Wake-Up Signal Subcarrier Mapping for Adaptive Numerology
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Solution Overview
Problem
The adaptive OFDM numerology in wireless communication systems affects the bandwidth occupancy of wake-up signals (WUS), leading to increased hardware complexity and power consumption in UE receivers, as they need to adapt to varying subcarrier spacings, making it difficult to implement low-power and low-complexity wake-up mechanisms.
Innovation Solution
The method involves determining a flexible mapping of WUS to subcarriers based on the current setting of OFDM numerology, particularly subcarrier spacing, to maintain a constant or nearly constant bandwidth, thereby reducing the need for dynamic bandwidth adjustments and simplifying receiver design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adaptive OFDM numerology is used to support different service types and deployment frequency ranges, then system flexibility and adaptability are improved, but wake-up signal bandwidth occupancy varies leading to increased receiver hardware complexity and power consumption
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the number of subcarriers used for WUS transmission based on the current OFDM numerology setting. When numerology changes (e.g., different subcarrier spacings), the system recalculates and reconfigures the WUS bandwidth parameters to maintain optimal performance while adapting to the new numerology configuration.
Solution Approach 2:
The patent implements dynamics by making the WUS bandwidth configurable and adaptable rather than fixed. The receiver can dynamically adjust its bandwidth settings to match the current numerology, and the system provides mechanisms for both network-controlled and UE-autonomous adaptation to varying numerology conditions.
2Productivity
If adaptive OFDM numerology is used to optimize for different service types, then service optimization is improved, but wake-up signal transmission becomes more complex requiring dynamic bandwidth adjustments
Solution Approach 1:
The system changes the WUS transmission parameters (bandwidth, subcarrier allocation) according to the active numerology configuration. This ensures that WUS transmission remains optimized for the current service type while automatically adapting to numerology changes without requiring manual reconfiguration.
Solution Approach 2:
The patent incorporates feedback mechanisms where the network can signal the current numerology configuration to the UE, enabling the UE to automatically adjust its WUS reception parameters. This feedback loop maintains ease of operation by eliminating the need for UE-initiated numerology detection or manual configuration.
3Device complexity
If fixed bandwidth is used for wake-up signal transmission, then receiver design is simplified, but the system cannot adapt to varying OFDM numerology settings
Solution Approach 1:
The patent transitions from a fixed bandwidth approach to a dynamic bandwidth approach where the WUS bandwidth is configured based on the current numerology. The receiver can operate in modes that support both fixed bandwidth (for simplicity) and dynamic bandwidth (for adaptability), with the ability to switch between these modes as needed.
Solution Approach 2:
The patent segments the bandwidth configuration into discrete options or modes that can be selected based on the numerology setting. Rather than requiring continuous adaptation, the system uses predefined bandwidth segments or configurations that correspond to different numerology types, simplifying the adaptation process while maintaining versatility.
Data Source
AI summary
Wake-up Signals and Adaptive Numerology A count of one or more subcarriers of a carrier is determined depending on a setting of an adaptive modulation numerology of the carrier. A wake-up signal is transmitted to a wireless communication device on the one or more subcarriers.