Semi-Persistent Uplink Waveform Switching for Lower PAPR
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, lack efficient mechanisms for dynamically switching between DFT-s-OFDM and CP-OFDM waveforms for uplink transmissions, leading to suboptimal performance due to varying power requirements and implementation complexities.
Innovation Solution
Implementing a configuration that allows for semi-persistent waveform switching based on dynamic indications from a network entity, enabling UEs to switch to a specific waveform configuration for uplink transmissions over a defined period, thereby optimizing power efficiency and implementation simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If waveform switching is implemented dynamically for uplink transmissions, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic waveform switching between DFT-s-OFDM and CP-OFDM based on real-time network conditions and UE power state. The network entity sends waveform indication messages to switch between waveforms, enabling the system to adapt dynamically rather than using a fixed waveform configuration, thus improving power efficiency while managing complexity through controlled adaptability
Solution Approach 2:
The patent changes the waveform parameter (transform precoding enablement) based on transmission conditions. By switching the transform precoding parameter between enabled and disabled states, the system optimizes power consumption for different uplink transmission scenarios while maintaining manageable device complexity through parameter-based control
2Power
If transform precoding is enabled for uplink transmissions, then peak-to-average power ratio is reduced, but implementation complexity increases
Solution Approach 1:
The patent dynamically enables or disables transform precoding based on current transmission requirements. The network entity controls when transform precoding should be applied by sending waveform indication messages, allowing the system to reduce PAPR only when beneficial while avoiding unnecessary complexity in other transmission scenarios
Solution Approach 2:
The patent modifies the transform precoding parameter state (enabled/disabled) based on transmission conditions. By changing this parameter selectively rather than always enabling it, the system achieves PAPR reduction when needed while keeping implementation complexity manageable by avoiding unnecessary processing in other cases
Data Source
AI summary
Method and apparatus for semi-persistent waveform switching for uplink transmissions. The apparatus outputs a semi-static waveform configuration indicating a semi-statically indicated waveform. The apparatus outputs, after the output of the semi-static waveform configuration, an indication for a user equipment (UE) to switch to a first waveform configuration for uplink transmission during a time window of validity. The apparatus obtains the uplink transmission based on the first waveform configuration during the time window of validity. The apparatus switches, based on an expiration of the time window of validity, from obtaining the uplink transmission based on the first waveform configuration to obtaining the uplink transmission based on the semi-statically indicated waveform.