Beam reporting using a medium access control-control element
Event-triggered beam reporting using MAC-CEs addresses latency issues in wireless communication systems by enabling efficient transmission of signal strength values, enhancing mobility procedure efficiency.
Patent Information
- Application Number
- PCT/CN2025/083742
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-01-29
AI Technical Summary
Existing wireless communication systems face latency issues in beam reporting due to the rigid structure of MAC-CEs, making it difficult to efficiently pack beam measurement information.
Implement event-triggered beam reporting using MAC-CEs, where UEs generate a MAC-CE indicating absolute and differential signal strength values based on configured trigger conditions, allowing efficient transmission of beam reports.
Reduces latency in beam reporting by enabling efficient communication of beam measurement information through MAC-CEs, facilitating timely mobility procedures.
Smart Images

Figure CN2025083742_29012026_PF_FP_ABST
Abstract
Description
BEAM REPORTING USING A MEDIUM ACCESS CONTROL-CONTROL ELEMENTTECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to beam reporting using a medium access control-control element (MAC-CE) .BACKGROUND
[0002] A wireless communications system may include one or multiple network communication devices, which may be otherwise known as network equipment (NE) , supporting wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like) ) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .SUMMARY
[0003] An article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ” Further, as used herein, including in the claims, a “set” may include one or more elements.
[0004] A UE for wireless communication is described. The UE may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the UE may be configured to, capable of, or operable to receive a configuration for event-triggered beam reporting, obtain a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells, and generate, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.
[0005] A processor (e.g., a standalone processor chipset, or a component of a UE) for wireless communication is described. The processor may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the processor may be configured to, capable of, or operable to receive a configuration for event-triggered beam reporting, obtain a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells, and generate, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.
[0006] A method performed or performable by a UE for wireless communication is described. The method may include receiving a configuration for event-triggered beam reporting, obtaining a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells, and generating, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.
[0007] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may further be configured to, capable of, operable to transmit a report including the MAC-CE in accordance with the received configuration for the event-triggered beam reporting.
[0008] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may further be configured to, capable of, operable to transmit the report based on expiration of a timer, where the timer is configured via the received configuration for the event-triggered beam reporting.
[0009] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may further be configured to, capable of, operable to determine a change of the at least one signal strength value between a first time and a second time, where the MAC-CE indicates that absolute value of the at least one signal strength value based on the change of the at least one signal strength value between the first time and the second time satisfying a threshold, and where the threshold is indicated in the received configuration for the event-triggered beam reporting. In some implementations, the MAC-CE further indicates a differential value of a second signal strength value of a corresponding beam of a respective cell of the set of cells with respect to the absolute value of the at least one signal strength value.
[0010] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may further be configured to, capable of, operable to determine, based on the set of signal strength values, a subset of the set of signal strength values meet a trigger condition for the event-triggered beam reporting, where the UE generates the MAC-CE based on the subset of the set of signal strength values meeting the trigger condition.
[0011] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may further be configured to, capable of, operable to determine multiple signal strength values meet the trigger condition, where the at least one signal strength value includes a highest signal strength value among the multiple signal strength values.
[0012] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may further be configured to, capable of, operable to receive an uplink grant that indicates a quantity of resources for transmission of the MAC-CE and truncate the MAC-CE based on the quantity of resources being less than a quantity of resources for transmission of the MAC-CE.
[0013] In some implementations of the UE, the processor, and the method described herein, the UE, the processor, and the method may further be configured to, capable of, operable to adjust a payload of the MAC-CE by removing one or more signal strength values from the MAC-CE, where the one or more removed signal strength values do not meet a trigger condition. In some implementations, the at least one signal strength value includes a highest signal strength value among the obtained set of signal strength values.
[0014] An NE (e.g., a base station) for wireless communication is described. The NE may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the NE may be configured to, capable of, or operable to transmit a configuration for event-triggered beam reporting and receive, based on the configuration for the event-triggered beam reporting, a report including a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.
[0015] A processor (e.g., a standalone processor chipset, or a component of a NE) for wireless communication is described. The processor may be configured to, capable of, or operable to perform one or more operations as described herein. For example, the processor may be configured to, capable of, or operable to transmit a configuration for event-triggered beam reporting and receive, based on the configuration for the event-triggered beam reporting, a report including a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.
[0016] A method performed or performable by an NE (e.g., a base station) for wireless communication is described. The method may include transmitting a configuration for event-triggered beam reporting and receiving, based on the configuration for the event-triggered beam reporting, a report including a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.
[0017] In some implementations of the NE, the processor, and the method described herein, the NE, the processor, and the method may further be configured to, capable of, operable to receive the report based on expiration of a timer, where the timer is configured via the received configuration for the event-triggered beam reporting.
[0018] In some implementations, the configuration for the event-triggered beam reporting indicates a threshold change the at least one signal strength value satisfies to be reported. In some implementations, the MAC-CE further indicates a differential value of a second signal strength value of a corresponding beam of a respective cell of the set of cells with respect to the absolute value of the at least one signal strength value.BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.
[0020] Figure 2 illustrates an example of a wireless communications system in accordance with aspects of the present disclosure.
[0021] Figure 3 illustrates an example of a MAC-CE format in accordance with aspects of the present disclosure.
[0022] Figure 4 illustrates an example of a graph in accordance with aspects of the present disclosure.
[0023] Figure 5 illustrates an example of a UE in accordance with aspects of the present disclosure.
[0024] Figure 6 illustrates an example of a processor in accordance with aspects of the present disclosure.
[0025] Figure 7 illustrates an example of an NE in accordance with aspects of the present disclosure.
[0026] Figure 8 illustrates an example of a flowchart of a method performed by a UE in accordance with aspects of the present disclosure.
[0027] Figure 9 illustrates an example of a flowchart of a method performed by an NE in accordance with aspects of the present disclosure.
[0028] Figure 10 illustrates an example of a process flow in accordance with aspects of the present disclosure.DETAILED DESCRIPTION
[0029] Devices of a wireless communication system may support operations that rely on beam reporting. For example, a UE and a NE may perform a mobility procedure to switch a serving cell of the UE. To initiate the mobility procedure, the UE may send a measurement report to the NE that includes signal strength measurements of beams corresponding to the serving cell and other candidate cells of the UE. Using the measurement report, the NE may determine to switch the serving cell of the UE. In some examples, the UE may transmit the measurement report to the NE using radio resource control (RRC) signaling. RRC signaling may be associated with more latency when compared to other lower layer signaling such as a MAC-CE. But using MAC-CEs for measurement reporting may be difficult because MAC-CEs have a rigid structure which make packing the MAC-CE with beam measurement information difficult.
