Devices and methods for event-based CSI reporting

Abstract

Example embodiments provide methods for supporting event-based channel state information reporting. A user node is configured to receive, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; receive, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; receive, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; detect that the event has triggered based on measurements performed by the user node; transmit an uplink signal using the at least one uplink resource to notify the network node of the triggered event. Devices, methods, and computer programs are disclosed.

Description

DEVICES AND METHODS FOR EVENT-BASED CSI REPORTINGTECHNICAL FIELD

[0001] The present application generally relates to information technology. Some example embodiments of the present application relate to supporting event-based channel state information, CSI, reporting along with non-event-based CSI reporting.BACKGROUND

[0002] User equipment (UE) can transmit CSI reports to the network to provide information about the current channel conditions. CSI reporting helps the network optimize various aspects of communication, such as resource allocation, beamforming, and transmission parameters, based on the current channel conditions. In the existing CSI framework in 5G NR, beam and CSI reporting may be fully controlled and scheduled by a network node, such as a gNB. However, the gNB may not be aware that the current beam and corresponding channel have changed such that beam switch would be needed. This may be due to changes in, for example, a position, a rotation, or speed of a user node, such as UE, or other environmental reasons leading the beam pair link quality to change significantly since the last beam report or beam refinement. Hence, there is room for improvement in the CSI reporting procedures.SUMMARY

[0003] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

[0004] Example embodiments may enable handling both event-based CSI reports and non-event-based CSI reports in a same framework. In an embodiment, the UE is configured to notify the network of a triggered event for CSI reporting using at least one uplink resource associated with the event to provide the notification, and receive a response from the network node to the triggered event. The UE may then determine to transmit at least one of the eventbased CSI report or non-event-based CSI reports simultaneously available with the event-based CSI report based on prioritization rules set by the network or preconfigured at the UE. This may be achieved by the features of the independent claims. Further implementation forms are provided in the dependent claims, the description, and the drawings.

[0005] According to a first aspect, a user node may comprise at least one processor; and at least one memory including instructions which, when executed by the at least one processor, cause the user node at least to receive, from a network node, a configuration for non- event-based channel state information, CSI, reporting and event-based CSI reporting; receive, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; receive, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; detect that the event has been triggered based on measurements performed by the user node; transmit the uplink signal using the at least one uplink resource to notify the network node of the event has been triggered; receive, from the network node, an uplink grant in response to the uplink signal; and transmit, to the network node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting available to be transmitted on a same slot, wherein the user node is configured to prioritize at least one of the event-based CSI reporting or the one or more non-event-based CSI reporting.

[0006] According to an example embodiment of the first aspect, the uplink signal comprises a scheduling request, an uplink reference signal, a sounding reference signal, or a contention-free physical random access channel preamble.

[0007] According to an example embodiment of the first aspect, the uplink grant is received with at least one of an information element or a codepoint field configured to indicate that the uplink grant is associated with the uplink signal.

[0008] According to an example embodiment of the first aspect, the user node is configured to select the event-based CSI reporting or the one or more non-event-based CSI reporting for the transmission.

[0009] According to an example embodiment of the first aspect, the user node is configured to prioritize the event-based CSI reporting and one or more types of the non-event- based CSI reporting with an equal priority.

[0010] According to an example embodiment of the first aspect, the one or more types of non-even-based CSI reporting comprise aperiodic CSI reporting.

[0011] According to an example embodiment of the first aspect, the at least one memory comprises instructions which, when executed by the at least one processor, cause the user node to multiplex the event-based CSI reporting and the one or more non-event-based CSI reporting on a same uplink resource based on the configured prioritization.

[0012] According to a second aspect, a network node comprises at least one processor; and at least one memory including instructions which, when executed by the at least one processor, cause the network node at least to transmit, to a user node, a configuration for non- event-based channel state information, CSI, reporting and event-based CSI reporting; transmit, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; transmit, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; receive, from the user node, the uplink signal notifying that the event has been triggered via the at least one uplink resource; transmit, to the user node, an uplink grant in response to the uplink signal; and receive, from the user node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting.

[0013] According to an example embodiment of the second aspect, the uplink signal comprises a scheduling request, an uplink reference signal, a sounding reference signal, or a contention-free physical random access channel preamble.

[0014] According to an example embodiment of the second aspect, the uplink grant is transmitted with at least one of an information element or a codepoint field configured to indicate that the uplink grant is associated with the uplink signal.

[0015] According to an example embodiment of the second aspect, the event-based CSI reporting and the one or more non-event-based CSI reporting are received on a same uplink resource.

[0016] According to a third aspect, a method may comprise receiving, from a network node, a configuration for non-event-based channel state information, CSI, reporting and eventbased CSI reporting; receiving, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; receiving, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; detecting that the event has been triggered based on measurements performed by the user node; transmitting the uplink signal using the at least one uplink resource to notify the network node of the event has been triggered; receiving, from the network node, an uplink grant in response to the uplink signal; and transmitting, to the network node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting available to be transmitted on a same slot, wherein the user node is configured to prioritize at least one of the event-based CSIreporting or the one or more non-event-based CSI reporting. The method may be performed by a user node.

[0017] According to an example embodiment of the third aspect, the uplink signal comprises a scheduling request, an uplink reference signal, a sounding reference signal, or a contention-free physical random access channel preamble.

