lte DL simulation sib

hey guys, I am trying to simulate a full lte DL connection I have synced and read the mib so now I can read the entire bandwidth

now im trying to read the sib1

I have inserted random bits as the sib1 and read it successfully but I don't know how to insert a true sib message so I can continue to read sib 2

also how do I insert a real sib 2 message

I have the lte toolbox but no examples in the matter

would appreciate any help