eIMTA: Enhanced Interference Mitigation & Traffic Adaptation

eIMTA is one of the features being discussed in 3GPP Rel-12. The pictures above and below provide the details.

As can be seen, at the moment all the eNodeB's associated with a network has to transmit the same UL/DL pattern throughout out the system. With eIMTA, each eNodeB can decide the UL/DL pattern itself depending on the load.

The main challenge would be interference management while using this scheme.

See also, this slideshare presentation for details:

White Paper: Dynamic TDD for LTE-a (eIMTA) and 5G from Eiko Seidel