Beam Failure Recovery via Candidate Beam Selection
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Solution Overview
Problem
Current mobile communication systems face challenges in supporting high-speed data services due to resource shortages and the need for increased data traffic, transfer rates, and energy efficiency, particularly in beam failure recovery mechanisms.
Innovation Solution
A method for performing beam failure recovery in a wireless communication system involves receiving control information with candidate beam configurations, selecting a reference signal (RS) meeting a certain quality threshold, and transmitting a beam failure recovery request using an uplink resource associated with the selected RS, specifically a physical random access channel (PRACH) preamble.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery mechanisms are implemented to maintain high-speed data services, then system reliability is improved, but device complexity increases
Solution Approach 1:
The base station pre-configures multiple candidate beams and their associated uplink resources (PRACH preambles) before beam failure occurs. When beam failure is detected, the UE can immediately select from pre-configured candidate beams without requiring complex real-time beam selection procedures, thus improving recovery reliability while reducing operational complexity
Solution Approach 2:
The UE autonomously monitors downlink beam quality, detects beam failure, selects an appropriate candidate beam from pre-configured options, and transmits the recovery request using the associated uplink resource. This self-service mechanism reduces the need for complex network-controlled beam management while maintaining reliable recovery capability
2Reliability
If multiple candidate beams are configured for beam failure recovery, then recovery reliability is improved, but information overhead increases
Solution Approach 1:
The same set of candidate beams and associated uplink resources is used for multiple purposes: initial beam establishment, beam failure recovery, and beam refinement. This multi-functional approach allows the system to support reliable beam failure recovery without requiring separate dedicated resources, thereby reducing overall control information overhead
Solution Approach 2:
The system dynamically adjusts the number and configuration of candidate beams based on channel conditions and service requirements. Under normal conditions, fewer candidate beams are configured to reduce overhead, while under poor channel conditions or for critical services, more candidate beams are configured to improve recovery reliability
Data Source
AI summary
This specification provides a beam failure recovery method in a wireless communication system. In this specification, a beam failure recovery method performed by a UE includes: receiving, from a base station, control information related to a candidate beam configuration for the beam failure recovery; selecting an RS having a quality of the threshold or more among the RSs related to the candidate beam identification; and; transmitting, to the base station, a beam failure recovery request based on an uplink (UL) resource related to the selected RS.