Channel state information (CSI) reporting techniques for secondary cell (SCell) activation

Abstract

The present disclosure provides systems, methods, and apparatus 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. The network entity may signal the SCell activation command, the AP-TRS trigger, and the AP-CSI report trigger in the same MAC-CE or in a separate MAC-CE. A UE may receive and measure an AP-TRS according to an AP-TRS trigger indicated by 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 an AP-CSI report trigger indicated by one or more MAC-CEs. Accordingly, the UE may transmit an AP-CSI report associated with the measurement.

Description

[0001] Cross-reference

[0002] This patent application claims priority to U.S. Patent Application No. 18 / 049,493, entitled "CHANNEL STATE INFORMATION (CSI) REPORTING TECHNIQUES FOR SECONDARY CELL (SCELL) ACTIVATION," filed on October 25, 2022, by Ryu et al., which is assigned to the assignee of the present application and is hereby incorporated by reference in its entirety. Field of the Invention

[0003] Broadly speaking, the present disclosure relates to wireless communication, and more particularly, to channel state information (CSI) reporting techniques for secondary cell (SCell) activation. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, etc. These systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multi-access systems include fourth-generation (4G) systems (such as Long-Term Evolution (LTE) systems, Advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multi-access communication system may include one or more base stations (BSs) or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices (which may also be referred to as user equipment (UEs)). Summary of the Invention

[0005] The systems, methods, and devices of the present disclosure each have several innovative aspects, none of which alone is responsible for the desired attributes disclosed herein.

[0006] One innovative aspect of the subject matter described in this disclosure may be implemented in a method for wireless communication at a user equipment (UE). The method may include: receiving at least one medium access control (MAC)-control element (CE) via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic channel state information (CSI) report for the second cell. The method may further include: receiving one or more aperiodic reference signals via a second resource set associated with the second cell according to 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.

[0007] Another innovative aspect of the subject matter described in this disclosure may be implemented in an apparatus for wireless communication at 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 at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell. The one or more interfaces may further be configured to: obtain one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The one or more interfaces may further be configured to: output an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals. In some implementations, the processing system may be configured to and capable of implementing the described operations of the apparatus.

[0008] Another innovative aspect of the subject matter described in this disclosure may be implemented in an apparatus for wireless communication at a UE. The apparatus may include: a unit for receiving at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell. The apparatus may further include: a unit for receiving one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The apparatus may further include: a unit for transmitting an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0009] Another innovative aspect of the subject matter described in this disclosure may be implemented in a non-transitory computer-readable medium storing code for wireless communication at a UE. The code may include instructions executable by a processor to: receive at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell. The code may further include instructions executable by a processor to: receive one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The code may further include instructions executable by a processor to: transmit an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0010] Some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein may include operations, features, units, or instructions for: receiving, according to at least one MAC-CE that activates a second cell, a first indication and a second indication via the at least one MAC-CE, the first indication for triggering an aperiodic tracking reference signal (TRS) measurement for the second cell, the second indication for triggering an aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein receiving the one or more aperiodic reference signals via the second resource set is according to the second indication.

[0011] Some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein may include operations, features, units, or instructions for: receiving a first MAC-CE that activates a second cell and triggers an aperiodic TRS measurement for the second cell; and receiving a second MAC-CE that triggers an aperiodic CSI report for the second cell, wherein receiving the one or more aperiodic reference signals is according to the second MAC-CE.

[0012] Another innovative aspect of the subject matter described in this disclosure may be implemented in a method for wireless communication at a network entity. The method may include: transmitting at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell. The method may further include: transmitting one or more aperiodic reference signals via a second resource set associated with the second cell according to 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.

[0013] Another innovative aspect of the subject matter described in this disclosure may be implemented in an apparatus for wireless communication at 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 via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell. The one or more interfaces may also be configured to: output one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The one or more interfaces may also be configured to: obtain an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals. In some implementations, the processing system may be configured to and capable of implementing the described operations of the apparatus.

[0014] Another innovative aspect of the subject matter described in this disclosure may be implemented in an apparatus for wireless communication at a network entity. The apparatus may include: means for transmitting at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell. The apparatus may also include: means for transmitting one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The apparatus may also include: means for receiving an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0015] Another innovative aspect of the subject matter described in this disclosure may be implemented in a non-transitory computer-readable medium storing code for wireless communication at a network entity. The code may include instructions executable by a processor to: transmit at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell. The code may also include instructions executable by a processor to: transmit one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The code may also include instructions executable by a processor to: receive an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0016] Some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending an indication of a plurality of aperiodic channel measurement resources (CMRs) and a plurality of aperiodic interference measurement resources (IMRs) associated with a second cell via control signaling, wherein a set of the plurality of aperiodic CMRs and a set of the plurality of aperiodic IMRs include a second resource set.

[0017] Some implementations of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for: sending at least one aperiodic TRS via a third resource set associated with a second cell, wherein at least one MAC-CE also triggers at least one aperiodic TRS, and wherein at least one MAC-CE that triggers an aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

[0018] 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, the drawings, and the claims. Note that the relative dimensions in the drawings may not be drawn to scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An example wireless communication system that supports channel state information (CSI) reporting techniques for secondary cell (SCell) activation is shown.

[0020] Figure 2 An example signaling diagram that supports CSI reporting techniques for SCell activation is shown.

[0021] Figure 3 An example resource diagram that supports CSI reporting techniques for SCell activation is shown.

[0022] Figure 4 An example process flow that supports CSI reporting techniques for SCell activation is shown.

[0023] Figure 5 and Figure 6 A block diagram of an example device that supports CSI reporting techniques for SCell activation is shown.

[0024] Figure 7 and Figure 8 A flowchart that illustrates an example method that supports CSI reporting techniques for SCell activation is shown.

[0025] Like reference numerals and designations in the various drawings indicate like elements. Detailed implementation manners

[0026] For the purpose of describing the innovative aspects of the present disclosure, the following description relates to some implementation manners. However, those of ordinary skill in the art will readily recognize that the teachings herein can be applied in many different ways. The described implementation manners can be implemented in any device, system, or network capable of transmitting and receiving radio frequency (RF) signals according to any one of the Institute of Electrical and Electronics Engineers (IEEE) 16.11 standards or any one of the following: IEEE 802.11 standards, Bluetooth® standards, 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 (HSUPA), Evolved High-Speed Packet Access (HSPA+), Long-Term Evolution (LTE), AMPS, or other known signals for communication within a wireless, cellular, or Internet of Things (IoT) network (e.g., a system utilizing the third generation (3G), fourth generation (4G), fifth generation (5G), or sixth generation (6G), or other implementations and technologies thereof).

[0027] In some wireless communication systems that support carrier aggregation, a network entity can communicate with a user equipment (UE) using multiple aggregated carrier frequencies, which can be referred to as cells or component carriers (CCs). One of the cells in a cell can be designated as a primary cell (PCell), while other cells can be designated as secondary cells (SCells). Compared with a single-carrier communication scheme, using an SCell can enable the network entity and the UE to communicate over a larger effective bandwidth, which can result in higher achievable throughput and greater spectral diversity. The network entity can activate the SCell for the UE by transmitting a Medium Access Control (MAC)-Control Element (CE) indicating an SCell activation command. In some scenarios, the MAC-CE can also trigger one or more aperiodic tracking reference signals (AP-TRS), and the UE can use the one or more AP-TRS for one or more of the automatic gain control (AGC), frequency tracking loop (FTL), and time tracking loop (TTL) operations at the UE (to accelerate the downlink loop initialization of the SCell).

[0028] When a secondary cell (SCell) has been activated for a UE, a network entity can use the SCell to communicate with the UE. However, in some scenarios, the network entity may not be able to schedule downlink communication on the SCell until the network entity receives a channel state information (CSI) report from the UE. To generate the CSI report, the UE can receive and measure one or more CSI reference signals (CSI-RS), synchronization signal blocks (SSB), or other reference signals via a set of one or more channel measurement resources (CMR) and one or more interference measurement resources (IMR). For example, if there is a delay between the reception of the SCell activation command and the next available set of CMR and IMR, the UE may not be able to complete the SCell activation process and may not be able to receive downlink communication from the network entity using the SCell for the duration of the delay.

[0029] Aspects of the present disclosure support techniques for reducing the latency of the SCell activation process by enabling a network entity to jointly transmit an aperiodic CSI (AP-CSI) report trigger with the SCell activation command. In some implementations, the network entity can transmit a single MAC control element (MAC-CE) that includes the AP-CSI report trigger for the UE, the SCell activation command, and an AP-TRS trigger. In some other implementations, the network entity can include the AP-CSI report trigger in separate MAC-CEs. The AP-CSI report trigger can indicate at least one aperiodic CMR / IMR (AP-CMR / IMR) pair for CSI measurement associated with the SCell. In some implementations, the AP-CSI report trigger can indicate at least one AP-CMR / IMR pair relative to a set of AP-TRS resources indicated by the AP-TRS trigger. For example, a time slot offset from the AP-TRS resources can be used to identify the AP-CMR / IMR pair.

[0030] In some implementations, the AP-CSI report trigger may also indicate the physical uplink shared channel (PUSCH) resources for the UE to transmit the AP-CSI report. Accordingly, based on receiving the SCell activation command, the AP-TRS trigger, and the AP-CSI report trigger (such as in the same MAC-CE or in 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 use the PUSCH resources indicated by the AP-CSI report trigger to send the AP-CSI report to the network entity. In some implementations, the network entity may configure the time offset (such as the number of time slots) between one or more AP-TRSs and at least one AP-CMR / IMR pair according to the UE's downlink synchronization capability, or the network entity's downlink resource availability, or both.

[0031] Certain 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 the latency of SCell activation by enabling the network entity to jointly activate the SCell and trigger the AP-CSI report for the UE. More specifically, the network entity may send at least one MAC-CE that indicates the activation command for the SCell and at least one AP-CMR / IMR pair for the UE to perform AP-CSI measurements associated with the SCell, which may enable the UE to generate CSI and report the CSI to the network entity with reduced latency. Accordingly, the UE may activate the SCell within a relatively short time span, enabling the UE and the network entity to achieve a higher throughput level by using the activated SCell for subsequent communication. Based on this lower latency and higher throughput level, the UE and the network entity may experience greater multi-connectivity, higher data rates, higher spectral efficiency, and greater system capacity, among other benefits.

[0032] Figure 1 An example wireless communication system 100 that supports CSI reporting techniques for SCell activation is shown. 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 Long Term Evolution (LTE) network, an enhanced LTE (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating according to other system and radio technologies (including future system and radio technologies not explicitly mentioned herein).

[0033] Network entity 105 can be dispersed throughout a geographical area to form a wireless communication system 100 and can be devices in different forms or with different capabilities. In various examples, network entity 105 can be referred to as a network element, a mobile element, a radio access network (RAN) node, or a network device among other names. In some implementations, network entity 105 and UE 115 can communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, network entity 105 can support a coverage area 110 (e.g., geographical coverage area), and UE 115 and network entity 105 can establish one or more communication links 125 over coverage area 110. Coverage area 110 can be an example of a geographical area over which network entity 105 and UE 115 can support the transmission of signals according to one or more radio access technologies (RATs).

[0034] UE 115 can be dispersed throughout the entire coverage area 110 of wireless communication system 100, and each UE 115 can be stationary, or mobile, or both at different times. UE 115 can be devices in different forms or with different capabilities. Some example UEs 115 are shown in Figure 1 which. The UEs 115 described herein can be capable of supporting communication with various types of devices (such as other UEs 115 or network entity 105), as Figure 1 shown.

[0035] 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, a device, an equipment, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the 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 yet another aspect of this example, the first node, the second node, and the third node may be different from these examples. Similarly, with reference to the UE 115, the disclosure that the network entity 105, the device, the equipment, the computing system, etc. may include the UE 115, the network entity 105, the device, the equipment, the computing system, etc. being nodes. For example, the disclosure that the UE 115 is configured to receive information from the network entity 105 also discloses that the first node is configured to receive information from the second node.

[0036] In some implementations, the network entity 105 may communicate with the core network 130, or with each other, or both. For example, the network entity 105 may communicate with the core network 130 via one or more backhaul communication links 120 (such as, according to the S1, N2, N3, or other interface protocols). In some implementations, the network entity 105 may communicate with each other directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130) via the backhaul communication link 120 (such as, according to the X2, Xn, or other interface protocols). In some implementations, the network entity 105 may communicate with each other via the midhaul communication link 162 (such as, according to the midhaul interface protocol) or the fronthaul communication link 168 (such as, according to the 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 one or more wired links (such as, electrical links, fiber optic links), one or more wireless links (such as, radio links, wireless optical links), and other examples or various combinations thereof. The UE 115 may communicate with the core network 130 via the communication link 155.

[0037] One or more of the network entities 105 described herein may include or may be referred to as a base station (BS) 140 (such as a base station transceiver station, radio BS, NR BS, access point, radio transceiver, Node B, eNodeB (eNB), next-generation Node B or gigabit Node B (any of which may be referred to as a gNB), 5G NB, next-generation eNB (ng-eNB), home NodeB, home eNodeB, or other suitable terms). In some implementations, the network entity 105 (such as the BS 140) may be implemented in an integrated (such as monolithic, stand-alone) BS architecture, which may be configured to utilize a protocol stack physically or logically integrated within a single network entity 105 (such as a single RAN node, e.g., base station 140).

