FIELD OF INVENTION The present invention relates to handling of TCI state known status mismatch at gNB and UE. More specifically, the present invention relates to different mechanisms to classify CSI report(s) into valid/partially valid/invalid CSI report(s) by defining a new CSI evaluation methodology. This present invention also discloses a new UE behavior of sending different type of (valid/partially valid/invalid) CSI report to inform the gNB about the TCI state known status at the UE. Further, an implicit or explicit signaling method is adopted to inform the type of CSI to the gNB. The present invention further discloses new UE behavior of skipping CSI reports between partially valid/invalid CSI report and valid CSI report during TCI state switching/SCell activation. BACKGROUND OF INVENTION NR uses directional beam forming technique to transmit towards a specific direction. Multiple beams are transmitted from gNB to cover the entire area of a cell. UE receiver antenna spatial filter direction has to be tuned to proper direction as shown in figure 1 to receive beam at peak signal strength. When UE moves from one beam coverage to other beam coverage, UE has to switch from one beam to other beam or adjust its spatial reception direction. For seamless switch from one beam to another beam, UE has to track and report multiple beams to gNB. To facilitate beam tracking, reporting and switching between beams, each beam is associated with a Transmission Configuration Indication (TCI) state. gNB indicates TCI states to UE through RRC signaling. Each TCI state is associated with a reference signal such as SSB and/or CSI-RS. In other words, indication of a TCI state for PDSCH and/or PDCCH transmission implies informing the device that a certain PDSCH and/or PDCCH is transmitted using the same spatial filter as the configured reference signal such as SSB/CSI-RS. CORESET [4] is a set of physical resources (a specific area on NR Downlink Resource Grid) and a set of parameters that is used to carry PDCCH/DCI. In short it is equivalent to LTE PDCCH area. UE can be configured with upto 64 candidate PDCCH TCI states. By using MAC CE [8], network can dynamically indicate UE to switch to a specific TCI state, within the perCORESET [4]-configured subset. When monitoring for PDCCH within a certain CORESET, the UE can assume that the PDCCH transmission uses the same spatial filter as the reference signal associated with the indicated TCI by means of MAC CE. In other words, if the device has earlier determined a suitable receiver-side beam direction for reception of the reference signal, the device can assume that the same beam direction is suitable for reception of the PDCCH [9]. A device can be configured with upto 128 candidate TCI states. For PDSCH beam indication, there are two methods defined depending on the scheduling offset. That is, depending on the transmission timing of the PDSCH relative to the corresponding PDCCH carrying scheduling information for the PDSCH. If this scheduling offset is larger than N symbols, the DCI of the scheduling assignment may explicitly indicate the TCI state for the PDSCH transmission. To enable this, the device is first configured with a set of up to eight TCI states from the originally configured set of candidate TCI states, which can be called as active TCI states. A three-bit indicator within the DCI then indicates the exact TCI state valid for the scheduled PDSCH transmission. If the scheduling offset is smaller or equal to N symbols, the device should instead assume that the PDSCH transmission is QCL with the corresponding PDCCH transmission [9]. In short, TCI state switch for PDCCH is triggered using MAC CE. TCI state switch for PDSCH is triggered using combination of MAC CE and DCI. Active TCI state switch for PDSCH is triggered using DCI. TCI switch delay depends on the TCI state known status. As per TS 38.133 V15.6.0, The TCI state is known if it has been meeting the following conditions: TCI state switch is within [X] ms of last transmission for beam reporting/ measurement for the target TCI state, The UE has sent at least 1 measurement report for the target TCI state, The TCI state shall remain detectable during the TCI state switching period, SNR of the TCI state is > -3dB, Otherwise, the TCI state is unknown. The gNB may ask UE to switch to known or unknown TCI state based on the time when the beam report is received from UE. In context of this document, beam and TCI state are used interchangeably. They both carry same meaning, unless otherwise stated Ll-RSRP is part of CSI-report. In the context of this document, CSI report and Ll-RSRP report, Ll-RSRP are used interchangeably. They