[0030] The methods as described herein provide for efficient beam reporting using MAC-CEs. The UE may receive, from the NE, a configuration for event-triggered beam reporting. Upon receiving the configuration, the UE may obtain a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on the measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells and based on the obtained set of signal strength values, generate a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cells of the set of cells (e.g., a highest signal strength value of the obtained signal strength values) . Optionally, the MAC-CE may also indicate a differential value of a second signal strength value of a corresponding beam of a respective cell of the set of cells with respect to the absolute value of the at least one signal strength value. Upon generating the MAC-CE, the UE may transmit, to the NE, a report that includes the MAC-CE. In some examples, based on the report, the NE may decide to switch a serving cell of the UE and initiate a mobility procedure. It should be understood that various terms may be used interchangeably with “communicating, ” such as “signaling, ” “transmitting, ” “receiving, ” “outputting, ” “forwarding, ” “relaying, ” “retrieving, ” “obtaining, ” and so forth.
[0031] By performing the described techniques, the UE and the NE may reduce latency associated with beam reporting in a wireless communications system when compared to other techniques.
[0032] Aspects of the present disclosure are described in the context of a wireless communications system. Additional aspects of the present disclosure are described in the context of a graphs, a MAC-CE format, component diagrams, a process flow, method flows, etc.
[0033] Figure 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more NEs 102, one or more UEs 104, and a core network (CN) 106. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a NR network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0034] The one or more NEs 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the NEs 102 described herein may be or include or may be referred to as a network node, a base station, an access point (AP) , a network element, a network function, a network entity, a radio access network (RAN) , a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
[0035] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN) . In some implementations, different geographic coverage areas associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NE 102.
[0036] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
[0037] A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
[0038] An NE 102 may support communications with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g., S1, N2, N6, or other network interface) . In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other indirectly (e.g., via the CN 106) . In some implementations, one or more NEs 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs) .
[0039] In some implementations, a NE 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more NEs 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a NE 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN Intelligent Controller (RIC) (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, or any combination thereof.
[0040] An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the NE 102 in a disaggregated RAN architecture may be co-located, or one or more components of the NEs 102 may be located in distributed locations (e.g., separate physical locations) . In some implementations, one or more NEs 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU) ) .
[0041] Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU. For example, a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack. In some implementations, the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU.
[0042] Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or multiple different cells (e.g., via one or more RUs) . In some implementations, a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
[0043] A CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u) , and a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface) . In some implementations, a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective NEs 102 that are in communication via such communication links.
[0044] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a packet data network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more NEs 102 associated with the CN 106.
[0045] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an S1, N2, N6, or other network interface) . The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106) .
[0046] In the wireless communications system 100, the NEs 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0047] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
[0048] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0049] Additionally, or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
[0050] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0051] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
[0052] In some examples, devices (e.g., the UE 104 and the NE 102) of the wireless communications system 100 may perform an L1 / L2 triggered mobility (LTM) procedure to switch a serving cell of the UE 104. As a first step, the UE 104 (e.g., while operating in an RRC_connected state) may transmit a measurement report message (or MeasurementReport) to the NE 102. Based on the measurement report, the NE 102 may decide to configure LTM and initiate the LTM procedure. As a second step, the NE 102 may transmit an RRC reconfiguration message (or RRCReconfiguration) to the UE 104 that includes LTM candidate configurations. As a third step, the UE 104 may store the LTM configurations and transmit an RRC reconfiguration complete message (or RRCReconfigurationComplete) to the NE 102. As a fourth step, the UE 104 may perform downlink synchronization and uplink synchronization with LTM candidate cells. In some examples, the UE 104 may perform the uplink synchronization with LTM candidate cells using UE-based TA measurement and / or by transmitting a preamble towards an LTM candidate cell in response to a physical downlink control channel (PDCCH) order from a source cell.
[0053] In some examples, it may be possible to activate transmission configuration indicator (TCI) states of one or multiple cells that are different from the serving cell of the UE 104. For instance, TCI states of the LTM candidate cells can be activated in advance of the LTM candidate cells becoming serving cells. This allows the UE to be perform downlink synchronization with the LTM candidate cells.
[0054] In some examples, it is possible to initiate an early uplink TA acquisition (or early TA) procedure for one or multiple cells that are different from the serving cell of the UE 104 (e.g., candidate LTM cells) . Early TA may be triggered by a PDCCH order or realized through UE-based TA measurement as configured by RRC. For the former, the NE 102 to which an LTM candidate cell belongs to may calculate a TA value and send it to the NE 102 to which the serving cell belongs to. The TA value is then later sent in an LTM cell switch command as described below. For the latter, the UE performs TA measurement for the LTM candidate cells after being configured by RRC. The time at which the UE 104 performs the measurements is up to UE implementation.
[0055] As a fifth step, the UE 104 may perform L1 measurements on the LTM candidate cells and transmit an L1 measurement report to the NE 102. As a sixth step, the NE 102 may decide to execute a cell switch from the source cell to a target cell and transmit an LTM cell switch command via a MAC-CE to the UE 104. The LTM cell switch command includes a target configuration ID which indicates an index of the LTM candidate configuration of the target cell, TCI state (s) , and, optionally, a TA value for the target cell.
[0056] In response to the LTM cell switch command, the UE 104 switches the target cell and applies the candidate configuration indicated by the target configuration ID. As a seventh step, the UE optionally performs a random access channel (RACH) procedure (or RACH-based LTM) if the UE 104 does not have a valid TA value of the target cell. The UE 104 does not perform the RACH procedure (or RACH-less LTM) if the UE 104 has a valid TA value for the target cell. For RACH-less LTM, the UE 104 accesses the target cell using either a configured grant or a dynamic grant. The configured grant may be provided in the LTM candidate configuration. The UE 104 may select a configured grant occasion based on the beam indicated in the LTM cell switch command.
[0057] As an eighth step, the UE 104 completes the LTM procedure by sending an RRC reconfiguration complete message (or RRCReconfigurationComplete) via the target cell. If the UE 104 performs the RACH procedure, the UE 104 may consider the LTM cell switch procedure complete when the RACH procedure is successful. Alternatively, if the UE 104 does not perform the RACH procedure, the UE 104 considers the LTM procedure complete when the UE 104 determines that the NE 102 has successfully received uplink data. In some examples, all the activated TCI states except those received in the LTM cell switch command are deactivated upon LTM cell switch execution. Steps four through eight may be performed multiple times for subsequent LTM procedures using the LTM candidates provided in step two.
[0058] The LTM procedure may support both intra-CU mobility and inter-CU mobility. Intra-CU mobility may refer to switching between different DUs within a same CU. Inter-CU mobility may refer to switching between different DUs of different CUs. Inter-CU mobility may be harder to perform when compared to intra-CU because inter-CU mobility may include inter-CU communication and a security change.
