WO2024011630A1

WO2024011630A1 - Method and apparatus related to channel state information reporting

Info

Publication number: WO2024011630A1
Application number: PCT/CN2022/106101
Authority: WO
Inventors: Tao Tao; Naizheng ZHENG; Daniela Laselva; Matha DEGHEL
Original assignee: Nokia Shanghai Bell Co., Ltd.; Nokia Solutions And Networks Oy; Nokia Technologies Oy
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2024-01-18

Abstract

A technique comprising sending from a radio access node to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

Description

METHOD AND APPARATUS RELATED TO CHANNEL STATE INFORMATION REPORTING

TECHNICAL FIELD

Various example embodiments relate to apparatus, a method, and a computer program, and in particular, but not exclusively to apparatus, methods and computer programs related to channel state information reporting.

BACKGROUND

Channel state information (CSI) reporting by a user equipment (UE) may involve a radio access node preparing the UE to report channel state information according to a plurality of reporting configurations, including one more reporting configurations for which CSI reporting is dependent on a trigger transmission to the UE.

SUMMARY

A method, comprising: sending from a radio access node to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

Preparing the user equipment may comprise providing the user equipment with an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.

Preparing the user equipment may comprise configuring the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.

The second reporting configuration may be a default configuration according to which the user equipment reports channel state information for one or more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.

The first reporting configuration may be an aperiodic-type reporting configuration, and the second reporting configuration may be a periodic-type or semi-persistent-type reporting configuration.

The trigger transmission may trigger the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for which the user equipment reports channel state information according to the first reporting configuration.

A reference signal resource for the first reporting configuration may have one or more of the following features in comparison to a reference signal resource for the second reporting configuration: reduced number of antenna ports; and/or reduced time-frequency resources; and/or reduced transmission power.

The method may comprise: for one or more time intervals for which the trigger transmission triggers the user equipment to report channel state information according to the first reporting configuration, interrupting the transmission of reference signals according to at least one reference signal resource associated with the second reporting configuration and instead transmitting reference signals according to at least one reference signal resource associated with the first reporting configuration.

A method, comprising: receiving at a user equipment from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and receiving the trigger transmission at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

The one or more messages may comprise an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.

The one or more messages may configure the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.

The second reporting configuration may be a default reporting configuration according to which the user equipment reports channel state information for one more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.

The trigger transmission may trigger the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for a slot for which the user equipment reports channel state information according to the first reporting configuration.

A radio access node, comprising: means for sending to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and means for sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

The radio access node may comprise: means for, for one or more time intervals for which the trigger transmission triggers the user equipment to report channel state information according to the first reporting configuration, interrupting the transmission of reference signals according to at least one reference signal resource associated with the second reporting configuration and instead transmitting reference signals according to at least one reference signal resource associated with the first reporting configuration.

User equipment, comprising: means for receiving from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and means for receiving the trigger transmission, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A radio access node comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the radio access node to perform: sending to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

The at least one memory and computer program code may be configured to, with the at least one processor, cause the radio access node to adopt: for one or more time intervals for which the trigger transmission triggers the user equipment to report channel state information according to the first reporting configuration, interrupting the transmission of reference signals according to at least one reference signal resource associated with the second reporting configuration and instead transmitting reference signals according to at least one reference signal resource associated with the first reporting configuration.

User equipment comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the user equipment to perform: receiving from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and receiving the trigger transmission, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A radio access node, comprising: sending circuitry for sending to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and sending circuitry for sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A user equipment, comprising: receiving circuitry for receiving from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and receiving circuitry for receiving the trigger transmission, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A computer readable medium comprising program instructions stored thereon for performing: sending from a radio access node to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A computer readable medium comprising program instructions stored thereon for performing: receiving at a user equipment from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and receiving the trigger transmission at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A non-transitory computer readable medium comprising program instructions stored thereon for performing: sending from a radio access node to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A non-transitory computer readable medium comprising program instructions stored thereon for performing: receiving at a user equipment from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and receiving the trigger transmission at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A computer program comprising computer executable code which when run on at least one processor is configured to cause a radio access node at least to: send to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and send the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

A computer program comprising computer executable code which when run on at least one processor is configured to cause a user equipment at least to: receive from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and receive at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.

In the above, many different aspects have been described. It should be appreciated that further aspects may be provided by the combination of any two or more of the aspects described above.

Various other aspects are also described in the following detailed description and in the attached claims.

