August 2021
Intermediate to advanced
288 pages
5h 51m
English
Content preview from NG-RAN and 5G-NR
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3NG-RAN Network – Procedures
3.1. General procedure of the 5G-NSA mode
The initial deployment of the 5G service is based on 5G-NSA option 3, also called dual EN-DC connectivity. When the phone is switched on, the mobile starts with a cell search procedure on the 4G/LTE (Long-Term Evolution) radio network. Once synchronized with the eNB (evolved Node Base station), the mobile reads the MIB (Master Information Block) system information carried by the BCCH (Broadcast Control Channel) beacon channel and the SIB (System Information Block) information carried by the PDSCH (Physical Downlink Data Channel) physical channel, in order to acquire the radio parameters of the cell.
After synchronization, the mobile requests a signaling radio bearer to the eNB. A signaling radio bearer (SRB) is used for the transmission of RRC and NAS messages. The establishment of a RRC connection starts via the random access procedure. The procedure is initiated by the mobile and the radio link is controlled by the base station.
During the UE attach, the eNB transmits a radio configuration to the UE. The radio configuration is used to define the type of measurements to be performed on the LTE and NR (New Radio) radio accesses for dual connectivity.
When the UE requests dedicated SRB and DRB (Data Radio Bearer) to exchange message/data with the network, the eNB applies a RRC Connection reconfiguration procedure. This procedure aims to establish a UE context to define a radio identification in the connected ...
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