Sidelink Event Notification for DRX Timer Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in sidelink groups, there is a challenge in synchronizing the starting or restarting of sidelink discontinuous reception (DRX) inactivity timers among user devices, leading to misalignment and potential data losses due to missed detection of events that trigger operations specific to the group.
Innovation Solution
A method where a user device detects a sidelink-related event, such as a sidelink DRX inactivity timer starting or restarting event, and transmits a notification via a sidelink group-specific resource to synchronize the timers among all user devices in the group, ensuring they remain in an active state until the timer expires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If user devices independently start/restart sidelink DRX inactivity timers based on local event detection, then each device can operate autonomously, but timer synchronization among group members deteriorates leading to misalignment
Solution Approach 1:
A user device that detects a sidelink-related event transmits a notification to other user devices in the sidelink group. This feedback mechanism ensures that all devices are aware of events that trigger DRX inactivity timer operations, enabling them to synchronize their timers independently without centralized control. The notification acts as feedback information that propagates event occurrence to the entire group, resolving the synchronization issue while preserving autonomous operation.
2Reliability
If user devices monitor for sidelink events continuously, then event detection reliability is improved, but power consumption increases
Solution Approach 1:
User devices utilize sidelink discontinuous reception (DRX) to periodically monitor for sidelink-related events instead of continuous monitoring. The devices enter sleep modes between monitoring periods, significantly reducing power consumption. When a device detects an event during its monitoring period, it transmits a notification to ensure other devices are informed, maintaining detection reliability while enabling energy-efficient periodic operation.
3Use of energy by moving object
If user devices use sidelink discontinuous reception to reduce power consumption, then energy efficiency is improved, but event detection capability deteriorates due to missed events during sleep periods
Solution Approach 1:
When a user device detects a sidelink-related event during its active monitoring period, it acts as an intermediary by transmitting a notification to other group members. This notification mechanism compensates for the reduced detection capability of devices in sleep modes, ensuring that all devices can synchronize their DRX inactivity timers based on the notified event, thus maintaining reliability while preserving energy efficiency.
Data Source
AI summary
A method includes causing or detecting, by a user device that is a member of a sidelink group of user devices, a sidelink-related event that triggers an operation associated with the sidelink-related event and specific to the sidelink group; and transmitting a notification of the sidelink-related event via a sidelink group-specific resource, in order to synchronize, among user devices of the sidelink group including any user device of the sidelink group that failed to detect the sidelink-related event, the performing by the user devices of the sidelink group of the operation associated with the sidelink-related event and specific to the sidelink group.