LTE-A using GNU Radio in USRP

Dear all,
I have started some LTE phy work. My long term plan is to develop it
using GNU radio in USRP to transmit and receive information.However, I
have not found suitable code for LTE phy layer on GNU Radio .
If you have any already code,Would you please give me some information
about your code.
Thank you for your help.

Wood