Question: During S15 Session Establishment, what information does the Home NodeB Gateway (HNB GW) include in the CCR (Credit-Control Request) command when sending an INITIAL_REQUEST to the Policy and Charging Rules Function (PCRF)?
Option 1: HNB Local IP address within the HeNB-Local-IP-Address AVP and, if available, the UDP source port number of IPSec tunnel within the UDP-Source-Port AVP.
Option 2: Only the HNB ID in the HeNB-ID AVP for authentication purposes.
Option 3: The entire IPsec tunnel configuration for security setup.
Option 4: Details of all currently attached User Equipment (UE) for simultaneous authorization.
Explanation: This is correct because, according to the specified procedure for S15 Session Establishment, when the HNB GW sends a CC-Request with an INITIAL_REQUEST to the PCRF, it must include the HNB's local IP address (for identification and connectivity purposes) and, if available, the UDP source port number of the IPSec tunnel (to facilitate secure communication setup). This ensures that the PCRF has necessary details for session management and security.