PUSCH DCI Field Sizing for Dynamic Waveform Switching
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Solution Overview
Problem
The challenge in wireless communication systems is determining DCI fields for dynamic waveform switching between DFT-s-OFDM and CP-OFDM waveforms in PUSCH transmissions, as existing methods do not account for varying configurations and bit widths based on different waveforms.
Innovation Solution
A method and apparatus for a UE to determine DCI field bit widths based on maximum bit widths derived from RRC configurations for both DFT-s-OFDM and CP-OFDM waveforms, ensuring correct interpretation and switching between these waveforms, including specific field bit width determination for FDRA, frequency hopping, SRS, and other parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic waveform switching is supported in DCI, then waveform flexibility and adaptability are improved, but DCI field bit width determination becomes complex and ambiguous
Solution Approach 1:
The patent changes the parameter of DCI field bit width from being waveform-specific to being determined by maximum bit width across all supported waveforms. This allows the same DCI structure to accommodate both DFT-s-OFDM and CP-OFDM waveforms by using the maximum bit width required by any waveform, thereby resolving the complexity of determining different bit widths for different waveforms while maintaining waveform flexibility
Solution Approach 2:
The patent makes the DCI field bit width universal across different waveforms by defining it as the maximum bit width among all supported waveforms. This single bit width value serves multiple waveform types (DFT-s-OFDM and CP-OFDM), eliminating the need for separate bit width determination procedures for each waveform and simplifying the overall system complexity
2Manufacturing precision
If separate RRC configurations are used for different waveforms, then waveform-specific optimization is improved, but DCI interpretation consistency deteriorates
Solution Approach 1:
The patent performs preliminary determination of the maximum bit width based on all supported waveforms before DCI transmission. This pre-established bit width value is then used consistently for interpreting DCI fields regardless of which waveform is actually used, ensuring interpretation consistency while still allowing waveform-specific RRC configurations to optimize each waveform's performance
Solution Approach 2:
The patent maintains waveform-specific RRC configurations for local optimization of each waveform's parameters, while the DCI field bit width is determined globally as the maximum across all waveforms. This allows each waveform to have optimized configurations locally while maintaining global consistency in DCI interpretation
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for determining downlink control information (DCI) fields. According to an embodiment of the present disclosure, a user equipment (UE) can include: a receiver configured to: receive DCI scheduling or activating a physical uplink shared channel (PUSCH) transmission, wherein the DCI also indicates a waveform of the PUSCH transmission scheduled or activated by the DCI; a processor coupled to the receiver and configured to: determine a bit width for each field of one or more fields in the DCI; and a transmitter coupled to the processor and configured to transmit the PUSCH transmission based on the DCI.