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MATRIXX Policy
Policy Processing Based on Quota Action
You can configure a product offer so that Spending Limit Control/Sy policy components and Session Management/Gx components are applied when quota is authorized or denied.
Session Management — Gx Policy
You can configure a product offer so that charging policy components are applied only when quota is authorized or only when it is denied.

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MATRIXX Policy
- About MATRIXX Policy
  MATRIXX Policy describes the tasks that must be completed to configure MATRIXX Policy Application functionality and provides overviews, recommendations, and conceptual discussions to help you understand these tasks. In addition, it describes the supported Diameter policy AVPs and MATRIXX Policy Application SubMan APIs.
- 5G Policy Overview
  The MATRIXX Policy Application provides the business logic and integration into a third-party Policy Control Function (PCF) to support real-time policy decisions and rules. It enables your PCF to deliver flexible policy and charging control rules to your 5G network.
- 3G/4G Policy Overview
  The 3G/4G MATRIXX Policy Application provides the business logic to support real-time policy decisions and rules. It allows charging and network quality of service (QoS) to be flexibly and dynamically linked to customer, service, and network parameters.
- 3G/4G Policy Configuration
  Policy configuration in My MATRIXX includes both session management and spending limit configuration.
- 3G/4G MATRIXX Policy Failover
  A MATRIXX Policy failover can be due to a hard failure or can be planned.
- Policy Profile Selection
  During policy profile selection, product offers are evaluated in descending order from highest to lowest priority. Policy profiles are collected for Sy and N28 policy counters, Gx command-level QoS, and N40 TIME_LIMIT and VOLUME_LIMIT usage triggers.
- Policy Processing Based on Quota Action
  You can configure a product offer so that Spending Limit Control/Sy policy components and Session Management/Gx components are applied when quota is authorized or denied.
  - Spending Limit Control — Sy Policy
    You can configure a product offer so that Sy policy components are applied when quota is authorized or denied. You can configure MATRIXX Engine to apply the data and policy changes for the subscription after the next Gy CCR-U is received or you can enable immediate Sy notifications on offer selection changes due to offer purchases and cancelations.
  - Session Management — Gx Policy
    You can configure a product offer so that charging policy components are applied only when quota is authorized or only when it is denied.
    - Gx Policy Trigger on Offer Selection
      After receiving a Gx CCA-I, PCC rules are evaluated and selected.
    - Gx Policy Trigger when Quota Status Changes
      A Gx policy change RAR is sent when the availability of quota changes and impacts the Gy session.
- Spending Limit Policy Counter APIs
  The Sy policy counter APIs include MtxRequestDeviceEvaluatePolicyCounterSet and MtxRequestDeviceQuerySession.
- Diameter AVPs for MATRIXX Policy Application
  MATRIXX Engine supports the Sy and Gx interfaces for policy control.
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Glossary

Session Management — Gx Policy

You can configure a product offer so that charging policy components are applied only when quota is authorized or only when it is denied.

After receiving a Gx CCA-I, PCC rules are evaluated and selected. However, if the Gy session requires that a new policy profile is used because a different product offer was selected, a Gx RAR message is sent to the P-GW if there are changes to the PCC rules based on rating. If the applied product offer changes during a session, Gx policies are re-evaluated after responding to subsequent Gy CCR messages that result in an authorization status change (from authorized to denied or from denied to authorized).

A Gx policy change RAR is sent when the availability of quota changes and impacts the Gy session. When quota is denied in a Gy session, PCC rules might be sent to the P-GW that result in a notification to the subscriber to enable more quota. If additional quota is granted, another Gx RAR is sent to update the PCC rules. You can configure MATRIXX Engine to apply the data and policy changes for the subscription after the next Gy CCR-U is received or you can enable immediate Gx notifications on offer selection changes due to offer purchases and cancelations.

Policy Profile Selection

To configure policy processing when quota is authorized/denied, MATRIXX Support recommends that you create multiple product offers with different priorities and a default offer.

Create a default offer that is a global offer with a policy component only set to the lowest priority. As a global offer, you do not have to create an offer for every subscriber.
Important: When setting the Policy Quota Action Type:
- Do not set this on the default offer. This offer is used at the start of a session and when no other offer is in use.
- If it is unset in one or more other selected offers, it is possible that multiple RARs will be sent that are unrelated to authorizations.
- If it is set on every offer, the CCR will fail.
Create an active subscription offer with usage and policy components. The offer priority should be higher than the default offer priority.

The examples in the following sections apply when the Policy Quota Action Type is Only Apply Policy When Quota Authorized. The message flows would be similar if the Policy Quota Action Type was Only Apply Policy When Quota Denied.