Multicast Session Signaling via Group Paging in 5G NR
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Solution Overview
Problem
Current 5G New Radio (NR) multicast broadcast services face challenges in efficiently notifying User Equipment (UE) about multicast session state changes across different Radio Resource Control (RRC) states, requiring flexible and efficient signaling approaches to handle various RRC states and congestion scenarios.
Innovation Solution
The proposed method involves a multicast session notification signaling procedure using unicast paging, group paging with common Paging Occasions (POs), MCCH-based notification, and Paging Early Indication (PEI) handling, specifically tailored for UEs in RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states to manage congestion and optimize signaling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast session notification is sent to UEs in RRC_IDLE and RRC_INACTIVE states, then all UEs can be notified of session state changes, but signaling congestion and network overhead increase
Solution Approach 1:
The patent segments UE notification into different categories based on RRC state: UEs in RRC_CONNECTED state receive notifications through dedicated signaling, while UEs in RRC_IDLE and RRC_INACTIVE states are notified through group paging. This segmentation allows the system to use appropriate notification mechanisms for different UE states, avoiding unnecessary signaling for UEs that can receive notifications more efficiently through group-based approaches.
Solution Approach 2:
The patent introduces a group paging mechanism as an intermediary between the network and UEs in idle/inactive states. Instead of direct unicast signaling to all UEs, the network uses group paging to broadcast session state changes to multiple UEs simultaneously, reducing signaling congestion while maintaining reliable notification delivery.
2Productivity
If group paging with common Paging Occasions is used for multicast notification, then multiple UEs can be notified simultaneously, but UE power consumption increases due to extended wake-up periods
Solution Approach 1:
The patent implements periodic monitoring of paging occasions for multicast session notifications. UEs in idle and inactive states monitor for group paging at specific periodic intervals rather than continuously, allowing the network to balance notification throughput with UE power consumption by controlling when wake-ups occur.
Solution Approach 2:
The patent uses Paging Early Indication (PEI) as a preliminary action before actual paging. The network can indicate in advance whether paging messages are present, allowing UEs to make informed decisions about whether to wake up fully, thereby reducing unnecessary wake-ups and associated power consumption while maintaining the ability to deliver notifications efficiently.
3Productivity
If Paging Early Indication (PEI) is used to indicate presence of paging, then UE wake-up efficiency improves, but PEI false indications cause unnecessary RRC resume procedures
Solution Approach 1:
The patent implements a feedback mechanism where the network carefully manages PEI indications based on actual paging content and UE state. The system provides feedback about whether real paging messages are present, allowing UEs to make accurate decisions about resuming connections, thereby improving wake-up efficiency while minimizing false indications that would cause unnecessary RRC resume procedures.
Data Source
AI summary
Embodiments herein provide method for multicast session notification signalling and procedure in wireless network (1000) by UE (100). In an embodiment, the method includes receiving a signal related with a multicast and broadcast service (MBS) session in a radio resource control (RRC) connected state; in case that the UE (100) transits from the RRC connected state to one of a RRC idle state or a RRC inactive state and determines to join in at least one MBS session, monitoring a message for a group notification related with the at least one MBS session on a physical downlink control channel (PDCCH); based on a detection of the paging message, identifying a temporary mobile group identity (TMGI) indicating one of the at least one MBS session included in the paging message; and forwarding the identified TMGI to an upper layer.