communications manager 520, an input / output (I / O) controller 510, a transceiver 515, an antenna 525, memory 530, code 535, and a processor 540. These components may be in electronic communication or may be coupled (operably, communicatively, functionally, electronically, electrically, etc.) via one or more buses (e.g., bus 545).

[0097] The I / O controller 510 may manage input and output signals for the device 505. The I / O controller 510 may also manage peripheral devices not integrated into the device 505. In some implementations, the I / O controller 510 may represent a physical connection or port to an external peripheral device. In some implementations, the I / O controller 510 may utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I / O controller 510 may represent or be able to interact with a modem, keyboard, mouse, touchscreen, or similar device. In some implementations, the I / O controller 510 may be implemented as part of a processor or processor system, such as the processor 540. In some implementations, a user may interact with the device 505 through the I / O controller 510 or through hardware components controlled by the I / O controller 510.

[0098] In some implementations, the device 505 may include a single antenna 525. However, in some other implementations, the device 505 may have two or more antennas 525, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 515 may communicate bidirectionally via one or more antennas 525, wired links, or wireless links described herein. For example, the transceiver 515 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 515 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 525 for transmission, and demodulating packets received from the one or more antennas 525.

[0099] In some implementations, the transceiver 515 may include one or more interfaces, such as one or more interfaces coupled with one or more antennas 525 configured to support various receive or acquisition operations, or one or more interfaces coupled with one or more antennas 525 configured to support various transmit or output operations, or a combination thereof. In some implementations, the transceiver 515 may include, or be configured to couple to, one or more processors or memory components operable to perform or support operations based on received or acquired information or signals, or to generate information or other signals for transmission or other output, or any combination thereof. In some implementations, the transceiver 515, or the transceiver 515 and one or more antennas 525, or the transceiver 515 and one or more antennas 525 and one or more processors or memory components (such as the processor 540, or memory 530, or both), may be included on a chip or chip assembly installed in the device 505.

[0100] The memory 530 may include random access memory (RAM) and read-only memory (ROM). The memory 530 may store computer-readable computer-executable code 535, which includes instructions that, when executed by the processor 540, cause the device 505 to perform various functions described herein. The code 535 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some implementations, the code 535 may not be directly executable by the processor 540, but may (e.g., when compiled and executed) cause a computer to perform the functions described herein. In some implementations, the memory 530 may include, among other things, a basic I / O system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0101] The processor 540 may include an intelligent hardware device (such as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a central processing unit (CPU), a graphics processing unit (GPU), a field-programmable gate array (FPGA), a microcontroller, a programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof). In some scenarios, the processor 540 may be configured to operate a memory array using a memory controller. In some scenarios, the memory controller may be integrated into the processor 540. The processor 540 may be configured to execute computer-readable instructions stored in a memory (such as memory 530) to cause the device 505 to perform various functions (such as functions or tasks supporting CSI reporting techniques for SCell activation). For example, device 505 or a component of device 505 may include a processor 540 and memory 530 coupled to processor 540, where processor 540 and memory 530 are configured to perform various functions described herein. Processor 540 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as operating systems, virtual machines, or container instances) that may host functions (e.g., by executing code 535) to perform the functions of device 505.

[0102] Processor 540 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored on device 505 (e.g., in memory 530). In some implementations, processor 540 may be a component of a processing system. A processing system may generally refer to a system or set of machines or components that receives input, processes the input, and generates a set of outputs (e.g., that may be passed to other systems or components of device 505). For example, the processing system of device 505 may refer to a system that includes various other components or subcomponents of device 505, such as processor 540, or transceiver 515, or communications manager 520, or other components or combinations of components of device 505. The processing system of device 505 may interface with other components of device 505 and may process information (e.g., inputs or signals) received from other components or output information to other components. For example, a chip or modem of device 505 may include one or more interfaces to the processing system, for outputting information, for acquiring information, or both.

[0103] The one or more interfaces may be implemented as or include, among other implementations, a first interface configured to output information and a second interface configured to acquire information, or the same interface configured to both output information and acquire information. In some implementations, the one or more interfaces refer to an interface between a processing system and a transmitter of a chip or modem, such that the device 505 transmits information output from the chip or modem. Additionally or alternatively, in some implementations, the one or more interfaces refer to an interface between a processing system and a receiver of a chip or modem, such that the device 505 acquires information or signal input, and the information can be passed to the processing system. Those skilled in the art will readily recognize that the first interface can also acquire information or signal input, and the second interface can also output information or signal output.

[0104] The communications manager 520 may support wireless communications in a UE in accordance with examples disclosed herein. For example, the communications manager 520 may be configured with or may support receiving at least one MAC-CE over a first set of resources associated with a first cell that activates a second cell and triggers an AP-CSI report for the second cell. The communications manager 520 may be configured with or may support receiving one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The communications manager 520 may be configured with or may support transmitting AP-CSI reports associated with measurements of the one or more aperiodic reference signals.

[0105] In some implementations, to support receiving at least one MAC-CE, the communications manager 520 may be configured or may support receiving, via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, a first instruction to trigger AP-TRS measurements for the second cell and a second instruction to trigger AP-CSI reporting for the second cell, where the at least one MAC-CE is a single MAC-CE and receiving one or more aperiodic reference signals via the second set of resources in accordance with the second instruction.

[0106] In some implementations, to support receiving at least one MAC-CE, communications manager 520 may be configured with or may support receiving a first MAC-CE that activates a second cell and triggers AP-TRS measurements for the second cell. In some implementations, to support receiving at least one MAC-CE, communications manager 520 may be configured with or may support receiving a second MAC-CE that triggers AP-CSI reporting for the second cell, where receiving one or more aperiodic reference signals follows from the second MAC-CE.

[0107] In some implementations, the communications manager 520 may be configured or may support receiving, via control signaling, an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, where the plurality of aperiodic CMRs and a plurality of aperiodic IMRs include a second set of resources.

[0108] In some implementations, the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with AP-CSI reporting triggered by at least one MAC-CE that activates the second cell. In some implementations, the at least one MAC-CE indicates a second set of resources from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, where the second set of resources includes an aperiodic CMR from the plurality of aperiodic CMRs and an aperiodic IMR from the plurality of aperiodic IMRs.

[0109] In some implementations, the communications manager 520 may be configured with or may support means for receiving at least one AP-TRS via a third set of resources associated with the second cell, where the at least one MAC-CE further triggers the at least one AP-TRS, and where the at least one MAC-CE triggering the AP-CSI report indicates a time offset between the third set of resources and the second set of resources.

[0110] In some implementations, the communications manager 520 may be configured as or may support a means for transmitting a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, where the quantity of slots is associated with a threshold duration of the time offset between the third set of resources and the second set of resources and is associated with the UE's ability to acquire downlink synchronization using at least one AP-TRS, and where the second set of resources is scheduled according to downlink resource availability of the network entity.

[0111] In some implementations, the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of slots of 0 associated with a time offset between the third set of resources and the second set of resources. In some implementations, the communications manager 520 may be configured with or may support transmitting HARQ-ACK feedback for at least one MAC-CE over the fourth set of resources associated with the first cell.

[0112] In some implementations, to support transmitting an AP-CSI report, the communications manager 520 may be configured as or may support means for transmitting the AP-CSI report via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a fourth set of resources, where at least one MAC-CE triggering the AP-CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0113] In some implementations, to support transmitting an AP-CSI report, the communications manager 520 may be configured as or may support means for transmitting the AP-CSI report via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, where at least one MAC-CE triggering the AP-CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0114] In some implementations, to support receiving one or more aperiodic reference signals over the second set of resources, the communications manager 520 may be configured as or may support measuring CSI over at least one AP-CMR or AP-IMR associated with the second cell.

