Aperiodic CSI measurements for multiple antenna pannels

Abstract

The disclosure relates to an apparatus comprising: means for determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; means for determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; means for performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; means for selecting a measurement amongst the multiple measurements; and means for reporting channel state information based on the selected measurement

Description

[0001] APERIODIC CSI MEASUREMENTS FOR MULTIPLE ANTENNA PANNELS

[0002] Field of the disclosure

[0003] The present disclosure relates to an apparatus, a method, and a computer program for aperiodic channel state information reporting in a communication system.

[0004] Background

[0005] A communication system can be seen as a facility that enables communication sessions between two or more entities such as communication devices, base stations and / or other nodes by providing carriers between the various entities involved in the communications path.

[0006] The communication system may be a wireless communication system. Examples of wireless systems comprise public land mobile networks (PLMN) operating based on radio standards such as those provided by 3GPP, satellite based communication systems and different wireless local networks, for example wireless local area networks (WLAN). The wireless systems can typically be divided into cells, and are therefore often referred to as cellular systems.

[0007] The communication system and associated devices typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved. Communication protocols and / or parameters which shall be used for the connection are also typically defined. Examples of standard are 4G, 5G or 6G standards.

[0008] Summary

[0009] According to an aspect there is provided an apparatus comprising: means for receiving, from a base station, downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and means for applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication.

[0010] The resource configuration may refer to aperiodic channel state information reference signal resource configuration.

[0011] The channel state information may comprise at least one of: a precoding matrix indicator; a channel quality indicator; a rank indicator; or a measurement of a measurement reference signal.

[0012] The measurement of the measurement reference signal may comprise: a measurement of a reference signal received power of the measurement reference signal; a measurement of a reference signal received quality of the measurement reference signal; or a measurement of a signal to noise plus interference ratio of the measurement reference signal.

[0013] The means for applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting may comprise: means for performing a measurement of a measurement signal based on at least one of the activated transmission configuration indicator state or the resource configuration; and means for reporting, to the base station, channel state information based on the measurement.

[0014] An activated transmission configuration indicator state may comprise: a first reference signal; a second reference signal; and a quasi-colocation type between the first reference signal and the second reference signal. The first reference signal may comprise a synchronisation signal block or a channel state information reference signal.

[0015] The second reference signal may comprise a channel state information reference signal.

[0016] The means for receiving downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: means for receiving, from the base station, downlink control information comprising an indication of an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; and wherein the means for applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication may comprise: means for applying the activated transmission configuration indicator state for aperiodic channel state information reporting based on the indication.

[0017] The downlink control information may comprise an indication of a codepoint associated to an activated transmission configuration indicator state identifier identifying the activated transmission configuration indicator state.

[0018] The association between a codepoint and an activated transmission configuration indicator state identifier may be specific to a transmission reception point (e.g., antenna panel) used by the base station to transmit the downlink control information.

[0019] The activated transmission configuration indicator state may comprise an indication of at least one of: a source reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state. The downlink control information may comprise an indication of at least one of: a source reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state.

[0020] The measurement reference signal may be specific to the activated transmission configuration indicator state.

[0021] The activated transmission configuration indicator state may comprise an indication of a quasi-colocation type D between the first reference signal and the second reference signal.

[0022] The means for receiving downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: means for receiving, from the base station, information comprising an indication that the resource configuration is to be applied for aperiodic channel state information reporting; and the means for applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication may comprise: means for applying the resource configuration for aperiodic channel state information reporting based on the indication.

[0023] The downlink control information may comprise an indication of a codepoint associated to the resource configuration. The apparatus may comprise: means for receiving, from the base station, downlink control information comprising an indication as to whether aperiodic channel state information reporting is requested.

[0024] Downlink control information may include a first field and a second field.

[0025] The size of the first field and / or the second field may be configured by the base station.

[0026] The first field may comprise an indication as to whether at least one activated transmission configuration indicator state is to be applied for aperiodic channel state information reporting.

[0027] The first field or the second field may comprise an indication at least one of: a source reference signal amongst the first reference signal and the second reference signal of an activated transmission configuration indicator state; or a measurement reference signal amongst the first reference signal and the second reference signal of an activated transmission configuration indicator state.

[0028] The second field may comprise an indication as to whether aperiodic channel state information reporting is requested.

[0029] The apparatus may comprise: means for receiving, from the base station, the resource configuration.

[0030] The resource configuration may comprise an indication of at least one of: a measurement reference signal for aperiodic channel state information reporting; or a measurement reference signal common for all activated transmission configuration indicator states for aperiodic channel state information reporting.

[0031] The resource configuration may be received via radio resource control. The apparatus may comprise: means for receiving, from the base station, information comprising an indication of a set of configured transmission configuration indicator states; and means for receiving, from the base station, information comprising an indication of a subset of activated transmission configuration indicator states amongst the set of configured transmission configuration indicator states.

[0032] The subset of activated transmission configuration indicator states may comprise at least one of: an activated transmission configuration indicator state for beam information reporting; an activated transmission configuration indicator state for aperiodic channel state information reporting; or an activated transmission configuration indicator state for beam information reporting and for aperiodic channel state information reporting.

[0033] The information comprising an indication of the set of at least one configured transmission configuration indicator state may be received via radio resource control; the information comprising an indication of the subset of at least one activated transmission configuration indicator state may be received via medium access control control element; and / or the downlink control information comprising an indication as to whether at least one of a activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may be received via physical downlink control channel.

[0034] According to an aspect there is provided a method comprising: receiving, from a base station, downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication. The resource configuration may refer to aperiodic channel state information reference signal resource configuration.

