UL indication in the first pucch delay with ueibm

Abstract

An apparatus configured to: receive a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

Description

UL INDICATION IN THE FIRST PUCCH DELAY WITH UEIBMTECHNICAL FIELD

[0001] The example and non-limiting embodiments relate generally to beam management and, more particularly, to transmission of an indication of a channel state information report after detection of an event triggering reporting.BACKGROUND

[0002] It is known, in beam management, to control a delay between transmission of an indication of a channel state information report, and transmission of the channel state information report.SUMMARY

[0003] The following summary is merely intended to be illustrative. The summary is not intended to limit the scope of the claims.

[0004] In accordance with one aspect, an apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus at least to: receive a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0005] In accordance with one aspect, a method comprising: receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0006] In accordance with one aspect, an apparatus comprising means for: receiving a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0007] In accordance with one aspect, a computer-readable medium comprising program instructions stored thereon for performing at least the following: causing receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0008] In accordance with one aspect, an apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus at least to: transmit, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at leastone event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receive the indication at a time that is based, at least partially, on the transmitted information.

[0009] In accordance with one aspect, a method comprising: transmitting, with a network node to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receiving the indication at a time that is based, at least partially, on the transmitted information.

[0010] In accordance with one aspect, an apparatus comprising means for: transmitting, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receiving the indication at a time that is based, at least partially, on the transmitted information.

[0011] In accordance with one aspect, a computer-readable medium comprising program instructions stored thereon for performing at least the following: causing transmitting, with a network node to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of atleast one reference signal triggering the event; and causing receiving of the indication at a time that is based, at least partially, on the transmitted information.

[0012] In accordance with one aspect, an apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus at least to: receive a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event is triggered with one or more reference signals; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0013] In accordance with one aspect, a method comprising: receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0014] In accordance with one aspect, an apparatus comprising means for: receiving a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0015] In accordance with one aspect, a computer-readable medium comprising program instructions stored thereon for performing at least the following: causing receiving, with a user equipment, of a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0016] In accordance with one aspect, an apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus at least to: transmit, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and receive the indication at a time that is based, at least partially, on the transmitted information.

[0017] In accordance with one aspect, a method comprising: transmitting, with a network node to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and receiving the indication at a time that is based, at least partially, on the transmitted information.

[0018] In accordance with one aspect, an apparatus comprising means for: transmitting, to at least one user equipment, a configuration for performing event based beam reporting, wherein theconfiguration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and receiving the indication at a time that is based, at least partially, on the transmitted information.

[0019] In accordance with one aspect, a computer-readable medium comprising program instructions stored thereon for performing at least the following: causing transmitting, to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and causing receiving of the indication at a time that is based, at least partially, on the transmitted information.

[0020] According to some aspects, there is provided the subject matter of the independent claims. Some further aspects are defined in the dependent claims.BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The foregoing aspects and other features are explained in the following description, taken in connection with the accompanying drawings, wherein:

[0022] FIG. 1 is a block diagram of one possible and non-limiting example system in which the example embodiments may be practiced;

[0023] FIG. 2 is a diagram illustrating features as described herein;

[0024] FIGs. 3A and 3B are diagrams illustrating features as described herein;

[0025] FIG. 4 is a diagram illustrating features as described herein;

[0026] FIG. 5 is a diagram illustrating features as described herein;

[0027] FIG. 6 is a diagram illustrating features as described herein;

[0028] FIG. 7 is a diagram illustrating features as described herein;

[0029] FIG. 8 is a diagram illustrating features as described herein;

[0030] FIG. 9 is a diagram illustrating features as described herein;

[0031] FIG. 10 is a diagram illustrating features as described herein;

[0032] FIG. 11 is a diagram illustrating features as described herein;

[0033] FIG. 12 is a flowchart illustrating steps as described herein;

[0034] FIG. 13 is a flowchart illustrating steps as described herein;

[0035] FIG. 14 is a flowchart illustrating steps as described herein; and

[0036] FIG. 15 is a flowchart illustrating steps as described herein.DETAILED DESCRIPTION OF EMBODIMENTS

[0037] The following abbreviations that may be found in the specification and / or the drawing figures are defined as follows:3 GPP third generation partnership project5G fifth generation5GC 5G core networkAMF access and mobility management functionBFR beam failure recoveryBM beam managementCE control elementCC component carriercRAN cloud radio access networkCSI channel state informationCU central unitDCI downlink control informationDL downlinkDU distributed unit eNB (or eNodeB) evolved Node B (e.g., an LTE base station)EN-DC E-UTRA-NR dual connectivity en-gNB or En-gNB node providing NR user plane and control plane protocol terminations towards the UE, and acting as secondary node in EN- DCE-UTRA evolved universal terrestrial radio access, i.e., the LTE radio access technologyFR frequency range gNB (or gNodeB) base station for 5G / NR, i.e., a node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GCIE information elementEF interfaceLI layer 1LTE long term evolutionMAC medium access controlMIMO multiple input multiple outputMME mobility management entity mTRP multiple transmission and / or reception point ng or NG new generation ng-eNB or NG-eNB new generation eNBNR new radioN / W or NW networkNZP non-zero-powerOFDM orthogonal frequency division multiplex O-RAN open radio access networkPBCH physical broadcast channelPDCCH physical downlink control channelPDCP packet data convergence protocolPDSCH physical downlink shared channelPHY physical layerPUCCH physical uplink control channelPUSCH physical uplink shared channelQCL quasi co locationRAN radio access networkRF radio frequencyRLC radio link controlRRC radio resource controlRRH remote radio headRS reference signalRSRP reference signal received powerRU radio unitRx receiverSDAP service data adaptation protocolSGW serving gatewaySINR signal to interference plus noise ratioSMF session management functionSR scheduling requestSRS sounding reference signalSSB synchronization signal / PBCH block sTRP single transmission and / or reception pointTCI transmission configuration indicatorTRP transmission and / or reception pointTx transmitterUCI uplink control informationUE user equipment (e.g., a wireless, typically mobile device)UEIBM user equipment -initiated beam managementUL uplinkUPF user plane functionVNR virtualized network function

[0038] Turning to FIG. 1 , this figure shows a block diagram of one possible and non-limiting example in which the examples may be practiced. A user equipment (UE) 110, radio access network (RAN) node 170, and network element(s) 190 are illustrated. In the example of FIG. 1, the user equipment (UE) 110 is in wireless communication with a wireless network 100. A UE is a wireless device that can access the wireless network 100. The UE 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130 interconnected through one or more buses 127. Each of the one or more transceivers 130 includes a receiver, Rx, 132 and a transmitter, Tx, 133. The one or more buses 127 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, and the like. A “circuit” may include dedicated hardware or hardware in association with software executable thereon. The one or more transceivers 130 are connected to one or more antennas 128. The one or more memories 125 include computer program code 123. The UE 110 includes a module 140, comprising one of or both parts 140-1 and / or 140-2, which may be implemented in a number of ways. The module 140 may be implemented in hardware as module 140-1, such as being implemented as part of the one or more processors 120. The module 140-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array. In another example, the module 140 may be implemented as module 140-2, which is implemented as computer program code 123 and is executed by the one or more processors 120. For instance, the one or more memories 125 and the computer program code 123 may be configured to, with the one or more processors 120, cause the user equipment 110 to perform one or more of the operations as described herein. The UE 110 communicates with RAN node 170 via a wireless link 111.

[0039] The RAN node 170 in this example is a base station that provides access by wireless devices such as the UE 110 to the wireless network 100. The RAN node 170 may be, for example, a base station for 5G, also called New Radio (NR). In 5G, the RAN node 170 may be a NG-RAN node, which is defined as either a gNB or a ng-eNB. A gNB is a node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to a 5GC (such as, for example, the network element(s) 190). The ng-eNB is a node providing E- UTRA user plane and control plane protocol terminations towards the UE, and connected via the NG interface to the 5GC. The NG-RAN node may include multiple gNBs, which may also include a central unit (CU) (gNB-CU) 196 and distributed unit(s) (DUs) (gNB-DUs), of which DU 195 is shown. Note that the DU may include or be coupled to and control a radio unit (RU). The gNB- CU is a logical node hosting RRC, SDAP and PDCP protocols of the gNB or RRC and PDCP protocols of the en-gNB that controls the operation of one or more gNB-DUs. The gNB-CU terminates the Fl interface connected with the gNB -DU. The Fl interface is illustrated as reference 198, although reference 198 also illustrates a link between remote elements of the RAN node 170 and centralized elements of the RAN node 170, such as between the gNB-CU 196 and the gNB-DU 195. The gNB-DU is a logical node hosting RLC, MAC and PHY layers of the gNB or en-gNB, and its operation is partly controlled by gNB-CU. One gNB-CU supports one or multiple cells. One cell is supported by only one gNB-DU. The gNB-DU terminates the Fl interface 198 connected with the gNB-CU. Note that the DU 195 is considered to include the transceiver 160, e.g., as part of a RU, but some examples of this may have the transceiver 160 as part of a separate RU, e.g., under control of and connected to the DU 195. The RAN node 170 may also be an eNB (evolved NodeB) base station, for LTE (long term evolution), or any other suitable base station, access point, access node, or node.

[0040] The RAN node 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N / W I / F(s)) 161, and one or more transceivers 160 interconnected through one or more buses 157. Each of the one or more transceivers 160 includes a receiver, Rx, 162 and a transmitter, Tx, 163. The one or more transceivers 160 are connected to one or more antennas 158. The one or more memories 155 include computer program code 153. The CU 196 may include the processor(s) 152, memories 155, and network interfaces 161. Note that the DU195 may also contain its own memory / memories and processor(s), and / or other hardware, but these are not shown.

[0041] The RAN node 170 includes a module 150, comprising one of or both parts 150-1 and / or 150-2, which may be implemented in a number of ways. The module 150 may be implemented in hardware as module 150-1, such as being implemented as part of the one or more processors 152. The module 150-1 may be implemented also as an integrated circuit or through other hardware such as a programmable gate array. In another example, the module 150 may be implemented as module 150-2, which is implemented as computer program code 153 and is executed by the one or more processors 152. For instance, the one or more memories 155 and the computer program code 153 are configured to, with the one or more processors 152, cause the RAN node 170 to perform one or more of the operations as described herein. Note that the functionality of the module 150 may be distributed, such as being distributed between the DU 195 and the CU 196, or be implemented solely in the DU 195.

[0042] The one or more network interfaces 161 communicate over a network such as via the links 176 and 131. Two or more gNBs 170 may communicate using, e.g., link 176. The link 176 may be wired or wireless or both and may implement, for example, an Xn interface for 5G, an X2 interface for LTE, or other suitable interface for other standards.

[0043] The one or more buses 157 may be address, data, or control buses, and may include any interconnection mechanism, such as a series of lines on a motherboard or integrated circuit, fiber optics or other optical communication equipment, wireless channels, and the like. For example, the one or more transceivers 160 may be implemented as a remote radio head (RRH) 195 for LTE or a distributed unit (DU) 195 for gNB implementation for 5G, with the other elements of the RAN node 170 possibly being physically in a different location from the RRH / DU, and the one or more buses 157 could be implemented in part as, for example, fiber optic cable or other suitable network connection to connect the other elements (e.g., a central unit (CU), gNB-CU) of the RAN node 170 to the RRH / DU 195. Reference 198 also indicates those suitable network link(s).

