5G Sidelink Reservation Thresholds for Collision-Aware Flow Access
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Solution Overview
Problem
The existing 5G/B5G sidelink semi-persistent scheduling lacks an effective mechanism to differentiate collision areas for different types of flows, leading to increased contention collision probability and access delay, particularly in Vehicle-to-Everything (V2X) communication.
Innovation Solution
An adaptive extended keeping reservation threshold probability mechanism with a resource watching window and dynamic back-off is introduced, utilizing a flow differentiating module, flow guarantee module, and collision differentiating module to reduce contention collisions by applying an adaptive extended Sigmoid function and dynamic truncated binary exponential back-off algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified resource reservation mechanism is used for all flow types, then the system is simple to implement, but contention collision probability increases significantly
Solution Approach 1:
The patent segments the collision domain into flow-type-specific collision domains, where each flow type (e.g., URLLC, eMBB, mMTC) has its own dedicated collision domain. This segmentation isolates different flow types from each other, reducing cross-flow contention collisions while maintaining manageable complexity within each segment.
Solution Approach 2:
The patent applies local quality by configuring different resource reservation parameters (such as reservation intervals, sensing window sizes, and back-off factors) specifically tailored to each flow type's characteristics. For example, URLLC flows receive more aggressive resource reservation settings to ensure low latency, while eMBB flows use more conservative settings to maximize throughput.
2Reliability
If NRT flow uses longer resource reservation interval, then collision area is differentiated, but RT flow with shorter interval experiences more contention collisions
Solution Approach 1:
The patent implements dynamic resource reservation intervals that adapt based on current channel conditions, collision history, and flow type requirements. The system dynamically adjusts the resource reservation interval for each flow type in real-time, allowing RT flows to use shorter intervals when channel conditions are favorable while NRT flows use longer intervals when collisions are detected.
Solution Approach 2:
The patent changes key parameters such as the resource reservation interval, sensing window size, and back-off exponent based on flow type and current system state. For RT flows experiencing collisions, the system dynamically reduces the resource reservation interval and adjusts back-off parameters to enable faster retransmission attempts, thereby reducing access delay.
3Ease of operation
If back-off mechanism is neglected to simplify processing, then system operation is easier, but contention collision amount increases
Solution Approach 1:
The patent implements a self-service back-off mechanism where user equipment automatically applies exponential back-off algorithms after detecting collisions within its flow-type-specific collision domain. The system autonomously adjusts transmission delays and resource selection without requiring complex centralized coordination, simplifying operation while effectively reducing collision amounts through distributed intelligence.
Data Source
AI summary
An adaptive extended keeping reservation threshold probability mechanism system with resource watching window and dynamic back-off for contention-based 5G/B5G sidelink and a method thereof are disclosed. An adaptive extended Sigmoid mechanism can be applied to reduce a contention collision probability for the different types of flows contending a usage resource; a watching window can be applied to guarantee certain probability and reserve resource for a high priority flow; using dynamic truncated binary exponential (TBE) back-off mechanism can stagger the flows occurring resource collision to avoid the same consecutive collision, so as to effectively reduce contention collision probability, and improve resource usage rate and the probability of successful flow transmission. Therefore, the effect of minimizing collision probability and access delay and maximizing successful probability and throughput can be achieved.