TDD- Time Division Duplex

Time Division Duplex possesses of the following system characteristics:

Compared with FDD, TDD have no requirements of paired frequency, which is deally for flexible frequency allocation;

The use of the same carrier frequency for both uplink and downlink with identical propagation characteristics is pretty much suitable for implementing smart antenna and other technologies;

TDD facilitates asymmetric traffic, where the transmission rates in up- and downlinks are adjusted dynamically according to the specific requirements of the applications, by adopting the asymmetric switching point, so that the overall bandwidth utilization efficiency can be optimized;

TDD is credited with lower implementation cost of RF transceivers, which do not require high isolation for transmitting and receiving multiplexing as needed in an FDD transceiver;