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MATRIXX Policy
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.
Spending Limit Control
Spending limit control is managed by the Nchf_SpendingLimitControl service (N28) which enables the Network Function (NF) to retrieve policy counter status information from the Charging Function (CHF).

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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.
  - Spending Limit Control
    Spending limit control is managed by the Nchf_SpendingLimitControl service (N28) which enables the Network Function (NF) to retrieve policy counter status information from the Charging Function (CHF).
  - 5G Policy Configuration
    MATRIXX Charging Application and MATRIXX Policy Application use policy configuration components for charging and rating.
  - Implementing MATRIXX on an EPC/5GC Hybrid Core Network
    If your environment uses a Policy Control Function (PCF)/Policy and Charging Rules Function (PCRF) combination, you can configure MATRIXX to create a 5G session and as circumstances require, switch it to a 4G session or to create a 4G session and switch it to a 5G session. This strategy requires your subscribers to use dual-core evolved packet core (EPC)/5G user equipment.
- 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 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

Spending Limit Control

Spending limit control is managed by the Nchf_SpendingLimitControl service (N28) which enables the Network Function (NF) to retrieve policy counter status information from the Charging Function (CHF).

The Nchf_SpendingLimitControl service is part of the CHF which communicates with the PCF. For more information about N28 and N40 communication and 5G Message flows, see MATRIXX 5G Integration.

Re-Evaluating Spending Limit Control Sessions

For Nchf_SpendingLimitControl, when re-evaluating policy and no policy counter is selected, the session is set to an invalid state and is not re-evaluated again. A Subscription Termination Request (STR) is sent. The NF service consumer should reply with a 204 No Content response. The Charging Server receives a Subscription Termination Response and deletes the policy session. If the Charging Server does not receive a response, it resends the STR up to the configured maximum number of times, with a configured delay between each retry. When the max retries has been exhausted, the session is deleted.

To configure the number of retry attempts, answer the following create_config.info question: Global:Session:Policy:Notify:How many attempts?. The default is 1.

To configure the delay between attempts, answer the following create_config.info question: Global:Session:Policy:Notify:How long (in seconds) to wait after each attempt?. The default is 30 seconds.