Event-triggered measurement reporting

Abstract

Example embodiments of the present disclosure are directed to event-triggered measurement reporting. In a method, a first apparatus receives, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi- persistently or aperiodically. The first apparatus determines an activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically; and determines whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

Description

EVENT-TRIGGERED MEASUREMENT REPORTINGFIELD

[0001] Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for event-triggered measurement reporting.BACKGROUND

[0002] A communication network may serve as a facility that enables communications between two or more communication devices or provides communication devices access to a data network. A mobile or wireless communication network is one example of a communication network. A communication device may be provided with a service by an application server.

[0003] The communication network may operate in accordance with standards such as those provided by Third Generation Partnership Project (3 GPP) or European Telecommunications Standards Institute (ETSI). Examples of standards provided by 3 GPP are the so-called 3 GPP standards for cellular technology generations, such as 3 GPP standards for 4G technology, 5G technology, 6G technology etc.SUMMARY

[0004] In a first aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus at least to: receive, from a second apparatus, an event -triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; in accordance with a determination that a downlink control message indicating an activation of the RS is received, determine to start performing an event-triggered measurement reporting procedure using the RS; and in accordance with a determination that a downlink control message indicating a deactivation of the RS is received, determine to stop performing the event-triggered measurement reporting procedure using the RS.

[0005] In a second aspect of the present disclosure, there is provided a second apparatus.The second apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus at least to: transmit, to a first apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; and transmit a downlink control message indicating an activation of the RS to the first apparatus without transmitting a further message for an activation of an event-triggered measurement reporting procedure, or transmit a downlink control message indicating a deactivation of the RS to the first apparatus without transmitting a further message for a deactivation of an event-triggered measurement reporting procedure.

[0006] In a third aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; in accordance with a determination that a downlink control message indicating an activation of the RS is received, determining to start performing an event-triggered measurement reporting procedure using the RS; and in accordance with a determination that a downlink control message indicating a deactivation of the RS is received, determining to stop performing the event -triggered measurement reporting procedure using the RS.

[0007] In a fourth aspect of the present disclosure, there is provided a method. The method comprises: transmitting, to a first apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; and transmitting a downlink control message indicating an activation of the RS to the first apparatus without transmitting a further message for an activation of an event-triggered measurement reporting procedure, or transmitting a downlink control message indicating a deactivation of the RS to the first apparatus without transmitting a further message for a deactivation of an event-triggered measurement reporting procedure.

[0008] In a fifth aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises means for receiving, from a second apparatus, an event- triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently oraperiodically; means for in accordance with a determination that a downlink control message indicating an activation of the RS is received, determining to start performing an event-triggered measurement reporting procedure using the RS; and means for in accordance with a determination that a downlink control message indicating a deactivation of the RS is received, determining to stop performing the event-triggered measurement reporting procedure using the RS.

[0009] In a sixth aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises means for transmitting, to a first apparatus, an event- triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; and means for transmitting a downlink control message indicating an activation of the RS to the first apparatus without transmitting a further message for an activation of an event-triggered measurement reporting procedure, or means for transmitting a downlink control message indicating a deactivation of the RS to the first apparatus without transmitting a further message for a deactivation of an event-triggered measurement reporting procedure.

[0010] In a seventh aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the third or fourth aspect.

[0011] In an eighth aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus at least to: receive, from a second apparatus, an event -triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; determine an activation status of the RS set based on the RS configured to be activated semi- persistently or aperiodically; and determine whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

[0012] In a ninth aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises at least one processor; and at least one memory storinginstructions that, when executed by the at least one processor, cause the second apparatus at least to: receive, from a first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi -persistently or aperiodically; and transmit, to the first apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi-persistently or aperiodically.

[0013] In a tenth aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi-persistently or aperiodically; determining an activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically; and determining whether to perform an event -triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

[0014] In an eleventh aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi-persistently or aperiodically; and transmitting, to the first apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi- persistently or aperiodically.

[0015] In a twelfth aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises means for receiving, from a second apparatus, an event- triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi-persistently or aperiodically; means for determining an activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically; and means for determining whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

[0016] In a thirteenth aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises means for receiving, from a first apparatus, acapability indication of a capability to perform event-triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi -persistently or aperiodically; and means for transmitting, to the first apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi -persistently or aperiodically.

[0017] In a fourteenth aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the tenth or eleventh aspect.

[0018] It is to be understood that the Summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Some example embodiments will now be described with reference to the accompanying drawings, where:

[0020] FIG. 1 illustrates a signaling flow for an example LTM procedure in a communication system;

[0021] FIG. 2 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented;

[0022] FIG. 3 illustrates a signaling flow for an example process of event-triggered measurement reporting linked with RS activation / deactivation according to some example embodiments of the present disclosure;

[0023] FIG. 4 illustrates a signaling flow for an example process of event-triggered measurement reporting based on an activation status of a RS set according to some example embodiments of the present disclosure;

[0024] FIG. 5 illustrates a signaling flow for an example process of event-triggered measurement reporting according to some example embodiments of the present disclosure;

[0025] FIG. 6 illustrates a signaling flow for another example process of event -triggered measurement reporting according to some example embodiments of the present disclosure;

[0026] FIG. 7 illustrates a flowchart of a method implemented at a first apparatus in accordance with some example embodiments of the present disclosure;

[0027] FIG. 8 illustrates a flowchart of a method implemented at a second apparatus in accordance with some example embodiments of the present disclosure;

[0028] FIG. 9 illustrates a flowchart of another method implemented at a first apparatus in accordance with some example embodiments of the present disclosure;

[0029] FIG. 10 illustrates a flowchart of another method implemented at a second apparatus in accordance with some example embodiments of the present disclosure;

[0030] FIG. 11 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure; and

[0031] FIG. 12 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.

[0032] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION

[0033] Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein can be implemented in various manners other than the ones described below.

[0034] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

[0035] References in the present disclosure to “one embodiment,” “an embodiment,” “an example embodiment,” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it issubmitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

[0036] It shall be understood that although the terms “first,” “second,”..., etc. in front of noun(s) and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another and they do not limit the order of the noun(s). For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.

[0037] As used herein, “at least one of the following: ” and “at least one of ” and similar wording, where the list of two or more elements are joined by “and” or “or”, mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.

[0038] As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.

[0039] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “has”, “having”, “includes” and / or “including”, when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0040] As used in this application, the term “circuitry” 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) withsoftware / 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.

[0041] 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.

[0042] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G), the second generation (2G), 2.5G, 2.75G, the third generation (3G), the fourth generation (4G), 4.5G, the fifth generation (5G), 5.5G, the sixth generation (6G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.

[0043] As used herein, the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. The network device may refer to a base station (BS) or an access point (AP), for example, a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), an NR NB (also referred to as a gNB), a Remote Radio Unit (RRU), a radio header (RH), a remote radio head (RRH), a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology. In some example embodiments, radio access network (RAN) split architecture comprises a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node. An IAB node comprises a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.

[0044] The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE), a Subscriber Station (SS), a Portable Subscriber Station, a Mobile Station (MS), or an Access Terminal (AT). The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA), portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE), laptop-mounted equipment (LME), USB dongles, smart devices, wireless customer-premises equipment (CPE), an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD), a vehicle, a drone, a medical device and applications (e.g., remote surgery), an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts), a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. The terminal device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node). In the following description, the terms “terminal device”, “communication device”, “terminal”, “user equipment” and “UE” may be usedinterchangeably.

[0045] As used herein, the term “resource,” “transmission resource,” “resource block,” “physical resource block” (PRB), “uplink resource,” or “downlink resource” may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other combination of the time, frequency, space and / or code domain resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.

[0046] Currently, event-triggered measurement reporting may be used in various scenarios such as Layer 1 or Layer 2 (L1 / L2) triggered mobility (LTM) and beam management (BM), e.g., UE-initiated / event-driven BM in Multiple-Input Multiple- Output (MIMO). Such event-triggered measurement reporting may also be referred to as event-triggered LI measurement reporting.

[0047] In the LTM scenario, an LI LTM measurement event configuration may be associated with an LI measurement resource configuration provided in an LTM configuration via radio resource control (RRC) signaling. Any beam associated with a RS in a candidate RS configuration may be used for LTM event evaluation. A beam refers to a RS (e.g., synchronization signal block (SSB) or channel state information (CSI) -RS). The measurement on a beam refers to the measurement using the RS associated with the beam. In some cases, a beam is referred to as a transmission configuration indicator (TCI) state, and the measurement using the beam refers to the measurements using the RS associated with the TCI state.

[0048] For the purpose of discussion, an example LTM procedure is illustrated in FIG. 1. FIG. 1 illustrates a signaling flow 100 for an LTM procedure in a communication system. Without loss of generality, the signaling flow 100 involves a terminal device 150 and a network node 152 (e.g., a gNB) which serves the terminal device 150. As shown in FIG. 1, an LTM procedure may split in four phases, including an LTM preparation phase 103, an early synchronization phase 107, an LTM execution phase 111, and an LTMcompletion phase 116.

