name: DAI
full_form: Downlink Assignment Index
context: In the DCI formats to be used by the SS, TTCN may set the DAI fields explicitly or may configure the SS to set the DAI fields automatically. TTCN configures the DAI parameters in the SS according to one of the columns of Table 7.1.2.1.3.3-1. Table 7.1.2.1.3.3-1: DAI parameter settings When TTCN configures the SS to use the automatic mode, the SS shall: - Create DL association/transmission set, according to the setting by TTCN of TimeDomain, PdschHarqTimingIndicator and PucchResourceIndicator for DCI formats 1_x, their associated transmission timing information, and the set of serving cells configured, then - Identify the need to multiplex a HARQ-ACK codebook into a PUSCH transmission according to above DL association/transmission set and the transmission timing information of received UL Grant(s), then - Set the DAI fields in the DCI formats 1_x and 0_1 according to the above and the requirements on DAI values specified in TS 38.213 [21] clause 9.1.2 for semi-static HARQ-ACK Codebook
description: The Downlink Assignment Index (DAI) is a parameter used in the configuration of the Secondary Cell (SC) in a Dual Connectivity (DC) scenario, specifically for setting the DAI fields in DCI formats. It is utilized by the gNB to inform the UE about the downlink assignment and transmission timing information.
explanation: The text describes DAI as a parameter used for configuring the Secondary Cell within a Dual Connectivity scenario. This role aligns with the definition of a parameter as a configurable element within a telecommunications system.
section_title: 7.1.2.1.3.3DAI
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