BRIEF DESCRIPTION OF THE FIGURES

Some example embodiments will now be described in further detail, by way of example only, with reference to the following examples and accompanying drawings, in which:

Figure 1 shows a representation of an example of an architecture to which embodiments may be applied;

Figure 2 shows a representation of an example of operations of a user equipment and gNB in the architecture of Figure 1, according to example embodiments;

Figure 3 shows a representation of an example of switching to an energy-saving mode for the CSI-RS for a UE, according to some example embodiments;

Figure 4 shows a representation of interrupting periodic CSI-reporting according to some example embodiments;

Figure 5 shows a representation of an example of UE operations according to some example embodiments.

Figure 6 shows a representation of an example of apparatus for implementing the user equipment functionality of the user equipment of the architecture of Figure 1 or gNB functionality in the architecture of Figure 1, according to some example embodiments;

Figure 7 shows a representation of an example of an antenna array for the radio unit of gNB in the architecture of Figure 1, according to some example embodiments; and

Figure 8 shows a representation of an example of non-volatile memory media, according to some example embodiments.

DETAILED DESCRIPTION

By way of example, the following description focusses on the example of transmissions between a user equipment (UE) and a radio access node operating according to 3GPP 5G technology, but the underlying technique may also be applicable to transmissions between user equipment and access network operating according to other technologies, such as more evolved 3GPP technologies.

Figure 1 shows an example of a 5G NR architecture for a connection between a UE and a data network (DN) via a radio access node (gNB) of a radio access network (RAN) and a 5G core network (5G CN) .

The term “user equipment” (UE) may refer to any device, apparatus or component implementing at least 3GPP user equipment (UE) functionality.

The UE may be a mobile or static device (e.g. a portable or non-portable computing device) including, but not limited to, the following types of devices: mobile phone, smartphone, personal digital assistant (PDA) , handset, device using a wireless modem (alarm or measurement device, etc. ) , laptop and/or touch screen computer, tablet, game console, notebook, and multimedia device. It should be appreciated that a UE device may also be a nearly exclusive uplink only device, of which an example is a camera or video camera loading images or video clips to a network. A UE device may also be a device having capability to operate in Internet of Things (IoT) network which is a scenario in which objects are provided with the ability to transfer data over a network without requiring human-to-human or human-to-computer interaction, e.g. to be used in smart power grids and connected vehicles. The device may also utilise cloud. In some applications, a UE device may comprise a user portable device with radio parts (such as a watch, earphones or eyeglasses) and the computation is carried out in the cloud.

5G enables using multiple input –multiple output (MIMO) antennas, and may involve large numbers of base stations (gNBs) including macro sites operating in co-operation with smaller stations and employing a variety of radio technologies depending on service needs, use cases and/or spectrum available. 5G mobile communications supports a wide range of use cases and related applications including video streaming, augmented reality, different ways of data sharing and various forms of machine type applications (such as (massive) machine-type communications (mMTC) , including vehicular safety, different sensors and real-time control) . 5G may employ multiple radio interfaces, e.g. below 6GHz or above 24 GHz, cmWave and mmWave, and may also be integrable with existing legacy radio access technologies, such as LTE. Integration with LTE may be implemented, as a system, where macro coverage is provided by LTE and 5G radio interface access comes from small cells by aggregation to the LTE. In other words, 5G may support both inter-RAT operability (such as LTE-5G) and inter-RI operability (inter-radio interface operability, such as below 6GHz –cmWave, 6 or above 24 GHz –cmWave and mmWave) . 5G networks may employ network slicing, in which multiple independent and dedicated virtual sub-networks (network instances) may be created within the same infrastructure to run services that have different requirements on latency, reliability, throughput and mobility.

Low latency applications and services may be facilitated by bringing content close to the 5G system, which leads to local break out and multi-access edge computing (MEC) . 5G enables analytics and knowledge generation to occur at the source of the data. This approach may involve leveraging resources that may not be continuously connected to a network such as laptops, smartphones, tablets and sensors. MEC provides a distributed computing environment for application and service hosting. It also has the ability to store and process content in close proximity to cellular subscribers for faster response time. Edge computing covers a wide range of technologies such as wireless sensor networks, mobile data acquisition, mobile signature analysis, cooperative distributed peer-to-peer ad hoc networking and processing also classifiable as local cloud/fog computing and grid/mesh computing, dew computing, mobile edge computing, cloudlet, distributed data storage and retrieval, autonomic self-healing networks, remote cloud services, augmented and virtual reality, data caching, Internet of Things (massive connectivity and/or latency critical) , critical communications (autonomous vehicles, traffic safety, real-time analytics, time-critical control, healthcare applications) .

