Signaling details for temporary reference signal based secondary cell activation - Patents.com

Abstract

Certain aspects of the present disclosure provide techniques for a method for wireless communication by a user equipment (UE) that includes receiving radio resource control (RRC) signaling to configure the UE with one or more per-carrier reference signal (RS) configurations, activating a secondary cell and receiving dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations, and monitoring a temporary RS on the secondary cell based at least in part on the at least one of the one or more RS configurations indicated by the dynamic signaling.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of and priority to U.S. Application No. 63 / 275,821, filed November 4, 2021, which is assigned to the assignee of this application and which is expressly incorporated by reference in its entirety herein as if fully set forth below and for all applicable purposes.

[0002] Introduction Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for monitoring a Temporary Reference Signal (Temp RS) on a Secondary Cell (SCell) based on a Reference Signal (RS) configuration.

[0003]

[0003] Wireless communication systems have been widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcast, or other similar types of services. These wireless communication systems may employ multiple access techniques capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, or other resources) with these users. The multiple access techniques may rely on any of the following, to name just a few: code division, time division, frequency division orthogonal frequency division, single carrier frequency division, or time division synchronous code division. These and other multiple access techniques have been adopted in various telecommunication standards to provide a common protocol that allows different wireless devices to communicate at city, national, regional, and even global levels.

[0004]

[0004] Although wireless communication systems have made great technological advances over the years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers, undermining the various established wireless channel measurement and reporting mechanisms used to manage and optimize the use of finite wireless channel resources. Therefore, further improvements in wireless communication systems are needed to overcome various challenges. Summary of the Invention

[0005]

[0005] One aspect provides a method for wireless communication by a User Equipment (UE). The method generally includes receiving Radio Resource Control (RRC) signaling to configure the UE with one or more per-carrier Reference Signal (RS) configurations, receiving dynamic signaling to activate a secondary cell and indicate at least one of the one or more per-carrier RS ​​configurations, and monitoring a temporary RS on the secondary cell based at least in part on the at least one of the one or more RS configurations indicated by the dynamic signaling.

[0006]

[0006] One aspect provides a method for wireless communication by a network entity. The method generally includes transmitting radio resource control (RRC) signaling to configure a user equipment (UE) with one or more per-carrier reference signal (RS) configurations, and transmitting dynamic signaling to activate a secondary cell and indicate at least one of the one or more per-carrier RS ​​configurations.

[0007]

[0007] Other aspects provide an apparatus operable, configured or otherwise adapted to perform the above-mentioned method as well as methods described elsewhere herein, a non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of the apparatus, cause the apparatus to perform the above-mentioned method as well as methods described elsewhere herein, a computer program product embodied on a computer-readable storage medium comprising code for performing the above-mentioned method as well as methods described elsewhere herein, and an apparatus comprising means for performing the above-mentioned method as well as methods described elsewhere herein. By way of example, the apparatus may comprise a processing system, a device having a processing system, or a processing system cooperating via one or more networks.

[0008]

[0008] The following description and the annexed drawings set forth certain features for purposes of illustration. [Brief description of the drawings]

[0009]

[0009] The accompanying drawings illustrate certain features of the various aspects described herein and should not be considered as limiting the scope of the disclosure.

[0010] [Figure 1]

[0010] FIG. 1 is a block diagram conceptually illustrating an example wireless communications network. [Diagram 2]

[0011] FIG. 2 is a block diagram conceptually illustrating example aspects of a network entity and user equipment. [Figure 3A]

[0012] 1 illustrates various example aspects of data structures for a wireless communication network. [Figure 3B] 1 illustrates various example aspects of data structures for a wireless communication network. [Figure 3C] 1 illustrates various example aspects of data structures for a wireless communication network. [Figure 3D] 1 illustrates various example aspects of data structures for a wireless communication network. [Figure 4]

[0013] FIG. 1 illustrates an example Channel State Information (CSI) resource configuration. [Diagram 5]

[0014] 1 illustrates an example timeline of secondary cell (SCell) activation based on a temporary reference signal (RS). [Figure 6A]

[0015] 1 shows an example timeline of different options for triggering a temporary RS for SCell activation. [Figure 6B] 1 shows an example timeline of different options for triggering a temporary RS for SCell activation. [Figure 7]

[0016] The timeline of the temporary RS is shown. [Figure 8]

[0017] 1 is a call flow diagram illustrating a first example of temporary RS-based SCell activation in accordance with certain aspects of the present disclosure. [Figure 9]

[0018] 13 is a call flow diagram illustrating a second example of temporary RS-based SCell activation in accordance with certain aspects of the present disclosure. [Figure 10]

[0019] FIG. 1 illustrates an example of a CSI resource configuration in accordance with certain aspects of the present disclosure. [Figure 11]

[0020] 1 illustrates example operations for wireless communication by a UE in accordance with certain aspects of the present disclosure. [Figure 12]

[0021] 1 illustrates example operations for wireless communication by a network entity in accordance with certain aspects of the present disclosure. [Figure 13]

[0022] 1 illustrates example operations for wireless communication by a UE in accordance with certain aspects of the present disclosure. [Figure 14]

[0023] 1 illustrates example operations for wireless communication by a network entity in accordance with certain aspects of the present disclosure. [Figure 15]

[0024] 1 illustrates aspects of an exemplary communications device. [Figure 16]

[0025] 1 illustrates aspects of an exemplary communications device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011]

[0026] Aspects of the present disclosure provide an apparatus, a method, a processing system, and a computer-readable medium for a UE to determine a temporary reference signal (RS) to monitor on a secondary cell (SCell) based on an RS configuration.

[0012]

[0027] Some wireless communication systems support different cell types, such as a Primary Cell (PCell) type and a Secondary Cell (SCell) type. A Primary Cell generally refers to a cell on which a User Equipment (UE) performs an initial connection establishment procedure and initiates a connection re-establishment procedure, or a cell designated as a primary cell in a handover procedure. A SCell generally refers to a cell operating on a different frequency than the primary cell, which may be configured once a Radio Resource Control (RRC) connection is established and may be used to provide additional radio resources.

[0013]

[0028] After a UE receives a command to activate a SCell, there may be a delay until the UE can monitor reference signals, called Synchronization Signal Blocks (SSBs), which the UE uses to adjust its time and frequency tracking before sending a Channel State Information (CSI) report. This delay may be significant, since there may be relatively long periods between SSBs. In some cases, to reduce this delay, a non-periodic temporary reference signal (Temporary RS) may be transmitted earlier than the next SSB after SCell activation. The earlier timing of this Temporary RS may allow the UE to make measurements on the SCell and send CSI reports earlier than if it had to wait for the subsequent SSB.

[0014]

[0029] In this way, the use of temporary RSs can reduce the SCell activation delay and enable efficient use of SCells for data traffic. One challenge with temporary RS-based SCell activation is how to configure the UE with details of the temporary RSs and how to indicate the triggering of the temporary RSs to the UE. In other words, the challenge is how to indicate which temporary RSs the UE should monitor on the SCell after receiving an indication that the SCell should be activated.

[0015]

[0030] A first option to address this challenge is to define a new set of RRC parameters to configure the temporary RS and to use a corresponding new Medium Access Control (MAC) Control Element (CE) to trigger the temporary RS. Unfortunately, this option may involve extra specification work to define the signaling of parameters that may be similar to existing parameters, resulting in duplication of work and increased signaling overhead due to the fact that all RRC parameters related to triggering the temporary RS have to be replicated for each carrier.

[0016]

[0031] A second option is to reuse existing RRC parameters for aperiodic CSI-RS and / or Tracking Reference Signal (TRS). Unfortunately, trigger conditions (for activating aperiodic CSI-RS / TRS) are usually configured for all carriers (not just SCell carriers), which leads to low flexibility and suboptimal communication performance.

[0017]

[0032] Aspects of the present disclosure provide a UE with a flexible approach to signaling temporary RS configurations and signaling temporary RS activation. As described in more detail below, according to some aspects, an RRC signaling mechanism including per-carrier aperiodic trigger state lists, each associated with one or more RS configurations, may allow some RRC parameters to be reused, avoiding the need to duplicate other RRC parameters. According to some aspects, dynamic signaling such as MAC-CE may activate the SCell and may also indicate the RS configurations to be monitored in the SCell. The signaling mechanism proposed herein may result in reduced RRC overhead compared to the overhead associated with duplicating all RRC parameters related to triggering a temporary RS.

[0018]

[0033] According to some aspects, the signaling mechanism proposed herein may enable the MAC-CE or other signaling to indicate trigger states separately for different carriers. The MAC-CE or other signaling having separate trigger state indication fields for different carriers may enable flexible temporary RS indication, unlike the approach of reusing all RRC parameters for all carriers.

[0019] Introduction to wireless communication networks

[0034] FIG. 1 illustrates an example of a wireless communication system 100 in which aspects described herein may be implemented.

[0020]

[0035] Generally, the wireless communication system 100 includes network entities 102, user equipments (UEs) 104, and one or more core networks, such as an Evolved Packet Core (EPC) 160 and a 5G Core (5GC) network 190, which interoperate to provide wireless communication services.

[0021]

[0036] The network entity 102 may provide an access point to the EPC 160 and / or the 5GC 190 for the user equipment 104 and may perform one or more of the following, among other functions: forwarding of user data, encryption and decryption of radio channels, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference control, connection setup and release, load balancing, Non-Access Stratum (NAS) message distribution, NAS node selection, synchronization, Radio Access Network (RAN) sharing, Multimedia Broadcast Multicast Service (MBMS), subscriber and equipment tracking, RAN Information Management (RIM), paging, positioning, and delivery of alert messages. The network entity may include and / or be referred to as a gNB, NodeB, eNB, ng-eNB (e.g., an eNB that has been extended to provide connectivity to both EPC160 and 5GC190), access point, base transceiver station, radio base station, radio transceiver, or transceiver function, or a transmission / reception point, in various circumstances.

[0022]

[0037] The network entities 102 communicate wirelessly with the UEs 104 via communication links 120. Each of the network entities 102 may provide communication coverage in a respective geographic coverage area 110, which may in some cases overlap. For example, a small cell 102' (e.g., a low power base station) may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro cells (e.g., high power base stations).

