Abstract: A terminal apparatus for communicating with a second terminal apparatus via a first terminal apparatus. The third terminal apparatus receives a sidelink transmission from the second terminal apparatus to the first terminal apparatus, measures a sidelink Reference Signal Received Power (SL-RSRP) from the received sidelink transmission, and determines whether the SL-RSRP is equal to or greater than a threshold, and notifies a higher layer that the second terminal apparatus is in proximity in a case that the SL-RSRP is determined to be equal to or greater than the threshold, and does not notify the higher layer that the second terminal apparatus is in proximity in a case that the SL-RSRP is not determined to be equal to or greater than the threshold.

Abstract: A MAC entity of a terminal apparatus provides an indication indicating a beam failure in the PSCell to an RRC entity of the terminal apparatus, in a case that a value of BFI_COUNTER of a PSCell is equal to or greater than a first parameter and an SCG is deactivated, based on a determination of whether the beam failure in the PSCell has been indicated to the RRC entity since a last reconfiguration of a BFD-RS of the PSCell by the RRC entity, and a determination that the beam failure in the PSCell has not been indicated to the RRC entity since the last reconfiguration of the BFD-RS of the PSCell by the RRC entity, and the first parameter is a threshold configured by a base station apparatus and used in beam failure detection.

Abstract: A phase difference film formed of a resin containing a polymer having crystallizability, wherein: a coefficient of variation CV(Re) of an in-plane retardation of the phase difference film at a measurement wavelength of 590 nm is 1.0% or less.

Abstract: A MAC entity of a terminal apparatus determines whether a TAT associated with a TAG including a PSCell of an SCG has expired, and provides a notification to an RRC entity of the terminal apparatus, the notification indicating that a random access procedure is needed for activation of the SCG based on the determination that the TAT associated with the TAG including the PSCell has expired.

Abstract: A processing unit of a terminal apparatus communicates with a base station apparatus using an MCG and an SCG, and determines whether to perform radio link monitoring and/or beam failure detection in the terminal apparatus based on whether information indicating whether to perform radio link monitoring and/or beam failure detection is included in an SCG deactivation command transmitted from the previous base station apparatus, and the terminal apparatus determines whether to perform radio link monitoring and/or beam failure detection based on a determination of whether to perform radio link monitoring and/or beam failure detection.

Abstract: A terminal apparatus determines whether to delete all entries included in an entry list held by the terminal apparatus in a case that an RRC connection reconfiguration is performed, deletes all entries included in the entry list in a case that it is determined to delete all entries included in the entry list, and does not delete one or more entries included in the entry list in a case that it is determined not to delete all entries included in the entry list.

Abstract: In a case of determining that an SCG is to enter a deactivated state, a processing unit of a terminal apparatus deactivates the SCG and suspends configured uplink grants of grant type 1 associated with a PSCell of the SCG, and in a case of determining that the SCG is to enter an activated state, the processing unit activates the SCG and (re)initializes the suspended configured uplink grants of grant type 1 associated with the PSCell of the SCG.

Abstract: In a case that a processing unit of a terminal apparatus determines that an SCG is to enter an activated state, the processing unit activates the SCG based on the signalling, and determines which BWP is used to perform RLM, based on the fact that the signalling communicated from the base station apparatus includes or does not include information indicating a BWP to be activated in the activated state of the SCG.

Abstract: A processing unit of a terminal apparatus communicates with a base station apparatus using an MCG and an SCG, determines whether signalling notifying that the SCG is to be in a deactivated state and transmitted from the base station includes information indicating that beam failure detection is to be performed, and in a case of determining that the signalling includes no information indicating that the beam failure detection is to be performed in the deactivated state of the SCG, the processing unit configures BFI_COUNTER of a PSCell of the deactivated SCG to 0.

Abstract: A processing unit of a terminal apparatus communicates with a base station apparatus using an MCG and an SCG, determines whether to perform beam failure detection in the terminal apparatus based on whether information indicating whether to perform beam failure detection is included in an SCG deactivation command transmitted from the previous base station apparatus, and the terminal apparatus determines whether to perform beam failure detection based on a determination of whether to perform beam failure detection.

