TCI State Mapping for Periodic CSI-RS Reporting After Beam Switch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current communication systems face challenges in performing periodic CSI-RS reporting after a TCI state change due to the lack of suitable CSI-RS resources for measurements, as existing specifications do not allow periodic CSI-RS resources to follow UE-specific indicated TCI states, leading to inefficient beam management and reporting.
Innovation Solution
The proposed solution involves maintaining a mapping between TCI states and periodic CSI-RS resources, allowing for dynamic switching of CSI-RS resources to match the new TCI state, enabling measurements and reporting to be performed on new resources that share the same QCL assumptions as the indicated TCI state, using methods such as preconfigured mappings or explicit resource identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If periodic CSI-RS resources are not allowed to follow UE-specific indicated TCI states, then system complexity is reduced and specifications are simpler, but beam management efficiency deteriorates and reporting accuracy is lost
Solution Approach 1:
The patent segments the TCI state application by creating separate handling mechanisms for periodic CSI-RS resources versus other resources. The network configures specific TCI states for periodic CSI-RS that are independent of dynamic UE-specific TCI indications, while other resources can follow UE-specific indications. This segmentation resolves the contradiction by simplifying the periodic CSI-RS path while enabling efficient beam management through dedicated TCI state configurations.
Solution Approach 2:
The network performs preliminary configuration of TCI states for periodic CSI-RS resources before UE-specific TCI state changes occur. By pre-configuring the mapping between periodic CSI-RS resources and specific TCI states, the system avoids the complexity of dynamic reconfiguration while ensuring that beam management remains efficient through appropriate pre-selected TCI states that match the periodic reporting requirements.
2Measurement precision
If periodic CSI-RS resources follow dynamic TCI state changes, then beam management accuracy is improved, but system complexity and specification complexity increase
Solution Approach 1:
The patent applies local quality by treating periodic CSI-RS resources differently from other resources in terms of TCI state application. Instead of applying a uniform dynamic TCI state change mechanism to all resources, the system applies specific quality characteristics to periodic CSI-RS resources by configuring dedicated TCI states that are optimized for periodic reporting, thereby achieving reporting accuracy without imposing dynamic reconfiguration complexity on the entire system.
3Device complexity
If TCI state switching is performed without preconfigured mappings, then device complexity is reduced, but measurement timing and reporting accuracy deteriorate
Solution Approach 1:
The network performs preliminary configuration of mappings between periodic CSI-RS resources and TCI states before measurement and reporting operations occur. This pre-configuration establishes the resource-TCI state associations in advance, eliminating the need for complex runtime mapping decisions at the UE while ensuring that measurements are performed on the correct resources with appropriate TCI states, thereby preserving measurement timing accuracy without increasing device complexity.
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
There is provided an apparatus, method, and computer program for causing the apparatus to perform: obtaining, from a network access node, downlink control information comprising an indication to switch from an old transmission configuration indicator, TCI, state to a new TCI state, wherein the new TCI state comprises a configuration identifying at least one new channel state information, CSI, reference signal resource(s) for periodic CSI reference signal reporting.