UE initiated beam reporting for candidate cells
UE-initiated beam reporting for candidate cells addresses mobility challenges in wireless communications by improving handover efficiency and coverage, ensuring reliable connections in dynamic environments.
Patent Information
- Application Number
- PCT/CN2024/110917
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2026-02-12
AI Technical Summary
Wireless communications systems face challenges in maintaining reliable connections as user equipment (UE) moves between cell coverage areas, particularly in complex and dynamic environments, where signal attenuation and blockages occur, leading to inefficiencies in handover processes.
UE-initiated beam reporting is introduced to support beam measurements for candidate cells, allowing the UE to trigger beam reporting based on specific events, enhancing mobility and coverage by extending existing L1/L2 triggered mobility (LTM) procedures.
Improves mobility and maintains coverage by enabling more efficient handover decisions through UE-initiated beam reporting for candidate cells, thereby enhancing user experience and network performance.
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Figure CN2024110917_12022026_PF_FP_ABST
Abstract
Description
UE INITIATED BEAM REPORTING FOR CANDIDATE CELLS
[0001] Field of the Disclosure
[0002] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for beam measurement reporting for candidate cells.
[0003] Description of Related Art
[0004] Wireless communications systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services. These wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available wireless communications system resources with those users.
[0005] Although wireless communications systems have made great technological advancements over many years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Accordingly, there is a continuous desire to improve the technical performance of wireless communications systems, including, for example: improving speed and data carrying capacity of communications, improving efficiency of the use of shared communications mediums, reducing power used by transmitters and receivers while performing communications, improving reliability of wireless communications, avoiding redundant transmissions and / or receptions and related processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access wireless communications systems, increasing the ability for different types of devices to intercommunicate, increasing the number and type of wireless communications mediums available for use, and the like. Consequently, there exists a need for further improvements in wireless communications systems to overcome the aforementioned technical challenges and others.SUMMARY
[0006] One aspect provides a method for wireless communication at a user equipment (UE) . The method includes measuring reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell; detecting at least one event related to the second measurement; generating, after detecting the at least one event, a report that indicates values of at least some of the measurements; and outputting the report.
[0007] Another aspect provides a method for wireless communication at a network entity. The method includes outputting signaling configuring a user equipment (UE) to measure reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell, and to report at least some of the measurements based on detection of at least one event related to the second measurement; and obtaining, from the UE, a report that indicates values of at least some of the measurements.
[0008] Other aspects provide: an apparatus operable, configured, or otherwise adapted to perform any one or more of the aforementioned methods and / or those described elsewhere herein; a non-transitory, computer-readable media comprising instructions that, when executed (e.g., directly, indirectly, after pre-processing, without pre-processing) by one or more processors of an apparatus, cause the apparatus to perform the aforementioned methods as well as those described elsewhere herein; a computer program product embodied on a computer-readable storage medium comprising code for performing the aforementioned methods as well as those described elsewhere herein; and / or an apparatus comprising means for performing the aforementioned methods as well as those described elsewhere herein. By way of example, an apparatus may comprise a processing system, a device with a processing system, or processing systems cooperating over one or more networks.
[0009] The following description and the appended figures set forth certain features for purposes of illustration.BRIEF DESCRIPTION OF DRAWINGS
[0010] The appended figures depict certain features of the various aspects described herein and are not to be considered limiting of the scope of this disclosure.
[0011] FIG. 1 depicts an example wireless communications network.
[0012] FIG. 2 depicts an example disaggregated base station architecture.
[0013] FIG. 3 depicts aspects of an example base station and an example user equipment.
[0014] FIGS. 4A, 4B, 4C, and 4D depict various example aspects of data structures for a wireless communications network.
[0015] FIG. 5 depicts an example scenario with a pre-configured candidate cell set.
[0016] FIG. 6 depicts an example of UE mobility.
[0017] FIG. 7 depicts an example lower-layer triggered mobility (LTM) report without differential reporting.
[0018] FIG. 8 depicts a call flow diagram, in accordance with certain aspects of the present disclosure.
[0019] FIG. 9 depicts a method for wireless communications.
[0020] FIG. 10 depicts a method for wireless communications.
[0021] FIG. 11 depicts aspects of an example communications device.DETAILED DESCRIPTION
[0022] Aspects of the present disclosure provide apparatuses, methods, processing systems, and computer-readable mediums for user equipment (UE) initiated beam measurement reporting for candidate cells.
[0023] In advanced wireless systems, mobility procedures are in place to help maintain network connections for a user equipment (UE) as it moves between the coverage areas of different cells. Mobility procedures generally refer to mechanisms that allow a UE to transition from being served by a source cell to being served by a target / candidate cell, which may generally be referred to as handover.
[0024] In some cases, for physical layer (PHY or Layer 1 / L1) and / or medium access control layer (MAC or Layer 2 / L2) , also referred to as L1 / L2 triggered mobility (LTM) , as a UE moves, a new serving cell (e.g. a primary cell (Pcell) ) may be selected (e.g., reselected) for handover among a set of pre-configured candidate cells based on measurements of reference signal (RS) made at the physical (PHY or L1) layer (referred to as L1 measurements) for those cells. The RSs are typically sent with different beams. To facilitate a handover decision, the UE may generate beam reports containing information about the received signal quality from the different beams of the serving cell and / or candidate cells. These beam reports may then be sent to a serving cell. For example, such beam reports may include measurements (e.g., reference signal (RS) receive power (RSRP) , signal to interference and noise ratio (SINR) ) for M beams for each of L (serving and / or candidate) cells. Thus, the reports may include M x L total measurements.
[0025] A UE may be configured to initiate beam reporting. For example, UE initiated beam reporting may be triggered by certain events. For trigger-event detection, a UE may monitor RSs to assess if a beam-reporting trigger condition has been met. In response to detecting a trigger condition, the UE transmits a beam report, including values for measurements for RSs transmitted using different beams in a serving cell.
[0026] Beam reporting may be via medium access control (MAC) control element (CE) or uplink control information (UCI) . In some cases, a UE may request uplink resources for transmitting the beam report or a gNB may preconfigure uplink resources for transmitting the beam report.
[0027] The beam report, typically including values for measurements for RSs transmitted using different beams in a serving cell. Aspects of the present disclosure, however, provide techniques for extending UE initiated beam reporting to support beam measurements for LTM candidate cells. As a result, the techniques proposed herein may help improve mobility, maintain coverage, and improve user experience.
[0028] Introduction to Wireless Communications Networks
[0029] The techniques and methods described herein may be used for various wireless communications networks. While aspects may be described herein using terminology commonly associated with 3G, 4G, and / or 5G wireless technologies, aspects of the present disclosure may likewise be applicable to other communications systems and standards not explicitly mentioned herein.
[0030] FIG. 1 depicts an example of a wireless communications network 100, in which aspects described herein may be implemented.
[0031] Generally, wireless communications network 100 includes various network entities (alternatively, network elements or network nodes) . A network entity is generally a communications device and / or a communications function performed by a communications device (e.g., a user equipment (UE) , a base station (BS) , a component of a BS, a server, etc. ) . For example, various functions of a network as well as various devices associated with and interacting with a network may be considered network entities. Further, wireless communications network 100 includes terrestrial aspects, such as ground-based network entities (e.g., BSs 102) , and non-terrestrial aspects, such as satellite 140 and aircraft 145, which may include network entities on-board (e.g., one or more BSs) capable of communicating with other network elements (e.g., terrestrial BSs) and user equipments.
[0032] In the depicted example, wireless communications network 100 includes BSs 102, UEs 104, and one or more core networks, such as an Evolved Packet Core (EPC) 160 and 5G Core (5GC) network 190, which interoperate to provide communications services over various communications links, including wired and wireless links.
[0033] FIG. 1 depicts various example UEs 104, which may more generally include: a cellular phone, smart phone, session initiation protocol (SIP) phone, laptop, personal digital assistant (PDA) , satellite radio, global positioning system, multimedia device, video device, digital audio player, camera, game console, tablet, smart device, wearable device, vehicle, electric meter, gas pump, large or small kitchen appliance, healthcare device, implant, sensor / actuator, display, internet of things (IoT) devices, always on (AON) devices, edge processing devices, or other similar devices. UEs 104 may also be referred to more generally as a mobile device, a wireless device, a wireless communications device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, and others.
[0034] BSs 102 wirelessly communicate with (e.g., transmit signals to or receive signals from) UEs 104 via communications links 120. The communications links 120 between BSs 102 and UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a BS 102 and / or downlink (DL) (also referred to as forward link) transmissions from a BS 102 to a UE 104. The communications links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity in various aspects.
[0035] BSs 102 may generally include: a NodeB, enhanced NodeB (eNB) , next generation enhanced NodeB (ng-eNB) , next generation NodeB (gNB or gNodeB) , access point, base transceiver station, radio base station, radio transceiver, transceiver function, transmission reception point, and / or others. Each of BSs 102 may provide communications coverage for a respective geographic coverage area 110, which may sometimes be referred to as a cell, and which may overlap in some cases (e.g., small cell 102’ may have a coverage area 110’ that overlaps the coverage area 110 of a macro cell) . A BS may, for example, provide communications coverage for a macro cell (covering relatively large geographic area) , a pico cell (covering relatively smaller geographic area, such as a sports stadium) , a femto cell (relatively smaller geographic area (e.g., a home) ) , and / or other types of cells.
