Mesh Network Power-Rate Control for Aircraft Attitude Changes
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Solution Overview
Problem
Existing power and rate control algorithms in mesh networks fail to compensate rapidly changing antenna gain patterns due to sudden changes in aircraft attitude, leading to potential link loss and increased CDMA interference.
Innovation Solution
Implement a proactive power and rate control process that uses platform attitude orientation measurements to boost link SNR margin by increasing target SNR for forward data and adjusting power or rate at remote nodes, while diminishing measured SNR feedback to compensate for attitude changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmit power is increased to compensate for rapid antenna gain changes, then communication link reliability is improved, but CDMA interference increases and network capacity decreases
Solution Approach 1:
The system performs preliminary action by proactively increasing the target SNR margin before rapid antenna gain changes occur. The transmitter node anticipates potential link degradation due to platform attitude changes and pre-adjusts power and rate parameters, eliminating the need for reactive power increases that would cause excessive interference.
Solution Approach 2:
The system implements dynamic power and rate control that adapts to changing channel conditions in real-time. By continuously monitoring SNR feedback and adjusting parameters dynamically, the system maintains reliable communication without requiring sustained high power transmission, thereby reducing overall CDMA interference.
2Object-affected harmful factors
If transmit power is limited to maintain low probability of interception and detection, then security is improved, but ability to compensate for antenna gain losses deteriorates
Solution Approach 1:
The system changes parameters by adjusting both power and rate simultaneously rather than relying solely on power increases. By modifying the rate parameter alongside power adjustments, the system can maintain effective communication during antenna gain changes while keeping transmit power levels low, thus preserving security characteristics.
Solution Approach 2:
The system performs preliminary action by pre-increasing the target SNR margin before antenna gain changes occur. This allows the receiver to maintain reliable communication during rapid attitude changes without requiring the transmitter to use excessive power, thereby preserving low probability of interception and detection.
3Speed
If feedback messages are transmitted at high rate to quickly convey SNR information, then power and rate control responsiveness is improved, but network bandwidth consumption increases
Solution Approach 1:
The system implements feedback by having receiver nodes send SNR measurements back to transmitter nodes, enabling closed-loop power and rate control. This feedback mechanism allows the system to respond to channel changes efficiently without requiring excessive feedback bandwidth, as the feedback is used specifically for control parameter adjustment rather than general data transmission.
4Measurement precision
If power and rate control decisions are made based on feedback latency, then control accuracy is improved, but responsiveness to rapid attitude changes deteriorates
Solution Approach 1:
The system performs preliminary action by proactively increasing the target SNR margin before rapid antenna gain changes occur. This predictive approach allows the system to maintain control accuracy without being constrained by feedback latency, as the adjustment is made in anticipation of channel degradation rather than in response to delayed feedback.
Solution Approach 2:
The system implements dynamic control that adapts to the rate of attitude changes. By continuously monitoring channel conditions and adjusting power and rate parameters in real-time, the system maintains both control accuracy and responsiveness, overcoming the limitation of fixed feedback latency.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Compensating for antenna gain losses due to attitude changes of a mobile local node in a network. A method includes at the local node, identifying an attitude change of the local node. As a result of identifying the attitude change of the local node, the method includes increasing a target SNR of forward data directed to one or more remote nodes by a boost value. As a result of identifying the attitude change of the local node, the method includes causing the remote node to adjust at least one of power or rate to compensate for the attitude change for subsequent reverse data sent from the remote node to the local node.