5G Beam Failure Recovery Using Preconfigured Random Access
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Solution Overview
Problem
In wireless communication systems, beam failure occurs due to terminal movement, necessitating a method for beam recovery to maintain communication connectivity.
Innovation Solution
A method for beam failure recovery involving contention-free and contention-based random access procedures, with configuration information for beam failure recovery (BFR) to quickly restore communication using contention-free or contention-based random access resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contention-based random access procedure is used for beam failure recovery, then beam recovery can be achieved, but signaling overhead increases and battery consumption increases
Solution Approach 1:
The network pre-configures contention-free random access resources (dedicated preambles, time resources, frequency resources) for beam failure recovery before actual beam failure occurs. When beam failure happens, the terminal can immediately use these pre-configured resources without going through contention-based random access, thereby reducing signaling overhead and battery consumption while ensuring reliable beam recovery.
2Speed
If contention-free random access resources are pre-configured for all terminals, then beam failure recovery speed increases, but system resource overhead increases
Solution Approach 1:
Instead of uniformly allocating contention-free random access resources to all terminals, the network dynamically determines which terminals need beam failure recovery capabilities based on their specific conditions (such as terminal capability indicators, service requirements, or channel conditions). Resources are then allocated locally to only those terminals that need them, achieving fast beam recovery for affected terminals while minimizing overall system resource overhead.
3Adaptability or versatility
If contention-based random access procedure is used, then resource allocation flexibility is maintained, but recovery time increases
Solution Approach 1:
The network pre-allocates contention-free random access resources to specific terminals based on their beam failure risk profiles, service types, or capability indicators before actual beam failure occurs. This preliminary allocation enables immediate recovery action when beam failure happens, significantly reducing recovery time compared to contention-based procedures, while the network retains flexibility to adjust resource allocation based on changing conditions.
Data Source
AI summary
The present disclosure relates to a communication technique for converging a 5G communication system, which is provided to support a higher data transmission rate beyond a 4G system with an IoT technology, and a system therefor. The disclosure may be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety related service, or the like) based on the 5G communication technology and the IoT related technology. The disclosure relates to a method for recovering a beam into a correct beam according to a position of a terminal using a non-contention-based and contention-based beam failure recovery method in order to recover a beam failure in which communication is disconnected due to movement of a terminal or the like in a wireless communication system performing beam-based communication services.