Aperiodic SRS Slot Selection for Efficient NR Uplink Signaling
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Solution Overview
Problem
The existing methods for triggering Aperiodic SRS transmission in terminals with 1T8R antenna configuration in NR MIMO systems are inefficient, leading to reduced transmission efficiency and increased overhead due to unscheduled SRS transmission in some slots, which deteriorates system performance.
Innovation Solution
A method is introduced to flexibly schedule Aperiodic SRS transmission by indicating a portion of candidate unit time resources for SRS transmission using trigger information, allowing dynamic adjustment of SRS transmission in some slots, thereby improving transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Aperiodic SRS transmission is triggered in multiple candidate slots, then coverage performance is improved, but transmission efficiency deteriorates due to unnecessary re-transmissions and overhead
Solution Approach 1:
The patent applies dynamics by making the SRS transmission configuration flexible and adjustable. The base station dynamically indicates which specific slots from the candidate slots should actually be used for SRS transmission, rather than fixing all candidate slots in advance. This dynamic adjustment allows the system to adapt to actual channel conditions and traffic requirements, improving transmission efficiency while maintaining coverage performance.
Solution Approach 2:
The patent changes the parameter of slot selection for SRS transmission. Instead of using all candidate slots uniformly, the system modifies the transmission parameters by selectively activating only the necessary slots based on current network conditions. This parameter change resolves the contradiction by reducing unnecessary transmissions (improving efficiency) while ensuring sufficient coverage through strategic slot selection.
2Measurement precision
If Aperiodic SRS transmission is scheduled in all candidate slots, then measurement precision is improved, but overhead increases
Solution Approach 1:
The patent extracts only the necessary SRS transmissions from the set of all candidate slots. By indicating specific slots where SRS should be transmitted, the system separates the essential measurements from unnecessary ones. This extraction reduces overhead by eliminating redundant SRS transmissions while maintaining measurement precision in the selected slots.
Solution Approach 2:
The patent applies partial action by transmitting SRS in only some of the candidate slots rather than all of them. The base station determines the optimal subset of slots based on current conditions, performing just enough measurements to achieve the required precision without the excessive overhead of transmitting in every candidate slot.
3Measurement precision
If Aperiodic SRS transmission is triggered frequently, then channel state information accuracy is improved, but system performance deteriorates due to increased overhead
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors channel conditions and system performance, then uses this feedback to intelligently determine which slots should trigger Aperiodic SRS transmission. This feedback loop allows the system to maintain high channel state information accuracy while optimizing the frequency of transmissions to prevent performance deterioration from excessive overhead.
Data Source
AI summary
The present invention improves reference signal transmission efficiency. A terminal is equipped with: a reception circuit for receiving information indicating some of a plurality of candidate unit-time resources for non-periodic transmission of reference signals; and a control circuit for, on the basis of the information, controlling the allocation of time resources to be used in the transmission of reference signals.