[0023]

[0038] The communication link 120 between the network entity 102 and the UE 104 may include uplink (UL) (also referred to as reverse link) transmissions from the user equipment 104 to the network entity 102, and / or downlink (DL) (also referred to as forward link) transmissions from the network entity 102 to the user equipment 104. The communication link 120 may use Multiple-Input and Multiple-Output (MIMO) antenna technologies, including spatial multiplexing, beamforming, and / or transmit diversity in various aspects.

[0024]

[0039] Examples of UEs 104 include mobile phones, smartphones, session initiation protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players, cameras, gaming consoles, tablets, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small cooking appliances, healthcare devices, implants, sensors / actuators, displays, or other similar devices. Some of the UEs 104 may be internet of things (IoT) devices (e.g., parking meters, gas pumps, toasters, vehicles, heart monitors, or other IoT devices), always on (AON) devices, or edge processing devices. The UE 104 may also be referred to more generally as a station, mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or client.

[0025]

[0040] Communications using higher frequency bands may have higher path loss and shorter range compared to lower frequency communications. Thus, some network entities (e.g., 180 in FIG. 1) may utilize beamforming 182 with the UE 104 to improve path loss and range. For example, the network entities 180 and the UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays, to facilitate beamforming.

[0026]

[0041] In some cases, the network entity 180 may transmit a beamformed signal to the UE 104 in one or more transmit directions 182′. The UE 104 may receive the beamformed signal from the network entity 180 in one or more receive directions 182″. The UE 104 may also transmit a beamformed signal to the network entity 180 in one or more transmit directions 182″. The network entity 180 may also receive a beamformed signal from the UE 104 in one or more receive directions 182′. The network entity 180 and the UE 104 may then perform beam training to determine the best receive and transmit directions of each of the network entity 180 and the UE 104. In particular, the transmit and receive directions of the network entity 180 may be the same or different. Similarly, the transmit and receive directions of the UE 104 may be the same or different.

[0027]

[0042] The wireless communication network 100 includes a channel state information (CSI) reporting component 199 that may be configured to transmit CSI reports and / or RS configurations. The wireless network 100 further includes a CSI reporting component 198 that may be configured and used to receive CSI reporting configurations.

[0028]

[0043] FIG. 2 illustrates aspects of an example network entity 102 and user equipment (UE) 104.

[0029]

[0044] Generally, the network entity 102 includes various processors (e.g., 220, 230, 238, and 240), antennas 234a-t (collectively 234), transceivers 232a-t (collectively 232) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., data source 212) and wireless reception of data (e.g., data sink 239). For example, the network entity 102 may transmit and receive data between itself and the user equipment 104.

[0030]

[0045] The network entity 102 includes a controller / processor 240 that may be configured to implement various functions related to wireless communications. In the depicted example, the controller / processor 240 includes a CSI reporting component 241 that may represent the CSI reporting component 199 of FIG. 1. Notably, while shown as an aspect of the controller / processor 240, the CSI reporting component 241 may be implemented in addition to or instead of various other aspects of the network entity 102 in other implementations.

[0031]

[0046] Generally, the user equipment 104 includes various processors (e.g., 258, 264, 266, and 280), antennas 252a-r (collectively 252), transceivers 254a-r (collectively 254) including modulators and demodulators, and other aspects that enable wireless transmission of data (e.g., data source 262) and wireless reception of data (e.g., data sink 260).

[0032]

[0047] In various aspects, a network device, network entity, or network node may be implemented as an aggregation network entity, as a non-aggregation network entity, as a component of a network entity, as an Integrated Access and Backhaul (IAB) node, as a relay node, as a sidelink node, to name a few.

[0033]

[0048] The non-aggregated network entity architecture may include one or more central units (CUs) that may communicate directly with the core network over a backhaul link or indirectly with the core network through one or more non-aggregated network entity units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) over an E2 link or a Non-Real Time (Non-RT) RIC associated with a Service Management and Orchestration (SMO) framework, or both). The CUs may communicate with one or more Distributed Units (DUs) over respective midhaul links, such as an F1 interface. The DUs may communicate with one or more Radio Units (RUs) over respective fronthaul links. The RUs may communicate with respective UEs 104 over one or more Radio Frequency (RF) access links. In some implementations, a UE 104 may be served by multiple RUs simultaneously.

[0034]

[0049] Each of the units, e.g., the CU, DU, RU, and quasi-RT RIC, non-RT RIC, and SMO framework, may include or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) over a wired or wireless transmission medium. Each of the units, or an associated processor or controller that provides instructions to the unit's communication interface, may be configured to communicate with one or more of the other units over a transmission medium. For example, a unit may include a wired interface configured to receive or transmit signals to or from one or more of the other units over a wired transmission medium. Additionally or alternatively, a unit may include a wireless interface, which may include a receiver, transmitter, or transceiver (such as a radio frequency (RF) transceiver) configured to receive or transmit or transmit signals to or from one or more of the other units over a wireless transmission medium.

[0035]

[0050] In some aspects, the CU may host one or more higher layer control functions. Such control functions may include Radio Resource Control (RRC), Packet Data Convergence Protocol (PDCP), Service Data Adaptation Protocol (SDAP), and the like. Each control function may be implemented with an interface configured to communicate signals with other control functions hosted by the CU. The CU may be configured to handle user plane functions (e.g., Central Unit-User Plane (CU-UP)), control plane functions (e.g., Central Unit-Control Plane (CU-CP)), or a combination thereof. In some implementations, the CU may be logically divided into one or more CU-UP units and one or more CU-CP units. The CU-UP units, when implemented in an O-RAN configuration, may communicate bidirectionally with the CU-CP units via an interface such as an E1 interface. The CU may be implemented to communicate with the DUs, as necessary, for network control and signaling.

[0036]

[0051] The DU may correspond to a logical unit including one or more network entity functions for controlling the operation of one or more RUs. In some aspects, the DU may correspond to a 3G Partnership Project (3GPP) 3GPP ... rdDepending at least in part on a functional division such as that defined by the Third Generation Partnership Project (3GPP), the DU may host one or more of a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and one or more higher physical (PHY) layers (such as modules for Forward Error Correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.). In some aspects, the DU may further host one or more lower PHY layers. Each layer (or module) may be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU or with control functions hosted by the CU.

[0037]

[0052] The lower layer functions may be implemented by one or more RUs. In some deployments, the RUs controlled by the DU may correspond to logical nodes hosting RF processing functions, or lower PHY layer functions (such as performing Fast Fourier Transform (FFT), inverse FFT (iFFT), digital beamforming, Physical Random Access CHannel (PRACH) extraction and filtering, etc.), or both, based at least in part on a functional division such as a lower layer functional division. In such an architecture, the RU(s) may be implemented to handle Over The Air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU(s) may be controlled by the corresponding DU. In some scenarios, this configuration may enable the DU(s) and CU to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0038]

[0053] The SMO framework may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO framework may be configured to support deployment of dedicated physical resources for RAN coverage requirements that may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework may be configured to interact with a cloud computing platform (such as an Open Cloud (O-Cloud)) to perform network element life cycle management (such as instantiating virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, a CU, a DU, a RU, and a quasi-RT RIC. In some implementations, the SMO framework may communicate with hardware aspects of a 4G RAN, such as an Open eNB (O-eNB), via an O1 interface. Additionally, in some implementations, the SMO framework may communicate directly with one or more RUs via an O1 interface. The SMO framework may also include a non-RT RIC configured to support the functionality of the SMO framework.

[0039]

[0054] A non-RT RIC may be configured to include logic functions that enable non-real-time control and optimization of RAN elements and resources, Artificial Intelligence / Machine Learning (AI / ML) workflows including model training and updates, or policy-based guidance of applications / features in the quasi-RT RIC. A non-RT RIC may be coupled to or in communication with a quasi-RT RIC (e.g., via an A1 interface). A quasi-RT RIC may be configured to include logic functions that enable near real-time control and optimization of RAN elements and resources by data collection and action via an interface connecting one or more CUs, one or more DUs, or both, and the O-eNB to the quasi-RT RIC (e.g., via an E2 interface).

[0040]

[0055] In some implementations, the non-RT RIC may receive parameters or external enrichment information from an external server to generate the AI / ML model deployed in the quasi-RT RIC. Such information may be utilized by the quasi-RT RIC or may be received in the SMO framework or the non-RT RIC from a non-network data source or from a network function. In some examples, the non-RT RIC or the quasi-RT RIC may be configured to adjust RAN behavior or performance. For example, the non-RT RIC may employ the AI / ML model to monitor long-term trends and patterns regarding performance and take corrective action through the SMO framework (e.g., reconfiguration via O1) or by creating a RAN management policy (e.g., A1 policy).

[0041]

[0056] The user equipment 104 includes a controller / processor 280 that may be configured to implement various functions relating to wireless communications. In the illustrated example, the controller / processor 280 includes a CSI reporting component 281 that may represent the CSI reporting component 198 of FIG. 1. Notably, while the CSI reporting component 281 is shown as an aspect of the controller / processor 280, in other implementations, it may be implemented in addition to or instead of various other aspects of the user equipment 104.

[0042]

[0057] Figures 3A-3D illustrate aspects of data structures for a wireless communications network, such as wireless communications network 100 of Figure 1. In particular, Figure 3A is a diagram 300 illustrating an example of a first subframe in a 5G (e.g., 5G NR) frame configuration, Figure 3B is a diagram 330 illustrating an example of a DL channel within the 5G subframe, Figure 3C is a diagram 350 illustrating an example of a second subframe in the 5G frame configuration, and Figure 3D is a diagram 380 illustrating an example of a UL channel within the 5G subframe.

[0043]

[0058] Further explanation regarding Figures 1, 2, and 3A-3D is provided later in this disclosure.

[0044] Example CSI Reporting Configuration

[0059] Channel state information (CSI) may refer to the channel characteristics of a communication link. CSI may represent, for example, the combined effects of scattering, fading, and power attenuation due to distance between the transmitter and receiver. Channel estimation using pilots such as a CSI reference signal (CSI-RS) may be performed to determine these effects on the channel. CSI may be used to adapt transmissions based on current channel conditions, which is particularly useful for achieving reliable communications with high data rates in multi-antenna systems. CSI is typically measured and quantized at the receiver and fed back to the transmitter.

