Management of time misalignment reporting

Abstract

A method, system and apparatus are disclosed According to some embodiments, a user equipment, UE, is provided. The UE is configured to receive a configuration for quantizing a time misalignment between a first reference signal, RS, and a second RS, where the first RS is associated with a first resource set, and the second RS is associated with a second resource set that is different from the first resource set. The UE is configured to quantize a time misalignment between the first RS and the second RS according to the configuration for quantizing, and transmit an indication of the quantized time misalignment.

Description

[0001]MANAGEMENT OF TIME MISALIGNMENT REPORTING TECHNICAL FIELD The present disclosure relates to wireless communications, and in particular, to time misalignment reporting associated with various Transmission Reception Points (TRPs). BACKGROUND The Third Generation Partnership Project (3GPP) has developed and is developing standards for Fourth Generation (4G) (also referred to as Long Term Evolution (LTE)) and Fifth Generation (5G) (also referred to as New Radio (NR)) wireless communication systems. Such systems provide, among other features, broadband communication between network nodes, such as base stations, and mobile user equipments (UE), as well as communication between network nodes and between WDs. The 3GPP is also developing standards for Sixth Generation (6G) wireless communication networks. The next generation mobile wireless communication system (5G) or new radio (NR), will support a diverse set of use cases and a diverse set of deployment scenarios. The later includes deployment at both low frequencies (100s of MHz), similar to existing LTE, and very high frequencies (mm waves in the tens of GHz). Similar to LTE, NR will use OFDM (Orthogonal Frequency Division Multiplexing) in the downlink (DL) (i.e., from a network node (e.g., gNB, eNB, or base station) to a user equipment or UE). In the uplink (UL) (i.e., from UE to network node), both OFDM and DFT-spread OFDM (DFT-S-OFDM), also known as SC-FDMA in LTE, will be supported. The basic NR physical resource can thus be seen as a time-frequency grid as illustrated in FIG.1, where a resource block (RB) in a 14-symbol slot is shown. A resource block corresponds to 12 contiguous subcarriers in the frequency domain. Resource blocks are numbered in the frequency domain, starting with 0 from one end of the system bandwidth. Each resource element corresponds to one OFDM subcarrier duringone OFDM symbol interval.Different subcarrier spacing values are supported in NR. The supported subcarrierspacing values (also referred to as different numerologies) are given by ∆^ =(15 × 2^) ^^^ where ^ is a non-negative integer and can be one of {0,1,2,3,4}. ∆^ =15^^^ (e.g., ^ = 0) is the basic (or reference) subcarrier spacing that is also used in LTE.^ is also referred to as the numerology. In the time domain, DL and UL transmissions in NR may be organized into equally-sized subframes of 1ms each similar to LTE. A subframe is further divided into multiple slots of equal duration. The slot length is dependent on the subcarrier spacing or ^ numerology and is given by ms. Each slot consists of 14 OFDM symbols for normal Cyclic Prefix (CP). The data scheduling in NR can be on a slot basis. An example is shown in FIG.2 with a 14-symbol slot, where the first two symbols contain control channel (e.g., physical downlink control channel (PDCCH)) and the rest contains data channel (e.g., physical downlink shared channel (PDSCH)). For convenience, subframe is referred throughout below. DL transmissions can be dynamically scheduled, i.e., in each slot the gNB transmits downlink control information (DCI) about which UE data is to be transmitted to and which resource blocks in the current DL slot the data is transmitted on. This control signaling is typically transmitted in the first one or two OFDM symbols in each slot in NR. The control information is carried on Physical Control Channel (e.g., PDCCH) and data is carried on PDSCH. A UE first detects and decodes PDCCH and, if a PDCCH is decoded successfully, the UE then decodes the corresponding PDSCH based on the decoded control information in the PDCCH. UL data transmission can also be dynamically scheduled using PDCCH. Similar to downlink, a UE first decodes uplink grants in PDCCH and then transmits data over the Physical Uplink Shared Channel (PUSCH) based the decoded control information in the uplink grant such as modulation order, coding rate, uplink resource allocation, and etc. Tracking Reference Signal (TRS) Similar to LTE, Channel State Information Reference Signal (CSI-RS) was introduced in NR for channel measurement in the DL. A CSI-RS is transmitted over an antenna port (either a physical or virtual antenna) on certain REs for a UE to measure the DL channel associated with the antenna port. CSI-RS for this purpose is also referred to as Non-Zero Power (NZP) CSI-RS. The supported number of antenna ports or CSI-RS ports in NR are {1, 2, 4, 8, 12, 16, 24, 32}. A Tracking Reference Signal (TRS) is a special NZP CSI-RS with one port and is used for time and frequency tracking in the DL. FIG.3 shows an example of a TRS resource configuration in a PRB and 2 slots. A UE can be configured with one or more periodic TRSs, or one or more periodic TRSs and aperiodic TRSs in NR. For a periodic TRS, it has a periodicity and a slot offset. The periodicity can one of 2^^^slots where ^^=10, 20, 40, or 80. A TRS occupies multiple RBs. When a NZP CSI-RS resource setcontains “trs- info”, then the NZP CSI-RS resource set is for TRS.Quasi Co-location Demodulation reference signals (DM-RS) are used for coherent demodulation of PDSCH. A PDSCH can be associated with one or multiple DMRS antenna ports or simply DMRS ports, each associated with a spatial layer or a multi-input-multiple-output (MIMO) layer. Multiple layers can be multiplexed in a same time and frequency resource, where different data are carried in different layers. The DMRS ports used for a PDSCH transmission are indicated in DCI scheduling the PDSCH. Several signals can be transmitted from different antenna ports. These signals can have the same large-scale properties, for instance in terms of Doppler shift / spread, average delay spread, or average delay, when measured at a UE receiver. These antenna ports are then referred to as quasi co-located (QCL). If the UE knows that two antenna ports, a first and second antenna ports, are QCL with respect to a certain channel property (e.g., Doppler spread), the UE can obtain the channel property of the first antenna port (e.g., DM-RS) from the second antenna port (e.g., TRS). The reference signal (e.g., TRS) associated with the second antenna port is known as the QCL source RS and the referencesignal (e.g., DM-RS) associated with the first antenna port is known as the QCL target RS.The supported QCL types in NR are: ^'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}^ 'QCL-TypeB': {Doppler shift, Doppler spread}^ 'QCL-TypeC': {Doppler shift, average delay}^ 'QCL-TypeD': {Spatial Rx parameter}QCL relations are specified by TCI states. A TCI state contains one or two source RS and the associated QCL types. In case two QCL types are configured, one is QCL type-D. A UE can be configured by RRC signalling with a list of TCI states. For PDSCH, one or two TCI states from the list can be activated for each of up to 8 TCI codepoints by a MAC CE command. Up to 8 TCI states can be activated. One of the TCI codepoints is indicated in DCI scheduling a PDSCH. UE performs PDSCH reception according to the TCI state(s) indicated in the TCI codepoint. Table 1 is a summary of possible source RS and target RS in NR. SSB refers tosynchronization signal and broadcast channel, CSI-RS (BM) refers to CSI-RS for beam management in FR2. Table 1: Target and source RS supported in NR.Target RS QCL source RSQCL type A QCL type B QCL type C QCL type DCSI-RS (CSI) TRS TRSTRS SSBTRS CSI-RS (BM)TRS DMRS for PDSCH TRS TRSTRS CSI-RS (BM)CSI-RS for CQI CSI-RS for CSICSI framework in NR In NR, a UE can be configured with one or multiple Channel State Information (CSI) report configurations for DL CSI feedback by the UE. A CSI report may contain one or more of: ^Channel rank indicator (RI)^ Antenna precoding matrix indicator (PMI)^ Channel quality indicator (CQI)^ DL reference signal received power (RSRP) or signal to interference and noiseratio (SINR) ^CSI reference signal (CSI-RS) resource indicator (CRI)Each CSI report configuration is associated with a BWP and contains all necessary information required for a CSI report, including: ^a CSI resource configuration for channel measurement^ reporting type, i.e., aperiodic CSI (on PUSCH), periodic CSI (on PUCCH) orsemi-persistent CSI (on PUCCH, and DCI activated on PUSCH). ^report quantity specifying what to be reported, such as RI, PMI, CQI, RSRP, etc.A UE can be configured with one or multiple CSI resource configurations for channel measurement. Each CSI resource configuration for channel measurement can contain one or more NZP CSI-RS resource sets. For each NZP CSI-RS resource set, it can further contain one or more NZP CSI-RS resources. A NZP CSI-RS resource can be periodic, semi-persistent, or aperiodic. Periodic CSI starts after it has been configured by RRC and is reported on PUCCH, the associated NZP CSI-RS resource(s) are also periodic. For aperiodic CSI, it is reported on PUSCH and is activated by a CSI request bit field in DCI. The associated NZP CSI-RS resource(s) can be either periodic, semi- persistent, or aperiodic. The linkage between a code point of the CSI request field and aCSI report configuration is via an aperiodic CSI trigger state. A UE is configured by ahigher layer with a list of aperiodic CSI trigger states, where each of the trigger states contains an associated CSI report configuration. The CSI request field is used to indicate one of the aperiodic CSI trigger states and thus, one CSI report configuration. If there is more than one NZP CSI-RS resource set and / or more than one CSI-IM resource set associated with a CSI report configuration, only one NZP CSI-RS resource set is selected in the aperiodic CSI trigger state. Thus, each aperiodic CSI report is based on a single NZP CSI-RS resource set. CQI and PMI can be reported per subband or wideband. In case of wideband CQI or PMI, the CQI or PMI is for the whole bandwidth configured for CSI report. In case of subband QCI or PMI, the CQI or PMI is reported for each subband. The subband size inNR can be from 4 RBs to 32 RBs, depending on the size of the BWP as shown in Table 2below. Table 2: Configurable subband sizes Bandwidth part (PRBs) Subband size (PRBs)24 – 72 4, 873 – 144 8, 16145 – 275 16, 32PDSCH transmission from Multiple TRPs In NR Rel-16, non-coherent joint PDSCH transmission from two transmission and reception points (TRPs) was introduced in which a subset of MIMO layers of a PDCCH to a UE are transmitted from a first TRP and the rest of layers of the PDSCH are transmitted from a second TRP in the same time and frequency resource. Different layers are separated and received at the UE with MIMO capable receiver. An example is shown in FIG.4, where a PDSCH with two layers are scheduled with the first layer transmitted from TRP1 and the second layer from TRP2. This is signaled in the corresponding DCI by indicating a TCI codepoint associated with two TCI states, a first and second TCI states, and DMRS ports x and y in two CDM groups, where DMRS port x in the first CDM group is associated with the first TCI state and DMRS port y in the second CDM group is associated with the second TCI state. The first TCI state may contain TRS1 as the QCL source RS and the second TCI state may contain TRS1 as the QCL source RS. Coherent Joint transmission of PDSCH over Multiple TRPs In 3GPP NR Rel-18, coherent joint downlink transmission (CJT) from multiple TRPs is supported by extending the Rel-16 enhanced type II codebook and 3GPP Rel-17 further enhanced type II port selection codebook across multiple TRPs. The 3GPP Rel-16 enhanced type II codebook is specified in clause 5.2.2.2.5 of 3GPP TS 38.214 V18.0.0, and the enhanced type II codebook for CJT is specified in clause 5.2.2.2.8 of 3GPP TS 38.214 V18.0.0. The Rel-17 enhanced type II port selection codebook is specified in clause 5.2.2.2.7 of 3GPP TS 38.214 V18.0.0, and the enhanced type II port selection codebook for CJT is specified in clause 5.2.2.2.9 of 3GPP TS 38.214 V18.0.0. In CJT, all layers are transmitted from the multiple TRPs used for CJT. An example with two layers and two TRPs is shown in FIG.5, where data symbols of the two layers are transmitted from two TRPs by applying two different precoding matrices at TRP1 and TRP2. The two precoders are designed such that for each layer, the signals received from the two TRPs are phase aligned at the UE and thus, are coherently combined. There are a number of challenges in supporting CJT. Firstly, propagation delays between different TRPs and a UE can be quite different. These large delay differences would result in a large frequency selective composite channel, i.e., the channel amplitude and phase vary rapidly across frequency. In existing NR