[0115] In some implementations, the communications manager 520 may be configured or may support receiving downlink scheduling information associated with the second cell according to the AP-CSI report from the UE. In some implementations, the communications manager 520 may be configured or may support receiving at least one downlink message according to the downlink scheduling information via the second cell.

[0116] In some implementations, to support transmitting the AP-CSI report, the communications manager 520 may be configured as or may support transmitting the AP-CSI report via a set of PUSCH resources associated with at least one of the first cell, the second cell, or the third cell activated for the UE.

[0117] In some implementations, the communications manager 520 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or in cooperation with the transceiver 515, one or more antennas 525, or a combination thereof. Although the communications manager 520 is shown as a component of the transceiver 515, in some implementations, one or more functions described with reference to the communications manager 520 may be supported or performed by the transceiver 515, the processor 540, the memory 530, the code 535, or any combination thereof. For example, the code 535 may include instructions executable by the processor 540 to cause the device 505 to perform various aspects of the CSI reporting techniques for SCell activation as described herein, or the processor 540 and the memory 530 may be configured to perform or support such operations.

[0118] 6 shows a block diagram 600 of an example device 605 supporting a CSI reporting technique for SCell activation. The device 605 may communicate with one or more network entities (e.g., one or more components of one or more network entities 105), one or more UEs 115, or any combination thereof, which may include communication via one or more wired interfaces, communication via one or more wireless interfaces, or any combination thereof. The device 605 may include components that support outputting and obtaining communications, such as a communications manager 620, a transceiver 610, an antenna 615, memory 625, code 630, and a processor 635. These components may be in electronic communication or may be coupled (operably, communicatively, functionally, electronically, electrically, etc.) via one or more buses (e.g., bus 640).

[0119] The transceiver 610 may support bidirectional communication via a wired link, a wireless link, or both, as described herein. In some implementations, the transceiver 610 may include a wired transceiver and may communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some implementations, the transceiver 610 may include a wireless transceiver and may communicate bidirectionally with another wireless transceiver. In some implementations, the device 605 may include one or more antennas 615 that may be capable of transmitting or receiving (e.g., simultaneously) wireless transmissions.

[0120] The transceiver 610 may also include a modem for modulating signals, providing the modulated signals for transmission (e.g., by one or more antennas 615 or by a wired transmitter), receiving the modulated signals (e.g., from one or more antennas 615 or from a wired receiver), and demodulating the signals. In some implementations, the transceiver 610 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 615 configured to support various receive or acquisition operations, or one or more interfaces coupled to one or more antennas 615 configured to support various transmit or output operations, or a combination thereof.

[0121] In some implementations, the transceiver 610 may include, or be configured to couple with, one or more processors or memory components operable to perform or support operations according to received or acquired information or signals, or to generate information or other signals for transmission or other output, or any combination thereof. In some implementations, the transceiver 610, or the transceiver 610 and one or more antennas 615, or the transceiver 610 and one or more antennas 615 and one or more processors or memory components (such as the processor 635, or memory 625, or both) may be included on a chip or chip assembly installed in the device 605. In some implementations, the transceiver may be operable to support communication over one or more communication links (such as the communication link 125, the backhaul communication link 120, the midhaul communication link 162, the fronthaul communication link 168, etc.).

[0122] The memory 625 may include RAM and ROM. The memory 625 may store computer-readable computer-executable code 630, which includes instructions that, when executed by the processor 635, cause the device 605 to perform various functions described herein. The code 630 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some scenarios, the code 630 may not be directly executable by the processor 635, but may (e.g., when compiled and executed) cause the computer to perform the functions described herein. In some scenarios, the memory 625 may include a BIOS, which may, among other things, control basic hardware or software operations, such as interactions with peripheral components or devices.

[0123] The processor 635 may include an intelligent hardware device (such as a general-purpose processor, a DSP, an ASIC, a CPU, a GPU, an FPGA, a microcontroller, a programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof). In some scenarios, the processor 635 may be configured to operate a memory array using a memory controller. In some scenarios, the memory controller may be integrated into the processor 635. The processor 635 may be configured to execute computer-readable instructions stored in a memory (such as the memory 625) to cause the device 605 to perform various functions (such as functions or tasks supporting CSI reporting techniques for SCell activation). For example, the device 605 or a component of the device 605 may include the processor 635 and the memory 625 coupled to the processor 635, where the processor 635 and the memory 625 are configured to perform various functions described herein.

[0124] The processor 635 may be an example of a cloud computing platform (e.g., one or more physical nodes and supporting software such as an operating system, virtual machine, or container instance) that may host functions (e.g., by executing the code 630) to perform the functions of the device 605. The processor 635 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored on the device 605 (e.g., in the memory 625). In some implementations, the processor 635 may be a component of a processing system. A processing system may generally refer to a system or set of machines or components that receives input, processes the input, and generates a set of output (e.g., that may be passed to other systems or components of the device 605). For example, the processing system of the device 605 may refer to a system that includes various other components or subcomponents of the device 605, such as the processor 635, or the transceiver 610, or the communications manager 620, or other components or combinations of components of the device 605.

[0125] The processing system of device 605 may interface with other components of device 605 and may process information (e.g., input or signals) received from other components or output information to other components. For example, a chip or modem of device 605 may include a processing system and one or more interfaces for outputting information, acquiring information, or both. The one or more interfaces may be implemented as or may include a first interface configured to output information and a second interface configured to acquire information, or the same interface configured to output information and acquire information, among other implementations.

[0126] In some implementations, the one or more interfaces refer to an interface between a processing system and a transmitter of a chip or modem, such that the device 605 can transmit information output from the chip or modem. Additionally or alternatively, in some implementations, the one or more interfaces refer to an interface between a processing system and a receiver of a chip or modem, such that the device 605 can obtain information or signal input and pass that information to the processing system. Those skilled in the art will readily recognize that the first interface can also obtain information or signal input and the second interface can also output information or signal output.

[0127] In some implementations, bus 640 may support communication of (e.g., within) protocol layers of a protocol stack. In some implementations, bus 640 may support communication associated with logical channels of a protocol stack (e.g., between protocol layers of a protocol stack), which may include communication performed within a component of device 605 or between different components of device 605 that may be collocated or located in different locations (device 605 may refer to a system in which one or more of communications manager 620, transceiver 610, memory 625, code 630, and processor 635 may be located in one of or split among different components, etc.).

[0128] In some implementations, the communications manager 620 may manage aspects of communications with the core network 130 (e.g., over one or more wired or wireless backhaul links). For example, the communications manager 620 may manage the forwarding of data communications for client devices, such as one or more UEs 115. In some implementations, the communications manager 620 may manage communications with other network entities 105 and may include a controller or scheduler for cooperating with the other network entities 105 to control communications with the UEs 115. In some implementations, the communications manager 620 may support an X2 interface in LTE / LTE-A wireless communication network technologies to provide communications between network entities 105.

[0129] The communications manager 620 may support wireless communications in a network entity in accordance with examples disclosed herein. For example, the communications manager 620 may be configured with or may support transmitting at least one MAC-CE over a first set of resources associated with a first cell that activates a second cell and triggers an AP-CSI report for the second cell. The communications manager 620 may be configured with or may support transmitting one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE. The communications manager 620 may be configured with or may support receiving AP-CSI reports associated with measurements of the one or more aperiodic reference signals.