[0036] While BSs 102 are depicted in various aspects as unitary communications devices, BSs 102 may be implemented in various configurations. For example, one or more components of a base station may be disaggregated, including a central unit (CU) , one or more distributed units (DUs) , one or more radio units (RUs) , a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) , or a Non-Real Time (Non-RT) RIC, to name a few examples. In another example, various aspects of a base station may be virtualized. More generally, a base station (e.g., BS 102) may include components that are located at a single physical location or components located at various physical locations. In examples in which a base station includes components that are located at various physical locations, the various components may each perform functions such that, collectively, the various components achieve functionality that is similar to a base station that is located at a single physical location. In some aspects, a base station including components that are located at various physical locations may be referred to as a disaggregated radio access network architecture, such as an Open RAN (O-RAN) or Virtualized RAN (VRAN) architecture. FIG. 2 depicts and describes an example disaggregated base station architecture.
[0037] Different BSs 102 within wireless communications network 100 may also be configured to support different radio access technologies, such as 3G, 4G, and / or 5G. For example, BSs 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) ) may interface with the EPC 160 through first backhaul links 132 (e.g., an S1 interface) . BSs 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN) ) may interface with 5GC 190 through second backhaul links 184. BSs 102 may communicate directly or indirectly (e.g., through the EPC 160 or 5GC 190) with each other over third backhaul links 134 (e.g., X2 interface) , which may be wired or wireless.
[0038] Wireless communications network 100 may subdivide the electromagnetic spectrum into various classes, bands, channels, or other features. In some aspects, the subdivision is provided based on wavelength and frequency, where frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, or a subband. For example, 3GPP currently defines Frequency Range 1 (FR1) as including 410 MHz –7125 MHz, which is often referred to (interchangeably) as “Sub-6 GHz” . Similarly, 3GPP currently defines Frequency Range 2 (FR2) as including 24, 250 MHz –71, 000 MHz, which is sometimes referred to (interchangeably) as a “millimeter wave” ( “mmW” or “mmWave” ) . In some cases, FR2 may be further defined in terms of sub-ranges, such as a first sub-range FR2-1 including 24, 250 MHz –52, 600 MHz and a second sub-range FR2-2 including 52, 600 MHz –71, 000 MHz. A base station configured to communicate using mmWave / near mmWave radio frequency bands (e.g., a mmWave base station such as BS 180) may utilize beamforming (e.g., 182) with a UE (e.g., 104) to improve path loss and range.
[0039] The communications links 120 between BSs 102 and, for example, UEs 104, may be through one or more carriers, which may have different bandwidths (e.g., 5, 10, 15, 20, 100, 400, and / or other MHz) , and which may be aggregated in various aspects. Carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL) .
[0040] Communications using higher frequency bands may have higher path loss and a shorter range compared to lower frequency communications. Accordingly, certain base stations (e.g., 180 in FIG. 1) may utilize beamforming 182 with a UE 104 to improve path loss and range. For example, BS 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate the beamforming. In some cases, BS 180 may transmit a beamformed signal to UE 104 in one or more transmit directions 182’ . UE 104 may receive the beamformed signal from the BS 180 in one or more receive directions 182” . UE 104 may also transmit a beamformed signal to the BS 180 in one or more transmit directions 182” . BS 180 may also receive the beamformed signal from UE 104 in one or more receive directions 182’ . BS 180 and UE 104 may then perform beam training to determine the best receive and transmit directions for each of BS 180 and UE 104. Notably, the transmit and receive directions for BS 180 may or may not be the same. Similarly, the transmit and receive directions for UE 104 may or may not be the same.
[0041] Wireless communications network 100 further includes a Wi-Fi AP 150 in communication with Wi-Fi stations (STAs) 152 via communications links 154 in, for example, a 2.4 GHz and / or 5 GHz unlicensed frequency spectrum.
[0042] Certain UEs 104 may communicate with each other using device-to-device (D2D) communications link 158. D2D communications link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH) , a physical sidelink discovery channel (PSDCH) , a physical sidelink shared channel (PSSCH) , a physical sidelink control channel (PSCCH) , and / or a physical sidelink feedback channel (PSFCH) .
[0043] EPC 160 may include various functional components, including: a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and / or a Packet Data Network (PDN) Gateway 172, such as in the depicted example. MME 162 may be in communication with a Home Subscriber Server (HSS) 174. MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, MME 162 provides bearer and connection management.
[0044] Generally, user Internet protocol (IP) packets are transferred through Serving Gateway 166, which itself is connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation as well as other functions. PDN Gateway 172 and the BM-SC 170 are connected to IP Services 176, which may include, for example, the Internet, an intranet, an IP Multimedia Subsystem (IMS) , a Packet Switched (PS) streaming service, and / or other IP services.
[0045] BM-SC 170 may provide functions for MBMS user service provisioning and delivery. BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN) , and / or may be used to schedule MBMS transmissions. MBMS Gateway 168 may be used to distribute MBMS traffic to the BSs 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) area broadcasting a particular service, and / or may be responsible for session management (start / stop) and for collecting eMBMS related charging information.
[0046] 5GC 190 may include various functional components, including: an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. AMF 192 may be in communication with Unified Data Management (UDM) 196.
[0047] AMF 192 is a control node that processes signaling between UEs 104 and 5GC 190. AMF 192 provides, for example, quality of service (QoS) flow and session management.
[0048] Internet protocol (IP) packets are transferred through UPF 195, which is connected to the IP Services 197, and which provides UE IP address allocation as well as other functions for 5GC 190. IP Services 197 may include, for example, the Internet, an intranet, an IMS, a PS streaming service, and / or other IP services.
[0049] In various aspects, a network entity or network node can be implemented as an aggregated base station, as a disaggregated base station, a component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.
[0050] FIG. 2 depicts an example disaggregated base station 200 architecture. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that can communicate directly with a core network 220 via a backhaul link, or indirectly with the core network 220 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 225 via an E2 link, or a Non-Real Time (Non-RT) RIC 215 associated with a Service Management and Orchestration (SMO) Framework 205, or both) . A CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an F1 interface. The DUs 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RUs 240 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, the UE 104 may be simultaneously served by multiple RUs 240.
[0051] Each of the units, e.g., the CUs 210, the DUs 230, the RUs 240, as well as the Near-RT RICs 225, the Non-RT RICs 215 and the SMO Framework 205, may include one or more interfaces or be coupled to one or more interfaces configured to receive or transmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communications interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units. Additionally or alternatively, the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as a radio frequency (RF) transceiver) , configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.
[0052] In some aspects, the CU 210 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC) , packet data convergence protocol (PDCP) , service data adaptation protocol (SDAP) , or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 210. The CU 210 may be configured to handle user plane functionality (e.g., Central Unit –User Plane (CU-UP) ) , control plane functionality (e.g., Central Unit –Control Plane (CU-CP) ) , or a combination thereof. In some implementations, the CU 210 can be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as the E1 interface when implemented in an O-RAN configuration. The CU 210 can be implemented to communicate with the DU 230, as necessary, for network control and signaling.
[0053] The 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. In some aspects, the DU 230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by the 3rd Generation Partnership Project (3GPP) . In some aspects, the DU 230 may further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 230, or with the control functions hosted by the CU 210.
[0054] Lower-layer functionality can be implemented by one or more RUs 240. In some deployments, an RU 240, controlled by a DU 230, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT) , inverse FFT (iFFT) , digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like) , or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU (s) 240 can be implemented to handle over the air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control and user plane communications with the RU (s) 240 can be controlled by the corresponding DU 230. In some scenarios, this configuration can enable the DU (s) 230 and the CU 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.
[0055] The SMO Framework 205 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 205 may be configured to 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 205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 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) . Such virtualized network elements can include, but are not limited to, CUs 210, DUs 230, RUs 240 and Near-RT RICs 225. In some implementations, the SMO Framework 205 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 211, via an O1 interface. Additionally, in some implementations, the SMO Framework 205 can communicate directly with one or more RUs 240 via an O1 interface. The SMO Framework 205 also may include a Non-RT RIC 215 configured to support functionality of the SMO Framework 205.
[0056] The Non-RT RIC 215 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, Artificial Intelligence / Machine Learning (AI / ML) workflows including model training and updates, or policy-based guidance of applications / features in the Near-RT RIC 225. The Non-RT RIC 215 may be coupled to or communicate with (such as via an A1 interface) the Near-RT RIC 225. The Near-RT RIC 225 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 210, one or more DUs 230, or both, as well as an O-eNB, with the Near-RT RIC 225.
[0057] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 225, the Non-RT RIC 215 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 225 and may be received at the SMO Framework 205 or the Non-RT RIC 215 from non-network data sources or from network functions. In some examples, the Non-RT RIC 215 or the Near-RT RIC 225 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 215 may monitor long-term trends and patterns for performance and employ AI / ML models to perform corrective actions through the SMO Framework 205 (such as reconfiguration via O1) or via creation of RAN management policies (such as A1 policies) .
