WiMAX和WiFi垂直切换的无缝衔接

The Seamless Connection of the Vertical Handover between the WiMAX and WiFi

随着网络的发展,下一代无线网络将包括数个重叠的层次,为移动用户提供不间断的通信是一个具有挑战性的任务。在WiMAX和位于同一基站WiFi的情况下,垂直切换延迟将会减少与两个传统的WiMAX、WiFi网络的异构性。然而,协议转换仍然是增加延迟和抖动之间数据交换所需的两种技术。在该文中,为了减少在协议转换中的延迟,提出了一个新的工业设计,在WiMax和WiFi中添加适配层,对这两个标准间互通的实现进行了讨论和评价。结果表明,具有比其他相关工作更好的性能。

With the development of the network, the next generation of the wireless networks will consist of several overlapping tiers. Provision of undisrupted communication to mobile users is a challenging task. In the case of both the WiMAX and the WiFi technologies which are located at the same base station(BS), the vertical handover(VHO) delay will be less as compared with the two conventional WiMAX/WiFi heterogeneous networks with two different wireless Internet service providers. Nevertheless, protocol conversion is still adding delay and jitter for data exchange between the needed two technologies. In this paper, in order to reduce the delay in the protocol conversion, a new industrial design for WiWi(WiMAX and WiFi) adaptation layer is proposed. The realization of the interworking between these two standards is discussed and evaluated. The results show that the proposed scheme-with the scenario under study- has better performance than other related works.