Demodulation Reference Signal Transmission in 5G NR
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Solution Overview
Problem
The existing reference signal transmission solutions in LTE are not suitable for 5G new radio access (NR) systems due to high resource overheads, which is a challenge for efficient signal demodulation and channel estimation in 5G NR systems.
Innovation Solution
A signal transmission method where a reference signal is sent in a specific time-frequency resource located on symbols corresponding to a synchronization signal block, allowing for discrete mapping and reducing resource overheads by not being distributed across the entire system bandwidth, and using linear interpolation for channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference signal is distributed across the entire system bandwidth as in LTE, then the demodulation accuracy is maintained, but the resource overhead becomes excessively high for 5G NR systems
Solution Approach 1:
The reference signal is segmented and transmitted only in specific time-frequency resources associated with the synchronization signal block, rather than being distributed across the entire system bandwidth. This segmentation maintains demodulation accuracy for the critical synchronization and broadcast channels while significantly reducing overall resource overhead.
Solution Approach 2:
The reference signal is concentrated in specific local regions (time-frequency resources corresponding to synchronization signal block) rather than uniformly distributed. This local quality approach ensures high demodulation accuracy where it is most needed while avoiding waste in other regions.
2Quantity of substance
If the reference signal is transmitted in limited specific time-frequency resources, then the resource overhead is reduced, but the channel estimation accuracy may deteriorate
Solution Approach 1:
The reference signal is transmitted in advance within the synchronization signal block structure, enabling the terminal to perform channel estimation before decoding the broadcast channel. This preliminary action ensures that accurate channel state information is available when needed for demodulation.
Solution Approach 2:
The reference signal acts as an intermediary element within the synchronization signal block, providing the necessary channel information that mediates between the transmitted signal and the received signal, enabling accurate demodulation without requiring extensive reference signals across the entire bandwidth.
3Productivity
If the reference signal is discretely mapped in specific time-frequency resources, then the resource utilization efficiency is improved, but the complexity of resource mapping increases
Solution Approach 1:
The resource mapping of the reference signal is dynamically determined based on the synchronization signal block structure and cell identifier. This dynamic approach allows flexible resource utilization while the underlying pattern follows systematic rules that manage complexity.
Solution Approach 2:
The reference signal mapping parameters (time-frequency locations) are changed based on cell identifier and synchronization signal block configuration. This parameter-based approach enables different cells to use different mapping patterns, improving resource utilization while maintaining manageable complexity through systematic parameter selection.
Data Source
AI summary
A signal transmission method and an apparatus are disclosed. In an embodiment a signal transmission method includes generating a reference signal and sending the reference signal, wherein the reference signal is sent in a specific time-frequency resource, and the specific time-frequency resource is located on symbols corresponding to a synchronization signal block.