5G Signal Transmission Starting Position Selection
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Solution Overview
Problem
Existing 5G communication systems face challenges in determining the optimal starting point for transmitting signals, such as reference signals and UCI, which affects reception performance due to potential interference from Demodulation Reference Signals (DMRS) and Listen Before Talk (LBT) mechanisms.
Innovation Solution
A method for determining a symbol mapping of signals based on a selected or set of candidate starting positions, ensuring that reference signals and UCI are appropriately positioned to avoid interference and ensure good reception performance. This involves positioning DMRS within a complete OFDM symbol after the selected starting position and ensuring that control information starts not earlier than the boundary of an OFDM symbol.
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 reception performance deteriorates due to interference from DMRS and LBT mechanisms
Solution Approach 1:
The method segments the signal transmission by dividing it into multiple candidate starting positions, each aligned with OFDM symbol boundaries. This segmentation allows the system to maintain flexibility through multiple options while ensuring each segment starts at a reliable boundary position, thus resolving the contradiction between transmission flexibility and reception performance.
Solution Approach 2:
The method performs preliminary alignment of the signal starting position with OFDM symbol boundaries before transmission begins. By pre-positioning the signal at valid boundary-aligned starting points, the system ensures that subsequent transmission can proceed without interference from DMRS or LBT mechanisms, while still maintaining flexibility through the selection from multiple candidate positions.
2Quantity of substance
If the DMRS is positioned at the selected starting position, then the reference signal coverage is improved, but the control information reception deteriorates due to interference
Solution Approach 1:
The method applies local quality differentiation by positioning DMRS at specific candidate starting positions that are aligned with OFDM symbol boundaries, while control information is positioned at other locations that avoid DMRS interference. This localized optimization ensures that each signal type occupies the most suitable position for its function, resolving the contradiction between reference signal coverage and control information reception.
Solution Approach 2:
The method extracts the DMRS from the control information transmission path by positioning them at separate, non-overlapping locations. The DMRS is placed at candidate starting positions while control information is positioned to start not earlier than the boundary of an OFDM symbol, effectively separating the two signal types to eliminate mutual interference.
3Loss of time
If the signal transmission starts immediately after LBT detection, then the transmission delay is reduced, but the symbol mapping precision deteriorates
Solution Approach 1:
The method introduces dynamic adjustment to the symbol mapping process by allowing the starting position to be selected from multiple candidate positions based on LBT detection results. The system dynamically determines the optimal starting position from the candidate set that aligns with OFDM symbol boundaries, thus adapting to real-time channel conditions while maintaining mapping precision.
Solution Approach 2:
The method performs preliminary identification of candidate starting positions that align with OFDM symbol boundaries before actual transmission begins. By pre-establishing this set of valid starting positions, the system ensures that when transmission starts immediately after LBT detection, the symbol mapping precision is automatically maintained without requiring additional processing time.
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.