[0058] FIG. 3 depicts aspects of an example BS 102 and a UE 104.
[0059] Generally, BS 102 includes various processors (e.g., 320, 330, 338, and 340) , antennas 334a-t (collectively 334) , transceivers 332a-t (collectively 332) , which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 339) . For example, BS 102 may send and receive data between BS 102 and UE 104. BS 102 includes controller / processor 340, which may be configured to implement various functions described herein related to wireless communications.
[0060] Generally, UE 104 includes various processors (e.g., 358, 364, 366, and 380) , antennas 352a-r (collectively 352) , transceivers 354a-r (collectively 354) , which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., retrieved from data source 362) and wireless reception of data (e.g., provided to data sink 360) . UE 104 includes controller / processor 380, which may be configured to implement various functions described herein related to wireless communications.
[0061] In regards to an example downlink transmission, BS 102 includes a transmit processor 320 that may receive data from a data source 312 and control information from a controller / processor 340. The control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical HARQ indicator channel (PHICH) , physical downlink control channel (PDCCH) , group common PDCCH (GC PDCCH) , and / or others. The data may be for the physical downlink shared channel (PDSCH) , in some examples.
[0062] Transmit processor 320 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 320 may also generate reference symbols, such as for the primary synchronization signal (PSS) , secondary synchronization signal (SSS) , PBCH demodulation reference signal (DMRS) , and channel state information reference signal (CSI-RS) .
[0063] Transmit (TX) multiple-input multiple-output (MIMO) processor 330 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 332a-332t. Each modulator in transceivers 332a-332t may process a respective output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from the modulators in transceivers 332a-332t may be transmitted via the antennas 334a-334t, respectively.
[0064] In order to receive the downlink transmission, UE 104 includes antennas 352a-352r that may receive the downlink signals from the BS 102 and may provide received signals to the demodulators (DEMODs) in transceivers 354a-354r, respectively. Each demodulator in transceivers 354a-354r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples to obtain received symbols.
[0065] MIMO detector 356 may obtain received symbols from all the demodulators in transceivers 354a-354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 358 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.
[0066] In regards to an example uplink transmission, UE 104 further includes a transmit processor 364 that may receive and process data (e.g., for the PUSCH) from a data source 362 and control information (e.g., for the physical uplink control channel (PUCCH) ) from the controller / processor 380. Transmit processor 364 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS) ) . The symbols from the transmit processor 364 may be precoded by a TX MIMO processor 366 if applicable, further processed by the modulators in transceivers 354a-354r (e.g., for SC-FDM) , and transmitted to BS 102.
[0067] At BS 102, the uplink signals from UE 104 may be received by antennas 334a-t, processed by the demodulators in transceivers 332a-332t, detected by a MIMO detector 336 if applicable, and further processed by a receive processor 338 to obtain decoded data and control information sent by UE 104. Receive processor 338 may provide the decoded data to a data sink 339 and the decoded control information to the controller / processor 340.
[0068] Memories 342 and 382 may store data and program codes for BS 102 and UE 104, respectively.
[0069] Scheduler 344 may schedule UEs for data transmission on the downlink and / or uplink.
[0070] In various aspects, BS 102 may be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 312, scheduler 344, memory 342, transmit processor 320, controller / processor 340, TX MIMO processor 330, transceivers 332a-t, antenna 334a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 334a-t, transceivers 332a-t, RX MIMO detector 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.
[0071] In various aspects, UE 104 may likewise be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 362, memory 382, transmit processor 364, controller / processor 380, TX MIMO processor 366, transceivers 354a-t, antenna 352a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 352a-t, transceivers 354a-t, RX MIMO detector 356, controller / processor 380, receive processor 358, memory 382, and / or other aspects described herein.
[0072] In some aspects, one or more processors may be configured to perform various operations, such as those associated with the methods described herein, and transmit (output) to or receive (obtain) data from another interface that is configured to transmit or receive, respectively, the data.
[0073] FIGS. 4A, 4B, 4C, and 4D depict aspects of data structures for a wireless communications network, such as wireless communications network 100 of FIG. 1.
[0074] In particular, FIG. 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5G NR) frame structure, FIG. 4B is a diagram 430 illustrating an example of DL channels within a 5G subframe, FIG. 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and FIG. 4D is a diagram 480 illustrating an example of UL channels within a 5G subframe.
[0075] Wireless communications systems may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. Such systems may also support half-duplex operation using time division duplexing (TDD) . OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth (e.g., as depicted in FIGS. 4B and 4D) into multiple orthogonal subcarriers. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and / or in the time domain with SC-FDM.
[0076] A wireless communications frame structure may be frequency division duplex (FDD) , in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for either DL or UL. Wireless communications frame structures may also be time division duplex (TDD) , in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for both DL and UL.
[0077] In FIG. 4A and 4C, the wireless communications frame structure is TDD where D is DL, U is UL, and X is flexible for use between DL / UL. UEs may be configured with a slot format through a received slot format indicator (SFI) (dynamically through DL control information (DCI) , or semi-statically / statically through radio resource control (RRC) signaling) . In the depicted examples, a 10 ms frame is divided into 10 equally sized 1 ms subframes. Each subframe may include one or more time slots. In some examples, each slot may include 7 or 14 symbols, depending on the slot format. Subframes may also include mini-slots, which generally have fewer symbols than an entire slot. Other wireless communications technologies may have a different frame structure and / or different channels.
[0078] In certain aspects, the number of slots within a subframe is based on a slot configuration and a numerology. For example, for slot configuration 0, different numerologies (μ) 0 to 6 allow for 1, 2, 4, 8, 16, 32, and 64 slots, respectively, per subframe. For slot configuration 1, different numerologies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology μ, there are 14 symbols / slot and 2μ slots / subframe. The subcarrier spacing and symbol length / duration are a function of the numerology. The subcarrier spacing may be equal to 2μ×15 kHz, where μ is the numerology 0 to 6. As such, the numerology μ=0 has a subcarrier spacing of 15 kHz and the numerology μ=6 has a subcarrier spacing of 960 kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIGS. 4A, 4B, 4C, and 4D provide an example of slot configuration 0 with 14 symbols per slot and numerology μ=2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs.
[0079] As depicted in FIGS. 4A, 4B, 4C, and 4D, a resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs) ) that extends, for example, 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs) . The number of bits carried by each RE depends on the modulation scheme.
[0080] As illustrated in FIG. 4A, some of the REs carry reference (pilot) signals (RS) for a UE (e.g., UE 104 of FIGS. 1 and 3) . The RS may include demodulation RS (DMRS) and / or channel state information reference signals (CSI-RS) for channel estimation at the UE.The RS may also include beam measurement RS (BRS) , beam refinement RS (BRRS) , and / or phase tracking RS (PT-RS) .
[0081] FIG. 4B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs) , each CCE including, for example, nine RE groups (REGs) , each REG including, for example, four consecutive REs in an OFDM symbol.
[0082] A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE (e.g., 104 of FIGS. 1 and 3) to determine subframe / symbol timing and a physical layer identity.
[0083] A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.
[0084] Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI) . Based on the PCI, the UE can determine the locations of the aforementioned DMRS. The physical broadcast channel (PBCH) , which carries a master information block (MIB) , may be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN) . The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs) , and / or paging messages.
[0085] As illustrated in FIG. 4C, some of the REs carry DMRS (indicated as R for one particular configuration, but other DMRS configurations are possible) for channel estimation at the base station. The UE may transmit DMRS for the PUCCH and DMRS for the PUSCH. The PUSCH DMRS may be transmitted, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. UE 104 may transmit sounding reference signals (SRS) . The SRS may be transmitted, for example, in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.
[0086] FIG. 4D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI) , such as scheduling requests, a channel quality indicator (CQI) , a precoding matrix indicator (PMI) , a rank indicator (RI) , and HARQ ACK / NACK feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR) , a power headroom report (PHR) , and / or UCI.
[0087] Overview of Lower-layer Triggered Mobility (LTM)
[0088] Dynamic mobility signaling may be beneficial in the scenario illustrated in FIG. 5, where a UE may move between a preconfigured set 500 of candidate cells. In the illustrated example, the UE moves from a first cell (e.g., an old serving / primary cell) to a new serving candidate cell. In this case, the UE may not receive data or control information in the candidate cell, but may transmit a PRACH in order to facilitate timing adjustment for the new candidate cell before a cell change.
[0089] As noted above, dynamic mobility signaling (e.g., L1 and / or L2-centric mobility or LTM) may lead to more efficient intra-cell and inter-cell mobility with reduced latency.
[0090] The general concept of LTM signaling may be understood with reference to the example scenario 600 shown in FIG. 6. As illustrated, the network may configure (e.g., via RRC signaling) , a set of cells for L1 / L2 mobility (referred to herein as an L1 / L2 Mobility Configured cell set) . At any given time, the network may also configure (via L1 / L2 signaling) an L1 / L2 Mobility Activated cell set, which refers to a group of cells in the configured set that are activated and can be readily used for data and control transfer. The network may also configure (signal) an L1 / L2 Mobility Deactivated cell set, which refers to a group of cells in the configured set that are deactivated and can be readily activated by L1 / L2 signaling.