[0035] The channel state information may comprise at least one of: a precoding matrix indicator; a channel quality indicator; a rank indicator; or a measurement of a measurement reference signal.

[0036] The measurement of the measurement reference signal may comprise: a measurement of a reference signal received power of the measurement reference signal; a measurement of a reference signal received quality of the measurement reference signal; or a measurement of a signal to noise plus interference ratio of the measurement reference signal.

[0037] The applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting may comprise: performing a measurement of a measurement signal based on at least one of the activated transmission configuration indicator state or the resource configuration; and reporting, to the base station, channel state information based on the measurement.

[0038] An activated transmission configuration indicator state may comprise: a first reference signal; a second reference signal; and a quasi-colocation type between the first reference signal and the second reference signal.

[0039] The first reference signal may comprise a synchronisation signal block or a channel state information reference signal.

[0040] The second reference signal may comprise a channel state information reference signal. The receiving downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: receiving, from the base station, downlink control information comprising an indication of an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; and wherein the applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication may comprise: applying the activated transmission configuration indicator state for aperiodic channel state information reporting based on the indication.

[0041] The downlink control information may comprise an indication of a codepoint associated to an activated transmission configuration indicator state identifier identifying the activated transmission configuration indicator state.

[0042] The association between a codepoint and an activated transmission configuration indicator state identifier may be specific to a transmission reception point (e.g., antenna panel) used by the base station to transmit the downlink control information.

[0043] The activated transmission configuration indicator state may comprise an indication of at least one of: a source reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state.

[0044] The downlink control information may comprise an indication of at least one of: a source reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state. The measurement reference signal may be specific to the activated transmission configuration indicator state.

[0045] The activated transmission configuration indicator state may comprise an indication of a quasi-colocation type D between the first reference signal and the second reference signal.

[0046] The receiving downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: receiving, from the base station, information comprising an indication that the resource configuration is to be applied for aperiodic channel state information reporting; and the applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication may comprise: applying the resource configuration for aperiodic channel state information reporting based on the indication.

[0047] The downlink control information may comprise an indication of a codepoint associated to the resource configuration.

[0048] The method may comprise: receiving, from the base station, downlink control information comprising an indication as to whether aperiodic channel state information reporting is requested.

[0049] Downlink control information may include a first field and a second field.

[0050] The size of the first field and / or the second field may be configured by the base station. The first field may comprise an indication as to whether at least one activated transmission configuration indicator state is to be applied for aperiodic channel state information reporting.

[0051] The first field or the second field may comprise an indication at least one of: a source reference signal amongst the first reference signal and the second reference signal of an activated transmission configuration indicator state; or a measurement reference signal amongst the first reference signal and the second reference signal of an activated transmission configuration indicator state.

[0052] The second field may comprise an indication as to whether aperiodic channel state information reporting is requested.

[0053] The apparatus may comprise: receiving, from the base station, the resource configuration.

[0054] The resource configuration may comprise an indication of at least one of: a measurement reference signal for aperiodic channel state information reporting; or a measurement reference signal common for all activated transmission configuration indicator states for aperiodic channel state information reporting.

[0055] The resource configuration may be received via radio resource control.

[0056] The method may comprise: receiving, from the base station, information comprising an indication of a set of configured transmission configuration indicator states; and receiving, from the base station, information comprising an indication of a subset of activated transmission configuration indicator states amongst the set of configured transmission configuration indicator states.

[0057] The subset of activated transmission configuration indicator states may comprise at least one of: an activated transmission configuration indicator state for beam information reporting; an activated transmission configuration indicator state for aperiodic channel state information reporting; or an activated transmission configuration indicator state for beam information reporting and for aperiodic channel state information reporting.

[0058] The information comprising an indication of the set of at least one configured transmission configuration indicator state may be received via radio resource control; the information comprising an indication of the subset of at least one activated transmission configuration indicator state may be received via medium access control control element; and / or the downlink control information comprising an indication as to whether at least one of a activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may be received via physical downlink control channel.

[0059] According to an aspect there is provided an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: receiving, from a base station, downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication.

[0060] According to an aspect there is provided an apparatus comprising circuitry configured to perform: receiving, from a base station, downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication. According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: receiving, from a base station, downlink control information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and applying at least one of the activated transmission configuration indicator state or the resource configuration for aperiodic channel state information reporting based on the indication.

[0061] According to an aspect there is provided an apparatus comprising: means for transmitting, to a user equipment, information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and means for receiving, from the user equipment, channel state information based on at least one of the activated transmission configuration indicator state or the resource configuration.

[0062] The means for transmitting information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: means for transmitting, to the user equipment, information comprising an indication of an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting.

[0063] The means for transmitting information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: means for transmitting, to the user equipment, information comprising an indication that a resource configuration is to be applied for aperiodic channel state information reporting. According to an aspect there is provided a method comprising: transmitting, to a user equipment, information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and receiving, from the user equipment, channel state information based on at least one of the activated transmission configuration indicator state or the resource configuration.

[0064] The transmitting information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: transmitting, to the user equipment, information comprising an indication of an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting.

[0065] The transmitting information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting may comprise: transmitting, to the user equipment, information comprising an indication that a resource configuration is to be applied for aperiodic channel state information reporting.

[0066] According to an aspect there is provided an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: transmitting, to a user equipment, information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and receiving, from the user equipment, channel state information based on at least one of the activated transmission configuration indicator state or the resource configuration. According to an aspect there is provided an apparatus comprising circuitry configured to perform: transmitting, to a user equipment, information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and receiving, from the user equipment, channel state information based on at least one of the activated transmission configuration indicator state or the resource configuration.

