TD-LTE — The radio-access solution for IMT-Advanced/TDD

This paper provides a discussion on the LTE radio-access technology as defined in 3GPP, with specific focus on its TDD component (TD-LTE). Some specific characteristics of TDD, such as interference between uplink and downlink as well as channel reciprocity, are outlined. A discussion on possible evolution paths for the TD-LTE radio-access technology is also presented. Finally, an overview of the performance and capabilities of TD-LTE, in relation to the requirements on IMT-Advanced, is provided.