Message Time-to-live based Drop Policy Under Spray and Hop Distance Routing

DTN developed to work on challenge networks such as space communcation with extreme distances where long latency on networks affected the conventional systems such as the internet is down. DTN could be employed as either network in the multiple island scenario where Ferry boat, car, and bus act as a DTN node. The scenario is adopted from Indonesia's condition, where some islands are small and remotely. Therefore DTN nodes have the mobility to reach the destination node, limited radio range and contact time, limited buffer storage that could be affected the congestion state in the network. We developed the remaining TTL node location drop policy (Drop by TTL) under Spray and Hop Distance Routing Protocol to tackle this problem. The simulation shows in the term of the total size of delivered messages, Drop by TTL overcomes the other drop policies when the size of delivered messages is 6553.6 MB. In terms of the overhead ratio, Drop by TTL consistently has the lowest overhead ratio compared to other drop policies except when the size of created messages is 1638.4 MB and achieved a lower average latency than the other drop policies when the size of created messages is 819.2 MB and 3276.8 MB. Although in the term of buffer time average, Drop by TTL achieved the highest buffer time average compare with the other drop policies.

I. Introduction

The lack of network communication on the remote islands contributed to many researchers worldwide proposed alternative networks; one of them is the Delay Tolerant Network (DTN). DTN developed to work on challenge networks such as space communication with extreme distances where long latency on networks affected the conventional networks such as the internet is down. The store-carry-forward paradigm in DTN could handle thus communication using node-to-node message transmission. DTN could operate using existing infrastructures such as Ferry boat, car, and bus as a DTN router to delivered messages from source to destination.