Non-Coherent Waveform Transmission for Wireless Energy Efficiency
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in downlink resource monitoring, leading to unnecessary energy consumption when UE is not in active communication sessions, and potential delays in BS-UE communication when monitoring is discontinued.
Innovation Solution
Implementing methods for UE to monitor non-coherent downlink waveforms during discontinuous reception phases, receive and decode data without channel state information, and transition to coherent communication when necessary, allowing for reduced power usage and timely data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors the downlink resource, then the communication reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) where the UE alternates between active monitoring periods and sleep periods. During active periods, the UE monitors downlink resources; during sleep periods, the UE conserves energy by not monitoring. This periodic action resolves the contradiction by providing reliable communication during active periods while reducing energy consumption during sleep periods.
Solution Approach 2:
The patent uses non-coherent waveform transmission that allows the UE to decode data without requiring channel state information (CSI) to be fully established first. The base station transmits data in a manner that is robust to channel variations, enabling the UE to successfully receive and decode data even during transition periods or when CSI is not yet available, thus maintaining communication reliability while allowing the UE to operate in low-power modes.
2Use of energy by moving object
If the UE discontinues monitoring to save energy, then the energy consumption is reduced, but the communication latency increases
Solution Approach 1:
The DRX mechanism creates periodic wake-up intervals where the UE monitors for downlink data. By carefully configuring the DRX cycle length and on-duration parameters, the system balances energy savings during sleep periods with timely detection of downlink data during active periods, thus managing both energy consumption and latency requirements.
Solution Approach 2:
The patent introduces downlink control information (DCI) as an intermediary mechanism. The base station sends DCI messages that can wake up the UE from sleep mode when data is available. This intermediary allows the UE to remain in low-power state most of the time while still being able to respond quickly when actual data transmission is needed, thus reducing both energy consumption and latency.
3Measurement precision
If the UE requires channel state information for decoding, then the decoding accuracy is improved, but the system complexity increases
Solution Approach 1:
The patent employs non-coherent waveform transmission where the base station transmits data with built-in redundancy and robust modulation schemes that do not require precise channel state information for decoding. This approach sacrifices some decoding optimization for significantly reduced system complexity, allowing the UE to decode data using simpler algorithms that don't require maintaining and processing CSI, thus resolving the contradiction between decoding accuracy and system complexity.
Solution Approach 2:
The patent changes the transmission parameter from coherent to non-coherent waveform modulation. Non-coherent modulation schemes are inherently more robust to channel variations and do not require accurate channel state information for successful decoding. This parameter change allows the system to achieve acceptable decoding accuracy with significantly reduced complexity in channel estimation and CSI management.
Data Source
AI summary
Aspects of the present disclosure include methods, apparatuses, and computer readable media for monitoring a non-coherent downlink waveform during a discontinuous reception phase, receiving downlink data on the non-coherent downlink waveform, and decoding the downlink data without channel state information of the non-coherent downlink waveform.