both carry same meaning unless otherwise stated Tfirst_csi: First CSI report instance after TCI switch command; According to 4G standards and/or current 5G standards, TCI state known status mismatch at gNB and UE cannot be handled according to 5G requirement. TCI state switch delay depends on TCI state is known to UE or not. TCI state can be considered known at UE if the beam report is sent by UE less than [X] milliseconds (ms) ago. UE TCI state can be considered known at gNB if beam report is received by gNB less than [X] ms ago. [X] May depend on UE speed and power class. Since UE speed may not be known at gNB, which may lead to mismatch in the assumption/estimation of [X] at gNB. Which results in the inaccurate TCI state known status of UE at gNB. Accurate assumption of TCI state known to UE at gNB is required for effective determination of TCI switching delays. When the assumption at gNB about the TCI state known to UE is incorrect, it results in inaccurate assumption of TCI switch delay requirements at gNB and UE, which results in suboptimal performance. As a result, performance degradation or loss of scheduling opportunities will occur during NR TCI state switch. SUMMARY OF THE INVENTION The following presents a simplified summary of the subject matter in order to provide a basic understanding of some aspects of subject matter embodiments. This summary is not an extensive overview of the subject matter. It is not intended to identify key/critical elements of the embodiments or to delineate the scope of the subject matter. In order to overcome at least the problems discussed above, the present invention provides solution in one aspect wherein reporting channel state information, CSI, to a radio station by a user equipment, UE, involves measuring at least one beam for beam measurement report and CSI report; sending the beam measurement report of the at least one beam to the radio station; receiving, from the radio station, a transmission configuration indicator, TCI, state indication in response to the beam measurement report of the at least one beam; measuring at least one specific beam indicated by the TCI state indication to acquire the CSI of the at least one specific beam; wherein sending a valid CSI report of the at least one specific beam, if the beam measurement report of the at least one specific beam was transmitted within a predetermined time; and sending a partially valid CSI report or an invalid CSI report of the at least one specific beam, if the beam measurement report of the at least one specific beam was transmitted more than a predetermined time ago. The UE is allowed to send the valid CSI report, if the UE successfully acquire the CSI of the at least one specific beam regardless of a timing of the beam measurement report of the at least one specific beam; wherein the valid CSI report uses value or values defined for successful CSI reporting wherein the UE successfully acquire the CSI, and whereas the partially valid CSI report or the invalid CSI report uses a value outside the defined value or values for the successful CSI reporting. The present invention also facilitates the plurality of CSI reports to be sent by UE to radio station, that are partially valid or invalid till UE acquires valid CSI report; or the plurality of CSI reports skipped by the UE, from sending to radio station, in between the partially valid or invalid CSI report and valid CSI report. Further, the CSI is measured by UE, on next available CSI resource for evaluation, during and upon acquisition of the specified beam. The PDSCH/PDCCH are received on a new TCI known state. Further, CSI report is categorized into partially valid or invalid CSI report, upon determination of an unknown beam at the UE wherein the partially valid CSI report is reported to the radio station, which also comprises of reporting of invalid CSI report to the radio station. The present invention also provides TCI state indication command to the UE upon determination of TCI state known status of the UE as TCI state known wherein providing TCI state indication command to the UE is done by configuring different TCI switching delay for the unknown TCI state of the UE. In another embodiment of the present invention, a communication system for reporting channel state information, CSI, is provided which comprises of a radio station; a user equipment, UE, wherein the UE is configured to measure at least one beam for beam measurement report and CSI report, from the radio station; and to send the beam measurement report of the at least one beam to the radio station; wherein the radio station is configured to send a transmission configuration