Abstract
To keep pace with the rapidly increasing demands being placed on mobile radio systems and
data traffic, the 3rd Generation Partnership Project (3GPP) has standardized a further
development of UMTS. The successor to UMTS is referred to as long term evolution (LTE) and
will permit more powerful and more spectral-efficient mobile radio transmission. LTE uses both frequency division duplex (FDD) and time division duplex (TDD) as duplex modes. This article describes the LTE TDD (or TD-LTE) technology in detail and highlights any differences from the LTE FDD technology. Special characteristics and specific challenges to be faced during network planning are also described.

By Maria Djanatliev.