Synchronization signal block burst periodicity adaptation indicator
Patent Information
- Application Number
- PCT/CN2026/079712
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-26
- Filing Date
- 2026-02-24
- Publication Date
- 2026-10-01
Smart Images

Figure CN2026079712_01102026_PF_FP_ABST
Abstract
Description
SYNCHRONIZATION SIGNAL BLOCK BURST PERIODICITY ADAPTATION INDICATORCROSS-REFERENCE TO RELATED APPLICATION
[0001] This Patent Application claims priority to Patent Cooperation Treaty (PCT) Application No. PCT / CN2025 / 084865, filed on March 26, 2025, entitled “SYNCHRONIZATION SIGNAL BLOCK BURST PERIODICITY ADAPTATION INDICATOR, ” and assigned to the assignee hereof. The disclosure of the prior Application is considered part of and is incorporated by reference into this Patent Application. FIELD OF THE DISCLOSURE
[0002] Aspects of the present disclosure generally relate to wireless communication and specifically relate to techniques, apparatuses, and methods associated with a synchronization signal block burst periodicity adaptation indicator. DESCRIPTION OF THE RELATED TECHNOLOGY
[0003] Wireless communication systems are widely deployed to provide various services, which may involve carrying or supporting voice, text, other messaging, video, data, or other traffic. Typical wireless communication systems may employ multiple-access radio access technologies (RATs) capable of supporting communication among multiple wireless communication devices including user devices or other devices by sharing the available system resources (for example, time domain resources, frequency domain resources, spatial domain resources, or device transmit power, among other examples) . Such multiple-access RATs are supported by technological advancements that have been adopted in various telecommunication standards, which define common protocols that enable different wireless communication devices to communicate on a local, municipal, national, regional, or global level. An example telecommunication standard is New Radio (NR) . NR, which also may be referred to as 5G, is part of a continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) . As the demand for connectivity continues to increase, further improvements in NR may be implemented, and other RATs, such as 6G and beyond, may be introduced to enable new applications and facilitate new use cases.
[0004] In some examples, wireless communication devices may synchronize with one another using a synchronization signal block (SSB) hierarchy. The SSB hierarchy may include an SSB burst set, which may include multiple SSB bursts. Each SSB burst may include one or more SSBs. In some aspects, different SSBs may be beam-formed differently (e.g., transmitted using different beams) , and may be used for cell search, cell acquisition, beam management, or beam selection (e.g., as part of an initial network access procedure) . An SSB burst set may be periodically transmitted by a wireless node (e.g., a network node) . In some aspects, an SSB burst set may have a fixed or dynamic length. In some cases, an SSB burst set or an SSB burst may be referred to as a discovery reference signal (DRS) transmission window or an SSB measurement time configuration (SMTC) window.SUMMARY
[0005] The systems, methods, and devices of this disclosure each have several innovative aspects, no single one of which is solely responsible for the desirable attributes disclosed herein.
[0006] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE) . The method may include receiving configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation information position indicator that indicates a starting position of an information block in a downlink control information (DCI) message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The method may include receiving the DCI message. The method may include identifying an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information. The method may include measuring SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.
[0007] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include transmitting, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The method may include transmitting, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information.
[0008] Some aspects described herein relate to a UE. The UE may include a processing system. The processing system may include one or more processors and one or more code-storing memories coupled with the one or more processors. The processing system may be configured to cause the UE to receive configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The processing system may be configured to cause the UE to receive the DCI message. The processing system may be configured to cause the UE to identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information. The processing system may be configured to cause the UE to measure SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.
[0009] Some aspects described herein relate to a network node. The network node may include a processing system. The processing system may include one or more processors and one or more code-storing memories coupled with the one or more processors. The processing system may be configured to cause the network node to transmit, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The processing system may be configured to cause the network node to transmit, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information.
[0010] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The set of instructions, when executed by one or more processors of the UE, may cause the UE to receive the DCI message. The set of instructions, when executed by one or more processors of the UE, may cause the UE to identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information. The set of instructions, when executed by one or more processors of the UE, may cause the UE to measure SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.
[0011] Some aspects described herein relate to a non-transitory computer-readable medium that stores a set of instructions for wireless communication by a network node. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The set of instructions, when executed by one or more processors of the network node, may cause the network node to transmit, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information.
[0012] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for receiving configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the apparatus. The apparatus may include means for receiving the DCI message. The apparatus may include means for identifying an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information. The apparatus may include means for measuring SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.
[0013] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for transmitting, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The apparatus may include means for transmitting, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information.
[0014] Aspects of the present disclosure may generally be implemented by or as a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, network node, wireless communication device, or processing system as substantially described in the Detailed Description with reference to, and as illustrated by, the accompanying drawings. Details of one or more implementations of the subject matter described in this disclosure are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages will become apparent from the description, the drawings, and the claims. Note that the relative dimensions of the following figures may not be drawn to scale.BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Fig. 1 is a diagram illustrating an example of a wireless communication network.
[0016] Fig. 2 is a diagram illustrating an example disaggregated network node architecture.
[0017] Fig. 3 is a diagram illustrating an example of a synchronization signal block (SSB) hierarchy.
[0018] Figs. 4A-4E are examples associated with SSB bursts in a secondary serving cell.
[0019] Figs. 5A-5C are diagrams of examples associated with SSB burst periodicity adaptation.
[0020] Fig. 6 is a diagram illustrating an example process performed, for example, at a user equipment (UE) or an apparatus of a UE.
[0021] Fig. 7 is a diagram illustrating an example process performed, for example, at a network node or an apparatus of a network node.
[0022] Fig. 8 is a diagram of an example apparatus for wireless communication.
[0023] Fig. 9 is a diagram of another example apparatus for wireless communication.DETAILED DESCRIPTION
[0024] In modern wireless communication systems, there is an ongoing effort to enhance network energy efficiency, particularly in the context of New Radio (NR) systems. One aspect of this effort involves improving the operation of synchronization signal blocks (SSBs) in secondary cells (SCells) for user equipments (UEs) configured with carrier aggregation (CA) in a connected mode. SSBs, which may be used for UE time and frequency synchronization, layer 1 (L1) or layer 3 (L3) measurements, SCell activation, or similar purposes, traditionally are transmitted periodically within cells, sometimes referred to as always-on SSBs (AO-SSBs) . However, sole reliance on AO-SSBs may lead to unnecessary energy consumption when UEs do not require constant synchronization or measurement updates. Accordingly, to save energy or for similar purposes, network nodes or UEs may support on-demand SSB (OD-SSB) SCell operation. OD-SSBs are SSBs that are triggered or transmitted in an SCell only when needed, such as when activating an SCell or when the SCell is activated, among other examples. Accordingly, a network node may trigger a UE to receive OD-SSB bursts (e.g., via a medium access control (MAC) control element (MAC-CE) or radio resource control (RRC) signaling, among other examples) with a given periodicity (sometimes referred to herein as an OD-SSB burst periodicity, or, more simply, an SSB burst periodicity) , and the network node may later trigger the UE to cease reception of the OD-SSB bursts, such as when the SCell is deactivated, among other examples.
[0025] In some examples, it may be desirable to adapt an SSB burst periodicity in the time domain, such as for a purpose of changing the frequency at which SSB bursts are transmitted in response to changing channel conditions, current SCell status (e.g., activated or deactivated) , measurement needs of the various network devices, network energy savings (NES) considerations, or similar factors. However, adaptation of SSB burst periodicities in the time domain may require coordination between network nodes and UEs in order to ensure proper synchronization and system functionality. Accordingly, there remains a need for mechanisms to configure and signal SSB burst periodicity adaptation in SCells, such as signaling mechanisms to indicate SSB burst periodicity adaptation in a manner that supports NES while maintaining synchronization and measurement accuracy for connected mode UEs.
[0026] Various aspects relate generally to improving energy efficiency in wireless communication systems by adapting SSB burst periodicity for SCells for UEs configured with CA. Some aspects more specifically relate to configuration information and signaling used to transmit SSB burst periodicity adaptation information from a network node to a UE. In some aspects, a UE may receive configuration information that includes an SSB burst periodicity adaptation indicator, which informs the UE regarding whether an information block in a DCI message includes SSB burst periodicity adaptation information for an associated secondary serving cell, and / or an SSB burst periodicity adaptation information position indicator that indicates a starting position of the information block in a DCI message that includes the SSB burst periodicity adaptation information for the associated secondary serving cell. In some aspects, the SSB burst periodicity adaptation indicator may signify that the information block in the DCI message contains a certain quantity of bits related to the SSB burst periodicity adaptation information or that the SSB burst periodicity adaption information is not present in the DCI message for the associated secondary serving cell. The UE may thus receive the DCI message, may identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information or the SSB burst periodicity adaptation information, and may measure SSBs in the secondary serving cell according to the applicable SSB burst periodicity. In some aspects, the configuration information may indicate a set of candidate SSB burst periodicities for the secondary serving cell, and the applicable SSB burst periodicity may be a selected one of the set of candidate SSB burst periodicities. In such aspects, the size of the set of candidate SSB burst periodicities may be fixed according to a predefined rule, may be indicated by a common configuration applicable to all secondary cells, or may be indicated by a dedicated configuration specific to the secondary cell.
[0027] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some examples, the described techniques can be used to adapt SSB burst periodicity in a manner that supports NES by reducing unnecessary SSB transmissions. This efficient utilization of the transmission power resources corresponds to a more sustainable network operation and leads to the conservation of energy resources. In some other examples, the described techniques can be used to dynamically adjust the SSB burst periodicity to align the network’s operations with the actual requirements of the UEs and the prevailing network conditions, which may conserve processing resources and network resources because less frequent SSB transmissions may be used when conditions permit. For example, by monitoring factors such as UE activity, mobility patterns, and traffic load, the network may dynamically adjust the frequency of SSB transmissions to ensure that synchronization and measurement opportunities are provided only as needed. This adaptive approach enables the network to minimize unnecessary signaling, thereby conserving energy and processing resources, while maintaining robust connectivity and operational efficiency in varying radio environments. In some other examples, the described techniques can be used to enable improved communications between the network node and the UE, thus enhancing a wireless communication system’s reliability and facilitating energy-efficient practices in next-generation wireless networks without compromising the robustness of synchronization and measurement processes. In this way, the techniques and aspects described herein may conserve processing resources, memory resources, network resources, or the like.
[0028] 5G NR may support enhanced mobile broadband (eMBB) access, Internet of Things (IoT) networks or reduced capability (RedCap) device deployments, ultra-reliable low-latency communication (URLLC) applications, or massive machine-type communication (mMTC) , among other examples. To support these and other target verticals, a wireless communication system may be designed to implement a modularized functional infrastructure, a disaggregated and service-based network architecture, network function virtualization, network slicing, multi-access edge computing, millimeter wave (mmWave) technologies including massive multiple-input multiple-output (MIMO) , beamforming, IoT device or RedCap device connectivity and management, industrial connectivity, licensed and unlicensed spectrum access, sidelink and other device-to-device direct communication (for example, cellular vehicle-to-everything (CV2X) communication) , frequency spectrum expansion, overlapping spectrum use, small cell deployments, non-terrestrial network (NTN) deployments, device aggregation, advanced duplex communication (for example, sub-band full-duplex (SBFD) ) , multiple-subscriber implementations, high-precision positioning, radio frequency (RF) sensing, NES, low-power signaling and radios, or artificial intelligence or machine learning (AI / ML) , among other examples.
[0029] The foregoing and other technological improvements may support use cases, such as wireless fronthauls, wireless midhauls, wireless backhauls, wireless data centers, extended reality (XR) and metaverse applications, meta services for supporting vehicle connectivity, holographic and mixed reality communication, autonomous and collaborative robots, vehicle platooning and cooperative maneuvering, sensing networks, gesture monitoring, human-brain interfacing, digital twin applications, asset management, and universal coverage applications using non-terrestrial or aerial platforms, among other examples.
[0030] The methods, operations, apparatuses, and techniques described herein may enable one or more of the foregoing technologies or new technologies or support one or more of the foregoing use cases or new use cases.
[0031] Fig. 1 is a diagram illustrating an example of a wireless communication network 100. The wireless communication network 100 may be or may include elements of a 5G network or a 6G network, among other examples. The wireless communication network 100 may include multiple network nodes 110. For example, in Fig. 1, the wireless communication network 100 includes multiple network nodes 110, including a network node 110a and a network node 110b (each of which also may be referred to herein simply as a “network node 110” ) . The network nodes 110 may support communications with multiple UEs 120. For example, in Fig. 1, the network nodes 110 support communication with a UE 120a, a UE 120b, and a UE 120c (each of which also may be referred to herein simply as a “UE 120” ) . In some examples, a UE 120 also may communicate with other UEs 120 and a network node 110 also may communicate with a core network and with other network nodes 110.
[0032] The network nodes 110 and the UEs 120 of the wireless communication network 100 communicate using the electromagnetic spectrum, which may be subdivided into various licensed or unlicensed operating bands, frequency ranges, component carriers, or channels that define associated frequencies available for communications. In some examples, each of the network nodes 110 and the UEs 120 may communicate using one or multiple component carriers in one or more operating bands or ranges. Typically, various operating bands are defined as frequency range designations FR1 (410 MHz through 7.125 GHz) , FR2 (24.25 GHz through 52.6 GHz) , FR3 (7.125 GHz through 24.25 GHz) , FR4a or FR4-1 (52.6 GHz through 71 GHz) , FR4 (52.6 GHz through 114.25 GHz) , and FR5 (114.25 GHz through 300 GHz) . Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “sub-6 GHz” band in some documents and articles. Similarly, FR2 is often referred to (interchangeably) as a “millimeter wave” band in some documents and articles.
[0033] A network node 110 or a UE 120 may include one or more devices, components, or systems that enable communication with other devices, components, or systems of the wireless communication network 100. For example, a UE 120 and a network node 110 may each include one or more chips, system-on-chips (SoCs) , chipsets, packages, or devices that individually or collectively constitute or comprise a processing system. As shown in Fig. 1, each UE 120 includes a processing system 140 and each network node 110 includes a processing system 145. A processing system (for example, the processing system 140 or the processing system 145) includes processor (or “processing” ) circuitry in the form of one or multiple processors, microprocessors, processing units (such as central processing units (CPUs) , graphics processing units (GPUs) , neural processing units (NPUs) (also referred to as neural network processors or deep learning processors (DLPs) ) , or digital signal processors (DSPs) ) , processing blocks, application-specific integrated circuits (ASICs) , programmable logic devices (PLDs) , or other discrete gate or transistor logic or circuitry (any one or more of which may be generally referred to herein individually as a “processor” or collectively as “the processor” or “the processor circuitry” ) . Such processors may be individually or collectively configurable or configured to perform various functions or operations described herein. A group of processors collectively configurable or configured to perform a set of functions may include a first processor configurable or configured to perform a first function of the set and a second processor configurable or configured to perform a second function of the set. In some other examples, each of a group of processors may be configurable or configured to perform a same set of functions.
