Multicast Broadcast Services Paging for RRC-Inactive Reception

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Solution Overview

Problem

Existing 5G networks face challenges in efficiently managing multicast broadcast services (MBS) notification signaling in a radio resource control (RRC) inactive state, leading to inefficiencies in data reception and state transitions.

Innovation Solution

A method for determining paging occasions to monitor downlink control channels for MBS-related notifications, receiving these notifications, and transitioning to appropriate RRC states based on configuration parameters and channel robustness conditions, enabling efficient MBS data reception even in inactive states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE monitors downlink control channels for MBS notifications while in RRC inactive state, then MBS data reception capability is improved, but power consumption and processing overhead increase

Engineering Contradiction:

ImproveMBS data reception capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The UE monitors downlink control channels at specific periodic intervals (paging occasions) rather than continuously, enabling MBS notification reception while conserving battery power during inactive state

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The network autonomously notifies UEs about MBS session changes through paging messages without requiring UE to actively request or maintain continuous connection, reducing UE processing overhead

Inventive Principle:

Principle #25Self-service

2Reliability

If the UE transitions to RRC connected state upon receiving MBS notifications, then MBS data reception reliability is improved, but state transition overhead and latency increase

Engineering Contradiction:

ImproveMBS data reception reliabilityVSAvoidstate transition overhead

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network pre-configures UEs with MBS reception parameters and paging occasion information while in inactive state, so that UEs can directly receive MBS data without full state transition when notifications are received

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts UE state based on MBS notification content - UEs transition to connected state only when necessary for specific MBS sessions, rather than maintaining static connection states

Inventive Principle:

Principle #15Dynamics

3Productivity

If paging occasions are determined based on UE identifier and DRX procedure, then paging efficiency is improved, but complexity of paging mechanism increases

Engineering Contradiction:

Improvepaging efficiencyVSAvoidpaging mechanism complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The paging mechanism divides UEs into different groups based on their identifiers and assigns specific paging occasions to each group, enabling efficient targeted notification while maintaining manageable complexity through structured organization

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250267764A1Multicast broadcast services notification and operation in inactive state

Publication Date: 2025.08.21 TOYOTA JIDOSHA KK

AI summary

A method of multicast broadcast services (MBS) notification signaling includes determining, by a user equipment (UE), paging occasions for monitoring a downlink control channel associated with one or more paging messages comprising one or more MBS-related notifications that are associated with scheduling information for reception of MBS data; receiving the one or more MBS-related notifications based on monitoring the downlink control channel in one or more first paging occasions of the paging occasions; and receiving the MBS data based on the one or more MBS-related notifications.