Dynamic ARP Functionality for PL

Feature Summary and Revision History

Summary Data

Table 1. Summary Data
Applicable Product(s) or Functional Area PCF
Applicable Platform(s) SMI
Feature Default Setting Enabled – Always-on
Related Documentation Not Applicable

Revision History

Table 2. Revision History
Revision Details Release
First introduced. 2022.02.0

Feature Description

PCF supports Dynamic QoS ARP feature to calculate ARP (Priority Level) based on dynamic expression.

How it Works

This section describes how this feature works.

When PCF evaluates Rx_QoS_Table or N5_QoS_Table to derive QoS for dedicated bearer PCC rules, if a dynamic value expression is configured for ARP Priority-Level, then PCF evaluates the expression and set the result as Priority-Level.

Feature Configuration

To configure this feature, use N5STGConfiguration for Dynamic QoS ARP

Configuring N5STGConfiguration for Dynamic QoS ARP

This section describes the parameters that can be configured for N5STGConfiguration.

The N5STGConfiguration service configuration supports the following output AVPs that allow the dynamic value expression and their ranges to be defined.

Before setting the service parameters, ensure that you create a use case template and add a service for this configuration. For details, see Configuring the Use Case Template and Adding a Service.

The following table describes the N5STGConfiguration service parameters.

Table 3. N5STGConfiguration Parameters

Parameters

Description

Dynamic-QoS-ARP-Priority-Level
Note 

This is a mandatory parameter if the Dynamic QoS ARP feature is enabled.

This AVP is bound to the dynamic expression Priority-Level column. If the value is null/not configured, then Dynamic QoS ARP feature is disabled. If the value is configured, it overrides the integer PL value (if configured). The dynamic PL expression is either expected to match the java regex: ^[dD](\\s*([+-/*])\\s*([0-9]+))?$ or must be an offset value (of syntax: [+-][0-9]+). In case the value is provided in offset form, the “D” is implicit. Thus “+8” corresponds to “D+8” in expression form, “-5” corresponds to “D-5” and similarly, “0” corresponds to “D”.

Dynamic-QoS-ARP-Priority-Level-Default

If the default bearer doesn’t have a Priority-Level, this value is used as dedicated bearer PL. If the value is null/not configured, the default value (15) is used.

Dynamic-QoS-ARP-Priority-Level-Min

This output AVP provides upper/lower bound for the calculated PL value using the Dynamic expression provided under Dynamic-QoS-ARP-Priority-Level. If the value is null/not configured, the default value (1) is used.

Dynamic-QoS-ARP-Priority-Level-Max

The upper end of the valid PL range. If the value is null/not configured, the default value (15) is used.

Dynamic-QoS-Update-On-Change

This AVP controls whether the PCC rules must be updated on change in the dynamic PL value (for example, due to change in default bearer PL value). If value is null/not configured, the PCC rules are not updated with new dynamic PL value once installed.


Note

  • Using the offset form may have minor performance gains as compared to a full expression.

  • Range limits are not applied for the default dynamic values.

  • Dynamic expression has an implicit “Enforce” QoS action. The Action column value is ignored.

  • If dynamic expression configured for Priority-Level is invalid, PCF ignores the expression and does not include the ARP parameters (since PL is set as null) in the rule install. This is true even if absolute PL value is configured (absolute value is ignored).