[0034] The processing system 140 and the processing system 145 may each include memory circuitry in the form of one or multiple memory devices, memory blocks, memory elements, or other discrete gate or transistor logic or circuitry, each of which may include or implement tangible storage media, such as random-access memory, or read-only memory, or combinations thereof (any one or more of which may be generally referred to herein individually as a “memory” or collectively as “the memory” or “the memory circuitry” ) . One or more of the memories may be coupled (for example, operatively coupled, communicatively coupled, electronically coupled, or electrically coupled) with one or more of the processors. One or more of the memories may individually or collectively store processor-executable code or instructions (such as software) (for example, which may be referred to as “one or more code-storing memories” or “code-storing memory circuitry” ) . For example, “code-storing memory” or “code-storing memory circuitry” refers to memory (or memory circuitry) that is configured to store processor-executable code or instructions. The processor-executable code or instructions, when executed by one or more of the processors, may configure one or more of the processors (or processing circuitry) to perform various functions or operations described herein. Additionally, or alternatively, in some examples, one or more of the processors may be configured to perform various functions or operations described herein without requiring configuration by software. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, or functions, among other examples, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
[0035] The processing system 140 and the processing system 145 may each include or be coupled with one or more modems (such as a cellular (for example, a 5G or 6G compliant) modem) . In some examples, one or more processors of the processing system 140 or the processing system 145 may include or implement one or more of the modems. The processing system 140 and the processing system 145 also may include or be coupled with multiple radios (collectively “the radio” ) , multiple RF chains, or multiple transceivers, each of which may in turn be coupled with one or more of multiple antennas. In some examples, one or more processors of the processing system 140 or the processing system 145 may include or implement one or more of the radios, RF chains, or transceivers. An RF chain may include one or more filters, mixers, oscillators, amplifiers, analog-to-digital converters (ADCs) , or other devices that convert between an analog signal (such as for transmission or reception via an air interface) and a digital signal (such as for processing by the processing system 140 or by the processing system 145) .
[0036] A network node 110 and a UE 120 may each include one or multiple antennas or antenna arrays. Typical network nodes 110 and UEs 120 may include multiple antennas, which may be organized or structured into one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays, among other examples. As used herein, the term “antenna” can refer to one or more antennas, one or more antenna panels, one or more antenna groups, one or more sets of antenna elements, or one or more antenna arrays. The term “antenna panel” can refer to a group of antennas (such as antenna elements) arranged in an array or panel, which may facilitate beamforming by manipulating parameters associated with the group of antennas. The term “antenna module” may refer to circuitry including one or more antennas as well as one or more other components (such as filters, amplifiers, or processors) associated with integrating the antenna module into a wireless communication device, such as the network node 110 and the UE 120.
[0037] A network node 110 may be, may include, or also may be referred to as an NR network node, a 5G network node, a 6G network node, a Node B, a gNB, an access point (AP) , a transmission reception point (TRP) , a network entity, a network element, a network equipment, or another type of device, component, or system included in a radio access network (RAN) . In various deployments, a network node 110 may be implemented as a single physical node (for example, a single physical structure) or may be implemented as two or more physical nodes (for example, two or more distinct physical structures) . For example, a network node 110 may be a device or system that implements a part of a radio protocol stack, a device or system that implements a full radio protocol stack (such as a full gNB protocol stack) , or a collection of devices or systems that collectively implement the full radio protocol stack. For example, and as shown, a network node 110 may be an aggregated network node having an aggregated architecture, meaning that the network node 110 may implement a full radio protocol stack that is physically and logically integrated within a single physical structure in the wireless communication network 100. For example, an aggregated network node 110 may include a single standalone base station or a single TRP that operates with a full radio protocol stack to enable or facilitate communication between a UE 120 and a core network of the wireless communication network 100.
[0038] Alternatively, and as also shown, a network node 110 may be a disaggregated network node 110 (sometimes referred to as a disaggregated base station) , having a disaggregated architecture, meaning that the network node 110 may operate with a radio protocol stack that is physically distributed or logically distributed among two or more nodes in the same geographic location or in different geographic locations. In some deployments, disaggregated network nodes 110 may be used in an integrated access and backhaul (IAB) network, in an open radio access network (O-RAN) (such as a network configuration in compliance with the O-RAN Alliance) , or in a virtualized radio access network (vRAN) , also known as a cloud radio access network (C-RAN) , to facilitate scaling by separating network functionality into multiple units or modules that can be individually deployed.
[0039] The disaggregated network nodes 110 of the wireless communication network 100 may include one or more central units (CUs) , one or more distributed units (DUs) , and one or more radio units (RUs) . A CU may host one or more higher layers, such as an RRC layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer, among other examples. A DU may host one or more of a radio link control (RLC) layer, a MAC layer, or one or more higher physical (PHY) layers depending, at least in part, on a functional split, such as a functional split defined by the 3GPP. In some examples, a DU also may host a lower PHY layer that is configured to perform functions, such as a fast Fourier transform (FFT) , an inverse FFT (IFFT) , beamforming, or physical random access channel (PRACH) extraction and filtering, among other examples. An RU may perform RF processing functions or lower PHY layer functions, such as an FFT, an IFFT, beamforming, or PRACH extraction and filtering, among other examples, according to a functional split, such as a lower layer split (LLS) . In such an architecture, each RU can be operated to handle over the air (OTA) communication with one or more UEs 120. In some examples, a single network node 110 may include a combination of one or more CUs, one or more DUs, or one or more RUs. In some examples, a CU, a DU, or an RU may be implemented as a virtual unit, such as a virtual central unit (VCU) , a virtual distributed unit (VDU) , or a virtual radio unit (VRU) , among other examples, which may be implemented as a virtual network function, such as in a cloud deployment.
[0040] In some examples, the wireless communication network 100 may be a heterogeneous network that includes network nodes 110 of various types. Different types of network nodes 110 may generally operate on the same or different operating bands, transmit at different power levels, or serve different coverage areas, each of which may be referred to as or associated with a particular cell 130 (for example, a cell 130a and a cell 130b) .
[0041] The UEs 120 may be physically dispersed throughout the coverage area of the wireless communication network 100, and each UE 120 may be stationary or mobile. A UE 120 may be, may include, or also may be referred to as an access terminal, a mobile station, a client device, or a subscriber unit. A UE 120 may be, include, or be coupled with a cellular phone (for example, a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (for example, a smart watch, smart clothing, smart glasses, a smart wristband, or smart jewelry) , a gaming device, an entertainment device (for example, a music device, a video device, or a satellite radio) , an XR device, a vehicular component or sensor, a smart meter or sensor, industrial manufacturing equipment, a Global Navigation Satellite System (GNSS) device (such as a Global Positioning System device or another type of positioning device) , an artificially intelligent robot or other device implementing artificial intelligence, a UE function of a network node, or any other suitable device or function that may communicate in the wireless communication network 100.
[0042] Some UEs 120 may be classified according to different categories in association with different complexities or different capabilities. UEs 120 in a first category may be associated with relatively low complexity or cost such as NB-IoT devices or eMTC UEs. UEs 120 in a second category may include higher complexity or cost devices, such as mission-critical IoT devices, baseline UEs, high-tier UEs, advanced UEs, full-capability UEs, or premium UEs that are capable of URLLC, eMBB, or precise positioning in the wireless communication network 100. A third category of UEs 120 may have mid-tier complexity or capabilities (for example, capabilities between that of the UEs 120 of the first category and the UEs 120 of the second category) . A UE 120 of the third category may be referred to as a reduced capability UE ( “RedCap UE” ) , a mid-tier UE, an NR-Light UE, or an NR-Lite UE, among other examples.
[0043] In some examples, a network node 110 may be, may include, or may operate as an RU, a TRP, or a base station that communicates with one or more UEs 120 via a radio access link (which may be referred to as a “Uu” link) . The radio access link may include a downlink and an uplink. “Downlink” (or “DL” ) refers to a communication direction from a network node 110 to a UE 120, and “uplink” (or “UL” ) refers to a communication direction from a UE 120 to a network node 110. Downlink and uplink resources may include time domain resources (for example, frames, subframes, slots, and symbols) , frequency domain resources (for example, frequency bands, component carriers (CCs) , subcarriers, resource blocks, and resource elements) , and spatial domain resources (for example, particular transmit directions or beams) .
[0044] Frequency domain resources may be subdivided into bandwidth parts (BWPs) . A BWP may be a block of frequency domain resources (for example, a continuous set of resource blocks (RBs) within a full component carrier bandwidth) that may be configured at a UE-specific level. A UE 120 may be configured with both an uplink BWP and a downlink BWP (which may be the same or different) . Each BWP may be associated with its own numerology (indicating a sub-carrier spacing (SCS) and cyclic prefix (CP) ) . A BWP may be dynamically configured or activated (for example, by a network node 110 transmitting a downlink control information (DCI) configuration to the one or more UEs 120) or reconfigured (for example, in real-time or near-real-time) according to changing network conditions in the wireless communication network 100 or specific requirements of one or more UEs 120. An active BWP defines the operating bandwidth of the UE 120 within the operating bandwidth of the serving cell.
[0045] As used herein, a downlink signal may be or include a reference signal, control information, or data. For example, downlink reference signals include a primary synchronization signal (PSS) , a secondary SS (SSS) , an SSB (for example, that includes a PSS, an SSS, and a physical broadcast channel (PBCH) ) , a demodulation reference signal (DMRS) , a phase tracking reference signal (PTRS) , a tracking reference signal (TRS) , and a channel state information (CSI) reference signal (CSI-RS) , among other examples. A downlink signal carrying control information or data may be transmitted via a downlink channel. Downlink channels may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Downlink reference signals may be transmitted in addition to, or multiplexed with, downlink control channel communications or downlink data channel communications. A downlink control channel may be specifically used to transmit DCI from a network node 110 to a UE 120. DCI generally contains the information the UE 120 needs to identify RBs in a subsequent subframe and how to decode them, including a modulation and coding scheme (MCS) or redundancy version parameters. Different DCI formats carry different information, such as scheduling information in the form of downlink or uplink grants, slot format indicators (SFIs) , preemption indicators (PIs) , transmit power control (TPC) commands, hybrid automatic repeat request (HARQ) information, new data indicators (NDIs) , among other examples. A downlink data channel may be used to transmit downlink data (for example, user data associated with a UE 120) from a network node 110 to a UE 120. Downlink control channels may include physical downlink control channels (PDCCHs) , and downlink data channels may include physical downlink shared channels (PDSCHs) . Control information or data communications may be transmitted on a PDCCH and PDSCH, respectively. For example, a PDCCH can carry DCI, while a PDSCH can carry a MAC-CE, an RRC message, or user data, among other examples. Each PDSCH may carry one or more transport blocks (TBs) of data.
[0046] As used herein, an uplink signal may include a reference signal, control information, or data. For example, uplink reference signals include a sounding reference signal (SRS) , a PTRS, and a DMRS, among other examples. An uplink signal carrying control information or data may be transmitted via an uplink channel. An uplink channel may include one or more control channels for transmitting control information and one or more data channels for transmitting data. Uplink reference signals may be transmitted in addition to, or multiplexed with, uplink control channel communications or uplink data channel communications. An uplink control channel may be specifically used to transmit uplink control information (UCI) from a UE 120 to a network node 110. An uplink data channel may be used to transmit uplink data (for example, user data associated with a UE 120) from a UE 120 to a network node 110. Uplink control channels may include physical uplink control channels (PUCCHs) , and uplink data channels may include physical uplink shared channels (PUSCHs) . Control information or data communications may be transmitted on a PUCCH and PUSCH, respectively. For example, a PUCCH can carry UCI, while a PUSCH can carry a MAC-CE, an RRC message, or user data, among other examples. UCI can include a scheduling request (SR) , HARQ feedback information (for example, a HARQ acknowledgement (ACK) indication or a HARQ negative acknowledgement (NACK) indication) , uplink power control information (for example, an uplink TPC parameter) , or CSI, among other examples. CSI can include a channel quality indicator (CQI) (indicative of downlink channel conditions to facilitate selection of transmission parameters, such as an MCS, by a network node 110) , a precoding matrix indicator (PMI) , a CSI-RS resource indicator (CRI) (for example, indicative of a beam used to transmit a CSI-RS) , an SS / PBCH resource block indicator (SSBRI) (for example, indicative of a beam used to transmit an SSB) , a layer indicator (LI) , a rank indicator (RI) , or measurement information (for example, an L1-reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, among other examples) which can be used for beam management, among other examples. Each PUSCH may carry one or more TBs of data.
[0047] The information (for example, data, control information, or reference signal information) transmitted by a network node 110 to a UE 120, or vice versa, may be represented as a sequence of binary bits that are mapped (for example, modulated) to an analog signal waveform (for example, a discrete Fourier transform (DFT) -spread-orthogonal frequency division multiplexing (OFDM) (DFT-s-OFDM) waveform or a CP-OFDM waveform) that is transmitted by the network node 110 or UE 120 over a wireless communication channel. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively) may select an MCS (for example, an order of quadrature amplitude modulation (QAM) , such as 64-QAM, 128-QAM, or 256-QAM, among other examples) for a downlink signal or an uplink signal. For example, the network node 110 may select an MCS for a downlink signal in accordance with UCI received from the UE 120 or may transmit, to the UE 120, an indication of an MCS to be applied for an uplink signal.
[0048] A network node 110 or a UE 120 (such as by using the processing system 145 or the processing system 140, respectively, or one or more coupled modems) may perform signal processing on the information (such as filtering, amplification, modulation, digital-to-analog conversion, an IFFT operation, multiplexing, interleaving, mapping, or encoding, among other examples) to generate a processed signal in accordance with the selected MCS. In some examples, the network node 110 or the UE 120 (for example, using the processing system 145 or the processing system 140, respectively, or one or more coupled encoders or modems) may perform a channel coding operation or a forward error correction (FEC) operation to control errors in transmitted information. For example, the network node 110 or the UE 120 may perform an encoding operation to generate encoded information (such as by selectively introducing redundancy into the information, typically using an error correction code (ECC) , such as a polar code or a low-density parity-check (LDPC) code) . The network node 110 or the UE 120 (for example, using the processing system 145 or one or more modems) may further perform spatial processing (for example, precoding) on the encoded information to generate one or more processed or precoded signals for downlink or uplink transmission, respectively. In some examples, the network node 110a or the UE 120a may perform codebook-based precoding or non-codebook-based precoding. Codebook-based precoding may involve selecting a precoder (for example, a precoding matrix) using a codebook. For example, the network node 110a may provide precoding information indicating which precoder, defined by the codebook, is to be used by the UE 120a. Non-codebook-based precoding may involve selecting or deriving a precoder based on, or otherwise associated with, one or more downlink or uplink signal measurements. The network node 110a or the UE 120a may transmit the processed downlink or uplink signals, respectively, via one or more antennas.
[0049] The network node 110a or the UE 120a may receive uplink signals or downlink signals, respectively, via one or more antennas. The network node 110a or the UE 120a (for example, using the processing system 145 or the processing system 140, respectively, or one or more coupled modems) may perform signal processing (for example, in accordance with the MCS) on the received uplink or downlink signals, respectively (such as filtering, amplification, demodulation, analog-to-digital conversion, an FFT operation, demultiplexing, deinterleaving, de-mapping, equalization, interference cancellation, or decoding, among other examples) , to map the received signal (s) to a sequence of binary bits (for example, received information) that estimates the information transmitted by the network node 110 or the UE 120 via the downlink or uplink signals. The network node 110a or the UE 120a (for example, using the processing system 145 or the processing system 140, respectively, or a coupled decoder or one or more modems) may decode the received information (such as by using an ECC, a decoding operation, or an FEC operation) to detect errors or correct bit errors in the received information to generate decoded information. The decoded information may estimate the information transmitted via the downlink or uplink signals.
[0050] In some examples, a UE 120 and a network node 110 may perform MIMO communication. MIMO communication generally refers to transmitting or receiving multiple signals (such as multiple layers or multiple data streams) simultaneously over the same time and frequency resources. A network node 110 or a UE 120 may communicate using single-user MIMO or multi-user MIMO (MU-MIMO) , the latter of which being used by a network node 110 to simultaneously transmit signals to multiple UEs 120. MIMO techniques may involve spatial multiplexing (multi-layer transmission) or beamforming. To implement beamforming, the amplitudes or phases of signals transmitted via antenna elements may be modulated and shifted relative to each other (such as by manipulating a phase shift, a phase offset, or an amplitude) to generate one or more beams. For example, a network node 110 may generate one or more beams 160a, and a UE 120 may generate one or more beams 160b. The term “beam” may refer to a directional transmission of a wireless signal toward a receiving device or otherwise in a desired direction, a directional reception of a wireless signal from a transmitting device or otherwise in a desired direction, a direction associated with such a directional transmission or directional reception, a set of directional resources associated with a signal transmission or signal reception (for example, an angle of arrival, a horizontal direction, or a vertical direction) , or a set of parameters or resources associated with one or more aspects of a directional signal, among other examples.