[0018] According to an example embodiment of the third aspect, the uplink grant is received with at least one of an information element or a codepoint field configured to indicate that the uplink grant is associated with the uplink signal.

[0019] According to an example embodiment of the third aspect, the user node is configured to select the event-based CSI reporting or the one or more non-event-based CSI reporting for the transmission.

[0020] According to an example embodiment of the third aspect, the user node is configured to prioritize the event-based CSI reporting and one or more types of the non-event- based CSI reporting with an equal priority.

[0021] According to an example embodiment of the third aspect, the one or more types of non-even-based CSI reporting comprise aperiodic CSI reporting.

[0022] According to an example embodiment of the third aspect, the method comprises multiplexing the event-based CSI reporting and the one or more non-event-based CSI reporting on a same uplink resource based on the configured prioritization.

[0023] According to a fourth aspect, a method may comprise transmitting, to a user node, a configuration for non-event-based channel state information, CSI, reporting and eventbased CSI reporting; transmitting, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; transmitting, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; receiving, from the user node, the uplink signal notifying that the event has been triggered via the at least one uplink resource; transmitting, to the user node, an uplink grant in response to the uplink signal; and receiving, from the user node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting. The method may be performed by a network node.

[0024] According to an example embodiment of the fourth aspect, the uplink signal comprises a scheduling request, an uplink reference signal, a sounding reference signal, or a contention-free physical random access channel preamble.

[0025] According to an example embodiment of the fourth aspect, the uplink grant is transmitted with at least one of an information element or a codepoint field configured to indicate that the uplink grant is associated with the uplink signal.

[0026] According to an example embodiment of the fourth aspect, the event-based CSI reporting and the one or more non-event-based CSI reporting are received on a same uplink resource.

[0027] According to a fifth aspect, a computer program may be configured, when executed by a processor, to cause a device at least to perform the following: receive, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; receive, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; receive, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; detect that the event has been triggered based on measurements performed by the user node; transmit the uplink signal using the at least one uplink resource to notify the network node of the event has been triggered; receive, from the network node, an uplink grant in response to the uplink signal; and transmit, to the network node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting available to be transmitted on a same slot, wherein the user node is configured to prioritize at least one of the event-based CSI reporting or the one or more non-event-based CSI reporting. The computer program may further comprise instructions for causing the device to perform any example embodiment of the method of the third aspect.

[0028] According to a sixth aspect, a device may comprise means for receiving, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; means for receiving, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; means for receiving, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; detecting that the event has been triggered based on measurements performed by the user node; means for transmitting the uplink signal using the at least one uplink resource to notify the network node of the event has been triggered; means for receiving, from the network node, an uplink grant in response to the uplink signal; and means for transmitting, to the network node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting available to be transmitted on a same slot, wherein the user node is configured to prioritize at least one of the event-based CSI reporting or the one or more non- event-based CSI reporting. The device may further comprise means for performing any example embodiment of the method of the third aspect.

[0029] According to a seventh aspect, a computer program may comprise instructions for causing a device to perform at least the following: transmit, to a user node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; transmit, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; transmit, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the eventbased CSI reporting; receive, from the user node, the uplink signal notifying that the event has been triggered via the at least one uplink resource; transmit, to the user node, an uplink grant in response to the uplink signal; and receive, from the user node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting. The computer program may further comprise instructions for causing the device to perform any example embodiment of the method of the fourth aspect.

[0030] According to an eighth aspect, a device may comprise means for transmitting, to a user node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; means for transmitting, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; means for transmitting, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; means for receiving, from the user node, the uplink signal notifying that the event has been triggered via the at least one uplink resource; means for transmitting, to the user node, an uplink grant in response to the uplink signal; and means for receiving, from the user node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting. The device may further comprise means for performing any example embodiment of the method of the fourth aspect.

[0031] Many of the attendant features will be more readily appreciated as they become better understood by reference to the following detailed description considered in connection with the accompanying drawings.DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are included to provide a further understanding of the example embodiments and constitute a part of this specification, illustrate example embodiments and together with the description help to explain the example embodiments. In the drawings:

[0033] FIG. 1 illustrates an example of an example of a method for multiplexing multiple CSI reports into an uplink resource according to an example embodiment;

[0034] FIG. 2 illustrates an example of a message sequence chart between a user node and a network node for event-based CSI reporting according to an example embodiment;

[0035] FIG. 3 illustrates an example of an apparatus configured to practice one or more example embodiments;

[0036] FIG. 4 illustrates an example of a method for event-based CSI reporting according to an example embodiment;

[0037] FIG. 5 illustrates an example of a method for assisting in event-based CSI reporting according to an example embodiment;

[0038] FIG. 6 illustrates an example of a method for event-based CSI reporting according to another example embodiment;

[0039] FIG. 7 illustrates an example of a method for assisting in event-based CSI reporting according to another example embodiment;

[0040] FIG. 8 illustrates an example of a method for event-based CSI reporting according to another example embodiment; and

[0041] FIG. 9 illustrates an example of a method for assisting in event-based CSI reporting according to another example embodiment.