[0044] It is noted that description herein indicates that “cells” perform functions, but it should be clear that equipment which forms the cell will perform the functions. The cell makes up part of a base station. That is, there can be multiple cells per base station. For example, there could be three cells for a single carrier frequency and associated bandwidth, each cell covering one-third of a 360 degree area so that the single base station’s coverage area covers an approximate oval or circle. Furthermore, each cell can correspond to a single carrier and a base station may use multiple carriers. So if there are three 120 degree cells per carrier and two carriers, then the base station has a total of 6 cells.

[0045] The wireless network 100 may include a network element or elements 190 that may include core network functionality, and which provides connectivity via a link or links 181 with a further network, such as a telephone network and / or a data communications network (e.g., the Internet). Such core network functionality for 5G may include access and mobility management function(s) (AMF(s)) and / or user plane functions (UPF(s)) and / or session management function(s) (SMF(s)). Such core network functionality for LTE may include MME (Mobility Management Entity) / SGW (Serving Gateway) functionality. These are merely illustrative functions that may be supported by the network element(s) 190, and note that both 5G and LTE functions might be supported. The RAN node 170 is coupled via a link 131 to a network element 190. The link 131 may be implemented as, e.g., an NG interface for 5G, or an SI interface for LTE, or other suitable interface for other standards. The network element 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N / W I / F(s)) 180, interconnected through one or more buses 185. The one or more memories 171 include computer program code 173. The one or more memories 171 and the computer program code 173 are configured to, with the one or more processors 175, cause the network element 190 to perform one or more operations.

[0046] The wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functionality into a single, software -based administrative entity, a virtual network. Network virtualization involves platform virtualization, often combined with resource virtualization. Network virtualization is categorized as either external, combining many networks, or parts of networks, into a virtual unit, or internal, providing network-like functionality to software containers on a single system. For example, anetwork may be deployed in a tele cloud, with virtualized network functions (VNF) running on, for example, data center servers. For example, network core functions and / or radio access network(s) (e.g. CloudRAN, O-RAN, edge cloud) may be virtualized. Note that the virtualized entities that result from the network virtualization are still implemented, at some level, using hardware such as processors 152 or 175 and memories 155 and 171, and also such virtualized entities create technical effects.

[0047] It may also be noted that operations of example embodiments of the present disclosure may be carried out by a plurality of cooperating devices (e.g. cRAN).

[0048] The computer readable memories 125, 155, and 171 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The computer readable memories 125, 155, and 171 may be means for performing storage functions. The processors 120, 152, and 175 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on a multicore processor architecture, as non-limiting examples. The processors 120, 152, and 175 may be means for performing functions, such as controlling the UE 110, RAN node 170, and other functions as described herein.

[0049] In general, the various example embodiments of the user equipment 110 can include, but are not limited to, cellular telephones such as smart phones, tablets, personal digital assistants (PDAs) having wireless communication capabilities, portable computers having wireless communication capabilities, image capture devices such as digital cameras having wireless communication capabilities, gaming devices having wireless communication capabilities, music storage and playback appliances having wireless communication capabilities, Internet appliances permitting wireless Internet access and browsing, tablets with wireless communication capabilities, as well as portable units or terminals that incorporate combinations of such functions.

[0050] Having thus introduced one suitable but non-limiting technical context for the practice of the example embodiments of the present disclosure, example embodiments will now be described with greater specificity.

[0051] Features as described herein may generally relate to beam management (BM). From Rel-15 of 5G NR, beam management has been specified in three procedures controlled by the network: Procedure#! (Pl, 210), Procedure#! (P2, 220) and Procedure#3 (P3, 230), as described in 3GPP TS 38.214 Section 5.1.5 (TCI and QCL framework) and 5.1.6 (CSI-RS reception procedures) and illustrated in FIG. 2. Furthermore, Pl, P2, and P3 were specified according to 3GPP Rel-15 SI of 5G NR TR 38.802.

[0052] The following beam management procedures are supported within one or multiple transmission and / or reception points (TRP) of the serving cell. Pl (210) is used to enable UE measurement on different TRP Tx beams to support selection of TRP Tx beams / UE Rx beam(s), and it typically includes an intra / inter-TRP Tx beam sweep with, for example, synchronization signal block (SSB) beams. P2 (220) is used to enable UE measurement on different TRP Tx beams, to possibly change inter / intra-TRP Tx beam(s), for example for beam refinement, than in Pl by using narrower channel state information (CSI) beams compared to SSB beams. P3 (230) is used to enable UE measurement on the same TRP Tx beam to change UE Rx beam in the case the UE uses beamforming (e.g. mmW arrays on UEs for FR2 operation). P3 may use aperiodic CSI-RS.

[0053] Rel-15 to Rel-18 has specified periodic, semi -persistent and aperiodic CSI reporting, as shown in TABLE 1 (Table 5.2.1.4-1: Triggering / Activation of CSI Reporting for the possible CSI-RS Configurations):TABLE 1

[0054] The network may configure the UE to perform according to any of these reporting configurations.

[0055] Features described herein may generally relate to the unified transmission configuration indicator (TCI) framework. Rel-17 has introduced the “unified” TCI framework, meaning that TCI states providing quasi co location (QCL) assumptions for the reception of DL signals and channels, and can also be used to provide spatial sources for the transmission of UL signals and channels to determine the UL TX spatial filter. Furthermore, the unified TCI framework defines the concept of an indicated TCI state, where one or multiple (in case of multi- TRP for instance) of the configured TCI states is / are indicated TCI state(s) at a time. The indicatedTCI state can be a joint DL and UL TCI state, or a separate DL TCI state and a separate UL TCI state.

[0056] A UE may be configured with a plurality of TCI states. Of those configured TCI states, a subset may be activated, such that the UE may be prepared to start tracking / monitoring the reference signals associated with the activated TCI states. Of those activated TCI states, one or more TCI states may be indicated. The UE may then be configured to transmit or / and receive a signal or channel using the indicated TCI state(s).

[0057] A UE can be configured with up to 128 TCI states. The gNB configures the UE via RRC signaling with TCI states, where each TCI state may have one or two source reference signals (RS) that provide quasi co-location (QCL) parameters for the target RS, with only one RS providing QCL type D per TCI state. QCL information may also be used for beam indication provided by the gNB to configure the UE with a transmit / receive beam to be used for downlink and uplink.

[0058] Rel-17 introduced the unified TCI framework for single transmission and / or reception point (sTRP), with one indicated joint DL and UL TCI state at a time, OR one indicated DL TCI state and a separate indicated UL TCI state at a time for the UE. Rel- 18 then extended the unified TCI framework for multiple transmission and / or reception point (mTRP), with two indicated joint TCI states at a time, OR two separate indicated DL TCI states and two separate indicated UL TCI states at a time for the UE. A visual representation of the unified TCI framework after Rel-17 for sTRP and after Rel- 18 with extension to mTRP are shown in PIGs. 3 A and 3B, respectively. In PIG. 3A, at 310 there is a pool of Rel-17 TCI states, comprising joint DL / UL TCI states or separately configured UL and DL TCI states. At 320, up to eight of the TCI states may be activated, whether jointly configured DL / UL TCI states or separately configured DL and UL TCI states. At 330, an activated TCI state may be indicated; there may be one indicated TCI state at a time. In PIG. 3B, at 340 there is a pool of Rel-17 / 18 TCI states, comprising joint DL / UL TCI states or separately configured UL and DL TCI states. At 350, up to eight of the TCI states may be activated, whether jointly configured DL / UL TCI states or separately configured DL and UL TCI states. At 360, of the activated TCI states, up to two TCI states may be indicated at a time.

[0059] Features as described herein may generally relate to UE-initiated beam management (UEIBM), where the UE may decide when to report channel or beam conditions to the network or base station. In the scope of Rel-19, some use cases where UE could benefit from initiating the beam management (UEIBM) reporting are being identified (e.g. to facilitate beam switch). The UE-initiated TCI-state / beam reporting feature refers to the case where the UE may be configured with at least one event / condition, and then the UE may start TCI-state beam reporting if this at least one event / condition occurs or is satisfied. Rel-19 MIMO work item description (RP-234007) is as follows:“...Specify enhancement to facilitate UE-initiated / event-driven beam management for reducing overhead and / or latency, assuming the unified TCI while leveraging (as much as possible) legacy CSI measurement and reporting configuration frameworks, targeting FR2 and sTRP with intra- and inter-cell beam managementUL signaling content(s) (and procedure(s) as required) for UE-initiated / event- driven beam reporting facilitating fast beam switchingUL signaling medium / container considering the UE-initiated / event-driven nature of the UL transmission, designed primarily for the purpose of beam reporting...”

[0060] Features as described herein may generally relate to triggering event(s) for UEIBM. In the context of which event(s) may trigger a UEIBM report, there are the following agreements and working assumptions:“...On UE-initiated / event-driven beam reporting, regarding trigger-event detection for beam reporting, at least support Event-2: Quality of at least one new beam, such as Ll- RSRP, becomes a threshold value better than the current beam.At least Ll-RSRP is supported as quality metrics used for Event-2FFS: How the Ll-RSRP is used to determine the triggering event (e.g. timer, counter, filter coefficient)FFS: Whether the network controls how the Ll-RSRP is used to determine the triggering eventRegarding RS measurement for the new beam for Event-2, down-select one or more of the following:Option-3a (explicit manner): The RS(s) for new beam(s) are explicitly configured by RRC (e.g., reusing legacy configuration of RS measurement or in TCI-State) or MAC-CEOption-3b (implicit manner): The RS(s) for new beam(s) are implicitly derived from QCL RS(s) of activated TCI state(s).Option-3c (implicit manner): The RS(s) for new beam(s) are implicitly derived from QCL RS(s) of configured TCI state(s).Note-1: ‘New / current beam’ is for discussion purpose.Note-2: Other trigger events / quality metrics (e.g., Ll-SINR) are not precluded.Note-3: For above implicit manner(s), if there are two QCL RSs in a TCI state, the measurement RS is derived from RS w.r.t. QCL-TypeD, if applicable.On UE-initiated / event-driven beam reporting, regarding trigger events, besides for Event- 2, Event- 1 and Event-7 are both supported.Event- 1 : Quality of the current beam is worse than a certain threshold.Event-7: Quality of at least one new beam, such as Ll-RSRP, becomes a threshold value better than the RS derived from the activated TCI state with the M-th best quality.M is RRC configured with subjective to UE capability signallingUE may only indicate a single candidate value or not support Event- 7.The additionally supported events will reuse the same design as event 2 - unless there is consensus to do otherwiseThe additionally supported events will be lower priority compared to event 2...”

[0061] Event-2, where the quality of at least one new beam, such as Ll-RSRP, becomes a “threshold value” better than the current beam, has been agreed as an event that can trigger a UEIBM report. For example, the network may configure the UE with a certain threshold, forexample 3 dB, and when the UE measures a new beam to have a Ll-RSRP which is 3 dB better than the Ll-RSRP of the current beam, then a UEIBM report is triggered.