5G may also utilize satellite communication to enhance or complement the coverage of 5G service, for example by providing backhauling. Possible use cases are providing service continuity for machine-to-machine (M2M) or Internet of Things (IoT) devices or for passengers on board of vehicles, Mobile Broadband, (MBB) or ensuring service availability for critical communications, and future railway/maritime/aeronautical communications.

Satellite communication may utilise geostationary earth orbit (GEO) satellite systems, but also low earth orbit (LEO) satellite systems, in particular mega-constellations (systems in which hundreds of (nano) satellites are deployed) . Each satellite in the mega-constellation may cover several satellite-enabled network entities that create on-ground cells. The on-ground cells may be created through an on-ground relay node or by a gNB located on-ground or in a satellite.

Radio transmissions for UE are transmitted from an antenna array of a radio unit (RU) of the gNB. Achieving a good radio link between the gNB and the UE involves the gNB acquiring information about the state of the radio channel between the gNB and the UE. This channel state information (CSI) is acquired by transmitting reference signals (CSI-RS) from individual antenna ports of the antenna array (or individual groups of antenna ports) via respective radio resources defined by frequency, time and coding; and receiving CSI reports from the UE based on results of the measurements of those reference signals at the UE.

In addition to acquiring downlink (DL) channel state information, the CSI-RS may also be used, for example, to derive measurements for mobility and beam management, and for interference measurements.

A CSI-RS resource for a UE may be defined by a number of physical transmission parameters including: frequency allocation within a physical resource block (PRB) for the UE; time-domain allocation within a PRB for the UE; and transmission power. The UE may be configured to make and report measurements for one or more CSI-RS resources on a periodic, semi-persistent, or aperiodic basis. For example, a CSI-RS resource may include physical resources for CSI-RS from up to 1, 2, 4, 8, 16 or 32 antenna ports of the antenna array of the gNB. CSI-RS for the UE are transmitted for each of the antenna ports via a respective combination of physical resources (frequency, radio, coding) within a PRB for the UE. The PRB may comprise 12 OFDM sub-carriers in the frequency domain and 1 slot in the time domain. The density of CSI-RS transmissions is configurable for each CSI-RS resource. For example, the density may be 0.5, 1, or 3.

In the time domain, a CSI-RS resource may start at any OFDM symbol within the slot, and the number of slots over which CSI-RS resource spans within the PRB may comprise 1, 2 or 4 OFDM symbols, depending on the number of gNB antenna ports for the CSI-RS resource.

As mentioned above, reporting of CSI may be done on a periodic, semi-persistent or aperiodic basis. CSI-RS resource sets may be classified into periodic-type CSI-RS resources, semi-persistent-type CSI-RS resources and aperiodic-type CSI-RS resources. There may be restrictions on what type of reporting may be done for each of these resource types. For example: a CSI-RS resource classed as a periodic-type resource may be used to generate any of the three types of CSI reports sent to the gNB; a CSI-RS resource set classed as a semi-persistent-type or periodic-type resource may be used for semi-persistent CSI reporting; and a CSI-resource classed as an aperiodic-type resource may be used for aperiodic CSI reporting.

Figure 2 shows a representation of operations at gNB and UE according to an example embodiment.

OPERATIONS 100 and 110: In this example, gNB prepares UE for making periodic CSI reports for a periodic-type CSI-RS resource, and prepares UE for making aperiodic CSI reports for a reduced CSI-RS resource. In this example, these operations 110 and 110 comprise gNB sending to UE one or more RRC messages including one or more csi-MeasConfig IEs (information elements) according to 3GPP TS38.311. csi-MeasConfig IE are used to configure CSI-RS channel state information reports to be transmitted on PUCCH on the serving cell and channel state information reports on PUSCH triggered by DCI received on the serving cell. The one or more csi-MeasConfig IEs include one or more csi-ReportConfigToAddModList IEs according to 3GPP TS38.311. The one or more csi-ReportConfigToAddModList IEs include at least two CSI-ReportConfig IEs according to 3GPP TS38.311. One of the two CSI-ReportConfig IEs is used to configure periodic reports sent on PUCCH, and one of the two CSI-ReportConfig IEs is used to configure aperiodic reports sent on PUSCH triggered by DCI.

