name: PRACH
full_form: Physical Random Access Channel
context: for other system information (SIB2 and onwards), Paging, Msg.2 ("Message 2", as explained below) and Msg.4 transmissions on the same cell. For random access in NR, a four-step procedure consisting of Msg.1, Msg.2, Msg.3 and Msg.4 is defined. For Msg.1 i.e., PRACH transmission in random access, NR supports two types of PRACH sequences as the preamble sequence: - one is based on long Zadoff-Chu (ZC) sequences of length 839 only applicable to FR1 and - another is based on short ZC sequences of length 139 applicable to both FR1 and FR2. Four different PRACH preamble formats based on the long ZC sequence are defined and corresponding numerology is defined for each PRACH preamble format as shown in Table 5.5.4.3-2. In addition, nine different PRACH preamble formats based on the short ZC sequence are defined and corresponding numerology is defined for each PRACH preamble format as shown in Table 5.5.4.3-3. Msg.2 and Msg.4 for random access are carried by PDSCH that are scheduled by PDCCH.
description: The Physical Random Access Channel (PRACH) is a communication link used in the initial access and mobility procedure of the 5G New Radio (NR) system. It transmits the Msg.1 preamble sequence, initiating random access. PRACH supports long and short Zadoff-Chu (ZC) sequences.
explanation: The text describes PRACH as a communication link facilitating the transmission of data for initial access in the 5G NR system. This function aligns with the definition of a Connection.
section_title: 5.5.4.3	Initial access and mobility
biotag_Context: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,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,B-Network,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,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,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,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,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O
biotag_Description: O,B-Connection,I-Connection,I-Connection,I-Connection,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,B-Technology,I-Technology,O,O,O,O,O,O,O,O,O,O,O,B-Connection,O,O,O,O,O,O,O