[0059] In some examples, the L1 measurement report as described in the fifth step of the LTM procedure may be configured to be event-triggered. That is, the UE 104 may transmit the L1 measurement report in response to one or more trigger conditions being met. In some examples, the trigger conditions may include a beam of the serving cell becoming worse than a first threshold (or absolute threshold) , a beam of a candidate cell becoming an amount of offset better than the beam of the serving cell, a beam of a candidate cell becoming better than a second threshold, or a beam of the serving cell becoming worse than a third threshold and a beam of a candidate cell becoming better than a fourth threshold. Further, the L1 measurement report may be transmitted from the UE 104 to the NE 102 using RRC signaling. In some examples, RRC applies layer 3 filtering and RRC PDUs are ciphered and integrity protected costing some time and processing resources.
[0060] Thus, it may be desirable for L1 measurement reports to be communicated via lower layer signaling to reduce latency and processing. According to implementations described herein, one or more of the UEs 104 are operable to transmit beam reports via a MAC-CE. The UE 104 receives a configuration for event-triggered beam reporting, obtains a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells, and generates, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells. The NE 102 (e.g., a base station, gNB) transmits the configuration for event-triggered beam reporting and receives, based on the configuration for the event-triggered beam reporting, a report including a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.
[0061] Reference is made herein to communicating data or information, such as signaling communication resources and / or communications that are transmitted or received between devices. It is to be appreciated that other terms may be used interchangeably with communicating, such as signaling, transmitting, receiving, outputting, forwarding, retrieving, obtaining, and so forth.
[0062] Figure 2 illustrates an example of a wireless communications system 200 in accordance with aspects of the present disclosure. In some examples, the wireless communications system 200 may support aspects of the wireless communications system 100. For example, the wireless communications system 200 may include a UE 204 and a NE 202 which may be examples of the UE 104 and the NE 102 as described with reference to Figure 1, respectively.
[0063] In some examples, the wireless communications system 200 may support an O-RAN architecture. For example, each NE 202 of the wireless communications system 200 may include a CU connected to one or more DUs. Each DU may be associated with a respective cell over which the DU may communicate with one or more UEs 204. In the example of Figure 1, the UE 204 may communicate with the NE 202-aor a DU of the NE 202-avia a serving cell.
[0064] As described with reference to Figure 1, the devices of the wireless communications system 200 may perform a mobility procedure (e.g., an LTM procedure) to switch the serving cell of the UE 204. The mobility procedure may support intra-DU mobility or inter-DU mobility. To initiate the mobility procedure, the UE 204 may perform event-triggered beam reporting.
[0065] In some examples, the UE 204 may receive a configuration 206. The configuration 206 may include one or more parameters for beam reporting. For example, the configuration 206 may include an indication of a set of beams that each correspond to a respective cell of a NE 202 or a DU of the wireless communications system 200. In the example of Figure 1, the configuration 206 may include at least beams corresponding to cells of the NE 202-aor the NE 202-b.
[0066] The configuration 206 may further include one or more trigger conditions for event-triggered beam reporting. The one or more trigger conditions may include a signal strength (e.g., reference signal received power (RSRP) , reference signal received quality (RSRQ) , or signal-to-interference-plus-noise ratio (SINR) ) of a beam of a cell (e.g., a serving cell or a candidate cell of the UE 204) satisfying (e.g., exceeding, meeting, or being below) a threshold. Additionally, or alternatively, the configuration 206 may include a timer (e.g., a prohibit timer) specifying a minimum length of time between measurement reports 208. When configured with the timer, the UE 204 may not transmit more than one report 208 in a period equal to the timer. Each time the UE 204 sends the report 208, the timer is restarted. The configuration 206 may further include a delta value that specifies a minimum amount of change that a beam must satisfy before being reported. In some examples, the configuration 206 may be an example of the RRC reconfiguration message as described with reference to Figure 1.
[0067] Upon receiving the configuration 206, the UE 204 may monitor the set of beams (e.g., the set of beams indicated in the configuration 206) . In other words, the UE 204 may measure signal strength values of downlink signals communicated via the set of beams. The UE 204 may detect, while measuring the set of beams, that at least one signal strength value of the set of beams satisfies the one or more trigger conditions indicated in the configuration 206. Upon satisfaction of the one or more trigger conditions, the UE 204 may obtain the signal strength values for each beam of the set of beams. A set of beams 0 through 5 and their corresponding RSRP values are shown in Table 1. The relative strengths of the RSRP values are denoted as: RSRP0 > RSRP1 > RSRP2 > RSRP3 > RSRP4 > RSRP 5. As shown in Table 1, the UE 204 may determine that both beam 1 and beam 2 satisfy the one or more trigger conditions. Table 1
[0068] The UE 204 may then construct a report 208 that indicates at least some of the information of Table 1. In some examples, constructing the report 208 may include packing the information into a MAC-CE 210. The UE 204 may pack the information in the MAC-CE 210 using different methods. According to a first method, the UE 204 may generate a MAC-CE 210 that includes a highest signal strength value of the measured signal strength values as an absolute value. Further, the UE 204 may include the remaining signal strength values as differential values in the MAC-CE 210 with respect to the absolute value. For example, according the first method, the UE 204 may generate a MAC-CE 210 that includes an absolute value of RSRP0 followed by differential values of RSRP1, RSRP2, RSRP3, RSRP4, and RSRP 5 with respect to RSRP0. Additionally, the UE 204 may include a 1-bit indicator for each beam indicating whether the corresponding beam is an event-triggering beam (=true) or not (=false) in the MAC-CE 210. An event-triggering beam refers to a beam whose corresponding signal strength value satisfied one or more of the configured trigger conditions. Additionally, the UE 204 may position the absolute value in the MAC-CE 210 before the differential values. The differential values may follow the absolute value in order from highest to lowest signal strength value.
[0069] In some examples, the NE 202-a may provide an uplink grant to the UE 204 for the report 208 that indicates a quantity of resources for transmitting the report 208. In some examples, the quantity of resources included in the uplink grant may not be sufficient for transmitting an entirety of the MAC-CE 210. In such case, the UE 204 may truncate the MAC-CE 210. That is, the UE 204 may remove some of the information from the MAC-CE 210. In some examples, the truncated MAC-CE may the event-triggered beam with the highest signal strength value as an absolute value and if there is space, the truncated MAC-CE may include signal strength values of one or more remaining event-triggered beams as differential values with respect to the absolute value. For example, the truncated MAC-CE may include at least an absolute value of RSRP1 followed by a differential value of RSRP2 with respect to the absolute value of RSRP1.
[0070] In some examples, the truncated MAC-CE may also include non-event triggered beams if there is room left over after the event-triggered beams. For example, the truncated MAC-CE may also include non-event triggered beams with signal strength values below the highest signal strength value of the event-triggered beams. For instance, the truncated MAC-CE may also include one or more of the RSRP3, the RSRP4, or the RSRP5 as differential values the respect to the absolute value of RSRP1. In such case, the truncated MAC-CE may also include 1-bit event-triggering indicators for all the beam except the beam with the highest signal strength value of the event-triggered beams. Alternatively, even if there is room left over in the truncated MAC-CE, the UE 204 may not include non-event-triggered beams in the truncated MAC-CE. In such case, the truncated MAC-CE may not include the 1-bit event-triggering indicators.
