Dynamic Waveform Selection for Wireless Uplink Control
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Solution Overview
Problem
The existing configuration manner for mobile communications systems is increasingly inflexible, affecting user experience due to the inability to dynamically adjust waveforms based on changing channel conditions.
Innovation Solution
A control information sending method and apparatus that allows a network device to configure an appropriate waveform for a terminal, enabling flexible waveform selection based on channel conditions, either for single-time or multiple-time uplink data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If DFT-S-OFDM technology is used in uplink, then PAPR is reduced, but waveform flexibility is limited due to single-carrier constraint
Solution Approach 1:
The patent enables dynamic waveform switching between DFT-S-OFDM and OFDM based on channel conditions and service requirements. The network device can flexibly select and configure different waveforms for uplink transmission, transitioning from a fixed single-carrier constraint to a dynamic multi-waveform system that adapts to varying operational needs.
Solution Approach 2:
The patent changes the key parameter of waveform type from a fixed state to a variable state. By introducing waveform indication information that can specify different waveform types (DFT-S-OFDM or OFDM), the system allows parameter changes in the transmission characteristics based on channel quality, service type, and other operational factors.
2Device complexity
If fixed DFT-S-OFDM waveform configuration is used, then implementation is simplified, but user experience deteriorates due to inability to adapt to changing channel conditions
Solution Approach 1:
The patent introduces dynamic waveform adaptation where the network device can adjust the waveform type based on real-time channel conditions and service requirements. This dynamic configuration maintains implementation simplicity through automated network-side control while dramatically improving user experience by adapting to changing operational conditions.
Solution Approach 2:
The system implements feedback mechanisms where the network device monitors channel conditions and service requirements, then adjusts waveform configuration accordingly. This feedback loop enables the system to maintain simple implementation at the terminal while achieving adaptive optimization of transmission performance based on actual operating conditions.
3Adaptability or versatility
If waveform configuration is sent frequently to adapt to channel changes, then adaptability is improved, but communication overhead increases
Solution Approach 1:
The patent integrates waveform indication information into existing downlink control information (DCI) structures, allowing the same control channel to serve multiple functions: scheduling resource allocation and indicating waveform type. This multi-functionality approach enables waveform adaptability without requiring separate dedicated signaling channels, thus avoiding significant increases in communication overhead.
Solution Approach 2:
The patent merges waveform indication with scheduling information in the downlink control information. By combining multiple control functions (resource scheduling and waveform selection) into a single signaling message, the system achieves waveform adaptability while minimizing the increase in communication overhead through efficient signal consolidation.
Data Source
AI summary
The present disclosure relates to control information sending methods in a wireless communications system. In one example waveform control information sending method, a network device obtains control information that includes uplink transmission waveform indication information, and sends the control information to a terminal. After receiving the control information, the terminal determines, based on the control information, a waveform used to send uplink data.