Beam Failure Recovery Random Access for Narrow-Beam Mobility
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Solution Overview
Problem
In wireless communication systems, beam failure can occur when user equipment (UE) moves out of the coverage of a narrow beam, leading to inefficiencies in data scheduling and control channel detection, which existing random access procedures struggle to address effectively.
Innovation Solution
A specific random access configuration is implemented for beam failure recovery, optimizing parameters such as maximum preamble transmission attempts, RAR window size, and contention free random access resources to enhance the success and reduce the delay of beam recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is used to improve coverage and data rate, then SINR is improved, but beam coverage becomes narrow causing beam failure when UE moves
Solution Approach 1:
The system dynamically switches between beamformed communication and random access procedures based on beam quality. When beam failure is detected, the system transitions to a dynamic random access process that selects from multiple candidate beams, allowing the communication system to adapt to changing channel conditions and UE movement patterns.
Solution Approach 2:
The patent changes the parameter of beam selection by introducing multiple candidate beams with different spatial directions. The system modifies the communication parameters by switching from a single fixed beam to a set of alternative beams, enabling the system to adapt when the primary beam becomes inadequate.
2Reliability
If existing random access procedures are used for beam failure recovery, then beam recovery can be attempted, but success rate is low and delay is high
Solution Approach 1:
The system performs preliminary actions by pre-configuring multiple candidate beams and their associated random access resources before beam failure occurs. When beam failure is detected, the UE can immediately utilize the pre-prepared candidate beams without needing to search for new beams, thereby reducing recovery delay and increasing success rate.
Solution Approach 2:
The patent introduces candidate beams as intermediaries between the failed beam and the UE. These candidate beams serve as alternative pathways that the UE can use to re-establish communication, acting as a mediator that facilitates faster and more reliable beam recovery compared to traditional random access procedures.
3Productivity
If narrow beam is used to improve data rate, then SINR increases, but UE may suddenly go out of coverage leading to beam failure
Solution Approach 1:
The system maintains high data rates through narrow beamforming while dynamically monitoring beam quality and having ready alternative candidate beams. This dynamic approach allows the system to switch quickly when coverage is lost, maintaining both high productivity and reliability by combining narrow beam benefits with fast recovery capabilities.
Solution Approach 2:
The patent prepares cushioning measures by configuring multiple candidate beams in advance. These candidate beams act as a safety buffer that prevents complete communication failure when the primary narrow beam becomes inadequate, thereby cushioning against the loss of coverage continuity while maintaining high data rates during normal operation.
Data Source
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AI summary
A method for random access for beam failure recovery is disclosed. In the method, specific random access configuration for the beam failure recovery is received. In the event of a beam failure, a random access procedure is performed according to the specific random access configuration.