Method and apparatus for transmitting and receiving system information in a mobile communication system

A method for transmitting system information by a Node B in a mobile communication system, the method comprising:

• providing first partial bits and second partial bits of a system frame number (SFN);
• and
• transmitting the system information comprising the first partial bits of the SFN on a broadcast channel in a first subframe of a radio frame within a broadcast channel transmission period,
• wherein the first partial bits have the same value during one broadcast channel transmission period comprising a plurality of radio frames,
• wherein the second partial bits of the SFN are acquired by decoding the broadcast channel, and have different values for different radio frames within the broadcast channel transmission period, and
• wherein the SFN is determined from the first partial bits and the second partial bits.

A Node B for transmitting system information by a Node B in a mobile communication system, the Node B comprising:

• a controller configured to first partial bits and second partial bits of a system frame number (SFN);
• and
• a transceiver configured to transmit the system information comprising the first partial bits of the SFN on a broadcast channel in a first subframe of a radio frame within a broadcast channel transmission period;
• wherein the first partial bits have the same value during one broadcast channel transmission period comprising a plurality of radio frames,
• wherein the second partial bits of the SFN are acquired by decoding the broadcast channel, and have different values for different radio frames within the broadcast channel transmission period, and
• wherein the SFN is determined from the first partial bits and the second partial bits.