indicator, TCI, state indication, to the UE, in response to the beam measurement report of the at least one beam; wherein the UE is further configured to measure at least one specific beam indicated by the TCI state indication to acquire the CSI of the at least one specific beam; and to send a valid CSI report of the at least one specific beam, if the beam measurement report was transmitted within a predetermined time; and sending, a partially valid CSI report or an invalid CSI report of the at least one specific beam, if the beam measurement report was transmitted more than a predetermined time ago. The UE is also allowed to send the valid CSI report, if the UE successfully acquire the CSI of the at least one specific beam regardless of a timing of the beam measurement report of the at least one specific beam. It is to be noted that the valid CSI report comprises a value or values defined for successful CSI reporting and the partially valid CSI report or the invalid CSI report comprises a value outside the value or values defined for the successful CSI reporting. Further, the radio station is configured to receive the plurality of CSI reports for evaluation, which comprises of partially valid or invalid CSI report till it receives valid CSI report; or the radio station is also configured to skip the plurality of CSI reports for evaluation, which comprises of partially valid or invalid CSI report till it receives valid CSI report. The radio station of the present invention is also configured to receive CSI report for the acquired beam from UE; wherein the radio station transmits PDSCH/PDCCH on a new TCI state and is configured to categorize the CSI report into partially valid or invalid CSI report for the unknown beam. The radio station is further configured to receive partially valid CSI report as well as it is configured to receive invalid CSI report based on applicability. The radio station is further configured to transmit switching command to the UE upon determination of the TCI state known status of the UE as TCI state known and to transmit switching command to the UE by configuring different TCI switching delay for the unknown TCI state of the UE. In an additional embodiment of the present invention, a method of scheduling TCI for a UE by a radio station is also provided; which comprises of registering the UE; receiving at least one beam measurement report; transmitting, a transmission configuration indicator state indication based on the received measurement report which consists of at least one beam; receiving an updated UE TCI state known status implicitly using different type of CSI report during and upon beam acquisition of said TCI state by the UE; wherein receiving, a valid CSI report of the at least one specific beam, if the beam measurement report was received within a predetermined time; and receiving, a partially valid CSI report or an invalid CSI report of the at least one specific beam, if the beam measurement report was received more than a predetermined time ago; and adjusting the TCI switching delay based on the type of CSI report received. In the present invention the radio station, receives plurality of CSI reports from the UE for evaluation which comprises of partially valid or invalid CSI report till it receives valid CSI report; or skipping the plurality of CSI reports from the UE for evaluation in between the partially valid or invalid CSI report and valid CSI report. Further, the transmission of PDSCH/PDCCH on a new TCI known state and receiving partially valid or invalid or valid CSI reports. The present invention also determines UE TCI known state for transmitting switching command and adjusting TCI switching delay according to the updated TCI state known status implicitly acquired from the partially valid or invalid or valid CSI report. BRIEF DESCRIPTION OF FIGURES The foregoing and further objects, features and advantages of the present subject matter will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings, wherein like numerals are used to represent like elements. It is to be noted, however, that the appended drawings along with the reference numerals illustrate only typical embodiments of the present subject matter, and are therefore, not to be considered for limiting of its scope, for the subject matter may admit to other equally effective embodiments. FIGURE 1 illustrates multiple beams transmission. FIGURE 2 illustrates a flow diagram of the UE behaviour in accordance with the present disclosure. FIGURE 3 illustrates UE behaviour when beam report is sent less than a predetermined time ago, according to the present disclosure. FIGURE 4 illustrates UE behaviour when