[0130] In some implementations, to support transmitting at least one MAC-CE, the communications manager 620 may be configured or may support transmitting a first instruction to trigger AP-TRS measurements for the second cell and a second instruction to trigger AP-CSI reporting for the second cell via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, where the at least one MAC-CE is a single MAC-CE, and transmitting one or more aperiodic reference signals via the second set of resources in accordance with the second instruction.

[0131] In some implementations, to support transmitting at least one MAC-CE, the communications manager 620 may be configured with or may support transmitting a first MAC-CE that activates a second cell and triggers AP-TRS measurements for the second cell. In some implementations, to support transmitting at least one MAC-CE, the communications manager 620 may be configured with or may support transmitting a second MAC-CE that triggers AP-CSI reporting for the second cell, where transmitting one or more aperiodic reference signals follows the second MAC-CE.

[0132] In some implementations, the communications manager 620 may be configured or may support, via control signaling, an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, where the plurality of aperiodic CMRs and a plurality of aperiodic IMRs include a second set of resources.

[0133] In some implementations, the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with AP-CSI reporting triggered by at least one MAC-CE that activates the second cell. In some implementations, the at least one MAC-CE indicates a second set of resources from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, where the second set of resources includes an aperiodic CMR from the plurality of aperiodic CMRs and an aperiodic IMR from the plurality of aperiodic IMRs.

[0134] In some implementations, the communications manager 620 may be configured or may support means for transmitting at least one AP-TRS over a third set of resources associated with the second cell, where at least one MAC-CE further triggers the at least one AP-TRS, and where the at least one MAC-CE triggering the AP-CSI report indicates a time offset between the third set of resources and the second set of resources.

[0135] In some implementations, the communications manager 620 may be configured or may support a means for receiving a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, where the quantity of slots is associated with a threshold duration of the time offset between the third set of resources and the second set of resources and is associated with the UE's ability to acquire downlink synchronization using at least one AP-TRS, and where the second set of resources is scheduled according to downlink resource availability of the network entity.

[0136] In some implementations, the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of slots of 0 associated with a time offset between the third set of resources and the second set of resources. In some implementations, the communications manager 620 may be configured with or may support receiving HARQ-ACK feedback for at least one MAC-CE via a fourth set of resources associated with the first cell.

[0137] In some implementations, to support receiving an AP-CSI report, the communications manager 620 may be configured as or may support receiving an AP-CSI report via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a fourth set of resources, where at least one MAC-CE triggering the AP-CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0138] In some implementations, to support receiving an AP-CSI report, the communications manager 620 may be configured as or may support receiving an AP-CSI report via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, where at least one MAC-CE triggering the AP-CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0139] In some implementations, to support transmitting one or more aperiodic reference signals, the communications manager 620 may be configured or may support transmitting at least one aperiodic CSI-RS via at least one aperiodic CMR or aperiodic IMR associated with the second cell.

[0140] In some implementations, the communications manager 620 may be configured or may support transmitting downlink scheduling information associated with the second cell in accordance with the AP-CSI report. In some implementations, the communications manager 620 may be configured or may support transmitting at least one downlink message in accordance with the downlink scheduling information via the second cell.

[0141] In some implementations, to support receiving the AP-CSI report, the communications manager 620 may be configured with or may support receiving the AP-CSI report via a set of PUSCH resources associated with at least one of the first cell, the second cell, or the third cell.

[0142] In some implementations, the communications manager 620 may be configured to perform various operations (e.g., receiving, acquiring, monitoring, outputting, transmitting, etc.) using or in cooperation with the transceiver 610, one or more antennas 615 (if applicable), or any combination thereof. Although the communications manager 620 is shown as a separate component, in some implementations, one or more functions described with reference to the communications manager 620 may be supported or performed by the transceiver 610, the processor 635, the memory 625, the code 630, or any combination thereof. For example, the code 630 may include instructions executable by the processor 635 to cause the device 605 to perform various aspects of the CSI reporting techniques for SCell activation as described herein, or the processor 635 and the memory 625 may be configured to perform or support such operations.

[0143] 7 shows a flowchart illustrating an example method 700 for supporting a CSI reporting technique for SCell activation. The operations of method 700 may be implemented by a UE or components thereof. For example, the operations of method 700 may be performed by the UE 115 as described with reference to FIGS. 1-5. In some implementations, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may perform aspects of the described functions using dedicated hardware.

[0144] At 705, the UE may receive at least one MAC-CE that activates the second cell over the first set of resources associated with the first cell and triggers AP-CSI reporting for the second cell. The operations of 705 may be performed in accordance with examples disclosed herein.

[0145] At 710, the UE may receive one or more aperiodic reference signals over a second set of resources associated with the second cell according to the at least one MAC-CE. The operations of 710 may be performed according to examples disclosed herein.

[0146] The UE may transmit an AP-CSI report associated with the measurements of the one or more aperiodic reference signals at 715. The operations of 715 may be performed in accordance with examples disclosed herein.

[0147] FIG. 8 shows a flowchart illustrating an example method 800 for supporting a CSI reporting technique for SCell activation. The operations of method 800 may be implemented by a network entity or a component thereof. For example, the operations of method 800 may be performed by network entity 105 as described with reference to FIGS. 1-4 and 6. In some implementations, the network entity may execute a set of instructions to control functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may perform aspects of the described functions using dedicated hardware.

[0148] At 805, the network entity may transmit at least one MAC-CE over the first set of resources associated with the first cell to activate the second cell and trigger AP-CSI reporting for the second cell. The operations of 805 may be performed in accordance with examples disclosed herein.

[0149] At 810, the network entity may transmit one or more aperiodic reference signals over a second set of resources associated with the second cell according to the at least one MAC-CE. The operations of 810 may be performed according to examples disclosed herein.

[0150] At 815, the network entity may receive an AP-CSI report associated with measurements of one or more aperiodic reference signals. The operations of 815 may be performed in accordance with examples disclosed herein.

[0151] Example implementations are described in the following numbered clauses.

[0152] Clause 1: A method of wireless communication in a UE, the method including: receiving, via a first set of resources associated with a first cell, at least one MAC-CE, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell; receiving, in accordance with the at least one MAC-CE, one or more aperiodic reference signals via a second set of resources associated with the second cell; and transmitting an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0153] Clause 2: The method of clause 1, wherein receiving at least one MAC-CE includes receiving, via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, a first instruction to trigger aperiodic TRS measurements for the second cell and a second instruction to trigger aperiodic CSI reporting for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and receiving one or more aperiodic reference signals via the second set of resources is in accordance with the second instruction.

[0154] Clause 3: The method of clause 1 or 2, wherein receiving at least one MAC-CE includes receiving a first MAC-CE that activates a second cell and triggers aperiodic TRS measurements for the second cell, and receiving a second MAC-CE that triggers aperiodic CSI reporting for the second cell, and wherein receiving one or more aperiodic reference signals is in accordance with the second MAC-CE.

[0155] Clause 4: The method of any of clauses 1 to 3, further comprising receiving via control signaling an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprise a second set of resources.

[0156] Clause 5: The method according to clause 4, wherein the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with aperiodic CSI reporting triggered by at least one MAC-CE that activates the second cell.