[0049] During the LTM preparation phase 103, at 101, the terminal device 150 is in a RRC connected (RRC Connected) state. At 102, the terminal device 150 transmits a measurement report to the network node 152 containing the measurement results for neighboring cells. At 103, the network node 152 (e.g., the serving CU of the network node) decides to configure LTM and initiates LTM candidate preparation. The network node 152 performs the LTM candidate preparations by identifying the potential targets based on the measurement report and preparing candidate target cells (or referred to as “target cells” for short). At 105, the network node 152 shares the LTM candidate configuration (which includes target cell configurations) with the terminal device 150. The network node 152 transmits an RRCReconfiguration message to the terminal device 150 including the LTM candidate configurations. At 106, the terminal device 150 stores the LTM candidate configurations and transmits a RRC reconfiguration complete message to the network node 152.

[0050] During the early synchronization phase 107, at 108 A, the terminal device 150 performs downlink (DL) synchronization with the candidate cell(s) before receiving the cell switch command. At 108B, the terminal device 150 performs uplink (UL) synchronization with the candidate cell(s).

[0051] During the LTM execution phase 111, at 110, the terminal device 150 performs LI measurements on the configured candidate cell(s) and transmits a LI measurement report to the network node 152. The LI measurements should be performed as long as RRC reconfiguration (at 105) is applicable. At 112, the network node 152 (e.g., the serving DU) makes an LTM decision on a target cell by considering the LI measurements on the target cell) and transmits, at 113, a cell switch command to the terminal device 150. The cell switch command may be transmitted in a MAC CE. At 114, the terminal device 150 detaches from the source cell and applies the target configuration corresponding to the target cell that is received previously. At 115, if the terminal device 150 does not have a valid TA of the target cell, the terminal device 150 switches to that target cell through a random access channel (RACH) procedure and starts receiving data from the target cell. During the completion phase 116, at 117, the terminal device 150 completes the LTM cell switch procedure by sending RRCReconfigurationComplete message to target cell.

[0052] In the BM scenario, RS(s) for new beam(s) may be explicitly configured in one RS resource set associated with an CSI reporting configuration. Thus, the new beam(s) may be used for measurements and event evaluation.

[0053] In 3GPP Release 19, the event-triggered measurement reporting is being considered for LI measurement reporting for both BM (for MIMO purposes) and LTM (for cell switch purposes), where the UE may be configured with events to determine when to send a report containing one or more LI measurements.

[0054] For event -triggered LI measurement reporting, an event may be configured where the UE is required to evaluate the quality of a candidate beam / RS (e.g., for LTM this would be an RS transmitted from a candidate cell) against a threshold, or the quality of the current beam (RS associated with the current beam) being used by the UE in the current serving cell.

[0055] For both UE-initiated BM and LTM, it has been agreed that candidate beams / RSs used for event evaluation may be configured to the UE as part of the event-triggered reporting configuration.

[0056] Note that, in certain scenarios, some beam / RSs may be activated dynamically, for example semi-persistent CSI-RSs or aperiodic RSs. In this specification, the term “RS activated dynamically” may refer to semi-persistent (SP) RS or aperiodic (also referred to as non-periodic) RS. This dynamic activation may be used to enable, for example, beam measurements with more refined beams determined based on the UE measurements on other RSs (e.g., periodic RSs). In some other examples, new RS / beams may need to be activated for measurements and reporting due to the UE mobility. In certain scenarios, the configuration details of RSs may be provided before, e.g., as a part of the RRC configuration. Then an additional downlink control command (e.g., medium access control (MAC) control element (CE) or downlink control information (DCI)) may be used to indicate the activation or deactivation (for an activated RS) of a configured RS. The UE may expect that the activated RS is available (or transmitted) for measurements if needed. Similarly, after the deactivation of an activated RS, the UE may expect that the deactivated RS is not available (or not transmitted) for measurements if needed. The event-triggered measurement reporting framework may be associated with such RSs.

[0057] Currently, the event -triggered reporting for LI measurements may be configured as part of the RRC configuration. After the RRC configuration is received, themeasurements, evaluation, and reporting may be assumed as activated. However, if one or more RS(s) configured / associated with the event-triggered reporting is to be activated dynamically, such as semi-persistent CSI-RSs or aperiodic RSs, a mechanism of event- triggered measurement reporting in such case has not been defined. For example, the timing / activation of the event-triggered measurement reporting needs to be clarified, especially for a case where the one or more RS(s) has not been activated yet.

[0058] Example embodiments of the present disclosure propose solutions for event- triggered measurement reporting. In one solution, a first apparatus receives, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated dynamically (e.g., semi-persistently or aperiodically). In accordance with a determination that a downlink control message containing the information indicating an activation of the RS is received, the first apparatus determines to start performing an event-triggered measurement reporting procedure using the RS. In accordance with a determination that a downlink control message containing the information indicating a deactivation of the RS is received, the first apparatus determines to stop performing the event-triggered measurement reporting procedure using the RS.

[0059] With this solution, for the RS configured be activated semi-persistently or aperiodically, the first apparatus can determine to start / stop performing the event- triggered measurement reporting procedure upon receiving the downlink control message indicating the activation / deactivation of the RS. Thus, a mechanism of event-triggered measurement reporting based on measurements using a SP RS or AP RS is defined.

[0060] In another solution, a first apparatus receives, from a second apparatus, an event- triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi-persistently or aperiodically. The first apparatus further determines an activation status of the RS set (i.e., RS set may be the measurement RS set containing the RSs configured for measurements for event evaluation and reporting for event-triggered reporting) based on the RS configured to be activated semi-persistently or aperiodically, and determines whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

[0061] With this solution, the activation status of the RS set is determined based on theRS configured to be activated semi-persistently or aperiodically and the activation status of the RS is used for determining whether to perform the event -triggered measurement reporting procedure using at least one RS in the RS set. Thus, a mechanism of event- triggered measurement reporting based on measurements using a SP RS or AP RS is defined.

[0062] Several solutions of the present disclosure have been briefly described. Principle and implementations of the present disclosure will be described in detail below with reference to the accompany drawings. It will be appreciated that acts, steps, processes, and / or flowcharts illustrated in the drawings are only examples without suggesting any limitation. For example, the steps may be performed in any suitable manner. The steps as illustrated in one or more drawings may be selectively performed in an actual implementation. Moreover, example embodiments described with reference to the drawings may be implemented separately or combined in any suitable manner. For example, one or more example embodiments shown in a single drawing may be combined with one or more example embodiments shown in one or more other drawings.

[0063] Reference is now made to FIG. 2. FIG. 2 illustrates an example communication environment 200 in which example embodiments of the present disclosure can be implemented. As shown in FIG. 2, the communication environment 200 may comprise one or more network devices, such as a network device 210-1, a network device 210-2, and one or more terminal devices such as a terminal device 220. For purpose of discussion, the network device 210-1 and network device 210-2 may be collectively referred to as network devices 210 or individually referred to as network device 210.

[0064] In some example embodiments, the network device 210-1 may be a radio access network (RAN) network device of a serving cell 240, for example, a gNB of the serving cell 240 for the terminal device 220. The network device 210-2 may be a RAN network device of a neighbor cell 250, for example, a gNB of the cell 250. In some embodiments, the cell 250 may be a candidate cell for LTM of the terminal device 220. The terminal device 220, for example, may be a UE served by the serving cell 240. The cell 250 may be a potential candidate to become a new serving cell for the terminal device 220.

[0065] It is to be understood that the number of devices and their connections shown in FIG. 2 are only for the purpose of illustration without suggesting any limitation. The communication environment 200 may include any suitable number of devices configuredto implement example embodiments of the present disclosure. Although not shown, it would be appreciated that one or more additional devices may be deployed in the communication environment 200. Although illustrated as a base station, the network device 210 may be or may be comprised in any other suitable network device. Although illustrated as a UE, the terminal device 220 may be or may be comprised in any other suitable terminal device.

[0066] In the following, for the purpose of illustration, some example embodiments are described with the terminal device 220 operating as a UE and the network device 210 operating as a base station. However, in some example embodiments, operations described in connection with a terminal device may be implemented at a network device or other device, and operations described in connection with a network device may be implemented at a terminal device or other device.

[0067] In some example embodiments, a communication direction from the network device 210 to the terminal device 220 is referred to as a downlink (DL), and a communication direction from the terminal device 220 to a network device 210 is referred to as an uplink (UL). In DL, the network device 210 is a transmitting (TX) device (or a transmitter) and the terminal device 220 is a receiving (RX) device (or a receiver). In UL, the terminal device 220 is a TX device (or a transmitter) and the network device 210 is a RX device (or a receiver).

