Patent ID: 8670297
Filing Date: 2014-03-11
Classification: H04B,H04J,H04L,H04W

Abstract:
1. An apparatus for receiving ACKnowledgment/Negative ACKnowledgment (ACK/NACK) information at a Base Station (BS) in a wireless communication system, the apparatus comprising: a transmitter for transmitting data to a User Equipment (UE); a controller for checking a cyclic shift value and an orthogonal cover Walsh code that are mapped to an ACK/NACK channel index for the UE based on a mapping relationship between ACK/NACK channel and cyclic shift values and orthogonal cover Walsh codes; and a receiver for receiving ACK/NACK information for the transmitted data using the checked cyclic shift value and orthogonal cover Walsh code, wherein according to the mapping relationship, first and third orthogonal cover Walsh codes among the orthogonal cover Walsh codes are mapped respectively to two ACK/NACK channel indexes transmitted using an even-numbered cyclic shift value among the cyclic shift values, and a second orthogonal cover Walsh code is mapped to one ACK/NACK channel index transmitted using an odd-numbered cyclic shift value among the cyclic shift values, and wherein the first orthogonal cover Walsh code is [+1 +1 +1 +1], the second orthogonal cover Walsh code is [+1 −1 +1 −1], and the third orthogonal cover Walsh code is [+1 −1 −1 +1].