Beam Failure Recovery via Candidate Beam Feedback
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Solution Overview
Problem
In communication systems, especially those using new radio access systems, beam failures occur when the quality of serving cell beams falls below a threshold, leading to inefficiencies and interference, and existing recovery mechanisms struggle to identify and switch to better beams during beam failure recovery procedures.
Innovation Solution
A mechanism where a terminal device determines a candidate beam for recovery based on link qualities and transmits its identity and characteristics to a network device, allowing the network to perform beam failure recovery using a beam with better link quality, enabling proper configuration and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery is performed using existing mechanisms, then the recovery procedure can be initiated, but the system cannot identify or switch to beams with better link quality
Solution Approach 1:
The terminal device measures link qualities of multiple beams, selects a candidate beam based on these measurements, and feeds back the identity and characteristics of the selected beam to the network device. This feedback mechanism enables the network to make informed decisions about beam switching, resolving the contradiction between initiating recovery and identifying better beams.
Solution Approach 2:
Before performing beam failure recovery, the terminal device performs preliminary actions by measuring link qualities of multiple beams, selecting a candidate beam with better link quality, and preparing the beam identity and characteristics information. This preliminary selection ensures that when recovery is initiated, the system already has identified a suitable alternative beam.
2Reliability
If the terminal device transmits detailed beam information to the network, then the network can make informed recovery decisions, but the signaling overhead increases
Solution Approach 1:
The terminal device extracts only the essential information needed for beam failure recovery - the identity of the candidate beam and its characteristics - and transmits this extracted information to the network device. This selective extraction provides sufficient information for informed recovery decisions while minimizing signaling overhead by excluding unnecessary data.
3Reliability
If the system performs comprehensive beam quality measurement and selection, then the best candidate beam can be identified, but the recovery time increases
Solution Approach 1:
The terminal device performs measurements on multiple beams and selects the best candidate based on link quality, but this selection process is optimized to balance comprehensiveness with speed. By measuring a focused set of beams and applying efficient selection criteria, the system achieves sufficient beam selection accuracy without excessive measurement overhead that would prolong recovery time.
Data Source
AI summary
Example embodiments of the present disclosure relate to beam failure recovery mechanism. According to embodiments of the present disclosure, there are provided an improved solution for reporting candidate beams in serving cells. If a beam failure occurs in a serving cell, the first device determines a candidate beam for beam failure recovery from a plurality of beams in the serving cell based on link qualities of the plurality of beams. The first device also determines a resource configuration for a random access for the beam failure recovery for the first device or a resource to be used for the random access, The first device further generates an indication for indicating a characteristic of the candidate beam or a characteristic of a beam for performing the random access, based on at least one of the determined resource configuration or the determined resource. The first device also transmits an identity of the candidate beam and the indication to a second device. The second device performs the beam failure recovery based on the candidate beam and the characteristic of the candidate beam.