[0068] Communications in the communication environment 200 may be implemented according to any proper communication protocol(s), comprising, but not limited to, cellular communication protocols, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex (TDD), Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Division Multiple (OFDM), Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and / or any other technologies currently known or to be developed in the future.

[0069] FIG. 3 illustrates a signaling flow for an example process 300 of event -triggeredmeasurement reporting linked with RS activation / deactivation according to some example embodiments of the present disclosure. As illustrated in FIG. 3, the process 300 involves a terminal apparatus 301 and a network apparatus 302. The terminal apparatus 301 may be an example of or may be comprised in the terminal device 220 in FIG. 2. The network apparatus 302 may be an example of or may be comprised in the network device 210 in FIG. 1.

[0070] In the process 300, the network apparatus 302 transmits 310 to the terminal apparatus 301 an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi-persistently or aperiodically. The configuration of RSs given in the RS set is also provided where the configuration may include one or more information elements associated with each RS including time, frequency resource allocation, transmit power information. The terminal apparatus 301 receives 312 the event-triggered measurement reporting configuration.

[0071] As used in this specification, an active RS may refer to an RS that is actively being transmitted from the network or the UE has received an indication that the RS can be considered to be active. For example, periodic RSs (or RSs associated with an RS set or RS configuration where the resource type is set to periodic) may be considered active after the reception of the RRC configuration. A semi -persistent RS (or RS associated with an RS set or RS configuration with the resource type set to semi -persistent) may be considered active after the reception of an activation control message / command (e.g., MAC CE) for the SP RS and remains active until the reception of a deactivation command. Similarly, an aperiodic RS (or RS associated with an RS set or RS configuration with the resource type set to aperiodic) may be considered active after the reception of an activation control message / command (e.g., DCI) for the aperiodic RS and remains active until the transmission of the RS ends.

[0072] As used in this specification, the RS configured to be activated semi-persistently (SP) or aperiodically (AP) may be also referred to as SP / AP RS, dynamically activated RS, or RS to be activated dynamically. In some embodiments, examples of the SP / AP RS may comprise a SP CSI-RS or an AP CSI-RS. Any other suitable RS (e.g., synchronization signal (SS) / physical broadcast channel (PBCH) block) configured to be activated semi-persistently or aperiodically may also be used in the solutions according to the present disclosure. The scope of the present disclosure is not limited in this regard.

[0073] The SP / AP RS differs from a periodic RS in terms of the time-variant type. The periodic RS may be configured and activated by RRC signaling. After the RRC configuration is received, the terminal apparatus 301 may consider that the periodic RS is activated. In contrast, currently the SP / AP RS may be activated by a further downlink message other than the RRC signaling containing the configuration details of the SP / AP RS. For example, in 3GPP TS 38.331 and 38.312, it is specified that the semi persistent CSI-RS may be configured by RRC but activated / deactivated by a MAC CE, and the aperiodic CSI-RS may be configured by the RRC but activated by a DCI.

[0074] In some embodiments, the event-triggered measurement reporting configuration may be associated with an LTM procedure. For example, the event -triggered measurement reporting configuration may be an LTM reporting configuration, comprised in the LTM configuration via RRC signaling as illustrated in FIG. 1. In the LTM scenario, the RS set may be associated with one or more candidate target cells for cell switch purpose. The RS configured to be activated semi-persistently or aperiodically may be associated with a candidate cell configured for LTM for the first apparatus 301. For example, the SP RS or AP RS may be used for measuring the candidate cell. If a certain event is fulfilled, a cell switch from the serving cell to the candidate cell may occur. Examples of the event may comprise a beam of the candidate cell becoming amount of offset better than a beam of the serving cell.

[0075] In some embodiments, the event-triggered measurement reporting configuration may be associated with a BM (e.g., intra-cell mobility or intra-cell beam management or inter-cell beam management) procedure. For example, the event -triggered measurement reporting configuration may be a BM reporting configuration. The measurement RS set may be associated with the current serving cell(s). The RS configured to be activated semi-persistently or aperiodically may be associated with a beam different from a currently used beam (e.g., indicated TCI state) for the first apparatus 301. For example, the SP / AP RS may be associated with a new beam to be activated for measurement reporting due to the UE mobility. In some other examples, the SP / AP RS may be associated with a more refined beam determined based on measurements on other RSs.

[0076] With the event-triggered measurement reporting configuration, the network apparatus 302 configures one or more RSs including the SP / AP RS for the terminal apparatus 301. The network apparatus 302 may further transmit 314 a downlink controlmessage to the terminal apparatus 301 to indicate an activation of the SP / AP RS configured in the event-triggered measurement reporting configuration. The downlink control message may be for example, a LI command (e.g., a DCI) or a L2 command (e.g., a MAC CE).

[0077] In accordance with a determination that the downlink control message indicating the activation of the RS is received 316 at the terminal apparatus 301, the terminal apparatus 301 determines 318 to start performing an event -triggered measurement reporting procedure using the RS. As used in this specification, the event-triggered measurement reporting procedure may comprise one or more of measurements, event evaluation as per the configured event in the reporting configuration, and reporting when the event is met. For example, for LTM, an event may be defined as LTM2 event where beam of serving cell becomes worse than absolute threshold, or LTM3 event where beam of candidate cell becomes amount of offset better than beam of serving cell, or LTM4 event where beam of candidate cell becomes better than absolute threshold, or LTM5 event where beam of serving cell becomes worse than absolute thresholdl AND Beam of candidate cell becomes better than another absolute threshold2. Similarly, for BM, an event may be defined as quality of at least one new beam, such as Ll-RSRP, becomes a threshold value better than the current beam. Event or events to be used for an event- triggered measurement reporting may be indicated as a part of the reporting configuration.

[0078] In other words, after receiving 316 the downlink control message indicating the activation of the RS, the terminal apparatus 301 determines 318 to use the configured SP / AP RS to perform the event-triggered measurement reporting procedure, without waiting for a further message / indication for activating the event-triggered measurement reporting procedure (e.g., a message containing the information indicating the activation of the event-triggered measurement reporting).

[0079] This process may be referred to as event-triggered measurement reporting linked with RS activation / deactivation for discussion. Compared to a mechanism where the activation of RS and the activation of the event-triggered measurement reporting procedure are separate, i.e., not linked, this link mechanism can reduce the signaling overhead.

[0080] Similarly, the network apparatus 302 may further transmit 320 a downlink control message to the terminal apparatus 301 to indicate a deactivation of the SP / AP RSconfigured in the event-triggered measurement reporting configuration. For example, the network apparatus 302 may transmit the deactivation of the RS after the RS is activated earlier.

[0081] At terminal side, in accordance with a determination that the downlink control message indicating a deactivation of the RS is received 322 at the terminal apparatus 301, the terminal apparatus 301 determines 324 to stop performing the event-triggered measurement reporting procedure using the RS. That is, the deactivation of the RS may be linked with the deactivation of the event-triggered measurement reporting procedure.

[0082] It is to be noted that, one or both of the link for activation and the link for deactivation may be configured. For example, the activation of the RS may be linked with the activation of the event-triggered measurement reporting procedure, but the deactivation of the RS may be separate from the deactivation of the event-triggered measurement reporting procedure, or vice versa.

[0083] In some embodiments, the event-triggered measurement reporting configuration may comprise an indication of whether an activation or a deactivation of the event- triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS. For example, the event-triggered measurement reporting configuration may comprise an indication that an activation of the event-triggered measurement reporting procedure using the RS is based on the activation of the RS. Thus, when receiving the activation of the RS, the terminal apparatus 301 may determine to start performing the event -triggered measurement reporting procedure using the RS. In some other examples, the event-triggered measurement reporting configuration may comprise an indication that a deactivation of the event-triggered measurement reporting procedure using the RS is based on the deactivation of the RS.

[0084] Alternatively or in addition, the downlink control message indicating the activation (or deactivation) of the RS may further indicate (e.g., via an explicit indication) starting (or stopping) performing the event-triggered measurement reporting procedure using the RS. That is, the indication of whether the activation or the deactivation of the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS may be included in the downlink control message indicating the activation (or deactivation) of the RS. In one example, the DL control message / command activating one or more RS(s) may contain an indication to indicatewhether the UE can start measurements and event evaluation upon the reception of the DL control message / command. In this way, the link between the event-triggered measurement reporting the RS activation / deactivation may be configured by the network.

[0085] In some embodiments, this link mechanism may be left to UE implementation or may be standardized. For example, even without an explicit indication of the link between the event-triggered measurement reporting and the RS activation / deactivation, the terminal apparatus 301 may assume that the event -triggered measurement reporting is based on the RS activation / deactivation.

[0086] As an example, the terminal apparatus 301 may determine to start performing the event-triggered measurement reporting procedure using the SP / AP RS without receiving a further message for an activation of the event-triggered measurement reporting procedure from the second apparatus 302. The terminal apparatus 301 may determine to stop performing the event-triggered measurement reporting procedure using the SP / AP RS without receiving a further message for a deactivation of the event-triggered measurement reporting procedure from the second apparatus 302.

