CSI Measurement with Discontinuous RS for Channel Aging
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Solution Overview
Problem
Channel aging in CSI measurement leads to deteriorated receiving quality of PDSCH due to rapid changes in the terminal-base station channel, and shortening SRS periodicity to avoid this causes a waste of time-frequency resources.
Innovation Solution
Implement a CSI measurement method using a first RS that occupies discontinuous frequency domain resource segments, allowing for a shorter periodicity without wasting resources, and utilize joint measurements with a second RS to obtain instantaneous CSI, thereby improving resource utilization and matching the current downlink CSI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the SRS sending periodicity is shortened to avoid channel aging, then the downlink CSI accuracy is improved, but the time-frequency resource waste increases
Solution Approach 1:
The frequency domain resources are divided into multiple segments, and the RS is transmitted on only a subset of these segments in each time domain unit. This segmentation allows the system to maintain adequate measurement accuracy while reducing the total resource consumption, resolving the contradiction between CSI accuracy and resource efficiency.
Solution Approach 2:
Instead of transmitting RS on all frequency domain resources, the patent transmits RS on only a partial set of frequency domain resource segments. This partial action is sufficient to capture the essential channel characteristics for mobility scenarios while significantly reducing resource waste.
2Reliability
If the SRS sending periodicity is shortened to avoid channel aging, then the receiving quality of PDSCH is improved, but the time-frequency resource consumption increases
Solution Approach 1:
By segmenting frequency domain resources and selectively activating only necessary segments for RS transmission, the system achieves reliable CSI measurement for improved PDSCH reception while minimizing overall resource consumption.
Solution Approach 2:
The patent changes the transmission parameter configuration by controlling which frequency domain resource segments are active for RS transmission. This parameter control allows the system to adapt resource usage to actual channel conditions, maintaining reliability while reducing consumption.
3Measurement precision
If the SRS sending periodicity is shortened to avoid channel aging, then the precoding matrix accuracy is improved, but the resource utilization efficiency deteriorates
Solution Approach 1:
The frequency domain is segmented into multiple resource segments, allowing the system to transmit RS on only the necessary segments. This maintains precoding matrix accuracy through adequate sampling while improving resource utilization efficiency by avoiding transmission on unnecessary segments.
Solution Approach 2:
The system dynamically controls transmission parameters by selecting which frequency domain resource segments are active, thereby optimizing the balance between precoding matrix accuracy and resource utilization efficiency according to actual channel conditions.
Data Source
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AI summary
This application provides a CSI measurement method and apparatus. In the method, a terminal may send, to a network device, a first RS that occupies a plurality of frequency domain resource segments in one time domain unit, where the plurality of frequency domain resource segments are discontinuously distributed on a frequency band of the terminal, and the network device receives the first RS on a corresponding frequency domain resource segment, and measures CSI based on the first RS. Currently, to avoid channel aging, a method is to shorten an SRS periodicity. Because frequency domain resources occupied by the SRS are continuously distributed on an entire frequency band, this method leads to a waste of time-frequency resources. However, the first RS in this application is discontinuously distributed on a frequency band of the terminal, and a relatively small quantity of time-frequency resources are occupied. Therefore, a periodicity of the first RS can be shortened, thereby avoiding channel aging. This application relates to the field of communication technologies.