NS scaling - VNF level event

Change-Id: I690954e7594213ee14a3242fb89d442bf90e2cb6
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

diff --git a/Release2/NS_scaling.md b/Release2/NS_scaling.md
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+# NS Scaling #
+
+## Proposer ##
+- Gerardo Garcia (Telefonica)
+
+## Type ##
+**Feature**
+
+## Target MDG/TF ##
+UI, SO, RO, VCA
+
+## Description ##
+This feature captures the need of NS scaling use case, as discussed in
+different TSC+MDL calls. The description below is a first idea to be
+elaborated and discussed further.
+
+A NS will have defined, as part of the descriptor, different ordered scale
+steps, starting from number 1. For each step different groups of VNFs and VLDs
+will be required.
+
+For simplicity, the feature will assume that the trigger will be manual by
+the network operator, using the UI. The trigger will specify to which scale step
+the NS will move.
+
+The action will reach the SO, which will identify the incremental additions
+required in the RO and in the VCA. First, the actions to be done in the RO will be
+executed, and later, the ones in the VCA.
+
+Rollback mechanisms should be implemented E2E accross mechanisms.
+
+Regarding the interaction between SO and RO, the following mechanism is proposed:
+- The SO will turn scaling-up of a single NS events into new RO Network Scenarios
+and will orchestrate them in RO.
+- The SO will turn scaling-down events into Network Scenario terminations in RO.
+- The SO will keep control of the different RO Network Scenarios that belong to
+a NS in the SO.
+
+## Demo or definition of done ##
+N/A
+
+