The CSI-ReportConfig IE used to configure the periodic reporting includes the following:

(i) a reportConfigId IE according to 3GPP TS38.311:

(ii) a resourcesForChannelMeasurement IE according to 3GPP TS38.311, indicating a set of physical resources for CSI-RS within a PRB, via (inter alia) a CSI-ResourceConfig IE according to 3GPP TS38.311 and a NZP-CSI-RS-Resource IE according to 3GPP TS38.311. The NZP-CSI-RS-Resource IE includes: (a) a CSI-RS-resourceMapping IE according to 3GPP TS38.311, and (b) a powerControlOffset IE according to 3GPP TS38.311, indicating the transmission power of NZP CSI-RS. The CSI-RS-resourceMapping IE includes (1) an indication of the frequency domain allocation within a PRB; (2) an indication of the number of antenna ports for which CSI-RS are transmitted within the PRB, and (3) an indication of the density of the CSI-RS resource measured in RE per antenna port per PRB.

(iii) a reportConfigType IE according to 3GPP TS38.311, indicating that the report type is periodic, not requiring any DCI trigger transmission.

The CSI-ReportConfig IE used to configure the aperiodic reporting includes the following:

(i) a reportConfigId IE according to 3GPP TS38.311:

(ii) a resourcesForChannelMeasurement IE according to 3GPP TS38.311 indicating a set of physical resources for CSI-RS within a PRB, via (inter alia) a CSI-ResourceConfig IE according to 3GPP TS38.311 and a NZP-CSI-RS-Resource IE according to 3GPP TS38.311. The NZP-CSI-RS-Resource IE includes: (a) a CSI-RS-resourceMapping IE according to 3GPP TS38.311, and (b) a powerControlOffset IE according to 3GPP TS38.311, indicating the transmission power of NZP CSI-RS. The CSI-RS-resourceMapping IE includes (1) an indication of the frequency domain allocation within a PRB; (2) an indication of the number of antenna ports for which CSI-RS are transmitted within the PRB, and (3) an indication of the density of the CSI-RS resource measured in RE per antenna port per PRB. In this example, the aperiodic report configuration is characterised (in comparison to the periodic report configuration) by one or more energy-saving features, such as: smaller number of antenna ports and/or smaller density and/or lower power transmission.

(iii) a reportConfigType IE according to 3GPP TS38.311, indicating that the report type is aperiodic requiring a DCI trigger transmission; and additionally

(iv) an extra IE linking this aperiodic report configuration to the above-described periodic report configuration by reference to the reportConfigID of the periodic report configuration.

OPERATION 120: gNB determines to save energy for CSI-RS transmissions for UE in slot #N, by adopting one or more reduced CSI-RS transmission parameters for slot#N. With reference to Figure 3, it may be for example that data transmissions by gNB to another UE (UE#1) in one or more preceding slots (#N-1 etc.. ) involve a relatively small number of antenna ports (e.g. 16 ports) , and that gNB has determined in such a situation to use the same small number of antenna ports for CSI-RS in the subsequent slot #N. In the example shown in Figure 3, the periodic reporting configuration for UE#2 may involve a CSI-RS resource for 32 antenna ports; and gNB may determine in the situation shown in Figure 3 to break from transmitting CSI-RS for UE#2 from 32 antenna ports in line with the periodic reporting configuration for UE#2, and instead transmit CSI-RS for UE#2 from a reduced number of antenna ports matching the number of antenna ports used for downlink data transmissions to UE#1 in slots #N-2 and #N-1.

OPERATION 130: gNB makes a DCI trigger transmission triggering UE to do CSI reporting according to the aperiodic reporting configuration based on measurements of CSI-RS transmitted in slot #N. As mentioned above, the aperiodic reporting configuration includes an aperiodic triggering offset value, which defines the offset (number of slots) between the slot containing the DCI trigger transmission, and the slot to which the DCI trigger transmission relates (i.e. the slot containing the CSI-RS whose measurements are to be reported according to the aperiodic reporting configuration) .

OPERATION 140: gNB breaks from making CSI-RS transmissions for UE in slot#N according to the CSI-RS resource for the periodic reporting configuration, and instead makes CSI-RS transmissions for UE in slot #N according to the reduced CSI-RS resource for the aperiodic reporting configuration.

