Multi-TRP Downlink Reception Using Unified TCI States
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Solution Overview
Problem
Existing downlink communication systems face challenges in improving communication performance when multiple Transmission and Reception Points (TRPs) are used simultaneously, particularly due to issues with configuring and utilizing Channel Measurement Resources (CMRs) and Transmission Configuration Indication (TCI) states.
Innovation Solution
The method involves configuring a CMR with multiple Non-Zero Power Channel State Information Reference Signal (NZP CSI-RS) resources and determining multiple unified TCI states for receiving downlink channels or reference signals, allowing terminals to perform CSI feedback and receive PDSCH and DMRS effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple NZP CSI-RS resources are configured in CMR for multi-TRP operation, then downlink communication performance is improved, but system complexity increases
Solution Approach 1:
The patent segments the channel measurement resources by configuring multiple NZP CSI-RS resources within a single CMR, where each resource corresponds to a specific TRP. This segmentation allows the terminal to independently measure and feedback CSI for each TRP, improving downlink communication performance through multi-TRP operation while managing system complexity through structured resource division
Solution Approach 2:
The patent applies universality by using a unified TCI state framework that can simultaneously indicate multiple TRPs. The unified TCI state mechanism serves multiple functions: it configures spatial parameters for multiple TRPs, enables multi-TRP PDSCH reception, and provides a standardized interface for terminal implementation, thereby improving performance without proportionally increasing complexity
2Measurement precision
If multiple unified TCI states are used for PDSCH reception, then signal reception quality is improved, but processing complexity at the terminal increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple unified TCI states at the terminal before actual PDSCH reception. The network configures the TCI state IDs and associated spatial parameters in advance through RRC signaling, so that when multi-TRP PDSCH reception is needed, the terminal can directly utilize the pre-prepared TCI states without complex real-time processing, thus improving signal reception quality while limiting terminal processing complexity
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting and activating specific TCI states from the pre-configured set based on current channel conditions and network requirements. The network can indicate which TCI states to use through MAC CE or DCI signaling, allowing the terminal to adjust its reception parameters without reconfiguring the entire system, thereby improving reception quality with minimal processing overhead
Data Source
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AI summary
The present disclosure relates to a downlink communication method, apparatus and device, and a storage medium. The downlink communication method comprises: receiving first information, wherein the first information is used for configuring a channel measurement resource (CMR), and the CMR comprises N non-zero power channel state information reference signal (NZP CSI-RS) resources, N being a positive integer greater than 1; determining unified transmission configuration indication (TCI) states, which correspond to physical downlink shared channels (PDSCHs) and/or demodulation reference signals (DMRSs) corresponding to the PDSCHs, to be M sets of unified TCI states, M being a positive integer greater than 1, and M being less than or equal to N; and using the M sets of unified TCI states to receive the PDSCHs and/or the DMRSs corresponding to the PDSCHs. In the present disclosure, the number of NZP CSI-RS resources comprised in one channel measurement resource is configured to be multiple, and it is determined that a plurality of sets of unified TCI states are used to receive downlink channels or reference signals, thereby improving the communication performance of a downlink.