Single Carrier Waveform Hopping for 5G Diversity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, single carrier waveforms face challenges in achieving diversity gains due to their use of entire bandwidth symbols, which limits their ability to mitigate fading channels and inter-user interference, and requires costly beam failure detection and recovery procedures.
Innovation Solution
Implementing beam hopping, precoder hopping, and time hopping techniques to provide transmit diversity by changing beams, precoders, or transmission formats across time periods, allowing for improved robustness against fading and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single carrier waveform uses entire bandwidth allocation over a period of time, then spectral efficiency is improved, but ability to mitigate fading channels and inter-user interference deteriorates
Solution Approach 1:
The single carrier waveform transmission is segmented into multiple transmission parts within a symbol, with each part using a different beam. This allows the system to maintain full bandwidth utilization while providing diversity across different spatial directions, thereby mitigating fading and interference without sacrificing spectral efficiency.
Solution Approach 2:
The system dynamically switches beams across different transmission parts within a symbol period. This dynamic beam hopping allows the transmission to adapt to channel conditions in real-time, providing diversity gains while maintaining continuous bandwidth utilization for spectral efficiency.
2Device complexity
If single carrier waveform uses entire bandwidth allocation over a period of time, then transmission simplicity is improved, but beam failure detection and recovery cost increases
Solution Approach 1:
By segmenting the transmission into multiple parts with different beams, the system can detect beam failures at the granularity of individual transmission parts rather than entire symbols. This reduces the cost and time associated with beam failure detection and recovery procedures.
Solution Approach 2:
The system implements feedback mechanisms where the receiver can indicate which specific transmission parts experienced beam failure. This allows the transmitter to quickly identify and recover from failures without retransmitting entire symbols, reducing energy waste and maintaining transmission simplicity.
3Reliability
If beam hopping is implemented across multiple time periods, then transmit diversity is improved, but scheduling complexity increases
Solution Approach 1:
The beam hopping pattern is segmented into predefined transmission parts within each symbol, with each part assigned a specific beam from a configured set. This segmentation simplifies scheduling by providing a structured framework that reduces the complexity of managing beam switches across multiple time periods while maintaining transmit diversity.
Data Source
AI summary
Aspects described herein relate to scheduling, or configuring a node to schedule, a transmission in multiple time periods based on a hopping pattern, where the hopping pattern includes at least one of a beam hopping pattern, a precoder hopping pattern, or a time hopping pattern. The transmission can be transmitted or received in the multiple time periods based on the hopping pattern.