The present disclosure provides a method performed in UE, comprising: receiving from a base station a QoS flow configuration contained in an RRC message, wherein the QoS flow configuration comprises a QoS flow identifier and at least one of the following identifiers: a PDU session identifier associated with a QoS flow indicated by the QoS flow identifier, a DRB identifier associated with the QoS flow indicated by the QoS flow identifier, an SDAP identifier associated with the QoS flow indicated by the QoS flow identifier, and an identifier of a default DRB associated with the QoS flow indicated by the QoS flow identifier; determining whether the QoS flow identifier is a part of a current UE configuration; and if the QoS flow identifier is not a part of the current UE configuration, adding, in art RRC layer, the QoS flow indicated by the QoS flow identifier, and indicating to an upper layer the addition of the QoS flow through the QoS flow identifier and the at least one associated identifier; if the QoS flow identifier is a part of the current UE configuration, modifying, in the RRC layer, the QoS flow indicated by the QoS flow identifier, and indicating to the upper layer the modification of the QoS flow through the QoS flow identifier and the at least one associated identifier that are received. The present disclosure further provides a corresponding method performed in a base station, as well as corresponding UE and a corresponding base station.