Near-Field Beam Selection Using Staged Reference Signal Measurement
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently selecting and managing near-field and far-field beams for optimal signal transmission and reception, particularly in environments with complex interference and varying network conditions.
Innovation Solution
A wireless transmit/receive unit (WTRU) measures received power of downlink reference signals, determines value ranges, selects appropriate reference signals based on measurement results, and transmits information to the network for beam management, utilizing processors to facilitate this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional beam selection methods are used, then the system is simple to implement, but beam selection accuracy and signal quality deteriorate in near-field environments
Solution Approach 1:
The patent segments the beam management process into distinct stages: initial broad beam sweeping to identify candidate beams, followed by refined measurement of selected beams using CSI-RS. This segmentation allows the system to achieve high beam selection accuracy through multi-stage measurement without requiring all beams to be measured simultaneously, thus managing complexity effectively.
Solution Approach 2:
The patent implements preliminary beam sweeping and candidate beam identification before performing detailed measurements. By pre-selecting candidate beams based on initial measurements and pathloss estimation, the system prepares the measurement set in advance, reducing the complexity of exhaustive beam measurement while maintaining selection accuracy.
2Reliability
If all downlink reference signals are measured to ensure accurate beam selection, then beam selection accuracy improves, but measurement time and processing overhead increase
Solution Approach 1:
The patent applies partial measurement by selecting a subset of candidate beams for detailed measurement rather than measuring all downlink reference signals. The WTRU measures only the necessary portion of beams (those identified as candidates through initial sweeping and pathloss estimation), achieving sufficient beam selection reliability without the time cost of exhaustive measurement.
Solution Approach 2:
The system performs preliminary broad beam sweeping and pathloss-based candidate selection before detailed measurement. This preliminary action identifies which beams warrant further measurement, enabling the system to achieve reliable beam selection by measuring only the most promising candidates rather than all possible beams.
3Productivity
If pathloss-based candidate beam selection is implemented, then measurement overhead is reduced, but the complexity of pathloss estimation and candidate selection increases
Solution Approach 1:
The WTRU autonomously performs pathloss estimation for each candidate beam and independently determines which beams to measure without requiring complex network coordination. The device uses its own measurements and calculations to self-select the measurement set, improving beam management efficiency while keeping network-side complexity low.
Solution Approach 2:
The patent changes the parameter used for beam selection from direct signal strength measurement to pathloss estimation. By using pathloss (a derived parameter combining transmit power and received power) as the basis for candidate selection, the system achieves more robust beam selection that accounts for channel conditions, improving overall management efficiency.
4Reliability
If near-field beam management is implemented, then signal quality in near-field environments improves, but compatibility with existing far-field systems deteriorates
Solution Approach 1:
The patent implements a universal beam management framework that can operate in both near-field and far-field conditions. The system uses the same basic measurement and selection procedures but adapts the candidate beam set and measurement parameters based on the determined propagation environment, allowing a single system to serve multiple scenarios without sacrificing near-field performance.
Solution Approach 2:
The patent makes the beam management system dynamic by allowing it to adapt its behavior based on the near-field or far-field condition. The WTRU determines which mode it operates in and adjusts its measurement and selection strategy accordingly, enabling the system to maintain high signal quality in near-field while remaining compatible with existing far-field deployments.
Data Source
AI summary
Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for beam selection. A wireless transmit/receive unit, WTRU, measures received power of a received first downlink, DL, reference signal, RS, received from a network, and, upon determination that a value based on the measured received power satisfies at least one first criterion, determines a value range to which the value belongs, determines a set of second DL RS associated with the determined value range, measures the determined set of second DL RS to obtain a corresponding set of first measurement results, selects a DL RS from the set of second DL RS based on the set of first measurement results, and transmits, to the network, information indicative of at least one of the selected DL RS and the corresponding first measurement result.