Frequency-Domain CSI Measurement to Reduce Signaling Overhead
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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 a terminal device, where the network device flexibly configures CSI measurement based on system status using frequency domain units, reducing indication overheads through efficient signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI measurement is performed on all frequency domain units, then measurement precision is improved, but communication overhead increases
Solution Approach 1:
The patent segments the frequency domain units into multiple groups and selectively performs CSI measurement only on specific groups (e.g., first and second frequency domain units) rather than all units. This segmentation approach maintains adequate measurement precision for system operation while significantly reducing the quantity of measurement data that needs to be reported, thereby lowering communication overhead.
Solution Approach 2:
The patent applies partial action by performing CSI measurement on only a subset of frequency domain units (partial measurement) rather than all units. The network device configures specific frequency domain units for measurement based on system conditions, achieving sufficient measurement accuracy for precoding and scheduling decisions without the excessive overhead of complete frequency domain measurement.
2Reliability
If CSI measurement is performed on all frequency domain units, then reliability is improved, but device complexity increases
Solution Approach 1:
The terminal device's measurement task is segmented into processing only specific frequency domain units (first and second groups) rather than all units. The network device provides configuration information indicating which units require measurement, reducing the computational complexity and processing burden on the terminal device while maintaining reliability through selective measurement of critical frequency resources.
Solution Approach 2:
The patent implements partial measurement action where the terminal device performs CSI measurement on a configured subset of frequency domain units rather than all units. This partial approach reduces terminal device complexity in terms of measurement processing, data buffering, and feedback generation, while the network device ensures measurement reliability by configuring appropriate frequency units based on system conditions.
3Productivity
If frequency domain units are selectively configured for CSI measurement, then productivity is improved, but measurement precision may deteriorate
Solution Approach 1:
The patent applies local quality by making the CSI measurement configuration adaptive to local system conditions. The network device selectively configures first and second frequency domain units for measurement based on specific conditions (e.g., channel characteristics, interference levels, traffic demands). This localized, condition-based configuration improves productivity by focusing measurement resources where they are most needed while maintaining measurement precision through intelligent selection of frequency units that capture essential channel state information.
Data Source
AI summary
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 determines, 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 flexibly configures 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.