Patent ID: 7039002

Claim:
A base station for providing a packet data service to a mobile station using at least one Walsh code of a plurality of quasi-orthogonal Walsh codes or a plurality of orthogonal Walsh codes to increase a data rate in a mobile communication system where the base station assigns the plurality of orthogonal Walsh codes to the mobile station, comprising: an orthogonal Walsh code space information(WSI) generator for generating information about the orthogonal Walsh codes for the packet data service; a carrier-to-interference (C/I) acquirer for receiving C/I information from the mobile station; a first determiner for receiving the orthogonal Walsh code information and the C/I information from the orthogonal Walsh code space information generator and the C/I acquirer and determining a first data rate of the case that use the orthogonal Walsh codes; a second determiner for receiving the C/I information from the C/I acquirer and determining a second data rate of the case that use the quasi-orthogonal Walsh codes; and a data rate selector for selecting a higher data rate of the first data rate and the second data rate.