PUSCH Precoding Granularity Switching Based on MCS
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Solution Overview
Problem
In current communication systems, the precoding frequency domain granularity for uplink transmission is limited to wideband, leading to a lower signal-to-interference-plus-noise ratio (SINR) and reduced transmission rate for physical uplink shared channels (PUSCH) due to suboptimal channel estimation performance.
Innovation Solution
A method to dynamically determine the precoding frequency domain granularity of PUSCH based on the modulation and coding scheme (MCS), adjusting between wideband and subband precoding to enhance channel estimation accuracy and SINR, by using different precoding matrices for contiguous or non-contiguous resource blocks based on MCS thresholds and resource block continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wideband precoding is used for uplink transmission, then device complexity is reduced, but signal-to-interference-plus-noise ratio (SINR) and transmission rate deteriorate
Solution Approach 1:
The patent applies dynamics by making the precoding frequency domain granularity adjustable rather than fixed. The terminal device dynamically determines the granularity based on the MCS value - using wideband precoding for low-order MCS and subband precoding for high-order MCS. This dynamic adaptation resolves the contradiction by selecting the appropriate precoding mode according to channel conditions, thereby improving transmission rate without permanently increasing device complexity.
Solution Approach 2:
The patent changes the parameter of precoding frequency domain granularity from a fixed wideband setting to a variable parameter that depends on MCS. By changing this parameter based on the modulation and coding scheme, the system can optimize between complexity and transmission rate performance, resolving the technical contradiction through parameter adaptation.
2Productivity
If subband precoding is used, then signal-to-interference-plus-noise ratio (SINR) improves, but channel estimation performance deteriorates
Solution Approach 1:
The patent uses parameter changes by adjusting the precoding frequency domain granularity based on MCS thresholds. For low-order MCS, it selects wideband precoding to maintain good channel estimation accuracy. For high-order MCS, it selects subband precoding to improve SINR. This parameter adaptation resolves the contradiction by choosing the appropriate precoding mode according to the specific channel conditions and MCS requirements.
Solution Approach 2:
The patent applies dynamics by making the precoding mode selectable based on real-time channel conditions indicated by MCS. The system dynamically switches between wideband and subband precoding modes, allowing it to optimize between channel estimation accuracy and SINR performance depending on the current transmission requirements.
3Ease of manufacture
If fixed wideband precoding is used, then implementation simplicity increases, but transmission rate is reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed wideband precoding implementation to a dynamic system that adapts the precoding frequency domain granularity based on MCS. This dynamic approach maintains implementation simplicity through clear threshold-based decision logic while significantly improving transmission rate by selecting the optimal precoding mode according to channel conditions.
Solution Approach 2:
The patent changes the implementation from a static fixed parameter system to a dynamic parameter selection system. By changing the precoding frequency domain granularity parameter based on MCS thresholds, the system maintains ease of implementation through straightforward threshold comparison while achieving higher transmission rates through adaptive precoding mode selection.
Data Source
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AI summary
Embodiments of this application disclose a precoding method and an apparatus for physical uplink shared channel transmission. The method includes: receiving a modulation and coding scheme MCS of a physical uplink shared channel PUSCH; and determining a precoding frequency domain granularity of the PUSCH based on the MCS. The method can increase a signal to interference plus noise ratio of a PUSCH received by a network device, thereby increasing a transmission rate.