Sidelink Power Control Using CSI Feedback for Reliable Decoding
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Solution Overview
Problem
Current sidelink communication resource selection based on interference intensity fails to ensure successful decoding of receiving UEs and does not achieve optimal system performance.
Innovation Solution
Implement distributed power control by transmitting terminals sending CSI-RS in frequency domain units, detecting CSI from multiple receiving terminals, and updating transmit powers based on reported CSI to improve resource utilization and spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resource selection is based only on interference intensity, then resource selection is simplified, but successful decoding of receiving UEs cannot be ensured and optimal system performance cannot be achieved
Solution Approach 1:
The patent changes the parameter basis for resource selection from only interference intensity to include both interference intensity and channel state information. By measuring CSI (channel quality indicator, signal-to-interference-plus-noise ratio) in addition to interference levels, the system selects resources based on composite criteria that ensure both simplified operation and reliable decoding, resolving the contradiction between complexity and reliability
Solution Approach 2:
The patent implements feedback mechanisms where receiving UEs report CSI to transmitting UEs, and transmitting UEs use this feedback to make informed resource selection decisions. This feedback loop enables the system to adapt to channel conditions and interference levels dynamically, ensuring reliable decoding while maintaining manageable complexity through structured information exchange
2Adaptability or versatility
If distributed resource allocation is used without power control, then resource selection flexibility is improved, but resource utilization and spectrum efficiency are suboptimal
Solution Approach 1:
The patent introduces dynamic power control to the distributed resource allocation system. Transmitting UEs adjust their transmit power based on measured CSI and interference conditions, enabling the system to adaptively optimize resource utilization. This dynamic adjustment maintains the flexibility of distributed allocation while improving productivity through power optimization
Solution Approach 2:
The patent changes the power level parameter dynamically based on channel conditions and interference measurements. By adjusting transmit power according to CSI feedback and interference intensity, the system optimizes spectrum efficiency and resource utilization while preserving the adaptability benefits of distributed resource allocation
Data Source
AI summary
A first transmitting terminal sends a first channel state information-reference signal CSI-RS in N frequency domain units, where N is a positive integer. The first transmitting terminal detects channel state information CSI sent by K receiving terminals, where the CSI sent by the K receiving terminals is determined based on the first CSI-RS, and K is a positive integer. The first transmitting terminal updates a transmit power of the first transmitting terminal in the N frequency domain units based on the CSI sent by the K receiving terminals. When updated powers of F frequency domain units in the N frequency domain units are greater than a preset threshold, the first transmitting terminal sends user data in at least one of the F frequency domain units, where F is a positive integer less than or equal to N.