UE Beam Switching Error Handling in Wireless Systems
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling UE-initiated beam switching, particularly in managing beam changes, error handling, and ensuring synchronization between the UE and the network.
Innovation Solution
The proposed solution involves methods and apparatuses for UE-initiated beam switching, including triggering beam switching, transmitting beam switching indications, and performing error handling such as canceling triggered beam switching procedures, retransmitting indications, and applying beam failure recovery mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE initiates beam switching autonomously based on measurement, then the beam switching speed is improved, but the synchronization between UE and network deteriorates
Solution Approach 1:
The network provides feedback through beam change indications to confirm or correct UE-initiated beam switching decisions. The UE monitors downlink reference signals and compares them with expected beam configurations, generating feedback when discrepancies are detected. This feedback mechanism ensures synchronization while maintaining fast autonomous switching capability.
Solution Approach 2:
The UE performs preliminary beam measurements and evaluations before initiating beam switching, preparing candidate beam configurations in advance. The network pre-configures multiple beam options and their associated reference signals, allowing the UE to quickly switch between pre-evaluated beams without requiring extensive real-time coordination during the actual switching event.
2Reliability
If the UE retransmits beam switching indications upon failure, then the reliability of beam switching is improved, but the communication latency increases
Solution Approach 1:
The UE implements periodic beam switching attempts with exponentially increasing intervals between retries. Instead of continuous retransmission, the system uses a timed periodic approach where the UE attempts beam switching at predetermined intervals, reducing unnecessary retransmissions while ensuring eventual delivery. The periodic action allows the system to balance reliability with latency by stopping retries after a configured maximum number of attempts.
Data Source
AI summary
Methods, systems, and apparatuses are provided for handling User Equipment (UE)-initiated beam change in a wireless communication system, with a method of a UE comprising triggering or initiating a UE-initiated beam switching associated with a Cell, transmitting a beam switching indication associated with the Cell in response to the UE-initiated beam switching, and performing, in response to considering the UE-initiated beam switching to be not successful, or expiration of a timer, at least one of: canceling the triggered UE-initiated beam switching associated with the Cell, and/or canceling a Scheduling Request (SR) associated with the UE-initiated beam switching, and/or stopping a Random Access (RA) procedure associated with the UE-initiated beam switching, and/or triggering a Beam Failure Recovery (BFR) associated with the Cell, and/or retransmitting the beam switching indication, and/or generating and transmitting a second beam switching indication.