Beam Recovery Mechanism for 5G Multi-Beam Pair Links
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Solution Overview
Problem
In 5G communication systems, there is a need for effective beam recovery mechanisms in multi-beam based systems to ensure continuous communication links between base stations and terminals, particularly when single/multi-beam pair links (BPL) fail, leading to beam failures that disrupt data transmission on control and data channels.
Innovation Solution
A method for beam recovery is introduced, where terminals receive information on reference signals from base stations to measure and select candidate beams with quality above a threshold, and base stations transmit configuration parameters for beam recovery, allowing for the identification and switching to new beam pairs to maintain communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming and multi-beam techniques are used to increase transmission distance and mitigate propagation loss, then communication reliability is improved, but system complexity increases due to the need for beam management and monitoring
Solution Approach 1:
The terminal autonomously monitors beam link quality and independently triggers beam recovery procedures when failures are detected, without requiring continuous network control. The terminal self-manages beam failure detection, candidate beam identification, and recovery request transmission, reducing network-side complexity while maintaining reliability.
Solution Approach 2:
The system pre-configures multiple candidate beam pairs and establishes monitoring mechanisms before actual beam failures occur. Beam failure detection is performed continuously on pre-established beam pairs, and candidate beams are pre-identified through reference signal measurements, enabling rapid recovery without complex real-time decision-making.
2Duration of action of stationary object
If continuous monitoring of beam links is performed to detect beam failures, then communication continuity is improved, but signaling overhead and processing burden increase
Solution Approach 1:
Beam failure monitoring is performed selectively on specific control resource sets (CORESETs) and beam pairs that are critical for communication, rather than uniformly across all beams. The terminal focuses monitoring resources on beams with higher importance or those showing degradation trends, reducing overall monitoring overhead while maintaining continuity of critical links.
Solution Approach 2:
The system dynamically adjusts beam failure detection parameters such as threshold values, monitoring periods, and reference signal configurations based on channel conditions and traffic requirements. When channels are good, monitoring can be relaxed; when degradation is detected, monitoring intensity increases, optimizing the balance between continuity and overhead.
3Measurement precision
If multiple candidate beams are measured and evaluated to select the best beam for recovery, then beam recovery accuracy is improved, but processing time and computational load increase
Solution Approach 1:
Instead of exhaustively evaluating all possible candidate beams, the terminal measures and selects from a limited set of pre-configured candidate beam pairs. The network provides a subset of promising candidate beams based on historical data and channel conditions, allowing the terminal to perform rapid measurements on fewer beams while maintaining recovery accuracy through intelligent candidate selection.
Solution Approach 2:
Candidate beam pairs are pre-identified and configured by the network based on prior channel measurements, beam sweeping results, and historical performance data. This preliminary preparation allows the terminal to quickly switch to pre-vetted candidate beams during recovery without performing exhaustive real-time measurements, reducing recovery time while maintaining accuracy through pre-selected high-quality candidates.
Data Source
AI summary
A communication method and system for converging a fifth generation (5G) communication system for supporting higher data rates beyond a fourth generation (4G) system with a technology for Internet of things (IoT) are disclosed. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method of a terminal for selecting a candidate beam in a wireless communication system is disclosed. The method includes receiving information on a reference signal from a base station, measuring a plurality beams based on the information on the reference signal, and determining at least one candidate beam among the plurality beams, the candidate beam comprising a beam quality above a threshold.