Dynamic MCS Table Switching for Waveform Coordination
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Solution Overview
Problem
Current wireless communication systems face challenges in dynamically switching between modulation and coding scheme (MCS) tables, leading to link interruptions and inefficiencies, particularly for UEs at the cell edge, due to the lack of synchronous switching between CP-OFDM and DFT-s-OFDM waveforms.
Innovation Solution
Implementing a dynamic indication mechanism for UEs and base stations to switch between MCS tables, allowing for synchronous switching of waveform types and spectral efficiencies based on real-time channel conditions, using a dynamic indication method that aligns both the base station and UE on switching times with minimal latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic switching between MCS tables is implemented without synchronous coordination, then adaptability to channel conditions is improved, but link reliability deteriorates due to link interruptions
Solution Approach 1:
The base station sends a dynamic indication to switch MCS tables before the actual switching occurs at a predetermined time. This preliminary signaling ensures both the base station and UE are synchronized and prepared for the switch, preventing link interruptions while maintaining adaptability to changing channel conditions.
Solution Approach 2:
The system uses uplink feedback channels to confirm receipt of dynamic indication and to report channel conditions. This feedback mechanism ensures that both the base station and UE have consistent information about the current operating state, enabling reliable synchronous switching between MCS tables and waveform types.
2Device complexity
If MCS table switching is performed without dynamic indication, then device complexity is reduced, but spectral efficiency deteriorates due to inability to adapt to real-time channel conditions
Solution Approach 1:
The dynamic indication mechanism serves multiple functions: it signals MCS table switching, coordinates waveform type changes (CP-OFDM to DFT-s-OFDM), and triggers spectral efficiency adjustments. This multi-functional approach enables real-time adaptation to channel conditions without requiring separate control mechanisms for each parameter, maintaining manageable device complexity while maximizing spectral efficiency.
3Reliability
If synchronous switching between waveform types is implemented, then link reliability is improved, but device complexity increases due to coordination requirements
Solution Approach 1:
The patent combines MCS table switching, waveform type switching, and spectral efficiency adjustments into a single dynamic indication mechanism. By merging these control functions into one coordinated process triggered by a single indication, the system achieves synchronous switching that improves link reliability while avoiding the complexity of multiple separate control mechanisms.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a dynamic indication to switch from a modulation and coding scheme (MCS) table to a new MCS table. The UE may transmit, to the base station, one or more uplink communications that use a transmit waveform type associated with the new MCS table. Numerous other aspects are provided.