[0071] Alternatively, the UE 204 may pack the information in the MAC-CE 210 according to a second method. Using the second method, the UE 204 may include signal strength values for event-triggering beams first in the MAC-CE 210. That is, the UE 204 may include signal strength values for event-triggering beams first in the report even if signal strength values of non-event-triggering beams are higher than the signal strength values of the event-triggering beams. Similar to the first method, the UE 204 may include the highest signal strength value as an absolute value in the MAC-CE 210 and the remaining signal strength values as differential values in the MAC-CE 210 with respect to the absolute value. For example, the MAC-CE 210 may include a differential value of RSRP1 with respect to an absolute value of RSRP0 followed by a differential value for RSRP2 with respect to the absolute value of RSRP0 followed by the absolute value for RSRP0 followed by a differential value of RSRP3 with respect to the absolute value of RSRP0 followed by a differential value for RSRP4 with respect to the absolute value of RSRP0 followed by a differential value of RSRP5 with respect to the absolute value of RSRP0. To enable MAC-CE parsing, the UE 204 may include a one-bit indication for each signal strength value in the MAC-CE 210 that indicates whether the corresponding signal strength value is an absolute value or a differential value.
[0072] As another approach, the UE 204 may include the highest signal strength value for the event-triggering beams as an absolute value in the MAC-CE 210 and the remaining signal strength values as differential values in the MAC-CE 210 with respect to the absolute value. For example, the MAC-CE 210 may include an absolute value of RSRP1 followed by a differential value for RSRP2 with respect to the absolute value of RSRP1 followed by a differential value for RSRP0 with respect to the absolute value of RSRP1 followed by a differential value of RSRP3 with respect to the absolute value of RSRP1 followed by a differential value for RSRP4 with respect to the absolute value of RSRP1 followed by a differential value of RSRP5 with respect to the absolute value of RSRP1. To enable this approach, the UE 204 may include a one-bit indication (e.g., plus or minus) for each differential value indicating whether the differential value is added or subtracted from the absolute value.
[0073] As described above, the quantity of resources included in the uplink grant may not be sufficient for transmitting the entirety of the MAC-CE 210. In such case, the UE 204 may truncate the MAC-CE 210. In one example, the truncated MAC-CE may include at least one signal strength value of an event-triggered beam (e.g., absolute value of RSRP1) . When it is not possible to fit the at least one signal strength value of the event-triggered beam in the truncated MAC-CE, the UE 204 may pad any remaining bit in the truncated MAC-CE with padding bits.
[0074] For any beam included in the MAC-CE 210, the UE 204 includes the following information: the corresponding beam ID, the corresponding signal strength value (e.g., the absolute value or the differential value) , and optionally, a corresponding flag (e.g., event-triggering flag, A / D flag, plus / minus flag, etc. ) . If the UE 204 cannot fit the information corresponding to the beam in the MAC-CE 210, the UE 204 does not include the beam in the MAC-CE 210.
[0075] In some aspects, the UE 204 may be configured (or required) by the NE 202 to report information for the serving cell. In such case, the UE 204 may include the signal strength value of the serving cell in the MAC-CE 210 in its natural position based on its signal strength value compared to signal strength values of the other beams. The NE 202 may determine the serving beam based on the beam ID of the serving cell included in the report 208. If there are non-serving beams that can be included in the MAC-CE 210 and the signal strength value of the serving beam is less than the non-serving beams, the serving beam shall replace the last beam that would have otherwise been included in the MAC-CE 210. Alternatively, the UE 204 may include the signal strength of the serving beam as an absolute value first in the MAC-CE 210. The remaining beams may be included in the MAC-CE 210 as laid out in the first method or the second method.
[0076] Upon generating the MAC-CE 210, the UE 204 may transmit a report 208 to the NE 202 that includes the MAC-CE 210. In some examples, the UE 204 may report the information that was removed from the MAC-CE 210 because of truncation in one or more subsequent measurement reports 208. In some examples, the NE 202 may control if the UE 204 reports the remaining information in subsequent measurement reports 208. The UE 204 is either pre-configured to transmit or not transmit the remaining information. Alternatively, after the NE 202 receives the report 208, the NE 202 may make decision on whether the UE 204 reports the remaining information in one or more subsequent measurement reports 208 and informs the UE 204 of the decision.
[0077] In some examples, the UE 204 may trigger multiple MAC-CEs 210 (or multiple report configurations) . In such example, if the UE 204 determines that a same beam (e.g., a serving beam) is to be included in the multiple MAC-CEs, the UE 204 may only include signal measurements for that beam in the latest MAC-CE 210 of the multiple MAC-CEs 210. In another example, multiple MAC-CEs 210 may be pending at the UE 204, but the uplink grant may be sufficient for only one MAC-CE 210 of the multiple MAC-CEs 210. In such case, the UE may transmit the MAC-CE 210 that was most recently triggered via the uplink grant. Alternatively, a priority among the multiple MAC-CEs 210 may be defined. The priority may indicate which MAC-CE 210 among the multiple MAC-CEs 210 will be prioritized (or sent via the uplink grant) . For example, if an event that triggered a first MAC-CE 210 has higher configured priority than an event that triggered a second MAC-CE 210, then the UE 204 reports the first MAC-CE 210 via the uplink grant. Alternatively, the UE may truncate the multiple MAC-CEs such that the multiple MAC-CEs may be transmitted using the uplink grant.
[0078] Figure 3 illustrates an example MAC-CE format 300 in accordance with aspects of the present disclosure. In some examples, the MAC-CE format 300 may be implemented by aspects of the Figures 1 and 2. For example, the MAC-CE format 300 may be implemented by the UE 104 or the UE 204 as described with reference to Figure 1 or Figure 2.
[0079] As described with reference to Figure 1, a UE may receive a signal (e.g., an RRC signal) indicating one or more beam reporting configurations. In some examples, the signal may include the following information: a set of candidate beams, one or trigger conditions for reporting beam measurements, resources for transmitting a measurement report, a reporting configuration ID, a prohibit timer indicating a minimum time between measurement reports, or a delta signal strength value indicating a minimum amount of signal strength change that a beam must satisfy prior to being reported. For LTM, the signal may include at least an LTM-candidate IE and an LTM-CSI-Reporting IE. The LTM-CSI-Reporting IE may include an RRC configuration for periodic, aperiodic, and event-triggered beam reporting. In some examples, there are up to 48 different LTM CSI reporting configurations that are represented by 6 bits. Additionally, the LTM-CSI-Reporting IE may indicate a maximum number of reported beams. The maximum number of reported beams may be an integer up to a value of 256.
[0080] Upon receiving the configuration signaling, the UE may measure signal strengths of the set of candidates beams and determine that at least one of the measured signal strength values satisfies one or more of the trigger conditions. In response to determining that the at least one signal strength value satisfies the one or more trigger conditions, the UE may generate a MAC-CE 302.