beam report is sent more than a predetermined time ago and UE TCI state known status is TCI state unknown/not known in accordance with the present disclosure. FIGURE 5 illustrates a UE behaviour when beam report is sent more than a predetermined time ago and UE TCI state known status is TCI state known in accordance with the present disclosure. FIGURE 6 illustrates UE behaviour when beam report is sent more than a predetermined time ago, in accordance with the present disclosure. FIGURE 7 illustrates UE behaviour when beam report is sent more than a predetermined time ago and UE TCI state known status is TCI state unknown/not known at UE in accordance with the present disclosure FIGURE 8 illustrates an alternative wherein UE behaviour when beam report is sent more than a predetermined time ago and UE TCI state known status is TCI state unknown/not known at UE in accordance with the present disclosure FIGURE 9 illustrates UE behaviour when beam report is sent more than a predetermined time ago and UE TCI state known status is TCI state known in accordance with the present disclosure FIGURE 10 illustrates CSI evaluation and CSI classification at UE, in accordance with the present disclosure. FIGURE 11 illustrates gNB behavior for the UE behavior, in accordance with the present disclosure. FIGURE 12 illustrates gNB behaviour when beam report was received more than a predetermined time ago (when TCI state indication sent) and UE sends valid CSI report, in accordance with the present disclosure. FIGURE 13 illustrates gNB behaviour when beam report was received more than a predetermined time ago (when TCI state indication sent) and UE sends invalid/partially valid CSI report in accordance with the present disclosure. FIGURE 14 FIGURE 15 FIGURE 16 FIGURE 17 FIGURE 18 FIGURE 19 FIGURE 20 illustrates gNB behaviour when beam report was received more than a predetermined time ago (when TCI state indication sent) and UE sends invalid/partially valid CSI report in accordance with the present disclosure. illustrates UE behavior and gNB behavior during TCI switching error cases, in accordance with the present disclosure. illustrates UE behaviour when beam report was sent less than predetermined time but UE TCI state known status is TCI state unknown/not known/no longer known in accordance with the present disclosure. illustrates an alternate solution of UE behaviour when beam report sent less than predetermined time but UE TCI state known status is TCI state unknown/not known/no longer known in accordance with the present disclosure. illustrates gNB behaviour when beam report was received less than predetermined time (when TCI state indication issued) but UE sends partially valid or invalid CSI report in accordance with the present disclosure. illustrates an alternate solution of gNB behaviour when beam report was received less than predetermined time (when TCI state indication command issued) but UE sends partially valid or invalid CSI report in accordance with the present disclosure. illustrates general block diagram for UE in accordance with the present disclosure. FIGURE 21 illustrates general block diagram for (R)AN in accordance with the present disclosure. FIGURE 22 illustrates a general block diagram for Core Network Node in accordance with the present disclosure. DETAILED DESCRIPTION Exemplary embodiments now will be described with reference to the accompanying drawings. The disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey its scope to those skilled in the art. The terminology used in the detailed description of the particular exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting. In the drawings, like numbers refer to like elements. It is to be noted, however, that the reference numerals in claims illustrate only typical embodiments of the present subject matter, and are therefore, not to be considered for limiting of its scope, for the subject matter may admit to other equally effective embodiments. The specification may refer to "an", "one" or "some" embodiments) in several locations. This does not necessarily imply that each such reference is to the same embodiment(s), or that the feature only applies to a single embodiment. Single features of different embodiments may also be combined to provide other embodiments. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless expressly stated otherwise. It will be further understood that the terms "includes", "comprises", "including" and/or "comprising" when used in this specification, 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. