Beam Failure Recovery Random Access Indication
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Solution Overview
Problem
In New Radio (NR) systems, when beam failure occurs, existing technologies fail to accurately distinguish between beam failure recovery (BFR) procedure-related random access failures and other causes, leading to inappropriate processing by the base station.
Innovation Solution
A method and device for user equipment (UE) to initiate a random access procedure to a base station through an alternative cell during beam failure recovery, and transmit indication information to the base station when the procedure fails, specifically setting the cause as 'beamFailureRecoveryFailure' to differentiate the failure source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE initiates a random access procedure through the cell during beam failure recovery, then the beam failure recovery procedure can be executed, but the base station cannot accurately determine whether the random access failure is caused by beam failure recovery or other causes
Solution Approach 1:
The patent segments the failure cause information by introducing a specific indication field that distinguishes between beam failure recovery-related random access failures and other types of failures. This segmentation allows the base station to separately identify and process different failure causes, resolving the information loss problem.
Solution Approach 2:
The patent introduces an intermediary indication field in the failure report message that acts as a mediator between the UE and base station. This field specifically indicates whether the random access failure is related to beam failure recovery, enabling the base station to accurately determine the failure cause without losing critical information.
2Measurement precision
If the UE transmits indication information about random access failure, then the base station can determine the failure cause, but the signaling overhead increases
Solution Approach 1:
The patent applies local quality by adding the indication field only where necessary - specifically in the failure cause indication portion of the failure report message. This localized addition provides precise failure cause identification without unnecessarily increasing overall signaling overhead across the entire communication protocol.
3Ease of operation
If the base station processes all random access failures uniformly, then the processing is simple, but the processing is not appropriate for beam failure recovery failures
Solution Approach 1:
The patent introduces dynamics by enabling the base station to adapt its processing behavior based on the indication field value. When the indication field shows beam failure recovery-related failure, the base station executes specific beam failure recovery procedures; otherwise, it handles other types of failures differently. This dynamic processing ensures both ease of operation through clear decision logic and reliability through appropriate failure handling.
Data Source
AI summary
An information transmission method can be applied to a user equipment, and include: when a beam failure recovery procedure is initiated for a first cell, initiating random access to a base station through a second cell, wherein the second cell is the first cell or another cell other than the first cell; and if the number of times random access is initiated without being able to complete the random access reaches a preset number, transmitting to the base station indication information for a problem existing in a cell group where the second cell is located, wherein the indication information is used to indicate that the cause for the problem existing in the cell group is the failure of random access caused by the initiation of the beam failure recovery procedure.