Uplink Power Headroom Feedback for Dynamic Waveform Switching
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Solution Overview
Problem
Existing mobile communication systems face challenges in dynamically switching transmission waveforms and controlling uplink transmission power in scenarios involving carrier aggregation and dual connectivity, particularly at the cell edge where instantaneous fluctuations in channel or interference environments occur, leading to inefficiencies in power utilization and coverage.
Innovation Solution
A method for determining and feeding back information on power headroom in the uplink, considering both the currently configured and candidate transmission waveforms across multiple frequency bands, enabling dynamic waveform switching and appropriate uplink scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission waveform is dynamically switched in uplink for carrier aggregation, then communication performance and adaptability to interference environments are improved, but power utilization efficiency deteriorates due to instantaneous fluctuations in channel conditions
Solution Approach 1:
The patent implements dynamic transmission waveform switching between DFT-s-OFDM and CP-OFDM based on real-time channel conditions and interference environments. The terminal determines power headroom information considering both currently configured and candidate transmission waveforms, enabling adaptive selection that optimizes both communication performance and power utilization efficiency in carrier aggregation scenarios
Solution Approach 2:
The patent changes the transmission waveform parameters dynamically by selecting between different waveform types (DFT-s-OFDM and CP-OFDM) based on channel conditions. The power headroom information is calculated considering multiple waveform candidates, allowing the system to adjust transmission parameters adaptively to maintain power efficiency while improving communication performance
2Measurement precision
If power headroom information is determined based on both currently configured and candidate transmission waveforms, then uplink scheduling accuracy is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary calculation of power headroom information by considering both currently configured and candidate transmission waveforms before actual transmission. This advance preparation enables accurate uplink scheduling decisions while the base station receives pre-computed power headroom data, reducing real-time processing complexity
Solution Approach 2:
The patent introduces power headroom information as an intermediary parameter that mediates between the terminal's transmission capabilities and the base station's scheduling decisions. By calculating and reporting this intermediate metric considering multiple waveform candidates, the system achieves accurate scheduling without requiring the base station to perform complex real-time waveform evaluations
Data Source
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AI summary
In the present invention, a signal is appropriately transmitted in an uplink. A terminal according to the present invention is provided with: a control circuit that, in communication in which a plurality of frequency bands are used, determines information related to surplus power of an uplink in a first frequency band of the plurality of frequency bands, on the basis of a transmission waveform of the first frequency band and a transmission waveform of a second frequency band different from the first frequency band of the plurality of frequency bands; and a transmission circuit that transmits the information related to the surplus power.