Question: In a Wireless and Wireline Convergence Access Support for the 5G System (5GS), which entity is responsible for managing the mapping and interworking between 5G QoS and wireline access network resources on behalf of the Fixed Network-Radio Gateway (FN-RG)?
Option 1: Fixed Network-Radio Gateway (FN-RG) itself
Option 2: Wireline Access Gateway Function (W-AGF) for both FN-CRG and FN-BRG
Option 3: Wireline Access Gateway Function (W-AGF) on behalf of the FN-RG, with specifications varying by resource type (e.g., CableLabs for FN-CRG, BBF for FN-BRG)
Option 4: 5G Core Network (5GC) directly
Explanation: The correct answer is Option 3 because the FN-RG does not support 3GPP signalling, necessitating the W-AGF to manage QoS mapping and interworking. Additionally, the specifications for this mapping are provided by different organizations (CableLabs for FN-CRG and BBF for FN-BRG), highlighting the variability in resource management based on the type of resource (FN-CRG vs. FN-BRG). This requires a nuanced understanding of how QoS is managed across converged access networks in 5GS, particularly when involving fixed network elements that don't natively support 3GPP signalling.