[0087] In some embodiments, the link between the event-triggered measurement reporting and the RS activation / deactivation may be specific to one RS. That is, activation of an RS may be linked to the activation of the event-triggered measurement reporting using the specific RS, without affecting the activation of the event -triggered measurement reporting using another RS.

[0088] For example, the RS set associated with the event -triggered measurement reporting configuration may comprise a first SP / AP RS and a second SP / AP RS. The activation (or deactivation) of the first SP / AP RS may not affect the event-triggered measurement reporting procedure using the second RS.

[0089] In some embodiments, if a downlink control message indicating an activation of the second RS is received, the terminal apparatus 301 may determine to start performing an event-triggered measurement reporting procedure using the second RS and continue performing the event -triggered measurement reporting procedure using the second RS as long as the second RS is active, regardless of whether the activation of or the deactivation of the first RS is received. The downlink control message indicating the activation of the second RS may be the same or different downlink control message indicating the activation of the first RS.

[0090] In some embodiments, the RS set associated with the event-triggered measurement reporting configuration may further comprise a periodic RS. The terminal apparatus 301 may start performing an event -triggered measurement reporting procedure using the periodic RS based on receiving the event-triggered measurement reporting configuration. The terminal apparatus 301 may continue performing the event -triggered measurement reporting procedure using the periodic RS regardless of whether the downlink control message indicating the activation or the deactivation of the SP / AP RS is received.

[0091] In some embodiments, the link between the event-triggered measurement reporting and the RS activation / deactivation may be specific to one or more RSs. That is, an activation of one RS may be linked to the activation of the event-triggered measurement reporting using one or more RSs in the RS set. In this case, an activation status of the RS set may be determined based on the activation / deactivation of the SP / AP RS and used for determining the activation / deactivation of the event-triggered measurement reporting procedure. Details of this mechanism will be described below with reference to FIG. 4.

[0092] FIG. 4 illustrates a signaling flow for an example process 400 of event-triggered measurement reporting based on an activation status of a RS set according to some example embodiments of the present disclosure. For the purpose of discussion, the process 400 involves the terminal apparatus 301 and the network apparatus 302 illustrated in FIG. 3. It will be appreciated that one or more steps of the process 300 may be combined with the process 400 or may replace any suitable step of the process 400.

[0093] In the process 400, the network apparatus 302 transmits 410, to the first apparatus 301, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi-persistently or aperiodically. The terminal apparatus 310 receives the event -triggered measurement reporting configuration.

[0094] Although not illustrated in FIG. 4, the terminal apparatus 301 may receive, from the network apparatus 302, a downlink control message indicating an activation of the SP / AP RS and / or a downlink control message indicating a deactivation of the SP / AP RS, as shown in FIG. 3.

[0095] With the event-triggered measurement reporting configuration, the RS setcontaining the SP / AP RS is configured for the terminal apparatus 301. Based on the SP / AP RS, the terminal apparatus 301 determines 414 an activation status of the RS set and determines 416 whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

[0096] In some embodiments, the activation status of the RS set may be fully inactive if one or more RSs in the RS set are inactive. For example, if the SP / AP RS is inactive, the terminal apparatus 301 may determine that the activation status of the RS set or the event- triggered reporting associated with the RS set is fully inactive.

[0097] In some embodiments, the activation status of the RS set may be fully active if one or more RSs in the RS set are active. For example, if the SP / AP RS is active, the terminal apparatus 301 may determine that the activation status of the RS set or the event- triggered reporting associated with the RS set is fully active. In such case, the UE may be configured to start performing the event evaluation for an event -triggered LI measurement reporting if at least one of the RS(s) associated with report configuration is active (already activated).

[0098] In some embodiments, the activation status of the RS set may be fully inactive if all RSs in the RS set are inactive. For example, if each RS of the RS set is inactive, the terminal apparatus 301 may determine that the activation status of the RS set is fully inactive.

[0099] In some embodiments, the activation status of the RS set may be fully active if all RSs in the RS set are active. For example, if each RS of the RS set is active, the terminal apparatus 301 may determine that the activation status of the RS set is fully active.

[0100] In some embodiments, the activation status of the RS set may be partially active if at least one RS in the RS set is active and at least one RS in the RS set is inactive. For example, the RS set may contain the SP / AP RS and a periodic RS. The terminal apparatus 301 may determine that the activation status of the RS set is partially active if the SP / AP RS is inactive. As another example, if a first SP / AP RS is active and a second SP / AP RS is inactive in the RS set, the terminal apparatus 301 may determine that the activation status of the RS set is partially active.

[0101] In some embodiments, if the activation status of the RS set is fully inactive, the terminal apparatus 301 may determine to refrain from performing the event -triggered measurement reporting procedure using any RS in the RS set. For example, the terminal apparatus 301 may determine to refrain from performing the event -triggered measurement reporting procedure using the periodic RS in the RS set.

[0102] In some embodiments, if the activation status of the RS set is fully active, the terminal apparatus 301 may determine to perform the event -triggered measurement reporting procedure using each RS of the RS set. For example, the UE may be configured to start performing the event evaluation for an event -triggered LI measurement reporting (or in other words, the event triggered reporting configuration is determined to be active) if all the RS(s) configured for (or associated with) the report configuration are active (already activated).

[0103] In some embodiments, the UE may be configured to refrain from / stop performing measurements and the event evaluation for an event -triggered LI measurement reporting if the at least one of the RSs associated with report configuration is not active (or is deactivated). The UE may be configured to start / continue performing the event evaluation for an event triggered LI measurement reporting only for a subset of RSs associated with the report configuration which are active (already activated), i.e., the UE may not perform measurements (and event evaluation) for associated RSs which are inactive or deactivated.

[0104] In some embodiments, if the activation status of the RS set is partially active, the terminal apparatus 301 may determine to perform the event -triggered measurement reporting procedure using the periodic RS in the RS set and refrain from performing an event-triggered measurement reporting procedure using one or more inactive SP / AP RSs in the RS set.

[0105] As an example, if the activation status of the RS set is partially active, the terminal apparatus 301 may determine to refrain from performing an event -triggered measurement reporting procedure using an inactive SP / AP RSs in the RS set, but perform an event-triggered measurement reporting procedure using an active SP / AP RS in the RS set.

[0106] In this case, the activation of at least one RS associated with the event-triggered LI measurement reporting may cause the UE to start performing the measurements and event evaluation using the activated RS or all active RSs. For example, upon the receptionof a DL control message / command (e.g., MAC-CE) activating one or more SP CSI-RSs, the UE may start performing the event evaluation according to the event triggered LI measurement reporting configuration for which the SP CSI-RS(s) is / are configured as measurement / candidate RS(s). As another example, the activation of an RS associated with an event -triggered LI measurement reporting may cause the UE to start performing the measurements and event evaluation using all the activated RSs associated with the event-triggered LI measurement reporting.

[0107] As another example, if the activation status of the RS set is partially active, the terminal apparatus 301 may determine to refrain from performing an event -triggered measurement reporting procedure using each of SP / AP RSs in the RS set, but perform the event-triggered measurement reporting procedure using the periodic RS in the RS set.

[0108] In this way, a mechanism of event-triggered measurement reporting based on a SP / AP RS is defined. Embodiments of the present disclosure provide different options for the UE to determine which RS (including periodic RS and SP / AP RS) is to be used for the event -triggered measurement reporting.

[0109] Additionally, as illustrated in FIG. 4, the terminal apparatus 301 may transmit 406, to the network apparatus 302, a capability indication of a capability to perform event- triggered measurement reporting using one or more SP / AP RSs. The network apparatus 302 may receive 408 the capability indication. For example, the UE may indicate a capability to perform event-triggered LI measurement reporting using dynamically activated RSs (e.g., SP CSI-RSs). Based on the capability indication, the network apparatus 302 may configure one or more SP / AP RSs for the terminal apparatus 301 for the event-triggered measurement reporting.

[0110] In some embodiments, the capability indication may comprise a maximum number or a minimum number of the one or more SP / AP RSs to be used for the event- triggered measurement reporting. In some examples, the capability indication may contain the maximum / minimum number of such RSs for which the UE may perform measurements for event-triggered LI measurement within a certain time period (e.g., slot).[OHl] In some embodiments, the maximum number or the minimum number may be associated with a semi-persistent type of RS or an aperiodic type of RS. That is, the maximum number or the minimum number may be defined per RS type. For example, the RS set may contain different types of RSs (e.g., periodic and SP), the maximum / minimumnumber of RSs for which the UE may perform measurements for event -triggered LI measurement within a certain time period (e.g., a slot, a subframe, a frame, a transmission time interval) may include different types of RSs.

