User Terminal TCI State Control for Beam Failure Recovery
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Solution Overview
Problem
In future radio communication systems, the structure for switching CORESET #0 beam during beam recovery procedures is unclear, leading to challenges in controlling the Transmission Configuration Indicator (TCI) state effectively.
Innovation Solution
A user terminal is equipped with a transmitting unit to send a beam failure recovery request (BFRQ) and a control unit that assumes a TCI state corresponding to the beam for which the BFRQ has been transmitted, related to a control resource set (CORESET) for beam failure recovery, allowing appropriate control of the TCI state during the beam recovery process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam switching procedure is implemented to reduce radio link failure, then reliability is improved, but device complexity increases due to unclear CORESET beam switching structure
Solution Approach 1:
The user terminal assumes the TCI state corresponding to the beam for which the beam failure recovery request has been transmitted as a TCI state for a CORESET related to beam failure recovery before actual beam switching occurs. This preliminary assumption enables the terminal to proactively configure the CORESET TCI state based on the selected recovery beam, avoiding the complexity of real-time beam switching decisions and reducing radio link failure.
2Adaptability or versatility
If TCI state control is made flexible for beam recovery, then adaptability is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The user terminal autonomously determines and assumes the TCI state for the CORESET based on the beam selection for beam failure recovery request transmission, without requiring additional network configuration or complex measurement procedures. This self-service approach provides adaptability in TCI state control while simplifying the detection and measurement process by eliminating the need for external signaling.
Data Source
AI summary
In order to appropriately control a TCI state for a CORESET in a beam recovery procedure for future radio communication systems, one aspect of a user terminal of the present disclosure includes a transmitting unit that transmits a beam failure recovery request (BFRQ), and a control unit that makes an assumption on a transmission configuration indicator state (TCI state) corresponding to a beam for which the beam failure recovery request (BFRQ) has been transmitted, as a CORESET TCI state related to a control resource set (CORESET) for beam failure recovery (BFR).