Adaptive Downlink Waveform and Guard Interval for 5G Above 52.6 GHz
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Solution Overview
Problem
Next-generation wireless communication systems, such as 5G NR, face challenges in adapting waveform types and guard interval lengths for efficient data transmission above 52.6GHz carrier frequencies, particularly in handling phase noise and power amplifier efficiency, while supporting diverse services like eMBB, mMTC, and URLLC.
Innovation Solution
The system employs mechanisms for waveform type adaptation between CP-OFDM and single carrier waveforms, such as DFT-s-OFDM and SC-FDE, and adjusts guard interval lengths based on channel conditions to optimize data transmission, with default waveforms for synchronization signals and common control messages, and UE-specific configuration for improved coverage and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CP-OFDM waveform is used for downlink transmission, then spectrum efficiency is improved, but power amplifier efficiency deteriorates due to high PAPR
Solution Approach 1:
The system dynamically adapts between CP-OFDM and single carrier waveforms based on channel conditions and service requirements. The gNB selects the appropriate waveform type and notifies the UE, allowing the system to switch from CP-OFDM (high spectrum efficiency) to single carrier (low PAPR) when needed, resolving the contradiction between spectrum efficiency and power amplifier efficiency.
Solution Approach 2:
The patent changes the waveform type parameter from fixed CP-OFDM to adaptive selection between CP-OFDM and single carrier waveforms. This parameter change allows optimization of both spectrum efficiency and power amplifier efficiency by selecting the appropriate waveform based on current system conditions.
2Reliability
If guard interval length is increased to handle phase noise, then reliability is improved, but data rate deteriorates due to reduced transmission time
Solution Approach 1:
The system dynamically adapts guard interval length based on channel conditions and phase noise characteristics. The gNB selects appropriate guard interval lengths and notifies the UE, allowing the system to increase guard intervals when phase noise is severe (improving reliability) while using shorter guard intervals when conditions permit (maintaining data rate).
Solution Approach 2:
The patent changes the guard interval length parameter from fixed to adaptive, allowing optimization of the balance between reliability (phase noise handling) and productivity (data rate) based on current channel conditions.
3Adaptability or versatility
If waveform type is adapted for different services, then adaptability is improved, but device complexity increases due to multiple waveform support
Solution Approach 1:
The system dynamically selects waveform types based on service requirements and channel conditions, with the gNB making the selection and notifying the UE. This dynamic approach provides service-specific optimization (eMBB, mMTC, URLLC) while centralizing the complexity in the gNB, reducing UE processing complexity.
Solution Approach 2:
The patent segments the waveform adaptation functionality, with the gNB responsible for selection and notification, and the UE responsible for execution based on received indications. This segmentation distributes complexity appropriately, improving adaptability while managing device complexity.
Data Source
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AI summary
Technology for a Next Generation NodeB (gNB) operable to adapt to a downlink waveform type for wireless transmissions is disclosed. The gNB can encode an indicator of a downlink waveform type of a plurality of downlink waveform types for transmission to a user equipment (UE). The gNB can encode 5 a downlink signal for transmission on a downlink physical channel to the UE using the indicated downlink waveform type in a wireless system operating above a 52.6 gigahertz (GHz) carrier frequency.