Abstract: The present invention provides a radio communication control method, in a communication system in which the system band is widened by aggregating a plurality of fundamental frequency blocks, that is suitable to transmit a downlink shared channel and its downlink control channel in different fundamental frequency blocks. According to this radio communication control method, a normal component carrier and an concatenated component carrier are selected for radio communication with a user terminal, and resources are allocated such that, in the event the user terminal is a terminal of LTE specifications which can support up to a fundamental frequency block, communication is made possible based on the LTE specifications using only the fundamental frequency block, and, in the event the user terminal is a terminal of the LTE-A specifications which can support up to the concatenated frequency block, communication is performed based on the LTE specifications using the concatenated frequency block.

Abstract: To provide a base station apparatus, a mobile terminal apparatus and a communication control method supporting respectively a plurality of mobile communication systems coexist mutually. The base station apparatus in a radio communications system in which an LTE-A system and an LTE system are placed so as to coexist with each other, the LTE-A system having a system band composed of a plurality of component carriers, the LTE system having a system band composed of a single component carrier, the base station apparatus is configured to generate ACK/NACK of HARQ to uplink transmission of a plurality of the component carriers, set offset as 0 to the component carrier used in the LTE system, set the offset to be increased beginning at the aforementioned component carrier in order of being circuited among the plurality of the component carriers, and add the aforementioned offset to the allocation resource of ACK/NACK.

Abstract: A mobile communication method according to the present invention includes a step A of transmitting, by a radio base station eNB, “RRC Connection Reconfiguration” including setting information on a plurality of CCs and PDCCHs to a mobile station UE, and a step B of transmitting, by the mobile station UE, “RRC Connection Reconfiguration Complete” to the radio base station eNB using a contention-based channel in response to the received “RRC Connection Reconfiguration”.

Abstract: The present invention provides a search space configuration that is suitable for a communication system in which a plurality of fundamental frequency blocks are grouped together into a wide band. A base station apparatus (20) has a selection section (302) that selects a system band in fundamental frequency block units, a downlink control information generation section (306) that generates downlink control information for demodulating the data channels that are sent separately in the selected fundamental frequency blocks, and arranges, in the downlink control channel of a specific fundamental frequency block among a plurality of fundamental frequency blocks, a search space in which downlink control information for the plurality of fundamental frequency blocks is contained, and a transmission section (203) that transmits the downlink control channel in which the search space with the downlink control information is arranged.

Abstract: A communication apparatus in a mobile communication system includes a first control information generation unit configured to generate first control information including retransmission information on a previously received data channel, a second control information generation unit configured to generate second control information including scheduling information on radio resources and a transmission signal generation unit configured to generate a transmission signal including a lower layer control channel including at least one of the first control information and the second control information. The transmission signal generation unit generates the transmission signal to transmit the first control information in any of subframes arriving at a first cycle and to transmit the second control information in any of subframes arriving at a second cycle longer than the first cycle.

Abstract: A base station apparatus having a control information generation section that generates, per fundamental frequency block, a downlink control information piece for demodulating a data channel that is transmitted for each of a plurality of fundamental frequency blocks assigned to a user terminal, a determining section that determines, per fundamental frequency block, a search space which is a candidate area where the downlink control information piece is arranged, and a transmission section that transmits a downlink control channel in which the search space containing the downlink control information piece is arranged is disclosed.

Abstract: A wireless base station is disclosed. The wireless base station includes a traffic-identifying section which determines a type of traffic of data input; a resource manager and allocator which allocates, for the data input, a wireless resource at constant periods and in a constant pattern when the data input is of a type of traffic that is suitable for periodic allocation, and successively allocates a wireless resource available, for traffic of a type other than the type of the traffic that is suitable for the periodic allocation; and a retransmission-control switching unit which applies synchronous retransmission control for the type of the traffic that is suitable for the periodic allocation, and applies asynchronous retransmission control for the traffic of the other type when there is a retransmission request.

Abstract: A disclosed base station includes a transmission-rate determining unit for determining a transmission rate of a control channel for transmitting an upper-layer control signal, and a transmitter for allocating a predetermined bandwidth to the control channel for transmitting the upper-layer control signal according to the determined transmission rate, and transmitting the signal.

Abstract: To maintain communications of uplink ACK/NACK signals even for a transition period during which the number of aggregated component carriers is added/removed by higher layer signaling, it is a feature providing a reception section that receives the PDSCH for each of CCs that constitute the system band, a demodulation section (406) that demodulates the received PDSCH of each of CCs, an ACK/NACK signal generating section (418) that generates an uplink ACK/NACK signal in response to a demodulation result of the PDSCH in the demodulation section (406), and a mapping section (415) that allocates radio resources to an uplink ACK/NACK signal of the anchor block using LTE, while allocating user-specific radio resources to uplink ACK/NACK signals of the other CCs.

Abstract: A user apparatus for use in a mobile communications system is disclosed. The user apparatus includes a unit which determines, using acknowledgement information received from a communications counterpart, whether retransmission is required for a transmitted signal; and a unit which transmits, to the communications counterpart, a signal required to be retransmitted according to a round-trip delay (RTD) which is set for the user apparatus for retransmission control, wherein, the RTD of the user apparatus is arranged to be changed, when the user apparatus enters a region which uses an RTD shorter than the RTD set for the user apparatus to an integer multiple of the shorter RTD.

