CSI Feedback Configuration via Segmented RS and IM Resources
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE-A and beyond, face challenges in efficiently configuring measurements and Channel State Information (CSI) feedback, especially in supporting multiple transmission antennas and interference measurements, which leads to increased complexity and overhead.
Innovation Solution
The system configures user equipment (UE) with specific reference signal (RS) resource configurations, interference measurement (IM) resource configurations, and CSI report configurations, allowing for flexible signaling of CSI resources and measurement reports to support multiple types of signal and interference measurements, enabling improved accuracy and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple reference signal resource configurations and interference measurement resource configurations are provided to support multiple transmission antennas and interference measurements, then measurement accuracy and CSI feedback precision are improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent segments the reference signal resources and interference measurement resources into multiple distinct configurations (first RS resource configuration, second RS resource configuration, first IM resource configuration, second IM resource configuration). Each configuration can be independently selected and activated through DCI signaling, allowing the system to divide the measurement task across multiple specialized resource sets rather than using a single monolithic configuration, thereby improving measurement precision while managing complexity through modular organization.
Solution Approach 2:
The patent implements dynamic selection of RS and IM resource configurations through DCI (Downlink Control Information) signaling. The network can dynamically indicate which specific RS resource configuration and IM resource configuration to use for each scheduling decision, allowing the system to adapt measurement resources to current channel conditions and interference scenarios in real-time, improving CSI feedback precision without permanently increasing system complexity.
2Measurement precision
If multiple reference signal resource configurations and interference measurement resource configurations are provided to support multiple transmission antennas and interference measurements, then measurement accuracy and CSI feedback precision are improved, but signaling overhead increases
Solution Approach 1:
The patent creates universal resource configuration templates that can serve multiple purposes. The first and second RS resource configurations, along with first and second IM resource configurations, are designed to be universally applicable across different transmission scenarios and antenna configurations. A single set of resource configurations can support multiple transmission points, CoMP schemes, and HetNet configurations, reducing the need for separate dedicated configurations and thereby reducing signaling overhead while maintaining measurement precision.
Solution Approach 2:
The patent performs preliminary configuration of RS and IM resource configurations through higher-layer signaling (RRC signaling) before actual data transmission. These pre-configured resource templates are then referenced and activated through compact DCI signaling during scheduling. By preparing measurement resources in advance and using indirect referencing rather than direct configuration in dynamic signaling, the patent reduces the amount of signaling overhead required while ensuring measurement precision is maintained through properly pre-configured resources.
3Adaptability or versatility
If flexible signaling of CSI resources and measurement reports is implemented to support multiple types of signal and interference measurements, then adaptability and measurement accuracy are improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent applies local quality by assigning different characteristics and purposes to different RS resource configurations and IM resource configurations. The first RS resource configuration may be optimized for one type of measurement scenario while the second is optimized for another, with each having locally optimized parameters for its specific use case. This allows the UE to process each configuration with appropriate assumptions and methods tailored to its specific purpose, reducing overall processing complexity compared to handling a single universal configuration with all possible variations.
Solution Approach 2:
The patent enables partial activation of available resource configurations through DCI signaling. Instead of requiring the UE to process and maintain all possible RS and IM resource configurations simultaneously, the network activates only the specific configurations needed for current transmission and measurement requirements. The UE processes only the indicated subset of configurations, reducing processing complexity while maintaining the adaptability to switch between different measurement scenarios when needed.
Data Source
AI summary
Measurements and Channel State Information (CSI) feedback are configured using communications between a network and user equipment (UE). The communications includes a first signaling from a network component to the UE indicating one or more reference signal (RS) resource configurations, a second signaling indicating one or more interference measurement (IM) resource configurations, and a third signaling indicating a CSI report configuration, wherein the CSI report configuration indicates a subset of the one or more RS resource configurations and a subset of the one or more IM resource configurations. The UE establishes a RS based measurement according to the subset of the one or more RS resource configurations and an IM according to the subset of the one or more IM resource configurations. The UE then generates and sends to the network a CSI report in accordance with the CSI report configuration and using the RS based measurement and the IM.