What's New in This Guide

This section introduces the documentation updates for release 25.2.2xx.

Release 25.2.201 - G45820-01, April 2026

  • Feature Updates:
    • New Features:
      • PCF timer-expiry support when Subscribing to Notifications from UDR as per 29.519
        • Added Expiry Handling for Policy Data Subscriptions to describe how Policy handles timer expiry for subscription notifications from UDR.
        • Added the following fields to PDS Settings:
          • Policy Data Subscription Enabled
          • Pre-Expiry Period (in minutes)
          • Policy Data Subscription Expiry Audit Notification Rate (per second)
          • Policy Data Subscription Expiry Max Age (% of Pre-expiry period)
          • Policy Data Subscription Expiry Min Audit Pass Interval (in minutes)
        • Added the following advanced settings keys to PDS Settings:
          • POLICY_DATA_SUBSCRIPTION_EXPIRY_ENABLED
        • Added the following metrics to Policy DS Metrics:
          • occnp_policy_data_subscription_expiry_status_total
          • occnp_policy_data_resubscription_request_total
          • occnp_policy_data_resubscription_response_total
        • Added the following alerts to Common Alerts:
          • POLICYDS_PREEXPIRY_RESUBSCRIBE_FAILURE_MINOR
          • POLICYDS_PREEXPIRY_RESUBSCRIBE_FAILURE_MAJOR
          • POLICYDS_PREEXPIRY_RESUBSCRIBE_FAILURE_CRITICAL
          • POLICYDS_EXPIRED_SUBSCRIPTION
      • Policy Support for Dynamic AMF Subscription and N1N2 Message Routing on GUAMI Update
      • Support for DNN Replacement and Slice Support in AM Policy
        • Added Support for DNN Replacement and Slice Support in AM Policy to describe how PCF supports DNN replacement when UE operates using local configuration or when the operator policies are used to replace a UE requested DNN with another DNN used only internally in the network.
        • Edited description of Default Triggers field under Rules section in PCF Access and Mobility to include support for ALLOWED_NSSAI_CH and SMF_SELECT_CH.
        • Edited description of Override Supported Features field under System section in PCF Access and Mobility to include support for DNNReplacementControl and SliceSupport.
        • Added SYSTEM.SEND_UNSUPPDNN_ON_AM_RESPONSE advanced settings key to PCF Access and Mobility, which is used to indicate DNN replacement request by AMF when the UE requests an unsupported DNN during a PDU session establishment request.
        • Added dnn_replacement_total metric to AM Service Metrics.
      • Application Framework Change:
        • Added Application Framework Change to describe the impacts after replacing Spring Boot with Micronaut.
        • Removed the Support for Prevention of Requests Accumulation at Undertow Worker Queue feature.
      • Support to Display the Text Names of URSP and UPSI Rules in Logs
        • Added Support to Display the Text Names of URSP and UPSI Rules in Logs to describe how monitoring capability can be enhanced by ensuring that application logs for the UE and PRE services display both the name and the corresponding identifiable hexadecimal ID (UUID) for each User Plane Subscription Information (UPSI) and User Routing Selection Policy (URSP).
        • Added the advance setting, UE.POLICY.ACTION.NAME.AND.ID, in UE service.
    • Enhancements:
      • Support for cnDBTier APIs in CNC Console
      • Immediate Report Handling support for SM-Data on N36
      • Enhanced logging (at WARN level) for microservices involved in PCRF & Diameter
      • Support for USER_LOCATION_CH Event Trigger
        • Added Support for USER_LOCATION_CH Event Trigger to describe how Policy supports User Location Change (USER_LOCATION_CH) network event as defined in 3GPP TS 29.512.
        • Added the following metrics to SM Service Metrics, which are used to support count of requests received and processed with aggregated UE location changes:
          • usr_loc_ch_supp_feat_in_sm_create_req
          • usr_loc_ch_sent_in_response
          • usr_loc_ch_in_update_notify