[0067] According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: transmitting, to a user equipment, information comprising an indication as to whether at least one of an activated transmission configuration indicator state or a resource configuration is to be applied for aperiodic channel state information reporting; and receiving, from the user equipment, channel state information based on at least one of the activated transmission configuration indicator state or the resource configuration.

[0068] According to an aspect there is provided an apparatus comprising: means for determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; means for determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; means for performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; means for selecting a measurement amongst the multiple measurements; and means for reporting channel state information based on the selected measurement.

[0069] The multiple antenna configuration may comprise multiple antenna panels. The means for selecting a measurement amongst the multiple measurements may comprise: means for selecting a highest measurement amongst the multiple measurements.

[0070] The multiple measurements of the measurement reference signal may comprise: multiple measurements of a reference signal received power of the measurement reference signal; multiple measurements of a reference signal received quality of the measurement reference signal; or multiple measurements of a signal to noise plus interference ratio of the measurement reference signal.

[0071] The means for determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting may comprise: means for receiving downlink control information comprising an indication of the activated transmission configuration indicator state.

[0072] The downlink control information may indicate a codepoint associated to an activated transmission configuration indicator state identifier identifying the activated transmission configuration indicator state.

[0073] The activated transmission configuration indicator state may comprise: a first reference signal; a second reference signal; and a quasi-colocation type between the first reference signal and the second reference signal.

[0074] The first reference signal may comprise a synchronisation signal block or a channel state information reference signal.

[0075] The second reference signal may comprise a channel state information reference signal.

[0076] The activated transmission configuration indicator state may indicate at least one of: a source reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state.

[0077] The apparatus may comprise: means for receiving downlink control information comprising an indication of at least one of: a source reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state.

[0078] The activated transmission configuration indicator state may indicate a quasicolocation type D between the first reference signal and the second reference signal.

[0079] The channel state information may comprise at least one of: a precoding matrix indicator; a channel quality indicator; a rank indicator; or the selected measurement.

[0080] The apparatus may comprise: means for selecting the multiple antenna configurations detecting the measurement reference signal.

[0081] The means for reporting channel state information based on the measurement may comprise: means for reporting channel state information based on the measurement via the antenna configuration used to perform the selected measurement.

[0082] According to an aspect there is provided a method comprising: determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; selecting a measurement amongst the multiple measurements; and reporting channel state information based on the selected measurement.

[0083] The multiple antenna configuration may comprise multiple antenna panels.

[0084] The selecting a measurement amongst the multiple measurements may comprise: selecting a highest measurement amongst the multiple measurements.

[0085] The multiple measurements of the measurement reference signal may comprise: multiple measurements of a reference signal received power of the measurement reference signal; multiple measurements of a reference signal received quality of the measurement reference signal; or multiple measurements of a signal to noise plus interference ratio of the measurement reference signal.

[0086] The determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting may comprise: receiving downlink control information comprising an indication of the activated transmission configuration indicator state.

[0087] The downlink control information may indicate a codepoint associated to an activated transmission configuration indicator state identifier identifying the activated transmission configuration indicator state.

[0088] The activated transmission configuration indicator state may comprise: a first reference signal; a second reference signal; and a quasi-colocation type between the first reference signal and the second reference signal. The first reference signal may comprise a synchronisation signal block or a channel state information reference signal.

[0089] The second reference signal may comprise a channel state information reference signal.

[0090] The activated transmission configuration indicator state may indicate at least one of: a source reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state.

[0091] The method may comprise: receiving downlink control information comprising an indication of at least one of: a source reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state.

[0092] The activated transmission configuration indicator state may indicate a quasicolocation type D between the first reference signal and the second reference signal.

[0093] The channel state information may comprise at least one of: a precoding matrix indicator; a channel quality indicator; a rank indicator; or the selected measurement.

[0094] The method may comprise: selecting the multiple antenna configurations detecting the measurement reference signal. The reporting channel state information based on the measurement may comprise: reporting channel state information based on the measurement via the antenna configuration used to perform the selected measurement.

[0095] According to an aspect there is provided an apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to perform: determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; selecting a measurement amongst the multiple measurements; and reporting channel state information based on the selected measurement.

[0096] According to an aspect there is provided an apparatus comprising circuitry configured to perform: determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; selecting a measurement amongst the multiple measurements; and reporting channel state information based on the selected measurement.

[0097] According to an aspect there is provided a computer program comprising computer executable code which when run on at least one processor is configured to perform: determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; selecting a measurement amongst the multiple measurements; and reporting channel state information based on the selected measurement.

[0098] According to an aspect, there is provided a computer readable medium comprising program instructions stored thereon for performing at least one of the above methods.

[0099] According to an aspect, there is provided a non-transitory computer readable medium comprising program instructions stored thereon for performing at least one of the above methods.

[0100] According to an aspect, there is provided a non-volatile tangible memory medium comprising program instructions stored thereon for performing at least one of the above methods.

[0101] 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.

[0102] Various other aspects are also described in the following detailed description and in the attached claims.