[0157] Clause 6: The method of clause 4 or 5, wherein at least one MAC-CE indicates a second set of resources from a plurality of aperiodic CMRs and a plurality of aperiodic IMRs, and the second set of resources includes an aperiodic CMR from the plurality of aperiodic CMRs and an aperiodic IMR from the plurality of aperiodic IMRs.

[0158] Clause 7: The method of any of clauses 1 to 6, further comprising receiving at least one aperiodic TRS via a third set of resources associated with the second cell, wherein at least one MAC-CE further triggers the at least one aperiodic TRS, and the at least one MAC-CE triggering the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

[0159] Clause 8: The method of clause 7, further comprising: transmitting a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, wherein the quantity of slots is associated with a threshold duration of the time offset between the third set of resources and the second set of resources and is associated with the UE's ability to acquire downlink synchronization using at least one aperiodic TRS, and wherein the second set of resources has been scheduled according to downlink resource availability of the network entity.

[0160] Clause 9: The method of clause 8, wherein the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of 0 slots associated with a time offset between the third set of resources and the second set of resources.

[0161] Clause 10: The method of any one of clauses 1 to 9, further comprising transmitting HARQ-ACK feedback for at least one MAC-CE via a fourth set of resources associated with the first cell.

[0162] Clause 11: The method of clause 10, wherein transmitting the aperiodic CSI report includes transmitting the aperiodic CSI report via the set of PUSCH resources according to a time offset between the set of PUSCH resources and a fourth set of resources, and at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0163] Clause 12: The method of any one of clauses 1 to 11, wherein transmitting the aperiodic CSI report includes transmitting the aperiodic CSI report via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, and at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0164] Clause 13: The method of any of clauses 1 to 12, wherein receiving one or more aperiodic reference signals via a second set of resources includes measuring CSI via at least one aperiodic CMR or IMR associated with the second cell.

[0165] Clause 14: The method of any one of clauses 1 to 13, further comprising: receiving downlink scheduling information associated with a second cell according to the aperiodic CSI report from the UE; and receiving, via the second cell, at least one downlink message according to the downlink scheduling information.

[0166] Clause 15: The method of any of clauses 1 to 14, wherein transmitting the aperiodic CSI report includes transmitting the aperiodic CSI report over a set of PUSCH resources associated with at least one of the first cell, the second cell, or the third cell activated for the UE.

[0167] Clause 16: A method of wireless communication in a network entity, the method comprising: transmitting at least one MAC-CE over a first set of resources associated with a first cell, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell; transmitting one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE; and receiving aperiodic CSI reports associated with measurements of the one or more aperiodic reference signals.

[0168] Clause 17: The method of clause 16, wherein transmitting at least one MAC-CE includes transmitting, via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, a first instruction to trigger aperiodic TRS measurements for the second cell and a second instruction to trigger aperiodic CSI reporting for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and transmitting one or more aperiodic reference signals via the second set of resources is in accordance with the second instruction.

[0169] Clause 18: The method of clause 16 or 17, wherein transmitting at least one MAC-CE includes transmitting a first MAC-CE, the first MAC-CE activating a second cell and triggering aperiodic TRS measurements for the second cell, and transmitting a second MAC-CE triggering aperiodic CSI reporting for the second cell, and wherein transmitting one or more aperiodic reference signals is in accordance with the second MAC-CE.

[0170] Clause 19: The method of any of clauses 16 to 18, further comprising: transmitting, via control signaling, an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprise a second set of resources.

[0171] Clause 20: The method of clause 19, wherein the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with aperiodic CSI reporting triggered by at least one MAC-CE that activates the second cell.

[0172] Clause 21: The method of clause 19 or 20, wherein at least one MAC-CE indicates a second set of resources from a plurality of aperiodic CMRs and a plurality of aperiodic IMRs, and the second set of resources includes an aperiodic CMR from the plurality of aperiodic CMRs and an aperiodic IMR from the plurality of aperiodic IMRs.

[0173] Clause 22: The method of any of clauses 16 to 21, further comprising: transmitting at least one aperiodic TRS over a third set of resources associated with the second cell, wherein at least one MAC-CE further triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE triggering the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

[0174] Clause 23: The method of clause 22, further comprising receiving a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, wherein the quantity of slots is associated with a threshold duration of the time offset between the third set of resources and the second set of resources and is associated with the UE's ability to acquire downlink synchronization using at least one aperiodic TRS, and wherein the second set of resources has been scheduled according to downlink resource availability of the network entity.

[0175] Clause 24: The method of clause 23, wherein the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of 0 slots associated with a time offset between the third set of resources and the second set of resources.

[0176] Clause 25: The method of any of clauses 16 to 24, further comprising receiving HARQ-ACK feedback for at least one MAC-CE via a fourth set of resources associated with the first cell.

[0177] Clause 26: The method of clause 25, wherein receiving the aperiodic CSI report includes receiving the aperiodic CSI report via the set of PUSCH resources according to a time offset between the set of PUSCH resources and a fourth set of resources, and wherein at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0178] Clause 27: The method of any of Clauses 16 to 26, wherein receiving the aperiodic CSI report comprises receiving the aperiodic CSI report via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, and wherein at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0179] Clause 28: The method of any of clauses 16 to 27, wherein transmitting one or more aperiodic reference signals includes transmitting at least one aperiodic CSI-RS via at least one aperiodic CMR or IMR associated with the second cell.

[0180] Clause 29: The method of any of clauses 16 to 28, further comprising: transmitting downlink scheduling information associated with a second cell according to the aperiodic CSI report; and transmitting at least one downlink message via the second cell according to the downlink scheduling information.

[0181] Clause 30: The method of any of clauses 16 to 29, wherein receiving the aperiodic CSI report includes receiving the aperiodic CSI report via a set of PUSCH resources associated with at least one of the first cell, the second cell, or the third cell.

[0182] Clause 31: An apparatus for wireless communications in a UE, the apparatus including one or more interfaces configured to: acquire, via a first set of resources associated with a first cell, at least one MAC-CE that activates a second cell and triggers aperiodic CSI reporting for the second cell; acquire, in accordance with the at least one MAC-CE, one or more aperiodic reference signals via a second set of resources associated with the second cell; and output aperiodic CSI reports associated with measurements of the one or more aperiodic reference signals.

[0183] Clause 32: The apparatus described in Clause 31, wherein to acquire at least one MAC-CE, the one or more interfaces are configured to acquire, via the at least one MAC-CE in accordance with the at least one MAC-CE that activates the second cell, a first instruction to trigger aperiodic TRS measurements for the second cell and a second instruction to trigger aperiodic CSI reporting for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and acquiring one or more aperiodic reference signals via the second set of resources is in accordance with the second instruction.

[0184] Clause 33: The apparatus of clause 31 or 32, wherein, to acquire at least one MAC-CE, one or more interfaces are configured to acquire a first MAC-CE that activates a second cell and triggers aperiodic TRS measurements for the second cell, and acquire a second MAC-CE that triggers aperiodic CSI reporting for the second cell, and wherein acquiring one or more aperiodic reference signals is in accordance with the second MAC-CE.

[0185] Clause 34: The apparatus of any of clauses 31 to 33, wherein the one or more interfaces are further configured to obtain, via control signaling, an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, wherein the plurality of aperiodic CMRs and a plurality of aperiodic IMRs comprise a second set of resources.

[0186] Clause 35: The apparatus of clause 34, wherein the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with aperiodic CSI reporting triggered by at least one MAC-CE that activates the second cell.