[0081] In some examples, the UE may generate a subheader for the MAC-CE 302 that includes one or more of a reserved field (or R field) , a format field (or an F field) , a logical channel ID field (or an LCID field) , an extended LCID field (or eLCID field) , or a length field (or an L field) . The F field may indicate a size of the L field. The L field may indicate a length of the MAC-CE 302. The LCID field and the eLCID field may indicate a logical channel ID.
[0082] The UE may generate the MAC-CE 302 such that the MAC-CE 302 includes information representative of at least some of the measured signal strength values. In the example of Figure 3, the UE may generate a MAC-CE 302 that includes an absolute value of a first signal strength value of a first beam of the set of candidate beams, a differential value of a second signal strength value of a second beam of the set of candidate beams with respect to the absolute value, and a differential value of a third signal strength value of a third beam of the set of candidate beams with respect to the absolute value. In some examples, the first signal strength value may be the highest signal strength value of the measured signal strength values. Alternatively, the first signal strength may be the highest signal strength value of the measured signal strength values that triggered the one or more trigger conditions. In some examples, the UE may generate the MAC-CE 302 in accordance with the first or second method as described in Figure 2.
[0083] The number of beams that the UE may include in the MAC-CE 302 may be dependent on a length of the MAC-CE 302. As illustrated in Figure 3, the length of the MAC-CE 302 may be 10 octets. However, other lengths are possible. The first octet of the MAC-CE 302 may include a reporting configuration ID field, an entering / leaving field (or EL field) for the first beam, and an event trigger field (or ET field) for the first beam. The reporting configuration ID field may indicate the reporting configuration ID and may have a length of 6 bits. The EL field of the first octet may indicate whether the first signal strength is leaving (=1) or entering (=0) the trigger condition and may have a length of 1 bit. The ET field of the first octet may indicate whether the first signal strength has met the trigger condition (=1) or not (=0) and may have a length of 1 bit. In some examples, when ET is 0, EL is not evaluated.
[0084] The second octet of the MAC-CE 302 may include an R field and an absolute signal strength field. The absolute signal strength field of the second octet may indicate the absolute value of the first signal strength and may have a length of 7 bits. The third octet of the MAC-CE 302 may include a beam ID field. The beam ID field may indicate an ID of the first beam and may have a length of 8 bits. The fourth octet of the MAC-CE 302 may include a configuration ID field or a resource ID field. The configuration ID field may indicate the configuration ID (or an LTM configuration ID) of the first beam and may have a length of 8 bits. The resource ID field may indicate the measurement resource ID of the first beam and may have a length of 8 bits.
[0085] The fifth octet of the MAC-CE 302 may include an EL field for the second beam, an ET field for the second beam, two R fields, and a differential signal strength value field for the second beam. The EL field of the fifth octet may indicate whether the second signal strength is leaving or entering the trigger condition and may have a length of 1 bit. The ET field of the fifth octet may indicate whether the second signal strength has met the trigger condition and may have a length of 1 bit. The differential signal strength field of the fifth octet may indicate the differential value of the second signal strength and may have a length of 4 bits. The sixth octet of the MAC-CE 302 may include a beam ID field. The beam ID of the sixth octet field may indicate an ID of the second beam and may have a length of 8 bit. The seventh octet of the MAC-CE 302 may include a configuration ID field or a resource ID field. The candidate beam ID field of the seventh octet may indicate the configuration ID (or an LTM configuration ID) of the second beam and may have a length of 8 bits. The resource ID field of the seventh octet may indicate the measurement resource ID of the second beam and may have a length of 8 bits.
[0086] The eighth octet of the MAC-CE 302 may include an EL field for the third beam, an ET field for the third beam, two R fields, and a differential signal strength value field for the third beam. The EL field of the eighth octet may indicate whether the third signal strength is leaving or entering the trigger condition and may have a length of 1 bit. The ET field of the eighth octet may indicate whether the third signal strength has met the trigger condition and may have a length of 1 bit. The differential signal strength field of the eighth octet may indicate the differential value of the third signal strength and may have a length of 4 bits. The ninth octet of the MAC-CE may include a beam ID field. The beam ID of the ninth octet field may indicate an ID of the third beam and may have a length of 8 bit. The tenth octet of the MAC-CE 302 may include a configuration ID field or a resource ID field. The configuration ID field of the seventh octet may indicate the configuration ID (or an LTM configuration ID) of the third beam and may have a length of 8 bits. The resource ID field of the seventh octet may indicate the measurement resource ID of the third beam and may have a length of 8 bits.
[0087] In some examples, reserved bits of reserved fields of the MAC-CE 302 may be combined to indicate a quantity of beams or a quantity of measurement reports that are pending at the UE for transmission to the NE. Additionally, or alternatively, the MAC-CE 302 may include a single bit indicating whether the first signal strength measurement is associated with a serving beam of the UE or an event-triggering beam. Additionally, or alternatively, the MAC-CE 302 may include a 1-bit indication (=true) that indicates that an additional MAC-CE was triggered at the UE and a suitable grant to transmit the additional MAC-CE is requested. If this 1-bit indication is present in a truncated MAC-CE, the 1-bit indication will indicate that there is at least one full MAC-CE awaiting transmission in addition to measurement information removed from the MAC-CE via truncation. The MAC-CE 302 may additionally, or alternatively include an integer value that indicates how many MAC-CEs are pending at the UE for transmission. In some examples, for ‘reports on leave’ , a new MAC-CE (e.g., with a reserved LCID / eLCID) or a same MAC-CE is used. If using the same MAC-CE, a Boolean flag is included to signal if a beam has triggered entering or leaving.
[0088] Upon generating the MAC-CE 302, the UE may transmit the measurement report to the NE that includes the MAC-CE 302. Upon receiving the measurement report, the NE may perform one or more actions. The one or more action may include intuiting a cell switch operation.
[0089] Figure 4 illustrates a graph 400 in accordance with aspects of the present disclosure.
[0090] As described with reference to Figure 2, to restrict excessive beam reporting, a NE may configure a UE with a delta value 402. Figure 4 illustrates a signal strength 410 of a beam 406 measured by the UE from T0 to T3. As shown in Figure 4, at T1, the UE may transmit a measurement report 408 that includes an indication of the signal strength 410 of the beam 406 at T1. Upon transmitting the measurement report 408, the UE may not include measurement information for the beam 406 in another measurement report until the signal strength 410 increases to a value 414 or decreases to a value 412. The value 414 is the signal strength 410 at the time of reporting (e.g., at T1) plus the delta value 402 and the value 412 is the signal strength 410 at the time of reporting minus the delta value 402.
