Abstract:
Information on other code words can be utilized at the time of retransmitting, and transmission characteristics of the case of using multiple code words are improved. In a radio communication apparatus for transmitting data using multiple code words, as response time taken by a transmitting station to receive a response signal (Ack/Nack signal) after the data is transmitted from the transmitting station (BS) to a receiving station (UE), a cycle of second response time (RTT2) corresponding to a low-order code word is longer than a cycle of first response time (RTT1) corresponding to a high-order code word. In the receiving station, received data of the low-order code word is decoded using at least one of retransmission data and the first received data of the high-order code word and response signals are respectively generated according to a decoding result of each of the code words and notification of the response signal is provided. In the transmitting station, the response signal is acquired at timing of each of the code words and retransmitting control by HARQ is performed.
Abstract:
Provided are a base station, a terminal, a band allocation method, and a downlink data communication method in which a mapping method for synchronization signals and report signals is implemented with high resource usage efficiency when a first system in which an independent single communication is allocated to a unit band co-exists with a second system in which a plurality of unit bands can be allocated to a single communication. In a base station (200), an OFDM signal generation unit (225) maps primary synchronization channel (P-SCH), secondary synchronization channel (S-SCH), primary broadcast channel (P-BCH), and dynamic broadcast channel (D-BCH), which can be decoded by both an LTE terminal and an LTE+ terminal, to some of a plurality of unit bands available to the station itself. The OFDM signal generation unit (225) also maps D-BCH+, which can be decoded only by an LTE+ terminal, to all of the plurality of unit bands to produce a multiplexed transmission signal. When the terminal which has transmitted terminal capability information is an LTE+ terminal, a control unit (265) transmits a band movement indication which indicates changes in the reception band to that terminal.
Abstract:
There are provided a communication device, a base station, a communication system, and a communication method that make it possible to yield a diversity effect by cooperative relay without involvement of disproportionateness in data received by an eNB even when one of parties has unsuccessfully exchanged data. After received an ACK signal from a repeater 1, a repeater 2 which has transmitted a NACK signal in procedure 7 transmits data S2 to the eNB by use of its own resource, thereby making its own resource available for the repeater 1 (the repeater 2 does not use its own resource, and the repeater 1 uses the resource of the repeater 2). In procedures 8, the repeater 1 has received the NACK signal from the repeater 2 and subsequently transmits data S1 to the eNB by use of its own resource. Subsequently, the repeater 1 which has received the NACK signal in procedure 9 determines that the resource of the repeater 2 is available and transmits data P1 to the eNB by use of the resource of the repeater 2. In procedure 10, the repeater 1 transmits previously-generated data P2 to the eNB by use of its own resource.