PDCCH Transmission with Multiple TRPs and CORESET Partitioning
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multi-connection configurations, particularly in non-coherent joint transmission (NCJT) scenarios where user equipment (UE) needs to coordinate with multiple transmission points (TRPs) for accurate channel state information (CSI) reporting and PDCCH transmission, leading to complexities in interference management and resource allocation.
Innovation Solution
The solution involves UE determining receiving spatial filter information for NCJT by measuring channel and interference measurement resources from multiple TRPs, configuring PDCCH with multiple TCI-states, and partitioning control resource sets (CORESET) to manage interference and resource allocation effectively, allowing for simultaneous reception and transmission with multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE coordinates with multiple transmission points for NCJT, then spectral efficiency and data rate are improved, but device complexity and interference management become more difficult
Solution Approach 1:
The patent segments the control resource set (CORESET) into multiple groups, where each CCE group is associated with a specific TCI state and transmission point. This segmentation allows the UE to independently manage and measure resources from different TRPs, reducing the overall complexity of multi-connection coordination while maintaining high spectral efficiency through parallel processing of multiple connections.
2Measurement precision
If the UE measures channel and interference resources from multiple TRPs, then CSI accuracy is improved, but measurement and interference management complexity increases
Solution Approach 1:
The patent applies local quality by associating each CCE group with a specific TCI state that corresponds to a particular transmission point's characteristics. This allows the UE to perform localized measurements and interference management for each TRP independently, improving CSI accuracy for each connection while simplifying the overall measurement process through structured organization.
3Productivity
If multiple CCE groups are transmitted from different TRPs, then resource allocation efficiency is improved, but PDCCH configuration complexity increases
Solution Approach 1:
The patent introduces dynamic TCI state indication through MAC CE signaling, allowing the network to flexibly configure and switch between different TCI states for different CCE groups. This dynamic configuration enables efficient resource allocation across multiple TRPs while managing PDCCH configuration complexity through standardized signaling procedures and automated state management.
Data Source
AI summary
In one novel aspect, multiple TRPs information are provided for REG bundle configuration with PDCCH transmission and reception with multiple transmission points (TRPs). The UE configures a PDCCH associated with a CORESET comprising multiple CCEs, partitions the CORESET into multiple CCE groups associated with corresponding TCI-state, which corresponds to a source TRP, configures multiple resource element group (REG) bundles each with multiple resource elements (REs), and assumes the same precoder applied on PDCCH DMRS when the REs are in the same REG bundle and are associated with the same source TRP, and wherein each source TRP transmits corresponding portion of DCI data mapping to the corresponding first and second CCE group. In one embodiment, the REG bundles are predefined with each comprises only REs associated with the same source TRP. In another embodiment, each CCE group corresponding to a source TRP is indicated for the REG bundle configurations.