[0042] Like references may be used to designate like parts in the accompanying drawings.DETAILED DESCRIPTION

[0043] Reference will now be made in detail to example embodiments, examples of which are illustrated in the accompanying drawings. The detailed description provided below in connection with the appended drawings is intended as a description of the present examples and is not intended to represent the only forms in which the present examples may be constructed or utilized. The description sets forth the functions of the example and a possiblesequence of operations for constructing and operating the example. However, the same or equivalent functions and sequences may be accomplished by different examples.

[0044] This specification is related to 3GPP 5G NR and 6G physical layer design. In the 3GPP 5G NR, the UE can be configured with one or multiple CSI reporting configurations. Further, each CSI reporting configuration can be configured to report at least one of the following: Ll-RSRP (Layer-1 reference signal received power), Ll-SINR (Layer-1 signal to interference and noise ratio), PMI (pre-coding matrix indicator), RI (rank indicator), CQI (channel quality indicator), etc. Ll-RSRP and Ll-SINR may be used for beam measurement reporting and PMI, RI and CQI for CSI reporting. Further, each reporting configuration can be configured to have a time domain behavior: periodic, semi-persistent or aperiodic. The UE performs the measurements based on received downlink reference signals that may be transmitted in periodic, semi-persistent or aperiodic manner. The UE can then report the prepared CSI report(s) to the network using uplink resources.

[0045] There may be multiple CSI reports available at a time the UE is having UL (uplink) resources for the transmission of CSI reports. The UE can perform multiplexing and prioritization among the CSI reports and report the certain CSI reports in UL resource(s) according to predefined rules, e.g., as defined in 3GPP TS 38.213, section 9.2.5. For instance, different CSI reports may be having different pre-configured priorities. In the NR CSI reporting framework, there may be multiple CSI reports and resources to be handled that occur simultaneously. The UE may be configured, for example, to transmit a single CSI report having the highest priority, or to multiplex multiple CSI reports based on their priorities. When the beam and CSI reporting are fully controlled and scheduled by the gNB, the gNB may not be aware of occurred beam / channel changes. In order to address this kind of a situation, UE- initiated / event-driven beam reporting, with possible subsequent beam switching, may be used to reduce overhead (reducing a need for high periodicity beam reporting) and latency.

[0046] An objective is to support event-based CSI reporting, e.g., for event-based beam reporting, in the CSI reporting framework. Hence, a UE may be configured both for eventbased reporting and non-event-based reporting. Further, the UE may be configured to indicate to the network when an event triggering an event-based LI CSI report has occurred via an uplink resource associated with the event. For example, the UE may be configured to use an UL information element or information may be modulated into uplink signal transmission (e.g., on / off keying for configured periodic scheduling request resource (PUCCH resource) to notify the network about the triggered event based on the associated UL resource. After receiving aresponse from network associated with the indicated event trigger, the UE may determine to transmit one or more CSI reports from a plurality of available CSI reports based on prioritization rules. In an embodiment, the network may have a control which CSI reports the UE reports to the network in case of the simultaneously available event-based and non-event- based CSI reports. For example, the network can be configured to indicate via a DCI, a RRC or a MAC CE message which of the available CSI report(s) are to be transmitted by the UE in a next uplink resource after the triggered event. Alternatively, prioritization of transmission of CSI reports in the case of simultaneously available event-based and non-event-based CSI reports may be pre-configured at the UE.

[0047] An example embodiment may enable to trigger the event-based CSI report for situations where the networks may not be aware of a potential need for a beam switch, for example in case of a blockage. Further, prioritization between the non-event-based CSI reports and the event-based CSI reports is enabled, as well transmission of both types of CSI reports on the same UL resource based on the prioritization. Hence, UL reporting overhead can be reduced.

[0048] FIG. 1 illustrates an example of multiplexing multiple CSI reports into an uplink resource from a perspective of a UE according to an example embodiment.

[0049] A reporting domain of the UE may be divided into a non-event-based reporting domain and an event-based reporting domain. The UE may be configured by a network node with multiple CSI reporting configurations, both for the event-based CSI reporting and the non- event-based CSI reporting. The non-event-based CSI reports may comprise, for example, periodic CSI reports. The event-based CSI reports may comprise, for example, CSI reports triggered by LI UE events. The UE may be configured to continuously measure downlink reference signals, and detect when a LI UE event occurs according to one or more conditions and parameters configured by the network for the event-based CSI reporting. For example, an (LI UE) event may be that the UE notices a change in the current serving beam or a change in last reported beam(s), where the change can be in terms of RSRP difference more than a certain threshold. Further, the event may be associated with at least one UL resource by the network node that the UE is configured to use to indicate to the network node that the event has triggered. For example, scheduling request resource(s) (certain physical uplink control channel, PUCCH, resources) may be explicitly associated to the LI UE event, i.e., upon the certain LIUE event, such as an event to send beam / CSI report to the network, the UE can be configured to transmit a positive SR (scheduling request) to the network.

[0050] The at least one uplink resource associated with the event could also be, for example, an UL resource for transmitting a contention-free PRACH (physical random-access channel) preamble. In addition, or alternatively, the at least one UL resource may comprise UL SRS (sounding reference signal) resource(s) associated with a UL SRS resource set with some specific usage. One example of the UL SRS resource set could be: ‘beamManagement, antennaSwitching, codebook, non-codebook, positioning’.

