Multicast Reception and Small Data Transmission in 5G Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 5G mobile communication systems face challenges in supporting higher data rates beyond 4G systems, particularly in managing multicast and broadcast services and small data transmission efficiently, especially when transitioning between RRC inactive and connected states.
Innovation Solution
A method and system that involves a terminal receiving an RRC release message for suspend configuration, identifying ongoing SDT procedures, and monitoring paging channels using a temporary mobile group identity associated with multicast sessions, allowing for efficient management of multicast reception and small data transmission without unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously monitors the paging channel for multicast reception in RRC inactive state, then the multicast service reception reliability is improved, but the power consumption increases
Solution Approach 1:
The terminal performs discontinuous reception (DRX) by monitoring the paging channel only at periodic intervals rather than continuously. The terminal wakes up at predetermined paging occasions to check for multicast paging messages and returns to sleep mode otherwise, achieving a balance between reliable multicast reception and power consumption reduction.
Solution Approach 2:
The terminal autonomously determines whether to monitor the paging channel based on its current RRC state and configured parameters. When in RRC inactive state with SDT capability, the terminal self-manages the monitoring decision without requiring continuous network control, optimizing power usage while maintaining service reception capability.
2Reliability
If the terminal transitions to RRC connected state for small data transmission, then the transmission reliability is improved, but the transmission latency increases
Solution Approach 1:
The terminal performs small data transmission while remaining in RRC inactive state using pre-configured resources and procedures. By preparing the transmission mechanism in advance during the inactive state, the terminal avoids the time-consuming state transition to connected mode, reducing latency while maintaining adequate transmission reliability through pre-established resource allocations.
3Measurement precision
If the terminal monitors paging channel using TMGI for multicast sessions, then the multicast reception accuracy is improved, but the processing complexity increases
Solution Approach 1:
The terminal segments the paging monitoring process by specifically filtering for multicast-related paging messages using TMGI identification. Instead of processing all paging messages, the terminal focuses only on those relevant to multicast sessions, improving reception accuracy while reducing overall processing complexity through selective filtering.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure provides an apparatus, a method and a system for MBS multicast reception and small data transmission. A method performed by a terminal includes receiving, from a BS, an RRC release message including information indicating a suspend configuration for an RRC inactive state; identifying whether an SDT procedure is ongoing in the RRC inactive state, in case that there is a configuration by an upper layer for MBS multicast reception; and monitoring a paging channel for paging using a TMGI associated with an MBS session, based on the SDT procedure being not ongoing. The MBS session is associated with a bearer for the MBS multicast reception.