Dynamic Waveform Selection for RACH and Autonomous Uplink
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Solution Overview
Problem
Wireless communication networks face interference and reduced performance due to increasing demand for mobile broadband access, leading to congested networks and degraded signal quality, particularly in scenarios where user equipment (UE) lacks sufficient channel information for waveform configuration.
Innovation Solution
User equipment (UE) is enabled to select between Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) and Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) waveforms for RACH procedures and autonomous uplink transmissions, based on measured path loss and preconfiguration, to optimize waveform selection and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If UEs use a fixed waveform configuration for uplink transmissions, then device complexity is reduced, but adaptability to different channel conditions deteriorates
Solution Approach 1:
The patent implements dynamic waveform selection where UEs can switch between DFT-S-OFDM and CP-OFDM waveforms based on measured path loss and channel conditions. The UE determines which waveform to use for RACH procedures and autonomous UL transmissions by comparing measured path loss against thresholds, enabling adaptive behavior rather than fixed configuration.
Solution Approach 2:
The patent changes the waveform parameter based on channel conditions. Specifically, it modifies the waveform type (DFT-S-OFDM vs CP-OFDM) according to path loss measurements and network configuration, allowing the system to optimize performance by selecting appropriate waveform parameters for different transmission scenarios.
2Productivity
If UEs select waveforms dynamically based on channel conditions, then communication efficiency is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary waveform selection before actual data transmission. The UE measures path loss and determines the appropriate waveform in advance for RACH procedures and autonomous UL transmissions, ensuring optimal communication efficiency is achieved before data transfer begins rather than during transmission.
Solution Approach 2:
The patent enables UEs to autonomously select waveforms based on their own path loss measurements and preconfigured thresholds without requiring complex network coordination. The UE independently determines which waveform to use for uplink transmissions, reducing overall system complexity while maintaining adaptability.
3Use of energy by moving object
If DFT-S-OFDM waveform is used for power-limited users, then power efficiency is improved, but interference management capability deteriorates
Solution Approach 1:
The patent changes the waveform parameter based on channel conditions and power requirements. For power-limited users, it selects DFT-S-OFDM to maximize power amplifier efficiency, while for users with better channel conditions or higher power availability, it selects CP-OFDM for improved interference management and spectral efficiency.
Data Source
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AI summary
Systems and methods herein determine whether an uplink RACH request and/or an uplink autonomous message will be sent using Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM), Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM), or another waveform. Other aspects, embodiments, and features are also claimed and described.