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 mobile station apparatus configures first and second timers related to first and second groups. A first group of cells uses a first uplink transmission timing, and a second group of secondary cells uses a second uplink transmission timing. When the first timer of the first group has expired: all transmission HARQ buffers in association with the cells of the first group are flushed, the second timer is considered as expired, and an uplink transmission on any cells except random access preamble transmission on the primary cell is stopped. In a case where the second timer of the second group has expired: all transmission HARQ buffers in association with the secondary cells of the second group are flushed, and an uplink transmission on any cells in the second group except random access preamble transmission on the any cells in the second group is stopped.

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 system, a measurement method, and an integrated circuit, which are capable of efficiently performing Sidelink Direct Discovery, are provided.

Abstract: A terminal device configured to communicate with a base station device receives random access common information including information on a random access response reception and information on a contention resolution message reception for each repetition level from the base station device, selects a random access preamble corresponding to a repetition level using the random access common information, and selects a contention resolution timer value corresponding to the repetition level selected from the random access common information.

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 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 measurement object of which a terminal device takes a measurement is selected based on information of whether or not the measurement object included in a measurement configuration message notified by a base station device includes a parameter for a gap configuration or for a cell identification time configuration for small-cell measurement, and receiving power of a cell in which the terminal device itself is present.

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 communication system that includes at least 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, wherein each serving cell of the plurality of serving cells has a different frequency. The terminal apparatus receives (from the base station apparatus) a measurement configuration which includes a reporting configuration, a measurement object to indicate a measurement frequency and a measurement identity which links the measurement object to the reporting configuration. The terminal apparatus, in a case that an entry condition of the event corresponding with an event identity of the reporting configuration is fulfilled, transmits (to the base station apparatus) a measurement report which includes measurement results of all of the serving cells.

Abstract: A mobile station apparatus configures first and second timers related to first and second groups. A first group of cells uses a first uplink transmission timing, and a second group of secondary cells uses a second uplink transmission timing. When the first timer of the first group has expired: all transmission HARQ buffers in association with the cells of the first group are flushed, the second timer is considered as expired, and an uplink transmission on any cells except random access preamble transmission on the primary cell is stopped. In a case where the second timer of the second group has expired: all transmission HARQ buffers in association with the secondary cells of the second group are flushed, and an uplink transmission on any cells in the second group except random access preamble transmission on the any cells in the second group is stopped.

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 a technology relating to a terminal device, a base station apparatus, a communication system, a communication method, and an integrated circuit, in all of which it is possible that a communication procedure relating to device-to-device communication is efficiently performed.

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 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 method by a user equipment (UE) is described. The method includes receiving a RRC message including a first parameter related to a maximum number of scheduling request transmission for a secondary cell, performing a scheduling request procedure based on the first parameter, and transmitting a scheduling request on a Physical Uplink Control Channel (PUCCH) on the secondary cell. The RRC message further includes a second parameter related to a maximum number of scheduling request transmission for a primary cell and the scheduling request procedure is performed further based on the second parameter.

Abstract: A terminal that communicates with a base station monitors a physical downlink control channel allocated in a physical downlink control channel region and an enhanced physical downlink control channel allocated in a physical downlink shared channel region different from the physical downlink control channel region. If the enhanced physical downlink control channel is detected, the terminal reports response information via a physical uplink control channel resource corresponding to the resource in which the enhanced physical downlink control channel was detected.

Abstract: A method by a user equipment (UE) is described. The method includes receiving, an evolved Node B (eNB) a RRC message including a parameter related to a SR periodicity for a secondary cell and a parameter related to a SR prohibit timer; and setting the SR prohibit timer based on the SR periodicity for the secondary cell. Setting the SR prohibit timer may be further based on the SR periodicity for the primary cell.

Abstract: A mobile station apparatus that obtains, from the base station apparatus, frequency information for a one cell of the plurality of the cells and a parameter of a timer, where a state of the one cell is changed to deactivation state based on expiry of the timer.

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.