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A software-defined network based vertical handoff scheme for heterogeneous wireless networks

机译：用于异构无线网络的基于软件定义网络的垂直切换方案

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摘要

We propose a novel Quality of Service (QoS) vertical handoff scheme with the support of the Software-Defined Network (SDN) technique for the heterogeneous wireless networks. The proposed scheme solves two important issues of the vertical handoff: network selection and handoff timing. In this paper, the network selection is formulated as an 0-1 integer programming problem, which maximizes the overall QoS and avoids the network congestion. After the network selection process is finished, a mobile will wait for a time period for implementing the vertical handoff. The selected network should be consistently more appropriate than the current network during the time period, the mobile will transfer its inter-network connection to the selected network. Our proposed scheme ensures that, a mobile will transfer to the most appropriate network at the most appropriate time. Comprehensive simulation has been conducted. It is shown that the proposed scheme reduces the number of vertical handoffs, and maximizes the overall QoS significantly comparing with existing schemes.
机译：在异构无线网络的软件定义网络（SDN）技术的支持下，我们提出了一种新颖的服务质量（QoS）垂直切换方案。该方案解决了垂直切换的两个重要问题：网络选择和切换定时。本文将网络选择公式化为0-1整数规划问题，该问题最大程度地提高了整体QoS并避免了网络拥塞。在网络选择过程完成之后，移动台将等待一段时间以实现垂直切换。在该时间段内，所选网络应始终比当前网络更合适，移动台将把其网络间连接转移到所选网络。我们提出的方案可确保移动台将在最合适的时间转移到最合适的网络。进行了全面的模拟。结果表明，与现有方案相比，该方案减少了垂直切换的次数，并使整体QoS最大化。

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