Abstract: Even when it is not possible to appropriately receive SRS, a control process is appropriately performed. A radio base station eNB according to the present invention includes a control unit 13 configured to perform a predetermined control process based on SRS periodically transmitted by a mobile station UE, an SRS reliability determination unit 11 configured to compare the reception quality of an SRS at the reception timing of the SRS with a predetermined threshold value, and an SRS transmission state determination unit 12 configured to determine whether the SRS is being transmitted by the mobile station UE based on a result of the comparison, wherein, when it is determined that the SRS is not being transmitted by the mobile station UE, the control unit 13 is configured not to perform a predetermined control process based on the SRS at the reception timing of the SRS as described above.

Abstract: A radio base station eNB according to the present invention includes: a transmission format determination unit 13 configured to determine a transmission format of an uplink data signal where HARQ is performed; a frequency resource determination unit 14 configured to determine a frequency resource of the uplink data signal; a transmission instruction unit 15 configured to instruct new transmission and retransmission of the uplink data signal via PDCCH; and a transmission acknowledgement information transmission unit 12 configured to transmit transmission acknowledgement information of the uplink data signal via PHICH, wherein the transmission acknowledgement information transmission unit 12 always transmits, when a subframe bundling is applied to the uplink data signal, ACK as the transmission acknowledgement information.

Abstract: A radio base station eNB according to the present invention includes: a path loss calculation unit 25 configured to calculate a path loss PL in PUSCH based on a maximum transmittable power PTXMAX, UPH, the number of resource blocks MPUSCH, an offset value ?TF (TF(i)) corresponding to a transmission format, and a transmission power determination parameter P0_nominal_PUSCH common to cells, and a transmission unit 23 configured to transmit a transmission power offset value P0_UE_PUSCH unique to a mobile station UE, by an RRC message, to the mobile station UE, when a random access procedure is completed, wherein when the random access procedure is completed, the transmission unit 23 transmits a transmission power offset value P0_UE_PUSCH unique to the mobile station, which has a value different from the previously transmitted transmission power offset value P0_UE_PUSCH unique to the mobile station.

Abstract: A radio base station includes a resource assignment unit configured to determine a time direction resource, a frequency direction resource, and a code direction resource which are to be assigned as a scheduling request transmission resource for transmitting a scheduling request that requests scheduling for uplink data communication to each mobile station. The resource assignment unit is configured to determine the time direction resource and the frequency direction resource, which are to be assigned as the scheduling request transmission resource, and then determine the code direction resource to be assigned as the scheduling request transmission resource. The resource assignment unit is configured to assign, as the scheduling request transmission resource, in order from a frequency direction resource having a lower usage rate of the code direction resource in each time direction resource.

Abstract: A radio base station according to the present invention comprising: a radio base station configured to transmit a transmission power control command for a mobile station for controlling transmission power of an uplink data signal of the mobile station via a downlink control channel for a transmission power control command mapped to a specific subframe in a downlink channel, the radio base station including a resource assignment unit configured to decide the specific subframe and a transmission unit configured to transmit the transmission power control command for the mobile station via the downlink control channel for the transmission power control command mapped to the specific subframe decided by the resource assignment unit, in which the resource assignment unit is configured to decide the specific subframe according to a number of transmission power control commands transmitted in each subframe.

Abstract: A radio base station including a resource assignment unit configured to assign a time direction resource, a frequency direction resource, and a code direction resource, as a physical signal transmission resource for transmitting a predetermined physical signal, to each mobile station is disclosed. The frequency direction resource is specified by a frequency position within a frequency region when frequency bandwidths used in a plurality of physical signals transmitted by each mobile station are the same.

Abstract: A radio base station includes a resource assignment unit for assigning a resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal to a first mobile station during a semi-persistent scheduling bearer setting process. The resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal is formed by a combination of a frequency direction resource and a code direction resource by which the first mobile station transmits a transmission acknowledgement signal after a predetermined timing from a timing of receiving downlink data, to the downlink data that has been scheduled by semi-persistent scheduling and has been transmitted via a downlink data channel.

Abstract: A radio base station including a resource assignment unit configured to determine a time direction resource, a frequency direction resource, and a code direction resource which are to be assigned as a reception quality notification resource that should be used for notifying each mobile station of a reception quality in a downlink, the resource assignment unit is configured to determine the time direction resources and the frequency direction resources, which are to be assigned as the reception quality notification resource, and then determine the code direction resources to be assigned as the reception quality notification resource the resource assignment unit is configured to assign, as the reception quality notification resource, in order from a frequency direction resource with a lower usage rate of the code direction resource, within each time direction resource.

Abstract: A base station apparatus determines which mode of a subframe bundling mode (second mode) and a non-bundling mode (first mode) should be used by a user apparatus for communication, and reports a determination result. In the first mode, RTT period is a first period, and each of transmission and retransmission of the signal is performed every 1 TTI. In the second mode, RTT period is a second period that is longer than the first period, and each of transmission and retransmission of the signal is performed every plurality of TTIs. A radio resource to be used for retransmission is determined according to a first frequency hopping pattern in the first mode, and is determined according to a second frequency hopping pattern that is different from the first frequency hopping pattern in the second mode.