UE Random Access Backoff for Beam Failure Recovery
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Solution Overview
Problem
In 5G radio access technology using beam forming, the reconfiguration of beams for beam failure recovery is slow, leading to prolonged service interruptions due to external changes such as mobile device rotation or obstruction, which affects data transmission reliability.
Innovation Solution
A user equipment (UE) apparatus and method that includes a transmission unit for sending a random access preamble and a reception unit for receiving a random access response, with specific configuration to indicate a MAC CE for cell radio network temporary identifier (C-RNTI) and beam failure recovery in uplink transmissions, prioritizing processing and storage of MAC PDUs to expedite beam failure recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam forming is used for high frequency communication, then communication reliability is improved, but the system becomes more sensitive to external changes such as mobile device rotation or obstruction
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple candidate beams and establishing a beam failure recovery mechanism before actual beam failure occurs. When beam failure is detected, the UE can quickly switch to alternative pre-prepared beams or initiate recovery procedure without waiting for complete signal degradation, thereby reducing the impact of external changes like device rotation or obstruction.
2Reliability
If narrow beams are used for information transmission, then communication quality is improved, but the reconfiguration speed during beam failure recovery becomes slow
Solution Approach 1:
The patent applies preliminary action by pre-establishing candidate beam lists and recovery procedures before beam failure occurs. When failure is detected, the UE can immediately initiate recovery using pre-configured parameters and candidate beams, significantly accelerating the reconfiguration speed compared to discovering and selecting beams in real-time during failure.
Solution Approach 2:
The patent implements feedback mechanisms where the network provides beam failure indication information and the UE reports beam failure status back to the network. This feedback loop enables coordinated beam recovery procedures where both UE and network can optimize the recovery process, improving reconfiguration speed while maintaining communication quality.
3Reliability
If beam failure recovery procedure is implemented, then communication reliability is improved, but service interruption time increases
Solution Approach 1:
The patent reduces service interruption time by implementing preliminary action through pre-configured candidate beams and recovery procedures. When beam failure is detected, the UE can quickly switch to alternative beams or initiate recovery using pre-established parameters, minimizing the time the service is interrupted compared to discovering recovery paths in real-time.
Solution Approach 2:
The patent applies the skipping principle by enabling the UE to skip certain verification steps and directly proceed to beam recovery using pre-configured candidate beams and failure recovery indicators. This allows the recovery procedure to rush through intermediate steps and achieve faster service restoration, reducing overall service interruption time while maintaining reliability.
Data Source
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AI summary
The present disclosure provides a method executed by user equipment, the method comprising: executing a random access procedure; and if a random access response message includes a backoff indicator, setting a preamble backoff time parameter to a time value corresponding to the backoff indicator multiplied by a configured parameter. Furthermore, the present disclosure further provides corresponding user equipment.