FDD

A communication technology that uses separate frequency bands for transmitting and receiving operations. This technique enables simultaneous bi-directional communication by allocating one frequency band for upstream (transmission from the user equipment to the base station) and another distinct frequency band for downstream (transmission from the base station to the user equipment). FDD systems require a frequency band pair to operate, and are commonly used in systems where the traffic load is symmetric, meaning the amount of data sent and received is approximately equal.