SRS Symbol Allocation for Channel Estimation Accuracy
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Solution Overview
Problem
As network load increases, existing SRS transmission methods face challenges in ensuring accurate channel estimation for uplink PUSCH transmission due to limited time domain resources, affecting downlink throughput.
Innovation Solution
Allocating more symbols in a slot for SRS transmission, allowing the access network device to use at least one of the first eight symbols or any combination of symbols from the ninth to the fourteenth symbol, enabling more flexible and accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRS transmission periodicity is prolonged to ensure uplink PUSCH transmission, then uplink transmission is maintained, but channel estimation accuracy deteriorates
Solution Approach 1:
The patent extends the time domain resource allocation from the conventional limited range to cover the entire slot duration. By allowing SRS transmission in the first symbol to the eighth symbol (and optionally ninth to fourteenth symbol) of a slot, the system transforms a constrained time-domain problem into an extended time-domain solution, enabling sufficient sampling points for accurate channel estimation while maintaining uplink transmission capability.
Solution Approach 2:
The patent introduces flexible and adaptive symbol allocation mechanisms. The network can dynamically configure which symbols are used for SRS transmission based on current system conditions, allowing the system to adapt between different operational modes (e.g., normal mode with limited symbols, enhanced mode with more symbols) to balance channel estimation accuracy and uplink transmission requirements.
2Measurement precision
If more symbols are allocated for SRS transmission, then channel estimation accuracy is improved, but time domain resource consumption increases
Solution Approach 1:
The patent segments the slot into different symbol ranges for SRS transmission. By dividing the slot into first symbol to eighth symbol (primary allocation) and ninth symbol to fourteenth symbol (optional allocation), the system can flexibly allocate time domain resources based on actual needs, achieving accurate channel estimation while minimizing unnecessary time consumption.
Solution Approach 2:
The patent changes the time domain resource parameters by extending the SRS transmission window from the conventional limited symbols to potentially all 14 symbols in a slot. This parameter change allows the system to adjust the time consumption based on channel estimation requirements, enabling accurate measurement while controlling resource usage through configurable allocation.
Data Source
AI summary
The technology described herein relates to an SRS transmission method, an access network device, and a terminal device. The method includes sending channel sounding reference signal (SRS) time domain resource indication information to a terminal device, where the SRS time domain resource indication information indicates an SRS time domain resource, and the SRS time domain resource includes at least one of a first symbol to an eighth symbol in a first slot. The method further includes receiving an SRS from the terminal device on the SRS time domain resource.