[0051] In some examples, a network node 110 or a UE 120 may implement massive MIMO, which may be associated with an increased (for example, “massive” ) quantity of antennas at the network node 110 or at the UE 120, such as in a network implementing mmWave technology, which enables more precise beamforming or reduced interference. In some examples, the wireless communication network 100 may implement multi-TRP (mTRP) operation (including redundant transmission or reception on multiple TRPs) or non-coherent joint transmission (NC-JT) .
[0052] The network node 110 and the UE 120 may establish a communication link or beam pair, and otherwise increase reliability, throughput, signal strength, or other signal properties for MIMO communications, by performing beam management operations, such as an initial beam acquisition operation, a beam refinement operation, or a beam recovery operation. For example, an initial beam acquisition operation may involve the network node 110 transmitting signals (for example, SSBs or other signals) via respective beams (for example, of the beams 160 of the network node 110) and the UE 120 receiving and measuring the signal (s) via respective beams of multiple beams (for example, from the beams 160 of the UE 120) to identify a best beam (or beam pair) for communication between the UE 120 and the network node 110. A beam refinement operation may involve a first device (for example, the UE 120 or the network node 110) transmitting signal (s) via a subset of beams (for example, identified based on, or otherwise associated with, measurements reported as part of one or more other beam management operations) . A second device (for example, the network node 110 or the UE 120) may receive the signal (s) via a single beam (for example, to identify the best beam for communication from the subset of beams) . The beam (s) may be identified or defined via one or more spatial parameters, such as a transmission configuration indicator (TCI) state or a quasi co-location (QCL) parameter, among other examples.
[0053] Some aspects and techniques as described herein may be implemented, at least in part, using an artificial intelligence (AI) program (for example, referred to herein as an “AI / ML model” ) , such as a program that includes a machine learning (ML) model or an artificial neural network (ANN) model. The AI / ML model may be deployed at one or more devices 165 (for example, one or more network nodes 110, one or more UEs 120, one or more servers, or one or more components of a cloud computing network, among other examples) . For example, in a deployment in which AI / ML functionality is performed independently at a device 165, sometimes referred to as “overlay AI / ML, ” the AI / ML model (or an instance or portion of the AI / ML model) may be deployed at a UE 120 (for example, by the processing system 140) , a network node 110 (for example, by the processing system 145) , one or more servers, or one or more components of a cloud computing network, among other examples. Additionally, or alternatively, in a deployment where AI / ML functionality is coordinated between different devices 165, sometimes referred to as “coordinated AI / ML, ” or performed at all device and network layers, sometimes referred to as “native AI / ML, ” the AI / ML model (or an instance of the AI / ML model) may be deployed at multiple devices 165 (for example, a first portion of the AI / ML model may be deployed at a UE 120 and a second portion of the AI / ML model may be deployed at a network node 110) . In other examples of coordinated AI / ML or native AI / ML, a first AI / ML model may be deployed at a UE 120 and a second AI / ML model may be deployed at a network node 110. The AI / ML model (s) may be configured to enhance various aspects of the wireless communication network 100 (for example, to increase privacy, reliability, or efficient use of network bandwidth, or to reduce latency, among other examples) . For example, the AI / ML model (s) may be trained to identify patterns or relationships in data corresponding to the wireless communication network 100, a device, or an air interface, among other examples. The AI / ML model (s) may support operational decisions relating to one or more aspects associated with wireless communications devices, networks, or services.
[0054] Accordingly, in some examples, the AI / ML model (s) may enable AI-as-a-Service (for example, an end-to-end AI / ML service via a user plane) for use cases, such as a self-organizing network (SON) , minimization of drive test (MDT) , quality of experience (QoE) , positioning, sensing, predictive mobility, or traffic prediction, among other examples. In some examples, AI-as-a-Service use cases may include measurement collection reporting by a UE 120, device selection criteria (for example, according to a geographical area where measurements are to be collected or UE capabilities to be used to collected measurements) , or reporting configurations (for example, reporting parameters such as location, time, or sensor information, among other examples) . Additionally, or alternatively, the AI / ML model (s) may enable AI / ML procedures (for example, RAN-triggered service establishment, configuration, inferencing using UE-side or network-side models, performance monitoring or management, or capability signaling, among other examples) . Additionally, or alternatively, the AI / ML model (s) may enable RAN-based AI / ML services via one or more application program interfaces (APIs) or management interfaces for use cases, such as beam management, radio resource monitoring (RRM) relaxation, mobility prediction, load prediction, network energy savings, or coverage and capacity improvements, among other examples) .
[0055] NES or network energy efficiency measures are expected to have increased importance in wireless network operations for various reasons, such as climate change mitigation, environmental sustainability, or network cost reduction, among other examples. For example, although NR generally offers a significant energy efficiency improvement per gigabyte over previous generations (for example, LTE) , new NR use cases or the adoption of millimeter wave frequencies may require more network sites, more network antennas, larger bandwidths, or more frequency bands, among other examples which may lead to more efficient wireless networks that nonetheless have higher energy requirements or cause more emissions than previous wireless network generations. Furthermore, energy accounts for a significant proportion of the cost to operate a wireless network. For example, according to some estimates, energy costs are about one-fourth the total cost to operate a wireless network, and over 90%of network operating costs are spent on energy (for example, fuel and electricity) . The largest proportion of energy consumption or energy costs are associated with a RAN, which accounts for about half of the energy consumption in a wireless network, with data centers and fiber transport accounting for smaller shares. Accordingly, measures to increase network energy savings or improve network energy efficiency are factors that may drive adoption or expansion of wireless networks.
[0056] In some examples, a UE 120 or network node 110 may implement power saving features (also referred to as energy saving features) . Power saving features may include, for example, relaxed radio resource monitoring (such as relaxed reference signal monitoring for devices operating in low mobility or in good radio conditions) , discontinuous transmission (DTX) / discontinuous reception (DRX) operation, reduced PDCCH monitoring during DRX active times, on-demand system information transmission, OD-SSB transmission, antenna port adaptation, advanced channel state information (CSI) reporting, or power-efficient paging reception.
[0057] In some examples, a UE 120 may operate in association with a DRX configuration (for example, indicated to the UE 120 by a network node 110) . DRX operation may enable the UE 120 to enter a sleep mode or state at various times while in the coverage area of a network node 110 to reduce power consumption for conserving battery resources, among other examples. The DRX configuration generally configures the UE 120 to operate in association with a DRX cycle. The UE 120 may repeat DRX cycles with a configured periodicity according to the DRX configuration. A DRX cycle may include a DRX on duration during which the UE 120 is in an awake mode or in an active state. A DRX cycle may also include one or more durations during which the UE 120 may operate in an inactive state. The one or more durations in which the UE 120 may operate in an inactive state may be opportunities for the UE 120 to enter a DRX sleep mode in which the UE 120 may refrain from monitoring for communications from a network node 110. Additionally or alternatively, the UE 120 may deactivate one or more antennas, RF chains, or other hardware components or devices while operating in the DRX sleep mode.
[0058] The time during which the UE 120 is configured to be in an active state during a DRX on duration may be referred to as an active time, and the time during which the UE 120 is configured to be in an inactive state, such as during a DRX sleep duration, may be referred to as an inactive time. During a DRX on duration, the UE 120 may monitor for downlink communications from one or more network nodes 110. If the UE 120 does not detect or does not successfully decode any downlink communications during the DRX on duration, the UE 120 may enter a DRX sleep mode for the inactive time duration at the end of the DRX on duration. If the UE 120 detects or successfully decodes a downlink communication during the DRX on duration, the UE 120 may remain in the active state for the duration of a DRX inactivity timer (which may extend the active time) . The UE 120 may start the DRX inactivity timer at a time at which the downlink communication is received. The UE 120 may remain in the active state until the DRX inactivity timer expires, at which time the UE 120 may transition to the sleep mode for an inactive time duration. Additionally or alternatively, the UE 120 may use a DRX cycle referred to as an extended DRX (eDRX) cycle, such as for use cases that are tolerant to latency. An eDRX cycle may include a relatively longer inactive time relative to a baseline DRX cycle (for example, an eDRX cycle may have a lower ratio of active time to inactive time) .
[0059] In some aspects, the UE 120 may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may receive configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; receive the DCI message; identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on of the configuration information and the SSB burst periodicity adaptation information; and measure SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity. Additionally, or alternatively, the communication manager 150 may perform one or more other operations described herein.
[0060] In some aspects, the network node 110 may include a communication manager 155. As described in more detail elsewhere herein, the communication manager 155 may transmit, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; and transmit, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information. Additionally, or alternatively, the communication manager 155 may perform one or more other operations described herein.
[0061] Fig. 2 is a diagram illustrating an example disaggregated network node architecture 200. One or more components of the example disaggregated network node architecture 200 may be, may include, or may be included in one or more network nodes (such one or more network nodes 110) . The disaggregated network node architecture 200 may include a CU 210 that can communicate directly with a core network 220 via a backhaul link, or that can communicate indirectly with the core network 220 via one or more disaggregated control units, such as a non-real-time (Non-RT) RAN intelligent controller (RIC) 250 associated with a Service Management and Orchestration (SMO) Framework 260 or a near-real-time (Near-RT) RIC 270 (for example, via an E2 link) . The CU 210 may communicate with one or more DUs 230 via respective midhaul links, such as via F1 interfaces. Each of the DUs 230 may communicate with one or more RUs 240 via respective fronthaul links. Each of the RUs 240 may communicate with one or more UEs 120 via respective RF access links. In some deployments, a UE 120 may be simultaneously served by multiple RUs 240.
[0062] Each of the components of the disaggregated network node architecture 200, including the CUs 210, the DUs 230, the RUs 240, the Near-RT RICs 270, the Non-RT RICs 250, and the SMO Framework 260, may include one or more interfaces or may be coupled with one or more interfaces for transmitting or receiving signals, such as data, control information, or reference signals via a wired or wireless transmission medium.
[0063] In some aspects, the CU 210 may be logically split into one or more CU user plane (CU-UP) units and one or more CU control plane (CU-CP) units. A CU-UP unit may communicate bidirectionally with a CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CU 210 may be deployed to communicate with one or more DUs 230, as necessary, for network control and signaling. Each DU 230 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 240. For example, a DU 230 may host various layers, such as an RLC layer, a MAC layer, or one or more PHY layers, such as one or more high PHY layers or one or more low PHY layers. Each layer (which also may be referred to as a module) may be implemented with an interface for communicating signals with other layers (and modules) hosted by the DU 230, or for communicating signals with the control functions hosted by the CU 210. Each RU 240 may implement lower layer functionality. In some aspects, real-time and non-real-time aspects of control and user plane communication with the RU (s) 240 may be controlled by the corresponding DU 230.
[0064] The SMO Framework 260 may support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 260 may support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operations and maintenance interface, such as an O1 interface. For virtualized network elements, the SMO Framework 260 may interact with a cloud computing platform (such as an open cloud (O-Cloud) platform 290) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface, such as an O2 interface. A virtualized network element may include, but is not limited to, a CU 210, a DU 230, an RU 240, a non-RT RIC 250, or a Near-RT RIC 270. In some aspects, the SMO Framework 260 may communicate with a hardware aspect of a 4G RAN, a 5G NR RAN, or a 6G RAN, such as an open eNB (O-eNB) 280, via an O1 interface. Additionally, or alternatively, the SMO Framework 260 may communicate directly with each of one or more RUs 240 via a respective O1 interface. In some deployments, this configuration can enable each DU 230 and the CU 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
[0065] The Non-RT RIC 250 may include or may implement a logical function that enables non-real-time control and optimization of RAN elements and resources, AI / ML workflows including model training and updates, or policy-based guidance of applications or features in the Near-RT RIC 270. The Non-RT RIC 250 may be coupled to or may communicate with (such as via an A1 interface) the Near-RT RIC 270. The Near-RT RIC 270 may include or may implement a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions via an interface (such as via an E2 interface) connecting one or more CUs 210, one or more DUs 230, or an O-eNB 280 with the Near-RT RIC 270.
[0066] In some aspects, to generate AI / ML models to be deployed in the Near-RT RIC 270, the Non-RT RIC 250 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 270 and may be received at the SMO Framework 260 or the Non-RT RIC 250 from non-network data sources or from network functions. In some examples, the Non-RT RIC 250 or the Near-RT RIC 270 may tune RAN behavior or performance. For example, the Non-RT RIC 250 may measure long-term trends and patterns for performance and may employ AI / ML models to perform corrective actions via the SMO Framework 260 (such as reconfiguration via an O1 interface) or via creation of RAN management policies (such as A1 interface policies) .
[0067] The network node 110, the processing system 145 of the network node 110, the UE 120, the processing system 140 of the UE 120, the CU 210, the DU 230, the RU 240, or any other component (s) of Fig. 1 or Fig. 2 may implement one or more techniques or perform one or more operations associated with an SSB burst periodicity adaptation indicator, as described in more detail elsewhere herein. For example, the processing system 145 of the network node 110, the processing system 140 of the UE 120, the CU 210, the DU 230, or the RU 240 may perform or direct operations of, for example, process 600 of Fig. 6, process 700 of Fig. 7, or other processes as described herein (alone or in conjunction with one or more other processors) . Memory of the network node 110 may store data and program code (or instructions) for the network node 110, the CU 210, the DU 230, or the RU 240. In some examples, the memory of the network node 110 may store data relating to a UE 120, such as RRC state information or a UE context. Memory of a UE 120 may store data and program code (or instructions) for the UE 120, such as context information. In some examples, the memory of the UE 120 or the memory of the network node 110 may include a non-transitory computer-readable medium storing a set of instructions for wireless communication. For example, the set of instructions, when executed by one or more processors (for example, of the processing system 145 or the processing system 140) of the network node 110, the UE 120, the CU 210, the DU 230, or the RU 240, may cause the one or more processors to perform process 600 of Fig. 6, process 700 of Fig. 7, or other processes as described herein. In some examples, executing instructions may include running the instructions, converting the instructions, compiling the instructions, or interpreting the instructions, among other examples.
[0068] In some aspects, the UE 120 includes means for receiving configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE 120; means for receiving the DCI message; means for identifying an applicable SSB burst periodicity for the secondary serving cell based at least in part on at the configuration information and the SSB burst periodicity adaptation information; or means for measuring SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity. The means for the UE 120 to perform operations described herein may include, for example, one or more of communication manager 150, processing system 140, a radio, one or more RF chains, one or more transceivers, one or more antennas, one or more modems, a reception component (for example, reception component 802 depicted and described in connection with Fig. 8) , or a transmission component (for example, transmission component 804 depicted and described in connection with Fig. 8) , among other examples.
[0069] In some aspects, the network node 110 includes means for transmitting, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; or means for transmitting, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information. The means for the network node 110 to perform operations described herein may include, for example, one or more of communication manager 155, processing system 145, a radio, one or more RF chains, one or more transceivers, one or more antennas, one or more modems, a reception component (for example, reception component 902 depicted and described in connection with Fig. 9) , or a transmission component (for example, transmission component 904 depicted and described in connection with Fig. 9) , among other examples.
[0070] Fig. 3 is a diagram illustrating an example 300 of an SSB hierarchy. As shown in Fig. 3, the SSB hierarchy may include an SSB burst set 305, which may include multiple SSB bursts 310, shown as SSB burst 0 through SSB burst N-1, where N is a maximum number of repetitions of the SSB burst 310 that may be transmitted by one or more network nodes. As further shown, each SSB burst 310 may include one or more SSBs 315, shown as SSB 0 through SSB M-1, where M is a maximum number of SSBs 315 that can be carried by an SSB burst 310. In some aspects, different SSBs 315 may be beam-formed differently (e.g., transmitted using different beams) , and may be used for cell search, cell acquisition, beam management, or beam selection (e.g., as part of an initial network access procedure) . An SSB burst set 305 may be periodically transmitted by a wireless node (e.g., a network node 110) , such as every X milliseconds, as shown in Fig. 3. In some aspects, an SSB burst set 305 may have a fixed or dynamic length, shown as Y milliseconds in Fig. 3. In some cases, an SSB burst set 305 or an SSB burst 310 may be referred to as a discovery reference signal (DRS) transmission window or an SSB measurement time configuration (SMTC) window.