[0051] Lor example, the UE may detect that an event 110 has triggered for an eventbased CSI report 104 (e.g., Ll-RSRP report). The UE may then transmit an uplink signal associated with the event 110 to the network node to declare that the event 110 has occurred on a reporting resource domain. Lor example, the UE can send a scheduling request 112 to the network node asking for an UL resource to report the event-based CSI report 104.

[0052] The UE may be then configured to monitor for a response from the network node to the scheduling request 112. The UE may be configured to expect the network response after a minimum delay 114. There can be an association between the certain scheduling request resource (associated to a certain LI UE event) and certain network response. The network node may respond, for example, with a UL grant through a downlink control information (DCI) 116. DCI may refer to dynamic physical layer control messages from network to UE(s) containing aspects of downlink and / or uplink data scheduling. The DCI 116 can have a certain information element indicating that this specific DCI on PDCCH (physical downlink control channel) is also providing response to the LI UE event (event 110) indicated via the certain scheduling request resource.

[0053] Alternatively, there can be configured for example one or more certain UL SRS resource ID(s) (associated with the UL signal reporting the UE LI event) and a corresponding network response (e.g., the DCI 116). The DCI 116 may be configured to have a new codepoint field defined to indicate the DCI provides the response or some existing codepoint field is repurposed to provide the indication, such as the last entry of SRS request codepoint, which is currently reserved.

[0054] After receiving the DCI 116, the UE may determine if transmission of the eventbased CSI report 104 needs to be prioritized. Lor example, there may be a time slot with time and frequency UL resources commonly shared for the non-event-based and event-based CSI reporting. Further, based on the non-event-based CSI reporting configurations, the UE mayhave two CSI reports 100, 102 simultaneously available with the event-based CSI report 104 to be transmitted during a next UL resource 118 for CSI reporting.

[0055] In an embodiment, the UE may be configured to determine which of the CSI reports should be prioritized based on an indication received from the network node. The indication may be comprised, for example, in the network response (e.g., DCI 116). Alternatively, the indication may be received by the UE through higher layers, such as in a RRC configuration. Radio resource control (RRC) may refer to provision of radio resource related control data. Radio resource control messages may be transmitted on various logical control channels such as for example a common control channel (CCCH) or a dedicated control channel (DCCH). Logical control channels may be mapped to one or more signaling radio bearers (SRBs). Alternatively, the indication may be received by the UE via MAC CE signaling. Hence, the network node may instruct the UE how to perform the prioritization after the network is notified about the triggered event, or beforehand.

[0056] For example, the network node may indicate to the UE to prioritize the eventbased CSI report 104 over the non-event-based CSI report 100, 102. Alternatively, the network node may indicate the UE to prioritize the non-event-based CSI reports 100, 102 over the eventbased CSI report 104. Based on the indication, the UE may for example first fill the next UL resource 118 for CSI reporting with the event-based CSI report, and then fill the UL resource with a lower priority non-event-based CSI report if there is still room. The network node may also indicate the UE to select the event-based CSI report 104 over the non-event-based CSI reports 100, 102, or vice versa. For example, the network node may detect that there is a limited amount of UL resources available for the CSI reporting. The network node may then indicate in the DCI 116 that scheduled UL resources are for provisioning the event-based CSI report 104. The indication in the DCI 116 may comprise, for example, a bit field indicating scheduling of UL resources for event-based reporting. Alternatively, the indication may be in a DCI format. The indication may also have a separate radio network temporary identifier (RNTI) (certain UE specific RNTI is used to mask cyclic redundancy check, CRC, of the DCI) based on which the UE monitors the PDCCH, specifically used for scheduling event triggered reports.

[0057] The UE may transmit one or more of the CSI reports 100, 102, 104 according to the indicated selection / prioritization instructions received from the network node on the next UL resource 118.

[0058] In an embodiment, the prioritization rules may be preconfigured at the UE. For example, after receiving the network response with UL grant, the UE may retrieve instructionsfrom its memory to decide whether to prioritize the event-based CSI report 104 in case there are multiple CSI reports to be transmitted. Instead of receiving the prioritization rules determined by the network in response to being notified of the triggered event, the UE may be configured to follow the preconfigured prioritization rules. For example, the UE may be configured to prioritize the event-based CSI reports. Alternatively, the event-based CSI reports may be configured to be treated with equal priority with one or more other types of CSI reports. For example, the event-based CSI reports may be configured to have an equal priority with aperiodic CSI reports. The UE may be configured to execute transmission of the one or more available CSI reports according to the preconfigured prioritization rules after receiving an uplink grant from the network node in response to notifying the network node about the triggered event. The prioritization rules configured at the UE may be based, for example, on a standard.

[0059] After the transmission on the UL resource 118, and when no new event has been triggered, the UE may be configured to transmit on a next UL resource 120 non-event-based CSI report(s) (e.g., Ll-RSRP report 106 and / or CSI report 108) available for transmission based on other configured multiplexing rules for reporting, i.e., without use of the prioritization rules triggered by the event. Hence, the UE may be configured to apply different prioritization and multiplexing rules for different CSI report transmissions.

[0060] FIG. 2 illustrates an example of a flow chart for CSI reporting between a user node and a network node. The user node may be, for example, a UE 200. The network node may be, for example, a gNB supporting 5G new radio (NR) or a Node B supporting 6G (6gNB) 202. The UE 200 may communicate with the 6gNB 202 via wireless radio channel(s). Communications between the UE 200 and the 6gNB 202 may be bidirectional. Hence, any of the devices may be configured to operate as a transmitter and / or a receiver.

