Patent ID: 8059552

Claim:
An apparatus for transmitting control information in a mobile communication system simultaneously supporting a synchronous high-rate packet data system and an Orthogonal Frequency Division Multiplexing (OFDM) system, the apparatus comprising: a power measurer for measuring power of a Medium Access Control (MAC) channel of a current slot; and a selection controller for comparing the measured power of the MAC channel with marginal maximum power and selecting the MAC channel or an OFDM symbol for transmitting control information for a terminal in one slot according to a comparison result; and a transmitter for transmitting the control information allocated to the MAC channel or the OFDM symbol to the terminal, wherein the selection controller selects the OFDM symbol for transmitting the control information for the terminal supporting an OFDM transmission scheme, when the measured power of the MAC channel exceeds the marginal maximum power, and wherein the selection controller selects the MAC channel for transmitting the control information, when the measured power of the MAC channel does not exceed the marginal maximum power.