Distance-Based COT Sharing for V2X Congestion Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently sharing channel occupancy time (COT) without causing network congestion, particularly in vehicle-to-everything (V2X) systems, where resource allocation techniques can lead to significant network congestion.
Innovation Solution
Implementing distance-based COT sharing configurations that determine sharing parameters based on the approximate distance between devices, using semi-static or dynamic signaling, to optimize COT sharing conditions and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If COT sharing is implemented without distance-based parameters, then spectrum utilization is improved, but network congestion increases
Solution Approach 1:
The patent applies local quality by differentiating COT sharing parameters based on distance zones. Devices at different distances from the gNB are assigned different COT sharing configurations, allowing closer devices to share more aggressively while distant devices use more conservative parameters. This spatial differentiation optimizes spectrum utilization locally while preventing overall network congestion.
Solution Approach 2:
The patent changes key parameters (COT duration, power thresholds, resource allocation) based on distance metrics. By dynamically adjusting these parameters according to the distance between devices and gNB, the system achieves efficient spectrum utilization for nearby devices while maintaining network stability for distant devices, thus resolving the contradiction between productivity and harmful effects.
2Object-generated harmful factors
If distance-based COT sharing is implemented, then network congestion is reduced, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling devices to autonomously determine their distance from the gNB and select appropriate COT sharing parameters from pre-configured tables. Devices perform self-assessment of their location and automatically adjust their transmission parameters without requiring complex centralized control, thereby reducing network congestion while keeping individual device complexity manageable.
Solution Approach 2:
The patent applies preliminary action by pre-configuring COT sharing parameter tables with distance-based thresholds before operation. Devices simply measure their distance and look up the corresponding parameters, avoiding real-time complex calculations. This preparatory configuration reduces runtime device complexity while maintaining effective congestion control.
3Device complexity
If approximate distance measurement is used for COT sharing, then device complexity is reduced, but measurement precision decreases
Solution Approach 1:
The patent uses inexpensive, simplified distance estimation methods (such as pathloss-based calculations or signal strength thresholds) rather than precise measurement techniques. These approximate distance measurements are sufficient for selecting COT sharing parameter ranges, achieving acceptable performance with minimal device complexity while avoiding the need for expensive or complex positioning systems.
Data Source
AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for distance-based channel occupancy time (COT) sharing. In one aspect, a first device, such as a user equipment (UE), may determine an approximate distance between itself and a second device. The first device may receive a COT sharing configuration including a set of COT sharing parameters for sharing a COT of the communications link with the second device based on the distance between the two devices. The first device may determine conditions for sharing the COT based on the COT sharing configuration and the approximate distance between the two devices. Additionally, or alternatively, the first device may determine conditions for sharing the COT based on the COT sharing configuration and a power metric of communications between the two devices.