name: ACK
full_form: Acknowledgement
context: As a result of the DL enhancement of pilot-free slot-format, the DL DPCCH only carries TPC bits. A new field could be introduced in the DL slot-format to carry the Ack. This would increase the code-rate on the DTCH, but avoid having to reserve an OVSF code for the ACK channel. Alternatively, the ACK could be I-Q multiplexed with the TPC symbols, since the TPC symbols always have identical I and Q bits. In either case, the choice of modulation scheme for the ACK symbol â BPSK or on-off keying â should be investigated, based on the achieved UL FET statistics and the ACK power required in each case. The ACK transmit power is computed by applying a configurable offset to the DPDCH power, similar to the currently configured DPCCH/DPDCH power offsets. If a separate field is introduced in the DL slot format for ACK channel, then the choice of the width of this field must be studied. A longer ACK duration increases the ACK delay, which erodes the gains from UL FET, and also increases the
description: The Acknowledgement (ACK) is a message used in the downlink (DL) direction to acknowledge the receipt of data. In the context of the DL enhancement of pilot-free slot-format, the ACK can be carried as part of the DL DPCCH or introduced as a new field in the DL slot-format. The modulation scheme for the ACK symbol and its transmit power are also important considerations.
explanation: The abbreviation 'ACK' is classified as a Message based on the context provided, which discusses the transmission and reception of acknowledgement messages in the downlink direction. The context highlights the importance of the ACK message in the DL enhancement of pilot-free slot-format and the need to investigate its modulation scheme and transmit power.
section_title: 4.2.3.1	Option 1: ACK as part of DL DPCCH
biotag_Context: O,O,O,O,O,B-Connection,O,O,O,O,O,B-Connection,B-Connection,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,B-Message,O,O,O,B-Message,O,O,O,O,O,O,B-Protocol,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,O,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,B-Connection,B-Procedure,O,O,O,B-Message,O,O,O,O,O,O,B-Message,O,O,O,O,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Connection,O,O,O,B-Message,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,O,O,O,B-Message,O,O,O,O,O,O,B-Connection,O,O,O,O,O
biotag_Description: O,B-Message,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O,B-Message,O,O,O,O,O,O,O,B-Connection,B-Connection,O,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O,O,B-Message,O,O,O,O,O,O,O,O,O