Patent ID: 8817673
Filing Date: 2014-08-26
Classification: H04L,H04W

Abstract:
1. A method for allocating an acknowledgement (ACK)/negative acknowledgement (NACK) channel by a base station (BS) in a frequency division duplexing (FDD) system, the method comprising: if a channel selection mode using a spatial orthogonal resource transmit diversity (SORTD) scheme as a mode for ACK/NACK information feedback of a user equipment (UE) is set, allocating downlink resources in one or more cells to the UE; transmitting, to the UE, physical downlink control channel (PDCCH) information and downlink data via the downlink resources; allocating at least four ACK/NACK channels to the UE; receiving ACK/NACK information for the PDCCH information and the downlink data fed back by using two antennas from the UE, via at least one ACK/NACK channel among the four ACK/NACK channels; and performing re-transmission or transmitting new data according to the ACK/NACK information, wherein at least two of the at least four ACK/NACK channels are the same as at least two ACK/NACK channels allocated by the BS in a mode not using the SORTD scheme, and the at least two of the at least four ACK/NACK channels are allocated to same antennas.