Beam Recovery via Shared PUCCH in Wireless Systems
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Solution Overview
Problem
In high-frequency communication systems, such as millimeter waves and terahertz, beam errors can occur due to decreased energy reception by smaller antennas and increased propagation loss, leading to significant time delays in overcoming these errors.
Innovation Solution
A method where user equipment determines beam errors based on threshold values and consecutive decoding errors, and dynamically requests SRS transmission approval through shared or specific PUCCH channels to rapidly initiate beam recovery procedures, allowing for efficient beamforming and CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If beamforming is used in high-frequency communication, then transmission power is concentrated and communication range is extended, but beam errors occur more frequently due to propagation loss and smaller antenna size
Solution Approach 1:
The patent applies preliminary action by configuring dedicated PUCCH resources in advance for beam failure recovery. When beam failure is detected, the UE can immediately use the pre-configured PUCCH resources to transmit recovery requests without waiting for resource allocation, thereby reducing recovery time and improving reliability while maintaining beamforming benefits
Solution Approach 2:
The patent introduces PUCCH as an intermediary channel specifically for beam failure recovery scenarios. This dedicated communication path allows rapid exchange of recovery requests and responses between UE and base station, resolving the reliability issue caused by beam errors in high-frequency beamforming without sacrificing power concentration
2Productivity
If conventional uplink control channels are used for beam recovery, then resource allocation is maintained, but significant time delays occur in overcoming beam errors
Solution Approach 1:
The patent implements preliminary action by pre-configuring dedicated PUCCH resources for beam failure recovery before actual beam failure occurs. This allows the UE to immediately transmit recovery requests using predetermined resources, eliminating resource allocation delays and significantly improving beam recovery speed while reducing time loss
Solution Approach 2:
The patent applies dynamics by enabling flexible switching between normal uplink control channels and dedicated beam failure recovery PUCCH resources. The system dynamically selects the appropriate channel based on whether beam failure is detected, optimizing both recovery speed and resource utilization
3Productivity
If shared PUCCH resources are used for all user equipment, then resource efficiency is improved, but resource conflicts may occur during simultaneous access
Solution Approach 1:
The patent applies segmentation by dividing PUCCH resources into different types: dedicated resources for specific UEs and shared resources for all UEs. For beam failure recovery, the system uses dedicated PUCCH resources configured per UE, which eliminates resource conflicts while maintaining efficient utilization through the shared pool for other purposes
Data Source
AI summary
A method of user equipment may comprise: determining whether an error condition for a first beam communicating with a base station is met; when it is determined that the error condition for the first beam is met, determining whether a first physical uplink control channel (PUCCH) allocated to the user equipment is present within a predetermined first period of time; when it is determined that the first PUCCH is not present, transmitting a sounding reference signal (SRS) transmission approval request and an identifier of the user equipment to the base station through a second PUCCH pre-configured to be shared by all pieces of user equipment; and when an SRS transmission approval is received from the base station, transmitting an SRS to the base station.