Abstract: A terminal apparatus for communicating with a base station apparatus, the terminal apparatus including: a receiver configured to receive, from the base station apparatus, a Radio Resource Control (RRC) reconfiguration message including a radio bearer configuration information element; and a processing unit configured to, in a case that a radio bearer identity included in the radio bearer configuration information element is not part of a configuration of the terminal apparatus and that the radio bearer configuration information element includes a Service Data Adaptation Protocol (SDAP) configuration information element and that a Protocol Data Unit (PDU) session information element included in the SDAP configuration information element is not part of the configuration of the terminal apparatus, indicate to upper layers that a user-plane resource is configured for a PDU session corresponding to a value of the PDU session information element.

Abstract: A terminal apparatus includes: a measurement unit configured to measure a first radio link quality based on at least part of a plurality of reference signals and a second radio link quality based on at least part of the plurality of reference signals in a certain serving cell; and a processing unit configured to trigger a report in a case that the first radio link quality and the second radio link quality satisfy a predetermined condition.

Abstract: The present invention includes a receiver configured to receive first information, the first information including information for configuring whether transform precoding for a physical uplink shared channel is enabled, and a transmitter configured to transmit information indicating a first power headroom level for the physical uplink shared channel with the transform precoding enabled and information indicating a second power headroom level for the physical uplink shared channel with the transform precoding not enabled.

Abstract: A terminal apparatus for communicating with one or more base station apparatuses, the terminal apparatus including: a receiver configured to receive an RRC reconfiguration message including a DRB configuration from the one or more base station apparatuses, the DRB configuration including a DRB identity and an EPS bearer identity; and a processing unit configured to associate a DRB established with the EPS identity in a case that the DRB identity is not part of a current configuration of the terminal apparatus, and the DRB was configured for the EPS bearer identity.

Abstract: A terminal apparatus is provided. The terminal apparatus includes a receiver configured to receive a first message from a base station apparatus, and a processing unit configured to modify first data radio bearer configuration configured for the terminal apparatus, based on the first message. A first PDCP entity is reconfigured as a packet data convergence protocol (PDCP) entity for the first data radio bearer. A first secrecy key for a source and a second secrecy key for a target are configured for the first PDCP entity as secrecy keys for the first data radio bearer. In a case that the first message includes first information and second information, the second secrecy key for the target of the first PDCP entity is configured based on the second information. In a case that the first message does not include the first information, the first secrecy key for the source is applied to the second secrecy key for the target of the first PDCP entity.

Abstract: A terminal apparatus for communicating with a base station apparatus is provided. The terminal apparatus includes a receiver configured to receive a first message from the base station apparatus, and a processing unit configured to establish a second packet data convergence protocol (PDCP) entity with a configuration identical to a configuration of a first PDCP entity for a first signaling radio bearer, based on a fact that a first configuration is configured. The first configuration is configured based on the first message.

Abstract: A terminal apparatus for communicating with a base station apparatus is provided. The terminal apparatus includes a receiver configured to receive a Radio Resource Control (RRC) reconfiguration message including a parameter related to a first configuration from the base station apparatus, and a processing unit configured to perform configuration in accordance with the RRC reconfiguration message received. In a case that a first timer of an RRC protocol expires, a radio link failure of a source primary cell is not detected, and configuration related to Dual Active Protocol Stack (DAPS) handover is performed for the terminal apparatus, the processing unit reconfigures all of state variables configured for a Radio Link Control (RLC) entity of a Signaling Radio Bearer (SRB) in the source primary cell to respective initial values, resumes the SRB suspended in the source primary cell, and transmits an RRC message for notifying the base station apparatus that the DAPS handover has failed.

Abstract: A terminal apparatus for communicating with a base station apparatus is provided. The terminal apparatus includes a receiver configured to receive, from the base station apparatus, a Radio Resource Control (RRC) reconfiguration message including a parameter related to first configuration, and a processing unit configured to perform configuration in accordance with the RRC reconfiguration message received. In a case that a first timer of an RRC protocol expires, a radio link failure of a source primary cell is not detected, and configuration related to Dual Active Protocol Stack (DAPS) handover is performed for the terminal apparatus, the processing unit stops all of timers configured for a Radio Link Control (RLC) entity of a Signaling Radio Bearer (SRB) in the source primary cell, resumes the SRB suspended in the source primary cell, and transmits an RRC message for notifying the base station apparatus that the DAPS handover has failed.

Abstract: A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive, from the base station apparatus, an RRC reconfiguration message including a first configuration related to a radio bearer to which a Dual Active Protocol Stack (DAPS) is applied, and a processing unit configured to perform configuration in accordance with the RRC reconfiguration message. In a case that a first timer expires, that no radio link failure is detected in a source primary cell, and that the first configuration is performed on any radio bearer, the processing units releases a configuration for a target primary cell, resets MAC for the target primary cell, discards all data of a PDCP entity for a SRB of the source primary cell, discards all data of an RLC entity for the SRB of the source primary cell, resumes the SRB suspended in the source primary cell, and transmits, to the base station apparatus, an RRC message for notifying that a DAPS handover is unsuccessful.

