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In this paper, we perform a survey on new Third Generation PartnershipProject (3GPP) Long Term Evolution-Advanced (LTE-Advanced)enhancements,covering the technologies recently adopted by the 3GPP in LTERelease 11 and those being discussed in LTE Release 12. In more details, weintroduce the latest enhancements on carrier aggregation (CA), multiple-inputmultiple-output (MIMO) and coordinated multi-point (CoMP) as well asthree-dimensional (3D) MIMO. Moreover, considering that network nodes willbecome very diverse in the future, and thus with heterogeneous network (HetNet)being a key feature of LTE-Advanced networks, we also discuss technologies ofinterest in HetNet scenarios, e.g., enhanced physical data control channel(ePDCCH), further enhanced inter-cell interference coordination (FeICIC) andsmall cells, together with energy efficiency concerns. In particular, we payspecial attention to one of the most important enhancements in LTE Release 12,i.e., dynamic time division duplex (TDD) transmissions, and present performanceresults that shed new light on this topic.

Enhancements of the 3GPP LTE-Advanced and the Prized Asset: Dynamic TDD Transmissions