gaga1976
Most ATC'ers have a fair idea of the normal profiles generally flown in order to meet restrictions. So in the main, descent clearances will be given in sufficient time to make good any ATC imposed restriction. This can either be by ATC instructing you to descend now, based on their knowledge of profiles, or as a 'descend when ready' instruction which leaves it up to you to make the move at the right time.
The BEXIL instruction you quote is the same. One is a written version, the other is the RT phraseology required to say the same thing. There are 2 phrases which can be used on the RT.
Descend FL160 to be level by BEXIL, or,
Descend FL160, cross BEXIL level.
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