Mixed-Waveform MCS Table Configuration via RRC Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring mixed-waveform modulation and coding scheme (MCS) tables, leading to inefficient resource allocation and dynamic waveform switching capabilities in user equipment (UE).
Innovation Solution
The described techniques involve a network entity, such as a base station, indicating to a UE to select a mixed-waveform MCS table for transmitting or receiving scheduled data. This is achieved through control signaling, including radio resource control (RRC) signaling and downlink control information (DCI) messages, which specify the use of multiple waveforms like DFT-s-OFDM and CP-OFDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single waveform MCS table is used, then the configuration is simple, but the system cannot support dynamic waveform switching between different waveforms (e.g., DFT-s-OFDM and CP-OFDM)
Solution Approach 1:
The patent segments the MCS table configuration by creating separate MCS tables for different waveforms (DFT-s-OFDM and CP-OFDM). Each waveform has its own dedicated MCS table with appropriate modulation and coding schemes optimized for that waveform's characteristics. This segmentation allows the system to support multiple waveforms without creating a single overly complex unified table, as each waveform's specific requirements are addressed in its own table structure.
Solution Approach 2:
The patent implements a universal MCS table selection mechanism that can dynamically choose between different waveform-specific MCS tables based on the scheduled waveform type. The system maintains multiple MCS tables (one for each waveform type) and selects the appropriate table through control signaling, enabling the system to handle multiple waveform types with a unified selection framework rather than requiring separate configuration procedures for each waveform.
2Adaptability or versatility
If separate MCS tables are configured for each waveform, then dynamic waveform switching is supported, but the control signaling overhead increases
Solution Approach 1:
The patent merges the waveform indication and MCS table selection into a single control signaling operation. When the network entity schedules data with a specific waveform, it simultaneously indicates which MCS table to use based on the waveform type. This merging eliminates the need for separate waveform indication signaling and separate MCS table selection signaling, reducing the overall control overhead while still supporting dynamic waveform switching between DFT-s-OFDM and CP-OFDM.
3Reliability
If waveform-specific MCS tables are used, then communication reliability for each waveform is optimized, but the device complexity increases
Solution Approach 1:
The patent performs preliminary configuration of waveform-specific MCS tables in advance, so that when data transmission occurs, the UE already has the appropriate MCS table ready for the scheduled waveform. The network entity configures multiple MCS tables (for DFT-s-OFDM and CP-OFDM) beforehand, and during scheduling, simply indicates which pre-configured table to use. This preliminary action eliminates the need for real-time MCS table generation or complex runtime decisions, reducing UE processing complexity while maintaining optimized reliability for each waveform.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control signaling from a network entity, such as radio resource control (RRC) signaling, indicating for the UE to select a mixed-waveform modulation and coding scheme (MCS) table. The UE may select the MCS table in accordance with the signaling. The network entity may send additional control signaling to the UE indicating for the UE to use one or more of the waveforms in the mixed-waveform MCS table for scheduled data. For example, the UE may transmit the scheduled data, receive the scheduled data, or both in accordance with the one or more waveforms indicated in the additional control signaling.