Dynamic CQI Computation for Energy-Saving Wireless Scheduling
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Solution Overview
Problem
Existing CQI calculation mechanisms in wireless communication systems, particularly in energy-saving modes, fail to accurately and timely reflect data transmission channel quality due to dynamic adjustments in transmission power and antenna number, leading to inaccurate channel state information and quality indicators.
Innovation Solution
A method and apparatus for computing and indicating channel quality indicator (CQI) involving a terminal equipment that computes multiple CQIs based on different parameters, including reference signal port information and downlink transmission power, using dynamic indication information from a network device to adjust calculations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If network device dynamically adjusts transmission power and antenna number for energy saving, then energy consumption is reduced, but channel state information measurement becomes inaccurate and untimely
Solution Approach 1:
The terminal equipment calculates CQI values in advance for multiple possible transmission power levels and antenna configurations before the actual transmission occurs. This preliminary calculation allows the system to prepare accurate channel quality indicators ahead of time, resolving the contradiction by ensuring measurement accuracy is maintained even when dynamic adjustments are made during transmission.
Solution Approach 2:
The patent introduces multiple parameters (first parameter for initial CQI calculation, second parameter for adjusted CQI calculation) that change according to different transmission conditions. By changing the parameters based on actual transmission power and antenna configuration, the system maintains accurate CQI measurements while enabling dynamic energy-saving adjustments.
2Productivity
If terminal equipment uses fixed CQI calculation method, then calculation is simple and fast, but CQI cannot accurately reflect channel quality under dynamic transmission conditions
Solution Approach 1:
The CQI calculation method transitions from a fixed approach to a dynamic approach where the terminal equipment determines which calculation method to use based on current transmission conditions. The system dynamically switches between first CQI calculation (using first parameter) and second CQI calculation (using second parameter) depending on whether transmission power or antenna configuration has changed, maintaining both speed and accuracy.
Solution Approach 2:
The patent changes the parameters used in CQI calculation based on transmission conditions. By introducing different parameters for different scenarios (first parameter for normal conditions, second parameter for adjusted conditions), the system maintains calculation efficiency while improving accuracy under dynamic conditions.
3Loss of energy
If network device implements dynamic antenna adjustment for spatial-domain energy saving, then energy efficiency improves, but channel measurement timeliness deteriorates
Solution Approach 1:
The terminal equipment performs preliminary CQI calculations for multiple antenna configurations before actual transmission occurs. This allows the system to have ready-to-use channel quality indicators even when antenna adjustment happens dynamically during transmission, eliminating the timeliness loss that would otherwise occur.
Solution Approach 2:
The system establishes a feedback mechanism where the terminal equipment reports CQI values to the network device, which then uses this information to adjust transmission parameters. This feedback loop ensures that channel quality information is continuously updated and reflected in transmission decisions, maintaining timeliness despite dynamic antenna adjustments.
Data Source
AI summary
A method and an apparatus for computing and indicating channel quality indicator (CQI), the method including: a terminal equipment computes a first channel quality indicator (CQI) according to a first parameter, and computes a second channel quality indicator (CQI) according to a second parameter.