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Furthermore, "connected" or "coupled" as used herein may include operatively connected or coupled. As used herein, the term "and/or" includes any and all combinations and arrangements of one or more of the associated listed items. 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 pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. The figures depict a simplified structure only showing some elements and functional entities, all being logical units whose implementation may differ from what is shown. The connections shown are logical connections; the actual physical connections may be different. It is apparent to a person skilled in the art that the structure may also comprise other functions and structures. Also, all logical units described and depicted in the figures include the software and/or hardware components required for the unit to function. Further, each unit may comprise within itself one or more components which are implicitly understood. These components may be operatively coupled to each other and be configured to communicate with each other to perform the function of the said unit. In the context of this document, TCI state indication, TCI state switch command, beam switch command are used interchangeably. All of them carry same meaning unless otherwise stated First embodiment: In an embodiment (first embodiment) of the present invention and as shown in Fig. 2, the detailed steps describe the UE behavior when the beam report is sent less than predetermined time ago and more than predetermined time ago to solve problem existed in the prior art. The flow of the UE behavior is outlined below. At 201, the RRC reconfiguration for beam management is initiated. At 202, beam measurement report by UE is provided. At 203, the TCI state switch command by gNB is provided. At 204, CSI report by UE is provided and as part of this, UE have to perform TCI state acquisition, CSI computation and evaluation. The CSI report by UE is based on applicability and is categorized, wherein if beam report is sent less than predetermined time ago, then UE shall send valid CSI report, if beam report is sent more than predetermined time ago and if UE cannot acquire beam (i.e. beam is not known), UE sends invalid (or partially valid) CSI report. However, if UE can acquire beam (i.e. beam is known), UE shall send valid CSI report. The valid CSI report is for example the same as legacy CSI report, where it is assumed that the UE can acquire the intended beam successfully. In detail, at 201, once UE is RRC connected, gNB configures UE with SSB/CSI-RS for beam management through RRC reconfiguration. gNB may configure UE with multiple SSB/CSIRS resources for CSI measurement and multiple reporting configurations for CSI measurement report through RRC reconfiguration. At 202, UE performs measurements on the configured measurement resources and reports the measurement report on the configured measurement reporting instance. This measurement report may contain serving beam and/or neighboring beams based on configuration from gNB. Number of beams to be reported is configurable by gNB. Though UE may be measuring in every measurement instance (that is every RS transmission instance), UE will be reporting to gNB only in measurement reporting instance. Number of measurement instances and number of reporting instances may not be same. For example, by considering a scenario where, gNB may be using 8 beams (beam index or TCI state 1, 2, 3... 8) to transmit across the coverage area of the cell. gNB may configure UE to measure one or more beams (for example beam index or TCI state 4, 6, 8). UE measures beams corresponding to beam index 4, 6, and 8 when the measurement resources are available, and reports beam measurement report of beam index 4, 6 and 8 to gNB when reporting resources are available. At 203, based on the beam report from UE, whenever there is a stronger beam (beam index 6 may be stronger in the example described above) than the serving beam (for example beam index or TCI state of serving beam index is 1), gNB may initiate a TCI state switch by issuing a TCI state indication for switching the PDCCH or PDSCH TCI state (i.e. switch to beam index 6 from current serving beam index 1 in the example described above). Upon receiving the TCI state indication/TCI state switch command (i.e. switch to beam index or TCI state 6 in the example described above), via PDCCH (DCI command) or PDSCH (MAC CE or RRC), UE should be able switch to new TCI state with in the TCI switch delay (TTCI switch Delay) as defined [3] below. DCI based TCI switch delay If target TCI state is known: • TTCI SwitchDelay timeDurationForQCL MAC-CE based TCI state switch delay: If target TCI state is known: • TTCI_Switch_Delay = T H A R Q +3 1TLS +TOk*(Tfirst-SSB + TsSB-proc). If Target TCI state is unknown: • TTCI_Switch_Delay = T H A R Q +3 1TLS + T L I - R S R P +TOuk*(Tfirst-SSB+ TsSB-proc) RRC based TCI state delay: If target TCI state is known: • TTCI_Switch_Delay = TRRC_processing +TOk*(Tfirst-SSB + TsSB-proc) If Target TCI state is unknown: • TTCI_Switch_Delay = TRRC_processing + T L 1 - R S R P +TOuk*(Tfirst-SSB + TsSB-proc) Where, timeDurationForQCL is the time required by the UE to perform PDCCH reception and applying spatial QCL information received in DCI for PDSCH processing [7]; THARQ is the timing between DL data transmission and acknowledgement; Tfirst-ssB is time to first SSB transmission after TCI state command is received by the UE; TssB-proc = 2 ms; TOk = 1 if target TCI state is not in the active TCI state list for PDSCH, 0 otherwise; TOuk = 1 for CSI-RS based Ll-RSRP measurement, and 0 for SSB based Ll-RSRP measurement; TLI-RSRP is the time for Ll-RSRP measurement for Rx beam refinement; TRRc_processingis the RRC processing delay; At 204, when UE receives TCI state indication (for example beam index 6 in the example described above)/TCI switch command through PDSCH (MAC CE or RRC) or PDCCH (DCI command), UE may start procedure of beam acquisition (beam index 6 in the example described above) and measures the CSI on the next available CSI resources which may be SSB/CSI-RS and perform CSI report evaluation. Based on the beam reported instance (time), UE sends the CSI report as described below, If the beam report is sent less than [X] ms ago, UE shall send valid CSI report as shown in Fig. 3. If the beam report is sent more than predetermined time ago, as shown in Fig. 4, if TCI state is not known to UE, UE should start performing the beam acquisition procedure. When CSI reporting resources are available, UE shall send partially valid or invalid CSI report. Partially valid or invalid CSI report may mean any value(s) which is not used in the normal (i.e. valid CSI report) CSI reporting, or any value(s) which is defined for the case where the UE cannot get the valid (i.e. appropriate) CSI. It is also possible that the invalid CSI report and the partially valid CSI report are the same or different from each other. Existing CSI (Ll-RSRP) reporting table(s) of [3] may be used for indicating invalid and partially valid CSI reporting to gNB. As shown in Fig. 5, if TCI state is known, UE shall send valid CSI report. Second embodiment: As shown in Fig. 6, another embodiment (second embodiment) describes UE behaviour w.r.t CSI reporting when beam report is sent more than predetermined time ago, to solve problem statement. The flow of the UE behaviour is outlined below. At 601, RRC reconfiguration for beam management is initiated. At 602, Beam measurement report by UE is provided. At 603, TCI state indication by gNB is provided. At 604, TCI switching by UE is performed. As part of this UE have to perform TCI state acquisition, TCI state known status update, CSI computation and evaluation and CSI reporting based on applicability; wherein If beam report is sent less than predetermined time ago, UE shall send valid CSI report and if beam report is sent more than predetermined time ago and if UE cannot acquire the beam (i.e. beam is unknown or not known), UE sends invalid (or partially valid) CSI report till UE acquires TCI state (beam). Upon TCI state acquisition (i.e. beam is known now) UE sends valid CSI report. If beam is known, UE shall send valid CSI report on the first CSI reporting instance and UE switch to new TCI state. In detail, at 601, gNB configures UE with measurement resources and measurement reporting resources. At 602, based on the measurement resources and measurement reporting configuration, UE measures and report beam measurements to gNB. At 603, based on the beam measurement report, gNB may send a TCI state indication if any stronger TCI state is found in beam report. At 604, when UE receives TCI state indication through PDSCH (MAC CE or RRC) or PDCCH (DCI command), the UE may start procedure of beam acquisition, UE may update TCI state known status, measures the CSI and perform the CSI report evaluation. Based on the beam report instance (time), UE sends the CSI report as described below. If the beam report is sent less than [X] ms ago, UE shall send valid CSI report. If the beam report is sent more than [X] ms ago, as shown in Fig. 7, if TCI state is not known to UE, UE should start performing the beam acquisition procedure. When CSI reporting resources are available, UE shall send partially valid or invalid CSI report till UE completes beam acquisition procedure. Upon TCI state acquisition, UE