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4) Change Management Scheduler

1. Impacted components: OOF, VID
2. Contributors: AT&T
3. Functionalities
   
   1. Discover schedule based on the change management constraints
   2. Constraints
      
      1. Time-based - e.g., execute the change activity during the maintenance window and weekdays
      2. Concurrency of how many NF instances to change at a time - this is concurrency within a single user request
      3. NF conflicts (if time permits) - avoid work scheduled at the same time on the same NF instance
   3. Input
      
      1. List of NF instances - request details as depicted in the Beijing script
      2. Start/end times
      3. Expected duration
      4. Constraint/policy
      5. Type of change (workflow name)
      6. Concurrency value
   4. Output
      
      1. Schedule - time and instance at which the workflow would be executed

4. Integration/Testing plan

   1. Schedule a VNF instance at specific time to execute the change management workflow

   2. Use Beijing vGW in-place software upgrade to demo execution at a specific timebased on the schedule output by OOF

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