OPERATION 150: For slot #N; the explicit link to the periodic reporting configuration in the aperiodic reporting configuration has the effect that UE is configured to override the periodic reporting configuration for the slot for which aperiodic reporting (according to the aperiodic reporting configuration) is triggered by the DCI transmission. In slot #N, UE makes measurements on the physical resources mapped to the reduced CSI-RS resource for the aperiodic reporting configuration; and UE breaks from reporting CSI according to the periodic reporting configuration, and instead reports CSI according to the aperiodic reporting configuration based on measurements for the reduced CSI-RS resource.

As mentioned above, Figure 3 shows a representation of one example of the above-described technique in action. Data transmissions involving 16 antenna ports are scheduled for another UE#2 in slots #N-2 and #N-1, and CSI-RS transmissions for UE#1 are scheduled in slot#N. UE#1 is configured with a periodic reporting configuration involving periodic CSI-RS resource (P-CSI-RS) for N ₁ antenna ports, wherein N ₁ is 32, and an aperiodic reporting configuration involving aperiodic CSI-RS resource (A-CSI-RS) for N ₂ antenna ports, wherein N ₂ is 16. The aperiodic reporting configuration is linked to the periodic reporting configuration in the way described above. As part of energy-saving operations, gNB determines to transmit reduced (16 port) CSI-RS for UE#1 in slot#N, instead of 32-port CSI-RS, following the 16-port data transmissions to UE#2 in slots #N-2 and #N-1. gNB sends a DCI trigger transmission to UE#1 triggering CSI reporting according to the aperiodic reporting configuration for slot#N. The above-described link between the aperiodic reporting configuration (involving CSI-RS resource for 16 antenna ports) and the periodic reporting configuration (involving CSI-RS resource for 32 antenna ports) causes UE#1 to break from using the periodic reporting configuration for slot#N, and instead only do CSI reporting for slot #N according to the aperiodic reporting configuration. Above values for N ₁ and N ₂ are examples, and other values are possible as well. For example, N ₁ can be 64 or 16, and N ₂ can be 32 or 8 correspondingly, i.e. N ₂ = N ₁/2. In other examples, N ₂ = N ₁/K, wherein K ≥ 2. In general, N ₂ < N ₁, i.e. N ₂ is reduced value when compared to N ₁.

With reference to Figure 4, in this example, the default, periodic reporting configuration involves UE measuring the periodic CSI-RS resource for UE at a periodicity of m slots and reporting CSI according to the periodic reporting configuration. In response to receiving a DCI trigger at slot# (n-a) triggering CSI reporting according to the aperiodic reporting configuration for slot#n, UE interrupts periodic CSI reporting for slot#n, and instead reports CSI according to the aperiodic reporting configuration based on measurements in slot#n of the reduced CSI-RS resource associated with the aperiodic reporting configuration. For slot#n, UE ignores the CSI-RS resource associated with the periodic reporting configuration, and does not make a periodic CSI-report (P-CSI report) . The aperiodic CSI reporting temporarily overrides the periodic CSI reporting for slot#n. From the next periodic slot# (n+m) , UE resumes periodic CSI reporting according to the periodic reporting configuration, based on measurements of the CSI-RS resource associated with the periodic reporting configuration. From the gNB point of view: gNB periodically transmits CSI-RS for UE on the CSI-RS resource associated with the periodic reporting configuration for UE; gNB interrupts these periodic CSI-RS transmissions for slot#n , and instead transmits CSI-RS for UE on the reduced CSI-RS resource associated with the aperiodic reporting configuration for UE;and resumes the transmission of CSI-RS for UE on the CSI-RS resource associated with the periodic reporting configuration for UE from slot# (n+m) .

Figure 5 shows a representation of this example of UE operations. UE determines whether UE has received a DCI trigger transmission (OPERATION 500) . If the result of this determination is positive, UE interrupts periodic CSI reporting for the next periodic CSI-RS slot; UE ignores the periodic CSI-RS resource for the slot and instead measures the reduced CSI-RS resource associated with the aperiodic reporting configuration; and UE sends an aperiodic CSI report, without sending a periodic CSI-RS report (OPERATION 510) . On the other hand, of the result of the determination is negative (no DCI trigger has been received) , UE continues with periodic CSI reporting for the next periodic CSI-RS slot; UE measures the CSI-RS resource associated with the periodic reporting configuration, and sends a periodic CSI report (OPERAITON 520) . This set of operations repeats itself for each periodic CSI-RS slot for UE.

