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: A terminal device, a base station device, a communication system, a measurement method, and an integrated circuit, which are capable of efficiently performing Sidelink Direct Discovery, are provided. In the terminal device, a reception unit is configured to receive an RRC connection reconfiguration message including a first configuration related to Sidelink Direct Discovery, and in a case where the first configuration includes frequency information, to attempt to acquire configuration information about monitoring of a Sidelink Direct Discovery announcement at a frequency indicated by the frequency information, using a timer configured to count a predetermined time and while the timer is counting, by acquiring system information to be broadcast at the frequency.

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.

Abstract: A terminal apparatus for communicating with a base station apparatus includes a receiver configured to receive an RRC message from the base station apparatus, and a processing unit configured to process the RRC message. A first value is a value included in the RRC message and applied to a first timer, and the processing unit changes timing to apply the first value to the first timer, based on whether the RRC message includes first information.

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, an RRC message including an EHC configuration; and a processing unit. The processing unit configures an EHC protocol in accordance with the EHC configuration, and adds a context identifier to data in processing of the EHC protocol, and indicates, in a case that the context identifier is a particular value, that an Ethernet header of the data is uncompressed.

Abstract: A technique is provided that is related to a terminal apparatus, a base station apparatus, a communication method, and an integrated circuit which enable efficient communication. A terminal apparatus includes a receiver configured to receive, from a base station apparatus, a message requesting mobility history information, and a transmitter configured to notify the base station apparatus of the mobility history information, based on the message. The mobility history information includes a list including identifier information (first identifier information) of a cell of a first radio access technology, and a list including identifier information (second identifier information) of a cell of a second radio access technology. The mobility history information includes stay time information of a limited number of entries, each corresponding to a visit by the terminal apparatus in a cell and/or outside a network.

Abstract: A terminal apparatus for communicating with a base station apparatus, the terminal apparatus including: a receiver configured to receive an RRC reconfiguration message from the base station apparatus; and a processing unit, wherein the processing unit establishes a PDCP entity in accordance with the RRC reconfiguration message, applies, to the PDCP entity, a first ciphering algorithm, a first ciphering key, a first integrity protection algorithm, and a first integrity protection key provided by an upper layer, and based on a first request made by the upper layer, applies, to the PDCP entity, a second ciphering algorithm, a second ciphering key, a second integrity protection algorithm, and a second integrity protection key provided by the upper layer.

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: An access control method and a user equipment are provided in the present invention. The access control method in a user equipment includes: determining, according to a status of the user equipment, a corresponding access control parameter to execute access control; if a result of the access control is access barring, then starting different access barring timers corresponding to different user equipment states, or starting the same access barring timer in the different user equipment states; and determining a duration of the started access barring timer according to the corresponding access control parameter.

Abstract: A terminal apparatus for communicating with one or more base station apparatuses, the terminal apparatus including: a receiver configured to receive an RRC connection reconfiguration message including a DRB configuration from the one or more base station apparatuses; and a processing unit configured to release a PDCP entity, in a case that information indicating that a full configuration is applied is included in the RRC connection reconfiguration message, and that a value of an EPS bearer identity included in the DRB configuration is part of a current configuration of the terminal apparatus, and that the PDCP entity is configured on a DRB corresponding to the EPS bearer identity.

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, the terminal apparatus is configured with EN-DC, and the DRB was configured for the EPS bearer identity before the RRC reconfiguration message is received.

Abstract: Provided is a terminal apparatus for communicating with a base station, the terminal apparatus including: a receiver configured to receive, from the base station apparatus, a Radio Resource Control layer (RRC) reconfiguration message including a list of a Data Radio Bearer (DRB) identity corresponding to a DRB to be released; and a processing unit configured to, in a case that a first DRB identity corresponding to the DRB configured for the terminal apparatus is included in the list, release a Packet Data Convergence Protocol Layer (PDCP) entity associated with the first DRB identity and indicate to a Service Data Adaptation Protocol (SDAP) layer information of the DRB corresponding to the first DRB identity.

Abstract: In a case of using one PDCP entity to communicate with a source cell and a target cell, a terminal apparatus associates, with the PDCP, a radio bearer of the source cell and a radio bearer of the target cell that are associated with an identical EPS bearer identity, and the PDCP manages two keys.

Abstract: A terminal apparatus receives a higher layer parameter and a PDSCH, and generates a HARQ-ACK codebook and transmits the generated HARQ-ACK codebook on a PUCCH. In a case that a first parameter is configured, a first HARQ-ACK codebook and a second HARQ-ACK codebook are generated, the first HARQ-ACK codebook is used to transmit a HARQ-ACK bit corresponding to a PDSCH A, and the second HARQ-ACK codebook is used to transmit a HARQ-ACK bit corresponding to a PDSCH B. In a case that the first parameter is not configured, the first HARQ-ACK codebook is generated, and the first HARQ-ACK codebook is used to transmit the HARQ-ACK bit corresponding to the PDSCH B.

Abstract: A terminal apparatus applies a configuration of an RRC reconfiguration message to a second configuration which is identical to a part or entirety of a first configuration in a case that the RRC reconfiguration message includes first information, and applies the configuration of the RRC reconfiguration message to the first configuration in a case that the RRC reconfiguration message includes no first information.