Group Common DCI Waveform Switching for 5G Uplink
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Solution Overview
Problem
Current 5G communication systems lack dynamic waveform switching capabilities between DFT-s-OFDM and CP-OFDM for uplink transmissions, limiting flexibility and efficiency in waveform configuration, especially for cell-edge UEs where high transmit power is needed.
Innovation Solution
Incorporating a waveform switching indication bit in the group common downlink control information signal, allowing for dynamic switching between DFT-s-OFDM and CP-OFDM waveforms based on specific indication bits, enabling flexible waveform selection without altering existing DCI formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If waveform switching capability is added to 5G uplink, then adaptability and versatility are improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic waveform switching by introducing a waveform indication field in DCI format 0_1 that allows real-time selection between DFT-s-OFDM and CP-OFDM waveforms. The switching is controlled dynamically through network signaling rather than being fixed, enabling the system to adapt waveform selection based on current transmission conditions while maintaining manageable device complexity through standardized control mechanisms.
2Loss of information
If waveform switching indication bit is added to DCI signal, then information completeness is improved, but signal length increases
Solution Approach 1:
The patent utilizes an existing reserved bit or field in DCI format 0_1 for waveform indication purposes, rather than adding a completely new field. This multi-functional approach allows the same DCI structure to serve both its original scheduling function and the additional waveform selection function, thereby providing complete waveform indication information without significantly increasing the overall signal length.
3Productivity
If dynamic waveform switching is implemented, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent changes the waveform parameter dynamically by introducing a waveform indication field that specifies which waveform (DFT-s-OFDM or CP-OFDM) should be used for the scheduled transmission. This parameter change mechanism allows the system to optimize data throughput by selecting the appropriate waveform based on transmission conditions while keeping device complexity manageable through standardized control procedures.
Data Source
AI summary
An apparatus including at least one processor; and at least one non-transitory memory storing instructions that, when executed with the at least one processor, cause the apparatus to perform: receiving a group common downlink control information signal, where the group common downlink control information signal comprises at least one waveform switching indication bit; and determining, based upon the at least one waveform switching indication bit, information configured to be used for determining waveform switching.