In the above-described example, RRC messages are used for preparing the UE for periodic and aperiodic CSI reporting, but according to another example, other downlink transmissions may be used to prepare the UE, such as MAC (Medium Access Control) CEs (Control Elements) .

In the above-described example, the aperiodic reporting configuration includes an explicit link to the periodic reporting configuration. In another example: there may be no such explicit link, but UE may be configured with a general prioritization rule according to which UE overrides a periodic reporting configuration for a slot #N in response to being triggered by e.g. a DCI trigger transmission to make an aperiodic report for slot#N according to an aperiodic reporting configuration involving a CSI-RS resource at least partially overlapping with the CSI-RS resource for the periodic reporting configuration.

In the above-described example, an aperiodic reporting configuration is linked to a periodic reporting configuration, but in another example, an aperiodic reporting configuration is linked to a semi-persistent (SP) reporting configuration.

In the above-described techniques, configuring the UE to override a periodic reporting configuration for a slot#N in which gNB is transmitting CSI-RS from a reduced transmission parameters (e.g., reduced number of antenna port) better avoids the gNB receiving corrupted CSI reports from the UE, and better reduces the risk of e.g. wrong link adaptation, incorrect detection of radio link failure, beam failure etc..

One advantage of the techniques described above is that they facilitate energy-saving operations at the gNB with less impact on the performance of UEs and the RAN, which can improve key system level KPIs such as energy efficiency and sustainability.

Figure 6 illustrates an example of an apparatus for implementing UE functionality in the architecture of Figure 1, or for implementing gNB functionality in the architecture of Figure 1. The apparatus may include at least one processor 802 coupled to one or more interfaces 808. In the case of UE, the one or more interfaces 808 may include one or more interfaces to e.g. other equipment/component (s) for which the UE functionality provides radio communications. In the case of gNB, the one or more interfaces 808 may include one or more interfaces to one or more nodes implementing functionality of the core network. The at least one processor 802 is also coupled to a radio unit 804 including one or more antennas etc. for making and receiving radio transmissions. As shown in Figure 7, the radio unit 804 may include an antenna array comprising an array of antenna elements 810 (physical antenna ports) . The gNB may map each antenna port mentioned above to a respective one of the antenna elements 810. The at least one processor 802 may also be coupled to at least one memory 806. The at least one processor 802 may be configured to execute an appropriate software code to perform the operations described above. The software code may be stored in the memory 806.

Figure 8 shows a schematic representation of non-volatile memory media 1100a (e.g. computer disc (CD) or digital versatile disc (DVD) ) and 1100b (e.g. universal serial bus (USB) memory stick) storing instructions and/or parameters 1102 which when executed by a processor allows the processor to perform one or more of the steps of the methods described previously.

It is to be noted that example embodiments may be implemented as circuitry, in software, hardware, application logic or a combination of software, hardware and application logic. In an example embodiment, the application logic, software or an instruction set is maintained on any computer program product or computer-readable medium. In the context of this document, a "computer-readable medium" may be any media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as the radio access nodes or user equipment of the above-described example embodiments. 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) .

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 (and/or firmware) , 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 the user equipment or radio access nodes of the above-described embodiments, to perform various functions) and (c) hardware circuit (s) and/or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g. firmware) for operation, but the software may not be present when it is not needed for operation. This definition of 'circuitry' applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term "circuitry" also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. The term "circuitry" also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

The features, advantages, and characteristics described herein can be combined in any suitable manner in one or more example embodiments. One skilled in the relevant art will recognize that such example embodiments can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages can be recognized in certain embodiments that may not be present in all example embodiments. One having ordinary skill in the art will readily understand that the example embodiments as discussed above may be practiced with steps in a different order, and/or with hardware elements in configurations which are different than those which are disclosed. Therefore, although some embodiments have been described based upon these example embodiments, it would be apparent to those of skill in the art that certain modifications, variations, and alternative constructions would be apparent, while remaining within the spirit and scope of example embodiments.

For example, example embodiments are described above in the context of a 5G system, but the same kind of techniques may also be applicable to other existing radio access systems, e.g. Wi-Fi, and also to future systems, e.g. 6G.