[0038] In some implementations, the network entity 105 may be implemented in a disaggregated architecture (such as a disaggregated BS architecture, disaggregated RAN architecture), which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 105, such as an integrated access backhaul (IAB) network, open RAN (O-RAN) (such as a network configuration sponsored by the O-RAN Alliance), or virtualized RAN (vRAN) (such as cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: 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), non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof.

[0039] The RU 170 may also be referred to as a radio head, intelligent radio head, remote radio head (RRH), remote radio unit (RRU), or transmit receive point (TRP). One or more components of the network entity 105 in a disaggregated RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (such as separate physical locations). In some implementations, one or more network entities 105 of a disaggregated RAN architecture may be implemented as virtual units (such as virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0040] The functional split between the CU 160, DU 165, and RU 170 is flexible and can support different functions depending on which functions (such as network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at the CU 160, DU 165, or RU 170. For example, the functional split of the protocol stack can 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 can host upper layer protocol layer (such as layer 3 (L3), layer 2 (L2)) functions and signaling (such as radio resource control (RRC), service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)).

[0041] The CU 160 can be connected to one or more DU 165s or RU 170s, and one or more DU 165s or RU 170s can host lower protocol layers, such as layer 1 (L1) (such as the physical (PHY) layer) or L2 (such as the radio link control (RLC) layer, MAC layer) functions and signaling, and each DU 165 or RU 170 can be at least partially controlled by the CU 160. Additionally or alternatively, the functional split of the protocol stack can be adopted between the DU 165 and the RU 170 such that the DU 165 can support one or more layers of the protocol stack and the RU 170 can support one or more different layers of the protocol stack.

[0042] The DU 165 can support one or more different cells (such as via one or more RU 170s). In some implementations, the functional split between the CU 160 and the DU 165 or between the DU 165 and the RU 170 can be within the protocol layer (such as some functions of the protocol layer can be performed by one of the CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by a different one of the CU 160, DU 165, or RU 170). The CU 160 can be further functionally split into a CU control plane (CU-CP) and a CU user plane (CU-UP) function.

[0043] The CU 160 can be connected to one or more DUs 165 via a midhaul communication link 162 (such as F1, F1-c, F1-u), and the DU 165 can be connected to one or more RUs 170 via a fronthaul communication link 168 (such as an open fronthaul (FH) interface). In some implementations, the midhaul communication link 162 or the fronthaul communication link 168 can be implemented according to an interface (such as a channel) between layers of a protocol stack supported by the corresponding network entities 105 communicating via such communication links.

[0044] In a wireless communication system (such as the wireless communication system 100), the infrastructure and spectrum resources for radio access can support a wireless backhaul link capability to supplement a wired backhaul connection, thereby providing an IAB network architecture (such as to the core network 130). In some implementations, in an IAB network, one or more network entities 105 (such as the IAB node 104) can be partially controlled by each other. One or more IAB nodes 104 can be referred to as donor entities or IAB donors.

[0045] One or more DUs 165 or one or more RUs 170 can be partially controlled by one or more CUs 160 associated with a donor network entity 105 (such as a donor base station 140). One or more donor network entities 105 (such as IAB donors) can communicate with one or more additional network entities 105 (such as IAB nodes 104) via supported access and backhaul links (such as the backhaul communication link 120). The IAB node 104 can include an IAB mobile terminal (IAB-MT) controlled (such as scheduled) by the DU 165 of the coupled IAB donor. The IAB-MT can include a separate set of antennas for relaying communications with the UE 115, or can share the same antennas of the IAB node 104 (such as of the RU 170) for access via the DU 165 of the IAB node 104 (such as referred to as a virtual IAB-MT (vIAB-MT)).

[0046] In some implementations, the IAB node 104 can include a DU 165 that supports communication links with additional entities (such as IAB nodes 104, UEs 115) within a relay chain or configuration in the access network (such as downstream). In such implementations, one or more components of the split RAN architecture (such as one or more IAB nodes 104 or components of the IAB node 104) can be configured to operate according to the techniques described herein.

[0047] In an implementation context where the techniques described herein are applied to a split RAN architecture, one or more components of the split RAN architecture can be configured to support CSI reporting techniques for SCell activation as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (such as base station 140) can alternatively or additionally be performed by one or more components of the split RAN architecture (such as IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0048] UE 115 may include or may be referred to as a mobile device, wireless device, remote device, handheld device, or user equipment, or some other suitable term, where "device" may also be referred to as a unit, station, terminal, or client, among other examples. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some implementations, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine type communication (MTC) device, among other examples, which may be implemented in various items such as appliances, or vehicles, meters, and other examples.

[0049] UE 115 described herein may be capable of communicating with various types of devices (such as other UE 115s that can sometimes act as repeaters, as well as network entity 105 and network devices (including macro eNB or gNB, small cell eNB or gNB, or relay base stations, among other examples)), as Figure 1 shown.

[0050] UE 115 and network entity 105 can communicate wirelessly with each other via one or more communication links 125 (such as 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 communication link 125. For example, a carrier for communication link 125 may include a portion of an RF spectrum band (such as a bandwidth part (BWP)) that operates according to one or more physical layer channels for a given radio access technology (such as LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (such as synchronization signals, system information), control signaling for coordinating the operation of the carrier, user data, or other signaling. The wireless communication system 100 may use carrier aggregation or multi-carrier operation to support communication with UE 115.

[0051] 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 duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between a device and any part of the network entity 105 (such as an entity, a sub-entity). 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 of the RAN (such as BS 140, CU 160, DU 165, RU 170) communicating with another device (such as communicating directly or via one or more other network entities 105).

[0052] In some implementations (such as in a carrier aggregation configuration), a carrier may also have control signaling for obtaining signaling or coordinating operations for other carriers. A carrier may be associated with a frequency channel (such as an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute RF channel number (EARFCN)) and may be identified according to a channel raster for discovery by the UE 115. A carrier may operate in an independent mode, for which initial acquisition and connection may be performed by the UE 115 via the carrier, or a carrier may operate in a non-independent mode, for which a different carrier (such as of the same or different radio access technology) is used to anchor the connection.

[0053] The communication link 125 shown in the wireless communication system 100 may include a downlink transmission (such as a forward link transmission) from the network entity 105 to the UE 115, an uplink transmission (such as a return link transmission) from the UE 115 to the network entity 105, or both, and other transmission configurations. A carrier may carry downlink or uplink communication (such as in FDD mode) or may be configured to carry both downlink and uplink communication (such as in TDD mode).

[0054] A carrier can be associated with a specific bandwidth of the RF spectrum, and in some implementations, the carrier bandwidth can be referred to as the "system bandwidth" of the carrier or the wireless communication system 100. For example, the carrier bandwidth can be one of a set of bandwidths for a carrier of a specific radio access technology (such as 1.4 megahertz, 3 megahertz, 5 megahertz, 10 megahertz, 15 megahertz, 20 megahertz, 40 megahertz, or 80 megahertz (MHz)). Devices of the wireless communication system 100 (such as the network entity 105, the UE 115, or both) can have a hardware configuration that supports communication using a specific carrier bandwidth, or can be configurable to support communication using one of a set of carrier bandwidths. In some implementations, the wireless communication system 100 can include a network entity 105 or a UE 115 that supports simultaneous communication using carriers associated with multiple carrier bandwidths. In some implementations, each served UE 115 can be configured to operate using a portion (such as a subband, a BWP) or all of the carrier bandwidth.

[0055] The signal waveform transmitted via a carrier can be composed of multiple subcarriers (such as 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 an MCM technique, a resource element can refer to the resource of one symbol period (such as the duration of one modulation symbol) and one subcarrier, for which the symbol period and the subcarrier spacing can be inversely related. The number of bits carried by each resource element can depend on the modulation scheme (such as the order of the modulation scheme, the coding rate of the modulation scheme, or both), such that a relatively large number of resource elements (such as during the transmission duration) and a relatively high-order modulation scheme can correspond to a relatively high rate of communication. Wireless communication resources can refer to a combination of RF spectrum resources, time resources, and space resources (such as spatial layers, beams), and the use of multiple space resources can increase the data rate or data integrity for communication with the UE 115.

[0056] One or more numerologies can be supported for a carrier, and a numerology can include a subcarrier spacing ( ), and a cyclic prefix. A carrier can be divided into one or more BWPs having the same or different numerologies. In some implementations, the UE 115 can be configured with multiple BWPs. In some implementations, a single BWP for a carrier can be active at a given time, and communication for the UE 115 can be restricted to one or more active BWPs.

[0057] The time intervals for network entity 105 or UE 115 can be expressed as multiples of a basic time unit which, in some implementations, can refer to a sampling period of seconds, for which can represent the supported subcarrier spacing, and can represent the supported discrete Fourier transform (DFT) size). The time intervals of communication resources can be organized according to radio frames each having a specified duration such as 10 milliseconds (ms). Each radio frame can be identified by a system frame number (SFN) such as ranging from 0 to 1023.

[0058] Each frame can include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot can have the same duration. In some implementations, a frame can be divided (such as in the time domain) into subframes, and each subframe can be further divided into a number of time slots. Alternatively, each frame can include a variable number of time slots, and the number of time slots can depend on the subcarrier spacing. Each time slot can include a number of symbol periods (such as depending on the length of the cyclic prefix added in front of each symbol period). In some wireless communication systems 100, a time slot can be further divided into a plurality of mini - slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period can be associated with one or more (such as a) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0059] A subframe, time slot, mini - slot or symbol can be the smallest scheduling unit (such as in the time domain) of wireless communication system 100 and can be referred to as a transmission time interval (TTI). In some implementations, the TTI duration (such as the number of symbol periods in a TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of wireless communication system 100 can be dynamically selected (such as in the form of a burst of shortened TTIs (sTTIs)).

[0060] Physical channels can be multiplexed using carriers according to various techniques for communication. The physical control channel and the physical data channel can be multiplexed, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques for signaling via a downlink carrier. A control region for the physical control channel (such as a control resource set (CORESET)) can be defined by a set of symbol periods and can extend across the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (such as CORESETs) can be configured for a set of UEs 115. For example, one or more of the UEs 115 can monitor or search a control region for control information according to one or more search space sets, and each search space set can include one or more control channel candidates having one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate can refer to the amount of control channel resources (such as control channel elements (CCEs)) associated with the coded information for a control information format having a given payload size. The search space set can include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0061] The network entity 105 can provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" can refer to a logical communication entity for communicating with the network entity 105 (such as using a carrier) and can be associated with an identifier (such as a physical cell identifier (PCID), a virtual cell identifier (VCID), or other identifier) for differentiating adjacent cells. In some implementations, a cell can also refer to a coverage area 110 or a portion of the coverage area 110 (such as a sector) on which the logical communication entity operates. Depending on various factors such as the capabilities of the network entity 105, the scope of such cells can range from a smaller area (such as a structure, a subset of a structure) to a larger area. For example, a cell can be or include a building, a subset of a building, or an external space between or overlapping the coverage areas 110, etc.

[0062] Macro cells typically cover a relatively large geographical area (such as a radius of several kilometers) and can allow unrestricted access by UEs 115 having a service subscription with the network provider that supports the macro cell. Compared with macro cells, small cells can be associated with a lower-power network entity 105 (such as a lower-power BS 140), and small cells can operate using the same or different (such as licensed, unlicensed) frequency bands as macro cells. Small cells can provide unrestricted access to UEs 115 having a service subscription with the network provider, or can provide restricted access to UEs 115 associated with the small cell (such as UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a residence or office). The network entity 105 can support one or more cells and can also use one or more component carriers to support communication via one or more cells.

[0063] In some implementations, a carrier can support multiple cells, and different cells can be configured according to different protocol types (such as MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)), and different protocol types can provide access for different types of devices.

[0064] In some implementations, the network entity 105 (such as BS 140, RU 170) can be movable and thus provide communication coverage for a mobile coverage area 110. In some implementations, different coverage areas 110 associated with different technologies can overlap, but different coverage areas 110 can be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies can be supported by different network entities 105. The wireless communication system 100 can include, for example, a heterogeneous network, where different types of network entities 105 provide coverage for respective coverage areas 110 using the same or different radio access technologies.

[0065] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC). The UE 115 can be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communication can include private communication or group communication and can be supported by one or more services (such as push-to-talk, video, or data). Support for ultra-reliable, low-latency functions can include prioritization of services, and such services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency can be used interchangeably herein.

[0066] In some implementations, the UE 115 may be configured to support direct communication with other UEs 115 via a device-to-device (D2D) communication link 135 (such as, according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some implementations, one or more UEs 115 in a group performing D2D communication may be within the coverage area 110 of a network entity 105 (such as, a BS 140, RU 170), and the network entity 105 may support aspects of such D2D communication configured (such as, scheduled) by the network entity 105. In some implementations, one or more UEs 115 in such a group may be outside the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some implementations, the groups of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, in which each UE 115 transmits to each of the other UEs 115 in the group. In some implementations, the network entity 105 may facilitate the scheduling of resources for D2D communication. In some other examples, D2D communication may be performed between UEs 115 without involving the network entity 105.