[0112] Additionally, although not illustrated in FIG. 4, the link mechanism as discussed with reference to FIG. 3 may still hold true. In some embodiments, the downlink control message indicating an activation (or a deactivation) of an SP / AP RS may further indicate an activation or a deactivation of performing the event-triggered measurement reporting procedure using the SP / AP RS. In some embodiments, the downlink control message / command activating (or deactivating) one or more RS(s) may contain an indication to indicate whether the UE to stop measurements and event evaluation for all the RSs (including the RSs not being indicated in the deactivation command) associated with the event -triggered LI measurement reporting.

[0113] Alternatively or additionally, the event-triggered measurement reporting configuration may comprise an indication that an activation (or a deactivation) of the event-triggered measurement reporting procedure using the RS is based on the activation (or the deactivation) of the SP / AP RS.

[0114] As discussed above, an activation (or a deactivation) of one SP / AP RS may cause the activation status of the RS set to be fully active (or fully inactive). In such case, the activation (or deactivation) of one SP / AP RS may be linked to the activation (or deactivation) of the event-triggered measurement reporting using one or more RSs in the RS set. For example, one or more SP / AP RSs may be activated / deactivated altogether. In some other examples, all RSs, including periodic RSs may be activated / deactivated altogether.

[0115] In some embodiments, the terminal apparatus 301 may further receive from the second apparatus 302, a further message for an activation or a deactivation of performing the event-triggered measurement reporting procedure (not illustrated in FIG. 4) or an activation or a deactivation of the event -triggered measurement reporting. In other words, in addition to the downlink control message indicating the activation (or deactivation) of the SP / AP RS, a further downlink control message may be used to activate (deactivate) the event-triggered measurement reporting procedure. In some examples, another DL control message / command (after the activation of RSs) may be used to activate the measurements and event evaluation based on the associated activated RSs. In someexamples, the further message may indicate activating (deactivating) the event-triggered measurement reporting procedure using a specific RS.

[0116] In some embodiments, the event-triggered measurement reporting configuration may comprise an indication of whether an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS. Based on this indication, the terminal apparatus 301 may understand whether to wait for the further message for an activation or a deactivation of performing the event-triggered measurement reporting procedure.

[0117] With the processes 300 and 400, several solutions are provided to enable event- triggered LI measurement reporting using dynamically activated RSs (e.g., SP CSI-RS), where UE is configured / enabled to start performing the measurements and event evaluation based on the activation status of the RSs configured for (or associated with) the report configuration.

[0118] In some embodiments, the activation of one of more RSs associated with an event-triggered LI measurement reporting may cause the UE to start performing the measurements and event evaluation using one or more RSs associated with the event triggered LI measurement reporting. In some embodiments, the deactivation of one of more RSs associated with an event -triggered LI measurement reporting may cause the UE to stop performing the measurements and event evaluation using the one or more RSs associated with the event -triggered LI measurement reporting.

[0119] In some embodiments, the UE may be configured to start performing the event evaluation for an event -triggered LI measurement reporting configuration (or in other words, the event triggered reporting configuration is determined to be active) based on a resource type (i.e., time domain behavior of RS, or RS Set or RS configuration associated with the RS) of RS(s) configured / associated with the reporting. That is, the UE may determine whether to start / stop performing the event -triggered LI measurement reporting based on periodicity of the RS, e.g., periodic RS (CSI-RS), semi -persistent RS (CSI-RS), or aperiodic RS (CSI-RS).

[0120] In some embodiments, the activation of an RS associated (e.g. activation of at least one RS, or RS set) with an event -triggered LI measurement reporting may cause the UE to start performing the measurements and event evaluation using one or more active RS (e.g., the specifically activated RS and optionally other active RSs). For example,upon the reception of an DL control message / command (e.g., MAC-CE) activating one or more SP CSI-RSs, the UE may start performing the event evaluation according to the event triggered LI measurement reporting configuration for which the SP CSI-RS(s) is / are configured as measurement / candidate RS(s). Alternatively, the UE may start performing the measurements and event evaluation using all the activated RSs associated with an event-triggered LI measurement reporting.

[0121] In some embodiments, the deactivation of an RS associated with an event triggered LI measurement reporting may cause the UE to stop performing the measurements and event evaluation using one or more inactive RS (e.g., the specifically deactivated RS and optionally other inactive RSs). For example, upon the reception of a control message / command (e.g., MAC-CE) deactivating one or more SP CSI-RSs, the UE may stop performing the event evaluation according to the event -triggered LI measurement reporting configuration for which the SP CSI-RS(s) is / are configured as measurement / candidate RS(s). Alternatively, the UE may stop performing the measurements and event evaluation for all the RSs associated with an event triggered LI measurement reporting.

[0122] FIG. 5 illustrates a signaling flow for an example process 500 of event-triggered measurement reporting according to some example embodiments of the present disclosure. As illustrated in FIG. 5, the process 500 involves a UE 501, a serving cell 502 and a candidate cell 503.

[0123] At step 1, the UE 501 may transmit a UE capability indication to the serving cell 502. The capability indication indicates the support of event -triggered LI reporting using candidate SP CSI-RSs.

[0124] At step 2, the serving cell 502 may transmit a reporting configuration 1 to the UE 501. The reporting configuration 1 is linked with a candidate measurement RS set 1 including P CSI-RS 1, P CSLRS 2, SP CSI-RS 1, SP CSLRS 2, and SP CSI-RS N.

[0125] At step 3, the UE 501 may start the measurement and event evaluation for the reporting configuration 1 using only P CSI-RS 1 and P CSI-RS 2 because the SP CSI-RSs are not activated yet.

[0126] At step 4, the serving cell 502 may transmit an activation of the SP CSI-RS 1 and the SP CSI-RS 2. Upon receiving the activation, at step 5, the UE 501 may start themeasurements and event evaluation using the activated SP CSI-RS 1 and SP CSI-RS 2. In the meantime, the UE 501 may continue the measurements and event evaluation using the P CSI-RS 1 and P CSI-RS 2.

[0127] At step 6, the serving cell 502 may transmit a deactivation of the SP CSI-RS 1. Upon receiving the deactivation, at step 7, the UE 501 may continue the measurements and event evaluation using the P CSI-RS 1, P CSI-RS 2 and SP CSI-RS 2.

[0128] At step 8, the UE 501 may determine that at least one reporting event has been triggered. At step 9, the serving cell 502 may transmit, to the UE 501, UL resource allocation, e.g., dynamic or configured UL grant or any available UL grant. At step 10, the UE 501 may transmit the measurement report using the MAC protocol data unit (PDU) on a UL shared channel. In some cases, when the reporting event is met, the UE may indicate the event using uplink control information (on allocated physical uplink control channel), after which the UE may receive an UL grant (e.g., in a DCI) to send the measurement report. In some cases, when the reporting event is met, the UE may indicate the event using uplink control information (on first allocated physical uplink control channel), and send the measurement report in the following second uplink channel associated with the first uplink channel. Other mechanisms may be used to send the measurement report when an event is met.

[0129] FIG. 6 illustrates a signaling flow for another example process 600 of event- triggered measurement reporting according to some example embodiments of the present disclosure. For the purpose of simplicity, details of steps similar to the steps in the process 500 will be omitted.

[0130] As illustrated in FIG. 6, at step 2, the serving cell 502 may transmit a reporting configuration 1 to the UE 501. The reporting configuration 1 is linked with a candidate measurement RS set 1 including P CSI-RS 1, P CSI-RS 2, SP CSI-RS 1, SP CSI-RS 2.

[0131] At step 3, since not all RSs are active, the UE 501 may not start the measurements and event evaluation for the reporting configuration 1. That is, the UE 501 may consider that the activation status of the RS set is fully inactive.

[0132] At step 4, the serving cell 502 may transmit an activation of the SP CSI-RS 1 and the SP CSI-RS 2. Upon receiving the activation, at step 5, since all the RSs are active, the UE 501 may start the measurements and event evaluation for the reporting configuration1. That is, the UE 501 may consider that the activation status of the RS set is fully active.

[0133] At step 6, the serving cell 502 may transmit a deactivation of the SP CSI-RS 1. Upon receiving the deactivation, at step 7-1, the UE 501 may continue the measurements and event evaluation using the P CSI-RS 1, P CSI-RS 2 and SP CSI-RS 2. Alternatively, at step 7-2, the UE 501 may stop the measurements and event evaluation for the reporting configuration 1. That is, based on the deactivation of SP CSI-RS 1, the UE 501 may consider that the activation status of the RS set is fully inactive.

[0134] FIG. 7 shows a flowchart of an example method 700 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 700 will be described from the perspective of the terminal device 220 in FIG. 2.

[0135] At block 710, the terminal device 220 receives, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi- persistently or aperiodically.

[0136] At block 720, in accordance with a determination that a downlink control message indicating an activation of the RS is received, the terminal device 220 determines to start performing an event -triggered measurement reporting procedure using the RS.

