A method performed by a terminal in a wireless communication system, the method comprising: transmitting (S1510, S105), to a base station, information related to a beam switching timing of the terminal which indicates the beam switch timing from a set of beam switch timing candidates of 224 symbols and 336 symbols; receiving (S1520, S1 15), from the base station, downlink control information, DCI, including information for a channel state information, CSI, triggering state associated with a CSI report configuration and a CSI-reference signal, CSI-RS, resource configuration; and receiving, from the base station, a CSI-RS with applying, a first quasi co-location, QCL, assumption based on a transmission configuration indicator, TCI, state for the CSI-RS resource, based on a scheduling offset between a last symbol of a physical downlink control channel, PDCCH, carrying the DCI and a first symbol of the CSI-RS resource in a non-zero power-CSI-RS-resource set, NZP-CSI-RS-ResourceSet configured without a higher layer parameter tracking reference signal-information, trs-info, being equal to or larger than a threshold, or a second QCL assumption based on another downlink signal, based on i) the scheduling offset being smaller than the threshold, and ii) there being the another downlink signal being indicated by a TCI state in a same symbol as the CSI-RS, wherein the threshold is 48 symbols for a value equal to or lower than 3 that is a value of an index μ corresponding to a subcarrier spacing value supported by the terminal equal to or lower than 120 kHz, wherein the threshold is a threshold value having a value higher than 48 symbols for a value higher than the value 3 of the index μ corresponding to a subcarrier spacing value supported by the terminal higher than 120 kHz, and wherein the threshold value is 96 symbols. transmitting (S1510, S105), to a base station, information related to a beam switching timing of the terminal which indicates the beam switch timing from a set of beam switch timing candidates of 224 symbols and 336 symbols; receiving (S1520, S1 15), from the base station, downlink control information, DCI, including information for a channel state information, CSI, triggering state associated with a CSI report configuration and a CSI-reference signal, CSI-RS, resource configuration; and receiving, from the base station, a CSI-RS with applying, a first quasi co-location, QCL, assumption based on a transmission configuration indicator, TCI, state for the CSI-RS resource, based on a scheduling offset between a last symbol of a physical downlink control channel, PDCCH, carrying the DCI and a first symbol of the CSI-RS resource in a non-zero power-CSI-RS-resource set, NZP-CSI-RS-ResourceSet configured without a higher layer parameter tracking reference signal-information, trs-info, being equal to or larger than a threshold, or a second QCL assumption based on another downlink signal, based on i) the scheduling offset being smaller than the threshold, and ii) there being the another downlink signal being indicated by a TCI state in a same symbol as the CSI-RS, a first quasi co-location, QCL, assumption based on a transmission configuration indicator, TCI, state for the CSI-RS resource, based on a scheduling offset between a last symbol of a physical downlink control channel, PDCCH, carrying the DCI and a first symbol of the CSI-RS resource in a non-zero power-CSI-RS-resource set, NZP-CSI-RS-ResourceSet configured without a higher layer parameter tracking reference signal-information, trs-info, being equal to or larger than a threshold, or a second QCL assumption based on another downlink signal, based on i) the scheduling offset being smaller than the threshold, and ii) there being the another downlink signal being indicated by a TCI state in a same symbol as the CSI-RS, wherein the threshold is 48 symbols for a value equal to or lower than 3 that is a value of an index μ corresponding to a subcarrier spacing value supported by the terminal equal to or lower than 120 kHz, wherein the threshold is a threshold value having a value higher than 48 symbols for a value higher than the value 3 of the index μ corresponding to a subcarrier spacing value supported by the terminal higher than 120 kHz, and wherein the threshold value is 96 symbols.