PDSCH TCI State Mapping for Multi-TRP QCL Determination
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Solution Overview
Problem
In future radio communication systems like NR, proper determination of Quasi-Co-Location (QCL) parameters for multi-panel/TRP is not considered, leading to potential degradation in system performance such as decreased throughput.
Innovation Solution
A terminal with a receiving section that processes Downlink Control Information (DCI) for scheduling two Physical Downlink Shared Channels (PDSCHs) and maps two TCI state IDs to these channels, enabling proper determination of QCL parameters for multi-panel/TRP scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-panel/TRP transmission is implemented without proper QCL parameter determination, then system capacity and data rates are improved, but system performance degrades due to incorrect QCL parameter configuration
Solution Approach 1:
The patent segments the QCL parameter configuration by introducing separate TCI state IDs for different PDSCHs. Each PDSCH can be independently configured with appropriate TCI states, allowing multi-panel/TRP transmission to be divided into distinct transmission paths with dedicated QCL parameters, thus resolving the conflict between implementing multi-panel functionality and maintaining reliable QCL configuration.
2Productivity
If one DCI schedules two PDSCHs with different TCI states, then transmission efficiency is improved, but complexity increases in mapping TCI state IDs to PDSCHs
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states and establishing a predetermined mapping relationship between TCI state IDs and PDSCHs before transmission occurs. This allows the terminal to efficiently map TCI states to scheduled PDSCHs without real-time complex processing, thus improving transmission efficiency while controlling complexity through pre-established rules.
Data Source
AI summary
A terminal according to one aspect of the present disclosure has a receiving section that receives one Downlink Control Information (DCI) for scheduling two Physical Downlink Shared Channels (PDSCHs), and a control section that maps two TCI state IDs associated with a certain codepoint to the two PDSCHs respectively, when the certain a codepoint of Transmission Configuration Indication (TCI) field is used in reception of the two PDSCHs. According to one aspect of the disclosure, it is possible to properly determine QCL parameters for multi-panel/TRP.