CSI Feedback Parameter Signaling With Reduced Combination Overhead
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Solution Overview
Problem
The large number of parameter combinations in the coefficient matrix configurations for terminal devices in Release 17 leads to significant overheads in network device communication.
Innovation Solution
Introduce a parameter α as a port selection coefficient, reducing the ternary parameter combination (β, K1, Mv) to (β, α, Mv), allowing for a smaller number of parameter combinations, such as 8, thereby reducing the configuration overheads by using fewer bits for indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device reports all possible parameter combinations (56 combinations) to the network device, then the network device can select the most appropriate parameter combination for precise channel state information feedback, but the configuration overhead increases significantly due to the large number of bits required for indication
Solution Approach 1:
The patent segments the parameter combination indication into two parts: a first indication information sent by the network device to the terminal device indicating a first parameter combination from a reduced set of 8 combinations, and a second indication information sent by the terminal device to the network device indicating K2 non-zero elements. This segmentation allows the network device to control the precision level while the terminal device provides detailed coefficient information only when needed, reducing overall overhead while maintaining feedback precision.
Solution Approach 2:
The patent introduces dynamic parameter adjustment where the terminal device can adaptively select between different parameter combinations based on channel conditions. The first parameter combination from the reduced set determines the maximum number of non-zero elements K0, while the actual number K2 is dynamically adjusted based on channel state, allowing precise feedback when channel conditions require it while saving overhead when conditions are stable.
2Adaptability or versatility
If the network device configures a large number of parameter combinations (56 combinations) to the terminal device, then the terminal device has more flexibility in selecting optimal parameters for different channel conditions, but the number of bits required for indication increases from 5 bits to 6 bits or more
Solution Approach 1:
The patent creates a universal first parameter combination from a reduced set of 8 combinations that can serve multiple channel conditions. This first parameter combination indicates the maximum number of non-zero elements K0, which can then be dynamically adjusted to K2 ≤ K0 based on specific channel conditions. This multi-functional approach allows the reduced set to cover the adaptability needs of all 56 original combinations while using only 3 bits instead of 6 bits.
Solution Approach 2:
The patent changes the parameter representation from indicating all 56 combinations directly to indicating a first parameter combination from 8 combinations plus a second indication of K2 non-zero elements. This parameter transformation reduces the indication bit length from 6 bits to 3 bits for the first indication, while the second indication of K2 provides the necessary flexibility for different channel conditions.
3Loss of information
If the terminal device uses a reduced set of parameter combinations (8 combinations), then the configuration overhead is reduced with fewer bits for indication, but the network device has fewer options for selecting the most appropriate parameter combination
Solution Approach 1:
The patent adds a new dimension to the parameter indication by separating it into two independent parts: the first indication information selecting from 8 parameter combinations (3 bits), and the second indication information specifying K2 non-zero elements. This dimensional separation allows the reduced set of 8 combinations to provide overhead reduction while the additional K2 dimension restores the adaptability lost by reducing from 56 to 8 combinations.
Solution Approach 2:
The first parameter combination from the reduced set acts as an intermediary that determines the maximum number of non-zero elements K0. This intermediary then mediates between the reduced option set and the actual channel conditions by allowing K2 to be adjusted within the range [1, K0], effectively bridging the gap between limited options and diverse channel requirements.
Data Source
AI summary
In accordance with an embodiment, a method includes receiving first indication information from a network device, where the first indication information indicates a first parameter combination including at least two of the following: a first value of Mv, a first value of β, and a first value of α. The first parameter combination is configured to be used to determine a a maximum of K0 non-zero elements for a first coefficient matrix, and K0 is determined based on the first values of Mv, β, and α; sending a second information indication to the network device, where the second indication information indicates K2 non-zero elements in the first coefficient matrix, and K2 is less than or equal to K0.