CSI feedback, a precodingmatrix per subband is reported. The subband size can vary between 2 RBs to 32 RBs asspecified in 3GPP, e.g., 3GPP TS 38.214. FIG. 6 shows an example of phase variationwithin a subband for different subband sizes with one microsecond (1us) delay differencebetween two TRPs. Even with 2 RB subband size, the phase variation exceeds 130degrees. For constructive combining of two signals, their phase difference should be less than 90 degrees. Therefore, with current subband size and per subband CSI feedback,signals from multiple TRPs cannot be coherently combined with even 1 us delaydifference. Secondly, even though a same nominal transmit frequency may be used at multiple TRPs, due to local oscillator stability, there will be some actual transmit frequency difference between the multiple TRPs. In 3GPP RAN4, the maximum transmit frequencyerror for a base station is specified in 3GPP TS 38.104 and is discussed below. For the most stringent + / -0.05ppm requirement, there will be some residual frequency errors.These frequency errors mean that the phase of a signal will change over time.FIG. 7 is a chart showing 3GPP minimum requirement on transmit frequency erroraccording to, for example, 3GPP TS 38.104. Delay difference and frequency difference pre-compensation for CJT over Multiple TRPs FIG. 8 shows an example of transmission of a signal ^(^) from two TRPs. ^(^) ismultiplied by two co-phasing / pre-compensation coefficients ^^and ^^at the two TRPs before being transmitted to the UE. The effective propagation channels from the two TRPs to the UE, including transmitter and receiver circuitries and antenna patterns associated with the two TRPs, are denoted by ℎ and ℎ^, respectively. and ^^are thefrequencies and and ^^ are the random initial phases at the two TRPs. ^ is thepropagation delay (including possible timing offsets) difference between the two TRPs. The composite signal at the UE can be expressed as For narrow-band signal and when the delay ^ is small, the signal envelope doesn’tchange much, i.e., ^(^ − ^) ≈ ^(^). Thus, (eq. 1) can be revised as (eq.3) To coherently combine the signals from the two TRPs, the following co- phasing / pre-compensation coefficients may be used ^^ = ^^^(∠^^^^^) (eq.4a) (eq.4b) where ∠(^) denotes the angle of a complex variable ^. The resulted compositesignal, when the above co-phasing / pre-compensation coefficients in eq. 4a-4b are applied,is then (eq.5) Alternatively, the co-phasing / pre-compensation coefficients can be as follows The resulted composite signal, when the above co-phasing / pre-compensation coefficients in eq.6a-6b are applied, is then (eq.7) Note that the above applies also in cases where multiple antenna ports are deployedin each of the TRPs. In that case, additional precoding or beamforming is applied to ^(^),where ^(^) is data associated with a MIMO layer of PDSCH or DMRS.For a given MIMO layer, the signal received from TRP1 would become channel matrix, ^^is a ^^by 1 precoding vector associated with the corresponding MIMO layer, is the number of antenna ports deployed at TRPs and M is the number of receive antennas at the UE. Similarly, for the given MIMO layer, the signal received from TRP2 would become ^^^^^^^(^)^^(^^^^(^^^)^^^), where ^^is a ^^by M channel matrix, ^^is a ^^by 1 precoding vector associated with the corresponding MIMO layer, ^^is the number of antenna ports deployed at TRP2. CJT from multiple TRPs is possible for the case of multiple PDSCH layers. For RPDSCH layers, each TRP will use a corresponding N1 x R precoding matrix wherein eachcolumn in the precoding matrix corresponds to one of the R MIMO layers. In the case ofR PDSCH layers, the transmitted data ^(^) will consist of R different symbols (i.e., onesymbol corresponding to each of the R PDSCH layers).For CJT, it is envisioned that precoding matrices / vectors and the co-phasing / pre- compensation coefficients {^^,^^} are reported by the UE to the network. SUMMARY Some embodiments advantageously provide methods, systems, and apparatuses for time misalignment reporting associated with various Transmission Reception Points (TRPs). In order to derive the co-phasing / pre-compensation coefficients ^^and ^^, one or more of the following may need to be reported from the UE to the network, e.g., to the network node: ^transmit frequency associated with a TRP,^ transmit frequency difference between two TRPs,^ delay associated with a TRP,^ delay difference between two TRPs.One or more embodiments relate to methods for configuration of quantization methods that are used by the UE for efficiently quantizing the time misalignment betweenmultiple TRPs. Given a various configuration parameters, the UE and network / networknode obtain a common understanding on how to report the quantized time misalignment. According to one aspect of the present disclosure, a method implemented by a userequipment, UE, that is configured to communicate with a network node is provided. Aconfiguration for quantizing a time misalignment between a first reference signal, RS, andand a second RS is received where the first RS is associated with a first resource set andthe second RS is associated with a second resource set that is different from the firstresource set. A time misalignment between the first RS and and the second RS isquantized according to the configuration for quantizing. An indication of the quantizedtime misalignment is transmitted.According to one or more embodiments of this aspect, the configuration comprises one or both of: a first reference value that is a function a time duration of a cycle prefix, Tcp; and a second value that indicates a number of bits for quantizing the time misalignment among multiple transmission reception points, TRPs. According to one or more embodiments of this aspect, the time duration of the cycle prefix corresponds to one of: .5Tcp, Tcp and 2Tcp. According to one or more embodiments of this aspect, the indication of thequantized time misalignment comprises a binary codepoint that is used to indicate that atime misalignment exceeds a measurement range.According to one or more embodiments of this aspect, the quantizing of the time misalignment is associated with coherent joint transmission, CJT, comprising: a first transmission reception point, TRP, associated with the first resource set; and a second TRP associated with the second resource set. According to one or more embodiments of this aspect, the configuration is received via radio resource control, RRC, signaling; and the configuration comprising at least one RRC parameter that is based on one or more of: numerology; subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement. According to one or more embodiments of this aspect, a report of UE capabilities is transmitted, where the report of the UE capabilities comprises whether the UE supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting, andwhere the configuration is based on at least on the UE capabilities.According to another aspect of the present disclosure, a user equipment, UE,configured to communicate with a network node is provided. The UE is configured to:receive a configuration for quantizing a time misalignment between a first referencesignal, RS, and and a second RS where the first RS is associated with a first resource setthe second RS is associated with a second resource set that is different from the firstresource set, quantize a time misalignment between the first RS and and the second RSaccording to the configuration for quantizing; and transmit an indication of the quantizedtime misalignment. According to one or more embodiments of this aspect, the configuration comprises one or both of: a first reference value that is a function a time duration of a cycle prefix, Tcp; and a second value that indicates a number of bits for quantizing the time misalignment among multiple transmission reception points, TRPs. According to one or more embodiments of this aspect, the time duration of the cycle prefix corresponds to one of: .5Tcp, Tcp and 2Tcp. According to one or more embodiments of this aspect, the indication of thequantized time misalignment comprises a binary codepoint that is used to indicate that atime misalignment exceeds a measurement range.According to one or more embodiments of this aspect, the quantizing of the time misalignment is associated with coherent joint transmission, CJT, comprising: a first transmission reception point, TRP, associated with the first resource set; and a second TRP associated with the second resource set. According to one or more embodiments of this aspect, the configuration is received via radio resource control, RRC, signaling; and the configuration comprising at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement. According to one or more embodiments of this aspect, the UE is further configuredto transmit a report of UE capabilities, where the report of the UE capabilities compriseswhether the UE supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting; and the configuration being based on at least on the UE capabilities. According to another aspect of the present disclosure, a method implemented by anetwork node that is configured to communicate with a user equipment, UE is provided. Aconfiguration for quantizing a time misalignment between a first reference signal, RS, andand a second RS is transmitted where the first RS is associated with a first resource set andthe second RS is associated with a second resource set that is different from the firstresource set. An indication of a quantized time misalignment is received from the UEwhere the quantized time misalignment is based on the configuration. At least one action is performed based on the indication. According to one or more embodiments of this aspect, the configuration comprises one or both of: a first reference value that is a function a time duration of a cycle prefix, Tcp; and a second value that indicates a number of bits for quantizing the time misalignment among multiple transmission reception points, TRPs. According to one or more embodiments of this aspect, the time duration of the cycle prefix corresponds to one of: .5Tcp, Tcp and 2Tcp. According to one or more embodiments of this aspect, the indication of thequantized time misalignment comprises a binary codepoint that is used to indicate that atime misalignment exceeds a measurement range.According to one or more embodiments of this aspect, the quantizing of the time misalignment is associated with coherent joint transmission, CJT, comprising: a first transmission reception point, TRP, associated with the first resource set; and a second TRP associated with the second resource set. According to one or more embodiments of this aspect, the configuration is transmitted via radio resource control, RRC, signaling; and the configuration comprising at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement. According to one or more embodiments of this aspect, a report of UE capabilitiesis received where the report of the UE capabilities comprises whether the UE supports aconfiguration of pre-compensated coherent joint transmission, CJT, CSI reporting; and where the configuration is based on at least on the UE capabilities. According to another aspect of the present disclosure, a network node is configuredto communicate with a user equipment, UE. The network node is configured to: transmit a configuration for quantizing a time misalignment between a first reference signal, RS, andand a second RS where the first RS is associated with a first resource set and the secondRS is associated with a second resource set that is different from the first resource set; receive, from the UE, an indication of a quantized time misalignment, the quantized timemisalignment being based on the configuration; and perform at least one action based onthe indication. According to one or more embodiments of this aspect, the configuration comprises one or both of: a first reference value that is a function a time duration of a cycle prefix, Tcp; and a second value that indicates a number of bits for quantizing the time misalignment among multiple transmission reception points, TRPs. According to one or more embodiments of this aspect, the time duration of the cycle prefix corresponds to one of: .5Tcp, Tcpand 2Tcp. According to one or more embodiments of this aspect, the indication of thequantized time misalignment comprises a binary codepoint that is used to indicate that atime misalignment exceeds a measurement range.According to one or more embodiments of this aspect, the quantizing of the time misalignment is associated with coherent joint transmission, CJT, comprising: a first transmission reception point, TRP, associated with the first resource set; and a second TRP associated with the second resource set. According to one or more embodiments of this aspect, the configuration is transmitted via radio resource control, RRC, signaling, and where the configuration comprises at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement. According to one or more embodiments of this aspect, the network node is furtherconfigured to receive a report of UE capabilities, where the report of the UE capabilitiescomprises whether the UE supports a configuration of