[0071] In some aspects, an SSB 315 may include resources that carry a PSS 320, an SSS 325, or a PBCH 330. In some aspects, multiple SSBs 315 are included in an SSB burst 310 (e.g., with transmission on different beams) , and the PSS 320, the SSS 325, or the PBCH 330 may be the same across each SSB 315 of the SSB burst 310. In some aspects, a single SSB 315 may be included in an SSB burst 310. In some aspects, the SSB 315 may be at least four symbols (e.g., OFDM symbols) in length, where each symbol carries one or more of the PSS 320 (e.g., occupying one symbol) , the SSS 325 (e.g., occupying one symbol) , or the PBCH 330 (e.g., occupying two symbols) . In some aspects, an SSB 315 may be referred to as an SS / PBCH block.
[0072] In some aspects, the symbols of an SSB 315 are consecutive, as shown in Fig. 3. In some aspects, the symbols of an SSB 315 are non-consecutive. Similarly, in some aspects, one or more SSBs 315 of the SSB burst 310 may be transmitted in consecutive radio resources (e.g., consecutive symbols) during one or more slots. Additionally, or alternatively, one or more SSBs 315 of the SSB burst 310 may be transmitted in non-consecutive radio resources.
[0073] In some aspects, the SSB bursts 310 may have a burst period, and the SSBs 315 of the SSB burst 310 may be transmitted by a wireless node (e.g., a network node 110) according to the burst period. In this case, the SSBs 315 may be repeated during each SSB burst 310. In some aspects, the SSB burst set 305 may have a burst set periodicity, whereby the SSB bursts 310 of the SSB burst set 305 are transmitted by the wireless node according to the fixed burst set periodicity. In other words, the SSB bursts 310 may be repeated during each SSB burst set 305.
[0074] In some aspects, an SSB 315 may include an SSB index, which may correspond to a beam used to carry the SSB 315. A UE 120 may monitor for or measure SSBs 315 using different receive (Rx) beams during an initial network access procedure or a cell search procedure, among other examples. Based at least in part on the monitoring or measuring, the UE 120 may indicate one or more SSBs 315 with a best signal parameter (e.g., an RSRP parameter) to a network node 110 (e.g., directly or via one or more other network nodes) . The network node 110 and the UE 120 may use the one or more indicated SSBs 315 to select one or more beams to be used for communication between the network node 110 and the UE 120 (e.g., for a random access channel (RACH) procedure) . Additionally, or alternatively, the UE 120 may use the SSB 315 or the SSB index to determine a cell timing for a cell via which the SSB 315 is received (e.g., a serving cell) .
[0075] As indicated above, Fig. 3 is provided as an example. Other examples may differ from what is described with regard to Fig. 3.
[0076] Figs. 4A-4E are examples associated with SSB bursts in a secondary serving cell. In some examples, a UE may support OD-SSB burst transmissions in a secondary serving cell or adaptation of SSB burst periodicity for a secondary serving cell, such as in examples in which the UE is in a connected mode configured with CA (e.g., intra-band CA or inter-band CA) .
[0077] Figs. 4A-4D show examples associated with OD-SSB burst transmissions in a secondary serving cell. In some examples, there may be at least two cases associated with how AO-SSB bursts are transmitted in a cell supporting OD-SSB burst operation. In a first case, which is sometimes referred to as “Case 1, ” and which is shown by example 400 in Fig. 4A, for a cell supporting OD-SSB burst operation, there is no AO-SSB burst transmission in the cell. In such examples, the UE may only measures OD-SSB bursts in the cell (e.g., the SCell) when triggered to do so. More particularly, as indicated by reference number 401, the UE may receive (e.g., via a primary cell (PCell) or a primary secondary cell (PSCell) ) a MAC-CE indicating an OD-SSB burst transmission with a first periodicity (shown as P1 in Fig. 4A) for a deactivated SCell. Details of a MAC-CE that may be used to indicate an OD-SSB burst transmission are described below in connection with Fig. 4D. Accordingly, the UE may measure OD-SSB bursts in the deactivated SCell using the first periodicity (shown using hatching in Fig. 4A) . As indicated by reference number 402, the UE may thereafter receive an SCell activation command (e.g., via RRC signaling or a MAC-CE in the PCell or PSCell, among other examples, which is described in more detail below) .
[0078] In some examples, a periodicity of the OD-SSB bursts may be changed in connection with SCell activation, such as for a purpose of increasing OD-SSB burst transmissions when the SCell is to be activated. Accordingly, as indicated by reference number 403, the UE may receive a MAC-CE (e.g., via the PCell or PSCell) indicating an OD-SSB burst transmission with a second periodicity (shown as P2 in Fig. 4A) , with the second periodicity being less than the first periodicity (e.g., P2 < P1) . In this regard, during a transition period (e.g., a period of time after receiving the SCell activation command and prior to the SCell being activated) , the UE may measure OD-SSB bursts in the SCell using the second periodicity (shown using stippling in Fig. 4A) . As indicated by reference number 404, once the SCell activation is complete, the UE may, in this case, continue to measure OD-SSB bursts in the SCell using the second periodicity (e.g., P2) . As indicated by reference number 405, the UE may thereafter receive an SCell deactivation command (e.g., via the PCell or PSCell) , and, as indicated by reference number 406, the OD-SSB burst transmissions may be terminated. Accordingly, the UE may cease to measure OD-SSB bursts in the deactivated SCell, until a time at which the UE receives a subsequent MAC-CE (not shown in Fig. 4A) indicating resumption of OD-SSB burst transmission (e.g., resumption of OD-SSB burst transmission with the first periodicity, among other examples) .
[0079] In a second case, which is sometimes referred to as “Case 2, ” and which is shown by example 410 in Fig. 4B, a cell supporting OD-SSB burst operation may also be associated with AO-SSB burst transmissions. In this regard, when the SCell is deactivated, the network node may transmit, and the UE may measure, the AO-SSB bursts (shown using black shading in Fig. 4B) based at least in part on a configured periodicity for the AO-SSB burst transmissions (e.g., a periodicity indicated by RRC signaling) . As indicated by reference number 411, the UE may thereafter receive an SCell activation command (e.g., via the PCell or PSCell) , which may be substantially similar to the SCell activation command described above in connection with reference number 402.
[0080] Additionally, or alternatively, as indicated by reference number 412, the UE may receive a MAC-CE (e.g., via the PCell or PSCell) indicating an OD-SSB burst transmission with a periodicity of P1. Accordingly, during the transition period, the UE may measure the AO-SSB bursts using the configured periodicity and the OD-SSB bursts (shown using stippling in Fig. 4B) in the SCell using the periodicity indicated by the MAC-CE (e.g., P1) . As described in more detail below, and as indicated by reference number 413, certain instances of the OD-SSB bursts may overlap, in the time or frequency domain, with the AO-SSB bursts. As indicated by reference number 414, once the SCell activation is complete, the UE may, in this case, continue to measure the AO-SSB bursts using the configured periodicity and the OD-SSB bursts using the periodicity indicated by the MAC-CE (e.g., P1) . In some other examples (not shown in Fig. 4B) , the network node may cease transmission of the OD-SSB bursts once the SCell activation is complete, and thus, following SCell activation completion, the UE may measure only the AO-SSB bursts. As indicated by reference number 415, the UE may thereafter receive an SCell deactivation command (e.g., via the PCell or PSCell) , which may be substantially similar to the SCell deactivation command described above in connection with reference number 405. Accordingly, as indicated by reference number 416, the OD-SSB burst transmission may be terminated, and the UE may cease to measure OD-SSB bursts in the deactivated cell (e.g., the UE may only measure AO-SSB bursts in the deactivated cell) until the UE receives a subsequent MAC-CE (not shown in Fig. 4B) indicating resumption of OD-SSB burst transmission (e.g., resumption of OD-SSB burst transmission with the first periodicity, among other examples) .
[0081] In some examples, the time domain positions of OD-SSB bursts may be configured by a network node. Moreover, the location (s) (e.g., system frame number (SFN) offset, half-frame index, or similar parameters) in the time domain of candidate OD-SSB bursts or SSB positions within the candidate OD-SSB bursts may be configured by the network node. For example, for a cell supporting OD-SSB burst operation, a UE may be configurated with the time domain locations of OD-SSB bursts per OD-SSB burst periodicity by RRC for both Case 1 and Case 2, as described above. For example, the configuration may be based at least in part on two parameters, where a first parameter is used to indicate an SFN offset from a reference point and the second parameter is to indicate a half frame index. In such examples, the reference point may be an SFN which satisfies the expression (SFN index × 10) modulo (OD-SSB periodicity) = 0. Moreover, in examples in which the SFN offset parameter is not configured, the UE may assume that the SFN offset is set to 0. Additionally, or alternatively, in examples in which the half frame index parameter is not configured, a UE may assume that the half frame index set to 0. In some examples, a value range of the SFN offset may be 0 to 15, among other examples. Moreover, a value range of the half frame index may be 0 or 1.
[0082] As described above, in examples in which a cell includes both AO-SSB burst transmissions and OD-SSB burst transmissions (e.g., Case 2, described above) , an AO-SSB burst may at least partially overlap, in the time or frequency domain, with an instance of the OD-SSB burst. For example, in instances in which center-frequency locations of the AO-SSB bursts and the OD-SSB bursts are the same, if the union of an AO-SSB burst transmission and an OD-SSB burst transmission has a periodic time domain pattern of 5 ms periodicity, a half-frame index may be different for the AO-SSB burst and the OD-SSB burst. Additionally, or alternatively, if the union of the AO-SSB burst transmission and the OD-SSB burst transmission has a periodic time domain pattern of periodicity larger than 5 ms (e.g., 10 ms, 20 ms, 40 ms, 80 ms, or 160 ms, among other examples) , the half-frame index may the same for the AO-SSB burst and the OD-SSB burst. Additionally, or alternatively, a PBCH payload for the same SSB index (other than SFN index or half frame index) may be the same for the AO-SSB burst and the OD-SSB burst.
[0083] In some examples, as shown in Fig. 4C, and by example 420, in examples in which the frequency locations of the AO-SSB burst (shown in Fig. 4C using dark stippling) and the OD-SSB burst (shown in Fig. 4C using light stippling) are the same, the time domain locations of the instances of the AO-SSB burst may be a subset of the time domain locations of the instances of the OD-SSB bursts. More particularly, as shown in Fig. 4C, the AO-SSB burst and the OD-SSB bursts may include up to four SSBs (indexed as SSB0 through SSB3 in Fig. 4C) and the AO-SSB burst and the OD-SSB bursts may have a same center frequency location but different periodicities, with the time domain locations of the AO-SSB bursts being a subset of the time domain locations of the OD-SSB bursts (e.g., the AO-SSB bursts have a periodicity of P0, such as 40 ms in this example, and the OD-SSB bursts may have a periodicity of P1 < P0, such as 20 ms in this example) . In such examples, at a first time domain location (as indicated by reference number 421) , the AO-SSB burst and the OD-SSB burst fully overlap. Moreover, at a second time domain location (as indicated by reference number 422) , an OD-SSB burst does not overlap with an AO-SSB burst. This pattern may generally repeat for as long as the OD-SSB burst is activated (e.g., until an SCell deactivation command is received, among other examples) , such that, at a third time domain location (as indicated by reference number 423) , the AO-SSB burst and the OD-SSB burst fully overlap; at a fourth time domain location (as indicated by reference number 424) , the OD-SSB burst does not overlap with an AO-SSB burst; and so forth.
[0084] In some examples, when or how a network node triggers an OD-SSB burst transmission may be transparent to a UE; however, the UE may be informed regarding when to expect OD-SSB burst transmission from the cell (e.g., the SCell) . As described above, in some examples the network node may indicate, to the UE, that the OD-SSB burst transmission is to commence using a MAC-CE. In some other examples, the network node may indicate that the OD-SSB burst transmission is to commence using other signaling, such as RRC signaling. Put another way, the network node and the UE may support both RRC and MAC-CE based signaling for an indication of OD-SSB burst transmission in a cell supporting OD-SSB SCell operation.
[0085] In some examples, a network node may be capable of sending an indication of OD-SSB burst transmission in various scenarios, sometimes referred to as “Scenario 2, ” “Scenario 2A, ” “Scenario 3A, ” and “Scenario 3B. ” Scenario 2 is a scenario in which an SCell is configured for a UE but the UE has not yet received an SCell activation command. Scenario 2A is a scenario in which the UE has received an SCell activation command. Scenario 3A is a scenario after the UE receives the SCell activation command and prior to a time at which SCell activation is complete. Scenario 3B is a scenario when / after SCell activation is complete and thus the SCell is activated. In such examples, a network node may be capable of sending an indication of an OD-SSB burst transmission in at least Scenario 2 (Case 1 or 2) or Scenario 2A (Case 1 or 2) , among other examples.
[0086] As shown in Fig. 4D, and by example 430, in some examples the network node may indicate an OD-SSB burst transmission using a MAC-CE. In such examples, the UE may expect that the OD-SSB bursts are to be transmitted no sooner than a certain time instance, sometimes referred to as “time instance A. ” In some examples, time instance A is a beginning of the first slot containing the first actually transmitted SSB index within the first candidate OD-SSB burst which is at least T slots after a slot where the UE receives signaling from network node to indicate the OD-SSB burst transmission (e.g., the slot in which the UE receives the MAC-CE indicating the OD-SSB burst transmission) . More particularly, as shown in Fig. 4D, and by reference number 431, the UE may receive (e.g., via a PCell or PSCell or another secondary serving cell) an OD-SSB burst transmission indication (e.g., a MAC-CE) in a certain slot, sometimes referred to herein as slot #n. As indicated by reference number 432, if the MAC-CE is safely received, the UE may acknowledge reception of the MAC-CE, such as by transmitting a HARQ-ACK message in the PCell or PSCell using a PUCCH in a slot that is a certain offset (e.g., m slots) from the slot in which the MAC-CE was received, sometimes referred to herein as slot # (n + m) .
[0087] In such instances, the UE may expect that the OD-SSB bursts are to be transmitted no sooner than a beginning of the first slot containing the first actually-transmitted SSB index within the first candidate OD-SSB burst which is at least T slots after slot #n. More particularly, as indicated by reference number 433, a first candidate OD-SSB burst in the SCell may occur prior to reception of the MAC-CE in slot #n, and thus the UE may not expect to receive any SSBs in the first candidate OD-SSB burst, and thus may not measure SSBs in the first OD-SSB burst. However, as indicated by reference number 434, a second candidate OD-SSB burst may occur a certain time period after the first candidate OD-SSB burst, shown as OD-SSB burst periodicity 435, which may be an RRC-configured value (as described in more detail below) . In such examples, because a beginning of a slot containing the first actually transmitted SSB index (which, in this example, may be SSB2, as shown in connection with the second candidate OD-SSB burst) occurs at least T slots (indicated by reference number 436) after slot #n, the UE expects that one or more SSBs (in this example, SSB2 and SSB3) will be transmitted in the second candidate OD-SSB burst. Put another way, the UE may expect that one or more SSBs (in this example, SSB2 and SSB3) will be transmitted in the second candidate OD-SSB burst because time instance A occurs in the second candidate OD-SSB burst. Accordingly, the UE may measure the second candidate OD-SSB burst for transmitted SSBs.
