On-Demand Parameter Exchange for LLN Dwell Time Compliance
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Solution Overview
Problem
Low Power and Lossy Networks (LLNs) face challenges such as lossy links, low bandwidth, and regulatory compliance limitations that lead to unwanted delays in data transmission, particularly in large-scale networks with multiple communication interfaces, where coordinating channel-hopping schedules between devices is complex and often results in dwell time limit violations.
Innovation Solution
The use of multiple network interfaces allows for the determination and communication of transmission parameters, such as channel selection and modulation, to ensure compliance with dwell time limits, enabling efficient data transmission by utilizing a second interface to provide parameters necessary for communication on a first interface, thereby avoiding dwell time violations and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel-hopping schedules are coordinated between devices in LLNs, then regulatory compliance is maintained, but transmission delays increase due to dwell time limitations
Solution Approach 1:
The invention obtains transmission parameters (channel, data rate, modulation) in advance through a request-response mechanism before actual data transmission. This preliminary acquisition of parameters allows the transmitting device to immediately begin data transmission without waiting for channel availability or encountering dwell time limitations, thus maintaining regulatory compliance while reducing transmission delays.
2Adaptability or versatility
If multiple network interfaces are used for communication, then channel diversity and capacity increase, but device complexity increases
Solution Approach 1:
The invention introduces a parameter request message as an intermediary mechanism that facilitates coordination between transmitting and receiving devices. This message exchange serves as a mediator that enables the receiving device to provide necessary transmission parameters to the transmitting device, allowing efficient utilization of multiple network interfaces while managing device complexity through standardized communication protocols.
3Productivity
If transmission parameters are determined on-demand, then transmission efficiency improves, but coordination complexity between devices increases
Solution Approach 1:
The invention segments the parameter acquisition process into distinct phases: a transmitting device sends a parameter request message, a receiving device processes and responds with transmission parameters, and then data transmission occurs. This segmentation of the coordination process into discrete, manageable steps reduces overall coordination complexity while maintaining high transmission efficiency through on-demand parameter determination.
Data Source
AI summary
In a multi-PHY, low power and lossy network comprising a plurality of nodes, a sender determines that a dwell time threshold limit for transmission of data will be exceeded by transmission of the data over a first network interface or that the recipient is unknown. The sender determines transmission parameters for the transmission of the data over the first network interface and transmits the transmission parameters to a receiver device over a second network interface that is different than the first network interface. The sender determines a channel on the first network interface for transmission of the data and transmits the determined channel with the transmission parameters to the receiver, or the receiver determines the channel on the first network interface for transmission of the data and transmits an indication of the determined channel to the sender in response to receiving the transmission parameters.