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To exchange the layer 3 messages, i.e. the RRC (Radio Resource Control) and the NAS (Non-Access Stratum) messages between the UE and the 5G network, a signaling connection which is called “RRC Connection” should be established between the UE and the gNB .
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To establish the RRC connection, a Signalling Radio Bearer (SRB) should be configured both in the UE and the gNB. The RRC or NSA messages are carried by the Signalling Radio Bearer.
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For SRB configuration, PDCP, RLC parameters are delivered to the UE by the gNB.
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Based upon which type of the layer 3 messages are going to be exchanged between the UE and the 5G network, a specific type of SRB is configured.
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Here I am trying to depict the RRC connection as logical connection between the UE and the gNB.
- Dedicated Control Channel (DCCH) is used by SRB1, SRB2, and SRB3 for exchanging the dedicated control information between the UE and the 5G network , in both the downlink and uplink.
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