[0187] Clause 36: The apparatus described in clause 34 or 35, wherein at least one MAC-CE indicates a second set of resources from a plurality of aperiodic CMRs and a plurality of aperiodic IMRs, and the second set of resources includes aperiodic CMRs from the plurality of aperiodic CMRs and aperiodic IMRs from the plurality of aperiodic IMRs.

[0188] Clause 37: The apparatus of any of clauses 31 to 36, further configured such that one or more interfaces acquire at least one aperiodic TRS via a third set of resources associated with the second cell, and wherein at least one MAC-CE further triggers at least one aperiodic TRS, and wherein the at least one MAC-CE triggering the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

[0189] Clause 38: The device described in Clause 37, wherein the one or more interfaces are further configured to output a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, the quantity of slots being associated with a threshold duration of the time offset between the third set of resources and the second set of resources and being associated with the device's ability to acquire downlink synchronization using at least one aperiodic TRS, and the second set of resources being scheduled according to downlink resource availability of the network entity.

[0190] Clause 39: The apparatus of clause 38, wherein the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of zero slots associated with a time offset between the third set of resources and the second set of resources.

[0191] Clause 40: The apparatus described in any of clauses 31 to 39, further configured to: output HARQ-ACK feedback for at least one MAC-CE via a fourth set of resources associated with the first cell, wherein the one or more interfaces are further configured to:

[0192] Clause 41: The apparatus of Clause 40, wherein, to output aperiodic CSI reporting, one or more interfaces are configured to output the aperiodic CSI reporting via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a fourth set of resources, and at least one MAC-CE that triggers the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0193] Clause 42: The apparatus according to any one of clauses 31 to 41, wherein, to output aperiodic CSI reporting, one or more interfaces are configured to output the aperiodic CSI reporting via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, and at least one MAC-CE that triggers the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0194] Clause 43: An apparatus described in any of clauses 31 to 42, wherein one or more interfaces are configured to measure CSI via at least one aperiodic CMR or IMR associated with the second cell to obtain one or more aperiodic reference signals via a second set of resources.

[0195] Clause 44: The device described in any of clauses 31 to 43, wherein the one or more interfaces are further configured to: obtain downlink scheduling information associated with a second cell according to aperiodic CSI reporting from the device; and obtain at least one downlink message according to the downlink scheduling information via the second cell.

[0196] Clause 45: The apparatus of any one of Clauses 31 to 44, wherein, to output the aperiodic CSI report, the one or more interfaces are configured to output the aperiodic CSI report via a set of PUSCH resources associated with at least one of the first cell, the second cell, or the third cell activated for the apparatus.

[0197] Clause 46: An apparatus according to any of clauses 31 to 45, further comprising a processing system configured and capable of performing one or more functions or operations of the apparatus.

[0198] Clause 47: An apparatus for wireless communication in a network entity, the apparatus including one or more interfaces configured to: output at least one MAC-CE, via a first set of resources associated with a first cell, that activates a second cell and triggers aperiodic CSI reporting for the second cell; output one or more aperiodic reference signals, via a second set of resources associated with the second cell, in accordance with the at least one MAC-CE; and obtain aperiodic CSI reports associated with measurements of the one or more aperiodic reference signals.

[0199] Clause 48: The apparatus described in Clause 47, wherein the one or more interfaces are configured to output, for outputting at least one MAC-CE, a first instruction for triggering aperiodic TRS measurements for the second cell and a second instruction for triggering aperiodic CSI reporting for the second cell via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, wherein the at least one MAC-CE is a single MAC-CE and outputs one or more aperiodic reference signals via the second set of resources in accordance with the second instruction.

[0200] Clause 49: The apparatus of clause 47 or 48, wherein, to output at least one MAC-CE, the one or more interfaces are configured to: output a first MAC-CE that activates a second cell and triggers aperiodic TRS measurements for the second cell; output a second MAC-CE that triggers aperiodic CSI reporting for the second cell; and outputting one or more aperiodic reference signals in accordance with the second MAC-CE.

[0201] Clause 50: The apparatus of any of clauses 47 to 49, wherein the one or more interfaces are further configured to output, via control signaling, an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprising a second set of resources.

[0202] Clause 51: The apparatus of clause 50, wherein the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with aperiodic CSI reporting triggered by at least one MAC-CE that activates the second cell.

[0203] Clause 52: The apparatus described in clause 50 or 51, wherein at least one MAC-CE indicates a second set of resources from a plurality of aperiodic CMRs and a plurality of aperiodic IMRs, and the second set of resources includes aperiodic CMRs from the plurality of aperiodic CMRs and aperiodic IMRs from the plurality of aperiodic IMRs.

[0204] Clause 53: The apparatus of any of clauses 47 to 52, further configured such that the one or more interfaces output at least one aperiodic TRS over a third set of resources associated with the second cell, and wherein at least one MAC-CE further triggers at least one aperiodic TRS, and the at least one MAC-CE triggering the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

[0205] Clause 54: The apparatus described in Clause 53, wherein the one or more interfaces are further configured to obtain a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, the quantity of slots being associated with a threshold duration of the time offset between the third set of resources and the second set of resources and being associated with the UE's ability to acquire downlink synchronization using at least one aperiodic TRS, and the second set of resources being scheduled according to downlink resource availability of the apparatus.

[0206] Clause 55: The apparatus of clause 54, wherein the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of zero slots associated with a time offset between the third set of resources and the second set of resources.

[0207] Clause 56: The apparatus described in any of clauses 47 to 55, further configured to: one or more interfaces obtain HARQ-ACK feedback for at least one MAC-CE via a fourth set of resources associated with the first cell.

[0208] Clause 57: The apparatus of Clause 56, wherein to obtain aperiodic CSI reporting, one or more interfaces are configured to obtain the aperiodic CSI reporting via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a fourth set of resources, and at least one MAC-CE that triggers the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0209] Clause 58: The apparatus according to any one of clauses 47 to 57, wherein, to obtain aperiodic CSI reporting, one or more interfaces are configured to obtain the aperiodic CSI reporting via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, and at least one MAC-CE triggering the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0210] Clause 59: An apparatus described in any of clauses 47 to 58, wherein the one or more interfaces are configured to output at least one aperiodic CSI-RS via at least one aperiodic CMR or IMR associated with the second cell in order to output one or more aperiodic reference signals.

[0211] Clause 60: The apparatus of any of clauses 47 to 59, wherein the one or more interfaces are further configured to output downlink scheduling information associated with the second cell according to the aperiodic CSI reporting, and to output at least one downlink message according to the downlink scheduling information via the second cell.

[0212] Clause 61: The apparatus of any of clauses 47 to 60, wherein, to obtain the aperiodic CSI report, the one or more interfaces are configured to obtain the aperiodic CSI report via a set of PUSCH resources associated with at least one of the first cell, the second cell, or the third cell.

[0213] Clause 62: An apparatus according to any of clauses 47 to 61, further comprising a processing system configured and capable of performing one or more functions or operations of the apparatus.

[0214] Clause 63: An apparatus for wireless communications in a UE, comprising: means for receiving, via a first set of resources associated with a first cell, at least one MAC-CE, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; means for receiving, via a second set of resources associated with the second cell in accordance with the at least one MAC-CE, one or more aperiodic reference signals; and means for transmitting an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0215] Clause 64: The apparatus of Clause 63, wherein the means for receiving at least one MAC-CE includes means for receiving, via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, a first instruction to trigger aperiodic TRS measurements for the second cell and a second instruction to trigger aperiodic CSI reporting for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and receiving one or more aperiodic reference signals via the second set of resources is in accordance with the second instruction.

