PUSCH DCI Bit Alignment for Dynamic Transform Precoding Switch
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Solution Overview
Problem
Existing wireless communication systems lack flexibility and efficiency in dynamic waveform switching between CP-OFDM and DFT-s-OFDM, particularly in DCI formats for PUSCH, which affects the performance of user equipment and base stations.
Innovation Solution
Implementing a method for user equipment and base stations to adjust the bit alignment of DCI formats based on RRC parameters, enabling or disabling transform precoding for PUSCH, and ensuring consistent bit widths through bit padding or truncation to facilitate seamless switching between CP-OFDM and DFT-s-OFDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transform precoding is enabled for PUSCH transmission, then communication performance and spectral efficiency are improved, but processing complexity and computational requirements increase
Solution Approach 1:
The patent implements dynamic transform precoder selection where the transform precoder is enabled or disabled based on the target signal bandwidth. The system dynamically adjusts the processing mode (transform precoding or DFT-s-OFDM) according to the bandwidth threshold, allowing the device to adapt between complexity and performance requirements in real-time based on current transmission conditions.
2Productivity
If transform precoding is always applied, then spectral efficiency is improved, but flexibility in adapting to different transmission scenarios is reduced
Solution Approach 1:
The system dynamically switches between transform precoding and DFT-s-OFDM modes based on bandwidth conditions and reception mode requirements. This dynamic adaptation allows the system to maintain high spectral efficiency when conditions permit while preserving flexibility to adjust to different transmission scenarios, including coverage enhancement modes and various bandwidth configurations.
Solution Approach 2:
The patent changes the key parameter of transform precoder application based on bandwidth threshold comparisons. When the target signal bandwidth exceeds the threshold, transform precoding is applied to improve spectral efficiency; when it falls below, the system switches to DFT-s-OFDM mode. This parameter-based adaptation enables flexible response to different transmission requirements while maintaining optimal performance.
3Device complexity
If transform precoder is disabled, then processing complexity is reduced, but resource utilization efficiency deteriorates
Solution Approach 1:
The system dynamically determines whether to apply transform precoding based on real-time bandwidth assessment. Rather than permanently disabling the transform precoder to reduce complexity, the system selectively enables it when the bandwidth threshold is exceeded, thus maintaining low complexity for small bandwidths while capturing the resource utilization benefits of transform precoding when conditions allow.
Data Source
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AI summary
A user equipment, UE, is described. The UE may comprise high-layer processing circuitry configured to acquire at least a first RRC parameter for indicating that a first information field is present in a DCI format, the first information field indicating whether a transform precoder is enabled or disabled for a PUSCH. The UE may also comprise reception circuitry configured to monitor the DCI format with CRC scrambled by C-RNTI and the DCI format with CRC scrambled by CS-RNTI. A first number of bits may be included in a second information field in the DCI format with CRC scrambled by C-RNTI with the first information field indicating the transform precoder as disabled. If a second number of bits included in the second information field in the DCI format with CRC scrambled by CS-RNTI is not equal to the first number, most significant bit of which a value is "0" may be inserted to the second information field in the DCI format with CRC scrambled by CS-RNTI until the second number becomes equal to the first number.