Howtosignalprocessing
- What is Msg1 in 5G?
- What is preamble in 5G?
- What is root sequence index in 5G?
- Why does a UE need to perform Rach when first setting up with the gNB?
What is Msg1 in 5G?
Msg1 : Random Access Preamble (RA) Msg2 : Random Access Response (RAR) Msg3 : RRC Connection Request. Msg4 : Contention Resolution.
What is preamble in 5G?
In 5G initial access/PRACH preamble of a UE to a base station requires uplink synchronization between the sender and the receiver to obtain orthogonality, a PRACH preamble signature with a specific pattern is assigned to a UE, after being synchronized with each other message communication can be done.
What is root sequence index in 5G?
Root Sequence Index - Sets the root sequence index for the selected PRACH. The root sequence index is consecutive to 837 when LRA1) Random Access, or 2) Receiver Address = 839 and to 137 when LRA = 139. Zero Correlation Zone Config - Sets the number of Root Sequences required per cell for the selected PRACH.
Why does a UE need to perform Rach when first setting up with the gNB?
When we want to connect a UE to 5G network, it has to synchronize in downlink as well as in uplink. Downlink synchronization is obtained after successfully decoding SSB, In order to establish uplink synchronization and RRC connection, UE has to perform RACH random access procedure.
