Control Signaling Waveform Switching for High-Frequency Cell Coverage
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Solution Overview
Problem
Existing wireless communication systems face performance degradation at high frequencies due to high path loss and nonlinear transfer characteristics of RF components, leading to issues with CP-OFDM degradation, limited cell coverage, and reduced MIMO capabilities, which are not adequately addressed by current single carrier waveforms.
Innovation Solution
Implementing multiple waveform configurations and switching mechanisms for control signaling, including associating different waveform types with distinct control signaling configurations, to enhance cell coverage and flexibility in downlink and uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CP-OFDM waveform is used for downlink and uplink transmissions, then system performance is maintained at lower frequencies, but performance degrades at high frequencies (52.6 GHz and above) due to high path loss and nonlinear RF characteristics
Solution Approach 1:
The patent implements dynamic waveform switching between CP-OFDM and DFT-s-OFDM based on frequency conditions. When operating above 52.6 GHz, the system automatically switches to DFT-s-OFDM waveform which exhibits better robustness against high path loss and nonlinear RF characteristics, thereby maintaining system performance in millimeter wave bands
Solution Approach 2:
The patent changes the waveform parameter based on frequency thresholds. By monitoring the operating frequency and switching the waveform type accordingly, the system adapts to different propagation conditions - using CP-OFDM for lower frequencies and DFT-s-OFDM for high frequencies above 52.6 GHz
2Reliability
If single carrier waveform is used to address high frequency issues, then path loss and nonlinear effects are mitigated, but cell coverage is limited and MIMO capabilities are reduced
Solution Approach 1:
The patent dynamically switches between single carrier (DFT-s-OFDM) and multi-carrier (CP-OFDM) waveforms based on operational requirements. When robustness against path loss is prioritized, DFT-s-OFDM is used; when cell coverage and MIMO capabilities are needed, CP-OFDM is selected, allowing the system to optimize between these conflicting requirements
3Adaptability or versatility
If multiple waveform types are associated with different control signaling configurations, then cell coverage and flexibility are enhanced, but device complexity increases
Solution Approach 1:
The patent segments the control signaling configuration into multiple distinct waveform type configurations. Each waveform type (CP-OFDM and DFT-s-OFDM) has its own dedicated configuration parameters, allowing independent optimization without interference. This segmentation simplifies management by providing clear, separate configuration paths for each waveform type
Solution Approach 2:
The patent creates a universal control signaling framework that can accommodate multiple waveform types through a unified configuration mechanism. The same control signaling structure can indicate different waveform types based on frequency conditions, making the system adaptable without requiring entirely separate configuration systems for each waveform
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for associating a control signaling configuration with a waveform type. One apparatus in a mobile communication network includes a processor and a transceiver that receives a configuration for control signaling. The processor associates a control signaling configuration with a waveform type, where at least two different waveform types are associated with different control signaling configurations. The transceiver receives from a radio access network a control signal transmission using the associated waveform type.