Intercepting Optical Links for PIM Interference Detection
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Solution Overview
Problem
In wireless communication systems, passive intermodulation (PIM) and passive harmonic (PH) products caused by non-linear characteristics of passive components can lead to significant interference, reducing the carrier-to-interference ratio and affecting coverage, as these issues are difficult to manage and often require labor-intensive field engineering to identify and resolve.
Innovation Solution
A method and apparatus for intercepting optical links between baseband processing units and radio heads to detect and measure PIM products, determining their source, and generating indications for interference mitigation, including using a Site PIM/PH Manager to correlate and cancel interference in uplink data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field engineers manually track down and replace components causing PIM or PH interference, then interference can be eliminated, but the process becomes labor intensive and time consuming
Solution Approach 1:
The system enables self-diagnosis by automatically detecting and identifying PIM/PH interference sources without requiring manual field engineering. The base station performs autonomous monitoring of uplink signals, correlates interference patterns with downlink transmissions, and identifies problematic components, allowing the network to service itself rather than relying on external engineers for routine interference troubleshooting
Solution Approach 2:
The system implements continuous feedback monitoring by constantly analyzing uplink signals for PIM/PH products and comparing them against known downlink transmission patterns. This real-time feedback loop enables automatic detection of interference sources and triggers appropriate mitigation actions, creating a closed-loop system that continuously optimizes network performance without manual intervention
2Reliability
If comprehensive interference detection and cancellation is implemented, then network performance improves, but system complexity increases
Solution Approach 1:
The system achieves multi-functionality by combining interference detection, source identification, and cancellation capabilities within a unified base station architecture. The same signal processing resources used for normal uplink reception are leveraged to detect PIM/PH products, eliminating the need for separate dedicated detection equipment and reducing overall system complexity while maintaining comprehensive interference management
Solution Approach 2:
The system merges the interference detection and cancellation functions with existing base station operations. By integrating PIM/PH monitoring into the regular uplink signal processing chain and combining it with downlink transmission management, the system avoids creating separate complex subsystems and instead enhances existing infrastructure to perform multiple functions simultaneously
Data Source
AI summary
A method of processing interference received in a wireless network, the interference comprising a non-linear product of at least one downlink signal of the wireless network, is provided. The method includes intercepting a plurality of optical links, each optical link being between a respective baseband processing unit of a plurality of baseband processing units and a respective radio head of a plurality of radio heads, to provide a plurality of downlink and uplink data streams. The method includes detecting interference in an uplink data stream representing signals received at a first uplink carrier frequency caused by non-linear products of at least a signal at a first downlink carrier frequency represented by a downlink data stream. The method includes generating an indication comprising information relating to an uplink carrier frequency experiencing interference and at least one downlink carrier frequency causing interference.