Distributed Antenna Beam Control for Straight-Line Interference
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Solution Overview
Problem
In high-density wireless communication environments, densely arranged base stations and user terminals on a straight line cause mutual radio wave interference due to overlapping beam directions.
Innovation Solution
A distributed antenna system with an aggregation station that receives communication path information, determines straight-line arrangements, and controls transmission beams using non-orthogonal multiple access (NOMA) to prevent interference by stopping or superimposing beams with power differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations are densely arranged to improve frequency utilization efficiency, then MIMO transmission capability is enhanced, but mutual radio wave interference occurs when base stations and user terminals are arranged on a straight line
Solution Approach 1:
The patent changes the transmission parameters by applying different power allocation ratios to base stations arranged on a straight line. The aggregation station calculates communication path information and determines power ratios to adjust transmission power, thereby resolving radio wave interference while maintaining dense base station deployment for high frequency utilization efficiency.
Solution Approach 2:
The aggregation station serves as an intermediary between base stations and user terminals. It collects communication path information from base stations, calculates interference conditions, and controls transmission power ratios to prevent radio wave interference in straight-line arrangements while enabling MIMO transmission.
2Speed
If beam search is performed by each base station to improve access efficiency, then initial access speed is enhanced, but radio wave interference occurs when multiple base stations transmit beams in the same direction
Solution Approach 1:
The patent adjusts transmission power parameters during beam search by calculating communication path information and applying power allocation ratios. This allows multiple base stations to perform simultaneous beam search without causing interference when arranged on a straight line, maintaining fast initial access while preventing harmful radio wave overlap.
Solution Approach 2:
The aggregation station performs preliminary calculation of communication path information and determines power allocation ratios before beam transmission begins. This preliminary action enables base stations to conduct beam search simultaneously without interference, improving initial access speed while preventing radio wave conflict.
3Reliability
If transmission power is increased to improve signal strength, then communication reliability is enhanced, but radio wave interference with other base stations increases
Solution Approach 1:
The patent optimizes transmission power parameters by calculating communication path information and applying power allocation ratios. This allows each base station to transmit at appropriate power levels that maintain communication reliability while minimizing interference to other base stations, especially those arranged on straight lines.
Data Source
AI summary
An aggregation station: receives, from each of the base stations, communication path information with each of accommodated user terminals, for each user terminal; in a case where it is determined that the two of the base stations and the two user terminals are arranged on the straight line, generates first information for performing setting such that a transmission beam of any one of the base stations arranged on the straight line is stopped and another of the base stations non-orthogonally superimposes and multiplexes pieces of transmission data for the two respective user terminals with a predetermined power difference or power ratio; and controls the transmission beam of each of the two of the base stations arranged on the straight line on the basis of the first information.