UE MBS Reception Activation via Paging and Preliminary Configuration

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Solution Overview

Problem

The existing technologies do not clearly describe how a user equipment (UE) activates the reception of multicast and broadcast services (MBS) upon receiving an MBS activation notification message.

Innovation Solution

A method in a UE for managing the reception of MBS data, which involves receiving a paging message from a radio access network (RAN) containing an MBS session identifier, and initiating the reception of MBS in response to the paging message.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a base station configures UEs with common frequency resource and group common PDCCH for MBS, then MBS can be provided to multiple UEs, but it is not clear how the UE activates MBS reception upon receiving activation notification

Engineering Contradiction:

ImproveMBS reception activation capabilityVSAvoidUE activation procedure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The base station performs preliminary configuration of common frequency resources and group common PDCCH before MBS activation. The UE receives and stores this configuration in advance, so that when activation notification is received, the UE can immediately start reception without additional configuration steps, simplifying the activation procedure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

A group common RNTI is introduced as an intermediary identifier to scramble the CRC of DCI on the group common PDCCH. This allows the base station to address multiple UEs simultaneously with a single activation notification message, enabling efficient group-based MBS activation without requiring individual UE addressing.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the base station sends DCI with CRC scrambled by group common RNTI on group common PDCCH to schedule PDSCH transmission, then MBS data can be transmitted efficiently, but the UE lacks clear procedures to transition from idle to connected state for MBS reception

Engineering Contradiction:

ImproveMBS data transmission efficiencyVSAvoidUE state transition procedure

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The base station configures the UE with idle mode operation parameters and measurement configurations in advance. When the UE receives the paging message with MBS activation indication, it can immediately perform the necessary state transition to connected mode and start receiving MBS data without requiring additional configuration messages, thereby simplifying the overall procedure.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The MBS reception activation procedure is segmented into distinct phases: idle mode configuration, paging message reception with activation indication, state transition to connected mode, and MBS data reception. This segmentation allows each phase to be optimized independently and makes the overall procedure more manageable and implementable.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250132942A1Managing reception of multicast and broadcast services

Publication Date: 2025.04.24 GOOGLE LLC

AI summary

To manage reception of Multicast and Broadcast Services (MBS) data, a user equipment (UE) receives, from a radio access network (RAN), a paging message including an MBS session identifier (ID), the MBS session ID including a Temporary Mobile Group Identity (TMGI); and initiates reception of MBS in response to the paging message.