[0067] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity that routes packets to or interconnects with an external network (such as, a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for the UE 115 served by a network entity 105 (such as, a BS 140) associated with the core network 130. User IP packets may be transported through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to IP services 150 for one or more network operators. The IP services 150 may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0068] The wireless communication system 100 may operate using one or more frequency bands, which may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or the decimeter band because the wavelengths range in length from approximately one decimeter to one meter. UHF waves may be blocked or redirected by buildings and environmental features, which may be referred to as clusters, but these waves may be sufficient to penetrate structures to serve UEs 115 located indoors by a macro cell. Compared to communications using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, communications using UHF waves may be associated with smaller antennas and shorter distances, such as less than 100 kilometers.

[0069] The wireless communication system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communication system 100 may use an unlicensed band, such as the 5 GHz industrial, scientific, and medical (ISM) band, to employ licensed-assisted access (LAA), LTE-unlicensed (LTE-U) radio access technology, or NR technology. When operating using an unlicensed RF spectrum band, devices, such as network entity 105 and UE 115, may employ carrier sensing for collision detection and avoidance. In some implementations, the operation using an unlicensed band may be in accordance with a carrier aggregation configuration that combines operation using a licensed band, such as LAA, for a component carrier. The operation using unlicensed spectrum may include downlink transmission, uplink transmission, peer-to-peer (P2P) transmission, or device-to-device (D2D) transmission, etc.

[0070] The network entity 105, such as BS 140, RU 170, or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operation or transmit or receive beamforming. For example, one or more BS antennas or antenna arrays may be co-located at 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 at different geographical locations. The network entity 105 may include an antenna array having a set of antenna ports in rows and columns that the network entity 105 may use to support beamforming for communication with the UE 115. Similarly, the UE 115 may include one or more antenna arrays, which may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals transmitted via the antenna ports.

[0071] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (such as network entity 105 or UE 115) to form or direct an antenna beam (such as a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining the signals transmitted via the antenna elements of an antenna array such that some signals propagating along a particular azimuth relative to the antenna array experience constructive interference while other signals experience destructive interference. The adjustment of the signals transmitted via the antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with the device. The adjustment associated with each of the antenna elements can be defined by a set of beamforming weights associated with a particular azimuth (such as relative to the antenna array of the transmitting device or the receiving device, or relative to some other azimuth).

[0072] In some implementations, transmissions made by a device (such as by network entity 105 or UE 115) can be performed using multiple beam directions, and the device can use a combination of digital precoding or beamforming to generate a combined beam for transmission (such as from network entity 105 to UE 115). UE 115 can report feedback indicating precoding weights for one or more beam directions, and the feedback can correspond to a configured set of beams across the system bandwidth or one or more subbands. Network entity 105 can transmit reference signals that may or may not be precoded (such as cell-specific reference signals (CRS), CSI-RS). UE 115 can provide feedback for beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (such as multi-panel type codebooks, linear combination type codebooks, port selection type codebooks). Although these techniques are described with reference to signals transmitted by network entity 105 (such as BS 140, RU 170) along one or more directions, UE 115 can employ similar techniques to transmit signals multiple times along different directions (such as for identifying beam directions for subsequent transmission or reception by UE 115) or to transmit signals along a single direction (such as for transmitting data to a receiving device).

[0073] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a receiving device (such as network entity 105), a receiving device (such as UE 115) may perform receiving operations according to multiple receiving configurations (such as directional listening). For example, the receiving device may perform receiving according to multiple receiving directions in the following ways: by receiving via different antenna sub-arrays, by processing the received signals according to different antenna sub-arrays, by receiving according to different sets of receive beamforming weights (such as different sets of directional listening weights) applied to the signals received at multiple antenna elements of an antenna array, or by processing the received signals according to different sets of receive beamforming weights applied to the signals received at multiple antenna elements of an antenna array. Any of the above ways may be referred to as "listening" according to different receiving configurations or receiving directions. In some implementations, the receiving device may use a single receiving configuration to receive along a single beam direction (such as when receiving a data signal). The single receiving configuration may be aligned along a beam direction determined according to listening based on different receiving configuration directions (such as a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening based on multiple beam directions).

[0074] Wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communication at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly for communication via logical channels. The MAC layer may perform priority handling and multiplexing of logical channels to transport channels. The MAC layer may also implement error detection techniques, error correction techniques, or both to support retransmissions to improve link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between UE 115 and network entity 105 or core network 130. The PHY layer may map transport channels to physical channels.

[0075] Retransmission protocols (such as Hybrid Automatic Repeat reQuest (HARQ)) can also provide performance gains. HARQ protocols can support various HARQ signaling between the transmitting and receiving wireless communication devices as well as signaling between the PHY and MAC layers to improve the retransmission operations in the wireless communication system 100. HARQ uses a combination of error detection and error correction. For example, a HARQ transmission can include error check bits added to the data to be transmitted using an error detection (ED) code (such as Cyclic Redundancy Check (CRC)). The receiving device can use the error check bits to determine whether it has correctly decoded the received HARQ transmission. In some implementations, the original data (information bits) to be transmitted can be encoded using a Forward Error Correction (FEC) code (such as a Low-Density Parity-Check (LDPC) coding scheme that systematically encodes the information bits to generate parity bits). The transmitting device can send 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, thus avoiding retransmission.

[0076] Implementing the HARQ protocol in the wireless communication system 100 can improve the reliability of data transmitted from the transmitting device to the receiving device. The HARQ protocol can support the establishment of a HARQ session between the two devices. Once the HARQ session is established, if the receiving device cannot correctly decode (and cannot correct the errors) the first HARQ transmission received from the transmitting device, the receiving device can send a HARQ feedback message (such as a Negative Acknowledgment (NACK)) to the transmitting device, which indicates that at least a portion of the first HARQ transmission has not been correctly decoded. Such HARQ feedback messages can be different from the traditional block ACK feedback message types associated with conventional ARQ. In response to receiving the HARQ feedback message, the transmitting device can send a second HARQ transmission to the receiving device to convey at least a portion of the first HARQ transmission that further aids the receiving device in decoding. For example, the transmitting device can include some or all of the original information bits, some or all of the original parity bits, and other different parity bits in the second HARQ transmission. The combined HARQ transmissions can be processed for decoding and error correction such that the complete signal associated with the HARQ transmissions can be obtained.

[0077] In some implementations, the receiving device can 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 can reduce the feedback overhead and increase the flexibility of retransmissions by allowing the device to dynamically switch between the ARQ and HARQ protocols during frame exchanges. Some implementations can also allow the multiplexing of communications using ARQ and communications using HARQ.

[0078] The wireless communication system 100 may support fast SCell activation using AP-TRS, which may be triggered by a MAC-CE for activating the SCell. The AP-TRS may be used to accelerate the downlink loop initialization at the UE 115 on the SCell according to one or more coarse or fine AGC, FTL, and TTL operations. In some aspects, the network entity may schedule downlink data on the SCell based on CSI feedback received from the UE 115. However, when periodic CSI reporting is configured for the SCell to be activated, the scheduling of downlink data may be delayed because the UE 115 may have to wait until the next available set of CMR and IMR to perform CSI measurements.

[0079] In some implementations, the UE 115 may receive at least one MAC-CE for activating a second cell (different from the first cell) and triggering an AP-CSI report for the second cell via a set of physical downlink shared channel (PDSCH) resources associated with the first cell. The UE 115 may receive one or more aperiodic reference signals (such as one or more aperiodic CSI-RS or one or more SSB) according to the at least one MAC-CE via at least one AP-CMR / IMR pair associated with the second cell. Accordingly, 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. Accordingly, the UE 115 may activate the second cell and achieve downlink data scheduling on the second cell within a relatively short time span, enabling the UE 115 and the network entity 105 to obtain a higher throughput level by using the second cell for subsequent communications.

[0080] Figure 2 An example signaling diagram 200 supporting CSI reporting techniques for SCell activation is shown. The signaling diagram 200 may implement aspects of the wireless communication system 100 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 the UE 115 as described herein (including reference Figure 1 ). The signaling diagram 200 also includes a network entity 105-a, which may be an example of one or more aspects of the network entity 105 as described herein (including reference Figure 1 ). The UE 115-a and the network entity 105-a may communicate within a coverage area 110-a, which may be as described herein (including reference Figure 1Examples of one or more aspects of the coverage area 110 of (). In the signaling diagram 200, the network entity 105-a may trigger an AP-CSI report for the UE 115-a during the SCell activation process, which may enable the UE 115-a to report CSI with higher efficiency and reduced latency, among other benefits.

[0081] In Figure 2 the example of, the UE 115-a may send the capability information 205 to the network entity 105-a. The capability information 205 may indicate a time slot timing value associated with the downlink synchronization capability of the UE 115-a, such as the threshold number of time slots between the reception of the AP-TRS 215 at the UE 115-a and the completion of the initial downlink synchronization process. The time slot timing value may be an integer between 0 and a threshold value (which may be denoted as T sync,max ), where the threshold value represents the maximum time for the UE 115-a to complete downlink synchronization based on the AP-TRS 215. In other words, the UE 115-a may indicate the time slot timing value as an integer from the set {0, 1, 2,... T sync,max}. For example, if the UE 115-a indicates a time 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 time slot. For a further example, if the UE 115-a indicates a time slot timing value of 1, the network entity 105-a may schedule the AP-CMR / IMR pair 220 in the next time slot after the AP-TRS 215, and if the UE 115-a indicates a time slot timing value of 2, the network entity 105-a may schedule the AP-CMR / IMR pair 220 in two time slots after the AP-TRS 215, and so on. Additionally or alternatively, the network entity 105-a may schedule the AP-CMR / IMR pair 220 based on the downlink resource availability of the network entity 105-a. For example, the network entity 105-a may use or interpret the time slot timing value indicated by the UE 115-a via the capability information 205 as the minimum number of time slots between the AP-TRS 215 and the AP-CMR / IMR pair 220, and may select, identify, determine, or otherwise ascertain during which time slot to actually schedule the AP-CMR / IMR pair 220 based on the downlink resource availability at the network entity 105-a.

[0082] 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 report 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 report 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 use, for example, a slot offset to indicate the second set of time and frequency resource locations relative to the first set of time and frequency resources. 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 the downlink resource availability at the network entity 105-a.

[0083] In some implementations, one or more MAC-CEs 210 (which trigger an AP-CSI report for the UE 115-a during SCell activation) may include an uplink grant 230, and the uplink grant 230 indicates a set of PUSCH resources for the UE 115-a to send the AP-CSI report 225. In some aspects, the uplink grant 230 may include a set of bits (such as a total of 27 bits), which are divided into a 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 report. 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.

[0084] Network entity 105-a may use a time offset, such as a K2 offset, to indicate PUSCH resources allocated by uplink grant 230, and may define a 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 AP-CMR / IMR pair 220, such as the time slot associated with AP-CMR / IMR pair 220. In some other implementations, the time offset may be defined relative to the time slot 3 milliseconds after the UE 115-a transmits HARQ-ACK feedback for one or more PDSCH transmissions carrying one or more MAC-CEs 210 (which may be denoted as time slot n+k+1). For example, for a timing advance command received in an uplink time slot (which may be denoted as uplink time slot n), transmissions other than PUSCH transmissions scheduled by a random access response (RAR) uplink grant or a fallback RAR uplink grant, and PUSCH transmissions having HARQ-ACK feedback information associated with a successful RAR, the corresponding adjustment of the uplink transmission timing may be applied starting from the beginning of uplink time slot n+k+1, where k may be defined according to Equation 1.

[0085] (1)

[0086] In Equation 1, may be the duration of a symbol (in milliseconds) corresponding to the PDSCH processing time for UE processing capabilities when additional PDSCH demodulation reference signals (DMRS) are configured, the duration of a symbol (in milliseconds) corresponding to the PUSCH preparation time for UE processing capabilities, may be the maximum timing advance value (in milliseconds) that may be provided by a 12-bit TA command field, the duration of a symbol (in milliseconds) corresponding to the PUSCH preparation time for UE processing capabilities, may be the maximum timing advance value (in milliseconds) that may be provided by a 12-bit TA command field, may be the number of time slots per subframe, and and may be the subframe duration of 1 millisecond. In some implementations, uplink grant 230 may schedule PUSCH resources on a cell for transmitting one or more MAC-CEs 210 that trigger SCell activation and AP-CSI reporting for UE 115-a, where such a cell may be a PCell or a primary secondary cell (PSCell). Additionally or alternatively, uplink grant 230 may schedule PUSCH resources on another active uplink SCell of UE 115-a or an uplink SCell to be activated for UE 115-a (such as the SCell indicated by an SCell activation command).

[0087] UE 115-a can receive the AP-TRS 215 from the network entity 105-a according to an AP-TRS trigger indicated by one or more MAC-CEs 210, and can use the AP-TRS 215 to perform AGC, FTL, TTL, and other downlink loop initialization procedures for the SCell indicated by the SCell activation command. UE 115-a can receive one or more reference signals via the AP-CMR / IMR pair 220 according to an AP-CSI report trigger indicated by one or more MAC-CEs 210, and can generate the AP-CSI report 225 based on the measurement of the AP-CMR / IMR pair 220. UE 115-a can use the PUSCH resources indicated by the uplink grant 230 to transmit the AP-CSI report 225, and the network entity 105-a can activate the SCell according to the AP-CSI report 225 received from UE 115-a, and start scheduling downlink traffic to UE 115-a on the activated SCell.

