PUSCH Transform Precoder Signaling for Clear DCI Interpretation
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Solution Overview
Problem
Existing mobile communication systems face challenges in interpreting transform precoder indicator fields in DCI formats due to differing bit widths for dynamic grant and configured-grant PUSCH, leading to ambiguity and unnecessary waveform switching, which affects latency and resource efficiency.
Innovation Solution
A method to interpret the transform precoder indicator field based on uplink scheduling methods, using a 1-bit field for dynamic grant and configured grant PUSCH, with specific rules for CRC scrambled by different RNTIs, ensuring clear interpretation and limiting unnecessary waveform switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transform precoder indicator field is present in DCI format for both dynamic grant and configured-grant PUSCH, then waveform switching capability is enabled, but interpretation ambiguity arises due to different scheduling methods
Solution Approach 1:
The patent applies different interpretation rules to the transform precoder indicator field based on the scheduling method. For dynamic grant PUSCH, the field indicates transform precoding enablement directly. For configured-grant PUSCH, the field interpretation depends on the NDI value: when NDI=0 it is reserved, when NDI=1 it indicates transform precoding enablement. This local differentiation resolves the ambiguity while maintaining waveform switching capability.
2Adaptability or versatility
If transform precoding is dynamically switched for configured-grant PUSCH, then channel adaptation is improved, but latency increases due to unnecessary waveform switching
Solution Approach 1:
The patent applies transform precoding dynamically only when necessary (when NDI=1 indicating new data transmission), while reserving the field when NDI=0 (indicating retransmission or activation). This partial application of waveform switching avoids unnecessary processing and latency while maintaining channel adaptation benefits when needed.
3Device complexity
If DCI size alignment is applied to ensure equal bit width for different RNTI-based DCI formats, then device complexity is reduced, but field interpretation becomes ambiguous
Solution Approach 1:
The patent maintains DCI size alignment for structural simplicity but introduces local interpretation rules based on the RNTI type and NDI value. The transform precoder indicator field is interpreted differently for C-RNTI (dynamic grant) versus CS-RNTI (configured-grant), allowing the same field structure to serve multiple scheduling methods without ambiguity.
Data Source
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AI summary
A method according to an embodiment of the present disclosure includes receiving configuration information related to a Physical Uplink Shared CHannel (PUSCH), receiving Downlink Control Information (DCI) including a New Data Indicator (NDI) field, and transmitting the PUSCH based on the DCI. Based on a parameter related to a presence of a transform precoder indicator field in the DCI being configured based on the configuration information, the transform precoder indicator field is based on 1 bit. A value of the 1 bit indicates that a transform precoder is enabled or disabled. Based on i) a Cyclic Redundancy Check (CRC) related to the DCI being scrambled by a Configured Scheduling (CS)-Radio Network Temporary Identifier (RNTI) and ii) a value of the NDI field being '0': the 1 bit is reserved.