MBS Session Paging via Core-Network Timing in 5G RAN
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Solution Overview
Problem
The determination of paging occasions and frames for multicast and broadcast services (MBS) in 5G networks is unclear, leading to UEs in 5GMM-CONNECTED mode failing to receive MBS data, and DUs in distributed base stations lacking clarity on paging determinations.
Innovation Solution
A method and system for managing paging in RAN nodes, including receiving a message for MBS sessions and using information to page UEs, with base stations configuring radio resources for MBS data transmission and UEs applying security keys to receive MBS data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the RAN transitions UEs to RRC_IDLE or RRC_INACTIVE state when there is no data to send, then energy saving is improved, but the complexity of determining paging occasions and frames increases
Solution Approach 1:
The patent introduces a core network entity (AMF/SMF) as an intermediary that assumes the responsibility of determining paging occasions and frames. This mediator receives UE identity information from the RAN, calculates the appropriate paging timing based on stored DRX parameters, and provides the paging decision to the RAN. This division of labor reduces the complexity at the RAN level while enabling energy-efficient idle/inactive state transitions.
Solution Approach 2:
The system implements a feedback mechanism where the core network provides paging occasion and frame information back to the RAN based on UE state and DRX configuration. The RAN uses this feedback to accurately schedule paging messages, ensuring that UEs in idle or inactive states can be reliably woken up for MBS data without requiring complex local determination logic.
2Adaptability or versatility
If the base station configures common frequency resources and group common PDCCH for MBS, then multicast service coverage is improved, but the difficulty of determining paging occasions for different 5GMM modes increases
Solution Approach 1:
The core network entity implements a universal paging determination mechanism that handles multiple 5GMM modes (IDLE, CONNECTED, INACTIVE) through a single unified approach. By storing DRX parameters and UE identity information centrally, the system can calculate appropriate paging occasions for any mode without requiring mode-specific complex logic at the RAN, thus simplifying the determination process while maintaining broad coverage.
Solution Approach 2:
The system performs preliminary action by pre-storing DRX parameters and UE identity information in the core network entity before paging is needed. When MBS data becomes available, the core network can immediately calculate the correct paging occasion and frame based on pre-configured parameters, eliminating the need for complex real-time determination and enabling reliable paging across different 5GMM modes.
3Stability of the object's composition
If UEs in 5GMM-CONNECTED mode with RRC inactive indication receive paging for MBS session, then service continuity is improved, but the UE inability to respond to paging increases
Solution Approach 1:
The core network entity acts as an intermediary that receives UE identity information from the RAN and determines the correct paging timing for UEs in CONNECTED mode with RRC inactive indication. By using stored DRX parameters and calculating paging occasions centrally, the system ensures that these UEs receive paging messages at the correct time, enabling them to respond and maintain service continuity without reliability issues.
Data Source
AI summary
A paging method is implemented in a node of a radio access network (RAN) and comprises receiving a message including an identifier of a multicast and/or broadcast services (MBS) session; and in response to determining that the message includes a paging list, paging a user equipment (UE) using information in the message.