[0216] Clause 65: The apparatus of clause 63 or 64, wherein the means for receiving at least one MAC-CE includes: means for receiving a first MAC-CE, the first MAC-CE activating a second cell and triggering aperiodic TRS measurements for the second cell; and means for receiving a second MAC-CE triggering aperiodic CSI reporting for the second cell, wherein receiving the one or more aperiodic reference signals is in accordance with the second MAC-CE.

[0217] Clause 66: The apparatus of any of clauses 63 to 65, further comprising: means for receiving, via control signaling, an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprise a second set of resources.

[0218] Clause 67: The apparatus of clause 66, wherein the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with aperiodic CSI reporting triggered by at least one MAC-CE that activates the second cell.

[0219] Clause 68: The apparatus described in clause 66 or 67, wherein at least one MAC-CE indicates a second set of resources from a plurality of aperiodic CMRs and a plurality of aperiodic IMRs, and the second set of resources includes aperiodic CMRs from the plurality of aperiodic CMRs and aperiodic IMRs from the plurality of aperiodic IMRs.

[0220] Clause 69: The apparatus of any of clauses 63 to 68, further comprising: means for receiving at least one aperiodic TRS via a third set of resources associated with the second cell, wherein at least one MAC-CE further triggers at least one aperiodic TRS, and wherein the at least one MAC-CE triggering the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

[0221] Clause 70: The apparatus of Clause 69, further comprising: means for transmitting a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, the quantity of slots being associated with a threshold duration of the time offset between the third set of resources and the second set of resources and being associated with an ability of the UE to acquire downlink synchronization using at least one aperiodic TRS, and the second set of resources being scheduled according to downlink resource availability of the network entity.

[0222] Clause 71: The apparatus of clause 70, wherein the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of slots of 0 associated with a time offset between the third set of resources and the second set of resources.

[0223] Clause 72: The apparatus of any of clauses 63 to 71, further comprising: means for transmitting HARQ-ACK feedback for at least one MAC-CE via a fourth set of resources associated with the first cell.

[0224] Clause 73: The apparatus of Clause 72, wherein the means for transmitting the aperiodic CSI report includes means for transmitting the aperiodic CSI report via the set of PUSCH resources according to a time offset between the set of PUSCH resources and the fourth set of resources, and at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0225] Clause 74: The apparatus according to any one of clauses 63 to 73, wherein the means for transmitting the aperiodic CSI report comprises means for transmitting the aperiodic CSI report via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, and wherein at least one MAC-CE triggering the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0226] Clause 75: The apparatus described in any of clauses 63 to 74, wherein the means for receiving one or more aperiodic reference signals via a second set of resources includes means for measuring CSI via at least one aperiodic CMR or IMR associated with the second cell.

[0227] Clause 76: The apparatus according to any one of clauses 63 to 75, further comprising: means for receiving downlink scheduling information associated with a second cell according to the aperiodic CSI report from the UE; and means for receiving, via the second cell, at least one downlink message according to the downlink scheduling information.

[0228] Clause 77: The apparatus of any of clauses 63 to 76, wherein the means for transmitting the aperiodic CSI report includes means for transmitting the aperiodic CSI report over a set of PUSCH resources associated with at least one of a first cell, a second cell, or a third cell activated for the UE.

[0229] Clause 78: An apparatus for wireless communications in a network entity, comprising: means for transmitting, via a first set of resources associated with a first cell, at least one MAC-CE, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell; means for transmitting, via a second set of resources associated with the second cell in accordance with the at least one MAC-CE, one or more aperiodic reference signals; and means for receiving an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0230] Clause 79: The apparatus described in Clause 78, wherein the means for transmitting at least one MAC-CE includes means for transmitting, via the at least one MAC-CE in accordance with the at least one MAC-CE that activates the second cell, a first instruction for triggering aperiodic TRS measurements for the second cell and a second instruction for triggering aperiodic CSI reporting for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and transmitting one or more aperiodic reference signals via the second set of resources is in accordance with the second instruction.

[0231] Clause 80: The apparatus of clause 78 or 79, wherein the means for transmitting at least one MAC-CE includes: means for transmitting a first MAC-CE that activates a second cell and triggers aperiodic TRS measurements for the second cell; and means for transmitting a second MAC-CE that triggers aperiodic CSI reporting for the second cell, and wherein transmitting the one or more aperiodic reference signals is in accordance with the second MAC-CE.

[0232] Clause 81: The apparatus of any of clauses 78 to 80, further comprising: means for transmitting, via control signaling, an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprise a second set of resources.

[0233] Clause 82: The apparatus of clause 81, wherein the indication of the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicates that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with aperiodic CSI reporting triggered by at least one MAC-CE that activates the second cell.

[0234] Clause 83: The apparatus described in clause 81 or 82, wherein at least one MAC-CE indicates a second set of resources from a plurality of aperiodic CMRs and a plurality of aperiodic IMRs, and the second set of resources includes aperiodic CMRs from the plurality of aperiodic CMRs and aperiodic IMRs from the plurality of aperiodic IMRs.

[0235] Clause 84: The apparatus of any of clauses 78 to 83, further comprising: means for transmitting at least one aperiodic TRS via a third set of resources associated with the second cell, wherein at least one MAC-CE further triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE triggering the aperiodic CSI reporting indicates a time offset between the third set of resources and the second set of resources.

[0236] Clause 85: The apparatus of Clause 84, further comprising: means for receiving a message indicating a quantity of slots associated with a time offset between the third set of resources and the second set of resources, the quantity of slots being associated with a threshold duration of the time offset between the third set of resources and the second set of resources and being associated with an ability of the UE to acquire downlink synchronization using at least one aperiodic TRS, and the second set of resources being scheduled according to downlink resource availability of the network entity.

[0237] Clause 86: The apparatus of clause 85, wherein the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a quantity of slots of 0 associated with a time offset between the third set of resources and the second set of resources.

[0238] Clause 87: The apparatus of any of clauses 78 to 86, further comprising: means for receiving HARQ-ACK feedback for at least one MAC-CE via a fourth set of resources associated with the first cell.

[0239] Clause 88: The apparatus of clause 87, wherein the means for receiving aperiodic CSI reporting includes means for receiving the aperiodic CSI reporting via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a fourth set of resources, and at least one MAC-CE that triggers the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

[0240] Clause 89: The apparatus according to any one of clauses 78 to 88, wherein the means for receiving aperiodic CSI reporting includes means for receiving the aperiodic CSI reporting via a set of PUSCH resources according to a time offset between the set of PUSCH resources and a second set of resources, and wherein at least one MAC-CE triggering the aperiodic CSI reporting indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

[0241] Clause 90: The apparatus of any of clauses 78 to 89, wherein the means for transmitting one or more aperiodic reference signals includes means for transmitting at least one aperiodic CSI-RS via at least one aperiodic CMR or IMR associated with the second cell.

[0242] Clause 91: The apparatus of any of clauses 78 to 90, further comprising: means for transmitting downlink scheduling information associated with the second cell according to the aperiodic CSI report; and means for transmitting at least one downlink message via the second cell according to the downlink scheduling information.

[0243] Clause 92: The apparatus of any of clauses 78 to 91, wherein the means for receiving aperiodic CSI reports includes means for receiving the aperiodic CSI reports via a set of PUSCH resources associated with at least one of the first cell, the second cell, or the third cell.

