Apparatus and method for allocating code resources to uplink ACK/NACK channels in a cellular wireless communication system

摘要

A method and apparatus are provided for allocating code resources to ACK/NACK channel indexes, when UEs need ACK/NACK transmission in a wireless communication system in which a predetermined number of orthogonal cover Walsh codes is selected from among available orthogonal cover Walsh codes, at least one subset is formed, having the selected orthogonal cover Walsh codes arranged in an ascending order of cross interference, subsets are selected for use in first and second slots of a subframe, and the orthogonal cover Walsh codes of the subset selected for each slot and ZC sequence cyclic shift values are allocated to the ACK/NACK channel indexes.

主权项

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 configured to transmit data to a user equipment (UE); a controller configured to determine 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 a plurality of ACK/NACK channel indexes and a plurality of cyclic shift values and a plurality of orthogonal cover Walsh codes; and a receiver configured to receive ACK/NACK information for the transmitted data using the determined cyclic shift value and orthogonal cover Walsh code, wherein the plurality of orthogonal cover Walsh codes comprises a first orthogonal cover Walsh code [+1 +1 +1 +1], a second orthogonal cover Walsh code [+1 −1 +1 −1], and a third orthogonal cover Walsh code [+1 −1 −1 +1].