Question: In UTRAN Iub interface, what does the Binding ID primarily identify in the context of transport bearer establishment with ALCAP?
Option 1: A specific Node B within the network
Option 2: A unique user data stream for each transport bearer under establishment
Option 3: The Transport Layer protocol (e.g., TCP, UDP) used for user plane transport
Option 4: The IP address allocated to the User Equipment (UE)
Explanation: The Binding ID serves as an identifier for a user data stream. Specifically, in scenarios involving transport bearer establishment with ALCAP, it uniquely identifies each transport bearer to/from the Node B, ensuring proper routing and management of user data streams within the network.