[0103] List of abbreviations

[0104] AF: Application Function

[0105] AMF: Access and Mobility Management Function

[0106] BS: Base Station

[0107] CE: Control Element CSI: Channel State Information

[0108] CSI: Channel State Information Reference Signal

[0109] CU: Centralized Unit

[0110] CQI: Channel Quality Indicator

[0111] DCI: Downlink Control Information

[0112] DL: Downlink

[0113] DMRS: Demodulation Reference Signal gNB: gNodeB

[0114] ID: Identifier loT : Internet of Things

[0115] MAC CE : Medium Access Control Control Element

[0116] MS: Mobile Station

[0117] MTC: Machine Type Communication

[0118] NEF: Network Exposure Function

[0119] NF: Network Function

[0120] NR: New radio

[0121] NRF: Network Repository Function

[0122] PDCCH: Physical Downlink Control Channel

[0123] PDSCH: Physical Downlink Shared Channel

[0124] PMI: Precoding Matrix Indicator

[0125] RAM: Random Access Memory

[0126] (R)AN: (Radio) Access Network

[0127] Rl: Rank Indicator

[0128] ROM: Read Only Memory

[0129] RRC: Radio Resource Control

[0130] RS: Reference Signal

[0131] RSRP: Reference Signal Received Power

[0132] RSRQ: Reference Signal Received Quality

[0133] RX: Reception

[0134] SMF: Session Management Function

[0135] SNIR: Signal to Noise and Interference Ratio SSB: Synchronization Signal Block

[0136] TCI: Transmission Configuration Indicator

[0137] TX: Transmission

[0138] UE: User Equipment

[0139] 4G: 4thGeneration

[0140] 5G: 5thGeneration

[0141] 5GC: 5G Core network

[0142] 5GS: 5G System

[0143] 6G: 6thGeneration

[0144] Brief Description of the Figures

[0145] Embodiments will now be described, by way of example only, with reference to the accompanying Figures in which:

[0146] Fig. 1 shows a schematic representation of an example 5G system;

[0147] Fig. 2 shows a schematic representation of an example control apparatus;

[0148] Fig. 3 shows a schematic representation of an example user equipment;

[0149] Fig. 4 shows an example of radio resource signaling comprising an indication of a set of configured transmission configuration indicator states, a medium access control control element comprising an indication of a subset of activated transmission configuration indicator states and downlink control element comprising an indication as to whether an activated transmission configuration indicator state or an aperiodic channel state information reference signal resource configuration is to be applied for aperiodic channel state information reporting;

[0150] Fig. 5 shows a block diagram of an example of method for aperiodic channel state information reporting in a communication system; Fig. 6 shows a block diagram of an example of method for aperiodic channel state information reporting in a communication system;

[0151] Fig. 7 shows a block diagram of an example of method for aperiodic channel state information reporting in a communication system; and

[0152] Fig. 8 shows a schematic representation of an example non-volatile memory medium storing instructions which when executed by a processor allow a processor to perform one or more of the steps of the method of Fig. 5 to Fig.7.

[0153] Detailed Description of the Figures

[0154] In the following certain embodiments are explained with reference to mobile communication devices capable of communication via a wireless cellular system and mobile communication systems serving such mobile communication devices. Before explaining in detail the exemplifying embodiments, certain general principles of a wireless communication system, access systems thereof, and mobile communication devices are briefly explained with reference to Fig. 1 , Fig.2 and Fig.3 to assist in understanding the technology underlying the described examples.

[0155] FIG. 1 shows a schematic representation of an example of a 5G system (5GS). The 5GS may comprises user equipment (UEs), a (radio) access network ((R)AN), a 5G core network (5GC), one or more application functions (AF) and one or more data networks (DN).

[0156] The 5G (R)AN may comprise one or more gNodeBs (gNBs). The gNodeBs may comprise one or more gNB distributed unit functions connected to one or more gNB centralized unit functions.

[0157] The gNodeBs may comprise activator gNodeBs, reader gNodeBs or activator and reader gNodeBs. The 5GC may comprise an access and mobility management function (AMF), a session management function (SMF), an authentication server function (ALISF), a user data management (UDM), a user plane function (UPF), a network exposure function (NEF).

[0158] A 6G system (6GS) may be at least in part identical or different to a 5GS.

[0159] Fig. 2 illustrates an example of a control apparatus 200 for controlling a function of the (R)AN or the 5GC as illustrated on Fig. 1 . The control apparatus may comprise at least one random access memory (RAM) 211 a, at least on read only memory (ROM) 211 b, at least one processor 212, 213 and an input / output interface 214. The at least one processor 212, 213 may be coupled to the RAM 211 a and the ROM 211 b. The at least one processor 212, 213 may be configured to execute an appropriate software code 215. The software code 215 may for example allow to perform one or more steps to perform one or more of the present aspects. The software code 215 may be stored in the ROM 211 b. The control apparatus 200 may be interconnected with another control apparatus 200 controlling another function of the 5G (R)AN or the 5GC. In some embodiments, each function of the (R)AN or the 5GC comprises a control apparatus 200. In alternative embodiments, two or more functions of the (R)AN or the 5GC may share a control apparatus.

[0160] Fig. 3 illustrates an example of a user equipment 300, such as the terminal illustrated on Fig. 1. The UE 300 may be provided by any device capable of sending and receiving radio signals. Non-limiting examples comprise a user equipment, a mobile station (MS) or mobile device such as a mobile phone or what is known as a ’smart phone’, a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle), a personal data assistant (PDA) or a tablet provided with wireless communication capabilities, a machine-type communications (MTC) device, a Cellular Internet of things (CloT) device or any combinations of these or the like. The UE 300 may provide, for example, communication of data for carrying communications. The communications may be one or more of voice, electronic mail (email), text message, multimedia, data, machine data and so on.

[0161] The UE 300 may receive signals over an air or radio interface 307 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals. In Fig. 3 transceiver apparatus is designated schematically by block 306. The transceiver apparatus 306 may be provided for example by means of a radio part and associated antenna arrangement. The antenna arrangement may be arranged internally or externally to the mobile device.

