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MATRIXX Policy
3G/4G Policy Configuration
Policy configuration in My MATRIXX includes both session management and spending limit configuration.
Spending Limit Control Policy Configuration
MATRIXX Policy Application monitors balance ranges from balance normalizers. A policy is rechecked when balances are updated or when any attribute of a subscriber or device is updated. MATRIXX Policy Application is optimized to detect if a balance update affects a policy.
Look Ahead Window for Spending Limit Control Policies
As with session management policy control policies, you can configure a look ahead window for spending limit control policies. The look ahead window allows the Policy and Charging Rules Function (PCRF) or Policy Charging Function (PCF) to determine whether any policy changes are to occur within a configurable time period. With the look ahead window, the Charging Server evaluates the current policies and the next policy change to occur within the look ahead window, which it returns in its reply to the PCRF/PCF.

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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.
  - Session Management Policy Configuration
    MATRIXX Policy Application for Gx monitors normalized subscriber parameters and indicates which policies should be applied in one or more Policy and Charging Enforcement Functions (PCEFs).
  - Spending Limit Control Policy Configuration
    MATRIXX Policy Application monitors balance ranges from balance normalizers. A policy is rechecked when balances are updated or when any attribute of a subscriber or device is updated. MATRIXX Policy Application is optimized to detect if a balance update affects a policy.
    - Look Ahead Window for Spending Limit Control Policies
      As with session management policy control policies, you can configure a look ahead window for spending limit control policies. The look ahead window allows the Policy and Charging Rules Function (PCRF) or Policy Charging Function (PCF) to determine whether any policy changes are to occur within a configurable time period. With the look ahead window, the Charging Server evaluates the current policies and the next policy change to occur within the look ahead window, which it returns in its reply to the PCRF/PCF.
  - Session Management RAR and Spending Limit SNR Messages
    Gx RARs are sent to the Policy and Charging Enforcement Function (PCEF) or Sy SNRs are sent to the Policy and Charging Rules Function (PCRF) when MATRIXX Policy Application determines that there has been a policy change.
  - Gy Re-Auth-Request (RAR) Message
    MATRIXX Engine sends a Re-Auth Request (RAR) to the network for a subscriber-management (SubMan) request, when an open session is perceived as inactive, or on content quota expiration.
  - Sh Repository Configuration
    When using the Sh protocol, the PCRF sends an Sh SNR. MATRIXX Engine assumes one active Sh subscription per device, consisting of one Sh SNR per subscription (with the same Session-Id). If a subscription is already active, a second Sh SNR for that same subscription is handled as a duplicate of the original, while an SNR for a different subscription logs a warning and replaces the current one. Re-using the Session-Id of a currently-inactive subscription activates a new subscription with that same ID.
- 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

Look Ahead Window for Spending Limit Control Policies

As with session management policy control policies, you can configure a look ahead window for spending limit control policies. The look ahead window allows the Policy and Charging Rules Function (PCRF) or Policy Charging Function (PCF) to determine whether any policy changes are to occur within a configurable time period. With the look ahead window, the Charging Server evaluates the current policies and the next policy change to occur within the look ahead window, which it returns in its reply to the PCRF/PCF.

The Charging Server reports spending limit control policy changes within the look ahead time using the following MATRIXX Data Container (MDC) fields:

PendingPolicyCounterList — Has the pending policy counter status and the active time. Analogous to the Diameter Pending-Policy-Counter-Information AVP.
PendingPolicyChangeTime — The time at which the policy counter is expected to change within the look ahead window. Analogous to the Diameter Pending-Policy-Counter-Change-Time AVP.

MtxPendingPolicyCounterData has the pending policy counter status and the time at which the policy counter changes. PolicyCounterStatus is used by the OCS (Online Charging System) to report the status of a specific policy counter. PendingPolicyCounterChangeTime indicates the NTP (Network Time Protocol) time at which the pending policy counter status becomes the current status of a policy counter.

MtxPolicyCounterStatusData is used by the OCS or CHF to report the status of a policy counter. It includes PendingPolicyCounterList, a list of type MtxPendingPolicyCounterData, which contains the pending policy counter status and the active time. Only the next policy change in the future within the look ahead window is included in the return message, not all changes within the configurable period of time.

For details about these fields, see the discussions about MtxPolicyCounterStatusData and MtxPendingPolicyCounterData in the discussion about the Spending-Status-Notification Command Request in MATRIXX Diameter Integration.