[0091] As shown in Figure 4, the signal strength 410 may increase to the value 414 from T1 to T2. Thus, the UE may transmit another measurement report that includes measurement information for the beam 406 any time after T2 (e.g., from T2 to T3) . In some examples, the NE may additionally configure the UE with a prohibit timer. In such case, the UE may refrain from transmitting another measurement report that includes measurement information for the beam 406 until after T2 and until after expiration of the prohibit timer. In some examples, the UE may initiate the prohibit timer upon transmitting the measurement report 408 at T1.
[0092] Figure 5 illustrates an example of a UE 500 in accordance with aspects of the present disclosure. The UE 500 may include a processor 502, a memory 504, a controller 506, and a transceiver 508. The processor 502, the memory 504, the controller 506, or the transceiver 508, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0093] The processor 502, the memory 504, the controller 506, or the transceiver 508, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
[0094] The processor 502 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 502 may be configured to operate the memory 504. In some other implementations, the memory 504 may be integrated into the processor 502. The processor 502 may be configured to execute computer-readable instructions stored in the memory 504 to cause the UE 500 to perform various functions of the present disclosure.
[0095] The memory 504 may include volatile or non-volatile memory. The memory 504 may store computer-readable, computer-executable code including instructions when executed by the processor 502 cause the UE 500 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 504 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
[0096] In some implementations, the processor 502 and the memory 504 coupled with the processor 502 may be configured to cause the UE 500 to perform one or more of the functions described herein (e.g., executing, by the processor 502, instructions stored in the memory 504) . For example, the processor 502 may support wireless communication at the UE 500 in accordance with examples as disclosed herein. The UE 500 may be configured to or operable to support a means for receiving a configuration for event-triggered beam reporting, obtaining a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells, and generating, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.
[0097] Additionally, the UE 500 may be configured to support any one or combination of transmitting a report including the MAC-CE in accordance with the received configuration for the event-triggered beam reporting.
[0098] Additionally, the UE 500 may be configured to support any one or combinations of transmitting the report based on expiration of a timer, where the timer is configured via the received configuration for the event-triggered beam reporting.
[0099] Additionally, the UE 500 may be configured to support any one or combinations of determining a change of the at least one signal strength value between a first time and a second time, where the MAC-CE indicates that absolute value of the at least one signal strength value based on the change of the at least one signal strength value between the first time and the second time satisfying a threshold, and where the threshold is indicated in the received configuration for the event-triggered beam reporting.
[0100] Additionally, or alternatively, the UE 500 may support at least one memory (e.g., the memory 504) and at least one processor (e.g., the processor 502) coupled with the at least one memory and configured to cause the UE to receive a configuration for event-triggered beam reporting, obtain a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells, and generate, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.
[0101] Additionally, the UE 500 may be configured to support any one or combination of the at least one processor configured to cause the UE 500 to transmit a report including the MAC-CE in accordance with the received configuration for the event-triggered beam reporting.
[0102] Additionally, the UE 500 may be configured to support any one or combination of the at least one processor configured to cause the UE 500 to transmit the report based on expiration of a timer, where the timer is configured via the received configuration for the event-triggered beam reporting.
[0103] Additionally, the UE 500 may be configured to support any one or combination of the at least one processor configured to cause the UE 500 to determine a change of the at least one signal strength value between a first time and a second time, where the MAC-CE indicates that absolute value of the at least one signal strength value based on the change of the at least one signal strength value between the first time and the second time satisfying a threshold, and where the threshold is indicated in the received configuration for the event-triggered beam reporting.
[0104] Additionally, the UE 500 may be configured to support any one or combination of the at least one processor configured to cause the UE 500 to determine, based on the set of signal strength values, a subset of the set of signal strength values meet a trigger condition for the event-triggered beam reporting, where the UE generates the MAC-CE based on the subset of the set of signal strength values meeting the trigger condition.
[0105] Additionally, the UE 500 may be configured to support any one or combination of the at least one processor configured to cause the UE 500 to determine multiple signal strength values meet the trigger condition, where the at least one signal strength value includes a highest signal strength value among the multiple signal strength values.
[0106] Additionally, the UE 500 may be configured to support any one or combination of the at least one processor configured to cause the UE 500 to receive an uplink grant that indicates a quantity of resources for transmission of the MAC-CE and truncate the MAC-CE based on the quantity of resources being less than a quantity of resources for transmission of the MAC-CE.
[0107] Additionally, the UE 500 may be configured to support any one or combination of the at least one processor configured to cause the UE 500 to adjust a payload of the MAC-CE by removing one or more signal strength values from the MAC-CE, where the one or more removed signal strength values do not meet a trigger condition.
[0108] The controller 506 may manage input and output signals for the UE 500. The controller 506 may also manage peripherals not integrated into the UE 500. In some implementations, the controller 506 may utilize an operating system such as or other operating systems. In some implementations, the controller 506 may be implemented as part of the processor 502.
[0109] In some implementations, the UE 500 may include at least one transceiver 508. In some other implementations, the UE 500 may have more than one transceiver 508. The transceiver 508 may represent a wireless transceiver. The transceiver 508 may include one or more receiver chains 510, one or more transmitter chains 512, or a combination thereof.
[0110] A receiver chain 510 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 510 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 510 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 510 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 510 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.
[0111] A transmitter chain 512 may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmitter chain 512 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmitter chain 512 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 512 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0112] Figure 6 illustrates an example of a processor 600 in accordance with aspects of the present disclosure. The processor 600 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 600 may include a controller 602 configured to perform various operations in accordance with examples as described herein. The processor 600 may optionally include at least one memory 604, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 600 may optionally include one or more arithmetic-logic units (ALUs) 606. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0113] The processor 600 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 600) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0114] The controller 602 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 600 to cause the processor 600 to support various operations in accordance with examples as described herein. For example, the controller 602 may operate as a control unit of the processor 600, generating control signals that manage the operation of various components of the processor 600. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0115] The controller 602 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 604 and determine subsequent instruction (s) to be executed to cause the processor 600 to support various operations in accordance with examples as described herein. The controller 602 may be configured to track memory addresses of instructions associated with the memory 604. The controller 602 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 602 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 600 to cause the processor 600 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 602 may be configured to manage flow of data within the processor 600. The controller 602 may be configured to control transfer of data between registers, ALUs 606, and other functional units of the processor 600.
[0116] The memory 604 may include one or more caches (e.g., memory local to or included in the processor 600 or other memory, such as RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 604 may reside within or on a processor chipset (e.g., local to the processor 600) . In some other implementations, the memory 604 may reside external to the processor chipset (e.g., remote to the processor 600) .
[0117] The memory 604 may store computer-readable, computer-executable code including instructions that, when executed by the processor 600, cause the processor 600 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 602 and / or the processor 600 may be configured to execute computer-readable instructions stored in the memory 604 to cause the processor 600 to perform various functions. For example, the processor 600 and / or the controller 602 may be coupled with or to the memory 604, the processor 600, and the controller 602, and may be configured to perform various functions described herein. In some examples, the processor 600 may include multiple processors and the memory 604 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0118] The one or more ALUs 606 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 606 may reside within or on a processor chipset (e.g., the processor 600) . In some other implementations, the one or more ALUs 606 may reside external to the processor chipset (e.g., the processor 600) . One or more ALUs 606 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 606 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 606 may be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 606 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 606 to handle conditional operations, comparisons, and bitwise operations.
