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LTE RACH/RRC Call Flow & PRACH Parameter Details, RA-RNTI, SIB2 | 4G E2E Signaling Session 2

Mohamed ELAdawi

Mohamed ELAdawi

— 1 min read
LTE RACH/RRC Call Flow & PRACH Parameter Details, RA-RNTI, SIB2 | 4G E2E Signaling Session 2

Welcome to Session 2 of the 4G End-to-End Course.

In this video, we break down the LTE Random Access Procedure (RACH) step by step and explain how the UE moves from downlink synchronization to uplink synchronization before starting the connection setup process.

This session covers the complete RACH overall overview, RACH types, and call flow explanation, including:

  • Contention-Based Random Access (CBRA)
  • Contention-Based Random Access (CBRA)
  • PRACH detailed call flow
  • UE identities overview
  • RA-RNTI explained
  • How UE finds the correct RAR
  • System Information acquisition recap
  • SIB2 content and RACH-related parameters
  • PRACH frequency offset
  • PRACH configuration index
  • PRACH format Root Sequence Index
  • Preamble information parameters
  • Preamble power ramping
  • RA supervision parameters
  • RACH MSG1, MSG2, and MSG3 content
  • RRC Setup call flow

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5G HARQ Explained: Soft Combining, HARQ Processes, ACK/NACK Timing, Codebook Types, Spatial Bundling, and 4G vs 5G Differences (Article)

5G HARQ Explained: Soft Combining, HARQ Processes, ACK/NACK Timing, Codebook Types, Spatial Bundling, and 4G vs 5G Differences (Article)

Introduction * HARQ is one of the most important reliability mechanisms in the 5G MAC layer. It directly affects retransmission speed, uplink control overhead, latency, and overall scheduling efficiency. * In simple words, HARQ gives 5G a fast retransmission loop. It helps recover transmission errors much faster than higher-layer recovery, which is

By Mohamed ELAdawi