Terminal Reference Signal Parameter Feedback for Wireless Systems
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Solution Overview
Problem
In wireless communication systems, terminals do not participate in the determination of reference signal parameters, leading to performance losses, especially in scenarios with severe delay demands, robustness requirements, or high interference, where the base station's perception of measurement reference signals is poorer than the terminal's.
Innovation Solution
The terminal determines and feeds back reference signal parameters such as transmitting period, subframe offset, transmitting density, transmitting power, and number of ports for uplink and downlink measurement reference signals to the base station, allowing for more appropriate configuration of CSI-RS or SRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base station determines reference signal parameters unilaterally, then the base station can simplify the configuration process, but the system performance deteriorates due to mismatched channel measurement requirements
Solution Approach 1:
The terminal feeds back channel quality information and reference signal reception quality to the base station. The base station uses this feedback to adjust and optimize reference signal parameters, creating a closed-loop configuration process that improves system performance while maintaining operational simplicity.
Solution Approach 2:
The reference signal parameters are made dynamically adjustable based on terminal feedback and channel conditions. The base station can modify parameters such as reference signal power, frequency position, and time position according to real-time channel state information, enabling adaptive optimization of system performance.
2Measurement precision
If the terminal participates in reference signal parameter determination, then the channel measurement accuracy improves, but the device complexity increases due to additional determination and feedback operations
Solution Approach 1:
The terminal autonomously measures reference signal reception quality and generates channel quality information based on its own channel conditions. This self-service approach enables the terminal to participate in parameter optimization without requiring complex coordination protocols, thus improving measurement accuracy while limiting complexity growth.
3Measurement precision
If reference signal transmitting power is increased, then the channel estimation accuracy improves, but the use of energy increases
Solution Approach 1:
The reference signal transmitting power is dynamically adjusted based on terminal feedback regarding reference signal reception quality. When channel conditions are good, the power can be reduced; when conditions deteriorate, the power is increased to maintain estimation accuracy. This parameter adaptation resolves the contradiction between measurement precision and energy consumption.
4Loss of information
If the reference signal transmitting period is shortened, then the channel information freshness improves, but the loss of energy increases due to more frequent transmissions
Solution Approach 1:
The reference signal transmitting period is made dynamically adjustable based on channel variability and terminal mobility. For stationary terminals with stable channels, longer periods are used to reduce energy consumption. For mobile terminals with rapidly changing channels, shorter periods maintain information freshness. This dynamic adjustment resolves the contradiction between information freshness and energy loss.
Data Source
AI summary
Embodiments of the present disclosure provide a reference signal information feedback method, apparatus and terminal. The method includes: a terminal determines a reference signal parameter of an uplink measurement reference signal and/or a downlink measurement reference signal, and the terminal feeds the determined reference signal parameter back to a base station.