Partial Sensing Resource Allocation for DRX-Aware V2X Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current mechanisms of device-to-device (D2D) and vehicle-to-everything (V2X) communications are inadequate for certain V2X-based use cases, particularly in managing resource selection and congestion control in discontinuous reception (DRX) scenarios.
Innovation Solution
A transmitting wireless transmit/receive unit (Tx WTRU) determines resource selection windows and adjusts candidate resources based on the active and inactive times of a receiving wireless transmit/receive unit (Rx WTRU), performs congestion control, and selects transmission resources within the Rx WTRU's active time, using quality of service (QoS) and channel busy ratio (CBR) measurements to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Tx WTRU performs resource selection for D2D/V2X communications, then data transmission can be enabled, but resource collision and congestion may occur when multiple WTRUs select resources simultaneously
Solution Approach 1:
The patent applies preliminary sensing action by requiring WTRUs to sense the channel for a predetermined duration (e.g., T1 duration) before resource selection. This preliminary sensing identifies resources already occupied by other WTRUs, allowing the selecting WTRU to avoid those resources and reduce collisions. The sensing window is configured to occur before the resource selection window, enabling proactive collision avoidance.
Solution Approach 2:
The patent implements feedback mechanisms where WTRUs measure channel busy ratio (CBR) and reference signal received power (RSRP) of sensed signals. These measurements provide feedback about channel conditions and resource occupancy, which are used to adjust resource selection decisions. The feedback loop enables dynamic adaptation to changing channel conditions and reduces resource collisions.
2Reliability
If a Tx WTRU increases the number of candidate resources for selection, then the probability of finding an available resource increases, but the complexity of resource selection and processing increases
Solution Approach 1:
The patent segments the resource selection process into distinct phases: sensing phase, candidate resource identification phase, and final selection phase. The sensing window and resource selection window are separated in time, allowing the WTRU to process information in manageable segments rather than all at once. This segmentation reduces processing complexity while maintaining resource availability.
Solution Approach 2:
The patent applies partial action by requiring sensing only for a portion of the resource pool (specific T1 duration) rather than the entire resource pool. The WTRU identifies candidate resources based on partial sensing results and selects from those candidates. This partial sensing approach reduces processing complexity while still providing sufficient candidate resources for reliable transmission.
3Reliability
If a Tx WTRU waits for Rx WTRU active time to ensure successful reception, then transmission reliability improves, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by having the Tx WTRU sense the channel and identify suitable resources before the Rx WTRU's active time begins. The sensing window is configured to occur before the resource selection window, which in turn occurs before or during the Rx active time. This preliminary preparation allows the Tx WTRU to have transmission-ready resources identified in advance, reducing actual transmission delay while ensuring the Rx WTRU is active to receive.
Solution Approach 2:
The patent implements dynamic resource selection where the Tx WTRU adapts its resource selection based on sensed channel conditions and estimated Rx WTRU activity patterns. The system dynamically adjusts the resource selection window timing and candidate resource identification to align with predicted Rx active periods, optimizing both reliability and delay based on real-time conditions.
4Measurement precision
If a Tx WTRU performs extensive sensing and channel measurements, then resource selection accuracy improves, but energy consumption and processing load increase
Solution Approach 1:
The patent applies partial action by requiring sensing only for a specific duration T1 within the overall resource selection period, and only for a portion of the resource pool. The WTRU performs measurements on selected candidate resources rather than all available resources. This partial sensing approach maintains sufficient measurement precision for accurate resource selection while significantly reducing energy consumption and processing load compared to exhaustive sensing.
Data Source
AI summary
A transmitting wireless transmit/receive unit (Tx WTRU) may receive configuration information that indicates one or more parameters. The one or more parameters may be associated with resource selection. The Tx WTRU may determine a first resource selection window and a second resource selection window. The first resource selection window may be associated with an active time of a receiving wireless transmit/receive unit (Rx WTRU). The second resource selection window may be associated with an inactive time of the Rx WTRU. The Tx WTRU may determine a first number of candidate resources associated with the first resource selection window. The Tx WTRU may determine a first number of candidate resources associated with the second resource selection window. In examples, the Tx WTRU may increase the first number of candidate resources associated with the first resource selection window to a second number of candidate resources associated with the first resource selection window.