Abstract: The present invention maintains communication even during a transition period in which ON/OFF of the CIF is switched by higher layer signaling or during a transition period in which the number of component carrier aggregations is increased/decreased. In a radio communication system in which an LTE-A system, in which an LTE-A system to add or remove the frequency band to assign for communication between a base station apparatus (20) and a mobile terminal apparatus (10) on a per component carrier basis, and an LTE system to perform communication between the base station apparatus (20) and the mobile terminal apparatus (10) using one fixed fundamental frequency block, are arranged in an overlapping manner, in the LTE-A system, one of the fundamental frequency blocks assigned to the mobile terminal apparatus (10) is determined as an anchor block, and the anchor block supports the same operation as in the LTE system.

Abstract: A mobile communication method according to the present invention comprises: a step A of individually notifying, by a radio base station eNB, a mobile station UE performing CA of correspondence relation between a DL carrier for transmitting an “UL grant” and an UL carrier to which a PUSCH resource is assigned by the “UL grant”, and a step B of transmitting, by the mobile station UE, an uplink data signal using the PUSCH resource through the UL carrier based on the above-described correspondence relation when the “UL grant” is received through the DL carrier.

Abstract: Wideband transmission is performed efficiently using spectrum aggregation. When performing information transmission using spectrum aggregation that aggregates frequency spectra which are non-contiguous and in different frequency bands, first information requiring communication quality is allocated to an anchor spectrum with small path loss among different frequency spectra used for information transmission and transmitted to a mobile station apparatus (UE), and second information requiring lower communication quality than the first information is allocated to a payload spectrum having large path loss and transmitted to the mobile station apparatus (UE).

Abstract: Provided are a mobile terminal apparatus, a radio base station apparatus and a radiocommunication method, capable of saving PHICH resources enough and realizing effective retransmission control of uplink SU-MIMO. The radio communication method of the present invention is characterized in that a radio base station apparatus receives signals of plural codewords, when there is an error in each of the codewords, generates a one-bit negative response physical HARQ indicator channel signal and transmits the physical HARQ indicator channel signal, and a mobile terminal apparatus receives the physical HARQ indicator channel signal and transmits retransmission signals of all the codewords to the radio base station apparatus based on the negative response physical HARQ indicator channel signal.

Abstract: A mobile station UE according to the present invention comprises an RACH procedure unit 12 configured to attempt to detect an RA response for an RA preamble only through a DL carrier corresponding to an UL carrier, from among a plurality of DL carriers, when the mobile station performs CA and has transmitted the RA preamble through the UL carrier.

Abstract: A radio communication apparatus includes a scheduling unit configured to determine a resource block based on an allocation pattern of resource blocks, where frames in which multiple resource blocks are arranged in a frequency direction are repeatedly formed in a time direction, the allocation pattern using a frame number as a variable. The radio communication apparatus also includes a transmitting unit configured to transmit a packet according to the resource block determined by the scheduling unit.

Abstract: The present invention provides a radio base station apparatus, a radio terminal apparatus and a radio communication method that can realize highly efficient fallback mode when transmission diversity is adopted in fallback mode in an LTE-A system. With the radio communication method of the present invention, a radio base station apparatus, in fall back mode, performs scheduling for fallback mode, which takes into account the reference signal structures in fallback mode, and transmits a transmission signal after the scheduling by open loop control transmission diversity, and a mobile terminal apparatus receives a downlink signal including mode information, and, in fallback mode, performs channel estimation for fallback mode based on the mode information, and demodulates the downlink signal using the acquired channel estimation value.

Abstract: A mobile station includes a control unit configured to change at least one parameter for a retransmission packet from that of a transmission packet, where the at least one parameter is selected from a data modulation scheme; a channel coding rate; a puncturing pattern; a spreading factor; a frequency bandwidth; a frequency allocation position; and transmission power.

Abstract: The present invention is directed to preventing the load to be required for blind detection in a mobile station apparatus (UE) from increasing and switching between SU-MIMO and MU-MIMO dynamically, even in the event the system bandwidth is expanded. The present invention has a DCI format selection section (209) that selects identification information which identifies between a DCI format for SU-MIMO and a DCI format for MU-MIMO, a control signal generation section (210) that generates control signals including the identification information and including the DCI format for SU-MIMO or MU-MIMO, having the same number of bits, and a transmission section that transmits the control signals to a mobile station apparatus.

Abstract: The present invention is directed to preventing occurrence of PDCCH blocking while reducing PDCCH detection errors. The present invention provides a search space size adaptive control section (203) that controls the size of the UE-specific search space adaptively depending on the number of component carriers to which a PDSCH for a mobile station apparatus (10) is assigned, a control information generation section (201) that generates control information reflecting a control result by the search space size adaptive control section (203), and a transmission/reception section (23) that transmits this control information to a mobile station apparatus (10) by RRC signaling.