Method for transmitting channel quality information based on differential scheme

A method for transmitting, by a mobile station, channel quality information (CQI) in a mobile communication system, the method comprising:

• transmitting a first average CQI value for a first set of sub-bands;
• and
• transmitting a differential CQI value for a preferred subset of the first set of subbands,
• wherein the differential CQI value is one of a predetermined number of differential CQI values and indicates a difference value given by:
• the difference value=a second average CQI value for the preferred subset of the first set of sub-bands−the first average CQI value, and
• wherein the predetermined number of differential CQI values include more differential CQI values for non-negative difference values than differential CQI values for negative difference values.

A method for receiving, by a base station, channel quality information (CQI) in a mobile communication system, the method comprising:

• receiving a first average CQI value for a first set of sub-bands;
• and
• receiving a differential CQI value for a preferred subset of the first set of sub-bands,
• wherein the differential CQI value is one of a predetermined number of differential CQI values and indicates a difference value given by:
• the difference value=a second average CQI value for the preferred subset of the first set of subbands−the first average CQI value, and
• wherein the predetermined number of differential CQI values include more differential CQI values for non-negative difference values than differential CQI values for negative difference values.

A mobile station for channel quality information (CQI) in a mobile communication system, the mobile station comprising:

• a transmitter configured to transmit a first average CQI value for a first set of sub-bands and a differential CQI value for a preferred subset of the first set of subbands,
• wherein the differential CQI value is one of a predetermined number of differential CQI values and indicates a difference value given by:
• the difference value=a second average CQI value for the preferred subset of the first set of sub-bands−the first average CQI value, and
• wherein the predetermined number of differential CQI values include more differential CQI values for non-negative difference values than differential CQI values for negative difference values.

A base station for receiving channel quality information (CQI) in a mobile communication system, the base station comprising:

• a receiver configured to receive a first average CQI value for a first set of sub-bands and a differential CQI value for a preferred subset of the first set of sub-bands,
• wherein the differential CQI value is one of a predetermined number of differential CQI values and indicates a difference value given by:
• the difference value=a second average CQI value for the preferred subset of the first set of subbands−the first average CQI value, and
• wherein the predetermined number of differential CQI values include more differential CQI values for non-negative difference values than differential CQI values for negative difference values.