Method and apparatus for transmitting and receiving control information to randomize inter-cell interference in a mobile communication system

A method for receiving control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the method comprising the steps of:

• receiving, by a Node B, a control channel signal, including the control information, from a User Equipment (UE);
• generating, by the Node B, a random cyclic shift value based on an SC-FDMA symbol index and a slot index;
• multiplying, by the Node B, the control channel signal by a sequence;
• and
• acquiring, by the Node B, the control information by cyclically shifting the multiplied control channel signal by the random cyclic shift value on an SC-FDMA symbol basis.

An apparatus for transmitting control information in a Single Carrier-Frequency Division Multiple Access (SC-FDMA) system, the apparatus comprising:

• a control information generator for generating the control information;
• a sequence generator for generating a random cyclic shift value based on an SC-FDMA symbol index and a slot index;
• a randomizer for cyclically shifting a sequence by the random cyclic shift value;
• a multiplier for multiplying a control channel signal, including the control information, by the cyclically shifted sequence on an SC-FDMA symbol basis;
• and
• a transmitter for transmitting the multiplied control channel signal in an SC-FDMA symbol to a Node B.