Question: In which dual connectivity scenario is Signaling Radio Bearer 5 (SRB5) supported, according to 3GPP specifications?
Option 1: EN-DC (E-UTRA-NR Dual Connectivity)
Option 2: NR-DC (NR Dual Connectivity)
Option 3: NGEN-DC (NG-RAN E-UTRA-NR Dual Connectivity)
Option 4: NE-DC (Non-E-UTRA NR Dual Connectivity)
Explanation: SRB5 is specifically supported in NR-DC (NR Dual Connectivity) scenarios, as per the 3GPP specifications. This is because NR-DC allows for the direct communication and control between NR nodes, facilitating the use of SRB5 for sending RRC messages, including application layer measurement reports, directly to the Secondary Node (SN). In contrast, EN-DC, NGEN-DC, and NE-DC do not support SRB5, highlighting the unique operational capabilities of NR-DC in managing signaling efficiently across connected nodes.