[0045]

[0060] The time and frequency resources that may be used by a user equipment (UE) to report CSI are controlled by a network entity (e.g., gNB). The CSI may include a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), and / or an L1-RSRP. However, as described below, additional or other information may be included in the report.

[0046]

[0061] The UE may be configured for CSI reporting by a network entity. The network entity may configure the UE for CSI reporting. For example, the network entity configures the UE with one CSI reporting configuration or multiple CSI reporting configurations. The CSI reporting configuration may be provided to the UE via higher layer signaling (e.g., CSI-ReportConfig), such as Radio Resource Control (RRC) signaling. The CSI reporting configuration may be associated with CSI-RS resources for Channel Measurement (CM), Interference Measurement (IM), or both.

[0047]

[0062] For example, FIG. 4 illustrates a CSI reporting configuration with CSI-RS resource mapping for CSI aperiodic trigger state. Various information elements (IEs) and corresponding fields illustrated in FIG. 4 are defined in standards (e.g., 3GPP 38.331). The CSI reporting configuration configures the CSI-RS resources (e.g., CSI-ResourceConfig in FIG. 4) for measurement. The CSI-RS resources provide the UE with a configuration of CSI-RS ports or CSI-RS port groups mapped to time and frequency resources (e.g., Resource Elements (REs)). The CSI-RS resources may be Zero Power (ZP) or Non-Zero Power (NZP) resources (each defined by element NZP-CSI-Resource associated with NZP-CSI-RS-ResourceSet). In FIG. 4, the NZP resources may be assigned in the CSI-RS-ResourceSetList for aperiodic trigger state signaling. At least one NZP CSI-RS resource may be configured for a CM.

[0048]

[0063] As shown, the CSI-AperiodicTriggerStateList information element (IE) 410 may include a list of CSI-AperiodicTrigger States. The DCI or MAC-CE may indicate a codepoint to trigger one of the trigger states in the list. As shown, each trigger state may be associated with one or more CSI-RS configurations (CSI-AssociatedReportConfigInfo IEs). In the illustrated example, the first trigger state in the list is associated with two CSI-AssociatedReportConfigInfo IEs (420-1 and 420-2). By associating multiple RS configurations with a single trigger state, multiple aperiodic RSs may be triggered simultaneously.

[0049]

[0064] The CSI-AssociatedReportConfigInfo IE may contain various fields such as reportConfigId, resourceSet, qcl-Info, etc. The reportConfigId maps to a specific CSI-ReportConfig IE. The resource set field may point to an entry number of the CSI-RS-ResourceSet in the CSI-ResourceConfig IE. The qcl-info field may point to a list of Transmission Configuration Information (TCI) states for the CSI-RS-Resources in the CSI-RS-ResourceSet IE.

[0050]

[0065] For Type II codebooks, the PMI is a linear combination of beams. It has a subset of orthogonal beams used for linear combination, with amplitude and phase of each beam for each layer and polarization. For any type of PMI, there can be a wideband (WB) PMI and / or a subband (SB) PMI as configured.

[0051]

[0066] The CSI reporting configuration may configure the UE for aperiodic, periodic, or semi-persistent CSI reporting. For periodic CSI, the UE may be configured with periodic CSI-RS resources. Periodic CSI on the Physical Uplink Control Channel (PUCCH) may be triggered via RRC. Semi-persistent CSI reporting on the Physical Uplink Control Channel (PUCCH) may be activated by the Medium Access Control (MAC) Control Element (CE).

[0052]

[0067] The UE may report CSI Feedback (CSF) based on the CSI reporting configuration and the CSI reporting trigger. For example, the UE may measure a channel on which the triggered CSI-RS resource (associated with the CSI reporting configuration) is carried. Based on the measurement, the UE may select a preferred CSI-RS resource. The UE reports the CSF of the selected CSI-RS resource. The LI may be calculated conditioned on the reported CQI, PMI, RI, and CRI. The CQI may be calculated conditioned on the reported PMI, RI, and CRI. The PMI may be calculated conditioned on the reported RI and CRI, and the RI may be calculated conditioned on the reported CRI.

[0053]

[0068] Each CSI reporting configuration may be associated with a single downlink (DL) BandWidth Part (BWP). A CSI reporting configuration configuration may define a CSI reporting band as a subset of sub-bands of the BWP. The associated DL BWP may be indicated by higher layer parameters (e.g., bwp-Id) in the CSI reporting configuration for channel measurement and includes parameters (single or multiple) of one CSI reporting band, such as codebook configuration, time domain behavior, frequency granularity of CSI, measurement restriction configuration, and CSI-related quantities to be reported by the UE. Each CSI resource configuration may be located in the DL BWP identified by the higher layer parameters, and all CSI resource configurations linked to a CSI reporting configuration may have the same DL BWP.

[0054]

[0069] In some systems, the UE may be configured via higher layer signaling (e.g., in a CSI reporting configuration) with one of two possible sub-band sizes (e.g., reportFreqConfiguration, included in CSI-ReportConfig) that indicates the frequency granularity of the CSI reporting, where the sub-bands are:

[0055]

number

[0056] The precoder is defined as a set of consecutive physical resource blocks (PRBs) depending on the total number of PRBs in the bandwidth portion. The UE may further receive an indication of subbands for which CSI feedback is requested. In some examples, a subband mask is configured for the requested subbands for CSI reporting. The UE calculates a precoder for each requested subband and finds a PMI on each of the subbands that matches the calculated precoder.

[0057] Example Signaling Details for Temporary RS-Based Secondary Cell Activation

[0070] Aspects of the present disclosure provide an apparatus, method, processing system, and computer-readable medium for a UE to determine a temporary reference signal (RS) to monitor on a secondary cell (SCell) based on an RS configuration. According to some aspects, the RS configuration may be associated with a trigger condition.

[0058]

[0071] For example, the techniques described herein may provide signaling details for configuring and triggering the temporary RS 504 shown in the example timeline 500 of FIG.

[0059]

[0072] As shown in Figure 5, after the UE receives an activation command 508 (sent on the PCell) to activate the SCell, the SCell may not be considered active until 3 ms after the UE sends an acknowledgment (ACK) 510. In addition, there is an additional delay to allow the UE to monitor reference signals, such as SSBs 502, that the UE may use to adjust its time and frequency tracking before sending a channel state information (CSI) report. This total delay is labeled T in Figure 5. activation time It is called.

[0060]

[0073] As noted above, if a UE relies on an SSB for initial CSI measurements in a SCell, there may be substantial delays due to the relatively long period between SSBs. The use of temporary RS may substantially reduce the SCell activation time by allowing the UE to send a valid CSI report much sooner than if it had to wait for a subsequent SSB.

[0061]

[0074] According to some aspects of the disclosure, a UE may be RRC configured for a temporary RS utilizing similar RRC signaling for aperiodic CSI-RS and temporary RS, with triggering conditions defined using a "per-carrier" configuration (e.g., as described in more detail below with reference to FIG. 10). The temporary RS may be triggered (and details of the temporary RS may be indicated to the UE) by indicating one of the triggering conditions.

[0062]

[0075] There are various options to trigger the temporary RS after SCell activation. For example, as shown in Figure 6A, the Physical Downlink Shared CHannel (PDSCH) may carry a MAC CE that activates the Scell ​​and also triggers the temporary RS. In the illustrated example, the UE receives the MAC CE on the PCell and acknowledges it (via a hybrid automatic repeat request acknowledgment, HARQ-ACK). 3 ms after the HARQ-ACK, the SCell may be considered activated and the temporary RS may be sent.

[0063]

[0076] In some cases, the MAC CE may indicate (e.g., by a bit field / codepoint) at least one triggering state from a per-carrier aperiodic state list of the SCell carrier. The UE may then monitor the temporary RS on the SCell based on the RS configuration associated with the at least one triggering state indicated in the MAC CE.

[0064]

[0077] In this way, a bit field / codepoint in the MAC CE may indicate one of multiple RRC-signaled per-carrier RS ​​configurations. The UE may then monitor the temporary RS on the SCell based on the indicated RS configuration.

[0065]

[0078] As shown in the example timeline 600B of FIG. 6B, according to another option, the MAC CE carried in the PDSCH 612 can trigger the SCell activation, while the Downlink Control Information (DCI) 514 can trigger the temporary RS 604. In this case, the DCI may indicate (e.g., by a bit field / code point) at least one triggering condition from a per-carrier aperiodic condition list of the SCell carrier. The UE may then monitor the temporary RS on the SCell based on the RS configuration associated with the at least one triggering condition indicated in the DCI.

[0066]

[0079] The RS configuration associated with the MAC CE or codepoint indicated in the DCI (e.g., temporary RS trigger state) may configure various forms of temporary RS. For example, Figure 7 shows an example timeline 700 in which a temporary RS has two bursts 706 of an Aperiodic Tracking Reference Signal (A-TRS) 704. In the illustrated example, each burst spans two slots and four CSI-RS resources.

[0067]

[0080] Such flexibility in defining the temporary RS may help cover multiple SCell activation scenarios. For example, in the first scenario, the SCell to be activated may be known and may belong to FR1. If the SCell measurement cycle is less than or equal to 2400 ms, one burst (e.g., a burst over two slots with four CSI-RS resources) may be used for time and frequency tracking. If the SCell measurement cycle is greater than 2400 ms, one burst (two slots with four CSI-RS resources) may be used for Automatic Gain Control (AGC). In addition to the burst used for AGC, a separate burst (two slots with four CSI-RS resources) may be used for time and frequency tracking. The minimum gap between both the RS symbols used for AGC and the RS symbols used for time and frequency acquisition is two slots for 15 kHz and 30 kHz, and three slots for 60 kHz.

[0068]

[0081] In the second scenario, the SCell may be unknown and may belong to FR1. When the SCell is adjacent to an active serving cell in the same band (e.g., in-band continuous CA), one burst (two slots with four CSI-RS resources) may be used for AGC when the power difference between the serving cell and the SCell to be activated is less than or equal to 6 dB. Another burst (two slots with four CSI-RS resources) may be used for time-frequency tracking.

