Air-to-Air Sidelink Precoding Using Geographic Beam Steering
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Solution Overview
Problem
Existing wireless communications systems fail to support efficient sidelink communications between user equipment (UEs), particularly in air-to-air scenarios, leading to inadequate coverage and high transmission power requirements.
Innovation Solution
Implementing precoding techniques for air-to-air sidelink communications based on geographic location information, allowing UEs to beamform messages towards specific directions and avoid interference by using precoding parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional omnidirectional transmission is used for sidelink communications, then coverage area is large, but transmission power requirement increases and interference increases
Solution Approach 1:
The patent applies local quality by transmitting signals with different characteristics in different spatial directions. Specifically, it uses location information of target UEs to determine directional transmission parameters, applying beamforming or precoding techniques to concentrate transmission energy toward specific directions where UEs are located, rather than uniformly in all directions. This resolves the contradiction by reducing overall transmission power while maintaining communication reliability through targeted directional transmission.
Solution Approach 2:
The patent introduces spatial dimensionality to the transmission by utilizing three-dimensional location information (azimuth and elevation angles) of target UEs. By mapping transmission parameters to spatial coordinates and using 3D beamforming, the system transforms traditional omnidirectional transmission into directional transmission across multiple spatial dimensions. This enables lower transmission power while maintaining reliable communication through precise spatial targeting.
2Productivity
If directional beamforming is implemented based on location information, then transmission efficiency improves, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having UEs report their location information (including azimuth and elevation angles) in advance before actual data transmission. The transmitting UE uses this pre-acquired location information to determine appropriate beamforming parameters and transmission directions. This resolves the contradiction by enabling efficient directional transmission without requiring complex real-time channel estimation or feedback mechanisms during the actual data transmission phase.
Solution Approach 2:
The patent implements self-service through autonomous determination of transmission parameters. Each UE independently determines its own transmission beamforming parameters based on received location information of target UEs, without requiring complex network coordination or centralized control. The UE autonomously selects precoding matrices and transmission directions, simplifying the overall system architecture while maintaining high transmission efficiency through directional beamforming.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive a message indicating geographic location information related to beamforming an air-to-air sidelink message via a sidelink channel. In some examples, a second UE may transmit the message or different as a message scheduling the sidelink message. The geographic directions to avoid when beamforming the sidelink message, or a combination thereof. The first UE may identify one or more precoding parameters based on the geographic location information. The first UE may transmit the air-to-air sidelink message to the second UE. The sidelink message may be precoded for transmission via a transmission beam using the one or more precoding parameters.