Multicast Small Data Reception in RRC Inactive State
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Solution Overview
Problem
Existing 5G networks face challenges in efficiently managing small data transmission during the radio resource control (RRC) inactive state, particularly in enhancing multicast data transmission processes.
Innovation Solution
A method for multicasting small data transmission (SDT) during the RRC inactive state by configuring user equipment (UE) with parameters for receiving multicast SDT data, including monitoring control channels for scheduling information and transmitting uplink feedback without transitioning to the RRC connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast SDT data transmission is enabled during RRC inactive state, then network resource utilization is optimized and signaling overhead is reduced, but device complexity increases due to additional configuration parameters and monitoring requirements
Solution Approach 1:
The configuration parameters for multicast SDT are segmented into different categories: some parameters are used only during RRC connected state, others only during RRC inactive state, and some are used in both states. This segmentation allows the device to activate only the necessary parameter sets based on current RRC state, reducing the effective complexity while maintaining network resource optimization benefits
Solution Approach 2:
Configuration parameters for multicast SDT are pre-configured during RRC connected state before transitioning to inactive state. This preliminary configuration includes setting up monitoring parameters for control channels, configuring uplink feedback parameters, and establishing multicast group identifiers. When transitioning to inactive state, the device already has these parameters ready, eliminating the need for complex real-time configuration decisions and reducing operational complexity
2Productivity
If configuration parameters are optimized for both RRC connected and inactive states, then multicast SDT reception efficiency is improved, but parameter management complexity increases
Solution Approach 1:
Different configuration parameters are optimized for specific RRC states rather than using a uniform configuration set. Parameters such as control channel monitoring configurations, uplink feedback parameters, and scheduling parameters are tailored to the specific requirements of either connected or inactive state. This local optimization improves reception efficiency in each state while managing complexity by activating only state-relevant parameters
Solution Approach 2:
A core set of configuration parameters is designed to be universal and applicable across both RRC connected and inactive states. These universal parameters include multicast group identifiers, basic reception parameters, and feedback mechanisms that function effectively in both states. This universality reduces parameter management complexity by eliminating the need for completely separate configuration sets while maintaining optimized performance in both states
Data Source
AI summary
A method of multicasting using small data transmission (SDT) includes receiving, by a user equipment (UE) while in a radio resource control (RRC) connected state, one or more configuration parameters associated with reception of multicast SDT data, transitioning, by the UE, from the RRC connected state to an RRC inactive state, receiving, while in the RRC inactive state, a notification indicating start of a multicast SDT session, and receiving multicast SDT data pursuant to the notification.