Enhanced BFR MAC CE for Secondary Cell Beam Failure Recovery
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Solution Overview
Problem
Existing beam failure recovery procedures in NR communications only consider carrying beam failure recovery information of a secondary cell via legacy BFR MAC CE, leading to inefficiencies such as increased air interface overhead, higher power consumption, and potential service interruptions.
Innovation Solution
The proposed solution involves an apparatus and method for beam failure recovery of a secondary cell, which includes transmitting a first MAC CE containing beam failure information using an enhanced or truncated enhanced BFR MAC CE, and enabling the MAC entity to cancel triggered BFRs, reset the beam failure instance counter, and stop ongoing random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy BFR MAC CE is used to carry beam failure recovery information of secondary cell, then compatibility with existing systems is maintained, but air interface overhead increases and power consumption rises
Solution Approach 1:
The patent changes the format and structure of the BFR MAC CE from legacy to enhanced version, introducing new parameters and information elements that enable more efficient beam failure recovery reporting, thereby reducing redundant transmissions and power consumption
Solution Approach 2:
The enhanced BFR MAC CE is segmented into multiple fields including Ci bitmap, AC field, and candidate beam information, allowing selective transmission of only necessary beam failure recovery information, thus reducing overall overhead and energy usage
2Device complexity
If legacy BFR MAC CE is used for beam failure recovery, then implementation complexity is reduced, but service interruptions occur and user experience deteriorates
Solution Approach 1:
The enhanced BFR MAC CE implements feedback mechanisms that provide detailed beam failure information and recovery status, enabling the network to make informed decisions about resource allocation and beam management, thereby preventing service interruptions
Solution Approach 2:
The patent enables preliminary beam failure detection and reporting through the enhanced MAC CE structure, allowing the network to prepare recovery actions in advance before actual service interruption occurs, thus maintaining service continuity
3Reliability
If beam failure recovery information is transmitted multiple times, then reliability of information delivery is improved, but air interface resource waste increases
Solution Approach 1:
The enhanced BFR MAC CE changes the information structure to include comprehensive beam failure details in a single transmission, eliminating the need for repeated transmissions and reducing air interface resource waste while maintaining delivery reliability
Data Source
AI summary
An apparatus for beam failure recovery of a secondary cell includes: a transmitter configured to transmit a first MAC (Medium Access Control) CE (Control Element) containing beam failure information of the secondary cell, the first MAC CE including a MAC CE containing BFD (Beam Failure Detection)-RS (Reference Signal) set information, the MAC CE containing BFD-RS set information including at least one of the following: an enhanced BFR (Beam Failure Recovery) MAC CE, and a truncated enhanced BFR MAC CE; and processor circuitry configured to, when the first MAC CE containing beam failure information of the secondary cell is transmitted or is successfully transmitted, enable a MAC entity of a terminal equipment to perform one of the following or a combination thereof: cancelling all triggered BFRs of the secondary cell; resetting a beam failure instance counter; considering a beam failure recovery procedure completed successfully.