Abstract: A communication system includes a terminal apparatus and a base station apparatus. The terminal apparatus communicates with a base station apparatus by carrier aggregation using a plurality of serving cells, where each of the plurality of serving cells has a different frequency. In addition, the terminal apparatus removes a measurement identity relevant to a serving cell of the plurality of serving cells based on that the serving cell was removed.

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: There is provided a terminal including: a reception unit that receives, from a base station, a measurement configuration which associates information indicating an object cell on which given processing is to be performed, with a conditional configuration indicating a condition to initiate the given processing; a measurement unit that measures reception quality of a cell; and a control unit that initiates the given processing corresponding to the conditional configuration when the measured cell is included in the object cell and the reception quality of the measured cell fulfills the condition to initiate the given processing.

Abstract: A method by a user equipment (UE) is described. The method includes receiving by the RRC entity of the UE, a PUCCH release request from a lower layer of the UE, and applying the default physical channel configuration for a scheduling request configuration for a concerned secondary cell, upon receiving the PUCCH release request from the lower layers of the UE. The PUCCH release request is notified by a Medium Access Control (MAC) entity of the UE in a case that a time alignment timer expires, the time alignment timer is associated with a secondary timing advance group (sTAG) and the concerned secondary cell belongs to the sTAG.

Abstract: A terminal apparatus executing radio communication with a base station apparatus, the terminal apparatus: transmits a first message, including a random access preamble and identification information of the terminal apparatus, for starting a random access procedure to the base station apparatus; receives a second message, including a random access response to the first message, from the base station apparatus; and selects one random access preamble group from among a plurality of random access preamble groups on the basis of a first condition, a second condition, a third condition, and a status of the terminal apparatus, in order to notify the base station apparatus of the status of the terminal apparatus when transmitting the first message. Consequently, even when a 2-step random access procedure is adopted, radio resources for the radio communication between the base station apparatus and the terminal apparatus can be used efficiently.

Abstract: Disclosed is a radio communication system in which a base station device and a terminal device communicate with each other, and the terminal device performs a random access procedure. The base station device notifies the terminal device of random access common configuration information including the number of repetitions for each level, information indicating a relationship between group information of random access preambles and the level, and the number of attempts of preamble transmission for each level. A MAC layer in the terminal device performs processing of increasing the level in a case that a first counter exceeds the number of attempts of transmission corresponding to the level.

Abstract: Provided is technology relating to: a terminal device, a base station device, a communication system, a communication method, and an integrated circuit capable of efficiently performing a radio resource control procedure. The terminal device is provided with a first sublayer and a second sublayer that is a lower sublayer than the first sublayer. The first sublayer creates an RRC message corresponding to an RRC procedure and starts a timer relating to the RRC procedure on the basis of coverage level information. The second sublayer executes a random access procedure relating to the RRC procedure on a serving cell, determines the coverage level information in the random access procedure, and selects a random access preamble group on the basis of the determined coverage level information.

Abstract: A communication system includes a terminal apparatus and a base station apparatus. The terminal apparatus communicates with a base station apparatus by carrier aggregation using a plurality of serving cells, where each of the plurality of serving cells has a different frequency. In addition, the terminal apparatus removes a measurement identity relevant to a serving cell of the plurality of serving cells based on that the serving cell was removed.

Abstract: A terminal device includes a transmission processing part configured to notify the network of a type of the terminal device, and a reception processing part configured to derive the required number of repetitive transmissions and/or repetitive receptions (the first number of repetitions) on the basis of downlink reference signal received power. The terminal device measures the downlink reference signal received power on the basis of the first measurement period longer than 200 ms, upon deriving the first number of repetitions. The type of the terminal device notified to the network is different from a type of a terminal device employing a measurement period of 200 ms.

Abstract: A communication system includes a terminal apparatus and a base station apparatus. The terminal apparatus communicates with a base station apparatus by carrier aggregation using a plurality of serving cells, where each of the plurality of serving cells has a different frequency. In addition, the terminal apparatus removes a measurement identity relevant to a serving cell of the plurality of serving cells based on that the serving cell was removed.

Abstract: Provided is a technique related to a terminal apparatus, a base station apparatus, a communication system, a communication method, and an integrated circuit which are capable of efficiently performing device-to-device communication. Based on a measurement result of an inter-frequency neighboring cell that supports the direct communication, a cell selection criterion that is used for cell selection, and system information related to the direct communication, which is acquired from a base station apparatus, a terminal apparatus capable of direct communication with a terminal apparatus performs the direct communication with the inter-frequency neighboring cell by using a radio resource pool that is indicated with the system information.