[0162] The UE 300 may be provided with at least one processor 301 , at least one memory ROM 302a, at least one RAM 302b and other possible components 303 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices. The at least one processor 301 is coupled to the RAM 302b and the ROM 302a. The at least one processor 301 may be configured to execute an appropriate software code 308. The software code 308 may for example allow to perform one or more of the present aspects. The software code 308 may be stored in the ROM 302a.

[0163] The processor, storage and other relevant control apparatus can be provided on an appropriate circuit board and / or in chipsets. This feature is denoted by reference 304. The device may optionally have a user interface such as keypad 305, touch sensitive screen or pad, combinations thereof or the like. Optionally one or more of a display, a speaker and a microphone may be provided depending on the type of the device.

[0164] Existing standards define a channel state information (CSI) framework for performing a CSI measurement of a reference signal and reporting CSI based on the CSI measurement. Existing standards define a transmission configuration indication (TCI) framework for indicating reference signals and a quasi-colocation (QCL) type between the reference signals.

[0165] One or more aspect of this disclosure relates to enhancements to the CSI framework and the TCI framework.

[0166] One or more aspect of this disclosure relates to managing aperiodic CSI reporting in a communication system.

[0167] It will be understood that although one or more aspect are discussed in the context of a 5GS or a 6GS, one or more of these concepts may be applied to other generations of communication systems.

[0168] A UE may receive, from a BS, information comprising an indication of a set of configured TCI states. The information may be received via radio resource control (RRC) signaling.

[0169] A configured TCI state may comprise a first reference signal, a second reference signal and a QCL relationship (i.e. a certain QCL type) between the first reference signal and the second reference signal.

[0170] The first reference signal may comprise a synchronization signal block (SSB) or a channel state information reference signal (CSI RS). The second reference signal may comprise a channel state information reference signal (CSI RS).

[0171] The QCL type may comprise a QCL type A (Doppler shift, Doppler spread, average delay, delay spread), a QCL type B (Doppler shift, Doppler spread), a QCL type C (Average delay, Doppler shift) or a QCL type D (Spatial RX parameter). In this disclosure the expressions “QCL type”, “QCL relationship” and “QCL assumption” may be used interchangeably.

[0172] A configured TCI state may or may not comprise an indication of a source reference signal between the first reference signal and the second reference signal. A configured TCI state may or may not comprise an indication of a measurement reference signal between the first reference signal and the second reference signal. The measurement reference signal may be specific to a configured TCI state. That is, the measurement reference signal of a configured TCI state may be different from the measurement reference signal of another configured TCI state.

[0173] In this disclosure the expressions “measurement reference signal” and “target reference signal” may be used interchangeably.

[0174] A source reference signal and a measurement reference signal may be associated with a QCL type D.

[0175] Referring for example to Fig. 4, the configured TCI states may be identified by configured TCI state IDs (e.g. ‘TCI ID 1 ’, ‘TCI ID 2’, ... , ‘TCI ID N’).

[0176] The UE may receive, from the BS, information comprising an indication of a subset of activated TCI states amongst the set of configured TCI states. The subset of activated TCI states may comprise some or all of the set of configured TCI states. The information may receive via medium access control control element (MAC CE).

[0177] The subset of activated TCI states may comprise an activated TCI state for beam information reporting. The subset of activated TCI states may comprise an activated TCI state for aperiodic CSI reporting. The subset of activated TCI states may comprise an activated TCI state for beam information reporting and for aperiodic CSI reporting. The UE may receive, from the BS, information comprising an indication as to whether an activated TCI state of the subset of activated TCI states is for beam information reporting, for aperiodic CSI reporting or for beam information reporting and for aperiodic CSI reporting. The indication may comprise a field A set to a value (e.g., ‘A =0’ activated TCI state is for beam information reporting, ‘A=1 ’ activated TCI state is for aperiodic CSI reporting or ‘A=1 ’ activated TCI state is for beam information reporting and for aperiodic CSI reporting).

[0178] The MAC CE may be specific for the activation of configured TCI states for aperiodic CSI reporting. The MAC CE may be specific for the activation of configured TCI states for beam information reporting and for aperiodic CSI reporting. The MAC CE may comprise a specific logical channel ID. The specific logical channel ID may be different from the logical channel ID of a MAC CE for the activation of configured TCI states for beam information reporting.

[0179] The subset of activated TCI states and their activated TCI states ID may be mapped to codepoints. The mapping may be in ascending order or in listing order of the subset of activated TCI states in the MAC CE. For example, a first activated TCI state (e.g. ‘TCI ID T) may be mapped to a first code point (e.g., ‘CP-1 =00’) and a second activated TCI state (e.g., ‘TCI ID 3’) may be mapped to a second code point ‘CP-2 =01 ’).

[0180] Alternatively, the aperiodic CSI RS configuration may be mapped to a codepoint. The subset of activated TCI states and their activated TCI states ID may be mapped to codepoints. The mapping may be in ascending order or in listing order of the subset of activated TCI states in the MAC CE. For example, the aperiodic CSI RS configuration may be mapped to a first codepoint (e.g., ‘CP-1 =00’) . A first activated TCI state (e.g. ‘TCI ID T) may be mapped to a second code point (e.g., ‘CP-2 =0T) and a second activated TCI state (e.g., ‘TCI ID 3’) may be mapped to a third code point ‘CP-3 =10’). Beam information reporting may refer to a measurement report including an indication of at least one transmission (TX) beam for a beam management procedure. Each TX beam may be transmitted by a BS. Each TX beam may be associated with at least one DL reference signal. The beam information reporting may refer to reporting a TX beam and / or a measured CSI for the at least one DL reference signal associated with the TX beam. The at least one reported CSI may be the highest CSI .

[0181] In this disclosure the expressions “CSI” and “CSI quantity” may be used interchangeably.

