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Introduction to RACH Procedure in 5G

This video explains how a UE establishes its initial connection using RACH procedure in 5G. ▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬ 0:00 - Introduction 0:39 -SSB Burst 2:21 - RACH Transmission (Message 1) 2:41 - Zadoff Chu Sequences 5:05 - Timing Advance Command (Message 2) 5:26 - RRC Connection Request (Message 3) 5:40 - Contention Resolution (Message 4) 7:53 - Contention Free RACH procedure Correction: 6:18 - UE sends ue-identiy in "RR Connection Request" (Msg3), not TC-RNTI. ue-identiy is typically a random number, hence it will be different for UE 1 and UE 2. Base Station selects one of the ue-identity and sends it over "Contention Resolution" (Msg4). UE matches received ue-identity with its own ue-identity to check if its RACH attempt is a Success or Failure. References: 1. ETSI TS 138 211 2. ETSI TS 138 321 3. Textbook “5G New Radio in Bullets” by Chris Johnson 4. ShareTechNote: https://www.sharetechnote.com/html/5G... 5. TechPlayOn: https://www.techplayon.com/5g-nr-rach... Music: Erik SATIE - Gymnopedies 1 #5G, #RACH, #Wireless, #WirelessCommunication, #CellularCommunication