[0137] At block 730, in accordance with a determination that a downlink control message indicating a deactivation of the RS is received, the terminal device 220 determines to stop performing the event-triggered measurement reporting procedure using the RS.

[0138] In some example embodiments, the method 700 further comprises: starting performing an event-triggered measurement reporting procedure using the periodic RS based on receiving the event-triggered measurement reporting configuration; and continuing performing the event-triggered measurement reporting procedure using the periodic RS after receiving the downlink control message indicating the activation or the deactivation of the RS configured to be activated semi-persistently or aperiodically.

[0139] In some example embodiments, the method 700 further comprises: in accordance with a determination that a downlink control message indicating an activation of the second RS is received, determining to start performing an event-triggered measurementreporting procedure using the second RS; and in accordance with a determination that the second RS is active, continuing performing the event-triggered measurement reporting procedure using the second RS after receiving the activation of or the deactivation of the first RS.

[0140] In some example embodiments, the method 700 further comprises: in accordance with a determination that a downlink control message indicating a deactivation of the second RS is received, determining to stop performing the event-triggered measurement reporting procedure using the second RS.

[0141] In some example embodiments, in accordance with the determination that the downlink control message indicating the activation of the RS is received, determining to start performing the event-triggered measurement reporting procedure using the RS comprises: determining to start performing the event-triggered measurement reporting procedure using the RS without receiving a further message for an activation of the event- triggered measurement reporting procedure from the second apparatus.

[0142] In some example embodiments, in accordance with the determination that the downlink control message indicating the deactivation of the RS is received, determining to stop performing the event-triggered measurement reporting procedure using the RS comprises: determining to stop performing the event-triggered measurement reporting procedure using the RS without receiving a further message for a deactivation of the event-triggered measurement reporting procedure from the second apparatus.

[0143] In some example embodiments, wherein: the downlink control message indicating the activation of the RS further indicates starting performing the event- triggered measurement reporting procedure using the RS, and / or the downlink control message indicating the deactivation of the RS further indicates stopping performing the event-triggered measurement reporting procedure using the RS.

[0144] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

[0145] In some example embodiments, the method 700 further comprises: transmitting, to the second apparatus, a capability indication of a capability to perform event-triggeredmeasurement reporting using one or more RSs configured to be activated semi- persistently or aperiodically.

[0146] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0147] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0148] In some example embodiments, the event-triggered measurement reporting configuration is

[0149] FIG. 8 shows a flowchart of an example method 800 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the network device 210 in FIG. 2.

[0150] At block 810, the terminal device 220 transmits, to a first apparatus, an event- triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically. and

[0151] At block 820, the terminal device 220 transmits a downlink control message indicating an activation of the RS to the first apparatus without transmitting a further message for an activation of an event-triggered measurement reporting procedure, or transmits a downlink control message indicating a deactivation of the RS to the first apparatus without transmitting a further message for a deactivation of an event-triggered measurement reporting procedure.

[0152] In some example embodiments, wherein: the downlink control message indicating the activation of the RS further indicates starting performing the event- triggered measurement reporting procedure using the RS, or the downlink control message indicating the deactivation of the RS further indicates stopping performing the event-triggered measurement reporting procedure using the RS.

[0153] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of the event-triggered measurement reporting procedure using the RS is based on the activationor the deactivation of the RS.

[0154] In some example embodiments, the method 800 further comprises: receiving, from the first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more RSs configured to be activated semi- persistently or aperiodically.

[0155] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0156] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0157] In some example embodiments, the event-triggered measurement reporting configuration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi -persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

[0158] In some example embodiments, the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

[0159] In some example embodiments, a first apparatus capable of performing any of the method 700 (for example, the terminal device 220 in FIG. 2) may comprise means for performing the respective operations of the method 700. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The first apparatus may be implemented as or included in the terminal device 220 in FIG. 2.

[0160] In some example embodiments, the first apparatus comprises means for receiving, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; means for in accordance with a determination that a downlink control message indicating an activation of the RS is received, determining to start performing an event-triggered measurement reporting procedure using the RS; and means for in accordance with a determination that a downlinkcontrol message indicating a deactivation of the RS is received, determining to stop performing the event -triggered measurement reporting procedure using the RS.

[0161] In some example embodiments, the first apparatus further comprises: means for starting performing an event-triggered measurement reporting procedure using the periodic RS based on receiving the event-triggered measurement reporting configuration; and means for continuing performing the event-triggered measurement reporting procedure using the periodic RS after receiving the downlink control message indicating the activation or the deactivation of the RS configured to be activated semi -persistently or aperiodically.

[0162] In some example embodiments, the first apparatus further comprises: means for in accordance with a determination that a downlink control message indicating an activation of the second RS is received, determining to start performing an event- triggered measurement reporting procedure using the second RS; and means for in accordance with a determination that the second RS is active, continuing performing the event-triggered measurement reporting procedure using the second RS after receiving the activation of or the deactivation of the first RS.

[0163] In some example embodiments, the first apparatus further comprises: means for in accordance with a determination that a downlink control message indicating a deactivation of the second RS is received, determining to stop performing the event- triggered measurement reporting procedure using the second RS.

[0164] In some example embodiments, the means for in accordance with the determination that the downlink control message indicating the activation of the RS is received, determining to start performing the event-triggered measurement reporting procedure using the RS comprises: means for determining to start performing the event- triggered measurement reporting procedure using the RS without receiving a further message for an activation of the event-triggered measurement reporting procedure from the second apparatus.

[0165] In some example embodiments, the means for in accordance with the determination that the downlink control message indicating the deactivation of the RS is received, determining to stop performing the event-triggered measurement reporting procedure using the RS comprises: means for determining to stop performing the event- triggered measurement reporting procedure using the RS without receiving a furthermessage for a deactivation of the event-triggered measurement reporting procedure from the second apparatus.

[0166] In some example embodiments, wherein: the downlink control message indicating the activation of the RS further indicates starting performing the event- triggered measurement reporting procedure using the RS, and / or the downlink control message indicating the deactivation of the RS further indicates stopping performing the event-triggered measurement reporting procedure using the RS.

[0167] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

[0168] In some example embodiments, the first apparatus further comprises: means for transmitting, to the second apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more RSs configured to be activated semi -persistently or aperiodically.

[0169] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0170] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0171] In some example embodiments, the event-triggered measurement reporting configuration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi -persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

[0172] In some example embodiments, the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

[0173] In some example embodiments, a second apparatus capable of performing any of the method 800 (for example, the network device 210 in FIG. 2) may comprise means for performing the respective operations of the method 800. The means may be implementedin any suitable form. For example, the means may be implemented in a circuitry or software module. The second apparatus may be implemented as or included in the network device 210 in FIG. 2.

[0174] In some example embodiments, the second apparatus comprises means for transmitting, to a first apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; and means for transmitting a downlink control message indicating an activation of the RS to the first apparatus without transmitting a further message for an activation of an event-triggered measurement reporting procedure, or means for transmitting a downlink control message indicating a deactivation of the RS to the first apparatus without transmitting a further message for a deactivation of an event-triggered measurement reporting procedure.

[0175] In some example embodiments, wherein: the downlink control message indicating the activation of the RS further indicates starting performing the event- triggered measurement reporting procedure using the RS, or the downlink control message indicating the deactivation of the RS further indicates stopping performing the event-triggered measurement reporting procedure using the RS.

[0176] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

[0177] In some example embodiments, the second apparatus further comprises: means for receiving, from the first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more RSs configured to be activated semi -persistently or aperiodically.

[0178] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0179] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0180] In some example embodiments, the event-triggered measurement reportingconfiguration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi -persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

[0181] In some example embodiments, the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

[0182] FIG. 9 shows a flowchart of an example method 900 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 900 will be described from the perspective of the terminal device 220 in FIG. 2.

[0183] At block 910, the terminal device 220 receives, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi- persistently or aperiodically.

[0184] At block 920, the terminal device 220 determines an activation status of the RS set based on the RS configured to be activated semi -persistently or aperiodically.

[0185] At block 930, the terminal device 220 determines whether to perform an event- triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

[0186] In some example embodiments, determining the activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically comprises at least one of in accordance with a determination that the RS is inactive, determining that the activation status of the RS set is fully inactive; and in accordance with a determination that the RS is active, determining that the activation status of the RS set is fully active.

[0187] In some example embodiments, determining the activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically comprises at least one of in accordance with a determination that each RS of the RS set is inactive, determining that the activation status of the RS set is fully inactive; and in accordance with a determination that each RS of the RS set is active, determining that the activationstatus of the RS set is fully active.

[0188] In some example embodiments, determining whether to perform the event- triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises: in accordance with a determination that the activation status of the RS set is fully inactive, determining to refrain from performing the event-triggered measurement reporting procedure using any RS of the RS set; and in accordance with a determination that the activation status of the RS set is fully active, determining to perform the event-triggered measurement reporting procedure using each RS of the RS set.