[0088] In some examples, a value of T may be no less than a timeline required for the UE to process a MAC-CE associated with the SCell activation. Additionally, or alternatively, in some examples, and as shown in connection with reference number 436, the value of T may be no less than T_min, which is equal to where slot # (n + m) is a slot indicated for PUCCH transmission with HARQ-ACK information when the UE receives MAC-CE signaling to indicate OD-SSB burst transmission ending in slot #n, and where is a number of slots within a subframe for a given numerology, μ. In some other examples, the network node may indicate an OD-SSB burst transmission using RRC signaling (not shown) . In such examples, the UE may expect an OD-SSB burst transmission from a first candidate OD-SSB burst after receiving an RRC message carrying the indication of the OD-SSB transmission.
[0089] In some examples, and as described above in connection with reference numbers 406 and 416, OD-SSB burst transmission may be deactivated. Put another way, in some examples, for a cell supporting OD-SSB SCell operation, deactivation of the OD-SSB burst transmission may be supported. In such examples, in order to deactivate OD-SSB burst transmission, a UE may support an explicit indication of deactivation for OD-SSB burst transmission via one of a MAC-CE or RRC signaling (e.g., received via the PCell or PSCell or another secondary serving cell) . In some other examples, a UE may be configured with a number (sometimes referred to as N) of OD-SSB bursts to be transmitted after OD-SSB burst transmission is indicated. Additionally, or alternatively, in some other examples, a UE may be configured or indicated with a duration of an OD-SSB burst transmission window (e.g., a time period during which OD-SSB bursts are to be received) . In some other examples, OD-SSB burst transmission (if activated) may be automatically deactivated when a UE receives an SCell deactivation MAC-CE for the activated SCell (e.g., via the PCell or PSCell or another secondary serving cell) . Additionally, or alternatively, in some examples, OD-SSB burst transmission (if activated) may be deactivated based at least in part on a timer for SCell deactivation expiring. In some other examples, OD-SSB burst transmission (if activated) may be deactivated when an SCell activation is completed. Moreover, in some examples, OD-SSB burst transmission may be deactivated based at least in part on reception of an explicit indication of deactivation for OD-SSB burst transmission via a group-common DCI message (e.g., via the PCell or PSCell or another serving cell) , among other examples.
[0090] In some examples, it may be desirable to adapt SSB burst periodicity (e.g., SS / PBCH burst periodicity, such as P1 or P2 described above in connection with Figs. 4A and 4B, the OD-SSB burst periodicity 435 described above in connection with Fig. 4D, or an additional SSB burst periodicity configured for a UE, among other examples) in the time domain, such as for a purpose of adapting the SSB burst periodicity according to channel conditions, SCell status, NES considerations, or similar factors. For example, Fig. 4E shows examples associated with adapting SSB burst periodicity in the time domain. In some examples, a UE may be configured with a default SSB burst periodicity (e.g., P1 in Fig. 4E, shown as 40 ms in this example but which may be different in other examples) for a serving cell (e.g., a secondary serving cell) and one or more additional SSB burst periodicities (e.g., P2 in Fig. 4E, shown as 20 ms in this example but which may be different in other examples) for the serving cell. As shown by example 440, the serving cell may initially transmit, and the UE may initially measure, SSB bursts in the serving cell using the default periodicity (e.g., P1) . That is, the serving cell may transmit, and the UE may measure, SSB bursts using the first periodicity (as indicated by reference number 445 and by using dark stippling) , and the serving cell may refrain from transmitting, and the UE may refrain from measuring, SSBs according to the additional SSB burst periodicity (as indicated by reference number 450 and by using light stippling) . However, as shown by example 455, the UE may thereafter receive a DCI message 460 (e.g., a DCI format 2_9 message, described in more detail below) in a first serving cell, such as within slot m of the first serving cell, indicating that an SSB burst periodicity for SSB transmissions in a second serving cell is to be adapted (where the first and second serving cells may be the same serving cell or different serving cells) . For example, the DCI message 460 may indicate that the UE is to begin measuring SSBs according to the additional SSB burst periodicity (e.g., 20 ms in this example) . Accordingly, after a certain time period, T, has elapsed following reception of the DCI message 460, the serving cell may transmit, and the UE may monitor, SSBs using the additional SSB burst periodicity (e.g., P2) .
[0091] In some examples, T may be equal to m + d + Δ, where m is the index of the slot in which the DCI message 460 is received in the first serving cell, d is a number of slots for the SCS of the downlink BWP of the first serving cell as defined by a relevant wireless communication standard (such as by table 11.5-1 of 3GPP Technical Specification (TS) 38.213) , and Δ is a number of slots for the SCS of the downlink BWP of the first serving cell that is a fixed value defined by a wireless communication standard (e.g., 3GPP) or that is subject to UE capability that is signaled per UE or per bane or per band combination, among other examples. In such examples, d may be equal to 3 slots for a downlink BWP SCS of 15 kHz, 6 slots for a downlink BWP SCS of 30 kHz, 12 slots for a downlink BWP SCS of 60 kHz, 24 slots for a downlink BWP SCS of 120 kHz, 96 slots for a downlink BWP SCS of 480 kHz, or 192 slots for a downlink BWP SCS of 960 kHz, among other examples.
[0092] Put another way, when a UE receives in slot m on the active DL BWP of a first serving cell a PDCCH providing DCI format 2_9 that indicates a change in SS / PBCH burst periodicity of the SSB transmission on a secondary serving cell, the UE operates on the secondary serving cell according to the indicated SS / PBCH burst periodicity starting from the first slot on the active DL BWP that does not begin before the beginning of the slot m + d + Δ on the active DL BWP of the first serving cell, where d is a number of slots for the SCS of the active DL BWP of the first serving cell in Table 11.5-1 of TS 38.213 and Δ is a number of slots for the SCS of the active DL BWP of the first serving cell (e.g., which may be fixed in a specification or subject to an UE capability that is signaled per UE or per band or per band combination) . Or, put even another way, when a UE receives in slot m on the active DL BWP of a serving cell a PDCCH providing DCI format 2_9 that indicates a change in SS / PBCH burst periodicity of the SS / PBCH transmission on the serving cell, the UE assumes SS / PBCH is transmitted on the secondary serving cell according to the indicated SS / PBCH burst periodicity from the beginning of the first slot containing the first actually transmitted SSB index within the first SSB burst or the first candidate SSB index within the first SSB burst that does not begin before the beginning of the slot m + d + Δ of the first serving cell, where d is a number of slots for the SCS of the active DL BWP of the first serving cell in Table 11.5-1 of TS 38.213 and Δ is a number of slots for the SCS of the active DL BWP of the first serving cell (e.g., which may be fixed in a specification or subject to an UE capability that is signaled per UE or per band or per band combination) .
[0093] However, adaptation of SSB burst periodicities in the time domain may require coordination between a network node and a UE, such as for a purpose of ensuring proper synchronization and system functionality. Accordingly, there remains a need for mechanisms to configure and signal SSB burst periodicity adaptation in serving cells, such as signaling mechanisms to indicate SSB burst periodicity adaptation in a manner that supports NES while maintaining synchronization and measurement accuracy for connected mode UEs. Put another way, there remains a need for mechanisms to support the signaling or SSB burst adaptation operations described above in connection with Fig. 4E.
[0094] Some techniques and aspects described herein generally relate to improving energy efficiency in wireless communication systems by adapting SSB burst periodicity for SCells configured with CA. In some aspects, a UE may receive configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for an associated secondary serving cell. The UE may thus receive the DCI message, may identify an applicable SSB burst periodicity for the secondary serving cell based on the configuration information or the SSB burst periodicity adaptation information, and may measure SSBs in the secondary serving cell according to the identified SSB burst periodicity. In some aspects, the UE may also receive configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell. In such aspects, the size of the set of candidate SSB burst periodicities may be fixed according to a predefined rule, indicated by a common configuration applicable to all SCells, or indicated by a dedicated configuration specific to the SCell for which the SSB burst periodicity is to be adapted.
[0095] As a result, the described techniques may be used to adapt SSB burst periodicity in a manner that supports NES by reducing unnecessary SSB transmissions. This efficient utilization of the transmission power resources corresponds to a more sustainable network operation and leads to the conservation of energy resources. In some aspects, the dynamic adjustment of the SSB burst periodicity may align the network’s operations with the actual requirements of the UEs and the prevailing network conditions, which may conserve processing resources and network resources as less frequent transmissions are required when conditions permit. For example, by monitoring factors such as UE activity, mobility patterns, and traffic load, the network may dynamically adjust the frequency of SSB transmissions to ensure that synchronization and measurement opportunities are provided only as needed. This adaptive approach enables the network to minimize unnecessary signaling, thereby conserving energy and processing resources, while maintaining robust connectivity and operational efficiency in varying radio environments. Additionally, or alternatively, the techniques and aspects described herein may enable precise communication between the network node and the UE, thus enhancing a wireless communication system’s reliability and facilitating energy-efficient practices in next-generation wireless networks without compromising the robustness of synchronization and measurement processes. In this way, the techniques and aspects described herein may conserve processing resources, memory resources, network resources, or the like.
[0096] As indicated above, Figs. 4A-4E are provided as examples. Other examples may differ from what is described with regard to Figs. 4A-4E.
[0097] Figs. 5A-5C are diagrams of examples associated with SSB burst periodicity adaptation. As shown in Fig. 5A, and by example 500, a network node 110 (e.g., a base station, a CU, a DU, or an RU) may communicate with a UE 120. In some aspects, the network node 110 and the UE 120 may be part of a wireless network (e.g., the wireless communication network 100) . The UE 120 and the network node 110 may have established a wireless connection prior to operations shown in Fig. 5A. In some aspects, the UE 120 or the network node 110 may support SSB burst transmissions (e.g., OD-SSB burst transmissions or additional SSB burst transmissions) for a secondary serving cell. For example, the UE 120 may be configured to operate in a CA mode, and the network node may be associated with a PCell or PSCell associated with the CA mode. More particularly, the network node 110 may be associated with a PCell or PSCell or may be otherwise capable of configuring the UE 120 with parameters related to SSB burst transmission in an SCell or transmitting indications to the UE 120 related to additional SSB burst transmissions in the SCell.
[0098] In some aspects, as shown by reference number 505, the UE 120 may transmit capability information. The capability information may be included in a capability report. The UE 120 may transmit the capability information via an uplink communication, a sidelink communication, a unicast communication, a broadcast communication, a UE assistance information (UAI) communication, a UCI communication, a sidelink control information (SCI) communication, a MAC-CE communication, an RRC communication, a PUCCH, a PUSCH, a physical sidelink control channel (PSCCH) , or a physical sidelink shared channel (PSSCH) , among other examples. The capability information may indicate one or more parameters associated with respective capabilities of the UE 120. The one or more parameters may be indicated via respective information elements (IEs) included in a capability report.
[0099] The capability information may indicate whether the UE 120 supports a feature or one or more parameters related to the feature. For example, the capability information may indicate a capability or parameter for receiving additional SSB burst transmissions in a secondary serving cell. As another example, the capability information may indicate a capability or parameter for measuring additional SSB burst transmissions in a secondary serving cell (e.g., an SCell associated with CA) or adapting an SSB burst periodicity for the secondary serving cell. One or more operations described herein may be based on capability information. For example, the UE 120 may perform a communication in accordance with the capability information, or may receive configuration information that is in accordance with the capability information. In some aspects, the capability information may indicate UE support for receiving one or more SSB burst periodicity adaptation indicators, UE support for identifying an applicable SSB burst periodicity based at least in part on the one or more SSB burst periodicity adaptation indicators, or UE support for measuring SSBs in a secondary serving cell based at least in part on the one or more SSB burst periodicity adaptation indicators.
[0100] As shown by reference number 510, the network node 110 may transmit, and the UE 120 may receive, configuration information. In some aspects, the UE 120 may receive the configuration information via one or more of system information signaling (e.g., a master information block (MIB) or a system information block (SIB) , among other examples) , RRC signaling, MAC signaling (e.g., one or more MAC-CEs) , or physical layer signaling (e.g., DCI) , among other examples.
[0101] In some aspects, the configuration information may indicate one or more candidate configurations or communication parameters. In some aspects, the one or more candidate configurations or communication parameters may be selected, activated, or deactivated by a subsequent indication. For example, the subsequent indication may select a candidate configuration or communication parameter from the one or more candidate configurations or communication parameters. In some aspects, the subsequent indication may include a dynamic indication, such as one or more MAC-CEs or one or more DCI messages, among other examples.
[0102] In some aspects, the configuration information may include an indication of a selection of one or more configuration parameters (e.g., a selection of the one or more configuration parameters already known to the UE 120 or previously indicated by the network node or other network device) , or explicit configuration information for the UE 120 to use to configure the UE 120, among other examples.
[0103] In some examples, the configuration information may not be expressly signaled to the UE 120. For example, in some aspects, the configuration information may at least partially be defined by a wireless communication standard, such as the 3GPP. In such examples, the network node 110 may not explicitly indicate such configuration information to the UE 120. For example, the UE 120 may optionally obtain at least a portion of the configuration information from a configuration stored by the UE 120 (e.g., an original equipment manufacturer (OEM) configuration) . In some aspects, the configuration information may include a parameter or index that is indicative of information defined, or otherwise fixed, by a wireless communication standard, such as the 3GPP (e.g., rather than explicitly indicating the information) .
[0104] In some aspects, the UE 120 may be configured or indicated to adapt an SSB burst periodicity in a secondary serving cell (e.g., an SCell associated with CA) . Put another way, the UE 120 may be configured or indicated to adapt time-domain locations of SSB bursts in the secondary serving cell (with other features of the SSB bursts remaining the same before and after adaptation, such as frequency locations of the SSB bursts or spatial relations (in terms of a quasi co-location (QCL) assumption) for the same SSB index) . In such aspects, the configuration information may indicate a set of candidate SSB burst periodicities for the secondary serving cell.
[0105] More particularly, the configuration information may indicate a base or default SSB burst periodicity for the secondary serving cell, such as via a serving cell SSB periodicity parameter (sometimes referred to herein as ssb-periodicityServingCell) received via a serving cell common configuration IE (sometimes referred to as ServingCellConfigCommon) associated with the secondary serving cell. Moreover, the UE 120 may be configured with a set of candidate SSB burst periodicities (e.g., X additional SSB burst periodicities) , such as via a serving cell candidate SSB set periodicity parameter (sometimes referred to herein as ssb-periodicitySetServingCell or addl-SSB-Periodicity) received via the serving cell common configuration IE (e.g., ServingCellConfigCommon) . In some aspects, a size of the set of candidate SSB burst periodicities (e.g., X, which may correspond to a quantity of candidate SSB burst periodicities included in ssb-periodicitySetServingCell or addl-SSB-Periodicity) may be fixed according to a predefined rule, such as a rule defined by a wireless communication standard (e.g., a wireless communication standard promulgated by the 3GPP) . In some other aspects, a size of the set of candidate SSB burst periodicities may be indicated by a common configuration that is applicable to all secondary serving cells. Put another way, X may be configured and common for all secondary serving cells associated with a certain PCell or PSCell. In some other aspects, a size of the set of candidate SSB burst periodicities may be indicated by a dedicated configuration that is specific to a group of secondary serving cells (e.g., a subset of all secondary serving cells) . Put another way, X may be configured and may differ among different groups of secondary serving cells associated with a certain PCell or PSCell. In some other aspects, a size of the set of candidate SSB burst periodicities (e.g., X) may be indicated by a dedicated configuration that is specific to a particular secondary serving cell associated with the PCell or PSCell. Put another way, X may be configured and may differ among the secondary serving cells associated with a PCell or PSCell.
