CSI Frequency-Domain Indication for Lower-Overhead Channel Measurement
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Solution Overview
Problem
In massive MIMO systems, obtaining channel state information (CSI) from a large number of user equipments (UEs) leads to high communication overheads and inflexible control, affecting performance.
Innovation Solution
A method for indicating CSI measurement by configuring frequency domain units with flexible indication information, allowing network and terminal devices to control CSI measurement based on system status, such as reference signal ports, bandwidth, and transmission power, to enhance CSI acquisition precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI measurement is performed on all frequency resources to ensure comprehensive channel state information, then measurement precision is improved, but communication overhead increases and flexibility is reduced
Solution Approach 1:
The patent segments the frequency domain resources into multiple frequency domain units (e.g., subbands) and selectively indicates only certain units for CSI measurement. Instead of requiring measurements across the entire frequency spectrum, the network device configures specific frequency domain units through indication information, dividing the measurement task into manageable segments that reduce overhead while maintaining essential measurement precision.
Solution Approach 2:
The patent applies partial action by having the terminal device perform CSI measurement only on the indicated frequency domain units rather than all available resources. The indication information specifies a subset of frequency domain units (using parameters like start position and spacing), allowing the system to obtain sufficient CSI with reduced measurement burden and lower communication overhead.
2Productivity
If CSI measurement is restricted to reduce overhead, then communication efficiency is improved, but control flexibility is reduced
Solution Approach 1:
The patent implements dynamic control through indication information that can be flexibly configured by the network device. The indication parameters (such as start frequency domain unit and spacing) can be adjusted in real-time based on system conditions, traffic patterns, and channel characteristics, allowing the system to adaptively balance overhead reduction with measurement adequacy. This dynamic configuration maintains control flexibility while improving communication efficiency.
Solution Approach 2:
The patent changes the parameters of CSI measurement configuration through indication information, specifically modifying which frequency domain units are selected for measurement. By varying parameters like the start position, spacing between units, and total number of indicated units, the system can adapt the measurement strategy to different scenarios, maintaining flexibility while reducing overhead in appropriate conditions.
3Measurement precision
If frequency domain units are densely distributed to improve measurement accuracy, then CSI precision is improved, but indication information complexity increases
Solution Approach 1:
The patent uses compact parameter representation to indicate frequency domain units. Instead of explicitly listing each frequency domain unit, the indication information employs parameters such as start position and spacing (period) to define the pattern. This parameter-based approach efficiently describes densely distributed units without creating complex indication structures, maintaining measurement precision while keeping the indication information concise and manageable.
Data Source
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AI summary
This application provides a method for indicating channel state information CSI measurement and a communication apparatus. A network device indicates, to a terminal device by using first indication information, one or more frequency domain units in a downlink reference signal resource that are used by the terminal device to obtain CSI. The terminal device can determine, based on the first indication information, which frequency domain units in the downlink reference signal resource are used to obtain the CSI, and perform measurement in the frequency domain unit to obtain the CSI. The network device may flexibly configure CSI measurement based on a system status, to control obtaining of the CSI. This helps the terminal device obtain the CSI more pertinently based on the indication in different cases.