[0061] At 204, the UE 200 may be configured to indicate to the 6gNB 202 capability of event-based LI CSI reporting, such as for beam reporting.

[0062] At 206, the 6gNB 202 may configure the UE 200 for both non-event-based CSI reporting and event-based CSI reporting. The event-based CSI reporting can be, for example, Ll-RSRP reporting / beam reporting.

[0063] At 208, the 6gNB 202 may be configured to send, to the UE 200, a configuration of one or more conditions and parameters for triggering the event. In addition, the 6gNB 202 may be configured to send, to the UE 200, UL resources explicitly associated with the event. The UL resources may be, for example, scheduling request resources to be used by the UE 200to notify the 6gNB 202 about the triggered event. The configurations may be performed via RRC / MAC CE signaling messages. The MAC CE signaling may be also used by the 6gNB 202, for example, to activate or deactivate CSI reporting.

[0064] At 210, the UE 200 may trigger the event for CSI report based on measurements performed by the UE 200. The UE may measure the parameters configured by the 6gNB 202 and detect when the one or more conditions are met.

[0065] At 212, the UE 200 may be configured to transmit an uplink signal associated with the event on an uplink resource indicated at 208. For example, the UE may transmit a scheduling request to the 6gNB 202 on the next scheduling request occasion (PUSCCH resource).

[0066] At 214, the UE 200 may be configured to monitor for a network response to the uplink signal. The network response may refer to a DL signal associated with the UL signal sent at 212. The network response may comprise an UL grant. For example, the UE 200 may monitor a certain PDCCH for a DCI associated with the scheduling request transmission.

[0067] At 216, the 6gNB 202 may transmit the network response, e.g., the DCI, to the UE 200.

[0068] At 218, the UE 200 may be configured to detect the network response associated with the transmitted UL signal, such as the DCI associated with the scheduling request transmission.

[0069] After receiving the network response, at 220, the UE 200 may be configured to select / prioritize the event-based CSI report to be transmitted on the next uplink resources having enough resources for the CSI report.

[0070] In an embodiment, the UE 200 may read from the DCI that the UE should prioritize or select the event-based CSI reporting in case there are multiple CSI reports available. For example, the DCI may indicate at least one of the following: whether to transmit the event-based CSI report associated with the LI UE event or non- event-based CSI report(s) according to existing rules in case there are both event-based and non-event-based CSI report(s) to be transmitted by the UE 200 in the same slot, whether to prioritize event-based CSI report associated with the LI UE event over the non-event-based CSI report(s) or not in case there are both event-based and non-event-based CSI report(s) to be transmitted by the UE 200 in the same slot.

[0071] In an embodiment, the UE 200 may be indicated by the 6gNB 202 to prioritize or select the event-based CSI report in a higher layer configuration, such as in the RRCsignaling message. The RCC may be configured to indicate which one is prioritized or selected by the UE 200 over the other: the event-based CSI report or one or more non-event-based CSI reports in case of simultaneously available for the transmission. For example, the indication for prioritization / selection may be received by the UE 200 in the same RRC or MAC CE message which configured the event triggering the event-based CSI reporting.

[0072] In an embodiment, the 6gNB 202 may be configured to provide the indication to prioritize or select the event-based CSI report in MAC CE signaling. The MAC CE may be configured to indicate which one is prioritized or selected over the other: the event-based CSI report or one or more non-event-based CSI reports in case of simultaneously available for the transmission.

[0073] In an embodiment, the prioritization or selection of the event-based CSI report may be determined by the UE 200 without an indication from the network. For example, the UE may be preconfigured to prioritize the event-based CSI report over one or more types of non-event-based CSI reports.

[0074] At 220, the UE 200 may be configured to transmit the CSI report for the event to the 6gNB 202 based on the performed prioritization / selection.

[0075] FIG. 3 illustrates an example of a device configured to perform one or more example embodiments.

[0076] The device 300 may comprise at least one processor 302. The at least one processor 302 may comprise, for example, one or more of various processing devices, such as for example a co-processor, a microprocessor, a controller, a digital signal processor (DSP), a processing circuitry with or without an accompanying DSP, or various other processing devices including integrated circuits such as, for example, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a microcontroller unit (MCU), a hardware accelerator, a special-purpose computer chip, or the like.

[0077] The device 300 may further comprise at least one memory 304. The at least one memory 304 may be configured to store, for example, computer program code 306 or the like, for example operating system software and application software. The at least one memory 304 may comprise one or more volatile memory devices, one or more non-volatile memory devices, and / or a combination thereof. For example, the at least one memory 304 may be embodied as magnetic storage devices (such as hard disk drives, magnetic tapes, etc.), optical magnetic storage devices, or semiconductor memories (such as mask ROM, PROM (programmable ROM), EPROM (erasable PROM), flash ROM, RAM (random access memory), etc.).

