Sidelink DRX Resource Switching to Reduce LBT Failures
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Solution Overview
Problem
Existing sidelink communication technologies face issues with resource reselection due to interference and increased probability of LBT failures, leading to reduced throughput and communication reliability in discontinuous reception (DRX) cycles.
Innovation Solution
A first UE obtains a configuration with a first set of resources and conditions different from a second UE's DRX cycle to transmit sidelink data, and a second UE monitors for data using these resources, thereby reducing resource reselection and LBT failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single set of resources is used for DRX cycle monitoring, then device complexity is reduced, but communication reliability deteriorates due to interference and LBT failures
Solution Approach 1:
The resource set is divided into multiple subsets (first set of resources and second set of resources) with different characteristics. The first set is configured for normal DRX monitoring while the second set is configured for extended DRX or alternative monitoring scenarios. This segmentation allows the system to switch between different resource subsets based on channel conditions, LBT outcomes, or interference levels, thereby improving communication reliability without requiring a single complex resource configuration to handle all scenarios.
2Reliability
If resource reselection is performed frequently to avoid interference, then communication reliability improves, but loss of time increases due to repeated resource switching
Solution Approach 1:
Multiple resource sets are pre-configured before communication begins. The first set of resources and second set of resources are both established in advance with different characteristics (e.g., different time slots, frequency resources, or DRX parameters). When interference or LBT failure is detected, the system can immediately switch to the pre-configured alternative resource set without performing time-consuming resource reselection procedures, thus maintaining reliability while minimizing time loss.
3Use of energy by moving object
If DRX cycle parameters are optimized for power saving, then energy efficiency improves, but productivity decreases due to longer sleep intervals reducing data reception opportunities
Solution Approach 1:
The system dynamically adjusts DRX cycle parameters based on communication conditions. Multiple resource sets are configured with different DRX characteristics (e.g., different cycle lengths, on-duration timings, or monitoring occasions). The system can switch between these pre-configured resource sets depending on traffic patterns, channel conditions, or QoS requirements, allowing optimization of power consumption during low-activity periods while maintaining high productivity during active communication without requiring real-time DRX parameter reconfiguration.
Data Source
AI summary
A method of wireless communication at a first UE is disclosed herein. The method includes obtaining a configuration associated with a DRX cycle of a second UE, where the configuration includes a first indication of a first set of resources and at least one condition, where the first set of resources is different from a second set of resources utilized for the DRX cycle of the second UE. The method further includes transmitting, to the second UE based on an occurrence of the at least one condition, SL data via the first set of resources or the second set of resources.