Question: During a RAB Assignment procedure in UTRAN Iu interface (RANAP signalling), if relocation becomes necessary, how does the RNC handle already established or modified RABs not yet reported to the Core Network (CN)?
Option 1: The RNC terminates the RAB Assignment procedure for these RABs with a 'Relocation triggered' cause.
Option 2: The RNC continues the RAB Assignment procedure without interruption for these RABs.
Option 3: The RNC releases all established or modified RABs before initiating relocation.
Option 4: The RNC terminates the RAB Assignment procedure indicating successful RAB configuration modification for these RABs in a single RAB ASSIGNMENT RESPONSE message.
Explanation: When relocation becomes necessary during a RAB Assignment procedure, the RNC handles already established or modified RABs (not yet reported to the CN) by terminating the RAB Assignment procedure with an indication of successful RAB configuration modification for these specific RABs in one message, ensuring a clean handover and minimizing disruptions.