[0069]

[0082] In a third scenario, the SCell may belong to FR2. If there is at least one active serving cell on the FR2 band and a temporary RS is provided for the target SCell, one burst (two slots with four CSI-RS resources) may be used for time-frequency tracking. If there is no active serving cell on the FR2 band and the SCell to be activated is known to the UE, one burst (two slots with four CSI-RS resources) is required for time-frequency tracking. If the SCell to be activated is unknown and there is no active serving cell on the FR2 band, the temporary RS may not be used for AGC and there may be various considerations on how to use the temporary RS for time / frequency tracking.

[0070]

[0083] Figure 8 is a call flow diagram 800 illustrating SCell activation and temporary RS indication by a MAC CE (e.g., along the lines of the example shown in Figure 6A). In some aspects, the network entity shown in Figure 8 and / or Figure 9 may be an example of the network entity 102 shown and described with respect to Figures 1 and 3, or the non-aggregated network entity shown and described with respect to Figure 2. Similarly, the UE shown in Figure 8 and / or Figure 9 may be an example of the UE 104 shown and described with respect to Figures 1 and 3.

[0071]

[0084] As mentioned above, a UE may be configured with multiple RRC signaled per-carrier RS ​​configurations.

[0072]

[0085] For example, as shown, at 806, the UE may receive radio resource control (RRC) signaling that configures the UE for channel state information (CSI) reporting with a per-carrier aperiodic trigger state list of one or more types of reference signals (RS). At 808, the network entity activates the SCell and triggers the temporary RS by the MAC CE. As noted above, a bit field / code point in the MAC CE may indicate one of multiple RRC signaled per-carrier RS ​​configurations. For example, as shown in FIG. 8, the MAC CE may indicate (by a bit field / code point) a trigger state associated with at least one RS per-carrier configuration.

[0073]

[0086] As shown, at 810, the UE may then monitor a temporary RS on the secondary cell based at least in part on the at least one RS configuration associated with the at least one trigger condition indicated in the MAC CE (at 808). The temporary RS may enable the UE to start communication on the SCell earlier than a traditional SSB-based SCell activation scenario. For example, based on the temporary RS measurements, the UE may generate and transmit a CSI report, e.g., before SBB is available.

[0074]

[0087] FIG. 9 is a call flow diagram 900 illustrating SCell activation by a MAC CE and temporary RS indication by a DCI (eg, following the example shown in FIG. 6B).

[0075]

[0088] As shown, at 906, the UE may receive RRC signaling that configures the UE for CSI reporting with a per-carrier aperiodic trigger state list of one or more types of reference signals (RS). As shown, after the RRC configuration, at 908, the network entity activates the SCell via the MAC CE and triggers the temporary RS via the DCI at 910. As shown, at 912, the UE may then monitor the temporary RS on the secondary cell based at least in part on the at least one RS configuration indicated in the DCI (at 910).

[0076]

[0089] FIG. 10 illustrates an example of a per-carrier aperiodic trigger state list 1010 for a temporary RS proposed herein. The illustrated example shows RRC signaling including a first CSI-aperiodic trigger state list 1010-1 for a first CC (CC1) and a second CSI-aperiodic trigger state list 1010-2 for a second CC (CC2). Each CSI-aperiodic trigger state list may be an RRC information element indicating multiple trigger states (e.g., CSI-aperiodic trigger states) for a respective carrier. The RRC signaling may include multiple CSI-aperiodic trigger state lists, each corresponding to a different carrier. As used herein, the term "CSI-aperiodic trigger state list" refers to an indication of multiple CSI-aperiodic trigger states.

[0077]

[0090] As described above, the trigger signaling (e.g., MAC-CE, DCI, or other control information) may trigger a trigger state from the CSI-aperiodic trigger state list. For example, the trigger signaling may include a trigger state indication field including a codepoint(s) or a bitmap indicating a trigger state in the CSI-aperiodic trigger state list. The trigger signaling may indicate a trigger state for each carrier. For example, as shown in FIG. 10, the trigger signaling may include a trigger state indication field for each carrier associated with the carrier's corresponding CSI-aperiodic trigger state list. In this manner, the trigger signaling may indicate a trigger state (e.g., a CSI-aperiodic trigger state from the CSI-aperiodic trigger state list) per carrier. Thus, a CSI reporting configuration (e.g., as indicated by CSI-ReportConfig) associated with each respective trigger state may be configured and triggered per carrier based on the CSI-aperiodic trigger state list provided per carrier.

[0078]

[0091] As shown, each trigger state may be associated with one or more CSI-RS configurations (CSI-AssociatedReportConfigInfo). In the illustrated example, the first trigger state in the list for CC1 is associated with two CSI-RS configurations (1020-1 and 1020-2). By associating multiple RS configurations with a single trigger state, multiple aperiodic RSs may be triggered simultaneously (and used as temporary RSs).

[0079]

[0092] The carrier on which the temporary RS is triggered by a given trigger condition may be the carrier associated with the associated trigger condition list. For example, if a trigger condition from list 1010-1 of CC1 is triggered, then the CSI-ResourceConfigIDcarrier may be assumed to be CC1.

[0080]

[0093] As mentioned above, the MAC-CE may activate the SCell and indicate the RS configuration to be monitored on the SCell. There are various approaches to design such a MAC-CE suitable for indicating the RS configuration by, for example, indicating a trigger condition for triggering a temporary RS, according to the approaches proposed herein.

[0081]

[0094] According to one option, the MAC-CE may have multiple blocks of bits (sometimes referred to as Z-bit blocks), where each SCell has a defined Z-bit block, with the value of Z being equal to or greater than 0. The Z-bit block may indicate a temporary RS for a given SCell, for example, using the configuration index of the SCell. In some cases, the n-th code point of the Z-bit block may indicate the n-th trigger state of a list of trigger states for the SCell. A value of 0 in the Z-bit block may indicate that no temporary RS resources are transmitted for the corresponding SCell.

[0082]

[0095] In some cases, the SCell to be activated may be indicated by a specific value (C value) in the MAC CE that also triggers the temporary RS. If the temporary RS is triggered with a separate DCI, the C value of the existing SCell activation / deactivation MAC CE (e.g., in the legacy MAC CE format) may be used to indicate the SCell to be activated.

[0083] Exemplary Methods

[0096] 11 illustrates example operations 1100 for wireless communication by a UE. The operations 1100 may be performed by a UE (such as, for example, the UE 104 of FIG. 1) to monitor a temporary reference signal (RS) on a secondary cell (SCell) based on, for example, an RS configuration associated with a trigger condition.

[0084]

[0097] At 1110, the UE receives radio resource control (RRC) signaling that configures the UE for channel state information (CSI) reporting with a per-carrier aperiodic trigger condition list of one or more types of reference signals (RS).

[0085]

[0098] At 1120, the UE activates the secondary cell and receives dynamic signaling indicating at least one trigger state from one of the per carrier aperiodic trigger state lists associated with the secondary cell.

[0086]

[0099] At 1130, the UE monitors the temporary RS on the secondary cell based at least in part on the at least one RS configuration associated with the at least one trigger condition.

[0087]

[0100] 12 illustrates example operations 1200 for wireless communication by a network entity. The operations 1200 may be performed by a network entity (e.g., the network entity 102 of FIG. 1 ) to, for example, transmit dynamic signaling indicating at least one trigger state from one of aperiodic trigger state lists per carrier.

[0088]

[0101] At 1210, the network entity sends RRC signaling to the UE to configure the UE for CSI reporting with a per-carrier aperiodic trigger state list for one or more types of RS.

[0089]

[0102] At 1220, the network entity transmits dynamic signaling indicating at least one trigger state from one of the per-carrier aperiodic trigger state lists associated with the secondary cell to trigger the UE to activate the secondary cell and monitor the temporary RS transmitted on the secondary cell based at least in part on the at least one RS configuration associated with the at least one trigger state.

[0090]

[0103] 13 illustrates example operations 1300 for wireless communication by a UE. The operations 1300 may be performed by a UE (such as, for example, the UE 104 of FIG. 1) to monitor a temporary reference signal (RS) on a secondary cell (SCell) based on, for example, an RS configuration associated with a trigger condition.

[0091]

[0104] At 1310, the UE receives radio resource control (RRC) signaling to configure the UE with one or more per-carrier reference signal (RS) configurations.

[0092]

[0105] At 1320, the UE activates the secondary cell and receives dynamic signaling indicating at least one of the RS configurations per one or more carriers.

[0093]

[0106] At 1330, the UE monitors the temporary RS on the secondary cell based at least in part on at least one of the one or more RS configurations indicated by the dynamic signaling.

[0094]

[0107] 14 illustrates example operations 1400 for wireless communication by a network entity. The operations 1400 may be performed by a network entity (e.g., the network entity 102 of FIG. 1 ) to, for example, transmit dynamic signaling indicating at least one trigger state from one of aperiodic trigger state lists per carrier.

[0095]

[0108] At 1410, a network entity transmits radio resource control (RRC) signaling to a user equipment (UE) to configure the UE with one or more per-carrier reference signal (RS) configurations.

[0096]

[0109] At 1420, the network entity activates the secondary cell and transmits transmit dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations for temporary RS transmission on the secondary cell.

[0097] Exemplary Wireless Communication Device

[0110] Figure 15 illustrates an example communications device 1500 that includes various components operable, configured, or adapted to perform operations for the techniques disclosed herein, such as those illustrated and described with respect to Figures 11 and 13. In some examples, the communications device 1500 may be a user equipment 104, for example, as described with respect to Figures 1 and 2.

[0098]

[0111] Communications device 1500 includes a processing system 1502 coupled to a transceiver 1508 (e.g., a transmitter and / or receiver). The transceiver 1508 is configured to transmit and receive signals, such as various signals as described herein for communications device 1500 via an antenna 1510. Processing system 1502 may be configured to perform processing functions for communications device 1500, including processing signals received by communications device 1500 and / or to be transmitted.

