Dynamic mode switching between beam indication and beam pair indication and UL TCI activation based on explicit indication from GNB

Abstract

Methods and apparatus are disclosed for dynamic mode switching and UL TCI activation between a beam indication and a beam pair indication based on an explicit indication (e.g., scheduling DCI) from a gNB. The WTRU receives a DCI indicating a beam indication pattern, a DL Tx TCI state, a DL Rx TCI state, and a scheduled PDSCH (Physical Downlink Shared Channel). If the beam indication mode indicates a DL Tx beam pair mode, the WTRU receives a scheduled PDSCH by using only a DL Rx TCI state, and activates a first set of UL TCI states associated with the indicated DL Rx TCI state. And the WTRU receives the PDCCH which schedules the PUSCH and the UL TCI state. If the activated beam indication mode is a DL Tx beam pair indication mode, a UL TCI state is indicated for the activated first set of UL TCI states. Additional embodiments are disclosed.

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