CDMA MANET Power Adaptation With Neighbor Interference Limits
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Solution Overview
Problem
In CDMA MANETs, sudden increases in power transmission by nodes can cause significant interference, leading to link losses for other nodes, necessitating a method to adapt power transmission without undue interference.
Innovation Solution
A method that identifies one-hop neighbor nodes and calculates the maximum permissible power increase for each, limiting interference by using signal-to-noise ratio feedback to determine a controlled power change value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a node increases its transmit power to improve data rate or extend connection range, then the node's transmission capability is improved, but interference to other nodes increases causing link losses
Solution Approach 1:
The system performs preliminary identification of one-hop neighbor nodes before power increase, and calculates threshold maximum changes in interference for each neighbor in advance. This preliminary action allows the node to know the safe power increase limits before actually increasing power, preventing interference-induced link losses.
Solution Approach 2:
The system uses feedback from neighbor nodes about their current power levels and interference thresholds to determine the maximum permissible power increase. The local node receives feedback information from neighbors and adjusts its power increase accordingly, ensuring that the power increase does not exceed what neighbors can tolerate.
2Productivity
If a node increases power transmission to handle sudden data queue increase, then data transmission capability is improved, but network stability deteriorates due to interference
Solution Approach 1:
Before increasing power to handle data queue increases, the system preliminarily identifies neighbor nodes and calculates their interference thresholds. This ensures that even when power must be increased for productivity, the increase is bounded by pre-calculated values that preserve network stability.
Solution Approach 2:
The system changes the transmit power parameter in a controlled manner by calculating specific power change values based on neighbor interference thresholds. Instead of arbitrary power increases, the power parameter is adjusted by precise amounts that maintain network reliability while improving data transmission capability.
3Adaptability or versatility
If a node makes a connection with a distant node by increasing power, then connection capability is improved, but interference to existing links increases
Solution Approach 1:
The system performs preliminary identification of all one-hop neighbor nodes and calculation of their interference thresholds before attempting to connect with distant nodes. This preliminary action establishes the maximum power increase that can be applied without harming existing links, enabling safe extension of connection range.
Solution Approach 2:
The system adjusts the transmit power parameter to a specific value that extends connection range while staying within interference thresholds of existing neighbors. The power parameter is precisely controlled based on calculated values that balance new connection capability with protection of existing links.
Data Source
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AI summary
Determining maximum transmit power by a local node. A method includes identifying one-hop neighbor nodes of the local node in the mesh network. One or more threshold maximum changes in interference caused by the local node increasing its transmit power for each of the one-hop neighbor nodes of the local node are identified. A plurality of power change values are identified. Each power change value in the plurality of power change values corresponds to a power change at the local node that would cause one of the threshold maximum changes in interference to occur at a corresponding one-hop neighbor node of the local node. A lowest power change value from among the plurality of power change values is identified. As a result, power transmitted by the local node is increased, while limiting an increase in power transmitted by the local node to no more than the lowest power change value.