Communication and method

A signal processor for use in a communication device, the signal processor comprising:

• a perceiving unit configured to acquire an initial scheduled frame number and a current frame number from MAP information;
• an operator unit configured to receive the initial scheduled frame number and the current frame number from the perceiving unit, and calculate a difference between the initial scheduled frame number and the current frame number;
• and
• a determining unit configured to compare the difference between the initial scheduled frame number and the current frame number with a reference value, and set a new scheduled frame number based on a result of the comparison,
• wherein if the difference between the initial scheduled frame number and the current frame number is equal to zero, the determining unit further is configured to determine the current frame number as a scheduled frame number, and
• wherein if the difference between the initial scheduled frame number and the current frame number is larger than the reference value, the determining unit further is configured to determine that the mobile station has normally received the MAP after the scheduled frame due to MAP loss.