المفاهيم الأساسية
Opportunistic DTN-aware protocols can maintain stable communication and high message delivery rates for trucks in challenging environments like Ya'an city's mountain roads, tunnels, and bridges.
الملخص
This paper investigates the feasibility and effectiveness of using opportunistic DTN vehicle communication compared to traditional GPS location tracking for trucks carrying express goods in the challenging environment of Ya'an city, which is surrounded by mountains, winding roads, and long tunnels.
The key highlights and insights are:
Ya'an city presents a highly challenging scenario for package tracking due to the prevalence of mountain roads, tunnels, and bridges that disrupt conventional GPS-based tracking.
The paper designs a realistic Ya'an scenario in the ONE simulator, incorporating heterogeneous nodes (trucks, pedestrians, cars, cargo ships, and base stations) with varying mobility patterns and communication capabilities.
Experiments are conducted to analyze the performance of three DTN routing protocols - Epidemic, Spray and Wait, and MaxProp - in the Ya'an scenario across metrics like delivery rate, overhead rate, and average delay.
The results show that the Spray and Wait protocol exhibits stronger adaptability to the Ya'an scenario, maintaining high delivery rates while sacrificing around 10% in average delay compared to the other protocols, and having a much lower overhead rate.
Spray and Wait's performance is less sensitive to changes in the number of nodes in the scenario, indicating its ability to work more stably in complex and dynamic environments.
The paper also investigates the impact of the initial number of message copies ('L' value) on the Spray and Wait protocol's performance, finding that a value of 20 provides a good balance between average delay and overhead rate.
Overall, the paper demonstrates the feasibility of using opportunistic DTN-based communication to overcome the challenges of GPS-based tracking in mountainous environments like Ya'an city, and identifies the Spray and Wait protocol as a promising solution for reliable package tracking in such scenarios.
الإحصائيات
The growth rate of China's online retail transaction volume was more than 35% every year from 2012 to 2016, and even reached 50% in 2014.
In 2016, the number of parcels delivered by China's express delivery reached 31.28 billion and maintained an annual growth rate of more than 50%.
The average walking speed of an adult is about 3 miles per hour.
The speed limit for trucks on highways and tunnels in Ya'an is 45 miles per hour, and the urban speed limit for small vehicles is 18 mph.
The average speed of freighters on the Yuxi River is about 15 miles per hour.
اقتباسات
"The current stage of courier tracking is not ideal in challenging environments such as mountain roads, tunnels and city centres."
"Emerging research has shown that GPS signals are often blocked by high-rise buildings which leads to the vehicle losing its position when it travels in challenged areas such central areas of cities (which are often congested), as well as tunnels or mountain roads (which may be isolated)."
"The fault and disconnection aware smart sensing (FDASS) framework aims to reduce the load on the network, by detecting and avoiding connections to faulty nodes in the network and directing traffic to nodes that are more reliable and less congested."