Sidelink Power Control for Uu and SL Interference Mitigation
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Solution Overview
Problem
The issue of mutual interference between sidelink (SL) and Uu air interface communication due to the use of the same time-frequency resources affects decoding performance in wireless communication systems.
Innovation Solution
A sidelink power control method that involves a terminal device receiving indication information for power adjustments based on path loss and resource block allocation to minimize interference, using predefined adjustment values and power control formulas to determine optimal transmit power for sidelink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink and Uu transmissions use the same time-frequency resource, then resource utilization is improved, but mutual interference increases and decoding performance deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the sidelink transmit power based on path loss measurements and network device indications. The terminal device calculates transmit power using formulas that incorporate path loss compensation factors and adjustment values, transforming the fixed power parameter into a dynamically optimized value that resolves interference while maintaining resource utilization
2Reliability
If sidelink transmit power is increased, then transmission reliability is improved, but interference to Uu transmission increases
Solution Approach 1:
The patent implements feedback mechanisms where the network device monitors sidelink transmission conditions and sends indication information to terminal devices. The terminal devices measure path loss and report metrics to the network, which then provides adjusted power control parameters. This closed-loop feedback system enables dynamic optimization of transmit power to maintain reliability while minimizing interference to Uu transmissions
3Adaptability or versatility
If dynamic coexistence mechanism is introduced, then flexibility is improved, but complexity of power control increases
Solution Approach 1:
The patent introduces the network device as an intermediary that manages the complexity of dynamic coexistence. The network device receives path loss measurements from terminal devices, calculates appropriate power adjustment values, and sends control indications to terminal devices. This intermediary approach enables flexible adaptive coexistence while offloading the computational complexity from terminal devices to the network infrastructure
Data Source
AI summary
This application provides a sidelink power control method and apparatus. The sidelink power control method includes: A first terminal device receives first indication information sent by a network device, where the first indication information indicates a first adjustment value corresponding to a first transmission occasion, the first transmission occasion corresponds to at least one symbol, and the first adjustment value is used for determining first transmit power. The first terminal device sends sidelink information to a second terminal device on the first transmission occasion based on the first transmit power. According to the foregoing method, a problem that decoding performance of Uu transmission and decoding performance of SL transmission are affected due to excessively large interference between Uu and an SL when a same time-frequency resource is used for the Uu and the SL can be avoided.