Waveform-Specific PHR Reporting for Dynamic PUSCH Switching
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Solution Overview
Problem
Existing Power Headroom Report (PHR) mechanisms do not support dynamic waveform switching in 5G New Radio (NR) networks, limiting the gNB's ability to efficiently select between DFT-s-OFDM and CP-OFDM waveforms based on current PHR metrics.
Innovation Solution
Introduce waveform-specific PHR reporting methods that allow UEs to calculate and transmit separate PHRs for DFT-s-OFDM and CP-OFDM, enhancing PHR triggering events and accounting for path loss variations with different reference signals, enabling dynamic waveform selection by the gNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single PHR mechanism is used for both DFT-s-OFDM and CP-OFDM waveforms, then the system complexity is reduced, but the gNB cannot efficiently select the optimal waveform based on accurate power headroom information for each waveform type
Solution Approach 1:
The patent segments the PHR mechanism into waveform-specific components by introducing separate PHR fields for DFT-s-OFDM and CP-OFDM waveforms. The MAC CE structure is divided to include distinct power headroom information for each waveform type, allowing the gNB to evaluate and select the optimal waveform based on accurate power headroom metrics for each specific waveform rather than using a single aggregated PHR value.
2Measurement precision
If separate PHRs are calculated and reported for each waveform type, then the waveform selection accuracy is improved, but the reporting overhead and processing complexity increase
Solution Approach 1:
The patent merges multiple waveform-specific PHR reports into a single MAC CE structure. Instead of requiring separate reporting procedures for DFT-s-OFDM and CP-OFDM PHRs, the invention combines them into one unified MAC CE that contains multiple PHR fields, each associated with a specific waveform type. This reduces the number of separate signaling transactions and simplifies the reporting process while maintaining accurate waveform-specific power headroom information.
3Productivity
If dynamic waveform switching is enabled, then the power amplifier efficiency and coverage are improved, but the existing PHR mechanism cannot provide sufficient information for optimal waveform switching decisions
Solution Approach 1:
The patent implements a feedback mechanism where the UE calculates and reports separate power headroom values for both DFT-s-OFDM and CP-OFDM waveforms. This provides the gNB with comprehensive feedback information about the available power margin for each waveform type, enabling informed waveform switching decisions. The gNB can use this feedback to select the waveform that maximizes power amplifier efficiency while maintaining reliable communication, particularly at cell edges where waveform selection critically impacts coverage.
Data Source
AI summary
Methods and apparatus of reporting PHR for supporting dynamic waveform switching are disclosed. The apparatus includes a receiver that receives Downlink Control Information (DCI) in an active serving cell indicating a first waveform or a second waveform for a Physical Uplink Shared Channel (PUSCH) transmission; a processor that determines a first Power Headroom Report (PHR) corresponding to the first waveform, and a second PHR corresponding to the second waveform; and a transmitter that transmits the first PHR and/or the second PHR for the active serving cell.