[0091] L1 / L2 signaling may be used for mobility management of the activated set. For example, L1 / L2 signaling may be used to activate / deactivate cells in the set, select beams within the activated cells, and update / switch a primary cell (PCell) . This dynamic signaling may help provide seamless mobility within the activated cells in the set. In other words, as the UE moves, the cells from the set are deactivated and activated by L1 / L2 signaling. The cells to activate and deactivate may be based on various factors, such as signal quality (measurements) and loading.
[0092] As in the example illustrated in FIG. 6, in some cases, all cells in the L1 / L2 Mobility Configured cell set may belong to the same DU 630 of a CU 610. This may be similar to carrier aggregation (CA) , but cells may be on the same carrier frequencies. The size of the cell set configured for L1 / L2 mobility signaling may vary. In general, the cell set size may be selected to be large enough to cover a meaningful mobility area.
[0093] In some cases, the UE may be provided with a subset of deactivated cells, as a candidate cell set, from which the UE could autonomously choose to add to the activated cell set. The decision of whether to add a cell from the candidate cell set to the activated cell set may be a based various factors, such as measured channel quality and loading information. In some cases, the ability for the UE to autonomously choose to add to the activated cell set may be similar to a UE decision when configured for Conditional Handover (CHO) for fast and efficient addition of the prepared cells.
[0094] As illustrated in FIG. 6, each cell may be served by an RU. Each of the RUs may have multi-carrier (N CCs) support. In such cases, each CC may be a cell (e.g., Cell 2 and Cell 2’ may be different CCs of the same RU) . In such cases, activation / deactivation can be done in groups of carriers (cells) .
[0095] For PCell management, L1 / L2 signaling may be used to set (select) the PCell out of the preconfigured options within the activated cell set. In some cases, L3 mobility may be used for PCell change (L3 handover) when a new PCell is not from the activated cell set for L1 / L2 mobility. In such cases, RRC signaling may update the set of cells for L1 / L2 mobility at L3 handover.
[0096] In some cases, physical layer (Layer 1 or L1) measurement may be enhanced for L1 / L2 mobility, where a serving cell can be changed via L1 / L2 signalling based on L1 measurement, and both synchronous and asynchronous source and target cells may be considered.
[0097] Various mechanisms and procedures of L1 / L2 based inter-cell mobility may be specified for mobility latency reduction. These may include configuration and maintenance for multiple candidate cells to allow fast application of configurations for candidate cells. Dynamic switching mechanisms among candidate serving cells (including SpCell and SCell) may be supported for the potential applicable scenarios based on L1 / L2 signaling.
[0098] L1 enhancements for inter-cell beam management, may include L1 measurement and reporting, as well as beam indication. Timing Advance (TA) management and CU-DU interface signaling may also be provided to support L1 / L2 mobility.
[0099] L1 / L2 based inter-cell mobility procedures may be applicable to a variety of scenarios. These scenarios may include standalone, CA and new radio-dual connectivity (NR-DC) cases with serving cell change within one cell group (CG) , intra-distributed unit (DU) cases and intra-central unit (CU) inter-DU cases, intra-frequency and inter-frequency scenarios, both FR1 and FR2 scenarios, and scenarios where source and target cells may be synchronized or non-synchronized.
[0100] As noted above, a UE may generate beam reports containing information about the received signal quality of RSs transmitted from the different beams of the serving cell and / or candidate cells, facilitating handover decisions. These beam reports may then be sent to the serving cell (base station) . For example, such beam reports may include measurements for M beams for each of L (serving and / or candidate) cells.
[0101] The UE may provide the report to a serving cell, facilitating handover decisions and mobility procedures. The differential reporting may include various formats, increasing the number of beams that may be reported while significantly reducing overhead associated with processing the beam report.
[0102] FIG. 7 depicts an example LTM report. As illustrated at 702, a single LTM report may include measurements for M beams for each of L configured (e.g., or activated, if introduced) cells. In some cases, the selection of the M beams may be determined at a UE.
[0103] Maximum values of M and L (e.g., the total number of beams that may be reported in a single LTM report) may be based on UE capability. For example, in some cases, M*L = 4 beams may be supported as a UE capability. In some cases, the values of M and L may be configured to the UE in a reporting configuration.
[0104] As illustrated in FIG. 7, the example LTM report indicates an absolute RSRP value associated with each beam. As noted above, these conventional techniques for beam reporting limit the number of beams that may be included in the report, and are associated with significant overhead.
[0105] Aspects Related to UE initiated Beam Reporting for LTM Candidate Cells
[0106] As noted above, a UE may be configured to initiate beam reporting based on detection of certain events. For trigger-event detection, a UE may monitor RSs to assess if a beam-reporting trigger condition has been met. The following description provides examples of such events.
[0107] A first event (Event-1) may be detected when the quality of a current beam is worse than a certain threshold. A second event (Event-2) may be detected when the quality of at least one new beam, such as L1-RSRP, becomes a threshold value better than the current beam. A third event (Event-3) may be detected when the quality of a new beam is better than a certain threshold. A fourth event (Event-4) may be detected when the quality of the current beam is worse than a first threshold (threshold 1) , and quality of at least one new beam is better than a second threshold (threshold 2) . Various other types of events may also be defined to trigger UE-initiated beam reporting.
[0108] Aspects of the present disclosure provide techniques for extending UE initiated beam reporting to support beam measurements for LTM candidate cells.
[0109] FIG. 8 depicts a call flow diagram 800 for UE initiated beam reporting for LTM candidate cells, in accordance with certain aspects of the present disclosure. In some aspects, the UE shown in FIG. 8 may be an example of the UE 104 depicted and described with respect to FIG. 1 and 3. In some aspects, the network entity shown in FIG. 8 may be an example of the BS 102 (e.g., a gNB) depicted and described with respect to FIG. 1 and 3 or a disaggregated base station depicted and described with respect to FIG. 2.
[0110] As illustrated at 802, a UE may receive and measure RSs (e.g., SSBs) sent on different beams, from a serving cell and one or more candidate cells. As indicated at 804, the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell.
[0111] As illustrated at 806, after detecting at least one event related to the second measurement, the UE may transmit a beam report to the serving cell, the beam report indicates values of at least some of the measurements (e.g., for the serving cell and / or the one or more candidate cells) .
[0112] On UE-initiated / event-driven beam reporting for LTM candidate cells, the following events may be supported. These events may be considered beam-level events as they are based on a condition related to a beam, rather than a condition related to cell (e.g., quality based on measurement of multiple beams in a cell) .
[0113] A first event (Event-1) may be considered as detected when the quality of the current beam in a serving cell is worse than a certain threshold. A second event (Event-2) may be considered as detected when the quality of a new beam in a candidate cell is better than a certain threshold. A variant of the second event (Event-2A) may be considered as detected when the quality of a new beam in any of a serving cell or a candidate cell is better than a certain threshold.
[0114] A third event (Event-3) may be considered as detected when the quality of a new beam in a candidate cell is better than the current beam by an offset. A variant of the third event (Event-3A) may be considered as met when the quality of a new beam in any of a serving cell or a candidate cell is better than the current beam by an offset.
[0115] A fourth event (Event-4) may be considered as met when the quality of the current beam in a serving cell is worse than a first threshold (threshold 1) , and the quality of at least one new beam in a candidate cell is better than a second threshold (threshold 2) . A variant of the fourth event (Event-4A) is considered met when the quality of the current beam in the serving cell is worse than a first threshold (threshold 1) , and quality of at least one new beam in any of a serving cell or a candidate cell is better than a second threshold (threshold 2) .
[0116] For the events described above, the quality of the current beam in the serving cell may be measured as various metrics. According to a first option, the quality may be measured as a quality metric (e.g., L1-RSRP) of a quasi co-located (QCL) RS / root SSB of an indicated transmission configuration indicator (TCI) state in a serving cell (e.g., a Pcell) . According to a second option, the quality may be measured as a quality metric (e.g., L1-RSRP) of a QCL RS / root SSB of the activated best / worst TCI in a serving cell (e.g., Pcell) .
[0117] According to certain aspects, a UE-initiated beam report may be triggered only if one of the beam-level events described above is detected multiple times in a given time period. For example, in such cases, if within a time window (which may be configurable by RRC signaling) , the number of event instance (s) is greater than or equal to a configurable threshold M, the UE may be triggered to transmit the UE initiated beam report for LTM candidate cells.
[0118] For certain beam level events described above (e.g., event-2 / 2A / 3 / 3A / 4 / 4A) , the number of event instance (s) for at least one same new beam may need to be greater than or equal to a configurable threshold M in order to trigger the UE initiated beam reporting for LTM candidate cells.
[0119] The following events for triggering UE-initiated / event-driven beam reporting for LTM candidate cells may be considered cell-level events, as they are based on a condition of a cell, rather than an individual beam.
