Terminal CSI-IM Resource Selection for Multi-Station Interference Measurement
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Solution Overview
Problem
Current multi-station coordinated transmission mechanisms in LTE and NR networks face inaccuracies in channel state information (CSI) measurement due to dynamic information exchange delays, leading to poor data demodulation performance, especially at the edge of base station coverage areas where interference is significant.
Innovation Solution
A method where a terminal device receives downlink control information to pre-schedule CSI reporting, allowing it to measure and report CSI without dynamic information exchange by associating CSI reports with specific CSI-RS and CSI-IM resources, enabling accurate interference measurement and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic information exchange between base stations is implemented for coherent joint transmission, then data transmission performance is improved, but transmission delay increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CSI-IM resources and establishing measurement rules before actual transmission. The terminal device is pre-instructed on which CSI-IM resources to measure and how to report CSI, eliminating the need for dynamic information exchange during transmission. This prepares the system in advance, allowing immediate transmission without delay while maintaining accurate channel state information.
Solution Approach 2:
The patent uses copying by having the terminal device measure and report CSI based on pre-configured CSI-IM resources from multiple base stations. Instead of requiring real-time information exchange between base stations, the terminal device independently measures and reports channel state information that copies the interference conditions, enabling base stations to make scheduling decisions without dynamic coordination.
2Loss of time
If each base station independently makes CSI reporting decisions, then transmission delay is reduced, but CSI measurement accuracy deteriorates
Solution Approach 1:
The patent applies universality by designing a multi-functional CSI-IM resource configuration where the same pre-configured resource structure serves multiple base stations simultaneously. The terminal device uses the same measurement and reporting mechanism for all serving base stations, ensuring consistent and accurate CSI measurement across multiple stations without requiring each station to independently manage separate reporting procedures.
Solution Approach 2:
The patent introduces the terminal device as an intermediary that independently measures and reports CSI based on pre-configured resources from multiple base stations. This intermediary role allows the terminal to capture accurate channel state information including interference conditions without requiring direct communication between base stations, thus maintaining measurement accuracy while avoiding transmission delay.
3Adaptability or versatility
If multiple CSI-IM resources are configured for different transmission mechanisms, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing CSI-IM resources into distinct pre-configured groups, each associated with specific transmission mechanisms (single-station or multi-station). The terminal device is configured with multiple CSI-IM resource sets, where each set corresponds to a particular transmission scenario. This segmentation allows the system to adapt to different transmission mechanisms while maintaining clear, organized resource management that reduces operational complexity.
Data Source
AI summary
This application provides a channel state information reporting method and apparatus. The method includes: A terminal device receives M pieces of downlink control information, where first downlink control information in the M pieces of downlink control information indicates a first channel state information configuration, the first channel state information configuration is associated with a first channel state information interference measurement CSI-IM resource group, and the first CSI-IM resource group includes N1 CSI-IM resources, where M and N1 are positive integers, and N1 is greater than 1; and the terminal device measures a target CSI-IM resource, and reports channel state information, where the target CSI-IM resource is determined by the terminal device from the N1 CSI-IM resources based on M, and a quantity of target CSI-IM resources is less than N1.