Radio Base Station Adaptive Beam Tracking for High-Speed Handover
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Solution Overview
Problem
In conventional radio communication systems, high-speed terminal movement leads to frequent handovers, increasing network processing load and reducing transmission rates, and results in signal deterioration due to tracking errors from small cell base stations.
Innovation Solution
A method using adaptive array antennas in adjacent radio base stations to dynamically adjust directional beams, where the moving speed of the terminal is monitored, and when exceeding a threshold, the terminal is handed over to a nearby large cell base station that radiates directional beams, reducing handover frequency and improving signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the radio communication terminal is accommodated in a small cell base station and moves at high speed, then the directional beam tracking speed can be fast, but frequent handovers occur increasing network processing load and reducing transmission rate
Solution Approach 1:
The patent applies local quality by differentiating service handling between small cell and large cell base stations. Small cell base stations provide fast directional beam tracking for terminals within their coverage, while large cell base stations handle high-speed terminals to avoid frequent handovers. This localized quality differentiation resolves the contradiction by matching terminal movement characteristics with appropriate base station types.
Solution Approach 2:
The patent implements preliminary action by having the small cell base station detect terminal movement speed before handover decisions are made. When high speed is detected, the system proactively initiates handover to a large cell base station before frequent handovers occur, thereby preventing the degradation of transmission rate while maintaining fast tracking capability where needed.
2Ease of operation
If handover processing starts when terminal moves to cell edge, then connection establishment can be attempted, but high-speed terminals cannot properly establish connection causing communication disconnection
Solution Approach 1:
The patent applies preliminary action by detecting terminal movement speed in advance and making handover decisions before the terminal reaches the cell edge. This proactive approach ensures that high-speed terminals are handed over to large cell base stations with broader coverage before disconnection occurs, maintaining communication reliability while preserving ease of connection establishment.
3Adaptability or versatility
If directional beams track high-speed terminal movement in small cell base station, then beam directionality can be maintained, but tracking errors occur causing signal deterioration
Solution Approach 1:
The patent applies local quality by matching terminal movement characteristics with appropriate base station types. Small cell base stations maintain directional beam tracking for low-speed terminals where high adaptability is needed, while large cell base stations serve high-speed terminals where signal reliability is more critical than precise beam directionality, thus resolving the contradiction between beam adaptability and signal quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces handover frequency, mitigates network processing load, and enhances communication quality by accommodating high-speed terminals in large cell base stations, minimizing signal deterioration from small cell base stations.
Implementation Method 1
an adaptive array antenna technology for radiating directional beams has been applied to each of the small cell base stations 21a, 21b, 21c and the large cell base stations 22a, 22b, the directional beams changing its directionality dynamically
Data Source
AI summary
A radio communication method acquires a moving speed of a radio communication terminal located in a cell formed by a first radio base station. A second radio base station is requested to radiate a dynamic directional beam in a direction of the cell formed by the first radio base station when the moving speed is equal to or more than a predetermined threshold prior to entering a cell formed by the second radio base station. The radio communication terminal is accommodated in the second radio base station that has transmitted the directional beam in response to the request.