Distributed Antenna Node Unit Automatic Abnormality Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In distributed antenna systems (DAS), it is challenging to detect and isolate abnormal remote units, especially when they are installed in hard-to-reach locations, as existing methods rely on physical access and manual spectrum analysis, making it difficult to identify and address issues such as digital overflow due to abnormal gain control, which can affect the entire system.
Innovation Solution
A node unit within the DAS that includes a signal input unit and a controller to analyze state information from other units, determine the state of uplink signals, and control signal transmission, allowing for automatic detection and isolation of abnormal remote units, using digital signal processors to combine normal and abnormal signals and adjust power levels based on weight information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual spectrum analysis is used to detect abnormalities in DAS, then the detection method is simple and equipment is easy to operate, but it becomes difficult to identify which specific unit has a problem when multiple units are involved, and impossible to detect units installed in hard-to-reach locations
Solution Approach 1:
The patent segments the DAS into multiple identifiable units (headend nodes, extension nodes, remote nodes) with unique identifiers. Each unit's state information is separately collected and analyzed, enabling precise identification of which specific unit has an abnormality rather than detecting only general system issues.
Solution Approach 2:
The patent implements a feedback mechanism where state information from each unit is continuously monitored and fed back to the controlling device. This enables real-time automatic detection and identification of abnormal units without requiring manual physical access or complex spectrum analysis, resolving the contradiction between detection precision and system complexity.
2Reliability
If automatic detection system is implemented to identify specific abnormal units, then the precision of abnormality identification is improved, but the system complexity and cost increase
Solution Approach 1:
The patent enables the DAS to perform self-diagnosis through automatic collection and analysis of state information from each unit. The system autonomously identifies abnormal units and their specific issues (such as digital overflow or gain control problems) without requiring external manual intervention or complex specialized detection equipment, thereby improving reliability while minimizing added complexity.
Solution Approach 2:
The controlling device performs multiple functions: collecting state information, analyzing abnormalities, identifying specific faulty units, and generating notifications. This multi-functional approach consolidates what would otherwise require separate specialized systems into a single integrated solution, improving reliability without proportionally increasing system complexity.
3Productivity
If all uplink signals are transmitted to the base station, then the signal coverage is maximized, but abnormal signals from faulty remote units can cause digital overflow and noise in the entire band affecting system performance
Solution Approach 1:
The patent implements preliminary action by analyzing state information from each remote unit before uplink signals are transmitted to the base station. The system proactively identifies abnormal units and prevents their signals from being transmitted, thereby avoiding digital overflow and noise contamination in advance rather than dealing with the problems after they occur.
Solution Approach 2:
The patent extracts and isolates abnormal signals from the overall uplink signal stream by identifying which remote units are faulty based on their state information. The system separates problematic signals from normal signals, allowing only clean signals to be transmitted to the base station, thus maintaining signal transmission efficiency while eliminating harmful noise and interference.
Data Source
AI summary
The present invention provides a distributed antenna system for automatically detecting an abnormally operating node unit. According to an embodiment of the present invention, a node unit of the distributed antenna system includes a signal input unit configured to receive and output first through n-th state information from n other node units connected to the node unit, where n is a natural number greater than or equal to 2; and a controller configured to analyze the first through n-th state information and to determine states of uplink signals respectively corresponding to the first through n-th state information. Each of the n other node units may analyze a signal received through a service antenna and generate the state information.