name: SRB
full_form: Source Route Bridge
context: setup message. Editorâs Note: How does the NR security capabilities get passed to the MeNB if the UE either connects or hands over to a legacy eNB (i.e. one that does not understand the NR security capabilities) between becoming active and the bearer being established on the SgNB. Step3, the eNB will send AS SMC to the UE after selecting eNB security capability, while the NR security capability shall be stored at eNB for future use. Step6, when M-eNB decides to perform EN-DC, the UE NR security capability will be transferred to S-gNB through NR addition Request message. Step7, S-gNB selects UP security capability based on received UE NR security capability and the priority list, then sends the select security capability in NR addition Request Acknowledge message in step 9. Options for Signalling Radio Bearer or SRB termination: The SRB termination for EN-DC is shown in the figure 5.4.4.12.2-4. Figure 5.4.4.12.2-4: SRB termination: MCG SRB, MCG split SRB and SCG SRB For the MCG SRB and
description: The Signalling Radio Bearer (SRB) is a connection used for transmitting control plane information between network elements in an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). It is responsible for carrying signalling messages, such as those related to security capabilities and bearer establishment.
explanation: Based on the context from 3GPP TS 33.899, SRB is classified as a Connection because it refers to a specific communication link used for transmitting control plane information between network elements in E-UTRAN.
section_title: 5.4.4.12.2	Solution details
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