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Performance evaluation and analysis of different VoIP over WLAN mobility schemes is essential in order to meet adequate QoS levels in VoWLAN deployments. This paper presents a study of real time voice communication QoS in terms of delay, jitter, throughput and packet loss between three different Wireless Mesh Network mobility schemes in a crowded 802.11 environment. We also discuss the feasibility...
The use of wireless local area networks (WLANs), as well as the proliferation of the use of multimedia applications has grown fast in recent years. Some factors affect the quality of service(QoS) received by the user. The interference is an example. This work presents an empirical study of the QoS parameters of a VoIP application in the presence of an interference network, as well as the relevance...
Multi-homed Mobile nodes (MNs) are very likely to traverse several different WLANs at anytime and at any location during communication. Thus, a single voice over Internet protocol (VoIP) application can experience several handovers between WLANs, which the quality of the communication may be degraded due to packet loss. The handover scheme proposed in this paper employs the delay over WLAN as an indicator...
Multimedia applications have been the key driving force in converging fixed, mobile and IP networks. A major hurdle in the realisation of this convergence is obtaining Quality of Service from a heterogeneous, best-effort service network. Interactive voice requires strict bounds on delay, jitter and packet losses, video adds significant bandwidth requirements to the network, while Internet only makes...
With the emerging IEEE 802.11n standard, the WLAN is poised as a promising ubiquitous networking technology to support multimedia applications where providing QoS becomes imperative. However, the 802.11 WLAN is not designed to support delay sensitive traffic. This problem is magnified during a handover and typically results in excessive handover latency and packet loss. In addition, a 802.11 WLAN...
With the emerging IEEE 802.11n standard, the WLAN is poised as a promising ubiquitous networking technology to support multimedia applications where providing QoS becomes imperative. However, the 802.11 WLAN is not designed to support delay sensitive traffic. This problem is magnified during a handover and typically results in excessive handover latency and packet loss. In addition, a 802.11 WLAN...
Voice over IP (VoIP) over wireless mesh network (WMNs) has become a topic of great interest in both enterprise and research arena. The IEEE 802.11 standard is the most popular wireless LAN standard for extending the access point (AP) based network. However, it does not provide guaranteed quality for real-time applications such as VoIP. Besides, with the large number of injected flows in WMNs, only...
The convergence of different classes of traffic with different priorities over the wireless network has become a reality. To insure that the users of key applications such as VoIP are satisfied with the service they receive, one must insure that the QoS criteria for these applications, such as delay, jitter or packet loss, are met This in turn means that some form of connection admission control must...
Nowadays, it is very important to study the behavior of the wireless networks due to the variety of applications that make use of this technology. These applications frequently require a minimum QoS in order to work properly and guarantee a good service to the user. This paper aims to find a relationship between signal to noise ratio (SNR) and a 802.11g networkpsilas QoS in terms of latency, packet...
Delay, jitter and packet loss significantly degrade the speech quality in VoIP applications, especially in VoWLAN. In order to solve this problem, different jitter buffer and error concealment techniques are introduced. In this paper, we propose a new simple but effective error concealment method for VoIP, which uses the contour tendency of the last two packets to predict and recover the current packet...
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