Aggregator NWDAF Dynamic Subscription Management for 5G Analytics

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Solution Overview

Problem

In 5G networks, the aggregator NWDAF experiences unnecessary system overhead when cooperating with multiple NWDAFs, as it maintains subscriptions with NWDAFs that do not serve the UE, leading to inefficient data analytics and delayed switching to new NWDAFs when the UE moves.

Innovation Solution

The aggregator NWDAF sends subscription requests to the NWDAF whose serving area covers the current UE location and, upon notification of the UE's movement, determines and switches to a new NWDAF capable of serving the UE, while suspending or deregistering from the previous NWDAF, thereby optimizing data analytics and reducing unnecessary processing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the aggregator NWDAF maintains subscriptions with multiple NWDAFs to ensure coverage, then the system can provide comprehensive data analytics coverage, but it generates unnecessary system overhead and redundant data processing when the UE is not in the serving area of certain NWDAFs

Engineering Contradiction:

Improvedata analytics coverageVSAvoidsystem overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic subscription management where the aggregator NWDAF actively monitors UE location and dynamically adjusts its subscriptions with distributed NWDAFs. When UE location changes, the system dynamically establishes or terminates subscriptions based on current serving areas, transforming a static subscription model into a dynamic one that adapts to real-time network conditions.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces a feedback mechanism where the aggregator NWDAF receives location information from the network and uses this feedback to determine which distributed NWDAFs should be subscribed to. The system continuously monitors UE location and adjusts subscriptions accordingly, creating a closed-loop control system that optimizes resource allocation based on real-time conditions.

Inventive Principle:

Principle #23Feedback

2Speed

If the aggregator NWDAF subscribes to all NWDAFs to ensure rapid response to UE movement, then the system can quickly switch to new NWDAFs, but it causes delayed switching because the system must process and evaluate multiple subscriptions

Engineering Contradiction:

Improveswitching speedVSAvoidswitching delay

Core Design Contradiction:

SpeedVSLoss of time

Solution Approach 1:

The patent segments the subscription management process into distinct phases: pre-establishing subscriptions with multiple NWDAFs, monitoring UE location, and selectively activating subscriptions based on location. This segmentation allows the system to maintain readiness (pre-subscriptions) while avoiding the overhead of processing all subscriptions simultaneously during switching events.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements preliminary action by pre-establishing subscriptions with multiple distributed NWDAFs before the UE actually moves. This way, when location changes occur, the system can immediately activate the appropriate pre-subscribed NWDAF without needing to evaluate or establish new subscriptions at the moment of movement, significantly reducing switching delay.

Inventive Principle:

Principle #10Preliminary action

3Quantity of substance

If the aggregator NWDAF processes data analytics from all subscribed NWDAFs, then it can provide comprehensive analytics results, but it increases processing time and reduces analytic capacity due to redundant data collection

Engineering Contradiction:

Improveanalytics data volumeVSAvoidanalytic capacity

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent applies local quality by tailoring the data analytics subscription to match the UE's current location and serving area. Instead of uniformly processing data from all subscribed NWDAFs, the system selectively processes data only from NWDAFs that are currently serving the UE, optimizing the quality and relevance of analytics data while reducing unnecessary processing.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent extracts and removes redundant data processing operations by identifying and eliminating subscriptions with NWDAFs that do not currently serve the UE. This extraction process separates useful data collection operations from unnecessary ones, allowing the system to maintain comprehensive analytics capability while removing redundant processing overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20240276198A1Subscription and processing method, network data analytic function, storage medium

Publication Date: 2024.08.15 DATANG MOBILE COMM EQUIP CO LTD

AI summary

The present disclosure provides a subscription and processing method, an NWDAF, and a storage medium. The method includes: sending, by a aggregator NWDAF, a subscription request to an NWDAF1, the NWDAF1 being an NWDAF whose serving area covers a current location of a UE; upon the receipt of a notification that the UE has moved out of the serving area of the NWDAF1, determining, by the aggregator NWDAF, a 5GC network function currently serving the UE and determining an NWDAF2 which is capable of serving the 5GC network function, or determining a location of the UE and querying the NWDAF2 which is capable of serving the UE in accordance with the location of the UE; and sending, by the aggregator NWDAF, a subscription request to the NWDAF2.