TERMINAL APPARATUS, BASE STATION APPARATUS, AND METHOD THEREFOR Russian patent published in 2021 - IPC H04W72/04 H04W76/10 H04W80/08 

FIELD: communication.

SUBSTANCE: invention relates to a terminal apparatus, a base station apparatus, and a communication method. The terminal apparatus includes: a receiving unit configured to receive an RRC configuration change message, including a radio channel configuration, from the base station apparatus; and a processing unit configured to issue a higher level notification that the user plane resource for the PDU session was configured when the DRB for the PDU session did not exist prior to receiving the RRC configuration change message if the value of the radio channel identifier included in the radio channel configuration does not exist in the configuration and if the radio channel configuration includes the SDAP configuration.

EFFECT: increase in the efficiency of communication between the terminal apparatus and the base station.

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