Radio communication apparatus and radio communication method
View Patent ↗Provided is a mobile communication system capable of obtaining a diversity effect even when a signal received by a relay station has an error in a corporate relay to which time space encoding is applied. In this mobile communication system, when S 1 has no error and S 2 has an error, a relay station ( 1 ) does not perform relay transmission at time t (Null) and relay-transmits S 1 * to a base station at time t+T. That is, in this case, the relay station ( 1 ) relay-transmits at time t+T only S 1 to be transmitted at time t when no error is contained in either S 1 or S 2 . Moreover, when S 1 has an error and S 2 has no error, the relay station ( 1 ) relay-transmits S 2 at time t and does not perform relay transmission at time t+T (Null). That is, in this case, the relay station ( 1 ) relay-transmits only S 2 to be transmitted at time t+T at time t if no error is contained in either S 1 or S 2.
1. A radio communication apparatus that performs relay transmission, comprising:
a receiving section that receives a plurality of signals;
a determination section that determines whether or not there are errors in the plurality of signals;
an encoding section that, when there are no errors in the plurality of signals, encodes the plurality of signals by encoding for generating a second signal sequence different from a first signal sequence used in another radio communication apparatus performing relay transmission, and that, when there are errors in one of the plurality of signals, encodes only signals without errors by encoding for generating the first signal sequence; and
a transmitting section that transmits the encoded signal.
2. The radio communication apparatus according to claim 1 , further comprising a generating section that, in an event that there are errors in one of the plurality of signals, generates a report signal for reporting the event,
wherein the transmitting section transmits the report signal.
3. The radio communication apparatus according to claim 1 , wherein, when there are errors in one of the plurality of signals, the receiving section receives a signal subjected to relay transmission from another radio communication apparatus.
4. The radio communication apparatus according to claim 1 , wherein, when there are no errors in a signal scheduled to be transmitted at a first time, there are errors in a signal scheduled to be transmitted at the second time later than the first time, priority of the radio communication apparatus is lower than priority of the another radio communication apparatus, and the another radio communication apparatus performs relay transmission at the first time, the transmitting section transmits a signal generated by the encoding for generating the first signal sequence at a second time.
5. The radio communication apparatus according to claim 1 , wherein when there are no errors in a signal scheduled to be transmitted at a first time, there are errors in a signal to be transmitted at a second time later than the first time, priority of the radio communication apparatus is lower than priority of the another radio communication apparatus, and the another radio communication apparatus transmits a signal generated using the encoding for generating the first signal sequence, the transmitting section transmits a signal generated by the encoding for generating the first signal sequence.
6. A radio communication method used in a radio communication apparatus that performs relay transmission, said radio communication apparatus implementing steps comprising:
receiving a plurality of signals;
determining whether or not there are errors in the plurality of signals;
when there are no errors in the plurality of signals, encoding the plurality of signals by encoding for generating a second signal sequence different from a first signal sequence used in another radio communication apparatus performing relay transmission, and, when there are errors in one of the plurality of signals, encoding only signals without errors by encoding for generating the first signal sequence; and
transmitting the encoded signal.