Patent ID: 7886142

Claim:
A base station for transmitting control information needed for demodulation of a packet data channel over a packet data control channel to a terminal, comprising: an encoder for encoding the control information; a scrambler for generating a scrambling sequence using unique information known only to the terminal and the base station and scrambling the coded control information with the scrambling sequence if the control information does not include Medium Access Control IDentification (MAC ID) information; and a modulator for modulating the scrambled control information output from the scrambler, wherein the unique information is not transmitted for the use of generating the scrambling sequence by the terminal over the packet data control channel, and wherein the scrambler generates the scrambling sequence on a basis of an initial state determined using at least two of the MAC ID, SSI (Serving Sector Indicator) information, R-CQICH (Reverse-Channel Quality Indicator Channel) information, and long code information.