pre-compensated coherent jointtransmission, CJT, CSI reporting, and where the configuration is based on at least on theUE capabilities. BRIEF DESCRIPTION OF THE DRAWINGS A more complete understanding of the present embodiments, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein: FIG.1 is diagram of example NR physical resources; FIG.2 is a diagram of an example NR time-domain structure with 15kHz subcarrier spacing; FIG.3 is a diagram of an example RE allocation for a TRS in NR; FIG.4 is a diagram of an example PDCCH repetition from multiple TRPs; FIG.5 is a diagram of an example CJT over two TRPs; FIG.6 is a table of an example of phase variation over a subband for a 1us delay difference; FIG.7 is a table of an example of 3GPP minimum requirement on transmit frequency error; FIG.8 is a diagram of an example of CJT from two TRPs; FIG. 9 is a schematic diagram of an exemplary network architecture according tothe principles in the present disclosure; FIG. 10 is a block diagram of a network node in communication with a userequipment over an at least partially wireless connection according to some embodimentsof the present disclosure; FIG. 11 is a diagram of an example O-RAN implementation according to someembodiments of the present disclosure; FIG. 12 is a flowchart of an example process in a network node according to someembodiments of the present disclosure; FIG. 13 is a flowchart of another example process in a network node according tosome embodiments of the present disclosure; FIG. 14 is a flowchart of an example process in a user equipment according tosome embodiments of the present disclosure; FIG. 15 is a flowchart of another example process in a user equipment according tosome embodiments of the present disclosure;FIG. 16 is a flowchart of an example for reporting time misalignment betweenmultiple TRPs; and FIG. 17 is a table of an example of phase change within a PMI subband due todifferent delay differences. DETAILED DESCRIPTION In one example system, the reporting of delay(s) / delay difference(s) and / or transmit frequency(ies) / transmit frequency difference(s) from the UE to the network is proposed. With such reporting, the network can pre-compensate for the delay difference(s) and / or frequency difference(s) between the TRPs such that coherent combining (i.e., as shown in eq.7) is achieved. That is, in the example system, high level principles on how to configure UE to report time misalignment have been proposed. However, details on how to make the configuration less complex such as to allow the UE to efficiently quantize the time misalignment is an open problem. Before describing in detail exemplary embodiments, it is noted that the embodiments reside primarily in combinations of apparatus components and processing steps related to time misalignment reporting associated with various Transmission Reception Points (TRPs). Accordingly, components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein. Like numbers refer to like elements throughout the description. As used herein, relational terms, such as “first” and “second,” “top” and “bottom,” and the like, may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the concepts described herein. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises,” “comprising,” “includes” and / or “including” when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. In embodiments described herein, the joining term, “in communication with” and the like, may be used to indicate electrical or data communication, which may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example. One having ordinary skill in the art will appreciate that multiple components may interoperate and modifications and variations are possible of achieving the electrical and data communication. In some embodiments described herein, the term “coupled,” “connected,” and the like, may be used herein to indicate a connection, although not necessarily directly, and may include wired and / or wireless connections. The term “network node” used herein can be any kind of network node comprised in a radio network which may further comprise any of base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), g Node B (gNB), evolved Node B (eNB or eNodeB), Node B, multi- standard radio (MSR) radio node such as MSR BS, multi-cell / multicast coordination entity (MCE), integrated access and backhaul (IAB) node, relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), a core network node (e.g., mobile management entity (MME), self-organizing network (SON) node, a coordinating node, positioning node, MDT node, etc.), an external node (e.g., 3rd party node, a node external to the current network), nodes in distributed antenna system (DAS), a spectrum access system (SAS) node, an element management system (EMS), etc. The network node may also comprise test equipment. The term “radio node” used herein may be used to also denote auser equipment (UE) such as a wireless device (WD) or a radio network node.In some embodiments, the non-limiting terms wireless device (WD) or a user equipment (UE) are used interchangeably. The UE herein can be any type of wireless device capable of communicating with a network node or another UE over radio signals, such as a wireless device (WD). The UE may also be a radio communication device, target device, device to device (D2D) UE, machine type UE or UE capable of machine to machine communication (M2M), low-cost and / or low-complexity UE, a sensor equipped with UE, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premises Equipment (CPE), anInternet of Things (IoT) device, or a Narrowband IoT (NB-IOT) device, etc. Also, in some embodiments the generic term “radio network node” is used. It can be any kind of a radio network node which may comprise any of base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, Multi-cell / multicast Coordination Entity (MCE), IAB node, relay node, access point, radio access point, Remote Radio Unit (RRU) Remote Radio Head (RRH). Note that although terminology from one particular wireless system, such as, for example, 3GPP LTE and / or New Radio (NR), may be used in this disclosure, this should not be seen as limiting the scope of the disclosure to only the aforementioned system. Other wireless systems, including without limitation Wide Band Code Division Multiple Access (WCDMA), Worldwide Interoperability for Microwave Access (WiMax), Ultra Mobile Broadband (UMB) and Global System for Mobile Communications (GSM), may also benefit from exploiting the ideas covered within this disclosure. Although the term TRP is used in this disclosure, the term TRP may not be captured in 3GPP specifications. Instead, a TRP can be represented by any one of ‘NZP CSI-RS resource set’, ‘NZP CSI-RS resource’, ‘TRS resource set’, and / or ‘TRS resource’, or in general downlink reference signal (DL-RS). A TRP is a transmission / reception point that can be used to transmit DL channels / signals and / or receive UL channels / signals. A serving cell of a network node (e.g., gNB) can schedule a UE from multiple TRPs for PDSCH, PDCCH, PUSCH, and PUCCH. The NW node may transmit DL reference signals from one or more TRPs and receive UL reference signals transmitted by a UE using one or more TRPs. How a NW node can operate multiple TRPs is specified in 3GPP, e.g., Clause 6.123GPP TS 38.300 V18.0.0. The terminologies ‘delay(s)’, ‘propagation delay(s)’ may be used interchangeably in the disclosure. The terminologies ‘delay difference’ and ‘time misalignment’ may be used interchangeably in this disclosure. For instance, the term ‘time misalignment’ between two TRPs, in the context of this disclosure, refers to the ‘delay difference’ between the two TRPs. The terminologies ‘NZP CSI-RS’, ‘CSI-RS’ or DL-RS may be used interchangeably in the disclosure. In 6G, other terms than NZP CSI-RS might be used. For example, a new downlink reference signal or downlink synchronization signal might be introduced in 6G which then can be used instead of NZP CSI-RS. The 6G downlink reference signals and / or downlink synchronization signals might be aperiodically, semi-persistently or periodically transmitted. Although the embodiments below are written with respect to NZP CSI-RS resource sets, the below embodiments are non-limiting and are equally applicable when NZP CSI-RS resource sets are replaced by NZP CSI-RS resource(s), TRS(s), TRSresource set(s), and / or DL-RS(s).In 3GPP 6G networks, CSI reports might be transmitted in MAC messages, whichmeans that the CSI report can be included in a single message and where the message can vary in size. Note further, that functions described herein as being performed by a userequipment or a network node may be distributed over a plurality of user equipmentsand / or network nodes. In other words, it is contemplated that the functions of the networknode and user equipment described herein are not limited to performance by a singlephysical device and, in fact, can be distributed among several physical devices. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Some embodiments provide time misalignment reporting associated with various TRPs. Referring again to the drawing figures, in which like elements are referred to bylike reference numerals, there is shown in FIG. 9 a schematic diagram of a communicationsystem 10, according to an embodiment, such as a 3GPP-type cellular network that may support standards such as LTE and / or NR (5G), which comprises an access network 12, such as a radio access network, and a core network 14. The access network 12 comprises a plurality of network nodes 16a, 16b, 16c (referred to collectively as network nodes 16), such as NBs, eNBs, gNBs or other types of wireless access points, each defining a corresponding coverage area 18a, 18b, 18c (referred to collectively as coverage areas 18). Each network node 16a, 16b, 16c is connectable to the core network 14 over a wired or wireless connection 20. Access network 12 may include one or more Transmission Reception Points 17a-b (TRPs 17a-b) (collectively referred to as TRP 17) that are in communication with network node 16 and / or UE 12. In one or more embodiments, TRP 17 may be separate from network node 16 or part of network node 16, include hardware and / or software similar to network node 16 as described below. A first user equipment (UE) 22a located in coverage area 18a is configured to wirelessly connect to, or be paged by, the corresponding network node 16a. A second UE 22b in coverage area 18b is wirelessly connectable to the corresponding network node 16b. While a plurality of UEs 22a, 22b (collectively referred to as user equipments 22) are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole UE is in the coverage area or where a sole UE is connecting to the corresponding network node 16. Note that although only two UEs 22 and three network nodes 16 are shown for convenience, the communication system may include many more UEs 22 and network nodes 16. Also, it is contemplated that a UE 22 can be in simultaneous communication and / or configured to separately communicate with more than one network node 16 and more than one type of network node 16. For example, a UE 22 can have dual connectivity with a network node 16 that supports LTE and the same or a differentnetwork node 16 that supports NR. As an example, UE 22 can be in communication withan eNB for LTE / E-UTRAN and a gNB for NR / NG-RAN. The intermediate network 30 may be one of, or a combination of more than one of, a public, private or hosted network. The intermediate network 30, if any, may be a backbone network or the Internet. In some embodiments, the intermediate network 30 may comprise two or more sub-networks (not shown). Anetwork node 16 is configured to include a configuration unit 32 which isconfigured to perform one or more network node 16 functions described herein such as those functions related to time misalignment reporting associated with various TRPs. Example implementations, in accordance with an embodiment, of the UE 22 andnetwork node 16 discussed in the preceding paragraphs will now be described with reference to FIG.10. The communication system 10 further includes a network node 16 provided in a communication system 10 and including hardware 58 enabling it tocommunicate with the UE 22 and other entities in communication system 10. Thehardware 58 may include a communication interface 60 for setting up and maintaining a wired or wireless connection with an interface of a different communication device of the communication system 10, as well as a radio interface 62 for setting up and maintaining at least a wireless connection 64 with a UE 22 located in a coverage area 18 served by the network node 16. The radio interface 62 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and / or one or more RF transceivers. In the embodiment shown, the hardware 58 of the network node 16 further includes processing circuitry 68. The processing circuitry 68 may include a processor 70 and a memory 72. In particular, in addition to or instead of a processor, such as a central processing unit, and memory, the processing circuitry 68 may comprise integrated circuitry for processing and / or control, e.g., one or more processors and / or processor cores and / or FPGAs (Field Programmable Gate Array) and / or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions. The processor 70 may be configured to access (e.g., write to and / or read from) the memory 72, which may comprise any kind of volatile and / or nonvolatile memory, e.g., cache and / or buffer memory and / or RAM (Random Access Memory) and / or ROM (Read-Only Memory) and / or optical memory and / or EPROM (Erasable Programmable Read-Only Memory). Thus, the network node 16 further has software 74 stored internally in, for example, memory 72, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the network node 16 via an external connection. The software 74 may be executable by the processing circuitry 68. The processing circuitry 68 may be configured to control any of the methods and / or processes described herein and / or to cause such methods, and / or processes to be performed, e.g., by network node 16. Processor 70 corresponds to one or more processors 70 for performing network node 16 functions described herein. The memory 72 is configured to store data, programmatic software code and / or other information described herein. In some embodiments, the software 74 may include instructions that, when executed by the processor 70 and / or processing circuitry 68, causes the processor 70 and / or processing circuitry 68 to perform the processes described herein with respect to network node 16. For example, processingcircuitry 68 of the network node 16 may include configuration unit 32 configured toperform one or more network node 16 functions described herein such as those functions related to time misalignment reporting associated with various TRPs. The communication system 10 further includes the UE 22 already referred to. The UE 22 may have hardware 80 that may include a radio interface 82 configured to set up and maintain a wireless connection 64 with a network node 16 serving a coverage area 18in which the UE 22 is currently located. The radio interface 82 may be formed as or mayinclude, for example, one or more RF transmitters, one or more RF receivers, and / or one or more RF transceivers. The hardware 80 of the UE 22 further includes processing circuitry 84. The processing circuitry 84 may include a processor 86 and memory 88. In particular, in addition to or instead of a processor, such as a central processing unit, and memory, the processing circuitry 84 may comprise integrated circuitry for processing and / or control, e.g., one or more processors and / or processor cores and / or FPGAs (Field Programmable Gate Array) and / or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions. The processor 86 may be configured to access (e.g., write to and / or read from) memory 88, which may comprise any kind of volatile and / or nonvolatile memory, e.g., cache and / or buffer memory and / or RAM (Random Access Memory) and / or ROM (Read-Only Memory) and / or optical memory and / or EPROM (Erasable Programmable Read-Only Memory). Thus, the UE 22 may further comprise software 90, which is stored in, for example, memory 88 at the UE 22, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the UE 22. The software 90 may be executable by the processing circuitry 84. The software 90 may include a client application 92. The client application 92 may be operable to provide a service to a human or non-human user via the UE 22. The client application 92 may interact with the user to generate the user data that it provides. The processing circuitry 84 may be configured to control any of the methods and / or processes described herein and / or to cause such methods, and / or processes to be performed, e.g., by UE 22. The processor 86 corresponds to one or more processors 86 for performing UE 22 functions described herein. The UE 22 includes memory 88 that is configured to store data, programmatic software code and / or other information described herein. In some embodiments, the software 90 and / or the client application 92 may include instructions that, when executed by the processor 86 and / or processing circuitry 84, causes the processor 86 and / or processing circuitry 84 to perform the processes described hereinwith respect to UE 22. For example, the processing circuitry 84 of the user equipment 22may include a quantization unit 34 configured to perform one or more UE 22 functionsdescribed herein such as those functions related to time misalignment reporting associated with various TRPs. In some embodiments, the inner workings of the network node 16 and UE 22, maybe as shown in FIG. 10 and independently, the surrounding network topology may be thatof FIG.9. The wireless connection 64 between the UE 22 and the network node 16 is in accordance with the teachings of the embodiments described throughout this disclosure. In some embodiments, the cellular network also includes the network node 16 with a radio interface 62. In some embodiments, the network node 16 is configured to, and / or the network node’s 16 processing circuitry 68 is configured to perform the functions and / or methods described herein for preparing / initiating / maintaining / supporting / ending a transmission to the UE 22, and / or preparing / terminating / maintaining / supporting / ending in receipt of a transmission from the UE 22. In some embodiments, the UE 22 is configured to, and / or comprises a radio interface 82 and / or processing circuitry 84 configured to perform the functions and / or methods described herein for preparing / initiating / maintaining / supporting / ending a transmission to the network node 16, and / or preparing / terminating / maintaining / supporting / ending in receipt of a transmission from the network node 16. Although FIGS. 9 and 10 show various “units” such as configuration unit 32, andquantization unit 34 as being within a respective processor, it is contemplated that theseunits may be implemented such that a portion of the unit is stored in a correspondingmemory within the processing circuitry. In other words, the units may be implemented inhardware or in a combination of hardware and software within the processing circuitry. For example, in some embodiments, the telecommunication system 10 includes one or more Open-RAN (ORAN) network nodes 16. An ORAN network node 16 is a node in the telecommunication system 10 that supports an ORAN specification (e.g., a specification published by the O-RAN Alliance, or any similar organization) and may operate alone or together with other nodes to implement one or more functionalities of any node in the telecommunication system 10, including one or more network nodes 16 in the access network 12 and / or core network nodes 14. Examples of an ORAN network node 16 include an open radio unit (O-RU), an open distributed unit (O-DU), an open central unit (O-CU), including an O-CU control plane (O-CU-CP) or an O-CU user plane (O-CU-UP), a RAN intelligent controller (near- real time or non-real time) hosting software or software plug-ins, such as a near-real time control application (e.g., xApp) or a non-real time control application (e.g., rApp), or any combination thereof (the adjective “open” designating support of an ORAN specification). The network node may support a specification by, for example, supporting an interface defined by the ORAN specification, such as an A1, F1, W1, E1, E2, X2, Xn interface, an open fronthaul user plane interface, or an open fronthaul management plane interface. Moreover, an ORAN access node may be a logical node in a physical node. Furthermore,an ORAN network node may be implemented in a virtualization environment (described further below) in which one or more network functions are virtualized. For example, the virtualization environment may include an O-Cloud computing platform orchestrated by a Service Management and Orchestration Framework via an O-2 interface defined by the O-RAN Alliance or comparable technologies. The network nodes 16 facilitate direct orindirect connection of user equipment (UE), such as by connecting UEs 22a, 22b, 22c, and 22d (one or more of which may be generally referred to as UEs 22) to the core network 14 over one or more wireless connections. FIG. 11 is a block diagram illustrating a virtualization environment 94 in whichfunctions implemented by some embodiments may be virtualized. In the present context, virtualizing means creating virtual versions of apparatuses or devices which may include virtualizing hardware platforms, storage devices and networking resources. As used herein, virtualization can be applied to any device described herein, or components thereof, and relates to an implementation in which at least a portion of the functionality is implemented as one or more virtual components. Some or all of the functions described herein may be implemented as virtual components executed by one or more virtual machines (VMs) implemented in one or more virtual environments 94 hosted by one or more of hardware nodes, such as a hardware computing device that operates as a network node, UE, core network node, or host. Further, in embodiments in which the virtual node does not require radio connectivity (e.g., a core network node or host), then the node may be entirely virtualized. In some embodiments, the virtualization environment 94 includes components defined by the O-RAN Alliance, such as an O-Cloud environment orchestrated by a Service Management and Orchestration Framework via an O-2 interface. Applications 96 (which may alternatively be called software instances, virtual appliances, network functions, virtual nodes, virtual network functions, etc.) are run in the virtualization environment 94 to implement some of the features, functions, and / or benefits of some of the embodiments disclosed herein. Hardware 98 includes processing circuitry, memory that stores software and / or instructions executable by hardware processing circuitry, and / or other hardware devices as described herein, such as a network interface, input / output interface, and so forth. Software may be executed by the processing circuitry to instantiate one or more virtualization layers 100 (also referred to as hypervisors or virtual machine monitors (VMMs)), provide VMs 102a and 102b (one or more of which may be generally referred to as VMs 102), and / or perform any of the functions, features and / or benefits described in relation with some embodiments described herein. The virtualization layer 100 may present a virtual operating platform that appears like networking hardware to the VMs 102. The VMs 102 comprise virtual processing, virtual memory, virtual networking or interface and virtual storage, and may be run by a corresponding virtualization layer 100. Different embodiments of the instance of a virtual appliance 96 may be implemented on one or more of VMs 102, and the implementations may be made in different ways. Virtualization of the hardware is in some contexts referred to as network function virtualization (NFV). NFV may be used to consolidate many network equipment types onto industry standard high volume server hardware, physical switches, and physical storage, which can be located in data centers, and customer premise equipment. In the context of NFV, a VM 102 may be a software implementation of a physical machine that runs programs as if they were executing on a physical, non-virtualized machine. Each of the VMs 102, and that part of hardware 98 that executes that VM, be it hardware dedicated to that VM and / or hardware shared by that VM with others of the VMs, forms separate virtual network elements. Still in the context of NFV, a virtual network function is responsible for handling specific network functions that run in one or more VMs 102 on top of the hardware 98 and corresponds to the application 96. Hardware 98 may be implemented in a standalone network node with generic or specific components. Hardware 98 may implement some functions via virtualization. Alternatively, hardware 98 may be part of a larger cluster of hardware (e.g. such as in a data center or CPE) where many hardware nodes work together and are managed via management and orchestration 104, which, among others, oversees lifecycle management of applications 96. In some embodiments, hardware 98 is coupled to one or more radio units that each include one or more transmitters and one or more receivers that may be coupled to one or more antennas. Radio units may communicate directly with other hardware nodes via one or more appropriate network interfaces and may be used in combination with the virtual components to provide a virtual node with radio capabilities, such as a radio access node or a base station. In some embodiments, some signaling can be provided with the use of a control system 106 which may alternatively be used for communication between hardware nodes and radio units. FIG. 12 is a flowchart of an exemplary process in a network node 16 according tosome embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more ofprocessing circuitry 68 (including the configuration unit 32), processor 70, radio interface62 and / or communication interface 60. Network node 16 is configured to receive (BlockS100), from the UE 22, an indication of a quantized time misalignment between a firstTransmission-Reception Point, TRP and a second