NG-RAN MBS Session Failure Reporting to AMF

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Solution Overview

Problem

Current 3GPP specifications do not provide a mechanism for the Radio Access Network (NG-RAN) to report Multicast and Broadcast Services (MBS) session failures to the core network, leading to potential missed important MBS information and public safety issues due to unawareness of session releases.

Innovation Solution

Introduce a method for the NG-RAN to report MBS session failures to the Access and Mobility Management Function (AMF), which then informs the Multicast/Broadcast Session Management Function (MB-SMF), allowing the Application Function/Application Server to adjust policies or notify affected User Equipments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If NG-RAN releases MBS session resources for higher priority services, then service quality and resource utilization are improved, but the AF/AS becomes unaware of the failure causing information loss

Engineering Contradiction:

Improveservice qualityVSAvoidMBS session failure information

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent implements a feedback mechanism where the NG-RAN node sends a notification message to the AMF when an MBS session is released, enabling the core network to be informed of the failure. This feedback loop ensures that the AF/AS receives information about session releases through the AMF and MB-SMF, resolving the information loss issue while maintaining the ability to prioritize services.

Inventive Principle:

Principle #23Feedback

2Productivity

If NG-RAN prioritizes higher GBR services, then resource allocation is optimized, but existing MBS sessions may be unintentionally released

Engineering Contradiction:

Improveresource utilizationVSAvoidMBS session continuity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The notification mechanism provides feedback to the AMF and subsequently to the MB-SMF about MBS session releases. This enables the system to monitor and track session continuity, allowing for better management of resource allocation while maintaining awareness of session status to prevent unintentional releases.

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If current 3GPP specifications are used, then standard compliance is maintained, but no mechanism exists for NG-RAN to report MBS session failures

Engineering Contradiction:

Improvespecification flexibilityVSAvoidsession failure notification capability

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent introduces the AMF as an intermediary component that receives notifications from the NG-RAN node and forwards them to the MB-SMF. This intermediary mechanism enables failure reporting capability while maintaining compliance with existing 3GPP architecture, allowing the system to adapt to new requirements without breaking standard compliance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250016016A1MBS session failure

Publication Date: 2025.01.09 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method performed by a Radio Access Network, RAN, node, the method comprising, after a Multicast and Broadcast Services, MBS, session failure, sending (510, 601), to a first core network node, a first message indicating that the MBS session has failed, wherein the first message comprises an MBS session identifier, ID, (i.e., Temporary Mobile Group Identity, TMGI) for the failed MBS session and/or a cause code for the MBS session failure.