Abstract: A terminal apparatus transmits one random access preamble in multiple time sections, and changes a transmit beam to be used to transmit the one random access preamble in one of the multiple time sections or each of the multiple time sections, and monitors a random access response to the one random access preamble. The random access response includes first information for identifying any one of the multiple time sections.

Abstract: A terminal apparatus includes: a reception unit configured to receive an MIB that configures a first CORESET, receive an SIB1 that configures a second CORESET, receive first information that configures an initial UL BWP and second information that configures an additional UL BWP, and receive a first DCI format that schedules a PUSCH in a common search space; and a transmission unit configured to specify a set of allocated resource blocks based on a first field included in a first DCI format and transmit a PUSCH in an active UL BWP, the active UL BWP being either the initial UL BWP or the additional UL BWP, the first value indicated by a first field is provided based on the size of the initial UL BWP, a first start position that is a start position of a set of allocated resource blocks, and the number of first resource blocks continuously allocated, and the common search space is used for a random access procedure.

Abstract: A technology for a terminal apparatus, a base station apparatus, a communication method, and an integrated circuit which enable efficient communication with reduced complexity of protocol processing is provided. A terminal apparatus for communicating with a base station apparatus receives an RRC connection reconfiguration request message including a Data Radio Bearer (DRB) configuration from the base station apparatus, the DRB configuration includes an SDAP configuration, the SDAP configuration includes information indicating whether an SDAP function is to be enabled or disabled, in a case that the SDAP function is enabled, the SDAP function is configured, and in a case that the SDAP function is disabled, the SDAP function is not configured.

Abstract: A terminal apparatus in communication with a base station apparatus includes a receiver configured to receive, from the base station apparatus, a message related to Radio Resource Control (RRC) connection reconfiguration, and a processing unit. The processing unit determines, based on information included in the message related to the RRC connection reconfiguration, a DRB to which a DAPS is to be applied and a DRB to which the DAPS is not to be applied, and associates, with a target primary cell, an RLC entity and a DTCH logical channel for the DRB to which the DAPS is not to be applied.

Abstract: A terminal apparatus includes a receiver configured to receive, from the base station apparatus, an RRC reconfiguration message including a DRB configuration, and a processing unit, wherein the processing unit performs, based on inclusion of a first parameter in the DRB configuration, configuration of a PDCP entity of a DRB corresponding to the DRB configuration, the configuration being related to a DAPS handover.

Abstract: A terminal apparatus includes: a receiver configured to receive a plurality of reference signals from a base station apparatus in a cell; a measurement unit configured to measure at least one reference signal received power (RSRP) of at least one of the plurality of reference signals; and a calculating unit configured to average N highest ones of the at least one RSRP measured to obtain a reference RSRP of the cell.

Abstract: A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive, from the base station apparatus, a message indicating mobility from a first Radio Access Technology (RAT) to a second RAT, and a processing unit configured to attempt to select a cell. A requirement for the processing unit to attempt to select a cell in the second RAT in a case that processing of the mobility in accordance with the message fails is that establishment of a connection to the second RAT is not successful and first information is included in the message.

Abstract: Provided is a terminal apparatus, wherein based on detection of a request, for a PDCP SDU received from an upper layer, the terminal apparatus performs header compression of the PDCP SDU by using second header compression processing, performing ciphering by using a second ciphering algorithm, a second ciphering key, and a COUNT value, performs integrity protection of the PDCP SDU by using a second integrity protection algorithm, a second integrity protection key, and the COUNT value, and submits a PDCP PDU created, to the second RLC entity.

Abstract: A terminal apparatus for communicating with a base station apparatus receives an RRC connection reconfiguration request message including a Data Radio Bearer (DRB) configuration from the base station apparatus. The DRB configuration includes a DRB identity and a PDCP entity configuration corresponding to the DRB identity. PDCP entity configuration information includes one of a PDCP entity configuration for E-UTRA and a PDCP entity configuration for NR. A PDCP entity is established in accordance with the PDCP entity configuration information.

Abstract: A terminal apparatus includes a receiver configured to receive a radio resource control (RRC) reconfiguration message from a base station apparatus, and a controller configured to configure a parameter based on the parameter included in the RRC reconfiguration message. The parameter includes at least identity information of a target cell and a configuration of a subcarrier spacing, and the configuration of the subcarrier spacing is configured for each of the target cells.

Abstract: To provide a technique related to a terminal apparatus, a method, and an integrated circuit for efficiently performing communication between a base station apparatus and the terminal apparatus by correctly managing QoS.