Terminal CQI Calculation for LTE Transmission Mode 9 Accuracy
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Solution Overview
Problem
The existing LTE system fails to accurately obtain channel quality indication information when using transmission mode 9, leading to reduced system flexibility and performance due to the absence of necessary conditions for CQI calculation.
Innovation Solution
A method for calculating channel quality indication information is provided, where user equipment performs channel measurements based on CSI-RS or CRS, determining CSI reference sources and CQI calculation conditions, and calculates CQI values accordingly, considering various factors and complex conditions to ensure accurate CQI acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission mode 9 is used in LTE system, then spatial multiplexing performance is improved, but channel quality indication accuracy deteriorates due to absence of necessary CQI calculation conditions
Solution Approach 1:
The patent applies preliminary action by pre-defining CQI calculation conditions and reference resource configurations before actual channel quality measurement. The method establishes predetermined rules for selecting CSI reference resources and determining CQI calculation parameters, ensuring that accurate CQI can be obtained without increasing system complexity during runtime.
2Adaptability or versatility
If multiple transmission modes (SU-MIMO and MU-MIMO) are supported, then system versatility is improved, but control signaling complexity increases due to different control data requirements
Solution Approach 1:
The patent applies universality by creating a unified CQI calculation framework that works across multiple transmission modes (SU-MIMO, MU-MIMO, and transmission mode 9). The method defines universal reference resource selection criteria and CQI calculation conditions that can be applied regardless of the specific transmission mode, reducing the need for mode-specific control signaling.
3Device complexity
If CQI calculation conditions are not defined, then system complexity is reduced, but channel quality measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically determining CQI calculation conditions based on configured parameters such as PMI/RI configuration status and CSI-RS port count. The method adjusts reference resource selection and CQI calculation parameters according to these configuration states, achieving accurate CQI measurement without requiring a completely separate framework for each scenario.
Data Source
AI summary
Disclosed in the present document are a method and terminal for calculating channel quality indication information. The method includes: a terminal performing a channel measurement according to a received cell state information-reference signal (CSI-RS) or cell reference signal (CRS), determining a channel state information (CSI) reference resource, and determining channel quality indication (CQI) calculation conditions, then the terminal calculating a CQI value corresponding to the CSI reference resource according to the determined conditions and the measurement result. The present document makes a reasonable setting of the CQI calculation conditions, and ensures performance and effectiveness of system link self-adaptation.