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5G supports various duplexing schemes like FDD, TDD, semi-static TDD, static TDD and dynamic TDD.
Can someone explain me what are the differences in TDD, semi-static TDD, static TDD and dynamic TDD?
In Static-TDD, transmission and reception of data occur at the same frequency band, through allocating distinct time slots for UL and DL. The transmission bandwidth of each one of the links is fixed depending on average traffic load. In Static TDD, there will be a DL time slot where only DL data is sent and a UL time slot where only UL data is sent.
Hence, Static TDD will always avoid the interference between DL and UL.
Semi-static TDD configuration includes: an initial portion for downlink transmission; a flexible portion; and a terminal portion for uplink transmission. TDD structure of the flexible portion may be determined later by transmission of dynamic physical layer configuration information such as downlink control information (DCI) and/or slot format indicator (SFI).
Dynamic TDD allows adjustments of uplink (UL) and downlink (DL) resources flexibly. Through allocating unique time slots for UL and DL just like S-TDD, we can send and receive data on the same frequency band. However, with Dynamic TDD, the DL and the UL bandwidths vary according to instantaneous traffic load.
It enables efficient and flexible asymmetric services, which improves the spectral efficiency. Nevertheless, Dynamic TDD induces interference between DL and UL.