Beam Selection in Carrier Aggregation for 5G Mobility
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Solution Overview
Problem
In the context of 5G mobile communication systems, user equipment (UE) mobility between beams is challenging due to the need for precise beam management and selection in higher frequency bands, where narrower beams require more frequent switching to maintain connectivity and coverage.
Innovation Solution
A method and apparatus that enable UE to receive beam configuration information from a base station, measure, and select serving beams based on measurement results, allowing for efficient mobility between beams by using beamformed reference signals and specific radio resources, with the base station also selecting beams based on UE measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher frequency bands (10 GHz or higher, 30 GHz or higher) are used to achieve higher data rates and capacity, then bandwidth and system capacity are improved, but path loss increases and coverage area decreases
Solution Approach 1:
The patent applies segmentation by dividing the coverage area into multiple sectors, each served by a dedicated antenna array. This allows the system to focus energy in specific directional segments, compensating for the reduced coverage area inherent in high-frequency bands while maintaining high data rates through targeted beam formation.
Solution Approach 2:
The patent implements local quality by configuring different antenna arrays with specific beamforming characteristics tailored to their respective coverage areas. Each antenna array optimizes its radiation pattern and beam width to match local propagation conditions, ensuring reliable coverage in high-frequency bands while maintaining high spectral efficiency.
2Reliability
If multiple antenna arrays are deployed to extend coverage in higher frequency bands, then coverage area is improved, but system complexity and cost increase
Solution Approach 1:
The patent applies universality by designing antenna arrays that can dynamically adapt their beamforming characteristics to serve multiple functions: coverage extension, interference management, and capacity enhancement. The same antenna infrastructure supports both wide-area coverage and high-rate point-to-point links, reducing the need for separate specialized hardware.
Solution Approach 2:
The patent implements dynamics through real-time beamforming adjustment, where antenna arrays dynamically change their radiation patterns based on user location, channel conditions, and traffic demands. This dynamic adaptation allows the system to extend coverage efficiently without requiring additional static infrastructure, thereby controlling system complexity.
3Reliability
If beamforming is used to compensate for path loss in higher frequency bands, then signal strength is improved, but beam alignment precision requirements increase
Solution Approach 1:
The patent applies preliminary action through a two-stage beam alignment process: first establishing coarse beam alignment using wider beams and simplified signaling, then refining to precise alignment using narrower beams. This preliminary coarse alignment reduces the initial search space and complexity, making the subsequent precise alignment more achievable and reliable.
Solution Approach 2:
The patent introduces beamformed reference signals as an intermediary mechanism that facilitates precise beam alignment. These reference signals provide measurable indicators that enable the receiver to accurately determine the optimal beam direction, thereby achieving high beam alignment precision without requiring complex direct measurement methods.
4Reliability
If narrower beams are used in higher frequency bands to increase gain, then antenna gain is improved, but beam switching frequency increases and mobility management becomes more difficult
Solution Approach 1:
The patent applies merging by coordinating beam switching across multiple antenna arrays and carriers. When a user moves between coverage areas, the system merges the beam management processes, maintaining continuous service by coordinating handovers and beam switches across different arrays and frequency carriers, thereby reducing the overall complexity of managing multiple narrow beams.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors user location, channel conditions, and beam performance metrics. This feedback enables proactive beam switching and adjustment, allowing the system to anticipate mobility events and optimize beam configurations before performance degradation occurs, thereby simplifying mobility management despite the use of narrow beams.
Data Source
AI summary
A radio terminal (2) receives beam configuration information from a base station (1), measures a plurality of transmission beams (10) transmitted from the base station (1) in accordance with the beam configuration information, and uses one or more beams selected from among the plurality of transmission beams (10) based on a measurement result as a serving beam. Each of the plurality of transmission beams carries a beamformed reference signal to be measured by the radio terminal (2). The beam configuration information includes a reference signal configuration indicating a radio resource used on each beam for transmitting the beamformed reference signal. It is thus, for example, possible to contribute to provision of a procedure for UE mobility between beams.