Coherent Multi-TRP CSI Codebooks for Selective PMI Reporting
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately transmitting and receiving signals while maintaining battery life in user equipment devices, particularly in multi-transmission-reception-point operations, where CSI reporting is inefficient and power-consuming.
Innovation Solution
Implementing CSI configuration information to restrict PMI reporting by user equipment devices, including codebook subset restriction and rank restriction, to optimize channel state information reporting for coherent joint transmission in multi-TRP scenarios, reducing power consumption and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI reporting is performed without restrictions in multi-TRP operations, then channel state information accuracy is improved, but power consumption increases
Solution Approach 1:
The patent extracts and removes unnecessary or redundant PMI reporting elements from the CSI reporting process. By identifying and eliminating redundant precoding matrix indicators that do not contribute to channel state accuracy, the system reduces the processing load and power consumption while maintaining essential measurement precision for multi-TRP operations.
Solution Approach 2:
The patent applies partial action by reporting only the necessary subset of PMI information rather than complete exhaustive reporting. The UE selectively reports precoding matrix indicators based on configuration parameters, providing sufficient channel state information for coherent joint transmission without the excessive power consumption of full CSI reporting for all possible TRP combinations.
2Reliability
If unrestricted PMI reporting is performed for multiple TRPs, then transmission accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the PMI reporting process into distinct, manageable components. By dividing the precoding matrix indicator reporting into separate reportable elements corresponding to different TRPs and beam pairs, the system maintains transmission accuracy through comprehensive coverage while reducing overall reporting complexity through structured organization and selective reporting based on configuration.
Solution Approach 2:
The patent applies local quality by configuring different reporting requirements for different TRPs and spatial locations. The gNB can specify which TRPs require detailed PMI reporting and which can use simplified reporting, allowing transmission accuracy to be maintained for critical TRPs while reducing complexity for others based on their specific operational requirements.
3Measurement precision
If full CSI reporting is performed for coherent joint transmission, then signal accuracy is improved, but battery life decreases
Solution Approach 1:
The patent applies preliminary action by having the gNB configure the UE with specific CSI reporting parameters and restrictions before the actual CSI reporting occurs. This pre-configuration allows the UE to prepare only the necessary PMI reports in advance, avoiding full exhaustive reporting and thereby reducing power consumption while maintaining signal accuracy through targeted pre-planned reporting strategies.
Data Source
AI summary
Devices and methods for providing channel state information reporting for multi-transmission-reception-point coherent joint transmission in a wireless communication system. Channel state information configuration information is provided by a base station to a wireless device. The channel state information configuration information indicates one or more restrictions for the UE in reporting a precoding matrix indicator (PMI) for each of multiple transmission reception points. The wireless device provides a PMI to the base station based on the channel state information configuration information.