[0062] Besides Event-2, some other events are currently under discussion. For example, Event- 1 and Event-7 are expected to be supported. Event- 1 , where the quality of the current beam is worse than a certain threshold, may be used to avoid costly procedures like BFR. Event-7, where the quality of at least one new beam, such as Ll-RSRP, becomes a threshold value better than the RS derived from the activated TCI state with the M-th best quality, may be used to update the active TCI state list.

[0063] Features as described herein may generally relate to UL signaling of content of the beam report in UEIBM. In the context of what to report, i.e., the UL signal content of the UEIBM report with Event-2 with Ll-RSRP as quality metric, the following has been agreed:“...On UE-initiated / e vent-driven beam reporting, regarding UL signaling content(s) of Ll-RSRP report depending on Event-2, in a report instance, at least Option-3 is supported Option-3 : N > 1 beam(s) are reported in the report instance,At least one of N reported beam(s) should satisfy the condition of Event-2 N is configured by gNBFFS: candidate value of ‘N’.FFS: RRC can enable or disable whether current beam is always reported in addition to the N beamsFFS: Option- l / la / lb / 2.Above applies at least for the single CC case.On UE-initiated / e vent-driven beam reporting, regarding Ll-RSRP report format Option- 3 depending on Event-2, for a report instance where N > 1 beam(s) are reported, the following is supported.RRC can enable or disable whether current beam is always reportedWhen enabled by RRC, the current beam + N beams from the measurement RSs for new beam(s) are reportedNote: The reported current beam is NOT counted in the N reported beams.When disabled by RRC, N beams are reported...”

[0064] For Event-2, it has been agreed that the UE reports N beams, for example the top N beams, with N>1 configured by the network via RRC, and at least one of those N beams satisfies Event-2. Then, in addition to those N beams, the network may configure via RRC the UE to also report the current beam.

[0065] Features as described herein may generally relate to UEIBM report procedures. In the context of how these reports are sent back by the UE to the network, there are the following agreements and working assumptions:“... On beam report transmission procedure for UE-initiated / event-driven beam reporting, following modes are supported:Mode A (dynamically scheduling UCI by gNB):Step 1 : UE transmits a first PUCCH (one-bit / multi-bit) to request a resource for a second UL channel to carry beam reportFFS: Request format, e.g., SR or a new UCI type.Step 2: UE detects the DCI format to indicate a resource for a second UL channel to carry beam report.Step 3: Beam report is transmitted in second UL channel.FFS: Details on the second UL channel, e.g., whether the second UL channel is PUCCH, PUSCH or bothThis mode is basic UE capability (i.e. all UE supporting UE-initiated / event-driven beam reporting should support this feature).No new DCI format is introduced.Mode B (UCI in pre-configured resource(s) for second UL channel):Step 1: UE transmits a first PUCCH (one-bit / multi-bit) notifying a second UL channel to carry beam reportFFS: Notification format, e.g., SR or a new UCI type.Step 2: UE transmits the beam report in the second UL channel.FFS: Details on the second UE channel, e.g., whether the second UE channel is PUCCH, PUSCH or bothThe notification in Step 1 is in a separate reporting instance from the beam report in Step 2.FFS : Whether UE receives acknowledge information with response to each step for all modesFor above procedures, cross-CC beam reporting is supported for both modes.FFS: Details.On beam report transmission procedure for UE-initiated / event-driven beam reporting For mode-A, at least support one-bit indication in the first PUCCH channel to request a resource for a second UE channel to carry beam report.In such case, a periodic PUCCH resource (with PUCCH format 0 / 1) is configured by dedicated RRC signaling.For mode-B, at least support one-bit indication in the first PUCCH channel to notify a second UE channel to carry beam report.In such case, a periodic PUCCH resource (with PUCCH format 0 / 1) is configured by dedicated RRC signaling.FFS: Whether / how to support multi-bit indication in the first PUCCH for mode-A and mode-B, e.g., when multi-event(s) are approved.FFS: details on the dedicated RRC signalingAbove applies at least for the single CC case.On beam report transmission procedure for UE-initiated / event-driven beam reporting, regarding the dedicated RRC signaling for first PUCCH channel configuration for Mode- A, down-select one of the followingAlt-1 (dedicated SR for mode-A): Introduce RRC parameter, e.g., reportResourceRequest-UEIBR, corresponding to the one -bit indication in the first PUCCH channelThe RRC parameter is associated with the dedicated SchedulingRequestld. Note: The detailed signaling is up to RAN2.Alt 2 (new UCI type): Introduce RRC parameter, e.g., firstPUCCHResourceConfig-ModeA-UEIBR, for the periodic PUCCH resource configuration.Note: The RRC parameter is NOT associated with SchedulingRequestld.FFS: how to encode 1-bit to PUCCH resource, e.g., reuse encoding mechanism of positive / negative SR.The dedicated RRC parameter at least comprises the following: periodicity AndOffset PUCCH-ResourcelDAbove applies at least for the single CC case.On beam report transmission procedure for UE-initiated / event-driven beam reporting, regarding the dedicated RRC signaling for first PUCCH channel configuration for Mode- B, down-select one of the followingAlt 1 (dedicated SR for mode-B): Introduce RRC parameter, e.g., reportNotification-UEIBR, corresponding to the one -bit indication in the first PUCCH channelThe RRC parameter is associated with the dedicated SchedulingRequestld. Note: The detailed signaling is up to RAN2.Alt 2 (new UCI type): Introduce RRC parameter, e.g., firstPUCCHResourceConfig-ModeB-UEIBR, for the periodic PUCCH resource configuration.Note: The RRC parameter is NOT associated with SchedulingRequestld.FFS: how to encode 1-bit to PUCCH resource, e.g., reuse encoding mechanism of positive / negative SR.The dedicated RRC parameter at least comprises the following: periodicity AndOffset PUCCH-ResourcelDAbove is at least applied to a single CC case...

[0066] Two procedures for actually sending back the report have been agreed: Mode A and Mode B. Mode A is the baseline, and is going to be supported by all UEs capable of UEIBM. Mode B is optional and may be supported by only some UEs.

[0067] In Mode A, the second UL channel for the UEIBM report is dynamically scheduled by the gNB. Mode A comprises performing at least the following steps: the UE sends in a first PUCCH channel an UL indication to request to the gNB resources in a second UL channel to carry the UEIBM report; the gNB indicates via DCI to the UE a resource in a second UL channel to carry the UEIBM report; and the UE sends the UEIBM report on the second UL channel.

[0068] In Mode B, the second UL channel for the UEIBM report is pre-configured by the gNB. Mode B comprises performing at least the following steps: the UE sends in a first PUCCH channel an UL indication to notify to the gNB that a UEIBM report will be transmitted in a second UL channel; and the UE sends the UEIBM report on the second UL channel. The resources used by the UE to send the UEIBM report may be selected by the UE from one or more preconfigured UL resources.

[0069] Features as described herein may generally relate to RS measurements for current and new beams in UEIBM. In the context of which RSs should be monitored / measured for current and new beams by the UE, there are the following agreements:“...Regarding RS measurement for the current beam for Event 2, for Option-2a, support the both schemes as follows.Scheme- 1: RS for current beam is the QCL RS in the indicated TCI stateFFS: Whether / How to handle the case if only one TRS is configured in the indicated TCI state.Scheme-2: the RS for current beam is the SSB which is QCLed with the QCL RS in the indicated TCI state.Enabling one of either Scheme- 1 or Scheme-2 is selected by NW.FFS: The above selection is via an explicit RRC parameter or an implicit manner, e.g., if the RS(s) for new beam are CSI-RS, Scheme- 1 is enabled; otherwise, Scheme-2 is enabled.(Working Assumption) Enabling of either Scheme- 1 or Scheme-2 should ensure the same RS type for RS measurement for current beam and new beam.The above QCL RS is the RS w.r.t. QCL-TypeD, if there are two QCL RSs in the indicated TCI state.Regarding explicit RS configuration for new beam measurement for Event 2, at least Option- 1 is supportedOption- 1: The RS(s) for new beam(s) are explicitly configured in one RS resource set associated with an CSI reporting configurationIf legacy UE capability signaling cannot be reused, introduce a UE capability signaling of indicating the maximum number of the configured RS(s) in the RS resource set.FFS: The RS in the RS resource set can be updated by MAC-CE...”

[0070] For Event-2, the UE is configured to monitor the current beam and a certain number of new beams. More specifically, the UE may be configured to monitor the RS for the current beam that is related to the indicated TCI state. There are two schemes under discussion; in particular, if the RS is the actual RS in the indicated TCI state, or if the RS is the SSB which is QCLed with the actual RS in the indicated TCI state. These schemes may have the technical effect of making sure that current and new beams are of the same “type”, e.g., either all SSBs or all CSI- RSs. Additionally or alternatively, the UE may be configured to monitor the RS(s) for the new beam(s) that are explicitly configured by the network via RRC.

[0071] Once an event, for example Event-2, has been triggered, the UE starts, depending on the UE configuration, either Mode A or Mode B procedure to send the UEIBM report to the network. The UE then reports N beams, with N>1 configured by the network via RRC, where atleast one of those N beams satisfies Event-2. Once the event is triggered, the UE reports the top- N beams, although not all such N beams satisfy the conditions of Event-2.

[0072] It has been recognized, with the following agreement here below, that it needs to be ensured that the UEIBM report is transmitted from the UE to the network within a certain reporting delay, to make sure for example that the information on the reported beams is “fresh” enough, i.e., not outdated, to allow the network to take robust actions:“...Issue 2-1-3: Whether / how to define new delay requirements such as measurement reporting delay / measurement period?Define Event triggered measurement reporting delay requirementFurther discuss:Whether to support both mode A and mode BWhether to differentiate mode A and mode BOther related aspects...”

[0073] Referring now to FIG. 4, illustrated is an example of UEIBM mode A (e.g. dynamically scheduled resources for UCI transmission). In mode A, the transmission of an event triggered report (430) is preceded by an uplink indication (e.g. via first physical uplink control channel (PUCCH)) (410). The network requests the event triggered report via downlink control information (DCI) (e.g. indication in the DCI) that includes a UL grant for the event triggered report (420). The UE provisions the event triggered report on the provided UL grant associated with the DCI indication (430).

[0074] Referring now to FIG. 5, illustrated is an example of UEIBM mode B (e.g. preconfigured resources for UCI transmission). In mode B, the transmission of an event triggered report (520) is preceded by an uplink indication (510). The event triggered report (520) is provided on the pre -provisioned UL grant (i.e. periodical grant). The indication (510) may be referred as a “first PUCCH” transmission, and it indicates that the UE provides the event triggered report on the associated UL resource / grant.

[0075] For both Modes A and B, the total measurement reporting delay is composed by two main components, a first delay and a second delay. The first delay is the delay for the UE to send in a first PUCCH channel an UL indication after an event has been triggered. In Mode A, the first delay is the delay to request the resources in a second UL channel to send the UEIBM report. In Mode B, the first delay is the delay to notify that the UEIBM report will be transmitted on certain pre-configured resources in a second UL channel. The second delay is the delay for the UE to send the UEIBM report in a second UL channel after the UL indication in a first PUCCH channel has been transmitted.

