Question: In the context of Relocation of Serving Radio Network Subsystem (SRNS), what type of cell identifiers may be conveyed by the Source Cell Identifier Information Element (IE) in a UTRAN Iu interface RANAP signalling scenario?
Option 1: Only Target Cell ID for the destination system
Option 2: Both Source and Target eNodeB IDs for intra-LTE handovers
Option 3: Either GERAN Source Cell ID (for GSM to UMTS relocation) or UTRAN Source Cell ID (for UMTS to GSM relocation)
Option 4: Always the Destination Cell ID of the target RNC
Explanation: The correct answer reflects the scenario where the Source Cell Identifier IE identifies the cell involved in the relocation process from the source system, which can be either a GERAN (GSM) source cell ID for GSM to UMTS relocation or a UTRAN (UMTS) source cell ID for UMTS to GSM relocation, crucial for managing handovers and ensuring seamless connectivity across different radio access technologies.