Research on Delay-Tolerant Network and Increasing Probability of Opportunistic Communication

At present, Internet has brought a lot of benefits to people. In most situations, it has an excellent performance. It requires a continuous end to end network for providing a reliable delivery. However, in reality, there is a challenged network which is discontinuous with high delay and many interruptions. In these cases, conventional network performs poorly or cannot be available. Delay-Tolerant Network (DTN) is an emerging area which is used to solve the problems in that challenged network. As its name described, it can handle or tolerant high delay which could lead to a disconnection that may be many hours or many days. It introduces a bundle protocol and uses a mechanism of store and forward to implement a hop to hop network which can operate in the discontinuous environment. It is used in terrestrial civilian networks, military wireless networks and outer space networks which have a high delay. The reference implementation has been developed by Delay-Tolerant Network Research Group (DTNRG). It implements a mature architecture of DTN and provides almost complete functions on Linux operating system. Later, the Bytewalla project implements part of DTN architecture and functions on Android operating systems. It is defective and there is much space to improve it. This research concerns that the Bluetooth convergence layer increases the probability of communication based on DTN.