[0078] The device 300 may further comprise one or more communication interfaces 308 configured to enable the device 300 to transmit information to other devices and to receive information from other devices. The communication interface 308 may be configured to provide at least one wireless radio connection, such as for example a 3 GPP mobile broadband connection (e.g. 3G, 4G, 5G, or beyond). However, the communication interface 308 may be configured to provide one or more other type of connections, for example a wireless local area network (WLAN) connection such as for example standardized by IEEE 802.11 series or WiFi alliance; a short range wireless network connection such as for example a Bluetooth, NFC (near-field communication), or RFID connection; a wired connection such as for example a local area network (LAN) connection, a universal serial bus (USB) connection or an optical network connection, or the like; or a wired Internet connection. The communication interface 308 may comprise, or be configured to be coupled to, at least one antenna to transmit and / or receive radio frequency signals. One or more of the various types of connections may be also implemented as separate communication interfaces, which may be coupled or configured to be coupled to a plurality of antennas.

[0079] The device 300 may comprise for example a computing device such as for example a base station, a network node, a server device, a client node, a mobile phone, a tablet computer, a laptop, or the like. Although the device 300 is illustrated as a single device it is appreciated that, wherever applicable, functions of device 300 may be distributed to a plurality of devices.

[0080] When the device 300 is configured to implement some functionality, some component and / or components of the device 300, such as for example the at least one processor 302 and / or the memory 304, may be configured to implement this functionality. Furthermore, when the at least one processor 302 is configured to implement some functionality, this functionality may be implemented using program code 306 comprised, for example, in the memory 304.

[0081] In an embodiment, the device 300 may be a network node and configured to perform at least the functionalities of the network node described herein. The network node may be a base station, such as a 5G or a 6G NodeB. A network node may be also referred to as a network device or a radio access network (RAN) node. Although depicted as a single device, a network node may not be a stand-alone device, but for example a distributed computing system coupled to a remote radio head.

[0082] The network node may be configured to transmit, to a user node, configurations for event-based CSI reporting and non-event-based CSI reporting. The network node may be further configured to configure the user node to trigger an event for CSI reporting, and notify the network node about the triggered event via certain UL resource(s). The network node may be further configured to send to the UE a response associated with the certain UL resource(s). In an embodiment, the network node may be further configured to indicate to the user node to whether to prioritize or select the event-based CSI report or non-event-based CSI report(s) in case both CSI report types are simultaneously available. The indication may be provided, for example, via a DCI, a RCC or a MAC CE message.

[0083] In an embodiment, the device 300 may be a user node, such as a UE, and configured to perform at least the functionalities of the UE described herein. A user node may be also referred to as a client node or a user device. The user node may be configured to receive, from a network node, a configuration to trigger an event for CSI reporting, wherein the event is associated with UL resource(s). Based on the associated UL resource(s), the user node may be configured to notify the network node about the triggered event. The user node may be configured to determine, based on an indication received from the network node or based on a preset configuration, whether to prioritize or select the event-based CSI report or non-event- based CSI report(s) to be transmitted to the network node in case both CSI report types are simultaneously available for transmission. The indication may be received, for example, via a DCI, a RCC or a MAC CE message. Hence, depending on implementation, the indication may be received from the network node in response to the notified event, or before the event has been triggered.

[0084] The functionality described herein may be performed, at least in part, by one or more computer program product components such as software components. According to an embodiment, the device 300 comprises a processor or processor circuitry, such as for example a microcontroller, configured by the program code when executed to execute the embodiments of the operations and functionality described. Alternatively, or in addition, the functionality described herein can be performed, at least in part, by one or more hardware logic components. For example, and without limitation, illustrative types of hardware logic components that can be used include Field-programmable Gate Arrays (FPGAs), application-specific Integrated Circuits (ASICs), application-specific Standard Products (ASSPs), System-on-a-chip systems (SOCs), Complex Programmable Logic Devices (CPLDs), Graphics Processing Units (GPUs).

[0085] The device 300 comprises means for performing at least one method described herein. In one example, the means comprises the at least one processor 302, the at least one memory 304 including program code 306 configured to, when executed by the at least one processor 302, cause the device 300 to perform the method.

[0086] FIG. 4 illustrates an example of a method for event-based CSI reporting according to an example embodiment. The method 400 may be performed, for example, by a user node.

[0087] At 402, the method may comprise receiving, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting.

[0088] At 404, the method may comprise receiving, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting.

[0089] At 406, the method may comprise receiving, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting.

[0090] At 408, the method may comprise detecting that the event has been triggered based on measurements performed by the user node.

[0091] At 410, the method may comprise transmitting an uplink signal using the at least one uplink resource to notify the network node of the event has been triggered.

[0092] In an embodiment, the method may comprise receiving, from the network node, a downlink signal in response to the uplink signal. The downlink signal may comprise an indication to prioritize at least one of the event-based CSI report or one or more non-event- based CSI reports available to be transmitted on a same slot. The method may further comprise transmitting, to the network node, at least one of the event-based CSI report or the one or more available non-event-based CSI reports in response to the downlink signal. The user node may be configured to transmit the event-based CSI report and / or the one or more non-event-based reports based on the indicated prioritization.

[0093] FIG. 5 illustrates an example of a method for assisting event-based CSI reporting according to an example embodiment. The method 500 may be performed, for example, by a network node.

[0094] At 502, the method may comprise transmitting, to a user node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting.

[0095] At 504, the method may comprise transmitting, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting.

[0096] At 506, the method may comprise transmitting, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting.

