No abstract

In this paper, we propose hybrid Vessel Monitoring System (VMS) design as alternative for current VMS scheme by collaborating internet connection and Disruption-Tolerant-Networks (DTN). The hybrid solution combines offline VMS that use radio networks and online VMS that utilizing satellite-based internet. Hybrid VMS aims to provide a more flexible VMS design and able to speed up delivery process of offline vessel’s data. The concept is both type of vessels must install a standard radio networks for data forwarding. The proposed method to speed up data delivery is by forwarding VMS data from one vessel to another using DTN forwarding scheme. Data can be forwarded to another offline vessel that will return to harbor earlier or to online vessels which have internet connection. Performance measurement is done through simulation analysis using ONE simulator. It aims to measure the speed up data delivery using hybrid VMS implementation compare to a pure offline VMS implementation. Simulation result show that hybrid VMS able to speed up data delivery for offline vessel data in 1.5 up to 2 times faster compare to a pure offline VMS implementation. Hybrid VMS also has advantages in flexible implementation by easily switching between online and offline VMS scheme, according to fisherman financial situation. Spray-and-Wait routing is the most suitable routing algorithm for hybrid VMS according to the efficiency ratio.

No abstract

No abstract

In archipelagic countries, vast maritime monitoring is a though problem. Non proportional comparison of sea patrols number to vast area of the sea is the main reason. This paper will investigate Delay-Tolerant-Networks prospect as communication backbone for fishery based surveillance system. Every fishing ships are capable to send text based report messages to sea patrols or chat message to another fishing ships by utilizing Delay-Tolerant-Networks. In the first step, it will evaluate the performance of DTN design, covering routing algorithms and network models in various node density. In the next step, the DTN prospect is investigated by analyzing scalability aspect. The simulation is done in Kepulauan Riau Province by using the one simulator. The result shows that the best DTN design is achieved by Epidemic Routing with Wimax network model. Its performance successfully deliver 91.22 % of the messages within 48 hour in average. This performance is sufficient for maritime application due to the slow speed of fishing ships and wide area of the sea. This fishery communication network can be scalable into larger area by utilizing DTN's convergence layer concept. By using secondary network which is installed in each region, DTN performance increase 30.94 % compare to single network interface solution. All in all, DTN's store & forward method and convergence layer concept are suitable for maritime conditions, especially for fishery communication network.Keywords-DTN design and prospect, fishery communication network, fishing ships density, vast maritime, convergence layer's speedup.