Partial Sensing in Sidelink DRX for Resource Allocation
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Solution Overview
Problem
Current sidelink communication technologies face challenges in efficiently managing resource allocation and power consumption, particularly during sidelink discontinuous reception (SL DRX) inactive times, which affects the reliability and efficiency of sidelink transmissions.
Innovation Solution
The implementation of partial sensing techniques, such as periodic based partial sensing (PBPS) and contiguous partial sensing (CPS), during SL DRX inactive times allows user equipment (UE) to perform resource sensing and determine available resources for sidelink transmissions, optimizing the tradeoff between power saving and transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If full sensing is performed during SL DRX active time only, then power consumption is reduced, but resource allocation reliability deteriorates
Solution Approach 1:
The sensing operation is segmented into two distinct phases: full sensing during DRX active time for comprehensive resource assessment, and partial sensing during DRX inactive time for continued resource monitoring. This segmentation allows the system to balance power consumption with resource allocation reliability by performing less intensive sensing during inactive periods while maintaining enough awareness of resource availability.
Solution Approach 2:
Partial sensing is performed as a preliminary action during DRX inactive time to gather basic resource availability information before the active time begins. This preliminary sensing enables the UE to make informed decisions about resource allocation when active time arrives, reducing the need for continuous full sensing and thereby lowering overall power consumption while maintaining reliability.
2Reliability
If partial sensing is performed during SL DRX inactive time, then resource allocation reliability is improved, but power consumption increases
Solution Approach 1:
During DRX inactive time, the system performs partial sensing rather than full sensing. This partial action is sufficient to gather essential resource availability information and update the resource selection window, providing enough reliability for subsequent resource allocation decisions without the excessive energy consumption that would result from continuous full sensing operations.
Solution Approach 2:
Partial sensing is performed periodically during DRX inactive time at specific intervals rather than continuously. This periodic action maintains resource allocation reliability by updating the sensing results at sufficient intervals while dramatically reducing power consumption compared to continuous full sensing, as the UE only activates its sensing function at discrete moments rather than throughout the entire inactive period.
3Reliability
If sensing is performed continuously, then transmission reliability is maintained, but power saving capability deteriorates
Solution Approach 1:
The sensing operation is made dynamic by adjusting its intensity based on the DRX state. During DRX inactive time, the system transitions to partial sensing mode with reduced intensity, while during DRX active time, it switches to full sensing mode with higher intensity. This dynamic adaptation maintains transmission reliability when needed while maximizing power saving capability during inactive periods, eliminating the need for continuous constant-intensity sensing.
Solution Approach 2:
The sensing parameters such as sensing duration, frequency, and intensity are changed based on the DRX state. During inactive time, parameters are reduced to perform only essential partial sensing, while during active time, parameters are increased to perform comprehensive full sensing. This parameter change strategy maintains transmission reliability through adequate sensing when needed while significantly improving power saving capability by reducing sensing intensity during inactive periods.
Data Source
AI summary
A user equipment (UE) may perform partial sensing during a sidelink (SL) discontinuous reception (DRX) inactive time of the UE over a partial sensing occasion to obtain a sensing result. The partial sensing may include periodic based partial sensing (PBPS) or contiguous partial sensing (CPS), and the partial sensing occasion may include a sensing occasion determined on a most recent sensing occasion for PBPS or a minimum number of slots for CPS. The UE may determine, based on at least the sensing result, available resources for SL transmissions, and transmit a SL transmission over a resource of the available resources.