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1. Energy Saving

1.1 Description

This section provides practical examples of how to leverage multiple E2 service models to optimize and manage Radio Access Network (RAN) resources for energy saving.

The examples below showcase how to combine different service models such as E2SM KPM for performance monitoring and E2SM CCC for cell control to enable service-driven decisions.

For instance, monitor the Physical Resource Blocks (PRBs) using E2SM KPM and based on the observed data, make a decision to turn off a cell using E2SM CCC.

1.2 Scenario Overview

In this scenario, we describe the process of utilizing E2AP and E2SM models to retrieve metrics from the RAN (Radio Access Network) and trigger cell control operations based on specific conditions.

This approach can be used to enable dynamic decision-making based on real-time metric analysis, enabling the RIC to optimize network energy efficiency.

  1. Process E2AP messages and retrieve key E2 Node information

    The initial step involves processing E2AP Forwarded Messages to retrieve critical information about each E2 node.

    This provides the xApp with essential data needed to configure further E2SM subscriptions.

    The E2AP data contains key fields essential for managing and optimizing E2 node operations, including:

    • GlobalE2node-ID: A unique identifier for each E2 node.
    • RANfunction-Item: Lists the service models (such as E2SM KPM and E2SM CCC) that the node can support, guiding relevant subscription choices.
    • measInfo-Action-List: Provides access to Key Performance Indicators (KPIs) like throughput and resource utilization, which are essential for evaluating network performance.
    • ranFunctionID: A unique identifier for each RAN function on the E2 node, enabling precise targeting and management of specific functions like E2SM KPM or E2SM CCC.

    This information enables the xApp to configure targeted subscriptions for both monitoring and control, setting the stage for dynamic and efficient RAN management.

  2. Subscribe to PRB Metrics

    Using the information from E2AP, send a subscription request to collect PRB metrics defined by the E2SM KPM (Key Performance Metrics) service model via an E2SM KPM Subscription message.

    This subscription allows the xApp to retrieve PRB (Physical Resource Block) metrics, enabling:

    • Continuous monitoring of resource usage.
    • Gathering critical performance data for analysis.

  3. Subscribe to Cell Control Events

    Simultaneously, use the E2SM CCC (Cell Control Configuration) E2SM CCC Subscription message to:

    • Receive cell control events that indicate changes in cell status.
    • Enable dynamic adjustments to cell operations based on real-time conditions.

  4. Analyze PRB Data

    After the PRB metrics have been collected, analyze the data to assess predefined conditions, such as network performance or traffic load.

    Based on this analysis:

    • Evaluate predefined conditions related to network performance (e.g., traffic load).
    • Determine whether to activate or deactivate cells based on the analysis.

  5. Send Control Messages

    If the analysis suggests that energy savings can be achieved, use the E2SM CCC Control message to send a control command that deactivates the cell.

    This approach helps reduce energy consumption and enhances network sustainability during low-demand periods.