TCI State Switching Order for Overlapping 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, considering information from network devices to facilitate synchronized panel switching and reduce synchronization delays.
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 patent applies preliminary action by determining the switching order between different TCI states before the UE actually needs to switch panels. The network device determines which TCI state should be switched first based on predicted performance metrics, and this order is communicated to the UE in advance. This allows the UE to prepare for panel switching in a planned manner rather than reacting to timing issues during SSB reception, thereby reducing unnecessary delays while maintaining the ability to receive from multiple directions.
2Measurement precision
If the UE waits for additional SSB periodicity to synchronize with overlapping SSBs, then the UE can measure all SSBs, but the synchronization process is delayed
Solution Approach 1:
The patent implements feedback by having the network device monitor actual measurement performance metrics (such as measurement accuracy, signal quality, or processing time) and use this information to dynamically adjust the TCI state switching order. The network device receives feedback about which switching sequence enables the UE to successfully measure all SSBs with the least delay, and this feedback loop continues to optimize the switching order in real-time conditions, balancing measurement completeness with synchronization speed.
3Reliability
If the UE performs T/F tracking for each SSB independently, then the UE can synchronize with each panel, but the UE cannot do so simultaneously when SSBs are overlapping or adjacent
Solution Approach 1:
The patent applies dynamics by making the TCI state switching order adaptive rather than fixed. The network device dynamically determines the optimal switching sequence based on real-time conditions such as SSB timing, panel capabilities, and current signal conditions. This dynamic adjustment allows the system to optimize synchronization speed for each specific scenario while maintaining reliability, rather than using a static approach that would work for some cases but create delays in others.
Data Source
AI summary
Example embodiments of the disclosure relate to methods, apparatuses, and a computer readable storage medium for transmission configuration indicator (TCI) activation. In a method, a first apparatus receives a first indication indicating a first switch from a first source TCI state to a first target TCI state is to be performed, and a second indication indicating a second switch from a second source TCI state to a second target TCI state is to be performed. The first apparatus determines an order for performing the first switch and the second switch, the order being associated with at least one of first information about a first transmission between the first network device and the first apparatus or second information about a second transmission between the second network device and the first apparatus.