[0182] For example, in a beam management procedure the BS may perform a TX beam sweep from a set of TX beams. Each TX beam may be associated with a respective SSB. The SSBs may be sent sequentially in a SSB burst. The UE may perform a RX beam sweep from a set of reception (RX) beams. The UE may measure a CSI for the SSB associated with each TX beam whilst using each RX beam based on an activated TCI state. The UE may select a highest quality TX beam based on the measurements. The UE may transmit a measurement report including an indication of the at least one TX beam to the BS and / or the CSI for the SSB associated with the at least one TX beam.

[0183] An activated TCI state may be for (i.e., used for or associated with) beam information reporting. The activated TCI state may comprise a DL activated TCI state or an UL and DL activated TCI states (i.e., joint activated TCI states).

[0184] An activated TCI state may also refer to an indicated TCI state (i.e., one or more of the activated TCI States may be indicated for DL reception and / or uplink transmission).

[0185] A reference signal included in an activated TCI state for beam information reporting may be used as a source reference signal (i.e., QCL source) for reception of a measurement reference signal (e.g. QCL target) of a DL channel. The DL channel may comprise a physical downlink control channel (PDCCH) and / or a physical downlink shared channel (PDSCH)). The QCL source provided by the activated TCI state may be used as QCL source for a DMRS of a DL channel (e.g. PDCCH DMRS and / or PDSCH DMRS).

[0186] In this disclosure, the expressions “QCL source” or “QCL reference” may be used interchangeably.

[0187] The UE may receive, from a BS, aperiodic CSI RS resource configuration. The aperiodic CSI RS resource configuration may be received via RRC signaling. The aperiodic CSI RS resource configuration may comprise an indication of a measurement reference signal for aperiodic CSI reporting. The aperiodic CSI RS resource configuration may comprise an indication of a measurement reference signal for aperiodic CSI reporting common for all activated TCI states for aperiodic CSI reporting.

[0188] Aperiodic CSI reporting may refer to an aperiodic measurement report including CSI. CSI may comprise one or more of a precoding matrix indicator (PMI), a channel quality indicator (CQI), a rank indicator (Rl) and / or a CSI measurement of a measurement reference signal.

[0189] A CSI measurement of a measurement reference signal may comprise one or more of a measurement of a reference signal received power (RSRP) of the measurement reference signal, a measurement of a reference signal received quality (RSRQ) of the measurement reference signal and / or a measurement of a signal to noise plus interference ratio (SNIR) of the measurement reference signal.

[0190] The UE may receive, from the BS, reporting configuration. The reporting configuration may be received via RRC. The reporting configuration may comprise information comprising an indication that aperiodic CSI reporting is based on a source reference signal and a measurement reference signal indicated in an activated TCI state for aperiodic CSI reporting or the aperiodic CSI RS resource configuration.

[0191] The UE may receive, from the BS, downlink control information (DCI). The DCI may be received via physical downlink control channel (PDCCH).

[0192] The DCI may comprise an indication as to whether at least one of an activated TCI state or the aperiodic CSI RS resource configuration is to be applied for aperiodic channel state information reporting. The DCI may comprise a codepoint associated with a TCI state ID identifying an activated TCI state or a codepoint associated with the aperiodic CSI RS resource configuration.

[0193] The association between a codepoint and an activated TCI state ID may be specific to a transmission reception point (e.g., antenna panel) used by the BS to transmit the DCI. That is, the association between a codepoint and an activated TCI state ID may be different when a first transmission reception point (e.g., first antenna panel) or a second transmission reception point (e.g., second antenna panel) is used by the BS to transmit the DCI.

[0194] The DCI may comprise an indication of a source reference signal amongst a first reference signal and a second reference signal of an activated TCI state (e.g., when an activated TCI state may not comprise an indication of a source reference signal amongst a first reference signal and a second reference signal of the activated TCI state).

[0195] The DCI may comprise an indication of a measurement reference signal amongst a first reference signal and a second reference signal of an activated TCI state (e.g., when an activated TCI state may not comprise an indication of a measurement reference signal amongst a first reference signal and a second reference signal of the activated TCI state). The measurement reference signal may be specific to an (activated) TCI state. That is, the measurement reference signal of an (activated) TCI state may be different from the measurement reference signal of another (activated) TCI state. In other words, the (activated) TCI state configuration may include a configuration of a measurement reference signal (for CSI measurements). One or more (activated) TCI states may include different configured reference signals.

[0196] The DCI may comprise an indication as to whether aperiodic CSI reporting is requested.

[0197] In an implementation, the DCI the DCI may comprise a first field F1 . The size (e.g., N bits) of the first field F1 may be configured by the BS. The first field F1 may comprise the indication as to whether at least one activated TCI state is to be applied for aperiodic channel state information reporting. The first field F1 may comprise the indication of the source reference signal amongst the first reference signal and the second reference signal of an activated TCI state. The first field F1 may comprise the indication of the measurement reference signal amongst the first reference signal and the second reference signal of an activated transmission configuration indicator state.

[0198] In another implementation, the DCI may comprise a first field F1 and a second field F2. The sizes (e.g., N bits) of the first field F1 and / or the second field F2 may be configured by the BS. The first field F1 may comprise the indication as to whether at least one activated TCI state is to be applied for aperiodic channel state information reporting. The first field F1 or the second field F2 may comprise the indication of the source reference signal amongst the first reference signal and the second reference signal of an activated TCI state. The first field F1 or the second field F2 may comprise the indication of the measurement reference signal amongst the first reference signal and the second reference signal of an activated transmission configuration indicator state. The second field F2 may comprise the indication as to whether aperiodic CSI reporting is requested. The UE may apply at least one of the activated TCI state or the aperiodic CSI RS resource configuration for aperiodic CSI reporting.