[0106] As described in more detail below, in some aspects, an SSB burst periodicity may be adapted using a dynamic indication, such as a DCI message (e.g., a DCI format 2_9 message) , signaled by the network node 110 to the UE 120. In such aspects, the DCI message may include a quantity of bits (sometimes referred to herein as k bits) indicating SSB burst periodicity adaptation information (e.g., an SSB burst periodicity indication, described in more detail below) , such as by including k bits to indicate information used by the UE 120 to identify an applicable SSB burst periodicity, from the X + 1 configured SSB burst periodicities, to be used in the secondary serving cell. Put another way, in some aspects the DCI message may include a k-bit field used to select one applicable SSB burst periodicity from a set of X + 1 periodicity values (e.g., the base or default SSB burst periodicity configured via the ssb-periodicityServingCell parameter of the ServingCellConfigCommon, as well as the X candidate SSB burst periodicities indicated by the ssb-periodicitySetServingCell parameter or addl-SSB-Periodicity of the ServingCellConfigCommon) . In such aspects, the configuration information may include an SSB burst periodicity adaptation indicator (e.g., an RRC parameter sometimes referred to herein as ssbPeriodicityAdaptation) indicating whether an information block in a DCI message includes the SSB burst periodicity adaptation information.
[0107] For example, the SSB burst periodicity adaptation indicator (e.g., ssbPeriodicityAdaptation) may be used to indicate that the information block in the DCI message includes one of zero bits associated with the SSB burst periodicity adaptation information or a quantity of bits (e.g., k bits) associated with the SSB burst periodicity adaptation information for the secondary serving cell. In some aspects, the SSB burst periodicity adaptation indicator may be a one-bit indicator that, when set to one of 0 or 1, indicates that the information block in the DCI message includes the zero bits of SSB burst periodicity adaptation information and, when set to the other one of 0 or 1, indicates that the information block in the DCI message includes the k bits of SSB burst periodicity adaptation information. In such aspects, the SSB burst periodicity adaptation indicator may indicate zero bits when SSB burst periodicity adaptation is not applied to serving cells associated with the information block, or the SSB burst periodicity adaptation indicator may indicate k bits when SSB burst periodicity adaptation is being applied to serving cells associated with the information block.
[0108] As described in more detail below in connection with reference number 515, in some aspects, an information block including the SSB burst periodicity adaptation information (e.g., the k bits) may be a same information block that includes a cell DTX / DRX indication (e.g., the DCI message may include a single information block per serving cell that is common for both cell DTX / DRX operation and SSB burst periodicity adaptation) , while, in some other aspects, an information block including the SSB burst periodicity adaptation information may be a different information block than an information block that includes cell DTX / DRX information (e.g., the DCI message may include a set of one of more information blocks indicating cell DTX / DRX indications for one or more serving cells and a different set of one or more information blocks indicating SSB burst periodicity adaptation information for one or more serving cells) . Moreover, in some implementations, the configuration information may further indicate a location of (e.g., by indicating a starting position of) the information block containing SSB burst periodicity adaptation information within the DCI message. More particularly, the configuration information may include an SSB burst periodicity adaptation information position indicator (e.g., an RRC parameter sometimes referred to as positionInDCI-ssbAdaptation or positionInDCI-ssbPeriod) that indicates a starting position of the information block in the DCI message that includes the SSB burst periodicity adaptation information for the particular secondary serving cell. Put another way, the SSB burst periodicity adaptation information position indicator (e.g., positionInDCI-ssbAdaptation or positionInDCI-ssbPeriod) may be used by the network node 110 to inform the UE 120 of the starting position of an information block associated with a serving cell for determining the k bits for the SSB burst periodicity adaptation. Additionally, or alternatively, the information block including the SSB burst adaptation information (e.g., the k bits) may be provided after the cell DTX / DRX indication in the DCI message (e.g., a DCI format 2_9 message) , which is described in more detail below in connection with reference number 515.
[0109] The UE 120 may configure itself based at least in part on the configuration information. In some aspects, the UE 120 may be configured to perform one or more operations described herein based at least in part on the configuration information.
[0110] As indicated by reference number 515, the network node 110 may transmit, and the UE 120 may receive, a DCI message indicating SSB burst adaptation information for one or more serving cells. In some aspects, the DCI message may be associated with a DCI format 2_9 message that is repurposed or otherwise used to indicate the SSB burst periodicity adaptation information. Using a DCI format 2_9 message to indicate the SSB burst periodicity adaptation information enables efficient, low-latency, and flexible signaling of SSB periodicity changes to the UE 120 by enabling the network to dynamically adapt SSB burst periodicity according to current network conditions or UE requirements, thereby optimizing synchronization opportunities, reducing unnecessary energy consumption, and improving overall network resource utilization. Additionally, leveraging DCI format 2_9, which is already used for cell DTX / DRX signaling, allows for integration with existing control signaling mechanisms, minimizing protocol overhead and implementation complexity. More particularly, a legacy DCI format 2_9 message (e.g., a traditional DCI format 2_9 message that does not include SSB burst periodicity adaptation information) may be used for activating or deactivating a cell DTX / DRX configuration of one or multiple serving cells for one or more UEs, or for providing an NES-mode indication of the primary cell for one or more UEs. In such examples, the legacy DCI format 2_9 message may include a cyclic redundancy check (CRC) that is scrambled by a cell DTX / DRX radio network temporary identifier (sometimes referred to as cellDTRX-RNTI) associated with the UE 120. Moreover, the legacy DCI format 2_9 message may include multiple (e.g., N) information blocks, with a starting position of a block associated with a serving cell being determined by a parameter positionInDCI-cellDTRX provided by higher layers for the UE 120.
[0111] In such examples, each information block of the legacy DCI format 2_9 message may include a cell DTX / DRX indication, which may include a number of bits determined by one or more factors. For example, if a higher layer parameter cellDTX-DRX-L1activation is configured, the cell DTX / DRX indication may include two bits if a cellDTX-DRX-ConfigType parameter is configured to dtxdrx for the associated serving cell of the block (with the most significant bit (MSB) corresponding to cell DTX configuration and the least significant bit (LSB) corresponding to cell DRX configuration) , or else may include one bit if the cellDTX-DRX-ConfigType parameter is configured to either dtx or drx for the associated serving cell of the block. Moreover, if the higher layer parameter cellDTX-DRX-L1activation is not configured, the cell DTX / DRX indication may include zero bits. Moreover, each information block of the legacy DCI format 2_9 message may include an NES-mode indication. The NES-mode indication may be one bit indicating an NES-specific conditional handover (CHO) execution condition if the higher layer parameter nesEvent is configured and the associated serving cell of the block is the PCell or PSCell, and may be zero bits otherwise. Additionally, or alternatively, in some examples, a size of legacy DCI format 2_9 message may be indicated by the higher layer parameter sizeDCI-2-9.
[0112] Returning to the example in which the DCI message shown in connection with reference number 515 is a DCI format 2_9 message that is used (e.g., repurposed) to indicate the SSB burst periodicity information (e.g., the k bits) , the DCI format 2_9 message may include another set of one or more information blocks that include the SSB burst adaptation information (e.g., the k bits) and that follow the set of one or more information blocks including the cell DTX / DRX indications. For example, following any information blocks used for cell DTX / DRX indications (e.g., following the N information blocks used for the cell DTX / DRX indications, as described above) , the DCI format 2_9 message may include M information blocks used to indicate SSB burst adaptation information for M serving cells, respectively. Put another way, the DCI message shown in connection with reference number 515 may be a DCI format 2_9 message that includes one or more (e.g., N) information blocks indicating respective cell DTX / DRX indications for serving cells, and one or more (e.g., M) information blocks indicating SSB burst periodicity adaptation information for serving cells which are located after the one or more information blocks that includes the cell DTX / DRX indications. In such aspects, a starting position of a block containing SSB burst periodicity adaptation information for a given serving cell may be determined by the SSB burst periodicity adaptation information position indicator described above (e.g., the positionInDCI-ssbAdaptation parameter or positionInDCI-ssbPeriod parameter provided by higher layers for the UE 120) , such as in aspects in which the associated serving cell of the block is an SCell.
[0113] In such aspects, each information block indicating SSB burst periodicity adaptation information (e.g., each of the M information blocks) may include an SSB burst periodicity indication, which may include one of zero bits or k bits, as described above. Moreover, the UE 120 may be capable of identifying whether the SSB burst periodicity indication includes the one of zero bits or k bits, based at least in part on the SSB burst periodicity adaptation indicator (e.g., ssbPeriodicityAdaptation) described above (e.g., based at least in part on whether the ssbPeriodicityAdaptation parameter is set to one of “0” or “1, ” in aspects in which the ssbPeriodicityAdaptation parameter is a one-bit indicator) . In examples in which an information block indicating SSB burst periodicity adaptation information includes the k bits (e.g., in aspects in which the higher layer parameter ssbPeriodicityAdaptation is configured) , the quantity of the k bits may be equal to ceil (log2 (X + 1) ) , with X corresponding to the size of a set of SSB burst periodicities provided by the ssb-periodicitySetServingCell parameter or addl-ssb-Periodicity parameter in ServingCellConfigCommon, as described above.
[0114] Moreover, a value of the k bits may be set to one of multiple candidate values as defined by a data structure, sometimes referred to herein as “Table Y. ” Put another way, the SSB burst periodicity indication may include k (e.g., ceil (log2 (X + 1) ) ) bits as defined in Table Y if the higher layer parameter ssbPeriodicityAdaptation is configured, or 0 bits otherwise. Table Y may include a quantity of entries equal to 2X, which may be used to associate various codepoints (shown in Fig. 5B under the heading “SSB Burst Periodicity Indication) to respective candidate SSB burst periodicities. For example, as shown in Fig. 5B, and by example 520, in aspects in which X = 1, k may be equal to 1 (e.g., ceil (log2 (X + 1) ) = ceil (log2 (2) ) = 1) , and Table Y may include two entries (e.g., 2X = 21 entries) , corresponding to codepoints 0 and 1. In such aspects, the k bits (e.g., the SSB burst periodicity indication) may be set to codepoint “0” to indicate that the SSB burst periodicity provided by ssb-periodicityServingCell in ServingCellConfigCommon is to be used, or else the k bits may be set to codepoint “1” to indicate that the SSB burst periodicity provided by ssb-periodicitySetServingCell or addl-ssb-Periodicity in ServingCellConfigCommon is to be used. Similarly, as further shown in Fig. 5B, and by example 525, in aspects in which X = 2, k may be equal to 2 (e.g., ceil (log2 (X + 1) ) =ceil (log2 (3) ) = 2) , and Table Y may include four entries (e.g., 2X = 22 entries) , corresponding to codepoints 00, 01, 10, and 11. In such aspects, the k bits (e.g., the SSB burst periodicity indication) may be set to codepoint “00” to indicate that the SSB burst periodicity provided by ssb-periodicityServingCell in ServingCellConfigCommon is to be used, the k bits may be set to codepoint “01” to indicate that the first SSB burst periodicity provided by ssb-periodicitySetServingCell or else the first SSB burst periodicity provided by addl-ssb-Periodicity is to be used, or the k bits may be set to codepoint “10” to indicate that the second SSB burst periodicity provided by ssb-periodicitySetServingCell or else the second SSB burst periodicity provided by addl-ssb-Periodicity is to be used (with the remaining codepoint, “11, ” being reserved, as shown in connection with example 525) . Additionally, or alternatively, in aspects in which the DCI message is a DCI format 2_9 message including the M information blocks indicating the SSB burst periodicity adaptation information as described above, the size of DCI format 2_9 message may be indicated by the higher layer parameter sizeDCI-2-9.
[0115] In some other aspects, a single information block may be used for both the cell DTX / DRX indication and indication of the SSB burst periodicity adaptation information (e.g., the k-bits SSB burst periodicity indication described above) . Additionally or alternatively, a starting position of an information block associated with a serving cell may be determined by the parameter positionInDCI-cellDTRX provided by higher layers for the UE 120. Moreover, the SSB burst periodicity adaptation information (e.g., the k-bits SSB burst periodicity indication) may be provided after the cell DTX / DRX indication in the single information block for a respective serving cell.
[0116] More particularly, each information block in the DCI format 2_9 message may include the cell DTX / DRX indication (e.g., two bits if a cellDTX-DRX-ConfigType parameter is configured to dtxdrx for the associated serving cell of the block, one bit if the cellDTX-DRX-ConfigType parameter is configured to either dtx or drx for the associated serving cell of the block, or zero bits if cellDTX-DRX-L1activation is not configured) , or an NES-mode indication (e.g., one bit if nesEvent is configured and the associated serving cell of the block is the PCell or PSCell, or zero bits otherwise) , as described above in connection with the legacy DCI format 2_9 message. In such aspects, the SSB burst periodicity adaptation information (e.g., the k-bits SSB burst periodicity indication) may be provided after the cell DTX / DRX indication (when present) and the NES-mode indication (when present) . More particularly, following the cell DTX / DRX indication (when present) and the NES-mode indication (when present) , the information block may include the SSB burst periodicity indication, which may include one of zero bits or k bits, as described above. Moreover, the UE 120 may be capable of identifying whether the SSB burst periodicity indication includes the one of zero bits or k bits, based at least in part on the SSB burst periodicity adaptation indicator (e.g., ssbPeriodicityAdaptation) described above (e.g., based at least in part on whether the ssbPeriodicityAdaptation parameter is set to one of “0” or “1, ” in aspects in which the ssbPeriodicityAdaptation parameter is a one-bit indicator) . In examples in which an information block includes the k bits (e.g., in aspects in which the higher layer parameter ssbPeriodicityAdaptation is configured) , the quantity of the k bits may be equal to ceil (log2 (X + 1) ) that indicate a corresponding codepoint from Table Y, as described above. Additionally, or alternatively, in aspects in which the DCI message is a DCI format 2_9 message including information blocks that include both the cell DTX / DRX indication and the SSB burst periodicity adaptation information as described above, the size of DCI format 2_9 message may be indicated by the higher layer parameter sizeDCI-2-9.
[0117] In a similar manner as described above in connection with the legacy DCI format 2_9 message, in some aspects the DCI message shown in connection with reference number 515 may include a CRC that is scrambled by cellDTRX-RNTI. For example, in aspects in which a DCI message includes cell DTX / DRX information and the SSB burst periodicity information (using either a single information block for a respective serving cell to indicate both, or else two separate information blocks for a serving cell, including a first information block for the cell DTX / DRX indication and a second information block for the SSB burst periodicity indication) , the DCI message may include a CRC that is scrambled by cellDTRX-RNTI associated with the UE 120.
[0118] However, in some other aspects, the DCI message shown in connection with reference number 515 may include a CRC that is scrambled by an RNTI used to indicate that the DCI message includes the SSB burst periodicity adaptation information. For example, the DCI message may include a CRC that is scrambled by an SSB burst periodicity adaptation RNTI (sometimes referred to as ssbAdaptation-RNTI or ssbPeriodicityIndication-RNTI) associated with the UE 120 to indicate that the DCI message includes the SSB burst periodicity adaptation information. In such aspects, if the DCI message (e.g., the DCI format 2_9 message) includes a CRC that is scrambled by a cellDTRX-RNTI associated with the UE 120, the UE 120 may identify that the DCI message includes one or more (e.g., N) information blocks including cell DTX / DRX information (e.g., the cell DTX / DRX indication or NES-mode indication described above) . On the other hand, if the DCI message (e.g., the DCI format 2_9 message) includes a CRC that is scrambled by an ssbAdaptation-RNTI or ssbPeriodicityIndication-RNTI associated with the UE 120, the UE 120 may identify that the DCI message includes one or more (e.g., M) information blocks including the SSB burst periodicity adaptation information (e.g., the k bits as defined in Table Y if the higher layer parameter ssbPeriodicityAdaptation is configured, or 0 bits otherwise) .
[0119] Additionally, or alternatively, in some aspects the UE 120 may receive the DCI message indicated by reference number 515 (e.g., a DCI format 2_9 message including SSB burst periodicity adaptation information) based at least in part on the secondary serving cell (e.g., the cell associated with the SSB burst periodicity adaptation information) being activated. Put another way, in some aspects the UE 120 may only expect to receive the DCI message (e.g., the DCI format 2_9 message) associated with a serving cell in Scenario 3B, as described above (e.g., a scenario when / after SCell activation is complete and thus the SCell is activated) . Aspects of receiving a DCI message (e.g., a DCI format 2_9 message) associated with a serving cell in Scenario 3B are described in more detail below in connection with Fig. 5C.
