Pilot Data Pattern Design for URLLC Channel Estimation Delay
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Solution Overview
Problem
In the 5G communication system, particularly in the URLLC scenario, the existing pilot design fails to meet the requirement of low latency and high reliability due to significant pilot overhead, which increases delay and degrades spectrum utilization.
Innovation Solution
The proposed solution involves arranging prepositive pilots at a high density in the initial symbols of each sub-frame, allowing user equipment to perform channel estimation earlier, and dynamically updating pilot patterns based on channel coherence and service type to optimize pilot overhead and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pilots are arranged at high density in time and frequency domains to obtain accurate channel response, then channel estimation accuracy is improved, but pilot overhead increases and delay increases
Solution Approach 1:
The patent applies preliminary action by placing pilots at the initial time point of each sub-frame before data transmission begins. This allows the receiver to obtain channel response information earlier, reducing the delay in channel estimation while maintaining accurate measurement through proper pilot density arrangement in the frequency domain.
Solution Approach 2:
The patent segments the pilot arrangement by placing pilots only at initial time points of sub-frames rather than continuously throughout the transmission. This segmentation reduces the overall number of pilots required while ensuring accurate channel estimation at critical points, thereby reducing pilot overhead and reception delay.
2Measurement precision
If pilots are arranged at high density in time and frequency domains to obtain accurate channel response, then channel estimation accuracy is improved, but pilot overhead increases and spectrum utilization deteriorates
Solution Approach 1:
The patent segments the pilot arrangement by placing pilots only at initial time points of sub-frames rather than continuously throughout the transmission. This segmentation reduces the overall number of pilots required while ensuring accurate channel estimation at critical points, thereby reducing pilot overhead and improving spectrum utilization.
Solution Approach 2:
The patent applies local quality by concentrating pilot resources at specific critical positions (initial time points of sub-frames) where they are most needed for channel estimation, rather than uniformly distributing them throughout the entire time-frequency grid. This localized approach maintains estimation accuracy while reducing overall pilot overhead.
3Productivity
If the number of antenna ports is increased to improve MIMO performance, then system capacity is improved, but pilot overhead increases
Solution Approach 1:
The patent applies preliminary action by placing pilots at the initial time point of each sub-frame before data transmission begins. This allows the receiver to obtain channel response information earlier, reducing the delay in channel estimation while maintaining accurate measurement through proper pilot density arrangement in the frequency domain.
Solution Approach 2:
The patent segments the pilot arrangement by placing pilots only at initial time points of sub-frames rather than continuously throughout the transmission. This segmentation reduces the overall number of pilots required while ensuring accurate channel estimation at critical points, thereby reducing pilot overhead and improving spectrum utilization.
Data Source
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AI summary
Disclosed in the present application are a pilot sending and receiving method and device, configured to reduce a delay of receiving pilot data at a terminal, thus improving efficiency of channel estimation based on the pilot data. The pilot sending method provided in the present application comprises: determining a pilot data pattern configured for a user equipment unit, the pilot data pattern comprising time-frequency position information of pilot data, and the time-frequency position information comprising position information of an initial time point of the pilot data in a subframe; and sending to the user equipment unit, according to the pilot data pattern, the pilot data.