[0119] The processor 600 may support wireless communication in accordance with examples as disclosed herein. The processor 600 may be configured to or operable to support at least one controller (e.g., the controller 602) coupled with at least one memory (e.g., the memory 604) and configured to cause the processor to receive a configuration for event-triggered beam reporting, obtain a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells, and generate, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.
[0120] Additionally, the processor 600 may be configured to or operable to support any one or combination of transmitting a report including the MAC-CE in accordance with the received configuration for the event-triggered beam reporting.
[0121] Additionally, the processor 600 may be configured to or operable to support any one or combination of transmitting the report based on expiration of a timer, where the timer is configured via the received configuration for the event-triggered beam reporting.
[0122] Additionally, the processor 600 may be configured to or operable to support any one or combination of determining a change of the at least one signal strength value between a first time and a second time, where the MAC-CE indicates that absolute value of the at least one signal strength value based on the change of the at least one signal strength value between the first time and the second time satisfying a threshold, and where the threshold is indicated in the received configuration for the event-triggered beam reporting.
[0123] Additionally, the processor 600 may be configured to or operable to support any one or combination of determining, based on the set of signal strength values, a subset of the set of signal strength values meet a trigger condition for the event-triggered beam reporting, where the UE generates the MAC-CE based on the subset of the set of signal strength values meeting the trigger condition.
[0124] Additionally, the processor 600 may be configured to or operable to support any one or combination of determining multiple signal strength values meet the trigger condition, where the at least one signal strength value includes a highest signal strength value among the multiple signal strength values.
[0125] Additionally, the processor 600 may be configured to or operable to support any one or combination of receiving an uplink grant that indicates a quantity of resources for transmission of the MAC-CE and truncating the MAC-CE based on the quantity of resources being less than a quantity of resources for transmission of the MAC-CE.
[0126] Additionally, the processor 600 may be configured to or operable to support any one or combination of adjusting a payload of the MAC-CE by removing one or more signal strength values from the MAC-CE, where the one or more removed signal strength values do not meet a trigger condition.
[0127] Moreover, the processor 600 may be configured to or operable to support at least one controller (e.g., the controller 602) coupled with at least one memory (e.g., the memory 604) and configured to cause the processor to transmit a configuration for event-triggered beam reporting and receive, based on the configuration for the event-triggered beam reporting, a report including a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.
[0128] Additionally, the processor 600 may be configured to or operable to support any one or combination of receiving the report based on expiration of a timer, where the timer is configured via the received configuration for the event-triggered beam reporting.
[0129] Figure 7 illustrates an example of an NE 700 in accordance with aspects of the present disclosure. The NE 700 may include a processor 702, a memory 704, a controller 706, and a transceiver 708. The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0130] The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
[0131] The processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 702 may be configured to operate the memory 704. In some other implementations, the memory 704 may be integrated into the processor 702. The processor 702 may be configured to execute computer-readable instructions stored in the memory 704 to cause the NE 700 to perform various functions of the present disclosure.
[0132] The memory 704 may include volatile or non-volatile memory. The memory 704 may store computer-readable, computer-executable code including instructions when executed by the processor 702 cause the NE 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 704 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
[0133] In some implementations, the processor 702 and the memory 704 coupled with the processor 702 may be configured to cause the NE 700 to perform one or more of the functions described herein (e.g., executing, by the processor 702, instructions stored in the memory 704) . For example, the processor 702 may support wireless communication at the NE 700 in accordance with examples as disclosed herein. The NE 700 may be configured to or operable to support a means for transmitting a signal configuring a UE for event-triggered beam reporting and receiving, based on the signal configuring the UE for the event-triggered beam reporting, a measurement report including a MAC-CE that includes an absolute value of a first signal strength value of a first beam of beams associated with a set of cells.
[0134] Additionally, or alternatively, the NE 700 may support at least one memory (e.g., the memory 704) and at least one processor (e.g., the processor 702) coupled with the at least one memory and configured to cause the NE to transmit a configuration for event-triggered beam reporting and receive, based on the configuration for the event-triggered beam reporting, a report including a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.
[0135] Additionally, the NE 700 may be configured to support any one or combination of the at least one processor configured to cause the NE 700 to receive the report based on expiration of a timer, where the timer is configured via the received configuration for the event-triggered beam reporting.
[0136] The controller 706 may manage input and output signals for the NE 700. The controller 706 may also manage peripherals not integrated into the NE 700. In some implementations, the controller 706 may utilize an operating system such as or other operating systems. In some implementations, the controller 706 may be implemented as part of the processor 702.
[0137] In some implementations, the NE 700 may include at least one transceiver 708. In some other implementations, the NE 700 may have more than one transceiver 708. The transceiver 708 may represent a wireless transceiver. The transceiver 708 may include one or more receiver chains 710, one or more transmitter chains 712, or a combination thereof.
[0138] A receiver chain 710 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 710 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 710 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 710 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 710 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.
[0139] A transmitter chain 712 may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmitter chain 712 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmitter chain 712 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 712 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0140] Figure 8 illustrates a flowchart of a method 800 in accordance with aspects of the present disclosure. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.
[0141] At 802, the method may include receiving a configuration for event-triggered beam reporting. The operations of 802 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 802 may be performed by a UE as described with reference to Figure 5.
[0142] At 804, the method may include obtaining a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells. The operations of 804 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 804 may be performed by a UE as described with reference to Figure 5.
[0143] At 806, the method may include generating, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells. The operations of 806 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 806 may be performed a UE as described with reference to Figure 5.
[0144] Figure 9 illustrates a flowchart of a method 900 in accordance with aspects of the present disclosure. The operations of the method may be implemented by an NE as described herein. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.
[0145] At 902, the method may include transmitting a configuration for event-triggered beam reporting. The operations of 902 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 902 may be performed by an NE as described with reference to Figure 7.
[0146] At 904, the method may include receiving, based on the configuration for the event-triggered beam reporting, a report including a MAC-CE that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells. The operations of 904 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 904 may be performed by an NE as described with reference to Figure 7.
[0147] Figure 10 illustrates a process flow 1000 in accordance with aspects of the present disclosure. In some examples, the process flow 1000 may be performed by a UE 1004 which may be an example of the UE 104, the UE 204, or the UE 500 as described with reference to Figures 1, 2, and 5, respectively. Moreover, the process flow 1000 may be performed by an NE 1002 which may be an example of the NE 102, the NE 202, or the NE 700 as described with reference to Figures 1, 2, and 7 respectively.
[0148] At 1006, the NE 1002 may transmit, to the UE 1004, a configuration for event-triggered beam reporting.