[0097] At 508, the method may comprise receiving, from the user node, an uplink signal notifying that the event has been triggered via the at least one uplink resource.

[0098] In an embodiment, the method may comprise transmitting, to the user node, a downlink signal in response to the uplink signal. The downlink signal may comprise an indication to prioritize the event-based CSI report or one or more non-event-based CSI reports available to be transmitted on a same slot. The method may further comprise receiving, from the user node, at least one of the event-based CSI report or the one or more non-event-based CSI reports in response to the downlink signal. At least one of the event-based CSI report or the one or more non-event-based CSI reports may be received from the user node based on the indicated prioritization.

[0099] FIG. 6 illustrates an example of a method for event-based CSI reporting according to another example embodiment. The method 600 may be performed, for example, by a user node.

[0100] At 602, the method may comprise receiving, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting.

[0101] At 604, the method may comprise receiving, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting.

[0102] At 606, the method may comprise receiving, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting.

[0103] At 608, the method may comprise detecting that the event has been triggered based on measurements performed by the user node.

[0104] At 610, the method may comprise transmitting an uplink signal using the at least one uplink resource to notify the network node of the event has been triggered,

[0105] At 612, the method may comprise receiving, from the network node, an uplink grant in response to the uplink signal.

[0106] At 614, the method may comprise transmitting, to the network node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event- based CSI reporting available to be transmitted in a same slot, wherein the user node is configured to prioritize at least one of the event-based CSI reporting or the non-event-based CSI reporting.

[0107] FIG. 7 illustrates an example of a method for assisting event-based CSI reporting according to another example embodiment. The method 700 may be performed, for example, by a network node.

[0108] At 702, the method may comprise transmitting, to a user node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting.

[0109] At 704, the method may comprise transmitting, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting.

[0110] At 706, the method may comprise transmitting, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting.

[0111] At 708, the method may comprise receiving, from the user node, an uplink signal notifying that the event has been triggered via the at least one uplink resource.

[0112] At 710, the method may comprise transmitting, to the user node, an uplink grant in response to the uplink signal.

[0113] At 712, the method may comprise receiving, from the user node in response to the uplink grant, at least one of the event-based CSI reporting or one or more non-event-based CSI reporting.

[0114] FIG. 8 illustrates an example of a method of a method for event-based CSI reporting according to another example embodiment. The method 800 may be performed, for example, by a user node.

[0115] At 802, the method may comprise receiving, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting.

[0116] At 804, the method may comprise receiving, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting.

[0117] At 806, the method may comprise receiving, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting.

[0118] At 808, the method may comprise receiving, from the network node, an indication to prioritize at least one of the event-based CSI reporting or non-event-based CSI reporting when available to be transmitted on a same slot. The indication may be included, for example, in a higher layer configuration or in MAC CE signaling.

[0119] At 810, the method may comprise detecting that the event has been triggered based on measurements performed by the user node.

[0120] At 812, the method may comprise transmitting an uplink signal using the at least one uplink resource to notify the network node of the event has been triggered.

[0121] At 814, the method may comprise receiving, from the network node, an uplink grant in response to the uplink signal.

[0122] At 816, the method may comprise transmitting after the uplink grant, to the network node, at least one of the event-based CSI reporting or one or more non-event-based CSI reporting available to be transmitted in a same slot based on the received indication.

[0123] FIG. 9 illustrates an example of a method for assisting event-based CSI reporting according to another example embodiment. The method 900 may be performed, for example, by a network node.

[0124] At 902, the method may comprise transmitting, to a user node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting.

[0125] At 904, the method may comprise transmitting, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting.

[0126] At 906, the method may comprise transmitting, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting.

[0127] At 908, the method may comprise transmitting, to the user node, an indication to prioritize at least one of the event-based CSI reporting or non-event-based CSI reporting when available to be transmitted on a same slot. The indication may be included, for example, in a higher layer configuration or in MAC CE signaling.

[0128] At 910, the method may comprise receiving, from the user node, an uplink signal notifying that the event has been triggered via the at least one uplink resource.

[0129] At 912, the method may comprise transmitting, to the user node, an uplink grant in response to the uplink signal.

[0130] At 914, the method may comprise receiving, from the user node in response to the uplink grant, at least one of the event-based CSI reporting or one or more non-event-based CSI reporting.

[0131] Further features of the methods directly result from the functionalities and parameters of the apparatuses, as described in the appended claims and throughout the specification and are therefore not repeated here. It is noted that one or more operations of the method may be performed in different order.

[0132] A device, for example a network node or a user node, may be configured to perform or cause performance of any aspect of the method(s) described herein. Further, a computer program may comprise instructions for causing, when executed, an apparatus to perform any aspect of the method(s) described herein. Further, an apparatus may comprise means for performing any aspect of the method(s) described herein. According to an example embodiment, the means comprises at least one processor, and memory including program code, the at one memory and the program code configured to, when executed by the at least one processor, cause performance of any aspect of the method(s).

[0133] Any range or device value given herein may be extended or altered without losing the effect sought. Also, any embodiment may be combined with another embodiment unless explicitly disallowed.

[0134] Although the subj ect matter has been described in language specific to structural features and / or acts, it is to be understood that the subject matter 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 examples of implementing the claims and other equivalent features and acts are intended to be within the scope of the claims.

