Channel Occupancy Ratio Weighting for PSSCH Congestion Control
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Solution Overview
Problem
There is a need for improved congestion control in sidelink (SL) communication to enhance the reliability and efficiency of wireless communication systems, particularly in scenarios involving direct device-to-device communication.
Innovation Solution
A method and apparatus for a user equipment (UE) to transmit physical sidelink shared channel (PSSCH) based on channel occupancy ratio (CR) threshold management, applying weighting factors to determine efficient resource allocation and transmission, and a base station configuring UE parameters for SL communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If weighting factors are applied to scheduled resources for PSSCH transmission, then channel occupancy ratio calculation becomes more accurate and resource allocation efficiency improves, but calculation complexity and processing overhead increase
Solution Approach 1:
The patent applies weighting factors as adjustable parameters to the channel occupancy ratio calculation formula. Different weighting factors (e.g., 0.5, 0.25, 0.125) are applied to different scheduled resources based on their importance or interference potential. This parameter-based approach allows flexible optimization of resource allocation efficiency while managing calculation complexity through standardized weight values.
2Productivity
If channel occupancy ratio is calculated with multiple weighting factors for multiple scheduled resources, then resource utilization optimization improves, but processing time and computational load increase
Solution Approach 1:
The patent implements a selective weighting approach where not all scheduled resources require full calculation with multiple weighting factors. Instead, weighting factors are applied selectively based on resource characteristics, such as whether the resource is newly scheduled or previously used. This partial application of complex calculation reduces processing time while maintaining resource utilization optimization for critical resources.
3Reliability
If channel occupancy ratio threshold is enforced for PSSCH transmission, then congestion control and conflict reduction improve, but transmission opportunities may be restricted
Solution Approach 1:
The patent implements dynamic threshold adjustment where the channel occupancy ratio threshold is not fixed but adapts based on channel conditions, traffic load, and historical performance. When channel conditions are good and load is low, the threshold is relaxed to allow more transmission opportunities. When congestion is detected or interference is high, the threshold is tightened to maintain reliability. This dynamic approach balances congestion control with transmission opportunity preservation.
Data Source
AI summary
A base station may instruct a UE to use at least one weighting factor associated with a CR for the UE, and the UE may apply the at least one weighting factor to the one or more resources scheduled for the PSSCH transmission to determine the CR. The UE may transmit the PSSCH in the one or more resources of the at least one slot based on the determined CR being less than or equal to a CR threshold value. The at least one weighting factor may be applied to the one or more resources in each of multiple slots scheduled for transmission of a PSSCH.