[0099]

[0112] The processing system 1502 includes one or more processors 1520 coupled to a computer-readable medium / memory 1530 via a bus 1506. In some aspects, the computer-readable medium / memory 1530 is configured to store instructions (e.g., computer-executable code) that, when executed by the one or more processors 1520, cause the one or more processors 1520 to perform the operations shown in Figures 11 and 13 or other operations to perform various techniques for receiving a channel state information (CSI) reporting configuration with per-carrier trigger state list, as described herein.

[0100]

[0113] In the illustrated example, computer-readable medium / memory 1530 stores code 1531 for receiving RRC signaling configuring the UE for CSI reporting with a per-carrier aperiodic trigger state list of one or more types of RS, code 1532 for activating a secondary cell and receiving dynamic signaling indicating at least one trigger state from one of the per-carrier aperiodic trigger state lists associated with the secondary cell, and code 1533 for monitoring a temporary RS on the secondary cell based on the at least one RS configuration associated with the at least one trigger state. Additionally, computer-readable medium / memory 1530 stores code for receiving radio resource control (RRC) signaling configuring the UE with one or more per-carrier reference signal (RS) configurations, code for activating a secondary cell and receiving dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations, and code for monitoring a temporary RS on the secondary cell based at least in part on at least one of the one or more RS configurations indicated by the dynamic signaling.

[0101]

[0114] In the illustrated example, the one or more processors 1520 include circuitry configured to implement code stored in a computer-readable medium / memory 1530, including circuitry 1521 for receiving RRC signaling to configure the UE for CSI reporting with a per-carrier aperiodic trigger state list for one or more types of RS; circuitry 1522 for activating a secondary cell and receiving dynamic signaling indicating at least one trigger state from one of the per-carrier aperiodic trigger state lists associated with the secondary cell; and circuitry 1523 for monitoring a temporary RS on the secondary cell based on the at least one RS configuration associated with the at least one trigger state. Additionally, the one or more processors 1520 include circuitry configured to implement code stored in the computer-readable medium / memory 1530, including circuitry for RRC signaling to configure the UE with one or more per-carrier RS ​​configurations; circuitry for dynamic signaling to activate a secondary cell and indicate at least one of the one or more per-carrier RS ​​configurations; and circuitry for monitoring a temporary RS on the secondary cell based at least in part on at least one of the one or more RS configurations indicated by the dynamic signaling.

[0102]

[0115] The various components of the communications device 1500 may provide means for performing the methods described herein, including those with respect to FIGS.

[0103]

[0116] In some examples, the transmitting or sending means (or the means for outputting for transmission) may include the transceiver 254 and / or the antenna(s) 252 of the user equipment 104 shown in FIG. 2 and / or the transceiver 1508 and antenna 1510 of the communications device 1500 in FIG. 15.

[0104]

[0117] In some examples, the receiving means (or obtaining means) may include the transceiver 254 and / or the antenna(s) 252 of the user equipment 104 shown in FIG. 2 and / or the transceiver 1508 and antenna 1510 of the communication device 1500 of FIG. 15.

[0105]

[0118] In some examples, the receiving and / or monitoring means may include various processing system components, such as one or more processors 1520 in FIG. 15, or aspects of the user equipment 104 in FIG. 2 including the receive processor 258, the transmit processor 264, the TX MIMO processor 266, and / or the controller / processor 280 (including receiving the CSI reporting configuration 281 including the per carrier trigger condition list).

[0106]

[0119] Notably, FIG. 15 is merely an example, and many other examples and configurations of communications device 1500 are possible.

[0107]

[0120] Figure 16 illustrates an example communications device 1600 that includes various components operable, configured, or adapted to perform operations for the techniques disclosed herein, such as those illustrated and described with respect to Figures 12 and 14. In some examples, the communications device 1600 may be a network entity 102, such as those described with respect to Figures 1 and 2.

[0108]

[0121] Communications device 1600 includes a processing system 1602 coupled to a transceiver 1608 (e.g., a transmitter and / or a receiver). The transceiver 1608 is configured to transmit and receive signals, such as various signals as described herein for communications device 1600, via an antenna 1610. The processing system 1602 may be configured to perform processing functions for communications device 1600, including processing signals received by communications device 1600 and / or signals to be transmitted.

[0109]

[0122] The processing system 1602 includes one or more processors 1620 coupled to a computer-readable medium / memory 1630 via a bus 1606. In some aspects, the computer-readable medium / memory 1630 is configured to store instructions (e.g., computer-executable code) that, when executed by the one or more processors 1620, cause the one or more processors 1620 to perform the operations shown in FIGS. 12 and 14 or other operations to perform various techniques for transmitting a CSI reporting configuration including per carrier trigger state list, as described herein.

[0110]

[0123] In the illustrated example, computer-readable medium / memory 1630 stores code 1631 for sending RRC signaling to the UE configuring the UE for CSI reporting with a per-carrier aperiodic trigger state list of one or more types of RS, and code 1632 for sending dynamic signaling indicating at least one trigger state from one of the per-carrier aperiodic trigger state lists associated with the secondary cell to activate the secondary cell and trigger the UE to monitor a temporary RS transmitted on the secondary cell based on the at least one RS configuration associated with the at least one trigger state. Additionally, computer-readable medium / memory 1630 stores code for sending RRC signaling to the UE configuring the UE with one or more per-carrier RS ​​configurations and code for activating the secondary cell and sending dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations for temporary RS transmission on the secondary cell.

[0111]

[0124] In the illustrated example, the one or more processors 1620 include circuitry configured to implement code stored in a computer-readable medium / memory 1630, including circuitry 1621 for sending, to the UE, RRC signaling to configure the UE for CSI reporting using a per-carrier aperiodic trigger state list or one or more types of RS, and circuitry 1622 for sending dynamic signaling indicating at least one trigger state from one of the per-carrier aperiodic trigger state lists associated with the secondary cell to activate the secondary cell and trigger the UE to monitor a temporary RS transmitted on the secondary cell based on the at least one RS configuration associated with the at least one trigger state. Additionally, the one or more processors 1620 include circuitry configured to implement code stored in the computer-readable medium / memory 1630, including circuitry for sending RRC signaling to the UE configuring the UE with one or more per-carrier RS ​​configurations, and circuitry for sending dynamic signaling to activate a secondary cell and indicating at least one of the one or more per-carrier RS ​​configurations for temporary RS transmission on the secondary cell.

[0112]

[0125] The various components of the communications device 1600 may provide means for performing the methods described herein, including those with respect to FIGS.

[0113]

[0126] In some examples, the transmitting or sending means (or the means for outputting for transmission) may include the transceiver 232 and / or the antenna(s) 234 of the network entity 102 shown in FIG. 2 and / or the transceiver 1608 and antenna 1610 of the communications device 1600 in FIG. 16.

[0114]

[0127] In some examples, the receiving means (or obtaining means) may include the transceiver 232 and / or the antenna(s) 234 of the network entity shown in FIG. 2 and / or the transceiver 1608 and antenna 1610 of the communications device 1600 in FIG. 16.

[0115]

[0128] In some examples, the transmitting means may include various processing system components, such as one or more processors 1620 in FIG. 16, or aspects of the network entity 102 in FIG. 2 including the receive processor 238, the transmit processor 220, the TX MIMO processor 230, and / or the controller / processor 240 (including the CSI reporting component 241).

[0116]

[0129] Notably, FIG. 16 is merely an example, and many other examples and configurations of communications device 1600 are possible.

[0117] Example clauses

[0130] The following numbered clauses describe example implementations.

[0118]

[0131] Clause 1: A method for wireless communication by a user equipment (UE), comprising: receiving radio resource control (RRC) signaling to configure the UE with one or more per-carrier reference signal (RS) configurations; receiving dynamic signaling to activate a secondary cell and indicate at least one of the one or more per-carrier RS ​​configurations; and monitoring a temporary RS on the secondary cell based at least in part on the at least one of the one or more RS configurations indicated by the dynamic signaling.

[0119]

[0132] Clause 2: The method of clause 1, wherein the temporary RS includes at least one of a CSI-RS or a Tracking RS (TRS).

[0120]

[0133] Clause 3: The method of any one of clauses 1 to 2, wherein at least one of the one or more RS configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a non-periodic trigger state list for each carrier associated with the secondary cell.

[0121]

[0134] Clause 4: The method of any one of clauses 1 to 3, wherein the dynamic signaling includes a medium access control (MAC) control element (CE) activating a secondary cell.

[0122]

[0135] Clause 5: The method of clause 4, wherein the dynamic signaling further comprises downlink control information (DCI) indicating at least one trigger condition.

[0123]

[0136] Clause 6: The method of clause 4 or 5, wherein the MAC CE indicates at least one trigger condition.

[0124]

[0137] Clause 7: The method of any one of clauses 4 to 6, wherein the MAC CE includes a block of bits associated with the secondary cell.

[0125]

[0138] Clause 8: The method of clause 7, wherein the block of bits identifies at least one of one or more RS configurations that indicates a temporary RS.

[0126]

[0139] Clause 9: The method of clause 7 or 8, wherein a value of 0 in the block of bits indicates that no temporary RS is used for the secondary cell.

[0127]

[0140] Clause 10: A method according to any one of clauses 4 to 9, wherein the MAC CE activates a plurality of secondary cells, and the MAC CE comprises a plurality of blocks of bits, each of the blocks of bits being associated with a different secondary cell among the plurality of secondary cells activated by the MAC CE.

[0128]

[0141] Clause 11: A method for wireless communication by a network entity, comprising: transmitting radio resource control (RRC) signaling to configure a user equipment (UE) with one or more per-carrier reference signal (RS) configurations; and transmitting dynamic signaling to activate a secondary cell and indicate at least one of the one or more per-carrier RS ​​configurations for temporary RS transmission on the secondary cell.

[0129]

[0142] Clause 12: The method of clause 11, wherein the temporary RS includes at least one of a CSI-RS or a Tracking RS (TRS).

[0130]

[0143] Clause 13: The method of clause 11 or 12, wherein at least one of the one or more RS configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a non-periodic trigger state list for each carrier associated with the secondary cell.

[0131]

[0144] Clause 14: The method according to any one of clauses 11 to 13, wherein the dynamic signaling includes a medium access control (MAC) control element (CE) activating a secondary cell.

[0132]

[0145] Clause 15: The method of clause 14, wherein the dynamic signaling further comprises downlink control information (DCI) indicating at least one trigger condition.

