Can We Request Early Descent ?

Hi Every one...
Yesterday i was flying "in the Sim ofcourse" my jet...at Flight level 380...and according to my descent calculations i figured out that i should start my descent at 110N.M from touch-down.
I was waiting for the controller to initiate the order...he gave my a late descent clearence in which i was high and short and started my descent at a high rate with half spoilers extended to catch the descent path.
the question is : is it possible to ask for a descent once you think you are ready for a descent "and your Descent and Approach checklist is complete...Lol".Or you have to wait for the ATC ?
thanks in advance for the replayes and answers.
Regards.
Yesterday i was flying "in the Sim ofcourse" my jet...at Flight level 380...and according to my descent calculations i figured out that i should start my descent at 110N.M from touch-down.
I was waiting for the controller to initiate the order...he gave my a late descent clearence in which i was high and short and started my descent at a high rate with half spoilers extended to catch the descent path.
the question is : is it possible to ask for a descent once you think you are ready for a descent "and your Descent and Approach checklist is complete...Lol".Or you have to wait for the ATC ?
thanks in advance for the replayes and answers.
Regards.