PDSCH Reception Using Indexed TCI States in Multi-TRP Downlink
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing downlink signal reception in control channels, particularly in scenarios involving multiple transmission/reception points (TRPs) and multiple antenna panels, leading to suboptimal performance and reliability.
Innovation Solution
A method for a wireless device to receive RRC messages configuring multiple TCI states, apply specific TCI states to PDSCH reception based on index values, and utilize DCI for scheduling, enhancing downlink control information handling to improve signal reception reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TCI states are configured for PDSCH reception in multi-TRP scenarios, then downlink signal reception reliability is improved, but device complexity and configuration management difficulty increase
Solution Approach 1:
The patent segments the TCI state configuration by introducing separate index fields (first TCI state index and second TCI state index) for different TRPs. This allows independent configuration and management of TCI states for each transmission point, reducing the complexity of managing multiple TCI states while improving reception reliability through diverse TRP utilization.
Solution Approach 2:
The patent introduces a new dimension to TCI state management by associating TCI states with specific TRP identifiers. This dimensional separation allows the system to handle multiple TCI states without increasing management complexity, as each TCI state is clearly mapped to a specific TRP through the index mechanism.
2Adaptability or versatility
If TCI states are dynamically switched based on index values in DCI, then adaptability to different transmission scenarios is improved, but processing overhead and signaling complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states with specific index values before actual transmission. The wireless device stores these pre-configured TCI states and their corresponding indices, enabling rapid switching without complex real-time processing when DCI is received, thus reducing processing overhead while maintaining high adaptability.
Solution Approach 2:
The patent introduces index values as intermediaries between DCI and TCI states. Instead of directly managing complex TCI state parameters in DCI, the system uses simple index values that map to pre-configured TCI states, significantly reducing DCI processing complexity while preserving full adaptability to different transmission scenarios.
3Reliability
If control channel repetition is implemented across multiple TRPs, then control information reliability is improved, but resource consumption and system overhead increase
Solution Approach 1:
The patent applies local quality by enabling control channel repetition only for specific TRPs based on configuration and channel conditions. Different TRPs can have different repetition configurations, allowing the system to improve control information reliability where needed while minimizing unnecessary resource consumption in other areas.
Solution Approach 2:
The patent implements partial repetition by allowing selective activation of control channel repetition for different TRPs and different control channel types. This partial approach ensures sufficient reliability for critical control information while avoiding excessive resource consumption by not uniformly applying repetition to all control channels in all scenarios.
Data Source
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AI summary
A wireless device receives one or more radio resource control (RRC) messages comprising a transmission configuration indication (TCI) state parameter indicating a plurality of TCI states and an index with a value. A first value of the index indicates to apply a first TCI state, of at least two TCI states, to a physical downlink shared channel (PDSCH) reception. A second value of the index indicates to apply a second TCI state, of the at least two TCI states, to the PDSCH reception. The wireless device receives a control command indicating the at least two TCI states of the plurality of TCI states. The wireless device receives downlink control information (DCI) scheduling the PDSCH reception. The wireless device receives the PDSCH reception based on a TCI state, among the at least two TCI states, indicated by the value of the index.