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Use of contact duration for message forwarding in intermittently connected mobile networks

机译：使用联系持续时间在间歇连接的移动网络中进行消息转发

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摘要

Several routing schemes have been proposed for intermittently connected mobile networks. In these schemes, a node carries a message and forwards the message to another node when they meet. To increase the delivery success rate and reduce the message delivery delay, the node to forward the message is selected based on such criteria as the probability that the node is likely to meet the destination. However, even if a node is suitable under such criteria, the contact duration may be too short to complete the message forwarding, which is called 'forwarding failure' in this paper. The risk of forwarding failure due to link disconnection during transmission has been mostly ignored in the existing routing schemes. In this paper we focus on avoiding forwarding failure. To this end, a large message is divided into smaller fragments, and we present a mathematical model to derive the optimal fragment size that minimizes message delivery delay. We then present a runtime algorithm which determines whether a current message fragment should be forwarded to a node encountered. Contact duration with the candidate node is estimated for this decision. Delayed forwarding and transmission power adjustment is incorporated into this algorithm to enhance energy efficiency of message forwarding. The benefits and feasibility of the proposed scheme are extensively evaluated by simulations and experiments.
机译：对于间歇性连接的移动网络，已经提出了几种路由选择方案。在这些方案中，节点携带一条消息，并在遇到它们时将消息转发给另一个节点。为了增加传递成功率并减少消息传递延迟，基于诸如节点可能满足目的地的概率之类的标准来选择转发消息的节点。但是，即使在这样的条件下一个节点合适，联系持续时间也可能太短而无法完成消息转发，在本文中称为“转发失败”。在现有的路由方案中，由于传输过程中链路断开而导致转发失败的风险已被忽略。在本文中，我们着重于避免转发失败。为此，将一条大邮件分成较小的片段，我们提供了一个数学模型来得出最佳的片段大小，该片段可以最大程度地减少邮件传递延迟。然后，我们提出一种运行时算法，该算法确定是否应将当前消息片段转发到遇到的节点。为此决策估计与候选节点的联系持续时间。延迟转发和传输功率调整被合并到该算法中，以提高消息转发的能效。通过仿真和实验对所提方案的好处和可行性进行了广泛的评估。

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