Method and apparatus for predicting a frame type

A method of predicting a frame pattern from a plurality of possible frame patterns in a communication system, the method comprising the steps of:

• receiving a plurality of frames (f1, f2, . . . , fN), each frame being either a voice/data frame (V) or an ⅛th rate/DTX frame (D);
• creating a vector B=(b(f1), b(f2), . . . , b(fN)), of length N, wherein b(fx)=−1 when the frame fx is categorized as an ⅛th rate/DTX frame, or b(fx)=1 when the frame fx is categorized as a voice or data frame;
• creating a plurality of vectors based on possible frame patterns (B1, B2, . . . , BN);
• performing a plurality of dot products of B with B1, B2, . . . , BN;
• and
• predicting the frame pattern based on the dot product.

An apparatus comprising:

• means for receiving a plurality of frames;
• means for creating a first vector based on the plurality of frames;
• means for creating a plurality of vectors based on possible frame patterns;
• means for performing a dot product of the first vector with the plurality of vectors;
• and
• means for predicting the frame pattern based on the dot product.