[0120] A first event (Event-1) may be considered as detected when the quality of the current cell is worse than a certain threshold. A second event (Event-2) may be considered as met when the quality of a new candidate cell is better than a certain threshold. A variant of the second event (Event-2A) may be considered as met when the quality of new beams in any cell of serving or new candidate cell is better than a certain threshold.
[0121] A third event (Event-3) may be considered as detected when the quality of a new candidate cell is better than the current cell by an offset. A fourth event (Event-4) may be considered as detected when the quality of the current cell is worse than a first threshold (threshold 1) , and quality of at least one new candidate cell is better than a second threshold (threshold 2) .
[0122] For the cell-level events described above, the quality of a cell (e.g., serving cell and / or candidate cell) may be based on a cell-level metric.
[0123] According to a first option, the quality of a cell may be based on the cell-level L3 RSRP. According to a second option, the quality of a cell may be based on the cell-level L1 RSRP. In this context, cell-level L1 RSRP may be, for example, an averaged L1-RSRP of top M reported beams in a cell, or the average L1-RSRP of the beams for activated TCIs in a cell. According to a third option, the cell-level L1 RSRP may be measured as the minimum / maximum L1-RSRP of top M reported beams in a cell, or the minimum / maximum L1-RSRP of the beams for activated TCIs in a cell.
[0124] According to certain aspects, a UE-initiated beam report may be triggered only if one of the cell-level events described above is detected multiple times in a given time period. For example, in such cases, if within a time window (which may be configurable by RRC signaling) , the number of event instance (s) is greater than or equal to a configurable threshold M, the UE may be triggered to transmit the UE initiated beam report for LTM candidate cells.
[0125] For certain beam-level events described above (e.g., event-2 / 2A / 3 / 4) , the number of event instance (s) for at least one same new beam may need to be greater than or equal to a configurable threshold M in order to trigger the UE initiated beam reporting for LTM candidate cells.
[0126] There are various options for indicating what new beams should be considered in a UE-initiated / event-driven beam reporting for LTM candidate cells. According to a first option, the new beams may be explicitly provided in a CSI-RS resource set associated with the CSI report configuration. According to a second option, the new beams may be explicitly provided in a dedicated CSI-RS resource set configured via RRC, and a subset may be activated via MAC-CE.
[0127] According to a third option, the new beams may be implicitly formed by the QCL RS / root SSB of the activated TCI states in the serving cell and all the candidate cells. In such cases, a mapping rule may be needed for ordering the RSs in the implicitly derived RS set. For example, the mapping rule may be:
[0128] RS 1 may be a RS from 1st activated TCI in serving cell,
[0129] RS 2 may be a RS from 2nd activated TCI in serving cell,
[0130] …
[0131] RS n_i may be a RS from 1st activated TCI in ith candidate cell,
[0132] RS n_i +1 may be a RS from 2nd activated TCI in ith candidate cell
[0133] …
[0134] On UE-initiated / event-driven beam reporting format for LTM candidate cells, there are also various options for determining the quantity of cells M (up to a maximum value Mmax) and the quantity of beams N (up to a maximum value Nmax) to be reported.
[0135] According to a first option (Option-1) , the report payload may be a variable size. In this case, M cells and N beam (s) per cell may be reported in a report instance, where N is in {1, 2, . . ., Nmax} and M is in {1, 2, . . ., Mmax} . A triggering condition may be cell level, beam level, or both (based on configuration) . For cell level triggering, for example, the M cells should satisfy the condition of the event. For beam level triggering, the M cells and N beam (s) in each of the M cells should satisfy the condition of the event. Nmax and Mmax may be configured by the gNB. In some cases, the indication of the payload size may be provided additionally.
[0136] According to a variation of the first option (Option-1a) with variable payload size, M cells and N beam (s) per cell may be reported in a report instance, where N is in {1, 2, . . ., Nmax} and M is in {1, 2, . . ., Mmax} . According to this option, the triggering condition may be beam level and / or cell level. For beam level triggering, at least one of M cells should satisfy the condition of an event. For cell level, at least one of N reported beam (s) in one of the M cells should satisfy the condition of an event. Nmax and Mmax may be configured by the gNB. The indication of payload size may be provided additionally.
[0137] According to another variation of the first option (Option-1b) with fixed size, M cells and N beam (s) per cell are reported in the report instance, where N is in {1, 2, ..., Nmax} and M is in {1, 2, . . ., Mmax} . For a triggering condition (either or both) : the M cells and N beam (s) in each cell should satisfy the condition of an event. Nmax and Mmax may be configured by the gNB. In this case, payload size may not vary as a function of N, and zero-padding can be provided if N is less than Nmax.
[0138] According to a second option, a fixed payload size may report just one beam (N=1) or one cell (M=1) in a report instance. In this case, a triggering condition may be that the reported beam / cell should satisfy the condition of an event.
[0139] According to a third option, a fixed payload size of M cells and N beam (s) per cell may be reported in the report instance. In this case, a triggering condition may be that at least one of the N reported beam (s) in one of each of the M cells should satisfy the condition of an event. N and M may be configured by the gNB.
[0140] Different types of modes may be supported for UE-initiated / event-driven beam reporting for LTM candidate cells.
[0141] According to a first mode (referred to as Mode A) , UCI for beam reporting may be dynamically scheduling by a serving cell gNB. In a first step, the UE may transmit a first PUCCH (e.g., one-bit / multi-bit) in a serving cell to request a resource for a second UL channel to carry the beam report. In a second step, the UE may detect a DCI format in the serving cell that indicates a resource for the second UL channel to carry the beam report. In a third step, the beam report may be transmitted in the second UL channel in the serving cell.
[0142] According to a second mode (referred to as Mode B) , UCI resources in a serving cell may be pre-configured as a second UL channel for transmitting a beam report. In a first step, the UE may transmits a first PUCCH (one-bit / multi-bit) notifying that a second UL channel in the serving cell is to follow that carries a beam report. In a second step, the UE may transmit the beam report in the second UL channel in the serving cell.
[0143] In either of these modes, the request may be sent, for example, as a scheduling request (SR) or as a new UCI type in a serving cell. In either of these modes, the second UL channel may be, for example, a PUCCH and / or PUSCH in a serving cell.
[0144] In some cases, the UE may receive acknowledge information with response to each step for either of the modes. In some cases, for the procedures described above, cross-CC beam reporting may be supported for both modes.
[0145] Example Operations
[0146] FIG. 9 shows an example of a method 900 of wireless communication at a user equipment (UE) , such as a UE 104 of FIGS. 1 and 3.
[0147] Method 900 begins at step 905 with measuring reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell. In some cases, the operations of this step refer to, or may be performed by, circuitry for measuring and / or code for measuring as described with reference to FIG. 11.
[0148] Method 900 then proceeds to step 910 with detecting at least one event related to the second measurement. In some cases, the operations of this step refer to, or may be performed by, circuitry for detecting and / or code for detecting as described with reference to FIG. 11.
[0149] Method 900 then proceeds to step 915 with generating, after detecting the at least one event, a report that indicates values of at least some of the measurements. In some cases, the operations of this step refer to, or may be performed by, circuitry for generating and / or code for generating as described with reference to FIG. 11.
[0150] Method 900 then proceeds to step 920 with outputting the report. In some cases, the operations of this step refer to, or may be performed by, circuitry for outputting and / or code for outputting as described with reference to FIG. 11.
[0151] In some aspects, the at least one event involves at least one of: a first quality metric associated with the serving cell and based on the first measurement; or a second quality metric associated with the at least one candidate cell and based on the second measurement.
[0152] In some aspects, at least one of the first quality metric or the second quality metric comprises RS received power (RSRP) .
[0153] In some aspects, the RSs comprise RSs quasi co-located (QCL) with synchronous signal blocks (SSBs) associated with at least one of indicated transmission configuration indicator (TCI) states or activated TCI states.
[0154] In some aspects, the at least one event involves at least one of: a first event where the second quality metric is greater than or equal to a first threshold value; a second event where the second quality metric exceeds the first quality metric by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric is greater than or equal to a third threshold value.
[0155] In some aspects, the at least one event involves detecting at least a quantity of at least one of the first event, the second event, or the third event within a time period.
[0156] In some aspects, the method 900 further includes obtaining signaling indicating at least one of the quantity or the time period. In some cases, the operations of this step refer to, or may be performed by, circuitry for obtaining and / or code for obtaining as described with reference to FIG. 11.
[0157] In some aspects, the at least one event comprises at least one of: a first event where the second quality metric associated with any candidate cell is greater than or equal to a first threshold value; a second event where the second quality metric associated with any candidate cell exceeds the first quality metric associated with the serving cell by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric associated with at least one candidate cell is greater than or equal to a third threshold value.
[0158] In some aspects, the detection comprises detecting a quantity of at least one of the first event, the second event, or the third event within a time period.
[0159] In some aspects, the method 900 further includes obtaining signaling indicating at least one of the quantity or the time period. In some cases, the operations of this step refer to, or may be performed by, circuitry for obtaining and / or code for obtaining as described with reference to FIG. 11.