[0135] It will be understood that the benefits and advantages described above may relate to one embodiment or may relate to several embodiments. The embodiments are not limited to those that solve any or all of the stated problems or those that have any or all of the stated benefits and advantages. It will further be understood that reference to 'an' item may refer to one or more of those items.

[0136] The operations of the methods described herein may be carried out in any suitable order, or simultaneously where appropriate. Additionally, individual blocks may be deleted from any of the methods without departing from the scope of the subject matter described herein. Aspects of any of the embodiments described above may be combined withaspects of any of the other embodiments described to form further embodiments without losing the effect sought.

[0137] The term 'comprising' is used herein to mean including the method, blocks, or elements identified, but that such blocks or elements do not comprise an exclusive list and a method or apparatus may contain additional blocks or elements.

[0138] 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) with software / firmware and (ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and (c) hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation. This definition of circuitry applies to all uses of this term in this application, including in any claims.

[0139] 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.

[0140] It will be understood that the above description is given by way of example only and that various modifications may be made by those skilled in the art. The above specification, examples and data provide a complete description of the structure and use of exemplary embodiments. Although various embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from scope of this specification.

Claims

CLAIMS1. A user node, comprising: at least one processor; and at least one memory including instructions which, when executed by the at least one processor, cause the user node at least to: receive, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; receive, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; receive, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; detect that the event has been triggered based on measurements performed by the user node; transmit the uplink signal using the at least one uplink resource to notify the network node of the event has been triggered; receive, from the network node, an uplink grant in response to the uplink signal; and transmit, to the network node, in response to the uplink grant at least one of the eventbased CSI reporting or one or more non-event-based CSI reporting available to be transmitted on a same slot, wherein the user node is configured to prioritize at least one of the event-based CSI reporting or the one or more non-event-based CSI reporting.

2. The user node of claim 1, wherein the uplink signal comprises a scheduling request, an uplink reference signal, a sounding reference signal, or a contention-free physical random access channel preamble.

3. The user node of any preceding claim, wherein the uplink grant is received with at least one of an information element or a codepoint field configured to indicate that the uplink grant is associated with the uplink signal.

4. The user node of any preceding claim, wherein the user node is configured to select the event-based CSI reporting or the one or more non-event-based CSI reporting for the transmission.

5. The user node of any of claims 1 to 4, wherein the user node is configured to prioritize the event-based CSI reporting and one or more types of the non-event-based CSI reporting with an equal priority.

6. The user node of claim 5, wherein the one or more types of non-even-based CSI reporting comprise aperiodic CSI reporting.

7. The user node of claim 5 or 6, wherein the at least one memory comprises instructions which, when executed by the at least one processor, cause the user node to: multiplex the event-based CSI reporting and the one or more non-event-based CSI reporting on a same uplink resource based on the configured prioritization.

8. A network node, comprising: at least one processor; and at least one memory including instructions which, when executed by the at least one processor, cause the network node at least to: transmit, to a user node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; transmit, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; transmit, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; receive, from the user node, the uplink signal notifying that the event has been triggered via the at least one uplink resource; transmit, to the user node, an uplink grant in response to the uplink signal; and receive, from the user node, in response to the uplink grant at least one of the eventbased CSI reporting or one or more non-event-based CSI reporting.

9. The network node of claim 8, wherein the uplink signal comprises a scheduling request, an uplink reference signal, a sounding reference signal, or a contention-free physical random access channel preamble.

10. The network node of claim 8 or 9, wherein the uplink grant is transmitted with at least one of an information element or a codepoint field configured to indicate that the uplink grant is associated with the uplink signal.

11. The network node of any of claims 8 to 10, wherein the event-based CSI reporting and the one or more non-event-based CSI reporting are received on a same uplink resource.

12. A method carried out by a user node, comprising: receiving, from a network node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; receiving, from the network node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; receiving, from the network node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting; detecting that the event has been triggered based on measurements performed by the user node; transmitting the uplink signal using the at least one uplink resource to notify the network node of the event has been triggered; receiving, from the network node, an uplink grant in response to the uplink signal; and transmitting, to the network node, in response to the uplink grant at least one of the event-based CSI reporting or one or more non-event-based CSI reporting available to be transmitted on a same slot, wherein the user node is configured to prioritize at least one of the event-based CSI reporting or the one or more non-event-based CSI reporting.

13. A method carried out by a network node, comprising: transmitting, to a user node, a configuration for non-event-based channel state information, CSI, reporting and event-based CSI reporting; transmitting, to the user node, a configuration of at least one condition to trigger an event for the event-based CSI reporting; transmitting, to the user node, a configuration of at least one uplink resource, wherein the at least one uplink resource is associated with the event for the event-based CSI reporting;receiving, from the user node, the uplink signal notifying that the event has been triggered via the at least one uplink resource; transmitting, to the user node, an uplink grant in response to the uplink signal; and receiving, from the user node, in response to the uplink grant at least one of the event- based CSI reporting or one or more non-event-based CSI reporting.

14. A computer program comprising instructions which, when the program is executed by a device, cause the device to carry out the method of claim 12 or 13.

15. A computer-readable medium comprising instructions which, when executed by a device, cause the device to carry out the method of claim 12 or 13.

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