should send valid CSI report. Partially valid or invalid CSI report may mean any value(s) which is not used in the normal (i.e. valid CSI report) CSI reporting, or any value(s) which is defined for the case where the UE cannot get the valid (i.e. appropriate) CSI. It is also possible that the invalid CSI report and the partially valid CSI report are the same or different from each other. Existing CSI (Ll- RSRP) reporting table(s) of [3] may be used for indicating invalid and partially valid CSI report to gNB. Alternate solution for this problem as shown in Fig. 8 is, between first instance of (partially valid/invalid) CSI report and till UE completes beam acquisition and sends valid CSI report, UE shall not send any CSI reports. That means even though gNB configures a UE with CSI reporting resources, since first CSI report is partially valid or invalid CSI report, subsequent reports till the valid CSI report, are also partially valid or invalid CSI reports, it means that gNB is not getting any useful information from the UE. Hence it is beneficial to skip the CSI reports in between the partially valid/invalid CSI reports to valid CSI report even when UE has CSI reporting resources configured. Time till which UE does not send CSI reports can be configured. As shown in Fig. 9, if TCI state is known, UE shall send valid CSI report on first instance of CSI reporting after TCI switch command. TCI switch delay should be updated to TCI switch delay (known). UE expected to receive PDCCH/PDSCH on new TCI state at the end of TCI state switch delay corresponding to TCI state known. UE switches to new TCI state and subsequent PDSCH/PDCCH is received on the new TCI state. Third embodiment: Another embodiment (third embodiment) of the present invention describes CSI evaluation and CSI classification at UE to solve the problem statement. Outline of the solution is described below as well as illustrated in Fig. 10. Entire flow of the solution is divided into four steps and outline of the solution is described below At 1001, RRC reconfiguration for beam management is initiated. At 1002, Beam measurement report by UE is provided. At 1003, TCI state indication by gNB is provided. At 1004, TCI switching by UE is performed. As part of this UE have to perform, TCI state acquisition, TCI state known status update, CSI computation and evaluation; wherein if UE cannot acquire the beam (i.e. beam is unknown at UE) UE CSI report is classified into partially valid/invalid CSI report; UE also has to send CSI report based on the applicability, upon which the UE switch to new TCI state In detail, at 1001, gNB configures UE with measurement resources and measurement reporting resources. At 1002, based on the measurement resources and measurement reporting configuration UE measures and report beam measurements to gNB. At 1003, based on the beam measurement report, gNB may send a TCI state indication if any stronger TCI state is found in beam report. At 1004, when UE receives TCI state indication through PDSCH (MAC CE or RRC) or PDCCH (DCI command), the UE starts procedure of beam acquisition, updates TCI state known status, measures the CSI and perform the CSI report evaluation as described below. TCI state known status update at UE upon reception of TCI state indication: Upon reception of TCI state indication/TCI state switch command, UE may start acquiring target beam and may update the TCI state known status as described below. • If the TCI state is detectable, then the beam is considered known and UE may update TCI state known status to TCI state known. • If the TCI state is not detectable, then the beam is considered unknown and UE may update TCI state known status to TCI state unknown. Partially Valid CSI report: If UE can detect and measure the beam and measured Ll-RSRP value satisfies following criteria of Y < | CSI Report latest -CSI Report_prev \ < Z dBm. Where CSI Report latest is the latest measured CSI report after receiving the TCI state indication and CSI Report_prev is the last reported CSI report value before receiving the TCI switch command. Invalid CSI report: If UE can't detect the beam, it reports an invalid Ll-RSRP. Y and Z values in the above method are configurable. Upon performing the CSI report evaluation, UE reports the CSI based on the evaluation result. At each CSI reporting instance, UE should report based on the reporting configuration. Which may involve target TCI state and other TCI states according to reporting configuration. The reported value is determined as described below Ll-RSRP reporting: Ll-RSRP report may be part of CSI report. For Ll-RSRP reporting, if the higher layer parameter nrofReportedRS