MBS Cell Transition Using SIB20/SIB21 Cell Prioritization

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Solution Overview

Problem

Existing 5G communication systems fail to prioritize multicast and broadcast service (MBS) support during cell transition activities, leading to MBS preferred UEs camping on non-supporting cells, resulting in poor user experience and inefficient resource utilization.

Innovation Solution

MBS preferred UEs identify and prioritize cells supporting MBS by checking for the presence of SIB20/SIB21 during cell selection, reselection, handover, and redirection, ensuring connectivity to MBS-capable cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UEs camp on cells based on signal strength criteria during cell selection and reselection, then connection reliability is improved, but MBS service availability deteriorates because UEs may connect to non-MBS supporting cells

Engineering Contradiction:

Improveconnection reliabilityVSAvoidMBS service availability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies preliminary action by checking for MBS support (SIB20/SIB21 presence) before finalizing cell selection or reselection. The UE identifies MBS-capable cells in advance and prioritizes them during the cell transition process, ensuring MBS service availability is maintained while still considering signal strength criteria.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If UEs prioritize MBS support during cell selection by checking SIB20/SIB21, then MBS service availability is improved, but device complexity increases due to additional information processing

Engineering Contradiction:

ImproveMBS service availabilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent leverages the existing SIB20 and SIB21 system information blocks that already contain MBS configuration information. By utilizing these existing universal information structures already present in the network for other purposes, the UE can identify MBS-capable cells without requiring dedicated new signaling or complex processing mechanisms.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If UEs perform additional checks for MBS support during cell transitions, then MBS service continuity is improved, but transition time increases due to extra processing steps

Engineering Contradiction:

ImproveMBS service continuityVSAvoidcell transition time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs MBS support checking as a preliminary step during cell selection and reselection procedures. By integrating the SIB20/SIB21 check into the existing cell evaluation process rather than as a separate post-selection step, the patent minimizes additional transition time while ensuring MBS service continuity.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12526697B2Method and system for initiating cell transition activities during multicast and broadcast services

Publication Date: 2026.01.13 SAMSUNG ELECTRONICS CO LTD

AI summary

A method and/or system for initiating one of a plurality of cell transition activities for a UE supporting multicast and broadcast services (MBS). The technique may include identifying, by the UE, one or more candidate cells available for one of the plurality of cell transition activities for the UE. The technique may include identifying, by the UE, at least one candidate cell among the one or more candidate cells that support MBS. The technique may include initiating, by the UE, one of the plurality of cell transition activities for the UE using the at least one candidate cell.