Abstract: A processing unit of a terminal apparatus communicates with a base station apparatus using an MCG and an SCG, and determines whether signalling transmitted from the base station apparatus and notifying that the SCG is to be in a deactivated state includes information indicating that radio link monitoring is to be performed. In a case of determining that the signalling includes no information indicating that the radio link monitoring is to be performed in the deactivated state of the SCG, the processing unit stops a timer (T310) for the PSCell of the deactivated SCG for the terminal apparatus. The timer (T310) is started in a case that a predetermined number (N310) of consecutive out-of-sync indications notified from a PHY entity of the terminal apparatus are received in the PSCell and is stopped in a case that a predetermined number (N311) of in-sync indications are received from the PHY entity of the terminal apparatus in the PSCell.

Abstract: A terminal apparatus for communicating with a base station apparatus using an MCG and an SCG determines (a) whether uplink data has been generated that is to be transmitted on a DRB associated with an RLC entity of the SCG and (b) whether the SCG is deactivated, and in a case of determining that uplink data has been generated that is to be transmitted on the DRB associated with the RLC entity of the SCG and that the SCG is deactivated, the terminal apparatus notifies the base station apparatus via SRB1 that uplink data has been generated that is to be transmitted on the DRB associated with the RLC entity of the SCG.

Abstract: A terminal apparatus determines whether a candidate special cell (SpCell) associated with a conditional reconfiguration information element of an entry included in an entry list is identical to a special cell (SpCell) currently configured for the terminal apparatus, and does not cause an execution condition to be evaluated, the execution condition being included in the entry including the conditional reconfiguration information element of which the associated candidate SpCell is identical to the SpCell currently configured for the terminal apparatus.

Abstract: A terminal apparatus determines whether information (first information) indicating whether a state of a secondary cell group is to be changed based on scg-State is included in the RRC signaling, in a case that the first information is not included in the RRC signaling, the state of the secondary cell group is changed based on whether the scg-State is included in the RRC signaling, and in a case that the first information is included in the RRC signaling, the state of the secondary cell group is not changed based on whether the scg-State is included in the RRC signaling.

Abstract: A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive, from the base station apparatus, a Radio Resource Control (RRC) message indicating handover from NR to a second Radio Access Technology (RAT), and a processing unit configured to perform the handover in accordance with the RRC message. The processing unit releases a Packet Data Convergence Protocol (PDCP) entity and a Service Data Adaptation Protocol (SDAP) entity related to a radio bearer for a Multicast Broadcast Service (MBS) configured for the terminal apparatus, based at least on that the handover has completed, and in a case that the handover fails, the processing unit does not release the PDCP entity and the SDAP entity related to the radio bearer for the MBS configured for the terminal apparatus.

Abstract: A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive a Radio Resource Control (RRC) release message from the base station apparatus, and a processing unit. The processing unit establishes a radio bearer for a Multicast Broadcast service (MBS) for delivery mode 1. The processing unit determines whether or not a suspend configuration parameter is included in the RRC release message, and in a case that the processing unit determines that the suspend configuration parameter is included, the processing unit suspends the radio bearer for the MBS for the delivery mode 1, and in a case that the processing unit determines that the suspend configuration parameter is not included, the processing unit does not suspend the radio bearer for the MBS for the delivery mode 1. The suspend configuration parameter is a parameter indicating a configuration for an RRC_INACTIVE state.

Abstract: A terminal apparatus includes a receiver configured to receive a first RRC message and/or a second RRC message from the base station apparatus, and a processing unit. In a case that an MRB of a first type is established with the first RRC message, and all of radio bearers are to be released, the processing unit releases the MRB of the first type. In a case that the MRB of a second type is established with the second RRC message, and all of the radio bearers are to be released, the processing unit does not release the MRB of the second type.

Abstract: A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive an RRC reconfiguration message from the base station apparatus, and a processing unit. The processing unit resumes an MRB, based at least on that the RRC reconfiguration message is a first RRC reconfiguration message received after successful completion of an RRC reestablishment procedure.

Abstract: A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive a Radio Resource Control (RRC) reconfiguration message including a first parameter from the base station apparatus, and a processing unit. The processing unit performs first processing on each session not to be added with the first parameter among the sessions already configured for the terminal apparatus, based at least on that a parameter indicating a full configuration is included in the RRC reconfiguration message. The first parameter is an MRB configuration list parameter. The first processing includes indicating to an upper layer that a user plane resource for each session not to be added has been released.

Abstract: A first terminal apparatus for performing sidelink communication receives a first message from a second terminal apparatus, determines information based on a Reference Signal Received Power (RSRP) of the first message received from the second terminal apparatus, and transmits a second message including the information to a third terminal apparatus, wherein the first message and the second message are messages used to select a terminal apparatus being responsible to forward a sidelink transmission of the second terminal apparatus to the third terminal apparatus.