WTRU Reliability Indication for Multicast Broadcast Services

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Solution Overview

Problem

Existing wireless communication systems face challenges in providing reliable multicast and broadcast services (MBS) during the INACTIVE state, where network monitoring and feedback loops are limited, affecting the reliability and efficiency of MBS transmission.

Innovation Solution

The system implements reliability monitoring and indication techniques within a wireless transmit/receive unit (WTRU) to assess and report the reliability of MBS transmissions during the INACTIVE state. This involves receiving MBS configuration information, determining reliability metrics, and selecting appropriate random access resources for reliability indications based on preconfigured mappings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the WTRU enters INACTIVE state to save energy and reduce network overhead, then energy consumption and network overhead are reduced, but reliability monitoring and feedback capability are lost

Engineering Contradiction:

Improveenergy consumptionVSAvoidreliability monitoring capability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The network pre-configures the WTRU with reliability monitoring parameters, metrics, and reporting configurations before the WTRU enters INACTIVE state. This preliminary configuration enables the WTRU to autonomously perform reliability monitoring and reporting without active network control, resolving the contradiction by maintaining reliability capability while in energy-saving state

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The WTRU autonomously monitors reliability metrics and generates reliability indications without network intervention during INACTIVE state. The device serves itself by independently evaluating transmission reliability and selecting appropriate reporting resources, eliminating the need for continuous network monitoring while preserving reliability feedback

Inventive Principle:

Principle #25Self-service

2Reliability

If the WTRU maintains full communication capability in INACTIVE state to ensure reliability, then reliability monitoring is maintained, but energy consumption increases

Engineering Contradiction:

Improvereliability monitoring capabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The WTRU performs only essential reliability monitoring functions during INACTIVE state rather than full communication operations. It monitors specific reliability metrics and reports only when necessary, achieving adequate reliability monitoring with minimal energy expenditure by doing just enough rather than everything

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The reliability monitoring and reporting are performed periodically or event-triggered rather than continuously. The WTRU evaluates reliability metrics at configured intervals or upon specific events, maintaining reliability oversight while consuming energy only when needed rather than continuously

Inventive Principle:

Principle #19Periodic action

3Reliability

If the system implements detailed reliability monitoring in INACTIVE state to improve reliability, then reliability indication accuracy is improved, but device complexity increases

Engineering Contradiction:

Improvereliability indication accuracyVSAvoidmonitoring mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and isolates only the essential reliability monitoring functions needed during INACTIVE state, separating them from full communication protocols. The WTRU implements a simplified reliability monitoring mechanism that focuses solely on evaluating transmission reliability and reporting, removing unnecessary complexity while maintaining accuracy

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system changes the operational parameters of reliability monitoring for INACTIVE state, using simplified metrics and reporting formats appropriate for the low-power state. Configuration parameters define which metrics to monitor and how to report, allowing accurate reliability indication with reduced processing complexity through parameter optimization

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12238746B2Multicast and broadcast services reliability indication

Publication Date: 2025.02.25 INTERDIGITAL PATENT HOLDINGS INC

AI summary

Reliability monitoring and indication may be provided for multicast and broadcast services (MBS). A WTRU may receive an MBS configuration for an INACTIVE state (e.g., suspend PTP and maintain PTM for split MRB). MBS configuration and suspend configuration may be associated with different areas (e.g. MBS area versus RAN area). Configurations may indicate reliability indication triggers (e.g., polling, event-based, periodic), a reliability metric configuration, and/or a reliability indication configuration. A WTRU (e.g., in INACTIVE) may receive an MBS transmission (e.g., on MRB(s)), receive an MCCH (e.g., with trigger(s) for reliability indication during MCCH modification period), determine reliability metric(s) associated with MBS TB reception, monitor reliability metric(s) during time interval(s) for MCCH modification period(s), select RA resources (e.g., per mapping between resources and reliability metric value/range), indicate a reliability metric (e.g., transmit reliability indication via selected preamble and RO), and/or monitor RAR format responsive to the reliability indication transmission.