[0076] Various agreements have been made with respect to the second delay between the first PUCCH and the UEIBM report transmission. Regarding Mode B, the following has been agreed where the UEIBM report is transmitted by the UE on the first available occasion in the second UL channel X symbols after the UL indication in the first PUCCH:“... On beam report transmission procedure for UE-initiated / event-driven beam reporting, regarding Mode-B, UEI beam report is carried on a first available transmission occasion of the second UL channel X symbols after sending the last symbol of report notification on the first PUCCH channel.On beam report transmission procedure for UE-initiated / event-driven beam reporting, regarding resource mapping / configuration between first and second channel in Mode-B, for a given CSI report configuration, the following is provided for down-selection.Option- 1 (one-to-one): Only one first PUCCH resource and only one preconfigured resource for second UL channel can be associated with the CSI report configuration for UE-initiated / event-driven beam reporting.Option- 1 A: Same periodicity between first PUCCH resource and preconfigured resource for second UL channel.Option- IB: No restriction in terms of periodicity.Option-2 (one-to-M): Only one first PUCCH resource and one or more preconfigured resource(s) for second UL channel can be associated with CSI report configuration for UE-initiated / event-driven beam reporting...”

[0077] Accordingly, the UE, in Mode B, sends a UEIBM report immediately after the UL indication in the first PUCCH, with a gap of X symbols to allow the UE for instance to process / create the actual UEIBM report.

[0078] Regarding Mode A, such second delay simply depends on how quickly the network allocate UL resources to a UE, and therefore depends on the network-configured time domain allocation K2 value and the PUSCH preparation time N2 (see also TS 38.214).

[0079] It may be noted that, in mobility use cases, event-triggered (periodic) reporting may be performed. Event-triggered reporting requirements have already been defined for mobility use cases e.g. in clause 9.2.4 of TS 38.133 for “Event-triggered Reporting” and “Event-triggered Periodic Reporting”. In the existing requirements, the measurement reporting delay is defined as the time between an event that will trigger a measurement report, and the point when the UE starts to transmit the measurement report over the air interface. For intra-frequency measurements, the delay shall be less than either Tidentifyjntra_with_index or Tidentifyjntra_withoutjndex. However, these requirements cannot be applied in a straightforward way to the UEIBM feature, which involves LI measurements and reporting.

[0080] It may be noted that, in 38.214, for aperiodic CSI reporting, two parameters / requirements have been defined, Z and Z’. Z is the minimum number of OFDM symbols between the last OFDM symbol of the PDCCH triggering the aperiodic CSI report and the first symbol of the PUSCH carrying the CSI report. Z’ is the minimum number of OFDM symbols between the last symbol of the aperiodic RS used to calculate the CSI report and the first symbol of the PUSCH carrying the CSI report. As shown for example in the table below from 38.214, the values of Z and Z’ depend on the SCS p; and the latency class, with three different classes to which (Zl, ZU) or (Z2, Z2’) or (Z3, Z3’) apply, with different classes used for different reports. For beam management, class 3 is used, i.e., (Z3, Z3’), and the values further depend on certain UE capabilities Xp (beamReportTiming) and KBi (beamSwitchTiming). Referring now to TABLE 2, illustrated are examples of the CSI computation delay requirement for aperiodic CSI reporting:TABLE 2

[0081] Z and Z’ are defined as minimum delays required by the UE to transmit a CSI / beam report, to make sure that the gNB for example does not schedule the PUSCH transmission of a report too close in time to the CSLRS measurement occasion. However, these parameters cannot be used in a straightforward way for UEIBM, because for UEIBM we need maximum delays for the UE to perform certain task(s), such as sending the UL indication in the first PUCCH or sending the UEIBM report itself.

[0082] In an example embodiment, a maximum delay requirement may be defined for UEIBM for the UE to send the UL indication in the first PUCCH channel to the network after an event is triggered (i.e. first delay). In an example embodiment, the maximum delay requirement may be applicable for Mode A operation, Mode B operation, or both. A technical effect of example embodiments of the present disclosure may be to ensure that the UEIBM report that is transmitted in the second UL channel is received at the network with information that is not outdated. Outdated information may be considered information that has a likeliness, less than a threshold value, of reflecting a current state of the condition being described. In the case of channel state information,information may be outdated when it is unlikely to reflect the current state of a channel or one or more reference signals.

[0083] In the present disclosure, the terms “maximum delay requirement”, “maximum delay”, “maximum timing”, and “maximum timing requirement” may be used interchangeably. A maximum delay requirement may be considered a requirement that defines when a UE may or must transmit a signal on PUCCH, after detection of an event, relative to a starting reference point. A maximum delay requirement may be defined via time units or via symbols / occasions. A maximum delay requirement may define a time after which a signal may be transmitted on PUCCH. Alternatively, a maximum delay requirement may define a time during which a signal must be transmitted on PUCCH.

[0084] In an example embodiment, UE behavior may be defined with respect to the maximum delay requirement.

[0085] It may be noted that, for event detection in UEIBM, there may be at least two beams, or potentially even more than two beams in the case of Event-7, and therefore RSs, that need to be monitored / measured by the UE for triggering the event, and the periodicities of the two RSs may be different (see, e.g., FIG. 6).

[0086] It may also be noted that, in contrast to FIG. 6, the periodicity of one CSI-RS may not be a multiple of the periodicity of the other CSI-RS (see, as a numerical example, the potential periodicities of CSI-RS illustrated in FIG. 7 and as defined in TS 38.331).

[0087] It may also be noted that, although it has been proposed that current and new beams be of the same “type”, either all CSI-RSs or all SSBs, to simplify for instance RSRP comparison at the UE side, the UEIBM report may contain N beams, including beams that are not explicitly configured by the network as new beams. That has the consequence that, for example, there may be current and new beams configured by the network as CSI-RSs, but the UE may also report SSBs in the UEIBM report, and this information of such beams should also not be outdated.

[0088] Referring now to FIG. 6, illustrated is a scenario with a current beam (610) and the first PUCCH channel (630) having the same periodicity Ti (640), which is half of the periodicity T2 (650) of the new beam (620).

[0089] A technical effect of example embodiments of the present disclosure may be to ensure that the UL indication in the first PUCCH channel is sent when the beams involved in triggering the event(s) and / or the beams included in the UEIBM report have been measured recently enough (e.g. is not considered outdated information by the network).

[0090] In an example embodiment, a maximum delay / timing requirement for UEIBM (for both Mode A and Mode B) may be defined between a “starting reference point” and the UL indication in the first PUCCH channel sent by the UE to the network. In an example embodiment, the starting reference point may be related to a symbol of a RS that is either associated with the triggering event, or is included in the UEIBM report. The symbol of the RS may be the last symbol of the RS. Alternatively, the symbol of the RS may be the first symbol of the RS, or the K-th symbol of the RS (e.g. a predetermined symbol in the RS).

[0091] In the present disclosure, the terms “starting reference point” and “reference point” may be used interchangeably.

[0092] In the present disclosure, a symbol of an RS may be the time instant at which such symbol is either transmitted by the network, or received by the UE. It may be noted that RS may not be measured in the order they are transmitted or received; it is not defined in what order RS are measured.

[0093] In an example embodiment, the starting reference point may be a symbol of the RS (SSBs or periodic CSI-RSs) that actually triggered the event. For Event-2, assuming a network configured threshold of 3 dB, the starting reference point may be either a new beam whose RSRP has just been measured to be at least 3 dB better than the last RSRP measured for the current beam, or the current beam whose RSRP has just been measured to be 3 dB worse than a previously measured new beam. For Event- 1, the starting reference point may be the current beam. For Event-7, the starting reference point may be either a new beam, or a beam in the active TCI statelist (which is not necessarily “new”, i.e. has not been configured by the network to be monitored for triggering events).

[0094] When the UE is configured to initiate a UEIBM report if the number of Event instances is greater than or equal to a configurable number M within a configurable time window (e.g., with M=3 and a time window of 100 ms, Event-2 is triggered if a new beam is measured at least M=3 times to be better than the current beam in such 100 ms time window), a symbol of the RS that actually triggered the event may refer to the RS transmission at which the Mth event instance has been measured / observed.

[0095] In another example embodiment, which may be applicable to Event-2 and / or Event- 1, the starting reference point may be a symbol (e.g. last symbol) of the RS associated to the current beam (SSB or periodic CSI-RS) that actually triggered the event. It may be noted that the current beam may not be the most recently measured beam. Considering a symbol of the current beam, rather than a symbol of either a new beam or a current beam, as the starting reference point may result in the starting reference point always referring to the same RS (unless of course when it is switched). The network may potentially configure tens of new beams (some RANI proposals say also all RRC configured TCI states, so up to 64 / 128 new beams); using as the starting reference point a symbol of a current beam, such as the last symbol, may have the technical effect of providing predictability on when a first PUCCH may be sent by the UE.

[0096] In another example embodiment, which may be applicable to Event-7, the starting reference point may be a symbol of the RS (e.g. the last symbol) associated to the beam (SSB or periodic CSI-RS) with the M-th best quality in the active TCI state list that actually triggered the event. In other words, the starting reference point may be a symbol of an RS, associated to an active transmission configuration indicator state, that is ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank. The quality may refer to a RSRP value, a SINR value, etc.

[0097] In another example embodiment, the starting reference point may be a symbol of a RS associated to a new beam (SSB or periodic CSI-RS) that actually triggered the event. Atechnical effect of this example embodiment may be to ensure that a new beam, to which beam switching may be scheduled by the network after the UEIBM report is sent, may be reported with the most fresh / recent information.

[0098] In another example embodiment, the starting reference point may be a symbol of a RS associated to a configured / predefined beam (SSB or periodic CSI-RS) that is included in the UEIBM report. In other words, a symbol of any RS that has to be reported in the CSI report may be used as the starting reference point. A technical effect of this example embodiment may be to ensure that reported beams contain fresh / recent information.

[0099] In another example embodiment, the starting reference point may be a symbol of the RS associated to the beam with the best RSRP (or SINR or similar (quality) metric) (SSB or periodic CSI-RS) that is included in the UEIBM report. A technical effect of this example embodiment may be to ensure that the beam with the best RSRP, toward which a beam switch may be scheduled by the network after the UEIBM report is sent, may be reported with the most fresh / recent information.

[0100] In another example embodiment, the starting reference point may be a symbol of the RS (SSBs or periodic CSI-RSs) among the ones triggering the event with the longest / largest periodicity. For example, the UE may determine that multiple RS trigger the event at substantially a same time. Such RS may be a new beam or the current beam or (for Event-7) a beam in the active TCI state list. A technical effect of this example embodiment may be to ensure that all involved beams triggering the event may have been measured recently.

[0101] In another example embodiment, the starting reference point may be a symbol of the RS (SSBs or periodic CSI-RSs) among the ones included in the UEIBM report with the longest / largest periodicity.

[0102] In another example embodiment, if the RSs of all beams configured for UEIBM are contained in the SSB burst and have all the same periodicity, the starting reference point may be the end of the SSB burst.

