Coordinating Node Context Management for Multi-RAT UE Handovers

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Solution Overview

Problem

In wireless networks, User Equipment (UE) maintaining multiple contexts across different Radio Access Technologies (RATs) leads to inefficient resource usage and potential call disconnections due to lack of synchronization between RNC and BSC nodes.

Innovation Solution

A coordinating node hosts both 2G and 3G RAT controllers, maintaining a central database to track UE contexts and send deregistration commands when UE switches RATs, freeing resources at both the coordinating node and base stations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UE maintains context in multiple RATs simultaneously, then UE can access both 2G and 3G networks, but network resources are wasted and call disconnections occur due to lack of synchronization

Engineering Contradiction:

ImproveUE access capability across multiple RATsVSAvoidnetwork resource waste

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent extracts the context management function from distributed RAT controllers and centralizes it in a single coordinating node. When UE switches between RATs, only the new RAT controller maintains active context while the old one releases it, preventing resource waste while preserving multi-RAT access capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The coordinating node acts as an intermediary between multiple RAT controllers, receiving context information and managing deregistration commands. This mediator ensures synchronization across RATs without requiring each controller to independently track UE state

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If independent RAT controllers handle respective RATs, then each controller operates autonomously, but multiple UE contexts are maintained leading to resource inefficiency

Engineering Contradiction:

Improveindependent controller operationVSAvoidnetwork resource efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent merges the context management functions of multiple independent RAT controllers into a single coordinating node. This consolidation maintains operational simplicity while eliminating redundant context maintenance, thereby improving resource efficiency without sacrificing controller autonomy

Inventive Principle:

Principle #5Merging (Combining)

3Loss of time

If Idle timer is set high for optimization, then UE can stay registered longer, but multiple contexts accumulate for single UE across smaller cells

Engineering Contradiction:

Improveregistration maintenance timeVSAvoidnumber of UE contexts

Core Design Contradiction:

Loss of timeVSQuantity of substance

Solution Approach 1:

The patent extracts the context from old RAT controllers when UE moves to new RATs, regardless of Idle timer status. This allows extended registration periods without accumulating multiple contexts, as each coordinating node releases contexts for UEs that have switched RATs

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20250024402A1Multiple Context Issue for Single UE in the Network

Publication Date: 2025.01.16 PARALLEL WIRELESS INC

AI summary

Systems, methods and computer software are disclosed for resolving multiple contexts for a User Equipment (UE) in a wireless network. In one embodiment a method includes maintaining, for a coordinating node hosting a first Radio Access Technology (RAT) controller and a second RAT controller simultaneously, a centrally maintained database; determining, based on the contents of the centrally maintained database, when the UE is registering with the second RAT controller while currently registered with the first RAT controller; and sending, by the second RAT controller, a deregistration command to the first RAT controller the UE was registered with, wherein context is freed and wherein resources held at both the coordinating node and at a base station are freed.