CSI-RS Resource Sharing for Scalable Interference Measurement
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Solution Overview
Problem
In multi-base station coordinated multipoint transmission scenarios, the increase in the number of coordinated base stations leads to a surge in interference measurement hypotheses, resulting in a large number of CSI processes that are not scalable, causing excessive downlink transmission resources to be occupied.
Innovation Solution
Configuring CSI reporting configuration information and resource configuration information in a way that multiple interference measurement hypotheses share the same CSI-RS resource sets, allowing only the number of CSI-RS resource sets to increase with the number of coordinated base stations, without increasing the amount of CSI reporting configuration information or resource configuration information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of coordinated base stations is increased, then the coverage and transmission capability are improved, but the quantity of CSI processes and interference measurement hypotheses increases, causing the system to become non-scalable and occupying excessive downlink transmission resources
Solution Approach 1:
The patent merges multiple interference measurement hypotheses into a single CSI process. Instead of configuring separate CSI processes for each interference measurement hypothesis, the invention allows one CSI process to handle multiple hypotheses by sharing the same NZP CSI-RS resource for channel measurement while using different ZP CSI-RS resources to represent different interference scenarios. This consolidation directly reduces the quantity of CSI processes and resolves the scalability issue.
Solution Approach 2:
The patent makes the CSI process multi-functional by enabling it to serve multiple interference measurement hypotheses simultaneously. The single CSI process is configured to perform channel measurement using shared NZP CSI-RS resources and interference measurement using multiple ZP CSI-RS resources, allowing it to universally handle different interference scenarios without requiring separate dedicated processes for each hypothesis.
2Measurement precision
If separate CSI processes are configured for each interference measurement hypothesis, then accurate CSI measurement in different interference cases is achieved, but a large quantity of downlink transmission resources are occupied
Solution Approach 1:
The patent combines multiple interference measurement hypotheses into a single CSI process configuration, merging the channel measurement function (using shared NZP CSI-RS resources) with multiple interference measurement functions (using different ZP CSI-RS resources). This merging maintains measurement precision for each hypothesis while significantly reducing the total downlink transmission resources required compared to configuring separate CSI processes.
Solution Approach 2:
The patent discards the redundant configuration of separate CSI processes and recovers the resources by reusing the same NZP CSI-RS resource across multiple CSI processes for channel measurement. The differentiation between hypotheses is maintained through selective use of ZP CSI-RS resources for interference measurement, thereby recovering downlink transmission resources while preserving measurement accuracy.
Data Source
AI summary
Embodiments of the present disclosure include channel state information processing methods and apparatuses. One example method includes configuring, by a network device, at least one piece of CSI reporting configuration information and resource configuration information corresponding to the CSI reporting configuration information, where one piece of the CSI reporting configuration information corresponds to at least two pieces of resource configuration information, wherein one resource configuration information is used for interference measurement and includes a CSI-RS resource set, wherein one resource configuration information is used for channel measurement and includes a NZP CSI-RS resource, and wherein one CSI-RS resource set corresponds to at least one CSI report. The at least one piece of CSI reporting configuration information and the resource configuration information is sent to a terminal device.