SL-PRS Congestion Control with CBR-Based Resource Timing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing congestion on sidelink sub-channels used for UE positioning, leading to sub-optimal utilization of resources and potential interference.
Innovation Solution
Implementing congestion control processing times for sidelink sub-channels based on channel busy ratio (CBR) measurements, allowing UEs to adapt their resource usage and select resources for communication at optimal times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If UEs use common congestion control processing times for all sidelink resources, then congestion control is simplified, but positioning accuracy and resource utilization deteriorate due to inability to differentiate positioning traffic from data traffic
Solution Approach 1:
The patent segments congestion control processing by introducing separate processing time parameters for positioning traffic (T_pos) and data traffic (T_data). This segmentation allows the system to handle positioning and data traffic differently, with positioning traffic receiving priority processing to ensure accurate positioning measurements even under congestion conditions.
Solution Approach 2:
The patent implements dynamic congestion control by adjusting processing times based on real-time channel conditions. The network entity configures different congestion control parameters (T_pos, T_data, and their ratios) based on observed traffic patterns and congestion levels, allowing the system to adapt positioning resource allocation dynamically while maintaining differentiation between positioning and data traffic handling.
2Reliability
If UEs prioritize positioning resources during congestion, then positioning reliability improves, but data transmission efficiency deteriorates
Solution Approach 1:
The patent changes key timing parameters (T_pos, T_data, and their ratio) to balance positioning reliability and data transmission efficiency. By adjusting these parameters based on congestion conditions, the system can guarantee minimum positioning performance (through T_pos) while allowing data transmission to utilize remaining resources efficiently (through T_data), achieving an optimal trade-off between the two competing objectives.
3Measurement precision
If UEs measure CBR frequently for congestion control, then resource selection accuracy improves, but processing overhead and energy consumption increase
Solution Approach 1:
The patent applies partial action by implementing selective and periodic CBR measurements rather than continuous monitoring. The system measures CBR at specific intervals and for specific resource pools, performing measurements only when necessary for congestion control decisions. This reduces energy consumption while maintaining sufficient measurement accuracy for effective resource selection and congestion management.
Data Source
AI summary
Techniques for accommodating for sidelink positioning in channel load management are disclosed. The techniques can include transmitting a message indicating a sidelink positioning reference signal (SL-PRS) congestion control processing capability of the UE, determining, in accordance with the SL-PRS congestion control processing capability of the UE, an applicable congestion control processing time value for congestion control of a first sidelink (SL) resource pool, the first SL resource pool comprising SL-PRS resources, measuring a channel busy ratio (CBR) of the first SL resource pool for a first slot, selecting, based on the measured CBR, a resource of the first SL resource pool for use to communicate during a second slot, wherein the second slot is offset in time from the first slot by the applicable congestion control processing time value, and communicating using the selected resource during the second slot.