CSI Calculation Using Antenna Port Subsets for Spatial Adaptation
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Solution Overview
Problem
Existing CSI calculation methods do not effectively address the need for efficient spatial adaptation in 5G networks, leading to increased energy consumption and resource overhead due to UE-specific CSI-RS configurations, which are not optimized for different spatial adaptation patterns.
Innovation Solution
A method where a UE forms a hypothetical PDSCH by assuming antenna port restrictions based on CSI-RS antenna port subsets for enhanced CSI calculation, enabling accurate CSI reporting and spatial adaptation considering multiple sub-configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE-specific CSI-RS configurations are used for spatial adaptation, then spatial adaptation capability is improved, but energy consumption and resource overhead increase
Solution Approach 1:
The patent segments the CSI-RS configuration into multiple sub-configurations, each associated with different antenna port subsets. This allows the UE to calculate CSI for specific spatial adaptation patterns independently, enabling efficient spatial adaptation without requiring full UE-specific configurations for all patterns, thereby reducing overall energy consumption.
Solution Approach 2:
The patent applies partial action by having the UE calculate CSI quantities only for the necessary antenna port subsets corresponding to active spatial adaptation patterns, rather than performing complete CSI calculations for all possible configurations. This reduces computational energy consumption while maintaining adequate spatial adaptation capability.
2Adaptability or versatility
If UE-specific CSI-RS configurations are used for spatial adaptation, then spatial adaptation capability is improved, but resource overhead increases
Solution Approach 1:
The patent divides the CSI-RS configuration into multiple sub-configurations, each linked to specific antenna port subsets. This segmentation allows the network to allocate resources more efficiently by only configuring CSI-RS for the antenna ports needed for current spatial adaptation patterns, reducing overall resource overhead while maintaining spatial adaptation capability.
Solution Approach 2:
The patent makes the CSI-RS configuration universal by allowing a single configuration to serve multiple spatial adaptation patterns through sub-configurations. The same CSI-RS resources can be reused across different spatial patterns, eliminating the need for separate UE-specific configurations for each pattern and reducing resource overhead.
3Measurement precision
If hypothetical PDSCH is formed with antenna port restrictions, then CSI calculation accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the mapping relationships between CSI-RS antenna ports and PDSCH antenna ports before CSI calculation. The network configures sub-configurations that specify which CSI-RS ports correspond to which PDSCH ports, allowing the UE to perform simpler substitutions during CSI calculation rather than performing complex real-time analysis, thus maintaining accuracy while reducing computational complexity.
Data Source
AI summary
A method includes: receiving, from a network, a channel state information report configuration including one or more sub-configurations, wherein a sub-configuration of the one or more sub-configurations is associated with at least one channel state information reference signal antenna port subset; determining, for a calculation of one or more channel state information quantities for the sub-configuration corresponding to or indicating the at least one channel state information reference signal antenna port subset, a hypothetical physical downlink shared channel by considering an antenna port restriction based on the at least one channel state information reference signal antenna port subset the sub-configuration corresponds to or indicates; and calculating the one or more channel state information quantities for the sub-configuration, based on the formed hypothetical physical downlink shared channel.