[0088] Figure 3 An example resource graph 300 that supports CSI reporting techniques for SCell activation is shown. The resource graph 300 can implement aspects of the wireless communication system 100 or the signaling graph 200 or be implemented by aspects of the wireless communication system 100 or the signaling graph 200. For example, the resource graph 300 can be implemented for communication between the UE 115 and the network entity 105. The UE 115 can be an example of the UE 115 or UE 115-a as Figure 1 and Figure 2 shown and referenced Figure 1 and Figure 2 described. The network entity 105 can be an example of the network entity 105 or network entity 105-a as Figure 1 and Figure 2 shown and referenced Figure 1 and Figure 2 described. The resource graph 300 includes a carrier 305-a (such as an SCell downlink carrier), a carrier 305-b (such as a PCell downlink carrier), and a carrier 305-c (such as a PCell uplink carrier). In the resource graph 300, the UE 115 can receive the SCell activation command 310 and the AP-CSI report trigger 335 from the network entity 105 via one or more MAC-CEs (such as via one or more MAC-CEs 210 as Figure 2 shown and referenced Figure 2 described.

[0089] As described herein (including with reference to Figure 1 andFigure 2 ), PDSCH transmission with MAC-CE for SCell activation can also trigger AP-CSI reporting for the SCell. In some implementations, the AP-CMR / IMR pair 325 (UE 115 can use the AP-CMR / IMR pair 325 to perform CSI measurements associated with the SCell) can be scheduled in the same time slot as the AP-TRS 320 or in a subsequent time slot, where the AP-CMR / IMR pair 325 can be an example of the AP-CMR / IMR pair 220, as Figure 2 shown and referenced Figure 2 as described, and the AP-TRS 320 can be an example of the AP-TRS 215, also as Figure 2 shown and referenced Figure 2 as described. UE 115 can use the AP-CMR / IMR pair 325 to measure CSI and can send the corresponding AP-CSI report 330 on the PUSCH resource set indicated by the AP-CSI report trigger 335. Although indicated to be sent via the PCell, UE 115 can send the AP-CSI report 330 via the activated SCell or another SCell (such as another previously activated SCell) supported by UE 115 and the network entity 105.

[0090] In some implementations, the network entity 105 can send the SCell activation command 310, the AP-TRS trigger, and the AP-CSI report trigger 335 via an integrated MAC-CE. In some other implementations, the network entity 105 can send a first MAC-CE indicating the SCell activation command 310 and the AP-TRS trigger, and can send a second MAC-CE indicating the AP-CSI report trigger 335. In other words, the network entity 105 can include the SCell activation command 310 and the AP-CSI report trigger 335 in the same MAC-CE or different MAC-CEs.

[0091] To facilitate the joint AP-CMR / IMR triggering mechanism disclosed herein, when SCell is enabled for UE 115, network entity 105 may configure multiple AP-CMR / IMR resources for fast CSI reporting. In some implementations, separate AP-CMR / IMR resources may be configured at UE 115 for fast CSI reporting, where the fast CSI reporting may refer to a CSI report triggered by an AP-CSI report trigger 335 sent in the same MAC-CE as the SCell activation command 310 or in a different MAC-CE within a threshold duration from the MAC-CE including the SCell activation command 310. Additionally or alternatively, the AP-CMR / IMR resources configured for a deactivated SCell may be reused for fast CSI reporting at UE 115. In other words, UE 115 may receive a configuration of a set of AP-CMR / IMR resources (such as an RRC configuration), where the set of AP-CMR / IMR resources may be dedicated to fast CSI reporting or shared with other CSI reporting techniques supported by UE 115. In some implementations, one or more MAC-CEs that trigger an AP-CSI report during SCell activation may indicate an AP-CMR / IMR pair 325, and UE 115 may use the one AP-CMR / IMR pair 325 for CSI measurement. For example, UE 115 may be configured with a set of CMRs and a set of IMRs, and the AP-CSI report trigger 335 may indicate one CMR from the set of CMRs and one IMR from the set of IMRs for the triggered CSI measurement.

[0092] UE 115 may send HARQ-ACK feedback information 315 associated with either or both of the SCell activation command 310 and the AP-CSI report trigger 335. For example, if UE receives the SCell activation command 310 and the AP-CSI report trigger 335 in separate MAC-CEs, UE may report HARQ-ACK feedback information 315 for the SCell activation command 310 and the AP-CSI report trigger 335 in separate PUSCH transmissions. Alternatively, if UE receives the SCell activation command 310 and the AP-CSI report trigger 335 via an integrated MAC-CE, UE may report HARQ-ACK feedback information 315 for the SCell activation command 310 and the AP-CSI report trigger 335 in the same PUSCH transmission.

[0093] In some implementations, there may be a duration of approximately 3 milliseconds between the time slot allocated for transmitting HARQ-ACK feedback information 315 and the time slot allocated for transmitting AP-TRS 320. Additionally or alternatively, there may be a time offset between the time slot allocated for transmitting AP-TRS 320 and the time 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, determine, or otherwise ascertain the duration of the time offset between the AP-TRS 320 and the AP-CMR / IMR pair 325 based on the UE's downlink synchronization capability, or the network entity's downlink resource availability, or both.

[0094] Aspects of the subject matter disclosed in the previous description of the resource graph 300 may be implemented to achieve one or more of the following potential advantages. For example, the techniques and signaling mechanisms Figure 3 described may reduce the latency of the SCell activation process by enabling the network entity 105 to jointly activate the SCell and trigger an AP-CSI report for that SCell. More specifically, the network entity may send at least one MAC-CE that indicates an activation command for the SCell and at least one AP-CMR / IMR for AP-CSI measurements associated with the SCell, which may enable the UE to generate and report CSI to the network entity with reduced latency. Thus, the UE may activate the SCell in a relatively short time frame, enabling the UE and the network entity to achieve a higher throughput level by using the activated SCell for subsequent communication.

[0095] Figure 4 An example process flow 400 that supports CSI reporting techniques for SCell activation is shown. The process flow 400 may implement one or more aspects of the wireless communication system 100, the signaling graph 200, or the resource graph 300, or be implemented by one or more aspects of the wireless communication system 100, the signaling graph 200, or the resource graph 300. For example, the process flow 400 includes UE 115-b, which may be an example of one or more aspects of the UE 115 or UE 115-a as shown in Figure 1 and Figure 2 and described with reference to Figure 1 and Figure 2 The process flow 400 also includes network entity 105-b, which may be an example of one or more aspects of the network entity 105 as shown in Figure 1 and Figure 2 and described with reference to Figure 1 and Figure 2Examples of one or more aspects of the described network entity 105 or network entity 105-a. 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 Figure 4 the order shown in the example of).

[0096] At 405, UE 115-b may send capability information (such as, as shown by Figure 2 and referenced Figure 2 the capability information 205 described) to network entity 105-b. The capability information may indicate a threshold duration (such as in terms of the number of time slots) between the reception of AP-TRS and the measurement of AP-CMR / IMR pairs. UE 115-b may signal the threshold duration (which may be referred to as a time slot timing value) as an integer value between 0 and the maximum synchronization value of UE 115-b. Network entity 105-b may use the capability information provided by UE 115-b and the downlink resource availability of network entity 105-b to schedule AP-TRS and AP-CMR / IMR pairs for UE 115-b.

[0097] At 410, UE 115-b may receive one or more MAC-CEs (e.g., as shown by Figure 2 and referenced Figure 2 one or more MAC-CEs 210 described). One or more MAC-CEs may include SCell activation commands (e.g., as shown by Figure 3 and referenced Figure 3 the SCell activation command 310 described), AP-TRS triggers, and AP-CSI report triggers (e.g., as shown by Figure 3 and referenced Figure 3 the AP-CSI report trigger 335 described). In some implementations, network entity 105-b may include an SCell activation command, an AP-TRS trigger, and an AP-CSI report trigger in a single MAC-CE. In some other implementations, network entity 105-b may include an SCell activation command and an AP-CSI report trigger in separate MAC-CEs.

[0098] In some implementations, at 415, UE 115-b may send HARQ-ACK feedback information (such as referenced Figure 3The described HARQ-ACK feedback information 315). The HARQ-ACK feedback information can indicate whether the UE 115-b has successfully received one or more MAC-CEs carrying the SCell activation command, the AP-TRS trigger, and the AP-CSI report trigger. At 420, the UE 115-b can receive at least one AP-TRS from the network entity 105-b according to the AP-TRS trigger indicated by one or more MAC-CEs (e.g., as Figure 3 shown and with reference to Figure 3 the described AP-TRS 320). The UE 115-b can 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.

[0099] At 425, the UE 115-b can perform measurements of at least one reference signal via (such as using) the AP-CMR / IMR pair (such as, as Figure 2 shown and with reference to Figure 2 the described AP-CMR / IMR pair 220 or AP-CMR / IMR pair 325) according to the AP-CSI report trigger indicated by one or more MAC-CEs. The UE 115-b can use the measurements of the at least one reference signal via the AP-CMR / IMR pair to derive or otherwise generate CSI associated with the SCell indicated by the SCell activation command. At 430, the UE 115-b can send an AP-CSI report including or indicating the CSI measurement associated with the SCell. In some implementations, the network entity 105-b can start scheduling downlink traffic on the SCell when receiving the AP-CSI report from the UE 115-b, and can send PDSCH scheduling information to the UE 115-b at 435.

[0100] Aspects of the subject matter disclosed in the foregoing description of process flow 400 can be implemented to achieve one or more of the following potential advantages. For example, with reference to Figure 4The described techniques and signaling mechanisms can reduce the latency of the SCell activation process by enabling network entity 105-b to jointly activate the SCell and trigger an AP-CSI report for the SCell. More specifically, network entity 105-b can send at least one MAC-CE that indicates an activation command for the SCell and at least one AP-CMR / IMR pair for AP-CSI measurements associated with the SCell, which can enable UE115-b to generate and report CSI to the network entity with reduced latency. As a result, UE 115-b can activate the SCell within a relatively short time span, enabling UE 115-b and network entity 105-b to achieve a higher throughput level by using the activated SCell for subsequent communication.

[0101] Figure 5 FIG. 500 is a block diagram of an example device 505 that supports CSI reporting techniques for SCell activation. Device 505 can communicate with one or more network entities (such as one or more components of one or more network entities 105), one or more UEs 115, or any combination thereof (such as wirelessly). Device 505 can include components for two-way voice and data communication, including components for sending and receiving communication, such as communication manager 520, input / output (I / O) controller 510, transceiver 515, antenna 525, memory 530, code 535, and processor 540. These components can be electronically communicated or otherwise (e.g., operatively, communicatively, functionally, electronically, electrically) coupled via one or more buses (e.g., bus 545).

[0102] I / O controller 510 can manage input and output signals for device 505. I / O controller 510 can also manage peripheral devices that are not integrated into device 505. In some implementations, I / O controller 510 can represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 510 can use an operating system (such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®) or another known operating system. Additionally or alternatively, I / O controller 510 can represent a modem, keyboard, mouse, touch screen, or similar device or interact with the above devices. In some implementations, I / O controller 510 can be implemented as part of a processor or processing system (such as processor 540). In some implementations, a user can interact with device 505 via I / O controller 510 or via hardware components controlled by I / O controller 510.

[0103] In some implementations, device 505 may include a single antenna 525. However, in some other implementations, device 505 may have more than one antenna 525, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions. Transceiver 515 may communicate bidirectionally via one or more antennas 525, wired or wireless links as described herein. For example, transceiver 515 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. 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 one or more antennas 525.

[0104] In some implementations, transceiver 515 may include one or more interfaces, such as one or more interfaces coupled to one or more antennas 525 configured to support various receiving or obtaining operations, or one or more interfaces coupled to one or more antennas 525 configured to support various transmitting or output operations, or a combination thereof. In some implementations, transceiver 515 may include or be configured to couple to one or more processors or memory components, which may be operable to execute or support operations based on the received or obtained information or signals, or generate information or other signals for transmission or other output, or any combination thereof. In some implementations, transceiver 515, or transceiver 515 and one or more antennas 525, or transceiver 515 and one or more antennas 525 and one or more processors or memory components (such as, processor 540, or memory 530, or both) may be included in a chip or chip component installed in device 505.

[0105] Memory 530 may include random access memory (RAM) and read-only memory (ROM). Memory 530 may store computer-readable, computer-executable code 535, which includes instructions that, when run by processor 540, cause device 505 to perform the various functions described herein. Code 535 may be stored in a non-transitory computer-readable medium (such as system memory or another type of memory). In some implementations, code 535 may not be directly executable by processor 540, but may cause a computer (such as when compiled and run) to perform the functions described herein. In some implementations, in addition, memory 530 may also contain a basic input / output system (BIOS), which may control basic hardware or software operations, such as interactions with peripheral components or devices.

[0106] Processor 540 may include intelligent hardware devices 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, processor 540 may be configured to operate a memory array using a memory controller. In some other scenarios, the memory controller may be integrated into processor 540. Processor 540 may be configured to run computer-readable instructions stored in a memory such as memory 530 to cause device 505 to perform various functions such as functions or tasks supporting CSI reporting techniques for SCell activation. For example, device 505 or components of device 505 may include processor 540 and memory 530 coupled to processor 540, and processor 540 and memory 530 are configured to perform the 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 an operating system, a virtual machine, or a container instance) that may host functions (such as by executing code 535) to perform the functions of device 505.

