Sidelink Inactivity Timer Synchronization via SCI Feedback
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Solution Overview
Problem
In 3GPP 5G New Radio wireless communication systems, the inactivity timer status for sidelink transmission is not consistently aligned among user equipment, leading to potential disruptions in data reception and transmission.
Innovation Solution
A method and apparatus for user equipment to determine and manage inactivity timers based on quality of service (QoS) configurations for logical channels, enabling synchronized timer management across user equipment in a sidelink transmission group through the transmission of sidelink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If DRX scheme with inactivity timer is introduced for sidelink transmission power saving, then power consumption is reduced, but inactivity timer status alignment among user equipment deteriorates
Solution Approach 1:
The transmitting UE includes timer indication information in the SCI to provide feedback to the receiving UE about the inactivity timer status. This feedback mechanism ensures both UEs have synchronized understanding of the timer state, resolving the alignment issue while maintaining power saving benefits
Solution Approach 2:
The SCI serves as an intermediary carrier that transmits timer indication information between UEs. This intermediary mechanism enables indirect synchronization of timer status without requiring direct UE-to-UE timer coordination, maintaining the autonomous power management capability
2Reliability
If inactivity timer is used to extend active time for continuously data reception, then data reception reliability is improved, but device complexity increases
Solution Approach 1:
The transmitting UE autonomously determines whether to start the inactivity timer based on its own transmission status and QoS requirements, then communicates this decision to the receiving UE. This self-service approach eliminates the need for complex coordinated timer management between UEs while ensuring reliable data reception
Solution Approach 2:
The inactivity timer configuration is dynamically adjusted based on QoS parameters of logical channels. By changing timer parameters according to service requirements rather than using fixed timer values, the system achieves reliable reception for different data types without increasing overall system complexity
Data Source
AI summary
A method and an apparatus for inactivity timer handling. The method includes: selecting at least one LCH for transmitting sidelink data to another user equipment; determining whether to start an inactivity timer, which is enabled, for the transmission of the sidelink data based on an inactivity timer configuration of at least one QoS of the at least one LCH contained in the sidelink data; and if it is determined to start the inactivity timer, starting the inactivity timer for the transmission of the sidelink data.