discrete signals - what's the baseband FFT size of LTE?

In standard of 3GPP LTE physical layer(3GPP TS 36.211), the FFT size for baseband signal generation for both Dl and UL is 2048 and CP size is also determined. However there is a table in several resources said we have different FFT and CP size. E.g.

http://lteuniversity.com/ask_the_expert/f/59/t/405.aspx

How is it possible?