Patent ID: 11910464
Assignee: SHARP KABUSHIKI KAISHA
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. A base station apparatus for communicating with a terminal apparatus, the base station apparatus comprising:
generation circuitry configured to generate a Radio Resource Control (RRC) connection reconfiguration message including, as a Packet Data Convergence Protocol (PDCP) entity configuration for a Data Radio Bearer (DRB) associated with a DRB identity, either a New Radio (NR) PDCP entity configuration or an Evolved Universal Terrestrial Radio Access (E-UTRA) PDCP entity configuration; and
a transmitter configured to transmit the RRC connection reconfiguration message to the terminal apparatus, wherein
in a case where the DRB identity is not currently configured in the terminal apparatus, there are the following possible cases: i) the E-UTRA PDCP entity configuration is included in a DRB configuration included in the RRC connection reconfiguration message and ii) the E-UTRA PDCP entity configuration is not included in the DRB configuration, and
the RRC connection reconfiguration message is a message that causes the terminal apparatus to:
notify a higher layer of information indicating that the DRB is established and an EPS bearer identity of the DRB established, based on a determination that both of the following conditions hold: a) the DRB identity is not currently configured in the terminal apparatus, and b) the E-UTRA PDCP entity configuration for the DRB is included in the DRB configuration.