[0244] Clause 93: A non-transitory computer-readable medium storing code for wireless communications in a UE, the code including instructions executable by a processor to receive, via a first set of resources associated with a first cell, at least one MAC-CE that activates a second cell and triggers aperiodic CSI reporting for the second cell; receive, via a second set of resources associated with the second cell in accordance with the at least one MAC-CE, one or more aperiodic reference signals; and transmit an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0245] Clause 94: A non-transitory computer-readable medium storing code for wireless communications in a network entity, the code including instructions executable by a processor to: transmit at least one MAC-CE over a first set of resources associated with a first cell, the at least one MAC-CE activating a second cell and triggering aperiodic CSI reporting for the second cell; transmit one or more aperiodic reference signals over a second set of resources associated with the second cell in accordance with the at least one MAC-CE; and receive aperiodic CSI reports associated with measurements of the one or more aperiodic reference signals.

[0246] As used herein, the terms "determine" or "determining" encompass a wide variety of actions, and thus "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as via a lookup in a table, database, or another data structure), inferring, ascertaining, etc. Also, "determining" can include receiving (such as receiving information), accessing (such as accessing data stored in a memory), etc. Also, "determining" can include resolving, selecting, choosing, establishing, and other similar acts.

[0247] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. As an example, "at least one of a, b, or c" is intended to encompass a, b, c, ab, ac, bc, and abc.

[0248] The various exemplary logic, logic blocks, modules, circuits, and algorithmic processes described in connection with the implementations disclosed herein may be implemented as electronic hardware, computer software, or a combination of both. Interchangeability between hardware and software has been generally described in terms of functionality and illustrated in the various exemplary components, blocks, modules, circuits, and processes above. Whether such functionality is implemented using hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0249] The hardware and data processing devices used to implement the various example logic, logic blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented or performed using general-purpose single-chip or multi-chip processors, DSPs, ASICs, 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, or any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a DSP in combination with one or more microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. In some implementations, particular processes and methods may be performed by circuitry specific to a given function.

[0250] In one or more aspects, the functions described may be implemented using hardware, digital electronic circuitry, computer software, firmware, or any combination thereof, including the structures disclosed herein and their structural equivalents. Implementations of the subject matter described herein may also be implemented as one or more computer programs, as one or more modules of computer program instructions encoded on a computer storage medium for execution by or to control the operation of a data processing apparatus.

[0251] If implemented in software, the functions may be stored on or transmitted using one or more instructions or code on a computer-readable medium. The processes of a method or algorithm disclosed herein may be implemented in a processor-executable software module, which may reside on a computer-readable medium. Computer-readable media includes both computer storage media and communication media, including any medium that may enable a computer program to be transferred from one place to another. A storage medium may be any available medium that can be accessed by a computer. By way of example, and not limitation, such computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection may be properly referred to as a computer-readable medium. As used herein, disk and disc include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs. A disk may reproduce data magnetically, and a disk may reproduce data optically using a laser. Combinations of the above may also be included within the scope of computer-readable media. Additionally, operations of a method or algorithm may reside on machine-readable and computer-readable media, which may be embodied as one or any combination or set of code and instructions in a computer program product.

[0252] Various modifications to the implementations described in this disclosure may be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other implementations without departing from the spirit or scope of the disclosure. Thus, the claims are not intended to be limited to the implementations shown herein, but are to be accorded the widest scope consistent with this disclosure and the principles and features disclosed herein.

[0253] Additionally, those skilled in the art will readily appreciate that the terms "upper" and "lower" may be used to facilitate description of the figures and refer to relative positions corresponding to the orientation of the figure on a properly oriented page, and may not reflect the proper orientation of any device in which it may be implemented.

[0254] Some features described herein in the context of separate implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations separately or in any suitable subcombination. Furthermore, while features may be described above as working in several combinations and may even initially be claimed as such, one or more features from a claimed combination may be deleted from that combination, and the claimed combination may be directed to a subcombination or a variation of the subcombination.

[0255] Similarly, while operations are illustrated in the figures in a particular order, this should not be understood as requiring such operations to be performed in the particular order or sequential order shown, or that all of the operations shown be performed, to achieve desirable results. Furthermore, the figures may generally depict one or more exemplary processes in the form of a flow diagram. However, other operations not shown may be incorporated into the generally depicted exemplary process. For example, one or more additional operations may be performed before, after, simultaneously with, or between any of the depicted operations. In some situations, multitasking and parallel processing may be advantageous. Moreover, the separation of various system components in the above-described implementations should not be understood as requiring such separation in all implementations, and it should be understood that the described program components and systems may generally be integrated together in a single software product or packaged in multiple software products. Additionally, other implementations are within the scope of the following claims. In some implementations, the actions recited in the claims may be performed in a different order and still achieve desirable results.

Claims

1. User equipment (UE), A processing system comprising one or more processors and one or more memories storing code, coupled to the one or more processors, wherein the processing system provides the UE, Through a first set of resources associated with the first cell, at least one media access control (MAC)-control element (CE) is obtained which activates the second cell and triggers a non-periodic channel status information (CSI) report for the second cell. In accordance with the at least one MAC-CE, one or more aperiodic reference signals are obtained via a second set of resources associated with the second cell. A UE configured to output a non-periodic CSI report associated with the measured values ​​of one or more non-periodic reference signals.

2. In order to obtain the aforementioned at least one MAC-CE, the processing system, The UE according to claim 1, further configured to obtain, via the at least one MAC-CE, a first instruction to trigger an aperiodic tracking reference signal (TRS) measurement for the second cell and a second instruction to trigger the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and obtaining the one or more aperiodic reference signals via a second set of resources is in accordance with the second instruction.

3. In order to obtain the aforementioned at least one MAC-CE, the processing system, A first MAC-CE is acquired, which activates the second cell and triggers a non-periodic tracking reference signal (TRS) measurement for the second cell. The UE according to claim 1, further configured to acquire a second MAC-CE that triggers the aperiodic CSI report for the second cell, wherein acquiring the one or more aperiodic reference signals is subject to the second MAC-CE.

4. The aforementioned processing system The UE according to claim 1, further configured to obtain instructions for a plurality of aperiodic channel measurement resources (CMRs) and a plurality of aperiodic interference measurement resources (IMRs) associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include a second set of resources.

5. The UE according to claim 4, wherein the instructions for the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicate that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with the aperiodic CSI report triggered by the at least one MAC-CE that activates the second cell.

6. The UE according to claim 4, wherein the at least one MAC-CE represents a second set of resources from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, the second set of resources comprising aperiodic CMRs from the plurality of aperiodic CMRs and aperiodic IMRs from the plurality of aperiodic IMRs.

7. The aforementioned processing system The UE according to claim 1, further configured to acquire at least one aperiodic tracking reference signal (TRS) via a third set of resources associated with the second cell, wherein the at least one MAC-CE further triggers the at least one aperiodic TRS, and the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third set of resources and the second set of resources.

8. The aforementioned processing system The UE according to claim 7, further configured to output a message indicating the number of slots associated with the time offset between the third set of resources and the second set of resources, wherein the number of slots is associated with a threshold duration of the time offset between the third set of resources and the second set of resources, and with the ability of the device to achieve downlink synchronization using the at least one aperiodic TRS, and the second set of resources is scheduled according to the downlink resource availability of the network entity.

9. The UE according to claim 8, wherein the second set of resources and the third set of resources are scheduled in the same time slot if the message indicates a number of zero slots associated with the time offset between the third set of resources and the second set of resources.