[0120] As further shown in Fig. 5A, and as indicated by reference number 530, the UE 120 may identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on at least one of the configuration information described above in connection with reference number 510 or the SSB burst periodicity adaptation information described above in connection with reference number 515. For example, in aspects in which the DCI message does not include SSB burst periodicity adaptation information (e.g., aspects in which ssbPeriodicityAdaptation indicates that the information block includes zero bits of SSB burst periodicity adaptation information) , the UE 120 may identify the applicable SSB burst periodicity using ssb-periodicityServingCell received via ServingCellConfigCommon, among other examples. On the other hand, in aspects in which the DCI message includes the SSB burst periodicity adaptation information (e.g., aspects in which ssbPeriodicityAdaptation indicates that the information block includes the k bits of SSB burst periodicity adaptation information) , the UE 120 may identify the applicable SSB burst periodicity using the codepoint indicated by the k bits of SSB burst periodicity adaptation information (e.g., the UE 120 may identify, using the indicated codepoint and Table Y, the applicable SSB burst periodicity provided by ssb-periodicityServingCell or else one of the X SSB burst periodicities provided by ssb-periodicitySetServingCell or addl-ssb-Periodicity) .
[0121] As indicated by reference number 535, the UE 120 may measure SSBs in secondary serving cell based at least in part on the applicable SSB burst periodicity (e.g., the UE 120 may measure SSBs using the applicable SSB burst periodicity identified by the UE 120 using the configuration information or the SSB burst periodicity adaptation information provided in the DCI message) . Put another way, the UE 120 may operate on the secondary serving cell according to the indicated SSB burst periodicity, or the UE 120 may assume that SSBs are transmitted on the secondary serving cell according to the indicated SSB burst periodicity.
[0122] Fig. 5C shows an example 540 associated with the UE 120 receiving a DCI message (e.g., a DCI format 2_9 message) for an activated SCell (e.g., a cell associated with Scenario 3B, as described above) . The example 540 is associated with Case 2 described above (e.g., a case in which a cell supporting OD-SSB burst operation may also be associated with AO-SSB burst transmissions) , but, in some other aspects, the features described herein may be associated with other cases (e.g., Case 1, in which there is no AO-SSB burst transmission, among other examples) . In this regard, and in a similar manner as described above in connection with Fig. 4B, when the SCell is deactivated, the network node 110 may transmit, and the UE 120 may measure, the AO-SSB bursts (shown using black shading in Fig. 5C) based at least in part on a configured periodicity for the AO-SSB burst transmissions (e.g., a periodicity indicated by RRC signaling or the configuration information described above in connection with reference number 510) . As indicated by reference number 541, the UE 120 may thereafter receive an SCell activation command (which may be substantially similar to the SCell activation command described above in connection with reference numbers 402 and 411) . Additionally, or alternatively, as indicated by reference number 542, the UE 120 may receive a MAC-CE indicating an OD-SSB burst transmission with a periodicity of P1 (which may be substantially similar to the MAC-CE described above in connection with reference number 412) . Accordingly, during a transition period, the UE 120 may measure the OD-SSB bursts with an SSB burst periodicity of P1 (shown using dark stippling in Fig. 5C) . As described above in connection with Figs. 4B and 4C, in some aspects the AO-SSB burst time-domain locations may overlap with certain OD-SSB burst time-domain locations (not shown in Fig. 5C for ease of description) .
[0123] As indicated by reference number 543, once the SCell activation is complete, the UE 120 may continue to measure OD-SSB bursts using the periodicity indicated by the MAC-CE (e.g., P1) . As indicated by reference number 544, the UE 120 may thereafter receive a DCI message (e.g., a DCI format 2_9 message, shown in Fig. 5C as “DCI2_9, ” which may correspond to the DCI message described above in connection with reference number 515) . In this example, the DCI message indicated by reference number 544 may include SSB burst periodicity adaptation information (e.g., the k bits) indicating that the SSB burst periodicity is to be adapted to P2. Accordingly, the UE 120 may begin measuring OD-SSB bursts using the new periodicity indicated by the DCI message (e.g., P2) . As indicated by reference number 545, the UE 120 may thereafter receive an SCell deactivation command (which may be substantially similar to the SCell deactivation command described above in connection with reference numbers 405 and 415) . Accordingly, as indicated by reference number 546, the OD-SSB burst transmission may be terminated, and the UE 120 may cease to measure OD-SSB bursts in the deactivated cell (e.g., the UE 120 may only measure AO-SSB bursts in the deactivated cell) until the UE 120 receives a subsequent MAC-CE (not shown in Fig. 5C) indicating resumption of OD-SSB burst transmission (e.g., resumption of OD-SSB burst transmission with a periodicity of P1, among other examples) .
[0124] Based at least in part on the network node 110 transmitting, and the UE 120 receiving, the DCI message including the SSB burst periodicity adaptation information, the UE 120 or the network node 110 may conserve computing, power, network, or communication resources that may have otherwise been consumed legacy SSB burst transmission procedures. For example, based at least in part on the network node 110 transmitting, and the UE 120 receiving, the DCI message including the SSB burst periodicity adaptation information, the UE 120 or the network node 110 may optimize an SSB burst periodicity based at least in part on an SCell status (e.g., deactivated, activated, transition, or the like) , channel conditions, or similar factors, which may conserve computing, power, network, or communication resources that may have otherwise been consumed by legacy SSB burst transmission procedures.
[0125] As indicated above, Figs. 5A-5C are provided as examples. Other examples may differ from what is described with respect to Figs. 5A-5C.
[0126] Fig. 6 is a diagram illustrating an example process 600 performed, for example, at a UE or an apparatus of a UE. Example process 600 is an example where the apparatus or the UE (e.g., UE 120) performs operations associated with an SSB burst periodicity adaptation indicator.
[0127] As shown in Fig. 6, in some aspects, process 600 may include receiving configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE (block 610) . For example, the UE (e.g., using reception component 802 or communication manager 806, depicted in Fig. 8) may receive configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE, as described above.
[0128] As further shown in Fig. 6, in some aspects, process 600 may include receiving the DCI message (block 620) . For example, the UE (e.g., using reception component 802 or communication manager 806, depicted in Fig. 8) may receive the DCI message, as described above.
[0129] As further shown in Fig. 6, in some aspects, process 600 may include identifying an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information (block 630) . For example, the UE (e.g., using communication manager 806, depicted in Fig. 8) may identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information, as described above.
[0130] As further shown in Fig. 6, in some aspects, process 600 may include measuring SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity (block 640) . For example, the UE (e.g., using communication manager 806, depicted in Fig. 8) may measure SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity, as described above.
[0131] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.
[0132] In a first aspect, process 600 includes receiving configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.
[0133] In a second aspect, alone or in combination with the first aspect, the DCI message is associated with a DCI format 2_9 message.
[0134] In a third aspect, alone or in combination with one or more of the first and second aspects, the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.
[0135] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation RNTI associated with the UE.
[0136] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, receiving the DCI message includes receiving the DCI message based at least in part on the secondary serving cell being activated.
[0137] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the configuration information indicates a default SSB burst periodicity and a set of candidate SSB burst periodicities, and process 600 further includes selecting the applicable SSB burst periodicity from the default SSB burst periodicity and the set of candidate SSB burst periodicities.
[0138] In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, process 600 further includes measuring, before receiving the configuration information, SSBs in the secondary serving cell based at least in part on a first SSB burst periodicity.
[0139] Although Fig. 6 shows example blocks of process 600, in some aspects, process 600 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 6. Additionally, or alternatively, two or more of the blocks of process 600 may be performed in parallel.
[0140] Fig. 7 is a diagram illustrating an example process 700 performed, for example, at a network node or an apparatus of a network node. Example process 700 is an example where the apparatus or the network node (e.g., network node 110) performs operations associated with an SSB burst periodicity adaptation indicator.
[0141] As shown in Fig. 7, in some aspects, process 700 may include transmitting, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE (block 710) . For example, the network node (e.g., using transmission component 904 or communication manager 906, depicted in Fig. 9) may transmit, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE, as described above.
[0142] As further shown in Fig. 7, in some aspects, process 700 may include transmitting, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information (block 720) . For example, the network node (e.g., using transmission component 904 or communication manager 906, depicted in Fig. 9) may transmit, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information, as described above.
[0143] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below or in connection with one or more other processes described elsewhere herein.
[0144] In a first aspect, process 700 includes transmitting, to the UE, configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.
[0145] In a second aspect, alone or in combination with the first aspect, the DCI message is associated with a DCI format 2_9 message.
[0146] In a third aspect, alone or in combination with one or more of the first and second aspects, the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.
[0147] In a fourth aspect, alone or in combination with one or more of the first through third aspects, the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation RNTI associated with the UE.
[0148] In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, transmitting the DCI message includes transmitting the DCI message based at least in part on the secondary serving cell being activated.
[0149] Although Fig. 7 shows example blocks of process 700, in some aspects, process 700 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 7. Additionally, or alternatively, two or more of the blocks of process 700 may be performed in parallel.
[0150] Fig. 8 is a diagram of an example apparatus 800 for wireless communication. The apparatus 800 may be a UE, or a UE may include the apparatus 800. In some aspects, the apparatus 800 includes a reception component 802, a transmission component 804, or a communication manager 806, which may be in communication with one another (for example, via one or more buses or one or more other components) . In some aspects, the communication manager 806 is the communication manager 150 described in connection with Fig. 1. As shown, the apparatus 800 may communicate with another apparatus 808, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 802 and the transmission component 804. The communication manager 806 may be included in, or implemented via, a processing system (for example, the processing system 140 described in connection with Fig. 1) of the UE.
[0151] In some aspects, the apparatus 800 may be configured to perform one or more operations described herein in connection with Figs. 5A-5C. Additionally, or alternatively, the apparatus 800 may be configured to perform one or more processes described herein, such as process 600 of Fig. 6. In some aspects, the apparatus 800 or one or more components shown in Fig. 8 may include one or more components of the UE described in connection with Fig. 1. Additionally, or alternatively, one or more components shown in Fig. 8 may be implemented within one or more components described in connection with Fig. 1. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.
[0152] The reception component 802 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 808. The reception component 802 may provide received communications to one or more other components of the apparatus 800. In some aspects, the reception component 802 may perform signal processing on the received communications, and may provide the processed signals to the one or more other components of the apparatus 800. In some aspects, the reception component 802 may include one or more components of the UE described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the UE.
[0153] The transmission component 804 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 808. In some aspects, one or more other components of the apparatus 800 may generate communications and may provide the generated communications to the transmission component 804 for transmission to the apparatus 808. In some aspects, the transmission component 804 may perform signal processing on the generated communications, and may transmit the processed signals to the apparatus 808. In some aspects, the transmission component 804 may include one or more components of the UE described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the UE described in connection with Fig. 1. In some aspects, the transmission component 804 may be co-located with the reception component 802.
[0154] The communication manager 806 may support operations of the reception component 802 or the transmission component 804. For example, the communication manager 806 may receive information associated with configuring reception of communications by the reception component 802 or transmission of communications by the transmission component 804. Additionally, or alternatively, the communication manager 806 may generate or provide control information to the reception component 802 or the transmission component 804 to control reception or transmission of communications.
[0155] The reception component 802 may receive configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The reception component 802 may receive the DCI message. The communication manager 806 may identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information. The communication manager 806 may measure SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.
[0156] The reception component 802 may receive configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.
[0157] The communication manager 806 may select the applicable SSB burst periodicity from a default SSB burst periodicity and a set of candidate SSB burst periodicities.
[0158] The communication manager 806 may measure, before receiving the configuration information, SSBs in the secondary serving cell based at least in part on a first SSB burst periodicity.
[0159] The number and arrangement of components shown in Fig. 8 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 8. Furthermore, two or more components shown in Fig. 8 may be implemented within a single component, or a single component shown in Fig. 8 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 8 may perform one or more functions described as being performed by another set of components shown in Fig. 8.
[0160] Fig. 9 is a diagram of an example apparatus 900 for wireless communication. The apparatus 900 may be a network node, or a network node may include the apparatus 900. In some aspects, the apparatus 900 includes a reception component 902, a transmission component 904, or a communication manager 906, which may be in communication with one another (for example, via one or more buses or one or more other components) . In some aspects, the communication manager 906 is the communication manager 155 described in connection with Fig. 1. As shown, the apparatus 900 may communicate with another apparatus 908, such as a UE or a network node (such as a CU, a DU, an RU, or a base station) , using the reception component 902 and the transmission component 904. The communication manager 906 may be included in, or implemented via, a processing system (for example, the processing system 145 described in connection with Fig. 1) of the network node.
[0161] In some aspects, the apparatus 900 may be configured to perform one or more operations described herein in connection with Figs. 5A-5C. Additionally, or alternatively, the apparatus 900 may be configured to perform one or more processes described herein, such as process 700 of Fig. 7. In some aspects, the apparatus 900 or one or more components shown in Fig. 9 may include one or more components of the network node described in connection with Fig. 1. Additionally, or alternatively, one or more components shown in Fig. 9 may be implemented within one or more components described in connection with Fig. 1. Additionally, or alternatively, one or more components of the set of components may be implemented at least in part as software stored in one or more memories. For example, a component (or a portion of a component) may be implemented as instructions or code stored in a non-transitory computer-readable medium and executable by one or more controllers or one or more processors to perform the functions or operations of the component.
[0162] The reception component 902 may receive communications, such as reference signals, control information, data communications, or a combination thereof, from the apparatus 908. The reception component 902 may provide received communications to one or more other components of the apparatus 900. In some aspects, the reception component 902 may perform signal processing on the received communications, and may provide the processed signals to the one or more other components of the apparatus 900. In some aspects, the reception component 902 may include one or more components of the network node described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the network node. In some aspects, the reception component 902 or the transmission component 904 may include or may be included in a network interface. The network interface may be configured to obtain or output signals for the apparatus 900 via one or more communications links, such as a backhaul link, a midhaul link, or a fronthaul link.
[0163] The transmission component 904 may transmit communications, such as reference signals, control information, data communications, or a combination thereof, to the apparatus 908. In some aspects, one or more other components of the apparatus 900 may generate communications and may provide the generated communications to the transmission component 904 for transmission to the apparatus 908. In some aspects, the transmission component 904 may perform signal processing on the generated communications, and may transmit the processed signals to the apparatus 908. In some aspects, the transmission component 904 may include one or more components of the network node described above in connection with Fig. 1, such as a radio, one or more RF chains, one or more transceivers, or one or more modems, each of which may in turn be coupled with one or more antennas of the network node described in connection with Fig. 1. In some aspects, the transmission component 904 may be co-located with the reception component 902.
[0164] The communication manager 906 may support operations of the reception component 902 or the transmission component 904. For example, the communication manager 906 may receive information associated with configuring reception of communications by the reception component 902 or transmission of communications by the transmission component 904. Additionally, or alternatively, the communication manager 906 may generate or provide control information to the reception component 902 or the transmission component 904 to control reception or transmission of communications.
[0165] The transmission component 904 may transmit, to a UE, configuration information that includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of an information block in a DCI message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE. The transmission component 904 may transmit, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information.
[0166] The transmission component 904 may transmit, to the UE, configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.
[0167] The number and arrangement of components shown in Fig. 9 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 9. Furthermore, two or more components shown in Fig. 9 may be implemented within a single component, or a single component shown in Fig. 9 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of (one or more) components shown in Fig. 9 may perform one or more functions described as being performed by another set of components shown in Fig. 9.
[0168] The following provides an overview of some Aspects of the present disclosure:
[0169] Aspect 1: A method of wireless communication performed by a user equipment (UE) , comprising: receiving configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation indicator that indicates whether an information block in a downlink control information (DCI) message includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; receiving the DCI message; identifying an applicable SSB burst periodicity for the secondary serving cell based at least in part on at least one of the configuration information or the SSB burst periodicity adaptation information; and measuring SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.
