Question: What is the primary purpose of the Neighbouring UMTS Cell Information Extension IE in UTRAN's Iur interface RNSAP signalling?
Option 1: To indicate additional neighbouring UMTS cells when the maximum number of neighbouring RNCs (maxNrOfNeighbouringRNCs) is exceeded.
Option 2: To replace the Neighbouring UMTS Cell Information IE for all neighbouring cell indications.
Option 3: To signal the quality of service (QoS) parameters for neighbouring UMTS cells.
Option 4: To initiate handover procedures between UMTS and non-UMTS networks.
Explanation: The Neighbouring UMTS Cell Information Extension IE is utilized to provide information about additional neighbouring UMTS cells, specifically in scenarios where the number of neighbouring RNCs surpasses a predefined maximum, thus ensuring comprehensive neighbour cell awareness without being limited by the maximum neighbour RNC count. This is crucial for efficient network planning, handovers, and overall network performance optimization.