[0133]

[0146] Clause 16: The method of clause 14 or 15, wherein the MAC CE indicates at least one trigger condition.

[0134]

[0147] Clause 17: The method of clause 16, wherein the MAC CE includes a plurality of blocks of bits, each block of bits being associated with a different secondary cell.

[0135]

[0148] Clause 18: The method of clause 17, wherein the block of bits identifies at least one of one or more RS configurations that indicates a temporary RS.

[0136]

[0149] Clause 19: The method according to any one of clauses 16 to 18, wherein the network entity is configured to set a block of bits to a value of 0 to indicate that a temporary RS is not used for the secondary cell.

[0137]

[0150] Clause 20: A method according to any one of clauses 14 to 19, wherein the MAC CE activates a plurality of secondary cells, and the MAC CE comprises a plurality of blocks of bits, each of the blocks of bits being associated with a different secondary cell among the plurality of secondary cells activated by the MAC CE.

[0138]

[0151] Clause 21: A method for wireless communication by a user equipment (UE), comprising: receiving radio resource control (RRC) signaling to configure the UE for channel state information (CSI) reporting with a per-carrier aperiodic trigger state list of one or more types of reference signals (RS); receiving dynamic signaling to activate a secondary cell and indicate at least one trigger state from one of the per-carrier aperiodic trigger state lists associated with the secondary cell; and monitoring a temporary RS on the secondary cell based at least in part on at least one of the one or more RS configurations associated with the at least one trigger state.

[0139]

[0152] Clause 22: The method of clause 21, wherein the temporary RS includes at least one of a CSI-RS or a Tracking RS (TRS).

[0140]

[0153] Clause 23: The method of clause 21 or 22, wherein at least one of the one or more RS configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a per carrier aperiodic trigger state list associated with a secondary cell.

[0141]

[0154] Clause 24: The method of any one of clauses 21 to 23, wherein the dynamic signaling includes a medium access control (MAC) control element (CE) activating a secondary cell.

[0142]

[0155] Clause 25: The method of clause 24, wherein the dynamic signaling further comprises downlink control information (DCI) indicating at least one trigger condition.

[0143]

[0156] Clause 26: The method of clause 24 or 25, wherein the MAC CE indicates at least one trigger condition.

[0144]

[0157] Clause 27: The method of clause 26, wherein the MAC CE includes a plurality of blocks of bits, each block of bits being associated with a different secondary cell.

[0145]

[0158] Clause 28: The method of clause 27, wherein a block of bits associated with a secondary cell activated by a MAC CE indicates a temporary RS by indicating at least one trigger state from a per-carrier aperiodic trigger state list associated with that secondary cell.

[0146]

[0159] Clause 29. The method of clause 28, wherein the UE is configured to interpret a value of 0 for a block of bits as indicating that no temporary RS is triggered for a secondary cell associated with that block of bits.

[0147]

[0160] Clause 30: The method of any one of clauses 26 to 29, wherein a separate set of bits in the MAC CE indicates activated secondary cells.

[0148]

[0161] Clause 31: A method for wireless communication by a network entity, comprising: sending radio resource control (RRC) signaling to a user equipment (UE) to configure the UE for channel state information (CSI) reporting with a per-carrier aperiodic trigger state list of one or more types of reference signals (RS); and sending dynamic signaling indicating at least one trigger state from one of the per-carrier aperiodic trigger state lists associated with a secondary cell to trigger the UE to activate the secondary cell and monitor a temporary RS transmitted on the secondary cell based at least in part on at least one of the one or more RS configurations associated with the at least one trigger state.

[0149]

[0162] Clause 32: The method of clause 31, wherein the temporary RS includes at least one of a CSI-RS or a Tracking RS (TRS).

[0150]

[0163] Clause 33: The method of clause 31 or 32, wherein at least one of the one or more RS configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a per carrier associated with a secondary cell aperiodic trigger state list.

[0151]

[0164] Clause 34: The method of any one of clauses 31 to 33, wherein the dynamic signaling includes a medium access control (MAC) control element (CE) activating a secondary cell.

[0152]

[0165] Clause 35: The method of clause 34, wherein the dynamic signaling further comprises downlink control information (DCI) indicating at least one trigger condition.

[0153]

[0166] Clause 36: The method of clause 34 or 35, wherein the MAC CE also indicates at least one trigger condition.

[0154]

[0167] Clause 37: The method of clause 36, wherein the MAC CE includes a plurality of blocks of bits, each block of bits being associated with a different secondary cell.

[0155]

[0168] Clause 38: The method of clause 37, wherein a block of bits associated with a secondary cell activated by a MAC CE indicates a temporary RS by indicating at least one trigger state from a per-carrier aperiodic trigger state list associated with that secondary cell.

[0156]

[0169] Clause 39: The method of any one of clauses 36 to 38, wherein a separate set of bits in the MAC CE indicates activated secondary cells.

[0157]

[0170] Clause 40: An apparatus comprising a memory containing executable instructions and one or more processors configured to execute the executable instructions and cause the apparatus to perform a method according to any one of clauses 1 to 39.

[0158]

[0171] Clause 41: An apparatus comprising means for carrying out the method according to any one of clauses 1 to 39.

[0159]

[0172] Clause 42: A non-transitory computer-readable medium comprising executable instructions that, when executed by one or more processors of a device, cause the device to perform the method described in any one of clauses 1 to 39.

[0160]

[0173] Clause 43: A computer program product embodied on a computer-readable storage medium comprising code for performing the method according to any one of clauses 1 to 39.

[0161] Additional Wireless Communication Network Considerations

[0174] The techniques and methods described herein may be used for a variety of wireless communications networks (or Wireless Wide Area Networks (WWANs)) and Radio Access Technologies (RATs). Although aspects may be described herein using terminology commonly associated with 3G, 4G, and / or 5G (e.g., 5G New Radio (NR)) wireless technologies, aspects of the disclosure may be equally applicable to other communications systems and standards not explicitly mentioned herein.

[0162]

[0175] 5G wireless communication networks may support a variety of advanced wireless communication services, such as enhanced Mobile BroadBande (eMBB), millimeter Wave (mmWave), Machine Type Communication (MTC), and / or mission-critical targeted Ultra-Reliable, Low-Latency Communication (URLLC), etc. These services, etc., may include latency and reliability requirements.

[0163]

[0176] Returning to FIG. 1, various aspects of the disclosure may be performed within an exemplary wireless communication network 100.

[0164]

[0177] In 3GPP, the term "cell" can refer to a coverage area of ​​a NodeB and / or a narrowband subsystem serving this coverage area, depending on the context in which the term is used. In an NR system, "cell" and a network entity, next generation NodeB (gNB or gNodeB), access point (AP), distributed unit (DU), carrier, or transmission / reception point may be used interchangeably. A network entity may provide communication coverage for a macrocell, a picocell, a femtocell, and / or other types of cells.

[0165]

[0178] A macro cell may typically cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs with a service subscription. A pico cell may cover a relatively small geographic area (e.g., a sports stadium) and may allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs that have an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in the home, etc.). A network entity for a macro cell may be referred to as a macro Base Station (BS). A network entity for a pico cell may be referred to as a pico BS. A network entity for a femto cell may be referred to as a femto BS, a home BS, or a home NodeB.

[0166]

[0179] Network entities 102 configured for 4G LTE (collectively referred to as Evolved UMTS Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 through a first backhaul link 132 (e.g., an S1 interface). Network entities 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN)) may interface with the 5GC 190 via a second backhaul link 184. The network entities 102 may communicate with each other directly or indirectly (e.g., through the EPC 160 or 5GC 190) through a third backhaul link 134 (e.g., an X2 interface). The third backhaul link 134 may typically be wired or wireless.

[0167]

[0180] The wireless communications network 100 may subdivide the electromagnetic spectrum into various classes, bands, channels, or other characteristics. In some aspects, the subdivision is provided based on wavelength and frequency, where the frequencies may also be referred to as carriers, subcarriers, frequency channels, tones, or subbands. For example, 3GPP currently defines Frequency Range 1 (FR1) as including 410 MHz to 7125 MHz, which is often referred to (interchangeably) as "sub-6 GHz." Similarly, 3GPP currently defines Frequency Range 2 (FR2) as including 24250 MHz to 52600 MHz, which is sometimes referred to (interchangeably) as "millimeter wave" ("mmW" or "mmWave"). Network entities (e.g., mmWave network entities such as network entity 180) configured to communicate using mmWave / near-mmWave radio frequency bands may utilize beamforming (e.g., 182) with UEs (e.g., 104) to improve path loss and range.

[0168]

[0181] The small cell 102' may operate in a licensed and / or unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell 102' may employ NR and may use the same 5 GHz unlicensed frequency spectrum used by the Wi-Fi AP 150. A small cell 102' employing NR in the unlicensed frequency spectrum may provide increased coverage to and / or increase the capacity of an access network.

[0169]

[0182] Some network entities, such as the gNB 180, may operate in conventional sub-6 GHz spectrum, millimeter wave (mmWave) frequencies, and / or near-mmWave frequencies in communicating with the UE 104. When the gNB 180 is operating on mmWave or near-mmWave frequencies, the gNB 180 may be referred to as an mmWave network entity.

[0170]

[0183] The communication link 120 between the network entity 102 and, for example, the UE 104, may be via one or more carriers. The network entity 102 and the UE 104 may use spectrum with up to YMHz (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.) of bandwidth per carrier allocated in carrier aggregation with up to YxMHz (x component carriers) in total used for transmission in each direction. The carriers may be adjacent or non-adjacent to each other. The carrier allocation may be asymmetric for DL ​​and UL (e.g., more or fewer carriers may be allocated for DL ​​than UL). The component carriers may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0171]

[0184] The wireless communication network system 100 further includes a Wi-Fi access point (AP) 150 in communication with Wi-Fi stations (STAs) 152 over communication links 154 in an unlicensed frequency spectrum, e.g., 2.4 GHz and / or 5 GHz. When communicating in the unlicensed frequency spectrum, the STAs 152 / AP 150 may perform a Clear Channel Assessment (CCA) prior to communication to determine whether a channel is available.