[0160] In some aspects, at least one of the first quality metric or the second quality metric comprises: a layer 3 (L3) RS received power (RSRP) based metric; or a Layer 1 (L1) RSRP based metric.
[0161] In some aspects, at least one of the first quality metric or the second quality metric comprises at least one of: an average of a first quantity of Layer 1 (L1) RS received power (RSRP) based metrics associated with different beams; or a minimum and a maximum of a second quantity of L1 RSRP based metrics associate with different beams.
[0162] In some aspects, at least one of first quantity or the second quantity corresponds to at least one of: a quantity of beams with highest L1 RSRP based metrics; or a quantity of beams associated with activated transmission configuration indicator (TCI) states.
[0163] In some aspects, the values correspond to beams that are, at least one of: indicated in a resource set associated with a report configuration; indicated in a resource set being at least one of configured via radio resource configuration (RRC) or activated via a medium access control (MAC) control element (CE) ; or indicated via a mapping rule and either a quasi co-located (QCL) reference signal (RS) or root synchronization signal block (SSB) associated with one or more activated transmission configuration indicator (TCI) states.
[0164] In some aspects, at least one of: the report has a variable size that depends on a quantity of cells and a quantity of beams with corresponding values indicated in the report; or at least one of the quantity of cells or the quantity of beams depends on a quantity of the measurements satisfying one or more conditions associated with the at least one event.
[0165] In some aspects, the report has a fixed size corresponding to a fixed quantity of cells and a fixed quantity of beams.
[0166] In some aspects, the report includes zero padding if a quantity of the measurements satisfying one or more conditions of the at least one event is less than a product of the fixed quantity of cells and the fixed quantity of beams.
[0167] In some aspects, the report is output for transmission in the serving cell and via dynamically scheduled or preconfigured uplink control information (UCI) resources.
[0168] In one aspect, method 900, or any aspect related to it, may be performed by an apparatus, such as communications device 1100 of FIG. 11, which includes various components operable, configured, or adapted to perform the method 900. Communications device 1100 is described below in further detail.
[0169] Note that FIG. 9 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.
[0170] FIG. 10 shows an example of a method 1000 of wireless communication at a network entity, such as a BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.
[0171] Method 1000 begins at step 1005 with outputting signaling configuring a user equipment (UE) to measure reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell, and to report at least some of the measurements based on detection of at least one event related to the second measurement. In some cases, the operations of this step refer to, or may be performed by, circuitry for outputting and / or code for outputting as described with reference to FIG. 11.
[0172] Method 1000 then proceeds to step 1010 with obtaining, from the UE, a report that indicates values of at least some of the measurements. In some cases, the operations of this step refer to, or may be performed by, circuitry for obtaining and / or code for obtaining as described with reference to FIG. 11.
[0173] In some aspects, the at least one event involves at least one of: a first quality metric associated with the serving cell and based on the first measurement; or a second quality metric associated with the at least one candidate cell and based on the second measurement.
[0174] In some aspects, at least one of the first quality metric or the second quality metric comprises RS received power (RSRP) .
[0175] In some aspects, the RSs comprise RSs quasi co-located (QCL) with synchronous signal blocks (SSBs) associated with at least one of indicated transmission configuration indicator (TCI) states or activated TCI states.
[0176] In some aspects, the at least one event involves at least one of: a first event where the second quality metric is greater than or equal to a first threshold value; a second event where the second quality metric exceeds the first quality metric by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric is greater than or equal to a third threshold value.
[0177] In some aspects, the at least one event involves detecting at least a quantity of at least one of the first event, the second event, or the third event within a time period.
[0178] In some aspects, the signaling indicates at least one of the quantity or the time period.
[0179] In some aspects, the at least one event comprises at least one of: a first event where the second quality metric associated with any candidate cell is greater than or equal to a first threshold value; a second event where the second quality metric associated with any candidate cell exceeds the first quality metric associated with the serving cell by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric associated with at least one candidate cell is greater than or equal to a third threshold value.
[0180] In some aspects, the detection comprises detecting a quantity of at least one of the first event, the second event, or the third event within a time period.
[0181] In some aspects, the signaling indicates at least one of the quantity or the time period.
[0182] In some aspects, at least one of the first quality metric or the second quality metric comprises: a layer 3 (L3) RS received power (RSRP) based metric; or a Layer 1 (L1) RSRP based metric.
[0183] In some aspects, at least one of the first quality metric or the second quality metric comprises at least one of: an average of a first quantity of Layer 1 (L1) RS received power (RSRP) based metrics associated with different beams; or a minimum and a maximum of a second quantity of L1 RSRP based metrics associate with different beams.
[0184] In some aspects, at least one of first quantity or the second quantity corresponds to at least one of: a quantity of beams with highest L1 RSRP based metrics; or a quantity of beams associated with activated transmission configuration indicator (TCI) states.
[0185] In some aspects, the values correspond to beams that are, at least one of: indicated in a resource set associated with a report configuration; indicated in a resource set being at least one of configured via radio resource configuration (RRC) or activated via a medium access control (MAC) control element (CE) ; or indicated via a mapping rule and either a quasi co-located (QCL) reference signal (RS) or root synchronization signal block (SSB) associated with one or more activated transmission configuration indicator (TCI) states.
[0186] In some aspects, at least one of: the report has a variable size that depends on a quantity of cells and a quantity of beams with corresponding values indicated in the report; or at least one of the quantity of cells or the quantity of beams depends on a quantity of the measurements satisfying one or more conditions associated with the at least one event.
[0187] In some aspects, the report has a fixed size corresponding to a fixed quantity of cells and a fixed quantity of beams.
[0188] In some aspects, the report includes zero padding if a quantity of the measurements satisfying one or more conditions of the at least one event is less than a product of the fixed quantity of cells and the fixed quantity of beams.
[0189] In some aspects, the report is output for transmission in the serving cell and via dynamically scheduled or preconfigured uplink control information (UCI) resources.
[0190] In one aspect, method 1000, or any aspect related to it, may be performed by an apparatus, such as communications device 1100 of FIG. 11, which includes various components operable, configured, or adapted to perform the method 1000. Communications device 1100 is described below in further detail.
[0191] Note that FIG. 10 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.
[0192] Example Communications Device (s)
[0193] FIG. 11 depicts aspects of an example communications device 1100. In some aspects, communications device 1100 is a user equipment, such as UE 104 described above with respect to FIGS. 1 and 3. In some aspects, communications device 1100 is a network entity, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.
[0194] The communications device 1100 includes a processing system 1105 coupled to the transceiver 1175 (e.g., a transmitter and / or a receiver) . In some aspects (e.g., when communications device 1100 is a network entity) , processing system 1105 may be coupled to a network interface 1185 that is configured to obtain and send signals for the communications device 1100 via communication link (s) , such as a backhaul link, midhaul link, and / or fronthaul link as described herein, such as with respect to FIG. 2. The transceiver 1175 is configured to transmit and receive signals for the communications device 1100 via the antenna 1180, such as the various signals as described herein. The processing system 1105 may be configured to perform processing functions for the communications device 1100, including processing signals received and / or to be transmitted by the communications device 1100.
[0195] The processing system 1105 includes one or more processors 1110. In various aspects, the one or more processors 1110 may be representative of one or more of receive processor 358, transmit processor 364, TX MIMO processor 366, and / or controller / processor 380, as described with respect to FIG. 3. In various aspects, one or more processors 1110 may be representative of one or more of receive processor 338, transmit processor 320, TX MIMO processor 330, and / or controller / processor 340, as described with respect to FIG. 3. The one or more processors 1110 are coupled to a computer-readable medium / memory 1140 via a bus 1170. In certain aspects, the computer-readable medium / memory 1140 is configured to store instructions (e.g., computer-executable code) that when executed by the one or more processors 1110, cause the one or more processors 1110 to perform the method 900 described with respect to FIG. 9, or any aspect related to it; and the method 1000 described with respect to FIG. 10, or any aspect related to it. Note that reference to a processor performing a function of communications device 1100 may include one or more processors 1110 performing that function of communications device 1100.
[0196] In the depicted example, computer-readable medium / memory 1140 stores code (e.g., executable instructions) , such as code for measuring 1145, code for detecting 1150, code for generating 1155, code for outputting 1160, and code for obtaining 1165. Processing of the code for measuring 1145, code for detecting 1150, code for generating 1155, code for outputting 1160, and code for obtaining 1165 may cause the communications device 1100 to perform the method 900 described with respect to FIG. 9, or any aspect related to it; and the method 1000 described with respect to FIG. 10, or any aspect related to it.
[0197] The one or more processors 1110 include circuitry configured to implement (e.g., execute) the code stored in the computer-readable medium / memory 1140, including circuitry for measuring 1115, circuitry for detecting 1120, circuitry for generating 1125, circuitry for outputting 1130, and circuitry for obtaining 1135. Processing with circuitry for measuring 1115, circuitry for detecting 1120, circuitry for generating 1125, circuitry for outputting 1130, and circuitry for obtaining 1135 may cause the communications device 1100 to perform the method 900 described with respect to FIG. 9, or any aspect related to it; and the method 1000 described with respect to FIG. 10, or any aspect related to it.