Claims

A method, comprising:

sending from a radio access node to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
The method according to claim 1, wherein preparing the user equipment comprises providing the user equipment with an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.
The method according to claim 1, wherein preparing the user equipment comprises configuring the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.
The method according to any preceding claim, wherein the second reporting configuration is a default configuration according to which the user equipment reports channel state information for one or more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.
The method according to any preceding claim, wherein the first reporting configuration is an aperiodic-type reporting configuration, and wherein the second reporting configuration is a periodic-type or semi-persistent-type reporting configuration.
The method according to any preceding claim, wherein the trigger transmission triggers the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for which the user equipment reports channel state information according to the first reporting configuration.
The method according to any preceding claim, wherein a reference signal resource for the first reporting configuration has one or more of the following features in comparison to a reference signal resource for the second reporting configuration: reduced number of antenna ports; and/or reduced time-frequency resources; and/or reduced transmission power.
The method according to any preceding claim, comprising: for one or more time intervals for which the trigger transmission triggers the user equipment to report channel state information according to the first reporting configuration, interrupting the transmission of reference signals according to at least one reference signal resource associated with the second reporting configuration and instead transmitting reference signals according to at least one reference signal resource associated with the first reporting configuration.
A method, comprising:

receiving at a user equipment from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

receiving the trigger transmission at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
The method according to claim 9, wherein the one or more messages comprise an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.
The method according to claim 9, wherein the one or more messages configure the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.
The method according to any of claims 9 to 11, wherein the second reporting configuration is a default reporting configuration according to which the user equipment reports channel state information for one more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.
The method according to any of claims 9 to 12, wherein the first reporting configuration is an aperiodic-type reporting configuration, and wherein the second reporting configuration is a periodic-type or semi-persistent-type reporting configuration.
The method according to any of claims 9 to 13, wherein the trigger transmission triggers the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for a slot for which the user equipment reports channel state information according to the first reporting configuration.
The method according to any of claims 9 to 14, wherein a reference signal resource for the first reporting configuration has one or more of the following features in comparison to a reference signal resource for the second reporting configuration: reduced number of antenna ports; and/or reduced time-frequency resources; and/or reduced transmission power.
A radio access node, comprising:

means for sending to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

means for sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
The radio access node according to claim 16, wherein the one or more messages comprise an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.
The radio access node according to claim 17, wherein the one or more messages configure the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.
The radio access node according to any of claims 16 to 18, wherein the second reporting configuration is a default configuration according to which the user equipment reports channel state information for one or more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.
The radio access node according to any of claims 16 to 19, wherein the first reporting configuration is an aperiodic-type reporting configuration, and wherein the second reporting configuration is a periodic-type or semi-persistent-type reporting configuration.
The radio access node according to any of claims 16 to 20, wherein the trigger transmission triggers the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for which the user equipment reports channel state information according to the first reporting configuration.
The radio access node according to any of claims 16 to 21, wherein a reference signal resource for the first reporting configuration has one or more of the following features in comparison to a reference signal resource for the second reporting configuration: reduced number of antenna ports; and/or reduced time-frequency resources; and/or reduced transmission power.
The radio access node according to any of claims 16 to 22, comprising:

means for, for one or more time intervals for which the trigger transmission triggers the user equipment to report channel state information according to the first reporting configuration, interrupting the transmission of reference signals according to at least one reference signal resource associated with the second reporting configuration and instead transmitting reference signals according to at least one reference signal resource associated with the first reporting configuration.
User equipment, comprising:

means for receiving from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

means for receiving the trigger transmission, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
The user equipment according to claim 24, wherein the one or more messages comprise an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.
The user equipment according to claim 24, wherein the one or more messages configure the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.
The user equipment according to any of claims 24 to 26, wherein the second reporting configuration is a default reporting configuration according to which the user equipment reports channel state information for one more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.
The user equipment according to any of claims 24 to 27, wherein the first reporting configuration is an aperiodic-type reporting configuration, and wherein the second reporting configuration is a periodic-type or semi-persistent-type reporting configuration.
The user equipment according to any of claims 24 to 28, wherein the trigger transmission triggers the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for a slot for which the user equipment reports channel state information according to the first reporting configuration.
The user equipment according to any of claims 24 to 29, wherein a reference signal resource for the first reporting configuration has one or more of the following features in comparison to a reference signal resource for the second reporting configuration: reduced number of antenna ports; and/or reduced time-frequency resources; and/or reduced transmission power.
A radio access node comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the radio access node to perform:

