Pocket Switched Network (PSN) is a branch of Delay Tolerant Network (DTN) which is intended to work in a challenged network. Challenged network is network with lack of infrastructure such as disaster area. As such, the network has intermittent connectivity. PSN provides a new paradigm to distribute messages in the network by taking advantage of roaming nodes from one place to another. In this paper, network performances of eight PSN routing protocols are investigated namely, First Contact, Direct Delivery, Epidemic, PRotocol using History of Encounter and Transitivity (PRoPHET), Spray and Wait, Binary Spray and Wait, Fuzzy Spray, Adaptive Fuzzy Spray and Wait. The performance metrics are packet delivery ratio, overhead ratio and average latency. Opportunistic Network Environment (ONE) simulator is used to evaluate the network performance. Experiments show that Epidemic has the best performance in term of message delivery ratio, but it has the highest overhead ratio. Direct Delivery has the lowest overhead ratio (zero overhead ratio) and PRoPHET has the lowest latency average.
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机译：袖珍交换网络（PSN）是延迟耐受网络（DTN）的一个分支，旨在在受挑战的网络中工作。受到挑战的网络是缺乏灾区等基础设施的网络。这样，网络具有间歇性连接。 PSN通过利用漫游节点从一处到另一处的优势，提供了一种在网络中分发消息的新范例。本文研究了8种PSN路由协议的网络性能，即首次接触，直接传递，流行，使用接触和传递历史（PRoPHET）的PRotocol，喷涂和等待，二进制喷涂和等待，模糊喷涂，自适应模糊喷涂和等待。性能指标是数据包传输率，开销率和平均延迟。机会网络环境（ONE）模拟器用于评估网络性能。实验表明，Epidemic在消息传递率方面具有最佳性能，但其开销率却最高。 Direct Delivery的开销比率最低（零开销比率），而PRoPHET的平均延迟最低。
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