Sidelink TX Power Control via Beamforming Link Selection
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Solution Overview
Problem
Conventional sidelink transmission power control in wireless communication systems fails to account for beam forming in mmWave and multiple access links, leading to inefficient power management and interference issues.
Innovation Solution
A method for selecting the most appropriate access link based on the spatial relationship between sidelink and access link beams, determining sidelink transmission power using a combination of downlink and sidelink pathloss, and adjusting power levels to minimize interference, allowing for higher sidelink transmission power in certain scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SL open-loop power control uses both DL pathloss and SL pathloss, then power control is performed, but the minimum of the power values is taken which leads to undesirable results and does not account for beam forming in mmWave
Solution Approach 1:
The patent changes the parameters used in power control from simply DL pathloss and SL pathloss to include beamforming-specific parameters such as beam directions, beam gains, and spatial relationships. This allows the power control to adapt to mmWave beamforming scenarios while maintaining accurate power determination.
Solution Approach 2:
The patent segments the power control process into multiple independent components: DL pathloss calculation, SL pathloss calculation, beamforming parameter determination, and final power synthesis. This segmentation allows each component to be optimized independently, particularly enabling proper handling of beamforming without compromising overall power control accuracy.
2Device complexity
If conventional SL open-loop power control schemes are used, then power control is simplified, but they do not account for multiple access links that can be used during communication between a UE and a base station
Solution Approach 1:
The patent creates a universal power control mechanism that can handle multiple access link scenarios (single link, dual link, carrier aggregation) through a unified framework. The same basic power control logic applies regardless of the number of access links, making the system versatile while maintaining manageable complexity.
Solution Approach 2:
The patent introduces dynamic selection of access links for power control purposes. The UE can dynamically choose which access link to use for DL pathloss measurement and power determination based on current channel conditions, beam availability, and traffic requirements. This dynamic adaptation enables support for multiple access links without requiring separate power control schemes for each scenario.
3Productivity
If higher sidelink transmission power is allowed in certain scenarios, then communication efficiency is improved, but interference management becomes more challenging
Solution Approach 1:
The patent applies local quality by allowing different sidelink transmission power levels in different spatial directions and different scenarios. Instead of a uniform power limit, the system determines power levels based on local conditions such as beam direction, target UE location, and channel characteristics. This enables higher power where needed for efficiency while maintaining lower power in directions where it would cause interference.
Solution Approach 2:
The patent incorporates feedback mechanisms where the gNB monitors sidelink transmissions and provides adjustments to UE power levels. The gNB can indicate which access link to use for power control and provide feedback on interference conditions, allowing the system to dynamically balance communication efficiency against interference management based on real-time network conditions.
Data Source
AI summary
Sidelink TX power control is disclosed. In a particular implementation, a method of wireless communication includes selecting, by a user equipment (UE), a first access link of multiple access links. Each of the multiple access links available for communication between the UE and a base station. The method also includes determining, by the UE, a sidelink transmission power based on the first access link. The method further includes transmitting, by the UE, data to an electronic device via a sidelink based on the sidelink transmission power.