[0103] In another example embodiment, if the RSs of all beams configured for UEIBM are contained in a (time) window of X ms and all have the same periodicity, the reference point may be the end of the X ms (time) window.

[0104] In an example embodiment, the maximum delay requirement for UEIBM between the starting reference point and the UL indication in the first PUCCH channel may be constrained to be not larger than (e.g. equal to or less than) the shortest / smallest periodicity among the periodicity of the RSs that may trigger the event (as configured as current or new beams). Additionally or alternatively, the maximum delay requirement for UEIBM between the starting reference point and the UL indication in the first PUCCH channel may be constrained to be not larger than (e.g. equal to or less than) the shortest / smallest periodicity among the periodicity of the RSs that may be included in the UEIBM report. In other words, the UE may send the UL indication within a time frame specified by the maximum delay requirement. Additionally or alternatively, the maximum delay requirement for UEIBM between the starting reference point and the UL indication in the first PUCCH channel may be constrained to be not larger than (e.g. equal to or less than) a predetermined value.

[0105] In an example embodiment, if the UE cannot transmit the UL indication within the time frame specified by the maximum delay requirement, the UE may cancel transmission of the UL indication, and / or may begin monitoring for a next instance of fulfillment / satisfaction of event criteria.

[0106] In an alternative example embodiment, the maximum delay requirement for UEIBM between the starting reference point and the UL indication in the first PUCCH channel may be specified by setting the UE to send such UL indication in the first PUCCH channel occasion Y symbols (or alternatively Y ms) after the starting reference point. In other words, the UE may not send the UL indication until at least Y symbols / ms have elapsed after the starting reference point. The UE may use a counter or a timer to determine when it may send the UL indication.

[0107] In another example embodiment, the maximum delay requirement for UEIBM between the starting reference point and the UL indication in the first PUCCH channel sent by theUE to the network may be subject to UE capabilities. In an example embodiment, there may be a set of maximum delays (or values for Y as in the previous embodiment) at the NW or configured at the UE, and the UE may report, for example via RRC to the network, the maximum delay it needs / supports. For example, more capable UEs may report shorter delays for sending the UL indication in the first PUCCH channel than less capable UEs.

[0108] In another example embodiment, the maximum delay requirement for UEIBM between the starting reference point and the UL indication in the first PUCCH channel sent by the UE to the network may depend on the triggering event. In an example embodiment, there may be a first value of such delay for Event- 1 , a different value for Event-2, and a third different value for Event-7. A technical effect of this example embodiment may be to allow / enable stricter / shorter delays for more critical events, e.g., Event-2 and Event- 1, where the RSRP of the current beam may be becoming bad when compared to a less critical event (in terms of the possibility of, e.g., beam failure), for example Event-7.

[0109] In an example embodiment, the information about the starting reference point and the maximum delay between the starting reference point and the UL indication in the first PUCCH channel may be fixed and directly specified, for example in TS 38.133.

[0110] In an example embodiment, the UE may receive at least part of the information about the starting reference point and the maximum delay between the starting reference point and the UL indication in the first PUCCH channel from the network, for example via RRC, MAC-CE or DCI.

[0111] In an example embodiment, the network (e.g. a gNB, base station, or other network entity) may, based on the UL indication received via PUCCH, determine how recent the content included in a later received CSI report may be. For example, the network may be able to estimate the age or time of measurement / calculation of the content based on the maximum delay requirement and / or the starting reference point used to transmit the UL indication.

[0112] In an example embodiment, the network may use information regarding the maximum delay requirement and / or the starting reference point used to transmit the UL indication to make a beam switching decision.

[0113] In an example embodiment, for example where the UE is operating according to Mode A, the network may determine to not allocate UL resources to the UE for transmission of a CSI report if the NW determines, based on the UL indication, the maximum delay requirement, and / or the starting reference point, that the information that would be included in the CSI report would not be current or useful.

[0114] A technical effect of example embodiments of the present disclosure may be to ensure that the UEIBM report transmitted by the UE in the second UL channel always carries information regarding triggering events and / or reported beams, e.g., RSRP or other metrics like SINR, that is not outdated.

[0115] Referring now to FIG. 8, illustrated is an example of UE operation according to an example embodiment of the present disclosure, for example where the starting reference point may be a symbol of the RS that actually triggered the event, and where a fixed maximum delay may be used for sending the UL indication in the first PUCCH channel. In the example of FIG. 8, it may be assumed that the UE has been configured to trigger reporting in response to Event-2, with a threshold of 3 dB; the current beam is CSI-RS1 (810), the new beam is CSI-RS2 (820), both CSI- RS1 (810) and CSI-RS2 (820) have the same periodicity of Ti (840), the first PUCCH channel (830) has a shorter periodicity Ti / 2 (850), and the maximum delay (870) for sending the UL indication in the first PUCCH channel is Ti (840). Note that CSI-RS1 (810) and CSI-RS2 (820) may not be the only beams that the UE is measuring: the UE may be measuring (and reporting, for example with legacy periodic reporting) also other beams, i.e., SSBs and CSI-RSs, that are not configured by the network for Event-2 triggering.

[0116] In the example of FIG. 8, the UE may first measure the current beam (810) having RSRP of -85 dBm. Then, it may measure the new beam (820) having RSRP of -80 dBm, and determine that Event-2 has been triggered (860). At this point a timer may be started, and the UEmay have a maximum delay Ti (870) for sending the UL indication in the first PUCCH channel (830), which may mean that it may send the UL indication either in the 2nd (880) or in the 3rd (890) first PUCCH channel occasions within the maximum delay (870). UEs with a better implementation may use the 2nd(880), whereas UEs with worse implementation may use the 3rd(890).

[0117] Referring now to FIG. 9, illustrated is an example of UE operation according to an example embodiment of the present disclosure, for example where the starting reference point may be a symbol of the RS that actually triggered the event, and where a fixed maximum delay may be used for sending the UL indication in the first PUCCH channel. In the example of FIG. 9, it may be assumed that the UE has been configured to trigger reporting in response to Event-2, with a threshold of 3 dB; the current beam is CSLRS1 (910), the new beam is CSLRS2 (920), both CSL RS1 (910) and CSLRS2 (920) have same periodicity of Ti (940), the first PUCCH channel (930) has a shorter periodicity Ti / 2 (950), and the maximum delay (970) for sending the UL indication in the first PUCCH channel is Ti (940). Note that CSLRS1 (910) and CSLRS2 (920) may not be the only beams that the UE is measuring: the UE may be measuring (and reporting, for example with legacy periodic reporting) also other beams, i.e., SSBs and CSLRSs, that are not configured by the network for Event-2 triggering.

[0118] In the example of FIG. 9, the UE may first measure the current beam (910) having RSRP of -85 dBm. Then, it may measure the new beam (920) having RSRP of -85 dBm. Then, it may measure again the current beam (910), but now having RSRP of -90 dBm, and thus determines that Event-2 has been triggered (960). At this point a timer may be started, and the UE may have a maximum delay (970) Ti (940) for sending the UL indication in the first PUCCH channel (930), which may mean that it may send the UL indication either in the 3rd (980) or in the 4th (990) first PUCCH channel occasion within the maximum delay (970). UEs with better implementation may use the 3rd(980), whereas UEs with worse implementation may use the 4th(990).

[0119] Referring now to FIG. 10, illustrated is an example of UE operation according to an example embodiment of the present disclosure, for example where a UE is configured to triggerreporting in response to Event-2, with a threshold of 3 dB, and the network sending eight SSBs with periodicity of 20 ms (1005). In this example, SSB#2 is the current beam (1010), and all the other SSBs are configured by the network as new beams, i.e., they may all trigger Event-2. It may be assumed that for UEIBM the UE has been configured to report always 2 beams, the current beam (SSB#2 (1010) in this example), and the new beam triggering Event-2. Regarding the maximum delay for sending the UL indication in the first PUCCH channel, the starting reference point may be a symbol of a configured or predefined beam, here the current beam, that is always reported in the UEIBM report. The UL indication may be sent in the first PUCCH occasion Y ms after the starting reference point.

[0120] In the example of FIG. 10, first the UE may measure SSB#2 (1010) having RSRP of -85 dBm and SSB#5 (1020), being the best among the remaining beams, having RSRP of -90 dBm. Then, because for example of changed channel conditions, the UE may still measure SSB#2 (1010) having RSRP of -85 dBm but SSB#5 (1020), being the best among the remaining beams, has now RSRP of -80 dBm. Such new measurements may trigger Event-2 (1040). The starting reference point may then be determined by the UE to be a symbol of the last transmission of SSB#2 (1010).

[0121] In FIG. 10, it may be assumed that the UE is using, as the maximum delay, Y=5 ms (1050), either because the maximum delay is fixed or configured by the network, potentially based on a UE capability, and therefore the UE may transmit the UL indication in the 3rd (1060) PUCCH channel occasion (1030).

[0122] Referring now to FIG. 11, illustrated is an example of UE operation according to an example embodiment of the present disclosure, for example where a UE is configured to trigger reporting in response to Event-2, with a threshold of 3 dB, and the network sending eight SSBs with periodicity of 20 ms (1105). In this example, SSB#2 is the current beam (1110), and all the other SSBs are configured by the network as new beams, i.e., they may all trigger Event-2. It may be assumed that for UEIBM the UE has been configured to report always 2 beams, the current beam (SSB#2 (1110) in this example), and the new beam triggering Event-2. Regarding the maximum delay for sending the UL indication in the first PUCCH channel, the starting reference point may be a symbol of a configured or predefined beam, here the current beam, that is alwaysreported in the UEIBM report. The UL indication may be sent in the first PUCCH occasion Y ms after the starting reference point.

[0123] In the example of FIG. 11, first the UE may measure SSB#2 (1110) having RSRP of -85 dBm and SSB#5 (1120), being the best among the remaining beams, having RSRP of -90 dBm. Then, because for example of changed channel conditions, the UE may still measure SSB#2 (1110) having RSRP of -85 dBm but SSB#5 (1120), being the best among the remaining beams, has now RSRP of -80 dBm. Such new measurements may trigger Event-2 (1140). The starting reference point may then be determined by the UE to be ta symbol of the last transmission of SSB#2 (1110).

[0124] In FIG. 11, it may be assumed that the UE is using, as the maximum delay, Y=10 ms (1150), for example because the UE may be less capable than the UE in FIG. 10, and therefore the UE may transmit the UL indication in the 4th (1160) PUCCH channel occasion (1130).

[0125] FIG. 12 illustrates the potential steps of an example method 1200. The example method 1200 may include: receiving a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting, 1210; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal, 1220; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication, 1230. The example method 1200 may be performed, for example, with a UE.

[0126] FIG. 13 illustrates the potential steps of an example method 1300. The example method 1300 may include: transmitting, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event, 1310; and receiving theindication at a time that is based, at least partially, on the transmitted information, 1320. The example method 1300 may be performed, for example, with a base station, a gNB, a network, a network node, etc.

[0127] FIG. 14 illustrates the potential steps of an example method 1400. The example method 1400 may include: receiving a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting, 1410; determining that an event, of the at least one event, has been triggered, wherein the event is triggered with one or more reference signals, 1420; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication, 1430. The example method 1400 may be performed, for example, with a UE.