TRP, where the quantized time misalignment is according to a configuration for quantizing, as described herein. Networknode 16 is configured to perform (Block S102) at least one action based on the indication,as described herein. According to one or more embodiments, the configuration for quantizing comprises at least one of: a reference value for normalizing the time misalignment against a reference value; a number of bits for quantizing the time misalignment; a subband size; or a maximum range of time misalignment to report. According to one or more embodiments, the reference value is a function of a duration of a cyclic prefix ^^^, e.g., 0.5 ^^^. According to one or more embodiments, the subband size is according to one of: a channel quality indicator, CQI, reporting according to a channel state information, CSI, report; or a precoding matrix indicator, PMI, reporting according to the CSI report. According to one or more embodiments, the network node is further configured to transmit the configuration for quantizing to the UE. According to one or more embodiments, the network node is further configured to receive a report of UE capabilities, the configuration for quantizing being based on at least on the UE capabilities, where the report of the UE capabilities comprises at least one of: whether the UE supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting; or whether the UE supports a one-part CSI report or two-part CSI report. FIG. 13 is a flowchart of another example process in a network node 16 accordingto some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more of processing circuitry 68 (including the configuration unit 32), processor 70, radio interface62 and / or communication interface 60. Network node 16 is configured to transmit (BlockS104) a configuration for quantizing a time misalignment between a first reference signal, RS, and a second RS, where the first RS is associated with a first resource set and the second RS is associated with a second resource set that is different from the first resourceset, as described herein. For example, the two RSs may belong to two resource sets whereeach resources set has a respective resource set identifier (ID). Network node 16 isconfigured to receive (Block S106), from the UE 22, an indication of a quantized timemisalignment, where the quantized time misalignment is based on the configuration, asdescribed herein. Network node 16 is configured to perform (Block S108) at least oneaction based on the indication, as described herein. According to one or more embodiments, the configuration comprises one or bothof: a first reference value that is a function of a time duration of a cycle prefix, Tcp; and asecond value that indicates a number of bits for quantizing the time misalignment among multiple transmission reception points, TRPs. According to one or more embodiments, the time duration of the cycle prefix comprises one of: 0.5Tcp, Tcp and 2Tcp. According to one or more embodiments, the indication of the quantized timemisalignment comprises a binary codepoint that is used to indicate that a timemisalignment exceeds a measurement range.According to one or more embodiments, the quantizing of the time misalignment is associated with coherent joint transmission, CJT, comprising: a first transmission reception point, TRP, associated with the first resource set; and a second TRP associatedwith the second resource set. For example, each TRP 17 is associated with a CSI-RSresource set, via CSI-RS resource set ID. According to one or more embodiments, the configuration is transmitted via RRC signaling; and the configuration comprising at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement. According to one or more embodiments, the network node is further configured toreceive a report of UE capabilities, the report of the UE capabilities comprising whetherthe UE supports a configuration of pre-compensated coherent joint transmission, CJT,channel state information, CSI, reporting; and the configuration being based on at least onthe UE capabilities. FIG. 14 is a flowchart of an exemplary process in a user equipment 22 according tosome embodiments of the present disclosure. One or more blocks described herein may beperformed by one or more elements of user equipment 22 such as by one or more ofprocessing circuitry 84 (including the quantization unit 34), processor 86, radio interface82 and / or communication interface 60. UE 22 is configured to receive (Block S110) a first reference signal, RS, from a first Transmission-Reception Point, TRP, as described herein. UE 22 is configured to receive (Block S112) a second RS from a second TRP, as described herein. UE 22 is configured to quantize (Block S114) a time misalignment associated with the first and second TRPs according to a configuration for quantizing, asdescribed herein. UE 22 is configured to indicate (Block S118) the quantized timemisalignment to the network node 16, as described herein. According to one or more embodiments, the configuration for quantizing comprises at least one of: a reference value for normalizing the time misalignment against a reference value; a number of bits for quantizing the time misalignment; a subband size;or a maximum range of time misalignment to report.According to one or more embodiments, the reference value is a function of a duration of a cyclic prefix ^^^, e.g., 0.5 ^^^. According to one or more embodiments, the subband size is according to one of: a channel quality indicator, CQI, reporting according to a channel state information, CSI, report; or a precoding matrix indicator, PMI, reporting according to the CSI report. According to one or more embodiments, the configuration for quantizing is received from the network node 16. According to one or more embodiments, the UE 22 is further configured to report UE 22 capabilities to the network node, the reporting of UE 22 capabilities comprising at least one of: whether the UE 22 supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting; or whether the UE supports a one-part CSI report or two-part CSI report. FIG. 15 is a flowchart of another example process in a user equipment 22according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of user equipment 22 such as by one or more of processing circuitry 84 (including the quantization unit 34), processor 86, radiointerface 82 and / or communication interface 60. UE 22 is configured to receive (BlockS118) a configuration for quantizing a time misalignment between a first reference signal,RS, and and a second RS where the first RS is associated with a first resource set and thesecond RS is associated with a second resource set that is different from the first resource set, as described herein. UE 22 is configured to quantize (Block S120) a timemisalignment between the first RS and and the second RS according to the configurationfor quantizing, as described herein. UE 22 is configured to transmit (Block S122) anindication of the quantized time misalignment, as described herein. According to one or more embodiments, the configuration comprises one of both of: a first reference value that is a function of a time duration of a cycle prefix, Tcp; and a second value that indicates a number of bits for quantizing the time misalignment among multiple transmission reception points, TRPs. According to one or more embodiments, the time duration of the cycle prefix comprises one of: 0.5Tcp, Tcp and 2Tcp. According to one or more embodiments, the indication of the quantized timemisalignment comprises a binary codepoint that is used to indicate that a timemisalignment exceeds a measurement range.According to one or more embodiments, the quantizing of the time misalignment is associated with coherent joint transmission, CJT, comprising: a first transmissionreception point, TRP, associated with the first resource set; and a second TRP associatedwith the second resource set. According to one or more embodiments, the configuration is received via radio resource control, RRC, signaling; and the configuration comprising at least one RRCparameter that is based on one or more of: a numerology; a subcarrier spacing; a durationof a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement. According to one or more embodiments, the UE is further configured to transmit areport of UE capabilities, where the report of the UE capabilities comprises whether the UE supports a configuration of pre-compensated coherent joint transmission, CJT, channelstate information, CSI, reporting, and the configuration being based on at least on the UEcapabilities. Having described the general process flow of arrangements of the disclosure and having provided examples of hardware and software arrangements for implementing the processes and functions of the disclosure, the sections below provide details and examples of arrangements for time misalignment reporting associated with various TRPs. Some embodiments provide time misalignment reporting associated with various TRPs. One or more UE 22 functions described below may be performed by one or more of processing circuitry 84, processor 86, quantization unit 34, radio interface 82, etc. One or more network node 16 functions described below may be performed by one or more ofprocessing circuitry 68, processor 70, configuration unit 32, radio interface 62, etc. An example flowchart of a procedure for reporting time misalignment between TRPs is illustrated in FIG.16: In an optional Step 1, a UE 22 sends a capability report to a network node 16 (e.g.,a gNB) on whether the UE 22 supports reporting of time misalignment among TRPs. In Step 2, UE 22 receives higher layer configuration from the network node 16 onCSI report configuration for reporting information on time misalignment between TRPs. In Step 3, the UE 22 receives the reference signals from the network node 16. Afirst one or more reference signal(s) are associated with a first TRP, and a second one ormore reference signal(s) are associated with a second TRP. In the example of FIG. 16, thefirst one or more reference signal(s) are shown as TRS #1 or CSI-RS (or NZP CSI-RS) #1; the second one or more reference signal(s) are shown as TRS #2 or CSI-RS (or NZP CSI- RS) #2. In Step 4, UE 22 receives from the network node 16 a request (or trigger) for anaperiodic CSI report to report the time misalignment the multiple TRPs (i.e., the request may trigger the CSI report containing time misalignment between the multiple TRPs the UE measures). In Step 5, upon receiving the request, UE 22 transmits to the network node 16 theCSI report containing time misalignment between the multiple TRPs. Note that in legacy NR, in some cases when the reference signal(s) are aperiodic,then the UE 22 is triggered to perform measurements on the aperiodic reference signalsand to report the triggered reporting quantity (i.e., the measured quantity) in the same DCI. However, in some cases, when the UE 22 is triggered to perform measurements and then to report the measurements, the UE 22 cannot be triggered with any other reports, and / or other data transmission / reception until the triggered report has been transmitted by the UE22. In case the report is associated with a reporting delay (for example, due to the time ittakes for the UE 22 to perform the associated measurements, calculations etc.), this kind of behavior can introduce additional latency in the system, which for example can reduce the performance for UEs 22 requiring in low latency communication (e.g., in URLLC, XR communication etc.). Therefore, in 6G, it is possible that a measurement (and associated calculations) might be triggered with one DL message and the following report might be triggered in a separate DL message. Hence, in some optional embodiments, Step 4, is divided in two separate steps (e.g., downlink control messages), where a first message / step is used to trigger the UE 22 to perform measurements and then a second message / step is used to trigger the UE 22 to transmit the report.In Step 2 and Step 5 there is included details for the network / network node 16configuring the report and UE 22 generating the report. In particular, in Step 2, UE 22 receives configuration of a CSI report and / or additional configuration information from the network node 16 for reporting information on time misalignment between TRPs. As part of the CSI report configuration and / or the additional configuration information, thenetwork node 16 configures the UE 22 with one or more parameter(s) for measuringand / or calculating (or computing) a time misalignment report. In practice, the level of time misalignment among multiple TRPs depends on one or more factors, such as hardware quality, deployment scenario, UE’s position / mobility, etc. In addition, depending on the application / implementation, time misalignment report may require different levels of accuracy. Hence, it may be beneficial to configure such report according to an expected level of time misalignment and / or required accuracy. In some embodiments, the CSI report configuration for reporting time misalignment between TRPs is conveyed in RRC, which contains one or more parameter(s) for calculating (or computing) a time misalignment report. In some embodiments, the one or more RRC parameter(s) define the value range (i.e., the quantization method) of the time misalignment values to be reported. The examples ofparameters given below are non-limiting as in some other embodiments, one or more ofthese parameters to be pre-specified in 3GPP specifications. In some furtherembodiments, a subset of these parameters are RRC configured while the other sub-set is pre-specified in 3GPP specifications. ^In some embodiments, the value range and / or resolution is given by one or more ofa max (∆^_^^^) and / or a min (∆^_^^^) value(s), a step-size (∆^_^^^^^^^^), and the number of quantization bits used to represent a quantized time misalignment value. ^In some embodiments, a value range is specified by a step-size, and the number ofquantization bits used to represent a quantized time misalignment value. ^In some embodiments, the value range is specified by a max and / or a min value(s)and the total number of quantized time misalignment values. ^In some embodiments, the value range is specified by a max and / or a min value(s)and the number of bits used to quantize and report the quantity. ^In some embodiments, the value range contains a mapping between timemisalignment to a binary codepoints, or an integer index.