Question: In a UTRAN Iub interface, when a CRNC sends a RESET REQUEST message with the Reset Indicator IE set to 'Communication Context' to a Node B, what action does the Node B take regarding the indicated Node B Communication Contexts?
Option 1: The Node B updates the indicated contexts with new radio resources and retains the existing user plane transport bearers.
Option 2: The Node B removes the indicated contexts, releases associated radio resources, and initiates release of involved user plane transport bearers.
Option 3: The Node B suspends the indicated contexts temporarily without altering allocated radio resources or user plane transport bearers.
Option 4: The Node B ignores the RESET REQUEST for 'Communication Context' and only responds with a RESET RESPONSE acknowledging receipt.
Explanation: When the Reset Indicator IE is set to 'Communication Context', the Node B is instructed to clear all resources associated with the specified contexts. This includes removing the indicated Node B Communication Contexts, releasing the allocated radio resources for these contexts, and initiating the release of user plane transport bearers that were involved. This comprehensive clearing ensures a clean state as per the CRNC's request, highlighting the importance of resource management in UTRAN operations.