[0128] FIG. 15 illustrates the potential steps of an example method 1500. The example method 1500 may include: transmitting, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report, 1510; and receiving the indication at a time that is based, at least partially, on the transmitted information, 1520. The example method 1500 may be performed, for example, with a base station, a gNB, a network, a network node, etc.

[0129] In accordance with one example embodiment, an apparatus may comprise: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receive a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time may bedetermined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0130] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0131] The set of measured signals may comprise a plurality of signals triggering the event.

[0132] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the example apparatus.

[0133] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmittedwithin a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0134] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0135] Determining the time for transmitting the indication may comprise the example apparatus being further configured to at least one of: start a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; or start a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0136] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the example apparatus; determined based, at least partially, on at least one capability of the example apparatus; or determined based, at least partially, on a type of the event.

[0137] The example apparatus may be further configured to: transmit, to a network node, an indication of one or more maximum delay requirements the example apparatus supports, wherein the one or more maximum delay requirements may comprise, at least, the maximum delay requirement; and receive, from the network node, an indication of the maximum delay requirement.

[0138] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0139] The example apparatus may be further configured to: receive, from a network node, information associated with at least one of the symbol of the at least one reference signal, or themaximum delay requirement; and determine at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0140] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0141] The event may comprise a quality of a current beam being below a threshold value.

[0142] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0143] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0144] The example apparatus may be further configured to: transmit the indication based, at least partially, on the determined time.

[0145] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0146] The example apparatus may be further configured to: receive downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0147] The example apparatus may be further configured to: transmit the beam report.

[0148] The example apparatus may be further configured to: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancel transmission of the indication for the beam report.

[0149] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0150] In accordance with one aspect, an example method may be provided comprising: receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0151] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0152] The set of measured signals may comprise a plurality of signals triggering the event.

[0153] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the user equipment.

[0154] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0155] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0156] The determining of the time for transmitting the indication may comprise at least one of: starting a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; or starting a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0157] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the user equipment; determined based, at least partially, on at least one capability of the user equipment; or determined based, at least partially, on a type of the event.

[0158] The example method may further comprise: transmitting, to a network node, an indication of one or more maximum delay requirements the user equipment supports, wherein theone or more maximum delay requirements may comprise, at least, the maximum delay requirement; and receiving, from the network node, an indication of the maximum delay requirement.

[0159] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0160] The example method may further comprise: receiving, from a network node, information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determining at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0161] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0162] The event may comprise a quality of a current beam being below a threshold value.

[0163] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank.

[0164] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0165] The example method may further comprise: transmitting the indication based, at least partially, on the determined time.

[0166] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0167] The example method may further comprise: receiving downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0168] The example method may further comprise: transmitting the beam report.

[0169] The example method may further comprise: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancelling transmission of the indication for the beam report.

[0170] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0171] In accordance with one example embodiment, an apparatus may comprise: circuitry configured to perform: receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; circuitry configured to perform: determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and circuitry configured to perform: determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0172] In accordance with one example embodiment, an apparatus may comprise: processing circuitry; memory circuitry including computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable the apparatus to: receive a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbolof the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0173] As used in this application, the term “circuitry” or “means” may refer to one or more or all of the following: (a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and (b) combinations of hardware circuits and software, such as (as applicable): (i) a combination of analog and / or digital hardware circuit(s) with software / firmware and (ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.” This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

[0174] In accordance with one example embodiment, an apparatus may comprise means for: receiving a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0175] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal blockassociated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0176] The set of measured signals may comprise a plurality of signals triggering the event.

[0177] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the example apparatus.

[0178] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0179] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0180] The means configured for determining the time for transmitting the indication may comprise means configured for at least one of: starting a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; or starting a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0181] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the example apparatus; determined based, at least partially, on at least one capability of the example apparatus; or determined based, at least partially, on a type of the event.

[0182] The means may be further configured for: transmitting, to a network node, an indication of one or more maximum delay requirements the example apparatus supports, wherein the one or more maximum delay requirements may comprise, at least, the maximum delay requirement; and receiving, from the network node, an indication of the maximum delay requirement.

[0183] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0184] The means may be further configured for: receiving, from a network node, information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determining at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0185] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0186] The event may comprise a quality of a current beam being below a threshold value.

[0187] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank.

[0188] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0189] The means may be further configured for: transmitting the indication based, at least partially, on the determined time.

[0190] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0191] The means may be further configured for: receiving downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0192] The means may be further configured for: transmitting the beam report.

[0193] The means may be further configured for: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancelling transmission of the indication for the beam report.

[0194] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0195] A processor, memory, and / or example algorithms (which may be encoded as instructions, program, or code) may be provided as example means for providing or causing performance of operation.

[0196] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising instructions stored thereon which, when executed with at least one processor, cause the at least one processor to: cause receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0197] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising program instructions stored thereon for performing at least the following: causing receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0198] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and has a predetermined qualityrank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0199] The set of measured signals may comprise a plurality of signals triggering the event.

[0200] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the user equipment.

[0201] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0202] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0203] The program instructions for performing determining the time for transmitting the indication may comprise program instructions for performing at least one of: starting a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion afterexpiration of the timer; or starting a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0204] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the user equipment; determined based, at least partially, on at least one capability of the user equipment; or determined based, at least partially, on a type of the event.

[0205] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing transmitting, to a network node, of an indication of one or more maximum delay requirements the user equipment supports, wherein the one or more maximum delay requirements may comprise, at least, the maximum delay requirement; and causing receiving, from the network node, of an indication of the maximum delay requirement.

[0206] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0207] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing receiving, from a network node, of information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determining at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0208] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0209] The event may comprise a quality of a current beam being below a threshold value.

[0210] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configurationindicator state, that may be ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank.

[0211] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0212] The example computer-readable medium may further comprise program instructions stored thereon for performing: transmitting the indication based, at least partially, on the determined time.

[0213] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0214] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing receiving of downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0215] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing transmitting of the beam report.

[0216] The example computer-readable medium may further comprise program instructions stored thereon for performing: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancelling transmission of the indication for the beam report.

[0217] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0218] In accordance with another example embodiment, a (non-transitory) program storage device readable by a machine may be provided, tangibly embodying instructions executable by the machine for performing operations, the operations comprising: causing receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0219] In accordance with another example embodiment, a (non-transitory) computer- readable medium comprising instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: causing receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0220] A computer implemented system comprising: at least one processor and at least one (non-transitory) memory storing instructions that, when executed by the at least one processor, cause the system at least to perform: causing receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0221] A computer implemented system comprising: means for causing receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; means for determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with at least one reference signal; and means for determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

[0222] In accordance with one example embodiment, an apparatus may comprise: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: transmit, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receive the indication at a time that may be based, at least partially, on the transmitted information.

[0223] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an endof a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0224] The set of measured signals may comprise a plurality of signals triggering the event.

[0225] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0226] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0227] The example apparatus may be further configured to: receive, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and select the maximum delay requirement from the one or more maximum delay requirements.

[0228] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0229] The event may comprise a quality of a current beam being below a threshold value.

[0230] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configurationindicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0231] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0232] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0233] The example apparatus may be further configured to: transmit, to the at least one user equipment, downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0234] The example apparatus may be further configured to: determine whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0235] The example apparatus may be further configured to: receive the beam report.

[0236] The example apparatus may be further configured to: evaluate a quality of the beam report based, at least partially, on the time at which the indication was received.

[0237] The example apparatus may be further configured to: determine whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0238] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0239] In accordance with one aspect, an example method may be provided comprising: transmitting, with a network node to at least one user equipment, a configuration for performingevent based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receiving the indication at a time that may be based, at least partially, on the transmitted information.

[0240] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0241] The set of measured signals may comprise a plurality of signals triggering the event.

[0242] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols fromthe symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0243] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0244] The example method may further comprise: receiving, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and selecting the maximum delay requirement from the one or more maximum delay requirements.

[0245] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0246] The event may comprise a quality of a current beam being below a threshold value.

[0247] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0248] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0249] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0250] The example method may further comprise: transmitting, to the at least one user equipment, downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0251] The example method may further comprise: determining whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0252] The example method may further comprise: receiving the beam report.

[0253] The example method may further comprise: evaluating a quality of the beam report based, at least partially, on the time at which the indication was received.

[0254] The example method may further comprise: determining whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0255] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0256] In accordance with one example embodiment, an apparatus may comprise: circuitry configured to perform: transmitting, with a network node to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and circuitry configured to perform: receiving the indication at a time that may be based, at least partially, on the transmitted information.

[0257] In accordance with one example embodiment, an apparatus may comprise: processing circuitry; memory circuitry including computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable the apparatus to: transmit, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event fortriggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receive the indication at a time that may be based, at least partially, on the transmitted information.

[0258] In accordance with one example embodiment, an apparatus may comprise means for: transmitting, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receiving the indication at a time that may be based, at least partially, on the transmitted information.

[0259] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0260] The set of measured signals may comprise a plurality of signals triggering the event.

[0261] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0262] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0263] The means may be further configured for: receiving, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and selecting the maximum delay requirement from the one or more maximum delay requirements.

[0264] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0265] The event may comprise a quality of a current beam being below a threshold value.

[0266] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0267] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0268] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0269] The means may be further configured for: transmitting, to the at least one user equipment, downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0270] The means may be further configured for: determining whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0271] The means may be further configured for: receiving the beam report.

[0272] The means may be further configured for: evaluating a quality of the beam report based, at least partially, on the time at which the indication was received.

[0273] The means may be further configured for: determining whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0274] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0275] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising instructions stored thereon which, when executed with at least one processor, cause the at least one processor to: cause transmitting, with a network node to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of amaximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and cause receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0276] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising program instructions stored thereon for performing at least the following: causing transmitting, with a network node to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0277] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0278] The set of measured signals may comprise a plurality of signals triggering the event.

[0279] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0280] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0281] The example computer-readable medium may further comprise program instructions stored thereon for performing: receiving, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and selecting the maximum delay requirement from the one or more maximum delay requirements.

[0282] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0283] The event may comprise a quality of a current beam being below a threshold value.

[0284] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0285] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0286] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0287] The example computer-readable medium may further comprise program instructions stored thereon for performing: transmitting, to the at least one user equipment, downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0288] The example computer-readable medium may further comprise program instructions stored thereon for performing: determining whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0289] The example computer-readable medium may further comprise program instructions stored thereon for performing: receiving the beam report.

[0290] The example computer-readable medium may further comprise program instructions stored thereon for performing: evaluating a quality of the beam report based, at least partially, on the time at which the indication was received.

[0291] The example computer-readable medium may further comprise program instructions stored thereon for performing: determining whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0292] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0293] In accordance with another example embodiment, a (non-transitory) program storage device readable by a machine may be provided, tangibly embodying instructions executable by the machine for performing operations, the operations comprising: causing transmitting, with a network node to at least one user equipment, of a configuration for performing event based beamreporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0294] In accordance with another example embodiment, a (non-transitory) computer- readable medium comprising instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: causing transmitting, with a network node to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0295] A computer implemented system comprising: at least one processor and at least one (non-transitory) memory storing instructions that, when executed by the at least one processor, cause the system at least to perform: causing transmitting, with a network node to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0296] A computer implemented system comprising: means for causing transmitting, with a network node to at least one user equipment, of a configuration for performing event based beamreporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and means for causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0297] In accordance with one example embodiment, an apparatus may comprise: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receive a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0298] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal block associated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal received power, a channel state information reference signal associated with the beam with the best signal to interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0299] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the example apparatus.

