Reduced TCI State Management for Multi-TRP Coherent Joint Transmission
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing a large number of TCI states for coherent joint transmission (CJT) from multiple transmission/reception points (TRPs), leading to increased processing burden and signaling overhead for user equipment (UEs).
Innovation Solution
The UE configures and derives a reduced number of TCI states based on a maximum supported number, receiving indications from network nodes for channel estimation, thereby reducing the processing load and signaling requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE is configured to support coherent joint transmission from multiple TRPs with a large number of TCI states, then the transmission reliability and channel estimation accuracy are improved, but the processing burden and signaling overhead increase significantly
Solution Approach 1:
The patent segments the large set of TCI states into multiple groups or subsets, where each group is associated with specific TRPs or transmission scenarios. This segmentation allows the UE to process only relevant TCI state groups for each transmission, reducing the overall processing burden while maintaining reliability through selective application of appropriate TCI states for different TRPs
Solution Approach 2:
The patent implements dynamic TCI state management where the network can activate or deactivate specific TCI states based on current transmission conditions, TRP configurations, and channel states. This dynamic approach allows the system to adapt the number of active TCI states to actual needs, reducing processing burden during normal operation while maintaining reliability when required by selectively activating only necessary TCI states
2Measurement precision
If the UE is configured with a large number of TCI states for multiple TRPs, then the channel estimation accuracy is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the essential or most relevant TCI state information that is necessary for accurate channel estimation, rather than transmitting complete configurations for all TCI states. This extraction approach reduces signaling overhead by sending only critical parameters while maintaining channel estimation accuracy through selective transmission of key TCI state data
Solution Approach 2:
The patent implements preliminary configuration of TCI states where the network pre-configures a set of candidate TCI states with their associated parameters before actual transmission. This preliminary action allows the UE to have TCI state information readily available, reducing the need for extensive signaling during active transmission while maintaining channel estimation accuracy through pre-prepared TCI state configurations
Data Source
AI summary
Aspects described herein relate to a user equipment (UE) or other device receiving, based on a maximum number of transmission configuration indicator (TCI) states, an indication of one or more TCI states for coherent joint transmission (CJT) from at least a portion of multiple transmission/reception points (TRPs) that can be configured for the UE. One or more downlink reference signals can be received based on the indication and from at least the portion of the multiple TRPs, and a power delay profile (PDP) or Doppler spectrum for channel estimation for at least a portion of the one or more TCI states can be derived based on the one or more downlink reference signals. Other aspects relate to transmitting the indication of the TCI states and/or the reference signals.