Sidelink DRX Configuration Ranking for UE Wake Cycle Alignment
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Solution Overview
Problem
Existing wireless communication systems face challenges in implementing discontinuous reception (DRX) on sidelinks due to the lack of a central point for synchronizing DRX cycles among user devices, leading to increased power consumption in devices with limited power supplies.
Innovation Solution
Implementing DRX on sidelinks by ranking multiple DRX configuration sources and selecting the highest-ranked source, using fixed or adaptive DRX cycles based on UE parameters and environment, aligning DRX cycles with access points or other UEs, and optimizing ON durations for power-saving purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DRX cycles are not synchronized among user devices on sidelinks, then each device must continuously monitor for communications, but power consumption increases significantly
Solution Approach 1:
The patent introduces a synchronization reference mechanism where one UE acts as a reference for DRX cycle synchronization. This intermediary approach allows devices to coordinate their DRX cycles without continuous monitoring, reducing power consumption while maintaining communication reliability through synchronized wake-up periods.
Solution Approach 2:
The patent implements periodic DRX cycles with synchronized wake-up periods where UEs actively monitor for communications. During these periodic wake-up intervals, devices can efficiently exchange data and synchronize their next sleep period, avoiding continuous monitoring while ensuring reliable communication at predetermined intervals.
2Adaptability or versatility
If multiple DRX configuration sources are available without ranking, then devices can flexibly select sources, but selection complexity and configuration overhead increase
Solution Approach 1:
The patent introduces ranking parameters to order multiple DRX configuration sources hierarchically. Each source is assigned a rank value that determines selection priority, transforming the complex multi-source selection problem into a simple ranked choice process. This maintains adaptability by allowing multiple sources while reducing selection complexity through parameter-based ordering.
Solution Approach 2:
The patent segments the set of DRX configuration sources into ranked categories or levels. By dividing sources into hierarchical groups with different ranks, the system simplifies the selection process while preserving the ability to adapt to different scenarios by selecting from appropriate rank levels based on current communication needs.
Data Source
AI summary
A user device, UE, for a wireless communication system is described. The wireless communication system has a plurality of user devices, UEs. The UE communicates with one or more further UEs using a sidelink, SL. To operate in a Discontinuous Reception, DRX, mode, the UE receives a DRX configuration from one of a plurality of DRX configuration sources. The plurality of DRX configuration sources are ranked such that each of the DRX configuration sources has a rank different from the remaining DRX configuration sources, and the UE is to select the DRX configuration from the DRX configuration source having the highest rank among the available DRX configuration sources.