sending to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
The radio access node according to claim 31, wherein the one or more messages comprise an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.
The radio access node according to claim 31, wherein the one or more messages configure the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.
The radio access node according to any of claims 31 to 33, wherein the second reporting configuration is a default configuration according to which the user equipment reports channel state information for one or more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.
The radio access node according to any of claims 31 to 34, wherein the first reporting configuration is an aperiodic-type reporting configuration, and wherein the second reporting configuration is a periodic-type or semi-persistent-type reporting configuration.
The radio access node according to any of claims 31 to 35, wherein the trigger transmission triggers the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for which the user equipment reports channel state information according to the first reporting configuration.
The radio access node according to any of claims 31 to 36, wherein a reference signal resource for the first reporting configuration has one or more of the following features in comparison to a reference signal resource for the second reporting configuration: reduced number of antenna ports; and/or reduced time-frequency resources; and/or reduced transmission power.
The radio access node according to any of claims 31 to 37, wherein the at least one memory and computer program code are configured to, with the at least one processor, cause the radio access node to adopt: for one or more time intervals for which the trigger transmission triggers the user equipment to report channel state information according to the first reporting configuration, interrupting the transmission of reference signals according to at least one reference signal resource associated with the second reporting configuration and instead transmitting reference signals according to at least one reference signal resource associated with the first reporting configuration.
User equipment comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the user equipment to perform:

receiving from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

receiving the trigger transmission, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
The user equipment according to claim 39, wherein the one or more messages comprise an indicator linking the first reporting configuration to the second reporting configuration, wherein the indicator configures the user equipment to interrupt reporting channel state information according to the second reporting configuration for one or more time intervals for which the user equipment is triggered to report channel state information according to the first reporting configuration.
The user equipment according to claim 39, wherein the one or more messages configure the user equipment to follow a prioritization rule according to which the user equipment refrains from reporting channel state information according to the second reporting configuration in response to a determination that a reference signal resource for the second reporting configuration overlaps with a reference signal resource for the first reporting configuration.
The user equipment according to any of claims 39 to 41, wherein the second reporting configuration is a default reporting configuration according to which the user equipment reports channel state information for one more slots for which the user equipment is not triggered to report channel state information according to the first reporting configuration.
The user equipment according to any of claims 39 to 42, wherein the first reporting configuration is an aperiodic-type reporting configuration, and wherein the second reporting configuration is a periodic-type or semi-persistent-type reporting configuration.
The user equipment according to any of claims 39 to 43, wherein the trigger transmission triggers the user equipment to ignore at least one reference signal resource associated with the second reporting configuration for a slot for which the user equipment reports channel state information according to the first reporting configuration.
The method according to any of claims 39 to 44, wherein a reference signal resource for the first reporting configuration has one or more of the following features in comparison to a reference signal resource for the second reporting configuration: reduced number of antenna ports; and/or reduced time-frequency resources; and/or reduced transmission power.
A radio access node, comprising:

sending circuitry for sending to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

sending circuitry for sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
A user equipment, comprising:

receiving circuitry for receiving from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

receiving circuitry for receiving the trigger transmission, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
A computer readable medium comprising program instructions stored thereon for performing:

sending from a radio access node to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
A computer readable medium comprising program instructions stored thereon for performing:

receiving at a user equipment from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

receiving the trigger transmission at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
A non-transitory computer readable medium comprising program instructions stored thereon for performing:

sending from a radio access node to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

sending the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
A non-transitory computer readable medium comprising program instructions stored thereon for performing:

receiving at a user equipment from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

receiving the trigger transmission at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
A computer program comprising computer executable code which when run on at least one processor is configured to cause a radio access node at least to:

send to a user equipment one or more messages preparing the user equipment to report channel state information according to a plurality of channel state information reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

send the trigger transmission to the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.
A computer program comprising computer executable code which when run on at least one processor is configured to cause a user equipment at least to:

receive from a radio access node one or more messages preparing the user equipment to report channel state information according to a plurality of reporting configurations, wherein the plurality of reporting configurations comprises at least a first reporting configuration for which channel state information reporting by the user equipment is dependent on a trigger transmission to the user equipment, and a second reporting configuration; and

receive at the user equipment, wherein the trigger transmission triggers the user equipment to interrupt reporting channel state information according to the second reporting configuration and instead report channel state information according to the first reporting configuration.