TCI State Switching Order for Adjacent SSB Synchronization
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Solution Overview
Problem
User Equipment (UE) faces challenges in synchronizing with overlapping or adjacent Synchronization Signal/BCH Blocks (SSBs) due to receiving signals from different directions, leading to panel switching delays and inadequate time-frequency tracking when multiple Transmission Configuration Indicator (TCI) states are activated.
Innovation Solution
A method and apparatus for determining an order of switching between adjacent TCI states, allowing for coordinated panel switching and synchronization with SSBs by indicating the order of transitions between source and target TCI states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TCI states are activated for receiving SSBs from different directions, then the UE can receive signals from multiple panels, but the UE cannot perform simultaneous T/F tracking for each SSB due to panel switching requirements
Solution Approach 1:
The network device performs preliminary action by determining and signaling the switching order of TCI states before the UE needs to perform panel switching. The first indication information specifies the order in which the UE should switch between TCI states, allowing the UE to prepare and execute panel switching in advance without waiting for real-time instructions, thereby reducing panel switching delay while maintaining the ability to receive SSBs from multiple directions
2Reliability
If the UE switches panels to synchronize with overlapping or adjacent SSBs, then the UE can maintain synchronization, but the UE cannot complete synchronization within the same time period
Solution Approach 1:
The network device determines the optimal switching order of TCI states in advance and signals this to the UE through first indication information. This preliminary determination allows the UE to execute panel switching in the correct sequence without waiting for real-time feedback, enabling the UE to complete synchronization with multiple overlapping or adjacent SSBs within the available time period while maintaining reliable synchronization
3Productivity
If the UE processes multiple TCI states simultaneously, then the UE can improve processing efficiency, but the UE cannot perform T/F tracking for each SSB accurately
Solution Approach 1:
The network device performs preliminary action by determining the correct switching order of TCI states and signaling this to the UE. This allows the UE to process TCI states in an optimized sequence that balances processing efficiency with accurate T/F tracking. By following the pre-determined order, the UE can efficiently process multiple TCI states while maintaining precise T/F tracking for each SSB, as the switching order is specifically designed to accommodate the time-frequency characteristics of each SSB
Data Source
AI summary
Example embodiments of the disclosure relate to methods, apparatuses, and a computer readable storage medium for dynamic transmission configuration indicator (TCI) activation. In a method, a first apparatus receives a first indication and a second indication. The first indication indicates a first switch from a first TCI state to a first target TCI state is to be performed, and the second indication indicates a second switch from a second source TCI state to a second target TCI state is to be performed. The first source TCI state has been activated for a first network device, and the second source TCI state has been activated for a second network device. Reference signals associated with the first target TCI state and the second target TCI state are adjacent. The first apparatus determines an order for performing the first switch and the second switch.