Terminal Waveform Switching via DCI and MAC CE
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Solution Overview
Problem
Conventional radio communication systems require RRC reconfiguration for waveform switching, leading to increased signaling overhead and potential decreases in communication throughput.
Innovation Solution
A terminal that dynamically switches the configuration of a transform precoder for the PUSCH using DCI or MAC CE, allowing for waveform switching without RRC reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waveform switching is performed using RRC reconfiguration, then waveform switching capability is achieved, but signaling overhead increases and communication throughput may decrease
Solution Approach 1:
The patent segments the waveform switching control into two parts: RRC configuration provides the basic waveform setting, while DCI provides dynamic switching control. This segmentation allows the system to maintain waveform switching capability through RRC while using DCI to reduce signaling overhead for actual switching operations.
Solution Approach 2:
The patent introduces DCI as an intermediary mechanism between RRC configuration and actual waveform transmission. The DCI carries waveform switching indicators that enable dynamic waveform switching without requiring full RRC reconfiguration, thus reducing signaling overhead while maintaining adaptability.
2Adaptability or versatility
If waveform switching is performed using RRC reconfiguration, then waveform switching capability is achieved, but communication throughput may decrease
Solution Approach 1:
By segmenting waveform control into RRC configuration and DCI-based dynamic switching, the patent enables faster waveform changes without the delay of full RRC reconfiguration procedures, thereby maintaining throughput while achieving adaptability.
Solution Approach 2:
The RRC configuration performs preliminary setup of waveform parameters in advance, so that when waveform switching is needed, only the switching indicator needs to be sent via DCI rather than reconfiguring all parameters, thus maintaining high throughput while enabling waveform adaptability.
3Manufacturing precision
If a longer period is used from DCI reception to PUSCH transmission for waveform switching, then waveform switching accuracy is improved, but transmission delay increases
Solution Approach 1:
The patent dynamically adjusts the timing relationship between DCI reception and PUSCH transmission based on whether waveform switching is detected. When waveform switching is indicated, a longer period is used to ensure accurate switching; when no switching is needed, the normal shorter timing is maintained, thus balancing accuracy and delay.
Solution Approach 2:
The patent changes the timing parameter (period from DCI to PUSCH) based on the waveform switching state. By adjusting this parameter dynamically according to the switching requirement, the system achieves accurate waveform switching when needed while minimizing transmission delay during normal operation.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration indicating that disabling or enabling of a transform precoder for a physical downlink shared channel (PUSCH) is dynamically switched by at least one of downlink control information (DCI) and a Medium Access Control Control Element (MAC CE), and a control section that uses, as a period from reception of the DCI until transmission of the PUSCH, a second period longer than a first period in a case where the waveform is not switched. According to one aspect of the present disclosure, it is possible to easily perform switching of a waveform.