PUSCH Waveform Switching via DCI Without RRC Reconfiguration
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Solution Overview
Problem
Existing radio communication systems require RRC reconfiguration for waveform switching between CP-OFDM and DFT-s-OFDM, leading to increased signaling overhead and reduced communication throughput.
Innovation Solution
Implement dynamic switching of waveforms using DCI/MAC CE to enable/disable the transform precoder for the Physical Uplink Shared Channel (PUSCH), allowing flexible waveform adaptation without RRC reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RRC reconfiguration is used for waveform switching, then waveform switching capability is achieved, but signaling overhead increases and communication throughput deteriorates
Solution Approach 1:
The patent implements dynamic waveform switching by enabling the transform precoder function through MAC CE or DCI signaling instead of static RRC reconfiguration. This allows the waveform to be dynamically changed based on current channel conditions (SNR, MCS) without triggering full RRC reconfiguration procedures, thereby reducing signaling overhead while maintaining adaptability.
Solution Approach 2:
The patent changes the control mechanism from RRC layer to physical layer (DCI) or MAC layer (MAC CE) by modifying how the transform precoder parameter is controlled. The base station can now dynamically adjust the transform precoder enable/disable state through compact DCI fields or MAC CE commands, changing the operational parameter without reconfiguring the entire RRC connection, thus reducing information loss.
2Adaptability or versatility
If RRC reconfiguration is used for waveform switching, then waveform switching capability is achieved, but processing load increases
Solution Approach 1:
The system transitions from static RRC-based waveform configuration to dynamic control via MAC CE and DCI. The terminal and base station maintain a pre-agreed waveform configuration through RRC, but actual waveform switching is achieved through lightweight dynamic commands, reducing the processing burden of frequent RRC reconfigurations while preserving adaptability to changing channel conditions.
Solution Approach 2:
The RRC configuration pre-establishes the waveform parameters and capabilities before actual transmission. This preliminary setup allows subsequent waveform switching to be achieved through simpler MAC CE or DCI commands rather than full RRC reconfiguration, reducing the processing load during active communication while maintaining the ability to switch waveforms when needed.
3Productivity
If transform precoder is dynamically switched, then waveform adaptation to SNR and MCS conditions is enabled, but DCI field configuration complexity increases
Solution Approach 1:
The patent applies local quality by adding transform precoder control specifically to the uplink grant DCI format rather than redesigning the entire DCI structure. The transform precoder enable/disable indication is inserted as a specific field within the existing DCI framework, allowing waveform adaptation to SNR and MCS conditions without requiring complete DCI reconfiguration, thus improving throughput while limiting complexity increase to a localized area.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives downlink control information (DCI), and a control section that ignores, when a physical uplink shared channel (PUSCH) waveform can be dynamically switched and a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform is indicated for the PUSCH, at least one of a demodulation reference signal (DMRS) sequence initialization field and a phase tracking reference signal (PTRS)-DMRS related field of the DCI. According to one aspect of the present disclosure, it is possible to appropriately switch a waveform.