Question: What is the primary function of the E-RGCH and E-HICH Channelisation Code Validity Indicator parameter in UTRAN's Iur interface RNSAP signalling?
Option 1: To dynamically adjust the transmission power of E-DCH FDD DL Control Channels.
Option 2: To indicate whether the E-RGCH/E-HICH Channelisation Code IE should be ignored within the E-DCH FDD DL Control Channel Information IE.
Option 3: To select the appropriate modulation scheme for E-RGCH and E-HICH channels based on channel conditions.
Option 4: To trigger the reconfiguration of the E-DCH FDD DL Control Channel structure in response to handovers.
Explanation: The correct answer highlights the parameter's role in signaling whether the E-RGCH/E-HICH Channelisation Code IE should be considered valid or ignored within the context of the E-DCH FDD DL Control Channel Information IE, ensuring proper channel configuration and seamless UTRAN network communication. The other options describe unrelated functions involving power adjustment, modulation scheme selection, and handover-induced reconfiguration.