Sidelink HARQ-ACK Transmit Power Control for V2X Priority Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In NR V2X systems, determining the optimal transmit power for multiple HARQ-ACKs on a sidelink is challenging due to varying pathlosses between receivers, which can lead to interference issues and incorrect reception of priority signals.
Innovation Solution
A method where the transmit power for HARQ-ACKs is determined based on the configuration parameters and pathloss of the higher-priority signal, ensuring the reception of the higher-priority signal while avoiding interference, applicable to both Code Division Multiplexing (CDM) and Frequency Division Multiplexing (FDM) scenarios, and considering the pathloss of cellular links to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different transmit power values are used for multiple HARQ-ACKs based on their respective pathlosses, then the reception reliability for each signal is improved, but the complexity of power control and potential interference between signals increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different signals based on their priority levels. Higher priority signals receive different power control treatment compared to lower priority signals, allowing optimized power management for each signal type while maintaining overall system simplicity. The method determines transmit power based on the highest priority signal's pathloss, applying uniform power control to all signals in a given set rather than individualized power control for each signal.
Solution Approach 2:
The patent segments the power control approach by dividing signals into priority-based groups. Instead of managing power for each individual signal separately, the system segments the power control process into priority levels, where all signals of a certain priority level receive the same power control treatment. This segmentation simplifies the control mechanism while ensuring reliable reception for the most critical signals.
2Device complexity
If uniform transmit power is used for all HARQ-ACKs, then the power control complexity is reduced, but signals with larger pathloss may not be received correctly
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the transmit power parameter based on the priority levels and pathloss characteristics of the signals. Rather than using a fixed uniform power level, the system changes the power parameter according to the highest priority signal's pathloss measurement. This allows the system to maintain simple uniform power control methodology while adapting the actual power level to ensure reliable reception for all signals in the set.
3Area of stationary object
If transmit power is increased to ensure reception of lower-priority signals, then coverage is improved, but interference with higher-priority signals and other frequency bands increases
Solution Approach 1:
The patent applies local quality by tailoring the power control strategy to the specific characteristics of different signal types and their priorities. Instead of uniformly increasing power for all signals, the system applies differentiated power control where higher priority signals receive appropriate power levels that prevent interference, while lower priority signals are transmitted at levels that ensure their reception without causing excessive interference to other frequency bands.
Solution Approach 2:
The patent applies preliminary anti-action by proactively managing transmit power levels to prevent interference before it occurs. By determining the transmit power based on the highest priority signal's pathloss and applying uniform power control to all signals, the system preemptively prevents power-related interference between different signal types and frequency bands, rather than addressing interference issues after they arise.
Data Source
AI summary
The disclosure provides a method and a device in a node for wireless communication. A first node receives a first signal and a second signal, and the first node transmits a first information block and a second information block in a first time window. The first information block and the second information block are used for determining whether the first signal and the second signal are correctly received respectively; transmit power values of physical layer channels carrying the first information block and the second information block are both a first power value. Through the design in the disclosure, a transmit power of a feedback channel on a sidelink is associated with a priority; and when multiple feedback channels are transmitted in one same time window, a proper transmit power can be determined to optimize performances of the feedback channels on the sidelink.


