Joint CSI Reporting for Multi-TRP 5G Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G and next-generation wireless communication systems with multiple transmission points, there is a mismatch between estimated channel state information (CSI) and scheduled CSI, leading to loss in throughput due to the use of minimum or mean quality indicators for joint CSI computation.
Innovation Solution
The network assigns joint channel state information reference signal (CSI-RS) antenna ports to user equipment, allowing it to compute and report joint CSI based on indicated ports, thereby avoiding the mismatch between estimated and scheduled CSI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the network uses minimum or mean quality indicators to compute joint CSI for scheduling with multiple TRPs, then the scheduling can be performed using a single PDCCH, but the estimated CSI mismatches with the scheduled CSI causing throughput loss
Solution Approach 1:
The patent introduces a feedback mechanism where the UE reports joint CSI based on actual received reference signals from multiple TRPs. The network uses this feedback to compute accurate joint CSI that reflects real channel conditions, eliminating the mismatch between estimated and scheduled CSI while maintaining single PDCCH scheduling.
Solution Approach 2:
The patent changes the parameter used for joint CSI computation from simple minimum/mean quality indicators to a more comprehensive joint CSI calculation based on actual reference signal measurements. This parameter change enables accurate representation of multi-TRP channel conditions while maintaining scheduling efficiency.
2Measurement precision
If the UE sends separate CSI reports to each TRP, then each TRP receives accurate channel state information, but the network cannot efficiently aggregate this information for unified scheduling
Solution Approach 1:
The patent merges separate CSI reports from multiple TRPs into a unified joint CSI report. The UE aggregates channel state information from all TRPs and sends a single consolidated CSI report to the network, which then uses this unified information for scheduling decisions across all TRPs.
Solution Approach 2:
The joint CSI report serves multiple functions: it provides accurate channel state information for each TRP while also enabling the network to make unified scheduling decisions across all TRPs. This multi-functional approach eliminates the need for separate aggregation processes.
Data Source
AI summary
The described technology is generally directed towards indicating to a receiver (e.g., a user equipment) which antenna ports are assigned for channel state information reference signals (CSI-RS). The indicator can be sent as radio resource control configuration data and/or by physical layer signaling such as in downlink control information. The receiver computes CSI based on the assigned antenna port or ports, and the reported (e.g., joint) CSI helps avoid mismatched joint CSI used for scheduling when multiple transmit and receive points (TRPs) are communicating with the user equipment.