Abstract: A communication system that includes a terminal apparatus and a base station apparatus. The terminal apparatus obtains, from the base station apparatus, information regarding addition of a component carrier, whereby the information regarding addition of the component carrier comprises information related to carrier frequency of the component carrier and information related to system bandwidth of the component carrier. The base station apparatus provides, to the terminal apparatus, information regarding addition of a component carrier, whereby the information regarding addition of the component carrier comprises information related to carrier frequency of the component carrier and information related to system bandwidth of the component carrier.

Abstract: A method by a user equipment (UE) is described. The method includes determining a repetition level, determining a initialization value for a scrambling sequence generator based on the repetition level, generating the scrambling sequence, and applying the scrambling sequence for a Physical Downlink Shared Channel (PDSCH). The repetition level is associated with the PDSCH and determined by a Radio Resource Control (RRC) configuration.

Abstract: A mobile station (MS) obtains a parameter, performs transmission of a preamble, and sets a counter incremented based on transmission of the preamble. The MS is able to indicate a random access problem corresponding to one transmission timing cell group in a case where the counter reaches the parameter+1 and the transmission of the preamble is performed on the one transmission timing cell group, where the one transmission timing cell group being one of the plurality of transmission timing cell groups, and the MS is able to not indicate a random access problem corresponding to another transmission timing cell group in a case where the counter reaches the parameter+1 and the transmission of the preamble is performed on the another transmission timing cell group, where the another transmission timing cell group being one of the plurality of transmission timing cell groups.

Abstract: Provided is a technique related to a terminal apparatus, a control method, and an integrated circuit that are able to efficiently perform connection control when performing device-to-device communication. At a time of re-establishing radio resource control connection, at least on a basis of whether or not device-to-device data communication is able to be performed in a selected cell and whether or not there is data of the device-to-device data communication in the terminal apparatus, the terminal apparatus selects information about the device-to-device data communication, which is to be notified to the base station apparatus.

Abstract: A method by a user equipment (UE) is described. The method includes determining a repetition level, determining a initialization value for a scrambling sequence generator based on the repetition level, generating the scrambling sequence, and applying the scrambling sequence for a Physical Downlink Shared Channel (PDSCH). The repetition level is associated with the PDSCH and determined by a Radio Resource Control (RRC) configuration.

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: A wireless communication system in which a first base station apparatus and a second base station apparatus communicate with a terminal apparatus. The first base station apparatus transmits, to the terminal apparatus, data control information related to data transmission and reception of the terminal apparatus and preferential base station apparatus information indicating a priority of data transmission to the base station apparatus, and the terminal apparatus determines any base station apparatus of the first base station apparatus and the second base station apparatus, as a data transmission destination base station apparatus, for data to which bearer split is configured by the data control information, based on at least one of the preferential base station apparatus information and terminal information of the terminal apparatus.

Abstract: There are provided a base station, a terminal, and a communication system in a wireless communication system in which a base station and a terminal communicate with each other, in which the base station and the terminal can efficiently perform communication. The communication system includes a higher layer processing unit 605 configured to configure, at the base station, for each terminal, a first reference signal configuration for configuring a measurement target for channel state reporting, configured to configure, at the base station, for each terminal, a second reference signal configuration specifying a resource element to be excluded from the target of data demodulation in a case where the terminal demodulates data, and configured to configure, at the base station, for each terminal, a third reference signal configuration for configuring a measurement target for which a reference signal received power is to be measured by the terminal.

Abstract: A terminal device, a base station device, a communication method, and an integrated circuit are provided for efficiently performing measurements. A base station device notifies a terminal device of a report configuration including information about an RSSI report, a measurement object indicating at least one frequency assumed as a frequency applicable for an RSSI measurement by the terminal device, and a measurement identifier for linking the report configuration to the measurement object. In a case where the information about the RSSI report is included in a report configuration associated with a measurement identifier, the terminal device assumes at least one frequency indicated by the measurement object associated with the report configuration as the frequency applicable for the RSSI measurement. In a case where at least one frequency to be reported is present, the terminal device reports an RSSI result measured at such an associated frequency, as a measurement result.