^ In some embodiments, one binary codepoint is used to indicate time misalignmentis between 0 and minimum step-size, or the time misalignment is close to 0, e.g., a code point of all ‘0’s or all ‘1’s. ^In some embodiments, one binary codepoint is used to indicate time misalignmentexceeds the measurement range, or the time misalignment is not measurable and thus unknown, e.g., a code point of all ‘0’s or all ‘1’s.^ In some embodiments, one bit is used to indicate the sign of time misalignment.^ In one embodiment, the max / min values are determined by a specification, or pre-defined rule. Alternatively, the max / min values can be configured by the network node 16. ^In one embodiment, the network node 16 configures the UE 22 with at least one ofthe following: ^a first reference value; and^ a second value indicating the number of bits for quantizing the timemisalignment among multiple TRPs. In some embodiments, the first reference value and the second value are both RRC parameters. In another embodiment, the first reference value is an RRC parameter while the second value is pre-defined in 3GPP specifications. Both the first and second parameters are used by the UE 22 to determine the step size of time misalignment. In one embodiment, the first reference value is a function of, ^^^ , the time durationof cyclic prefix (CP), e.g., 0.5^^^, 2^^^, etc. In one embodiment, the reference value can be defined as a scaled version of the CP duration which can be represented by ^^^^wherein ^ is a scaling factor. Some example values of ^ are 0.5, 0.8, 1, 1.1, and 2. Inanother embodiment, the first reference value is the maximum possible value for time misalignment which is configurable. In one detailed embodiment, the network node 16 indicates that the cyclic prefix is one of the following options: ^A normal cyclic prefix, for symbol#0 or symbol#7^ A normal cyclic prefix, for a symbol other than symbol#0 or symbol#7^ An extended cyclic prefixSince different numerologies have different lengths of CPs, in one embodiment,the CP used here is associated with the numerology (i.e., subcarrier spacing) of the associated bandwidth part (BWP) where the report is configured / triggered, or the CP of the associated reference signal that is configured for time misalignment measurement. In another embodiment, the CP used here is associated with the numerology (or subcarrier spacing) of the BWP associated with the CSI resource configuration in which the downlink reference signals (e.g., NZP CSI-RSs) used for measuring time misalignment between TRPs are configured. For instance, when a bandwidth part X is configured via the parameter ‘bwp-Id’ in the CSI-ResourceConfig IE (i.e., CSI resource configuration) in which the downlink reference signals used for measurement of time misalignment between TRPs are configured, the numerology is given by the field ‘subcarrierSpacing’ defined in the BWP IE associated with BWP X. In the above description, the IEs CSI- ResourceConfig and BWP are as defined in 3GPP, e.g., 3GPP TS 38.331 V18.0.0. In some embodiment, the reference value determines a range of the time alignment can be reported. In one example, the reference value ^^^^specifies the maximum time alignment value where the number of bits are used to indicate uniformly quantized valuesbetween 0 and ^^^^, or between (−^^^^ , .. , ^^^^), where the value of ^ is configurable bya higher layer. In another embodiment, the reference value is a function of the numerology (^ ∈{0, .. ,6}) and / or subcarrier spacing {15khz,..,960khz}.In one embodiment, the reference value and number of bits is dependent on one or more of: ^total number of TRPs / CSI-RSs to report,^ Mapping configuration of CSI-RS including number of ports, density, OFDMsymbol in time domain, frequency domain occupation ^CSI-RS periodicity^ Time difference between the CSI-RS measureIn another embodiment, the reference value is in seconds, microseconds, nanoseconds, e.g., 100 ns. In one embodiment, the network node 16 configures the UE a value (e.g., via a RRC parameter) indicating the subband size that shall be used for calculating the time misalignment report. For a given time misalignment, a larger subband size will introduce a larger phase rotation across a subband, hence, for a given number of bits, a smaller reference value (or a smaller step size) is needed for time misalignment reporting. In other words, in this embodiment, the reference value (or step size) for the time misalignment report is dependent on the subband size configured to the UE. In some embodiments, the subband size is the CQI reporting subband size of a configured CSI report. For example, it is the same as the higher layer parametersubbandSize in the CSI-ReportConfig information element in RRC.In some embodiments, , the subband size is the PMI reporting subband size of a configured CSI report. For example, for Rel-16 eType II CSI reporting, the PMI reportingsubband size is subbandSize / ^, where ^ ∈ {1,2} is the codebook parameter of Rel-16eType II codebook.In one detailed embodiment, the subband size is configured as part ofCSI-Reportconfig as defined in 3GPP, e.g., 3GPP TS 38.331 for a CJT type II CSI reportas defined in 3GPP TS 38.214 V18.1.0 clause 5.2.2.2.8. In some embodiments, two or more of the above parameters are jointly configured, e.g., through a look-up table. In other words, the value range of time misalignment is configurable by two or more parameters, e.g., the first parameter is the reference value in terms of ^^^, and the second parameter is the number of bits, respectively. Given the two or more configuration parameters, the UE 22 can determine the quantization method (value range, step size, mapping to binary codepoint etc.) to report time misalignment. An example is shown in Table 3, the table can be defined in 3GPP specifications,while the network node 16 configures the index to the UE 22. Table 3 Example of jointly configuring reference value and number of bits.parameterCombination index Reference value (^^^) Number of bits1 0.25 62 0.25 83 0.5 84 2 10Another example is shown in Table 4, where the value range of time misalignment is configurable with respect to 3 parameters: the subband size (PRB), reference value in terms of T_CP and number of bits. Table 4 Example of jointly configuring subband size, reference value and numberof bits. parameterCombination Subband size Reference value Number of bits index (PRB) (^^^) 14 0.5 82 8 0.25 83 4 1 94 8 0.5 9In another example, different quantization tables may be captured in 3GPP specifications for difference reference values and / or different number of bits. In order to quantize the measured time misalignment values, the UE 22 determines one of the tables depending on the reference value and / or the associated number of bits. In Step 5, UE 22 reports the quantized time misalignment value to the networknode 16. As a part of Step 5, UE 22 calculates and quantizes the time misalignmentsaccording to the configured and / or predefined parameters / values for time misalignmentreporting. In some embodiments, the UE 22 calculates the misalignments with respect to aselected reference TRP / DL-RS. In some embodiments, the reference TRP is indicated bythe network node 16, understood from pre-defined rules or selected by the UE 22.In case of a reference value being configured, UE 22 obtains a normalized timemisalignment value, by normalizing the estimated time misalignment value with thereference value, and then quantizing the normalized time misalignment value withconfigured / pre-defined number of bits. Such quantization could be performed, for example, with uniformly quantization between -1 and 1. Here, the max / min values are 1 and -1, respectively, can be pre-defined according to specification in a standard. For example, assume that a reference value of 0.5^^^is configured, where ^^^is defined as the duration of cyclic prefix (e.g., for normal cyclic prefix for OFDM symbolother than 0 and 7). Assuming 15 kHz subcarrier spacing is configured, then ^^^ = 4.69us for this case. If the UE 22 estimates a time misalignment (e.g., w.r.t a reference TRP) of-1.5 us, then the UE 22 calculates the normalized time misalignment value^^.^ = −0.64. This value will be quantized with, say 8 bits, uniformly between -1 and 1. An example of the corresponding codepoint is “00101110” with the corresponding quantized value of −0.63671875. Then, the UE reports “00101110” to the network node 16. In one embodiment, along with reporting the quantized values of the time misalignments, the UE22 send an implicit or explicit indication of the selected reference TRP to the networknode 16. In this way, the network node 16 will be provided with information about the quantized time misalignment between the TRPs which enables proper compensation and, thereby, efficient CJT. This addresses one of the topics of interest in Rel-19 as well as 6G. In a further embodiment, the maximum range of the reported time delaydifferences between each TRP and a reference TRP is predefined as |∆^_^^^| =∆^ RB RB^^^ , ^), i.e., a function of ^sc , ∆^^^^ , ^, where, for example, ^sc = 12 is thenumber of subcarriers in a RB, ∆^^^^ = 15^^^ is the reference subcarrier spacing and^ ∈ {0,1,2,3,4} is the numerology configured for the DL RS. An example is^^^RBsc , ∆^^^^, ^^^with this setting |∆^_^^^| > ^^, which ensures that the range covers + / - CP for all numerologies.N bits can be used for uniformly quantize the time delay differences with a time resolution given by ^(^^^)^sRcB∆^^^^^^. For a given reported value n (0 ≤ ^ ≤ 2^ − 1), thecorresponding time delay difference, ∆^, can be obtained as ∆^ =(^^^^^^) ^ For example, for ^ = 0, |∆^_^^^| = 5.56^^ and if N=8 , the time resolution is about 43.4ns.For ^ = 1, |∆^_^^^| = 2.78^^ and if N=8, the time resolution is about 21.7ns. Hence therange and resolution are dependent on the numerology and subcarrier spacing configured. The above is equivalent to uniform quantization of a phase change per RB due to adelay difference. The phase change per RB is given by ^ = 2^∆^^^∆^ for a given delaydifference ∆^, where ∆^^^ = ^sRcB∆^^^^2^is the bandwidth per RB in Hertz. Themaximum range of ^ is + / −2^. The phase resolution is 2^ / 2(^^^). For a given reportedvalue n, the corresponding phase change is given by For a PMI subband (SB) size of 8RBs, the phase changes within a PMI subbandfor difference time delay differences and SCS=15kHz and SCS=30kHz are shown in atable illustrated in FIG.17. A large phase change within a subband implies that a large phase offset between two TRPs and thus, a poor performance with joint transmission. A phase change of less than 30 degree within a subband may be needed to achieve a good CJT performance, which means a delay resolution of less than 60ns and 30ns for SCS=15kHz and SCS=30kHz, respectively, according to the table in FIG.17. Therefore, N=8 bits is enough for reporting the time delay differences. Accordingly, one or more embodiments relate to how the reporting quantity, i.e., time misalignment, is quantized in a configurable manner, in terms of, e.g., step size (∆^_^^^^^^^^), number of bits, the max((∆^_^^^) / min((∆^_^^^) / values. For example, the determination of these parameters, e.g., step size and / or the number of quantization bits, can be based on at least one or more of the following factors: ^Numerology^ Subcarrier spacing^ Duration of cyclic prefix^ Extended CP or normal CP^ Subband size^ Configuration of CSI report:o Number of CSI-RSs(TRPs) to report upono Mapping information of CSI-RS including number of ports, density, ofdmsymbol in time domain, frequency domain occupation ^Maximum range of time misalignment to report^ The CSI reporting method (e.g., one- or two-part reporting method),^ The selected (method of) reference DL-RSs,^ The QoS requirements.In one or more embodiments, the time misalignment observed by the UE 22 can have multiple root causes, e.g., hardware impairment / limitations at the network node 16 / network and / or UE 22 sides, propagation delay differences of multipaths, deployment