[0172]

[0185] Particular UEs 104 may communicate with each other using Device-to-Device (D2D) communication links 158. The D2D communication links 158 may use DL / UL WWAN spectrum. The D2D communication links 158 may use one or more sidelink channels, such as a Physical Sidelink Broadcast CHannel (PSBCH), a Physical Sidelink Discovery CHannel (PSDCH), a Physical Sidelink Shared CHannel (PSSCH), and a Physical Sidelink Control CHannel (PSCCH). The D2D communication may be via various wireless D2D communication systems, such as FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the IEEE 802.11 standard, 4G (e.g., LTE), or 5G (e.g., NR), to name a few options.

[0173]

[0186] The EPC 160 may include a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and a Packet Data Network (PDN) Gateway 172. The MME 162 may be in communication with a Home Subscriber Server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management.

[0174]

[0187] Generally, user Internet protocol (IP) packets are forwarded through a Serving Gateway 166, which itself is connected to a PDN Gateway 172. The PDN Gateway 172 provides UE IP address allocation as well as other functions. The PDN Gateway 172 and the BM-SC 170 are connected to IP Services 176, which may include, for example, the Internet, an Intranet, an IP Multimedia Subsystem (IMS), PS streaming services, and / or other IP services.

[0175]

[0188] The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may act as an entry point for content provider MBMS transmissions and may be used to authorize and initiate MBMS bearer services in a Public Land Mobile Network (PLMN) and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to deliver MBMS traffic to network entities 102 that belong to a Multicast Broadcast Single Frequency Network (MBSFN) area that broadcasts a particular service and may be responsible for session management (start / stop) and collecting eMBMS related charging information.

[0176]

[0189] The 5GC 190 may include an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. The AMF 192 may be in communication with a Unified Data Management (UDM) 196.

[0177]

[0190] The AMF 192 is generally a control node that handles signaling between the UE 104 and the 5GC 190. Generally, the AMF 192 provides QoS flow and session management.

[0178]

[0191] All user Internet Protocol (IP) packets are forwarded through UPF 195, which connects to IP services 197 and provides UE IP address allocation as well as other functions for 5GC 190. IP services 197 may include, for example, the Internet, intranet, IP Multimedia Subsystem (IMS), PS streaming services, and / or other IP services.

[0179]

[0192] Turning now to FIG. 2, various example components of the network entity 102 and the UE 104 (eg, the wireless communication network 100 of FIG. 1) that may be used to implement aspects of the present disclosure are illustrated.

[0180]

[0193] In the network entity 102, the transmit processor 220 may receive data from a data source 212 and control information from the controller / processor 240. The control information may be for a Physical Broadcast CHannel (PBCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), a Physical Downlink Control CHannel (PDCCH), a Group Common PDCCH (GC PDCCH), etc. In some examples, the data may be for a Physical Downlink Shared Channel (PDSCH).

[0181]

[0194] A Medium Access Control (MAC) Control Element (MAC-CE) is a MAC layer communication construct that may be used to control command exchanges between wireless nodes. The MAC-CE may be carried within a shared channel, such as a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), or a Physical Sidelink Shared Channel (PSSCH).

[0182]

[0195] The processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. The transmit processor 220 may also generate reference symbols for a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a PBCH Demodulation Reference Signal (DMRS), and a Channel State Information Reference Signal (CSI-RS), etc.

[0183]

[0196] A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, and / or reference symbols, if applicable, and may provide output symbol streams to modulators (MODs) in transceivers 232a-t. Each modulator in transceivers 232a-t may process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The downlink signals from the modulators in transceivers 232a-t may be transmitted via antennas 234a-t, respectively.

[0184]

[0197] At the UE 104, the antennas 252a-252r may receive downlink signals from the network entity 102 and may provide received signals to demodulators (DEMODs) 254a-254r, respectively, within the transceivers. Each demodulator within the transceivers 254a-254r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples (e.g., for OFDM) to obtain received symbols.

[0185]

[0198] A MIMO detector 256 may obtain received symbols from all demodulators in transceivers 254a-254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate, deinterleave, and decode) the detected symbols and provide decoded data for the UE 104 to a data sink 260 and provide decoded control information to the controller / processor 280.

[0186]

[0199] On the uplink, at the UE 104, a transmit processor 264 may receive and process data (e.g., for the Physical Uplink Shared Channel (PUSCH)) from a data source 262 and control information (e.g., for the Physical Uplink Control Channel (PUCCH)) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for a reference signal (e.g., for a Sounding Reference Signal (SRS)). The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators in the transceivers 254a-254r (e.g., for SC-FDM), and transmitted to the network entity 102.

[0187]

[0200] At the network entity 102, uplink signals from the UE 104 may be received by the antennas 234a-t, processed by demodulators in the transceivers 232a-t, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information transmitted by the UE 104. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240.

[0188]

[0201] The memories 242 and 282 may store data and program codes for the network entity 102 and the UE 104, respectively.

[0189]

[0202] A scheduler 244 may schedule UEs for data transmission on the downlink and / or uplink.

[0190]

[0203] 5G may utilize Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) on the uplink and downlink. 5G may also support half-duplex operation using Time Division Duplexing (TDD). OFDM and Single-Carrier Frequency Division Multiplexing (SC-FDM) partition the system bandwidth into multiple orthogonal subcarriers, also commonly referred to as tones, bins, etc. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers may be fixed, and the total number of subcarriers may depend on the system bandwidth. The minimum resource allocation, called a Resource Block (RB), may be 12 contiguous subcarriers in some examples. The system bandwidth may also be partitioned into subbands. For example, a subband may cover multiple RBs. NR may support a base SubCarrier Spacing (SCS) of 15 KHz, and other SCSs (e.g., 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc.) may be defined relative to the base SCS.

[0191]

[0204] As noted above, FIGS. 3A-3D illustrate various example aspects of data structures for a wireless communications network, such as wireless communications network 100 of FIG.

[0192]

[0205] In various aspects, the 5G frame configuration may be Frequency Division Duplex (FDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated to either DL or UL. The 5G frame configuration may also be Time Division Duplex (TDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within the set of subcarriers are dedicated to both DL and UL. In the example provided by Figures 3A, 3C, the 5G frame configuration is assumed to be TDD, subframe 4 is configured with slot format 28 (which is mostly DL), where D is DL, U is UL, and X is flexible in use between DL / UL, and subframe 3 is configured with slot format 34 (which is mostly UL). Subframes 3 and 4 are shown with slot formats 34 and 28, respectively, but any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are all DL and all UL, respectively. The other slot formats 2-61 contain a mix of DL, UL and flexible symbols. The UE is configured with the slot format through the received Slot Format Indicator (SFI) (either dynamically through DL Control Information (DCI) or semi-statically / statically through Radio Resource Control (RRC) signaling). Note that the following description also applies to 5G frame configurations, which are TDD.

[0193]

[0206] Other wireless communication technologies may have different frame configurations and / or different channels. A frame (10 ms) may be divided into 10 equally sized subframes (1 ms). Each subframe may include one or more time slots. A subframe may also include a minislot, which may include 7, 4, or 2 symbols. In some examples, each slot may include 7 or 14 symbols depending on the slot configuration.

[0194]

[0207] For example, in slot configuration 0, each slot may contain 14 symbols, and in slot configuration 1, each slot may contain 7 symbols. The symbols on the DL may be Cyclic Prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or Discrete Fourier Transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also called Single Carrier Frequency-Division Multiple Access (SC-FDMA) symbols) (for power-limited scenarios, i.e., limited to single stream transmission).

[0195]

[0208] The number of slots in a subframe is based on the slot configuration and numerology. In slot configuration 0, the different numerologies (μ) 0-5 allow 1, 2, 4, 8, 16, and 32 slots per subframe, respectively. In slot configuration 1, the different numerologies 0-2 allow 2, 4, and 8 slots per subframe, respectively. Thus, for slot configuration 0 and numerology μ, there are 14 symbols / slot and 2μ slots / subframe. Subcarrier spacing and symbol length / period are functions of numerology. Subcarrier spacing is 2 μ×15 kHz, where μ is a numerology from 0 to 5. Thus, numerology μ=0 has a subcarrier spacing of 15 kHz and numerology μ=5 has a subcarrier spacing of 480 kHz. The symbol length / period is inversely proportional to the subcarrier spacing. Figures 3A-3D provide an example of a slot configuration 0 with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol period is approximately 16.67 μs.

[0196]

[0209] A resource grid may be used to represent the frame structure. Each time slot contains Resource Blocks (RBs) (also called Physical RBs (PRBs)), which span 12 consecutive subcarriers. The resource grid is divided into multiple Resource Elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0197]

[0210] As shown in Figure 3A, some of the REs carry reference (pilot) signals (RS) for the UE (e.g., UE 104 in Figures 1 and 2). The RS may include Demodulation RS (DM-RS) (shown as Rx for one particular configuration where 100x is the port number, but other DM-RS configurations are possible) and Channel State Information Reference Signals (CSI-RS) for channel estimation at the UE. The RS may also include Beam Measurement RS (BRS), Beam Refinement RS (BRRS), and Phase Tracking RS (PT-RS).

[0198]

[0211] 3B shows an example of various DL channels within a subframe of a frame. The Physical Downlink Control Channel (PDCCH) carries DCI in one or more control channel elements (CCEs), each CCE containing 9 RE Groups (REGs), each REG containing 4 consecutive REs within one OFDM symbol.

[0199]

[0212] A primary synchronization signal (PSS) may be present in symbol 2 of a particular subframe of a frame. The PSS is used by the UE (e.g., 104 in FIGS. 1 and 2) to determine subframe / symbol timing and physical layer identification information.

[0200]

[0213] A Secondary Synchronization Signal (SSS) may be present in symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the group number of the physical layer cell identity and the timing of the radio frame.

[0201]

[0214] Based on the physical layer identity and the group number of the physical layer cell identity, the UE can determine the physical cell identifier (PCI). Based on the PCI, the UE can determine the location of the above-mentioned DM-RS. The physical broadcast channel (PBCH), which carries the master information block (MIB), can be logically grouped with the PSS and the SSS to form a synchronization signal (SS) / PBCH block. The MIB provides the number of RBs in the system bandwidth and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information that is not transmitted over the PBCH, such as system information blocks (SIBs), and paging messages.

