MAC CE TRP Identifier for TCI State Activation
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Solution Overview
Problem
In 5G mobile communication systems, terminal devices cannot determine which transmission configuration indicator (TCI) state is activated or deactivated by a medium access control (MAC) control element (CE) due to simultaneous transmission from multiple transmission/reception points (TRPs), leading to unclear signal management.
Innovation Solution
The method involves obtaining or sending first information to determine the specific TRP corresponding to the MAC CE, allowing the terminal device to activate or deactivate the TCI state accurately, thereby clarifying which TRP's TCI state is affected by the MAC CE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple TRPs simultaneously transmit downlink data to terminal device using multiple beam transmission, then signal coverage is improved, but terminal device cannot determine which TCI state corresponding to the TRP the MAC CE activates or deactivates
Solution Approach 1:
The patent segments the MAC CE by introducing a TRP identifier field that divides the control element into distinct parts: one part identifies the specific TRP, and another part indicates the TCI state activation/deactivation. This segmentation allows the terminal device to correctly associate the MAC CE with the corresponding TRP's TCI state, resolving the ambiguity caused by simultaneous transmissions from multiple TRPs while maintaining improved signal coverage.
2Adaptability or versatility
If network device activates or deactivates TCI state through MAC CE in multiple beam transmission scheme, then transmission flexibility is improved, but terminal device cannot determine which TCI state corresponding to the TRP is activated or deactivated
Solution Approach 1:
The patent introduces a TRP identifier as an intermediary element within the MAC CE structure. This intermediary explicitly links the TCI state activation/deactivation command to the specific TRP, enabling the terminal device to correctly interpret the network device's intent while maintaining the transmission flexibility provided by multiple beam transmission schemes.
Data Source
AI summary
Embodiments of the application provides a method for activating or deactivating a TCI state. The method includes steps as follows. First information is obtained. The first information is used to determine at least one TRP corresponding to a MAC CE. A TCI state corresponding to the at least one TRP is activated or deactivated according to the MAC CE. The first information indicates the TRP corresponding to the MAC CE, thereby solving the problem that terminal device cannot determine which TCI state corresponding to the TRP is activated or deactivated after receiving the MAC CE.