Autonomous SCell Beam Failure Recovery via UE-Reported Preferred Beam
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Solution Overview
Problem
Wireless communication systems face inefficiencies in beam failure recovery, particularly in secondary cell (SCell) communications, leading to increased system latency or unsuccessful recovery procedures.
Innovation Solution
The implementation of autonomous transmission configuration updating methods, where a user equipment (UE) detects beam failure and autonomously transmits an indication to the primary cell (PCell), allowing for a report of a preferred beam to be sent, enabling the base station to modify its transmission configuration and recover the downlink beam, subsequently recovering the uplink beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a beam recovery procedure is initiated when the quality of a current beam used for SCell communications degrades, then communication reliability may be maintained, but system latency increases and recovery may be unsuccessful
Solution Approach 1:
The UE performs preliminary actions by autonomously selecting a candidate beam and preparing recovery configuration before the beam failure becomes critical. The UE transmits an indication of the selected candidate beam to the base station in advance, allowing the base station to pre-configure the TCI state for SCell downlink communications, thus reducing recovery latency when failure occurs.
Solution Approach 2:
The UE autonomously performs beam selection and candidate beam identification without requiring base station intervention or coordination. The UE independently monitors beam quality, selects alternative beams based on predefined criteria, and transmits selection indications to the base station, enabling self-service beam recovery that reduces system latency.
2Productivity
If the UE autonomously selects and reports a preferred beam, then beam failure recovery efficiency improves and latency reduces, but the complexity of the transmission configuration updating process increases
Solution Approach 1:
The invention changes the parameter of beam selection from base-station-controlled to UE-autonomous. The UE independently evaluates beam quality parameters (such as RSRP, SINR) and selects candidate beams based on these measurements, reporting only the selected beam index to the base station. This parameter change simplifies the overall process by reducing the number of signaling exchanges while maintaining recovery efficiency.
Solution Approach 2:
The invention extracts the beam selection function from the base station's control process and assigns it to the UE. By taking out the autonomous beam selection capability from centralized base station control and placing it at the UE level, the system reduces signaling overhead and configuration complexity while improving recovery speed.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that allow secondary cell (SCell) beam failure recovery using a primary cell (PCell). A user equipment (UE) may transmit, via the PCell, an indication of a beam failure of the SCell in a scheduling request (SR) or in a dedicated SR message. After receiving the indication, the base station may request a report from the UE or alternatively, may monitor a set of resources for a report without transmitting a request to the UE. The report may be transmitted via the PCell and may include an indication of a selected beam to use for subsequent communications on the SCell. Based on the report, the base station may modify its transmission configuration for the SCell and communicate with the UE via the selected beam.