Beam Recovery Selection Using Spatial Diversity and Power Estimation
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Solution Overview
Problem
The UE decision mechanism for selecting gNB 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
1Reliability
If the UE re-attempts beam recovery over the same beam and increases transmit power, then the probability of success may improve, but the UE power consumption increases
Solution Approach 1:
The patent changes the selection parameter from simple RSRP ranking to a composite metric that includes spatial diversity (angular separation) and estimated required transmit power. This allows the UE to select beams that balance success probability with power consumption, rather than always choosing the highest RSRP beam which may require excessive power for recovery
Solution Approach 2:
The patent performs preliminary estimation of required transmit power for each candidate beam before actual beam recovery attempt. This preliminary action allows the UE to predict power requirements and make informed decisions about which beam to select, avoiding situations where power increase would be necessary during the recovery process
2Use of energy by moving object
If the UE selects a different candidate beam without power ramping, then the power consumption is reduced, but the beam recovery success rate may decrease
Solution Approach 1:
The patent introduces a new selection criterion that combines spatial diversity with estimated required transmit power. This parameter change enables the UE to identify beams that offer both lower power consumption and adequate recovery success probability, resolving the trade-off between power saving and reliability
Solution Approach 2:
The patent dynamically adjusts beam selection based on real-time conditions including spatial diversity measurements and estimated power requirements. The selection process is adaptive rather than static, allowing the UE to optimize between power consumption and success rate based on current channel conditions and beam characteristics
3Ease of operation
If the UE ranks candidate beams based only on RSRP, then the selection process is simple, but the beam recovery performance is sub-optimal due to lack of consideration for other affecting factors
Solution Approach 1:
The patent changes the ranking parameter from单一的 RSRP metric to a composite parameter that includes spatial diversity (angular separation between beams) and estimated required transmit power. This parameter enhancement maintains computational feasibility while significantly improving beam recovery performance by considering multiple affecting factors
Solution Approach 2:
The patent creates a universal beam selection framework that can evaluate multiple candidate beams using a unified metric that incorporates diverse factors (spatial diversity, power requirements, signal quality). This multi-functional approach replaces the simple RSRP ranking with a comprehensive evaluation method that handles various beam characteristics uniformly
Data Source
AI summary
An apparatus including: circuitry for receiving reference signals including a plurality of channel synchronization signal blocks and/or state information reference signals on a downlink channel; circuitry for measuring received signal power and/or quality level of said reference signals; circuitry for estimating arrival directions or an arrival antenna panel for a plurality of beams associated with said reference signals; circuitry 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; circuitry 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 circuitry for sending the random access channel preamble on the selected beam.