5G NR Sidelink Parameter Selection Using UE Speed Thresholds
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Solution Overview
Problem
In 5G-NR sidelink communication, determining optimal transmission parameters such as transmission timing, radio resource selection, sidelink transmission output power, and modulation scheme is challenging due to the need for UE to estimate Doppler spread and relative speed with target receivers, which is difficult when the number of receivers is unknown.
Innovation Solution
A method for determining sidelink transmission parameters based on UE's absolute speed or relative speed with target receivers, using sets of parameters sent by a base station via RRC messages, and selecting appropriate parameters based on speed thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE estimates Doppler spread and relative speed with target receivers to determine optimal transmission parameters, then transmission efficiency is improved, but device complexity increases due to the difficulty of estimation when the number of receivers is unknown
Solution Approach 1:
The patent introduces an intermediary mechanism where the UE determines its absolute speed through available means (such as GPS or network assistance) and uses this absolute speed as a substitute for the difficult-to-obtain relative speed and Doppler spread estimates. This intermediary approach allows the UE to select appropriate transmission parameters without directly performing complex real-time Doppler and relative speed measurements with unknown receivers.
2Adaptability or versatility
If UE determines transmission parameters based on absolute speed or Doppler estimation, then adaptability to mobility scenarios is improved, but measurement precision deteriorates when the number of receivers is unknown
Solution Approach 1:
The patent changes the measurement parameter from direct relative speed and Doppler spread estimation (which require knowledge of target receivers) to absolute speed determination (which can be obtained independently). The network then provides multiple sets of transmission parameters corresponding to different absolute speed ranges, allowing the UE to adapt to various mobility scenarios using readily available absolute speed information rather than imprecise relative measurements.
Data Source
AI summary
A method, a User Equipment, a computer program and a computer readable medium for SideLink (SL) transmission parameter determination.