Dynamic Beam Search Grouping for High-Speed Wireless Backhaul
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Solution Overview
Problem
In high-speed moving bodies like trains, the beam-forming technology in mobile wireless backhaul networks faces significant signal attenuation due to the rapid movement, especially in high-frequency bands, leading to performance issues as the beam-forming speed fails to keep pace with the terminal's movement.
Innovation Solution
An apparatus and method that include a position searching unit to detect distance, speed, and direction between the base station and mobile terminal, with a beam setting unit adjusting the number and direction of beam search groups and periods based on these parameters, using phased-array or multiple horn antenna structures to optimize beam-forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-forming technology is used in high-speed mobile wireless backhaul networks, then signal transmission performance is improved, but signal attenuation increases due to rapid movement
Solution Approach 1:
The patent implements dynamic beam-forming by continuously adjusting beam direction and characteristics based on real-time position information of the mobile terminal. The base station performs rapid beam sweeping and selection to track the moving terminal, ensuring the beam remains aligned with the terminal's position despite high-speed movement, thereby maintaining signal transmission performance while compensating for attenuation caused by motion.
Solution Approach 2:
The system performs preliminary beam search and position detection before actual data transmission. The base station pre-establishes beam directions based on predicted terminal positions and prepares beam-forming parameters in advance, allowing rapid response to terminal movement and reducing signal attenuation that would occur with delayed beam adjustment.
2Measurement precision
If beam search coverage is increased to track high-speed moving terminals, then tracking accuracy is improved, but beam search time increases
Solution Approach 1:
The patent divides the beam search space into multiple beam search groups, each covering a specific angular range. Instead of searching all possible directions uniformly, the system segments the search area and focuses computational resources on relevant segments based on terminal movement patterns, thereby maintaining tracking accuracy while reducing overall search time.
Solution Approach 2:
The system applies different beam search strategies to different spatial regions. Areas with higher probability of terminal presence or faster movement require more intensive beam searching, while other regions use coarser search patterns. This localized approach to beam search quality ensures accurate tracking where needed while minimizing time consumption in less critical areas.
3Strength
If beam width is narrowed to improve signal focus, then signal strength is improved, but beam search coverage decreases
Solution Approach 1:
The patent dynamically adjusts beam width based on terminal distance and movement speed. When the terminal is far away or moving slowly, narrower beams provide focused signal strength. When the terminal is close or moving rapidly, the system widens the beam to maintain coverage. This dynamic adaptation resolves the contradiction between signal strength and search coverage by optimizing beam characteristics in real-time according to operational conditions.
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 solution enables efficient and quick beam-forming in high-speed mobile wireless backhaul networks, enhancing signal transmission and reception characteristics by adapting beam characteristics to the moving terminal's speed and distance, thus providing high-performance services.
Implementation Method 1
an antenna unit for radiating a beam according to predetermined beam characteristics and transmitting a signal of the base station to a mobile terminal in a high speed moving body
Implementation Method 2
The antenna unit may be implemented in a first type of phased-array antenna structure
Implementation Method 3
The beam setting unit may set a beam width of the beam search group by adjusting the number of antenna elements of the phased-array antenna structure according to the distance between the base station and the mobile terminal
Data Source
AI summary
An apparatus and method for beam-forming communication in a mobile wireless backhaul network. The apparatus included in a base station includes: an antenna unit radiating a beam according to predetermined beam characteristics and transmitting a signal of the base station to a mobile terminal in a high speed moving body; a position searching unit detecting a distance, a speed, and a direction of movement between the base station and the mobile terminal; a beam setting unit grouping one or more beams according to the detected distance between the base station and the mobile terminal and setting the number of beam search groups in which a beam search is to be performed and a beam search period according to the detected speed and direction of movement; and a beam searching unit searching for the beam of the mobile terminal based on beam setting values set by the beam setting unit.