[0170] Aspect 2: The method of Aspect 1, further comprising receiving configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is one of: fixed according to a predefined rule, indicated by a common configuration that is applicable to all secondary serving cells, indicated by a dedicated configuration that is specific to a group of secondary serving cells, or indicated by a dedicated configuration that is specific to the secondary serving cell.
[0171] Aspect 3: The method of any of Aspects 1-2, wherein the SSB burst periodicity adaptation indicator indicates that the information block in the DCI message includes one of zero bits associated with the SSB burst periodicity adaptation information or a quantity of bits associated with the SSB burst periodicity adaptation information for the secondary serving cell.
[0172] Aspect 4: The method of any of Aspects 1-3, wherein the DCI message is associated with a DCI format 2_9 message.
[0173] Aspect 5: The method of any of Aspects 1-4, wherein the SSB burst periodicity adaptation indicator indicates that the information block in the DCI message includes the SSB burst periodicity adaptation information, and wherein the configuration information further includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of the information block in the DCI message.
[0174] Aspect 6: The method of Aspect 5, wherein the DCI message includes a set of one or more information blocks indicating one or more cell discontinuous transmission (DTX) / discontinuous reception (DRX) indications, and wherein another set of one or more information blocks that include the SSB burst periodicity adaptation information is located after the set of one or more information blocks indicating the one or more cell DTX / DRX indications.
[0175] Aspect 7: The method of any of Aspects 1-5, wherein the information block that includes the SSB burst periodicity adaptation information is an information block associated with a cell discontinuous transmission (DTX) / discontinuous reception (DRX) indication for the secondary serving cell, and wherein the SSB burst periodicity adaptation information is located after the cell DTX / DRX indication in the information block.
[0176] Aspect 8: The method of any of Aspects 1-7, wherein the SSB burst periodicity adaptation indicator indicates that the information block in the DCI message includes the SSB burst periodicity adaptation information, and wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.
[0177] Aspect 9: The method of any of Aspects 1-8, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.
[0178] Aspect 10: The method of any of Aspects 1-9, wherein receiving the DCI message includes receiving the DCI message based at least in part on the secondary serving cell being activated.
[0179] Aspect 11: A method of wireless communication performed by a network node, comprising: transmitting, to a user equipment (UE) , configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation indicator that indicates whether an information block in a downlink control information (DCI) message includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; and transmitting, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on at least one of the configuration information or the SSB burst periodicity adaptation information.
[0180] Aspect 12: The method of Aspect 11, further comprising transmitting, to the UE, configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is one of: fixed according to a predefined rule, indicated by a common configuration that is applicable to all secondary serving cells, indicated by a dedicated configuration that is specific to a group of secondary serving cells, or indicated by a dedicated configuration that is specific to the secondary serving cell.
[0181] Aspect 13: The method of any of Aspects 11-12, wherein the SSB burst periodicity adaptation indicator indicates that the information block in the DCI message includes one of zero bits associated with the SSB burst periodicity adaptation information or a quantity of bits associated with the SSB burst periodicity adaptation information for the secondary serving cell.
[0182] Aspect 14: The method of any of Aspects 11-13, wherein the DCI message is associated with a DCI format 2_9 message.
[0183] Aspect 15: The method of any of Aspects 11-14, wherein the SSB burst periodicity adaptation indicator indicates that the information block in the DCI message includes the SSB burst periodicity adaptation information, and wherein the configuration information further includes an SSB burst periodicity adaptation information position indicator that indicates a starting position of the information block in the DCI message.
[0184] Aspect 16: The method of Aspect 15, wherein the DCI message includes a set of one or more information blocks indicating one or more cell discontinuous transmission (DTX) / discontinuous reception (DRX) indications, and wherein another set of one or more information blocks that include the SSB burst periodicity adaptation information is located after the set of one or more information blocks indicating the one or more cell DTX / DRX indications.
[0185] Aspect 17: The method of any of Aspects 11-15, wherein the information block that includes the SSB burst periodicity adaptation information is an information block associated with a cell discontinuous transmission (DTX) / discontinuous reception (DRX) indication for the secondary serving cell, and wherein the SSB burst periodicity adaptation information is located after the cell DTX / DRX indication in the information block.
[0186] Aspect 18: The method of any of Aspects 11-17, wherein the SSB burst periodicity adaptation indicator indicates that the information block in the DCI message includes the SSB burst periodicity adaptation information, and wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.
[0187] Aspect 19: The method of any of Aspects 11-18, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.
[0188] Aspect 20: The method of any of Aspects 11-19, wherein transmitting the DCI message includes transmitting the DCI message based at least in part on the secondary serving cell being activated.
[0189] Aspect 21: A method of wireless communication performed by a user equipment (UE) , comprising: receiving configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation information position indicator that indicates a starting position of an information block in a downlink control information (DCI) message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; receiving the DCI message; identifying an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information; and measuring SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.
[0190] Aspect 22: The method of Aspect 21, further comprising receiving configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.
[0191] Aspect 23: The method of any of Aspects 21-22, wherein the DCI message is associated with a DCI format 2_9 message.
[0192] Aspect 24: The method of any of Aspects 21-23, wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.
[0193] Aspect 25: The method of any of Aspects 21-24, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.
[0194] Aspect 26: The method of any of Aspects 21-25, wherein receiving the DCI message includes receiving the DCI message based at least in part on the secondary serving cell being activated.
[0195] Aspect 27: The method of any of Aspects 21-26, wherein the configuration information indicates a default SSB burst periodicity and a set of candidate SSB burst periodicities, and wherein the method further comprises selecting the applicable SSB burst periodicity from the default SSB burst periodicity and the set of candidate SSB burst periodicities.
[0196] Aspect 28: The method of any of Aspects 21-27, further comprising measuring, before receiving the configuration information, SSBs in the secondary serving cell based at least in part on a first SSB burst periodicity.
[0197] Aspect 29: A method of wireless communication performed by a network node, comprising: transmitting, to a user equipment (UE) , configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation information position indicator that indicates a starting position of an information block in a downlink control information (DCI) message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; and transmitting, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information.
[0198] Aspect 30: The method of Aspect 29, further comprising transmitting, to the UE, configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell, wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.
[0199] Aspect 31: The method of any of Aspects 29-30, wherein the DCI message is associated with a DCI format 2_9 message.
[0200] Aspect 32: The method of any of Aspects 29-31, wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.
[0201] Aspect 33: The method of any of Aspects 29-32, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.
[0202] Aspect 34: The method of any of Aspects 29-33, wherein transmitting the DCI message includes transmitting the DCI message based at least in part on the secondary serving cell being activated
[0203] Aspect 35: An apparatus for wireless communication at a device, the apparatus comprising one or more processors; one or more memories coupled with the one or more processors; and instructions stored in the one or more memories and executable by the one or more processors to cause the apparatus to perform the method of one or more of Aspects 1-34.
[0204] Aspect 36: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors configured to cause the device to perform the method of one or more of Aspects 1-34.
[0205] Aspect 37: An apparatus for wireless communication, the apparatus comprising at least one means for performing the method of one or more of Aspects 1-34.
[0206] Aspect 38: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to perform the method of one or more of Aspects 1-34.
[0207] Aspect 39: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform the method of one or more of Aspects 1-34.
[0208] Aspect 40: A device for wireless communication, the device comprising a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-34.
[0209] Aspect 41: An apparatus for wireless communication at a device, the apparatus comprising one or more memories and one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the device to perform the method of one or more of Aspects 1-34.
[0210] Aspect 42: A device comprising a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the device to perform the method of one or more of Aspects 1-34.
[0211] Aspect 43: A device comprising a processing system that includes processor circuitry and code-storing memory circuitry, the processing system configured to cause the device to perform the method of one or more of Aspects 1-34.
[0212] It will be apparent that systems or methods described herein may be implemented in different forms of hardware or a combination of hardware and software. A component being configured to perform a function means that the component has a capability to perform the function, and does not require the function to be actually performed by the component, unless noted otherwise.
[0213] As used herein, the term “determine” or “determining” can encompass one or more of a wide variety of actions. For example, “determining” can include one or more of calculating, computing, processing, deriving, detecting, estimating, investigating, looking up, inferring, ascertaining, measuring, resolving, selecting, choosing, obtaining, identifying, interpreting, demodulating, decoding, reading, establishing, forming or generating, among other examples. In some such examples, determining can involve a processor performing some type of calculating, computing, deriving, estimating, inferring, ascertaining, resolving, predicting or other processing to obtain one or more numerical values, sets, elements or other information or results. In some other such examples, determining can involve a processor identifying, looking up, investigating or otherwise obtaining some type of value, set, element or other information or result from a table, a data structure, a database or other memory device or location. In some other such examples, determining can involve a processor identifying, interpreting, demodulating, decoding, detecting, reading or otherwise obtaining some type of value, set, element or other information or result signaled in, for example, a received wireless packet. In some other such examples, determining can involve a processor selecting or choosing one or more values, sets, elements or other information or results from a larger set of values, sets elements or other information or results. In some other such examples, determining can involve a processor performing a measurement, such as on a received signal.
[0214] As used herein, the articles “a” and “an” are intended to refer to one or more items and may be used interchangeably with “one or more” or “at least one. ” As used herein, a phrase referring to “at least one of” or “one or more of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover: a, b, c, a-b, a-c, b-c, and a-b-c. Additionally, as used herein, a phrase referring to “a” or “an” element refers to one or more of such elements acting individually or collectively to perform the recited function (s) . Additionally, as used herein, a “set” can refer to one or more items, and a “subset” can refer to a whole set or less than the whole set, but not an empty set. “Set, ” “group, ” and similar terms are intended to include one or more items and may be used interchangeably with “one or more. ” Furthermore, as used herein, the term “or” is intended to be interpreted in the inclusive sense (such as when referring to a series) and may be used interchangeably with “and / or, ” unless otherwise explicitly indicated (for example, if used in conjunction with “either” or “only one of” ) . For example, “Aor B” may include A only, B only, or a combination of A and B. Also, as used herein, the terms “has, ” “have, ” “having, ” “comprise, ” “comprising, ” “include” and “including, ” and derivatives thereof or similar terms are intended to be open-ended terms that do not limit an element that they modify (for example, an element “having” A also may have B) .
[0215] As used herein, the phrase “associated with” is intended to be interpreted in the inclusive sense, unless otherwise explicitly indicated. For example, the phrase “associated with” is not to be construed as a reference to a closed set of conditions, factors, criteria, elements, components, or actions, among other examples. Specifically, unless a phrase refers to “associated with only ‘a, ’ ” or the equivalent in context, whatever it is that is “associated with ‘a, ’ ” may be associated with “a” alone or associated with a combination of “a” and one or more other conditions, factors, criteria, elements, components, or actions, among other examples. In various examples, the phrase “associated with” may be interpreted to mean “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” or “using” as appropriate in the relevant context unless otherwise explicitly indicated. Furthermore, what follows the phrase “associated with, ” “in association with, ” “in accordance with, ” “based on, ” “based at least in part on, ” “as a function of, ” “in response to, ” “responsive to, ” or “using” is not necessarily the focal point or primary factor associated with the limitation preceding the phrase.
[0216] As used herein, “satisfying a threshold” may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, or not equal to the threshold, among other examples.
[0217] Even though particular combinations of features are recited in the claims or disclosed in the specification, these combinations are not intended to limit the scope of all aspects described herein. Many of these features may be combined in ways not specifically recited in the claims or disclosed in the specification. The disclosure of various aspects includes each dependent claim in combination with every other claim in the claim set.
Claims
1.A user equipment (UE) , comprising:a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the UE to:receive configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation information position indicator that indicates a starting position of an information block in a downlink control information (DCI) message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE;receive the DCI message;identify an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information; andmeasure SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.2.The UE of claim 1, wherein the processing system is configured to cause the UE to receive configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell,wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.3.The UE of claim 1, wherein the DCI message is associated with a DCI format 2_9 message.4.The UE of claim 1, wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.5.The UE of claim 1, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.6.The UE of claim 1, wherein the processing system, to cause the UE to receive the DCI message, is configured to cause the UE to receive the DCI message based at least in part on the secondary serving cell being activated.7.The UE of claim 1, wherein the configuration information indicates a default SSB burst periodicity and a set of candidate SSB burst periodicities, andwherein the processing system is further configured to cause the UE to select the applicable SSB burst periodicity from the default SSB burst periodicity and the set of candidate SSB burst periodicities.8.The UE of claim 1, wherein the processing system is configured to cause the UE to measure, before receiving the configuration information, SSBs in the secondary serving cell based at least in part on a first SSB burst periodicity.9.A network node, comprising:a processing system that includes one or more processors and one or more code-storing memories coupled with the one or more processors, the processing system configured to cause the network node to:transmit, to a user equipment (UE) , configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation information position indicator that indicates a starting position of an information block in a downlink control information (DCI) message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; andtransmit, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be the configuration information and the SSB burst periodicity adaptation information.10.The network node of claim 9, wherein the processing system is configured to cause the network node to transmit, to the UE, configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell,wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.11.The network node of claim 9, wherein the DCI message is associated with a DCI format 2_9 message.12.The network node of claim 9, wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.13.The network node of claim 9, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.14.The network node of claim 9, wherein the processing system, to cause the network node to transmit the DCI message, is configured to cause the network node to transmit the DCI message based at least in part on the secondary serving cell being activated.15.A method of wireless communication performed by a user equipment (UE) , comprising:receiving configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation information position indicator that indicates a starting position of an information block in a downlink control information (DCI) message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE;receiving the DCI message;identifying an applicable SSB burst periodicity for the secondary serving cell based at least in part on the configuration information and the SSB burst periodicity adaptation information; andmeasuring SSBs in the secondary serving cell based at least in part on the applicable SSB burst periodicity.16.The method of claim 15, further comprising receiving configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell,wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.17.The method of claim 15, wherein the DCI message is associated with a DCI format 2_9 message.18.The method of claim 15, wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.19.The method of claim 15, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.20.The method of claim 15, wherein receiving the DCI message includes receiving the DCI message based at least in part on the secondary serving cell being activated.21.The method of claim 15, wherein the configuration information indicates a default SSB burst periodicity and a set of candidate SSB burst periodicities, andwherein the method further comprises selecting the applicable SSB burst periodicity from the default SSB burst periodicity and the set of candidate SSB burst periodicities.22.The method of claim 15, further comprising measuring, before receiving the configuration information, SSBs in the secondary serving cell based at least in part on a first SSB burst periodicity.23.A method of wireless communication performed by a network node, comprising:transmitting, to a user equipment (UE) , configuration information that includes a synchronization signal block (SSB) burst periodicity adaptation information position indicator that indicates a starting position of an information block in a downlink control information (DCI) message that includes SSB burst periodicity adaptation information for a secondary serving cell associated with the UE; andtransmitting, to the UE, the DCI message, wherein an applicable SSB burst periodicity for the secondary serving cell to be used by the UE for measuring SSBs in the secondary serving cell is based at least in part on the configuration information and the SSB burst periodicity adaptation information.24.The method of claim 23, further comprising transmitting, to the UE, configuration information indicating a set of candidate SSB burst periodicities for the secondary serving cell,wherein a size of the set of candidate SSB burst periodicities is indicated by a dedicated configuration that is specific to the secondary serving cell.25.The method of claim 23, wherein the DCI message is associated with a DCI format 2_9 message.26.The method of claim 23, wherein the SSB burst periodicity adaptation information is indicated using a quantity of bits equal to an expression ceil (log2 (X + 1) ) , wherein X corresponds to a size of a set of candidate SSB burst periodicities for the secondary serving cell.27.The method of claim 23, wherein the DCI message is associated with a cyclic redundancy check that is scrambled by an SSB burst periodicity adaptation radio network temporary identifier associated with the UE.28.The method of claim 23, wherein transmitting the DCI message includes transmitting the DCI message based at least in part on the secondary serving cell being activated.