High-Frequency Beam Failure Recovery With Two-Step Beam Selection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently recovering from beam failures, particularly in high-frequency communications, where beam failure detection and recovery mechanisms are not adequately addressed.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to receive configuration information for candidate beam reference signals of different types, allowing it to detect beam failures and perform measurements to determine a suitable beam recovery type, selecting candidate beams through a one-step or two-step process, and transmitting indications to the network for confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection and recovery mechanisms are not adequately addressed in high-frequency communications, then system reliability deteriorates, but implementing comprehensive mechanisms increases device complexity
Solution Approach 1:
The patent segments beam failure recovery into two distinct types: one-step BFR and two-step BFR. Each type has its own specific procedures, message structures, and resource allocation methods. This segmentation allows the system to handle different beam failure scenarios with appropriate complexity levels, improving reliability without uniformly increasing device complexity across all scenarios.
Solution Approach 2:
The patent implements dynamic selection between one-step and two-step BFR types based on current communication conditions, beam failure characteristics, and network configuration. The WTRU and network can adaptively choose the appropriate BFR type, allowing the system to optimize between reliability and complexity dynamically rather than being fixed at one approach.
2Measurement precision
If comprehensive beam measurements and selections are performed, then beam selection precision improves, but processing time increases
Solution Approach 1:
The patent applies partial action by performing measurements on a subset of candidate beams rather than all possible beams. In two-step BFR, the WTRU first identifies candidate beams from a larger set, then performs more detailed measurements only on the most promising candidates. This approach achieves sufficient beam selection precision while significantly reducing the time required compared to exhaustive measurement of all beams.
Solution Approach 2:
The patent implements preliminary action through the first step of two-step BFR, where initial beam candidates are identified and pre-evaluated before committing to detailed measurement and selection. This preliminary filtering allows the system to prepare potential beam candidates in advance, reducing the time needed for final beam selection when beam failure occurs.
3Reliability
If multiple candidate beam reference signals are monitored and measured, then beam recovery effectiveness improves, but energy consumption increases
Solution Approach 1:
The patent segments the candidate beam monitoring process into different phases and types. Instead of continuously monitoring all candidate beams with equal intensity, the system divides monitoring into initial detection phase and detailed measurement phase, with different energy requirements. This segmentation allows the WTRU to maintain beam recovery effectiveness while managing energy consumption across different operational phases.
Solution Approach 2:
The patent changes monitoring parameters such as measurement frequency, measurement depth, and candidate beam count based on the BFR type and current communication conditions. In one-step BFR, monitoring may be less intensive, while two-step BFR allows for more detailed measurements of selected candidates. This dynamic parameter adjustment maintains recovery effectiveness while optimizing energy usage.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for beam failure recovery associated with high frequency communications. A wireless transmit receive unit (WTRU) may receive configuration information for candidate beam reference signals (RSs) of a first type or a second type. Upon detecting a beam failure. the WTRU may determine a beam failure recovery type (e.g., a one-step beam failure recovery or a two-step beam failure recovery), and select and transmit a first type candidate beam RS to the network. The WTRU may measure a subset of second type candidate beam RSs (e.g., associated with the first type candidate beam RS). Based on the measurement. the WTRU may select and transmit a second type candidate beam RS from the subset of second type candidate beam RSs to the network.