5G Uplink Signal Transmission via Symbol Mapping
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Solution Overview
Problem
In 5G communication systems, especially on unlicensed bands, the existing methods for uplink transmission face challenges in determining the optimal starting point for transmitting signals like reference signals and UCI, leading to performance degradation due to interference and unsuccessful channel estimation.
Innovation Solution
A method that determines a symbol mapping for signals based on selected or candidate starting positions, ensuring that reference signals and UCI are transmitted at optimal boundaries within OFDM symbols, avoiding subcarriers occupied by DMRS, and performing Listen Before Talk (LBT) detection on subbands to successfully map bits on Physical Uplink/Downlink Shared Control Channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the signal starts at an arbitrary position within an OFDM symbol, then the transmission flexibility is improved, but the channel estimation accuracy deteriorates due to misalignment with reference signals
Solution Approach 1:
The method segments the OFDM symbol transmission by identifying specific starting positions (symbol boundaries) where signals can be transmitted. By dividing the continuous time domain into discrete symbol boundary segments, the system maintains transmission flexibility while ensuring alignment with reference signal positions for accurate channel estimation.
Solution Approach 2:
The patent applies local quality by treating different starting positions differently - signals starting at symbol boundaries receive full OFDM symbols for transmission, while signals starting at other positions are truncated. This localized differentiation ensures that channel estimation references always have proper alignment while maintaining flexibility for various transmission scenarios.
2Loss of time
If the signal is truncated to fit within remaining OFDM symbols, then the transmission timing is improved, but the signal quality deteriorates due to loss of signal components
Solution Approach 1:
The method applies partial action by transmitting only the portion of the signal that fits within the remaining OFDM symbols after the starting position, rather than attempting to transmit the full signal. This partial transmission approach maintains proper timing alignment while accepting that some signal components are omitted to avoid transmission errors.
Solution Approach 2:
The system performs preliminary determination of the starting position and calculates the number of transmittable symbols before actual signal transmission. This preliminary action ensures that the signal is properly truncated to fit within available time resources, preventing timing conflicts and ensuring reliable transmission within the allocated slot.
3Productivity
If multiple UEs transmit simultaneously on the same time-frequency resources, then the resource utilization is improved, but the interference level increases causing reception failures
Solution Approach 1:
The patent segments the time-frequency resources by dividing the slot into multiple starting positions and assigning different UEs to different starting positions or resource blocks. This segmentation allows multiple UEs to transmit simultaneously on the same nominal resources while actually using different time-frequency segments, thereby maintaining high resource utilization while reducing interference through spatial and temporal separation.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.Embodiments of the present invention provide a method for transmitting a signal, comprising: selecting a starting position of the signal from a set of candidate starting positions for transmitting the signal; determining a symbol mapping of the signal based on a selected starting position or a set of candidate starting positions of the signal; and transmitting the signal is based on the symbol mapping. The embodiment of the invention also provides a corresponding apparatus.