CSI Measurement Adaptation for Flexible TDD Configurations
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Solution Overview
Problem
In LTE TDD systems, flexible adjustment of uplink-downlink configurations by base stations makes it difficult to effectively measure channel state information (CSI), leading to inaccurate interference measurements and reduced data transmission performance.
Innovation Solution
A method where terminal devices determine whether a subframe with a channel state information interference measurement resource is a downlink subframe before executing interference measurements, using configuration information, downlink scheduling, or control channels to ensure accurate CSI measurement, and network side devices configure CSI-IM resources for multiple subframe groups with varying periods and triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If base stations flexibly adjust uplink-downlink configurations according to traffic load, then system adaptability and traffic handling capability are improved, but interference measurement accuracy and CSI measurement reliability deteriorate
Solution Approach 1:
The patent applies dynamics by making the CSI measurement configuration adaptive to changing uplink-downlink configurations. The network device dynamically configures CSI measurement resources based on the current TDD configuration, allowing the measurement system to adapt flexibly to different traffic conditions while maintaining measurement accuracy. This resolves the contradiction by enabling both configuration flexibility and measurement reliability through dynamic adaptation.
Solution Approach 2:
The patent changes the parameter of CSI measurement resource configuration to match the uplink-downlink configuration. By adjusting the timing, frequency, and resource allocation of CSI measurements according to the active TDD configuration, the system maintains accurate interference measurements despite flexible configuration changes. This parameter adaptation resolves the contradiction between flexibility and measurement precision.
2Device complexity
If base stations use the same uplink-downlink configuration to control inter-cell interference, then interference management is simplified, but system flexibility and traffic adaptation capability are reduced
Solution Approach 1:
The patent segments the CSI measurement resources into different configurations corresponding to different uplink-downlink configurations. By creating separate measurement resource sets for different TDD configurations, the system can manage interference systematically while supporting configuration flexibility. This segmentation allows complex adaptive behavior to be organized in a manageable way, resolving the contradiction between simplicity and adaptability.
3Device complexity
If CSI measurement resources are configured with fixed periods, then measurement process is simplified, but measurement accuracy for dynamically changing interference conditions deteriorates
Solution Approach 1:
The patent makes the CSI measurement resource configuration dynamic by linking it to the uplink-downlink configuration. When the TDD configuration changes, the CSI measurement resources are reconfigured accordingly, ensuring measurements are taken at appropriate times for the current interference conditions. This dynamic approach resolves the contradiction between fixed-period simplicity and adaptive accuracy.
Data Source
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AI summary
Provided are methods and apparatuses for measuring CSI. The method comprises: a terminal device determining whether a subframe a channel state information interference measurement resource is located on is a downlink subframe; when the subframe where the channel state information interference measurement resource is located is a downlink subframe, the terminal device executing interference measurement by using the channel state information interference measurement resource. By means of the present disclosure, the technical problem is solved that it is difficult to effectively perform the CSI measurement caused when a base station flexibly adjust uplink-downlink configuration in a related technology, thereby achieving the technical effect of improving the data transmission performance of a system.