METHOD OF TRANSMITTING AND RECEIVING FOR UPLINK MIMO RETRANSMISSION ACCORDING TO PHICH IN LTE SYSTEM AND APPARATUS THEREOF

摘要

The present invention relates to a transmission / reception method for applying UL MIMO in an LTE system, and a method for determining a scrambling sequence, a UL RS, and a PHICH to be applied when a PUSCH is retransmitted by a PHICH without a separate PDCCH control signal do. PDCCH has an advantage of indicating a specific transmission characteristic to be used in initial transmission or retransmission, but has a disadvantage in that it requires more resources to inform control information due to a large amount of information. In LTE UL, adaptive synchronous HARQ is adopted to reduce the case of transmitting PDCCH, so a method of instructing retransmission by only PHICH should be provided. In the UL MIMO scheme, if a scrambling sequence, a UL RS, and a PHICH scheme to be used in a retransmission requested by a PHICH alone are defined without a PDCCH, resource consumption by the PDCCH can be prevented. However, if the number of retransmission TBs decreases, the PDCCH must be transmitted. To solve this problem, it proposes the operation of the base station and the terminal in the situation where (NACK, ACK) or (ACK, NACK) is transmitted to the PHICH and the PDCCH is not transmitted.