Uplink Waveform Switching for Coverage Enhancement
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively transmitting and receiving uplink signals, particularly in enhancing coverage and managing waveform changes in 5G mobile communication systems.
Innovation Solution
The proposed method involves a user equipment (UE) that receives downlink control information (DCI) scheduling physical uplink shared channel (PUSCH) transmission. The UE identifies the PUSCH transmission waveform, which can be either discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) or changed from a recent waveform. Based on this information, the UE determines a PUSCH preparation time and decides whether to transmit the PUSCH, considering gaps in PUSCH and PDCCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the PUSCH transmission waveform is changed from recent waveform to DFT-s-OFDM for coverage enhancement, then the coverage is improved, but the processing time requirement increases
Solution Approach 1:
The base station notifies the UE in advance about the waveform change through DCI signaling before the actual PUSCH transmission occurs. This preliminary notification allows the UE to prepare its processing in advance, ensuring that the required processing time is available while enabling the coverage-enhancing waveform change.
Solution Approach 2:
The patent implements dynamic waveform switching between CP-OFDM and DFT-s-OFDM based on coverage requirements. The UE can adaptively change the PUSCH transmission waveform dynamically through DCI signaling, allowing the system to optimize between coverage enhancement (DFT-s-OFDM) and processing efficiency (CP-OFDM) in real-time.
2Manufacturing precision
If the UE processes waveform change information from DCI, then the transmission accuracy is improved, but the processing complexity increases
Solution Approach 1:
The waveform indication information is extracted and conveyed through dedicated fields in the DCI message. By separating the waveform selection indication from other scheduling parameters and transmitting it through standardized DCI fields, the UE can process this information efficiently using existing DCI decoding mechanisms, reducing overall processing complexity while maintaining transmission accuracy.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting higher data rates. The disclosure relates to a method and apparatus capable of transmitting and receiving uplink signals for coverage enhancement in a wireless communication system. The method comprises: receiving, via a PDCCH, DCI scheduling a PUSCH transmission, wherein the DCI includes first information associated with a PUSCH transmission waveform; determining, based on the first information, whether the PUSCH transmission waveform is a DFT-s-OFDM or the PUSCH transmission waveform is changed from a recent PUSCH transmission waveform; identifying, based on a processing time parameter; determining whether to transmit the PUSCH transmission based on the PUSCH preparation time; and transmitting the PUSCH transmission in response to determining to transmit the PUSCH transmission.