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In previous chapter we shall learned about RRU, BBU, CU, DU fronthaul, midhaul; In this chapter we shall learn about: D-RAN C-RAN cloud RAN…

Fronthaul, Midhaul and Backhaul are used to connect RU, DU and CU and the core network together. They tells us about the transport network…

In this chapter we shall have a look at the functionalities of different RRC States. There are 3 RRC states in 5G NR. 1. RRC Connected 2. RRC…

PDCCH Order will be initiated by network to trigger a Random Access procedure. This is initiated when there is an upstream loss. When gNB has…

UE access procedure is as below: Step 1: UE is Switched ON Step 2: PLMN Selection PLMN Introduction PLMN stands for Public Land Mobile…

Cell Search and Cell Selection 1. When a UE is powered on, it searches for a specific frequency according to Synchronization Raster as defined…

In this chapter we shall see which RRC messages can be sent: 1. RRC messages can be sent Unprotected prior to AS security activation. 2. RRC…

In this previous chapter we learnt about 5G NR initial access process in brief. In this chapter we shall see the important message contents.…

In this chapter we shall learn about 5G NR initial access process in brief. 1. UE sends RRC connection request message to gNB-DU. 2. gNB-DU…

SRB are used to carry RRC and NAS messages. There are 4 different types of SRB in 5G NR. SRB0: It is used to transmit RRC messages on the…