in CSI-ReportConfigis configured to be one, the reported Ll-RSRP value is defined by a 7-bit value in the range [-140, -44] dBm with IdB step size, if the higher layer parameter nrofReportedRS is configured to be larger than one, or if the higher layer parameter groupBasedBeamReporting is configured as 'enabled', the UE shall use differential Ll-RSRP based reporting, where the largest measured value of Ll-RSRP is quantized to a 7- bit value in the range [-140, -44] dBm with IdB step size, and the differential Ll-RSRP is quantized to a 4-bit value. The differential Ll-RSRP value is computed with 2 dB step size with a reference to the largest measured Ll-RSRP value which is part of the same Ll-RSRP reporting instance. The mapping between the reported Ll-RSRP value and the measured quantity is described in Table 1 and Table 2, which are described in TS 38.133, [3]. Signaling design of partially valid/invalid CSI report: CSI report can be signaled using implicit or explicit signaling. Implicit signaling implies using existing Ll-RSRP table, UE indicates the type of CSI report to gNB. In table 1, RSRPO to RSRP15 and RSRP114 to RSRP126 are not used for Ll-RSRP reporting, as the reporting range of Ll-RSRP is [-140 to -44] dBm. In the table 1, these values are indicated as not valid. Implicit Method: In this method, the unused/Not valid values of LI SS-RSRP /CSI-RSRP quantity of table 1 are used to convey more accurate CSI type information to gNB. To report partially valid CSI, UE may use any unused Ll-RSRP values ("Not valid") of Table 1 [3]. For example UE may use any value in the range from RSRPO to RSRP15. It just informs gNB that CSI is partially valid. It won't give any information on signal strength. To report invalid CSI, UE may use any unused Ll-RSRP values ("Not valid") of Table 1 [3]. For example UE may use any value in the range from RSRP114 to RSRP126. It just informs gNB that CSI is invalid. It won't give any information on signal strength. a. Upon determining the type of CSI and CSI value to be reported, UE reports CSI report based on the applicability b. When UE is ready with Rx spatial filter direction to receive the beam, UE switches to new TCI state. Upon UE switch to new TCI state, subsequent PDSCH/PDCCH is received on the new TCI state Reported value DIFFRSRPO DIFFRSRP1 DIFFRSRP2 DIFFRSRP3 DIFFRSRP4 DIFFRSRP5 DIFFRSRP6 DIFFRSRP7 DIFFRSRP8 DIFFRSRP9 DIFFRSRP10 DIFFRSRP11 DIFFRSRP12 DIFFRSRP13 DIFFRSRP14 DIFFRSRP15 Measured quantity value(difference in measured RSRP from strongest RSRP) 0>ARSRP>-2 -2>ARSRP>-4 -4>ARSRP>-6 -6>ARSRP>-8 -8>ARSRP>-10 -10>ARSRP>-12 -12>ARSRP>-14 -14>ARSRP>-16 -16>ARSRP>-18 -18>ARSRP>-20 -20>ARSRP>-22 -22>ARSRP>-24 -24>ARSRP>-26 -26>ARSRP>-28 -28>ARSRP>-30 -30>ARSRP Unit dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB Differential SS-RSRP and CSI-RSRP measurement report mapping Table 2: SS-RSRP and CSI-RSRP measurement report mapping Fourth embodiment: Another embodiment (fourth embodiment) of the present invention describes the gNB behavior for TCI scheduling and CSI report handling. Outline of the solution is described below as well as illustrated in Fig. 11. Entire flow of the solution is divided into four steps and outlined below. At 1101, RRC reconfiguration for beam management is initiated. At 1102, Beam measurement report by UE is provided At 1103, TCI state indication by gNB is provided At 1104, TCI switching is performed, which comprises of TCI state acquisition at UE, TCI state (beam) known status update at UE (if UE can acquire the beam, beam is known; if UE Reported value RSRP_0 RSRP_1 RSRP_2 RSRP_3 RSRP_4 RSRP_5 RSRP_6 RSRP_7 RSRP_8 RSRP_9 RSRP_10 RSRP_11 RSRP_12 RSRPJ.3 RSRP_14 RSRP_15 RSRP_16 RSRP_17 RSRPJ.8 RSRP_111 RSRP_112 RSRP_113 RSRP_114 RSRPJ.15 RSRP_116 RSRP_117 RSRP_118 RSRP_119 RSRPJ.20 RSRP_121 RSRP_122 RSRP_123 RSRP_124 RSRPJ.25 RSRP_126 RSRP_127 (Note) Measured quantity value(L3 SS-RSRP) SS-RSRP<-156 -156< SS-RSRP<-155 -155< SS-RSRP<-154 -154< SS-RSRP<-153 -153< SS-RSRP<-152 -152< SS-RSRP<-151 -151< SS-RSRP<-150 -150< SS-RSRP<-149 -149< SS-RSRP<-148 -148< SS-RSRP<-147 -147< SS-RSRP<-146 -146< SS-RSRP<-145 -145< SS-RSRP<-144 -144< SS-RSRP<-143 -143< SS-RSRP<-142 -142< SS-RSRP<-141 -141< SS-RSRP<-140 -140< SS-RSRP<-139 -139< SS-RSRP<-138 -46< SS-RSRP<-45 -45< SS-RSRP<-44 -44< SS-RSRP<-43 -43< SS-RSRP<-42 -42< SS-RSRP<-41 -41< SS-RSRP<-40 -40< SS-RSRP<-39 -39< SS-RSRP<-38 -38< SS-RSRP<-37 -37< SS-RSRP<-36 -36< SS-RSRP<-35 -35< SS-RSRP<-34 -34< SS-RSRP<-33 -33< SS-RSRP<-32 -32< SS-RSRP<-31 -31< SS-RSRP Infinity Measured quantity value(Ll SSRSRP and CSI-RSRP) Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid Not valid RSRP<-140 -140