[0199] Applying the activated TCI state may comprise determining a source reference signal. The source reference signal may be used as a QCL source for a measurement reference signal. The measurement reference signal may be used as a QCL target. The source reference signal may at least one reference signal included in the activated TCI state or the aperiodic CSI RS resource configuration. The measurement reference signal may be at least one reference signal included in the activated TCI state or the aperiodic CSI RS resource configuration. Applying the activated TCI state may comprise performing a CSI measurement of the source reference signal. Applying the activated TCI state may comprise performing a CSI measurement of the measurement reference signal based on the CSI measurement of the source reference signal. Applying the activated TCI state may comprise reporting CSI, to the BS, based on the CSI measurement.

[0200] Applying the aperiodic CSI RS resource configuration may comprise determining a measurement reference signal. The measurement reference signal may be determined based on the CSI RS resource configuration. Applying the aperiodic CSI RS resource configuration may comprise applying a configured CSI RS as the measurement reference signal. Applying the aperiodic CSI RS resource configuration may comprise performing a CSI measurement of the measurement reference signal. Applying the aperiodic CSI RS resource configuration comprise reporting CSI, to the BS, based on the CSI measurement.

[0201] In a first scenario, the UE may receive, from the BS, the DCI comprising an indication of an activated TCI state to be applied for aperiodic CSI reporting. The DCI may comprise a codepoint associated with a TCI state ID identifying the activated TCI state. The UE may apply the activated TCI state for aperiodic CSI reporting. The UE may perform a CSI measurement of a measurement reference signal included in the activated TCI state (that is indicated). The UE may report the CSI measurement to the BS.

[0202] In a second possible scenario, the UE may receive, from the BS, the DCI comprising an indication of the aperiodic CSI RS resource configuration to be applied for aperiodic CSI reporting. The DCI may comprise a codepoint associated with a TCI state ID identifying the aperiodic CSI RS resource configuration. The UE may apply the aperiodic CSI RS resource configuration for aperiodic CSI reporting. The DCI may further comprise an indication of an activated TCI State to be applied for aperiodic CSI reporting. In one example, a reference signal included in the activated TCI state (that is indicated) may be used as a source reference signal (i.e., QCL source). A reference signal included in the aperiodic CSI RS resource configuration (that is indicated) may be used as a measurement reference signal (i.e., QCL target).

[0203] In an implementation of the first scenario, the UE may apply the activated TCI state for aperiodic CSI reporting as follows.

[0204] The UE may determine a source reference signal amongst a first reference signal and a second reference signal of the activated TCI state. The source reference signal may be determined based on the activated TCI state or the aperiodic CSI RS resource configuration.

[0205] The UE may determine a measurement reference signal amongst a first reference signal and a second reference signal of the activated TCI state. The measurement reference signal may be determined based on the activated TCI state or the aperiodic CSI RS resource configuration.

[0206] The UE may determine multiple antenna configurations detecting the source reference signal and the measurement reference signal. The multiple antenna configurations may comprise multiple transmission reception points (e.g., multiple antenna panels). The UE may determine that the UE is capable of performing multiple CSI measurements of the measurement reference signal based on the activated TCI state via the multiple antenna configurations.

[0207] For each antenna configuration, the UE may demodulate and decode the source reference signal. The UE may determine a channel estimation based on the source reference signal. The UE may demodulate and decode the measurement reference signal based on the channel estimation. The UE may perform a CSI measurement of the measurement reference signal.

[0208] That is, the UE may perform multiple CSI measurements of the measurement reference signal based on the activated TCI state via multiple antenna configurations. The multiple CSI measurements of the measurement reference signal may comprise multiple measurements of a RSRP of the measurement reference signal, multiple measurements of a RSRQ of the measurement reference signal and / or multiple measurements of a SNIR of the measurement reference signal.

[0209] The UE may select a CSI measurement amongst the multiple CSI measurements. The UE may select a highest measurement amongst the multiple measurements.

[0210] The UE may report, to the BS, CSI based on the selected measurement. The CSI may be reported via the antenna configuration used to perform the selected measurement.

[0211] Fig. 4 shows RRC comprising an indication of a set of configured TCI states, a MAC CE comprising an indication of a subset of activated TCI states and DCI comprising an indication as to whether an activated TCI state or aperiodic CSI RS resource configuration is to be applied for aperiodic CSI RS reporting. Fig. 5 shows a block diagram of an example of method for managing aperiodic CSI reporting in a communication system. The method may be performed by an apparatus (e.g., UE).

[0212] At step 500, the apparatus may receive, from a BS, DCI comprising an indication as to whether at least one of an activated TCI state or a resource configuration is to be applied for aperiodic CSI reporting .

[0213] At step 502, the apparatus may apply at least one of the activated TCI state or the resource configuration for aperiodic CSI reporting based on the indication.

[0214] Fig. 6 shows a block diagram of an example of method for managing aperiodic CSI reporting in a communication system in a communication system. The method may be performed by an apparatus (e.g., BS).

[0215] At step 600, the apparatus may transmit, to a UE, information comprising an indication as to whether at least one of an activated TCI state or a resource configuration is to be applied for aperiodic CSI reporting.

[0216] At step 602, the apparatus may receive, from the UE, CSI based on at least one of the activated TCI state or the resource configuration.

[0217] Fig. 7 shows a block diagram of an example of method for managing aperiodic CSI reporting in a communication system in a communication system. The method may be performed by an apparatus (e.g., UE).

