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

Claim 2:
3. A communication method used by a terminal apparatus for communicating with a base station apparatus, the communication method comprising:
receiving a Radio Resource Control (RRC) reconfiguration message including a Data Radio Bearer (DRB) configuration from the base station apparatus;
determining whether a DRB identity included in the DRB configuration is not part of a current configuration of the terminal apparatus,
determining whether a Service Data Adaptation Protocol (SDAP) configuration is included in the DRB configuration,
determining 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,
establishing the SDAP entity based on determination that the-a 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;
determining whether the SDAP entity corresponding to the PDU session indicated by the PDU information element included in the SDAP configuration does not exist before receiving the RRC reconfiguration message; and
indicating 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 configuration does not exist, and 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.