Implicit Beam Switching for Multi-TRP 5G Signaling Overhead
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Solution Overview
Problem
Current wireless communication systems, such as 5G NR, face challenges in reducing latency and improving communication efficiency due to the need for explicit signaling for beam switching, which increases signaling overhead and latency.
Innovation Solution
The implementation of implicit beam switching and updating of transmission configuration indicator (TCI) states at both user equipment (UE) and base stations, allowing for beam switching based on channel state information (CSI) reports without explicit DCI or MAC-CE signaling, enabling reduced signaling overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit signaling (DCI or MAC-CE) is used for beam switching, then beam switching can be performed, but signaling overhead and latency increase
Solution Approach 1:
The UE performs beam switching before receiving explicit confirmation from the base station. The UE measures reference signals, determines the best beam, and switches to it proactively based on configured criteria, rather than waiting for explicit signaling. This preliminary action reduces latency while maintaining reliability through pre-configured rules and subsequent confirmation mechanisms.
Solution Approach 2:
The UE autonomously performs beam switching based on its own measurements of reference signals and pre-configured criteria from the base station. The UE self-determines when switching is needed, selects the appropriate beam, and executes the switch without requiring explicit base station commands for each switching event, thereby reducing signaling overhead and latency.
2Reliability
If explicit signaling (DCI or MAC-CE) is used for beam switching, then beam switching can be performed, but signaling overhead increases
Solution Approach 1:
The patent extracts the beam switching decision-making function from the base station and relocates it to the UE. By taking out the autonomous decision capability from the network side and placing it at the user equipment side, the system eliminates the need for continuous explicit signaling commands, thereby reducing signaling overhead while maintaining reliable beam switching through UE-based autonomous operation.
3Loss of time
If implicit beam switching is implemented, then signaling overhead and latency are reduced, but the system must handle multiple TRPs correctly
Solution Approach 1:
The patent segments the beam management process by associating different reference signals with different TRPs and configuring separate beam switching criteria for each TRP. The UE measures reference signals from multiple TRPs independently and applies segment-specific switching rules, allowing implicit beam switching to work correctly in m-TRP architectures by dividing the complex multi-TRP beam management into manageable TRP-specific segments.
Data Source
AI summary
An apparatus is provided that may be configured to transmit, to a base station having multiple TRPs, a CSI report based on a set of reference signals, the set of reference signals including a first reference signal associated with a first beam direction and a second reference signal associated with a second beam direction. The apparatus may further be configured to switch, for one or more channels, to use the first beam direction with a first TRP of the multiple TRPs before an indication to switch beams is received from the base station.