[0300] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0301] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0302] Determining the time for transmitting the indication may comprise the example apparatus being further configured to at least one of: start a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; or start a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0303] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the example apparatus; determined based,at least partially, on at least one capability of the example apparatus; or determined based, at least partially, on a type of the event.

[0304] The example apparatus may be further configured to: transmit, to a network node, an indication of one or more maximum delay requirements the example apparatus supports, wherein the one or more maximum delay requirements may comprise, at least, the maximum delay requirement; and receive, from the network node, an indication of the maximum delay requirement.

[0305] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0306] The example apparatus may be further configured to: receive, from a network node, information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determine at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0307] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0308] The event may comprise a quality of a current beam being below a threshold value.

[0309] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0310] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0311] The example apparatus may be further configured to: transmit the indication based, at least partially, on the determined time.

[0312] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0313] The example apparatus may be further configured to: receive downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0314] The example apparatus may be further configured to: transmit the beam report.

[0315] The example apparatus may be further configured to: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancel transmission of the indication for the beam report.

[0316] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0317] In accordance with one aspect, an example method may be provided comprising: receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0318] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal blockassociated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal received power, a channel state information reference signal associated with the beam with the best signal to interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0319] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the user equipment.

[0320] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0321] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0322] The determining of the time for transmitting the indication may comprise at least one of: starting a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, whereinthe indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; or starting a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0323] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the user equipment; determined based, at least partially, on at least one capability of the user equipment; or determined based, at least partially, on a type of the event.

[0324] The example method may further comprise: transmitting, to a network node, an indication of one or more maximum delay requirements the user equipment supports, wherein the one or more maximum delay requirements may comprise, at least, the maximum delay requirement; and receiving, from the network node, an indication of the maximum delay requirement.

[0325] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0326] The example method may further comprise: receiving, from a network node, information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determining at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0327] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0328] The event may comprise a quality of a current beam being below a threshold value.

[0329] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configurationindicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0330] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0331] The example method may further comprise: transmitting the indication based, at least partially, on the determined time.

[0332] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0333] The example method may further comprise: receiving downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0334] The example method may further comprise: transmitting the beam report.

[0335] The example method may further comprise: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancelling transmission of the indication for the beam report.

[0336] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0337] In accordance with one example embodiment, an apparatus may comprise: circuitry configured to perform: receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; circuitry configured to perform: determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or morereference signals; and circuitry configured to perform: determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0338] In accordance with one example embodiment, an apparatus may comprise: processing circuitry; memory circuitry including computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable the apparatus to: receive a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0339] In accordance with one example embodiment, an apparatus may comprise means for: receiving a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0340] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal block associated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal received power, a channel state information reference signal associated with the beam with the best signalto interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0341] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the example apparatus.

[0342] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0343] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0344] The means configured for determining the time for transmitting the indication may comprise means configured for at least one of: starting a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; or starting a counter at the time of receiving the symbol of the at least one reference signal, wherein a valueof the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0345] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the example apparatus; determined based, at least partially, on at least one capability of the example apparatus; or determined based, at least partially, on a type of the event.

[0346] The means may be further configured for: transmitting, to a network node, an indication of one or more maximum delay requirements the example apparatus supports, wherein the one or more maximum delay requirements may comprise, at least, the maximum delay requirement; and receiving, from the network node, an indication of the maximum delay requirement.

[0347] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0348] The means may be further configured for: receiving, from a network node, information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determining at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0349] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0350] The event may comprise a quality of a current beam being below a threshold value.

[0351] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0352] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0353] The means may be further configured for: transmitting the indication based, at least partially, on the determined time.

[0354] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0355] The means may be further configured for: receiving downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0356] The means may be further configured for: transmitting the beam report.

[0357] The means may be further configured for: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, canceling transmission of the indication for the beam report.

[0358] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0359] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising instructions stored thereon which, when executed with at least one processor, cause the at least one processor to: cause receiving, with a user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least onereference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0360] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising program instructions stored thereon for performing at least the following: causing receiving, with a user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0361] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal block associated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal received power, a channel state information reference signal associated with the beam with the best signal to interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0362] The time may be determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the user equipment.

[0363] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication beless than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0364] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0365] The program instructions for performing determining the time for transmitting the indication may comprise program instructions for performing at least one of: starting a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; or starting a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter may be based, at least partially, on the maximum delay requirement, wherein the indication may be transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

[0366] The maximum delay requirement for transmission of the indication may be at least one of: obtained from a network node; pre-configured to the user equipment; determined based, at least partially, on at least one capability of the user equipment; or determined based, at least partially, on a type of the event.

[0367] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing transmitting, to a network node, of an indication of one or more maximum delay requirements the user equipment supports, wherein the one or moremaximum delay requirements may comprise, at least, the maximum delay requirement; and causing receiving, from the network node, of an indication of the maximum delay requirement.

[0368] The determined time may comprise a physical uplink control channel occasion during which the indication is to be transmitted.

[0369] The example computer-readable medium may further comprise program instructions stored thereon for performing: receiving, from a network node, information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determining at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

[0370] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0371] The event may comprise a quality of a current beam being below a threshold value.

[0372] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0373] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0374] The example computer-readable medium may further comprise program instructions stored thereon for performing: transmitting the indication based, at least partially, on the determined time.

[0375] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0376] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing receiving of downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0377] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing transmitting of the beam report.

[0378] The example computer-readable medium may further comprise program instructions stored thereon for performing: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancelling transmission of the indication for the beam report.

[0379] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0380] In accordance with another example embodiment, a (non-transitory) program storage device readable by a machine may be provided, tangibly embodying instructions executable by the machine for performing operations, the operations comprising: causing receiving, with a user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0381] In accordance with another example embodiment, a (non-transitory) computer- readable medium comprising instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: causing receiving, with a user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, anindication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0382] A computer implemented system comprising: at least one processor and at least one (non-transitory) memory storing instructions that, when executed by the at least one processor, cause the system at least to perform: causing receiving, with a user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0383] A computer implemented system comprising: means for causing receiving, with a user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise, at least, an indication of at least one event for triggering beam reporting; means for determining that an event, of the at least one event, has been triggered, wherein the event may be triggered with one or more reference signals; and means for determining a time for transmitting an indication for a beam report triggered with the event, wherein the time may be determined based, at least partially, on a symbol of at least one reference signal included in the beam report, and a maximum delay requirement for transmission of the indication.

[0384] In accordance with one example embodiment, an apparatus may comprise: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: transmit, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: anindication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and receive the indication at a time that may be based, at least partially, on the transmitted information.

[0385] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal block associated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal received power, a channel state information reference signal associated with the beam with the best signal to interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0386] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0387] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0388] The example apparatus may be further configured to: receive, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and select the maximum delay requirement from the one or more maximum delay requirements.

[0389] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0390] The event may comprise a quality of a current beam being below a threshold value.

[0391] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0392] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0393] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0394] The example apparatus may be further configured to: transmit, to the at least one user equipment, downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0395] The example apparatus may be further configured to: determine whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0396] The example apparatus may be further configured to: receive the beam report.

[0397] The example apparatus may be further configured to: evaluate a quality of the beam report based, at least partially, on the time at which the indication was received.

[0398] The example apparatus may be further configured to: determine whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0399] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0400] In accordance with one aspect, an example method may be provided comprising: transmitting, with a network node to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and receiving the indication at a time that may be based, at least partially, on the transmitted information.

[0401] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal block associated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal received power, a channel state information reference signal associated with the beam with the best signal to interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronizationsignal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0402] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0403] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0404] The example method may further comprise: receiving, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and selecting the maximum delay requirement from the one or more maximum delay requirements.

[0405] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0406] The event may comprise a quality of a current beam being below a threshold value.

[0407] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0408] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0409] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0410] The example method may further comprise: transmitting, to the at least one user equipment, downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0411] The example method may further comprise: determining whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0412] The example method may further comprise: receiving the beam report.

[0413] The example method may further comprise: evaluating a quality of the beam report based, at least partially, on the time at which the indication was received.

[0414] The example method may further comprise: determining whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0415] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0416] In accordance with one example embodiment, an apparatus may comprise: circuitry configured to perform: transmitting, with a network node to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information fortransmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and circuitry configured to perform: receiving the indication at a time that may be based, at least partially, on the transmitted information.

[0417] In accordance with one example embodiment, an apparatus may comprise: processing circuitry; memory circuitry including computer program code, the memory circuitry and the computer program code configured to, with the processing circuitry, enable the apparatus to: transmit, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and receive the indication at a time that may be based, at least partially, on the transmitted information.

[0418] In accordance with one example embodiment, an apparatus may comprise means for: transmitting, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and receiving the indication at a time that may be based, at least partially, on the transmitted information.

[0419] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal block associated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal receivedpower, a channel state information reference signal associated with the beam with the best signal to interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0420] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0421] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0422] The means may be further configured for: receiving, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and selecting the maximum delay requirement from the one or more maximum delay requirements.

[0423] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0424] The event may comprise a quality of a current beam being below a threshold value.

[0425] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0426] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0427] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0428] The means may be further configured for: transmitting, to the at least one user equipment, downlink control information, wherein the downlink control information may comprise, at least, an uplink resource grant for transmitting the beam report.

[0429] The means may be further configured for: determining whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0430] The means may be further configured for: receiving the beam report.

[0431] The means may be further configured for: evaluating a quality of the beam report based, at least partially, on the time at which the indication was received.

[0432] The means may be further configured for: determining whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0433] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0434] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising instructions stored thereon which, when executed with at least one processor, cause the at least one processor to: cause transmitting, to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and cause receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0435] In accordance with one example embodiment, a (non-transitory) computer-readable medium comprising program instructions stored thereon for performing at least the following: causing transmitting, to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0436] The at least one reference signal may comprise at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a beam with a best reference signal received power, a synchronization signal block associated with a beam with a best signal to interference plus noise ratio, a channel state information reference signal associated with the beam with the best reference signal received power, a channel state information reference signal associated with the beam with the best signal to interference plus noise ratio, a synchronization signal block associated with a beam with a best quality, a channel state information reference signal associated with the beam with the best quality, a synchronization signal block with a largest periodicity, a channel state information reference signal with a largest periodicity, a synchronization signal block at an end of a synchronizationsignal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

[0437] The maximum delay requirement may comprise at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

[0438] The delay between the symbol of the at least one reference signal and transmission of the indication may comprise at least one of a number of symbols, or an amount of time.

[0439] The example computer-readable medium may further comprise program instructions stored thereon for performing: receiving, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and selecting the maximum delay requirement from the one or more maximum delay requirements.

[0440] The event may comprise a quality of at least one new beam being better than a quality of a current beam by a threshold value.