[0149] At 1008, the UE 1004 may obtain a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells. In some examples, the UE 1004 may determine a change of at least one signal strength value between a first time and a second time satisfies a threshold. The threshold may be indicated in the configuration at 1006. Moreover, the UE 1004 may determine that at least a subset of the obtained set of signal strength values meet a trigger condition for the event-triggered beam reporting.
[0150] At 1010, the UE 1004 may generate, based on the obtained set of signal strength values, a MAC-CE that indicates at least an absolute value of the at least one signal strength value. In some examples, the MAC-CE may indicate the absolute value based on the change of the at least one signal strength value satisfying the threshold. The MAC-CE may also indicate a differential value of a second signal strength value of a corresponding beam with respect to the absolute value of the at least one signal strength value. In some examples, the UE 1004 may generate the MAC-CE based on the determination that the subset of signal strength values meet the trigger condition. In some examples, the at least one signal strength value may include a highest signal strength value among the subset of signal strength values that meet the trigger condition. Alternatively, or additionally, the at least one signal strength value may include a highest signal strength value of the obtained set of signal strength values.
[0151] In some examples, prior to generating the MAC-CE, the UE 1004 may receive an uplink grant indicating a quantity of resources for transmitting the MAC-CE. If the quantity of resources indicated in the uplink grant is less than a quantity of resource for transmitting a MAC-CE, the UE 1004 may truncate the MAC-CE. That is, the UE 1004 may adjust a payload of the MAC-CE by removing one or more signal strength values from the MAC-CE. In some examples, the UE 1004 may remove signals strength values that do not meet the trigger condition.
[0152] At 1012, the UE 1004 may transmit a report including the MAC-CE in accordance with the configuration. In some examples, the UE 1004 may transmit the measurement report based on expiration of a timer which may be configured via the configuration at 1006.
[0153] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) for wireless communication, comprising:at least one memory; andat least one processor coupled with the at least one memory and operable to cause the UE to:receive a configuration for event-triggered beam reporting;obtain a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based at least in part on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells; andgenerate, based at least in part on the obtained set of signal strength values, a medium access control-control element (MAC-CE) that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.2.The UE of claim 1, wherein the at least one processor is further operable to cause the UE to:transmit a report comprising the MAC-CE in accordance with the received configuration for the event-triggered beam reporting.3.The UE of claim 2, wherein, to transmit the report, the at least one processor is operable to cause the UE to:transmit the report based at least in part on expiration of a timer, wherein the timer is configured via the received configuration for the event-triggered beam reporting.4.The UE of claim 1, wherein the at least one processor is further operable to cause the UE to:determine a change of the at least one signal strength value between a first time and a second time, wherein the MAC-CE indicates that absolute value of the at least one signal strength value based at least in part on the change of the at least one signal strength value between the first time and the second time satisfying a threshold, and wherein the threshold is indicated in the received configuration for the event-triggered beam reporting.5.The UE of claim 1, wherein the MAC-CE further indicates a differential value of a second signal strength value of a corresponding beam of a respective cell of the set of cells with respect to the absolute value of the at least one signal strength value.6.The UE of claim 1, wherein the at least one processor is further operable to cause the UE to:determine, based at least in part on the set of signal strength values, a subset of the set of signal strength values meet a trigger condition for the event-triggered beam reporting, wherein the UE generates the MAC-CE based at least in part on the subset of the set of signal strength values meeting the trigger condition.7.The UE of claim 6, wherein the at least one processor is further operable to cause the UE to:determine multiple signal strength values meet the trigger condition, wherein the at least one signal strength value comprises a highest signal strength value among the multiple signal strength values.8.The UE of claim 1, wherein the at least one processor is further operable to cause the UE to:receive an uplink grant that indicates a quantity of resources for transmission of the MAC-CE; andtruncate the MAC-CE based at least in part on the quantity of resources being less than a quantity of resources for transmission of the MAC-CE.9.The UE of claim 8, wherein, to truncate the MAC-CE, the at least one processor is operable to cause the UE to:adjust a payload of the MAC-CE by removing one or more signal strength values from the MAC-CE, wherein the one or more removed signal strength values do not meet a trigger condition.10.The UE of claim 1, wherein the at least one signal strength value comprises a highest signal strength value among the obtained set of signal strength values.11.A method performed by a user equipment (UE) , the method comprising:receiving a configuration for event-triggered beam reporting;obtaining a set of signal strength values associated with one or more respective beams of each respective cell of a set of cells based at least in part on measurement of a respective signal strength value of a corresponding beam associated with each cell of the set of cells; andgenerating, based at least in part on the obtained set of signal strength values, a medium access control-control element (MAC-CE) that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of the set of cells.12.The method of claim 11, further comprising:transmitting a report comprising the MAC-CE in accordance with the received configuration for the event-triggered beam reporting.13.The method of claim 12, wherein transmitting the report comprises:transmitting the report based at least in part on expiration of a timer, wherein the timer is configured via the received configuration for the event-triggered beam reporting.14.The method of claim 11, further comprising:determining a change of the at least one signal strength value between a first time and a second time, wherein the MAC-CE indicates that absolute value of the at least one signal strength value based at least in part on the change of the at least one signal strength value between the first time and the second time satisfying a threshold, and wherein the threshold is indicated in the received configuration for the event-triggered beam reporting.15.The method of claim 11, wherein the MAC-CE further indicates a differential value of a second signal strength value of a corresponding beam of a respective cell of the set of cells with respect to the absolute value of the at least one signal strength value.16.A network equipment (NE) for wireless communication, comprising:at least one memory; andat least one processor coupled with the at least one memory and operable to cause the NE to:transmit a configuration for event-triggered beam reporting; andreceive, based at least in part on the configuration for the event-triggered beam reporting, a report comprising a medium access control-control element (MAC-CE) that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.17.The NE of claim 16, wherein the at least one processor is further operable to cause the NE to:receive the report based at least in part on expiration of a timer, wherein the timer is configured via the received configuration for the event-triggered beam reporting.18.The NE of claim 16, wherein the configuration for the event-triggered beam reporting indicates a threshold change the at least one signal strength value satisfies to be reported.19.The NE of claim 16, wherein the MAC-CE further indicates a differential value of a second signal strength value of a corresponding beam of a respective cell of the set of cells with respect to the absolute value of the at least one signal strength value.20.A method performed by a network equipment (NE) , the method comprising:transmitting a configuration for event-triggered beam reporting; andreceiving, based at least in part on the configuration for the event-triggered beam reporting, a report comprising a medium access control-control element (MAC-CE) that indicates at least an absolute value of at least one signal strength value associated with at least one beam of at least one cell of a set of cells.
Citation Information
Patent Citations
Method for measuring and reporting channel state information for network cooperative communication
CN114175705A
Terminal, radio communication method, and base station
US20240040520A1
Measurement reporting for wireless communication network
US20240298201A1
Systems and methods of beamforming indication
WO2022169716A1