[0198] Various components of the communications device 1100 may provide means for performing the method 900 described with respect to FIG. 9, or any aspect related to it;and the method 1000 described with respect to FIG. 10, or any aspect related to it. For example, means for transmitting, sending or outputting for transmission may include transceivers 354 and / or antenna (s) 352 of the UE 104 illustrated in FIG. 3, transceivers 332 and / or antenna (s) 334 of the BS 102 illustrated in FIG. 3, and / or the transceiver 1175 and the antenna 1180 of the communications device 1100 in FIG. 11. Means for receiving or obtaining may include transceivers 354 and / or antenna (s) 352 of the UE 104 illustrated in FIG. 3, transceivers 332 and / or antenna (s) 334 of the BS 102 illustrated in FIG. 3, and / or the transceiver 1175 and the antenna 1180 of the communications device 1100 in FIG. 11.
[0199] Example Clauses
[0200] Implementation examples are described in the following numbered clauses:
[0201] Clause 1: A method for wireless communication at a wireless node, comprising: measuring reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell; detecting at least one event related to the second measurement; generating, after detecting the at least one event, a report that indicates values of at least some of the measurements; and outputting the report.
[0202] Clause 2: The method of Clause 1, wherein the at least one event involves at least one of: a first quality metric associated with the serving cell and based on the first measurement; or a second quality metric associated with the at least one candidate cell and based on the second measurement.
[0203] Clause 3: The method of Clause 2, wherein at least one of the first quality metric or the second quality metric comprises RS received power (RSRP) .
[0204] Clause 4: The method of Clause 2, wherein the RSs comprise RSs quasi co-located (QCL) with synchronous signal blocks (SSBs) associated with at least one of indicated transmission configuration indicator (TCI) states or activated TCI states.
[0205] Clause 5: The method of Clause 2, wherein the at least one event involves at least one of: a first event where the second quality metric is greater than or equal to a first threshold value; a second event where the second quality metric exceeds the first quality metric by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric is greater than or equal to a third threshold value.
[0206] Clause 6: The method of Clause 5, wherein the at least one event involves detecting at least a quantity of at least one of the first event, the second event, or the third event within a time period.
[0207] Clause 7: The method of Clause 6, further comprising: obtaining signaling indicating at least one of the quantity or the time period.
[0208] Clause 8: The method of Clause 2, wherein the at least one event comprises at least one of: a first event where the second quality metric associated with any candidate cell is greater than or equal to a first threshold value; a second event where the second quality metric associated with any candidate cell exceeds the first quality metric associated with the serving cell by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric associated with at least one candidate cell is greater than or equal to a third threshold value.
[0209] Clause 9: The method of Clause 8, wherein the detection comprises detecting a quantity of at least one of the first event, the second event, or the third event within a time period.
[0210] Clause 10: The method of Clause 9, further comprising: obtaining signaling indicating at least one of the quantity or the time period.
[0211] Clause 11: The method of Clause 2, wherein at least one of the first quality metric or the second quality metric comprises: a layer 3 (L3) RS received power (RSRP) based metric; or a Layer 1 (L1) RSRP based metric.
[0212] Clause 12: The method of Clause 2, wherein at least one of the first quality metric or the second quality metric comprises at least one of: an average of a first quantity of Layer 1 (L1) RS received power (RSRP) based metrics associated with different beams; or a minimum and a maximum of a second quantity of L1 RSRP based metrics associate with different beams.
[0213] Clause 13: The method of Clause 12, wherein at least one of first quantity or the second quantity corresponds to at least one of: a quantity of beams with highest L1 RSRP based metrics; or a quantity of beams associated with activated transmission configuration indicator (TCI) states.
[0214] Clause 14: The method of any one of Clauses 1-13, wherein the values correspond to beams that are, at least one of: indicated in a resource set associated with a report configuration; indicated in a resource set being at least one of configured via radio resource configuration (RRC) or activated via a medium access control (MAC) control element (CE) ; or indicated via a mapping rule and either a quasi co-located (QCL) reference signal (RS) or root synchronization signal block (SSB) associated with one or more activated transmission configuration indicator (TCI) states.
[0215] Clause 15: The method of any one of Clauses 1-14, wherein at least one of: the report has a variable size that depends on a quantity of cells and a quantity of beams with corresponding values indicated in the report; or at least one of the quantity of cells or the quantity of beams depends on a quantity of the measurements satisfying one or more conditions associated with the at least one event.
[0216] Clause 16: The method of any one of Clauses 1-15, wherein the report has a fixed size corresponding to a fixed quantity of cells and a fixed quantity of beams.
[0217] Clause 17: The method of Clause 16, wherein the report includes zero padding if a quantity of the measurements satisfying one or more conditions of the at least one event is less than a product of the fixed quantity of cells and the fixed quantity of beams.
[0218] Clause 18: The method of any one of Clauses 1-17, wherein the report is output for transmission in the serving cell and via dynamically scheduled or preconfigured uplink control information (UCI) resources.
[0219] Clause 19: A method for wireless communication at a wireless node, comprising: outputting signaling configuring a user equipment (UE) to measure reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell, and to report at least some of the measurements based on detection of at least one event related to the second measurement; and obtaining, from the UE, a report that indicates values of at least some of the measurements.
[0220] Clause 20: The method of Clause 19, wherein the at least one event involves at least one of: a first quality metric associated with the serving cell and based on the first measurement; or a second quality metric associated with the at least one candidate cell and based on the second measurement.
[0221] Clause 21: The method of Clause 20, wherein at least one of the first quality metric or the second quality metric comprises RS received power (RSRP) .
[0222] Clause 22: The method of Clause 20, wherein the RSs comprise RSs quasi co-located (QCL) with synchronous signal blocks (SSBs) associated with at least one of indicated transmission configuration indicator (TCI) states or activated TCI states.
[0223] Clause 23: The method of Clause 20, wherein the at least one event involves at least one of: a first event where the second quality metric is greater than or equal to a first threshold value; a second event where the second quality metric exceeds the first quality metric by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric is greater than or equal to a third threshold value.
[0224] Clause 24: The method of Clause 23, wherein the at least one event involves detecting at least a quantity of at least one of the first event, the second event, or the third event within a time period.
[0225] Clause 25: The method of Clause 24, wherein the signaling indicates at least one of the quantity or the time period.
[0226] Clause 26: The method of Clause 20, wherein the at least one event comprises at least one of: a first event where the second quality metric associated with any candidate cell is greater than or equal to a first threshold value; a second event where the second quality metric associated with any candidate cell exceeds the first quality metric associated with the serving cell by at least an offset value; or a third event where the first quality metric is less than or equal to a second threshold value and the second quality metric associated with at least one candidate cell is greater than or equal to a third threshold value.
[0227] Clause 27: The method of Clause 26, wherein the detection comprises detecting a quantity of at least one of the first event, the second event, or the third event within a time period.
[0228] Clause 28: The method of Clause 27, further wherein the signaling indicates at least one of the quantity or the time period.
[0229] Clause 29: The method of Clause 20, wherein at least one of the first quality metric or the second quality metric comprises: a layer 3 (L3) RS received power (RSRP) based metric; or a Layer 1 (L1) RSRP based metric.
[0230] Clause 30: The method of Clause 20, wherein at least one of the first quality metric or the second quality metric comprises at least one of: an average of a first quantity of Layer 1 (L1) RS received power (RSRP) based metrics associated with different beams; or a minimum and a maximum of a second quantity of L1 RSRP based metrics associate with different beams.
[0231] Clause 31: The method of Clause 30, wherein at least one of first quantity or the second quantity corresponds to at least one of: a quantity of beams with highest L1 RSRP based metrics; or a quantity of beams associated with activated transmission configuration indicator (TCI) states.
[0232] Clause 32: The method of any one of Clauses 19-31, wherein the values correspond to beams that are, at least one of: indicated in a resource set associated with a report configuration; indicated in a resource set being at least one of configured via radio resource configuration (RRC) or activated via a medium access control (MAC) control element (CE) ; or indicated via a mapping rule and either a quasi co-located (QCL) reference signal (RS) or root synchronization signal block (SSB) associated with one or more activated transmission configuration indicator (TCI) states.
[0233] Clause 33: The method of any one of Clauses 19-32, wherein at least one of: the report has a variable size that depends on a quantity of cells and a quantity of beams with corresponding values indicated in the report; or at least one of the quantity of cells or the quantity of beams depends on a quantity of the measurements satisfying one or more conditions associated with the at least one event.
[0234] Clause 34: The method of any one of Clauses 19-33, wherein the report has a fixed size corresponding to a fixed quantity of cells and a fixed quantity of beams.
[0235] Clause 35: The method of Clause 34, wherein the report includes zero padding if a quantity of the measurements satisfying one or more conditions of the at least one event is less than a product of the fixed quantity of cells and the fixed quantity of beams.
