Multi-Topology Routing in Low Power Lossy Networks
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Solution Overview
Problem
Low Power and Lossy Networks (LLNs) face challenges such as lossy links, low bandwidth, battery operation, low memory, and processing constraints, which affect data transmission efficiency and reliability, especially in dense networks like Smart Grids and Smart Cities, where traditional routing protocols are not suitable due to high loss rates and instability.
Innovation Solution
The implementation of a multi-interface network architecture that dynamically switches between medium and low transmission power channels using channel-hopping schedules, allowing devices to adapt transmission power based on link quality and traffic demands, thereby optimizing channel utilization and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices use fixed transmission power channels, then channel-hopping schedule is simple, but data transmission reliability is poor in dense LLN
Solution Approach 1:
The patent implements dynamic channel switching by allowing devices to transition between medium-power and low-power channels based on real-time link quality assessment. The channel-hopping schedule is no longer fixed but adapts dynamically to network conditions, with devices monitoring signal strength and packet loss to determine optimal channels for data transmission.
Solution Approach 2:
The patent changes the transmission power parameter dynamically by switching between medium and low power modes. This parameter change allows the system to optimize between transmission range and energy consumption, with devices selecting appropriate power levels based on distance to gateway and current network conditions.
2Length of moving object
If devices transmit using medium power, then transmission range is extended, but energy consumption increases
Solution Approach 1:
The system dynamically adjusts transmission power based on actual communication needs. Devices close to the gateway use low-power channels to conserve energy, while devices at the network edge switch to medium-power channels when medium range is required, creating a dynamic power distribution across the network.
Solution Approach 2:
Different parts of the network use different transmission power levels appropriate to their local conditions. The patent creates local optimization where each device selects the minimum necessary power level for successful communication, rather than using uniform high power throughout the network.
3Quantity of substance
If LLN uses high density of nodes, then network coverage is improved, but link loss rate increases
Solution Approach 1:
The patent segments the network into multiple channels with different power levels. By dividing the communication spectrum into medium-power and low-power channels, the system reduces interference and collision probability in dense deployments, allowing more nodes to coexist with acceptable link reliability.
Solution Approach 2:
The system implements periodic channel switching and power level changes in the channel-hopping schedule. This periodic action distributes traffic across multiple time slots and channels, reducing simultaneous transmissions and lowering the effective link loss rate in dense networks.
Data Source
AI summary
In a multiple interface, low power and lossy network comprising a plurality of nodes, a low transmission power and medium transmission power topology are defined for the network and a channel-hopping schedule is defined for the devices operating in each topology. A sender determines that data is capable of being transmitted via a link on the low transmission power topology. The sender determines the transmission parameters for the transmission of the data over the link on the low transmission power topology and determines a low transmission power channel for transmission of the data. The sender transmits the determined channel and the transmission parameters to the receiver. The sender transmits the data via the determined channel in the low transmission power topology.