Configuring the N15 Policy Service

This section describes the parameters for the N15 policy configuration.

The N15 policy service configuration object is used to configure the Service Area Restriction capability. The configuration involves mapping the N15 policy attributes and the Service Area Restriction CRD table that derives data from the bilateral exchange of requests between AMF and PCF. A one-to-many relation is supported between this service configuration object and the associated CRD table.

Before configuring the N15 policy service, ensure that you have created the use case template and added the required service.

For information on how to create a use case template and add a service for this configuration, see Configuring the Use Case Template and Adding a Service.

N15 Policy Parameters

Parameters

Description

Priority

Indicates the priority of the message for processing. The higher the number, the higher the priority. Default for most settings: 0

RAT Frequency Selection Priority

Indicates the "rfsp" attributes that PCF receives in the request.

The Radio Access Network (RAN) uses this parameter to derive the UE-specific cell reselection priorities to control the idle mode camping, and to decide on redirecting the active mode UEs to different frequency layers or RATs.

UE Policy

The UE policy consists of the UE Access Network discovery and selection policies.

Area Code

The area code is required only when the TAC information is unavailable. This code is operator-specific.

Tac Value

TACs are required only when the area code is unavailable.

Indicates a tracking area code that has a hexadecimal representation. Each character in the string shall take a value of "0" to "9" or "A" to "F" and represents 4 bits. The most significant character representing the 4 most significant bits of the TAC shall appear first in the string, and the character representing the 4 least significant bit of the TAC appears last in the string.

Examples:

A legacy TAC 0x4305 is encoded as "4305".

An extended TAC 0x63F84B is encoded as "63F84B"

Restriction Type

Provides the options to configure the type of restriction attribute that you want to configure:

  • ALLOWED_AREAS: Indicates the area where the restriction can be applied.

  • NOT_ALLOWED_AREAS: Indicates the area where the restriction cannot be applied.

  • NO_RESTRICTION: Indicates the areas that do not have any restriction applied.

Max Num Of T As

Denotes the maximum number of allowed tracking areas for use when the restriction is set to "ALLOWED_AREAS".

This attribute is unavailable when the Restriction Type takes the value as "NOT_ALLOWED_AREAS".

Note
The Max Num Of T As value cannot be lower than the number of TAIs included in the "tacs" attribute.

Max Num Of T As For Not Allowed Areas

Denotes the maximum number of allowed tracking areas for use when Restriction Type is set to "NOT_ALLOWED_AREAS".

This attribute is unavailable when the Restriction Type takes the value as "ALLOWED_AREAS".