Reference Signal Switching for Beam Failure Link Maintenance
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining link reliability due to the limited beamforming gain of wide beam synchronization signal blocks, leading to potential link failures as user equipment moves out of cell coverage.
Innovation Solution
User equipment switches from monitoring a wide beam synchronization signal block to a channel state information reference signal with a narrower, higher gain beam, requesting or being configured to do so by the base station, thereby maintaining the link for longer distances and conserving resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wide beam synchronization signal blocks are used for initial connection, then coverage area is improved, but beamforming gain deteriorates leading to link failures
Solution Approach 1:
The system dynamically switches between wide beam synchronization signal blocks for initial connection and narrow beam channel state information reference signals for maintained connection. This dynamic adaptation allows the system to optimize beamwidth based on connection phase, resolving the contradiction between initial coverage area and sustained link reliability
Solution Approach 2:
The invention changes the beamforming parameters by transitioning from wide beam synchronization signal blocks to narrow beam channel state information reference signals. This parameter change enables the system to achieve both wide initial coverage and high gain sustained connectivity by adjusting beam characteristics according to connection requirements
2Reliability
If narrow beam channel state information reference signals are used, then beamforming gain is improved, but coverage area deteriorates
Solution Approach 1:
The system employs dynamic beam switching where narrow beams are activated only after initial connection is established via wide beams. This temporal separation allows narrow beams to provide high gain without sacrificing initial coverage area, as the wide beam phase is completed before transitioning to narrow beam operation
Solution Approach 2:
The wide beam synchronization signal blocks perform preliminary connection establishment before narrow beam channel state information reference signals are activated. This preliminary action ensures coverage area requirements are met during initial access, while subsequent narrow beam operation provides enhanced beamforming gain for maintained connection
3Ease of operation
If wide beam synchronization signal blocks are monitored continuously, then initial connection is achieved, but resources are wasted when links are already established
Solution Approach 1:
The monitoring mechanism dynamically transitions from wide beam synchronization signal blocks to narrow beam channel state information reference signals once connection is established. This dynamic switching eliminates continuous monitoring of wide beams after connection, thereby reducing resource consumption while maintaining ease of initial connection
Solution Approach 2:
Wide beam synchronization signal monitoring performs the preliminary function of initial connection establishment. After this preliminary action is completed, the system switches to narrow beam monitoring, avoiding continuous resource consumption associated with wide beam monitoring while preserving the ease of initial connection
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine to switch from monitoring for a first reference signal to monitoring for a second reference signal, and monitor for the second reference signal. Numerous other aspects are provided.