[0202]

[0215] As shown in FIG. 3C, some of the REs carry DM-RS (denoted as R for one particular configuration, but other DM-RS configurations are possible) for channel estimation at the network entity. The UE may transmit DM-RS for the physical uplink control channel (PUCCH) and DM-RS for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first one or two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short or long PUCCH is transmitted and depending on the specific PUCCH format used. The UE may transmit a sounding reference signal (SRS). The SRS may be transmitted in the last symbol of a subframe. The SRS may have a comb configuration, and the UE can transmit the SRS in one of the combs. The SRS may be used for channel quality estimation by the network entity to enable frequency-dependent scheduling on the UL.

[0203]

[0216] 3D shows an example of various UL channels within a subframe of a frame. The PUCCH, in one configuration, may be arranged as shown. The PUCCH carries Uplink Control Information (UCI), such as scheduling requests, Channel Quality Indicators (CQI), Precoding Matrix Indicators (PMI), Rank Indicators (RI), and HARQ ACK / NACK feedback. The PUSCH may be used to carry data and also to carry Buffer Status Reports (BSR), Power Headroom Reports (PHR), and / or UCI.

[0204] Additional Considerations

[0217] The above description provides an example of monitoring a temporary reference signal (RS) on a secondary cell (SCell) based on an RS configuration associated with a trigger condition in a communication system. The foregoing description is provided to enable any person skilled in the art to practice various aspects described herein. The embodiments described herein are not intended to limit the scope, applicability, or aspects described in the claims. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, changes may be made in the function and arrangement of the elements described without departing from the scope of the disclosure. Various embodiments may omit, substitute, or add various procedures or components as appropriate. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Also, features described with respect to some embodiments may be combined in several other embodiments. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects described herein. Moreover, the scope of the disclosure is intended to encompass such devices or methods that are implemented using other structures, functions, or structures and functions in addition to or other than the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0205]

[0218] The techniques described herein may be used for various wireless communication technologies, such as 5G (e.g., 5G NR), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology, such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). An OFDMA network may implement a radio technology such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are releases of UMTS that use E-UTRA.UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). NR is a new wireless communications technology under development.

[0206]

[0219] The various example logic blocks, modules, and circuits described in connection with this disclosure may be implemented or performed using a general purpose processor, a DSP, an ASIC, a Field Programmable Gate Array (FPGA) or other Programmable Logic Device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, a System on a Chip (SoC), or any other such configuration.

[0207]

[0220] When implemented in hardware, an exemplary hardware configuration may comprise a processing system in a wireless node. The processing system may be implemented using a bus architecture. The bus may include any number of interconnected buses and bridges depending on the particular application of the processing system and the overall design constraints. The bus may link various circuits including a processor, a machine-readable medium, and a bus interface. The bus interface may be used to connect a network adapter to the processing system via the bus, among other things. The network adapter may be used to implement the signal processing functions of the PHY layer. In the case of user equipment (see FIG. 1), a user interface (e.g., keypad, display, mouse, joystick, touch screen, biometric sensor, proximity sensor, light emitting element, etc.) may also be connected to the bus. The bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are known in the art and therefore will not be described further. The processor may be implemented using one or more general-purpose and / or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits capable of executing software. Those skilled in the art will recognize how to best implement the described functionality for a processing system depending on the particular application and the overall design constraints imposed on the overall system.

[0208]

[0221] If implemented in software, the functions may be stored and transmitted as one or more instructions or code on a computer-readable medium. Software shall be broadly construed to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise. Computer-readable media includes both computer storage media and communication media, including any medium that facilitates transfer of a computer program from one place to another. A processor may be responsible for general processing, including managing a bus and executing software modules stored on a machine-readable storage medium. A computer-readable storage medium may be coupled to a processor such that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium may be integral to the processor. By way of example, a machine-readable medium may include a transmission line, a carrier wave modulated with data, and / or a computer-readable storage medium on which instructions are stored separately from a wireless node, all of which may be accessed by a processor through a bus interface. Alternatively or additionally, the machine-readable medium, or any portion thereof, may be integrated into the processor, such as in the case of a cache and / or a general purpose register file. Examples of machine-readable storage media may include, by way of example only, Random Access Memory (RAM), Flash memory, Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof. The machine-readable medium may be embodied in a computer program product.

[0209]

[0222] A software module may include a single instruction or many instructions, and may be distributed across several different code segments, among different programs, and across multiple storage media. A computer-readable medium may comprise several software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a transmitting module and a receiving module. Each software module may reside in a single storage device or may be distributed across multiple storage devices. As an example, a software module may be loaded into RAM from a hard drive when a trigger event occurs. During execution of a software module, a processor may load some of the instructions into a cache to increase access speed. One or more cache lines may then be loaded into a general-purpose register file for execution by the processor. When referring to a function of a software module below, it will be understood that such function is executed by a processor upon executing instructions from that software module.

[0210]

[0223] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. By way of example, "at least one of a, b, or c" is intended to encompass a, b, c, ab, ac, bc, and abc, as well as any combination having multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other permutation of a, b, and c).

[0211]

[0224] As used herein, the term "determining" encompasses a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, database, or another data structure), ascertaining, etc. Also, "determining" can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. Also, "determining" can include resolving, selecting, choosing, establishing, etc.

[0212]

[0225] The methods disclosed herein include one or more steps or actions for achieving the method. The steps and / or actions of those methods may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions may be modified without departing from the scope of the claims. Furthermore, various operations of the methods described above may be performed by any suitable means capable of performing the corresponding functions. Those means may include various hardware and / or software component(s) including, but not limited to, circuits, application specific integrated circuits (ASICs), or processors, and / or various hardware and / or software module(s). In general, when operations are illustrated in figures, those operations may have corresponding equivalent means and functions similarly numbered.

[0213]

[0226] The following claims are not intended to be limited to the embodiments set forth herein, but are to be accorded the full scope consistent with the language of the claims. Within the claims, reference to an element in the singular is not intended to mean "only one" unless expressly stated as such, but rather "one or more." The term "several" refers to one or more, unless expressly stated otherwise. No element of a claim is to be construed under the provisions of 35 U.S.C. 112(f) unless the element is expressly recited using the phrase "means of" or, in the case of a method claim, unless the element is recited using the phrase "step of." All structural and functional equivalents to the elements of the various embodiments described throughout this disclosure that are known or later become known to those skilled in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Additionally, nothing disclosed herein is intended for public disclosure, regardless of whether such disclosure is expressly recited in the claims.

Claims

1. 1. A method for wireless communication by a user equipment (UE), comprising: receiving radio resource control (RRC) signaling that configures the UE with one or more per-carrier reference signal (RS) configurations; activating a secondary cell and receiving dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations, wherein the at least one of the one or more per-carrier RS ​​configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a per-carrier aperiodic trigger state list associated with the secondary cell; monitoring a temporary RS on the secondary cell based at least in part on the at least one of the one or more RS configurations indicated by the dynamic signaling; A method comprising:

2. The method of claim 1 , wherein the temporary RS includes at least one of a CSI-RS or a tracking RS (TRS).

3. The method of claim 1 , wherein the dynamic signaling includes a medium access control (MAC) control element (CE) that activates the secondary cell.

4. The method of claim 4 , wherein the dynamic signaling further comprises downlink control information (DCI) indicating at least one trigger condition.

5. The method of claim 4 , wherein the MAC CE indicates at least one trigger condition.

6. The method of claim 4 , wherein the MAC CE comprises a block of bits associated with the secondary cell.

7. The method of claim 7 , wherein the block of bits identifies the at least one of the one or more RS configurations that indicates the temporary RS.

8. The method of claim 7 , wherein a value of 0 in the block of bits indicates that a temporary RS is not used for the secondary cell.

9. The MAC CE activates a plurality of secondary cells; 5. The method of claim 4, wherein the MAC CE includes multiple blocks of bits, each of the blocks of bits associated with a different secondary cell of the multiple secondary cells activated by the MAC CE.

10. 1. A method for wireless communication by a network entity, comprising: transmitting radio resource control (RRC) signaling to configure a user equipment (UE) with one or more per-carrier reference signal (RS) configurations; activating a secondary cell and transmitting dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations for temporary RS transmission on the secondary cell, wherein the at least one of the one or more RS configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a per-carrier aperiodic trigger state list associated with the secondary cell; A method comprising:

11. The method of claim 10 , wherein the dynamic signaling includes a Medium Access Control (MAC) control element (CE) that activates the secondary cell.

12. 12. The method of claim 11, wherein the MAC CE indicates at least one trigger condition, the MAC CE including multiple blocks of bits, each block of bits associated with a different secondary cell.

13. The method of claim 12 , wherein the network entity is configured to set a block of bits to a value of 0 to indicate that no temporary RS is used for the secondary cell.

14. 1. An apparatus for wireless communication, comprising: at least one processor; a memory coupled to the at least one processor; and wherein the memory provides the device with: receiving radio resource control (RRC) signaling to configure a user equipment (UE) with one or more per-carrier reference signal (RS) configurations; activating a secondary cell to receive dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations, wherein the at least one of the one or more per-carrier RS ​​configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a per-carrier aperiodic trigger state list associated with the secondary cell; causing monitoring of a temporary RS on the secondary cell based at least in part on the at least one of the one or more RS configurations indicated by the dynamic signaling. An apparatus comprising code executable by said at least one processor.

15. 1. An apparatus for wireless communication, comprising: at least one processor; a memory coupled to the at least one processor; and wherein the memory provides the device with: causing a user equipment (UE) to transmit radio resource control (RRC) signaling to configure the user equipment (UE) with one or more per-carrier reference signal (RS) configurations, wherein the at least one of the one or more RS configurations associated with at least one trigger state includes an RS configuration associated with a CSI reporting configuration of a carrier in a per-carrier aperiodic trigger state list associated with the secondary cell; activating a secondary cell and causing it to transmit dynamic signaling indicating at least one of the one or more per-carrier RS ​​configurations for temporary RS transmission on the secondary cell; An apparatus comprising code executable by said at least one processor.

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