[0189] In some example embodiments, the RS set further contains a periodic RS, and determining the activation status of the RS set based on the RS configured to be activated semi -persistently or aperiodically comprises: in accordance with a determination that the RS is inactive, determining that the activation status of the RS set is partially active.

[0190] In some example embodiments, determining whether to perform the event- triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises: in accordance with a determination that the activation status of the RS set is partially active, determining to perform the event- triggered measurement reporting procedure using the periodic RS and refrain from performing an event-triggered measurement reporting procedure using the RS configured to be activated semi-persistently or aperiodically.

[0191] In some example embodiments, the first apparatus is further caused to start performing the event-triggered measurement reporting procedure using the periodic RS based on receiving the event-triggered measurement reporting configuration, and wherein determining to perform the event-triggered measurement reporting procedure using the periodic RS comprises: continuing performing the event-triggered measurement reporting procedure using the periodic RS.

[0192] In some example embodiments, the RS configured to be activated semi- persistently or aperiodically is a first RS, the RS set further contains a second RS configured to be activated semi-persistently or aperiodically, and determining the activation status of the RS set based on the first RS configured to be activated semi- persistently or aperiodically comprises: in accordance with a determination that the first RS is active and the second RS is inactive, determining that the activation status of theRS set is partially active.

[0193] In some example embodiments, determining whether to perform the event- triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises: in accordance with a determination that the activation status of the RS set is partially active, determining to perform the event- triggered measurement reporting procedure using the first RS and refrain from performing an event -triggered measurement reporting procedure using the second RS.

[0194] In some example embodiments, the method 900 further comprises: receiving, from the second apparatus, a downlink control message indicating an activation or a deactivation of the RS configured to be activated semi-persistently or aperiodically.

[0195] In some example embodiments, the method 900 further comprises: receiving, from the second apparatus, a further message for an activation or a deactivation of performing the event-triggered measurement reporting procedure.

[0196] In some example embodiments, the downlink control message further indicates an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS.

[0197] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

[0198] In some example embodiments, the method 900 further comprises: transmitting, to the second apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more RSs configured to be activated semi- persistently or aperiodically.

[0199] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0200] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0201] In some example embodiments, the event-triggered measurement reportingconfiguration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi -persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

[0202] In some example embodiments, the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

[0203] FIG. 10 shows a flowchart of an example method 1000 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 1000 will be described from the perspective of the network device 210 in FIG. 2.

[0204] At block 1010, the network device 210 receives, from a first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi -persistently or aperiodically.

[0205] At block 1020, the network device 210 transmits, to the first apparatus, an event- triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi-persistently or aperiodically.

[0206] In some example embodiments, the method 1000 further comprises: transmitting, to the first apparatus, a downlink control message indicating an activation or a deactivation of the RS configured to be activated semi-persistently or aperiodically.

[0207] In some example embodiments, the method 1000 further comprises: transmitting, to the first apparatus, a further message for an activation or a deactivation of performing the event-triggered measurement reporting procedure.

[0208] In some example embodiments, the downlink control message further indicates an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS.

[0209] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

[0210] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0211] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0212] In some example embodiments, the event-triggered measurement reporting configuration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi -persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

[0213] In some example embodiments, the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

[0214] In some example embodiments, a first apparatus capable of performing any of the method 900 (for example, the terminal device 220 in FIG. 2) may comprise means for performing the respective operations of the method 900. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The first apparatus may be implemented as or included in the terminal device 220 in FIG. 2.

[0215] In some example embodiments, the first apparatus comprises means for receiving, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi -persistently or aperiodically; means for determining an activation status of the RS set based on the RS configured to be activated semi- persistently or aperiodically; and means for determining whether to perform an event- triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

[0216] In some example embodiments, the means for determining the activation status of the RS set based on the RS configured to be activated semi -persistently or aperiodically comprises means for at least one of in accordance with a determination that the RS is inactive, determining that the activation status of the RS set is fully inactive; and inaccordance with a determination that the RS is active, determining that the activation status of the RS set is fully active.

[0217] In some example embodiments, the means for determining the activation status of the RS set based on the RS configured to be activated semi -persistently or aperiodically comprises means for at least one of: in accordance with a determination that each RS of the RS set is inactive, determining that the activation status of the RS set is fully inactive; and in accordance with a determination that each RS of the RS set is active, determining that the activation status of the RS set is fully active.

[0218] In some example embodiments, the means for determining whether to perform the event-triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises means for: in accordance with a determination that the activation status of the RS set is fully inactive, determining to refrain from performing the event-triggered measurement reporting procedure using any RS of the RS set; and in accordance with a determination that the activation status of the RS set is fully active, determining to perform the event-triggered measurement reporting procedure using each RS of the RS set.

[0219] In some example embodiments, the RS set further contains a periodic RS, and the means for determining the activation status of the RS set based on the RS configured to be activated semi -persistently or aperiodically comprises means for: in accordance with a determination that the RS is inactive, determining that the activation status of the RS set is partially active.

[0220] In some example embodiments, the means for determining whether to perform the event-triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises means for: in accordance with a determination that the activation status of the RS set is partially active, determining to perform the event-triggered measurement reporting procedure using the periodic RS and refrain from performing an event-triggered measurement reporting procedure using the RS configured to be activated semi-persistently or aperiodically.

[0221] In some example embodiments, the first apparatus may further comprise means for starting performing the event-triggered measurement reporting procedure using the periodic RS based on receiving the event-triggered measurement reporting configuration, and wherein determining to perform the event -triggered measurement reporting procedureusing the periodic RS comprises: continuing performing the event-triggered measurement reporting procedure using the periodic RS.

[0222] In some example embodiments, the RS configured to be activated semi- persistently or aperiodically is a first RS, the RS set further contains a second RS configured to be activated semi -persistently or aperiodically, and the means for determining the activation status of the RS set based on the first RS configured to be activated semi -persistently or aperiodically comprises means for: in accordance with a determination that the first RS is active and the second RS is inactive, determining that the activation status of the RS set is partially active.

[0223] In some example embodiments, the means for determining whether to perform the event-triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises means for: in accordance with a determination that the activation status of the RS set is partially active, determining to perform the event-triggered measurement reporting procedure using the first RS and refrain from performing an event-triggered measurement reporting procedure using the second RS.

[0224] In some example embodiments, the first apparatus further comprises: means for receiving, from the second apparatus, a downlink control message indicating an activation or a deactivation of the RS configured to be activated semi -persistently or aperiodically.

[0225] In some example embodiments, the first apparatus further comprises: means for receiving, from the second apparatus, a further message for an activation or a deactivation of performing the event -triggered measurement reporting procedure.

[0226] In some example embodiments, the downlink control message further indicates an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS.

[0227] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

[0228] In some example embodiments, the first apparatus further comprises: means for transmitting, to the second apparatus, a capability indication of a capability to performevent-triggered measurement reporting using one or more RSs configured to be activated semi -persistently or aperiodically.

[0229] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0230] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0231] In some example embodiments, the event-triggered measurement reporting configuration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi -persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

[0232] In some example embodiments, the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

[0233] In some example embodiments, a second apparatus capable of performing any of the method 1000 (for example, the network device 210 in FIG. 2) may comprise means for performing the respective operations of the method 1000. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The second apparatus may be implemented as or included in the network device 210 in FIG. 2.

[0234] In some example embodiments, the second apparatus comprises means for receiving, from a first apparatus, a capability indication of a capability to perform event- triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi -persistently or aperiodically; and means for transmitting, to the first apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi-persistently or aperiodically.

[0235] In some example embodiments, the second apparatus further comprises: means for transmitting, to the first apparatus, a downlink control message indicating an activation or a deactivation of the RS configured to be activated semi-persistently oraperiodically.

[0236] In some example embodiments, the second apparatus further comprises: means for transmitting, to the first apparatus, a further message for an activation or a deactivation of performing the event-triggered measurement reporting procedure.

[0237] In some example embodiments, the downlink control message further indicates an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS.

[0238] In some example embodiments, the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

[0239] In some example embodiments, the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event-triggered measurement reporting.

[0240] In some example embodiments, the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

[0241] In some example embodiments, the event-triggered measurement reporting configuration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi -persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

[0242] In some example embodiments, the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

[0243] FIG. 11 is a simplified block diagram of a device 1100 that is suitable for implementing example embodiments of the present disclosure. The device 1100 may be provided to implement a communication device, for example, the terminal device 220 or the network device 210 as shown in FIG. 2. As shown, the device 1100 includes one or more processors 1110, one or more memories 1120 coupled to the processor 1110, and one or more communication modules 1140 coupled to the processor 1110.

[0244] The communication module 1140 is for bidirectional communications. The communication module 1140 has one or more communication interfaces to facilitate communication with one or more other modules or devices. The communication interfaces may represent any interface that is necessary for communication with other network elements. In some example embodiments, the communication module 1140 may include at least one antenna.

