Base Station CSI-RS Muting for Channel Estimation Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In next-generation mobile communication systems, channel quality estimation using CSI-RS is affected by interference from neighboring cells, leading to inaccuracies due to varying transmission cycles of CSI-RS subframes, which complicates accurate channel quality measurement.
Innovation Solution
A base station apparatus allocates CSI-RS resources, sets muting resources in neighboring cells, and reports transmission interval information to ensure synchronized CSI-RS transmission timing across cells, allowing mobile terminals to perform accurate channel estimation by focusing on subframes with matching transmission intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CSI-RS transmission cycles are varied across different cells to increase system flexibility, then adaptability is improved, but channel quality estimation accuracy deteriorates due to interference from neighboring cells
Solution Approach 1:
The patent converts the harmful interference from neighboring cells into a beneficial synchronization mechanism. By having neighboring cells mute their CSI-RS transmissions in subframes where the serving cell transmits CSI-RS, the interference is eliminated and channel quality estimation accuracy is improved, while still allowing different transmission cycles across cells
Solution Approach 2:
The base station performs preliminary actions by determining the transmission cycles of neighboring cells before configuring CSI-RS transmission. This allows the system to pre-identify subframes where interference may occur and set up muting patterns in advance, ensuring accurate channel quality measurement without real-time interference management
2Measurement precision
If muting resources are set in neighboring cells to reduce interference, then channel quality estimation accuracy is improved, but device complexity increases due to coordination requirements
Solution Approach 1:
Each base station autonomously determines its own CSI-RS transmission cycle and identifies potential interference from neighboring cells based on received transmission cycle information. The system performs self-service by automatically configuring muting resources without requiring complex centralized coordination, reducing device complexity while maintaining measurement precision
Data Source
AI summary
The present invention provides a base station apparatus, a mobile terminal apparatus and a communication control method which can improve the accuracy of channel quality estimation. A communication control method includes the steps of: arranging a CSI-RS, which is a reference signal for downlink channel estimation, in resources of subframes for CSI-RS transmission; setting, in the subframes for CSI-RS transmission, resources to which the CSI-RS is allocated in neighboring areas, to be muting resources; and reporting transmission interval information, which indicates a transmission interval of subframes that are set at the same timing in a transmission cycle of a subframe for CSI-RS transmission in a subject area and in a transmission cycle of a subframe for CSI-RS transmission in the neighboring areas, to a mobile terminal apparatus.