5G NR

Msg3 and Msg4 are used for contention resolution. The uplink time synchronization are completed in Msg1 and Msg2. The purpose of Msg3 and Msg4…

This is the 2nd step in RACH procedure. In this chapter we shall understand below 2 points: 1. How does a UE receive Msg2 ? 2. What are the…

Once the RACH configuration and preambles are selected, it is to be sent out to the available PRACH occasion. For that RA-RNTI is to be…

In previous 2 chapters, we had a a brief of RACH procedure. In the next chapters we shall have indepth understanding of all the messages. In…

In this chapter we shall see where the UE can get the resources for PRACH transmission. Before UE can send a PRACH, it needs to select an SSB…

In this chapter we will look into Rel-15 RACH procedure in brief. In upcoming chapters we shall have a look indetail about the message…

RACH: Random Access procedure is used for uplink synchronization and RRC Connection. UE will get downlink synchronization after successfully…

SIB4: SIB4 contains information relevant for inter-frequency cell re-selection (i.e. information about other NR frequencies and…

SIB3 is OSI It provides neighboring cell related information related to intra-frequency cell re-selection. Includes cells with specific…

SIB2 contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selection as well as…