Question: What does the FDD S-CCPCH Frame Offset IE signify in the context of UTRAN's Node B Application Part (NBAP) signalling?
Option 1: The absolute System Frame Number (SFN) value for a cell's P-CCPCH on the Uu interface.
Option 2: The constant difference between an S-CCPCH's Connection Frame Number (CFN) and the least significant 8 bits of a cell's P-CCPCH's System Frame Number (SFN) on Uu.
Option 3: A variable offset used for synchronizing S-CCPCH frames across different cells in a UTRAN network.
Option 4: The total number of frames transmitted on an S-CCPCH since the last SFN reset.
Explanation: This is correct because the FDD S-CCPCH Frame Offset IE represents the constant frame offset between an S-CCPCH's CFN and the least significant 8 bits of the P-CCPCH's SFN in a cell, crucial for maintaining synchronization and proper frame alignment within UTRAN networks.