[0236] Clause 36: The method of any one of Clauses 19-35, wherein the report is output for transmission in the serving cell and via dynamically scheduled or preconfigured uplink control information (UCI) resources.
[0237] Clause 37: An apparatus, comprising: at least one memory comprising executable instructions; and at least one processor configured to execute the executable instructions and cause the apparatus to perform a method in accordance with any combination of Clauses 1-36.
[0238] Clause 38: An apparatus, comprising means for performing a method in accordance with any combination of Clauses 1-36.
[0239] Clause 39: A non-transitory computer-readable medium comprising executable instructions that, when executed by at least one processor of an apparatus, cause the apparatus to perform a method in accordance with any combination of Clauses 1-36.
[0240] Clause 40: A computer program product embodied on a computer-readable storage medium comprising code for performing a method in accordance with any combination of Clauses 1-36.
[0241] Clause 41: A wireless node (e.g., a user equipment (UE) ) , comprising: at least one transceiver; at least one memory comprising instructions; and one or more processors, individually or collectively, configured to execute the instructions and cause the wireless node to perform a method in accordance with any one of clauses 1-18, wherein the at least one transceiver is configured to transmit the report.
[0242] Clause 42: A wireless node (e.g., a network entity) , comprising: at least one transceiver; at least one memory comprising instructions; and one or more processors, individually or collectively, configured to execute the instructions and cause the wireless node to perform a method in accordance with any one of clauses 19-36, wherein the at least one transceiver is configured to receive the report.
[0243] Additional Considerations
[0244] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limiting of the scope, applicability, or aspects set forth in the claims. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various actions may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.
[0245] The various illustrative logical blocks, modules and circuits described in connection with the present disclosure may be implemented or performed with a general purpose processor, a graphics processing unit (GPU) , a neural processing unit (NPU) , a digital signal processor (DSP) , an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD) , discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC) , or any other such configuration.
[0246] As used herein, “aprocessor, ” “at least one processor” or “one or more processors” generally refers to a single processor configured to perform one or multiple operations or multiple processors configured to collectively perform one or more operations. In the case of multiple processors, performance of the one or more operations could be divided amongst different processors, though one processor may perform multiple operations, and multiple processors could collectively perform a single operation. Similarly, “amemory, ” “at least one memory” or “one or more memories” generally refers to a single memory configured to store data and / or instructions, multiple memories configured to collectively store data and / or instructions.
[0247] In some cases, rather than actually transmitting a signal, an apparatus (e.g., a wireless node or device) may have an interface to output the signal for transmission. For example, a processor may output a signal, via a bus interface, to a radio frequency (RF) front end for transmission. Accordingly, a means for outputting may include such an interface as an alternative (or in addition) to a transmitter or transceiver. Similarly, rather than actually receiving a signal, an apparatus (e.g., a wireless node or device) may have an interface to obtain a signal from another device. For example, a processor may obtain (or receive) a signal, via a bus interface, from an RF front end for reception. Accordingly, a means for obtaining may include such an interface as an alternative (or in addition) to a receiver or transceiver.
[0248] While the present disclosure may describe certain operations as being performed by one type of wireless node, the same or similar operations may also be performed by another type of wireless node. For example, operations performed by a user equipment (UE) may also (or instead) be performed by a network entity (e.g., a base station or unit of a disaggregated base station) . Similarly, operations performed by a network entity may also (or instead) be performed by a UE.
[0249] Further, while the present disclosure may describe certain types of communications between different types of wireless nodes (e.g., between a network entity and a UE) , the same or similar types of communications may occur between same types of wireless nodes (e.g., between network entities or between UEs, in a peer-to-peer scenario) . Further, communications may occur in reverse order than described.
[0250] Means for measuring, means for detecting, means for generating, means for outputting, and means for obtaining may comprise one or more processors, such as one or more of the processors described above with reference to FIG. 11.
[0251] As used herein, a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of:a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
[0252] As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
[0253] The methods disclosed herein comprise one or more actions for achieving the methods. The method actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of actions is specified, the order and / or use of specific actions may be modified without departing from the scope of the claims. Further, the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and / or software component (s) and / or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor. 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, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
[0254] The following claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims. Within a claim, reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more. ” Unless specifically stated otherwise, the term “some” refers to one or more. No claim element is to be construed under the provisions of 35 U.S.C. §112 (f) unless the element is expressly recited using the phrase “means for” . All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.
Claims
1.An apparatus for wireless communication, comprising:at least one memory comprising computer-executable instructions; andone or more processors configured to execute the computer-executable instructions and cause the apparatus to:measure reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell;detect at least one event related to the second measurement;generate, after detecting the at least one event, a report that indicates values of at least some of the measurements; andoutput the report.2.The apparatus of claim 1, wherein the at least one event involves at least one of:a first quality metric associated with the serving cell and based on the first measurement; ora second quality metric associated with the at least one candidate cell and based on the second measurement.3.The apparatus of claim 2, wherein at least one of the first quality metric or the second quality metric comprises RS received power (RSRP) .4.The apparatus of claim 2, wherein the RSs comprise RSs quasi co-located (QCL) with synchronous signal blocks (SSBs) associated with at least one of indicated transmission configuration indicator (TCI) states or activated TCI states.5.The apparatus of claim 2, wherein the at least one event involves at least one of:a first event where the second quality metric is greater than or equal to a first threshold value;a second event where the second quality metric exceeds the first quality metric by at least an offset value; ora third event where the first quality metric is less than or equal to a second threshold value and the second quality metric is greater than or equal to a third threshold value.6.The apparatus of claim 5, wherein the at least one event involves detection of at least a quantity of at least one of the first event, the second event, or the third event within a time period.7.The apparatus of claim 6, wherein the one or more processors are further configured to cause the apparatus to:obtain signaling indicating at least one of the quantity or the time period.8.The apparatus of claim 2, wherein the at least one event comprises at least one of:a first event where the second quality metric associated with any candidate cell is greater than or equal to a first threshold value;a second event where the second quality metric associated with any candidate cell exceeds the first quality metric associated with the serving cell by at least an offset value; ora third event where the first quality metric is less than or equal to a second threshold value and the second quality metric associated with at least one candidate cell is greater than or equal to a third threshold value.9.The apparatus of claim 8, wherein the detection comprises detection of a quantity of at least one of the first event, the second event, or the third event within a time period.10.The apparatus of claim 9, wherein the one or more processors are further configured to cause the apparatus to:obtain signaling indicating at least one of the quantity or the time period.11.The apparatus of claim 2, wherein at least one of the first quality metric or the second quality metric comprises:a layer 3 (L3) RS received power (RSRP) based metric; ora Layer 1 (L1) RSRP based metric.12.The apparatus of claim 2, wherein at least one of the first quality metric or the second quality metric comprises at least one of:an average of a first quantity of Layer 1 (L1) RS received power (RSRP) based metrics associated with different beams; ora minimum and a maximum of a second quantity of L1 RSRP based metrics associate with different beams.13.The apparatus of claim 12, wherein at least one of first quantity or the second quantity corresponds to at least one of:a quantity of beams with highest L1 RSRP based metrics; ora quantity of beams associated with activated transmission configuration indicator (TCI) states.14.The apparatus of claim 1, wherein the values correspond to beams that are, at least one of:indicated in a resource set associated with a report configuration;indicated in a resource set being at least one of configured via radio resource configuration (RRC) or activated via a medium access control (MAC) control element (CE) ; orindicated via a mapping rule and either a quasi co-located (QCL) reference signal (RS) or root synchronization signal block (SSB) associated with one or more activated transmission configuration indicator (TCI) states.15.The apparatus of claim 1, wherein at least one of:the report has a variable size that depends on a quantity of cells and a quantity of beams with corresponding values indicated in the report; orat least one of the quantity of cells or the quantity of beams depends on a quantity of the measurements satisfying one or more conditions associated with the at least one event.16.The apparatus of claim 1, wherein:the report has a fixed size corresponding to a fixed quantity of cells and a fixed quantity of beams, andthe report includes zero padding if a quantity of the measurements satisfying one or more conditions of the at least one event is less than a product of the fixed quantity of cells and the fixed quantity of beams.17.The apparatus of claim 1, wherein the report is output for transmission in the serving cell and via dynamically scheduled or preconfigured uplink control information (UCI) resources.18.The apparatus of claim 1, further comprising at least one transceiver configured to transmit the report, wherein the apparatus is configured as a user equipment (UE) .19.An apparatus for wireless communication, comprising:at least one memory comprising computer-executable instructions; andone or more processors configured to execute the computer-executable instructions and cause the apparatus to:output signaling configuring a wireless node to measure reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell, and to report at least some of the measurements based on detection of at least one event related to the second measurement; andobtain, from the wireless node, a report that indicates values of at least some of the measurements.20.A method for wireless communication at a wireless node, comprising:measuring reference signals (RSs) , wherein the measurements include a first measurement of at least one first RS associated with a first beam and a serving cell and a second measurement of at least one second RS associated with at least one second beam and at least one candidate cell;detecting at least one event related to the second measurement;generating, after detecting the at least one event, a report that indicates values of at least some of the measurements; andoutputting the report.
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