CSI Feedback Port Selection for Lower NR Reporting Overhead
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Solution Overview
Problem
The existing 3GPP Release 17 NR Type II port-selection codebook for wireless communications lacks defined mechanisms for configuring the number of selected CSI-RS ports and efficient reporting of non-zero coefficients, leading to increased feedback overhead and computational complexity in wireless devices.
Innovation Solution
A method for configuring the number of selected CSI-RS ports by multiplying the total number of CSI-RS ports by a ratio value and optimizing non-zero coefficient reporting, reducing feedback overhead and improving performance tradeoffs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the total number of CSI-RS ports is increased to improve channel measurement accuracy, then measurement precision is improved, but feedback overhead and computational complexity increase
Solution Approach 1:
The patent segments the total set of CSI-RS ports into two distinct groups: a first set of ports used for channel measurement and a second set of ports used for interference measurement. This segmentation allows the wireless device to process fewer ports for each specific measurement task, reducing computational complexity while maintaining measurement accuracy by dedicating specific ports to specific measurement purposes.
Solution Approach 2:
The patent extracts and separates the channel measurement function from the interference measurement function by allocating different port sets to each function. The first set of CSI-RS ports is specifically extracted for channel measurement, while the second set is extracted for interference measurement, allowing independent optimization of each measurement process and reducing overall computational burden.
2Measurement precision
If the total number of CSI-RS ports is increased to improve channel measurement accuracy, then measurement precision is improved, but feedback overhead increases
Solution Approach 1:
The patent segments the CSI-RS ports into dedicated sets for channel and interference measurements, which enables more efficient feedback reporting. By separating the measurement functions, the feedback overhead is reduced as each measurement type can be reported independently with optimized reporting configurations, rather than requiring comprehensive feedback on all ports.
Solution Approach 2:
The patent extracts specific port sets for specific measurement purposes, allowing the system to report only the relevant measurement results for each port set. This extraction approach reduces feedback overhead by eliminating redundant information and allowing selective reporting of channel quality indicators and precoding matrix indicators based on the dedicated channel measurement ports.
3Productivity
If channel dependent precoding is implemented to improve data rates, then productivity is improved, but device complexity increases due to CSI feedback requirements
Solution Approach 1:
The patent segments CSI feedback into separate components corresponding to channel measurements and interference measurements performed on dedicated port sets. This segmentation simplifies the overall CSI feedback process by allowing independent configuration and reporting of channel quality indicators and precoding matrix indicators based on the first set of ports, reducing the complexity of coordinated feedback mechanisms.
Solution Approach 2:
The patent extracts the channel measurement function to a dedicated set of CSI-RS ports, separating it from interference measurement functions. This extraction enables simplified CSI feedback configurations where channel quality indicators and precoding matrix indicators can be computed and reported based solely on the channel measurement ports, reducing feedback complexity while maintaining the benefits of channel dependent precoding for high data rates.
Data Source
AI summary
A method, system and apparatus are disclosed. According to one or more embodiments, a wireless device configured to communicate with a network node implementing a plurality of Channel State Information-Reference Signal, CSI-RS, ports is provided. The wireless device includes processing circuitry configured to: receive a configuration of a CSI-RS resource that is associated with the plurality of CSI-RS ports, determine at least a subset of the plurality of CSI-RS ports for performing a CSI-RS measurement within the CSI-RS resource where the determination is based on a calculation using a total number of the plurality of CSI-RS ports and a ratio value, and perform the CSI measurement based on the determined subset of the plurality of CSI-RS ports.