Beam Recovery Using Spatial Diversity and Preamble Power
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Solution Overview
Problem
The UE's decision mechanism for selecting candidate beams during beam failure recovery in 5G NR networks is sub-optimal, leading to inefficiencies in success rate and power consumption due to lack of consideration for factors affecting beam performance.
Innovation Solution
A method that involves receiving reference signals, measuring signal power and quality, estimating arrival directions and required transmission power for each beam, and selecting candidate beams based on spatial diversity and power thresholds to optimize beam recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE selects candidate beams based only on received signal power, then the beam selection process is simple, but the success rate of beam recovery decreases and power consumption increases
Solution Approach 1:
The patent changes the selection parameters from only received signal power to a composite evaluation including spatial diversity (arrival direction differences) and required transmission power. This multi-parameter approach improves beam recovery success rate while maintaining reasonable selection complexity
Solution Approach 2:
The patent adds a new dimension to beam selection by considering spatial diversity through arrival direction differences. Instead of selecting beams only based on signal power (one dimension), the system now evaluates beams in multiple dimensions including angular separation and power requirements, thereby improving recovery reliability
2Ease of operation
If the UE selects candidate beams based only on received signal power, then the selection criteria are simple, but power consumption increases
Solution Approach 1:
The patent introduces required transmission power as a selection parameter, enabling the UE to identify beams that achieve recovery with lower transmit power. This directly addresses power consumption by making it a criterion for beam selection rather than a consequence of selection
Solution Approach 2:
The UE performs self-optimization by autonomously evaluating multiple beam parameters and selecting the most energy-efficient option. The system serves itself by making intelligent power management decisions without external intervention, reducing overall power consumption
3Device complexity
If the UE does not consider spatial diversity in beam selection, then the selection process is simple, but blockage effects are not mitigated
Solution Approach 1:
The patent adds spatial dimension (arrival direction) to the beam selection criteria. By requiring a minimum angular separation between selected beams and the blocked serving beam, the system exploits spatial diversity to find alternative paths that avoid blockages, improving reliability without excessive complexity
Data Source
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AI summary
An apparatus comprising: means for receiving reference signals comprising a plurality of channel synchronization signal blocks and/or state information reference signals on a downlink channel; means for measuring received signal power and/or quality level of said reference signals; means for estimating arrival directions or an arrival antenna panel for a plurality of beams associated with said reference signals; means for estimating, based on at least the received signal power and/or quality level, a required transmission power for a random access channel preamble for each beam; means for selecting, in response to detecting a failure of a serving beam, another of said beams according to spatial diversity and/or required transmission power; and means for sending the random access channel preamble on the selected beam.