Sidelink Resource Sensing Window Adaptation for Power and Collision Trade-offs
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Solution Overview
Problem
In sidelink (SL) transmission, user equipment (UE) faces challenges in efficiently selecting and reserving resources due to high power consumption and potential resource collisions, especially for power-sensitive UEs, as existing methods often result in long sensing windows that increase power usage and collision risks.
Innovation Solution
The UE adaptively adjusts the resource sensing window size based on parameters like packet delay budget (PDB), detected discontinuous transmission (DTX) states, acknowledgement (ACK) states, congestion ratio (CR), and channel busy ratio (CBR), and divides the sensing and selection windows into sub-windows to optimize resource utilization and reduce collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses a long resource sensing window to ensure reliable resource selection, then resource collision risk is reduced, but power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the resource sensing window size based on channel conditions. When channel conditions are good (low CBR), the sensing window is reduced to save power. When conditions deteriorate (high CBR or packet loss), the window is extended to ensure reliable resource selection. This dynamic adaptation resolves the contradiction by making the sensing window length variable rather than fixed.
Solution Approach 2:
The patent changes the parameter of sensing window size based on measured channel conditions including CBR, packet loss rate, and DTX detection. By adjusting this key parameter according to actual channel state, the system achieves both power efficiency and reliability - using shorter windows when possible and longer windows only when necessary for collision avoidance.
2Reliability
If the UE extends the resource sensing window to capture more resources, then resource selection reliability improves, but the time required for SL transmission increases
Solution Approach 1:
The sensing window duration is dynamically adjusted based on channel conditions and packet delay budget. In good channel conditions, a shorter sensing window is used to reduce time loss. When channel conditions require more extensive sensing for reliability, the window is extended but constrained by the PDB to prevent excessive delay. This dynamic approach balances reliability and time efficiency.
Solution Approach 2:
The UE performs sensing operations in advance within the configured sensing window before actual resource selection and transmission. By conducting preliminary resource assessment and selection ahead of time, the system ensures reliable resource availability while minimizing the impact on actual transmission timing, thus reducing overall time loss.
3Reliability
If the UE performs comprehensive sensing to avoid resource collisions, then transmission reliability improves, but device complexity increases
Solution Approach 1:
The patent segments the sensing procedure into distinct components: CBR measurement, DTX state detection, ACK/NACK monitoring, and resource selection. Each component operates with specific thresholds and rules. This segmentation reduces complexity by breaking down the comprehensive sensing into manageable, independently configurable parts while maintaining overall transmission reliability.
Solution Approach 2:
The sensing mechanism incorporates feedback loops where the UE monitors channel conditions (CBR, packet loss, DTX states) and adjusts sensing behavior accordingly. This feedback-driven approach ensures reliable transmission by adapting sensing comprehensiveness to actual channel needs, avoiding unnecessary complex sensing when conditions are already favorable.
4Ease of manufacture
If the UE uses a fixed resource selection window size, then configuration simplicity is maintained, but adaptability to different channel conditions deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of the resource selection window size based on measured channel conditions including CBR, packet loss rate, and DTX detection. The window size adapts to channel quality - expanding in poor conditions and contracting in good conditions - while maintaining configuration simplicity through automated adaptation rules that eliminate the need for manual reconfiguration.
Solution Approach 2:
The UE autonomously adjusts its resource selection window size based on its own measurements of channel conditions. The device serves itself by automatically adapting to varying channel environments without requiring external reconfiguration, thus maintaining configuration simplicity while achieving high adaptability to different channel conditions.
Data Source
AI summary
Disclosed are methods and apparatuses for performing sensing-based resource selection and sidelink (SL) transmission. One embodiment of the subject application provides a method performed by a user equipment, including determining a resource sensing window size of a resource sensing window after a resource selection triggering event at least according to a packet delay budget (PDB) and/or at least one parameter for performing sensing-based resource selection and SL transmission, and/or dividing the resource sensing window and a resource selection window into a number of pairs of resource sensing sub-window and resource selection sub-window for performing sensing-based resource selection and SL transmission.