[0107] Processor 540 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 505 such as within memory 530. In some implementations, processor 540 may be a component of a processing system. A processing system generally may refer to a system or a series of machines or components that receive input and process the input to produce a set of outputs that may be passed to other systems or components such as device 505, for example. For example, the processing system of device 505 may refer to a system including various other components or sub-components of device 505 such as processor 540, or transceiver 515, or communication manager 520, or a combination of other components or components of device 505. The processing system of device 505 may interface with other components of device 505 and may process information (such as input or signals) received from other components or output information to other components. For example, a chip or a modem of device 505 may include a processing system and one or more interfaces for outputting information, or obtaining information, or both.

[0108] One or more interfaces may be implemented as or otherwise include a first interface configured to output information and a second interface configured to obtain information, or the same interface configured to output information and obtain information, among other implementations. In some implementations, one or more interfaces may refer to an interface between a processing system of a chip or modem and a transmitter such that device 505 can send information output from the chip or modem. Additionally or alternatively, in some implementations, one or more interfaces may refer to an interface between a processing system of a chip or modem and a receiver such that device 505 can obtain information or signal input and can pass the information to the processing system. Those of ordinary skill in the art will readily recognize that the first interface may also obtain information or signal input and the second interface may also output information or signal output.

[0109] According to an example as disclosed herein, communication manager 520 may support wireless communication at a UE. For example, communication manager 520 may be configured to or otherwise support components for receiving at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an AP-CSI report for the second cell. Communication manager 520 may be configured to or otherwise support components for receiving one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. Communication manager 520 may be configured to or otherwise support components for sending an AP-CSI report associated with measurements of one or more aperiodic reference signals.

[0110] In some implementations, to support receiving at least one MAC-CE, communication manager 520 may be configured to or otherwise support components for receiving, via the at least one MAC-CE, a first indication for triggering AP-TRS measurements for the second cell and a second indication for triggering an AP-CSI report for the second cell according to the at least one MAC-CE that activates the second cell, where the at least one MAC-CE is a single MAC-CE, and where receiving one or more aperiodic reference signals via the second resource set is according to the second indication.

[0111] In some implementations, to support receiving at least one MAC-CE, the communication manager 520 may be configured to or otherwise support components for receiving a first MAC-CE that activates a second cell and triggers AP-TRS measurement for the second cell. In some implementations, to support receiving at least one MAC-CE, the communication manager 520 may be configured to or otherwise support components for receiving a second MAC-CE that triggers an AP-CSI report for the second cell, wherein receiving one or more non-periodic reference signals is based on the second MAC-CE.

[0112] In some implementations, the communication manager 520 may be configured to or otherwise support components for receiving an indication of a plurality of non-periodic CMRs and a plurality of non-periodic IMRs associated with a second cell via control signaling, wherein the plurality of non-periodic CMRs and the plurality of non-periodic IMRs include a second resource set.

[0113] In some implementations, the indication of the plurality of non-periodic CMRs and the plurality of non-periodic IMRs indicates that the plurality of non-periodic CMRs and the plurality of non-periodic IMRs are exclusively associated with an AP-CSI report triggered by at least one MAC-CE that activates the second cell. In some implementations, at least one MAC-CE indicates a second resource set from the plurality of non-periodic CMRs and the plurality of non-periodic IMRs, wherein the second resource set includes one non-periodic CMR from the plurality of non-periodic CMRs and one non-periodic IMR from the plurality of non-periodic IMRs.

[0114] In some implementations, the communication manager 520 may be configured to or otherwise support components for receiving at least one AP-TRS via a third resource set associated with the second cell, wherein at least one MAC-CE also triggers at least one AP-TRS, and wherein at least one MAC-CE that triggers an AP-CSI report indicates a time offset between the third resource set and the second resource set.

[0115] In some implementations, the communication manager 520 may be configured to or otherwise support components for sending a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and is associated with the UE's ability to obtain downlink synchronization using at least one AP-TRS, and wherein the second resource set is scheduled according to the downlink resource availability of the network entity.

[0116] In some implementations, if the number of time slots associated with the time offset between the third resource set and the second resource set indicated by the message is zero, the second resource set and the third resource set are scheduled in the same time slot. In some implementations, the communication manager 520 may be configured to or otherwise support components for sending HARQ-ACK feedback for at least one MAC-CE via a fourth resource set associated with a first cell.

[0117] In some implementations, to support sending an AP-CSI report, the communication manager 520 may be configured to or otherwise support components for sending an AP-CSI report via a PUSCH resource set according to the time offset between the PUSCH resource set and the fourth resource set, where at least one MAC-CE triggering the AP-CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0118] In some implementations, to support sending an AP-CSI report, the communication manager 520 may be configured to or otherwise support components for sending an AP-CSI report via a PUSCH resource set according to the time offset between the PUSCH resource set and the second resource set, where at least one MAC-CE triggering the AP-CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0119] In some implementations, to support receiving one or more aperiodic reference signals via the second resource set, the communication manager 520 may be configured to or otherwise support components for measuring CSI via at least one AP-CMR or AP-IMR associated with a second cell.

[0120] In some implementations, the communication manager 520 may be configured to or otherwise support components for receiving downlink scheduling information associated with a second cell according to an AP-CSI report from a UE. In some implementations, the communication manager 520 may be configured to or otherwise support components for receiving at least one downlink message via the second cell according to the downlink scheduling information.

[0121] In some implementations, to support sending an AP-CSI report, the communication manager 520 may be configured to or otherwise support components for sending an AP-CSI report via a PUSCH resource set associated with at least one of a first cell, a second cell, or a third cell activated for a UE.

[0122] In some implementations, communication manager 520 may be configured to perform various operations (e.g., receive, monitor, transmit) using transceiver 515, one or more antennas 525, or any combination thereof, or in cooperation with transceiver 515, one or more antennas 525, or any combination thereof. Although communication manager 520 is shown as a component of transceiver 515, in some implementations, one or more functions described with reference to communication manager 520 may be supported or performed by transceiver 515, processor 540, memory 530, code 535, or any combination thereof. For example, code 535 may include instructions executable by processor 540 to cause device 505 to perform aspects of CSI reporting techniques for SCell activation as described herein, or processor 540 and memory 530 may otherwise be configured to perform or support such operations.

[0123] Figure 6 Block diagram 600 illustrates an example device 605 that supports CSI reporting techniques for SCell activation. Device 605 may communicate with one or more network entities (such as 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, via one or more wireless interfaces, or any combination thereof. Device 605 may include components that support output and acquisition of communication, such as communication manager 620, transceiver 610, antenna 615, memory 625, code 630, and processor 635. These components may be electronically communicative or otherwise (such as operatively, communicatively, functionally, electronically, electrically) coupled via one or more buses, such as bus 640.

[0124] Transceiver 610 may support two-way communication via a wired link, a wireless link, or both, as described herein. In some implementations, transceiver 610 may include a wired transceiver and may communicate bidirectionally with another wired transceiver. Additionally or alternatively, in some implementations, transceiver 610 may include a wireless transceiver and may communicate bidirectionally with another wireless transceiver. In some implementations, device 605 may include one or more antennas 615, which may be capable of (such as concurrently) transmitting or receiving wireless transmissions.

[0125] The transceiver 610 may also include a modem that modulates signals, provides the modulated signals for transmission (such as via one or more antennas 615, via a wired transmitter), receives the modulated signals (such as from one or more antennas 615, from a wired receiver), and demodulates 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 receiving or obtaining operations, or one or more interfaces coupled to one or more antennas 615 configured to support various transmitting or output operations, or a combination thereof.

[0126] In some implementations, the transceiver 610 may include one or more processors or memory components or be configured to be coupled to one or more processors or memory components, and the one or more processors or memory components are operable to execute or support operations according to the received or obtained information or signals, or 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 processor 635, or memory 625, or both) may be included in a chip or chip component installed in the device 605. In some implementations, the transceiver may be operable to support communication via one or more communication links (e.g., communication link 125, backhaul communication link 120, mid-range communication link 162, front-haul communication link 168).

[0127] The memory 625 may include RAM and ROM. The memory 625 may store computer-readable, computer-executable code 630 that includes instructions that, when executed by the processor 635, cause the device 605 to perform the 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 runnable by the processor 635, but may cause a computer (such as when compiled and run) to perform the functions described herein. In some scenarios, in addition, the memory 625 may also contain BIOS, which may control basic hardware or software operations, such as interactions with peripheral components or devices.

[0128] Processor 635 may include intelligent hardware devices such as general-purpose processors, DSPs, ASICs, CPUs, GPUs, FPGAs, microcontrollers, programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof. In some scenarios, processor 635 may be configured to operate a memory array using a memory controller. In some other scenarios, the memory controller may be integrated into processor 635. Processor 635 may be configured to run computer-readable instructions stored in a memory such as memory 625 to cause device 605 to perform various functions such as functions or tasks supporting CSI reporting techniques for SCell activation. For example, device 605 or components of device 605 may include processor 635 and memory 625 coupled to processor 635, and processor 635 and memory 625 are configured to perform the various functions described herein.

[0129] Processor 635 may be an example of a cloud computing platform such as one or more physical nodes and supporting software such as an operating system, virtual machine, or container instance, which may host functions (such as by executing code 630) to perform the functions of device 605. Processor 635 may be any one or more suitable processors capable of executing scripts or instructions of one or more software programs stored in device 605 such as within memory 625. In some implementations, processor 635 may be a component of a processing system. A processing system generally may refer to a system or series of machines or components that receive input and process the input to produce a set of outputs that may be passed to other systems or components such as device 605, for example. For example, the processing system of device 605 may refer to a system including various other components or sub-components of device 605 such as processor 635, or transceiver 610, or communication manager 620, or a combination of other components or components of device 605.

[0130] The processing system of device 605 may interface with other components of device 605 and may process information (such as 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, or obtaining information, or both. One or more interfaces may be implemented as or otherwise include a first interface configured to output information and a second interface configured to obtain information, or the same interface configured to output information and obtain information, and other implementations.

[0131] In some implementations, one or more interfaces may refer to an interface between a processing system of a chip or modem and a transmitter, such that device 605 can send information output from the chip or modem. Additionally or alternatively, in some implementations, one or more interfaces may refer to an interface between a processing system of a chip or modem and a receiver, such that device 605 can obtain information or signal input and can pass the information to the processing system. Those of ordinary skill in the art will readily recognize that the first interface may also obtain information or signal input and the second interface may also output information or signal output.

[0132] In some implementations, bus 640 may support communication within a protocol layer of a protocol stack (such as within the protocol layer). In some implementations, bus 640 may support communication associated with a logical channel of a protocol stack (such as between protocol layers of the protocol stack), which may include communication performed within components of device 605 or communication performed between different components of device 605, where these different components may be co-located or located at different positions (such as where device 605 may refer to a system in which one or more of communication manager 620, transceiver 610, memory 625, code 630, and processor 635 may be located in one component or divided among different components).

[0133] In some implementations, communication manager 620 may manage aspects of communication with core network 130 (such as via one or more wired or wireless backhaul links). For example, communication manager 620 may manage the transmission of data communication for client devices (such as one or more UEs 115). In some implementations, communication manager 620 may manage communication with other network entities 105 and may include a controller or scheduler for collaboratively controlling communication with UEs 115 with other network entities 105. In some implementations, communication manager 620 may support the X2 interface within LTE / LTE-A wireless communication network technology to provide communication between network entities 105.

[0134] According to examples disclosed herein, communication manager 620 may support wireless communication at a network entity. For example, communication manager 620 may be configured to or otherwise support components for transmitting at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an AP-CSI report for the second cell. Communication manager 620 may be configured to or otherwise support components for transmitting one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. Communication manager 620 may be configured to or otherwise support components for receiving an AP-CSI report associated with measurements of one or more aperiodic reference signals.

[0135] In some implementations, to support transmitting at least one MAC-CE, communication manager 620 may be configured to or otherwise support components for transmitting a first indication and a second indication via at least one MAC-CE according to the at least one MAC-CE that activates the second cell, the first indication for triggering an AP-TRS measurement for the second cell, the second indication for triggering an AP-CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein transmitting one or more aperiodic reference signals via the second resource set is according to the second indication.

[0136] In some implementations, to support transmitting at least one MAC-CE, communication manager 620 may be configured to or otherwise support components for transmitting a first MAC-CE that activates the second cell and triggers an AP-TRS measurement for the second cell. In some implementations, to support transmitting at least one MAC-CE, communication manager 620 may be configured to or otherwise support components for transmitting a second MAC-CE that triggers an AP-CSI report for the second cell, wherein transmitting one or more aperiodic reference signals is according to the second MAC-CE.

[0137] In some implementations, communication manager 620 may be configured to or otherwise support components for transmitting an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with a second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include the second resource set.

[0138] In some implementations, the indication of multiple aperiodic CMRs and multiple aperiodic IMRs indicates that the multiple aperiodic CMRs and multiple aperiodic IMRs are exclusively associated with an AP-CSI report triggered by at least one MAC-CE that activates a second cell. In some implementations, at least one MAC-CE indicates a second resource set from the multiple aperiodic CMRs and the multiple aperiodic IMRs, where the second resource set includes one aperiodic CMR from the multiple aperiodic CMRs and one aperiodic IMR from the multiple aperiodic IMRs.

[0139] In some implementations, the communication manager 620 may be configured to or otherwise support components for transmitting at least one AP-TRS via a third resource set associated with a second cell, where at least one MAC-CE also triggers at least one AP-TRS, and where the at least one MAC-CE that triggers the AP-CSI report indicates a time offset between the third resource set and the second resource set.

