About TDMA / m-blocks

Hello,

I am working on LTE type physical layer, and I have almost succeeded in
receiving packets. I can transmit up to 10 packets in a frame. I am now
facing a problem when scheduling resources in precise time. When there
is
no data to transmit, the synchronization signal must be sent every time
frame. Is there any way to do uplink/downlink time slot
synchronization. I
saw some posts on m-blocks, but I couldn’t find enough information
whether
it is working and how I can port my codes the new domain. Any help would
be
appreciated.

Regards