One of the most recent topics in wireless communications is the heterogeneous networks. The next generation wireless networks are being designed with a convergence vision in which a mobile user/device can link simultaneously to various wireless access networks (e.g. WLAN, cellular, WMAN). Today when we talk about wireless heterogeneous networks, the first thing that comes to our mind is the seamless connectivity to the access networks. The users move continuously from one place to another while maintaining their connectivity to one or another network. During their movement from one place to another, the user switch among various access networks according to their needs like video streaming, an ongoing call and many others. This switching of user from one particular network to another one is known as Vertical Handoff. In the proposed work, we are introducing a new optimized vertical handoff algorithm for the seamless connectivity of the users to the wireless heterogeneous networks. The proposed algorithm provides better connectivity to the networks with reduced number of redundant handoffs. In the proposed work, all the simulations are done in NS3 simulation network by taking into consideration various parameters which are necessary for taking handoff decisions. Here, we are using the convex optimization technique with Gradient Descent algorithm for taking optimized Vertical Handoff Decision. The results obtained are then compared with the existing handoff algorithms and it is concluded that the proposed Handoff Algorithm outperforms the existing ones.

无线通信中的最新主题之一是异构网络。下一代无线网络的设计具有融合愿景，其中移动用户/设备可以同时链接到各种无线接入网络（例如. WLAN、蜂窝、WMAN）。今天，当我们谈论无线异构网络时，我们首先想到的是与接入网络的无缝连接。用户不断地从一个地方移动到另一个地方，同时保持与一个或另一个网络的连接。在他们从一个地方移动到另一个地方的过程中，用户会根据他们的需求在各种接入网络之间切换，比如视频流、正在进行的通话等等。这种用户从一个特定网络到另一个网络的切换称为垂直切换。在提议的工作中，我们引入了一种新的优化垂直切换算法，用于用户与无线异构网络的无缝连接。所提出的算法提供了更好的网络连接，减少了冗余切换的数量。在所提议的工作中，所有的模拟都是在 NS3 模拟网络中完成的，并考虑了做出切换决策所必需的各种参数。在这里，我们使用带有梯度下降算法的凸优化技术来进行优化的垂直切换决策。然后将获得的结果与现有的切换算法进行比较，得出的结论是，所提出的切换算法优于现有的切换算法。