[0245] The processor 1110 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 1100 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.

[0246] The memory 1120 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 1124, an electrically programmable read only memory (EPROM), a flash memory, a hard disk, a compact disc (CD), a digital video disk (DVD), an optical disk, a laser disk, and other magnetic storage and / or optical storage. Examples of the volatile memories include, but are not limited to, a randomaccess memory (RAM) 1122 and other volatile memories that will not last in the powerdown duration.

[0247] A computer program 1130 includes computer executable instructions that are executed by the associated processor 1110. The instructions of the program 1130 may include instructions for performing operations / acts of some example embodiments of the present disclosure. The program 1130 may be stored in the memory, e.g., the ROM 1124. The processor 1110 may perform any suitable actions and processing by loading the program 1130 into the RAM 1122.

[0248] The example embodiments of the present disclosure may be implemented by means of the program 1130 so that the device 1100 may perform any process of the disclosure as discussed with reference to FIG. 2 to FIG. 10. The example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

[0249] In some example embodiments, the program 1130 may be tangibly contained ina computer readable medium which may be included in the device 1100 (such as in the memory 1120) or other storage devices that are accessible by the device 1100. The device 1100 may load the program 1130 from the computer readable medium to the RAM 1122 for execution. In some example embodiments, the computer readable medium may include any types of non -transitory storage medium, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. 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).

[0250] FIG. 12 shows an example of the computer readable medium 1200 which may be in form of CD, DVD or other optical storage disk. The computer readable medium 1200 has the program 1130 stored thereon.

[0251] Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, and other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. Although various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

[0252] Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods as described above. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may belocated in both local and remote storage media.

[0253] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. The program code may be provided to a processor or controller of a general-purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program code, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

[0254] In the context of the present disclosure, the computer program code or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.

[0255] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a randomaccess memory (RAM), a read-only memory (ROM), an erasable programmable readonly memory (EPROM or Flash memory), an optical fiber, a portable compact disc readonly memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0256] Further, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, although several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Unless explicitly stated, certain features that are described in the contextof separate embodiments may also be implemented in combination in a single embodiment. Conversely, unless explicitly stated, various features that are described in the context of a single embodiment may also be implemented in a plurality of embodiments separately or in any suitable sub-combination.

[0257] Although the present disclosure has been described in languages specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

WHAT IS CLAIMED IS1. A first apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus at least to: receive, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi-persistently or aperiodically; determine an activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically; and determine whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

2. The first apparatus of claim 1, wherein determining the activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically comprises at least one of: in accordance with a determination that the RS is inactive, determining that the activation status of the RS set is fully inactive; and in accordance with a determination that the RS is active, determining that the activation status of the RS set is fully active.

3. The first apparatus of claim 1, wherein determining the activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically comprises at least one of: in accordance with a determination that each RS of the RS set is inactive, determining that the activation status of the RS set is fully inactive; and in accordance with a determination that each RS of the RS set is active, determining that the activation status of the RS set is fully active.

4. The first apparatus of claim 2 or 3, wherein determining whether to perform theevent-triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises: in accordance with a determination that the activation status of the RS set is fully inactive, determining to refrain from performing the event-triggered measurement reporting procedure using any RS of the RS set; and in accordance with a determination that the activation status of the RS set is fully active, determining to perform the event-triggered measurement reporting procedure using each RS of the RS set.

5. The first apparatus of claim 1, wherein the RS set further contains a periodic RS, and determining the activation status of the RS set based on the RS configured to be activated semi -persistently or aperiodically comprises: in accordance with a determination that the RS is inactive, determining that the activation status of the RS set is partially active.

6. The first apparatus of claim 5, wherein determining whether to perform the event-triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises: in accordance with a determination that the activation status of the RS set is partially active, determining to perform the event-triggered measurement reporting procedure using the periodic RS and refrain from performing an event-triggered measurement reporting procedure using the RS configured to be activated semi- persistently or aperiodically.

7. The first apparatus of claim 6, wherein the first apparatus is further caused to start performing the event-triggered measurement reporting procedure using the periodic RS based on receiving the event-triggered measurement reporting configuration, and wherein determining to perform the event-triggered measurement reporting procedure using the periodic RS comprises: continuing performing the event -triggered measurement reporting procedure using the periodic RS.

8. The first apparatus of claim 1, wherein the RS configured to be activated semi- persistently or aperiodically is a first RS, the RS set further contains a second RS50configured to be activated semi-persistently or aperiodically, and determining the activation status of the RS set based on the first RS configured to be activated semi- persistently or aperiodically comprises: in accordance with a determination that the first RS is active and the second RS is inactive, determining that the activation status of the RS set is partially active.

9. The first apparatus of claim 8, wherein determining whether to perform the event-triggered measurement reporting procedure using the at least one RS in the RS set based on the activation status of RS set comprises: in accordance with a determination that the activation status of the RS set is partially active, determining to perform the event-triggered measurement reporting procedure using the first RS and refrain from performing an event -triggered measurement reporting procedure using the second RS.

10. The first apparatus of any of claims 1 to 9, wherein the first apparatus is further caused to: receive, from the second apparatus, a downlink control message indicating an activation or a deactivation of the RS configured to be activated semi-persistently or aperiodically.

11. The first apparatus of claim 10, wherein the first apparatus is further caused to: receive, from the second apparatus, a further message for an activation or a deactivation of performing the event-triggered measurement reporting procedure.

12. The first apparatus of claim 10, wherein the downlink control message further indicates an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS.

13. The first apparatus of any of claims 1 to 12, wherein the event-triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.5114. The first apparatus of any of claims 1 to 13, wherein the first apparatus is further caused to: transmit, to the second apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more RSs configured to be activated semi -persistently or aperiodically.

15. The first apparatus of claim 14, wherein the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event- triggered measurement reporting.

16. The first apparatus of claim 15, wherein the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

17. The first apparatus of any of claims 1 to 16, wherein the event-triggered measurement reporting configuration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi- persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

18. The first apparatus of any of claims 1 to 16, wherein the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

19. A second apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus at least to: receive, from a first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi -persistently or aperiodically; and transmit, to the first apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi-persistently or aperiodically.5220. The second apparatus of claim 19, wherein the second apparatus is further caused to: transmit, to the first apparatus, a downlink control message indicating an activation or a deactivation of the RS configured to be activated semi -persistently or aperiodically.

21. The second apparatus of claim 20, wherein the second apparatus is further caused to: transmit, to the first apparatus, a further message for an activation or a deactivation of performing the event-triggered measurement reporting procedure.

22. The second apparatus of claim 20, wherein the downlink control message further indicates an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS.

23. The second apparatus of any of claims 19 to 22, wherein the event -triggered measurement reporting configuration comprises an indication of whether an activation or a deactivation of performing the event-triggered measurement reporting procedure using the RS is based on the activation or the deactivation of the RS.

24. The second apparatus of any of claims 19 to 23, wherein the capability indication comprises a maximum number or a minimum number of the one or more RSs to be used for the event -triggered measurement reporting.

25. The second apparatus of claim 24, wherein the maximum number or the minimum number is associated with a semi-persistent type of RS or an aperiodic type of RS.

26. The second apparatus of any of claims 19 to 25, wherein the event-triggered measurement reporting configuration is associated with a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) procedure, and the RS configured to be activated semi- persistently or aperiodically is associated with a candidate cell configured for LTM for the first apparatus.

27. The second apparatus of any of claims 19 to 25, wherein the event-triggered measurement reporting configuration is associated with a beam management procedure and the RS configured to be activated semi -persistently or aperiodically is associated with a beam different from a currently used beam for the first apparatus.

28. A method comprising: receiving, at a first apparatus and from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi-persistently or aperiodically; determining an activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically; and determining whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

29. A method comprising: receiving, at a second apparatus and from a first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi-persistently or aperiodically; and transmitting, to the first apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi-persistently or aperiodically.

30. A first apparatus comprising: means for receiving, from a second apparatus, an event-triggered measurement reporting configuration associated with a measurement reference signal (RS) set containing at least an RS configured to be activated semi-persistently or aperiodically; means for determining an activation status of the RS set based on the RS configured to be activated semi-persistently or aperiodically; and means for determining whether to perform an event-triggered measurement reporting procedure using at least one RS in the RS set based on the activation status of the RS set.

31. A second apparatus comprising: means for receiving, from a first apparatus, a capability indication of a capability to perform event-triggered measurement reporting using one or more reference signals (RSs) configured to be activated semi -persistently or aperiodically; and means for transmitting, to the first apparatus, an event-triggered measurement reporting configuration associated with a measurement RS set containing at least an RS configured to be activated semi -persistently or aperiodically.

32. A computer readable medium comprising instructions stored thereon for causing an apparatus at least to perform the method of claim 28 or the method of claim 29.55

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