VoIP is a rapidly growing technology that enables the transport of voice over data networks such as the public Internet. VoIP is becoming a viable alternative to the public switched telephone networks (PSTNs). In parallel, a dramatic increase is happening in the deployment of Wireless Local Areas Networks (WLAN) in buildings and corporate campuses. WLAN is, nowadays, mostly used for ordinary data services such as web browsing, file transfer and electronic mail. However, with the emerging usage VoIP telephony, WLAN are sought to be used as access infrastructure for enabling such applications. One of the issues of using VoIP over WLAN is the effects caused by users roaming within and between WLAN subnets during a VoIP session. The latency and the jitter are greatly impacted when the control of the mobile node is handed over from one access point (AP) over to another one. This poses a challenge to providing and preserving QoS for VoIP users in WLAN environments. In this paper, we propose to study and measure the effect of the hand-over for both intra and inter mobility for VoIP traffic.
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机译：VoIP是一种迅速增长的技术，可以使语音运输在诸如公共互联网之类的数据网络上。 VoIP正在成为公共交换电话网络（PSTNS）的可行替代方案。并行地，在建筑物和公司校园中部署无线本地区域网络（WLAN）中发生了戏剧性的增长。现在，WLAN是，主要用于Web浏览，文件传输和电子邮件等普通数据服务。但是，随着新兴使用的VoIP电话，WLAN被要求用作访问基础设施，以实现这些应用程序。使用VoIP over WLAN的一个问题是在VoIP会话期间漫游在WLAN子网内和WLAN子网内和之间的效果。当移动节点的控制从一个接入点（AP）到另一个接入点（AP）交付给另一个接入点（AP）时，延迟和抖动会很大影响。这对WLAN环境中的VoIP用户提供和保留了QoS的挑战。在本文中，我们建议研究和衡量移交的效果，用于VoIP流量的内部和移动性。
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