Secondary Cell Beam Failure Recovery Indicator in PUCCH Reporting
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Solution Overview
Problem
Wireless devices face challenges in reporting beam failure recovery (BFR) procedures for secondary cells, as existing methods are not effective in informing the base station of failures, leading to incomplete or unsuccessful recovery processes.
Innovation Solution
Modifying the physical uplink control channel (PUCCH) reporting to include an indication of the BFR procedure, which replaces or adds to signal strength and other characteristic fields, allowing for comprehensive reporting of downlink signal characteristics and BFR status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device uses the same reporting procedure for both primary and secondary cells, then the reporting method is simple and unified, but the beam failure recovery information for secondary cells cannot be effectively communicated to the base station
Solution Approach 1:
The patent segments the beam failure recovery reporting by cell type, implementing separate reporting mechanisms for primary cells and secondary cells. For secondary cells, it introduces a specific indicator field in the MAC CE that explicitly signals BFR status, distinguishing it from the generic reporting used for primary cells. This segmentation enables effective communication of BFR information for secondary cells while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent introduces an intermediary indicator field within the MAC CE structure that serves as a mediator to convey BFR information for secondary cells. This indicator acts as a signal that triggers the base station to interpret the accompanying beam identity and quality information as BFR-related data, enabling effective communication without requiring a completely separate reporting procedure.
2Loss of information
If the PUCCH reporting includes only signal strength fields, then the reporting structure is simple, but the beam failure recovery status information is incomplete
Solution Approach 1:
The patent merges the BFR indication with the existing signal strength reporting structure by incorporating an indicator field within the MAC CE that contains both beam identity and quality information. This merging approach allows the BFR status to be communicated together with signal characteristics in a single unified report, reducing information loss without significantly increasing structural complexity.
Solution Approach 2:
The patent adds another dimension to the reporting structure by introducing a binary indicator field that signals whether the reported information pertains to BFR or generic signal quality. This additional dimension enables the base station to differentiate between BFR reports and regular signal quality reports, ensuring complete BFR status information is captured while maintaining a relatively simple extended structure.
Data Source
AI summary
Systems, apparatuses, and methods are described for wireless communications. A wireless device may inform a base station of a failure of a failure recovery procedure for a secondary cell. The wireless device may include an indicator of the failure in a report providing, or configured to provide, values for signal strength or other characteristic of a downlink signal. The indicator may be in addition to, and/or may replace, one or more indicators of signal strength or other characteristic.