[0140] In some implementations, the communication manager 620 may be configured to or otherwise support components for receiving a message indicating the number of time slots associated with a time offset between a third resource set and a second resource set, where the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and is associated with the UE's ability to acquire downlink synchronization using at least one AP-TRS, and where the second resource set is scheduled according to the downlink resource availability of a network entity.

[0141] In some implementations, if the message indicates that the number of time slots associated with a time offset between a third resource set and a second resource set is zero, then the second resource set and the third resource set are scheduled in the same time slot. In some implementations, the communication manager 620 may be configured to or otherwise support components for receiving HARQ-ACK feedback for at least one MAC-CE via a fourth resource set associated with a first cell.

[0142] In some implementations, to support receiving an AP-CSI report, the communication manager 620 may be configured to or otherwise support components for receiving an AP-CSI report via a PUSCH resource set according to a time offset between the PUSCH resource set and the fourth resource set, where the at least one MAC-CE that triggers the AP-CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0143] In some implementations, to support receiving AP-CSI reports, communication manager 620 may be configured to or otherwise support components for receiving an AP-CSI report via a PUSCH resource set according to a time offset between the PUSCH resource set and a second resource set, wherein at least one MAC-CE triggering the AP-CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0144] In some implementations, to support transmitting one or more aperiodic reference signals, communication manager 620 may be configured to or otherwise support components for transmitting at least one aperiodic CSI-RS via at least one aperiodic CMR or aperiodic IMR associated with a second cell.

[0145] In some implementations, communication manager 620 may be configured to or otherwise support components for transmitting downlink scheduling information associated with a second cell according to an AP-CSI report. In some implementations, communication manager 620 may be configured to or otherwise support components for transmitting at least one downlink message via the second cell according to the downlink scheduling information.

[0146] In some implementations, to support receiving AP-CSI reports, communication manager 620 may be configured to or otherwise support components for receiving an AP-CSI report via a PUSCH resource set associated with at least one of a first cell, a second cell, or a third cell.

[0147] In some implementations, communication manager 620 may be configured to perform various operations (such as receiving, obtaining, monitoring, outputting, transmitting) using transceiver 610, one or more antennas 615 (such as when applicable), or any combination thereof or otherwise in cooperation with transceiver 610, one or more antennas 615 (such as when applicable), or any combination thereof. Although communication manager 620 is shown as a separate component, in some implementations, one or more functions described with reference to communication manager 620 may be supported or performed by transceiver 610, processor 635, memory 625, code 630, or any combination thereof. For example, code 630 may include instructions executable by processor 635 to cause device 605 to perform aspects of the CSI reporting techniques for SCell activation as described herein, or processor 635 and memory 625 may otherwise be configured to perform or support such operations.

[0148] Figure 7The flowchart shows an example method 700 that supports CSI reporting techniques for SCell activation. The operations of method 700 can be implemented by a UE or its components. For example, the operations of method 700 can be performed by the UE 115 as described with reference to Figures 1 - 5 In some implementations, the UE may execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described functions.

[0149] At 705, the UE may receive at least one MAC-CE via a first resource set associated with a first cell, where the at least one MAC-CE activates a second cell and triggers an AP-CSI report for the second cell. The operation of 705 can be performed according to the examples disclosed herein.

[0150] At 710, the UE may receive one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The operation of 710 can be performed according to the examples disclosed herein.

[0151] At 715, the UE may send an AP-CSI report associated with measurements of one or more aperiodic reference signals. The operation of 715 can be performed according to the examples disclosed herein.

[0152] Figure 8 The flowchart shows an example method 800 that illustrates CSI reporting techniques for SCell activation. The operations of method 800 can be implemented by a network entity or its components. For example, the operations of method 800 can be performed by the network entity 105 as described with reference to Figures 1 - 4 and Figure 6 In some implementations, the network entity may execute a set of instructions to control the functional elements of the network entity to perform the described functions. Additionally or alternatively, the network entity may use dedicated hardware to perform aspects of the described functions.

[0153] At 805, the network entity may send at least one MAC-CE via a first resource set associated with a first cell, where the at least one MAC-CE activates a second cell and triggers an AP-CSI report for the second cell. The operation of 805 can be performed according to the examples disclosed herein.

[0154] At 810, the network entity may send one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE. The operation of 810 can be performed according to the examples disclosed herein.

[0155] At 815, a network entity may receive an AP-CSI report associated with measurements of one or more aperiodic reference signals. The operation of 815 may be performed according to the examples disclosed herein.

[0156] Examples of implementations are described in the numbered clauses below:

[0157] Clause 1: A method for wireless communication at a UE, comprising: receiving at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; receiving one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and transmitting an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0158] Clause 2: The method according to clause 1, wherein receiving the at least one MAC-CE comprises: receiving a first indication and a second indication via the at least one MAC-CE according to the at least one MAC-CE activating the second cell, the first indication for triggering an aperiodic TRS measurement for the second cell, the second indication for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein receiving the one or more aperiodic reference signals via the second resource set is according to the second indication.

[0159] Clause 3: The method according to any one of clauses 1 to 2, wherein receiving the at least one MAC-CE comprises: receiving a first MAC-CE that activates the second cell and triggers an aperiodic TRS measurement for the second cell; and 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.

[0160] Clause 4: The method according to any one of clauses 1 to 3, further comprising: receiving an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and plurality of aperiodic IMRs include the second resource set.

[0161] 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 the aperiodic CSI report triggered by activating the at least one MAC-CE of the second cell.

[0162] Clause 6: The method according to any one of Clauses 4 to 5, wherein the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, and the second resource set includes one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

[0163] Clause 7: The method according to any one of Clauses 1 to 6, further comprising: receiving at least one aperiodic TRS via a third resource set associated with the second cell, wherein the at least one MAC-CE also triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE triggering the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

[0164] Clause 8: The method according to Clause 7, further comprising: sending a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and with the ability of the UE to obtain downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of the network entity.

[0165] Clause 9: The method according to Clause 8, wherein if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, the second resource set and the third resource set are scheduled in the same time slot.

[0166] Clause 10: The method according to any one of Clauses 1 to 9, further comprising: sending HARQ-ACK feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

[0167] Clause 11: The method according to Clause 10, wherein transmitting the aperiodic CSI report includes: transmitting the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and a fourth resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0168] Clause 12: The method according to any one of Clauses 1 to 11, wherein transmitting the aperiodic CSI report includes: transmitting the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and a second resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0169] Clause 13: The method according to any one of Clauses 1 to 12, wherein receiving the one or more aperiodic reference signals via the second resource set includes: measuring CSI via at least one aperiodic CMR or IMR associated with the second cell.

[0170] Clause 14: The method according to any one of Clauses 1 to 13, further comprising: receiving downlink scheduling information associated with the second cell according to the aperiodic CSI report from the UE; and receiving at least one downlink message via the second cell according to the downlink scheduling information.

[0171] Clause 15: The method according to any one of Clauses 1 to 14, wherein transmitting the aperiodic CSI report includes: transmitting the aperiodic CSI report via a PUSCH resource set associated with at least one of the first cell, the second cell, or the third cell activated for the UE.

[0172] Clause 16: A method for wireless communication at a network entity, comprising: transmitting at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; transmitting one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and receiving an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0173] Clause 17: The method according to Clause 16, wherein transmitting the at least one MAC-CE includes: transmitting a first indication and a second indication via the at least one MAC-CE for activating the second cell, the first indication being for triggering an aperiodic TRS measurement for the second cell, the second indication being for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein transmitting the one or more aperiodic reference signals is according to the second indication.

[0174] Clause 18: The method according to any one of Clauses 16 to 17, wherein transmitting the at least one MAC-CE includes: transmitting a first MAC-CE for activating the second cell and triggering an aperiodic TRS measurement for the second cell; and transmitting a second MAC-CE for triggering the aperiodic CSI report for the second cell, wherein transmitting the one or more aperiodic reference signals is according to the second MAC-CE.

[0175] Clause 19: The method according to any one of Clauses 16 to 18, further comprising: transmitting an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include the second resource set.

[0176] Clause 20: The method according to 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 the aperiodic CSI report triggered by the at least one MAC-CE for activating the second cell.

[0177] Clause 21: The method according to any one of Clauses 19 to 20, wherein the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, the second resource set including one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

[0178] Clause 22: The method according to any one of Clauses 16 to 21 further includes: transmitting at least one aperiodic TRS via a third resource set associated with the second cell, wherein the at least one MAC-CE also triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

[0179] Clause 23: The method according to Clause 22 further includes: receiving a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and is associated with the UE's ability to obtain downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of the network entity.

[0180] Clause 24: The method according to Clause 23, wherein if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, the second resource set and the third resource set are scheduled in the same time slot.

[0181] Clause 25: The method according to any one of Clauses 16 to 24 further includes: receiving HARQ-ACK feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

[0182] Clause 26: The method according to Clause 25, wherein receiving the aperiodic CSI report includes: receiving the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the fourth resource set, wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0183] Clause 27: The method according to any one of Clauses 16 to 26, wherein receiving the aperiodic CSI report includes: receiving the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the second resource set, wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0184] Clause 28: The method according to any one of Clauses 16 to 27, wherein transmitting the 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.

[0185] Clause 29: The method according to any one of Clauses 16 to 28, further comprising: transmitting downlink scheduling information associated with the 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.

[0186] Clause 30: The method according to any one of Clauses 16 to 29, wherein receiving the aperiodic CSI report includes: receiving the aperiodic CSI report via a PUSCH resource set associated with at least one of the first cell, the second cell, or the third cell.

[0187] Clause 31: An apparatus for wireless communication at a UE, comprising: one or more interfaces configured to: obtain at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; obtain one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and output an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0188] Clause 32: The apparatus according to Clause 31, wherein, in order to obtain the at least one MAC-CE, the one or more interfaces are configured to: obtain a first indication and a second indication via the at least one MAC-CE according to the at least one MAC-CE activating the second cell, the first indication being for triggering an aperiodic TRS measurement for the second cell, the second indication being for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein obtaining the one or more aperiodic reference signals via the second resource set is according to the second indication.

[0189] Clause 33: The apparatus according to any one of Clauses 31 to 32, wherein, in order to obtain the at least one MAC-CE, the one or more interfaces are configured to: obtain a first MAC-CE that activates a second cell and triggers an aperiodic TRS measurement for the second cell; and obtain a second MAC-CE that triggers the aperiodic CSI report for the second cell, wherein obtaining the one or more aperiodic reference signals is based on the second MAC-CE.

[0190] Clause 34: The apparatus according to any one of Clauses 31 to 33, wherein the one or more interfaces are further configured to: obtain an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include the second resource set.

[0191] Clause 35: The apparatus according to 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 the aperiodic CSI report triggered by the at least one MAC-CE that activates the second cell.

[0192] Clause 36: The apparatus according to any one of Clauses 34 to 35, wherein the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, and the second resource set includes one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

[0193] Clause 37: The apparatus according to any one of Clauses 31 to 36, wherein the one or more interfaces are further configured to: obtain at least one aperiodic TRS via a third resource set 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 that triggers the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

[0194] Clause 38: The apparatus according to Clause 37, wherein the one or more interfaces are further configured to: output a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set, and is associated with the ability of the apparatus to obtain downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of a network entity.

[0195] Clause 39: The apparatus according to Clause 38, wherein if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, the second resource set and the third resource set are scheduled in the same time slot.

[0196] Clause 40: The apparatus according to any one of Clauses 31 to 39, wherein the one or more interfaces are further configured to: output HARQ-ACK feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

[0197] Clause 41: The apparatus according to Clause 40, wherein in order to output the aperiodic CSI report, the one or more interfaces are configured to: output the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the fourth resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0198] Clause 42: The apparatus according to any one of Clauses 31 to 41, wherein in order to output the aperiodic CSI report, the one or more interfaces are configured to: output the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the second resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0199] Clause 43: The apparatus according to any one of Clauses 31 to 42, wherein in order to obtain the one or more aperiodic reference signals via the second resource set, the one or more interfaces are configured to: measure CSI via at least one aperiodic CMR or IMR associated with the second cell.

[0200] Clause 44: The apparatus according to any one of Clauses 31 to 43, wherein the one or more interfaces are further configured to: obtain downlink scheduling information associated with the second cell according to the aperiodic CSI report from the apparatus; and obtain at least one downlink message via the second cell according to the downlink scheduling information.

[0201] Clause 45: The apparatus according to any one of Clauses 31 to 44, wherein, in order to output the aperiodic CSI report, the one or more interfaces are configured to: output the aperiodic CSI report via a PUSCH resource set associated with at least one of the first cell, the second cell, or the third cell activated for the apparatus.

[0202] Clause 46: The apparatus according to any one of Clauses 31 to 45, further comprising: a processing system configured to and capable of performing one or more functions or operations of the apparatus.

[0203] Clause 47: An apparatus for wireless communication at a network entity, comprising: one or more interfaces configured to: output at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; output one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and obtain an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0204] Clause 48: The apparatus according to Clause 47, wherein, in order to output the at least one MAC-CE, the one or more interfaces are configured to: output a first indication and a second indication via the at least one MAC-CE according to the at least one MAC-CE activating the second cell, the first indication for triggering an aperiodic TRS measurement for the second cell, the second indication for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein outputting the one or more aperiodic reference signals via the second resource set is according to the second indication.

