CQI Reporting for Future-Moment Downlink Scheduling
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Solution Overview
Problem
Existing communication systems struggle to accurately predict and report Channel Quality Indications (CQIs) for future moments, especially in scenarios where terminals are moving at medium to high speeds, leading to inaccurate and unstable downlink transmissions.
Innovation Solution
A method for terminals to determine specific moments for CQI calculation and reporting, using various methods such as autonomous determination, base station indication, or predefined rules, and calculating CQIs based on CSI-RS or DMRS, ensuring timely and accurate CQI reporting to base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CQI prediction methods are implemented for future moments, then downlink transmission accuracy is improved, but system complexity increases due to lack of standardized implementation methods
Solution Approach 1:
The patent applies preliminary action by having the terminal calculate and report CQIs for future moments in advance, before the actual downlink transmission occurs. The terminal determines first moments (future moments) and calculates corresponding CQIs beforehand, enabling the base station to use these pre-calculated CQIs for accurate downlink transmission scheduling.
2Adaptability or versatility
If terminal moves at medium to high speeds, then communication flexibility is improved, but channel changes rapidly causing CQI accuracy deterioration
Solution Approach 1:
The patent addresses rapid channel changes at medium to high speeds by having the terminal perform CQI calculations for future moments in advance. This preliminary calculation allows the system to anticipate channel conditions rather than reacting to changes after they occur, maintaining CQI accuracy despite rapid mobility.
Solution Approach 2:
The patent applies dynamics by enabling the terminal to adaptively determine which future moments require CQI calculation based on actual channel conditions and mobility state. The system dynamically adjusts the reporting strategy according to the terminal's movement characteristics, optimizing between accuracy and overhead.
3Reliability
If multiple future moments are reported, then downlink transmission reliability is improved, but reporting overhead increases
Solution Approach 1:
The patent applies partial action by having the terminal report CQIs for a selected set of future moments rather than all possible moments. The terminal determines at least one first moment (which could be a single moment or a limited set) and reports CQIs only for those moments, balancing reliability improvement with overhead control.
Data Source
AI summary
The present disclosure provides a CQI reporting method and device. A terminal determines at least one first moment; calculates CQIs of the terminal for the at least one first moment; and reports the CQIs to a base station.