Question: In a shared RAN scenario with multiple cell ID broadcast, how is a UE-associated signalling connection associated with an F1-C interface instance between gNB-DU and gNB-CU?
Option 1: By allocating a common Transaction ID for all UEs on the same physical radio resources.
Option 2: By allocating unique values for both gNB-DU UE F1AP ID and gNB-CU UE F1AP ID, mapping them to the specific F1-C interface instance.
Option 3: Through dynamic setup of multiple F1-C interface instances for each UE, based on PLMN association.
Option 4: By broadcasting all signalling connections over a shared F1-C interface instance without unique identifiers.
Explanation: This is correct because, in the context of RAN sharing with multiple cell ID broadcast, associating a UE's signalling connection to an F1-C interface instance requires unique identifiers (gNB-DU UE F1AP ID and gNB-CU UE F1AP ID) to ensure proper mapping. This approach allows for efficient management of shared resources while maintaining the integrity of individual UE connections across different PLMNs.