[0218] At step 700, the apparatus may determine an activated TCI state to be applied for aperiodic CSI reporting.

[0219] At step 702, the apparatus may determine a measurement reference signal amongst a first reference signal and a second reference signal of the activated TCI state. At step 704, the apparatus may perform multiple measurements of the measurement reference signal based on the activated TCI state via multiple antenna configurations.

[0220] At step 706, the apparatus may select a measurement amongst the multiple measurements.

[0221] At step 708, the apparatus may report CSI based on the selected measurement.

[0222] Fig. 8 shows a schematic representation of non-volatile memory media 1000 storing instructions which when executed by a processor allow the processor to perform one or more of the steps of the methods of Fig. 5 to Fig. 7.

[0223] It is noted that while the above describes example embodiments, there are several variations and modifications which may be made to the disclosed solution without departing from the scope of the present invention.

[0224] The embodiments may thus vary within the scope of the attached claims. In general, some embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although embodiments are not limited thereto. While various embodiments may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof. The embodiments may be implemented by computer software stored in a memory and executable by at least one data processor of the involved entities or by hardware, or by a combination of software and hardware. Further in this regard it should be noted that any procedures, e.g., as in Fig. 5 to Fig. 7, may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions. The software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.

[0225] The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory. The data processors may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), gate level circuits and processors based on multi-core processor architecture, as non-limiting examples.

[0226] Alternatively or additionally some embodiments may be implemented using circuitry. The circuitry may be configured to perform one or more of the functions and / or method steps previously described. That circuitry may be provided in the base station and / or in the communications device.

[0227] As used in this application, the term “circuitry” may refer to one or more or all of the following:

[0228] (a) hardware-only circuit implementations (such as implementations in only analogue and / or digital circuitry);

[0229] (b) combinations of hardware circuits and software, such as: (i) a combination of analogue and / or digital hardware circuit(s) with software / firmware and

[0230] (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 communications device or base station to perform the various functions previously described; and

[0231] (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.

[0232] 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 integrated device.

[0233] The term “means” as used in the description and in the claims may refer to one or more individual elements configured to perform the corresponding recited functionality or functionalities, or it may refer to several elements that perform such functionality or functionalities. Furthermore, several functionalities recited in the claims may be performed by the same individual means or the same combination of means. For example, performing such functionality or functionalities may be caused in an apparatus by a processor that executes instructions stored in a memory of the apparatus.

[0234] The foregoing description has provided by way of exemplary and non-limiting examples a full and informative description of some embodiments. However, various modifications and adaptations may become apparent to those skilled in the relevant arts in view of the foregoing description, when read in conjunction with the accompanying drawings and the appended claims. However, all such and similar modifications of the teachings will still fall within the scope as defined in the appended claims.

Claims

1. CLAIMS1 . An apparatus comprising: means for determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; means for determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; means for performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; means for selecting a measurement amongst the multiple measurements; and means for reporting channel state information based on the selected measurement.

2. The apparatus of claim 1 , wherein the multiple antenna configuration comprises multiple antenna panels.

3. The apparatus of claim 1 or claim 2, wherein the means for selecting a measurement amongst the multiple measurements comprises: means for selecting a highest measurement amongst the multiple measurements.

4. The apparatus of any of claims 1 to 3, wherein the multiple measurements of the measurement reference signal comprise: multiple measurements of a reference signal received power of the measurement reference signal; multiple measurements of a reference signal received quality of the measurement reference signal; ormultiple measurements of a signal to noise plus interference ratio of the measurement reference signal.

5. The apparatus of any of claims 1 to 4, wherein the means for determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting comprises: means for receiving downlink control information comprising an indication of the activated transmission configuration indicator state.

6. The apparatus of claim 5, wherein the downlink control information indicates a codepoint associated to an activated transmission configuration indicator state identifier identifying the activated transmission configuration indicator state.

7. The apparatus of any of claims 1 to 6, wherein the activated transmission configuration indicator state comprises: a first reference signal; a second reference signal; and a quasi-colocation type between the first reference signal and the second reference signal.

8. The apparatus of claim 7, wherein the first reference signal comprises a synchronisation signal block or a channel state information reference signal.

9. The apparatus of claim 8, wherein the second reference signal comprises a channel state information reference signal.

10. The apparatus of any of claims 7 to 9, wherein the activated transmission configuration indicator state indicates at least one of: a source reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state; ora measurement reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state.11 . The apparatus of any of claims 1 to 10, comprising: means for receiving downlink control information comprising an indication of at least one of: a source reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state; or a measurement reference signal amongst the first reference signal and the second reference signal of the activated transmission configuration indicator state.

12. The apparatus of any of claims 7 to 11 , wherein the activated transmission configuration indicator state indicates a quasi-colocation type D between the first reference signal and the second reference signal.

13. The apparatus of any of claims 1 to 12, wherein the channel state information comprises at least one of: a precoding matrix indicator; a channel quality indicator; a rank indicator; or the selected measurement.

14. The apparatus of any of claims 1 to 13, comprising: means for selecting the multiple antenna configurations detecting the measurement reference signal.

15. The apparatus of any of claims 1 to 14, wherein the means for reporting channel state information based on the measurement comprises: means for reporting channel state information based on the measurement via the antenna configuration used to perform the selected measurement.

16. A method comprising: determining an activated transmission configuration indicator state to be applied for aperiodic channel state information reporting; determining a measurement reference signal amongst a first reference signal and a second reference signal of the activated transmission configuration indicator state; performing multiple measurements of the measurement reference signal based on the activated transmission configuration indicator state via multiple antenna configurations; selecting a measurement amongst the multiple measurements; and reporting channel state information based on the selected measurement.

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