NR V2X Mode 2 Resource Selection with Partial Sensing
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Solution Overview
Problem
Existing NR V2X resource selection methods consume excessive power in pedestrian UEs (PUEs) due to continuous monitoring, leading to limited sensing capability and increased collision risks, especially with aperiodic traffic.
Innovation Solution
Implement partial sensing and random resource selection techniques, along with mandated sensing durations and reduced resource reservations, to conserve power while minimizing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of all subchannels is performed to detect SCI and identify occupied resources, then collision avoidance capability is improved, but power consumption increases significantly
Solution Approach 1:
The patent applies partial sensing by requiring UEs to monitor only a subset of subchannels (e.g., first subset of subchannels) rather than all subchannels continuously. This partial monitoring approach maintains adequate collision avoidance capability while significantly reducing power consumption, especially for pedestrian UEs with limited power budgets.
Solution Approach 2:
The patent implements periodic sensing opportunities where UEs wake up at specific intervals to perform sensing and resource selection, then return to sleep mode. This periodic action pattern allows UEs to maintain communication reliability while consuming far less power compared to continuous monitoring, as sensing is performed only at designated sensing opportunities rather than continuously.
2Use of energy by moving object
If pedestrian UEs sleep for extended durations to preserve power, then power consumption is reduced, but sensing capability deteriorates and collision risks increase
Solution Approach 1:
The patent requires power-saving UEs to perform sensing for a mandated duration before their initial transmission attempt. This preliminary sensing action ensures that UEs have adequate sensing capability to identify occupied resources and avoid collisions before they begin transmitting, thereby maintaining reliability despite extended sleep periods for power conservation.
Solution Approach 2:
The patent introduces a power saving indicator parameter that UEs can set to indicate their limited power status. This parameter change triggers special resource selection behavior from other UEs (such as avoiding resources that would collide with the power-saving UE's transmission), thereby maintaining collision avoidance reliability even when the power-saving UE has reduced sensing capability.
3Use of energy by moving object
If power saving UEs perform random resource selection to reduce sensing, then power consumption is reduced, but collision protection capability deteriorates
Solution Approach 1:
The patent requires power-saving UEs to perform sensing on at least a first subset of subchannels before random resource selection, rather than completely skipping sensing. This partial sensing action provides some collision protection capability while still significantly reducing power consumption compared to full sensing across all subchannels.
Solution Approach 2:
The patent uses the power saving indicator as an intermediary mechanism that communicates the UE's power-constrained status to other UEs. This intermediary allows other UEs to adjust their resource selection to avoid colliding with power-saving UEs, thereby providing collision protection without requiring the power-saving UE to perform extensive sensing.
4Reliability
If power saving UEs are restricted to limited subchannels for initial transmission, then collision probability is reduced, but resource selection flexibility deteriorates
Solution Approach 1:
The patent segments the available subchannels into different subsets (e.g., first subset for initial transmission, second subset for subsequent transmissions). This segmentation allows power-saving UEs to have restricted resource selection for initial transmission (reducing collision probability) while maintaining flexibility for subsequent transmissions after they have accumulated more sensing information or established their transmission pattern.
Data Source
AI summary
A UE apparatus is provided for NR V2X Mode 2 resource selection. The UE apparatus includes a transceiver; and a processor configured to monitor for aperiodic traffic in an aperiodic sensing window, determine a resource for transmitting data in a resource selection window, based on the monitoring, and transmit, via the transceiver, data using the determined resource. The aperiodic sensing window includes a mandated sensing duration for detection of the aperiodic traffic prior to transmission by the transceiver, and the mandated sensing duration is at least equal to a signaling window of the UE before an initial transmission, in response to a PDB being greater than or equal to the signaling window of the UE.