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首页> 外文期刊>International journal of ad hoc and ubiquitous computing >Enabling delay-tolerant communications for partially connected vehicular ad hoc networks
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Enabling delay-tolerant communications for partially connected vehicular ad hoc networks

机译：为部分连接的车辆自组织网络启用延迟容忍通信

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摘要

The packet delivery ratio and throughput in Vehicular Ad Hoc Networks (VANETs) depend on the network connectivity and degrade as the connectivity decreases. A delay-tolerant approach increases the packet delivery ratio in partially connected networks. In the previous studies, the packet lifetime and the vehicle's packet carry time are determined to maximise the packet delivery ratio in partially connected VANETs. However, IPv6 uses the hop count in the Hop Limit field instead of using seconds in the TTL field, as in IPv4. Similarly, although IPv4 packets are designed to carry the packet lifetime in seconds in the TTL field, this field is used for the hop count in practice. In this case, there is no mechanism to determine how long vehicles will carry packets in VANETs when delivering packets in a delay-tolerant fashion. In this study, we propose approaches for the delivery of IPv6 packets in a delay-tolerant fashion in partially connected networks. We also propose another method that enhances these proposed approaches and optimises the packet delivery ratio. Our analysis shows that the proposed approaches can be easily adopted for IPv6/IPv4 packets to be delivered in a delay-tolerant fashion. Additionally, we observe that our approaches increase the packet delivery ratio in partially connected VANETs and can also be used in networks where the nodes are mobile or connections get broken frequently.
机译：车载自组织网络（VANET）中的数据包传递率和吞吐量取决于网络连接性，并且随着连接性降低而降低。延迟容忍方法可提高部分连接的网络中的数据包传输率。在以前的研究中，确定数据包寿命和车辆的数据包携带时间以最大化部分连接的VANET中的数据包传输率。但是，IPv6在“跳数限制”字段中使用跳数，而不是像在IPv4中那样在TTL字段中使用秒。类似地，尽管IPv4数据包旨在在TTL字段中以秒为单位携带数据包寿命，但实际上该字段用于跃点计数。在这种情况下，没有机制可以确定在以延迟容忍的方式传递数据包时，车辆将在VANET中承载数据包多长时间。在这项研究中，我们提出了在部分连接的网络中以延迟容忍的方式传递IPv6数据包的方法。我们还提出了另一种方法，可以增强这些方法并优化数据包的传输率。我们的分析表明，提出的方法可以很容易地采用IPv6 / IPv4数据包以延迟容忍的方式传递。此外，我们观察到，我们的方法提高了部分连接的VANET中的数据包传递率，并且还可以用于节点移动或连接频繁断开的网络中。

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