Multicast Broadcast Services Interest Indication Signaling

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Solution Overview

Problem

In 5G mobile communication systems, user equipment (UE) may receive both unicast and multicast broadcast services from different networks, leading to unawareness of broadcast service reception by the serving network, resulting in inappropriate configuration and suboptimal performance.

Innovation Solution

A method for signaling multicast broadcast services (MBS) interest indication (MII) involves sending an MII message to a source cell, receiving RRC_Reconfiguration or RRC_Reconfiguration with reconfigurationWithSync, connecting with a target cell, and sending the MII message when receiving SIB1 with nonServingCellMII from the target cell.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UE receives both unicast and multicast broadcast services from different networks, then service diversity and connectivity are improved, but the serving network becomes unaware of broadcast service reception leading to inappropriate configuration

Engineering Contradiction:

Improveservice diversityVSAvoidbroadcast service reception awareness

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent implements feedback mechanisms where the UE reports its multicast broadcast service interest indication to the serving cell through MII messages. This feedback loop ensures the serving network becomes aware of the UE's broadcast service reception status, enabling appropriate configuration and resource management while maintaining service diversity.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If UE signals MBS interest indication to serving cell, then configuration accuracy is improved, but transmission reliability may be compromised during UE mobility

Engineering Contradiction:

Improveconfiguration accuracyVSAvoidMII transmission reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies preliminary action by having the UE send MII messages before and during handover procedures. The UE proactively signals its MBS interest indication to the source cell, and the source cell forwards this information to the target cell before the actual handover occurs. This ensures configuration accuracy is maintained while the transmission reliability is preserved through advance preparation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The source cell acts as an intermediary during UE mobility. It receives the MII message from the UE, processes the information, and forwards it to the target cell. This intermediary role ensures reliable transmission of configuration information during handover, maintaining both accuracy and reliability of the MII signaling process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If UE sends MII message during handover, then configuration accuracy is maintained, but transmission robustness may be compromised due to mobility dynamics

Engineering Contradiction:

Improveconfiguration accuracyVSAvoidtransmission robustness

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent ensures continuity of useful action by maintaining the MII signaling process throughout the handover procedure. The UE continues to send MII messages during the handover transition, and the network continuously processes and forwards these messages. This continuous action maintains configuration accuracy while the robustness is preserved through uninterrupted signaling during mobility dynamics.

Inventive Principle:

Principle #20Continuity of useful action

4Stability of the object's composition

If UE receives RRC reconfiguration during mobility, then connection continuity is improved, but MII transmission may be affected by reconfiguration timing

Engineering Contradiction:

Improveconnection continuityVSAvoidMII transmission reliability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent applies preliminary action by having the UE send MII messages before receiving the RRC reconfiguration message during handover. The UE proactively signals its MBS interest indication to the source cell, which then forwards this information to the target cell before the RRC reconfiguration is applied. This timing sequence ensures both connection continuity and MII transmission reliability are maintained.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250151165A1Method and UE for signalling multicast broadcast services interest indication

Publication Date: 2025.05.08 SAMSUNG ELECTRONICS CO LTD

AI summary

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure relates to method 300a and UE 101 for signalling multicast broadcast services (MBS) interest indication (MII). The method comprises of sending, to a source cell an MII message. The method further comprises of receiving from the source cell, one of: RRC_Reconfiguration or RRC_Reconfiguration with reconfigurationWithSync. The RRC_Reconfiguration or RRC_Reconfiguration with reconfigurationWithSync is received during UE mobility. The method further comprises of connecting with a target cell upon receiving one of: RRC_Reconfiguration or RRC_Reconfiguration with reconfigurationWithSync. The method finally comprises of sending the MII message to the target cell.