Spatial Separation Beam Reporting for 5G Link Reliability
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Solution Overview
Problem
High-frequency wireless communication systems face challenges in maintaining reliable radio links due to poor beamforming performance, leading to frequent radio link losses and connectivity issues, especially with the emergence of 5G networks using high-frequency spectrum.
Innovation Solution
A method is proposed to configure wireless devices to identify and report spatially and angularly separated downlink beams during measurements, allowing for the selection and configuration of backup beams that satisfy channel quality and spatial separation criteria, ensuring reliable connectivity by providing alternative communication paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If beamforming is used to compensate for link budget loss in high frequency spectrum, then signal strength is improved in specific directions, but the system becomes more susceptible to sudden changes in link quality or loss of coverage due to narrow beam characteristics
Solution Approach 1:
The wireless device performs measurements and identifies backup downlink beams in advance before the primary beam fails. The device determines a set of candidate beams that satisfy both channel quality criteria and spatial separation criteria, reporting this information to the network node proactively so that a reliable backup is ready when needed.
Solution Approach 2:
The invention changes the selection criteria for backup beams by introducing spatial separation parameters (angular separation, direction of arrival differences) in addition to traditional channel quality metrics. This ensures that backup beams are geometrically distinct from the primary beam, reducing correlation in failure modes.
2Productivity
If narrow transmission beams are used to increase signal strength, then data rate transmission coverage is improved for distant users, but the radio link becomes more challenging to maintain due to poor refraction properties and susceptibility to beam loss
Solution Approach 1:
The system performs beam measurements and identifies alternative beams before the current beam fails. The wireless device continuously monitors candidate beams and maintains a prepared list of spatially separated alternatives, enabling rapid switchover when the primary narrow beam is lost due to refraction issues or obstacles.
Solution Approach 2:
The invention adds a spatial dimension to beam selection by requiring angular separation and direction of arrival differences between primary and backup beams. This multi-dimensional approach ensures diversity not just in signal quality but in physical propagation paths, mitigating the vulnerability of narrow beams to environmental changes.
3Reliability
If spatially separated backup beams are identified and reported, then connectivity reliability is improved by providing alternative communication paths, but the uplink signaling load increases due to additional measurement and reporting requirements
Solution Approach 1:
The invention uses existing measurement frameworks and reporting mechanisms for multi-purpose use. The same measurement procedures used for primary beam selection are extended to identify backup beams, and existing uplink channels carry both primary and backup beam information, reducing the need for dedicated signaling resources.
Solution Approach 2:
The system applies spatial separation criteria locally at the wireless device level during beam measurement and selection, rather than requiring centralized network processing. This distributes the computational burden and reduces uplink signaling by enabling the device to autonomously filter and identify spatially separated candidate beams before reporting.
Data Source
AI summary
The disclosure relates to methods, devices, and computer programs in mobile communications. More specifically, the proposed technique relates to facilitating communication between a network node and a wireless device. In particular the disclosure relates to introducing spatial separation as a beam reporting condition in order to mitigate the effects of link failure. The disclosure proposes a method for use in a wireless device, for facilitating communication with a network node. The method comprises performing measurements relating to channel quality and spatial separation of a plurality of candidate downlink beams, determining, based on the performed measurements, a set of downlink beams, such that each beam in the set of beams satisfies a channel quality criterion and a spatial separation criterion, and reporting information defining the determined set of downlink beams to a network node.