Terminal PDCCH Configuration for Multi-TRP Spatial Diversity
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Solution Overview
Problem
Current Next-Generation Mobile Communication Systems, specifically 5G NR, face challenges in achieving spatial diversity gain and high rank transmission when multiple panels/TRPs are used, leading to suppressed communication throughput due to limitations in designating transmission configuration indication states for Physical Downlink Control Channels (PDCCHs).
Innovation Solution
A terminal and radio communication method that includes a receiving section for PDCCH configuration with a maximum number of control resource sets exceeding 3, and a control section that designates the transmission configuration indication state based on Medium Access Control Control Elements (MAC CEs), allowing for appropriate TCI state designation even with multiple panels/TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple panels/TRPs are used for DL transmission, then spatial diversity gain and high rank transmission can be achieved, but the existing NR specifications cannot appropriately designate TCI state for each PDCCH, leading to suppressed communication throughput
Solution Approach 1:
The patent segments the TCI state designation by introducing separate TCI state fields for each CORESET (first CORESET TCI state and second CORESET TCI state). This allows independent configuration of TCI states for different PDCCH receptions from multiple TRPs, enabling spatial diversity while maintaining throughput through proper beam management.
2Adaptability or versatility
If the maximum number of CORESETs is increased to support multi-PDCCH-based multi-TRP transmission, then more TCI states can be configured, but the existing MAC CE mechanism is insufficient for appropriate TCI state designation
Solution Approach 1:
The patent introduces MAC CE as an intermediary mechanism to efficiently manage TCI state designation. The MAC CE message structure includes fields for indicating TCI states for multiple CORESETs, providing a standardized and systematic approach to handle the increased complexity of multi-TRP TCI state management without requiring complex higher-layer signaling.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a Physical Downlink Control Channel (PDCCH) configuration with a maximum number of control resource sets (CORESETs) exceeding 3, and a control section that assumes that a transmission configuration indication state (TCI state) for a PDCCH with respect to the CORESETs is designated on the basis of a Medium Access Control Control Element (MAC CE). According to one aspect of the present disclosure, it is possible to perform DL communication preferably even when multiple panels/TRPs are used.