RAN Notification Area Nesting for RRC-Inactive UE Mobility

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Solution Overview

Problem

Current 3GPP standards do not guarantee that the RAN-based notification area for user equipment in an inactive state is a subset of the core network registration area, leading to potential inefficiencies and resource wastage due to overlapping or non-subset configurations.

Innovation Solution

The method involves the base station and core network coordinating to define the RAN-based notification area as a subset of the core network registration area by exchanging information on tracking areas and cell identities, ensuring that the UE can move within this area without updating its location, thereby maintaining efficient resource utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the RAN-based notification area is configured independently without coordination with core network registration area, then the UE can move freely within the RAN-based notification area, but the area may not be a subset of the core network registration area leading to resource wastage and inefficiencies

Engineering Contradiction:

ImproveUE mobility freedomVSAvoidresource wastage

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The base station receives information about the core network registration area from the core network and uses this feedback to properly configure the RAN-based notification area as a subset, eliminating the mismatch and resource wastage while preserving UE mobility freedom

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The RAN-based notification area is configured as a nested subset within the core network registration area, ensuring hierarchical containment where the RAN-based notification area cells are selected from and contained within the tracking areas of the core network registration area

Inventive Principle:

Principle #7Nested doll (Nesting)

2Area of stationary object

If the RAN-based notification area includes cells outside the core network registration area, then the UE can access more cells, but this causes non-subset configurations leading to inefficiencies

Engineering Contradiction:

Improvenotification area coverageVSAvoidresource utilization efficiency

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The base station receives feedback information from the core network about the registration area and uses this to constrain the RAN-based notification area configuration to only include cells within the registration area, optimizing resource utilization while maintaining adequate coverage

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The configuration parameters of the RAN-based notification area (cell identities, tracking area codes) are changed to ensure they match and are contained within the core network registration area parameters, eliminating the non-subset configuration issue

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12418883B2Configuration of a RAN based notification area for a user equipment in RRC inactive state

Publication Date: 2025.09.16 NEC CORP

AI summary

A communication system is disclosed in which a base station receives, from at least one further base station, information identifying at least one respective tracking area associated with at least one cell of each further base station. The base station also receives, from a core network, information identifying a registration area for a user equipment (UE). The base station defines, based on the received information identifying at least one respective tracking area and the received information identifying a registration area, a radio access network (RAN) based notification area for the UE.