[0441] The event may comprise a quality of a current beam being below a threshold value.

[0442] The event may comprise a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that may be ranked in an active transmission configuration indicator state list according to quality and have a predetermined quality rank.

[0443] The event may comprise a reoccurrence of the event after a predetermined number of instances of the event have occurred.

[0444] The indication may comprise at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

[0445] The example computer-readable medium may further comprise program instructions stored thereon for performing: causing transmitting, to the at least one user equipment, of downlink control information, wherein the downlink control information comprises, at least, an uplink resource grant for transmitting the beam report.

[0446] The example computer-readable medium may further comprise program instructions stored thereon for performing: determining whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

[0447] The example computer-readable medium may further comprise program instructions stored thereon for performing: receiving the beam report.

[0448] The example computer-readable medium may further comprise program instructions stored thereon for performing: evaluating a quality of the beam report based, at least partially, on the time at which the indication was received.

[0449] The example computer-readable medium may further comprise program instructions stored thereon for performing: determining whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

[0450] The symbol of the at least one reference signal may comprise at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

[0451] In accordance with another example embodiment, a (non-transitory) program storage device readable by a machine may be provided, tangibly embodying instructions executable by the machine for performing operations, the operations comprising: causing transmitting, to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0452] In accordance with another example embodiment, a (non-transitory) computer- readable medium comprising instructions that, when executed by an apparatus, cause the apparatus to perform at least the following: causing transmitting, to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0453] A computer implemented system comprising: at least one processor and at least one (non-transitory) memory storing instructions that, when executed by the at least one processor, cause the system at least to perform: causing transmitting, to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and causingreceiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0454] A computer implemented system comprising: means for causing transmitting, to at least one user equipment, of a configuration for performing event based beam reporting, wherein the configuration may comprise at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information may comprise an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal included in the beam report; and means for causing receiving of the indication at a time that may be based, at least partially, on the transmitted information.

[0455] The term “non-transitory,” as used herein, is a limitation of the medium itself (i.e. tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM).

[0456] It should be understood that the foregoing description is only illustrative. Various alternatives and modifications can be devised by those skilled in the art. For example, features recited in the various dependent claims could be combined with each other in any suitable combination(s). In addition, features from different embodiments described above could be selectively combined into a new embodiment. Accordingly, the description is intended to embrace all such alternatives, modification and variances which fall within the scope of the appended claims.

Claims

1. CLAIMSWhat is claimed is:

1. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus at least to: receive a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting; determine that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal; and determine a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

2. The apparatus of claim 1 , wherein the at least one reference signal comprises at least one of: a synchronization signal block, a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam,a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that is ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

3. The apparatus of claim 2, wherein the set of measured signals comprises a plurality of signals triggering the event.

4. The apparatus of any of claims 1 through 3, wherein the time is determined based, at least partially, on a time at which the symbol of the at least one reference signal is received with the apparatus.

5. The apparatus of any of claims 1 through 4, wherein the maximum delay requirement comprises at least one of: a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event;a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

6. The apparatus of claim 5, wherein the delay between the symbol of the at least one reference signal and transmission of the indication comprises at least one of a number of symbols, or an amount of time.

7. The apparatus of any of claims 1 through 6, wherein determining the time for transmitting the indication comprises the instructions, when executed with the at least one processor, cause the apparatus to at least one of: start a timer at a time of receiving the symbol of the at least one reference signal, wherein a length of the timer is based, at least partially, on the maximum delay requirement, wherein the indication is transmitted at least one of: before expiration of the timer, or in a first uplink occasion after expiration of the timer; orstart a counter at the time of receiving the symbol of the at least one reference signal, wherein a value of the counter is based, at least partially, on the maximum delay requirement, wherein the indication is transmitted at least one of: before the value of the counter is zero, or in a first uplink occasion after the value of the counter is zero.

8. The apparatus of any of claims 1 through 7, wherein the maximum delay requirement for transmission of the indication is at least one of: obtained from a network node; pre-configured to the apparatus; determined based, at least partially, on at least one capability of the apparatus; or determined based, at least partially, on a type of the event.

9. The apparatus of any of claims 1 through 8, wherein the instructions, when executed with the at least one processor, cause the apparatus to: transmit, to a network node, an indication of one or more maximum delay requirements the apparatus supports, wherein the one or more maximum delay requirements comprises, at least, the maximum delay requirement; and receive, from the network node, an indication of the maximum delay requirement.

10. The apparatus of any of claims 1 through 9, wherein the determined time comprises a physical uplink control channel occasion during which the indication is to be transmitted.

11. The apparatus of any of claims 1 through 10, wherein the instructions, when executed with the at least one processor, cause the apparatus to:receive, from a network node, information associated with at least one of the symbol of the at least one reference signal, or the maximum delay requirement; and determine at least one of the symbol of the at least one reference signal, or the maximum delay requirement based, at least partially, on the received information.

12. The apparatus of any of claims 1 through 11, wherein the event comprises a quality of at least one new beam being better than a quality of a current beam by a threshold value.

13. The apparatus of any of claims 1 through 11, wherein the event comprises a quality of a current beam being below a threshold value.

14. The apparatus of any of claims 1 through 11, wherein the event comprises a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that is ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank.

15. The apparatus of any of claims 1 through 14, wherein the event comprises a reoccurrence of the event after a predetermined number of instances of the event have occurred.

16. The apparatus of any of claims 1 through 15, wherein the instructions, when executed with the at least one processor, cause the apparatus to: transmit the indication based, at least partially, on the determined time.

17. The apparatus of claim 16, wherein the indication comprises at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, ora notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

18. The apparatus of any of claims 1 through 17, wherein the instructions, when executed with the at least one processor, cause the apparatus to: receive downlink control information, wherein the downlink control information comprises, at least, an uplink resource grant for transmitting the beam report.

19. The apparatus of any of claims 1 through 18, wherein the instructions, when executed with the at least one processor, cause the apparatus to: transmit the beam report.

20. The apparatus of any of claims 1 through 19, wherein the instructions, when executed with the at least one processor, cause the apparatus to: in response to a determination that a time for transmitting the indication for the beam report cannot be determined based, at least partially, on the maximum delay requirement, cancel transmission of the indication for the beam report.

21. The apparatus of any of claims 1 through 20, wherein the symbol of the at least one reference signal comprises at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

22. A method comprising: receiving, with a user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises, at least, an indication of at least one event for triggering beam reporting;determining that an event, of the at least one event, has been triggered, wherein the event is triggered with at least one reference signal; and determining a time for transmitting an indication for a beam report triggered with the event, wherein the time is determined based, at least partially, on a symbol of the at least one reference signal and a maximum delay requirement for transmission of the indication.

23. An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed with the at least one processor, cause the apparatus at least to: transmit, to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receive the indication at a time that is based, at least partially, on the transmitted information.

24. The apparatus of claim 23, wherein the at least one reference signal comprises at least one of: a synchronization signal block,a channel state information reference signal, a synchronization signal block associated with a current beam, a channel state information reference signal associated with the current beam, a synchronization signal block associated with a new beam, a channel state information reference signal associated with the new beam, a synchronization signal block, associated to an active transmission configuration indicator state, that is ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank, a channel state information reference signal, associated to an active transmission configuration indicator state, with the predetermined quality rank, a synchronization signal block with a largest periodicity of a set of measured signals, a channel state information reference signal with a largest periodicity of the set of measured signals, a synchronization signal block at an end of a synchronization signal block burst, a synchronization signal block at an end of a first time window, or a channel state information reference signal at an end of a second time window.

25. The apparatus of claim 24, wherein the set of measured signals comprises a plurality of signals triggering the event.

26. The apparatus of any of claims 23 through 25, wherein the maximum delay requirement comprises at least one of:a requirement that a delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of the at least one reference signal triggering the event; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a smallest periodicity of at least one reference signal reported in the beam report; a requirement that the delay between the symbol of the at least one reference signal and transmission of the indication be less than or equal to a predetermined value; a requirement that the indication be transmitted within a defined number of symbols from the symbol of the at least one reference signal; a requirement that the indication be transmitted within a defined time window from the symbol of the at least one reference signal; or a requirement that the indication be transmitted in a first physical uplink control channel occasion after the delay.

27. The apparatus of claim 26, wherein the delay between the symbol of the at least one reference signal and transmission of the indication comprises at least one of a number of symbols, or an amount of time.

28. The apparatus of any of claims 23 through 27, wherein the instructions, when executed with the at least one processor, cause the apparatus to: receive, from the at least one user equipment, an indication of one or more maximum delay requirements the at least one user equipment supports; and select the maximum delay requirement from the one or more maximum delay requirements.

29. The apparatus of any of claims 23 through 28, wherein the event comprises a quality of at least one new beam being better than a quality of a current beam by a threshold value.

30. The apparatus of any of claims 23 through 28, wherein the event comprises a quality of a current beam being below a threshold value.

31. The apparatus of any of claims 23 through 28, wherein the event comprises a quality of at least one new beam being better, by a threshold value, than a reference signal, associated to an active transmission configuration indicator state, that is ranked in an active transmission configuration indicator state list according to quality and has a predetermined quality rank.

32. The apparatus of any of claims 23 through 31, wherein the event comprises a reoccurrence of the event after a predetermined number of instances of the event have occurred.

33. The apparatus of any of claims 23 through 32, wherein the indication comprises at least one of: an uplink indication transmitted in a physical uplink control channel, a request for an uplink resource grant for transmitting the beam report, or a notification of at least one preconfigured uplink resource to be used for transmitting the beam report.

34. The apparatus of any of claims 23 through 33, wherein the instructions, when executed with the at least one processor, cause the apparatus to: transmit, to the at least one user equipment, downlink control information, wherein the downlink control information comprises, at least, an uplink resource grant for transmitting the beam report.

35. The apparatus of any of claims 23 through 34, wherein the instructions, when executed with the at least one processor, cause the apparatus to: determine whether to grant uplink resources to the at least one user equipment based, at least partially, on the time at which the indication was received.

36. The apparatus of any of claims 23 through 35, wherein the instructions, when executed with the at least one processor, cause the apparatus to: receive the beam report.

37. The apparatus of claim 36, wherein the instructions, when executed with the at least one processor, cause the apparatus to: evaluate a quality of the beam report based, at least partially, on the time at which the indication was received.

38. The apparatus of any of claims 23 through 37, wherein the instructions, when executed with the at least one processor, cause the apparatus to: determine whether to cause beam switching for the at least one user equipment based, at least partially, on the time at which the indication was received.

39. The apparatus of any of claims 23 through 38, wherein the symbol of the at least one reference signal comprises at least one of: a last symbol of the at least one reference signal, a first symbol of the at least one reference signal, or a predetermined symbol of the at least one reference signal.

40. A method comprising:transmitting, with a network node to at least one user equipment, a configuration for performing event based beam reporting, wherein the configuration comprises at least: an indication of at least one event for triggering beam reporting, and information for transmitting an indication of a beam report triggered with an event of the at least one event, wherein the information comprise, at least, an indication of a maximum delay requirement for transmitting the indication after a symbol of at least one reference signal triggering the event; and receiving the indication at a time that is based, at least partially, on the transmitted information.

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