scenarios etc. How UE 22 estimates the time misalignment may not be detailed herein, whilst the focus is on how UE 22 efficiently reports the measured time misalignment to network node 16 using proper quantization. Some non-limiting examples from the UE 22 side include:A method, performed by the UE 22, for reporting the time misalignment of a TRP 17, comprising: receiving from the network node 16 (or access network 12), a configuration for quantizing (reporting quantized) time misalignment, including at least one of: areference value, used for normalizing the time misalignment against thesaid reference value, number of bits for quantizing the time misalignment, subband size, maximum range of time misalignment to report, quantizing the time misalignment according to the configuration for quantization reporting the quantized value, or the bit-mapping index, or binary codepoint to the NW. The method of any one of Examples 1a-i, where the reference value is a function of the duration of the cyclic prefix ^^^, e.g., 0.5 ^^^. The method of any one of Examples 1a-iii, where the subband size is according to the CQI reporting according to a CSI report. The method of any one of Examples 1a-iii, where the subband size is according tothe PMI reporting according to a CSI report. The method of Example 1a, where more than one of the at least one of reference value, number of bits and subband size are jointly configured. The method of Example 1, where the set of quantization methods are mapped to a list of indices. The method of Example 1, where the set of quantization methods are described in a specification, while the UE 22 will receive an index associated to one quantization method. The method of any one of the previous Examples, where the network node 16receives a report about the capabilities of the UE 22, the reporting including informationabout, e.g., Whether or not the UE 22 supports configuration of pre-compensated (e.g., time- misalignment pre-compensated) CJT CSI reporting, The UE 22’s supported method CSI quantity report (one- or two-part CSI report),… The method of Example 1b, where the method for quantizing the timemisalignment depending on the considered (e.g., one- or two-part) reporting method.The method of any one of the above Examples, where the UE 22 receivinga. an indication of the selected reference DL-RS with respect to which the time misalignment is to be measured, b. an indication whether the UE 22 is allowed to select the reference DL-RS with respect to which the time misalignment is measured. Accordingly, one or more of the embodiments and / or examples described herein provide one or more of the following advantages: -enables configurable step size and / or number of quantization bits which canefficiently quantize the time misalignment report for multi-TRP operation with coherent transmission; -enables proper compensation of the inter-TRP delay differences, resultingin efficient CJT; or -address at least one of the challenges of multi-TRP and D-MIMO networkswhich are of interest in both 3GPP Rel-19 and 3GPP 6G. Some Additional Examples Example A1. A network node 16 configured to communicate with a userequipment, UE 22, the network node 16 configured to, and / or comprising a radio interface62 and / or comprising processing circuitry 68 configured to:receive, from the UE 22, an indication of a quantized time misalignment between afirst Transmission-Reception Point, TRP 17 and a second TRP 17, the quantized timemisalignment being according to a configuration for quantizing; and perform at least one action based on the indication. Example A2. The network node 16 of Example A1, wherein the configuration forquantizing comprises at least one of: a reference value for normalizing the time misalignment against a reference value; a number of bits for quantizing the time misalignment; a subband size; or a maximum range of time misalignment to report. Example A3. The network node 16 of Example A2, wherein the reference value isa function of a duration of a cyclic prefix ^^^, e.g., 0.5 ^^^. Example A4. The network node 16 of any one of Examples A2-A3, wherein thesubband size is according to one of: a channel quality indicator, CQI, reporting according to a channel state information, CSI, report; or a precoding matrix indicator, PMI, reporting according to the CSI report. Example A5. The network node 16 of any one of Examples A1-A4, wherein thenetwork node 16 is further configured to transmit the configuration for quantizing to theUE 22.Example A6. The network node 16 of any one of Examples A1-A5, wherein thenetwork node 16 is further configured to receive a report of UE capabilities, the configuration for quantizing being based on at least on the UE capabilities; the report of the UE capabilities comprising at least one of: whether the UE 22 supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting; or whether the UE 22 supports a one-part CSI report or two-part CSI report. Example B1. A method implemented by a network node 16 that is configured tocommunicate with a user equipment, UE 22, the method comprising:receiving, from the UE 22, an indication of a quantized time misalignment betweena first Transmission-Reception Point, TRP 17 and a second TRP 17, the quantized timemisalignment being according to a configuration for quantizing; and performing at least one action based on the indication. Example B2. The method of Example B1, wherein the configuration forquantizing comprises at least one of: a reference value for normalizing the time misalignment against a reference value; a number of bits for quantizing the time misalignment; a subband size; or a maximum range of time misalignment to report. Example B3. The method of Example B2, wherein the reference value is afunction of a duration of a cyclic prefix ^^^, e.g., 0.5 ^^^. Example B4. The method of any one of Examples B2-B3, wherein the subbandsize is according to one of: a channel quality indicator, CQI, reporting according to a channel state information, CSI, report; or a precoding matrix indicator, PMI, reporting according to the CSI report. Example B5. The method of any one of Examples B1-B4, further comprisingtransmitting the configuration for quantizing to the UE 22.Example B6. The method of any one of Examples B1-B5, wherein the networknode 16 is further configured to receive a report of UE capabilities, the configuration for quantizing being based on at least on the UE capabilities; the report of the UE capabilities comprising at least one of: whether the UE 22 supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting; or whether the UE 22 supports a one-part CSI report or two-part CSI report. Example C1. A user equipment (UE 22) configured to communicate with anetwork node 16, the UE 22 configured to, and / or comprising a radio interface 82 and / orprocessing circuitry 84 configured to: receive a first reference signal, RS, from a first Transmission-Reception Point,TRP 17;receive a second RS from a second TRP 17;quantize a time misalignment associated with the first and second TRPs 17according to a configuration for quantizing; andindicate the quantized time misalignment to the network node 16.Example C2. The UE 22 of Example C1, wherein the configuration forquantizing comprises at least one of: a reference value for normalizing the time misalignment against a reference value; a number of bits for quantizing the time misalignment; a subband size; or a maximum range of time misalignment to report. Example C3. The UE 22 of Example C2, wherein the reference value is afunction of a duration of a cyclic prefix ^^^, e.g., 0.5 ^^^. Example C4. The UE 22 of any one of Examples C2-C3, wherein the subbandsize is according to one of: a channel quality indicator, CQI, reporting according to a channel state information, CSI, report; or a precoding matrix indicator, PMI, reporting according to the CSI report. Example C5. The UE 22 of any one of Examples C1-C4, wherein theconfiguration for quantizing is received from the network node 16.Example C6. The UE 22 of any one of Examples C1-C5, wherein the UE 22 isfurther configured to report UE capabilities to the network node 16, the reporting of UEcapabilities comprising at least one of: whether the UE 22 supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting; or whether the UE 22 supports a one-part CSI report or two-part CSI report. Example D1. A method implemented by a user equipment (UE 22) that isconfigured to communicate with a network node 16, the method comprising:receiving a first reference signal, RS, from a first Transmission-Reception Point,TRP 17;receiving a second RS from a second TRP 17;quantizing a time misalignment associated with the first and second TRPs 17according to a configuration for quantizing; and indicating the quantized time misalignment to the network node 16.Example D2. The method of Example D1, wherein the configuration forquantizing comprises at least one of: a reference value for normalizing the time misalignment against a reference value; a number of bits for quantizing the time misalignment; a subband size; or a maximum range of time misalignment to report. Example D3. The method of Example D2, wherein the reference value is afunction of a duration of a cyclic prefix ^^^, e.g., 0.5 ^^^. Example D4. The method of any one of Examples D2-D3, wherein the subbandsize is according to one of: a channel quality indicator, CQI, reporting according to a channel state information, CSI, report; or a precoding matrix indicator, PMI, reporting according to the CSI report. Example D5. The method of any one of Examples D1-D4, wherein theconfiguration for quantizing is received from the network node 16.Example D6. The method of any one of Examples D1-D5, further comprisingreporting UE capabilities to the network node 16, the reporting of UE capabilitiescomprising at least one of: whether the UE 22 supports a configuration of pre-compensated coherent joint transmission, CJT, CSI reporting; or whether the UE 22 supports a one-part CSI report or two-part CSI report. As will be appreciated by one of skill in the art, the concepts described herein may be embodied as a method, data processing system, computer program product and / or computer storage media storing an executable computer program. Accordingly, the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a “circuit” or “module.” Any process, step,action and / or functionality described herein may be performed by, and / or associated to, acorresponding module, which may be implemented in software and / or firmware and / or hardware. Furthermore, the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that can be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices. Some embodiments are described herein with reference to flowchart illustrations and / or block diagrams of methods, systems and computer program products. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer (to thereby create a special purpose computer), special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. These computer program instructions may also be stored in a computer readable memory or storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function / act specified in the flowchart and / or block diagram block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. It is to be understood that the functions / acts noted in the blocks may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality / acts involved. Although some of the diagrams include arrows on communication paths to show a primary direction of communication, it is to be understood that communication may occur in the opposite direction to the depicted arrows. Computer program code for carrying out operations of the concepts described herein may be written in an object oriented programming language such as Python, Java® or C++. However, the computer program code for carrying out operations of thedisclosure may also be written in conventional procedural programming languages, suchas the "C" programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer. In the latter scenario, the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider). Many different embodiments have been disclosed herein, in connection with the above description and the drawings. It will be understood that it would be unduly repetitious and obfuscating to literally describe and illustrate every combination and subcombination of these embodiments. Accordingly, all embodiments can be combined in any way and / or combination, and the present specification, including the drawings, shall be construed to constitute a complete written description of all combinations and subcombinations of the embodiments described herein, and of the manner and process of making and using them, and shall support claims to any such combination or subcombination. It will be appreciated by persons skilled in the art that the embodiments described herein are not limited to what has been particularly shown and described herein above. In addition, unless mention was made above to the contrary, it should be noted that all of the accompanying drawings are not to scale. A variety of modifications and variations arepossible in light of the above teachings without departing from the scope of the followingclaims.

