Policy

Question 1

Triggers

Answer 1

Entry points when invoking the Rule Engine​

Question 2

Rule Groups

Answer 2

A set of Rules that are evaluated in sequence by the Rule Engine​

The evaluation of Rules that are part of a Rule Group stops at the first rule that is matching its defined conditions​

Several Rule Groups can be associated to a Trigger which are all evaluated in sequence​

Rule Groups can be nested (invoking a Rule Group from a Rule of another Rule Group) ​

Question 3

Rules

Answer 3

Logical constructions of type IF (condition/conditions) THEN (action/actions)​

Conditions are logical expression that are evaluating Criteria Attributes​

Actions are software functions to be executed having or not parameters that will drive their execution.​

Question 4

Rule Variables

Answer 4

Local variable inside a Trigger that can be evaluated in conditions and be set in actions.​

Question 5

Rule System Version (RSV)

Answer 5

A Rule Engine’s environment composed of a set of Rule Groups associated to Triggers having inside Rules and/or Rule Variables and/or Default Actions.
A RSV is stored in the SPS DB from where it can be loaded into the Rule Engine’s cache memory.​
Several RSVs can exist in the SPS DB, but only one will be loaded at a certain time in the Rule Engine’s cache, the so called active RSV.

Question 6

SPS-Policy provides tailored policy based on a wide variety of inputs. Some of the inputs include:

Answer 6

• subscription type
• type of device
• location; based on MCCMNC, GGSN IP address, cell tower
• configured device data
• time of day/day of week
• usage related policies
• OCS Spending Limits updates

Question 7

When SPS-Policy reacts to an event, such as an incoming Diameter message, there is an
opportunity to provide a customized policy decision using the SPS-Policy rules. When the event
occurs, such as an incoming Rx message from an application, SPS-Policy evaluates the rules
associated with the event. The rules have access to a wide variety of information on which to base
the policy decision, including the following:

Answer 7

• AVPs from a message can be evaluated using customized rules resulting in unique policy
decisions
• subscriber-related data; internal SPR record, or a cache/retrieved external SPR record
• existing IP-CAN session (if present) and its attributes
• existing Sy session (if present), OCS counters and their states
• existing AF session (if present), media types and flows
• custom data fields