UE Doppler Pre-Compensation Signaling for Multi-TRP Uplink Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately compensating for variable Doppler shifts between user equipment (UE) and multiple transmission reception points (TRPs), leading to degraded communication reliability and efficiency, especially in scenarios with high-speed UE movement.
Innovation Solution
UEs provide capability indications to TRPs about their Doppler pre-compensation capabilities, allowing TRPs to configure appropriate compensation, and UEs estimate Doppler metrics to adjust transmission parameters, enhancing communication reliability and efficiency by reducing decoding errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Doppler pre-compensation is implemented in wireless communications, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements Doppler pre-compensation by estimating Doppler metrics and adjusting transmission parameters before communication occurs. The UE provides capability indications to TRPs about their Doppler pre-compensation capabilities, allowing TRPs to configure appropriate compensation parameters in advance, thereby improving communication reliability while managing device complexity through advance preparation
Solution Approach 2:
The patent changes transmission parameters based on estimated Doppler metrics. The UE estimates Doppler metrics such as Doppler shift and maximum Doppler spread, then adjusts transmission parameters accordingly. This dynamic parameter adjustment improves communication reliability in high-speed scenarios while maintaining manageable device complexity through algorithmic optimization
2Productivity
If Doppler metrics are estimated for multiple TRPs, then communication efficiency is improved, but measurement precision requirements increase
Solution Approach 1:
The patent segments the Doppler compensation process by allowing the UE to indicate support for multiple Doppler shifts corresponding to multiple TRPs. Each TRP's Doppler metrics can be estimated and compensated independently, enabling parallel processing that improves communication efficiency while managing measurement precision requirements through distributed estimation
Solution Approach 2:
The patent implements feedback mechanisms where the UE provides capability indications to TRPs about their Doppler pre-compensation capabilities. This feedback allows TRPs to configure appropriate compensation parameters based on actual UE capabilities and channel conditions, improving communication efficiency while adapting measurement precision requirements to actual system needs
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution improves communication reliability and efficiency by accurately compensating for Doppler shifts, reducing decoding errors and enhancing overall system performance, particularly in high-speed scenarios.
Implementation Method 1
A UE may provide a capability indication to a TRP that indicates whether the UE is capable of performing Doppler pre-compensation... The UE, when Doppler pre-compensation is supported and configured, may estimate one or more Doppler metrics (e.g., a Doppler shift, a maximum Doppler spread, or both) for one or multiple TRPs based on one or more reference signals from the TRPs
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which user equipment (UE) may provide a capability indication to one or multiple transmission reception points (TRPs) that indicates whether the UE is capable of performing Doppler pre-compensation. One or more of the TRPs may transmit configuration information to the UE to configure Doppler pre-compensation for subsequent communications. The UE may indicate that multiple Doppler shifts for a single communication with multiple TRPs is supported, or that a single Doppler shift or no Doppler shift is supported. The UE, when Doppler pre-compensation is supported and configured, may estimate one or more Doppler metrics (e.g., a Doppler shift, a maximum Doppler spread, or both) for one or multiple TRPs based on one or more reference signals from the TRPs, and may transmit one or more uplink communications based on the estimated Doppler metrics.