Patent ID: 11902824
Assignee: SHARP KABUSHIKI KAISHA
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A terminal apparatus for communicating with a base station apparatus, the terminal apparatus comprising:
reception circuitry configured to receive a Radio Resource Control (RRC) reconfiguration message including a Data Radio Bearer (DRB) configuration from the base station apparatus; and
processing circuitry, wherein
the processing circuitry is configured to
determine whether a DRB identity included in the DRB configuration is not part of a current configuration of the terminal apparatus,
determine whether a Service Data Adaptation Protocol (SDAP) configuration is included in the DRB configuration,
determine whether an SDAP entity corresponding to a Protocol Data Unit (PDU) session indicated by a PDU session information element included in the SDAP configuration does not exist after determining whether the SDAP configuration is included in the DRB configuration,
establish the SDAP entity based on determination that the DRB identity included in the DRB configuration is not part of the current configuration of the terminal apparatus, the SDAP configuration is included in the DRB configuration, and the SDAP entity corresponding to the PDU session indicated by the PDU session information element included in the SDAP configuration does not exist after determining whether the SDAP configuration is included in the DRB configuration,
determine whether the SDAP entity corresponding to the PDU session indicated by the PDU session information element included in the SDAP configuration does not exist before receiving the RRC reconfiguration message, and
indicate establishment of a user-plane resource for the PDU session to an upper layer based on determination that the DRB identity included in the DRB configuration is not part of the current configuration of the terminal apparatus, the SDAP configuration is included in the DRB configuration, the SDAP entity corresponding to the PDU session indicated by the PDU session information element included in the SDAP configuration does not exist after determining whether the SDAP configuration is included in the DRB configuration, and that the SDAP entity corresponding to the PDU session indicated by the PDU session information element does not exist before receiving the RRC reconfiguration message.