Semi-Persistent Uplink Waveform Switching for Power-Efficient 5G NR
Find Innovative SolutionsGenerate Solutions
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
A method and apparatus for semi-persistent waveform switching, where a UE or network node dynamically indicates a waveform configuration for uplink transmissions based on a dynamic indication, allowing the UE to switch to a specific waveform for a period of time, enabling efficient transform precoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic waveform switching between DFT-s-OFDM and CP-OFDM is implemented, then communication efficiency and power optimization are improved, but system complexity and implementation difficulty increase
Solution Approach 1:
The patent implements dynamic waveform switching between DFT-s-OFDM and CP-OFDM based on real-time channel conditions and traffic requirements. The system can adaptively change the waveform configuration for uplink transmissions, transforming a static system into a dynamic one that responds to varying operational conditions, thereby improving communication efficiency while managing complexity through controlled adaptability
Solution Approach 2:
The patent changes the waveform parameter (transform precoding enabled/disabled) based on operational conditions. By modifying this key parameter dynamically, the system optimizes power usage and adapts to different channel conditions without requiring complete system redesign, thus improving efficiency while keeping parameter changes manageable
2Use of energy by moving object
If transform precoding is enabled for waveform switching, then power usage is optimized, but implementation complexity increases
Solution Approach 1:
The patent enables transform precoding as a configurable parameter that can be switched on or off based on power optimization requirements. This parameter change allows the system to optimize power usage during uplink transmissions while maintaining implementation simplicity through a binary switchable state rather than continuous adjustment
Solution Approach 2:
The transform precoding mechanism serves multiple functions simultaneously: it optimizes power usage, adapts to different channel conditions, and maintains compatibility with existing OFDM infrastructure. This multi-functionality justifies the added implementation complexity by delivering multiple benefits from a single mechanism
3Adaptability or versatility
If semi-persistent waveform configuration is used, then switching flexibility is improved, but control signaling overhead increases
Solution Approach 1:
The patent employs semi-persistent waveform configuration where the waveform setting is established for a period of time rather than changed every transmission. This periodic approach provides switching flexibility for adapting to sustained channel conditions while reducing control signaling overhead by avoiding frequent reconfiguration commands
Solution Approach 2:
The semi-persistent configuration creates a dynamic balance between flexibility and overhead. The system can switch waveforms when conditions change significantly, providing adaptability, while maintaining stability during normal operation to minimize signaling overhead. This dynamic approach optimizes the trade-off between switching flexibility and control overhead
Data Source
AI summary
Method and apparatus for semi-persistent waveform switching for uplink transmissions. The apparatus receives an indication to switch to a first waveform configuration for uplink transmission over a period of time. The apparatus transmits the uplink transmission based on the first waveform configuration during the period of time. The apparatus switches to uplink communication based on the first waveform configuration after a time period following receipt of the indication. The time period comprises a processing time to switch to the first waveform configuration. The apparatus switches to the first waveform configuration for a current BWP in response to reception of the indication.