CSI-RS Resource Multiplexing Across RBs and Slots
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
CSI-RS resources in 5G NR systems utilize a significant amount of overhead resources, particularly when configured for UEs with high coherence bandwidth and time, leading to inefficiencies in resource utilization for UEs with varying coherence properties.
Innovation Solution
Implementing CSI-RS resource multiplexing across frequency and time domains based on code division multiplexing (CDM) for UEs capable of utilizing such resources, while allowing flexible configuration for UEs with different coherence characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS resources are configured to span RBs across frequency domain or slots across time domain for UEs with high coherence bandwidth and time, then measurement precision is improved, but resource overhead increases
Solution Approach 1:
The system dynamically configures CSI-RS resource spanning based on UE capability indicators. UEs report their coherence bandwidth and coherence time capabilities, and the network entity configures appropriate CSI-RS spanning patterns (frequency domain, time domain, or both) accordingly. This dynamic adaptation allows UEs with high coherence properties to benefit from improved measurement precision while UEs with lower coherence properties use configurations with reduced overhead.
Solution Approach 2:
The invention changes the configuration parameters of CSI-RS resources based on UE capabilities. By adjusting whether CSI-RS spans multiple RBs in frequency domain, multiple slots in time domain, or both, the system optimizes the balance between measurement precision and resource overhead for different UE types.
2Quantity of substance
If CSI-RS resources are reduced for UEs with lower coherence bandwidth and time, then resource overhead is reduced, but measurement precision deteriorates
Solution Approach 1:
Different quality configurations of CSI-RS resources are applied to different UEs based on their local characteristics (coherence bandwidth and coherence time capabilities). UEs with high coherence properties receive full-spanning CSI-RS configurations for high precision, while UEs with lower coherence properties receive reduced-spanning configurations to minimize overhead, matching the resource quality to each UE's specific needs.
3Productivity
If CSI-RS configuration is optimized for UEs with high coherence properties, then productivity is improved, but adaptability decreases
Solution Approach 1:
The system implements a universal CSI-RS configuration mechanism that can serve multiple UE types with different coherence properties. By introducing capability reporting and conditional configuration based on UE indicators, a single flexible configuration framework achieves both optimized productivity for capable UEs and broad adaptability across all UE types.
Data Source
AI summary
A UE may be configured to receive an indication of a CSI-RS configuration. The CSI-RS configuration may be received from a network entity. The CSI-RS configuration may include at least one CSI-RS RB group associated with CDM for a set of CSI-RSs. The at least one CSI-RS RB group may correspond to at least one of a plurality of RBs in a frequency domain or a plurality of slots in a time domain. The UE may be configured to receive the set of CSI-RSs based on the CSI-RS configuration and the CDM for the set of CSI-RSs. The CDM for the set of CSI-RSs may be associated with at least one of the plurality of RBs or the plurality of slots.