[0205] Clause 49: The apparatus according to any one of Clauses 47 to 48, wherein, in order to output the at least one MAC-CE, the one or more interfaces are configured to: output a first MAC-CE that activates the second cell and triggers an aperiodic TRS measurement for the second cell; and output a second MAC-CE that triggers the aperiodic CSI report for the second cell, wherein outputting the one or more aperiodic reference signals is based on the second MAC-CE.

[0206] Clause 50: The apparatus according to any one of Clauses 47 to 49, wherein the one or more interfaces are further configured to: output an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include the second resource set.

[0207] Clause 51: The apparatus according to 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 the aperiodic CSI report triggered by the at least one MAC-CE that activates the second cell.

[0208] Clause 52: The apparatus according to any one of Clauses 50 to 51, wherein the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, and the second resource set includes one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

[0209] Clause 53: The apparatus according to any one of Clauses 47 to 52, wherein the one or more interfaces are further configured to: output at least one aperiodic TRS via a third resource set associated with the second cell, wherein the at least one MAC-CE also triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

[0210] Clause 54: The apparatus according to Clause 53, wherein the one or more interfaces are further configured to: obtain a message indicating a number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set, and is associated with the ability of the UE to acquire downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of the apparatus.

[0211] Clause 55: The apparatus according to Clause 54, wherein if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, the second resource set and the third resource set are scheduled in the same time slot.

[0212] Clause 56: The apparatus according to any one of Clauses 47 to 55, wherein the one or more interfaces are further configured to: obtain HARQ-ACK feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

[0213] Clause 57: The apparatus according to Clause 56, wherein, in order to obtain the aperiodic CSI report, the one or more interfaces are configured to: obtain the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the fourth resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0214] Clause 58: The apparatus according to any one of Clauses 47 to 57, wherein, in order to obtain the aperiodic CSI report, the one or more interfaces are configured to: obtain the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the second resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0215] Clause 59: The apparatus according to any one of Clauses 47 to 58, wherein, in order to output the one or more aperiodic reference signals, 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.

[0216] Clause 60: The apparatus according to any one 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 report; and output at least one downlink message via the second cell according to the downlink scheduling information.

[0217] Clause 61: The apparatus according to any one of Clauses 47 to 60, wherein, in order to obtain the aperiodic CSI report, the one or more interfaces are configured to: obtain the aperiodic CSI report via a PUSCH resource set associated with at least one of the first cell, the second cell, or the third cell.

[0218] Clause 62: The apparatus according to any one of Clauses 47 to 61, further comprising: a processing system configured to and capable of performing one or more functions or operations of the apparatus.

[0219] Clause 63: An apparatus for wireless communication at a UE, comprising: a unit for receiving at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; a unit for receiving one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and a unit for transmitting an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0220] Clause 64: The apparatus according to Clause 63, wherein the unit for receiving the at least one MAC-CE comprises: a unit for receiving a first indication and a second indication via the at least one MAC-CE according to the at least one MAC-CE activating the second cell, the first indication for triggering an aperiodic TRS measurement for the second cell, the second indication for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein receiving the one or more aperiodic reference signals via the second resource set is according to the second indication.

[0221] Clause 65: The apparatus according to any one of Clauses 63 to 64, wherein the unit for receiving the at least one MAC-CE comprises: a unit for receiving a first MAC-CE for activating the second cell and triggering an aperiodic TRS measurement for the second cell; and a unit for receiving a second MAC-CE for triggering the aperiodic CSI report for the second cell, wherein receiving the one or more aperiodic reference signals is based on the second MAC-CE.

[0222] Clause 66: The apparatus according to any one of Clauses 63 to 65, further comprising: a unit for receiving an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprise the second resource set.

[0223] Clause 67: The apparatus according to 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 the aperiodic CSI report triggered by the at least one MAC-CE for activating the second cell.

[0224] Clause 68: The apparatus according to any one of Clauses 66 to 67, wherein the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, the second resource set comprising one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

[0225] Clause 69: The apparatus according to any one of Clauses 63 to 68, further comprising: a unit for receiving at least one aperiodic TRS via a third resource set 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 for triggering the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

[0226] Clause 70: The apparatus according to Clause 69 further comprises: a unit for sending a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set, and is associated with the ability of the UE to acquire downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of a network entity.

[0227] Clause 71: The apparatus according to Clause 70, wherein if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, the second resource set and the third resource set are scheduled in the same time slot.

[0228] Clause 72: The apparatus according to any one of Clauses 63 to 71 further comprises: a unit for sending HARQ-ACK feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

[0229] Clause 73: The apparatus according to Clause 72, wherein the unit for sending the aperiodic CSI report comprises: a unit for sending the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the fourth resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0230] Clause 74: The apparatus according to any one of Clauses 63 to 73, wherein the unit for sending the aperiodic CSI report comprises: a unit for sending the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the second resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0231] Clause 75: The apparatus according to any one of Clauses 63 to 74, wherein the unit for receiving the one or more aperiodic reference signals via the second resource set comprises: a unit for measuring CSI via at least one aperiodic CMR or IMR associated with the second cell.

[0232] Clause 76: The apparatus according to any one of Clauses 63 to 75 further comprises: a unit for receiving downlink scheduling information associated with the second cell according to the aperiodic CSI report from the UE; and a unit for receiving at least one downlink message via the second cell according to the downlink scheduling information.

[0233] Clause 77: The apparatus according to any one of Clauses 63 to 76, wherein the unit for transmitting the aperiodic CSI report comprises: a unit for transmitting the aperiodic CSI report via a PUSCH resource set associated with at least one of the first cell, the second cell, or the third cell activated for the UE.

[0234] Clause 78: An apparatus for wireless communication at a network entity, comprising: a unit for transmitting at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; a unit for transmitting one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and a unit for receiving an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0235] Clause 79: The apparatus according to Clause 78, wherein the unit for transmitting the at least one MAC-CE comprises: a unit for transmitting a first indication and a second indication via the at least one MAC-CE according to the at least one MAC-CE activating the second cell, the first indication for triggering an aperiodic TRS measurement for the second cell, the second indication for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein transmitting the one or more aperiodic reference signals via the second resource set is according to the second indication.

[0236] Clause 80: The apparatus according to any one of Clauses 78 to 79, wherein the unit for transmitting the at least one MAC-CE comprises: a unit for transmitting a first MAC-CE activating the second cell and triggering an aperiodic TRS measurement for the second cell; and a unit for transmitting a second MAC-CE triggering the aperiodic CSI report for the second cell, wherein transmitting the one or more aperiodic reference signals is according to the second MAC-CE.

[0237] Clause 81: The device according to any one of Clauses 78 to 80 further comprises: a unit for sending an indication of a plurality of aperiodic CMRs and a plurality of aperiodic IMRs associated with the second cell via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs comprise the second resource set.

[0238] Clause 82: The apparatus according to 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 the aperiodic CSI report triggered by the at least one MAC-CE that activates the second cell.

[0239] Clause 83: The apparatus according to any one of Clauses 81 to 82, wherein the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, and the second resource set comprises one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

[0240] Clause 84: The apparatus according to any one of Clauses 78 to 83 further comprises: a unit for sending at least one aperiodic TRS via a third resource set associated with the second cell, wherein the at least one MAC-CE also triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

[0241] Clause 85: The apparatus according to Clause 84 further comprises: a unit for receiving a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and is associated with the UE's ability to acquire downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of the network entity.

[0242] Clause 86: The apparatus according to Clause 85, wherein if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, the second resource set and the third resource set are scheduled in the same time slot.

[0243] Clause 87: The apparatus according to any one of Clauses 78 to 86 further comprises: a unit for receiving HARQ-ACK feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

[0244] Clause 88: The apparatus according to Clause 87, wherein the unit for receiving the aperiodic CSI report comprises: a unit for receiving the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the fourth resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

[0245] Clause 89: The apparatus according to any one of Clauses 78 to 88, wherein the unit for receiving the aperiodic CSI report comprises: a unit for receiving the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the second resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

[0246] Clause 90: The apparatus according to any one of Clauses 78 to 89, wherein the unit for transmitting the one or more aperiodic reference signals comprises: a unit for transmitting at least one aperiodic CSI-RS via at least one aperiodic CMR or IMR associated with the second cell.

[0247] Clause 91: The apparatus according to any one of Clauses 78 to 90 further comprises: a unit for transmitting downlink scheduling information associated with the second cell according to the aperiodic CSI report; and a unit for transmitting at least one downlink message via the second cell according to the downlink scheduling information.

[0248] Clause 92: The apparatus according to any one of Clauses 78 to 91, wherein the unit for receiving the aperiodic CSI report comprises: a unit for receiving the aperiodic CSI report via a PUSCH resource set associated with at least one of the first cell, the second cell, or the third cell.

[0249] Clause 93: A non-transitory computer-readable medium storing code for wireless communication at a UE, the code including instructions executable by a processor to: receive at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; receive one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and transmit an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0250] Clause 94: A non-transitory computer-readable medium storing code for wireless communication at a network entity, the code including instructions executable by a processor to: transmit at least one MAC-CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic CSI report for the second cell; transmit one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and receive an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

[0251] As used herein, the term "determine" or "determining" encompasses a variety of actions, and thus "determine" can include computing, calculating, processing, deriving, investigating, looking up (such as looking up in a table, database, or other data structure), inferring, ascertaining, etc. Further, "determine" can include receiving (such as receiving information), accessing (such as accessing data in a memory), etc. Further, "determine" can include resolving, selecting, picking, establishing, and other such similar actions.

[0252] As used herein, the phrase referring to "at least one" of a list of items refers to any combination of those items, including a single member. By way of example, "at least one of a, b, or c" is intended to cover: a, b, c, a - b, a - c, b - c, and a - b - c.

[0253] The various illustrative logical, logical block, modules, circuits, and algorithmic processes described in connection with the implementations disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. The interchangeability of hardware and software has been generally described in terms of functionality and illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system.

[0254] Hardware and data processing apparatus for implementing the various illustrative logics, logic blocks, modules, and circuits described in connection with the aspects disclosed herein can be implemented or performed using a general-purpose single-chip or multi-chip processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor can be a microprocessor or any processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and one or more microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration. In some implementations, specific processes and methods can be performed by circuitry specific to a given function.

[0255] In one or more aspects, the described functions can be implemented using hardware, digital electronic circuits, computer software, firmware (including the structures disclosed in this specification and their structural equivalents), or any combination thereof. Implementations of the subject matter described in this specification can also be implemented as one or more computer programs (such 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.

[0256] If implemented in software, the functions can be stored on a computer-readable medium or transmitted using one or more instructions or codes of a computer-readable medium. The processes of the methods or algorithms disclosed herein can be implemented in a processor-executable software module that can reside on a computer-readable medium. Computer-readable media includes both computer storage media and communication media, and communication media includes any medium that can facilitate the transfer of a computer program from one location to another. Storage media can be any available medium that can be accessed by a computer. By way of example and not limitation, such computer-readable media can 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 the desired program code in the form of instructions or data structures and that can be accessed by a computer. Additionally, any connection can be properly termed a computer-readable medium. As used herein, disk and optical disk include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk, and Blu-ray disk. Disk can magnetically reproduce data, and optical disk can optically reproduce data using lasers. Combinations of the above should also be included within the scope of computer-readable media. Additionally, operations of a method or algorithm can reside as one or any combination or collection of codes and instructions on a machine-readable medium and a computer-readable medium, which can be incorporated into a computer program product.

[0257] Various modifications to the implementations described in this disclosure may be 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. Accordingly, the claims are not intended to be limited to the implementations shown herein but are to be accorded the widest scope consistent with the disclosure, the principles and features disclosed herein.

[0258] In addition, those of ordinary skill in the art will readily recognize that, for ease of description of the figures, the terms "upper" and "lower" are sometimes used, and the terms "upper" and "lower" indicate relative positions corresponding to the orientation of the figures on a correctly oriented page and may not reflect the correct orientation of any device as implemented.

[0259] Certain features that are described in the context of separate implementations in this specification may also be implemented in combination in a single implementation. Conversely, the various features described in the context of a single implementation may also be implemented separately or in any suitable sub-combination in multiple implementations. Further, although the features may be described above as acting in some combinations and even initially claimed as such, one or more features from the claimed combination may be removed from the combination, and the claimed combination may relate to a sub-combination or a variation of a sub-combination.

[0260] Similarly, although the operations are depicted in the figures in a particular order, this should not be construed as requiring that such operations be performed in the particular order shown or in a sequential order, or that all of the illustrated operations be performed to achieve the desired result. Further, the figures may schematically depict one or more example processes in the form of a flowchart. However, other operations not depicted may be incorporated into the example processes not schematically shown. For example, one or more additional operations may be performed before, after, concurrently with, or between any of the operations shown. In some cases, multitasking and parallel processing may be advantageous. Additionally, the separation of the various system components in the implementations described above should not be construed as requiring such separation in all implementations, but rather should be understood that the described program components and systems can generally be integrated together in a single software product or encapsulated into 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 the desired result.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: one or more interfaces configured to: obtain at least one medium access control (MAC)-control element (CE) via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic channel state information (CSI) report for the second cell; obtain one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and output an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

2. The apparatus according to claim 1, wherein, to obtain the at least one MAC-CE, the one or more interfaces are configured to: obtain a first indication and a second indication via the at least one MAC-CE according to the at least one MAC-CE activating the second cell, the first indication being for triggering an aperiodic tracking reference signal (TRS) measurement for the second cell, the second indication being for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein obtaining the one or more aperiodic reference signals via the second resource set is according to the second indication.

