name: AICH
full_form: Acquisition Indicator Channel
context: are kept within the same sub-channel. The repetitions would then be 12 access slots apart. The duration between subsequent preamble attempts varies. - Number of Repetitions and AICH Transmission Two proposals on potential AICH transmission schemes are defined below. AICH Scheme 1: The AICH is only transmitted once, after the very last transmitted preamble repetition. The legacy timing between the very last transmitted preamble and the AICH is kept. In this scheme the device would always transmit a pre-defined number of preamble repetitions. This is applicable to all schemes. AICH Scheme 2: The AICH can be transmitted after each of the transmitted preamble repetitions. The legacy timing between the most recent transmitted preamble repetition and the AICH is kept. In this way the device can abort preamble repetitions as soon as it gets a response on the AICH. This is potentially applicable to scheme 3 only. One advantage of AICH scheme 1 is that it keeps the false detection rate to a
description: The Acquisition Indicator Channel (AICH) is a channel used in Random Access procedures to transmit indicators related to preamble repetitions. It manages the interaction between user equipment and the base station during initial access.
explanation: AICH is classified as a Channel because it facilitates communication by transmitting specific indicators (related to preamble repetitions) within the context of Random Access procedures.
section_title: 6.1.3.5.2	Considerations on the PRACH preamble repetition schemes
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