Vehicle Message Fragment Routing for Lower Convergence Time and Cost
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Solution Overview
Problem
Existing communication systems between vehicles and off-board systems face challenges in managing message transmissions across different channels with varying throughput, latency, and cost, leading to inefficient convergence times and costs due to the use of non-preferred communication channels when preferred channels become available.
Innovation Solution
Implementing an onboard electronic control unit in vehicles and an off-board system to manage message transmissions by detecting availability of preferred communication channels with better throughput, latency, and path loss ratios, and switching message fragments to these channels to reduce convergence time and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If messages are transmitted over satellite communication channels, then availability is improved in mid latitudes, but throughput is reduced and cost is increased
Solution Approach 1:
The system dynamically switches between satellite and cellular communication channels based on real-time availability and performance conditions. The message transmission strategy adapts the routing path by detecting which channel is currently available and selecting the optimal path for each message fragment, thereby resolving the contradiction between satellite availability and cellular throughput.
Solution Approach 2:
Messages are divided into multiple fragments that can be transmitted independently over different communication channels. This segmentation allows the system to send some fragments via satellite (when available) and others via cellular (when preferred), optimizing both availability and throughput by utilizing the strengths of each channel for different parts of the message.
2Reliability
If messages are segmented into smaller fragments, then transmission reliability is improved, but convergence time is increased
Solution Approach 1:
The system performs preliminary actions by detecting the availability of preferred communication channels before message transmission begins. When a preferred channel is detected, the system proactively routes message fragments through that channel rather than waiting for it to become available, thereby reducing convergence time while maintaining the reliability benefits of fragmentation.
Solution Approach 2:
The system continuously monitors communication channel conditions and uses this feedback to dynamically adjust message routing. By detecting when preferred channels become available and responding by switching message fragments to those channels, the system optimizes convergence time while preserving the reliability advantages of message segmentation.
3Loss of energy
If non-preferred communication channels are used, then convergence cost is reduced, but convergence time is increased
Solution Approach 1:
The system dynamically adjusts its communication strategy based on real-time channel conditions. When preferred channels are available, it utilizes them to reduce convergence time; when only non-preferred channels are available, it falls back to those to minimize convergence cost. This dynamic adaptation resolves the contradiction between cost and time by selecting the optimal trade-off at each moment.
Solution Approach 2:
The system changes the routing parameters of message transmission based on detected channel conditions. By monitoring parameters such as channel availability, throughput, and latency, the system adjusts the transmission parameters (route selection, fragmentation strategy) to optimize the balance between convergence cost and convergence time, resolving the contradiction through parameter adaptation.
Data Source
Figure 1(a)~1(d)
Figure 2(a)~2(c)
Figure 2(d)~2(f)
AI summary
The disclosure relates to a method, an onboard electronic control unit (111) in a vehicle (110) and an off-board system (120) for managing message transmissions between the vehicle (110) and off-board system (120). The method comprises communicating a first fragment (F1) of a message (170) between the vehicle (110) and the off-board system (120) via a first communication channel (Ch1) having a first throughput, a first transfer rate, a first latency, a first path loss ratio, and a first inter-packet delay variation. The method further comprises detecting, by the vehicle (110), availability of a second communication channel (Ch2) having at least one of a second throughput higher than the first throughput, a second transfer rate greater than the first transfer rate, a second latency less than the first latency, a second path loss ratio less than the first path loss ratio, or a second inter-packet delay variation less than the first inter-packet delay variation. The method further comprises communicating a second fragment (F2) of the message (170) between the vehicle (110) and the off-board system (120) via the second communication channel (Ch2).