3. The apparatus according to claim 1, wherein, to obtain the at least one MAC-CE, the one or more interfaces are configured to: obtain a first MAC-CE that activates the second cell and triggers an aperiodic tracking reference signal (TRS) measurement for the second cell; and obtain a second MAC-CE that triggers the aperiodic CSI report for the second cell, wherein obtaining the one or more aperiodic reference signals is according to the second MAC-CE.

4. The apparatus according to claim 1, wherein, the one or more interfaces are further configured to: obtain 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 via control signaling, wherein the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include the second resource set.

5. The apparatus according to claim 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 the aperiodic CSI report triggered by the at least one MAC-CE activating the second cell.

6. The apparatus according to claim 4, wherein, the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, and wherein the second resource set includes one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

7. The apparatus according to claim 1, wherein, the one or more interfaces are further configured to: obtain at least one aperiodic Tracking Reference Signal (TRS) via a third resource set associated with the second cell, wherein the at least one MAC Control Element (MAC-CE) further triggers the at least one aperiodic TRS, and wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

8. The apparatus according to claim 7, wherein, the one or more interfaces are further configured to: output a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set, and is associated with the ability of the apparatus to acquire downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of a network entity.

9. The apparatus according to claim 8, wherein, if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, then the second resource set and the third resource set are scheduled in the same time slot.

10. The apparatus according to claim 1, wherein, the one or more interfaces are further configured to: output a Hybrid Automatic Repeat reQuest - Acknowledgement (HARQ-ACK) feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

11. The apparatus according to claim 10, wherein, for outputting the aperiodic CSI report, the one or more interfaces are configured to: output the aperiodic CSI report via the Physical Uplink Shared Channel (PUSCH) resource set according to a time offset between the PUSCH resource set and the fourth resource set, wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

12. The apparatus according to claim 1, wherein, for outputting the aperiodic CSI report, the one or more interfaces are configured to: output the aperiodic CSI report via the PUSCH resource set according to a time offset between the PUSCH resource set and the second resource set, wherein the at least one MAC-CE that triggers the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

13. The apparatus according to claim 1, wherein, for obtaining the one or more aperiodic reference signals via the second resource set, the one or more interfaces are configured to: Measure channel state information CSI via at least one aperiodic channel measurement resource CMR or interference measurement resource IMR associated with the second cell.

14. The apparatus according to claim 1, wherein, the one or more interfaces are further configured to: obtain downlink scheduling information associated with the second cell according to the aperiodic CSI report from the apparatus; and obtain at least one downlink message via the second cell according to the downlink scheduling information.

15. The apparatus according to claim 1, wherein, in order to output the aperiodic CSI report, the one or more interfaces are 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 apparatus.

16. An apparatus for wireless communication at a network entity, comprising: one or more interfaces configured to: output at least one medium access control MAC-control element CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic channel state information CSI report for the second cell; output one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and obtain an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

17. The apparatus according to claim 16, wherein, in order to output the at least one MAC-CE, the one or more interfaces are configured to: output a first indication and a second indication via the at least one MAC-CE according to the at least one MAC-CE activating the second cell, the first indication for triggering an aperiodic tracking reference signal TRS measurement for the second cell, the second indication for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein outputting the one or more aperiodic reference signals via the second resource set is according to the second indication.

18. The apparatus according to claim 16, wherein, in order to output the at least one MAC-CE, the one or more interfaces are configured to: output a first MAC-CE that activates the second cell and triggers an aperiodic tracking reference signal TRS measurement for the second cell; and output a second MAC-CE that triggers the aperiodic CSI report for the second cell, wherein outputting the one or more aperiodic reference signals is according to the second MAC-CE.

19. The apparatus according to claim 16, wherein, the one or more interfaces are further configured to: Output 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 via control signaling, where the plurality of aperiodic CMRs and the plurality of aperiodic IMRs include the second resource set.

20. The apparatus according to claim 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 the aperiodic CSI report triggered by the at least one MAC-CE that activates the second cell.

21. The apparatus according to claim 19, wherein: the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, and the second resource set includes one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

22. The apparatus according to claim 16, wherein, the one or more interfaces are further configured to: output at least one aperiodic tracking reference signal (TRS) via a third resource set associated with the second cell, where the at least one MAC-CE also triggers the at least one aperiodic TRS, and where the at least one MAC-CE that triggers the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

23. The apparatus according to claim 22, wherein, the one or more interfaces are further configured to: obtain a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, where the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and is associated with the ability of a user equipment (UE) to use the at least one aperiodic TRS to acquire downlink synchronization, and where the second resource set is scheduled according to the downlink resource availability of the apparatus.

24. The apparatus according to claim 23, wherein, if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, then the second resource set and the third resource set are scheduled in the same time slot.

25. The apparatus according to claim 16, wherein, the one or more interfaces are further configured to: obtain a hybrid automatic repeat request (HARQ)-acknowledgment (ACK) feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

26. The apparatus according to claim 25, wherein, to obtain the aperiodic CSI report, the one or more interfaces are configured to: Obtain the aperiodic CSI report via the PUSCH resource set according to a time offset between the physical uplink shared channel PUSCH resource set and the fourth resource set, where the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

27. The apparatus according to claim 16, wherein, To obtain the aperiodic CSI report, the one or more interfaces are configured to: Obtain the aperiodic CSI report via the PUSCH resource set according to a time offset between the physical uplink shared channel PUSCH resource set and the second resource set, where the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

28. The apparatus according to claim 16, wherein, To output the one or more aperiodic reference signals, the one or more interfaces are configured to: Output at least one aperiodic CSI reference signal CSI-RS via at least one aperiodic channel measurement resource CMR or interference measurement resource IMR associated with the second cell.

29. The apparatus according to claim 16, wherein, The one or more interfaces are further configured to: Output downlink scheduling information associated with the second cell according to the aperiodic CSI report; and Output at least one downlink message via the second cell according to the downlink scheduling information.

30. The apparatus according to claim 16, wherein, To obtain the aperiodic CSI report, the one or more interfaces are configured to: Obtain the aperiodic CSI report via a physical uplink shared channel PUSCH resource set associated with at least one of the first cell, the second cell, or the third cell.

31. A method for wireless communication at a user equipment UE, comprising: Receiving at least one media access control MAC-control element CE via a first resource set associated with a first cell, the at least one MAC-CE activating a second cell and triggering an aperiodic channel state information CSI report for the second cell; Receiving one or more aperiodic reference signals via a second resource set associated with the second cell according to the at least one MAC-CE; and Sending an aperiodic CSI report associated with measurement of the one or more aperiodic reference signals.

32. The method according to claim 31, wherein, Receiving the at least one MAC-CE includes: Receiving, according to the at least one MAC-CE that activates the second cell, a first indication and a second indication via the at least one MAC-CE, the first indication being used to trigger an aperiodic Tracking Reference Signal (TRS) measurement for the second cell, and the second indication being used to trigger the aperiodic CSI report for the second cell, wherein the at least one MAC-CE is a single MAC-CE, and wherein receiving the one or more aperiodic reference signals via the second resource set is according to the second indication.

33. The method according to claim 31, wherein, receiving the at least one MAC-CE includes: receiving a first MAC-CE that activates the second cell and triggers an aperiodic Tracking Reference Signal (TRS) measurement for the second cell; and 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.

34. The method according to claim 31, further comprising: receiving, 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 plurality of aperiodic CMRs and the plurality of aperiodic IMRs include the second resource set.

35. The method according to claim 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 the aperiodic CSI report triggered by the at least one MAC-CE that activates the second cell.

36. The method according to claim 34, wherein, the at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, wherein the second resource set includes one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

37. The method according to claim 31, further comprising: receiving at least one aperiodic Tracking Reference Signal (TRS) via a third resource set 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 that triggers the aperiodic CSI report indicates a time offset between the third resource set and the second resource set.

38. The method according to claim 37, further comprising: Send a message indicating the number of time slots associated with the time offset between the third resource set and the second resource set, where the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and is associated with the ability of the UE to obtain downlink synchronization using the at least one aperiodic TRS, and where the second resource set is scheduled according to the downlink resource availability of a network entity.

39. The method according to claim 38, wherein, if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, then the second resource set and the third resource set are scheduled in the same time slot.

40. The method according to claim 31, further comprising: Sending a hybrid automatic repeat request HARQ-acknowledgment ACK feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

41. The method according to claim 40, wherein, sending the aperiodic CSI report comprises: Sending the aperiodic CSI report via the PUSCH resource set according to a time offset between a physical uplink shared channel PUSCH resource set and the fourth resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

42. The method according to claim 31, wherein, sending the aperiodic CSI report comprises: Sending the aperiodic CSI report via the PUSCH resource set according to a time offset between a physical uplink shared channel PUSCH resource set and the second resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

43. The method according to claim 31, wherein, receiving the one or more aperiodic reference signals via the second resource set comprises: Measuring channel state information CSI via at least one aperiodic channel measurement resource CMR or interference measurement resource IMR associated with the second cell.

44. The method according to claim 31, further comprising: Receiving downlink scheduling information associated with the second cell according to the aperiodic CSI report from the UE; and Receiving at least one downlink message via the second cell according to the downlink scheduling information.

45. The method according to claim 31, wherein, sending the aperiodic CSI report comprises: The aperiodic CSI report is sent 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 UE.

46. A method for wireless communication at a network entity, comprising: sending at least one medium access control MAC - control element CE via a first set of resources associated with a first cell, the at least one MAC - CE activating a second cell and triggering an aperiodic channel state information CSI report for the second cell; sending 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; and receiving an aperiodic CSI report associated with measurements of the one or more aperiodic reference signals.

47. The method according to claim 46, wherein sending the at least one MAC - CE comprises: sending a first indication and a second indication via the at least one MAC - CE according to the at least one MAC - CE activating the second cell, the first indication for triggering an aperiodic tracking reference signal TRS measurement for the second cell, the second indication for triggering the aperiodic CSI report for the second cell, wherein the at least one MAC - CE is a single MAC - CE, and wherein sending the one or more aperiodic reference signals via the second set of resources is according to the second indication.

48. The method according to claim 46, wherein sending the at least one MAC - CE comprises: sending a first MAC - CE that activates the second cell and triggers an aperiodic tracking reference signal TRS measurement for the second cell; and sending a second MAC - CE that triggers the aperiodic CSI report for the second cell, wherein sending the one or more aperiodic reference signals is according to the second MAC - CE.

49. The method according to claim 46, further comprising: sending an indication of a plurality of aperiodic channel measurement resources CMR and a plurality of aperiodic interference measurement resources IMR associated with the second cell via control signaling, wherein the plurality of aperiodic CMR and the plurality of aperiodic IMR include the second set of resources.

50. The method according to claim 49, wherein the indication of the plurality of aperiodic CMR and the plurality of aperiodic IMR indicates that the plurality of aperiodic CMR and the plurality of aperiodic IMR are exclusively associated with the aperiodic CSI report triggered by the at least one MAC - CE activating the second cell.

51. The method according to claim 49, wherein The at least one MAC-CE indicates the second resource set from the plurality of aperiodic CMRs and the plurality of aperiodic IMRs, wherein the second resource set includes one aperiodic CMR from the plurality of aperiodic CMRs and one aperiodic IMR from the plurality of aperiodic IMRs.

52. The method according to claim 46, further comprising: sending at least one aperiodic tracking reference signal (TRS) via a third resource set 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 report indicates a time offset between the third resource set and the second resource set.

53. The method according to claim 52, further comprising: receiving a message indicating a number of time slots associated with the time offset between the third resource set and the second resource set, wherein the number of time slots is associated with a threshold duration of the time offset between the third resource set and the second resource set and is associated with the ability of a user equipment (UE) to acquire downlink synchronization using the at least one aperiodic TRS, and wherein the second resource set is scheduled according to the downlink resource availability of the network entity.

54. The method according to claim 53, wherein, if the message indicates that the number of time slots associated with the time offset between the third resource set and the second resource set is zero, the second resource set and the third resource set are scheduled in the same time slot.

55. The method according to claim 46, further comprising: receiving a hybrid automatic repeat request (HARQ)-acknowledgment (ACK) feedback for the at least one MAC-CE via a fourth resource set associated with the first cell.

56. The method according to claim 55, wherein, receiving the aperiodic CSI report comprises: receiving the aperiodic CSI report via the PUSCH resource set according to a time offset between a physical uplink shared channel (PUSCH) resource set and the fourth resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the fourth resource set.

57. The method according to claim 46, wherein, receiving the aperiodic CSI report comprises: receiving the aperiodic CSI report via the PUSCH resource set according to a time offset between a physical uplink shared channel (PUSCH) resource set and the second resource set, wherein the at least one MAC-CE triggering the aperiodic CSI report indicates the PUSCH resource set and the time offset between the PUSCH resource set and the second resource set.

58. The method according to claim 46, wherein, sending the one or more aperiodic reference signals includes: sending at least one aperiodic CSI reference signal (CSI-RS) via at least one aperiodic channel measurement resource (CMR) or interference measurement resource (IMR) associated with the second cell.

59. The method according to claim 46, further comprises: sending downlink scheduling information associated with the second cell according to the aperiodic CSI report; and sending at least one downlink message via the second cell according to the downlink scheduling information.

60. The method according to claim 46, wherein, receiving the aperiodic CSI report includes: receiving 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.

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