Claims

CLAIMS:

1. A method implemented by a user equipment, UE (22), that is configured tocommunicate with a network node (16), the method comprising:receiving (S118) a configuration for quantizing a time misalignment between a first reference signal, RS, and a second RS, the first RS being associated with a first resource set, the second RS being associated with a second resource set that is different from the first resource set; quantizing (S120) a time misalignment between the first RS and the second RSaccording to the configuration for quantizing; andtransmitting (S122) an indication of the quantized time misalignment.

2. The method of Claim 1, wherein the configuration comprises one or bothof: a first reference value that is a function of a time duration of a cycle prefix, Tcp; and a second value that indicates a number of bits for quantizing the time misalignmentamong multiple transmission reception points, TRPs (17).

3. The method of Claim 2, wherein the time duration of the cycle prefixcorresponds to one of: 0.5Tcp, Tcp and 2Tcp.

4. The method of any one of Claims 1-3, wherein the indication of thequantized time misalignment comprises a binary codepoint that is used to indicate that atime misalignment exceeds a measurement range.

5. The method of any one of Claims 1-4, wherein the quantizing of the timemisalignment is associated with coherent joint transmission, CJT, comprising: afirst transmission reception point, TRP (17), associated with the first resource set;and asecond TRP (17) associated with the second resource set.

6. The method of any one of Claims 1-5, wherein the configuration is receivedvia radio resource control, RRC, signaling; andthe configuration comprising at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement.

7. The method of any one of Claims 1-6, further comprising transmitting areport of UE capabilities, the report of the UE capabilities comprising whether the UE (22)supports a configuration of pre-compensated coherent joint transmission, CJT, channelstate information, CSI, reporting; andthe configuration being based on at least on the UE capabilities.

8. A user equipment, UE (22), configured to communicate with a networknode (16), the UE (22) configured to:receive a configuration for quantizing a time misalignment between a first reference signal, RS, and a second RS, the first RS being associated with a first resource set, the second RS being associated with a second resource set that is different from the first resource set; quantize a time misalignment between the first RS and the second RS according tothe configuration for quantizing; andtransmit an indication of the quantized time misalignment.

9. The UE (22) of Claim 8, wherein the configuration comprises one or bothof: afirst reference value that is a function of a time duration of a cycle prefix, Tcp;and a second value that indicates a number of bits for quantizing the time misalignmentamong multiple transmission reception points, TRPs (17).

10. The UE (22) of Claim 9, wherein the time duration of the cycle prefixcorresponds to one of: 0.5Tcp, Tcp and 2Tcp.

11. The UE (22) of any one of Claims 8-10, wherein the indication of thequantized time misalignment comprises a binary codepoint that is used to indicate that atime misalignment exceeds a measurement range.

12. The UE (22) of any one of Claims 8-11, wherein the quantizing of the timemisalignment is associated with coherent joint transmission, CJT, comprising: afirst transmission reception point, TRP (17), associated with the first resource set;and asecond TRP (17) associated with the second resource set.

13. The UE (22) of any one of Claims 8-12, wherein the configuration isreceived via radio resource control, RRC, signaling; andthe configuration comprising at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement.

14. The UE (22) of any one of Claims 8-13, wherein the UE (22) is furtherconfigured to transmit a report of UE capabilities, the report of the UE capabilitiescomprising whether the UE (22) supports a configuration of pre-compensated coherentjoint transmission, CJT, channel state information, CSI, reporting; andthe configuration being based on at least on the UE capabilities.

15. A method implemented by a network node (16) that is configured tocommunicate with a user equipment, UE (22), the method comprising:transmitting (S104) a configuration for quantizing a time misalignment between a first reference signal, RS, and a second RS, the first RS being associated with a first resource set, the second RS being associated with a second resource set that is different from the first resource set; receiving (S106), from the UE (22), an indication of a quantized timemisalignment, the quantized time misalignment being based on the configuration; and performing (S108) at least one action based on the indication.

16. The method of Claim 15, wherein the configuration comprises one or bothof: a first reference value that is a function of a time duration of a cycle prefix, Tcp; and asecond value that indicates a number of bits for quantizing the time misalignmentamong multiple transmission reception points, TRPs (17).

17. The method of Claim 16, wherein the time duration of the cycle prefixcorresponds to one of: 0.5Tcp, Tcp and 2Tcp.

18. The method of any one of Claims 15-17, wherein the indication of thequantized time misalignment comprises a binary codepoint that is used to indicate that atime misalignment exceeds a measurement range.

19. The method of any one of Claims 15-18, wherein the quantizing of the timemisalignment is associated with coherent joint transmission, CJT, comprising: afirst transmission reception point, TRP (17), associated with the first resource set;and asecond TRP (17) associated with the second resource set.

20. The method of any one of Claims 15-19, wherein the configuration istransmitted via radio resource control, RRC, signaling; andthe configuration comprising at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing;a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement.

21. The method of any one of Claims 15-20, further comprising receiving areport of UE capabilities, the report of the UE capabilities comprising whether the UE (22)supports a configuration of pre-compensated coherent joint transmission, CJT, channelstate information, CSI, reporting; andthe configuration being based on at least on the UE capabilities.

22. A network node (16) configured to communicate with a user equipment,UE (22), the network node (16) configured to:transmit a configuration for quantizing a time misalignment between a first reference signal, RS, and a second RS, the first RS being associated with a first resource set, the second RS being associated with a second resource set that is different from the first resource set; receive, from the UE (22), an indication of a quantized time misalignment, thequantized time misalignment being based on the configuration; and perform at least one action based on the indication.

23. The network node (16) of Claim 22, wherein the configuration comprisesone or both of:a first reference value that is a function of a time duration of a cycle prefix, Tcp; and a second value that indicates a number of bits for quantizing the time misalignmentamong multiple transmission reception points, TRPs (17).

24. The network node (16) of Claim 23, wherein the time duration of the cycleprefix corresponds to one of: 0.5Tcp, Tcp and 2Tcp.

25. The network node (16) of any one of Claims 22-24, wherein the indicationof the quantized time misalignment comprises a binary codepoint that is used to indicatethat a time misalignment exceeds a measurement range.

26. The network node (16) of any one of Claims 22-25, wherein the quantizingof the time misalignment is associated with coherent joint transmission, CJT, comprising: afirst transmission reception point, TRP (17), associated with the first resource set;and a second TRP (17) associated with the second resource set.

27. The network node (16) of any one of Claims 22-26, wherein theconfiguration is transmitted via radio resource control, RRC, signaling; andthe configuration comprising at least one RRC parameter that is based on one or more of: a numerology; a subcarrier spacing; a duration of a cyclic prefix; a subband size; a configuration of a channel state information, CSI, report; a maximum range of time misalignment to report; and at least one quality of service, QoS, requirement.

28. The network node (16) of any one of Claims 22-27, wherein the networknode (16) is further configured to receive a report of UE capabilities, the report of the UEcapabilities comprising whether the UE (22) supports a configuration of pre-compensatedcoherent joint transmission, CJT, channel state information, CSI, reporting; andthe configuration being based on at least on the UE capabilities.

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