Hello Mahesh,
I believe that that answer is yes. As soon as you have earned the minimum required amount of PDUs you can renew your certification. (I do recommend that you verify this with
customercare@pmi.org).
But please note that this does NOT change your future cycles: Your current cycle is 9 Apr 2016 - 8 Apr 2019 and if you renew early that means that you simply "complete" the current cycle. Your next cycle will be 9 Apr 2019 - 8 Apr 2022.
Also note that you cannot "pre-earn PDUs" for the next cycle. PDUs that you earn before 9 Apr 2019 do NOT count for the next cycle. There are some exceptions to this rule, but generally speaking, if you renew your credential early, then it is best to wait with earning your next PDUs until your new cycle begins.