5G Access Node Power Control for Radar Altimeter Coexistence
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Solution Overview
Problem
The deployment of 5G wireless networks in the C-band frequency range causes interference with radar altimeters used in aircraft and helicopters, posing safety risks due to the proximity of frequency bands and potential hazardous interference.
Innovation Solution
A system that determines the location and signal strength of radar altimeters relative to 5G access nodes, adjusts transmitter power output and antenna arrays to maintain signal strength within safe thresholds, thereby creating a protection area around the access nodes to minimize interference and ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 5G access nodes transmit at high power to provide faster communications and additional resources, then service quality and speed are improved, but interference with radar altimeters increases creating safety risks
Solution Approach 1:
The system dynamically adjusts the transmit power parameter of 5G access nodes based on the location and status of radar altimeters. When a radar altimeter is detected within a protected area, the access node reduces its transmit power to below a threshold level, thereby eliminating harmful interference while maintaining normal service quality for mobile users outside the protected zone.
Solution Approach 2:
The system implements a feedback mechanism where location information about radar altimeters is continuously monitored and fed back to the 5G access nodes. This feedback enables real-time adjustment of transmission parameters to prevent interference while maintaining optimal service for legitimate users.
2Area of stationary object
If 5G networks expand in C-band frequency to provide enhanced services, then network coverage and capacity are improved, but co-existence with radar altimeter frequency band (4.2-4.4 GHz) becomes problematic due to proximity
Solution Approach 1:
The system applies different transmission characteristics to different spatial regions. A protected area is defined around locations where radar altimeters operate, and within this local zone, the 5G access nodes use reduced power levels. Outside this local zone, normal high-power transmission continues, thus maintaining extensive network coverage while protecting radar altimeter operations in the affected local area.
3Object-affected harmful factors
If transmitter power output is reduced to prevent radar altimeter interference, then interference is minimized, but signal strength for 5G users may be degraded
Solution Approach 1:
The power reduction is applied locally only within the protected area surrounding radar altimeter operations. The system maintains full transmit power for 5G users outside this localized zone, ensuring that signal strength and service quality are preserved for the majority of the network coverage area while only affecting the small local region where radar altimeters are present.
Data Source
AI summary
Systems and methods are provided for 5G and aircraft altimeter radar co-existence that provides optimum and more accurate protection radius and optimum wireless access node (gNodeB) power setting level for safe interference levels. The strength of a signal from a wireless access node at the location of the radar altimeter is determined. The strength of the signal at the location of the radar altimeter is compared to a threshold to determine if the threshold is satisfied. In response to the strength of the signal satisfying the threshold, one or more parameters for the signal, including transmitter power level, are changed.