CSI-RS Multi-TCI Configuration for Flexible Beam Management
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Solution Overview
Problem
Wireless communication networks face interference issues due to transmissions from neighbor base stations and other wireless RF transmitters, which degrade performance, especially as demand for mobile broadband access increases and more UEs access long-range and short-range systems, leading to congested networks.
Innovation Solution
The implementation of channel state information-reference signal (CSI-RS) resources with multiple transmission configuration indication (TCI) states, allowing UEs to receive and identify CSI-RS resources using quasi-co-location (QCL) assumptions based on relationships between scheduling offsets and beam switch times, enabling efficient reception and beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TCI states are associated with a single CSI-RS resource, then beam management flexibility and interference mitigation are improved, but device complexity and configuration overhead increase
Solution Approach 1:
The patent segments the TCI state configuration by associating multiple TCI states with a single CSI-RS resource, allowing the UE to selectively apply different TCI states for different spatial beams. This segmentation enables flexible beam management while distributing the configuration complexity across multiple manageable TCI state identifiers rather than requiring separate resources for each beam configuration.
Solution Approach 2:
The patent implements multi-functionality by enabling a single CSI-RS resource to serve multiple beam management purposes through association with multiple TCI states. The same CSI-RS resource can be used for channel state information acquisition across different spatial directions and transmission configurations, eliminating the need for separate dedicated resources for each beam and reducing overall system complexity.
2Measurement precision
If QCL assumptions are applied based on scheduling offset and beam switch time relationships, then reception accuracy is improved, but processing complexity and timing requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring QCL assumptions and establishing relationships between scheduling offsets and beam switch times before actual CSI-RS reception. The UE is provided with advance information about which TCI states to apply and when, allowing it to prepare the appropriate reception parameters in advance rather than making complex real-time decisions, thereby improving reception accuracy while managing processing complexity.
3Object-affected harmful factors
If multiple TCI states are configured for CSI-RS resources, then interference mitigation capability is improved, but signaling overhead and network congestion increase
Solution Approach 1:
The patent merges multiple TCI state configurations into a single CSI-RS resource association, combining what would traditionally require separate signaling messages into one unified configuration. By allowing a single CSI-RS resource to reference multiple TCI states, the patent reduces the total number of signaling transmissions needed to convey beam management information, thereby mitigating network congestion while maintaining comprehensive interference mitigation capabilities.
Data Source
AI summary
Channel state information-reference signal (CSI-RS) resources are disclosed with multiple transmission configuration indication (TCI) states. Example aspects of the present disclosure provide for indications that a given CSI-RS resource is associated with multiple TCI states within various configuration control signaling, depending on whether the CSI-RS is periodic, semi-persistent, or aperiodic. Additionally, where any trigger state corresponds to a CSI-RS resource set in which one or more CSI-RS resources are associated with multiple TCI states, one or more quasi-co-location (QCL) assumptions of the downlink transmission may also be applied by a user equipment (UE) to reception of the CSI-RS resources, where the scheduling offset is less than the threshold beam switch timing reported by the UE.