1: Create moving_average, sliding_window, and thresholds global tables in memory.

2: While receiving application id and throughput from Application Director Do

3: Compute moving average of the latest five received throughput and

save them in the moving_average table

4: If next moving average is ready Then

5: Estimate Delay and Throughput out of moving average.

6: Store the estimated QoS values along with application id in the

sliding_window table

7: End If

8: If next window of the ten estimated QoS values is ready Then

9: Set forecasted_qos = Linear regression of ten estimated QoS in t_n + m.

10: End If

11: If slice state of application id is NOT READY Then

12: Calculate QoS values for scale-up and scale-down thresholds

based on forecasted QoS

13: Store thresholds in the thresholds table along with application id.

14: Spawn a new thread to call the function Get_New_Slice() with

the estimated scale-up QoS values and application’s reliability

from the application-slice mapping table as parameters.

15: Else If slice state of application id is READY Then

16: If forecasted_qos > 0 Then

17: Retrieve corresponding scale_up and scale_down thresholds

from the thresholds table

18: If forecasted_qos ≥ scale_up threshold Or

forecasted_qos < scale-down threshold Then

19: Notify Application Director by sending

EXECUTING_SCALABILITY notification to it.

20: Recalculate scalability thresholds based on forecasted QoS

and update the thresholds table.

21: Spawn a new thread to call the function Trigger-Scalability() with

recalculated scale-up QoS values and IP address of slice as parameters.

22: End If

23: Else If forecasted_qos ≤ 0 Then

24: Spawn a new thread to call the function Release_Slice()

with IP address of slice as parameter.

25: End If

26: End If

27: End While

28: Function Get_New_Slice (arguments: QoS values)

29: Invoke Slice Manager to get a new network slice including QoS values as parameters.

30: After “success” notification from Slice Manager, notify

Application Director by sending GOT_NEW_SLICE notification to it.

31: End Function

32: Function Trigger_Scalability (arguments: QoS values, IP address)

33: Invoke Slice Manager to execute scalability with QoS values and IP address

as parameters.

34: After “success” notification from Slice Manager, notify

Application Director by sending FINISHED_SCALABILITY notification to it.

35: End Function

36: Function Release_Slice (arguments: IP address)

37: Invoke Slice Manager to delete a slice with its IP address as parameter.

38: After “success” notification from Slice Manager, delete the

corresponding entries from the global tables of application-slice

mapping, moving_average, sliding_window, and thresholds.

39: End Function