Question: In a Location Services (LCS) scenario, if a target UE is reachable but positioning fails, what action does the VMSC, MSC Server, or SGSN take if the LCS client has requested 'last known location' and notification to the UE doesn't apply or was successful?
Option 1: Ignore the 'last known location' request and return a failure response.
Option 2: Initiate a new positioning attempt using a different positioning method.
Option 3: Include the 'last known location' with its timestamp in the response to the LCS client's request.
Option 4: Forward the request to another network entity for further processing.
Explanation: When the target UE is reachable but positioning fails, and if the LCS client has specifically requested 'last known location' with no applicable or successful notification to the UE, the VMSC, MSC Server, or SGSN utilizes available historical data. By including the 'last known location' along with its timestamp in the response, these entities provide the most relevant information available under the circumstances, balancing between the failure of real-time positioning and the client's defined requirements.