Millimeter-Wave Beam Recovery Signaling After Link Failure
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Solution Overview
Problem
In millimeter wave communication systems, beam link failures occur frequently due to factors like user movement and blocked channels, leading to unreliable wireless communication and the inability to recover the beam or initiate channel state information reports.
Innovation Solution
A method and apparatus for generating and sending a first type of signaling when beam-related parameters trigger certain thresholds, allowing for beam recovery and channel state information reporting, using dedicated channels and signaling to facilitate beam link recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If directed beam communication is used to obtain link gain, then transmission loss is compensated, but robustness deteriorates due to user movement and blocked channels
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple beam links (primary and secondary beams) before link failure occurs. The secondary beam is prepared in advance as a backup, so when the primary beam link fails due to user movement or blockage, the system can immediately switch to the pre-prepared secondary beam without interruption, thus maintaining communication robustness while compensating for transmission loss.
2Device complexity
If beam link recovery procedure is not provided, then system complexity is reduced, but communication reliability deteriorates after beam link failure
Solution Approach 1:
The patent applies segmentation by dividing the beam management function into separate, independent components: primary beam establishment, secondary beam preparation, and beam failure detection. Each component operates independently with clear triggers and actions. When link failure is detected, only the specific beam recovery procedure is activated without reconfiguring the entire system, thus maintaining reliability while minimizing added complexity.
3Loss of information
If beam and channel state information reports cannot be actively initiated, then signaling overhead is reduced, but beam recovery capability deteriorates
Solution Approach 1:
The patent applies feedback by implementing a trigger-based mechanism where the UE monitors beam quality metrics and actively initiates beam recovery reporting when failure conditions are detected. The feedback loop includes: monitoring beam quality, detecting failure based on predefined thresholds, triggering beam recovery procedure, and reporting to the network. This selective feedback approach maintains low signaling overhead under normal conditions while enabling rapid beam recovery when needed.
Data Source
AI summary
The present disclosure provides a processing method and apparatus for recovering a beam. The method includes: generating a first type of signaling comprising an index corresponding to a resource selected from a set of resources for a reference signal; transmitting the first type of signaling over a random access channel to a base station; assuming a Quasi Co-Location (QCL) relation between the selected resource and a downlink control channel, and the selected resource and a downlink data channel; receiving a second type of signaling carried in the downlink control channel using the assumed QCL relation between the selected resource and the downlink control channel, the second type of signaling further comprising an identification of the terminal device; and receiving a data transmission carried in the downlink data channel according to the QCL relation between the selected resource and the downlink data channel.