10. The aforementioned processing system The UE according to claim 1, further configured to output hybrid automatic retransmission request (HARQ)-acknowledgment (ACK) feedback for the at least one MAC-CE via a fourth set of resources associated with the first cell.

11. In order to output the aperiodic CSI report, the processing system The UE according to claim 10, further configured to output the aperiodic CSI report via the set of PUSCH resources according to a time offset between the set of physical uplink shared channel (PUSCH) resources and a fourth set of the resources, wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

12. In order to output the aperiodic CSI report, the processing system The UE according to claim 1, further configured to output the aperiodic CSI report via the set of PUSCH resources according to a time offset between the set of physical uplink shared channel (PUSCH) resources and a second set of the resources, wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the second set of resources.

13. In order to acquire the one or more aperiodic reference signals via a second set of the resources, the processing system Channel state information (CSI) is measured via at least one non-periodic channel measurement resource (CMR) or interference measurement resource (IMR) associated with the second cell. The UE according to claim 1, further configured as follows.

14. The aforementioned processing system In accordance with the aperiodic CSI report from the device, downlink scheduling information associated with the second cell is obtained. The UE according to claim 1, further configured to acquire at least one downlink message via the second cell in accordance with the downlink scheduling information.

15. In order to output the aperiodic CSI report, the processing system The UE according to claim 1, further configured to output the aperiodic CSI report via a set of physical uplink shared channel (PUSCH) resources associated with at least one of the first cell, the second cell, or the third cell activated for the device.

16. A network entity for wireless communication, A processing system comprising one or more processors and one or more memories storing code, coupled to the one or more processors, wherein the processing system provides the network entity Through a first set of resources associated with the first cell, at least one media access control (MAC)-control element (CE) causes at least one MAC-CE to activate the second cell and trigger an aperiodic channel status information (CSI) report for the second cell. According to the at least one MAC-CE, one or more aperiodic reference signals are output via a second set of resources associated with the second cell. A network entity configured to obtain aperiodic CSI reports associated with measurements of one or more aperiodic reference signals.

17. In order to output the at least one MAC-CE, the processing system The network entity according to claim 16, further configured to output, via the at least one MAC-CE, a first instruction to trigger an aperiodic tracking reference signal (TRS) measurement for the second cell and a second instruction to trigger the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and outputting the one or more aperiodic reference signals via a second set of resources is in accordance with the second instruction.

18. In order to output the at least one MAC-CE, the processing system A first MAC-CE that outputs a first MAC-CE which activates the second cell and triggers a non-periodic tracking reference signal (TRS) measurement for the second cell, It is further configured to output a second MAC-CE that triggers the aperiodic CSI report for the second cell, and the output of the one or more aperiodic reference signals is in accordance with the second MAC-CE. The network entity according to claim 16.

19. The aforementioned processing system The network entity according to claim 16, further configured to output instructions for a plurality of aperiodic channel measurement resources (CMRs) and a plurality of aperiodic interference measurement resources (IMRs) associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include a second set of resources.

20. The network entity according to claim 19, wherein the instructions for the plurality of aperiodic CMRs and the plurality of aperiodic IMRs indicate that the plurality of aperiodic CMRs and the plurality of aperiodic IMRs are exclusively associated with the aperiodic CSI report triggered by the at least one MAC-CE that activates the second cell.

21. The at least one MAC-CE indicates a second set of resources from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs. The network entity according to claim 19, wherein the second set of resources includes aperiodic CMRs from the plurality of aperiodic CMRs and aperiodic IMRs from the plurality of aperiodic IMRs.

22. A method of wireless communication in user equipment (UE), A first set of resources associated with a first cell, through which at least one media access control (MAC)-control element (CE) receives at least one MAC-CE that activates a second cell and triggers a periodic channel status information (CSI) report for the second cell, Receiving one or more aperiodic reference signals via a second set of resources associated with the second cell, according to the at least one MAC-CE, A method comprising transmitting a periodic CSI report associated with a measurement of one or more of the aforementioned periodic reference signals.

23. Receiving at least one MAC-CE means The method according to claim 22, comprising receiving a first instruction to trigger an aperiodic tracking reference signal (TRS) measurement for the second cell and a second instruction to trigger the aperiodic CSI report for the second cell via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, wherein the at least one MAC-CE is a single MAC-CE and receiving the one or more aperiodic reference signals via a second set of resources in accordance with the second instruction.

24. Receiving at least one MAC-CE means A first MAC-CE that receives the first MAC-CE, which activates the second cell and triggers a non-periodic tracking reference signal (TRS) measurement for the second cell, The method according to claim 22, comprising receiving a second MAC-CE that triggers the aperiodic CSI report for the second cell, wherein receiving the one or more aperiodic reference signals is according to the second MAC-CE.

25. The method according to claim 22, further comprising receiving at least one aperiodic tracking reference signal (TRS) via a third set of resources associated with the second cell, wherein the at least one MAC-CE further triggers the at least one aperiodic TRS, and the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third set of resources and the second set of resources.

26. A method for wireless communication in a network entity, A first set of resources associated with a first cell, wherein at least one media access control (MAC)-control element (CE) transmits at least one MAC-CE that activates a second cell and triggers a periodic channel status information (CSI) report for the second cell, Transmitting one or more aperiodic reference signals via a second set of resources associated with the second cell, according to the at least one MAC-CE, A method comprising receiving a non-periodic CSI report associated with a measurement of one or more non-periodic reference signals.

27. ​​The method of claim 26, further comprising transmitting at least one aperiodic tracking reference signal (TRS) via a third set of resources associated with the second cell, wherein the at least one MAC-CE further triggers the at least one aperiodic TRS, and the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third set of resources and the second set of resources.

28. The method of claim 27, further comprising receiving a message indicating a number of slots associated with the time offset between a third set of resources and a second set of resources, wherein the number of slots is associated with a threshold duration of the time offset between the third set of resources and the second set of resources, and with the ability of a user equipment (UE) to achieve downlink synchronization using the at least one non-periodic TRS, and the second set of resources is scheduled according to the downlink resource availability of the network entity.

29. The method according to claim 26, further comprising receiving hybrid automatic retransmission request (HARQ)-acknowledgment (ACK) feedback for the at least one MAC-CE via a fourth set of resources associated with the first cell.

30. Receiving the aperiodic CSI report, The method according to claim 29, comprising receiving the aperiodic CSI report via the set of PUSCH resources according to a time offset between the set of physical uplink shared channel (PUSCH) resources and a fourth set of the resources, wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates the set of PUSCH resources and the time offset between the set of PUSCH resources and the fourth set of resources.

31. The method of claim 26, further comprising transmitting a first instruction to trigger an aperiodic tracking reference signal (TRS) measurement for the second cell and a second instruction to trigger the aperiodic CSI report for the second cell via the at least one MAC-CE in accordance with the at least one MAC-CE activating the second cell, wherein the at least one MAC-CE is a single MAC-CE, and transmitting the one or more aperiodic reference signals via a second set of resources in accordance with the second instruction.

32. A first MAC-CE comprising transmitting the first MAC-CE to activate the second cell and trigger a non-periodic tracking reference signal (TRS) measurement for the second cell, The method according to claim 26, further comprising transmitting a second MAC-CE that triggers the aperiodic CSI report for the second cell, wherein transmitting one or more aperiodic reference signals is according to the second MAC-CE.

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