TCI State Signaling for Faster Beam Switching in Wireless Links
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently updating Transmission Configuration Indication (TCI) states due to long delays in applying new TCI states, particularly when the state is unknown, leading to suboptimal beam switching and increased latency.
Innovation Solution
The proposed solution involves determining a list of reference signals before receiving a first MAC-CE, allowing the application of a new TCI state without waiting for the transmission of corresponding reference signals, and utilizing various methods to update the list based on UE capabilities and network signaling, thereby reducing the delay in applying the new TCI state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system waits for the transmission of corresponding reference signals before applying a new TCI state, then the accuracy of beam configuration is improved, but the latency in applying the new TCI state increases
Solution Approach 1:
The system determines a list of reference signals associated with TCI states before receiving the MAC-CE signaling. When a new TCI state is indicated, the UE can immediately apply it if the corresponding reference signal is already in the predetermined list, eliminating the need to wait for reference signal transmission. This preliminary preparation of the reference signal list enables faster TCI state application while maintaining configuration accuracy.
2Speed
If the system uses a predetermined list of reference signals, then the beam switching speed is improved, but the complexity of list management increases
Solution Approach 1:
The reference signal list is determined in advance, before receiving TCI state update signaling. This allows the UE to quickly match indicated TCI states with pre-known reference signals, achieving fast beam switching. The list is maintained and updated through standardized procedures defined in the patent, balancing speed improvement with manageable complexity.
Solution Approach 2:
The system incorporates mechanisms to update the predetermined reference signal list based on network signaling and UE capabilities. The network can provide indications to add or remove reference signals from the list, and the UE provides feedback through channel status information reporting. This feedback mechanism ensures the list remains current while maintaining the speed benefits of predetermined lists.
Data Source
AI summary
A wireless communication method is described. The method is performed by a user device and comprises: determining a list of one or more reference signals; receiving, during a first time unit, a first signaling that includes a state; determining a relationship between a reference signal corresponding to the state and the list; and determining, based on the relationship, a second time unit associated with the state or the first signaling.