Sidelink DRX Resource Selection Offsets for Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in NR sidelink, there is a challenge in avoiding resource collisions during discontinuous reception (DRX) due to autonomous resource selection by UEs, which can lead to increased latency and reduced power efficiency.
Innovation Solution
A method involving configuring offset start times for resource selection windows based on DRX cycles, using identifiers and dynamic adjustments to avoid collisions, and employing sub-pools to distribute resource selection evenly across DRX periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If autonomous resource selection by UEs is used during DRX, then power efficiency is improved, but resource collisions increase
Solution Approach 1:
The patent applies parameter changes by introducing offset values that shift the resource selection window start times relative to DRX cycle boundaries. Different UEs are assigned different offsets, which changes the temporal parameter of resource selection to avoid collisions while maintaining DRX power-saving operation. The offset parameter is configured to distribute UEs across different time slots within the DRX cycle.
Solution Approach 2:
The patent implements dynamics by making the resource selection window start time flexible rather than fixed. The start time is dynamically adjusted based on the configured offset and DRX cycle parameters, allowing the system to adapt resource allocation timing to avoid collisions while maintaining autonomous selection capability during DRX periods.
2Loss of time
If resource selection window starts at DRX on-duration, then latency is reduced, but resource collisions increase
Solution Approach 1:
The patent changes the temporal parameter of resource selection by introducing an offset from the DRX on-duration start time. This offset parameter allows the resource selection window to start at different times for different UEs, reducing collisions while maintaining low latency by keeping the window within the same DRX cycle.
Solution Approach 2:
The patent segments the resource selection timing by dividing the DRX cycle into multiple possible start time positions using different offsets. This segmentation distributes UEs across different time segments within the DRX cycle, reducing collisions while ensuring each UE can still access resources promptly within its assigned segment.
3Extent of automation
If multiple UEs select resources independently, then autonomy is maintained, but resource distribution becomes uneven
Solution Approach 1:
The patent applies parameter changes by configuring different offset values for different UEs, which transforms the uniform autonomous selection into a distributed pattern. The offset parameter acts as a configuration that guides autonomous UEs to select resources at different times, achieving uniform distribution while maintaining automation.
Solution Approach 2:
The patent implements feedback mechanisms where UEs sense channel conditions and resource usage before making autonomous selections. This feedback loop allows UEs to adjust their resource selection based on observed usage patterns, achieving more uniform distribution while maintaining autonomous operation.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for resource collision avoidance in sidelink for discontinuous reception (DRX). For example, certain embodiments described herein may help to ensure a reliable method for reaching a power saving solution for an autonomous resource selection, using a fixed set of rules, based on concepts of sub-pools. This may be done by indicating a set of resources to user equipment (UEs), which may be used for sensing and selection. The resources provided may be offset by a number of resources selected at random, based on UE-identifier, or as otherwise indicated.