name: ACK
full_form: Acknowledgement
context: the signalling of DL-only, UL-only, and DL+UL TCI state update). Central to the Rel-17 TCI framework is the use of common beam for UE-dedicated PDCCH and the associated PDSCH intended to streamline multi-beam operation. While Rel-15/16 supports the use of common beam for UE-dedicated PDCCH and the associated PDSCH, beam indication is performed via MAC-CE. The latency and overhead associated with MAC-CE potentially detract the application of NR for high-speed scenarios in the FR2 regime. In Rel-17, such latency and overhead are reduced with the introduction of DCI-based beam indication using the existing DCI formats 1_1/1_2 (with and without DL assignments) via the TCI field. To ensure that the NW and the UE are aligned in terms of TCI state, an ACK mechanism for the beam indication is supported either via the ACK associated with the PDSCH (when beam indication is accompanied with DL assignment) or an ACK mechanism analogous to that used for SPS PDSCH release (when beam indication is
description: An acknowledgement message in telecommunications, specifically within the context of 3GPP specifications, refers to a signaling message sent by a receiver to indicate successful receipt of data. In this case, the ACK mechanism is used for beam indication in the NR (New Radio) framework, ensuring alignment between the network and user equipment on TCI state.
explanation: The text describes an 'ACK mechanism' used for beam indication, which is a signaling message sent to acknowledge receipt of data. This aligns with the definition of a Message entity type within telecommunications.
section_title: 11.1	Further enhancements on MIMO for NR
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