          • usr_loc_ch_in_sm_update
        • Added USER_LOCATION_CH as one of the values of Default Policy Control Request Triggers drop-down list under Policy Control Request Trigger group in PCF Session Management.
    • Support for Sponsored Data Connectivity When AF/NEF Provides the Support Over Policy Authorization Service
      • Updated Support for Sponsored Data Connectivity When AF/NEF Provides the Support Over Policy Authorization Service to describe the support for Patch Correction and sponStatus functionalities.
      • Added the following Advanced Settings keys to PCF Policy Authorization:
        • SYSTEM.ACCEPT_REQUEST_WHEN_MISSING_SPONSORED_CONNECTIVITY_DATA
        • SYSTEM.INCLUDE_SPONID_ASPID_DIMENSIONS
        • SYSTEM.RETAIN_USAGE_REPORT_WHEN_USG_THRES_NULL
      • Added the following metrics to PA Service Metrics to support the Sponsored Data Connectivity feature:
        • pa_sponsored_sessions_total
        • pa_sponsored_session_update_notify_total
      • Added the following alerts to PCF Alerts to support the Sponsored Data Connectivity feature:
        • SMF_REQUESTED_SERVICE_NOT_AUTHORIZED_ABOVE_CRITICAL_THRESHOLD_PERCENT
        • SMF_REQUESTED_SERVICE_NOT_AUTHORIZED_ABOVE_MAJOR_THRESHOLD_PERCENT
        • SMF_REQUESTED_SERVICE_NOT_AUTHORIZED_ABOVE_MINOR_THRESHOLD_PERCENT
        • AF_MANDATORY_IE_MISSING_SC_ABOVE_CRITICAL_THRESHOLD_PERCENT
        • AF_MANDATORY_IE_MISSING_SC_ABOVE_MAJOR_THRESHOLD_PERCENT
        • AF_MANDATORY_IE_MISSING_SC_ABOVE_MINOR_THRESHOLD_PERCENT
    • Enhancement to Overload control Handling in SM Service
      • Added Overload Control at Policy Microservices to describe overload control at Policy microservices level.
      • Updated PCF Session Management with details on configuring Overload control at SM service.
      • Added the following sections:
      • Added the following metrics to SM Service Metrics to support the overload control mechanism at Policy microservices level:
        • occnp_enhanced_overload_reject_total
        • occnp_service_load_level
        • occnp_load_level_polling_request_total
        • occnp_load_level_polling_response_total
        • occnp_load_level_polling_exception_total
        • occnp_polled_load_level_total
      • Added the following alerts to Common Alerts to support the overload control mechanism at Policy microservices level:
        • SM_SVC_REQ_ENHANCED_OVERLOAD_REJECTION_CRITICAL
        • SM_SVC_REQ_ENHANCED_OVERLOAD_REJECTION_MAJOR
        • SM_SVC_REQ_ENHANCED_OVERLOAD_REJECTION_MINOR
    • Optimizing N7 session lookup for Rx-AAR-I when BSF is disabled at Binding service
      • Updated Optimizing N7 Session Lookup for AAR messages in Rx Call flows with details on how N7 session lookup is processed when BSF is disabled or when CustomAVP is not sent by BSF.
      • Updated description of ENABLE_N7_SESSION_LOOKUP_COOKIE Advanced Settings key in PCF Session Management to explain the case when BSF is disabled or when CustomAVP is not received from BSF.
      • Updated description of ENABLE_N7_SESSION_LOOKUP_COOKIE Advanced Settings key in Settings to explain the case when BSF is disabled or when CustomAVP is not received from BSF.
      • Added the following metrics to Diameter Gateway Metrics:
        • occnp_ocnf_service_cookie_total
        • occnp_context_owner_source_total
      • Added the following alerts to List of Alerts:
        • N7_OPTIMIZED_LOOKUP_ERROR_RATE_ABOVE_MINOR_THRESHOLD_PERCENT
        • N7_OPTIMIZED_LOOKUP_ERROR_RATE_ABOVE_MAJOR_THRESHOLD_PERCENT
        • N7_OPTIMIZED_LOOKUP_ERROR_RATE_ABOVE_CRITICAL_THRESHOLD_PERCENT
    • Pod Protection at Ingress Gateway Using Rate Limiting
      • Updated Pod Protection at Ingress Gateway Using Rate Limiting section with the details of feature implementation to support congestion control and message priority capabilities also for Ingress Gateway in order to provide pod protection.
      • Added the following alerts to Common Alerts:
        • IGW_POD_PROTECTION_DOC_STATE
        • IGW_POD_PROTECTION_CONGESTED_STATE
  • General Updates: